JPS609763A - Manufacture of integrated plate spring - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] In a so-called serial dot printer in which the print head moves relative to the platen in the space direction,
Printing is performed by impacting the ink ribbon on the printing paper with the tip of the printing wire. In such a wire-type print head, the plate spring for the armature is integrated to simplify assembly. The present invention relates to a method for manufacturing such an integrated plate spring.

[Technology background]

FIG. 1 is a plan view showing an outline of the serial printer, and FIG. 2 is a front perspective view of the print head. A continuous printing g2 is wound around the platen 1 as a printing medium, and a feed screw 3 and a guide shaft 4 are arranged parallel to the platen 1.
A carrier 6 on which a print head 5 is mounted is supported. By rotationally driving the feed screw 3 by the motor M via the belt 7, the print head 5 is transported at a constant speed in the space direction indicated by the arrow a1.

At the tip of the print head 5, there are a plurality of wires W+, Wz,
...W9 are arranged at equal intervals in the direction perpendicular to the space direction, and at each time t1, t2..., the wires W1, Wz... are selectively connected with a potential stone built into the head at a constant cycle. By driving and protruding the paper 2
A combination of dots D, etc. on top forms a character such as "A". Note that if the printing paper 2 is pressure-sensitive paper, the wire W+ -Wz... is driven and the impact when the wire tip hits the paper 2 will cause the dot D... to be recorded, but in the case of plain paper. An impact is applied via the ink ribbon 8 as shown in FIG.

FIG. 3 is a sectional view showing the internal structure of the print head 5, illustrating a release type print head. 9 is an iron core around which an excitation coil 10 is wound. A magnetic block 13 and an armature (plate spring) 14 are attached to the yoke portion 11 connected to the iron core 9 via a permanent magnet 12 in this order. A wire W is attached to the tip of the armature 14, and the armature 14 is normally attracted to the iron core 10 by magnetic flux from the permanent magnet 12. However, when the excitation coil 10 is energized to generate magnetic flux in a direction that cancels out the magnetic flux generated by the permanent magnet 12, the armature 1
4 is released from the iron core 9. Since the armature 14 is made of a leaf spring, the wire W moves in the direction of arrow a2 due to its elasticity when released from the iron core 9, advances from the tip of the print head shown in FIG. Add Inbaku to 2.

FIG. 4 is a plan view of the leaf spring that constitutes the armature 14 in this way. The armatures 14 are arranged radially, and their respective outer ends are connected by a ring-shaped portion 15 to form an integral structure. And each leaf spring 14.
A wire WI -Wz... is attached to the inner end of.... By forming the leaf springs 14 into an integral structure in this way, the leaf springs 14 can be assembled simultaneously, making assembly and adjustment easier.

The tips of the wires W1, Wz, etc. attached to the inner ends of the leaf springs 14, which are arranged radially as shown in FIG. The wires W1, Wz, . . . are gradually deformed so as to form two rows in a staggered manner. If this amount of deformation is large, the wear during sliding in the wire guide section will also be large, so the inner ends of the leaf springs 14 are stretched as far as possible toward the center C, and the wire W1 is placed at a position closer to the center C.・It is desirable to install Wz... Further, in the case of a print head for printing Kanji characters, more wires WI - Wz . . . are required, and in reality, U wires are used. In order to print such complicated characters, more wires, electromagnets for driving the wires, armature plate springs 14, etc. are required.

In this way, in order to increase the number of leaf springs 14... and prevent rapid deformation of the wires W1, Wz..., the width of the inner end of each leaf spring 14... should be reduced, and each It is necessary to make the interval (gap) between the inner ends of the leaf springs 14 as small as possible.

[Prior art and its problems]

Fig. 5 shows a conventional example of a method for manufacturing a leaf spring of an integral structure with small spacing between the leaf springs.
■It shows a cross section of the position. As shown in (a), resists 16a and 116b are applied to both sides of the leaf spring material 12a, except for the portions that will become the gaps G between the leaf springs 14, and the resists 16a and 16b are used as masks to perform etching. Let's do it. Then, as shown in (b), the resist 16a
, 16b is etched away except for the applied portion, a gap G is formed, and the radial plate springs 5-14 are formed.

6(a) and 6(b) are enlarged views of the progress of etching when forming the gap G by etching in this manner. As mentioned above, it is desirable that the gap G is as small as possible, but as shown in (a), if the gap G is made too small, the resists t・16a, 16b
The lower side of the resist is etched in large quantities, and the gap after removing the resist becomes larger than the designed value. To prevent this, (
As shown in (b), the gap G must be made large to some extent from the beginning, and it is necessary to have a small size (about the same as the thickness of the leaf spring).

