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Патент USA US2137070

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Nov. 15, 1938,
W, VOIGT
'
2,137,070
FILM PROJECTING APPARATUS
Filed July 16, 1936
3 Sheets-Sheet l
M090
INVENTOR
Wédheim
H15
l/oiqé'
ATT’ZIYQNEYS
Nov. 175, 1938»
w. VQIGT
2,137,070
FILM PROJECTING APPARATUS
Filed July 16,‘ less
a sheets-sheet :2
‘2Fig.
‘Wilhelm Voralgt
'INVENTOR
‘
MW?“ *
ms ATTORNEYS
Nov. 15, 1938.
‘
'
w, VOIGT
'
FILM PROJECTING APPARATUS
Filed July 16, 1936
2,137,070. ‘
3 Sheets-Sheet 3
Wail/26m ‘V0598
INVENTOR‘
‘
BYWA'W
v vH l 5
ATTORNEYS
Patented Nov. 15, 1938
‘2,131,070,,
UNITED STATES PATENT OFFICE
2,137,070
,
FILM PROJECTING APPARATUS
Wilhelm
Voigt, Wiesbaden-Biebrich, Germany,
assignor to Kalle & Co. Aktiengesellschaft,
Wiesbaden-Biebrich, Germany
Application July 16, 1936, Serial No. 90,842
In Germany July 16, 1935
4 Claims. (Cl. 88—18.4)
The present invention relates to ?lm project
ing apparatus.
In the usual ?lm projecting apparatus, grip
pers employed for the intermittent feeding of the
5 fllmare positively controlled by means of solid
mechanical devices. As a consequence of this
care must be taken when inserting the ?lm in the
projection window that the gripper is located in
such position that it engages with a perforation
10 of the ?lm when the apparatus is set in opera
tion. This requirement can, however, only be
ful?lled sufficiently reliably with great di?lculty.
If the forwardly moving gripper, however, fails
to engage the perforation of the ?lm, damage to
15 the latter is unavoidable.
Now it has been found that the ?lm can be set
forward with certainty without the danger of
damage if the gripper, which may, for example,
be made in fork shape, is ?xed to the piston of a
20 small pressure cylinder which is moved up and
down along the ?lm. The gas supply to this
cylinder is regulated by suitable control mem
bers, for example the slide valve gear known in
connection withsteam engines, in such manner
25 that the gripper engages with the perforation of
the ?lm during the time in which the cylinder
moves in the direction of movement of the ?lm.
The cylinder piston must accordingly immediately before or at the commencement and im
30 mediately after or at the termination respec
tively of the cylinder movement, be moved to
wards the ?lm and away from the ?lm respec
tively. During the time in which the cylinder is
moved in the opposite direction to the direction
35 of movement of the ?lm, the gripper releases the
said ?lm. By the employment of a gripper drive
of this kind, it is rendered possible to insert the
?lm in the projection window without particular
precautions. If, for instance, the gripper does
40 not immediately engage with a perforation of the
?lm, then, because of the action of the elastic
air buffer, the said gripper slides along 'the ?lm
without causing damage thereto until it engages
with the perforation.
.
The movement of the pressure cylinder itself
may be brought about in various ways. The said
movement may also be controlled by means of
gas pressure by arranging the cylinder on the
piston of another pressure cylinder. The gas
50 supply to the two cylinders may then take place
through the same control member, so that the
movements of the two pistons and consequently
the. horizontal and the vertical movements of the
gripper, are positively coupled. A further pos
66 sible arrangement for the movement of the pres
sure cylinder containing the gripper piston is
hereinafter described. The remaining movable
parts of the apparatus, for example, guide drums
and the like, are also preferably moved by gas
pressure. 'In this way, almost noiseless running
of the apparatus is obtained, which is very im
portant, particularly for home kinematographs—
especially in the projecting of sound ?lms. As
the driving gas it is preferable to employ com
pressed air, which can be produced by means of 10
a simple bulb of rubber, bellows or the like.
The supply of the compressed air to the appara
tus is effected by means of thin rubber tubes.
In this way a drive which is free from vibrations
is rendered possible. It is naturally possible to 16
substitute for the compressed air any other de
sired gas or even vapor for driving.
A constructional form of a ?lm projecting ap
paratus according to the invention is illustrated
by way of example in the accompanying draw 20
ings, in which:
Fig. 1 is a longitudinal section through the
projecting apparatus,
Fig. 2 is a plan thereof,
Fig. 3 shows a front view of the apparatus 25
with the casing removed, and
Fig. 4 shows a section taken on line 4—4 of
Fig. 1.
Referring to the drawings:
‘
Reference numeral I denotes a draw-off spool
carrying the ?lm which is to be projected. This
spool is slidably mounted on the axle II, which
is journalled in a bore of the arm IS. The said
arm is ?xed to the baseboard IQ of the appara
tus. The ?lm 20 runs from the draw-01f spool I
over the toothed guide drum 2, meanwhile pass
ing in front of and behind the said drum respec
tively over small guide rollers 2|. The ?lm then
runs in a loop over the rounded off upper wall of
the housing 43 and is thereupon led past the
projectinggwindow “by means of the guide plate 40
22, the edges of which are turned over and form
guide bars for the edges of the ?lm. The gripper
tooth l4 engages through a recess in the guide
plate with the ?lm perforation. The ?lm is after
the projection led back overthe toothed drum
23 on to the winding .up spool 24. The said spool
is mounted so as to be slidable on the axle H.
