JPS604074A - Dot printer - Google Patents

Abstract

PURPOSE:To contrive to reduce printing noise, by a method wherein a needle for transferring an attracted magnetic ink onto a recording paper is slidden so as not to make contact with the paper, and is abruptly stopped so that the magnetic ink adhered to the tip of the needle is transferred onto the paper under the inertia thereof. CONSTITUTION:When an electric current is passed to a magnetic ink attracting coil 18, a magnetic ink 26 contained in an ink tank 22 is attracted by a magnetic flux generated between magnetic poles 21, and the tip of the needle 9 is wetted with the ink 26. When a specified electromagnet 7 is excited, the needle 9 is slidden together with an armature 11 to approach the recording paper 36, and when the needle 9 is abruptly stopped due to the collision of the armature 11 against an attracting surface 15, the ink 26 adhered to the tip of the needle 9 is transferred onto the paper 36 under the inertia thereof, thereby forming a dot. Accordingly, since the needle 9 does not impact on the paper 36 or a magnetic pole 37, printing noise can be reduced.

Description

[Detailed description of the invention] Technical field of invention This invention relates to a dot printer.

Technical background of the invention and its problems Conventional dot printers impact a needle on a platen using an electromagnetic armature and print on pressure-sensitive paper along the front of the platen, or press ink from an ink ribbon onto plain paper to print. It is something to do. In any case, move the needle back to the platen) -c? The impact sound is high due to the impact.

Recently, magnetic ink is placed opposite to the front surface of the recording paper, and between these magnetic poles the magnetic ink of the same ink tank is sucked up by the magnetic force, and a needle ri is used that penetrates the sucked up magnetic ink layer.
The seal is brought into contact with the e-paper, thereby weakening the pressure of the stamp against the recording paper and reducing printing noise to a certain extent.

Purpose of the Invention The present invention has been made based on these advantages, and an object thereof is to provide a dot printer that can print without bringing the needle into contact with recording paper, and can therefore significantly reduce printing noise. That is.

Summary of the Invention This invention attracts magnetic ink in an ink tank between opposing magnetic poles and transfers this magnetic ink onto recording paper with a needle, but limits the stroke of the needle so that it does not touch the recording paper. 1. Slide the needle toward the recording paper and stop suddenly. The inertia of the needle at this time causes the magnetic ink attached to the tip of the needle to be transferred onto the recording paper, thus significantly reducing printing noise.

Examples of the invention An embodiment of the present invention will be described based on the drawings.

The housing (1) has a carrier (
3) is the carrier shaft (4) and guide shaft (5)
It is held in and slidably provided. Housing (
A cover (6) is provided on the top surface of the case, although only a portion thereof is shown. The print head (2) consists of a magnet case (8) containing a plurality of electromagnets (7) arranged in an annular shape and a guide frame α1 holding a plurality of needles (9). The armature αυ of each electromagnet (7) is the needle (9
) and is urged in the return direction by a needle spring (6) and pressed against the back stopper C1l. This armature (Lυ) is attracted to the core Q4 from the return position in contact with the backstop collar Q3, but its stroke is determined by the contact with the suction surface (lS) of the core a4, and the needle fixed to the armature I The stroke of the needle (9) is determined so as not to contact the recording paper (to be described later).The guide frame QQ has a needle guide (161a) for aligning the needles (9).
? ) is fixed, magnetic plates 4 connected to both poles of the magnetic ink suction coil barrel are fixed on both sides of this guide frame (1G), and slits (2
Magnetic poles eυ facing each other with 1 in between are formed continuously, and the tip of the needle (9) protrudes from the slit.

Further, a flat ink tank 4 and a cartridge (2) are detachably attached to the print head (2).

The top surface of the ink tank (2) has a small slit-like hole (to) into which the lower end of the magnetic pole (2J) is inserted, and a through hole (to) located in the center.
c) are formed continuously, and an opening surface for replenishing magnetic ink (7) is formed. Inquitan 1riQ
A permanent magnet (to) facing the lower end of a@shi υ is fixed on the lower surface. A cylinder (2) that fits into the opening (2) is formed on the lower surface of the cartridge (C), and an opening (2) at the lower end of the cylinder (2) for discharging the magnetic ink inside.
) is formed, and an opening 0I is formed inside the tube (to) when it is in close contact.
A stopcock S for closing the is urged downward by a spring C and fitted so as to be movable up and down. Also, this orange 131
) is formed with a protruding bar on the lower surface, and a plurality of notches are formed on the outer periphery. The radius of the circle connecting the bottoms of these notches also increases the radius of the opening.

Furthermore, a paper feed roller Ct is provided in front of the print head (2).
A recording paper (3e) is provided to be fed by 51.

In such a configuration, one coil of magnetic ink suction bow tt
When electricity is applied to S, the magnetic flux generated between the magnetic poles 09 causes the AA ink (4) in the ink tank (2) to
) is sucked in, and -$1 (9) tip crab magnetic ink (
7) Get wet. Then, when the specified electromagnet (7) is excited, the needle (9) slides along with the amateur housing.
Then, as shown in Figure 6, the amateur Uυ approaches the recording paper (to) and the needle (9) comes into contact with the suction wire (9).
When the force E suddenly stops, the magnetic ink (7) adhering to the tip of the needle (9) is transferred by inertia to the recording paper (to) to form a dot as shown in FIG. 6(O). Therefore, the needle (9) does not touch the recording paper (to) or the magnetic pole (37), and printing noise can be significantly reduced.

In addition, the magnetic force of the magnetic ink attraction coil 4 is constant, and the magnetic ink (4) in the ink tank 4 is replenished from the cartridge (c) according to the amount consumed, so it is maintained at a constant level. The level of the magnetic ink layer in ) is also constant, and there is no situation where the magnetic ink does not reach the upper needle (9). Furthermore, due to the presence of the cartridge, there is no need to manually replenish the tank (24), which saves time and effort.

At the end of printing, the power to the attraction coil 4 in the magnetic ink is cut off, but the magnetic ink (4) is i a 0 due to the tension on the two sides.
Even for items that are prone to power outages between 111 and 111, permanent magnets (with a weak force)
The ink is collected into the ink tank @ by the force of c).

Effects of the Invention Since the present invention is constructed as described above, the magnetic ink attracted between the magnetic poles is transferred from the needle to the recording paper. It is possible to transfer magnetic ink onto recording paper, and therefore has the effect of significantly reducing printing noise.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a perspective view showing the overall configuration with a reduced size and a part cut away, FIG. 2 is a plan view, FIG. 3 is a vertical side view, and FIG. 4 is an exploded perspective view, FIG. 5 is an enlarged front view with a portion cut out and showing the state in which the magnetic pole is inserted into the ink tank, and FIG. be. 9... Needle, 1B... Magnetic ink suction coil,
20...Slit, 21...Magnetic pole, 22...Tank inside, 26...Magnetic inside, 36...Recording paper and Z diagram 5 countries

Claims (1)

[Claims] A magnetic ink suction coil is magnetically coupled with seven opposing magnetic poles with slits formed in each other. A plurality of needles that capture the magnetic ink attracted between the magnetic poles and transfer it to the recording paper are slidably provided between the magnetic poles, and these needles are arranged so that the needles approach the recording paper in a non-contact state. A dot printer characterized in that a stroke is determined so that when the needles suddenly stop, the magnetic ink at the tips of the needles is transferred to the recording paper by inertia.