EP0679484A1 - Device for manufacturing patches, in particular of wood and for patching resin pockets in wooden workpieces - Google Patents

Abstract

At least one milling cutter (4) is located on a carrier frame (3), and is rotated about a milling axis (5) by a first drive unit (2). The clamp unit (6) for the workpiece is also positioned on the frame, and turnable about a pivot axis (7). A residual part (10) of the workpiece is clamped in the unit, and this turns to move the part past the milling tool. The tool cuts the desired contour (30) into the part. The milling tool has circumferentially positioned cutting elements (29), and these have the contour, which corresponds to the side surface (31,32) of the repair insert (19). <IMAGE>

Description

The present invention relates to a device for producing patches, in particular from wood and for patching resin gall in pieces of wood, according to the preamble of patent claim 1.

Such devices are known. For example, CH-PS 524 440 shows a device for producing resin bile patches from a piece of wood. In the case of this device, the end of a transverse wooden strip is guided past a fillet cutter, which is composed of several milling cutter disks, for the serial production of such patch pieces, so that the shape of the patch pieces can be milled into the end of the transverse wooden strip. The cross bar is guided in a straight line, while the fillet cutter is guided around the end of the cross bar along a template roller, which provides the patches with the appropriate radius. The crossbar is then guided past a separating device, by means of which the milled patch pieces can be separated from the crossbar. After that, the manufacturing process begins again, with the transverse wooden slat being brought into the starting position and advanced by an appropriate amount.

The patching of pieces of wood with appropriate patches is practically only at the respective location of this piece of wood, for example at production locations, on assembly sites or construction sites. For this purpose, the craftsman is equipped with a hand milling device, with which the milling into the piece of wood to be patched is carried out and into which the appropriate patch piece can be glued in and then machined flat.

Since, as mentioned above, the patches are produced in series at the location of the manufacturing facility and since the above-mentioned craftsman has to do with pieces of wood of different types of wood, he leads each time a whole range of pre-produced patches with them, which consist of different types of wood. This means that a patch that was made from the same type of wood can be inserted into the piece of wood.

As is known, however, pieces of wood that are probably of the same type of wood, but in particular come from different plants, can have differences that are striking and result, for example, from color differences and / or different grain.

It is desirable that patch pieces used in this way are not visible in the corresponding pieces of wood. However, this is not optimally achieved because of the differences between the patch pieces and the pieces of wood, even if they belong to the same type of wood. It would be advantageous if the patch piece could be made from a remaining piece of the piece of wood to be patched, but this is practically not feasible with the known devices.

The object of the invention is to provide a device with which a patch of the type mentioned can be made from a remnant of a piece of wood to be patched, this device having the dimensions and the weight of a conventional handset.

According to the invention, this object is achieved by the features specified in the characterizing part of claim 1.

As a result, a device is made available which, thanks to the small dimensions and the low weight, can be taken to a place of use by a craftsman.

Advantageously, a rotating drivable milling tool is provided in this device, which has a contour in the circumferential surface provided with cutting elements, which contour corresponds to a side surface of the patch piece to be machined. This can be done by passing the remaining piece on two opposite sides of the milling tool the respectively desired surface of the patch to be manufactured is milled into the remaining piece.

For this purpose, the tensioning device is advantageously mounted displaceably along the axis of rotation from a first position to a second position, the first position and the second position each being fixed by a stop, one of which is adjustable in order to be able to adjust the thickness of the patch piece. The clamping device is moved using a swivel lever. With this arrangement, it is achieved in a simple manner that both lateral surfaces of the patch piece to be produced can be machined with the same milling tool, the milling tool, which can be driven in rotation, being held stationary with respect to the device.

A further advantageous embodiment of the invention consists in that the remaining piece can be guided past the milling tool in such a way that the surface to be milled is moved past the milling tool in the opposite direction to the direction of rotation. So that the remaining piece is guided past the milling tool in the correct direction, a projection that is firmly connected to the supporting frame is attached in this direction of movement of the remaining piece after the milling tool. This projection means that the remaining piece, if the corresponding surface has not yet been milled, cannot be guided past the milling tool in the opposite direction of movement and consequently in the same direction.

