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Патент USA US3029692

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April 17, 1962
H. BERNZOTT
3,029,686
SELF‘ THREADING MOTION PICTURE PROJECTOR
Filed May 23, 1958
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April 17, 1962
H, BERNZOTT
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SELF THREADING MOTION PICTURE PROJECTOR
Filed May 23, 1958
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H. BERNZOTT
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Filed May 23, 1958
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SELF THREADING MOTION PICTURE PROJECTOR
Filed May 23, 1958
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SELF THREADING MOTION PICTURE PROJECTOR
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SELF THREADING MOTION PICTURE PROJECTOR '
Filed May 23, 1958
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April 17, 1962
H. BERNZOTT
3,029,686
SELF THREADING MOTION PICTURE PROJECTOR
Filed May 23, 1958
8 Sheets-Sheet 7
INVENTOR.
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April 17, 1962
H. BERNZOTT
3,029,686
SELF THREADING MOTION PICTURE PROJECTOR
Filed May 23, 1958
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United States Patent 0
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3,029,686
Patented Apr..17, 1962
2
FIGURE 13 is a horizontal sectional view, at an en
7
larged scale, taken generally along the line 13-13 of
FIGURE 3;
3,029,686
SELF THREADING MOTION PICTURE
.
PROJECTOR
Hugo Bernzott, Niles, Ill., assignor to Bell
FIGURE 14- is a view, in side elevation, of the upper
IIowell 5 operating
lever;
Company, Chicago, 111., a corporation of Illmors
Filed May 23, 1958, Ser. No. 737,429
9 Claims. (Cl. 88-17)
FIGURE 15 is a view, in side elevation, of the lower
operating lever;
FIGURE 16 is a view, in side elevation, of an adjust
This invention relates, generally, to motion picture pro
ing bracket that is carried by the lower operating lever;
jectors and it has particularly relation to self threading 10 FIGURE 17 is a view, in side elevation, of a latch lever
motion picture projectors.
which cooperates with the bracket shown in FIGURE 16
to hold it and the operating linkage for the upper and
Among the objects of this invention are: To provide
for self threading ?lm in a motion picture projector in a
new and improved manner; to form ?lm loops of the
required size above and below the projection aperture; to
move the ?lm. loop forming means out of ?lm loop form
ing position when the ‘?lm has been threaded through the
projector; to provide upper and lowerv?lm loop formers
lower loop formers in the self threading positions;
FIGURE 18 is a view, in front elevation, of the aper
ture plate with certain elements of the projector mecha
nism mounted thereon;
FIGURE 19 is a vertical elevational view of the pres
sure plate which, in operative position, is located imme
diately in front of the aperture plate shown in FIG
and operating mechanism for conjointly operating them;
to provide for manually moving the upper and lower ?lm 20 URE 18;
loop formers into ?lm loop forming positions and for
FIGURE 20 is a horizontal sectional view taken gen
automatically moving them away from such positions
erally along the line 20-20 of FIGURES 5 and 18;
after the ?lm has been threaded through the projector;
FIGURE 21 is a horizontal sectional view taken gen
to prevent threading of the lead end of the ?lm through
erally along'the line 21-21 of FIGURE 18 and includ
the projector unless the loop formers are in their ?lm 25 ing a showing of the pressure plate; and
loop forming positions; to restore‘ the upper and lower
FIGURE 22 is a top plan view of a ?lm cutter that
?lm loops during operation of the projector in the event
is provided on the base of the projector in order to cut
that such action may be required; to bias the upper and
the lead end of the ?lm so as to insure that the mecha
_ lower ?lm loop formers away from their loop forming
nism can automatically thread it through the projector.
positions; to latch the upper and lower ?lm loop formers 30
Referring now particularly to FIGURE l'of the draw
in their loop forming positions and to unlatch them on
ings, it will be observed that the reference character 10
completion of the threading operation; and to provide for
adjusting the relation between the operating mechanism
interconnecting the upper and lower ?lm loop formers and
designates, generally, a motion picture projector which
includes a base. 11 and a support or upstanding frame
plate 12 on which a ?lm reel 13 is mounted carrying a
the latch mechanism in order to accommodate manufac~ 35 ?lm 14 which is to be displayed. The ?lm reel 13 is
rotatably mounted at 15 on the support or upstanding
turing tolerances.
Other objects of this invention will, in part, be obvious
frame plate 12 and, after being fed through the project~
and in part appear hereinafter.
This invention is disclosed in the embodiment thereof
ing mechanism to be described, is trained over guide
pulleys 16 and 17 on the support or upstanding frame
shown in the accompanying drawings and it comprises
the features of construction, combination of elements and
plate 12 near the bottom thereof and thence over a take
up‘, reel 18 which is rotatably mounted at 19 on an arm
arrangement of parts that will be exempli?ed in the con
struction hereinafter set forth and the scope of the appli
cation of which will be indicated in the appended claims.
20. It will be understood that the ?lm 14 is unwound
from the ?lm reel 13 and, after. having been displayed,
is wound on the take up reel 18.
A carrying handle 21
‘ For a more complete understanding of the nature and 45 is secured to the upper end of the support or upstanding
scope of this invention reference can be had to the fol
frame plate, 12 to facilitate movement of the projector
lowing detailed description, taken together with the ac
10.
companying drawings, in which:
Conductors 22 are arranged to connect the electri
cally driven and energized parts of the motion picture
FIGURE 1 is a view, in side elevation, of a motion
projector 10 to a suitable source of current such as a
picture projector in which the present invention is em 50 115 volt 6O cycle source. It will be understood that the
bodied, the cover having been removed in order to make
conductors 22 connect a drive motor and a projection
visible certain of the operating parts;
.
lamp for energization to the source.
- FIGURE 2 is a View, at an enlarged scale, showing in
The projection lamp which is specially designed and
side elevation the self threading mechanism in opera
may have a rating of 500 watts is located in 1a lamp house
tive position, the linkage interconnecting the loop formers 55 23. The operating motor and lamp in the lamp house 23
being shown by broken lines;
are arranged to be energized by a switch which is shown,
FIGURE 3 is a View, similar to FIGURE 2, but show
ing the upper and lower loop formers in inoperative po
sition with the ?lm having been threaded through the
projector;
FIGURE 4 is a vertical sectional view, at an enlarged
generally, at 24. The switch 24 has an “oif" position in
which a handle 25 is in a lowermost position as shown
in FIGURE 2. of the drawings. In the central position
60 of the switch 24, as shown in FIGURE 1, only the drive
scale, taken generally along the line 4-4 of FIGURE 2;
FIGURE 5 is a view, partly in side elevation and -
motor is energized. When the control member or handle
25 is in the upper position, shown in FIGURE 3, both
the drive motor and the projection lamp are energized.
partly in section, taken along'the line 5-5 of FIG
As described hereinafter, advantage is taken of the dif~
URE 4;
65 ferent positions of the control member or handle 25 for
FIGURE 6 is a sectional view, similar to the upper
portion of FIGURE 5 and showing the upper ?lm loop
former in the retracted position where threading of the
?lm is prevented;
'
FIGURES 7, 8, 9, 10, 11 and 12 are sectional views
taken, respectively, along the lines ‘7-7, 8-8, 9-9,
10-10, 11-11 and 12-12 of FIGURE 5;
effecting movement of the upper and lower ?lm loop
formers to the inoperative positions after the ?lm 14
has been threaded through the projector.
