EP0830922B1 - Machine tool with sawing device, in particular for machining panels - Google Patents

Description

The invention relates to a machine tool of the kind specified in the preamble of claim.

A machine tool of the aforementioned type is primarily a so-called machining center with a work spindle arranged on the projecting support, which has a tool holder with a rotary and a swivel drive. Different tools from a tool magazine can be inserted into the tool holder of the work spindle. These are mainly cutting tools, such as milling tools in particular, which only require a rotary drive. In addition, the sawing device, the circular saw blade of which has to be driven in rotation, can be accommodated by the tool holder of the work spindle. So that cuts can be made in different directions in the X-Y plane with the sawing device, the tool holder of the work spindle additionally has a swivel drive, via which the plane of the circular saw blade of the sawing device can be rotated.

With known machine tools of this type, the plates accommodated on the clamping table can be divided, these plates having a format which must not exceed that of the clamping table. Consequently, such a machine tool can only handle plates of a smaller format that have previously been cut on an upstream dividing saw.

From the utility model DE 80 33 805 U1, which is regarded as the closest prior art, a machine is known with a saw portal spanning a rotatable work table, on which a processing device with a work shaft is arranged, which is equipped with a drill, a milling cutter or the like can be equipped. Not only can trimming and dividing cuts be made on the workpieces transferred to the workpiece table, the workpieces can also be machined in other ways. The saw on the known machine is a cross saw arranged on the saw portal, the cutting length of which is limited to the width of the work table. The width of the workpieces to be machined is therefore limited to the width of the workpiece table. The known machine is not intended for dividing workpieces in a suitable format from a large-format starting plate.

A table saw is known from document US Pat. No. 4,640,326, which has a support device in front of the saw table when viewed in the workpiece feed direction. This support device, which is level with the saw table, makes it possible to rest and guide long workpieces, in particular boards, in the feed direction on the table saw. The direction of the cutting line always coincides with the direction of the longitudinal extension of the workpieces.

The invention has for its object to provide a machine tool of the type mentioned, with the large section of plates that are wider in the starting position than the clamping table of the machine, the plate section to be processed can be separated. This object is achieved in a machine tool of the generic type according to the invention by the characterizing features of patent claim 1.

For the invention, it is essential to be able to place a large-format plate on the support device, which is then pushed by hand or by machine to the clamping table in order to be able to make a cut with a milling unit and / or the sawing device, with which the cut can be performed in one work cycle is separated from the machine tool plate section. Cuts with a milling cutter or with a milling unit are primarily chosen if the respective cutting line does not run in a straight line from one end of the plate to the other. Conversely, with a continuous cutting line in the X direction of the machine, saw cuts are possible. It is thus with the invention Machine possible to separate corner sections from the large-format panel, for example, whereby the respective cutting line can be traversed by the milling unit or the sawing device, even if the sectional patterns of the individual blanks are nested in one another, by appropriate infeed or by turning the panel in its plane. For this purpose, the movability of the support with the sawing device attached to it is used in the direction of the X-axis of the machine, and accordingly the plane of the saw blade of the sawing device is aligned with the X-direction. The milling units and the sawing device can be arranged directly on the respective support; on the other hand, there is the possibility of changing the required milling cutter or the sawing device into a tool holder of a work spindle arranged on the support.

It is advantageous if the clamping table of the machine tool is equipped with suction clamps which are arranged on cross-beams which are adjustable in the direction of the X-axis and are displaceable on these cross-beams in the direction of the Y-axis. Thus, these suction clamps can be positioned on both sides of the cutting line, both below the plate section to be separated and the adjacent section of the remaining plate, which is subsequently returned to the support device.

So that the entire plate and in particular the plate section to be separated from it can be precisely aligned in the working area of the machine tool, a stop device is provided on the side remote from the support device above the clamping table, which is in its working position at the level of the striking plate narrow surface side. In the The stop device can be a stop ruler that can be positioned in the direction of the Y axis of the machine. It is particularly advantageous to arrange the stop device on the support of the machine, provided that this can be moved in the direction of the Y axis, in particular has a Y support that can be moved in the Y axis. Since machines of the type in question are generally program-controlled, the required position of the stop device can be specified by the program control. In this case, the cutting line running in the X direction can always be placed on the same Y coordinate when dividing the plate section to be separated, so that the suction clamps supporting the plate on both sides of the cutting line can also always remain in the same position during the cutting process.

So that the stop device on the Y support does not interfere with the working area of the machine during the machining operations, it is designed to be height-adjustable, that is to say it can be moved in the usual Z direction of the machine. In an expedient embodiment, the stop device has two height-adjustable stop bolts which are arranged at a suitable distance from one another.

