Cutting – Operation of member controlled by means responsive to... – With means to initiate operation of member
Patent
1975-05-07
1976-06-22
Yost, Frank T.
Cutting
Operation of member controlled by means responsive to...
With means to initiate operation of member
83564, 83628, 83698, 83701, B26D 726
Patent
active
039643581
ABSTRACT:
A punching apparatus includes a press frame having upper and lower portions forming a recess to receive a workpiece that is supported by a worktable mounted on the frame lower portion. A tool support arm having a tool holder releasably connected thereto is pivotally connected to the frame upper portion for movement into and out of vertical alignment with a ram punch and die. A fluid actuated piston cylinder assembly is connected to the press frame in the recess with an extensible rod of the assembly connected to the rear end portion of the tool support arm. Actuation of the assembly by an actuator valve laterally swings the tool support arm between a tool punching position and a tool changing position displaced from alignment with the ram punch and die. A fluid actuated extensible device in the frame upper portion secures the tool support arm to the press frame in the tool punching position. Operation of the actuator valve is coordinated with the extensible device by a control valve that is responsive to a pilot valve to pivot the tool support arm to the punching position and release the tool suppot arm from engagement to the press frame. A time delay device permits release of the tool support arm before the piston cylinder assembly is actuated to pivot the tool support arm. The control valve is actuated by the pilot valve to redirect flow to the extensible device and release the tool support arm from engagement to the press frame during the delay interval.
REFERENCES:
patent: 3270605 (1966-09-01), Schott et al.
patent: 3405581 (1968-10-01), Krynytzky
patent: 3765291 (1973-10-01), Steufeldt
Galland Robert J.
Stefano Rocco L.
Adams John M.
Price, Jr,. Stanley J.
Unipunch Products, Inc.
Yost Frank T.
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