JPH03183565A - Print head - Google Patents

Abstract

PURPOSE:To reduce manufacturing cost and to improve accuracy by planting a nose body, communicated with a through-hole, integrally on one side face at a flange part having the central through-hole, making a holding groove spreading radially from the through-hole in the other side face, and arranging an armature supporting member having a through-hole in the holding groove. CONSTITUTION:A print head comprises an electromagnetic assembly 1, a print wire assemble 2, and a unit 3 for assembling them 1, 2. The electromagnetic assembly 1 comprises a plurality of electromagnetic devices 5 arranged in an approximately cylindrical bottomed yoke 4, whereas the print wire assembly 2 comprises a synthetic resin nose member 13 to be inserted into the through- hole 4f of the electromagnetic assembly 1 and a supporting member 17 formed integrally with the flange at one end of the nose member 13. Integral part of the nose member 13 and the supporting member 17 is assembled with a print wire 21 and an armature 18, the nose member 13 is inserted into the through-hole 4f from the open end side of the yoke 4 while simultaneously the supporting member 17 is brought into contact with the open end of the yoke 4, and the print wire assembly 2 is held between the assemblies 1 and 3 thus completing assemblage.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a print head, and more particularly to a print head that prints by suctioning an armature holding a print wire.

[Prior Art] Conventionally, in this type of print head, a nose body for slidably supporting a plurality of print wires and a support body for rotatably arraying and supporting a plurality of armatures are separate. It was made up of parts.

These parts were assembled and fixed on both sides of a yoke containing an electromagnet by gluing or screwing.

[Problems to be Solved by the Invention] However, the print head as described above has disadvantages in that the number of parts increases and the number of assembly steps increases, resulting in high costs. j7 It may be that when the two parts are assembled and stored in a stack, the parts may be misaligned during assembly, resulting in dimensional errors, or the correspondence arrangement between the printing wire and the armature may be incorrect, which may impede the printing performance of the print head. Problems arose.

In addition, there is a problem in that many steps are required to attach a large number of armatures that hold printing wires to desired positions, and it is desired to simplify this assembly.

The present invention has been made to solve the above problems,
The purpose is to provide a print head that can reduce the number of parts and assembly steps, lower manufacturing costs, and increase the precision of the manufactured print head.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides that a nose body that communicates with the through hole is integrally erected on one side of a flange portion having a through hole in the center, and an armature support member having a holding groove radially extending from the through hole, a through hole formed in the holding groove; an armature inserted into the holding groove of the armature support member; The armature is characterized in that it has a through hole through which the armature passes through, and a driving means having a driving section surrounding the armature for driving the armature through the through hole.

Further, the armature support member may be provided with positioning means for positioning with the drive means.

[Operation] In the print head of the present invention having the above configuration, the armature is inserted and arranged along the holding groove of the armature support member. Therefore, it is only necessary to line up the armature with respect to the holding groove, so there is no need to consider positioning in the circumferential direction. Therefore, the number of assembly steps can be reduced.

Furthermore, since the portion supporting the armature is integrated with the nose body as described above, there is no need to consider their positioning, and therefore the positional relationship between the nose body and the armature can be easily determined.

Furthermore, as mentioned above, since both are integrated,
Reducing the number of parts also contributes to cost reduction, and since they are integrated, there are fewer dimensional errors between them.

Further, by configuring the present invention as shown in claim 2, the armature support member and the driving means can be easily positioned, so it is possible to greatly improve the assembly efficiency, and the accompanying There is no increase in costs.

[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 includes an electromagnetic device assembly 1, a print wire assembly 2, and both of them 1.
．． It is composed of three units, including an assembly body 3 for assembling 2 and 3.

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. A plurality of slits 4b corresponding to each electromagnetic device 5 are formed except for the partition wall portion 4a. Each electromagnetic device 5 includes a core 6 formed integrally with the bottom wall 4e of the yoke 4, and a coil 8 wound around the core 6 via a bobbin 7. Both terminals of the coil 8 are connected to each other. The bobbin 7 is connected to a pair of connection pins 9 that protrude from the bobbin 7, respectively.

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. 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 inserted into the through hole 4 of the electromagnetic device assembly 1.
The nose member 13 made of synthetic resin is inserted into the nose member f, and the support member 17 is integrally formed with a flange at one end of the nose member 13. The nose member 13 has a hollow cylindrical shape, and three wire guides 14, 15, 16 are arranged and fixed therein at predetermined intervals. The support part +117 has an opening 17 in the center.
d, and around the opening 17d, the nose member 1
It is integrally connected to one end of 3. The opening 17d communicates with the inside of the nose member 13. A plurality of holding grooves 17a are formed radially on the surface of the supporting member 17 opposite to the nose member 13 (hereinafter referred to as the back surface), and each holding groove 1
Projecting pieces 17b that fit into the slits 4b of the yoke 4 are provided on the outer periphery of the support member 17 in correspondence with the slits 4b of the yoke 4, 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 four supporting portions 17c are formed on each protruding piece 17b.

