US2103270A

US2103270A - Can spraying machine

Info

Publication number: US2103270A
Application number: US750721A
Authority: US
Inventors: John H Murch
Original assignee: American Can Co
Current assignee: Primerica Inc
Priority date: 1934-10-30
Filing date: 1934-10-30
Publication date: 1937-12-28
Anticipated expiration: 1954-12-28

Description

Dec. 28, 1937. J. H. MURcH 2,103,270

` CAN SPRAYING MACHINE v A l Filed OC'. 30, 1934 i 3 Sheets-Sheet 1 b a, /a Eig- I ATTORNEYS Dec. 28, 1937. J. H. MURCH 2,103,270

CAN SPRAYING MACHINE Filed Oct. 30, 1934 4 3 Sheeucs-Sheet 2 Fig 3 l Dec. 28, 1937.

J. H. Mu'cH CAN SPRAYING MACHINE Filed Oct. 30, 1934 s sheets-sheet 3 .BY SAG* M N ATTORNEYS Patented Dec. 28, 1937 UNITED STATES CAN SPRAYING MACHINE John H. Murch, East Orange, N. J., assignor to American Can Company, New York, N. Y., a

corporation of New Jersey Application October 30, 1934, Serial No. 750,721

chines and has particular reference to machines for spraying or coating interior surfaces of containers or cans with a liquid coating materialk 'which is sprayed on in a manner which builds up 'a coating in stages and on different sections of the surfaces so that an even and unbroken coated surface results.

An object of the invention is the provision of a can spraying machine wherein different sections of surfaces of cans to be coated are independently sprayed and the sectional coatings are then merged one into the other so that complete and thorough coverage of the desired surface is assured.

Another object is the provision of a spraying machine wherein open-end cans are rotated first in one direction and then in an opposite direction during the application of successive coats of material, this procedure insuring that the coating is applied to the inner corner of the can where lthe can bottom joins with the side wall and where the bottom surface coating merges with that of the sides so as to effectively coat this part of the can which is particularly vulnerable to coat- .ing imperfections by ordinary coating methods.

Numerous'other objects and advantages of the' invention will be apparent as it is better understood from the following description, which, taken in connection with the accompanying drawings, discloses a preferred embodiment thereof.

Referring to the drawings:

Figure 1 is a iront elevation of the upper part of a can spray machine embodying the instant invention, parts being broken away;

Fig. 2 is a sectional plan view of the same taken substantially along the line 2--2 in Fig. 1;

Fig. 3 is a side elevation of the left side of the machine shown in Fig. 1;

Fig. 4 is a 'sectional plan view taken substantialiy along the broken line 4-4.in Fig. 3;

Fig. 5 is a transverse sectional view taken subs tantially along the line 5--5 in Fig. 3; and

Fig. 6 is a wiring. diagram of an electric circuit utilized in the machine.

The cans to be coated are introduced into the apparatus by an inclined runway the machine end of which terminates adjacent the periphery of an intermittently rotatable can carrier or turret having can pockets into which the cans are individually delivered. Each can enters its turret pocket at a can receiving station A (Fig. 1).

The turret on its first step movement conveys the can rst to an idle station B. On its second advancement it comes into a spraying station C and in that position its bottom end is located in front of a movable electro-magnetic chuck which is continuously rotated at a high speed. The

. chuck moves into engagement with the can bottom and magnetically picks up and holds the can which immediately starts revolving about its longitudinal axis. 'I'his is in a counter-clockwise direction as viewed from the front of the machine (Figs. 1 and 5').

The open or top end of the revolving can at this station is adjacent the discharge end of an oscillating spray head, which thereupon projects a jet or spray of liquid coating material into the can and against-the interior surface of its bottom. The spray is first directed toward the outer edge of the bottom and particularly into the corner of the rotating can where its bottom wall joins with the side wall (see the dot and dash lines of Fig. 4) and is then moved toward the center of the can (full lines Fig. 4).

This corner is a section of the can which under ordinary-coating methods may be insuiiiciently covered owing'to the tendency of the coating material under capillary attraction and surface tension to pull across between bottom and side walls and leave an uncoated space or skip. This will be again referred to.

