公开(公告)号：US3860331A

公开(公告)日：1975-01-14

申请号：US45159274

申请日：1974-03-15

Applicant: BOSCH PHOTOKINO GMBH

Inventor： FLECK WERNER ,  WEINBRECHT ERWIN ,  BORNER GERHARD

IPC: G03B1/56 ,  G03B31/02 ,  G03B31/00

CPC classification number: G03B1/56 ,  G03B31/02

Abstract: A sound projector for motion picture film wherein the standard distance between film frames and the corresponding portions of the sound track is maintained during rewinding of film onto the supply reel, even if the film is damaged in the region of several successive perforations. The film which is being withdrawn from the takeup reel engages a sprocket prior to passing around a drum forming part of the sound reproducing unit. The film thereupon reengages the sprocket before it reaches the film gate. Two spring-biased rollers tension the film between the drum and the sprocket. When the motor for the sprocket is operated in reverse, a slide engages and holds the shafts of tensioning rollers in predetermined positions to thus insure that a portion of recorded sound is adjacent to the drum while the corresponding film frame registers with the film gate.

Abstract translation: 一种用于电影胶片的声音投影仪，其中即使胶片在几个连续穿孔的区域中被损坏，胶片框架和声轨的相应部分之间的标准距离也保持在胶卷到供带盘上。 从卷取卷轴取出的胶片在形成声音再现单元的一部分的鼓之前绕过链轮。 这部电影在到达电影门之前重新链接了链轮。 两个弹簧偏置的滚轮在滚筒和链轮之间拉紧薄膜。 当用于链轮的电动机反向操作时，滑块将张紧辊的轴接合并保持在预定位置，从而确保一部分记录的声音与滚筒相邻，同时相应的胶片框架与胶片门对准。