DE2056920A1 - Method and device for preparing workpieces for producing finger joint connections, in particular for windows, doors and other frames - Google Patents

Description

Method and device for preparing workpieces for manufacture of finger joint connections, especially for window, door and other frames The invention relates to a method for preparing workpieces for production of finger joint connections, especially for window, door and other frames, where the work piece and a rotating cutter head are used to attach the finger joints are moved relative to each other.

For some years now there has been more and more of this instead of earlier common end timber connections, such as overlaps or finger joints of great length, finger joint joints with numerous and very short tines. Save such connections compared to the previous designs a lot of material and ensure if the tines are manufactured with great precision, high strength values for the joint. The small dimensions such finger joints thus require great accuracy when creating. So those with finger joints will be beneficial too Sealed surfaces are precisely dressed prior to milling the finger joints.

It is known from OS 1 800 469 to be provided with finger joints Clamping workpieces on a machine table with a cutter head in one Straight guidance from Ifand can be guided along the end of the work piece to be machined is or by turning a table part of the cutter head and the ends of the Workpieces are movable relative to one another on a circular arc line. This well-known Method is only part of a process with which workpieces are used for finger joint connections to get prepared. The precise dressing of the end faces to be finger-jointed must be done elsewhere1 before the workpieces are placed on the known machine table be clamped. After the finger joints have been milled, the workpieces must be removed can be coated with glue at another workstation and can then are first fed to a connection point. This means a considerable effort in terms of working time and labor. Working with the from the becomes even more cumbersome OS known device when the workpieces to be connected to each other approximately should be processed at the same time. For an exact connection it is necessary that the finger joints of one workpiece compared to those of the other workpiece are offset. OS 1 800 469 provides for either both workpieces at the same time to be clamped and machined with a milling cutter feed, followed by a Workpiece must be drawn around 1800. The clamping device for one of the two Work pieces must then be aligned 1 so that it is half the width of the tine higher than the other. If the turning of the workpiece is to be avoided, the Workpieces are clamped one after the other and each time the one that determines the working height Stop can be changed.

In any case, it takes a lot of time to find two matching ones Workpieces can be brought to be glued. This working time increases considerable for frame parts that have to be finger-jointed at both ends, again taking into account the offset in relation to another workpiece be required, although confusion may occur. It is also used for turning long workpieces require a lot of space.

The object of the invention is to provide a method of the type described at the outset To create a way that enables a connection press in a quick and rational way to deliver ready-made workpieces to be joined together.

The object is achieved according to the invention in that the workpiece automatically shifted parallel to the intended direction of its first end face, one after the other its first face is finger-jointed, then on it the workpiece is transported further in its longitudinal direction, then in the provided direction of its second end face moved further and thereby the second Provide the front face with 1 prongs at a specified length distance from the first one and then coated with @eim.

In this procedure, the necessary preparatory work is both temporally and spatially closely summarized and run continuously. From it there is a considerable saving of space and time. Furthermore allowed a Such a process requires extensive automation, additional working hours and Above all, it saves operators.

There are no difficulties in this workflow m (jgl me, die to provide both ends of the workpiece with mutually offset prongs. Because only When one end is coated with glue, two workpieces that have been prepared one after the other are made inevitably the matching, i.e. different, ones without risk of confusion Ends connected. Attaching the second end face at a predetermined length distance moreover ensures compliance with specified dimensions and enables continuous Manufacture of rectangular frames of non-square norm as well.

For workpieces to be joined with a miter, the end faces machined to the workpiece at a miter angle to its longitudinal extension will. This means that when moving parallel to the direction of its end face the workpiece is moved at an angle α to its longitudinal extension.

Each end face can advantageously first be preprocessed when it is moved and then finger-jointed.

I) The pre-machining of the end face makes it possible for the dovetail milling only a very small depth of the workpiece has to be machined, whereby the Cutter head is protected.

In the case of workpieces to be joined with a miter, these can be used in their original shape, for example with transverse to the longitudinal direction Endflaciien are given in the operation. During the preparatory work cn, the Edging angles machined, for example by machining.

Before the second cutter head, the excess Length taken away.

In addition, the workpiece can be moved in its longitudinal direction during transport be provided with an additional longitudinal profile. This means a further rationalization when producing window frames or the like that require such a longitudinal profile, as there is no need for a separate work process before attaching the finger joints.

