JPH02530A - wire dot printer - Google Patents

Abstract

PURPOSE:To improve heat sink effect and to maintain high assembly accuracy by covering the supporting member of a printer header unit with a metal cover, and attaching it to a carriage through the cover. CONSTITUTION:A wire guide member 8 is inserted with a groove 7 as a guide to the end of a wire nose 2 of a supporting member 1, a guide plate 12 is inserted fixedly to the intermediate of the nose 2, and a 2-layer printer head unit 20 is positioned by a joggle 4 at the side of a wire guide cylinder 3 on the member 1. A metal nose cover 13 is engaged from the end of the nose 2, positioned with an engaging hole 17 and a joggle 5, and a printer head unit 24 and the cover 13 are clamped with a clamping member 29. In this case, the member 8 is positioned fixedly at both ends 9a, 9b of a synthetic resin plate 9 protruding longitudinally of the bottom of the nose 2 in the elliptical hole 15 of the bottom of the cover 13. Thus, the integrated head is attached to a carriage through the bracket 18 of the cover 13.

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 attachment accuracy cannot be obtained. Additionally, due to the low thermal conductivity, there was a problem in that the heat generated inside could not be effectively released to the carriage.

[Purpose] The present invention was made in view of these problems, and its purpose is to utilize the excellent moldability of synthetic resin materials, the large rigidity and excellent thermal conductivity of metal, To provide a wire type dot printer which can mount a guide plate and a printer head with high precision and at the same time effectively emit internal heat.

[Means to achieve the purpose]

That is, the present invention aims to achieve this objective by -114
This printer head unit has a positioning support member,
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 wire nose protruding from the other end, and the bottom surface of the wire nose and the wire guide member In the wire type dot printer, 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 dot printer is 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 l in the drawings indicates a substantially disc-shaped plate made of a rigid resin material, with a wire nose 2 on the negative side and a wire guide tube 3 protruding on the other side. A two-layer printer head unit 20 positioned by the dowel 4 on the side of the wire guide cylinder 3 is supported by the supporting member.
．． 20 is placed. This printer head unit 2o includes a core block 2 including a plurality of coil cores 22.
1, two side yokes 23.24 in the shape of a plate and a disk placed on it, and radial slits placed on both side yokes 23.24 placed on the side yokes 23.24. It consists of a plurality of wire drive rods 25 arranged to face the coil core 21, and a presser foot (28) that clamps the shaft portion 26 of these wire drive rods 25. Omitted.

By the way, the wire nose 2, which is formed protrudingly from one surface of the support member 1, has a U-shaped cross section, and at its lower end, the left and right side walls 6.6 extend substantially to the lowest surface of the nose 2. On this inner surface, a wire guide member 8, which will be described later, is provided.
A groove 7 is formed for inserting the.

on the other hand. The wire guide member 8 described above is made up of three layers consisting of two synthetic resin plates 9 and 10 and a ceramic sheet 11 sandwiched between them. and place 2 on the bottom surface of nose 2.
One of the synthetic resin plates 9 is formed to have a length that protrudes from both ends in the insertion direction of the wire nose 2, and has a tip portion that protrudes from the nose 2 so that the planar shape of the lower surface of the nose 2 is oval in the inserted state. 9a is formed in an arc shape, and the front side is formed with a bulging head as a semicircular positioning stop 7 bar 9b corresponding to the width of the two noses 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 is a metal bottomed cover that covers the above wire nose 2 portion, and as shown in FIG.
An oblong hole 1 that conforms to the planar shape formed by
5 is formed, and the top thereof is integrally formed with a substantially circular plate 16 that abuts the lower surface of the support member 1, and is engaged with a dowel 5 protruding from the lower surface of the support member 1. An engagement hole 17 is bored therein.

In the figure, reference numeral 18 indicates a bracket protruding from the side surface of the nose cover 13 for attachment to a carriage (not shown), and 29 indicates 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 9.1o and a ceramic temporary plate 1 are placed on the tip of the wire nose 2 of the support member 1, using the groove 7 as a guide.
The wire guide member 8 consisting of
Position R using the dowel 4.

Next, a metal nose cover 13 is fitted from the tip of the wire nose 2, and the engagement hole 17 on the plate body 16 is engaged with the dowel 5 protruding from the lower surface of the support member I.
9 connects the printer head unit 24 and nose cover 1.
3, 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 on the bottom of the nose 2 coming into contact with the oblong hole 15 on the bottom of the nose cover 13. It is positioned and fixed there.

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

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

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

[Brief explanation of the drawing]

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. Support member Wire nose dowel Wire guide member Nose cover made of metal material Oval hole engagement hole Printer head unit Fig. 1

Claims (1)

[Claims] A wire guide member having a length protruding at least to both ends in the insertion direction of the wire nose is attached to the tip of the wire nose of a support member that has a positioning support member for the printer head unit on one side and a wire nose protruding from the other end. Further, 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.