JPS6067169A - Printer wire for dot printer - Google Patents

Abstract

PURPOSE:To enable printing at high speed by jointing the body and tip of wire, each having its respective predetermined mechanical properties, to form a printer wire. CONSTITUTION:The boron-based light-weight less flexible body 13 of wire at 5,000kg/mm.<2> or more of modulus or proportional elasticity as Young's modulus and at 9 or less of specific gravity and the highly wear-resistant tip 11 of hardened material at 1,000HV or higher of Vicker's hardness are jointed to form a printer wire 7 at a jointing part for dot printer. It is possible to enable printing at high speed with the mechanical properties of this wire 7.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a printer wire for a dot printer.
g relates to improvements in printer wire.

[Technical background of the invention and its problems]

Dot printers are currently widely used, mainly as printers for digital dividers, but they are especially useful as printers for type 1 multi-sheet printing, and can print letters, numbers, and Japanese characters. A major feature is that any character can be printed regardless of graphics.

Here, an example of the configuration of the print head of a dot printer is as follows.
Shown in Figure 1.

That is, in FIG. 1, a cylindrical yoke 2 with a cylindrical printed wire holder 1 engaged at the center of the bottom surface has a plurality of magnetic poles protruding from the bottom surface toward the opening surface and equally spaced in the circumferential direction. 3, and a coil 4 that is independently energized is wound around each magnetic pole. Further, base ends of amateurs 5 are movably attached to the opening edge of the yoke 2 and are arranged radially with their intermediate portions facing each magnetic pole.

At the tip of each armature 5, the base end of a printed wire 7, which passes through the printed wire holder l and whose tip is exposed to a predetermined through hole 6 at the tip of the holder 1, is fixed by, for example, brazing. There is. Note that a return spring 8 engaged with the printed wire 7 is provided between the tip of each armature 5 and the opposing end surface of the holder 1. Also, holder 1
A disk-shaped stopper 10 for the armature 5 is provided on the end face of the protruding small diameter portion 9. Furthermore, notches are provided on the periphery and bottom of the cylindrical yoke, located between the magnetic poles.

When the coil 4 in the print head of the above dot printer is energized, a magnetic flux is generated in the magnetic field circuit consisting of the yoke 2 and the armature 5, and the armature 5 is attracted to the magnetic pole 3.The print stuck to the tip of the armature 5 The tip of the wire 7 is attached to the holder 1- by suction by the armature 5.
It protrudes (through the through hole 6 at the tip) and collides with a platen (not shown) via an ink ribbon (not shown) and printing paper, forming a dot on the printing paper. When the current in the coil is cut off, the printed wire 7 and the armature 5 are returned by the return spring 8 to the position where the angle is <10.

Therefore, dot printing can be performed depending on which of the predetermined print wires is overlaid.

As mentioned above, the printer wire 7 of the dot printer is
According to the suction of amateur 5 and the force of spring 8, 1
．． Printing is performed by repeating reciprocating motion at a high speed of 5kHz or higher. Therefore, as a material for printer wire, it can withstand such intense movements.

In addition, the material is highly elastic and can withstand shock during printing.

In addition, since the tip comes into repeated contact with the ink ribbon and printing paper, it is required to be made of a highly hard material that is resistant to abrasion.

The currently widely used printer wire material WC (tungsten carbide) is a hard material with a Vickers hardness of over 1500 Hv, and has good abrasion resistance and an elastic modulus of approximately 600.
It has a large weight of 0 kg/- and has quite excellent properties as a printer wire material. However, in recent years, high efficiency and high speed data processing have been considered essential, and accordingly, there has been a strong demand for higher printing speeds of printers. Additionally, in addition to the conventionally mainstream English and kana characters, printing in kanji has become widespread, and as a result, complex characters ii! Multi-g to make printing of kanji with ii clear
'i7-I) Printheads with interwires have been developed. In a print head equipped with such a large number of printer wires, the number of the above-mentioned operating mechanisms corresponding to the number of printer wires is naturally required.

Problems have arisen, such as the overall size of the board and the weight increase.

One way to increase the printing speed of the printer is to increase the force acting on the printer wire. However, in order to do so, it is necessary to increase the magnetic force that attracts the amateur, which causes the inconvenience of increasing the size of the magnetic force generation mechanism.

Therefore, one possible method for increasing the printing speed without increasing the magnetic force is to reduce the weight of the printer wire. 11 As a result of the decrease in field (m), the acceleration (α) of the printer wire increases due to the same magnetic force (f), and therefore, the rise and fall speed of the printer wire becomes faster, and as a result, the printing speed of the printer increases. This is obvious from Monoka's basic law.

