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. 30, 1985
Filed:
Apr. 04, 1983
Raymond F Melissa, Santa Ana, CA (US);
Lorne H Grummett, Costa Mesa, CA (US);
John C Chamberlain, Irvine, CA (US);
Trilog, Inc., Irvine, CA (US);
Abstract
A dot matrix line printer/plotter apparatus for producing hard copy printout of digitally represented data. The apparatus utilizes one or more hammer banks, each mounted so as to shuttle across a paper web fed therepast. Each hammer bank carries a plurality of hammer assemblies, each of which can be individually actuated to print a dot as it sweeps across the paper. Each hammer bank is mounted on a circuit board which carries electronic circuitry to actuate the hammer assemblies thereon. The circuit boards are supported by leaf springs and driven by a stepper motor which shuttles the boards along linear paths to sweep each hammer assembly across a certain portion of the paper width. Each hammer assembly includes a hammer supported in a guide tube for linear movement between a retracted position and an extended position engaging the paper. A permanent magnet is provided to normally latch the hammer in its retracted position. Each hammer assembly further includes a coil energizable to null the action of the permanent magnet as to that hammer assembly and to thus permit a spring to propel the hammer to said extended position.