JPH03205159A - Wire dot print head - Google Patents

Abstract

PURPOSE:To enable a printing wire to be activated in a non-contact state and thereby prevent generation of an impact sound or abrasion by arranging an electromagnetic coil on the lateral surface of a permanent magnet through a gap so that the permanent magnet moves the printing wire in a specified direction by energization. CONSTITUTION:First an electromagnetic coil 13 is energized and then a permanent magnet 12 is moved to a position below in the figure resisting the energization of a leaf spring 14 by a mutual action between a force generated at right angles with the direction of an electric current in accordance with Fleming's rule. Next if a power supply to the electromagnetic coil 13 is shut off according to a printing signal, the magnetic field of the electromagnetic coil 13 disappears and a printing wire 7 is flipped up by the recoiling force of the comulatively energized leaf spring 14. Then dots are printed on a printing sheet through an ink ribbon. Thus a wire dot print head has no armature which collides with a stopper or becomes attracted to a core as seen in a print head based on a conventional technology. In addition, it is possible to prevent generation of an impact sound or abrasion as the printing wire 7 is activated in a non-contact state.

Description

[Detailed description of the invention] [Summary] Regarding the structure of the wire dot print head, for the purpose of reducing noise during operation and preventing functional deterioration, a permanent magnet is fixed to a movable part equipped with a print wire and energized. An electromagnetic coil is disposed on the side surface of the permanent magnet with a gap therebetween so that the permanent magnet moves the printing wire in a predetermined direction of the axial length.

[Industrial application field]

The present invention relates to the structure of a wire dot printhead.

2. Description of the Related Art In recent years, wire dot printers that form characters and the like using dots have come into widespread use as printers for various computer terminals and word processors.

These print heads are required to reduce vibration noise generated during operation and to extend their lifespan.

[Conventional technology]

For example, in the open type wire dot print head 1, as shown in the side view of FIG. By energizing the equipped electromagnetic coil 6 so as to release the armature 3, the armature 3 is caused to spring out from the plate 2.
It is configured such that it springs up under the force of , and a printing wire 7 provided at its tip performs printing.

On the other hand, in the suction type wire dot print head 8, as shown in the side view of FIG.
It has come to a halt.

Here, when the electromagnetic coil 6 wound around the core 5 is energized and the armature 9 is attracted, the printing wire 7 at the tip thereof protrudes to perform printing.

[Problem to be solved by the invention]

In the wire dot print head configured as above,
In the case of the release type, when the armature is attracted to the core, and in the case of the suction type, when the tip of the armature hits the stopper, vibration noise is generated due to the impact.

Additionally, there is a problem that wear occurs at this time, which impairs functionality.

The present invention aims to reduce vibration noise generated during operation and prevent functional deterioration.

[Means to solve the problem]

In order to achieve the above object, in the present invention, FIG.
), a movable part 1 equipped with a printing wire 7
A permanent magnet 12 is fixed to the permanent magnet 1, and an electromagnetic coil 13 is disposed on the side surface of the permanent magnet 12 with a gap therebetween so that the permanent magnet 12 moves the printing wire 7 in a predetermined direction of the axial length when energized. be.

[Effect]

The movable part equipped with a permanent magnet moves the printing wire in a predetermined direction of the axial length without contact by energizing the electromagnetic coil and by the interaction of the magnetic field with the permanent magnet.

〔Example〕

FIGS. 1 and 2 show an embodiment of the present invention.

Identical parts are designated by the same reference numerals throughout the figures.

In the present invention, the side view of FIG. 1(a) and the side view of FIG.
) As shown in the view in the direction of arrow A in FIG. 3(a) and the perspective view in FIG. The permanent magnet 1 moves the printing wire 7 in a predetermined direction of the axial length.
An electromagnetic coil (3) is disposed on the side surface of (2) with a gap in between.

The figure shows a wire dot printhead that corresponds to the open type of the prior art.

That is, the movable part 11 is a leaf spring 14 supported by a base l8, and the printing wire 7 is fixed to the tip of the leaf spring l4 via a beam l5.

