JPH0342583B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a print head for a dot printer, and more particularly to a support structure for a print wire and an armature for actuating the print wire.

[Prior Art] In a conventional head of this type, a nose member for slidably supporting a plurality of printing wires and a support member for rotatably arranging and supporting a plurality of armatures are provided. Consists of separate parts,
These parts were assembled and fixed on both sides of a yoke having an electromagnet by adhesive or screw tightening.

[Problems to be solved by the invention] As a result, the number of parts increases and the number of assembly steps increases, resulting in higher costs.Furthermore, due to stacking and storage of both parts after assembly, errors in the assembled parts may occur. This has resulted in defects such as variations in dimensions, misalignment between the printing wire and the armature, and even impeding the printing performance of the printing head.

SUMMARY OF THE INVENTION An object of the present invention is to provide a printing head that eliminates the above-mentioned defects, allows easy and highly accurate assembly of printing wires and armatures, and improves printing performance.

[Means for Solving the Problems] The present invention includes an electromagnetic device assembly 1 in which a plurality of electromagnetic devices 5 are arranged in a ring shape, a through hole 4f is formed in the center thereof, and a printing wire 21 is slidably supported. Nose member 13 inserted into the through hole 4f of the assembly 1
and a support member 17 formed in a flange shape at one end of the nose member 13, having an opening 17d in the center communicating with the inside of the nose member 13, and integrally connected to the nose member 13 around the opening 17d. , an armature 18 for actuating the printing wire arranged radially on the support member 17 and facing each electromagnetic device 5 through a through hole 17e of the support member 17, the printing wire 21 being connected to the armature 18. The nose member 1 is passed through the opening 17d of the support member 17 from a position corresponding to
The nose member 13 has a fixed end connected to the support member 17, and the other end projects to the outside through the through hole 4f of the electromagnetic device assembly.

[Operation] As described above, the nose member 13 is integrally connected around the opening 17d of the support member 17, and the opening 1
7d is communicated with the inside of the nose member 13,
The direction of movement of the armature 18 and the direction of movement of the printing wire 21 can be accurately maintained in a predetermined relationship,
Printing performance can be improved. Furthermore, when assembling the integral part of the support member 17 and nose member 13 into which the armature 18 and printing wire 21 are assembled into the electromagnetic device assembly 1, the armature 18 is supported by inserting the nose member 13 into the through hole 4a. Since it faces the electromagnetic device 5 through the through hole 17e of the member 17, assembly is facilitated.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

Now, the print head of the dot printer of this embodiment consists of an electromagnetic device assembly 1 and a print wire assembly 2.
and an assembly 3 for assembling both 1 and 2.

The electromagnetic device assembly 1 is constructed by arranging a plurality of electromagnetic devices 5 (24 in this embodiment) in a yoke 4 having a substantially bottomed cylindrical shape.
At the open end of d, each electromagnetic device 5 is connected, leaving the partition wall 4a.
A plurality of slits 4b corresponding to the slits 4b are formed. Each electromagnetic device 5 includes a core 6 formed integrally with the bottom wall portion 4e of the yoke 4, and a bobbin 7 attached to the core 6.
Both terminals of the coils 8 are respectively connected to a pair of connection pins 9 protruding from the bobbin 7.
The yoke 4 has a through hole 4f at the center of the bottom wall 4e surrounded by the core 6. A printed circuit board 11 is fixed to the outer surface of the bottom wall portion 4e of the yoke 4 with an insulating plate 10 interposed therebetween, and the connecting pins 9 are passed through this printed circuit board 11 and soldered. and,
In this state, the side surface of the printed circuit board 11 is covered with the protective rubber sheet 12.

The printing wire assembly 2 is connected to the electromagnetic device assembly 1.
The nose member 13 is made of synthetic resin and is inserted into the through hole 4f, and the support member 17 is formed in the shape of a flange at one end of the nose member 13. The nose member 13 has a hollow cylindrical shape, and there are three wire guides 1 inside the nose member 13.
4, 15, and 16 are arranged and fixed at predetermined intervals. The support member 17 has an opening 17d in the center,
It is integrally connected to one end of the nose member 13 around the opening 17d. The opening 17d communicates with the inside of the nose member 13. Nose member 13
The surface of the support member 17 opposite to (hereinafter referred to as the back surface)
A plurality of holding grooves 17a are formed radially in the support member 1 in correspondence with each holding groove 17a.
Projecting pieces 17b that fit into the slits 4b of the yoke 4 are provided on the outer peripheries of the yoke 7, respectively. A through hole 17e facing the core 6 of the electromagnetic device 5 is formed at the bottom of each holding groove 17a, and a support recess 17c is formed in each projection 17b.

Armatures 18 made of plate-shaped members are housed and arranged in each holding groove 17a of the support member 17 with their wide side surfaces adjacent to each other, and support protrusions 18a formed at their outer ends. It is engaged with the recess 17c and rotatably supported on the support member 17. Each armature 18
A protrusion 19 is formed at the center of one side of the support member 17 to face the core 6 of the electromagnetic device 5 through the through hole 17e. Further, one end of a printing wire 21 is fixed to the inner end of each armature 18, and the printing wire 21 extends from the opening 17d of the support member 17 into the nose member 13 and connects to each wide guide 16,1.
5 and 14 and extends toward the platen 20 side.

