US2744491A

US2744491A - Adhesive applying means for containerforming machine

Info

Publication number: US2744491A
Application number: US311370A
Authority: US
Inventors: John G Vergobbi
Original assignee: Pneumatic Scale Corp
Current assignee: Pneumatic Scale Corp
Priority date: 1952-09-25
Filing date: 1952-09-25
Publication date: 1956-05-08
Anticipated expiration: 1973-05-08

Description

May 8, 1956 J. G. VERGOBBI ADHESIVE APPLYING MEANS FOR CONTAINER-FORMING MACHINE Filed Sept. 25, 1952 5 Sheets-Sheet 1 INVENTOR. end/eggo/ BY Array/Y6) May 8, 1956 J. G. VERGOBBI 2,744,491

ADHESIVE APPLYING MEANS FOR CONTAINER-FORMING MACHINE Filed Sept. 25, 1952 3 Sheets-Sheet 2 INVENTOR.

@iwunlu li HTT'OIYNE'Y y 8, 1956 J. G. VERGOBBI 2,744,491

ADHESIVE APPLYING MEANS FOR CONTAINER-FORMING MACHINE Filed Sept. 25, 1952 3 Sheets-Sheet 3 IN V EN TOR.

Q/on BY QMQA W.

United States Patent ADHESIVE APPLYING lViEANS FOR CONTAINER- FGRMING MACHINE John G. Vergohbi, Quincy, Mass., assignor to Pneumatic Scale Corporation, Limited, Quincy, Mass, a corporation of Massachusetts Application September 25, 1952, Serial No. 311,370

Claims. (Cl. 118-5) This invention relates to a container-forming machine and particularly to web-feeding and registering mechanism for a container-forming machine.

The invention has for an object to provide a novel and improved container-forming machine wherein a printed web of flexible sheet material is utilized to produce successive container-forming sections and wherein novel provision is made for controlling the feeding of the web to effect registration of successive printed sections with relation to adhesive-applying mechanism and to websevering means.

With this general object in view and such others as may hereinafter appear, the invention consists in the containerforming machine and the various structures, arrangements and combinations of parts hereinafter described and particularly defined in the claims at the end of this specification.

In the drawings illustrating the preferred embodiment of the present invention:

Fig. l is a side elevation of a container-forming machine embodying the present Web-feeding, adhesive-applying and registering mechanisms; 1

Fig. 2 is a plan View of a portion of the Web of con tamer-forming material illustrating the adhesive stripsand registration marks; g y 3 Fig. 3 is a front elevation of the mechanism; from the line 3-3 of Fig.1; V V Y Fig. 4 is across section of differential driving mecha nism taken on, line, 4-4- of Fig. 3;

Fig. 5 is a cross section taken on line 55 of Fig.4;

Fig.6 is aplan view of the web-feeding and adhesive: applying rolls and gearing mechanisms; v

Fig. 7 is a side elevation of thelatchpcam lever. and cams of the registration mechanism; 1

Fig. 8 is a detailview in side elevation of the pawl and ratchet mechanisms; v

Fig. 9 is an electrical wiring diagram for the control mechanism; and a Fig. 10 is a side elevation of the control mechanism timing device. p I

In general, the present invention contemplates novel Web-feeding and-registering mechanism for a containerforming machine for continuously advancing a; printed web .of container-forming material into operative rela: tion to adhesive-applying mechanism adapted to apply strips of adhesive in a predetermined pattern to succes-. sive printed sections of the web, and to a cutterfor sever,- ing successive printed, sections of the web advanced. into operative relation to the container-forming mechanism. The container-forming machine maycornprise a machine as viewed of the type known in the trade as a double-package maker having a plurality of horizontally extended and intermittently operated container-forming blocksabout which an inner lining section and an outer carton are successively;

wrapped to form a lined container. I v I In practice, it has been found that when acontinuous printedweb of container-forming material is fed to a container-forming machine to form a plurality of sucgu tar Patented May 8, 1 956 cessive containers, the printed web sections may vary from a predetermined length due to changes in atmospheric conditions within the web itself and the stresses caused by the web-feeding mechanisms. This factor creates a serious problem when each container or package-forming section of the web contains printed matter, such as brand names and the like. In order that commercially acceptable printed packages may be formed by the packaging machine, each printed package-forming section of the web must be substantially in register with the adhesiveapplying and web-severing mechanisms within predetermined tolerances. It has been found that if one of the package-forming sections is not in proper register the amount of deviation increases in successive web-feeding cycles. The novel and improved web-feeding adhesiveapplying and registering mechanism of the present invention substantially eliminates this problem and enables the container-forming machine to successfully form successive printed packages which will be commercially acceptable from the continuously moving web of containerforming material.

