JPH0443787B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a wire dot type print head, and more particularly to a printing wire and an assembly structure of an armature for driving the printing wire.

Conventional technology Conventionally, the printing wire in a wire dot print head cannot return to the printing standby position by itself after the printing operation is completed.
The same wire is brazed to an armature that is brazed to a return leaf spring, so that the return force of the return leaf spring returns the vehicle to the standby position.

Conventionally, the work of brazing the printing wire and the armature, as well as the armature and the return leaf spring, was very time-consuming. Furthermore, the work of assembling the brazed printing wire, armature, and leaf spring has become extremely troublesome.

Purpose This invention was made in order to solve the above-mentioned problems, and its purpose is to eliminate the need for brazing the printing wires, simplify the structure of the print head, and greatly simplify the assembly and maintenance work of the print head. In addition, damage and abrasion of the printing wire and armature due to non-brazing can be prevented without interposing a synthetic resin film or the like between the wire and the armature, which is used only for the purpose of preventing damage and abrasion. An object of the present invention is to provide a print head that can reliably prevent such problems.

Structure of the Invention In order to achieve the above-mentioned object, the structure of the present invention includes an armature supported on a frame of the print head so as to be rotationally driven by a solenoid, and an armature that is resiliently driven based on the rotation of the armature. a printing wire supported by the frame so that the base part is supported by the frame so as to be swingably supported between the armature and the printing wire in contact with the armature and the printing wire; and a wear-resistant member having.

Embodiment Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings.

FIG. 1 shows a partially cutaway side view of the print head, and the yoke member 1 includes an inner yoke 1b extending forward from the center of a disk-shaped base 1a, and an inner yoke 1b as shown in FIGS. 3 and 4. and 24 outer yokes 1c extending from the base 1a so as to be arranged in an annular shape along the outer periphery of the inner yoke 1b. A fitting stepped portion 1d is provided on the outer circumference of the tip of the inner yoke 1b.
is formed, and each outer yoke 1
A solenoid 2 is wound around c. Furthermore, three engaging grooves 1e are formed at equal intervals on the outer periphery of the base 1a of the yoke member 1, and the rear side of the engaging grooves 1e is cut deeper to form a locking stepped surface 1f. are doing.

The armature holding member (hereinafter simply referred to as the holding member) 3 disposed on the front side of the yoke member 1 is molded from synthetic resin, and as shown in FIGS. 5 to 7, its annular outer peripheral frame portion Twenty-four intermediate frame portions 3b are formed extending toward the center from 3a. Each intermediate frame portion 3b is formed into a tapered shape, and the interval between each intermediate frame portion 3b is made equal to the width of the outer yoke 1c. The holding member 3 is disposed with respect to the yoke member 1 such that the spaces formed between the intermediate frame portions 3b face the outer yoke 1c.

The bridging frame portion 3c that bridges the tips of the intermediate frame portions 3b has a rear side projecting rearward and has an annular shape as a whole, and its inner surface fits into the fitting stepped portion 1d of the inner yoke 1b. Further, the front side portion of the bridging frame portion 3c, which provides internal pressure between the intermediate frame portions 3b, is formed to have an arcuate cross section as shown in FIG. 7, and serves as a swing fulcrum 3d. Three engagement grooves 3e are formed on the outer periphery of the outer circumferential frame portion 3a to face the engagement groove 1e formed in the yoke member 1.

The armature 4 disposed between the respective intermediate frame parts 3b of the holding member 3 has a fitting recess 4a formed on the rear side thereof fitted into the swinging fulcrum 3d of the bridging frame part 3c, and is centered around the fulcrum 3d. It is designed to be rotatably supported. The armature 4 is always held in the state shown in FIG. 1 by a wear-resistant member made of synthetic resin having elastic force, which will be described later.On the other hand, the armature 4 is held in the state shown in FIG. The outer rear surface of the outer yoke 1c is attracted to the front end surface of the outer yoke 1c, and is rotated counterclockwise as shown in FIG.

A wear-resistant member 5 having elastic force disposed on the front side of the holding member 3 is molded from synthetic resin,
As shown in FIGS. 10 to 15, 24 ribs 5b corresponding to the armatures 4 are formed extending toward the center from the annular base 5a, and the front end of each rib 5b has a U-shaped cross section in the longitudinal direction. A fitting groove 5c having a shape is formed.

An elastic piece 5d is provided protruding from the rear side of the tip end of each rib 5b, and is in contact with the inner front surface of the corresponding armature 4, respectively. Each elastic piece 5d always holds the armature 4 as shown in FIG. It is fired by the front surface of the inside part of the body and is pushed forward as shown in FIG.

Furthermore, three engagement grooves 5e are formed on the outer periphery of the base portion 5a of the wear-resistant member 5, and are opposed to the engagement grooves 3e formed in the holding member 3.

