EP0057469B1 - Stop device for wood working machines - Google Patents

Abstract

1. A stop device (9) for machines for the frontal working of timbers, more especially of window timbers, such as tenoning and slotting machines, with a device (4) for cutting the timbers to length which is connected upstream in the working direction of the tenoning spindle (3) and with a roller table (5) which conducts the workpieces past the cutting-to-length device and the tenoning spindle, characterised in that provided in the working sequence in front of the cutting-to-length device (4) is a fixed guide (10), extending perpendicularly to the direction of movement of the roller table (5), for a stop (11) which is displaceable along the guide and which engages over the roller table (5) in the initial position and which lies with its abutment surface (19) in a parallel plane to the direction of movement of the roller table (5), in which respect the stop (11) is driven by means of a toothed belt (12) reinforced by tensile strand inserts and is securable in various adjustment positions, predetermined by an electronic control, relative to the guide (10).

Description

The invention relates to a stop device for machines for frontal machining of wood, in particular window wood, such as tenoning and slotting machines, with a cutting device for the woods, which is connected upstream in the machining direction of the tenoning spindle and with a roller table, which the workpieces on the cutting device and Tang drive spindle passes.

A known stop device of this type consists of a measuring stick, which is attached to the roller table and carries a hand-displaceable stop, which has a display device which lies opposite a scale on the measuring stick. With such a device, the distance between the stop and the cutting device can therefore be adjusted. The cutting device is usually a saw.

The disadvantage of this known arrangement is that, with different successive lengths of the wood to be processed, the repeated adjustment of the stop by hand, which is required as a result, is complex and that under certain circumstances reading errors on the scale and thus the production of rejects can easily occur.

The invention is therefore based on the object to provide a stop device of the type mentioned, with which these disadvantages are avoided and which ensures that the lengths required in each case can be set quickly and easily without difficulty.

This object is achieved in that, in the workflow in front of the cutting device, a stationary guide extending perpendicular to the direction of movement of the roller table for a stop displaceable along the guide, overlapping the roller table in the starting position and with its abutment surface in a plane parallel to the direction of movement of the roller table is provided, the stop being driven by means of a toothed belt reinforced by tension cord inserts and being fixable relative to the guide in various setting positions predetermined by an electronic control.

With this arrangement, it is achieved that workpieces, in particular window timbers of different lengths, can be produced directly one after the other, without this requiring a greater expenditure of time for adjusting the stop by hand. This makes it possible, in particular, to complete a window composed of wood of different lengths in one continuous operation, so that intermediate storage can be saved. In addition, the arrangement according to the invention has the advantage that reading errors can no longer occur because the lengths to be used in each case can be preprogrammed in the electronic control system, so that only the respective operating button that corresponds to a certain length needs to be actuated.

The quickly repeatable and easily electronically controllable setting is made possible by the use of the toothed belt as a transmission element, because this enables a slip-free transmission of the drive of the stop over long distances. The toothed belt also enables a relatively high movement speed of the stop and relatively short start-up and braking times.

Compared to other, possibly possible drives, such as a ball screw, the arrangement according to the invention has the advantage that it works practically without play, so that it is not necessary to run the drive backwards to reach a certain stopping point. The same advantage exists over drives of a different kind, such as chain drives, which would also have the disadvantage that chain wear would occur during operation due to the wear that occurred, so that exact length adjustments would not be possible.

The device according to the invention can be controlled particularly easily and precisely electronically if the toothed belt is driven by a stepper motor. A good embodiment for such a stepper motor can be that it makes 400 steps per revolution and moves at a maximum of 600 revolutions per minute. It is particularly advantageous here if a reduction is provided between the stepper motor and the toothed belt drive, so that at least one step of the stepper motor corresponds to a movement of the stop on the guide of approximately 0.1 mm.

The use of such a stepper motor makes it possible to provide exact longitudinal movements of the stop on the guide in the manner described, the movement by 0.1 mm at the same time the accuracy of the device, i. H. corresponds to the maximum tolerance.

The use of a stepper motor also has the advantage that the special movement characteristics of a stepper motor can be exploited when starting up and braking, which consists in the fact that a relatively rapid start-up gradually changes into the actual movement phase and braking takes place in the same way. This ensures that both the start-up and the braking phase are kept relatively small and that an exact stopping takes place at the predetermined point.

