close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2124322

код для вставки
July 19, 1938.
2,124,322’
'A. w. TONDREAU
FILM PULL-DOWN MECHANISM
Filed Nov. 22, 1935
5 Sheets-Sheet l
v
INVENTOR.
‘
ALBEIPT W. TONDQEAU
BY
ATTORNEY.
'
July 19, 1938.
_
A‘ w_ TQNDREAU
2,124,322
FILM PULL-DOWN MECHAN-I SM
Filed Nov. 22, 1955
Q
1;
\.A
\
90
'
5 Sheets-Sheet 2
INVENTOR.
. ALBERT W. TONDPEAU
J
_
ATTORNEY.
July 19, 1938.
A, w_ TQNDREAU
2,124,322
FILM PULL-DOWN MECHANISM‘
Filed MN. 22, 1955
5 Sheets-Sheet 4
38
PILOT P/Ns Our
0
51534727”
HP 225
'
-
'
_
CZAWS MOVING
‘
_
P/LoT P/Ns /N
CLAWS Movws Dow”
F151 D
IN VEN TOR.
ALBEe-r W 7_ONDP£AU BY
'
A TTORNEY
July 19, 1 938.
2,124,322
A. w. TONDREAU
FILM PULL-DOWN MECHANISM
Filed Nov. 22, 1935
5 Sheets-Sheet 5
'
INVENTOR.
ALaL-m- W Touommu
BY
A TTORNEY
Patented July 19, ‘1938
A " 2,124,322,
UNITED STATES . PATENT
.
z,1z4.a2z
OFFICE
’
mm PULL-DOWN nmcmmrsm
Calif., assignor
Albert W. Tondreau, Glendale,
to Warner Bros. Pictures, Inc., New York, N. Y.,
a corporation of Delaware .
Application November 22', 1935, Serial No. 51,111
13 Claims. (Cl. 88_—-18.4)
This invention relates to intermittent move
ment mechanisms, and particularly to intermit
. tent’ ?lm movements for moving a motion picture
?lm in a step by step motion past the picture gate
of a motion picture camera.
-
The movement comprising the present inven
tion is of the general type in which a pair of
claws operate intermittently to engage and pull
down the ?lm before the photographing aperture.
action of such spring devices. Furthermore, this
sawing action of either the pilot pins or the pull
down claws causes considerable wear in both the
?lm perforations and the member itself as well as
tending to produce vibration and noise.
5
One object of the present invention is to min
imize the sawing action of the claws and/or pilot
pins while in engagement with the ?lm perfora
tions.
-
,
‘
This is accomplished by providing a rocking
10 A pair of pilot or register pins, interconnected cam to produce an in and out’ movement of» the
with the claws, operate to” engage and hold the I claws and/or pilot plus. .The- cam is intercon
?lm in a steady position during the return stroke nected with the driving mechanism of the pull
of the claws. It is of extreme importance'that down mechanism and is so constructed that a
the ?lm, while it is being exposed, be held per
fectly motionless to prevent blurring of the im
age. Pilot or registering pins have been usedfor
some time to attain this result by engaging the
cam follower operating the ?lm engageable mem 15
ber, i. e. claws and/or pilot pins, engages an in-.
active portion of the cam while the member is in
engagement with the ?lm perforations.
Other features of the invention are the provi- _
sion of a mechanism vwhichis simple in construc 20
tion, capable of high speed, reversible in direc
20 these pins prevent longitudinal movement of the
?lm, all prior arrangements of which I am aware. ‘ tion, and that has a fast "pull down" and a long
and which include rotating cams or eccentrics to period of "dwell."
,
.
,
operate the pilot pins, produce a small lengthwise
movement .of the pins transversely of the ?lm
while in engagement with the ?lm; that is, while
the ?lm is being
In movements employ
pilot plus, this “in
ing eccentrics for operating the is
and out” movement of the pins practically oon- .
tinuous while in movements employing rotating
pilot pins may remain
30 cams for this purpose, the the
time which is usu
stationary for a portion of
time.
ally about on -half of the total exposure
During the .
portion of the exposure
are being moved longitué
time, however. the pins
35 dinaliy. Duetothefact that the pilot pins must
' The above object and features of the invention
will be more clearly understood from the follow-‘ 25
ing detailed description, reference being had to
the accompanying drawings in which:
Fig. 1 is a side elevational view of the pull down
mechanism embodying my invention in which the
parts are shown as being in position where the 30
?lm moving claws are in about the middle of their
'
?lm movement. .
