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G. _A. BRUEsKE
2,408,549
PHOTOGRAPHIC CAMERA
Filed Jan. 6, 1943
6 Sheets-Sheet 1
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INVENTUR
EEUREE A. EIRUE5KE
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Oct. 1, 1946.
G. A. BRuEsKE ‘i
2,408,549
PHOTOGRAPHIC CAMERA
Filed Jan. 6, 1943
6 Sheets-Sheet 3
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INVENTUH
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G. A. BRUESKE
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PHOTOGRAPHIC GAMER,A
Filed Jan. 6, 1945
s sheets-sheet 4
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Oct. 1', 1946.
G. A. BRUESKE
2,408,549
PHOTOGRAPHIC CAMERA
Filed Jan. S, 1943r
6 Sheets-Sheet 5
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INVE NTUH
EEURGE A. ERUESKE
BY
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Oct. 1, 1946.
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G_'A;_BRUEsKr-:
PHOTOGRAPHIC
CAMERA
2,408,549
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Filed Jan. 6, 1943
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v6 ASheets-Sheet 6
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INVENTUH
EEURGE A. EHUEEIKE
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ATTY.
Patented Oct. 1, 1946
2,408,549
UNITED STATES PATENT oFEicE
2,408,549
PHOTOGRAPHIC CAMERA
George A. Brueske, Wayzata, Minn., assignor Vto
The Bell & Howell Company, Chicago, Ill., a
corporation of Illinois
Application January 6, 1943, Serial No. 471,411
12 Claims.
l
My invention relates particularly to photo
graphic cameras of the “miniature” type, al
though not limited to this use alone.
Objects of the invention reside in the pro
vision of a novel, desirable, eiiective and con
venient exposure shutter control mechanism
which, providing a single exposure, prevents suc
cessive exposures or shutter actuations by reason
of the shutter control being retained in exposure
position, which convieniently provides single ex
(Cl. .9S-_55)
2
Figure 12 is a partial sectional view substan
tially on the line IZ-IZ of Figure 10;
‘Figures 13 and 14 are partial sectional views
similar to Figure 9 and showing parts in different
positions than those in which they are shown in
Figure-9; and
~
‘Figure y15 is a partial sectional View of a portion
oi "the mechanism shown in Figures 9, 13 and 14,
and showing parts in different positions than
10 those in which they are shown in these latter iig
posure, continuing intermittent exposures at im
ures.
>
mediately succeeding intervals, or bulb or “time”
Referring to the drawings, a camera casing is
exposure, or any two thereof, the invention being
generally designated at I and is provided with an
particularly adapted to a focal plane shutter in
intermediate transverse vertical partition 2, and
volving two shutter members which are relative 15 the>v upper rear portion of the casing is formed by
ly adjustable to vary the exposure opening of the
a separate casing portion 3 to provide access into
shutter.
the upper rear or iilm chamber portion of the
With these objects in view, my invention con
casing enclosure. See Figures 1, 2, 3, 5 and 6.
sists in certain features of novelty in the con
An exposure guide, generally designated at 4, is
struction, combination and arrangement of parts
arranged on the rear of the upper portion of the
by which the said objects and certain other ob
partition 2 and extends transversely in a vertical
jects, hereinafter appearing, are eiiected, all as
plane, the exposure guide including a trans
fully described with reference to the accompany
verse channel cn the rear face of the partition
ing drawings, and more particularly pointed out
and an exposure aperture 5 through the parti
in the appended claims.
25 tion and aligning with a light aperture 6 through
In the said drawings
a vertical transversely disposed frame plate 'l
secured in forwardly spaced relation with the
Figure 1 is a sectional View in front elevation
partition 2 and with a photographic lens mount
of a photographic camera with parts broken
opening 8 through the front Wall of the casing for
away and embodying my invention;
Figure 2 is a sectional view substantially on 30 the exposure of a frame of a ñlm 9 in the guide
the line 2-2 of Figure 1;
at the exposure aperture. See particularly Fig
ure 3.
Figure 3 is a sectional View substantially on
the line 3--3 of Figure 1;
Figure 4 is a partial sectional view substantial
ly on the line 4-4 of Figure 2;
.Disposed in the lower rear portion of the cas
ing are transversely spaced vtwin spring motors,
each comprising revoluble axle II journaled on
Figure 5 is a sectional view substantially on
the partition 2 and on a frame part I2 at the
rear of the partition,- a hollow cylindrical casing
the line 5-5 of Figure 1;
i3 concentrically journaled on the axle, and a
Figure 6 is a partial sectional view substantial
spiral power spring I4 within the casing and hav
ly on the line 8--5 of Figure 5;
ing its ends respectively connected with the cas
Figure 7 is a partial sectional View substantial
ing `and axle. See particularly Figure 5.
ly on the line 'l-l' of Figure l;
The axles II are connected in parallel for si
Figure 8 is a partial sectional View similar to
multa'neously Winding the motors by a gear train
Figure 1 with parts broken away and showing
IS operatively connected with a winding handle
parts in different positions from those in which 45 iìì on the exterior of the casing, and a usual one
they are shown in Figure 1;
way check clutch Il operative on the gear train
Figure 9 is a partial sectional view in front ele
retains the springs in wound condition. The eas
vation of the major portion of the exposure shut
ings I3 are connected in parallel by means of
ter control mechanism, hereinafter described;
Figure 10 is a partial sectional view of a por
tion of the take-up spool drive and step feed
gears I8 on the casings meshing with a gear I9
50 rotatably mounted on the partition 2 and the
frame part I2. See Figures 3 and 5.
A multiplying gear train 2| is rotatably mount
hereinafter described;
ed on the partition 2 and the frame part I2 at
Figure 11 is a partial section substantially on
one side of the motors and has its primary gear
the line I I--I I of Figure 10;
55 meshing With the gear I8 of the adjacent motor
mechanism control with parts broken away,
2,408,549
3
for the driving of the gear train, and the final
gear of this train drives a centrifugal speed gov
ernor 22 for controlling the speed of the mecha
nism driven by the motors. See Figures 2, 5
and 6.
