JPS63107564A - Spring-energized type dot printer head - Google Patents

Abstract

PURPOSE:To obtain a stabilized printing density operating at a low current, by using brittle material such as Si3N4, CaTiO3, PaTiO3, Al2O3-TiC as a spring keep plate constituting a printer head. CONSTITUTION:One unit A constituting a printer head is processed in such manner as to be flush with the respective end surfaces of a stopper 2 and a coil core 3 with the apex surface 7a of a yoke 7 as a reference. The other unit B to be connected and fixed with the upper surface of the yoke 7 is constituted of a side yoke 8, a plate spring 10 to be laminated thereon via a spacer 9 and a spring keep plate 16 which presses said plate 10 from above. After the completion of a state wherein, a plate spring is imparted with a required flexibility and a wire lever 12 is attracted to a coil core 3, the entire body is ground in the manner that the tip end of a plunger 14 and that of the projection 13 of the wire lever 12 are made flush with each other with the under surface 8a of the side yoke 8 as a reference. As a material for the keep spring plate 16 constituting a printing head, a brittle one such as Si3N4, CaTiO3, BaTiO3, Al2O3-TiC and the like is preferably used. Thereby, a head unit can obtain rigidity, and almost no deformation appears even after the processing of the unit.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a structure of a spring-charged dot printer head.

[Conventional technology]

Conventionally, in a spring-charged dot printer head, the head uses a permanent magnet to constantly attract and hold a wire lever on a coil core against a spring, and when printing, the coil is energized to release the attractive force of the permanent magnet and release the lever. The material of the laminated parts that make up the platen is different from the material used to print by hitting the wire onto the platen surface.

The structure used a soft magnetic material (pure iron, Si steel, etc.) for the magnetic path part, and an easy-to-process metal (5poa, SA material, etc.), moss, plastic, etc. for the reinforcing part.

Further, the head structure unit is divided into two parts.

(Hereinafter, the coil [fB stone side] side will be referred to as the A unit.

(The wire lever side is called the B unit) [Problem to be solved by the invention] However, in the prior art described in KtI, the B unit has a rigidity h.
Without Z, individual parallel distance t1μm of B unit constituent parts
Even with the following precautions, the B unit was deformed by more than 10 μm when assembled, and this had a large effect on determining the neutral stroke during printer head operation.

Also, with the wire lever being flexed to a certain degree.

There is also a pre/targe blade that is ground so that the end face of the plunger is on the same plane as the horizontal plane that includes the end face of the coil core, so that both sides are always in surface contact. From, machining strain, grinding resistance ht
The resulting B unit is made thicker, and the amount of spring insertion is uneven. The punching force of the wire is determined by the reaction force of the spring. If the amount of deflection of the sinking spring varies, the punching force will also cause the printing density to become uniform and some pins will not print. As a result, when the ilil is healthy, a large amount of current is required, resulting in a problem of high current consumption and an increase in the cost of the electric circuit section. Therefore, the present invention aims to solve these problems, and its purpose is to:
Eliminates the deficiencies of conventional technology.

It offers low cost, low current, and stable printing quality.

[Elaborate means to solve problems]

In the spring-charged dot printer head of the present invention, the head is made of a hard brittle material (5isy+, aari a
s, Bartos, pr*os-TC, etc.).

〔Example〕

The details of the present invention will be demonstrated below based on examples.

FIG. 1 shows an embodiment of the present invention, in which one unit A#-t constituting a printer head, a cover 1 with a center bar 2 protruding from an elastic material such as rubber, A large number of coil cores 3 are installed on the next core base 5. The annular permanent magnet 6 and the annular yoke 7 are constructed as a sequential stacking unit, and as shown in FIG. 2, each end face h of the stopper 2 and the coil core 3;
It is processed so that it is on the same plane as the standard.

The other unit BFi, which is bonded and fixed to the upper surface of the yoke 7 described above, the side yoke 8, the spring plate material 10 laminated thereon via the spacer 9, and the spring plate material 10 placed on top of the side yoke 8.
It is constituted by a spring pressing plate 16 that presses down. The wire lever 12 is formed as a ring-shaped member with a large number of spring pieces 11 protruding from the inside, and a protrusion 13 on the core side at the tip.
"- It is attached integrally with the plunger 14, and as shown in FIG. The tip of the plunger 14 and the protrusion 1 of the wire lever 12 in the suctioned state
The lower surface 8α of the flI4hz side yoke 8 is used as a reference and the tip is ground to the same 1,000-sided surface.

In addition, the reference numerals in the figure indicate 44 coils, a 15-wire wire at the tip of the lever, and a 17-wire wire nose, respectively.

