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Патент USA US2256899

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Sept‘. 23, 1941-
K. T. GREENWOOD
2,256,899
REEL-SUPPORTING MEANS FOR MOTION PICTURE PROJECTORS
Filed Dec. 26, 1939
2 Sheets-Sheet l
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K endoll
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_ Sept. 23, 1941.
K. T. GREENWOOD
2,256,899
REELQSUPPORTING MEANS FOR MOTION PICTURE PROJECTORS
Filed Dec. 26, 1959
2 ‘Sheets-Sheet 2
11/11/11. '11111; 7111114 .111
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Kendall TGreenwood
bymMzW
ATTys.
Patented Sept. 23, 1941
2,256,899
ATE/NT orrics
UNITED STATES
2,256,899
REEL- SUPPORTING IVIEANS FOR MOTION
PICTURE PROJEOTORS
Kendall '1‘. Greenwood, Sanford, Maine
Application December 26, 1939, Serial No. 310,874
6 Claims.
This invention relates to motion picture pro
jecting apparatus and it has for its general ob
ject to provide a novel device in the nature of
an accessory to a projector by means of which
it is possible to use reels of a much larger ca
pacity than that for which the projector is built.
Motion picture projectors using a 16 mm. ?lm
or an 8 mm. ?lm are commonly made to accom
(01. 242-55)
Fig. 1 is a side view of a device embodying
my invention, the motion picture projector it
self being shown in dotted lines.
,
Fig. 2 is a section on the line 2—2, Fig. 1, show
ing the base in plan view.
7
Fig. 3 is a section on the line 3-—3, Fig. 1.
Fig. 4 is a fragmentary view of the support
for the take-up reel and the motor for operat-‘
ing the same.
modate reels of a limited capacity, a ZlO'O-foot
reel usually being the maximum size of a reel 10
Fig. 5 is an enlarged sectionon the line 5-5,
which can be used on such projectors. This
Fig. 1.
means that if a long picture is to be shown,
In the drawings, there is shown in dotted lines
that is, a picture which will run for three-quar
at l a motion picture projector of any well
ters of an hour or an hour, it is necessary to di
kncwn make which is provided ‘with the reel
vide the ?lm between two or more reels. As a
supporting portion 2 having at its upper end
result, the showing of a picture of such length
a spindle 3 to receive the reel carrying the ?lm
on a projector having a limited reel capacity in
to be shown and also having at its lower end a
volves changing of reels in the middle of the pic
driven spindle 4 to receive the take-up reel.
ture, an operation which is often disconcerting
The projector I is also provided with the usual
to the audience viewing the picture.
?lm-feeding means in the form of the driven
As stated above, it is one of the objects of
sprocket wheels 5 and 5 together with means for
my present invention to provide a novel device
giving the ?lm its intermittent motion as it
to be used in connection with a projector hav
passes the lens.
ing a limited reel capacity and by means of which
My improvement comprises a base member or
a reel of much larger capacity than that for
support ‘I on which the projector I is adapted
which the projector is built can be shown con
to be mounted,‘ and this base, or support ‘I is
tinuously and without any interruption such as
provided with a reel support adapted to receive
would be involved in changing reels.
a reel 8 of large capacity and to deliver the ?lm
My improvements comprise a suitable base‘
9 from said reel to the ?lm-feeding mechanism
adapted to support a motion picture projector
of the projector I. Said base or support is also
and provided with means to support a large
provided with means for mounting a take-up
capacity reel in position to deliver the ?lm to
reel ID of large capacity onto which the ?lm
the film-feeding, mechanism of the projector,
9 is wound after it has been fed through the
and also provided with means for supporting and
projector, and with means separate from the pro.
operating a large capacity take-up reel designed
to receive the ?lm from the projection appara
tus, the means for operating the take-up reel
being separate structurally from and independent
of the projector.
jector I for operating the take-up reel 10.
