| 摘要 |
<p>1497320 Punching apparatus SHELDAHL Inc 17 Dec 1975 [18 Feb 1975] 51735/75 Heading B4B An apparatus for perforating flexible sheet material used, e.g. in bag making comprises a punch mechanism 11 mounted in a frame 12 and including a pneumatic piston-and-cylinder device 20, 22 for actuating a punch 23 which co-operates with a die assembly 16, a compressed air means for ejecting a punched-out slug from the punch mechanism and means for controlling the flow of air to the cylinders and ejecting means. The punch mechanism 11 includes a clamping plate 51 arranged to co-operate with a surface 53 on the die assembly 16, so as to stretch the material over a flange 67 surrounding the die opening. A skirt member 43 is secured to the die and a bag for collection of the slugs is held on the skirt by a spring clip 44, Fig. 2. A second punch mechanism 10 is provided and both punch mechanisms are slidably mounted on guide-ways 13. The control means includes valves 76, 78 actuated by solenoids 77, 79 which are controlled by cam-actuated switches (98, 101) Fig. 4 (not shown).</p> |
