B - Operations – Transporting – 26 – D
Patent
B - Operations, Transporting
26
D
164/136
B26D 5/00 (2006.01) B26D 5/12 (2006.01) B26D 7/00 (2006.01) B26D 7/18 (2006.01) B26F 1/02 (2006.01)
Patent
CA 1136983
ABSTRACT OF THE DISCLOSURE A pneumatic punch for paper, and particularly photographic paper. The punch comprises a cylinder having a piston seated within, to be pneumatically driven between upper and lower limits in the cylinder chamber. For this purpose, actuation and retraction air inlet ports are provided through the wall of the cylinder, the ports being separated by the piston against fluid communication within the cylinder chamber between the ports. An elongated guide of constant, circular cross-section is secured centrally to the piston on the side thereof exposed to the air from the retraction air inlet port. An elongated punch of circular cross-section is concentrically secured to the free end of the guide. A central relatively restricted air passageway extends from the actuation air inlet port side of the piston, passing through the piston, guide and punch. A die co- operates with the punch, the die having a body rigidly associated with the cylinder and having a slot of circular cross-section to re- ceive the punch. A space is provided between the punch, when the piston is at its upper limit, and the entrance to the slot of the die to receive and permit passage of paper to be punched. During opera- tion, air pressure from the actuation air inlet port drives the pis- ton to its lower limit as air is passed through the central air pas- sageway of the piston, guide and punch to force a slug of punched paper on through the slot. Such a punch avoids the need for sole- noids, often found in prior art punches used for photographic paper and permits smooth operation, ready adjustment and combined pneumatic punching and removal of slugs of paper produced by the punching process.
399256
Garrocho Jose M.
Ridout & Maybee Llp
LandOfFree
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