GB2118095A - Woodworking machine for tenoning and profiling of window frame timbers - Google Patents

Abstract

A conveying device 8, 8a for feeding frame timbers from a first to a second of two oppositely-working tenon cutting and slotting units 1, 2 is provided between the two units which are arranged side by side in the feed direction of the timbers and which are associated with cutting-to-length devices, 3, 4 and roller tables 5, 6. An adjustable stop 10 determines the end measurement of the timber when the timber is fed by the conveying device 8, 8a to the second unit. <IMAGE>

Description

SPECIFICATION Woodworking machine This invention relates to a woodworking machine for the tenoning (or tenon cutting) and longitudinal profiling of frame timbers, more particularly of window timbers, said machine comprising two tenon cutting and slotting units, arranged one behind the other in the treatment direction, with respectively a cutting-to-length or cross-cut device, an associated roller table for working the two end surfaces of the window timbers and at least one milling unit for the longitudinal profiling.

In the case of a known machine of this kind, the arriving window timber is first of all provided, by means of the first tenon cutting and slotting unit, on its first end surface with tenons and slots, is then longitudinally profiled by means of a milling unit and is then provided, by the second tenon cutting and slotting unit, on its second end surface with tenons and slots. Subsequently the window timber is passed to a hand-over device and can be fed from there to further milling units.

What is disadvantageous in the case of this known machine is the fact that, because of the manner of the arrangement and association of the tenon cutting and slotting units and of the milling units, from the start the side respectively to be worked is preset, so that after the conveying into the machine a change in the side selection is no longer possible.

It is furthermore disadvantageous in the case of the known machine that, because of the longitudinal profilings already undertaken at the commencement of working, the further conveyance may, circumstances permitting, be impaired.

The problem underlying the invention is to design a woodworking machine of the kind mentioned at the beginning hereof in such a way that the machine is usable as universally as possible and that at the same time a far greater throughput than with the known machine is possible.

In accordance with the invention, this problem is solved in that arranged directly side-by-side are two oppositely-working tenon cutting and slotting units with a cutting-to-length device and a roller table with which the window timbers, merely planed on four sides and possibly ground smooth, can be provided on both end surfaces with tenon and slots, in which respect provided between the two tenon cutting and slotting units is a conveying device by means of which the window timber provided on its one end surface with tenons and slots and having no longitudinal profiling is conveyed to the second tenon cutting and slotting unit and, in the region thereof, against a stop which prescribes the exact end measurement.

With the aforementioned arrangement the result is achieved that from this input unit designed in accordance with the invention there emerge window timbers which are already cut exactly to size and which are provided on both sides with tenons and slots, but which have a square cross-section. Thus the possibility is created by providing these window timbers, by means of a subsequently-connected milling unit, by corresponding milling tool selection and/or by different arrangements and feeds of the milling tools, with various profilings, so that without any expenditure and without conversions, all possible types of profiles can be produced.More particularly the arrangement in accordance with the invention provides the possibility of associating or respectively inserting later various further treatment units, such as milling devices, glass (or glazing) saws and the like in the unit construction system of the input unit.

A further advantage of the arrangement in accordance with the invention consists in that two or more window timbers can be conveyed parallel side-by-side simultaneously into the input unit, be cut to length there simultaneously and be provided on both sides with tenons and slots, in order subsequently to be conveyed further transversely to their longitudinal direction. This is possible because a profiling of the window timbers after the passage through the input is still not undertaken, so that the window timbers join up fully with their side surfaces and cannot tilt over.

Preferably in each case two window timbers are conveyed in this way since thus the possibility is created of assembling the windows in each case complete at the outlet of the machine. With the arrangement in accordance with the invention it is more particularly possible to use a known 'per se' electronically-controlled stop, which prescribes (or presets) different lengths from window timber to window timber. Thus it is possible to cause the timbers of a single window to follow one another in pairs and to be able to assembly the windows at the outlet of the machine without intermediate storage and be able to feed same to a press.This is, in the case of the machine in accordance with the invention, completely independent of the size of the window, i.e. of the length of the window timbers, so that small and big windows can be alternated with one another in any desired manner without delay.

