US1576404A - Picture-projection machine - Google Patents

Description

March 9 1926.

PICTURE PROJECTION MACHINE Filed Oct. 28 1925 2 Sheets-Sheet l J. R. BRADFORD March 9 1926.

PICTURE PROJECTION MACHINE 2 Sheets-Sheet 2 Filed Oct. 28, I925 :iii: s m

ate ntcd Mar. 2, 19..

JAMES E. IBFORD, OFQAN ERMG'CISCE), GALIEORNIA.

EICTURE-PEOJEGTIH MACHmEi Application filed October 2d, 1525. serial 1%. $55,354.

To all wkom it my comem:

it known that I, JAMES R. BRADFORD, a citizen of the United States, residing at San Francisco, in the county of San Francisco 5 and State of California har e invented cer tain new and useful improvements in Pic-- ture-Projectio Machines, of which the following is a spe iification.

This inventiomrelates to certain new and useful'improvements in picture projection machines and more particularly to a machine of this type for advertising purposes. The primary objects of the invention are to provide a novel form of rotary film holder m which not only continuously repeats the advertising matter, but which also enables any film, whether erforate or imperforate and of any desire$len h, within the range of the holder, and varying widths within 30 the range of the diameter of the lens, to be employed, and which also enables any part length.

of the film to be removed acglreplaced by vide a machine of this type which isolates the film from the lamp, thereby to prevent drying-out of the film, and also eliminating M fire risk.

Still'another object of the invention is to provide a novel form of means for proecting the advertising matter, and also one which may be varied so as to enable such m matter to be projected in various directions.

The invention also aims to rovide a machine of this type which is reliable in operation, of simple, economical and compact con struction and which reduces to a minimum the chances of becoming out of order.

In the drawings Fig. 1 is a front elevation of the invention, partly broken away and in section;

Fig. 2 is a section on line 2-2 of Fig. 1; Fig. 3 is a section on line 3-3 of Fig. 1; Fig. 4.- is a detail perspective view of the prism and lens carrier;

Fig. is a section on line 5-5 of Fig. 1;

gig. 6 is a section on line 6-43 of Fig. 2, an

Fig. 7 is a section on line 7-7 of Fig. 6. In proceeding in accordance with the present invention, a housing or casing 1 is employed which preferably has a hinged cover 2 having-openings 3 and. 4 to register with the lens 5 and prism 6 respectively.

The film holder consists of a wheel 7 mounted within'the housing on a. spindle 8, the latter being secured to the back of the housing in any suitable manner. The driving power for the wheel preferably consists of an electric motor 9, although other driving means of any desired type may be employed if desired. A pulley 10 is driven from the motor shaft 11 and has a belt 13 trained thereover, the belt being also trained over a larger pulley 14. The pulley 14 is carried by a shaft 15 which latter is journa'led in a swinging bracket 16 carried by the housing and tensioned by a coil sprin 16. El small friction wheel 18 is mounte on the shaft 15 and engages the rear face of the wheel 7 so as'to drive the latter from the motor.

A circular and preferably less band 19 is secured to the wheel 7 and projects outwardlg from a side face thereof, the glass band ing secured in place by an suitable means, such as screw clamps 20. X band of glass or celluloid 21 is disposed within the glass band 19 and which sup orts the film 22, whereby it will'be noted t at the film is held clam ed by and bet-ween the two bands.

A brac et 23 is carried by the spindle 8 of the film holding wheel 7 and has the lens 5 and prism 6 mounted thereon. The lens and prism are equipped with nuts and screws 24 and 25 operatmg through a slot 26 in the bracket, whereby adjustment of these parts may be edected. The bracket has a collar 27 which receives the front end of the spindle, and, a set screw 28 carried by the collar and engaging-the spindle. v

The lamp housing 29 carries the usual lamp 30 in front of which latter is the usual condensing lens 31. The lamp housing is disposed on the exterior of the housing, being connected to an end wall thereof, so as to permit the housing to be adjusted vertically and-horizontally. A framing slide 32 is carried by the housing 1 and is interstoppage of the motor, a, sleeve 33 is secured to the back of the casing by a nut 34, and receives therein the shank 35 carrying a wheel 36. A coil spring 37in the. sleeve tensions shank 35. A pin 38 is carried by the shank and extends through a slot provided therefor in the sleeve. A' contact 39 is carried by the pin 38 and is engageable with a' pair of spaced contacts 40 carried by an end of the casing. A second pin 41 is carried by the shank 35 and projects through the sleeve and is connected to a spring 42 which latter in turn is connected to the said casing end. The contacts -40 are connected by wires43 to the lamp 30. The wheel 36 engages the back of the wheel 7 and is normally held by the spring 42 in the tilted position of Figure 1 with respect to the back of wheel 7.

