Patent GB-849391-A (GB)
Title: Method and apparatus for edge treating
IPC: B24B9/10
Filed: 1958-11-11
Abstract: 849,391. Brushing apparatus. LIBBEY-OWENS-FORD GLASS CO. Nov. 11, 1958 [Nov. 13,1957], No. 36149/58. Class 60. Apparatus for treating the edges of a bent laminated glass sheet A, Fig. 2, comprises conveyer means C, Fig. 4, for moving the sheet along a path substantially transverse to the axis of curvature thereof to a pair of axiallyparallel traction rolls 167, 168 between which the sheet is passed, brushing means 220 engageable with one edge of the sheet as it moves between rolls, means 320<SP>1</SP> positioned to engage the opposite edge of the sheet to maintain the first edge in contact with the brushing means, and means for severing the rolls and brushing means as a unit about a horizontal axis from one side to the other of a vertical plane so as to receive the leading end of the sheet and subsequently discharge the sheet from therebetween. The sheet, which may consist of two layers of glass bonded to an interposed layer of thermoplastic material, such as polyvinyl butyral resin, is passed from a conveyer B to the conveyer C which feeds the sheet to the rolls and pivots upwardly about a shaft 15 at one end to direct the leading end of the sheet between the rolls. One edge of the sheet is abraded with the wire brush 220 as the sheet passes between the rolls and a frame E in which the rolls and brush are mounted at the same time rocks about shafts 126, 127 to guide the sheet onto a take-off conveyer F which pivots downwardly about a shaft 33 as the sheet is deposited thereon. The sheet then passes through a similar arrangement of conveyers and brushing means arranged to treat the opposite edge of the sheet. The conveyers, which are of the endless belt type, frame E and rolls 167, 168 for the apparatus for abrading the first edge of the sheet are driven from a motor 11 driving two shafts 13, 27. The shaft 13 is connected by a chain-drive to the shaft 15 which, in turn, is connected by a chain-drive 17 and magnetic clutch 18 to the shaft 19 of the delivery conveyer B, and by a chain-drive 20 to a magnetic clutch 21 on a shaft 22, on the other end of which is a cam 23. Rotation of the cam displaces a roller 101 on a pivoted arm to actuate a valve 98, Fig. 10, to supply air to one or other of the ends of a cylinder 99 displaceable on guide rails 95 secured to uprights 92, 71 on the base 38 of the machine. The cylinder is connected by a chain 107 running over sprockets 109, 112 to a counterwieght, and the sprocket 112 is keyed to a shaft 76 on which is adjustably secured a second sprocket 78 having one end of a chain 82 secured thereto, the other end of the chain being secured to a bracket 83 associated with the roller 64 of the conveyer which is adjustable to tension the belt 65 ; movement of the cylinder 99 under the control of cam 23 thus raises or lowers one end of the conveyer C. The pivotal movement of the conveyer and a roller 114, Fig. 19, vertically adjustable by means of a pivoted arm 117 guides the sheet upwardly so that its leading end is fed tangentially between the rolls 167, 168 mounted in the frame E consisting of members 122-125, Fig. 4. The rolls consist of spaced discs 170, Fig. 27, of rubber or like material vulcanised to hubs 169 mounted on shafts 175 connected by universal joints 217,218 to shafts 216 driven by gears from a shaft 207 chain driven from shafts 30 and 27. The shaft 207 is rotatably mounted in a hollow shaft 127 which, in turn, is rotatably mounted in a bearing 132 on a:support 134 on the base of the machine and is secured to member 125 of the frame E. The hollow shaft is rotated by a gear 136 meshing with a compound gear 161, 165, Fig. 19, the former meshing with a rack 160 formed on a cylinder 158 movable in a similar manner to the cylinder 99 by air pressure supplied by a valve 153 controlled by a cam 26 mounted on a shaft 25 driven by a chain 24 from the shaft 22; movement of the cylinder thus swings the frame E carrying the brush and rolls about shafts 126, 127. During its passage between the rolls, the edge of the sheet is abraded by the wire brush 220 which is driven by an air motor 303, Fig. 23, and mounted between plates 298, 299 on rods 278 slidably mounted in a frame 222 pivotally mounted in a carriage 221 ; the rods are provided with springs adjustable by screws 287 in housings 285 to vary the pressure between the brush and sheet. A block is secured to one of the rods 278 and, where the brush is moved by engagement with the sheet, actuates a valve to supply air to one or other of the ends of a cylinder 237 to cause the brush to follow the contour of the edge of the sheet by movement of the carriage 221 along rods 224 secured to the frame E, a lug 307 acting as a stop to limit movement of the brush towards the rolls 167, 168 ; seals 234, 284 protect rods 224, 278 from spent abrading material The frame 222 is oscillatable about an axle. 248 in the carriage 221 so that the whole of the width of the wheel is brough into engagement with the edge of the sheet, and the wheel thus worn uniformly, by a motor 259 on the carriage driving a crank 272 connected to an extension 273 of the frame. The sheet is prevented from moving away from the brush by rotatably mounted rubber-covered sleeves 320<SP>1</SP>, Figs. 4 and 27, spring-held in a central position on rods 322 secured to the frame members 122, 123. The sheet is discharged from between the rolls onto the take-off conveyer F which is initially in its upper position and pivots downwardly about a shaft 33 at one end and so as to receive the sheet as the frame E completes its swinging movement and pass it to a similar arrangement of conveyers and brushing means arranged to treat the opposite edge of the sheet. The conveyer F is controlled in a similar manner to conveyer C by a magnetic clutch 35, cam 37, valve 357 cylinder 358 and a counterweight. In operation, the sheet of glass is fed from the conveyer B onto the conveyer C and guided by the roller 114 to present the leading end between the rolls 167, 168, conveyer B being stopped by operation of a manual or time switch de-energising clutch 18 and operating a brake. Roll 168 is supported in a housing 183, Fig. 27, which is resiliently supported in the frame E and, on moving to accommodate the sheet, actuates a micro-switch controlling an electro-magnetic relay which disengages a brake and energises magnetic clutch 21 to rotate shafts 22, 25 and cams 23, 26. The cam 23 actuates the valve 96 which moves the cylinder 99 to upwardly pivot conveyer C, as the leading end of the sheet passes between the rolls, in timid relation to the swinging movement of the frame E caused by the can 26 actuating the valve 148 and moving the cylinder 158 and rack 160 engaging the gear drive to the frame, the frame moving in a clockwise direction as viewed in Fig. 19. The brush 220 engages the edge of the sheet which it follows as controlled by the valve and cylinder 237 actuated by the block on the rod 278. As the shaft 25 rotates, control cams 146, 147 thereon actuate microswitches to de-energise clutch 21 in conveyer C and energise clutch 35 in shaft 36 to cause the cam 37 to actuate valve 356 and cylinder 358 to lower the end of the take-off conveyer F as the sheet is fed from between the rolls. A control cam 373 on the shaft 36 thereafter disengaging clutch 35. The sheet.then continues through a similar arrangement to abrade the opposite edge of the sheet.