Patent GB-622947-A (GB)
Title: Improvements in tension lock-up pocket casting machinery
IPC: B41D3/00
Filed: 1946-11-07
Abstract: 622,947. Stereotype. WOOD NEWSPAPER MACHINERY CORPORATION. Nov. 7, 1946, No. 33146. Convention date, Dec. 27, 1945. [Class 100 (ii)] Apparatus for casting curved stereotype plates having tension lock-up pockets comprises a casting box and a cylindrical core between which an arcuate mould cavity is formed, a plurality of pocket core members to form pockets on the plate carried by and within the core and movable through openings in the core surface from retracted positions in the core to positions in which they extend in the mould cavity, and rotary means for moving the pocket core members, located within the core and operated by core rotating mechanism or by means for locking the core in the casting box. The cylindrical core 4, Figs. 1 and 2, is mounted round a stationary axle 10 within a semicylindrical box 2, thereby defining a casting space 14, the box being cooled by water supplied to a space 28 by inlet and outlet 30, and the core by water from a pipe 24 passing through a sleeve 26. The core is rotated 180 degrees after casting each plate to bring it into stripping position, by a gear 20 clutched to the core top plate 100. Core member holders 104 are secured to the core 4 by clamps 106, the core members 108 being attached to pins 114 surrounded by packing 118 to prevent seepage. Several core members in vertical alignment are attached to vertical tie-bars 120, and the members are positively projected and retracted by means of pivoted links 122 having ends encircling eccentrics fixed on shafts 126, carried in bearings 136 separate from the core to facilitate interior machining thereof. The shafts 126 are rotated by the rotary motion of the core through 180 degrees by means of a planetary gear system comprising a stationary gear 128 secured to the axle 10, intermediate gears 130 and gears 134. The head 100 is detachable to facilitate assembly of the core member mechanism. In another form, Fig. 7, the core is pivoted out of the box laterally on rollers 146 running on tracks on side frames carrying the casting box. A handle 210 is rotated to bring conventional core-locking bars 204 into locking position, the movement of the handle also actuating a vertical bar 214 and thereby through a crank arm 234 rotating a stub-shaft 230 carrying bevel gears 226 engaging bevel gears on vertical shafts 222, 224, whereby core members 216 are projected by means of racks 218 and gear segments 220. On reverse movement of the handle, the core members are retracted and the core released from the casting box. A matrix 206 is engaged between the locking bars 204 and packing strips 208 and moves out of the box with the stripped plate from which it is manually removed. The Specification as open to inspection under Sect. 91 comprises also a form in which the core members 34, Fig. 3 (Cancelled), are arranged in pairs mounted in holders 36, one pair at each opposite side of the core, and two pairs on the level of each pocket to be formed in the.plate P. The members 34 have edges 35 for forming the pockets and move in arcuate passages 42 in the holders, being moved into their projecting, casting position by levers 52 mounted on studs 56 and urged against stops 68 by torsion springs 58 around the studs and fixed at one end to the levers and at the others to caps fixed over the ends of the studs and adjustable to alter the spring tension, and fixed in an adjusted position by screws passing through an opening in the cap and one of several openings in the holder. The studs have gear segments 70 engaging racks 72, 74 on plungers 76, 78, the plunger 76 being bored to receive a poppet 86 and spring 84. A spring clip 92 over both plungers prevents seepage of water, and the holder has a hole to drain any water entering the unit. Tube members 34 are retracted against the action of the springs 58 by the action of the plate P as the latter is stripped from the core by fingers 94, and return to casting position on release by the plate. Should a member 34 stick in retracted position, it will be forced up on retraction of the other member by the action of the segments 70 and racks 72 and 74, spring 84 and poppet 86, and the plungers 76, 78 abutting against each other. In a further form, Fig. 12 (Cancelled), the core is pivoted out laterally by means of rollers running on tracks on side frames carrying the casting box. The core has a water space 180 and sections 140, 178, to each of which is bolted the holder 158. The core members 166 are moved into casting position by springs 58 assisted by rods 174 abutting against cams on a shaft 192 which is rotated on pivotal movement of the core by means of levers 152 pivoted to the frame and carrying a bevel gear engaging a gear 194 on the shaft. The members 166 are retracted by the stripping movement of the plate. A packing 188 and adjustable nut 187 is provided to prevent seepage. This subjectmatter does not appear in the Specification as accepted.