So that the large-format plate can be safely aligned when it is transferred from the support device to the clamping table, an X-stop which can be lowered from its support plane is also arranged in the region of the clamping table. The plate section to be transferred to the clamping table and to be separated can thus be brought to an exact position in the XY plane of the machine.

The tension clamps on the clamping table can be adjusted manually or mechanically. In a preferred embodiment, at least the crossbeams of the clamping table are also moved via the machine support, which for this purpose has a driver device which can be brought into engagement with the crossbeams of the clamping table. It is particularly expedient to use the existing stop device, in particular its stop pin, as a driver device, which thus has a double function. The mechanical adjustment of the crossbeams of the clamping table makes it possible to further divide the separated plate section fixed on the clamping table by separating cuts in the Y direction and to move the plate parts thus formed apart in the X direction so that these smaller plate parts can also be machined all around. For example, the panel parts that have moved apart can also be milled along their narrow surface sides that run in the Y direction.

So that the cut plate or the individual plate parts can be transported out of the working area of the machine after processing, a lowerable suction clamping device is arranged on the machine support, via which the plate or the plate parts in the direction of the X-axis become one after being detached from the clamping table Can be transported at the end of the clamping table, where a transfer device is arranged, which removes the plates from the suction clamping device on the support and passes them on to a conveyor device.

Applications are conceivable in which the support device arranged in front of the clamping table is not required or even interferes. For this purpose it can be provided that the rolling elements or the sliding devices of the support device are arranged on supports which can be moved out of the area in front of the clamping table. One of the support guides required for the carrier can also be arranged on the bed of the machine tool, which results in a particularly precise arrangement of the support device.

Fig. 1

eine schematische Draufsicht auf eine Werkzeugmaschine in Gestalt eines Bearbeitungszentrums, dessen Arbeitsspindel mit einer Sägevorrichtung bestückt werden kann,

Fig. 2

eine der Fig. 1 weitgehend entsprechende Draufsicht auf die Werkzeugmaschine in anderer Position der vom Spanntisch aufgenommenen Werkstücke und

Fig. 3

eine schematische Seitansicht der Maschine nach den Fig. 1 und 2.

The invention is explained in more detail below with reference to the drawing using an exemplary embodiment. Show:

Fig. 1

1 shows a schematic top view of a machine tool in the form of a machining center, the work spindle of which can be equipped with a sawing device,

Fig. 2

one of Fig. 1 largely corresponding plan view of the machine tool in a different position of the workpieces picked up by the clamping table and

Fig. 3

2 shows a schematic side view of the machine according to FIGS. 1 and 2.

1 shows a machine bed 5 on which a clamping table 1 is located. However, the clamping table 1 does not have a continuous table surface for receiving the plate-shaped workpieces, but cross members 2 and suction clamps 3 arranged thereon, the upper sides of which lie in the table plane. Overall, the clamping table 1 has an elongated shape rectangular basic shape, the longitudinal direction of the clamping table 1 representing the usual X direction and its transverse direction the usual Y direction. Correspondingly, the processing units of the machine can be moved in an X-axis and a Y-axis in the so-called XY-plane, and if necessary additionally perpendicularly in a Z-axis.

The crossbeams 2 of the clamping table 1 run in the Y direction and are adjustable in the X direction, for which purpose they are supported on corresponding guides 4. The suction clamps 3 arranged on the crossbeams 2 of the clamping table 1 are displaceable in the Y direction and can be arranged in such a way that the plate-shaped workpieces fixed thereon can be machined all around without a collision with the suction clamps 3.

A support 6, which is a cross support, is arranged on the machine bed 5 such that it can be moved behind the clamping table. It therefore has a cantilever support 7 which is movable in the X direction on the machine bed 5 and also has a Y support 8 which can be moved on the cantilever support 7 in the Y direction. The Y support 8 of the support 6 carries a work spindle 9, which is illustrated in particular in FIG. 3. In the lower tool holder of the work spindle 9, 28 different machining tools can be exchanged from a tool magazine. This also includes a sawing device 10, which is located in the representations of the drawing in the tool holder of the work spindle 9. The sawing device 10 has a circular saw blade which is arranged in a plane vertical to the XY plane and can be pivoted in this plane. The circular saw blade of the sawing device 10 be aligned to the X direction, as illustrated in FIG. 1, or to the Y direction, as can be seen from FIG. 3. Accordingly, the work spindle 9 has a swivel drive and a rotary drive, the latter serving to drive the circular saw blade of the sawing device 10 in a rotating manner. In principle, the sawing device 10 can also be arranged directly on the support 6, in which case it is then provided with its own drive device for pivoting and rotating the saw blade.

