US 2004/0165915 A1Published application

Image forming apparatus and image forming method

AssigneeCanon Kabushiki Kaisha

InventorsMasahide Hirai, Akihiro Fujimoto

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Abstract

The image forming apparatus includes a photosensitive drum, an image forming unit, an intermediate transfer belt, a circuit of a drive motor which outputs information on a moving distance, a registration roller, a CPU which calculates the predetermined timing on the basis of the information on the moving distance output by the circuit of the drive motor at the time when a rotation speed of the intermediate transfer belt is switched from a first process speed to a second process speed, and a memory storing the information on the predetermined timing calculated by the CPU, wherein the CPU controls the registration roller so as to start the conveyance of the recording material at the predetermined timing stored in the memory. Consequently, a positional relation between a leading end of the recording material and a leading end of the image formed on the recording material can be set as a desired positional relation.

Claims12

Dependent claims

An image forming apparatus, comprising:

an image bearing member for bearing a toner image;
an image forming unit for forming a toner image on said image bearing member;
an intermediate transfer member to which the toner image is primarily transferred from said image bearing member, said intermediate transfer member rotating while being in contact with said image bearing member;
an output unit for outputting information on a moving distance at a time when said intermediate transfer member rotates;
a conveying unit which, in an attempt to secondarily transfer the toner image on the intermediate transfer member to a predetermined position on a recording material, starts conveyance of the recording material at a predetermined timing;
a calculation unit for calculating the predetermined timing on a basis of the information on the moving distance which is output by said output unit at a time when a rotation speed of the intermediate transfer member is switched from a first speed to a second speed lower than the first speed;
a storage unit for storing information on the predetermined timing calculated by said calculation unit;
and
a control unit for controlling a rotation of an intermediate transfer member and a conveyance of a recording material by said conveying unit,
wherein, in a case in which a rotation speed of said intermediate transfer member is switched from the first speed to the second speed lower than the first speed to secondarily transfer the toner image on said intermediate transfer member to the predetermined position on the recording material, said control unit controls said conveying unit to start the conveyance of the recording material at the predetermined timing stored in said storage unit.

7 more elements

An image forming apparatus, comprising:

an image bearing member for bearing a toner image;
an image forming unit for forming a toner image on the image bearing member;
an intermediate transfer member to which the toner image is primarily transferred from the image bearing member, the intermediate transfer member rotating while being in contact with the image bearing member;
an output unit for outputting pulse signals in a number corresponding to a moving distance at the time when the intermediate transfer member rotates;
a conveying unit, in an attempt to secondarily transfer the toner image on the intermediate transfer member to a predetermined position on a recording material, for starting conveyance of the recording material;
and
a control unit for controlling the rotation of the intermediate transfer member and the conveyance of the recording material by the conveying unit,
wherein, in the case in which the rotation speed of the intermediate transfer member is switched from the first speed to the second speed lower than the first speed to secondarily transfer the toner image on the intermediate transfer member to a predetermined position on the recording material, the control unit controls the conveying unit to start the conveyance of the recording material as the number of pulses output by the output unit after the switching from the first speed to the second speed is started, has reached a predetermined number of pulses.

5 more elements

An image forming apparatus, comprising:

an image bearing member for bearing a toner image;
an image forming unit for forming a toner image on the image bearing member;
an intermediate transfer member to which the toner image is primarily transferred from the image bearing member, the intermediate transfer member rotating while being in contact with the image bearing member;
an output unit for outputting pulse signals in a number corresponding to a moving distance at the time when the intermediate transfer member rotates;
a conveying unit, in an attempt to secondarily transfer the toner image on the intermediate transfer member to a predetermined position on a recording material, for starting conveyance of the recording material;
and
a control unit for controlling the rotation of the intermediate transfer member and the conveyance of the recording material by the conveying unit,
wherein, in the case in which the rotation speed of the intermediate transfer member is switched from the first speed to the second speed lower than the first speed to secondarily transfer the toner image on the intermediate transfer member to the predetermined position on the recording material, the control unit controls the conveying unit to start the conveyance of the recording material as the number of pulses output by the output unit after the formation of the toner image on the image bearing member in the image forming unit is started, has reached a predetermined number of pulses.

5 more elements

Dependencies are inferred from the claim text.