Typewriting machines – Sheet or web – For feeding web record-medium
Patent
1987-07-23
1989-09-12
Wright, Jr., Ernest T.
Typewriting machines
Sheet or web
For feeding web record-medium
400706, 226 76, 226 87, B41J 1128
Patent
active
048654787
ABSTRACT:
A retractable pin sprocket drive for feeding paper employs free floating, radially moving, cam actuated sprocket pins in axially spaced sprocket hubs forming sprocket wheels. The pins are slidably fitted in equally angularly spaced radial slots in each sprocket hub. The sprocket wheels are each journalled in a sprocket wheel housing and the sprocket pins are moved radially only by a stationary cam track in each sprocket housing as the sprocket wheels rotate. Insertion of paper having perforated edges is facilitated by means providing for the precise axial spacing of the sprocket wheels and angular positioning of the sprocket wheels and pins in relation to the perforations or holes along the edges of the paper, together with transparent sprocket wheel housings and openings therethrough permitting viewing of the sprocket pins and the holes in the paper as they come together, to permit precise sprocket pin insertion into the holes in the paper.
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Chan Lawrence W.
Doan Alpha N.
Torgerson Curt N.
Wield Paul J.
Hewlett -Packard Company
Wright, Jr. Ernest T.
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