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Патент USA US2107623

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Feb. 8, 1938.
J. A. BALL
2,107,623
MOTION PICTURE CAMERA DRIVE
Original Filed Aug. 20, 1931
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Feb. 8, 1938.
J_ A_ BALL
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MOTION PICTURE CAMERA DRIVE
Original Filed Aug. 20, 1931
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2,107,623
MOTION PICTURE CAMERA DRIVE
Original Filed Aug. 20, 193]
a sheets-sheet s
M1
2,107,623
Patented Feb. 8, 1938
UNITED STATES PATENT OFFICE‘
' 2,107,623
MOTION PICTURE CAMERA DRIVE
Joseph A. Ball, Los Angeles, Calif., assignor to
Technicolor Motion Picture Corporation, Holly
wood, Calif., a corporation of Maine
'
Original application August 20, 1931, Serial No.
558,193. Divided and application April 21,
1933, Serial No. 667,222. Divided and this ap
plication January 22, 1936, Serial No. 60,233
5 Claims. (Cl. 88-164)
The herein disclosed embodiment of the pres
The present invention relates to cameras for
simultaneous exposure of a plurality of ?lms, ent invention is incorporated in a camera the
especially for the purpose of photography in design of which is completely‘described in co
natural colors, and more particularly to ?lm' pending application Serial No. 559,193, ?led
5
con?ning and advancing devices peculiarly
adapted for cameras of this type, this being a
division of the copending application Serial No.
667,222, filed April 21, 1933 now Patent No.
2,059,199.
10
Objects of the invention are to provide a mo
tion picture camera which handles conveniently
and exactly a plurality of ?lms, some or all of
which may be superposed at the ?lm aperture
or apertures of the camera; to provide an ar
15 r'angement for feeding a plurality of ?lms from
supply reels through a camera of this nature
‘and for again winding them on conveniently
arranged take-up reels; to provide an arrange
ment for such a. camera which permits easy
threading of a plurality of ?lms and assures
20 steady
progress of the ?lms through the camera
along short and uncomplicated paths. Further
objects are to .provide a smooth and equalized
drive for the ?lm movements which also permits
25 adjustment of the movements without affecting
the drive, an improved gear arrangement for
driving the various moving parts of the camera,
and generally-to provide a camera for taking
motion pictures in natural colors which can be
30 easily and conveniently operated and which per—
mits e?icient commercial production of motion
picture ?lms under. conditions similar to those
required for the taking of ordinary motion pic
ture negatives. Additional objects of my inven
tion will be apparent from the following descrip
tion of a typical concrete embodiment illus
trated by drawings, in which:
Fig. 1 is a top plan of a motion picture camera
incorporating the present invention, with the
40 cover removed and parts broken away;
Fig. 2 is a longitudinal cross-section on line
August 20, 1931, of which the above-mentioned
copending application Serial No. 667,222 is a di
vision now Patent No. 2,072,091.
This camera
is adapted for taking photographs in natural
colors according to the methods disclosed and
claimed in my Patents No. 1,889,030, of Novem 10
ber 29, 1932, and No. 2,000,058 of May '7, 1935.
This camera comprises a lens system L (Fig. 8)
and a prism P with a partially re?ecting mirror
M and two apertures in planes perpendicular to
each other for exposing ?lm G and superposed 15
?lms B and R, respectively. The various mecha
nisms ofthe camera are mounted within a sturdy
housing in such a manner that the parts which
require accurate positioning with respect to each
other are combined in separate units which are
structurally capable of maintaining the accuracy 20
of position independently of other units and
which are separately accessible and adjustable,
whereas parts which do not require particular
accuracy of assembly and operation are dis
tributed in other units.
25
Referring especially to Figs. 1, 2 and 3, the
housing I, which is made, of ribbed metal parts
(preferably of light weight alloy), is built upon
a base 2 comprising a plate 3 and a gear box 6.
The gear box 6 has receptacles ‘l for the con 30
necting plug of a ?exible shaft or other source
of power for driving the various movements of
the camera.
