US2342307A

US2342307A - Spraying machine

Info

Publication number: US2342307A
Application number: US451801A
Authority: US
Inventors: William A Smith
Original assignee: Ohio Brass Co
Current assignee: Ohio Brass Co
Priority date: 1942-07-21
Filing date: 1942-07-21
Publication date: 1944-02-22
Anticipated expiration: 1961-02-22

Description

Feb. 22, 1944.

W. A. SMITH SPRAYING MACHINE Filed July 2l, 1942 IIIIIElIIII` t M1 a2 Imuil :8

,a f @n 6 Sheets-Sheet l lill-l lll Snuentor MLLMM A. SMITH nu f KQeq,

Gttorneg Feb. 22, 1944.

W. A. SMITH SPRAYING MACHINE Filed July 2l, 1942 6 Sheets-Sheet 2 lwentor J'l/IfLLMM SMITH Feb. z2, 1944. Y W, A, SMWH A 2,342,307*A SPRAYING MACHINE Filed July 2l,` 1942 6 ASheets-Shes?l 3 Snventor WILLMM SMITH (Itter-neg Feb. 22, 1944. w. A. SMITH 2,342,307

SPRAYING MACHINE Filed July 2l, 1942 6 Sheets-Sheet 4 :inventor WILLMM H. SMITH @ttor-1mg Feb. 22, 1944. 4 w. A. SMITH 2,342,307

SPRAYING MACHINE Filed July 2l, 1942 6 Sheets-Sheet 5 MLLMM SMITH Gttorncg nnentor Feb. 22, 1944. w, A.A SMITH SPRAYING MACHINE 6 Sheets-Sheet 6 Filed July 21, 1942 fa; 1.5i

:inventor WILLIAM H. SMITI; B f( (Ittorncg Patented Feb. 22, 1944 r Z UNITED STATES PATENT OFFICE 2,342,307 SPRAYING MACHINE William A. Smith, Akron, Ohio, assigner to The Ohio Brass Company, Mansfield, Ohio, a corpo-` ration of New Jersey Application July 21, 1942, Serial No. 451,801

22 Claims. l(Cl. 91-45) This invention concerns spraying machines and ing drawings sets forth a preferred embodiment in its more speciiic aspects is particularly diof the invention but such disclosure is not to be rected to a device whereby selected areas of a Vconstrued as a limitation of the invention which given work piece have a coating applied thereto. is limited only by the appended claims and any The object of this invention is to construct a and all modications, alterations and variations spraying machine in which selected area-s of an of structure coming within the spirit and scope insulator have a conducting coating applied hereof are deemed Ato be included herein.

thereto. In the drawings: I

Another object of the invention is toprovide Fig. 1 shows a front elevational view of a maa spraying machine having an indexable work chine incorporating the invention. table on which a plurality of rotatable Work Fig. 2 shows a view taken along the line 2-2 oi holder spindles are mounted. Fig. 1.

A further object of the invention is to con- Fig. 3 shows a detail of the work rotating struct a machine for spraying specially prepared spindle. coatings on selected areas of an insulator which Fig. 4 shows an enlarged detail of the indexing is adapted to successively index Work pieces past mechanism.

a plurality of spray nozzles and which provides Fig. 5 shows a detail of one of the tilting mechmechanism for rapidly rotating the work piece anisms for one of the guns.

when it is stationed adjacent the nozzles. i Fig. 6 shows an elevational detail of one of Another and further object of the invention is 20 the spray guns with parts in section.

to provide a spray machine for coating selected Fig. 7 shows a schematic detail of the spray areas of awork piece; which includes mechanism system and its organization with respect to a for spraying only at such instances when the Work piece.

indexable table is at rest and the work holder is l Figs. 8-11, inclusive, show the progressive rotating and which shuts off the source of presmovement of the indexing device through a cycle sure fluid to the spray needle operating chamber of operation.

when the work table is indexing. Fig. 12 shows a schematic elevational detail of Another and further object of the invention the power transmitting mechanism and its conis to provide a mechanism that will pivot or verf, nection with the table devices. tically move a selected spray gun in timed re- Fig. 13 shows a plan view of the Work table. lation with the indexing of a work table. Fig. 14 shows a plan view of a modification of Another and still further object of the inventhe glazing compound agitating and pressure tion is to provide an improved indexing and lockmechanism with parts in section to show detail. ing mechanism for a spray machine. Fig. 15 shows a side elevational view of the Another and still further object of the invenagitating mechanism with parts in section. tion is to provide a simplied transmission for Fig. 16 shows a detailed elevational View of the a spray machine that incorporates awork spinpressure head mechanism. die drive adapted to rotate the work spindle only Fig. 17 shows a schematic elevational view of when it is the direct range of the spray nozzles. the mechanism. i i

