US1838133A - Shutter for projecting machines - Google Patents

Description

Dec. 29, 1931. I B R H RDT 1,838,133

SHUTTER FOR PROJECTING MACHINES Filed Feb. 28, 1929 lllil'm Ll] l'l'TllIlllllIilildllll IN VEN TOR MZQ Patented Dec. 29, 1931 I I i ED STATES oi-Flies J'AKOB BURKHARDT, 015 DETROIT, MICHIGAN, Ai SSIGNQB TO LFHIIRJJ DIMENSION PIC- TUBES, INC., 01 NEW YORK, N. Y., A "GORPORATIONOF "NEW YORK SHUTTER FOR moments humans Application filed February 28, 1929. Serial No. 343:341. m

The main object of this invention is to pro- The sprocket 16-is adjustable on the shaft vide an improved shutter mechanism for pro- '18 V jecting machines which has very rapid open- With the pai t's theses-ranges, the shutters ing and closing action and which minimizes are drlven i-n synchro'nis'm "and at the same 5 flickering. speed but in opposite directions. They-are 3% Objects relating to details and economies of amngeds that their ed es overlap they my invention will appear from the descriprotat -see Fig.3, this bein'gtheclosed position to follow. The invention is defined and tion. The opening andclosingis very rapid pointed out in the claims. 1 anditis foundt'ominimize flickeringor flut- A. structure which is a preferred emboditeringin-the projected'pic'ture.

ment of my invention is illustrated in the ac- -I have especially designed my improvecompanying drawings, in which: ment's foruse in the projecting machine suc'h Fig. 1 is a front elevation of a projecting as is the subject matter-of my application for machine embodying the features of my inven- Letters Patent, Serial N0533-13309, filed J anv tion, the parts other than the shutter being uary "9, 1929. *My improvements are, howshown in conventional form. evegvery desirable for use in other relations. Fig. 2 is a fragmentary elevation looking I have n'otattempted-to illustrate or describe from the right of Fig. 1. the numerous adaptatio'ns, however, as it 'is Fig. 3 is a fragmentary view in section on believed that this disclosurewillenable those 7 line 3-3 of Figs. 1 and 2. skilled'in theart to embody 'o'r adapt-my imn Referring to the drawings, 1 represents a 'provement'sas m'ay be desired.

cabinet or housing of a projecting machine Having thus describedmy inv'erition,"what and 2 the lens thereof. These parts are claim as' 'n'e'wand desireto'secure by Letters shown in conventional form only. Patent, is: j

My improved shutter mechanism comprises '1. The combination in a "projecting 'maa supporting frame 3 carriedby the spaced chine, of a lens, longitudinally slotted rods 4:, the rame being adjustably mounted spindlesdisposed"inupright' relationand union these rods so that they may be moved to formlyspaced'relative to hevertioal central and from the Window of the projecting maplane of the lens, coacting gears on said 7 3 chine. spindles, a pair of "blade like shutters dis- "h The frame 3 is provided with bearings 5 posed in said slots in said spindles, the

and 6 for the spindles 7 and 8, these spinspindles being disposed centrally of the dies being vertically disposed in parallel reblades nd O tha edges of the-blades are lation and equally spaced relative to the vertig g 1I1t0 pp g Pelatlol} h Cal Central plane f the lens spindles revolve, and means for driving one The spindles are longitudinally slotted to of 351d splndles;

receive the blade-like shutters 9, these shut- The combma'tfon proleqtmg ters being secured in position by means of dune of a leps Spmdles dlsposed Spaced the screws 10 paltrallelhrelatilonhand on opposite sides of a The spindles are connected by the gears 11' p ane t mug t 6 center of the lens and m a) a lane arallel to the face of the lens aid that h i n at umfofm speeds and spihdles being longitudinally slotted, ion- PP dlrectlons' The spufdle 7 13 P necting gears on said spindles a pair of blade- Vlded Wlth a beveled gear 12 at lts lower end like shutters disposed in said slots. the

e pg Wlth abeveled gear 13 on the sjhaft spindles being disposed centrally of the 14,3118 Shaft ng Connected y the cha 1n 15 blades and so that the edges of the blades and the sprockets 16 nd 17 t0 h mg overlap when in closed position, and means shaft 18 projecting from the housing and suitfor driving one of said spindles.

ably connected to the film driving mechanism 3. The combinatlon in a. projecting mawithin the housing. chine, of a lens, spindles disposed in upright W0 relation and uniformly spaced relative to the vertical central plane of the lens and in a plane parallel to the plane of the lens, coacting gears 011 said spindles, a pair of bladelike shutters mounted on said spindles so that the edges of the blades are brought into overlapping relation as the spindles revolve, and means for driving said spindles in opposite directions at the same speed.

4. The combination in a projecting machine, of a lens, shutter spindles disposed in spaced parallel relation and on opposite sides of a plane through the center of the lens and in a plane parallel to the face of the lens, blade-like shutters mounted on said spindles so that the edges of the shutters are brought into overlapping relation as the spindles revolve, and coacting gears on said spindles whereby they are driven at uniform speeds in opposite directions.

The combination in a projecting machine, of a lens, a pair of blade-like shutters mounted to rotate on parallel axes disposed in a plane parallel to the face of the lens and so that their edges are brought into overlapping relation as they revolve, and means for driving said shutters at the same speed and in opposite directions.

6. The combination in a projecting machine, of a lens, a pair of shutters mounted to rotate on parallel axes uniformly spaced relative to a central plane of the lens and disposed in a plane parallel to the face of the lens, and the means for driving said shutters at the same speed and in opposite directions.

7. The combination in a projecting machine, of a lens a pair of shutters mounted to rotate on spaced parallel axes disposed in a plane parallel to the face of the lens and so that their edges are brought into overlapping relation as they are rotated, and means for synchronously driving said shutters.

In Witness whereof I have hereunto set my hand.

JAKOB BURKHARDT.

Images