US2373376A - Edge gluing machine - Google Patents

Description

4 sheets-sheet 1 O. S. BOLLING EDGE GLUING MACHINE Filed Feb. 20., 1942 April 10, 1945;

April 1o, 1945. s. 'BOLUNG 2,373,376

EDGE GLUING MACHINE Filed Feb. 2o, 1942 4 sheets-sheet 2 llllllllllllllllIlllllIIIII-Ill-Ill-I'Elllllji April l0, 1945. o. s. BOLLING EDGE GLUING MACHINE Filed Feb. 20, 1942 4 Sheets-Sheet 5 April 10, 1945. Q 5 BOLUNG 2,373,376

EDGE GLUING MACHINE largely be cracked loose from Patented Apr. 10, 1945 UNITED STATES itThNT OFFICE EDGE GLUIN G ll/IACHINE Implication February 2G, 1942, Serial No. 431,741

8 Claims.

My present invention provides an improved edge gluing machine especially designed and particularly adapted for applying glue to the edges of veneer strips and progressively forcing the glue-coated edges together and thereafter holding the same pressed together while the glue is hardening.

In the assembling and gluing or the strips, it is important that the glue-setting action should take place rapidly, and hence, in addition to the glue applying device or means, I provide a device for adding to the glue a hardener or catalyst, immediately after the glue has been applied to the edges of the veneer strips. By means of pressure rolls set on diverging angles, the edges of the veneer strips are forced together and held in tight contact under proper pressure during the glue-setting action.

In the act of pressing together the glue applied edges of the strips, surplus glue will be forced from between the edges. In edge gluing machines hitherto designed, the surplus glue would drop on and adhere to working parts of the machine and tend to gum up the machine and make removal of the surplus dried glue from the machine elements a difficult matter. Of course, accumulated dried glue on the machine `parts makes good work impossible. My present invention involves a highly important improvement on such prior machines and involves the use of one or more endless tapes which function to receive the surplus glue and carry the same from the machine. These tapes, because of thefunction they perform, I herein designate as wiper tapes. They are made of thin and very exible sheet metal tapes or ribbons that will receive the surplus glue that is squeezed from the glue joint and carry the same out of the machine. The glue will very quickly harden on these metal tapes but will have very slight cohesion thereto, will quickly dry and become so brittle that it may be easily removed by Scrapers or the like and, in fact, will the talles by the act of abruptly bending the tapes. l

These tapes are co-operatively arranged to work in connection with an endless feed belt, pressure devices and other co-operating elements, all as will hereinafter more fully appear.

The improved machine also involves other cooperating combinations which will also hereinafter more fully appear.

This improved machine, while especially designed for use in assembling thin veneer strips, may be used to assemble thicker wooden strips which, when glued together, will make a substanthe several views.

Referring to the drawings: y

Fig. 1 is a side elevation showing the improved machine;

Fig. 2 is an end elevation of the machine with some parts broken away loo-king at the machine in a direction from the left toward the right in respect to Fig. l;

Fig. 3 is a fragmentary view of the machine looking at the parts shown in a direction from the right toward the left in respect to Fig. l; Fig. 4 is a fragmentary view of parts shown at the left hand end of the machine illustrated in Fig. 1, some parts being sectioned and some parts being broken away;

Fig. 5 is a fragmentary view of the parts shown at the right hand end of the machine illustrated in Fig. 1, some parts being sectioned and some parts being broken away;

Fig. 6 is a plan view of the right hand end portion of the machine various parts being sectioned on the line 6 6 of Fig. 1 and some parts being broken away; and f Fig. 7 is a transverse vertical section taken on the line 'I-'I of Fig. 1.

All of the parts of the machine are supported directly or indirectly from a securely anchored pedestal I0 that is provided with a rigidly secured approximately C-shaped head II that forms a wide clearance passage I2. A horizontally eX- tended feed table I3 is rigidly secured to the pedestal IIJ underlying the extended arm of the head I l. The upper surface of this feed table I3,

as best shown in Fig. 2, is provided preferably with a horizontal projection or supplemental plate I4 that lies flush with the top of the table and is securely supported on the lower arm of said head. Feed table I3 is formed with a longitudinal channel I 5 in which are located electrically heated' rails I5 that rest on an insulating plate II.

Spaced above and extended horizontally overI the feed table is a shoe-supporting beam I 8 which is rigidly supported from the upper arm of the head I I by hanger posts Iiiy see particularly Fig. l, that are made vertically adjustable by suitable means.

