HANSEN JAN (NO)
| DE3630908C2 | 1995-11-16 | |||
| DE3523033A1 | 1986-02-13 | |||
| DE3314175C1 | 1984-08-16 | |||
| DE2903574A1 | 1979-09-27 | |||
| GB1320203A | 1973-06-13 | |||
| CH161109A | 1933-04-15 | |||
| GB1124586A | 1968-08-21 | |||
| FR2553331A1 | 1985-04-19 |
| 1. | A method for producing roof truss elements or other wooden elements, where both end sections have to be cut and where two saw units are employed which are arranged at a desired distance apart and where the element is secured during the cutting, characterized in that, after the two saw units (1,2) have been arranged at the desired distance apart, a stock for the element is fed forward in its longitudinal direction until the element abuts against an end stopper (14), that the stock is then moved in the transverse direction to the correct cutting position, that the stock is then secured with a force which presses the stock against the saw table, while at the same time the saw blade is moved up from the underside of the table, the blade first having been given a desired angular position, whereupon the cut, finished element is passed out across its longitudinal direction, while end cuts are removed from the saw table. |
| 2. | A method according to claim 1, characterized in that the saw (1,2) is brought into an active working position only after the stock has been placed in position and secured and that the activation of the saws and transfer from the underside are synchronized. |
| 3. | A device for producing roof truss elements and other wooden elements where both the end sections are cut, comprising two saw units (1,2), where at least one of the units ( 1 ) is movable towards and from the other unit on a floormounted rail device (13), characterized in that as saw units (1,2) there are employed two known per se saws which are activated from a joint control console (12) with saw table and a tiltable and angle adjustable saw blade which is individually adjustable with the possibility for cutting at all angles between 0 and 180 , i.e. also cutting of longitudinal incisions and wedges, the table for these saw units is equipped with means (14,8,7) which can be moved forwards and backwards for placing the stock in the correct position in the longitudinal direction between the saw units and in the transverse direction in relation to the saw blade, above the saw's area of operation there is provided a raisable and lowerable protective cover (4) which is equipped with securing means (5,6) which abut against the stock's top surface, 4) both saw tables (1,2) are equipped with synchronously acting ejection means (9) for the manufactured element, and preferably also means (15) for removal of end cuts, and in the device's longitudinal direction, in front of one saw (2) there is installed a roller conveyor which extends as an extension of the saw's (2) table in the feedin direction for the stocks, which roller conveyor is equipped with means for feeding in and possibly securing of stocks. |
| 4. | A device according to claim 1, characterized in that the control console (12) also includes controls for the means for positioning of the stock on the saw tables. |
| 5. | A device according to claim 3, characterized in that the control console is provided as a separate unit on an adjustable arm, preferably between the saw tables (1,2). |
| 6. | A device according to claim 3, characterized in that the positioning means for the stocks comprise adjustable stoppers and sliders (8,10,14). |
| 7. | A device according to claim 3, characterized in that the operating mechanisms are pneumatic, hydraulic or electrical. |
The present invention concerns a method for producing roof truss elements or other wood materials, wherein both ends of the elements have to be cut, and a device for use in the method.
Previously, the stock was cut on one side, then turned and cut on the opposite side. This was very cumbersome and since it was necessary to turn the material, small errors often occurred in the cutting.
In order to avoid this double saws have been developed, but these have been extremely expensive and have limited scope for adjustment.
One of the objects of the present invention is to provide a simple, reasonably priced design, which has extensive possibilities for variation, both in angle and length, where exact cutting and feeding are ensured with simple operation, and where the safety of the operator is guaranteed. Furthermore it should be possible to cut all possible angles, from very sharp to blunt, and by having a saw blade which can be tilted, it should be possible to manufacture roof trusses for hip roofs in one operation.
Furthermore the device should be able to be controlled from a separate console which enables both saws to be controlled from one location, also with synchronous operation including fixing.
The object of the present invention is therefore to provide a method for producing roof truss elements which permits simultaneous cutting of the ends of the roof truss elements and a device for use in the method.
