JPS62212169A - Wire head guide device for dot printer - Google Patents

Abstract

PURPOSE:To suppress abrasion and maintain printing quality for a long time, by a construction wherein bearing parts for guiding a plurality of wire heads opposed to a platen are constituted of bearings in the form of a plurality of oblique holes extended along the wire heads. CONSTITUTION:Bearing parts 9, 11 for guiding a plurality of wire heads 8 opposed to a platen 1 are constituted of bearings in the form of a plurality of oblique holes extended along the wire heads 8. Every time the wire head 8 is reciprocated to print a paper, it is caught by an ink ribbon, and a radial load is exerted on a guide part 2 for a tip part of the wire head 8. Therefore, the bearing part 9 simultaneously receives a load arising from the reciprocation of the wire head 8 and the radial load. However, since the bearing part alpha9 and the wire head 8 make contact with each other over the entire surface for contact, the load exerted on the bearing part alpha9 per unit area is low, and abrasion is slight.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a wire head guide device for a dot printer.

[Conventional technology]

As shown in FIG. 2 as a structure of a conventional wire head guide device for a dot printer, the guide at the tip of the wire-rad guide device has a tip guide portion α15. Tip guide part h
16. It is separated into three parts including the tip guide part 17, and furthermore, since the bearing part C21 is a hole perpendicular to the axis of the platen,
The wire head 8 was guided by sequentially shifting the positions of the bearings.

In addition, the middle part of the wire head guide device has a nose 25.
Intermediate guide part α18 fitted in. Intermediate guide part b1
9. As shown in the intermediate guide portion c20, the bearing portion d22 is a hole perpendicular to the platen.

Wire head guide components are usually made of plastic.

[Problem that the invention seeks to solve]

However, the wire head guide device described above has a large number of patented parts including three parts even in the guide at the tip, and the guide part of the wire head 8 arranged diagonally is shown in the bearing part c21 and the bearing part d. Similarly, the edge α23 of the bearing portion and the edge h24 of the bearing portion serve as de facto guides. Therefore, if the wire head 8 is reciprocated in the axial direction at high speed, the edge α23 of the bearing and the edge b24 of the bearing will wear out because the guide portion is made of plastic, and the hole diameter of the bearing will become larger, causing printing problems. There was a problem with poor alignment. or,
By changing the material of the wire head guide device to ceramic, etc., which does not wear, wear of the guide device can be prevented, but the wire head guide device becomes extremely expensive.
There was a problem in that the wire head 8 was scraped and thinned, resulting in poor print quality.

The present invention is intended to solve these problems, and its purpose is to provide a wire head guide with less wear on the wire head guide, no wear on the mating wire head 8, and a lower cost. Our goal is to provide the following.

[Means to solve the problem]

The wire hent guide device for a dot printer of the present invention has one end of each of the plurality of wire heads 8 arranged in one or more rows to face the platen 1, and the other end of each wire head 8 arranged on the same circle or concentrically. In a dot printer wire head guide device disposed above and engaged with a drive source, a bearing portion 9.11 that guides a plurality of wire heads 8 facing the platen 1 is provided with a bearing portion 9.11 that guides a plurality of wire heads 8 facing the platen 1. The bearing is characterized by a diagonal hole shape.

〔Example〕

FIG. 1 is a plan view of a wire head guide device for a dot printer according to an embodiment of the present invention. 1 is a platen, which is a receiving surface of the wire head 8 during printing. 2
is the tip guide part of the wire head guide device,
Printing quality is determined by the shape accuracy of this part. 3 is the nose, and the wire head 8. This is a frame to which coils, wire head guide devices, etc. are attached. 4 is a guide bottle located on the nose 3, and a to which the tip guide portion 2 is fixed.
Reference numeral 5 denotes an intermediate guide portion α, which guides the intermediate portion of the wire head. The intermediate guide portion 6 and the intermediate guide C 7 have similar functions.

8 is a wire head that makes a reciprocating motion in the axial direction and prints. 9, 10.11 are listed in Figure 3. Reference numeral 9 denotes a bearing portion α, which forms a guide hole along the obliquely arranged wire head 8.

Reference numeral 10 denotes a conical surface at the entrance of the bearing portion α9 of the tip guide portion 2, which allows the wire head 8 to enter easily. 1
Reference numeral 1 denotes a bearing portion of the intermediate guide portion b6, which has the shape of an oblique hole along the wire head.

Reference numeral 12 is shown in FIGS. 4 and 5, and the guide pin 4 on the nose 1 is fitted into the guide pin hole of the tip guide part 2, and the guide pin 4 is caulked to fix the tip guide part 2. Reference numeral 13 denotes a platen-side surface of the tip guide portion 2, on which the bearing portions α of the wire head 8 are substantially aligned. 14 is a surface of the tip guide portion 2 on the coil side. Wire head 8 coil bypass! l l+ I Tomi-Logo Condolence 44+ L-0
The arrangement of the bearing parts α9 on the coil side surface of the zeid part 2 is in a zigzag pattern as shown in FIG. 5.

As shown in FIGS. 1 and 3, the tip guide portion 2 on the platen side of the wire head guide device of a dot printer has a bearing portion ct9 shaped to follow the diagonally arranged wire heads. Therefore, the tip guide portion 2
only requires one part. Further, an ink ribbon and paper to be printed (both parts are not shown) are interposed between the tip guide portion 2 and the platen 1. The ink ribbon is moving in the axial direction of the platen 1. Therefore, when the wire head 8 reciprocates and prints on paper, the wire head 8 is always caught on the ink ribbon, and a radial load is applied to the tip guide portion 2 of the wire head 8. Therefore, the bearing part α9 receives the speed and radial load of the reciprocating wire head 8 at the same time, but since the bearing part α9 and the wire head 8 are in contact with each other over the entire surface, the load per unit area that the bearing part α9 receives is small. The wear is also small. The above description can be applied to the intermediate guide part α5 and the following intermediate guide parts, and the bearing part b1
No. 1 wear is small. The fact that the wear in the bearing part α9 of the tip guide part 2 and the bearing part bi1 of the intermediate guide part is small is that
This means that the backlash between the wire head 8 and the wire head guide device is small, and the IJ hook printing quality produced by the reciprocating movement of the wire head 8 is maintained over a long period of time.

〔Effect of the invention〕

As described above, according to the present invention, the wire head guide device of a dot printer has less wear and durability, and has the effect of maintaining printing quality over a long period of time. Furthermore, since the number of parts of the wire head guide device is reduced,
This has the effect of reducing costs by reducing the number of parts and reducing assembly man-hours.

[Brief explanation of drawings]

FIG. 1 is a plan view of a wire head guide device for a dot printer according to the present invention. FIG. 2 is a plan view of a wire head guide device for a conventional dot printer. FIG. 3 is an elevational view of a wire head guide device for a dot printer according to the present invention. FIG. 4 is a side view of the tip guide portion of the wire head guide device according to the present invention, seen from the platen side. FIG. 5 is a side view of the tip guide portion of the wire head guide device according to the present invention, seen from the coil side. 1...Platen 2...Tip guide section 3...Nose 4...Guide pin 5...・・・・・・Intermediate guide part α 6・・・・・・・・・Intermediate guide part b 7・・・・・・Intermediate guide part C 8・・・・・・・・・Wire Head 9... Bearing part α 10... Conical surface 11... Bearing part b 12... Guide bottle hole 13... Tip guide part platen side surface 14...
...Tip guide part coil side surface 15...Tip guide part α 16...Tip guide part b 17...Tip guide part C 18... - Intermediate guide section α 19... Intermediate guide section b 20... Intermediate guide section C 21... Bearing section C 22... Bearing section d 23... ...Edge α of the bearing part 24 ...Edge b of the bearing part 25 ......More than /-

Claims (1)

[Claims] A dot printer in which one end of a plurality of wire heads is arranged in one or more rows to face a platen, and the other ends of the wire heads are arranged on the same circle or concentrically and engaged with a drive source. In the wire head guide device of a dot printer, the bearing portion for guiding the plurality of wire heads facing the platen is a plurality of oblique hole-shaped bearings along the wire heads. .