JPH02531A - Armature attaching structure for printing head - Google Patents

Abstract

PURPOSE:To easily attach an armature by providing an armature pilot guide protrusion for guiding the outer periphery of the armature to an armature base to be higher than a protrusion for positioning the armature. CONSTITUTION:An armature pilot guide protrusion 31c for guiding the outer periphery of an armature 32 is provided to be higher than an armature positioning protrusion 31b. In order to assemble an armature unit, an armature spring 33 is disposed on an armature base 31, the inner part of the armature 32 is inserted between the armature end guiding protrusions 31a of the base 31, and the outer part of the armature 32 is inserted between the protrusions 31c. Thus, the armature 32 is roughly positioned, and the armature positioning hole 32a of the armature 32 is disposed near the protrusions 31b. Then, the hole 32a is inserted to the protrusion 31b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to armature mounting structures in printheads.

[Prior Art] Conventionally, armatures are mounted by fitting armature positioning holes provided on the armature into respective armature positioning projections provided circumferentially on the armature base.

[Problems to be Solved by the Invention] When the armature positioning hole is inserted into a thin and short armature positioning projection, the armature covers the armature positioning projection and the projection is difficult to see. Put it in〈＜,
There was a problem in that it was difficult to attach the armature.

It is an object of the present invention to provide an armature mounting structure in a printhead that allows easy mounting of the armature.

[Means for Solving the Problems J] The above object is based on a structure in which the armature is mounted in a print head in which a plurality of armature positioning protrusions provided circumferentially on the armature base are fitted into armature positioning holes provided on the armature. This is achieved by providing an armature pilot guide protrusion higher than the armature positioning protrusion on the armature base for guiding the outer periphery of the armature.

[Function 1] The armature is roughly positioned by the armature pilot guide protrusion on the armature base, and the armature positioning hole is located near the armature positioning protrusion, so the armature positioning hole can be attached to the armature positioning protrusion very easily. I can do it.

[Example] Hereinafter, the invention will be described with reference to an illustrated example. FIG. 1 shows the overall appearance of a print head for a dot printer according to the present invention. In this embodiment, a wire unit 10, a solenoid unit 20, and an armature unit 30 are positioned by means to be described later, and the nose 11 of the wire unit 10, The solenoid base 21 of the solenoid unit 20 and the armature base 31 of the armature unit 30 are fixed together with a fastener 40.

Wire units) 10 (see Figures 2 and 5) Nose 11
A plurality of wires 12 are slidably guided in the wire 12, and have a tip end shaped like a tα line and a rear end shaped like a circumference. Moreover, the plurality of wires 12.

It is biased rearward by a wire return spring 14 disposed between the nose 11 and a wire bin 13 fixed to the rear end.

Further, the nose 11 is provided with a plurality of nose positioning protrusions 11a (three in the embodiment) protruding toward the solenoid base 20 near the outer periphery. Furthermore, a nose fitting cylindrical portion 11b and a protrusion 11c are provided at the center of the nose 11.

Tension/Ide Unit 20 (See FIGS. 2 and 6) A cylindrical core 22 is fixed to the bottom surface of a cup-shaped solenoid base 21 in a circumferential manner corresponding to the plurality of wires 12. Each core 22 has a cylindrical solenoid pobbin 2 with flanges at both ends, around which a solenoid 23 is wound.
4 is attached, and has a solenoid terminal 24a of a solenoid bobbin 24. The winding start portion and winding end portion of the thread/id 23 are respectively fixed to the solenoid terminal 24a.

A flexible printed board 2 is connected to the opposite side of the solenoid base 21 from the core 22 via an insulator 25.
6 is disposed in the solenoid base 21 and the insulator 25, and a coil bobbin positioning hole 21a into which the solenoid terminal 24a of the solenoid pobbin 24 is inserted.

25a is provided, and the flexible printed board 26 is provided with a hole into which the end of the solenoid 23 is inserted. Further, the solenoid base 21 has the nose 11
A seven-piece fitting hole 21b and a notch 21c are provided at locations corresponding to the nose fitting cylindrical portion 11b and the projection 11c, respectively. The solenoid terminal 24a of the solenoid pobbin 24 is inserted into the positioning hole 21a of the solenoid base 21, the coil bobbin position of the insulator 25 is inserted into the fixed hole 25a, and the hole of the flexible printed board 26, and the end of the solenoid 23 is inserted into the flexible printed board 26. 26 is fixed by soldering. As a result, the solenoid pobbin 24, the solenoid base 21. The insulator 25 and the flexible printed board 26 are positioned and stand together.

Further, the insulator 25 and the flexible printed board 26 are provided with a nose positioning protrusion 11 of the nose 11.
Nose positioning holes 25b, respectively, at locations corresponding to a.
26a, and a hole larger than the outer diameter of the nose fitting protrusion 11c of the nose 11 is provided in the center.

