EP0159526B1 - Apparatus for cutting flat materials - Google Patents

Description

The invention relates to a cutting machine for flat material, which has a support for the flat material and a carriage which can be moved along the support by means of at least one running rail and which carries a column to which a boom which extends over the support is attached so as to be pivotable about a first axis. wherein the boom has at least two arms which are pivotally connected to each other via a joint with a second axis parallel to the first axis and whose outer carries a cutting device which is pivotable relative to the outer boom arm about a third axis parallel to the first axis and in operation with a Foot rests on the support, with all three axes then running approximately vertically.

In a known cutting machine of this type (FR-A-2 345 054, FIGS. 1 and 2), the carriage is guided on two rails arranged one above the other and extending along the support, and is firmly connected to the upwardly projecting column. The first pivot axis for the boom is attached to this. Carriage, column and boom are extremely stable because they are designed to hold the cutting device designed as a butt knife machine over the table-shaped support in such a way that the foot of the butt knife machine just touches the support. This goal is also served by a spring suspension of the butt knife machine on the trailer in a height-adjustable bearing. Since this known cutting machine as a result of the requirement to relieve the foot of the cutting device from the weight of the pusher and the boom, and yet to allow the foot to slide on the support, the guides for the carriage, the column and the boom arms are of extremely stable construction must, it is also relatively expensive.

Nothing else applies to another known cutting machine with a cutting device designed as a butt knife machine (EP-A-0 057 782), in which a carriage bridging the table-shaped support runs on rails mounted on both longitudinal sides of the support and carries an upright column in the middle, on which a two-armed articulated arm carrying the cutting device is articulated, because this known cutting machine differs from the known construction described only in that the carriage is not arranged and guided on the side of the support, but bridges the support, and consequently the column is above the center line of the support instead of on one of its long sides.

A third known cutting machine for flat material (EP-A-0 089 006) differs from the known construction described in the second place according to EP-A-0 057 782 in that a carriage which can be moved transversely to the longitudinal direction of the support is guided on the carriage bridging the support is, which in turn carries a vertical joint for a cantilever, on which a cutting device, again in the form of a butt knife machine, is attached so as to be rotatable about a vertical axis. The boom essentially consists of two handlebars, which are connected to each other by means of tabs provided on the handlebar ends and four horizontally extending joints to form a parallelogram and ensure that the cutter can be raised and lowered vertically, but is always held perpendicular to the support. In order to relieve the weight of the foot of the butt knife machine sliding on the support, the end of the upper arm of the arm on the carriage side is connected to the end of the lower arm on the cutter side by means of a tension spring. It is obvious that this construction is also relatively complex.

The invention. the task was now to improve the known cutting machine described at the outset according to FR-A-2 345 054 so that it can be produced more cost-effectively.

In solving the task, the inventor assumed that the first thing that matters with such a cutting machine is to keep the cutting element - in the case of a butt knife machine, the vertically oscillating butt knife - always perpendicular to the support for the flat material to be cut Avoid oblique cuts and thus different sized cut parts when processing a flat material layer stack. On the other hand, for the usability of such a cutting machine, it is not absolutely necessary to make the force with which the cutting device rests on the support as small as possible or zero.

According to this consideration, it is proposed to solve the problem, to design a cutting machine of the type mentioned in such a way that the column can be tilted about a tilt axis parallel to the support. With such a cutting machine, it is then only necessary to provide sufficiently stable swivel joints on and between the cantilever arms, which prevent the cutting device from tilting back and forth around its foot, while the cantilever arms themselves and the column can be produced from light, cheap light metal profiles or the like, since these are only intended to prevent the cutter from tipping over the support, a danger which is particularly great when the cutter is only held and guided by hand when the cutter rests on the support only with a relatively small foot. When he ^f indungsgemä- SEN cutting machine is thus ensured that, even when not absolutely more rigid construction between the guide for the carriage, and the pivot bearing latter always rests for the cutting apparatus with his foot on the support, as the cantilever holding column about an Support parallel tilt axis is tiltable, so that, unlike the known cutting machine described at the outset, it is not important that all parts of the cutting machine responsible for guiding and holding the cutting device are produced with exact dimensions and are connected to one another without play and are themselves rigid. to avoid that the foot of the cutting device either does not lie on the support at all or is pressed against it with great force.

In addition, it should also be pointed out that "vertically in the sense of the above explanations in a butt knife machine merely means that the plane defined by the butt knife and the direction of advance of the cutting device is perpendicular to the plane defined by the surface of the support, although of course such embodiments are preferred in which the front cutting edge of the butt knife always runs at least approximately perpendicular to the support.

So that the column can tilt, for. B. two carriages guiding the carriage may be mounted on a support which is pivotable about the tilt axis relative to the support; However, embodiments are preferred in which the column forms a rigid unit with the carriage and the carriage is held on the running rail so as to be tiltable about the tilt axis. Alternatively, the cutting machine can be designed such that the column and the carriage are connected to one another via a joint that defines the tilt axis. are connected, so that the carriage immobile - apart from the movement in the direction of travel - can be guided on the track. This also applies to a further embodiment in which the column has two parts which are connected to one another via a joint defining the tilt axis. If it is also desirable to relieve the weight of the cutting device foot, a counterweight designed in the manner of a cantilever, the tilting moment of which can preferably be adjusted, can be attached to the tiltable area of the column, opposite the cantilever.

