JPS60245557A - High-speed ink jet printer - Google Patents

Abstract

PURPOSE:To form a simply structured high-speed ink jet printer by keeping intact the relationship between a rotary roller as a common electrode and plural opposed electrodes provided outside the rotary roller and providing ink nozzles away from the rotary roller. CONSTITUTION:The external circumferential surface of a rotary drum 2 is composed of a metal plate 20 and works concurrently as a common electrode. In the meantime, plural linear conductive paths 10 and opposed electrode plates 14 are formed on a substrate 6 in the same mannr as when a printed circuit board is manufactured. On the substrate 6, a rectangular porous glass wall 8 is bonded to form ink nozzles 16, to each of which opposed electrode plates 14 are provided. An electric discharge is generated between the rotary drum 2 as a common electrode and individual opposed electrodes in the ink apertures 16, and an electric shock caused by the discharge sends ink droplets flying over a recording paper 4. Thus the printer is capable of printing at high speed despite its simple structure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high-speed printer using an ink side method.

[Background of the invention]

With the rapid development of information devices, how much information can be sent and recorded in one fixed period of time has become a major issue. Under these circumstances, the inkjet method has attracted attention for its ability to generate negligible noise during recording, to be able to record on plain paper, and above all, to be able to print at high speeds, and has led to various developments. is being carried out.

[Prior art and problems]

For example, Japanese Patent Application Laid-Open No. 114973/1983 describes that [a large number of ink holes capable of holding ink are formed on the surface of an ink carrier by etching process, a large number of electrodes are arranged to face each of the ink holes, and A proposal has been made for a printing device characterized in that the ink held in sequence is suctioned onto the surface of the ink carrier by applying a voltage to the electrode, and the suctioned ink is transferred to transfer paper. ing.

However, considering that the sucked ink is used as a single dot to draw letters or pictures, it is necessary to make the distance between each dot extremely small, and therefore the distance between the ink holes formed must also be extremely small. (50μ~200μ)
You will need to get closer.

However, when the ink holes are brought close together, not only does ink suction occur between the ink holes and the electrodes that face each other, but also ink is sucked from the ink holes that are not facing the opposite electrode to which a voltage is applied, causing characters and characters to be drawn. The picture becomes dirty or unclear.

Therefore, we considered shielding the ink holes with an insulating material, but in that case, providing such a material in the shape of a rotating roller would be extremely difficult in terms of conventional processing techniques.

This problem applies not only to the case where ink is simply absorbed by electrostatic force, but also to the case where, under a similar system, a piece of ink is ejected by electric discharge, forming a dot.

On the other hand, from a processing technology point of view, it is relatively easy to make a plate-like structure that is shielded with an insulating material rather than a rotating roller-like structure.

[Purpose of the invention]

Therefore, the rotating roller is used as a common electrode, and the relationship of providing multiple counter electrodes outside the rotating roller is left as is.
The present invention provides a high-speed inkjet printer with a simple structure in which the ink holes are moved from the rotating roller.

[Structure of the invention]

The structure of the present invention is that, in an inkjet printer, a rotating drum for feeding recording paper and a large number of ink holes separated by a glass wall provided on a substrate are vertically opposed to each other, and a counter electrode plate is provided on the substrate. By providing a linear conductive path connected to the electrode plate, using the rotating drum as a common electrode, and applying a voltage between the opposing electrode and the rotating drum, the ink in the ink hole is attached to the recording paper. A high-speed inkjet printer characterized in that it is configured to

[Embodiments of the invention]

Details will be explained below with reference to the drawings.

FIG. 1 is a perspective view of the printer of the present invention, in which 2 is a rotating drum, 4 is a recording paper, 6 is a substrate, 8 is a glass wall, 10 is a linear conductive path formed on the substrate, and 12 is a glass plate. , 14 is a counter electrode plate, 16 is an ink hole, and 18 is an ink.

The outer peripheral surface of the rotating drum 2 is composed of a metal plate 20, which also serves as a common electrode. On the other hand, a large number of linear conductive paths 10 and a counter electrode plate 14 are formed on the substrate 6, as in the case of making a printed circuit board, and a rectangular glass wall 8 with many holes is formed on the substrate 6. Ink holes 16 each having a counter electrode plate 14 are formed.

