[1]Patented July 27, 1943 29325,162 UNITED STATES PATENT OFFICE 2,325,162 COATING MACHINE Carl W. Goodwin, Plainfield, N. J., and Herbert G. V6re' Ja4ekson Heights, N. Y., assignors to American Seal-Hal) Corporation of Delaware, Wumington, De]., a corporation of Delaware Application May 19,1941, Serial No. 394,150 7 Claims. (Cl. 91-45) 'Me present invention relates to a machine for the feed mechanism for the adhesive spraying applying adhesive to partially preformed hood caps for milk botties or the like. One object of the present invention is to provide a new and improved machine of the above type. Another object is to provide a novel and improv6d machine for applying adhesive to the folds of the pleated skirts of partially preformed hood caps, so that these folds can be sealed 10 together during the bottle capping operation. Another object is to provide a novel and improved machine for applying an annular coating of adhesive on the lower portion of the'pleated skirt of a partially preformed hood cap. 15 Another object is to provide a novel and improved machine of the above type, which lends itself to adhesive applying operations on an efficient mass production basis.. Another object is to provide a novel and im- 20 proved maelilne of the above type, having means by which partially preformed hood caps, nested and arranged in stacks in a tray can be easily transferred as a batch from said tray to said machine for adhesive applying operations. 25 Another object Is to provide a novel and improved rnachine of the above type, having means by which stacks of nested caps, after being coated with adhesive as above indicated, may be easily transferred as a batch to a tray for storage or 23 shipment, Various other objects and advantages of the invention will be apparent from the following particular description, and from an Inspection of the accompanying drawings, in which 3.5 Mg. 1 is a fragmentary side elevation of the upper part of an adhesive applying machine embodying the present invention, said machine being shown with parts broken away, and with 40 stacks of nested caps in operative position ready to be coated with adhesive. Mg. 2 is a top plan view of a portion of the machine taken on line 2-2 of Fig. 1, and shown without the caps to be coated. 45 Flg. 3 is a section taken on line 3-3 of Fig. 2, showing stacks of nested caps in position to be adhesively coated. Mg. 4 is a section taken on line 4-4 of Fig. 2, showing stacks of nested caps in position to be 50 coated, and also showing the adhesive spraying device. Mg. 5 is a section taken on line 5-5 of Fig. 4, but on a larger scale. Mg. 6 is a top plan view of one end portion of 55 device. Mg. 7 is a top plan view of a rack by which stacks of preformed nested caps can be transferred as a batch to and from the adhesive applying machine Mg. 8 is a transverse section of a cap supporting tray, shown in conjunction with a rack by which the stacks of nested caps can be trarisferred as a batch from said.tray to the adhesive applying machine. Mg. 9 is an end view of a stack of nested caps in the process of receiving adhesive tlirough a spray nozzle. Fig. 10 is an elevational view of a stack of riested caps, taken along line 10-10 of Mg. 9 and shown In the process of being sprayed with adhesive and Fig. I @ is a top plan view of the stack of nested caps in the process of being sprayed with adhesive. The machine of the present invention is shown applied to preformed hood caps 10, made from disc blanks of suitable water resistant material, such as paper, having form sustaining rigidity to permit creasing and shaping. The blanks are partially 'preformed in a suitable forming press such as shown in the copendingapplication of Goodwin and Martin, Ser. No. 390,468 for FormIng press (SX-26), to provide a depressed central bore closing portion I I (Figs. 9, 10 and 11), adapted tc) enter snugly lnt(> the bore of a bottle, such as the conventional milk bottle, and to seat on an internal ledge thereof, an annular pouring lip housing 12 of channel-shaped cross-section, joined to the central bore closing portion