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NOV- 12, 19467
J. B. CONTNER
2,410,962
FILM-FEEDING MECHANISM
Filed April 13, 1944
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INVENTOR.
J ?ag/1' [on/war
M, 0.41.1,I7TOR/VEKS
V
Patented Nov. 12, 1946
2,410,962
UNITED’ STATES PATENT "OFFICE
Application April 13, 1944, Serial No. 530,824
7 Claims.
(01. 88-184)
1 .
This invention relates to‘ a structurally and,
functionally improved ?lm-feeding mechanism
present mechanism may be used in conjunction
with optical printers and similar mechanisms.
and in its more speci?c aspects aims to provide
With the foregoing in mind, the illustrated com
such a mechanism primarily intended for use in
bination and certain portions of the following
motion picture cameras, projectors and similar 5 speci?cation are to be regarded in an illustrative
types of units.
rather than in a limiting sense.
It is an object of.’ the invention to furnish a.
Thus, referring to Fig. 1, it will be seen that
mechanism of this type and which will operate
the reference numeral HI indicates a casing pro
to properly feed and register frames or desired
viding a light-proof‘enclosure through which a
‘portions of a ?lm or its equivalent with portions 10 ?lm ii to be exposedllisvfed. This ?lm moves
or units of a mechanism through which the ?lm
in guiding relationship with respect to a gate
is fed. Accordingly, the di?iculties heretofore en
I 2 disposed adjacent an aperture l3. One of a
countered in this connection and especially as a
series of lenses ll maybe disposed in operative
consequence of the twisting and shrinking tend
relationship with respect to this aperture.
A
encies of acetate ?lm are avoided.
16 shutter I5 is interposed between the selected lens
A further object of the invention is that of
and the aperture i3 to periodically interrupt and
providing a mechanism which will not alone func
permit the passage of light rays through the
tion with entire satisfaction despite any shrink
age ‘which may have occurred in the length of
.The shutter 15 is-as illustrated-of the rotary
the ?lm but will also operate in a satisfactory 20 type and is driven, for example, by a shaft It
manner despite the fact that the sprocket holes
mounting a gear, the teeth of which mesh with
of the ?lm may have shrunk or otherwise become
a gear l1 secured to the shutter-mounting shaft.
distorted. I
The drive shaft l6 also serves in any suitable
An additional object is that of furnishing a
manner to effect rotation of the s aft It. The
?lm-feeding mechanism which will embody rela
latter, as hereinafter described, operates the ?lm
tively few parts, each individually simple and
feeding mechanism. It will also be observed that
rugged in construction, these parts being capable
the shaft It may serve to operate additional ele
of ready manufacture and assemblage and when
ments or accessories; the lay-out of these sev
so assembled operating over long periods of time
eral parts having been illustrated and described
with freedom from, all difficulties. '
in detail in the parent application heretofore
Moreover, by means. of the present invention,
referred to.
>
.
a feeding mechanism is furnished which/,may be
Also, as described in that application, portions
aperture.
substituted for an equivalent mechanism in an
assembly as heretofore constructed; such sub-.
stitution serving to overcome the difficulties in
reference is had to the attached sheet of draw
ings illustrating practical embodiments of the
1
'
a camera and showing the improved feeding
40 assembly 2| may be disposed. This assembly ter
minates conveniently in an eyepiece 22. Thus,
mechanism in association therewith;
' Fig. 2 is a sectional plan view in enlarged scale
' as has been brought out in the earlier application,
an operator may employ this assembly as a ?nder
and observe precisely the image which'is being
of that mechanism;
received upon the sensitive ?lm H.
Fig. 3 is a sectional side view taken along the
lines 3-3 and in the direction of the arrows as
v
indicated in Fig. 2;
Fig. 4 is a perspective view showing in enlarged '
scale a portion of the mechanism illustrated in
the foregoing ?gures; and
'
Fig. 5 is a face view of certain of the parts '
as shown in Fig. 4.
While in the illustrated embodiments the in
vention has been shown in association with a
motion picture camera and especially a camera
employing l?-millimeter ?lm, it is primarily to
-
will be re?ected through a suitable lens and mir
ror assembly l9. Thence, they will be re?ected
through a tubular extension 20 which may form
a part of the casing. Within this extension a lens
With the foregoing and other objects in mind, I
Fig. l is a sectional plan view taken through
.
of the shutter l5 may provide reflective surfaces.
