CUTTING TOOL FOR CUTTING FLAT MATERIALS

Abstract

Cutting tool for flat materials. The cutting tools includes a band-shaped base body which has on one longitudinal side a working region with cutting teeth and on an other longitudinal side a supporting region with a supporting surface. The cutting teeth are formed with tips and include cutting sides emanating from the tips at an angle a to one another. In a longitudinal direction of the working region, the tips of adjacent cutting teeth have different distances to the supporting surface.

Claims

1. A cutting tool for flat materials, comprising: a band-shaped base body which has on one longitudinal side a working region with cutting teeth and on an other longitudinal side a supporting region with a supporting surface, wherein the cutting teeth are formed with tips and include cutting sides emanating from the tips at an angle to one another, wherein, in a longitudinal direction of the working region, the tips of adjacent cutting teeth have different distances to the supporting surface.

2. The cutting tool according to claim 1 being formed from hardenable steel and the flat materials comprising cardboard, corrugated cardboard, honeycomb packaging, plastic panels.

3. The cutting tool according to claim 1, wherein the supporting surface comprises a plurality of supporting surfaces.

4. The cutting tool according to claim 1, wherein the tips have radii up to 2.0 mm and the angle is 60 to 90.

5. The cutting tool according to claim 4, wherein the cutting teeth comprise tips having a radius of 1 mm or less.

6. The cutting tool according to claim 1, wherein the different distances are 0.5 to 2.0 mm.

7. The cutting tool according to claim 1, wherein the cutting sides of the teeth have a same angle of 65 to 75.

8. The cutting tool according to claim 1, wherein the cutting sides have a cutting angle of 40 to 55 in cross-section.

9. The cutting tool according to claim 1, wherein the cutting sides have a hardness greater than 360 HB or 380 HV up to a depth of 0.5 mm.

10. The cutting tool according to claim 1, wherein the working region with the cutting teeth has at least one of a wear-resistant and/or friction-reducing surface layer.

11. A cutting tool for cutting a flat material, comprising: a band-shaped base body having an upper and a lower longitudinal extent, a height extending between the upper and lower longitudinal extent, and a thickness perpendicular to the height and the upper and lower longitudinal extents; and a working region having a plurality of teeth formed along the upper longitudinal extent and a supporting region formed along the lower longitudinal extent; wherein the plurality of teeth have tooth tips and cutting sides extending from respective tooth tips at an angle to one another, and wherein the tooth tips of successive teeth in the working region are located at different distances from the support surface.

12. The cutting tool according to claim 11, wherein a first tooth tip of a first of the successive teeth in the working region is located at a first distance from the support surface and a second tooth tip of a second of the successive teeth in the working region, which is adjacent the first of the successive teeth, is located at a second distance from the support surface, the second distance being less than the first distance.

13. The cutting tool according to claim 12, wherein a tooth trough is formed between adjacent teeth where facing cutting surfaces of the adjacent teeth meet, and wherein, for each of the successive teeth in the working region, the tooth troughs are located at a same distance from the support surface.

14. The cutting tool according to claim 11, wherein a first tooth tip of a first of the successive teeth in the working region is located at a first distance from the support surface, a second tooth tip of a second of the successive teeth in the working region, which is adjacent the first of the successive teeth, is located at a second distance from the support surface, and a third tooth tip of a third of the successive teeth, which is adjacent the second of the successive teeth, is located at a third distance from the support surface, and wherein the third distance is less than the first distance and the second distance is less than the third distance.

15. The cutting tool according to claim 11, wherein a first tooth tip of a first of the successive teeth in the working region is located at a first distance from the support surface, a second tooth tip of a second of the successive teeth in the working region, which is adjacent the first of the successive teeth, is located at a second distance from the support surface, a third tooth tip of a third of the successive teeth, which is adjacent the second of the successive teeth, is located at a third distance from the support surface, and a fourth tooth tip of a fourth of the successive teeth, which is adjacent the fourth of the successive teeth, is located at a fourth distance from the support surface, and wherein the third distance is less than the first distance, the second distance is less than the third distance, and the fourth distance is the same as the second distance.

16. The cutting tool according to claim 11, wherein a first tooth tip of a first of the successive teeth in the working region is located at a first distance from the support surface, a second tooth tip of a second of the successive teeth in the working region, which is adjacent the first of the successive teeth, is located at a second distance from the support surface, a third tooth tip of a third of the successive teeth, which is adjacent the second of the successive teeth, is located at a third distance from the support surface, a fourth tooth tip of a fourth of the successive teeth, which is adjacent the fourth of the successive teeth, is located at a fourth distance from the support surface, and a fifth tooth tip of a fifth of the successive teeth, which is adjacent the fifth of the successive teeth, is located at a fifth distance from the support surface, and wherein the third distance is less than the first distance, the second distance is less than the third distance, the fourth distance is the same as the second distance. and the fifth distance is the same as the first distance.

17. The cutting tool according to claim 11, wherein the tooth tips have radii up to 2.0 mm.

18. The cutting tool according to claim 17, wherein the tooth tips have radii 1 mm or less.

19. The cutting tool according to claim 11, wherein a tooth trough is formed between adjacent teeth where facing cutting surfaces of the adjacent teeth meet, and wherein, for each of the successive teeth in the working region, the tooth troughs are located at a same distance from the support surface.

