公开(公告)号：US4150886A

公开(公告)日：1979-04-24

申请号：US717879

申请日：1976-08-26

申请人： Stephen L. Merkel ,  Charles B. Small ,  Barton F. Norton

发明人： Stephen L. Merkel ,  Charles B. Small ,  Barton F. Norton

IPC分类号： G03B21/00 ,  G03B1/54 ,  G03B21/43 ,  G03B21/48 ,  G03B1/00

CPC分类号： G03B21/43 ,  G03B21/48

摘要： A projector for motion picture film includes a servo motor which is controlled to advance film frame by frame to a projection station. A capstan on each side of the projection station is controlled to maintain film loops of substantially constant size and an associated reel motor delivers film to and takes film from each capstan. Each associated capstan and reel motor are controlled so as to maintain substantially constant tension on the film. A film guide defines the projection station and also includes provision for masking peripheral areas of each frame. Each capstan and an associated pinch roller are designed so as to eliminate creeping of film from between the two. A circuit for controlling the reel motors is arranged to permit fast winding of film directly from one reel to the other with an automatic braking feature.

摘要翻译： 一种用于电影胶片的投影仪包括伺服电动机，该伺服电动机被控制以逐帧地将电影推进到投影站。 控制投影站两侧的绞盘以维持基本上恒定的胶片回路，并且相关联的卷轴电机将胶片输送到每个绞盘上并从每个绞盘上取出胶卷。 每个关联的绞盘和卷轴电动机被控制以便在膜上保持基本上恒定的张力。 胶片导板定义了投影台，并且还包括用于掩蔽每帧的周边区域的设置。 每个绞盘和相关的夹送辊被设计成消除两者之间的膜的蠕变。 用于控制卷轴电机的电路被布置成允许用自动制动特征将膜直接从一个卷轴快速卷绕到另一个卷轴。

公开(公告)号：US4079633A

公开(公告)日：1978-03-21

申请号：US718831

申请日：1976-08-30

申请人： Sarabjit Singh Cheema ,  Charles B. Small ,  Barton F. Norton

发明人： Sarabjit Singh Cheema ,  Charles B. Small ,  Barton F. Norton

IPC分类号： G03B1/18 ,  B29C39/02 ,  B29C70/36 ,  B29C70/88 ,  B29D29/00 ,  B29D29/08 ,  B41J11/26 ,  B65G23/16 ,  B65H20/20 ,  F16G1/28 ,  G03B1/24 ,  F16H7/00 ,  G03B1/30

CPC分类号： B65G23/16 ,  B29C39/026 ,  B29C39/028 ,  B29C70/36 ,  B29C70/887 ,  B29D29/00 ,  B29D29/085 ,  F16G1/28 ,  G03B1/24

摘要： A tractor belt adapted to be trained over and driven and supported by sprockets in a mechanism for advancing and positioning a strip of material having hole-in-line perforations, the belt comprising a wire-cored band having perforation engaging lugs integral with and projecting from one surface of the band and sprocket engaging lugs integral with and projecting from the opposite surface of the band. A method for making such a belt.

摘要翻译： 一种适于在用于推进和定位具有孔内穿孔的材料条的机构中由链轮训练和驱动和支撑的拖拉机带，该带包括具有穿孔接合突起的导线接合突起， 带和链轮的一个表面接合突起与带的相对表面成一体并且从带的相对表面突出。 制造这种带的方法。