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US 9,869,953 B2Granted
Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsToshiya Kaino, Jun Asami, Ryuichi Umehara
Life of this patent
Estimating the term…
Abstract
The image forming apparatus, a conveyance speed of a recording material at a fixing nip portion, controlled by a control portion of the image forming apparatus so that a part of the recording material being conveyed touches a guide member between a transfer nip portion and a loop detection device for a period after an operation for maintaining a loop amount of the recording material being conveyed within a predetermined range is finished until the recording material trailing edge exits out the transfer nip portion.
Claims14
An image forming apparatus comprising:
- an image bearing member;
- a transfer member forming a transfer nip portion together with the image bearing member and transferring a toner image borne by the image bearing member onto a recording material while the recording material is conveyed at the transfer nip portion;
- a fixing unit disposed on a downstream side in a conveyance direction of the recording material with respect to the transfer nip portion and fixing the toner image onto the recording material while the recording material is sandwiched and conveyed at the fixing nip portion;
- a guide member provided between the transfer nip portion and the fixing nip portion and guiding the recording material to the fixing nip portion;
- a loop amount detection device provided between the transfer nip portion and the fixing nip portion and detecting a loop amount of the recording material in a state where the recording material being conveyed strides over both the transfer nip portion and the fixing nip portion;
- and
- a control portion for controlling a conveyance speed of the recording material at the fixing nip portion based on a detection signal of the loop amount detection device, the control portion controlling the conveyance speed of the recording material at the fixing nip portion so that the loop amount of the recording material is maintained within a predetermined range,
- wherein during a period after an operation for maintaining the loop amount of the recording material being conveyed within the predetermined range is finished and until a recording material trailing edge exits out the transfer nip portion, the control portion controls the conveyance speed of the recording material at the fixing nip portion so that a part of the recording material touches the guide member between the transfer nip portion and the loop detection device.
5 more elements
An image forming apparatus comprising:
- an image bearing member;
- a transfer member forming a transfer nip portion together with the image bearing member and transferring a toner image borne by the image bearing member onto a recording material while the recording material is conveyed at the transfer nip portion;
- a fixing unit disposed on a downstream side in a conveyance direction of the recording material with respect to the transfer nip portion and fixing the toner image onto the recording material while the recording material is sandwiched and conveyed at the fixing nip portion;
- a guide member provided between the transfer nip portion and the fixing nip portion and guiding the recording material to the fixing nip portion;
- a loop amount detection device provided between the transfer nip portion and the fixing nip portion and detecting a loop amount of the recording material in a state where the recording material being conveyed strides over both the transfer nip portion and the fixing nip portion;
- and
- a control portion for controlling a conveyance speed of the recording material at the fixing nip portion based on a detection signal of the loop amount detection device, the control portion controlling the conveyance speed of the recording material at the fixing nip portion so that the loop amount of the recording material is maintained within a predetermined range,
- wherein during a period after an operation for maintaining the loop amount of the recording material being conveyed within the predetermined range is finished and until a recording material trailing edge exits out the transfer nip portion, the control portion decreases the conveyance speed of the recording material at the fixing nip portion.
5 more elements
Dependencies are inferred from the claim text.