• Figur 1 eine Stirnansicht einer ersten Ausführungsform der erfindungsgemässen Zuschneidemaschine, in Verschieberichtung des Wagens gesehen ;
• Figur 2 die Wagenführung der Zuschneidemaschine nach Figur 1 in grösserem Maßstab ;
• Figur 3 eine alternative Wagenführung in einer Darstettung_'entsprechend der Darstellung in Figur 2, und
• Figur 4 eine der Figur 1 entsprechende Darstellung einer dritten Ausführungsform der erfindungsgemässen Zuschneidemaschine.

Further features, advantages and details of the invention emerge from the attached description and the following graphic representation of some preferred embodiments of the invention; show in the drawing:

• Figure 1 is an end view of a first embodiment of the cutting machine according to the invention, seen in the direction of displacement of the carriage;
• Figure 2 shows the carriage of the cutting machine of Figure 1 on a larger scale;
• Figure 3 shows an alternative carriage management in a presentation _' as shown in Figure 2, and
• Figure 4 is a representation corresponding to Figure 1 of a third embodiment of the cutting machine according to the invention.

FIG. 1 shows a table top serving as a support 10, which is supported by a frame 12 which is only partially shown. On this frame and advantageously only slightly below the support 10, a running rail 14 formed by a square profile tube is fixedly attached, which extends in the longitudinal direction of the support 10 and on which a carriage 16 of a cutting machine is displaceably guided. It has two support rollers 20, which are provided one behind the other with wheel flanges 18, as shown in FIG. 1, of which FIG. 1 shows only the support roller facing the viewer and which roll on the top of the running rail 14, and at least one supporting roller 22 which is on the underside of the running rail 14 rolls off.

A column 24 is fixedly attached to the carriage 16, on which a boom designated as a whole by 26 is rotatably mounted by means of a first pivot bearing 28; the latter defines a first pivot axis 30 which, when the cutting machine is in operation, runs at least approximately perpendicular to the surface formed by the support 10. The extension arm 26 extends over the support 10 and comprises an inner and an outer extension arm 32 and 34 as well as a second pivot bearing 36 with a pivot axis 40 running perpendicular to the support 10, via which the two extension arms are articulated to one another. At its outer end, the cantilever arm 34 is provided with a third pivot bearing 44, the pivot axis of which also extends perpendicularly to the support 10 and in which a conventional electric ram knife machine 48, as described in DE-A-27 03 066, is suspended and rotatably supported is. It has a guide handle 50, a support 54 designed as a guide for the thrust knife 52 which oscillates in the vertical direction, and a footplate 56 fastened to the lower end of the latter, with which the cutting machine is supported on the support 10.

It is particularly advantageous if a rigid arm 60 is attached to the column 24, wherein “rigid” is only intended to mean that the arm 60 should not be pivotable about a vertical axis. It also extends over the support 10 and, in the preferred embodiment, can be adapted to the width of the support 10 due to its telescopic design. With the aid of the extension arm 60, the carriage 16 can be operated by an operator who is on the right-hand side of FIG Edition 10 stands, drive back and forth along the edition.

In the embodiment according to FIG. 1, the carriage 16, the column 24 and the arm 26 can be tilted to a limited extent around the running rail 14, as will now be explained with reference to FIG. 2.

The idlers 20 have a ball-shaped tread 20a on one side, which forms two circular arcs in axial section, the center of curvature of which has been designated 20b and the radius of which has been designated R. The support roller 22 is laterally offset from the center of curvature 20b, which enables the carriage 16 and the column 24 to be used despite the use of a rectangle gen square profile from the position shown in Figure 1 to tilt the running rail 14 counterclockwise by a limited angle (see. The tilted position shown in phantom in Figure 2).

As already mentioned, the only important thing is that in the position shown in FIG. 1, the butt knife machine 48 cannot tip forward or backward about the base plate 56.

Since the push knife machine 48 is to be removably attached to the boom 26, a preferably adjustable stop 64 is also attached to the column 24, which in particular can have the form of a screw with a lock nut and, after dismantling the push knife machine, is intended to prevent the boom 26 from moving in the direction tilts down to edition 10. In the normal operating state, however, the stop 64 should have a small distance from the support 10 or the frame 12. Another advantage of the stop 64 is that the boom 26 and the thrust knife machine 48 do not tip far down when the thrust knife machine once extends beyond the support 10.

