JPH05124223A - Production of wire dot printing head - Google Patents

Abstract

PURPOSE:To identify the directional property of a top or rear end of a printing wire. CONSTITUTION:In the production of a wire dot printing head consisting of an armature 4 with a printing wire 1 fixed on the top end thereof and a drive means for moving the armature 4 forward and backward, a top end part 1a or a rear end part 1b is magnetized to a predetermined magnetic pole before the printing wire is fixed to the armature, the magnetized top end part 1a or rear end part 1b of the printing wire 1 is disposed in proximity to a predetermined magnetic pole of a magnet 5, the directional property of the top or rear end is identified by the repulsion or attraction of the magnetic force, and the printing wire 1 is fixed to the armature 4.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method of manufacturing a wire dot print head.

[0002]

2. Description of the Related Art A wire dot print head prints a dot on and off based on a print signal and collides the print wire with a paper on a platen via an ink ribbon to print dots. 3, a print wire 1, a print wire guide 2 for aligning the print wire 1 by inserting the print wire 1 into a hole 2a formed at a predetermined position, and a print wire 1 moving in and out based on a print signal. And driving means 3 for driving.

As the driving means 3, for example, an electromagnet, a piezoelectric element or the like is used. The printing wire 1 is fixed to the tip of the armature 4. When the armature 4 moves in and out by the driving means 3, the printing wire 1 also moves in and out, and collides with the paper through the ink ribbon to perform dot printing. .

The print wire 1 has a diameter (D) of about 0.25 to 0.3 mmφ using a piano wire, and the diameter (d) of the tip portion is about 0.2 mmφ. The thick portion of the printing wire 1 is fixed to the tip of the armature 4 by brazing, for example.

[0005]

When fixing the print wire to the armature, the operator visually confirms the directionality of the front end and the rear end of the print wire as shown in the flowchart of FIG. .

The confirmation is not limited to mere visual inspection, but a method such as inserting the tip of the printing wire into the gauge hole to see if the insertion is possible and improving the confirmation accuracy is also used. However, since an extremely thin print wire is visually confirmed, there is often a problem that the misrecognition cannot be avoided and the direction is incorrectly fixed to the armature.

When using the gauge holes, there is a problem that the work of inserting and checking the print wires one by one into the gauge is troublesome.

[0008]

A method of manufacturing a wire dot print head according to the present invention, as shown in the explanatory view of FIG. 1, has a front end portion or a rear end portion before fixing the print wire 1 to an armature 4. The print wire 1 is magnetized so as to have a predetermined magnetic pole, and the front end or the rear end of the magnetized printing wire 1 is brought close to a predetermined magnetic pole of the magnet 5 and the directionality of the front end and the rear end of the magnet 5 is repulsed or attracted by magnetic force. After confirming the above, the armature 4 is fixed.

[0009]

Function: For example, the tip of the printing wire is magnetized so as to have the south pole, and is brought close to the north pole of the magnet.

Then, it can be confirmed that the tip is attracted by the magnet and is the tip. At this time, the rear end portion has an N pole and is repelled even when it approaches the magnet.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in the explanatory view of FIG. 1 and the flow chart of FIG. 2, a method for manufacturing a wire dot print head according to the present invention includes a front end portion or a rear end portion before fixing all print wires 1 to an armature 4. Is magnetized to have a predetermined magnetic pole, and the front end or the rear end of the magnetized printing wire 1 is brought close to a predetermined magnetic pole of the magnet 5 such as a permanent magnet or an electromagnet to repel or attract the magnetic force. Therefore, after confirming the directionality of the front end and the rear end, it is fixed to the armature 4.

That is, as described above, for example, the tip portion 1a of the printing wire 1 is magnetized so as to have the south pole, and is brought close to the north pole of the magnet 5. Then, it can be confirmed that the tip 1a is attracted by the magnet 5 and is the tip.

At this time, the rear end portion 1b has an N pole,
It can be confirmed that the rear end portion is repulsed even when the magnet 5 is close to the N pole. Alternatively, the tip portion 1a of the printing wire 1 may be magnetized to the N pole, and may be attracted by approaching the S pole of the magnet 5.
Alternatively, the magnet 5 may be brought close to the N pole to repel it.

As a result, the front end and the rear end of the printing wire 1 can be confirmed by tactilely improving the accuracy by the magnetic force, and the print wire 1 is fixed to the armature 4 with high reliability.

[0015]

According to the present invention, the accuracy of confirming the directionality of the front and rear ends of the printing wire is improved, and the improper orientation of the printing wire on the armature is reduced. Has a great effect on.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a method for confirming the directionality of a print wire in a method for manufacturing a wire dot print head according to the present invention,

FIG. 2 is a flowchart showing a method for confirming the directionality of a print wire in the method for manufacturing a wire dot print head according to the present invention,

FIG. 3 is a side view of a conventional wire dot print head,

FIG. 4 is a flowchart showing a method for confirming the directionality of a print wire in a conventional method for manufacturing a wire dot print head,

[Explanation of Codes] 1 printing wire, 3 driving means, 4 armature, 5 magnet,

Claims (1)

[Claims] 1. A method of manufacturing a wire dot print head, comprising: an armature (4) having a print wire (1) fixed to its tip; and a drive means for moving the armature (4) in and out. Before fixing the print wire (1) to the armature (4), the front end or the rear end of the print wire (1) is magnetized so as to have a predetermined magnetic pole, and the front end or the rear end of the magnetized print wire (1) is magnetized. Of the wire dot printing head characterized in that the direction of the front end and the rear end is confirmed by repulsing or attracting the magnetic force in the vicinity of a predetermined magnetic pole of the magnet (5), and fixing it to the armature (4). Production method.