公开(公告)号：US3728685A

公开(公告)日：1973-04-17

申请号：US3728685D

申请日：1970-12-21

Applicant: SAAB SCANIA AB

Inventor： STALNERT J

IPC: G03B21/10 ,  G03B21/11 ,  G03B23/12 ,  G06F15/00 ,  G06K17/00 ,  G11B15/48

CPC classification number: G06K17/0016 ,  G03B21/10 ,  G03B21/11 ,  G03B21/113 ,  G03B23/12 ,  G06F15/00 ,  G06K17/00

Abstract: For lengthwise transit of a film strip from one frame at a fixed station, to bring any other selected frame thereto, a counter is charged with the initial number of frames that must pass the station. A pulse is produced as each frame passes the station, to count down the counter. The pulses are also integrated to produce a true strip speed signal. With the use of the charge on the counter, a demand value signal is produced, corresponding to a constant fast velocity for all frames that must pass the station in excess of a predetermined number, and therebelow, to a decreasing velocity proportional to number of frames still to pass. The strip drive is energized according to the difference between true and demand values, in a manner tending to maintain that difference at zero.

Abstract translation: 对于在固定站的一帧中的胶片条的纵向传送，为了将任何其它所选帧提供给计数器，必须通过该台站的初始帧数。 每个帧通过电台产生一个脉冲，倒计数器。 脉冲也被集成以产生真实的带速度信号。 通过使用计数器上的电荷，产生一个需求值信号，对应于必须通过电台超过预定数量的所有帧的恒定快速速度，并且下降到与帧数成比例的减小速度 还要通过 根据真实值和需求值之间的差异，条带驱动器以使得该差异维持在零的方式被激励。