|Publication number||US3611886 A|
|Publication date||Oct 12, 1971|
|Filing date||Apr 21, 1969|
|Priority date||Apr 21, 1969|
|Publication number||US 3611886 A, US 3611886A, US-A-3611886, US3611886 A, US3611886A|
|Inventors||John W Scully|
|Original Assignee||Pneumatic Scale Corp|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (9), Referenced by (3), Classifications (23)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent John W, Scully Inventor Raynham, Mass. Appl. No. 818,034 Filed Apr. 21, 1969 Patented Oct. 12, 1971 Assignee Pneumatic Scale Corporation Quincy, Mass.
APPARATUS FOR PRODUCING AND ACCUMULATING CARTONS 3 Claims, 14 Drawing Figs.
US. Cl 93/36.3, 93/36 SQ, 93/52, 93/93 DP Int. Cl B311) 1/64, B311) 1/96, B31b 1/06 Field of Search 93/36 SQ, 36.3, 49, 52, 53, 93
References Cited UNITED STATES PATENTS Hirose Hess Hess LaBornbard.
Hartbauer Dieter Fuller... Back Primary ExaminerWayne A. Morse, Jr. Attorney-Robert R. Churchill 93/93 M 93/36.3 93/36.3 93/49 93/36 SQ 93/93 X 93/49 M 93/53 X 93/52 X ABSTRACT: Apparatus for producing flat side-seamed cartons from prescored carton blanks and for accumulating successive cartons in a manner such as to make it convenient for an operator in handling groups of cartons for distribution to other machines or for packing for future use.
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' SHEET 9 [1F 9 I INVENTOR By J. W Scufly fdhuae (Luca/Q40 ATTORNEY APPARATUS FOR PRODUCING AND ACCUMULATING CARTONS SUMMARY OF THE INVENTION This invention relates to the packaging art and contemplates novel apparatus for feeding, folding and side-seaming flat tubular cartons, known in the art as knockdown cartons, prepared from prescored carton blanks. The invention further contemplates novel provision for accumulating successive side seamed cartons in a uniform arrangement whereby an operator is enabled to conveniently remove groups of cartons manually for distribution to the magazines of packaging machines or for packing'the same in containers for shipment or storage. The side-seaming apparatus takes the form of a conveyor to which prescored cartons are fed and which has provision for applying adhesive to the blank, folding the blank to provide a side seam, pressing the side seam and discharging the side-seamed carton. The accumulating apparatus also takes the form of a conveyor onto which successive cartons are discharged.
In the illustrated embodiment of the invention novel provision is made for transferring successive flat tubular cartons from the side-seaming conveyor to the accumulating conveyor. Successive cartons thus transferred fall by gravity onto the accumulating conveyor. In practice, the two conveyors are provided with separate drives and the speed ration between the side-seaming conveyor and accumulating conveyor is such that the slower moving accumulating conveyor collects the cartons one on top of the other in overlapping relation with the leading edges of successive cartons spaced a short distance apart which in effect comprises a feathered or shingled relationship conveniently arranged so that an operator at the other end of the accumulating conveyor can easily grasp successive groups of cartons manually for distribution to other machines or for packing the same in containers.
In operation, the feeding mechanism is arranged to withdraw successive lowermost carton blanks from a stack thereof and to present successive blanks to a continuously moving conveyor where the blanks are first provided with a strip of adhesive along a seam-forming portion. The prescored panels on either side of the blank are then folded inwardly to join the marginal edges and to form a tube provided with a side seam. The side seam is then pressed to firmly set the adhesive and the carton is discharged onto the accumulating conveyor.
The illustrated blank-feeding device is arranged to withdraw successive lowermost prescored carton blanks from a stack thereof and to transfer the same to the side-seaming conveyor. Provision is made for preventing release of more than one blank at a time and for quickly releasing a jammed blank in the feeding device. Novel provision is made for folding successive blanks along two of the prescored lines whereby to present the marginal edges in overlapped engagement to provide a side seam, and novel provision is also made for pressing the side scam in a manner such as to confine the pressing operation to the adhesively secured portion only of the carton.
Accordingly, the present invention has for one object to provide apparatus for producing flat tubular cartons from prescored carton blanks characterized by novel structure adapted to produce cartons in a rapid, efficient and economical manner.
