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    • 8. 发明授权
    • Electrically conductive ribbon break detector for printers
    • 用于打印机的导电色带断线检测器
    • US4375339A
    • 1983-03-01
    • US211886
    • 1980-12-01
    • Stanley DyerJames J. MolloyDonald A. Walker
    • Stanley DyerJames J. MolloyDonald A. Walker
    • B41J35/36
    • B41J35/36
    • A ribbon feed failure in a printer can cause serious problems, particularly for a printer that uses heat to cause selective ink transfers. Localized heat buildup may injure the printhead and, if allowed to continue, might injure other printer instrumentalities.According to the invention, it is recognized that for ribbons having a degree of electrical conductivity, a mechanical ribbon failure will almost always result in a detectable change of electrical properties. By monitoring the characteristics of an electrical circuit passing through a section of the ribbon around the print point and, preferably, also the printhead-ribbon interface, abnormal electrical parameter values that indicate ribbon failure may be detected to trigger a cessation of printer operation.For a presently preferred implementation in a printer that uses a printhead with multiple electrodes for supplying current to a ribbon, the electrode voltage levels for a plurality of non-adjacent electrodes are combined to provide a resultant voltage level that is examined to detect abnormalities. By so combining voltages, insignificant excursions in electrical characteristics as might result from minor ribbon imperfections are generally eliminated from the triggering of a shutdown response, while still retaining a rapid response for preventing further heat generation in those situations where a serious ribbon failure has occurred.
    • 打印机中的色带供纸故障可能会导致严重的问题,特别是对于使用热量的打印机进行选择性墨水传输。 局部发热可能会损坏打印头,如果允许继续打印,可能会损坏打印机的其他工具。 根据本发明,应当认识到,对于具有一定程度的导电性的带,机械带故障将几乎总是导致电特性的可检测的变化。 通过监测穿过打印点周围的色带的一部分的电路的特性,并且优选地也可以是打印头 - 色带界面,可以检测指示色带故障的异常电参数值,以触发打印机操作的停止。 对于使用具有多个电极的打印头用于向色带提供电流的打印机中目前优选的实施方案,组合用于多个非相邻电极的电极电压电平,以提供检查以检测异常的合成电压电平。 通过如此组合电压,通常可以从触发关断响应中消除由于较小的带缺陷导致的电特性的微小偏移,同时仍然保持快速响应以防止发生严重色带故障的那些情况下的进一步热产生。