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:
Dec. 08, 1987
Filed:
Jul. 17, 1986
Ralf M Brooks, Waterloo, CA;
Brian P Connell, Elmira, CA;
Dennis T Sonnenburg, Waterloo, CA;
Stefan J Pagowski, Kitchener, CA;
NCR Canada Ltd - NCR Canada Ltee, Mississauga, CA;
Abstract
A thermal printing apparatus is disclosed in which ribbon advancing mechanism including a supply spool and a take-up spool operated by a stepping motor is disclosed. Mechanism is provided for reversing the direction in which the take-up spool is driven by a specified amount during the printing cycle, in order to provide ribbon slack, so as to avoid smudging of the transferred ink on the receiving document and possible ribbon breakage during printing. The circumference of the accumulated ribbon on the take-up spool at any given time is considered in determining the number of steps and the step rate of the stepping motor in the reverse direction which must be taken in order to produce the desired amount of ribbon slack and slack take-up.