Patent GB-251528-A (GB)
Title: Improvements in or relating to the manufacture of printing plates
IPC: B41D3/00
Filed: 1925-10-20
Abstract: 251,528. Marks, E. C. R., (Wood News paper Machinery Corporation). Oct. 20, 1925. Stereotype, casting and finishing. A cast stereotype is finished by traversing it with a tool prior to removing it from casting-position. The mould consists of a water-jacketed segmental back 21 and core 22, Figs. 9 and 10, the core being carried by a shaft 20 adapted to be rotated from a shaft 10 through the medium of a onerevolution clutch. The core is provided with a pin or ping 36 located substantially diametrically opposite a radial projection 61 carrying a shaving blade 62. The mould is closed at the sides by bevelled bars under which the matrix is inserted, and at one edge by a matrix-bar 25 and a clip 33. The matrix-bar, which is provided with a recess for the reception of the edge of the matrix, is pivoted on a shaft 26 mounted in bearings 27, Fig. 4, on the back 21, and is normally held in open position by a spring 28. The clip 33 is pivoted on a bar 29, Figs. 1, 9, and 10, and is engaged by a spring 30 tending to close it. The matrix-bar is locked in closed position by hooks on spring-pressed levers 65, Fig. 4, engaging the ends thereof, the levers being connected together by rods 67 and a lever 69 so that they move into locking or releasing position simultaneously. A handle 24, Figs. 1 and 2, is provided on the shaft 26 for the purpose of closing the bar 25. At the other edge of the, mould, a pouring-funnel 35, Figs. 9 and 10, having a recess for the reception of the edge of matrix, is provided. The mould is arranged with its axis horizontal, and the edge adjacent the pouring-funnel is located higher than the opposite edge. The funnel is attached to two arms 47 on a shaft 46 rocked by a lever 45 and link 44 from a lever 43 operated by a groove in a cam 40. The cam is mounted on a shaft 38 provided with an operating-handle 37, and the cam-groove is so arranged that on moving the handle from one extreme position to the other the funnel is moved and held away from the back of the mould and then returned. The shaft 38 carries a gear-wheel 39 engaging the links of a chain 49, Fig. 7, which passes over guides 50 and supports a carriage 51 sliding on a track 52 on the back of the mould. Mounted in the carriage are a shaft 53 carrying a saw 60, and two pulley-shafts 54, a belt 56, driven from the shaft 10, passing round the three shafts so that the saw is continuously rotated. When the handle 37 is moved, the saw is traversed across the mould to sever the riser from the cast plate. After the riser has been severed, the shaft 20 carrying the mould core is set in rotation. The clip 33 is lifted, against the action of the spring 30, by the core, but the cast plate is held in position by the matrix-bar 25. The pins 63 cut their way out of the plate and, during the first half of the revolution, the back of the plate is shaved by the blade 62. After the shaving is completed, a cam 77, Fig. 2, on the shaft 20 rocks a lever 79, connected by a link 80 and a bell-crank lever to one of the levers 65, to unlock the matrix-bar which is then lifted by its spring out of engagement with the plate. The pins 63 then engage with the opposite edge of the plate and move it, together with the matrix, to a position from which they can be lifted out of the mould. The core finally comes to rest in position for the next cast.