Image forming apparatus driving conveying medium or intermediate transferring medium and control method therefor
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G03G-015/01
G03G-015/00
출원번호
US-0357209
(2003-02-04)
우선권정보
JP-0032265 (2002-02-08)
발명자
/ 주소
Watanabe, Kenji
Kameyama, Shigeru
출원인 / 주소
Canon Kabushiki Kaisha
대리인 / 주소
Fitzpatrick, Cella, Harper & Scinto
인용정보
피인용 횟수 :
8인용 특허 :
2
초록▼
A color image forming apparatus has an intermediate transferring body or a driven roller speed detector that is driven by a conveying belt; a calculation device for calculating a difference between a target speed and the speed of the intermediate transferring body or of the conveying belt; and a dri
A color image forming apparatus has an intermediate transferring body or a driven roller speed detector that is driven by a conveying belt; a calculation device for calculating a difference between a target speed and the speed of the intermediate transferring body or of the conveying belt; and a drive controller for employing the speed difference obtained by the calculation device to correct the speed of the intermediate transferring body or of the conveying belt. In a low-speed printing mode, before an actual image is formed on a transfer material conveyed along the conveying belt or on the intermediate transferring body, speed correction is performed at the 1/1-speed and, after the speed correction has been completed, the speed in the low-speed mode is determined, and the speed correction for the intermediate transferring body or the conveying belt is not thereafter performed during the printing.
대표청구항▼
1. An image forming apparatus comprising:an image forming unit adapted to form an image;a conveying medium adapted to convey a transfer medium to which the image formed by the image forming unit is transferred;a driving unit adapted to drive the conveying medium at a multiple speed mode,a detector a
1. An image forming apparatus comprising:an image forming unit adapted to form an image;a conveying medium adapted to convey a transfer medium to which the image formed by the image forming unit is transferred;a driving unit adapted to drive the conveying medium at a multiple speed mode,a detector adapted to detect a conveying speed of the conveying medium; anda controller adapted to control a driving condition of the driving unit based on a detection result obtained by the detector,wherein the controller determines, based on a detection result at a first speed mode among the multiple speed mode, a driving condition for a second speed mode which is different from the first speed mode. 2. An image forming apparatus according to claim 1,wherein the driving unit includes a driving roller for driving the conveying medium, and a motor for rotating the driving roller. 3. An image forming apparatus according to claim 1,wherein the detector includes a sensor for outputting a pulse signal in synchronization with the rotation of a roller. 4. An image forming apparatus according to claim 3,wherein the detector includes a determination unit adapted to obtain a predetermined number of pulse signals output from the sensor, and to measure intervals for the pulses to detect the conveying speed of the conveying medium. 5. An image forming apparatus according to claim 4,wherein the controller repeats a control process based on the driving condition determined by the determination unit, by a predetermined number of times. 6. An image forming apparatus according to claim 3,wherein the roller is a driven roller which is rotated in synchronization with the conveying of the conveying medium. 7. An image forming apparatus according to claim 1,wherein the detector is an optical sensor. 8. An image forming apparatus according to claim 1,wherein after the driving condition is determined, the driving condition is maintained during image forming in the second speed mode. 9. An image forming apparatus according to claim 1,wherein the multiple speed mode comprises a normal speed mode and a low speed mode which drives at a lower speed than the normal speed mode, andwherein the controller determines a driving condition for the low speed mode based on a detection result at the normal speed mode. 10. An image forming apparatus according to claim 9,a plurality of the image forming means,wherein a process speed at the low speed mode is half of a process speed at the normal speed mode. 11. An image forming apparatus according to claim 1,wherein said apparatus comprises a plurality of image forming units, and images formed by each of the image forming units are transferred to a common transfer medium conveyed by the conveying medium. 12. An image forming apparatus comprising:an image forming unit adapted to form an image;an intermediate transferring medium to which an image formed by the image forming unit is transferred;a driving unit adapted to drive the intermediate transferring medium at a multiple speed mode;a detector adapted to detect a traveling speed of the intermediate transferring medium; anda controller adapted to control a driving condition of the driving unit based on a detection result obtained by the detector,wherein the controller determines, based on a detection result at a first speed mode among the multiple speed mode, a driving condition for a second speed mode which is different from the first speed mode. 13. An image forming apparatus according to claim 12,wherein the driving unit includes a driving roller for driving the intermediate transferring medium, and a motor for rotating the driving roller. 14. An image forming apparatus according to claim 12,wherein the detector includes a sensor for outputting a pulse signal in synchronization with the rotation of a roller. 15. An image forming apparatus according to claim 14,wherein the detector includes a determination unit adapted to obtain a predetermined number of the pulse signals output fro m the sensor, and to measure intervals for the pulses to detect the traveling speed of the intermediate transferring medium. 16. An image forming apparatus according to claim 15,wherein the controller repeats a control process based on the driving condition determined by the determination unit, by a predetermined number of times. 17. An image forming apparatus according to claim 14,wherein the roller is a driven roller which is rotated in synchronization with the traveling of the conveying medium. 18. An image forming apparatus according to claim 12, wherein the detector is an optical sensor. 19. An image forming apparatus according to claim 12, wherein after the driving condition is determined, the driving condition is maintained during image forming in the second speed mode. 20. An image forming apparatus according to claim 12,wherein the multiple speed mode comprises a normal speed mode and a low speed mode which is lower speed than the normal speed mode, andwherein the controller determines a driving condition for the low speed based on the detection result at the normal speed mode. 21. An image forming apparatus according to claim 20, wherein the process speed at the low speed mode is half of a process speed at the normal speed mode. 22. An image forming apparatus according to claim 12,wherein said apparatus comprises a plurality of the image forming units, and images formed by image forming units are transferred to the intermediate transferring medium, and the images on the intermediate transferring medium transferred to a transfer medium. 23. A control method for an image forming apparatus which drives a conveying medium for conveying a transfer medium to which an image formed by an image forming unit is transferred at a multiple speed mode, the method comprising:a detection step of detecting a conveying speed of the conveying medium; anda control step of controlling a driving condition of the conveying medium based on a detection result in the detection step,wherein in the control step, based on a detection result at a first speed mode among the multiple speed mode, a driving condition for a second speed mode which is different from the first speed mode is determined. 24. A control method for an image forming apparatus which drives an intermediate transferring medium to which an image formed by an image forming unit is transferred at a multiple speed mode, the method comprising:a detection step of detecting a traveling speed of the intermediate transferring medium; anda control step of controlling a driving condition of a conveying medium based on detection results in the detection step,wherein in the control step, based on a detection result at a first speed mode among the multiple speed mode, a driving condition for a second speed mode which is different from the first speed mode is determined.
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이 특허에 인용된 특허 (2)
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