JPS5865672A - Print head - Google Patents

Abstract

PURPOSE:To reduce magnetic interference between print magnets of a print head for a wire dot printer by filling a casting agent containing magnetic agent between plural electromagnetic coils of the head. CONSTITUTION:When a current is caused to flow through a coil 2 of a pring magnet 21a of a print head 21 so that NS poles of a permanent magnet 8 become opposite to poles of a core 1, the core 1 becomes an electromagnet and acts to negate the attractive force of the permanent magnet 8 and an armature 3 is caused to fly to the side of a magnetic route 7a by the energy accumulated by a supporting spring 6 and printing is performed. As power supply to the core 2 is stopped, the electromagnetic force of the core 1 disappears, the armature 3 returns to its stand-by position as it is attracted to the core 1 by the attractive force of the magnet 8. At this time, since magnetic filler material 22 is poured and filled up between print magnets, the amount of magnetic flux affecting on the adjoining electromagnets becomes less.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a print head used in a wire tod printer, and particularly to a print head with modified magnetic properties.

Printers that form patterns such as characters by a collection of dots formed by printing wires can produce many types of characters, and are extremely suitable and economical for applications requiring copying. To improve printing quality, it is necessary to make the wires thinner and increase the number of wires so that each wire can be operated independently.

Since the use as a computer terminal is expanding, high-speed operation is required. In recent years, the 9-year-old printer print head has become smaller, faster, and consumes less power. A dot-free printing type νF is used.

To explain the conventional method with reference to Figures 1 to 1-m, the first WA is a flat diagram illustrating a wire tod printer to which the present WA is applied, and Figure 2 is a flat diagram showing a wire tod printer to which the present WA is applied. A perspective view showing the printing magnet section, Figure 3 is a side view of Figure 2,
Figure 4 is a side view to illustrate the print head according to the conventional method;
Figure 5 is between Figure 4 O Amachi Hatake A Iku's front, Figure 6 is Figure 4.
Figure OB direction arrow view *sm.

In the figure, 1.1-1 to l-3 are Tsua, 2.2-1 to 2-2
is twill, S, $-1~S-a is amachi Fujia, Sm is the holding part, 4 is the printing wire, 5 is the guide arm, Sm is the pin guide, 5b is the bottle hole, ・ is the support spring 1 piece , γb
, 7b-1 to 7b-3 are magnetic path parts, 7ζ is a side magnetic path part, 8 is a permanent magnet, 9 is a frame, 10 is a platen, 11 is a printing paper, 12m, Igb is a sprocket, 13 is a carrier, 11s is a guide shaft 7), 111 is a feeding screw, 1 is a belt, 19 is a motor, 20 is an ink ribbon cassette,
20- is an interribbon, 21 is a print head, and 21 is a hatch.

21m-1 glaze 21m-3 is a printing magnet, ■, -1 ~
1. -3 is attractive magnetic flux, I years old -1 to I, -3 is exciting magnetic flux,
I, -1, I, -3 indicate interference magnetic flux.

As shown in FIG. 1, the tweeter dot printer has seven frames 9, and a platen 10 is rotatably supported on the frame 9. Print paper 11 is placed on the platen 10.
is wrapped around it, and the printing paper 11 is wrapped around the spout
2, 12b, etc. are sent in the direction of the arrow in the figure. On the other hand, in front of Pututen 10, that is, in the lower part of the figure, there is a carrier 13.
A guide shaft 7) 12 is provided parallel to the shaft 10.
The carrier 13 is slidably fitted into the platen I, and the carrier 13 is similarly screwed into a withdrawal screw 16 provided parallel to the platen 1G. The feed screw 16 is connected to the 1-19 through the belt 17 etc.
Therefore, the feed screw 16 can be operated by moving the carrier 13 in the directions of arrows C and D in the figure by rotating the cage 19 in the forward and reverse directions. The carrier ISK is equipped with an ink ribbon cassette 2゜, and an endless ink ribbon cassette 20 is loaded with a part of it.
It is built in and exposed on the side. Also, carrier I
For SK, the print head 111 is an ink ribbon cassette 21)
Kl! The print head 21 is equipped with a plurality of printing magnetic screws (rounded) that form printing using dots. 11 are provided.

