JPS5928848Y2 - wire for dot printer - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a wire for a dot printer.

The printing mechanism of a conventional dot printer is constructed as shown in FIG.

That is, in the figure, 1 is a wire, and a guide pipe 2
and is slidably supported by a wire bearing 3.

A wire button 4 is fixed to one end of the wire 1, and a return spring 5 is elastically loaded between the wire button 4 and the spring receiver 6.

An armature γ is arranged on the side of the wire button 4, and is excited by an excitation coil 8 and attracted by an iron core 9.

One end of this armature l is extended to the rear end of the wire button 4, and the other end is in contact with the return spring 10 elastically loaded between the spring receiver 11 (when the -1 iron core 9 is not energized) , one end of the armature 1 is energized in a direction away from the wire button 4.

Therefore, when the excitation coil 8 is energized, the armature I is attracted to the iron core 9, hits the wire button 4 with an impact, pushes out the wire 1, and prints.

The wire for dot printers having the above-mentioned structure is required to have excellent abrasion resistance and impact resistance in order to ensure high-speed and reliable printing operation and withstand long-term use.

In order to improve the print quality, especially when printing Chinese characters, the smaller the dot diameter, the better, and therefore the wire diameter will inevitably become smaller.

However, as the diameter of the wire becomes thinner, the rigidity of the wire decreases, causing buckling, and elastic vibrations in the longitudinal direction of the wire also appear more strongly, causing printing energy to be lost in a larger amount, resulting in a decrease in printing energy.

In addition, since the diameter of the wire is small and the mass of the wire is also small, it is necessary to increase the wire movement speed in order to provide the necessary printing energy, which imposes a large burden on the size, current, voltage, etc. of the drive magnet. However, it has many disadvantages as a printer that requires high speed, small size, high print quality, and economical efficiency.

Also, as in Japanese Patent Publication No. 52-22564, the wire is not straight but has a bending point, and the rear end of the wire extends in a direction perpendicular to the direction of wire movement and is shaped like a coiled spring.
There is one in which the coil spring is fitted into a drive lever driven by an electromagnet.

This is an attempt to prevent the wire from being damaged by elastically deforming the bent part and the upper winding part of the coil spring when the wire impacts the printed area, but damage may occur in the upper winding part of the coil spring. In order to prevent this, the coil spring part and a part of the wire must be covered with a plastic material. There were drawbacks.

This invention eliminates the above-mentioned drawbacks and will be described in detail below with reference to the drawings.

Figure 2 shows an embodiment of this invention, in which a straight wire 2
The end portion of the wire 1A is tightly wound into a coil having a center axis that coincides with the center axis of the straight wire to form a coil portion 21B, which is a wire 21 for a dot printer.

By providing the coil portion 21B, the mass of the dot printer wire 21 can be increased even if the wire diameter is reduced, and therefore a large amount of printing energy can be obtained.

When the wire diameter is reduced, the bending rigidity is reduced, but because a part of the wire is tightly wound into a coil, the length of the straight portion 21A is smaller than the length of the conventional wire 1 shown in FIG. Since it is short, the resistance to bending of the straight portion 21A is large, and the buckling stress is also small, so there is no fear of buckling.

In addition, since the coil portion 21B is tightly wound, there is no spring action against impact in the axial direction, and the straight portion 21A is short and difficult to bend. There is also less energy loss.

Furthermore, the straight part 21A and the coil part 21B are configured so that their center axes coincide (because the straight part 21A and the coil part 21B are aligned), the straight part 21A and the coil part 21B are
It is possible to prevent the impact end face of A from sliding on the printing surface and impairing the quality of printing, and also prevent the wire end face from being worn out.

This wire for dot printers can be manufactured simply by winding one end of a straight wire tightly into a coil.

FIG. 3 is an explanatory diagram of a drive unit using the dot printer wire 21 shown in FIG.
You can use exactly the same thing as the conventional example shown in the figure.

In addition, since the straight portion 21A is short, the guide pipe 2 of the conventional example
There is an advantage to omitting this.

Generally, the diameter of the dot wire is less than O04, and functionally, this wire can be regarded as a kind of straight wire.

For this reason, the wire must have high fatigue strength and excellent wear resistance.

The material of the dot printer wire 21 may be copper alloy, stainless steel, cobalt-based alloy, iron-cobalt-vanadium alloy, carbon steel, etc., which can be plastically worked, but if a wire with a Pinkers hardness of 400 or more is used. Get enough fatigue strength.

Further, in order to improve the wear resistance of the dot printer wire 21 during use, it is possible to solve the problem by subjecting the wire to nitriding treatment, solution treatment, and further (processing soldering, plating, etc.).

As described above, according to this invention, the wire for dot printers has a simple structure in which a coil part is tightly wound at one end of the straight wire and whose central axis coincides with the central axis of the straight line, and the wire diameter can be increased. Even if it is made thinner, it has the advantage of increasing the mass to prevent a decrease in printing energy, increasing the buckling resistance of the dot printer wire, and improving printing quality.

[Brief explanation of the drawing]

Fig. 1 is a diagram explaining a conventional wire 1 drive unit for a dot printer, Fig. 2 is a side view showing an embodiment of this invention, and Fig. 3 is a 1 drive unit using the wire for a dot printer shown in Fig. 2. FIG. In the figure, 21 is a dot printer wire, 21A is a straight wire, and 21B is a coil portion.

Claims (1)

[Scope of utility model registration request] 1. A wire for a dot printer, characterized in that one end of a straight wire is wound tightly into a coil shape with its center axis aligned with the center axis of the straight wire.