US1706296A

US1706296A - Cinematographic apparatus

Info

Publication number: US1706296A
Application number: US688264A
Authority: US
Inventors: James George Samuel
Original assignee: HENRY HARRIS LLOYD
Current assignee: HENRY HARRIS LLOYD
Priority date: 1924-01-24
Filing date: 1924-01-24
Publication date: 1929-03-19
Anticipated expiration: 1946-03-19

Description

March 19, 1929. s JAMES 1,706,296

C INEMATOGRAPHI C APPARATUS Filed Jan. 24, 1924 2 Sheets-$heet 1 I12. I I I I I March 19, 1929. G. 5. JAMES 1,706,296

CINEMATOGRAPHI C APPARATUS Filed an- 1924 2 Sheets-Sheet 2 /N VEN TO R Patented Mar. 119, 1929.

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nuns, or wEs'rqLIrr'eoN-sm, ENGLAND, AssIeNoa or ONE-nan T HENRY HARRIS LLOYD, or LONDON, ENGLAND.

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fipplication filed January 24, 12:24. Serial No] 688,264.

4 This invention relates to cinematographic apparatus of the kind in which a continuous band of film is guided into and drawn ofi from a coil of film resting on its edge on a rotary table, the film being led-to the'outer laps of the coil and drawn 01f from the inner laps, or led to the inner laps and drawn ofi' from the outer laps, so that the length of film in the coil remains substantially constant whilst the apparatus is in operation.

i The said invention comprises improved" means for keeping the inner laps of the coil wound in close formation Within the laps wound outside them and forpreventing the diameter ofthe inner lap from being re duced to le'ssthan a predetermined" length.

According to this invention a series of rollers arranged in a circular row are provided mounted omaxes extending perpendicularly or'nearly perpendicularly to the film receiving. surface of the said rotary table. These axes are mounted to. slide in -,slots extendin radially or substantially radially from t e axis 'of the table and are urged towards the outer ends of the slots by springs. The slots may be formed in the rotary. table, or in a separate plate or frame a which maybe stationary or movable. The rotary table'may be formed by a single disc or it may be divided concentrically into separate/parts each of which may be rotated independentl of the other parts, so that the.

rotational e ort transmitted to any part of the film may. varyas this part-of the film table. f With this arrangement, when the tension on the inner laps of the coil of film increases above a predetermined amount so that these laps tend to move inwards away from the moved inwardly in the slots, but assdon as the tension in the film decreases the'rollers will move outwardly carrying-the inner laps of the coil with thein.- In order toprevent the formation of loose loops of film near to the coil on the table due toslacknessof'the film, suitable film tensioning devices may e provided.

The invention is hereinafter described as cabinet type which the coil supportin rotary table together with suitable opticahdevices are arranged in a cabinet'having a mil"- ror and screen mounted therein so that a illustrating a further modified arrangementv closing an optical projection apparatus 11 by which light-is projected upwardly tomoves radially to different positions on the.

- surrounding laps, then the rollers will be applied to cinematographic apparatusof the light ray projected vertically upward in the cabinet by the optical apparatus is reflected horizontally outwards from the cabinet. i

In the accompanying drawings Figure 1 shows in sectional elevation a cabinet enclosing film carrying mechanism in accordance with this invention. 1

Figure 2 is a view, on a larger scale, of the rotary table, optical projection apparatus and film tensioning device shown in Figure 1, the rotary table being shown'in central section, and i I Figure 3 is a plan thereof.

Figure 4 is a detail view of a film lubricating device hereinafter referred to. v

Figure 5 is a sectional view and Figure 6. is a plan illustrating a modified construc- 7 tion of the rotary table.

Figure 7 is a view similar to Figure 5 of the rotary table, and Figure 8 is a detail plan view of a slide block mounted in the said table.