A vertical shaft 23 is disposed within and at
one side of the casing at the rear of the parti
tion 2 and is journaled on vertically spaced
brackets 24 secured on the partition 2. This
shaft is driven by the motors by meshing right
angle spiral gears 25 respectively secured with
the primary gear of the gear train 2l and the
lower end of the shaft. A flanged film spool 2S
is rotatably mounted on the upper portion of
the shaft 23 in lateral alignment with the ex
posure guide 4 and beyond one end thereof for
taking up the film 9 from the adjacent end of
4
horizontal position on the upper portion of the
front face of the partition 2 above and below the
exposure aperture 5 to form a transversely ex
tending slide guide. See Figures l, 2 and 3. Two
light shutter members 31 and 38 are slidably
mounted in this slide guide for independent re
ciprocating movement transversely across the
aperture 5 for exposing the portion of the film
9 thereat as hereinafter described.
Two transversely spaced generally vertical
arms 39 and 4| are disposed forwardly of the
partition 2 and have their lower portions pivoted
as designated at 42.
The upper ends of the arms
39 and 4| are operably connected respectively
with the shutter members 31 and 38, as designated
at 43, for independently reciprocating these shut
ter members.
A shaft 44 is journaled on the frame part I2
the guide and feeding the film thereto.
and the frame plate 'l and extends through the
The lower flange of the spool 26 constitues a
friction clutch member providing a downwardly 20 partition 2 and has a gear 45 fixed thereon which
meshes with the gear i8 of one of the spring
facing friction clutch surface 21, and a ñanged
motors for the driving of this shaft therefrom.
and bored clutch member 28 is slidably mounted
See Figure 2.
on the shaft 23 and has an annular member 29
A radial cam 45, see Figures l, 5 and ß, is se
of friction material secured concentrically on the
upper face of the flange thereof for frictional 25 cured on the shaft 44 for rotation therewith im
mediately in front of the partition 2, and a sec
engagement with the surface 21 in an upper po
ond radial cam 41 is also disposed immediately
sition of the clutch member 28 to yieldably drive
in front of the frame plate 2 and is fixed on a
the spool 26 for taking up fllm thereon from the
rotatable shaft 48 which has its ends respec
exposure guide, as shown in Figure 2, the mem
tively journaled on the partition 2 and on the
ber 29 being disengaged from the surface 21 in
frame plate 1. The arms 39‘ and 4| are inde
a lower position of the clutch member 28 to per
pendently actuated in one direction, with result
mit the film being drawn from a roll thereof on
ing corresponding movement of the shutter mem
the spool, as shown in Figure 4. A pin 3l is se
bers 31 and 38, by torsion springs 49 associated
cured in a diametrical bore through the shaft
with the pivotal mountings of and operative on
23 and slidably engages in an axially extending
the arms.
diametrical slot 32 at the lower end of the clutch
Cam rollers 5l are mounted on the arms 39 and
member 28 for driving the clutch member from
«il a short distance above the pivotal axes thereof
the shaft. A coiled compression spring 33 en
which respectively engage the cams 46 and 41
circles the shaft 23 between the gear 25 of this
for actuation of the arms 39 and 4l respectively
shaft and the clutch member 28 and urges this
by the cams 41 and 45 in opposition to the springs
clutch member upwardly to engage the member
4B. See Figures 3, 5 and 8. Thus rotation of the
29 with the surface 21 for yieldably driving the
cams 46 and 41 effects independently and respec
spool 26 and to permit disengagement of the film
tively oscillation of the arms 4i and 35 and With
spool drive clutch, as shown in Figure 4.
A light tight film cartridge 34, see Figure 3, 45 them effects independently and respectively re
ciprocation of the shutter members 38 and 3l.
is suitably detachably secured in a vertical posi
The opposing vertical edges 52 of the shutter
tion upwardly within and at the other side of
members 31 and 38 are adapted to abut, as shown
the casing at the rear of the partition 2 and in
in Figure l, and are shouldered, as shown in Fig
lateral alignment with the exposure guide and
ure '7, for excluding the passage of light there
beyond the other end thereof for feeding the film
between when in such abutting relation, the shut
9 to the adjacent end of the guide from a roll
ter members, when separated, forming a variable
of the film on a usual rotatable film spool (not
exposure opening for exposing the portion of the
shown) within the cartridge and through a usual
film at the exposure aperture 5.
light excluding film slot (not shown) of the car
55 The cams 45 and 41 are driven together in ad
tridge.
justable timed relation in the following manner.
In exposing the film, it passes from the car
See Figures l, 3 and 8.
tridge to the exposure guide where it is inter
A spiral gear 53, which is fixed to the shaft 44
mittently fed, as hereinafter described, and, hav
for rotation with the cam 48, meshes with a
ing its extending end releasably secured to the
take-up spool in a usual manner not shown, is 60 spiral gear 54 which is fixed on an axially ad
justable transverse shaft 55. Likewise, a spiral
taken up thereon as the film is progressively ex
gear 55, which is fixed to the shaft 48 for rota
posed. After the exposure portion of the film has
tion with the cam 41, meshes with a spiral gear
been exposed, the drive clutch of the take-up
spool being disengaged and the step feed mecha
nism, hereinafter described, being disengaged
from the film, the fllm is rewound into the car
tridge by means of an exteriorly projecting wind
ing knob 35 rotatably mounted on the casing in
axial alignment with the cartridge spool and
drivingly connected with the cartridge spool by
means of a suitable clutching device (not shown)
which is engageable and disengageable as inci
_ 51 which is fixed on the shaft 55.
The angles of the teeth of the gears 53, 54, 56
and 51 are such that power transmission may be
effected in either direction therethrough, and
these gears are so proportioned that the cams
48 and 41 are rotated at the same speed, the cams
„ >being driven by the spring motors.
‘
The shaft 55 is rotatively carried in bearings
58 at opposite ends of a transversely disposed
carrier plate 58 which is mounted for transverse
movement axially of the shaft 55 by means of
dents respectively of mounting and dismounting
the cartridge.
Parallel shouldered guides 36 are secured in 75 elongated slots El through the plate and slidably
2,408,549
engaged on bearing studs 62 secured on the frame
granted May 19, 1942, on application filed by me,
and No. 2,283,586, for improvement in light shut
ter, granted May 19, 1942, 'on application filed
by Bruno Stechbart.
plate 1, whereby the shaft 55 is axially adjustable.