I I and adapted to extend over the pouring lip of the bottle, and an outer flared depending skirt 14. The skirt i 4 is formed with a plurality of substantiallk triangular folds or , pleats 15, which extend outwardly beyond the pouring lip housing 12, and which are adapted t(> be folded downwardly around the outer surface of a bottle iieck upon contraction of said skirt. A disc 16 may be seated within the bore closing portion I I to impart additional strength and rigidity thereto, and to facilitate the seating of said portion on the internal ledge of the bottle. After the caps 10 have been shaped and preformed as described, they are stacked and nested as shovm in Figs. 9, 10 and 11, with the outer Portions IT of the skirts 14 exposed and with the line of nested pleats 15 extending helically around the stack of caps. These stacks A are CII stored in this condition on a , 'vided tray 20 as
[2]2 shown In Plg. 8, until such times as they are transferred to the machine of the present invention for the purpose of applying adhesive to the folds of the pleated skirts 14 of the cap, so that these folds can be sealed together during bottle capping operations. The tray 20 Is preferably of wooden construction, and domprises a pair of side bars 2 1, interconnected by a pair of end bars 22 to form an open rectangular frame. A series of parallel transversely spaced grid bars 23 extend between and are connected to the end frame bars 22, and a pair of bars 24 are secured to and extend along the side frame bars 21 respectively. Two of the stacks A of nested caps IC are seated on and between adjoining bars 23 and 24 on the sides respectively Gf the tray 20, wnle the other intermediate stack@ A are seated on and between adjoining grid bars 23. Each of the side frame bars 21 is shown PrOvided along one edge with a channel 27 of semicircular cross-section, and along the other edge with a ridge 28 of corresponding cross-section, to permit stacking of the trays 20, and to lock the stacked trays against relative horizontal movement by the interengagement of the ridges 28 and channels 27 of adjoining trays 20. As a feature of the present invention, the adhesive applying machine is constructed to permit expeditious transfer of the stacks of nested caps IC as a batch to arid from said machine, without substantially disturbing the relative positions of said stacks. For that purpose, there is provided a transfer rack 30, which Is preferably of metal, and wl-Ach comi)rises a pair of parallel end pieces 3 1, interconnected by para.Uel side pieces 32, to form an open rectangular frame substantially coextensive in outline with the outer frame of the tray 20. Each of these end pieces 31 is. in the shape of a zig-zag bar, having a series of upwardly offset triangular sections $3, separated by straight horizontal sections 34 to form a series of stack receiving recesses 35 dividing the rack 30 in'Tlo compartments. The recesses 35 of one 4,'ra.nie bar 3 A E3.,Ye lp- registry 'with the correspondi.n@. recesses 15 of the other frame bar 31 to receive the end sectiois o-L each stack A in see,,'@ng e.n.f@ageinent vvitb- t7.1-e base sectio.-L--, E4, a-,id upside sectioils 33 of regi-,tering recesses, a-ild -are spaced to correspoiad @Lc, the spacing c),@ -'the stac@ks A -Aii tfie tra-ys 20. Brace rods '3 a -n the toi:-n o@ a7@i--,Ie l@-or-s axterd be'L,%@reen the tw@, -_Iram,- bars,7,! ii). seatinq, engageni-ent vjith the apices a-, the Ltor sectionc; 13, a,-id- are se,@tired. tie-t etc v7e'@d@ng or the 'kike. .1r. @ran@sferring @lIL' stadks froir, t'@ie ZO to adqcs@@,e ap:,@13-,ing -nachine tei be desrri:oed., the i:2@ck -'-,s 4--.-ivezted cl,@er the ti-ay@ 2C 9,,%- shov,,ii @n lvlig. 8, ar.@d. loii7e.red lir@til t'rie sid@-, @rarr-e bal--s 32 rz@c'@t ,Ie -cst or- thi;, si.de fra,rc, e bars @ i of sp,ld tray 2,,@. iii @Iiiis pos,"tior. of tA-@e rs-ek C-6, the s@Llac,ks A v),", exte,-qd i-n@o t!,:ie recesses 35 of salid ack ZL@. --E'rc- 29, and rfck 3C are then ;ntogeL.'.,xer -,nd posltic--,-ked on 't@.he ad'-Vlcz;ive app',,yi.ii.,- machiiie --s sho,.,7n i.-t Fi@-. 