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Патент USA US2126302

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Aug. 9, 1938.-
>www A. Yonne. JR
/_ 2,126,302
PHOTOGRAPHÍC SHUTTER C_OANTROL
Filed Oct. 21, 1936
>
l 5049
2 Sheets-Sheet 1
FIG'.1
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INVENTOR.
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ATTORNEYS
Aug. 9,1938.
D'ARCY A. YOUNG. JR
2,126,302
PHOTOGRAPHIFC 'SHUTTER CONTROL
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Filed oct, 21, 1956 -
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Patented-Aug. 9, 193s 'v
» 2,126,302
PATENT oFElc
` f UNITED STATES
2&126’302
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PHOTOGRAPHIC SHUTTER CONTROL
D’Aroy A. Young', Jr., Rochester, N. Y., assignor to
' Eastman Kodak Company, RochestenN. Y., a
corporation of New Jersey
Application October 21, 1936, serial No. 166,831
9 Claims.
This invention relates to photography and more
(ci. eas-57)
Figure 2 is a front elevation of Figure l with
particularly to photographic shutters. A'One object
of my invention is to provide a photographic
parts being shown in section;
’
.
Figure 3 is a vertical section on the line 3-3
shutter in which shutter members are adapted
5 to cover and uncover an exposure aperture, and
of Figure 2;
in which separate power springs are used to
drive the shutter members positively'to both open
and close the exposure aperture. Another ob
of Figure 2;
'
Figure 4 is a fragmentary section on line 4--ß 5 '
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.
Figure `il is a top plan of the speed4 scale and
index;
.
Figure 6 is an enlarged plan view of the speed
ject oi my invention is to provide a shutter with .
1o separate power drives for opening and closing the
shutter, and to provide a means for determining
selector mechanism;
y,
i
Figure 7 is a perspective view of the speed
the duration oí exposure by a timing mechanism, `
permitting one spring to function in advance of ‘
selector stops and other adjacent parts “ex
ploded”;
the other. Still another ‘object of my invention
is to provide a shutter structure in which a timing
Figure 6;
Figure d is a detail section on line d--B of
_
Figure 6;
which can be regulated. Another object of my
Figure 6, and
sisting oi a plurality oi protuberances rotating
gaged by a trip mechanism for controlling the
time ci’ a shutter exposure. Another object of
25 my invention is to provide a shutter of the cur
tain type in which two shutter members may be
driven by two springs, and in which mechanism
is included for permitting the operation of one
spring in advance of the operation ci the other`
30 spring. .another object of my invention is to
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.
Figure ‘10'is a detail section on line lil-_4d of
.
_
Figure l1 is a perspect've view'of a modified 20
'20 invention is to provide a control mechanism vcon
in timed relation, any one of which may loe en
to
Figure 9 is a detail section on line 'il-9 of
mechanism for controlling the relative'operation
of _two power springs consists of a lost motion
connection, _the duration of the lost motion of
_
detail.
,
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One of the chief features of my invention is
the- control mechanism 'which is interposcd'be
tween two latches controlling two power drives,
.one ‘drive being adapted to move -the shutter 25
members so that the exposure aperture will ‘oe
opened, and the other drive being adapted to
move the shutter members so that the xposure,
aperture will be closed. Thus, l prefer to use
-two springs, one for opening the shutter and the 3_0
provide a curtain shutter with a means for ' other for closing the shutter, and l prefer to vary
simultaneously setting two power springs and the timing of these two springs by a lost mo
with a means :for tripping said springs one after
the other. Still another object or my invention
A35 is to provide a means forvarying the time of
exposure through a lost motion connection corn
prising a series of rotatable toothed disks, and
»to provide a means for cooperating with these
adapted to trip the shutter closing spring, and
40 other objects will appear from the following
specification, the novelv features being particu
iarly pointed out in the claims at the end thereof.