The angles of the spiral gears 54 and 51, as well
as those of the spiral gears 53 and 5B, are oppo
sitely inclined so that axial adjustment of the
Actuation of the shutter by the power springs
plate 59 and with it the shaft 55 and the spiral
is controlled in the following manner. See Fig
gears 54 and 51' relative to the gears 53 and 5B
ures l, 5, 8, 9, 13, 14 and 15.
effects corresponding adjustment of the phase
Two stop members 12 and 13 aresecured ‘on the
relation or timing of the cams 45 and 41.
shaft 44 for rotation therewith in axially spaced
The exposure cycle of the shutter starts with 10 relation and are provided respectively with axially
the shutter members 31 and 38 at the left end,
offset abutment stop formations 14 yand 15 facing
Figure 1, of their movement and in abutting or
in the direction of rotation of this shaft, the stop
closed relation.
As the cams 48 and 41 are ro
formations 14 and 15 being disposed in vangularly
tated from the start of the exposure cycle, the
cam >46 effects movement of the shutter member
38 to the rightin advance of corresponding move
spaced approximately diametrically opposite rela
tion.
A stop lever 16 is intermedi‘ately pivoted re
ment of the shutter member 31 to form the ex
mote from the stop members 12 and >13 on an
axis parallel to the axis 'thereof by means of a
posure opening of the shutter, after which the
cam 41 effects movement of the shutter member
mounting 11, and has an abutment stop
31 to the right normally in following fixed spaced 20 pivot
formation
18 at one end thereof disposedabove
expos-ure opening forming relation with the shut
the axis of the stop members 12 and 13 in op
ter member 38 for exposing the portion or frame
posing relation with the stop formation 14 and
of the film 9 at the exposure aperture 5 of the
position-able, in the pivotal movement of this
guide 4. The shutter member 38 remains at the
lever, in and out of abutting rela-tion with only
right end of its movement until the shutter mem
the stop formation 14 for stopping the shutter in
ber 31>reaches the right end of its movement in
abutting or closed relation with the shutter mem
ber 38, after which the shutter members are
moved to the left in abutting or closed relation
to the extreme left end of their movement or to 30
its closed or exposure cycle starting position as
shown in Figure 1.
A second stop lever 19 is intermediately piv
oted in coaxial relation with the lever 16 by
means of the pivot mounting 11, and has an abut
their exposure cycle starting position.
ment
stop formation 8| at one end thereof dis
Phase relation or timing adjustment of the
posed below the axis of the stop members 12 and
cams 48 and 41 by transverse adjustment of the
13 in opposing relation with the stop formation
carrier plate `59 and with it simultaneous axial
adjustment of the gears 54 and 51, effects adjust 35 15 and p-ositionable, in the pivotal movement of
this lever, in and out of abutting relation with
ment of the exposure opening formed by the
only the stop formation 15 for stopping the shut
shutter members 31 and 38, and the cams 46 and
ter in its closed or exposure cycle starting posi
41 are arranged for phase relation or timing so
tion
slightly in advance of stoppage of the shut
that the shutter member 38 may complete its
rightward or exposing movement before the shut 40 ter by the lever 16 as shown in Figure 15.
A third stop lever 82 is intermediately pivoted
ter member 31 initiates its rightward or exposing
movement, see the dot-and-dash-iine position 38’
of the shutter member 38 in Figure 1, thus afford
ing means for adjusting the exposure opening of
the shutter increasing to a maximum opening
embracing the entire exposure area covered by
Cl
in coaxial relation with the levers 1G and 19 by
means of the pivot mounting 11, and has an abut
ment formation ßêlat one end thereof disposed
below the axis of the stop members 12 and 13
the shutter or the exposure aperture 5 of the
in opposing relation with the stop formation 14
and positionable` in the pivotal movement of this
lever, in and out of abutting relation with only
the stop formation 14 for stopping the shutter in
i” or adjusting the exposure opening of the shutter
in the following manner. See Figures l, 5 and 8.
A shaft 83 is journaled in the partition 2 and
the frame plate 1 and is variably positioned by
members 31 and -38 are simultaneously disposed
respectively at the left or exposure cycle starting
guide.
The carrier plate 59 is adjustably positioned
a knob 6o on the exterior of the front wall of
the casing and rotatably fixed with the shaft 63.
A radial cam 64 is secured on the shaft 63 and
engages a cam roller 85 on the carrier plate 59
u
an open position thereof in which the shutter
position and at the right or at the end of the
exposure stroke thereof and in which instant
position of the shutter members 31 and 38 the
“ shutter opening embraces the entire exposure
area covered by the shutter or the exposure aper
ture 5, as hereinbefore referred to, for “bulb" or
for actuating the carrier plate to the right in
“time”V exposure.
Figures 1 and 8, and a spring 86 is operative on
The stop leversl 13, 13 and 82 are controlled
the carrier plate to actuate it in the other direc 60
in the following manner for effecting single ex
tion, whereby the plate is adjustably positioned
posure, continuing intermittent exposure, or
by angular positioning of this cam.
“bulb” or “time” exposure in the following man
The cam 64 is provided with steps ‘61, E8, 59
and 'H of progressively increasing radii cooperat
ing with the roller 65 to effect different prede
termined exposure openings of the shutter, the
step 1l of the largest radius effecting the smallest
exposure opening` see Figure 1, and the step 61
of the smallest radius effecting the largest ex
posure opening embracing the entire exposure
area covered by the shutter or the exposure aper
ture 5 of the guide, see Figure 8.
The above described shutter is similar to those
described and claimed in U. S. Letters Patents
No. 2,283,533, for improvement in light shutter,
ner.
Two adjacent vertical control bars 84 and 85
‘ are mounted for independent vertical movement
in the camera casing and terminate at the upper
ends thereof respectively with finger push but
tons 86 andY 81, accessible from the exterior of the
casing for independent manual actuation of these
control members downwardly. »See particularly
Figures 1 and 2. Springs 88 are “respectively op
erative on the contro-l members 84 and 85 to ac
tuate the same upwardly.
The end of the stop lever 1E opposite the stop
“ formation end thereof is provided with an up
'
2,408, 549
8
wardly facing radially extending abutment sur
face 89, and a spring 9| yieldably urges this lever
into position wherein the abutment stop forma
tion 18 is in abutting relation with the stop for
mation 14 of the stop member 12, as shown in
Figures 1 and 8. See Figures 1, 9, 13 and 14.
The lower end of the bar 84 is provided with a
laterally extending stud 92 which is engaged in
a radial slot 93 on the end of the lever 19 op
shown in Figure 1, the shutter mechanism is
actuated through the exposure cycle.