Referring to Figural, 10 is a cabinet enwards a frame 12 hinged to the cabinet at 13 and carrying amirror at 14 and a screen either at 15 or 16 so that the projected light focussed on the screen is visible from outside the cabinet. The frame 12 can be lowered about the hinge 13 into the cabinet and coveredwith a lid 17 which can be shut when the apparatus ,is not inuse. A'film supporting rotary table 18 withits surrounding guard rim 19 and a film tensioning device comprising a jockey pulley 20 are mounted within, this cabinet. 'To prevent the interior of the cabinet from becoming excessively hot by heat radiated from the projection apparatus 11 and its motor 21, a fan 22 is arranged to draw air away from the heated parts and to'discharge it through a pipe 28 which conducts it to the outside of the cabinet.

The rotary table 18 is shown built up of

concentric parts

18, 1 8,18" (Figures 2land 3) which are individually driven'by toothed gea'ring24, 25, as shown, tir by any other suitable driving connections arranged to impart different speeds to each part of the table as required either in the same or in oppositedirections. If desired the upper surface of the table may be made of any suitable con;

tour n cross sectlon, and a unitary table may 4110' A K r I over which the borders, or those parts of the film which are usually perforated with sprocket holes, are drawn to lubricate the film and to preserve its suppleness.

The frame 31 comprising an upper and a lower ring or plate is held against rotation by an arm 32 connected to a link 33 pivotally mounted on the guard rim 19. This frame 31'has a circular movement iniparted to it by an eccentric 34 formed on .the table 18 around a central aperture '35 therein, and the said framehasfa circular row of radial slots 36 formed vtherein in which pins 37 are mounted to carry rollers 38. The pins 37 are held at the outer ends of the slots 36 by springs 39." o

The film 27 is lapped around the rollers 38 which prevent the inner laps of the coil thus formed from being pulled away from the laps next surrounding them, and so long as the tension on the inner laps of the filmdoes not exceed a certain amount the pins 2 are held in a circular row at the outer ends of the slots. When the tension on the inner j that of the adjacent rollers.

; laps exceeds a certain amount the springs 39 thus limiting the reduction of the diameter of the innermost laps. When the tension subsequently decreases, the springs return the rollers to the outerends of the slots thereby opening out the inner laps of the coil. The rollers 38 may be conical, or concave or of any suitable shape and some of therollers may be of a different shape from The pins 37 are shown set substantially at right angles to the surface of the table 18 but each or any of the rollers may be inclined at any convenient angle.

The part of the film bent out from the inner coil may ass between two rollers mounted in the ame 31 and these rollers are preferably conical or arranged at a con-' lengths are added to and taken from the coil at opposite ends respectively the angular velocities of the different laps must differ correspondin ly. Thus there is a varying amount of Sllp throughout the coil but this the jockey pulley, the pivot. of which can be movably mounted in a ideway instead of being carried on a pivoted arm. By forming the table 18 with a central aperture To prevent in j the optical apparatus 11 can be placed in line below the said table and the projected beam of light passed through this aperture 'tothe screen. This provides a very compact construction. The film 27 passing across the line of projection is guided by two pairs of

rollers

43 and 43 arranged in lineand on opposite sides of the line of pro-' jection, as will be understood from a consideration of Figs. 2 and 3.

Instead of the eccentric'34 formed around the aperture 35 in the table 18, the table may be made without this aperture as shown in Figures 5 and 6, and then the lower ring or plate ofthe frame 31 may be provided with a cross bar 44 having a' hole therein to accommodate a pin 45' holding the frame concentric with the table, or movable into any one of a series of eccentric holes 46 in the table to serve as a crank'pin for imparting circular movement to the frame 31 held against rotation by the arm 32 and link In a further modified arrangement illustrated in Figures 7 and 8, instead of mounting the rollers 38 in a frame separate from the table, the roller pins 37 are mbunted in slide blocks 47 moved outwardly in slots 48 formed in the table by springs 49. In the case of a table comprising concentric parts, the part in which the blocks 47 are slidably mounted can be held against rotation. This construction allows the table to be provided with a central aperture similar to the aperture 35 in the table shown in Figure 2.

