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:
Jun. 30, 1998
Filed:
Jun. 06, 1997
Naoto Yamaguchi, Nagano, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
An automatic adjusting device for accurately adjusting a platen gap including an encoder 14 for outputting pulse signals in accordance with a moving distance of a carriage, a pulse width detector for detecting a pulse width of the pulse signal when the carriage is moved from a reference position in a direction of the platen, a difference calculator for calculating a difference between a pulse width of the pulse signal sent from the pulse width detector and a pulse width of a stored pulse signal, a contact detector for judging a contact position of the recording head with the platen surface by comparing the difference with the reference value, and a controller for controlling a platen gap in accordance with the thickness of a recording medium charged on the platen detected by a pulse signal sent from the encoder and a signal sent from the contact detector. A change in the pulse width caused by resistance on the carriage is subtracted by the difference detector to obtain correction data so that the contact point can be accurately detected.