The invention has for another object to provide novel and improved apparatus of the character specified characterized by novel carton-blank-feeding mechanism arranged to withdraw successive carton blanks from a stack thereof at a rapid rate.
The invention has for a further object to provide novel and improved apparatus of the character specified having novel provision for accumulating successive cartons discharged from the aide-seaming conveyor in a convenient arrangement to be manually removed for distribution or packing purposes.
With these general objects in view and such others as may hereinafter appear, the invention consists in the apparatus for producing and accumulating cartons, and-in the various structures, arrangements and combination of parts hereinafter described and particularly defined in the claims at the end of this specification.
BRIEF DESCRIPTION OF THE DRAWINGS In the drawings illustrating the preferred embodiment of th invention:
FIG. I is a side elevation of apparatus for producing and ac: cumulating cartons embodying the present invention;
FIG. 2 is a plan view of the apparatus shown in FIG. I; i 7
FIG. 3 is a perspective view of a prescored carton blank from which the present cartons are produced;
FIG. 4 is a folded and side-seamed carton produced 'in'the present apparatus;
FIG. 5 is a view in side elevation of the carton bIank-feeding device including a magazine for supporting a stack of cartons;
FIG. 6 is a cross-sectional view at a'larger scale of the lower end of the magazine illustrating a modified form thereof and showing a blank partially withdrawn;
FIG. 7 is a view in front elevation of a portion of the magazine shown in FIG. 6;
FIG. 8 is a detail view in side elevation of modified folding members embodied in the side-seaming conveyor;
FIG. 9 is a cross-sectional view taken on the line 9-9 of FIG. 8 showing the modified folding members;
FIG. 10 is an end view of the side-seaming conveyor showing the side seam presser rolls and illustrating a modified form of operating mechanism;
FIG. 11 is a rear view of the presser-roll-operating mechanism;
FIG. 12 is a view in side elevation of the carton-accumulating conveyor,
FIG. 13 is a detail view in side elevation of the discharge end of the side-seamer belt and-the receiving-end of the accumulating conveyor; and
FIG. 14 is a plan view of the structureshown in FIG. 13.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings and particularly to FIG. 1, in general the present apparatus includes carton-blank-feeding mechanism 10 adapted to withdraw successive lowermost carton blanks 12 from a stack 14 thereof supported in a magazine 16. The upright stack is arranged at an angle of about 40,9.the vertical for convenience in loading the magazine and also to reduce the height of the unit.
The carton blanks 12 are prescored and, in operation, successive blanks withdrawn from the stack are advanced longitudinally to present the leading ends thereof first between advancing rolls 18, 20 and then between transfer rolls 22, 24, the latter being arranged to present the cartons to 'a horizontal conveyor indicated generally at 26 wherein a marginal edge, comprising the side seam flap 27, of the blank is provided with adhesive by a glue-applying roller 28 during the advance of the carton blank. The sidewall panels along the outeredges of the carton, including a narrow panel 29onone sideand a wider panel 31 on the other side, are then folded inwardly by folding rails indicated generally at 30 topresent the longitudinal marginal edges in overlapping and adhesive engagement. The carton is thus folded along two score lines and provided with a side scam, the latter being firmly pressed to set the seal by a presser roll 32 during the continuous advance of the blank. The blanks thus folded and sealed to form a flattube are propelled from the discharge end of the side-seaming-conveyor 26 onto the receiving end of an accumulating conveyor 34.
Referring now to FIG. 5 for a more detailed description of the carton-blank feeding mechanism'IO, it will be seen that successive lowermost carton blanks 12 in the-stack are arranged to be withdrawn by' engagementwith a plurality of laterally spaced friction belts 42 arranged to run over spaced idler pulleys 44 fast on a shaft 46 and spaced drive pulleys 48 fast on a shaft 50. The friction belts 42 are run continuously and each belt comprises a rubber belt having a plurality of small upstanding resilient projections thereon.