In accordance with the present invention, provision is made for detecting a variation of the continuously advanced web from a predetermined position relative to printed indicia, such as registration marks on successive sections at a predetermined time in the continuous advance thereof and for effecting a corrective feeding of the web during such advance to eifect registration of successive printed sections with the adhesive-applying mechanism and with the cutter for severing successive sections whereby the variations in length of successive printed sections are within predetermined tolerances of the predetermined normal length.

In the preferred embodiment of the invention, the adhesive-applying mechanism and the web-severing means are operated in timed relation to the container-forming machine and the web is preferably fed at a continuous rate such as to advance a length slightly less than the predetermined. normal length each cycle of operation; Cumulative lagging of successive printed sections will be detectedby the control means to eifect acorrective'feeding stroke which is preferably arranged to advance the web an additional incrementsuch that .the total advance during a corrective feeding cycle is slightly more than the predetermined normal length. Thus, in practice, a

', web having a normal predetermined length between registration-marks will require a corrective. advancing stroke periodically as, the cumulative effect of the shortened feeding rate is detected and any variation in the spacing of the registration markson the web due to atmospheric 1 or other causes will also effect a corrective advancing ferent lengths ofprintedsections in a novel and simple Referringnow to the drawings, in the illustrated bodiment of the invention provision is. made for con:

tinuously, advancing a printed .web Ofcontainer-forming. material It) through a distance substantially equal to.

and preferably slightly less than the normal predeter. ined'length of each successive individual printed sctionof the web during each'cycle of operation of the. v packaging machine, and for concurrently applying spaced strips of adhesive in a predetermined pattern to suecessiveprinted sections of the web. Theweb is provid'ed with spaced registration marks ll, and provision, is made for detecting any variation from a pre,det e1-y mined position of successive registration marks at-a. predetermined time in each cycle and for" advancing the a web an additional increment when such variation is detected. The packaging machine embodying the present invention may comprise any usual or preferred form now upon the market, such for example as the machine illustrated in United States Patent to Hesser. No. 1,020,821, issued March19, 1912. Reference may be had to said patent for a description of the packaging machine, and only such portion thereof as will enable the present invention to be understood has been illustrated.

As best shown in Fig. l, a printed web of containerforming material is withdrawn from supply roll 18 by driven

feed rolls

40, 42. The web is first arranged to pass from the supply roll 18 between cooperating

scoring rolls

22, 24 adapted to remove any curl in the web 10, and thereafter passes around feed roll 40 and between

feed rolls

40, 42. Adhesive pattern-applying roll 46 is positioned adjacent feed roll 42 in pressed relation thereto, and the web 10 passes between said

rolls

42, 46, at which time the predetermined adhesive pattern illustratedin Fig. 2 is applied to the successive lining sections of the web 10. In practice, the adhesive strips are preferably applied in a predetermined position oneach web section to form the side seam and a bottom seal for the package produced on the packageforming machine. The web 10 thereafter moves past a photo-sensitive detector. unit indicated generally at 58, between idler rolls 53, 55, through a paper break safety. device 50 including take-up roller 52; and thence to the intermittently operated feeding rolls 54, 56 and cutting mechanism 57 forming a part of the containerforming machine.