A further advantageous embodiment of the invention consists in that the separating device, consisting of a saw blade which can be driven in rotation via a second drive unit, is fastened to a swivel bracket which can be swiveled about a swivel axis fastened to the support frame. As a result, the patch with the corresponding surface shapes can be separated from the remnant in the same clamping of the remnant.

Further advantageous embodiments of the invention result from the further dependent claims.

An embodiment of the device according to the invention is explained in more detail below by way of example with reference to the accompanying drawing.

• Fig. 1 eine räumliche Darstellung der erfindungsgemässen Einrichtung;
• Fig. 2 eine Ansicht auf eine Schnittdarstellung, wobei der Schnitt in eine Ebene gelegt ist, die durch die Fräsachse und die Drehachse gebildet wird;
• Fig. 3 eine Ansicht von oben, zum Teil im Schnitt, auf die Einrichtung gemäss Fig. 2;
• Fig. 4 eine Ansicht von vorn auf die erfindungsgemässe Einrichtung gemäss Fig. 2 und 3, wobei die Spanneinrichtung aus Übersichtlichkeitsgründen teilweise weggelassen wurde;
• Fig. 5 eine Schnittdarstellung entlang Linie V-V gemäss Fig. 3;
• Fig. 6 eine Ansicht auf die im Schnitt dargestellte Halterung des Schwenkhebels zur Verschiebung der Spanneinrichtung;
• Fig. 7 und Fig. 8 in schematischer Darstellung das Einfräsen der Oberflächenform in das Reststück;
• Fig. 9 eine Ansicht von vorn auf die erfindungsgemässe Einrichtung mit angebrachter Abtrenneinrichtung; und
• Fig. 10 eine Teilschnittdarstellung der erfindungsgemässen Einrichtung, wobei die Abtrenneinrichtung während des Abtrennvorganges dargestellt ist.

It shows:

• 1 shows a spatial representation of the device according to the invention;
• Figure 2 is a view of a sectional view, the section being placed in a plane which is formed by the milling axis and the axis of rotation.
• 3 shows a view from above, partly in section, of the device according to FIG. 2;
• 4 shows a front view of the device according to the invention according to FIGS. 2 and 3, the clamping device being partially omitted for reasons of clarity;
• FIG. 5 shows a sectional illustration along line VV according to FIG. 3;
• Figure 6 is a view of the bracket shown in section of the pivot lever for moving the clamping device.
• 7 and 8 show a schematic representation of the milling of the surface shape into the remnant;
• 9 is a front view of the device according to the invention with the separating device attached; and
• 10 shows a partial sectional view of the device according to the invention, the separating device being shown during the separating process.

The structure of the device 1 according to the invention for producing patches can be seen from the spatial representation according to FIG. 1. This consists of a first drive unit 2, which is held on a support frame 3. This first drive unit 2 drives a milling tool 4 (FIG. 2) rotating about a milling axis 5.

Also held in the support frame 3 is a tensioning device 6 which can be rotated about an axis of rotation 7. Here, the axis of rotation 7 is at right angles to the milling axis 5. The clamping device 6 is equipped with two clamping plates 8 and 9, between which the remaining piece 10 to be milled can be clamped. The clamping plates 8 and 9 can be clamped against each other via a clamping lever 11. The clamping device 6 can be rotated about the axis of rotation 7 by means of a rotating lever 12 which is fixedly connected to the clamping device 6.

The tensioning device 6 can be displaced in the direction of the rotational axis 7 with respect to the supporting frame 3 by means of a pivoting lever 13 which can be pivoted about an axis 14 fastened in the supporting frame 3.

Also attached to the support frame 3 is a swivel bracket 15 which can be swiveled about a swivel axis 16 fastened to the support frame 3. A second drive unit 17 is fastened to the swivel bracket 15, by means of which a saw blade 18 (FIG. 9) can be driven in rotation, and which serves to separate the patch piece 19 (FIG. 10) from the remaining piece 10.

