| 摘要 |
A head position controller for a thermal printer which includes a thermal head, a platen, and a carriage which is supported for movement relative to the platen by a motor. The controller includes a head contacting plate, and a motor driven cam which engages the contacting plate to move the thermal head relative to the platen. The cam has a curve which is configured to selectively move the thermal head with respect to the platen from separating to contacting positions, a cam lever having a cam follower which is movable along the cam curve, the lever being connected to the head pressure contacting plate for movement only at a predetermined angle. The controller also includes a heart cam which defines rotation of the cam lever with the cam curve, the heart cam engaging another cam follower which projects from the contacting plate, and an intermittent moving mechanism which transmits intermittent movement to the carriage.
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