This spraying of the bottom continues for a desired number of revolutions of the cam after which the spray is shut 01T leaving the inside of the can bottom covered with an even coating Aof material. The magnetic chuck then returnsto its first position during which movement the can is stripped off by a stationary plate. It stops turning and rests in its turret Vpocket ready for the` next step.

The turret next conveys the now partially coated can to astation D where it passes in between a second rotating electro-magnetic chuck and a reciprocating spray head. The chuck at station D is identical in construction and operation with the one at station C and engages and rotates the can in the same manner only this .time in an opposite or clockwise direction (Figs.

1 and 5) At station D the open or top end of the' can is in front ot the discharge end of the spray head and this head now moves into the can. At its innermost position (Fig, 2) the coating material is ejected as a spray from the head and is directed at an angle into the joint or corner where can bottom and side walls join. The' several times the coatingis directly applied to and flows along the upper edge of the seam and into the interstices between seam and can wall,

as well as over the entire surface of the side seam. This is another can section which when coated by ordinary methods is likely to be improperly covered owing to the tendency of coating material under capillary attraction and surface tension to span across the groove alongside of the seam. This will be further explained in the following description.

As the withdrawing spray end of the head reaches the outer flanged end of the can, the spray is cut off but some of the material flows out and covers the flange itself.. The spray fumes and any excess spray not applied to the can surfaces at this place are carried oi through an exhaust duct. As before the can is stripped from the chuck, stops its rotation and rests within the turret pocket ready for its next advancement.

The moving turret now carries the can to a station E where it passes between a third rotating magnetic chuck and a second reciprocating spray head. Again the can is engaged and rotated by the magnetic chuck only this time the can turns in a counter-clockwise direction (Figs. 1 and 5). The same type of spraying action is here repeated asthe spray head moves in and out, the coating material being deposited directly over the still moist former coating. Gravity, acting on the applied coating which flows down as the can wall moves in its opposite direction,

'brings the material against the opposite edge of the side seam and again into all interstices between seam and side walls.

The same can being th-us rotated in opposite directions at different stations receives its coating material in a manner which is particularly effective for covering both longitudinal edges as well as the inner or top face of the side seam and. well into the interstices along both edges of the side seam where it joins with the can wall. 'I'hus the interior surface of the bottom, the full interior surface of the side walls including the side seam and the inside of the ilange at the open end of the can are all evenly coated. The corner or junction of the bottom and side wall receives three separate overlapping applications of the coating material which insur the proper covering of this important and vulnerable part of the can. A preferred form of apparatus which is disclosed in the drawings comprises in part a turret II (Figs. 1, 2, 3 and 4) composed of a pair of spaced parallel discs I2 lwhich are mounted on a horizontal shaft I3. The shaft is intermittently rotated in any suitable manner and is carried in a bearing I4 formed in a main frame llwhih is the main support for the various working parts of the machine.

Cans a having a bottom end b and an inwardly projected side seam c (Fig. 5) are brought into the top oi' the machine andinto the can receiving station A, these cans rolling in a continuous procession along an inclined runway I6 (Figs. 1 and 3). The runway comprises spacedI and parallel can guides Il having their lower or machine ends secured to brackets I3 which in turn are bolted to the top of the machine frame I5. This end of the runway terminates adjacent the periphery of the turret II and the lowermost can in the runway rests on or in theturret holding the other cans back. j

The turret discs I2 are formed with can pockets 2I and at each rest period of the turret a can pocket is brought into can receiving position (station A) and the lowermost can a in the runway drops into the pocket. On the next step rotation of the turret this can is advanced to the idle station B.

During the next movement of the turret which carries the can from station B into station C, the can is brought into engagement with a pair oi' outer spaced and curved guide bars 22, 23 (Fig. 3) which extend adjacent the turret through stations C, D and E. These bars hold the can in its pocket throughout the remainder of its passage through the machine and until it is fully coated and discharged. At their upper ends the guide bars are mounted on a short shaft 24 which projects from and is carried in a boss 25 formed integrally with themain frame adjacent its top. At their lower-ends the guide bars are provided with depending feet 26 which are bolted to a table portion 21 of the main frame; This frame and is'located under the turret.

