| 摘要 |
PURPOSE:To facilitate the revolution control by constituting a shift cam by installing the first groove cam which shifts for a revolution shaft and is set, keeping a height difference, and installing a plurality of grooved cams having the equal dimension and the same shape to the first grooved cam, keeping a phase difference. CONSTITUTION:A shift cam 15 is constituted by installing the first grooved cam 17a which shifts for a rotary shaft 16 and is set, keeping a height difference, and a plurality of grooved cams 17b- having the equal dimension and same shape to the first grooved cam 17a are installed, shifting the phase. When the shift cam 15 is revolved counterclockwise by the drive of a motor 12, a cam follower 18 shifts from the top dead center 17c of the grooved cams 17a, 17b- to the bottom dead center 17d, and the cam follower 18 is shifted from the bottom dead center 17d to the top dead center 17c by the revolution in the reverse direction, and a printing head 6 is transferred in the D or E direction. Therefore, the position of the cam follower 18 can be restricted to either the top dead center or the bottom dead center by the direction of revolution of the shift cam 15, and since the groove cam is formed in opened loop, the need of strictly detecting the position of the cam follower 18 and controlling the motor 12 is avoided.
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