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    2.
    发明专利
    未知

    公开(公告)号：DE1761612A1

    公开(公告)日：1971-07-22

    申请号：DE1761612

    申请日：1968-06-15

    Applicant: IBM

    Inventor： LEELAN GREER DONALD ,  BEARD O'DANIEL JEROME ,  YOSMALI KRIKOR

    IPC: B41J35/14 ,  B41J

    Abstract: 1,213,362. Typewriters. INTERNATIONAL BUSINESS MACHINES CORP. 20 May, 1968 [21 June, 1967], No. 23865/68. Heading B6F. In a typewriter in which a single element type head 1 is pivoted for impression by a cam 11 or 15 acting on a follower 17, the cam selected governs the throw of ink ribbon lift vibrator arms 41, 43. For printing in black, cam 11 is selected and on rotation of a shaft 7, to which a sleeve bearing the cams is keyed, the head 1 is pivoted about an axis 21 for impression, and a cam 37 rotates to lift a foot 47a of a slotted flange 47. A pin 55 located in the slot of the flange 47 engages a ribbon lift arm 41 and as the flange is lifted and pivoted about a pivot 49, the ribbon lift arms are lifted to position the upper, black, half of the ribbon between the head 1 and the platen 3. For printing in red, the follower 17 may be moved automatically, by electromagnetically displacing a pulley 31 around which passes a tape 27 connected to the follower, into engagement with cam 15. During such movement, a camming member 23 is also moved, a camming surface thereon effecting counterclockwise rotation of a rod 61 and thereby movement of the pin 55 away from the pivot 49 through links 51, 57. When the shaft is then rotated, the ribbon lift arms 41 are lifted further by the cam 37 to bring the lower, red half of the ribbon into operative position. The cams 11, 15 may have different conformations to apply different impression forces to the type head 1. Further cams may be provided, such as a nolift cam 13, and further cams to vary the impression force. Printing in red can be selected manually by positioning a rod 59 through a detent arrangement 63 to prevent the pin 55 moving to the black printing position.

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