In order to control the withdrawal of successive blanks in timed relation to the operation of the machine, a plurality of laterally spaced lifting rolls 52, which extend between the spaced belts 42, are arranged to alternately elevate the stack 14 to lift the lowermost blank 12 away from the belts and to lower the stack to present the lowermost blank in frictional engagement with the belts to effect withdrawal of a blank. The rolls 52 are mounted on a rod 53 carried by spaced arms 54 which are mounted on a shaft 56. A second arm 58 carried by the shaft 56 is connected by a link 59 to one arm 60 of a bellcrank mounted to rock on a shaft 62. The second arm 64 of the bellcrank carries a roller 66 for cooperation with a cam 68 fast on a camshaft 70.
As herein shown, the rear edge of the lower end of the stack 14 engages a roller 72 carried by an arm 74 which is adjustably mounted in the magazine 16. The roller 72 carries some of the weight of the stack and is extended slightly forwardly of the rear edge of the stack so as to cause the leading edges of the lowermost group of blanks to feather out forwardly as shown. The forward end of the stack carries a plurality of angular guides 76 against which the feathered edges of the lowermost groups of blanks rests. The guides 76 are vertically adjustable and are arranged to cooperate with driven rolls 78 to assist in freeing the lowermost blank from the stack. In operation, the spacing between the lower ends of the guides 76 and the periphery of the rolls 78 is about one and one-half times the thickness of the carton blank. When the lifting rolls 52 are rocked to their elevated position, the blanks are raised above the friction belts 42 and, conversely, when the stack is lowered by the rolls 52, as shown in FIG. 5, the lowermost blank is engaged by the belts and carried under the guides 76 into the grip of the driven feed rolls 18, spaced a short distance forwardly of the front end of the magazine. In practice, the friction belts are operative to feed the forward end of the blank for a short distance only before the feed rolls 18, 20 take over the blank-advancing operation, the rolls being driven at a surface speed equal to the linear speed of the belts 42. As shown in FIG. 5, the spacing between the guides 76 and the rolls 78 permits only one blank at a time to be withdrawn from the underside of the stack. in operation, the lifting rolls 52 must be actuated to elevate the stack before the trailing end of the blank being withdrawn leaves the magazine whereby to prevent release of a succeeding carton immediately following the first. The cam-operated lifting rolls thus serve to control the spacing of the carton blanks in timed relation to the operation of the machine.
ln a modified form of magazine, as shown in FIG. 6, angular stop guides 398 are mounted for vertical adjustment in grooves 400 formed in frame members 402 which comprise a part of the magazine. Each frame member 402 is provided with a block 404 secured thereto and which spans the groove 400 to serve as a gib. Another block 406 serves as a second gib as shown. Each angular stop guide 398 is likewise provided with a block 408 secured thereto, and is arranged to cooperate with an adjustable stop stud 410 carried by and extended from a stationary block 404. A pair of springs 414 connected between studs carried by the guide block 408 and the stationary block 404 holds the stop guide down in its adjusted position relative to the roller 78. A nut 415 serves to lock the stud 410 in its adjusted position.
As herein shown, provision is made for quickly elevating the stop guides 398 to relieve a jam in the feeder. As illustrated in FIG. 6, a handle 416 pivotally mounted at 418 in a bracket 420 attached to the frame member 422 is connected by a curved link 424 to the movable block 408 attached to the stop guide 398. In operation, in the event a jam occurs between the stop guides and the rollers 78, the handle 416 may be raised to elevate the stop guides against the resistance of the springs 414. Conversely, when the jam is relieved, the handle may be released to return the stop guides to their adjusted position.
The leading ends of successive carton blanks 12 advanced by the feed rolls 18, 20 are received between the continuously driven transfer rolls 22, 24 to be delivered to the horizontal conveyor 26. As herein shown, the upper transfer rolls 22 are provided with cutouts 23 to receive the leading ends of the blanks and to ease their transition from an inclined position to a horizontal position on the conveyor 26.
The drives to the carton-blank-feeding device 10 include a chain and sprocket drive 80 from the camshaft 70 to the shaft 50 on which the pulleys 48 are mounted. The shaft 50 is connected by spur gears 82, 84, 86 to a shaft 88 on which the rolls 78 are mounted for cooperation with the guides 76. The shaft 50 is also connected by spur gears 90, 92 to a shaft 94 which carries the upper feed rolls 18. The shaft 94 is carried by spring-pressed block bearings 96 slidingly mounted in the side frames and the shaft 46 on which the pulleys 44 are mounted is also carried by block bearings 98 adjustably mounted in the frames to serve as a belt tightener.
