Patent GB-1371627-A (GB)
Title: Method and apparatus for making a hollow glass article
IPC: C03B35/12
Filed: 1971-10-01
Abstract: 1371627 Finishing hollow glass articles OWENS-ILLINOIS Inc 1 Oct 1971 [2 Oct 1970] 47529/71 Heading C1M To make a hollow glass article having a beaded edge finish at one end from a blank symmetrical about a vertical axis and with a moil integral with the intended beaded end, the article blank is conveyed moil downwards along a horizontal path while rotating the blank about its vertical axis, a narrow band of the blank is heated at the junction of the moil and article over a first portion of the path to sever the moil which drops freely from the blank and the severed edge on the article is then heated over a second portion of the path while the article is still rotated to form an annular bead on the article. The particular apparatus may be used in the production line of Specification 1,338,448. General.-As shown, in Fig. 1 containers C with moil M on a transfer machine 66 are transferred to individual chucks 42 on an endless conveyer 40 at loading point L where they are gripped by chuck fingers 192, Fig. 8, when over a closing mechanism indicated at 68. The containers C, which are at a temperature of 900- 1000‹ F., then pass between burners 70 which control temperature drop along the top run 43 and round the end turn 56 of the conveyer 40 to 800-900‹ F. required at the burn-of of the moil M, effected by main burners 74. The clucks 42 are rotated while passing through burners 70 and 74, by spin cycle devices 72 and 76 respectively. The first section of burner 74 has opposed burners giving high intensity flame jets over a narrow area to burn off the moil M, followed by a section to heat the severed edge and this section may have a wider flame and a combustion gas to give slightly less heat. The finished containers C then pass through an inspection station 78 which has provision for ejecting rejected ware by opening chuck fingers 192. The chucks 42 then pass down an inclined section 80 of conveyers 40 over a pocket conveyer. 84 moving therewith and a chuck opening mechanism 86 allows the finished containers C to enter pockets 82. The conveyer 40 then passes end turn 90 to the upper run 43, a chain lubricating mechanism 92 being periodically operated. Conveyer construction, Figs. 1, 5 and 6.-The chain 40 comprises pairs of spaced rigid links 94 with at one end a single hub 96 and at the other spaced hubs 98, 100 the hubs being coupled by a link pin 108, the hubs 98, 100 being locked thereto by a set screw 110, and the pin 108 supporting drive rollers 118 and support rollers 120 outside links 94. Intermediate drive rollers 118a are mounted on each link 94. Buttons 126 on the outermost hub 96 and mid point of its link 94 are provided for synchronizing the speed of the chain with other connecting machines. Each link pin 108 is hollow and provided with a fitting 112 for connection with a lubricating device 92, a wick 128 in the pin and radial bores 130 leading to the rotary bearing surfaces. Support rollers 120 are guided on inner and outer track sections 132, 134 mounted on a fixed frame F, the tracks 132, 134 being in a plurality of sections with thermal expansion joints to allow for the extreme temperature differences between operation and non-operation. At the entry and exit to each end turn 56, 90, Figs. 1 and 18, the chain tracks 132, 134 include a parabolic section 138 with constantly changing radius of curvature from the straight runs to the constant radius of curvature sections. Each pair of links 94 carries a chuck assembly comprising a pair of chucks 42 on a common housing 140, one behind the other. Conveyer drive and tensioning. Fig. 1.-The chain 40 is driven by a main drive sprocket 46 meshing with drive rollers 118, 118a at positions P-1 and P-2 on the upper and lower runs 43, 44 respectively and by a slave drive sprocket 50 engaging the lower run 44 only at position P-3, sprocket 46 being driven by motor 48 and sprocket 50 by motor 54 through a slip clutch 52, motor 54 being driven at a faster rate so that sprocket 50 exerts tension on chain 40 between the positions P-2 and P-3. Overall tension of chain 40 is effected by mounting sprocket 46 and the chain track at end 56 on a subframe 58 which can be shifted horizontally with respect to the main frame F by a screw jack mechanism 60. End turn 56 is mounted in the sub-frame 58, to allow for looser tension on the curve, by a threaded rod 62 with adjustable nuts 64. Chuck assembly, Figs. 8 and 9.