Method and apparatus for measuring pattern area percentage for engraving films

摘要

Apparatus for measuring pattern area percentage of engraving film with a transparent member for placing the film thereon, an optical device having a light source and light receiving unit, a moving device for relatively moving the transparent member and the optical device, and a control device which has a memory for storing the data concerning the light transmission quantities given by the optical device and a calculating device for calculating pattern area percentage corresponding to each column defined on the printing plate of a printing machine used. The number and width of columns of the printing plate varies depending on the number and spacings of ink supply keys. The control device controls the moving device which moves the placing member in the direction of each column. The optical device has a slit which width can be changed in accordance with the number and widths of ink supply keys mounted on a primary machine used.