Of course, with the machine in accordance with the invention it is possible to transport and complete more than two timbers simultaneously in the aforementioned way, in which respect at the exit of the machine intermediate stores can be formed in the customary manner, which can more particularly be advantageous when large runs are to be produced with the machine in accordance with the invention.

It is particularly advantageous if the electronically-controlled stop is provided in known 'per se' manner on its side facing towards the end surfaces of the window timbers with a trigger or release device for triggering or releasing the roller table conveying the window timbers past the second cutting-to-length device and the second tenon cutting and slotting unit. The stop may have several such triggers, in which respect a respective trigger is associated with each individual parallel-conveyed window timber. The triggers are, in this respect, so connected that the further conveyance is only triggered when all the intended window timbers are disposed against the stop.

On the entry side of the input or entry unit, the window timbers need either only to be placed onto the roller table or need only be conveyed in so far as corresponds to the length of the roller table. The conveying-in movement is thus independent of the length of the window timbers, in the same way as the transverse movement passed the first cutting-to-length device and passed the first tenon cutting and slotting unit.

The length of the window timbers has an effect on the work cycle only when the window timbers are conveyed to the stop which is drawn back to an appropriately far extent in the case of long window timbers. From this there emerges a relatively long conveying time, the result of which is that the after-conveyed window timbers are already disposed in the conveying device between the two tenon cutting and slotting units and have to wait there during the conveying of the preceding long window timber as far as the stop for their transportation away.

This waiting position is brought about in that arranged in the region of the conveying device in front of the roller table of the second tenon cutting and slotting unit is a limit switch which can be acted upon by the respective window timber and through the actuation of which by means of a window timber running through the conveying device arranged between the two tenon cutting and slotting arrangements can be switched off in its conveying-in region facing towards the first tenon cutting and slotting unit.

Thus, no further window timber can be afterconveyed or re-conveyed so long as the rearward end of the previously conveyed window timber is still disposed in the conveying device between the two tenon cutting and slotting units.

Advantageously the switch-off happens in that at least the first feed roller, facing towards the following window timber, of the conveying device is raised, A further limit switch can be provided in the region of the end, facing towards the first tenon cutting and slotting unit, of the conveying device and be actuatable by a window timber running through, by means of which the first roller table is halted before the end position thereof facing towards the conveying mechanism so long as a preceding window timber is still disposed in the region of this limit switch.

Finally, the triggers of the stop can act upon the clamping devices of the second roller table insofar as this is in its end position facing towards the conveying device.

The limit switches and the triggers can be known 'per se' capacitive switches.

Long window timbers are, in the case of the machine in accordance with the invention, conveyed on a table which is associated with the stop, in which respect they have to bridge a spacing which is afforded by the width of the roller table which has to engage under the window timbers and feed the same to the cuttingto-length device and to the tenon cutting and slotting device. This spacing amounts, as a rule, to about 40 cm.

This means that short window timbers can to that extent not be conveyed as far as the stop, because they would drop into the gap between the conveying table of the tenon cutting and slotting unit and the supporting table of the stop.

The same holds true also for long timbers up to about a length of 1 m, which would tip into the gap.

For this reason care must be taken to see that, for the working of window timbers, the above mentioned spacing is bridged when the roller table is not in its end position facing towards the conveying device of the tenon cutting and slotting unit. This is indeed always the case when the conveying is so adjusted that a conveying of the window timbers to the stop takes place only when the roller table is in its drawn-back end position, but, for reasons of saving time, it is desirable, upon the alternate conveying of long and short timbers, to undertake the after conveying or re-conveying of the following timbers, more particularly of the short following timbers, when the roller table with one or more long window timbers already moves towards the second tenon cutting and slotting unit.