As herein shown, the feed rolls 54, 56 are arranged to be intermittently operated through a rack and pinion drive 47 actuated by a cam 49 fast on themain cam shaft 68 of the container-forming machine. It will be observed that the length of material advanced by the continuously operated

feed rolls

40, 42 during the idle period of the intermittently operated feed rolls 54, 56 will be taken up by the weighted and pivotally mounted roller 52. The intermittently operated rolls are arranged to be rotated in a manner such that the entire slack portion of the continuously fed web is taken up and advanced by the feed rolls 54, 56 each intermittent feeding cycle so that the web is taut between the feed roll 42 and the feed roll 56. The upper roller 54 of the intermittent drive comprises an idler so that when the web is fully advanced. to a taut condition, the rolls 54, 56 may slip on the web. Thus in operation, the web is intermittently advanced in variable lengths a distance corresponding to the rate of continuous advance and the corrective feeding movements effected by the

feed rolls

40, 42 each cycle of operation whereby successive container-forming sections advanced will be in substantial registration with the severing means 57 within predetermined tolerances. It will also be observed that in the event'of a break in the web 10, the weighted roller 52 will be rocked downwardly to open switch contacts of the'safety device 50 and discontinue operation of the machine.

In the operation of the present web-feeding device during each cycle of operation of the package-forming machine, the continuously moving web 10 is normally advanced a distance approximately A less than the predetermined normal length of one of the web package sections, and is additionally advanced an increment slightly less than the remaining ,6 the total normal advance thus far being slightly less than the predetermined normal length of a package section. The control mechanism 48, responsive to the detector unit 58, is arranged to advance the web 10 a further increment whenever improper registration is detected by the photosensitive detector unit 58, the total advance during a correcting cycle being slightly more than the predetermined normal length.

In general, the control mechanism 48 includes: a photo-sensitive detector, indicated generally at 58, arranged to cooperate with the spaced registration marks 12, positioned one on each package section of the web 10, during each cycle of operation; a timing mechanism 60 is arranged to render the detector unit 58 operative for a predetermined length of time during each cycle of operation; and a solenoid 59 arranged to actuate latch mechainsm 62 to render the corrective feeding means operative when a deviation from proper registration is detected by the detector unit 58 in order that the web be advanced a further increment into proper package-forming registration.

The detector unit 58 herein illustrated is arranged to be excited to actuate the web-advancing mechanism only when the light beam is intercepted by a mark during the scanning period, that is, when the circuit is closed by the timing switch, and only when the light beam is cut off by the leading edge of a rapidly passing mark. If'the mark does not appear during the scanning period, no correction is made, and if the beam falls directly on the mark and then falls on the lighter portion of the passing web during the scanning period, no further correcting advance of the web is made.

Referring now particularly to Figs. 1 and 6 for a more detailed description of the web-advancing, adhesiveapplying and registering mechanisms, as therein shown, driven feed rolls 40, 42 are arranged one substantially above the other to be rotated in opposite directions one from the other to thereby withdraw the printed web of container-forming material 10 from the supply roll 18 which is rotatably positioned on stud 20. The withdrawn web 10 is unwound from the supply roll 18 and passed between scoring rolls 22, 24, each rotatably positioned on

studs

26, 28, and thereafter passes between feed rolls 40, 42 arranged to cooperate in pressed relation with each other to advance the web 10 continuously in the timed relation to the operation of the container-forming machine.

The driven feed rolls 40, 42, rotatable within bearings set in the machine frame are driven from and arranged to be rotated by the main drive shaft 68 of the packaging machine by connections including spur gear 70'fast on sleeve 188 arranged to cooperate with spur gear 74 fast on shaft 76, bevel gears 80, 82, inclined shaft 84, bevel gears 86, 88, shaft 90, bevel gears 92, 94, shaft 96 and bevel gears 100, 102, the latter being fast on the main drive shaft 68 of the packaging ma chine. Feed roll 42 is connected in driving relation to feed roll 40 by means of spur gears 104, 106 fast on

roller shafts

76, 110 respectively, said rolls being driven continuously in timed relation to the operation of the container-forming machine during the normal cycle of web feeding.

As best illustrated in Fig. 6, the adhesive pattern applying roll 46 fast on shaft 72 rotatably set in bearings in the machine frame is provided with spur gear 112 arranged to cooperate with spur gears 114, 116 fast on

roll shafts

118, 120 respectively to rotatably drive the adhesive-transfer rolls 124, 126. Adhesive-transfer rolls 124, 126 are arranged to cooperate with the adhesiveapplying roll 46 and are adapted to receive a supply of liquid adhesive from adhesive supply pipe 130 and to transfer the liquid adhesive from its source of supply in a smooth, even manner to the adhesive-applying roll 46, which in turn applies the same to the moving web in a predetermined pattern. The surplus adhesive falls into a pan 230 and is guided into a conduit 232 back to a supply tank to be recirculated. The adhesive-applying roller 46 may be of a circumference slightly less than the predetermined normal length of a container-forming section.

