Method and device for breaking out a planar workpiece from a material sheet

Abstract

In a device for breaking out a workpiece (3) from a material sheet (2) through an opening (4) of a die (1) by means of a breakout tool (5), the die (1) is to have a plug-in unit (22), wherein a breakout module (9.1-9.4) is insertable into the plug-in unit (22), wherein the breakout module (9.1-9.4) is composed of an insert (10) and of a module lobe (11), wherein the insert (10) has a surface (16) and a shearing edge (17), wherein the shearing edge (17) toward a bearing face (12) of the module lobe (11) configures an offcut length (18), and wherein the offcut length has a height (h) of 0.8 mm to 1.8 mm, and preferably of 1.5 mm.

Claims

1. Device for breaking out a workpiece (3) from a material sheet (2) through an opening (4) of a die (1) by means of a breakout tool (5), wherein the die (1) has a plug-in unit (22), wherein a breakout module (9.1-9.4) is insertable into the plug-in unit (22), wherein the breakout module (9.1-9.4) is composed of an insert (10) and of a module lobe (11) having a bearing face (12) for receiving the workpiece (3) after breaking out, wherein the insert (10) has a surface (16) and a shearing edge (17), wherein the shearing edge (17) faces toward the bearing face (12) and an offcut surface extending from the shearing edge (17) to the bearing face (12) and defining an offcut length (18), and wherein the offcut length has a height (h) from the surface (16) to the bearing face (12) of 0.8 mm to 1.8 mm, and wherein the module lobe (11) is at least partially resilient.

2. Device according to claim 1, wherein the height (h) is 1.5 mm.

3. Device according to claim 1, wherein the breakout module (9.1-9.4) which reduces an available width (w) of the opening (4) is disposed in the opening (4).

4. Device according to claim 1, wherein at least two breakout modules (9.1-9.4) are provided in the opening (4), wherein the breakout modules (9.1-9.4) are mutually opposite.

5. Device according to at least claim 1, wherein the module lobe (11) has a beveled and/or rounded sliding face (14).

6. Device according to claim 1, wherein the module lobe (11) opposite the bearing face (12) configures a collar (19) which leads into a main body (20) of the insert (10).

7. Device according to claim 1, wherein the breakout tool (5) has breakout pins (6) or breakout strips (7) by way of which the workpiece (3) is impingeable with pressure.

8. Device according to claim 1, wherein the module lobe (11) defines an upwardly facing rounded sliding face which is convex toward the workpiece (3).

9. Device according to claim 1, wherein the offcut surface is a substantially vertical side surface connecting the surface (16) and the bearing face (12).

10. Device according to claim 9, wherein the offcut surface is connected to the surface (16) through the shearing edge (17).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages, features, and details of the invention are derived from the description hereunder of preferred exemplary embodiments, and by means of the drawing in which:

(2) FIGS. 1a, 1b, 1c and 1d shows a sequence diagram of the method according to the invention for breaking out a workpiece;

(3) FIG. 2 shows a side view of a breakout module according to the invention;

(4) FIG. 3 shows a plan view of the breakout module in FIG. 2;

(5) FIG. 4 shows a plan view of part of a lower breakout tool of a device according to the invention for breaking out a workpiece.

DETAILED DESCRIPTION

(6) A die 1 can be seen in FIG. 1, a planar material of a material sheet 2 to be processed bearing on said die 1. For example, said material sheet 2 can be composed of paper, cardboard, corrugated cardboard, wood, plastics, or the like. A workpiece 3 is to be broken out of this material sheet 2, specifically in the context of an opening 4 in the die 1. A breakout tool 5 is provided to this end.

(7) The workpiece 3 can be an offcut or else a blank, that is to say, for example, a blank for a folding box, a part of a printing sheet, of a utility or consumer product, or the like. Many possibilities are conceivable here, all of which are in the scope of the invention.

