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Title:
BLADE OSCILLATION DAMPER OF A SAWING DEVICE AND A SAWING DEVICE USING THE SAME
Document Type and Number:
WIPO Patent Application WO/2022/229514
Kind Code:
A1
Abstract:
In the present disclosure of embodiments, a method to manufacture a damper of a sawing device has been disclosed. In the manufacturing (100), a blank of a damper (3) of a sawing device (SD, CS) of a harvester (H) is used, wherein manufacturing such a blank of the damper comprises method steps: providing (101) a mold for the dimensions of the damper of the sawing device (SD, CS), providing (102) a composition comprising sawdust wood, plastics, rubber or a mixture of thereof as the main material, filling (103) the mold by a composition comprising the main material, compressing (104) the composition comprising the main material in the mold, to form a solid piece as a blank of a damper (3), removing (105) the compression-made solid piece from the mold, and dedicating (106) a surface to the blank of the damper (3) for finalization of the damper (3) from said blank of the damper (3) for the saw blade (Bl) made groove by the sawing device (SD, CS) of the harvester device (H) after the mount of the damper to the sawing device's cover (1). According to the present disclosure, alternative mechanical and/or magnetic damper arrangements are embodied for the damping operation.

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Inventors:
ROMPPANEN MARKO (FI)
RONKAINEN MIKA ANTERO (FI)
MÖNKKÖNEN MARKKU TAPIO (FI)
Application Number:
PCT/FI2022/050283
Publication Date:
November 03, 2022
Filing Date:
April 29, 2022
Export Citation:
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Assignee:
HARVESTER WORKS STAFFING OY (FI)
International Classes:
A01G23/083; A01G23/091; B27B17/00; B27N3/08
Foreign References:
US4117594A1978-10-03
US4334358A1982-06-15
US4356884A1982-11-02
Attorney, Agent or Firm:
HEINONEN & CO, ATTORNEYS-AT-LAW (FI)
Download PDF:
Claims:
CLAIMS

1. A method to manufacture (100) a blank of a damper (3) of a sawing device (SD, CS) of a harvester (H), comprising the following method steps:

- providing (101) a mold for the dimensions of the damper of the sawing device (SD, CS),

- providing (102) a composition comprising sawdust wood, plastics, rubber or a mixture of thereof as the main material,

- filling (103) the mold by a composition comprising the main material,

- compressing (104) the composition comprising the main material in the mold, to form a solid piece as a blank of a damper (3),

- removing (105) the compression-made solid piece from the mold, and

- dedicating (106) a surface to the blank of the damper (3) for finalization of the damper (3) from said blank of the damper (3) for the saw blade (Bl) made groove by the sawing device (SD, CS) of the harvester device (H) after the mount of the damper to the sawing device’s cover (1).

2. The method of claim 1, further comprising mounting (107) the blank of the damper (3) to the sawing device’s (SD, CS) cover (1) to the mounting location.

3. The method of claim 2, further comprising sawing (108) a groove, to the blank of the damper (3) for the saw blade guide bar being supported sideways, by the sawing device (SD, CS) of the harvester device (H) after the mount of the blank of the damper (3) to the sawing device’s (SD, CS) cover (1).

4. The method of claim 1, 2 or 3, comprising adding (103a) to said composition comprising the main material at least one of the following constituents:

- a binder constituent, - a fire retardant, and

- a lubricant constituent to lubricate the chain of the sawing device when m use.

5. The method according to anyone of the previous claims, comprising adding (103b) an authentication agent to mark the origin of the manufacturer of the blank of the damper (3).

6. A blank of a damper (3) of a sawing device of a mobile harvester device, characterized in that, the blank of the damper (3) of the sawing device is manufactured according to anyone of the claims 1 to 5.

7. A damper (3) of a sawing device comprising a mechanical damper arrangement with a mechanical damper (3s), an electro-magnetic damper arrangement with an ensemble of electromagnetic dampers, comprising at least one electromagnetic damper (3ml), (3 m2, (3 m3) and/or a damper (3) being made from the blank of the damper (3) according to claim 6.

8. The damper (3) of a sawing device according to claim 7, comprising a groove for the saw blade guide bar for sideways support in contact to contact surface to the guide bar of the saw blade near the guide bar tip to hold the guide bar in the groove of the damper.

9. The damper (3) of a sawing device according to the claim 7 or 8, wherein the damper has a sideways support in contact contacting the saw blade guide bar to hold an electromagnet at the position of damping a vibration mode by the magnetic field of said electromagnet.

10. The damper (3) of a sawing device of claim 8 or 9, wherein the damper (3) is adapted to in contact to the guide bar at the pruning position of the guide bar of the saw blade of the sawing device, but out of the contact at the cutting position of the guide bar of the sawing device.

11. The damper (3) of the sawing device (SD, CS) of claim 8 or 10, wherein the damper (3) has a mounting location at the cover (1) of the sawing device, to facilitate pivoting the saw blade so that when the saw blade being pivoted between a cutting position and a pruning position, the damper (3) being in contact with the guide bar sides at the pruning position.

12. The damper (3) of the sawing device (SD, CS) according to anyone of the claims 8 to 11, characterized in that the contact surface has a dimension to extend by an extension portion to the point of contact (P) of the chain of the sawing device (SD, CS) contacting to the wood being intended to be processed when pruning, so that the extension portion extends at least to the bearing region of the tip of the guide bar of the saw blade to bear the chain of the sawing device (SD, CS) on its guide bar. 13. The damper of a sawing device (SD, CS) according to anyone of the claims

8 to 12, characterized in that the extension part extends symmetrically to opposite directions from the point of contact to damp at least the first harmonic vibration frequency of the guide bar.

14. A sawing device of a harvester device comprising a damper (3) of a sawing device (SD, CS) according to anyone of the claims 7 to 13.

15. A harvester device comprising a damper (3) of a sawing device (SD, CS) according to anyone of the claims 8 to 13 in the sawing device (SD, CS) of the harvester (H).