Immediately in front of the lamp house 23 is a shuttle
housing 26 on which an aperture plate 27 is mounted.
In front of. the aperture plate 27 there is a lens barrel
support 28 which is pivoted at 29‘ on the’shuttle housing
3,029,686
3
4
26 and which carries a pressure plate 31 between which
and the aperture plate 27 the ?lm 14 is fed as will be
an upper ?lm loop former 61.
understood readily.
Extending forwardly from the shuttle housing 26 and
cular section 63 which, in the position shown in FIG
URE 5 of the drawings, is concentric with the upper
?lm sprocket 35. This is the self threading position of
the upper ?lm loop former 61 and the concave circular
section 63, in combination with depending sides 64 and
65, FIGURE 9, serve to guide the ?lm 14 over the upper
?lm sprocket 35.
mounted on the support or upstanding frame plate 12 is
a mechanism plate 34. In the claims the support or
upstanding frame plate 12 and the mechanism plate 34
are [referred to as a “support.” For convenience in man
ufacturing the mechanism plate 34 is fabricated sepa
The upper ?lm loop
former 61 has an intermediate concave downward cir
It is desirable that means he provided for preventing
rately from the support or upstanding frame plate 12 and 10
the self threading of the ?lm 14 in the event that the
is secured thereto to proide a unitary construction.
As shown in FIGURES l, 2, 3 and 4 of the drawings
an upper ?lm sprocket 35 is rotatably mounted on the
mechanism plate 34. Directly below and spaced from
upper ?lm- loop former 61 is in the inoperative position
shown, for example, in FIGURE 6. Here it will be
observed that the upper ?lm loop former 61 is provided
the upper ?lm sprocket 35 there is a lower ?lm sprocket 15 with a depending tongue 66 which is arranged to inter?t
with the central groove 60, FIGURE 8, in the guide
36. The upper and lower ?lm sprockets 35 and 36 are
roller 58, when the upper ?lmloop former is in the opera
secured to and rotate with upper and lower shafts 37 and
tive position. When the upper ?lm loop former 61 is in
38 which are rotatably mounted in upper and lower bear
the retracted position shown in FIGURE 6, the lead end
ings 39 and 46, respectively, that are carried by the mech
anism plate 34. It will be understood that the upper 20 67 of the ?lm 14 is directed centrally against the guide
roller 58 and is lifted above the teeth of the upper ?lm
?lm sprocket 35 is directly above the lower ?lm sprocket
sprocket 35 thereby preventing any further automatic
36 and that both are spaced from the ‘aperture plate 27.
threading of the ?lm 14.
With the upper ?lm loop ‘former 61 in the operative
bearings 39 and 4t), -respectively,vfor a purpose to be de
25 position, shown in FIGURE 5, the automatic threading
scribed hereinafter.
of the lead end 67 of the ?lm 14 continues. The lead
Any suitable mechanism can be employed for driving
end 67 is fed underneath the guide roller 58 and past a
the upper and lower ?lm sprockets 35 and 36. For ex
?ange 68 which extends into a groove in the upper ?lm
ample, upper and lower gear wheels 43 and 44 can be
secured to the ends of the shafts 37 and 38, respectively, ' sprocket 35. The lead end 67 of the ?lm 14 then is
which extend through the mechanism plate 34. A worm 30 directed along an arcuate surface 69 on the upper ?lm
guide bracket 49 and over the convexly curved upstand
45, driven by the operating motor, is employed for con
ing section 55. The lead end 67 of the ?lm 14 is guided
jointly driving the gear wheels 43 and 44 as will be under
in its movement over the section 55 by a concave down
stood readily. The worm 45 is driven by the electric,
ward loop forming surface 70 that is provided on the
drive motor, referred to hereinbefore, which also is ar
ranged to drive the take up reel 18 and, under certain 35 underside of the upper ?lm loop former 61. The de
Hubs 41 and 42'are formed on the upper and lower
conditions, to drive the ?lm reel 13 for rewinding pur
pending sides 64 and 65 extend substantially the entire
length of the upper ?lm loop ‘former 61, as shown in
FIGURES 7, 8 and 9 of the drawings, and thus serve
for self threading the ?lm 14 over the upper ?lm sprocket ' to guide the lead end '67 of the ?lm 14 along the path
35, between the aperture plate 27 and pressure plate 31 40 just described. The concave downward loop forming
surface 70 is effective to form an upper ?lm loop 71
and over the lower ?lm sprocket 36. It is desirable that
whence the lead end 67 is directed downwardly past the
loops in the ?lm 14 be' formed above and below the aper
upstanding section 55 and between the aperture plate
ture plate 27 in order to permit projection of the images
27 and the pres-sure plate 31. The upper surface of the
on the ?hn properly. For this purpose upper and lower
?lm loop forming means 47 and 48 are provided as 45 upper ?lm loop former 61 above and to the left of the
loop forming surface 70 is knurled as indicated at 72.
shown more clearly in FIGURE 5 of the drawings. Since
to facilitate the movement of the upper ?lm loop former
the upper and lower ?lm loop forming means 47 and 48
61 to the ?lm loop forming position.
are different in construction, each will be described in
The lead end 67 of the ?lm 14 is fed downwardly after
dividually.
The upper ?lm loop forming means 47 includes an 50 the upper ?lm loop 71 is formed in front of the aperture
plate 27 which is mounted on the shuttle housing 26.
upper ?lm guide bracket 49 that may be formed of metal
FIGURE 18 shows the aperture plate 27 and reference
or suitable plastic. The upper ?lm guide bracket 49 is
poses.
~
In accordance with this invention provision is made
now will be had to it in connection with the illustrations
secured to the mechanism plate 34 by a screw 50 and
in FIGURES 19, 20 and 21. In order to avoid contact
also by a screw 51, FIGURE 9, which has a shaft or
bearing portion 62 on which an entrance guide roller 55 with the image carrying portion of the ?lm 14 a longitu
52 is rotatably mounted. Referring again to FIGURE
5 of the drawings, it will be observed that the upper
?lm guide bracket 49 is provided with a horizontal up
wardly facing shelf 53 the left end of which is directly
underneath the entrance guide roller 52. Intermediate
dinal groove 74 is provided in the aperture plate 27.
