Patent GB-650806-A (GB)
Title: Improvements in stereotype plate casting and finishing machines
IPC: B41D3/00
Filed: 1945-09-26
Abstract: 650,806. Stereotype plate casting. WOOD NEWSPAPER MACHINERY CORPORATION. Sept. 26, 1945, No. 34785/47. Convention date, Dec. 29, 1944. Divided out of 650,752. [Class 100 (ii)] A stereotype plate travelling from a casting-box down an inclined runway, is stopped at an intermediate position where a tail is severed from the plate and is lifted and moved laterally off the runway out of the path of the plate. The machine described includes casting-apparatus and cooling-apparatus forming the subject-matter of Specifications 650,752 and 650,807, respectively. The inclined runway is formed by rollers 151, 156, Fig. 3, down which the plate slides to a finishing unit. Each side edge of the plate passes over a serrated roller, the speed of which is controlled to retard the plate by mechanism forming the subject-matter of Specification 650,807. Finishing-unit.-After leaving the rollers 156, the plate moves on to rollers 188 and slides down to rising and falling stops 158. The plate is then raised by the rollers into an arched member 194 in which it is held for the finishing operations. The rollers at the right side, Fig. 5, are mounted in a slide 274 raised and lowered by gear segments 272 which are fixed on a shaft 271 and engage rack teeth 273 on the slide, and the rollers at the left side are mounted in a slide 300 raised by crank-arms 303 on a shaft 302, the arms being connected by links 304 to a cross-bar 305 slidable on rods 306 and acting on the slide 300 through springs 309. To avoid rubbing the edges of the plate against the edges of the arch, the edges are pinched inwardly by bars 280, 313 carried by arms 279, 311 pivoted to the slides 274, 300 and moved inwardly by cams 290, 322, respectively, as the slides are raised. The cams release the bars when the plate is positioned in the arch and act on the bars again when the plate is being lowered after finishing. The shafts 271, 302 are rocked against spring action by cams fixed to a bar 195 carrying a shaving knife 235, Fig. 9, adjustably secured by bolts 237 to a bar 195, Fig. 3, rotated from a motordriven shaft 201 through worm gearing 204, 205, 207, 208 and a shear-pin 212; the shavings fall into a receptacle 240. The drive-motor is started on the return of the core to vertical position, for casting a plate, by a switch, Fig. 20 (not shown), closed by a cam on one of the corecarrying arms whereupon a limit switch closed by a cam rigid with the worm 208 maintains the circuit open until the knife bar has completed a revolution. The knife bar 235 is mounted in bearings 106, 107 adjustable laterally by means of screws and as to height by shims. Severing and transporting the tail.-A tail T on the plate is severed by a rotary saw 218, Fig. 3, which is mounted centrally in the bar 195. A tool 234, Fig. 9, for cutting a bevel on the end of the plate is fixed to the bar 195 by a clamping-plate 238. A second bevelling-tool 251 radially adjustable in a bracket 253 secured by bolts 257 to the bar 195 is adjustable longitudinally of the bar 195, whereby the plates are trimmed to a constant length. The severed tail T is picked up and carried to the broken-line position, Fig. 16, to be dropped on to a truck, by means of hooks 372 mounted on brackets 370 supported at 368, 369 by parallel arms 362, 365 pivotally mounted on shafts 359, 366, and connected by links 367. The arms are operated from the shaft 195 by a crank 341, rods 343, levers 345, 350 and a rod 353 connected to the shaft 359. The hooks 372 are pivoted at 371 to the brackets 370 and are rigid with arms 374 connected by links 375 with a lever 376 fixed to a pivot shaft 377 on which is a torsion spring acting to close the hooks on to the tail. A screw 382 on an extension 380 of one of the arms 374 engages a pin to release the hooks to discharge the tail, the hooks being held in that position by a pawl engaging a latch fixed to the shaft 377 to avoid damage to the hooks rubbing over the next tail. A pin on an arm fixed to the pivot 369 releases the pawl. A grid forms a guard over the lifting-mechanism.