I claim 1. Cinematograph apparatus comprising an optical projection apparatus, a 'rotary table mounted above said projection apparatus and having an aperture in alignment with the optical center of said projection apparatus means for guiding a continuous band of film 'edgewise on to and from the table, a circular row of rollers around which the film is lapped and which are supported substantially perpendicular to the; table,

yieldin i supports arranged to allow movemeans for thesaid rollers, amovableframe Y ment the rollersradially with reference carrying said supporting means, means for to the said table, and means for keeping unguiding a continuous length of film to and der tension parts of the film passing from from a coil of film formed around the said and returning to the table. rollers," and means comprlsing the table as a 2. Cinematographic apparatus comprising driving'element for transmitting a gyrato'ry an pptical projection apparatus, an apermovement to the said frame. tured rotary table mount d above said projection apparatus, with the aperture in-aligntical pro ection apparatus, an apertured inent with the optical centre of said projectablerotatalolymounted above the pro ection tion apparatus, means for guiding a conapparatus with the aperture in alignment 'tlIlllOUS band of film-edgewise onto and from with the optical centre of said projection the table, a circular row of rollers around apparatus, a" circular row of rollers mounted which the film on the table is lapped, and above the said table, a radially movable supineans for keeping under tension parts of the porting means for each roller individually, film passing from and returning to the table. a movable frame carry ng said supporting 3S Cineihatographic apparatus comprising means, "means for guiding .acontinuous an pptical projection apparatus, .an aperlength of film to and from a coil of film tured r'otarytable mounted above said proformed around the said rollers, and means jection apparatus, with the aperture in for imparting a gyratory movement to the alignment withthe optical centre of said said frame from the rotary table. projection apparatus,v.means for guiding a 8. In cinematographic apparatus, an opcontinuous' band' of film edgewise onto and tical projection apparatus, an aperturcd from the table, a circular row of rollers table rotatably mounted above the projection around which the film on the table is lapped, j apparatus] with the aperture in alignment and means for applying tension to parts of with the optical centre of ,said projection the film not lapped around the saidrollers. apparatus, a circular row of rollers mounted of film edgewise on to and from the table,

,and returning to the laps around the rollers.

4. In cinematographic apparatus, anloptiabove the said table, cal projection apparatus, an apertured porting means for each roller individually, rotary table mounted above said projection a movable frame carrying said supporting apparatus with the aperture in alignment means, means for imparting a gyratory 7. In cinematographic apparatus, an opa radially movable sup- 9 with the optical centre of said projection movement to the said frame from the rotary apparatus, saide table comprising concentric table,

a link connection to a fixed'part to parts, means for guiding a continuous band prevent'rotation of the frame, and means for a guiding a continuous length of film to and circular row of rollersaround which'the film from a coil of film formed around the said is lappedand which are supported substanrollers. j p tially perpendicular to th table, pins on 9. In cinematographic apparatus, an optiwhich the rollers are rotatably mounted, cal projection apparatus, an apertured tablc' means for. supporting the said pins so that rotatably mounted above the projection ap-c they are movable radially with reference to paratus with the aperture in alignment with the axis of the table,'and means for applythe optical centre of said projection apparaing tension to the parts of the film leaving tus, a circular row of. rollers mounted above 5 In cinematographic apparatus, an optimeans for each roller individually, a movable. cal pro ection apparatus,- an apertured rotary frame carrying said supporting means, table comprising concentric parts mounted means for imparting a gyratory movement above said pro ection apparatus with the to the said frame from the rotary table, a

aperture in alignment-with the optical centre link connection to a fixed part to prevent roof said projection apparatus, means for rotation of the. frame, means for guiding a tating each part of said table independently, 'hontinuous length of film to and from a coil a row of rollers mounted above the said of film formed around-the said rollers, and table, radially movable supporting means for means for taking up' slackne ss at parts of the said rollers, means or"guiding a cone the film not'in the said coil.

