US 2859727 A
Description (OCR text may contain errors)
Nov. 11, 195s s. R. PHIN E r AL GLUIG DEVICE FOR BOX FORM'ING MACHINES Fild July 31. 195s 4 Sheets-Sheet l I NVENTORS SIDNEY R PH/N Nov. 11, 1958 s. R. PHIN ETAL GLUING DEVICE FOR Box FORMING MACHINES Filed July 51, 1953 4 Sheets-Sheet 2 INVENTURS Wo/vn ,ci` PH//v FRED KEMP/ ER Nov. 11, 1 958 v syn. PH\|N' ETAL' 2,859,727
GLUING DEVICE FOR Box FoRuING MACHINES 4Filed July :51. 1953 J 4 sheets-sheet s INV ENTRS S/DNY R. PH/N 3 /t/ Ffrfo lvM/LER Nov. 11, 1958 s. R. PHlN ET AL 2,859,727
GLUING DEVICE FOR BOX FORMING MACHINES Filed July 31, 1953 4 Sheets-Sheet 4 .Elfi-11- INVENTORS SID/v5 y R. PH//v ,00W :MTW
United States Patent GLUING DEVICE FOR BOX FQRMING MACHINES Sidney R. Phin and Fred Kempler, Toronto,
Ontario, Canada Application July 31, 1953, Serial No. 371,499
2 Claims. (Cl. 118-3) This invention relates to improvements in carton or box forming machines or the like in which a blank is folded and glued into carton-forming relation.
The principal object of the invention is to provide a machine of this class which will be simpler and more eicient in operation and maintenance 'than present machines.
Another important object is to provide .a machine which will give a continuous carton forming operation for quantity production and which can be quickly and easily adjusted to different carton or box sizes.
Still another object is to provide a machine which will ensure that the folded adhesive carrying parts are held in contact for complete bond therebetween.
In present machines, wherein glue is to be applied to a ap of a carton forming or other blank, it is conventional to employ a glue pot and a distributing roller or equivalent element which carries the glue to the surface to which it is to be applied.
Such arrangements particularly are a considerable source of annoyance and require a great deal of maintenance. It is usually for instance when an emulsion type glue is used to clean the glue pot at the end of each days operation and each part in contact with the glue must also be cleaned.
In addition, during operation the glue is very readily splashed or thrown about by the distribution roller or is applied too heavily and becomes smeared on adjoining components, leading to very undesirable gumming and dirty conditions existing in and around the machine.
It is therefore more specically an object of the invention to eliminate the untidiness and attendant diiculties of the conventional machines and to provide for the application of the glue without requiring constant or frequent cleaning of the glue applying mechanism.
Again another object is to eliminate the need of continually moving parts operating in the glue as presently required.
Still another object is to provide a machine wherein the glue application will automatically be adapted to suit the size of flaps being glued without any adjustment of the machine and without any danger of the glue being deposited beyond the ap and upon any underlying support surface.
The principal feature of the invention resides in the provision of a glue applying mechanism responsive to the presence of a carton blank part to discharge glue thereon but not therebeyond and providing a carrier mechanism to carry the blank in a manner to bring the parts thereof to receive the glue into cooperative relation with the glue applying mechanism.
More specifically, according to the invention the glue applying mechanism comprises a substantially sealed or air-tight gluing unit delivering glue to an applying head containing a plurality of valve controlled discharge orices, the valving of the orifices being effected by the passage thereby of a carton blank part to effect a dis- 'ice charge of glue on the blank part while otherwise maintaining the glue in a non-hardening owable state sealed from the atmosphere.
A further important feature resides in folding the previously glued parts, flaps or portions to be adhered into desired contacting carton-forming relation and applying a continuing pressure on such glued portions for a period suflicient to enable the bond between the portions to at least initially set.
Still a further feature resides in applying such pressure while the carton is continuously progressing through the machine to provide a Icontinuously operating machine.
More specifically, according to the invention the blank I in glued and folded state is delivered into a collapsible tunnel while carried on a mandrel, the walls of the tunnel resiliently applying pressure to the folded carton parts to firmly maintain same in folded relation to allow the glue to set while the carton travels through the tunnel.
Still another feature resides in moving the carton from blank to finished carton stages by means of mandrels carried on a continuously operating carrier and providing folder mechanisms acting to fold the blank to carton form by virtue of the blank movement.
Still another feature resides in mounting the co-operating parts of the feeding, gluing and tunnel pressure mechanisms for relative separation to accommodate a varying range of cartons and removably mounting the mandrels on which the blanks and cartons are carried through the machine for ready replacement.