The roller table of the second tenon cutting and slotting unit is thus triggered when the window timbers that are to be worked encounter the stop.

Since, upon a preceding conveying of a long window timber, a relatively great deal of time has elapsed, it is advantageous if the after-conveying possibly of short window timbers is effected immediately subsequently. In this case, the roller table is not in its basic position in the region of the conveying device, so that the distance between the table of the conveying device and that of the stop has to be bridged.

This happens in accordance with the invention in that a follow-up or after-run table is provided which, after the running out of the second roller table out of its end position, follows this as far as into a bridging position which closes the gap between the supporting tables of the conveying device and of the stop and occupies in the bridging position the place thereof, so that following short window timbers cannot drop down. The follow-up table can be forced against the roller table by spring force or by a cable which is acted upon by a weight. A corresponding stop is provided for the respective end position of the follow-up table in the bridging position in which the roller table comes loose from the follow-up table.

Since, the follow-up table is forced back once more by the roller table running back, the roller table in this respect has to run under a window timber which is present on the follow-up table.

This means that the customary stationary stop, provided for the tenon cutting and slotting in counter-flow, for the window timber on that side of the roller table which faces away from the tenon cutting and slotting unit cannot be used. In order, nevertheless, to provide the necessary stop, which has to absorb the force of the cutting tools, two possibilities exist.

The one consists in that the stop is arranged on the side, facing towards the tenon cutting and slotting unit in its initial position, of the second roller table, which of course means that the tenon cutting and slotting then has to be effected in synchronism. In this case, however, the stop can be mounted stationarily in the customary manner.

In this case it is advantageous if an additional clamping unit, working parallel to the direction of movement of the roller table, is provided, which clamping unit forces the window timber that is to be worked against the stationary stop of the second roller table, so that this occupies an exact initial or starting position.

This clamping unit can be able to be acted upon by the triggers of the stop.

Another possibility consists in providing a downwardly-swingable stop which, after the underrun of the window timber waiting in the basic position, can be swung up behind the window timber.

This arrangement requires, underneath the roller table, additional space, since the necessary wooden support device and the reversal device thereof have to be swung down too.

It is advantageous if the milling or other further treatment unit following the input or entry unit are connected subsequent to a belt conveyor which establishes, in known 'per se' manner, the connection between the second tenon cutting and slotting unit and the following further treatment unit. Such a belt conveyor has a relatively large table surface, so that a stack of the window timbers previously conveyed in parallel can be formed on this in which respect, by grasping of the respectively first window timber and conveying away by means of the feed unit of the milling or other further treatment unit, the window timbers can be separated out once more at this point. The feed unit thus drawn the window timbers against the frictional force of the belt conveyor away from this.For this advantageously provided in the region of the feed unit is a stationary adjustable stop for the respectively following window timbers, which detains the respectively following window timber until the preceding window timber is conveyed away by means of the feed unit.

Here, too, limit switches can be provided which switch off or halt the first feed rollers, facing towards the arriving window timbers, of the feed unit until the preceding window timber has been conveyed off and/or been treated.

Since the machine in accordance with the invention can advantageously also be utilised for the stock production of glazing beads, it is advantageous if a special extraction device for glazing beads is provided, since, when the glazing beads are cut out of the case, because of the profile-occasioned design in each case the four casing timbers, lying at the bottom, must not be provided with a glazing bead cutout. For this purpose a swingable conveying rail for glazing bead extraction is provided, which is downwardly open and which is conducted out of the region of the milling stop when, in the case of every fourth window timber, a glass bead is not cut out. When the glazing bead has been cut out it is grasped by the outwardly-swung conveying rail, so that the glazing bead is pushed outwards from the conveying rail by the respectively following glazing bead.

