Control system for pneumatic punch press feeders
OwnerAlbert W. Scribnerinventor
Life of this patent
Estimating the term…
Abstract
A pneumatic control system for a semi-automatically operating feeder for punch presses and the like. A pair of interconnected main three-way valves control the operation of the fluid motors that respectively actuate the reciprocally mounted feed slide and the stock gripping means carried by the feed slide. These two three-way valves are adapted to be controlled by a trigger means that includes a pair of serially coupled two-way valves that are sequentially mechanically actuated by a control plunger, and by a stroke reverse means that includes a safety valve feature that will operationally accommodate small leaks that may be present in the associated portions of the control circuit so as to prevent the inadvertent initiation of an undesired feed-index cycle of movement of the feed slide.
Claims19
A pneumatic feeder for intermittently advancing stock into the work station of a punch press or the like;
- comprising
- a frame;
- a feed slide reciprocally mounted on said frame;
- stock gripping means mounted said feed slide;
- fluid motor means for actuating said feed slide and stock gripping means through stock feed and index strokes;
- main valve means for controlling the operation of said fluid motor means;
- trigger means operative to control said valve means so as to cause initiation of a feed stroke of said feed slide;
- said trigger means including;
- a plunger means that is adapted to be movable between a normal position and a depressed position in response to the operation of said press;
- a pair of valves effectively coupled in series and each having a valving element associated therewith that is adapted to be displaced by the said movement of said plunger means so that both of said valves are open during only a predetermined portion of the movement of said plunger means;
- and
- reverse means operative in response to the terminal portion of said feed stroke for controlling said valve means so as to cause initiation of an index stroke of said feed slide.
A pneumatic feeder for intermittently advancing stock into the work station of a punch press or the like;
- comprising
- a frame;
- a feed slide reciprocally mounted on said frame;
- stock gripping means mounted said feed slide;
- fluid motor means for actuating said feed slide and stock gripping means through stock feed and index strokes;
- main valve means for controlling the operation of said fluid motor means;
- trigger means operative to control said valve means so as to cause initiation of a feed stroke of said feed slide;
- said trigger means comprising
- a plunger;
- valve body means carrying said plunger for axial reciprocation between normal and depressed positions;
- said body means including a fluid output line;
- shoulder means carried by said plunger, said shoulder means defining a movable portion of a normally open spool type two-way valve that is pneumatically coupled to said output line;
- a poppet valve disc axially movable carried adjacent the end of said plunger, said valve disc defining a movable portion of a normally closed two-way poppet valve that is pneumatically coupled through said normally open spool type two-way valve to said output line;
- said spool type two-way valve and said poppet type two-way valve both being open during the terminal portion of the axial movement of said plunger back to its said normal position;
- and
- reverse means operative in response to the terminal portion of said feed stroke for controlling said valve means so as to cause initiation of an index stroke of said feed slide.
A pneumatic feeder for intermittently advancing stock into the work station of a punch press or the like;
- comprising
- a frame;
- a feed slide reciprocally mounted on said frame;
- stock gripping means mounted said feed slide;
- fluid motor means for actuating said feed slide and stock gripping means through stock feed and index strokes;
- main valve means for controlling the operation of said fluid motor means;
- trigger means operative to control said valve means so as to cause initiation of a feed stroke of said feed slide;
- reverse means operative in response to the terminal portion of said feed stroke for controlling said valve means so as to cause initiation of an index stroke of said feed slide;
- and
- safety means associated with said reverse means for permitting relatively small amounts of pressure fluid from the associated pneumatic circuit lines to exhaust to the surrounding atmospheric medium so that said valve means will not be actuated by small fluid pressure leaks that may be present in the associated pneumatic circuit.
Dependencies are inferred from the claim text.