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Oct. l, 1946. A " ì B, E, MlLLS FILM CLEANING DEVICE Filed June 1_8, 1942 2,408,438 i f 5 Sheets-Sheet 1 oct. 1, 1946.y ’ B, E, MILLS I FILM Y CLEANING DEVICE 2,408,438 _ Filed June 18, 1942 @i 5 Sheets-Sheet 2 jj M'. oct. 1, 1946. B, E MILLS ì ` 2,408,438 FILM CLEANING DEVICE Filed June 18, 1942 ’ » _ 5 Sheets-Sheet 4 p05 001:. l, 1946. B. E, MlLLs v 2,408,438 FILM CLEANING DEVICE Filed June 18; 1942> 5 sheetsfsh'eet 5 100 7711611 07'.' 2,408,438 Patented Oct. 1, 1946 UNITED STATES PATENT OFFICE 2,408,438 " FILMl CLEANING DEVICE Bert E. Mills, -Oak Park, Ill., assigner to Mills Novelty' Company, Chicago, Ill., a corporation of Illinois 1' Application June 18, 1942, Serial No. 447,605 10 Claims. (Cl. 15-100) This invention relates to a device for cleaning motion picture ñlm and is adapted for use as an attachment to a motion picture projector so as to clean the film in the course of its travel from the ñlm coil to the projector lens. It is, however, also adaptable for use at other points or in con nection with other film handling apparatus, as, for example, ñlm winding apparatus or means for transferring the film from one reel to an 2 and wiring by which the operation of the device is controlled; and Fig. '7 is a continuation of Fig. 6, showing the master relay and the starting switch, which may be coin-controlled. In said drawings the ñlm coil, indicated by the reference numeral II is mounted in a film holder I2 supported on a frame I3 of a motion picture projector. The film from the coil is paid out from the center by means of a pay-out roller I4, which preferably is angularly mounted and di The principal object of the invention is to pro rectsV the film into a plane of travel laterally dis vide a device whereby, a film cleaning solution posed with respect to the film coil Il, in which may be uniformly applied to the film through plane it passes through theV projector, being then the medium of ñlm wiping elements and in which returned exterior of the coil on which it the control of said elements and the feeding of 15 is wound tobythe rotation of the coil. The film is the cleaning solution thereto are controlled in drawn from the inside of the coil by means of such manner as to obtain the desired result with a feed sprocket I5 of the projector mechanism a minimum amount of complication and diffi and passes around a guide roller I6, the pay culty. ` roller I4, a guide roller l'l, and additional A further object of the invention is to provide 20 out guide rollers I8, I9 and 2l to said sprocket I5. in such a film cleaning device means for causing The film, which is identified by the numeral 22, the device to become inoperative when the sup then passes through the projector lens mecha ply of cleaning solution becomes exhausted or nism, generally indicated by the numeral 23, and reaches a predetermined low level inthe recep over a sound head roller 24, a second sprocket tacle from which it is supplied. ' , ' 25 25 and rollers 26, 21 and 28 back to the coil Il. A further object of the invention is the pro The pay-out roller I4 is, or may be, driven by vision of means for controlling the movement of means of a belt 29 from a source of power (not the elements of the film wiping device into and shown) for thesprockets I5 and 25. The pro out of engagement with the film in coordination jector mechanism is not described in further with the supply of 'cleanin'g'solution to said ele 30 detail since it is believed that other details there ments so that such solution is supplied only when of are'not essential to an understanding of the other. , they are in operative position. ' ' ‘ present invention. Other objects and advantages of the invention As the film passes between the rollers IB and will be apparent from the following description I9 it is cleaned by the device of my invention 35 of a preferred embodiment thereof, taken in con which includes two pivoted wiper elements 3| nection with the accompanying drawings, in and 32 which carry pads 33 of felt or like ab which: „ ’ sorbent material adapted to be moved into en Fig. 1 is a side elevational -view of a motion gagement with opposite sides of the film when picture projector equipped with the nlm cleaning 40 the. cleaning device is operated, as will be here device of my invention; inafter described. Fig. 2 is an enlarged frontvview, partly broken Cleaning solution is supplied to said pads from away, showing portions of the film cleaning de a tank 34 through pipes 35, the rate of flow being regulated so that said solution will drip onto vice; Fig. 3 is a sectional and elevational. view of 45 said pads at a desired rate of flow controlled by means of hand-operated valves 36 extending into the supply tank for the cleaning solution and ther couplings 31 screwed into bosses 38 on the bot valve mechanism for controlling the flow of so tom of the tank 34, said couplings each having lution therefrom, being