The reduction of the speeds of the stepper motor for the toothed belt drive also advantageously consists of toothed belt drives. expediently two ge in succession Switched belt drives are used to prevent the angle of curvature of the toothed belt around the output pinion from becoming too small. Such an arrangement has the advantage that the translation between the stepper motor and the toothed belt drive for the stop is almost free of play and slip-free. It has proven to be useful if four steps of the stepper motor correspond to the movement of 0.1 mm of the stop.

The lengths that the stop has to travel through are expediently specified to the stepping motor by a computing device, a microprocessor or the like in the form of step numbers. In this way it is achieved that the stepper motor is automatically stopped after the number of predetermined steps has expired.

At the same time, this computer or microprocessor is designed in such a way that it specifies steps with increasing or decreasing frequency in the initial and braking phases, so that starting and braking can be carried out in an optimal manner.

Finally, a zero point setting can be provided, which can consist of an inductive transmitter, which is assigned to the movable stop in the area of the guide. This transmitter switches on the stepper motor via the computer or the microprocessor in such a way that the stop is brought to a stop in a position corresponding to a specific maximum induction with respect to the transmitter. If this position is exceeded, the microprocessor controls the stepper motor in the opposite direction until the zero position is reached by repeated oscillations.

It is particularly advantageous here if the transmitter can be adjusted along the guide of the stop, since in this way the zero position and thus the length assignment can be changed depending on the assignment of the device according to the invention to different machines.

The device according to the invention is therefore able to set the stop precisely and without slip to the specified lengths. However, this only applies to the drive itself. To ensure that, in the set position, the stop can also absorb greater impact forces, in particular from opposing window frames, the invention further provides for the stop to be fixed in the respective setting position. This can be done by a coupling in the drive of the toothed belt, which fixes the drive shaft for the toothed belt in relation to a stationary housing. A magnetic coupling of various types, in particular a magnetic tooth coupling, can be used for this. However, it is still disadvantageous here that the forces acting on the stop act on the free end of the toothed belt corresponding to the length of the wood, so that the forces are absorbed elastically in the expansion area of the toothed belt.

It is therefore particularly advantageous if the stop is fixed on its guide. This can be done by means of a brake, a clamp or the like, which acts on the guide itself.

If, as further provided, the guide consists of two parallel rails, the fixing can be brought about in that the stop carries at least one clamping jaw assigned to a rail, which is pressed against the rail. This can be done by a pneumatic cylinder or the like.

It is particularly advantageous if the guides are designed as round rails which are overlapped by the guide pieces of the stop and the clamping jaws. Guides of this type are particularly easy to manufacture precisely.

In order to ensure that the stop actually reaches the predetermined stopping point, the brakes, whether in the form of the clutch or the clamping jaws, are actuated at a time interval after the stepping motor has been stopped. When starting, the brakes are released at the appropriate time interval before starting the stepper motor. This takes place in the millisecond range.

A stationary cover that runs parallel to the guides can connect to the roller table. which carries the rear end of the window wood and is run over by the stop.

According to a further aspect of the invention is a woodworking machine according to the preamble of claim 26, the z. B. is known from DE-A-28 08 276, equipped with the electronically controlled stop device according to one of claims 1 to 25.

According to a further aspect of the invention is a woodworking machine according to the preamble of claim 27, the z. B. is known from DE-B-21 38 137, equipped with the electronically controlled stop device according to one of claims 1 to 25.

According to a further aspect of the invention, a method for the production of windows in series production according to the preamble of claim 28 is provided, which is to be attributed to the general state of the art, in which cutting to length using the electronically controlled stop device according to one of claims 1 to 25 the window frames are made.

With such a method it is achieved that the wood of a single window, that is alternately always two long and two short window timbers, can be processed in succession in the manner described, so that at the end of the run the window can be completely completed. Intermediate storage can thus be omitted.

• Figur 1 zeigt eine Ausführungsform der erfindungsgemäßen Vorrichtung in Draufsicht.
• Figur 2 ist die Ansicht 11-11 nach Fig. 1.
• Figur 3 ist in vergrößertem Maßstab der Schnitt 111-111 nach Fig. 1 und zeigt die Antriebsvorrichtung für den Anschlag im einzelnen.
• Figur 4 ist die Ansicht IV-IV nach Fig. 3.
• Figur 5 zeigt im Schnitt eine Ausführungsform zur Festlegung des Anschlages auf der Führung.
• Figur 6 ist eine Ansicht ähnlich wie Fig. 5 bei einer abgewandelten Ausführungsform.
• Figur 7 ist das Schrittfrequenz-Zeitdiagramm für den als Antrieb verwendeten Schrittmotor.
• Figur 8 zeigt in schematischer Darstellung und in Draufsicht die Anwendung der erfindungsgemäßen Vorrichtung auf eine Holzbearbeitungsmaschine mit Winkelübergabe zwischen einer Zapfenschlagspindel und nachgeordneten Frässpindeln.

