JPS6027558A - Ink dot printer - Google Patents

Abstract

PURPOSE:To ensure a clear printing even under a continuous driving of needles by forming a magnet section at the tip of a plurality of needles for transferring a magnetic ink to a recording section. CONSTITUTION:Tips 16 of needles 15 are arranged vertically in one row and a magnet section 17 is formed at the end thereof. The magnet section 17 is magnetized with magnetic poles arranged along the axis of the needles 15. When an electromagnetic coil 18 is electrically energized, a magnetic ink 22 is attracted into a magnetic field slit 19 to form a magnetic ink film 24 while attaching to the tips 16 of the needles 15 positioned within the magnetic field slit 19. When the printing of a character or the like by gathering dots requires a continuous driving of the same needle 15, the magnet section 17 provided at the tips 16 of the needles 15 allows returned magnetic ink 22 to creep around and attach to the ends thereof quickly. This keeps the amount of the magnetic ink 22 so uniform as to ensure a clear printing.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a method for forming dots by bringing the tip of a selectively driven needle into contact with recording paper, and printing characters, etc. using a collection of these dots. This 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. Do you want me to do it?
A printing ribbon is interposed to cause the needle to collide indirectly with the recording paper. Therefore, the noise is extremely loud.

For this reason, a method has been considered in which magnetic ink is attached to the tip of a needle and the tip of the needle is brought into contact with recording paper to form a dotted track. However, when such a needle is continuously driven, the amount of magnetic ink that adheres to the tip of the needle gradually decreases because the magnetic ink does not wrap around the tip of the needle in time. The disadvantage is that the dots become thinner.

Purpose of the Invention The present invention has been made in view of the above points, and it is possible to rapidly replenish magnetic ink to the tip of the needle so that clear printing can be performed even when the same m-dol is continuously driven. The purpose of this invention is to obtain an ink dot printer that can be used.

Summary of the Invention In this invention, a magnet is formed at the tip of the needle to which magnetic ink adheres, so even if the same needle is continuously driven, the tip of the needle is rapidly replenished with magnetic ink, and therefore recording is possible. It is constructed so that the amount of magnetic ink transferred to the paper is uniform and clear printing can be performed.

Embodiment of the Invention A first embodiment of the invention will be described with reference to FIGS. 1 to 5. First, a recording paper (2) serving as a recording section is wound around a platen (1). A carriage (4) that reciprocates along a guide shaft (3) installed parallel to the platen (1) is provided in front of the platen (1). This carriage (4) has a drive wire (5)
The drive wire (5) is wound around a drive pulley (7) of a carriage motor (6) and a driven pulley (8) spaced apart from the drive pulley (7).

A needle head (9) and an ink film forming body (10) are attached to the carriage (4).The needle head (9) has a head portion in which a plurality of needle magnets α°C serving as a driving portion are arranged. A movable iron piece α9 is rotatably attached to each of the needle magnets α.Each of these movable iron pieces (2) has a return spring (1→ The heads of the needles (2) are abutted.These needles (
The tip portions α6 of (g) are arranged in a vertical line. A magnet portion width is formed at the end of the tip portion a0 of these needles, and this magnet portion α is magnetized with magnetic poles arranged along the axial direction of the needle 09.

Next, the ink film forming body αO has an electromagnetic coil α~ above it, and magnetic field slits ◇! are provided at both ends of the electromagnetic coil Qgl, facing each other. A side wall Q1) integral with the magnetic pole forming the magnetic pole is coupled. The magnetic pole (A) is extended downward, and its tip portion is covered with magnetic ink (A).
It extends into the ink replenishment tank where the ink is stored. Also,
The tip aQ of the needle α9 is located within the magnetic field slit (A).

In such a configuration, when the electromagnetic coil O is energized, the magnetic ink in the ink supply chamber (c) is attracted and supplied into the magnetic slit α field, and a magnetic ink film (c) is formed by the magnetic ink (c). It is formed. In addition, magnetic ink (a) adheres to the tips (lfe) of the needles α located within the magnetic field slits α.

