JPH03146357A - Printer - Google Patents

Abstract

PURPOSE:To miniaturize a printer main body and make it possible to print simultaneously the front and back of a printing paper with a comparatively simple mechanism by a method wherein on a carriage which is constituted movable in the width direction of a printing paper, ink jet heads of at least 4 colors are arranged in two rows. CONSTITUTION:Carriages 17 are detachably loaded with ink jet heads 22 for at least 4 colors 22a, 22b... e.g. yellow, magenta, cyan and black, in two rows. At the time of printing, first, 1 line of printing is performed by ink jet heads 22c, 22d on a second row, which are located on a paper feeding roller 12 side, and then, paper feeding for one line is performed by rotating the paper feeding roller 12, etc., and from now and on, printing is performed by all the ink jet heads 22a, 22b..., and these motions are repeated. When printing is performed on the front and back of a printing paper 15, the carriages 17 are simultaneously or alternately moved, and at the same time, from an jetting part 19 of the ink jet head 22, the ink is jetted to the printing surface of the printing paper 15 through a passing through hole 31 to perform the printing.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a printer that feeds printing paper in a substantially horizontal direction and mainly uses an inkjet head.

(b) Conventional technology For example, in color inkjet printers that use four colors of ink: yellow, magenta, cyan, and black,
As shown in Publication No. 4-36458, since the inkjet heads of the four colors mentioned above are arranged in a horizontal row, the movement width of the carriage relative to the printing width is considerably wide, so it is difficult to replace the inkjet heads shown in the above publication. If an attempt is made to use an inkjet head in which a relatively wide head and an ink cartridge are integrated, there is a problem in that the movement width of the carriage becomes even larger, resulting in an increase in the size of the printer body.

On the other hand, if the ink heads are arranged radially around the drum, as shown in Japanese Utility Model Application Publication No. 63-113648, the above-mentioned printing width problem can be solved, but in this case, the carriage becomes larger. There's a problem.

(c) Problems to be Solved by the Invention The present invention aims to reduce the size of the main body of the printer and to simultaneously print on both sides of printing paper using a relatively simple mechanism.

(d) Means for Solving the Problems The present invention provides a paper feed roller and a paper ejection roller that are disposed at a predetermined interval on substantially the same plane, and these rollers move the printing paper in a substantially horizontal direction. In addition to feeding the paper, it is equipped with a carriage that is located between the rollers and can move freely in the width direction of the printing paper.
In this carriage, the inkjet heads are mounted in two rows of at least four colors.

Further, in an apparatus in which a paper feed roller and a paper ejection roller are disposed at a predetermined interval on substantially the same plane, and the printing paper is fed in a substantially horizontal direction by these rollers, the printing paper is Carriages are mounted above and below the paper and are movable in the width direction of the printing paper, and inkjet heads are placed on each of these carriages, and inkjet heads of at least four colors are placed in two rows on each carriage. It is made up of

(E) Function During printing, the paper feed roller and discharge roller feed the printing paper approximately horizontally, and at the same time, the carriage moves back and forth in the width direction of the printing paper, and at the same time directs the inkjet head toward the printing surface of the printing paper. This is done by spraying ink.

(f) Embodiment An embodiment of the present invention will first be explained based on FIGS. 1 and 2. (1) is the printer main body, and the lower case (3) has an opening (2) on the top surface (2). In the section, paper feed tray (4)
, paper guide (5), platen (6), paper ejection guide (7)
are arranged in sequence, and an automatic paper feed roller shaft (8) is installed on the paper guide (5) side of the paper feed tray (4).
In addition, a pair of upper and lower paper feeding roller shafts (9) are provided on the paper guide (5) side and the paper ejection tray (7) side of the platen (6), respectively.
(9), Attach the paper ejection port/-ra shaft (10) (10),
Each of these roller shafts has a plurality of automatic paper feed rollers (11).
(11011), paper feed roller (12) (12)...,
Paper ejection rollers (13) (13)... are installed.

(14) is an upper case attached to the opening (2) of the lower case (3), and the paper feed port (14) is located opposite to the above paper feed tray (4) and into which the printing paper (15) is pushed. 16) is open.

(17) is the above roller (12) (12)...(13)
(13)... A carriage mounted on a shaft (18) at a suitable position above the platen (6) so as to be slidable in the width direction of the printing paper (15), for example as shown in FIG. 3. An inkjet head (22), which is an integrated head (20) equipped with an ink ejection part (19) and an ink tank (21), is used for at least four colors (22a) (for example, yellow, magenta, cyan, and black). 22b)...They are removably placed in two rows. The inkjet head (22a) (22b)... has its ejection part (19) (
19)... is mounted on the adjacent direction side.

(23) is a carriage that moves the carriage (17).
It is driven by a noji motor via a pair of boos 9 (24) (24) and a driving member (25) such as a wire or a belt.

(26) is a paper feed motor which rotationally drives the paper feed roller shaft (9) through gears (27) and (27), and a belt (not shown) attached to this roller shaft and the paper ejection roller shaft (10). This belt interlocks the roller shafts (9) and (10).

(28) is the automatic paper feed motor, and gears (29) (29)
The automatic paper feeding roller shaft (8) is rotationally driven through the automatic paper feeding roller shaft (8).

