| 摘要 |
A printer such as a thermal printer includes a reversible motor, a paper feed driver angularly movable through a desired angle in response to operation of the motor, a paper feeder rotatable for feeding a sheet of paper, and an electromagnetic clutch operatively connected between the paper feed driver and the rotatable paper feeder. The electromagnetic clutch comprises a first yoke, a second yoke disposed in confronting relation to the first yoke normally in spaced relation thereto, and an exciting coil wound around one of the first and second yokes, the first yoke being coupled to the paper feed driver, the second yoke being coupled to the rotatable paper feeder, the arrangement being such that when the paper feed driver is turned in a direction to feed the sheet of paper, the exciting coil is energized to attract the first and second yokes magnetically to each other for thereby causing the paper feed driver to rotate the rotatable paper feeder to feed the sheet of paper through the electromagnetic clutch.
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