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Патент USA US2134766

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aNov. _l, 1938.
2,134,766
F. scHlEBER ET AL
PHOTOGRAPHIC SHUTTER
Filed May 9, 1938
F119“. 2
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Nov.v l, 1938.
F. SCHIEBER ET AL
2,134,766
PHOTOGRAPHTC SHUTTER
Filed May 9, 1958
Fig.3
5a
25
-
27/4
»
1
2 Sheets-Sheet 2
2,134,766
Patented Nov. 1, 1938
‘UNITED STATES PATENT OFFICE
2,134,786
PHOTOGRAPHIC SHUTTER
Friedrich Schieber, Dresden, and Albert Wolf,
Dresden-Laubegast, Germany, assignors to
Zeiss Ikon Aktiengeeellschaft, Dresden,‘ Ger
niany
Application May 9, 1938, Serial No. 206,746
' In
,
‘
Germany June 10, 1937
(Cl-.9547)
13 Claims.
section a curtain shutter of a somewhat modi?ed
The invention relates to photographic shut
ters and in particular is directed to improvements
in photographic curtain shutters. '
~
leading curtain section which under the action of
‘a spring 2 is wound upon the hollow drum 3 when
the previously tensioned shutter is released.
During the tensioning of the shutter the. tapes or
. Curtain shutters for photographic cameras,
'tive layer to be exposed, are usually equipped with
cords 4 are wound upon sheaves 5, thereby draw
two curtain sections, between which a narrow slot
is formed through which the light passes to the
light ‘sensitive layer during the exposure move
ment of the shutter. It is known to connect the
two curtain sections with each other and also
ing the curtain ‘section I upwardly, past the pic
tubular shaft I6, which in turn rotatably supports
the'drum 6.
’
said drum 8 a roller 9. These rollers 9 are ro
tatable independently of the drum 6 and are
gearing‘ between'the two curta
sections and
between the latter and the shutter adjusting
‘
face directed toward the drum 6 with gear teeth
II forming in eifect a crown wheel. The end 30
.39 position. The novel'differential gearing is de
face of the drum '6 facing said last mentioned
sheave 5 is likewise provided with gear teeth I2
forming another crown wheel. Between said two
signed‘ to e?ect successively during the release of '
the shutter an opening and closing of the cur
V35
'
.
One of the sheaves 5 is provided on the end
winding of the shutter when the curtain sec
tions are in overlapping relation, 1. e. in closed
'
subjected totthe tension of a spring I0 andvhave 25
attached thereto a tape 30 connected with the
following curtain section ‘I.
mechanism, and in which the shutter adjusting
mechanism is also employed.for tensioning or
~
'
Adjacent both-ends of the drum 3, upon which
the leading curtain section I is attached and 20
wound during the exposure movement of the
shutter, is arranged in axial. alinement with the,
It is an object of ‘the present invention to pro
vide a curtain shutter with a n vel differential
~
'
15
other or following curtain section ‘I is wound.
The shaft 8 extends freely rotatable through a
justed, but remains stationary during the normal
operation of, the shutter. In a curtain shutter of
this type the width of the slot canonly be varied
20 .by a manual adjustment, and it is impossible to
obtain an automatic opening and closing‘ of the
I
.
Thesheaves 5 are ?xedly attached adjacent
the slot by. a di?erential ‘gearing. This differen
tain_slot.'
I
the ends of a shaft 8, whose axis of rotation coin
cides with that. of the drum 5 upon which the
" tial gearing is usually provided with a gear to
_ tating only when the width of the slot is to be ad
2
10 -
ture area of the camera indicated in dotted lines
.at P in Fig.1.
with the mechanism for adjusting the width of
slot during the exposure movement.
'
Referring to the Figs. 1 and 2, I designates the ,
also called focal plane shutters, because they
‘are arranged directly in front of the light 'sensi
1
construction.
crown wheels and meshing with the same is
mounted a pinion I3,'_which is rotatable about 35
.