- Fig. 2 is a 'vlewsim?ar to that of Fig. l, partly
broken off, showing the ?lm moving claws in
‘
about the middle-of their return movement. '
Fig. 3 is a sectional elevation view taken along
the line H of Fig. 1.
be a very snug fit in the perforations ofv the ?lm,
in order to hold the ?lm perfectly motionless lon
g'itudinaiiy thereof during the exposure time. there
is generally considerable friction between the
40 pins and the ?lm. Especially is this true where
'the?lmhasshrunkorotherwisebeendistorted
_ in form or where the intermittent movement has
It will therefore be
expanded due to bee
.
seen that the sawing action of the pilot pins in
45 and out. while ethe ?lm. tends to move
the film back and forth along with the pins, thus
it b81118 understood
‘
Fig. 4 is a sectional plan view taken along the
line 4-4 of Fig. l.
'
-
. mg. 5 is a sectional view through the shuttle
fork and is taken along the line 5-5 of Fig. 1.
Fig. 6 is asectional elevation view of the rear
guide plate taken along line H of Fig. 2.
Fig. 'l is a plan sectional view of the locking ‘5
means for holding the aperture plate in closed or
threading position and is taken along the line ‘|-.-1
of Fig. 2.
'
Fig. 8 is a transverse section partly broken off
of the ?exible ?ll-Wheel.
pressed
suchaspressurepads.etc.,
havebeenusedtoholdthe?lmagainstoneof-its
thefrictionbetweentbe?lmand
'theperforationsmaybcsogreatthatthe?lm
s5 wlllbcpmbedforwardandbackwardagainstthe
'
Pigs. 9-11 are
tic views showing the
pull down mechanism in various positions.
Fig. 12is a
form of the invention.
'll'igs. 18 and.“ are
'
50
' ‘
ticviewof amodi?ed
’
'
.
tic-views of a ll
2
2,124,322
further modi?cation showing the pull down mech
anism in different positions.
More particularly describing the invention as
herein illustrated, reference is had to Fig. 1
wherein the ?lm I is drawn by a feed sprocket 2
and‘passed into a free loop 3 from whence it
projecting on either side thereof which are slid
ably carried within bearings 48 and 48’. Bear
ings 48 and 48' are secured to the front of the
wall 8 by means of screws 4| and held in align- '
ment by means of dowel pins 42 and 42’. Re 5
newable shims or shoes 48 and 48' (Fig. 4) are
provided on the front and back inner edges of
guide plate 5 comprising the ?lm guiding means.‘ the cam follower and are held ‘therein by screws
Both the aperture plate 4 and the guide plate I 44 and 44'. A link member 48 (Figs. 1 and 3) ‘is
are mounted upon a rear wall 8 at; right angles pivoted intermediate its ends upon a boss 48 pro 10
thereto. The rear wall 8 which supports the pull jecting fromthe front edge of the wall 8 by means
down mechanism proper is adapted to be mounted of a screw 41. The upper end of the link 45 is
in any suitable manner, such as by screws ‘I, v siidably carried within a rocking bearing 48
within the casing of 'a motion picture camera mounted on a boss 48’ on the forward edge of
(not shown) and thus operate in conjunction the cam follower 88. The lower end of the link 15
passes between an aperture plate 4 and a rear
- with a suitable shutter mechanism and with a
suitable arrangement of lenses as is apparent to
one familiar with the art. The ?lm engaging
claws 8 and 8 (Fig. 5) have their ends formed so
20 as to engage the sprocket hole perforations pro
vided along either side of the ?lm I and are at
tached by means of nuts l8 and H to the cross
head i2 of a ?lm advancing member or shuttle
fork l8. The claws 8 and 8 operate within elon
25 gated slots l4 and I5 (Fig. 6) provided in the rear
48 is siidably carried within a rocking bearing
48 which projects through an elongated opening
88 in a cover plate 8| provided at the forward
edge of the bearing 82 and is secured to the shank
8| of the shuttle fork l8 as shown at 82 (Fig. 5). v20
Cover plate 8| is secured to~the forward end of
the bearing 82 by means of screws such as 58
(Figs. 4 and 6).
