CUTTING DEVICE, EDGE PROCESSING DEVICE AND METHOD FOR CUTTING A COATING MATERIAL

Description

[0001] The invention relates to a separating device according to the preamble of claim 1, as known, for example, from DE 929 091 C.

[0002] When joining coating material to the narrow side of panel-shaped workpieces, a strip of coating material pulled from a roll is usually separated from the rest of the roll using a generic cutting device. The coating material can be plastic or real wood, for example. One challenge when cutting through the coating material is that it has to be cut while it is being fed to a workpiece, i.e. while it is moving. For this reason, such a cutting device is often pivoted or displaced. When the cutting edge of the cutting knife of the cutting device hits the coating material, the cutting device or its cutting knife unit is pulled along with the moving coating material and pivots or moves in the process.

[0003] The current problem here is that coating material chips can form during cutting; these are smaller or larger pieces of the coating material that have been severed from the coating material during the cutting process. The jerky cutting movement causes the chips to be thrown uncontrollably into the surrounding area. Such chips are undesirable because they can lead to a variety of malfunctions, such as disrupting the further advance of the coating material, blocking mechanics, falsely triggering sensors, etc. A main cause of the formation of such chips is the undefined path of the coating material in the area between the cutting edge of the cutting knife and a corresponding counter bearing, in particular the counter knife. Due to the varying thicknesses and materials of the coating material, its position in the cutting direction of the cutting knife within the specified area is not clearly defined.This creates a "double cut," as the tip of the blade first hits the coating material (first cut) and then pushes it against the counterbearing, cutting it through (second cut). This double cut then creates a (often wedge-shaped) snippet.

[0004] WO 86 / 07300 A1 discloses a method for cutting a stack of blanks, in particular veneers, using a double-bladed knife with two blades. The stack of blanks is placed on a base. A pressure bar is then placed on the stack, and pressure is applied so that the stack is pressed against the base. A cut is then made with the double-bladed knife, with the two blades of the double-bladed knife cutting into the stack on either side of the pressure bar. The pressure bar is thus dimensioned so that it can be spatially arranged between the two blades. However, this arrangement is not suitable for cutting during the feeding of coating material.

[0005] The object of the present invention is therefore to improve the separating device mentioned at the outset in such a way that the problem described above is avoided.

[0006] This object is achieved by a cutting device having the features of claim 1, an edge processing device having the features of claim 7 and a method for cutting through a coating material having the features of claim 14. Advantageous embodiments can be found in the respective dependent claims.

[0007] The cutting device according to the invention is for use in cutting through coating materials, in particular edge bands, and comprises a cutting blade with a cutting edge and a drive coupled to the cutting blade. The drive is designed such that it can move the cutting blade, in particular in a feed direction, from a standby position to a cutting position. In the standby position, the cutting blade has no contact with the coating material; in the cutting position, the cutting edge of the cutting blade comes into contact with the coating material. The cutting device further comprises a counter-bearing or counter-blade, which serves to assist a coating material during cutting thereof. During the cutting process, the cutting edge is moved towards the counter-bearing so that the coating material lies between the counter-bearing and the cutting edge.

[0008] According to the invention, a clamping element is arranged on the cutting knife. This clamping element preferably projects beyond the cutting edge of the cutting knife in the direction of the counter bearing in the unloaded state, that is to say in which no external forces act on the clamping element or the clamping element has no contact with the coating material to be cut, or is located in this direction at the same height as the free end of the cutting edge of the cutting knife, i.e. is arranged flush with it. As a result, when the cutting knife moves from the standby position to the cutting position, the clamping element also initially comes into contact with the coating material and clamps it between itself and the counter bearing. The clamping element is further designed such that in the cutting position it deforms elastically and / or shifts relative to the cutting knife to such an extent that it springs back behind the cutting edge of the cutting knife relative to the cutting knife.This ensures that the clamping action described above is maintained until the cutting edge of the cutting knife actually touches the coating material. This prevents the coating material from being cut twice, as occurs with state-of-the-art cutting devices, thus preventing the formation of shreds.

