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Patented Oct. 29, 1946
' 2,410,121
UNITEDA STATES PATENT oFFlcE
2,410,121
SPROCKET
Louis A. McNabb, Glenview, IllL, vassignor to Bell
& Howell Company, Chìcago‘Jll., a corporation
of Illinois.
Application June s, 1945, serialno». 598,385`
-
14 Claims.
(o1. v4-24s>>
2
l
stopV ring I3 is secured onthe outer face of the
supportv member 3 in concentric relation there
with and. overliesthe marginal portion of the re
cess i! and is thus engageable. by the marginal
My invention relates to- perforated ?ilrnA feed
sprocket. devices of motion picture machines, al
though not limited toA this use alone, and has par
ticular; relation to such- devices involving a
sprocket having: sprocket teeth onlyV at one end
thereon'
~
portion of, the guide il to limit outward movement
of the guide. Rotation of the guide S` is pre
` vented by a> guide pinM secured on the support
'
Objet-:tsmc the invention reside in theY provi
sionl of a novel and effective guide means for
releasably retaining- a perforated strip engaged
on- afsprocket, which prevents punching or em
bossing of'the strip byl reason of; the guide being
pressed against the outer face of> the strip While
the-strip rides on to-p of theteeth of thesprocket,
which isconvenient in engaging‘the strip on and
removing the same rromvthe sprocket, and which.
is inherently of an unobtrusive and simple ap
pearance.
The invention Will bebetter understoody byv ref-`
erence to the accompanying drawing forming apart hereof andY in Which
Figures 1 and. 2 are sectional views- of a sprocke.
member 3 in parallel relation with the spindle
5 and. slidably engaging in an aperture l5V
through. the guide.
The central portion of the guide 9 is offset
outwardly axially of. the guide, as designated at
l5, and projects into, an annular channel il in
the inner end, portion of the sprocket lj; this ofi
set portion. Hi' affording considerable space be
tween it. and the outer end of the bushing 5. A
helical compressionl spring i8 encircles the spin
die 5. and hub l2 between the offset portion IS.
and the bushing 6 and, is operative between this
20 oiîset portion andbushing to yieldably urge the
guide gfaxiall’y of the sprocket 1 and outwardly
et device embodying my invention and- taken on
the line l-i of Figure 3, these views sho-Wing
parts in- different' positions;
into engagement with?the stop ring I3, as shown
Figure 4« is a view in elevation similar to that.
of Figure 3 and having parts. ofthe structure.
shown in section;
Referring to the drawing, l4 designates a sup-A
portv or `frame which is provided withA a circular
recess 2, andan annular support-member 3e is se-«
I9' only inthe region of its inner end, and the
sprocket. is. also provided- with a strip edge en
gaging shoulder 2l in the region o-f its outer end
in Figure 1,., the guide. being movable, against the
influence of this spring, inwardly axially of the
Figure 3 is an. endl elevation of the sprocket 25. sprocket into the position shown* in Figure 2;
The sprocket T is provided with sprocket teeth
device; and
’
`
cured in this recess and forms a part off. the sup
port or'frame. See Figuresv l and 2; The mem.-V
ber 3 is counterbored inwardlyl from the outer
face thereof to form aoircular recess II.v
A spindle 5y is rotatably mounted on; the sup
port I- through the medium. of a bushing 6., and
this; spindlev is disposed concentrically oi the. re-Ä
cess~ 4 and projects through this recess` and outwardly of the support. Avñlm sprocket; l is,se:« »
cured on the projecting. .end of the spindle 5 by.
. means of. a set screw 8, the sprocket being dis`
posed in projecting relation with the sllpllëortA and»
being rotatable with the spindle' whichis driven
in a usual manner.
'
and" facing towardits inner end'. A strip 22, such
as a motionA picture filmstrip provided with feed
perforations 23„ is engaged on the sprocket with
feed' perforations of the strip engaged on teeth
of the sprocket for feeding the strip, the annular
shoulder 2`l being engageable with the opposing
ed'gevof the strip for laterally guiding the same in
one direction, and guide rollers 24 carried on the.
support I' serving to guideY the strip to> and from
the sprocket, as shown in Figures 3* and 4.
