摘要:
Speed fluctuations at a motor supplied with a two-phase current is reduced by changing the current value ratio at each phase in the drive current to feed a drive motor for an image reader to allow a light source lamp to move, free from speed fluctuations, to scan at a constant scanning speed. The drive motor is supplied with current different in value at each phase from constant current drive circuits, which, in one embodiment, are connected with current regulating variable resistors. An acceleration detector is fixed at the drive motor to detect acceleration fluctuations in rotation of the drive motor to detect speed fluctuations. In some embodiments, thermal control of the motor drive circuit is provided and vibration proofing to isolate the light receptor from the drive motor.
摘要:
A vibration attenuating mechanism and method is disclosed for the purpose of maintaining a high quality of image reading or writing while scanning a document with an image processing device which includes a carriage that supports an optical scanning element, a motor which drives the optical scanning element so as to scan a document for either reading or writing data, and a housing which supports the optical scanning element and the motor. At least one of a weight or a vibration absorbing material is provided nearby the motor so as to reduce vibrations which are transferred from the motor to the optical scanning element. In this way, the quality of image reading is maintained despite the recent trend toward increased scanning speeds.
摘要:
A conveyor belt having a reinforcing layer of a synthetic fiber woven fabric embedded between an upper surface cover and a lower surface cover, wherein an elongation at break of the synthetic fiber woven fabric in a belt longitudinal direction is at least 25% and an elongation at a load 10% of a guarantee strength is not greater than 1.5%.