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1. 发明授权

US4089490A Film transport mechanism 失效
标题翻译：电影传输机制
公开(公告)号：US4089490A
公开(公告)日：1978-05-16
申请号：US592786
申请日：1975-07-02
申请人： Roberto Quintanar , Sergio Quintanar , Alexandro Quintanar , Delbert K. Matthews
发明人： Roberto Quintanar , Sergio Quintanar , Alexandro Quintanar , Delbert K. Matthews
IPC分类号： G03B21/43 , G03B1/04 , G03B1/54
CPC分类号： G03B21/43
摘要： A film transport mechanism for use in conjunction with a motion picture projector is a free standing unit carrying supply and takeup reels and associated drive motors. The arbors for the supply and takeup reels are generally parallel, and positioned therebetween is a free running sprocket assembly. Film direction rollers cause film from the supply reel to run over one side of the sprocket and additional rollers to direct the return film from a projector over the opposite side of the sprocket whereby the rate of film advance to the projector and return are equal. The transport mechanism transfers a major portion of the torque required to pull film off the supply reel from the projector to the transport thereby significantly reducing the tension on the film going to and from the projector. The entire assembly includes a support structure having a vertical column supporting the motors, arbors and the control electronics, and constitutes a conduit for virtually all electrical interconnections. Control circuitry controls the takeup motor as a function of film movement between the sprocket and the takeup reel and energizes both rewind and takeup motors during the rewind cycle. The speed on rewind is controlled by the control circuitry by controlling the current to the normal run takeup motor. Failsafe circuitry prevents unintended shutoff during restart situations, but turns off the transport mechanism after a few seconds in case of a film break or runout.
摘要翻译：与电影投影仪结合使用的胶片传送机构是承载供纸卷取卷轴和相关联的驱动马达的独立式单元。用于供应和收紧卷轴的轴心大致平行，并且位于它们之间是自由行进的链轮组件。电影方向辊使得供应卷轴的胶片从链轮的一侧延伸出来，另外的辊子将返回胶片从投影机引导到链轮的相对侧，由此胶卷进入投影机并返回的速度相等。传送机构传送将胶片从投影机拉出的所需扭矩的大部分转移到传送装置上，从而显着地减少了去往和来自投影仪的胶片上的张力。整个组件包括支撑结构，其具有支撑电动机，轴和控制电子装置的垂直列，并且构成用于几乎所有电互连的导管。控制电路控制卷取电机作为在链轮和卷取卷轴之间的胶片移动的功能，并且在倒带循环期间对倒带和卷绕电机进行激励。控制电路通过控制正常运行电机的电流来控制倒带速度。故障安全电路可以防止在重启情况下无意中关闭，但在断电或跳动的情况下几秒钟后，请关闭传输机构。

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