The front frame 6 disposed on the front side of the wear-resistant member 5 is molded from synthetic resin, and has 24 annular recesses formed at equal intervals on its rear surface, as shown in FIGS. 17 and 18. The fixing recesses 6a are arranged on the wear-resistant member 5 so as to face the ribs 5b of the wear-resistant member 5, respectively. or,
The wear-resistant member 5 is provided on the outer periphery of the front frame 6.
Three engagement grooves 6b are formed to face the engagement groove 5e formed in the above.

A guide member 6c is formed protrudingly from the center of the front surface of the front frame 6, and as shown in FIG. Correspondingly, 24 guide holes 6d serving as guide portions are transparently provided. As shown in Fig. 19, the 24 guide holes 6d are provided in a rectangular shape as a whole. The holes 6d are arranged,
Twelve guide holes 6d are arranged in a reverse dogleg shape on the right half.

The individual relative deviations of the 12 guide holes 6d on the left half are determined in the vertical direction (Y direction) and the horizontal direction (X direction).
Direction: However, the 6th and 7th guide holes 6 from the top
d) are shifted by the diameter of the guide hole 6d. In addition, the 12 guide holes 6d on the right half are also individually shifted in the same way as the 12 guide holes 6d on the left half, and as a whole they are shifted in the Y direction with respect to the 12 guide holes 6d on the left half. They are relatively shifted by the radius of the guide hole 6d and by the diameter of the guide hole 6d in the X direction.

Then, the 24 guide holes 6 arranged in this way
Each printing wire 7 described below based on d is 24×24
It is designed to perform dot matrix printing.

Each of the 24 printing wires 7 bent into an L-shape has its base end 7a bent into a "U" shape, and its base end 7a is fitted into each of the fixing recesses 6a of the front frame 6. The base portions 7c, which are fixedly attached and extend from the base end portion 7a toward the center to the bent portion 7b, are fitted into the fitting grooves 5c of the corresponding wear-resistant members 5, respectively. On the other hand, the bent portion 7b
The tip 7d of each printing frame 7 extends forward from
The printing portions pass through guide holes 6d formed in the guide member 6c of the front frame 6, which are respectively predetermined as printing portions, to form a 24×24 dot matrix.

Each printing wire 7 is driven forward for printing by being ejected forward via the elastic piece 5d of the wear-resistant member 5 based on the rotation of the corresponding armature 4.

A locking body 8 disposed on the rear side of the yoke member 1
As shown in FIGS. 21 to 24, three fitting recesses 8a are formed on the outer periphery of the yoke member 1 so as to face the engagement grooves 1e formed in the yoke member 1.
One side wall of each fitting recess 8a is formed with a claw portion 8b extending in the circumferential direction, and the front surface of the claw portion 8b is flush with the front surface of the locking body 8, and the rear surface thereof is as shown in FIG. It is formed into a tapered shape so that the tip is tapered.

The mounting body 9 disposed on the front side of the front frame 6 has a rectangular through-hole 9a at the center thereof through which the guide member 6c of the frame 6 projects, and the yoke member 1 and the holding member 3 on the outer periphery. , the abrasion resistant member 5, and the front frame 6, each of which has three engaging arms 9b extending rearward to engage with the engaging grooves 1e, 3e, 5e, and 6b formed in the front frame 6, respectively. The tip thereof is bent into a U-shape to form an engaging hook 9c, and the engaging hook 9c is engaged with the claw portion 8c of the locking body 8. Therefore, the mounting body 9 is connected to the locking body 8, the yoke member 1, the holding member 3, the wear-resistant member 5,
And the front frame 6 is stacked and fixed.

In this embodiment, the printing wire 7
is bent into an L shape, and the base end 7a of the printing wire 7 is formed in the front frame 6.
a and the tip 7 of the printing wire 7.
The guide member 6 of the front frame 6 is movable.
guide hole 6d formed in c. and,
The base 7c of the printing wire 7 receives the rotational driving force of the armature 4 via the elastic piece 5d of the wear-resistant member 5, drives the printing wire 7, and performs dot matrix printing at the tip 7d of the printing wire 7. As a result, the printing wire 7 can be reliably driven for printing without having to braze its base end to the armature, unlike conventional printing wires.

Further, there is no need to braze the printing wire 7 to the armature 4, and the armature 4 is always held by the elastic return force of the wear-resistant member 5 and the printing wire 7 as shown in FIG. Since there is no need to braze the leaf spring for the print head, the number of troublesome work steps is reduced, and the troublesome work of assembling the printing wire and armature, which are integrally brazed together, is also eliminated.

Since the wear-resistant member 5 is swingably supported by its own elastic force, it is possible to maintain a good contact state between the base 7c of the printing wire 7 and the armature 4, so that the armature 4 is connected to the printing wire. 7, and there is no possibility that both members 4 and 7 would damage or wear each other due to collision. Therefore, there is no need to interpose a synthetic resin film or the like between the wire 7 and the armature 4, which is used only to prevent damage and wear.

In addition, in this embodiment, the outer yoke 1c around which the solenoid 2 is wound is arranged in an annular manner around the outer periphery of the inner yoke 1b, and these solenoids 2
Since the armatures 4, which are rotationally driven by The area occupied by the solenoid and the suction area of the armature can be made larger compared to the outer shape of the print head, and the suction force of the armature 4, that is, the elastic force of the printing wire 7 can be increased.

Further, in this embodiment, the print head is assembled by attaching the retaining member 8, the yoke member 1, the holding member 3 holding the armature 4, and the wear-resistant member 5 so as to face the rib 5b of the wear-resistant member 5. 5 and the front frame 6, an engagement hook 9c is formed on the engagement arm 9b of the mounting body 9.
is inserted into the fitting part 8a of the locking body 8 from the frame 6 side, and then the locking body 8 is rotated and the claw part 8
Assembling the print head is very simple since it is only necessary to engage the print head. Moreover, at this time, the engagement arm 9b of the mounting body 9 is connected to the yoke member 1,
The holding member 3, the engagement grooves 1e, 3e, 5 formed on the wear-resistant member 5 so as to face the ribs 5b of the wear-resistant member 5, and the front frame 6.
Since it is engaged with e and 6b, each member will not be displaced relative to each other due to vibration or the like during a printing operation, thereby preventing the printing operation from becoming impossible. In addition, when the engaging hook 9c formed on the engaging arm 9b of the attachment body 9 and the claw portion 8b of the locking body 8 are in the engaged state, simply rotating the locking body 8 allows the engaging hook 9c and the claw portion 8b to be separated. Since the print head is disengaged, the print head can be easily disassembled and maintenance work is very simple.

Note that the present invention is not limited to the above-mentioned embodiment, and for example, the printing wire 7 may be simply bent into an L-shape as shown in FIG. Alternatively, the frame 6 and the wear-resistant member 5 may be supported by the wear-resistant member 5 so as to face the ribs 5b of the wear-resistant member 5, or may be integrated with the front frame 6 in the above embodiment. Guide holes 6d are formed on the front surface of the guide member 6c, which is formed as shown in FIG. It may also be carried out by attaching it.

Effects of the Invention As described in detail above, the present invention provides a print head with an armature supported by the frame of the print head so as to be rotationally driven by a solenoid, and to be elastically driven based on the rotation of the armature. The printing wire is supported on the frame so that the base part is supported by the frame so as to be swingably supported between the armature and the printing wire while being in contact with the armature and the printing wire. By providing a wear-resistant member with the print head, there is no need to braze the print wire and the armature, simplifying the structure of the print head, and making assembly and maintenance of the print head extremely easy. does not hit the printing wire directly, and by making the wear-resistant member swingable, the wear-resistant member can maintain good contact between the armature and the printing wire. Since there is no possibility of damage or wear due to collision between the print wires and the armature, it has an excellent effect of reliably preventing damage and wear of the printing wire and armature.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view of the print head, Fig. 2 is a sectional side view of the main part showing the operation of the armature,
3 and 4 are front views of the yoke member and
5 and 6 are front and rear views of the holding member, FIG. 7 is a sectional view taken along the A-A line in FIG. 5, and FIGS. 8 and 9 are front views of the armature. Figures 10 and 11 are front and rear views of the elastic body, Figures 12 to 14 are front views, rear views, and side sectional views of the ribs of the elastic body, and Figure 15 is the elastic body. 16 to 18 are a front view of the front frame, a back view, and a sectional view taken along the line A-A in FIG. 17; FIG. 19 is a front view showing the arrangement of guide holes; FIG. 20 is a side view of the printing wire,
Figures 21 to 23 are front views, rear views, and partially cutaway side views of the locking body, Figures 24 and 25 are front views and side views of the mounting body, and Figure 26 is another example of the printing wire. 27 and 28 are a front view and a side sectional view showing another example of the front frame. In the figure, 1 is a yoke member, 1b is an inner yoke, 1c is an outer yoke, 2 is a solenoid, 3 is an armature holding member, 3a is an outer peripheral frame part, 3b is an intermediate frame part, 3c is a bridging frame part, and 3d is a Swinging fulcrum, 4 armature, 5 wear-resistant member, 5
a is the base, 5b is the rib, 5c is the elastic piece, 6 is the front frame, 6a is the fixed recess, 6d is the guide hole, 7 is the printing wire, 7a is the base end, 7b is the bent part, 7c is the base, 7d is the tip, 8 is the locking body,
8b is a claw portion, 9 is a mounting body, and 9c is an engagement hook.

Claims (1)

[Scope of Claims] 1. An armature 4 supported on a frame 6 of the print head so as to be rotationally driven by a solenoid 2; and an armature 4 supported on the frame 6 so as to be elastically driven based on the rotation of the armature 4. the supported printing wire 7; and a base 5 so as to be swingably supported in contact with the armature 4 and the printing wire 7 between the armature 4 and the printing wire 7;
1. A print head characterized in that a is provided with a wear-resistant member 5 having an elastic force and supported by the frame 6.