JPH085187B2 - Dot printer head housing manufacturing method and dot printer head housing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a method for manufacturing a housing of a wire dot printer head used for OA equipment and the like.

(Prior Art) Generally, in a wire dot printer head, as shown in FIG. 10, a guide body (2), (3),
Hollow housing (5) constructed by mounting (4)
And a plurality of armature pins (8) in which the dot pins (7) are attached to the armature (6), and other actuating members including coil bodies (not shown). Then, for example, 24 amateur pins (8) are radially attached to the end plate (10) of the housing body (1), and the dot pins (7),
By passing through the guide bodies (2) and (3), the dot pins (7), ... arranged on the circumference are sequentially guided, and the guide holes (11) shown in Fig. 11 are provided. The guide body (4) at the tip of the dot pin (7), ...
Is projected to print a desired character.
The tip guide (4) is made of ceramics.

In the method of manufacturing the wire dot printer head having the above-described structure, the housing body (1) is manufactured by injection molding using a thermoplastic resin, and then a guide body (4) made of ceramics is provided at the tip thereof by a robot or manually. It was attached using an adhesive. The other guide bodies (2) and (3) are slidable by inserting the guide bodies (2) and (3) into the support grooves (12) and (13) provided in the housing body (1). Support. After that, other components such as a coil body (not shown) are attached and amateur pins are attached and assembled.

However, the above manufacturing method has various disadvantages. That is, (a) the manufacturing process of the housing main body (1) and the manufacturing process of the tip guide (4) are separate processes, so that the manufacturing efficiency is not good. (B) Adhesive work requires a skilled person, and education takes time. (C) Accuracy of ± 0.02mm for adhesion
Is required, and there is a limit to accuracy in humans and robots, and the flatness is not good because an adhesive is interposed. (D) When a robot is used, the shape of the tip of the housing is complicated, and improvement is desired.

(Problems to be Solved by the Invention) As described above, assembling the housing main body and the most advanced guide body by adhesion requires a large number of steps and is inefficient, and the accuracy is limited because it is assembled by an operator or a robot. And the flatness is poor.

The present invention has been made in order to eliminate the above-mentioned inconvenience, and an object of the present invention is to provide a method of manufacturing a housing which has high manufacturing efficiency and can maintain sufficient accuracy.

[Structure of Invention]

(Means and Actions for Solving Problems) The present invention relates to a housing main body formed in a hollow shape by injecting a resin into a mold and molding the resin, and a plurality of housing bodies installed in parallel in the hollow portion. From the one end side of the housing body of the housing having the guide body, insert a plurality of amateur pins composed of an armature and a dot pin, and sequentially insert into a plurality of holes formed in each of the plurality of guide bodies. In a method of manufacturing a housing of a dot printer head that guides the tips of the dot pins into a predetermined arrangement by going to the guide pin, the plurality of guide members are arranged on the most distal side in the insertion direction of the dot pins and the holes are formed. The step of positioning and holding the plate-shaped main plate portion and the guide body having the flange formed over the peripheral end portion of the main plate portion in the mold, And a step of injecting the resin around the flange of the guide body, and a step of solidifying the injected resin to form the housing body and fixing and holding the guide body in the housing body. A method of manufacturing a housing for a dot printer head, characterized in that a housing main body formed in a hollow shape by injecting a resin into a mold and molding the same is provided side by side in the hollow portion. From the one end side of the housing body of the housing having a plurality of attached guide bodies, insert a plurality of amateur pins composed of an armature and a dot pin, and insert into a plurality of holes formed in each of the plurality of guide bodies. In the housing of the dot printer head that guides the tips of the dot pins into a predetermined arrangement by inserting them one by one, The guide body arranged on the most distal side in the insertion direction of the dot pin of the guide body has a plate-shaped main plate portion in which the plurality of holes are formed and a flange portion over the peripheral end portion of the main plate portion. Further, when the housing body is resin-molded, the resin used for the resin molding is supplied around the collar portion positioned in the mold in advance to be insert-molded and fixed to the housing body. To obtain a housing for a dot printer head, which is characterized in that
As a result, productivity can be improved (manufacturing efficiency can be improved), and planar accuracy can be further improved.

(Example) Hereinafter, details of the present invention will be described by way of an example with reference to FIGS. 1 to 9.

The housing main body (21) of the housing (20) manufactured according to the present embodiment has substantially the same configuration as the conventional one, but is different in the portion to which the most advanced guide body is mounted. 8 and 9 show a state-of-the-art guide body (22), which is a fixing collar part (24) around a main plate part (23) provided with guide holes (11), .... Is provided.

A support frame (26) is provided on the disk-shaped end plate (25) so as to project, as in the conventional example. Support grooves (27) and (28) are provided on the inside of this, and guide bodies (29) and (30) similar to those in the conventional example are inserted therein. The support groove (31) in which the most advanced guide body (22) is provided at the end is provided with a collar (2
It has a T-groove (32) with a support (31) for inserting 4). The state where this guide body (22) is embedded is the fourth
It is shown enlarged in FIGS.

