Image forming apparatus

Patent metadata

Field	Value
Publication number	US-2018017909-A1
Application number	US-201715646549-A
Country	US
Kind code	A1
Filing date	Jul 11, 2017
Priority date	Jul 12, 2016
Publication date	Jan 18, 2018
Grant date	—

Abstract

An image forming apparatus includes an image forming station for forming a toner image on a sheet; a heating roller and a pressing roller which form a nip for fixing the toner image on the sheet; a heat absorption roller for absorbing heat by contacting the pressing roller; a moving mechanism for moving the heat absorption roller to and away from the pressing roller; a detector for detecting an abnormal state that heat absorption roller remains contacted the pressing roller; and a controller for controlling an interval between adjacent sheets when image forming operation is continuously carried out for a plurality of sheets, wherein when the detector does not detect the abnormal state, the controller supplies the sheets at a first feeding interval, and when the detector detects the abnormal state, the controller supplies of the sheets at a second feeding interval longer than the first interval.

First claim

What is claimed is:

1 . An image forming apparatus comprising:
an image forming station configured to form a toner image on a recording material; a rotatable heating member and a rotatable pressing member which are configured to form a nip for fixing the toner image on the recording material; a rotatable heat absorption member configured to absorbing heat by contacting said rotatable pressing member; a moving mechanism configured to move said rotatable heat absorption member to and away from said rotatable pressing member; a detecting portion configured to detect an abnormal state the rotatable heat absorption member remains contacted with said rotatable pressing member; and a controller configured to control an interval between adjacent recording materials when image forming operation is continuously carried out for a plurality of recording materials, wherein when said detecting portion does not detect the abnormal state, said controller supplies the recording materials into the nip at a first feeding interval, and when said detecting portion detects the abnormal state, said controller supplies of the recording materials into the nip at a second feeding interval which is longer than the first interval.

2 . An apparatus according to claim 1 , wherein when said detecting portion detects the abnormal state, said controller, said controller supplies the recording material of the first feeding interval, after the supplying at the second feeding interval is carried out for a predetermined period.

3 . An apparatus according to claim 2 , wherein the predetermined period corresponds to reaching of the number of recording materials on which the images are formed during the image forming operation to a predetermined number.

4 . An apparatus according to claim 2 , wherein the predetermined period corresponds to reaching of a operating time period for the image forming operation to a predetermined period.

5 . An apparatus according to claim 1 , wherein the image forming operation is the operation for image formation on a maximum width recording material which is usable with said image forming apparatus.

6 . An image forming apparatus comprising:
an image forming station configured to form a toner image on a recording material; a rotatable heating member and a rotatable pressing member which are configured to form a nip for fixing the toner image on the recording material; a rotatable heat absorption member configured to absorbing heat by contacting said rotatable pressing member; a moving mechanism configured to move said rotatable heat absorption member to and away from said rotatable pressing member; a detecting portion configured to detect an abnormal state that said rotatable heat absorption member is unable to contact said rotatable pressing member and remains spaced from said rotatable pressing member; and a controller configured to control a interval between adjacent recording materials when image forming operation is continuously carried out for a plurality of predetermined recording materials which have widths smaller than a maximum width which is usable with said image forming apparatus, wherein when said detecting portion detects the abnormal state, said controller supplies of the recording materials into the nip at a first feeding interval, for a predetermined period, and thereafter, said control of supplies of the recording material into the nip at a second feeding interval which is longer than the first interval.

7 . An apparatus according to claim 6 , wherein when said detecting portion does not detect the abnormal state, said controller supplies the recording materials into the nip at a first feeding interval, until the number of the recording materials for which the image forming operation is carried out reaches a predetermined number, and thereafter, said controller contacts said rotatable heat absorption member to said rotatable pressing member.

8 . An apparatus according to claim 6 , further comprising a temperature sensor for detecting a temperature of a area at a longitudinal end portion of said rotatable heating member, wherein when said detecting portion does not detect the abnormal state, said controller supplies the recording materials on the first interval until the temperature detected by said temperature sensor reaches a predetermined temperature, and thereafter, said controller contacts said rotatable heat absorption member to said rotatable pressing member.

Assignees

• Canon Kk

Inventors

• Mogi Keisuke

Classifications

• G03G2215/00603

  Control of other part of the apparatus according to the state of copy medium feeding · CPC title

• G03G15/2028

  with means for handling the copy material in the fixing nip, e.g. introduction guides, stripping means · CPC title

• G03G15/2042 Primary

  specially for the axial heat partition · CPC title

• G03G15/205

  specially for the mode of operation, e.g. standby, warming-up, error (G03G15/2046 takes precedence) · CPC title

• G03G15/2025

  with special means for lubricating and/or cleaning the fixing unit, e.g. applying offset preventing fluid · CPC title