US1389824A - Arpangement for registering images in cinematographic projecting apparatus - Google Patents

Description

P. s; GAURIAT.

Patentedsept 6, 1921.

2 SHEETS-SHEET I.

s IQ ARRANGEMENT FOR REGISTERING IMAGES IN CINEMATOGRAPHIC PROJECTING APPARATUS.

APPLICATION FILEUAPR. 7, i920.

P. s. GAURIAT. ARRANGEMENT FOR REGISTERlNG- I'MAGES IN CINEMATOGRAPHIC PROJECTING APPARATUS.

APPLICATION FILED APR. 7| |920.

Patented Sept. 6, 1921.

. 2 SHEETS--SHEET 2' A hunter.

UNITED sTATEs PATENT oFFicE.

PIERRE SYLVAIN GAURIAT, OF PARIS, FRANCE, ASSIGNOR T0 ETABLISSEMENTS CON- TINSOUZA (SOCIETE ANONYME),

0F PARIS, FRANCE, A FRENCH CORPORATION.

REANGEMENT FOB REGISTERING IMAGES IN CINEMATOGRAPHIC PROJECTING APPARATUS.

Application led April 7,

To all whom t may concern.'

Be it known that I, PIERRE SYLvAiN GAURIAT, citizen of the French Republic, residing at Paris, Department of the Seine, in France, and having post-office address 9 and 13 Bue des Envierges, in the said city, have invented certain new and useful. Improvements in Arrangements 'for Registering Images in Cinematographic Projecting Apparatus; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as. will enable others skilled in the art to which it appertains to make and use the same.

.The present invention hasfor'its object an arrangement for registering images in cinematographic apparatus, to permit the preserving of synchronism lbetween the movements of feeding the film and of the operation of the shutter.

By fixed registration is meant the process of preserving the optical axis in an invariable position and in keeping or bringing the center of the images of the film 1n coincidence therewith.

In certain apparatus the registration is effected by causing a Maltese cross to rotate about the axis of the carrier of the drivingfinger, or in others the axis of the carrier of the driving-finger is caused to rotate about the Maltese cross, according to the rotation of the driving drum of the film.

Figures 1, 2, 3 and 4 show the different positions of the Maltese cross, of the driving finger, and the shutter of an apparatuspf the ordinary type to be found in the prior art tovwhich this kind of registration is applied.

. Fig. 5 is a sectional view of the improved arrangement illustrating this invention.

Fig. 6 is an end sectional view on line y* of Fig. 5.

igs. 7 and 8 illustrate diametrically the positions the various parts are supposed to occupy before a registration and at the commencement ofthe feeding period, andy Figs. 9 and 10 show the same mechanism in the different positions.

As hereinbefore stated, Figs. 1 to 4, inclusive, illustrate the usual arrangement heretofore employed, and Figs. 1 and 2 thereof represent diametrically the supposed feeding and shutter operating mechanisms before a registration and the commencement Specification of Letters Patent.

Patented Sept. 6, 1921. 1920. Serial No. 371,948.

lof the feeding period. F igs. 3 and 4 show the apparatus in a stopped position' after these mechanisms have undergone a registration.

In the construction as illustrated in Figs. l to 4, the pinion 1 receivesthe movement, transmits it to both the feed and the shutter in the following manner: to the feed, through the medium of the pinion 2 of the driving finger 3 of the cross 4 and the drum 5; and to the shutter 6, through the medium of the pinions 7, 8, 9 and of the correction differentialk 10.

The operation of correction of the shutter brings about during the working of the apparatus a perceptible momentary scintillation. l The driving finger is no longer placed with respect to the openings in the Maltese cross in the same position as before the registration, and this made it necessary in previous constructions to provide a supplementary mechanism for correcting the release of the shutter.

The present arrangement, which forms the subject matter of this invention, provides for the keeping of the driving-finger in an invariable position with relation to the openings in the Maltese cross during the registration. The correction is made on the finger itself and does not, owing to this fact, have any influence on the position of the shutter, and the supplementary correcting mechanism is therefore' unnecessary.