Description:
BLADE OSCILLATION DAMPER OF A SAWING DEVICE AND A SAWING DEVICE USING THE SAME

FIELD OF THE INVENTION

In general, embodiments of the outstanding invention in the present disclosure relate to a harvesting machine being used in harvesting wood. In more specifically, the embodiments of the invention relate to a sawing device and a damper therein as indicated in an independent claim directed to a damper of a sawing device. Embodiments of the invention concern also such a sawing device that uses such a damper of the sawing device according to an independent claim directed to such a sawing device. In addition, embodiments of the invention concern also a mobile wood harvester device that uses such an embodied damper of the sawing device in the sawing device of the harvester device, according to an independent claim direct to such a mobile harvester device. Embodiments of the invention also concern a method to manufacture such a blank of the damper of the sawing device in accordance of an independent claim directed to the manufacturing method of an embodied blank of the damper of a sawing device.

BACKGROUND

In a mechanical logging procedure trees are processed with a harvester. Processing refers to the application, pruning and cutting of wood into quantity-sizable parts, in which case the felling and the cuttings are carried out by using a chain-saw device. Such a chain-saw device is used in a mobile harvester device, that is capable to move in forest by its own motion, the energy for the motion being produced traditionally by a combustion engine motor of the harvester, as well as basically the energy converted and transferred in suitable way, for the cutting and collecting the wood in accordance to the processing in the forest.

During such processing, the saw device of the harvester is moved along the wood trunk of fallen tree at high speed, with the saw blade at a pruning position, causing the saw blade to vibrate at the movement state changes the saw blade to vibrate, along its longitudinal axis. The vibration in the saw blade, comprising a guide bar of the saw blade and the chain thereon, at the beginning of the sawing, causes a dimensional deviation, or sawing event to fail in the wood, as well as a lateral load on the saw chain and the chain path of the guide bar, leading to premature abrasion out of use. Lubricant also is consumed because of the contacts under the abrasive load of the chain and the guide bar, as the lubricant is about to decompose, displace and/or bum, leaving the contact point without lubrication, which has to be restored by adding lubricant to the chain path on the guide bar. This is as the loading of the guide bar and saw chain causes premature wear and dissenting from the damper groove, which in turn can lead to their damage being unusable.

The dimensional deviation or failure of the sawing will have to be corrected with a new sawing, causing some of the wood to be wasted in the traditional harvesting.

The vibration problem has been acknowledged as such for long among the harvester operators of the chain saw equipped modern harvesters. As the increased power of the harvesters and the capabilities to operate, it is also influenced to the saw blade vibrations. The traditional solutions to solve such vibrations has being relying on the saw blade material, form as well as the stmcture of the saw blade.

SUMMARY OF THE INVENTION

The objective is to at least alleviate the problems described hereinabove not satisfactorily solved by the known arrangements, and to provide a feasible solution to the vibration problem, without abrading unnecessarily by the loading the guide bar and/or the chain of the saw blade, by a simple and light weighted versatile stmcture implemented by embodiments of the invention in the present disclosure.

The aforesaid objective is achieved by the embodiments of a blade oscillation damper, also called as a damper for brevity, and a blank of the damper manufactured by a method in accordance with the present invention.

The aforesaid objective(s) are achieved according to the embodiments of the present invention as claimed in the independent claims. According to the embodiments of the present disclosure, a saw blade comprises a guide bar and the saw chain as such. The guide bar comprises also the path for the saw chain, i.e. a groove, recess or a channel on the guide bar along which the saw chain is intended to move when the chain saw of the sawing device is moving. The guide bar can comprise also the lubrication channels, bearings as well as potential sprocket wheels in the tip for the movement of the saw chain. The saw blade is comprised by an embodied sawing device. Such a sawing device is comprised in the harvester head of an embodied harvester device.

In the disclosure of embodiments, an expression “blank” is used to denote to a preform, that can be finalized by a dedicated operation. That is to say, especially in connection to an embodied blank of the damper, the dedicated operation comprises making the final groove to the blank of the damper for the saw blade, by the sawing device into which the blank of the damper is about to be mounted and be used.

According to an embodiment of the present disclosure, a method to manufacture a blank of a damper of a sawing device of a harvester device comprises the following method steps:

- providing a mold for the dimensions of the damper of the sawing device,

- providing a composition comprising sawdust material,

- filling the mold by a composition comprising sawdust, plastics, rubber, wood or a composition of thereof as main material,

- compressing the composition comprising sawdust material in the mold, to form a solid piece as a blank of a damper,

- removing the compression-made solid piece from the mold, and

- dedicating a surface to the blank of the damper for finalization of the damper from said blank of the damper for the saw blade made groove by the sawing device of the harvester device after the mount of the damper to the sawing device’s cover.

Because of the manufacturing in the particular way as embodied, the materials solves the problem to avoid abrasions of the saw blade and the chain, when the blank of the damper and its finalized form as the embodied damper is used in the sawing device.

According to an embodiment of the present disclosure, the blank of a damper is a preform of an embodied damper of the sawing device, i.e. it is manufactured by preform molding by pressing, from a composition comprising main material, such as for example sawdust, plastics, rubber, wood or a composition of thereof. Such a blank of the damper is dedicated at the finalizing phase to the sawing device by making the groove for the saw blade by such, to the blank of the damper, i.e. the preform of the damper, so to provide the damper with the groove, supporting the saw blade at the guide bar, on both sides during processing of the trunks when pruning the saw blade in the pruning position.

However, it is possible to embody as a variant of the embodiment the blank of the damper with a pre-cut guide bar groove being made for a certain type of specific sawing device using a certain saw blade and the guide bar therein. It is to be noted, that final dedication to the particular sawing device is to be made when mount to the sawing device for its use with such a damper.

According to an embodiment of the present disclosure, the embodied method can comprise mounting the blank of the damper to the sawing device’s cover to the mounting location on the sawing device’s cover, according to an embodiment variant, on to a surface of the concave side, i.e. inside side in said sawing device’s cover.

According to an embodiment of the present disclosure, the embodied method can comprise sawing a groove, to the blank of the damper for the saw blade guide bar being supported sideways, by the sawing device of the harvester device after the mount of the blank of the damper to the sawing device’s cover.