Consequently, light rays passing through the lens
assembly I‘ and striking against these surfaces
herent to the original mechanisms.
invention, and in which:
>
r
'
As afore brought out, the invention, while in
many respects of a special utility whenemployed
in connection with a camera or projector, of the
moving picture type will be of equal value in as
sociation with various other types of apparatus
which require the precise feeding and positioning
of a strip of material such as a ?lm. Therefore,
the heretofore described embodiment is to be re
garded merely as illustrative and depicting a pre
ferred association of the invention. Likewise,
the gearing and operating mechanism may, in
that particular association or any other to which
the present invention has application, be mod
i?ed in any desired manner. However, it will be‘
be understood that the present invention may be
employed to feed ?lms of other sizes not alone in
a camera structure but also, for example, in 60 noted that by virtue of the aperture [3 thereis
a projector assembly. As will be obvious, the
incorporated in the present illustration a zone
2,410,962
3
trated and heretofore described in order to im
part to the bar and arm the desired movement,
any proper and substitute mechanism might be
utilized. Also, while as illustrated, the bar en
gages only the successiveapertures of a single
row of feeding perforations, the structures might
other strip is to be precisely ‘positioned and ir
respective of the pecularities and characteristics
of that strip.
4
cisely the form of actuating mechanism illus
or position which may be de?ned as a, station. It
is with respect to this station that the ?lm 'or
,
With the foregoing in ‘mind, attention is now
' directed to Figs. 2 and 3. In these views, the
be modi?ed in order to assure the proper engage
reference numeral l3 again indicates a shaft
ment of any desiredv number of rows of apertures
which is rotated by a suitable operating mecha
nism. This shaft may be supported by an anti 10 as would be employed, for example, in 35-milli
meter or larger ?lm or, strips. '
frictional bearing 23. Conveniently encircling
As will be readily appreciated by those con
the shaft I8 is a bushing 24. Beyond this element
versant with this art, considerable dimculty has
the shaft mounts a rotary member 25 conven
been experienced in using an acetate ?lm base
iently formed with a cam track 23. The member
or disc 25 mounts a crank which may be in the 16 due to the tendency of the latter to twist and
shrink to a greater degree than in the case of a
form of a headed pin 21, the shank of which ex
nitrate ?lm base. It has been customary to dis
tends through a slot 23 formed in a pull-down
. pose the feeding mechanism and especially the
arm or lever 29. The forward end of this arm
?lm or strip-engaging portions thereof at a point
terminates in an aperture-engaging tooth or
projection 30. The rear end of the arm is rock-, 20 above or below the station de?ning the exposure
or projection aperture. Thus, any tendency of
ingly supported by means of a pivot 3i.
Thus, it is obvious that as the shaft i8 rotates
the ?lm to distort or shrink has resulted in faulty
registration adjacent this station; the greater the
distance between the ?lm-feeding and engaging
spondingly shift the tooth or projection 30. With
the latter element engaging a feed perforation 25 mechanism and that station, the greater the re
sultant error. As will be observed, it is pre
32 in the ?lm ii, it is apparent that the strip
ferred-according to the teachings of the present
will be shifted so that for example one frame
invention-to locate the ?lm-engaging and -feed
will be moved from the station as de?ned by
ing mechanism immediately adjacent or within
the aperture l3 and be displaced a distance such
that it will be beyond the light rays thereafter 30 the zone of this station, thereby reducing the dif
the arm or lever 29 will be oscillated to corre
?culties as heretofore experienced.
The difficulties with respect to improper reg
entering the aperture. At the same time, a sec
ond frame portion will be registered with this
aperture station. It is obvious that thereupon
_ vistration are substantially completely overcome
the tooth should be disengaged from the edges ' by virtue of the fact that a ?lm or strip registra
of the ?lm-feed opening and caused to engage‘ a 35 tion mechanism is employed and which assures a
second or successive opening of this type.
