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Патент USA US2404291

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_. July16, 1946.
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~ D. G.YHUNTER
2,404,291
ROLL-FILM WINDING. MECHANISM
Filed Apfil 12, 1944
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3 Sheets-Sheet 1
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Inventor
'Ilou, (“Gd/n Minin
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July 16, 1946. ‘
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D_ G_ HUN'fER
2,404,291
ROLL-FILM WINDING MECHANISM
Filed April 12, 1944
3 Sheets-Sheet 2‘
July-16, 1946. -
‘ID. G. HUNTER
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I 2,404,291
ROLL-FILM'WINDING MECHANISM
Filed April 12, 1944
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5 Sheets—Sheet '3
£764,
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Inventor
2007149 GET/021 #01171?‘
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2,404,291
Patented July 16, 1946
UNITED STATES PATENTOFFICE. '
ROLL-FILM WINDING MECHANISM
Douglas Gordon Hunter, London, England, as
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signor to Barnet Ensign Limited
Application April 12, 1944, ‘Serial No. 530,607
In Great Britain May 4, 1943 '
9 Claims.
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1' 2
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Inrthe larger cameras it ,is not convenient for
the full feed necessary for the ?lm to be e?ected
This invention relates to rolle?lm photographic
cameras and in particular to ?lm winding mech
by one rotation or less of the winding knob and
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to deal with this the stop member is formed in
In miniature cameras, owing to the small size
two. or more interengaging ‘parts with lost mo
of the ?lm, it is necessary to ensure that the ?lm
is wound with great precision. This is some
tion between them and in that event, on turning
times effected by arranging the ?lm winding
the winding knob, the part directly connected
with it is ?rst rotated until it takes uptthewlost
mechanism to cooperate with the shutter wind
ing knob ‘so that the ?lm is wound during the V motion between it and the one or moreother;
winding up of the shutter. In larger cameras, 10 parts whereupon the next part is driven-and so
on until ?nally the knob cannot be turned any
however, it is usual to provide an inspection win
further" owing to the engagement with a ?xed
dow and to provide the back cover of the ?lm
stop. A convenient arrangement consists of a
with indicating marks so that the ?lm is wound
stop member consisting of two coaxial parts, the
until the appropriate mark shows through the
anism for such cameras.
window.
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15 one connected to the winding knob having a ra
dial pin engaging in a peripheral recess in the
second‘ or inner part, and the latter having an
The object of the present invention is to pro
vide a ?lm winding mechanism with an. auto
matic stop so that the roll-?lm may be wound
with accuracy without the need of an inspection
arc-shaped grooveinto which astop pin‘ on the
camera body projects. In such a case there.
window so that the winding becomes practically 20 turning spring may be a coiled spring-anchored
at one end to the said radial pin and at the other
fool-proof and, if desired, the ?lm may be wound
while the camera is being set up and focussed.
end to a part ?xed to the camera body.
According to the present invention the ?lm
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The invention will now be more fully described.
with reference to the accompanying drawings, in_
which:
winding mechanism for a roll-?lm camera is pro
vided in the usual way with a winding knob by
means of which the ?lm spool isturned but it is
Figure 1 is a side view of a camera in the closed
arranged for a stop member to be clutched to the
winding» knob so as to be driven by the latter
position with the novel roll-?lm winding mech
against the action of a spring and in this way
the amount of rotation of the knob is limited to ,
the amount required for Winding a fresh expo- '
Figure 2 is an elevation of the winding mech
anism to an enlarged scale with parts of the
casing removed to show certain of the internal
sure into position while the user of the camera
elements;
is able to operate means to unclutch the stop
member from the winding knob so that the stop
membermay be returned by the spring where
upon the winding mechanism is reset for a fresh
operation.- It is convenient to perform therun
clutching by axial depression or sliding of the
winding knob itself and to that end the stop
anism embodied init;
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Figure 3 is an axial section taken on the line
III—-IlI in Figure 2;
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Figure 4 is an elevation of the second or inner
part of the stop member;
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Figures 5 to 7 are transverse sections of certain
parts of the winding knob and stop memberto
show the relative movements; while
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Fig. 8 is an elevation of a slightly modi?ed
member is made to turn about the latter until it 40
form of the device shown to cooperate with the
is brought into engagement with a stationary
stop ?xed to the camera body. The return of
the stop member when it'is ‘unclutched may be
eifected‘by a coiled wire spring anchored between
the stop member and the ?xed. casing of the
mechanism so that during the winding of a ?lm
‘the spring is wound up by the rotation of the
stop member.
A convenient method of- clutching the stop
shutter release button.
