Patent GB-634532-A (GB)
Title: Improvements in or relating to apparatus for cutting, punching or pressing moving metal or other strip or profiled strip material
IPC: B21D43/02
Filed: 1947-08-22
Abstract: 634,532. Cutting-machines. METAL TRIM, Ltd., and PENKALA, E. Aug. 22, 1947, No. 23333. [Class 31 (i)] [Also in Group XXII] A cutting, punching, &c. machine for continuously-fed strip material comprises a die carrier intermittently reciprocable along the feed path under control of a lengthgauging stop, and toggle mechanism to reciprocate die-operating means during the carrier forward stroke and to hold the means inoperative during the carrier return stroke. A machine, Fig. 16, co-operating with a profile strip mill C is mounted on a vertically-adjustable bed 27 and comprises stop and ejector unit D connected by control rods 15a to a self-contained die unit A and belt-driven operating mechanism B. Framings and tables.-The carrier, Fig. 10, comprises a horizontally reciprocable frame 1 mounted on guide rollers 1e of a bed 2 and supports a die table 3 vertically adjustable by screws 3b. A die-operating abutment 8 is screw-adjustable in an upper cross-head 5, screw-adjustably carried on sprung rods 4 slidable vertically in frame tubes 1a. Rotation of cross-head nuts 5a of sleeves 5b simultaneously operates the screws 3b to position the crosshead 5 and table 3 vertically. A lower cross-head 6 secured to the rods 4 carries a sprung crank mechanism, Fig. 4, not shown, and a control rod 6g engaging frame-supported buffers 19a, 2e operating dogs 6c for a togglelink support 6a. Operating mechanism.-The frame 1 is reciprocated by links, Fig. 2, not shown, connected to a crankshaft 9 and a toggle linkage 18, 18b secured to the frame 1 and a bed member 19 that reciprocates the cross-heads 5, 6 during the carrier forward stroke. The dogs 6c release the support 6a and free the toggle during the carrier return stroke. Stop mechanism.-The crankshaft 9 is driven through gears 12a, 12b from a main shaft 12c by a one-revolution clutch comprising a bush 12 secured to the gear 12a and co-operating with a key 13 normally held inoperative by sprung latch mechanism, Fig. 6, not shown, and a cam follower 16a engaging an adjustable plate 15e of the die unit A slidably spring-mounted on the table 3. A brake is released by a cam-plate 1 j on the frame 1 to stop the crank-shaft 9 when it is declutched. Gauging stops.-A flag 23a, Fig. 13, is spring- toggled in a carriage 26c roller-mounted on the unit D and clamped to the rods 15a at the required gauge length. The flag 23a carries a roll 23d, work-guides 23f and a follower 23c engaging a cam-slot 26d in the carriage side. Work ejector.-When the carriage 26c is moved forward by the rods 15a the slot 26d deflects the flag 23a horizontally for the work to pass thereover on the roll 23d. When the carriage 26c reverses, the slot 26d raises the flag 23a and the roll 23d tilts the work into engagement with a control roll 26e and it runs clear of the unit D. Operation. When the strip &c. contacts the flag 23a the carriage 26c and rods 15a move the die assembly A with the strip and the plate 15e releases the follower 16a and clutches the shaft 9 to the drive 12c to power drive the frame 1 forward at the speed of the moving strip. The toggles 18, 18b first straighten and depress the head 5 to operate the dies and then collapse to raise the dies clear of the strip. The rod 6g strikes the buffer 19a and releases the dogs 6c so that on the carrier reverse stroke the toggle is free and the dies are inoperative. When the rod 6g strikes the buffer 2e the toggle is re-set and the drive is declutched by the latch mechanism and the cam plate 1j releases the brake to stop the shaft 9. In a modification, the carrier is fluid-pressure reciprocated and the toggle release gear may be carried on the upper cross-head. A die assembly for use in the machine is described in Specification 688,230, [Group XXII].