In order to achieve this result, it will be ob
served that the pivot 3| extends from a bar 33.
proper disposition of the ?lm with respect to the
station or zone which it is to occupy. This mech
anism is preferably operated by means of the bar
33 and includes, as shown, an extension 31 pro
A pin and slot connection 34 serves to support '
the bar 33 for reciprocation adjacent one of its 40 jecting to one side of and beyond the strip II.
ends. The bar is formed with a slot 35 adjacent
its opposite end and this slot conveniently frames -
or encircles the bushing 24. A pin or follower
36 rides within the cam track 26 and is secured “a
to the bar 33. Accordingly, as the shaft I3 ro 45
tates, it is obvious that, in addition to oscillat
ing the arm 29, the bar 33 is reciprocated. This
bar being connected to that arm by means of the
'pivot 3| reciprocation will also be imparted to ' "
that arm. Thereforegthe outer end of the latter 50
will have a cycle of movement as follows:
‘
This extension is bent upon itself to provide
what might be termed a hook portion terminat
ing in pins 38 and 39. These pins are spaced 9.
distance preferably equal to the spacing of the
?lm-feed openings 32 in the strip ll. Also, these
pins are conveniently located adjacent the upper
and lower respective ends of the station.
Being mounted by the bar 33 they have a re
ciprocatory movement imparted to them. Also,
it will be noted that they engage the ?lm or strip
II as the latter is freed' from engagement of the
tooth or projection 30. Therefore, when the film
is not moving, these pins assure against any ac
cidental shifting of that film in addition to reg
The tooth 30 will be projected into the ?lm
feed opening 32 of the ?lm or equivalent strip ll.
Such strip is at that moment stationary. Ac- .2 '.
cording to the direction of rotation of the shaft 55 istering its body perfectly with respect to the
station.
l8, the end portion 30 will now either be ele
As shown especially in Figs. 4 and 5, the upper
vated or depressed carrying with it the film strip.
registration pin 38 is of a width substantially
According to the embodiment under considera- '
equal to that of the perforation or ?lm openings
tion, the shaft l3 as viewed in Figs. 2 and 3 is ro
tating in a clockwise direction. Therefore, after 60 32. It is of less height than the normal height
of that aperture. As also shown in these views,
the tooth or projecting portion 33 has engaged
it is preferably slotted in a vertical direction.
the ?lm opening, the strip II will be moved down
Therefore, even if the sprocket opening has
wardly. After the arm 29 has been depressed
to the limit of its movement, the bar 33 will be ' shrunk in width, this registration pin will be ca
retracted thereby withdrawing the projection 30 65 pable of penetrating the aperture without frac
turing the edges-thereof. _ The lower registration
from the feed opening. Thereupon, the arm 29
pin 39 is of a height and width such that it is
will be shifted upwardly to the limit of its move
ment. When this has occurred, the bar 30 will _ normally equal in dimensions to the dimensions
again be projected to correspondingly move the ‘ ‘ of the feeding openings. In view of the fact that
arm 29 and cause the projection or tooth 30 to 70 this pin is engaging the same opening which has
theretofore been successively engaged by the pin
enter the next opening in the film orstrip. This
33 and the tooth or projection 30, no difficulties
cycle will be repeated as frequently as the shaft
will be experienced incident to improper framing
.
of the ?lm areaor frame and irrespective of any
At this time, it is to be understood that, while
in many respects it is preferred to employ pre 75 ?lm shrinkage which may have occurred. Addi
l3 revolves.
'
2,410,962
5
tionally, the lower pin 39 may be slotted diago
nally. Therefore, it will be sufficiently ?exible to
automatically compensate for both vertical and
horizontal shrinkage if aperture shrinkage has
ture and thereafter retracting said member from
the perforation, and strip-engaging means in
cluding a pair of pins located adjacent opposite
ends of said aperture, one of said pins being pro
occurred. Of course, neither the pin 38 or 39 5 jectable into said perforation substantially si
need be slotted nor need they be slotted in the
multaneously with the withdrawal therefrom of
particular manners shown in the drawing. For
said member, the other of said pins being dis
general purposes, however, I'have found that
posable in a perforation of said strip about to be
these types of construction are preferable.
engaged by said member; and means whereby
Thus, among others, the several objects of the 10 said pins incorporate a yieldingly ?exible struc
invention as speci?cally aforenoted are achieved.
ture.
Obviously, numerous changes in construction and
rearrangements of the parts might be resorted to
5. A mechanism for feeding a strip formed
with perforations past a display aperture, said
without departing from the spirit of the inven
tion as de?ned by the claims.
mechanism including in combination a member,
operating means for projecting said member into
I claim:
'
a strip perforation disposed adjacent said station,
.
