JP2722537B2 - Wire dot print head - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a wire dot type print head.

[Prior Art] First, an example of a conventional wire dot type print head is described in Section 11
This will be briefly described with reference to the drawings.

The print head includes a plurality of (for example, 24) armatures 52 each having a print wire 51 attached to a tip thereof, an electromagnetic drive mechanism 53 for driving the armatures 52, and a housing 54 for accommodating the armatures 53. Its housing
Nose body that is attached to 54 and houses the printing wire 51
A suitable number (three in the figure) of a nose 55 and guide holes 56a, 57a, 58a attached to the nose portion 55a of the nose body 55 and guiding the advance and retreat of the printing wire 51 accompanying the swing of the armature 52 Wire guides 56, 57, 58. The housing 54 includes a front yoke 54F and a rear yoke 5
4R. Armature 5 on front yoke 54F
2 is supported via a spring member 60. Such a print head is disclosed in, for example, Japanese Patent Application Laid-Open No. 63-35351. Also, as other print heads,
For example, it is disclosed in JP-A-58-67471 and JP-A-60-58871.

When assembling the print head as described above, usually
As shown in FIG. 12, the front yoke 54
The armature 52 is supported by the F through a spring member 60, and the nose body 55 is mounted on the front yoke 54F by the spring member 60.
And the nose body 55
After the wire guides 58, 57, 56 are attached in advance, the printing wire 51 is connected to the respective guide holes 56a, 56a of the respective wire guides 56, 57, 58.
57a, 58a, and then the rear end of the printing wire 51 is brazed to the end of the armature 52. After that, the rear yoke 54R having the electromagnetic drive mechanism 53
Is mounted on the front yoke 54F.

[Problems to be Solved by the Invention] However, in the conventional wire dot type print head described above, the wire guides 56, 57, 58 are provided in the mounting grooves 66, 67, 69 formed inside the nose body 55. After being fitted and fixed in a pre-positioned state before the printing wire 51 is inserted, the guide holes 56a, 57a, 58 of the wire guides 56, 57, 58 are formed.
Since the printing wire 51 is inserted through a, depending on the place where the printing wire 51 is inserted, the guide holes 57a and 58a are difficult to see particularly in the wire guides 57 and 58, and the insertion is very difficult. It takes a long time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to make it possible to easily insert a print wire while checking a wire guide hole in a print head, and to assemble a print head. The aim is to reduce the time.

Means for Solving the Problems To achieve this object, an invention according to claim 1 includes a plurality of armatures each having a print wire attached to a tip thereof, an electromagnetic drive mechanism for driving the armature, A housing accommodating the armature, a nose body attached to the housing and accommodating the printing wire;
A wire guide having a guide hole attached to the nose body and having a guide hole for guiding advance and retreat of the print wire accompanying the swing of the armature, wherein the wire guide is inserted into a side wall of the nose body. A groove extending from a position to a mounting position of the wire guide is formed, and the wire guide is a wire dot type print head, characterized in that an engagement piece engageable with the groove is formed. Further, the invention according to claim 2 includes a plurality of armatures having a print wire attached to a tip thereof, an electric drive mechanism for driving the armature, a housing for accommodating the armature, and the print wire attached to the housing. A nose body for accommodating the nose body, and a printing wire attached to the nose body and advancing of the printing wire accompanying the swing of the armature. A wire guide having a guide hole for guiding movement, wherein an engagement groove is formed at a mounting position of the wire guide on a side wall of the nose body, and a long piece of the wire guide is provided. When the length of the groove is a and the length of the short piece is b, the inner diameter c and the outer diameter d of the engagement groove are set so as to satisfy the relationship of b <c <a <d. This is a wire dot type print head.

According to the present invention having the above-described configuration, the printing wire can be inserted into the guide hole of the single wire guide before being attached to the nose body. Insertion work can be performed.

EXAMPLES Hereinafter, typical examples embodying the present invention will be described.

First Embodiment First, a first embodiment will be described with reference to FIGS.

The wire dot print head includes a plurality of (for example, 24) armatures 2 each having a print wire 1 attached to a tip thereof, an electromagnetic drive mechanism 3 mainly including an electromagnetic coil for driving the armature 2, and the armature. 2, a nose body 5 attached to the housing 4 for accommodating the printing wire 1, and a nose body 5 attached to the nose body 5 to move the printing wire 1 forward and backward with the swing of the armature 2. Guide holes 6a, 7a, 8a for guiding
(3 in this example) wire guides 6, 7, 8
And

The housing 4 includes a front yoke 4F and a rear yoke 4R. The armature 2 is supported by the front yoke 4F via a spring member 10 made of a leaf spring. Nose body 5
Has a mounting flange 5b formed on the rear end surface of the square tubular nose portion 5a.

In the figure, reference numeral 11 denotes a permanent magnet interposed with a spacer 13 between the front yoke 4F and the rear yoke 4R, 12 denotes a tip guide attached to the tip of the cylindrical portion 5a of the nose body 5,
Reference numeral 14 denotes spacers interposed between the mounting flange 5b of the nose body 5 and the spring member 10, respectively.

