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Патент USA US2408440

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Oct. l, 1946.
A
"
ì B, E, MlLLS
FILM CLEANING DEVICE
Filed June 1_8, 1942
2,408,438
i f
5 Sheets-Sheet 1
oct. 1, 1946.y
’ B, E, MILLS
I
FILM
Y
CLEANING DEVICE
2,408,438
_
Filed June 18, 1942
@i
5 Sheets-Sheet 2
jj
M'.
oct. 1, 1946.
B, E MILLS
ì
`
2,408,438
FILM CLEANING DEVICE
Filed June 18, 1942
’
»
_ 5 Sheets-Sheet 4
p05
001:. l, 1946.
B. E, MlLLs
v
2,408,438
FILM CLEANING DEVICE
Filed June 18; 1942>
5 sheetsfsh'eet 5
100
7711611 07'.'
2,408,438
Patented Oct. 1, 1946
UNITED STATES PATENT OFFICE
2,408,438
" FILMl CLEANING DEVICE
Bert E. Mills, -Oak Park, Ill., assigner to Mills
Novelty' Company, Chicago, Ill., a corporation
of Illinois
1'
Application June 18, 1942, Serial No. 447,605
10 Claims. (Cl. 15-100)
This invention relates to a device for cleaning
motion picture ñlm and is adapted for use as an
attachment to a motion picture projector so as
to clean the film in the course of its travel from
the ñlm coil to the projector lens. It is, however,
also adaptable for use at other points or in con
nection with other film handling apparatus, as,
for example, ñlm winding apparatus or means
for transferring the film from one reel to an
2
and wiring by which the operation of the device
is controlled; and
Fig. '7 is a continuation of Fig. 6, showing the
master relay and the starting switch, which may
be coin-controlled.
In said drawings the ñlm coil, indicated by the
reference numeral II is mounted in a film holder
I2 supported on a frame I3 of a motion picture
projector. The film from the coil is paid out
from the center by means of a pay-out roller I4,
which preferably is angularly mounted and di
The principal object of the invention is to pro
rectsV the film into a plane of travel laterally dis
vide a device whereby, a film cleaning solution
posed with respect to the film coil Il, in which
may be uniformly applied to the film through
plane it passes through theV projector, being then
the medium of ñlm wiping elements and in which
returned
exterior of the coil on which it
the control of said elements and the feeding of 15 is wound tobythe
rotation
of the coil. The film is
the cleaning solution thereto are controlled in
drawn from the inside of the coil by means of
such manner as to obtain the desired result with
a feed sprocket I5 of the projector mechanism
a minimum amount of complication and diffi
and passes around a guide roller I6, the pay
culty.
`
roller I4, a guide roller l'l, and additional
A further object of the invention is to provide 20 out
guide rollers I8, I9 and 2l to said sprocket I5.
in such a film cleaning device means for causing
The film, which is identified by the numeral 22,
the device to become inoperative when the sup
then passes through the projector lens mecha
ply of cleaning solution becomes exhausted or
nism, generally indicated by the numeral 23, and
reaches a predetermined low level inthe recep
over a sound head roller 24, a second sprocket
tacle from which it is supplied. '
, '
25 25 and rollers 26, 21 and 28 back to the coil Il.
A further object of the invention is the pro
The pay-out roller I4 is, or may be, driven by
vision of means for controlling the movement of
means of a belt 29 from a source of power (not
the elements of the film wiping device into and
shown) for thesprockets I5 and 25. The pro
out of engagement with the film in coordination
jector mechanism is not described in further
with the supply of 'cleanin'g'solution to said ele 30 detail since it is believed that other details there
ments so that such solution is supplied only when
of are'not essential to an understanding of the
other.
,
they are in operative position.
'
'
‘
present invention.
Other objects and advantages of the invention
As the film passes between the rollers IB and
will be apparent from the following description
I9 it is cleaned by the device of my invention
35
of a preferred embodiment thereof, taken in con
which includes two pivoted wiper elements 3|
nection with the accompanying drawings, in
and 32 which carry pads 33 of felt or like ab
which:
„
’
sorbent material adapted to be moved into en
Fig. 1 is a side elevational -view of a motion
gagement with opposite sides of the film when
picture projector equipped with the nlm cleaning 40 the. cleaning device is operated, as will be here
device of my invention;
inafter described.