The invention is explained in more detail below on the basis of exemplary embodiments in the drawing.

• Figure 1 shows an embodiment of the device according to the invention in plan view.
• FIG. 2 is the view 11-11 of FIG. 1.
• Figure 3 is on an enlarged scale Section 111-111 of FIG. 1 and shows the drive device for the stop in detail.
• FIG. 4 is the view IV-IV according to FIG. 3.
• Figure 5 shows in section an embodiment for fixing the stop on the guide.
• Figure 6 is a view similar to Figure 5 in a modified embodiment.
• Figure 7 is the cadence time diagram for the stepper motor used as the drive.
• Figure 8 shows a schematic representation and top view of the application of the device according to the invention to a woodworking machine with an angle transfer between a tenoning spindle and downstream milling spindles.

According to FIGS. 1 and 2, a woodworking machine 1 with a plurality of milling spindles 2 for longitudinal profiling, only one of which is shown in FIG. 1, and a tenoning and slotting spindle 3 and a cutting device 4 is assigned a roller table 5, which in the direction of arrow 6 past the cutting device 4 and the tenoning and slotting spindle 3 together with the workpieces located there or clamped there. In the exemplary embodiment shown, the cutting device 4 consists of a driven saw blade 8 and a drive motor 7.

In the workflow in front of the cutting device 4, a stop device 9 is arranged, which consists of a stationary guide 10, which extends perpendicular to the direction of movement of the roller table 5, for a stop 11 which can be displaced along the guide, the stop in its extreme retracted end position on the left in FIG. 1 with solid lines and on the right in Fig. 1 in its most advanced end position is shown in dashed lines.

The stop is driven by means of a toothed belt 12 reinforced by tension cord inserts, which is attached with its upper run to a cross member 13 or the like of the stop. The toothed belt 12 runs over three pinions 14a, 14b and 14c, of which the pinion 14c on the right in FIG. 1 is driven in the exemplary embodiment shown. The drive of the pinion 14c is electronically controlled in the manner described below, so that the stop 11 can be fixed quickly and safely in various setting positions.

In the exemplary embodiment shown, the guide 10 consists of two round rails 15 (see also FIG. 2) which are overlapped by guide pieces 16 of the stop (see FIG. 2). As can further be seen from FIG. 2, the stop consists of a horizontal plate 17 to which a plate 18 arranged perpendicularly thereto is connected, which has the actual abutment or stop surface 19 (FIG. 1) for the workpieces. As can further be seen from FIG. 1, the stop 11 overlaps the roller table 5 with a section 20 in its starting position shown in FIG. 1, whereby known clamping devices for the workpiece are provided on the roller table, which allow the workpiece to be known to be clamped on the roller table 5 in the setting specified by the respective position of the stop. Connected to the roller table 5 is a stationary cover 21 which runs parallel to the guide rails 15 and which supports the rear end of the workpiece to be machined in the starting position. This cover 21 is also overlapped or passed over by the section 20 of the stop 11. When the roller table 5 moves in the direction of the arrow 6 towards the cutting device 4 or the tenon and slot spindle 3, the workpiece is taken away from the roller table and leaves the cover 21 in order to further support cantilevered workpieces Cover 21 or a roller conveyor (not shown here) may be provided.

Furthermore, an inductive transducer is indicated in FIG. 1, which is assigned to the movable stop 11 in the region of the guide 10. This sensor is used for zero point adjustment and switches on the drive of the toothed belt 12, which will be described in such a way that the stop 11 is brought to a stop in a position corresponding to a certain maximum induction relative to the sensor 22. This position may be achieved by swinging back and forth. The transducer 22 can in turn be adjustable along the guide 10 of the stop 11, for which purpose a separate guide 23 can optionally be provided.

Fig. 3 is the partial section 111-111 of FIG. 2 on an enlarged scale and shows the drive of the drive pinion 14c in detail. The associated FIG. 4 is the view IV-IV according to FIG. 3.

As can be seen from FIGS. 3 and 4, the toothed belt 12 is driven by a stepper motor 24, a reduction being provided between the stepper motor 24 and the toothed belt drive, which also consists of two toothed belt drives 25 and 26 in the exemplary embodiment shown. The toothed belt drive 25 has an output pinion 26 which is arranged in a fixed position with the pinion 14c on a common shaft 27 and is driven by a drive pinion 29 via a toothed belt 28. This in turn sits with a drive pinion 30 on a common shaft 31, which is driven by a drive pinion 33 on the shaft of the stepping motor 24 via a toothed belt 32.