Therefore, two units A configured in this way
, B are joined, the side yoke 8 is bent in advance and in the next state.
The tip of the plunger 14 is ground to be flush with the bottom surface 8α of the yoke 70 as a reference, and the tip of the plunger 14 is attracted to the end surface of the coil core 3, which is ground to be flush with the top surface 7α of the yoke 70. However, at the same time, the protrusion 13 of the wire lever 12 is bent in advance so that it is flush with the lower surface 8a of the side yoke 8, and the protrusion 13 of the wire lever 12 is also flush with the upper surface of the yoke 7.
The upper stopper 21C comes into contact with the surface.

When the coil 41C is energized in this state, the wire lever 12, which has been released from the attraction by the permanent magnet 6, returns to its original state due to the elasticity of the spring piece 110 and strikes the platen surface with the wire 15 at its tip. When the current to the coil 4 is cut off, the plunger 14 h'-is attracted to the coil core 3, and at the same time, the protrusion 15 at the tip of the wire lever 12
comes into direct contact with the top of the stopper 2 and enters a waiting state without bouncing. ? In the head, which is a pin spring-charged dot printer head, a hard brittle material (84N4.0aTi03.BaTio, u
, o, -7o), assemble the Univ hB, grind it so that the tip of the plunger 14 and the tip of the protrusion 13 of the wire lever 12 are on the same plane with the lower surface 8α of the side yoke 8 as a reference, and then assemble the unit B. Investigate the warpage.

We also conducted an experiment to investigate the neutral stroke variation by actually operating it as a printer head. What is the tolerance?

Unit B Bara two? ±10μm (range 20μm)
, neutral stroke variation =? ht±20μm (range 40μ7FL).

The experimental results are shown in Figures 3 and 4 after the unit is erected (
See Figure 3, grinding 10μm 312ayc paran l
? However, after grinding, due to mass production.

20 μm 8 f has to be ground, and the amount of grinding is around 12 μm, and 20 μm is unevenly distributed.
m,, aario,, phL, o, -Tio) are numerically equal, and the warpage of unit B does not change from after assembly at Oten 8 degrees (grinding amount 0) to grinding amount 20 μm. Also, even if the neutral stroke varies in actual operation.

It can be said that the result is similar to the warpage of unit B (12 μm). For conventional metals, the hardness is Hv
80-1201 Concave brittle material of the present invention (S-lump).

oa Ti o3. A4o, -Tio) at Hv
Since there is a difference of about 10 times between 800 and 2000 h, making part of the unit a hard and brittle material is considered to be a method to correct the deformation of unit metal parts that are not rigid by using a hard and brittle material that is rigid. It will be done.

〔Effect of the invention〕

As described above, according to the present invention, in a spring-charged dot printer head, one part of the laminated layer/<-+2 constituting the head is made of a hard and brittle material (8i, N, c
aTio, BaTi0. .

(T<O, etc.), the rigidity of the herad unit is obtained, and the unit hardly deforms even during post-processing. (Refer to Figures 3 and 4) In order to ensure this, the neutral stroke variation is suppressed by a single spring sled, which finally operates with low current and achieves stable printing density, while at the same time being lightweight! It has the effect of becoming #.

[Brief explanation of the drawing]

FIG. 1 shows a part of an apparatus showing an embodiment of the present invention.
A dynamic diagram. FIG. 2 is an explanatory diagram showing the main parts of the above device in an exploded manner. Figure 3 is a graph of unit deformation variation due to the grinding amount of the present invention and the conventional method. Figure 4 is a graph of the neutral stroke variation due to the grinding amount of the present invention and the conventional method. 1...Cover 2...Stopper 3...Coil core 4...■+O coil 5j@ψ+-core pace 6...Permanent magnet 7...Yoke 7G・・・Top surface 8・
...Side yoke 9 ...Spacer 10 ...Spring plate material 11 ...Spring piece 12 ...Wire lever 13 ...Protrusion 14 ... Plunger 15 ... Wire 16 ... Spring pressing plate 17 ... Wire nose A, e ... Unit A B ... Unit B The following Applicant: Seiko Epson Corporation ---Si, 3N+ --A120J-7'ic
------5iyh14 ---Ah03- T
;C---CQTioa VL4'
(”Jbp,) flat + factor ”′1”′1 Sumpa

Claims (1)

[Claims] In a spring-charged dot printer head, the spring pressing plate that constitutes the head is made of Si_3N_4 and CaT.
A spring-charged dot printer head characterized by using hard and brittle materials such as iO_3, PaTiO_3, and Al_2O_3-TiC.