' It is also an object of the invention to provide
a curtain shutter with a differential gearing which I an axis ‘extending at a right angle with respect '
‘not only constitutes the drive of the shutter but , to the common axis of rotation of said sheave 5
and drum 6. The pinion I3 forms in effect a
also a very simple and'dependable coupling be
‘ planetary gear which is rotatably mounted on
‘ ' tween ‘the two curtain sections.
40' 'An'other object ‘or the invention
is a curtain a carrier I4 ?xedly secured by a set-screw I5 or 40
shutter-‘provided with a'drive and coupling means the like, to the adjacent end of the tubular shaft
for'thetwo curtain sections which occupies only ' I6. The other end of the tubular shaft I6 has at
'a very small space, so that the curtain shutter is ‘ tached thereto a bevel gear H which, in a man
especially adapted for photographic cameras of ‘ ner not illustrated in the drawings, is connected
with the shutter winding and adjusting mech 45
the miniature type.
Other objects of our invention will be appar
" rent from the description with reference to the
anism.
accompnaying drawings forming a part of this
speci?cation, but we do not limit ourselves to the
embodiments of the invention herein described
and illustrated, as various forms may be adopted
' within the scope of the claims:
In the drawings:
casing;
‘
Fig‘. 1 is an‘ elevation view of the curtain shut
follows:
-
‘ Fig. 2a is a. section along the line III-III 0
Fig. 2. and
60
'
50.
‘
The operation or. the curtain shutter is as
-
55 ter, partly in section along the line I--I of Fig. 2.
- Fig. 2 is an end view of the curtain shutter, sub
stantially along the line II—II of Fig. 1.
.
The sheave 5, provided on one of its faces with
the gear teeth II, has on its other face a pro
jection I8 which in the upper end position of the
leading‘ curtain section I, i. e. when the shutter
is tensioned, engages a stop IS on the shutter
'
Fig. 3 illustrates in elevation viewand partly in
.
,
.
For tensioning or winding the curtain shutter 55
the bevel gear I‘! is rotated clockwise, thereby
rotating the‘ tubular shaft I5 and the carrier I4
of the planetary gear Iain the same direction.
Since the springs 2 and I0 oppose this winding \
action and act with the same‘ force upon the 60
.
2
9,184,766
lower and upper curtain section i and 1 respec
tively. the moments of torsion acting upon the
planetary gear l3 compensate each other and
both curtain sections l and ‘i, which are'in
superposition, are moved upwardly. When the
modi?ed curtain shutter the upper curtain section
‘I and the tapes 4‘ of the lower curtain section I
are wound upon the drum 6 and the rollers M
respectively. Both curtain sections overlap each
other, so that there is no slot between the same.
projection l8 of the one sheave 5 engages the The lower curtain section i is locked in its upper
stationary stop IS the rotation of the sheaves 5 end position and upon release of the locking
is stopped and the leading curtain section I re
means is wound upon the ‘hollow drum 2 due to
mains stationary during the further winding of the action of the spring 2. The upper curtain
10 the shutter. The planetary gear i3 which until ' section 1 remains for a while in its upper position 10
this time did not rotate between the two crown until the slot between the curtain section has
gears starts now to roll along the stationary gear been formed. During the initial downward move
teeth II and drives the drum 6 with a greater ment of the lower curtain section i the planetary
speed than heretofore, until the curtain section gear 2'! rolls along the gear teeth 22 ot the roller
15 ‘I has reached its upper end position.
During
this ?nal period of the winding operation the
curtain sections l and 'l are moved relatively to
each other until a slot between the same .is
formed of a width according to the selected
adjustment.
9 in the direction of rotation of the drum 2, but 15
with a smaller speed than the latter.
The size of the width of the slot between the
two curtain sections i and ‘I is determined by
the point of time the upper curtain section ‘I is
~ released.