By the way, even if the material is lightweight, the material with a small modulus of elasticity will warp. Therefore, a large number of deflection prevention guides are required, which not only increases the burden on the print head as a whole, but also increases the frictional resistance between the printer wire and the guides, which affects the start-up and fall speeds. No, the printing speed cannot be increased efficiently. In order to suppress such deflection during operation and increase printing speed, we need a material that is lightweight and has a high elastic modulus, that is, a material with low specific gravity and high specific elastic modulus, as well as high hardness and wear resistance. We have come to the conclusion that a printer wire that has both the characteristics of high quality and high quality is required. However, currently no material has been found that has all the properties required for printer wire and has performance superior to current materials (eg, WC), making it difficult to increase the printing speed.

[Purpose of the invention]

The present invention solves the above problems and provides a printer wire for a dot printer that can increase printing speed.

[Summary of the invention]

The printer wire of the dot printer according to the present invention is made of a wire material that is lightweight and highly elastic, that is, has a specific elastic modulus of 5000 Ky/d or more and a specific gravity of 9 or less.

Furthermore, a high hardness material is bonded to the tip of the wire.

The present invention will be explained below with reference to FIG.

As shown in cross section in Figure 2, (13) has a small specific gravity;
The wire body is made of a material with a high specific modulus of elasticity. A tip (11) made of a material with high hardness and high wear resistance is bonded to (13) at the tip of the wire.

(12) is broken at the joint.

In this way, the tip that comes into contact with the ink ribbon and printing paper is less likely to wear out, and the specific gravity of the wire body is small, making the overall printer wire lighter.The wire body also has a high specific modulus of elasticity. A useful printer wire can be obtained that has little deflection during one operation and does not require many deflection prevention guides.

The material for the wire body is W, which is currently widely used.
The specific gravity is smaller than C (WC=14), and the specific elastic modulus W
It is essential to use a material with a high C=4138 Kv'td. In particular, in order to enhance the effect, the ratio M is 9 or less, and
By using a material with a specific modulus of elasticity of 500Kμ or more, the printer wire can be made more effective in width than conventional materials. Considering the properties of the various materials shown in Table 1 and the processability of the materials, boron is an example of the most suitable material. It has a specific gravity less than one-sixth that of WC and a high specific modulus of elasticity, making it an excellent wire body material.

Table 1 Next, as candidates for materials with high hardness and high wear resistance to be bonded to the tip of the wire, for example, the materials shown in Table 2 can be considered. Although diamond has good properties, it is expensive and has some problems in terms of industrial efficiency.

Note that the joining method may be determined depending on the purpose and material properties, and suitable methods include, for example, brazing, solid phase diffusion bonding, liquid phase diffusion bonding, adhesive bonding, and the like.

Table 2 [Examples of the Invention] A printer wire for a dot printer was prepared by joining a WC having a diameter of 200 μm and a length of 5 m to the tip of a B wire with a diameter of 200 μm and a length of 75 M@ using Ni solder.

The total weight of this printer wire is approximately 77 capes, compared to the conventional W
Compared to a printer wire made of C and having the same shape, which weighs 36.6η, the weight is reduced to about one-fifth. As a result, the printing speed has been increased by more than 10% compared to the amateur printer's printing speed.

In addition, in this example, when bonding a wire and a high-hardness material, both bonding surfaces were flat, but the shape of the bonding surface may be arbitrary. For example, after drilling a hole in the high-hardness material in advance, Insert a wire into the hole and join, etc. 1
It is also appropriate to join the two parts in a manner that prevents them from collapsing.

[Brief explanation of drawings]

Figure 1 is a schematic cross-sectional view of a dot printer and print head.
FIG. 2 is a schematic cross-sectional view of a printer wire according to the present invention. 3...Magnetic pole 5...Amachia 7...Printer wire 11...High hardness material 12...Joint part 13...Wire body agent Patent attorney Kensuke Norichika ( 1 person) Figure 1 Figure 2-1.

Claims (2)

[Claims] (1) Specific elastic modulus (Young's modulus/specific gravity) is sooOKg/w
It is made of a wire material with a specific gravity of J or more and a specific gravity of 9 or less. Furthermore, a printer wire for a dot printer is characterized in that a material having a Vickers hardness of 1000 Hv or more is bonded to the tip of the wire. (2) A printer wire for a dot printer according to claim 1, wherein the wire material is boron.