The aforementioned toothed drums are mounted
on an axle 53 rigidly with the worm wheel 25
and are driven by means of the'worm 2 . On
the toothed drum 23 a cord pulley 21 is a so ar
ranged which drives the winding up spool 24 con
nected with the pulley 29 through the medium
of a cord or chain 28.
The turning knob 33 65
2,137,070
2
may be divided for explanation into the following
four phases. ‘,
serves for overcoming the dead point when start
ing up the apparatus.
1. The nozzle 35 is connected by means of the
slide valve ||I over the openings 36 and 45 with
the cylinders 5 and II, respectively, so that the
The objective employed is represented dia
grammatically at IS. The reference numeral l5
denotes a lamp and 30 a re?ector.
3| is a lens
stream of air fed through the nozzle 35 acts on
arranged in the mount 32, which lens throws the
light emitted from the lamp in a bundle of rays
on to the ?lm located in the projection window.
The lamp |6 is mounted in the holder 54. The
the upper side of the piston 5 and the right side
of the piston i3. The piston |3 moves to the
left side, so that the gripper engages with the
10
10 current supply leads 55 and 55 are separated perforation of the film 20. During this time, the
from one another and from the supporting arm piston 5 moves somewhat down and the roll 5|
moves from the position I to the position II. The
5'! by means of the insulating layers 58.
The driving mechanism proper is arranged on cylinder l2 remains still in its initial position.
the how 34 ?xed to the baseboard. The driving The air in the lower part of the cylinder 5 and 15
15 member is constituted by the cylinder 5 in which the left part of the cylinder i2 escapes through
the openings 59 and 31, respectively, which are
the piston 8 moves. The gas for driving the ap
paratus is led through the nozzle 35 into the slide connected in this phase with the outlet opening
valve housing 9 in which the slide valve Ill is 39. The shutter is open during this phase.
2. The piston 6 moves further downward until
arranged. In known manner, the said valve al
20
20 lows the driving gas to impinge alternately it has reached its lowest position. Owing to
that
movement,
the
roll
5|
moves
from
the
posi
through the openings 36 and 31 respectively on
the two sides of the piston 5. The exhaust gas is tion II to the position III, and the cylinder l2
discharged again in known manner through the moves down. The piston i3 remains in the posi
openings 38 and 39 respectively.- The piston 6 tion it has assumed during phase 1, so that the
is connected by means of the piston rod 1 and film is drawn off. The shutter is closed during
,
the link 40 with the connecting rod 8 which is this phase.
3. The slide valve changes its position relative to
of frame-like form and drives the crank-shaft 3.
From the said crank shaft 3 the slide valve I0, the openings of the slide valve housing so that
mounted on the link 42, is operated in known the air is led from the nozzle 35 over the open 80
30 manner by means of the eccentric H and the ing 31 on the lower side of the piston 6. The
connecting rod 4| which is likewise constructed of room of the cylinder 5 above the piston 6 is con
frame-like form. The driving mechanism of the nected over the opening 36 with the outlet open
shaft 3 is accordingly identical with the usual
drive of steam engines, so that further detailed
35 description is unnecessary. The shaft 3 is car
ried on the one side through the bow 34 and the
wall of the housing 43 and is connected with the
worm 25. On the other side, the shutter disc 4
is ?xed on the axle.
The fork-shaped gripper H is ?xed to the
40
piston l3 by means of the piston rod 44. The
piston i3 moves in the cylinder i2 and receives
its driving gas through the conduits 45 and 59.
The gas supply to the cylinder i2 is regulated by
45 means of the same slide valve which regulates
the gas supply to the cylinder 5.
The supply
of the gas is effected through the bores or ports
45.
-
The cylinder I2 is ?xed to the plate 41, which in
50 turn is ?xed in the frame 48. At the upper end
of this frame the axle 50 which carries a roller
5| is journalled in a projection 49. The said
roller runs in a heart-like shaped curved guide
52 arranged in the shutter disc 4. During one
55 rotation of the curved guide, the gripper is moved
once up and down. The curved guide is so ad
justed that during the feeding of the ?lm the pic
ture is screened off by the vanes of the shutter.
The supply conduits for the driving gas to the
cylinder l2 are arranged by suitable location of
the bores 46 in such manner that the piston I3
has been moved forward towards the ?lm when
the cylinder 12 moves downwards.
