| 1. | A holder (100) for a device, such as a linkwelding device and/or a chain cooling device, included in a production line, for producing from a plurality of con secutively orientated open links (2') a plurality of consecutively orientated closed links (2) so as to form a chain with the aid of a rotatable disc (3) utilised in said production line, wherein a string (2') of loosely connected open links is fed to a pe ripheral edge region and/or surface portion of the disc, and wherein said links are advanced by rotation of the disc to a linkwelding device (31) and thereafter to a linkcooling device (32) and then to a device for removing slag products, charac terized in that said holder (100) is pivotal about a pivot shaft (101) for movement between at least one first and one second position, wherein said first position is adapted to allow a holdercarried device (31) to be placed in close proximity of a peripheral surface part (3c) of the rotatable disc, and the second position is adapt ed to allow the device (31) carried by the holder (1) to be placed above said pe ripheral surface part (3c). |
| 2. | A holder according to claim 1, characterized in that said device is fixed to said pivot shaft (101) by three arms. |
| 3. | A holder according to claim 1 or 2, characterized in that said pivot shaft is fixed to a lever arm arrangement, such as a wheel, which coacts with a weight balancing unit (104). |
| 4. | A holder according to claim 3, characterized in that a wheel, included in said lever arm arrangement, includes a groove, wherewith a first wheel part, sepa rated by said groove, is situated on the inside of a wall portion of a surrounding casing and a second wheel part separated by the groove is situated on the outside of said casing. |
| 5. | A holder according to claim 4, characterized in that the second wheel part coacts with a belt strap or a wire, which takesup tensile forces, and which is in cluded as a part of the weightbalancing unit. |
| 6. | A holder according to claim 4, characterized in that said belt strap or wire coacts with a wheel, belonging to a weightbalancing unit, fixedly attached to a lever arm arrangement. |
| 7. | A holder according to claim 6, characterized in that said wheel has an ir regular peripheral surface so as to enable a counterforce and a torque to be ad justed in relation to the instant position of rotation. |
| 8. | A holder according to claim 1, characterized in that said force is takenup by one or more position determining support pins, support surfaces or the like in the first setting position. |
| 9. | A holder according to claim 1, characterized in that said force is takenup by one or more position determining support pins, support surfaces or the like in said second setting position, said force being a force of small magnitude. |
| 10. | A holder according to claim 1,8 or 9, characterized in that the force and the torque at the second setting position are directed opposite to the force and the torque at the first setting position. |
| 11. | A holder according to claim 1, characterized in that the angle through which the device is pivoted about the pivot shaft is greater than 30 degrees. |
| 12. | A holder according to claim 11, characterized in that the angle through which the device is pivoted is less than 90 degrees. |
| 13. | A holder according to claim 1, characterized in that the pivot shaft is car ried by three supports, whose height positions can be adjusted individually. |
| 14. | A holder according to claim 13, characterized in that one support is posi tioned beneath a rotatable disc while two supports are positioned outwardly of a peripheral edge of said disc. |
| 15. | A holder according to claim 1, characterized in that the pivot shaft is posi tioned in a plane that coincides, or generally coincides, with a plane allocated to the disc. |
| 16. | A holder according to claim 1 or 15, characterized in that the shaft is posi tioned outwardly of a peripheral edge region of the disc. |
Even more particularly, the invention is concerned with a holder for a link- welding and/or a link-cooling device, that can be used in a production line for pro- ducing, from a plurality of consecutively orientated open chain-links, a plurality of consecutively orientated closed links which together form a flexible chain.
The present invention has been developed for use as a holder for one or more devices co-ordinated in a production line of the kind which utilises a rotatable disc or table and production line working stations, distributed around peripheral surface parts of said disc and orientated either totally or partially over the upper surface of said disc. In this regard, a plurality of chain-orientated open links are fed to a peripheral surface parts of the disc, wherewith the open links together form the chain, with respective open links being openly linked together and lying freely in relation to each other prior to being welded in a link-welding device to form a closed link chain.
