US1912153A - Rewinding mechanism for cinematographs - Google Patents

Description

. May 30, 1933. A. A. MONSON ET AL ,9

REWINDING MECHANISM FOR CINEMATOGRAPHS 'F'i'le'd March '24, 1930 2 Sheets-Sheet l May 30, 1933. A. A. MONSON ET AL 1,912,153

REWINDING MECHANISM FOR CINEMATOGRAPHS Fild March 24, 1930 2 Sheets-Sheet 2 an VIIIIIIIIIIJ Z\\\\\\\\-I- Patented May 30, 1933 UNlTED STATES PATENT v orrlcs AIEL A. MONSON AND ABRAHAM SHAPIRO, OI CHICAGO, ILLINOIS ASSIGNORS TO UNIVERSAL STAMPING &. MFG. CO., OF CHICAGO, ILLINOIS, A CORPORATION OF rumors Applicationfiled larch 24, 1930. Serial no. 438,497.

The main objects of this invention are to provide an improved form of cinemato graph; to provide a cinematograph having improved mechanism for rewinding the film from the take-u reel to the feed reel; and to provide a Elm rewinding mechanism which operates at high speed.

An illustrative embodiment of this invention is shown in the accompanying drawings, wherein: r

Figure l is a fragmentary side elevation of the front portionof a cinematograph to which the improved rewinding mechanism has been applied.

Fig. 2 is a similar viewbut with the side plate of the casing removed to show the gears, and with the rewinding belt and pulley removed. 7

Fig. 3 is a top plan of the parts shown in Fig. 1, but showing the feed reel in dotted outline.

Fig. 4 is a vertical section, taken on the line 44 of Fig. 5, showing the clutch of the shaft of the feed reel. i

Fig. 5 is a vertical section, taken on the 7 line 5-5 of Fig. 3.

Fig. 6 is arr-enlarged vertical section,

" taken on the line 66 of Fig. 3.

Fi of Fig. 6."

Fig. 8 is adetail in elevation showing the clutch which connects the rewinding belt to the gearing. a 1

Inasmuch as this invention relates-particularly to the rewinding mechanism, the accompanying drawings show only as much of an entire projector as will be helpful in apprehending the invention."

The improved rewinding mechanism may be used in connection with various types of cinematographs but, in the formshown, it is applied to a cinematograph of the type shown in" the co-pending application Serial No. 314,630, filedJune 29, 1929, in the name of Abraham; Sa ier.

Cinematograp s generall'y include an upright casing on which is-mounted the usual light'interceptor between the light bulb and the film guideway. The film is supported by a pair of reels and is usually fed from 7 is a section, taken on the line 7-7 the feed reel to the take-up reel by a pair of continuously driven sprockets. As the film passes through the guideway, an intermlttent motion is imparted to itby suitable means, such as a reciprocating claw, for momentarily positioning each picture directly in the path of light. In the construction herein shown, the easmg of the machine, which is only partly shown, includes a side wall 1 having a gear housing 2 formed at its front end for housmg a train of gears which drives the light interceptor, feeding claw, and film sprockets.. A removable plate 3 is secured to the gear housing by screws 4.

Formed on the forward end of the wall 1, is a pair of lugs 5, on which is hinged a pair of. arms 6. The lower arm 6-supports a not shown, which engages the cinema film A,

as is well understood.

Supported on the upper arm 6, are bushings 10, in which is journaled a shaft or spindle 11, having a head 12 for supporting a feed reel 18. During the normal operation of the machine, the feed reel 13 and spindle 11 are rotated solely by the action f the film which is unwound from the feed reel by means of a feed sprocket 14: mounted on a'shaft 15 which is journaled in the gear housing 2.

i The train of gears in the housing 2 includes gears 16 and 17 fast olrtlieshafts 9 and 15, respectively, and meshing with an intermediate gear 18, which meshes witha pinion 19. The pinion 19 has a hub'QO, which is keyed to a sleeve 21 by a pair of pins22, which project outwardly beyond the hub, its-shown in Fig. 6, 'soas to serve as part of aclutch her'einafter described." The sleeve i 21' is rotatable on a shaft23 which is "fixed on a bracket 24: in the housing 2. Axial movement of the sleeve 21 is prevent'ed b'y the bracket '24 and a collar 25 fixed onthe indicated by on a main drive shaft 28. The pinion 27 also drives a gear 29, which operates the film feeding claw, not shown. A gear 30 on the drive shaft 28 meshes with a gear 31 for 8 operatin the light interceptor, not shown."