As one form oi my invention l have illustrated
a shutter which has been constructed for use
45 with stereo cameras in which a pair of objectives
are used. However, while the illustrations show
a preferred embodiment of my invention in which
two shutters are used side by side, my invention
'50 is equally useful for a single shutter and camera
employing only the more common single objec
tive, since exactly the same control device _is used
55
tion connection, the duration of which can be
altered at will.
‘
In the illustrated embodiment of my inven- 35`
tion the shutter members may conveniently be
curtains which are commonly used in the so
called focal plane type of shutters.
_
Since I have shown a shutter housing contain
ing two shutters and two exposure apertures, I 40
wish to point out that the following description
refers to one shutter only, except where other
wise specifically stated. »The two shutter struc
tures are identical and a _description of one will
be sufficient for both and is preferable because I 45
also contemplate making a single shutter with
exactly the same control mechanism which is
illustrated and which, inthe present embodiment
of my invention,l is used for both shutters. It is,
of course, necessary in stereo shutters to have 50
both give exactly the same exposure.
The operating mechanism of the __shutter Iis
for one shutter as is used for the doubleshutter
shown enclosed within a housing or case 20 hav
in the embodiment illustrated herein.
ing a baclr'ZI and top and bottom walls 22 and 23',
respectively, and end walls 24 and 25. Means, not 55_
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Figure 1 is a plan view, partially in section;
2
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illustrated, are provided for mounting the case in
or on a camera, and when mounted, the back 2lA
is preferably close to the focal plane. Apertures
2O in the back 2| are located in the required
positions and concentric with“ the twin lenses.
'I‘he latter are not shown in the drawings, their
positions being merely indicated by broken-line
circles at 21.
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'I‘hecurtains of the shutter are arranged in
10 duplicate to cover the apertures 28 and to pass
across said apertures in unison when being wound
and when released. The duplicate curtains are
front curtain 28, releasing the latter at a prese
lected interval after the curtain 3i has started
downward to uncover the exposure aperture 2l.
One element of said means comprises a hooked
trip lever 6U that fits and is slidable on a flattened,Í 5
portion Il of shaft 43, although this is a detail
of construction that may be modified, and might,
for instance, be a spline key or groove and tongue.
The trip lever in is slotted at 62 on the upper side
of its hub portion, and a pin $3 depending from
a crankA arm 64 projects into said slot. The arm
B4 is connected to an opposítely extending arm
65, both arms being supported by a bearing 66 so
preferably spaced apart suiliciently to afford
room for the timing selector, which in the draw A they may be swung in a. plane parallel to shaft 42.
ings is designated broadly bythe letter “S". In
To accomplish this movement and to causethe
the following description of the curtains the op
lever Gli to assume selected positions, a pin 61 on
eration of one applies also to the other, and the the arm 65 engages a cam slot 68 in a disc 6! that
various corresponding parts of the duplicate as
is close to the top of casing 20. A stub shaft 10, to
semblies bear the same reference numerals.
which said disc is attached, extends through the
20
'I'he front curtain 2l is wound on a. roller 28l casing to a selector knob 1I (Figs. 1 and 5)~ which
and on a spring-actuated return roller> 3l. This carries an index pointer 12 that overlies a circu
curtain has an aperture 2la. of the same dimen
lar time scale 13. When the knob 1l is turned
sions as aperture 26 in the back wall 2i. The to align the index 12 with the selected shutter
rear curtain 3| is wound on a spring-actuated
speed on the scale 13, the cam slot 88 engages
the pin 51 and swings the arms 65 and 64' about 25
the bearing center 66, and the pin B3 moves trip ‘
tapes 32 which are attached to and wound on lever G0 toward the right or left end of shaft 43.
drums I4 and 34a, which are fixed to shaftv 35 '
As before mentioned, lever 60 is arranged to lift
on which roller 2l is freely revoluble. The tapes or turn with shaft 43, as is also detent 42 which
30 also pass over an idler roll 33a.