The base ‘I may have any suitable construction
but it is provided with an upper surface I! on
which the projector I may rest, suitable means
hereinafter described being provided for clamp
The use of the device embodying my inven 40 ing the projector on the base. The large ca
tion for showing a long picture continuously
pacity reel 8 carrying the ?lm 9 to be exhibited,
and without interruption does not involve any
is shown as mounted on a supporting arm I2
change in the structure of the projection appa
which rises from the front end of the base ‘I.
ratus, so that by means ‘of my invention it is
This arm I2 is provided at’ its upper end with
possible to show without interruption the pic
a spindle I3 to receive the reel, and said arm
ture on an 800-foot reel or a 1200-foot reel, or
is preferably made adjustable as to its length
even a larger reel, with a motion picture pro
and is also pivotally mounted so that it can be
jector which is built for a. reel of maximum ca
swung forwardly or backwardly. In the present
pacity of, say, 400 feet.
embodiment of the invention, the arm is car
In order to give an understandingv of the in
ried by a bracket I4 which is secured to the
vention, I have illustrated herein a selected em
base II by means of suitable clamping screws
bodiment of the invention which will now be de
l5. The lower end of the arm i2 is pivotally
scribed, after which the novel features will be
connected to the supportingrbracket M by means
pointed out in the appended claims.
of a friction pivotal mounting‘. The upper end
In the drawings:
’ of the bracket arm I4 is formed with the rounded
2,256,899
portion I6 which carries a pivot screw I‘! that
extends through the rounded portion l8 on the
lower end of the arm [2, said screw having a
clamping nut l3 screw-threaded thereto. When
the clamping nut is loosened, the arm 12 can be
ing wedges 43, one for each clamping member,
said wedges operating in slots 44 that open at
one side into the recess 4| in which the clamp
ing members are received, the other side of each
slot having the inclined face 45. When the
clamping member is in adjusted position, an
advancing movement of the corresponding wedge
43 looks the clamping member in such adjusted
position. Conversely, a retracting movement of
Said arm I2 is ex 10 either wedge will release the clamping member
swung baokwardly or forwardly, and by tighten
ing the clamping nut I9, the two faces of the
rounded parts 16 and I8 will be clamped to
gether, thereby frictionally holding the arm l2
at any adjusted position.
tensible as to its length and comprises the two
telescopic sections 28 and 2|, the section 28
so as to permit it to be adjusted in the recess 4|.
For advancing or retracting the Wedges 43, I
have provided two actuating screws 46, one for
each wedge, which are screw-threaded into the
the section 20 so as to prevent one section from 15 base, each screw having a ?ange 41 thereon
telescoping into the section 2|, and the latter
having a key 22 operating in a keyway 23 in
turning on the other. 24 is a set screw carried
by a collar 25 on the lower end of the arm sec
which operates in a recess or notch 48 formed
in the edge of the wedge. As the screws 46 are
advanced or retracted, the engagement of the
tion 2|, said screw providing means for locking
?anges 41 in the notches 48 will correspondingly
the two arm sections 20 and 2| in any relative
adjusted position. This arm I2 is so mounted 20 advance or retract the wedges, thereby looking or
unlocking the clamping member.
on the base ‘I that it will deliver its ?lm 9 prop
The base 1 is provided with control switches
erly to the ?lm feeding mechanism of the pro
jeotor.
,
1
The large capacity take-up reel I8 is mounted
for controlling the operation of the projector l,
and the operation of the motor 28 for the take
on a post or support 26 rising from the base 1 25 up reel. Current is supplied to these switches
in the rear of the projector I, said post 28 carry
through a suitable cable connection 49 and. the
ing at its upper end a driven spindle 21 on which
switch for controlling the motor 28 for the take
the take-up reel may be removably placed. This
up reel is indicated at 58. 5| indicates a sepa
take-up reel I8 is driven by a motor 28 which is
rate switch which is connected by suitable cord
separate and independent from the projector I, 30 or cable 52 to the usual terminal connection
said motor being carried on the upper end of
the post 26 and being connected to the spindle
2'! by any suitable driving means.
