JPS61164849A - Wire dot head - Google Patents

Abstract

PURPOSE:To prevent a false operation of a print wire and to make possible a high speed printing to be carried out by positioning a slit such that it is positioned between a closed magnetic circuit formed of a yoke, an auxiliary yoke, a plunger and a core and a closed magnetic circuit formed adjacent thereto. CONSTITUTION:A plunger 13 is atracted in a direction of a core 6, and an armature 14 is rotated so as to push out a printing wire 22 against a force of a return spring 10 when a current is flowed in a exciting coil 7, since a closed magnetic circuit is formed from a yoke 5, an auxiliary yoke 11, a plunger 13 and a core 6. At this time, a dot is printed on a printing blank by a printing wire 22 through an ink ribbon. A slit 24 is provided between this closed magnetic circuit and a closed magnetic circuit adjacent thereto, and it is positioned between the armatures 14, 14. A magnetic interference against an adjacent position is controlled by this slit 24 considerably.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a wire dot head.[Prior art] A wire dot head uses a plurality of excitation coils)1! !
It is configured to perform dot printing while causing the number of green/ton ears to project in response to a printing/main turn signal. Each printed wire is fixed to the armature tip,
Multi-operation is achieved by attracting a given armature with an excitation coil.

In other words, when the excitation coil is energized, a closed magnetic path is formed between the yoke, auxiliary yoke, plunger, and core, so the f2 plunger is attracted toward the core, and the armature pushes out the printed wire against the armature spring. It rotates like this. At this time, the grid/trier prints dots on the printing paper via the inkliden.

However, with the conventional structure, especially during high-speed printing operation,
There is a fear that not only a predetermined armature may be operated due to magnetic interference, but also an adjacent armature may be operated, causing the corresponding grill/tone ear to malfunction.

〔the purpose〕

SUMMARY OF THE INVENTION An object of the present invention was made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a wire dot head that prevents malfunctions of the print wire and enables high-speed printing.

[Summary]

The present invention achieves the above object by providing a slit between a closed magnetic path formed by a yoke, an auxiliary yoke, a granger, and a core, and a closed magnetic path formed adjacent to the slit. This is what I am trying to do.

〔Example〕

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

FIG. 7 is a longitudinal sectional view showing the structure of a wire dot head according to an embodiment of the present invention, and FIGS. 2 and 3 are partial front views when FIG. 7 is viewed from the arrow direction and from the arrow B direction. It is. In FIG. 1, reference numeral 1 denotes a tip guide for facilitating the work of assembling the print wire into the head main body, which will be described later, and 2 denotes a screw 23 etc. that is attached to the pack holder, which will be described later, through a positioning retaining part (not shown). This is an intermediate guide that is attached to the The intermediate guide 2 is provided with a groove 2a for a screw to be attached to a carriage (not shown), and has a KU shape for ease of attaching and detaching the head.

3 is a flexible cable for supplying current to the excitation coil of the electromagnet, which will be described later; 4 is a flexible cable that makes surface contact with the yoke of the electromagnet, which will be described later, and the pack holder; -This is a heat dissipation grate that has been developed by

In the embodiment, the thickness of the plate is approximately 2rrwn to enable sufficient conduction of heat from the yoke to the pack holder, and the material is preferably aluminum or magnesium, which has good thermal conductivity. Aluminum is used. Reference numeral 5 denotes an electromagnetic yoke, which is formed into an elliptical shape as shown in Fig. 2, and is used to equalize the sliding resistance of the print wire and prevent density unevenness between each dot formed on the printing paper. It is structured like this. 6 is a core coupled to this yoke 5), and an excitation coil 7 is wound around this core 6. Pin 8 is fitted. this? The pin 8 is provided with two terminals (not shown), and the winding start and winding end portions of the excitation coil 7 are soldered.
The book terminal is also soldered to the flexible cable 3 described above, and the excitation coil 7 is energized. Reference numeral 9 denotes a rear guide located at the center of the head body and housed in the yoke 5. One end of a restoring spring lO for returning the armature to its initial position after driving is attached to this rear guide 9. , the armature 14 is attracted and the printed wire 22
After printing the dots, the dots are restored to their initial state using the restoring blade 10 and the stopper #15. This restoration spring 10 and the stock spring 41
5 are aligned so that the movement of the armature 14 is stable.

That is, the strength of the restoring spring 100 and the hardness of the strut spring 15 are determined to enable stable movement of the armature 14), and in the embodiment, polyurethane or the like is used as the material of ing.