holds iront curtain 28 in “wound” position by
T'he shaft 35 ,carries a pinion 26 that meshes engaging shoulder 44 on the end flange 45 of roller
with'a gear 31 attached to Áa winding knob Il. 29. Therefore, if the trip lever 60 is raised a re
When the latter is rotated in the direction indi
quired distance, the shaft 43 is rotated sufiiciently
cated in Fig. 2, the shaft 35 turns the drums 34 to lift the hooked end of detent 42 over shoulder
35 and 34a and begins to wind up the rear curtain 3i
44 on flange 45 of roller 29, and the front curtain
by means of the tapes 33. The drum 34 carries a will be released.
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roller 32 below and in front of the roller I0, and
the upper portion of this curtain terminates in
lug 3l that strikes a similar lug 4l on the roller 2f
To provide the required variable “lead” of the.
after the drum 34 has turned a small part of on'e
rear curtain in advance of the beginning of the
rcvolution,`or a distance sufficient to carry the downward movement of the front curtain, a series
40 upper edge of curtain 3| past the upper edge of
of detent actuators are provided to lift the de
aperture 25a in the front curtain.> Further wind . pending end of trip lever 60 at the required time.
Á ing of the knob completes the movement of both 'I'hese actuators consist of lugs projecting from
curtains to the “set” position, indicated in Fig. 3.
In this position .both the roller 2l and the drums
45 I4 and 54a are urged toward the direction oppo
site to the arrows in Fig.> 2, by torsional coil
springs within the rollers ll and 32,> as shown
at 4I in Figs. 2 and 3. The curtains are held in
the wound or set position by a latch 42 (Fig. 6)
mounted on a'shaft 43, and which engages a
shoulder 44 on the end flange 45 of roller 29.
The shaft 4I and a parallel shaft 4I near the
back of the casing 2l carry a series of detents in
the form of arms or hooks, some of which are
55 free on these shafts and 'some fixed thereto, as
will be described. Shaft 43, hereinafter desig
nated as the detent shaft, is supported on bearings
41, while the shaft 42, or release shaft, may be
turned in bearings 4l by downward movement of
a release lever 4I that is fixed to said shaft,
against the action of a spring 5l.
On the detent shaft 4I and free to turn thereon,
is a detent 5I, thehooked rnd 52 of which drops
into a notch 52 in the'end flange 54 of drum 34a,
65 to retain the rear curtain in “wound"V position
(Fig. l0). An extension 5_5 on the detent 5I
projects into the path of an arm I8 which is fixed
to shaft 44, so that when the lever 49 is depressed,
the arms 5l will raiseA the detent 5I and free the
70 hook l2 from the notch l2, thereby permitting
the rear curtain Il to be returned to the "un
wound" position of Pig. 11.
the edges of discs `1li, 16, 11, 18 and 19 that are
free to revolve on shaft 35 and which lie between
one drum 34a on said shaft and a fixed bearing
80 that serves as a guide for one of the tapes 33
in place of a flange on one drum 34a.
'I‘he lug 15a on disc 15 projects laterally into
notch 53 in flange 54, so that when fthe hook 52
is'raised out of said notch by the movement of
release lever 49 and arm 56, the rotation of drum
54a carries disc 15 around with it. Lug 16a on
disc 16 projects into the path of lug 15a, so that
after the latter has moved through several de
grees of arc the disc 16 begins to turn. Likewise
in succession discs 11, 18 and 19‘ are picked up by
the lugs 11a, 18a and 19a of the remaining discs.
Anyone of‘the lugs 15a-19a is adapted to
contact the underside of the“ hooked portion
of trip lever 60 and to raise it, thus turning 00
the detent shaft 43, which latter, in turning,
raises the detent 42 which is fixed to it and
releases the front curtain. The _time interval
between the release of the rear `and front cur-`
tains is determined by the position ,of =trip lever
il, and the further to the right (Fig. l) this
detent is, the greater will .be the time interval
or the wider the shutter “slot,” due to the
«cumulative "pickup” of the selector discs 15-1l.
