JPH0245160A - Assembling method of dot printed head - Google Patents

Abstract

PURPOSE:To scale up the shape of the mounting section of a nose sufficiently without being limited by the form of the nose by superposing and fixing both a front yoke and a leaf spring and both the leaf spring and an armature. CONSTITUTION:An armature 30 is inserted into the slit 25 of a front yoke 24 while a leaf spring 26 and a spacer 28 are stacked to the front yoke 24. The front yoke 24, the leaf spring 26 and the spacer 26 and both the armature 30 and the leaf spring 26 are superposed and fastened through welding. A printing wire 32 is inserted into the guide holes 36 of a guide member 37, and the front yoke 24, the leaf spring 26, the spacer 28 and a nose member 33 are assembled while a rear yoke 13 is assembled so as to be oppositely faced to the armature 30. Consequently, a through-hole for electron beam welding need not be formed to the nose member 33. Accordingly, the degree of freedom of the shape of the nose member 33 is improved, thus preventing limitation on the shape of a mounting section 38.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for assembling a dot printer head in which a printing wire is moved to a printing position by swinging an armature based on energization of a coil.

[Prior Art] Conventionally, there has been a dot printer head in which a plurality of armatures are swingably supported on a head body via leaf springs, and a printing wire is moved to a printing position based on the swinging of each armature. Are known. In such a dot printer head, a spacer, a leaf spring, and a front yoke are temporarily assembled to the nose member by positioning and overlapping them in a predetermined order. In this state, a plurality of armatures to which printing and wires have been fixed in advance are positioned and arranged on the support plate while inserting each printing wire into the guide portion of the nose member. Then, an electron beam was irradiated to a predetermined position through a through hole formed in the nose member to weld the front yoke, the leaf spring, the spacer, and each armature to the leaf spring, respectively. After that, the rear yoke was assembled so that the armature and core faced each other.

[Problems to be Solved by the Invention] However, in this conventional assembly method,
As shown in FIG. 9, a number of through holes 1 through which the electron beam passes must be provided in the nose member 2, depending on the welding points between the front yoke, leaf spring, and spacer, and the welding points between each armature and leaf spring. However, the shape of the nose member 2 is limited.

For this reason, it is not possible to make the shape of the attachment part 3 for attaching the dot printer head to the carriage sufficiently large, and the contact area between the carriage and the attachment part 3, which is indicated by diagonal lines in FIG. There was a problem in that it was difficult for the heat generated to escape to the carriage through the mounting portion 3. In addition, when inserting the printing wire into the guide section, the operator must repeatedly grasp one armature and insert it into the guide section, then grasp one armature and insert it into the guide section, and then remove all the printing wires. was inserted into the guide section. For this reason, there is a problem in that the work of inserting the printing wire into the guide portion is cumbersome and takes time.

Therefore, the present invention aims to solve the above problems,
To provide a method for assembling a dot printer head that is easy to assemble without being restricted in shape.

[Means for Solving the Problems] In order to achieve the above object, the present invention takes the following method to solve the problems. That is, a rear yoke having a large number of cores around which coils are wound, an armature supported by a flexible portion of a leaf spring so as to approach and separate from the core, and a front yoke having a large number of radial slits for accommodating the armature. and a printing wire fixed to the armature and slidably supported by a number of guide holes of the guide member, and forming a magnetic path through the core, armature, front yoke, and rear yoke. First, an armature is inserted into the slit of the front yoke, and a leaf spring is stacked on the front yoke.Next, the front yoke and the leaf spring and the leaf spring and the armature are stacked and fixed, respectively. This is a method for assembling a dot printer head, which is characterized in that a printing wire is inserted into a guide hole of a guide member, and the front yoke, leaf spring, and nose are assembled, and a rear yoke is assembled so that the armature and core face each other. .

[Function] The method for assembling the dot printer head according to the above method first includes:
Since the front yoke and the leaf spring and the leaf spring and the armature are stacked and fixed to each other, there is no need to provide a through hole or the like in the nose, and therefore there is no restriction on the shape of the nose. Further, at this time, the printing wire is in a state of convergence at one location, which facilitates subsequent insertion of the printing wire into the guide hole.