Such positioning of the links on an edge region of the rotatable disc is il- lustrated and described in more detail in Swedish Patent Application, filed on Oc- tober 4,2000, under Application No. 0003587-3 and entitled"Feeding Arrange- ment for a Chain".
These open, or freely lying, links are then fed through a link-welding de- vice by the rotational movement of the disc.
Such a device is illustrated and described in more detail in Swedish Patent Application, filed on November 7,2000, under Application No. 0004064-2 and enti- tled"A Chain Welding Arrangement".
The welded closed-link chain is then fed to a link-cooling device.
Such a device is illustrated and described in more detail in Swedish Patent Application, filed on November 7,2000, under Application No 0004065-9 and enti- tled"A chain Cooling Arrangement".
Also used in such a production line is a device for removing slag products formed in the welding process.
Such a device is illustrated and described in more detail in Swedish Patent
Application, filed on October 25,2000, under Application No. 0003879-4 and enti- tled"An Arrangement for Removing Burrs".
Description of the background art With regard to the features associated with the present invention and with regard to the application to which the inventive holder can be applied in a link- welding device and/or in a chain-cooling device of the aforesaid natures, a plurality of different holders designed to this end are known to the art.
With respect to the prior art regarding a production line, particularly as- signed to the use application of the present invention, reference is made to the contents of the International Patent Application PCT/SE 83/00371, having the In- ternational Patent Publication No. WO 84/01788.
This prior publication illustrates and describes a method and a device for producing non-allergenic objects, particularly objects formed from metals that are intended for direct contact with the skin of a human being. The present invention is also intended to fulfil such requirements.
Examples of such objects include different types of chains comprised of different link structures, necklaces, ankle bracelets, wrist bracelets, earrings and/or nose rings, pieces of jewellery, watches, spectacles, etc., where completely pure metals, especially precious metals such as gold, silver, platinum, palladium, rho- dium, are alloyed with optimally pure zinc, copper, aluminium, nickel or chromium, and where treatment processes with the use of heating and cooling working sta- tions are carried out without access to air and without contact with surface reacting substances, such as salts or acids.
All heating and cooling processes are preferably carried out under the pro- tection of a shielding or protecting gas.
The device illustrated in this prior document utilises a production line for producing a string of closed links, which together form a flexible chain from a string of open chain-links.
The working stations of the production line include a first station, in which open links are linked together to form a string or band, a second station, in which the open links are welded to form closed links, a third station, in which the newly welded links are cooled down, and a fourth station, in which cooled links are fed out of the production line.
More particularly, it is said that in order to enable the method to be carried out, the device shall comprise a pivotal disc or table (61) for allowing a cold- worked object (66), in the form of an open-link chain, to pass through a link- welding device (63) or channel, with the use of a heating gas or a protecting or shielding gas (70), and a following link-cooling device (68), which uses the waste gases from the link-welding device (63), said waste gases being conducted through channels (71,73) as a cooling and protecting or shielding gas during the cooling sequence, wherewith displacement of the object (66) in the cooling station takes place concurrently with the supply of cooling and shielding gas. Different holders have been described for the devices orientated along the production line.
The contents of US-A-4,185,454 also belong to the earlier standpoint of techniques.
This prior publication illustrates and describes a device for inserting a link stud between opposite parts of a closed link in the manufacture of a chain, a heavy chain of particular design, whereafter the stud is firmly welded to the oppos- ing parts of the link portions. More particularly, there is used a pivotal arm which can co-act with a stud fastening station, where the free end of the arm co-operates with a holder means for holding said stud during movement, and wherein the arm can be moved backwards and forwards between two positions, one position in which the holder means is able to grip a loose stud adjacent a link stud feeding device and a delivery position in which the holder means is able to place the stud in a position between the mutually opposing parts of the link portions.
