JPS60970A - Wire dot head - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a wire dot head that performs printing by driving a dot wire 7 using the spring force of a plate spring.

(Prior Art) Conventionally, the printing element 1, which is attached to the soi 1 food head of this scale, has its base end fixed to a yoke 2 and a free end attached to a driver, as shown in FIGS. 1 to 3. A-stety 1-stainless steel m (S U
S (7) is attached to the plate spring 4 made of S301-1-1'
A reinforcing rib 5 is ray-welded at the laser point Δ on the side where the dot wire 3 extends, and an armature 6 made of low carbon steel is welded on the opposite side at the laser point Δ (R
However, volume changes occur due to changes in crystal structure due to melting due to rake welding, and as a result,
Slight cracks may occur in the welded area, or the heat from the laser may cause
The strength of the welded part is weak because the part where the sea urchin melts as shown in J in Figure 4 and the hard melon around it deteriorates or is covered, so the welding part is weak every time the Drawers 1 to Wie 1) 3 are driven and printing is performed. The fatigue life of the welded part in response to the bending moment acting on the welded part becomes rather short, leading to breakage of the leaf spring and failure of the life head. .

In addition, the number 1 in FIG. 4 indicates Vickers hardness.

[Purpose of the invention]

This invention was made in order to deal with such conventional circumstances, and it is possible to improve the strength of the welded part without generating any holes or microcracks due to welding of the leaf spring and armature, and without reducing the hardness. The purpose is to manufacture heads for soybeans/dots 1 to 1 with strong resistance, and to provide heads for life dots 1 with fewer failures.

[Solution]

In order to achieve the above object, the present invention biases a leaf spring that is brazed to the armature and drives the soi 1 nodon 1 to hexagonal 1 to J3, which drives the Cr 13 to Cr 13. .50~1! i, 50% by weight.

N i (i, 50=J, 75 folds ff196. S i
1.00”□2,001196, (CU 0.4
0-1, 00ff317%%, Mn 1.0011
% or less, 1-i 0.20-〇, 051 hanging%, C'0
．． 09iTim% or less, P O, 040 weight! The leaf spring is characterized in that the plate spring is made of a material in which n% or less, SO, 0301 mm% or less, and the remainder m is [e].

〔Example〕

Hereinafter, embodiments embodying the present invention will be described with reference to FIGS. 5 to 8.

Figure 5 shows a side view of soi 1, hood 1 to head 7, and 8 is a frame, which is composed of a rear yoke 9 in the shape of a flat circular container and a front yoke 10 in the shape of a disc. , a permanent magnet 11 and a spanner member 12 are interposed between the rear yoke 9 and the front yoke 10.

13 is a plurality of temporary springs, for example 16 pieces, and Cr 13
．． ! +0~15.50 heavy nail%+N +6.50~7
．． 751i Q96, Si 1.00-2.00
Weight%, CuO, 40-1.00fffffi%, Mn
1,00% by weight or less, 7'i0.20~(1,65% by weight, C0,09,000% by weight or less, P 00040% by weight
Hereinafter, 3 0.030% by weight or less, the remaining amount is "e" v
Ji′i1′, tstraw solution treatment state′C has a martenley 1~ structure, and contains Si as a precipitation hardening element.

Precipitation hardening type marten υi1 that effectively utilizes Cu and Ti
It is made of ~ series stainless steel and protrudes inward from the annular base plate 14 in a 1jlrJJ shape.The base end portion of the base plate 171I is connected to the spacer member 12 and the front portion.
- It is clamped and fixed between the ribs 10. At the free end '15 of each leaf spring 13, there are a number of screws 1 to 716! <11
The parts are fixed by brazing.

In addition, 2.5% S itn (S
A no armature 18 made of UYP-82,5) is fixed, and a reinforcing rib 19 made of the same material as the temporary spring 13 is soldered on the opposite surface.

Reference numeral 20 denotes 16 electromagnet devices corresponding to each of the temporary springs 13, and these electromagnet devices 2o are provided protruding from the rear yoke 9. and an electric la winding 22 wound around the core 21.
1 is a guide frame attached to the front yoke 1°, and 16 insertion holes are formed in the center of the guide frame through which the distal ends of the driver wires 16 are inserted.

The operation of the wide V dot head constructed in this manner will be explained below.

This Wie A7 dot 1~J3 is always in the 5th
As shown by the broken line in the figure, a magnetic path is formed from the permanent magnet 11 → spacer part 12 → base plate 14 → front yoke 10 → plate spring 13 → armature 18 → core 21 → rear yoke 9.
Since the armadure 18 is attracted to the core 21 by the magnetic force of the permanent magnet 11, the leaf spring 13 is biased in the direction of the arrow as shown in FIG. 5, and stores bias energy. Then, when the electromagnetic windings 1i' and 22 of the electromagnet device 20 are energized, the electromagnet device 20 generates magnetic horns that cancel the magnetic force of the permanent magnet 11. Free end 1 of leaf spring 13
5 moves in the direction opposite to the arrow in FIG.
The wire A716 is moved in the opposite direction of the arrow, and printing is thereby performed on the printing paper (not shown). Then, when the electromagnetic winding 22 of the electromagnet j, s720 is de-energized, the free end 15 of the leaf spring 13 is again connected to the permanent magnet 11.
It is now attracted and returned to the core 21 by the magnetic force of
By repeating such operations, desired printing can be performed.

