JPH0453753A - Printing head for ink jet printer - Google Patents

Abstract

PURPOSE:To prevent a washing liquid from being deposited on the top face of a casing by opening a compressed air introducing hole on the top face of the casing, an ink flying hole on the side face thereof, and a washing liquid discharge hole on the bottom face thereof, and providing a washing liquid supply part for ejecting the washing liquid at a position above an orifice, a charged electrode and a deflecting electrode, respectively. CONSTITUTION:A casing 14 formed into a rectangular parallelopiped and made of stainless steel has a compressed air introducing hole 15 opened on its top face, an ink flying hole 16 opened on its side face, and a washing liquid discharge hole 17 opened on its bottom face. Further, the top face of the casing 14 is formed into a pyramidal shape so as to improve the flow of compressed air. Then, the orifice 10b of an ink reservoir 10, a charged electrode 11, a deflecting electrode 12, and a garter 13 are linearly disposed in the casing. In addition, each washing liquid supply part 18 for ejecting the washing liquid is provided at a position above the orifice 10b, the charged electrode 11, the deflecting electrode 12, and the garter 13, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a print head for an inkjet printer.

[Conventional technology]

The print head of conventional inkjet printers has a second
As shown in the figure, an ink supply pipe 20a is provided inside the housing 24.
An ink storage section 20 that is supplied with ink and discharges ink particles from an orifice 20b, a charging electrode 21 that charges the ink particles, and a deflection electrode 22 that causes the charged ink particles to fly in a predetermined direction are arranged in a straight line. . The ink particles whose flying direction has been changed are sent to the ink flying hole 2 on the side of the housing.
Ink particles that have passed through the ink droplets 6, reached the image forming object, and were unable to change their flight direction are collected or discarded by a knife-shaped gutter 23. Note that the gutter 23 may be provided outside the housing.

Further, 27 in FIG. 2 is a cleaning section. This includes the orifice 20b, the charging electrode 21. Since each part of the deflection electrode 22, the gutter 23, etc. may not be able to perform its intended function due to drying of attached ink, etc., the cleaning liquid supplied from the cleaning liquid supply pipe 30 is jetted to each part, and the compressed air supply pipe 29 This is for cleaning by drying with compressed air supplied by the machine. Note that the cleaning section 27 is
Each part is cleaned while moving on the moving rail 28, and the cleaning liquid is discharged from the cleaning liquid discharge hole 25 provided on the bottom of the housing.

[Problem to be solved by the invention]

However, in the print head of a conventional inkjet printer, the compressed air blowing part of the cleaning part is located below the top surface of the casing, so the ink storage part.

When the cleaning liquid 31 that hits the charging electrode and the deflection electrode splashes and adheres to the top surface 32 of the housing, it cannot be removed.

When using an inkjet printer, the cleaning liquid may fall onto the charging electrode or deflection electrode, causing malfunctions such as short circuits.

[Means to solve the problem]

The present invention has been made in view of the above-mentioned problems, and includes an orifice of an ink storage section, a charging electrode, and a deflection electrode that are disposed inside a housing, a compressed air introduction hole on the top surface of the housing, and an ink supply hole on the side surface of the housing. In addition to opening the flight hole and the cleaning liquid discharge hole on the bottom,
The above-mentioned problem has been solved by a print head of an inkjet printer that is provided with a cleaning liquid supply section that sprays cleaning liquid above the orifice, the charging electrode, and the deflection electrode, respectively.

[Function] In the print head of the inkjet printer of the present invention, since the compressed air introduction hole is located on the top surface of the housing above the cleaning liquid supply section, by introducing compressed air after jetting out the cleaning liquid, the cleaning liquid can be applied to the top surface of the housing. It never sticks.

〔Example〕

Hereinafter, the print head 19 of the inkjet printer of the present invention will be explained using FIG.

A compressed air introduction hole 15 was formed in the top surface of a rectangular parallelepiped casing 14 made of stainless steel, an ink flying hole 16 was formed in the side surface, and a cleaning liquid discharge hole 17 was formed in the bottom surface. Note that the shape of the top surface of the housing 14 is sickle-shaped as shown in FIG. 1 for better flow of compressed air.

Next, the orifice 10b of the ink reservoir 10, the charging electrode 11, the deflection electrode 12, and the garter 13 are arranged in a straight line inside the casing.In this embodiment, the garter 13 is provided inside the casing 14, but it is arranged outside the casing. It may be provided.

In addition, the orifice IOb, the charging electrode 11, and the deflection electrode 12
A cleaning liquid supply section 18 for spouting cleaning liquid is provided above the gutter 13. The cleaning liquid supply section is pipe-shaped and passes through the side surface of the housing at the rear in the figure, and is connected to a cleaning liquid tank (not shown).

The ink storage part of the print head 19 of the inkjet printer completed in this way] The ink supply pipe 10 is connected to O.
Fill with pressurized ink, apply ultrasonic vibration,
Ink particles were ejected from the orifice 10b, the ink particles were charged by the charging electrode 11, and the charged ink particles were caused to fly in a predetermined direction by the deflection electrode 12.

According to the print head of the inkjet printer according to this embodiment, the cleaning liquid was ejected from the cleaning liquid supply section 1B to clean the orifice Job, the charging electrode 11, the deflection electrode 12, and the gutter 13. In addition, if the ink is water-based, use water, alcohol, or detergent for the cleaning solution; if the ink is oil-based, use water, alcohol, or detergent.
Use a solvent.

Thereafter, the cleaning liquid was removed by introducing compressed air at 1.5 atmospheres through the compressed air introduction hole 15.

When the inside of the housing was observed immediately after cleaning, no cleaning liquid was found on the top of the housing.

〔Effect of the invention〕

According to the present invention, since the cleaning liquid does not adhere to the top surface of the housing, the cleaning liquid does not fall onto the charging electrode or the deflection electrode.
Failures such as short circuits no longer occur.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the print head of an ink jet printer of the present invention, and FIG. 2 is an explanatory diagram showing a print head of a conventional ink jet printer. ]O... Ink reservoir 10a... Ink supply pipe 10b... Orifice 11... Band 1! Electrode 2... Deflection electrode 3... Gutter 4... Housing 5... Compressed air introduction hole 6... Ink flying hole 7... Cleaning liquid discharge hole 8... Cleaning liquid supply section 9... Print head Tokutoppan Printing Co., Ltd. Representative Kazuo Suzuki Figure 1 Figure 2

Claims (1)

[Claims] (1) A print head for an inkjet printer that discharges ink particles from an orifice of an ink reservoir, charges the ink particles with a charging electrode, and flies the charged ink particles in a predetermined direction with a deflection electrode, the ink reservoir An orifice, a charging electrode, and a deflection electrode are arranged in the housing, and a compressed air introduction hole is provided on the top surface of the housing.
A print head for an inkjet printer, characterized in that an ink flying hole is formed on a side surface, a cleaning liquid discharge hole is formed on a bottom surface, and a cleaning liquid supply section that spouts cleaning liquid is provided above the orifice, charging electrode, and deflection electrode, respectively.