As is further apparent from FIGS. 1 and 2, in the extension of the Y direction the clamping table 1 of the machine is preceded by a support device 11 which extends parallel to the X direction over the length of the clamping table 1 and any extension in the Y direction Can have dimensions. The support device 11 consists of a plurality of supports 12 aligned parallel to the Y direction, on each of which a plurality of rolling elements or sliding elements 13, such as nozzles which blow out supporting air, are mounted, which span a support plane which is essentially level with the top of the clamping table 1 is.

The support device 11 is used to receive a large-format plate 14, which has such an extent seen in the Y direction that it cannot be picked up by the clamping table 1 alone. Rather, in the working area of the machine, a section 16 is separated from this large-format plate 14, which immediately has the appropriate workpiece width, as is required, for example, for carcase sides of furniture, furniture doors, furniture flaps, drawer fronts or the like. For this purpose, the large-format plate 14 by means of a feed device 15 on the support device 11 in the Y direction until the clamping table 1 is pushed until a suitable cut can be made with the saw device 10 along a dividing line 19 running in the X direction. The separated plate section 16 remains on the clamping table 1, while the remaining plate 17 remaining from the large-format plate 14 is pulled back away from the clamping table 1 and remains on the support device 11 until another plate section 16 to be separated is transferred to the clamping table 1 during the next work cycle ,

The adjustability of the crossbeams with the suction clamps arranged thereon makes it possible to position suction clamps 3 on the plate 14 pushed onto the clamping table 1 on both sides of the cutting line 19, which during the separating cut by the sawing device 10 in the X direction the plate section 16 to be separated as well as the Fix the remaining plate 17. For the further processing operation, the suction clamps 3 which fix the separated plate section 16 can remain in action, so that the suction clamps 3 on the front of the clamping table 1 are used primarily for the next subsequent cut to fix the remaining plate 17.

If necessary, the separated plate section 16 can be divided further by making cross sections in the Y direction after the plane of the saw blade of the sawing device 10 has been pivoted accordingly. As can be seen from this in FIG. 2, individual plate parts 18 are formed, which can be moved apart in the X direction by moving the corresponding crossbeams 2 it can also be worked along the narrow surface sides running in the Y direction.

So that an exact alignment is achieved when the large-format plate 14 is fed onto the clamping table 1, a stop device 21 is provided on the Y support, which, as FIG. 3 makes clear, has stop pins 20 which can be extended in the Z direction and which extend to the clamping level of the Clamping table 1 can be lowered. Thus, the stop for the plate 14 is predetermined by the Y position of the Y support 8, which can be selected in such a way that the dividing line 19 for the plate section 16 to be divided is in each case at the same Y coordinate. In the X-direction, the large-format plate 14 is aligned on the clamping table 1 by an X-stop 27, which in its rest position is located below the crossbeams 2 and can be moved upwards beyond the support plane of the clamping table 1. In its rest position, the X-stop 27 is lowered to such an extent that the adjacent cross-member 2 can be moved over it without collisions, a collision with the processing tools is also ruled out and the removal of the processed plate section 16 is not impaired.

The stop bolts 20 and the entire stop device 21 have a double function in that they can also be brought into engagement or in contact with the crossbeams 2 of the clamping table 1 in order to move them in the X direction by being carried by the support 6. Thus, in particular after further dividing the separated plate section 16, the individual plate parts 18 formed, as shown in FIG Fig. 2 are shown, move into the position shown there, apart.

So that the machined plate section 16 or the machined plate parts 18 can be transported away, a lowerable suction clamping device 22 is arranged on the support 6, via which the plate section 16 or the plate parts 18 is raised and released in the X direction when the X- Stop 27 can be transported to an end take-over device 23. The take-over device 23 consists of two rollers arranged one above the other in the manner of a mangle, between which the plate section 16 or the plate parts 18 are inserted so that they can be transferred to a further transport device 24.

As FIGS. 1 and 2 make further clear, the support device 11 upstream of the clamping table 1 can be moved laterally, so that the space occupied by the support device 11 and which is not required if necessary is available for other purposes. For this purpose, the supports 12 of the support device 11 which extend in a straight line parallel to the Y direction are arranged on guides 25 which run parallel to the X direction of the machine. The supports 12 can be displaced in their transverse direction on these guides 25 and their spacing from one another can be reduced, as a result of which the entire support device 11 can be moved aside to save space. Unlike shown in the drawing, the guide 25 adjacent to the clamping table 1 can be arranged in a particularly advantageous manner on the bed 5 of the machine. An exact arrangement of the support device is thus achieved 11 to the machine, although this limits the lateral mobility of the support device 11 or its support 12 to the length of the machine bed 5.