[0009] The clamping element according to the invention can be designed in different ways. A preferred embodiment provides that the clamping element is a component made of an elastic material, in particular a plastic or a rubber material or an elastomer material. This material is particularly gentle because it basically does not damage the coating material upon contact with it. When the clamping element comes into contact with the coating material and the coating material is clamped between itself and the counterbearing, part of the clamping force is used to elastically deform the clamping element. This deformation causes the clamping element, which originally protruded beyond the cutting edge of the cutting blade, to be pushed back and ultimately the cutting edge of the cutting blade comes into contact with the coating material when the cutting position is reached.In this way, the coating material is clamped until the cutting edge can actually cut through the coating material. Relative movement between the cutting edge and the coating material in the feed direction no longer occurs during the cutting process.

[0010] In an alternative embodiment, it can be provided that the clamping element itself is made of a resilient material, in particular spring steel. For example, the clamping element can then be designed in the form of a leaf spring which runs onto the coating material during the cutting process and builds up a spring force. Alternatively or additionally, the clamping element can also be designed as an element that is displaceable on the cutting knife. Preferably, a spring is provided which can preload the clamping element in the direction of the counterbearing. In a preferred embodiment, this spring is preloaded the moment the clamping effect begins. When the cutting knife is retracted into the ready position, the preload ensures that the clamping element is pushed back into the position protruding from the cutting edge of the cutting knife.

[0011] Theoretically, the movement of the clamping element can also be achieved via the drive of the cutting device or a separate drive relative to the cutting blade. The clamping element is then driven to move, particularly displace, the cutting blade relative to the cutting blade via the drive.

[0012] The cutting blade itself can be actuated in various ways. A preferred embodiment provides for the drive to be coupled to the cutting blade via an eccentric, and optionally also via a connecting rod. The eccentric can thus interact directly with the cutting blade and move it, or it can be coupled to the cutting blade via a connecting rod. The drive can also be a pneumatic drive. In principle, the drive can be any linear drive. Linear means that the cutting blade, moved by the drive, can perform a linear movement.

[0013] The cutting device according to the invention is preferably part of an edge processing device for coating the narrow sides of panel-shaped workpieces made of wood or wood substitutes with coating materials, in particular edge bands. The edge processing device generally has a feed device that feeds a coating material to a workpiece. The cutting device described above is arranged in the area of ​​the feed device. The cutting device can be mounted in a rotational and / or translational manner so that it can be moved along with the coating material.

[0014] If the moving coating material is clamped using the clamping element and the corresponding counter bearing, the cutting device moves with the coating material. This allows for a clean cut.

[0015] The invention also relates to a method for cutting a coating material, in particular an edge band, which is fed to a workpiece in the edge processing device described above. In the method according to the invention, the cutting blade for cutting the coating material is moved from a standby position, in which the supplied coating material is guided through a gap between the counter bearing and the cutting edge of the cutting blade, into a cutting position. This can be done, in particular, by advancing the cutting blade in a feed direction.

[0016] When moving into the cutting position, the coating material is initially pushed into the clamping position by the clamping element against the counter-bearing and clamped between the clamping element and the counter-bearing. The clamped coating material is then severed by the cutting edge as the cutting blade continues to move toward the counter-bearing, with simultaneous elastic deformation or displacement of the clamping element. As already mentioned above, the cutting device can be arranged to move with the edge band, in particular to be linearly displaced or pivoted.

[0017] The invention is described below with reference to the Figures 1 to 6 illustrated embodiment is explained in more detail. Figure 1 shows a perspective view of a separating device according to the invention. Figure 2 shows another perspective view of the Fig. 1 shown separating device. Figure 3shows a top view of the Fig. 1 and 2 The cutting device shown, with the cutting blade in the ready position. Figure 4 shows a detailed view of the Fig. 3 shown top view shortly before reaching the separation position. Figure 5 shows a detailed view of the Fig. 3 shown top view when reaching the separation position. Figure 6 shows an alternative detailed view of the Fig. 5 shown top view when reaching the separation position.

