Patent GB-549152-A (GB)
Title: Improvements in or relating to a photographic camera
IPC: G03B17/42
Filed: 1941-05-05
Abstract: 549,152. Photographic cameras. KODAK, Ltd. (Eastman Kodak Co.). May 5, 1941, No. 5855. [Class 98 (i)] In a photographic camera having a lens iris diaphragm shutter of the type which is tensioned by a setting-lever and released by a trigger which makes a to and fro idling movement during setting, and which returns to its normal operable position after each release operation, a release member on the camera body is held against movement by latch means disposed between it and the shutter trigger, which means are released automatically through connections operated in the to and fro movement of the trigger. In the construction shown the release member is held against operation until both the shutter has been set and the film wound on. The release member or button 9 on the camera body engages when depressed a lug 20 on a lever 11 pivoted at 17, the rocking movement of the lever causing it to depress a forked member 22 secured to the upper end of a sleeve 12 which is thereby forced downwardly over a supporting post 24 against a spring 33. A link 29, pivoted to lugs 27, 28 respectively on the sleeve 12 and on a sleeve 13 slidably carried on a post 26 on the camera front, transmits the downward movement to the sleeve 13, thereby causing an arm 15 carried by it and formed with a U-shaped end 32 engaging a pin 16 on the shutter trigger 8 to operate the trigger to release the shutter. The pivot 30 for the lower end of the link 29 operates in a curved slot 35 in the latter, allowing relative movement between them when the camera front is moved into the body. Until the shutter has been set movement of the lever 11, and hence depression of the release button 9, is prevented by an abutment 36 on the end of a latch lever 37 which lies beneath the lug 20 on the lever 11. During setting of the shutter the trigger 8 moves downwardly, causing a downward movement of both sleeves 13, 12, the latter carrying with it the member 23 which engages an inclined cam 40 on the latch lever 37, so rocking the latter until the abutment 36 is free of the lug 20, Fig. 3. The lever 37 is retained in this position by a latch 46 pivoted on its end, which snaps over a lug 51. Unless, however, the film has been wound on, a pin 52 secured to the abutment 36 still lies beneath the lug 20 and prevents operation of the release button. When the film is wound, it rotates a shaft 55 carrying a film measuring wheel, this shaft rotating a gear 57 until a pin 59 on it engages an arm 60 extending from a pawl 61, which is thus rocked until it engages a ratchet wheel 63 on the film-winding spindle and prevents further winding. Simultaneously, another arm 64 of the pawl engages an extension 65 of the latch lever 37 and moves the lever to the left, Fig. 3, thus removing the pin 52 from beneath the lug 20. When the lever 11 is depressed by the button 9 to release the shutter the lug 20 engages the latch 46 and releases it ; at the same time the other end of the lever, which is forked and underlies the pawl 61, moves the pawl axially on its pivot against the action of a spring, thus freeing it from the pin 69 so that it returns to the position shown in Fig. 4. The latch bar 37, thus freed from the restraint of the latch 46 and arm 64 of the pawl, is returned by a spring 41 to the position shown in Fig. 4, in which operation of the release button 9 is again prevented until both the shutter has been set and the film wound on. The shutter may be constructed as described in Specification 491,885.