As can be seen from FIG. 2, the tensioning device 6 has a guide pin 20 which is secured against rotation via the pivoting lever 13, but is displaceable in the support frame 3 in the direction of the axis of rotation 7. A first position of the guide pin 20, which corresponds to that as shown in FIG. 2, can be fixed by an adjustable stop 21. Another fixed stop 22, which interacts with a stop surface 23 of the support frame 3, determines the raised second position of the guide pin 20.

A cylindrical opening 24 is coaxially provided in the guide pin 20, into which a pivot pin 25 is inserted, which is passed through the pin 35 fixed in the axial direction, but is rotatable. The clamping plate 9 is fastened to this pivot pin 25.

A mandrel 26, over which a sleeve 27 is slid, which comes to bear against the clamping plate 8, is coaxial to the pivot pin 25 and is firmly connected to it. By turning the clamping lever 11, which is screwed into the mandrel 26 via a thread 51, the sleeve 27 can be displaced with respect to the mandrel 26, whereby the two clamping plates 8 and 9 can be clamped against each other. When the clamping lever 11 is released, the spring 28 arranged between the two clamping plates 8 and 9 causes the clamping plates 8 and 9 to be moved away from one another. The two clamping plates 8 and 9 can be rotated about the axis of rotation 7, guided by the pivot pin 25 in the guide pin 20, via the rotary lever 12.

Between the two clamping plates 8 and 9, which are provided with a recess, a remaining piece 10 can be clamped, which originally has the shape of a cuboid.

To produce a patch 19, the clamping device 6 is rotated about the axis 7 by the rotary lever 12, so that the remaining piece 10 clamped between the clamping plates 8 and 9 is guided past the milling tool 4. This milling tool 4 has cutting elements 29 which are arranged in the peripheral surface of the milling tool 4. The cutting elements 29 are provided with a contour 30 which corresponds to the machining side surfaces 31 and 32 of the patch piece 19 to be attached.

To produce a patch 19, the tensioning device 6 is brought into a first position via the pivot lever 13 (FIG. 1), which is shown in FIG. 7 and is designated by reference number 33. The stop 22 abuts the stop surface 23 (FIG. 2). By means of the rotating lever 12, the remaining piece 10 is now guided past the milling tool 4, as a result of which the lateral surface 32 is milled into the remaining piece 10. After this milling process has been completed, the clamping device 6 is brought into a second position via the pivot lever 13, which is shown in broken lines in FIG. 7 and is provided with the reference number 34. In this second position, the guide pin pushes 20 to the set stop 21 (Fig. 2). With the change in the setting of the stop 21, the thickness of the patch piece 19 can be changed. Then, by rotating the clamping device 6 with the rotary lever 12 about the axis of rotation 7, the clamped-in remnant 10 'is guided past the milling tool 4, on the other side of the milling tool 4, so that the lateral surface 31 is milled into the remnant 10'.

In the top view according to FIG. 3, the shape of the remaining piece 10 is shown with solid lines when it has completed the two milling processes described above. The outer edge of this remaining piece 10 has a circular shape with a radius, this radius essentially corresponding to the radius of the milling cutter of the hand milling apparatus, with which the craftsman carries out the milling into the piece of wood to be mended.

The rotatability of the tensioning device 6 with respect to the support frame 3 can be blocked in a predetermined position by a locking device 36. This locking device 36 consists, as can be seen from FIG. 3 and in detail from FIG. 5, of a pin 38 inserted into a bore 37 which is let into the support frame 3 and which is spring-supported by a spring 39. A stud screw 40, which is screwed into the support frame 3 and whose front end projects into a guide groove of the pin 38, prevents the pin 38 from falling out. When the position of the clamping device 6 shown in FIG. 3 is reached, the pin 38 penetrates a corresponding opening of the clamping plate 9, whereby the rotatability is blocked. This blocking position is reached when the remaining piece 10 clamped in the clamping device 6 is opposite the milling tool 4. In this blocked position, on the one hand, the tensioning lever 11 can be actuated without problems for clamping and unclamping the remaining piece 10, but furthermore the separating operation of the patch piece 19 from the remaining piece 10 can also be carried out by the separating device 15, 17, 18, as will be described later . In order to be able to release the clamping device 6 from this blocked position, it is simply raised via the swivel lever 13.