Armatures 18 made of plate-like 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 fourth portion 17e and rotatably supported by the support member 17''. At the center of one side of each armature 18 is a through hole 17 of the support member F.
A protrusion 19 is formed that faces the core 6 of the electromagnetic device 5 via e. Further, one end of a printing wire 21 is fixed to the inner end of each armature 18, and these printing wires 2
1 extends from the opening 17d of the support member 17 into the nose member 13 and extends toward the platen 20 through each wire guide 16, 15°14.

When the support member 17 is provided transparently so as to fit the projecting piece 17b into the slit 4b and cover the open end of the yoke 4, the nose member 13 is attached to the support member 1 as shown in FIG.
The connection part with 7 is a fixed end, and the other end is made to protrude to the outside through the through hole 4f of the electromagnetic device assembly.

Each holding i of the support member 17 corresponds to each armature 18.
A spring 22 is provided in 317a, and the action of this spring 22 urges each armature 18 in the direction of retreat of the printing wire 21. As the electromagnetic device 5 is energized, the armature 18 is attracted and rotated toward the core 6 against the action of the spring 22, so that the printing wire 21 is projected toward the platen 20.

A holding member 23 made of synthetic resin that holds the armature 18 in the holding groove 17a has a ring-shaped regulating portion 24 in its center that abuts the center of the back surface of the supporting member 17, and the outer periphery of the supporting member 17. Three locking pawls 26 are formed to protrude and engage with the engaging portions 25 of. The armature 18 comes into contact with the regulating portion 24 of the holding member 23 due to the action of the spring 22, thereby regulating the backward position. Further, 24 elastic pressing arms 27 are integrally formed on the outer periphery of the regulating portion 24 to press and hold the convex portion 18a at the outer end of each armature 18 toward the support recess 17c of the support member 17. ing.

The assembly 3 includes an assembly member 28 made of a plate spring material, and a metal lid 29 assembled to the outer surface of the assembly member 28.
It is composed of. Three elastic legs 30 are formed protruding from the outer periphery of the assembly part 28, and the electromagnetic device assembly 1 is held at a locking part 30a formed at the tip of the leg part 30, which has a substantially horizontal T-shape. It engages with a stepped retaining portion 31 provided on the outer periphery of the yoke 4, and holds the printing wire assembly 2 sandwiched between it and the electromagnetic device assembly 1.

In this embodiment, the printing wire 21 and the armature 18 are assembled into an integral part cut out from the nose member 13 and the support member 17, and the nose member 13 is inserted into the through hole 4f from the open end side of the yoke 4. The supporting member 17 is brought into contact with the open end, and the electromagnetic device assembly 1 is moved by the assembled body 3.
The assembly is completed by sandwiching the printing wire assembly 2 between the two.

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 in the conventional case where the nose member and the support member are separately assembled to the electromagnetic device.

Furthermore, by inserting the nose member 13 into the through hole 4f of the electromagnetic device assembly 1, the armature 18 can be made to correspond to each electromagnetic device 5 through the through hole 17e of the support member 17, and the nose member 13 is It is supported by the 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 is clear from the above detailed description, in the present invention, the armatures are aligned by being inserted into the holding grooves, so there is no need to consider the positioning of the armatures in the circumferential direction. Therefore, the number of assembly steps can be reduced. Further, as described above, since the portion supporting the armature is constructed integrally with the nose body, there is no need to consider their positioning, and therefore the positional relationship between the nose body and the armature can be easily determined.

Furthermore, as mentioned above, since both are integrated,
Reducing the number of parts also contributes to cost reduction, and since they are integrated, there are fewer dimensional errors between them.

Furthermore, by configuring the present invention as shown in claim 2, the drive means can be easily positioned, so it is possible to significantly improve assembly efficiency, and there is no accompanying cost increase. .

[Brief explanation of drawings]

The drawings show one embodiment embodying the present invention.
The figure is a longitudinal cross-sectional view of the print head of this embodiment, and Figure 2 is the first
A sectional view taken along the line A-A in the figure, and FIG. 3 is a partially exploded perspective view. In the figure, 1 is the electromagnetic device assembly, 2 is the printing wire assembly, and 5 is the electromagnetic device assembly.
13 is an electromagnetic device, 13 is a nose member, 17 is a support member, 17
17b is a protrusion, 17d is an opening, and 18 is an armature.

Claims (1)

[Claims] 1. A flange portion (17d) having a through hole (17d) in the center.
7) A nose body (13) that communicates with the through hole (17d) is integrally erected on one side, and a holding groove (17a) that extends radially from the through hole (17d) on the other side.
is formed, and a through hole (1
7e), an armature (18) inserted into each holding groove (17a) of the armature support member (2), and the nose body (13) passing through the center of the armature support member (2). A through hole (4f) is formed therein, and a driving means (1) having a driving portion (5) surrounding the armature (18) for driving the armature (18) through the through hole (17e). print head. 2. The print head according to claim 1, wherein the armature support member (2) is provided with positioning means (17b) for positioning with the drive means (1).