5, &.nd as the 'aa rclc@rp, -.@iLIly deccrilied hereinritey to depos,@il s,4,,@7-zp,ks A on zaid -qiaciiiiie, -47,te I-"fair 20 i-s thei-@- ,,nd reinoi,,ed, the tra7,isfe,@ rack BE@ is e r "aiil-ec on t.ne inar@bi-iie to perra,.t @sy re-tra,@isfer of Tvho',Ie ba4lch of stacks as a, unit to thc@- t-ray z@ or suta7rji-. afte-- the plr--tio-a of the adh-,sive @,ppiyii'@g operaticr,. The zLi-)-IjlYiil,- O.'L '@he pres@-.-,t 'lo2i comprises a s4-an,3. 6B, hD,@,-@@,ig @ n,-ir O;i@ front. uprigi@6s 4 @ and s, pair of rea)7 ti@r,-ights t] 2, Interconnected Into a rigid supporting structure by swtable bracing members 45. The rear up-, rights 42 extend a substantial distance above the front uprights 41 to support the operating parts of the machine in inclined position as will be more fully described. A frame 44 is suppgrted in an upwardly and rearwardly Inclined position on a frame holder 45, flxed to the stand 40. This frome holder 45 lo is shown as an open rectangular structure, having its border or side members 46 in the form of angle irons, with inwardly extending marginal flanges 47 along their upper edges for seating the frame 44. The frame holder 45 has its front end 15 extending snugly between the front uprights 41 and secured to the upper ends thereof by suitable means, shown as bolts 49. The rear end of the frame holder 45 extending snugly between the rear uprights 42, Is raised abdve the front end anci 20 is secured to said rear uprights 42 by swtable means, for Instance bolts 50. The frame holder 45 will be incllned upwardly and rearwardly at a convenient angle as shown. To the forwatd lower end of the frame holder 45 Is secured a plate 5 1, extending above the upper edge of said frame holder 45 to form a stop or seat for the lower front edge of the frame 44. The frame 44 comprises a pair of side bars 54, interconnected by a, pair of end bars 55 to form 30 a rectangular open frame structure. This frame 44 is substantially co-extensive in outline to the frame holder 45, and is seated on said frameholder 45 with its front forward edge abutting the stop plate 51 as shown in Figs. 1, 3 and 4, so that said frame 44 is inclined upwardly and rearwardly, as above mentioned. The frame 44 is fixed to the frame holder 45 in this inclined position by suitable means, such as bolts (not shown), passing through brackets (not sho,.vn) 40 on said frame 44 and through the marginal flanges 67 of the frame holder 45. For seating the rack 30 in proper positit)n in the frame 44, each of the side bars 54 of said frame has secured to the inner side thereof a 45 pair of inclined brackets 56, shown in t@ne form of angle irons having mar.-ii-ial rack suppoi,tiiig '@langes 57, extendiric., inwardly @irom 'Crie -L@ppe,P-dges thereof. TI-iese two braci@:e@s 3,ri are .qy a substantially rectangulal-@ Icecess 'a iri 'ulie 5o side bar 5(,, extendip.,- froi-" the -@ipper ed,-c- of -said bar and ser-ving as a to receive @tlie operator's h?,,nd, ,7h-ij,(, tll,,e -.,-@,.ck is being IoNT,,e-zed into t]-ie f--;L@re i'-@ie lo-%Te-.@ ends of tl,.-ie cL@- sLi-ppo-,-+ n, fi@@,-Iges ST of the two lower brackets are titi,i-te@7t iip-.@@Tardly at riff-h@. aiigles '@o aaid qayige,@ Lo stops or sea;ts 60 for the rack 3D a,, sho-,@,i-@. -n Fi @-. 1. Rot2.tab,@y supportled on tlle fraire 44 i-,; a of sdaced paraliel -inel,@ned rails 6E, @,lhich 1-,a-fuu '@,'ally suppo2:,' the stacl?-,z of caos, and "i;-iieh I rleo,,-ially driv-- sad stacks at high spepd, Ea,,@h ese @ . 0-f tn -o',Is 65 eci-@iprises a metal ti).be cj'a iiito v;h4ch is press fitted at its upper rear crid. the ;35 -eddeed end C7 of a. bearing mez,,I'oer A fl,,tz,.ge IP; o@r- th@. bee@ri,-ig ir-ember 39 abi:tts ',he unp,-,,., rear edffe of the tube 66 aiid pre-jects rad-io.,Ily ou-'L,-7ia.-dly beycnd ti-ie outer perip4liery of sq-1 d t,,,ibe 0 6. T'qe 'u-pper reer section of @,lie beari,,-,ig memTo ber aC, is in the form of a, cylindrical block coc@-@tensive in diarrie,@ley @@,i-th that of tho rla.-i.-e 7@3, and axially spac,,d from sa3ld -iqangc- iO liy -,Lr) @nter@-Ded@a@Le reduced sectlon 72 of s,@i,-i be@L-Y--'@iig member 69 for t-he -,rilirpose to be described., '15 A roll locking spirldle 75 exte,@ids into an axjat
