| 摘要 |
PURPOSE:To enable the gap between a printing surface and the tip of a printing head to be automatically adjusted, by a construction wherein a paper thickness detecting member is provided which is brought into contact with a platen when a carriage is oscillated, and a rotary shaft is rotated a predetermined amount through a friction clutch. CONSTITUTION:With a driving motor 16 rotated clockwise by a predetermined amount, the rotary shaft 3 and the carriage 1 are rotated counterclockwise through the friction clutch 8, whereby the paper thickness detecting member 5 is brought into contact with a printing paper 7. At this time, the motor 16 is idly rotated under the action of the clutch 8. Therefore, the thickness of the paper 7 can be detected by the member, even on a change in the paper thickness. When the rotating amount of the motor 16 is previously determined so as to provide an appropriate gap for printing between the printing surface of the paper 7 and the tip of the printing head 24 mounted on the carriage 1, it is possible to maintain a constantly fixed gap irrespectively of variations in the thickness of the paper 7. Then, a solenoid 22 is attracted to increase the frictional force between a gear 11 and a friction member 14, thereby preventing the gap between the printing surface and the tip of the head 24 from being varied. |
