Патент USA US2137070код для вставки
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.