Title:
シート搬送装置及び画像形成装置
Document Type and Number:
Japanese Patent JP6632642
Kind Code:
B2
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.
Inventors:
Toru Miyazawa
Shigemi Kumagai
Shigemi Kumagai
Application Number:
JP2018004912A
Publication Date:
January 22, 2020
Filing Date:
January 16, 2018
Export Citation:
Assignee:
Canon Inc
International Classes:
B65H7/02; B65H5/06; H02P5/52; H02P8/14
Domestic Patent References:
| JP2013209220A | ||||
| JP2009126109A | ||||
| JP2016102814A | ||||
| JP2014024614A | ||||
| JP11119491A | ||||
| JP2017202934A | ||||
| JP2011093670A | ||||
| JP4243761A |
Attorney, Agent or Firm:
Takuma Abe
Sogo Kuroiwa
Sogo Kuroiwa