JPS59188448A - Ink dot printer - Google Patents

Abstract

PURPOSE:To permit clear-cut printing even when adjacent needles are concurrently driven by providing an aperture enough to prevent clogging of magnetic ink between the tips of the needles. CONSTITUTION:When a magnetic coil 15 is electrically energized, magnetic ink 19 stored in an ink supply box 20 is sucked into a magnetic field slit 16 to form a magnetic ink film 21, and the magnetic ink 19 is ahdered to the tip of a needle 12. On the basis of a printing command, any of the needle is driven, the magnetic ink 19 is transferred to a recording paper to form dots, and letters, etc., are printed. Since an aperture 14 of an interval enough to prevent the clogging of the magnetic ink 19 by capillary action is provided between the adjacent needles 12, only the magnetic ink 19 adhered to the tips 13 of the needles 12 is transferred to the recording paper.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention In this invention, the tip of a selectively driven needle is brought into contact with a recording paper to form dots, and a collection of these dots is used to print characters, etc. The invention relates to an ink dot printer.

Technical background of the invention and its problems In general, there are wire tod printers, thermal printers, etc. as dot printers, but among these, wire tod printers that print by selectively driving needles collide the needles directly against pressure-sensitive paper. Alternatively, a printing ribbon may be used to cause the needle to collide with the recording paper. Therefore, the noise is extremely loud.

Therefore, a method has been proposed in which magnetic ink is attached to the tip of a needle and the needle is selectively driven to bring the tip into contact with the recording paper. however,
In this type of printer, a large amount of magnetic ink exists between the needles, so when nine adjacent needles are driven simultaneously, this large amount of magnetic ink is transferred onto the recording paper and spreads, creating large dots in some areas. It has the disadvantage that it cannot be formed and clearly printed.

OBJECTS OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to provide an ink dot printer that can print clearly even when adjacent needles are driven simultaneously.

SUMMARY OF THE INVENTION This invention provides a gap between the tips of the needles so that the magnetic ink does not fill up. The structure is such that only the magnetic ink adhering to the recording paper is transferred onto the recording paper, and even if adjacent needles are driven simultaneously, the formation of large dots in some areas can be prevented and clear printing can be performed.

Embodiment of the Invention An embodiment of the invention will be described with reference to FIGS. 1 to 6. First, recording paper (2) is wound around the platen (1), and a carriage ( 4) is provided. This carriage (4
) is connected to a drive wire (5), and this drive wire (5) connects to the drive pulley (7) of the carriage motor (6).
It is wound around this driving pulley (7) and a driven pulley (8) spaced apart from each other.

A needle head (9) and an ink film forming body α1 are attached to the carriage (4). The needle head (9) has a head part 01) in which a plurality of needle magnets (not shown) serving as a driving part are arranged, and the needles α driven by the needle magnets are urged in the return direction. There are several books provided. The tips OJ of these needles 0'2 are arranged in a vertical line, and
The needle 0 is formed into a thin shape by cutting along the axial direction of the needle 0. Further, a gap 0j is formed between the tips 0j of these needles (2) at a distance that will not be filled with magnetic ink, which will be described later, due to capillary action.

Next, the ink film forming body 10) has two electromagnetic coils above it, and side walls α integral with the magnetic pole side forming a magnetic field Qd are formed at opposite ends of the electromagnetic coils 09. Things are connected. The tip 0j of the needle α2 extends into the magnetic field slit αd, and the tip of the magnetic pole Cl71 extends into an ink replenishment chamber (A) in which magnetic ink (1 ml) is stored.

In such a configuration, when the electromagnetic coil α9 is energized, the magnetic ink 09) stored in the ink replenishment storage is attracted into the magnetic field slit 0υ, and a magnetic ink film (c) is formed. Further, the magnetic ink (2) adheres to the tip α1 of the needle α located within the magnetic field slit αG.