According to an embodiment of the present disclosure, the embodied method can comprise adding to said composition comprising sawdust at least one of the following constituents:

- a binder constituent, - a fire retardant, and

- a lubricant constituent to lubricate the chain of the sawing device when in use.

According to an embodiment of the present disclosure, the embodied method can comprise adding an authentication agent to mark the origin of the manufacturer of the blank of the damper.

According to an embodiment the blank of the damper can be manufactured from a non-abrasive main material, such as sawdust, optionally from such main materials as rubber, plastic or a composition thereof. According to an embodiment variant, the composition can be made also so that at least one of the main materials is in its own phase. In such embodiments it is possible to adjust for example rubber made damper parts by pressure to change the shape, when there were a pressure increased in the cross-wise direction in respect to the support direction, i.e. pressure increase in a parallel direction of the plane of the saw blade across the saw blade surface, causing the rubber to deform the damper’s shape so that the distance to the saw blade can be decreased, even during the operation of the sawing device. According to an embodiment variant, the pitch between the saw blade guide bar and the damper can be made automatically adjusted/set, so that during the use and the consequent abrasion of the damper, the pitch can be kept in the correct value, by adjusting the pressure over the damper/blank of the damper.

According to an embodiment of the present disclosure, an embodied blank of the damper of a sawing device of a mobile harvester device has being manufactured according to an embodied method of the present disclosure.

According to an embodiment of the present disclosure an embodied damper of a sawing device is made from the blank of the damper according to an embodiment of the present disclosure. Such a damper can be made by mounting to the sawing device’s cover and dedicating the blank of the damper to the sawing device by making the groove by the sawing device so to provide the damper as an embodied damper. According to an embodiment of the present disclosure, an embodied damper of a sawing device of a mobile harvester device comprises a groove for the saw blade guide bar for sideways support in contact to contact surface to the guide bar of the saw blade near the guide bar tip to hold the guide bar in the groove of the damper.

According to an embodiment of the present disclosure, an embodied damper of a sawing device of a mobile harvester device comprises the damper being adapted to be in contact to the guide bar at the pruning position of the guide bar, but out of the contact at the cut position of the guide bar of the sawing device. According to an embodiment, the positions referring to prune and to cut as respective pruning position and cut or cutting position refer to the position of the saw blade of the sawing device. Accordingly, the sawing device has being considered to have the corresponding states/positions in regard to the positions of the saw blade. It is also the harvester being embodied to have its saw blade in the corresponding states/positions to cut and to prune as its operational states or operational modes.

According to an embodiment of the present disclosure, the embodied sawing device has a pivotable chain saw blade, so to provide two operational positions for the sawing device, as its saw blade being in the cutting position when applied to the tree cutting position and in the pruning position when applied to the fallen tree to prune the trunk for removal of the branches and/or the stumps, for example.

According to an embodiment of the present disclosure, an embodied damper of a sawing device of a mobile harvester device comprises the damper that has a mounting location at the cover of the sawing device, to facilitate pivoting the saw blade so that when the saw blade being pivoted between a cutting position and a pruning position, the damper being in contact with the guide bar at the pruning position.

According to an embodiment of the invention, it is also possible to provide an embodied sawing device with a mounting lid on the sawing device’s cover, to make it more quick to assemble the blank of the damper or to re-assemble the used damper to the operation location in correct position to damp/prevent the saw blade vibrations.

According to an embodiment of the present disclosure, an embodied damper of a sawing device of a mobile harvester device comprises such a contact surface that has a dimension to extend by an extension portion to the point of contact of the chain of the sawing device contacting to the wood being intended to be processed when pruning, so that the extension portion extends at least to the bearing region of the tip to conduct the chain on the guide bar of the saw blade and to bear the chain of the sawing device on the guide bar. The bearing region is referring to the tip of the saw blade irrespective, is the bearing being implemented by a simple glide bearing, rotating wheel bearings or sprocket wheels.

According to an embodiment of the present disclosure, an embodied damper of a sawing device of a mobile harvester device comprises such an extension part that extends symmetrically to opposite directions from the point of contact to damp at least the first harmonic vibration frequency of the guide bar.

According to an alternative embodiment of the present disclosure, a blank of a damper can be embodied by replacing it by an alternative mechanical damper arrangement, to mechanically support as supporting the saw blade, at the pruning position, the support being supporting at a position on the blade corresponding the vibration amplitude maximum of the vibration of the base mode, being considered as the first harmonic mode of the vibration. The support can be in contact to the blade at the support point to provide the support in the prune mode, and release the contact in the cut mode of the saw blade. The mechanical damper arrangement can be embodied as attached to the sawing devise’s cover, according to a further variant by a shock-absorbing material to avoid transference of vibrations from the sawing blade cover and its hosting device to the sawing blade itself. The support can be embodied as mechanical latch or locking shafts to be operated according to the mechanics switching between the pruning mode and the cutting mode. Alternatively, the support can be embodied by using solenoids to push and/or pull the supporting pieces as based on the magnetic interaction when the solenoid is electrically energized. According to an embodiment variant, the mechanical damper arrangement can comprise an adjustment means to adjust the position to contact the blade without contact to the sawing chain, so to adjust the contacting point position at least at the maximum vibration amplitude of a certain mode of the vibration, said vibration being selected among the base mode as the first harmonic, second harmonic, third harmonic and fourth harmonic. According to an embodiment variant, the saw blade can comprise solid magnets at the positions corresponding the amplitude maxima of the vibration modes of the base mode and/or higher harmonics.

Such magnets can also collect magnetic materials from the saw blade, so extending the operational use of the saw until it should be sharpened or changed because of abrasion.

According to a further alternative embodiment of the present disclosure, a blank of a damper or the mechanical damper arrangement can be replaced by an electro magnetic damper arrangement according to an embodied of the present disclosure. According to an embodiment of such an alternative embodiment, the electro magnetic damper arrangement comprises at least one magnet in the arrangement as an electrically operated magnet. According to an embodiment variant such magnet operation can push or pull a support piece towards the saw blade and against it, or when sufficiently strong as based on magnetic field to damp the vibration.