Again another feature resides in the provision of a positively acting delivery mechanism arranged to deliver an individual blank in the path of each advancing mandrel on the carrier and providing guides, including the tunnel, to correctly position the blank relative to the mandrel until the advance of same conforms the blank to carton form in mandrel-enclosing relation, and providing positive means to discharge the formed carton from the mandrel.
Referring to the drawings, Figure l is a side elevational view of a machine constructed in accordance with the invention.
Figure 2 is a plan view of the machine.
Figure 3 is an enlarged fragmentary part vertical section and part side elevational view showing the gluing mechanism and the carton blank about to be fed thereto.
Figure 4 is a view similar to Figure 3.
Figure 5 is a View showing a further step of folding the blank after gluing, the gluing mechanism being broken away. l
Figure 6 shows a still further advancement of the carton with parts broken away.
Figure 7 is a plan view of a blank such as may be formed in the machine.
Figure 8 is an enlarged fragmentary plan view partly broken away of the machine and the gluing station.
Figure 9 is an enlarged fragmentary vertical sectional detail taken at the gluing station showing a blank having an adhesive applied thereto.
Figure l0 is an enlarged fragmentary vertical sectional detail showing the operation of the gluing mechanism.
Figure ll isan end elevational view of the machine with part of the cover and base broken away.
Figure 12 is an enlarged vertical section through the machine showing the extensible tunnel through which the glued and folded blank is carried.
Figure 13 is a part side elevational, part vertical sectional view of the glue-applying mechanism, and Figure l4 is an underside plan View of the glue-applying mechanism.
Figure 15 is a fragmentary plan detail of a slightly modified form of tunnel for use with heat scalable blanks,
Referring to Figures `1, 11 and 12, the machine is provided with a base 1 which .carries longitudinal side rails 2 between which are mounted cross braces 3, Figure 11, carrying spaced brackets 4.
Extending longitudinally of the machine between the brackets 4 are railsv 5 which .support an endless .chaintype conveyor 6, the links of which `carry plates '7. The conveyor 6 is threaded around sprocket wheels 8 and 9 journalled at the ends of the side rails 2 on axles 10 extending transversely across the machine. The sprocket Wheel 9 is operated by a suitable drive 11 connected to a motor 12.
The plates 7 of the chain are arranged to operate beneath suitable angle guards 13, Figures ll and 12, and suitable cover plates 14 are ,mounted on the bracket portions 4 of the .cross braces to conceal the chain mechanism.
Mounted on the bracketsl 4 ,and extending longitudinally of the machine are Z -shaped sections 15 which are spaced apart at their inner edges and are adjustably separable by means of bolts 16 operating in slots 17 .in the brackets 4.
Mounted for vertical adjustment on the side walls lof the Z members 15 are uprights 18 provided adjacent their upper ends with vertical slots 19, Figure 12. Slidable in the slots 19 are tongues 20 of support brackets 21 which may be clamped in any position of vertical adjustment within the slots 19 as clamped by the bolts 22.
Each of` the Z-shaped members 15, uprights 18 and support brackets 21 carry resiliently mounted plates comprising the bottom plates 23, side plates 24 and top plates 25 which combine to form a tunnel configuration extending longitudinally of the machine, which tunnel is made larger or smaller by adjustment of the Z members 15 and the support brackets 21.
The mounting of vthe plates 23, 24 and 25 is carried out by supporting them on bolts or pins 26 which have heads 27, limiting separation of the plates 23, 24 and 25 from their opposing support members and slidable through Ithe opposing support members to decrease the plate separation therefrom. Springs 28 are employed to maintain the plates, urged inwardly towards their inner limits of movement.
Removably mounted on the plates 7 of the chain conveyor are goosenecks 29 carrying mandrels 30 movably mounted thereon, and, as shown particularly in Figure 12, the gooseneck extends up between the cover platesV 14, Z members 15 and bottom plates 23 to carry the mandrel 30 about which the carton blank '31 is adapted to be .formed through the tunnel.
Mounted for vertical adjustment ahead of the tunnel, constituted `by the plates 23 to v25, is a magazine 32 adapted to receive a supply of blanks 31, the mounting of the magazine herein shown comprising telescopic supports 33. The magazine is formed of two half sections 34 which are adapted to be spread as the size of blank 31 is changed.