The cam shaft 70 is driven by a chain and sprocket connection 100 to a shaft 102 which latter is connected by bevel gears 104, 106 to a longitudinally extended shaft 108. The latter shaft is connected by bevel gears 110, 112 to a driven shaft 114. The shaft 114 is connected by spur gears 116 to a shaft 118 which in turn is connected by a chain and sprocket drive 120 to a drive shaft 122. The shaft 122 comprises the output shaft of a speed-reducing unit 430. The input shaft of the unit is connected by a belt and pulley drive 432 to a motor 434.
As illustrated in FIGS. 1 and 2, the horizontal conveyor 26 includes a pair of laterally spaced chains 124 provided with longitudinally spaced lugs or flights 126 arranged to engage the rear or trailing edges of a blank 12 delivered to the conveyor by the transfer rolls 22, 24. The chains 124 are continuously driven and are arranged to run over upper sprockets 128, 130 mounted on shafts 132, 134, respectively, at each end of the conveyor; lower sprockets 136, 138 mounted on shafts 102, 114; and intermediate guide sprockets 140, 142. The sprockets 138 are fast on the shaft 114 to effect driving of the chains 124. The shaft 132 is connected by spur gears 144 to the shaft 146 on which the upper rolls 22 are mounted. The upper rolls are supported in block bearings 148 slidably mounted in the supporting frame.
ln operation, the surface speed of the transfer rolls 22, 24 is faster than the linear speed of the chains 124 of the conveyor 26 so that a carton blank 12 deposited on the conveyor comes to rest momentarily after leaving the transfer rolls until the chain lugs 126 engage the trailing end to start the blank forward to carry it through the machine. As shown in FIG. 1, the drive to the shaft 132 on which the lower roll 24 is mounted comprises a chain and sprocket drive from the shaft 102. it will be understood that the sprockets 128 on shaft 102 over which the carrier chains 124 run comprise idlers and that the chain and sprocket drive 145 is designed to effect rotation of the shaft 132 at a rate such that the carton blank 12 will be deposited on the conveyor 26 prior to arrival of the lugs 126. As herein shown, the blank is guided between side guides 150, 152 and under holddown rails 154, 156. The blank is first carried past the adhesive-applying roller 28 where the underside of the side seam flap 27 is provided with a coating of adhesive.
As shown in FIG. 1, the adhesive-applying roller 28 is relatively narrow and is mounted for adjustment on a shaft 158 arranged to be rotated in timed relation to the advance of the carton by chain and sprocket connections from the shaft 114 including a connection 159 to a shaft 160, a second connection 161 to a shaft 162 and a final connection 164 to the shaft 158. In practice, the roller 28 is rotated at a surface speed slightly less than the linear speed of the conveyor chains 124 so that the trailing end of the carton side seam flap will not receive a surplus of adhesive such as would occur if the applying roller were traveling faster than the blank. The applying roller 28 is arranged to run in a gluepot 166 provided with a quick-setting hot melt adhesive. As herein shown, the gluepot is carried by parallel arms 168 arranged to be lowered by a handle 170 to permit convenient cleaning and servicing of the same. One of the guide rails, 152, is provided with a short rail 172 overlying a portion of the applying roller and under which the side seam flap 27 extends, the rail 172 serving to retain the flap in operative engagement with the applying roller during the adhesive-applying operation.
The carton blank is then guided under shoes 174, 176 whose outer edges are aligned with score lines 178, 180, respectively, of the carton blank and past stationary folding rails 182, 184 shaped and bent to effect inward folding of the sidewall panels 29 and 31 through 180. As illustrated in FIGS. 8 and 9, in order to initiate the folding operation, particularly when the cartons are traveling along the conveyor at a high rate of speed, rotary folding members 183, 185 one on each side of the conveyor are provided. The rotary folders 183, 185 are mounted on a shaft 162 which is connected by a chain and sprocket drive 161 to the shaft 160. As herein shown, the holddown rails 154, 156 and the shoes 174, 176 are mounted for lateral adjustment on rods 186 carried by arms 188. The arms 188 are clamped to a longitudinally extended rocker shaft 190 journaled in bearing brackets 192 attached to the frame. The folding rails 182 on one side of the conveyor 26 are likewise carried by and adjustably mounted on arms 194 clamped to the rocker shaft 190. The folding rails 184 on the other side of the conveyor are carried by and adjustably mounted on arms 196 clamped to a rocker shaft 198. With this construction it will be seen that the operating elements of the side-seaming conveyor are adjustable for different sizes of cartons within predetermined minimum and maximum limits. As shown in FIG. 1, the side-seamed carton passes under a guide plate 195 on one side and under a rod 197 on the other side which serve to complete the creased fold along the score lines 178,180.
