JPS6027555A - Mobile body hollow lever for wire dot printer - Google Patents

Abstract

PURPOSE:To enhance the rigidity and massproductivity with a lighter weight by forming two shorter sides of a thin hollow prism with a rectangular cross-section to be convex or concave outwardly along the axis at the center thereof. CONSTITUTION:Two shorter sides 2-3 an 2-4 rectangular in the section of a hollow prism 2-B are bent at the center thereof to be convex outside the hollow prism 2-B along the axis thereof as shown by the 2-3' line in such a manner that two shorter sides 2-3 and 2-4 grow narrower gradually toward the printing wire mounting section 11 while two longer sides 2-1 and 2-2 presents a curved surface or a graded surface toward the printing wire mounting section 11. The printing wire mounting section 11 and the wire 1 are fastened on the end faces (a) and (b) convex-bulged parts of the shorter sides 2-3 and 2-4 with a solder 11' to enhance the rigidity of a hollow lever as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a lightweight and highly rigid wire drive mechanism for a so-called wire dot printer that selectively drives multiple printing wires to record impact pixels, which is necessary for increasing the speed of the printer. The present invention relates to a low-cost hollow lever for a movable body that can be mass-produced.

FIG. 1 shows the configuration of a wire drive mechanism of a conventional wire dot printer of this type. The printing wire l, the tip of the hollow lever 2, the base of the hollow lever, and the armature 3
are integrally connected to form a movable body. The movable body is connected to the other end of a plate panel whose one end is fixed to the fixed part io, and can vibrate due to the elastic deformability of the plate spring. A core portion faces the armature 3, and an armature-side yoke j is provided so as to surround approximately half the circumference of the armature 3 without contacting the armature 3. The magnetic flux created by permanent magnet 6 is
→ Armature side yoke j → Armature 3 → Core t →
It passes through a magnetic path from the core side yoke 7 to the permanent magnet 6, so that the armature 3 is constantly attracted to the core t against the leaf spring ≠.

In this state, when a current is passed through the drive coiler to generate a magnetic flux in the opposite direction to the above magnetic flux direction, the attractive force between the core r% armature 3 is eliminated, and the movable body starts to move due to the restoring force of the leaf spring ≠. . Although not shown in the figure, near the tip of the printing wire 1, paper, ribbon, and platen are placed at appropriate positions, and the printing wire 1 performs impulsive pixel recording. In recording using the printing wire 1, it is basically necessary to increase the repetition frequency. This objective is generally achieved by reducing the weight of the movable body, but at the same time the movable body must have sufficient rigidity to withstand the action of impact forces.

One possible way to do this is to create a hollow shell structure. For example, in Japanese Patent Application Laid-open No. Sho Jll-92122, a semi-finished product of a thin plate for manufacturing a hollow lever has been devised.

Fig. 2 shows an example of such a semi-finished product, in which 11 is the printing wire attachment part 12 to lhiro and /2' to t4f are the side forming parts of the hollow lever.
, ir', it, and tt', then bend the left and right sides as seen in the drawing from the printing wire attachment part ll, and overlap and join the side surface forming parts 13 and 13' and l≠ and l≠', respectively, to form the printing wire l. A hollow lever is formed with an attachment part it.

Figure 3 shows the upper surface (a) of the hollow lever obtained as described above.
) and side surface (b), and FIG. v is a sectional view thereof.

In this way, the side forming parts 13 and 13' and 7g and 144
′ are stacked on top of each other and these parts are joined by brazing, which requires a lot of processing time and is not suitable for mass production, making it difficult to lower the price. Also, it is difficult to guarantee accuracy, and the mass distribution of the movable body is not constant.

In order to solve these drawbacks, the present invention has a rectangular cross section,
A thin drawn seamless pipe is formed, cut into a hollow prism of a predetermined length, the longitudinal direction of the rectangular cross section of the hollow prism is maintained in the axial direction of the printing wire, and the rectangular cross section of the hollow prism is cut. Because the λ short surfaces of the hollow prism become thinner toward the tip of the movable lever, and the two long surfaces of the rectangular cross section of the hollow prism become curved or sloped surfaces toward the tip of the movable lever, The center portions of the two short surfaces of the rectangular cross section of the hollow prism are bent over the axis of the hollow prism so that the convex shape on the outside of the hollow prism becomes concave on the inside, and The two long surfaces of the rectangular cross section of the hollow prism are extended to the tip of the hollow prism, bent to surround the side surfaces of the printing wire, and the side ends of the two long surfaces are butt-molded. In addition, the tip surface of the convex or concave bent portion of the short surface of the hollow prism, the printing wire, and the periphery of the side surface of the printing wire formed by the λ long surfaces are integrally fixed together by brazing. The invention will be described in detail with reference to the drawings of one embodiment.

FIG. 5 shows a hollow prism λ-B constituting the hollow lever for a movable body of the present invention, which has a rectangular cross section as shown and is formed by cutting a thin drawn seamless pipe to a predetermined length. That is, the two long planes of the rectangular cross section of the hollow prism 2-H are respectively represented by 2-/ and Co2, and the λ short planes are respectively expressed by 2-3 and Co≠. Hereinafter, in order to explain this, FIG.
The two short surfaces 2-3 and the tip part λ-ii of Co≠ are punched out using a press, and the printing wire attachment represents the state before molding of part 1/. //-/ and //-2 are hollow prisms λ-B
is an extension of one elongated plane λ-l and 2-2 of the rectangular cross section.

