公开(公告)号：US3704941A

公开(公告)日：1972-12-05

申请号：US3704941D

申请日：1970-12-17

申请人： AGFA GEVAERT AG

发明人： WINKLER ALFRED ,  ZANNER JOHANN ,  FISCHERN BERNHARD V ,  FUCHSLE KLAUS

IPC分类号： G03B21/44 ,  G03B1/00 ,  G03B1/56 ,  G03B21/43 ,  G03B21/50

CPC分类号： G03B1/56 ,  G03B21/43

摘要： A motion picture projector for use with film wherein the light transmissivity of the leading and trailing film portions is less than the light transmissivity of the median or main film portion. The film is scanned by one or more photoelectric receivers which produce signals in response to detection of the main film portion while the film is moved forwardly whereby such signals cause the film transporting mechanism to reduce the speed of forward transport of the film to normal speed. The receiver or receivers can also produce signals in response to detection of the trailing film portion whereby such signals initiate automatic reversal in the direction of film transport so that the film is collected by the supply reel. The signals which are produced in response to detection of the main film portion can also cause the claw pulldown to begin with stepwise transport of film past the gate, a shutter to permit entry of light into the projection lens system, a film threading mechanism to move away from the supply reel, a pressure plate to move against the film, and/or a deflecting mechanism for the tip of the leading film portion to assume an inoperative position. Signals which are produced in response to detection of the trailing portion of the film can further cause a shutter to move between the lens system and the light source, to automatically arrest the rewinding drive with a desired delay, and/or to open the circuit of the light source.

摘要翻译： 一种用于胶片的电影投影仪，其中前片和后片部分的透光率小于中膜或主胶片部分的透光率。 当薄膜向前移动时，由一个或多个光电接收器扫描响应于主膜部分的检测而产生信号的光电接收器，由此这种信号使得胶片传送机构将胶片的正向传送速度降低到正常速度。 接收器或接收器还可以响应于后膜部分的检测而产生信号，由此这种信号在胶片传送的方向上启动自动反转，使得胶片由供带盘收集。 响应于主膜部分的检测而产生的信号也可以使得爪下拉开始于逐步传送膜通过栅极，快门以允许光进入投影透镜系统，膜穿线机构 远离供带盘，抵靠膜的压板和/或用于使前片膜部分的尖端的偏转机构处于不工作位置。 响应于膜的尾部的检测而产生的信号可进一步使快门在透镜系统和光源之间移动，以便以期望的延迟自动地阻止倒带驱动器，和/或打开电路 光源。

公开(公告)号：US3690751A

公开(公告)日：1972-09-12

申请号：US9956970

申请日：1970-12-18

申请人： AGFA GEVAERT AG

发明人： FISCHERN BERNHARD VON ,  WINKLER ALFRED ,  FUCHSLE KLAUS ,  ZANNER JOHANN JR ,  UNGNADNER PETER

IPC分类号： G03B21/44 ,  G03B1/00 ,  G03B21/00 ,  G03B21/02 ,  G03B21/32 ,  G03B21/43 ,  G03B1/58 ,  G03B21/52

CPC分类号： G03B21/323 ,  G03B21/02 ,  G03B21/43

摘要： A motion picture projector for use with magazines containing stacks of cassettes for motion picture film. The housing of the projector supports two coaxial takeup reels one of which assumes a collecting position and collects the film which is being withdrawn from a cassette in a projection position while the other takeup reel assumes a withdrawing position and pays out the film whose presentation is completed and which is being returned to the corresponding cassette. The takeup reels are caused to change positions in response to detection of the trailing portion of the film which is being presented, and such change in positions of the takeup reels take place simultaneously with a stepwise advance of the magazine so as to place a fresh cassette into the projection position while the preceding cassette assumes a position in which a rewinding mechanism rewinds onto its supply reel that film which is stored on the core of the takeup reel occupying the withdrawing position.

摘要翻译： 一种用于包含用于电影胶片的盒子的盒子的电影放映机。 投影机的外壳支撑两个同轴卷取卷轴，其中一个卷取卷轴呈现收集位置，并收集在投影位置从纸盒中取出的胶片，而另一个收纸卷轴呈现退出位置，并支付出现完成的胶片 并且被返回到相应的盒式磁带。 使卷取卷轴响应于检测到正在呈现的胶片的后部部分而改变位置，并且卷取卷轴的位置的这种改变与盒的逐步前进同时进行，以便放置新的盒 进入投影位置，而前一个盒子呈现一个重绕机构在其供应卷轴上回收存储在卷绕卷轴的卷芯上的胶片占据退回位置的位置。