Printing – Inkers – Fountains
Patent
1988-11-23
1992-04-21
Wiecking, David B.
Printing
Inkers
Fountains
101DIG47, B41F 3102
Patent
active
051057395
ABSTRACT:
An apparatus for controlling ink supply amounts of individual zones by independently controlling gaps between an ink fountain roller and blades, the zones being obtained by dividing an axial length of a printing plate, includes a stepping motor arranged to correspond to each blade, a pulse generator directly coupled to the stepping motor, a waveshaper consisting of two AND gates and arranged in correspondence with the pulse generator, and a control unit including a CPU, an interface, and a memory. The stepping motor increases or decreases the gap between each blade and the ink fountain roller. The pulse generator generates two-phase pulse-like signals upon rotation of the stepping motor. The waveshaper waveshapes the pulse-like signals into two-phase pulse signals in accordance with hysteresis characteristics. The control unit supplies drive pulses to the stepping motor and detects that a control error of the stepping motor occurs when the pulse signals are not normally generated by the waveshaper in response to the drive pulses.
REFERENCES:
patent: 4329923 (1982-05-01), Iida
patent: 4591774 (1986-05-01), Ferris
patent: 4761598 (1988-08-01), Lovrenich
Mori Hideki
Osawa Fumio
Kelley Steven S.
Komori Corporation
VanOphem Remy J.
Wiecking David B.
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