US3416412A - Container forming machine - Google Patents

Description

1968 L. wu cox CONTAINER FORMING MACHINE 16 Sheets-Sheet 1 Filed. June 7, 1967 I NVENTOR. ISAAC L. WILCOX.

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C A A B United States Patent 3,416,412 CONTAINER FORMING MACHINE Isaac L. Wilcox, Fulton, N.Y., assignor to Phillips Petroleum Company, a corporation of Delaware Filed June 7, 1967, Ser. No. 644,293 11 Claims. (Cl. 93-391) ABSTRACT OF THE DISCLOSURE A container forming apparatus wherein a side wall blank is partially wrapped about a mandrel, with an end portion of the blank extending beyond the end of the mandrel. A bottom closure disk i-s positioned in the extending end portion of the partially wrapped blank and the latter is then completely wrapped about the mandrel and closure. Mechanism is provided to fold the extending end portion of the side wall blank inwardly in sealing engagement with the bottom disk. The overlapping portions of the side wall blanks and bottom closure disks are joined by heated thermoplastic coat- 1ngs.

Background of the invention This invention has to do with a compact machine for forming cylindrical containers from sheet material, such as paperboard. The containers are formed from flat side wall blanks and flat bottom closure disks. At the present time, cylindrical paper containers are formed by inserting a flanged bottom closure into a spirally wound tube, the end of which, together with the flange of the closure, is curled inwardly. Generally, such containers are not liquid tight.

Tapered containers, including paper cups, are formed by completely wrapping a blank about a mandrel, inserting a flanged closure into the end of the wrapped blank and curling, or spinning, the end of the wrapped blank and the flange of the closure, and the end closure is fixed to the wrapped blank by adhesive. In both instances, such methods require bulky machines which operate at relatively low speeds.

Brief summary of the invention In the machine of this invention, the flat side wall blanks are partially wrapped about a mandrel with one end portion of the blank extending beyond one end of the mandrel. A bottom closure disk, not provided with any flange, is moved radially of the mandrel and positioned in the extending end portion of the partially wrapped blank. The blank is then completely wrapped about the mandrel and about the closure disk. Thereafter, the extended end portion of the completely wrapped blank is folded inwardly and sealed to the bottom closure disk. This seal is effected by a coating of thermoplastic material on the contacting surfaces of the blanks, which material is heated prior to the sealing operation.

Brief description of drawings FIGURE 1 is a side elevational view of a container forming machine embodying my invention, the bottom blank magazine and feeding mechanism being omitted in the view.

FIGURE 2 is an end elevational view looking to the right, FIGURE 1.

FIGURE 3 is a top plan view of the structure shown in FIGURE 1.

FIGURE 4 is an enlarged view of the center portion of the structure shown in FIGURE 2.

FIGURE 5 is a View taken online 55, FIGURE 4.

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FIGURE 6 is a view in top plan of the cam and linkage actuating mechanism of the side wall blank advancing structure.

FIGURE 7 is a view taken online 77, FIGURE 6.

FIGURE 8 is a perspective view of the structure for intermittently advancing the side wall blanks.

FIGURE 9 is a view taken on line 9-9, FIGURE 5.

FIGURE 10 is a view taken on line 10-10, FIGURE 5.

FIGURE 11 is a view taken on a line corresponding to line 1111, FIGURE 1, showing the body blank wrapping jaw mechanism in elevation.

FIGURE 12 is a view taken on line 12-12, FIGURE 11.

FIGURE 13 is a view taken on line 13-13, FIGURE 11.

FIGURE 14 is a side elevational view of the bottom blank magazine and feeding mechanism, with parts omitted.

FIGURE 15 is a view looking to the right, FIGURE 14.

FIGURE 16 is a vertical sectional view of the structure shown in FIGURE 15, looking to the left.

FIGURE 17 is a View taken on line 17-17, FIGURE 14.

FIGURE 18 is a view taken on line 18-18, FIGURE 17.

