JPH06234224A - Wire dot printer - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a wire dot printer capable of reducing noise and vibration during printing. [Structure] An armature 12 elastically held by a leaf spring 13 is attracted by a magnetic force of a yoke core 14 and a coil 15.
In the wire dot printer in which the wire 11 is moved to perform printing by releasing the suction, the armature 12 is arranged separately from the wire 11. [Effect] Armature 12 or leaf spring 1 at the time of printing
Since the impact and vibration generated between 3 and the yoke core 14 are not transmitted to the wire 11, noise can be significantly reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire dot printer having a function of significantly reducing impact noise generated during printing.

[0002]

2. Description of the Related Art In recent years, the occupation rate of wire dot printers in the printer market has become extremely large. However, compared to inkjet and laser printers,
The wire dot printer has a drawback that the noise in printing is extremely high.

The structure of the print head of the conventional wire dot printer will be described below. FIG. 5 is a cross-sectional view of a conventional print head, 1 is a wire, 2 is an armature, 3 is a leaf spring, 4 is a yoke core, and 5 is a coil.
The armature 2 has one side brazed to the wire 1, and the back surface thereof is joined to the leaf spring 3. A coil 5 is provided on the outer peripheral portion of the yoke core 4. The yoke core 4 is formed of a permanent magnet and attracts the leaf spring 3 integrated with the wire 1 and the armature 2. Therefore, by passing a current through the coil 5, a magnetic force in the direction opposite to the permanent magnet of the yoke core 4 is generated to release the leaf spring 3,
The printing operation is performed by moving the wire 1 by the spring force of the leaf spring 3.

[0004]

However, in the above-mentioned conventional configuration, when the coil 5 is turned off, the leaf spring 3 collides with the yoke core 4 to generate impact noise and vibration, and the vibration causes the armature 2 and the vibration. There is a problem that it is transmitted to the wire 1 and resonates inside to generate a very large noise.

Therefore, it is an object of the present invention to provide a wire dot printer which can prevent the generation of noise and vibration due to the collision of the leaf spring and the yoke core during printing.

[0006]

To this end, according to the present invention, an armature that is elastically supported by a leaf spring and performs a printing operation by the magnetic force of the yoke core is provided separately from the wire.

[0007]

According to the above construction, since the armature and the wire are separated from each other, the impact or vibration generated between the armature or the leaf spring and the yoke core during the printing operation is not transmitted to the wire, so that the noise or vibration during printing is generated. Is significantly reduced.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of the wire dot printer, and FIG. 2 is a perspective view with the upper lid open. The wire dot printer 6 is constructed by mounting an upper lid 8 on the upper surface of a main body 7 so as to be openable and closable, and a print head 9 is housed inside the main body 7.

FIG. 3 is a sectional view of the print head 9. 11
Is a wire, and the armature 12 is disposed separately from the wire 11 on the rear end side. The back surface of the armature 12 is joined to the leaf spring 13 and held by it.
Behind the armature 12, a yoke core 14 that generates a magnetic force and a coil 15 located on the outer peripheral portion of the yoke core 14 are provided. Further, on the front surface of the yoke core 14, a shock absorbing material 16 for absorbing a shock of the leaf spring 13 or the armature 12 is provided.

A spring 17 is attached to the rear end of the wire 11. Spring 17 is spring holder 2
1, and a cap 20 is attached to the rear end of the wire 11. Further, between the wire 11 and the armature 12, a stopper 19 with which the spring holder 21 elastically contacts is provided. A thin protrusion 22 is provided on the back surface of the cap 20. The protrusion 22 penetrates the stopper 19 and extends toward the armature 12 side. The print head is configured as described above, and the printing operation will be described next.

The yoke core 14 is made of a permanent magnet and attracts the leaf spring 13 integrated with the armature 12. The cap 20 integrated with the wire 11 is pushed toward the armature 12 side by the spring force of the spring 17 until it hits the stopper 19. When a current is supplied to the coil 15, a magnetic flux in the direction opposite to the permanent magnet of the yoke core 14 is generated to cancel the magnetic flux, the leaf spring 13 is released, and the spring force of the leaf spring 13 causes the upper end portion of the armature 12 to cap. By striking the protrusion 22 of the wire 20, the wire 11 moves while resisting the spring force of the spring 17 to perform the printing operation.

In the above operation, since the armature 12 is separated from the cap 20, the shock and vibration generated when the leaf spring 13 is attracted by the yoke core 14 is not transmitted to the wire 11 and the armature 12 has an upper end portion. Since the fine protrusion 22 having an extremely small area is hit, almost no impact noise is generated, and the impact generated when the leaf spring 13 is attracted is absorbed by the impact absorbing material 16, so that noise and vibration are significantly generated. Will be reduced.

FIG. 4 shows another embodiment of the present invention.
The arrangement structure of the armature 12, the leaf spring 13, the yoke core 14, the coil 15, and the shock absorbing material 16 is the same as that of the above-described embodiment. The upper end of the second armature 23 is coupled to the substantially central portion of the wire 11. A stopper 24 is provided behind the second armature 23, and the second armature 23 is in the opposite direction (leftward) from the stopper 24 by the spring force of a spring 25 provided on the opposite side.
Has been raped. 26 is a spring holder.

The function of the print head structure of this embodiment constructed as described above will be described below.

The yoke core 14 is formed of a permanent magnet and attracts the leaf spring 13 which is integrated with the first armature 12. The second armature 23 integrated with the wire 11 is pressed by the spring 25 toward the first armature 12 side until it hits the stopper 24. When a current is supplied to the coil 15, a magnetic flux in the direction opposite to the permanent magnet of the yoke core 14 is generated to cancel the magnetic flux and release the leaf spring 13, and the spring force of the leaf spring 13 causes a part of the first armature 12 to move. By hitting the tip of the wire 11, the spring 25
The wire 11 moves while performing the printing operation while resisting the elastic force of.

Since the first armature 12 joined to the leaf spring 13 is separated from the wire 11, the leaf spring 13
The vibration generated when is sucked is not transmitted to the wire 11 and hits a portion of the wire 11 having a very small area with a part of the first armature 12, so that an impact sound is hardly generated. Further, the impact sound generated when the leaf spring 13 is attracted is significantly reduced by the impact absorbing material 16.

[0018]

As described above, according to the present invention, since the shock and the vibration generated between the armature or the leaf spring and the yoke coil at the time of printing are not transmitted to the wire, the noise and the vibration accompanying the printing can be remarkably reduced. Can realize a quiet wire dot printer.

[Brief description of drawings]

FIG. 1 is a perspective view of a wire dot printer according to an embodiment of the present invention.

FIG. 2 is a perspective view of an open state of the wire dot printer according to the embodiment of the present invention.

FIG. 3 is a sectional view of a print head according to an embodiment of the present invention.

FIG. 4 is a sectional view of a print head according to another embodiment of the present invention.

FIG. 5 is a sectional view of a conventional print head.

[Explanation of symbols]

 11 wire 12 armature 13 leaf spring 14 yoke core 15 coil 16 shock absorber

Claims (1)

[Claims] 1. A wire, an armature provided separately from the wire on the rear end side of the wire, a leaf spring for holding the armature, and a magnetic force provided behind the armature. A wire dot printer comprising a yoke core and a coil for sucking and releasing the armature.