-
Register pins 84 and 88 are provided above the
claws 8 and 8 and are adapted to slide within 25
guide plate 5 and also extend a short distance bearings “and 81 formed integrally with the
into similar and registering slots I 8 and I1
rear guide wall 8.‘ The ends of the pins “and 58
(Figs. 1 and 5) provided in the aperture plate 4. .are of the same shape and size as the ends of
The claw or shuttle fork actuating mechanism the claws 8 and 8 and are adapted to engage and
30 is divided into two parts, one for e?’ecting the
hold the ?lm in position before the ?lm aperture 30
up and down motion of the claws 8 and 8 and the
“I (Fig. l) of the aperture plate 4 while the
other for effecting the in and out motion of the claws 8 and 8 are returning on their upward
same claws at the limits of their up and down stroke. Pins 84 and 88 are secured at their rear
motion. Both of these movements are actuated ends by means of nuts 88 to a cross head 88
35 by an eccentric disk l8 having a crank pin l8
which, in turn, is secured by a screw 88' to the
mounted thereon.
forward end of a link member 8|. The member
A connecting rod 28 having one end journaled 8| is secured at its rear end to a boss 82 (Fig. 4)
on the crank pin I9 is slidable within an elongated provided on the cam follower 88 by means of a
bearing portion 2|’ provided on a rocking bearing screw 88. Thus it will be seen that forward mo
member 2| as clearly shown in Fig. 5. The mem
tion of the cam follower" will effect a similar
ber 2| has an enlarged bearing portion 22 which motion to the register'pins 84 and 88 and at the 40
is joumaled within the wall 8. The outer end ‘same moment will effect a rearward motion
of the member 2| is journaled within a bushing 23 through the link 48 to the claws 8 and 8 and
secured within a bracket 24 which is in ‘turn,
A
pair of washers 25 and 25' on either end of the
45 secured by screws 24' (Fig. 6) to the wall 8.
vice versa.
'
.
'
Referring now to Fig. 5, the crank pin |8 of the 45
eccentric disk I8 is lubricated by means of lubri- bushing 28 engage a shoulder 21 on the member - cant impregnated wicks 84 and 88 provided in
2| and a nut 28 respectively, the nut 28 being
mounted upon a threaded end portion 28 of the
50 member 2| to prevent axial movement of the
member. The forward end of the member 2|
is provided with an elongated bearing portion 88
longitudinally extending apertures 88 and 81 pro
vided within the ends of the connecting rods 28
and 82. Springs 88 and 88 force the wicks 84 and
88 into engagement with crank pin l8. Fibrous
washers ‘l8 and ‘II also assist in lubricating the
to slidably receive a rectangular shank 8| of crank pin is. The rocking bearing member 2| is
the shuttle fork l8. Thus it will be seen that the similarly provided with a longitudinal aperture
55 rotation of the eccentric |8 causes the connect
12 to receive a lubricant impregnated wick 18
ing rod 28 to produce a rocking motion of the and its associated springs 14 to lubricate the 55
bearing member 2| and in turn will cause the connecting rod 28.
claws 8 and 8 of the shuttle fork l8 to be moved 8 . As was stated before, one object of the inven
through an arc concentric with the bearing mem
tion is to obtain a fast “pull down” and a com
ber 2|. It is this motion of the claws which pulls paratively long "dwelP’ of the film.‘ This is ac
the ?lm downward past the picture aperture “I
provided in the aperture plate 4 (Fig. l) .
Describing now the means for moving the claws
8 and 8 in and out of engagement with the ?lm,
a second connecting rod 82 (Figs. 3 and 4) is
also journaled at one end upon the crank pin l8.