If the push button 86 is released before the
exposure cycle is completed, the lever 16 is again
positioned in abutting relation With the abut
ment 14 and the lever 119 is positioned out o1'
abutting relation with the abutment 15, so that
the shutter is stopped by the lever 16, as shown
in Figure 1. However, if the push button 86
posite the stop formation end thereof, whereby 10 is not released before the exposure cycle is com
pleted, the lever 19, being still positioned in
downward manually actuated movement of the
abutting relation with the abutment 15, is en
bar 84 effects positioning of this lever in abut
gaged thereby to stop the shutter at the com
ting relation with the stop formation 15 of the
pletion of the exposure cycle but in advance of
stop member 13 and upward spring urged actua
tion of this bar effects positioning of this lever 15 stoppage of the shutter by the lever 16, aS shown
in Figure 15. Subsequent release of the push
out of said abutting relation. The stud 92 over
lies the surface 89 0f the lever 16 to form a one
button 86 causes the lever 19 to move out of
engagement with the abutment 16 and causes
way connection operative between the levers 16
the lever 16 to move into abutting relation with
and 19 to position these levers respectively out of
and into said abutting relation upon manual ac 20 the abutment 14 for engagement therewith for
final stoppage of the shutter, as shown in Figure
tuation of the bar 84 downwardly, the spring 88
1. This cooperative action of the levers 16 and
of the bar 84 and the spring 9| normally position
19 prevents accidental repeated exposure by rea
ing these levers respectively into and out of said
son of the push button 86 being kept in de
abutting relation.
The lower end of the bar 85 is provided with a 25 pressed position at the end of the exposure cycle.
In making continuing exposures, the push but
laterally extending stud 9D which overlies the sur»
ton 81 is depressed which results in the lever 16
face 89 of the lever 16 to form a one-Way con
being positioned out of abutting relation with
nection operative between this bar and the lever
the abutment 14, the lever 19 remaining out of
16 to position this lever out of said abutting rela
tion upon manual actuation of the bar 85 down 30 abutting relation with the abutment 15, as shown
in Figure 14. Accordingly, the shutter continues
wardly, the spring 9| normally positioning the
to repeat its exposure cycle until the push but»
lever 16 in said abutting relation.
ton 81 is released to permit the lever 16 to be
A spring 94 yieldably urges the lever 82 into
positioned in abutting relation with the abut
abutting relation with the stop formation 14 of
ment 14.
v
the stop member 12, and the periphery of a cy
During the making of single and continuing
lindrical detent member 95, fixed on the shutter
exposures, the lever 82 is retained out of abut
opening control shaft 63 for rotation therewith,
ting relation with the abutment 14 by the de
engages a detent arm 96 of the lever 82 for re~
tent member 95 engaging the detent arm -96 of
taining this lever out of said abutting relation, see
Figures 13 and 14, except in the position of the 40 this lever. See Figures 13 and 14.
In making a bulb or time exposure, the ex
control shaft 63 in which the exposure opening of
posure opening control shaft 63 is positioned so
the shutter is at its maximum, see Figure 9, and
that the exposure opening of the shutter
in which position of the control shaft 63 a radial
through the medium of the cam 54 having the
opening 91 of the detent member 95 registers with
step 61 thereof engaged with the roller 65, as
the detent arm 96 for the entry of this arm there
hereinbefore described and shown in Figure 8_
into for permitting the lever 82 to be positioned
is at the maximum and so that the release
in said abutting relation with the stop forma
opening 91 of the detent member 95 registers
tion 14. A laterally extending stud 98, on the
with the detent arm 96 of the lever 82, as here
end of the lever 82 opposite the stop formation
inbefore described and shown in Figure 9, to
end thereof, overlies the surface 89 of the lever
eilect the positioning of the lever 82 in abutting
16 to form a one-way connection operative be
relation with the abutment 14.
tween the levers 16 and 82 to position the lever
With such Vcondition obtaining, depression of
82 out of said abutting relation with positioning
either of the push buttons 86 and 81 positions
of the lever 16 in said abutting relation, the
spring 9| of the lever 16 overpowering the spring 55 the lever 16 out of abutting relation with the
abutment 14 to initiate the exposure cycle and
94 of the lever 82 for eiîecting this positioning
positions the lever 82 in abutting relation with
of the lever 82.
the abutment 14. Depression of either of these
The shutter control mechanism functions for
push buttons being continued, the abutment
single exposure, continuing exposures, or “bulb”
60 formation 83 of the lever 82 is engaged by the
or “time” exposure, as follows:
abutment 14, see Figure 9 in which the bar 84
At the exposure cycle starting position of the
is in its lower position as a result of depression
shutter, both of the shutter blades 31 and 38
are at the left in abutting or closed relation as
of the push button B6, to stop the shutter in
shown in Figure 1, they being held in this posi
its open position in which the shutter members
tion by reason of the abutment formation 18
31-and 38 are at opposite ends of the exposure
of the lever 16 engaging the abutment 14. In
aperture 5, as hereinbefore described, in which
making a, single exposure, the push button 86 is
open position the exposure opening of the shut
depressed, which results in the lever 16 being
ter embraces the entire area of the exposure
positioned out of abutting relation with the
aperture 5. Depression of either of the push
abutment 14, thus permitting actuation of the 70 buttons 8B and 81- is continued for the length
shutter and also results in the lever 19 being
of time desired for exposure, after which the
positioned in abutting relation with the abut
depressed button is released, which results in
ment 15, see Figure 13, but the abutment '.'5
the disengagement of the lever 82 from the abut
being advanced from the abutment formation
ment 14 and closure of the shutter, the shutter
8| in the exposure cycle starting position, as
9
2,408,549
being stopped in its closed exposure cycle starting
position, as hereinbefore described.
r10
lation of the gear ||I and with it the shaft |08.
