US1480864A - Intermittent feed mechanism for cinematographic apparatus - Google Patents

Description

Jan. 15, 1 24- ,480,864

P. A. REED INTERII'I'TENT FEED IECHANISI FOR CINBIATOGRAPHIC APPARATUS Filed Jam 10. B21 3 Sheets-Sheet 1 A TT'OH'NEY.

Jan. 15,1924 1 480,864

P. A. REED INTERIITTENT FEED MECHANISM FOR CINEIATOGRAPHIC APPARATUS Filed Jan. 10. 1921 3 Sheets-Sheet 2 A TTO/PNEK Jan. 9

P. A. REED INTERMITTENT FEED MECHANISM FOR CINEIATOGRAPHIC APPARATUS Filed Jan. 10, 1921 3 Sheets-Sheet 5 INVENTOI? PE Pcr Amman Essa Patented Jan. 15,

UNITED STATES PATENT OFFICE.

PERCY am, 01' LONDON, ENGLAND, ASSIGNOB TO CINE-CHROME INSTRU- MENTS, LIMITED, 01' LONDON, ENGLAND.

INTEBMIT'IENT FEED MECHANISM FOR CINEMATOGRLPHIG APPARATUS.

Application filed January 10, 1921. Serial No. 436,88

ar yhperiod.

e present invention may be conveniently and advantageously applied to cinematographic apparatus in which the intermittent feed mechanism is of the Maltese cross type, or of the pin and 'claw type.

According to the present invention, in intermittent feed mechanism of the kind above referred to, the drive is transmitted from a driving element by a cross coupling connecting axes which. are parallel to but out of line with each other.

Thus, for example, in a cinematograph wheel member to accelerate the action of the Maltese cross with easy or gradual start and finish. I

The present invention may be conveniently and advantageously carried into practical efl'ect by unitin 'two axeswhich are out of line but mutua ly parallel by a Oldham coupling. The medial member having cross strips or projections on opposite faces, unites with grooves in two iscs or heads which face each other and are fixed on the ends of the two axes. I

The position of the grooves and strips ma be reversed.

Iii intermittent film feed mechanism of the Maltese cross type the coupling is introduced between the even drivin gear of the cinematograph action and the altese cross, the driving pin for which is mounted on an arm of the cross of the medial member of the coupling so that this medial member becomes the finger wheel member whose pin presents and retires itself'to enter and leave tangentially the slot of the Maltese cross without impact, and owing to the revolvlng 11 land, have invented.

of the centre of the medial member on a circle described on the line of centres of the two axes as a diameter accelerates the action of the. Maltesecross with easy or gradual start and finish.

According'to which axis is the driving axis the driving pin is on the cross arm remote from that axis, but the driving pin can be on either side .of the cross arm to suit the particular arrangement of the movement.

The facing discs or flanges or heads and the medial member may be all equal size discs, and the driven disc or flange or head ma serve as the locking rim for the shaped en sof the arms of the Maltese cross, such driven discor flange or head being notched to allow the arms of the Maltese cross to pass; also to allow the driving pin on the medial disc or member to pass as it moves towards or, awa from the centre of the driven disc as t e medial disc or member revolves.

The mechanism according to the present invention is well suited for enclosure in an oil bath in the usual or appropriate manner. film-feed mechanism of. the Maltese cross 1 type, the cross coupling may form the finger The film shift period eing accelerated by a device substantially as herein described, appropriate adjustment of the shutter cover period of 'a c'inemato aph machine must follow as a matter course.

The operation of .masking ma be provided for in accordance with any nown or approved methods.

- The medial member can also be fitted with two driving pins. 180 apart so as to impart two accelerated impulses to a. Maltese cross at each revolution of the driving disc..

In the accompanying drawings there is illustrated byiway of example two forms of intermittent feed mechanism under the present invention for use in cinematograph apparatus.

In the drawings I Fig. 1 is a diagrammaticview showing the applicationof an Oldham coupling under the present invention as part of an intermittent film feed mechanism.

Fig. 2 is a part sectional side view and Fig. 3 a sectional view on the line A-B of Fig. 2, looking in the direction ofthe arrow C illustrating a constructional embodimenttype of V of Fig. 1 suited for a Maltese cross feed mechanism. j

Figs. 4, 5, 6, 7, 8, 9, 10 and 11 are detail views of the various components forming the feed mechanism of Figs. 2 and 3. v

Fig. 12 is a side view and Fig. 13 is a sectional front view illustrating a variant form of feed mechanism according to the present invention adapted for a pin or claw movement, Fig. 12 being taken on the line D, D of F1 13 looking in the direction of the arrow Referring to Figs. 1 to 11 of the accomnanying drawings the coupling is introuced between the even driving gear 1, 2, of the cinematograph action and the Maltese cross 3 mounted on the usual sprocket spindle 4:- The coupling and the cross are enclosed in an oil bath provided by a casing or oil box 5. On the gear shaft 6 is a disc or flange 7 and facing this disc 7 is a second disc or flange 8 on a shaft 9. The axes of the shafts 6 and 9 are out of line but mutually parallel. The disc 7 has a groove 10 and the disc 8 a groove 11.