A glass plate 12 is further bonded onto the glass wall 8 to form an ink supply hole 24 and an ink supply hole 22.

During printing, ink is always supplied from the ink supply hole 24 to the ink hole 16 and accumulates in the ink hole 16. On the other hand, the signal of the information to be printed is the linear conductive path 1
0, a voltage is applied between the counter electrode plate 14 and the rotating drum 2, and the ink 18 is caused to fly toward the rotating drum 2 and adhere to the recording paper 4.

As the recording paper 4 is fed one after another by the rotation of the rotary drum 2, ink is deposited at a predetermined position in this way, and the point where the ink is deposited becomes one ink dot.
Predetermined characters, pictures, and diagrams are printed out. The ink hole is surrounded by glass, so that it is not affected by the operation of other ink holes as much as possible.

The glass wall 8 may be made into this shape by etching a glass plate, or it may be made by cutting a groove in the metal, pouring the glass in, hardening it, and then etching the metal part, leaving only the glass.

Ink is poured into the ink holes created in this way and a voltage is applied to make the ink adhere to the recording paper 4. However, when the ink is sucked by electrostatic attraction, the recording paper covers the surface of the rotating drum 2. Instead of transferring the ink by the rotating drum 2, as in Japanese Patent Application Laid-Open No. 58-1.14973, the suctioned ink is first attached to the surface of the rotating drum 2'I7), and the attached ink is transferred to the rotating drum separately provided. The image appears to be transferred onto recording paper that is fed by rollers.

Therefore, in the case of FIG. 1(a), electrostatic attraction and C. The shock caused by this causes the ink to fly onto the recording paper 4.

FIG. 1(C) shows a glass plate 12 that covers the glass wall 81C.
In another embodiment, the ink supply hole 22, the ink supply hole 24
A hole is etched into the glass plate so that the height of the glass plate is the same as the height of the glass plate itself. Each hole is made to align with the ink supply hole 22 and the supply hole 24. In this case, the depth of the ink hole is the sum of the height of the glass wall 8 shown in FIG. 1(a) and the height of the glass plate shown in FIG. 1(C).

Normally, when etching a hole in glass, it is said that the maximum depth is the same as the diameter of the hole (when a plate is used to penetrate from both sides).

On the other hand, the pitch between the ink holes is related to the density of the instant dots. If you want to draw sharp letters and pictures at high speed, you need at least 4 dots with a spacing of 1 mm + c. In other words, it is a 250μ pinch. Considering the width of the glass wall 8, the ink hole has a width of about 100 to 150 microns.

Then, the thickness of this glass plate is 100~150mm.
Therefore, if the depth of the glass hole is desired to be 200μ or more, the height of the glass wall 8 must be 100μ or more.

FIG. 1(d) shows another embodiment of the glass wall 8 and the substrate 10, in which the glass wall 8 except for the counter electrode 140 part is
It has a glass bottom 9 with a constant thickness at the bottom. On the other hand, the substrate 6 is provided with a bottom portion 15 of a cylindrical counter electrode portion having a constant thickness and a linear conductive path 10.
is formed on this bottom portion 15 with a constant thickness.

With this configuration, only the circular counter electrode portion 14 faces the common electrode, and is also resistant to shocks caused by discharge.

FIG. 1(e) shows an attempt to make ink fly from the ink hole 16 by electrostatic attraction, and the basic idea is to install a preliminary electrode 26 between the counter electrode 14 and the rotating drum 2. The ink is drawn to the outlet of the ink hole using a preliminary electrode, making it easier for the ink to fly.

A similar effect may be achieved by providing this preliminary electrode on the side surface of the glass wall 11.

FIG. 2 is an overall schematic diagram of a printer according to the present invention,
Components that are the same as in Figure 1 are given the same numbers.

26 is an information reception control section, 28 is an information transmission line, 29 is a conductive rubber, 60 is an ink replenishment section, 62 is an ink collection section, 64
is an ink supply section.