The guide 9 is provided with an arcuate por
40
ti'on 2_5' extending correspondingly with the pee
riphery of. the sprocket l and the internal sur
face Z5 of this portion. provides a guide surface
facing radialiy of andtoward the sprocket axis
.vandengageabl‘e with> the outer face of the strip
45 'V22
engaged on, the sprocket to retain the feed
A strip retaining guide 9 of circular disk form
is disposed- inY the region otk the inner end- of the>
sprocket 'l and extends betweenv the support
member 3 and the sprocket l transversely of and 50
across the sprocket aXis and is provided with a
central bore il through which thespindle 5. and
períorations of' the strip in engagement with the
sprocket teethwh'en the guide 9 is positioned by
the spring i8 and stop. ring` I3. in its strip guiding
position. as` shownV in Figure 1. The outer face
2l of the guide il immediately inward of' the
surface 2,6, provides a strip‘ edge engaging guide
surface- facing toward the shoulder 2|> of the
an inwardly projecting hub I2 of the sprocket,
sprocket and cooperating with this shoulder in
passes. The- guide .111sy mounted in the recess. 4f
for 'movement axially of», the sprocket. 1, and. a,y 55 laterally guiding the: strip therebetween` when the
2,410,121
3
4
guide 9 is in its strip guiding position. Move
ment of the guide 9 inwardly from the position
thereof shown in Figure l positions the guide
but having thus described my invention, I claim
out of strip guiding position as shown in Figure 2
in which position of the guide the strip may be
conveniently engaged on or removed from the
as new and desire to secure by Letters Patent
the following:
1. In a sprocket device, the combination with
a support, of a revoluble sprocket carried there
with in projecting relation with the same and
sprocket.
.
provided with sprocket teeth in the region of its
The external surface 28 of the arcuate portion
innerv end, a strip retaining guide disposed in
25 of the guide S provides a cam surface which
‘ie region of the inner end of said sprocket and
is inclined with respect to the sprocket axis and 10 provided with a guide surface facing radially of
faces in the direction of the outer end of the
and toward the sprocket axis and engageable with
sprocket 'i and radially outward of the sprocket
the 'outer face of a perforated strip engaged on
axis and is engageable by the opposing edge of
said sprocket, and said guide being mounted for
the strip 22 as an incident of engaging the strip
movement
axially of said sprocket into and out
on the sprocket to actuate the guide out of strip 15
of strip guiding position.
guiding position against the influence of the
2. In a sprocket device, the combination with
spring I3 and permit engagement of the strip on
a support, of a revoluble sprocket carried there
the sprocket, the springr Iii being comparatively
with in projecting relation with the same and
Weak and the fitting of the guide 9 with the
parts engaged thereby being suñiciently loose to 20 provided with sprocket teeth in the region of
its inner end and with a strip edge engaging
permit canting of the guide for this purpose.
annular shoulder in the region of its outer end
After the strip is engaged on the sprocket, the
and facing toward its inner end, a strip retaining
spring automatically actuates the guide into strip
guide disposed in the region of the inner end of
guiding position. Thus, engagement of the strip
on the sprocket is an extremely simple and con 25 said sprocket and provided with a guide surface
facing radially of and toward the sprocket axis
venient operation.
engageable with the outer face of a per
Obviously, the portion 25 of the guide cannot
forated strip engaged on said sprocket and with
press against the outer face of the strip 2.2 while
a second strip edge engaging guide surface facing
the strip rides on top of the teeth ofthe sprocket
so that punching or embossing of the strip is 30 toward said shoulder, and said guide being
mounted for movement axially of said sprocket
prevented.
into and out of strip guiding position.
The outer end of the sprocket 'l is concentri
3. In a sprocket device, the combination with a
cally ccunterbored, as designated at 29, and a
support, of a revoluble sprocket carried therewith
push plunger head 3l, at the outer end of the
sprocket, is mounted within this counterbore for 35 in projecting relation with the same and provided
with sprocket teeth only in the region oiI its inner
reciprocation axially of the sprocket and is ac
end and with a strip engaging annular shoulder
cessible for manual depression as by a person’s
in the region of its outer end and facing toward
finger 32 as shown in Figure 2. Three plunger
its inner end, a strip retaining guide disposed in
rods 33 extend within the sprocket 1 and are
arranged in parallelism with and spaced about 40 the region of the inner end of said sprocket and
provided with aguide surface facing radially of
the sprocket axis exteriorly of the spindle and
and toward .the sprocket axis and engageable with
are mounted for reciprocation axially of the
the outer face of a perforated strip engaged on
sprocket in bores 3d through the sprocket. See
said sprocket and provided with a strip edge en
Figures 1, 2 and 4.
The outer ends of the rods 33 are secured with 45 gaging guide surface facing toward said shoulder,
said guide being mounted for movement axially
the plunger head 3| and the inner ends of these
of said sprocket into and out of strip guiding
rods are secured with a ring 35 slidably mounted
position and being yieldably urged into strip guid
in the annular channel l1 of the sprocket and
ing position,.and stop means limiting movement
disposed outwardly of the central offset portion
i6 of the guide 9 and engageable axially of the 50 of said guide into strip guiding position.
sprocket inwardly against the offset portion I6,
this assembly forming a push plunger device
4. In a sprocket device, the combination with a
support and a spindle mounted thereon and pro
jecting therefrom, of a revoluble sprocket carried
on said spindle in projecting relation With said
mounted for reciprocation within and axially oi
the sprocket and operative on the guide 9 axially
of the sprocket for actuating the guide inwardly 55 support and provided with sprocket -teeth in the
region of its inner end, a strip retaining guide
out of strip guiding position by manual depres
sion of the plunger head 3l as shown in Figure 2,
disposed in the region of the inner end of said
thus providing for conveniently positioning the
sprocket and extending between said support and
guide out of strip guiding position for removing
sprocket transversely of and across the sprocket
the strip 22 from the sprocket'J 1 and, if desired, 60 axis and provided with an opening through which
for engaging the strip on the sprocket. ' A helical
said spindle passes and provided with a guide sur
compression spring 3e encircles the extreme outer
face facing radially of and toward the sprocket
end of the spindle 5 and is arranged within
axis and engageable with the outer face of a per
opposing recesses 3'! and 38 respectively in the
forated strip engaged on said sprocket, said guide
sprocket l and plunger head 3l, and is operative 65 being mounted for movement axially of said
between the sprocket and plunger head to yield
ably urge the push plunger device outwardly, as
shown in Figure 1., independently of the spring
i8, thus not necessitating the spring I8 being
sufficiently strong to actuate the push plunger 70
device outwardly.
_
While I have thus described my invention, I
do not wish to be limited to the precise details
described, as changes may be readily made with
out departing from the spirit of my invention,
sprocket into and out of strip guiding position,
spring means operative to yieldably urge said
guide into strip guiding position, and stop means
limiting movement of said guide into strip guiding
position.
5. In a sprocket device, the combination with a
support provided with .a recessv and a spindle
mountedcn said support and projecting there
from centrally of said recess, of a revoluble
sprocket carried on said spindle in projecting
5.
relation .with said support. and provided with
sprocket. teeth in the region. of itsv inner end, a
strip. retaining guide disposed in the region of’l
the inner end» of said sprocket and extending be’
tween. said' support and-sprocket. transversely of
and across .the sprocket axis. and provided' with
an opening through which said spindle passes
and provided. with a guide surface facing radially
of and toward the sprocket', axis and: engageable
into` and out i. of strip guiding», position, spring-
means yie'lgdably urging: said guide into strip
guiding position, and a push plunger devicev
mountedfor reciprocation within and axially of
said sprocket. and operative> on said guide axially
of said, sprocket. forr actuating said guide out'Y of
strip` guiding position and accessible. for ‘manual
i depression» at the. outer end. of said sprocket.
9. In asprocket device, the combination». with
with the outer face, of' a perforated strip engaged 10 a support and a spindle mounted thereon and
projecting therefrom, of arevolulole sprocketv car
on saidi sprocket, said guide: being mounted in said
riedl on said spindle in> projecting relation with
recess for movement axially of `said sprocket into
said support. and provided with sprocket teeth
and out of `strip guiding position,v a helical `com
in the region of its inner end, a.4 strip retaining
pression spring> encircling said spindle and opera-`
tive to yieldably urge said guide into strip. guiding 15 guide disposed in the .region of the inner end
of said sprocket and extending between said sup
position, and stop means limiting> movement of
port and sprocket transversely of and across the
said guide into strip guiding position.
sprocket axis and provided with an opening
6. In. asprocket device, the combination with a
through which said spindle passes and provided
support provided with a recess and a spindle
mounted on said support and- projecting there 20 with a guide surface facing radially of and to
ward the sprocket axis and engagea-ble with the
from centrally of said recess, of a revoluble
outer face oi a perforated stripengaged on said
sprocket carried on saidi spindle in projecting
‘sp-rocken said guide being mounted for move->
relation with said support .and provided with
ment „axially of said sprocket into and> out oi
sprocket teeth` only in the region of its inner end
and provided with a strip- engaging annular 25 strip guiding position, spring means operative to
yieldably urge said guide into strip guiding po
shoulder in the region ofr its outer end and facing
sition, andv a push plunger device mounted for
toward its inner end, a strip retaining guide dis
reciprocation with-in and axially of said sprocket
posed in the region of .the inner end of said
and operative on said guide axially of said
sprocket> and extending-_ betweeny said support and
sprocket for actuating said guide out of strip.`
sprocket -transversely of .and across the sprocket
guiding position andY comprising a plurality of
axis and provided with an opening throughwhi'ch
plunger rods extending within said sprocket and
saidspindle passes and provided with 'a guide sur
arranged in parallelism with and spaced about
face facing radially of and toward .the sprocket
the sprocket axis exteriorly of said spindle and
axis and engageable with the outer face of a per
a head at the outer end of said sprocket and
forated strip engaged on said sprocket and pro
accessible for manual depression and operative
vided with a strip edge engaging guide surface
on said rods.
`facing toward said shoulder, said guide being
10. In a sprocket device, the combination with
mounted in said recess for movement axially of
a support provided with a recessand a spindle
said sprocket into and out of vstrip guiding posi
tion, a helical compression spring encircling said 40 mounted on said support and projecting there
from centrally of Ysaid recess, of a revoluble
spindle and operative between said support and
sprocket carried on said spindle in projecting
guide to yieldably urge said guide into strip guid
relation with said support and provided with
ing position, `and a stop ring secured on said
sprocket teeth only in the region of its inner end
support and overlying the marginal portion of
said recess and eng-ageable by said guide to limit 45 and provided with a strip engaging annular
v shoulder in the region of its outer end and facing
movement of said guide into strip guiding posi
toward its inner end, a strip retaining guide dis
tion.
posed in the region of the inner end of said
'7. In a sprocket device, the combination with a
sprocket and extending between said support and
support, of a revoluble sprocket carried there
with in projecting relation with the same and 50 sprocket transversely of and across the sprocket
axis and provided with an opening through which
provided with sprocket teeth in the region of the
said spindle passes and provided with a guide
inner end thereof, a strip retaining guide dis
surface facing radially of and toward the sprocket
posed in .the regi-on of the inner end of said
axis and` engageable with the outer face of a
sprocket and provided with a guide surface facing
radially of and toward the sprocket axis and en 55 perforated strip engaged on said sprocket and
provided with a strip edge engaging guide sur
gageable with .the outer face of a perforated strip
face facing to-ward said shoulder, said guide be
engaged on said sprocket, said guide being
ing mounted in said recess for movement axially
mounted for movement axially of said sprocket
of said sprocket into and out of strip guiding
into and out of strip guiding position, and means
for positioning said guide in and out of strip guid 60 position, spring means operative to yieldably urge
said guide into strip guiding position, stop means
ing. position comprising an actuating device
limiting movement of said guide into Strip guid
mounted for reciprocation within and axially of
ing position, and a push plunger device mounted
said sprocket .and accessible for manual .actuation
for reciprocation within and axially of said
at the outer end of said sprocket.