Another and further object of the invention is 4.o Fig. 18 shows a panel and control mechanism to provide mechanism for keeping the coating or for the device. glazing mixture supply to the nozzles under a The utilization of conducting glazers on variconstant head and which is further adapted to ous types of insulators, such as are now currently be characterized by the fact that such coating or in use in the art, requires that those conducting glazing mixture or compound is kept in a state coatings, which are usually characterized as of of agitation and circulation a comparatively high resistance, must be applied,

Other objects are to reduce cost and time of in order that they shall accomplish their most applying a conducting coating to insulators, to effective purpose, to certain areas of the insulator increase the quality of the ultimate product, inor Work piece. Generally speaking, such areas crease production and eliminate tedious and unare adjacent tothe `region of contact between reliable manual operations. different'materials or areas influenced by the Other and further objects of the invention will shape of the insulator itself. By use of the high occur to those skilled in the arts to which this resistance conducting glaze, there is a redistrinvention pertains as the description proceeds bution of the electrostatic field created at regions which taken in connection with the accompanywhich would otherwise be electrically overthat extends almost entirely around the outside or periphery of the wheel 25 and over a portion of the periphery it is cut away as at 39a more particularly illustrated in the several views of the drawing referred to. The cam arm 3| integrally associated with 25 has a roller 32 supported thereon at an appropriate distance from the center of the shaft 24 that is intended to selectively engage one of the slots 28 for rotating or indexing the table I3 and its associated work holders. The Geneva indexing construction just described serves a dual function of not only indexing the work table I 3 but by reason of the arrangement of the rollers 29 and the peripheral flange 30 locks the table I3 during the period of rest. eral views 8, 9, III and II illustrate the course of movement of the slotted wheel 21 and the cam wheel 25 with its cam arm 3| and the flange 3|). Fig. 8 shows the position of the wheels just prior to the commencing of an indexing operation and it will be noted at this point that the roller 32 of cam arm 3| is about to enter one of the slots 28. As soon as the roller 32 has entered the slot 28, it will begin to rotate the shaft I I and when in the position of Fig. 9 the roller 29 that is on the succeeding segment will pass inside of the flange 39 through opening 30a in substantially the posi- `tion shown in the said figure and upon continued rotation of the wheel 25 to the position shown in Fig. 10, then the roller 29 that was Within the flange 25 initially is about to leave the inside position through opening 30a and be arranged externally of the flange 3U. The two positions just described show that the cam arm 3| will be below the center line connecting the shafts II and 24 or to one side thereof asthe one roller 29 is about to enter the inside position of the flange and when the preceding roller 29 is about to leave the interior of the flange 30 the roller 32 will be above or to the other side of the line connecting the centers of the respective shafts II and 24 or of the wheels I and 25. Fig. 11 shows the position of the elements III and as soon as the indexing operation is complete and further illustrates that two of the rollers 29 function to lock the wheel I0 against an unintentional rotation. It should :be observed in this figure that the two rollers engage the external surface of the flange 39 and the rotating movement of the wheel 25 will cause the

engaging rollers

29, 29 to rotate but there can Ibe no rotation of the element I0 until the next indexing movement is initiated by reason of the roller 32 engaging with the succeeding slot 28. In view of the foregoing it should be evident that a simplified compact mechanism has r been provided that will positively index the table I3 and during the rest periods thereof, the flange cooperating with the

rollers

29, 29 that engage therewith will cause the shaft II and its associated table I3 to be held in a locked relationship.