On the winding movement of the shutter, the
discs 15--19 are circumferentially spaced in given
.Means are presently to be described whereby relative positions by successive engagement, first,
a “slot” may be formedl between the`upper edge of the lug 15a by the following edge of notch 52,
75 of the rear curtain Il and the lower edge of the Athen engagement of lug lla by a lug 15b on 75
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2,126,802
the control for the two curtains forming one
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-disc 16, then engagement of lug Ífila by lug 16h,
etc.
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shutter are exactly the same.
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Tol permit “bulb” exposures to be made, it is
necessary to release the rear curtain and per.
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1. Inra photographic shutter, the combination,
with Va casing including exposure' aperture
mit it to'be wound on roller 32, thus fully un
covering apertures 26, and then'to release the <,therein, of shutter members adapted to cover
front curtain after the desired exposure inter
and uncover said exposure apertures, two springs .
val, as- determined manually by the operator, connected to the shutter members one for open
that is, the operator may depress lever 49, which ing the exposure aperture and the other for
closing the aperture, a control device'including 10'
10 frees the rear curtain, and when the> lever is
permitted to return to normal under the in
two latch members adapted to hold the springs
iluence of spring 50, the front curtain will be ' inactive, a tripping device for releasing one
released.
latch, a lost motion connection between the first '
„
Means for accomplishing this _result comprise
15 a “bulb” detent 85, the hooked end- 85a of which
is adapted to engage a shoulder` 86 in the _disc
18, this disc being thicker than the others to af
ford room for said _\shoulder. Detent 85 is
normally freed from »the shoulder 8,6 `by a light
20 sprin'g 81, although in- Fig. 9 it is shown in en
gagement with said shoulder. This engagement
is accomplished by means of a block 88, slide
able on release shaft 46 and arranged to turn
with said shaft, and having a ñat extension 89
25 that is adapted to lie close to the back of detent
85 (Fig. 9) when the block is slid'to the position
of Fig.
6.
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The latter movement occursA at n’the extreme
end of the counter-clockwise rotation of selector
knob ‘il >(Fig. 5), at which point a downwardly
z _projecting lug 90 on cam disc 69 contacts an
upstanding lug 88a on the block 88, moving
the latter towardthe left (Fig. 6).
When're-=
>leased shaft i6 is turned by depressing lever
35 49, the extension 89 swings detent 85 so'that
the hook 85a bears against the disc 18, and,
connected to the shutter members one for open
ing the exposure' aperture and the other for 30
closing the aperture, a control device including
two latch members adapted to hold the springs \
inactive, a tripping device forreleasing one latch,
'a lost motion connection between the first,and
second latches, said -lost motion device compris 35
ing a. plurality of revolvably mounted washers
each having interengaging lugs whereby-one may
picking of discs l5, 16, and 11, the hook 85a
be turned by another when the lugs are brought
vinto contact, at least some of the‘washers be
engages shoulder 86. `
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is thus prevented, andÍ as the rear curtainy at this
time has moved far enough to uncover aperture
26, the latter remains uncovered until lever
49 is released.
50
and uncover said exposure apertures, two Springs `
when the> latter has been carried >around by the
40 , Further rotation of the series of selector vdiscs
45
and second latches, said lost motion device com
prising a plurality of revolvably mounted Washers 15
each having interengaging lugs whereby one may
be turned by another when thelugs are brought
into contact, at least some of the washers being
provided with tripping lugs, a trip lever adapted
to be operated by a tripping lug, and connections 20
between the tripping lever and second latch for
‘operating the latter bythe former whereby one
spring is operated after the other so that -the
shutter members are positively opened and closed.
2. In a photographic shutter, the combination, 25
with a casing including exposure aperture
therein, of shutter members adapted toA cover
.
