- Дата: 21-05-2022, 18:40
The sprocket drum have to be in a position to maneuver freely and rotate backwards when the movie is re-wound and therefore needs to be decoupled from the highest and bottom gear practice. At the highest of a hundred and one is a gear within the practice connecting the film-advance knob to the sprocket drum, that is displaced and so decouples the sprocket drum from the higher gear train, the underside of spindle 101 acts on a disc on spindle 30 sited above gear wheel 26, this is displaced separating the 2 pins 102 and 103 and so freeing the sprocket drum from the lower gear train. Drum 7 carrying the next blind is connected by a short rod to the timing mechanism and arm 10 within the mechanism. When the blind forty four has been fully unwound from the spindle 48 the aperture blind forty three can be further wound on the roller forty five to an adjustable extent forming a slit of predetermined measurement. On rotating the winding knob (sited above pinion 66) and the pinion 66, the blinds of the shutter are wound by rotation of the winding pinion 201 via gear wheel 64, 201 is straight connected to the spindle carrying 45, 49 and 50. After one revolution of the wheel 64, the pin 71 engages the pin 70 on the plate 69. The blinds are additional wound to the extent allowed by the slot 72. Until rotation is stopped by the pin seventy four on the setting disc 73. The purpose of the floating plate 69 is that when set to T or B the wheel 71 needs to rotate more than 360 levels, the slot seventy two allows this further motion.