FI91734C - Cutting device for wire stripping machine - Google Patents

Abstract

A cutting device for a wire removing machine for cutting through tie wires of bales, in particular cellulose bales, has essentially two elongate cutters (5, 6) that can move back and forth in relation to each other, each provided at their cutting edges with a row of regularly spaced teeth (16, 17) having an undercut on their front flanks, in the cutting direction. In order to precisely define the moment when the wires are cut and at the same time ensure that a gripping device has already reliably clamped the tie wires before they are cut through by the cutting device, the front flanks (18, 19) of the teeth (16, 17) have at their lower end, in the area of the tooth root, a receiving pocket (21, 22) for at least one tie wire, the back ends of the receiving pockets (21, 22) forming knife-edges (24). The sections of the front flanks (18, 19) of the teeth (16, 17) that extend between the tip (20) of the tooth and the corresponding receiving pocket (21 or 22) form blunt slide edges.

Description

1 91734

Cutting device for wire stripper

The invention relates to a cutting device for cutting the binding yarns of bales, in particular cellulose bales, for a wire stripping machine, the cutting device comprising two elongate blades movable back and forth relative to each other, each of which has a row of teeth on each side of it. 10 boats with an internal notch in the cutting direction on the front sides.

In a known cutting device of this kind (DE patent publication 28 16 912), the front sides of the teeth 15 of each blade bar are constructed as blades over their entire height.

Such a cutting device is used, for example, in a wire unwinding machine known from DE patent 37 07 966.

The object of the invention is to develop a known cutting device 25 so that the cutting moment can be precisely determined in order to ensure that the gripping device has already reliably adhered to the binding wires before the cutting device cuts them.

According to the invention, this object is achieved in that the front sides of the teeth, at the lower end of the tooth leg area each have a receiving pocket for at least one binding wire, the rear ends of the receiving pockets are constructed as blades, and the front sides of the teeth are .

2,91734

In the cutting device according to the invention, the binding wires to be cut are pulled from the dull sliding edges towards the tooth legs, up to the receiving pocket. The cutting wires drawn by the receiving pockets are cut only when the blades 5, which are built in the cutting direction as seen at the rear of the receiving pockets, are so close to each other that their spacing is smaller than the diameter of the wire. The onset of the cutting operation can thus be precisely defined in the cutting device according to the invention and matched to the main stages of the gripping device cooperating with the cutting device.

The receiving pockets are primarily constructed higher than the diameter of the wire to be cut, so that it can be completely carried into the respective receiving pocket.

The receptacle pockets should be constructed deeper than half the diameter of the wire to be cut, so that two opposing receiving pockets can always be placed completely around the respective wire.

The ends of the receiving pockets constructed as blades may be constructed in an arcuate shape, primarily in a semicircular shape.

25 The ends of the receiving pockets, built into blades, expediently extend over their entire height, so that a perfect and reliable cut can be made.

30 The blades can be formed by back grinding.

The receiving pockets are primarily in all the teeth of the blade bar, so that the cutting device according to the invention can reliably grip and cut the binding wires 35 at the most extreme points of the mydsk.

li 3 91734

At the top of the teeth of each blade bar, oblique surfaces are primarily constructed, extending downwards from the highest point of each tooth in the extension of the front side, at a certain angle to the side of the tooth foot. In this case, the source position of the blade bar can be set 5, in which the two adjacent teeth of the always opposite blades form a roof-shaped unit in which the wire slides to the side and is guided into the respective tooth opening.

10 Keksintdå esitetåån in the drawing by way of example and Si-O will be explained in detail with Referring to the drawing, in which Figure 1 esittåå sectional view of the cutting device, Figure 2 esittåå a partial general view of Figure January 15 teråå arrow II - II in Figure 3 esittåå sectional view along line 2 in Figure III - III; Fig. 4 is a schematic sectional side view of a cutting device with the teeth in the open position for receiving the wire; Fig. 5 is a sectional view similar to Fig. 4, in which the wire located inside the receiving pocket 25, Fig. 7 is a similar sectional view in which the wire is already cut in the blade position.

According to Fig. 1 of the drawing, the cutting device comprises a beam 1 of terå-30, which is fastened by means of screws 2 only to the machine body 3 shown in a sectional view.

The blade bar essentially comprises a holder 4 having a U-shaped cross-section, as well as two elongate blades 5 and 6, 35 which can be guided longitudinally displaceably between the edges 7 and 8 of the U-shaped holder 4.

4,91734

In order to improve the sliding properties, bearing metal strips 9 and 10 are placed between the sides 7 and 8 of the U-shaped holder and between the two blades 5 and 6.

To adjust the clearance between each of the blades 5 and 6, screws 11 are distributed over the entire length of the blade bar 1, extending through both sides 7 and 8 of the U-shaped holder 4 and through the blades 5 and 6, and having a self-locking lock 13 at the threaded end. By tightening the nut 13 and loosening the nut 10, the gap between the two blades can be adjusted precisely or performed after the blade bar 1 has been adjusted or deformed.

In order to allow longitudinal displacement of each of the blades 5 and 6 despite the through-going screws 11, each of the blades 5 and 6 has elongate holes 14 and 15 in the region of the screws 11 which are constructed at least as long as those of both blades 5 and 6. attacks. The drive device of each of the blades 5 and 6 may be a waste-20 impact cylinder not shown in the drawing.

