US2074139A - Film feeding device - Google Patents

Description

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FILM FEEDING DEVICE Filed Dec. 1934 latented Mar. 16, 1937, v a I T I UNITED STATES PArENroEFics Fm1vr-FEEnmG iiivicn l Charles S. Adler, New Brunswick, N. 1., assignor W to Henry P. Massey, Montclair, N

il ppiicationijecember riser sendifii'isasai 9 Claims. (01. 271-23) In the process of recdfiiifig gr lggrgiglcing of kineticener'gy has increased four times with an sound (translations as it will hereinaftEFbr-increase oroniydouble the R. P. M. called) to or from a linear film or strip, it is When said speed has men-in r to 3600 absolutely essential that this linearfllm or strip R. R M. or ten times the rotational normal spe so acted upon must pass the point of translation of the constant speed shaft the kinetic energy thus with an even unvarying motion. v developed by the rotating mass has increased by The conventional method used to bring this 10 squared or 100 times the kinetic energy it has about is by the use of a so-called constant speed developed in rotating at 360 R. P. M. shaft upon which is'afllxed a sprocket, carrier or It will thus be seen that by converting speed dramaswell as a large balanced weighty mass. into kinetic energy we can greatly reduce the i0 'The characteristic --function of this 'constant weight of the balanced mass and its component speed shaft is to transfer or impart the speed large assemblies, for, it is the kinetic energy constant of this large weighty balanced mass to developed that is used to maintain, carry, conthe film or strip by way of the sprocket, carrier vey or draw the linear film or strip past the point 15 or drum as it rotates and carries, conveys or of translation with an evenand unvarying motion. 13 draws the film or'strip past the point of transla- The basic characteristics of my invention is i tion. I the conversion of the kinetic energy of a small However, due to the comparative low speed of mass rotating at a high speed to a mass rotating rotation of the constant speed shaft under normal at a' lesser speed such as the constant speed operation it is essential that the weighty bal- V shaft or carrier of a linear film or strip, descripanced mass attached to this shaft must be comtive details of which are asfollows:

paratively large and at times exceeding lbs. In Figures 1 and 2, I have replaced the weighty in weightwhen extreme fidelity of translation is balanced mass by a spiral gear 3 which is directly quired. attached to a standard constant speed shaft i necessitates the use of proportionately large comor drum 2 (sprocket shown in figure for conponent members and assemblies such as heavy venience as any carrier-or drum'can be substisupports, drives, bearings, housings, etc. This tuted) which in turn draws, conveys or carries takes awayfrom the possibilities of compactness the linear film or strip 5 past the point of transand portability relative to quality translations in iation which is not shown. The pinion or worm small-stationary, portable and home units. shaft 4 with its small stabilizer or flywheel 5 In my invention, I. will show that the large directly afiixed couples itself by close gear meshbalanced weighty mass and its component heavy ing (as shown in this case) with spiral gear 3 assemblies are unnecessary and at the same time whose teeth are of precision cut and proper an increase in the speed constant can be had angleso that eachcan act upon the other with 3 5 thus resulting in extremely high fidelity trnnsthe least degree of resistance and play.

iation. The function of this assembly is as follows:

Referring to the drawings, Figure 1 isa front Constantspeed shaft i with its aflixed film elevation of my novel film feeding device. sprocket,'carrier or drum 2, is caused to rotate 40 v Figure 21s a side elevation of the device shown by any standard conventional' means such as 40 in Figure 1. belt drive through pulley I or by synchronous Figure 3 is a top plan view of the device shown chain 'drive through chain sprocket 8, it causes in Figure 1. I or effects shaft 4 with stabilizer or flywheel 5 Figure '4 is a modification of my novel fllm that is attached thereto, to rotate at a prescribed feeding device. higher speed dependent upon the ratio of the 5 I herewith offer a specific P l 1 W upon gear meshing between spiral gear 3 and worm which my invention is based as well as an example or pinion shaft 4.

