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:
Oct. 10, 1995
Filed:
May. 25, 1993
Christopher B Wright, San Francisco, CA (US);
Alan C Allison, Pacifica, CA (US);
Duplex Printer, Inc., Los Angeles, CA (US);
Abstract
A printer has dual opposing printheads which can print in tandem on two sides of paper fed along a printing plane. The dual opposing printheads can print the same information on each side of two paper sheets fed in back-to-back (two-ply) fashion, thereby providing a document and copy simultaneously. The printer can also print different information on two sides of the same paper sheet or on each side of two paper sheets, thereby doubling the printing speed as compared to a single printhead. In a preferred embodiment, the dual opposing printheads are mounted in carriages driven reciprocatingly in tandem by one drive belt. Tandem paper feed mechanisms are arranged at one side of the printer and have respective clutch spring devices which are actuated alternately by cam surfaces on the printhead carriages so as to drive a pair of paper feed rollers with the paper fed in between them. Due to the capability for two-sided printing and elimination of the need for making carbon copies, the printer can use quiet, lightweight inkjet printheads for printing with double the usual output printing speed, as well as employ new types of one and two-ply plain paper printer forms.