As herein shown, the motor is provided with
for the projector I. The circuit wires in the
cable 48 lead to the switches 50 and 5|, and the
construction is such that by operating the switch
5!, the projector will be set in operation, and
a shaft 1| which is connected to the spindle by 35 by operating the switch 50, the motor 28 for the
take~up reel will be set in operation.
driving pulley 30 on the shaft ‘H and a driven
52 is a reversing switch connected in the cir
pulley 3| carried by the spindle 21. The motor
cuit in a well-known Way, and by means of
28 will be provided with suitable reducing gear
which the motor 28 may be reversed when it is
to provide a proper speed of rotation of the 40 desired to rewind the ?lm onto the reel 8. This
shaft ‘H.
is done according to the usual practice of plac
Means are provided for guiding the ?lm in
ing the empty reel 8 on the spindle 21 and the
its travelling movement from the projector l
?lled take-up reel in on the spindle l3 and then
to the take-up reel l0, and in the construction
operating the motor 28 through the reversing
illustrated, such guiding means comprises two 45 switch to rewind the ?lm directly from the take
guide rolls 32, 33 which are carried by the base
up reel l0 back onto the reel 8.
and around which the ?lm 9 passes. These
The manner in which the device is used will
guide rolls 32, 33 are located below the upper
be obvious from the foregoing description. The
surface of the base and the latter is provided in
projector l is placed on the base ‘I and clamped
one side with an open slot 34 (see Fig. 3) through 50 in position, and the large capacity reel 8 con
which the ?lm passes in its movement from the
taining the ?lm to be exhibited is applied to the
guide roll 32 to the guide roll 33. The base is
spindle l3 and the empty take-up reel is placed
formed with the two open recesses 35 in which
on the spindle 21. The ?lm 9 from the reel 8
the guide rolls 32 and 33 are located. Each guide
is then threaded through the ?lm-feeding mech
roll is preferably yieldingly mounted and this 55 anism of the projector l as usual, and as illus
may be provided for by rotatably mounting each
trated in Fig. 1, and said ?lm is passed’ around
roll on a supporting arm 36‘ which is pivotally
the guide roll 32 and threaded through the slot
mounted at 31 and is acted on‘ by a suitable
34 and passed around the guide roll 33, and the
spring 38 that provides for a yielding movement
end of the ?lm is fastened to the take-up reel
of the roll.
60 ID in the usual manner. The operator then
means of an elastic belt 29 that passes around a
While any suitable means for clamping the
projector I on the base 1 may be employed, I
have herein shown a clamping device compris
throws the switches 58 and 5|, thereby setting
both the projector l and the motor 28 for the
take-up reel in operation. The motor 28 is de
ing two clamping members 39, 40, which are
signed to operate the take-up reel at the proper
slidably mounted in a dovetail recess 4| that 65 speed to wind the ?lm thereon as fast as it is
extends across the top of the base 1. Each
fed through the projector, the yieldingly mount
clamping member 39, 48 has at its outer edge
ed guide rolls 32, 33 providing sufficient yielding
an upstanding rib 42 adapted to engage the
movement to prevent any breakage of the ?lm.
edge of the bottom or base of the projector I.
The driving means between the motor 28 and
These clamping members 39, 40 can be moved 70 the take-up spindle 2'! provides for the neces
toward and from each other, and will thus ac
sary slippage to occur so that the ?lm will never
commodate projectors of different sizes. While
be under too great a tension.
any suitable means may be employed for locking
Because of the fact that the reels 8 and I 0
each clamping member in its adjusted position,
are mounted independently of the ‘projector, it
I have herein shown for this purpose two lock 75 is possible to use reels of a capacity as large as
3
2,256,899
1,600 feet, if necessary, and to run the picture
on these reels continuously through a projector
which was built to have a limited reel capacity.
