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Патент USA US2406136

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Aug. '20, 1946.
J. P. CORCORAN
2,406,136
ANTIBUCKLING DEVICE FOR FILM vFEEDING MECHANISMS
Filed April 17, 1944
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INVENTOR
Jamoa P Corcoran
A'r'roRN EY
Patented Aug. 20, 1946
2,406,136
UNITED STATES PATENT OFFICE,
2,406,136
ANTIBUCKLING DEVICE 'FOR FILM
FEEDING MECHANISMS
James Patrick Corcoran, W'est Los Angeles, Calif.,
assignor to Twentieth Century-Fox Film Cor
poration, Los Angeles, Calif., a corporation of
New York
1
Application April 17, 1944, Serial No. 531,510
2, Claims. (01. 2,0Q—r-52)
2
This invention relates. to the cinetechnical art
and deals particularly with a means for pre
venting buckling in motion picture ?lm While
being run through cameras or the like.
The, invention to be described hereinafter has
recorder, with the. front door~.removed,_ showing
how my device would. be installed therein;
Figure 2 is a schematic view of an electrical
circuit which, may be used with the device as
it is shown in Figure 1;
been developed in connection with asound cam
era which is more commonly called in the art
a sound recorder, However, as the description
Figure 3 is a view of a different type of sound
recorder showing the application of two of ,my
proceeds it will become apparent to cine-tech
Figure 4 is .a schematic diagram showing the
electrical circuit which may be used in conjunc
tion with the device shown in Figure 3.
Brie?y stated,- my invention may be broadly
stated to comprise a toggle-type switch having
nicians that the means disclosed will operate
equally as well in cameras which take pictures,
or in projectors, or in. any type of apparatus
where the ?lm is moved through the machine by
mechanisms,
devices; and
'
push buttons for opening and closingthe switch,
The chief object of this invention is to provide 15 together with means for mounting the switch
a device which automatically operates to stop
in the camera along the path of-travel ofl'the
the ?lm moving mechanism in a camera when
?lm so vthat the ?lm will operate a member
ever the ?lm does not ,follow its usual .path
which actuates the switch whenever the ?lm
through the camera. In sound cameras it has
leaves its normal path of travel. In other words,
been the experienceof operators that the take 20 if the ?lm magazine take-up fails to operate,
up spool which draws the ?lm out of the camera
the ?lm necessarily will accumulate in the cam
into the magazine‘ sometimes will fail to take
era compartment and will be forced to leave its
up the ?lm sul‘?ciently fast to clear it from the
normal path of travel therein. My device is so
take-off sprocket, in the camera or will fail to
take the ?lm away altogether, thus allowing it
to accumulate in the camera. Since the operator
has no way of immediately knowing when this
occurs, it sometimes happens that the ?lm will
pile up in the camera to such an extent that
it will pack between the sprockets and rollers
and strain the bearings. At times ithas been
known to actually damage bearings, rollers, and
casings.
To prevent the above, I conceived of an ar
set and arranged that as soon as the ?lm does
leave .its accustomed path it engages a member
which in turn operates the switch, The result
that the power is shut off to the motor and
the whole machine stops immediately. In prac
tice, this has been found to substantially elimi
nate all ?lm packing in cameras.
~ Referring more speci?cally to’ the drawing,‘ it
will be seen in Figure 1 that I haveinstalled my
arrangement in a sound camera generally desig
nated l ‘I. The camera comprises a conventional
rangement whereby the ?lm, upon. leaving its
; light-tight case l2 having a ‘door which closes
regular path in the camera, would trip, a switch
which in turn would actuate attendant mecha
nism to shut olf the power to the motor which
drives the machine. The location of the switch
becomes important in view of the fact that most
of the trouble occurs at the take-off sprocket in
the camera, due to failure of the take-up spool
in the magazine. Sincethis was the point where
the ?lm was most apt to buckle, I decided to
place my device at this particular point so as to
the same but which is not shown inv this view.