The operation of the apparatus illustrated in
65 the drawings is as follows:
At the beginning, the piston 6 is in its highest
position in the cylinder 5. The shutter disc is so
located on the axle 3 that the roll 5| is in the
position I relative to the curved guide 52. Owing
70 to this position of the roll 5|, the cylinder I2 is
also in its highest position. The piston |3.,is
located on the right side of the cylinder |2 (see
Fig. 1), so that the gripper l4 does not engage
with the perforation of the ?lm. The operation
ing 38. Simultaneously, the openings 45 and 59
are connected with the openings 38 and 35, re
spectively. The piston I3 is pressed to the right
so that the gripper releases the perforation. Dur
ing this time, the piston 6 moves somewhat up
ward and the roll 5| moves from the position III
to the position IV. The cylinder l2 remains still
in the position it has assumed during phase 2. 40
The shutter is open during this phase.
4. The piston 5 moves further upward until it
has reached its highest position and the roll 5|
moves from the position IV to the position I.
Owing to this movement of the roll 5|, the cyl 45
inder i2 rises. At the end of this phase, during
which the shutter is closed, all parts have again
reached their initial position.
I claim:
1. Film projecting apparatus, comprising a film 50
guiding device containing a projecting window,
an objective before the said window and a lamp
behind the window, a driven axle above the said
window, a shutter disc on this axle, the vanes
of the said shutter disc being able to cover the 55
said projecting window, a heart-like shaped
groove in the said shutter disc, a roller which
slides in the ‘said groove and a rod connected
with the said roller, the groove being so adjusted
that during one rotation of the disc the rod
is moved once up and down, a cylinder fixed at
the free end of the said rod beneath the said
projecting window so that the axis of the cyl
inder is vertical to the said shutter disc, a piston
slidably arranged in the said cylinder, two open
ings in the said cylinder near the ends of the
cylinder, a rod on the said piston penetrating the
base plate of the said cylinder which is located
opposite to the said film guiding device, a fork
shaped gripper ?xed to the said piston rod, a
slide valve serving for regulating the gas supply
to the said cylinder, which valve is driven by
the said axle and so adjusted that the valve al
lows the gas to ?ow into the opening of the
cylinder near the gripper side of the said piston, 75
§5iy137,070
when the cylinder moves upward, and that the
valve allows the gas to flow into the other open
ing of the cylinder when the cylinder moves
downward.
2. A motion picture projection apparatus, com
prising a film guiding device Containing a win
dow, means for projecting a film in combination
with the said window, a pressure cylinder ar
ranged near the said guiding clevice and beneath
the said projecting window with its axis perpen
dicular to the plane of the said projecting win
dow, a piston slida‘oly' arranged in thev interior
the said cylinder, a rod on the said. piston pene
trating one of the base plates of the said cyl
inder through a bore, a gripper fixed on the free
one. of the said piston red, the cylinder being
located at such a distance iron’: the said guiding
(lGl‘lCE that the gi'ipgoer in the one end position of
the piston can engage with the perforation of a
3
guiding device that the gripper in the one end.’
position of- the piston can engage with the per
foration of a ?lm arranged in the said guiding
device, means serving for moving the cylinder
up and down parallel to the said guiding device,
and a valve connected with the said cylinder
adapted for regulating an alternating gas sup
ply to the said openings of the cylinder.
4. A ?lm projecting apparatus, comprising a
?lm guiding device containing a projectingwin 1o
dow, an objective before the said window, a. lamp
behind the window, a pressure cylinder arranged
near the said guiding device and beneath the said
projecting window with its axis perpendicular to
the plane of the said projecting window, a. piston 15
slidably arranged in the interior of the said cyl
inder, two openings in the wall of the said cyl
inder serving for leading a gas onto the sides of
the said piston, a rod on the said piston penetrat
lug one of the base plates of the said cylinder 20
through a bore, a. fork-shaped gripper ?xed on
film arranged in the said guiding device, means
serving for moving the cylinder up and down
parallel to the said guiding device, and means _ the said piston rod, the cylinder being located
‘for alternately leading a gas onto the sides of at such a distance from the said guiding de
the said piston.
vice that the grlpper in the one end pcmition of
A motion picture projecting apparatus, com
the piston can engage with the perforation of 25
mg a ?lm guiding device containing a pro
a ?lm arranged in the'said guiding device, means
jtft “log window, ‘means for projecting a ?lm in serving for moving the cylinder up and down par
combination with the said Window, a pressure cyl~ allel to the said guiding device, a slide valve con
index’ arranged near the said guiding device and nected with the openings of the said cylinder
beneath the said projecting Window with its axis adapted for regulating the gas supply to the cyl 30
perpendicular to the plane of the said projecting inder, the said valve being coupled in such a; way
.inclow, a piston sliciahly arranged in the inte
with the cylinder moving means that the valve
rior of the said cylinder, two openings in the wall allows the gas to ?ow into the opening of the
of the said cylinder serving for leading a gas cylinder near the gripper side of the said piston
1? onto the sides of the said piston, a rod on the when the cylinder moves upward, and that the 35
said piston penetrating one of the base plates of valve allows the gas to ?ow into the other open~
the said cylinder through a bore, a foils-shaped ing of the cylinder when the cylinder moves
gripper fixed on the saisl piston red, the cylinder downward.
being located at such a distance from the said
WILHELM VOIGT.
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