Patent GB-191409884-A (GB)
Title: Apparatus for the Production of Stereotype Plates.
IPC: B41D1/00
Filed: 1914-04-21
Granted: 1915-07-01
Abstract: 9884. Maschinenfabrik Augsburg Nurnberg Akt. - Ges. April 21. 1913, [Convention date]. Stereotype; printing-surfaces.-In a machine for casting and finishing stereotype plates, the casting core is employed in the finishing operations, being provided for this purpose with a boring-tool which operates after the core has rotated to carry the cast plate past a milling- cutter for removing the dead head and into a supporting-shell. As shown in Figs. 3, 5, and 6, the core 1 is fitted with a boring-bar 10 and is intermittently driven through a ratchetwheel 37 fixed thereto, by a pawl 36 whose engagement is controlled by levers 31, 34 from a cam 27 on a shaft 28 and which is carried by a worm-wheel 26 driven through gearing and a shaft 22 from an electric motor 19. The case or mould 3 is movable radially of the core 1 and supports the matrix 8 secured by holders 9 and arranged to provide a greater annular space at the upper part 5 than below. The molten metal is supplied through a pipe fitted with a valve automatically controlled from an eccentric on the driving-gear, and after the plate has cooled, the case 3 is drawn back automatically and the core rotates to carry the plate past milling-cutters 11, driven from a separate motor 13, and into a shell 18 against a fixed stop 17, whereby it is held while the continued rotation of the core shaves it by the cutter-bar 10. The core comes to rest in casting position, and the finished plate is left supported on a counterweighted platform 92 which descends to permit of removal of the plate in the direction of the arrow 93. The case is moved towards and away from the core by a crank 55 engaging a slot 57 on the case and driven by gearing 53, 52, 48 from a shaft 28, which is driven intermittently from the shaft 22 through worm and spur gear 44, 43, 41, 40, 39. This intermittent drive is effected by the engagement of a pawl 45 on the loose worm-wheel 44 engaging a ratchet-wheel 46 fixed on the shaft 28, on the end of which is also fixed a cam 47 driving through a spring pawl 49 the wheel 48, the drive being arrested when the mould is closed by a sliding link 59 moved into the path of an arm 62 on the pawl 49 so as to disengage it. The link 59 is reciprocated by a crank-pin on a wheel 66 driven from the shaft 28, and is moved to release the spring pawl 49, after the cast plate has solidified, and allow the driving-gear to open the mould. The matrix holders 9 are given a first movement radially outwards in detaching the matrix, and for this purpose they are arranged to slide on lower rails 70 projecting from the shell 18 and on angle brackets 71 slidably supported by plates 73 secured to the case. The angle brackets 71 have projections 79 extending into the path of notched levers 80 pivoted to the shell 18, and guides 78 fixed to the case project through slots in the angle brackets 71 and holders 9. On withdrawing the case, the guides 78 move in the slots in the angle brackets and holders which are held by lugs 82 on the levers 80, and the projecting bent parts 84 of the guides effect an outward movement of the holders 9 and separate the matrix. On further movement of the case, pins 85 engage bevel projections 86 on the levers 80 and raise them to disengage the lugs 82 from the angle brackets and holders, which then move with the case. The holders 9 may be moved by rack and pinion gear 88, 89 from a hand-lever 87 for insertion of a new matrix. These holders themselves form a closure for the mould. In a modification, the case remains stationary and the core, after the cast plate has become solid, is moved laterally to bring the plate into a supporting- shell prior to shaving by the rotation of the core.