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Патент USA US2121933

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June 28, 1938.
w. (SMITH ET AL
MOTION PICTURE CLAW'FEED APPARATUS
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2,121,933
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Filed Oct. 19, 19_36
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“V////// N17.
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2,121,933
Patented June 28, 1938
.11"
opp-ICE ~
; { TiJY-NIITED
2,121,933v
‘ 'MOTION PICTURE CLAW
ismim'ana Jamesrcharles Hall; London,
and James Bernard Barton, Surrcy,.England
Application October 19, 1936, “SerialYNoJ106A80 '
. i
‘
In Great Britain October; 21, 1935 ‘ '
firearms. (CL-58:18.4)’ , ,
Thepresent invention relates to‘ improvements
in cinematographic apparatus, more particu
larly of the type in: which a number of individual
pictures are ‘viewed in‘kinematograph sequence;
5 that is to"say,- at shorttime intervals‘relatively
to
one
another.‘
‘
'
'
1
According to the‘present invention a picture is
projected step byxstep pastaviewingraperture by
means ;of -» one Vo’r‘morei-feed pins vmoving- in a
stantially midway between the limits of movement
of'thelplate IS. The pivotal axis of the crank is
located-a slightly lesser distance below‘ the claws
9ithan»the:abutment 50 ‘when the claws are‘? in
engagement with the strip.
f
r
'
By thisconstruction,‘ it wi‘lll'be seen that when
the" handle I6 is vturned in a clockwise direction,
the crank arm‘i5l will‘engage the open notches
or abutmentsi 50', as shown in'f-ull lines in-Figure 1,
and draw down the claws’ 9 out of engagement‘ with
positively driven from aEhandcrank and during 1 the picture strip. "Further'rotation of ‘the vcrank
part of which by a’ spring, :the' operating energy in the same direction-shifts the plate~i9 against
of which'is stored "in ‘the spring duringIsaid the laction’ of the coiled ends of ‘ the spring arms
to the position shown in'dotte'd' lines in Figure 1‘
positivevdrive' period;
of
' ‘
U I
"The "invention is1 more particularly described wherein the claws 9 are in 'positioni'to re-engage
closed-path, during part of ‘which the ‘pins are
15
v
_
with
reference
which:——.
'
to the accompanying drawing in
'
‘
V
"
",
Figure 1 is a'se'ctional elevation of one‘ form of
construction of device ‘with thecover open.
20' ~Figure
Figure 2V3 is
is a‘a corresponding
sectional elevation
plan view.
of a vfurther
‘
formof
construction“
a
'
'
.
15
thepaper-strip. 'The spring arms tl'llloperatesto,
force the claws 9 into re-engagenientwith'the
‘paper strip and furtherv rotation of? the crank ‘will
bring i-ithe @armr' 5| ‘: thereof out of ~ range of‘ the
‘notches or abutments-EO ‘so'that the stored vup
energy. in the spring armsv I'll will serve to rapidly
displace'the iplate l l9 and claws 1.9=to vtheir ad,
In the construction shown in Figures Land-.2,
vanced positionspas shown in full lines'in Figure
extension '4 on‘ the strip of metalij3 formsa sur- o
mentsiiill‘fromrthe claws P9 is greater'than the
face over which the paper 'strip‘or the ‘like canibe
‘distance of‘the‘nearest=point'on' the arc ofua '
talstrip l of paper :orrthe' like “flexible. material, - LK‘thusadVancing the picture-strip. A buffer '60
rolled vupon itself,i as shown at '2; is-a'dapted ori the'?like maybe employed'to arrestttheadé- _
to‘be received within’ the partly circular‘lreces‘s vancing movementofrtheplate l9. 'It 1will 1 be
in a casing formed by a bent strip ofv metal 3.v fAn seenith'at the spacingaof the notches "or abut
drawn. The paper strip'has pictures 5v disposed
thereonwin spaced relationship-and is provided
circle "swept'out: 1by thev crank. arm ilxto‘the' pic- -
fturesstrip, so that during this‘ rapid forward
along the ‘edges ‘thereof with perforations :16,
movement .of the'claws SrnorreStraint on'this '
into; which said?pins or claws 'Stare adapted‘ to
completely
movement is‘presented
out ‘of engagement
since the‘with
'cranklarm‘
thenotches
5|
extend so'that the strip can be fed past a-window
aperture-'1 ‘in a cover plate 8. Claws or pins 9 are
mounted on a supporting device inthe form of
a plate‘ I 9 which is pivotally mounted on'a spindle
‘5U.,The'movementof
,
~ ‘
'
the ' claws 9' from the position
‘
'
I I., ' The ‘spindle ‘is supported between the ' coiled
="shown indotted vlinesin-Figure 1 to‘ the position
shown in fulllines is preferably braked somewhat
.ends‘ofv a, pair 20f spring arms“ l0,'.the."ends ‘of.