FIGURE 19 is a top plan view of the bottom closure sealing mechanism and mandrel.

FIGURE 20 is a view taken on a line corresponding to line 20-20, FIGURE 19.

FIGURE 21 is a view taken on line 21-21, FIGURE 20.

FIGURE 22 is a view taken on line 22-22, FIG- URE 19.

FIGURE 23 is a view taken on line 23-23, FIGURE 22.

FIGURE 24 is an enlarged sectional view taken on line 24-24, FIGURE 22.

FIGURE 25 is a fragmentary sectional view showing the bottom closure sealing head moved into engagement with the wrapped side wall, with the end portion thereof folded over the disk.

FIGURE 26 is a view, similar to FIGURE 25, showing the bottom disk sealing head moved to sealing position.

FIGURE 27 is a side elevational view of the arrange ment for discharging the completed containers stripped from the mandrel. J

FIGURE 28 is a view corresponding to line 28-28, FIGURE 27.

FIGURE 29 is a top plan view of the cam arrangement and linkage for operating the various components in the area of the mandrel.

FIGURE 30 is a view taken on line 30-30, FIGURE 29.

FIGURE 31 is an enlarged sectional view through the bottom corner of the container and contiguous portions of the mandrel and forming tools.

FIGURE 32 is a side elevational view of the formed container, the left portion being in cross section.

FIGURE 33 is a view illustrating the successive steps in the formation of the container.

Detailed Description The flow sheet, FIGURE 33, illustrates schematically the formation of the container. Flat side wall blanks are successively withdrawn from astack 41 and advanced in flat form underneath a heater. The heater functions to heat the uppermarginal surface 42 extending along the leading edge of the blank, and the uppermarginal surface 43 at one end of the blank. At the opposite end of the blank, the under side of themarginal surface 44 thereat is heated. The heated blanks are advanced to the position shown at underneath a fixedmandrel 47. With the blank in this U formation, a bottom are folded upwardly. The leadingheated edge 42 of the blank extends forwardly of the downstream end of themandrel 47. With the blank in this U formation, abottom closure disk 49 having a heated edge portion is moved downwardly at the end of the mandrel. The partially wrapped blank 48 is then completely wrapped about the mandrel, as shown at 50, the ends of the blank overlapping to form theside wall seam 51. The extended heated end portion of the wrapped blank is then folded inwardly against theheated disk 49, as indicated at 53. The side wall blanks andbottom disk closures 49 are coated with a thermoplastic material at least in theareas 42, 43, 44, and accordingly, theinfolded end portion 53 is sealed to the boto'm disk.

The container is moved forwardly off from the mandrel by avacuum cup 54. Thereupon, the container is moved laterally from the machine, as by apaddle 55.

Referring now to the machine proper, it is mounted upon arectangular base 60. Columns 61 extend upwardly from the left end portion of the base and support a table 62, FIGURES 1, 2 and 3. A pair ofside plates 63 extend upwardly from the table 62 and support atop plate 64, see also FIGURES 4, 5, 6 and 7.

Abracket 67 is fixed at each side edge of theplate 64 at the forward end thereof. Thebrackets 67 incline upwardly and rearwardly and support a pair ofbars 69. Thebars 69 are spaced apart and connected byend pieces 70. Thebars 69 are apertured to receive vertically disposedrods 72, and theend pieces 70 are apertured to receivesimilar rods 73. Therods 72, 73, provide a rectangular configuration for receiving thestack 41 ofblanks 40. Retainingpieces 75, see FIGURE 3, are mounted in thebars 69 and have their inner ends extending inwardly a slight distance under the side edges of theblanks 40 to support the stack.