8. In a sprocket device, the combination with 65 sprocket and operative on said guide axially of
said sprocket for actuating said guide out of
a support, of a revoluble sprocket carried there
strip guiding position comprising a plurality of
with in projecting relation with the same and
plunger rods extending Within said sprocket and
provided with sprocket teeth in the region of the
arranged in parallelism with and spaced about
inner end thereof, a strip retaining guide dis
posed in the region of the inner end of said 70 the sprocket axis exteriorly of said spindle and
a head at the outer end of said sprocket and
sprocket and provided with a guide surface fac
accessible- for .manual depression and operative
ing radially of and toward the sprocket axis and
on said rods.
engageable with ~the outer face of a perforated
11. In a sprocket device, the combination with
strip engaged on said sprocket, said guide being
mounted for movement axially of said sprocket 75 a support, of a revoluble sprocket carried there
2,410,121,
7
with in projecting relation with the same and
13. In a sprocket device, the combination re
provided with sprocket teeth in the region of its
cited in claim 8 and further characterized in
inner end, a strip retaining guide disposed in the
combination in that said guide is further provided
region of the inner end of said sprocket and pro
with a cam surface disposed radially of the
vided with a guide surface facing radially of and 5 sprocket axis outwardly of said guide surface and
toward the sprocket axis and engageable with
inclined with respect to the sprocket axis and
tlie outer face of a perforated strip engaged on
facing in the direction of the outer end of said
said sprocket, said guide being mounted for move;
sprocket and radially outward of the sprocket
ment axially of said sprocket i-nto and out of strip
axis and engageable by the opposing edge of said
guiding position and being yieldably urged into 10 ‘strip as an incident of engaging said‘strip on
strip guiding position, stop means limiting move
said sprocket'to actuate said guide out of strip
ment of said guide into strip guiding position,
guiding position, and that a second spring meansv
and said guide being further provided with a cam
surface disposed radially of the sprocket out
wardly of said guide surface and inclined with
respect to the sprocket axis and facing in the
direction of the outer end of said sprocket and
radially outward of the sprocket axis and engageable by the opposing edge of said strip as an inci
dent of engaging said strip on said sprocket to 20
actuate said guide out of strip guiding position.
yieldably urges said push plunger device -in the
direction corresponding with movement of said
guide into strip guiding position.
14. In a sprocket device, the combination re
cited in claim l0 and further characterized in
combination in that said guide is further pro
vided with a cam surface disposed radially of
the sprocket axis outwardly of said ñrst men
tioned guide surface and inclined with respect to
the sprocket axis and facing in the direction of
the outer end of said sprocket and radially out
ward of the sprocket axis and engageable by the
opposing edge o-f said strip as an incident of
engaging said strip on said sprocket to actuate
12. In a sprocket device, the combination re
cited in claim 3 and further characterized in
combination in that said guide is further provided
with a cam surface disposed radially of the
sprocket axis outwardly of said ñrst mentioned
guide surface and inclined with respect to the
said guide out of strip guiding position, and that
sprocket axis and facing in thel direction of the
a second spring means yieldably urges said push
outer end of said sprocket and radially outward
plunger device in the direction corresponding
of the sprocket axis and engagea'ble by the oppos 30 with movement of said guide into strip guiding
ing edge of said strip as an incident of engaging
position.
said strip on said sprocket to actuate said guide
LOUIS A. MCNABB.
out of strip guiding position.
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