Patent GB-650752-A (GB)
Title: Improvements in stereotype plate-making machine
IPC: B41D5/00
Filed: 1945-09-26
Abstract: 650,752. Stereotype plate casting. WOOD NEWSPAPER MACHINERY CORPORATION. Sept. 26, 1945, No. 24979. Convention date, Dec. 29, 1944. [Class 100 (ii)] A vertical mould for a stereotypeplate casting-machine comprises a casting-box and a core retractable in opposite directions, the core being tilted to an inclined position on retraction and the box being prevented from closing when the core is in its tilted position. The machine shown comprises a casting-unit 1, Fig. 1, a finishing-unit 2 and a cooling-unit 3, the units 1, 2 resting on the floor and the unit 3 being attached to and supported by the unit 2 ; to facilitate manufacture and shipping, the machine may be divided along the lines 4, 5. The mould comprises a casting- box 12 and a core 28, Figs. 2 and 5. The box has rollers 18 engaging horizontal tracks 20, 22, and rollers 24 riding between tracks 26, 27, the rollers 24 being eccentrically mounted whereby the box may be tilted to bring it square with the core ; the box may be adjusted laterally by means of screw-operated wedges. The box is moved to and from casting position by turning a crank-shaft 36 adapted to operate rods 33 connected to the box at 34 ; by rotating worms 43 engaging worm-wheels 42 fixed to crank-pins 35 the latter may be adjusted to set the box at the correct distance from the core 28. The core has centrally-placed bevelled wheels 49 riding on bevelled edges of the tracks 27 and has handles 50 whereby it may be tilted to the inclined position shown to discharge a cast plate C. Rods 51 each connected to the core at 52 and to a stud 54 guide the core in its movement ; by turning the studs 54, the initial position of the core may be adjusted. To prevent movement of the box when the core is in the tilted position, a sliding rod 59 is provided adapted to be moved into the path of a cam 58 fixed to the shaft 54. The box and core are locked together when in casting position by bell cranks 92 rocked from the box 12 and provided with slots 98 engaging pins 99 on the core 28 ; the pins 99 engage inclined surfaces on the machine frame to guide the core to its correct lateral position. When in casting position, the core rests on a half segment 66 supported on a ring 65 rocked about pivots 64 by means of a treadle 80 and rod 75. The treadle is pressed at the same time as the core is tilted whereby the core-support moves with the core part of the way. The pivots 64 are carried by vertically-adjustable brackets 62, and the ring 65 is further adjustable vertically by adjusting screw stops 70. A recess 68 is formed in the segment 66 to form a bevelled edge in the plate for clamping the plate on the machine. The cast plate is broken away from the core by rollers 82 on brackets 81 slidably mounted on the core, an extension 86 of the bracket engaging an adjustable stop 88 when the core reaches the tilted position. Each side of a matrix M is clamped against a bar 103, Figs. 11 and 12, by a clip 108 slidably mounted on the bar by pins 109 and inclined slots 110 and actuated by turning a handle 119 to rotate a bracket 115 carrying an eccentric pin 114 to which is secured a rod 111 connected at 113 to the clip 108 ; wedges 121 adjustably fixed to each clip form stops limiting the movement of the clip. Each bar 103 is pivotally mounted in the casting box 12 by means of pins 104, 105 and is turned into the position shown in Fig. 12, where it is separated slightly from the box, by turning a cam 130 into the position where a roller 133 on the cam engages a recess 126 in a bracket 125 fixed to the shaft 105. The edge of the matrix is then inserted, the clip is closed and the cam 130 is turned so as to engage a second recess 127 in which position the matrix is pressed against the casting box. The cams 130 are next released from the brackets 125 and are returned to normal position by springs 135, the bars 103 are swung into fully open positions by springs 139 causing the matrix to be flexed, and the mould is closed whereupon cams 143 on the core engage toes 128 projections 145 on which engage projections 146 on the brackets 125 so as to rotate the bars 103 to fully-closed positions. Filling-in pieces on 'the edges of the core, and screws 148, Fig. 2, press against the clips to provide a leak-proof mould. Projections 149 on the cams 130 engage projections 150 on the toes 128 to prevent movement of the cams into engagement with the brackets 125 while the mould is closed. The rollers 82, Fig. 5, and rollers 151 adjustable toward and from the centre of the machine to suit the width of the plate and mounted in a bracket adjustable up and down, form an inclined runway down which the plate travels to the finishing unit. The Specification as open to inspection under Sect. 91 describes also (a) mechanism for retarding the movement of the cast plate to finishing and cooling units ; (b) plate-finishing mechanism, and (c) a plate-cooling unit, now forming the subject-matter of Specifications 650,805, 650,806 and 650,807 respectively. This subject-matter does not appear in the Specification as accepted.