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:
Jan. 24, 1984
Filed:
Jan. 15, 1982
Shunzo Inoue, Yokohama, JP;
Takeshi Nagasawa, Yokohama, JP;
Toshio Iwaya, Shiki, JP;
Michio Kasuya, Fuchu, JP;
Shinji Murata, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An apparatus for detecting the length of web wound on a bobbin. The apparatus detects the amount of rotation of the bobbin and the amount of feed of the web and detects the amount of roll by an operation on the basis of the detected amounts. The amount of rotation of the bobbin is detected by the pulses generated in response to the rotation of the bobbin and counted by a first counter. The amount of feed of the web is detected by the pulses generated in response to the feeding of the web and counted by a second counter. The amount of roll is calculated by an operation device on the basis of the count values of the first and second counters.