Figs. 5 and 6 show, by way of example, one construction of this improved arrangement, and Figs. 7 Nto 10 are working diagrams thereof.

Fig. 5 is a section through the axis of the mechanism. The pinion 11', corresponding to the drive 1 of Figs. 1 to 4 inclusive, receives movement froml the mechanism of the apparatus and transmits it to the registering arrangement. The shaft 12 on which this pinion is slidably keyed, carries a skew gear 13 rotating with said shaft 12. The gear 13 meshes with a pinion 14 keyed on the shaft 15 ofthe carrier of the, driving finger, and this pinion revolves about the gear 13 during the operation of registration. For this purpose the shafts 12 and 15 are carried by a cylindrical box 16, axtially .mounted on the shaft 12, as clearly shown in Fig. 5.

Thef pinion 13 is controlled in its rotation by the shaft 12, and in its movements along this shaft b a guide 17 loose on said shaft, which itsel receives its movement from a spindle 18 passing through a combination of two sets of ramps arranged as follows:

The two symmetrical helicoidal ramps 19 are made through the box 16, the pitch of said ramps being in relation to that of the movements of the pinion 13 along the shaft 12.

` The other set comprises two horizontal grooves 20 made in the frame 21 supporting thev box 16. The Maltese cross 22 in which is keyed the film-driving drum 23 is placed in the extension of the shaft 12 and on the same axis.

The registration of the images of the film driven by the drum 23 is obtained by the rotation of the box 16 by means of the lever 24, the angle described corresponding to the result desired.

The skew pinion 14 is driven around in the desired direction and revolves around the pinion 13. The pinion 13, under the combined action of the ramps 19 and `20, slides on its axis and compensates for the reaction which it would produce on its pinion 14 if it were t0 remain keyed on the shaft in its anterior position. It is evident that an exact determination of the pitch of the ramps relative to the cut of the pinions permitsof the pinion 13 being moved such an amount that its reaction on its pinion 14 may be correctly regulated.

The effect of the arrangement described is indicated in the diagrams of Figs. 7 to 10.

In the diagrammatic Figs. 7 and 8, the various parts are supported to occupy positions before a registration-and at the commencementof the feeding period.

In Figs. 9 and 10, the position of the various parts of the arrangement has been modified by a registration, the apparatus being supposed to be stopped. The drivingfinger has not moved in the opening of the Maltese cross. The period of feeding has not therefore been started relatively to its position anterior to the registration. On the other hand, the pinion 11 has not rotated and, consequently, the rest of the mechanism of the apparatus has not been affected by the registration and the shutter has not moved.

What I claim is:

In a fixed registration device for cinematographic apparatus, the combination with a rotating shutter and a film feeding drum, of a mechanism for simultaneously operating said shutter and drum, a Maltese cross and coperating pin drive connecting the drum to said operating means, a drum axially mounted on a driving shaft interposed between said operating mechanism and Maltese cross driving connection, a cylindrical housing surrounding said drum, a pinion slidably keyed to said drum supporting shaft and inclosed within said drum, a pinion mounted on a stub shaft eccentrically positioned Within said drum and in mesh with and adapted to revolve about said irst mentioned pinion, said stub shaft extending through the drum and supporting the Maltese cross, symmetrical helicoidal ramps cut through the walls of said drum, horizontal grooves formed in said cylindrical housing intersecting said ramps, a guide for said concentrically mounted pinion and a guide-'rod carried by said pinion casing having its opposite ends mounted in said horizontally disposed grooves in the housing in a position to be engaged by said ramp, whereby a partial-turning of the housing Will cause a rotation of the eccentrically mounted pinion and Maltese cross about the concentrically mounted pinion, and lock the same in its adjusted positions, for maintaining correct synchronism between the feeding of the film and the operation of the shutter.

In testimony whereof I affix my signature.

PIERRE SYLVAIN GAURIAT.

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