Therefore, when printing, first the paper feed roller (12) (1
2) The second row of inkjet heads (22c) (22d) located on the sides print one line, and then the paper feed rollers (12) (12), etc. are rotated to print one line of paper. After that, all inkjet heads (22a) (2
Printing is performed in step 2b), and this process is repeated.

Note that the inkjet heads (22a) (22b) in the first row located on the side of the paper ejection rollers (13) (13), and the inkjet heads (22c) (22c) (22b) in the second row and the eleventh row
If the spacing between the ejection parts (19) (19) in d) does not match the line pitch for printing, and the line pitch is smaller, first print the inkjet head (22c) in the second column.
(22d) prints the first line, then the paper is fed by the line pitch, and then the inkjet head (22c) of the second column (
22d) prints the second line, and this time the first line printed above is printed on the inkjet head (22a) (2
The paper is fed until it reaches the printing position according to step 2b), and printing is then performed using this first row of inkjet heads. Then, the paper is fed again until the inkjet heads (22c) (22d) of the second column are located at the printing position of the third line, and after printing with these heads, the paper is fed again by the line pitch, and the paper is fed again by the line pitch. The fourth line is printed using the heads (22c) (22d) in the column, and this process is repeated thereafter.

On the other hand, if the row pitch is larger, first the first row is printed using the inkjet heads (22c) (22d) in the second row, and then the spacing between the rows of the ejection parts (19) (19), etc. After feeding the paper, the heads (22a) (22
In step b), print the first line, then feed the paper until the head (22c) (22d) of the second column is located at the printing position of the second line, and then use this head to print the second line. is printed,
Repeat this from now on.

Next, refer to Figures 4 and 5, and the common parts are shown in Figures 1 and 2 above.
To explain using the same reference numerals as in the figure, (30) (30) are in the paper feed path between the paper feed rollers (12) (12)... and the paper ejection rollers (13) (13)... A pair of upper and lower paper guides are positioned and mounted, and are positioned opposite to each other with a gap that allows the printing paper (15) to pass through.

(17) (17) is a pair of carriages mounted above and below the paper guides (30) (30), which slide in the width direction of the printing paper (15) on shafts (18) (18), respectively. In addition to being freely attached, an inkjet head (22) as described above is also removably mounted thereon.

(31) (31) is the ejection part (19) of the inkjet head (22) (22) of the paper guide (30) (30)
(19) is a passage hole that is open and located opposite to.

When printing on the front and back sides of the printing paper (15) at the same time, the paper feed rollers (12) (12), etc. are rotated to print at a predetermined position between the paper guides (30) (30). Paper (1
5), the carriages (17) (17) are moved simultaneously or alternately, and the inkjet head (22) is moved simultaneously or alternately.
)(22) From the jetting part (19)(19), the passage hole (3
1) Ink is ejected onto the printing surface of the printing paper (15) through (31).

On the other hand, in FIGS. 6 and 7, at least four color inkjet heads are mounted on the upper and lower carriages (17) (17) shown in FIGS. 4 and 5 above, as shown in FIGS. 1 and 2, respectively. (22a), (22b), etc. are mounted in a removable manner, and the bottoms of these grooves allow color printing to be performed simultaneously on the front and back sides of the printing paper (15).

(G) Effects of the Invention By arranging inkjet heads of at least four colors in two rows on a carriage with a groove bottom that is movable in the width direction of the printing paper, for example, the width of the printing paper of the carriage Compared to the case where inkjet heads of four colors are installed side by side in the direction, the width of the printer main body can be significantly reduced.

In addition, by placing each inkjet head on a carriage that is mounted above and below the printing paper and can move freely in the width direction of the printing paper, there is no need to use a complicated mechanism such as a reversing feeding mechanism for the printing paper. , it is possible to simultaneously print on the front and back sides of printing paper, and by mounting inkjet heads of at least four colors in two rows on each of the above carriages,
It is possible to perform color printing on both sides of printing paper at the same time using a relatively simple method.

[Brief explanation of the drawing]

FIG. 1 is a side longitudinal sectional view of the present invention, FIG. 2 is a plan view, FIG. 3 is a perspective view of an inkjet head, FIG. 4 is a side longitudinal sectional view of the invention, and FIG. plan view of
FIG. 6 is a side longitudinal sectional view showing another embodiment of the present invention, and FIG.
The figure is a plan view of FIG. 6. (12) (12)... Paper feed roller, (13) (
13)... Paper discharge roller, (15)... Printing paper, (17)... Carriage, (22)... Inkjet head.

Claims (3)

[Claims] (1) A paper feed roller and a paper ejection roller are arranged at a predetermined interval on substantially the same plane, and these rollers feed the printing paper in a substantially horizontal direction, and the paper is positioned between the rollers. Equipped with a carriage that can move freely in the width direction of the printing paper,
A printer in which inkjet heads are mounted on this carriage, characterized in that the inkjet heads are mounted in two rows of at least four colors. (2) In an apparatus in which a paper feed roller and a paper ejection roller are arranged at a predetermined interval on substantially the same plane, and these rollers feed printing paper in a substantially horizontal direction, there is a gap between the rollers and A printer characterized in that carriages are mounted above and below the printing paper and are movable in the width direction of the printing paper, and inkjet heads are mounted on each of these carriages. (3) The printer according to claim 2, wherein inkjet heads of at least four colors are mounted in two rows on the carriage.