At the spraying station C the can is in horizontal alignment with a rotating electromagnetic chuck 3| (Fig. 4) its bottom end being adjacent the face of the chuck. The chuck 3| is mounted on the end of a short hollow horizontal shaft 32 which is carried in a bearing 33 formed in a bracket 34. Thisbracket is part of a horizontally disposed can slide 35 which has movement in a guideway 36 (Fig. 1) formed in the lower part of the main frame I5 adjacent the table portion 21.

With the can at station C and the turret on its rest period, the slide 35 moves forward and brings the chuck 3| intoholdingengagement with the bottom of the can, the slide being operated in any suitable manner.

The magnetism of the chuck for holding the can is effected by electrical energy supplied thereto along wires 31 (Fig. 3) which connect with electrical brushes 38 bolted to a shelf 4I formed on the side of the bracket 34. This provides the stationary element. 'Ihe brushes contact insulated rings 42 which are mounted on the end of and turn with the hollow shaft 32, the rings being adjacent the bearing 33. These rings are electrically connected with the chuck by wires 43 which extend inside of the shaft. This is the movable part of the chuck assembly.

While thus held on thel chuck the can is rapidly rotated in its turret pocket 2l in a counter-clockwise direction l(Fig. 1). Rotation oi' the chuck is eifected by a gear 45 (Figs. 3 and 5) which is mounted on the shaft 32 just back of the chuck. Gear 45 meshes with and is driven by a gear 46 which .is mounted on a drive shaft 41 journalled in a bearing 43 formed in the bracket 34 this being bltlwthe beating 33. 'I'he shaft 41 is, therefore,

ginning (dot and dash lines Fig. 4) particularly nul nozzle 52 and a hollow body 53. 'The spray body is pivotally mounted on a stud 54 carried in a bess 55 formed on the top of a bracket 56 which extends up from the table 21.

Thenozzle is equipped with a suitable needle valve that is operated by compressed air so that when the valve is open a coating material is discharged from the spray head and when closed no spraying takes place. This needle valve may be operated from a pressure cylinder 51 which is directly behind the spray head. The valved, aircontrolled spray head herein referred to may be one of several well known constructions and it is believed that for the present purposes further details are unnecessary.

The cylinder 51 is securedto the end of the `spray head body andis connected with one end of -a compressed air pipe 58 which leads to a needle Vvalve control device 59 graphically indicated in Fig. 6. Here it is shown in its association With an electric circuit used in electrically operating all of ihe spray heads. This will befully explained in connection with a description f the wiring diagram of Fig. 6 which will be. given later.

'I'he spray head body 53 is connected with the ends of two other pipes 6l, 62. Pipe 6l connects with a source of supply of liquid coating material which may be forced under pressure in any suitable manner to deliver it to the nozzle 52. The

pipe 62 is a compressed air supply pipe for bringing the air into the nozzle for atomizing and ejecting the coating material therefrom when the valve is open. These are usual features of such spray heads.

While the can is being rapidly rotated with the chuck at station C, the nozzle needle valve is opened and a spray of coating material is projected into the can (Fig. 4) strikingy against its bottom. During this spraying operation the nozzle is oscillated to cover the entire inner surface of the can bottom its position at the bedirecting the coating into the corner between bottom and sidewalls as has already been suggested.

The oscillation of the spray head is eiected by an arm 65 (Figs. 3 and 4) which is pivoted on the pivot stud 54 and is secured to the head body i Y 53 by a screw 66. The opposite end of the arm connects with a link 61 which in turn is actuated by a suitable moving part of the machine fuller details of which are not necessary for my present purpose. The flow of spray materal is cut oit when th spray head is in the full line position of Fig. t

and any atomized spray or fumes circulating in the air around the nozzle end or in the can after the completion of the spraying operation are carried off through an exhaust duct 68 which surrounds the open end of the can and the nozzle end of the spray head. This duct is secured to the Thev from the turret and insa doing the outer edge' of the bottom of vthe rotating chucked can engages a stripper plate 1l (Fig. 4) which pulls it o of the chuck and leaves it in its turret pocket. It

thereupon 4stops turning. The stripper plate is secured to the back of the curved guide bar .23 by shouldered bolts 12 and is provided with an opening 13 just a little larger than the chuck but too small for the canto pass through.