[0018] The Fig. 1 to 3The separating device 1 shown has a drive 2 which is coupled to the separating knife 10. As shown here, this coupling can preferably be effected via a connecting rod 14 which couples the separating knife 10, which is guided in a knife guide 13, to an eccentric 16 arranged on the axis of the rotating drive shaft of the drive 2. The connecting rod 14 is articulated with the eccentric 16 at the joint axis A and with the separating knife 10 at the joint axis B. Thus, via this connecting rod drive, when the drive rotates, the separating knife 10 can be moved from the Fig. 1 to 3shown standby position, in which the coating material K, e.g. an edge band, is guided with play in the gap 15 between the cutting knife 10 and a counter knife or counter bearing 11, in or against the feed direction X. Z denotes the vertical direction perpendicular to the feed direction. X, Y denotes a transverse direction, which can be, for example, the conveying or feeding direction of the coating material K. The conveying of the coating material K takes place by means of a feeding device (not shown here), in the area of ​​which the cutting device 1 is arranged within an edge processing device.

[0019] On the cutting knife there is a 10a ( Fig. 3) according to the invention, a clamping element 12 is arranged or attached. The clamping element 12 is either designed to be elastically deformable or is mounted so as to be movable relative to the cutting knife 10. If the clamping element 12 itself is driven, either by the drive 2 or its own drive, it is also conceivable for the clamping element 12 to be attached not to the cutting knife 10 but to another component, for example to the knife guide 13. The entire cutting device 1 can be pivoted about the pivot axis S so that it can be moved along with the movement of the coating material. This does not necessarily have to be a pivoting movement; it is also conceivable for the cutting device 1 to move linearly and synchronously with the coating material K, for example in the Y direction.

[0020] In the standby position, which is in the Fig. 3As shown, the coating material K passes through the gap 15 between the cutting blade 10 or the cutting edge 10a and the counter bearing 11 with play. The leading edge 12a of the clamping element 12 in the feed direction X - i.e. the section of the clamping element 12 facing the counter bearing 11 - projects beyond the cutting edge 10a in the feed direction or is at least flush with the cutting edge 10a. As mentioned above, this does not necessarily have to be the case. In the case of a clamping element 12 that is itself movable relative to the cutting blade 10, it can, for example, only be advanced into the position protruding beyond the cutting blade 10 or the flush position shortly before the cut.At the start of the cutting process, the cutting knife 10 is advanced in the feed direction X towards the coating material K, the front edge 12a leading the cutting edge 10a initially comes into contact with the coating material K and pushes the coating material K against the counter bearing 11. This creates a clamping effect between the clamping element 12, the coating material K and the counter bearing 11. This situation is shown in . Fig. 4 The cutting blade 10 can be linear and / or pivoting around the pivot axis S (cf. Fig. 3 ) are moved along with the coating material K.

[0021] As the cutting knife 10 is advanced further in the feed direction X towards the counter bearing 11, the front edge 12a and thus the clamping element 12 are displaced in the direction of arrow P due to the increasing clamping force, either by displacement ( Fig. 5) of the clamping element 12, if this is mounted in any way displaceably, or by elastic deformation, if the clamping element 12 is, for example, a rubber material, a plastic material or an elastomer material; this situation is in Fig. 6 indicated by the curvature W. If the cutting knife 10 is advanced further, it finally reaches the cutting position indicated by the dashed line 10a'. The clamping element 12 then springs back behind the cutting edge 10a of the cutting knife 10, so that the cutting edge is released and can cut through the coating material K. Once the coating material has been separated, the cutting knife 10 returns to the ready position. List of reference symbols:

[0022] 1Cutting device 2Drive 10Cutting knife 10aCutting edge of 10 11Counter bearing 12Clamping element 12Front edge of 12 13Knife guide 14Connecting rod 15Gap 16Eccentric KCoating material S -Pivoting axis of 1 A -Joint axis from 14 to 16 B -Joint axis from 14 to 13 E -Rotation axis of 16 W -Curvature of 12

Claims

1. Separating device (1) for separating veneering materials (K), comprising a separating knife (10) with a blade (10a) as well a drive (2) which is coupled to the separating knife (10) and which is configured so that it can move the separating knife (10) from a standby position into a separating position, wherein the separating device (1) further has a counter bearing (11) which serves to support a veneering material (K) during the separation thereof characterised in that a clamping element (12) is arranged on the separating knife (10) and is configured so that i) it can be elastically deformed in the separating position and / or ii) it can be displaced relative to the separating knife (10) as an element which is displaceable on the separating knife, and is preferably pretensioned by a spring towards the counter bearing (11), so that the clamping element (12) springs back in relation to the separating knife (10) behind the blade (10a) of the separating knife (10).