The print head as described above is disclosed in, for example,
Since it is disclosed in Japanese Patent No. 35351, a detailed description thereof will be omitted.

On the left and right side walls of the nose portion 5a of the nose body 5, three grooves 16, 17, 18 are provided.
It is formed in parallel from the end face on the 5b side (the right end face in the figure) toward the front (see FIG. 3). The length of each of the grooves 16, 17, 18 is formed so as to gradually increase in the order of the upper groove 16, the interruption groove 17, and the lower groove 18. Each groove 16, 17, 18
Correspond to the mounting positions of the respective wire guides 6, 7, 8.

As shown in FIGS. 4 to 6, the wire guides 6, 7, and 8 each have a rectangular plate shape that can be fitted into the nose body 5 and have a side edge of the nose body 5 on the side edge thereof. Grooves 16,17,
Engagement pieces 20, 21, 22 corresponding to 18 are projected, respectively. That is, the rear wire guide 6 is connected to the upper groove 16.
The center wire guide 7 has an engaging piece 21 (see FIG. 5) corresponding to the interrupted groove 17 and the front wire guide 8 has a lower wire. An engagement piece 22 (see FIG. 4) corresponding to the groove 18 is formed,
In addition, each guide hole 6a, 7a, 8a of each wire guide 6, 7, 8 is
The guide holes 6a of the rear wire guide 6 are arranged in a substantially circular shape, and the guide holes 7a of the central wire guide 7 are substantially the same as the number of the armatures 2 (24 in this example). The guide holes 8a of the front wire guide 8 are arranged side by side in parallel to the left and right.

Next, the assembling method of the above-mentioned wire dot type print head will be described. First, as shown by a solid line in FIG. 1, the print wire 1 is attached to the armature 2 by brazing or the like, and the armature 2 is Attach to front yoke 4F via.

Next, a guide wire is provided in the printing wire 1 in the order of the rear wire guide 6, the center wire guide 7, and the front wire guide 8.
Insert 6a, 7a and 8a (see the two-dot chain line in FIG. 1).

Thereafter, the engaging piece 22 of the front wire guide 8, the engaging piece 21 of the central wire guide 7, and the engaging piece 20 of the rear wire guide 6
, The wire guides 8, 7, and 6 are slid, and the respective wire grooves 8, 17, 6 are slid.
By bringing the engaging pieces 22, 21, 20 into contact with the tips of the 6, the respective wire guides 8, 7, 6 are respectively positioned at predetermined positions, and are fixed to the positions by bonding with an adhesive. Is done. Note that the adhesive is applied to the tips of the grooves 16, 17, 18 of the nose body 5 before the wire guides 6, 7, 8 are assembled. The leading end of each printing wire 1 is then inserted into a guide hole of a leading end guide 12 that is fixed to the tubular portion 5a in advance. Note that the tip guide 12 can also be inserted into the tubular portion 5a together with the wire guides 6, 7, and 8 and adhered to the printing wire 1 first. (The same applies to the following embodiments.) At the same time, the front yoke 4F and the nose body 5 are integrally assembled together with the spring member 10 and the spacer 14,
Further, a rear yoke 4R having the electromagnetic drive mechanism 3 is assembled to the front yoke 4F together with the permanent magnet 11 and the spacer 13 (see FIG. 2).

According to the above-described wire dot print head, since the print wire 1 can be inserted into the guide holes 6a, 7a, 8a of the single wire guides 6, 7, 8 before being attached to the nose body 5, the wire guide 6 , 7, 8 while checking the guide holes 6a, 7a, 8a.

Therefore, the wire guides 6, 7, 8
The print wire 1 can be easily inserted into the print head, the assemblability of the print head is improved, and the cost is reduced.

Second Embodiment Next, a second embodiment will be described with reference to FIGS. In this embodiment, since a part of the first embodiment, that is, the engagement structure between the wire guide and the nose body is changed, the same portions as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Are omitted, and only different portions will be described in detail. In addition, the wire guide of this example is two pieces of the front wire guide 8 and the rear wire guide 6.

The nose body 5 has an opening on one side (lower side in this example) of the nose portion 5a. Front and rear engagement grooves 41 and 40 are formed on the left and right side walls of the nose body 5 in parallel with each other.

Each of the wire guides 6 and 8 is formed in a substantially rectangular plate shape, and the vertical and horizontal dimensions are set as follows. That is, as shown in FIG. 10, the length of the long side of the wire guide 6 (8) is a, the length of the short side thereof is b,
Assuming that the distance between the side walls of the nose portion 5a is c and the distance between the bottom surfaces of the engagement grooves 40 (41) is d, the relationship of a> c b <ca <d is set. Further, the corners of the wire guide 6 (8) are chamfered in the engaging groove 40 (41) so that the wire guide can rotate about the center thereof as a rotation center, and each length thereof is a and b are as long as possible.