Then, the needle (19) is driven based on the printing command, and as a result, the magnetic ink attached to the tip αG is zero.
2 is transferred onto a recording paper (2) to form dots, and a collection of these dots is used to print characters, etc. At this time, the same needle αG may be driven continuously (for example, E
(or when forming the horizontal line part of the letter L), since the tip αQ of the needle αQ is provided with a magnet part α, when it returns, the magnetic ink H quickly penetrates to the end and adheres. do.

Therefore, as the amount of magnetic ink Q2 adhering to the tip αG of the needle αυ gradually decreases, it becomes constant and the recording paper (2
) The amount of magnetic ink Q'4 transferred to the paper is maintained uniformly so that clear printing can be performed. In addition, since the magnetic poles of the magnet α provided at the tip ← 0 of the needle α9 are arranged along the axial direction of the needle αυ, the magnetic flux at the end surface of the tip 6 that contacts the recording paper (2) The density increases. Therefore, the magnetic ink (
A) wraps around and adheres to the surface, allowing for even clearer printing.

A second embodiment of this invention will be described based on FIG.

Although only one of the plurality of needles is shown in this embodiment, the needle (2) is made of a non-magnetic material, and a recess (A) that opens on the end face is formed at the tip (C) of the needle (C). , attach a magnet (C) that will become a magnet part along the axial direction of the needle (C) to the concave part (B) of the needle (C), and attach this magnet (C) to the tip (C) of the needle (C). The end face is also made to protrude. Therefore, the end surface of the magnet (C) comes into contact with the recording paper (not shown), but since the surface area of the magnet (C) is small, the amount of magnetic ink (2) that adheres to it is optimized. The magnetic ink (2) transferred to the recording paper does not spread and overlap adjacent dots, resulting in clear printing.

As shown in Fig. 7, the end face of the tip (C) of the needle) and the end face of the magnet) should be aligned, or as shown in Fig. 8, the end face of the tip (C) of the needle The magnet (c) is positioned backwards on the end face of ), and the amount of magnetic ink (a) adhering to the tip (c) is optimized by keeping the magnetic flux density of the magnet (c) at the tip in a good state. , clear printing may be performed.

A third embodiment of the present invention will be described with reference to FIGS. 9 to 18. 0]) is a casing, and in this casing 0]), a carrier 0 holder carrying a print head 0→ is slidably provided while being held by a carrier shaft (b) and a guide shaft (g). . A cover (c) is provided on the top surface of the 0th case, although only a portion thereof is shown.

The print head 02 consists of a magnet case (to) in which a plurality of electromagnets (0 to 7), which serve as driving units, are arranged in a ring and housed therein, and a plurality of (7 to
) = - Guide frame θO through which $00 is passed. A magnet portion is formed at the tips of these needles (b) in the same way as in each of the embodiments described above. The armature θυ of each electromagnet 0 is in contact with the needle (31) and is biased by the needle spring θ, so that the return position is determined by the stopper. The interior is hollow, and inside there is a needle guide ■ that aligns the tip of the zero field of the needle in a straight line and holds it so that it can slide freely, and a needle guide that holds the middle part of the needle (A) in two straight lines. Needle guides (A) which are arranged in a staggered manner and are slidably held are fixed to the needle guides (A).
(See Figures 5 and 17).

Therefore, seal portions θ and h71 are provided at two locations, the tip and the rear of the guide frame OQ, and these seal portions 0
An ink storage chamber 0→ that accommodates the magnetic ink (9) is formed between →(/4f). As shown in Fig. 14 and Fig. 16, the seal part (F) Q71 has a slit (7) through which the needle (A) passes, and five magnetic poles Q made of permanent magnets are connected to N.
The cover 6 is made of a non-magnetic material such as plastic and is opposed at the top and bottom. As shown in FIGS. 13 and 15, a passage 0 is formed between the upper and lower edges of the needle guide and the inner surface of the guide frame (41) to facilitate the passage of magnetic ink. ing.

Next, magnetic ink is applied to the upper surface of the guide frame 60).
A cartridge (goods) containing the is removably attached. A cylindrical replenishment ring is formed on the bottom surface of this cartridge (goods) and is fitted into an opening formed on the top surface of the ink storage chamber @9, and a valve G for opening and closing this replenishment ring is formed.
The cover is biased in the Q closing direction by a spring shaft and is mounted so as to be able to move up and down.