In practice, during one cycle of operation of the container-forming machine, the web is advanced through rotation of driven feed rolls 40, 42 such that the web is advanced a distance equal to substantially $6 less than the predetermined normal length of an individual package-forming section of the web 10. The web 10 is then advanced an additional small increment so that at the end of the second increment of advance the total advance is lightly less than the predetermined normal length of an individual package-forming section. In other words, the length of web advanced each cycle during the continuous feed of the web is primarily governed or controlled by providing feed rolls 40, 42 of predetermined diameter sizes such that during one revolution thereof through the drives heretofore described, the web 10 will only be advanced a certain predetermined distance substantially less than the predetermined normal length of each container-forming section, and an auxiliary webadvancing means is provided for advancing the web 10 an additional small increment each cycle so that during each normal cycle of operation, the feed rolls eflfect advance of the web 10 a distance slightly less than the predetermined normal length of said section.

In accordance with one feature of the present invention, such auxiliary web-advancing means is provided for the purpose of enabling the initial rate of advance of the web during each cycle to be adjusted to accommodate variations in the predetermined normal length of the sections and to provide adjustment so as to assure a normal advance of the web a distance slightly less than such predetermined normal length.

Referring now more particularly to Figs. 3 and 9, the auxiliary advancing means includes a pawl and ratchet mechanism arranged to be actuated by a cam 128 fast on shaft 90 arranged to cooperate with cam lever 130 pivotally mounted on stud 132 fast in the machine frame, said'cam lever 13!} having a cam roller 134 at one end thereof held in cam-engaging position by spring 136 attached to lever 130 and the machine frame. The other end of the lever 130 is provided with a slot 239 in which a connecting rod 14%) is 'adjustably securedL The other endofrod 140 is adjustablyconnectedto a pawlcarrie'r l-38 pivotally mounted on a stud 148 and which carries a pawl l42 which is adapted to cooperate with ratchet 144 fast -onstud 143. A spur gear 150 also fast on stud 148 is arranged to'mesh'with a gear 152 forming a' p art'of a differential gear train 172 and which is rotatably mounted on shaft-'72. The gear 152 is held normally'in a stationary position by' suita'ble' braking means, indicated generally at 154,includin'g diskf1 56 fast on stud 148 and disk 158 carried' by bracket 160 mounted on the" machine frame. Disks 15 6, 1 58 "far arranged to be normally held infrictional engagement with'each other by spring-pressed lever 164an'd' bolt-166 to maintain

gears

150, 152 inastationary position.

As illustrate'din Figs. '4'and 5, the differentialgear train; indicated generally'at 172,*mounted on shaft '72 comprises a driving gear 1'74 keyed fast onshaft 72' arranged to' revolve with said'shaft, and gears 178, "180 arranged to each mesh with gear 174 are positionedon the. diameter line of gear 174 each on 'o'pp'osite'sides thereoful Saidgears' 178, 180 :are mounted on studs -182,"134 fast inzgear 152 such that they'will remain stationary withrelation to .their.position on the diameter'line of driving'gear 174 and yet revolve on said .studs when'd'riven by gear-174. .Gear 152, rotatably mounted on'shaft 72, is adapted to mesh'withlspur gear 150 and carry gears 178,180. on

studs

182, 184 fastened thereto, as heretofore described. A rotatable sleeve member'188- is mounted :loosely on'shaft 72 and is arranged toicarry.

keyed-thereto spurygear Wand internal-gear194 which isprovided with teeth'adapted to mesh with the teeth of gears 178,180. I

