JPS6082364A - Construction of ink type wire dot head - Google Patents

Abstract

PURPOSE:To feed and attach ink stably to the wire tip by forming a gap between a wire guide and an ink induction member in the assembly so as to communicate with an ink tank through a groove of the induction member. CONSTITUTION:With a energization of a coil 9, a plunger 7 is attracted as opposed to a coil core 8 and a clapper 6 turns to make a wire 1 stick out. The tip face of the wire pierces an ink meniscus and hits a recording paper putting ink thereon to transfer it onto a recording paper. Since the tip face of the wire 1 is located inward from the end face of a wire guide 3 and the ink meniscus is formed ahead of the wire tip face, with the lifting and sinking of the wire, ink attaches sequentially to the wire tip face. The width and depth of an induction groove 2a is set at a proper value from an ink tank 4 to the wire guide 3 to cause an appropriate capillary action thereby enabling the introduction of ink by amount only required for printing without overflow.

Description

Detailed Description of the Invention [Technical Field] The present invention relates to an ink dot printer that draws figures such as nine characters by colliding a wire with ink adhered to the tip surface against recording paper to transfer the ink onto the paper and forming dots. Regarding plotter heads. More specifically, the present invention relates to the structure of an ink guide section that guides ink from an ink tank to a wire tip.

<Prior art> As seen in US Pat. No. 4,194,846, a method of supplying ink from an ink tank to the tip of a wire involves guiding the ink from the tank using a member made of a porous material that has ink absorbing properties, and then the wire passes through the porous material. There are known methods of configuring the device so that it comes into contact with the device. In this method, the hole diameters of the micropores forming the porous negative control vary within a certain range and are not uniform, resulting in large individual differences in ink absorbency, which tends to cause over- or under-supply of ink to the tip of the wire. Furthermore, the amount of ink held near the tip of the wire not only varied widely, but also was unstable because the dimensions of the porous material were likely to change or deform due to the 4H interaction with the side surface of the wire. This has the disadvantage that the dot performance becomes unstable.

Also known is a method of supplying ink from an ink tank to the tip of a wire using a positive pump, as shown in Japanese Patent Laid-Open No. 57-32989. In this method, the structure of the connection part between the pump and the head is complicated. It has disadvantages such as increased cost, the need for sufficient sealing in order to obtain sufficient pump performance, and the need for a drive source with large torque to drive the pump.In the case of multicolor heads, 1 'The structure is quite complicated and it is difficult to apply it to small heads.

<Purpose> The purpose of the present invention is to provide a head with a simple structure that can stably supply ink from an ink tank to the tip of the wire, and also stably adhere the ink to the tip of the wire to obtain an appropriate dot a degree. The goal is to provide the following.

<Example> The present invention will be described based on drawings showing an example of the present invention.

The head of this embodiment is a four-color printer/plotter head, and includes black, red, green, and blue inks, and one wire for each ink. In a four-color color printer/plotter, one or both of the head and the recording paper are moved and a wire corresponding to the desired color of the head is projected at a predetermined position W1 on the recording paper to form dots and draw characters and figures. It is built in 57 buildings.

FIG. 1 is an exploded view of the head, FIG. 2 is a sectional view, FIG. 6 is an exploded view of the ink guiding section, and FIG. 4 is a sectional view of the ink guiding section of another embodiment.

It has an ink tank 4 that is removably disposed above the head. Ink tank 4 is ink tank 4-b for black ink.
It consists of a tank 4-α, which is divided into three parts for color ink, and a tank 4-α for color ink.

A tank filler 12 made of a porous material and filled in the ink tank 4 is impregnated with ink. The ink supply guide 2 has an ink guide groove 2α extending in the axial direction, and the tank filler 12 is in contact with the ink guide groove 2α.

r9 and the depth of the ink guide groove 2α are set to appropriate values to stably supply ink from the ink tank 12. A circumferential groove 2b is provided at the front of the ink supply guide 2, and is connected to an ink guiding groove 2α at an inner portion 2c. Circumferential groove 2
The wire guide 3 is incorporated in h, and gaps shown by A and B are provided by the combination of the two. Furthermore, the gap between the wire 1 and the wire guide hole 3a of the wire guide 3 is small, and the ink flows from the ink tank 4 to the ink guide groove 2α of the ink supply guide 2, and between the wire guide 3 and the MA.
In this embodiment, the four-color wire drive device is guided by capillary force to the tip of the wire 1 through B, and includes a yoke 1o having a coil core 8 around which a coil 9 is wound, a yoke plate 11, and a plunger 7.
A magnetic circuit is constructed. The movement of the plunger 7 is transmitted to the wire 1 via the clapper 6. The wire driving device described above is covered by a cover 14 and the operating length of the clapper B is regulated. The distal end surface of the wire is located further back than the distal end surface of the wire guide 3, and is located in the wire guide hole 3α.
The wire length is set so that the menscus of ink formed at the front portion of the wire covers the tip surface of the wire.

