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Патент USA US3022021

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Feb- 20, 1962
M. HEGYI
3,022,011
COATING THICKNESS CONTROL MECHANISM
Filed Oct. 9, 1959
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United States Patent Office
1
3,022,011
COATING THICKNESS CONTRQL MECHANISM
Moses Hegyi, Orland Park, 111., assignor to Borg-Warner
Corporation, Chicago, Ill., a corporation of Illinois
Filed Oct. 9, 1959, Ser. No. 845,391
12 Claims. (Cl. 239-97)
This invention relates to automatic spray coating
equipment and particularly to vertically reciprocating
paint spraying equipment.
For coating sizable sheets of material such as steel of
the order of four to sis feet in width, for example, it is
conventional practice to use a paint spraying apparatus
which has mounted thereon a vertically reciprocating
paint spray gun. A length of this material to be coated
may be supported vertically and moved relatively to the
paint spray apparatus. Either the apparatus may be held
stationary and the material to be coated moved past the
3,622,611
Patented Feb. 20, 1962
2
Another object of this invention is to provide a vari
able speed mechanism which is responsive to the vertical
movement of the spray gun carriage to control the amount
of paint or other coating material which may be emitted
from the spraying apparatus.
‘ A still further object is to provide a mechanism where
in the travel of the spray gun carriage actuates a cam
eclianisrn for varying the speed of the carriage itself.
_ A still further object is to provide a mechanism where
10 111 the spray gun carriage actuates a cam mechanism
which in turn acts to vary the pitch of a variable speed
drive pulley so as to vary the speed of the spray gun
carriage thereby varying the amount of coating deposited
during the travel of the spray gun carriage.
These and other important objects of the invention will
be more clearly understood upon reading the following
detailed description and reference to the accompanying
drawings wherein:
apparatus or the material may be held stationary and the
FIG. 1 is a side view of a paint spraying apparatus;
apparatus moved past the material. In either event, 20
FIG. 2 is a top view of the apparatus taken along the
however, a spray gun forming part of the apparatus is
line 2r—2 of FIG. 1;
generally moved up and down to cover the total width
_ FIG. 3 is a front view of a portion of the paint spray
of the work to be sprayed. Generally, the paint spray
mg apparatus taken along the line 3—3 of FIG. 1;
gun is fed from a paint tank which may be under pressure
FIG. 4 is a detail of the adjustable cam track;
to assist in forcing the paint through the nozzles of the 25
FIG. 5 is a detail of the variable pitch pulley used for
spray gun. Such a tank is sometimes located remotely
driving the spray gun carriage.
at a distance from the paint spray apparatus itself and
Referring now to the drawings wherein like reference
may, for example, be supported from a ceiling structure.
numerals are used to indicate similar parts throughout
In any event, in addition to the pressure which may be
the various ?gures, the numeral 10 indicates generally
applied to the spray tank as pointed out above, there exists
a paint spray unit. The unit 10 comprises a frame 12,
at the nozzles of the spray gun a hydrostatic pressure
a spray gun carriage 14 carrying a spray gun 15. The
(which varies with the different position of the spray
spray gun carriage 14 is mounted for vertical reciprocat
gun), i.el, the hydrostatic pressure is lower when the spray
mg movement on the vertical guide bars 16 and 18. The
gun is at a relatively high point in its vertical path of
unit 10 also comprises a drive base 20. Suitable fluid con
travel and higher when the "spray gun is at a relatively 35 nections are made to the spray gun 15 in a conventional
low point in its path of travel. The variation in hydro
static pressure with the change in height of the spraying
manner, the ?uid being supplied through a conduit 19
connected with a uniformly pressurized paint tank (not
apparatus results in a greater or lesser volume of liquid
shown). The frame 12 comprises a base 22 on which
are mounted the vertical guide bars 16 and 18. Also
mounted on the frame 12 is a vertical member 24, the top
portion 26 thereof being used to guide a slide cam
being emitted from the spray nozzles depending on the
relative height of the spray nozzles, i.e., more paint is
emitted with a greater hydrostatic pressure and a smaller
quantity is emitted with a lesser hydrostatic pressure.
This results in a variation in thickness in the coating de
posited on the material assuming that the paint spray
gun is moved up and down at a constant speed. It has
been determined, for example, that where a sheet of ma
terial of the order of ?ve to six feet in width is to be
coated, that there may be a variation of 303-304 inches
. eclianism which will be hereinafter more fully described.
Attached to the base 22 are brackets 28 and 36 which
carry a pair of bars 32. The drive base 20 carries a pair
of brackets 34 and 36 which are adapted to be slidably
mounted on the bars 32 so that the drive base it? may
slide back and forth relative to the frame 12. It will be
appreciated that other means, such as rollers, may be
used to mount the drive base 29 on the frame 12 to per
in the thickness of the coating applied, that is, that the
coating at the bottom of the sheet will be .0O3—.004 50 mit relative motion of the drive base 20 with relation
thicker than at the top of the sheet because of the differ
ence in hydrostatic pressure on the paint spray gun at
its upper and lower positions.
Since the spray gun moves continuously with an up and
down reciprocating movement, it has been determined
that if the speed of travel of the spray gun could be
decreased as the hydrostatic pressure was decreased and
increased as the hydrostatic pressure was increased, that
a substantially even coating could be applied on the ma
to the frame 12.
A drive motor 38 is mounted on the drive base 29 and
is connected by a belt drive 4%} to the spray gun carriage
14 through ‘a speed reducer unit 42 and a chain drive
44, the chain drive being drivingly connected to the spray
gun carriage 14,. Attached to ad driven by the drive
motor 38 is a variable pitch pulley 46 having a stationary
member 48 and a movable member 56 which are mounted
on a motor drive shaft 52. The movable member 59 has
terial in spite of the different quantities of paint emitted 60 attached thereto a collar 54. A huhmember 56 is ?xedly
mounted on the drive shaft 52 by means of a key or other
due to the variation in hydrostatic pressure during the
up and down movement of the spray gun.
Accordingly, one of the objects of this invention is to
conventional arrangement so that the hub member 56 is
stationary with respect to the drive shaft 52. A com
pression spring 58 is positioned between the movable
at all stages of the varying height of the spraying 65 member 5i} and the hub member 56. The members 48
provide a mechanism which will deposit an even coating
Another object of this invention is to provide a mecha
and 59 of the variable pitch pulley 46 are formed to ac
commodate a V-belt. The speed reducer unit 42 has
nism whereby the variable speed of the spraying appara
mounted thereon a shaft 66 on which is mounted a ?xed
apparatus.
pulley 52 which is driven by the motor 38 and the pulley
tus is utilized to compensate for the diiference in hydro
static pressure at various positions of the spraying appa 70 46. The speed reducer unit 42 has an output shaft 64
which is drivingly connected to a drive sprocket 66.
ratus in its vertical path of travel.
3,022,011
3
4
decreased with a consequent decrease in the speed of the
drive sprocket and the drive chain connected thereto.
Thus it will be seen that the carriage 14 attains its slowest
rate of movement as it approaches the upward portion of
its path of travel.
As the carriage commences its downward path of travel,
the tension spring 108 will tend to return the drive
base to its original position, that is, move it to the right
Another sprocket wheel 63 is rot"tahly mounted at the
upper portion of the vertical member 2-4. The two
sprocket wheels 66 and 68 accommodate the drive chain
76. The chain drive mechanism 44 is provided with a
conventional arrangement (not shown) for forming the
driving connection between the drive chain 70 and the
spray gun carriage 14 and for permitting the spray gun
carriage to travel in the same vertical plane when it
as seen in FIG. 1, and the tension on the belt drive 40
will be decreased. This decrease in tension on the belt
reverses its direction of movement.
A cam mechanism 74 is adiustably mounted on the drive
base 20 and coacts with a cam roller mounted on the
spray gun carriage 14 as hereinafter described. The cam
drive will permit the variable pitch pulley, through the
expansion of the compression spring 58, to increase its
pitch and thus increase the speed of the speed reducer
mechanism 74 comprises a ?xed substantially vertical
unit ‘42 and consequently the speed of the spray gun
arm 76 attached to the drive base at 7 8. The cam mech
anism 74 also comprises a cam bar 80. The cam bar 15 carriage 14 as it moves to a lower position. It will be
noted that both the tension spring 108 forming a connec
tion between the drive base 20 and the vertical member
24 of the'frame 12 and the spring 58 associated with the
A bracket 84
is ?xedly attached to the cam bar 80 at 86 and is ad
justably attached to the arm 76 by means of a bolt 88
which is received by a slot 99 formed in the bracket
84. The lower portion of the cam bar 80 is adjustably
secured to the drivebase 20 by means of two bolts 92
and 94. Slots 96 and 98 are provided in the cam bar 80
a 80 has formed thereon a ‘cam surface 82.
respectively for the bolt connections 92 and 94.
variable speed pulley assist the drive base 20 in moving
to the right as shown in FIG. 1.
'
During downward movement of the spray gun carriage
14, there is sometimes a tendency for the‘ carriage to
pick up additional speed'due to gravity unless means
The
adjustable bolt connections 88, 92 and 94 permit adjust
are provided to eliminate this undesirable e?eot.
ment of the cam bar 80 to various inclined positions
relative to the plane of movement of the spray gun
insure that the movement of the carriage 14 is due solely
' a carriage 14.
To
to the chain drive, cushioning compression springs 110
may be mounted on the vertical bars 16 and 18 or on
The upper portion of the cam bar 80 has
only one of those bars. Such a spring in its expanded
form may extend, for example, half the height of the
move in the groove 102 formed in the upper portion of
the vertical member 24. Attached to the spray gun car 30 unit. Such a spring has a gradual cushioning effect on
the carriage during its downward travel and decreases
riage 14 is a bracket 104 carrying a cam roller 106 which
the effect of gravity on the carriage. This, therefore,
is adapted to coact with the cam surface 82 of the cam
helps to insure that the speed of the carriage is controlled
bar 80.
formed thereon a depending lip 100 adapted to slidably
solely by the speed of the drive chain.
A tension spring 108 is attached to the bottom portion
As previously indicated, when the spray gun moves
of the vertical‘ member. 24 and the bracket 36 which is 35
downwardly, the hydrostatic pressure progressively in
attached to the drive base 20. '
bar 16 so as to be positioned between the spray gun ‘
creases and becomes greatest when the spray gun. is at its
lowest position as shown in FIG. 1. Consequently, a
carriage 14 and the base 22.
greater emission of coating, material results because of
A compression spring 110 surrounds the vertical guide
40 this increased hydrostatic pressure. Conversely, ‘a lesser
Operation
emission of coating material occurs with a'decrease in
The operation of this device Will now be described.
hydrostatic pressure. In order to overcome this problem,
Let us assume that the cycle of operation starts with the
this device has been designed so that the speed of travel
spray gun carriage 14 and the. spray gun. 15 attached
of the spray gun'will be progressively decreased during
its upward travel and progressively increased during its
thereto being in a lower position as shownrin FIG. 1.
: When the drive motor 38 is running a drive is completed 45 downward travel to compensate for the greater emission
through the variable pitch pulley 46, the V-belt drive 40,
of ?uid and lesser emission of. ?uid due to variation in
the ?xed pulley 62, the speed’ reducer unit 42 to the. ' hydrostatic pressure while moving downwardly and up
wardly respectively. This compensation results in elimi
sprocket wheel 66. Thus the drivechain 7 i) is driven and
carries with it the spray gun carriage 14. The carriage 50 nating an undesirable variation in the thickness of the
14 is carried upwardly to the top of the unit and then
coating so that instead of having a variation of .003
back down as the endless chain is continuously driven by
.004 inches in coating thicknessbetween the top ‘and
the drive sprocket 66. During the upward. travel of the
bottom of a sheet 5-6 feet wide, the variation can be
carriage 14 the bracket 104 and the cam roller 106 are
kept within’ a tolerance of less than .001 inch.
obviously carried with it. During this upward movement 55 In summary, it can be seen that this device provides
the cam roller 106 bears against the cam surface 82. The
a very simple method for compensating for the varia
cam bar 80,'as shown in FIG. 1, is slightly inclined to the
tion in the thickness of a coating deposited by a spray
right, the proper adjustment of the bolt connections 88,
gun where variations in hydrostatic pressure vary the
92 and 94 having been made to set the desired inclina
thickness of the coating depending upon the height of
tion of the cam bar. Thus, as the cam roller 106 moves
upwardly, the drive base 20 to which the cam bar 80
is attached moves to the left as shown in FIG. 1 against
60 the spray gun.
This is advantageously.accomplished by
the use of a variable speed drive comprising, in this case,
a variable pitch pulley acting in conjunction with a
the tension exerted by the spring 108. As this drive base
cammed device actuated by the movement of the spray
26 moves to the left, a tension is put on the V-belt 40 so
gun carnage.
'
and ‘decrease ‘the pitch of the variable pitch pulley 46..
While the foregoing paragraphs and accompanying
This decreasing of the pitch takes place by the V-belt 65 drawings have disclosed a particular embodiment of the
. tightening up and slipping down between the stationary
member 48 and movable member 50 of the pulley 46.
It will be noted that'due to the inclination of the cam
invention, it is to be understood that these disclosures
are for the purpose of description only and the inven
tion shall be limited only by the scope of the appended
bar 80, thedrive base 20 will be progressively moved to 70 claims.
the left as seen in FIG. 1 as the cam roller 106 moves up
I claim:
‘
a
1. In a vertically reciprocating system including a
ward. Thus, the pitch of the pulley 46 will be constantly
decreased throughout the entire upward movement of the
coating device means. for compensating for variable hy
carriage of the cam roller 106. As the pitch of the pulley
drostatic pressure on said device, said means including
'46 is decreased the speed of the reducer unit is necessarily 75 a variable speed drive which regulates the rate of up
3,022,011
6
5
frame member, a substantially vertical track mounted
ward and downward movement of said device so that
said rate is proportional to said hydrostatic pressure.
2. In a vertically reciprocating paint spraying system,
a spraying device responsive to hydrostatic pressure,
means for controlling the thickness of paint sprayed on
an article being painted including a variable pitch pulley
drive and means actuated by said‘spraying device for
for up and down movement along said track, a chain
drive connected to said carriage, a spraying device car
ried by said carriage, a drive base movably mounted on
and is responsive to hydrostatic pressure means for con
trolling the rate of travel of said device so that the rate
of travel is directly proportional to the hydrostatic pres
for coacting with said cam track when said carriage and
spraying device are moved along said vertical track, said
on said frame member, a carriage mounted on said track
said frame, a drive motor mounted on said drive base, a
speed reducer unit driven by said motor and connected
to said chain drive for driving said chain drive, a variable
varying the pitch of said pulley drive.
pitch pulley arrangement between said drive motor and
3. ‘In a vertically reciprocating coating system a coat
ing device which moves in a substantially vertical plane 10 said speed reducer unit, an adjustable cam track mounted
on said drive base, a cam roller connected to said carriage
cam roller being effective to move said drive base and
4. The device of claim 3 wherein the means for con 15 the motor mounted thereon to vary the pitch of said
pulley and thereby change the speed ratio between the
trolling the rate of travel includes a variable pitch pulley
motor and speed reducer to cause a deceleration of the
drive.
carriage and spraying device during upward movement
5. The device of claim 3 wherein the means for con
sure on said device.
thereof and acceleration during downward movement
trolling the rate of travel includes a variable pitch pulley
drive, and means for varying the pitch of said pulley 20 thereof.
11. In a continuous spraying device adapted for spray
drive including a cam mechanism actuated by the move—
ment of said coating device.
'
6. The device of claim 3 wherein the means for con
ing paint wherein the hydrostatic pressure head of the
paint at the spraying device varies with the changing
height of the spraying device during the course of its up
trolling the rate of travel includes a variable pitch pulley
drive, means for varying the pitch of said pulley drive 25 and down movement the combination comprising: a
frame member, a substantially vertical track mounted on
including a cam mechanism actuated by the movement
said frame member, a carriage mounted on said track
of said coating device, said cam mechanism comprising
for up and down movement along said track, a spraying
an inclined bar.
device carried by said carriage, a drive base movably
7. The device of claim 6 wherein the inclined bar
of the cam mechanism is adjustable to increase or de
crease the rate of acceleration or deceleration of the coat
30 mounted on said frame, a drive motor having a drive
ing device.