(8) As is illustrated in FIG. 4, breakout modules 9.1 to 9.4 which are composed substantially of an insert 10 and a module lobe 11 are inserted into plug-in units 22 in side walls 8 of the opening 4 in the die 1. Said breakout modules 9.1 to 9.4 are illustrated in an enlarged manner in FIGS. 2 and 3.

(9) The insert 10 in the use position of the breakout modules 9.1 to 9.4 has a surface 16 and a shearing edge 17, wherein the shearing edge 17 toward a bearing face 12 of the module lobe 11 configures an offcut length 18, and wherein the offcut length has a height h of 0.8 mm to 1.8 mm, and particularly preferably of 1.5 mm. In other words, the surfaces 16 of the inserts 10 of the breakout modules 9.1 to 9.4 thus terminate flush with a depositing face 13 of the die 1, or lie in the plane of the depositing face 13, respectively. The bearing faces 12 and the module lobes 11 of the breakout modules 9.1 to 9.4 adhere to a spacing from the surfaces 16 of the inserts 10, or from the depositing face 13 of the die 1, respectively, of in each case approximately 0.8 mm to 1.8 mm, and particularly preferably 1.5 mm, so that the workpiece 3 after breaking out can first be deposited on said bearing faces 12 and said module lobes 11.

(10) The module lobe 11 opposite the bearing face 12 has a collar 19 which leads into a main body 20 of the insert 10. The main body 20 in turn transitions into a surface 21 which is disposed so as to be substantially parallel with the surface 16.

(11) The operating mode of the present invention will be explained in more detail by means of FIG. 1. According to FIG. 1a, the material sheet 2 having the workpiece 3 to be broken out is located on the depositing face 13 of the die 1. The opening 4 of the die 1 is obscured by the material sheet 2. The breakout tool 5 having breakout pins 6 or breakout strips 7, respectively, is located above the material sheet 2.

(12) According to FIG. 1b, the breakout tool 5 is now lowered such that the breakout pins 6 or breakout strips 7, respectively, can break the workpiece 3 out of the material sheet 2. The workpiece 3 then bears on the module lobes 11 of the breakout modules 9.1 to 9.4.

(13) In the case of the breakout tool 5 being lowered further, the workpiece 3 is pushed over oblique or rounded sliding faces 14, respectively, of the module lobes 11, wherein the workpiece 3 is compressed in a concave manner. This is to say that the workpiece 3 bulges in a direction that faces away from the breakout tool 5, and thus in the direction of pressure. Bending of the workpiece 3 arises by way of this constriction so that said workpiece 3 can be pushed through the constriction of the available width w of the opening 4, as will be described hereunder.

(14) As soon as the workpiece 3 has reached a lower end 15 of the module lobes 11, the tension which has been generated by the bending of the workpiece 3 is cancelled, since the opening 4 henceforth is sufficiently wide again. Said cancellation of the tension arises abruptly, however, such that the workpiece 3 is ejected downward.

(15) It is indicated in FIG. 1d that the module lobes 11 in the case of workpieces from a comparatively hard or thick material, which on account thereof allow no or only minor bending, are designed so as to be resilient. However, said resilience has a similar centrifugal effect as has been described above in the context of the comparatively resilient workpieces 3 in FIG. 1c.

(16) The breakout tool 5 presently can operate at two pressure stages. The workpiece 3 is separated from the material sheet 2 in a first pressure stage. The pressure of the breakout tool 5 is subsequently increased, in order for the workpiece 3 to be guided as fast as possible past the module lobes 11.

(17) The workpiece 3 is indicated as being within the opening 4 in FIG. 4. The plug-in units 22 are located laterally in the side walls 8 of the respective breakout modules 9.1 to 9.4. The breakout pins 6 and breakout strips 7 are also indicated.

(18) While only one preferred exemplary embodiment of the invention has been described and illustrated it is obvious to a person skilled in the art that numerous modifications can be added without departing from the concept and the scope of the invention.