Patent GB-732661-A (GB)
Title: Photographic copying camera
Inventor: GELB HERBERT
IPC: G03B27/32
Filed: 1951-11-20
Abstract: 732,661. Photographic cameras. GELB, J., [trading as GELB CO., J.]. Nov. 20, 1951, No. 27210/51. Class 98 (1). A photographic copying apparatus comprises a stand having a beam resiliently mounted thereon by shock-absorbing members secured to the stand; several cross members adjustably mounted on the beam; two parallel series of pillar blocks adjustably mounted on the cross members with a block of each series supported by each cross member and the blocks of one series aligned with the blocks of the other series; a pair of rails, one rail being supported by all blocks of one series and the other rail being supported by all blocks of the other series; two carriages movably mounted on the rails; a lens board on one carriage; a copy board on the other carriage; and stationary supports for holders for plates or films and for half-tone screens located behind the lens board, said supports and the lens board being interconnected by a bellows. The apparatus shown comprises six columns, three such as 10, 12 and 14 on each side. Each'of the rear pairs of columns 10, 12 carries a plate 17 with six resilient supports 19 mounted thereon and supporting transverse channel members 26, 27. Each front column 14 also carries a plate 24 with resilient supports 19 for a transverse channel member 30. Rigidly secured to the channel members 27, 30 and extending along the length of the apparatus are two parallel channel members 31, 32, these members being interconnected at intervals by ties 33 in the form of castings. Spaced pairs of lugs, such as 34, 36, Fig. 2, on the members 31, 32 adjustably support cross members 37 to the extremities of each which parallel rails 38, 39 are attached. Each cross member 37 also carries pillar blocks 40, 41 on which are secured rails 42, 43. Suspended from rails 42, 43 by brackets carrying wheels, such as 48, 50, movable along the rails is a frame 45 carrying the lens board which is connected by bellows 133 to the rear of the apparatus. Another frame 53, which supports the copy board, is similarly mounted on the rails 42, 43. Journalled in the channel members 27, 30 are a screw shaft 64 and a shaft 67 which is threaded only at its front end. Screw 64 passes through a tapped hole in frame 45 and the threaded part of shaft 67 engages a tapped hole in frame 53. Shafts 64, 67 are respectively operated by electric motors 80, 79 which are connected thereto by chain drives. Also connected to the shaft of each motor by a chain drive is a calibrated dial for indicating at the rear of the apparatus the extent of movement of the frames 45, 53. Each shaft 64, 67 is also connected by chain drive to a handwheel 109, 103 whereby the frames may be moved manually. The columns 12 and 14 and the corresponding columns on the opposite side of the apparatus also support standards, such as 111, 120, Fig. 2, these standards supporting beams 118 which extend along the length of the apparatus. Secured to each beam is a C-shaped channel member (e.g. 124), the inner surfaces of the flanges of which serve as traction rails along which run trolleys 127, 128 interconnected by a beam 129. Each end of this beam has suspended therefrom a bar 130 carrying an arc floodlight and linked at 170 to the copy board frame 53. A housing 102 for the holders of photographic plates or film and half-tone screens is also provided at the rear of the apparatus.