The turret on its next step of rotation presents CIIy the partially coated or bottom coated canto the spraying stationD. Here the can is located between a second rotating electro-magnetic chuck y 8l and a'second spraying head-B2.these being similar to the chuck and spray head of station C just described. The spray head 82, however, is offset from the center of the can as best shown in Fig. 2 and does not os'cillate as the head 5l.

The rotating chuck 8l is mounted on the forward end of the drive shaft 41 adjacent the gear .46 and is therefore carried on the slide 35. It receives its magnetic energy `by way of wires 83 (Figs. 2 and 4) which are disposed inside of the hollow rotating shaft 41 and which connect with insulated rings 84 (Fig. 3). yThis constitutes the 8l into holding engagement with the can bottom the chuck passing through an opening 88 cut through the stripper plate 1|. The can upon engaging with the rotating chuck rotates theref with, this being in a clockwise direction (Figs. 1

and 5). The spray head 82 is then moved into the can, performing the spraying action (see Fig. 2).

The head 82 is mounted on the top of a bracket 9| and the latter extends up from a dovetail bottom 92 which slides in a guideway 93 formed in the'top of the table 21. The bracket is moved toward the can by a horizontal actuating rod 94 one end of which is threadedly engaged with the bottom 92. This rod slides in a bearing 85 of the main frame and is actuated by any suitable moving part of the machine.

The spray head 82, like the spray head 5I, is of the compressed air type and comprises a nozzle 91 and a hollowbody 98 which is bolted to and carried by the bracket 9|. stream of coating material toward the front and the outer side of the head and at an angle to the nozzle, this action depositing the coating well into the can corner d when the nozzle is iirst fully inserted into the can (Fig. 2). Discharge of coating material continues during they backward movementv of the spray head which immediately'follows and it is then that thel side wall of the can is fully covered. Since the can wall is moving rapidly past the nozzle as the can rotates the spray is caused to flow well into the edge of the side seam and into., the junction of side seam and can wall.

Nozzle 31 projects a The needle valve of this spray head Vmay also be air operated, as by a pressure cylinder 99. -The cylinder 99 is secured to the end of the spray head body and isI connected with one end of a compressed air pipe |02 which leads to a needle valve control device |03 also graphically indicated in Fig. 6. The operation of this will be fully through the air cylinder 99. 'Ihis switch action will be later described in connection with'the wiring diagram. The can slide 35 is now drawn back which action pulls back the rotating chuck through the stripper plate opening 88 and this strips on* the can leaving it in its turret pocket.

With the next step movement ofthe turret the can movesinto the third spraying station E where its side walls and the bottom joint receive asecond coat. The mechanism at this station is identlcalwith that at the station D just described and the, operation is the same except that the can is rotated in the opposite direction.

At station E the can is picked up and rotated by a magnetic chuck (Fig. 2) and the coating material is delivered by a spray head ||2./ The chuck is mounted on the end of a hollow shaft ||3 carried in a bearing ||4 formed in the-bracket 34. It receives its magnetic energy by means of wires disposed in the hollow shaft, of insulated rings mounted on the shaft and by means of brushes supported on thebracket 34 in the same manner, already described, as for the chuck 8|. The chuck is rotated in its counter-'clockwise direction (Fig. 5) by a gear ||1 (see also Fig. 2) which is mounted on the shaft ||3 just back of the chuck. This gear ||1 meshes with and is driven by the gear 46.

The needle Valve compressed air control for the spray head ||2 utilizes a pipe ||9 (Fig. 1) which connects with a needle valve control device |20 (Fig. 6) and which is associated with a cylinder |2| connected directly with the needle valve of the spray head. The spray head ||2 is also associated with a compressed air pipe |22 (Fig. 1) and a liquid coating material pipe |23.

'I'he head ||2 is also mounted on the slide bracket 9| adjacent to and parallel with the head 82 and its movement into and out of the can during spraying is therefore in unison with the movement of the head`82. In this second application 0f coating the spray material is again directed into the corner d of the can and again the can flange is sprayed as the nozzle is withdrawn this being in addition'to the side wall coating as already described.

By reason of the opposite direction of rotation of the can the other edge of the side seam and the junction between this edge andthe can.

side wall is thoroughly coated this being one of the vulnerable parts of the can as previously pointed out. At the same time the third coat of material is applied to the corner d which is another vulnerable part.

At the next step rotation of the turret the can is carried beyond vthe end of its supporting guides 22, 23and drops out of its turret pocket and into a discharge chute. The discharge chute comprises spaced and parallelangle iron bars |25 disposed on each side of the turret adjacent the station E. At the rear of the turret the bars are bolted `to a boss |26 (Fig. 5) formed on the main frame |5. At the front of the turret they are bolted to a bracket |21 (Figs. l and 2) which is supported by and secured to the table 21. The

bracket |21 also supports an end of the exhaust duct 68. The bars |25 are disposed at an angle and the cans roll by gravity out of the machine and to any suitable place of deposit.

-the can at a station and when so actuated open and close electric circuits which function to control the compressed air and the coating material discharged from the lspray head. The control devices 59, |03vand |20 are selectively utilized at such a time so that the coating material is sprayed into the can at the proper time and only when a can is present and properly placed at a station. v

The rocker detecting members at 'the respective stations C, D and E comprise bell cranks |3|, |32, |33 which are pivotally mounted on the shoulder studs 12 between the stripper plate 1 and the guide rail 23 (Figs. 3 and 4). One arm of each bell crank normally extends into the path -of travel of the can as advanced by the turret Il.,

The other arm of each bell crank engages a spring Aheld movable part of a normally open electric switch.

These electric switches, designated by the numerals |35, |36, |31, (Figs. 5 and 6) are of any The switch |31 of station E is secured to a boss formed on the table 21 of the main frame l5.

'I'he return service Wire |56 connects with one terminal of a. timing switch |51 which is. closed only when the turret is stationary. This switch actuation is performed by a cam |58 which is mounted on a continuously rotating shaft v|59 suitably actuated from a moving part of the machine and in synchronism with the turret movement.

'I'he other terminal of the timing switch |51 connects with one end of a service wire |6|. Lead wires |62, |63, |64 respectively connect this service Wire Withthe needle valve control devices 59, |03, |20. Wires |66, |61, |68 respectively connect the devices 59, |03, |20 with the switches With the service switch |53 closed a can coming into any one of the spraying stations and moving the bell crank there closes its associated Aelectric: switch and when the turret comes to rest and closes the timing switch |51 an electric circuit is completed through the particular needle valve control device associated -with that electric switch.

For example a can at station C has moved the bell crank |3|r so that the switch |35 is closed.

Electric current nowv passes from the generator along the service wire |52, switch |53, wire |55 which connects with one side ofthe switch |35. through the switch |35, along wire |66, through the needle valve control device 56, along wires |62, ISI, timing switch |51 and wires |56, |54, through the service switch back to the generator. This actuates the needle valve control device 59 which opens an air valve and permits air to pass from a main supply pipe |69, which connects with all of the needle valve control devices, through the pipe 58 into' the cylinder 51. This moves the needle' valve stem and opens the needle valve in the nozzle so that a spray of liquid coating material flows through the pipe 5| and air flows through the pipe 62 and the mixture is ejected from the nozzle and into the can.

When the needle valve control device |03 is actuated, therefore, thecurrent passes from the service wire |55 by way of wire |1I, switch |35 and wire |51, through the device and its wire |53 and back to the service wire IBI. Otherwise the rest of the circuit is the same as already described for the device 59. Where the switch |31 at station E is closed, the current then flows from service wire |55 by way of wire |12, switch |31 and wire |68, through the device |20 and its wire |64 and back to the service wire i6 I It will be evident, since each spray head is controlled by its own circuit which is only closed by a can in proper position to be sprayed at each spraying station, that all of the circuits may be closed'simultaneously if there is a can 'at each station. By the same token if there is no can in a particular turret pocket at a spraying station thedetecting rocker member there will not be actuated and no spraying will take place at that particular station.

It is thought that the invention and many of its attendant advantages will be understood from the foregoing description, and it will be apparent that various changes may be made in the form. construction and arrangement of the parts without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the form hereinbefore described being merely a preferred embodiment thereof.

I claim:

1. A spraying machine for coating cans with a liquid coating material comprising in combination, means for carrying open-end cans intermittently and successively through a plurality of spraying stations, meansfor rotating individual cans while at said stations, an oscillating spraying device at one of said stations for coating the interior surface of the bottom of a said rotating can through its open end, means for changing the angle of said spraying device relative to the bottom of said can, a plurality of reciprocating spraying devices at the other of said stations for successively applying a plurality of coats of said coating material to the interior side wall of said cans, and means for moving said reciprocating spraying devices into and out of said cans through their open ends.

2. A spraying machine for -coating cans with a liquid coating material comprising in combination, means for successively positioning open-end cans, having inwardly projecting side seams, at a plurality of spraying stations, means associated with each of said stations for ejecting a spray of said coating material at an angle to strike against a longitudinal edge of said side seam and against the interior side wall of a said positioned can, a

chuck arranged at each of said stations for rotating the positioned can about its longitudinal axis while it is being sprayed, and means for revolving ing said chucks into engagement with and away from said cans while they are in said carryingV means, and a stripper plate for removing a said engagedcan from a said chuck to maintain saidv can in said carrying means.

4. A spraying machine for coating cans with a liquid coating material, comprising an intermittent can carrier, a rotary chuck to which the cans are delivered by said carrier at its intermissions, and a plurality of spraying devices for successively coating, independently of each other, diierent interior surfaces of a can, one of said spraying devicesl being movable within the can relative to the axis of the can for insuring a complete interior coating.

- 5. A spraying machine for coating cans with a liquid coating material, comprising in combination, means for positioning open-end cans for coating, independent spraying devices for successively coating different interior surfaces of the positioned can, one of said spraying devices being movable within the can relative to the axis of the can for insuring a complete interior coating, and means for moving the cans from one movable within the can relative to the axis oi' the can, and means for conveying the cans from one spraying means to another spraying means, and means for inserting the spraying means into the cans.

'1. A spraying machine for coating cans with a liquid coating material, comprising in combination, means for intermittently carrying openend cans successively through a plurality of spraying stations, can rotating means at said stations, automatically acting spraying means associated with each of said stations for coating different surfaces of a said can progressively, one of said spraying means being movable within the can relative to the axis'of the can, and devices for inserting the spraying means into the cans.

8. A spraying machine for coating cans with a liquid coating material comprising in combination, means for'intermittently and successively positioning open-end cans at a plurality of spraying stations in spray receiving position, magnetic chucks at each of said stations for rotating said positioned cans, automatically acting spraying means associated with each of said stations for progressively coating different surfaces of said positioned cans while rotating at said stations, one of said spraying means being movable Within the can relative to the axis of the can, and devices for inserting the 'spraying means into the cans. v

9. A spraying machine for coating cans with a liquid coating material comprising in combination, an intermittently rotary turret for positioning open-end cans in spray receiving position, chucks for receiving and rotating said cans in the intermissions oi' said turret, an oscillatable spraying device for spraying the interior surface of the bottom of a positioned can through its open end, means for oscillating said spraying device so as to direct the spray against a desired portion of said bottom surface, a reciprocable spraying device for spraying the interior surface of the side wall of said ppsitioned can independently of said bottom, and means for moving said reciprocable spraying device into and out of the 4 interior of said can through its open end, said spraying devices being arranged at diierent stations of said turret.

10. A spraying machine for coating cans with a liquid coating material comprising in combination, means for successively rotating a can about its longitudinal axis in opposite directions, including chucks rotated in opposite directions and means for moving the can from one chuck to the other, spraying means for successively coating the interior surface of said can while it is so rotating, said means for moving a can from one of said chucks to the other chuck being intermittent.

11. A spraying machine for coating cans with a liquid coating material comprising in combination, means for placing open-end cans in spray receiving position, means for successively rotating a positioned can about its longitudinal axis in opposite directions,`1ncluding chucks rotated in opposite directions and means for moving the can from one chuck to the other, spraying means for successively coating the interior surface of a said positioned can while so rotating, said means for moving a can from one of said chucks to the other chuck being intermittent.

12. A spraying machine for coating cans with a liquid coating material comprising in combination, means for rotating a can having an inwardly projecting side seam intermittently in opposite directions about its longitudinal axis, a can feeder for feeding cans intermittently to said rotating means, and spraying devices disposed. out of alignment with the longitudinal laxis of said rotating can and insertable therein for ejecting and directing coating material at an angle to and against the side walls of said can for coating the same and for coating the longitudinal side seam edges and the interstices between said edges and the can wall.

13. A spraying machine for coating cans with a liquid coating material comprising in combination, an intermittently movable can carrier for positioning open-end cans having inwardly projecting side seams in spray receiving position, de-

vices for ejecting a spray of said coating material .of said can, and means for rotating a said can about its longitudinal axis rst in one direction and then in the opposite direction while the can is being sprayed, including chucks rotated in .opposite directions and means for moving the can from one chuckto the other so that the side walls, the edges of the side seam and the interstices between the said edges and the can wall are thoroughly covered with said material.

14. A spraying machine for coating cans with liquid coating material, comprising in combination a continuously rotating chuck turning in one direction for presenting open-end cans in spray receiving position, a succeeding chuck for. said purpose and turning continuously in the opposite direction, spraying means for independently coating diierent interior surfaces of a said positioned can, an intermittently turning can feeding tur- -ret for delivering, cans successively to said chucks,

a said positioned can for electrically actuating said spraying means.

16. A spraying machine for coating cans with a liquid coating material, comprising in combination, a can feeding turret'and can rotating chucks for presenting open-end cans in spray receiving position, a plurality of independent spraying means for coating different surfaces of.-

a said positioned can, one of said spraying means having devices for incliningthe axis of the same relative tothe axis of the can, while the spraying means is within the can, means operable by a said positioned can for electrically actuating said spraying means, and controlling means assoelated with said spraying means for controllingv the time and duration of said operation.

17. A spraying machine for coating canswith a liquid coating material comprising in combination, an intermittently movable turret, means independent of the turret for successively rotat- .ing a positioned can about its longitudinal axis in opposite directions, including chucks rotated' in` opposite directions and means for moving the cans from one chuck to the other, and spraying means for applying a coat of said material at the juncture of the can end with the can side wall of a positioned rotating can while the can is being rotated by each chuck.

18. In a can-spraying machine, the combination of an intermittently movable can carrier, rotatable chucks to which the cans are successively delivered by said carrier, means for rotating said chucks continuously in opposite directions, and means near said chucks and insertible into the cans for spraying the interiors of the rotating cans.

19. In a can spraying machine the combination of an intermittently rotary can carrier, chucks rotating in different directions to which chucks the cans are successively delivered at the intermissions of said carrier to be rotated for limited times, first in one direction and then in another Cil direction, spraying means at one chuck for operating on certain parts of a can, and spraying means at another chuck for operating on other parts of the can.

20. In a can spraying machine the combination of an intermittently rotary can carrier,.a chuck rotating in one direction to which chuck the can is delivered by said carrier, spraying means for operating on the can while it is rotated by said chuck, another chuck rotating in4 another direction to which the can is delivered by said carrier after said spraying operation, and spraying means at said'other chuck for 0perating on said can.

JOHN H. MURCH.