In the exemplary embodiment shown in the drawing, both blades 5 and 6 move with respect to the U-shaped holder by the same distance and in opposite directions with respect to each other. But there is also the possibility that one of the blades is in place and only the other blade is moved.

Each of the steels 5 and 6 has teeth 16 and 17 at regular intervals on their cutting side, the front sides 30 18 and 19 of which pass past each other in a scissor manner, at a certain angle to each other.

The front sides 18 and 19 of the teeth extend diagonally backwards from the top of the tooth 20 in the respective plane of the blade, provided with a corresponding rear segment, whereby the front sides 18 and 17 of the teeth 16 and 17 the other areas of the sides 18 and 19 do not come into contact with each other until the blades 5 and 6 move forward.

5 The front sides 18 and 19 of the cooperating teeth 16 and 17 have at their lower ends, in the region of each tooth leg, a receiving pocket 21 and 22 which meet backwards some distance from each of the front sides 18 and 19. The receiving pockets are then higher than those of the wire 10 to be cut. diameter and deeper than half the diameter of the wire.

The rearward-facing ends of the receiving pockets 21 and 22 in the cutting direction are constructed as blades 24, which are provided by means of rear grinding 25.

In the part between the upper part 20 of each tooth and the receiving pocket 21 and 22, the front sides 18 and 19 of the teeth 16 and 17 are constructed as dull sliding edges. Thus, according to this design feature 20, the cutting wires can be cut only in the region of the receiving pockets 21 and 22 by means of the blades 24, while the dull sides 18 and 19 only grip the threads to be cut and pull them in the direction of the receiving pockets 21 and 22 25 of the teeth 16 and 17 of each blade 5 and 6. sloping surfaces 28 are built into the upper teeth 20, extending downwardly from the highest point of each tooth 16 and 17 in the extension of the front sides 18 and 19, at a certain angle to the side of the tooth foot.

30

Figures 4-7 show a few relative positions of the blades 5 and 6 relative to each other.

Figure 4 shows the starting position of the blades 5 and 6, in which each of the two adjacent teeth 16 and 17 always forms a roof-like unit 26, and in which the two oblique surfaces 28 of the upper teeth abutting against each other determine the slope of the roof. As the blade beam travels towards the bale provided with the binding wires, then each wire 23 hit by such a roof-shaped unit 26 slides sideways, and each wire of the wire 5 is guided into the tooth opening.

When each of the blades 5 and 6 is now moved by one tooth pitch relative to each other, then each wire 23 (Fig. 5) closes inside the two front sides 18 and 19 of the two cooperating teeth 16 and 17 10. Because the sides 18 and 19 are dull, the wire 23 does not break in the area of the sides, but is pulled in the direction of the receiving pockets 21 and 22.

Once the wire 23 has entered the area of the receiving pockets 21 and 22, the two receiving pockets 21 and 22 (Fig. 6) which are immediately opposed to each other form a circularly closed area 27, whereby the wire 23 is precisely positioned between the blades 24.

As the blades 5 and 6 continue to move relative to each other, the two blades 24 move past each other and cut off the wire 23. Such a position of both blades 5 and 6 passing the cutting position is shown in Figure 7. When the wire 23 is cut, both blades 5 and 6 can be driven. to its home position (Fig.4).

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Claims (8)

1. The cutting device is provided with a wire separating machine for cutting of the binding wires receiving bales, in particular cellulose bales, which cutting device comprises two elongated bites which move back and forth in relation to each other and which each have on their cutting side a series of teeth at a regular distance from each other. and successive teeth with a notch in the direction of cutting on the fronted flank, characterized in that in the lower spirit of the tooth root region there is a receiving flange (18, 19) in the lower spirit pocket (21, 22) receives at least one binding thread (23), that the rear spirits of the receiving pockets (21, 22) are formed into bites (24), and Γ.0 that the front flanks (18, 19) of the teeth (16, 17) in the area between the upper portion (20) of the tooth and each receiving pocket (21, 22) formed into blunt sliding edges. 2. A cutting device according to claim 1, characterized in that the receiving pockets (21, 22) are designed to be higher than the diameter of the wire to be cut. 3. A cutting device according to claim 1 or 2, characterized in that the receiving pockets are formed deeper than half the diameter of the thread to be cut. A scoring device according to any one of claims 1-3, characterized in that the spirits of the receiving pockets (21, 22) are formed as bites (24) in arc shape. 5. A scoring device according to claim 4, characterized in that the spirits of the receiving pockets (21, 22) are formed as bites of approximately semi-circular shape. A scoring device according to any one of claims 1-5, characterized in that the spirits of the receiving pockets (21, 22) are formed into bites (24) and extend over the entire height of the fasteners. A scoring device according to any one of claims 1-6, characterized in that the bites (24) are formed by back sloping. 20 8. A cutting device according to any one of claims 1-7, characterized in that the cutting surfaces (28) formed in the upper parts (20) of the teeth (16, 17) in each bite (5, 6) extending from the highest point of each tooth 25. the extension to the lower flank (18, 19) at an oblique angle to the side of the tooth root.