JPS60116466A - Constitution of ink type wire dot head - Google Patents

Abstract

PURPOSE:To attach ink to the tip face of a wire stably by arranging an ink guide member having a groove for connecting a clearance with a wire guide and an ink tank and filling an ink-absorbable porous material. CONSTITUTION:When a coil 9 is energized, a plunger 7 facing a coil core 8 is attracted to turn a clapper 6 fastened on the plunger 7 so that a wire 1 engaged at the tip thereof sticks out. The wire tip surface puts ink thereon piercing an ink meniscus and hits a recording paper to transfer ink onto the recording paper. At the standby state of the wire, as the tip face of the wire 1 is located inward from the end face of a wire guide 3 while the ink meniscus is formed in front of the wire tip surface, ink is attached to the wire tip surface sequentially with the driving in or out of the wire 1. An excess ink at the front of the wire guide 3 is drawn into a recovery groove by a capillary action.

Description

[Detailed Description of the Invention] Technical Field> 11 The present invention is a method of drawing figures, characters, etc. by colliding a wire gold recording paper with ink adhered to the tip thereof to transfer the ink onto the paper and forming dots. This invention relates to an ink dot printer plotter head. 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 for supplying ink from an ink tank to the tip of a wire involves guiding ink from the tank using a member made of a porous material that has ink absorbing properties, and then passing the wire through the porous material. A method of configuring it so as to penetrate through the material is known. In this method, the diameters of the micropores that form the porous material are distributed within a certain range and are not uniform, resulting in large individual differences in ink absorption and variations in the amount of ink retained near the tip of the wire. fat fool p
However, it was unstable because the dimensions of the porous material were likely to change or deform due to interaction with the side surface of the wire. This has the disadvantage that the dot density becomes unstable.

2- Also, as seen in Japanese Patent Laid-Open No. 57-82989, a gap is formed by overlapping plate-shaped guides near the tip of the wire, and this is used as an ink reservoir, and ink from an ink tank is supplied to this ink reservoir gap by a pump. A method is also known in which the tip of the wire passing through this area is also supplied using capillary force. In this method, the structure of the joint between the pump and the head is complicated, which increases costs.Also, in order to obtain sufficient pump performance, sufficient sealing is required, and a drive source with high torque is required to drive the pump. It had the following drawbacks. (In the case of multicolor heads, the structure is particularly complicated)) It has been difficult to apply this method to small heads.

Purpose of the present invention The purpose of the present invention is to stably supply ink from an ink tank to the tip of a wire, and furthermore, to supply ink to the tip of the wire and stably adhere the ink to the tip surface of the wire to obtain an appropriate dot density. The object of the present invention is to provide a head with a simple structure.

<Example> The present invention will be described in 8-8 based on the drawings showing one embodiment of the present invention. Station 5 will light up.

The head of this embodiment is a head for a four-color printer/plotter, and includes black, red, green, and blue ink systems, and one wire for each color. A four-color color printer/plotter has a structure in which 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 on the recording paper to form dots and draw characters and figures. It has become.

FIG. 1 is an exploded view of the head, FIG. 2 is a sectional view, and FIG. 8 is an exploded view of the ink guiding section.

An ink tank 4-b for black ink with four ink tanks, which has an ink tank 4 removably disposed above the head.
It has a two-piece structure: and a tank 4-α whose interior is divided into eight parts for color ink.

A tank filler 12 made of a porous material 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 groove 2α is filled with a porous material having ink absorbing properties, and the porous material m is in contact with the tank filling material 4-12. . 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. A wire guide 8 is incorporated into the circumferential groove 2b.

Gaps indicated by A and B are provided by the combination of the two.

Furthermore, the gap between the wire 1 and the wire guide hole 8α of the wire guide 2 is small, and the ink flows from the ink tank 4 to the ink guide groove 2α of the ink supply guide 2 and the gaps A and B' between the wire guide 8 and the wire guide hole 8α. ii, and is guided by capillary force to the tip of the wire 1.

The wire driving device has a coil core 8f around which a coil 9 is wound:
The yoke lO, the yoke plate 11, and the plunger 7 constitute a magnetic circuit. The movement of plunger 7 is clapper 6
is transmitted to wire 1 via.

The tip surface of the wire is located deeper than the tip surface of the wire guide 8, and the ink hole formed in the front part of the wire guide hole 3α.
The wire length is set so that the thin layer covers the wire tip surface.

Next, the operation will be explained. When the coil 9 is energized, the plunger 7 facing the coil core 8 is attracted and pulled. As a result, the clapper 6 to which the plunger 7 is fixed rotates, and the wire 1 engaged at its tip protrudes.

The tip end surface of the wire pierces the ink menscus, 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 8, and an ink menscus 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. Note that the excess ink on the front surface of the wire guide 8 is drawn into the collection groove 3b by capillary force, and therefore flows back to the ink supply guide 2 without overflowing and staining the recording paper.

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 keep the amount of ink held there constant.

In the above head structure, the mesh of the porous material 20 filled in the ink guiding groove 2a from the ink tanks 4 to 6 to the wire guide 3 is appropriately selected to exert an appropriate capillary action to prevent ink from overflowing. Ink can be guided and supplied to the ink reservoir gap in an amount required for printing. Further, the gap between the wire guide 8 and the ink supply guide 2 can be dimensioned so that the ink supply function and the ink retention function are performed by capillary action. The dimensions of the vicinity of the tip of the wire that has the ink retention function 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., the precision is high in the head structure of the present invention. Has stable ink retention ability. ) 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.

In addition, in the previous embodiment, the points placed above the entire tank head are
As explained in the above section, even if the tank is placed below the wire, stable printing density can be obtained by the ink guiding method of the present invention.

7- Effect> 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. It is possible to stably obtain an appropriate dot density.

Since the structure of the present invention 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 sufficiently separated to prevent color mixing.

[Brief explanation of the drawing]

Fig. 1 is an exploded view of a head showing one embodiment of the present invention;
The figure is a sectional view of the embodiment shown in FIG. 1, and FIG. 3 is an exploded view of an ink guide section showing an embodiment of the present invention. 1: Wire 2: Ink supply guide 3: Wire guide 4: Ink tank 20: Porous material. Applicant: Evenn Co., Ltd. Agent Patent Attorney Mogami 8-/4 Figure 1 Figure 2

Claims (1)

[Claims] A wire that guides the wire near an ink tank and the tip surface of the wire in an ink-type wire dot head that projects a wire and collides with the recording paper to transfer the ink attached to the tip of the wire onto the recording paper to form a dot. a guide, and an ink guide member that connects and connects the ink tank and the wire guide, and has a gap between the wire guide and the ink guide member in a combined state, and the ink guide member has a gap between the wire guide and the ink guide member. 1. A structure of an ink-type wire dot head, comprising a groove connecting the gap and the ink tank, and the groove is filled with a porous material having ink absorbing properties.