The base plate and gear box are
screwed together, threaded bosses 25 being pro
vided for this purpose within the gear box cast
35
ing. Inside-the gear box is mounted a power
distributing device with various gears and a
?ywheel which will later be described in detail;
and on topof the gear box is mounted the cen
tral supporting block 5| for the light splitting
system and the ?lm movements, and the sprocket
drive shaft housing I33 (Fig. 2), both also to be
40
2--2 of Fig. l with thesupporting block ‘partly
broken away;
described later. Mounted upon the gear box 6
Fig. 3 is a section on line 3'—3 of Fig. 2;
Fig. 4 is a detail of Fig. 1, with the gear hous- I is a rear wall l6 which also covers a part of each 45
of the longer sides of the camera as shown in
ing removed and with parts shown in section;
Figs. 5, 6 and '7, respectively, are diagrammatic Fig. l. The rear wall 16 has a cylindrical bulge
H for the sprocket roller mechanism, brackets
showings of the manner of threading the films;
l8 and I46 (Fig. 2) and a hollow extension I45
_ Fig. 8 is a diagrammatic plan 01' the prism
(Fig. l) for supporting the sprocket roller mech 50
v
50 system; and
Fig. 9 is a vertical longitudinal section showing anism. The front wall 2! forms a housing 22 for
the sprocket drive; and
*
the shutter shaft and another housing 23 (Fig.
2 ‘
Fig. 10 is a side elevation of the central sup
portingblock with ?lm movement, as seen from
55 .the top of Fig. 1.
_
.
2) for the shutter drive-shaft.
The block 5| (Figs. 1 and 2), which supports
the, light-dividing prism system and the two ?lm 55
2
2,107,638
movements of the camera, is screwed directly to
gear box 8.
The block 5| has a main cross
section in the shape of an L, and the housing
I34 for the drive shaft 2I8 is provided in the
angle of this L-shaped support (Figs. 1, 2 and 4).
The block 5| has also a prism bracket 55 (Fig.
l). The mutually perpendicular machined faces
of ?anges 53 and 54 and of bracket 55 correspond
to the faces of the prism unit. The ?anges 53
18 and 54 have vertical key ways 56 and 51 in their
faces for positioning and adjusting the ?lm
movements, and also openings 58 and 58 (Fig. 4)
for the bearings 248 and‘ 248 of the ?lm move
ment drive shafts hereinafter described. The
15 ?lm movements driven through gear wheels 212
and 218 (Fig. 4) are of any conventional design,
for example of the type shown in Fig. 18. In
that figure, 88 are registering pins mounted on
a yoke 61 and a rod 88 with fork 88.
The reg
istering pins are reciprocated perpendicularly to
the aperture plane by means of cam ‘H which is
eccentrically mounted on gear 12. The move
ment further comprises feeding pins 13 driven
by cam 14 of gear 15 which meshes with gear 12.
Each movement has an aperture plate 8i and
82 (Fig. 4) respectively, and corresponding back
plates 64 (Fig. 10) between which the films are
guided. The back plates are integral with aper~
ture ?anges 8i and 82 (Figs. 4 and 10) with
which they form angular pieces, the ?anges being
slidably fastened to the block ?anges 53 and 54.
It will be evident that the aperture plates 8| and
82 form angles of 90° with each other and the
bracket face, and that the optical axes of the
I light dividing prism P, mounted on bracket 8|,
will be substantially perpendicular to the respec
tive aperture plates.
Referring especially to Figs. 1 to 7, bracket I8
on rear wall I8 of the camera. housing, supports
a sprocket gear housing I3I. This housing en
closes the spiral gear I32 which is mounted on
shaft 2I8 ascending from the power distribution
gear and protected at its lower part by shaft’
housing I33 (Fig. 2) screwed to gear box 6.
45 Housing I3I also supports sprocket shaft I35
(Fig. 2) by means of suitable bearings. Within
the housing I 3I a gear wheel 138 which meshes
with spiral gear I32, is fixed to shaft I35. Keyed
to shaft I35 are three sprockets I4I, I42 and
I43. Housing I3I and the rear wallv I8 support,
with bracket I48, a tube I41 upon which a num
ber of scissor units, corresponding to the number
of ?lm sprockets used, are rotatably mounted,
units I5I, I52, I53, Ill, and I" being shown
and '1).
