JPH0453949Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a guide device for a printing wire in a wire printer.

[Prior Art] A printing wire in a wire printer is generally slidably guided through a plurality of guide members such as a leading edge guide, an intermediate guide, and a trailing edge guide. Each of these leading edge guides, middle guides, and trailing edge guides are inserted into grooves formed at regular intervals on the inner surface of the hollow head frame, and then fixed using appropriate fixing means such as adhesive. (e.g., U.S. Patent No.
3802543 specification).

[Problems to be Solved by the Invention] The slidability of the printing wire depends on the positional accuracy between the leading edge guide, the intermediate guide and the trailing edge guide, particularly the leading edge guide and the intermediate guide.

However, according to the above-mentioned known guide structure, when inserting and fixing the front end guide, intermediate guide, and rear end guide into the groove of the head frame, it takes a lot of effort to adjust their relative positions with high precision. It is necessary to perform relative positioning using a jig or the like, which poses a problem in that the workability of assembly is significantly reduced.

Therefore, the present invention aims to improve the workability of assembling a wire guide device and to easily and reliably guarantee sufficient slidability of the printing wire.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a printing wire that is located behind the tip guide that slidably guides the tip of the printing wire. A guide assembly is provided in which an intermediate guide that slidably guides the intermediate portion of the guide assembly is integrally connected. The head frame is formed with a holding groove that allows the guide assembly to be inserted from a direction perpendicular to the direction in which the printing wire extends, and the guide assembly has an inner wall of the holding groove facing the direction in which the printing wire extends. A positioning piece that extends in a direction perpendicular to the extending direction of the printing wire and has a distal end that engages with the inner wall of the holding groove facing in the extending direction of the printing wire is formed. The positioning piece is inserted into and engaged with the holding groove in a manner that it cannot move in the extending direction of the printing wire.

[Embodiment] Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, a front end guide 3 and an intermediate guide 4 of a printing wire 2 are arranged at the front of a head frame 1. As shown in FIG. The leading end guide 3 and the intermediate guide 4 are previously integrated in a pre-process before being assembled into the head frame 1, as will be explained in detail later. A rear end guide 5 for slidably supporting the rear portion of the printing wire 2 is attached to a holder portion 1a formed at the rear portion of the head frame 1. A printing pin 6 is fixed to the rear end of the printing wire 2, and is biased rearward via a return spring 7 to push the printing lever 8.
It is in contact with the tip of the The printing lever 8 is rotatably supported at its rear end,
This rear end portion is pressed against the rear end surface of the U-shaped core 10 via a pressure spring 9. A driving coil 11 is wound around the core 10, and by energizing the driving coil 11, the core 10 is excited, the printing lever 8 is magnetically attracted to the core 10, and the printing wire 2 is moved by the return spring. It is forced to move forward against the spring force of 7. A head cover 12 is arranged behind the pressing spring 9, and this head cover 12 is fixed to the head frame 1 via screws (not shown) or the like.
A pillar 1b formed integrally with the head frame 1 passes through it. Further, a damper 13 is provided on the front surface of the pressing spring 9 to absorb the impact when the printing lever 8 returns.

In FIG. 1, only one set of the printing wire 2 and its electromagnetic drive device is depicted, but it goes without saying that in reality, a plurality of sets are provided.

Next, the guide assembly consisting of the tip guide 3 and the intermediate guide 4 will be explained in detail with reference to FIGS. 2 to 4.