The embodiment according to FIG. 3 differs only in the type of guidance of a carriage 16 'from the embodiment according to FIGS. 1 and 2. In the cutting machine according to FIG. 3, at the level of the support 10 there is a running rail 14' with a circular cross section on a frame 12 'for a support 10', and the carriage has two support rollers 20 'with a circular arc-shaped running surface 20a', the curvature of which is adapted to the outer radius of the running rail 14 '. The carriage 16 'has at least one support roller 22' centrally below the support rollers 20 ', so that the carriage can tilt about the longitudinal central axis of the running rail 14'. It is particularly advantageous in this embodiment that the tilt axis 66 'is only very slightly below the surface of the support 10'.

In the embodiment according to FIG. 4, an upper and a lower running rail 104 or 106 for a carriage 108 are mounted on a frame 102 carrying a support 100, which carriage has two carrying rollers 110 for the running rail 104 and two supporting rollers 112 for the running rail 106. A rack 116 is fastened to the frame 102 below the running rail 104 and engages in a pinion 120 which can be driven by an electric geared motor 118. The geared motor 118 can be switched on and off via an electrical switch 122 and switched in its direction of rotation, this switch being fitted above the push knife machine 48.

In the embodiment according to FIG. 4, a column 130 is articulated on the carriage 108 via a tilting bearing 132 with a horizontal tilting axis 134 running perpendicular to the plane of the drawing in FIG. This column carries, via a first swivel bearing 28 mounted on it, the arm 26, which can otherwise be of the same design as in the embodiment according to FIG. 1, so that the same reference numerals as in FIG. 1 have been used for its parts and a detailed description is dispensed with can. Finally, FIG. 4 shows a possibility for relieving the weight of the support 54: on the side of the column 130 opposite the arm 26, a support arm 200 is fastened to the column, along which a counterweight 202 can be displaced. A locking screw 204 serves to fix the counterweight 202 in a position in which the base plate 56 only rests on the support 100 with a small force. Depending on the size of the counterweight 202, the support arm 200 can be kept relatively short.

It should also be noted that the first pivot bearing, for. B. the pivot bearing 28 in the embodiment of Figure 1, could also be provided between the carriage and the column, although such an embodiment is not preferred because it would then no longer be possible to use the rigid boom 60 to move the carriage along the Postpone edition.

In the embodiment according to FIG. 4, the tilting bearing 132 could also be somewhat higher or the column 130 could extend down to below the support 100, so that the column would consist of two parts pivotally connected to one another via the tilting bearing.

All embodiments are particularly advantageous in which the approximately horizontally extending tilt axis about which the boom carrying the cutting device can be pivoted is approximately at the level of the support for the flat material or slightly above or below it. Manufacturing tolerances with regard to the height of the tilt axis then play the least role. Are an upper and a lower guide for the car, z. If, for example, the elements 20 and 22 in the embodiment according to FIGS. 1 and 2 or the elements 104 and 106 or 110 and 112 in the embodiment according to FIG. 4 are provided, it is advisable to set the tilt axis approximately at the level of the upper one To arrange carriage guidance. In addition, it is advantageous to provide the upper carriage guide approximately at the level of the support for the flat material. If the tipping axis is approximately at the level of the support for the flat material, it is not important that the carriage carrying the boom is guided exactly.

If the carriage carrying the boom can be tilted together with the boom, the carriage can be made much simpler and lighter, and it no longer has to be held on its guides as stably and precisely as is the case with the known cutting machines of the type in question here is.

Claims (8)

1. Cutting-out machine for flat material, with a support for the flat material, a carriage guided to slide along the support by means of at least one guide rail, which carriage supports a column, on which a bracket extending above the support is arranged to tilt about a first axis, the bracket comprising at least two arms, which are rotatably connected to each other by way of a joint with a second axis parallel to the first axis and whereof the outer arm supports a cutting device, which with respect to the outer bracket arm is able to tilt about a third axis parallel to the first axis and during operation rests with a foot on the support, whereby all three axes then extend approximately vertically, characterised in that the column (24 ;130) is able to tilt about a tilting axis (14 ; 66' ; 134) parallel to the support (10 ; 10' ; 100).

2. Cutting-out machine according to Claim 1, characterised in that the tilting axis (14 ; 66' ; 134) is parallel to the direction of travel of the carriage (16 ; 16' ; 108).

3. Cutting-out machine according to Claim 2, characterised in that the column (24) forms a rigid unit with the carriage (16 ; 16') and the carriage is held on the guide rail (14 ; 14') so that it is able to tilt about the tilting axis.

4. Cutting-out machine according to Claim 1 or 2, characterised in that the column (130) and the carriage (108) are connected to each other by way of a joint (132) defining the tilting axis (134).

5. Cutting-out machine according to Claim 1 or 2, characterised in that the column (130) comprises two parts connected to each other by way of a joint (132) defining the tilting axis (134).

6. Cutting-out machine according to one or more of Claims 1 to 5, characterised in that the tilting axis (14 ; 66' ; 134) is located approximately at the level of the support surface.

7. Cutting-out machine according to one or more of Claims 1 to 6, characterised in that located on the tiltable region of the column (130), opposite the bracket (26) is a counterweight (200, 202) constructed in the form of a bracket.

8. Cutting-out machine according to Claim 7, characterised in that the tilting moment of the . counterweight is adjustable.

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