A pair of advancingrails 77 extend fore and aft under the stack of blanks, the rails being spaced apart laterally and provided at their rear end potions with fixedblank pushers 78. Eachrail 77 is also provided with a pivotally mountedpusher 79 located forwardly of thepushers 78 and yieldingly maintained in upward position against stop pins 80. Therails 77 are also provided with a third set ofpushers 81, like thepushers 79, and spaced forwardly thereof. Thepushers 78, 79, 81, are spaced along the rails to provide proper advancement of theblanks 40 from one position to the next, the last being as indicated at 45 underneath themandrel 47. The rear ends of therails 77 are connected bystraps 83 to the ends ofrods 85. Therods 85 are slidably mounted in thehub portions 86 of a casting 87. The hub portions are formed with dependinglegs 88 positioned upon and secured to thetop plate 64.

The inner ends of therods 85 are connected together by a transversely extendingshaft 90 to which is pivotally connected anarm 91, the opposite end of which is connected to alink 93, the lower end of which is fixed to a shaft journalled in theside plates 63, see FIGURES 6, 7 and 8. Also fixed to theshaft 95 is anarm 97, the free end of which is connected byadjustable linkage 98 toarm 99. Thearm 99 is pivotally mounted, intermediate its ends, on ashaft 100 extending transversely between theplates 63. The opposite end of thearm 99 is provided with aroller 101 operating in agroove 102 formed in acam 103 mounted on and rotatable with ashaft 104 also journalled in theside plate 63. Theshaft 104 is rotated in timed relation with other mechanisms of the machine by achain 105, trained over a sprocket 106- fixed to theshaft 104 and over asprocket 107 fixed to amain drive shaft 200, FIGURE 29.

Aplunger 108 is arranged at each side of therail structure 77, theplungers 108 being movable vertically inblocks 109 fixed to the forward edge of thetop plate 64, see FIGURES l, 2 and 7. The lower ends ofplungers 108 are adjustably secured to across member 110 having a central depending lug 111 pivotally connected to anadjustable linkage 112, the lower end of which is pivotally connected to anarm 113, the inner end of which is journalled on theshaft 95, see FIGURES 6 and 7. Atension spring 114 serves to urge the arm upwardly to maintain aroller 115 thereon in engagement with the periphery ofcam 116 fixed to theshaft 104, see FIGURES 1, 6 and 7.Bars 117 are fixed to the bearing blocks 109 and depend downwardly therefrom.Blocks 118 are adjusta-bly fixed to the lower ends of thebars 117, and are provided withrubber bumpers 120 against which the lower ends of theplungers 108 strike when the plungers are moved to their down position bycam 116.

Alfixed to the upper end ofplunger 108 is arubber vacuum cup 123, and each plunger is provided with avacuum connection 124, see FIGURES 4 and 7. When the vacuum cups 123 are moved upwardly against the lowermost blank 40, see FIGURES 4 and 5, instack 41 by the action ofcam 116, permitting such movement byspring 114, vacuum is applied to theport 124. Upon downward movement of the vacuum cups 123, the lowermost blank 40 is pulled from the stack and deposited onto therails 77. Thereupon, therails 77 are moved forwardly by thecam 103, at which time the end portions of the blank are moved ontostationary rails 127 mounted onbrackets 128 extending upwardly from thetop plate 64. The blank is advanced bypushers 78 to the dotted position shown at 130, FIGURE 8, just forwardly of retainingmembers 131 fixedly mounted on the outer ones of the pairs of fixedrails 127. In this position, the blank is underheater 133, see FIG- URES l, 3 and 5. The heater is supported bybrackets 134 depending from across member 135 carried bycolumns 136 extending upwardly from thetop plate 64.

Theheater 133 is L-shaped having anend portion 140. The arrangement is such that the heater heats the upper surface along the leading edge of the blank, as indicated at 42, FIGURE 33, and theend portion 140 heats the upper surface of the end portion at 43, FIGURESl0 4 and 33. There is alower heater 143, see FIGURES 1, 5 and 10. This heater functions to heat the under marginal surface of the blank at the opposite end, Theheater 143 is supported bycolumns 144 mounted on theplate 64.

