US1509092A - Intermittent-driving means in cinematographic apparatus - Google Patents

Description

fispm 23. B924. wwmz C. ANSELMI .ET AL IQQTERMITTENT DRIVING MEANS IN CINEMATOGRAPHIC APPARATUS Filed y 1921 3 Sheets-Sheet 1 355%,092 c. ANSELMI ET AL.

'INTERMITTENT DRIVING MEANS IN CINEMATOGRAPHIUAPPARATUS Filed y '7. 192] 3 Sh eets-Sheet- 2 C. ANSELMI ET AL INTERMIT'ITEN'I DRIVING MEANS IN 'CINBIAIOGRAPHIC APPARATUS Sept 23. 1924' ll 19 2) 3 Sheets-Sheet 5 Patented Sept. 23, 1,924.,

GLOS ANSELMI AND MABGELINO VITURRO, F BUENOS AIRES,

i is.

: '0 ENTINA.

Application filed May 7, 1921. Serial liio. 467,538.

To all whom it may concern:

Be it known that'we, CARLOS .ANsELMI and MAncELINo VITURRO, subjects of the- King of Italy and of the King of Spain, respect tively, residing at 3175 Federico Lacroze Street, Buenos Aires, Republic of Argentina, have invented certain new and useful Improvements in lntermittent Driving Means in Cinematographic Apparatus, of which the following is a specification.

@ur invention relates to certain improvements in apparatus for the projection of cinematographic films its main object being the provision of a new device for the intermittent driving of the film, said device eliminating the use of the usual perforations on the film for the driving of same. I

Another object of our present invention consists in the provision of a controlling device working in synchronism'with the driving mechanism, by means of which, and

- using a number of conveniently disposed perforations on the film the position of the picture to be projected through the window is accurately regulated, and by which means the small inaccuracies which might be caused by slipping of the film are exactly compensated.

Our invention contemplates also the pro.- vision in cinematographic apparatus of extensible driving and grinding rollers, which width may be regulated at will to suit varying widths of the films.

Our invention has further objects in view, which will be clearly seen from the following specification and which are specifically set forth in the appended claiming clauses. In order that our invention may-be clearly understood and easily carried into practicea preferred embodiment of the same has been illustrated in the accompanying draw-- inns, wherein,

Figure 1, is a side view showing diagrammatically an apparatus for the projection of cinematographic films constructed according to our present invention;

Figure 2, is an enlarged sectional view of the intermittent-driving device for the film and the controlling means for the same, themeans for the transmission of movement'so having been omitted.

Figure 3, is a side view of the driving means for the said devices.

Figure 4, is a plan view of the device for intermittently driving the film and of the transmission connections to the controlling device. Y p

. Figure 5, is a plan view of the said controlling, device.

Figure 6, is a detailed sectional view of one of the regulable driving rollers and finally, p

Figure 7, is a side elevation of one of the said driving rollers clearly showing the means for regulating the width of the same.

Similar characters of reference denote same or. like parts throughout the said. drawings.

With reference to the diagrammatic illustration of Figure 1, A is the usual frame of cinematographic apparatus, B being the film projected through the same. C is the improved device for the intermittent driving of the film B. D is a controlling or regu-. lating device working in the said driving device C. is the lens and window in front of which the film is driven and finally F are the driving rollers of adjustable width. 9 is a device for the original setting of the device for intermittently driving the film.

According to our present invention the intermittent driving of the film" is efl'ected by means of two parallel disposed rollers 1 and 2 each having a protruding portion '3 which is so disposed that the protruding parts of both rollers are in contact with each other during a determined period of the rotation of the said rollers. Both rollers turn in opposite directions so that they on only contact when their protruding portions 3 meet, at which moment said protrudmg portions firml hold the film between them and pull it ownwards, said pull last ng only whilst said protruding portions contact, which may be easily regulated by adjusting the surface of the contactlng pp;- tions to the" length of a picture of the sgipchronism with 7 5 longitudinal sliding on ports so that on turning,

Roller 1 is rigidly fixed to an axle 4 to,

'wheel 6 similarly provided with angular teeth meshes with toothed wheel 5 and receives movement from the same. Said wheel 6 is mounted on an axle 7' corresponding to the driving roller 2 and is capable of the said axle by means of a pin 8, as illustrated in Fig. 4. 10 is a supporting frame for roller2 having bearings 9 for its axle 7. Said bearings 9 are resiliently mounted so as to afford a resilient contact between the protruding portions 3 of both rollers 1 and 2 in orde: to compensate the irregularities in the thickness of film B.