The other end of the connecting rod 82 is pivot
ally mounted as at 88 (Figs. 1 and 3) to a crank
arm 84 which is secured by a pin 84* to a rocking
70 shaft 88. The shaft 88 is journaled within a
bearing member 88 secured to the rear of the
wall 8 by means of screws 88'. The inner end
of the shaft 3» is provided with a rocking cam
81. The cam‘8'l engages a cam follower 88 hav
ing circular supporting studs 88 and 88' (Fig. 1)
complished by rotation of the eccentric disk |8
in a clockwise direction as indicated by the arrow
A (Figs. 1, 2, and 9). When the claws 8 and 8
are moving the ?lm downward as in Figs. 1 and 9,
the length of the lever arm between the crank 65
pin l8 and the center'of the bearing member 2|
is relatively shorter in comparison to the lever
arm between the member 2| and the ends of.__the
claws 8 and 8'than when the claws are moving
in their upward return motion as in Fig. 2, thus
insuring a faster downward movement and a
comparatively slow return. In the operation of
the device, reference is to be had to Figs. 9, 10,
and 11. The circle “8 is the circle of eccen
tricity of the eccentric pin l8. While the pin l8 75
3
its lower end the claw member 3|" to impart I
a longitudinal ?lm engaging and disengaging
moves from points 0 to b in the direction of arrowv
A the claw member 3| will be moving downward
motion thereto. The cam I2. is so angularly ad
justed that during the downward ?lm advanc
in its ?lm moving stroke whereas from b to c the
member 3| will be moving upwardly in a disen
ing stroke of the claw'member 3|" the inactive
gaged return stroke. _It will be seen, therefore,
that due to the longer arc of travel of the pin I9
portion I20a of cam I20 engages the sides of
cam follower I23 and thus prevents in and out
motion of the ?lm claws. Cam I22 engages a
longer period of dwe_l_l before the photographic ‘cam follower I26 which is slidable horizontally
aperture. When the pin I9 has reached the point within bearings I21 and I21’ and is rigidly con 10
10 11 on circle “6, the registering pins 5| have ‘fully nected to the pilot pins 54''. The cam I22 is also
_ on the return stroke, the ?lm will be given a
engaged the fihnv and the claw member 3| is
From point it to
so angularly adjusted that during the ?lm en
gaging stroke of the pilot pins the inactive por
tion I22a of cm I22 will be in engagement with
cam follower I26 thus preventing movement dur 15
ing that portion of the cycle. Fig. 13 shows the
claw member 3|" at the beginning of its return
stroke, traveling in the direction of the arrow A.
' starting on its upward stroke.
c (Figs. 10 and 11) the cam follower 38 will be
engaged by the concentric, inactive portion 31's
of the cam 31, thus preventing a sawing motion
15
‘ . of the registering pins 54 relative to the ?lm dur
ing the major portion of the exposure.
Referring now to Figs. 1 and 6, it will be noted
that the rear ?lm guide wall 5 is apertured at 22
20 opposite the picture aperture III to receive a
pressure roller assembly 13 slidabiy therein. As
sembly 13 comprises a pair of rollers 1| and 15
rotatably mounted within a cage 16 which is
At this point the pilot pins El" have fully engaged
the ?lm I" and will remain in this position until 20
the eccentric l9" reaches the point a‘ after which
the pins 5|" will begin to disengage. At this
time the pull down claws 9" will begin to enter
the ?lm perforations. By the time the eccentric
has traveled from point I to g the pilot pins 54" 25
resiliently pressed against the ?lm I passing
through the aperture plate 4 by means of a spring
will be completely disengaged and the pull down
11 secured to the rear of the guide wall 5 by ‘ claws completely engaged and ready to advance
means of a screw 13.
'
'
the ?lm downward. ' Fig. 14 shows the claw mem
The aperture plate 9 is pivotally mounted at
its upper end to the wall 9 by means of a stud 19.