From the description thus far it Willbe seenthat the shaft-.72 is .drivenatIa constant rate offspeedin timed relationto the container-forming machine'and that-the adhesive-applying roller 46 fast on shaft 72 is'rotated ata constant speed.u"It will befurther observed that the drive to the feed rolls 4t), 42 is effected through the differential gear train through gear 174 fast on shaft 72, gears 178, 180, internal gear 194, and gears 70, 74 so that as long as the gear 152 is held stationary, the feed rolls 140, 142 will be driven at a related constant speed. Each cycle of operation, the pawl and

ratchet mechanism

142, 144 efIects a small increment of rotation of gear 152 thereby increasing the rate of feed slightly, preferably so that the total advance per cycle is slightly less than the predetermined normal length of a Web section, since the present correcting mechanism is not designed to correct for overfeed of the web. As herein shown, such increment of advance may be varied by adjusting the length of stroke of the pawl carrier 138 by adjusting the rod in the slot 239 or by connecting the rod in a different one of a plurality of openings 237 formed in the pawl carrier 138.

Thus, in operation, the initial length of web fed each cycle may be adjusted to conform substantially to or preferably slightly less than the predetermined normal length of each web section. It will be further observed that since the adhesive pattern applying roller 46 is driven at a constant rate, and the rate of feed of the web may be variable, in practice the web may slip relative to the adhesive-applying roller. However, since the difference in rate of travel is so slight such slippage is negligible so that substantially correct application of the predetermined adhesive pattern is effected each cycle of operation.

Referring now to Figs. 1, 7 and 8 in particular, similar cam-actuated means are provided to advance the continuously moving web 11' a second small increment in response to the detector mechanism 58 whenever said detector 58 is excited due to a deviation from a predetermined position of advance of the package-forming sections. Said means includes a cam 1259 fast on cam shaft 99 and a cam lever 137 provided with a raised portion comprising a latch 62 and pivotally mounted on stud 132. Said lever 137 is provided with cam roller 139 at one'end thereof and a pawl and ratchet "mechanism 143,145' adjustably connectedjto its opposite ehdfl ay rod 141. Thepawl 143'is 'ca'rriedby an arm 238'loosely mounted on the stud" 148 Ratchet fast on stud 1481s arranged to rotate said shaft when urged by;the' cam-actuated 'pawl"mechanism,"and in turn gear 150 is rotated causing it to slip against brake means 154; As hereinbefore' describe'djthe rotation of gear 156* is transmitted throughthe diiferential gear train 172' to advance the" feed rolls 49, "42 an additional increment independently ofithe' adhesive rolls as, 124,126 and thus to bring the successive package-forming sections into proper registration with the :adhesive-applyin g mechanism and the web-severingmeans. I During the normal jeeding operation, apivotally, mounted latch-engaging member 262 connected; to thearmature 263 of solenoid-;59i;engages' the latch 62*an'cl: holds ,thesame out of cam-engaging position. -However,. when the detector unit '53 is'excited, indicating thatthe packagewforming section deviates, from a predetermined normal position with relation topackage-formingmech;

aidisms during predetermined scanning period, the; latch v62 is released by thel-operation of solenoid 59. Thus, the cam-operatedlpawl, and ratchet .mechanism 143, 1455s renderedjoperative .to. advance the web ugh the means hereinbefore described. As illustrated jg. 7, 'the web-advance correcting stroke may also be, adjusted by changing' the' positionof theend of the connecting rod 141 in the slot 24tiof camleverl13'7 orby locating the other end of the rod manner-em opening in the'pawl'carrier arm 238. f" g I v l eferring'howparticularly to Fig. '9, the detector unit 5S' is arranged to energize thesolenoid'59 torelease the. latch'62 in order that theweb-advancingmechanism 143,

14$ n ay'elfecta further'advance' of the web 10 to correct the position of the web when said photo-sen sitivejdetector 58 is excited by'the reflective characteristics of the web from light to dark; The detector unit 58 may comprise any usual or preferred photo-sensitive control sys: tem adapted to concentrate a beam of light on the Web and arranged, to be excited by a rapid change in the reflective characteristics of the web upon which the beam. is concentrated, such as a, change from light to dark, as herein illustrated by the spaced registration marks. 12; When the detector unit 58 is excited, as above described, it is arranged to actuate relay 196 to close circuit 198 and energize-solenoid 59. In practice, the lightbeam continues to play upon theweb 10, but the relay 196 is actuated only for a predetermined period of time, hereincalled the scanningpe iqd.