tinuous length of film to and, from a coil'of 10. In cinematographic apparatus, an opfilm around the said' rollersyand means for tical projection appara us, an- I apertured taking up slackness at parts of thg film not table rotatably mounted-above the projection in said coil. j Y apparatus with the aperture inalignment 6. In cinematographicapparatus, an "optiwith the optical centre of said projection apcal projection apparatus,'an apertured table paratus, a circular row of rollers mounted rotatably mounted. abovethe projection ap- -above the said table, guide-pulleys arranged paratus with the aperture in'alignment with to conduct a continuous length of film to" the optical centre 'of said projection apand from a coil of film formed around the paratus, a row of rollers mounted above the said rollers, radially movable supporting said table, radially inovable supporting means for individual rollers arranged to move inwardly under the tension of the film,

and a Inovably supported jockey pulley arranged to take up slackness at parts of the film not. inthe said coil.

11. In cinematographic apparatus, an optical projection apparatus, an apertured rotary table comprising independently rotatableparts mounted above the projection apparatus with the aperture in alignment with the optical centre of said projection apparatus, means for rotating each part of said table separately, a circular row of rollers mounted above the table on supports separately movable radially with respect to the axis of the table, guide pulleys arranged to conduct a continuous length of film to and from a coil of film formed around the said rollers, a pivoted counter-Weighted arm and a jockey pulley carried by said arm and pressed against the film by the counterweight.

12. In cinematographic apparatus, an optical projection apparatus, an apertured table rotatably mounted above the projection apparatus, with the aperture in alignment with the optical centre of said projection apparatus, a circular row of rollers supported above the table, means for guiding a continuous length of film to and from a coil formed around the rollers, movable support-' ing means for individual rollers arranged to move radially outwardly under the action of springs and inwardly under the tension of the film, means for maintaining under ten sion parts of the film outside the said coils, and a stationary guard rim around the edge of the said table.

13. In cinematographic apparatus, an optical projection apparatus, an apertured table rotatably mounted above the projection apparatus, with the aperture in alignment with the optical centre of said projection apparatus, a circular row of rollers mounted above the said table, a radially movable supporting means for each roller individually, a movable frame carrying said supporting means, means for imparting a gyratory .movement to the said frame from the rotary movement of the table, a stationary guard rim around the said table, a link connection between the movable frame and the stationary rim, and means for guiding a continuous length of'film to and from a coil of film formed around the said rollers.

14. In cinematographic apparatus, an optical projection apparatus, an apertured table rotatably mounted above the projection apparatus, with the aperture in alinement with the optical center of the said projection apparatus, a circular row of rollers mounted above the table around the said aperture, radially movable supporting means for the said rollers, and means for guiding a continuous length of film to and from a coil of film formed around the said rollers.

15. In cincmatograph apparatus, an optical projection apparatus, an apertured table rotatably mounted above the projection apparatus with the aperture in alignment with the optical centre of said projection apparatus, a stationary guard rim around the edge of the said table, a circular row of rollers mounted above the table around the said aperture, radially moving supporting means for the said rollers, and means for guiding a continuous length of film to and from a coil formed around the said rollers into alignment with the optical centre of the said projection apparatus. i v

16. In cinematograph apparatus, an optical projection apparatus, an apertured row of rollers mounted above the table 7 around the said aperture, radially moving supporting means for the said rollers, and means for guiding a continuous length of film to and from a coil formed around the said rollers into alignment with the optical centre of the said projection apparatus.

17. In a cinematograph, a projection apparatus, a rotary table comprising a central disc and a series of rings arranged concentrically around said disc, means for independently rotating each part of said table, a circular row of rollers arranged above and within the area of said disc portion of the table, radially yielding supports arranged to allow movement of said rollers, means for simultaneously feeding film edge- Wise on to and or from a coil of film lapped around said rollers, a stationary guard rim around the edge of said table guide rollers for the film mounted on said stationary guard rim, and means for guiding the film fed from the coil on said table into alignment