Geometrical instruments – Gauge – Collocating
Patent
1990-07-23
1991-12-31
Will, Thomas B.
Geometrical instruments
Gauge
Collocating
33614, 33832, B41B 1100
Patent
active
050759809
ABSTRACT:
A method and apparatus for determining the degree of alignment or misalignment of various web offset lithograph printing press components is disclosed. An alignment block is provided having one surface with a modified curved "v" contour, and with a plurality of receptacles for holding register measuring components. The remaining sides of the alignment block are planar and mutually perpendicular. Register measuring components can be attached to extensions placed within the receptacles and those register measuring components are used to measure deviation of web offset press components from a reference point in the press. The alignment block is adaptable to receive dowel pins in the receptacles, which form a corner with the blocks that can be simply and easily placed upon a precisely positioned reference positions on the frame of a color unit of a web offset press. Measurement of misalignment is accomplished by comparing distances from various reference points or press components, through use of a displacement gauge attached to extensions which in turn are attached to the block. The gauge and block combination is moved to measure the distance variations from the reference points to segments of press components. For plate to plate cylinder register, a measuring scale is provided that is flexibly conformable to the plate and mateable with a side of the alignment block. An illuminated magnifier is mountable in one of the block receptacles and positionable to improve the ease of reading the markings on the scale and the register marks on the plate.
REFERENCES:
patent: 2095542 (1937-10-01), Claybourn
patent: 2627118 (1953-02-01), Young
patent: 2787836 (1957-04-01), White
patent: 3367612 (1968-02-01), Usiskin
patent: 4367594 (1983-01-01), Murray
patent: 4383760 (1983-05-01), Deter et al.
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