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    Ink-ribbon feeding and reversing assembly
    2.
    发明授权
    Ink-ribbon feeding and reversing assembly 失效
    墨盒送料和反向装配

    公开(公告)号：US3584723A

    公开(公告)日：1971-06-15

    申请号：US3584723D

    申请日：1968-09-25

    申请人： SCM CORP

    发明人： ANDERSON HILDING A

    IPC分类号： B41J33/518 ,  B41J33/44

    CPC分类号： B41J33/518

    摘要： There is disclosed an ink-ribbon feeding and reversing assembly with a pair of ratchet wheels and a respective pair of drive pawls. The rachet wheels drive respective ribbon carriers. The ribbon is driven in one direction when one of the pawls is in driving engagement with one rachet wheel, the other pawl being held out of driving engagement with the other ratchet wheel. An electric motor continuously drives a drive shaft through a clutch. The drive shaft carries a pair of eccentrics which are directly connected to the pair of pawls. An eyelet at each end of the ribbon actuates an associated sensing lever. When either one of the sensing levers is actuated it operates a respective interposer. Each pawl drives an actuator. When either interposer is moved into the path of its respective actuator, a reversing control device is operated to switch the direction of ribbon feed. The reversing control device includes a tubular control shaft received by the drive shaft. Control members, interconnected by the control shaft, enable engagement of one drive pawl and one detent pawl with one ratchet wheel and hold the other drive pawl and another detent pawl out of engagement with the other ratchet wheel.