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. 18, 1990
Filed:
Jun. 19, 1989
Shuhei Okamori, Nagoya, JP;
Brother Kogyo Kabushiki Kaisha, Aichi, JP;
Abstract
An apparatus for detecting the presence or absence of a recording medium in a printer includes a photo-electric sensor, a reference determining device, a memory, and a judging device. The photo-electric sensor is disposed adjacent to a predetermined position in a feeding path of the printer. In a reference setting mode, the reference determining device determines a reference based on an output signal generated by the photo-electric sensor. The determined reference is stored in the memory. In a printing mode, the judging device compares the output signal of the photo-electric sensor with the reference, and judges whether or not the recording medium is present at the predetermined position.