Located directly above the channel I 5 of the feed table I3 and extending parallel therewith is an elongated heated shoe 22 that is supported from the shoe-supporting beam I8 and is made vertically adjustable by suitable means such as hanger bolts 23 thatwork through said beam, see particularly' Fig. 5. Nuts 24 working on the threaded upper ends of hanger bolts 23 limit the downward movements of said bolts, and hence, of the shoe 22, and coiled springs 25 on the lower ends of said bolts yieldingly press the shoe 22 downward as far as permitted by adjustment of the hanger bolts. 1

In Figj veneer strips, the edges of which are to be glued together, are indicated by dotted lines marked A and are there shown in close but slightly converging relation on the feed table positioned to be fed forward, that is, from the right toward the left on Figs. 1 and 6. Tofeed'the veneer strips with their adjacent edges longitudinally alongp'and centrally over the hot rails I6, there'i's provided an endless feed belt 26 which is made up 'of hingedly connected flat links very much like tractor tread chains. The upper portion of thi'sfeed chain 26 is arranged to 'run over lthe feed table and over the vrails i6 and'by-reference particularlyit'o 'Figl 7, it will be noted that the belts'or links'of this 'chain-run directlyon the rails I6 andiaiordacomplete solid support for the 4abutting edges of the strips A. l

At the delivery end of the feed tablethis vfeed chain'runs'overia sprocket wheel -21 Won 'a shaft 28, see particularly Figs, 1 and 4, that is journaled in 'suitable Abeari'rig's--on'the feed table and which is--pwerj-driven through connections to-be'hereinafter'noted; At Iilhefre'ceiv'ing end hof the ma'- chine, to wit: at the right hand end;'a's shown in Fig. `the feed ch`ain-runs -over-an idle guide sprocket '29 l'oh a shaft Sli-journaled in suitable bearings 'on thefeedtable.

VAAsti'i veneerfstrips 'are carried-forward bythe' feed `belt, "they are'forced" under pressure rolls 3 I set `in forwardly converging `.pairs so that they progressively force together `the Yedges vof the strips. -Thesefpr'essure rollsl, in-this particular machineareshown asjournaledtothe lower-ends ofplungers3`2 s'ee'particularly'Eig'7,'that extend upward through the beam- I B'andaremade vertical-ly 'adjustable' by stopV nuts "33. Mounted on 'the plungers 32 are split clamping collars 34 that -are sh'ownfas-provide'd withextended'armshaving upstanding pins 35 that work vertically in holes formed-inthe 'beam I8, see particularly lFigs. l,

4 and 7. Adjustments of the collars 315 on th'e plungers '32 will 'determine Ithe extent -of angularity of therolls 3l. The'laterally spaced or companion-plungers 32 are spanned -by a transverseypressur'e barf-S that rests V'on the split collars S4-andare*subject to coiled springs 31, the

tension 'of which-can be variedby suitable means which, as shown, `involves a pressure pin ASi) r'n'ounted to' move vertically-throughthe beam I8 a'n'd, iii-turn,` subject tothe arm rSil-of arockshaftll) `vjouri'ia'ledinea bearing'M lon the-beam l'. v'The rock-shaft @carries a number-of `the arms 39an'd Vis' provided with "a :tension ya'rirnA 42, the'fre'e 'end of 'whichis `adapted to beset under suitabley way-by vvifnoui'iting -fa' rod 45 in `a` bearing 46"or1theba`mi' I8; connectingfsai'd r'd tothe' 'depending arm ofsaid bell'- crank vland providing' said rod with a turn button 41 or the-like.

While the edges of the veneer strips are being forced together, but before they have been engaged, the glue must be applied to the abutting edges, and this may be and preferably is accomplished in a well-known way by means of a beveled and obliquely set rotary glue-applying wheel IIS shown only in Figs. 3 and 6, such as that fully disclosed in the patent to Victor Johnson and Charles Johnson No. '782,342 of dat'e February 14, 1905, and which roller would work in a glue pot 69, such as that more fully shown in the said prior patent.

In practice it has been found sufficient to apply the liquid glue ,to the edge only of the strips, and

hence, l-thesi'ngfleroller is sufficient for this purlSe Immediately after the glue has been applied to vthe`stripya"hardening fluid is applied thereto by means of a brush 5U positioned to spread the hardening liquid over the glue applied edge to accelerate. the setting action Vof the glue at a pointfiust-infadvance of the pressing oftheedges of the strips together. Tlus brush yEll viSv-'shown at' theopenl lower end of acontaining tube-)Elearriedeby the beam 'I8 Vand arranged to receive th`e liquidhardener from the -nipple'52 4of -a suitable container 53 shown as supported by a bracket-54 on thebe'am'I-S. V

vA vtubular'container 5I `is shown'as adjustably but rigidly secured, byfmeans of a splitcla'mp-ES, tofthe leg 56 of a pressureplate '51. This-leg is mounted for verticalmovements vin th`e`beam I8 and is yielding-lypressed ldownward-by acoiled spring 58,-seeparticularly Fig; 5. Extreme downwardumovements'of the leg 55 'and V`its-pressure plate 5'II-is limited-by 'av stop nut that works-on the threadedfupperend of'the/leg.

