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. 27, 1983
Filed:
Nov. 20, 1981
Karl-Heinz Dreinhoff, Berlin, DE;
Hermann Wambach, Unterhaching, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
A typewriter ribbon cassette contains a feed spool and a take-up spool which are both displaceably arranged in guide slots in the cassette housing. The guide slot for the feed spool leads to a control corner edge opening into an enlarged recess. The feed spool is biased with a spring force towards the control edge of the slot during unwinding of the ribbon roll, so that, when the feed spool has overrun the control edge, the spool is pivoted into a switching position which can be detected by a monitoring device for signalling an end of tape state of the ribbon roll. The hub of the feed spool is provided with a guide pilot for sliding along the guide slot which has a cornered plan profile for holding the hub in a straight line path along the slot until after the control edge is overrun.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile