JP2003011452A - Double-sided printing structure in inkjet printer - Google Patents

Abstract

(57) [Problem] To provide a compact and simplified structure as a whole, and reduce the load applied to a printer and continuous paper. An ink jet printer for printing on both sides of a continuous paper, wherein the continuous paper is fed along a first paper feed path in a state where the continuous paper is faced up, and is printed by a first print head unit. After the front side 10 is printed, the back side 11 of the continuous paper 1 is folded back from the upstream side to the downstream side with the back side 11 in contact with the turn bar 4, and the back side 11 of the continuous paper 1 is turned up. When the paper is fed along the two paper feed path 30, the back surface 11 is
Is printed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided printing structure in an ink jet printer for printing both sides of continuous paper.

[0002]

2. Description of the Related Art As is well known, an ink jet printer for printing continuous paper is constructed as follows. Continuous paper is fed from a continuous roll of paper wound in a roll (hereinafter referred to as the upstream side) at a specified speed, and after the specified information is printed by the print head, it is wound into a roll or folded. It will be processed (see below,
Downstream). In the information-oriented society in recent years, it has been desired to provide an inkjet printer capable of printing on both sides of continuous paper, and various inkjet printers for that purpose have been provided.

At that time, in the present technology, the head portion of the print head for printing on continuous paper is
The printhead is located above the continuous paper, as it is a prerequisite that it is facing down. Therefore, in order to print both sides of the continuous paper, the two-sided printing cannot be performed unless the front and back surfaces of the continuous paper are reversed by some means.

FIG. 2 is a schematic side view of a conventional double-sided ink jet printer. This printer will be described with reference to FIG. The continuous paper CS fed from the upstream side is fed with its surface facing upward, and the first print head portion P1 first prints on the front surface side. After that, the continuous paper CS
The paper is fed upward by the first turn bar R1.
Then, after the paper is fed rightward by the second turn bar R2, it is fed downward by the third turn bar R3,
Further, the paper is fed leftward by the fourth turn bar R4. By doing so, the back surface of the continuous paper CS faces upward between the fourth turn bar R4 and the fifth turn bar R5, and the second print head portion P2 arranged between them is placed.
By this, the back side is printed. Then, after the continuous paper CS is fed downward by the fifth turn bar R5,
The sixth turn bar R6 feeds the paper to the downstream side.

[0005]

The above-mentioned conventional ink jet printer has the following problems. First of all, the inkjet printer
It is a large-scale device as a whole. The reason is that, as described above, the continuous paper CS has to be fed in the upward and downward directions, so that the predetermined height H is required. Therefore, a vast space is required to install this printer. Secondly, at least two drying devices for drying the continuous paper CS are required. First, the first drying device K1 is installed on the upstream side of the first turn bar R1. Since the surface of the continuous paper CS printed by the first print head portion P1 contacts the first turn bar R1 and is fed, if the surface is not sufficiently dried by the drying device K1 before contact, the contact This is because good print quality cannot be maintained. next,
Continuous paper C printed by the second print head portion P2
A second drying device K2 for drying the back surface of S must be installed. Third, as described above, many turn bars R1 to R6 are required, which is economically disadvantageous. Fourth, the continuous paper CS has many turn bars R1 to R1.
Since the paper is fed in the state of being in contact with 6, the load applied to the continuous paper CS is large and the paper is easily broken.

As described above, since many turn bars and drying devices are required, the structure is very complicated, and much time and labor are required for assembling and repairing the structure. or,
Since this is a large-scale device as a whole, a large installation space is required to install this device. Furthermore, since the continuous paper has to be passed through at least two drying devices, a large amount of water contained in the continuous paper evaporates, the expansion and contraction of the continuous paper increases, and the load applied to the printer and the continuous paper increases.

Therefore, the present invention downsizes the ink jet printer for printing both sides of continuous paper,
The present invention also provides a double-sided printing structure in an inkjet printer that has a simplified structure and further reduces the load on the printer and continuous paper.

[0008]

According to the present invention, there is provided an ink jet printer for printing both sides of continuous paper, comprising a first print head portion for printing the surface of the continuous paper,
The continuous paper has a second print head portion for printing the back surface and one turn bar for reversing the front and back surfaces of the continuous paper, and the first paper feed path with the front surface of the continuous paper facing upward. After the paper is fed along and the front surface is printed by the first print head unit, the back surface of the continuous paper is folded back from above while being in contact with the turn bar, and the back surface of the continuous paper is fed. The sheet is fed along the second sheet feeding path in a state in which the sheet faces upward, so that the back surface is printed by the second print head unit.

In a preferred embodiment, the turn bar is arranged so that the angle of the second paper feed path with respect to the first paper feed path is a right angle. In a further preferred embodiment, the continuous paper is printed by the second print head unit and then dried by a drying device.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a plan view of an embodiment of the present invention viewed from above. In FIG. 1, 1 is continuous paper, 2
Is a first print head unit, 3 is a second print head unit,
And 4 is a turn bar. In an inkjet printer capable of color printing, first and second
Each of the print head units 2 and 3 is composed of four print heads, and is composed of four color print heads of yellow (Y), magenta (M), cyan (C), and black (B). . Since the print head units 2 and 3 must have their head surfaces facing downward, they are located above the continuous paper 1 and print predetermined information based on the set print data. ing. Further, the shape of the turn bar 4 is a cylindrical shape, and its length is such that at least the entire width of the continuous paper 1 can come into contact with it, as described later.