30 Referring now to Figs. 1 and 7, it will be noted
that the lower end of the aperture plate 4 is pro
vided with an elongated slot II through which
projects a stud 32 secured to the rear wall 9 by
means of a nut 22'. The forward reduced end
35 portion 8| of the stud 32 has a pin 93 projecting
ber 3|" half way through its ?lm advancing
stroke and traveling in the direction of arrow B. 30
The pilot pins SI" are now at their fully retracted
position. When eccentric 19" reaches point It
the pull down claws 9" are at the end of their I
the pilot ,
stroke, ready to be disengaged while
pins 54" are about ready toengage the perfora- ,
tions'. During the travel. of eccentric I9" from
h to j the pilot pins 54" engage the ?lm per
transversely through it which is adapted to be
engaged within a bayonet slot indicated at ll
forations and the claws 9" are disengaged.
Referring now-to Figs. 4 and 8, it will be noted
that the eccentric disk I3 of the pull down mech- anism is driven through a, ?exible ?ywheel gen
provided on a sleeve member 95. A handle 35'
on the member 3| allows for rotation so as to
40 lock a conical shoulder 39 upon a similar shaped
seat 31 of the aperture plate 4. By releasing the
sleeve member 24, the aperture plate may be
swung forward into the position shown by the
dotted lines 33 in Fig. 1 to thus allow for thread
ing or removal of the ?lm within the picture gate
and also to allow for cleaning the ?lm passages.
A sleeve member II2, similar to that of 95, is
erally indicated at '9. A spindle 9|Icarrying
the eccentric disk i8 at one end and the ?ywheel
99 at the opposite end is iournaled within a bear
ing 9| provided in the wall 92 forming part of .45
the camera casing. The ?ywheel 39 comprises. a disk 93 secured to the spindle 90 by a key 93'
and- has a relatively heavy rim 94 secured thereto
by means of bolts 35. A second disk “is pro
vided adjacent the rim 94 and is secured to a, 60
provided on the upper stud 19' to retain the aper
ture plate thereon. I
Fig. 12 .is a diagrammatic view of a modi?ed
second shaft 91 coaxial with the spindle 90. The
shaft 91 is journaled at one end within bearing
50 form which is similar to that shown in Figs. 9 to
11 except that the cam 31' is adjusted‘ to a
93 and at the other end within a ball bearing 99 -
diiferent angular position in relation to the arm
55
secured within a hub Ill provided at the inner
end of the ?ywheel disk 93. Connection between 55
the ?ywheel 29 and the disk 96 is secured by
means of springs ‘as at III and I02 as shown in
Fig. 8. These springs are secured at one end to
pins I33 projecting from the disk 99 and at their
other ends to pins Ill having heads I05 which»
34' in which case the inactive portion 31'a is in
contact with the ‘cam follower 33' during the
downward ?lm advancing stroke of the pull down
‘ member 3|. ~In this particular form saw
claw
ing action between the ?lm claws and the ?lm
perforations is prevented during the ?lm ad
vancing stroke.
-
are mounted within counter-bored holes I06 of
threaded screws I91. The screws I31 are thread
Figs. 13 and 14 are diagrammatic views of a
further modi?ed form of pull down mechanism in
ably mounted within the rim 94 of the ?ywheel
39. A spiral gear Ill secured upon the shaft 91 65
meshes with another spiral gear I99 mounted on
which sawing action is prevented on engagement
of the ?lm by .both the pull down claws and the
65.
pilot pins. In this arrangement a cam I2. is
actuated by an arm 34" through a connecting
rod 32" by an eccentric I!" in a manner similar
to that shown in Figs. 9 to 12. , Cam I29 pivots
about a point |2| and has a second cam I22
rotatably secured inany suitable manner thereto
70
to also rotate about the point I2I. Cam I22 en
gages a rectangular cam follower I23 rigidly pro
vided upon the upper end of a link member I24.
Member I24 is pivotaily mounted at I25 upona
stationary support (not shown) and engages at
_
a motor drive shaft III.