The bottom support surface presented by the sections 34 of the magazine are linclined towards the forward end `of the machine, and the `plate 35, carried from a sleeve 36 forming an axle housing for weighted `rollers 37, 'bears against the carton blank supply under weight of the rollers to positively advance the blanks down the magazine towards the forward end.
A lip or projection 38, Figures 2 and 3, is provided at the lower end of the magazine at each side thereof to block the path of the lowermost blank to hold the blank stack in the magazine under the pressure of the plate 35.
As shown in Figures 1, 2 and particularly Figure 1l, the machine is provided with a pair of posts '39, one at each side of 'the machine and extending upwardly from the rails 2 vin advance ofthe magazine 32. A cross head 40, having end bosses 41 through which the posts are received, is adapted to slide on and be guided by Y vices are connected to the vacuum source.
'4 the posts. A cross bar 42 is secured to the tops of the posts, and rotatably Asupported thereby are a pair of threaded spindles 43 which pass through the cross head engaging suitable nut members 44 carried by the cross head.
The spindles 43 are linked together by a sprocket chain 45 meshing with sprockets 46 carried by the spindles, and a hand wheel 47 is provided on one of the spindles to effect rotation thereof and the other spindle through the sprocket drive 45 and 46 to operate the cross head 40 vertically on the posts 39.
Reciprocably mounted on the cross head 40 to reciprocate longitudinally of the machine is a slide 48 operating through a guide 49. A spring 50 secured between the slide and guide operates to urge the slide forwardly towards the magazine.
Mounted on a shaft 51 is a cam 52 engaging a roller 53 carried by the slide 48. The shaft 51 is driven by a sprocket chain 54 meshing with a Vsprocket wheel 55 carried by the co-nveyor shaft or axle 10, sprocket wheel 56 on shaft 51 and adjustable sprocket 57, `which is adjustable to accommodate the vertical travel of the cross head 40.
ICarried on a cross bar 58 at ,the end of the slide 48 are a pair -of suction devices 59 connected by a llexible hose 6l) through a valve 61 to a suction pump not shown. Mounted on the slide 43 is an arm 62 which is adapted to strike a spring-loaded trip arm 63 to open the valve 61 to cut olf suction from the suction devices 59 through the valve 61. Thus under rotation -of the shaft 51 the slide 48 is allowed to advance towards the magazine under action of the spring 50 to bring the suction devices 59 against `the lowermost carton blank, while the suction de- Then upon continued shaft rotation the cam 52, acting against the roller 53, forces the slide to retreat from the magazine 1and the grip of the suction `devices 59 will be sufficient to cause the blank to ilex and clear the retaining lips 38, and the blank will be carried free of the magazine yuntil the slide arm 62 strikes the trip arm 63 of the valve .61., cutting off suction and releasing the blank, as particularly shown in Figure 3.
Arranged beneath the ysuction devices 59 Vat the end of their travel away from the magazine, as shown in Figure 3, are guides 64 somewhat on the shape of a V which form spaced troughs 65 to receive the lowermost edge of the blank 31 which has ljust been dropped Vby the suction devices and guided into the trough by end guides 64'.
The forward portion of the Vguide 64 and an end por-y tion of registering guides 84, and indicated at 66, servev to hold the blank in a generally upright position -in the trough 65.
A blank such as may be folded and glued in the machine is shown in Figure 7 and comprises a bottom panel 67 and sidepanels 68 separated by score lines 69. The bottom panel has end iiaps 70 and the side panels have end aps 71. For the sake of simplicity the blank is shown without cover llaps or panels, and it will be understood that the machine is in no :way limited to the handling of cartons to be formed from the particular blank illustrated which serves merely to facilitate an understanding of the machine operation.
The forward movement of mandrel 30 causes the 'blank to 'be engaged by the forward registering portions 66 of plates '84 which portions enter the notches 72 between the flaps 7), 71 to correctly register or align the blank with the tunnel 23, 24 and 25 and to separate the flaps 71 from the iiaps 70. Continued movement of the mandrel then causes the tunnel to fold over the side panel-s 68.
Mounted on each side of the machine for vertical adjustment are gluing devices 73 and their associated assemblies. In the illustration each of the gluingdevices 73 is mounted for vertical adjustment on a post 74, two sets of gluing `devices `being `arranged on each side of the machine on a common post.
As best shown in Figures 10,' 13 and 14, each gluing device has a hollow glue-receiving chamber 75 formed at the end of a clamp arm 76. A plurality of bosses 77 extend downwardly from one face of the device and terminate in discharge orifices 78 (see particularly Figure l).