In practice, the holddown and folding elements are spring urged downwardly to a predetermined and adjustable stop position and are capable of rocking upwardly in the event of a jam. Suitable controls, not shown, may be provided for stopping the machine when such a jam occurs. It will be understood that the wider sidewall panel 31 comprises the first folded panel whereby to present the adhesive-coated flap 27 face up whereupon the narrower panel 29 is folded down on top of the flap 27 to provide the side seam indicated at 200. Immediately thereafter, during the continued advance of the carton, the side seam 200 is subjected to a pressing operation by driven pressure rolls including the roll 32 previously referred to and a cooperating roll 204arranged to spread and set the adhesive.
During the pressing operation, the carton is supported on a continuously moving belt 206 which is coextensive with the chain conveyor 26. The belt 206 and the driven rolls 32 and 204 are arranged to travel faster than the carrier chains 124 in order to pull the .carton ahead of the lugs 126 during the transfer from the chains to the belt. Thus, in practice, the pressure rolls not only press the glue seam but also accelerate the carton away from the chain lugs. As herein shown, the belt 206 runs over a drive pulley 212 fast on a drive shaft 222 and over a driven pulley 214 mounted to rotate on a stud 216 fast in a bracket 218. The drive shaft 222 is rotated by a chain and sprocket drive 220 from the carrier chain sprocket shaft 134 and is designed to effect a linear speed of the belt 206 at a faster rate than the linear speed of the carrier chains 124. The lower pressure roll 204 is also mounted on the pulley shaft 222. The upper roll 32 is mounted on a shaft 224 and is connected to rotate with the lower roll by spur gears 226. As herein shown, the upper roll shaft 224 is journaled in a bracket 228 pivotally mounted at 230 and is rocked in a direction to urge the roll 32 into cooperating engagement with the lower roll 204 by a compression spring 232 coiled about a rod 233 and interposed between a yoke 234 forming a part of the bracket 228 and a shaft 236 journaled in spaced arms 238 extended from a bracket 240 attached to the machine frame. In practice, the rod 233 may extend through the shaft 236 and connections to the lower end of the rod may be made to effect manual rocking of the bracket 228 to an inoperative position when desired. As herein shown, the lower end of the rod 233 may be provided with a hub 235 havinga cam surface atits upper end engaging the handle 237 and rocking of the handle will effect rocking of the pressure roll 32 upwardly.
In operation, it may be desired to limit the pressing'operation to the side seam area 200 only as defined by the flap 27 of the carton blank 12, that is, to maintain the roll 32 elevated until the closing flap area at one end'has passed and again lifting the roll before it engages the closing flaps at the other end of the carton so as to avoid squeezing glue out of the ends of the seam onto the closing flaps. This may be accomplished by rocking the upper roll 32 into and out of cooperating engagement with the lower roll 204 through cam-operated linkage. As herein shown, see FIGS. 10 and 11, an extension 436. from the bracket 234 is connected by a link 438 to one arm 440 of a two-armed cam lever pivotally mounted on the shaft 134 journaled in the frame. The second arm 442 of the lever carries a cam roll 444 for cooperation with a cam 446fast on a shaft 448. The shaft 448 is connected by spur gears 450 to the drive shaft 114. The cam 446 is adjustable to effect raising and lowering of the upper roll 32 each cycle of operation in timed relation to the passage of successive cartons. The cam 446 may be adjusted so that the upper roll 32 engages the side seam portion 200 only which corresponds to the length of the side seam flap 27.
The passage of the carton between the rolls 32, 204 also serves to accelerate the carton and in order to continue acceleration of the carton to propel the same onto the accumulating conveyor 34, a roller 242 carried by an arm 244 is arranged to cooperate with the discharge end of the belt 206 adjacent the pulley 214. The arm 244 is mounted to pivot on a stud 246 and is pressed downwardly by a coil spring 248 carried between an extension 250 from the arm 244 and a second arm 252 clamped to the stud 246. The stud 246 is adjustably mounted in an elongated slot 254'formed in a bracket 256.