Integral with gear wheel 6 there is an extension provided with a circular groove 12 wherein a fork 13: may engage. Said fork 13 has a screw-threaded part in which screws a screw threaded portion 14 of a stem rotatably supported in the frame 10 said stem carrying a finger stud so as to turn at will said stem in one or the other direction. Said stem is not capable of longitudinal sliding movement in its supthe fork '13 will be moved forwards or backwards, motion of wheel 6 wheel ,5 being fixed,v will determine a certain angular displacement of cylinder 2 with respect to cylinder 1 and hence, the contacting surface of the protruding parts 3 of the said cylinders will be augmented or diminished at will. In this way the pull of the intermittent driving means may be always accurately regulated according the length of the pictures of the particular films'used.

, Figure 5, shows clearly the special device I for controlling the intermittent drive of the film, The frame 16 carries beneath the projectifi window or on the top of the same if desired,

a at each side of the same so as to allow a tooth to engage in the same. frame 16 and in front of the above mentioned. plate ,17 a transverse and horizontalaxle 19 carrying two fixed wheels 18 are each provided with conveniently spaced teeth so that each consecutive teeth may penetrate into a perforation of the film at each sjde of the same whilst the movement of the device, as it may be clearly seen from the said Figure 5.

A toothed wheel 20 is fixed at a centralv part. of the axle and on the said wheel a pointed rod 21 may actuate, said rod penetrating by its pointed end into the space between two teeth of the wheel 20. Said rod is suitably supported in brackets and carries a coiled spring 22 which tends to a plate 17 provided with a groove On the said push,it normally against the wheel 20, al may be clearly seen from Figure 2. 23 is a retention stop fixed to axle 24 which in its turn is .also fixed to a lever arm 25 having at the opposite end a guide roller 26 which may run in a cam groove 28 formed in a wheel 27 rigidly fixed to the main axle 4. as may be seen from Figures 3 and 4. The said cam groove 28 is so formed that at the moment in which the protruding parts of rollers 1 and 2 contact, the push piece 23 pushes back the rod 21, whereby the wheel "18 is set free to rotate under the action of theadvancing fihn, but as soon as the forward motion of the said film is suspended, the push piece recedes and rod 21 is free to again advance under the action of spring 22 until its pointed end penetrates between two teeth of the wheel 20. 'In this manner any small inaccuracy which might occurin the driving of the film is easily compensated, as said film cannot advance beyond a certain regulable limit.

The driving rollers of thefilm having no driving teeth a great economyis effected in the manufacture and wearing of the film, as according to our present invention films with no driving perforations may be used.

Said driving rollers are mounted on an axle 29 suitably supported in the frame A of the apparatus. Each one of the said rollers is formed oftwo symmetrical halves 30 having near their edges a conical portion 31 with the bases adjacent to the said edges and also a cylindrical intermediate portion. Both halves of the roller are connected with a set of articulate levers 3 334 pivoted at 32 on the axle 29, as may be clearly seen from 'Fi re 6. One of the halves of the said ro lers is formed'with an extension having a groove 35 in which a finger 36 may penetrate. Said finger 36 is formed at one end of a lever 37 angularly fixed on an axle 38 rotatably mounted which the end of the other lever arm passes.

