The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 21, 1992
Filed:
Nov. 23, 1988
Fumio Osawa, Ibaraki, JP;
Hideki Mori, Ibaraki, JP;
Komori Corporation, Tokyo, JP;
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.