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104
MOTOGRAPHV
Vol. XII, No. 3.
Recent Patents in Motography
By David S. Hulfish
No. 1,057,234. For an Improved Film Tension Device for Motion Picture Projectors. Issued to Carl Green, Logansport, Ind.
This invention has for its object the provision of a
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moving tension device for the film while in the film gate, instead of the usual fixed spring fingers ovrr which the film is dragged through the gate. A substitute for the rubber rollers of the projecting machine is provided, and the whole mechanism further is so ass'mbled that the film may be run either forward or backward. A fundamental feature of the machine is that everything which touches the film moves at the same speed as the film itself and therefore there is no friction upon the film, and no wearing or scratching.
Referring to the accompanying illustration, 2 is the shaft of the star wheel and carries the intermittent sprocket J which drives or pulls the film 6, the film 6 also passing over a sprocket 4 on a shaft 5. Rollers p and 10 are in the film gate and the film rests upon them to obtain its proper alinement and registration in the film window.
On the shaft 2 is the gear 12 which through idler
73 on shaft 14 is meshed to gear 15 on shaft 5 carrying sprocket 4, sprockets 4 and ? thus being caused to move in unison.
But the gear 75 is sleeved loosely upon the shaft 5 while sprocket 4 is rigidly upon shaft 5 the connection between 15 and 5 and therefore between 75 and 4 being by means of the spring 20. Concerning threading up the film, the inventor says :
"If the shaft 5 be turned until there is tension in the spring 20 which then tends to coil up, then the film 6 can be placed or threaded on both sprocket wheels j and 4. This action will place the film in tension and there will always be a strong tension. The film will be straight and there will be no jerking or wear or tear of the film. The film when thus under tension will flatten itself on the rollers 9 and 10, thereby aiding in making the views straight. The rollers p and 10 will travel in unison with the film and the sprocket wheels, thereby providing a moving tension which obviates the wear and tear incident to stationary tensions."
The claims read upon the combination of upper and lower feeding sprockets with a spring connection to keep the film taut.
No. 1,057,470. For an Improved Screen Mounting for Projection Purposes. Issued to Clayton S. Wertsner, Philadelphia, Prnna., assignor to Williams, Browne and Earle, Philadelphia, Penna.
The invention pertains to projection screens which are stretched in frames, the object being to provide susp-nsion devices inside the frame to stretch the canvas
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screen and to hold it tight and flat at all times.
The screen cloth is provided with a hem in which are inserted stiff strips of wood. These are connected to the frame at top and one side by strong coil springs. At the bottom and remaining side they are connected to the frame by short turn-buckles or swivel-nuts.