As can be seen from FIG. 4, a projection 41 or 42, which is fixedly connected to the supporting frame 3, is attached to both sides of the milling tool 4. The remaining piece 10 to be milled, which is clamped in the clamping device 6, is to be guided past the rotating milling tool 4 in such a way that in each case the passing movement is opposite to the direction of rotation of the milling tool 4. In order to prevent machining of the remaining piece 10 in the synchronous movement, the two projections 41 and 42 are attached. If the remaining piece 10 is still unprocessed and has the shape of a cuboid, the remaining piece 10 according to FIG. 4 can only be moved against the milling tool 4 from the side of the projection 42 and above it, the remaining piece 10 would be from the other side Projection 41 are pending, whereby only the counter-rotating movement is permitted. If the lateral surface 32 is milled into the remaining piece 10, this can be guided past the projection 41. Conversely, the lateral surface 31 is milled. In this case, the remnant 10 must be fed from the side of the projection 41 and below it to the milling tool 4, because the projection 42 prevents this movement from the other side.

This aspect is also shown in FIG. 8. While the remaining piece held by the clamping plates 8 and 9 can be guided past the milling tool 4 in the direction of the arrow 43, since the projection 41 is only run over after the milling has been carried out, the remaining piece 10 'shown in broken lines would result in a counter-moving movement, as is the case with the crossed-out arrow 44 is shown, with its corners on the projection 41.

As can also be seen from FIG. 4, the adjustable stop 21 can be provided in a known manner with a scale by means of which the stop and consequently the thickness of the patch piece 19 to be produced can be preset. Furthermore, it can be seen from FIG. 4 that the milling tool 4 is accommodated in a space 46 formed by the support frame 3 and a protective cover 45, thereby eliminating the risk of injury to an operator of this device. Furthermore, a connection piece 47 is arranged on the support frame 3, one in the space 46 has opening 48 and to which a suction hose, not shown, can be connected, which is connected to a known suction device, not shown. This means that the chips generated during the milling process can be extracted.

As can be seen from FIG. 6, the swivel lever 13 can be swiveled about an axis 14 fastened in the support frame 3 for displacing the tensioning device 6. Here, one end of the pivot lever 13 is coupled to the guide pin 20 of the tensioning device 6, while the other end of the pivot lever 13 is designed as a handle 52.

To separate the patch piece 19 from the remaining piece 10, the device 1 has a separating device, which is shown in FIGS. 9 and 10. The swivel bracket 15 is fastened to the support frame 3 so that it can swivel about the swivel axis 16.

At the end facing away from the pivot axis 16, the second drive unit 17 is fastened to the pivot bracket 15. This second drive unit 17 rotates the saw blade 18, which rotates about the saw blade axis 49.

This separating device 15, 17, 18 is pivoted away from the area during the milling of the remaining piece 10, as can be seen from FIG. 9. This end position is limited in a known manner, not shown, by a stop. If the shape of the patch piece 19 is now milled into the remaining piece 10, the clamping device 6 is brought into the position in which the pin 38 of the locking device 36 locks this clamping device 6. Thereafter, the separating device 15, 17, 18 can be pivoted in front of the tensioning device 6, as shown in FIG. 9, until the saw blade 18 assumes the position 18 'shown by the dash-dotted line. During this pivoting process, the rotating saw blade 18 separates the patch piece 19 from the remaining piece 10 held in the tensioning device 6, as can be seen in particular from FIG. 10. This patch piece 19 can then be inserted in a known manner into the piece of wood to be patched, provided with the corresponding cutout, whereby a fit is guaranteed and after the plan processing of the patch piece used this is because of this the match of color and grain is practically no longer visible. After the patch piece 19 has been separated, the remaining piece 10 can be removed from the tensioning device 6, after which a further patch piece could be produced.