The invention also provides an apparatus for performing the inventive method Procedure. It has two sliding devices with holding elements for the tool, a conveyor device for the transport between the two displacement devices, at least one rotating cutter head in the range of motion of each displacement device and a glue application device in the end region of the path of the second displacement device on. This means that there are all the workplaces required to prepare a workpiece arranged in a relatively small space and a rapid1 continuous conveyance of the Workpiece guaranteed. A particular advantage of this device is in it see that the workpiece does not need to be turned anywhere. When the finger joint takes place butt, i.e. the end surface to be provided with teeth perpendicular to the longitudinal direction of the workpiece runs, so the two displacement devices can each other run parallel, so the workpiece go through a U-displacement movement. In this Case can be equipped with a single cutter head, the device between the paths of the shifting devices is arranged. This becomes the workpiece at the working hoof the first displacement device initially with its first end face guided along the first cutter head and then provided with finger teeth1 transported to the second shifting tool and from this with its second Front face moved along the cutter head. The necessary relocation of the tines the second end face opposite those of the first end face is by a corresponding l difference between the two shifting devices in a simple manner aim.

If pre-machining of the end faces is desired or necessary, a preprocessing tool can favorably be used in the range of motion of each displacement direction, namely be arranged in the direction of the working stroke in front of the cutter head. The workflow takes place - thus just as continuously as without preparatory work. It's not necessary, Prepare the workpiece elsewhere, for example the miter itself cut. The device according to the invention thus works with a small footprint and great economy.

The device can advantageously have two preprocessing tools and two cutter heads, one of them one after the other in the range of motion of a displacement device arranged, have. The arrangement of two cutter heads allows the trajectory of the second displacement device at any distance from that of the first displacement device to arrange.

This creates space for further facilities between the two lanes, for example for a profiling device1 on which the workpiece during the Intermediate transport by the conveyor still with a Longitudinal profile is provided. In addition, the two shifting devices in be arranged in one plane, while the tine offset by the different level adjustment of the tools is achieved.

In a preferred embodiment of the invention sgeuiäß en device are the Verschiebeinri chtirngen so simultaneously movable with each other that one performs a working stroke and the other completes its empty return. In order to the time for loading the first shifting device falls over time for removing the prepared workpiece from the second displacement device together, resulting in a fluid and, moreover, easy to centrally control workflow results.

For workpieces that are to be joined together with a miter, the sliding devices can be positioned at a miter angle corresponding to the miter angle Angle inclined to the direction of movement of the contact surface for the long side of the workpiece and the path for the conveyor between the displacement devices also run at this angle. No separate work process is required in order to give the workpiece in front of the device an inclined face. That The workpiece passes through the device just as quickly and easily as it was above for a workpiece with partial end faces perpendicular to its longitudinal direction is. The prepared workpieces leaving the device one after the other can are pressed together directly with a miter, with no fitting difficulties appear. A particularly short way to work of the workpiece in the device results from the fact that the two shifters in the right Angle to each other are movable.

On the second shifting device, a desired one can be added Workpiece length be arranged inge adjustable length stop. When preprocessing of the second end face, the workpiece is shortened to the intended length.

The length stop is advantageous for adjusting an electronic one Assigned control device. It enables the stop position to be changed quickly. It can therefore not only be of the same length, but also for a length of time immediately one after the other and short workpieces leave the device, i.e. parts that are not square Frame belong. This means that such frames can also be glued together continuously immediately after preparing the parts. The control device can be assigned a manual switch to intervene in the automatic sequence. He enables one or more workpieces of a certain length to be produced outside of the currently running length program.

The conveyor device can have a number of drivable conveyor rollers, at least the first of which can be lifted the first sliding movement get under this role or roles unhindered. This role or roles is one with the jig of the first Associated with the carriage, for example hydraulically, coupled lifting device, that the roller or cleat lower itself onto the workpiece as soon as the clamping device is takes off.

Can be advantageous for triggering the working stroke of the second slide a switching device cooperating with the last conveyor roller of the conveyor device be provided. The device itself ensures a continuous workflow. In a preferred embodiment, the last conveyor roller is the conveyor device arranged axially displaceable by a small distance and the switching device can be actuated by the axial displacement. This can be done in an economically simple manner can be achieved in that the last conveyor roller can be driven via a slip clutch and is axially displaceable.

The slip clutch of a favorable embodiment has two cooperating Ball cages with balls on, one with the last conveyor roller, the other is connected to a drive. As long as the last conveyor roller is unhindered moves, be it in idle mode or when conveying a workpiece from the first to the second displacement device, the balls of both ball cages work together.

