| 摘要 |
PURPOSE:To simplify a mechanism by dispensing with the cam for a wobbler eccentric, by operating the wobbler eccentric for performing a minute amount of lift by using the change in the rotary angle of a lift cam being a main lift mechanism as a signal. CONSTITUTION:When a cam shaft 11 is driven by a stepping motor and a ribbon lift cam 10 is revolved, a ribbon is lifted at a fundamental truck position. When the ribbon lift cam 10 is rotated by 240 deg., the projection pat 50 of the cam 10 pushes a wobbler lever 51 which is, in turn, revolved around a shaft 52 to push a wobbler eccentric 16. At this time, the pawl 51a on the upper surface of the lever 51 is engaged with the groove 55a of a holding member 55 and the ribbon is lifted at a shifted truck position. When the cam 10 is further rotated, the pawl 51a is engaged with the separated groove 55b of the holding member 55 and the ribbon is lifted at a further shifted position. When the cam 10 further rotates and there is no groove corresponding to the pawl 51a, the engagement of the lever 51 and the wobbler eccentric 16 is released and the ribbon is returned to a home position. |