The segments I88 (Fig. 9) ?t with their cir
cular fronts into the bulge I1 of rear wall I8 of
the camera, and each segment has two perfora
tions I 88, I88 which are adapted to receive pins
I88 of six control knobs I8I, I82, I83, I84, I85
and I88, one for each segment. Holes I88 corre
spond to the open or ?lm releasing position of
the roller arms, and perforations I88 to the
closed or film engaging position thereof. By 15
pulling back a control knob, the corresponding
pin releases the perforations which it engaged,
the segment and the roller arm can be rotated
and the latter again arrested in its second posi
tion by releasing the control knob. The opera 20
tion of the sprocket device, in cooperation with
the ?lms and the apertures, will be described
hereinafter.
,
The camera comprises three diiferent power
driven units, namely, the aperture unit with two 25
film feeding movements, the ?lm sprocket and
take-up spool »'drive, and the shutter drive. In
order to make the various drives properly ac
cessible and easily and independently adjustable,
a power distribution gear is arranged in gear
box 8, and the three units are independently
driven by three shafts vertically ascending there
from. The distribution gear comprises bearings
288, 28I, 282, 283, 284, 285 and 288 (Fig. 3) at
tached to the top of the gear box and three
shafts 281, 288, 288. Shafts 288 and 288 are
connected with shaft 281 by spiral gears 2H and
2I2. Each of these three shafts 281, 288 and
288 has a square end for coupling it with a ?ex
ible shaft or other driving device by means of 40
receptacles 1 (as described before), which per
mits power supply from either side and from
the back of the camera. Vertical shafts 2I8, 2H
and 2I8 are driven from shafts 281 and 288 by
means of spiral gears 22I, 222 and 223. The 45
shafts U8, 2“ and 2I8, respectively, are sup
ported by thrust bearings 228, 221, 228, 23I, 232,
283 (Fig. 2) and run in oil-tight housings 23,
I33 and I34, as described hereinbefore. The
shutter drive shaft 2I8 drives a shutter shaft 60
231 over spiral gear 238, supported in housing
22 of front wall 2| by two tapered roller bearings
238 and 238, and accessible through cover screw
248 (Fig. 2). A shutter 45 of conventional design
in Fig. 1. Each scissor unit has a hub ill, a
roller arm I ll, a segment arm I88 and a segment
is mounted on an extension of shaft 231 which 55
I88 (Fig. 9). Two adjacent units cooperate like
rotates between lens system L and prism sys
the blades of a scissors, ‘swinging with their hubs
on tube I41, the hubs of two cooperating scissor
units being at opposite sides of the arms, with
the roller arms intermediate thereof, and the
segment arms attached at about the middle of the
‘ hubs." Each of the upper roller arms belonging
to sprockets Ill and I42, supports (Figs. 5 and
6), by means of 'pins, four rollers I1I, I12, I13,
I14 and 21I, 212‘, 213, 214, respectively, rollers
I12, I13 and 212‘, 213 respectively. having the
purpose of holding the film against the sprockets,
whereas rollers HI, 2" and I14, 214, respectively,
70 support the ?lms as they leave the sprockets.
The lower roller arms, belonging to sprockets Ill
and I42, have only three rollers I18, I11, I18 and
218, 211, 218, respectively, arranged like ‘upper
rollers I12, I13, I14, 212, 213 and 214. The
75
only three rollers I8I, I82 and I83 correspond
ing to rollers I1I, I12 and I13 of the correspond
ing arm of sprocket I42. The lower roller arm
of sprocket I43 has two rollers I88 and I81 ar
ranged similar to rollers I18 and I11 (Figs. 5, 6
upperrollerarmbelonginstosprocht luhll'
protrudes beyond the housing 22. ‘The shutter
tem P (Fig. 1), partly in the housing formed by
the halves 28 and 38 of front wall and side door,
respectively, as described in the above-mentioned 80
application Serial No. 558,193.
