Patent GB-784558-A (GB)
Title: Improvements in or relating to apparatus for the pressing of bent laminated assemblies
IPC: B32B17/10
Filed: 1955-09-30
Abstract: 784,558. Laminating - apparatus. PITTSBURGH PLATE GLASS CO. Sept. 30, 1955 [Dec. 22, 1954], No. 27869/55. Class 140. [Also in Group XXXVIII] An apparatus for pressing bent laminated assemblies such as two matched sheets of curved glass and a thermoplastic interlayer comprises a pair of spaced supporting members separately mounted for horizontal and vertical movement relative to a fixed housing, a roll housing rotatably mounted on the pair of supporting members and a pair of driven, yieldable opposing rolls on mountings for frictional engagement against opposite surfaces of the assemblies. A bent glass assembly with bent end upwards and the longitudinal axis parallel to the direction of travel, after passing through a furnace, is passed by a conveyer through two inflatable presser rolls 68, 69 rotatably mounted in plates 66, 67 supported by trunnions 57, 58 in bearings in supporting members 42, 43 in movable members having side and top members 17, 18 supported from hangers 30, 31 connected to pistons 26, 27 of cylinders 24, 25 for vertical movement over supports 20. Each supporting member 42, 43 is connected at the bottom to a cylinder 35 also connected to a movable member for horizontal movement by rollers 45 moving over guide tracks 40 on the movable members. The roll 69 is frictionally driven by a roll 77 driven by a motor 65. A further pair of rollers contact the roller. The upper roll 68 has three contacting rollers 93 one of which is driven from the lower roll 69 which also drives a sprocket 101 on a shaft 102 extending into a program housing 106. The shaft is connected by sprockets and chain to a sprocket 132 on a shaft 124 extending from trunnion 57. The sprocket is freely rotatable on the shaft and has integral one member 143 of a magnetic clutch, the other part 144 of which is secured to a sleeve connected to the trunnion 57. A cable 117 is wound on the sleeve and is connected to the piston 118 of a cylinder 120 which when operated rotates the rolls to the correct position to receive the glass assembly. The shaft 124 carries four program cams 148 and two other cams 149, 150. Cam followers 157 on levers 153 contact the cams and are connected to differential transformers 151. Two transformers are provided for vertical movement and two for horizontal movement of the rollers 68, 69. Each has a movable armature 155 connected to a lever 153. Cam 149 actuates the air cylinder 120 by a switch 160. Cam 150 engages a switch 161 to disengage the magnetic clutch. A trip starting mechanism comprises a plate 208 supported from a shaft 210 mounted on upright members 14 and having at one end a dog 221 engageable with a dog 222 on a stub shaft 217 having an arm 219 which rests on a switch 220. When shaft 210 is rotated by the feed of the glass assembly the arm is lifted from the switch to actuate a timer for glass alignment assembly 260, air cylinder 120 and magnetic clutch 143, 144 as well as the motor 65 if desired. A solenoid-operated latch 228, 229 is also provided to prevent oscillation of plate 208 one part being mounted on shaft 210. Secured to hanger 30 is a cable 204 passing over pulley 185 on member 13. The shaft of the pulley has a cam 184 in contact with a follower pin 189 on a needle 190 connected to the armature of feed-back differential transformer 198. Cable 204 is connected to a weight 205 moving within a container 206. Movement of the armature returns the rolls to their original position after vertical movement. Similarly the original position is restored after horizontal movement by rotation of a cam 168 operating a feed-back differential transformer on a movable frame. A feed in conveyer for the glass assembly comprises rollers 231 supported by a pair of driven chains. A glass aligning mounting plate is bolted to a side rail 246, a piston-rod extends through the plate to an alignment bar 272 the movement of which by the piston is limited by nuts and sleeves on two guide bars. A discharge conveyer 280 is similar without the alignment device. Attached to opposite supports 14 are two containers for control assemblies having a servo valve and an electronic amplifier. Fig. 10 shows one circuit for vertical movement and control of one end frame. Feed-back differential transformer 198 and program differential transformer 151 are connected in voltage opposition. A servomotor 289 has a differential transformer 290 which has two primary coils P connected in series, two secondary coils S1, S2 connected in opposition and an armature. Primary coils are connected to 64 output of transformer 293. Potentiometer 295 is connected to the primary coil of transformer 290 to vary the sensitivity of the servomotor. Secondary coils are connected to the input 296 of amplifier 294. The output is connected to a reversible two-phase servomotor 298. Motor 298 and transformer 293 are connected to 110 v. A.C. source. Armature 155 is moved by cam follower 157 contacting cam 148. Armature 197 is moved by cam follower 189 on cam 184. Cylinder 24 for controlling vertical movement of movable members 17, 18 has oil supply lines 300, 301 connected to a four-way valve 302. Piston 306 of the valve is connected to eccentric 308 on a shaft rotated by motor 298, the piston is also connected to the armature 314 of transformer 290. The circuit is operated by the glass assembly contacting the trip starter 208 when cams 148 rotate on shaft 124 to move armature 155 and cause unbalance in the circuits, whereby the ends of the rollers are caused to move in predetermined manner to anticipate the twist of the glass along its longitudinal axis. The profiles of the cams are predetermined according to the shape of the glass assembly to be pressed.