Mounted within the bosses '77 are ball valves 79 which are'urged to close the discharge orices 78 under action of springs 80 bearing against ananchor'ring or plate 81.
-Leading into the chamber 75 is an inlet 82 while the base of the chamber opposite the bosses 77 is closed by a cap S3.
Associated with each of the gluing devices 73 and adjustable therewith on its post 74 is the plate 84 extending longitudinally of the machine and formed with perforatio-ns S adapted to register with the bosses 77, and according to the spacing of a plate 84 from its associated gluing device, the ball valve 79 may enter or lie immediately above the perforations.
`Secured to but spaced slightly from the plate 84, approximately the thickness of the material forming the end flaps 71 of the side panels 68, is a cut-away guide plate 86 having a curved portion 87 curving away from the associated plate 84.
As the mandrel 30' advances the blank the end flaps 70, projecting from the bottom panel, and the end aps 71 projecting from the side panels, which have been separated by the plates $4, are shown in the sequence of operation, Figures 3 to 5, and are shown in Figures 9 and l0.
The curved portions 87 of the guide plates 86 are contacted by the flaps 71 as the mandrel continues to move and are guided thereby down firmly against the perforated portions S5 of the plates 84 and are carried between these latter plates and the discharge heads of the gluing 4devices constituted by the bosses 77, discharge orifices 73 and ball valves 79.
The material of the iiaps 71 causes the balls 79 to move inwardly in their bosses 77, causing the orifices '78 to be opened.
Mounted on a suitable support bracket SS above the tunnel, constituted by the plates 23, 24 and 25, is a container 89 adapted to receive a substantial quantity of glue,
- and this glue is fed to the reservoirs at the individual `gluing devices constituted by the chamber '75 through tiexible tubing 90, Figure l.
The main reservoir or glue container 89 is provided with a removable cap 90, Figure l, through which its charge may be introduced, and a small hand pump 92 is provided to enable compressed air to be delivered into the container through a small check valve 93, pressure being indicated at 94.
It will be understood that the gluing system comprising the gluing devices 73, the reservoir S9 and the tiexible connections 90 therebetween is a sealed system, maintaining the glue free from drying and contamination by exposure to the atmosphere.
The glue in the system thus maintains a substantially uniform viscosity for an indefinite period until it is dispensed by the end iiaps 71 operating the ball valves 79, allowing a measure of the glue to escape until the flap has moved past the respective bal-l valves actuated thereby, at which time the springs S0 return the ball valves to their seated position closing the discharge orifices 73.
With this arrangement the gluing mechanism requires practically no attention and does not require the constant cleaning and attention of conventional gluing mechanisms.
Since glue is dispensed only during the interval the ball valve, controlling the orice through which dispensing is taking place, is contacted by the iiap, the glue application occurs only when the ap is present to receive the glue. As a result the associated parts do not become coated and there is no continuously moving member or mechanism required by the system.
In addition to the fact that glue is dispensed only when there is a flap present to reoeive it, the gluing mechanism enables aps of all different sizes and shapes to be effectively glued. That is, the gluing devices each present a plurality of discharge orifices 78 each operating independently to discharge glue when a iiap surface is presented thereagainst. Thus for a certain shape of flap a certain portion only of the orifices will effect a discharge, whereas with a different shape of flap contacting further of ball valves 79, other of the orifices will also effect a glue discharge. Y
The gluing devices 73 and their associated guide plates 84 and 86 are relatively adjustable vertically in accordance with the vertical adjustments of the top plates 25 of the tunnel, and they may be swung about their vertical adjustments for lateral adjustment by means of the clamp arms 76 to accommodatethe separation of the bottom and top plates 23 and 25 respectively to suit the size of carton blank being glued and folded.
Following advancement of the carton blank 31 past the gluing station the movement of -the mandrel, about which the blank is partly formed, causesit to strike a pair of lever arms 95, Figures 3 to 6 and 8 and 9, pivoted respectively on the top and bottom plates 2S and 23 of the tunnel. These levers have folder linger portions 96 which move against the restraining inuence of springs 97 to turn the previously glued flaps 71 of the side panels downwardly, while the flaps 70 of the bottom panel of the blank have moved freely between the opposed pairs of gluing devices 73 and are still in the plane'of the bottom panel 67.
Following the inturning or folding of the glued flaps 71 the blank is advanced to bring the end flaps 70 against a pair of curved guide plates 98 carried by the side Walls 24 of the tunnel. These guide plates turn in the end aps 70 forcing them against the glue-carrying surfaces of the previously folded end flaps 71.