Also, the plate on the opposite side to the direction in which the printing wire 7 protrudes
A block-shaped permanent magnet 12 is fixed to the surface of 4.

On both sides of the permanent magnet 12, flat electromagnetic coils 13 are erected in parallel with a small gap in between.

In printing using such a wire dot print head, first, the electromagnetic coil 13 is energized, and the force generated in the direction perpendicular to the direction of the current and the magnetic field of the permanent magnet 12 interact according to Fleming's law to cause the permanent magnet 12 to is moved and placed downward in the figure against the bias of leaf spring l4.

Next, when the power to the electromagnetic coil 13 is cut off in response to the printing signal, the magnetic field of the electromagnetic coil 13 disappears, and the printing wire 7 jumps upward due to the repulsive force of the energized leaf spring 14, and the ink ribbon (not shown) Dot printing is performed on the printing paper via the

On the other hand, in the wire dot print head corresponding to the suction type of the prior art, the movable part 11 is as shown in the side view of FIG. The plate spring 14 is similarly supported by the base l8, and the printing wire 7 is fixed to the tip of the plate spring 14 via a beam l5 downward in the figure.

Further, a permanent magnet 12 is fixed to the surface of the leaf spring l4 in the direction in which the printing wire 7 protrudes.

On both sides of the permanent magnet 12, flat electromagnetic coils 13 are erected in parallel with a small gap in between.

In printing using such a wire dot print head, the electromagnetic coil 13 is energized according to the print signal, and the mutual magnetic field with the permanent magnet 12 causes the permanent magnet 12 to move downward in the figure against the bias of the leaf spring I4. Move to.

Then, dots are printed on the printing paper using the printing wire 7 via an ink ribbon (not shown) or the like.

When the dot printing is completed and the power supply to the electromagnetic coil 13 is cut off, the printing wire 7 moves upward in the figure under the force of the leaf spring l4, and enters a standby state for the next printing.

In addition, in FIG. 1tb+ and FIG. 2(b), 17 is a magnetic shielding plate made of ferromagnetic material to prevent the magnetic flux of the electromagnetic coil 13 from leaking into the adjacent magnetic circuit. be.

Furthermore, in the above explanation, the electromagnetic coil 13 is the permanent magnet 12.
Although it is placed on both sides, it may be placed on one side.

The wire dot print head configured as described above does not have an armature that hits a stopper or sticks to a core as in the conventional technology, and the print wire 7 operates without contact, so it is possible to prevent impact noise and wear. .

〔Effect of the invention〕

The present invention has great economic and industrial effects, such as reducing noise during operation and preventing functional deterioration.

[Brief explanation of drawings]

FIG. 1(a) is a side view of the wire dot print head of the present invention, FIG. 1(b) is a view taken in the direction of arrow A in FIG. FIG. 2(a) is a side view showing another embodiment of the wire dot print head of the present invention, FIG. 2(b) is a view taken in the direction of arrow B in FIG. 2(a), and FIG. FIG. 4 is a side view of a conventional suction type wire dot print head. In the figure, 2 and 14 are leaf springs, 3 and 9 are armatures, and 4
are permanent magnets, 6 and 13 are electromagnetic coils, IO is a stopper 12 is a permanent magnet, 17 is a magnetic shielding plate, 5 is a core, 7 is a printing wire, 11 is a movable part, 15 is a beam, and 18 is a base. {lil 1 side view (c
L) (.b) No. 1 (No. 1) TL-view of Honshuaki's wire dot printing head (C) Figure 1 (No. 2) Other wire dot printing heads of Honshuaki Laughing example customer Hona side view (a) Figure 2 (1 at ℃) Same figure (8 arrow view (b) at (2)) Figure 2 (2 at) 3 Type 51 of the bacteria The side clamp of the head that hits the head + evil

Claims (1)

[Claims] A permanent magnet (
12) is fixed, and when energized, the permanent magnet (12) connects to the printing wire (7).
) in a predetermined direction of the axial length.
2) A wire dot print head characterized in that an electromagnetic coil (13) is disposed on the side surface with a gap therebetween.