In addition to the obliquely'setvpressurerolls 3l, there isshown'an additional but-similarnitial :pair of pressurerollersa'i I v"and Aco-operati'ng suppbrts therefor, vwhich vlatter 'are ver-'yf similar tothe-supports described infconnection withsad rollers 3I-an'cl areindi'catedloy the fs'arii'e charactere with Ithe prune marks-*added thereto.

Located 'ne onTeach"sid'eof the centrallylocated 'formain shoe 2-2 are long hold-down'str'ips G'Utl'lat A fate sauklay Shes Kepfthe'l/enerst `p`s -A pressed "downfupo'nthe feed table `'3, '^se partiularlyFigs. 1, Zand l3. 'Tl'iesehold- 'downvs'tripsl orauxiliary shoes 60 are shown as Db'Vded upwardly ''ellen'ded Stellls k16| that work through lugs 62 on the sides of the' supporting be'aml. 'Coiled' springst?. on the sai'd 4stems yildingly press the auxiliary shoes' 6I) downwardly, 'as faras they are permitted to go, by 'stop nuts `64 on thethread'ed upper ends of said stems. The `vdownward pressure .put upon -the strips 60 may Vbey varied by adjustment ofnuts G5 Aon said stems.

Secured tothe shoe 22 and overlying the'abutchain 26 and causes the lubricating rolls to positively rotate.

In this preferred embodiment of the invention I employ two so-called wiping tapes, to wit: a lower tape and an upper tape. The lower endless tape is indicated by the numeral 14 and the upper tape is indicated by the numeral 15. Both of these tapes, as above stated, are preferably very thin and very flexible metal ribbons, preferably of spring steel. The horizontal upper portion of the lower tape 14 runs flush with the upper operative portion of the feed chain 25 and iits grooves or notches 26' that have sufficient frictional contact with the feed chain to cause this lower strip to travel with the operative portion of said feed chin. The notches 2B are probably best shown in Fig. '7. This endless tape 14, at the receiving and delivery ends of the machine, runs overv and with the feed chain over the sprockets 21 and 29; but said tape 14, in the arrangement shown, runs under and in contact with a tightening pulley 16 journaled on the extended end of an adjustable supporting arm 11 that is pivotally connected to the pedestal at 18.

' The upper endless tape 15 runs under the notched hold-down strip 66, runs over guide pulleys 19, 88 and 8|, and is caused to pass through or against slightly curved guide brackets or lugs 82 and 83. 'I'he guide lug 82 is shown as rigidly secured to and depending from the beam |8, while the curved guide lug or bracket 83 is secured to one end of the shoe 22. The guide pulley 19 is loosely journaled to the bracket 54 which, as before noted, is rigidly secured on top of the beam I8. l

The guide pulley 80 is shown as journaled to one end of a weighted lever 84 that is interu mediately pivoted to a bracket 85 on the top of the pedestal head The pulley 8| operates as a driving pulley to frictionally drive the upper wiper tape 15 in the direction of the arrow marked adjacent thereto on Fig. 1. This pulley 8|, as best shown in Figs. 1, 2 and 4, is carried by a shaft 86 journaled in the elbow of a bell-crank lever 81, the short arm of which is pivoted at 88 to a quite heavy bracket 89 which, in turn, is rigidly secured to one end of the beam I8. Shaft 86, at one end, is provided with a spur gear 99 that engages a smaller spur gear or pinion 9| on a short shaft 92 which is journaled in the extreme upper end of bracket 89 and provided with a friction wheel or drum 93 that presses the tape 15 into frictional contact with the wheel or pulley 8l. The frictional driving tension on the tape 15 can be varied by adjustment of a screw 94 applied to the depending end of the arm of bell-crank 81. A resilient block or pad 95 is preferably interposed between the end of screw 94 and the bracket 89.