FIGURES 20 and 21 show the relationship of the groove
74 to the image carrying portion of the ?lm 14. The
aperture plate 27 is secured to the shuttle housing 26
by screws 75 and 76'. A raised portion 77 is formed
along one side of the groove 74 and perforations 78,
FIGURE 10, in the ?lm 14 move therealong and past a
shuttle tooth slot 79 through which a shuttle tooth 80,
FIGURE 5, projects. It will be understood that the
65 shuttle tooth St) is driven in timed relation with respect
the ends of the ‘upper ?lm guide bracket 49 there is a
concave upward circular section 54 which is concentric
with the upper ?lm sprocket 35 and extends above the
axis of rotation of the shaft '37 on both sides. To the
left of the upper ?lm sprocket 35 the upper ?lm guide
bracket 49 is provided with a convexly curved upstanding
, to the upper and lower ?lm sprockets 35 and 36 by the
section 55 which has a laterally extending vertical shoul—
motor which drives the worm 45 in accordance with
der 56 that extends into a slot 57, FIGURE 18, in the
conventional practice to advance the ?lm 14 in a stepwise
aperture plate 27. The construction also is shown in
fashion past a projection aperture 81 at the bottom of
FIGURE 20. A guide roller 58 is rotatably mounted on 70 the groove 74.
a shaft 59, FIGURE 8, which extends from the upper
With a view to locating the ?lm 14 as it moves down
?lm guide bracket. The guide roller 58 has a central
wardly past the projection aperture 81 a guide bar or
groove 66 for a purpose that will be apparent presently.
shoulder providing means 82 is secured by the screws 75
Rockably mounted on the shaft portion 62 of the screw
in overlying relation to the aperture plate 27. The edge
51, as shown in FIGURES 5 and 9 of the drawings, is
of the ?lm 14 along which the perforations 78 are located
3,029,686
5
is guided by a shoulder 83 on the guide bar 82.
The
?lm 14 is lightly held against the shoulder 83 by exten
sions 84 which bear against the opposite edge of the ?lm
v14 and are carried by a side tension arm ‘85 having a
central slot 86 which is movable with respect to a pin 87
that stands outwardly from the aperture plate 27.
A
7 spring 88 reacts between the pin 87 and the ends of the
side tension arm 85 to bias the extensions 84- lightly
6
FIGURE 3. For this purpose upper and lower operating
arms 113 and 114 are provided on the upper and lower
loop formers 61 and 106 respectively. It will be observed
in FIGURES 8 and 11 that the upper and lower operat
ing arms 113 and 114 project, respectively, through slots
115 and 116 in the mechanism plate 34.
FIGURES 2, 3 and 4 show, generally, ‘at 117 operating
means located in the rear of the support or upstanding
against the adjacent edge of the ?lm 14. In this manner
frame plate 12 and mechanism plate 34- for effecting
the ?lm 14 is held ‘against the shoulder 83 ‘and located 10 conjoint operation of the upper and lower ?lm loop
accurately with respect to the aperture 81.
formers 6'1 and 106. FIGURES 13 to 17 inclusive show
Referring particularly to FIGURES 5, l9 and 21, it
the details of construction of the operating means 117.
will be observed that projections 89 extend upwardly and
It will be observed that an upper operating lever 118,
downwardly from the lens barrel support 28 for support
FIGURES 8 and 14, is provided having a slot 119 in its
ing the ends of the pressure plate 311. A leaf spring 90 ‘ upper end for inter?tting with the ‘adjacent end of the
urges the pressure plate 31 toward the aperture plate 27
upper operating arm 113. Adjacent the slot 119 there is
with the ?lm 14 being located therebetween. Pins 91
an ‘aperture 126 for receiving one end of a tension spring
extending rearwardly from the lens barrel support 28 act
121, FIGURE 2, the other end of which is secured at 1212
to secure the ends of the spring 90 in tensioned relation
on the mechanism plate 34. Intermediate the ends of
to bias the pressure plate 31 toward the aperture plate 27 . 20 the upper operating lever 118 is a central circular open
A projection aperture 92 is provided centrally lengthwise
of the pressure plate 31 to register with the projection
aperture 81 in the aperture plate 27. The projection
aperture 92 is located at the bottom of a groove 93 which
extends longitudinally of the pressure plate 31.
The
‘ ing 123 that is arranged to rotate on the hub 41 of the
upper bearing 39 as shown more clearly in FIGURE 8
of the drawings. At its lower end the upper operating
lever 118 is provided with a slot 124 for sliding engage
rnent with an arm 125 that extends upwardly from a
groove 93 is complementary to the groove 74 in the aper
lower operating lever, shown generally at 126 in FIG
ture plate 27 and is provided to avoid contact with the
URE l5, and having a central slotted opening 127 that
image carrying portion of the ?lm 14.
>
is arranged to rotate on a hub‘ 42, FIGURE 4, which, as
Near the lower end of the aperture plate 27, as shown
indicated hereinbefore, is formed on the lower bearing
in FIGURE 18, there is a slot 96. It is provided to 30 49. Near the lower end of the lower operating lever 126
receive a shoulder 97, FIGURE 5, of a lower ?lm guide
is a slot 128 for receiving the lower operating arm 114
bracket 98 which forms a part of the lower ?lm loop
which extends laterally from the lower ?lm loop former
forming means 48‘ referred to hereinbefore. The lower
166. This construction is shown more clearly in FIG
?lm guide bracket 98 can be formed of‘metal or plastic
URE 11. The operating means 117, comprising the up
as may be desired. It is held in place on the mechanism 35; per and lower operating levers 118 and 126, biased by the
plate 34 by screws 99 and 106, the latter being shown in
tension spring 121 functions to hold the upper and lower
FIGURE 12. The lower ?lm guide ‘bracket 98 is pro
?lm loop formers 61 and 1116 out of the loop forming
vided with a convexly curved depending section 101
positions as shown in FIGURE 3 of the drawings.
which corresponds to the upstanding section 55 on the
In order to accommodate manufacturing tolerances
upper ?lm guide bracket 49. Concentric with the lower
with respect to the upper and lower operating levers 118
?lm sprocket 36 is an intermediate concave downward
and 126 and the parts on which they are mountd and
section 102 which overlies the sprocket 36 ‘and insures
that the lead end 67 of the ?lm 14 is properly directed
to ‘an exit guide roller 103 whence the ?lm 14 is trained
with which they cooperate,’ the lower operating lever 126
is provided with the slotted opening 127 and is arranged
to receive a bracket 131, FIGURE 16, which is provided
around the guide pulley 16, FIGURE 1, previously re
with a central circular opening 132 for close ?tting en
ferred to. It will be observed that the guide roller 163
gagement with the hub 42, FIGURE 4, on the lower
is rotatably mounted on a shaft portion 104 of the screw
bearing ‘40. At the ends of the bracket 131 slots 133
1110 as shown in FIGURE 12.
