JPH0585355B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wire dot printer that performs printing by striking a wire, and particularly to a wire dot printer suitable for reducing printing noise generated by striking a wire. Regarding.

[Conventional technology]

A conventional device has a structure in which the entire printer is covered with a soundproof box, as described in Japanese Utility Model Application Publication No. 191459/1983. However, since the printer is covered with a soundproof box, it becomes difficult to operate the printer, and the soundproof box also requires a large installation area.

Further, in order to reduce the noise generated from the print head itself, a cover for the print head is provided in Japanese Patent Laid-Open No. 60-27585, Japanese Patent Laid-Open No. 61-89076, and Japanese Utility Model Laid-Open No. 61-105152. Are listed.

[Problem to be solved by the invention]

The former of the above-mentioned conventional technologies has difficulty in printer operation, that is, usability, and requires a large installation area, so it is sometimes used without a soundproof box, although it is bothersome due to the printing noise of the printer. many. Furthermore, the soundproof box is large enough to cover the printer, making it expensive.

Furthermore, although the latter of the above-mentioned conventional techniques reduces the noise generated by the printing head itself, no consideration is given to the noise including the printing object.

The purpose of the present invention is to maintain the printer operation, that is, usability, in the same good condition as before, and to provide soundproofing measures, without increasing the installation area of the printer, and to make the measures inexpensive. The object of the present invention is to provide a wire dot printer with low printing noise that takes into account other noise sources, especially the noise generated by the platen.

[Means to solve the problem]

The above object is achieved by providing a cover so as to cover the tip of the print head, mounting an elastic body inside the cover, and configuring the print head to be pressed against the platen by the elastic body.

[Effect]

If no noise countermeasures are taken, the noise generated when the wire hits the platen resonates with the platen and becomes even louder. However, since the configuration is such that the platen is pressed through the printing object by an elastic body mounted inside the cover of the printing head, resonance can be attenuated and noise can be reduced.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

The print head 1 is mounted on a carrier 9. The carrier 9 has a front rail 11 and a rear rail 13.
An ink ribbon 5 is attached between the printing head 1 and the platen 3. A printing medium 7 is inserted between the ink ribbon 5 and the platen 3.

A dot printing wire 21 is connected to an armature 23 and a spring 25. A permanent magnet 31 and a core 27 are joined to the yoke 33, and an electromagnetic coil 29 is attached to the core 27.

When no current is flowing through the coil 29, the armature 23 is attracted to the core 27 by the permanent magnet 31, and the spring 27 is deflected. By passing a current through the electromagnetic coil 29, a magnetic force is generated that cancels the attractive force of the permanent magnet, the spring 25 is released, the wire 21 flies out, and printing is performed by the impact. As shown in the cross-sectional view of the conventional printing head in FIG. 4, the impact force causes the printing target 7 to vibrate because no measure is taken to suppress vibration near the impact point. However, this vibration becomes a source of noise. In FIG. 1, since the cover 35 attached to the printing head is in contact with the printing object 7, it can suppress the vibration of the printing object 7 near the impact point, and the vibration of the printing object 7 can suppress the vibration of the printing object 7. Generated noise can be reduced. Also, Figure 3 shows
Since the printing target 7 is brought into contact with the elastic body 37 attached to the inside of the cover 35, the printing target 7
The contact with the material has good adhesion and can also have a damping effect. In this way, the printing medium 7
The vibration can be suppressed elastically or with damping, and printing noise can be reduced.

〔Effect of the invention〕

According to the present invention, it is possible to suppress the vibration of the printing object and its surroundings near the impact point, so that the effect of reducing printing noise can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a printing head according to an embodiment of the present invention, FIG. 2 is a schematic diagram of a printer according to the present invention, and FIG.
This figure is a sectional view of a printing head according to another embodiment of the present invention, and FIG. 4 is a sectional view of a conventional printing head. 33...Yoke, 35...Cover, 37...Elastic body.

Claims (1)

[Claims] 1. In a wire dot printer equipped with a printing head that prints by hitting a printing medium inserted between a platen and a wire using force generated by an electromagnet and a spring, a cover is installed to cover the tip of the printing head. A wire dot printer comprising: a cover, an elastic body mounted inside the cover, and the elastic body pressing the printing target against the platen.