Said lever is capable of an angular displacement within the said segment. On moving lever 42 in one direction or the other the extension 3.5 of one of the halves of the roller will be advanced or recede with a corresponding half of the roller. In this way the width of the roller maybe easily regulated to suit variable widths of the film. In order to fix. the roller to a predetermined width, the end of lever 42 may be screw threaded and a nut 46 pressed against the edge of the segment.

i The operation of the apparatus accordopposite' movement of the other which will be clearly set forth in theappended claiming clauses. i

What we claim as new desire to protect by Letters Patent is- 1. A moving picture projection apparatus comprising a film feed mechanism and a projector aperture, means for moving the picture. bearing film intermittently past the projector aperture, said intermittent driving means comprising a pair of rollers arranged with their axes in substantial parallelism, means for driving the rollers in opposite directions and synchronously with the film feed mechanism, a protruding portion provided on each cylinder of periphery substantially equal to the length of a picture on the film, said protruding portions engaging the film between them during each revolution of the rollers and thereby advancing the film a distance equal to the length of a single picture, means for effecting a relative angular displacement of said feed rollers thereby varying the time of contact between saidprotruding portions and correspondingly varying the amount or dis.- tance the film moves at each revolution of the rollers and a resilient mounting for the axle of one of said rollers whereby a yield ing pressure is secured between the rollers during the period of advancing of the film.

2. A motion picture projection apparatus comprising a filmfeed mechanism and a PIO? jector aperture, means for moving the picture bearing film intermittently past the projection aperture, said intermittent driving means comprising a pair'of' rollers arranged with their axes in substantial parallelism, means for driving the rollers in opposite directions and in synchronism with the film feed mechanism, a protruding portion .provided on each roller of periphery substan tially equal to the length of the picture or film, saidprotruding portions engaging the means ieomprising a pair of sprocket wheels mounted on a common axle adjacent to the v path of the film, the teeth of said sprockets engaging perforations-With said film and running freely during the operation or advance of the film; a third toothed wheel rigidly mounted on the sprocket axle, an actuating lever operating in synchronism with the intermittent driving rollers, a

spring associated with said lever and a rod having a pointed end adapted to be reciprocated by the action of said lever through the medium of the spring, the pointed end of said rod engaging between the teethof the toothed wheel on the sprocket axle when fully extended, thereby regulating the amount of the advance of the film.

4. A'motion icture projecting apparatus comprising a lm feed mechanism and a projector aperture, means for moving the picture bearing film intermittently past the projector aperture, said intermittent driving means comprising a pair of rollers arranged with their axes in substantial parallelism, means whereby said rollers may be driven in opposite directions and synchron ously with the film feed m'echanism, a protruding portion provided on each cylinder of periphery substantially equal to the length of a picture on the film, said protruding portions engaging the film between them during each revolutronyof the rollers and thereby advancing the film a distance equal to the length of a single picture, and regulating means for adjusting the advance of the film to a proper extent, said regulating means comprising an actuating lever-operating in synchronism with said intermittent driving means, a spring associated with-said lever, a rod ada ted to be reciprocated by the action of sai lever through the'medium of the spring, a pair of toothed wheels mount-' ed on a common axle adjacent the path of films between" them during each revolution film of the rollers and thereby advancing the film a distance equal to the length of a single picture, separate means for rectifying the inaccuracies in the travel of the film and automatic means for throwing the rectifying means out of operation during the advance of the film and bringing them into operation as soon as said advance has ceased.

3. In a motion picture projection apparatus in accordance with claim 1, rectifying 5. A film feed mechanism comprising feed rollers, each of said rollers being formed in two parts, articulated rods connecting said parts, a set of lever arms associated with one of said partsfor efiectingrelative movement between the parts of the rollers and thereby regulatingthe width of the roller,-and ntermittent feed mechanism associated with said feed'rollers comprising a air of rollers arranged with their axes in en stantial parallelism, means whereby said rollers may and thereby advancin the film a distance be driven in 0 osite directions and synchequal to the len h o a sin 1e picture. 10

i'onously with t e film feed mechanism, and In testimony whereof we ave hereunto a protruding portion provided on each cy1- set our hands.

inder of periphery substantially equal to CARLOS ANSELMI.

the length of a picture on the film, said pro- MARCELINO VITURRO.

truding portions engaging the film between Witness:

I them during each revolution of the rollers Rooomro RAMiR z.

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