Патент USA US2406136код для вставки
Aug. '20, 1946. J. P. CORCORAN 2,406,136 ANTIBUCKLING DEVICE FOR FILM vFEEDING MECHANISMS Filed April 17, 1944 ’ 'Fi.1. L Mo’toi To a . m , . ql..1m.trw. m I. .‘ ...H w "__. _FJItT/MO INVENTOR Jamoa P Corcoran A'r'roRN EY Patented Aug. 20, 1946 2,406,136 UNITED STATES PATENT OFFICE, 2,406,136 ANTIBUCKLING DEVICE 'FOR FILM FEEDING MECHANISMS James Patrick Corcoran, W'est Los Angeles, Calif., assignor to Twentieth Century-Fox Film Cor poration, Los Angeles, Calif., a corporation of New York 1 Application April 17, 1944, Serial No. 531,510 2, Claims. (01. 2,0Q—r-52) 2 This invention relates. to the cinetechnical art and deals particularly with a means for pre venting buckling in motion picture ?lm While being run through cameras or the like. The, invention to be described hereinafter has recorder, with the. front door~.removed,_ showing how my device would. be installed therein; Figure 2 is a schematic view of an electrical circuit which, may be used with the device as it is shown in Figure 1; been developed in connection with asound cam era which is more commonly called in the art a sound recorder, However, as the description Figure 3 is a view of a different type of sound recorder showing the application of two of ,my proceeds it will become apparent to cine-tech Figure 4 is .a schematic diagram showing the electrical circuit which may be used in conjunc tion with the device shown in Figure 3. Brie?y stated,- my invention may be broadly stated to comprise a toggle-type switch having nicians that the means disclosed will operate equally as well in cameras which take pictures, or in projectors, or in. any type of apparatus where the ?lm is moved through the machine by mechanisms, devices; and ' push buttons for opening and closingthe switch, The chief object of this invention is to provide 15 together with means for mounting the switch a device which automatically operates to stop in the camera along the path of-travel ofl'the the ?lm moving mechanism in a camera when ?lm so vthat the ?lm will operate a member ever the ?lm does not ,follow its usual .path which actuates the switch whenever the ?lm through the camera. In sound cameras it has leaves its normal path of travel. In other words, been the experienceof operators that the take 20 if the ?lm magazine take-up fails to operate, up spool which draws the ?lm out of the camera the ?lm necessarily will accumulate in the cam into the magazine‘ sometimes will fail to take era compartment and will be forced to leave its up the ?lm sul‘?ciently fast to clear it from the normal path of travel therein. My device is so take-off sprocket, in the camera or will fail to take the ?lm away altogether, thus allowing it to accumulate in the camera. Since the operator has no way of immediately knowing when this occurs, it sometimes happens that the ?lm will pile up in the camera to such an extent that it will pack between the sprockets and rollers and strain the bearings. At times ithas been known to actually damage bearings, rollers, and casings. To prevent the above, I conceived of an ar set and arranged that as soon as the ?lm does leave .its accustomed path it engages a member which in turn operates the switch, The result that the power is shut off to the motor and the whole machine stops immediately. In prac tice, this has been found to substantially elimi nate all ?lm packing in cameras. ~ Referring more speci?cally to’ the drawing,‘ it will be seen in Figure 1 that I haveinstalled my arrangement in a sound camera generally desig nated l ‘I. The camera comprises a conventional rangement whereby the ?lm, upon. leaving its ; light-tight case l2 having a ‘door which closes regular path in the camera, would trip, a switch which in turn would actuate attendant mecha nism to shut olf the power to the motor which drives the machine. The location of the switch becomes important in view of the fact that most of the trouble occurs at the take-off sprocket in the camera, due to failure of the take-up spool in the magazine. Sincethis was the point where the ?lm was most apt to buckle, I decided to place my device at this particular point so as to the same but which is not shown inv this view. Mounted upon the case I2 is a ?lm magazine eliminate any trouble from this source. I also realize that ‘there are other points in the ?lm travel that need attention. Therefore, in the drawing. and description it will be found that I have shown and illustrated more than one place 2‘ in which mydevice may be applied Other ob jects and advantages will become. apparent as thedescription proceeds in conjunction with the generally designated '13 which feeds ?lm into and out of the camera case l2. As shown in this 'view, the ?lm F enters the magazine at 9 and leaves the magazine at In and flows through the cam era in the direction of the arrows l4 and I5. Be tween 9 and I0 the ?lm moves in its customary‘ path over guide rollerhl?, feed sprocket I 'I,‘ where it is clamped in position by clamping rollers 18, and from there in its usual path over the stabiliz ing recording drum l9. From the drum 19 the ?lm follows back to the sprocket I‘! and is clamped on the lower side of the sprocket I‘! by clamp rollers 20. From here it passes overguide rollers 2| and 22, from which point it passes out of’ the case at the point l-ll. Since the feed sprocket-l1 isthe driven member of the mechanism and is geared to the ?lm, it can readily be seen that if drawing in which: Figure lis a fragmentary view of a sound ‘55 the ?lm should ‘fail to ‘be removed from the maga- ; 2,406,136 3 4 zine at the point In it would accumulate around the rollers 2| and 22. The roller 2|, being near est to the sprocket II which feeds the ?lm, has been used as the particular roller with which I associate my device. As will be noted here, my device comprises a switch generally designated S. engages a button 35 which operates the switch SI and extends to a position close to the face of the wheel of the sprocket. Under this set-up it would be impossible for ?lm to wrap around the sprocket wheel 33 between the ?nger and the face of the wheel without pressing the ?nger 34 and The switch is of the toggle type with push but actuating the switch SI, which would in turn operate the relay switch to disconnect the motor tons 23 and 24, which are for the purpose of from the source of electrical supply. putting the switch in an “on” and “off” position. The electrical circuit for operating the two In this case the button 23 puts the switch in an 10 switches is shown