Method and apparatus for registration of a seal

Details Method and apparatus for registration of a seal Method and apparatus for registration of a seal

B - Operations, Transporting

31

B

B31B 49/00 (2006.01) B26D 5/20 (2006.01) B26D 5/22 (2006.01) B26D 5/34 (2006.01) B29C 65/00 (2006.01) B29C 65/18 (2006.01) B31B 1/74 (2006.01) B31B 19/74 (2006.01) B31B 23/00 (2006.01)

Patent

CA 2129381

A plastic bag making machine including a cylindrical drum with a variable diameter is disclosed. A plurality of seal bars, substantially parallel to the drum's rotational axis, define the circumference: of the drum. Bags are made from a film that includes registration marks detected by a detector disposed near the film's path. A detector detects the revolution of the drum and an encoder provides signals indicative of the position of the film. A controller determines the distance between the registration marks using the output of an encoder as a position signal and adjusts the diameter of the drum in response to the determined distance. The controller also determines the position of the seal bars relative to the registration marks and adjusts the diameter of the drum in response to the relative position.

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