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Патент USA US3089503

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May 14, 1963
R. B. WAY ETAL
3,089,499
MASK WASHER
Filed Sept. 29, 1960
3 Sheets-Sheet 1
FIG.)
A33
33
INVENTOR-S~
RoasRT B, WA)’
BY
CARL
D I 195K557
ATTORNEY
May 14, 1963
R. B._WAY ETAL
3,089,499
MASK WASHER
Filed Sept. 29, 1960
3 Sheets-Sheet 2
45"
l
I
35 58 4,3
42¢
.
BY
U
INVEN TORS
Foes/er 5. WAY
(‘l/"1L, D’ HERSE)’
ATTORNEY
May 14, “1963
R. B. WAY ETAL
3,089,499v
MASK WASHER
Filed Sept. 29, 1960
5 Sheets-Sheet 3
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assesses
Patented May 14, 1963
2
3,089,499
FIG. 3 is a cross sectional view taken on line 3-3 of
MASK WASHER
Robert B. Way, 1503 Chelsea Ave, and Carl D. Hersey,
3107 Marvin Ave., both of Erie, Pa.
Filed Sept. 29, 1960, Ser. No. 59,279 >
FIG. 4;
.
FIG. 4 is a schematic pneumatic circuit of the machine;
FIG. 5 is an enlarged view of the clamp for the mask;
and
7 Claims. (Cl. 134-441)
FIG. 6 is a view of another embodiment of the inven
This invention relates to painting machines and, more
tion.
Now with more speci?c reference to the drawings, FIGS.
particularly, to machines for washing masks.
1
to
4 show a mask washer 10‘ generally made up of a
In removing the excess paint from masks and stencils 10
tank, a mask holder, an air motor -12 to rotate the mask
used in spray painting operations, it is important to pro
holder, and a pneumatic arrangement shown in the cir
cuit to control the motor 12.
The mask holder is oscillated by a gear reducer 11
driven by the air motor 12. The air motor 12 is supplied
been produced previously.
15 with air from a ?lter 13 which supplies air through a
The machine disclosed herein moves the masks through
check valve 14 and a lubricator 15. Each of the valves
the solvent solution at a relatively high Velocity. The
shown are provided with mu?lers 16 for reducing the
movement or rotation of the mask is reversed periodically
noise of the air therefrom.
vide a machine which will thoroughly remove the excess
paint in a minimum of time. Mask washing machines
which will accomplish this purpose successfully have not
which causes an even greater relative velocity of ?uid
The pneumatic circuit is made up of valves 17, 19, 20,
to wash and a greater ?ow of ?uid over the mask and 20
22,
23, 28 and 52. The valves ‘17, 1'9, and 28 are pilot
agitation of the ?uid during the period of reversal. This
results in additional mask cleaning. Since the masks are
moved out of the ?uid ‘at the end of each cycle, the sol
vent will drain oif of the masks and the masks can be
loaded and unloaded above the liquid level. The location
of the parts of the machine makes them readily accessible
for service, repair, and operation since the masks stop in
a horizontal position. The toggle clamps disclosed make
it possible to load and unload the mask washer rapidly.
The screen at the bottom of the tank allows the sludge‘
to separate from the solvent and protects the sludge from
subsequent agitation and resultant contamination of the
solvent. The air circuit which operates the machine
renders the machine explosion proof.
The structure of the machine makes it possible to make
the tank and mask support long enough to accommodate
extremely long mask-s.
The method disclosed works
equally well with either large or small tanks since the
mask is moved, not the ?uid. Therefore, the mechanical
problems of moving large quantities of ?uid are elimi
nated.
The machine uses no pumps, nozzles, or similar
circulating devices ordinarily used. Therefore, the ma
chine avoids the inherent di?iculties usually encountered
operated valves which control the ?ow of air to the
motor 12. The cam operated valves 22 and 52 have
mechanically operated pilots thereon which are operated
by a cam 25. The cam 25 is driven by the motor 12.