Fig. 2 is an enlarged frontvview, partly broken
Cleaning solution is supplied to said pads from
away, showing portions of the film cleaning de
a tank 34 through pipes 35, the rate of flow being
regulated so that said solution will drip onto
vice;
Fig. 3 is a sectional and elevational. view of 45 said pads at a desired rate of flow controlled by
means of hand-operated valves 36 extending into
the supply tank for the cleaning solution and ther
couplings 31 screwed into bosses 38 on the bot
valve mechanism for controlling the flow of so
tom of the tank 34, said couplings each having
lution therefrom, being takenfsubstantially on
staggered passages 39 and 4I therein, with an
the line 3-3 in Fig. 2;
Fig. 4 is a top plan View of the mechanism 50 opening 42 communicably connecting the same,
and with the point of the valve member 36 ex
shown in Fig. 3;
tending into said opening to a variable extent
Fig. 5 is a sectional view taken substantially
depending uponV the position of adjustment of
on the section line 5-5 of Fig. 3;
the valve. (See Fig. 3'.)
Fig. 6 is a diagrammatic view of certain of
the electromagnets and other electrical devices 55 >In the bottom ofthe tank 34 there is pro
3
¿2,408,438
vided a plate 43 supported upon a spacer ring
44 to which said plate is tightly secured by
means of screws 45. Said ring 44 and plate 43
provide the side and top walls, respectively, of
the liquid level in the tank 34 falls to a predeter
mined point.
The connections between the above-described
magnets and switches and with the source ol'
power are made through suitably located terminal
blocks |03 and |04. The connections to the
a relatively small chamber 4G which communi
cates through openings 41 in the bottom of the
tank 34 with the passages 39 in the couplings 31.
source of power and to a master relay shown in
There is an opening 48 in the plate 43 into
Fig. '7 are indicated at |02.
which extends the pointed end oi' a valve member
In said Fig. 7 ï have shown a line connection
49 which is disposed vertically through the cover
im) and a master relay Hill’. The latter comprises
5| ci the tank 34 and through a guide member
a magnet |05, an armature |05 which is normally
52 formed on the top of said plate 43.
biased to open position, and a switch lill com
The upper end of said valve member 49 is com
prising a ñxed member |98 and a movable mem
nected by means of a pin '53 with a lever 54 piv‘
ber |09 which is connected to a projection lll
oted at 55 to ears 56 on the cover 5|, said lever
carried at the end of the armature |06. Thus
54 being connected by a link 51 with an arma
when the magnet |25 is energized said switch |31
ture 58 of an electromagnet 59 carried upon a
Y is closed and when it is deenergized the switch is
support 6| on a bracket 52, which is welded or
opened.>
otherwise secured to a bracket S3 on which the
For controlling said master relay |65’ a switch
tank 34 is supported, the latter bracket being in | |2 is provided, comprising a iiXed member l i3
turn supported upon a frame arm 64.
and a movable member H4, the latter being bi~
The armature 58 is pivoted at 65 to a lug 65 on
ased to closed position and normally held in open
the bracket 82 and is normally held in the raised
position by a projection H5 on the end of a piv
position shown in Fig. 3 by means of a spring Gl'
oted lever Hä which rests on a pin ll'l on a
secured at the upper end to a projection 63 on
ratchet wheel ||8 of a coin control device ol’
said armature 58, and at the other end to a lug @il
known construction. Said wheel is spring-biased
on the bracket G2.
to rotate in clockwise direction and is permitted
In the tank 34 there is provided a iloat 1| car
to move one step in such direction for each coin
ried at the end of an arm 12 which is pivoted at
deposited, such movement being controlled by an
13 to ears 14 on the top of a plate 43. A push î escapement lever ||9 connected by a link |24
rod 15 is secured to said arm 12 intermediate the
with an armature |25 of a step-up solenoid |26
ends of the latter and extends upwardly through
in circuit with a coin switch |21. Upon the iirst
the cover 5|, having at its upper end a head 16
step the pin Iíl moves downwardly a sufficient
engaging a lower spring member 11 of a switch
1S. Said member 11 and an upper member T9 y, distance to permit the lever liü and projection
H5 thereon to move far enough away from the
of said switch are mounted in vertically spaced
switch member ||4 to allow the switch H2 to
relation in a post 8| on said top member 5| of the
close. A step-back solenoid |21, controlled by
tank 34, and are connected into an electrical cir
a cut~oiï switch |28 and having an armature |22
cuit by means of wires 82 and 83 sho-wn in Figs.
carrying a pawl |23, arranged to engage the
1, 4 and 6 of the drawings.
teeth of the ratchet wheel ||8 serves to turn said
A filler cap 84 is provided on the cover 5|,
wheel back one step for each cycle of operation
through which a cleaning solution, such, for eX
in manner which will be understood by those
ample, as carbon tetrachloride, may be poured
familiar with coin devices of this general char
into said tank 34.
acter, and when the pin ||1 is restored to its
A second magnet 85 is supported at the lower 45 original position the lever | i6 and rod l i5 will be
end of the bracket 63 and beneath said magnet is
raised to the point that the switch | i2 will be
a pivoted armature 86 carrying at its outer end a
opened, thus terminating the operation oi' the
roller 81 disposed between lower extensions 8B and
machine.