takenfsubstantially on staggered passages 39 and 4I therein, with an the line 3-3 in Fig. 2; Fig. 4 is a top plan View of the mechanism 50 opening 42 communicably connecting the same, and with the point of the valve member 36 ex shown in Fig. 3; tending into said opening to a variable extent Fig. 5 is a sectional view taken substantially depending uponV the position of adjustment of on the section line 5-5 of Fig. 3; the valve. (See Fig. 3'.) Fig. 6 is a diagrammatic view of certain of the electromagnets and other electrical devices 55 >In the bottom ofthe tank 34 there is pro 3 ¿2,408,438 vided a plate 43 supported upon a spacer ring 44 to which said plate is tightly secured by means of screws 45. Said ring 44 and plate 43 provide the side and top walls, respectively, of the liquid level in the tank 34 falls to a predeter mined point. The connections between the above-described magnets and switches and with the source ol' power are made through suitably located terminal blocks |03 and |04. The connections to the a relatively small chamber 4G which communi cates through openings 41 in the bottom of the tank 34 with the passages 39 in the couplings 31. source of power and to a master relay shown in There is an opening 48 in the plate 43 into Fig. '7 are indicated at |02. which extends the pointed end oi' a valve member In said Fig. 7 ï have shown a line connection 49 which is disposed vertically through the cover im) and a master relay Hill’. The latter comprises 5| ci the tank 34 and through a guide member a magnet |05, an armature |05 which is normally 52 formed on the top of said plate 43. biased to open position, and a switch lill com The upper end of said valve member 49 is com prising a ñxed member |98 and a movable mem nected by means of a pin '53 with a lever 54 piv‘ ber |09 which is connected to a projection lll oted at 55 to ears 56 on the cover 5|, said lever carried at the end of the armature |06. Thus 54 being connected by a link 51 with an arma when the magnet |25 is energized said switch |31 ture 58 of an electromagnet 59 carried upon a Y is closed and when it is deenergized the switch is support 6| on a bracket 52, which is welded or opened.> otherwise secured to a bracket S3 on which the For controlling said master relay |65’ a switch tank 34 is supported, the latter bracket being in | |2 is provided, comprising a iiXed member l i3 turn supported upon a frame arm 64. and a movable member H4, the latter being bi~ The armature 58 is pivoted at 65 to a lug 65 on ased to closed position and normally held in open the bracket 82 and is normally held in the raised position by a projection H5 on the end of a piv position shown in Fig. 3 by means of a spring Gl' oted lever Hä which rests on a pin ll'l on a secured at the upper end to a projection 63 on ratchet wheel ||8 of a coin control device ol’ said armature 58, and at the other end to a lug @il known construction. Said wheel is spring-biased on the bracket G2. to rotate in clockwise direction and is permitted In the tank 34 there is provided a iloat 1| car to move one step in such direction for each coin ried at the end of an arm 12 which is pivoted at deposited, such movement being controlled by an 13 to ears 14 on the top of a plate 43. A push î escapement lever ||9 connected by a link |24 rod 15 is secured to said arm 12 intermediate the with an armature |25 of a step-up solenoid |26 ends of the latter and extends upwardly through in circuit with a coin switch |21. Upon the iirst the cover 5|, having at its upper end a head 16 step the pin Iíl moves downwardly a sufficient engaging a lower spring member 11 of a switch 1S. Said member 11 and an upper member T9 y, distance to permit the lever liü and projection H5 thereon to move far enough away from the of said switch are mounted in vertically spaced switch member ||4 to allow the switch H2 to relation in a post 8| on said top member 5| of the close. A step-back solenoid |21, controlled by tank 34, and are connected into an electrical cir a cut~oiï switch |28 and having an armature |22 cuit by means of wires 82 and 83 sho-wn in Figs. carrying a pawl |23, arranged to engage the 1, 4 and 6 of the drawings. teeth of the ratchet wheel ||8 serves to turn said A filler cap 84 is provided on the cover 5|, wheel back one step for each cycle of operation through which a cleaning solution, such, for eX in manner which will be understood by those ample, as carbon tetrachloride, may be poured familiar with coin devices of this general char into said tank 34. acter, and when the pin ||1 is restored to its A second magnet 85 is supported at the lower 45 original position the lever | i6 and rod l i5 will be end of the bracket 63 and beneath said magnet is raised to the point that the switch | i2 will be a pivoted armature 86 carrying at its outer end a opened, thus terminating the operation oi' the roller 81 disposed between lower extensions 8B and machine. 