JPH0369712B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wire-type dot printer, and more particularly to a nose portion of a wire-type dot printer.

[Prior art]

In wire-type dot printers, the support member for holding the wire drive mechanism and guiding the print wire to the tip of the nose has a complicated shape, so it is usually molded from a synthetic resin material.

For this reason, conventional support members lack rigidity, and even if the wire guide member is attached to the tip of the nose or the printer head is attached to the carriage via this support member, sufficient mounting accuracy cannot be obtained. However, due to the low thermal conductivity, the heat generated internally could not be effectively released to the carriage.

〔the purpose〕

The present invention was made in view of such problems,
The purpose of this is to take advantage of the excellent moldability of synthetic resin and the high rigidity and excellent thermal conductivity of metal to mount the guide plate and printer head with high precision while simultaneously reducing the internal heat. To provide a wire type dot printer that can be effectively transported.

[Means to achieve the purpose]

That is, the present invention has the following objectives:
A wire guide member having a length protruding at least to both ends in the insertion direction of the wire nose is inserted into the tip of the wire nose of a support member having a positioning support member for the printer head unit on one side and a wire nose protruding from the other end. As well as wearing
A wire-type dot printer includes a cover member made of a metal material and having a hole formed in the bottom plate corresponding to the planar shape formed by the bottom surface of the wire nose and the wire guide member, and attached to the support member from above the wire nose. .

〔Example〕

Therefore, details of the present invention will be explained below based on illustrated embodiments.

Each of the drawings shows an embodiment of the present invention, and the reference numeral 1 in the drawings indicates a wire nose 2 on one side.
is a substantially disc-shaped support member made of a rigid resin material with a wire guide tube 3 formed protrudingly on the other side, and on the wire guide tube 3 side, there is a wire guide tube 3 positioned by a dowel 4.
Layer printer head units 20, 20 are mounted. This printer head unit 20 is
Core block 21 with multiple coil cores 22
and two side yokes 23 and 24 in the shape of a plate and a disk placed on the side yokes 23 and 24, and the above-mentioned It consists of a plurality of wire drive rods 25 arranged to face the coil core 21 and a presser plate 28 that clamps the shaft portions 26 of these wire drive rods 25, but a detailed explanation thereof will be omitted.

By the way, the wire nose 2 formed protrudingly from one surface of the support member 1 is formed in a U-shape in cross section.
Further, at its lower end, left and right side walls 6, 6 extend substantially to the lowest surface position of the nose 2, and on this inner surface,
A groove 7 is formed into which a wire guide member 8, which will be described later, is inserted.

on the other hand. The wire guide member 8 described above is composed of three layers including two synthetic resin plates 9 and 10 and a ceramic plate 11 sandwiched between them.
One of the synthetic resin plates 9 located at the bottom surface of the
The distal end 9a protruding from the nose 2 is formed in an arc shape so that it protrudes from both ends in the insertion direction of the wire nose 2, and the planar shape of the lower surface of the nose 2 is oval in the inserted state. has a bulging head as a semicircular positioning stopper 9b corresponding to the width of the nose 2.

Note that reference numeral 12 in the figure indicates a guide plate for guiding the printed wire 27 to the tip of the wire nose 2.

On the other hand, the reference numeral 13 in the figure indicates the wire nose 2 described above.
It is a metal bottomed cover that covers the area, and the bottom surface 14 has a wire nose 2 as shown in FIG.
An oval hole 15 is formed in accordance with the planar shape formed by the lower surface of the support member 1 and the synthetic resin plate 9, and the top thereof is integrally formed with a substantially circular plate 16 that abuts the lower surface of the support member 1. The support member 1 has an engagement hole 17 therein which engages with a dowel 5 protruding from the lower surface of the support member 1.

In the figure, reference numeral 18 denotes a bracket protruding from the side surface of the nose cover 13 for attachment to a carriage (not shown), and 29 denotes a fastening member for fastening the nose cover 13 to the presser plate 28 of the printer head unit 20. are shown respectively.

Next, the assembly of the above-mentioned device will be explained.

First, two synthetic resin plates 9 and 10 are attached to the tip of the wire nose 2 of the support member 1 using the groove 7 as a guide.
A wire guide member 8 consisting of a wire guide member 8 and a ceramic plate 11 is inserted, and a guide plate 12 is similarly inserted and fixed in the middle of the nose 2. Two layers of printer head units 20, 20 are doweled on top of the support member 1. 4. Position and place it.

Next, the metal nose cover 13 is fitted from the tip of the wire nose 2, the engagement hole 17 on the plate body 16 is engaged with the dowel 5 protruding from the lower surface of the support member 1, and the printer head is connected by the fastening member 29. When the unit 24 and the nose cover 13 are fastened together, the wire guide member 8 inserted into the tip of the wire nose 2 has both ends 9a and 9b of the synthetic resin plate 9 protruding in the longitudinal direction of the bottom surface of the nose 2 attached to the nose cover 13.
It contacts the oblong hole 15 on the bottom and is positioned and fixed there.

Therefore, if the printer head integrated in this way is finally attached to a carriage (not shown) via the bracket 18 of the nose cover 13, the printer head will not be misaligned despite vibrations during printing. It is firmly held without causing any damage.

〔effect〕

As described above, according to the present invention, the support member that supports the printer head unit is covered with a cover member made of a metal material, and the printer head is attached to the carriage via this cover member. The rigidity of the metal material allows the printer head to be accurately positioned and fixed in the carriage, and at the same time, the excellent thermal conductivity of the metal material can be used to prevent heat generated by the movement of the print wire from the nose and heat sink. The heat inside the head, which is transmitted to the cover member via the cover member, can be efficiently released to the carriage, thereby increasing the heat dissipation effect.

Moreover, since the tip of the wire head portion and both ends of the wire guide member inserted into this portion are fitted into the hole provided in the bottom plate of the cover member, positioning of the tip of the cover member by these,
The wire guide member can be positioned and held by the hole at the same time, and furthermore, the cover member can be attached without the need for fixing members such as screws, which greatly simplifies the assembly work. .

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an apparatus showing an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing essential parts of the same apparatus. 1... Support member, 2... Wire nose, 4, 5
... Dowel, 8 ... Wire guide member 13 ... Nose cover made of metal material, 15 ... Oval hole, 1
7...Engagement hole, 20...Printer head unit.

Claims (1)

[Claims] 1. A support member having a printer head unit positioning support member on one side and a wire nose protruding from the other end is provided with a wire guide member having a length protruding at least to both ends in the insertion direction of the wire nose at the tip of the wire nose. At the same time, a cover member made of a metal material and having a hole formed in the bottom plate corresponding to the planar shape formed by the bottom surface of the wire nose and the wire guide member is attached to the support member from above the upper wire nose. A wire-type dot printer featuring the following.