| 摘要 |
A daisy wheel printer wherein a non-contacting sensor (24) is employed to detect the rotational position of the daisy wheel (10) by response to the interrupting action of the character stalks (12, 14) and to produce a train of pulses providing positional information in accordance with said interrupting action. In accordance with the invention, each stalk of the daisy wheel is divided by a longitudinal slit (26) into two or more branches (28, 20) thereby to increase the frequency of the interrupting action and, for a given rotation of the wheel, to cause the sensor to produce a train of pulses (32) containing a number of pulses which is an integral multiple of the number of stalks passing the sensor.
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