According to an embodiment, such a magnet is distant to the sawing blade, in a non-contact manner, so being without direct contact to the saw blade, but said electric magnet is positioned to a position in which the maximum of the magnetic field correspond the position at the saw blade corresponding to the position on the saw blade at the vibration amplitude maximum of the vibration at the first harmonic mode of the vibration, as being considered as the base mode.

The support of the electric magnet can be in contact to the saw blade cover at the corresponding attachment point, so that the electro-magnetic damper arrangement can be embodied as being attached to the saw devise’s cover, according to a further variant by a shock-absorbing material to avoid transference of vibrations from the sawing blade cover and its hosting device to the sawing blade itself via the magnetic interaction to the saw blade.

According to an embodiment variant, the electromagnetic damper arrangement can comprise an adjustment means to adjust the position to cast the magnetic field interaction to the saw blade without mechanical contact to the sawing chain, so to adjust the damping point position at least at the maximum vibration amplitude of a certain mode of the vibration, said vibration being selected among the base mode as the first harmonic, second harmonic, third harmonic and fourth harmonic. According to an embodiment variant electro-magnetic damper arrangement can comprise an ensemble of electric magnets, to be positioned to cast their magnetic interaction corresponding the positions on the saw blade with the amplitude maxima of the harmonic vibrations, wherein the said vibration is selected to include at least one among the base mode as the first harmonic, second harmonic, third harmonic and fourth harmonic. According to an embodiment variant, at least one of the magnets is/are connected to the electric signal to produce the magnetic field in certain sequence corresponding the vibration frequency but phased to damp the vibration. According to an embodiment variant a number of electric magnets in the electro-magnetic damper arrangement are positioned to a dedicated position to cast their magnetic field to positions on the saw blade corresponding the position of the maximum amplitude of a certain harmonic vibration mode to be damped by the magnetic field pulsating with the same dedicated frequency but phased to damp the vibration at the associated dedicated frequency, when the magnets are operated by electric signals to constitute the magnetic fields for the damping.

According to an embodiment variant, the electric magnets can be provided both sides of the saw blade. A skilled person in the filed knows from the embodiments of the present disclosure of the invention that within the electro-magnetic damper arrangement embodiments the blade has a magnetic position at the locations where the damping is being directed. This can be embodied by magnetic blade material, but alternatively magnetic material tablets to provide spots attached to the saw blade for the magnetic interaction.

Although the optimum position on the saw blade for the damping were at the maximum amplitude of a vibration mode, especially when concerning the base mode and the saw blade tip as in a free position, in practical reasons the maximum amplitude can be considered as an effective maximum amplitude and the corresponding position on the saw blade, especially when the saw blade tip being considered to maintain its operation as free. In such a case the effective maximum amplitude corresponding position, especially to the base mode, can be considered at a position of a higher harmonic maximum amplitude, or a position between such position and the saw blade tip.

A skilled person knows from the embodiments, that the vibration frequencies, the base mode as the first harmonic as well as the higher harmonics are determined by the saw blade geometry, especially the length of the saw blade.

According to an embodiment variant, the embodiments can be used in combination with each other in suitable part in the damping, especially in optimizing the saw blade lifting and return as well as other sawing related desired movements in respect of energy efficiency and/or abrasion of the saw blade.

A sawing device of a harvester device according to an embodiment of the present disclosure comprises an embodied damper of a sawing device of a mobile harvester device manufactured from an embodied blank of the damper, said blank of the damper being manufactured according to an embodiment of the present disclosure.

A harvester device according to an embodiment of the present disclosure comprises a sawing device of a harvester device according to an embodiment of the present disclosure that comprises an embodied damper of a sawing device of a mobile harvester device manufactured from an embodied blank of the damper, said blank of the damper being manufactured according to an embodiment of the present disclosure. According to an alternative embodiment of the present disclosure, mechanical damper arrangement as well as electro-magnetic damper arrangement can be used with an embodied sawing device of a harvester device being embodied.

The utility of the present invention follows from a plurality of factors depending on each particular embodiment.

The spare part expenses are considered smaller than in the traditional solutions. It is also considered that the embodiments makes the service duration shorter, but also diminishes the number of operational failures. In addition, the embodiments would make the wholeness to operate more effectively, as less waiting in the service and unnecessary movements can be minimized so to increase the working efficiency of a harvester device that uses a sawing device with the embodied damper.

It is also considered that the prevention of the vibrations of the saw blade influences to the lubrication and fuel economy of the sawing device, as the sideways contact of the chain to its channel when run diminishes, as the vibrations are not taking part of the power from the blade. Non-vibrating sawing device also makes the yield of the wood increased, and also misplaced sawing points can be also avoided.

The dedication by each of the sawing device individuals confirms that the damper has a compatible groove with the sawing device for the optimum support, with the optimized support by the damper for the saw blade at the guide bar, during the use of the sawing device in the wood processing while on the move. The vibrations are prevented, as they do not even begin, as the saw blade is supported at the guide bar at the contact point.

The expression “a number of’ refers herein to any positive integer starting from one (1), e.g. to one, two, or three.

The expression “a plurality of’ refers herein to any positive integer starting from two (2), e.g. to two, three, or four.

The expression “to comprise” has been used as an open expression. Different examples on embodiments of the present disclosure of embodiments of the invention are disclosed in the dependent claims.

BRIEF DESCRIPTION OF THE RELATED DRAWINGS

Next the invention is described in more detail with reference to the appended drawings illustrating examples of embodiments of the present disclosure, in which

Fig. 1 illustrates an example of an embodiment of a manufacturing method of a blank of the damper in accordance with the present disclosure of the embodiments of invention, as combinable to one or more embodiments,

Fig. la illustrates an example of an embodiment of a manufacturing method of the damper in accordance with the present disclosure of the embodiments of invention, as combinable to one or more embodiments,

Fig 2 and 2a illustrate examples of embodied dampers, in accordance with the present disclosure of the embodiments of invention, as combinable to one or more embodiments,

Fig. 3 illustrates a cross-section example of an embodied sawing device using an embodied damper, in accordance with the present disclosure of the embodiments of invention, as combinable to one or more embodiments,

Fig 3B illustrates an alternative example of an embodiment of the present disclosure with an alternative mechanical damper arrangement to damp saw blade vibrations, as combinable to one or more embodiments,

Fig 3C illustrates an alternative example of an embodiment of the present disclosure with an alternative electromagnetic damper arrangement to damp saw blade vibrations, as combinable to one or more embodiments,

Fig 3D illustrates generation of damping signal to control damping by electromagnetic arrangement as embodied.

