Patent GB-695674-A (GB)
Title: Improvements in or relating to presses, stamping machines, or similar working machines
IPC: B21D43/28
Filed: 1951-08-17
Abstract: 695,674. Shearing; stamping. SCHULER, AKT.-GES., L. Aug. 17, 1951 [May 16, 1951], No. 19434/51. Class 83 (iv). In a stamping &c. machine a mechanical photo-electric or other scanning device for the end of the strip operates a cutter for severing the strip after the last complete punching length has been fed independently of the number of strokes of the ram. A cutting ram is coupled to the stamping &c. ram by a spring- urged coupling bolt slidable in the cutting ram to be actuated thereby. The upper feed roll 13 is supported in levers 18, 19 pivoted on pins 16 and actuated by a punching ram 24. A cutting ram 46 carrying a blade 51 is coupled to the stamping &c. ram 24 by a bolt 45 engaging a recess 47 on the ram. For inserting a new strip the feed roll 13 is raised by a hand lever, Fig. 3 (not shown). This rocks levers 33, 35 clockwise and levers 55, 67, 76 anticlockwise to bring the parts into the position shown in Fig. 4, with a stop 37 in the feed path and the feeler 52 out of the path. A locking member 28 is moved to hold the bearing blocks 14, 15 of the feed rolls. A now strip is inserted against the stop 37 and the hand lever is rocked to depress lever 29 to engage a finger 30 on the lever 18. During the downward movement of the ram 24 the lever 18 is rocked clockwise and a lever 32 anticlockwise. At the lower deadcentre the blocks 14, 15 are unlocked and the roll 13 descends and the stop 37 is lifted and the feeler 52 is raised. When the lever 32 rocks a catch 38 is lifted and a spring 43 rocks levers 40, 41, 42 clockwise to engage the coupling bolt 45 with the ram 24. During the raising of the ram a projection 75 through a leg 49 rocks the lever 18 clockwise while the rod 29 moves to the left and leg 49 engages the projection 75. The hand lever is moved to a lower position and lever 29 is raised clear of the nose 30. During the next half-revolution of the driving-crank the strip is fed and the end comes under the cutter 51. The bolt 45 is pushed into the recess 47 and the lever 40, 41, 42 rocked clockwise. During the following stroke of the ram 24 the cutting ram 46 is operated to sever the front end of the strip. As the ram 46 descends the leg 49 is rocked over projection 75 and catch 38 engages arm 40. As the ram 24 and the cutting ram 46 rise the leg 49 is raised to rock lever 40 and withdraw coupling bolt 45 and the parts are locked as shown in Fig. 5 and remain so during the punching of the strip. When at the end of the strip a punching length and a fraction are left the feeler 52 is moved by a spring 65 into raised position and lever 55 is rocked to engage arm 67 with lever 66 and a shaft 57 is rotated. On the upstroke of the ram 24 a rod 60 is moved to the left and the shaft 31 is rotated counter. clockwise. The catch 38 is moved to allow coupling bolt 45 to bear against a member 48 carrying the recess 47. During the last feedstep the ram is coupled in the upper dead-centre position of the ram 24. When the two rams move downwards the cutter severs the fractional length from the strip. On the raising of the ram 24 the cutting ram 46 is uncoupled and catch 38 relocks the ports. The feed device is released by the raising of the hand lever.