‘
‘
,, In balancing the ?ywheel and the accompany
ing pull down mechanism, a mark is placed on
the outer edge of the rim 94 of the ?ywheel 89 70
and while rotating the ?ywheel. is viewed through
a stroboscspe (not shown). The tension of the
springs ‘in and I32 is then adjusted by'means
of the screws "1 until the mark upon the ?y
wheel ” appears to be stationary in the stroboe
4
2,124,322
scope at which point the ?ywheel and the pull
part a ?lm engaging and withdrawing motion to
down mechanism will he in correct balance.
A pin I I3 secured to the ?ywheel disk it pro
jects through an elongated slot Ill in the disk
36. Normally the pin Iii rests in the center of
said
5.
ture
?lm
the slot I ll but when starting, the end of the slot
engages the pins H3, due to inertia of the ?y
wheel rim 94 to'bring the pull down mechanism
centric,_ an operative connection between said
eccentric and said member for pulling down said
up to normal speed.
10
_
The eccentric disk It may be provided with
'gear teeth around its periphery through which
the shutter and other ancillary mechanism may
be vdriven.
'
Having thus described the invention, what is
15 claimed as new and desired to secure by Let
ters Patent, is:
-
1. A ?lm pull down mechanism comprising the
combination of a ?lm advancing member, a rock
ing slide bearing for said member, an eccentric,
20 a drive shaft for said eccentric, a connecting
member slidably connected to said bearing and
pivotally connected to said eccentric, meansfor
imparting an oscillating motion to said ?lm ad
vancing member under control of said connect
25 ing member, a second connecting member pivot
ally connected to said eccentric, a cam, an oper
ative connection between said second connecting
member and said cam, a cam follower for said
cam and an operative connection between said
30 cam follower and said ?lm engaging member for
imparting a ?hnengaging and disengaging mo
member.
A ?lm advancing mechanism for motion pic
apparatus comprising the combination of a
guide, a ?lm advancing member adapted to
intermittently move a ?hn in said guide, an ec
member, a cam, an arm connected to said cam,
a link connection between said arm and said 10
eccentric, a cam follower connected to said mem
ber and adapted to be engaged by said cam for
imparting a ?lm engaging and disengaging mo
tion to said member.
j-
_
r
6. A ?lm pull down mechanism comprising th 15
combination'of a ?lm guide, a ?lm advancing
member adapted to intermittently. move a ?lm in
said guide, a sliding rocking bearing for said,
member, an eccentric for rocking said member
about said bearing, a cam» operated by said ec
centric, a cam follower adapted to be positively
actuated in opposite directions by said cam, and
20
an operative connection between said cam fol
lower and said member for reciprocating said
member.
25
7. A ?lm advancing mechanism comprising the
combination of a ?lm advancing member, a ?lm
registering member, an eccentric,.means for ro
tating said eccentric, a cam, a link connection
between said eccentric and said cam for oscillat
30'
ing said cam, a cam follower for said cam. an
tion to said ?lm advancing member.
operative connection between said follower and
2. A ?lm advancing mechanism comprising the ‘said ?lm advancing member for engaging and
combination of a ?lm advancing member, a pivot
disengaging said ?lm advancing member with the
al slide bearing for said member, a rotating mem
?lm, a second cam connected to said link con 35
ber having an offset portion thereon, a connecting nection, a cam follower for said last mentioned
member slidably connected to said bearing and cam‘and an operative connection between said
engaged by the offset portion of said rotating last mentioned follower and said‘ ?lm register
member, means for imparting an oscillating mo
ing member.
40 tion to said ?lm advancing member under control
8. A ?lm advancing mechanism comprising the
of said connecting member, a cam, a cam follower,
an, operative connection between said cam fol
lower and said ?lm advancing member for trans
mitting a ?lm engaging and disengaging motion
to said ?lm advancing member, a second connect
ing member engaged by the o?set portion of said
rotating member,‘ and an operative connection
between said cam and said second connecting
member for oscillating said cam.