[Example] Embodiments of the present invention will be described in detail below based on the drawings.

First, the structure of the dot printer head will be explained based on FIGS. 1 to 3. To this dot printer
The head includes a head body 11 made of a magnetic material, and a cylindrical recess 12 is formed in the head body 11. The rear yoke 13 is formed by the bottom wall of the recess 12 and the cylindrical outer peripheral wall.
It consists of

A quadrangular flange portion 14 extends in the radial direction on the opening side of the recess 12. In addition, a plurality of cores 15 are provided in the recess 12 and integrally protrude from the head main body 11 at equal intervals. It's being passed around.

A plate-shaped permanent magnet 1B having approximately the same external shape as the flange FJJ14 is superimposed on the flange FJJ14. This permanent magnet 18 consists of a pair of left-right symmetrical separating pieces 1.9.2.
Consists of 0. This separation piece i9.20 1 is stacked on the flange 14 in abutted state, and in this state an opening 21 having the same shape as the inner diameter of the recess 12 is formed.

Further, a front yoke 24 is laminated on top of the permanent magnet 1 through a smoother 23 made of a magnetic material, and this front yoke 24 has the same number of slits 25 at positions facing the core 15. is formed. The outer shapes of the spacer 23 and the front yoke 24 are quadrangular, which is the same as that of the permanent magnet. , also, front yoke 2
Between 4 and space tf 2 ;3, each core 15
A wear-preventing film 22 is disposed across the end face of the holder.

This film 22 is made of polyamide having heat resistance and abrasion resistance.

As shown in FIG. 2, a plate spring 26 made of elastic paulownia material, for example maraging steel, is laminated on the front yoke 24 together with a spacer. A plurality of armatures 30 made of a magnetic material, for example, a silicon steel plate, are fixed to the leaf spring 26ζ. Each armature 30 is disposed within the slit 25, and a printing wire 32 that extends toward the platen 31 is attached to the tip of the armature 30, converging at the center of the head body 11 at its base. Fixed at the end.

A nose member 33 is provided to overlap the spacer 2, and the nose member 33 includes a flat plate portion 34 that covers each armature 30, and a cylindrical guide portion 35 that projects forward.
is formed. The flat plate portion 34 contacts the spacer 28, and the guide portion 35 has a plurality of guide members 37 fixed therein, each having a plurality of guide holes 36 formed therein. The printing wires 32 are movably inserted into the guide holes 36 of the guide member 37, respectively. Furthermore, a mounting portion is formed at the base of the guide portion 35 for tightly fixing the guide portion 35 to a carrying case (not shown).

Next, the structure of the plate spring 26 will be explained in detail.

The plate spring 26 has a peripheral edge 40 on its outer periphery, and a plurality of bases 41 are formed radially extending from the inner edge of the peripheral edge 40 toward the center. From each base 41, a torsion bar 42, which is the center of swing of each armature 30, extends in a direction perpendicular to the longitudinal direction of the armature 30, and the tip of the torsion bar 42 extends radially into a connecting portion 4.
Connected to both sides of 3. A pair of bending plate spring parts 44 further extend from both sides of the connecting part 43 near where the torsion bar 42 is connected, and the tips of the bending plate spring parts 44 form a concentric circle with the arrangement circle of the cores 15. It is connected to a connecting ring 45 that forms a. This connecting portion 43 is
Corresponding to the positions of the cores 15, the number of the cores 15 is equal to the number of the cores 15, and each connecting portion 43 has the armature 30.
is welded and fixed at two welding points 46 and 47.

Further, the spacer 28 is provided with a communication hole 49 larger than the plurality of connection parts 43 at a position ζ corresponding to the connection part 43, and a connection arm 50 connects the peripheral part 51 and the leaf spring 26. A connecting ring 5 concentric with the ring 45
2 are connected.

And, by the connecting arm 50 and the front yoke 24,
The base 41 of the leaf spring 26 is held between the connecting ring 52 and the front yoke 24, and the connecting ring 45 of the leaf spring 26 is held between the connecting ring 52 and the front yoke 24.

Furthermore, the flat plate portion 34 of the nose member 33 and the front yoke 2
Both connecting rings 45 and 52 are held between them.

