JPH01241103A - Head for printer - Google Patents

Abstract

PURPOSE:To attain printing at high speed and the reduction of noises by using a member formed by joining a yoke section composed of iron silicon and a core section consisting of permendur as the magnetic path of a dot printing drive system. CONSTITUTION:The magnetic path of a dot printing drive system is made up of a yoke section 2 composed of iron silicon and a core section 1 consisting of permendur, and shaped by joining these yoke section and core section. It is preferable that the components of the core are made up of 40-55% Co, 0.5-2.5% V, 1-3% W and 0.01-0.05% C at weight% and the remainder is composed of Fe substantially at that time. That is, the core section 1, a sectional area of which is limited and magnetic flux density of which is most heightened, in the yoke-core consists of permendur having saturation magnetic flux density higher than iron silicon as the materials of conventional yokes and cores. Accordingly, the increase of magnetic flux and miniaturization are enabled, and printing at high speed and the lowering of noises required for a printing head can be satisfied sufficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a core and a yoke used in a print head of a dot printer and forming a dot print drive system magnetic path.

(Prior Art) Conventionally, the print heads in dot printers are clapper type, pallistic type, and spring charge type.

Classified as a plunger type. However, although these have different structures, they are all basically a type of electrical-to-mechanical conversion actuator using electromagnets.

FIG. 5 is a structural diagram of a typical spring-charged print head. The armature 6 is constantly attracted to the distal end surface of the core portion 1 of the yoke against the leaf spring 5 by the magnetic flux generated by the permanent magnet 4. Here, the coil 1 wound around the core part 1
When a current is applied to the core 1 to cancel the magnetic flux generated by the permanent magnet 4, the armature 6 is moved away from the tip of the core 1 by the restoring force of the leaf spring 5 attached to the armature, and the printing wire 7 fixed to the tip is moved away from the tip of the core 1. At the same time, printing is performed on printing paper 9 via a pop-out ink ribbon 8.

As shown in FIG. 4, the shape of this yoke and core is conventionally a yoke-core type in which a yoke portion 2 and a core portion 1 are integrated, and the material thereof is mainly silicon iron.

[Problem to be solved by the invention]

By the way, silicon iron has been used for the yoke core because it needs to have soft magnetic properties.

However, as printing speeds continue to increase, silicon iron sometimes falls short in terms of saturation magnetic flux density. For this purpose, it is possible to make the yoke core permend,
In this case, do it all at once.

There was a problem that it was very expensive.

Furthermore, the yoke core made of silicon iron has the problem of producing extremely loud noises during printing.

The present invention is required for printer heads. In order to achieve high-speed printing and low noise, the yoke
The object of the present invention is to provide a yoke core for a printer head that has improved core magnetic and vibration damping characteristics and can be made at low cost.

[Means to solve the problem]

The present invention provides a head for a dot printer, characterized in that the magnetic path of the dot printing drive system consists of a yoke part made of silicon iron and a core part made of permender, which are joined together. It is the head. In the present invention, the core components are Co4 (1 to 55
%, V 0.5-2.5%, W 0.1-3%, G 0.
01-0.05% and the balance is preferably substantially composed of Fe.

According to the present invention, the core portion of the yoke core, which has a limited cross-sectional area and has the highest magnetic flux density, is made of permenda, which has a higher saturation magnetic flux density than silicon iron, which is the material of the conventional yoke core. It becomes possible to increase the magnetic flux or downsize, and it is possible to improve printing speed in both cases.

In addition, the inventors of the present invention have found that noise reduction can be achieved by particularly constructing the core portion with permender. That is, as shown in FIG. 3, permenda has a damping capacity of about 10 times that of silicon iron, and is therefore very effective in reducing noise.

In addition, the yoke/core in which the core part is made of bermender in the present invention has the advantage that it can be manufactured at a lower cost without sacrificing performance compared to an integral part made of permender, and can be manufactured with higher precision than an integral part made by casting. be.

In particular, when the cross section of the core is an irregular cross section as shown in FIG. 1(b), the use of an irregular drawn wire makes it possible to obtain a highly accurate core at an extremely low cost.

The reason for limiting the core components will be explained below.

C0. ■ is the main element that composes permenda, Co is F
By forming an alloy with e, the magnetic flux density is increased, but 40
If it is less than 55% or more than 55%, the permeability will decrease.
It was set as 0 to 58.

V is known as an element that improves the workability of Fe-Co alloys. If it is less than 0.5%, it is not effective in improving workability.2.
If it exceeds 5%, the magnetic permeability of the Permenda alloy decreases, so it was set to 0.5 to 2.5%.

W and C have the effect of increasing reversible magnetic permeability (μr), but C is set to 0.01 to 0.05 because μr is small when it is less than 0.01, and the coercive force is small when it exceeds 0.05%. This is because the material becomes larger and loses its characteristics as a soft magnetic material.

W also showed similar results to C, with μr being small at 0.1%,
If it exceeds 3%, the holding power increases, so it was set to 0.1 to 3%.

Further, even if SilMn or Al is contained as a deoxidizing agent in an amount of 0.5% or less, the feature of high reversible magnetic permeability (μr) is not affected.

〔Example〕

Hereinafter, the present invention will be explained based on examples.

FIG. 1 shows an embodiment of the present invention, in which a is an overall sectional view, b is a detailed view of the core, and C is an overall plan view. First, a yoke 2 (having a side wall portion 3) made of silicon iron and a core 1- made of permender are separately manufactured. Then, a hole was provided in the yoke 2 into which the core could be inserted, and the core 1, which had been separately formed from a deformed drawn wire with a sloped base, was press-fitted and joined using an adhesive. In this example, the core 1 has an oval cross-sectional shape as shown in the same figure, and an irregularly shaped drawn wire is used. Good too. Furthermore, as shown in FIG. 2, the side walls 3 of the yoke can be similarly formed separately using permender or the like and then joined by press-fitting or the like. Although press-fitting and joining methods were used in this embodiment, the joining method may be caulking, brazing, or any other known joining method. [Effects of the Invention] According to the present invention, the printer head can be The required high-speed printing and low noise can be fully satisfied.

Furthermore, by separately forming the yoke and core, which were conventionally integrated, it is possible to satisfy the above-mentioned required characteristics and to supply the printer head at a low cost.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the yoke core according to the present invention,
(a) is a side view, (b) is a diagram showing the shape of the core, (C) is a diagram showing the planar shape of the yoke, Figure 2 is an example of a case where the yoke side wall is press-fitted, and Figure 3 is a diagram showing the shape of the yoke. A diagram showing the vibration damping characteristics of silicon iron, FIG. 4 shows a conventional yoke/core, and FIG. 5 shows an outline of a printer head. 1: Core, 2: Yoke, 3: Yoke side wall, 4: Permanent magnet, 5: Leaf spring, 6: Armature, 7: Figure 1 (°b) (C) Figure 2 '2; 7-7 Figure 3/l'-X L 57' 3 tongue medicine Figure 4 Figure 5

Claims (1)

[Claims] 1. A head for a dot printer, characterized in that the magnetic path of the dot printing drive system consists of a yoke part made of silicon iron and a core part made of permender, which are joined together. printer head. 2 The components of the core are Co40-55% and V0 in weight%.
．． 5-2.5%, W0.1-3%, C0.01-0.0
The printer head according to claim 1, characterized in that 5% and the remainder are substantially made of Fe. 3. The printer head according to claim 1 or 2, wherein the core is made of a deformed drawn material.