This release movement permits shaft 46 to
turn under the influence ofv spring 50, and to
swing hook> 85a away from shoulder 86. The
rear curtain 3i then continues its movement
under the influence of its spring 4I, thev disc
'i8 rotates, lug '58a strikes lug 19a, and the,l lat
ter raises the trip `lever 68 and detent 42,
thus permitting the front curtain 28 to bewound-
ing provided with'tripping lugs, a trip lever 40
adapted to be operated by a tripping lug, and
connections between the tripping lever and sec
ond latch for operating the latter by the former »
whereby one spring is operated after the other
vso that the shutter members are positively 45
opened and closed, and a movable mount for the
tripping lever on which the lever may be moved
to engage a selected tripping lugto vary the
duration of the -lost motion between the actua
tion of the two springs. '
3. în a‘photographie shutter, the combination,
on roller 3|! and to again cover aperture 26.
with a casing including exposure aperture there
in, of shutter members adapted to cover and
` In Fig. l1 a modiñed form of selector discs
55 are shown, wherein the various lugs that are
uncover said exposure apertures, two springs
adapted to strike and lift detent 68 are on‘a se
50
connected to the shutter members one for open 55
ing the exposure aperture and the other for
ries'of discs Q5, 96, Si', 98, 9.9, that are pinned
closing the aperture, a control device including
two latch members adapted to hold the springs
inactive, a tripping device for releasing one latch,
requires the roller> 29 to be of such a diameter > a lost motion connection between the first and 60
that one complete revolution thereof will be suffi
second latches, said lost motion device compris
at ili?‘ to the 'drum 34a so that the drum and
disc are in eiïect integral. This modification
eo
cient to move any: of the lugs on the cylinder
from the “wound” position up to and into con
tact with the hooked lever 60. Each of the two
65 shutters are identical as to their operation and
they are both under the control vof a single
releasing and turning device.
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.While 1_ have described> a preferred embodi-v
70 ment ofA my invention as applied‘to a duplex
shutter for stereo cameras, it is obviously not
limited to .such 'an- embodiment being equally
>useful for the more usual type of cameras utiliz
ing a single objective. In such cases one of
75 the shutters may be omitted, but in either case
g
ing a plurality of revolvably mounted washers „
each having interengaging lugs whereby one may
be turned by another when the lugs are brought
into`\ ontact, at least some of the washers being 65
pro ded with tripping lugs, a trip lever adapted
to be operated by a tripping lug, and connections
between the tripping lever and/second latch for
operating the latter by the former whereby one
springY is operated after the other so that the 70
shutter members are positively opened and
closed, a movable mount for the tripping lever, _
means outside of the shutter casing for mov
-ing the tripping lever into position to engage 75
4
a ‘selected tripping lug whereby the time of ex
posure may be predetermined.
ently of the other a predetermined distance and
_ then may turn with the next washer, and means
engaging a radial lug of any one of the plural
4. In a photographic shutter, the combination,
with a casing including exposure aperture there
in. of shutter members adapted to cover and
uncover `said exposure apertures, two springs
connected to the shutter members one for open
ing the exposure aperture and the other, for
closing the aperture, a control device including
two latch members adapted to hold the springs
7. A timing device for shutters including shut
ter mechanism for opening and closing a shutter
aperture and comprising two springs, one for
Aopening the shutter mechanism and the other
for closing the shutter> mechanism, latches for
ity of washers for timing the tripping of the
second latch to complete the exposure.
_
inactive, a tripping device for releasing one
_holding the springs against movement, and a
latch, a lost motion connection between the first
and second latches, said lost motion device com
lost motion connection~ for controlling the rela
tive operation of the latches, means for trip
prising a plurality of revolvably mounted wash
ping one latch manually, said lost' motion con
nection comprising a shaft, a plurality of lugs
15 ers each having interengaglng lugs whereby one
may be turned by another when the lugs are
brought into contact, at least some of the wash
extending radially of the shaft, one of said lugs
being adapted to turn therewith, said shaft be
ing connected to and controlling the shutter
opening spring, a movable member adapted to
ers being provided _with tripping lugs, a trip
lever adapted to be operated by a tripping lug,
20 and connections between the tripping lever and engage a selected lug, connections between the 20
second latch for operating the latter by the movable member and ~the second latch for trip
former whereby one spring is operated after ping the latter after a time interval permitting
_the other so that the shutter members are- the shutter closing spring to function.