When the leaf spring 13 is bent as shown in FIGS. 5 and 6 in this manner, a large bending moment i~ is applied to the welded part of the temporary spring 13 to which the armature 18 is welded. If a plate spring material having the above-mentioned components is used for brazing, there will be no occurrence of minute cracks due to melting of the welded part, and there will be no decrease in hardness.
3 is welded part rJJ? There will be less loss.

Next, regarding the welding of the leaf spring 13 and armadure 18,
explain.

First, check the magnetic properties etc. - C1 low 1 di J fr=
ftl t' 2,5% S1 steel (SLJYP-82,
, 5) is pre-plated with an electrically eroded copper film (as a brazing material) to an appropriate thickness, and then Si and Cu are deposited as precipitation hardening elements.

T-+ @- Effectively utilized precipitation hardening martenzai 1~
A plated armature 18 is placed on a plate spring 13 made of stainless steel tF1. Then, when the plate spring 13 and the armature 18 are heated in a high-temperature furnace at a temperature of about 1130° C., the copper film plated on the armature 18 is melted. , the molten copper is filled between the leaf spring 13 and armadure 18 due to capillary action, and its cooling).
11, the leaf spring 13 and armature 18 are soldered with copper (=J). At this time, as shown in FIGS. 7 and 8, no cracks occur in the welded part, and the hardness of the welded part is (Popo I-1v including welded parts)
450), even if concentrated stress is applied to the welded part during the printing operation, the leaf spring 13 will bend at the welded part. The durability of the head becomes less and less, and the durability of the head is increased.
h is improved by more than 2 times C compared to conventional temporary spring materials and welding methods.

Although copper was used as the brazing material in the above embodiments, other brazing materials such as nickel may be used without any problem.

By the way, in another case 59), when a plate spring was formed using the precipitation hardening martensitic stainless steel of the present invention and the temporary spring and armature were ray-welded, it was found that the precipitation hardening martensitic stainless steel of the present invention was ray-welded. The fine cracks that occur in the welded parts are the same as those of conventional leaf springs)'41 (S IJ S
301-H), but it did not completely disappear (see Fig. 9), so the durability of the wire dot head did not improve much.

(Effect of original + 11J) As detailed above in 1st paragraph, this invention biases a leaf spring that is soldered to the armature, thereby driving the wire dot head from the driver 1 to the wire. Smell-
U, Or 13.50-15.50 i1i %, N
iG, 50=7.75'fj f%, S i 1
．． 00~2.00 heavy mother 961CLJ O,40~1.0
0% by weight, Mn1. OO weight% or less.

T i 0.20□-0,65 weight ff1%, C0,0
Off! below ffi%LX.

1) 0,0401ffi96 or less, SO,030
1ffi96LX lower.

Since the leaf spring is made of a material with the remaining amount of Fe, there will be no minute cracks caused by melting at the welded part of the armature of the leaf spring, and there will be no decrease in hardness. This increases the fatigue life of the welded part between the wire drive and Armadure, and reduces the chance of failure of the wire driver (~head.)
The welding area between the temporary spring and the armature becomes larger, and the absolute strength of the entire welded part can be increased, so the 1-ff effect is extremely large.

[Brief explanation of the drawing]

Figures 1 to 3 I, L are diagrams showing the laser welding points of the conventional adhesive head. Figure 4 shows the conventional plate spring and armadure welded by laser welding, and the hardness near the laser point A photograph showing the surface of the leaf spring after measurement; FIG. 5 is a cross-sectional view showing the outline of the 17-dot charge type head according to the present invention; FIG. 6 is an enlarged cross-sectional view of the main part of FIG. 5; The figure is an electron micrograph showing the state of the leaf spring and armature, Figure 8 is an enlarged electron microscope picture of Figure 7, and Figure 9 is an electron microscope picture showing the state where the leaf spring and armature are welded together by laser. This is a microscopic photograph. 7 is a wire dot head, 13 is a leaf spring, 14 is a board,
16 is a dot wire, 18 is an armature, and 19 is a reinforcing rib. Patent applicant Brother Industries, Ltd. President i+1 Katsuji Shima Figure 1 3 N Z b Figure 5 iri 6 h:n) 2 21

Claims (1)

[Scope of Claims] A wire dot head that biases a leaf spring joined to an armature by a solder and thereby drives a dot wire, comprising 13.50 to 15.50% by weight of Cr and 6.50 to 6.50% by weight of Ni.
7.75g7fi%, Si 1.00-2.00% by weight, CuO 140-1.00% by weight, Mn 1.00% by weight or less, TiO, 20-0,65iH 11%, G
O, 09i196J, 4 lower, PO, 040BQii)
Under 96LX, S O, 0301ffi% or less, and a material with a residual [e], the leaf spring was made into 41. A wire dot head that is characterized by its unique features.