Patent GB-105012-A (GB)
Title: Improvements in or relating to Photographic Apparatus.
Inventor: MELLERSH-JACKSON WILLIAM JOHN
IPC: G03F7/22
Filed: 1916-08-15
Abstract: 105,012. Jackson, W. J. Mellersh-, (Huebner-Bleistein Patents Co.). Aug. 15, 1916. Enlarging, copying, and reducing.-In a photographic copying- apparatus comprising a relatively adjustable subject-holder and camera, the subject-holder consists of a hollow or box-like franie and is rotatable about a vertical axis so as to bring subjects to be copied, which are supported on its different sides, into position in front of the camera; the holder for the sensitive plate or surface is adjustable in predetermined steps in its plane, and fine adjustments movable into or out of operative position are provided for controlling the relative positions of the subject-holder and camera. As shown in Fig. 8, the subject-holder G had four sides each provided with upper and lower horizontal bars g<3>, g<4>, carrying movable clamps h<9>, which engage the edges of the subjects G' to be copied. The bars g<3>, g<4> are each secured to one run of endless chains h passing over chain-wheels h<1>, and are simultaneously adjustable vertically by handles which turn the lower chain-wheels. euds of the bars g<3>, g<4> are pressed into engagement with the edges Eccentric rollers on axles near the of the angle-iron corner posts g to prevent longitudinal movement of the bars. The subject-holder is mounted on a carriage H, which travels on a spring-supported rail track D and is rotatable about a hollow pivot i secured to the carriage and housing a spring i<1> which supports an antifriction bearing i<2>. A lamp L in a casing l<3> having a front l<7> of ground glass may be provided within the subjectholder to illuminate transparencies that are to be copied, the casing being adjustable on rods l<5> carried by a frame t secured by a post l<1> and sleeve l<2> to the carriage H. The position of the carriage H on the track D may be adjusted by means of a handoperated pinion k' and a rack f<2> between the track rails, and also by means of a fine-adjustment gearing located adjacent to the holder for the sensitive surface and operating through an endless chain connected to the carriage. The gearing comprises a worm-wheel k<6>, Fig. 6, which may be engaged by a worm k<7> on a shaft journaled eccentrically in a rotatable bushing, the bushing being turned to put the worm and wormwheel into or out of engagement. Similar means for adjusting the support C for the camera front are provided. The sensitive plate is carried by slips m<7> adjustable on horizontal bars m, m<1>, the bars being vertically adjustable in a frame M. which is also vertically adjustable in an horizontally shdable carriage N. The frame M and carriage N may be adjusted in steps of predetermined length through racks o<1>, u<3> and pinions o, u<2> by mechanisms such as that shown in Fig. 20. The shaft of the pinion o carries a worm-wheel p engaged by a worm p<1> on a shaft P operated by a handle p<3>. The shaft P turns within an externally threaded fixed sleeve q and may be secured by means of a flange s carrying a screw-operated toothed block to a toothed flange s<1> on a hollow shaft R, the shafts P and R then turning together. The shaft R has a longitudinal slot q<11>, into which projects a lug q<10> on an internally threaded stop q<7>, the stop q<7> travelling on the sleeve q, when the shaft P is turned. between a fixed stop g<2>, and an adjustable stop on the right hand end of the sleeve q, these stops limiting its motion and consenuently the movement of the rack n'. When the stop q<7 >comes into engagement with the adjustable stop. it may be returned to its initial position in engagement with the stop q<2> by unscrewing the block S and rotating the shaft R in the reverse direction by another handle through bevel-wheels r<3> and toothed wheels r<1>, r. The block S may then be again screwed on to the flange s<1> and the handle p<3> turned to move the frame M through another step. Indicators may be provided to show in inches and minute fractions the adjustments of the several adjustable parts of the apparatus. A half-tone, mezzo, or other screen W, Fig. D. may be carried by vertically adjustable horizontal hars w in a frame W<1>, which may he adjusted horizontally in its plane on guide-bars w<4>, w<5> capable of being adjusted to or from the sensitive plate. The frame W<1> may be removed from between the guide-bars by sliding it horizontally. The spring supports for the rail track D may comprise a rook-shaft e<3> having arms e<6> bearing on spring e<7> and arms e<2> carrying a shaft e<1> passing through bearings e secured to the track.