toward the ' end of ' vthis :-‘movement by‘ ‘disposing
40 which en'gage‘the plate‘ I9. zThe opposite 'endsi‘cof
the spring arms I0 are secured to the base I2‘ of
curve ~.whicl‘iiis adapted totfrictionally engage the
the apparatus by'rscrews vl3 or" the like.v Other
spring'means; as for instance-a leaf spring,"may
be employed in place of the spring arms I10. The
plate I9 is provided 'with open notches or abut
ments 50 withwhich an‘ offset‘ crank arm‘ 5| :is
springs'lr‘l, -l'8"are".provide'd on the casing so as
to {afford frictional resistance-to the accidental
return 10f‘ the strippand to‘ furtherafford- resist 45
ance'totthc accidental-shootingforward of "the
the upper portion 4 of the casing in an arcuate
endv‘of the plate 19 during itsmovement. ' Leaf
adaptedto periodically engage; Theorank may
strip ‘so : as ::to 1: thus :"avoi-d tearing ‘thereof at the
be conveniently formed of ‘a strong ‘piece of wire
perforations‘.
extending- through perforations in' the side walls
14, I5--of ‘ the apparatus, and ,providedewith -a
,
I'
,
~ ‘IUW'ill'tbG appreciatedthat there vis ‘no necessity
to ‘reel-:up the. paper strip-upon any bobbin since
it» can be‘rolled- upon itself; and slippedielastically
handle It‘. The notches ‘or 'abutments' '50 open
towardithe claws 19 andzthusl toward thepicture . into-themecess formed by the cylindricalportion
strips It will be, particularly ‘noted ‘that the
pivotal axis of the crank inthe side rwallsiof the
55
apparatus .isv disposed belowthe clawst and sub
oftheicasing
3.
_
,
\
In - thelmodi?ed form‘ .of - the invention shown
iiri-iFigure 3, the: claws’ :32 "which arewadapted to
-
cc
2
2,121,933
engage the picture strip, are connected upon one
end of a lever 33 having a pin and slot connec
tion 34 with a spindle 35 mounted in the sides of
the casing. A similar crank is pivotally mount,
between the picture strip and the nearest point
on an arc swept out thereby is less than the dis
tance between said abutment and the picture
strip, said crank arm being thus engageable with
ed in the side of they casing and has an offset
said abutment when said claws are in engage
crank arm 36 which engages with a similar open
ment with the picture strip at their advanced
notch or abutment on the lever arm.
positions for withdrawing said claws from the pic
ture strip and for shifting said supporting device
Springs 38
and 39 cooperate to normally urge the lever 33
in a direction for engaging and feeding the pic
. ture strip. A gravity snail cam-of rubber or
the like 40 is pivoted to the casing and allows the
strip to be moved past the same, but prevents
any accidental back feeding of the strip.
Operation of the crank in this form of the
invention serves to force the crank arm 36 into '
against the action of said spring means to a retracted'position for re-engagement of said claws 10
with the picture strip.
-
"3. A claw feed apparatus for a motion picture
strip having perforations, comprising a casing,
guide means for the picture strip, claws adapted
to engage the perforations in the picture strip 15
engagement with the notch on the lever ‘so as to ' for advancing the same, a supporting device for
withdraw the claws from engagement with the,
strip and shift the lever rearwardly to a posi-,
tion wherein the springs 38 and 39 cooperate to
urge the claws into engagement with the strip
and to advance the same in its feeding direction.
From the foregoing description, it will be seen
that the present invention provides an apparatus
wherein a crank operates against the action of
spring means for disengaging the claws from the
picture strip and for retracting the claws to a
position for further engagement with the picture
strip, and wherein the spring means serve as the
sole means for effecting re-engagement of the
claws with the picture strip and for advancing
the picture strip, the crank having no part in the
feeding cycle of the operation.
It, is to be clearly understood that minor
changes in the detail of construction and ar
rangement of parts may be made without depart
ingfrom‘the scope 01°v the invention as set forth
in the appended claims.
‘We, declare that what we claim is:—
' .
