Printing – Selective or progressive – Bed and platen machines
Patent
1976-03-08
1977-07-26
Coren, Edward M.
Printing
Selective or progressive
Bed and platen machines
197 49, 173119, 173133, B41J 902
Patent
active
040375323
ABSTRACT:
A hammer assembly comprising a housing having opposing open ends and an internal passage extending between the open ends. A hammer element is positioned in the housing for reciprocal movement in the passage between first and second positions. The hammer element has an opening formed therein in which a biasing member is positioned. When enabled, the biasing member is capable of biasing the hammer element in a desired direction relative to the first and second positions. Means are also included for enabling the biasing member when the hammer element is in at least its first position. The housing is desirably fabricated of a self-lubricating material with the area of the opening at one of its ends substantially larger than the cross-sectional area of the hammer element, taken along a plane perpendicular to the axis of motion of the hammer element at such one end in order for air to be freely vented from the passage during reciprocal movement of the hammer assembly.
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Plaza Mario G.
Weisberg Michael C.
Anderson T. J.
Colitz M. J.
Coren Edward M.
Smith B. P.
Xerox Corporation
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