, All the arrows which. appear on the drawings for indicating direction of movement are pointed so as to indicate the direction of movement during the rewinding operation. ,During the normal operation of the machine-for displaying the pictures, the move in directions opposite to those the arrows. The pro]ector herein shown includes reversing meansand an independent rewinding mechanism. Both the reversing means and the rewindin mecha serve to reverse the feed ree so as to ca the film to rewind onto the feed reel. Ho ever, the re- 80 yersing means alone, without the rewindmg mechanism, is employed when it is; de-

sired to merely artially rewind the film as, for instance, w on the operator desires to bring 'a icture back to the light aperture after it as passed through the film guide- 'l he rewinding mechanism is generally used only when it is desired to rewind the gleizire film from the tjake-up reel to the feed In the form sho the reversing means comprises a belt 32 which is connected to a pulley 33 on the and to a clutch on the spindle 11. s clutch includes a drum Loosely mounted on the hub 35, is a pulley 86 for the belt 32. to one face of the pulley 36 is a ratchet 37 which coacts with balls as for hihaih the pulley 36 to the spindle 11 only when t e belt 32 is reversed in thedirection of the arrows shown in Figs. 3 and 4. This reve means could be employed for rewinding the entire film but it is not fast enough for th average r uirements. The rewindinggz'ehanism is t erefore employed for re ding the film at a h' rate of speed. "i

the form shown, the rewinding mechanism includes a belt 39 connected to a pulley 40 on the spindle 11 and to a pulley 41 iny formed on a button 42. The button 42 is axially shiftable on the collar 25. and has a ratchet part 43, which is adapted to engage the pins 22- for locking the pulley 40 to the gear 26 when the button is manually de ressed.

o' secure the button 42 axial movement, it carries a pin 44 which rides in an annular groove 45 on e shaft 28. The pin 44 is yiel ly urged wardly by a spring 46 M to the hery of the button. Asshown in Fig. button projects th an open 47 in the wall 3. With this constructio the aabuttonfiandpinafiserveasaclu for 34 having alhub"35 fixed on the spindle 11.-

accidental connecting the rewinding belt to the operatmechanism.

the film I 1Q: from the feedreel 13 t0 the sprocket 14 and then to the film guideway, not shown, where it engages the feeding claw. It then p me: around the take-up s rocket on the shaft 9 and is wound onto e reel 7.1 which is driven by the belt 7. During this oseration of the machine, the gears, reels, an belts travel in directions opposite to those indicated by the arrows.

When it is desired to partiall rewind the film, the electric motor, not s own, is reversed, thereby causin the movin arts to travelas indicated by t e arrows. en the mechanism is reversed, the belt 32 drives the reel 13 through the clutch parts 34 and 36.

When it is desired to. rewind the entire film, as distinguished from merely reversing the mechanism, its free end is secured to the feed reel 13, a shown in Fig. 2, without passing around the feeding sprockets. The motor is then reversed so as to cause all the operating *zrts to travel as indicated by the arrows. en the parts are operating in reverse and the button 42 is not depressed, the 13 is rotated by the belt 32. To increase the of rewinding, the button 42 is pressed inwardly so as to connect the spindle 11' with the gear 26 which rotates at a very high speed.

During the rewinding operation, the belt 7 should 'be removed so as not to retard the speed of the rewinding mechanism.

To retract the button 42 to the position shown in Fig. 6, the operatin mechanism is driven forwardly instead 0 in reverse, thereby causing the pins 22 to ride along the inclined edges of the ratchet 43 so as to force the button voutwardl Although but one speci c embodiment of this invention has been herein shown and described it will be understood that numerous details of the construction shown may be altered or omitted without departing from the spirit of this invention as defined by the following claims.

W1 claim: h 1. cinemato p com rising a casing, a feed reel shaf znd a taiie up reel shaft on said casing, reels mounted on said shafts for sufipoporting a cinema film normally movable operating mechanism, driving means connecting said take upreel shaft with said operating mechanism for drivin said take the normal operation of the projector,

m the feed r el to the take up reel, i

u reel shaft durin the norms operation the cinematograp other means actuated in a reverse direction and mounted on said feed reel shaft for connecting said feed reel nec'ting said feed reel shaft with said operating mechanism for reversely driving said feed reel shaft at a greater speed than said other means.