The invention will be described further, by way of example, with reference to the accompanying drawings, in which: Fig. 1 is a schematic representation in plan of one preferred embodiment of the input unit of the machine in accordance with the invention; Fig. 2 is a view comparable with Fig. 1, but on a reduced scale, illustrating the use of the input unit in conjunction with further treatment units of the machine; Fig. 3 is a view similar to Fig. 2 but of a modified embodiment; Fig. 4 is a schematic representation of a modified embodiment for acting upon the followup table; Fig. 5 is a schematic representation of the transfer from a stack formed on the belt conveyor onto a subsequently-connected treatment unit; and Figs. 6 and 7 are schematic representations of an extraction device for glazing beads.

In the preferred embodiment in accordance with Fig. 1, provided directly side-by-side are two oppositely-working tenon cutting and slotting units 1 and 2, connected prior to or in series with, in the treatment direction, a cutting-tolength device 3 and 4 in the form of cross-cut saws. Associated with both units 1, 2 is in each case roller table 5 or 6 respectively, which conducts window timbers that are to be worked passed the cutting-to-length devices 3, 4 and passed the tenon cutting and slotting unit 12.

Provided between the two tenon cutting and slotting units 1 and 2 is a conveying device 7 which consists of individual driven feed rollers 8 and 8a which are arranged one behind the other.

Of these, the feed rollers 8a are, as shown, disposed above the end position, facing towards the conveying device 7, of the first roller table 5.

Linking to the second roller table 6 which is in its end position reproduced in solid lines is a supporting table 9, along which an adjustable stop 10 is displaceable. The stop carries, on its side facing towards the roller table 6, a trigger or release device 11 with which the movement of the second roller table 6 in the direction of the arrow 12 can be triggered. The surfaces of the roller tables 5 and 6, of the supporting table 9, of the stop 10, as well as of a supporting table 13 of the conveying device 7 are in alignment with one another.

For the purpose of the transfer from the roller table 5 by way of the conveying device 7 as far as the stop 10, at least one stop (or registering bar 1 4 is provided on the side, facing away from the tenon cutting and slotting units 1 and 2, of the input unit shown in Fig. 1.

Indicated in Fig. 1 are, furthermore, two limit switches 1 5 and 1 6, of which the first limit switch 1 5 is arranged in the region of the conveying device in front of the roller table 6 of the second tenon cutting and slotting unit 2, whilst the second limit switch 1 6 is provided in the region of the end, facing towards the first tenon cutting and slotting unit 1, of the conveying device 7.

Through the actuation of the first limit switch 1 5 by means of a window timber running through, the two first feed rollers 8a of the conveying device 7 are switched off or raised so long as the rearward end of a precedingly conveyed window timber is still disposed in the conveying device. Thus a further window timber cannot be re-conveyed during this period of time.

The second limit switch 1 6 is also acted upon by a window timber running through, whereby the first roller table 5 is halted in the position reproduced in broken lines so long as a preceding window timber is still disposed in the region of this limit switch.

The trigger 11 of the stop 11 triggers the movement of the second roller table 6 in the direction of the arrow 12, insofar as this is in its end position turned towards the conveying device 7 and shown in solid lines. At the same time, possibly provided clamping units for the window timbers present on the roller table are acted upon.

Insofar as several window timbers are to be treated and conveyed parallel to one another in the manner described, the stop 10 is, as indicated, advantageously provided with several triggers 1 a side-by-side, the number of which corresponds to the number of window timbers to be conveyed.

If the second roller table 6 is moved in the direction of the arrow 12 out of its end position illustrated in Fig. 1, between the supporting table 1 3 of the conveying device 7 and the supporting table 9 of the stop 10 there is a gap into which shorter window timbers can drop or tilt. Since it can, for the above-mentioned reasons be desirable to undertake the conveying onto the supporting table 9 of the stop 10 even when the roller table 6 is not in its end position, a follow-up table 1 8 is provided, which follows the movement of the roller table 6 into a bridging position between the two supporting tables 9 and 13.The follow-up table 18 can, as indicated scehmatically, be forced by means of springs 1 9 against the roller table 6, in which respect a stop 20, indicated schematically, can be provided which detains the follow-up table 18 in its bridging position, so that now the roller table 6 can come loose from the follow-up table.

