Sheet processing apparatus and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorKenichi Hayashi
Life of this patent
Estimating the term…
Abstract
A sheet processing apparatus, by which a failure in control does not occur even if cutting wastes are conveyed by a conveying unit and an image forming apparatus having the sheet processing apparatus are provided. The sheet processing apparatus has a cutter unit for cutting a sheet, a dust box for accommodating the cutting wastes, a conveying belt pair which conveys the cut sheet, sensors for detecting the sheet conveyed by the conveying belt pair, and a controller for controlling conveyance of the sheet based on the signals detected by the sensors, wherein when the length of the sheet detected by the sensor is equal to or less than a predetermined amount, the controller does not determine the sheet as a sheet.
Claims16
A sheet processing apparatus comprising:
- a cutting unit which cuts a sheet into a cut sheet and cutting waste;
- a conveying unit which conveys the sheet cut by the cutting unit;
- a detection unit which detects a passage of the sheet conveyed by the conveying unit;
- and
- a controller which determines a length in the sheet conveying direction of the conveyed sheet based on a detection result of the detection unit, wherein
- the controller determines that the sheet is cutting waste when a determined length in the sheet conveying direction of the conveyed sheet is equal to or less than a predetermined length,
- the controller determines that the sheet is a cut sheet when the determined length in the sheet conveying direction of the conveyed sheet is longer than the predetermined length, and
- when the detection unit is in a sheet detection state before the sheet begins to be conveyed by the conveying unit, the controller controls the conveying unit so that the sheet is conveyed by a conveying amount corresponding to the predetermined length in the sheet conveying direction, and when the detection unit stops detecting the sheet after the sheet is conveyed by the conveying amount, the controller determines that the sheet is cutting waste.
An image forming apparatus comprising an image forming unit and a sheet processing apparatus which cuts and conveys a sheet on which an image is formed,
- wherein the sheet processing apparatus includes:
- a cutting unit which cuts a sheet into a cut sheet and cutting waste;
- a conveying unit which conveys the sheet cut by the cutting unit;
- a detection unit which detects a passage of the sheet conveyed by the conveying unit;
- and
- a controller which determines a length in the sheet conveying direction of the conveyed sheet based on a detection result of the detection unit, wherein
- the controller determines that the sheet is cutting waste when a determined length in the sheet conveying direction of the conveyed sheet is equal to or less than a predetermined length,
- the controller determines that the sheet is a cut sheet when the determined length in the sheet conveying direction of the conveyed sheet is longer than the predetermined length, and
- when the detection unit is in a sheet detection state before the sheet begins to be conveyed by the conveying unit, the controller controls the conveying unit so that the sheet is conveyed by a conveying amount corresponding to the predetermined length in the sheet conveying direction, and when the detection unit stops detecting the sheet after the sheet is conveyed by the conveying amount, the controller determines that the sheet is cutting waste.
Dependencies are inferred from the claim text.