Journalled on the side walls 24 of the tunnel are a plurality of rollers 99 which engage the folded end aps as the mandrel 30 carries the folded blank past the guide plates 98. These rollers exert pressure against the folded aps forcing them against the ends of the mandrel as the mandrel and folded blank forces the tunnel to expand laterally against the force of the springs 28. Once the mandrel has moved past the rollers 99 the side walls 24 will spring inwardly and co-operate with the bottom and top walls 23 and 25 of the extensible tunnel to press the folded blank about the mandrel to maintain the parts or aps firmly in their folded relation for a distinct interval of time sufiicient to enable the adhesive to begin its initial set.
Mounted at the rearward end of the machine on suitable brackets 100 are a pair of spaced vertical cylinders 101 preferably having a rubber or friction coating presenting a series of projecting feet 102. These cylinders 101 are driven through a bevelled gear drive 103 and a chain drive 104 from the sprocket shaft 10, and their peripheral velocity is arranged to be in excess of the linear velocity of the mandrels 30 but moving at a point adjacent the mandrels in the same direction. Thus as the glued and folded carton blanks 31 arrive at the end of the machine they are engaged at each end of the mandrel by the feet 102 of the higher speed rollers 99, and the rollers are arranged to apply sufficient friction through the feet 102 to whisk the formed carton blank olf the mandrel, discharging it outwardly beyond the end of the machine for collection.
The operation of the machine is briefly as follows:
The set-up of the machine is first adjusted to suit the particular size of carton to be handled. This adjustment will include adjusting the telescopic tunnel constituted vby the plates 23, 24 and 2S to present a tunnel section corresponding to the shape of the carton being formed but of slightly smaller dimensions when the plates are urged inwardly to their innermost positions by the springs 28. Next, the mandrel 30 is selected to correspond to the desired carton size and the setting of the tunnel.
7 Next the magazine is spread and elevated as required atida quantity of 'blanks 31 introduced. Then the crossltead is vertically' adjusted to suit the position of the i me, and the sprocket wheel 57 is adjusted to take .slackinchainl l f, hfefrnachin'e has been idle kfor an extended period the' ball valves 79 may be rst manually operated to ensure' thatthey are free, and pressure may be applied to the glu'eiinthe reservoir 89 if 'necessary by the hand pump 9,2. The rnachinevis then ready for operation.
I'`Thefnotor 12 isV then started to start the conveyor 6 to oper e the `mandrels 30 past the gluing station and thro theresiliently expansible tunnel. In proper timingv e slidel 48'will ble advanced to bring the suction devices? against the lowerrnost blank 31 in the magazine 3,2 j, d suction Willbe yapplied to enable the devices 59 tdpick u"p`andV withdraw/,this carton blank. Then as the ca ier continues slide v48 is reciprocated until the blank 7 legistryfabove the fguidef64, whereupon the arm 62 o tftlretslide operates the trip arm 63 to cut off the suction to lthfe `deyi :es 59 and the blank is dropped into the trough 65 14n front of an' advancing mandrel. The mandrel op'- g between the'guides64 then pushes the blank bethe Vblank registering plate ends 6,6 and into the tunnel t`o yfoldthe side panelsf68`of the blank. down against the, top and bottom surfaces respectively of the mandrel, while the end'ii'aps 70 and 7,1 remain in the same plane asfthe panels 67 and 6 8 to Which they are attached respectively.
The further advancement of the 4conveyor causes the end'iia'ps' 70 tocontinue between ythe spaced opposed plates'84 associated with the gluing devices 73' at each side ofthe machine, while the end flaps ill ride above and below the upper and lower plates 84 respectively at each side. Continued movement of the conveyor causes the, end flaps 71 to` engage beneath the curved portions 87 o'ftheguide plates 86 to b e guided thereby flat against the plates.; S4' atthe pointsywhere these flaps enter the gluing zone, at which points the plates 84 are perforated as indicated at 85.
The'aps' 71' then cam the ball valves 79, which they contact, inwardly during the interval they'are advanced between these ball valves and the perforated plate portions 85. i Thespherical surface of the ball valves will pferrnitthem to be cammed into the body of the gluing devices even though they may be projected down into thfe perforations 85.
"During the interval the ball valves are cammed inwardly/"the glue,which has been Vsealed against drying and contamination by the atmosphere, is delivered through thev oriticvesl'78' and onto theflaps, and immediately the ap has.pass ed'one ball yvalve itwill automatically close linderaction of the spring 80`to shut olf glue flow, preventingiglue'frorn being applied'to adjacent parts.