The roller tables 5 and 6 are in each case provided with a stationary stop 21 or 22 respectively, in which respect the stop 21 of the roller table 5 lies, in the customary manner, on the side, turned away from the cutting and slotting unit 1, of the roller table, so that it can absorb the cutting forces occurring upon a working in counterflow, in other words upon a rotation of the cutting and slotting tools in the direction of the arrow 23, in which respect the window timber is forced against the stop 21.

Since, however, upon a re-conveying by means of the conveying device 7 onto the follow-up table 1 8 which is in the bridging position, the second roller table 6, upon its return travel, on the one hand has to force the follow-up table into the position shown in Fig. 1 and, on the other hand, has to travel over the window timbers present in this position, a stationary stop cannot in this case be provided on the side, facing towards the conveying device 7, of the second roller table 6, which stop would make possible the treatment of the window timber in counterflow.

For this reasons shown-the stationary stop 22 is arranged on the opposite side of the second roller table 6 and the tenon-cutting and slotting has to be effected in synchronism, i.e. the tenon cutting and slotting tools of the second tenon cutting and slotting unit 2 have to rotate in the direction indicated by arrow 24, so that the window timber is forced against the stop 22.

Additional clamping units, with which the window timber is held against the stop 22, are as a rule necessary.

Another possibility consists in arranging the stop 22, as is customary, on the side, facing towards the conveying device 7, of the roller table 6 and of undertaking a treatment in counterflow, in which thus the tenon cutting and slotting tools rotate contrary to the direction of the arrow 24. In this case, however, the stop must be capable of being swung downwardly during the return movement of the roller table 6, so that it can engage under the window timbers 25 which are in the bridging position and which are indicated in broken lines, and be able to be swung up behind these once again, as is indicated for instance at 26. A corresponding swinging down or folding down is then of course also necessary for the wooden support device and the switch-over or reversing device thereof.

The window timbers merely planed on four sides and possibly ground are fed, for example, by means of a belt conveyor 28 to the input unit 27 designed in this way, in which respect the window timbers are pushed along by stop flaps 29, that can be raised, in the direction indicated by arrow 30 onto the first roller table 5. In this respect, also several window timbers, preferably two, can be conveyed simultaneously onto the first roller table 5. Subsequently the roller table 5 moves in the direction of the arrow 31 passed the cutting-to-length device 3 and the first tenon cutting and slotting unit 1, in which respect the window timbers are cut to length at their end facing towards these units and are provided with tenons and slots.In the end position of the roller table 5, the window timbers are conveyed under the two first feed rollers 8a of the conveying device 7, in order to be further conveyed by these in the direction indicated by arrow 32, until they encounter the stop 10 or the trigger 11 or 11 a thereof. If two window timbers are to be treated simultaneously, two triggers 11 or 11 a respectively are provided, and if both triggers are acted upon, the movement of the roller table 6 in the direction of the arrow 12 is triggered and the second end surface of the window timbers is treated.

Subsequently, by means of a ram (tappet) or the like, the window timbers are transferred from the roller table 6 in the direction of the arrow 33 onto a further belt conveyor 34, the belts of which move in the direction of the arrow 35. In this respect, the window timbers are shifted along by raisable flaps 36.

During this cycle, the limit switches 1 5 and 1 6 have the above-described functions.

Fig. 2 illustrates in schematic representation the use of the input unit 27, described in connection with Fig. 1, in conjunction with further treatment units. Arranged in front of the input unit 27 and in front of the belt conveyor 28 are, in Fig.