relative to same. This law is as follows: The high kinetic energy as developed by stabi- The kinetic energy of a mass increases by th lizer or flywheel 5 caused to rotate at comparasquare of its velocity. tively higher speed by worm or pinion shaft 4 5 A mass rotating at 360R. P. M. develops'a upon which it is afllxed, is imparted to spiral kinetic energy of X foot pounds. The same mass gear 3 through the close meshing of its teeth with rotatingat 120 R. P. M. or twice the rotational worm or pinion shaft 4, thisacts in turn upon speed develops a kinetic energy which has inthe linearfllm or strip 6 through sprocket carcr as d y the Square iIi h r W ds, the rier or drum 2 by way of shaft I, thus carrying, 55

This comparatively large weighty mass-in turn upon which is also affixed the sprocket, carrier conveying or drawing linear film or strip 6 with an even unvarying motion past the point of translation. 4

Due to the specific law I have cited above it follows that a given mass such as a .stabilizer or flywheel 5 rotating at a considerably higher speed or as specific tests that were made with a ratio of to 1, it was found that when stabilizer or flywheel 5 rotating at 3600 R. P. M. in mesh with spiral gear 3 and shaft I rotating at the stai dagd, speed ggfio R. P. M., the resultant kinetic energy of a stabilizer or flywheel of but 12 ounces had brought about a resultant fidelity of translation that was superior to a mass weight of lbs. when said mass weight was directly attached to the constant speed shaft l in place of spiral gear 3 and worm, pinion shaft 4.

Because of the resultant smallness and compactness of the component members when converting speed to kinetic energy, it readily lends itself to a more direct method of drive as shown in Figure 3 wherein the linear film or stri 6 causes sprocket, carrier or drum 0 rotate in conformity with hich sprocket, carrier or u eing directly affixed to shaft l and p ral gear 3 causes or affects worm or pinion /ear 4 with its attached stabilizer or flywheel 5 to feed or transfer back the developed kinetic energy to linear film or strip 6, thus carrying, conveying or drawing same past the point of translation with an even unvarying motion.

The characteristic function is the same as the descriptions relative to Figures 1 and 2 wherein the kinetic energy of a relatively high rotating mass is imparted or transferred back to the linear film or strip 6 which motivates it.

In Figure 4, I also show the use of two stabilizers or flywheels 5 and 5A which is closely meshed to spiral gear 3. The effect of this is as above. However, it permits the use of a lesser weight stabilizer or flywheel 5 as well as overcomes any mechanical difierences that may be present in spiral gear 3 and pinion or wor'm shaft 4.

What I claim as new and novel and desire to protect by patent of the United States is:

-1. In a mechanism for recording or reproducing sound in which the sound record is formed on an elongated ribbon of light sensitive film and i of inconsiderable mass and having a point of translation, means for progressing the ribbon past said point of translation including a rotating toothed sprocket, said ribbon being provided with spaced recesses to engage the teeth of said sprocket and ribbon progressing speed governing means including; the combination with a shaft operating at comparatively low rotative speed for tive film and of inconsiderable mass and having a point of translation, means for progressing the ribbon past said point of translation including a rotating toothed sprocket, said ribbon being provided with spaced recesses to engage the teeth of said sprocket; ribbon progressing speed regulating means including the combination with a shaft for driving said sprocket 0i c p t e y low rotative speed, of low inertia means of high rotative speed for maintaining constant the speed of said sprocket and connecting means between I said sprocket and said inertia means, said inertia means including a weight of comparatively low mass fixed on a counter-shaft and said connecting means including a spiral gear connection between the counter-shaft and the shaft for "driving said sprocket.

3. In a mechanism for recording or reproducing sound of the type in which the sound record is formed on an elongated ribbon of light sensitive film and of inconsiderable mass and having a point of translation, means for progressing the ribbon past said point of translation including a rotating toothed sprocket, said film being provided with spaced recesses to engage the teeth of said sprocket; the combination, therewith of a shaft for driving said sprocket. low inertia means of high rotary velocity for maintaining a constant speed of said sprocket and connecting means between said sprocket and said inertia means, said inertia means including a plurality of weights, each fixed to a counter-shaft and said connecting means including spiral gear connections between said counter-shafts and said shaft for driving said sprocket.

