JPH0435347B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to the structure of a head for a wire-type dot printer, and particularly to a print wire guide member.

[Prior art]

The wire guide member attached to the tip of the wire nose guides a large number of print wires through guide holes provided on its surface and aligns them according to the size of the font to be printed. Since the print wire slides within the guide hole by an electromagnetic drive mechanism, it is subject to significant wear, and depending on how well the print wire and the guide hole fit together, there is a problem that printing quality may deteriorate. .

〔the purpose〕

The present invention has been made in view of these problems, and its object is to provide a highly durable wire-type dot printer that can smoothly guide a print wire.

[Means to solve the problem]

The head for a wire-type dot printer according to the present invention is a head for a wire-type dot printer that prints by hitting printing paper with the tip of a print wire via an ink ribbon, and has a guide groove provided in a direction perpendicular to the direction of movement of the print wire. A nose section at the tip, a highly wear-resistant plate-like member with multiple holes for guiding the printed wire, and a plurality of holes placed on both sides of this plate-like member for guiding the printed wire. one of the synthetic resin plate members has a columnar convex portion, and the other synthetic resin plate member has a wire guide member made of two synthetic resin plate members. Each of the plate-like members is provided with a positioning hole into which the above-mentioned convex portion is inserted, and the wire guide member is formed by inserting the above-mentioned plate-like member into the guide groove in a state where the above-described plate-like member is stacked between two synthetic resin plate-like members. It is characterized in that it can be inserted and fixed to.

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

FIG. 1 shows an example of the wire guide mechanism of a wire-type dot printer according to the present invention, and the reference numeral 1 in the figure is the nose of a wire-type dot printer such as that shown in Japanese Patent Publication No. 58-35475. Here, several stages of guide plates 2, 2 are provided to sequentially align a large number of printed wires driven by an electromagnetic drive mechanism, and a wire guide member 4, which will be described later, is installed on the inner surface of the tip from one side. Grooves 3, 3 for mounting are recessed.

4 is the above-mentioned wire guide member which is a characteristic part of the present invention, and this wire guide member 4 includes a sole plate 5 made of polyacetal resin or the like, and a sole plate 5 placed on the sole plate 5 which is poor in toughness but rich in wear resistance. A thin plate 6 made of ceramic, ruby, glass, etc.
This is laminated with a presser plate 7 made of polyacetal resin or the like that holds this on the sole plate 5, and the thin plate 6 and the presser plate are attached to dowels 5a, which are columnar convex portions protruding from the upper surface of the sole plate 5. The positioning holes 6a, 7a (positioned parts) of 7 are fitted, and then these are fitted into the recess 5b formed on the upper surface of the sole plate 5, and the whole is made so long that it can be installed in the groove 3 described above. It is assembled in one piece so that it has the same width and height.

In addition, the symbols 5c, 6c, and 7c in the figure represent the respective plates 5,
Wire guide holes are drilled on the 6th and 7th sides, and 5d indicates protrusions protruding from both sides of the sole plate 5 to prevent the wire guide 4 from falling off.

Therefore, when the sole plate 5, thin plate 6, and presser plate 7 configured in this way are stacked one after another to form a single wire guide member 4, the sole plates 5 provided above and below the thin plate 6 sandwich the thin plate 6.
The holding plate 7 uses the viscoelasticity of the resin material to absorb the chatter of the printed wire that occurs when polishing the tip of the wire to prevent the thin plate 6 from cracking, and also absorbs the vibration of the thin plate 6 that occurs during printing to smooth the printed wire. Enables smooth sliding contact.

〔Effect of the invention〕

The wire guide member of the present invention has a highly wear-resistant plate member sandwiched between synthetic resin plate members, so that the wire guide member is durable and has the viscoelastic properties of the synthetic resin plate. In addition to effectively absorbing chatter vibrations that occur in a plate-like member with poor toughness and effectively preventing damage to the plate-like member, one side of the synthetic resin plate member has a columnar convex portion, and the other side of the synthetic resin plate member has a columnar convex portion. The plate-shaped member and the plate-shaped member described above are each provided with a positioning hole into which the convex portion described above is inserted, and the wire guide member is formed by laminating the plate-shaped member described above between two synthetic resin plate-shaped members. It is inserted and fixed into the guide groove provided at the tip of the nose in this state, and the positional shift between these three members is prevented even before they are attached to the nose. It becomes possible to assemble with high positional accuracy, and positional deviation between the holes for guiding the printed wire provided in each member is prevented, and as a result, the above-mentioned effects of the laminated wire guide members can be further enhanced.

Furthermore, the assembly work can now be performed more reliably and easily.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a wire guide member constituting an embodiment of the present invention shown together with a wire nose;
FIG. 2 is a bottom view showing a state in which the wire guide member is attached. DESCRIPTION OF SYMBOLS 1... Wire nose, 2... Wire guide member, 3... Sole plate, 6... Thin plate, 7... Holding plate.

Claims (1)

[Scope of Claims] 1. In a head for a wire-type dot printer that prints by hitting printing paper with the tip of a print wire via an ink ribbon, a guide groove provided in a direction perpendicular to the operating direction of the print wire is provided at the tip. a highly wear-resistant plate-like member provided with a plurality of holes for guiding the printed wire; and a plurality of holes arranged on both sides of the plate-like member for guiding the printed wire. a wire guide member made of two synthetic resin plate-like members and a wire guide member, one of the synthetic resin plate-like members has a columnar convex portion, and the other synthetic resin plate-like member and the plate have a columnar convex portion. Each of the shaped members is provided with a positioning hole into which the convex portion is inserted, and the wire guide member is inserted into the guide groove with the plate member stacked between two synthetic resin plate members. A head for a wire-type dot printer, characterized in that the head is attached to the dot printer.