As herein shown, the accumulating conveyor 34 comprises an elongated belt 452 which runs over pulleys 454, 456 at either end of the conveyor. The pulleys are mounted on shafts 458, 460, respectively, journaled in bearings 462 attached to side rails 464, 466 which are supported on floor stands 468. Suitable provision is made for maintaining the belt 452 in a taut condition, as indicated at 470, wherein a portion of the lower run of the belt extending between idler pulleys 472, 474 is engaged by an idler 476 carried by a pivotally mounted arm 478. A spring 480 connected between the, arm 478 and one of the floor stands 468 is arranged to rock the idler 476 downwardly to tighten the belt.
The pulley 454 at the receiving end of the conveyor comprises an idler and the pulley 456at the discharge end comprises the drive pulley. As herein shown, the shaft 460 on which the drive pulley is mounted is connected by.a chain and sprocket drive 482 to the output shaft ofaspeed reducer 484. The input shaft of the speed reducer is connected by a belt and pulley drive 486 to an electric motor 488. The conveyor is also provided with guide rails 490, 492 attached to. the side rails 464, 466 respectively.
In operation, the side-seaming conveyor 26 is disposed a short distance above the accumulating'conveyor 34 and is driven at a greater rate of speed than the'accumulating conveyor. In practice, a speed ratio of 20m 1 may be maintained and the speed of the side-seaming conveyor is such as to propel successive side-seamed cartons from the discharge end thereof to fall by gravity onto the receiving end of the slower moving accumulating conveyor. As a result, successive cartons which fall onto the belt 452 andbetween the guide rails 490, 492 are arranged on top of the other with the leading edges spaced apart a distance of 1 inch to provide in effect a shingled or feathered relationship on.-the belt 452/As illustrated in FIGS. 13 and 14, a pair of downwardly bent guide plates 494, 496 are adjustably secured, one on either side of the conveyor, at points in thepath of the cartonsdischarged from the sideseaming conveyor. The bent plates are disposed above and a short distance beyond the receiving end of the accumulating conveyor and are provided for the purpose of guiding and controlling the movement of the cartons propelled from the side-seaming conveyor whereby to effect a more or less uniform drop of successive cartons onto the accumulating conveyor. in a modified form of the invention, not shown, the downwardly bent plates may be replaced by a roller or by a continuously moving belt disposed in the path of the cartons discharged from the side-seamer-conveyor to serve the same purpose, that is, to apply some resistance to the forward movement of the cartons to provide a more uniform placement of successive cartons onto the accumulating conveyor.
The cartons thus accumulated and continuously advanced on the conveyor 34 may be discharged onto a platform 500 arranged coextensive with the upper run of the belt. The platform is supported by brackets 502 attached to extensions of the side rails 464, 466 as shown. The cartons thus accumulated and discharged may be conveniently grasped by the operator in groups for manual distribution to the magazines of carton-squaring and bottom-sealing machines, or they may be packed in containers for shipment or storage for further use.
Referring again to F IG. 5, provision is made for latching the cam lever 64 in an upraised position to maintain the stack 14 in an elevated position when it is desired to discontinue feeding of the carton blanks. This may be done by a manual control or by an automatic control of any usual or preferred construction. in either event, a normally closed solenoid valve 356, see FIG. 5, which connects a source of air from a pipe 357 to an air cylinder 358 is actuated to open the valve 356 upon closing of the circuit 359. Opening of the valve effects extension of the stem 360 which engages one arm 362 of a bellcrank pivotally mounted on a stud 364 carried by a bracket 366. The arm 362 is spring urged in a clockwise direction and the second arm 368 of the bellcrank is connected to one arm 370 of the latch 371 by a rod 372 fixed in the arm 370 and slidingly mounted in the arm 368. The rod 372 is provided with a nut 373 to limit the sliding movement and to the effect positive disengagement of the latch. A compression spring 374 coiled about the rod 372 is arranged to rock the latch in a counterclockwise direction on the stud 364 to present the latch 371 in the path of an extension 376 of the cam lever 64. This type of control is of advantage when it is desired to automatically discontinue the feed of the cartons in the event that a jam occurs in the side-seaming device such as to cause elevation of the folding elements wherein a microswitch 378 may be placed to close the circuit 359 to the solenoid valve 356 in such event, or a manually operated switch may be provided in the circuit. Another form of control for discontinuing the feed of carton blanks, as illustrated in FIG. 5, may comprise a photoelectric scanning unit indicated at 380 which is arranged to detect an oversupply of completed cartons at a forward point in the packaging line, and to actuate the solenoid valve 356 whereby to effect latching of the cam lever 64.
