JPS59156760A - Type head - Google Patents

Abstract

PURPOSE:To form a spring-energized, easy to manufacture, quality fluctuation eliminating and power saving type head by only constructing a lateral magnetic path ring by means of installing a permanent magnet between 2 planes of accommodating iron core. CONSTITUTION:Between iron cores 5a, 5b, a lateral magnetic path ring 12 composed of permanent magnet 6 and ferromagnetic body thinner than the permanent magnet are inserted. Mutually contacting surfaces of magnetic circuit composing parts (iron core 5a, permanent magnet 6, iron core 5b, armature 2, lateral magnetic path ring 12) are all parallel. Further, when 2 parts are applied onto a single part, these surfaces become the same plane. This kind of construction permits reduction of man-hour figures for production and facilitates location of reference position reducing than dimensional errors and improving working accuracies. As a whole, fluctuation of quality is minimized.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a print head of an impact type printer, in which a magnet is used as a permanent magnet or other suction blade, and a coil is reversely excited to generate vibrations stored in a spring. This article concerns the electromagnetic mechanism of a printer that uses strain energy to energize an armature metal and perform printing.

[Background of the invention]

In a conventional spring force-biased printhead with permanent magnets, the electromagnetic mechanism is, for example,
No. 7, JP-A-56-8456.

As seen in Japanese Unexamined Patent Publication No. 56-49279, a side magnetic path is connected in parallel with the magnetic flux to adjust the magnetic flux generated by the permanent magnet, reduce power consumption, and improve the magnetic field. There were some that had a function to prevent interference.

In addition, the spring mechanism of the conventional spring force-energized print head is
For example, JP-A-55-154178, JP-A-55-
As disclosed in Japanese Patent No. 152071, the mechanism was such that the spring of the armature was solidified and the -4 end of this spring was fixed to the base body with a screw or the like. In the conventional spring fixing method, it is difficult to adjust the spring force after assembly, and even if the processing accuracy is high, variations in the spring force must be tolerated. Therefore, another means of dispersion of the spring blade is used, for example, as seen in Japanese Patent Application Laid-Open No. 53-137717, the attraction force of the permanent magnet is adjusted using magnetic shunt steel as a side magnetic path, and the print head is It was designed to work even if there were variations in the data. Therefore, if a spring force adjustment mechanism is provided, the value as a means for adjusting the magnetic flux of the permanent magnet will be reduced.

Next, the second effect of the side magnetic path is the reduction in power consumption, which is not mentioned in JP-A-56-8456. When the coil is reverse excited, the magnetic flux of the permanent magnet is This is very effective because the magnetic path is easily transferred from the main circuit on the attraction member side to the magnetic shunt steel side on the bypass side.

The type of magnetic path on this side is JP-A-53-137717.
No. 8456/1984, which uses magnetic shunt @r that seems to be a ferromagnetic material, and JP-A-56-8456.
As seen in Japanese Patent Application No. 49279, there is a V type used as a narrow bond-air gap gold-side magnet.

To state the purpose of the side magnetic path again, when the coil is reverse excited, the magnetic flux of the main circuit passing through the armature attraction member is easily transferred to the side magnetic path, thereby reducing the current in the coil. Smell.

However, since the side magnetic path is desired to be in parallel with the main circuit, even when the armature is attracted to the magnetic pole, a certain amount of magnetic flux from the permanent magnet flows into the side magnetic path. Therefore, if the magnetic resistance of the side magnetic path is reduced and the effect of the side magnetic path is reduced, the coil current for reverse excitation will decrease, but
Before reverse excitation, even when the armature is attracted, the magnetic flux of the permanent magnet flows too much into the side magnetic path, reducing the magnetic flux in the main magnetic path and reducing the attractive force on the armature, which causes the printing head to As a result, it becomes impossible to operate.

