JPS61252176A - Wire guide for dot printer - Google Patents

Abstract

PURPOSE:To obtain a wire guide having favorable sliding characteristics and durability, by mixing predetermined amounts of particles of an abrasion-resistant inorganic material and a solid lubricant into a synthetic resin used as a base material. CONSTITUTION:The wire guide G is formed from a material obtained by mixing an abrasion-resistant inorganic material P such as alumina, silicon carbide, zirconia and silicon nitride and a solid lubricant F into a synthetic resin S such as an epoxy resin, a phenolic resin and a polyamide resin. Various specimens were produced, and the sliding characteristics as a wire guide G and abrasion characteristics of a wall surface of a guide hole H and the wire were measured. As a result, if was found that a wire guide in which 10-60wt% of an abrasion-resistant inorganic material P having an average particle diame ter of about 2-50mum and about 1-30wt% of a graphite powder as a solid lubricant are uniformly mixed in a synthetic resin is the optimum.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a guide for movably holding a wire in a complete wire dot printer.

[Conventional technology]

Conventional wire guides are made of a molded body made of a highly hard material such as alumina ceramic or ruby, or a material made of polyethylene or epoxy resin mixed with a moisture-free material such as molybdenum disulfide, in which guide holes are drilled. was.

[Problems with conventional technology]

However, although wire guides made of alumina ceramic or ruby as described above have high wear resistance and are durable, they are also highly hard and difficult to process, resulting in high manufacturing costs. . On the other hand, those made of synthetic resin such as polyethylene or epoxy resin are relatively easy to manufacture, but because they are made of a material with low hardness, they tend to wear easily and have poor durability.

[Means for solving problems]

In view of the above, in order to utilize only the respective features of Cefmic material and synthetic resin material, we have created a material that uses synthetic resin material as a base material, and is made of an inorganic material with high wear resistance and an inorganic lubricant such as graphite. A wire guide was constructed.

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the drawings.

The figure shows a front view of a wire guide G according to the present invention, and this wire guide G is disposed approximately at the central tip of a dot printer head (not shown). Wires in columns (not shown)
A plurality of guide holes H are bored in order to align the wires and cause the tip of the wire to protrude.

The wire guide G is composed of a synthetic resin S such as an epoxy resin, a phenol/% resin, or a polyimide resin, a wear-resistant inorganic material P such as alumina, silicon carbide, zirconia, and silicon nitride, and a solid lubricant F. It is made from a mixture of materials.

By the way, among the above composite materials, a wire guide G was prototyped using a composite material made by mixing spherical fused alumina as the A-resistant material P and graphite powder as the solid lubricant F into an epoxy resin. A large number of samples with different average particles of fused alumina with different proportions of the mixture making up this composite material were manufactured, and the sliding characteristics as a wire guide G, the wear characteristics of the wall surface of the guide hole H and the wire itself were measured. However, the cefmic particles as the wear-resistant inorganic material P have an average particle size of about 2 to 50μ and contain 10 to 60% by weight, and 1 to 30% by weight of graphite powder as a solid lubricant.
It was found that a mixture uniformly mixed with the above-mentioned epoxy resin in weight percent was optimal.

In particular, such composite materials are molded using a material in which epoxy resin as a base material is mixed with 30% by weight of rounded fused alumina particles with an average particle size of 34μ and 1% by weight of graphite powder. Even after printing up to 16 to 20 million characters with Y-4 ID G, there was almost no disturbance in the characters.

On the other hand, as a comparative example, in the case of a wire guide molded from a conventional material containing gutphite in epoxy resin, even the best one showed irregularities in printing after 6 million characters.

On the other hand, when using the above-mentioned ceramic particles as the wear-resistant inorganic material P, if the average particle size is 50μ or more and it is mixed with 60% by weight or more, the molded body (wire guide) will be brittle and the strength will be reduced. No good results were obtained.

Also, even if 30% by weight or more of graphite powder is mixed in as a solid lubricant, there is no improvement in the sliding properties of the wire.
However, there was a significant tendency for strength to decrease in the molded product.

In addition, in the above example, only alumina particles were used as the ceramic particles to be mixed, but other cefmic particles such as silicon nitride, silicon carbide, zirconia, etc., with an average particle diameter of 2 to 50 μm or Almost similar characteristics were obtained when two or more types were combined or when other synthetic resins were used.

It goes without saying that the wire guide according to the present invention can be applied not only to the tip of a dot printer head, but also to a wire guide on the drive side (solenoid side) of the wire.

〔Effect of the invention〕

As described above, according to the present invention, good sliding properties and durability are achieved because the base material, synthetic resin, is molded with a material in which wear-resistant inorganic particles and graphite, which is a solid lubricant, are mixed in a predetermined amount. It is possible to provide a wire guide with excellent productivity.

[Brief explanation of drawings]

The figure is a front view of a wire guide according to an embodiment of the present invention. G: Wire guide P: Wear-resistant inorganic material S: Synthetic resin F: Solid lubricant H: Guide hole

Claims (1)

[Claims] Wire guides for dot printers are made of synthetic resin such as epoxy resin, phenol resin, polyimide resin, etc., and the average particle size is 2.
A dot characterized by being formed of a material containing 10 to 60% by weight of a wear-resistant inorganic material such as ~50μ fused alumina, silicon carbide, silicon nitride zirconia, and 1 to 30% by weight of graphite as a solid lubricant. Wire guide for printers.