During the heating of the blank, therails 77 are returned to their starting position. The blank is retained under the heaters by the retainingmembers 131 on the fixed rails 127. Thepushers 81 move under the blank due to the fact that the pushers are spring pressed upwardly and accordingly, can descend under the blank during the return movement of therails 77. The blanks are held against therails 127 beneath theheater 133 and in the next position byleaf spring members 146, FIGURE 5, one of which is fixed to one of the cross bars 69 of the side wall magazine, and the other is fixed to theheater 133. The vacuum cups 123 withdraw another blank from the stack and deposit it onrails 77 Upon the next actuation of thearm 91, the blank engagingmembers 79 onrails 77 move the heated blank forwardly along therails 127 and forwardly of the retaining members on those rails, and the next succeeding blank is positioned under the heater by thepushers 78. Therails 77 are again returned to their starting position and upon the next operation of the blank advancing mechanism,pushers 81 onrails 77 move the first heated blank underneath themandrel 47. The table 64 is formed with anelongated opening 147 to permit movement of thelink 93.

A plate is mounted on a table structure 161 supported bycolumns 162 extending upwardly from thebase 60.Angle brackets 163 are fixed to the sides of theplate 160 adjacent the rearward end thereof. Thesebrackets 163 carry across member 164 to which themandrel 47 is fixed, the mandrel extending downstream from the cross member, see FIGURES 1 and 3. The blank is positioned tangential to the underside of the mandrel, as indicated at 45 in FIGURES 11, 12 and 13, the blank being positioned between the underside of themandrel 47 and alower clamp member 167. Theclamp member 167 has a dependingstem portion 169 slidably mounted in abracket 170 fixed touprights 171 extending from the base 60 to thetable top 160. Thestem 169 is formed with a vertically extendingslot 173 to receive apin 174, FIGURE 13, on which wrappingjaws 175, 176, are pivotally mounted. The confronting surface of these jaws are of arcuate form and dimensioned comparable to the diameter of themandrel 47. In their initial open position, as shown in FIG- URE 11, the jaws are adjusted so that the free end of thejaw 176 is positioned above the plane of the free end of thejaw 175. Each of the jaws is pivotally connected intermediate its ends to apush rod 180. The lower ends of these rods are freely slidable inbearings 181 mounted on a casting 182 which is slidable vertically onrods 183 fixed at their ends in mountingblocks 184 which, in turn, are fixedly secured to thecolumns 171, Acompression spring 187 encircles each of therods 180 and is interposed between an adjustingnut 188 at the upper ends of the rods and the bearing blocks 181. The lower ends or" the rods are provided with adjustingnuts 190, FIGURE 30, to limit upward movement of the rods and jaws by action of thesprings 187. Anadjustable linkage 191 connects thecarriage 182 to anarm 193 which is pivotally mounted on apin 194, see FIGURE 29. The pin is supported in abracket 195 mounted on thebase 60.

Thearm 193 is provided, intermediate its ends, with aroller 197 positioned in a cam track incam 198. Thecam 198 is fixed to ashaft 200 journalled inbearings 201 mounted on thebase 60. Rotation is imparted to theshaft 200 by achain drive 203 operated by the output of areduction gearing 204 driven by themain motor 205, see FIGURES l, 3 and 29. This arrangement imparts vertical reciprocation to thecarriage 182 and swinging movement of thejaws 175, 176, about thepivot pin 174 initially to the position shown in FIGURE 17. As the outer free ends of the jaws are swung upwardly against the blank 45, the laterally extending portions of the blank are moved upwardly to the position shown in FIGURE 17, at 48, and, in FIGURE 33. Due to the fact that the free end of thejaw 176 was initially located above the free end of thejaw 175, as explained in connection with FIGURE 11, the side of the blank contacted by thejaw 176 is moved to vertical position. However, the opposite side of the blank, contacted by thejaw 175, has not been moved to the full vertical position. At this time, the blank is clamped securely against the underside of the mandrel by thelower clamp 167. Theclamp 167 is moved upwardly by apush rod 207, the upper end of which is connected to thestem 169 of the clamp, and the lower end is arranged for free sliding movement in across member 208 fixedly mounted onspacers 209 fixed to thecolumns 171.