Fig. 4 illustrates an embodied sawing device without embodied damper being mounted, in accordance with the present disclosure of the embodiments of invention, as combinable to one or more embodiments, Fig 4a and 4b illustrate mechanical vibration modes of a saw blade as such,

Fig 5 illustrates an embodied sawing device of Fig 4 example with an embodied damper, in accordance with the present disclosure of the embodiments of invention, as combinable to one or more embodiments, Fig 6 illustrates an embodied harvester device with an embodied sawing device exemplified in Figs 3 and 5, in accordance with the present disclosure of the embodiments of invention, as combinable to one or more embodiments, and

Fig 7 illustrates an embodied harvester device in operation to prune a fallen tree trunk, in accordance with the present disclosure of the embodiments of invention, as combinable to one or more embodiments.

DETAILED DESCRIPTION OF THE EMBODIMENTS

In Fig 1, an example of an embodied manufacturing method (100) of the blank of a damper (3) has been illustrated. The method steps as such are exemplified in the shown order, however, a skilled person knows that at least some of the method steps can be overlapping and/or being parallel in timeline, in suitable part.

The shown example about an embodied method to manufacture (100) a blank of a damper (3) of a sawing device of a harvester, comprises the following method steps:

- providing (101) a mold for the dimensions of the damper of the sawing device,

- providing (102) a composition comprising sawdust material,

- filling (103) the mold by a composition comprising sawdust, wood, plastics, rubber or a mixture of thereof as the main material,

- compressing (104) the composition comprising sawdust material in the mold, to form a solid piece as a blank of a damper (3),

- removing (105) the compression-made solid piece from the mold, and

- dedicating (106) a surface to the blank of the damper (3) for finalization of the damper (3) from said blank of the damper (3) for the saw blade made groove by the sawing device of the harvester device after the mount of the damper to the sawing device’s cover.

According to an embodiment, with reference to Fig la, the method 100 further comprises such a step of mounting 107 the blank of the damper 3 to the sawing device’s cover to the mounting location and making by sawing 108 the dedicated operation to make the groove for the saw blade to the desired deepness into the damper piece material.

According to such an embodiment, with reference to Fig la, the method 100 further comprises such sawing 108 a groove (cf. Figs 2 and 2a) , to the blank of the damper (3) for the saw blade guide bar being supported from sideway directions, by the sawing device of the harvester device, after the mount of the blank of the damper 3 to the sawing device’s cover. According to an embodiment the mounting position on the cover (i.e. as 1 in Fig 3) of the blank of the damper 3 as well as the dedicated damper 3 can be positioned to correspond a location to match between the tip of the saw blade and its half way, but according to a further variant the blank of the damper or the blank can extend even over the half way of the saw blade towards the motor part M of the sawing device. An embodiment variant that is further comprising the method steps 107 and 108 in addition to those of method 100, has been denoted by the reference numeral 111.

According to an embodiment variant, the method (100, 111 )can comprise adding 103a to said composition comprising the main material at least one of the following constituents: a binder constituent, a fire retardant, and a lubricant constituent to lubricate the chain of the sawing device when in use.

In such embodiment variants the binder can be a suitable epoxy or alike, a glue, an elastic material or similar to bind the main material particles/granule together to form the blank of the damper 3. The fire retardant can be of such material that comprises an extinguishing gas releasing material when heated, and/or suitable inflammable material to prevent a fire, such as suitable boron compound. The lubricant can be such that when the saw blade is about to heat in the use of sawing device, the lubricant is released from the damper material, and flows as a thin film to the chain for the lubrication.

The release can be based on a viscosity change of the lubricant material in the temperature of operation but can also have a restricted time of effect in such use as long as the material is available in the damper material matrix. According to an embodiment variant, such lubricant can be restored as a refill, provided that the damper is still utilizable condition for the purpose, i.e. not abraded out of the operation to support.

According to an embodiment the method can comprise adding 103b an authentication agent, tag, to mark the origin of the manufacturer of the blank of the damper 3. Such a tag can be strictly composed composition of chemicals in certain proportion of known compounds and hidden compounds, which together mark the blank of the damper 3 material to the manufacturer’s origin. Such materials can have a certain composition and/or can have optical polarization properties in optical verification, as well as the tag can emit fluorescent light in suitable conditions, to find out if the tag or its suitable component is present in the damper material. In Fig 1 the method step has been illustrated with reference numerals 103a and 103b with dashed line, the dashing illustrating certain optionality to add materials to the blank of the damper constituting composition.

Fig 2 and 2a illustrate examples of blank of the damper 3 having formulated to respective forms of a disk or cylinder and rectangular prism. The markings 201 are indicative of attachment position examples to attach the blank of the damper to the sawing device’s cover (1, Fig 3, 4 and 5). Although indicated to be positioned to the side parallel to the groove for the saw blade, a skilled person knows from the shown embodiments, that for example the opposing side of the groove can be provided with the attachments with corresponding position in the cover.

The dashed line with marking Groove illustrates a groove position for the saw blade, as made in advance before the mount to the sawing device and/or position where the chain saw would make the individual dedicated location of the groove in the damper 3.

Fig 3 illustrates an embodied sawing device (SD), utilizing chain saw (CS) set up. In Fig 3 there is also a damper 3 indicated at the saw blade B1 base position, which is also the position to prune the trees after the fell, and /or in standing. The cover of the sawing device SD has been indicated by marking 1 , to protect the chain saw chain and its teeth Ch (as illustrated in the insert).

