JPS5998853A - Multi-stylus head - Google Patents

Abstract

PURPOSE:To improve the contact state of a contact part and an ink ribbon while preventing the lowering in dot density and the generation of dot omission to achieve the enhancement of recording quality, by protruding the contact part of a needle electrode from a head contact surface. CONSTITUTION:For example, a needle electrode 12 with wire diameter of 60mum is formed of an embedded part 12b embedded in an enclosing and embedding member 4 and an outer pour molding member 10 and the contact part 12a protruded from a head contact surface 11a. Said enclosing and embedding member 4 is formed of a mixture prepared by adding a SiC powder to epoxy resin and the outer pour molding member 10 is formed of epoxy resin. On the other hand, the embedded part 12b of the needle electrode 12 is formed of a copper wire and copper plating is applied to the end surface 12c of the embedded part 12b to form the contact part 12a in a state protruded from the head contact surface 11a. By protruding the contact part of the needle electrode from the head contact surface, all of a plurality of the needle electrodes can be certainly contacted with an ink ribbon and no discharge is generated while the lowering in dot density or the generation of dot omission can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-stylus head used in a recording device such as a facsimile or a computer processor, and more specifically to a multi-stylus head used in an electrical transfer recording system.

Conventional multi-stylus heads of this type include those shown in FIGS. 1 to 3, for example. That is, this multi-stylus head l is formed into a long plate shape with a large number of needle electrodes 2 and return electrodes 3 made of copper wire embedded in an embedding member 4 made of insulating resin. Needle electrodes 2 are arranged in a row, and return electrodes 3 are spaced apart from each other on both sides of these needle electrodes 2. The contact portion 2a of the needle electrode 2 and the return electrode 3 are exposed on the same plane as the flat head contact surface 1a.

Such a multi-stylus head 1 is arranged, for example, as shown in FIG. 1, as a part of a recording apparatus using an electrical transfer recording method. Specifically, the multi-stylus head 1 and the roller 5 are arranged with a slight distance between them, and an ink ribbon 6 and a recording paper 7 are placed in this gap between the ink ribbon 6 and the contact portion 2a of the needle electrode 2 and the return path. It is interposed in a state in which it is in contact with the electrode 3. In addition, code 8
9 is a row for moving the ink ribbon 6 and the recording paper 7.

Here, the current transfer recording method will be explained with reference to FIG. First, when a pulsed voltage, that is, a signal voltage is applied to the multi-stylus head 1, a pulsed current flows between the needle electrode 2 and the return electrode 3 via the ink ribbon 6.

At this time, since the area of the contact part 2a of the needle type @2 is very small compared to the area of the return path electrode 4, the resistance is overwhelmingly larger under the needle electrode 2, and the current is , is the same under the needle electrode 2 and under the return electrode 3, so most of the Joule heat generated by the current flowing through the system is generated under the needle electrode 2. The generated heat melts the six ink ribbons 71 under the sword-shaped electrode 2, and the ink is transferred to the recording paper 7 in the shape of a drum and fixed. This is done when the contact portion 2a of the nail-shaped electrode 2 slides on the ink ribbon 6, and one character or the like is drawn on the recording paper 7.

However, since the current transfer recording method requires that the contact portion 2a of the needle electrode 2 and the ink ribbon 6 come into contact with each other, the end surface of the contact portion 2a of the needle electrode 2, which has a small area, comes into contact with the head as in the conventional method. If the head contact surface 1a is formed on the same plane as the surface 1a, poor contact may occur between the contact portion 2a and the ink ribbon 6 even when the head contact surface 1a is in contact with the ink ribbon 6, resulting in a decrease in dot density and There is a risk of deterioration in recording quality such as the occurrence of missing dots.

■--Neck This invention was made by paying attention to the conventional situation, and by making the contact part of the needle electrode protrude from the head contact surface, the contact state between the contact part and the ink ribbon is improved. It is an object of the present invention to provide a multi-stylus head that improves recording quality by preventing a decrease in dot density and occurrence of dot omission.

EXAMPLE 1 The present invention will be explained below based on the drawings. In this description, parts or members that are the same or equivalent to those in the prior art will be designated by the same reference numerals, and redundant description will be omitted.

FIG. 5 is a diagram showing a first embodiment of the present invention.

First, to explain the configuration, the reference numeral 12 in the figure has a wire diameter of 6, for example.
The embedding member 4 and the externally shaped casting member 10 are made of needle-like electrodes with a diameter of 0μ.
It is formed from a buried portion 12b buried in the head contact surface 11a and a contact portion 12a protruding from the head contact surface 11a. The embedding member 4 is formed by adding powder (inorganic particles) such as SiC or SiN to epoxy resin, and the externally shaped casting member 11 is formed of epoxy resin. On the other hand, the buried part 12b of the needle-shaped type ′@12 is made of copper wire, Nl wire, copper-N
Although it can be formed of an i-line, a stainless steel wire, a tungsten wire, a gold wire, or a surface-treated material thereof, it is formed of a copper wire in this embodiment. The end surface 12c of the buried portion 12b is plated with copper to form a contact portion 12a protruding from the head contact surface 11a. Note that the reference numeral 3 is a return electrode exposed on the head contact surface 11a.

