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    OFF-THE-CARRIER RIBBON FEED AND DRIVE ON A HIGH SPEED MOVABLE-CARRIER IMPACT PRINTER
    5.
    发明专利
    OFF-THE-CARRIER RIBBON FEED AND DRIVE ON A HIGH SPEED MOVABLE-CARRIER IMPACT PRINTER 未知

    公开(公告)号：CA1122149A

    公开(公告)日：1982-04-20

    申请号：CA343630

    申请日：1980-01-14

    Applicant: IBM

    Inventor： MATHEWS RAYMOND D

    IPC: B41J32/00 ,  B41J33/16 ,  B41J33/22 ,  B41J33/40 ,  B41J33/14

    Abstract: OFF-THE-CARRIER RIBBON FEED AND DRIVE ON A HIGH SPEED MOVABLE-CARRIER IMPACT PRINTER In order to maintain constant tension on a relatively long expanse of ribbon stretched along the carrier path in impact printer apparatus having off-the-carrier ribbon drive and feed, apparatus is provided for driving a first and a second reel in forward and reverse directions, each reel being adapted to support a portion of an inventory of a ribbon web running along said carrier path from one of said reels to the other at a constant speed differential between the portion of the web being taken up on one of the reels and the portion of the web being supplied on the other of said reels irrespective of the drive direction which comprises a first inelastic drive belt for peripherally nonslip driving the web portion on the first reel and a second inelastic drive belt for peripherally non-slip driving the web portion on the second reel. A first drive means provided for selectively engaging and driving the first and second belts in the forward direction wherein the first reel takes up the ribbon; in this case, the second drive belt is driven at a speed slower than the first drive belt wherein the ribbon between the reels is maintained under a constant strain. Second drive means to provide for selectively engaging and driving the first and second belts in the reverse direction wherein the second reel takes up the web; the first drive belt in this case is driven at a speed slower than the second belt whereby the ribbon between the reels is also maintained under a constant strain. AT9-78-037

    ENCODER FOR MONITORING BIDIRECTIONAL MOTION
    6.
    发明专利
    ENCODER FOR MONITORING BIDIRECTIONAL MOTION 未知

    公开(公告)号：CA1138926A

    公开(公告)日：1983-01-04

    申请号：CA349753

    申请日：1980-04-14

    Applicant: IBM

    Inventor： BENGNER LUTZ H O ,  KEE WALLACE E ,  MATHEWS RAYMOND D ,  OLSON STEPHEN T

    IPC: G01D5/36 ,  G05D3/12 ,  H02K37/00 ,  H02P8/00 ,  H02P8/20 ,  H02P8/38

    Abstract: ENCODER FOR MONITORING BIDIRECTIONAL MOTION An encoder is provided for monitoring bidirectional motion, particularly bidirectional rotation in a closed loop step motor system. The present disclosure involves a rotational encoder having a plurality of indicia at fixed positions with respect to each other, means for rotating said indicia about an axis and means for sensing the indicia positioned along the path of rotation of said indicia. In the present apparatus, each of a plurality of said indicia has a first edge radial to said axis and traversing the path of rotation and a second edge nonradial to the axis also traversing the path of rotation and the apparatus further includes means for moving the sensing means so that the position of the sensing means may be adjusted with respect to the first edges which are the leading edges when said indicia are rotated in one direction and to the second edges which are the leading edges when the indicia are rotated in the opposite direction. The means for moving the sensing means include means for moving said sensing means radial to said axis in order to vary the position of the sensing means with respect to the second edges and means for moving the sensing means in an arc concentric with the path of rotation in order to vary the position of the sensing means with respect to the first edges. AT9-78-025

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