In order to fix the stop 11 in the respectively predefined setting position, a first embodiment for fixing the toothed belt is provided in FIG. 3. There it consists of a magnetic tooth coupling, which has a sliding sleeve 34 or the like in a stationary housing 35, which overlaps a ring gear or a square 36 which is arranged in the extension of the shaft 27 and is fixedly connected to it. The components described last are indicated by dashed lines in FIG. 3.

Another embodiment is shown in FIG. 5. It one of the guide pieces 16 is formed here as at least one of the two guide rails 15, clamping jaws 37 and 38 encompassing on both sides, which are acted upon by a pneumatic cylinder 39 with an interposed clutch 40. The pneumatic cylinder 39 is actuated in the clamping direction at a time interval after the stepping motor 24 has come to a standstill, and is accordingly acted upon in the direction of release of the clamping jaws 37 and 38 when the stepping motor is started before the stepping motor is started.

6 shows a somewhat modified embodiment of the arrangement according to FIG. 5, part 41 of the guide pieces 16 being designed to be stationary and a pivotable clamping jaw 42 is provided which presses on one side against the guide rail 15 and against the stationary part 41 . The clamping jaw 42 is also acted upon by a double-acting pneumatic cylinder 43, the piston rod 44 of which is connected to the free end of the clamping jaw 42 by a threaded connection 45. The jaw 42 is pivotable about an axis 46 extending parallel to the guide rail 15.

Fig. 7 shows the step frequency-time diagram for the stepper motor 24. As can be seen from Fig. 7, the stepper motor has a particularly advantageous movement characteristic, which consists in the fact that a relatively rapid start-up in phase A gradually changes into the actual movement phase B and that the braking takes place in the same way in the braking phase C. In this way, both the start-up and the braking phases A and C are kept relatively small and an exact stopping at the specified point is guaranteed.

The stepper motor 24 is now electronically controlled for setting the required lengths so that a certain number of steps to be performed by the stepper motor are specified by a computer or a microprocessor. This number of steps corresponding to the respective length is stored in a control unit, so that only the desired length needs to be set or keyed in on the control unit, which the control unit then converts into the required number of steps for the stepper motor. After the number of specified steps has elapsed, the stepper motor is automatically stopped by the control unit.

To set a zero point from which the respective length is determined and which is therefore located in the area of the cutting device, the transmitter 22 is used in the manner already described, which is arranged adjustable for the stop 11 relative to the guide 10. With maximum induction, the electronic control system finds the zero point for the stop, from which the steps of the stepper motor specified by the electronic control system count.

The stop can pass the sensor and reach the zero point by swinging back and forth.

Fig. 8 shows two examples of application of the device according to the invention for a woodworking machine described above, in which both tenoning spindles 3 and milling spindles 2 are provided. If, as shown in FIG. 8, cut-to-length devices 4 and tenoning spindles 3 are provided on both sides of the milling spindles 2 for longitudinal profiling and the workpiece passes through the woodworking machine in the direction of arrows 47 to 49, then the stop device 9 according to the invention is expediently left in FIG. 8 between the Milling spindle 2 for longitudinal profiling and the downstream cutting device 4 arranged. In this application form, the workpiece cut to an approximate length is first guided past the cutting device 4 and the tenoning spindle 3 on the right in FIG. 8 by means of the roller table 5 there, in order to then be transferred to the milling spindles 2 at right angles to the longitudinal profiling. The feed device provided there and not shown here then conveys the workpiece in the direction of arrow 48 against the stop 11 previously brought into its position, whereby an additional slide can optionally be provided if the feed device of the milling spindles 2 does not convey beyond the plane of the saw 8 . This additional slide then complements the feed movement up to the stop 11. Then, by means of the roller table 5 on the left in FIG. 8, the workpiece is fed in the direction of arrow 49 to the cutting device 4 shown on the left in FIG. 8 and the associated tenoning spindle 3, so that also the pins and slots are attached to the second end face.