In Fig 3 the saw blade B1 has been indicated to comprise also the chain on the fand of the saw blade. The symbol M illustrates mechanism that is used to make the chain to rotate on the guide bar, in the chain path. The motor M can be electric motor, combustion engine operated or a hydraulic or pneumatic. In such embodiment variants the needed energy for the operation can be provided by the power source of the harvester to which the sawing device is belonging in use. The dashed line of the 1 is indicative that the view is to the inside parts.

In Fig 3 there is a sawing device cover (1) being disclosed with an embodied damper (3). The damper (3) can be mounted to the cover (1) according to the present disclosure so that the at the base position, in which the saw blade is also in the pruning position according to an embodiment, the saw blade (Bl) is at least partly inside the damper (3), in a groove in the damper (3).

According to an embodiment, the damper (3) has been manufactured from a compressed material, in which there is used sawdust, plastics, rubber, wood or a composition thereof as a main material constituent of the damper(3). According to an embodiment the damper (3), as being manufactured by compression of a composition comprising the main material, the damper (3) is provided by a groove for the saw blade for the support in sideways. According to an embodiment, the groove has a deepness into the damper -piece material to correspond at least half of the width of the saw blade, in direction that is defined by the plane between the opposite sides of the chain on the saw blade. According to an embodiment the groove is made by a cut by the sawing device after the mounting of the damper into the cover of the sawing device. According to an embodiment, making the groove finalizes the manufacturing of the damper (3), so dedicating the damper to the specific sawing device that made the groove, corresponding the base state of the saw blade simultaneously in the pruning position. According to an embodiment variant the damper has been made to such a shape that it is symmetric, so that the groove can be re -produced, to use the same piece of the damper, but in a different position, however to fit to the same mounting location on the inside side of the sawing device’s cover.

According to an embodiment the sawing device can have two states: to prune position and to cut position. Transfer from one position to another can be made by pivoting, under control of the hosting harvester device. In the cut position the sawing device is used in falling the trees as well as cutting them to pieces of trunks. The same saw blade of the sawing device can be used in the pruning the trunks, when trees standing, or as fallen. A skilled person knows from the embodiments that an access to the damper 3 is available in the exemplified embodiment from downwards to up (according to the markings of the Fig 3), or via an optional embodiment embodied with a dedicated lid for the damper 3 service.

Fig 4 illustrates vibration of the saw blade B1 of the sawing device SD with an arbitrary amplitude A at the saw blade tip, when the chain saw touches the wooden trunk Log at the position P, to move left and right in the notation of the Fig 4.

In Fig 4 the sawing device is without the damper 3, and the saw blade can vibrate with the maximum vibration amplitude A at the tip of the saw blade doe

Fig 5 illustrates a similar sawing device in same situation as in Fig 4, embodied with the damper 3, that prevents the vibration to occur

Fig 4a illustrates mechanical vibration modes of the saw blade’s as a mode of vibration with half a wavelength (l/2) to equal the length of the saw blade L and such a mode of vibration that quarter of a wavelength (l/4) to equal the length of the saw blade L, when for example, the sawing device being suddenly accelerated and/or decelerated, in a pruning-free operation, corresponding cases in which the saw blade tip is secured (L equals l/2) and the saw blade tip is free (L equals l/2). The vibration amplitude A is on an arbitrary axis of amplitude quantity, the amplitude being highly exaggerated for illustrative purposes, in comparison to the schematic dimensions of the saw blade.

Considering the potential situation of Fig 4, when before touching the wood at point P, saw blade (i.e. supported at the motor end M, not yet touching the wood), and comparing to the situation in Fig 5 with the embodied damper 3 in its place, in the latter case the vibrations according to the example of Fig 4a are to being effectively damped/prevented in Fig 5 set up.

Fig 4b illustrates mechanical vibration modes of the saw blade’s as modes of vibration with half a wavelength (l/2) to equal the length of the saw blade L and such a mode of vibration that has a wavelength (l) to equal the length of the saw blade L, when for example, the sawing device being in contact with the wood Log at the point P, in the example at approximate position of half of the saw blade, the operation of the saw blade being accelerated and/or decelerated when moving on the Log, but in a non-free operation, because of the contact to point P, moving along the tree trunk Log. The vibration amplitude A is on an arbitrary axis of amplitude quantity, the amplitude being highly exaggerated in comparison to the dimensions of the saw blade. The dashed wave symbol is indicative of damped vibration at the side from the point P to motor M side of the saw blade, because of the non- free situation by touching the log when moving along the surface.

Considering the potential situations of Fig 4 and Fig 5, when free saw blade (i.e. supported at the motor end M, touching the wood at the point P on the saw blade, which moves along the Log surface for pruning), and comparing to the situation in Fig 5 with the embodied damper 3, in the latter case the vibrations according to the example of Fig 4b are also to be effectively damped/prevented in Fig 5 set up. In Fig 5 there is also shown such an embodiment variant of the damper 3 by the dashed line illustrated extension to extend over the contact point P, towards the motor comprising part M. In regard to the Figs 4a and 4b, also other higher harmonics can be present, but the amplitudes od such may be insignificant to contribute to the vibrations and their amplitudes. Anyhow, it is the damper 3 that can be used to prevent the vibrations to develop and sum, as indicated by the Fig 5 in comparison to Fig 4.

Figure 6 illustrates schematically an embodied harvester device as such that has a sawing devise in the harvester head HH, that is using an embodied sawing device in processing wood in logging, by cutting the trunks of the trees to suitable length logs as well as pruning the trunks before their cutting into such pieces.

Figs 4, and 4a illustrate saw blade vibrations, when the saw blade is about to land on the point of contact P on the wooden log, i.e. for the pruning, and so to move along the trunk surface, the vibrations being prevented in the embodied harvester device H (having a harvester head HH) of Fig 6 in the sawing device comprising the damper 3 as shown as an example by the damper 3 as embodied in Fig 3, Fig 3B, Fig 3C with reference to Fig 3D, and FIG 5.