[3]Vire 76 in the block 71, and passes through a bushing 77, having a reduced end press fitted into the rear end wall 55 of the frame 44. The lower forward end of the spindle 75, extending into the bore 76 of the block I 1, Is of reduced diameter to form an axlttlly facing annular shoulder 7 8, which bears against the block 7 1, to Bmit the axial position of said spindle 75 with respect to said block. The rear end 80 of the spindle 75 is knurled to afford a rough gripping'surface by which said spindle 75 may be manually pulled outwardly to release the corresponding roll 05. A collar 85 is press fitted in the lower front end of each tube 66, and serves as a bushing for a drive shaft 86 splined thereto by any suitable means, shown as a Woodruff key, to permit axial movement of said tube 66 out of drive engagement with said shaft 86. This drive shaft 86 is journalled in a bearing $7, pressed fltted in an opening in the lower front end wall 55 of the frame 44, and is formed with a cylindrical enlargement or boss 88 for the purpose to be described. For driving the rolls 65, a main drive shaft 95 is supported on bearings 96, fixed to the lowe!r front wall 55 of the frame 44, and carries a series of helical gears 97 meshing with helical gears 98 fixed to the shafts 86 respectively. In order to drive the main shaft 95, there is provided a motor 100 (Mg. 1), supported on a platform 101 between the stand uprights 41 and 4T, and rotating the main shaft 95 through a suitable speed reduction drive. This drive is shown ccrmprising a comparatively large pulley 102 driven by a belt 103 from a smaller pulley 184 on the shaft of the motor 100. A comparatively large ptilley 105 on the main drive shaft 95 is driven by a belt 106 from a smaller pulley 107 on the shaft of the pulley 102. To permit easy cleaning of the rolls 65, and tO increase the effectiveness of their peripheries for friction drive engagement with the stacks A of caps, an easily removable paper tube I IO is fltted tightly over each of the metal tubes 66 to rotate with said tube 66. TWs paper tube I IO abuts the flange 70 on the corresponding bearing member 68, and has an outside diameter equal to that of said flange 70, so that the outer peripheries of said paper tube II 0 and said flange 70 are substantially flush. When it is desired to replace a used paper tube 1 10 by a fresh one, the corresponding spindle 75 is pulled rearwardly out of the block 79 of the bear-@'ng member 68 to release the respective roll 65. This roll 65 is then slid axially rearwardly out of engagement with th6 drive shaft 86, and lifted transversely out of the frame 44. After the used paper tube I IO has been replaced by a fresh one, the roll 65 is lowered in the frame 44, slipped over the shaft 86, and locked in axial positi-:)n by the spindle 75. For holding the ends of the stacks A in proper axial position on the frame 44, there is provided a series of inclined spindles 120 at the lower front end of said frame 44 arranged above and in staggered relationship with respect to the rolls 65, and a series of inclined spindles 121 at the upper rear end of said frame 44 in axial registry with respective spindles 920. Each of the lower spindles 120 is journalled in suitable anti-friction bearings mounted in a bearing block 122, which Is shown fixed to the front lower wall 55 of the, frame 44 by bolts 123. The upper rear end of each spindle 120 is f(>rmed with a cylindrical stack holder or chuck 124, Provlded with an annular rim 125 ad;apted to engage the inner surface of the top wall of the pouring Up housing 12 of the lower end cap of the stack A, as shown in Fig. 3. To meet sanitary requirements, the diameter and depth of this rim 125 Is such, that no part of the stack holder or chuck 124 comes in contact with any part of the lower end cap of the stack A, which might extend into the interior of lo a bottle when sealed thereon. A collar or cylindrical enlargement 126 on the spindle 120 has a peripheral engagement with the cylindrical