Moreover, the holder means shall be adaptively connected to the free end of the arm, so as to therewith be able to adapt and move the stud to a position pre- cisely in between said mutually opposing parts.
An important feature of this device is that the chain (4) has closed links, which are to be provided consecutively with a transverse stud (5) whilst the link is held between hydraulically operable press heads (2,3).
The holding means has the form of a pair of stud-gripping tongues (7).
Also included is the use of a circular table (25), which serves the purpose of advancing individual studs by virtue of a number of holders for each stud, where a lower holder (28a, 28b) is adapted to support the stud whereas side-related holders (26a, 26b) are adapted to firmly clamp the holder in a predetermined posi- tion.
The table (25) is rotatable in a direction referenced P3.
Summary of the invention Technical problems When taking into consideration the technical deliberations that a person skilled in this particular art must make in order to provide a solution to one or more technical problems that he/she encounters, it will be seen that on the one hand it is necessary initially to realise the measures and/or the sequence of measures that must be undertaken to this end, and on the other hand to realise which means is/are required in solving one or more of said problems. On this basis, it will be evident that the technical problems listed below are highly relevant to the devel- opment of the present invention.
When considering the present state of the art, as described above, it will be seen that a technical problem resides in the provision of a holder, which is par- ticularly adapted for a link-welding device and/or a link-cooling device that can be used directly in a production line in which a plurality of consecutively orientated closed links shall be produced from a plurality of consecutively orientated open links, and therewith form a chain, such as to provide conditions in which each of these devices may be rotatably orientated in relation to a chassis and therewith be able to take a set first position or lower position adjacent the rotatable disc or a set second position or upper position above and/or outwardly of said rotatable table or disc.
In the case of a production line which is constructed to produce from a plu- rality of consecutively orientated open links a plurality of consecutively orientated closed links such as to form a chain, with the aid of a rotatable table or disc where a string of freely connected open chain links are fed to the peripheral edge region of said disc and where said links are advanced by rotation of the disc to a link- welding device and thereafter to a link-cooling device and to a slag-removing de- vice, a technical problem resides in realising the significance of and the advan- tages afforded by mounting a holder, for said link-welding device and/or said chain-cooling device, for rotation about a horizontal axle such as to enable said devices to be brought at least to said first and said second position.
It will also be seen that a technical problem is one of being able to realise the significance of and the advantages afforded by positioning said axle of rotation
in a plane orientated in a plane allocated to the rotatable table or disc or in a plane in the close proximity of said disc plane, and to position said axle of rotation out- wardly of the peripheral edge region of said disc.
A technical problem also resides in the ability to realise the significance of and the advantages afforded by causing a device carried by said holder to be situ- ated in said first position in the close proximity of a peripheral surface portion or edge region of the rotatable disc.
A technical problem also resides in the ability to realise the significance of and the advantages afforded by arranging the second position to allow the device carried by said holder to be positioned above and to one side of said peripheral surface part in a direction outwardly thereof.
A further technical problem is one of being able to realise the significance of and the advantages afforded by fastening said device to said rotational axle through the medium of three holder arms.
Another technical problem is one of realising the significance of and the advantages afforded by fastening said rotational axle to a lever arm arrangement, such as a wheel, that co-acts with a weight-balancing unit.
A further technical problem resides in the ability of realising the signifi- cance of and the advantages afforded by providing said lever arm arrangement in the form of a wheel that includes a peripherally extending groove, where a first part of the wheel separated by said groove is located on the inside of part of a wall of a surrounding casing, and a second part of the wheel separated by said groove is situated on the outside of said casing.
A further technical problem resides in the ability of realising the signifi- cance of and the advantages afforded by allowing the second part of the wheel to co-act with a strap or a wire, which takes-up pulling forces or tension forces and which is included as a part of the weight-balancing unit.
Another technical problem is one of being able to realise the significance of and the advantages afforded by allowing said strap or wire to co-act with a wheel attached to a lever arm.