Fig 7 illustrates an embodied harvester with an embodied sawing device with the embodied damper, made according to the embodied manufacturing process. Fig 7 also illustrates the use of the damper 3 in a harvester device’s harvester head and therein in the sawing device, to prevent the vibrations of the saw blade by the damper being embodied in the present disclosure.

Example 1

According to the present disclosure, an embodied harvester device is using an embodied sawing device that has a saw blade vibration control system based on a blank damper according to an embodiment of the present disclosure. Such a damper based on blank damper has been positioned on the saw blade to such a position of the length of the saw blade, so that the position is at the effective amplitude maximum position, near the free tip of the saw blade.

The saw blade with the chain is used in cutting trees as well as pruning. The saw blade has corresponding positions in use in the sawing device (Figs 3-5), a pruning position and cutting position. In the cutting position the saw blade is free, except at the operating end at the sawing device motor (M). In the pruning position there is a support 3, a damper 3, as based on a blank damper, with the groove to support the saw blade and so to damp the vibrations of the saw blade B1 (Figs 3-5), being effected by the positioning of the support of the damper (3) to a position near the saw blade tip. The position of the damper on the saw blade is selected to correspond a mechanical vibration base mode (being considered as a first harmonic frequency mode of the harmonic frequencies of the blade vibrations) in respect of the amplitude maximum associated position on the saw blade. According to a variant there is also another such support/damper 3 being attached to the next harmonic frequency maximum amplitude occurrence position on the blade, to further damp the vibrations in the pruning position. According to an embodiment variant, also the summing of the harmonic modes of the vibrations may result a different position than the mere base mode or its next harmonic. Consequently, the summing by superpositioning the harmonic modes may indicate an effective position that differ from the one which would be based on the mere base mode or its next following harmonic.

Example 2

Fig 3B illustrates an alternative example of an embodiment of the present disclosure with an alternative mechanical damper arrangement to damp saw blade vibrations, as combinable to one or more embodiments. According to an embodiment of the invention, in the embodied mechanical damper arrangement comprises the dampers 3s as well as the mechanical shafts g with their connections and joints and supports, but also the mechanical means to relay to the dampers 3s their movements via the mechanical shafts g in control of the mechanics that switches the sawing device’ saw blade between the prune position and cutting position.

According to an alternative embodiment of the present disclosure, with reference to Fig 3B, such a damper that is based on a blank of a damper as such as embodied, can be alternatively embodied by replacing such damper 3 by an alternative mechanical damper, in a damper arrangement with dampers 3s and their guides g to switch between the pruning position (To prune position) and cutting position (To cut position), to mechanically support as supporting pieces 3s as dampers at the saw blade, at the pruning position. The dampers 3s of the arrangement being supporting at a position on the blade Bl, at the position corresponding the vibration amplitude maximum of the vibration of the base mode, being considered as the first harmonic mode of the vibration.

The dampers 3s can be in contact to the blade at the support point as illustrated in Fig 3B, to provide the support in the pruning mode, and release the support/contact in the cut mode of the saw blade Bl. According to an embodiment the dampers 3s with the contacting pieces c as indicated in Fig 3B can provide a thumb-first finger grasp to the sawing blade to make sure that the saw chain is not touching to the damper or its parts during switching from pruning position (corresponding the sawing device’s pruning state) to cutting position (corresponding the sawing device’s cutting state) or vice versa. According to an embodiment the contacting pieces c can be embodied as made by vibration damping materials as such. According to a further variant, they can be arranged to roll at their position to the dampers 3s, so to smoothen the switching from one position to another.

The mechanical damper arrangement can be embodied as attached to the sawing devise’s cover (the cover as such not shown in Fig, but as indicated in Fig 3). according to a further variant the support/damper can be provided with contacting pieces c being made of a shock-absorbing material to avoid transference of vibrations from the sawing blade cover and its hosting device to the sawing blade itself. In Fig 3b the material is illustrated by black dots c at the supports 3 s on the side towards the blade Bl.

The dampers 3s in the mechanical damper arrangement can be embodied with mechanical latch or locking shafts as guides g to be operated according to the mechanics switching between the positions of pruning mode and the cutting mode, the switching being triggered via the state change between the positions of pruning and cutting in a mechanical way, in a guidance of the sawing device’s saw blade position control with the mechanical means. Alternatively, the dampers 3s can be embodied by using magnetic material pieces c and solenoids 3 s to surround such. According to an embodiment variant, in the place of the items 3s in Fig 3B, in such variant to push and/or pull the supporting pieces c as dampers (for this embodiment illustrated by the black dots c in the Fig 3B) as based on the magnetic interaction when the solenoid is electrically energized and the supporting pieces comprise a part of a magnetic material to interact with the magnetic field of the solenoids when electrically energized. As relating to this embodiment, the items g illustrate also the power lines for feeding the operational energy for the solenoids to move the magnetic materials comprising dampers c in this embodiment variant, the control being taken via guidance of the sawing device’s saw blade position control and its electrical control.

According to an embodiment variant, the mechanical damper arrangement as embodied in Fig 3B can comprise an adjustment means to adjust the position to contact the blade (without contact to the sawing chain) along the length of the blade (i.e. in horizontal direction left to right and vice versa), so to adjust the contacting point position at least at the maximum vibration amplitude of a certain mode of the vibration, said vibration being selected among the base mode as the first harmonic, second harmonic, third harmonic and fourth harmonic.

According to the example 2 in question, the magnetic field can be static field achieved by DC-current to be used to provide magnetic field to hold the support/damper 3s against the blade at the pruning position, but according to an embodiment variant, the operational logic can be so arranged, that the magnetic field is used to open the support/damping at the cutting position duration events. There between the magnetic field is switch off in this embodiment variant so to provide a force to hold the damper pieces 3s against the blade by springs for example, against to which the magnetic field opens the support/damping for the cutting position.

According to an embodiment variant, the saw blade can comprise solid magnets at the positions corresponding the amplitude maxima of the vibration modes of the base mode and/or higher harmonics. So, the user can be guided to set the dampers to the corresponding points and/or make adjustment for the best results of damping.