However, as soon as the conveyed workpiece hits the length stop, the last conveyor roller is stopped. The balls of the connected to the drive Ball cage then slide over the balls of the ball bearing stopped with the roller and force an axial displacement. This has the advantage that it is still under workpiece located on the roll with its long side securely to the corresponding Contact surface of the second displacement device is pushed.

On the other hand, it is sufficient to move the roller axially via a spring-loaded one Ifebelsystem to set the sliding devices in motion with a contactor.

A control device is advantageous for the entire workflow the device according to the invention provided.

It allows finger joint connections to be made quickly and economically in large numbers and with constant precision.

The inventive method is then based on one in Drawing illustrated embodiment of a device explained. Show it: Fig. 1 is a plan view of a device for preparing workpieces for a Finger joint connection, FIG. 2 shows the device according to FIG. 1 in a side view, 3 shows the side view of a prepared workpiece, FIG. 4 shows parts of two prepared workpiece Workpieces before their connection, FIG. 5 shows a finger joint from the workpieces According to FIG. 4, FIG. 6 an enlarged detail partially cut, and FIG. 7 the Detail of Fig. 6 seen from above.

1 shows the device for preparing workpieces 1 for a finger joint with miter in a somewhat schematic form and in two working positions. It has a first displacement device 2 in the form of a Slide on, which is arranged to be displaceable in the direction of the double arrow A on guide 3 is. The carriage 2 has a contact surface 4, which is below the direction of displacement runs at an angle oC = 450, which corresponds to the miter angle. Above the sled 2 is a clamping device 5 with two vertically movable pressure pistons 5a which can also be displaced arranged. The slide 2 also has a drive 6.

The device also has a second displacement device in Shape of a carriage 2a on 1 which is perpendicular to the first carriage 2 in the direction of the double arrow B is arranged displaceably on ijhrungen 3a. He corresponds with a contact surface 4a, a clamping device 5a and a drive 6a in the essential of the first displacement device. In addition, its mooring area 1l an adjustable Längenansclllag 7 assigned, which in Fig. 1 in two different Positions is indicated. The two displacement devices 2 and 2a are shown in Fig. 1 shown in solid lines in its one end position and without the others Devices in dash-dotted lines in their second end position. The function these end positions will be explained below using a machining process.

In addition to the displacement path of the first slide, there are one next to the other about a vertical axis drivable chipper disc 8 and also a arranged vertical axis drivable cutter head 9 for the milling of finger joints.

In addition to the displacement path of the second carriage 2a are located next to each other another chipper disk 8a, another cutter head 9a and a glue application device 10.

A conveyor 11 with conveyor rollers 11a is on the device arranged so that it is located between the two carriages 2 and 2a when they are in their second end position. Your conveying direction C runs at an angle of 450 to the displacement directions A or

B of the two carriages, i.e. parallel to the contact surfaces 4 or 4a. It has a drive motor 11b on its first two conveyor rollers 11a can be raised and lowered by means of a lifting device 14. The lifting device 14 is such with the clamping device 5 of the first carriage coupled that when they are released a lowering ir lifting device takes place.

Another detail of the conveying device 11 is shown in FIG. 1 for reasons of clarity is not shown, is shown on a larger scale in FIGS. The last remaining with the workpiece in attack conveyor roller 11a 'has its own drive 15, which has a slip clutch 16 on the conveyor roller lla 'works. The clutch coupling 16 has a ball cage firmly connected to it 17 with balls 17a and a ball cage 18 attached to the conveyor roller 11a ' Balls 18a aiif. A compression spring 19 loads the slip clutch in such a way that move the balls 17a and 18a side by side with an overlap a of their diameter. The drive 15 is mounted on an arm of a lever 20 which rotates about a pivot axis 21 is movable. The other arm of the lever 20 is coupled to a tension spring 22, which loads the drive 15 on the slip clutch 16. That arm carries you Contactor 23 for a switch 24. The mode of operation of this arrangement is as follows: In idle mode and while a workpiece is being conveyed within the scope of what will be described later During the processing sequence, the roller 11a 'is transferred from the drive 15 via the slip clutch 16 normally driven. However, as soon as a promoted by the conveyor 11 Workpiece 1 arrives on the slide 2A at the length stop 7, that is to say in his Movement is stopped, even that in this position with the workpiece still heals engaged role lla 'on. I) he drive 15 is effective Further. As a result, the balls 17a and 18a run over one another.

There is an axial displacement of the roller 11a 'by approximately the length of the overlap a forced in the direction of arrow it D in FIG. This distance is about 2.5 mm. By the action of the tension spring 22, the lever 20 is pivoted and thus the Contactor 23 pressed against switch 24.