A medial member 12 has diametrical cross strips or projections or tongues 13 and 14 on opposite faces, respectively and at right angles to each other, the tongue 13 engaging with the groove 10 of the disc 7 and the tongue 14; engaging with the groove 11 of the disc 8,,

A driving pin 15 is mounted on an arr i of the cross of the medial member 12 of the coupling so that this medial member becomes the finger wheel member whose pin 15 presents and retires itself to enter and leave tangentially the slots 16 of the Maltese cross 3 wlthout impact, and owing to the revolving of the centre of the medial member 12 on a circle 17 (Fig. 1) described on the line of centres of the two axes as a diameter accelerates the action of the Maltese cross with easy or gradual start and finish.

The convex rim 18 of the second or driven disc orfiange 8 serves as a locking rim for theconcave edges or rim 19 of the Maltese cross 3, the driven disc 8 having a notch 20 to allow the arms 21 of the Maltese cross 3 to pass. The notch 20 also allows the driving pin 15 on the medial member 12 to pass as itmoves towards or away from the centre of the driven disc 8 as the medial member 12 revolves.

In Figs. 12 and 13 there is illustrated a variant form of film feed mechanism adapted for a pin and claw movement.

In this arrangement the medial member of the coupling comprises two discs 22, 23 connected by a bridge piece 24 serving as a crank pin. On the gear shaft 25 is a disc or flange 26 and facing this disc is a second disc or flange 27 on a shaft 28. The axesof the shafts 25 and 28 mutually parallel.

The disc 26 has a groove 29 and the disc 27 has a groove 30. The discs 22 and 23 are out of line but comprising the medial member have tongues 31 and 32 respectively, the tongue 31 engaging with the groove 29 and the tongue 32 engaging with the groove 30. A pair of claws 33, 34 on'levers 35 and 6 are connected by a fulcrum pin 37 under the influence of radius links 38 and 39. The levers 35 and 36 are connected to the bridge piece 24 of the medial member of the coupling by a sleeve and flange connection 40. Thus with a form of feed mechanism as above arranged the claws describe a substantially D pulling the film down in the flat part of the D and leaving it and returning for the next pull down on the curved part of the path.

What we claim is 1. In a cinematographic apparatus, intermittent feed mechanism; for accelerating the film shift period and lengthening its stationary period, said mechanism comprising a pair of shafts mounted parallel to but out of line with each other, a cross coupling having a floating member between the two shafts, means for engaging and moving the film, an operative connection between the said floating member of the cross coupling and the film engaging and moving means, and means to rotate one of said shafts, said floating member of said cross coupling trans mitting an accelerated intermittent movement to the film.

2." In a cinematographic apparatus,intermittent feed mechanism; for accelerating the film shift period and lengthening its stationary period, said mechanism comprising a pair of shafts mounted parallel to but out of line with each other, a coupling between the two shafts comprising two discs facing each other and a mediahmember united to the facing discs by tongues and grooves at right angles to each other, means for erigaging and moving the film, an operative connection between the medial member of said coupling and the film engaging and moving means, and means to rotate one of said shafts, said medial member trans mitting an accelerated intermittent movement to the film. 3. In a cinematographic apparatus, intermittent feed mechanism for accelerating the film shift period and lengthening its stationary period, said mechanism comprising a pair of shafts mounted parallel to but but of line with each other, a couplingbe:

tween the two shafts con'iprlsing two discs facin each other and 'a'medial member unite to the facing discs by tongues and grooves at right angles to each other, means for engaging and moving the film, a Maltese cross movement between the medial member of said coupling and the film engaging and moving means, said medial member forming the finger wheel member of said Maltese cross movement, and means to rotate one of said shafts, said medial member trans,

shaped path. v

, tionary mitting an accelerated intermittent movement to the film.

4. In a cinematographic apparatus, intermittent feed mechanism for accelerating the film shift period and lengthening its staperiod, said mechanism comprising a pair of shafts mounted parallel to but out of line with each other, a coupling between the two shafts comprising two discs facing each other and a medial member united to the facing dim b tongues and grooves at right angles to eac other, means for engaging and moving the film, a Maltese cross movement between the medial mom ber of said coupling and the film engaging and moving means, said medialmember forming the finger wheel member of said Maltese cross movement, and the edge of a facing disc forming the notched locking rim of said Maltese cross movement, and means to rotate one of said shafts, said medial member transmitting an accelerated intermittent movement to the film.

' 5. In a cinematographic apparatus intermittent feed mechanism for accelerating the film shift period and lengthening its stationary period, said mechanism comprising a pair of shafts mounted parallel to but out of line with each other, a coupling between the two .shafts comprising two corresponding discs having grooves at right angles to each other and a medial member having tongues fitting in said grooves, means for engaging and moving the film, an o erative connection between the medial mem r of said coupling and the film engaging and moving means, and means to ber transmitting an accelerated intermittent movement to the "film.

In testimon whereof I atlix m si lEROY ALFRE R ED.

rotate one of said shafts, said medial memature.

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