JPH02212154A - Printing head for wire dot printer - Google Patents

Abstract

PURPOSE:To raise the rigidty of a joint of fabricated assembly and to reduce noise by fabricating the wire unit assembly of a printing head for a wire dot printer and a magnet assembly through the use of mechanical means such as a screw and a spring and chemical means such as adhesives. CONSTITUTION:The wire unit assembly 201 and the magnet assembly 101 are fabricated with the screw 51 and the adhesives 402a and 402b via a spacer 401 and a residual sheet 71. Since a side yoke 21 is fixed to a yoke 1 on the entire surface with an adhesive, its joining rigidity to the yoke 1 is greater than that without using an adhesive, and does not vibrate greatly. Similarly, the assembly rigidity of the magnet assembly 101 is raised to raise the rigidity of a core 3. Consequently, vibration transmitting from a core pole 3a to the surface of a core 3 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to means for reducing noise in a print head of a wire dot printer.

[Conventional technology]

In conventional devices, for example, as described in Japanese Patent Application Laid-Open No. 62-42851 or Japanese Patent Application Laid-open No. 56-15371, the magnet assembly and wire unit assembly have only a screw or a fitting spring. The printing head itself has the disadvantage of producing a large amount of noise because it does not provide sufficient joint rigidity and does not sufficiently damp vibrations of the head components that occur when the armature and core collide.

[Problem to be solved by the invention]

The above conventional technology does not take into account the assembly rigidity of the magnet assembly and wire unit assembly, and the head components (side yokes) that occur when the armature and core collide.

There was a problem in that vibrations of the core, etc.) were difficult to damp, and the noise was large.

An object of the present invention is to provide a print head for a wire dot printer that increases the assembly rigidity of both the magnet and wire unit assemblies, reduces the vibration of the head parts that occurs when the armature and core collide, and reduces noise. It is about providing.

[Means to solve the problem]

In order to achieve the above objective, the wire unit assembly and magnet assembly of the print head of a wire dot printer are assembled using a combination of mechanical means such as screws and springs, and adhesive, etc., and the two assemblies are bonded together. The rigidity of the parts has been improved.

[Effect]

When assembling the print head magnet assembly and wire unit assembly, mechanical means such as screws and clamp springs are used together with adhesives and the like. This increases the rigidity of the print head fastening section and suppresses the vibration of the print head components that occurs when the core collides with the armature that performs printing operations, thereby reducing the noise generated from the print head. Can be done.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 4.

FIG. 1 is a sectional view of a print head for a wire dot printer according to a first embodiment of the present invention. A plurality of armatures 33 to which printing wires 35 are fixed via levers 34,
The armature assembly 301 is attached to the holder 31 by a spring 32, and the armature assembly 301 is attached to the side yoke 21. A wire unit assembly 201 is configured together with a nose plate 41 having a structure for guiding a printing wire.

On the other hand, a core 3 having a plurality of protrusions around which a coil 4 is wound at a position corresponding to each armature 33 is laminated with a permanent magnet 2 and a yoke 1 constituting a magnetic circuit, and is filled with a filler 61 inside. Magnet assembly 101 in the state
Configure. The wire unit assembly 201 and the magnet assembly 101 have a spacer 401 between them.
And, through the regular sheet 71, the screw 51
, and adhesives 402a and 402b.

The armature 33 is normally attracted to the core 3 via the regular sheet 71 by the magnetic flux of the permanent magnet 2, and the spring 32 is deflected.

When the coil 4 is energized at the printing timing, a magnetic flux is generated that cancels the magnetic flux of the permanent magnet 2, the armature 33 is released, and the spring force moves the printing wire 35 onto the printing medium (
(not shown) to perform printing. When the coil 4 is de-energized immediately before or after the print wire 35 collides with the print medium, the armature 33 absorbs the reaction force caused by the collision between the print wire 35 and the print medium and the magnetic flux of the permanent magnet 2. and collides with the core 3.

FIG. 4 is a diagram showing the propagation direction of vibration energy when the armature 33 and the core 3 collide.

The vibration energy reaches the print head surface through the core/pole portion 3a and is emitted as a sound wave, and is also transmitted from the armature 33 through the spring 32 to the holder 31, side yoke 21, . The sound propagates to the nose plate 41 and is mainly radiated from the nose plate 41 as sound.

FIG. 2 shows a side view of the side yoke 21.

Since the side yoke 21 is fixed to the yoke 1 by adhesive over the entire surface indicated by the hatched line in FIG. 1, the rigidity of the connection to the yoke 1 is higher than when no adhesive is used, and large vibrations are eliminated. For this reason, the holder 31. which is fixed to the side yoke 21 shown in FIG. The vibration of the nose plate 41 is also suppressed, and the sound pressure level of the sound radiated from the nose plate 41 can be reduced. Similarly, since the assembly rigidity of the magnet assembly 101 also increases, the rigidity of the core 3 also increases, and the core 3 from the core pole 3a increases.
Vibrations passing through the surface are also reduced.

FIG. 3 is a diagram showing another embodiment of the present invention.

Magnet assembly 101 and wire unit assembly 201 are assembled by using clamp spring 81 and adhesives 402a and 402b in place of screw 51 in the embodiment shown in FIG. operation, and
The effect is exactly the same as that of the embodiment shown in FIG. 1, and furthermore, the number of assembly steps can be reduced.

According to this embodiment, it is possible to reduce vibrations of the head components that occur during printing operations.

〔Effect of the invention〕

According to the present invention, it is possible to increase the assembly rigidity of the print head for a wire dot printer, suppress the propagation of vibrations that occur when the armature collides with the core after printing, and reduce the noise generated from the print head. can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention, FIG. 2 is a side view of the side yoke in FIG. 1, FIG. 3 is a longitudinal sectional view of another embodiment of the invention, and FIG. It is an explanatory view showing propagation of vibration from an armature and a core. 1... Yoke, 2... Permanent magnet, 3... Core, 2
1...Side yoke, 51...Screw, 81...
Clamp spring, 101... magnet assembly,
201... wire unit assembly, 301...
...Amateur assembly, 4o2...adhesive. High 1 concave Figure 3 ¥4 concave 41. 51 L+

Claims (1)

[Claims] 1. A wire unit assembly comprising a printing wire and a plurality of armatures supported by a spring, a permanent magnet, and a magnet assembly comprising a plurality of electromagnets corresponding to each armature. The armature is usually attracted to the corresponding electromagnet by the magnetic flux of the permanent magnet, and when the electromagnet is energized at the timing of printing, the armature is attracted by the magnetic flux of the permanent magnet. In a print head for a wire dot printer that performs printing by the force of a released and deflected spring, the wire unit, the assembly and the magnet
A print head for a wire dot printer, characterized in that the assembly is assembled using a combination of screws and adhesive. 2. The print head for a wire dot printer according to claim 1, wherein the wire unit assembly and the magnet assembly are assembled using a clamp spring and an adhesive. 3. The print head for a wire dot printer according to claim 1, wherein the wire unit assembly and the magnet assembly are assembled using a combination of screws and adhesive tape. 4. The print head for a wire dot printer according to claim 2, wherein an adhesive tape is used in place of the adhesive.