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In Figures 1 to 3 details of the winding mech
anism are shown with the winding knob l mount
ed in the lower part of the side of the camera
body 2. The winding knob l is prevented from
sliding off the ?lm winding. stem 4 by the head
of a set screw 3 which overlaps the recessed base
35 of the winding knob I. The winding knob .l
member tothe winding knob; consists in provid 50 is hollow, as seen in Figure 3, and is provided
mally engaged by one ‘or ‘more teeth projecting
with a knurled rim 5 which has also a' depending
portion 6. In the form illustrated three triangu
from the other part and so arranged that on
lar clutch teeth 1 ' are provided extending in
ing one of those parts with a toothed ring nor
wardly from the depending 171m 6 of the winding
the winding knob sliding axially, the teeth are
disengaged to unclutch the stop member.
55 knob I‘. _ Three teeth are provided to prevent side
2,404,291
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play but naturally any other number may be em
.ployed and in certain cases one would be su?ie.
cient; 'These teeth normally engage an exter-‘
nally-toothed ring 8 formed on the outer part 9
of the stop member. The winding knob I is arev 5
ranged to be depressed and can slide axially, that
is, to the right in Figure 3. To-permit this and
to provide a driving or .key connection between
the winding knob l ,and- the ?lm winding stem
4, the base 35 of the recessed portion of the wind 10
4
with the left-hand‘end of ‘the groove I9 in the
inner sleeve I6. In passing from Figure 6 to Fig
ure '7, however, the sleeve I6 has turned until the
right-hand end 25 of the groove I9 has reached
the ?xed pin ZI whereupon the ?lm has been
wound exactly the correct amount.
As already pointed out, during this turning of 5
the winding knob I the coiled spring 22 has been
wound .up. If now the winding knob I is de
pressed against the action of the plate-spring II
ing knob I isformed with two inwardly extend-l
- the two sleeves 9, I5, forming the stop member
are unclutched from the winding knob I in the
tongues engage in opposite slotsintheouter end ' manner'alrea‘dy. described and are therefore free
of the ?lm winding stem v‘I whichjslots .extend
to. be turned back by the spring 22 as the latter
suf?‘cientlyi along the-winding stemIA ‘to permit‘ .15 unwinds and'then‘ when the winding knob Iis
the necessary axial inward vmovement of the ' .a'gain;released the teeth 'I'engage the ring 8,
ing lugs or tongues 36, best seen in Fig. 2; these ,
f- winding knob I. It will be notedthat the. toothed.‘ l. " the parts ;are re-set and the knob I is ready to
ring 8 is of limited depth so that during .the saidv » . wind the?lm for yet another exposure.
axial movement of the. knob I the teeth'l can"
In order to allow an 'exposed spool of ?lm 26
‘ leave the ring 8 with the resultthat the part 9 20 to be removed ,anda fresh.’ spool .to .be inserted,
v of the stop member is 'unclutched from’ the vknob
it. is necessary _to withdraw, ribsrlllfrom. the
I.v Normally, however, the winding knob I* is '
slot in the end of the spooljilli;v These ribs 21:
held-in’ the clutched position by'theprongs I 0
of a ‘plate-spring II/riveted to the camerarbody,
are formed on a part 28_screwed into. thevinner
end of the windingstemd, asshown-in Figure 3.
Normally, however, thestemll and the'ribs 2.‘!
' 2 at I2 (Figures 1 to 3) ;‘ these prongs It! engage
" undera~shoulder I3 of the knob _I and areiset
cannot be retractedbecause, a pivoted catch plate
25 (Figures 1 to 3)_[-is held in engagement .with
a peripheral groove SILinthe-winding stem34.by
as seen in ‘Figure 3 to keep the teeth "I in en- "
gagement with the toothed ring 8. Bythis ar
rangement simple pressure on'the'winding' knob '
I unclutches the part 9 from it.
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a coiled tension springBI. [As can‘lbe seen'fir‘om
Figures 1 ,and.2, however, the .end of the-catch
n.
' ,The outer part 9-of the stop'memberhas a'pin
1 r or, peg III extending radially inwards intov 'a
plate 29 extends slightlyithrough a s'lotinthe '
camerabody .2 andcan be. retracted by the thumb
of onehand whereuponthe winding knob I- can‘be
recess 0:- cutaway part I5 of an innersleeve I6
which forms the second _part_oi the rotary stop 7
pulled out by the other hand su?iciently to release
the exposed spool 26. This .spool canberemoved
member. >This=recess I5 subtends an angle of
about-‘225° at the axis of the winding spindle'll.
and .a “fresh spool inserted in its place ‘when
the winding knob I is pushed in for they ribs 21
to engage the fresh spool. The parts are'then
The ends of the recess are shown atI'I in Fig
1' ures72, to 7. For the sake ‘of clearness the extent
of<this cut-away part I5 is shown‘shaded in_'Fig
ures 53119 '7 ‘while in Figure 4 the external shape 40
ready for winding the fresh .spool' 0f. ?lm.