Acollar 210, FIGURE 11, is fixed to therod 207 and is maintained against the undersides ofstop projections 211 fixed to thecarriage 182. Acompression spring 212 is interposed between the guidingcross member 208 and the collar. Accordingly, upon initial upward movement of thecarriage 182, the collar androd 207 are moved upwardly by thespring 212, moving theclamp 167 against the blank and clamping the blank against the underside of themandrel 47. Upon further upward movement of thecarriage 182, force is exerted throughsprings 187 against thenuts 188, movingrods 180 upwardly and swinging the wrapping jaws inwardly to the position shown in FIG-URE 17. It will be recalled that the heated leading edge portion of the blank is extending downstream beyond themandrel 47.

There are a series of columns, as 213, extending upwardly from thetop table plates 64 and 160. These columns support a superstructure including a magazine and feeder for the container bottom disks, and a heater for heating the bottom disks. The bottom disk magazine is shown at 214 in FIGURES l4 and 15. It is of tubular formation and arranged to support a supply ofbottom disks 49 in stack formation. These disks are successively removed from the magazine by asuction cup 215 carried by anarm 216 fixed to ashaft 217 journalled in a bracket associated with themagazine 214. The shaft is oscillated by alink 219 which is actuated by acrank disk 220. When thesuction cup 215 is swung upwardly into contact with the lowermost disk in the magazine, vacuum is supplied through aconnection 223. When the arm is swung downwardly, the lowermost disk is withdrawn by the suction cup, and deposited into avertical guideway 225.

The guideway is formed by vertically disposedmembers 226, 227, the confronting edges of which are formed with slots, see FIGURE 18, for guiding the disks downwardly to the end of the mandrel into the partially folded side wall blank shown in FIGURE 17. Thecrank disk 220 is rotated in timed relation to the side wall blank advancing mechanism whereby, when a side wall is removed from thestack 41 for deposit on therails 77, a bottom disk is withdrawn from themagazine 214 and deposited in the guideway. It is, of course, necessary that the disk, withdrawn from themagazine 214, arrives in the partially folded blank. Accordingly, there are a number of disks descending in theguideway 225 and a plurality of side wall blanks advancing on the guide rails 127.

Stopmembers 230, of hell crank form, are pivotally mounted in therail 227. Thestop members 230 haveend portions 231 that are yieldingly urged into theguide slot 228 of theguide rail 227 and serve to prevent the disks from dropping free in the guide. In FIGURES 15 and 17, there are two of the disks being retained by themembers 230. A positive disk feed is provided. It consists of a pair ofbars 233 fixed to arod 234 journalled inbearings 235 attached to abar 236, the end portions of which are slidably mounted incross members 237 forming part of the disk guide structure. Anarm 240 is attached to thebar 236 and extends laterally therefrom and is connected to alink 241.

Acompresion spring 242 onrod 234 is interposed be tween thelower bar 233 and theupper bearing 235, the spring serving to prevent free rotatable movement of the shaft and bars 233. Each of thebars 233 is provided withpins 245 which extend inwardly between thevertical guides 226, 227, for engagement with thebottom disks 49. Theupper arm 233 is fixed to the upper end of theshaft 234 and has aradially extending arm 248. There is aninclined cam arm 250 attached to thevertical member 251, and there is a similarinclined arm 252 attached at the lower end of themember 251, see FIGURE 15. Attached to thelower arm 233 is anarm 257, similar to thearm 248. When the assembly is moved to the upper position, as shown in FIGURE 17, bylink 241, engagement of thecam arm 250 by thearm 248 will cause thebars 233 to swing inwardly to position thepins 245 for engagement with the bottom disks. Upon downward movement of the assembly, thepins 245 will move the disks downwardly in theguides 226, 227. At the bottom of the stroke of the assembly, thearm 257, engaging thecam arm 252, will cause thebars 233 to swing outwardly, in which position they are maintained until thearm 248 engages thecam member 250. Downward movement of the disks by thepins 245 will move the disks past the retainingmembers 230.