4. In a mechanism for recording or reproducing sound of the type in which the sound record is formed on an elongated ribbon of light sensitive film and of inconsiderable'mass and having a point of translation, means for progressing the ribbon past said point of translation including a rotating toothed sprocket, said film being provided with spaced recesses to engage the teeth of said sprocket; the combination therewith of a shaft for driving said sprocket, low inertia means of high rotary velocity for maintaining a. constant speed of said sprocket and connecting means between said sprocket and said inertia means, said connecting means including close meshed spiral gearing having precision cut teeth.

5. In a mechanism for recording or reproducing sound of the type in which the sound record is formed on an elongated ribbon of light sensitive film and of inconsiderable mass and having a point of translation, means for progressing the ribbon past said point of translation including a rotating toothed sprocket, said film being provided with spaced recesses to engage the teeth of said sprocket; the combination therewith of a shaft for driving said sprocket, low inertia means of high rotary velocity for maintaining a constant speed of said sprocket and connecting means comprising screw gears between said sprocket and said inertia means, said mecha;- nism including means for rotating said inertia means at a substantially higher velocity than said shaft for driving said sprocket.

6. In a phonographic apparatus in which the "sound record is formed on an elongated ribbon of light sensitive film and of inconsiderable mass and having feeding perforations therein, the

., combination of means for supporting and progressing the record ribbon from one point to another point and past an intermediate point at which the record is made on the ribbon in recording or from which the record is taken from the ribbon in reproducing under the influence of a source of light including a driven shaft having a toothed sprocket thereon, the teeth of said sprocket engaging the perforations of the ribbon, said supporting and progressing means operating at comparatively low speed, a flywheel having a comparatively small mass and operating at a comparatively high rotary speed, a screw gear operatively connecting the flywheel to the driven shaft whereby the said flywheel and driven shaft are maintained in positive and continuous operative engagement and means for driving the shaft under control of said flywheel at uniformly constant speed.

7. In a phonographic apparatus in which the sound record is formed on an elongated ribbon of light sensitive film and of inconsiderable mass, the combination of means for supporting and progressing the record ribbon from one point to another point and past an intermediate point at which the record is madeon the ribbon in recording or from which'the record is taken from the ribbon in reproducing under the influence of a source of light said supporting and progressing means operating at comparatively low speed, a flywheel having a comparatively small mass and operating at a comparatively high rotative speed, a screw gear operatively connecting the flywheel to the ribbon supporting and progressing means whereby the said flywheel and ribbon supporting and progressing means are maintained in positive and continuous op-' erative engagement and means for driving the shaft under control of said flywheel at uniformly constant speed, said apparatus thereby arranged to provide a comparatively small compact and portable device.

8. In aphonographic apparatus in which the sound record is formed on an elongated ribbon of inconsiderable mass, ,the combination of 35 means for supporting and progressing the record ribbon from one point to another point and past an intermediate point at which the record is made on the ribbon in recording or from which the record istaken from the ribbon in reproducing, including a driven shaft, said supporting and progressing means operating at comparatively low speed, a flywheel having a compartivelysmall mass and operating at a comparatively high rotary speed, a screw gear operatively connecting the flywheel to the driven shaft whereby the said flywheel and driven shaft are maintainecLin positive and continuous operative engagement and means for driving the shaft under control of said flywheel at uniformly constant speed.

9. In a phonographic apparatus in which the sound record is formed on an elongated ribbon of inconsiderable mass, the combination of means for supporting and progressing the record ribbon from one point to another point and past an intermediate point at which the record is made on the ribbon in recording or from which the record is taken from the ribbon in reproducing, said supporting and progressing means operating at comparatively low speed, a flywheel having a comparatively small mass and operating at a comparatively high rotative speed, a screw gear operatively connecting the flywheel to the ribbon supporting and progressing means whereby the said flywheel and ribbon supporting and progressing means are maintained in positive and continuous operative engagement and means for driving the shaft under control of the

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