3. A ?lm pull down mechanism comprising the
combination of a ?lm advancing member, a rock
ing bearing for said member, said member being
slideable in said bearing, an eccentric, a con
necting rod pivotally connected to said eccentric
55 and slideably connected to said rocking bearing
for imparting an oscillating movement to said'
?lm advancing member, a second connecting rod
pivotally connected to said eccentric, a cam, an
operative connection between said second con
necting rod and said cam, a cam follower for
said cam, a register pin member operated by said
cam follower and a link between said cam fol
lower and said ?lm advancing member for im
parting in and out motion to said mechanism.
4. In a motion picture ?lm advancing mecha
nism the combination, with a ?lm guide, of a
?lm advancing member adapted to engage and
advance a ?lm‘ in said guide, an eccentric, means
for transmitting motion from said eccentric to
said ?lm advancing member for pulling down said
member, a cam,.a connecting rod connecting said
combination of means providing a ?lm path, a
?lm advancing member’therefor, a ?lm register
ing member, an eccentric, a cam, rotatable driv
ing means, a link connection‘ between said eccen
tric means and said cam for oscillating said cam,
means interconnecting said cam and said ?lm
advancing member for moving said ?lm advanc
ing member into and out of said path, means in
terconnecting said eccentric and said ?lm ad
vancing member for imparting a ?lm advancing
stroke to said ?lm advancing member while in
engagement with said ?lm, a second cam, means
connecting said second cam ,with' said link con—
nection for oscillating said second cam, and means
interconnecting said second cam; and said ?lm
registering member for moving said ?lm register
ing member into and out of said path.
9. A ?lm advancing mechanism comprising the
combination of a ?lm advancing member, a ?lm
registering member, a pair of cams, respective
cam followers opcratively connected to said ?lm
advancing member and said‘ ?lm registering
member, said respective cam followers engaging
respective ones of said cams, an eccentric, means
for rotating said eccentric, and a link connection 65.
between said eccentric and said cams for oscillat
ing said cams about a ?xed point.
10. A ?lm advancing mechanism comprising the
combination of a ?lm advancing member, a ?lm
registering member, a pair of cams having active 70
and inactive portions thereon, respective cam fol
eccentric to said cam for imparting an oscil ‘ lowers operatively connected to said ?lm advanc
lating motion ‘to said cam, a cam follower for ing member and said ?lm registering member,
said cam, and a connection between said cam said respective cam followers engaging respec
iollowerandsaid?lmadvancingmembertoim
tiveonuoisaidcamsiorimpartinga?lmen
2,124,”:
gaging motion to‘said members. an eccentric,
and a link connection between said eccentric and
said cams for- oscillating said cams, said inac
tive portions of said respective cams engaging
said respective cam followers when said respec
tive members are in ?lm engaging position.
11. A motion picture ?lm advancing mecha
nism comprising a ?lm advancing member, an
eccentric, a pair of independently movable con
10 necting rods, means for pivotally connecting both
of said rods ?xedly to said eccentric, cam means
between one of said rods and said member for
controlling the ?lm engaging and disengaging
motion of said member and means for controlling
the ?lm advancing motion of said member by the
other of said rods.
12. A motion picture ?lm advancing mechanism
according to claim 11 wherein both of said rods
are pivotally connected to the same point on said,
20
eccentric;
'
13. A film pull down mechanism comprising the
combination of a ?lm advancing member, a ?lm
registering member, a rocking slide bearing for
said ?lm advancing member, an eccentric, av
connecting member pivotaliy connected to said
eccentric, means interconnecting said ?lm ad
vancing member and said connecting member for
imparting an oscillating motion to said ?lm ad,
vancing member under control of said connect
ing member, a cam, a second connecting member
plvotally connected to said eccentric, an operative
connection between saidsecond connecting mem 10
ber and said cam, a link, a pivotal support for
said link, a cam follower on said link and oper
‘atively connected to said cam, an operative con
nection between said link and said ?lm advanc
ing member for producing a ?lm engaging and
disengaging motion to said ?lm advancing mem
ber, a second cam operatively ‘connected to said
second connecting member, a cam follower for
said second cam and an operative connection be
tween said last mentioned cam follower and said 20
?lm registering member.
,
~
>
ALBERT W. TONDREAU.
Документ
Категория
Без категории
Просмотров
0
Размер файла
947 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа