The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 12, 1989
Filed:
Jul. 23, 1987
Lawrence W Chan, San Diego, CA (US);
Alpha N Doan, San Diego, CA (US);
Curt N Torgerson, San Diego, CA (US);
Paul J Wield, San Diego, CA (US);
Hewlett Packard Company, Palo Alto, CA (US);
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.