Next, the assembling method of the above-mentioned wire dot type print head will be described.
As shown by the solid line in FIG.
And the armature 2 is attached to the front yoke 4F via the spring member 10.

Next, the guide holes 6a and 8a are inserted through the print wire 1 in the order of the rear wire guide 6 and the front wire guide 8 (the seventh hole).
(See the two-dot chain line in the figure.)

Thereafter, with the long side of the wire guides 6, 8 facing the side wall of the nose body 5, the front wire guide 8, and the rear wire guide 6 are interposed in the nose portion 5a of the nose body 5 in this order, and each wire guide 8 At positions corresponding to the engagement grooves 41, 40,
By rotating the entire unit of the front yoke 4F and the armature 2 by a predetermined angle, that is, 90 °, and by rotating the wire guides 6 and 8 about their axes, both ends of the wire guides 6 and 8 are engaged with the engagement grooves. The wire guides 6, 8 are respectively engaged with the wire guides 40, 41, so that the wire guides 6, 8 are set at predetermined positions in a positioned state. Then, the two wire guides 6, 8 are bonded to the engagement grooves 40, 41 via an adhesive. Note that the adhesive is applied to a predetermined portion from the opening of the nose body 5.

At the same time, the front yoke 4F and the nose body 5 are integrally assembled together with the spring member 10 and the spacer 14, and the rear yoke 4R having the electromagnetic driving mechanism 3 is provided with the permanent magnet 11 and the spacer 13 on the front yoke 4F. (See FIG. 8).

According to the above-described method of assembling the print head, the same operation and effect as those of the first embodiment can be obtained, and when the wire guides 6, 8 are moved relative to the nose body 5, the wire guides 6, 8 can be moved.
Is not brought into contact with the nose body 5, so that the arrangement and movement can be easily performed.

It should be noted that the present invention is not limited to the above embodiment, and can be modified without departing from the spirit of the present invention.

Various types of print heads have been proposed. For example, the print head without the front yoke in the above-described embodiment or the print head having a different shape and arrangement form of the spring member may be used. On the other hand, the present invention can be applied to a wire dot type print head having a structure in which a print wire attached to an armature is inserted.

[Effects of the Invention] As is clear from the above, according to the present invention, before attaching the wire guide to the nose body, the printing wire attached to the armature is inserted into the guide hole of the wire guide, and thereafter, By attaching the wire guide to the nose body, the printing wire can be inserted into the guide hole of the single wire guide, so that the printing wire can be inserted while checking the guide hole of the wire guide. As compared with the conventional print head, the work of inserting the print wire can be performed easily, the assemblability of the print head can be improved, and the cost can be reduced.

[Brief description of the drawings]

1 to 6 show a first embodiment of the present invention. FIG. 1 is an explanatory view for explaining an assembling state of a print head, FIG. 2 is a sectional view of a print head, and FIG. 4 to 6 are front views showing respective wire guides. 7 to 10 show a second embodiment of the present invention, and FIG. 7 is an explanatory view for explaining an assembled state of a print head.
FIG. 8 is a sectional view of the print head, and FIG. 9 is XI-XI of FIG.
FIG. 10 is a sectional view showing the relationship between the wire guide and the nose body. Figs. 11 and 12 show a conventional example.
FIG. 11 is a cross-sectional view of the print head, and FIG. 12 is an explanatory diagram for explaining an assembled state of the print head. 1 Print wire 2 Armature 5 Nose body 6,7,8 Wire guide

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-56-37173 (JP, A) JP-A-61-286158 (JP, A) JP-A-62-263067 (JP, A) JP-A-2- 80255 (JP, A) Fully open 1979-86218 (JP, U) Fully open, 56-82272 (JP, U) Fully open, 61-28522 (JP, U)

Claims (2)

(57) [Claims] 1. A plurality of armatures each having a print wire attached to a tip thereof, an electromagnetic drive mechanism for driving the armature, a housing accommodating the armature, and a nose body attached to the housing and accommodating the print wire. A wire guide attached to the nose body and having a guide hole for guiding advance and retreat of the print wire accompanying the swing of the armature, wherein a side wall of the nose body includes a wire guide. A wire groove extending from the insertion position of the wire guide to the mounting position of the wire guide, and an engagement piece capable of engaging with the groove is formed in the wire guide. 2. An armature having a print wire attached to a tip thereof, an electromagnetic drive mechanism for driving the armature, a housing for accommodating the armature, and a nose body attached to the housing and accommodating the print wire. And a wire guide attached to the nose body and having a guide hole for guiding advance and retreat of the printing wire accompanying the swing of the armature, wherein the side wall of the nose body includes the wire. An engagement groove is formed at the mounting position of the guide, and when the length of the long piece of the wire guide is a and the length of the short piece is b, the inner diameter c and the outer diameter d of the engagement groove are b < A wire dot type print head characterized by satisfying a relationship of c <a <d.