Such magnets can also collect magnetic particulate materials detached from the saw blade, so extending the operational use of the saw until it should be sharpened or changed because of abrasion.

Example 3

With reference to Fig 3C, it illustrates an alternative example of an embodiment of the present disclosure with an alternative electromagnetic damper arrangement to damp saw blade vibrations, as combinable to one or more embodiments, According to a further alternative embodiment of the present disclosure, a blank of a damper or the mechanical damper arrangement can be replaced by an electro magnetic damper arrangement embodied according to an embodiment of the present disclosure.

According to an embodiment of such an alternative embodiment, the electro magnetic damper arrangement comprises at least one magnet in the arrangement as an electrically operated magnet. According to an embodiment variant such magnet in operation can push or pull a support piece towards the saw blade and against it, or when sufficiently strong magnetic fields are produced as based on magnetic field to damp the vibration of the saw blade, being made of magnetic material, or having magnetic material buttons/tablets on the saw blade at the positions corresponding the damping positions at the locations of the vibration mode specific maxima of the saw blade, at the prune position.

According to an embodiment variant associated to Example 3, as well as to Figs 3C and 3D, instead of DC-current (as in variant of Example 2 with the solenoid 3s, and contacting pieces c (Fig 3B)), AC current would be possible to be used, provided that the supporting pieces as dampers can preserve the support to the blade B1 for the damping function of the vibration. According to an embodiment variant associated to the Figs 3C and 3D, illustrating magnetic damper arrangement comprising therein at least one magnet (3ml, 3m2, 3m3) that is distant to the sawing blade Bl, in a non-contact manner, so being without direct contact to the saw blade, but said electric magnet (3ml, 3m2, 3m3) is positioned to a position in which the maximum of the magnetic field maximum correspond the position at the saw blade corresponding to the position on the saw blade at the vibration amplitude maximum of the vibration at the first harmonic mode of the vibration, as being considered as the base mode.

The support of the electric magnet(s) can be in contact to the saw blade cover at the corresponding attachment point, so that the electro-magnetic damper arrangement can be embodied as being attached to the saw devise’s cover, according to a further variant by a shock-absorbing material to avoid transference of vibrations from the sawing blade cover and its hosting device to the sawing blade itself via the magnetic interaction to the saw blade.

According to an embodiment variant, the electromagnetic damper arrangement can comprise an adjustment means to adjust the position to cast the magnetic field interaction to the saw blade without mechanical contact to the sawing chain, so to adjust the damping point position at least at the maximum vibration amplitude of a certain mode of the vibration, said vibration being selected among the base mode as the first harmonic, second harmonic, third harmonic and fourth harmonic. According to an embodiment variant electro-magnetic damper arrangement can comprise an ensemble of electric magnets, to be positioned to cast their magnetic interaction corresponding the positions on the saw blade with the amplitude maxima of the harmonic vibrations, wherein the said vibration is selected to include at least one among the base mode as the first harmonic, second harmonic, third harmonic and fourth harmonic.

Example 4

With reference to the Fig 3D that is illustrating generation of a damping signal to control the damping of the saw blade by electromagnetic arrangement with therein included at least one of the magnets 3ml, 3m2 and 3m3 as embodied, to be driven by the signal generator Dr to provide the electric current for the magnetic field constitution of the mentioned magnet(s). Although three magnets are shown, there can be less or further magnets at the vibration amplitude maxima positions on the blade. To illustrate the optionality of the magnet number, 3ml and 3m2 are drawn with dashed lines. A skilled person knows from the disclosed embodiment variant that phase adjustment can be based on feed-back loop and a sensor used to measure the amplitude of the vibration. Accordingly, the generator as such can comprise a phase lock circuit to lock to the anti-mode phase to provide the electric signal to control the magnets (3ml, 3m2, 3m3).

According to an embodiment variant, at least one of the magnets is/are connected to the electric signal being used to produce the magnetic field in certain sequence corresponding the vibration frequency but being phased to damp the vibration.

According to an embodiment variant a number of electric magnets in the electro magnetic damper arrangement are positioned to a dedicated positions each 3ml, 3m2, 3m3 to cast their magnetic field to the corresponding positions on the saw blade, which position(s) is/are corresponding the position of the maximum amplitude of certain harmonic vibration mode(s) to be damped by the magnetic field pulsating with the same dedicated frequency but phased to damp the vibration at the associated dedicated frequency, when the magnets are operated by electric signals to constitute the magnetic fields for the damping. The frequency as well as the phase can be adjustable for the operator to adapt to different operating conditions with suitable blade and the blade geometry. The control can be made via the circuit comprising the anti-mode phase lock.

According to an embodiment variant, the electric magnets can be provided both sides of the saw blade. A skilled person in the filed knows from the embodiments of the present disclosure of the invention that within the electro-magnetic damper arrangement embodiments the blade has a magnetic position at the locations where the damping is being directed. This can be embodied by magnetic blade material, but alternatively magnetic material tablets to provide spots like buttons as attached to the saw blade for the magnetic interaction.

Although the optimum position on the saw blade for the damping were at the maximum amplitude of a vibration mode, especially when concerning the base mode and the saw blade tip as in a free position, in practical reasons the maximum amplitude can be considered as an effective maximum amplitude and the corresponding position on the saw blade, especially when the saw blade tip being considered to maintain its operation as free or the tip is occupied for support etc. In such a case the effective maximum amplitude corresponding position, especially to the base mode, can be considered at a position of a further higher harmonic maximum amplitude, or a position between such position and the saw blade tip.

A skilled person knows from the embodiments, that the vibration frequencies, the base mode as the first harmonic as well as the higher harmonics are determined by the saw blade geometry, especially the length of the saw blade. According to an embodiment variant, the embodiments can be used in combination with each other in suitable part in the damping, especially in optimizing the saw blade lifting and return as well as other sawing related desired movements in respect of energy efficiency and/or abrasion of the saw blade.

Consequently, a skilled person may on the basis of this disclosure and general knowledge apply the provided teachings in order to implement the scope of the present invention as defined by the appended claims in each particular use case with necessary modifications, deletions, and additions.