enlargements 88 on the two drive shafts 86 adjoinlng said spindle 120 on 15 opposite sides thereof, so that said spindle 120 is frictionally driven from said shafts 86. Each of the upper rear spiridles 121 is journalled In anti-friction bearings mounted in a bearing block 130, shown flxed to the rear upper 20 wall 55 of the frame 44 by bolts 131. Press fltted or otherwise fixed to the lower end of each spindle 12 i is a stack holder or chuck 132, formed with a recess 133 to receive the upper end cap of the stack A. This end cap extends 25 only partfally Into the recess 133, so tl,.at the outer skirt portion i7 of this cap is exposed to receive the adhesive as will be deserlbed. The upper stdck holders or chucks 132 are axially movable to perrnit the deposit of each stack A between a pair of aligned holders o'n' chu 30 , eks 124 and 132 for adhesive applying operation,'and to permit the removal of said stack from between said holders or chucks 124 and 132 at the completion of said operation. For that pur35 pose each of the upper spindles 121 is axia)ly slidable in it@ bearing bloelc 130, and has afflxed to its upper rear end a collar 135, by mthich said spindle 121 can be axially pulled outwardly. Means for outwardly shifting the upper spin40 dles 121 in unison includes a rock shaft 136, journalled in brackets 137 flxed to the upper end of the frame 44. A series of shifter levers 140 are fixed at one end to the rock shafi 136, and are forked at their other ends 141 to re45 ceive the respective spindles -121. When the rock shaft 136 is rotated clockwise (Figs. 3 and 4), the forked ends 141 of the shifter levers 940 engaging respective collars 135 shift the spindles 121 axially outwardly in unison to move the @o stack holciers 132 alsa'axially upwardly and rearwardly in the position shown in Fig. 2. In order to rotate th6 rock shaft 136 for the operationdescribed, there is provided an arm 143, fixed at one end to said rock shaft 136, 55 and pivotally connected at its other end t,) one end of a link 144. This link 144 extends obliquely downwardly and forwardly along one side of the frame 44 on the outer side of the stand 40, and is pivotally connected at its lower fr,)nt end 60 at 145 to an intermediate section of a crank handle 146, which is pivotally supported at one I end on one of the front bolts 49 connectinl-l the frame holder 45 to the stand 40. In normal Inactive Position shovrn in full lines 65 in Flgs. 3 and 4, the crank handle 146 extends obliquely upwardly substantially at ri@bt angles to the plane of inclination of the frarne 44. To shift the upper stack holder or chuck @32 obliquely upwardly, the crank handle 146 4 swung 70 forwardly to the position shown In full lines in Fig. 2 and in dot and dash lines B in Fig. 4. In this position, the crank,handle 146 will be past the center line of the lfnk 144, so that the uPPer stack holders br chucks 132 will be @ locked 7.5 in their upper,sudable position until such times
[4]4 2,325,162 as the crank handle 148 Is returned to the posltion indicated in full lines In Mgs. 3 and 4. For depositing stacks A in the frame 44, after the rack 30 has been inverted over the tray 20 as previously described and shown In Mg. 8, and the assembly reinverted so that the stacks A rest in the recesses 35 of said rack 30, the assembly is lowered in inclined position into the frame 44, whue the upper rear spindles 12i are in their uppermost position as a Tesult of the forward operation 'of the crank handle ISS. After the assembly of the rack 30 and tray 20 has been lowered to proper positlon in the frame 44, this assembly is shifted obliquely downwardly and forwardly to slide the straight base sections 34 of the front end bar SI of the irack 30 underneath the lower spindles 120, until tWs front bar 31 rests against the end stops 60 on the brackets 56. The rack 30 is then rested on the flanges 57 of the brackets 56. In this position of the iiiek 30, the stacks A will be in axial alignment with respective pairs of axiauy aligned spindles 120 and 12 1, the front end bar 31 of the rack 30 wiU be seat-ed