In the case of the illustrated application, it will be seen that a technical problem also resides in adapting the torque of the device in said first position to correspond or to slightly exceed the torque generated by the weight-balancing unit, but vice versa in the second position.
Another technical problem resides in the ability to realise the significance of and the advantages afforded by allocating to said wheel a peripheral surface whose radius is adapted to vary in accordance with a chosen position of rotation, designated an irregular peripheral surface, so as to enable the counter-acting force or counter-acting torque to be adapted in relation to the instant position of ro- tation.
Another technical problem resides in the ability of realising the significance of and the advantages afforded by causing a force acting on the disc in the first setting position to be taken-up by a position determining stop pin or stop screw, said force being a force of small magnitude.
Another technical problem resides in the ability of realising the significance of and the advantages afforded by causing a force acting against a stop in the second setting position to be taken-up by a position determining stop pin, stop screw or stop surface, said force being a force of small magnitude.
Another technical problem is one of being able to realise the significance of and the advantages afforded by causing the direction of said force in the second setting position to be opposite to the force direction in the first setting position.
A further technical problem is one of being able to realise the significance of and the advantages afforded by allowing the device to rotate about its rotational axle through an angle greater than 30 degrees.
Another technical problem resides in the ability to realise the significance of and the advantages afforded by causing said angle of rotation to be less than 90 degrees.
Still another technical problem resides in the ability of realising the signifi- cance of and the advantages afforded by supporting the rotational axle on three support elements whose height positions can be adjusted individually.
A further technical problem resides in the ability of realising the signifi- cance of and the advantages afforded by positioning one of these support ele- ments beneath the rotatable disc, while positioning the remaining two support elements outside the peripheral edge region of the disc.
Solution The present invention relates generally to the provision of a device holder.
The device held by the holder shall be a link-welding device and/or a
chain-cooling device, included in a production line for producing a plurality of con- secutively orientated closed links from a plurality of consecutively orientated open links and therewith form a chain, wherein there is used in the production line a ro- tatable table or disc that includes a peripheral edge region onto which there is fed an open-link chain, in which the links are loosely hooked one in the other, such that said links will be advanced to a link-welding device by rotation of the disc, and thereafter to a link-cooling device and from there to a slag removing device.
With the intention of solving one or more of the aforesaid technical prob- lems, it is proposed, in accordance with the invention, that the holder shall be ro- tatably arranged about a horizontal pivotable or rotational axle so that it can be moved to at least one first and one second fixed setting position, wherein the first position is adapted to position a holder-carried device close to a peripheral outer part of the rotatable disc, and wherein the second position is adapted to orientate said holder-carried device above and outwardly of said peripheral surface part.
By way of suggested embodiments that lie within the scope of the present invention, it is particularly proposed that said device shall be attached to said axle through the medium of three arms.
It is also proposed that a lever arm is fastened to said axle and adapted to co-act with a weight-balancing unit.
A wheel belonging to the lever arm arrangement includes a groove, wherewith a first part of the wheel separated by said groove is situated on the in- side of a wall portion of a surrounding casing, whereas a second part of the wheel separated by said groove is situated on the outside of said casing.
The second wheel part co-acts with a strap or wire which takes-up pulling or tension forces and which is included as a part of the weight-balancing unit.
The strap or wire shall conveniently co-act with a wheel fastened to a lever arm.
It is also proposed that the wheel may have an irregular peripheral sur- face, so as to enable the counter-force and the torque to be adjusted in relation to the instant position of rotation.
In the first setting position, a force acting on the disc is taken-up by a posi- tion determining stop pin or stop screw, this force being a force of small magni- tude.
In the second setting position, a force acting on a stop is taken-up by one
or more position determining stop surfaces, such as stop pins, said force being a force of small magnitude.
The force and the torque in the second setting position are opposite di- rected to the force and the torque in the first setting position.
The device is pivotable or moveable about the rotational axle through an angle greater than 30 degrees, but smaller than 90 degrees.
