Patent GB-752477-A (GB)
Title: Improvements in apparatus for perforating spinneret caps
IPC: B21D31/02
Filed: 1954-03-19
Abstract: 752,477. Making nozzles. TEXTILE & CHEMICAL RESEARCH CO., Ltd. March 19, 1954 [April 8, 1953], No. 8158/54. Classes 83 (2) and 83 (4). [Also in Group XXX] In an automatic machine for dimpling spinneret caps in which a punch is gravity-operated and a holder for the cap is rotated step-by-step the rotation of the holder and the lifting of the punch are performed by electric motors the control circuits of which are completed through perforations in a travelling belt which thus controls the sequence of operations. The machine punches two circles of indentations in the base of the cap which is of platinum or platinum alloy. Assuming an unpunched cap 19 is in position on the sheet of aluminium 21 in the holder 18, closure of the main switch starts a motor 99 which disengages a cam 91 from an arm 87 to allow the slider 75 carrying the punch 78 to fall freely with a force which can be varied by altering the weights 81 in a canister 80 secured to the slider 75. The punch 78 is raised by re-engagement of the cam 91 with the arm 87 which rotates a pinion 83 engaging a rack 82 on the slider 75 whereupon a projection 102 on the slider 75 operates a switch 103 to stop and start the motors 99, 35 respectively. The motor 35 through gearing rotates the holder 18 and a drum 42 which drives a continuous belt 47 supported on rollers 48, 49 mounted on the base 1. Four rows of perforations 56 ... 59 in the belt co-operate with feelers 60 ... 63 which when in engagement with the drum 42 close the various control circuits of the motors. When the feeler 61 engages the drum 42 through a perforation 57, the motor 35 is stopped and the motor 99 started so that the next indentation is' punched. The cycle of operations is repeated until a complete circle of indentations has been punched, whereupon the feeler 60 engages the drum 42 through a perforation 56 in the belt 47 and causes a motor 12 to rotate a cam 8 which moves the work-table 4 carrying the holder 18 about a pivot 5 to bring the spinneret cap 19 into the position required for punching an inner circle of indentations. The inner circle is punched under the control of the belt 47 in a similar manner to the outer. On completion of the punching, the feelers 62, 63 engage the drum 42 through perforations 58, 69, in the belt 47 to start motors 147, 137 respectively. The motor 147 through a cam 145 drives the pinion 83 to lift the slider 75 until the punch 78 is clear of the spinneret cap. Feeding and ejecting spinneret caps.-The motor 137 rotates and by means of a cam 124 raises and lowers a shaft 113 carrying radial arms 112, 176. A fixed jaw 115 and a spring- loaded pivoted jaw 116 on the end of the arm 112 engage under the flange of the cap 19, lift it out of the holder 18 and drop it into a hopper 155 when the pivoted jaw 116 engages a stop 154. The motor 137 also rotates a disc 168 having an aperture normally positioned under one of the magazines 160 ... 162 and now containing an unpunched cap which just before a complete rotation of the disc 168 is finished drops down a shoot 173 and is pressed firmly into the holder 18 by the arm 176. The disc 168 is returned to its normal position under a magazine and, should the latter be empty and no cap fall into the aperture in the disc 168, a photo-electric device 184, 185 causes a motor 182 to rotate the spider 163 carrying the magazines 160 ... 162 until a cap falls into the aperture in the disc 168. In a modification, the cap is pulled into the holder electromagnetically. Stop mechanism.-Each time that the punch 78 contacts the cap 19 in the holder 18 a circuit is completed to energize a solenoid 204 which deflects contact 198 away from contact 197. Should the tip of the punch 78 be broken, a projection on a disc 195 rotating with the pinion 83 closes contacts 197, 198 before the solenoid 204 is energized and stops the machine. Perforating.-The round-headed punch 78, Fig. 10, makes semispherical indentations 108 in the base 20 of the cap. The projections thus formed are removed by abrasive polishing to leave sharp-edged holes. Specification 699,280 is referred to.