Patent GB-375713-A (GB)
Title: Improvements in and relating to milling machines for use in connection with printingplates and blocks
IPC: B23C3/00
Filed: 1931-12-29
Abstract: 375,713. Printing-surfaces. GANSKOW, O. E., 24, Kaiser Friedrichstrasse, Buch, Berlin. Dec. 29, 1931, No. 35880. Convention date, Dec. 29, 1930. [Class 100 (ii).] A machine for milling the edges of printing-plates and blocks, such as stereos, electros, &c., has twc cutters, one being stationary tc trim the edges oi the plate and the other being movable by means of adjustable cams to form undercut recesses at one or more places in the edges of the plate for co-operation with legs which support the plate in the composition. The legs do not project beyond the edges of the plate and so do not occupy composition space. The recesses E<1> .. E<6>, Fig. 3, receive the legs H<1>, H<2>, Fig. 2, which secure the plate P adjacent the type B<1>, B<2>, and are formed by a cutter B, Fig. 1, on a lever h pivoted to the machine frame at D and carrying a roller R which co-operates with cams N<1>, N<2> adjustably secured to a scale S on the table W which carries the plate P. Alternatively, the lever h may be replaced by a sliding bar. A stationary cutter A trims the edge of the plate and a gauge 38 is provided in line with the cutting surface of the cutter A to assist in setting up the plate. A recess such as E<5> may be formed deeper than the others to enable the edge X of an oversize plate to rest upon filling material F<2>. In operation, a gauge plate having a rabbeted edge corresponding to the undercut of the recesses is mounted on the table W, Fig. 6, against a straight edge L and the cutters are adjusted so that the cutter A abuts the outer edge of the gauge plate and the cutter B, when its roller R is resting on a cam N<2> as shown, abuts the inner edges of the rabbet. A plate P is then clamped to the table by a bar 6 operated by racks 28d, pinions 28c, shaft 28b, worm gearing 28a, and hand-wheel 28, and the table is traversed by a hand-wheel 29 and screw 30 to cause one edge to be trimmed and the recesses formed according to the adjusted positions of the cams N<1>, N<2> on the scale S. The plate is then turned through 90‹, the cut edge being placed against a fixed upright 9 on the frame and an adjacent edge is cut. Distance pieces 13, 14, 15 are. then inserted between uprights 9, 10 and the adjustable fences 11, 12 and the straight edge L is moved up to the fences and clamped by an eccentric 31. The plate is again clamped on the table with the previously cut edges against the edge L and the remaining sides are cut, after which the plate is placed on top of the edge L, as shown, and the position and depths of the recesses are tested by blocks 22 .. 25 which correspond to the legs H and are adjustable along scale bars 32, 33. The blocks 22, 23 are mounted on spindles movable transversely in brackets 22a, 23a, and are pressed into contact with the plate by springs, gauge marks on the spindles and brackets indicating the correct depth of the recesses. If desired, a piece of waste plate may be cut and tested before the required plate is cut. For machining a plate of oval, circular, or other curved outline, the cutter A is removed, the edge of the plate is set to the gauge 38, and a recess is cut by the cutter B. A small plate having a bevelled edge is then inserted in the recess and placed against the upright 9 and a second recess, spaced 90‹ from the first, is cut, the remaining recesses being cut in a similar manner. ' When testing a plate with a curved outline, a second gauge mark on each bracket 22a, 23a is provided in order to allow for the depth of the bevelled plate. A gauge 26 is provided for testing the thickness of a plate, any deficiencies being made good by packing up on the table with sheets of paper.