As previously indicated, the table I3 is provided with a plurality of work holders I4, here shown as six in number corresponding to the number of slots 28 in the Geneva wheel element 21. Each of the work holder elements I4 is freely and rotatably mounted in the work table I3 and comprises a dished element 34 that supports an anti-friction bearing 35. Disposed within the bearing 35 is a tubular element 36 that extends above the surface of the table I3 and has a flange portion 31 thereon in which is supported a plurality of rubber or resilient work holder devices 38, appropriately secured to the flange portion 31. Intermediate supports or spacers as shown ln Fig. 7 may be provided if desired bec The sevlll tween the elements 38 and the flange 31 but the foregoing constitutes the essential devices. The element 36 is preferably tubular in form and the center of the entire assembly is cored out so that the interior of the insulator supported thereon may be exposed to a nozzle arranged concentrically of the tubular element 36. The work table I3 is fixed to a flange 39 supported on shaft II and secured thereto by a plurality of cap screws 40. Interposed in this mechanism is a plain sleeve bearing 4I that rotates relatively of the shaft or support I2. The tubular element 36 at its lower end constitutes a belt pulley 33 that periodically comes into engagement with the belt 41 to rotate the work holder assembly I4.

Mounted on the plate 3 is a driving motor 42 that has fixed thereto a gear mechanism` 43 adapted to rotate a pulley 44 whose axis is transverse to the axis of the armature shaft of motor 42. On the opposite side of the plate 3 there is a column or support 45 that rotatably mounts a pulley 46. The pulley 44 is connected to pulley 46 by means of a belt 41. The belt 41 is adapted to engage with pulley 33 formed on the element 36 of the work holder I4 as set forth above. The plate 3 is :further provided with a column 48 that has a lever arm 49 pivotally mounted thereon supporting an idler pulley 59 that engages the belt 41. A spring 5I has its one end fixed to the arm 49 and its opposite end is adjustably secured to the plate 3 on an appropriate bracket mechanism by an adjustable screw means whose function is that of keeping the belt 41 taut. Each of the work holders I4 and its pulley 33 is indexed successively past the operating station and is engaged by the belt 41, is rotated thereby and during this period of rotation the preselected surfaces of the work piece or insulator have the conducting glazed coating applied thereto. 'I'he principal function of the belt tightener arrangement 49, 50, and 5I is to keep the belt 41 in tension during such times when the belt 41 is not engaging the pulley 33 formed on one of the work holder elements I4. It should be apparent therefore that the Work holder I4 is rotated only at such times when anyone given work holder mechanism I4 is in direct engagement with the belt 41. By reason of the belt tightener arrangement just described when there is no Work holder in engagement with the belt 41, it will not because of looseness become disengaged from the

pulley elements

46 and 44.

It has been previously stated that the conducting glaze solution is applied to the preselected areas of the insulator for given periods of time and these given periods of time are those instances in which the work holder cornes into engagement with the work holder rotating means just described. Mechanism has been provided that operates in a timed relationship with the rotation of the work holder whereby a conducting glaze coating is applied to the said preselected areas or surfaces of the insulator. This mechanism originates in an adjustable cam device 52 secured to shaft 24. The adjustable cam 52 is composed of two

plates

53 and 54. They are adjustable relative to each other and each of the plates is provided with a plurality of

apertures

53a and 54a that are so disposed in the plates such that any two of them, one above one in each plate, will be in registration with each other and in which some form of cap-screw or bolt, preferably a blind or flush screw, is arranged to hold the two plates 53'and 54 in adjusted relationship. It should be apparent that the time in which the lnozzles hereinafter' set forth are open-is determined by the adjusted lpositions of the lobe portions ofthe

elements

53 and 54 of the cam 52. Since the cam 52 is xed on to the shaft 2d, there is `a constant rotation of the cam and for that reason it must be disposed on that shaft -such that it will have the nozzles open or in operation during the period of time that the work holder being rotated is in proximity to the nozzles.

The adjustable cam 52 is adapted to operate a valve 55 supported on a column 55a xed to base l and is provided with a pivoted lever 5t that is acted upon by a spring il? for the purpose of closing the valve during such instances when the lobes of the