The large-format plates 14 to be divided can - depending on how they are transported to the support device 11 - have an upright position. In order to be able to move it from this upright position into the horizontal support plane of the support device 11, a plate swiveling device 26 is provided on the side of the support device 11. Essentially, this plate swiveling device 26 consists of a frame or a plate 29 with a flat contact side, on which there is an angled position 30 in the upright position, onto which the respective large-format plate 14 with its narrow side surface to be accommodated can be placed. From the upright position, the plate swiveling device 26 can be swiveled by an angle of approximately 90 ° in such a way that the large-format plate 14 which has been picked up can be transferred into the horizontal support plane of the support device 11. Seen in the extension of the Y direction of the machine tool, the plate swiveling device 26 is arranged either on the right or left of the support device 11, expediently it is seated on the respective external support 12 of the support device 11, in FIG. 3 only this external support 12 of the support device 11 is shown.

Claims (14)

1. Machine tool for the stock-removal all-round machining of panels (14) of wood or wood substitute materials, such as panels for furniture or internal structures, with an elongated rectangular clamping table (1) and at least one radial arm support (7) which is movable behind same in the longitudinal direction thereof, the x-axis, with a support (8) movable above the clamping table (1) in the transverse direction thereof, the y-axis, and intended to hold the machining assemblies or tools, as well as a sawing device (10) with a circular saw blade which can be set up at least on a cutting line (19) which runs in the direction of the x-axis,
   characterised in that
   in the extension of the y-axis in front of the clamping table (1) there is a supporting device (11) provided on the same level and which is the same length or shorter parallel to the x-axis but wider than the clamping table (1) in the direction of the y-axis and on which a large-format panel (14) is to be mounted whose extension in the direction of the y-axis is greater than that of the clamping table (1) and which for separating off a section (16) along a cutting line (19) running in the direction of the x-axis can be moved over to the clamping table (1) and after the separating cut can be returned as a residual panel to the supporting device (11), that the supporting device (11) is equipped with rolling bodies or sliding devices (13) on the top side and that on the side remote from the supporting device (11) above the clamping table (1) there is a stop device (21) which can be adjusted in the direction of the y-axis for the panel (14) which is transferred to the clamping table (1), whereby this stop device (21) is mounted vertically adjustable on the support (8) movable in the direction of the y-axis.
2. Machine tool according to claim 1,
   characterised in that
   the clamping table (1) has cross beams (2) adjustable in the direction of the x-axis and suction tensioners (3) displaceable thereon in the direction of the y-axis, which can be positioned either side of the cutting line (19) both underneath the panel section (16) which is to be cut off and also underneath the adjoining section of the residual panel (14).
3. Machine tool according to claims 1 or 2,
   characterised in that
   the stop device (21) on the y-support (8) consists of two vertically movable stop bolts (20).
4. Machine tool according to one of claims 2 or 3,
   characterised in that
   a follower device for adjusting the cross beams (8) of the clamping table (1) is mounted on the support (6).
5. Machine tool according to claim 4,
   characterised in that
   the stop device (21) at the same time forms the follower device and correspondingly the vertically movable stop bolts (20) are followers which can be brought into engagement with the cross beams (2) of the clamping table (1).
6. Machine tool according to one of claims 1 to 5,
   characterised in that
   an x-stop (27) which can be lowered from the support bearing plane is mounted on the clamping table (1).
7. Machine tool according to one of claims 1 to 6,
   characterised in that
   the support (6) is movable in the x-axis and thereon is mounted a suction tensioning device (22) which can be lowered onto the one machined panel or the panel parts (18) which are located on the clamping table (1), and on at least a cross end of the clamping table (1) there is a transfer device (23) for the machined panel or the machined panel parts (18) which are taken up by the suction tensioning device (22).
8. Machine tool according to one of claims 1 to 7,
   characterised in that
   a feed unit which moves the large-format panel (14) is mounted on the supporting device (11).
9. Machine tool according to one of claims 1 to 8,
   characterised in that
   the rolling bodies (13) or slide devices of the supporting device (11) are mounted on supports (12) and are movable out from the region in front of the clamping table (1).
10. Machine tool according to claim 9,
    characterised in that
    the supports (12) of the supporting device (11) are arranged parallel to the y-direction and are movable parallel to the x-direction.
11. Machine tool according to claim 10,
    characterised in that
    the support (12) is mounted on guides (25) which extend in the x-direction and of which the guide adjacent the clamping table (1) is located on the machine bed (5).
12. Machine tool according to one of claims 1 to 11,
    characterised in that
    on the supporting device (11) on at least one side is a plate swivel device (26) for moving the large format panel (14) from an upright position over into the support bearing plane of the supporting device (11).
13. Machine tool according to claim 12,
    characterised in that
    the plate swivel device (26) is mounted on the outside on at least one of the two outer supports (12) of the supporting device (11) parallel to the x-direction.
14. Machine tool according to one of claims 1 to 13,
    characterised in that
    on the support (6) is a work spindle (9) which has a tool socket equipped with a rotary and swivel drive and in which the sawing device (10) can be housed.