JPH05220981A - Printing pin - Google Patents

Abstract

PURPOSE:To reduce the cost of a printing pin without damaging the abrasion resistance, impart resistance and chemical resistance thereof by processing a material into the shape of the printing pin and subsequently applying a platinum alloy membrane to the surface of the material at least at the place coming into contact with paper or an ink ribbon by plating treatment. CONSTITUTION:A membrane composed of platinum alloy is formed on the surface of a printing pin 3 composed of a proper material at the place coming into contact with paper or an ink ribbon of said pin by plating treatment to form a plating film 31. Herein, plating treatment is applied only to the place coming into contact with the paper or ink ribbon of the printing pin 3 but can be applied to the whole thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a print pin, and more particularly to a print pin for a dot impact printer.

[0002]

2. Description of the Related Art A conventional printing pin having a spring charge type printing mechanism section sends a pulse signal to a magnetic circuit to vibrate a leaf spring, and the vibration causes the printing pin fixed to the leaf spring to print ink. It was printing on the paper through the ribbon.

FIG. 2 is a cross-sectional view of a printing mechanism section showing an example of the conventional art. The printing mechanism unit includes a paper 8 to be printed, a platen 7 that holds and moves the paper, an ink ribbon 9 that prints on the paper, and a print pin that hits the platen 7 and prints on the paper 8 through the ink ribbon 9. 5 and printing pin 5
Spring 4 for fixing the end of the hammer to the end, and the lower yoke 3 having the other end of the hammer spring 4 fixed to the side surface of the end.
A permanent magnet 1 which is attached to the other end of the lower yoke 3 and constitutes a magnetic circuit; and an upper yoke 2 whose end is attached to the permanent magnet 1 so as to face the lower yoke 3 across the permanent magnet 1. The coil 6 is attached to the other end of the upper yoke 2. If no current is passed through the coil 6, the hammer spring 4 is attracted to the permanent magnet 1 via the upper yoke 2.

FIG. 3 is an enlarged side view of the print pin fixed to the hammer spring. Since the print pin 5 is constantly in contact with the paper 8 and the ink ribbon 9, friction of the paper,
The ink ribbon is worn due to chemical properties, vibration of the hammer spring 4, collision, and the like. When the printing operation is performed with the worn printing pin 5, the printing dot mark is likely to come off, and trouble such as fading is likely to occur. In order to prevent this, a platinum alloy having abrasion resistance, impact resistance, and chemical resistance is additionally welded to the tip portion 13 of the print pin 5 that strikes the paper 8 and the excess portion is polished in a later step. ing.

Next, the operation of the conventional example will be described with reference to the drawings. Pulsed current to coil 6 with arbitrary width (time)
Is intermittently turned on, and a reverse magnetic field is applied to the magnetic circuit to set the magnetic force to "0". By this operation, the hammer spring 4 that has been attracted to the upper yoke 2 pops out due to the spring property of the material and the intermittent pulse current,
By this ejecting force, printing is performed on the paper 8 via the ink ribbon 9.

[0006]

The above-mentioned conventional printing pin has a problem that considerable know-how is required because the welding and polishing of the platinum alloy are technically unique.

Further, there is also a problem that a considerable processing time is required as a part.

Further, since the platinum alloy is used, there is a problem in that the price becomes considerably expensive.

[0009]

The printing pin of the present invention is a printing pin for a dot impact printer, which is formed at least at a portion of the surface of the material which comes into contact with a paper or an ink ribbon after the material is processed into the shape of the printing pin. A platinum alloy is plated into a thin film.

[0010]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is an enlarged side view showing an embodiment of the present invention. The print pin shown in FIG. 1 has a configuration in which the print pin 5 of the conventional example shown in FIG. 3 is replaced. The printing pin 3 is
The material is processed into the shape of the printing pin 3. A platinum alloy is plated in a thin film on a portion of the surface of the material that comes into contact with a paper or an ink ribbon, and a plating film 31 is formed to complete the printing pin 3.

It should be noted that in the present invention, the plating process is performed only on the printing pin 3 where it contacts the paper or the ink ribbon, but the entire printing pin 3 can be plated.

[0013]

As described above, the present invention has the effect of reducing the price without impairing the abrasion resistance, the impact resistance, and the chemical resistance by plating the printing pin with platinum.

Further, there is an effect that the processing time can be shortened.

[Brief description of drawings]

FIG. 1 is an enlarged side view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a printing mechanism unit showing an example of the related art.

FIG. 3 is an enlarged side view of a printing pin fixed to a hammer spring.

[Explanation of symbols]

 3 Printing pin 31 Plating film

Claims (1)

[Claims] 1. In a print pin of a dot impact printer, a material is processed into the shape of the print pin, and then a platinum alloy is plated in a thin film on at least a portion of the surface of the material that comes into contact with a paper or an ink ribbon. And print pin.