Power for driving all of the moving lparts of the machine may be afforded by any suitable means such as an electric motor 95 supported from the pedestal I by a pivoted bracket 91. For the purpose of this case it may be sufficient to state that'through suitable driving connections of any kind, power will be transmitted to a shaft 98, see particularly Fig. 2, equipped with a sprocket wheel 99 which, through a sprocket chain |88 shown in Figs. 1 and 2, drives a sprocket |8| on the shaft 28. Shaft 28, it will be remembered, carries the feed chain driving sprocket 21. As shown in Fig. 2, this shaft 28 is a long shaft, the extended end of which is journaled in a bearing |82 .of a skeleton-like bracket |93, see particularly Figs. 1 and 2, that is rigidly secured to the' head of the pedestal |0 and extends toward the delivery end of the machine and is located in a position laterally offset from the feed belt. At its extended end, shaft 28 has a sprocket |84 over which runs a sprocket chain |95. Chain |85 runs over an upper sprocket |98 on one end of a stub shaft |01 journaled in the upper portion of frame-like bracket |03. Stub shaft |01 is connected to stub shaft 92, above described through a knuckle-jointed shaft |98.

To positively remove the dried glue from the tapes 14 and 15, blade-like Scrapers are employed. For scraping action on the lower` tape 14, I have shown a set of scraper blades |69 and an additional scraper blade H8, shown best in Figs. 1 and 2. Scraper blade H0 is shown as carried by a sleeve mounted on a xed stud ||2 projecting from the pedestal. By an anchor spring ||3, blade ||ll is frictionally but closely pressed against the tape14. The scraper blades |09 may be supported and spring-pressed in any suitable way but are preferably mounted like the scraper l0 on sleeves |4 that are mounted on studs l5 of a bearing flange H6 depending from the feed table.

Suitable Scrapers for the upper wiping tape 15 are best illustrated in Figs. l, 4 and 5, and in the particular structure illustrated for such purpose.

there is employed primary Scrapers H1 carried by sleeves H8 secured on stub shafts H9 eX- tended through and vjournaled in a flange of bracket 89 and at their extended ends subject to springs |29 that keep the scraper blades pressed against the upwardly moving portion of the upper tape 15. Beyond the pulley 19 there is preferably another scraper |2| carried by a springpressed sleeve |22 that is suitably pivoted to the bracket 54.

Operation The operation of the machine has probably been made quite clear from the description already rnade, but may. nevertheless, be advantageously summarized as follows: The link like feed belt 29 and the co-operating portions. of the wiping tapes or ribbons 14 and 15 will, by the driving connections illustrated and described, be driven in a direction to feed the veneer strips over the feed table in a direction from the right toward the left in respect to Fig. l: and the operative portions of the said elements 25. 1d and I5 will, as already stated, be driven at the same travelling or lineal speed.

As the diverging edges of the veneer strips A are fed forward, slightly beyond the initial pressure rollers 3|', the glue, by means of the wheel dii, will be applied to the edge of one of the strips; and immediately following this glue-applying action, the brush will apply the glue hardening material to the edge of one or both of the veneer strips. Under the action of the slightly coverging pressure rolls 3|, the edges 0f the veneer strips will be crowded tightly together and held tightly together during the glue hardening action which takes place within the machine and while the strips are being fed over the table. Under this continued forward movement the veneer strips will be engaged and pressed downward by the rollers 3| which work through the notches o1' openings in the hold-down plate'or strip 66 and the strips, during such action, will be fed under the said hold-down plate or strip. Under the above described forward movement of the veneer strips the drying of the glue will be accelerated Lby the :heat @applied .from the rails :t6 and shoes :22. f.

`Under ipressure :produced :by -vthe .frollersrsurplus' glue -will be :squeezed ffromzthe glue joint :and will be 'smeared Ionto for taken :up :by the foperai tive :portions ofthe 'endless tapes''lit :and ".15 and the gluecaught-bythesefltapeswwill quickly harden thereon and@ become :veryrbrtte .Asuthe-.tpapes FM and P15 .make abrupt turns 'at v.the delivery iend of the machine, ythe former, l.in passing over rthe sprocket 2i', iand :the latter passing through Ythe curved elbow :guide :'82, the hardened glue :will be cracked and :loosened @and rmuch :thereof :will iallfrom the tapesrbutthe-rscrapers Illlaaand ill will insure 'further removal fof fthe vglue iso .that the hardened `and iremovedlglue willi-drop .cutside oi :the machine :and may Vbe caughtaby suitable receptacie i or '-receptaclessnutishown. .zIn Fig. 'Le andiotherviews-described; ii any; hardened glue zstill Aremains ton'ILthe tapes :1:4 @and .fi :Latter passing the Scrapers iliig :and :l--l-l .it =will :be removed' by the: additionalrscrapers :H Sian-dA lil I yMeans f has already: been fully describei `wherebythe -shoe 122, with `v its -zapplied...hold-:down .plate 66, may be properly adjusted for theeproperespaoing and positioning of "tlie'parts; andfalso means has' "beentlescribed whereby the pressure on the rolls 3l v'mayfbe'readily varied'andadjusted. Of course the said Vshoe -22 andplat'e 456 will require vertical A'adjustments :to correspond 'to the thickness of .the'wooden strips that are to 'be edge glued.

