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:
Mar. 17, 1987
Filed:
Jan. 17, 1986
Leonard G Rich, West Hartford, CT (US);
Dale G Blake, Tolland, CT (US);
Metromedia, Inc., , DE (US);
Abstract
A hydraulic circuit and related method are provided for dynamically varying the pressure of ink supplied to an ink jet printer head to obtain consistent volume ejected ink drops despite differences in the time elapsing between successive drops. A dot rate command signal related to an actuation frequency and corresponding to the pressure of ink at the head necessary for producing an ejected drop having a desired volume is compared with the ink pressure at the head to produce a pressure control signal for varying the pressure of the ink in a variable volume fluid chamber to deliver ink to the head at the desired pressure. The pressure control signal is one chosen by experiment as that required to produce the desired ink drop volume for the specific ink supply and ink jet printer head employed.