I claim:
-
1. A motion picture projector accessory com
prising a supporting base adapted to removably
support a motion picture projector having the
usual reel-supporting means, ?lm-feeding mech
liver its- ?lm to the ?lm feeding mechanism of a
projector mounted on the base, a second upstand
ing arm at the rear of the base, a spindle for a
_|take-up reel mounted on said second arm,>and a ' ~
motor mounted on said second arm and separate
from the projector for operating said take-up
spindle.
‘
r
'
5. A device of the class described comprising a
supporting base adapted to removably support
anism and means to actuate the latter, means
carried by the supporting base to support a sup 10 a motion picture projector having the usual reel
supporting portion and the usual ?lm-feeding
ply reel in position to deliver its film to the ?lm- '
mechanism and means to actuate it, means on the
feeding mechanism of such a projectorisupported
base for clamping the projector thereto, an up
on said base, means'also carried by “said base
standing reel-supporting arm at the front of the
for supporting a take-up reel, both of said means
being separate from the reel-supporting means 1,5 base and adapted to support a supply reel in po
of the projector and means separate from said ' sition to deliver its ?lm to the ?lm-feeding mech
anism of a projector mounted on thebase, a
projector and its ?lm-feeding mechanism for ro
second upstanding arm at the rear of the base,
tating the take-up reel to wind the ?lm thereon.
both of said arms being separate from thereel
2. A motion picture projector accessory com
prising a supporting base adapted to removably 2O supporting portion of the projector, a spindle for
support a motion picture projector having the
usual reel-supporting means, ?lm-feeding mech
a ‘take-up reel mounted on said second arm, and‘
a motor mounted on said second arm for driving
the take-upvspindle, said motor being separate
anism and means for actuating the latter, means
and independent from the ?lm-feeding means
carried by the base to support a reel in position
‘
a
to deliver its ?lm to the ?lm-feeding mechanism 25 and its actuating mechanism.
6. A device of the class described comprising a
of such a projector supported on said base, means
supporting base adapted to removably support a
also carried by said base for supporting a take
motion picture projector having the usual reel
up reel at the rear of the projector on the base,
supporting portion to hold a supply reel and a
both of said means being separate from the reel
take-up reel, and also having the usual ?lm
supporting means of the projector and means
feeding mechanism and means to actuate it.
separate from the projector and its ?lm-feeding
means on the base for clamping the projector
mechanism for rotating the take-up reel to wind
thereto, an upstanding reel-supporting arm at
the ?lm thereon.
the front of the base separate from the reel-sup
3. A motion picture projector accessory com
prising a supporting base adapted to removably 35 porting portion of the projector and adapted to
support a motion picture projector having the
usual reel-supporting means, ?lm-feeding mech
anism and means for actuating the latter, means
carried by the base to support a reel in position '
support a supply reel in position to deliver its
?lm to the ?lm-feeding mechanism of such a pro
jector mounted on the base, and a second ‘up
standing arm at the rear of the base also separate
to deliver its ?lm to the ?lm-feeding mechanism 40 from the ?lm-supporting portion of said pro
jector, a spindle for a take-up reel mounted on
of said projector, an arm carried by said base in ,
said second arm, a motor also mounted on said
the rear of the projector mounted thereon for
second arm for driving thetake-up spindle, said
supporting a take-up reel, means mounted on said
motor being separate and independent from the
arm and separate from said projector for rotat
?lm-feeding mechanism of the projector, said
ing the take-up reel to wind the ?lm thereon,
base having a ?lm-receiving passage extending
and yieldingly mounted guide rolls carried by
from the front to the back thereof below the por
the base and serving to guide the ?lm in its trav
tion on which the projector is mounted, and
elling movement from the projector to the take
through which passage the ?lm moves in travel
up roll. '
4. A device of the class described comprising 50 ling from the supply reel to the take-up reel, and
a supporting base adapted to removably support
yieldingly mounted guide rolls carried by the base
a motion picture projector, means on the base
and serving to guide the ?lm while moving through i
said passage.
KENDALL 'I'; GREENWOOD.
for clamping the projector thereto, an upstand
ing reel-supporting arm at the front of the base
and adapted to support a reel in position to de 55
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