-Each chuck assembly comprises a pair of chucks 42 mounted one behind the other on a common housing 140 having a platform 142 joining vertical sleeve sections 144 with bearings 146, 148 for a shaft 150 for each chuck 42. A semi-cylindrical tongue 152 extends forwardly from housing 140 and seats over a sleeve 114 on the link pin 108 and is secured by a nut on a threaded stud 116 on pin 108 extending through a slot 154. An arm 158 projects on the outer side of rear sleeve section 144 and has a hub 160 supporting a roller 162 which rides in a track 164 on machine frame F. A guide shoe 166 on the opposite side of platform 142 co-operates with guide tracks 168 while passing through the main burner 74 to locate the chucks 42 accurately relative to the burners. Each chuck 42 comprises shaft 150 rotatable by a sprocket 170 thereon engaged by chains in spin cycle mechanisms 72, 76, while passing between burners 70 and 74 respectively. Spin cycle mechanisms 72, 76 include chains, stationary and driven endless, respectively, both of which have specially tensioned sections. Each shaft 150 includes at its upper end a stud 176 with a threaded portion engaging a tapped bore 178, the stud 176 removably clamping to the shaft 150 a fulcrum plate 174, plate 174 being locked, as by a tab, against rotation on shaft 150. A seat 186, with seat element 190 for container C, is removably secured to stud 176 by a bolt 184 in tapped bore 182. The chucks 42 can thus have different length studs 176 and size seat elements 190 for different size containers C, so that the burners 70, 74 do not require to be adjusted other than by small amounts. Similarly different fulcrum plates 174 may be used to alter the - position of gripping fingers 192 which it supports. Three gripping fingers 192 are mounted on outwardly extending arms 196 on plate 174 on fulcrum pins 194 by means of side plates 198 which are joined by spacer pins 200. The lower ends of plates 198 include a cam slot 202 engaged by cam rollers 208 on a common pin 201 at the end of arms 206 on an actuating plate 204. Actuating plate 204 is secured by bolts 212 to a sleeve 214 mounted for axial movement on shaft 150, a tab 216 on plate 204 engaging a keyway 218 on shaft 150 to prevent rotation, the sleeve 214 being pressed upwardly by a compression spring 220. Downward movement of sleeve 214, to open the gripping fingers 192, is effected by a lever mechanism 222 mounted on housing 140 by spaced pivot pins 242 on projections 244 and 246 for front and rear chucks 42, the lever 222 having a roller 248, on a shaft 230 thereof, which engages a cam at the appropriate location 78 or 86 on the machine frame. After opening of the gripping fingers 192 at either rejection station 78 or transfer position 86, they are maintained open, until operated by a cam at the closing position 68, by means of a latching notch 258 on a lever 252 engaged by the shaft 230. Burner mounting, Figs. 15, 16, 17.-Pre-heat burners 70 comprise spaced opposed pipes (270) on opposite sides of the join of moil M to container C and are provided with a plurality of bores (274) forming nozzles through which combustible gas under pressure is expelled to give rows of flame jets. Main burner 74 comprises a series of paired modules 282a, 282b, each carrying a burner unit 304 mounted on T- shaped brackets 302, the modules 282a, 282b being mounted for independent horizontal, vertical and pivotal adjustment relative to the machine frame F. Each module 282a, 282b includes a frame member 284 with end housings 286 slidable on fixed tubular members 290 and horizontally adjustable by jacks 292. Each end housings 286 is fixed to a post 294 which carries a sleeve 296 and bracket 298, the brackets 298 of the series of modules pivotally carrying an elongate pipe 300 to which the T-shaped brackets 302 are welded. Vertical adjustment of brackets 298 is by jacks 318 and pivotal movement of pipe 300 with brackets 302 is by means of a clamp 320 on pipe 300 with a crank arm 326 secured by a pin and slot connection 324 to a jack 322 mounted on frame member 284. Burner construction, Fig. 13.-Burner unit 304 comprises an upper housing member 330 with a longitudinally extending recess 334, in the flat bottom surface 332, terminating just short of each end of member 330, the recess 334 being connected by passages 340, 336 and screw threaded section 342 to a supply conduit fitting through which combustible gas can be fed. A shim plate 344 abuts surface 332 and is formed with parallel slots 346 extending rearwardly from front edge 348 to interconnect with recess 334, a plate 350 below shim 344 with recess 352 completing the combustion chamber with outlet slots 346. Below plate 350, a second shim plate 354 of reduced width and a lower housing member 358 with recess 360 form a chamber with a continuous sot 370 through which air under pressure is supplied through passages 364, 362 and screw-threaded section 366 connected to an air supply. The various plates are clamped together as by screws 368 to allow replacement of the shim plates. During the moil severing operation, when a narrow flame is required, the skim plate 344 will be thin, but a thicker shim plate will be used for edge finishing. Shims 344 may also have differing slot dimensions or spacings. Lubricating device for chain, Figs. 18, 22.- Lubrication mechanism 92 comprises a fourarmed star wheel 580 on shaft 582 having its axis coincident with the centre of curvature of end turn 90, the wheel 580 being driven by chain pins 108 e