Upon release of the shutter the curtain section
I is pulled downwardly and is wound upon the
drum 3 due to the action of the spring 2. Simul
taneously therewith the tapes 30 of the curtain
26 section ‘i are wound upon the rollers 9 due to
the action of the spring l0. Owing to the same
or approximately the same tension of the springs
2 and ill the slot between the curtain sections l
When the upper curtain section ‘I is 20
released .by the shutter mechanism, it is moved
by the spring I0- in the same direction as the
leading curtain section i.‘
During the simultaneous movement of the cur
tain sections l and T, the planetary gear 22 be 25
tween the crown wheels does not rotate about its
own axis, but acts as a rigid coupling means
between the crown wheels and rotates together
and 1 remains unaltered. This is so, because
30 the planetary gear i3 which is connectedwith
with the same about the axis of the-shaft 25.
When the leading curtain section i has reached 30
the shutter winding mechanism does not rotate
about its own axis, but is bodily moved by its
its lower end position it stops, while the following
curtain section ‘I continues its movement and
gradually closes the slot between the curtain sec
tions. During the time period at which the fol
lowing curtain section 1 moves alone, the plane
tary gear 22 rolls in the same direction
of rotation along the crown wheel 2|, but with
smaller speed than the roller 9.
When the curtain shutter, after having made
an exposure, is again tensioned, both crown 40
wheels 2! and 22 will rotate with the same seed
and the planetary gear 23 does not rotate about
its own axis, but is moved together with the
sleeve 28 about the axis of the shaft 2|. The
curtain sections l and 1 remain securely closed
carrier I4 about the axis of the shaft 8. There
fore, neither the drum 6 nor the sheaves 5 can
35 rotate relatively to each other, but have to
rotate in unison.
'
However, as soon as the leading curtain sec
tion 1 reaches its lower end position,-—the ex
40
posure of the light sensitive layer through the
slot having been accomplished—the planetary
gear 13 starts to rotate about its own axis, but in
reverse direction as during the winding operation
and effects a rotation of the tubular shaft i6
relative to the drum 6. When the following cur
45 tain section ‘I has reached the position illus
trated in the drawings the slot has been closed
and the planetary gear 13 and therewith the
tubular shaft I6 stops.
The employment of the planetary gearing
ll, [3, 12 between the sheave 5 of the leading
curtain section i and the drum 6 of the follow
ing curtain section 1 results in a very compact
construction and in a dependable operation of
the shutter.
Fig. 3 illustrates a modi?ed construction of the
55
curtain shutter, in which the drum 3 of the lead
ing curtain section i is ?xedly connected‘with
the hub 20 of a crown wheel 2|.
One of the
rollers 9, which by the tapes 30- are connected
with the following curtain ‘l, is provided on that
side facing the drum 3 with gear teeth 22 form
ing in effect another crown wheel. A planetary
gear 23 meshes with‘both crown'wheels and it
is rotatably mounted on a bolt 24 which is ra
65 dially secured to a sleeve 26 which is rotatably
mounted on a shaft 25 to which the rollers 9
are secured. The hub 9? of the roller 9 is rotat
ably mounted in a bearing casing 21 attached
to the shutter casing 28. The bearing casing 21
70 surrounds the roller 8 and the planetary gear
during the winding of the shutter, because the
differential gearing prevents a relative move
ment of the two curtain sections, even if the
tensions of the two springs 2 and Ill should vary
somewhat.
In order to prevent with certainty any varia
tion of the adjusted width of the slot, the plane- '
tary gear is mounted on its carrier in such a
manner that its bearing friction is greater than
any stresses which may tend to change the size
of the slot. Fig. 3 discloses by way 0! example,
that a washer 32 may be inserted between the
sleeve 28 and the planetary gear 22 to increase
the bearing ‘friction at this place.