In another woodworking machine, in which a tenoning spindle 3 is provided only on one side, i.e. in which the cutting device 4 shown on the left in FIG. 8 and the associated tenoning spindle 3 are omitted, the stop device 9 according to the invention is shown in dashed lines on the right in FIG. 8 , the first cutting device 4 and the associated tenoning spindle 3 upstream. In this embodiment, the workpiece is brought to the exact dimension from the outset by means of the stop device 9 and the cutting device 4, provided with pins and slots on one side and then profiled lengthwise. The workpiece is then turned over and provided with the same tenoning spindle 3 in the second pass with tenons and slots.

The stop device according to the invention also makes it possible to save a considerable amount of work, time and storage space in the production of windows.

When producing a series of several identical windows, all the same lengths of wood are usually first produced and then stored temporarily, whereupon the missing lengths of different lengths are produced. Are the woods for a fen series finished, they are sorted out and connected to the window frames or sashes. The disadvantage here is that space-consuming intermediate storage is required and that additional work steps are required to transport to and from the intermediate storage and to put together the respective wood to the windows.

This known manufacturing process was due in particular to the fact that the setting of the lengths of the individual window timbers was time-consuming and cumbersome, so that it seemed advantageous to always first produce window timbers of the same length while accepting the disadvantages mentioned above. Using the stop device according to the invention, with which it is possible to change from one length to another very quickly, extremely precisely and automatically, this is no longer necessary. With the help of the stop device according to the invention, two window timbers of the same length can be cut to length, provided on both sides with pegs and slots and longitudinally profiled, whereupon the two other window timbers of different length required for the same window frame or the same sash can be processed in the same way. The pegs and slots of the first two window timbers can be provided with a glue application after their completion, so that the complete gluing of the window can take place immediately after the completion of the other two window timbers.

In this way it is achieved that the entire window is finished immediately after the finishing of the two remaining window timbers, with the saving of operations, time and intermediate storage space, this completion taking place while the processing of the window timbers continues. So no additional working time is required to complete the window; rather, complete windows are created in the same time that was previously only required for the production of the window timbers.

In particular, a wide variety of windows can be produced directly after one another in this way without wasting time.

Claims (29)

1. A stop device (9) for machines for the frontal working of timbers, more especially of window timbers, such as tenoning and slotting machines, with a device (4) for cutting the timbers to length which is connected upstream in the working direction of the tenoning spindle (3) and with a roller table (5) which conducts the workpieces past the cutting-to-length device and the tenoning spindle, characterised in that provided in the working sequence in front of the cutting-to-length device (4) is a fixed guide (10), extending perpendicularly to the direction of movement of the roller table (5), for a stop (11) which is displaceable along the guide and which engages over the roller table (5) in the the initial position and which lies with its abutment surface (19) in a parallel plane to the direction of movement of the roller table (5), in which respect the stop (11) is driven by means of a toothed belt (12) reinforced by tensile strand inserts and is securable in various adjustment positions, predetermined by an electronic control, relative to the guide (10).

2. A device according to claim 1, characterised in that the toothed belt (12) is driven by a stepping motor (24).

3. A device according to claim 2, characterised in that the stepping motor (24) carries out 400 steps per revolution.

4. A device according to claim 2 or 3, characterised in that the stepping motor moves at a maximum of 600 revolutions per minute.

5. A device according to one of claims 2 to 4, characterised in that a reduction gear is provided between the stepping motor (24) and the toothed-belt drive (12, 14c), in which respect at least one step of the stepping motor (24) corresponds to a movement of the stop (11) on the guide (10) of about 0.1 mm.

6. A device according to claim 5, characterised in that 4 steps of the stepping motor (24) correspond to a movement of 0.1 mm of the stop (11).

7. A device according to claim 5 or 6, characterised in that the reduction gear between the stepping motor (24) and the toothed-belt drive (12, 14c) likewise consists of toothed-belt drives (25, 26).

8. A device according to claim 7, characterised in that two toothed-belt drives (25, 26) connected in tandem are provided.

9. A device according to one of claims 2 to 8, characterised in that the stepping motor is so designed that a relatively rapid start-up phrase (A) changes over degressively into the actual movement phase (B) and in that the deceleration phase (C) proceeds correspondingly conversely to the start-up phase (A).

10. A device according to one of claims 2 to 9, characterised in that the distances which the stop (11) has to travel through are specified to the stepping motor (24) in the form of step counts by a computer, a microprocessor or the like.

11. A device according to claim 10, characterised in that the computer or microprocessor is so designed that in the starting and braking phase (A, C) it specifies steps with an increasing or, respectively, decreasing frequency.

12. A device according to one of the preceding claims, characterised in that a zero-point setting is provided for the respective adjustment position of the stop (11).

