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    • 10. 发明授权
    • Electric switch actuated printer ribbon reversing mechanism
    • 电开关致动打印机色带反转机构
    • US3902585A
    • 1975-09-02
    • US35785973
    • 1973-05-07
    • DATA PRODUCTS CORP
    • MOGTADER CHARLES SHAHROKH
    • B41J17/14B41J33/514B41J33/40
    • B41J33/514B41J17/14
    • An impact printer utilizing a ribbon mounted to be drawn past a print station and including means for reversing the direction of ribbon movement. The ribbon is terminally secured to first and second rollers mounted on opposite sides of said print station and of sufficient length to be wound around each of said rollers through many turns. Drive means are provided for selectively driving either the first or second roller. When the first roller is driven, it draws the ribbon from the second roller past the print station. Similarly, when the second roller is driven, it draws the ribbon from the first roller past the print station. The ribbon normally unrolls from the nondriven roller along a path tangential to the circumferential surface thereof. As the ribbon continues to be drawn from the nondriven roller after the last turn has been unrolled, its path changes to substantially perpendicular to a tangent to the roller circumferential surface, i.e., in line with a diameter of the roller. Means mounted adjacent to each of the rollers is able to sense the path change and thereafter reverse the roles of the driven and nondriven rollers to thus reverse the direction of ribbon movement past the print station.
    • 一种冲击式打印机,其利用安装成经过打印站的色带,并包括用于反转色带运动方向的装置。 丝带终端固定到安装在所述打印台的相对侧上的第一和第二滚子,并且具有足够的长度以绕过每个所述滚筒多圈。 提供驱动装置用于选择性地驱动第一或第二辊。 当第一个辊子被驱动时,它从第二个辊子拉出色带通过印刷站。 类似地,当第二辊被驱动时,它从第一辊拉出色带通过印刷台。 丝带通常沿着与其圆周表面相切的路径从非驱动辊展开。 随着丝带在最后一个转动已经展开之后继续从非卷轴辊被拉出,其路径变化为基本上垂直于滚子圆周表面的切线,即与辊的直径一致。 靠近每个辊安装的装置能够感测路径变化,并且此后扭转从动辊和非卷绕辊的作用,从而使带运动通过印刷站的方向反转。