In order to assure hamonious operation of the
two ?lm movements they are both driven from
shaft “1 over a single spiral gear wheel 2“
gneshing with two gear wheels 2lI and 242 (Fig. 65
4). Shaft 2I1 runs in housing I34 of the main
supporting block 8| in thrust bearings 221 and
232. Gear wheels 2“ and 242 drive the two
short ?lm movement shafts 245 and 241 (Fig. 4)
which are supported in aperture ?anges 8| and 70
82 by means of bearings 248 and 248. As de
scribed in the above application, the aperture
?anges II and 82, mounted on block ?anges l3
and 54, are adjustable longitudinally of the block
?anges. They may also be adjusted perpendicu 76
9,107,628
larly to the block ?anges, as for example by
shimming. This adjustment is made possible
by the peculiar arrangement of gears 2H), 24I
and 242 whose, mesh is not aifected by such ad
justments. Although the timing of the move
ments is very slightly affected thereby, the ad
justment ‘amounts ordinarily to only a few thou
3
P, as shown in Fig. 8. Upon emerging from the
?lm gate, the two superposed ?lms B and R are
again separated and returned to their sprocket
wheels with loops converse of those between the
upper rolls and the ?lm gate. The ?lms B and R .5
sandths of an inch and its effect on timing is
therefore negligible. These gears are enclosed
1.0 in a cover 25] in the angle between the two main
block ?anges (Fig. l). The ?lm movement gear
wheels 210 and 212 are ?xed to the other ends of -
shafts 241 and 246, respectively, and drive the
registering and advancing pins of the ?lm move
15 ments, as described hereinbefore. Since the‘
movements are intermittent in their action they
require an intermittent ?ow of power supply
which must be equalized by rotating masses. In
order to prevent undesirable interferences be
20 tween separate ?ywheels for each movement, a
single ?ywheel 250 is employed according to the
present invention. Since it is mounted on shaft
2 I1, either within the gear box as shown in Fig. 2,
or elsewhere, it acts upon both movements driven
25 from the same shaft.
The sprocket drive shaft 2I8 supported by
thrust bearings 228 and 233 runs within housings
I33 and I3I and drives the gear wheel I38 (Fig. l)
on shaft I35 by means of spiral gear I32. From
30 pulley I39, also fastened to the sprocket shaft
I35, a belt drive 252 leads through housing 43
(Fig. 2) to pulley 253 of the take-up spool gear
which again drives in appropriate manner the
three take-up spools for the three ?lms which
are now introduced between rollers I11 and I18
and 211 and 218, respectively, their perforations
engaged at the lower side of the sprocket rollers
HI and I42, where they are secured by rollers
I16 and I11 and 218 and 211, respectively, and 10
brought out over‘the upper side of rollers HI
and 21I, respectively. As described before the
emerging ?lms are threaded between rollers 252
and 253 of the light seal and are ready to be
wound upon the three take-up spools in maga 15
zine 50, which are arranged similar to the spools
in magazine 68 and driven from pulley 253.
It should be understood that the present dis
closure is for the purpose of illustration only, and.
that this invention includes all modi?cations and 20
equivalents which fall within the scope of the ap
pended claims.
I claim:
1. A motion picture camera comprising a rigid
supporting block, a driving gear wheel on said 25
block, two ?lm gates, two ?lm movements for
transporting ?lm through said gates each having
a driven gear wheel, and means for mounting said
gates and said movements on said block with said
gear wheels meshing, said driving and driven 30
gear wheels being maintained in de?nite relative
position by said block.
'
are inserted in magazine 60 on a shaft (not
2. A motion picture camera comprising a rigid
supporting block, a driving spiral gear wheel on
said block, two ?lm gates, two ?lm movements 35
for transporting ?lm through said gates each
having a driven spiral gear wheel, and means for
mounting said gates and said movements on said
shown) which is substantially parallel to sprocket
block with said gear wheels meshing, said driving
35 are mounted on a shaft (or on concentrical or
parallel shafts) parallel to the sprocket shaft I35.