The timer valve 20 has a throttling valve 27 controlling
its pilot ori?ce. The throttling valve 27 is connected
from the valve to the atmosphere to allow air to escape
from a bleed valve controlled by a knob 21 to determine
the rate at which the air bleeds out of the pilot through
the restricted ori?ce.
The motor 12 ‘drives the gear reducer 11 through a
shaft 47 which is connected by a ?exible coupling 26 to
a shaft 48. Air is supplied to start the motor 12 by the
hand operated valve 23 which supplies air to the timer
valve 20 through a line 63 and a cut-out valve 24.
The tank is supported on legs 33 which extend upwardly
‘to form a right tank end 41 and a left tank end 42. The
tank has sides 52' and 53 which extend down and con
verge downwardly and inwardly to form bottom sections
54 and 55. The sides 52’ and 53 and the bottom sections
54- and 55 are welded to the ends 41 and 42 to form a
sealed tank. The sides 52’ and 53 curve upwardly and
over at the top to form smooth contoured corners 56 and
with such compoents.
opening 50 is formed at the top for the lid and
The embodiment of the invention shown in FIG. 6 45 is57.alsoAnprovided
for inserting and removing masks. The
utilizes a simple harmonic motion to slow the movement
lower ends of the legs terminate in feet 49 which may rest
of the mask down at the end of each stroke to prevent
on a ?oor or other supporting surface.
excessive splashing of liquid.
A mask holder 39 is preferably made of a structural
It is, accordingly, an object of the present invention to
member T-shaped in cross section and it is welded at its
provide an improved mask washing machine.
Another object of the invention is to provide a mask
cleaning machine in which the mask is moved relative to
the ?uid in the machine.
A further object of the invention is to provide a mask
washing and cleaning machine which is simple in construc
50 ends to a stub shaft 30 at one end and to a hub plate
31 ‘at the other end. It will be noted that the mask
holder 39 is supported eccentrically from the axes of rota
tion of shafts 30 and 58 so that when they rotate, the
mask support swings through an arcuate path de?ned
by the hub plates 31. The shaft 30‘ is welded to a
cross bar or ?ange 59 of the T-shaped mask support
tion, economical to manufacture, and simple and ei?cient
in operation.
at one end thereof.
With the above and other objects in view, the present
The stub shaft 30 is supported in a bearing 29 which
invention consists of the combination and arrangement
may be a non-friction bearing and is supported to the
of parts hereinafter more fully described, illustrated in 0 end of the tank by means of bolts 45. The bolts 45 ex
the accompanying drawings and more particularly pointed
tend through a plate 36 and a sealing gasket 37 to form
out in the appended claims, it being understood that
a seal over the holes which receive the bolts 45. A seal
changes may be made in the form, size, proportions, and
38 prevents leak-age through the ‘bore which receives the
shaft
30.
minor details of construction without departing from the
spirit or sacri?cing any of the advantages of the inven 65
The shaft 58 extends through a bore in the other end
tion.
of the tank and the bore is sealed against leakage by a
In the drawings:
seal 35. The shaft 58 extends outwardly and is con
FIG. 1 is an end view of a machine according to the
nected to the driving mechanism of the gear reducer 11
whereby the shaft is driven.
invention;
70
The gear reducer 11 is supported on the end of the
FIG. 2 is a side view of the machine having a part of
tank by means of bolts 43 to hold the gear reducer 11
one side thereof broken away to show the internal parts;
in place and the shaft 58 is gripped by a hub 32 which
3
is bolted to the hub plate 31. The bottom of the tank
has a strainer 34 which is in the form of a perforated
sheet of steel welded to the ends so that paint can settle
from the solvent after the paint is removed from the
masks. Paint will settle below the strainer 34 and,
therefore, not be agitated by the rotation of the mask
holder 39.
4
The reversing action continues until the timer valve 20
times out ‘and .closes. This takes place when the initial
charge of air from the cut-out valve 24 to the timer
pilot cylinder 80 bleeds out of the throttling valve 27,
allowing a spring 20A to close the valve 20. Closing
the valve 20 exhausts the line 64 to the pilot cylinder
of the valve 28, allowing the spring to close the valve
28. Closing the valve 28 also exhausts the line 65 to
The cam 25 has a stop member 82 which moves with
the pilot cylinder '81 of the valve 17. The next time
the cam and engages a stop bar 48 on the ?xed end of
that the valve 52 is opened by the cam 25, air ?owing
the tank to prevent rotation of the cam beyond its in 10 from the line 73 through the restrictor 75 to the pilot
tended range of rotation in case of malfunction of any
cylinder 76 will close the valve 17, shutting off the air
of the operating valves.
supply to the valve 19 and the air motor 12, thus stopping
In operation, a supply of compressed air is connected
the washing action.
to the machine through a line 68 and it passes through
The cam 25 is connected to the gear reducer shaft
the ?lter 13. Main air from the ?lter 13 passes into a 15 58 in such a position that the masks held on the mask
line 62 to the hand actuated starting valve 23 which is
holder will vbe held up out of the washing solution when
normally closed. Air further passes through the check
the washing cycle ends and the machine stops. Stopping
valve 14 and the lubricator 15 into ‘a line 61 which leads
the masks in this position facilitates loading and unload
to the valves 17, 28, 20, and 22, all of which are closed
ing and permits the mask to drain and dry after it has
20
when the machine is at rest. The check valve 14 is
been washed. The cam may be designed so that the
inserted in the line to prevent oiled air from being forced
masks are lifted out of the solution at the end of each
back into the ?lter 13 when the machine is shut down.
The washing cycle is started by pressing a pilot mem
ber 23’ of the starting valve 23. This action will open
the valve 23, connecting the line 62 to the line 63, allow
ing air to pass through the cut-out valve 24 to a timer
pilot cylinder 80 of the timer valve 20. The cut-out
valve 24 is constructed so that it closes after passing a
?xed amount of air, thus ensuring that an equal charge
cycle. Therefore, the mask re-entering the solution will
cause considerably more agitation of the ?uid.
The clamp for attaching the mask to the mask holder
39 is shown in FIG. 5. A mask 86 is attached to a plate
87 in a well known manner such as by means of solder
ing or brazing. One side edge is disposed on the cross
bar 59 and lugs 83 are urged against the upper surface
of air passes to the timer pilot cylinder 88 each time 30 by toggle clamps 89. The toggle clamps 89 are pivoted
at 91 to a bracket 90 which is in turn ?xed to the cross
the starting valve 23 is actuated. This charge of air to
bar 59. Handles 92 are swingably connected to the
the timer pilot cylinder 81} causes the timer valve 20 to
bracket 90. A surface between the legs of the handles
open, connecting the line 61 with a line 64.
92 overlies the toggle clamps 89 and urges them down
Air in the line 64 opens the pilot opening valve 28.
The opening valve 28 connects the line 61 with a line 35 wardly when the handles 92 are in the position shown.
This forces the lugs 88 down to clamp the plate 87 to
65, passing air to a pilot cylinder 81 of the valve 17
the bar 59. To release the plate 87, the handles 92 are
which causes the valve 17 to open, then connecting line
swung rearwardly and they move from over the toggle
61 with a line 66. The air from the line 66 passes
clamps 89, allowing the toggle clamps 89 to swing up
through the valve 19 into a line 67 to the air motor 12.