From the above description it will be seen that the present apparatus is capable of producing flat tubular or side-seamed cartons from prescored carton blanks in a rapid, efficient and economical manner. It will also be observed that the present apparatus provides novel carton-feeding mechanism and novel mechanism for accumulating the cartons whereby to facilitate manual handling of the same for distribution to other machines or for packing into containers for shipment or for storage for future use.
While the preferred embodiment of the invention has been herein illustrated and described, it will be understood that the carton blanks includin a conveyor, means for feedin successive prescored carton lanks onto the receiving en of said conveyor, means cooperating with the discharge end of said 0 conveyor for receiving and accumulating the side-seamed cartons including a second conveyor, said first conveyor arranged to discharge the cartons at a rate relative to the movement of the second conveyor such as to arrange the cartons one upon another with the leading edges of successive cartons spaced a short distance apart, said carton-blank-feeding means comprising a magazine for supporting a stack of prescored carton blanks, means for withdrawing successive lowermost carton blanks from the stack, means including stop guides for assuring release of only one carton blank at a time, means for adjusting said stop guides, and means for elevating the same to release a jammed carton blank.
2. ln apparatus of the character described, in combination, means for producing flat side-seamed cartons from prescored canon blanks including a conveyor, means for feeding successive prescored carton blanks onto the receiving end of said conveyor, means cooperating with the discharge end of said conveyor for receiving and accumulating the side-seamed cartons including a second conveyor, said first conveyor arranged to discharge the cartons at a rate relative to the movement of the second conveyor such as to arrange the cartons one upon another with the leading edges of successive cartons spaced a short distance apart, said accumulating conveyor disposed at a lower level than said first conveyor, the cartons being propelled forwardly from said first conveyor to fall freely by gravity onto the receiving end of said accumulating conveyor into shingled relation to preceding cartons, the side seams of said cartons being adhesively secured, said producing means including a cam-operated presser roll adapted to be raised and lowered to effect application of pressure to the side seam portions only of the cartons being advanced longitudinally on said first conveyor, said side seam portions extending along the body portion of each carton, each carton having closing flaps extended from the leading and trailing ends thereof, said camoperated roll being rockingly mounted, and said cam arranged to maintain the roll elevated until the closing flap area at the leading end has passed and to again lift the roll before it engages the closing flaps at the trailing end of the carton.
3. ln apparatus of the character described, in combination, means for producing flat side-seamed cartons from prescored carton blanks including a conveyor, and means cooperating with the discharge end of said conveyor for receiving and accumulating the side-seamed cartons including a second conveyor disposed at a lower level than said first conveyor, said cartons being propelled from said first conveyor to fall freely by gravity onto said second conveyor and into shingled relation to preceding cartons, and guide means comprising angularly arranged plates disposed in the path of the cartons to engage the same as they are propelled from said first conveyor whereby to control the free fall of the cartons during the forward movement thereof to provide substantially uniform placement of successive cartons being accumulated on said second conveyor, each conveyor being provided with a separate drive, said first conveyor being driven at a rate relative to the second conveyor such as to arrange the cartons one upon another with the leading edges of the successive cartons closely spaced.
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|U.S. Classification||493/132, 493/178, 493/126, 493/144|
|International Classification||B31B1/06, B31B5/36, B31B1/36, B31B1/56, B31B1/96|
|Cooperative Classification||B31B2203/003, B31B1/56, B31B1/06, B31B1/96, B31B2201/925, B31B1/36, B31B2201/0276, B31B2201/2637, B31B2201/2679, B31B2203/082|
|European Classification||B31B1/06, B31B1/96, B31B1/36, B31B1/56|