Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
1998-12-08
2001-01-16
Nguyen, Thinh (Department: 2861)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
C347S005000, C347S014000, C347S037000
Reexamination Certificate
active
06174044
ABSTRACT:
CLAIM OF PRIORITY
This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. §119 from my application entitled The Increase Mechanism on Printing Speed of InkJet Printer and Increase Method Thereof filed with the Korean Industrial Property Office on Dec. 8, 1997 and there duly assigned Ser. No. 97-66682 by that Office.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an inkjet printer, more particularly, to an inkjet printer improving a printing speed with an ink cartridge having an increased number of nozzles and a method therefor.
2. Discussion of Related Art
Generally, an inkjet printer is a device of receiving electrical signals and outputting ink to print the data on paper, and is equipped with one or two ink heads.
In conjunction with
FIG. 1
, the conventional inkjet printer
10
can be described as follows. The mounting frame
11
is formed vertically, and side walls
12
and
12
′ are formed on the right and left of frame
11
, respectively. A guide rod
14
connects side wall
12
with side wall
12
′ and a part
13
, for preventing the separation of a carriage
41
during reciprocation, is on the upper side of frame
11
. In addition, carriage
41
is installed to be able to reciprocally move along guide rod
14
and part
13
, and a timing belt
42
is installed to reciprocally drive carriage
41
along guide rod
14
. A feed roller
31
is installed to feed and discharge the paper in the lower part of the frame
11
, and a motor
43
is installed to drive timing belt
42
in the back side of frame
11
.
The feed roller
31
moves paper in incremental steps in the LF direction (the discharging, or line feeding, direction of the paper) and prints one line per step. When the resolution is 300 dpi, the number of valid pixels in one line is 2550, and 2550 pieces of binary data are printed. Here, as
1
dot is printed at a time, one line is printed when the carriage moves 2550 steps in the CR (carriage return) direction.
The time required to print one line of information is determined by the number of steps necessary for moving the carriage
41
in the CR direction and for moving the paper in the LF direction according to the print resolution, and the printing speed of the ink head. That is, in order to print fast, the print resolution has to be dropped. And in order to raise the resolution and to get a resolution of high quality, more printing time will be required.
Accordingly, it is known that the time for printing one line is as follows:
(1) the number of the carriage moving steps into the CR direction x the time required in order to move the carriage one step (2550 steps on the criterion of 300 dpi);
(2) (2550 times on the criterion of 300 dpi)×time required in order for the nozzle to jet ink; and
(3) the time required in order to print one line=(1) +(2).
As shown in the above, in order to print one line, a lot of time is required however fast the printer moves because of the number of times required for repeating each operation. I have determined a method for reducing the printing time, as follows:
(1) By reducing the number of the steps required for the carriage to move in the CR direction in order to print one line; and
(2) By reducing the number of times the ink head needs to jet ink by increasing the number of nozzles in the ink head.
That is, there are two methods for reducing the printing time as explained in the above. But the existing device and method cannot perform (1) and (2). Explained more in detail, the printing speed is slow in case of the conventional device and method therefor, and my method for reducing the printing time by increasing the printing speed will been described in detail below.
SUMMARY OF THE INVENTION
Accordingly, in order to overcome such drawbacks in the conventional art, it is therefore an object of the present invention to provide a high speed printing device of increasing the printing speed by shortening a driving distance of a carriage.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, there is provided a high speed printer comprising: an ink cartridge having nozzles with a narrower distance than a width of a printing area; a carriage capable of loading said ink cartridge; and a carriage controller controlling the reciprocation of said carriage, whereby the carriage is reciprocated according to the distance between the nozzles and the print resolution, so that printing is carried out.
REFERENCES:
patent: 4540996 (1985-09-01), Saito
patent: 5734393 (1998-03-01), Eriksen
patent: 5774144 (1999-05-01), Eriksen
patent: 5905517 (1999-05-01), Silverbrook
Bushnell , Esq. Robert E.
Nguyen Thinh
Samsung Electronics Co,. Ltd.
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