20. The cutting tool according to claim 11, wherein the plurality of teeth have tooth tips and cutting sides extending from respective tooth tips in a direction of the thickness at an angle to one another, and wherein the tooth tips of successive teeth in the working region are located at different distances from the support surface, and wherein the angle is 60 to 90 and the angle is 40 to 55.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The present invention is further described in the detailed description which follows, in reference to the noted plurality of drawings by way of non-limiting examples of exemplary embodiments of the present invention, in which like reference numerals represent similar parts throughout the several views of the drawings, and wherein:

[0047] FIG. 1 shows a cutting tool according to the prior art;

[0048] FIG. 2 shows an embodiment of a cutting tool according to the invention for cutting flat materials;

[0049] FIG. 3 shows another embodiment of the cutting tool according to the invention; and

[0050] FIG. 4 shows a cross-sectional view of the cutting tool.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0051] The particulars shown herein are by way of example and for purposes of illustrative discussion of the embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the present invention. In this regard, no attempt is made to show structural details of the present invention in more detail than is necessary for the fundamental understanding of the present invention, the description taken with the drawings making apparent to those skilled in the art how the several forms of the present invention may be embodied in practice.

[0052] The following list of reference numerals is intended to provide easier association of the components of the cutting tool according to the invention: [0053] S Cutting tool [0054] 1, 1, 1 Working region [0055] 11, 11, 11 Cutting teeth [0056] 111, 111, 111 Tips of the cutting teeth [0057] 112, 112, 112 Cutting sides [0058] Angle of opposing cutting sides in longitudinal direction [0059] Angle of opposing cutting sides in thickness direction [0060] 2, 2, 2 Supporting region [0061] 22, 22 Supporting surface(s) [0062] A, A, A Distance of the cutting tooth tips to the supporting surface [0063] B, B, B Tooth length between the furthest protruding tooth tips and the tooth base

[0064] FIG. 1 schematically illustrates an essentially known cutting tool S for cutting flat materials.

[0065] A band-shaped base body comprises a working region 1 with teeth 11, wherein cutting sides 112 emanate from the tooth tips 111. Flanks of tooth tips 11 have or form an angle to one another.

[0066] A supporting region 2 of the base body has a supporting surface 22, to which the tips 111 of the cutting teeth 11 have an identical distance A.

[0067] A given tooth shape with a defined spacing of the teeth 11 in a longitudinal direction results in a maximum tooth length B between the tooth tips 111 and the tooth base.

[0068] During a punching of a flat material, the tips 111 of the teeth 11 of the tool S penetrate a flexible, pliable support of the flat material at least over a distance with the dimension B.

[0069] In FIG. 2, an embodiment of a cutting tool S according to the invention is illustrated schematically.

[0070] A cutting region 1 of the band-shaped base body has a tooth 11 arranged in a longitudinal region between successive furthest protruding teeth 11, which have tooth tips 111 that protrude a distance A from supporting surface 22. Cutting sides 112 of successive teeth 11 are adjacent cutting sides 112 of tooth 11, which has a tooth tip 111 that protrudes a smaller distance A from supporting surface 22 and, thus, is recessed. The cutting sides 112 and 112 meet at a tooth base or trough.

[0071] When cutting tool S is lowered onto the flat material, or in a relative movement of this type, protruding tooth tips 111 having a large distance A from supporting surface 22, 22 first penetrate the flat material, after which a cut is created via cutting sides 112 with low loading of the flat material until contact is made with adjacent recessed cutting tips 111 of cutting teeth 11.

[0072] However, tips 111 of cutting teeth 11 that have smaller distance A to supporting surface 22, 22 are also spaced from one another and penetrate the flat material without lasting deformation, and complete the cutting of the material via cutting sides 112.

[0073] As shown in FIG. 2, cutting sides 112 extend from tips 111 at an angle a to each other. By way of non-limiting example, angle can be 60 to 90, and preferably 65 to 75. Further, cutting sides 112 can extend from tips 111 at angle, and preferably at angle .

[0074] With cutting blade S according to the invention, not only can an even cut of the flat material be achieved, the extent of the penetration by tooth tips 111 of cutting tool S into the support of a flat material is reduced to a dimension B, which results in an increase of the resilience of the substrate in the punching operation.

[0075] Dimension B is derived from the largest distance of the furthest protruding tooth tips 111 over the tooth base.

[0076] As can be seen from FIG. 3, further recessed teeth 11 can be arranged in working region 1 between furthest protruding teeth 11 and recessed teeth 11 in a further embodiment of a punching tool S according to the invention.

[0077] All of the advantages notwithstanding, a penetration depth B of protruding teeth 11 into a support of a flat material is further reduced in such an embodiment of the cutting teeth 11, 11, 11 in working region 1.

[0078] FIG. 3 shows that cutting sides 112 extend from tips 111 at an angle a to each other. By way of non-limiting example, angle can be 60 to 90, and preferably 65 to 75. Further, cutting sides 112 can extend from tips 111 at an angle to each other, preferably at angle , and cutting sides 112can extend from tips 111 at an angle to each other, preferably angle .

[0079] As shown in FIG. 4, tips 111, as well as tips 111 (in the embodiment of FIG. 2) or tips 111 and 111 (in the embodiments of FIG. 3), can have, in the thickness direction, cutting sides extending from the respective tips at an angle to each other. In embodiments, angle can be 40 to 55.

[0080] Cutting tools according to the invention have, particularly in rotary punching, significant advantages, including smooth machine operation, a reduced bending load on the teeth, high dimensional accuracy of the cuts and the like.

[0081] It is noted that the foregoing examples have been provided merely for the purpose of explanation and are in no way to be construed as limiting of the present invention. While the present invention has been described with reference to an exemplary embodiment, it is understood that the words which have been used herein are words of description and illustration, rather than words of limitation. Changes may be made, within the purview of the appended claims, as presently stated and as amended, without departing from the scope and spirit of the present invention in its aspects. Although the present invention has been described herein with reference to particular means, materials and embodiments, the present invention is not intended to be limited to the particulars disclosed herein; rather, the present invention extends to all functionally equivalent structures, methods and uses, such as are within the scope of the appended claims.