We claim as our invention:
1. In a curtain shutter for photographic
cameras, a curtaincomprising two sections, two
parallel spaced rotatable drums, each having at
tached thereto one 01’ said curtain sections, the
free ends of said curtain sections being adapted
to form between the same an exposure slot, means
for winding one curtain section and unwinding
the other curtain section from their respective
drums, said means including a di?erential gear
ing 22, 23, 2i and also supports rotatably at 21'
ing composed of a planetary gear and two gears
meshing with said planetary gear, one of said two
the hub 20 of the crown wheel 2 I, which as men
gears being coaxially connected with one of said ,
tioned before is ?xedly attached to the drum 3. drums and the other gear being operatively con
' nected'with the other drum, spring means oppos
The latter is rotatable about the shaft 25.
75 In the tensioned or wound condition of this ing the said winding and unwinding of said cur- 7|
3
2,134,766
tain sections from their respective drums, said
spring means rotating said drums in a direction
opposite to that of said winding means during
the exposure movement of the shutter, said plane
tary gear normally forming a rigid coupling mem
ber between said two gears and after movement
of one curtain section into one of its end positions
commences to roll along that gear which is con
nected with said last named curtain section to
effect a continuous rotation of the other gear for
moving the other curtain section relatively to
the ?rst one which has reached its end position,
thereby closing the exposure slot.
connected with one of said drum and the other
gear being operatively connected with the other
drum, and spring means for rotating said drums
in a direction opposite to that of said winding and
adjusting means, said planetary gear‘ei’fecting a
relative movement between said curtain sections
near the'end of the shutter exposure movement
for closing the slot between said curtain sections,
and forming a rigid connection between said two
gears during the initial operation of said winding 10
‘and adjusting means for returning said curtain
sections with the exposure slot closed into opera
tive tensioned position.
,
‘
5. In a curtain shutter for photographic
2. In a curtain shutter for photographic
cameras, a curtain comprising two sections, two cameras, a curtain comprising two sections, two 15
parallelspaced rotatable drums, each having at- _ parallelspaced rotatable drums, each having at
tached thereto one of said curtain sections, the tached thereto one of said curtain sections, the
free ends of said curtain sections being adapted free ends of which are adapted to form between
to form between the same an exposure slot, means the same an exposure slot, a roller rotatably
mounted adjacent 'each end of said drums in 20
20 for winding one curtain section and unwinding
- the other curtain section from their respective
drums, said means including a differential gear
axial alinement therewith, flexible members con- .
necting said rollers with the free end of the cur
tain section attached to the opposed drum, means
for winding and adjusting the shutter, spring
means for rotating said drums upon release of the 25
shutter, and a di?erential ‘gearing for connecting
tively connected with the other drum, springv said drums with each other and with said winding
means opposing the said winding and unwinding and adjusting means, said differential gearing in
of said curtain sections from their respective cluding a planetary gear meshing with two gears,
one of said two gears being attached to one end of 30
30 drums, said spring means rotating said drums in
one of said drums and the other gear being co
ing composed of a planetary gear and two gears
meshing with said planetary gear, one of said
25 two gearsbeing coaxially connected with one of
said drums and the other gear being opera
a direction opposite to that of said winding means
during the exposure movement‘ of the shutter,
said planetary gear after movement of one cur
tain section into one of its end positions corn
mences to rollalong that gear which is con
_ nected with said last named curtain section to
effect a continuous rotation of the other gear
for moving the other curtain section relatively
to the ?rst one which has reached its end posi
40
tion, thereby closing the exposure slot, said
planetary gear during the operation of said wind
ing means forming a rigid coupling member be
tween said two gears for moving said two curtain
sections,with the exposure slot closed into ten~
sioned position.
-3. In a curtain shutter for photographic
cameras, a curtain comprising two sections, two
parallel spaced rotatable drums, each having at
axially connected with the roller mounted adjacent
said last mentioned drum, and means for rotating
said planetary gear about the common axis of said
last mentioned drum and roller, said last named
means being operatively connected with said
winding and adjusting means.