are provided which overlie threaded openings 134 at
Cooperating with the lower ?lm guide ‘bracket 98 and
the upper and lower ends of the lower operating lever
corresponding to the upper ?lm loop former 61 is a lower 50 126, FIGURE 15. Through the provision of the central
?lm loop former 106 which is rockably mounted on the
slotted opening 127 in the lower operating lever 126
shaft portion 104 of the screw 199‘ as shown more clearly
and the slots 133 in the bracket 131, suitable adjustments
in FIGURE 12. At its swinging end the lower ?lm loop
can be made to eliect proper operating relationship be
former 106 has a concave upward ?lm loop forming
tween the upper and lower operating levers 118 and 126
surface 107 with upstanding sides 168 and 109 as shown 55 together with the upper and lower ?lm loop formers 61
more clearly in FIGURES l0 and 11. A lower ?lm
and 196. Screws 135, FIGURE 4, extend through the
loop 110-‘ is formed by the passage of the lead end 67 of
slots 133 and into the threaded openings 134 for secur
the ?lm 14 over the loop forming surface 167 and it
ing the bracket 131 in proper position on the lower operat
directs the ?lm 14 upwardly over the lower ?lm sprocket
ing lever 126 with the slot 127 therein permitting its rel
36. The lower ?lm loop former 196 has an intermediate 60 ative adjustment with respect to the hub 42. Once the
concave upward circular section 111 which is concentric
proper relationship has been established between the upper
with the lower ?lm sprocket 36 when the lower ?lm loop
and lower operating levers 118 and 126 with the bracket
former 106 is in the loop forming position.
'
131 secured thereon, the bracket 131 and the lower operat
ing lever 126 function as a single unit and ordinarily this
It will be understood that the upper ?lm loop former
relationship, once established, need not be subsequently
61 and the lower ?lm- loop former 106 can be formed of
disturbed.
metal or plastic as may be desired. They can be formed
In order to hold the upper and lower ?lm loop formers
of the same or different materials as described for the
61 and 166 in the ?lm loop forming positions shown in
upper ‘and lower ?lm guide brackets 49 and 98.
FIGURE 2 of the drawings a detent 136 is formed in
It is desirable to operate the upper and lower ?lm loop
formers 61 and 106 to free the upper and lower ?lm 70 tegrally with the bracket 131 as shown more clearly in
loops 71 and 119. For this purpose provision is made
for swinging the upper and lower ?lm loop formers 61
and 166 out of the loop forming positions shown in FIG
URES 2 and 5 of the drawings to the positions shown in
FIGURES l2 and 16 of the drawings. Cooperating with
the detent 136 is a latch hook 137 that is located at the
upper end of a latch lever 138, FIGURE 17, which is pro
vided with an intermediate circular opening 139 to re
ceive a bolt 140,, FIGURE 13, which extends ‘through
3,029,686
7
operating levers 118 and 126, the lower ?lm loop former
1116 is moved upwardly. The upper and lower ?lm loop
the mechanism plate 34. In this manner the latch lever
13% is rotatably mounted intermediate its ends on the
bolt 140. The upper arm of the latch lever 138 is pro
vided with an aperture 141 for receiving one end of a
tension spring 142, FIGURE 2, that is hooked into an
aperture 143 in the mechanism plate 34 at the other end.
The tension spring 142 acts to bias the latch lever 138
positions shown in FIGURES l, 2 and 5 of the drawings
by the engagement of the latch‘hook 137 with the detent
end section 147 which extends into the path of movement
of the control member or handle 25 which is movable
with the conventional reciprocatory movement. The
teeth on the upper ?lm sprocket 35 engage the perfora
the upper and lower ?lm loops 71 and 110, thereby leav
wardly past the upper extension 84 of the side tension
arm 85, the projection aperture 81 and the perforations
formers 61 and 106 are latched in the film loop forming
136 on the bracket 131 as shown in FIGURE 2. After
the operator has made sure that the lead end 67 of the
?lm 14 is properly cut, as by cutting off the section 155
in a direction to hold the latch hook 137 in latching en
by the ?lm cutter 150, the lead end 67 is placed on the
gagement with the detent 136, thereby holding the upper
and low ?lm loop formers 61 and 1&6 in the ?lm loop 10 shelf 53 and is moved underneath the entrance guide
roller 52. The control member or handle 25 is moved
forming positions shown in FIGURE 2. As shown in
to the “motor” position where the drive motor is ener
FIGURE 13 the latch lever 138 has an operating arm
gized to rotate the Worm 45, FIGURE 4, and drive the
144 with an intermediate section 145 that extends through
upper and lower gear wheels 43 and 44. The upper and
a slot 146 in the support or upstanding frame plate 12
as shown more clearly in FIGURES 1, 2 and 3 of the 15 lower ?lm sprockets 35 and 36 then are rotated in a
?lm feeding direction and the shuttle tooth 81! is moved
drawings. As there shown the operating arm 144 has an
tions 78 in the ?lm 14 and cause the lead end 67 to
into any one of threepositions. The control member or
handle 25 is movable from the “off” position to a central 20 move underneath the intermediate concave downward
or “motor” position without engaging the end section 147 ' circular section 63 of the upper ?lm loop former 61.
This surface together with the tongue 66 directs the lead
of the operating arm 144 which forms a part of the latch
end 67 of the ?lm 14 underneath the guide roller 58.
lever 138. However, when the control member or handle
This guiding action is assisted by the ?ange 68 on the
25 is moved to the uppermost or “lamp” position, as
?lm guide bracket 49 and the lead end 67 is
shown in FIGURE 3, it engages the end section 147 and 25 upper
guided along the arcuate surface 69 and upwardly over
rocks the latch lever 138 in a clockwise direction against
the convexly curved upstanding section 55 of the upper
the biasing action of the tension spring 142 to move the
?lm guide sprocket 49. The lead end 67 of the ?lm 14
latch hook .137 out of latching engagement with the de
follows the concave downward loop forming surface 70
tent 136. Thereupon the tension spring 121 acts to rock
on the under side of the upper ?lm loop former 61 to
the upper operating lever 118 in a clockwise direction 30 form the upper ?lm loop 71 and then is directed thereby
and therewith the lower operating lever 126 in a counter
downwardly to the space between the shoulder 83 on
clockwise direction. Corresponding movements of the
the guide bar 82 and the shoulder 56 on the upper ?lm
upper and lower ?lm loop formers 61 and 106 are effect
guide bracket 49 as shown in FIGURE 20. The feeding
ed to swing them to the positions shown in FIGURE 3
continues and the lead end 67 of the ?lm 14 is fed down
35
out of loop forming position and out of engagement with
ing them free for movement as the ?lm 14 is fed for
projection purposes past the projection aperture 81 by
78 are engaged by the shuttle tooth 80 in conventional
manner to advance the ?lm 14 frame by frame past the
the shuttle tooth 80 in conventional manner.
