JPH04267155A - Head of ink jet printer - Google Patents

Abstract

PURPOSE:To easily apply printing even to the lower position of the object to be printed fed on a feed apparatus by obliquely providing the base for fixing a mechanism generating ink particles and bonding them to the predetermined position of the object to be printed with respect to the center axis of a head. CONSTITUTION:In the head 6 of an ink jet printer, the ink stream injected from a nozzle 4 is formed into ink particles in the vicinity of a charging electrode 1 and the ink particles are charged in the charge quantity corresponding to a character signal and deflected when they pass through a deflection electrode 2 to be bonded to an object 7 to be printed to print a character constituted of dots. In this case, the base 5 on which the nozzle 4, the charging electrode 1, the deflection electrode 2 and a gutter 3 are mounted is provided so as to be inclined by about 4 deg. with respect to the center axis of the head 6. By this constitution, a printing position can be lowered to a position (c) and printing can be applied to the lower part of the object 7 to be printed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inkjet printer head.

0002

2. Description of the Related Art Inkjet printers print by ejecting minute ink droplets, so the ink droplets are susceptible to disturbances during flight, resulting in poor print quality. Therefore, the distance between the head and the non-printed object cannot be increased more than necessary.

FIG. 2 shows a front view of a conventional head. The ink flow ejected from the nozzle 4 turns into ink particles near the charging electrode 1. Here, the ink particles are charged with an amount of charge corresponding to the character signal. The charged ink particles are deflected when passing through the deflection electrode 2 and reach the non-printed object 7. The uncharged ink particles are collected in the gutter 3.

[0004] The nozzle 4, charging electrode 1, deflection electrode 2, and gutter 3 are fixed to a base 5, and the base 5 is attached parallel to the central axis of the head 9.

In FIG. 2, when the head 9 is in a positional relationship as shown in FIG. 2 with the non-printed object 7 and the conveying device 8 that conveys the non-printed object 7, the printing position is at position a. Therefore, when printing on the non-printed object 7 flowing above the conveyance device 8 further below the position a, for example, by raising the position of the non-printed object 7, a space is created between the conveyance devices 8, and the head 9
Make allowance for the lowering, and also modify a part of the conveying device 8
It was necessary to take measures such as creating a place to insert the head 9.

[0006]

In the prior art, the base was located at the center of the head, and the ink jetting direction was parallel to the central axis of the head. For this reason, it has been difficult to print at a position below the non-printed object on the conveyance device.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inkjet printer head that can print at a position below a non-printed object flowing on a conveyance device without modifying the conveyance device.

[0008]

[Means for solving the problem] In an inkjet printer head, a base for fixing a device that generates ink particles and adheres the ink particles to a predetermined position on a non-printed object is attached to the central axis of the head to which the base is attached. I made it tilt.

[0009]

[Operation] By tilting the base with respect to the central axis of the head, the flight direction of the ink particles is tilted, making it easier to print on non-printed objects at lower positions on the conveying device than with conventional heads.

0010

EXAMPLES Examples of the present invention will be described in detail below.

FIG. 1 shows an inkjet printer head to which the present invention is applied. In FIG. 1, an ink stream ejected from a nozzle 4 turns into ink particles near a charging electrode 1. In FIG. Here, the ink particles are charged with an amount of charge corresponding to the character signal. The charged ink particles are deflected when they pass through the deflection electrode 2. Ink particles unrelated to printing are in gutter 3
will be collected. The nozzle 4, charging electrode 1, deflection electrode 2, and gutter 3 are attached to the base 5. Its base 5
The base 5 is attached so as to be inclined 4 degrees downward in the deflection direction with respect to the central axis of the head 6 to which the head 6 is fixed.

FIG. 3 shows an example of application of the head 6 according to the invention. The head 6 prints on a non-printed object 7 flowing on a conveyance device 8 . In conventional heads, the central axes of the base and the head are parallel, so the printing position is between the central axis of the head 6 and the non-printed object 7.
It will be above the intersection point b with . Therefore, in order to print on the low position of the non-printed object 7 using the conventional head, there was no choice but to modify the conveyance device 8 and the like.

On the other hand, by tilting the base with respect to the central axis of the head 6, the printing position can be lowered to position c, and printing can be performed further below the non-printing object 7.

Further, another effect obtained by the present invention will be explained.

FIG. 4 shows an example in which the present invention is applied to a continuous flow type inkjet printer. FIG. 4A shows an example of printing with a conventional head 9. In FIG. 4(a), the ink droplets with the least amount of deflection are on the non-printing surface 11, which is separated by g from the head 9.
reaches 10g. Next, if the ink droplet is deflected by β, the ink droplet will arrive at a position d away from 10g. This d is taken as the reference pitch. If the distance g from the head 9 to the non-printing surface 11 is the same at every point on the non-printing surface 11, that is, if it is like the arc in the figure, then deflection by an integral multiple of β will reduce the distance between each ink particle. have the same pitch. However, in reality, the larger the amount of deflection, the longer the travel distance g and the larger the pitch between particles. When the maximum value of the deflection amount is α, the ink particles reach 10h of the non-printing surface 11, and the pitch becomes l. However, Fig. 4(b)
In the head 6 according to the present invention as shown in FIG. Therefore, the maximum pitch is also f, and the ratio of the difference from the reference pitch d (e-d): (f-d) is approximately 2 when α is 8°.
:1. By tilting the base 5 like this head 6, the difference between the pitches becomes smaller and printing quality can be improved.

[0016]

Effects of the Invention The head according to the present invention can easily print even at a low position on a non-printed object flowing on a conveying device.

[Brief explanation of the drawing]

FIG. 1 is a front and plan view of a head according to the present invention.

FIG. 2 is a front view of a conventional head.

FIG. 3 is a diagram showing an example of application of the present invention.

FIG. 4 is a diagram showing an example of application to a continuous flow inkjet printer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Charging electrode, 2... Deflection electrode, 3... Gutter, 4... Nozzle, 5... Base, 6... Head.

Claims (1)

[Claims] [Claim 1] An inkjet printer that prints characters made up of dots by depositing ink particles at predetermined positions on a non-printed object. An inkjet printer head characterized in that a base for fixing an attachment mechanism is tilted with respect to the central axis of the head to which the base is attached.