1. In a motion picture apparatus, a ?lm-feed
thereupon shifting said member to one side to
correspondingly move said strip past said aper
ture and thereafter retracting said member from
the perforation, and strip engaging means in
ing mechanism including a slidably mounted bar,
fihn-retaining means extending from said bar, a
rocking arm pivotally supported by said bar. and
cluding a pair of pins located adjacent opposite
' presenting at its end a ?lm-engaging and shift
ing portion, a cam and crank portion rotatably
supported with reference to said bar and arm,
means for coupling said bar with said cam por
ends of said aperture, one of said pins being pro
.iectable into said perforation substantiallysi
multaneously with .the withdrawal therefrom of
tion to impart to the bar and ?lm-retaining
means a purely reciprocatory movement, and
means for operatively coupling said rockingly
said member, the other of said pins being simul
taneously disposable in a perforation of said
strip about to be engaged by‘said member; one
mounted arm with respect to said crank portion
of said pins being of less area than the normal
to cause said ?lm-engaging portion to move in
area of the'perforation through which it is to pro
substantial immediate proximity to' said ?lm 30 ject, the other of the same presenting side faces
retaining means and whereby, as said ?lm-en
of substantially the same area as the normal
gaging portion is retracted from a perforation of
perforation area.
the film, the ?lm-retaining means carried by
6. A mechanism for feeding a strip formed with
said bar is caused to project into said perforation.
perforations past a display aperture, said mecha
2. A mechanism for feeding a strip formed
nism including in combination a member, oper
with perforations past a display aperture, said
ating means for projecting said member into a
mechanism including in combination a member,
strip perforation disposed adjacent said station,
operating means for projecting said member in
thereupon shifting said member to one side to
to a strip perforation disposed adjacent said sta
correspondingly move said strip past said aper
tion, thereupon shifting said member to one side 40 ture and thereafter retracting said member from
to correspondingly move said strip past said
the perforation, and strip engaging means in
aperture and thereafter retracting said mem
cluding a pair of pins located adjacent opposite
ber from the perforation, and strip engaging
ends of said aperture, one of said pins being pro
means including a pair of pins located adjacent
jectable into said perforation substantially si
opposite ends of said aperture, one of said pins 45 multaneously with the withdrawal therefrom of
being projectable into said perforation substan
said member, the other of said pins being dis
tially simultaneously with the withdrawal there
posable in a perforation of said strip about to be
from of said member; the other of said pins be
engaged by said member; one of said pins being
ing disposable in a perforation of said strip
transversely slotted and the other of the same be
about to be engaged by said member.
50 ing diagonally slotted whereby the bodies of said
3. A mechanism for feeding a strip formed with
pins are rendered ?exible.
perforations past a display aperture, said mecha
7. A motion picture apparatus including a cas
‘nism including in combination a member, oper
ing formed with an aperture adjacent which a
ating means for projecting said member into a
perforated strip is to be moved, a mechanism
strip perforation disposed adjacent said station, 55 mounted by said casing for so moving said strip,
thereupon shifting said member .to one side to
said mechanism-comprising a pair of pins, means
correspondingly move said strip past said aper
_ for mountingsaid pins whereby one of the same '
ture and thereafter retracting said member from
is disposed adjacent one end of the aperture and
the perforation, and strip engaging means in
the other of the same is disposed adjacent the
cluding a pair of pins located adjacent opposite 60 opposite end thereof, means for shifting said
ends of said aperture, one of said pins being pro
-mounting means to cause said pins to enter ad
jectable into said perforation substantially simul
jacent strip perforations in registration there
taneously with the withdrawal therefrom of said
with and to be retracted from said perforations,
a strip-shifting member, means for supporting
member, the other of said pins being disposable
in a perforation of said strip about to be en 65 the same to have movement in the zone between
gaged by said member; and one of said pins being
said pins, and means for causing said shifting
of less height than the normal height of the per
member to enter one of the perforations of the
strip substantially simultaneously with the va
foration to receive the same. .
4. A mechanism for feeding a strip formed
cating of said perforation by one of said pins,
with perforations past a display aperture, said 70 to shift the adjacent zone of said strip past said
mechanism including in combination a member,
aperture and to retract from'said perforation
operating means for projecting said member into
substantially simultaneously with the latter'sbe
a strip perforation disposed adjacent said sta
ing entered by the second of said pair of pins.
tion, thereupon shifting said member to one side
to correspondingly move said strip past said aper
7'5
J BURGI OONTNER,
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