shaft mounted on said drive base, a variable pitch pulley
mounted on said drive shaft, an endless chain drive for
up and down movement the combination comprising:
ment along said track to move said drive base and the
driving said carriage, a speed reducer unit driven by said
8. In a continuous spray coating device adapted for
motor by a belt drive and connected to said chain drive
spraying paint wherein the hydrostatic pressure head of
the paint at the spraying device varies with the changing 35 for driving said chain drive, a cam track mounted on said
drive base and actuated by said carriage during its move
height of the spraying device during the course of its
motor mounted thereon thereby tensioning the belt drive
so as to decrease the pitch of said variable pitch pulley
up and down on said frame, a drive base movably mounted 40 and thereby reduce the speed ratio between the motor
and speed reducer thus causing a constant deceleration
on said frame and carrying a drive motor, a speed re
of the carriage and spraying device during upward move
ducer unit mounted on said frame and drivingly con
ment thereof, and spring means connecting said frame
nected to said chain drive, a variable pitch pulley drive
and said drive base to facilitate return of the drive base
arrangement between said drive motor and said speed
reducer unit for varying the speed of. said chain drive 45 to its normal position during downward movement of said
carriage thus increasing the pitch of said variable pitch
‘and the spray gun carriage drivingly connected to said
pulley and the speed ratio between the motor and the
chain drive, and means actuated by said spray gun car
speed reducer thus causing a constant accelerated down
riage for varying the pitch of said pulley and thereby
ward movement of the carriage and spraying device.
the speed of said chain drive.
12. In a continuous spraying device adapted for spray
9. In a continuous spray coating device adapted for 50
a frame member, a spray gun carriage mounted on said
frame, an endless chain drive for moving said carriage
spraying paint wherein the hydrostatic pressure head of
the paint at the spraying device varies with the changing
height of the spraying device during the course of its up
ing paint wherein the hydrostatic pressure head of the
paint at the spraying device varies with the changing
height of the spraying device during the course of its
and down movement the combination comprising: a
frame member, a spray gun carriage mounted on said
up and down movement the combination comprising: a
frame member, a substantially vertical track mounted on
said frame member, a carriage mounted on said track for
up and down movement along said track, a spraying de
frame, an endless chain drive for moving said carriage
up and down on said frame, a drive base movably
mounted on said frame and carrying a drive motor, a
speed reducer unit mounted on said frame and drivingly
vice carried by said carriage, a drive base movably
mounted on said frame, a drive motor having a drive
connected to said chain drive, a variable pitch pulley 60 shaft mounted on said drive base, a variable pitch pulley
mounted on said drive shaft, an endless chain drive for
drive arrangement between said drive motor and said
driving said carriage, a speed reducer unit driven by said
speed reducer unit for varying the speed of said chain
motor and connected to said chain drive for driving said
drive and the spray gun carriage drivingly connected to
chain drive, an adjustable cam track mounted on said
said chain drive, and means actuated by said spray gun
carriage for varying the pitch of said pulley and thereby
the speed of said chain drive, said means including a cam
track mounted on said drive base, the movement of said
drive base being responsive to the up and down move
ment of said spray gun carriage in contact with said cam
track.
10. In a continuous spraying device adapted for spray
ing paint wherein the hydrostatic pressure head of the
paint at the spraying device varies with the changing
height of the spraying device during the course of its up
and down movement the combination comprising: a
' drive base, a cam roller connected to said carriage for
coacting with said cam track when said carriage and
spraying device are moved along said vertical track, said
cam roller being effective to move said drive base and
the motor mounted thereon in a direction away from said
70 speed reducer unit so as to decrease the pitch of said
variable pitch pulley and thereby reduce the speed ratio
between the motor and speed reducer thus causing a
deceleration of the carriage and spraying device during
upward movement thereof, ?rst spring means connecting
said frame and said drive base to facilitate return of the
3,022,011
7
drive base 'to’its normal position to thereby increase the
speed ratio; between the motor and the speed reducer
when- the carriage and. spraying device is in a downward
ment qf the'carriag‘e to be controlled entirely by the chain
path of travel to thereby e'?ect an accelerated downward
movement of the carriage and spraying device, a com
References Cited in the ?le of this patent
pression spring means connected between said carriage
and said‘ frame to cushion the downward movement of
said carriage tpjprevent coasting of the carriage during
its downward travel thus ‘allowing the downward move
drive.
UNITED STATES‘ PATENTS
2,516,173
2,840,037
2,840,038
Ballew _____________ __,_ July 25, 1950
Verba ______________ -_ June 24, 1958
Verba ________ -7. _____ __ June 24, 1958
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