Therefore, the magnetic resistance of the side magnetic path cannot be made much smaller than that of the main magnetic path, and the magnetic resistance must be increased to some extent. This means that in the case of a companion magnetic path using a magnetic material, the cross-sectional area cannot be made large. This means that even when the armature is attracted, the side magnetic path is near magnetic saturation. Furthermore, when reverse excitation is performed, much more magnetic flux flows into the side magnetic path, so at this time the side magnetic path using magnetic material is completely magnetically saturated, reducing the effect of reducing the coil current. The disadvantage is that there are fewer The device that uses a narrow air gap as a side magnetic path, as shown in Japanese Patent Application Laid-open No. 56-49279, uses unsaturated air as magnetic resistance, so the effect of low current range is remarkable even during reverse excitation. It has the advantage of

As mentioned above, although the side magnetic path has the effect of reducing the current in the coil, it also has the disadvantage that the magnetic flux in the main circuit magnetic path decreases, reducing the attractive force of the armature. Therefore, even when using the side magnetic path τ of the air gap, the gap length of 7,
It is necessary to strictly manage performance records and other matters.

In recent years, the wire dot impact printers in this building have become highly dense and high-definition, and the number of wires, that is, the number of electromagnetic mechanisms, has increased to VC.

In the conventional type, it is not possible to uniformly manufacture the total gap, opposing area, and other factors of the side magnetic path of each magnet @ groove in one print head, resulting in poor productivity (i. -I was doing ■.

[Purpose of the invention]

An object of the present invention is to provide a spring-loaded rod-shaped print head that is easy to produce, has little variation within one print head, and consumes less power.

[Summary of the invention]

In order to achieve the above object, the present invention provides a spring-loaded rod-shaped print head KJ with a side magnetic path in parallel with the main magnetic path called the armature, and leaves the end of the leaf spring unfixed. A circular hole or a protruding circular hole is provided, and a pressing member such as a screw with a conical tip is engaged with the circular hole, so that the spring force is adjusted to A by rotation of the screw.

In addition, each component that makes up the entire magnetic circuit R5 of the print head is configured so that each part touches only one parallel plane.
Use something that is easy to assemble.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention will be described with reference to FIG. Ifi.

FIG. 1 shows the configuration of the print head of the present invention. In the figure, 1 is a printing wire, 2 is an armature, 3 is a lever that fixes the printing wheel l and the armature 2, and 4 is a plate provided on the armature 2. Spring, 5a, 5b are iron cores, 6 is a permanent magnet provided between iron cores 5a, 5b, 7 is a coil installed in a part of magnetic pole 5C of iron core 5a, sa, sb are iron core 5a
, 5b, 9 is a screw that comes into contact with a circular hole provided in the leaf spring 4 to adjust its spring force, 10 is a guide that guides the printing wire 1, and 11 is a holder for the guide 10. , 11 are locked by the guide part of the lever.

Reference numeral 12 denotes a side magnetic path ring made of ferromagnetic material.

Next, the entire operation of the print head described above will be explained.

Before printing starts, the armature 2 is a permanent magnet 6,
It is attracted to the υ iron core 5a by an attractive force generated by magnetic flux passing through the iron core 5a, the magnetic pole 5c, the armature 2, and the iron core 5b. At this point, the temporary spring 4 is bent and generates a restoring force. Here, by rotating the screw 9, the plate 72
The spring force of 4 can be adjusted to suit your needs. Next, a first flow is applied to the coil 7, and the magnetic flux from the permanent magnet 6 of the iron core 5a is transferred to the side magnetic path, that is, the path of the Mizuku stone 6, the side magnetic path ring 12, the air gap, and the iron core 5b. 2 and the iron core 5a, the armature 2 rotates in the direction of the arrow in Figure 1 using point A as a fulcrum, and the tip of the printing wire l is not shown in the figure. Perform impact printing on ink ribbon f paper, etc.

The spring blade can be easily adjusted with the eye adjustment distortion machine after the print head is assembled. Therefore, it is not necessary to separately conduct the side magnetic circuits of each electromagnetic mechanism of one print head.

In addition, the parts that make up the entire magnetic circuit (iron core 5a, permanent magnet 6
, the iron core 5b, the armature 2, and the side magnetic path ring 12) are all parallel to each other. Furthermore, when two parts are attached to one part, their surfaces are the same plane. For example, when the permanent magnet 6 and the side magnetic path ring 12 are fully connected to the iron core 5a, these contact portions are also planes. Regarding armature 2,
The contact surfaces of the iron core 5a and the iron core 5b are on the same plane.

This type of structure reduces man-hours during production, and
Since the reference position is easily found, there are fewer dimensional errors (lx<lx), which improves processing accuracy and reduces overall variation, which is an advantage.