against the stop 60 and wiU extend in the recesses formed between the front lower ends of the tubes 65 and the enlargements 88 on the drive shafts BE, and the rear end bar 31 of said rack 30 wil'i extend in the recesses formed arolind the rectuced sections 72 of the bearing members 68. After the rack 30 has been seated in the proper position described, the inverted tray 20 is lifted and removed, and the crank handle 146 is retuimed to the position indicated in full lines to release the upper spindles 12 1. Tlae stack holders or chucks 132 on these spindles 121 are heavy, and their axial inclination such, that when the spindles 121 are released, they will gravitate obliquely forwardly and downwardly in positi-on to enga-e the upper ends of respective stacks A as shgwn in Figs. 1, 3 and 4. The weighted character. of the upper spindles 121 also serves to maintain the stacks A under axial compression during rotation of said stacks, so that the caps in each stack are retained in proper nested position during adhesive applying operation. The stacks A resting on the rolls 65 will be frictionauy driven thereby at high speed. The peripheral surface interengagement between the cylindrical enlargements 126 on the spindles 120 and the cylindrical enlargements 88 on the drive shafts 85 will assist in frictionally driving these stacks. If desired, these enlargements 88 and 126 may be eliminated, and the rous 65 depended on entirely to frictionally drive the stacks. For applying the adhesive onto the stacks A as these stacks are rotated in the frame 44, there is provided a spray device comprising a series of spray nozzles 150, each adapted to operate on a respective stack of caps. These spray nozzles 150 are connected to a ma-nifold I 5 1, which in turn is connected to a suitable supply of adhesive by a flexible conduit 152. Suitable air pipes 153 deliver the necessary air pressure to the adhesive to force said adhesive in spray form onto the rotating surfaces of the stacks A. Each of the ndzzles ISO is pi-eferably designed to eject a spray 155, fanned out in the shape of a thin extencled layer as shovin in Figs. 9, 10 and 11. The Tiozzle 150 preferably extends obliquely dovinivardly -with the a,,is C of said nozzle 150 disposed above the axis of the stack as shown in Mg. 9, and the spray 155 should preferqbly be posi'uioned and shaped to enter into the inner ,Olds I 56 of -the rotating skirt pleats i 5. To reach these Inner folds 158, the plane of the spray desirably extends substantiary parabel to the helical line of nested Pleats 15 indicated approximateiy by the line D-D. In this way the spray is driven into the inner folds 156 of -the caps as the stack of caps Is r.Dtated, and is caused to adhere particulsrly to the portions of the caps wldch are to be folded over for securing the saine on the bottle. The spray 155 also forms a com10 plete band of adhesive on. the outer exposed portions 17 of the skirts 14 of the nested caps. The nozzles 150 may be of any well known type, such as that of the DeVilbiss type, in which the shape, size and angle of the spray 155 Is adjusted. 15 Although the desirable position and shape of the spray I 55 has been described, i-t is to be considered tnat these may vary in accordance with the particular adhesive used and with the particular requirements of any specific case. 20 Any suitable adhesive may be used, such as an isomerized rubber composition known as Plic)lite, or other thermoplastic adhesives having a low seali ng,temperature, as set forth in the copending application of Herbert G. Vore, Ser. No. 391,125 for Bottle cap and method of making the same (SK-28). In order to move the series of nozzles 150 along their respective stacks, the ends of the manifold 151 have secured thereto eDlIars 160, th-readed 30 oli a Pair of parallel lead screws IS 1, which are journalled in bearings 162 supported on the upper ends of the stand uprights 42. These lead srrews 161 exterid obliquely parallel to the fran-ie 44, and are positioned outwardly beyond the sides 9:-, thereof to permit free movement of the rack 30 towards and away from the frame 44. A motor 163 for driving these lead screws I GI is supported on a bracket 164 flxed to the stand uprights 42. A speed reduction transmission between the 40 motor 163 and the lead screws 161 includes a shaft (67, driven froni the motor 163, and gears 168, fixed to said shaft 167 and meshing with helical gears i7D fixed to the ends of the feed screws 16 1. 