PRINTWHEEL HOMING APPARATUS
    5.
    发明专利

    公开(公告)号:CA1155962A

    公开(公告)日:1983-10-25

    申请号:CA366018

    申请日:1980-12-03

    Applicant: IBM

    Abstract: PRINTWHEEL HOMING APPARATUS In a printwheel type of printer using a selection stepper motor for driving the printwheel, means are provided for performing printwheel homing operation upon occurrence of predetermined events. Such an event, is detected and reported to microprocessor means which drive motion means for bringing the printer carriage assembly to a first extreme left position where a stop element fixed relative to the printwheel rotation is made to enter the path of another stop element attached to rotate with the printwheel. Subsequently, the selection stepper motor driving the printwheel is driven for a number of steps at least equal to one motor revolution to ensure reaching inhibition of the printwheel rotation by bringing the rotating stop element into contact with the relatively fixed stop element. The carriage is then moved back to the left margin writing position where the relatively fixed stop element is withdrawn from the path of the other stop element and the angular printwheel home position is noted and stored by the microprocessor means. LE9-79-004

    RIBBON FEED FOR A TYPEWRITER
    9.
    发明专利

    公开(公告)号:AU530347B2

    公开(公告)日:1983-07-14

    申请号:AU6215180

    申请日:1980-09-09

    Applicant: IBM

    Abstract: In a daisy wheel or rotary print wheel typewriter, a single motor is employed to accomplish both ribbon lift and feed for typewriter ribbon and correction ribbon loaded in a cartridge assembly. A single motor drive moves the cartridge assembly support about an axis to present the typewriter ribbon or the correction ribbon to the print point at the print line. When the elevation of the cartridge assembly about the axis is such to permit normal typing upon the typewriter ribbon, only the feed ratchet for the ribbon is engaged. Alternatively, when the rotation is greater, for example, for typing on the correction ribbon, the added elevation of the cartridge assembly effects disengagement of the normal ratchet feed for the typewriter ribbon while allowing advancement of the correction ribbon.

    TYPE ELEMENT SUPPORT
    10.
    发明专利

    公开(公告)号:CA969499A

    公开(公告)日:1975-06-17

    申请号:CA154492

    申请日:1972-10-17

    Applicant: IBM

    Abstract: Clearance take-up bias is added to the support structure for a rotatable type element to minimize variations in effective impact force previously induced by the existence of varied amounts of slippage and parts flexure that wasted a portion of the available impact energy.

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