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Патент USA US2406595

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Aug“. '27, 1946.
2,406,595
C. W. DYER
SPROCKET DRIVE FOR MOTION PICTURE PROJECTORS
Filed March 14, 1945
aWDyer
Patented Aug. 27, 1946
2,406,595
UNITED STATES PATENT OFFICE‘
2,406,595
SPROCKET DRIVE FOR MOTION-PICTURE
PROJECTORS
Charles W. Dyer, Stratton, Maine
Application March 14, 1945, Serial No. 582,695
3 Claims.
1
The present invention relates to motion pic
(Cl. 88—18.3)
2
disks will be adjacent the groove or valley [4
ture projectors and more particularly to a
of the other of the disks, as will be apparent from
sprocket drive mechanism for feeding the ?lm
an inspection of Figures 1 and 3 of the drawing.
through the projector.
A driven disk I5 is secured to the shaft 1 with
An object of the invention is to provide a 5 its edge projecting between the disks l0 and II.
sprocket drive mechanism of this character
Pegs I 6 and I7 project from opposite sides of
adapted particularly for use with motion picture
the disk [5 adapted to ride on the peripheral
projectors of either 8 or 16 mm. ?lm and adapt
edges of the disks [0 and H. The pegs l6 and
ed to maintain a loop in the ?lm of desired size
11 are staggered with respect to each other to
.to prevent cracking or breaking of the ?lm dur 10 space the same from each other circumferen
ing the feeding thereof through the projector.
tially of the disk [5 and the pegs are spaced
A further Object of the invention is to provide
from each other at the opposite sides of the disk
a sprocket drive mechanism of this character
[5 a proper distance so that when one of the
of simple and practical construction, .which is
cam humps I3 engages the peg A, as indicated
ef?cient and reliable in operation, relatively in 15 in Figure l of the drawing, the disk l5 will be
expensive to manufacture, and otherwise well
moved in a direction as shown by the arrows so
adapted for the purposes for which the same is
that the peg B at the opposite of the disk l5,
intended.
will then be moved into a position for seating in
Other objects and advantages reside in the de
the groove or valley M of the other drive disk
tails of construction and operation as more fully
and as the rotation of the drive disks continues,
hereinafter described and claimed, reference be
the trailing ‘edge C of the groove or valley will
ing had to the accompanying drawing forming
also act to continue the rotation of the disk I5.
part hereof, wherein like numerals refer to like
Thus both the cam humps l3 and the .cam
parts throughout, and in which:
grooves or valleys [4 function to engage the pegs
Figure 1 is a side elevational view of the drive
I6 and I‘! for driving the disk I5 and the sprock
mechanism.
et 9.
Figure 2 is a sectional view taken substantially
The feed sprocket 9 is thus driven with long
on a line 2—2 of Figure 1, and
pauses in a substantially step-by-step movement.
Figure 3 is a transverse sectional View of the
In view of the foregoing description, taken in '
driving cams taken substantially on a line 3——3 30 conjunction with the accompanying drawing, it
of Figure 1.
is believed that a clear understanding of the con
Referring now to the drawing in detail, where
struction, operation and advantages of a drive
in for the purpose of illustration I have disclosed
mechanism of this character will be quite ap
a preferred embodiment of .the invention, the
parent to those skilled in the art.- A more de
numeral 5 designates a portion of the housing
tailed description thereof is accordingly deemed
of the motion picture projector in which a drive
unnecessary.
'
shaft 6 and driven shaft 1 are journaled.
It is to be understood, however, that even
The driven shaft 1 is journaled in an eccentric
though I have herein shown and described a pre
bushing 8 by means of which the shaft 1 may be
ferred embodiment of my invention, that the
adjusted to take up wear in the drive mecha
same is susceptible to certain changes fully com
nism.
-'
prehended by the spirit of the invention as here
A ?lm sprocket 9 is secured to the shaft 1 for
in described, and the scope of the appended
feeding the ?lm through the projector at a de
claims.
'
sired uniform speed and to maintain a loop in
Having thus described the invention, what I
the ?lm of a desired size to prevent cracking or
claim is:
breaking of the film.
1. A sprocket drive for motion picture projec
Secured to the drive shaft 6 is a pair of cam
tors and comprising a pair of spaced-apart driv
disks I0 and II maintained in spaced-apart rela
ing cams, each of said cams having a radially
tion by a spacing washer I2.
projecting hump and a substantially shallow
Each of the disks is formed on the peripheral
valley at diametrically opposite edges of the cam,
edge thereof with a tapering cam hump l3 and
a drive shaft connected to the cams and with the
at a diametrically opposite edge with a shallow
hump of each cam arranged adjacent the valley
groove 0r valley [4.
of the other cam, a driven disk, a feed sprocket
The disks [0 and H are secured on the shaft
attached thereto, and pegs projecting from op
6 in a position so that the hump l3 of one of the 55 posite faces of the disk for alternate engagement
2,406,595
4
3
3. A sprocket drive for motion picture projec
tors and comprising a pair of spaced-apart driv
by the humps and valleys to rotate the disk in a
step-by-step movement.
2. A sprocket drive for motion picture projec
ing cams, each of said cams having a radially
projecting hump and a substantially shallow
valley at diametrically opposite edges of the cam,
tors and comprising a pair of spaced-apart driv
ing cams, each of said cams, having a radially
projecting hump and a substantially shallow
valley at diametrically opposite edges of the cam,
a drive shaft connected to the cams and with the
hump of each cam arranged adjacent the ‘valley
of the other cam, .a driven disk, a fe'ed'sprocket
attached thereto, and pegs projecting from op
a drive shaft connected to the cams and with the
hump of each cam arranged adjacent the valley
of the other cam, a driven disk having its edge
‘positioned between the cams, a feed sprocket at
10' tached to the disk, andpegs projecting ‘from op
posite faces of the disk and disposed in the path
of the humps and adapted to enter said valleys
for successively rotating the disk in a step~by
step movement.
posite faces of the disk and disposed in the path
of the humps and adapted to enter said valleys
for driving engagement by the trailing edges of
the valleys for successively rotating the disk in a 15
step-by-step movement.
CHARLES W. DYER.
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