Mounted upon the case I2 is a ?lm magazine
eliminate any trouble from this source.
I also
realize that ‘there are other points in the ?lm
travel that need attention. Therefore, in the
drawing. and description it will be found that I
have shown and illustrated more than one place 2‘
in which mydevice may be applied Other ob
jects and advantages will become. apparent as
thedescription proceeds in conjunction with the
generally designated '13 which feeds ?lm into and
out of the camera case l2. As shown in this 'view,
the ?lm F enters the magazine at 9 and leaves
the magazine at In and flows through the cam
era in the direction of the arrows l4 and I5. Be
tween 9 and I0 the ?lm moves in its customary‘
path over guide rollerhl?, feed sprocket I 'I,‘ where
it is clamped in position by clamping rollers 18,
and from there in its usual path over the stabiliz
ing recording drum l9. From the drum 19 the
?lm follows back to the sprocket I‘! and is clamped
on the lower side of the sprocket I‘! by clamp
rollers 20. From here it passes overguide rollers
2| and 22, from which point it passes out of’ the
case at the point l-ll. Since the feed sprocket-l1
isthe driven member of the mechanism and is
geared to the ?lm, it can readily be seen that if
drawing in which:
Figure lis a fragmentary view of a sound ‘55 the ?lm should ‘fail to ‘be removed from the maga- ;
2,406,136
3
4
zine at the point In it would accumulate around
the rollers 2| and 22. The roller 2|, being near
est to the sprocket II which feeds the ?lm, has
been used as the particular roller with which I
associate my device. As will be noted here, my
device comprises a switch generally designated S.
engages a button 35 which operates the switch
SI and extends to a position close to the face of
the wheel of the sprocket. Under this set-up it
would be impossible for ?lm to wrap around the
sprocket wheel 33 between the ?nger and the face
of the wheel without pressing the ?nger 34 and
The switch is of the toggle type with push but
actuating the switch SI, which would in turn
operate the relay switch to disconnect the motor
tons 23 and 24, which are for the purpose of
from the source of electrical supply.
putting the switch in an “on” and “off” position.
The electrical circuit for operating the two
In this case the button 23 puts the switch in an 10
switches is shown in Figure 4. Here it can be
“o?” position, while the button 24 puts it in the
reverse, or “on” position. Pivotally mounted
upon the switch S is a depending member 25
seen that the switches S and SI are in series in
the circuit embodying a battery BI and a relay
switch RI. In this case the switches SI and S2
which is shaped to ?t the circumference of the
roller 2| and hangs in a position close to the 15 being in series, the relay RI must hold contactors
36 and 31 in a closed position when the switches
roller. The purpose of this member 25 is to en
are closed. I am aware that there are other ways
gage the ?lm F if it leaves the roller 2| to any
of doing this; for instance, the relay switch RI
extent and, if the ?lm presses the member 25
could be in a closed position when deenergized, in
sufficiently so as to move it slightly, it will in
turn press the button 23 which will throw the 20 which case the switches S and Si could be par
alleled and could be actuated into a closed posi-_
switch S into an “off” position and shut off the
tion by the ?lm.
motor that drives the machine.
A device of the above nature has been found
Another way in which the switch may be actu
to eliminate all ?lm buckling due to failure of
ated would be for the ?lm F to cling to the teeth
on the sprocket wheel I‘! and ride up into the 25 magazine take-ups or any other deviation of the
path of the ?lm through cameras.
space between the member 25 and the periphery
In practice it has been found to be desirable,
of the wheel. To prevent the ?lm from riding
in view of certain precautions which have to be
past the switch and into the upper part of the
used in machines of this type, to use a push but
sprocket where it would become jammed with the
incoming ?lm, I provide a stripper plate 26 which 30 ton toggle switch. This type of switch has two
positions, an “on” and “off” position, which re
is arranged to strip the ?lm from the face of the
main ?xed until changed. Accordingly, since it
sprocket wheel and force it against the member
is possible for the switch to be in the wrong posi
25. The result is that if any ?lm ever follows
tion at times, it is necessary to provide means
the sprocket wheel up to this point, it is forced
whereby the operator could assure himself that
against the member 25 and the switch may be
the switch was in the proper position before the
actuated in this manner.
