Printing mechanism for a typewriter or office machine of similar design

摘要

The frequent change to foreign languages with different characters or to different type faces with specific formulae requires easy exchangeability of the daisywheel (8) in printing mechanisms in typewriters or similar office machines. The daisywheel (8) is fitted onto the free end of a drive shaft, it being possible for the daisywheel (8) to be coupled to the wheel receiver (15) via a carrier pin (21). The engagement of said carrier pin (21) in an engagement opening (23) in the daisywheel (8) takes place only in their common flush position, which is achieved by means of a search run of the wheel receiver (15). According to the invention, this engagement is simplified by the fact that the daisywheel (8) is blocked by a blocking member during the search run movement. According to the invention, the blocking member is a control rocker (27) which is mounted pivotably on the printing mechanism carriage (6), can be disengaged from its catch position by means of a holding member (29) which can be pivoted by means of and during the pivoting of the pivoting bearing (28) into the operating position, and can be brought by a blocking lug (26) into the range of action of a stop (25) on the rotating daisywheel (8) in such a way that the carrier pin (21) engages securely in the engagement opening (23) to be carried along in rotation while the daisywheel (8) is blocked and then blocks the drive motor (9) of the daisywheel (5). After blocking of the drive motor (9), a control device (30) then emits drive pulses to a drive motor (31) for the printing mechanism carriage (6) in such a way that the... Original abstract incomplete. <IMAGE>