| 摘要 |
PURPOSE:To prevent a large impact from inflicting on a film and a feed mechanism by mistake, by generating a pulse corresponding to a rotating quantity of a feed reel and a moving extent of the film, and detecting a set terminal of the film. CONSTITUTION:A pulse Ra corresponding to a rotating quantity is generated by the slit 10a of an encoder plate 12 on the revolving shaft 10 of a feed reel 1, and a pulse Rd corresponding to the moving extent of a film 2 is generated by an encoder plate 16 on the revolving shaft of an upper roller 6 of a pair of idle rollers. The two pulses are inputted to a computer, a film terminal state and an optional set terminal state of a little before said state are detected from a specified relation of the two pulses, and the film feed is switched to a high speed running and a low speed while the set terminal state and while the actual terminal state from said state, respectively. Accordingly, the film reaches the terminal in a high speed state, and it can be prevented that a large impact works on the film and the feed mechanism. |
