Patent GB-116969-A (GB)
Title: Machine for Cutting Blanks.
Inventor: DEHN FRANK BERNHARD
IPC: C14B5/00
Filed: 1917-08-20
Abstract: 116,969. Dehn, F. B., (Alsop Process Co.). Aug. 20, 1917. Heels, machines for. -In apparatus for cutting heel-blanks, such as pierced heel lifts, and for building separate heel blanks or continuous logs in a continuous operation, scraps of leather are straight-edged by means of cutters 7, 81, the scraps: are assembled to form s three-piece lift on the top of the die 69, the cutting-block 46 is then depressed and the lift cut and forced into the die, the excess of leather falling off. The lifts are accumulated within a holder, formed by a breast plate 71 and a back plate 72, Fig. 6, which holder may extend unobstructed through an opening in the floor under the machine, so that the logs may be built up to any desired length to be subsequently cut up by a suitable machine into heel-blank sizes. The cutter 77 is stationary and the cutter 81 is mounted in a cross-head which is reciprocated from a shaft 5 driven through the medium of a one-revolution clutch put into operation by a treadle 16, the actuating means comprising crankwheels 19 secured to the shaft 5, connecting rods 25, Fig. 2, levers 23 pivoted at 21, and connecting-rods 31. A plunger 41 carrying the cutting- block 46 is maintained in its upper position by rods 38 pulled upwards by springs 76 secured at one end to supports 34 on which the table 35 is mounted, and is pulled down by depressing a foot bar 39. By using a separate treadle for the cutters 81, and so operating them independently when straight-edging the scraps, accidents are prevented. The mechanism by which the cutting- block is operated is so arranged that it is only depressed once for every depression of the foot bar, although the cross-head 29 continues its reciprocation so long as the shaft 5 is rotating. The plunger 41 is provided with arms 45, 47, Fig. 6, at its ends, connected by a rod 49 carrying a clip 58 in which is pivoted a double dog 59, the upper hook 60 of which engages a tongue 54 on a part 53 mounted on a cross pin slidable in a slot in the upper end of the plunger and pressed upwards by a spring-actuated lift pin 65. The part 53 carries hooks 52. The depression of the foot bar 39 causes the lower hook 61 of the dog 59 to be engaged and pressed upwards by a latch 57 on a bracket 56 carried bv the cross-head 29 so that the tongue 54 is released. A spring 64 raises the tongue, and the part 53 turns on its pin 50; the hooks 52 turn inwards and engage the bottom of the cross-head 29. At the same time a projection on the foot bar 39 engages and depresses the treadle 16, puts into gear the clutch on the shaft 5, and pulls down the cross head 29 and the hooks 52. The pin 50 depresses the lift pin 65, and through the spring 67 and plunger 41 pulls down the cutting block. In the meantime, the arm 54 will be drawn below the hook 60, which will immediately snap over the end of it. The cross-head then rises out of engagement with the hooks 52, and the spring 67 forces the pin 50 upwards, withdrawing the hooks from beneath the cross-head into position for the next cutting operation. The lowering of the plunger to bring the hooks 52 into engagement with the cross-head being effected by the treadle, an object thicker than a lift, such as the operator's finger, on the die 69, tends to prevent the hooks from being lowered sufficiently, and serious injury would thus be avoided. To determine the thickness of the lift cut, and to enable the heel blanks to be built of uniform height, the lifts in the holder are arranged to depress a lever 93 and raise a pointer 96 on a. scale 97. A paste-pot 85 having a mouth-piece 87 is provided. The clutch mechanism by which the shaft 5 is driven comprises a freely mounted belt-driven pulley 6, Fig. 4, carrying a clutch-tooth 7 co-operating with a tooth 9 on a clutch-member 8 which is splined on the shaft and pressed towards the pulley 6 by a spring pin 17 but held out of engagement therewith by the treadle 16, the end 15 of which has an inclined face engaging with a cam surface 10.