'
-1. A claw feed apparatus for a motion picture
strip having perforations, comprising guiding
said claws movable between'advanced and re
tracted positions, spring means having one end
thereof secured to said casing and having the
opposite end thereof connected to said support 20
ing device, a pivot for said supporting device car
ried by an intermediate portion of said spring
means, said spring means operating on said sup
porting device to urge said clawsv into engage
ment with the picture strip and to shift said sup
porting device about its pivot from retracted to
advanced positions whereby to feed the picture
strip, means providing an abutment on said sup
porting device, and acrank pivotally mounted
substantially midway between advanced and re 30
tracted positions of said supporting device and
having the pivotal axis thereof disposed between
the picture strip and said pivot and slightly above
said abutment, said crank having an offset crank
arm engageable with said abutment when said
claws are in engagement with the picture strip
Li
at their advanced position for withdrawing said
claws from the picture strip and for shifting said
supporting device against the action of said
spring means to a retracted position for re-en
means for the picture strip, claws adapted to en
gagement of said claws with the picture strip.
gage the perforations in the picture strip for ad
4. A claw feed apparatus for a motion picture
vancing the same, a supporting device for said strip having perforations, comprising a casing,
claws movable between advanced and retracted I guide means for the picture strip, claws adapted
positions,v spring means operating on said sup
to engage the perforations in the picture strip for
porting device for effecting engagement of said advancing the same, a- supporting device for said 45
claws with the picture strip and for advancing claws, a pivot on which said supporting device
the supporting device to feed the picture strip, 7 is mounted, a pair of springs having one end of
means providing an abutment on said supporting
50 devicef‘and a crank pivotally mounted substan
tially midway between‘advanced and retracted
positions of said supporting device and having a
crank arm engageable with said abutment when
said claws are in engagement with the picture
each secured to said casing and having an inter
mediate portion of each coiled around said pivot 50
to support the same, the opposite ends of said
springs being connected to said supporting device
and operating against said supporting device to
shift the same on said pivot from retracted to
strip at their advanced position for withdrawing - advanced positions whereby to feed the picture
said claws from engagement with the picture strip
and‘ for shifting said’ supporting device against
the action of said spring means to a retracted
position for re-engagement of said claws with the
60
picture
strip.‘
‘
‘
'
'
2. A claw feed apparatus for a motion picture
strip having perforations, comprising guide means
for the picture strip, claws adapted to engage the
perforations in the picture strip for advancing the
same, a supporting device for said claws movable
between the advanced and retracted ‘ positions,
spring means'operating on said supporting device
for effecting engagement of said claws with the
picture strip and for ‘advancing said supporting
device and the claws carried thereby to feed the
picture strip, means providing an abutment on
said vsupporting device, a crank pivotally mounted
substantially midway between the advanced and
retracted positions of said'supporting device and
75 having a crank arm so disposed that a distance
strip, the portions of said springs between said
pivot and the casing operating to normally ele
vate said supporting device to maintain said claws
in engagement with the picture strip, means pro
viding a notch on‘said supporting device open
ing toward said claws and disposed above said
pivot, a crank pivotally mounted in said casing
and having the pivotal axis thereof disposed above
said notch and substantiallyv midway between ad
vanced and retracted positions of said claws, and 65
said crank having an offset crank arm engage
able with said notch when said claws are in en
gagement with the picture strip at their advanced
position for withdrawing the claws from the pic
ture strip and for shifting said supporting device
against the action of said spring to a retracted po
sition for re-engagement of said claws with the
picture strip and for disengagement of said crank
arm from said notch.
V V
‘
5. A claw feed apparatus for a motion picture
3
2,121,933
' I strip, having perforations,’ comprising a casing,
guide means for the picture strip, claws adapted
to engagethe perforations in the picture strip for
to an advanced position whereby to feed the pic
ture strip, means providing an abutment. on said
supporting device below said claws, and a crank.
advancing the same, a supporting device having pivotally mounted in said casing and having the
a subs‘tantiallylvertical arm carrying said claws, pivotal axis thereof disposed above said support
ing device and substantially midway between ad
and movable between advanced and retracted po
sitions, a pivot pin mounted in said casing, said. vanced and retracted positions of said claws, said
supporting device having a substantially ‘hori-, crank having an offset crank arm engageable with
zontal slot through whichsaid pivot pin extends,
10 a spring connected to said casing and having the
‘,free end ‘thereof bearing against said supporting
said abutment when said claws are in engage
ment with the picture strip in advanced position 10
for withdrawing the claws fromvthe picture strip
vdevice ‘between said pivot pin and said arm and for shifting said supporting device against
the action of said springs to a retracted position
‘ . whereby to normally urge said claws into engage
ment with the picture strip, a'second spring se-~ for rte-engagement’ of said claws with the .pic
s15
r15 cured to a portion of said casing and connected ture strip.
to ‘said supporting device on‘ the opposite side of '
7 said pivot. pin for shifting‘ said supporting device
and’ the claws carried thereby fron'ra retracted
WILLIAM SMITH.
v
JAMES CHARLES HALL.
i
' JAMES BERNARD BARTODN. .
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