89 on the arms 3| and 32. Said arms 3| and 32 are spring-biased or weighted so as to normally be in open position with the pads 33 separated, and said extensions BS and 89 diverge from the pivot The closing of the switch lill, in conjunction 50 with the operation of the master relay Ifit’, causes the roller 81 moves upwardly ‘between said ex tensions the upper parts of the members 3| and the magnets 59 and 85 to be energized, thereby opening the valve i521, 49 (Fig. 3) and moving the wiper armsI 3| and 32, and the pads carried thereby, into operative relation to the film 22. Drops of cleaning solution are 'then supplied to 32 will be moved toward each other, bringing the pads 33 into contact with the i'ilm 22. A third magnet, identified by the numeral S2 same passes there-between. This condition con tirrues until the master relay opens or the mag 9| on which said arms are mounted so that when the pads 33 and the latter clean the iilm as the net 92 is deenergized by the opening of the switch (see Fig. 6) , is provided for controlling the ener gization of the valve magnet 59 and cleaner mag 60 18 which is controlled by the liquid level in the tank 34. Thereupon the magnets 59 and 55 are net 85, said magnet 92 being mounted in a con~ deenergized, with the result that the valve 42, 49 veniently located box (not shown) on the frame is closed by upward movement of the armature of the projector. The circuit, including wires Q3 58 when released by the magnet 5.3 and the wip and 94, to said magnet 92 is adapted to be mo mentarily closed by means of a manually oper 65 ing elements are moved to inoperative `position in consequence of downward movement ofthe roller able switch 95. When energized, said magnet at~ 81 when the armature 86 is released by the mag tracts an armature G5 which is connected to mov net G5. able members 91 and 90 of switches 99 and lill, When the tank is refilled to the point that the respectively, both of which are closed by move switch 18 is closed and when the master relay is 70 ment of said armature toward the magnet. The again energized, the wiping device can again be switch 99, being in parallel with the switch S5 rendered operative by momentary operation of causes the magnet 92 to remain energized after the switch 95 and the cycle `of operation will then momentary operation of the switch '95 until the be repeated. circuit is broken by opening of the switch 18 when 75 The foregoing detailed description has been .amarres `5 therefrom, but the appended claims should be netic means for controlling the movement of construed as broadly as permissible in view of the prior art. I claim: 6 ments engageable with the iilm in a course oi' travel of the latter, means for'supplying a clean~ ing solution to said Wiper elements, electro-mag given 'for olearness of understanding only, and no'unnecessary»limitations should be understood said wiperelements into and out of operative CF1 position, electromagnetic means for controlling 1. A film cleaning device comprising movably mounted wiper elements disposed, respectively, on oppo-site sides of the iilm, electrically~controlled actuating mechanism for moving said Wi 10 per -elements into contact with the film in a course of travel of the latter, said Wiper elements the supply of said cleaning solution to said wiper elements, and means for controlling both said electromagnetic means to cause the same to be energized and deenergized simultaneously, where by cleaning solution is supplied to said Wiper ele ments only when the latter are in nlm-engaging position. being equipped with absorbent contact pads, a supply tank for cleaning solution, an outlet valve 6. A film cleaning device comprising wiper ele for said tank, electromagnetic means for con 15 ments engageable with the nlm in a course of travel of the latter, means for supplying a clean~ trolling the operation of said valve, means under ing solution to said Wiper elements, electromag the control of an operator for causing energiza netic means for controlling the movement of said tion of said electromagnetic means to open said wiper elements into and out oi operative position, valve, means coordinated with said wiper-actu ating mechanism for supplying the cleaning so 20 electromagnetic means for controlling the sup ply of said cleaning solution to said Wiper ele lution from said tank to said absorbent pads with ments, and means, including a control magnet, a regulated rate of flow only When said Wiper for causing simultaneous energization oi both elements are in operative position, and means said electromagnetic means at the beginning of controlled by the volume of the solution in said a period of operation to move said wiper ele tank for causing deenergization of said electro ments into contact with the ñlm and to cause magnetic means and closing of said valve when feeding of said cleaning solution to said elements, the quantity of cleaning solution in the tank deenerglzation of said control magnet causing drops to a predetermined