| 摘要 |
<p>This invention relates to an improved mechanism for driving the print head of a printer and is particularly adapted for bidirectionally driving the print head of a wire matrix printer. The mechanism includes a bi-directional motor, preferably a DC motor, which is coupled to the print head. When a print operation is to be performed, the motor is started running in a first direction, causing the print head to move across a print line in a first direction. A first detector is provided for detecting when the print head reaches a predetermined point of a print line when being driven in the first direction, the motor being energized in response to an output from the first detector for reversing its direction of energization for a period of time at least sufficient to overcome the inertia of the print head in the first direction and for substantially stopping the print head. For the preferred embodiment, the motor continues running in its reverse direction to drive the head in its opposite direction, with a second detector being provided to detect the print head reaching a predetermined point on the print line when being driven in the opposite direction. The motor is energized in response to an output from the second detector to again run in the first direction for a period of time at least sufficient to substantially stop the print head.</p> |
