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Патент USA US3083398

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April 2__, 1963
Filed Sept. 6, 1960
Laurel! d, Mil/?ns
United States Patent 0
Patented Apr. 2, 1963
A supply of unexposed motion picture ?lm 12 is re
ceived from a supply reel 13 mounted for rotation on a
Lowell A. Wilkins, 6 N. 256 Linden Ava, Roselle, Iii.
Filed Sept. 6, 1960, Sen N0. 54,039
1 Claim. (e1. its-as)
spindle 14. The ?lm 12 travels from right to left as
viewed in FIGURE 1, and is pulled from the supply reel
13 by a sprocket 16 driven by means of a motor 17. In
order to apply an adequate tension to the ?lm 12 as it
The present invention relates to an apparatus for con
is being unreeled, the supply reel 13 may be provided
with suitable braking means of the type well known in
ditioning motion picture ?lm and the like for the recep
tion of an adherent magnetic sound track.
In recent years, magnetic sound tracks on motion pic
the art.
The ?lm 12 then passes under a tensioning roller 18
and then over the periphery of a rigid idler roller 19
mounted ‘for rotation on a shaft 21.
While the ?lm 12 is supported on the movable idler
ture ?lm have begun to replace the optical sound tracks
which had heretofore ‘been used. The magnetic tracks
have the advantages of lower ‘cost and the ability to be
erased and edited, making them particularly useful for
roller 19, it is stripped along a predetermined width by
the home movie ?eld.
15 the action of one or more cutter teeth 22 mounted on a
Conventional motion picture ?lms provide only a very
mil-ling cutter 23. The cutter is mounted for periodical
limited area for the incoporation of a magnetic sound
track. This area exists ‘between the marginal edge of the
?lm and the edge of the sprocket holes. One of the main
problems in applying a magnetic sound track to motion 20
picture ?lm consists in securing uniformity of the mag
netic material in this very limited area in order to achieve
proper recording characteristics.
The magnetic sound track can be applied as a paint or
coating containing ?nely divided, magnetic iron oxide
(either a :gamma ferric oxide or ferrosoferric oxide) in
combination with a binder which may be a phenolic resin,
or a thermoplastic resin such as a vinyl resin. The binder
must be such that it resists the action of the developing
rotation on a shaft 24 and an indexing pin generally indi
cated at numeral 26 in the drawings is provided to peri
odically change the cutter tooth which is in engagement
with the ?lm 12, as the cutter tooth becomes worn.
The structure of the cutting mechanism is best illus
trated in FIGURE 2 of the drawings. As shown, the
?lm v1.2 is arranged to have two slits cut along side the
marginal edges thereof by the action of the opposed cut
ter teeth 22. This type of system will be used, for ex
ample, in removing two tracks simultaneously from a six
teen millimeter ?lm before the sixteen millimeter ?lm
is slit into two eight millimeter ?lms in accordance with
normal practice.
chemicals employed in the processing of the exposed mo 30
As shown in FIGURE 2, the idler roller 19 has two
tion picture ?lm.
raise-d peripheral surfaces 19a which support the edges of
It is particularly dif?cult to secure a magnetic sound
the ?lm 12 while the stationary cutter teeth 22 engage the
track to color ?lms and the like which contain an anti
?lm 12 and strip from it the two parallel bands upon
halation backing containing ?nely divided carbon par
which the magnetic sound track is to be incorporated.
ticles. The presence of this backing susbtantially inter 35 In order to eliminate the cuttings which result, I provide
feres with the ability of the resinous binder in the mag
a nozzle 27 attached to a vacuum cleaner or the like so
netic sound track to adhere to the ?lm ‘base. One of the
that the cuttings are removed substantially as fast as they
principle objects of the present invention is to provide
are formed.
‘an apparatus for continuously removing a predetermined
?lm 12, the ?lm
portion of such anti-halation layer to render the ?lm re 40 passes under a second tensioning roller 28, over a sec
ceptive to a subsequently applied magnetic sound track.
ond motor driven sprocket 29, and then the ?lm is wound
Another object of the present invention is to provide
up on a take-up reel 31 mounted for rotation on a spindle
an improved apparatus for stripping a band of predeter
32. The reel 31 may also be driven by the motor 17,
mined width from a ?lm without the use of any chemical
preferably by means of a slipping clutch arrangement so
that the tension on the ?lm 12 remains substantially uni
Another object of the invention is to provide an appara
form regardless of the amount of ?lm being wound up
tus for conditioning a motion picture ?lm for the recep
on the reel 31.
tion of a magnetic sound track in a continuous operation.
With the assembly of the present invention, the motion
Still another object of the invention is to provide a
picture ?lm is stripped continuously of materials which
simpli?ed, continuous machine for uniformly cutting a 50 would interfere with the adhesion of a magnetic sound
band of predetermined width from the anti-halation layer
track on the ?lm. The apparatus is also easy to main
of an unexposed motion picture ?lm.
tain, easy to install, and is inexpensive.
A further description of the present invention will be
It ‘will be evident that various modi?cations can be
made in conjunction with the attached sheet of drawings
55 made to the described embodiments Without departing
in which:
FIGURE 1 is a somewhat schematic view of an appa~
ratus employed in the practice of the present invention;
FIGURE 2 is a fragmentary cross-sectional view of the
cutter portion of the assembly.
from the scope of the present invention as set forth in
the claim.
I claim as my invention:
An apparatus for stripping a band of predetermined
width from a ?lm which comprises,
In the drawings, reference numeral 10 indicates gen 60
a supply reel for supplying ?lm at a substantially uni
erally a light-tight housing in which the ?lm stripping
form rate,
mechanism is housed. The housing 10 is provided with a
a rigid idler roller arranged to receive the ?lm there
removable cover 11 to permit access to ‘the interior.
a stationary cutter head in spaced relation to said idler
McClay _____________ __ Sept. 30, 1941
said cutter head including a plurality of peripherally
Peterson ____________ __ June 15, 1954
Cami-as _____________ __ Jan. 20, 1959
spaced cutter teeth,
and indexing means for selectively engaging one of 5
Weberling ____________ __ May 2, 1961
Great Britain ________ __ Nov. 17, 1920
said teeth with the ?lm on said idler roller to stripe
Said band‘therefrom-
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Thompson ____________ __ June 7, 1910Fisher ____ _‘_ _________ __ Apr. 22, 1941
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Great Britain __________ __ Sept. 7, 1955
Great Britain _________ __ June 11, 1956
Germany ———————————— -- Oct- 27: 1952
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