JPS6285956A - Printer head - Google Patents

Abstract

PURPOSE:To prolong the lifetime of a printer head, improve a defect of easy separation by thermal stress and improve printing quality by filling a clearance between particles of diamond adhered to a printing tip with a metal. CONSTITUTION:Powdered high-speed sintered material, cemented carbide alloy such as cermet, tungsten alloy, high-speed steel, piano wire, etc. are used as base materials for heads 2. As a means to increase a bonding strength between the base material and diamond, an intermediate coating layer of such a material as Mo, Ti, W, Cu, Au or Ag is formed. Further, Si is sometimes used as a coat to be applied to the surface of the intermediate coating layer. These layers are for facilitating diamond deposition. The preferable thickness of the intermediate coating layer is 0.01-1mum. Next, diamond particles 1 are allowed to attach to a head using, for instance, a plasma CVD method. In addition, metals 2 such as Ni, Cu or Cr are embedded in a clearance by plating. Thus it is possible to prevent diamond particles from coming off and to prolong the lifetime of the head.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to printer heads, and more particularly to diamond-coated printer heads with high wear resistance.

(Prior Art) In recent years, the proliferation of microcomputers, personal computers, word processors, etc. has been remarkable, and as a result, the number of printers associated with them is rapidly increasing. Most of the printers used are relatively inexpensive dot printers. However, as the number of prints printed on a printer increases, the number of prints increases to a huge number, and therefore the printer head wears out rapidly, and for this reason, the demand for a printer head with high wear resistance is becoming extremely strong. Conventionally, materials such as high-speed steel, cemented carbide, tungsten alloy, and piano wire have been used for the tip of the printer head, but during printing, it hits carbon paper, ink, tape, etc., causing friction due to ilZ and impact with the platen. When the number of prints is approximately 2 or 0 due to contact, the wear of the head tip portion usually reaches 50 ILim. Even if it is possible to print, it is inevitable that the print will become unclear due to head wear, and the lifespan is significantly shorter than that of a computer or word processor itself. Therefore, there is an extremely strong demand for improving the quality of printer heads by increasing the abrasion resistance of the head and extending its life.

(Problems to be Solved by the Invention) In order to achieve this objective, even in the case of the head coated with diamond, which the present inventors proposed earlier (Japanese Patent Application No. 1980-1?5fl1313), ;Due to the difference in thermal expansion between the material and diamond, it has the disadvantage that it tends to peel off due to the thermal history after coating, and a fully satisfactory result has not been obtained.

The present invention has been proposed in order to extend the relatively short service life of the printer head, which is a disadvantage of the above-mentioned prior art, and to improve the disadvantage of being easily peeled off due to thermal stress, and to improve the quality of printing.

(Means for solving problems) A diamond coating deposited on a metal substrate.

In order to maintain high hardness, precipitation must be carried out at a temperature of approximately 700°C or higher.However, when coated, diamond has a lower coefficient of thermal expansion than the base material, so a difference in thermal contraction inevitably occurs during cooling. . Therefore, cracks are likely to occur between the base material and the diamond layer.

However, when observing the progress of diamond precipitation in Omurakami such as MOlCu, it was found that there was no peeling when the diamond was precipitated in granular form.

The present invention aims to achieve the above-mentioned problems by attaching diamond particles to the leading edge of the print and filling the gaps between the particles with metal.

For example, plasma CVD (Chemical Vapo
urpeposition) ill:yo”'C+
'tk Attach diamond particles to the north of the hend. CV
When diamond is deposited using the D method, whether it becomes grains or a film depends on how the surface of the base material is treated, so granular precipitates can be obtained by devising the surface treatment.

For example, place two or more diamond grains on the end face of a dot pin.
Make scratches at 3μ intervals. Or diamond grains (150g
) can be sandblasted for about 5 seconds.

To attach diamond using the CVD method, a mixed gas of hydrocarbon gas and hydrogen gas is excited at high temperature and reduced pressure using microwaves, high frequencies, etc. to generate plasma.
By placing an object to which diamond particles are to be attached, in the case of the present invention, the tip of a printer head, in the plasma generation area, gouilland can be deposited on the head.

Microwave: 0.5-4G, 700-900°C
Conditions of 15 to 100 Torr and a concentration of hydrocarbon gas in a mixed gas of hydrocarbon and hydrogen gas of 0.1 to 5% by volume are commonly used conditions, and these conditions can also be applied to the present invention as they are.

In the present invention, diamond particles attached to the printer head of 0.5 to 1 OpLffi are sufficient to achieve the purpose.

The head base material is powdered high-speed steel sintered material, cemented carbide such as cermet, tungsten alloy, high speed steel, Piano 1Ii1
etc. are used.

The bonding strength between the base material and the diamond, along with the hardness of the diamond, is an important factor for extending the useful life of the printer head. As a means of increasing the bonding force between the base material and diamond, No.
Ti, W, Cu, Au, Ag, TiN, B C, S
A method is adopted in which diamond particles are deposited by CvD onto an intermediate coating layer such as iN, SiC, etc., or diamond particles are deposited after the intermediate coating layer is formed and further coated with Si. The reason for forming these intermediate layers is to facilitate the deposition of diamond by the CVD method, and it is empirically known that diamond is particularly easy to deposit on Si. The thickness of the intermediate layer is preferably 0.01 NI JLra.

Furthermore, metals such as Ni, Cu, and Or are added to the gaps.
Fill in with /+. This prevents diamond particles from falling off and extends the life of the head.

Next, the present invention will be explained with reference to examples.

(Example 1) The end face of a standard size dot pin made of carbide material Ne: 1 (classification code: 10) is sandblasted with diamond grains of 150mm for about 5 seconds to make scratches at intervals of 2 to 3p. .

When this pin is turned upside down and placed in a microwave plasma CvD furnace and treated at 800℃ for 2 hours, 1.5g ~ 2
Diamond grains of μ are deposited at the scratched area. Place this in a wand bath and plate the old part to a thickness of about 2 gm.

(Example 2) Approximately 10% Ti was added to the tip of a dot pin made with a piano.
0 spray coat, followed by about 500 coats of TiN.
(After preventing FeJtA scattering from the material, scratches were made in the same manner as in Example 1 to precipitate diamond particles.The next plating was impossible because TiN is an insulator, so N
The gaps between the diamond grains were filled by electroless plating of i. The thickness of Ni was approximately 2 gm.

For comparison, printer heads were made using four types of pins, including untreated dot pins, and a continuous printing test was conducted to confirm the lifespan.

Lifespan Condition after extinguishing J8 Example 1 Near X 108 times Diamonds on the periphery have fallen off Example 2: 5 x lO 8 times Diamonds on the periphery have fallen off Carbide pin-1
×103 times Piano wire pin with rounded tip: 0. IX
108th rounding of the tip (effect) As explained in detail in Section L, the printer head of the present invention, which is made by attaching diamond particles to the printing tip and filling the gaps between the particles with metal, does not allow the diamond particles to peel off during the manufacturing process. The wear amount of the head is approximately 1/10 of that of the conventional product, and therefore the useful life is improved by about 10 times, which is a very remarkable effect.

＋4 Brief Description of the Drawings FIG. 1 is a diagram illustrating the structure of a printer head according to the present invention.

1...Diamond particles 2...Full surrender #i 3...Base material

Claims (1)

[Claims] A printer head characterized in that diamond particles are attached to the printing tip and the gaps between the particles are filled with metal.