| 摘要 |
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.
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