The arm |06 is provided with a relatively large
With reference to making bulb or time expo
sure, itwill be observed that the cams 45 and 41
operate through an angle approaching 180° from
their positions as effected by the stop lever 16
intermediate opening ||4 therethrough through
member through its abutting relation with the
take-up spool drive clutch.
which the shaft |08 extends, and a bored member
IIE is rotatably secured on the shaft |08 and is
provided with a crank pin ||6 slidably and rotat
engaging the abutment 14, in which the shutter
ably engaging a radial‘slot | |1 of the arm |06 for
members 31 and 38 are in their shutter closed
actuation of this arm with angular movement of
cycle starting position as shown in Figures 1 and`
the shaft |08. The rear end of the shaft |08 is
8, to their positions as effected by the stop lever 10 provided with a crank pin | |8 disposed above an
82 engaging the abutment 14 in which the shutter
upwardly facing shoulder ||9 on the clutch mem
member 31 is still in its cycle starting position
ber 28 for engagement therewith to actuate the
while the shutter member 38 is in its extreme
same downwardly and -disengage the take-up
open position, and that the high point of the
spool drive clutch when the shaft |08 is actuated
cam 41 is considerably less than 180°. However, 15 to one end of its movement as shown in Figures
the shutter member 31 is retained in its cycle
4 and 10, movement of this shaft being limited
starting position through this movement of the
by a pin |2| on the partition 2 and projecting
cams 46 and 41 ybecause at the start of this move
into a relatively large aperture |22 of the gear
ment the high point of the cam 46 is operative
segment |09. Positioning of the shaft |08 at the
to maintain the shutter member 38 in its cycle 20 opposite end of its movement, as shown in Fig
starting position, see Figure 8, and this shutter
ures l and 2, permits the spring 33 to engage the
shutter member 31 retains the shutter member
31 in its cycle starting position for a considerable
period of this movement before the high vpoint
of the cam 41 takes control of the shutter 31 and
maintains it in its cycle starting position while
the shutter 38 is moved to its extreme open
position.
The film 9 is intermittently fed through the 30
exposure guide 4 in the direction toward the take
up spool 26 to position successive frames of the
film at the exposure aperture 5, in the following
manner.
An elongated film feed shuttle |0| of resilient , l
’
As will be observed, the front face of the upper
guide 36 is disposed in a plane parallel to that of
the exposure guide 4. See Figures 1, 2, 3, '1, 10,
11 and 12. An. elongated plate |23 overlies the
front face of the upper guide and extends parallel
to the feed path of the shuttle |0|, and an elon
gated spring plate |24 overlies the front face of
the plate |23 and also extends parallel to the
feed path of the shuttle. Headed and shouldered
screw studs |25, spaced longitudinally of the feed
path of the shuttle, extend through apertures
through the spring plate |24, the plate |23 and
the upper guide 3B, and are screwthreaded into
the partition 2 to secure the assembly. The ar
material has one end thereof secured, as desig
nated at |02, on the front face of the shutter
member 38 above the exposure aperture 5 and
extends parallel to the pathof movement of the
rangement is such that the spring plate |24 yield
ably urges the plate |23 rearwardly against the
are maintained in closed relation or to the left
in Figure 1. The take-up spool 23, being driven 55
the film.
front surface of the upper guide 36, as shown in
shutter members. See Figures 1, 3 and 1. The 40 Figures 2 and 3, but permits the plate |23 to be
free end of the shuttle is turned rearwardly and
tilted so that the lower edge portion thereof is
forms a ratchet tooth |03 extending through an
moved forwardly as shown in Figure 12.
aperture |04 through the shutter member 38 and
The shuttle is provided, adjacent its toothed
through an elongated transversely extending
end, with an arm terminating in an upwardly
aperture |05 through the partition 2 above _the
extending end |26 disposed in front of the lower
exposure aperture 5 and yieldably urged by the
edge portion of the plate |23 so that this plate
resiliency of the shuttle into engagement with
is engageable with the shuttle in opposition to
usual feed perforations, not shown, of the film
film engaging movement of the shuttle. Thus,
9 in the guide 4 to draw the film from the car
when the lower edge portion of the plate |23 is
tridge 34 and to intermittently feed the nlm in 50 moved forwardly by tilting this plate in opposi
the guide in the >direction of ,the take-up spool
tion to the spring plate‘|24, the shuttle is dis
23 with reciprocation of the shutter member 33,
engaged from the film as shown in Figure 12, the
the film being fed by the shuttle during the stroke
spring moving the plate |23 rearwardly when
of the shutter members 31 and 38 in which they
this plate is released to engage the shuttle with
'
The rear face of the upper guide 36 is provided
with a, channel |21 at the rear of the lower por
with the shuttle, takes up the nlm from the ex
posure guide as it is fed by the shuttle, and only
tion of the plate |23 and extending parallel to
as the film is intermittently fed by the shuttle
the feed path of the shuttle and forming a slide
because of the friction on the film in the exposure
guide with the front face of the partition 2, and
guide 4 and the drag on the film in the'ñlm car 60 a bar |28 is slidably mounted in this slide guide
tridge 34.
for reciprocation parallel to the feed movement
A vertical arm |06 has its lower end pivotally
of the shuttle. This bar is provided with corre
mounted for transverse movement, as designated
sponding cam openings |29 spaced and extend
at |01, on the partition 2. See Figures 1, 2 and 65 ing longitudinally thereof. Balls |3| are engaged
l0. A shaft |08 is journaled on the frame plate
respectively in apertures |32, see Figure 12,
1 and the partition 2, and gear segment |09 is
through the upper guide 36 and spaced longitu
rotatably secured on this shaft between the frame
dinally of the feed path of the shuttle, for move
plate 1 and the front wall of the casing. A bored
ment normal to the plate |23 and are respectively
gear || | is rotatably mounted on a stud ||2 on
engageable with the cam openings |29 and oppo
and projecting forwardly from the frame plate 1 70 sitely with the rear face of the plate |23 and in
and meshes with the gear segment |09 for actu
opposition to the spring plate |24. With posi
ating the shaft |08 with angular movement of the
tioning of the bar |28 at one end of its move
gear |||. A knob H3 is secured on the gear |||
ment, see Figures 1 and 7, the balls |3| are posi
and projects exteriorly of the casing for manipu 75 tioned
rearwardly and extending within the cam
'2,408,549
11
openings |29 and permit the spring plate |24 to
position the plate |23 rearwardly, thus permit
ting the shuttle to engage the iilm in the guide 4.
With positioning of the bar |28 at the other end
of its movement, see Figures 10, l1 and 12, the
balls are positioned by the cam openings |29 out
of the same and forwardly and position the plate
|23 forwardly in opposition to the spring plate
|24, thus disengaging the shuttle from the film
in the guide.
The upper end of the arm |05 is operatively
connected with the bar |28, as designated at |33,
for actuating the bar with pivotal movement of
the arm, it being observed that this arm is actu
ated from the shaft |08, as hereinbefore de
scribed, which controls engagement and disen
gagement of the take-up spool drive clutch, and
the arrangement is such as to provide means for
simultaneously disengaging this clutch and the
film from the shuttle and engaging the same with
obvious convenience in rewinding the exposed
film into the cartridge 34.
