GB738202A - Improvements in pressing, stamping, drawing, shearing or the like machines - Google Patents

Abstract

738,202. Stamping; shearing. FEINPRUEF FEINMESSUND PRUEFGERAETE GES. April 7, 1953 [April 4, 1952], No. 9295/53. Classes 83 (3) and 83 (4). Machine-tool details.-A workpiece feed unit for stamping and shearing machines has a work holder displaceable from a feed position to a work position and vice versa and is attachable to and detachable from the machine, the driving and control members for the work holder being included therein. The unit 3 is attached to the work-table of the machine and the workpiece 5 is located in an apertme in a holder 17 and supported on a cover-slide 18 beneath the holder. The holder and cover-slide are reciprocated by a rack and pinion 12 operating a pair of cranks 13 engaging the holder-slide 15, said rack being reciprocated by a solenoid 10 controlled by a pedal 7. The holder is mounted in a vertically-adjustable carrier 16. The pedal 7 also operates the switch controlling the machine, but safety means prevent operation of the tool until the holder has positioned the blank in the machine. The safety means consist of a sliding catch-plate 23, a rod 24 having an adjustable stop 25 and a switchactuating rod 21. On forward movement of the holder 17 the rod 24 follows until the stop 25 abuts the catch-plate 23, which is moved until a hole therein aligns with a head 22 on the rod 21 when the work is positioned, so that the rod, which is attached to the pedal 7, is depressed and actuates the switch 11 by a collar 27. When the lever is released the head 22 moves clear of the hole in the catch-plate and a spring 28 returns the catch-plate to its initial position which prevents downward movement of the rod. During the feeding stroke of the holder the cover slide is arrested by the lower die 2 of the machine whilst the holder continues to the end of its stroke, whereupon a spring-loaded pawl 19 moves upwards and locks the holder and slide in position. On the return movement of the holder and slide the blank 5 falls through the aperture, Fig. 7, and is discharged from the machine. The pawl works automatically but may also be hand operated at 20. When the holder has returned to its initial position the pawl is released and the cover-slide closes the aperture in the holder ready to receive the next blank. The work holder may be constructed as a die and may be operated hydraulically or pneumatically.