SWITCHABLE FILM-MOVEMENT PROJECTION SYSTEM Russian patent published in 2003 - IPC

FIELD: cinematography. SUBSTANCE: film-pulling mechanism moving cine film including series of frames with images and having aggregate of perforation holes on edges of cine film incorporates sprocket roller, feeding and retaining rollers, first electric motor, one end of output shaft of it being linked to retaining roller and second end being joined to synchronizing discs placed between proper pairs " light source- photocell ", second electric motor, one end of output shaft of it being linked to jump roller and second end being connected to positioning discs placed between proper pairs " light source-photocell " and electron controller ensuring change of rotational speed of retaining and jump rollers and positioning of jump sprocket roller with change of film size expressed in number of perforated holes embraced by each frame in film. Frames of cine film are centered anew with reference to frame window of projector each time size of cine film changes. EFFECT: ensured movement of cine film carrying assemblage of various sizes without interruption or delay in operation of projector. 17 cl, 13 dwg