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:
Jul. 28, 2020
Filed:
Dec. 13, 2018
Canon Kabushiki Kaisha, Tokyo, JP;
Toru Miyazawa, Nagareyama, JP;
Shigemi Kumagai, Kashiwa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A sheet conveyance apparatus includes a stacking unit having a sheet, a feeding unit, a conveyance roller to convey a sheet fed by the feeding unit, a motor to drive the conveyance roller, a phase determiner, first and second controllers, and a discriminator. The feeding unit feeds the sheet. The phase determiner determines a motor rotor rotational phase. The first controller controls a drive current flowing in a motor winding to reduce a deviation between an instructed phase of the motor rotor and the determined rotational phase. The second controller controls to perform a first drive for driving the conveyance roller for a predetermined time before a feeding unit feed operation is started. The discriminator discriminates presence or absence of the sheet at a nip portion of the conveyance roller based on a value of a parameter corresponding to load torque applied to the rotor during the first drive.