US2246502A - Automatic spraying machine - Google Patents

Description

June 2 4 1941 s. BRAMsEN ETAL 2,245,502

' AUTOMATIC SPRAYING MACHINE Filed Nov. 8. 1937 -4 sheets-snaai 1 y @JMW @y June 24', 1941. s. BRAMSEN ETAL AUTOMATIC SPRAYING MACHINE Filed Nov. ya, 1937 4 Sheets-Sheet 2 Umml. wmf@ nm/ www w@ 5mm ITI June 24, 1941K.

s. BRAMSEN ErAL AUTOMATIC SPRAYING MACHINE Filed Nov. s, 1937 4 Sheets-Sheet 5 June 24, 194i.

S. BRAMsEN ETAL AUTOMATIC SPRAYING MACHINE Filed Nov. 8. 1937 4 Sheets-Sheet 4 -llll f5@ Patented `.lune 24, `194,1

iihi'rso AUTOlVIATIC SPRAYING MACmE l Svend Bramsen, ric Gustafsson, and Fred- W.

Wahlin, Chicago, Ill., assignors to Binks Manufacturing Company, Chicago, Ill., a corporation of Delaware Application November ii, i937, Serial No. 173,366

9 Claims. (im. 91-45) The present invention relates to spraying devices and more particularly to machines for automatically spraying such articles as have fiat or substantially fiat surfaces so as to coat the same with sprayed material, such as vitreous enamel, ceramic material, synthetic enamel, lacquer, paint, asphaltic compounds for sound deadeny ing, etc.

Among the objects of the invention is to provide a novel `spraying device for automatically coating the surface of anarticle being moved in a given path, as on a travelling conveyor, by giving the spraying means movements across the line of travel of the article in given time relation thereto so that the coating will be uniform over the whole extent of the sprayed surface, and automatically controlling the time of s spraying in accordance with the width of the surface being sprayed,` as Well as discontinuing the spraying, when the movement of the article ceases, to prevent spoiling the coating.

More specifically, the invention comprehends Aa reciprocating carriage so mounted' as to be recipro'cated straight across or more or less diagonally across the path oi movement of the article at given speed, the carriage carrying one or more `spray guns, preferably of the type which produces :dat sprays, and means for regulating the dura- "tion or the spraying during the reciprocation of the carriage in accordance with the width of the surface of the article being coated. Such means is preferably of the adjustable type and is so located that'as the spraying gun or. gunspass i'rom over the surface being sprayed the spraying action will stop regardless of the length of. the stroke of the carriage, or in other words, the spraying is effective only during the time the gun or guns are over the surface of the article being coated. One of the advantages in this is a great economy in the spraying material used, which is highly important in the case of using expensive material, besides preventing a scattering of wasted material in andm about the device where it would clutter the mechanism, reduce its efilcient operation, increase its wear and This spray operation controlling means is carried by the reciprocating carriage, and although it hasthe same ilxed stroke of the carriage, it s0 operates the spraying means that the duration of the spraying will be for a portion of that stroke of the carriage and the parts carried by the carriage. The part of the stroke during which spraying occurs may be termed the spraying stroke.

The .spray operation controlling means is in the natureof a rocker arm or lever, pivotally mounted on the carriage with an` end thereof so disposed as to have a path of movement in the space between the cams so that as such end of the lever moves toward either c'am,- it will engage the one or the other of the cams whereby the lever will be rocked to shut oli' the spray guns. The other end of the lever is connected to means for operating the spray gun triggers, so that as the'lever is rocked, as by a spring, to one position, that is, to the position in which it travelsfreely between the cams, it operates the triggers to open the spray guns whereby a spray is eiecte'd during the time and for the distance the rocker arm is travelling between the cams, which is for a part of the stroke of the carriage, and as the lever is rocked to another position, that is, when `it engages a cam so as to be rocked thereby, it

so operates the triggers as to shut ofi the guns and stop the spraying.

The invention comprehends a novel means for f operating the guns, such means kcomprising a trigger lifter so disposed as to raise or swingthe `triggers of the guns, in unison when there are more than one gun in use, to cause the guns to i spray, and to effect a lowering of the triggers,

- also in unison when more than one gun is used,

to shut oi the guns and stop the spraying;v This lifter is connectedv 'to the rocker arm and is operated in one direction, lifting direction,by a V spring, and in the other direction, lowering direction, to cause shutting off of the guns, by

, the cams4 as the rocker arm Aengages them when decrease its life, require frequent cleaning and y increased labor and maintenance costs, etc.

The governing or control means'for the dura! `tion of the spray, in the illustrative embodiment, `comprises a. pair of cams which are adjustable to and from each other depending upon the length. of spray stroke desiredand are so located i `as to bein the path of reciprocation oi a means moving in adirectiontoward the ends oi the strokes of the carriage.

