Cutting – With product handling means – By fluid current
Patent
1981-04-02
1983-12-06
Meister, James M.
Cutting
With product handling means
By fluid current
83639, B26F 114
Patent
active
044185960
ABSTRACT:
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 cooperates with the punch, the die having a body rigidly associated with the cylinder and having a slot of circular cross-section to receive 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 operation, air pressure from the actuation air inlet port drives the piston to its lower limit as air is passed through the central air passageway of the piston, guide and punch to force a slug of punched paper on through the slot. Such a punch avoids the need for solenoids, 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.
REFERENCES:
patent: 2287168 (1942-06-01), Duncan
patent: 3196728 (1965-07-01), Snow
patent: 3232527 (1966-02-01), Hiser
patent: 3524368 (1970-08-01), Goldman
patent: 3722337 (1973-03-01), Brolund et al.
patent: 3939743 (1976-02-01), Coombes
patent: 4096727 (1978-06-01), Gargaillo
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