B - Operations – Transporting – 41 – J
Patent
B - Operations, Transporting
41
J
101/96
B41J 11/20 (2006.01)
Patent
CA 1320867
ABSTRACT OF THE DISCLOSURE In a printer in which a plurality of hammers mounted along the length of an elongated hammerbank are selectively fired as the hammerbank is reciprocated relative to an elongated platen to impact a length of ink ribbon against at least one length of print paper supported by the platen to effect printing in dot matrix fashion, the platen being rotatable about an axis of rotation to vary the size of a platen gap between the plurality of hammers and the platen, a mechanism is provided for positively locking the platen in any one of a succession of different rotational positions to provide locking platen gap adjustment. The positions are identified in order to facilitate resetting of the platen to a desired gap size. The mechanism includes a rotatable knurled thumbknob having mounted thereon a cam having a succession of eccentric or radially varying detents in an outer surface thereof which receives the end of a pivotally mounted, spring-biased lever. Manual rotation of the thumbknob gradually rotates the lever as the end of the lever is positively positioned in each of the succession of detents. An opposite end of the lever engages a platen handle which is coupled to the platen and which is spring- biased to maintain engagement of the handle with the lever.
602265
Barrus Gordon Brent
Emenaker Leo Joseph
Printronix Inc.
Smart & Biggar
LandOfFree
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