DE569052C - Scissors with circular knives for trimming sheet metal and trimming shaped iron - Google Patents

Description

When trimming sheet metal and trimming angles and other shaped iron by shearing with circular knives, the removal and shredding of the waste strips presents great difficulties.

These strips are mostly because they take a sinuous shape, very bulky and, the longer they are, the more stubborn in eliminating them.

Unless special facilities are in place, they become time-consuming removed by workers by hand and with pliers and a special scrap shears for Comminution fed.

The idea now of shredding the waste strips at their point of origin a rotating pair of knife groups that move with one of the feed speed of the work piece corresponding peripheral speed

ao speed is driven, the knives of which are fed to them through a funnel-shaped guide, Cutting separated strips of waste into pieces has been around for a long time and has already been carried out in many ways.

To achieve a better and safer cutting effect, you also have the appropriate ones Advantages of a bevel cut brought into use by cutting the knife edges formed helically around the roller body serving as a knife carrier.

Common to all versions is the connected drive of the circular knives and the partial knife to set a certain dependency relationship to each other, whereby the exact correspondence of the feed speed when trimming or trimming is secured with the peripheral speed of the partial knife.

But now the secure gripping of the waste strip by tilting, which working with circular knives always causes, very difficult, and the greater the distance is between partial knives and circular knives, the greater the amount of tilt, and the wider the waste strips, the more unpleasant it becomes noticeable. The experience is quite unpleasant, Disturbances that can be traced back to it, and their most effective control in the smallest possible distance lies between the partial knife and cutting knife, and this is achieved by one of the circular partial knife carriers attached directly to one of the two circular knife axes, as the claim emphasizes.

Only then can you capture every waste strip for the cut with certainty up to full width of the partial knife, and if one takes into consideration that there is a partial knife axis in addition to bearing and drive wheel

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saves, then this much simplified, space-saving invention results in a considerable technical advance. Fig. I shows the two driven circular. knife «and b, which are used for trimming the sheet metal or for trimming shaped iron, in elevation and Fig. II the lower knife b in plan. Immediately behind the lower circular knife sits, wedged on the same axis ίο, a circular knife carrier c, in which four inclined knives are inserted. On the shaft d, which is driven by a pair of wheels with helical teeth of the lower knife shaft, a circular knife carrier e is keyed with two obliquely set blades, whose rotational speed to the rotational speed of the knife holder c their diameter to the number of blades in the inverse ratio of the number in the knife carrier c stands, ie. at

the half
4 _

Knife number - is
4th

the speed

= twice as big. With the same knife pitch, their circumferential speeds are same. So two knives always come together to cut. Under this condition other numbers of knives can also be permitted.

The sheet to be trimmed is fed to the circular knives in the direction of the arrow. Of the The waste strip is bent downwards by the upper circular knife and through the Guide piece screwed to the body of the scissors / the cutting point of the inserted Knife fed with safety. The inclination of the knives should be gradual Effect cutting, reduce the scissor pressure and cause calmer work.

Claims (1)

Claim: Scissors with circular knives for trimming sheet metal and trimming shaped iron etc., in which the waste strips are separated by special rotating knife carriers 45 arranged and an oblique cut generating knife are comminuted, thereby characterized in that one of the knife carriers is attached to the one circular knife axis. 1 sheet of drawings