JPS58208066A - Wire dot matrix printing head - Google Patents

Abstract

PURPOSE:To optimize a magnetic flux amount contributed to the attraction of an armature corresponding to the irregularity in the magnetic flux of a permanent magnet, by providing an auxiliary magnetic path containing a void in a magnet comprising a magnetic body arranged in parallel relation to the permanent magnet. CONSTITUTION:A current is supplied to a coil to generate magnetic flux in a direction reverse to that of the magnetic flux of a permanent magnet 4 and this magnetic flux is returned to the core 1 through a base 3 having the course comprising core 1 spacer 6 yoke 5 auxiliary magnetic path member 8 void 9 ferromagnetic body 9. Said auxiliary magnetic channel member 8 is clamped to the yoke 5 by a screw 21 to enable the adjustment of the void 9 which is in turn set corresponding to the degree of the irregularity in the magnetic flux of the permanent magnet 4 to adjust the leaked magnetic flux of the permanent magnet 4 and a magnetic flux amount distributed to the armature 7 and the side of the core 1 is adjusted while distributed magnetic flux by the permanent magnet 4 is optimized by inverse excitation due to the coil 2 to enhance efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention The present invention relates to a wire matrix printhead (hereinafter simply "
"Print head". ), and particularly relates to a release type print head suitable for simultaneous printing of multiple lines.

The conventional release type print head has several printing wires, a magnet for driving the printing wires, and an armature connected to the printing wire at the tip, and when not printing, the armature is attracted by a permanent magnet. During printing, the electromagnet in the magnet is magnetized to cancel the magnetic flux of the front IF'' permanent ξ stone, and the armature is made to protrude toward the printing paper side along with the printing wire due to the elasticity of the armature, thereby performing the printing operation. be.

In a release type print head, in order to improve the magnetic efficiency of the magnetic circuit, it is common that the magnetic circuit of the permanent magnet in the magnet is separated from the magnetic circuit of the electromagnetic coil, For example, Utsukai 56-
A method of providing an auxiliary magnetic path as disclosed in Japanese Patent No. 8456 is known.

However, in the method disclosed in the above-mentioned Japanese Utility Model Publication No. 56-8456, since the auxiliary magnetic path is directly connected to the permanent magnet by a magnetic material, a large amount of magnetic flux from the permanent magnet flows to the auxiliary ω path, and the original armature There was a problem in that the magnetic flux distributed to the attraction side was reduced. In addition, since the path is fixed in the sub-assistance, it is not possible to deal with variations in the magnetic flux of the permanent foundation stone, and if the magnetic flux of the permanent magnet is larger than the desired one, the Because of this, the magnetic flux of the permanent magnet cannot be canceled out, and the armature, that is, the wire, is not released, making it impossible to print and causing cracking.On the contrary, the magnetic flux of the permanent magnet decreases by the desired amount.
If Q is completed, the magnetic flux distributed to the armature suction will be 4.0 times less, resulting in the problem that the armature will not be attracted and printing will eventually become impossible.

As mentioned above, since the auxiliary magnetic path is directly connected, it not only requires a strong permanent magnet to be distributed to the auxiliary magnetic path, but also increases the size of the magnet, and furthermore, the magnetic flux of the armature attraction is optimal. There were problems such as decreased efficiency because the system was not fully integrated.

The present invention has been made in view of the above (1), and its purpose is to eliminate the above-mentioned problems in conventional print heads, and to provide a printing system with good efficiency and easy miniaturization. I have something to do.

The above-mentioned object of the present invention is to provide a mag 4.
and an armature connected to the printing wheel at its tip, which is arranged in parallel with the permanent magnet in the magnet.

We have set up an auxiliary i-inscription that includes the precepts and knee-jerk from magnetic materials,
This is achieved by a print head characterized in that the dimensions of the front V space can be changed by changing the position of the magnetic material.

Embodiment of the Invention Fig. 1 is a partial cross-sectional plan view of a flat star stamp head that is an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along the line X-X, and Fig. 3 is a view from the printing surface side. This is an iE view.

As shown in FIGS. 1 to 3, the print head of this embodiment consists of a core 1 and a coil 2. plate electromagnet group l
a, lb...11, a base 3 made of a ferromagnetic material for arranging and fixing the electromagnet group, a permanent magnet 4 fixed to this C, and a yoke 5 connected to the permanent magnet group.
, an auxiliary magnetic path member 8 made of a ferromagnetic material that is attached to provide a gap 9 between the yoke δ and the base 3 so that the gap 9 can be adjusted by m; a spacer 6 for giving a desired deflection to the armature 7 having elasticity, the armature 7 and the armature 7;
a wire 14 connected to the tip of the armature 7;
a play) 10 for controlling the stroke of the armature 7 by pressing from above the spacer 6;
It consists of a bearing 12 provided with a guide hole 13 for guiding the print head, a housing 11 holding the bearing 12, and covers 15 and 16 covering both sides of the print head.