As another feature of the invention, the latter l comprehends a -novel carriage having means for reciprocatingly moving along a track orl tracks vertical track or tracks along' which vertically reciprocates a slide body, such as a block, with vrollers rolling along such vertical track or tracks,

the block having a connection, such vas a pin,

with'an endless chain operating over sprocket Wheels which are so disposed that the laps of the chain between them travel horizontally and transversely of the path of travel of the article being sprayed, and the chain portions passing around the sprocket wheels will give the pin and the connected vertically movable slide body a vertical component movement at the ends of the strokes of the carriage. The horizontal laps of the chain between the points of contact between such laps and the sprocket wheels travel at constant speed so that the carriage has a constant speed of reciprocating movement through out the effective length of its strokes, the effective length of the stroke being taken as that length of the horizontal laps of the chain between their tangential points of contact with the sprocket Wheels, the remaining component horizontal movements beyond such effective stroke lengths, arising by reason of the chain link carrying the pin around half of each sprocket wheel, not being regarded as part of the effect length of the strokes.

The invention also comprehends as a feature thereof, the provision of a novel support for the spraying means, the means for operating the spraying means, and the means for supplying the material and spray producing fluid to the spraying means. In the illustrative embodiment this feature comprises a vertically disposed frame structure carried by the carriage and having laterally extending and vertically spaced brackets to which are adjustably clamped vertical tubes in which the ducts or pipes to the guns for conveying material to be sprayed and compressed air are located, and to the lower of which brackets are connected material and air manifolds and the guns themselves, the brackets also having suitable apertures for the passage of a vertical rod connected to a trigger lifter and to the rocker arm, the rocker arm being pivotally mounted on the upper of such brackets.

Another object of the invention is the -provision of means for stopping the spraying when the travel of the article being sprayed stops traveling. In the embodiment chosen to illustrate the invention, such a means comprises a penumatically operated piston and piston rod which coacts with the previously mentioned spray controlling rocker arm or lever to so move it as to shut off the spray guns when the circuit 'to the conveyor motor is opened. While the switch in this circuit is conventionally shown it is to be understood it may have an overload circuit breaker adapted to open the circuit should the conveyor become stuck or an overload be so imposed on it as to slow up its travel or to stop it entirely. The piston and its rod, normally held in'inactive position by a spring, are operated pneumatically, that is, by compressed air as maybe admitted by a valve connected to an electro-magnet in a circuit in shunt with the circuit to the conveyor motor, whereby as the circuits are opened the solenoid of the electromagnet is deenergized and the air valve is so operated as to admit compressed air to the piston device and thus operate the rocker arm or lever to shut off the spray guns. Accordingly, the

spraying may stop at substantially the same inreturned to its inactive position by the spring when the cam engaging end of the rocker arm is in its path of travel between the cams, at which I time the spraying action is started.

The invention preferably also comprehends the provision 'of means for shutting off the spraying only at an end of the spraying stroke when the circuit to the conveyor motor is opened, the movement of the conveyor and of the carriage continuing after the conveyor motor circuit is opened to the point where the reciprocating carriage has reached the end of the spraying stroke, that is, both the conveyor and the reciprocating carriage come to a stop after the spraying across the surface of the article has been completed, thus avoiding the stopping of the spraying at some intermediate point of the spraying stroke. This is effected by providing a shunt circuit connected to the carriage reciprocating motor and to the conveyor motor circuits with means connected to and actuated by the rocker arm for opening such shunt circuit at the time when the control cam, with which the rocker arm. engages, rocks the rocker arm. The motor circuits have relay controlled circuit breakers for opening the circuits when the relay means is deenergized or partly deenergized by the opening of the shunt circuit by the rocker arm.

The invention may also comprehend novel means for so disposing the device as to reciprocate the carriage not only straight across the path of travel of the article being sprayed but also transversely at any desired or given angle to such path. In such case the device may be mounted as to turn about an axis perpendicular to the plane of the conveyor, as on a turntable which may be angularly adjusted to the desired angle between the line of reciprocation of the carriage and the line of movement of the article.

Other objects, capabilities, advantages, fea-,

tures and the like are comprehended by the invention as will later appear and as are inherently possessed by the invention.