machine was started. For this purpose I provide
In Figure 2, I have shown how the switch op
an external arrangement for setting the switch
erates to shut down the motor which drives the
in the proper position for running. The means
camera. Here it can be seen that the switch S
is installed in a circuit comprising a battery B 40 for this purpose is best shown and illustrated in
Figure 1. Here it will be seen that I have
and a relay switch R. The circuit comprising the
mounted a rod 38 in the wall of the casing l2.
battery, the relay, and the switch S is grounded
The rod 38 is formed on the outer end with a
as shown at 21 and 28. However, in place of the
head 39 and carries on the inner end a member
two grounds I may use a conductor circuit if de
sired. The relay switch R operates contactors 45 4-0 which is ?xed thereto in any suitable manner.
The member 40 is provided with an arm that
29 and 3!! which constitutes a, switch placed in the
carries a button 4| arranged to engage the but
conductors between the source of electrical sup
ton 24 when the rod 38 is pushed inwardly. A
ply and a motor (not shown) which operates the
spring 42 normally keeps the rod extended ex
camera. As a precautionary measure, I may in
corporate a manually operated switch 3| which 50 ternally so that the ?lm F passes freely between
the buttons 24 and 4|. Under this arrangement
would be for the purpose of closing the circuit
the operator, before starting the machine, assures
through the .relay switch R, 50 that the motor
himself that the switch S is in the proper posi
may be disconnected by hand as well as by auto
tion by pressing the knob 39. This precaution is
matic means in the camera. The foregoing de
necessary since the switch S may inadvertently
scription deals with a single installation of my
be moved into the improper position when‘thread
device for preventing ?lm buckling at a speci?c
ing the machine. With this device the door to
point in the camera.
the recorder may be closed and the switch reset
In Figure 3, I have shown how my idea may be
at any time thereafter. In Figure 3, I have shown
embodied in a different type of sound recorder.
the same arrangement with respect to switch S
Here it will be observed that I have incorporated
but have left the switch S| open for resetting by
a switch S which is identical with the switch de
hand. In this case the switch Si is in the open‘
scribed hereinabove and have also incorporated a
so that it can be seen by eye and can be manually
second switch Si. The path of the ?lm Fl through
reset.
.
this arrangement is obvious. It passes over a
sprocket 32 in identically the same manner as it
I claim:
passed over the sprocket I‘! in Figure 1. The posi
tion of the switch S in this arrangement is also
identical with that shown in Figure 1. However, in
this view there is another feed sprocket 33 which
introduces another possibility of ?lm breaking and
1. In a power driven machine for handling
.
being wrapped around the sprocket wheel 33,
thereby causing damage at this point. To pre
motion picture ?lm or the like, a feed sprocket
for passing ?lm through said machine, a switch
for controlling the power for said machine near
said feed sprocket, and a stripper plate associated
with said feed sprocket arranged to strip ?lm
from said feed sprocket when said ?lm leaves its
vent this possibility, I mounted a second switch
SI close to the sprocket wheel 33 and ?xed a
spring ?nger 34 on the switch so that the ?nger
and force the stripped ?lm to operate said switch.
2‘. In a machine for handling motion picture
customary path with respect to saidfeed sprocket,
2,406,136
5
?lm or the like, power driven means for passing
?lm through said machine, said means including
a feed sprocket and a guide roller, a switch for
controlling said power driven means having a
movable member extending near said roller 5
adapted to be engaged by ?lm leaving the roller
to operate said switch, and a, stripper plate ar
6
ranged to strip ?lm from said feed sprocket and
force the stripped ?lm to engage said movable
member and operate said switch when the ?lm
leaves its customary path with respect to said
feed sprocket.
JAMES PATRICK CORCORAN.
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