| 摘要 |
PURPOSE:To enable the advance and retraction of a printing head to be effected easily and accurately, by a construction wherein a driving motor for advance and retraction of a head holder for a printing head is fitted on a carriage on which the holder is mounted so that it can advance toward and retract away from a platen roller disposed opposite to the holder. CONSTITUTION:A small-type motor M is provided on the carriage 1a. With the motor M rotated, an eccentric cam 10 is turned through a shaft 11, whereby a roller 8 is rotated to cause the head holder 1b to advance relatively to the carriage 1a against a tension spring 12, so that the printing head 4 fixed to the holder 1b is brought closer to a printing paper 5 fitted on the platen roller 6. A printing operation is conducted while reciprocating the carriage 1a along a guide shaft 3 by a driving wire 7. After the printing operation is finished, the motor M is deenergized in the condition wherein the carriage 1a is located at a predetermined position, and the head holder 1b is returned to its initial position by the action of the spring 12. |