These objects are achieved with a method for producing roof trusses and a device for use in the method according to the type mentioned in the introduction, which is characterized by the features which are presented in the attached claims.
By means of the invention a device is achieved by simple means for use in double cutting, preferably of roof truss elements, which substantially
increases the accuracy of the cutting of such roof trusses as well as reducing their manufacture time.
The design according to the invention gives a highly efficient operation which is suitable for a high degree of automation.
The invention will now be described in more detail by means of an embodiment which is illustrated in the drawing, in which:
fig. 1 is a perspective view of the device according to the invention,
fig. 2 is a perspective view of a saw unit according to the invention, where retractors and ejection mechanisms for stocks/elements are omitted, and
fig. 3 is a perspective view which illustrates the mechanisms omitted in fig.
2.
Figure 1 illustrates an embodiment consisting of two saw units 1 and 2, in the form of known per se saw units, arranged alongside each other and connected by means of a rail track 13, where one of the saws 2 is stationary while the other saw 1 is movable in the lateral direction in relation to saw 1, thus providing a simple adjustment of the desired cutting length of a roof truss element.
The saw units 1 and 2 comprise a turntable 3 for adjusting the cutting angle (±90 ) with a saw blade which can be tilted 45 . The turntable 3 can be adjusted 180 by means of a tool (not shown) which is located in suitable holes in the turntable for manual or motorized rotation/adjustment of the cutting angle. An upper protector 4 with suction is provided above the turntable 3, where the upper protector 4 is raisably and lowerably mounted to a securing body 5 which is mounted via an arm 6 in one edge/corner of the saw. On opposite sides of the saws 1 and 2 there are provided retractors 7 for securing the element stock against a slide 8 which is adjustably provided on the work table, and ejection mechanisms 9 in the form of raisable and lowerable roller conveyors for automatic transfer of finished roof trusses from the work table to an area behind the saws. The slide 8, which is equipped with a stopper 10 for abutment with the element and which works together with the retractor 7 for securing the element stock, can be adjusted by means
of a lever 11 in order to obtain correct centre distance. For positioning of the element stocks in the longitudinal direction an adjustable stopper 14 is provided opposite the slide 8. Furthermore end cuts and the like are removed automatically by means of a pneumatically driven device 15 which "sweeps" the work table, preferably on the saw unit 1.
The device is operated by means of a control device 12, provided between the saw units 1 and 2, and consists of a two-handed release device, which by means of PLS control (not shown) controls the work cycle.
The manufacture of roof truss elements or other wood materials, where both ends of the elements have to be cut, is performed in the following manner:
The device, which according to fig. 1 is composed of two semi-automatic machines, preferably the Gjerde saw, where the saw blade is located under the tabletop/turntable and during cutting it is raised up through this, and where only the feeding in of the element stocks is performed manually, is adjusted in relation to the desired cutting length by means of the saw 1 and in relation to the element's width by means of the lever 11. The element stocks are positioned in the longitudinal direction by means of the adjustable stopper 14 and then fed in continuously by means of the retractor to the correct position. The subsequent work cycle is controlled automatically by means of the two-handed release device 12. The element stock which is positioned against the stoppers 10 by means of the pneumatic retractors 7, is then fixed by means of the securing mechanisms 5, while at the same time the upper protectors 4 are lowered over the cutting zones. The saw blades are passed up through a slot in the work table, cut the element stock and return to the starting position. The upper protectors 4, the securing mechanisms 5 and the retractors 7 then return, and the element stock is lifted by means of the roller conveyors 9 and is tipped out behind the saw units. Finally end cuts and the like are removed by means of the device 15, preferably on the saw unit 1.
The roller conveyor 9 which is provided in extension of the rail track 13 enables short material stocks to be cut and possibly cutting of both straight and longitudinal incisions in the form of wedges.
The machines can also be supplied with additional equipment which increases the degree of automation with the result that the device can be converted to a
preprogrammable wholly-automatic device for the manufacture of roof truss elements. This can be implemented by means of, e.g., PC control, and supply turntables (cutting angle), tilting mechanism for saw blade, length adjustment as well as feeding in and out of the element stocks by pneumatic, hydraulic or electrical operation.
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