MULTI-PART LONG KNIFE

Abstract

A multi-part long knife (10) is provided for cutting rubberized and non-rubberized steel cord, rubber sheets with or without fiber reinforcement, industrial textiles, steel sheets and non-ferrous metals. The multi-part long knife (10) includes an elongated knife carrier (12), on which at least one elongated blade (16), having a cutting edge (18), is held. The knife carrier (12) has a clamping strip (14), which is guided in a recess (22) of the knife carrier (12) in a clamping direction (K). A receptacle (46) for the blade (16) is formed between the knife carrier (12) and the clamping strip (14), which clamping strip (14) is guided in the recess (22). A first clamping surface (50) is formed on the knife carrier (12) and a second clamping surface (52), opposite the first clamping surface (50), is formed on the clamping strip (14), between which the blade (16) can be clamped.

Claims

1. A multi-part long knife for cutting rubberized and non-rubberized steel cord, rubber sheets with or without fiber reinforcement, industrial textiles, steel sheets and non-ferrous metals, the knife comprising: at least one elongate blade with a cutting edge; an elongate knife carrier on which the at least one elongate blade with the cutting edge is held, wherein the knife carrier comprises a clamping strip which is guided in a recess of the knife carrier in a clamping direction, wherein a receptacle for the blade is formed between the knife carrier and the clamping strip guided in the recess, wherein a first clamping surface is formed on the knife carrier and a second clamping surface opposite the first clamping surface is formed on the clamping strip, between which the blade can be clamped.

2. The long knife according to claim 1, wherein the clamping surfaces extend parallel to a longitudinal direction and are inclined to each other.

3. The long knife according to claim 2, wherein an angle between the first clamping surface and the second clamping surface is between 1 and 7.

4. The long knife according to claim 1, wherein the blade comprises contact surfaces for contact with the clamping surfaces, wherein the angle of the contact surfaces relative to each other corresponds to the angle of the clamping surfaces to each other or is smaller or larger than this.

5. The long knife according to claim 1, wherein the clamping surfaces are each inclined at an angle of 35 to 55, to the clamping direction.

6. The long knife according to claim 1, wherein a bottom of the receptacle is formed at least in sections by a stop surface of the clamping strip running substantially in a clamping direction, wherein the blade has a corresponding surface.

7. The long knife according to claim 6, wherein the bottom of the receptacle is bounded at least in sections by a boundary surface running substantially perpendicular to the clamping direction, which boundary surface is formed on the knife carrier.

8. The long knife according to claim 1, wherein at least one guide for the clamping strip is provided on the knife carrier and the clamping strip comprises at least one projection projecting into the guide.

9. The long knife according to claim 8, wherein: a bottom of the receptacle is formed at least in sections by a stop surface of the clamping strip running substantially in a clamping direction, wherein the blade has a corresponding surface; and the stop surface is formed on the projection.

10. The long knife according to claim 1, further comprising a plurality of clamping elements, wherein the clamping strip is held on the knife carrier via the plurality of clamping elements arranged next to each other in the longitudinal direction, wherein the clamping elements are guided by the projection.

11. The long knife according to claim 10, wherein the clamping elements are formed as screws which are rotatably held in the knife carrier or in the clamping strip and engage in a thread provided on the clamping strip or on the knife carrier.

12. The long knife according to claim 1, wherein an angle between the first clamping surface and the second clamping surface is between 1 and 7

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In the drawings:

[0031] FIG. 1 is a perspective view of a long knife according to the invention;

[0032] FIG. 2 is a plan view of the long knife of FIG. 1;

[0033] FIG. 3 is a sectional view of the long knife of FIG. 1;

[0034] FIG. 4 is a sectional view of the long knife of FIG. 1 in the region of the blade;

[0035] FIG. 5 is a sectional view of the long knife of FIG. 1 in the region of the clamping strip and the blade;

[0036] FIG. 6 is a sectional view of the knife carrier of the long knife of FIG. 1;

[0037] FIG. 7 is a sectional view of the clamping strip of the long knife of FIG. 1; and

[0038] FIG. 8 is a sectional view of the blade of the long knife of FIG. 1.

DESCRIPTION OF PREFERRED EMBODIMENTS

[0039] Referring to the drawings, FIGS. 1 to 3 show a concrete embodiment of a long knife 10 according to the invention for cutting rubberized and non-rubberized steel cord, rubber sheets with or without fiber reinforcement, industrial textiles, steel sheets and non-ferrous metals for a cutting device, not shown. The long knife 10 has a knife carrier 12, a clamping strip 14 and a blade 16 having a cutting edge 18. The long knife 10 is inserted into a cutting device such that the cutting edge 18 moves relative to a second, corresponding cutting edge in a cutting direction S and a material located in the cutting gap between the cutting edges can be cut.

[0040] The knife carrier 12 has a substantially cuboid base body 20 which extends in a longitudinal direction L (see also FIG. 6). Means for mounting the long knife 10 are provided in a cutting device on the base body 20, not shown here. A recess 22 is formed on the base body 20, which recess extends in a longitudinal direction L running perpendicular to the cutting direction S over the entire base body 20.