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In Figure 8 a slight modification is-shown. -~'I’he
of the inner sleeve I6 is :‘shown clearly. There
is, therefore, 7a lost motion of nearly 225° be
tween-the parts 9 and. I6 of, the stop member.
shutter operating buttonr32.-isj shown by’ the side
The inner sleeveIG has a disc-shaped base I8,
seen clearly in Figures 3 and 4, which rests ‘on
a?at ‘plate 20 recessed into and secured tothe
camera body 2. A stop in the form of a pin. 2|
independent, in Figure -8 the'shutter button =32‘is
shown with a pair or arms 33 _'Whl0h engage in
of the winding knob I. as in :Figure -1, but whereas
in Figure .lvthese two parts are shown to be '
a groove 34 in the winding knob_~,I so’ that when
the .latter is depressed and slides axially» it :also
projects intov the arc-shaped groove I9. .Ar'coiled
.causesthe shutter release button 32 to1be oper
, “torsion-spring 22 has its outer end hooked'over
atedein order-tomake the exposure. Thisaction
the radial pin Mto engage a groove 23 therein, 50 is satisfactory since 'normally’the spring “is
while its inner end projects into a slot 24 in a ‘
stronger than thereturn ‘spring'for the button
boss upstanding from the ?xed plate 20 ‘so that if
32.. The arrangement shown in Figure 8 ensures
1 the winding knob 'I is‘ turned. counterclockwise,
that an exposure is made-before the winding
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as seen in Figures 2 and 5 to 7,’the'spring ‘22. is
mechanism can be reset. -;It does not ensure that
wound up.
55 two exposures shall niotbe-made. on-a-single length _
In operation, during the said rotation ‘of’ the .
ofv ?lm but it does prevent the ?lm being iwound
v winding knobI, the latter through the teeth ‘I
until the length of ‘?lm last wound has been
and toothed ‘ring 8 rotates the outer sleeve ,9
~ exposed.
J . until the pin I4 of the latter encounters the inner
~
What I claim is:
sleeveIB at theend .I'Iiof the cut-away part ‘I5.
In Figure 5 the normal position when these parts
1‘ are at rest .is shown .and. the movementijust
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1. A'i?lm-winding mechanism .for'a: ro1l+?lm
photographic cameraf comprising in combination,
a ?lm gs'pool stém‘journalled' within the .eamera
body, a winding knob in driving connection with
' I5, shown on the right of. Figures 5 and .6, and 65 said stem-and protruding from the camera'bo'dy,
a ‘stop member movably mounted on the camera
4 has .travelled round with the outer sleeve ,9 until I
' referred to is. shown ‘in/Figure 6 in which the
pin I4 has left the end 11 of the cut-away’ part
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body, a spring connected to said stopwmemberffior
i‘injFigure
after turning .:through nearly 225°,
it has‘reache'd thenend Il of-the ciiteaway. part ,.
15. shown on the‘lleft of Figures 5 and 6. .Then ,
on ‘further rotation. of the winding knob I the
biasing same to a normal position, aclutch' opera- "
tively connecting said. winding ,1{l’10b&~.tO.Said stop
_member, a ?xed ‘ stop .cOacting with a said .stop
1 pin ‘I4 drives the Iinnersleeve I6 which continues
to rotate untilit is stopped'by’th'e end of the
: .groovel?lme'etingthe ?xed stop pin 2|. This
member for limitingtherotation ofsaid winding
knob. and means permitting manualdisengage
' ment of said clutch thereby enabling- the userto
‘ movement isshown fin .Figuresl? and 7‘ for in ,
, ,Figure 6 the ?xed stop pin 2| is shown in contact 75
knob.
disconnect
,
said stop member
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,fromgsaid
.‘nding ,
2,404,291
5
2. A ?lm-winding mechanism for a roll-?lm
photographic camera comprising in combination,
a ?lm spool stem journalled within the camera
body, a winding knob in driving connection with
said stem and protruding from the camera body,
a stop member movably mounted on the camera
6
wire spring anchored to the camera body and to
said rotary stop member for biasing the latter to.
a normal position of rotation, interengaging teeth
integral respectively with the inside of said de
pending rim and the outside of said stop member
for clutching said stop member to said winding
knob and a ?xed stop coacting with said stop
body, a spring connected to'said stop member for
member for limiting the rotation of said stop
biasing same to a normal position, interengaging
member and said winding knob, said winding
teeth integral with said winding knob and said
stop member for clutching said stop member to 10 knob being axially slidable manually to permit
disengagement of said teeth for disconnecting
said winding knob and a ?xed stop coacting with
said rotary stop member from said winding knob.
said stop member for limiting the rotation of
7. A ?lm-winding mechanism for a roll-?lm
said Winding knob, said winding knob being
photographic camera comprising in combination,
axially slidable manually to permitdisengagement
of said teeth for disconnecting said stop member 15 a ?lm spool stem journalled within the camera
body, a winding knob in driving connection with
from said winding knob.