With this arrangement, it will be apparent that the disks are moved downwardly successively in the guide chute. During the dwell of a disk, indicated at 260, FIGURE 17, heat is applied to the disk by aheater 261, see FIGURES 3 and 14. During the dwell of the disk at this position, theheater 261 is moved into heat exchanging relation to the disk. Theheater 261 is carried by aplunger 263 slidably mounted in abracket 264. The plunger is provided with agas connection 265 and is connected to thepiston rod 266, FIGURE 3, of acylinder 267. The cylinder is supplied with fluid pressure to move theheater 261 into juxtaposition with the bottom disk blank 49 at theposition 260 for heating the blank during the dwell period thereof. As the bottom disk feed mechanism is reciprocated, thebottom disk blanks 49 are successively advanced to a position at the downstream end of themandrel 47, the blanks being deposited into the extending portion of the partially wrapped blanks.

When the blank is partially wrapped about the mandrel, as shown in FIGURE 17, the bottom disk advancing assembly is moved downwardly by thelink 241. The lower end of this link is pivotally connected to anarm 270, FIGURE 14, pivotally mounted in abracket 271, and having a depending portion provided with a roller engaged by alobe 273 oncam 272. The cam is mounted onshaft 274, as is also thecrank disk 220 for operating the diskfeeder vacuum cup 215. Theshaft 274 is journalled inbearings 275, FIGURE 20, and is driven by achain 276 trained over a sprocket on the shaft and asprocket 277, FIGURE 29, the latter sprocket being affixed to themain cam shaft 200. During this operation, theupper clamp member 280, FIGURES 14, 16 and 19, is moved downwardly toward the mandrel. This upper clamp member is fixed to a shaft journalled in abearing bracket 281 fixed to thecross member 164.

The clamp includes afinger 283 pivotally mounted at one end at 284 to the clamp. Thefinger piece 233 is yieldingly urged downwardly against the clamp by aleaf spring 285. Mounted on theside member 227 of the bottom disk vertical guide, there is arod 287 having a portion extending transversely of the vertical disk guide, FIGURE 15. Therod 287 is carried by ablock 288 pivotally mounted at 289 to theside member 227. Downward movement of the rod is restrained by apin 290. However, the rod can swing upwardly.

Theshaft 291, to which theclamp 280 is affixed, also carries an upwardlyinclined arm 292, the upper end of which is connected to alink 293, the opposite end of which is connected to a vertically disposedlink 294 through ayieldable coupling 295, FIGURES l4 and 19. Thearm 294 is pivotally mounted at ite lower end and is provided with aroller 297 engagingcam lobes 299, 300, the cam being also fixed to theshaft 274, FIG-URES 20, 2 1.

As theclamp 280 is moved downwardly, the outer free end of thefinger 283 engages therod 287 and is moved upwardly away from the clamp about itspivot 284. However, as the clamp moves downwardly, thefinger 283 snaps off from therod 287, and moves into the disk guide engaging the bottom closure disk moved downwardly by thelower bar 233, and moving the disk positively into the extending end portion of the partially wrapped side wall blank. The clamp is thereupon moved upwardly to the positions shown in FIGURES l4 and 16. This motion is imparted to the clamp by theshort cam lobe 299.

With the heated bottom disk mechanism positioned in the partially wrapped side wall blank, thecam 198 now effects further upward movement of thecarriage 182, FIGURES 11 and 12, swinging thejaws 175, 176, about their pivotal mounting to fully wrapped position. During this movement, the side portion of the blank contacted by thejaw 176 is wrapped about the mandrel preceding the wrapping of the opposite side of the blank by thejaw 175. This results from the initial setting of the jaws, as previously pointed out. The free ends of thejaws 175, 176, do not meet, whereby the overlapping side edges of the blank are exposed for engagement by theclamp 280 which is again moved downwardly bycam lobe 300, engaging the side wall seam and clamping the side wall against the top of the mandrel.