Referring to the drawings:

Fig. 1 is a top plan view conventionally showing a lay-out of the invention;

air from the piston device, the rocker arm being Fig. 2 is a side elevational view of the same;

Fig. 3 is an end view in elevation of the same;

Fig. 4 is a front elevational view of the sprayers and the supporting and operating mechanism therefor;

Fig. 5 is a top plan view, with parts broken away, of the same;

Fig. 6 is a sectional view taken in a vertical plane represented by line 5--6 in Fig. 4 of the drawings;

Fig. 7 is a fragmentary horizontal sectional view taken in a plane represented by line l-l in Fig. 6 of -the drawings;

Fig. 8 is a fragmentary sectional view taken in a vertical plane represented by line --S in Fig. 6 of the drawings;

Fig. 9 is a transverse sectional view taken in a plane represented by line 9-9 in Fig. 8 of the drawings;

Fig. 10 is a vertical sectional view of an electro pneumatic control means for stopping the spraying when stopping the operation of the machine;

Fig. l1 is a diagrammatic view of the same together with an electric wiring diagram of the motor circuits;

Fig. 12 is a top plan view of an alternative form of machine whereby the strokes or reciprocationsl of the spraying means may be at an angle to the direction of movement of the articles sprayed;

clamping nuts.

Fig. 13 is a fragmentary part sectional and part elevational view taken in a plane represented by line II- in 12 of the drawings;

Fig. 14 is a fragmentary elevational view and a wiring diagram of an alternative form of means, for stopping the sprayingand machine at the end of theistroke of spraying; and, l

Fig. l is a top plan View showing the diler-v ence of spraying straight across and diagonally or angularly across a narrow object.

Referringl morein -detail to the drawings, the embodiments selected to illustrat'e'-V the invention are shown as comprising an endless rope con'- veyor i passing over pulleys 2 and 8 (Figs. land 2) Vsuitably," rotatably supported in stands 4 and ii, and. driven by a motor operatingthrough a reducing drive i and pulley 8.

I2 carried by roller supports tt and M 'cach inf The conveyor passes through chambers. t, It

and il in which spraying of conveyed articles i1 mayoocur. the spray device lmishown in'- general in lilas. l, 2 and 3, operating in chamber vi--i for automatically spraying theftop ilatorsuhstantially hatsurface ot .the article l2 as it is conveyed through the chamber IL.:v

When spraying dat articleswithout side walls,

`the spraying is effected in .the chamber only.-

When articles to be sprayed have also side walls, such as'tlangeg I4, these ilangeaare sprayed by workmen stationed at thechanibers l and Il by spraying through 4the windows' fl l Il. as the article passes through the chambers I and III..

and the top surface oi' the article is automatically sprayed in the chamber Il as the articlepasses therethrough, the, workxnen standing at oppo site .sides ot the machine' at locations :or loci I1 ,and Il at the sides oi chambers 2 and Il respectively. i

The conveyor may, if desired or found necessary, have upwardly extending pins Il for supporting the articlelout ofcontact with the'oonveyor. When using a rope time of conveyor, the use of pins may be inconvenient and in that case the article will be supported directly upon the ropes. 'I'he tautness of conveyor may be ad- .iusted by suitable adjusting screws 2l on th stand 4 (Figs. 1 and 2). i; i

The automatic spraylns device in the champressing on a support Il carried by the 'cross ber I I is shown more lx1-'detail in Figs. 4. 5, 6, 7,

8. 9 and 10, and comprises spaced supporting standards or posts 2| and 22 of tubular or hol--4 low cylindrical form and at their lower ends to pedestals 28 and 24 seating on and/orl fastened to the door of the chamber I l et the sides therebeam 2l which extends transversely oi thechamber Il and at an adjustable elevation. "I'he web part 23a of the beam Il'ls clamped or bolted-to box-like brackets Il and 21 which have curved recesses for receiving'sidwlwrtlonsot the posts 2| .and 22. (see 2)"and which are held clamped to tbepostr by Ufbolts 2l and 2l. these bolts passing around the posts andthroughthe brackets 2l and 21 and the web, IIa-o! thebeam 25 where their .Secured to these a channel iron cross ad e .threes w www.

Beneatntne brackets" :s and u 'are adjusting/ff pom :rana 'n' by'usbalu'niand u vilains around the posts '2| and 22 and through the adiustlng brackets "and Il to suitable clamping nuts. 'Ihcsebracke'ts ltlandli carry-'adjusting screws I4 and Il the en ds ot which contact the lower sides o! the brackets 2l and 21. I

For adjusting. the u-bolu n u, u dat u.

brackets and 2i which are clamped to the the triggers O0 and 1l swing tracks as and s1 suitably secures to the sangen.

as by screws or bolts. These tracks are oc tagonal in cross-section and upon the inclined faces thereof reciprocatingly roll rollers 33 Vand the funn oi an elongatedbar (see Fig. 5l 'lhasa bars 4land 4I are bolted to upper and lower cross heads 42 and it oi a vertically disposed elongated rectangular carriage trame t4. Buitable adjusting screws t and dit are carried by the cross heads 42 and it and coast with the roller carriers 4l and `iii for adjusting the rollers 3l and to the tracks tt and 31 for smooth reciprocation of. the carriage along the tracks.