6. In
a
curtain shutter
for photographic
cameras, a curtain comprising a leading section
and a following section forming between the same 40
an adjustable exposure slot, two parallel spaced
rotatable drums, one having one end of said lead
ing curtain section attached thereto and the other
drum having said following curtain section at
tached thereto, a roller rotatably mounted ad
jacent each end of, said drums in axial alinement
therewith, ?exible members connecting the rollers
with the free end‘ of the curtain section attached
to the opposed drum, spring means for rotating
tached thereto one of said curtain sections, the ‘ said drums upon release of the shutter, means
free ends of which‘ are adapted to form between for winding and adjusting the shutter, a differ
the same an exposure slot, means for winding and ential gearing for connecting said drums with
adjusting the shutter, a differential gearing cone each other and with said winding and adjusting
necting said drums with each other and with said means, said di?erential gearing including a plane
winding and adjusting means, said defferential tary gear meshing with two gears, one of said
55
gearing including a planetary gearrneshing with
two gears, one of said two gears being coaxially two gears being attached to the drum of the fol
connected with one of said drums and the other
gear being operatively connected with the other
drum, and spring means for rotating said drums
in a direction opposite to that of said winding and
adjusting means, said planetary gear e?ecting a
relative movement between said curtain sections
near the end of the shutter exposure movement
for‘ closing the slot between said curtain sections.
4. In a curtain shutter for photographic
cameras, a curtain comprising two sections, two
parallel spaced rotatable drums, each having at
lowing curtain section and the other gear being
coaxially connected with one of the rollers
mounted adjacent the ends of said last mentioned
drum, and means‘ for rotating said planetary gear 60
about the axis of the drum having the following
curtain section attached thereto, said last named
means being operatively connected with said
winding-and adjusting means‘.
' 7..In
a curtain
~
Q
‘
shutter‘ for photographic 65
cameras, a curtain comprising two-sections, two
parallel spaced‘rotatable drums, each having at
tached thereto one of said curtain sections, the tached thereto" one of said curtain sections,,the
free ends of which are adapted to form between free‘ends of said curtain sections being adapted ‘
the same an exposure slot, means for winding and to form between‘the same an’ exposure slot, a 70
roller rotatably mounted adjacent each end of
adjusting‘the shutter, a differential gearing con
necting said drums with each other and with said .said drums in axialv aiinement therewith, ?exible
winding and‘ adjusting means, said differential members connecting said rollers with the free end
gearing including a planetary gear meshing with of the curtain section attached to ‘the opposed
two gears, one of said two gears being coaxially drums, means for winding and adjusting the 75
4
2,184,766
shutter, spring means for rotating said drums
upon release of the shutter, a diiferential gearing
for connecting said drums with each other and
with said winding and adjusting means, said dif
10. A curtain shutter as claimed in claim 9,
including a stationary stop, and a projection on
one of the rollers which are connected by said
flexible members with said leading curtain sec
ferential gearing including a planetary gear
meshing with two gears, one being attached on
the leading curtain section upon winding the
_ one end of one of said drums and the other gear
being rotatable with the roller mounted adjacent
and in axial alinement with said last mentioned
10 drum, and a shaft extending axially and rotatably
through said last mentioned-drum and opera
tion, said projection engaging said stop when
shutter reaches its end position, whereupon said
differential gearing becomes effective during the
continued winding operation to adjust the ex
posure slot to the desired width by moving the 10
following curtain section relatively to the leading
tively connected with said winding and adjust»
curtain section.
ing means, said shaft having a member attached
thereto on which said planetary gear is
11. In a curtain shutter for photographic
cameras, a curtain comprising a leading section
and a following section forming between the 15
same an adjustable exposure slot, two parallel
spaced rotatable drums, one having one end of
said leading curtain section attached thereto
and the other drum having said following cur
tain section attached thereto, a roiler'rotatably 20
mounted adjacent each end of said drums in ax
ial alinement therewith, ?exible members con
necting the rollers with the free end of the cur
tain section attached to the opposed drum,
15 rotatably supported.
