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568 Transactions of S.M.P.E., Vol XII, No. 34, 1928
uniform speed for inspection winding is secured by a constant speed unit of two feed rollers. The feed roller is operated at constant speed. The other roller furnishes the necessary tension to feed the film, so that every foot is wound at the same tension, and there is no bulging or misalignment anywhere. Both rollers are under-cut to avoid scratching of the film. By the release of the tension roller, secured by pressing button 5, the second forward speed is secured for winding at a faster rate than inspection speed.
When the operator detects damage as the film passes through her fingers, she releases the foot pedal control. This pedal applies a brake to each reel. Thus, the film is instantly stopped in a position for splicing.
The operator places the film on registering pins, which are so arranged that splices will be in frame.
Then she closes the lid and presses the button. Within three seconds both lids have opened automaticaly, the film is spliced, and the operator is ready to continue the inspection. The sequence of operation is this.
First, the emulsion is removed by two vertical revolving spiral-faced scrapers mounted on a table which rotates in a horizontal direction beneath the film. Scrapers are held up against the film under spring tension and the scraper mounting is pivoted to allow for varying thicknesses of film. This is self-adjusting. The adjustment of the angle of the spiral-faced scrapers connected with the proper spring tension and revolving table removes all emulsion without harming the film base.
Second, the film is severed. A small round hardened steel knife, which is free to turn on its own axis, with a slight escapement for horizontal movement severs both pieces of the overlapped film.
Third, cement is applied. This is done by means of a concave-faced roller, which is almost completely enclosed in a cement box. The concave face of the roller insures an even amount of cement being applied. For every operation the cement roller is moved before reaching the film to bring fresh cement to the top of the roller. By protective means, cement is prevented from entering the bearings.
Fourth, unit (6) moves forward the overlapping film.
Fifth, a pad moved by a cam is inserted underneath the lap.
Sixth, pressure is applied. Five rollers under strong spring pressure, and mounted to the revolving table, pass underneath the pad pressing the patch firmly and closely together, and insuring uniform pressure all along the splice.
When this operation is complete the splice is finished and the doors open automatically. By the adjustment of a cam the Automatic Film Machine will give any width of splice desired.
It has been proved that the curved or arced splice has a great many advantages over the straight line splice. For this reason the Automatic Film Machine is arranged to make an arc splice. The arc splice has not been previously used in the industry to any great extent because by hand operation it in not easily made. By automatic operation it is as practical as any other, and lias the added advantage of removing undue strain from the splice.