US 12,362,689 B2Granted

Image forming apparatus

AssigneeCanon Kabushiki Kaisha

InventorYohei Ohashi

Life of this patent

Estimating the term…

Loading patent…

Abstract

An image forming apparatus includes a photosensitive member, an intermediate transfer member, a moving member, a driving motor, a stepper motor, a detector, a phase determiner, and a controller. The stepper motor drives the moving member to move between a first position at which the photosensitive member contacts the intermediate transfer member and a second position at which the photosensitive member contacts the intermediate transfer member are separated. The controller includes a first control mode to control a motor based on a predetermined current magnitude and a second control mode to control a motor by vector control. The controller starts driving the driving motor in the first control mode, and then switches from the first control mode to the second control mode. The controller controls the stepper motor in the first control mode during a period from when the stepper motor is activated to when the stepper motor is stopped.

Claims17

Dependent claims

A sheet conveying apparatus comprising:

a first rotating member configured to rotate;
a second rotating member configured to rotate and form a nip portion with the first rotating member;
a moving unit configured to move the first rotating member to adjust a distance between the first rotating member and the second rotating member;
a conveyance roller configured to convey a sheet;
a first motor configured to drive the conveyance roller;
a second motor configured to drive the moving unit;
a phase determiner configured to determine a rotation phase of a rotor of the first motor;
and
a controller configured to perform control including a first control mode to control a motor based on a current having a predetermined magnitude and a second control mode to control a motor by vector control based on the rotation phase determined by the phase determiner,
wherein the conveyance roller conveying the sheet is driven by the first motor controlled in the second control mode, and the moving unit moving the first rotating member is driven by the second motor controlled in the first control mode.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/506,042Filed 9 Nov 2023 · division
Priority: JP 2020-19874630 Nov 2020
Published: US 2024/0079976 A17 Mar 2024
Granted: 15 Jul 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

H02P 5/74
Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors: controlling two or more AC…
B41J 11/007
Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in…:…
G03G 15/0136
For transferring a pattern to a second base: transfer member separable from recording member or vice versa, mode switching
G03G 15/50
Apparatus for electrographic processes using a charge pattern: machine control of apparatus for electrographic processes using a charge pattern,…

Family

Application17/533,935Parent of this division · filed 23 Nov 2021
US 2024/0079976 A1Pre-grant publication · published 7 Mar 2024
US 11,843,341 B2Parent of this division
US 2022/0173674 A1Published application
US 12,362,689 B2This patent

From the US filing history. Foreign family members aren’t listed.