A receiving surface is formed on the guide frame 00 to support the shaft portion (A) formed on the valve Q and to retract the valve 6 in the opening direction.

The tip of the needle ( ) is opposed to the recording sheet O, which is wound around the platen O◇ and serves as a recording section.

In such a configuration, both ends of the ink storage chamber 0 are connected to the sulin)H, but the sulin)[ is a magnetic pole! A magnetic field is generated when the magnetic ink θ0 is attracted by the strength of the magnetic field and does not flow out to the outside. Since the needle Q is wet with magnetic ink ←→, a specific electromagnetic substance is excited to move the needle 00 onto the platen (if you slide it to the 6th position, the magnetic ink attached to the needle 0) will be transferred to the recording paper). Transfer to form dots. The dots are formed simply by lightly touching the recording paper I2 with the needle, and therefore printing noise can be reduced very effectively. Then, as shown in Fig. 18, the tip of the needle (G) is positioned on the surface layer of the magnetic ink (B) between the magnetic poles 09 on the tip side near the recording paper (), and from this state, the needle (A) is inserted. By directing the ink toward the recording paper, the amount of magnetic ink (magnetic ink) scattered can be limited and an appropriate print density can be achieved without smearing.

In addition, the magnetic ink (b) is exposed to the outside air between the magnetic poles 6υ, but the area is small, and even if the solvent in the magnetic ink between the magnetic poles 1) evaporates, the evaporated amount is contained in a wide ink storage space. Since the ink is replenished from the magnetic ink chamber 09, the magnetic ink between the magnetic poles 09 does not dry and solidify. Furthermore, the magnetic ink (b) is replenished from the cartridge (b) to the ink storage chamber θ field, and the level of the magnetic ink (b) in the ink storage chamber ◇ is kept constant.
It is also possible to prevent the magnetic ink (B) in I from running out and drying and solidifying from the top. In addition, since a magnetic part is formed at the tip of the needle 0, even if the same needle 0 is used repeatedly, the magnetic ink () will reliably wrap around, resulting in weak printing. There isn't.

Effects of the Invention In this invention, since a magnet is formed at the tip of the needle that is selectively driven by the drive unit as described above, magnetic ink can be rapidly poured into the needle, and the same Even if the needle is continuously driven, the amount of magnetic ink adhering to the tip of the needle does not decrease by one order, but is maintained constant and clear printing can be performed.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention, FIG. 2 is a perspective view showing the needle head and ink film forming body, FIG. 3 is a partially cutaway side view, and FIG. The figure is a plan view of the one shown in Figure 3, Figure 5 is an enlarged side view of the tip of the needle, Figure 6 is a side view showing a second embodiment of the invention, and Figure 7 is a modification thereof. 8 is a side view showing another modification, FIG. 9 is a perspective view showing a third embodiment of the invention, FIG. 1θ is a perspective view of the print head,
Fig. 11 is a plan view of the same, Fig. 12 is a partially sectional plan view of the same, Fig. 13 is a vertical side view of the same, Fig. 14 is a front view of the same, and Fig. 15 is similar to Figs. 1 and 2. 16 is a longitudinal sectional front view of the section taken along line A-A in FIG. 112, FIG. 17 is a longitudinal sectional rear view of the section taken along line C-C in FIG. 12, and FIG. FIG. 2 is an enlarged plan view of a part of the needle tip. 2... Recording paper (recording part), 11... Needle magnet (drive part), 15... Needle, 16... Tip part, 17... Magnet part, 20... Magnetic pole, 22... ...Magnetic ink, 25...Needle, 26...Tip, 2
8... Magnet (magnet part), 37... Electromagnet (drive part)
, 39... Needle, 48... Magnetic ink, 62...
...Recording paper (recording department) Applicant Tokyo Electric Co., Ltd.

Claims (1)

[Scope of Claims] 1. A plurality of needles are provided which are selectively driven by a drive unit to bring their tips into contact with a recording unit and transfer magnetic ink to the recording unit, An ink dot printer characterized in that a magnet portion is formed at an end of the tip. 2. The ink dot printer according to claim 1, wherein the magnetic poles of the magnet portion are arranged along the axial direction of the needle.