Film slitter, film and film slitting method

摘要

A multi-head film slitter slits wide film having a photosensitive emulsion layer oriented upwards to produce motion picture film. A lower rotary blade has a lower cutting edge. An upper rotary blade has an upper cutting edge, for shearing the wide film with the lower cutting edge. The upper and lower cutting edges are overlapped partially, and contact one another in a position downstream in a running direction of the wide film. A clearance is provided between the upper and lower cutting edges in a position upstream in the running direction. Also, a lower blade shaft rotates the lower blade. An upper blade shaft is disposed higher than the lower blade shaft, for rotating the upper blade. The clearance is provided by inclining the upper blade shaft on a plane on which the upper blade shaft lies and which is parallel with the wide film.