13. A device according to claim 12, characterised in that the zero-point setting consists of an inductive sensor (22) which is associated with the mobile stop (11) in the region of the guide (10).

14. A device according to claim 13, characterised in that by way of the computer or, respectively, the microprocessor the sensor (22) switches the stepping motor (24) so that the stop (11) is brought to a halt in a position relative to the sensor (22) which corresponds to a specific maximum induction, in which respect upon an overrun of the zero-point the computer or, respectively, the microprocessor controls the stepping motor (24) in the opposition direction until by moving back and forth the zero position is reached.

15. A device according to claim 13 or 14, characterised in that the sensor (22) is adjustable along the guide (10) of the stop (11).

16. A device according to one of the preceding claims, characterised in that the stop (11) is fixable in its respective adjustment position.

17. A device according to claim 16, characterised in that a clutch (34, 35, 36) is provided in the drive of the toothed belt (12) which secures the driving shaft (27) of the driving pinion (14c) for the toothed belt (12) relative to a fixed housing (35).

18. A device according to claim 17, characterised in that the clutch (34, 35, 36) is a magnetic clutch, more especially a magnetic toothed clutch.

19. A device according to claim 16, characterised in that the stop (11) is fixable on the guide (10).

20. A device according to claim 19, characterised in that the fixing is effected by a brake or clamp acting on the guide (10).

21. A device according to claim 20, characterised in that, in the case of a guide (10) which consists of two rails (15) extending parallel, the stop (11) carries at least one movable clamping jaw (37, 38, 42) which is associated with at least one rail (15) and which can be pressed against the rail (15).

22. A device according to claim 21, characterised in that the clamping jaws (37, 38, 42) can be acted upon by at least one pneumatic cylinder (39, 43).

23. A device according to claim 21 or 22, characterised in that the guide rails (15) have a circular cross-section and are engaged over by the guide pieces (16, 41) of the stop (11) and/or the clamping jaws (37, 38, 42).

24. A device according to one of claims 16 to 23, characterised in that the clutches or clamping jaws after reaching the respective adjustment position are acted upon in the closing direction at a time interval after stopping of the stepping motor (24) and upon the start-up acted upon in the opening direction at a time interval prior to the starting of the stepping motor (24).

25. A device according to one of the preceding claims, characterised in that linking on to the roller table (5) is a fixed cover (21) which extends parallel to the guide rails (15) and which carries the rearward end of the workpiece and can be over-run by at least a part (20) of the stop (11).

26. A woodworking machine more especially for working window timbers, in which at least one tenoning spindle (3) having a cutting-to-length device (4) which is connected upstream in the working sequence is associated with at least one milling spindle (2) for longitudinal profiling, in which respect the feed directions of the workpieces relative to the tools of these spindles extend at right angles to one another, so that the workpieces provided with tenons and slots can be transferred to the milling spindles (2) at a right angle, characterised in that a stop device (9) according to one of claims 1 to 25 is arranged in the working sequence in front of the cutting-to-length device (4) associated with the tenoning spindle (3).

27. A woodworking machine more especially for working window timbers, in which at least one tenoning spindle (3) having a cutting-to-length device (4) connected upstream in the working sequence is associated with at least one milling spindle (2) for the longitudinal profiling, in which respect the feed directions of the workpieces relative to the tools of these spindles extend at right angles to one another, so that the workpieces provided with tenons and slots can be transferred to the milling spindles (2) at a right angle and in which a further roller table (5) and a further tenoning spindle (3) having a second cutting-to-length device (4) are provided on the other side of the milling spindle (2) for the longitudinal profiling, characterised in that a stop device (9) according to one of claims 1 to 25 is arranged in the working direction in front of the second cutting-to-length device (4).

28. A method of mass producing windows by means of a woodworking machine (1) provided with feed and transportation mechanisms for the cutting to length, tenoning and longitudinal profiling as well as a device for glue application, characterised in that in each case two window timbers of an identical length are, in conjunction with the use of an electronically controlled stop device (9) according to one of claims 1 to 25, successively cut to length, provided on both sides with tenons and slots and longitudinally profiled, whereupon the tenons and slots of the two sides are provided with a coat of glue and at the same time or subsequently the two other window timbers of different length necessary for the same window frame or the same casement are worked in the same way and whereupon immediately after completion of the two other window timbers all four window timbers are joined together into a window frame or window casement and are secured by glue.

29. A method according to claim 28, characterised in that during the joining together and gluing of the window frames or window casements the working of the window timbers of the next window or windows is undertaken.

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