The rotational axle is conveniently carried by three support elements whose height positions can be adjusted individually.
One of these support elements is positioned beneath the rotatable disc, while two of said support elements are orientated outwardly of a peripheral edge region of the disc.
Advantages Those advantages primarily characteristic of a holder for a link-welding device reside in the creation of conditions which enable a simple and balanced movement or rotation of the device from a first setting position, in which said de- vice is in a close proximity of the disc, to a second setting position, in which said device is situated away from said disc, for inspection purposes.
In addition, conditions have been created for utilising a lever arm ar- rangement and a weight-balancing unit, orientated on the outside of a casing.
The primary characteristic features of a holder adapted for a link-welding and/or chain-cooling device in accordance with the invention are set forth in the characterising clause of the accompanying claim 1.
Brief description of the drawings An embodiment of a holder, adapted for co-action with a link-welding de- vice and having features significant of the present invention, will now be described in more detail with reference to the accompanying drawings, in which; Figure 1 illustrates a production line that includes a number of working sta- tions for producing a flexible closed-link chain from a plurality of con- secutively orientated chain-forming open links, with the aid of a work- ing station in the form of a link-welding device, among others;
Figure 2 illustrates more generally and in perspective view a casing associ- ated with the link-welding device, said casing co-acting with holder arms; Figure 3 illustrates in a horizontal view the casing and shows a casing co- acting holder in a first setting position, in accordance with the inven- tion; Figure 4 illustrates in a horizontal view solely the holder shown in fig. 3; and Figure 5 illustrates a schematic side view of a weight-balancing unit that ex- erts torque on a holder, and also shows a device carried by the holder.
Description of an embodiment at present preferred It will be noted that in the following description of an embodiment at pre- sent preferred and having the significant characteristic features of the invention il- lustrated in the various figures of the accompanying drawings, there have been used particular terms and particular terminology with the primary intention of clari- fying the inventive concept.
However, the expressions and terms used shall not be seen as limiting the scope of the invention and it will be understood that each term chosen shall be in- terpreted to include all technical equivalents that function the same or essentially the same way, so as to be able to achieve the same or essentially the same inten- tion and/or technical effect.
Figure 1 thus illustrates a production line 1 in which a closed-link chain 2 can be formed from a plurality of consecutively orientated open links that form an open-link chain 2'.
The consecutively orientated open links shown in fig. 1 are referenced 21', 22'and 23'respectively, whereas the closed links are referenced 21,22,23 re- spectively.
'The welds 21a, 22a situated in openings 21a', 22a'forming the closed links 21,22 are applied in a link-welding device.
The open links 21', 22', 23'shall be fed down to a planar upper surface 3' of a rotatable disc or table 3 at a position referenced 3a.
Downfeed of the chain device comprising open links 21', 22', 23'is shown and described more clearly in the Swedish Patent Application No. 0003587-3, filed
on October 4,2000, and the contents of this application shall be considered to form part of the present application, therewith to make more apparent a suitable application of the present invention in a production line that includes mutually se- quential working stations.
The open-link chain arrangement 2'resting on the planar upper surface 3' of the disc 3 is transported, section by section, through a welding or soldering sta- tion 31 and a following cooling station 32, whereafter the thus joined and closed chain links 21,22,23 are advanced along a radius-related circular outer part or section 3b of the disc 3.
A link-welding device 31 is shown and described in more detail in Swedish Patent Application No. 0004064-2, filed on November 7,2000, with the title"A Chain Welding Arrangement". The contents of this latter application shall be con- sidered as forming a part of the present application, therewith making more appar- ent a suitable application of the present invention within a production line that in- cludes mutually sequential working stations.
A link-cooling device 32 is shown and described in more detail in Swedish Patent Application No. 0004065-9, filed on the same date as the aforementioned application with the title"A Chain Cooling Arrangement". The contents of this latter application shall be considered as forming part of the present application therewith making suitable applications of the present invention within a production line that includes mutually sequential working stations more apparent.
