US1796140A - Cinematograph with continuous feed of the film - Google Patents

Description

March 10, 1931. v. CONTINSOUZA E AL 1,796,140

CINEMATOGRAPH WITH CONTINUOUS FEED OF THE FILM Filed May 28, 1926 2 Sheets-Sheet 1 v March'lO, 1931. v. CONTINSOUZA-ET AL' 1,796,140

CINEMATOGRAPH WITH CONTINUOUS FEED OF THE FILM Filed May 28, 1926 2 Sheets-Sheet 2 Ina anion CO/776050142; MBCM B 5 Patented Mar. 10, 1 931 UNITED STATES PATENT OFFICE VICTOR CONTINSOUZA AND MAURICE BAPTISTE COMBES, OF PARIS, FRANCE CINEHATOGRAPH WITH CONTINUOUS FEED OF THE FILM Application filed May 28, 1926, Serial No. 112,361, and in France June 17, 1925.

The invention of the slot of a continuous Figure 2 a section of Figure 1 upon a verimage feed cinematograph is to determine, tical plane 2-2. through its lower and upper edges, the junc- Figure 3, a section of the same Figure tion between the two image portions juxta- 1 upon a horizontalplane 3-3 of Fig. 2. posed on the screen. IVhen the height of the Fig. 4 is a diagram showing the assemblage 55 slot is equal to the advance or movement of of a continuous feed apparatus having a the film between one image and the next" crown of lenses.

the lower edge and upper ed e are project- Fig. 5 is a perspective view showing the ed on the screen along one and the same geoassemblage of a continuous feed apparatus metric line and the two portions of the pro having a crown of lenses. 60 jected image are properly juxtaposed. In these fi ures, 1 designates the gate or If the advance of the film is less than the runway in w ich the pro ection aperture 2' height of the aperture the two portions of is formed. The edges of this gate form the image overlap one another in the vicinity grooves in which a. plate 3 is adapted to slide.

of the unction, which betrays itself by the This plate carries a lug4 whichis engaged in 65 projection of a bright transverse band upon the forked end 5a of a lever 5 pivoted at-6 the screen. on the frame of the apparatus.

If, on the contrar the pitch of the film By'operating the lever 5 it is thus possible is greater than the eight of the aperture, to vary the height of the projection aper the projected image is barred or marked ture in order to adjust it to the pitch of the 70 transversely with a dark band. film.

In either case, the band travels vertically Cinemato raphs with continuous moveupon the screen during the working of the ment of the lm generally include adevice for apparatus and if this band is a definite width correcting the consequences of the irreguits passage may become perceptible and inter larity of the pitch of the film, other than that 75 fere with the projection. Now the pitch of to which the invention more especially rethe film being always more or less variable, lates. the said band (dark or light) will inevitably In certain cinematographs having continappear in the course of the projection of the uous movement of film, this movement is film and will exert its unfavourable influence. compensated by a series of movable lenses 7 30 According to the present invention, this each accompanying one image of the film F disadvantage is obviated by making the during the period of projectionof this image height of the projection aperture variable (Fig. 4). in order to allow of maintaining it constantly It is necessary to provide in general, means equal tothe pitch of the film. for displacing the lens support in the direc- The control of the mechanism for adjusttion of the axis of projection for the purpose ing the aperture is preferabl co-ordinated of varying the distance of these lenses with with that of the device by w ich the fixity mspect to the film F, for reestablishing the of the image is obtained in spite of the variafixed relation of the projected image although 40 tions of pitch of the film, this coordination the rate of movement of the film varies. being effected in such a way as toallow of In combining the control of the displacecorrecting simultaneously and by the opera ment of the support of the lenses 7 with the tion of a single member all the consequences control mechanism of the movable blade 3, it of the fluctuations of the pitch. becomes possible to maintain the fixed rela- 45 By way of example. there is represented tion of the projected image, altogether elimon the annexed drawing form of construcinating the movable band, obscure or briltion of a device arranged with a view to liant, which is reduced on the screen whenregulating the height of the projection aperever the rate 0 movement of the film varies ture. without corresponding compensation of the 5 Figure 1 is a front elevation. image height. v

' For example, in Figure 5, the control lever of the movable lever is actuated, in turning, by means of the knob 8, a shaft 9 which carries an eccentric 9, the strap of which is 5 connected to the control lever 5 by a rod 10.

On this same shaft 9 is mounted a drum 11 provided with a groove formed as a cam and with which engages the extremity of a lever 12 pivoted at 12 on a fixed axis. This lever forms at its other end, a fork 12" which embraces a collar 7 having a circular channel,

said collar being keyed to a shaft 7 which carries the crown of lens 7. This shaft is capable of sliding in its bearings. On the shaft 7 is mounted by means of a long spline,

a helicoidal pinion 13 in mesh with a similar pinion 13, carried by means of a shaft 14 which shaft also carries the toothed drum 14 entraining the film, which last-named shaft is provided with a hand crank 14." The objective is indicated by the reference character O.

It is apparent that thus maybe obtained the desired fixity of the projected image and the suppression of the dark or bright band barring the projected image.

It is quite evident that the invention is not limited to the shapes and the details of construction described above purely by way of example but may give rise to any modification based u n the same principle.

Thus, if de ired, the two lips of the aperture might be made movable.

What we claim is:

In a cinematogra h with continuously moving film, the com ination with an optical system for the compensation of the travel of the film, a projecting aperture near the film, means adapted for varying the dimen- 40 $10!! of the said aperture in the direction of tcavel of the film, means adapted for displacing the said optical system along the project- I mg axis and connecting means between those twobrggulating means, for the purpose de- In testimony whereof we have signed our names to this specification.

VICTOR CONTINSOUZA. MAURICE BAPTISTE COMBES. to 1

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