The supporting member 17 and its projecting piece 17b are inserted into the slit 4.
When the nose member 13 is fitted over the open end of the yoke 4 and brought into contact with the open end of the yoke 4, the connection part with the support member 17 is a fixed end, and the other end is connected to the electromagnetic device. It will be made to protrude to the outside through the through hole 4f of the assembly.

A spring 22 is provided in each holding groove 17a of the support member 17 corresponding to each armature 18, and the action of this spring 22 biases each armature 18 in the backward direction of the printing wire 21. Then, as the electromagnetic device 5 is energized, the armature 1
8 is attracted and rotated toward the core 6 against the action of the spring 22, and the printing wire 21 is projected toward the platen 20.

The holding member 23 made of synthetic resin that holds the armature 18 in the holding groove 17a has a ring-shaped regulating part 24 in its center that comes into contact with the central part of the back surface of the supporting member 17, and the outer periphery of the holding member 23 has a ring-shaped regulating part 24 that abuts the central part of the back surface of the supporting member 17. Three locking claws 26 that engage with the engaging portion 25 are formed in a protruding manner. The armature 18 comes into contact with the regulating portion 24 of the holding member 23 under the action of the spring 22, thereby regulating the retreating position. Also, on the outer periphery of the regulating part 24, there are 24
A pressing arm 27 having elasticity is integrally formed to protrude, and presses and holds the convex portion 18a at the outer end of each armature 18 toward the support recess 17c of the support member 17.

The assembly body 3 is an assembly member 2 made of a plate spring material.
8 and a metal lid body 29 attached to the outer surface of the assembly member 28. Three elastic legs 30 are formed protrudingly on the outer periphery of the assembly member 28, and the yoke 4 of the electromagnetic device assembly 1 is attached to a locking portion 30a formed at the tip of the legs and having a substantially horizontal T-shape. It engages with a stepped engagement portion 31 provided on the outer periphery, and holds the printing wire assembly 2 sandwiched between it and the electromagnetic device assembly 1.

In this embodiment, the printing wire 2 is attached to the integral part consisting of the nose member 13 and the support member 17.
1. Incorporate the armature 18 and the nose member 13
is inserted into the through hole 4f from the open end side of the yoke 4, and the support member 17 is brought into contact with the open end of the yoke 4, and the printing wire assembly 2 is sandwiched between the assembly 3 and the electromagnetic device assembly 1. This completes the assembly.

In particular, since the printing wire 21 and the armature 18 are assembled into an integral part consisting of the nose member 13 and the support member 17, the directions of movement of both can be accurately maintained in a predetermined relationship. In other words, there is no possibility that the armature and the printing wire will be misaligned, unlike the conventional method in which the nose member and the support member are separately assembled to the electromagnetic device.

Further, by inserting the nose member 13 into the through hole 4f of the electromagnetic device assembly 1, the armature 18 is inserted into each electromagnetic device 5 through the through hole 17e of the support member 17.
The nose member 13 is supported by the support member 17 and protrudes from the electromagnetic device assembly 1 to a predetermined position. Therefore, it can be assembled accurately and easily.

[Effects of the Invention] As described above, the present invention allows the printing wire and the armature to be assembled into a single component and further to incorporate it into the electromagnetic device assembly, so that the relationship between the printing wire and the armature can be maintained accurately. It can be easily assembled and exhibits excellent printing performance.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a print head embodying the invention, FIG. 2 is a sectional view taken along line A--A in FIG. 1, and FIG. 3 is a partially exploded perspective view. In the figure, 1 is an electromagnetic device assembly, 2 is a printing wire assembly, 13 is a nose member, 17 is a support member, 18
is an armature, and 21 is a printing wire.

Claims (1)

[Scope of Claims] 1. An electromagnetic device assembly 1 in which a plurality of electromagnetic devices 5 are arranged in an annular manner and has a through hole 4f in the center, and a printing wire 21 is slidably supported, and a transparent The nose member 13 is inserted into the hole 4f, and one end of the nose member 13 is formed in the shape of a flange, and has an opening 17d in the center that communicates with the inside of the nose member 13, and the nose member 13 is formed around the opening 17d. Support member 1 integrally connected with
7, arranged radially on the support member 17, and connected to each of the electromagnetic devices 5 through the through hole 17e of the support member 17.
and an armature 18 for operating the printing wire, which is opposed to the armature 18, and the printing wire 21 extends into the nose member 13 from a position corresponding to the armature 18 through the opening 17d of the support member 17, and the nose member 13 2. A printing head characterized in that the connection part with the support member 17 is a fixed end, and the other end projects to the outside through a through hole 4f of the electromagnetic device assembly. 2. The electromagnetic device assembly 1 has the through hole 4f in the center of the bottom wall portion 4b of the yoke 4 having a cylindrical shape with a bottom, and the nose member 13 has the bottom wall portion 4e of the yoke 4.
2. The printing head according to claim 1, wherein the print head is inserted from the open side of the cylindrical wall 4d opposite to the cylindrical wall 4d, and the support member 17 is positioned so as to cover the open side of the cylindrical wall 4d. 3. The support member 17 is supported in contact with the open end of the cylindrical wall portion 4d at its outer periphery, and holds the nose member 13 in a state passing through the through hole 4f of the bottom wall portion 4e. Print head as described in section.