Further, 11 is an auxiliary yoke p arranged in parallel with the yoke 5, and 12 is an auxiliary yoke 1 that may cause problems such as wear due to rotation due to line contact with the auxiliary yoke 11 or when forming a closed magnetic path.
The auxiliary yoke 11 and the armature 1 are rounded to prevent the movement of the armature 14 from becoming unstable due to the residual magnetism of the armature 1.
4 is a spacer such as a terester film interposed between the two. A plunger 13 is fixed to the armature 14, and a print wire 22 is connected to the tip of the armature 14 by brazing. A hole (not shown) into which the retaining portion of the Devin 8 described above is fitted is provided at the end of the armature 14, and the armature 14 is configured to rotate about this retaining portion as a fulcrum.

Reference numeral 16 denotes an armature hog, which stabilizes the rotation of the armature 140 by pressing and holding the pedestal part from the rear when the armature 14 rotates. In addition, this armature holder 16 has a t
are fitted. Reference numeral 17 denotes a plate spring provided in contact with the armature holder 16. The elastic displacement of this plate spring 170 uniformly presses the armature holder 16. The casting relationship of these auxiliary yoke 11, armature 14, armature holder 16, and leaf spring 17 is as follows.
As shown in the figure. 18 is a washer 19 made of a material with high specific gravity such as lead, which is provided on the leaf spring 17. It goes up to the pack holder 21 via the spring holder 20 and is pressed and held. In addition, pack holder 2
The shape of No. 1 has a large influence on the temperature of the wire dot head, so it is preferable that the surface area is as large as possible. This da/) 418 is the leaf spring 17 and the spring tensioner 20.
By providing the structure so that it can swing freely, the vibration-proofing effect is further enhanced. Also, the washer 19 is Da 7 A
? This prevents the spring lock 20 from digging into the 19. In addition, the cylinder wires 22 are each supported by the guides 1 and 2.9 to prevent buckling, which reduces the drag force from each guide, reduces the sliding resistance of the cylinder wires 22, and improves the printing energy conversion efficiency of the electrician. It is designed to improve.

In the above configuration, when the excitation coil 7 is energized, the yoke 5. Auxiliary yoke 11. Gutu/Ja13. Since a closed magnetic path is formed by the core 6, the shoe/jar 13 is attracted toward the core 6, and the armature 14 is attracted to the restoring spring 1.
0 and rotates so as to push out the grid wire 22. At this time, the print wire 22 prints dots on the printing paper via the ink printer.

The feature of this embodiment is that, as is clear from FIGS. 2 and 3, the auxiliary yoke 11 has a yoke 5. Auxiliary yoke 11. The slit 24 is provided between one closed magnetic path formed by the granular 13° core 6 and an adjacent closed magnetic path. That is, the slit 24 is formed so as to be located between the armatures 14, as is clear from FIG. By providing such a slit 24), magnetic interference to the binding position will be slightly suppressed; for example, it is certain that the adjacent armature 14 will be moved during high-speed printing operation. and therefore the corresponding printed wire 22
The problem of ``operating'' can definitely be resolved.

In addition, in the above-mentioned nine embodiments, the structure O embodiment was shown in which the slit 24 was provided in the auxiliary yoke 11, but the slit 24 is not limited to this. It goes without saying that a configuration in which a slit is provided in the rib 5 can also provide the same effect as the above-mentioned embodiment.

〔effect〕

As explained above, according to the present invention, magnetic interference to adjacent positions can be significantly suppressed, so that the armature and its connection to the armature can be easily controlled. - Can prevent cylinder wire malfunction,
This has the effect of providing a wire dot head that enables high-speed printing.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the structure of a wire dot head according to an embodiment of the present invention, and FIGS. 2 and 3 are partial front views of FIG. 1 when viewed from the arrow direction and B direction. be. 5...Yoke, 6-e core 7...Exciting coil, 11...Auxiliary yoke, 13...
・F9 Nzoya, 14... Armature, 22... Print wire, 24... Slit.

Claims (1)

[Claims] A plurality of armatures each having a printed wire coupled to their tips and excitation coils corresponding to each armature are arranged in the circumferential direction, and each armature is driven by the excitation coil in accordance with a printing pattern signal to protrude the printed wire. In the wire dot head, a closed magnetic path is formed by a yoke arranged in parallel with the auxiliary yoke, the auxiliary yoke, a plunger fixed to the armature, and a core coupled to the yoke, and a closed magnetic path adjacent to the yoke. A wire dot head characterized by having a slit between the wire and the wire.