On the other hand, the two positioning holes 60 of the front yoke 24, the leaf spring 26, the armature 30, and the spacer 28, which are integrally stacked and fixed in an assembly procedure described later, and the permanent magnet 1
8. Two positioning holes 61, 62, 63, and 64 formed in each of the film 22 and the nose member 33,
Two positioning pins 65 implanted in the rear yoke 13 are fitted to position each member, and the members are stacked on top of each other in the predetermined order described above.

Furthermore, a connecting member 71 made of a spring member is attached to the front surface of the nose member 33 at its central ring-shaped portion 72, and four protrusions 73 bent approximately at right angles are arranged on the outer periphery of the connecting member 71. They are formed to protrude radially at intervals.

The flat plate portion 3 of the nose member 33 is provided on both sides of the proximal end of each projecting piece 73.
A pair of elastic pieces 74 that abut on the front surface of the rear yoke 13 are integrally bent and formed, and a pair of locking pieces that can be engaged with a locking recess 75 formed on the rear surface of the rear yoke 13 is provided at the tip of each protruding piece 73. 76 are integrally bent and formed.

Next, the operation of the above-mentioned do-sit printer head will be explained. First, when each coil 17 is not energized, the front yoke 24, armature 30, core 1
5 and the rear yoke 13, each armature 30 swings around the torsion bar 42 and is attracted to the core 15, and each printing wire 32
is placed in the rear rest position. Along with this, strain energy due to torsion is accumulated in each torsion bar 42, and strain energy due to bending is accumulated in each bending plate spring portion 44.

In this state, when one of the coils 17 is selectively energized and the core 15 is temporarily excited so as to cancel the magnetic force of the magnetic path, the torsion bar 42 as a flexible part and the bent plate spring part Due to the strain energy of 44, the torsion bar 4
The armature 30 is swung around 2 to the printing position, and then swung back to the printing position based on the magnetic force of the permanent magnet 1 and held at the rest position.

Next, the order in which the dot printer head starts up in the morning in this embodiment will be explained.

First, the armature 3 has printing wires 32 attached to each slot 25 of the front yoke 24 in advance.
0's are inserted at predetermined intervals.

At the same time, the leaf spring 26 is stacked on the front yoke 24, and the spacer 26 is further stacked on top of the leaf spring 26, and temporarily fixed with a jig or the like.

Next, as shown in FIG. 5, the front yoke 24, leaf spring 26, and spacer 2
and the connecting ring 52 are irradiated with an electron beam to perform welding at welding points 77 and 78 at a predetermined interval. Further, the plate spring 26 and each armature 30 are irradiated with an electron beam at the connecting portion 43 of the plate spring 26, and welding is performed at each of two welding points 46° and 47. When welding with this electron beam, each welding location 46. 47. 7
In steps 7 and 78, welding can be performed using a cylindrical chiller 80, suppressing the thermal influence of the electron beam on the torsion bar 42 and the bent plate spring portion 44, and welding at each welding location 4.
B, the bead diameter of 47.77.78 is the minimum required diameter.

As a result, the front yoke 24, the leaf spring 26, the spacer 28, and the leaf spring 26 and the armature 30 are stacked and fixed, respectively. Note that this overlapping fixing is not limited to welding using an electron beam, but may also be welding using a laser beam, resistance spot welding, or the like.

In this way, the front yoke 24, leaf spring 26, spacer 28, and armature 30 are temporarily assembled and removed from the jig, as shown in FIG.

At this time, each printing wire 32 is in a state where it is converged in the center. After that, the guide member 37 of the nose member 33
Each printing wire 32 is inserted into the guide hole 36 of the front yoke 24, the leaf spring 26, the spacer 2, the armature 30, and the nose member 33 which are assembled into the plates.

At the same time, the rear yoke 13, to which the permanent magnet, spacer 23, and film 22 are bonded in advance, is assembled to the front yoke 24 so that the armature 30 and the core 15 face each other. During these assemblies, positioning pins 65 are sometimes inserted into the positioning holes 60 to 64 of each member to position each member.