said stem, protruding fromthe camera body and
3. A ?lm-winding mechanism for a roll-?lm
_formed with 9. depending peripheral rim pre
photographic camera comprising in combination,
senting a tooth projecting radially inwards, a
a ?lm spool stem journalled within the camera
body, a winding knob in driving connection with 20 stop member mounted within said depending rim
for rotation coaxially with said winding knob and
said stem and protruding from the camera body,
formed with a peripheral toothed ring engaged by
a stop member mounted for rotation coaxially
said tooth, a spring connected to said stop mem
with said winding knob, a spring connected to
said stop member for biasing same to a normal
ber for biasing same to a normal position of ro
position of rotation, a clutch operatively connect 25 tation and a ?xed stop coacting with said stop
member for limiting the rotation of said stop
ing said winding knob to said stop member, a
member and said winding knob, said winding
?xed stop coacting with said stop member for
knob being axially slidable manually for disen
limiting the rotation of said winding knob and
gaging said tooth from said toothed ring for dis
means permitting manual disengagement of said
connecting said rotary stop member from said
clutch thereby enabling the user to disconnect
winding knob.
said stop member from said winding knob.
8. A ?lm-winding mechanism for a roll-?lmv
4. A ?lm-winding mechanism for a roll-?lm
photographic camera comprising'in combination,
photographic camera comprising in combination,
a ?lm spool stem journalled within the camera
a ?lm spool stem journalled within the camera
body, a winding knob in driving connection with 35 body, a winding knob in driving connection with
said stem and protruding from the camera body,
said stem, protruding from the camera body and
a stop member comprising ?rst and second parts
formed with a depending peripheral rim, a stop
movably mounted in the camera body with lost‘
member mounted within said depending rim for
motion between said parts, a clutch operatively
rotation coaxially with said winding knob, a
spring connected to said stop member for biasing 40 connecting said winding knob to said ?rst part
'of said stop member, a ?xed stop coacting with
said second part of said stop member for limit
ing the rotation of said winding knob, a spring
side of said depending rim and the outside of said
connected to said ?rst part of said stop member
stop member for clutching said stop member to
said winding knob and a ?xed stop coacting with 45 foribiasing same to a normal position and for
taking up the lost-motion between the parts
said stop member for limiting the rotation of said
thereof and means permitting manual disengage
stop member and said winding knob, said winding
ment of said clutch and thereby freeing said stop.
knob being axially slidable manually to permit
vmember from said winding knob to permit said
disengagement of said teeth for disconnecting
said rotary stop member from said winding knob. 50 spring to cause said stop member to move to the
normal position.
5. A ?lm-winding mechanism for a roll-?lm
9. A ?lm-winding mechanism for a roll-?lm
photographic camera comprising in combination,
photographic camera comprising in combination,
a ?lm spool stem journalled within the camera
a ?lm spool stem journalled within the camera
body, a winding knob in driving connection with
said stem and protruding from the camera body, 55 body, a winding knob in driving connection with
said stem, protruding from the camera body and‘
a stop member mounted for rotation coaxially
formed with a depending peripheral rim, an
with said winding knob, a coiled wire spring an
outer sleeve mounted within said depending rim
chored to the camera body and to said rotary
same to a normal position of rotation, inter
engaging teeth integral respectively with the in
for rotation coaxially with said winding knob, a '
stop member for biasing the latter to a normal
position of rotation, a clutch operatively con 60 radial pin extending inwards from said sleeve, an
inner sleeve mounted within said outer sleeve for
necting said winding knob to said stop member,
rotation coaxially with said winding knob, formed '
a ?xed stop coacting with said stop member for
with a peripheral recess engaged bysaid radial
limiting the rotation of said winding knob and.‘
pin and with an arcuate groove in one end face
means permitting manual disengagement of said
thereof, a spring anchored to the camera body‘at
clutch thereby enabling the user to disconnect
oneend and to said radial pin at the other end
said stop member from said winding knob.
for biasing said outer and inner sleeves to 2. nor-_
6. \A ?lm-winding mechanism for a roll-?lm ‘
mal position of rotation, interengaging teeth in
photographic camera comprising in combination,
tegral respectively with the inside of said de
a ?lm spool stem journalled within the camera
body, a winding knob in driving connection with 70 pending rim and the outside of said outer sleeve
for clutching said outer sleeve to said winding
said stem, protruding from the camera body and
knob and a ?xed stop pin projecting axially from
formed with 2. depending peripheral rim, a stop
the camera body to engage said arcuate groove.
member mounted within said depending rim for
rotation coaxially with said winding knob, a coiled‘
DOUGLAS GORDON HUNTER,
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