cam elements

53 and 54 are not in engagement with the roller 58 mounted on the arm 55. The valve 55 controls the flow of pressure uid from a suitable source of supply originating in a pump 5g, or some convenient compressed air reservoir in lieu or the Dump, and passes through pressure regulator R1 and is connected to the input side of the valve :55 by means of `a conduit 551. The exhaust side of the valve 55 vhas a flexible conduit Bib' connected thereto which branches out and extends to each of the needle operating cylinder connections on spray guns Iii, Il' and i8 disposed in appropriate po.si tions about the work piece 53. Flexible tube tia, from supply 59, by-passes valve 55, passes through pressure regulator R2, branches out and extends tothe atomizer connections on each oi `the spray guns I6, Il' and H3. The lower gun i8 is intended to spray the threaded portion 641 of the insulator or Work piece Se and the side spray gun Il is intended to apply conducting glaze to the tie wire groove surface indicated at 'o and the upper spray nozzle 'SI5 is intended to spray the line wire groove surface' with conducting glaze. An appropriate iiexible conduit -STI leads from the reservoirIi that lholds a supply of conducting glaze or from a pump which maintains a constant head and also agitates the glaze thus preventing settling subsequently described in greater detail. The said conduit 6l is led to each of the spray connections on housings t2; the conduits a and Gib lead to two different positions or locations on housings 62. The one to supply the air or pressure ii'uid for the 'atomizer connection for spraying purposes and the other to actuate the nozzle needle or plunger.

By referring to Fig. 6 wherein is set forth la detailed construction of the nozzle, it will be iobserved that the inlet t is adapted to be connected to the glaze supply. The inlet E9 is adapted to receive the atomizing air supply through pressure regulator R2 and conduits lila directly from source 5S, and inlet lil is adapted to receive pressure fluid supply from the conduit Gib through valve 55 thence from source 59 to operate the plunger 7l. rlhe plunger 'Il is xed to a rod 'I2 whose threaded end extends beyond the portion 'P3 of the nozzle housing d2 and has la nut 'I4 thereon adapted to provide for a plurality of adjustments in order to alter the quantity of material to be sprayed. The rod l2 extends entirely through the nozzle housing 62 and terminates in the needle element l5. It should be apparent that the needle element 'i5 functions as a valve and that plunger 'II in conjunction with the spring T6 will either open or close the valve, the plunger lI being opened by the pressure duid supply and the spring 'i6 closing it after the pressure fluid supply has been shut orf. Various adjustments are provided, as previously indicated, in the lnozzle to determine the quantity of material -to be sprayed and the velocity at which the conductingr glaze is applied -to the insulator Iand these adjustments must,oi cou-rse, be determined by the operator, depending upon the intended characteristics of the device to which the coating is being applied.

It will be observed that means must be provided to raise and lower the nozzle I8 in order that the work table I3 may be indexed because if such provision is not made, the nozzle I3 will not extend below the lower end of the tubular portion 326 and thereby prevent any indexing operation. This mechanism comprises a bar element 6 that is pivotally mounted on a support or column 'Il xed to the plate 3 by means of a flange 'I8 and cap screws '59. The nozzle I8 is arranged on a holding element d that may be either integral with or otherwise secured to the pivoted bar '16. The spray gun IB and the bar l are counterbalanced by means of a spring 8l that has its one end connected to the free end of the bar 'It and the other end of the spring is secured to a screw element 82 'xed in the plate li. The screw 82 is vertically adjustable in the plate 3 in order to vary the tension y'of the spring element. The table,` I3 has arranged on its lower side a flange or collar 83 that is concentric with the shaft Il and the axis of the table lli. Arranged inthe flange or collar y83 at appropriate positions are a plurality of notches lfl equal in number to the work hoide'rs I4 rotatably 'arranged in the table I3. Fixed to and rotatably mounted on the lever or bar 'F6 is a roller' adapted to engage or seat in the notches lid. The operation of theforegoing mechanism is such that as the table 'I3 is indexed the roller 85 which rests in one of the notches 84 will become disengaged therefrom and the said roller 85 will run along the lower edge of the llange 83 which action will pivot the bar or lever TB relative to the plate 3 on its support 'It and lower the nozzle I8 out of the path of motion of the lower portion of the work holder Ul thereby enabling the table I3 to be indexed.

The upper and lower nozzles in the particular illustrations are yshown as mounted on the plate 3 and one being mounted directly on the bar or support I 2. Clamp mechanism SS is associated with the upper nozzle housing 52 for holding the same on the vsupport I2 and the side nozzle housing 62 has a clamp 81 associated therewith which xes the nozzle I'I to a support 8B mounted on the plate 3 by means of the iianged end 89 and a nut 9i] that is threaded to an extension or projection of the support 88 yextending through the plate 3.