As shown in Figures 2 and 3, 1m of the printing head is wrapped with % Tomi IKI Ill 3, and Amachi IKI Ill 3 is arranged so as to touch the core IK.
A3 is equipped with a holding part 3 having a printing wire 4 fixed to its tip. Part 7
It is fixed at 1. The magnetic path sections 'Im and 'Ib are arranged in a U-shape 5, with the magnet 8 sandwiched therebetween, and surrounding the A1 and the A1 and A3 in a U-shape.

Further, a side magnetic path portion 7C that engages with the image side of the armature holder 3 with a gap protrudes from the magnetic path portion holder.

Therefore, when the printing magnet 21m is not operating, the gourd 3 is attracted to the core 1 by the magnetic force of the permanent magnet 8.

With this configuration, if current is applied to the coil 2 of the print magnet 21m of the print head 21 so that the N8 pole of the permanent magnet 8 and the A1 pole are opposite, the core 1 will become an electromagnet. ] Works to cancel the attractive force of the permanent magnet 8,
Using the energy stored by the support spring 6, the armature blower 3 flies upward in FIG.

Then, the printing wire 4 also protrudes in the direction of arrow E in the figure, and the first
The ink ribbon 20 collides with the printing paper 11 on the platen 10 shown in the figure through the ridge, and printing is performed.

When the coil 2 is de-energized, the electromagnetic force of the core 1 also disappears, and the magnet 8 moves in the direction of the arrow F in FIG. Go back to 4b. In this way, while selectively driving the plurality of printing magnets 21 within the printing head 21, the printing head 21 is moved along with the arrow C along with the arrow 13 as shown in Figure 1.
The printing operation is performed on the printing paper 11 by moving it in the D direction.

- stone printing head ZtKsP, printing magnet 21
As shown in Fig. 4, the printing wire 4 is concentrated on the right side of the center, and the printing wire 4 is guided through the pin hole 1sbK of the pin guide 5m at the tip of the guide frame S protruding from the center. Yes, and printing! Dunnett 2
The first electromagnet is Klklllllma b as shown in No. 111.
They are arranged radially.

Because they are arranged in this way, the printing magnets 21 may drive multiple printing wires 4 at the same time, but especially when adjacent wires are driven at the same time, the electromagnets may drive the printing wires 4 at the same time.
When the excitation magnetic flux of each electromagnet flows into each other, magnetic interference occurs.

This is explained in Figure 6. ★Zu, printing magnesi! When 1m-1 and 21m-2 are driven simultaneously, it's great! IO rounding: 1 il 2-1.2-t
When a K current is applied, the excitation magnetic flux I, -1, I, -2, shown by the dotted arrow line, is generated by the permanent magnet 8 shown by the arrow line, in the opposite direction to the attractive magnetic flux I, -1% I, -2, as shown by the dotted arrow line. Occur. However, the excitation magnetic fluxes I, -2 are not shown, and some of these excitation magnetic fluxes I, -1, I, -2 flow into the adjacent magnetic members, and particularly strong interference magnetic fluxes I, -2 occur in the adjacent electromagnets. ，
I becomes -1. Also, printing magnet 21m-2,21
Similarly, when m-3 is driven simultaneously, the interference magnetic flux 1. -3
, I, becomes -2. Here, the interference magnetic flux Ia-2 is not shown.

Since the direction of this magnetic flux is the same as that of the attractive magnetic flux, -1 to -3, - together act to strengthen the attractive force,
Therefore, the exciting magnetic flux 1. -1 to I, L-3 do not increase, a phenomenon occurs in which Aw f & A3-1 to 3-3 are not released, and instead of increasing the current, the driving speed of the printing wire 4 decreases, so the high The disadvantage is that it is difficult to obtain speed. Accordingly, the speed of the printer is increased (0*from the printing magnet)
It is desired to improve the magnetic properties of 21m.The object of the present invention is to solve the above-mentioned drawbacks, and to reduce magnetic interference between printing magnets, improve driving speed, and provide a circular printing head. It is in.

