| 摘要 |
1,161,811. Shearing. C. P. CLARE & CO. 25 Nov., 1966 [17 Jan., 1966], No. 52967/66. Heading B3W. [Also in Divisions C1 and H1] In a turret machine (see Division H1) for making pressurized sealed magnetic contact units one of the work stations comprises a feeding assembly 180 (Fig. 4) which advances a continuous length of tubing 62a intermittently to a cutting assembly 184 (Fig. 12) which shears discrete lengths of tubing 62 and transfers them to the tube-holding assemblies 76 carried by the turret. The feeding assembly includes a slide 232 which can reciprocate vertically under the control of an hydraulic cylinder 182 and carries a plate 244 (Fig. 9) formed with a groove 250 to receive the tube 62a. The tube is clamped in the groove by a pawl 252 pivoted to the plate 244 at 254 and loaded by a spring 256, so that when the slide moves upwards the continuous length of tube 62a is advanced through the fixed cutting die 226 of the cutting assembly 184 until the required length projects above the die. The cutting assembly also includes a slide 202 which reciprocates horizontally under the control of a hydraulic piston 198 and carries the movable cutting die 214 and a tube supporting plate 220 upward movement of the slide 232 described above advancing the length of tube 62a through an aperture 214a in the die 214 and into a groove 220a in the plate 220. The slide 202 is held in its retracted position (Fig. 4) by a stop pin 228 which projects with slight clearance into an opening 230 in the slide so that when the piston 198 is advanced the slide moves forward a distance sufficient to clamp the projecting portion 62 of the tube but insufficient to sever it. The tube feeding slide 232 then moves downwards, the tube 62a slipping between the plate 244 and the pawl 252, and at the end of its stroke a projecting arm 270a engages the enlarged end 268 of the stop pin 228 and withdraws the pin from the opening 230. The cutting slide 202 can then move forwards causing the tube portion 62 to be severed and advances to the position of Fig. 12 ready for the tube holding assembly 76, which is lowered to pick up the tube 62 and then proceeds to the next station where the tube is inserted into the switch housing. |