The overall operation of the device is such that upon initiation of rotation in the motorIQ and the shaft 24 carrying adjustable cam 52 and Geneva cam wheel 25 the latterwill cause the cooperating Geneva mechanism Ill to rotate the coupling 9 and shaft II and in turn the table I3. By reason of the Geneva mechanisms Ill and 25. the movement of table I3 will be periodical to index the table from one position to the next. it being understood that a work station is that work holder which is in immediate proximity to the Several spray guns I6, IT, and I8. The operators duties are confined to the simple operation of removing a finished or sprayed insulator from one of the work holders I4 and replacing it with an unfinished work piece and each succeeding work piece is therefore indexed `on the table I3 underneath and in proximity to the several nozzles 62. As each of the work holders I4 is brought adjacent the nozzles, its pulley 33 will engage the belt 41 and cause it to be rotated thereby. Simultaneously with this action the lower nozzle I8 will be lifted to the full-line position shown in Fig. 5 by reason of the roller 85 on the pivotal element coming to rest in the notch or depression 84 such that the spray therefrom will be directed into the threaded portion or pin-hole of the insulator 63. As soon as this action has been completed, the adjustable cam 52 will have rotated to a position such that it will open the valve 55 and admit pressure fluid to connections 'I0 of spray guns I6, and I8 which in this instance is preferably compressed air. The pressure fluid will axially move the needle element 'I5 of the gun thus opening the glaze valve in the nozzle. The continuously flowing air from connection 69 will atomize the glaze and spray it on to the respective surfaces Ell, 65, and 66. Since the cam 52 is being continuously rotated, it will in proper time open the valve 55 and in proper time the spring 51 will close the valve 55, subsequently the cam arm 3| of the wheel 25 will enter one of the slots 28 of the Geneva element I and start or initiate an indexing operation, it being understood that by this time the valve 55 Will have been closed and thereby permit only the minimum desired quantity of the conducting glaze to be applied to the selected areas of the work piece. Simultaneously with the initiating With the indexing operation, the lower nozzle |8 will be depressed to its lowermost position as indicated in Fig. by reason of roller 85 becoming disengaged from the notch 84. It will be understood that the several operations described are continuous and as previously indicated the operators sole duty is the removal of the finished work piece from the holders 33 and replacin-g an unfinished Work piece in each of the work holders.

A modication of the means of supplying glazing solution to the several spray guns I6, I'| and I8 is set forth in Figs. 14-1'7. This form of supply assures a virtually constant hydrostatic head as well as enabling a more uniform mixture by reason of the continuous circulation and the provision of a constantly actuated agitating means.

The device originates in a base element 9| on which a pair of

pedestals

92, 93 are mounted by means of

flange elements

94, 95 and screws 90 and 91. At the upper end of pedestal 92 a receptacle or vessel 95 is arranged, enclosed within a frame 91. Pedestal or column 93 supports a double

bracket constituting parts

98 and 99, each of which `is clamped to the pedestal 93 by a plurality of bolts |00 that ex-tend through apertures in each of the brackets.

Bracket 98 supports a motor |0| adjustably mounted thereon. A speed reducer |02 is secured to the motor I0| terminating in a pulley |03. Bracket 99 is provided with a longitudinally extended vertically disposed bearing |04. A shaft |05 is held against vertical movement in bearing |04 and at its upper end is provided with a pulley |06 connected to pulley |03 by a belt |01. On the other end of the shaft |05 that extends into vessel 96 is fixed a plurality of paddles or agitating elevessel 96. This system comprises a pump |09 fixed to the base of the machine, or it may be an independent element, whose intake line ||0 is directly connected to the vessel 96 in the manner shown and is provided with a gate or globe valve and a drain valve ||2. The exhaust line H3 of the pump |09 extends vertically a sucient distance such that there will be the required hydrostatic head on the several 4outlets I4, I5 and I I6 connectible to the nozzles l5, |'I and IB. The conduit ||3 is also provided with a drain valve and a globe valve I8. The upper end of conduit I|3 is goose-necked and drains into a conduit |25 loosely tting the same and then leads to the vessel 9S in the manner shown; the fluid returning to the vessel by gravitational action. Pump |09 is driven by a motor ||9. It is therefore evident that nozzles |6, I1 and I8 are provided with glazing compound under a constant head and that the glazing fluid is in a constant state of circulation and agi-tation. The valves I|2 and |l`| facilitate the flushing of the system in addition to acting as means to drain the pipe and conduit connected thereto.