projection aperture 81. The lead end 67 continues down
In order to facilitate feeding of the lead end 67 of the 40 wardly past the lower extension 84 of the side tension
?lm 14 for self threading purposes it is desirable that it
have an end portion which isv at right angles to the edges
arm 85 and past the shoulder 97 of the lower ?lm guide
bracket 98 onto the concave upward ?lm loop forming
of the ?lm 14. For this purpose a ?lm cutter, shown
surface 197 of the lower ?lm loop former 1116 to form
generally at 150, is provided on the base 11 as shown
the lower ?lm loop 110. The lead end 67 then is guided
in FIGURES l, 2 and 3 of the drawings. The details 45 upwardly underneath the intermediate concave down
of construction of the ?lm cutter 150 are shown more
ward circular section 102 on the lower ?lm guide bracket
clearly in FIGURE 22 of the drawings.
98 and is picked up by the teeth of the lower ?lm
The ?lm cutter 151), shown in FIGURE 22, includes
sprocket 36 and is moved thereabove and outwardly
a base plate 151 that is secured by rivets 152 to the
over the exit guide roller 103. This completes the self
base 11. A pin 153 extends upwardly from the plate 151 50 threading operation.
for receiving one of the perforations 78 in the ?lm 14
However, the control member or handle 25 remains
as shown. The ?lm is placed between upstanding guides
in the “motor” position until a sufficient length of the
154 which orient it properly on the plate 151 so that an
?lm has been threaded past the exit guide roller 103 to
end portion 155 can be cut off at right angles to the ?lm
permit its being placed over the guide pulleys 16 and 17
14 by an edge 156 of a blade 157 which is ?exibly con 55 and to have the lead end 67 attached to the take up
nected at 158 to the plate 151 and is provided with a
reel 18 so that the ?lm 14 can be wound thereon.
handle. 159 which can be depressed to cut off the end por
Finally the control member or handle 25 is moved up
tion 155. It will be understood that the end portion 155 of
wardly to the “lamp” position for energizing the pro
the ?lm 14 is cut oif only once and that, thereafter, the
jection lamp while continuing operation of the motor.
lead end 67 of the ?lm 14 will be satisfactory for self 60 This ?nal upward movement of the control member or
threading.
In describing the operation of the self threading mech
handle 25 moves the end section 147 of the latch lever
138 upwardly and moves the latch hook 137 out of latch
anism it will be assumed that the reel 13 having the
ing engagement with, the detent 136. The tension
?lm 14 wound thereon is mounted on the shaft 15 and
spring 121 then biases the upper and lower ?lm loop
that the take up reel 18 is mounted on its shaft 19. 65 formers 61 and 106 out of loop forming positions to
free the upper and lower loops 71 and 110.
Also, it will be assumed that the conductors 22 are con
nected to a suitable current source for energization of
Should an attempt be made to thread the ?lm 14 with
the upper and lower ?lm loop formers 61 and 106 in the
, the drive motor and of the projection lamp. Also, it
non-loop forming position, the lead end 67, as shown
will be assumed that the control member or handle 25
is in the “011” position and that the upper and lower ?lm 70 ‘in FIGURE 6, will engage the guide roller 58 and pre
vent further feeding until the loop formers are moved
loop formers 61 and 166 are in the retracted positions
to the loop forming positions.
shown in FIGURE 3 of the drawings. Next the oper
During the operation of the'projector, should the oper
ator engages the knurled surface 72 on the upper ?lm
ation be such as to lose one or the other of the loops
loop former 61 and moves it downwardly. Through
the interconnection provided by the upper and lower 75 71 or 110, the operator can reform the loops merely
3,029,686
by depressing the upper ?lm loop former 61 momen
tarily; As soon as the loops are reformed, with the pro
jector operating, the removal of pressure from the upper
?lm loop former 61 permits them to be retracted in the
manner previously described.
Since certain changes can be made in the foregoing
construction and different embodiments of the invention
can be made without departing from the spirit and
scope thereof, it is intended that all matter shown in
the accompanying drawings and described here'mbefore 10
shall be considered as illustrative and not in a limiting
sense.
What is claimed as new is:
10
per ?lm sprocket and‘ rotatable about an axis parallel to
the axis of rotation thereof; an upper loop former pivot
ed atone end on said support about the axis of rotation
of said entrance guide roller and having an intermediate
concave downward circular section concentric in loop
forming position with said upper ?lm sprocket and over
lying and spaced from the upper portion thereof for guid
ing the lead end of said ?lm around said upper ?lm
sprocket and underneath said centrally grooved guide
roller with the assistance of a tongue forming a continua
tion of the surface of said concave downward circular sec
tion and extending into the groove of said grooved guide
roller, a concave downward loop forming section at the
1.v In a motion picture projector, in combination, a
other end overlying and spaced from said upstanding
support, a vertical aperture plate on said support having 15 section on said upper ?lm guide bracket for guiding said
a projection aperture, upper and lower ?lm sprockets ro
lead end of said ?lm to form an upper loop and to move
tatably mounted one above the other about horizontal
downwardly along said aperture plate past said projec
axes on said support in front of and parallel to said
tion
aperture therein, and an upper operating arm; said
aperture plate, an upper ?lm guide bracket on said sup
port having an intermediate concave upward circular 20 upper loop former in raised position having said concave
downward circular section directed toward said grooved
section concentric with said upper ?lm sprocket and un4
roller whereby ‘further threading of said lead end of said
derlying and spaced from the lower portion thereof, a
?lm is prevented; a lower ?lm guide bracket on said sup
convexly curved upstanding section at one end adjacent
port having an intermediate concave downward circular
Said aperture plate, and a horizontal upwardly facing
shelf at the other end; an upper loop former pivoted 25 section concentric with said lower ?lm sprocket and over
lying and spaced from the upper portion thereof, a con—
at one end on said support and having an intermediate
vexly curved depending section at one end adjacent said
concave downward circular section concentric in loop
aperture plate and an exit guide roller atthe other end
forming position with said upper ?lm sprocket and over
rotatable about an axis parallel to the axis of rotation of
lying and spaced from the upper portion thereof for
guiding the lead end of said ?lm around said upper ?lm 30 said lower ?lm sprocket for guiding said ?lm therefrom; ,
a lower loop former pivoted at one end on said support
sprocket, a concave downward loop forming section at
about the axis of rotation of said exits guide roller and
the other end overlying and spaced from said upstand
having a concave upward loop forming section at the
ing section on said upper ?lm guide bracket for guiding
other end underlying and spaced from said depending
said lead end of said ?lm to form an upper loop and to
section on said lower ?lm guide ‘bracket for guiding said
move downwardly along said aperture plate past said
lead end of said ?lm to form a lower loop as said lead
projection aperture therein, and an upper operating arm;
end moves downwardly past the lower end of said aper
a lower ?lm guide bracket on said support having an
ture plate and for directing said lead end to 'saidlower
intermediate concave downward circular section concen~
?lm sprocket, an intermediate concave upward circular
trio with said lower ?lm sprocket and overlying and
. spaced from the upper portion thereof, a convexly curved 40 section concentric in loop forming position with said low
er ?lm sprocket and overlying and spaced from the lower
depending section at one end adjacent said aperture plate,
portion thereof, and a lower operating arm;_ and operat
and an exit guide roller at the other end rotatable about
ing means connected to said upper and lower operating
an axis parallel to the axis of rotation of said lower
arms for rotating said upper and lower loop formers into
?lm sprocket for guiding said ?lm therefrom; a lower
loop former pivoted at one end on said support about 45 and out of loop forming positions.
