DE3228807A1 - Motor-operated nibbling shears - Google Patents

Abstract

The invention relates to one-hand motor-operated nibbling shears for steel sheet and other materials (see drawing, Fig. 2). Commercially available electric sheet-metal nibblers are constructed in such a way that the cutting force is directly transmitted to the blade by the motor shaft. This results in blade fracture in the event of overload. The commercially available blade is usually not adjustable. Known electric nibblers can only be used for certain workpiece thicknesses and only cut incompletely over sharp sheet-metal edges. According to the invention, the one-hand motor-operated nibbling shears do not have the usual commercial disadvantages (see drawing, Fig. 2). The adjustable drive spring (6) is tightened by cam (5) and roller (4). Only the relaxing drive spring (6) produces the cutting force for the blade (2). In the event of overload, it will not relax, and blade fracture is impossible. The eccentric blade bearing (3) has an adjusting lever (10) which can also lock in place in the counterbores (11 and 12). The blade opening can thereby be set to be larger or smaller and the cutting point can be shifted forwards or backwards. The adjustability and the fracture resistance of the blade (2) make the one-hand motor-operated nibbling shears suitable not only for sheet metal but also for wood, plastic and other craft sectors. They are intended to contribute to rationalisation in the entire craft sector. <IMAGE>

Description

Motor nibbling scissors

The invention relates to a one-handed motorized nibbling scissors for sheet steel and other materials.

So far known so-called ELektro. -Blechnibbers are built in such a way that the motor power is transmitted directly to the knife via cams and rollers.

See also Fig. 3. The sock 5, via the roller 4, generates the Cutting movement for knife 2, then spring 9 pushes knife 2 back in In the event of overload, e.g. material that is too firm, sheet metal that is too thick, invisible reinforcements on sheet metal housings, etc.

usually lead to knife breakage because the driving force is rigid on the knife The knife 2 is mounted centrally around the bearing pin 8 and cannot be adjusted known sheet metal nibblers are'weiL the travel of the knife 2 cannot be adjusted can, can only be used for bestimxtQ material thicknesses.

The invention is based on the problem of breaking the very expensive To prevent knives and the associated loss of working hours and repair work Another feature, the adjustable eccentric bearing pin, can be used the opening width of the knife can be adjusted.

This makes the same motor nibbling scissors for thicker materials and can therefore also be used for other craft areas. The invention is intended to rationalize The production costs are at the usual level.

The invention will then be described in more detail with the aid of functional drawings explained. They show: FIG. 1 the cutting head of a motorized nibbling scissors Invention = according to the motor shaft 7, with cams 5, via the roller 4, the adjustable Drive spring 6 tensions. Then the relaxing drive spring 6 generates the Damage force for knife 2. If knife 2 is overloaded, the drive spring will 6, stay taut, the roller 4 remain in the upper position and the cam 5 run empty. Knife breakage due to overload or jamming is therefore impossible.

Fio. 2 the cutting head of the motor nibbling scissors according to FIG. 1, in which According to the invention, on the outside of the adjusting lever 10, on the eccentric bearing pin 3, is firmly attached ~ By turning the adjustment lever 10, which also goes into the countersinks 11 and 12 can engage, the eccentric bearing pin 3 is rotated and thereby the knife opening and position are misaligned 0 If the setting lever 10 (Fig. 2) is locked in at the front the knife opening is small, the point of intersection is more in front and it can be better over sharp outer edges, e.g. Sheet metal angles to be cut. When engaging in countersink if knife 2 is moved downwards and towards cam 5, the point of intersection is more to the rear0 Be in the recess 12, the knife 2 is still further down offset so that the point of intersection is moved further back and the knife opening significantly enlarged.

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Claims (4)

Claims motor nibbling scissors, especially those fir sheets and other materials, characterized in that the cutting force for the knife 2, is achieved by the spring force of the drive spring 62. 2. Motor nibbling scissors according to claim 1, characterized in that the knife 2 is mounted eccentrically. 30 motor nibbling scissors according to claim 1 and 2, characterized that an adjustment lever 70 is attached with which the eccentric bearing 3 is adjusted can be. 4. Motor nibbling scissors according to claim 1 - 5, characterized that the opening width of the knife 2, change by a #adjusting device leaves.