The support frame 3 can easily be attached to a base plate 50 (FIGS. 1 and 2), which base plate 50 can be provided in a known manner with a screw device with which the device 1 could be attached to a table.

With this device 1, the craftsman can produce patch pieces 19 at his place of use, which he produces from a remaining piece 10, which he can separate from the piece of wood to be patched. This is made possible by the compact structure of this device, the small dimensions and a weight that corresponds to a conventional handset.

Claims (10)

Device for the production of patches, in particular made of wood and for patching resin gall in pieces of wood, consisting of a milling device for attaching the outer shape of the patch to a workpiece, a clamping device for holding the workpiece and a separating device for separating the patched piece from the workpiece , characterized in that at least one milling tool (4) which can be driven in rotation about a milling axis (5) by a first drive unit (2) is held on a supporting frame (3) such that the clamping direction (6) can be rotated about an axis of rotation (7) on the Support frame (3) is attached, in which a remnant (10) of the workpiece can be clamped and by rotating about the axis of rotation (7) past the milling tool or milling tools (4), while in the remnant (10) that of a contour (30) of the milling tool (4) corresponding surface shape is milled. Device according to claim 1, characterized in that a rotating drivable milling tool (4) is provided which has cutting elements (29) which are arranged in the peripheral surface of the milling tool (4) and which have the contour (30) which corresponds to a lateral surface to be machined ( 31, 32) of the patch piece (19), and that the axis of rotation (7) of the tensioning device (6) is substantially perpendicular to the milling axis (5), that the one lateral surface (31) of the patch piece (19) when passing a Side of the milling tool (4) can be milled, and the other side surface (32) of the patch piece (19) can be milled when it is guided past the other side of the milling tool (4). Device according to claim 2, characterized in that the milling axis (5) is stationary with respect to the supporting frame (3), while the clamping device (6) can be displaced along the axis of rotation (7) from a first position (33) to a second position (34) and vice versa, the clamping device (6) being in the first layer (33) when milling one side surface (32) and in the second layer (34) when milling the other side surface (31). Device according to claim 3, characterized in that the first layer (33) and the second layer (34) are each defined by a stop (21) or (22), at least one of these two stops (21) being adjustable, and that the tensioning device (6) is displaced via a pivoting lever (13) which can be pivoted about an axis (14) fastened in the supporting frame (3), one end of which is coupled to the tensioning device (6) and the other end of which is used as a handle ( 52) is formed. Device according to one of claims 1 to 4, characterized in that the rotation of the clamping device (6) about the axis of rotation (7) can be carried out by means of a rotating lever (12) which is fixedly connected to the clamping device (6), and that at least one The rotational position can be fixed by a releasable locking device (36). Device according to one of claims 2 to 5, characterized in that the remaining piece (19) can be guided past the milling tool (4) in such a way that the surface to be milled is moved in opposite directions to the direction of rotation of the milling tool (4), and that in Direction of movement of the remaining piece (19) after the milling tool (4) a fixedly connected to the support frame (3) projection (41) or (42) is attached, which leads a non-milled surface past the milling tool (4) in the same direction prevented. Device according to one of claims 1 to 6, characterized in that the support frame (3) is releasably attachable to a table by means of a tensionable holding device. Device according to one of claims 1 to 7, characterized in that the milling tool (4) is surrounded by a protective cover (45), and that a connecting piece (47) is provided on the support frame (3), on which a suction hose for suctioning chips from a space (46) formed by the support frame (3) and the protective cover (45). Device according to one of claims 1 to 8, characterized in that the separating device (15, 17, 18) consists of a saw blade (18) which can be driven in rotation by means of a second drive unit (17) and which are fastened to a swivel bracket (15) which can be pivoted about a pivot axis (16) fastened to the supporting frame (3), and that the saw blade (18) can be guided past the tensioning device (6) by the pivoting movement, so that the patch piece (19) with the corresponding surface shapes from the rest piece (10) is separated. Device according to claim 9, characterized in that during the separation process of the patch (19) from the remnant (10) the clamping device (6) with the clamped remnant (10) is in the rotational position, which can be fixed by the releasable locking device (36) .

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