Then, one of the needles (6) is driven based on the print command, and thereby the magnetic ink (2) attached to the tip a3 of the needle 0η is transferred onto the recording paper (2) to form a dot. By repeating this process, characters such as υ are printed. At this time, adjacent needles (6) may be driven at the same time, but a gap α4 is provided between the needles (B) at a distance that prevents the magnetic ink α from filling due to capillary action. , no magnetic ink exists between adjacent needles 0, and only the magnetic ink α adhering to the tip αJ of the needle (A) is transferred onto the recording paper (2). Therefore, even if adjacent needles α are driven at the same time, large dots are not formed locally, and clear printing can be performed.

In addition, as shown in FIG. 7 to FIG. 9 as an example, the tip α1 of the needle α■ may be formed thin in various shapes to form a hole 4 in the gap, and as shown in FIGS.
As shown in FIG. 1, even when a prismatic needle (6) is used, the tip portion α1 is formed thin and a gap 04 is formed.

Also, the magnetic ink a! between the tip α9 of the needle oz!
The gap α4 that cannot be filled can be formed by widening the gap between the tips of the needle 02 without making it thin, and even if the tip of the needle (6) is not made thin. It can also be formed by coating the circumferential surface of the tip with a liquid-repellent coating 1. Power, needle (
When the circumferential surface of the tip of 2) is coated with a liquid repellent, the magnetic ink adheres only to the end surface of the tip of the needle αη that comes into contact with the recording paper (2), so the dot does not spread and is clear. Can print.

Effects of the Invention Since the present invention is constructed as described above, the magnetic ink does not get buried between the tips of the needles, so that it does not stick to the tips of the needles even if adjacent needles are driven at the same time. Only the magnetic ink is transferred to the recording section, and this results in 9
This has the effect of preventing the formation of large dots in some areas and making it possible to print clearly.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view showing one embodiment of the present invention;
The figure is a perspective view, FIG. 3 is a plan view, FIG. 4 is a side view, FIG. 5 is a perspective view of the needle, FIG. 6 is a side view of the needle, and FIGS. 7 to 11 are FIG. 7 is a perspective view showing a modified example of the needle. 2...Recording paper, 12...Needle, 13...Tip, 14...Gap, 19...Magnetic ink, 21...
・Magnetic ink film Applicant: Tokyo Electric Co., Ltd. I to 5 Kun] 6 17 Fig. 0 Fig. q Fig. 2 also J, J drawing procedure correction band (gi) July 25, 1980 Patent application 1986-64229 No. 2, Name of the invention Ink dot printer 3, Relationship between the person making the amendment, Takeshi Tsukita Patent applicant 4, Agent Address: 5-9-15 Minami-Aoyama, Minato-ku, Tokyo 107 None 6, Specification subject to amendment 7 , Details of the amendment As shown in the attached sheet, the statement in the specification of this application is amended as follows. 1, the claims in lines 3 to 10 of page 1 are amended as shown in the attached sheet. 2. "Between the tip of the needle" on the 20th line of the second page is corrected as follows. "Between the tips of the needle when bringing them into contact with the recording paper" 3. "Between the tips of the needle" on page 6, lines 14 and 15, as follows: to correct. "When the tip of the needle is brought into contact with the recording paper, between these tips" 1- Attachment 2, Claims Forming a magnetic ink film of magnetic ink, and driving the magnetic ink by a drive unit, the magnetic A plurality of needles are provided to bring the tips of the ink film attached with the magnetic ink into contact with the recording paper. An ink dot printer characterized by providing gaps that are not filled with ink. 2-

Claims (1)

[Claims] A magnetic ink film is formed using magnetic ink, and a plurality of needles are provided that are driven by a drive unit to bring the tips of the magnetic ink films, to which the magnetic ink is adhered, into contact with the recording paper. An ink dot printer characterized in that a gap is provided between the two so that the magnetic ink does not fill the gap.