JPS6025268B2 - typeface - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to typefaces used in typewriters, printers, and the like.

The typefaces conventionally used in the static impact method can be broadly classified into pallet type, cylindrical type, petal type, etc.

Particularly in recent years, petal-type typefaces have become mainstream due to their simple structure. In addition, various shapes have been devised to reduce inertia and cost. Regarding the constituent materials of these typefaces, '1' The entire typeface is molded from the same material.[2] The entire typeface is molded from the same material and only the typeface is coated with metal.{
3- There are products in which the type part and the non-type part are molded from different materials.

In the case of '1', polyacetal resin or polyamide resin reinforced with glass fiber or carbon fiber is often used as the constituent material.

Although these fiber-reinforced resins have good fatigue resistance,
In the case of POIJ acetal resin, the abrasion resistance of the typeface is inferior to that of polyamide resin. However, the latter may cause local defects on the typeface due to printing. This phenomenon occurs significantly as the printing power increases, and is a cause of deterioration in print quality and shortened lifespan of type. This phenomenon is thought to be caused by insufficient adhesion between the reinforcing material, glass fiber or carbon fiber, and the resin, and by variations in the strength of the printing surface due to the blending and dispersion of the reinforcing material. In the case of the legs, the type is usually coated with nickel, a nickel alloy, or chromium.

In this case, compared to '1, the weight and moment of inertia of the typeface increase, which further increases the cost of the typeface. Furthermore, there are drawbacks such as an increase in the moment of inertia, which leads to an increase in the cost of the entire device. In the case of [3] above, polyacetal resin or polyamide resin reinforced with glass fiber or carbon fiber is usually used except for the printed portion.

The type portion is made of phenol resin or epoxy resin reinforced with the above-mentioned fibers. In this case, since different materials are used for molding, the molding equipment and molding process become complicated, resulting in high costs. This invention aims to improve these shortcomings. By molding type bodies using polyamide resin, polypropylene resin, or polyacetal resin as a constituent material, which is a blend of fibrous inorganic material and powdered or granular inorganic material, the lifespan of the type body can be extended. Long and high printing quality.
Moreover, it provides a low cost typeface.

Experiments conducted by the present inventors show that, similar to fibrous inorganic materials, when powdered or granular inorganic or mineral materials are added to synthetic resin materials, the coefficient of thermal expansion decreases, the heat distortion temperature increases, and the compressive strength and impact strength increase. etc., the properties of the synthetic resin material are improved.

In order to apply these properties to synthetic resins for typefaces, for example, if powdered inorganic substances such as silicon dioxide and calcium oxide or mineral materials such as iron powder are blended with polyamide resin together with glass fiber, various properties of the blended resin material will be improved. The characteristics have improved dramatically. This invention was made based on the above experimental results, and in a type body having a matrix character part at one end of an arm-shaped type support, the type body containing the matrix character part is made of fiber. The typeface is characterized in that it is formed by containing powdered or granular inorganic substances and, if necessary, mineral materials in a constituent material mainly composed of polyamide resin, polypropylene resin, or polyacetal resin containing inorganic substances. This is what we provide.

As the fibrous inorganic substance, conventionally used glass fibers and carbon fibers are used, and the amount thereof is 10 to 3 parts, preferably 15 to 25 parts per 10 parts of the resin.

Next, as the powdered or granular inorganic or mineral material, silicon oxide, aluminum oxide, calcium oxide, magnesium carbonate, iron, copper, titanium oxide, etc. can be used, and silicon dioxide, aluminum oxide, calcium oxide, etc. can be used. is preferable, and it is preferable that the particle size contains 90% or more of particles having an average particle size of 2 to 10 r skin. resin 10
The blending ratio for the eaves is 10 to 35 parts, preferably 1
5 to 25 parts. Such fillers are usually mixed with synthetic resins by heating and melting, but they can also be mixed using a solvent. The fibrous inorganic material is usually treated with a silane coupling agent, but when polypropylene or polyacetal is used as the resin, it is preferably treated with a polysulfonyl azide silane coupling agent. Next, embodiments of this invention will be described.

The drawing is a plan view of an embodiment of a typeface according to the present invention. 11 is a typeface, 2 is a matrix type part, 3 is a finger part that supports the matrix type part 2, and 4 is the finger part 3.
5 is a spoke part that supports the ring part 4, 6 is a boss part that supports the entire spoke part 5, and 7 is a part for attaching a type selection motor (not shown). It is a mounting hole.

As an example, in order to obtain a typeface 1 having such a structure, polyamide resin (trade name 66 nylon) 10 anchors (weight)
A material to which 2 parts of glass fiber and 2 parts of silicon dioxide were added was injection molded. For comparison, type bodies having the same structure were injection molded using polyamide resin (trade name: nylon) to which 3 parts of glass fiber was added. Table 1 shows the characteristics of both. Table 1 * Unusable due to damage to the surface of the characters.

As is clear from Table 1, the typeface 1 according to the embodiment of the present invention has excellent bending elasticity, character compression yield strength, and the number of printed characters is 5.
Even with 00×1 characters, no defects occurred.

An improvement in the bending modulus of elasticity increases the natural frequency, which reduces vibrations generated during type selection and printing operations during printing. The natural frequencies of the materials listed in Table 1 in the illustrated shape are high, with the former having a high natural frequency of Z and 57 to 64 Hz. Reducing vibration contributes to higher speeds and improved print quality. Furthermore, the addition of silicon dioxide improves printing life by (i) improving the strength of the material (especially improving compressive strength), (ii) increasing the heat distortion temperature, making the strength of the material more uniform, and improving various other properties. This is thought to be the result.

In addition, by reducing the amount of glass fiber, the influence of the orientation of the fibers could be reduced, which was effective in improving the dimensional accuracy of the typeface, and also contributed to lower costs.
Note that a small amount of metal powder may be mixed in to increase the rigidity.
As described above, the present invention combines conventional type materials such as polyamide resins, polyacetal resins, and other synthetic resins blended with fibrous inorganic materials with powdered or granular silicon dioxide, aluminum oxide, and other materials having a grain size of 2 to 10 mounds. Since it contains 10 to 35 parts of at least one type of inorganic substance among calcium oxides, a typeface with a long life and high print quality can be obtained, and the amount of fibrous inorganic substances can be reduced compared to conventional type materials. Therefore, it is possible to improve dimensional accuracy and reduce costs. In addition, the printing life is the same as in the case of metal coating, and the manufacturing cost of type is 1/less, which is advantageous.

[Brief explanation of the drawing]

The drawing is a plan view showing the structure of a typeface showing an embodiment of the present invention. In the figure, 1 is the typeface, 2 is the matrix type part, 3 is the finger part,
4 is a ring portion, 5 is a spoke portion, 6 is a post portion, and 7 is a mounting hole.

Claims (1)

[Claims] 1. In a type body having a matrix character type part at one end of an arm-shaped type support, the entire type body including the matrix character type part is mainly made of polyamide resin, polypropylene resin, or polyacetal resin containing a fibrous inorganic substance. A typeface formed by containing 10 to 35 parts of at least one inorganic substance among powdered or granular silicon dioxide, aluminum oxide, and calcium oxide having a particle size of 2 to 10 μm in a constituent material. .