Next, the manufacturing method of this embodiment will be described. FIG. 7 shows an injection molding die. In the figure, a thick line (41) is a release surface between the fixed-side mold plate (42) and the movable-side mold plate (43) that moves up and down. (44) is a core that is inserted and removed in the direction perpendicular to the paper surface of FIG. First, the four corners (47) of the ceramic guide body (22) are placed on the guide pins (46), which are erected at the four corners of the concave portion which forms the cavity (45) of the fixed-side template (42), and are positioned. To hold. Then, the two molds are combined and the thermoplastic resin is injected around the cavity (45), that is, the ceramic guide body (22) through the runner gate (48) to mold the housing body (21) and guide body. (22) is fixed and held by insert molding (At this time,
The part where the core (44) is removed becomes hollow). The shaded area in the upper right of FIGS. 4 to 6 indicates the guide body (2
In 2), the embedded state is shown enlarged.

Although the guide body (22) is positioned at the four corners in this embodiment, it may be positioned at the four sides. Further, according to the above-described embodiment, since the periphery of the guide body (the periphery of the collar portion) is fixed by the resin, for example, a fine hole for injecting the resin into the guide body is processed, Compared with the method of injecting and fixing resin into the holes, it is possible to save the labor of processing the fine holes in the guide body, which is effective in reducing the manufacturing cost of the guide body.

〔The invention's effect〕

As described above, according to the manufacturing method of the present invention, the guide body is insert-molded when the housing body is molded by injection molding, so that the guide body is positioned with high accuracy and no adhesive layer is interposed. Therefore, the flatness is remarkably improved. Further, according to the housing of the dot printer head of the present invention, the guide body can be easily positioned because the guide body is positioned with high accuracy and the guide body is firmly held by insert molding from its peripheral direction. Can be fixedly held. Further, since the bonding step is omitted, the manufacturing efficiency is improved, and an excellent effect such that a skilled worker is not required is exhibited.

[Brief description of drawings]

FIG. 1 is a plan view of a housing body manufactured by the method of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a sectional view taken along line III-III of FIG. 2, and FIG. Fig. 5 is an enlarged plan view showing the vicinity of the guide body of the housing insert-molded by the method, Fig. 5 is a sectional view taken along line VV in Fig. 4, and Fig. 6 is VI- in Fig. 4 similarly. A cross-sectional view taken along line VI, FIG. 7 is a cross-sectional view showing an essential part of an injection molding die for explaining insert molding of the method of the present invention, and FIG. 8 is a plan view of a guide body used in the above-mentioned embodiment, ninth. The figure is also a front view, FIG. 10 is a sectional view of a conventional housing, FIG. 11 is a plan view of a conventional guide body, and FIG. 12 is a front view of the same. (6) …… Amateur, (7) …… Dot pin, (8) …… Amateur pin, (20) …… Housing, (21) …… Housing body, (29), (30), (32)…
… Guide body.

Claims (2)

[Claims] 1. A housing main body of a housing having a housing main body formed in a hollow shape by injecting a resin into a mold and molding, and a plurality of guide bodies mounted in parallel in the hollow portion. Insert a plurality of amateur pins composed of an amateur and a dot pin from one end side, and insert them into a plurality of holes formed in each of the plurality of guide bodies one by one, thereby setting the tip of the dot pin to a predetermined position. In a method of manufacturing a housing of a dot printer head that leads to an array, a plate-shaped main plate portion that is arranged on the most distal side in the insertion direction of the dot pin among the plurality of guide bodies and has the plurality of holes, and the main plate portion. A step of positioning and holding a guide body in which a flange portion is formed over the peripheral end portion of the inside of the mold, and the tree member around the flange portion of the positioning and held guide body. And a step of solidifying the injected resin to form the housing body and fixing and holding the guide body to the housing body. . 2. A housing main body of a housing having a housing main body formed in a hollow shape by injecting a resin into a mold and molding, and a plurality of guide bodies mounted side by side in the hollow portion. Insert a plurality of amateur pins composed of an amateur and a dot pin from one end side, and insert them into a plurality of holes formed in each of the plurality of guide bodies one by one, thereby setting the tip of the dot pin to a predetermined position. In the housing of the dot printer head leading to the arrangement, the guide body arranged on the most distal side in the insertion direction of the dot pin among the plurality of guide bodies is a plate-shaped main plate portion having the plurality of holes and the main plate. Has a brim portion over the peripheral end of the portion, and when the housing body is resin-molded, the resin used for this resin molding is previously positioned in the mold. The housing of the dot printer head is insert molded, characterized in that it is fixed to the housing body by supplying around Kitsuba portion.