Advancing material of indeterminate length – By intermittent material-mover – With retrograde movement preventer
Patent
1980-04-25
1981-09-22
Gilreath, Stanley N.
Advancing material of indeterminate length
By intermittent material-mover
With retrograde movement preventer
226162, B65H 1736
Patent
active
042905419
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.
REFERENCES:
patent: 2467740 (1949-04-01), Haller
patent: 3038645 (1962-06-01), Nordlof
patent: 3157334 (1964-11-01), Bunnell et al.
patent: 3329327 (1967-07-01), Scribner
patent: 3462056 (1969-08-01), Scribner
patent: 3485430 (1969-12-01), Scribner
patent: 3512438 (1970-05-01), Burdge
patent: 3523632 (1970-08-01), Shields
patent: 4175688 (1979-11-01), Scribner
patent: 4207999 (1980-06-01), Scribner
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