Then, in the ink jet printer of the present invention, the continuous paper 1 is fed at a predetermined speed from a roll-shaped continuous paper (hereinafter referred to as the upstream side) wound into a roll, and the first and second prints are made. After the front and back surfaces 10 and 11 of the continuous paper 1 are printed by the heads 2 and 3, the roll paper is wound or folded and processed (hereinafter referred to as the downstream side).

First, the continuous paper 1 is fed from the upstream side along the first paper feed path 20 with the surface 10 thereof facing upward. And on the first paper feed path 20,
Predetermined information HD is printed on the surface 10 of the continuous paper 1 by the first print head unit 2 located above the continuous paper 1.

On the first paper feed path 20,
A turn bar 4 is installed on the downstream side of the first print head unit 2. The continuous paper 1 having the front surface 10 printed by the first print head unit 2 is folded back from the upstream side to the downstream side in a state where the back surface 11 is in contact with the turn bar 4, so that the front and back surfaces 10 and 11 are inverted. , Back side 11
The paper is fed along the second paper feed path 30 in a state of facing upward.

On the second paper feed path 30,
Predetermined information UD is printed on the back surface 11 of the continuous paper 1 by the second print head unit 3 located above the continuous paper 1. In this embodiment, the turn bar 4 has the second paper feed path 30 with respect to the first paper feed path 20.
Are arranged so that the angle θ is right. That is,
The angle α with respect to the first paper feed path 20 is 45 °, and the angle β with respect to the second paper feed path 30 is 125 °. The arrangement angle of the turn bar 4 is not limited to the above, but is appropriately designed depending on the installation space of the printer, and the angle θ of the second paper feed path 30 with respect to the first paper feed path 20 is arbitrary. Can be set to.

The continuous paper 1 printed by the second print head unit 3 is configured to be fed to the downstream side along the second paper feed path 30 and then dried by the drying device 5. By doing so, the front and back surfaces 1 of the continuous paper 1 printed by the first and second print head units 2 and 3
Both 0 and 11 can be dried simultaneously by one drying device 5.
The drying device 5 has a box shape larger than the continuous paper 1, and has a heat source for drying the continuous paper 1 therein. Then, the continuous paper 1 is dried by passing through the insertion holes provided in each of the opposite side walls of the drying device 5.

[0017]

According to the double-sided printing structure of the ink jet printer according to the present invention, the front and back surfaces of the continuous paper can be reversed by one turn bar to print on both sides of the continuous paper. Overall, it is compact and has a simple structure. Therefore, even when installing this inkjet printer, a large space is not required, and much time and labor are not required for assembling or repairing the printer. Further, since the continuous paper can be reversed by one turn bar, the load applied to the continuous paper is small and the structure is not easily broken. Furthermore, after printing the surface of the continuous paper, the continuous paper can be inverted without touching the turn bar, so that it is not necessary to dry the continuous paper before contacting the turn bar, and the final stage is dried. It is sufficient to use only one drying device, and it is economically advantageous. Further, since the continuous paper does not expand and contract, the load applied to the printer and the continuous paper is reduced. The plane shape of the printer can be freely set according to the installation angle of the turn bar, and the printer can be designed according to the installation space.

[Brief description of drawings]

FIG. 1 shows a plan view of an embodiment of the present invention.

FIG. 2 shows a side view of a conventional inkjet printer for double-sided printing.

[Explanation of symbols]

1 continuous paper 2 First print head part 3 Second print head part 4 turn bar 5 dryer 10 Surface of continuous paper 11 Back side of continuous paper 20 First paper feed path 30 Second paper feed path θ Angle of the second paper feed path with respect to the first paper feed path

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2C055 KK00 KK02 KK10                 2C056 EA23 HA27 HA44                 2C060 AA09 BC49                 2C062 RA06                 3F104 AA01 GA01 GA11

Claims (3)

[Claims] 1. An inkjet printer for printing both sides of a continuous paper, the first printer printing the front surface of the continuous paper.
A print head section, a second print head section for printing the back side of continuous paper, and 1 for inverting the front and back sides of the continuous paper
A turn bar of a book, and the paper is fed along the first paper feed path with the surface of the continuous paper facing upward.
After the front surface is printed by the print head unit, the back surface of the continuous paper is folded back and fed from the upstream side to the downstream side in a state of being in contact with the turn bar, and when the back surface of the continuous paper faces upward, A double-sided printing structure in an inkjet printer, wherein the back side is printed by the second print head unit by feeding the paper along the two paper feed paths. 2. The double-sided printing structure for an ink jet printer according to claim 1, wherein the turn bar is arranged so that an angle of the second paper feed path with respect to the first paper feed path is a right angle. . 3. The double-sided printing structure for an ink jet printer according to claim 1, wherein the continuous paper is printed by the second print head unit and then dried by a drying device.