The tip guide 3 has a rectangular cylindrical side wall 3 on the back surface of a flat plate portion 3b in which a plurality of guide holes 3a are bored.
c is formed, and a plurality of protrusions 3d and 3e for positioning the intermediate guide 4 are provided protruding from the rear end surface of this side wall 3c. A portion of the flat plate portion 3b protrudes outside the cylindrical side wall 3c to serve as a positioning piece. On the other hand, the intermediate guide 4 having a plurality of guide holes 4a is shaped like a flat plate, and has positioning holes 4b and 4c that fit into the protrusions 3d of the tip guide 3. The intermediate guide 4 is integrally connected to the tip guide 3 by fixing the protrusions 3d, 3d fitted in the positioning holes 4b, 4c with adhesive, heat welding, or press fitting. In addition, the protrusions 3d fitted into the positioning holes 4b and 4c are
Even if the fitting is loose, the distal guide 3 and intermediate guide 4 are fixed by incorporating the guide assembly into the head frame 1. In this connected state, the protrusion 3e comes into contact with the front surface of the intermediate guide 4 and acts as a spacer. Moreover, a hemispherical protrusion 4d is protrudingly provided on the front surface of the distal end of the flat plate portion 3b of the distal guide 3 and on the back surface of the intermediate guide 4 as an engaging portion with the semicylindrical protrusion 3f.

The guide assembly consisting of the distal guide 3 and the intermediate guide 4, which are integrated in this way in the pre-head assembly process, is such that the protrusions 3d, 3d of the distal guide 3 fit into the holes 4b, 4c of the intermediate guide 4. As a result, the positional relationship between the two can be maintained with high precision without using any jigs or the like.

This guide assembly is held on the head frame 1 with the following structure.

That is, as shown in the first figure, the side edge of the flat plate part 3b of the tip guide 3 is inserted from below into the holding groove 1c formed in the inner wall of the head frame 1.
At this time, the protrusion 4d on the back surface of the intermediate guide 4 engages with the wall 1d of the head frame 1, so that the entire guide assembly is pressed against the front wall f of the head frame 1 so as to be immovable in the front-back direction. It's getting old. In the assembled state shown in the first figure, the projection 3f on the front surface of the tip guide 3 engages with the positioning hole 1g in the front wall 1f, so that the entire guide assembly is stably held within the head frame 1. It's summery. Note that 1e is a window hole opened in the front wall 1f, through which the printing wire 2 can pass.

[Effects of the invention] As described above, according to the invention, since a guide assembly consisting of a tip guide and an intermediate guide that are integrated in advance in the pre-process of head assembly is used, the work efficiency of head assembly is greatly improved. Improved. In particular, since the tip guide and intermediate guide, which most affect the sliding properties of the printing wire, are integrated, the positional relationship between the two can be maintained with high precision, and therefore the necessary and sufficient sliding required for supporting the printing wire can be achieved. Mobility can be easily and reliably guaranteed without using jigs or the like.

In addition, since the guide assembly is inserted into and engaged with the holding groove formed in the head frame so that it cannot move in the direction in which the printing wire extends, the guide assembly can be attached by sliding the printing wire without using adhesive or the like. This also improves the workability of head assembly and guarantees the slidability of the printing wire.

[Brief explanation of the drawing]

The drawings show a preferred embodiment of the present invention, in which FIG. 1 is a cross-sectional view of a main part thereof, FIG. 2 is a side view of a guide assembly consisting of a tip guide and an intermediate guide, and FIG. Rear view of the above assembly, Figure 4 is the second
It is a sectional view taken along the - line in the figure. 2...Printing wire, 3...Tip guide, 4...
Intermediate guide.

Claims (1)

[Claims for Utility Model Registration] A printing wire guide device that is held in a head frame and slidably guides a printing wire, the device being attached to the rear of the tip guide that slidably guides the tip of the printing wire. The head frame has a guide assembly which is integrally connected with an intermediate guide that is located behind the tip guide and slidably guides the intermediate portion of the printing wire, and the head frame has the guide assembly. A holding groove is formed that allows the printing wire to be inserted from a direction perpendicular to the direction in which the printing wire extends, and the guide assembly includes a holding portion that engages with an inner wall of the holding groove facing the direction in which the printing wire extends. A positioning piece is formed and extends in a direction perpendicular to the extending direction of the printing wire, and a tip thereof engages with the inner wall, and the printing is applied to the holding groove via the holding part and the positioning piece. A guide device for a printing wire, characterized in that it is inserted into and engaged with the wire so that it cannot move in the direction in which the wire extends.