It will be understood that all of these operations occur in a timed sequence. As soon as theupper clamp 280 has engaged the side wall seam of the wrapped side wall, a folding and sealing mechanism is moved toward the mandrel. This mechanism is best shown in FIGURES 19, 23-26. It consists of acarriage 303 havingbosses 304 slidably mounted onrods 305 fixed at their ends to supportingblocks 307 mounted on the table top The carriage is movable toward and from the downstream end of themandrel 47. The carriage is apertured to slidably receive aplunger 310 provided at one end with across head 311 to which, in FIGURES 24, 26, is affixed aring member 312, as by screws, one of which is shown at 313. Apressure ring 314 is fixed to thering 312 by screws, one shown at 315, FIGURE 24.

The end of the carriage, confronting the mandrel, is counterbored to receive thecross head 311 and thering members 312, 314. The rear end of the carriage 30-3 is formed with a pair of circular recesses in which are mounted compression springs 317. Across head 318, FIGURES 19, 23, is pinned to the rear extending end of theplunger 310. Thecross head 318 is provided with threaded apertures to receive screws 320', the ends of which extend into the compression springs and carrycollars 321.

With this arrangement, theplunger 310 is held in inner or rear position in the carriage, as shown in FIGURES 23 and 24. There is anannular folding member 325 fixed to the for-ward end of the carriage and it is arranged concentrically about thepressure ring 314.

Theplunger 310 is apertured to slidably receive astem 327, to the forward end of which is affixed avacuum cup 54. The stem is formed with anaxially extending passage 329 connecting with a transverse passage 330'. Thestem 327 is urged forwardly by aspring 331, the limit of this movement being controlled by aset screw 333 threaded through the side wall of theplunger 310 and engaging an axially extending keyway in the stem, FIGURE 23.

Aclevis member 335 is pivotally connected to thecross head 318. Apush rod 337 is slidably mounted in theclevis 335 which is joined to aT head 338. Therod 337 is threaded to receive an adjustingnut 340. Acompression spring 341 is interposed between thenut 340 and theclevis 335. The opposite end of the rod is pivotally joined to anarm 343 which, in turn, is pivotally mounted intermediate its ends on abracket 195, FIGURE 30. The lower end of the arm is provided with aroller 346 engaging acam 347 fixed on shaft 2200.

Upon forward movement of the carriage toward the mandrel, thesuction cup 54 is moved into engagement with thebottom disk 49. As the carriage advances toward the mandrel, thefolding ring 325 engages the extended end portion of the wrapped side wall, and by the configuration of the folding ring, the extended portion of the side wall is folded radially inwardly, as shown in FIGURE 25. This movement has been imparted to the carriage through thesprings 317 which now compress upon further movement of the plunger 310'. Continued movement of the plunger 310' effects movement of the sealingring 314 into engagement with the infoldedportion 350 of the side wall, see FIGURE 25. The advance ment of the plunger and sealingring 314 continues, compacting the infoldedportion 350 of the side wall against thebottom disk 49 and pressing the latter against the end of themandrel 47.

The rear or downstream end of themandrel 47 is formed with acircular rib 360 adjacent the periphery of the mandrel. Thefolding ring 325 is formed with acylindrical flange 361 confronting the mandrel and the inner surface is formed on acurvature 362 which, upon engagement with the extending end portion of the wrapped side wall, functions to serve to fold the same inwardly over thebottom disk 49. Thepressure ring 314 is formed with concentriccircular ribs 363, 364. These ribs engage the infoldedportion 350 of the side wall and apply high pressure to the areas thereof indicated at 365, 366, FIG-URE 32, to effect a proper and permanent seal between theinfolded portion 350 and thebottom disk 49.

When the plunger has been moved to effect the sealing of the bot-tom disk, the stern 327 is moved inwardly of the

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