Patent GB-860984-A (GB)
Title: Improvements in shoe end lasting machines
IPC: A43D21/12
Filed: 1957-02-27
Abstract: 860,984. Lasting and trimming machines. KAMBORIAN, J. S. Feb. 27, 1957 [March 26, 1956; Dec. 24, 1956], No. 6530/57. Class 17(1) A shoe end lasting machine has a trimmer for trimming the inwardly folded lasting margin, power actuated means for advancing the trimmer, and means controlling the power means to bring the trimmer to a predetermined optimum position adjacent the work prior to operation thereof. The upper is trimmed after being tensioned, wiped, and secured by adhesive. The shoe support 44, 46, the wipers 22 (not shown) 24, and the trimmer 30 are operated by respective motors, preferably pneumatic cylinders. Cylinder and piston 56 reciprocates a slide 14 which acts through wiper actuators 18 (not shown), 20 to actuate the wipers. Trimmer 30 guided beneath the wipers by the wiper support and operated by a double acting cylinder 86, has two cutting edges 34 at about 90 degrees to each other and bevelled on the upper side, with the crotch 36 filleted and the edges 38 rounded. Cylinder and piston 58 causes rod 50 with toe rest 46 to move vertically, and collar 54 imparts this movement to carriage 48 supporting heel rest 44. Cylinders 56, 58, 86 are controlled respectively by valves V1, V2, V3 (not shown), and each is associated with a respective pressure regulator. The positions of valves V1, V2 are controlled by handle 98 which is pushed and pulled to move the wipers rearwardly and forwardly, and rotated to raise and lower the shoe support. Valve V3 is actuated by solenoids S1, S2, Fig. 6, controlled by switch SW1 which is operated by means of spindle 100. Normally SW1 is closed at contact Cl so that solenoid S2 is energized in the circuit 160, 164, S2, 166, Cl, 168, 158 and holds V3 in such position that cylinder 86 retains trimmer 30 in retracted position. When spindle 100 is depressed, switch SW1 is broken at C1 and connected at C2, breaking the circuit through S2, and making the circuit through solenoid Sl, i.e. 160, 164, S1 170, normally closed switch SW2, 172, C2, 168, and 158, solenoid 53 being energized. Solenoid Sl actuates V3 so that cylinder 86 advances trimmer 30. A rod 184 with a button 192 and the switch SW2 are advanced with the trimmer until the button engages the shoe, whereupon movement of the rod is arrested but the trimmer and switch continue to advance until the end 186 of the rod is engaged by the trip 181 and the switch opened. Button 192 is adjustable lengthwise of rod 184, and this adjustment determines the amount the cutter will advance after the button has engaged the shoe. Opening of switch SW2 de-energizes solenoid S1, causing the trimmer to stop. The shoe is then raised by manipulation of handle 98 to press the shoe bottom against the underside of the trimmer, and trimming then effected by further depression of spindle 100 to close the normally open switch SW3 so that solenoid S1 is again energized in the circuit 160,164, Sl, 170. 196, SW3, 198, 158. Energization of solenoid S3 causes a normally open valve V4 (not shown) to close, whereupon fluid passes through another regulator at reduced pressure to valve V2, so that the upward pressure on the shoe is less during trimming than in lasting. Release of spindle 100 opens switch SW3 and restores switch SW1 so that the trimmer is retracted. Specification 855,599 is referred to.