FIG. 2 shows the main parts constituting the magnetic circuit (I-) shown in FIG. , and the portions in contact with the side magnetic path ring 12 are common.Since the iron core 5a has a complicated shape, it is manufactured by slicing and molding.

Since the permanent magnet 6 is made of a high-performance rare earth magnet gold layer, the thickness of the magnet can be made thin. Since the side magnetic path ring 12 is thinner than the permanent magnet 6, mere punching is sufficient. Even if the lot changes 9 or the performance of the permanent magnet 6 changes, the uniform performance can be maintained by simply changing the plate thickness of the side magnetic path ring 12.

The iron core 5b has a shape in which a small ring is attached to a thick ring. A point A at which the armature 2 rotates is formed on the upper surface of the small fz lj song. Conventionally, in a spring-loaded rod-shaped print head equipped with a permanent magnet, the center of rotation of the armature was not clearly on the same plane due to variations in processing. However, in the present invention, the center of rotation of each armature assembly is located on a small ring surface on the iron core 5b.

Conventionally, in a spring-biased print head, for example, a lever 3 and a spring 4 are attached to an armature 2, and then a long print wire 1 is welded to the lever -3, and after the print head is fully assembled, The wire l protruding from the lever 30 guide was cut. Therefore, after cutting the wire, it was often necessary to clean the print head to remove chips from the wire 1.

According to the present invention, since the rotation centers of all the armatures 2 are set on the same plane, before assembling the entire print head,
After the entire armature assembly is assembled, the print wire can be cut using the suction surface of the armature 2 as a reference, and there is no need to clean the print head. The reason why the iron core 5b has a two-stage structure is that the printing wire 1 operates with a large stroke, the armature 2 rotates as the center of the rotational support, and the spring 4 does not move away from the screw 9. This is to prevent the rotational movement from stopping due to the spring 4 coming into contact with the iron core 5b, and is a unique structure of the present invention.

FIG. 3 shows a second embodiment of the print head of the present invention, in which the side magnetic path ring 12 is provided inside the permanent magnet 6, unlike the previous example. Reference numeral 13 is a non-magnetic elastic material such as silicone rubber, which performs the full function of pressing and fixing the side magnetic path ring 12 gold. With such a structure, it is possible to easily fix the side magnetic path ring 12 between the iron cores 5a and 5b.

In the first and second embodiments of the present invention, the side magnetic path ring 12 was attached to the iron core 5aO1ll, but it was also attached to the iron core 5b side, or to the iron core 5a containing the permanent magnet 6.

Even at the intermediate position of 5b, the effect remains the same.

〔Effect of the invention〕

As described above, according to the present invention, the ring for the side magnetic path can be constructed by simply installing it between the two planes of the iron core sandwiching the gold of the Mizuku magnet, so production is easy, there is little variation, and There is an advantage of being able to provide a spring-loaded vertical print head that consumes less power.

In addition, since the iron core 5b has a large number of armature rotation centers within the same plane, there are advantages such as improved productivity.

[Brief explanation of drawings]

FIG. 1 is a longitudinal section l1 showing an embodiment of the print head of the present invention.
11, FIG. 2 is a perspective view of the main parts constituting the magnetic circuit in one embodiment of the print head of the present invention shown in FIG. 1, and FIG. 3 is a perspective view of another embodiment of the print head of the present invention shown in FIG. FIG. 2 is a longitudinal side view showing an example. 1... Printing wire, 2... Armature, 3...
Lever, 4... Spring, 5a, 5b... Iron core, 6...
・Permanent magnet, 7... Coil, 9... Screw, 12...
・Ring for side magnetic path, boar 1 Figure %z assistance

Claims (1)

[Scope of Claims] 1. In a print head in which the attractive force of a permanent magnet, etc. is biased by a strain force stored in a spring by reverse excitation by a coil, the armature is energized by two iron cores sandwiching the permanent magnet. A print head characterized by having a ferromagnetic bar thinner than the permanent magnet placed between them. 2. In the print head according to claim 1, 2.
The print head is unique in that the ferromagnetic material is formed into a circular ring. 3. In the print head according to claim 1, 2.
The ferromagnetic material is arranged between the iron cores through elasticity yf-τ of rubber or the like and extends over the edge t-1 + ridges of the print head.