Printing – Planographic – Rotary machines
Patent
1988-05-20
1990-09-04
Fisher, J. Reed
Printing
Planographic
Rotary machines
101492, B41F 712, B41F 1314
Patent
active
049534610
ABSTRACT:
An improved printing apparatus and method includes plate and blanket cylinders which are rotated at different surface speeds during printing on material. Since the plate and blanket cylinders are rotated at different surface speeds, the area on a blanket cylinder which engages a given portion of the surface on a plate cylinder is changed on each revolution of the blanket cylinder. Therefore, the area of a blanket cylinder which is engaged by the gap in the plate cylinder changes during a printing operation. In addition, the area where an image is applied to the blanket cylinder is moved relative to the surface of the blanket cylinder is tend to minimize build up of ink on the blanket cylinder during printing. The plate and blanket cylinders are driven at different surface speeds by a drive assembly which includes a harmonic drive unit.
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Publication Entitled Power Plant Employs Harmonic Drive Reducer from Pacific Factory, Dec., 1965.
Publication Entitled Use Harmonic Drives as High-Ratio Differentials from Feb., 1968, Power Transmission Design, Industrial Publishing Co.
Gaffney John M.
Gelinas Wilfred R.
Hern Joel C.
Krouse Charles L.
Fisher J. Reed
Harris Graphics Corporation
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