Patent GB-205556-A (GB)
Title: Apparatus for printing on music sheets, maps and other drawings
IPC: B41C1/08
Filed: 1922-07-17
Abstract: 205,556. Atkinson, C. F. July 17, 1922. Printing processes; platen machines; printing- surfaces.-Apparatus for printing words, signs &c. in any desired position upon a sheet of paper, card, celluloid, glass, wax, gelatine, &c., or on a plate or lithographic stone from which sheet, plate, or stone reproductions of lettered drawings, maps, music, or text-matter may be made, comprises a frame adapted to be secured above the sheet &c. to be printed, and a pressure plate movable vertically within the frame and provided on its underside with means for attaching the printing-type in any position thereto. Fig. 2 shows a construction of apparatus in which the pressure plate is operated electromagnetically. The rectangular frame 1 is secured to a table upon the sheet &c. to be printed, by means of rods 11, Fig. 17, which pass through openings in handle parts 1<a> of the frame and are secured to cramps at the edges of the table. The frame 1 is provided with castors 1<c> carried by rods 1<e> engaged by pivoted handles 1<b> so that when the handles 1<b> are depressed, the frame is lifted from the table and rides on the castors. The pressure plate 2 is guided within the frame 1 on plungers 8, and its downward movement is effected against the action of springs 8<b> on the plunger 8, upon the excitation of solenoids 7 fixed on the frame 1, the armatures 7d of the solenoids being fixed to brackets on the plate 2. An iron plate 3 adapted to be clamped to the lower surface of the pressure plate 2 forms the armature of a number of solenoid coils 2<a> arranged in the plate 2 and is adapted to hold the types or type-boxes magnetically when the coils 2a are energized. The type-holders may be straight or curved, and may comprise an L- shaped iron body 12<b>, Fig. 13, against which the types are held by a spring clip 12<c> having grooves 12<m> to engage ribs 12n on the 'body, or may comprise a body 12, Fig. 10, with a downwardly extending end wall and spring sides 12d, a spring clip 12<a>, Fig. 11, being forced on from the open-end to press the types against the end wall. When the apparatus is in use, the type-holders are arranged in their proper positions on the sheet &c. to be printed and the plate 3 is lowered into contact therewith. The coils 7 are then energized, to bring the plate 2 into contact with the plate 3 to which it is then clamped. Current is then supplied to the coils 2<a> and cut off from the coils 7, allowing the plates 2, 3 and the attached typeboxes to rise. An inking-board is then inserted in the frame and the plate 2 is depressed to ink the types and' again raised. After removal of the inking-board the plate 2 is again lowered to make the impression. Instead of attaching the typeboxes magnetically, the plate 3 may be of wood, and the type-holders may be secured thereto by spikes 12f, Fig. 14. Figs. 4 and 5 show a construction of apparatus in which the pressure plate is operated mechanically. In this construction, the raising of a handle 9<a>, pivoted on the plate 2, actuates, through linkage, a longitudinally movable bar 9<e> having slots g<o> engaging arms 10<b> on shafts 10. As the shafts 10 are rocked, cam arms 10<c> thereon engage beneath projecting parts 1<k> on the frame 1 and force the plate 2 downwards in the frame 1.