JPS59148670A - Wire dot printer - Google Patents

Abstract

PURPOSE:To improve the assembling property printing wire by a method in which wire guides set at intervals are relatively positioned, and a plate-shaped projection with an U-shaped groove is provided in the wire guide on the drive end side of the wire. CONSTITUTION:In a wire dot head of a two-stage structure having drive units on the front and rear stages, the drive unit is made up of a permanent magnet 1, an upper yoke 4, a lower yoke 3, and a stopper plate 10, each of which is fixed integrally by a fixing shaft 12. Printing wires 9f and 9r are fixed to the tip of a lever 8 by resistance welding, the lever 8 and a plate spring 7 are attached by calking, and a coil 5 is wound around the core 2. A plate-shaped projection 23a to divide the guide hole into right hole and a left hole is provided to the guide plate 23, and U-shaped grooves 23b are provided along the guide hole on both sides of the projection 23a. The grooves 23b are led to guide holes 23-13-23-24 for the printing wire at the rear stage, and guide holes 23-1-23-12 for the printing wire at the front stage are provided around the guide holes for the rear stage.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire dot head, and more particularly to a wire guide for guiding a printing wire.

Conventional equipment of this type has 7 bins. There are wire dot heads such as pin, 16-pin, and 24-pin wire dot heads, and when assembling these hems, it is difficult to insert the Inpo wire into the correct guide hole, making it difficult to assemble the dot. Ta. During this time, when the head has a large number of bins such as a 16-pin, 24-bin, etc., the guide holes of the wire guide are close to each other due to the large number of wires, and it is necessary to insert the wire into the correct guide hole. The present invention eliminates the above-mentioned drawbacks, and its purpose is to improve the wire dot head, which makes it difficult to assemble the printing wire. Our goal is to provide the following.

Embodiments of the present invention will be explained below based on the drawings.

Figure 1 is a sectional view of a 24-pin wire dot head with 12 pins arranged in the front and rear stages, showing an embodiment of the present invention, and Figure 2 is an exploded view of the drive unit that constitutes the printing node. . As shown in Figure 1, the wire dot head has a two-stage structure with drive units arranged in the front and rear stages.
The structure of the drive unit is such that a permanent magnet 1, an upper yoke 4, a lower yoke, and a stopper plate 10 are integrally fixed by a fixed shaft 12. Also, the printing wire 9. The tip of the lever 8 is fixed by resistance welding or brazing, and the lever 8 and the leaf spring 7 are connected by caulking with the plunger 6.
Core 2 is attached by caulking the lower yoke 3Vc, and core 2
A coil 5 is wound around it.

FIG. 6 is a perspective view of the wire guide plate 23, in which a plate-shaped protrusion 26α that divides the wire guide plate 23Vc1-t guide hole into left and right parts is provided. An fcU-shaped groove 23b is provided along the hole, and this U-shaped groove 23b has guide holes 23-43 to 23-24 for the latter printing wire (the guide holes 23-19 to 23-24 are formed on the plate shown in FIG. 3). Since it is located on the right side of the shaped projection 23a, it leads to L/1), which is not visible when viewed from above, and the guide holes 26-1 to 2 for the KM front stage printing wire are located around the guide hole for the rear stage.
3-12 is provided. 23d is a hole into which the wire guide fixing shaft 30 is inserted.

At the end of the plate-like projection 23a, there is a projection 23c for engaging with the wire guide 29 at the subsequent stage. The wire guide 19.2'0°21.22 in the front part of the wire guide plate 23 is fixedly positioned as a wire guide fixed @ 30171: and the wire guide 29 in the rear part is fixed by the protrusion of the wire guide plate 26. 23c are engaged, the front wire guide and the rear wire guide are positioned relative to each other.

Next, when assembling this head, first attach the front head frame 31Vcffi guide unit to the wire kite board 26's front guide hole 2.
3-1 to 23-12 Insert each VC, then wire guides 22, 21, 20, 19.18 K open wire 9
After being guided by flrr, the installation of the front drive unit is completed. Next, the rear head frame 32 is attached to the front seat frame 31. When inserting the drive unit into the rear head frame 32, first connect the printing wire 9 r td.
It is inserted into the guide hole of the rear wire guide 24, and then
25, 26, 28.29 are inserted into the wire guide f. Then, the printing wire 9r is 1 wire guide plate 2
3, the wire is guided to the guide holes 23-13 to 23-24 of the wire guide plate 23 while being guided by the U-shaped groove 23/J provided in the plate-like protrusion 23 (Z), The rest is wire guide 25.22.21
．． The installation of the drive unit is completed by being guided through the 20.19°18 guide hole. In this way, to the next stage.
After one oscillating unit is attached to the head frame 32 with 12 fastening threads and the back ivy 66 is attached, the head frame is fixed with the fixing plate plate 34 to complete the assembly of the head.