Thus, the chain 2 consisting of closed links 21,22,23 is arranged to be transported in an arcuate path along the surface portion or surface section 3b of the rotatable disc 3.
A chain deflecting roller 4 functions to pass the chain 2, and chain sec- tions, from the upper planar surface 3'of the disc 3 in a curved path radially out- wards from the disc 3 and over the rounded edge region 3c of the disc 3.
This is achieved by rotational movement of the deflecting roller 4, which is mounted for rotation in the direction of arrow"P1"around the centre axis 4c of the roller.
Also shown is an abrasive disc 6, which is adapted for abrading slag prod- ucts that may have fastened on the planar surface 3'of the disc, through the me- dium of rotational movement in the direction of the arrow"P2".
In the illustrated case, the chain 2 has a section 2a, which leaves the link-
cooling device 32 and has a part 2c, which shall be curved around a deflecting roller 4, and also a section 2e, which, as a result of its intrinsic weight, causes the section 2c to be pressed against the peripheral surface 4a of that roller.
Deflection 2c of the closed link chain 2 around the deflecting roller 4 by means of the associated device constitutes a working station, in which slag prod- ucts or excess welding material fastened to the link in the welding station or the device 31 can be removed.
This device is shown and described in more detail in Swedish Patent Ap- plication No. 0003879-4, filed on October 25,2000. The contents of this latter ap- plication shall be considered to form part of the present application, therewith mak- ing a suitable use of the present invention more apparent.
The patent application is entitled"A Device for Removing Burrs".
The present invention thus includes a holder 100, which is adapted for co- action with a link-welding device 31 and/or a chain-cooling device 32, which can be used in the production line shown in fig. 1 and including said working stations (3a, 31,32,4).
The open link chain is moved in the chain transporting direction by rota- tional movement of the disc 3, and the link-welding device 31 includes a plurality of sequentially disposed structured gas flames. Each gas flame is intended to deliver an adapted amount of thermal energy to respective links.
The successively generated, and therewith slowly increasing thermal en- ergy (temperature) delivered by each of these sequentially structured gas flames shall thus be adapted to cause a predetermined or at least generally determined increase in the temperature of respective open links during their transportation through the link-welding device 31.
Figure 2 illustrates in a perspective view the outer configuration of a work- ing station, which has the form of a link-welding device and which can be assumed to consist of a casing 31a, fixedly related to a chassis.
The casing 31 a includes an end-wall opening 31 b which is adapted to em- brace respective open links with the smallest possible clearance, as said links 23', 22', 21'are fed into the device 31.
It is assumed in this practical application that the link structure has a more rectangular cross-section, with one long side in abutment with the planar surface 3'and the opposing or distal long side facing upwards, while the mutually opposite
short sides define a right angle with the planar surface 3'.
The size of the end-wall opening 31 b can be adjusted by means of three ports, driven by motors 31c, 31d, and 31e.
A second end-wall opening 31 b'for the casing 31 is adapted to surround the chain 2, comprising closed links 23,22,21, with the smallest possible clear- ance.
The size of the end-wall opening 31 b'may be adjusted, with the aid of three ports, driven by motors 31c', 31d', 31e'.
In this respect, fig. 2 shows that a frame 31f, inside the casing 31, can be raised and lowered with the aid of screw devices 31 g, 31 h, 31 i, by a belt 31 k driven by a motor 311 (31 m). The height of the gas flames is controlled by a control unit, in response to the temperature sensed by means of a sensor 231.
A gas pressure connected to and causing the gas flames could concur- rently be made adjustable so as to enable the delivery of heat and said tempera- ture adjustment to be adapted to a predetermined value.
A further possibility lies in allowing the speed at which the disc 3 rotates to be adjusted.
Referring back to fig. 2, it will be seen that the device includes two motors 31c, 31d and 31 c', 31 d'respectively for actuating side-related ports, said motors being co-ordinated with a support means and facing towards the centre of the disc.