The above description is thought to so fully reveal the gist of the invention that will enable others skilled in the art to which this apertains to construct and understand the same. That which is regarded new, novel and useful and which is sought to be protected by Letters Patent of the United States is as follows:

1. In a spray machine for insulators; a base; a work table on said base; means to index said table; a plurality of rotatable work holders on said table; means to successively rotate said work holders; a plurality of spray guns; cam means operable by said means to index said table to actuate said guns in a timed relation with the indexing of said table and rotation of one of said work holders; and means to movel one of said guns toward and away yfrom a selected work holder.

2. In a spraying machine; a base; a work table supported on said base; a plurality of work holders on said table; a plate supported on said base; means on said plate to successively rotate said work holders; means to index said table; a plurality of spray guns on said machine arranged to spray specific areas of an insulator; a control Valve operatively connected to each of said spray guns; means .to admit spray material to each of said spray guns under a substantially constant hydrostatic head; cam means operated in a timed relation to said indexing means to govern said control valve; and means on said plate cooperating with means on said table to vertically move one of said spray guns to permit indexing of said table and to bring the spray guns into the proper working position.

3. A conducting glaze spraying machine; a base; a work table supported on said base; a power source; a speed reducer and gear box on said base operatively associated with said power source; a driven shaft extending vertically from said gear box; a column xed to said base and extending upwardly parallel to said shaft; a shaft rotatably supported on said column; a Geneva wheel indexing mechanism connecting said shafts to index said shaft on said column; a Work. table sulfportedl on saidl shaft on said column; a plurality ci work rholders rotatably supported on said table; means mounted on said base vertically spaced from said table supporting means to successively rotate said holders; an adjustable cam on said shaft extending vertically fromsaid gearv box; a control valve controlled by said adjustable cam; means to move one of said guns vertically with respect to other of said guns in timed re'- lation With said indexing mechanism; aplurality of spray guns supported adjacent said table; and means connecting said valve spray guns and said table indexing movement and said ctmtrolI valve actuation operating in timed relationship to spray a work piece heldin said Work holders` as they are successively presented to saidspray guns.

2l. In a spray machine for insulators; a base; a Work table supported above said base; a plurality of work lholders on said base; means on said base supporting means to successively rotate said Work holders; a transmission and power source on saidbase; a driving shaft connected to 1f:

said transmission; a'driven shaft connectedI to said table; means to periodically rotate saiddriven shaft fromA said driving shaftA which includes a` Wheel having a peripheral ange and including a cam arm formed on said Wheel; said iiange extending only partially about the Wheel; a slotted cam Wheel Aiixedto said driven shaft said cam arm engageable with the slots in saidx slotted Wheel to index said table from said driving shaft; and aplurality of pins'on said slotted Wheel; said pins and wheel interlocking when said driven shaitis 'at rest to. hold it in a stable condition; oneoi said Work holders being rotated when said driven shaft is locked against movement.

5. In a Spraying machine; a base; awo'rl; table rotatably supported'on said base; a pluralityof` rotatable Work holders on said table; a, 'supportl on said base mounting means to `succe'ssively rotate said Work holders; a motor on said means; a speed reducer and a gear box on said base cionnected together anddriven by said motor; adriving shaft connected to said Igear box; v'adrivon shaft connected to said table; a anged Wheel having a cam armband a slottedcam Wheeljoperatively associated and connecting said'shafts to index said table from said driving shaft, said slotted wheel having means thereon engageable with said flanged Wheel to lock said table against movement when 'one 'of said Work holders is 'being rota-ted; a plurality of spray'guns xed on said machine; -a valve to control said spray guns; and an adjustable cam mounted on `said driving shaft to controlsaid valve; said'valve being held open by said adjustable cam When onexof said Work holders is being rotated.

(i. In a machine adapted to spray speciiic areas ci an insulator; a base; a Work table supported on said base; a plurality `of Work holders rotatably mounted on said table; meanstoindex sai-duk table including a driving and a driven shaft; a plurality of spray guns li-lxed to said` machine one directed at each specic area; Va valve to control said nozzles; an vadjustable cam on said driving shaft to govern said valve; a valve governed in a timed-relation 'to the indexing of said table and rotation of *one of said Work holders; means to vertically move one of vsaid nozzles Ain atimed relation with theindexing 'offsa'id 4'table comprising a notched me'anss'ecured `-15o-said'tablegand liU a pivotedlever engageable with the notches in said means to vertically move said nozzle in timed relation with said table and the governing of said valve.

7. In a spray gun moving mechanism ior a spray machine; a base supporting a table having a plurality of Work holders thereon; a supporting element on said base and disposed beneath said table; a collar integral with said table and having a plurality of notches therein; a support on said element; a bar pivoted to said support having a spray gun xed thereto; the nozzle of said spray gtui when in operating positionv extending into one of said Work holders; aroller on said bar engageable in said notches; saidcollar depressing said lever when said tab-le is indexed to move said nozzle out of the way otsaidlwo'rk-holder, and said roller when entering the succeeding 'notch allowing said pivoted bar to tilt and said nozzle carried thereon to enter the succeeding Work ,holden 8. In a spraygun moving mechanism; a base; a Work table includ-ing a plurality of rotatable WorkY holders mounted on said base; means to index said table; a support mounted on said base; means on said support adapted to successively rotate said holders; a pivoted bar on said support; a spray gun on said bar adapted to be moved thereby into and out of said Work holder undergoing rotation; 'a notched collar concentrically disposed on said table; and a roller on said bar engageable in one ofv said notches in said bar; said spray gun being in an elevated position when said-rollerisseatedl in said notch and `in a depressed positionvvhen said roller is disengaged froin one of said notches.

9; Inv a spray lmachine adapted to coat selected areas of an insulator; a base; an indexable table supported thereon; means vto index said table;

a plurality of rotatable Work holders in saidtable to govern the admission of jpressure fluid to said-spray guns in a timed relation with the indexihg-otsaid table; and means to vertically move one-of said spray guns in a timed relation tothe indexing ofi-said table, land to the rotation offone of said Work holders.

l0. In a spray machine; 'a base; a shaft rotatably mounted on said base; a table xed to saidA shaft; -a plurality of Work holders rotatably mountedy onl said table; means fixed to said base vertically displaced from' said table supporting a transmission Imeans to successively ro'- tat'e one of said-Work-holders; a plurality ofr spray guns on said machine; means to supply pressure iiuid Vand conducting glaze to said guns under substantially constant pressure, including a standpipe in Which-the llevel of said conducting glaze -ishigher-lthan said spray guns; means to index said table; 'avalve to govern the admission of pressure iiidto-said'spray guns; and means associatedl with-said means toindex saidl table to op-erateV saidvalve in a timed relation tothe indexing of said table and vrotati'onoi one or" said Work holders.

ll. In a device for a spraymachine .to deliver glazing fluid to sprayiguns at a constant hydrostatic head; 'a yreceiving vessel;l an agitating means in said vessel; a pump adapted to draw glazingriuid fromsaidvessel; a stand pipe assocated'with said pump adapted to receivethe exhaust offfsaid pump; aplurality of spraygun outlets on said standpipe; said standpipe extending above the spray gun outlets and the guns connected therewith to gravitationally apply pressure to said outlets; and means connecting the upper end of said stand pipe with said vessel; said pump. and said agitating means keeping the glazing fluid in a state of circulation and agitation.

12. In a machine for coating the surface of a work piece; a base; a work table movably supported on said base; means to impose an indexing movement on said table; a plurality of rotatable work piece holders supported on said table; means to selectively rotate one of said work holders; a plurality of spray guns supported on said base; means to supply coating material to said spray guns which includes a standpipe extending above the level of said spray guns and in which the level of the material is maintained above said spray guns; and means operable by said means to impose an indexing movement on said table to control the actuation of said spray guns in a timed relationship with the indexing movement of said table.

13. In a coating machine; a base; a work table; means to rotatably support said table on said base; a plurality of Work holders rotatably mounted on said table; means to index said table on said means; means supported on said base to successively rotate said work holders; a plurality of spray guns adapted to spray a work piece held in said work holders; means operatively connected with said indexing means, including a valve and valve operating device, to control the actuation of said spray guns in a timed relation with said means to index said table; and means on said table to move one of said spray guns relative to other of said spray guns during the indexing of said table.

14. In a spray coating mechanism; a base; a work table rotatably supported on said base; driving means to index said work table; a xed table supported on said base; a plurality of work holders on said table; means on said fixed table to successively rotate said work holders; a plurality of spray guns on said mechanism adapted to spray-coat specified areas of a work piece; a control valve conduit connected to each of said spray guns; pump and stand pipe means to admit spray material to each of said spray guns under a constant hydrostatic head; cam means operable by said driving means and in a timed relation to said indexing to govern said control valve; and means to move some of said spray guns relative to each other to enable said table to index and bring said spray guns into proper working position.

