Patent GB-637743-A (GB)
Title: Improvements in and relating to the adjustment and registration of typographically set formes
IPC: B41F27/00
Filed: 1947-08-07
Abstract: 637,743. Printing-surfaces. FAG AKT.- GES. Aug. 7, 1947, No. 21686. Convention date, April 21, 1944. [Class 100 (ii)] An arrangement for adjusting and placing in register typographically set formes on a base plate 1 outside the printing press comprises a transverse suspended beam 3 raised by spring action into an upper extreme position and capable of displacement on lateral guide rails 5 on the base plate 1, the beam 3 supporting removably and slidably mounted stirrupmembers 6 with straight edges 7 lying at right angles to the beam, the beam being capable of being fixed at different heights for the duration of the necessary setting and adjusting operations. The beam 3 of inverted U-shape is supported at each end in a carriage 4 travelling on rollers 4<SP>1</SP> on the rails 5 and is normally held in the upper extreme position by springs 4a. To adjust the height of the beam for different heights of type, which are adjusted and locked between abutments 2, at each end two set screws 8, fixed by lock-nuts, bear against a wall 9 in the carriage 4 when the beam 3 is lowered. For accurate adjustment of the beam 3 on the rails 5, a sheet metal strip 12 is arranged to lie just above a marking band 10, tensioned by a block 29 and screw nuts 28, on one of the rails 5, the strip 12 being fixed to pins 13 in which are screwed guide pins 14 for accurate adjustment of height, springs 16 being compressed when the beam 3 is lowered so that the strips 12 are firmly pressed against the band 10. A marking band 10<SP>1</SP>, tensioned by a block 29 and screw-nuts 28, is placed on two raised longitudinal edges 25 on the top of the beam 3 for accurately fixing the distance apart of the inner edges of the straight edges 7, the stirrup members 6 being supported on rails 3c so that the top web of the stirrup is above the bands 10<SP>1</SP> and a strip 6b is adjustable vertically by screws 6a to lie only just above the band 10<SP>1</SP>. For accurate registration work in multi-colour printing, a flat transparent plate 32 is rotatably fixed between two stirrup members 6 by journals 34 fitting into bearing eyes 35, a proof sheet of the first forme being printed on the plate 32 which is then used for adjusting the formes for the other colours. The stirrup members 6 and plate 32 may be removed and later returned to the same position, determined by a head on a measuring bar 36 lying in a groove 37 between the edges 25 and having locking pins fixing the bar in the groove, the head having a stop screw adjustable to micrometer markings. The beam 3 can be locked in its travel over the plate 1 by means of set screws 43 in pegs 44 which can be screwed against a shaft 40 extending through the beam 3, the shaft 40 having at each end a pinion 41 engaging a rack 42 on the rails 5. To clamp the beam at its lowest or intermediate positions, at each end a clamping screw 11, turned by a handle 11a, bears against a vertical pin 46 extending in a bore 45 in the wall 9 of the carriage 4. An arrangement is described of a rubber cylinder inside the beam 3 by which a proof sheet may be taken of the adjusted formes.