2, a planing unit 37 and a grinding unit 38, with which the window timbers can be treated in the described manner on four sides.

The belt conveyor 34 behind the input unit 27 feeds the window timbers to a milling unit 39 and a glazing bead saw 40, which, in the exemplified embodiment shown, is provided with a special extraction device 41 which will be described further later on. For the further profiling, after an intermediate conveyor 42 further milling units 43 to 45 can be provided, in order to perform the most varied profilings or respectively to complete these.

The belt conveyor 34 can act as an intermediate stack for the window timbers cut precisely to length after leaving the input unit 27 and provided on both end surfaces with tenons and slots, in which respect, through the schematically indicated feed rollers 46a of the milling unit 39, always in each case the first window timber of this stack is grasped by the feed rollers 46a and is fed to the further treatment.

This first window timber is thus drawn off from the belt conveyor 34, so that the next window timber or timbers can move up through the belts moving in the direction of the arrow 35.

For this purpose, a stationary stop 47 (see Fig.

5) may be provided, which detains the following window timbers in their lateral relative position on the belts, so that they cannot be entrained by reason of the frictional locking during the extraction of the first window timber.

Also for this purpose limit switches 48 can be provided, which switch off or raise the first feed rollers 46a, facing towards the arriving window timbers, of the feed unit of the milling unit 39 until the preceding window timber has been conveyed away and/or treated.

The design, in accordance with the invention, of the input unit 27 makes it possible to associate or insert afterwards various further treatment devices more particularly in the unit construction system of the input unit 27. This can take place in different ways, as is made clear in Fig. 3. The arrangement in accordance with Fig. 3 differs from that in accordance with Fig. 2 in that milling units 49 and a glazing bead saw 40 are so connected to the belt conveyor 34 that the milling units point in the direction of the input unit 27, so that in this region a relatively compact type of construction of the entire machine arises.

Fig. 4 illustrates schematically a modified embodiment for forcing the follow-up table 18 against the roller table 6. In the case of this embodiment a cable 50 is provided which is acted upon by a weight 51 and is conducted over a stationary roller 52. The end of the cable 50 is fastened at 53 to the side, facing away from the roller table 6, of the follow-up table 18. In this way the follow-up table 18 is moved by the force, acting in the direction indicated by the arrow 54, of the weight 51, together with the roller table 6, in the direction of the arrow 12 until the side, turned towards the roller table 6, of the follow-up table 1 8 encounters the stationary stop 20. Upon a moving back of the roller table 6, the follow-up table 1 8 is forced back into the initial position reproduced in Figs. 4 and 1.

Fig. 5 illustrates in schematic representation the isolating of the timbers stacked on the belt conveyor 34. If, as is shown in Fig. 5, for example two window timbers are stacked, the first window timber 55 is grasped by the feed rollers 46a (see Fig. 2) and conveyed out in the direction of the arrow 57. The remaining window timbers 58 butt, in this respect, against the stationary stop 47, so that they cannot be conveyed out because of the frictional locking with the first window timber 55.

The extraction for example to the milling unit 39 can be effected along a stop rail 59, against which after the extraction of the first window timber 55 by reason of the movement of the belts of the belt conveyor 34 in the direction of the arrow 35 the following window timbers 58 are conveyed. These are then also by switching on or lowering of the feed rollers 46a grasped by these and conveyed further in the direction of the arrow 57.

Fig. 6 shows an embodiment for an extraction device of a glazing bead which can be separated out. Fig. 7 is the section VIl-VIl in accordance with Fig. 6.