Next, the multi-stylus head 11 having such a configuration will be described.
The molding method will be explained. First, the embedded part 1 of the needle electrode 12
2b and the return electrode 3 are embedded with the embedding member 4 and the contour casting member 10. Thereafter, the embedding member 4, needle electrode 12, and return electrode 3 are cut and polished to form the head contact surface 11a.
is formed into a flat surface, and the end surface 12c of the buried portion 12b and the return electrode 3 are exposed from this surface 11a. In this state, it is formed into the same shape as before. Next, the contact part 12a
To form it, proceed as follows. That is, after forming the head contact surface 11a, the end surface 12c of the buried portion 12b is formed.
Quickly mask the return electrode 3 with tape so as not to oxidize it as much as possible, and immerse it in an electrolyte containing 10% steel sulfate. A copper piece anode is provided in this electrolytic solution, each of the buried portions 12b of the numerous needle electrodes 12 is used as a cathode, and these two electrodes are spaced apart from each other by about 20 circles. Shigaru @240mV
When this voltage is applied for 2 minutes and 30 seconds, copper is deposited on the end surface 12c of the buried portion 12b and adheres to the end surface 12c protruding by 10 to 20 μm, thereby forming the contact portion 12a of the needle electrode 12.

Such a multi-stylus head 11 is used in a recording device using an electric transfer recording method. In this case, the state of contact between the multi-stylus head 11 and the ink ribbon 6 depends on whether the contact portion 12a of the needle electrode 12 or the head contact surface 1
．． Since it protrudes from 1a, all the wires of the needle electrode 12 are in reliable electrical contact.

One of the return electrodes 3 has a large area and the amount of protrusion of the contact portion 12a is also on the order of μ, so of course they come into contact with each other.

In this state, a signal current is applied and the rollers 5°8.
When the ink ribbon 6 is moved and slid against the multi-stylus head 11 using a stylus 9 or the like, the electrical contact is ensured, so there is no drop in dot density or dot removal, and the result is good. Characters are recorded with good print quality. Note that since the contact portion 12a does not protrude so much, it goes without saying that this will not damage the ink ribbon 6.

In the first embodiment, the contact portion 12a is formed by copper plating, but if a metal harder than copper, such as nickel, is attached by plating or the like, it is possible to prevent wear caused by sliding with the ink ribbon 6. Durability can be imparted, and as a result, the durability of the multi-stylus 11 can be improved. Furthermore, it goes without saying that the deposition is not limited to plating, but may also be accomplished by vapor deposition or the like.

Further, FIG. 6 shows a second embodiment of the present invention.

In this embodiment, the embedded part 22b of the needle electrode 22 and the contact part 22
A is formed from a single piece of copper wire, for example.

To form this multi-stylus head 21, the needle electrode 22 and the return electrode 3 are buried with the embedding member 4 and the contour casting member 10, and then when the head contact surface 21a is formed, the needle electrode 22 is left without being cut and polished together to form a contact portion 22a that slightly protrudes from the head contact surface 21a.

The operation when this multi-stylus head 21 is used in a recording device is the same as that in the first embodiment, so the explanation will be omitted.

In each of the above embodiments, the multi-stylus head 11.21 was provided with the return electrode 3.

Of course, it is also possible to form the multi-stylus head of the present invention using only the embedding member and the needle-shaped electrode, with the return path electrode 3 being made separately. However, by integrating the return electrode 3, this device becomes compact when used in a recording device. Further, the needle electrodes 12 and 22 can of course be arranged in two rows in a staggered manner.

As described above, according to the present invention, by making the contact portions of the needle electrodes protrude from the head contact surface, all of the needle electrodes can be reliably brought into contact with the ink ribbon. There is no occurrence of discharge or the like, thereby preventing a decrease in per-cut density and occurrence of dots, etc., thereby achieving the effect that good recording quality can be obtained.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view showing a recording device using a conventional multi-stylus head, Fig. 2 is a diagram showing part of the head contact surface of the conventional multi-stylus head, and Fig. 3 is a diagram showing a part of the head contact surface of the conventional multi-stylus head. 4 is a schematic diagram for explaining the current transfer recording method, FIG. 5 is a sectional view similar to FIG. 3 showing the first embodiment of the multi-stylus head of the present invention, and FIG. FIG. 6 is a sectional view similar to FIG. 5 showing a second embodiment of the invention. 4...Embedding member, 6...Ink ribbon, 11.21
...Multi-stylus head, 11a, 21a River head contact surface, 12.22...Acicular electrode, 12a, 22a
- contact part, 12b. 22b... Buried part, 12c... End surface.

Claims (3)

[Claims] (1) A multi-stylus head in which a contact portion of a large number of needle-shaped electrodes embedded in a row in an embedding member slides on an ink ribbon, and the needle-shaped electrodes are embedded in the embedding member. A multi-stylus head comprising a buried portion and a contact portion protruding from the head contact surface. (2) The multi-stylus head according to claim 1, wherein the contact portion is formed by applying metal plating to the end face of the buried portion. (3) The multi-stylus head according to claim 1, wherein the needle-shaped electrode is made of a single wire rod in which the buried portion and the contact portion are continuous.