Integral for rigid with the cross heads 42 and 4I are Alaterally extending brackets 41 Aand-4I to which are clamped vertical tubes 42 and Il by clamping cleats Il and 52 seciiicdby suitable clamping bolts. To the tubes '42 and i0 are secured, as by suitable bolts or strews.- guide heads I2 and I4 which are suitably apertured for the vertical reciprocation 'therein of a vertical trigger operating rod li. the upper end 'of the rod Il being pivotally connected to a rocker arm It suitablyv secured to a shaft l1 having suitable bearings in a bracket Il secured to the top of the upper. erosshead bracket 41. 4

The upper end of the rod Bl carries a head Il against which pressesA the upper end of 'a helical spring which surrounds the rod it, as shown in Figs. 4 and 6, the lowerend of the spring head l2. The brackets 41 and\4l have large openings l2 and Il for the tree passage o! the rod Il and spring Il. yThe lower end of the rod is secured to a tube t4 which reclprocatcs in the erolshead I4 (see F18. 6). and this tube it threaded to an upwardly extending arm Il cf'a trigger lifter crosshead Il. This head carries fixed angle brackets I1 and Il for lifting triggers Il and 1I oi the spray guns. In the device illustratod there are four guns (only three boing shown) and the end guns have triggers t! an the intermediate guns have triggers 1|, r

The bracket Il carries an adjusting serew1l to act as an abutment for the movement of the rocker arm Il. On the bracket Il is also fixed a cylinder 12 in which a piston 12 is normally pressedl upwardly Vby a spring 14. the piston carrying a piston rod 1I the 'loyer end of which isoppositeand normally s .lirom a' button Il carried by the rocker arm d. At the upper .end the cylinder -12 basan slginlct-outlet 11 connected to a compressed sir hose 1l.

When compressed'an. is admitted byw'ay of the hose n into thecylinder 12, the piston 12 and the rod 'Il are depressed and the rocker arm Il so rocked as tomove the trigger operating rod downward and hence the trigger brackets I1 and Il so that close oi! the guns. 4

At the other end of the rocker arm Il is securcdfss by a'set screw. a bearing screw "for rotstsblycarrying a cam roller which is adsptdownwardly 'and ed to ride up upon-the cams 8|. There are two of these cams, one at each end of the cross beam 25 so that as the reciprocating carriage arrives at the ends of its stroke the cams will be so located as to cam up the roller 80 and the rocker arm 56 so as to depress the trigger operating rod 55 and hence the lifter brackets bland 68 to permit the triggers 69 and 10 to shut oi the guns and stop the spraying.

The cams 8| are adjustably supported and are fastened to cam bases 82 adapted to slide longitudinally on cam tracks 83 fixed to a base plate 84, by suitable screws (see Fig. 9), the screws serving to secure the assembly rigidly to the top of the cross beam 25. Each cam 8| is secured to its base 82 by suitable screws or the like, and has recesses for receiving upwardly extending lugs 85 and 86 of a nut 81 and a block 88 which are shaped to slide in the channel between the tracks 83 (see Figs. 8 and 9). The nut 81 is threaded to an adjusting screw 89 which has right and left hand threads at the end portionsv thereof for causing the nuts 81 and the cams 9| to mutually approach or separate when rotating the adjusting screw in one or another direction. The bore of the block 88 is unthreaded so that the block may slide without binding with the screw-89, the lug 86 serving to maintain the cam 8| alined and to prevent its turning about the axis of the nut lug 85. The ends of. the screw 89 are reduced in diameter to provide shoulders abutting end thrust blocks 90 which also serve as bearings for the ends of the adjusting screw 89. At one end the screw 89 has an extension to which is secured a hand wheel 9| (see Figs. 4 and 5) having a handle 92 by which the adjusting screw may be manually rotated and the cams adjusted to and from each other depending upon the direction of rotation of the screw 89.

The means for reciprocating the carriage is mounted on the cross beam 25. It comprises a motor 93 (see Figs. 4 and 5) suitably secured to the web plate 25a of the cross beam 25 and having a shaft 94 to which is secured a sprocket wheel 95 over which rides a driving chain 96 runningover a sprocket wheel 91 fixed to a shaft 98 operatively connected to a speed reducing device 99 suitably fixed to the web wall 25a of the cross beam.

From the speed reducing device extends a shaft (see Fig. 4) which passes through the web wall 25a and is rotatably supported in a bearing |0| vfixed to the inside of the web wall 25a. To this shaft is secured a sprocket wheel |02 over which rides a chain |03 running to a sprocket wheel |04 fast to a shaft |05 rotatably supported in a bearing means |06 -adjustably connected to the web wall 25a. (See Figs. 4 and 6.) To this bearing means is connected a chain tightener |01 secured to the web wall 25a and having an adjusting screw for adjusting the bearing means longitudinally of the cross beam 95 for tightening the chain when it becomes slack, a suitable slot being provided in the web wall 25a through which a part of the bearing means extends to the chain tightener |01.