45 The motor 163 may be controlled from a manually operabie switch 165, and rnay be of the reversible type tD ef,'ect reversal of the feed screws IS 1, and return movement of the nozzles I 50 into elevated position after they have reached the end r)( of their oblique dovmward stroke. During this return movernent of the nozzles 150, the spraying of adhesive on the caps may be cdntinued, or if desired, the supply of adhesive may be discontinued at the erid of their downivard forward 55 stroke to shut off the spraying operation. In the specific form show-n, the return movement of the nozzles 150 is effected automatically, and the motor 163 shut off automatically at the end of a complete spraying cycle. For that pilr6( pose there is provided a motor etit-off switch 175 of the push-button spring-pressed type at tlle rear upper end of the machine, and a reversing switch 176 of the push-button snap type at the front lower end of the machine. Dogs 177 and 65 178 rigid with olle of the leaci screw collars 16G a@e adapted to operate the switches 175 and 176 respectively at the e,-Id of each stroke. The Lipper svvitch 175 opens when engaged by the dog 177 tc> shut off the motor 163 and closes - when Yeleased 70 to rotate the rnotor 163 in one direction. e manual snvitch (65 when closed short circuits the upper switch 175. When this manual switch 165 is closed the motor 163 is started and the nozzles 150 moved oblicluely down7 r) wardly and forwardly from their rearward
[5]elevated position. The switch 165 may be of the spring-pressed type, so that when it is released it 'will open. The initial dqwnward movement of the nozzles 150 under control of the switch 165 releases the switch 175, so that this switch is closed and the downward and forward movement of the nozzles 150 continued. When the nozzles 150 reach the end of their downward forward stroke, the dog 178 operates the switch 176 and thereby reverses the motor 163, so that the nozzles 150 return towards their rearward elevated position. When the nozzles 150 reach this elevated position, the ' dog 177 engaging the switch 175 opens the switch and thereby shuts off the motor 163. Suitable means may be provided if desir6d to aut@matically shut off the spray when the nozzles 150 have reached their elevated position. Before starting another spraying cycle, the reversing switch 176 can be manually pushed to rest6rd it to its fonner position for the next downward forward movement of the nozzles 150, or automatic means, such as relay or solenoid means, may be provided to effect this restoration when the nozzles have reached their elevated position at the end of the spraying cycle. After the completion of the adhesive spraying operation, the crank handle 146 is moved forwardly from the position shown in full lines in Mg. 4 to the dot and dash position B shown to shift the upper spindles 121 rearwardly, so that the stacks A are released from engagement with the upper stack holders 1'32. An empty tray 20 is T-hen inverted over the stacks in the frame and in position to receive the stacks between adjoining grid bars 23 and 24. The rack 30 with the inverted tray 20 is then lifted from the frame 44 and the assembly inverted, so that the trays 20 will be in the position shown'in F@-. 8 with stacks A resting on the grid bars 9R an@ 24. These trays 20 can then be stacked and stored. As many changes could be made in the above apparatus, and many apparently widely different ernbodinients of this invention could be made without departing from the scope of the claims, it is intended that all matter contained in the above description or shown in the accompanying drawin-s shall be interpreted as illustrative and not in a limiting sense. Vv-hat is