Passing air to the left port of the air motor will cause 40 wardly.
it to rotate ‘and, through its shaft 47, the ?exible coupling
26, and the gear reducer input shaft 48, rotate the gear
reducer output shaft 58 in a clockwise direction. The
shaft 58 is attached to the cam 25 and the mask holder
39 and, therefore, the mask holder 39 carries the mask
attached to it through the solution and it also moves the
cam 25. The clockwise rotation will continue until a
cam lobe 68 contacts a cam roller 69 of the valve 22,
opening the valve 22. Opening the valve 22 connects
the line 61 with a line 70, passing air to a pilot cylin
der 71 of the four-way valve 19, shifting the valve 19
In FIG. 6, another embodiment of the invention is
shown. A machine 110 is similar to the machine shown
in the other embodiment of the invention and it has a
mask holder 139 thereon. The mask holder 139 is
attached to a shaft 138 similar to the shaft 30 in FIG.
2 and the opposite end of the mask holder is attached
to a shaft 158. A gear 131 is ?xed to the shaft 158
and rotates therewith. The gear 131 has external teeth
which mesh with the teeth on a rack 148. The rack 148
is held in engagement with the gear 131 by a roller 149.
The roller 149 is rotatably mounted on an end 142 of
the mask washer. The end of the rack 148 opposite the
toothed end is pivotally attached at 143 to a wheel 144
and thus connecting a line 67 to the exhaust port and
connecting the line 66 with a line 72.
on the shaft of a motor 145.
Air also ?ows from the line 72 to the valve 52 which
The motor 145 may be driven by electricity or it could
is in a closed position at this time. Connecting the line 55
be an air motor or any other suitable prime mover and
66 with the line 72 allows air to pass to the right hand
since the point 143 is offset from a shaft 146 of the
port of the air motor 12, reversing the direction of the
motor 145, as the motor rotates, the rack 148 oscillates
rotation of the motor and causing the cam 25 and the
and causes the gear 131 to rotate ?rst in one direction
mask holder 39 to rotate in a counterclockwise direction.
This counterclockwise rotation will continue until the cam 60 and then in the other. The motor 145 gives the rack
148 a sinusoidal velocity. Therefore, the mask holder .
lobe contacts a cam roller 77 of the valve 52, opening
the valve. Opening the valve 52 connects the line 72
139 will bring the mask attached thereto to a stop when
with a line 73, allowing air to pass to a pilot cylinder
the mask rises out of the liquid in the tank and will
74 of the valve 19, shifting the spool of the valve and,
return the mask to the liquid at a low velocity but will
also, through a restrictor '75 to a pilot cylinder 76 of 65 move it through the liquid at an increasingly high velocity
the valve 17.
to emerge at a low velocity. Therefore, since the masks
Because full air pressure from the line 65 is acting
move slowly as they leave the liquid and as they return
against the pilot cylinder 81 of the valve 17, the re
to the liquid, the liquid will not be splashed, yet the ‘
duced air pressure ?owing through the restrictor 75 to
velocity of movement of liquid over the mask will be
the pilot cylinder 76 cannot move the spool of the valve 70
rapid as the mask is moved through it.
17 which, therefore, remains open. Shifting the spool
of the valve 19 exhausts the line 72 and connects the
line 66 with the line 67, directing air to the left port
of the air motor 12 and reversing the motion of the cam
25 and the mask holder 39.
The foregoing speci?cation sets forth the invention in
its preferred practical forms but the structure shown is
capable of modi?cation within a range of equivalents
without departing from the invention which is to be
5
3,089,499
understood is broadly novel as is commensurate with
the appended claims.
The embodiments of the invention in which an exclu
sive property or privilege is claimed are defined as
follows:
1. A mask washer comprising a tank having an open
top and adapted to contain solvent, a mask support in
said tank supported to rotate around a horizontal axis,
means to attach a mask to said mask support in spaced
relation to the axis of rotation thereof, a motor, means
connecting said motor to a shaft to drive said shaft, a
?uid circuit to conduct driving ?uid to said motor, a
cam attached to said mask support, spaced valves sup
ported on said mask washer, followers on said valves
engaging said cam, each said follower being actuated by
said cam when said cam is rotated to a predetermined
position actuating said spaced valves, means actuated by
said spaced valves to reverse said motor whereby said
mask support is driven ?rst in one direction and then in
the other, moving said mask support into said solvent
and out of said solvent, stopping it out of said solvent
6
valves, means actuated by said spaced valves to reverse
said motor whereby said mask support is driven ?rst in
one direction and then in the other, and a timer valve
controlling the time during which ?uid is connected to
said motor, and means to actuate said timer valve, mov
ing said mask support into said solvent and out of said
solvent, stopping it out of said solvent and then moving
it into said solvent.
5. The machine recited in claim 4 wherein said means
actuating said valves to reverse said motor comprises
a ?rst, a second, and a third valve, said timer valve
actuating said ?rst valve to connect ?uid to actuating
means on said second valve, said second ‘valve, when
actuated by said timer valve, connecting ?uid to said
third valve, said third valve selectively connecting said
?uid to said motor to drive it in said ?rst and then said
second direction, said spaced valves being connected to
said second and third valves whereby said second and
third valves are actuated.
6. The machine recited in claim 5 wherein said second
and third valves are pilot controlled valves, one said
and then moving it into said solvent, a timer valve con
spaced valve actuating one pilot control on said second
trolling the time during which ?uid is connected to said
and said third valve when said one spaced valve is held
motor, and means to actuate said timer valve.
open by said cam, the other said spaced valve, when
2. The mask washer recited in claim 1 wherein said 25 actuated by said cam, actuating the other pilot on said
means actuating said valves to reverse said motor com
third valve.
prises a ?rst valve, a second valve, and a third valve,
7. A mask washer and a driving mechanism therefor
said timer valve actuating said ?rst valve to connect
comprising a tank adapted to contain solvent a rotatable
?uid to actuating means on said second valve, said sec
means for attaching a mask, a cam on said rotatable
ond valve, when actuated by said timer valve, connect 30 means, a motor driving said rotatable means, pilot means
ing ?uid to said third valve, said third valve selectively
engaging said cam, a reversing valve connecting a source
connecting said ?uid to said motor to drive it in said
of driving ?uid to said motor, said reversing valve being
?rst and then said second direction, said spaced valves
reversible to reverse the ?ow of said ?uid to said motor
being connected to said second and third valves whereby
to reverse said motor, pilot means on said reversing
said second and third valves are actuated.
valve for reversing it, and valve means actuated by said
3. The mask washer recited in claim ,2 wherein said
pilot means on said cam and actuating said pilot means
second and third valves are pilot controlled valves, one
on said reversing valve, moving said rotatable means
said spaced valve actuating one pilot control on said
into said solvent and out of said solvent, stopping it
second valve and said third valve when said one spaced
out of said solvent and then moving it into said solvent.
valve is held open by said cam, the other said spaced 40
valve, when actuated by said cam, actuating the other
References Cited in the ?le of this patent
pilot on said third valve.
4. A machine for processing masks comprising a tank
adapted to contain solvent, a mask support in said tank,
a motor driving said mask support, a control for said
motor, said control comprising a ?uid circuit to conduct
driving ?uid to said motor, a cam attached to said mask
support, spaced valves supported on said machine, fol
lowers on said valves engaging said cam, each said fol
lower being actuated by said cam when said cam is 50
rotated to a predetermined position actuating said spaced
UNITED STATES PATENTS
261,548
581,685
740,793
1,382,117
1,511,648
reen _______________ __ July 25,
Becht ________________ __ May 4,
Barrick _______________ __ Oct. 6,
Opocensky ___________ __ June 21,
Wennerblad __________ __ Oct. 14,
1882
1897
1903
1921
1924
2,074,599
2,519,259
2,989,061
Todd _______________ __ Mar. 23, 1937
Liebman ____________ __ Aug. 15, 1950
Winkler _____________ __ June 20, 1961
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