Rotator driving device, image forming apparatus using the rotator driving device, and method of driving rotator
AssigneeMinolta Co., Ltd.
InventorsTakahiro Tsujimoto, Akira Takasu
Life of this patent
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Abstract
Rotational force of a driving motor is transferred to a photosensitive drum via a planetary-roller reduction device, so that the photosensitive drum is rotated. A speed detector set on the shaft of the photosensitive drum detects the rotational speed of the photosensitive drum. In accordance with the detected rotational speed of the photosensitive drum, the rotational speed of the driving motor is adjusted so that the photosensitive drum is rotated at a constant speed.
Claims33
A rotator driving device that rotationally drives a rotator, comprising:
- a motor;
- a planetary-roller reduction unit that outputs a rotational speed that is reduced with respect to a rotational speed of the motor, and transfers a rotational drive force of the motor to the rotator;
- a speed detector that detects a rotational speed of the rotator;
- and
- a controller that controls the rotational speed of the motor in accordance with a detection result obtained by the speed detector.
A rotator driving device that is provided in an image forming apparatus and that drives first and second rotators provided in the image forming apparatus, the rotator driving device comprising:
- a driving unit that includes a motor and supplies a rotational drive force of the motor to the first rotator;
- a speed detector that detects a rotational speed of the first rotator;
- a controller that controls a rotational speed of the motor in accordance with a detection result obtained by the speed detector;
- and
- a drive branching unit that branches the rotational drive force of the motor and transfers the branched rotational drive force to the second rotator.
A rotator-driving method for driving first and second rotators, comprising the steps of:
- rotationally driving the first rotator using a rotational drive force of a motor, branching the rotational drive force using a drive branching unit, and rotationally driving the second rotator using the branched rotational force;
- detecting a rotational speed of the first rotator using a speed detector;
- and
- controlling a rotational speed of the motor in accordance with the rotational speed of the first rotator detected by the speed detector.
A rotator driving device that drives first and second rotators, comprising:
- a motor that supplies a rotational drive force to the first rotator;
- and
- a drive branching unit that branches the rotational drive force, the branched rotational drive force being used for driving the second rotator, wherein the drive branching unit has a main rotating member and a slave rotating member, the main rotating member being set coaxial with the first rotator and so rotating as the first rotator rotates and the slave rotating member being connected to the second rotator and rotating together with the main rotating member owing to a magnetic action exerted between the main and slave rotating members.
A rotator-driving method for driving first and second rotators, comprising the steps of:
- rotationally driving the first rotator using a rotational drive force of a motor;
- transferring the rotational drive force via main and slave rotating members to the second rotator so that the second rotator is rotationally driven, the main rotating member being set coaxial with the first rotator and so rotating as the first rotator rotates, and the slave rotating member rotating together with the main rotating member owing to a magnetic action exerted between the main and slave rotating members.
Dependencies are inferred from the claim text.