The present invention biases the drive spring through the armature (using a permanent Al1 stone), cancels the magnetic flux of the permanent magnet by excitation of the electric current, releases the armature, and biases the drive spring K through the armature. This is a print head characterized by being filled with a member having a plurality of printing magnets for driving a printing wire fixed to one end of a Zeng armature. This is accomplished by reducing the influence of magnetic interference.Hereinafter, an embodiment according to the present invention will be described with reference to FIGS. 7 and 8.

Fig. 7 is a side view showing an embodiment according to the present invention, Fig. 8
The figure is a diagram showing the direction of arrow γll0B'. In the figure, 22
indicates the filling magnetic material, and I-1, I, and -3' indicate the interference magnetic flux.

In addition, the same parts as in FIGS.-2 to 6II are indicated by the same reference numerals.

As shown in Figures 1 and 8, there are 21 printing magnets.
1, 21m-2, 21a-71 (Magnetic No. 2 is injected into the D-section so as not to interfere with the operation of the core 2 and the support spring 6. (shown with diagonal lines).With such a configuration, to explain the state of magnetic flux when the printing magnets 21m-1 and 21-12 are driven simultaneously, the permanent magnet 8 shown by the arrow line in the figure Attractive magnetic flux I, -1, I, -2
When the filters 2-1 and 2-2 are energized, nine excitation magnetic fluxes I, -1, I, and -2 are generated as indicated by the dotted arrow lines in the figure. Here, excitation magnetic flux 1. -2 is not shown in the figure. These excitation magnetic fluxes I, -1, I, -2 flow into the adjacent magnetic members, but the magnetic fluxes (printing madane) 21m-1e21m-
Round with filling magnetic material 22 between 20, most of the interference magnetic flux! , -1', I, -2' (I, -2' is not shown in the figure) is absorbed by this, and the magnetic flux reaching the neighboring electromagnet is small. Therefore, the interference magnetic flux I, -1 ，! .

-4 (I, -1 are not shown in the figure) will result in fewer umbrellas.

Print! DanayTh21 act-? , 21-3 are simultaneously driven.

As explained above, according to the present invention, the magnetic interference that occurs between printing magnets during simultaneous driving can be reduced, the current flowing through the electromagnetic coil can be reduced, and the operating speed of the printing head can be increased. This has the effect of increasing the speed of the printer and reducing power consumption.

[Brief explanation of the drawing]

FIG. 1 is a plan view illustrating a wire tod printer to which the present invention is applied, and FIG. 2 is a print i of the print head of FIG.
Fig. 3 is a side view of Fig. 2, Fig. 4 is a side W* illustrating the print head according to the conventional method, and Fig. 5 is a front view of the armature part O of Fig. 4. , Figure 6 is a developed view of Figure 4 in the direction of the incoming arrow, ! Fig. s7 is a side view showing an embodiment according to the actual product W14, and Fig. 8 is a developed view taken in the direction of arrow B' in Fig. 7. '1 in the figure? 1.1-1.1-2 is core%212-
1.2-2 is the fill, 3.3-1.8-2 is the amper nose, 1m is the holding part, 4 is the printing wire, 6 is the support spring, 7
m, door, 7b-1, 7b-2 - tread part, 7c side magnetic path part, 8 permanent magnet, 21m, 21m-1, 211-2 printing magnet, 22 filling magnetic material, I, -1, l5
-2 is attractive magnetic flux, I snow -1, I, -3 are exciting magnetic flux, l5
-LIa-1'*l5-3. I・−3′ indicates the interference magnetic flux・

Claims (1)

[Claims] Biasing the drive spring through the armature with a permanent magnet, the electric @
* In a print head having a plurality of printing magnets, the magnetic flux of the permanent magnet is canceled by excitation of the permanent magnet to release the armature, and the drive spring drives the printing wire fixed to one end of the armature. A figure 9 head for filling a casting agent containing Kla material between the electromagnetic coils.