Method and apparatus for scanning an ink test strip printed on a sheet, the sheet being positioned on a table traversed in two directions by a scanning head. The table includes guide means including a bar for positioning the sheet in a first dimension and an index mark for positioning the sheet and its...http://www.google.es/patents/US4963028?utm_source=gb-gplus-sharePatente US4963028 - Densitometric sensing device for use in printing presses
Densitometric sensing device for use in printing presses
