Patent GB-233518-A (GB)
Title: Improvements in molding presses
IPC: B29C43/02
Filed: 1924-05-12
Abstract: 233,518. Golby, F. W., (Brunswick-Balke- Collender Co.). May 12, 1924. Stationary-mould machines; heating and cooling moulds.-A machine for moulding phonograph records &c. comprises a platen hinged to the bed and capable of being locked in its closed position, a second platen raised and lowered by hydraulic means to effect the pressing operation, and means for effecting automatically a continuous series of operations, such series being terminable at will by the operative. The lower platen 17, Fig. 1, is carried by an hydraulic plunger 16. The upper platen 27 is mounted on a shaft 26 supported in bearings 25 carried by brackets 20 mounted on a flange 19 on the fixed cylinder casting 13. The platen 27, Fig. 13, is raised and lowered by the operation of sliding racks 46 engaging segmental gears 45 on the shaft 26. The platen is locked in its lower position by a series of bars 37 carried by a sliding frame 38 and adapted to engage a series of undercut lugs 40 on the brackets, 20. The frame 38 is moved by a rack 43 engaging a segmental gear 44 on the shaft 26. The upward movement of the racks 46 first moves the frame 38 backwards until the bars 37 leave the lugs 40 and abut against parts 36<a> secured to the platen, further movement of the racks 46 causes the platen to swing with the shaft 26 in its bearings 25. Reverse movement of the racks first causes the platen to swing into operative position and second the bars 37 to engage the lugs 40. The machine is driven from a shaft 60, Fig. I, which may serve a number of machines. This shaft carries a sprocket wheel 71 on a sleeve 70, Fig. 3, which can be clutched to the shaft by the movement of a clutch part 68. The clutch is moved against the action of a spring 80 bv a rod 79 operated by a cam finger 88 on a vertical rod 85 turned by a handle. The clutch, when closed, is locked by a projection 90 on a rod 91 engaging behind a lug 92 on the plate 93 secured to the rod 79 and carrying the parts which move the clutch. The rod 91 is rotated by arms 95 connected by rods 97 controlled by springs 104 and connected to arms 100 pivoted on the shaft 26. The arms are connected by a rod 106. The springs 104 tend to cause the engagement of the projection 90 and lug 92. When looked, the clutch can be released by the operative by the depression of the rod 106. The spring 80 will then open the clutch. The sprocket 71 is geared by a chain 74 to a sprocket 75 on a shaft 73. The shaft 73, Fig. 6, carries a sleeve 113 and worm driving a shaft 54 carrying a crank 53 which is connected through a rod 49 and cross-head 48 with the racks 46. The shaft 73 also carries a gear driving a shaft 151, which is geared to a shaft 128. The shaft 128 carries a plate 127 with cam projections 130 adapted at intervals to engage an arm 125 on a shaft 120 and rotate the shaft to close a clutch 111, 112 to drive the sleeve 113. The shaft 54 carries a. locking-disc 134 with undercut notches 135 which are engaged by a lever 131 centred on the shaft 120 and controlled by a spring surrounding a vertical pin 141. The cam 130 operates the shaft 120 to close the clutch and release the lever 131 from the notch 135. The shaft 54 rotates and the engagement of the lever 131 with the surface of the disc 134 keeps the clutch closed until the next notch comes into position. The lever 113 then moves in, locks the disc, and opens the clutch. The shaft 128 also carries a number of cams 160 - - 163 which control the valves admitting fluid to the hydraulic press, and heating and cooling fluids to the moulds carried by the platens. Each cam comprises a split hub 195, Fig. 14, whereby it can be attached to the shaft, and a slot 200 in the cam plate wherein can be adjusted a dwell plate 201 to adjust the timing of the cam. The plate is secured by bolts 204. The shock of the impact of the bars 37 on the brackets 20 when the platen 27 is closed is taken up by springs 208. Arms 28 on the platen are connected to a bracket 205 carrying rods 206 which slide through a bracket 207 supported by a pair of pivoted rods 210. The springs are situated between the bracket 207 and washers 208<a> at the ends of the rods 206. The shock of the blow of the bars 37 engaging the lugs 40 is taken up by a spring 222 surrounding a rod 220 secured to the frame. 38. The spring is situated between a washer at the end of the rod and a cylinder head 215 secured in a bracket 216. The operation of the machine is automatic, the platen 27 being raised a sufficient length of time to allow the operative to remove the finished record and to insert the material for the next record.