3. In a motion picture projector, in combination, a
the axis of rotation of said exit guide roller and having
Support, a vertical aperture plate on said support having
a concave upward loop forming section at the other
end underlying and spaced from said depending section
a projection aperture, upper and lower ?lm sprockets
on said lower ?lm guide bracket for guiding said lead
rotatably mounted one above the other about horizontal
end of said ?lm to form a lower loop as said lead end
axes on said support in front of and parallel to said aper
moves downwardly past the lower end of said aperture 50 ture plate, an upper ?lm guide bracket on said support hav
plate and for directing said lead end to said lower ?lm
ing an intermediate concave upward circular section con
sprocket, an intermediate concave upward circular sec
centric with said upper ?lm sprocket and underlying and
spaced from the lower portion thereof, a convexly curved
upstanding section at one end adjacent said aperture
portion thereof, and a lower operating arm; and oper 55 plate, and a horizontal upwardly facing shelf at the other
tion concentric in loop forming position with said lower
?lm ‘sprocket and overlying and spaced from the lower
ating means connected to said upper and lower operating
arms for rotating said upper and lower loop formers
into and out of loop forming positions.
end; an upper loop former pivoted at one end on said
support and having an intermediate concave downward
circular ‘section concentric in loop forming position with
2. In a motion picture projector, in combination, a sup_
said upper ?lm sprocket and overlying and spaced from
port, a vertical aperture plate on said support having a 60 the upper portion thereof for guiding the lead end of said
projection aperture, upper and lower ?lm sprockets rotat
?lm around said upper ?lm sprocket, a concave down
a-bly mounted one above the other about horizontal. axes
ward loop forming section at the other end overlying and
onrsaid support in front of and parallel to said aperture
spaced from said upstanding section on said upper ?lm
plate, an upper ?lm guide bracket on said support having
guide bracket for guiding said lead end of said ?lm to
an intermediate concave upward circular section concen 65 form an upper loop and to move downwardly along said
tric with said upper ?lm sprocket and underlying and
aperture plate past said projection aperture therein, and
spaced from the lower portion thereof, a convexly curved
an upper operating arm; a lower ?lm guide bracket on
upstanding section at one end adjacent said aperture
said support having an intermediate concave downward
plate, a horizontal upwardly facing shelf at the other
70 circular section concentric with said lower ?lm sprocket
end, an entrance guide roller above and at the end of
and overlying and spaced from the upper portion thereof,
said shelf adjacent said upper ?lm sprocket and rotatable
a convexly curved depending section at one end adja
about an axis parallel to the axis of rotation thereof for ‘
cent said aperture plate, and an exit guide roller at the
guiding said ?lm thereto, and a centrally grooved guide
other end rotatable about an axis parallel to the axis of
_ roller between said convexly curved section and said up 75 rotation of said lower ?lm sprocket for guiding said ?lm
3,029,688
11
12
therefrom; a lower loop former pivoted at one end on
detent carried by said lower operating lever, and a ten
sion spring interconnecting said upper operating lever and
said support and biasing said upper and lower loop formers
out of their loop'forming positions; a latch lever pivoted
said’ support about the axis of rotation of said exit guide ‘
roller and having a concave upward loop forming sec
tion at the other end underlying and spaced from said
depending section on said lower ?lm guide bracket for
guiding said lead end of said ?lm to form a lower loop
as said lead end moves downwardly past the lower end of
said aperture plate and for directing said lead end to said
lower ?lm sprocket, an intermediate concave upward cir
on said support and having a latch hook for engaging said
detent to hold said upper and lower loop formers in their
loop forming positions, a tension spring interconnecting
said latch lever and said support and ‘biasing said latch
hook into latching engagement with said detent, and a
cular section concentric in loop forming position with 10 control member movably mounted on said support for
engaging said latch lever to move said latch hook out of
said lower ?lm sprocket and overlying and spaced from
latching engagement with said detent whereupon the ?rst
the lower portion thereof, and a lower operating arm;
mentioned tension spring rotates said upper and lower
operating means for rotating said upper and lower loop
formers into and out of loop forming positions including
loop formers away from their loop forming positions.
5. In a motion picture projector, in combination, a sup
an upper operating lever rotatably mounted intermediate 15
port, a longitudinally grooved vertical aperture plate on
its ends on said support and connected to said upper
said support having a projection aperture at the bottom
operating arm, a lower operating lever rotatably mounted
of the groove for receiving. ?lm perforated along one edge
intermediate its ends on said support and connected to
with the central image carrying portion of the ?lm overly
said upper operating lever and to said lower operating
arm, and a tension spring connected to one of said operat 20 ing the groove and spaced from the bottom thereof,
ing levers and biasing said upper and lower loop formers
shoulder providing means on said aperture plate along
out of their loop forming positions; and latch means
cooperating with said operating means to hold said upper
said aperture plate having upper and lower slots along said
one side of said groove for guiding one edge of said ?lm,
other side of said groove, upper and lower ?lm sprockets
4. In a motion picture projector, in combination, a sup 25 rotatably mounted one above the other about horizontal
axes on said support in .front of and parallel to said aper
port, a vertical aperture plate on said support having a
ture plate, means on said support driving said upper and
projection aperture, upper and lower ?lm sprockets rotat
lower ?lm sprockets; an upper ?lm guide bracket on said
ably mounted one above the other about horizontal axes
support having an intermediate concave upward circular
on said support in front of and parallel to said aperture
section concentric with said upper ?lm sprocket and
plate, an upper ?lm guide bracket on said support having
and lower loop formers in loop forming positions.
