Cutting – Means to drive or to guide tool – With simple rectilinear reciprocating motion only
Patent
1978-01-16
1979-11-06
Schran, Donald R.
Cutting
Means to drive or to guide tool
With simple rectilinear reciprocating motion only
83630, 83639, 91394, B26D 512, B27L 508
Patent
active
041731620
ABSTRACT:
A machine for clipping strip material including a blade operated in a cyclic manner having a cutting stroke and a return stroke. A toggle linkage including a toggle bar effecting one blade cycle by moving in a lengthwise direction with the blade being reciprocated by toggle linkages moving through an upright position to a position oppositely inclined to their starting position. The toggle bar is coupled to an actuating piston rod of a pneumatic cylinder. End caps of the cylinder are recessed to receive piston extensions during final stages of piston travel for cushioning purposes. Seal means engage each piston extension during the later stage of piston travel to trap air between the advancing piston and the end cap. Accordingly, blade and toggle assembly inertia is dissipated in the compression of trapped cylinder air. Exhaust means within each of said end caps is valve controlled to release cylinder pressure at a desired pressure braking the latter stages of piston travel. A modified form of cylinder includes modified exhaust poppet valves each subject to a valve regulated, poppet closing pressure as in the first form of cylinder and additionally having a surface area thereon against which a secondary source of air may act to hold the poppet closed against extremely high piston actuating pressures. The modified cylinder further includes end caps each having a port served by an end cap mounted valve to admit a piston actuating charge and a remaining port admitting a secondary flow into the cylinder and controlled by an end cap mounted valve.
REFERENCES:
patent: 3691902 (1972-09-01), Lebzelter
patent: 3837250 (1974-09-01), Lumn
patent: 3889576 (1975-06-01), Sheffer et al.
patent: 3894460 (1975-07-01), Lumn
patent: 4130041 (1978-12-01), McGee
Givnan, Jr. James D.
Schran Donald R.
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