GB722443A - Improvements in photographic and x-ray apparatus - Google Patents

Abstract

722,443. Photographic cameras; X-ray apparatus. SERIX, [formerly MIESCH & CIE.]. March 31, 1952 [April 6, 1951; Nov. 28, 1951], No. 8134/52. Class 98 (1). A roll-film photographic camera or radiographic apparatus has a locking device which allows the supply spool to rotate only when it is accurately positioned axially. As shown in Fig. 1, in X-ray apparatus roll-film 3 is fed from a supply spool 17 over a driving roller 15, between a fixed plate 2 and a movable plate 4, and over a second driving roller 16 to a take-up spool 22. The film is driven by a roller 8, rotatable as by a handle 10 or an electric motor and connected by a belt or chain 11 to a roller 7. A roller 9, movable between rollers 7, 8, is normally disengaged but on rotation of roller 7 is urged by a cam 12 thereon into driving contact with roller 8, thus driving rollers 15, 16 to move the film through belts 13, 14, and driving take-up spool 22 through a belt 23 and a slipping clutch. A cam 6 on roller 7 urges plate 4 against plate 2 to hold the film flat between them during the period when roller 9 is disengaged from the film drive. The supply spool lock, Fig. 5, comprises a rotatable sleeve 34 carrying slidable rods 36 with prolonged shanks 37, the heads 38 of which are normally urged by springs into a recess 43. The heads 38 and recess 43 are non-circular and complementary in shape so that sleeve 34 is prevented from rotating. When, however, the supply spool 17 is inserted in the apparatus the stepped end of its spindle (shown in broken lines) engages rods 36 so that heads 38 are pushed out of recess 43 into a recess 44 large enough to allow rotation. The presser plate 4 is carried by linkages 5 provided with springs, may be coated with luminescent material, and may be interchangeable with other plates. It may also have vertical members 30, Fig. 3, connected thereto by cross-bars 31 and springs 32. When the plate is advanced members 30 first engage the edges of the film, the springs yielding as the plate advances to press the whole exposure area. Pressure rollers 49 hold the film against the driving rollers 15, 16. The film is fed over a guiding roller 24 to the take-up spool 22 in a compartment 26, which may be closed by flexible metal screens 50 and removed after the exposed film has been wound on. When a backing paper 3 is supplied with the film, it is fed by its own route to the take-up spool. When the exposed film is not spooled, a trap 25 supporting the guiding roller 24 is raised and a cutter blade 27, operated by a link 28 connected to roller 7, cuts off exposed lengths of film which fall into cornpartment 26. In an alternative embodiment the pressure plate is carried by pivoted arms rooked by cams, a removable oscillatory film cutter is used, and a Geneva mechanism winds the film.