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US 8,577,248 B2Granted
Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsShuhei Kawasaki, Motoki Adachi, Tomoo Akizuki
Life of this patent
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Abstract
When toner on an intermediate transfer member is picked up by a cleaning unit by transferring the toner to an image bearing member in a recovery operation, pickup conditions are controlled to be changed on the basis of the ambience detected in performing the recovery operation and such that the toner on the intermediate transfer member is picked up by the cleaning unit while being temporarily retained by a secondary transfer roller.
Claims15
An image forming apparatus including
- an image bearing member configured to bear a latent image;
- a developing device configured to develop the latent image with toner;
- a primary transfer device configured to transfer a toner image formed on the image bearing member to an intermediate transfer member;
- a secondary transfer device configured to transfer the toner image primary-transferred to the intermediate transfer member to a sheet of recording material;
- and
- a cleaning device including an elastic cleaning blade being in contact with the image bearing member, the cleaning device being configured to pick up the toner remaining on the image bearing member,
- the image forming apparatus comprising:
- a control device configured to control a pickup sequence in which, after the image forming apparatus has caused any emergency stop, the toner on the intermediate transfer member is returned from the intermediate transfer member to the image bearing member by rotating the intermediate transfer member, whereby the toner is picked up by the cleaning device;
- and
- a temperature detecting device configured to detect a temperature when the pickup sequence is performed,
- wherein, letting temperatures to be detected by the temperature detecting device be a first temperature and a second temperature lower than the first temperature, respectively,
- the pickup sequence includes a first pickup sequence to be performed at the first temperature and a second pickup sequence to be performed at the second temperature, and
- wherein the second pickup sequence is set such that an amount of toner to be returned from the intermediate transfer member to the image bearing member for each unit area of the image bearing member is smaller than that for the first pickup sequence.
10 more elements
An image forming apparatus including
- an image bearing member configured to bear a latent image;
- a developing device configured to develop the latent image with toner;
- a primary transfer device configured to transfer a toner image formed on the image bearing member to an intermediate transfer member;
- a secondary transfer device configured to transfer the toner image primary-transferred to the intermediate transfer member to a sheet of recording material;
- and
- a cleaning device including an elastic cleaning blade being in contact with the image bearing member, the cleaning device being configured to pick up the toner remaining on the image bearing member,
- the image forming apparatus comprising:
- a control device configured to control a pickup sequence in which, after the image forming apparatus has caused any emergency stop, the toner on the intermediate transfer member is returned from the intermediate transfer member to the image bearing member by rotating the intermediate transfer member, whereby the toner is picked up by the cleaning device;
- a temperature detecting device configured to detect a temperature when the pickup sequence is performed;
- and
- a calculating device configured to calculate information on an amount of toner that is present on the intermediate transfer member when the image forming apparatus has caused the emergency stop,
- wherein, letting temperatures to be detected by the temperature detecting device be a first temperature and a second temperature lower than the first temperature, respectively;
- and
- letting amounts of toner, calculated by the calculating device, that is present on the intermediate transfer member at the occurrence of the emergency stop be a first amount of toner and a second amount of toner larger than the first amount of toner, respectively,
- the pickup sequence includes a first pickup sequence to be performed at the first temperature whether the first amount of toner or the second amount of toner, or at the second temperature and for the first amount of toner, and a second pickup sequence to be performed at the second temperature and for the second amount of toner, and
- wherein the second pickup sequence is set such that an amount of toner to be returned from the intermediate transfer member to the image bearing member for each unit area of the image bearing member is smaller than that for the first pickup sequence.
13 more elements
Dependencies are inferred from the claim text.