2. A cinematograph comprising a casing, a feed reel shaft and a ta e up reel sha t on said casing, reels mounted on said shafts for supporting a cinema film normally movable from the feed reel to the take up reel, a reversible drive shaft rotatable in one direction for actuating said shafts to feed the film from the feed reel to the take up reel, driving means connecting said take up reel shaft with said drive shaft for driving said take up reel shaft during normal operation, other means actuated by said driveshaft in a reverse direction and mounted on said feed reel shaft for connecting said feed reel shaft with said drive shaft for reversely driving said feed reel shaft at a certain speed when said drive shaft is reversed, and rewinding mechanism also mounted on said feed reel shaft for connecting said feed reel shaft with said drive shaft for reversely driving said feedreel shaft ata higher speed.

3. In a oinematograph, a casing, a feed reel shaft and a take up reel shaft on said casing, reels mounted on said shafts for supporting a cinema film, said feed reel shaft being rotatable in one direction in feeding the film to the take up reel, operating mechanism, means mounted on said feed reel shaft and connecting said feed reel shaft with said mechanism for rotating said feed reel shaft at a certain speed in the opposite direction, and rewinding' mechanism also mounted on said feed reel shaft for connecting said feed reel shaft with said operatin mechanism for reversely drivilng said feed reel shaft at a higher 5 ee 4. In a cinematograph, a casing, a feed reel spindle on said casing, a feed reel on said spindle for supporting a cinema film,.

a take up reel, said s indle being rotatable in one direction in eeding the film from said feed reel to said take up reel, a belt mounted on said feed reel spindle for rotating said feed reel spindle in the opposite direction at a certain speed, operating mechanism, means connectin sai take up reel with said operatin mec anism for driving said take u reel uring normal operation, and rewin ing mechanism for reversely driving said spindle at a higher speed, said rewinding mechanism comprisin another belt also mounted on said s in le and a clutch adapted to connect said other belt with said operating mechanism.

5. In a cinematograph, a casing, a feed reel spindle on said casing, a feed reel on said spindle for sup orting a cinema film, a take up reel, said eed reel spindle being rotatable in one direction for feeding the during normal 0 eration, means mounted on said feed reel spmdle for rotating said feed reel spindle in the opposite direction at a certain speed, operating mechanism having a rotatable member, a manually operable button coaxial with said rotatable member and movable axially toward and from said member, coacting clutch elements on said member and button, and a belt also mounted on said spindle for connecting said feed reel s indle and button for rotating said s ind am the opposite direction to rewind t e film onto said reel at an increased speed, said clutch elements being automatically disengaged by the rotation of said rotatable member during the normal opera-' tion of the cinematogra h.

6. In a cinematograp a casing, a feed. reel spindle on said casing, a feed reel on said spindle for supportin a cinema film, a take up reel, said spindle ein rotatable in one direction for feeding the Im from said' feed reel to said take up reel, a rotatable operating member housed within said casing, a shaft supporting member, an axiall movable button on said shaft and projecting through an aperture in said casing, coacting clutch elements on the inner end of said button and on said operatin member, and a belt connecting said spind e and button for reversely driving said spindle and reel to' rewind the film, said clutch elements being automatically disengaged by the rotation of said operating member during the normal feeding of the film from said feed reel to said take up reel.

7. In a cinematograph, a casing, a feed reel s indle on said casing, a feed reel on said spin le for supporting a cinema film, atake up reel, a sprocket for feeding the film from said feed reel to said take u reel so as to rotate said spindle in one irection, a reversible drive shaft, gears housed within said casin and connecting said shaft with said sproc et, a driven shaft supporting one of said gears, an axially movable button on said driven shaft adapted for manual operation, said button projecting through an aperture in said casing, coacting clutch elements on said one gear and button and housed within said casing, and a belt connecting said button and splndle for reversely driving said spindle and reel to rewind the film.

igned at Chicago this 21st day of March 1930.

- AXEL A. MONSON.

ABRAHAM "SHAPIRO.

. film from saidfeed reel to said take up reel

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