A respective third motor 31e and 31e'are intended for actuating an overly- ing port and extend above and across the chain.
The invention thus also includes a device holder 100, such as a holder for a link-welding device 31 and/or a chain-cooling device 32.
As will be seen from fig. 3 in particular, the holder 100 is pivotal about a pivot axle 101 and can take at least a first and a second fixed setting position.
The first position (figs. 2,3 and 4) is adapted for orientation of a device 31 carried by the holder 100 in the close proximity of a peripheral surface part or edge region 3c of a rotatable disc 3.
The second position (not shown) is adapted for orientation of the device 31 carried by the holder 100 over and to one side and outwardly of said peripheral edge region 3c.
The device 31 is fixed to the holder 100 and its pivot shaft 101 through the medium of three arms 102,102a, 102b, as will be seen more clearly from fig. 4.
A lever arm arrangement 103 is attached to the pivot shaft 101.
In the case of the illustrated embodiment, the lever arm arrangement comprises a wheel 103, which co-acts with a weight-balancing unit 104.
The wheel 103 includes a groove 103a, whereby one part 103b of the wheel, separated by said groove, is situated on the inside of a wall portion 105 of a surrounding casing.
The other part 103c of the wheel, separated by the groove, is situated on the outside of said casing.
The other or second part 103c of the wheel co-acts (according to fig. 5) with a strap, belt or wire 104a, which takes-up pulling forces (tension forces) and which is included as a part of the weight-balancing unit 104.
The belt, strap or wire 104a co-acts with a wheel 104b attached to a lever arm 104c.
The wheel 104b may have an irregular peripheral surface 104b'for ad- justment of the counter-force in relation to the instant position of rotation.
The force is taken-up by a position determining support pin 120 in the first setting position. This support pin 120 is adapted to restrict rotation of the pivot shaft 101, so that the device 31 will be brought to a first position in which the under surface of the device 31 lies very close to the planar surface 3'of the disc 3.
Only a small force F1 is chosen, said force generating a torque referenced "M1"about the wheel 103 through the medium of a lever arm.
The torque"M1"is counteracted by a torque"M2"generated by a force "F2".
When the device 31 is lifted up in an arcuate path about the pivot centre 103', the device will be rotated against the torque (M1), which can then be com- pensated for via the weight-balancing unit 104.
Thus, the torque"M1"in the first position (shown in fig. 5) will be slightly greater than the torque"M2"and the device 31 will rest against the support pin 120.
The torque relationships or ratios can be changed with a small rotational movement from the first position, so that the torque"M2"will be greater than the torque"M1"and the device 31 will be rotated upwards/outwards in an arcuate movement pattern.
In the second setting position, the force and the torque will be taken-up by
position determining pins, support surfaces or the like and may be of small magni- tude.
The direction, in which the force and the torque act in the second setting position, is opposite directed to the direction in which the force and the torque act in the first setting position.
The angle at which the device 31 is rotated or pivoted about the shaft 101 is greater than 30 degrees, for instance about 40-50 degrees. On the other hand, this angle should be smaller than 90 degrees.
The shaft 101 is carried by three supports 121,122,123, whose height positions can be adjusted individually.
One support 121 is positioned beneath the rotatable disc 3, while two sup- ports 122,123 are positioned outwardly of the peripheral edge region 3c of the disc 3.
It will be noted that the shaft 101 is positioned in a plane, which connects with a plane through the flat surface 3'of the disc 3, or at least in the close prox- imity of this plane. The shaft 101 is also positioned outwardly of the edge region 3c of the disc 3.
More particularly, one end-part 101 a of the shaft 101 is orientated at right angles to the diameter of the disc 3, as shown in fig. 3.
It will be understood that the invention is not restricted to the afore de- scribed and illustrated exemplifying embodiment thereof and that modifications can be made within the scope of the inventive concept as illustrated in the accom- panying claims.