2. Separating device (1) according to Claim 1 characterised on that the clamping element (12) is a component part made of an elastic material, in particular a plastic or a rubber material or an elastomer material.

3. Separating device (1) according to Claim 1 characterised in that the clamping element (12) itself is made from a resilient material, in particular spring steel.

4. Separating device (1) according to one of the preceding claims characterised in that the clamping element (12) is driven in movable manner, in particular sliding manner, relative to the separating knife via the, or a, separate drive.

5. Separating device (1) according to one of the preceding claims characterised in that the drive (2) is a linearly acting drive and / or a pneumatic drive or is coupled to the separating knife (10) via an eccentric, in particular via a connecting rod (14).

6. Separating device (1) according to one of the preceding claims characterised in that the clamping element (12) in the unloaded state is arranged flush with or projects over the blade (10a) of the separating knife (10) in the direction of the counter bearing (11).

7. Edge processing device for covering the narrow sides of plate-type workpieces of wood or wood substitutes with veneering materials (K) wherein the edge processing device comprises a supply unit which guides a veneering material (K) up to a workpiece, wherein a separating device (1) for separating veneering materials (K) is arranged in the region of the supply unit and has a separating knife (10) with a blade (10a) as well as a drive (2) which is coupled to the separating knife (10) and is configured so that it can move the separating knife (10) from a standby position into a separating position, wherein the separating device (1) further has a counter bearing (11) which serves to support a veneering material (K) during separation thereof, characterised in that a clamping element (12) is arranged on the separating knife (10) and is configured so that in the separating position it can be elastically deformed and / or displaced relative to the separating knife (10) so that it springs back in relation to the separating knife (10) behind the blade (10a) of the separating knife (10).

8. Edge processing device according to Claim 7 characterised in that the separating device (1) is mounted for rotational and translational movement so that it can be moved along with the veneering material (K).

9. Edge processing device according to Claim 7 or 8 characterised in that the clamping element (12) is a component part made of an elastic material, in particular a plastic, or a rubber material or an elastomer material.

10. Edge processing device according to Claim 7 or 8 characterised in that the clamping element (12) itself is made from a resilient material, in particular spring steel and / or as an element which is displaceable on the separating knife and is preferably pretensioned by a spring towards the counter bearing (11).

11. Edge processing device according to one of Claims 7 to 10 characterised in that the clamping element (12) is driven in movable manner, in particular sliding manner, relative to the separating knife via the, or a, separate drive.

12. Edge processing device according to one of Claims 7 to 11 characterised in that the drive (2) is a linearly acting drive and / or a pneumatic drive or is coupled to the separating knife (10) via an eccentric, in particular via a connecting rod (14).

13. Edge processing device according to one of Claims 7 to 12 characterised in that the clamping element (12) in the unloaded state is arranged flush with or projects beyond the blade (10) of the separating knife (10) in the direction of the counter bearing (11).

14. Method for separating a veneering material (K) which is supplied to a workpiece in an edge processing device according to one of Claims 7 to 13 in which the separating knife (10) for separating the veneering material (K) is moved from a standby position, in which the supplied veneering material (K) is passed through in a gap (15) between the counter bearing (11) and the blade (12) of the separating knife (10), into a separating position, wherein on moving into the separating position the veneering material (K) is pushed by the clamping element (12) against the counter bearing (11) into the clamping position and is clamped between the clamping element (12) and the counter bearing (11), and wherein then the clamped veneering material (K) is separated by the blade (10a) during continued movement of the separating knife (10) in the direction of the counter bearing (11) with simultaneous elastic deformation or displacement of the clamping element (12).

15. Method according to Claim 14 characterised in that the separating device (1) is moved along with the edge band (K), in particular is linearly displaced or pivoted.