Next, K to operate the print head described above is made possible by passing a current through the coil 5 to cancel the magnetic attraction force of the permanent magnet 1. That is, at all times, due to the magnetic attraction force of the permanent magnet 1, the plate bath 7 looks upward and the planter 6 attracts the core 2VC.

When a current is passed through the coil 5 in a direction that cancels out the magnetic field of the permanent magnet 1, the elastic force of the leaf spring 7 causes the plunger 6 to
1-t is released from the core 2, its motion is transmitted to the printing wire 9 via the lever 8, and the wire collides with the recording paper via an ink ribbon (not shown), printing a dot on the recording paper. , the plunger 6 is again attracted to the core 2Vc, and the printing wire also returns to the waiting position.

Note that on the wood flow side, a protrusion 23c is provided at the rear end of the plate-shaped protrusion to engage with the wire guide at the later stage, but a hole is provided in place of the protrusion 23c, and the wire guide at the rear stage engages with this hole. A protrusion may also be provided.

FIG. 4(d) is an Ilfrm diagram of a single-stage clapper-type wire dot head showing another embodiment of the present invention, in which wire guide plates 42, 43, and 44 are arranged at intervals; 43.44VC is provided with plate-like protrusions 42a, 43a, 44a having a structure similar to the plate-like protrusion 23a having a guide groove of the present invention shown in FIG. each end of the projections 42c, 43+c for engaging the wire guide 41 and the wire guide plate 42.43;
44c, the wire guide plate 42,
43, 44 and the wire kite 411- are relatively positioned.

Next, assembling this head, particularly regarding insertion of the printing wire, first inserts the printing wire 49 into the guide hole of the wire guide 40 and then into the guide hole of the wire guide 41. When the plain wood wire 49 is applied to the plate-shaped protrusion 4''2a of the wire guide plate 42, the U-shaped groove (not shown in FIG. 4) provided in the plate-shaped protrusion 42a causes the guided force 5 Then, the printing wire 49 (d) is guided and inserted into the guide hole of the wire guide plate 43 one after another in the same manner, and the insertion of the printing wire is completed. Next (te drive±J lever 46,
The head assembly is completed by incorporating the fulcrum presser spring 47.

In this embodiment, the wire guide plates 42°, 43.
44 respectively, protrusions 42c for mutually engaging positioning;
43C, 44c and an example in which engagement holes were provided were explained,
The outer periphery of the wire guide plate is positioned at the nose 5o of the head, and the protrusions 42c, 43c, 4
It is also possible to soften 4c.

As explained above, the present invention is applicable to a wire dot head having a two-stage structure of a front stage and a rear stage, and a wire dot head having a single stage structure in which a plurality of VC wire guides are installed at intervals, when inserting a printing wire. By positioning the wire guides arranged at intervals relative to each other, and further providing a plate-shaped protrusion having a 0-shaped groove for guiding the wire on the wire guide on the moving end side of the wire, The inserted printing wire is guided by this U2-shaped groove and inserted into the correct wire guide hole, so the printing wire is printed! The wire insertion work is easy ((can be done in a short time). This significantly improves the ease of assembling the head, and this effect is great. Although mutual positioning is performed by engaging with each other, the plate-like protrusion having the U-shaped groove alone has a great effect in terms of ease of inserting the wire.

[Brief explanation of drawings]

FIG. 1 d is a sectional view of a print head showing an embodiment of the present invention;
Fig. 2 is an exploded view of the same drive unit, Fig. 6 is a diagonal view of the wire guide plate according to the present invention, and Fig. 4 is an exploded view of the same drive unit.
FIG. 3 is a cross-sectional view of a print bed showing a different embodiment. 19.20, 21.22... Front wire guide 23.42, 43.44... Wire guide plate 24.25, 26, 28.29... Back wire guide 9f...Previous printing wire? r...Late stage printing wire 49...Printing wire and above Applicant Nibunon Co., Ltd.

Claims (1)

[Claims] In a wire dot head having a plurality of printing wires, a wire guide member having a guide hole for guiding the printing wire has a plate-like projection at one end, and a surface of the plate-like projection has a substantially cylindrical shape for guiding the printing wire. A wire dot head characterized in that a U-shaped groove is provided, and the groove is connected to a wire guide hole of the wire guide member.