in Figure 4. Here it can be “o?” position, while the button 24 puts it in the reverse, or “on” position. Pivotally mounted upon the switch S is a depending member 25 seen that the switches S and SI are in series in the circuit embodying a battery BI and a relay switch RI. In this case the switches SI and S2 which is shaped to ?t the circumference of the roller 2| and hangs in a position close to the 15 being in series, the relay RI must hold contactors 36 and 31 in a closed position when the switches roller. The purpose of this member 25 is to en are closed. I am aware that there are other ways gage the ?lm F if it leaves the roller 2| to any of doing this; for instance, the relay switch RI extent and, if the ?lm presses the member 25 could be in a closed position when deenergized, in sufficiently so as to move it slightly, it will in turn press the button 23 which will throw the 20 which case the switches S and Si could be par alleled and could be actuated into a closed posi-_ switch S into an “off” position and shut off the tion by the ?lm. motor that drives the machine. A device of the above nature has been found Another way in which the switch may be actu to eliminate all ?lm buckling due to failure of ated would be for the ?lm F to cling to the teeth on the sprocket wheel I‘! and ride up into the 25 magazine take-ups or any other deviation of the path of the ?lm through cameras. space between the member 25 and the periphery In practice it has been found to be desirable, of the wheel. To prevent the ?lm from riding in view of certain precautions which have to be past the switch and into the upper part of the used in machines of this type, to use a push but sprocket where it would become jammed with the incoming ?lm, I provide a stripper plate 26 which 30 ton toggle switch. This type of switch has two positions, an “on” and “off” position, which re is arranged to strip the ?lm from the face of the main ?xed until changed. Accordingly, since it sprocket wheel and force it against the member is possible for the switch to be in the wrong posi 25. The result is that if any ?lm ever follows tion at times, it is necessary to provide means the sprocket wheel up to this point, it is forced whereby the operator could assure himself that against the member 25 and the switch may be the switch was in the proper position before the actuated in this manner. machine was started. For this purpose I provide In Figure 2, I have shown how the switch op an external arrangement for setting the switch erates to shut down the motor which drives the in the proper position for running. The means camera. Here it can be seen that the switch S is installed in a circuit comprising a battery B 40 for this purpose is best shown and illustrated in Figure 1. Here it will be seen that I have and a relay switch R. The circuit comprising the mounted a rod 38 in the wall of the casing l2. battery, the relay, and the switch S is grounded The rod 38 is formed on the outer end with a as shown at 21 and 28. However, in place of the head 39 and carries on the inner end a member two grounds I may use a conductor circuit if de sired. The relay switch R operates contactors 45 4-0 which is ?xed thereto in any suitable manner. The member 40 is provided with an arm that 29 and 3!! which constitutes a, switch placed in the carries a button 4| arranged to engage the but conductors between the source of electrical sup ton 24 when the rod 38 is pushed inwardly. A ply and a motor (not shown) which operates the spring 42 normally keeps the rod extended ex camera. As a precautionary measure, I may in corporate a manually operated switch 3| which 50 ternally so that the ?lm F passes freely between the buttons 24 and 4|. Under this arrangement would be for the purpose of closing the circuit the operator, before starting the machine, assures through the .relay switch R, 50 that the motor himself that the switch S is in the proper posi may be disconnected by hand as well as by auto tion by pressing the knob 39. This precaution is matic means in the camera. The foregoing de necessary since the switch S may inadvertently scription deals with a single installation of my be moved into the improper position when‘thread device for preventing ?lm buckling at a speci?c ing the machine. With this device the door to point in the camera. the recorder may be closed and the switch reset In Figure 3, I have shown how my idea may be at any time thereafter. In Figure 3, I have shown embodied in a different type of sound recorder. the same arrangement with respect to switch S Here it will be observed that I have incorporated but have left the switch S| open for resetting by a switch S which is identical with the switch de hand. In this case the switch Si is in the open‘ scribed hereinabove and have also incorporated a so that it can be seen by eye and can be manually second switch Si. The path of the ?lm Fl through reset. . this arrangement is obvious. It passes over a sprocket 32 in identically the same manner as it I claim: passed over the sprocket I‘! in Figure 1. The posi tion of the switch S in this arrangement is also identical with that shown in Figure 1. However, in this view there is another feed sprocket 33 which introduces another possibility of ?lm breaking and 1. In a power driven machine for handling . being wrapped around the sprocket wheel 33, thereby causing damage at this point. To pre motion picture ?lm or the like, a feed sprocket for passing ?lm through said machine, a switch for controlling the power for said machine near said feed sprocket, and a stripper plate associated with said feed sprocket arranged to strip ?lm from said feed sprocket when said ?lm leaves its vent this possibility, I mounted a second switch SI close to the sprocket wheel 33 and ?xed a spring ?nger 34 on the switch so that the ?nger and force the stripped ?lm to operate said switch. 2‘. In a machine for handling motion picture customary path with respect to saidfeed sprocket, 2,406,136 5 ?lm or the like, power driven means for passing ?lm through said machine, said means including a feed sprocket and a guide roller, a switch for controlling said power driven means having a movable member extending near said roller 5 adapted to be engaged by ?lm leaving the roller to operate said switch, and a, stripper plate ar 6 ranged to strip ?lm from said feed sprocket and force the stripped ?lm to engage said movable member and operate said switch when the ?lm leaves its customary path with respect to said feed sprocket. JAMES PATRICK CORCORAN.