an intermediate concave upward circular section concene
underlying and spaced from the lower portion thereof, a
tric with said upper ?lm sprocket and underlying and
shoulder at one end inter?tting ‘with said upper slot in
aperture plate past said projection aperture therein, and
circular section concentric in loop forming position with
said upper ?lm sprocket and overlying and spaced from
the upper portion thereof for guiding the lead end of
said aperture plate, a convexly curved upstanding section
spaced from the lower portion thereof, a convexly curved
adjacent the upper end of said shoulder, a horizontal
upstanding section at one end adjacent said aperture
plate, and a horizontal upwardly facing shelf at the other 35 upwardly facing shelf at the‘ other, end in a plane above
the axis of rotation of said upper ?lm sprocket, an en
end; an upper loop former pivoted at one end on said
trance guide roller above and at the end of said shelf
support and having an intermediate concave downward
adjacent said upper ?lm sprocket and rotatable about an
circular section concentric in loop forming position with
axis parallel to the axis‘ of rotation thereof ,for guiding
said upper ?lm sprocket and overlying and spaced from
the upper portion thereof for guiding the lead end of said 40 said ?lm thereto, and a second guide roller between said
convexly curved section and said upper ?lm sprocket and
?lm around said upper ?lm sprocket, a concave down
rotatable about an axis parallel to the axis of rotation
ward loop forming section at the other end overlying and
thereof; an upper loop former pivoted at one end on said
spaced from said upstanding section on said upper ?lm
support about the axis of rotation of said entrance guide
guide bracket for guiding said lead end of said ?lm to
form an upper loop and to move downwardly along said 45 roller , and having an intermediate concave downward
an upper operating arm; a lower ?lm guide bracket on
said support having an intermediate concave downward
said ?lm around said upper ?lm sprocket and underneath
circular section concentric with said‘ lower ?lm sprocket
and overlying and spaced from the upper portion thereof, 50 said second guide roller, a concave downward loop form
ing section at the other end overlying and spaced from
a convexly curved depending section at one end adjacent
‘said aperture plate, and an exit guide roller at the other
end rotatable about an axis parallel to the axis of rotation
of said lower ?lm sprocket for guiding said ?lm there
said upstanding section on said upper ?lm guide bracket
and having a concave upward loop ‘forming section at the
upper operating arm extending parallel to the axis of
rotation of said upper ?lm sprocket; a lower ?lm guide
for guiding said lead end of said ?lm to form an upper
loop and to enter the space between ‘said shoulder pro
from; a lower loop former pivoted at one end on said 55 viding means on said aperture plate and said shoulder at
said one end of said upper ?lm guide bracket, and an
support about the axis of rotation of said exit guide roller
other end underlying and spaced from said depending
bracket on said support having an intermediate concave
section on said lower ?lm guide bracket for guiding said
lead end of said ?lm to vform a lower loop as said lead 60 downward circular section concentric with said lower ?lm
sprocket and overlying and spaced from the upper por
end moves downwardly past the lower end of said aper
tion thereof, a shoulder atone end inter?tting with said
ture plate and for directing said lead end to said lower
lower slot in said aperture plate, a convexly curved de
?lm sprocket, an intermediate concave upward circular
pending section adjacent the lower end of said shoulder,
section concentric in loop forming position with said
lower ?lm sprocket and overlying and spaced from the 65 and an exit guide roller at the other end rotatable about
an axis parallel to the axis of rotation of said lower ?lm
lower portion thereof, and a lower operating arm; operat
sprocket for guiding said ?lm therefrom; a lower loop
ing means for rotating said upper and lower loop formers
former pivoted at one end on said support about the axis
into and out of loop forming positions including an upper
of rotation of said exit guide roller and having a concave
operating lever rotatably mounted intermediate its ends
on said support about said axis of rotation of- said upper 70 upward loop forming section at the other end underlying
?lm sprocket and connected to said upper operating arm
and, a lower operating lever rotatably mounted inter
mediate its ends on said support about said axis of rota
tion of said lower ?lm sprocket and connected to said
upper operating lever and to said lower operating arm, ‘a
and spaced from said depending section on said lower
?lm guide bracket ‘for guiding said lead end of said ?lm to
form‘ a lower loop as said lead end emerges from the
space between said shoulder providing means on said
aperture plate and said shoulder at said one end of said
3,029,686
lower '?lm guide bracket and for directing said lead end
to said lower ?lm sprocket, an intermediate concave up
wardlcircular section concentric in loop forming position
' with said lower ?lm sprocket and overlying and spaced
rom the lower portion thereof, and a lower operating
arm extending parallel _-to said axis of rotation of said
r
‘1d
of said'lower ?lm sprocket ‘for guiding said ?lm therefrom;
a lower loop former pivoted at one end on said support
about the axis of rotation of said exit guide roller and
having a concave upward loop forming section at the
other end underlying and spaced from said depending
section on said lower ?lm guide bracket for guiding said
lower ?lm sprocket; operating means for rotating said
lead end of said ?lm to form a lower loop as said lead
upper and lower loop formers into and out of loop‘ form
end emerges from the space between said shoulder pro
ing positions including an upper operating lever rotatably
viding means on said aperture plate and said shoulder
mounted intermediate its ends on said support about said 10 at said one end of said lower ?lm guide bracket and for
axis of rotation of said upper ?lm sprocket and having a
directing said lead end to said lower ?lm sprocket, an
slotted upper end slidably engaging said upper operating
intermediate concave upward circular section concentric
arm and a slotted lower end, a lower operating lever
in loop‘forming position with said lower ?lm sprocket
rotatably mounted intermediate its ends on said support
and overlying and spaced from the lower portion thereof,
about said axis of rotation of said lower ?lm sprocket 15 and a lower operating arm extending parallel to said axis
and having an arm at its upper end slidably engaging the
of rotation of said lower ?lm sprocket; operating means
slot in said lower end of said upper operating lever and a
for rotating said upper and lower loop formers into and
slotted lower end slidably engaging said lower operating , out of loop forming positions including an upper operat
arm, and a tension spring interconnecting said upper end
ing lever rotatably mounted intermediate its ends on said
of said upper operating lever and said support and biasing 20 support about said axis of rotation of said upper ?lm
said upper and lower loop formers out of their loop
sprocketand having a slotted upper end slidably engaging
forming positions; and latch means cooperating with said
said upper operating arm and a slotted lower end, a
lower operating lever to hold said upper and lower loop
lower operating lever rotatably mounted intermediate its
formers invloop forming positions.