In this way, rear yoke 13, permanent magnet 1, spacer 2
3, film 22, front yoke 24, leaf spring 26,
In a state where the spacer 28 and the nose member 33 are stacked, the locking pieces 76 of each protruding piece 73 of the connecting member 71 are engaged with the locking recess 75, and each elastic piece 74 comes into elastic contact with the flat plate part 34. The parts from the head body 11 to the nose member 33 are laminated, and each member is clamped and fixed.

In this embodiment, the spacer 28 is also attached to the front yoke 24.
, is fixed to leaf spring 2G by welding, but spacer 2
Even if it is not fixed by welding, it is possible to implement it as a dot printer head by just placing a negative layer on the 4 pieces (reverse spring 26), or it may not require a spacer due to its configuration. The yoke 24 and the plate spring 26 and the plate spring 26 and the armature 30 may be stacked and fixed to each other.

As mentioned above (7), the method for preparing the dot printer head of this embodiment is to first open the slit 25 of the front yoke 24.
While inserting the inner armature 30, stack the front yoke 26, spacer 2B, and 2B on the front and knit yoke 24, then place the front yoke 24, plate 24, spacer 28, and plate The screw 26 and the armature 30 are overlapped and fixed together by welding, and then the printing wire 32 is inserted into the guide hole 36 of the guide member 37 to attach the front yoke 2.
4. Assemble the leaf spring 26, spacer 28, and nose member 33, and assemble the rear yoke 13 so as to face the armature 30.

Therefore, the nose member 33 is assembled after the front yoke 24, plate spring 26, spacer 26, and armature 30 have been temporarily assembled, so that the nose member 33 has a transparent material for electron beam welding, as shown in FIG. There is no need to provide holes. Therefore, the degree of freedom in the shape of the nose member 33 is increased, and there is no restriction on the shape of the attachment part 3. Therefore, the shape of the attachment part 3 is made sufficiently large, as shown by diagonal lines in FIG. The area of contact with the carriage can be made sufficiently large, and can be made large enough to dissipate heat generated in the dot printer head from the mounting portion 38 to the carriage. Furthermore, when inserting the printing wires 32 into the guide holes 36, since the printing wires 32 are converged at the center of the sleeve, it is easy to insert each printing wire 32 into the guide holes 32. This reduces work time.

It should be noted that the present invention is not limited to these embodiments, but can be implemented in various ways.

[Effects of the Invention] As detailed above, the method for manufacturing the dot printer head of the present invention involves first stacking and fixing the front yoke and the leaf spring, and the leaf spring and the armature, respectively, so that a through hole for welding is provided in the nose. This eliminates the need for this, and the shape of the nose attachment portion can be made sufficiently large without being constrained by the shape of the nose. Further, since the printing wires are converged, the work of inserting the printing wires into the guide holes becomes easier, and the working time is reduced.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a dot printer head using the dot printer head assembly method of the present invention, and FIG. 2 is an exploded perspective view showing the main parts of the dot printer head of this embodiment.
Fig. 3 is a partially cutaway side view of the dot printer head of this embodiment, Fig. 4 is a cross-sectional view of the main parts of the dot printer head of this embodiment, and Fig. 5 is the overlapped and fixed by welding of this embodiment. FIG. 6 is a front view of the nose member of this embodiment, FIG. 7 is a bottom view of the nose member of this embodiment, FIG. 8 is a front view of a conventional nose member, and FIG. 9 is a front view of a conventional nose member. It is a bottom view of a nose member. 2.33...Nose member 13...Rear yoke 26...Plate spring 30...Armature 36...Guide hole

Claims (1)

[Scope of Claims] A rear yoke having a large number of cores around which coils are wound, an armature supported by a flexible portion of a leaf spring so as to approach and separate from the core, and slits for accommodating the armature arranged radially. a plurality of front yokes; and a printing wire fixed to the armature and slidably supported by the plurality of guide holes of the guide member, dots forming a magnetic path through the core, armature, front yoke, and rear yoke. In the printer assembly method, first, an armature is inserted into the slit of the front yoke, and a leaf spring is stacked on the front yoke, and then the front yoke and the leaf spring, and the leaf spring and the armature are stacked and fixed. Thereafter, the front yoke, leaf spring, and nose are assembled by fitting a printing wire into the guide hole of the guide member, and the rear yoke is assembled so that the armature and core face each other. How to assemble.