The b'ars 84 and 85 are provided with down
wardly projecting detent formations |34 disposed
above the axis of the shaft |08, and the member
|15 is provided with a diametrical slot |35 which
aligns with the detent formations |34, when the
shaft |08 is positioned with the take-up spool
drive clutch engaged and with the shuttle en
12
and out of said abutting relation, two control
means respectively operative on said second 'and
third stop elements for actuating the same re
spectively out of and into said abutting relation,
and a one-way connection operative between 'said
second and third stop elements to position said
second stop element out of said abutting relation
upon positioning of said third stop element in Isaid
abutting relation and to permit positioning of
said second stop element out of said abutting re
lation while said third stop element is out of said
abutting relation.
2. In a device of the character described, the
combination with an exposure shutter including
a revoluble element operative with continued ro
tation thereof to effect successive expo-sure cycles
of the shutter, of a revoluble abutment stop ele
ment operatively connected with said revoluble
shutter element to rotate in timed relation
therewith, a second abutment stop element
positionable in and vout of abutting relation
with said revoluble stop element and operative
to stop said shutter in closed position, a third
abutment stop element positionable in and out of
abutting relation with said revoluble stop element
and operative to stop the shutter- in closed posi
tion in advance oi stoppage of the shutter by »said
second stop element, means yieldably urging said
second and third stop elements respectively into
gaged with the nlm, to permit, by receiving these 30 and out of said abutting relation, a one-way con
detent formations, either of the bars 84 and 85
to be depressed for exposure of the film in the
guide. See Figures 9, 13 and 14. However, when
the shaft |08 _is positioned with the take-up spool
nection operative between said second and third
stop elements to position said second stop element
out of »said abutting relation upon positioning of
said third stop element in said abutting relation
and to permit positioning of said second stop
element out of said abutting relation while said
third stop element is out of said abutting rela
tion, a controlmernber, means yieldably urging
drive clutch disengaged and with the shuttle dis
engaged from the Iilm, the member | I5 serves as
a detent opposing the detent formations |34 and
prevents depression of either of the bars 84 and
85 for exposure, thus preventing re-exposure of
said control member in one direction, and a sec
the film during the rewinding thereof into the 40 ond one-way connection operative between said
cartridge 34.
control member and said second stop element to
position said second stop member out of said
The herein described mechanism which pro
abutting relation with actuation of said control
vides for rewinding the film strip into the film
cartridge 34, see Figure 3, and for preventing
member in the other direction and a second con
operation of the exposure shutter while the mech tp. Ul trol member operatively connected with said third
stop element for actuating the same into said
anism is conditioned for the rewinding operation
is the subject matter of my co-pending applica
abutting relation.
3. In a device of the character described, the
tion for Letters Patent of the United States,
combination with an `exposure shutter inclucing
Serial No_ 651,732, filed March 4, 1946, for im
provement in photographic camera, which is a 50 a revoiuble element operative with continued ro
tation thereof to effect successive exposure cycles
division of this application.
of the shutter, of a revoluble abutment stop ele
While I have thus described my invention, I do
ment operatively connected with said revoluble
not wish to be limited to the precise details de
shutter element to rotate one revoiution with each
scribed, as changes may be readily made without
exposure cycle Vof the shutter and provided with
departing from the spirit of my invention, but
two abutments offset axially with respect to each
having thus described my invention, I claim as
other and disposed in angularly spaced approxi
new and desire to secure by Letters Patent the
following:
1. In a device of the character described, the
combination with an exposure shutter including
a revoluble element operative with continued ro
tation thereof to effect successive exposure cycles
of the shutter. of a revoluble abutment ystop ele
mately diametrically opposite relation, va iirst stop
abutment level' pivotally mounted remote from
` said revoluble stop element on an `axis parallel to
the axis thereof and adapted to be positioned in
and out of abutting relation with only one oi" said
abutments and operative to stop the shutter in
closed position, a second stop abutment lever piv
shutter element to rotate in timed relation there 65 otally mounted coaxially of `said first lever for the
positioning of said second lever in and out of
with, a second abutment kstop element position
abutting relation with only the other of said
able in and out of abutting relation with said
abutments
and operative to stop the shutter in
revoluble stop element and operative to stop the
closed position in advance of stoppage of the
shutter in closed position, a third abutment stop
shutter by said ñrst stop lever7 the abutment en
element positionable in and out of abutting rela
gaging portions of said levers being disposed in
tion with said revoluble stop element and oper
approximately diametrically opposite relation
ative to stop the shutter in closed position in
with respect to said revoluble stop element and
advance of stoppage of the shutter by said sec
oppositely related therewith to be positioned in
ond stop element, means yieldably urging said
second and third stop elements respectively into 75 said abutting relation alternately and respectively
ment operatively connected with said revoluble
I
13
2,408,549
at opposite ends of their movement, a one-way
connection operative between said ñrst and sec
ond levers to position said first lever out of said
abutting relation upon positioning of said Isecond
lever in said abutting relation, spring means urg 5
ing said first lever into said abutting relation, two
control members, spring means yieldably urging
each of said control members in one direction, a
connection operative between one of said control
members and said second lever to actuate said
second lever out of and into said abutting rela
tion respectively with movement of this control
member respectively in its spring urged and other
14
third stop element out of said abutting relation,
and the yieldable urge of said yieldably urging
means on said second stop element overpowering
the yieldable urge of said yieldably urging means
on said third stop element through said one-Way
connection.
,
6. In a device of the character described, the
combination with an exposure shutter including
a revoluble element operative with continuedro
tation thereof to eiïect successive exposure cycles
of the shutter, of a revoluble abutment stop ele
ment operatively connected with said revoluble
shutter element to rotate one revolution with each
direction, and a second one-way connection op
exposure cycle of the shutter, a first abutment
erative between the other of said control members l5 stop lever pivotally mounted remote from said
and said first lever to position said first lever ouil
revoluble stop element on an axis parallel to the
of said abutting relation with actuation of this
control member in the other direction thereof.