7-Machi Your Unit) 30 (see FIGS. 2 and 4) An armature tip guide protrusion 31a that guides the tip side of the armature 32 provided on the center side of the armature base 31 corresponding to each of the plurality of cores 22.
is provided. Armature positioning protrusions 31 are provided on the outer circumferential side of the armature base 31 in correspondence with the armatures 32, respectively. b, and the armature 32 is provided with an armature positioning hole 32a that is inserted into the armature positioning projection 31b. Furthermore, the armature 32 of the armature base 31
An armature pilot guide protrusion 31C for guiding the outer periphery of the armature 32 is provided between the armature 32 and the armature pilot guide protrusion 31c higher than the armature positioning protrusion 31b.
An armature pilot guide notch groove 32b is provided in a portion corresponding to the armature pilot guide notch groove 32b. Further, one of the armature pilot guide projections 31c is provided with an armature base positioning projection 31d so as to engage with the adjacent solenoid bobbin 24.

An armature spring 33 is disposed between the armature base 31 and the armature 32, and the armature spring 33 urges the inner end of the armature 32 to come into contact with the armature base 31. Further, on the armature 32, a resistor 34 is provided a21.

Therefore, the armature unit 30 is assembled as follows. An armature spring 33 is disposed on an armature base 31. Next, the inner part of the armature 32 is inserted between the armature tip guide protrusions 31a of the armature base 31, and the outer part of the armature 32 is inserted between the armature pilot guide protrusions 31c.

As a result, the armature 32 is easily positioned, and the armature positioning hole 32a of the armature 32 is
is located near the armature positioning protrusion 31b. Therefore, the armature position is determined by inserting the armature positioning hole 32a into the determining protrusion 31b.
positioning is performed with high precision. This completes the assembly of the armature unit 30.

iAssembling the whole Ikujigoku is done as follows. First, each unit 1
0, 20.30 are assembled separately in advance as described above, and the solenoid unit is mounted on the armature unit 30 so that the outer periphery of the solenoid bobbin 24 adjacent to the armature base positioning protrusion 31d of the armature base 31 is engaged. 20 aFa. Thereby, the relative positions of the core 22 and the armature 32 are determined with high precision.

Next, the nose fitting cylindrical portion ttb and the projection 11c of the 7-piece 11 of the wire unit 10 are inserted into the nose fitting hole 21b and the notch 21C of the solenoid base 21. Thereby, the solenoid base 21 and the nose 11 can be smoothly positioned. Subsequently, the nose positioning protrusion 11a of the nose 11 is inserted into the nose positioning hole 25b of the insulator 25 through the nose positioning hole 26a of the flexible printed board 26.

In this way, the nose 11 and the insulator 25 are positioned by the nose positioning protrusion tia formed on the outer circumferential side and the 71 position positioning hole 25b, so the nose 11 and the insulator 25 are positioned with high precision. In addition, the solenoid base 21, insulator 25, and solenoid bobbin 24 are precisely positioned by the positioning holes 21a, 25a of the solenoid base 21 and insulator 25, and the solenoid terminal 24a of the solenoid bobbin 24, so that the nose 11 is positioned at the solenoid base. 21
Positioned with high precision.

Finally, use the fastener 40 to sandwich the outer periphery of the nose 11 and the outer periphery of the armature base 31.
Each unit 1O120, 30 is fixed integrally.

■ Next, the operation will be explained. When the solenoid 23 is not energized, the armature 32 is
is in contact with the armature base 31. When the solenoid 23 is energized, the plunger 34 is activated by the core 22.
is drawn.

The armature 32 rotates around the armature positioning protrusion 31b of the armature base 31 and comes into contact with the core 22 via the leg 34. As a result, the rear end of the wire bin 13 is pushed and the wire 12 is moved to the nose 11.
When the solenoid 23 is deenergized, the armature 32 is moved in the opposite direction to the IDI direction by the biasing force of the armature spring 33. It returns to its original state and connects to the armature base 31. Further, the wire 12 returns to the armature 32 by the biasing force of the wire return spring 14 so as to flow into the armature 32.

[Effects of the Invention] As is clear from the above explanation, according to the present invention, the armature is roughly positioned by the armature base pilot guide protrusion, and the armature positioning hole is provided near the armature positioning protrusion. Therefore, the armature positioning hole can be attached to the armature positioning protrusion very easily, and the ease of assembly is improved.

[Brief explanation of the drawing]

FIG. 1 shows the appearance of an embodiment of a printing pad for a dot printer according to the present invention, and FIG. 1(a) is a front view. (B) is a side view, (C) is a rear view, Fig. 2 is an enlarged main sectional view, Fig. 3 is an enlarged sectional view of the solenoid terminal part in Fig. 2, and Fig. 4 is an enlarged explanatory view of the armature guide state. , FIG. 5 is a rear view of the wire unit, and FIG. 6 is a rear view of the solenoid unit. 31: 7-Mature base, 31b: Armature positioning protrusion. 31c: Armature pilot guide protrusion, 32: Armature. 32a: Armature positioning hole. Figure 1 Figure 2 Figure 3 Figure +1゜Figure

Claims (1)

[Claims] An armature mounting structure in a print head in which a plurality of armature positioning protrusions provided circumferentially on an armature base are fitted into armature positioning holes provided on the armature, in which the outer periphery of the armature is guided to the armature base. An armature mounting structure in a print head, characterized in that an armature pilot guide projection is provided higher than the armature positioning projection.