89 on the arms 3| and 32. Said arms 3| and 32
are spring-biased or weighted so as to normally be
in open position with the pads 33 separated, and
said extensions BS and 89 diverge from the pivot
The closing of the switch lill, in conjunction
50 with the operation of the master relay Ifit’, causes
the roller 81 moves upwardly ‘between said ex
tensions the upper parts of the members 3| and
the magnets 59 and 85 to be energized, thereby
opening the valve i521, 49 (Fig. 3) and moving the
wiper armsI 3| and 32, and the pads
carried
thereby, into operative relation to the film 22.
Drops of cleaning solution are 'then supplied to
32 will be moved toward each other, bringing the
pads 33 into contact with the i'ilm 22.
A third magnet, identified by the numeral S2
same passes there-between. This condition con
tirrues until the master relay opens or the mag
9| on which said arms are mounted so that when
the pads 33 and the latter clean the iilm as the
net 92 is deenergized by the opening of the switch
(see Fig. 6) , is provided for controlling the ener
gization of the valve magnet 59 and cleaner mag 60 18 which is controlled by the liquid level in the
tank 34. Thereupon the magnets 59 and 55 are
net 85, said magnet 92 being mounted in a con~
deenergized, with the result that the valve 42, 49
veniently located box (not shown) on the frame
is closed by upward movement of the armature
of the projector. The circuit, including wires Q3
58 when released by the magnet 5.3 and the wip
and 94, to said magnet 92 is adapted to be mo
mentarily closed by means of a manually oper 65 ing elements are moved to inoperative `position in
consequence of downward movement ofthe roller
able switch 95. When energized, said magnet at~
81 when the armature 86 is released by the mag
tracts an armature G5 which is connected to mov
net G5.
able members 91 and 90 of switches 99 and lill,
When the tank is refilled to the point that the
respectively, both of which are closed by move
switch 18 is closed and when the master relay is
70
ment of said armature toward the magnet. The
again energized, the wiping device can again be
switch 99, being in parallel with the switch S5
rendered operative by momentary operation of
causes the magnet 92 to remain energized after
the switch 95 and the cycle `of operation will then
momentary operation of the switch '95 until the
be repeated.
circuit is broken by opening of the switch 18 when 75 The foregoing detailed description has been
.amarres
`5
therefrom, but the appended claims should be
netic means for controlling the movement of
construed as broadly as permissible in view of
the prior art.
I claim:
6
ments engageable with the iilm in a course oi'
travel of the latter, means for'supplying a clean~
ing solution to said Wiper elements, electro-mag
given 'for olearness of understanding only, and
no'unnecessary»limitations should be understood
said wiperelements into and out of operative
CF1 position, electromagnetic means for controlling
1. A film cleaning device comprising movably
mounted wiper elements disposed, respectively,
on oppo-site sides of the iilm, electrically~controlled actuating mechanism for moving said Wi 10
per -elements into contact with the film in a
course of travel of the latter, said Wiper elements
the supply of said cleaning solution to said wiper
elements, and means for controlling both said
electromagnetic means to cause the same to be
energized and deenergized simultaneously, where
by cleaning solution is supplied to said Wiper ele
ments only when the latter are in nlm-engaging
position.
being equipped with absorbent contact pads, a
supply tank for cleaning solution, an outlet valve
6. A film cleaning device comprising wiper ele
for said tank, electromagnetic means for con 15 ments engageable with the nlm in a course of
travel of the latter, means for supplying a clean~
trolling the operation of said valve, means under
ing solution to said Wiper elements, electromag
the control of an operator for causing energiza
netic means for controlling the movement of said
tion of said electromagnetic means to open said
wiper elements into and out oi operative position,
valve, means coordinated with said wiper-actu
ating mechanism for supplying the cleaning so 20 electromagnetic means for controlling the sup
ply of said cleaning solution to said Wiper ele
lution from said tank to said absorbent pads with
ments, and means, including a control magnet,
a regulated rate of flow only When said Wiper
for causing simultaneous energization oi both
elements are in operative position, and means
said electromagnetic means at the beginning of
controlled by the volume of the solution in said
a period of operation to move said wiper ele
tank for causing deenergization of said electro
ments into contact with the ñlm and to cause
magnetic means and closing of said valve when
feeding of said cleaning solution to said elements,
the quantity of cleaning solution in the tank
deenerglzation of said control magnet causing
drops to a predetermined point.