The received information is produced as a dot signal by the information reception control section 26, transmitted to the linear conductive path on the substrate 6 via the information transmission line 28 and the conductive rubber 29, and transmitted to the counter electrode plate 14 of the ink hole 16. Ru.

Further, ink is sent from the ink replenishment section 60, passes through the ink supply hole 22, and is supplied to the ink hole 16. Overflowing ink is received by the ink recovery section 32 and returned to the ink replenishment section 60 by the pump 66. The system is such that the water is recycled and then resupplied.

When supplying this ink, an ink roller may be used for the ink supply section 64 instead of using a semi-cylindrical tube as shown in FIG. The diagram at that time is Figure 3.

Reference numeral 68 denotes an ink supply roller, to which ink is constantly supplied (during recording operation) and rotates as shown by the arrow, so that the ink is cut at an ink cut portion and enters the ink supply hole 22.

By doing so, ink is evenly supplied to each ink hole 16.

FIG. 4 also shows a printer according to the present invention, in which the terminal 42 of the common electrode is arranged separately from the rotating drum, and is arranged between the recording paper 4 and the ink hole 16, and the common electrode 42 is connected to the counter electrode 14. A voltage is applied during this period to cause the ink to fly off and adhere to the recording paper.

The numbers are according to FIGS. 1 to 3.

FIG. 5 shows an example of the common electrode at that time.

Figure 6 shows an example of color printing using the printer of the present invention, where 44 to 62 are rotary drums for feeding the recording paper, and 44, 50, 56, and 62 also serve as common electrodes. . 64, 66, 68, 70 are the substrate and ink holes, 64 is yellow, 66 is magenta, 68 is cyan, 70
In this system, black ink is put into each ink hole, and color printing is possible by sequentially printing this on a single recording paper.

FIG. 7 shows another embodiment of the invention.

This is a device in which the substrate 6 referred to in the present invention is bonded onto a rotating roller 72, a linear conductive path is provided inside the counter electrode plate 14 on the substrate, and an information transmission line is drawn inside the rotating roller. It is connected with.

Reference numeral 74 denotes an ink reservoir. By rotating the rotating roller 72, ink is poured into the ink hole 16. When the rotating roller 72 is rotated, ink is poured into the ink hole 16. When the rotating roller 72 is rotated, a voltage is applied between the common electrode and the opposite electrode on the rotating roller 2. is attached to the recording paper.

In order to increase the printing speed, it is necessary to attach such a substrate at several locations so that dots can be drawn at several locations at the same position during one rotation. Using an inkjet printer, it can be manufactured using conventional technology, has a simple configuration, and can print at high speed, so it will be very effective if put into practical use.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of an electric field type inkjet link according to the present invention. Fig. 2 is an overall schematic perspective view of an electric field type inkjet print according to the present invention, and Fig. 3 is a schematic perspective view of the present invention when an ink roller is used. Fig. 4 is an electric field type inkjet print according to the present invention. FIG. 2 is a schematic explanatory diagram of an embodiment of the present invention. FIG. 5 is an explanatory diagram of the shape of the common electrode used in FIG. 4. FIG. 6 is a schematic illustration of a further embodiment of color printing using the present invention. FIG. 7 is an explanatory perspective view of another embodiment according to the present invention. 2.44.46.48.50.52.54.56.58
...Rotating drum, 4...Recording paper, 6.64.66.68.70...Substrate, 8...
... Glass wall, 10 ... Linear conductive path, 14 ... Counter electrode, 16 ... Ink hole. Patent applicant: Citizen Watch Co., Ltd. Figure 1 (C) Figure 1 (d) 1st flash (e) Figure 4 Figure 5

Claims (2)

[Claims] (1) In an inkjet printer, a rotating drum that feeds recording paper and a number of ink holes separated by a glass wall provided on a substrate are vertically opposed to each other, and a counter electrode plate and the electrode plate are placed on the substrate. A linear conductive path connected to the ink hole θ) is provided, the rotating drum is used as a common electrode, and a voltage is applied between the opposing electrode and the rotating drum to cause the ink to adhere to the recording paper. A high-speed inkjet printer featuring (2) A high-speed inkjet printer according to claim 1, wherein a common electrode is separately provided and arranged between the rotating drum and the ink holes.