US2266365A - Automatically operated spraying system - Google Patents

Description

Dec. 16, 1941. J. HARRISQN ETAL 2,266,365

AUTOMTICALLY OPERATED SPRAYING SYSTEM Filed Mach 6, 1939 2 sheets-Sheet 1 INVENTOR Dec. 16, 1941. J. HARRISON E-r AL I AUTOMATICALLYQPERATED SPRAYING SYSTEM 2 Sheets-Sheet 2 Filed Mardh e, '1939 @6. www one@ www.. QN.

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Patented Dec. 16, 1941 UNITED STATES John Harrison, Chicago,

and William n.

MacMartin, Lombard, Ill., assignora to Binks Manufacturing Company, Chicago, Ill., a eor' poration of Delaware Application March 6, 1939, Serial )10.260,040

4 Claims.

. The present invention relates to spraying allpliances or systems, particularly of the automatic operating type.

Among the objects of the invention is to provvide a novel system of spraying whereby the 5 spray gun is automatically operated for any given period of time or in any predetermined time relation with the article to be sprayed, such as with respect to the delivery of printed sheets of paper in a process where the spraying is for the purpose of preventing offset in printing. The illustrative embodiment of the present invention comprises generally a spray gun having a nozzle structure with material and airgnozzle portions and material and air passages leading thereto, together with material and air 'valves therein for controlling the discharge of the material and the air from the nomle structure, and with a novel operating means for actuating the device. Such operation is effected by separate and independent motive iiuid in given time relations and under predetermined pressures. The means may be of thepiston or diaphragmatic type, the term piston being used herein in ageneric sense to comprehend a sliding piston and a exing diaphragm. The piston chamber is 4 separated from the air passage leading to the air control valve and has an independently connected passage for the admission of motive uid and Vits release as controlled by a control valve 30 of the three-way type.

'I'he air valve which is normally closed is connected as by a tubular shank passing through the A separating wall between the piston chamber and the air valve structure so as to move with the piston when the latter is acted upon by the mo.- tive fluid or by a spring acting on the piston normally to move the piston forwardly and to close the air valve at the time when the motive uid is released. The material valve has a por- 40 tion which extends into the piston chamber also to be acted upon by the piston in its movements. Such extending portion of the material -valve has a means such as a collar normally in spaced relation with respect to the piston whereby before the piston engages this means it has a predetermined amount of movement or lead, at which time the air valve is opened prior to the opening of the material valve. Conversely, the material valve acted on by a spring will 5o be closed before the material valve is closed.

Another object of the invention is to provide a novel control valve for the motive fluid. This valve has a main and auxiliary valve with a connected to the piston chamber, and has an auxiliary passage connected to the main passage and acting as an exhaust passage. 'I'his valve is preferably operated by a cam and is so constructed as to first close the normally open auxiliary valve and then to open the main valve whereby the motive iiuid passes to the piston chamber to act upon the piston, as above explained. Upon further turning -of the cam, suitable springs return the valves to their normal positions, the main valve seating. rst and then the auxiliary valve opening, whereby the motive uid returns by way of the exhaust passage for release into the atmosphere. In this way the spraying appliance is automatically operated intermittently in time relation with the handling of the means being sprayed.

Other objects, advantages, capabilities, features, and the like, 4are comprehended by the invention as will later appear and as are inherently possessed by the invention.

This is the parent of the copending continuing application of William B. MacMartin, Serial No. 292,187, filed August 28, 1939, for Nozzle structure for spray guns.

Referring to the drawings:

Fig. 1 is a schematic view of a system embodying the invention.

Fig. 2 is a longitudinal sectional view through' a novel spray gun of the present inventio Fig. 3 is a transverse sectional view taken inf a piane represented by line 3-3 of Fig. 2 of the drawings.

Fig. 4 is a sectional view of a three-way control valve forthe motiveuid.

Fig. 5 is a fragmentary sectional view of an alternate. form of spray gunshowing the use of a diaphragm in lieu of asiidingpiston.

Referring more in detail to the drawings, the embodiments selectedto illustrate 'the invention are shown as comprising a spray gun having a body I provided at its forward end with a forwardly widening socket having a mouth portion 2 provided with a flaring annular-seat and with an annular channel 3 within the mouth portion and rearwardly of the seat thereof. The socket also has a base portionl opening into the ma-k terial passage 5 leading from the connection 5, the basev portion! having a flared seat and an annular channel 6 forwardly of such ared seat. 'I'he 'base portion I is of smaller diameter than the mouth portionl. The socket also has an intermediate threaded portion 1 of intermediate diameter and is disposedv between the channels main piassagecontrolled by the main valve and 3 and 6. The channel 6 is in communication with the air passage 8 in body I. In the body I is also provided an air passage 9 which is in communication with the air passage 8 and leads to the channel 3.

Fitted to this socketed forward end portion of the body is a nozzle structure comprising a material nozzle portion and an air nozzle portion. The material nozzle portion comprises a central tubular part I in communication with the material passage and having a tapered rear end II to seat upon the flared seat of the socket base portion 4. 'Ihis part I0 has at its forward end a discharge tip I 2 controlled by a needle valve I3.

The tube part I0 has a concentric portion I4 provided with a threaded portion I5 adapted for securement to the threaded part 1 of the socket and has at its forward end a tapered seat portion I6. Intermediately of said portion I4 is provided a larger diametered annular portion I1 with a rearward tapered seat portion I8 fitting with the flared mouth portion 2 and a forward tapered seat portion I9 so spaced from the seat portion I6 as to provide therebetween an annular air channel 20. A plurality of air passages 2| are provided in the part I4 for connecting the air channel 6 with the air chamber 22 at the front of the material nozzle. portion. Also there are al plurality of passages 23 in the intermediate annular part I1 for connecting the air channel 3 with the air channel 20.

An air nozzle cap 24 has spaced tapered seat portions 25 and 26 which seat upon the seat portions I9 and I6, respectively, with an annular air channel 21 between them and registering with the air channel 20. 'I'he cap has horns 28 with passages 29 and side jet orifices 30 communicating with the channel 21. tral annular air orifice 3|.

The cap is connected in place by a coupling ring 32 threaded to the forward or mouth end of the gun body and to the rear end of the cap by way of a spring locking ring. 'I'his leaves an annular space 33 between the end or mouth part ofthe gun body and the rear end of the cap whereby leakage of air might occur if this space were in communication with any of the air passages of the device. But by seating the parts I8 and I9 against the parts 2 and 25 and providing the air bores 23 in the annular part 1, there is no air communication from the air passages to the space 33. The intermediate portion of the body I is pro- The cap has a cenvided with an air valve structure having a valve chamber 34,.a valve 35 normally closed on the seat 36, a valve outlet 31 leading to an air passage portion 38 which in turn leads to the air passage portion 8. Leading to the valve chamber 34 is an air passage portion 39 in communication with a duct connection or thimble 46.

Rearwardly of the valve chamber 34 is provided a wall or partition 4I in which is screwed a packing or sealing means 42 so bored as slidably to receive the tubular shank 43 of the air valve 35, the rear end of the shank 43 being threaded for securement -to a piston 44. Sealing plugs 45 and 46 are xed inbore portions of the air passage portions 38 and 8, respectively. A hook hole 41 is provided in the upper part of the body I forengagement of a hook when the gun ls to be suspended, a suitable set screw 48 being provided for securing the hook in place.

In the rearward end portion of the' body I is provided a piston chamber 49 having a closure cap 58, the piston being slidable in this chamber.

To the chamber 49 is connected a motive fluid 75 passage connection 5I leading to the chamber space 52 forwardly of the piston 44 and rearwardly of the wall 4I. Rearwardly of the piston is a spring 53acting to normally force the piston forward.

'I'he needle valve I3 has an elongated shank 54 which extends slidably through packing means 55 secured to the forward portion of the gun body, packing means 56 secured to the intermediate portion of the gun body, then through the air valve 34-43, and the piston 44, with a rear threaded end portion 51 extending rearwardly of such piston. yOn the threaded part 51 is adjustably secured a collar 58. This collar is normally spaced from the rear of the piston with a given or predetermined lead. 4On the threaded end 51 is also secured a stop element 59 which may be of tubular form and having a squared head 69 by. which adjustment may be made on the threaded end portion 51 of the needle valve shank. This element 59 serves the purpose of a locking nut for the collar 58 and the' head 64 thereof acts as the contact stop against a head 6I of an adjusting tube 62 threaded in the hub 63 forming a part of the cap 50. A spring 64 is located in the tube 62 between the head 6I and the collar 58 to normally force the needle valve forwardly.

The air to the horns is controlled by a valve device as shown in Fig. 3. Such device comprises a cross bore 65 at the forward end of and in communication with the air passage portion 8. This bore also intersects the air channel 6 and is constantly in communication with the channel. Inwardly is a smaller cross bore 66 which communicates with the cross bore 65 by way of a port controlled by a valve 61. The bore 66 intersects with the air passage 9 and is thus in communication with it. The valve 61 has a smooth stem pgrtion 68, a, threaded portion 69, and a knob 19, the threaded portion 69 being operative in a packing nut 1I secured in the outer end of the cross bore 65. At the inside ofr the nut 1I is a packing 12 backed by a plate 13 against which acts a spring 14 to maintain theV packing leak-tight about the smooth portion of the stem 68, the spring reacting against a washer 15 on the stem 68 and backed by a cross pin 16 fast with the stem 68. By turning the knob 19 the valve 61 may be adjusted to control the amount and the pressure of the air to the horn jet orifices, and hence the desired flattening of the material stream projected from the tip I2.

The motive fluid is controlled by a three-way valve shown in Fig. 4. This valve comprises a .body 11 having an inlet 18, a chamber 19, a

main valve having a valve seat 80, a chamber 8| and an outlet 82. 'I'he main valve seat is normally closed 'by a main valve element 83. The valve 83 has a shank 84 about which is a spring 85 which acts between the valve 83 and a cap 86 at the end of the chamber 19. The valve 83 has a stem 81 with an auxiliary valve element 68 at its end. In an extended portion of the chamber 8I is a slidable tube 89 which has at its inner end a valve seat 98 for seating against the auxiliary valve 88. The tube 89 has a bore 9| and exhaust outlets 92. 'Ihe inner end of the tube has a packing 93 backed by a plate 94 against which acts a spring 95. The latter, besides tending to compress the packing, also acts normally to hold the auxiliary valve seat away from the valve element 88. To the end portion 96 is adjustably secured, as by a lock nut 98, a guide 91. This guide has side eletube 09 slides.

assassin material and air valves respectively in said passages for controlling discharge of material and diameter than the tube 09 so as to present shoulders 89* which contact with shoulders 90 provided on the elements $0, the latter shoulders acting as a limit stop for the outward movement of the tube 09. Also, the extension is slotted and carries a bearing pin I0| upon which is rotatably mounted a roller |02 which roller is located in the -slot of the extension. A cam |03 having a cam lobe |04 is 4so positioned as to operate against this roller.

As the cam |03 rotates and the lobe |04 is brought in contact with the roller |02, the tube 80 is forced inwardly against the force of the spring 05. First there is a closing of the valve seat 00 against the auxiliary valve 00 and then there is an opening of the main valve 03, whereby motive fluid passes through the device by way of the outlet 02 to the passage 5| and the piston chamber '52 forwardly ofthe piston 44. This causes the piston to be moved rearwardly at which time the air valve immediately opens. After the piston M has moved through the lead distance for the needle valve it engages the collar on the needle valve shank and the needle valve is then opened to permit the material to be projected through the tip I2. As the cam lobe |04 turns away from the roller |02, the spring 95 immediately acts Atol move the tube 09 outwardly. The ilrst effect is a closing of the main valve 8 3 under the force of the spring 85, and then an opening of the auxiliary valve under the force of the spring 95 whereby the motive fluid is permitted to exhaust by way of the passage 9| and outlets-92.

Fig. 5 shows a diaphragmatic type of operating means in lieu of a piston type. The piston chamber is of the same general construction as shown in Fig. 2, with the exception that "the diaphragm |05 is clamped at its margin or per-iphery between outward-ly extending flange portions |06 and- |01 of the chamber structure. In all otherrespects the device is the same as shown in Fig. 2.

Referring to Fig. 1, there is shown a ztank or container |08 in which the material to be sprayed is contained under pressure. The material is fed by way of a suitable duct or conduit |00 connected to the thimble 5B. 'I'he air supplied to the air nozzle portion and controlled by the air valve is contained under pressure in a container H0'. It is fed from this container through a suitable reducing valve and by way of a pipe l|| connected to the thimble 40. Air under pressure is always present at the air valve 35, so that upon opening of the air valve there is an immediate supply of the air at the air nozzle portion.

The motive fluid is supplied from any suitable source and is connected to the three-way valve 11. The outlet- 02 of such three-way valveis connected by way of a pipe to the thimble 5|.

While we have herein described and upon the drawings shown preferred embodiments of the invention, it is to be understood that theinvention 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 system comprising a spray gun provided with anozzle structure having material and air nozzle portions and separate material and air passages leading thereto, normally closed air from saidy nozzle portions, said air passage including an air valve chamber, said gun having a piston chamber and a piston movable therein,

a wall for separating said piston chamber and said air valve chamber, and a third passage leading to said piston chamber between said wall and said piston for passage of motive uid independently lthereto and therefrom, resilient means in said piston chamber and acting on said piston for normally forcing said piston forwardly, said air valve being so connected to said piston as to move therewith to open position by action of motive uid on said piston when admitted into said piston chamber and to closed position by action of said resilient means when the motive fluid is released from said piston chamber, said material valve having a portion extending' into said piston chamber rearwardly of said piston, a spring acting on said material valve for normally forcing said valve to closed position, and means on said extending portion of said material valve so located in normally spaced'relation to said piston as to be engaged by s'aid piston when rearwardly moved to open saidimaterial valve subsequently to the opening of said air valve, and when forwardly moved to permit the closing of said material valve prior to the closing ,of said air v alve.

2. A-spraying system comprising a spray gun provided with a nozzle structure having material and air nozzle portions and separate material and air passages leading thereto, normally closed material and air valves respectively in4 ing said piston forwardly, said gun having a partition between said piston chamber and said air valve chamber for separating said chambers, said air valve having a rearward extension slidable through said partition and being-so con-v nected to said piston as to move therewith to open position by action of motive iiuid on said piston when admitted into said piston chamber and to closed position by action of said resilient means when the motive fluid is released from said piston chamber, said material valve having a portion extending into said piston chamber rearwardly of said piston, a spring acting .on said material valve for normally forcing said valve to closedposition," and means on said extending portion of said material valve so located in normally spaced relation to said piston as to be engaged by said piston when rearwardly moved to open said material .valve subsequently to the opening of said air valve, and when forwardly moved to permit the closing of said material valve prior to the closing ofsaid air valve.

3. A spraying system comprising a spray gunprovided with a nozzle structure having material and air nozzle'portlons and separate material and airpassages leading thereto, normally closed material and air valves respectively in said passages for controlling discharge of material and air from said nozzle portions,l said air passage including an air valve chamber, said gun having a piston chamber and a piston movable therein, and a third passage leading to said piston chamber forwardly of said piston for passage of motive fluid independently thereto and therefrom, resilient means in said piston chamber and acting on said piston for normally forcing said piston forwardly, said gun having a partition between said piston chamber and. said air valve chamber for separating said chambers, said air valve being of tubular form with a seat at its forward end and with means at its rear end for connection to said piston, said air valve being slidable through said partition and movable with said piston to open position by action of motive fluid on said piston when admitted into said piston chamber and to closed position by action of said resilient means when the motive iluid is released from said piston chamber, said material valve having a portion extending slidably through said air valve and into said piston chamber rearwardly of said piston, a spring acting-on said material valve for normally forcing said valve to closed position, and means on said extending portion of said material valve so .located in normally spaced relation to said piston as to be engaged by said piston when rearwardly moved to open said material valve subsequently to the opening-of said air valve, and when forwardly moved to permit the closing of said material valve prior to the closing of said air valve.

4. A spray gun comprising a body having a forward portion provided with a nozzle structure comprising material and air nozzle portions, and provided with a material passage leading to the material nozzle portion, said body having an intermediate portion provided with an air valve structure, and with an air passage leading to said valve structure and from said valve structure to said nozzle structure, said body having a rear portion provided with a piston chamber having a forward wall closing off said chamber from said valve structure, a piston movable in said chamber, and provided with a motive iiuid passage leading to said'chamber rearwardly of said wall and forwardly of said piston, a spring acting on said piston to force it forward, means for connecting the valve of the valve structure to the piston to open and close with -the movements of the piston, a spring pressed needle valve for controlling the flow of material through said material nozzle portion, and means on said needle valve so located as to be engaged by the piston for opening the needle valve.

JOHN HARRISON. WILLIAM B. MAeMARTrN.

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