simultaneous deenergization of both said electro»
2. A film cleaning device comprising Wiper ele
magnetic means to cause movement of said wiper
ments movable into contact with the nlm in a 30
elements out of film-engaging position and to cut
course of travel of the latter and equipped with
oil the flow ci cleaning solution thereto.
absorbent contact pads, a supply tank for clean
'7. A ñlm cleaning device comprising Wiper ele
ing solution, an outlet valve for said tank, elec
ments engageable with the iilm in a course of
tromagnetic means for controlling the operation
travel of the latter, means for supplying a clean
of said valve, means under the control of an
ing solution to said wiper elements, electromag~
operator for causing energization of said elec
ietic means for controlling the movement of said
tromagnetic means to open said valve, means for
conducting the cleaning solution from said tank
to said absorbent pads with a regulated rate of
flow, and means arranged to be automatically 40
operated after predetermined operation oi the
device to cause deenergization of said electroH
magnetic means and closing of said valve.
Wiper elements into and out of operative posi
tion, electromagnetic means for controlling the
supply of said cleaning solution to said wiper
elements, means, including a control magnet, for
ycausing simultaneous energization of both said
electromagnetic means at the beginning of a
period of operation to move said wiper elements
3. A film cleaning device comprising Wiper ele
ments movable into contact with the film in a 45 into contact with the nlm and to cause feeding
course of travel of the latter and equipped with
absorbent contact pads, a supply tank for clean
ing solution, `an outlet valve for said tank, elec
tromagnetic means for controlling the operation
of said valve, means under lthe control of an 50
operator for causing energization of said elec
tromagnetic means to open said valve, means
of said cleaning solution to said elements, deen
ergization of said control magnet causing simul
taneous deenergization of both said eiectromag
netic means to cause movement of said Wiper
elements out of nlm-engaging position and to
cut off the íiow of cleaning solution thereto, said
means for supplying cleaning solution including
a supply tank, and means controlled by the vol
for conducting the cleaning solution from saidv
urne of cleaning solution in said tank for caus~
tank to said absorbent pads with a regulated
rate of flow, and means arranged to be auto 55 ing deenergization of said control magnet When
said Volume falls to a predetermined point.
matically operated after predetermined operation
VA film cleaning device comprising Wiper ele
of the device to cause deenergization of said
ments
engageable with the iilm in a course of
electromagnet means and closing of said valve
travel thereof, means for supplying cleaning so~
and to cause said movable Wiper elements to move
out of nlm-engaging position.
60 lution to said Wiper elements, and electrically
operated control devices for moving the wiper
4. A iilm cleaning device comprising Wiper ele
elements into and out of engagement with the
ments movable into contact with the ñlm in a
iilm and for causing the feeding of cleaning so
course of travel of the latter, a supply tank for
cleaning solution, an outlet valve for said tank,
lution to said wiper elements only when they are
electromagnetic means for controlling the opera 65 in film-engaging position.
tion of said valve, means under the control of
9. In a motion picture projector, a film clean
an operator for causing energization of said elec
ing device comprising Wiper elements engage
tromagnetic means to open said valve, means for
able with the ñlm in the course of travel thereof
conducting the cleaning solution from said tank
from the film coil to the projector lens, a supply
to said wiper elements with a regulated rate of 70
tank from which cleaning solution may be sup
flow, and means arranged to be automatically
operated after predetermined operation of the
device to cause deenergization of said electro
magnetic means and closing of said valve.
5. A iilm cleaning device comprising Wiper ele
plied to said Wiper elements, an outlet valve in
said tank, and electrically-operated means for
controlling operation of said nlm Wiper elements
75 and said outlet valve, whereby the valve is opened
2,408,438
substantieily simultaneously with movement of
said-Wiper elements into nlm-engaging position.
10. In a. motion picture projector, a, ñlm clean
ing device comprising Wipers movable into and
8
able, electrically-controlled mechanism responsive
to actuation of said starting element for moving
said wipers into nlm-engaging position and, after
a. predetermined film-cleaning operation, caus
out of engagement with the ñlm in the course 5 ing disengagement thereof from the film.
of travel thereof, control means including a man
ually operable starting element and power~oper-
BERT E. MILLS.
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