IMAGE FORMING APPARATUS
First Claim
1. An image forming apparatus that is controlled so as to transfer a toner image formed on the peripheral surface of a photoreceptor drum to a recording medium by electrophotography, comprising:
- an image forming portion including the photoreceptor drum on which a toner image is formed based on the electrostatic latent image formed thereon;
a developing portion having a developing roller for supplying toner to the photoreceptor drum;
a recording medium conveyor for conveying a recording medium toward the photoreceptor drum;
a controller for controlling the drive of the recording medium conveyor; and
a transfer portion for transferring the toner image formed on the photoreceptor drum to the recording medium being conveyed, characterized in thatthe recording medium conveyor conveys the recording medium in such a manner that the leading end of the recording medium collides with the photoreceptor drum;
the controller includes;
an eccentricity detector for detecting the eccentric variation of the peripheral surface of the photoreceptor drum; and
a phase detector for detecting the rotational phase of the photoreceptor drum; and
the controller corrects the timing of driving the recording medium conveyor based on the eccentric variation detected by the eccentricity detector and the rotational phase detected by the phase detector.
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Accused Products
Abstract
An image forming apparatus includes a photoreceptor drum, a developing roller, a registration roller for positioning and conveying the paper and a drive controller for controlling the drive of the registration roller. The registration roller conveys the paper so that its leading end collides with the photoreceptor drum. The drive controller corrects the timing of driving the registration roller based on the detected eccentric variation of the peripheral surface of the photoreceptor drum and the rotational phase. The drive controller may acquire the eccentric variation as external data instead of detecting it.
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Citations
33 Claims
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1. An image forming apparatus that is controlled so as to transfer a toner image formed on the peripheral surface of a photoreceptor drum to a recording medium by electrophotography, comprising:
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an image forming portion including the photoreceptor drum on which a toner image is formed based on the electrostatic latent image formed thereon; a developing portion having a developing roller for supplying toner to the photoreceptor drum; a recording medium conveyor for conveying a recording medium toward the photoreceptor drum; a controller for controlling the drive of the recording medium conveyor; and a transfer portion for transferring the toner image formed on the photoreceptor drum to the recording medium being conveyed, characterized in that the recording medium conveyor conveys the recording medium in such a manner that the leading end of the recording medium collides with the photoreceptor drum; the controller includes;
an eccentricity detector for detecting the eccentric variation of the peripheral surface of the photoreceptor drum; and
a phase detector for detecting the rotational phase of the photoreceptor drum; andthe controller corrects the timing of driving the recording medium conveyor based on the eccentric variation detected by the eccentricity detector and the rotational phase detected by the phase detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An image forming apparatus that is controlled so as to transfer a toner image formed on the peripheral surface of a photoreceptor drum to a recording medium by electrophotography, comprising:
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an image forming portion including the photoreceptor drum on which a toner image is formed based on the electro static latent image formed thereon; a developing portion having a developing roller for supplying toner to the photoreceptor drum; a recording medium conveyor for conveying a recording medium toward the photoreceptor drum; a controller for controlling the drive of the recording medium conveyor; and a transfer portion for transferring the toner image formed on the photoreceptor drum to the recording medium being conveyed, characterized in that the recording medium conveyor conveys the recording medium in such a manner that the leading end of the recording medium collides with the photoreceptor drum; the controller includes a phase detector for detecting the rotational phase of the photoreceptor drum; and the controller corrects the timing of driving the recording medium conveyor based on the rotational phase detected by the phase detector and based on the acquired photoreceptor drum correcting information including eccentricity information on the peripheral surface of the photoreceptor drum and the rotational phase information of the photoreceptor drum. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification