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Патент USA US2403994

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July _16, 1946.
2,403,994
4H. J. PAYNTERv
SPRAYING MACHINE
5 Sheets-Sheet 1
Filed June 19, 1944
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July 16, `1946.
H. J. PAYNTER
SPRAYING MACHINE
Filed June 19, 1944
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2,403,994
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5 sheets-sheet 2
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July 16,1946.
H. J. PAYNTER
2,403,994
SPRAYING MACHINE
Filed June 19, 19451j
5 Sheets-Sheet 3
July 16, 1946._
H. J; PAYNTER
i 2,403,994
SPRAYING MACHINE
Filed June 19,
'
5 Sheets-Sheet 5
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JTTOE/YE'YS
2,403,994
Patented July 16, 1946
l
UNITED STATES PATENT OFFICE
2,403,994 n
SPRAYING MAcHiNE
Horace J. Paynter, Union, N. J., assignor to
American Can‘Company, New York, N. Y.,
al
corporation of New Jersey '
Application June 19, 1944, Serial No. 540,927
10 Claims.
.
1
»
This invention relates to a machine for spra -
ing surfaces of articles with a coating material
and has particular reference to varying the quan
tity of coating material in the spray in accord
ance with a variation in the distance between the
point of discharge and the surface being sprayed
to provide an even coating of the material on
(Cl. 91-45)
2
and sharp cut-off of the valve may be had while
the gun is rotating.
Numerous other objects and advantages of the
invention will be apparent as it is better under
stoodfrom the following description, which, taken
in connection With the accompanying drawings,
discloses a preferred embodiment thereof.
Referring to the~ drawings:
such surface.
`
.
Figure 1 is a longitudinal sectional view of prin
In the spray coating of articles, the spray gun
used and the article being sprayed> usually are ll) cipal parts of a spraying machine embodying the
present invention withv parts broken away and
moved relative to each other. When spray coat
showing a spray gun in position prior to insertion
ing irregular shaped articles according to usual
into a can body;
methods, portions of the article which are spaced
Fig. 2 is a rear elevation of the machine shown
farther away from the spray gun receive a thin
ner coating of the sprayed material than do por 15 in Fig'. 1, with partsïbroken away;
Fig. 3 is an enlarged view similar to Fig, l
tions closer to the gun. This results in uneven
showing the spray gun in spraying position Within
coating which in most instances is undesirable.
the can body;
The present invention contemplates overcoming
Figs; 4 and> 5 are transverse sectional views
such difficulties by regulating the discharge from
the gun in d1rect proportion to the distance of the 20 taken substantially along the lines 4-4 and 5-5
in Fig. 1;
sprayed surface from the point of discharge to
Fig. 6 is a perspective detail of parts shown in
control the quantity of coating material sprayed
upon the surface.
An object of the invention is the provision of a
Fig. 3;
Figs. 7 and 8 are transverse sectional views
machine for spraying surfaces with a coating 25 taken substantially along the lines 1_1, 8-8 in
Fig. 3; and
material wherein the quantity of coating material
Fig. 9 is an end View of a rectangular can body
discharged from the spraying devices for appli
indicating. diagrammatically several positions of
cation onto the surfaces is controlled in accord
the spray projected against the inside surface of
ance with the distance between the surface being
the body as an incident to spray> coating such a
sprayed and the spraying devices so that a ñlm of
surface.
>
.
coating material of uniform thickness will be ap
As a preferred embodiment of the instan-t in
plied to all surfaces being sprayed.
vention the drawings illustrate a machine for
Another object is the provision in such a ma
spraying a uniform ñlrn of coating material onto
chine cf devices for effecting relative movement
the
inside surfaces of oblong rectangular sheet
between an irregular shaped article to be sprayed
metal can bodies. However,. the invention is
and a spray gun having an orifice controlled by
equally well adapted' to spraying outer as well as
a needle valve wherein the needle valve is oper
other inner surfaces and to other articles having
ated in time with the movement and in accord'
curved, irregular, or plane surfaces and a more
ance with the distance between the gun and the
varying surfaces of the article to insure the ap 40 or" a less elaborate machine can be used while ful
filling the same principles of invention.
plication to the surfaces of a film of coating
In the instant machine the can bodies, indi
material of uniform thickness.
cated by the letter A,A are carried in a. horizontal
Another object is the provision in a machine
positionfthroug'h a vertically disposed circular
of this character of a valve controlled spray gun
path of travel which extends through a spraying
which is rotatable and insertableinto an article
station' X (Figs. 1 and'2). The bodies are ad
of irregular contour while the article is held sta
vanced in an intermittent or step-by-step man_
tionary for spraying the inside surface of the
ner and come to rest individually at the spraying
article while varying the quantity of coating ma
station for the spraying operation. While at the
terial discharged from - the gun in accordance
spraying station, a continuously rotating horizon
with the contour of the article so that a ñlm of 50
tally disposed spray gun B then in line with the
coating material of uniform thickness maybe
applied to the surfaces.
Another object is the provision in such a ma
chine of control devices for the valve in the spray
gun wherein quick opening, sensitive regulation,
middle of the can body at rest in the station,
moves into and out of the body and sprays its
interior' walls. Such a gun has a discharge nozzle
arranged to direct a single spray against a side
2,403,994
3
4
wall of the body. During this spraying opera
tion the quantity of coating material discharged
by a spur gear 5| (Figs. 1 and 3) which surrounds
from the nozzle is controlled in accordance with
the distance between the nozzle and the wall
the gun and which is keyed in place on the gun.
This gear meshes with and is driven by a. gear
being sprayed, It is this controlled operation of
52 which is formed integrally with a wide driving
the spray that results in the uniform applica
tion of the coating material.
_
ì
gear 53 constituting a composite gear unit. This
lcomposite gear unit is mounted loosely on the
u
In the instant case where the can body has
an oblong rectangular cross section, as best shown
'turret shaft 23 between a pair of retaining bear
ings 55, 56 formed on the slide bracket 45. The
in'Fig. 9, the distance between the parts of the
surface being sprayed and the nozzle varies as ^ ‘ '
the spray gun rotates within the body.
The far-` „ .
ther away the surface is from the nozzle, the
greater will be the area of wall spacecovered -' ‘
by the spray from the nozzle and accordingly the
less dense the spray will be. The diagrammatic
showing of diñerent locations of the spray stream
in Fig. 9 graphically indicates this. With a con
stant spray as used in >conventional practices, a
thinner film of coating» material will be applied
to the more distant surface parts of the body
since the spray stream is spread out over a
greater surface.
In the instant invention this Variation in dis
tance is utilized for controlling the nozzle dis
charge so that an increased quantity of coating
material will be ejected from the nozzle as the
distance between the nozzle and the area sprayed
increases.
In this manner a uniform film of even
.
Rotation of the spray gun B is brought about
retaining `bearings provide support for` the turret
shaft intermediate its main .bearings 24, 25 and
also retain the composite gear unit in place within
the slide when the latter moves, as` will be here
inafter explained. The composite gear unit is
' .continuously rotated by a main driving gear 51
carried on the inner en-d of the drive shaft 3|.
The spray gun B is shifted into and out of
the can body A for the spraying operation by
movement of the slide bracket 45 along its slide
ways 41 while the body is at rest at the .spraying
station. This movement of the slide bracket is
brought about by cam action. For this purpose
the slide bracket carries a cam roller 6| which
operates in a cam groove 62 formed in a barrel
cam 63 mounted on and continuously rotated by
the drive shaft 3|. The cam shifts the slide
bracket and the spray gun carried thereon when
the carrier turret 2| is at rest.
-
Referring now to the details of the spray gun
thickness of the coating material is applied to the 30 itself it will be observed that it is made up pri
body surface regardless of the contour of the body
marily of an outer cylindrical shell 65 (Figs. 3
being sprayed. .
'
r‘and ’1) and an inner tube member 66 concentri
Reference'will now be had to a more detailed
4cally disposed within the shell and in spaced
description of the machine and its operation.
relation. This construction sets olf an annular
Movement of the can bodies A through a circular
air passageway 61 therebetween. The outer ends
path of travel toward and away from the spray
.of the shell and the tube member, i. e., the end
ing station is effected by a rotatable carrier tur
adjacent theturret 2|, are secured in a, nozzle
ret 2| (Figs. 1, 3 and '1) having a plurality of
head 68. The nozzle head is formed with a, ta
pockets 22 which are spaced aroundthe periph
pered valve seat embodied in Aa needle valve 1|
ery of the turret and in which the can bodies are
which is located at the horizontal center of the
carried. The bodies are deposited in the turret
tube member 66.
.
pockets and are ejected therefrom in any suit
-l-Iead
68’is
formed
with
an L-shaped channel
able manner.
12 adjacent to and on one side of the valve seat.
The carrier turret 2| is mounted on the outer
The horizontal leg of the channel communicates
end of a horizontal turret shaft 23 (see also Fig. 45 lwith
the annular air passageway 61 while the
2) which is carried in a pair of spaced bearings
vertical leg of the channel terminates adjacent
24, 25 formed in brackets 26 which extend up
-the outer end of the tapered Valve seat and is
from opposite ends of a frame 21. This latter
disposed at right angles to the valve thus pro~
constitutes the main frame of the machine.
‘viding a. single outlet. The inner or opposite end
The turret shaft 23 and the turret 2| carried 50
of the shell 65 carries a stuffing box nut 15 which
thereon are intermittently rotated by a conven
surrounds the tube member 66 and which holds
tional indexing device located at the end of 'the
a tapered sealing gasket 1G in place between the
machine opposite the turret. The indexing de
shell
and the tube member. This seals the inner
vice includes a Geneva wheel 28 (see also Fig. 5)
and a cooperating Geneva actuating arm 29. 55 end of the passageway 61.
Compressed air is introduced into the air pas
The Geneva wheel is mounted on the turret shaft
sageway
51 by way of a pipe 8| which leads from
23. The Geneva arm 29 is secured to one end
any suitable source of compressed air. The gun
of a drive shaft 3| journaled in spaced bearings
end of the pipe is threadedly connected into the
32, 33 (Fig. 1) formed in the main frame of the
machine. The ydrive shaft may be driven from 60 upper> half of the split bearing 42 and communi
an outside source of power in any suitable man
ner, as for example through a gear 34 -mounted
on the outer end of the shaft.
cates with a recess 62 formed in the bearing.
A port 83 in the gun shell 65 constitutes a con
nection from the bearing recess to the air pas
sageway 61 and directs now of air from the
The spray gun B at the spraying station X of
the machine is disposed in a horizontal position 65 recess into the passageway as the gun rotates.
A flexible ring stufûn-g box device 64 is located
in line withvthe middleof a can body brought to
in theV bearing recess 82 and surrounds the outer
rest at this station by the turret 2|. The gun at
shell 65 of the gun. This prevents leakage of air
all times is parallel to the turret shaft 23. The
pastthe bearing. The stuiiing box device is held
gun in general is cylindrical in shape and vis
in place by a collar nut 85 threadedly engaged
mounted for rotation in a pair of longitudinally
in one end of the bearing 42.
spaced split bearings 4| , 42 formed in a horizontal
Compressed air introduced into the circular air
slide bracket 45 (Figs. 1, 3 and 4). The slide
passageway 61 flows along the length of the gun
bracket is formed with slide tongues 46 (see also
and into the L-shaped channel 12 in the nozzle
Fig. 5) which operate in longitudinal slideways
¿i1 in the main frame 21.
.
head 68. The air continually discharges from the
outlet end of >the channel in a single jet issuing
7
.2,403,994
8
in a cam groove |67 of a face cam |68 formed in
This cam surface is shaped in accordance with
the contour of the can body being sprayed, i. e.,
the outer end of the slide bracket barrel cam 63.
The timing of the face cam |68 is thus tied-in
with the rotation of the barrel cam 63 and with
in accordance with the distance the spray stream
must travel at any moment during the gun’s
the reciprocationof the slide bracket 45.
rotation.
Hence on a forward stroke of the slide bracket
45 to insert the spray gun B into the can body
A to be sprayed, the face cam |68 rocks the cam
lever |55 and the arm |62 and thus lifts the foot
Since the control cam is formed as a part of
the valve rod and rotates with the spray gun it
is always in time with the single jet of spray
issuing from the gun nozzle and this insures ac
|58 formed thereon. These parts remain in this 10 curate registration of the parts involved in spray
position during the entire spraying operation.
ing the irregular surface of the body. It is this
This lifting of the foot through the actuating
control cam that insures the application to the
roller |57 thus rocks the bell crank |53 in a clock
inner surface of the can body, of a ñlm of coating
wise direction (Fig. 3). This movement of the
material having a uniform thickness extending
bell crank draws the plunger |45 outwardly and 15 over the entire surface sprayed, as hereinbefore
shifts the valve actuating sleeve ||| outwardly
explained.
through the yielding action of the spring |45.
It is thought that the invention and many of
The yielding action of the compression spring
|46 compensates for any overthrow 0f the face
its attendant advantages will be understood from
the foregoing description, and it will be apparent
cam |68 and permits full operation of the cam 20 that various changes may be made in the form,
|68 even after the movement of the sleeve in its
construction and arrangement of the parts with
bearing H2 is arrested by the stopy screw |4l.
out departing from the spirit and scope of the
This yielding feature permits of accurate adjust
invention or sacrificing al1 of its material ad
ment for the amount of initial opening of the
vantages, the form hereinbefore described being
needle valve `|| by utilizing the stop screw to reg 25 merely a preferred embodiment thereof.
ulate the travel of the sleeve.
I claim:
The sleeve movement affects the movement of
l. In a machine for spraying a coating mate
the valve rod Si to open the valve by the cam
rial on a surface, the combination of an elongated
roller |36 moving with the sleeve, This roller
spray gun having a discharge orifice, said gun
presses against the valve control cam surface |35 30 being rotatable on its longitudinal axis, the sur
on the rotating flange ||5 of the valve stem |0|.
face sprayed being stationary and said gun hav
Movement is toward the right asin Fig- 3. Spring
|3| is compressed and the rotating disc H8 is
pressed tightly against lthe stationary stop plate
|2 |. The longitudinal movement imparted to the 35
valve rod Eil withdraws the valve face Q6 from its
seat and thus opens the discharge valve 1|. The
coating material under pressure within the tube
member 86 thus discharges from the valve.
ing longitudinal movement relative to said sur
face at different distances throughout a spraying
operation, a valve rod located in said gun for con
trolling the effective size of said orifice, means
mounted adjacent said gun for moving said valve
rod in opposite directions respectively to open and
close said orifice, and means operating adjacent
said gun in accordance with the relative distances
The air issuing from the outlet end of the 40 between the gun and the surface 'being sprayed
channel ‘l2 adjacent the valve 1| blows the dis
.- for altering the position of said valve rod when
charging coating material into a spray of finely
said orifice is open to vary the size of said orifice
divided particles and projects it at right angles to
and thus control the quantity of coating material
the nozzle and against the inside surface of the
passing through said orifice to insure a coating
can body A. This spray continues while the gun
of even thickness on the said surface.
moves forward (toward the left as in Fig. 3)
2. In a machine for spraying a coating mate
into and through the body and also while the gun
rial on the surface of »an irregular shaped tubular
moves back in a return stroke. Thus the entire
article, the combination of an elongated spray
inner surface is covered with a ñlm of the coat
gun having a discharge orifice, said gun being
ing material.
.
60 rotatable on its longitudinal axis, the tubular
As the nozzle leaves the edge of the sprayed
article being stationary While being sprayed and
can body, on the return stroke of the gun, the
valve il is immediately closed to prevent waste
of coating material. This is brought about by
said gun being longitudinally movable relative
to said article being sprayed at different distances
from the gun, a valve rod located in said gun for
a reverse Shifting of the actuating sleeve ||| 65 rcontrolling the effective size of said orifice, means
which now moves toward the left, as viewed in
mounted adjacent said gun for moving said valve
Fig. 3. This is brought about by lowering of the
rod in opposite directions respectively to open and
foot |58 which first relieves the pressure on the
close said orifice, and devices disposed adjacent
spring |45 whereupon the sleeve ||| is free to
said gun and having a shape corresponding to
move. The spring |3| now becomes thiprime 60 the contour of the article surface being sprayed
mover and forces the valve rod 97 forward (left)
and operating in accordance with the relative
first reseating the valve face 36. This closes the
distances between the gun and the surface being
valve.
sprayed for altering the position of said valve rod
The description of the opening and closing of
when the orifice is open to control the quantity
the discharge valve '|| up to the present time has 65 of coating material passing therethrough t0 in
not included the further control of the discharge
sure a coating of uniform thickness on the said
valve 'H to insure the discharge of the coating
article.
material in carefully measured amounts in ac
3. In a machine for spraying a coating mate
rial on the interior surface of an irregular shaped
the nozzle head 68 and the wall of the can body 70
tubular can body, the combination of an elon
being sprayed. This additional partial opening
cordance with the distance intervening between
and closing of the discharge valve is brought
about by cam surface |35 on the rotating fiange
||5 of the valve rod stem |01 operating over the
roller |36 then rotating on a stationary axis.
gated spray gun having an orifice for discharging
a coating material and an air orifice for ejecting
a blast of air at an angle to said discharge orifice
for spraying the discharged coating material
laterally of said gun onto said can body While the
2,403,994.
9T
10
interior surface thereof, a valve rod located in
latter is stationary, said gun being> movable into
said gun for controlling the effective size of said
said can body and having rotation on its longi
orifice, means for shifting the ,sleeve independ
tudinal axis throughout a spraying operation, a
ently of the slide to move said valve rod to open
valve rod located in said gun for controlling the
and close said orifice, and devices carried by
effective size of said orifice, `means mounted ad
said sleeve and operable in accordance with the
jacent said gun for moving said valve rod to open
distance between the gun and that portion of
and close said orifice, and devices connecting with
the interior surface of the stationary can body
said valve rod and rotatable with said gun and
being
sprayed for shifting the valve rod after the
operating in accordance with the distance be
tween the gun and that portion of the surface 10 orifice is open for altering the size of said orifice
to control the quantity of spraying material dis
of the can body being sprayed for altering the
charging therefrom to -provide an even thickness
size of said orifice to controlv the quantity of
coating material discharging therefrom, whereby
a uniform thickness of coating material is applied
to the interior surface of the can body irrespec
tive of the varying distances of the sprayed sur
faces of the can body from said spray gun orifice.
4. In a machine for spraying a coating mate
rial on the interior surface of an irregular shaped
tubular can body, the combination of an elon
gated spray gun having a discharge orifice, said
gun being rotatable on its longitudinal axis and
longitudinal movement into and out of
the can body while the latter is held stationary
for a spraying operation, a valve rod located in
said gun for controlling discharge of coating
material from said orifice, means disposed adja
cent said gun for closing said valve rod against
said orifice, a cam located adjacent said gun and
rotatable therewith, said cam having a surface
contour which is variable in accordance with the
relative distances between the said orifice and the
can body surface for preventing the operation of
said valve closing means and for changing the
position of said valve rod to vary the quantity of
coating material discharging from said orifice so
as to provide an even thickness of coating on said
can body surface, and means for rendering said
cam ineffective when said valve closing means
becomes effective.
coating on the interior surface of the can body.
7. In a machine for spraying a coating material
15 on the interior surface of an irregular shaped
tubular can body, the combination of an inter
mittently rotatable support for holding a can
body stationary during a spraying operation, an
elongated rotatable spray gun having a discharge
orifice and being movable longitudinally of its
axis into the stationary can body for spraying the
interior surface thereof, an elongated valve rod
located in said gun and rotatable therewith on
ieir longitudinal axes and for controlling the
25 effective size of said orifice, a spring carried by
said valve rod for moving the same to close said
orifice, and a cam carried by said valve rod and
rotatable therewith said cam having a surface of
irregular contour for variably overcoming the ac
30 tion of said spring to alter the size of said orifice
and thus regulate the quantity of spraying mate
rial discharging therefrom, the irregular contour
of said cam surface constituting an increment of
the distance between the gun and that portion of
the interior surface of the can body being sprayed
to provide an even thickness coating for the
interior surface of the can body.
8. In a machine for spraying a coating mate
rial on the interior surface of an irregular shaped
40 can body, the combination of an intermittently
rotatable support for said can body, an elongated
5. In a machine for spraying a coating ma
spray gun having a discharge orifice for spray
terial on the interior surface of an irregular
ing the interior surface of a can body while tem
shaped tubular can body, the combination of an
porarily held stationary on said support, means
indexing turret for advancing a can body through 45 for rotating said spray gun on its longitudinal
the machine and for holding the body in a sta
axis, means connected with said rotating means
tionary Aposition during a spraying operation, a
for longitudinally reciprocating said gun into and
slide having reciprocal movement adjacent- said
out of said stationary can body during the spray
turret, a rotatable spray gun carried on said
ing operation, a valve rod carried by and operated
slide and having a discharge orifice, said gun 50 in said gun for controlling the effective size of said
being movable by said slide longitudinally of
orifice, and devices actuated by said rotating
means for longitudinally moving the valve rod to
said held can body for spraying the interior sur
alter the size of said orifice and thereby vary the
face thereof, avalve rod located in said gun for
quantity of spraying material discharging there
controlling the effective size of said oriiice, means
mounted on said slide for moving said valve rod 55 from to apply an even thickness coating to the
interior surface of the can body, said variation
to open and close said orifice, and devices carried
by said slide and having independent movement
of spraying material being dependent upon the
distance between the gun and that portion of the
thereon in accordance with the distance between
interior surface of the can body being sprayed.
the gun and that portion of the interior surface
9. In a machine for spraying a coating material
of the held can body being sprayed for further 60
on the interior surface of an irregular shaped can
moving said valve rod after the orifice has been
body, the combination of a turret for presenting
opened for altering the size of said orifice to con
can bodies for a spraying operation, a spray gun
trol the quantity of spraying niateriai discharg
having a discharge orifice, a valve rod carried by
ing therefrom to provide an even thickness coat
65 and operated in said gun for controlling the effec
ing on the interior surface of the can body.
tive size of said oriñce, means for moving said tur
6. In a machine for spraying a coating mate
ret intermittently and for holding a can body
rial on the interior surface of an irregular shaped
stationary, means for reciprocating said spray gun
tubular can body, the combination of a support
to move its discharge orifice into said stationary
for holding a can body stationary during a sprayn
ing operation, a slide having reciprocal movement 70 can for spraying, means for continuously rotat
ing said spray gun to pass said discharge orifice
adjacent said support, a sleeve carried on said
along the interior surface of the irregular shaped
slide and movable thereon, a rotatable spray gun
can body, and devices for actuating the said valve
carried on said slide and having a discharge ori
rice, said gun being movable by the slide longi 75 rod in accordance with the distance between the
gun and that portion of the interior surface of
tudinally into the held can body for spraying the
11
2,403,994
the can body being sprayed to regulate the quan
tity of spraying material discharged from said
orifice to insure an even thickness coating on the
interior surface of the can body.
l0. In a machine for spraying a coating mate
rial on the interior surface of an irregular shaped
tubular can body, the combination of an inter
mittently rotatable turret for successively pre
_12
body to be sprayed, a valve rod movable Within
said gun for controlling discharge of coating ma
terial from said orifice, a cam located adjacent
said gun and having rotation therewith, said cam
having a cam surface constituting an increment
of the shape of said can body, a sleeve movable
with and relative to said gun and enclosing said
cam, an adjustable stop for limiting said sleeve
senting can bodies for a spraying operation, a ro
movement, and means carried by said sleeve for
tatable spray gun having a discharge nozzle, said
engaging said cam surface to alter the position
gun being movable longitudinally into a station 10 of said valve rod to vary the quantity of coating
ary can body for spraying the interior surface
material discharging therefrom, whereby an even
thereof, means for intermittently rotating said
turret for temporarily holding stationary a can
thickness coating is applied to the said surface.
HORACE J. PAYN'I‘ER.
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