4. In a device of the character described, the
axis thereof and adapted to be positioned in and
out of abutting relation with said revoluble stop
element and operative to stop the shutter in closed
combination with an exposure shutter including 20 position, a second abutment stop lever pivotally
a revoluble element operativewith continued ro
mounted coaxially of said first lever for the posi
tation thereof to elïect 'successive exposure cycles
tioning of said second lever in and out of abutting
of the shutter, of a revoluble abutment stop ele
relation with said revoluble stop element and op-I
ment operatively connected with said revoluble
erative to stop the shutter in open position, the
shutter element to rotate in timed relation there
abutment engaging portions of said levers being
with, a second abutment stop element position
disposed in approximately diametrically opposite
able in and out of abutting relation with said
relation
with respect to said revoluble stop ele
revoluble stop element and operative to stop the
ment and oppositely related therewith to be posi
shutter in closed position, a third abutment stop
tioned in said abutting relation alternately and
element positionable in and out of abutting rela
respectively
at opposite ends of their movement,
tion with said revoluble stop element and oper
spring means yieldably urging said iirst and sec
ative to stop the shutter in open position, means
ond levers into said abutting relation, a control
yieldably urging said second and third stop ele
member operative on said iirst lever for actuating
ments into said abutting relation, control means
the same out of said abutting relation, a one-'way
operative on said second stop element for actuat
connection operative between said first and sec
ing the same out of said abutting relation, a one
ond levers to position said second lever out of Isai-d
Way connection operative between said second
abutting relation with positioning of said iirst
and third stop elements to position said third
lever in said abutting relation, releasable means
stop element out of said abutting relation with
for retaining said second lever out of said abutting
positioning of said second stop element in said
4.0 relation, and the yieldable urge of said spring
abutting relation, and releasable means for re
means on said first lever overpowering the yield
taining said third stop element out of said abut
able urge of'said spring means on said second
ting relation, and the yieldable urge of said yield
lever through said one-way connection.
ably urging means on said second stop element
7. In a device of the character described, the
overpowering the yieldable urge of said yieldably
urging means on said third stop element through -“ combination with an exposure shutter including
a revoluble element operative with continued ro
said one-Way connection.
tation thereof to effect successive exposure cycles
5. In a device of the character described, the
of the shutter, of a revoluble abutment stop ele
combination with an exposure shutter including
ment operatively connected with said revoluble
a revoluble element operative with continued ro
tation thereof to effect successive exposure cycles 50 shutter element to rotate in timed relation there
with, a second abutment stop element position
of the shutter, of a revoluble abutment stop ele
able in and out of abutting relation with said
mentoperatively connected with said revoluble
revoluble stop element and operative to stop the
shutter element to rotate in timed relation there
shutter in closed position, a third abutment stop
with, a second abutment stop element position
able in and out of abutting relation with said 55 element positionable in and out of abutting rela
tion with said revoluble stop element and oper
revoluble stop member and operative to 'stop the
ative to stop the shutter in closed position in ad
shutter in closed position, a third abutment stop
vance of stoppage of the shutter by said secon-d
element positionable in and out of abutting rela
stop element, a fourth stop element positionable
tion with said revoluble stop element and opera
tive to stop the shutter in open position, said sec 60 in and out of abutting relation with said revoluble
ond and third elements being mounted for corre
stop element and operative to stop the shutter in
sponding movement into and out of said abutting
open position, means yieldably urging said sec
relation and being oppositely related with said
ond, third and fourth stop elements respectively
revoluble stop element to be positioned in said
into, out of and into said abutting relation, two
abutting relation alternately and respectively at 65 control means respectively operative on said sec
opposite ends of their movement, means yield
ond and third stop elements for actuating thev
ably urging said second and third stop elements
same respectively out of and into said abuttingk
into said abutting relation, control means opera
relation, a one-‘way connection operative between
tive on said second stop element for actuating the
said second and third stop elements to position
same out of said abutting relation, a one-way 70 said second stop element out of said abutting re
connection operative between said 'second and
lation upon positioning of said third stop element
third stop elements to position said third stop
in said abutting relation, a second one-way con
element out of said abutting relation with posi
nection operative between said second and fourth
tioning of said second stop element in said abut
stop elements to position said fourth stop element`>
ting relation, releasable means for retaining said `75 out of said abutting relation upon positioning'of
2,408,549
15
16
said second stop element in said abutting rela
tion, releasable means for retaining said fourth
stop element out of said> abutting relation, and the
ing reciprocation of said shutter members in cor
respondence to provide an exposure opening in
yieldable urge of said yieldably urging means on
prising two rotatory actuating members respec
tively operative on said shutter members, rotatory
said second stop element overpowering the yield
able urge of said yieldably urging means on said
fourth stop element through said second one-way
connection.
8. In a device of the character described, the
combination with an exposure shutter including
a revoluble element operative with continued ro"
tation thereof to effect successive exposure cycles
of the shutter, of a revoluble abutment stop ele
ment operatively connected with said revoluble
shutter element to rotate one revolution with each
exposure cycle of the shutter and provided` with
two stop abutment-s oiîset axially with respect to
each other and disposed in angularly spaced ap
proximately diametrically opposite relation, a
`
but one direction of movement thereof and com
driving means connecting said actuating mem
bers in timed relation, and exposure opening ad
justing means operative on said driving means to
vary the timing of said actuating members and
operative thereby to adjust said exposure opening
increasing to a maximum opening embracing the
entire exposure area covered by the shutter, of a
revoluble abutment stop element operatively con
nected with one of said actuating members to ro
tate in timed relation therewith, a second abut
ment stop element positionable in and out oi
abutting relation with said revoluble stop element
and operative to stop the shutter in closed posi
tion, a third abutment stop element positionable
in and out of abutting relation with said revoluble
stop element and operative to stop the shutter in
open position, disengageable means for simul
ñrst stop abutment lever pivotally mounted re
mote from said revoluble stop element on an axis
parallel to the axis thereof and adapted t-o be
taneously alternately positioning said second and
positioned in and out of abutting relation with
third stop members in said abutting relation, and
only one of said a‘butments and operative to stop
the shutter in closed position, a second stop abut 25 means under the control of said exposure open
ing adjusting means for rendering said disen
ment lever pivotally mounted coaxially lwith `said
gageable means inoperative except at said maxi
said ñrst lever for the positioning of said second
mum exposure opening adjustment of the shutter.
