JPH0617547Y2 - Print head of wire type dot printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a print head of a wire dot printer used as an output device of an information processing apparatus.

[Conventional technology]

Since the wire guide member attached to the wire nose part is not fixed except for the tip guide, it is extremely difficult to drop out when assembling the wire and to guide many print wires to the tip of the nose accurately and easily with the required positional relationship. There arises a problem that it becomes difficult, and further, a guide is moved due to a wire side pressure at the time of wire printing, the wire is bent, and a printing force is lost.

[Problems to be solved by the invention]

The present invention has been made in view of such a problem, and its purpose is to accurately position and fasten a wire guide member having high wear resistance so that the print wire is accurately and easily aimed at the tip of the nose. (EN) Provided is a wire-type dot printer which can be guided by the above method and can prevent the print wire from bending and can obtain high printing quality.

[Means for solving problems]

That is, the print head of the wire type dot printer according to the present invention has a plurality of holes for slidably guiding the print wire, a plate-shaped wire guide having minute projections on the side surface, and the wire guide. And a wire nose portion made of an elastic member provided with a locking portion with which the small protrusions of the inserted wire guide are engaged, and when the wire guide is inserted, It is characterized in that, after the minute projections spread the guide groove, the minute projections are fitted to the restored locking portions.

〔Example〕

The details of the present invention will be described below based on the illustrated embodiments.

FIG. 1 shows an embodiment of a wire dot printer according to the present invention, in which reference numeral 1 denotes a nose 1a for holding wire guides 2 and 11 to be described later and a spring 1 to be described later.
1d for inserting 5 and a guide portion 1 for a wire 10 described later
It is a guide holder described later in which e is integrally formed. On this inner surface, a shallow bottomed cylindrical core block 3 made of a magnetic material and positioned by the projection 1f is integrally fixed. The core block 3 serves to attract the drive lever 7 in cooperation with the bottomed cylindrical yoke 5 and the disk-shaped side yoke 6, and has a plurality of coils 4 wound around the inner surface thereof. The core 3a is formed so as to project in a ring shape. A bottomed cylindrical yoke 5 and a disk-shaped side yoke 6 made of a magnetic material are placed thereon, and a shaft 9 for penetrating and holding a wire driving lever 7 engaging with a wire 10 is provided. The holding plate 13 is placed on the yoke 5 and pivotally fixed by a shaft supporting lateral groove 6a provided on the side yoke 6, and a holding plate 13 is placed thereon so as to cover them. They are integrally connected by a fastening plate 14 suspended between 13 and the nose cover 16.

Reference numeral 17 in the figure denotes a printed circuit board fixed to the terminals of the exciting coil 4 via the bottomed cylindrical core block 3.

Further, the drive lever 7 is constantly urged to the left in the figure by the spring 15 interposed between the drive lever 7 and the tubular portion 1d of the guide holder 1.

In the printer thus configured, one or a plurality of exciting coils 4 selected by the print command signal
When a current is applied to the coil core 3a, the magnetic flux flowing in the bottomed cylindrical yoke 5 and the side yoke 6 from the coil core 3a through the core block 3 faces the coil core 3a, and the drive lever 7
The drive lever 7 is attracted to the coil core 3a by flowing into the armatures 8 having ferromagnetism provided on both sides of, and is rotated clockwise in the figure, and the print wire 10 held at the tip is passed through the ink ribbon 18. Printing is performed by hitting on the recording paper 19.

2 and 3 show the details of the wire nose portion 1a and the wire guide 2 which are the features of the present invention. The minute protrusions 2 provided on the plate-shaped wire guide 2 having high wear resistance.
a, a concave portion 1c provided in the wire guide guide groove 1b of the wire nose portion 1a made of an elastic material such as resin and facing the minute protrusion 2a.

Therefore, the operation of the wire guide and the wire nose portion 1a thus configured will be described. The wire guide 2 is inserted into the guide guide groove 1b of the nose portion 1a and is provided in the minute protrusion 2a and the guide guide groove 1b. By fitting the concave portion 1c, the wire guide 2 can be fixed to the wire nose portion 1a to prevent the wire guide 2 from falling off when the wire is assembled, and to accurately and easily bring a large number of print wires to the tip of the nose with a required positional relationship. It is possible to derive it, that is, it is possible to significantly improve the assemblability. Further, it is possible to prevent the guide 2 from moving due to the wire side pressure during the wire printing, and to prevent the wire from bending and resulting in the loss of the printing force, thereby achieving high printing quality. In this way, the plate-shaped wire guide is provided with minute protrusions and is configured to be fitted into the concave portion provided in the nose portion guide groove when the guide is inserted. By fixing the wire guide and the wire nose portion, the wire is incorporated. It is possible to prevent falling off at a time and to accurately and easily lead a large number of print wires to the tip of the nose with a required positional relationship, that is, to significantly improve the assembling property. Further, during wire printing, the wire is prevented from bending due to the wire side pressure, and high printing quality is always ensured.

[Advantage of the Invention] The print head of the wire type dot printer according to the present invention is
When inserting the wire guide into the guide groove provided on the inner wall of the wire nose part made of an elastic member, after the minute projections provided on the wire guide spread out the guide groove, the minute projections become the locking parts after restoration. Since the wire nose of the elastic body is deformed when it is fitted, and the wire guide itself that directly guides the print wire and greatly affects the positioning and sliding resistance of the print wire does not need to be deformed, the position accuracy of the print wire is improved. In addition, since the constraint conditions on the material and shape of the wire guide are greatly relaxed, it is possible to select a material having excellent wear resistance, improve durability, and provide an inexpensive product.

[Brief description of drawings]

FIG. 1 is a sectional view of a print head showing an embodiment of the present invention,
2 is an exploded perspective view of an essential part of the present invention, and FIG. 3 is a sectional view taken along the line AA 'in FIG. 1 ... Guide holder 1a ... Nose part 1b ... Guide groove 1c ... Recess 2 ... Wire guide 2a ... Micro projection 4 ... Excitation coil 7 ... Drive lever 10 ... Wire 11 ... Tip guide 16 ... … Nose cover 20… Platen

Claims (1)

[Scope of utility model registration request] 1. A plate-shaped wire guide having a plurality of holes for slidably guiding a print wire, fine protrusions on the side surface, and guide grooves into which the wire guide is inserted are provided on both inner walls. And a wire nose portion made of an elastic member provided with a locking portion for engaging the minute protrusions of the inserted wire guide, and the minute protrusions guide the minute protrusions when the wire guide is inserted. A print head for a wire-type dot printer, wherein after the groove is widened, the minute protrusions are fitted to the restored locking portion.