JP2979791B2 - Manufacturing method of wire dot print head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a wire dot print head.

[0002]

2. Description of the Related Art A wire dot print head performs dot printing by moving a print wire in and out based on a print signal and causing the print wire to collide with a sheet of paper on a platen via an ink ribbon. As shown in the side view of FIG. 3, a printing wire 1, a printing wire guide 2 for inserting and aligning the printing wire 1 into a hole 2a drilled at a predetermined position, and moving the printing wire 1 back and forth based on a printing 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 print wire 1 is fixed to the tip of the armature 4, and the armature 4 moves in the same way by the drive means 3 to move in and out, and collides with the sheet via the ink ribbon to perform dot printing. .

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

[0005]

When the print wire is fixed to the armature, the operator performs the work of visually confirming the direction of the front and rear ends of the print wire as shown in the flowchart of FIG. .

[0006] Confirmation is not limited to simple visual inspection, and a method of improving the confirmation accuracy by inserting the tip of a print wire into a gauge hole to check whether the insertion is possible or not is adopted. However, since a very thin print wire is visually confirmed, erroneous recognition cannot be avoided and a problem often occurs that the direction is erroneously fixed to the armature.

When the gauge holes are used, there is a problem that it is troublesome to insert the printing wires one by one into the gauge and check it.

[0008]

According to the method of manufacturing a wire dot print head according to the present invention, as shown in the explanatory view of FIG. 1, the front end or the rear end is fixed before the print wire 1 is fixed to the armature 4. The leading end or the trailing end of the magnetized printing wire 1 is magnetized so as to have a predetermined magnetic pole, and the leading end or the rear end of the printing wire 1 is brought close to the predetermined magnetic pole of the magnet 5 by the repulsion or attraction of the magnetic force. Is confirmed and then fixed to the armature 4.

[0009]

For example, the printing wire is magnetized so that the leading end thereof becomes the S pole, and is brought close to the N pole of the magnet.

Then, the tip is attracted by the magnet and can be confirmed to be the tip. At this time, the rear end has the N pole, and is repelled even when approaching the magnet.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in an explanatory view of FIG. 1 and a flowchart of FIG. 2, a method of manufacturing a wire dot print head according to the present invention includes a front end or a rear end before all print wires 1 are fixed to an armature 4. The leading end or the trailing end of the magnetized printing wire 1 is brought close to a predetermined magnetic pole of a magnet 5 such as a permanent magnet or an electromagnet to repel or attract magnetic force. Thus, after confirming the directionality of the front and rear ends, the armature 4 is fixed.

That is, as described above, for example, the leading end 1a of the printing wire 1 is magnetized so as to be an S pole, and is brought close to the N pole of the magnet 5. Then, the tip 1a is attracted by the magnet 5 and can be confirmed to be the tip.

At this time, the rear end 1b has an N pole,
Even when the magnet 5 approaches the N pole, it is repelled and it can be confirmed that the magnet 5 is located at the rear end. Alternatively, the leading end 1a of the print wire 1 may be magnetized to the N pole, and may be attracted in proximity to the S pole of the magnet 5,
Alternatively, the repulsion may be performed by approaching the N pole of the magnet 5.

Accordingly, the front end and the rear end of the printing wire 1 can be checked tactilely by magnetic force with an improved accuracy, and can be fixed to the armature 4 with high reliability.

[0015]

According to the present invention, the accuracy of confirming the direction of the leading end and the trailing end of the printing wire is improved, and the possibility of erroneously fixing the printing wire to the armature is reduced. Has a great effect.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a method for confirming the directionality of a print wire in a method of 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 of 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 of confirming the directionality of a print wire by a conventional method of manufacturing a wire dot print head,

[Explanation of symbols]

 1 printing wire, 3 driving means, 4 armature, 5 magnet,

Claims (1)

(57) [Claims] 1. A method for manufacturing a wire dot print head, comprising: an armature (4) having a print wire (1) fixed to a tip thereof; and a driving means for moving the armature (4) in and out. Before fixing the printing wire (1) to the armature (4), the leading end or the trailing end is magnetized so as to have a predetermined magnetic pole, and the leading end or the trailing end of the magnetized printing wire (1). The direction of the rear end of the front end is confirmed by the repulsion or attraction of magnetic force in the vicinity of a predetermined magnetic pole of the magnet (5), and is fixed to the armature (4). Production method.