ends on said support about said axis of rotation of said
6. In a motion picture projector, in combination, a sup 25 lower ?lm sprocket and having an arm at its upper end
port, a longitudinally grooved vertical aperture plate on
slidably engaging the slot in said lower end of said upper
said support having a projection aperture at the bottom
operating lever and a slotted lower end slidably engaging
of the groove vfor receiving ?lm perforated along one
edge with the central image carrying portion of the ?lm"
overlying the groove and spaced from the bottom thereof, '
shoulder providing means on said aperture plate along
one side of said groove for guiding one edge of said ?lm,
said aperture plate having upper and lower ?lm sprockets
rotatably mounted one above the other about horizontal
axes on said support in front of and parallel to said aper
ture plate, means on said support driving said upper and
lower ?lm sprockets; an upper ?lm guide bracket on said
support having an intermediate concave upward circular
section concentric with said upper ?lm sprocket and un
derlying and spaced from the lower portion thereof, a 40
shoulder at one end inter?tting with said upper slot in
said aperture plate, a convexly curved upstanding section
. said lower operating arm and a laterally extending detent,
and a tension spring interconnecting said upper end of
said upper operating lever and said support and biasing
said upper and lower loop formers out of their loop form
ing positions; a latch lever pivoted intermediate its ends on
said support and having a latch hook at its upper end
ror engaging said detent to hold said upper and lower
loop formers in their loop forming positions and an op~
crating arm at its lower end, and a tension spring inter
connecting said upper end of said latch lever and said
support and biasing said latch hook into latching engage
ment with said detent.
7. In a motion picture ‘projector, a mechanism plate,
a generally vertical aperture plate mounted on the mecha—
nism plate, a' sprocket on the mechanism plate, an inner
bracket member mounted on the mechanism plate and hav
adjacent the upper end of said shoulder, a horizontal up
wardly facing shelf at the other end in a plane above the
ing a convex loop forming portion adjacent the lower end
axis of rotation of said upper ?lm sprocket, an entrance
45 of the aperture plate and a sprocket guard portion adapted
guide roller above and at the end of said shelf adjacent
to guide ?lm to the sprocket and hold the ?lm in mesh with
said upper ?lm sprocket and rotatable about an axis par
the sprocket, and a concave loop former pivotally mounted
alel to the axis of rotation thereof for guiding said ?lm
on the mechanism plate and movable between an opera
thereto, and a second guide roller between said convexly
tive position in which the loop former de?nes a loop
curved section and said upper ?lm sprocket and rotatable
50 path with the loop forming portion of the bracket member
about an axis parallel to the axis of rotation thereof; an
and also guides with the bracket member the forward
upper loop former pivoted at one end on said support
end of ?lm into the sprocket and sprocket guard portion
about the axis of rotation of said entrance guide roller
of the bracket member and a retracted position in which
and having an intermediate concave downward circular
the loop former is completely out of the path of the ?lm.
section concentric in loop forming position with said up 55
8. In a motion picture projector, a loop forming means
per ?lm sprocket and overlying and spaced from the up
movable
between a loop forming position and a retracted
per portion thereof for guiding the lead end of said ?lm
position, an upper sprocket adapted to mesh with and
around said upper ?lm sprocket and underneath said sec
push the leading end of a perforated ?lm through the
ond guide roller, a concave downward loop forming sec
loop forming means when the ?lm is held in mesh there
tion at the other end overlying and spaced from said up
standing section on said upper ?lm guide bracket for 60 with, ?rst sprocket guard means adaptedrto guide the
leading end of the ?lm toward the sprocket, second
guiding said lead end of said ?lm to form an upper loop
sprocket guard means positioned so as to block the ad
and to enter the space between said shoulder provid
vance of the leading end of the ?lm as the leading, end
ing means on said aperture plate and said shoulder
of the ?lm comes thereto from the sprocket and the ?rst
at said one end of said upper ?lm guide bracket,
and and upper operating arm extending parallel to 65 sprocket guard means and to coact with the ?rst sprocket
guard means to hold the ?lm in mesh with the sprocket
the axis of rotation of said upper ?lm sprocket;
a lower ?lm guide bracket on said support having an in
after the leading end of the ?lm has been moved to one
termediate concave downward circular section concen
trio with said lower ?lm sprocket and overlying and
spaced ‘from the upper portion thereof, a shoulder at one
end inter?tting with said lower slot in said aperture plate,
a convexly curved depending section adjacent the lower
side of the second sprocket guard means, and threading
means positioned by the loop forming means when the
loop forming means is in its operative position to guide
the leading end of the ?lm to one side of the second
sprocket guard means, the threading means also being re
end of said shoulder, and an exit guide roller at the other
tracted by the loop forming means when‘ the loop form
end rotatable about an axis parallel to the axis of rotation 75 ing means is moved to its retracted position to a position
3,029,686
16
15
not guiding the ?lm to one side of the ‘second sprocket
guard means.
,
9. In a motion picture projector, a sprocket, means in
cluding a ?rst guide roller for guiding the leading end of
a perforated ?lm into peripheral engagement with the
sprocket, a second roller spaced beyond the ?rst roller in
a position adapted to coact with the ?rst roller to hold
the ?lm in mesh With the sprocket after the leading end
of the ?lm has passed to one side of the second roller,
the second roller being so positioned relative to the 10
sprocket and the ?rst roller that the leading end of the
?lm normally engages the second roller on the side there
of, opposite to said one side thereof, and a loop former
movable between a retracted position and an operative
position and having a combined blocking and pushing 15
portion which coacts with the second roller to initially
block the leading end of the ?lm when the ?lm is being
threaded around the sprocket and the loop ‘former is in
its retracted position, the blocking and pushing portion
serving when the loop ‘former is moved to its operative 20
position to guide the leading] end of the ?lm to said one
side of the second roller so that the ?lm travels around
said one side.
I
7
References Cited in the ?le of this patent
UNITED STATES PATENTS .
1,846,569
Owens _ _______ __‘ ____ .._ Feb; 23,
1,913,853
2,127,143
2,142,493
Owens ______________ __ June 13, 1933
Ross ________________ __ Aug. 16, 1938
Carpenter ___________ __ Jan. 3, 1939
1932
2,172,235
Aldinger _____________ __ Sept. 5, 1939
2,396,243
Boisselier ___________ __ Mar. 12, 1946
2,420,587
2,472,143
Dietrich ______ .._. _____ __ May 13, 1947
Briskin ._ _____________ _.. June 7, 1949
2,712,770
2,832,258
Bolsey et a1. _________ __ July 12, 1955
'Chevallaz ___________ .._ Apr. 29, 1958
'
512,453
FOREIGN PATENTS
‘
Great Britain _________ __ Sept. 15, 1939
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