The carriage frame i9 has spaced upright side posts 94a (see Figs. 6 and 7) to which are se cured vertical channel tracks |89. In these tracks vertically reciprocates a `slide body or block 09 having pivotally mounted rollers ||0 at its corners and which travel vertically in the channels of the vertical tracks |98.. See Figs. fl. 6 and 7. The center of the block carries a pin iii one end of which is fast with a short channel piece or clip ||2 (Fig. 6) spanning and being fixed to a link of the chain |03. As the pin travels with the chain link the block |09 is caused to reciprocate vertically in the carriage frame tracksy 44a while at the same time the carriage frame is given a horizontal reciprocation along the carriage tracks 36 and 31. The horizontal stroke of the carriage is equal to the distance between the axes of the sprocket wheels and. the pitch diameter thereof. The vertical reciprocation of the block |09 is equal to the pitch circle diameter of either sprocket wheel |'02 or |04, they being of the sameslze.

To prevent the block |02 from descending too low by reason of its weight and as may be permitted by reason of any slack in the lower lap of the chain |03, a lower limit stop ||3 is xed to the lower end of the carriage frame 44, as by a screw ||4 (Fig. 6) and has a stop nnger ||5 so located that the lower end of the block |09 will abut it and be limited by it in the downward movement of the slide body or block.

The spray guns |20 and |2| are supported by Way of air and material manifold mounting brackets. As shown in Fig. 4, a bracket ||6 is .secured to the cross head 54 and carries an air manifold |I1 connected to a pipe H8 which is connected to the lower end of a hose ||9 extending down in the tube 50, the upper end of the liose extending upwardly out of the upper end of the tube 50 to a compressed air source (not shown). The manifold ||1 has connections ||1a to the upper parts of the spray guns |20 and |2|, there being in the illustrative embodiment four guns in a row at right angles to the line of reciprocation of the carriage, the end guns being designated |20 and the inner guns being designated |2|,

From a suitable material source (not shown) runs a material duct or hose |22 which enters the upper end of the vertical tube 49 and extends downward for connection at its lower end to the upper end of a material pipe |23 leading to a manifold |24 having connections |25 to the lower portions of the guns (Fig. 6). The vertlcal tubes 49 and 50 together with the cross heads 53 and 54 and the other parts carried thereby and by the tubes 49 and 50 are vertically adjustable in the -clamps v5| and 52. The spray guns used may be of the kind disclosed in the patent of Bramsen 8; Wahlin, No. 2,107,726, granted February 8, 1938.

In use the device is operated by motors 6 and 93, the motor 6 driving the conveyor and the motor 93 reciprocating the carriage. The spraying occurs during that part of the stroke of the carriage which corresponds to the length of the space between the cams 8| where the rocker arm roller normally travels until it engages either cam to rock the rocker arm 56 and to depress the trigger lifter 66 and thus close ofi the spray guns.

Should the ware or article being coated by theV in which a shunt circuit lac and its is connected to the circuits 26 and |21, and the main circuit |39, and to contacts |41 and |48 respectively carried by an arm |49 fixed to the rocker lever 56 and to a fixed part `|5|| of the device. If the switches. are opened during the spraying stroke, the contacts |41 and |48 are' in closed circuit condition at that time, since the cam roller 88 is moving between the cams 8|,and the current continues by way of the shunt circuit |l||`|461 to the motors 6 and 93. As the carriage apsolenoid by way of a link |31. At the other end oi the chamber |34 are connected air chambers |38 and |39 in which are located spring pressed valves |49and |4| for controlling communications between the chambers |34 and the chambers |38 and |39. The valves |49 and |4| have stems |42 and |43 extending toward the lever |35 and adapted to be engaged by thelever |35 when operated by the solenoid |32. A compressed air inlet |44 is connected to the chamber |89 and an air exhaust outlet |45 is connected tothe chamber |36. From chamber |34 leads the air duct or hose 1l which is connected to the top oi the cylinder 12 (Figs. 4 and 6).

Ii' at anytime the conveyor motor circuit should be opened and the conveyor stopped, as by opening the switch in the circuit to the motor t, and if no'provision were made for also stopping the spraying as the carriage continues to reciprocate, an excessive amount of spray materiai would be sprayed on the surface of the `article and the coating ruined. In the present invention, this is avoided by opening the shunt circuit |3I, which 'effects a deenergizing of the solenoid and a lowering of the lever '|35 whereby the valve |4| is opened and the valve |49 is closed. Compressed air flows by wayv of duct.

|44, chamber |39, valve |4|, chamber |34. hose 'i8 to cylinder "whereby the piston 13 is forced downwardly with the piston rod to press down the rocker ann part connected to the trigger liiterrod 55 and to depress it and the lifters 61 and 68 'and hence permit the triggers 69 and 19 to close ofi' the spray guns. Thusthe spray guns are prevented from further spraying the` material even though the carriage continues to reciprocate by reason of the motor continuing to operate. However,` if desired the two switches |28 and |29 may be so related as to operate to v tether when opening or closing the circuits. In

such case the air' pressure acts to stop the spraying when the conveyor and the carriage are stopped so that the spraying will not continue at one point on the article and'thus spoil the coating.

"trigger operating rod 55 and hence the triggers t9 and 19 to again open the guns for spraying, provided the cam roller 89 isoi! of the cam 9|, and in which case the rocker arm 56 is rocked to iower the cam roller 89.` I

In some'cases it might be desirable when stopping the'rnachine that the spray benot stopped within its stroke o1 spraying but be continued to nnish its spraying stroke and then stop. That may be eilected by the means shown in Fig. y14,

preaches the end of its stroke, the roller 8|)` contacts a cam 8| and hence the rocker arm 56 is rocked to the position shown in Fig. 14, whereby the circuit .|46--I461 is opened by reason of the separation of the contacts |41 and |48, and hence both the conveyor and the carriage stop at the end 0f the spraying stroke, the spraying also stopping by reason of the downward movement of the trigger rod 55.

The circuits |26 and |21, between the switches |28'and |29 and the motors 6 and 93, are pro- 'vided with relay controlled cutout switches or circuit breakers |63 and |64 carried on a shaft or rod |65 extending through solenoids |69 and 19. One end oi the shaft' |65 is connected to a spring |61 and the shaft carries armatures |66 and |68 which are operative in the solenoids |69 and |19.y These solenoids areconnected by way of shunt circuits |1| and |12 to the circuit portioni46l, these circuits 1| and |12 being connected to-the returns of |46l respectively to the circuits |26 and |21.

Assuming the switch |28 to be opened, (switch lili! being closed) and the carriage at a point where the contacts |41 and |48 are closed, the motor 6 will continue to run to operate the conveyor until the carriage has moved to where the rocker arm is operated by the cam 8| and the contacts |41 and |48 open, which is at the end of the spray stroke. This opens the circuit energized, so that the switches |63 and |64 open under the force of the springs |81 and |68, thus opening the circuits to the motors 6 and 93 and stopping the conveyor and the carriage .at the end of the spraying stroke, the spraying being also stopped because .of the rocker arm being rocked by the cam 6|. Ii it be assumed that switch |29 be opened (switch |28 being closed) and with the carriage at some intermediate point of the spray stroke, the circuit |46|461 is in closed condition, and the contacts are closed.' As soon as the rocker arm is rocked by the cam at the end of the spray stroke. the solenoid |19 becomes deenergized and the switches |53 and the motors 6 and 93 stop, thus stopping the conveyor and the carriage at stroke. y

If both switches 29 and |29 be opened together the operation `is obvious from the above descrip.- tion. f'I'he values of the solenoids |69 and |19 and the strengthof the spring |61 are such that it is necessary that both solenoids be energized to hold the vswitches |63 and |64 closed against the force of the spring |61, and that when one solenoid is deenergized the other solenoid is not sufficiently strong to hold the switchesl |63 and |64 closed against the force of the spring |61.

The circuit |26 to the conveyor motor 6 (Fig. 112 preferably has an overload circuit breaker |62 of any suitable type and so associated with the switch |29 (of'any suitable type) as toV cause the end oi the spray an opening of the circuit |26 upon .tlml jamming.

or otherwise preventing the proper driving of the conveyor.

In cases where long narrow objects are to be sprayed, it may be desired to take advantage of a greater portion of the mechanical stroke of thecarriage during which to effect the spraying, or, in other words, a longer spray stroke may be desired than would occur if the reciprocation were straight across the width of the article. vFor this purpose the carriage support of Fig. 4 and the members carried by it may be supported for rotation about a vertical axis so that the spraying stroke may adjustably be at varying angles to the line of travel of the article on the conveyor. Thus, in Figs. 12 and 13 standards 2| and 22 are mounted upon a turntable |54 rotatable about a center shaft |52 and on a circular track |53, the pedestals 23 and 24 of the standards 2| and 22 being secured to the rim portion of turntable |54 by suitable means, as bolts |55. To the lower side of the rim portion of turntable |54 are fixed brackets |56 and |57 rotatably carrying flanged rollers |58 riding on the circular track |53. At the center the turntable has a bearing hub |59 turnable on a bearing means |60 carried by a supporting hub |6|. The rest of the device is identical to that described above'. By turning the turntable about as desired the cross beam may be brought to any given angle with reference to the line of travel of the piece to be sprayed. Reference is made to Fig. 15 for showing the diierent spray paths obtained, the spray path S, when the reciprocation is straight across a narrow piece or article |2 a being short as compared to the length of the stroke of the carriage and the parts carried by it. When the machine is so positioned as to reciprocate the spraying device at an angle to the line of travel of the piece |2cz, the spray path S1 as shown, will be longer and will be a larger portion of the length of the stroke of reciprocation of the carriage and the parts carried by it. Any suitable means may be used to lock the turntable in ad- Justed position.

The ducts or hoses |22,"i8 and il@ (Fige) preferably extend upwardly and are supported by a clamp H3 of any suitable form, the clamp being suspended from a spring ll/l connected at its upper end to a fixed part, such as the ceiling of the room. This kind of suspension affords a free swinging of the hose segments as the carriage is reciprocated.

While We have herein described and upon the drawings shown a few illustrative embodiments of the invention it is to be understood that the invention is not limited thereto but comprehends other constructions, details, arrangements of parts, features, and the like Without departing from the spirit of the invention.

Having thus disclosed the invention, we claim:

1. A spraying device for spraying coating upon the surfaces of articles, comprising a conveyor for moving the article in a given path and at a given speed, a support located'near said conveyor, a track carried by said support and dispsed transversely' of said path and in given spaced relation thereto, a carriage on said track ing and stopping means comprising a rocker rockably carried by said carriage and having an operative connection to said sprayer, a pneumatic device carried by said carriage and connected to said rocker for operating said rocker in the spray stopping direction thereof, said pneumatic device having a valve for admitting air under pressure thereto, means connected to said valve and to said conveyor for the air admitting operation of said valve upon the stopping of said conveyor.

2. A spraying device for spraying coating upon the surfaces of articles, comprising a conveyor for moving the article in a given path and at a given speed, a support located near said conveyor, a track carried by said support and disposed transversely of said path and in given spaced relation thereto, a carriage on said track' rying said support as to permit the placing of and reciprocable therealong, a sprayer carried" by said carriage, means carried by said carriage and connected to said sprayer for starting and stopping the operation of said sprayer during the reciprocation of said carriage, and means carried by said support and connected to said carriage for reciprocating said carriage, said start-l said support at any given angle to the direction of movement of said conveyor.

3. A spraying machine comprising a conveyor for moving spray-receiving objects in one direction, a track extending above and transversely of the conveyor and at a xed distance with respect to the conveyor on which the objects to be sprayed are conveyed, a carriage mounted for traveling along said track, a spray device assemblage supported by the carriage, means for reciprocating the carriage in timed relation to the movement of the conveyor and with strokes of uniform length, a spray-controlling member carried by the carriage; two actuating members slidably supported by and spaced longitudinally oi the track, the said members being disposed in the path of reciprocation of said spray-controlling member and each adapted to operate the spray-controlling member for discontinuing the spraying; and manually operable means operatively connected to said actuating members and for moving the two actuating members toward or away from each other so as to vary the proportion of the time of each stroke of the carrier during which the spraying is eiected.

4. A spraying device for spraying coating upon surfaces of articles carried by a conveyor in a given path vand at a given speed, comprising a support located near said conveyor, a track carried by said support and disposed transversely of said path and in given fixed spaced relation thereto, a carriage on said track and reciprocable therealong, means carried by said support and connected to said carriage for reciprocating said carriage, a sprayer carried by said carriage: means for determining the time of spraying by said sprayer during the reciprocation of said carriage and sprayer, comprising relatively adjustable spaced cams supported on said support for mutual adjustmentl to and from each other, an operable common element operatively connected to said cams for mutually adjusting said cams to and from each other when said common element is operated and when said track is in a given fixed distance with respect to the conveyor on which the articles to be sprayed are conveyed, a spring pressed movable member carried by said carriage and operatively connected'to said sprayaacauoe V 7 surfaces of articles carried by a conveyor in a given path and at a given-speed, comprising a supportlocated near said conveyona track carried by said support and disposed transversely of said path and in given fixed spaced relation thereto, a carriage on said track and reciprocable therealong, means carried by said'support and connected to said carriage for reciprocating said carriage, a sprayer carried `by said carriage;

able spaced cams supported on said support for l mutual adjustment to and from each other an operable common element operatively connected to said cams for mutually adjusting said cams to and from each other when said common element is operated and when said track` is in a l given iixed distance. with respect to the conveyor on which the articles to be sprayed are conveyed,

