A New Profiling Method of Engraving on Printing Plates by The Needle Type Surface Meter

Aoki Nobutoshi, Tamura Ryozo

doi:10.11413/nig1958.4.35

In the intaglio and photogravure printing, color gradation of printed matters depend on the depth and width of engraving to be filled with ink. With this reason to inspect profile of the engraving is important as for knowing a relation to the quality of printed matter. As inspecting ways of the profile without damage we have known Reprica, Optical Sectioning and others; on the other there is our new way which differs theoretically from the above. A principle and characteristics of the new instrument can be explained briefly in the followings. 1. The instrument has equipped an optical-lever system, as shown Fig. 1, which illustrates a curve line (11) with a plate (8) opened a pinhole, the hole must be that its made spot light has the radius R. R=nr R………Radius of spot light r………Radius of needle head n………Rate of magnifying When magnifying about 100 times, the spot light is larger than usual and illustrates a curve line rather thick, shown as Fig. 3, of which lower side regenerates the profile in conformity with original of engraving (Photo. 2 (C) (D), Photo. 3 (C) (D)). 2. The illustrated profile by this coincides with the original of sectioned real plate (Photo. 2 and 3) 3. This instrument does good measure in a restriction not to lift off a head of the needle from a measuring surface. (Fig. 5, 6 and 7). The illustration may be deforming a certain profile by the nature of this instrument but it is showing both dimentions depth and width in proportion to the object (Fig. 8).

A New Profiling Method of Engraving on Printing Plates by The Needle Type Surface Meter

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