Further, 20 indicates the center of the wire arrangement. In addition, in the electromagnet group 1 a + 1 b + . . . 11, armatures 7 and wires 14 connected to the armatures 7 are provided in a l-to-l ratio, respectively.

In the print head of this embodiment, as shown in Figure 11N2, the electromagnet group IJLtlb? ... 11 are arranged on the left and right sides of the wire arrangement center 20, and are not arranged in the direction of the wire arrangement center 20 (vertical direction in FIG. 2). This allows the print head to
7, 18 and the height dimension “T■”° to the width dimension “L I
This means that it can be made significantly smaller than +.

The operation of the print head of this embodiment will be explained below.

During non-printing, the armature 7 is attracted to the core 1 by the permanent magnet as shown in FIG.

That is, the magnetic flux of the permanent magnet 4 returns to the permanent magnet 4 through the yoke 5 -> surface = ta -> armature 7 - core l -> base 3. For this reason, the armature 7 resists elasticity and is applied to the flap 71.
& is in a pulled state. In addition, a part of the magnetic flux of the permanent magnet 4 is leaked as magnetic flux from the yoke 5 to the auxiliary magnetic path member 8 to the air gap 9.
It passes through the base 3 and returns to the permanent magnet 4.

In the printing state, the coil 2 is energized to generate a magnetic flux in the direction opposite to the direction of the magnetic flux of the permanent magnet 4, and the magnetic flux of the permanent magnet 4 is affected by the magnetic flux generated by the excitation of the coil 2. g I can climb. As a result, the armature 7, which has been attracted to the core 1, is released and moves away from the core 1 by its own spring force. As a result, the wire 14 connected to the tip of the armature protrudes from the bearing 12 to perform desired printing.

The magnetic flux generated by reverse excitation of the coil 2 is transmitted through the core 1 → armature 7 → spacer 6 → yoke 5-4 auxiliary magnetic path member 8
→Air gap 9 → Passes through base 3 and returns to core 1. The auxiliary magnetic path member 8 is fastened to the yoke 5 with a screw 21 so that the air gap 9 can be adjusted. leakage magnetic flux can be adjusted. Through this adjustment, the magnetic flux i distributed to the armature 7 and core 1 side can be adjusted, and at the same time, the balance for canceling out the magnetic flux distributed by the permanent magnet 4 by reverse excitation by the coil 2 can be optimized and efficiency can be increased.

Note that the print head shown in this embodiment has a width dimension "L I
Since the hole dimension "H" can be significantly reduced compared to +,
By arranging a plurality of these in the height direction (wire arrangement direction), it is possible to realize a printing device that can simultaneously print multiple lines in an extremely small occupied area. Also,
By arranging ink ribbons of different colors in one-to-one correspondence with the print head, it is also possible to realize a multicolor printing device capable of simultaneously printing multiple lines.

Effects of the Invention As described above, □. According to the present invention, a magnet comprising a plurality of printing wires, a permanent magnet and an electromagnet for driving the printing wires, and an armature having the printing wires connected to the tip thereof. In the open type print head, an auxiliary magnetic path including an air space is provided, which extends from the magnetic material arranged in parallel with the permanent magnet in the magnet, and by changing the position of the magnetic material, the front F air gap is Since the dimensions can be changed, the magnetic flux that provides attraction to the armature can be optimized according to variations in the magnetic flux of the permanent magnet, and leakage magnetic flux can be reduced, greatly improving efficiency. A print head can be realized.

This reduces heat generation, makes it easier to increase speed, and
It also becomes easier to configure a printing device capable of simultaneously printing multiple lines as described above.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention - h#lI flat field diagram;
Figure 2 is a cross-sectional view along the line X-X, and Figure 3 is a front view from the printing surface side.
Magnet, 3=Base, +: Mizuku magnet, 5=Yoke, 6: Spacer, 7: Armature, 8: Auxiliary magnetic path member, 9, Air gap, 12: Bearing, 14: Wire, 20: Wire array center. Patent Development Agency Hitachi, Ltd.
Patent Attorney Susuki 1) Li −゛～,. i′tJ envy −5゜″Haniku−・′

Claims (1)

[Scope of Claims] (1) An open wire matrix print head comprising a plurality of printing wires, a magnet having a permanent magnet and an electromagnet for driving the printing wires, and an armature having the printing wires connected to the tip thereof, An auxiliary magnetic path comprising a magnetic body arranged in parallel with the permanent magnet in the magnet is provided, and the dimensions of the gap can be changed by changing the position of the magnetic body. The wire matrix print head is characterized by *. (2) a magnet having a plurality of printing wires, a permanent magnet and an electromagnet for driving the printing wires, and an armour, the tip of which is connected to the printing wire; An auxiliary magnetic path consisting of a magnetic body arranged in parallel with a permanent magnet therein and including a positive number is provided so that the distance of the air gap can be changed by changing the position of the magnetic body, and
A wire matrix print head characterized in that the magnets having the auxiliary magnetic path are arranged on the left and right sides of the print element row formed by the print wire.