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1. 发明申请

WO1989004768A1 PRINTER WITH PRINTING SHIELD 审中-公开
标题翻译：打印机打印机
公开(公告)号：WO1989004768A1
公开(公告)日：1989-06-01
申请号：PCT/US1988004109
申请日：1988-11-10
申请人： UNISYS CORPORATION
发明人： UNISYS CORPORATION , CHENEST, Gerard
IPC分类号： B41J11/62
CPC分类号： B41J11/62
摘要： A printer is provided with a band (44) attached to the printhead (54) to move to-and-fro across the line of printing, and around rollers (98, 110) allowing it to pass beneath a printing support bed (12) so that introduced documents and documents being printed are restrained from excessive separation from the printing support bed (12). The band (44) is supported in association with the printhead (54) by non-return cylinders (58, 64) capable only of uni-directional rotation. Each cylinder (58, 64) is provided with a rotary spring (76) which takes up any excess length developing in the band (44). Spring loaded rollers (98, 110) at either end of the printing path support the band (44). Electrical indication is provided when one, the other or both of the cylinders (58, 64) cease to take up excess length and when one, the other or both of the spring loaded rollers (98, 110) also cease to take up excess length in the band (44). Operation of the printer is inhibited when any selected one or group of electrical signals indicates exhaustion of tension in the band (44). A signal is provided triggered by intermittent operation of an electrical detector with movement of the head indicating imminent shut-down of the printer or exhaustion of tension.

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