DE19614652A1 - Cutting box for production of stapling heads from wire - Google Patents

Abstract

The cutting box has two knives (1,2), which are arranged so that their cutting edges (4,6) come against each other in a fork-like manner in the cutting position. The cutting edges are straight. One knife may be in the form of a moving running knife, while the other is a stationary counter-knife. Either knife or both knives may be removably mounted on a knife holder. At least one spreading spring may be used to spread the two knives out from each other.

Description

The invention relates to a cutting box according to the Preamble of claim 1.

Stapling machines for the mechanical stapling of brochures, Magazines etc. are usually with stitching heads provided, the wire staples during stapling form. The wire is taken from a supply roll deducted, cut to the required length, for Staple bent, pushed into the staple and to the Leg ends of the staple to complete the stapling bent over.

In such stitching heads, the wire is cut to length so-called cutting box attached, which is a circular knife and has a flat knife attached to it. The wire is carried out by the circular knife and with the on the Round knife sliding flat knife in one Cut shear motion.

The wire ends of the cut point show different profile. The shear causes the Wire bent, with indentations and Burrs arise.

This has the consequence that one with wire cut in this way formed staple deformities at the ends of the staples  having the straight penetration of the staple in make it difficult to staple, if not prevent. When pushing in The staple can move the legs sideways be distracted, which results in an undefined course of the Staple inside the stack of paper to be stapled. Correct stapling is no longer possible. Especially when stapling thick paper stacks with very The described disadvantages are exacerbated by thin wire on.

The invention therefore has the task of a cutting box for to provide a stitching head that enables the wire for to cut the staples so that good guidance of the Wire inside the staple remains guaranteed.

Starting from a cutting box, this is the preliminary mentioned type by the characteristic features of the Claim 1 solved.

The measures in the subclaims are advantageous Designs and developments of the invention possible.

Accordingly, a cutting box according to the invention two knives, which are arranged so that their Cutting edges in pliers-like position clash. This will create a shear motion avoided so that protruding burrs on the wire ends are not are more possible. The wire is held by both knives of cutting indented.

Cutting knives that are straight are preferably used here Have cutting edges. This will make the wire so cut that there is a flat tip, which also is centered on the wire cross-section. Such a cut wire clip experiences when penetrating into it Stitched goods do not deviate from the above  predetermined path and can thus be defined in the booklet be pushed in. The pointed interface also makes it easier penetration of the staple into the staple.

A knife is preferably used as a movable running knife and the other knife is designed as a stationary counter knife. On this way only one knife needs to be driven for cutting to become, which simplifies the control of the cutting box results.

In a preferred embodiment, the cutting knives attached to knife holders. Because the cutting knife Representing wearing parts is an exchange in certain Periods of time necessary. This is simplified in that the Drive of the cutting box guided over the knife holder is, and the cutting knife releasably on the knife holders be attached.

At least one spreading spring is preferred for Spread apart of the two knife holders provided, see above that the cutting box is driven by a single one Pressure movement for cutting the wire can be effected.

An embodiment of the invention is in the drawing shown and will be explained in more detail below with reference to the figures described.

Show in detail

Fig. 1 is a plan view of an inventive knife assembly

Fig. 2 is a side view of an arrangement according to FIG. 1,

Fig. 3 is a side view of the cut wire ends and

Fig. 4 is a side view of a finished staple.

In Fig. 1 a running knife 1 and a stationary counter knife 2 are attached to knife holders, not shown, for example screwed. The running knife 1 has a cut 3 , so that a cutting edge 4 results. The counter knife 2 is also provided with a cut 5 so that a cutting edge 6 is also present here. A wire 7 rests on the counter knife 2 or is guided past it in the immediate vicinity of the cutting edge 6 .

For cutting, the running knife 1 is guided downward in the direction of the arrow P, so that a pliers-like movement results, at the end of which the cutting edges 4 and 6 of the running knife 1 and the counter knife 2 lie one on top of the other. The wire 7 is pinched on both sides by both knives. There are no protruding ridges.

As shown in Fig. 3, the two wire ends 7 a, 7 b are pointed afterwards. The tips 8 a, b lie symmetrically to a wire center plane m. After the lengthened wire pieces have been bent, the two wire ends 7 a, b each form one leg end of different staples 9 formed in succession. Are as both wire ends 7 a b, a mirror image is formed, and the tip 8a of matches in shape at the other end of the wire with the tip 8 b previously or subsequently formed tip 8 a ', each staple 9 mirror image and at the same time with respect to the axis m the clamp leg 10 a, b symmetrical leg ends 8 b, 8 a 'on.

As a result, this wire tip is not deflected in the lateral direction when it is pressed into the material to be stapled, as a result of which a defined path of the staple 9 is provided and, in particular, correct stapling of large stacks of paper with comparatively thin wire is possible.

Reference list

1 running knife
2 counter knives
3 cuts
4 cutting edge
5 cuts
6 cutting edge
7 wire
8 wire ends
9 staples
10 staple legs

Claims (7)

1. Cutting box for a stitching head for cutting a wire to form a staple, two knives being provided, characterized in that the knives ( 1 , 2 ) are arranged in such a way that their cutting edges ( 4 , 6 ) meet like pliers in the cutting position. 2. Cutting box according to claim 1, characterized in that the cutting knives ( 1 , 2 ) have straight cutting edges ( 4 , 6 ). 3. Cutting box according to one of the preceding claims, characterized in that one knife is designed as a movable running knife ( 1 ), while the other knife is a stationary counter knife ( 2 ). 4. Cutting box according to claim 1, characterized in that the running knife ( 1 ) and / or the counter knife ( 2 ) are detachably mounted on a knife holder. 5. Cutting box according to one of the preceding claims, characterized in that at least one spreading spring for Spreading apart of the two knife holders is provided. 6. Stapling head for a stapling machine for stapling Brochures, magazines or the like, thereby characterized in that a cutting box according to claim 1 until 5 is present. 7. A method for stapling stacks of paper, in particular magazines, brochures, etc., wherein a staple is formed from wire, which is cut by a wire roll and bent into a staple, characterized in that the wire ( 7 ) when cutting through at least two abutting Knife ( 1 , 2 ) is pinched.