Referring now to Figs. 9 and 10 in particular, the scanning period is controlled by the timing switch 60 which includes movable contact. 200vand stationary contact 202 mounted on an adjustable bracket 204. The movable contact 200 is normally urged toward contact 202 by leaf spring 201, the switch is operated to open and close a circuit 206 to the detector unit 58 in timed relation to the operation of the machine by a cam 208 fast on cam shaft 90, and a cooperating cam roller 210 is carried by an arm 212 pivotally mounted at 214. The arm 212 is provided with a lateral extension arranged to engage and rock movable contact arm 200 to open the circuit, 206, and a spring 216. is provided to urge the cam roller 210 against the cam 208.

Thus, the circuit 206 to the detector unit 58 is closed by the cam 208 to provide a scanning period during the web-advancing cycle, at which time the detector unit is rendered operative to energize the solenoid 59 when the light beam is intercepted by a registration mark 12. The time at which the scanning period commences may be varied by rotating the contact-carrying bracket 204 mounted for rotary movement on the switch cam shaft 90 and provided with arcuate slotted portion 218 at its outer end arranged to receive a nut and bolt 220 for fastening the bracket in its adjusted position.

In accordance with the present invention, the preferred characteristics of the detector unit 58 are such that if the light beam is in alignment with one of the dark registration marks 12 during the time that the time switch 60 is closed, thus indicating that the package sections are in registration within permissible tolerances, the relay 196 is not actuated. Also, if the light beam is directed on the registration mark 12 and then passes to a light portion of the web 10-, proper registration is indicated and the relay 196 not actuated. The only time that the detecting unit 58 is responsive to the moving Web 10 is when during the scanning period" the light beam strikes first a light portion of the web 10 and immediately thereafter strikes the dark registration mark 12. At this time the time-

switch contacts

200, 202 are closed and the detector unit 58 excited to actuate relay 196 closing circuit 198 to energize the solenoid 59. The solenoid in turn actuates the web-advancing mechanism to advance the web an additional increment to correct the position of the package-forming sections with relation to the container-forming and severing mechanisms to form commercially acceptable packages.

From the above description it will be seen that provision is made in the present apparatus for controlling the continuous advance of a printed web of containerforming material wherein successive containenforming sections are advanced into operative or registered position with relation to the adhesive-applying and websevering mechanisms of the machine, the present control mechanism being adapted to correct the linear advance of the web when a deviation from a predetermined position of a web section is detected at a predeterminedtime in a cycle of operation whereby to maintain the length of individual container-forming sections within predetermined tolerances. It will also be observed that the normal advance of the web may be adjusted in a simple and eflicient manner to accommodate various lengths of container-forming sections.

While the preferred embodiment of the invention has been herein illustrated and described, it will be under-v stood that the invention may be embodied in other forms within the scope of the following claims.

Having thus described the invention, what is claimed 1. In a container-forming machine of the type operating in cycles, in combination, adhesive-applying means comprising a roller for applying adhesive in a predetermined pattern onto, successive sections of a continuously advanced web, web-feeding means for continuously advancing a web having substantially equally spaced registration marks thereon defining successive container-forming sections comprising a pair of feed rolls normally arranged to continuously feed the web at a rate such as to advance the web a distance slightly less than a predetermined length of a container-forming section each cycle of operation, control means including means for detecting the position of a registration mark at a predetermined time during each cycle, and means responsive to said detecting means when a deviation from a predetermined position is detected for effecting a progressive movement of the feed rolls, to cause an additional increment of advance of the weband to provide a net advance of the web a distance slightly more than said predetermined length of a container-forming section during the cycle of operation in which such deviation is detected whereby to assure substantial registration of successive container-forming sections with saidadhesive-applying means, said adhesiveapplying roller being of a circumference slightly less than the predetermined length of a container-forming section and driven at a constant rate of speed and adapted to permit slippage of the web relative thereto when the web is advanced at variable speeds a distance greater than said circumference during a cycle ofoperation.

