Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
1997-09-24
2001-03-06
Le, N. (Department: 2861)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
Reexamination Certificate
active
06196660
ABSTRACT:
CLAIM FOR PRIORITY
This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. § 119 from an application entitled Resolution Control Apparatus For Ink-Jet Printer earlier filed in the Korean Industrial Property Office on Sep. 24, 1996, and there duly assigned Serial No. 96-31137 by that Office.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a resolution control apparatus and process for controlling an ink-jet printer and, more particularly, to an apparatus able to control printing resolution in the direction that a medium in transported through an ink-jet printer.
2. Discussion of Related Art
Generally, ink-jet printers drive a printing head and carriage in tandem laterally across the width of the medium being printed in a dot-matrix format. Horizontal resolution along the direction of the movement of the printer head across a sheet of paper is limited but controllable. I have found that vertical resolution, that is the resolution of printing on a page in the direction that the page in transported along while passing through an ink-jet printer can not be satisfactorily controlled even when the array of nozzles are attached to the print head in a tilted fashion, because the resolution in the direction of paper transfer is limited by the spacing between the nozzles. Consequently, I have found that contemporary devices for regulating resolution of ink-jet printing have restricted the quality of print obtainable.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a resolution control apparatus for an ink-jet printer that substantially obviates one or more of the problems, limitations and disadvantages of the related art.
It is therefore an object of the present invention to provide an improved apparatus for controlling the resolution of printing by an ink-jet printer.
It is another object to provide a resolution control apparatus for an ink-jet printer to minimize the nozzle interval of a printer head.
It is still another object to provide an apparatus able to attain high-resolution printing.
It is yet another object to provide an apparatus that enables a user to incrementally, selectively control high-resolution low-speed printing or low-resolution high-speed printing.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned through practice of the invention. These objects and other advantages of the invention will be realized through the techniques and structures as are particularly pointed out in the written description and claims hereof, as well as in the appended drawings.
To achieve these and other objects, and in accordance with the purpose of the present invention as embodied and broadly described, there is disclosed a resolution control apparatus for an ink-jet printer having a moving carriage transporting a printer head. Resolution control may be obtained in accordance with the principles of the present invention with an angle controller that incrementally regulates the installation angle of the printer head in stages, thereby controlling vertical resolution. A sensor detects the installation angle of the printer head and generates a print control signal according to the angle sensed.
To control vertical resolution, the angle of the nozzle array on the printing head is tilted with respect the direction of carriage movement. The angle controller may include a lever having a hemispherical protrusion engageable with each of a plurality of holes formed in the carriage and rotatable about a center of rotation of the printer head, and a printing head holder that is rotatable with the lever, for holding the printer head. Preferably, the sensor means is a contact switch positioned at each of the holes, that is activated by the hemispherical protrusion of the lever.
It is to be understood that both the foregoing general description and the following detailed description arc merely exemplary and are intended to provide further explanation of the invention as claimed.
REFERENCES:
patent: 5241325 (1993-08-01), Nguyen
patent: 5488397 (1996-01-01), Nguyen et al.
patent: 5642948 (1997-07-01), Harris et al.
patent: 2 134 045 (1984-08-01), None
patent: 54-158232 (1979-12-01), None
Bushnell , Esq. Robert E.
Le N.
Nguyen Judy
Samsung Electronics Co,. Ltd.
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