In order to thread the ?lms, three ?lm spools
40 shaft I35, the ends of the ?lms being secured
to three take-up 'spools similarly arranged on
shaft I58. The ?lms are threaded between roll
ers 25I, ‘252 and 253 of the light seal 49 so that
the three ?lm loops are now arranged parallel
45 side by side. Assuming that the ?lms are to be
exposed as described before with reference to
Fig. 8, the ?lm B bearing the blue recording emul
sion is next to side door 36 and above sprocket roll
I4I, the ?lm R with the red recording emulsion
50 is in, the center above sprocket roll I42 and the
green recording ?lm G is next to the sprocket
drive above sprocket roll I43. The ?lms are
wound upon their spools in such a manner that
the emulsions of ?lms B and G face roller 25I,
55 whereas the emulsion of ?lm R faces roller 252.
The scissor units areopened and'kept in this posi
tion by knobs I9I to I96, which, during the
threading operation, are consecutively moved
into closed position where they are again arrest
60 ed by the knob pins and segments.
The ?lms
are threaded in the following manner. Each ?lm
is first inserted between rollers HI and I12, 21I
and 212, respectively, and I8l and I82, respec
tively (Figs. 5, 6, '1), and ?lms B and R, after the
65 sprocket pins are inserted into the ?lm perfora
tions, are brought out again between rollers I13
and I14 and 213 and 214, respectively (Figs. 5 and
6). Film G emerges between sprocket roll I43
and driven gear wheels being maintained‘ in de
40
?nite relative position by said block.‘
3. A motion picture camera comprising a base
plate, driving means on said plate, a rigid cen
tral supporting block ?xed to said plate, a driv
ing gear wheel mounted on said block and ro 45
tated by said driving means, two ?lm gates, two
?lm movements for transporting ?lm through
said gates each actuated by a driven gear wheel,
and means for mounting said gates and said
movements on said block with said driving and 50
.driven gear wheels meshing, said gear wheels
being by said block maintained in rigid position
relatively to each other and to said plate.
4. A motion picture camera comprising a base
plate, a driving main shaft extending along said 55
plate, a rigid central supporting block ?xed to
said plate, two ?lm gates, two-?lm movements
for transporting ?lfn through said gates each
actuated by a driven ?lm movement gear wheel,
means for mounting said gates and said move 60
ments on said block, a group of substantially
coaxial ?lm ‘sprockets for feeding ?lm to said
movements actuated by a driven pinion, a ?lm
movement shaft rising from said plate, driven
from said main shaft, having a driving’ gear 65
wheel mounted on said block and meshing with’
said ?lm movement gear wheels, and a sprocket
shaft rising from and mounted on said plate,
and. roller I83 (Fig '7). Films B and R are now driven from said main shaft and having a driv
ing ‘gear 'wheel meshing (with said pinion, said 70
70 turned a quarter turn longitudinally, and a half 1 driving
and driven gear wheels being" by said
turn laterally towards aperture plate SI (Fig. 1).
whereby the two ?lms are superposed so that they
form a single loop, and they are now threaded
into the ?lm gate, the two emulsions being in con
75 tact with the blue sensitive ?lm nearest to prism
plate and said block maintained in rigid posi
tion relatively , to each other.
5. A motion picture camera comprising a gear
box having a top portion forming a camera base 75
4
2,107,628
plate, a main drive shaft in said box mounted
for transporting ?lm to said movements mounted
underneath said plate, a central supporting block
?xed to the upper side or said plate, two ?im
movements each actuated by adriven gear wheel,
on said plate and actuated by a driven pinion, a
second auxiliary shaft extending through said
plate driven from said main shaft and having a
means for rigidly mounting said ?lm movements
on said block, an auxiliary shaft extending
through said plate driven from said main shaft
and having a driving gear wheel meshing with
driving gear wheel meshing with said pinion, |
and a ?ywheel ?xed to one oisaid auxiliary
shafts within said box.
JOSEPH A. BALL
said driven gear wheels, a group of sprockets
‘
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