15. In a spray machine; a base; a shaft rotatably mounted on said base; a table fixed to said shaft; a plurality of work holders on said table; means fixed to said base supporting a transmission means to successively rotate said work holders; a plurality of spray guns on said machine; means to supply conducting glaze to said guns under a substantially constant pressure; means to index said table; means to vertically move one of said spray guns out of the path of movement of said work holders during indexing of said table; a source of pressure fluid; a valve to govern the admission of pressure fluid to said spray guns; and means to operate said valve in a timed relation to the indexing of said table and rotation of one of said work holders.

16. In a spraying machine; a base; a shaft rotatably supported on said base; a table secured on said shaft; a plurality of rotatable Work holders on said table; means associated with said base mounting means to` successively rotate said work holders; a plurality of spray guns on said machine; means to supply pressure fluid and conducting glaze to said nozzles under a substantially constant pressure which includes a standpipe extending above the level of said spray guns; means to index said table; means to move one of said spray guns out of the path of movement ofsald Work holders; a valve to govern the admission of pressure fluid to said spray guns; and cam means to operate said valve comprisinga pair of relatively adjustable plates having cam lobes thereon, said lobes being adjustable to vary the opening and closing time of said valve, said cam means associated with said means to index said table and operable in a timed relation to the indexing of said table and rotation of said work holders.

17. In a spraying machine; a base; a Work table rotatably supported on said base; means to index said table; a plurality of rotatable work holders on said table; means to successively rotate said work holders; a plurality of spray guns whose nozzles are directed toward a given work piece; a valve to control said guns; cam means associated with said means to index said table to operate said valve; and means on said table to vertically move one of said guns during the indexing movement of said table.

18. In a device as defined in claim 17 in which said means to index said table includes a power transmission terminating in a shaft; a shaft fixed to said table; and a Geneva indexing means including means to lock one element thereof against rotation when said table is at rest.

19. In a spray machine, a base; a table supported on said base; a first shaft to which said table is secured; means to index said table which includes a power producing and transmitting elements, the terminal element of which is a second shaft parallel to said rst shaft; a wheel having a cam arm associated therewith fixed to said second shaft, said wheel having a flange extending partially around the periphery thereof, a slotted wheel fixed to said first shaft, said slots cooperating with said cam arm to index said table; a plurality of spray guns supported on said base; a control valve for said guns; cam means on said rst shaft to open and close said valve; said cam means opening said valve when table is at rest and closing said valve when said table is in indexing movement; means on said slotted wheel engaging said flange to lock said table against movement between each indexing of said table; and means on said base to rotate the work holder adjacent said guns between indexing movements.

20. In a device as defined in claim 19, having means on said table to vertically move one of said gun-s during the indexing movement of said table.

21. In a spray machine; a base; a column on said base; a shaft supported on said columns, a table fixed to said shaft; power transmission means on said base terminating in a driven shaft in operative relation to said column shaft; means connecting said shafts to index said column shaft from said driven shaft, including means to lock said column shaft against motion when no indexing movement is applied thereto; a plurality of work holders on said table; means mounted on said base to rotate each of said Work holders in succession; a plurality of spray guns supported on said base whose nozzles are directed toward a selected work holder; a valve to control said nozzles; means. on said drivenL shaft to open said valve when said-'holder is rotated, and' close same WhensaidtabIe is indexing; and.` cam means on` ing shaftxand columnv mounted on said; base; av Geneva cam Wheel mounted on said shaft, said'. oamarm indexing -saidshaftwhen said cam arm. isrotated; a table mounted? onsaid shaft having; a. p1ur.alityA of rotatable Workholders thereona supporti mounted,v on said'l base and; verticallyl spaced. from said table; driving' means on saidV support to successively rotate said wor-k'y holders as they are presented to said driving means; a plurality of spray guns carried. on said machine;

an adjustable cam rotated'in timed relationto.

said cam arm; azva'lve eontroll'edfiby. saidzadjusti-v able cam, said Valve controlling said sprayguns; andl said valve operating camV and: the Geneva indexing mechanism operatingin a definite. timed relationship.

WILLIAM Pn. SMITH;