VIn theY event the glue is particularly thin or of low viscosity any'tendency to drip before the ball is firmly seated willi'be looked after by the perforations $5, and there will be no'surfaces opposing the bosses 77 and dischargel orifices 78`to be coated and require cleaning.
Asthe carton yis moved past the gluing station the lever armsf`95`are operated by the mandrel to swing the folder fingers'V '96C downwardly to tuck in the end flaps 7l to whichfthel glue has just been applied.
lNext,l the guide platesl 98 turn in the end flaps 70 to overlie'th'e turned-in aps 7l and further movement of the carrier, causes the rollers 99 to exert a considerable rollingpr'essure, forcing the folded aps 70y and 7l against the ends o'f the mandrel to ensure a firm pressure betweenthe 'liaps 70 and 7i. to Venable an intimate bond therebetweento be initiated.
"'Uponfcontinued, movement ofthe conveyor the blank Will'be' resilie'ritl-y held against the,A walls of the mandrel inftheir itirnate'folded relation as the tunnelV is actuated tocollapsebove the mandrel by action ofthe springs 28.
The length Aof the tunnel constituted by the plates 23 to 25 is such as to enable at least a preliminary setting of the adhesive to be obtained, and as the mandrel emerges from the tunnel the glued, folded and adhered end flaps V and 71 are engaged by the friction cylinders T01 and whisked off the mandrel to be collected for use. it will be appreciated that such a machine will be highly efficient as it provides for the continuous gluing, folding and pressing of the blanks without interruption of the movement of the blanks through the machine.
In addition, it will-be appreciated that the machine will be clean and there will be no wastage or throwing of the glue or missed flaps as the blanks are fed past the gluing station, and the care of the machine frornrthe standpoint of cleaning parts or members of the glueapplying assembly and the need for frequent glue replacement is eliminated.
lt will also be understood that such a machine is fully adjustable and that the gluing device will be self-adjusting to accommodate the particular flap area to which it is desired to apply glue.
Where the blanks are formed of waxed material then the tunnel can be heated by suitable heaters to augment the cohesion of the folded and overlapping blank naps.
Where heat is applied, as shown in Figure l5, the rollers 99 carry a belt 106 of silicon impregnated libre glass held under tension by spring loaded rollers 107. The belt is contacted by the carton 3l and moves freely with the carton so that there is no friction on the folded carton flaps as the heat is transferred thereto through the belt. With this arrangement the heated wax is not smeared nor is printing, etc., on the end flaps smeared or spoiled.
The specific details of construction may of course be varied, and it will be understood that such variations of construction fall within the scope of the appended claims.
What we claim as our invention is:
l. In a carton forming machine or the like, blank feeding means, a gluing unit comprising a sealed container adapted to receive a quantity of glue, a glue applying head having a plurality of discharge passages terminating in discharge oriiices, passage means leading from said container to said head, a plurality of spring-loaded balls arranged in said discharge passages and normally closing said discharge orices and partially projecting therebeyond, and perforated plate means adjacent to said head and having the perforations thereof registering with said balls, said perforated plate means being adapted to guide a blankvpart to be glued against at least certain of said balls to force same inwardly of said discharge orifices to open their discharge passages effecting a glue discharge therethrough onto such blank part.
2. A gluing mechanism comprising a glue container sealing a reservoir of glue from the atmosphere, and a distributing head in communication with said reservoir, said distributing head having a plurality of discharge passages therein terminating in discharge orifices, rotary valve means each comprising a spring loaded ball arranged within each of said passages and normally closing said orilices and projecting through said orifices beyond said head, and a perforated plate located adjacent to but spaced from said head with t'ne perforations thereof in register with said balls.
References Cited in the le of this patent UNITED` STATES PATENTS 1,163,651 Flynt Dec. 14, 1915 1,496,726 Myhrum June 3, 1924 1,647,072 Bergstein Oct. 25, 1927 1,957,613l Richard May 8, 1934 2,000,325 Ford et al May 7, 1935 (Otherreferences on followingpage) 9 UNITED STATES PATENTS Platt Feb. 8, 1938 Shelvin Apr. 5, 1938 Richard Aug. l, 1939 Leach Dec. 12, 1939 5 Nissen Mar. 5, 1940 10 Richard July 2, 1940 Carruth Jan. 7, 1941 Wells May 20, 1947 Zanetti Dec. 12, 1950 Pasotti Sept. 2, 1952