Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorHiroshi Kawamura
Life of this patent
Estimating the term…
Abstract
Provided is an image forming apparatus capable of preventing unnecessary sheet feeding when power is turned on. A state of a drive transmission portion 14A provided to transmit the driving of a drive portion to a feeding roller when a sheet is fed is switched from a second state that the driving of the drive portion is not transmitted to the feeding roller by a solenoid 19 to a first state that the driving of the drive portion is transmitted to the feeding roller and keep it. The controller for controlling the switching of the solenoid 19 and the driving of the drive portion to rotate the feeding roller drives the drive portion for a time necessary to return the drive transmission portion 14A from the first state to the second state to make the drive transmission portion 14A be in the second state when power is turned on.
Claims7
An image forming apparatus that forms an image on a sheet fed by a feeding roller from a sheet cassette mounted on an apparatus main body, the image forming apparatus comprising:
- a drive portion that is provided in the apparatus main body to drive the feeding roller;
- a drive transmission portion that is capable of changing between a first state in which the driving of the drive portion is transmitted to the feeding roller to feed the sheet by the feeding roller and a second state in which the driving of the drive portion is not transmitted to the feeding roller;
- a switching portion that switches the drive transmission portion from the second state to the first state to make the feeding roller feed the sheet, and that returns the drive transmission portion, from the first state to the second state and stays in the second state;
- and
- a controller that drives the drive portion for a time necessary to return the drive transmission portion from the first state to the second state so as to make the drive transmission portion be in the second state when the apparatus main body is initially installed and a power of the apparatus main body is turned on.
An image forming apparatus that forms an image on a sheet fed by a feeding roller from a sheet cassette mounted on an apparatus main body, the image forming apparatus comprising:
- a drive portion that is provided in the apparatus main body to drive the feeding roller;
- a drive transmission portion including a drive gear rotated by a driving force of the drive portion and a tooth-chipped gear that meshes with the drive gear to rotate the feeding roller, wherein the drive transmission portion is capable of changing between a first state in which the tooth-chipped gear meshes with the drive gear and a second state in which the tooth-chipped portion of the tooth-chipped gear faces to the drive gear;
- a switching portion that switches the drive transmission portion from the second state to the first state to make the feeding roller feed the sheet, and that returns the drive transmission portion from the first state to the second state and stays in the second state;
- a detection portion that detects a position of the tooth-chipped gear when a sheet feeding is resumed after the sheet feeding stops;
- and
- a controller that drives the drive portion for a time necessary to return the drive transmission portion from the first state to the second state in a case where a position of the tooth-chipped gear detected by the detection portion is not in the second state.
Dependencies are inferred from the claim text.