| 摘要 |
FIELD: photography. SUBSTANCE: the device has a casing, adjusting drum secured on it, cylinder cam aligned with the adjusting drum, stepped cylinder cam and a brake latch. From the known devices it differs by the fact that it uses an additional cylinder cam coupled with the casing and adjusting drum, as well as a spring-loaded plate secured on the casing, as well as a spring-loaded plate secured on the casing for turning about its own axis and engagement with the stepped cylinder cam by its flanging. Besides, the device is furnished with an anchor pair, whose escape wheel is installed on a shaft, has a toothed and cylindrical surface, and is furnished with a mainspring. The pair anchor secured on the casing is engageable with the toothed surface of the escape wheel, whose cylindrical surface has a shoulder that is engageable with the side surface of the spring-loaded plate. The escape wheel is installed for axial displacement by means of the additional cylinder cam, turning about the axis through the introduced pin pair, and engagement with the roller of the post secured on the brake latch through the rollers secured on its lower end face. EFFECT: enhanced operating capabilities due to the increase of the range of developed exposures. |