a spring pressed rocker pivotally mounted on said carriage to rock in a plane transverse to the line of reciprocation of said carriage and sprayer and operatively connected at an end thereof' to said means for determining the time of spraying by said sprayer during the reciprocation of said cari'iage and sprayer, comprising relatively adjustable spaced cams supported on said support for mutual adjustment to and from each other, an operable common element operatively connected Vto and extendingjtrom one to the other of said cams for mutually adjusting said cams to and from each other when said common element is operated and when said track is in a given fixed distance with respect to the conveyor on whichthe articles to be sprayed are conveyed, a spring pressed movable member carried by said carriage and operatively connected to said sprayer, said member having a part so located as tonormaily move in the space between `said cams and to alternately engage said adjusted cams during the reciprocation of said carriage and sprayer.

6. A spraying device for spraying coating upon surfaces of articles carried by `a conveybr in a given path and at a given speed, comprising 'a support located near said conveyor, a track carried by said support and disposed transversely of said path and in given ilxed spaced relation thereto, a carriage on said track and reciprocable therealong, means carried by said support and l connected to said carriage for reciprocating said carriage, a sprayer carried by said carriage;

' means for determiningthe time of spraying -by said sprayervduring the reciprocation of said car; rlage and sprayer, comprising relatively adjustable spaced cams supported on said support for mutual adjustment to and from each other, an

operable common element operatively connected to and carried by said cams, for mutually adjusting said cams to and from each other when said common element is operated and when said track is in a given fixed distance with respect to the conveyor on which the` articles to be sprayed are conveyed, a spring pressed'movable member sprayer, 'said rocker having its other endso located as to normally move in the space between said cams and to alternately engage said adjusted cams during the reciprocation of said carriage.

8. lA spraying devicefor spraying coating upon thesurfaces of articles, comprising a' conveyor for moving the article in a given path and at a given speed, a support located near said conveyor, a track carried by said support and disposed transversely of said path and in given iixed spaced relation thereto, a carriage on,said track and reciprocable therealong,vmeans carried by said support and connected to said carriage for reciprocating said carriage, an electric motor for operating the latter means, a sprayer carried by stopping means comprising relatively adjustable carried by said carriage and operatively connected to said sprayer, said member having a part so located as to normally move inthe space between said cams and to alternately engage said adjusted cams during the reciprocation of said ,Clliage and Sprayer.

7. .A spraying device for spraying coating'upon surfaces of articles'carried bya conveyor in a l given path land 'at a given speed, comprising a Y said sprayer during the' reciprocation of. said carriage and sprayer, comprising relatively adjustspaced cams supported on said support,` an operable element operatively connected to said cams for adjustmentof said cams to and from each other when said element is operated and when said track is in a given fixed distance with respect to the conveyor on which the articles to be sprayed are conveyed, and a spring pressed movable member carried by said carriage and operatively connected to said sprayer, said member having a part so located as to normally move between said cams and to alternately engage said cams during the reciprocation of said carriage and sprayer; an emergency device associated with said starting and stopping means for independlently starting and stopping the operation of said sprayer, comprising a spring pressed actuating member carried by said carriage and located adjacent to said spring pressed movable member tov act on said spring pressed movable member,van electromagnetic device connected to the circuit of said motor, and an actuating element connected to said electromagnetic device and to said spring pressed actuating member to cause 'the latter to act on said spring pressed movable member when the electromagnet is' deenergized upon the opening of the motor 'circuit to stop the operation of said sprayer.

9. A spraying device for spraying coating upon l carriage and connected to said sprayer for starting and stopping the operation of said sprayer during the reciprocation of said carriage, said starting and stopping means comprising relatively adjustable spaced cams supported on said sup port, an operable element operatively connected to said cams for adjustment of said cams to and from each other when said element is operated and when said track is in a given fixed distance with respect to the conveyor on which the articles to be sprayed are conveyed, and a spring pressed rocker rockably carried by said vcarriage and operatively connected to said sprayer at an end of said rocker, the other end of said rocker being so located as to normally move between said cams and tov alternately engage said cams dur-n ing the reciprocation of said carriage and sprayer; an emergency device associated with said starting and stopping'means for independently start-n ing and stopping the operation of said sprayer, comprising a pneumatically operated device carried by said carriage and located adjacent said rocker to act on said rocker when said pneumatically operated device is operated, an electromagnetic device connected to the circuit of said motor, a valve means operatively connected to said electromagnetic device, pressure iiuid ducts connected to said valve means and to said pneumatically operated device for conducting pressure fluid to and from said pneumatically operated device when said electromagnetic device is deenergized and energized to operate said valve means upon the opening and closing of the circuit of said motor,

SVEND BRAMSEN.

ERIC GUSTAFSSON.

FRED W. WAHLIN.

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