lever in and out of abutting relation with' only
1i). In a device of the character described, the
the other of said abutments and operative to stop
combination with an exposure shutter compris
the shutter in closed position in advance of stop
ing two correspondingly reciprocable exposure
page of the shutter by said first lever, the abut
forming shutter members, actuating means for
ment engaging portions of said levers being dis
effecting reciprocation of said shutter members
posed in approximately diametrically opposite re
in correspondence to provide an exposure open
lation with respect to said revoluble stop element
ing in but one direction of movement thereof and
and oppositely related therewith to be positioned
comprising two rotatory actuating members re
in said abutting relation alternately and respec
spectively operative on said shutter members,
tively at opposite ends of their movement, a third
rotatory driving means connecting said actuating
abutment stop lever pivotally mounted coaxially
of said first lever and adapted to be positioned in
member-5 in timed relation, and exposure open
and out of abutting relation with only said first 40 ing adjusting means operative on said driving
means to vary the timing of said actuating mem
mentioned abutment and operative to stop the
bers and operative thereby to adjust said ex
shutter in open position, the abutment engaging
posure opening increasing to a maximum open
portion of said third lever being disposed approxi
ing embracing the entire exposure area covered
mately diametrically opposite the abutment en
by the shutter, of a revoluble abutment stop ele
gaging portion of said iirst lever with respect to
said revoluble abutment element and related to
said revoluble stop element oppositely with re
ment operatively connected with one of said ac
first, second and third levers respectively into, out
of and into said abutting relation, two control
tuating members to rotate in timed relation
therewith, a second abutment stop element posi
tionable in and out of abutting relation with said
revoluble stop element and operative to stop the
shutter in closed position, a third abutment stop
element positionable in and out of abutting rela
tion with said revoluble stop element and opera
tive to stop the Shutter in open position, means
yieldably urging said second and third stop elc
means respectively operative on said iirst and sec
ments into said abutting relation, a one-way con
ond levers for actuating the same respectively out
of and into said abutting relation, a one-way con
nection operative between said first and second
levers to position said first lever out of saidabut
nection operative between said second and third
stop elements to position said third stop element
out of said abutting relation with positioning of
O said second stop element in lsaid abutting rela
spect to the abutment engaging portion of said
first lever for the positioning of the abutment
portions of said first and third levers in said ,
abutting relation alternately and respectively at
opposite ends of the movement of said first and
third levers, spring means yieldably urging said
ting relation upon positioning said second lever
tion, detent means under the control of said ex
posure opening adjusting means for retaining
said third stop element out of said abutting rela
tion except at said maximum exposure opening
adjustment of the shutter, and the yieldable urge'
of said yieldably urging means on said second stop
element overpowering the yieldable urge of said
yieldably urging‘means on said third stop element
through said one-way connection.
l1. In a device of the character described, the
able urge of said spring means on said third lever 70
through said one-'way connection.
combination with an exposure shutter compris
ing two correspondingly reciprocable exposure
9. In a device of the character described, the»
combination with an exposure shutter comprising.
forming shutter members, actuating means for
effecting reciprocation of said ’shutter members
two correspondingly reciprocable exposure form
ing shutter members, actuating means for effect-~ 75 in` correspondence to provide an exposure open
in said abutting relation, a second one-way con
nection operative between said first and third
levers to position said third lever out of said
abutting relation upon positioning of said first
lever in said abutting relation, releasable means
for retaining said third lever out of said abutting
relation, and the yieldable urge ofv said spring
means on said ñrst lever overpowering the yield
17
2,408,549
18
ing in but one direction of movement thereof and
comprising two rotatory actuating members re
in but one direction of movement thereof and
spectively operative on said shutter members, ro
spectively operative on said shutter members, ro
comprising two rotatory actuating members re
tatory driving means connecting said actuating
tatory driving means connecting said actuating
members in timed relation, and exposure opening Ul members in timed relation, and exposure opening
adjusting means including a movable adjusting
adjusting means including an angularly movable
member operative on said driving means to vary
cam member and operative on said driving means
the timing of said actuating members and oper
to vary the timing of said actuating members and
ative thereby to adjust said exposure opening in
operative thereby to adjust said exposure open
creasing to a maximum opening embracing the 10 ing increasing to a maximum opening embracing
entire exposure area covered by the shutter, or”
the entire exposure area covered by the shutter,
a revoluble abutment stop element operatively
of a revoluble abutment stop element operatively
connected with one of said actuating members to
connected with one of said actuating members to
rotate in timed relation therewith, a second abut
r-otate one revolution with each exposure cycle
ment stop element positionable in and out of
of the shutter, a ñrst abutment 'stop lever piv
abutting relation with said revoluble stop element
otally
mounted remote from said revoluble stop
and operative to stop the shutter in closed posi~
element on an axis parallel to the axis of said
tion, a third abutment stop element positionable
revoluble stop element and adapted to be posi
in and out of abutting relation with said revoluble
tioned in and out or” abutting relation with said
stop element and operative to stop the shutter in
revoluble stop element and operative to stop the
open position, said second and third stop elements
shutter in closed position, a second abutment stop
being mounted for corresponding movement into
lever pivotally mounted coaxially of said iirst
and out of said abutting relation and being op
lever for the positioning of said second lever in
positely related therewith to be positioned in said
and out of abutting relation with said revoluble
abutting relation alternately and respectively at 25 stop element and operative to stop the shutter
opposite ends of their movement, means yield
in open position, the abutment engaging portions
ably urging said second and third stop elements
of said lever-S being disposed in approximately
into said abutting relation, a one-way connection
diametrically opposite relation with respect to
operative between said second and third stop ele
said revoluble stop element and oppositely related
ments to position said third element out of said 30 therewith to be positioned in said abutting rela
abutting relation with positioning of said second
tion alternately and respectively at opposite ends
stop element in said abutting relation, detent
of their movement, spring means yieldably urging
means operative between said adjusting member
said ñrst and second levers into said abutting re
and said third stop element for retaining said
lation, a one-way connection operative between
third stop element out of said abutting relation
said first and second levers to position said sec
except at said maximum exposure opening ad
ond lever out of said abutting relation with posi
justment of the shutter, and the yieldable urge of
tioning of said ñrst lever in said abutting rela
said yieldably urging means on said second stop
tion, a detent element fixed with said cam mem
element overpowering the yieldable urge of said
ber and operative on said second lever for retain
yieldably urging means on said third stop ele 40 ing the same out of said abutting relation except
ment through said one-way connection.
- at said maximum exposure opening adjustment
12. In a device of the character described, the
of the shutter, and the yieldable urge of said
combination with an exposure shutter compris
spring means on said first lever overpowering the
ing two correspondingly reciprocable exposure
yieldable urge of said spring means on said 'sec
forming shutter members, actuating means for 45 ond lever through said one-way connection.
effecting reciprocation of said shutter members in
correspondence to provide an exposure opening
GEORGE A. BRUESKE.
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