In the exemplary embodiment, a leverage ratio of approximately 1: 3 is provided. This is sufficient to operate the switch 24, which sets the carriage drive in motion, as shown in the following workflow.

The entire device is a control device indicated in FIG 12 assigned, which regulates the workflow automatically.

With the device shown, the workpiece 1, here as a wooden strip shown with end faces perpendicular to its longitudinal expansion, in the following way Prepared for a finger joint with a miter: Carriages 2 and 2a are in their first end position.

For the carriage 2a, this corresponds to its receiving position, in which the workpiece 1 is fed to him. The position of the workpiece 1 is determined by the contact surface 4 and a stop 13 arranged on the device, on which one end of the Werkitückes is created, determined. The stop 13 is adjustable so that the With different wood widths, different cutting allowances must be taken into account can.

The clamping device 5 comes into action and holds the workpiece 1 in this position on the carriage 2.

Then both sledges start moving in the direction of hers second, dash-dotted end position.

This movement sets the working stroke of the slide 2 and the empty one Return movement of the carriage 2a. The carriage 2 moves the workpiece the chipper disc 8 over, which has a first face at the miter angle Milling $ = 45 on the workpiece. The workpiece becomes with this first end face 1 moves past the cutter head 9 with further advance, which is the first end face provided with finger joints.

When the two slides have reached their second end position, align their contact surfaces 4 and 4a with one another. The jig 5 gives the workpiece 1 is free and the conveyor 11 comes into operation. She overshoots the workpiece from the carriage 2 to the carriage 2a, where its position from the contact surface 4a and the length stop 7 is determined. In this position, the jig is used 5a clamped.

Now both carriages are in the opposite direction, namely from its second end position in the first end position, by the switch 24 in motion set. This movement corresponds to the empty return of the carriage 2 and the Working stroke of the slide 2a. This now moves the second end of the work piece 1 first past the chipper disc 8a, which is in the by the length stop 7 predetermined distance from the first end face below a second end face Pre-cut miter. The second end face is then at the cutter head 9a small chip removal provided with finger joints, whereby by a suitable height arrangement between the workpiece 1 and the cutter head 9a is achieved that the tine arrangement on the second end face opposite the prong arrangement the first face is offset by half a Zinkel width. Finally, the second end face moved past the glue application device 10 and with it there Glue coated. As soon as the two carriages have reached their first end position again the prepared workpiece can be removed and transferred directly to the be connected before or after the finished workpiece. At the same time can resending of the carriage 2 take place.

Fig. 3 shows a completely prepared workpiece 1 with finger joints its two end faces sloping at an angle. Figs. 3 and 4 illustrate in perspective the formation of two end faces to be connected and the finished connection. The workpieces according to FIGS. 3 to 5 are for window frames determined and have a stepped longitudinal profile. The milling of this longitudinal profile can during the feed movement of the workpiece caused by the conveying device 11 by one which is not shown in FIGS. 1 and 2 for reasons of clarity Profiling device take place.

The invention is not limited to the embodiment of the device and restricts the thereby determined workflow.

In the context of the invention, the device can also be designed so that only one end face is machined.

For workpieces that are to be butt-connected by quick joints, the second slide can be arranged displaceably parallel to the first slide and the conveying device is designed conveying at right angles to both St n. That There is no need to apply glue. For finger joint connections at an angle other than a right angle, the contact surfaces can correspondingly be adjustable.

Instead of cutting discs for dressing the end faces you can cross-cut saws or similar dressing devices can also be provided.

The method and device are not limited to workpieces made of wood. All materials that can be glued, such as plastics and aluminum, can also be treated will.

Furthermore, the device can be controlled synchronously with her transport be assigned to facilities that the loading of workpieces and the removal take over finished workpieces automatically.

Claims (26)

