Patent ID: 7400378
Filing Date: 2008-07-15
Classification: G03B

Abstract:
1. A method of feeding a film negative and a raw stock film onto a dual sprocket of a film printer which feeds the negative and the raw stock to an aperture for exposing the negative and the raw stock to a light source as the dual sprocket rotates to move the negative and the raw stock past the aperture, both the negative and the raw stock having a left side with a left set of perforations, a right side with a right set of perforations, an emulsion side and a cell side, the negative and the raw stock being fed so that the emulsion sides are facing each other, the dual sprocket having a full fitting sprocket and a shrinkage sprocket, comprising the steps of: feeding the negative and the raw stack into a chamber; applying a first pressure in the chamber to cell side of the negative; applying a second pressure in the chamber to the cell side of the stock; and feeding the negative and the raw stock from the chamber to the dual sprocket; wherein the negative and the stock are deflected in the same direction in the chamber; and wherein the first and the second pressure cause both the left and the right set of perforations of the negative and the raw stock to contact teeth of the dual sprocket under tension.