Ink supply control device for a stencil printing machine

摘要

In an ink supply control device for a stencil printing machine which controls the supply of printing ink to an ink reservoir formed in a printing drum according to a signal produced from an ink amount detecting device which produces a first signal when the amount of ink stored in the ink reservoir is detected to be greater than a prescribed level, and a second signal when the amount of ink stored in the ink reservoir is detected to be less than the prescribed level, time durations of the first and second signals over a certain time interval or a certain interval of the rotation of the angle of the printing drum are evaluated as a basis for determining true insufficiency of the level of the printing ink in the ink reservoir through an arithmetic computation to the end of preventing erroneous detection by the ink amount detecting device from adversely affecting the control of the supply of printing ink in the ink reservoir. Such erroneous detection of the level of ink is typically caused by disturbances of short durations in the surface of the ink in the ink reservoir.