The 'opening .4,2 in the U--sl'raped' head VI l iai'- for-dsfa 'wide space -southat'the'edge vgluing action maybe continued bythev successive-application'of strips "to the veneer sheet; and the .table-.lextension lll affordsfmeans ."fo-rsupporting a quite wide sheet made up of glued strips.

The hold-down strips'actL-as sort of auxiliary shoes for holding down the extended portions of the veneer strips while their inner'edges'arebeing glued'toget'her.

Themachine described isa complete self-'contained machine, 'all of the parts of `which are assembled on a common support or pedestal, and hence, capable of 'being set up and transported as a Acomplete device -with all of the fparts 4in cnerative' order.

VWhat I claimis:

l. "In a strip gluing machine, Aa "reed `table, an endless feed belt and'cooperatlvemeans `arranged tower-k over .sai'dtable and to lfeed strips into ed-gewise joining relation, meansforapplying glue ata placev betweenthe approachingedgesof the strips, and an endless `ilexible wiper tapemovable with Asaid feed'belt along Athe joint u'line between the strips and adaptedto `receive surplus glue and carryy the 'same out of the machine, @said feed belt being ma'de up of ljoined 'links and rsaid tape being a 'thin metallic lstrip, .said links having grooves in1which-said tape -isseated lin its operative movement with said feed belt.

ata placebetween the approaching edgesfofithe Y strips, 1 and an :endless .liexible Awiper tapefmovable l with said feed :belt along thejoint line .between the strips-fand adapted to .receive surplus glueand carry 'the samel outof theemachine, ,saidifee'belt being *power-driven andv said .tape being ,friction-Y ally ,carried therewith. y

3. LIn a stripgluingvtmachine, a-rfeed ,table,- .an endless .feed vbelt `and .cooperative vmeans-:arranged to 'Worknover said :table and `to feed '.stripsiinto edgewise joining relation, :.meansior applyinggiglue at a place between l.the f. approiachin-giedgesfof i the strips, and an endless. flexible @wiper tapes-movableV with said' feed belty .along the :joint ."line .between the E'strips and adapted .to receive `surplus gglueiand carry the same out .of the machine, asai'dffeed belt vvbeing made up vof metall-ic links,- :a-nd in furtherv combination with electrically?heated1 rails countersunk into said :feed rtablefand arranged to directly support tl'lemetallic'links` .ofsaidfbelt while they areoperative lto support the-stripseand to 'directly apply heat vto 1the glue ijoints offthe strips. 'f'

-4. -In -a Stripigluing-macliinaan endless zfee'd belt and 'cooperative means arranged to feed StripsintoedgeWiSe joining relation means for applying glueata place -between4 the approaching edges of the nstrips, andan endless .llexibletap'e movable with said belt along `the j'oint Yline rhetween the strips "and adapted yto lreceive'esurplus glue and carry the same out of thefmachinafsaid belt .being lpowerdriven andi said .tapef being frictionallyearried therewith.

5. Infra .strip gluing machine, means tarranged to yfeed edge glued strips tinto A.fedgewise .joining relationvzand moving the same through-.the machine in ethedirectionof Ythe jointlinexbetween the Sstrips,1-said means. including fan -zendless link feed belt. and an endless ilexible tape running over. the link feed. .belt along-.therjointflinebetween thexstrips andadapted to receive Isurplus glue-and carry the saine-out of: thefmachinefsaidf:Eeedfbelt being power-.fdrivenAz-and'said -tape beingffrietionallycarried-.therewith f Y. Y 1

f 6. .The structure dened'in claiml y.which hletreisuavsecond iiexible'ftape movable Awith the 7. The structure 7deiined .claim .5v-in `which lghrre is -a .second exible-.tape .movable with .the

e t. i Y

8. The .structure :defined inelaimc in Pwhich .the saidieedbelt ismade-ilp of joined linksand said feedtapeiis athinmetallic strip, -said links having groovesin v`which .said -tape'issseated in operative movement with theieed belt.

OSCAR .s. BOLLING.

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