The extraction device 41 consists of a swingable conveying rail 64, which is mounted so as to be swingable at 65 (see Fig. 2) in a horizontal plane in the direction indicated by arrow 62 and receives in itself the glazing bead 60 that has been separated out (see Fig. 7). As emerges from Fig. 7, the conveying rail 64 is at least partially downwardly open. It can be moved by means of a pneumatic unit 61 in the direction of the arrow 62. If the glazing bead 60 is not cut out from the window timber 63, then the conveying rail 64 is conducted out of the region of the milling stop 68 by means of the unit 61. If a glazing bead is cut out, the conveying rail 64 is automatically swung into the position illustrated in Fig. 6, so that the start of the cut-out glazing bead 60 is grasped and the glazing bead is conducted outwardly or by the conveying rail 64 upon a movement of the window timber 63 in the direction of the arrow 66. In this respect, the glazing bead 60 respectively still present in the conveying rail 64 is pushed by the respectively following glazing bead outwards from the conveying rail 64.

Claims (32)

Claims

1. A woodworking machine for the tenoning or tenon cutting and longitudinal profiling of framing timbers, more particularly of window timbers, said machine comprising two tenon cutting and slotting units, arranged one behind the other in the working direction, with respectively a cuttingto-length or cross-cut device, an associated roller table for working of the two end faces of the window timbers and at least one milling unit for the longitudinal profiling, characterised in that arranged directly side-by-side are two tenon cutting and slotting units, working in opposite directions, having cutting-to-length devices and a roller table, with which the window timbers, merely planed on four sides and possibly ground smoothed, can be provided on both end faces with tenons and slots, in which respect provided between the two tenon cutting and slotting units is a conveying device by means of which the window frame provided on its one end face with tenons and slots and without longitudinal profiling is conveyed to the second tenon cutting and slotting unit and in the region thereof against a stop which prescribes the exact end measurement.

2. A woodworking machine as claimed in claim 1, characterised in that various subsequent treatment units, such as milling attachments or devices, glass saws and the like are associated or arranged subsequently in the unit construction system of the entry or input unit.

3. A woodworking machine as claimed in claim 1 or 2, characterised in that two or more window timbers are conveyed parallel side-by-side simultaneously into the input unit are cut to length there simultaneously and provided on both sides with tenons and slots and are then conveyed further transversely to their longitudinal direction.

4. A woodworking machine as claimed in claim 3, characterised in that in each case two identical window timbers are worked and conveyed.

5. A woodworking machine as claimed in any one of claims 1 to 4, characterised in that the stop is an electronically-controlled longitudinallydisplaceable stop which prescribes different lengths from window timber to window timber.

6. A woodworking machine as claimed in claim 5, characterised in that the electronicallycontrolled stop is provided, on its side facing the end surfaces of the window timbers, with a trigger or release for triggering or releasing the roller table which conveys the window timbers past the second of the cutting-to-length device and the second of the tenon cutting and slotting unit in which respect a release is associated with each individual parallel-conveyed window timber.

7. A woodworking machine as claimed in claim 6, characterised in that the releases are so connected that the further conveyance by means of the roller table is triggered only when all the necessary window timbers are disposed at the stop.

8. A woodworking machine as claimed in any one of the preceding claims, characterised in that arranged in the region of the conveying device in front of the roller table of the second tenon cutting and slotting unit is a limit switch by the actuation of which, by means of a window timber running through, the conveying device arranged between the two tenon cutting and slotting units can be switched off in its conveying-in region facing towards the first tenon cutting and slotting unit.

9. A woodworking machine as claimed in claim 8, characterised in that the switching-off is undertaken in that at least a first feed roller, facing towards the following window timbers, of the conveying device is raised.

1 0. A woodworking machine as claimed in claim 8 or 9, characterised in that a further limit switch is provided in the region of the end, facing the first tenon cutting and slotting unit, of the conveying device and is actuatable by a window timber running through, by means of which switch the first roller table is halted before the end position thereof facing towards the conveying device so long as a preceding window timber is still in the region of this limit switch.

11. A woodworking machine as claimed in one of claims 8 to 10, characterised in that the triggers of the stop act upon the clamping device of the second roller table insofar as this is in its end position facing towards the conveying device.

