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Method and machine for positioning films on base sheets

  • US 4,318,003 A
  • Filed: 04/11/1980
  • Issued: 03/02/1982
  • Est. Priority Date: 02/14/1979
  • Status: Expired due to Term
First Claim
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1. A method for positioning films on base sheets, comprising the steps of:

  • (a) laying out a first film having a picture pattern on a first base sheet into a desired position;

    (b) detecting the positions of edges of the picture pattern in the first film by photoelectric detector means including photoelectric element means which detect the edges of the picture pattern and output signals whose strengths are varied depending on the positions of the photoelectric element means with respect to the edges;

    (c) overlaying a second film having a picture pattern of the same shape as that in the first film on a second base sheet to the first film so that the edges of the picture pattern in the second film may approximately overlap to those in the first film; and

    (d) moving the second film by a drive means so that the edges in the second film may completely be coincident with those in the first film depending on the output signals from the photoelectric element means, thereby positioning the second film into the desired position.

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