In operation, the film is first positioned beneath the glass band 19, and is held en.

gaged therewith by the celluloid band 21. Upon starting of the motor and lighting of the lamp, the light rays will be projected through the condensing lens 31 and through the opening of the framing slide 32 and thence will be projected through the glass band, the film and the celluloid band into the projecting lens 5 and the prism 6, the latter projecting the picture through the opening 4 of the hinge cover 2. The projecting, thus occurs at rlght angles to the direction in which rays from the lamp are projected. The lamp housing'may be adjusted so that it can be turned to permit the back of the housing 1 to be placed flat or seated against a horizontal support, or in other words to lay the machine on its back, and then by use'of a second prism placed in a position against the prism 6, the picture can be deflected to move in a side to side position rather than .from the bottom upward.

Upon rotation of the wheel 7 it will be noted that same will move the wheel 36 out of its tilted position and thus cause the contact 39 to connect the contacts 40, thus closing the circuit through the lamp. Upon stoppage of wheel 7 the spring l2 will turn shank 35 and thereby tilt wheel 36 to move contact 39- out of engagement with contacts 40 and thus open the circuit through the lam l hen the machine is being operated, the image is constantly moved upward. or sideways across the film, similar to the moving titles now commonly used in theatres to announce coming attractions.

From the foregoing it will be seen that the invention enables either perforated or imperforated films to be used with equal success. The imperforated films are cheaper. Inaddition any part or segment of the film can be readily removed and replaced by another part or segment of equallength, and due to the entire film being mounted in the form of a circle, the picture will be con stantly repeated without any attention on the part of the operator.

By treating the glass bandwith emulsion alllld. printing from the negative directly on t e feet will be roduced.

What is c aimed is 1. In a picture projection machine, a wheel, a spindle on which the wheel is mounted, a circular transparent band secured to the wheelv and extending laterally from a side'of the latter, means to secure glass, a circular stereopticon slide efa film in engagement with the transparent circular transparent means having a close fit relative to the holding. face so as to engage the film throughout its circumference to frictionally and removably hold same against said face, means to rotate the holder, means exteriorly of the holder to project light rays through the film, a projection lens arranged between the film and the axis of rotation of the holder and a prism arranged in front of the projection lens, the

,light projecting means, the lens and prism being all arranged in alinement whereby the image received and projected by the lens will be projected by the prism at an angle to the plane in which the holder rotates.

3. In a picture projecting machine, a filmcarrying holder having a circular and transparent film holding face, a removable circular transparent means having a close lit relative to the holding face so as to engage the film throughout its circumference to frictionally and removable hold same against said face, means to rotate the holder, means to project light ra s through the film, a pro ection lens and a prism arranged to receive and project the image from the lens.

In a picture projection machine, a wheel, a spindle on which the wheel is mounted, a circular transparent band secured to the wheel and extending laterally from a side of the latter, means to secure a film'in engagement with the transparent band, means exterior-1y of the wheel to proill) ject light rays through the film, a projection lens and a prism, and means to support the lens and prism by and from the wheel spindle, the prism being arranged to receive rays from the projecting means and to project same at an angle to the plane in which the wheel rotates.

5. In a picture projection machine, a wheel, a spindle on which the wheel is mounted, a circular transparent ban-u secured to the wheel and extending laterally from a side of the latter, means secure a 'lilm in engagement with the transparent band, means exteriorly of the wheel to project light rays through the film, a slotted 15 bracket mounted on the spindle, a projection lens and a rism on the bracket each having a nut an screw extending through the slot of the bracket to adjustably connect the lens and prism to the bracket, the 2

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