12. A woodworking machine as claimed in one of claims 8 to 11, characterised in that the limit switches and the triggers are known 'per se' capacitive switches.

13. A woodworking machine as claimed in one of the preceding claims, characterised in that a follow-up or re-run table is provided, which, after the running-out of the second roller table out of its end position, follows this as far as into a bridging position which closes the gap between the supporting tables of the conveying device and of the stop and occupies in the bridging position the space thereof.

14. A woodworking machine as claimed in claim 13, characterised in that the follow-up table is forced against the roller table by the force of springs.

1 5. A woodworking machine as claimed in claim 13, characterised in that the follow-up table is forced against the roller table by a cable which is acted upon by a weight.

1 6. A woodworking machine as claimed in one of claims 13 to 15, characterised in that a corresponding or appropriate stop is provided for the respective end position of the follow-up table in the bridging position in which the roller table comes loose from the follow-up table.

17. A woodworking machine as claimed in one of claims 13 to 1 6, characterised in that the stationary stop, absorbing the cutting forces, of the second roller table is arranged on the side, facing towards the tenon cutting and slotting unit in its initial position, of the second roller table and in that the tenon cutting and slotting is effected in synchronism.

1 8. A woodworking machine as claimed in claim 17, characterised in that an additional clamping unit, working parallel to the direction of movement of the roller table, is provided which forces the window timber that is to be worked against the stationary stop of the second roller table.

1 9. A woodworking machine as claimed in claim 18, characterised in that the clamping unit can be acted upon by the triggers of the stop.

20. A woodworking machine as claimed in one of claims 1 to 16, characterised in that a downwardly-swingable stop is provided which, after the underrun of the window timber in the basic position, can be swung up behind the window timber.

21. A woodworking machine as claimed in claim 20, characterised in that a wooden support device and a reversing or change-over device thereof can also be swung down.

22. A woodworking machine as claimed in one of the preceding claims, characterised in that connected subsequent to the input unit is a belt conveyor which establishes the connection between the second tenon cutting and slotting unit and the following further treatment unit.

23. A woodworking machine as claimed in claim 22, characterised in that a stack of the window timbers previously conveyed in parallel is formed on the beltconveyor.

24. A woodworking machine as claimed in claim 23, characterised in that, by grasping of the first window timber and conveying it away by means of the feed unit of the milling or other further treatment unit, the window timbers are separated or singled out between the belt conveyor and the following unit again along with transverse draw-off from the belt conveyor.

25. A woodworking machine as claimed in claim 24, characterised in that provided in the region of the feed unit is a stationary adjustable stop for the respectively following window timbers which holds the respectively following window timber fast until the preceding window timber is conveyed away by means of the feed unit.

26. A woodworking machine as claimed in claim 24 or 25, characterised in that limit switches are provided which switch off or raise the first feed rollers, facing towards the oncoming window timbers, of the feed unit until the preceding window timber has been conveyed away and/or been treated.

27. A woodworking machine as claimed in one of the preceding claims, characterised in that a special conveying-out device for glazing beads is provided.

28. A woodworking machine as claimed in claim 27, characterised in that the conveying-out or extraction device consists of a swingable conveying rail for the glazing beads the commencement end of which is insertable into the glazing bead region.

29. A woodworking machine as claimed in claim 28, characterised in that the conveying rail is substantially downwardly open.

30. A woodworking machine as claimed in claim 28 or 29, characterised in that the conveying rail is conducted out of the region of the milling stop of the milling and glazing bead sawing unit if a glazing bead is not cut out of the window timber.

31. A woodworking machine as claimed in one of claims 28 to 30, characterised in that the respective glazing bead is pushed outwards out of the conveying rail by the respectively following glazing bead.

32. A woodworking machine substantially as hereinbefore described with reference to and as illustrated in Figs. 1,2, 4, 5, 6 and 7, or in Figs. 2, 3, 4, 5, 6 and 7.