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:
May. 25, 2004
Filed:
Sep. 25, 2002
Alfredo G. Kniazzeh, Waltham, MA (US);
James W. Slack, III, Lexington, MA (US);
Polaroid Corporation, Waltham, MA (US);
Abstract
A multi-head tandem printer is disclosed which includes an optical encoder or other device mounted on a roller (the “encoder roller”) in contact with the print media. The device and encoder roller serve as a tachometer to measure the media transport speed (referred to herein as the “print speed”). The print heads are arranged so that the unloaded receiver length between two print heads is an integral multiple of the unloaded receiver length transported for each revolution of the encoder roller. In one embodiment, the print heads are arranged so that the inter-head spacing is an integer multiple of the circumference of the encoder roll. Adjustments may be made to the inter-head spacing to take into account factors such as the thickness of the receiver and the curvature at the line of receiver contact with the encoder roll. Such techniques may be employed to reduce the effect of mechanical errors on color registration.