[0041] The recess 22 extends from a surface 24 of the base body 20 running in the cutting direction S into the base body, wherein the recess 22 is directed away from a front edge 26 in the cutting direction S. The recess 22 has a guide 28 in the form of a groove having a rectangular cross-section extending transverse to the cutting direction in the base body 20 and in the longitudinal direction L over the entire length of the base body. The guide 28 opens into a plurality of holes 30 extending through the base body 20. From the surface 32 opposite the surface 24, a plurality of clamping elements 34 formed as screws having an external thread extend through the holes 30 and the guide 28 in the recess 22. The screw heads 36 are countersunk in recesses 38 provided on the surface 32 of the base body 20 so that they do not protrude beyond the surface 32. The screw heads 36 in each case lie at the bottom 40 of the recesses 38.

[0042] The clamping strip 14 (see also FIG. 7) extends in the longitudinal direction L over the entire length of the knife carrier 12 and has a projection 42 which protrudes into the guide 28 in a clamping direction running transversely to the longitudinal direction L and transversely to the cutting direction S, so that the clamping strip 14 is displaceably mounted on the knife carrier 12 in the clamping direction K. A plurality of holes 44 corresponding to the holes 30 and the clamping elements 34 are provided in the clamping strip 14, which plurality has internal threads corresponding to the threads of the clamping elements 34. The clamping elements 34 extend into the holes 44 and into the internal threads. The clamping strip 14 can be displaced parallel to the clamping direction against the knife carrier 12 by turning the clamping elements 34.

[0043] A receptacle 46 for the blade 16 is formed between the clamping strip 14 and the knife carrier 12, which receptacle extends from an insertion opening 48 at the edge 26 obliquely between knife carrier 12 and clamping strip 14. The width of the receptacle 46 is reduced by moving the clamping strip 14 in the clamping direction K, so that the blade 16 is clamped in the receptacle 46 between the clamping strip 14 and the knife carrier 12.

[0044] The receptacle 46 is closed by a first clamping surface 50 provided on the knife carrier 12 and a second clamping surface 52 and a bottom 54 provided on the clamping strip 14. The bottom 54 is bounded by a boundary surface 56 provided on the knife carrier 12 and running perpendicular to the clamping direction K, and formed by a stop surface 58 provided on the clamping strip 14 and running in the clamping direction K.

[0045] The first and the second clamping surface 50, 52 run at an angle between 40 and 50 to the cutting direction S, wherein the clamping surfaces 50, 52 enclose an angle between 3 and 5, so that the receptacle 46 widens away from the insertion opening 48 in the direction of the bottom 54.

[0046] The blade 16 has surfaces 60, 62 corresponding to the clamping surfaces 50, 52 which are also inclined towards each other and enclose an angle of approximately 3 to 5. In particular, the angle enclosed by the surfaces 60, 62 corresponds to the angle between the clamping surfaces 50, 52 or is slightly greater or smaller than this.

[0047] A cutting edge 18 is provided at a rear end of the blade 16 in the insertion direction E, which cutting edge is formed by two partial surfaces 64, 66 at an angle to each other, wherein a first partial surface 64 runs in the cutting direction S. The second partial surface 66 runs substantially perpendicular to the first partial surface 64 or to the cutting direction S. Two substantially mutually perpendicular surfaces 68, 70 are provided at the opposite front end, which surfaces are aligned adjacent to the boundary surface 56 or to the stop surface 58. The transition between the surface 70 associated with the stop surface 58 and the second surface 68 is rounded (see in particular FIGS. 4, 5 and 8).

[0048] For mounting the blade 16, the clamping strip 14 is displaced such that the receptacle 46 is sufficiently wide to receive the blade 16. Subsequently, the blade 16 is inserted in the insertion direction E into the receptacle 46 until the second surface 62 rests against the second clamping surface 52 and the second surface 70 against the stop surface 58. After the insertion of the blade 16, the clamping strip 14 is moved by rotating the clamping elements 34 in the clamping direction K against the knife carrier 12 until the first surface 60 rests against the first clamping surface 52. By further rotation of the clamping elements 34, the clamping strip 14 is pre-tensioned against the knife carrier 12 and the blade 16 is clamped in the receptacle 46 between the clamping strip 14 and the knife carrier 12.

[0049] As can be seen in particular in FIGS. 4 and 5, the blade 16 is clamped between the clamping surfaces 50, 52 and the stop surface 58 without play, wherein the blade 16 in the clamping position shown is spaced from the boundary surface 56.

[0050] The blade 16 in this case is clamped such that the cutting edge 18 protrudes beyond the adjacent surface 24, so that there is space for the cut material below the blade 16 or the cutting edge 18. FIG. 5 shows a state in which an upper edge of the blade 16 projects beyond an upper side of the knife carrier. However, this projection is abraded after insertion of the blade 16, so that a flat surface is obtained, over which the material to be cut can be moved smoothly.

[0051] In particular, the clamping elements 34 are countersunk in such a way that even with usage-related wear on the surfaces 24, 32, they do not project beyond the surfaces 24, 32. Also, the receptacle 28 and thus the position of the blade 16 are independent of a usage-related wear on the surfaces.

[0052] The invention is not limited to one of the above-described embodiments, but can be modified in many ways. Thus, for example, the knife carrier can not only have a receptacle for a blade, but also a plurality of receptacles with accordingly many clamping strips. Preference is given to an embodiment having two receptacles for two blades, which are arranged under each other or diagonally opposite each other. When a blade is worn, the other blade can then be used by first turning the long knife, before a completely new knife or at least an exchange of the blades is required.

[0053] All features and advantages arising from the claims, the description and the drawing, including design details, spatial arrangements and method steps can be essential to the invention both in itself and in various combinations.

[0054] While specific embodiments of the invention have been shown and described in detail to illustrate the application of the principles of the invention, it will be understood that the invention may be embodied otherwise without departing from such principles.