DE1561735A1 - Cutting device for paper webs - Google Patents

Description

SIEMENS AKTIENGESELLSCHAFT

8 Munich 2, 21st MA1196 9 Wittelsbacherplatz 2 Re / Pe

PA 67/2861

Cutting device for paper webs

The invention relates to a cutting device for thin cut material, especially for paper webs, consisting of two knives that move relative to each other and thereby a punctiform interface which is formed by the cutting edges and can be changed along the cutting line

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form.

When cutting, it is advantageous if there is a Point-shaped interface along the intended cutting line changed, as the cutting forces are very low compared to this the cutting force can be maintained, which is necessary to carry out a cutting process over a certain width at the same time to execute. Furthermore, it is advantageous that the cutting edges are at a narrow angle to one another in the region of the interface cross, as this enables a clean cut edge to be achieved and the risk of thinning is reduced Cut material is jammed between the cutting edges, making a cutting process impossible. Especially with automatic Cutting devices it is necessary that optimal conditions exist for the cutting process. A malfunction in the cutting device, which, for example, has to cut the paper length in automatic train information devices, would for example to a prolonged failure of the entire train information machine lead, since such machines are not constantly monitored by specialist staff.

To create a cutting device with very holier puncture security with very low maintenance requirements is " Object of the present invention. In addition, it is desirable that the cutting edges are straight, thus regrinding the cutting edges in a simple way

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is possible without special aids.

A cutting device for thin clippings that meets these requirements is fully sufficient, is characterized according to the invention in that the cutting edges are straight and - viewed in the direction of their relative movement, are arranged so as to cross one another, one of which is laterally immovable The cutting edge is arranged in the cutting direction and the other cutting edge is parallel to the cutting edge perpendicular to the cutting movement is displaceably mounted.

A preferred embodiment of the cutting device according to the invention is characterized in that one cutting edge is only movably mounted in the cutting direction and that the Gegenensch.ieidkante arranged obliquely to the cutting line and perpendicular to the cutting direction elastically parallel adjustable is.

Such built-up cutting devices provide the guarantee for trouble-free and cleanly executed cutting processes. They are particularly suitable for automatic operation, since their structure and mode of operation are so reliable that constant monitoring and maintenance can be dispensed with only becomes necessary at longer intervals.

For mechanical drive of the cutting device according to the invention

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direction it is advantageous according to a preferred formation, that the cutting edge executing the cutting movement is mounted pivotably on one side in the cutting direction and through a drive arranged on the other side is driven.

A particularly simple and secure storage of the counter-cutting edge results from another preferred pus formation the cutting device according to the invention, which is characterized is that the slidable perpendicular to the cutting direction mounted cutting edge is pivotable in parallel against the force of springs about a fixed axis.

Details of the invention emerge from the following on the basis of an exemplary embodiment shown in the drawing

the description.

It shows:

FIG. 1 shows the cutting device in a front view, FIG. 2 shows the cutting device in a plan view, and FIG Figure 3 shows the cutting device in side view.

Two bearing blocks 2, 3 are fastened on a base plate 1, which is shown broken away in FIGS. 2 and 3. In these The brackets 4, 5 for the cutting edges 6, 7 are mounted on bearing blocks 2, 3. The holder 5 for the cutting edge 7 is mounted pivotably on one side on the bearing block 2 in this way

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and out in the bearing block 3 in a longitudinal guide that the Cutting edge 7 perpendicular to the feed direction of the paper 8 to be trimmed can perform a cutting movement. This cutting movement is carried out by means of an electromagnet 9, which is also arranged on the base plate 1 and when energized, the force required to cut and to overcome the force of a retaining spring 10 via a plunger 11 and a coupling joint 12 on the holding device 5 for the cutting edge 7 gives off.

The holder 4 for the cutting edge 6 is between the two Bearing blocks 2, 3 mounted on bearing bolts 13, 14 in such a way that the cutting edge 6 with respect to the cutting plane of the cutting edge 7 is arranged obliquely around a -WinkeIcC and opposite the force of springs 15 »16 during the cutting process is pivotable so that the cutting edges 6, 7 run along the cutting line during the cutting process Form intersection.

In the bearing block 3, a resilient stop 17 is arranged, on which the holder 5 for the cutting edge 7 in its rest position is present.

4 claims
3 figures

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Claims (4)

Patent claims 1. Cutting device for thin clippings, especially for Paper webs consisting of two knives that have a relative movement execute to each other and thereby one formed by the cutting edges, variable along the cutting line point-to-point interface, characterized in that that the cutting edges (6, 7) are straight and - viewed in the direction of their relative movement to one another are arranged crossing, one laterally immovable Cutting edge is arranged in the cutting direction and the other cutting edge perpendicular to the cutting movement is mounted displaceably in parallel. 2. Cutting device according to claim 1, characterized in that the one cutting edge (7) only in the cutting direction is movably mounted and that the counter-cutting edge (6) is arranged obliquely to the cutting line and perpendicular to the cutting direction is elastically adjustable in parallel. 3. Cutting device according to one of "Claims 1 or 2, characterized characterized in that the cutting edge (7) executing the cutting movement can be pivoted on one side in the cutting direction is mounted and is driven by a drive (9, 10) arranged on the other side. BAD ORIGINAL 0098U / 0261 - 7 - _ ^ ! 'sue documents in. ? § ι «* ^{2 Nr} - ^{1 ScU 3 Jc5 M} - ^er ~ ^: '* ^Sjts * PA 9/415, '47O - 7 - 4. Cutting device according to one of the claims "! To 3, characterized characterized in that the cutting edge (6) mounted so as to be displaceable perpendicular to the cutting direction against the force of springs (15-16) and a fixed axis (13, 14) can be moved in parallel. 0098U / 0261