Patent GB-191322524-A (GB)
Title: Improvements in Cameras.
Inventor: BARBERIE JOHN
IPC: G03B19/08
Filed: 1913-10-06
Granted: 1914-02-19
Abstract: 22,524. Barberie, J. Oct. 6. Cameras, roll-film; shutters, roller-blind.- Cameras having pockets for film-rolls are provided with focal-plane shutters, the winding- rolls of which are adapted to be detachably mounted in the pockets, a holder for a plate or film-pack being provided on the removable back, which may also carry the pockets. The pockets 35, 34, Fig. 1, normally occupied by the film-rolls, are fitted with removable segmental sheaths 50, 56 for carrying the winding and restraining mechanism for the focal - plane shutter. The winding or actuating mechanism comprises a roll 46, Fig. 14, having flanges 47 and adapted to rotate on inturned flanges 49 on the segmental sheath 50, a spring 54 being secured to the roll and to a shaft 48 non - rotatably secured to the segmental sheath. The restraining - roll 45, Figs. 6 and 8, has flanges 55, and is rotatably mounted on inturned flanges 58 on the segmental sheath 56, means being provided to release the roll to allow an exposure to be made and to bring it to rest after three or other number of revolutions. An internal projection 66 on the roll 45 normally engages a pin 65 on a sliding sheath 64 mounted on a shaft 63 controlled by the usual winding-key for the film-roll, the sheath being held against rotation in one direction by means of an integral clutch member 75 and a slidable but non-rotary clutch member 73 mounted on an inturned projection 59 on the segmental casing 56. A spring 72 acts on the clutch member 73 to press it into engagement with the member 75 and to move an integral clutch member 67 into engagement with a clutch member 68 secured to the winding shaft 63. The roll is released in any convenient manner by means of a pin 70 carrying a cross-piece 71, moving in a slot in the shaft 63 and adapted to move a casing 69 integral with the sleeve 64 to release the clutch members 67, 68, and to move the pin 66 out of engagement with the pin 65, so that the roll is free to rotate, a pin 78 on a loose collar 76 on the sleeve being brought to the rear of a projection 84 on the roll. The pins 78, 84 come into engagement after the first revolution of the roll, subsequent revolutions of the roll causing rotation of one or more additional loose collars 77 through projections 79, 80, until a pin 81 on the last collar is brought into engagement with a pin 82 on the sleeve 64, the shock on bringing the roll to rest being taken up. by means of the clutch 73, 75. On releasing the pin 70, the spring 72 moves the clutch members 67, 68 into engagement, the loose collars on the sleeve being brought into their normal position, as shown, by means of a light spring 83. On rewinding the shutter, the shaft and sleeve are rotated together, the teeth of the clutch member 75 sliding over those of the member 73. When a focal-plane shutter having a series of slots of different width is employed, an inspection hole 86, Fig. 1, covered by a spring-closed flap 87 may be used. When the shutter is of the type having a variable slit, the restraining-roll is adapted to turn an indefinite number of times, the loose collars and clutch members being omitted. The focalplane shutter mounted on its rolls may be carried in a case apart from the camera. The modifications necessary to adapt the focalplane shutter to various forms of roll - film cameras are described.