point. simultaneous deenergization of both said electro» 2. A film cleaning device comprising Wiper ele magnetic means to cause movement of said wiper ments movable into contact with the nlm in a 30 elements out of film-engaging position and to cut course of travel of the latter and equipped with oil the flow ci cleaning solution thereto. absorbent contact pads, a supply tank for clean '7. A ñlm cleaning device comprising Wiper ele ing solution, an outlet valve for said tank, elec ments engageable with the iilm in a course of tromagnetic means for controlling the operation travel of the latter, means for supplying a clean of said valve, means under the control of an ing solution to said wiper elements, electromag~ operator for causing energization of said elec ietic means for controlling the movement of said tromagnetic means to open said valve, means for conducting the cleaning solution from said tank to said absorbent pads with a regulated rate of flow, and means arranged to be automatically 40 operated after predetermined operation oi the device to cause deenergization of said electroH magnetic means and closing of said valve. Wiper elements into and out of operative posi tion, electromagnetic means for controlling the supply of said cleaning solution to said wiper elements, means, including a control magnet, for ycausing simultaneous energization of both said electromagnetic means at the beginning of a period of operation to move said wiper elements 3. A film cleaning device comprising Wiper ele ments movable into contact with the film in a 45 into contact with the nlm and to cause feeding course of travel of the latter and equipped with absorbent contact pads, a supply tank for clean ing solution, `an outlet valve for said tank, elec tromagnetic means for controlling the operation of said valve, means under lthe control of an 50 operator for causing energization of said elec tromagnetic means to open said valve, means of said cleaning solution to said elements, deen ergization of said control magnet causing simul taneous deenergization of both said eiectromag netic means to cause movement of said Wiper elements out of nlm-engaging position and to cut off the íiow of cleaning solution thereto, said means for supplying cleaning solution including a supply tank, and means controlled by the vol for conducting the cleaning solution from saidv urne of cleaning solution in said tank for caus~ tank to said absorbent pads with a regulated rate of flow, and means arranged to be auto 55 ing deenergization of said control magnet When said Volume falls to a predetermined point. matically operated after predetermined operation VA film cleaning device comprising Wiper ele of the device to cause deenergization of said ments engageable with the iilm in a course of electromagnet means and closing of said valve travel thereof, means for supplying cleaning so~ and to cause said movable Wiper elements to move out of nlm-engaging position. 60 lution to said Wiper elements, and electrically operated control devices for moving the wiper 4. A iilm cleaning device comprising Wiper ele elements into and out of engagement with the ments movable into contact with the ñlm in a iilm and for causing the feeding of cleaning so course of travel of the latter, a supply tank for cleaning solution, an outlet valve for said tank, lution to said wiper elements only when they are electromagnetic means for controlling the opera 65 in film-engaging position. tion of said valve, means under the control of 9. In a motion picture projector, a film clean an operator for causing energization of said elec ing device comprising Wiper elements engage tromagnetic means to open said valve, means for able with the ñlm in the course of travel thereof conducting the cleaning solution from said tank from the film coil to the projector lens, a supply to said wiper elements with a regulated rate of 70 tank from which cleaning solution may be sup flow, and means arranged to be automatically operated after predetermined operation of the device to cause deenergization of said electro magnetic means and closing of said valve. 5. A iilm cleaning device comprising Wiper ele plied to said Wiper elements, an outlet valve in said tank, and electrically-operated means for controlling operation of said nlm Wiper elements 75 and said outlet valve, whereby the valve is opened 2,408,438 substantieily simultaneously with movement of said-Wiper elements into nlm-engaging position. 10. In a. motion picture projector, a, ñlm clean ing device comprising Wipers movable into and 8 able, electrically-controlled mechanism responsive to actuation of said starting element for moving said wipers into nlm-engaging position and, after a. predetermined film-cleaning operation, caus out of engagement with the ñlm in the course 5 ing disengagement thereof from the film. of travel thereof, control means including a man ually operable starting element and power~oper- BERT E. MILLS.