Pneumatic control system for a press
AssigneeTextron Inc.
InventorDonald R. Wright
Life of this patent
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Abstract
A pneumatic control system for a press which includes a pair of start switches. The system is constructed so that the press can only be started if both of the start switches are actuated within a predetermined time interval. If one of the start switches is released during a down stroke of the press, the press is stopped. A cam operated switch permits continued operation of the press after the press has reached its bottom position even though start switches are released after the press has passed full down position. A brake cam operated switch prevents operation of the press if the press fails to stop at its full up position.
Claims10
A pneumatic control system for a press which comprises a pair of start switches, means for supplying air under pressure to the start switches, an or element having one of its input ports connected to each start switch, an and element having one of its input ports connected to each start switch, a normally closed time delay element having its input port connected to an output port of the or element, a not element having its pressure port connected to an output port of the and element, means connected to the output port of the not element for actuating the press, and means connecting the output port of the normally closed time delay element to a switching port of the not element, whereby the press is actuated when both of the start switches are actuated with the time interval between actuation of the start switches being less than the time delay of the normally closed time delay element.
A pneumatic control system for a press which comprises a pair of start switches, means for supplying air under pressure to the start switches, an or element having one of its input ports connected to each start switch, an and element having one of its input ports connected to each start switch, a time delay element connected to an output port of the or element, a not element having its pressure port connected to an output port of the and element, means connected to the output port of the not element for actuating the press, and means connecting the time delay element to a switching port of the not element, whereby the press is actuated when both of the start switches are actuated with the time interval between actuation of the start switches being less than the time delay of the normally closed time delay element.
Dependencies are inferred from the claim text.