Patent claims 1. Process for preparing workpieces for the production of finger joint connections, especially for windows, doors and other frames, whereby for attaching the finger joints the workpiece and a rotating cutter head are moved relative to one another, thereby it is noted that the workpiece 1 is automatically parallel to the intended Moved towards its first face, while its first face with Finger-jointing is provided so that the workpiece continues in its longitudinal direction transported, then in the intended direction of its second end face moved further and the second end face at a predetermined length to the first finger-jointed and finally coated with glue. 2. The method according to claim 1 for mitred workpiece to be connected in that the end faces are attached to the workpiece in one Miter angle g (to be worked on for its longitudinal extension. 3. The method according to claim 2, characterized in that g e k e n n z e i c h -n e t that each face is first pre-machined when moving and then is provided with finger joints. 4. The method according to at least one of claims 1 to 3, characterized it is not indicated that the workpiece is being transported in the longitudinal direction is provided with an additional longitudinal profile. 5. Apparatus for the method at least according to claim 1, characterized it is not indicated that they have two displacement devices (28 or (2a) with holding elements (5) or (5a) for the workpiece (1), a conveyor device (11) for the transport between the two displacement devices (2) and (2a), at least a rotating cutter head (9) in the range of motion of each displacement device and a glue application device in the end region of the path of the second displacement device (2a) (10). 6. Apparatus according to claim 5, characterized g e k e n nz e i c h n e t that at least one preprocessing tool (8) or (8a) in the range of motion each displacement device (2) or (2a) in the direction of the working stroke is arranged in front of the cutter head (9) or (9a). 7. Apparatus according to claim 6, characterized in that g s k e n n -z e i c h n e t that they have two preprocessing tools (8) or (8a) and two cutter heads (9) bsw. (9a) in each case one of them one after the other in the movement area of a handling device (2) or (2a) arranged. 8. Apparatus according to claim 7, characterized in that g e k e n n -z e i c h n c t 9 that the preprocessing tools (8) or (as rotiorendo cutting discs are trained. 9. Device according to at least one of claims 4 to 8, characterized G e k e n n n n z e i c h n e t that the displacement devices (2) or (2a) in such a way are movable with each other at the same time, that the one a working stroke and the other carries out its empty return. 10. The device according to at least one of claims 4 to 9, characterized it is noted that the displacement devices (2) and (2a) under contact surfaces running at an angle α obliquely to the displacement device (A) or (B) (4) or (4a) for the long side of the workpiece (1) and the conveying direction (C) the conveyor (11) between the shifting devices also below the angle runs. 11. The device according to at least one of claims 4 to 10, characterized it is noted that the two displacement devices (2) and (2a) are movable at right angles to each other. 12. The device according to at least one of claims 4 to 11, characterized g e k e n n n n z e i c h n e t that on the second displacement device (2a) a length stop (7) adjustable according to the desired workpiece length is. 13. The apparatus of claim 12, characterized in that g 0 k e n s -z e i c h n e t that the length stop (7) to adjust an electronically. Control device assigned. 14. The device according to claim 13, characterized in that g e k e n n -z e i c h n e t that the control device has a hand switch to intervene in the automatic Sequence is assigned. 15. Device according to at least one of claims 4 to 14, characterized it is noted that the displacement devices (2) and (2a) as Carriages with clamping devices (5) are designed as holders. 16. The device according to at least one of claims 4 to 15, characterized it is noted that the conveyor device (11) has a number of drivable Has conveyor rollers (lla), of which at least the first can be raised. 17. The device according to claim 16, characterized in that g e k e n n -z e i c h n e t that the liftable conveyor roller or rollers one with the jig (5) of the first carriage (2) coupled lifting device (14) is assigned. 18. Device according to at least one of claims 4 to 17, thereby it is not noted that for the triggering of the working stroke of the second Carriage (2) one with the last conveyor roller (lla ') of the conveyor (11) cooperating switching device (20 bus 24) is provided. 19. The device according to claim 18, characterized in that g e k e n n -z e i c h n e t that the last conveyor roller (lla ') of the conveyor (11) by a small one Line (a) is axially displaceable and the switching device (20 to 24) can be actuated by the axial displacement. 20. The device according to claim 19, characterized in that g e k e n n -z e i c h ne t that the last conveyor roller (yes') can be driven via a slip clutch (16) and is axially displaceable. 21. The device according to claim 20, characterized in that it is e k e n n -z e i c h n e t that the slip clutch (16) has two interacting ball cages (17) and (18) with balls (17a) and (18a), one of which (18) with the last conveyor roller (11a ') and their other (17) is firmly connected to the slip clutch (16). -22. Device according to at least one of Claims 18 to 21, characterized it is noted that the switching device is essentially a spring-loaded one Ilebelsystem (20 to 22) is formed with a contactor (23). 23. The device according to at least one of claims 4 to 22, characterized it is noted that in the area of the first end position of the first slide (2) a stop (13) for the end of the to be provided with the first end face Workpiece (1) is arranged. 24. The device according to claim 23, characterized in that it is n -z e i c h n e t that the stop (13) can be adjusted to set cutting allowances. 25. Device according to at least one of claims 4 to 24, thereby it is noted that there is one in the range of motion of the conveyor (11) has arranged profiling device. 26. The device according to at least one of claims 4 to 25, characterized it is noted that you have a control device (12) for the whole Workflow is assigned.