[Purpose of the invention]

An object of the present invention is to eliminate such problems in the conventional manufacturing method of leaf springs, and to make it possible to further reduce the gears between the leaf springs.

[Structure of the invention]

The technical means according to the present invention taken to achieve this object is a method of processing a plurality of integrally connected leaf springs so that the gap between adjacent leaf springs becomes small, 6- At least a minute gap forming part. In the region including the small gap forming part, one side of the leaf spring itself is etched from the opposite direction every other time until the gap between adjacent leaf springs is penetrated.

[Embodiments of the invention]

Next, examples will be used to explain how the method for manufacturing a slope spring according to the present invention is actually implemented. FIG. 7 is a cross-sectional view showing, in order of steps, an embodiment of the method for manufacturing a leaf spring according to the present invention. First, as shown in (A), resists 16a and 16b are applied to only one side of each leaf spring portion of the leaf spring material 14a.

Furthermore, the coated surfaces of the resists 16a and 16b are reversed for every other leaf spring with the gap G as the boundary. When etching is performed using the resists 16a and 16b as a mask, only the lower surface of the first leaf spring 141 is etched, and only the upper surface of the second leaf spring 142 is etched, as shown in (b). Below each leaf spring 143.144.
... are etched alternately from top to bottom. When both the upper and lower surfaces of the leaf spring itself are etched by at least 1/2 of the board thickness, the upper and lower etched parts pass through each other in the gap G, and the leaf springs 14 are separated.

Finally, when the resists 16a and 16b are removed, every other leaf spring 141.1 has different vertical pressure as shown in (c).
42... is completed.

FIG. 8 is a sectional view showing a pattern in which the upper and lower etched portions penetrate at a gap portion G. In this way, if the adjacent plate blades themselves are etched from the upside down direction and penetrated at the gap G, the etched surface is wide as in the case of Fig. 6 (b), so over-etching of the bottom surface of the resist is prevented. .

Therefore, the gap G can be made extremely small by making the distance between the adjacent resists 16a and 16b very small.

Immediately after penetration, a sharp part remains in the gap, but
When etching is performed for a further short time, only the crispy portions having a small cross-sectional area are quickly etched away.

Etching from the upside down direction in this way only needs to be done on the inner end side of the leaf spring where the gap G needs to be made smaller.

The parts where the gap can be made sufficiently large are masked with resist on both the top and bottom of the leaf spring as in the past.
It is possible to prevent the plate thickness from becoming thinner than 1/2. Note that the inner end of the leaf spring is only used to attach wires W1, Wl, etc., and its function as a leaf spring is determined by the thickness of the plate, since the tip of the iron core 9 and the armature shown in Fig. 3 are attached in the area between the parts. Even if it becomes thinner, there is no problem.

〔Effect of the invention〕

As described above, according to the present invention, one side of the leaf spring itself is etched from the opposite direction every other leaf spring until the gap between the adjacent leaf springs is penetrated, so that the adjacent leaf springs are etched. The gap between the wires can be made as small as possible, resulting in higher wire density.

[Brief explanation of drawings]

Figure 1 is a plan view showing an overview of a wire dot type serial printer, Figure 2 is a perspective view of the print head, Figure 3 is a sectional view showing the internal structure of the print head, and Figure 4 is the armature plate inside the print head. FIG. 5 is a plan view showing the spring; FIG. 5 is a view showing the manufacturing method of the armature in 9-1 step order; FIG. 6 is an enlarged sectional view showing the progress of etching in this manufacturing method; FIG. 7 is a flat spring according to the present invention. FIG. 8 is a cross-sectional view showing the manufacturing method in order of steps, and FIG. 8 is a cross-sectional view showing the progress of etching by the manufacturing method. In the figure, 9 is an iron core, Wl, Wl... are wires,
14..., 141, 142... are armatures (plate springs), G is a gap, and 1.6a, 16b are resists, respectively. Patent applicant Fujitsu Ltd. agent □Patent attorney Minoru Aoyagi 10- Figure 1 Figure 3 Figure 5 (c) Futakuchi Roro Figure 6-8 Figure 46

Claims (1)

[Claims] A method for processing a plurality of integrally connected leaf springs so that the gap between adjacent leaf springs becomes small, The method for manufacturing an integral leaf spring is characterized in that one side of each leaf spring itself is etched from the opposite direction until every other leaf spring is penetrated by a gear lug between adjacent leaf springs.