,
8. In a curtain shutter for photographic cam
eras, a curtain comprising a leading section and
a following section forming between the same
an adjustable exposure slot, two parallel spaced
20 rotatable drums, one having one end of said
leading curtain section attached thereto and the
other drum having said following curtain section
attached thereto, a roller rotatably mounted ad
jacent each end of said drums in axial alinement
25 therewith, ?exible members connecting the roll
ers with the free end of the curtain section at
tached to the opposed drum, spring means for
rotating said drums upon release of the shutter,
means for winding and adjusting the shutter, a
30 differential gearing for connecting said drums
with each other and with said winding and ad
justing means, said differential gearing includ
ing a planetary gear meshing with two gears,
one of said two gears being attached to the drum
v
means for winding and adjusting the shutter, 25
spring means for rotating said drums upon re
lease of the shutter, a differential gearing for
connecting said drums with each other and with
said winding and adjusting means, said differen
tial gearing including a planetary gear mesh 30
ing with two gears, one of said two gears being
fixed to one end of the drum having the leading
curtain section attached thereto and the other
gear being formed of gear teeth arranged on the
gear being rotatabe and coaxial with one of
side of the roller mounted coaxial with said last 35
named drum, said planetary gear being rotat
the rollers mounted adjacent the ends of said
last mentioned drum, and- a shaft extending ax
ably mounted on a gear carrier which is free
ly rotatable about the axis of said last named ‘
35 of the following curtain section andthe other
ially and rotatably through the drum having the
following curtain section attached thereto, said
drum.
-
12. In a curtain shutter for photographic‘ 40
shaft being operatively connected with said cameras, a curtain comprising a leading section
and a following section forming between the
winding and adjusting means and having at
tached thereto a member on which said plan- , same an adjustable exposure slot, two parallel
etary gear is rotatably supported about an axis spaced rotatable drums, one having one end
of said leading curtain section attached thereto 45
45 at a right angle with respect to the axis of said
and the other drum having said following our
shaft.
tain section attached thereto, a roller rotatably
9. In a curtain shutter for photographic cam
eras, a curtain comprising a leading section and mounted adjacent each end of said drums in
a following section forming between the same axial alinement therewith, a shaft extending ax
an adjustable exposure slot, two parallel spaced ially through each drum for rigidly connecting
rotatable drums, one having one end of said a the rollers with each other, means for winding
leading curtain section attached thereto and and adjusting the shutter, spring means for re
the other drum having said following curtain tating said drums upon release of the shutter,
section attached thereto, a roller rotataby a differential gearing for connecting said drums
with each other and with said winding and ad
55 mounted adjacent each end of said drums in ax
justing means, said differential gearing includ
ial alinement therewith, a shaft extending axial
ly through each drum for rigidly connecting the ing a planetary gear meshing with two gears, one
being fixed to one end of the drum having the
rollers with each other, ?exible members con
leading curtain section attached thereto and
necting the rollers with the free end of the cur
60 tain section attached to the opposed drum, spring the other gear being formed of gear teeth ar
means for rotating said drums upon release of ranged on the side of the roller mounted coaxial
the shutter, means for winding and adjusting the with said last named drum, said planetary gear
shutter, a differential gearing for connecting said being rotatably mounted on a gear carrier which
drums with each other and with said winding is positioned between said two gears and is ro
tatabiy supported by the shaft which connects
65 and adjusting means, said differential gearing
including a planetary gear meshing with two the two rollers adjacent the ends of the last
gears, one being attached to the drum of the named drum with each other.
following curtain section and the other gear be
13. A curtain shutter as claimed in claim 12,
ing coaxially connected with one of the rollers including a casing surrounding said differential
gearing, and a bearing formed by said casing
70 mounted adjacent the ends of said last men
for rotatably supporting the drum on which said
tioned drum, and means for rotating said plane
'
tary gear about the axis of the drum having the leading curtain section is attached.
following curtain section attached thereto, said
FRIEDRICH SCHIEBER.
last'named means being operatively connected
ALBERT WOLF.
76 with said winding and adjusting means.
50
50
55
60
65
70
76
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