2. In acontainer-forming machine of the type operating in cycles, in combination, adhesive-applying means comprising a roller for applying adhesive in a predetermined pattern onto successive sections of a continuously advanced web, said roller being driven at a constant rate of speed, web-feeding means for continuously advancing a web having substantially equally spaced registration.

marks thereon defining successive container-forming sections comprising a pair of feed rolls normally arranged to continuously feed the web at a rate such as to advance the web a distance substantially less than a predetermined length of a container-forming section each cycle of operation, adjustable means for effecting a.

progressive movement of the feed rolls each cycle of operation to provide a normal advance of the web a.

distance slightly less than said predetermined length, control means including means for detecting the position of a registration mark at a predetermined time during each cycle, and means responsive to said detecting means when a deviation from a predetermined position is detected for effecting a second progressive movement of the feed rolls to provide a net advance of the web a distance slightly more than said predetermined length during the cycle in which said deviation is detected said adhesive-applying roller being arranged and adapted to permit slippage of the web relative thereto when the web is advanced at variable speeds during a cycle of operation.

3. In a container-formin g machine of the type operating in cycles, in, combination, adhesive-applying means comprising a roller for applying adhesive in a predetermined pattern onto successive sections of a continuously advanced web, web-feeding means for continuously advancing a web having substantially equally spaced registration marks thereon defining successive container-forming sections comprising a pair of feed rolls normally arranged to continuously feed the Web at a rate such as to advance the web a distance slightly less than a predetermined length of a container-forming section each cycleof operation, control means including means for detecting the position of a registration mark at a predetermined time during each cycle, and means responsive to said detecting means when a deviation from a predetermined position is detected for eflecting a progressive movement of the feed rolls to cause an additional increment of advance of the web and to provide net advance of the web a distance slightly more than said predetermined length of a container-forming section during the cycle of operation in which such deviation is detected whereby to assure substantial registration of successive container-forming sections with said adhesive-applying means, and driving means for said feed rolls including a differential drive having a normally stationary part for maintaining a normal driving connection to said feed rolls, said additional advancing means being arranged to move said normally stationary part a small increment to effect said additional advancing movement, said adhesive-applying roller being of a circumference slightly less than the predetermined length of a container-forming section and driven at a constant rate of speed and adapted to permit slippage of the web relative thereto when the web is advanced at variable speeds a distance greater than said circumference during a cycle of operation.

4. A container-forming mechanism as defined in claim 1 wherein the control means includes a normally inoperative photo-sensitive detector disposed beyond said feed rolls and arranged to cooperate with said registration marks, and a timing switch for rendering said detector operative to detect the position of a registration mark at a predetermined time in each cycle of operation.

5. In a container-forming machine of the type operating in cycles, in combination, adhesive-applying means comprising a roller for applying adhesive in a predetermined pattern onto successive sections of a continuously advanced web, web-feeding means for continuously advancing a web having substantially equally spaced registration marks thereon defining successive container-forming sections comprising a pair of feed rolls normally arranged to continuously feed the web at a rate such as to advance the web a distance substantially less than a predetermined length of a container-forming section each cycle of operation, adjustable means for effecting a progressive movement of the feed rolls each cycle of operation to provide a normal advance of the web slightly less than said predetermined length, control means including means for detecting the position of a registration mark at a predetermined time during each cycle, and means responsive to said detecting means for effecting a second progressive movement of the feed rolls to provide a net advance of the Web a distance slightly more than said predetermined length during the cycle in which said deviation is detected whereby to assure substantial registration of successive container-forming sections with said adhesive-applying means, said adhesive-applying roller being of a circumference slightly less than the predetermined length of a container-forming section and driven at a constant rate of speed and adapted to permit slippage of the web relative thereto when the web is advanced at variable speeds a distance greater than said circumference during a cycle of operation.

References Cited in the file of this patent UNITED STATES PATENTS 1,648,769 Hugo Nov. 8, 1927 1,898,723 Fuller Feb. 21, 1933 1,999,164 Avery Apr. 23, 1935 2,035,201 Smith et a1. Mar. 24, 1936 2,095,125 Cornock Oct. 5, 1937 2,147,223 Vergobbi Feb. 14, 1939 2,249,190 Thompson July 15, 1941 2,249,820 Gulliksen July 22, 1941 2,366,187 Friedwald Jan. 2, 1945 2,616,689 Baumgartner Nov. 4, 1952