8. A timing device for shutters including shut
positively opened and closed, a movable mount
for the tripping lever, a knob pivotally attached ter mechanism for opening and closing a shutter 25
to the outside of the shutter casing and adapted aperture and comprising two springs, one for
to position the tripping lever to engage a opening the shutter mechanism and the other
selected tripping lug to determine the time of for closing the shutter `mechanism, latches for
holding the springs against movement, and a
exposure.
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5. In a photographic shutter, the combination, -lost motion connection for controlling the rela 30
30
tive operation of the latches, means for trip
with a casing` including exposure aperture there
in, of shutter- members adapted to cover and ping one latch manually, said lost motion con
uncover said exposure apertures, two springs nection comprising a shaft, a plurality of wash
connected to the shutter members one for open- 1 ers ?evolvably mounted thereon having inter
"ing the exposure aperture and the other for engaging lugs, at least one washer being inter
connected with the shutter opening spring, each
closing the aperture, a _control device includ
ing two latch members adapted to hold the successive washer being adapted through the
springs inactive, a tripping device for releasing interengaging lugs to Abe driven by the driven
>one latch, a lost motion connection between the lug after the lost motion is taken up, a movable
first and second latches, said lost motiondevice member adapted to be' positioned to engage a
comprising a plurality of revolubly mounted selected washer lug, and to be operated thereby,
connections between the movable number and
washers each having interengaging lugs where
by one may be turned by another when the the closing spring latch for operating the lat
lugs are brought into contact, at least some of ter by the former, for closing the shutter mech
anism, and a setting member for positioning the 45
45 the washers being provided with tripping lugs,
movable member to vary the duration ot time
a trip lever adapted to be operated by a trip
ping lug, and connections between the tripping between the shutter opening and closing.
9. A timing >device for shutters including a
`lever and second latch for operating the latter
by the former whereby one spring is operated shutter mechanism for opening and closing a2
50 after the other so that the shutterfmembers are shutter aperture and comprising two springs, _one
positively opened andi closed, a moveable mount for opening the shutter mechanism and the
for the tripping lever, a knob pivotally attached other for closing the shutter mechanism, latches
for holding the springs against movement, and
to the outside of the shutter casing, a cam ca a lost motion connection, for controlling the
ried by the knob inside of the casing and en
rotative operation of the latches, means for 55
55 gaging the trip lever to position it to engage a
_tripping one latch manually, said lost motion
selected lug to determine the time of exposure.
6. In a photographic shutter, the combination, connection comprising a shaft, a plurality of
with a shutter casing having exposure apertures, rotatably mountedv «lugs projecting radially from
of shutter members for opening and closing the said shaft, each lug being spaced axially from
460 exposure apertures comprising separate curtains, leach of the other lugs, a member movable axially
ofthe shaft and adapted to be positioned for
a separate power spring for each shutter mem
ber, means for simultaneously tensioning both engaging any one ofthe radially and axially
springs, a latch for holding each spring under spaced lugs vand adapted to be actuated by a
tension, means to manually trip one latch, means lug, connections between the movable member
65
to automatically trip the second latch `includ
and thev closing spring latch for operating the 65
ing a lost motion device, whereby one latch ' latter by the former for closing the shutter
may be tripped a predetermined time >after the
`other latch -to produce an exposure, a plurality
of rotatably mounted, washers each having a
70 radially projecting lug and each having inter
engaging lugs whereby each rmay turn independ
mechanism, and a _setting member for position
ing the movable member to vary the duration
,of
exposure.
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D’ARCY A. YOUNG, Jn.
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