Next, the operation will be explained. It is necessary to energize coil 9.
, J: l) The plunger 7 facing the coil core 8 is attracted. As a result, the clapper 6 to which the plunger 7 is fixed rotates, and the wire 1 to be engaged at its tip protrudes. The tip end surface of the wire pierces the ink tank, causes ink to adhere to the tip end surface, and collides with the recording paper, so that the ink is transferred to the recording paper. In the wire standby state, the distal end surface of the wire 1 is located inside the end surface of the wire guide 3, and an inktance scum is formed in front of the wire distal end surface, so that ink sequentially adheres to the wire distal end surface as the wire moves in and out.

Details regarding the ink dot printing method, such as the transfer of ink to the wire at the tip of the wire mentioned above, are described in detail in Japanese Patent Application No. 55-81609 filed by the present applicant. This section is omitted because it relates to the ink guiding and ink retaining functions.

The excess ink on the front surface of the wire guide B is drawn by capillary force into the collection groove 56, which is a narrow groove with a V-shaped cross section, provided on the front surface and (If! 1 side), so it may overflow and stain the recording paper. The ink flows back into the ink supply guide 2 instead.

In order to obtain an appropriate dot density in ink dot inking, it is necessary to stably adhere an appropriate amount of ink to the tip surface of the wire.

Therefore, it is necessary to keep the diameter of the wire guide hole at an appropriate size near the tip of the wire, and to supply ink from the ink tank in just the right amount.

In the above head structure, by setting the width and depth of the ink guide groove 2α to appropriate values from the ink tank 4 to the wire guide 3, an appropriate amount of capillary action is exerted to prevent ink from overflowing and only the amount required for printing is achieved. Let the ink guide you! - can be done. Also, the wire guide 32
The gap between the ink supply guides 2 can also be dimensioned to provide ink supply and ink retention by capillary action. The dimensions of these ink guide paths depend on the shape accuracy of the parts, but since the component parts have shapes that can be easily processed with high precision by molding etc., their precision is high and the head structure according to the present invention has a stable ink supply ability. has. It is also easy to assemble because it consists of a small number of parts.

Furthermore, due to the lubricating effect of the ink, there is no wear and deformation even after long-term operation, and the initial performance is maintained over a long period of time.

Note that FIG. 4 is a sectional view of an ink fat conducting member 2' showing another embodiment. This is a single component 2' that combines the ink supply guide 2 and wire guide 3 in the previously described embodiment, and has a structure in which the narrow grooves indicated by 2'b have both an ink guiding function and an ink retaining function. It has become. The operation is similar to that described for the previous embodiment.

In the previous embodiment, the ink tank was arranged above the head, but even when the tank is arranged below the wire, stable printing density can be obtained by the ink guiding method of the present invention.

Effects> As explained above, according to the present invention, ink can be stably supplied from the ink tank to the tip of the wire with a simple structure, and the ink can be stably attached to the tip surface of the wire at the tip of the wire. An appropriate dot nQ degree can be obtained.

Further, in the head of the present invention, the amount of ink absorbed into the ink guiding path system is smaller than that of the head using a porous material as described in the conventional example. Therefore, the amount of ink absorbed and not used for printing is reduced, and the ink in the ink tank can be effectively used for printing.

In addition, for the same reason, even if the ink becomes highly viscous or solidified due to running out of ink in the tank or drying at high temperatures, the ink can quickly reach the tip of the wire by attaching the ink tank. It also has the effect that printing can be resumed once the printing has been reached.

Furthermore, since the structure is simple, the volume occupied by the ink supply system is small, and even in the case of a multicolor head, the ink systems of each color can be separated with sufficient intervals to prevent color mixing.

[Brief explanation of the drawing]

Fig. 1: An exploded perspective view of a head showing an embodiment of the present invention Fig. 2: Also a sectional view Fig. 3: An exploded perspective view of a head showing an embodiment of the present invention FIG. 4 is an exploded perspective view of the ink guide section shown in FIG. 4. A sectional view of the ink guide section showing another embodiment of the present invention. FIG.

Claims (2)

[Claims] (1) In an ink-type wire dot head that makes a wire protrude and collide with the recording paper, and transfers the ink that has arrived at the tip of the wire to the recording paper to form a dot, the wire is connected near the ink tank and the tip of the wire. A guiding wire guide and an ink guiding member connecting the ink tank and the wire guide are connected, and a gap is formed between them when the wire guide and the ink guiding member are combined, and the ink guiding member is connected to the ink guiding member. A structure of an ink-type wire dot head characterized by having a gap and a groove connecting the ink tank. (2) In an ink-type wire dot head in which a wire is made to protrude and collide with the recording paper, and the ink adhering to the tip of the wire is transferred to the recording paper to form a dot, the wire is inserted near the ink tank and the tip of the wire. An ink-type wire dot head structure comprising: an ink supply member having a wire guide hole for guiding, the ink supply member having a groove connecting the ink tank and the wire guide hole.