FIG. 7 shows a front view showing a partial cross section of the hollow lever for a movable body according to the present invention, FIG. 5 is a top view thereof, FIG. 2 is a left side view of FIG. 7, and FIG. FIG. 7 is a sectional view taken along the line A-A in FIG. 7;

The method of forming the hollow lever λ for the movable body of the present invention illustrated so far is as follows: 2-3 and 2-4 of the hollow prismatic cord B shown in FIG.
The central part of the four faces is drawn along the axis of the hollow prism λ-B as shown by the 2-3' and Cope' curves in FIG. The two short surfaces 2-3 of the rectangular cross section of the hollow prism are bent outward so that they each have a convex shape.
As shown in the figure, the λ-μ and λ-μ planes gradually become thinner toward the printing wire attachment part//, and the two elongated planes 2-/ and 2-2 of the rectangular cross section of the hollow prism are the same. , is configured to have a curved surface or a sloped surface toward the printing wire attachment part //. Also, Fig. 7(a) and Fig. 7(b)
As shown in Figure 3, the long plane λ-1 and the core 2 of the hollow lever
It is also good to reduce the weight of a hollow lever by drilling a hole in the meat plate near the tip of the hole.

Figures 7 and 7 are diagrams showing the printing wire installation part/l.
2- and 2-2 in the figure are pressed and bent to surround the side surface of the printing wire l, and then 1i-i and it t-
The end faces of x are butted and molded.

As shown in the partial cross-sectional view of FIG. 7, the printing wire l shown by the imaginary line is attached to the part ll, and the printing wire is attached to the part i by the solder ii'.
t and printing wire/l and two short surfaces 2-3 and 2-hiro of the rectangular cross section of the hollow prism, end surfaces a and b of the convex overhang part
The hollow lever for the movable body is constructed so as to increase the rigidity of the whole.

FIG. 11 shows another embodiment of the present invention, in which a front view of the hollow lever 2 for a movable body, FIG. 12 is a top view of FIG. 11, FIG. 13 is a left side view of FIG. ii, and FIG. The figure shows arrow A in figure it.
-A sectional view. The method of forming the hollow lever λ for the movable body is as shown in 5, as shown by the line 2-3' in FIG. , overflowing to the axis of the hollow prism, 2-3' and λ-v' in Figure 1/Fig.
As shown in FIG. 12, the two short surfaces λ-3 and the corrugation surface of the rectangular cross section of the hollow prism are bent into a concave shape inside the hollow prism B, as shown in FIG. The two long surfaces λ-l and 2-2 of the rectangular cross section of the hollow prism also become curved or sloped surfaces toward the printing wire attachment part //. It's set up like this. As shown in the partial cross-sectional view of Figure 1, the printing wire is attached to part ll, the printing wire l, the rectangular cross-section of the hollow prism, and the λ short faces 3 and the end face a of the concave folded part of the coil 1. The b portion is fixed to increase the rigidity of the entire movable body hollow lever.

Printing wire attachment part l shown in Figures 11 and 12
l is an extension of 2-1 and 2-2 in Figure 2 //-/
and ii-4 were bent by press processing so as to surround the side surface of the printing wire l, and the end faces of //-/ and /l-2 were butted and formed.

1st! The figure shows an example of an armature applied to the hollow lever of the present invention, and Figure 1 is a perspective view of an example of joining the hollow lever 2 according to the present invention to the armature 3, and a part of the armature 3 is shown in the hollow lever. This shows the case where it is inserted into one end and joined by welding or brazing.

As described above, the present invention is characterized in that the central part of the λ short faces forming the hollow prism 2-B is bent around the axis and bent outward into a convex or concave shape, and the two short faces are attached to the wire. By forming the lever so that it gradually becomes thinner toward the end, it is possible to provide a hollow lever with a high rigidity/weight ratio and good mass balance.

Therefore, it is effective in increasing the repetition frequency of the printing wire. Further, since the shape of the hollow prism 2-B is simple, its molding is suitable for mass production as described above, and is suitable for low cost and high reliability. These can contribute to higher speed, higher reliability, and lower cost of wire dot type print heads.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of the wire drive mechanism of a wire dot type print head, Figure 2 is a diagram showing the conventional shape of a thin plate for forming a hollow lever, and Figure 3 is a side view of the hollow lever obtained by Figure 2. and top view, the reference figure is a cross-sectional view of the hollow lever shown in Fig. 3, Fig. 5 is a perspective view of a hollow prism for forming a hollow lever according to the present invention, and Fig. 6 is a hollow of the hollow lever shown in Fig. 5. The wire attachment for printing the tip of the prism is a partially punched out figure to form a section, and FIG. 7 and FIG. 1/FIG. 12 are top views of FIGS. 7 and 11, and FIGS. 2 and 13 are left side views of FIGS. 7 and 1, and FIG. and FIG. 74A is a cross-sectional view taken along arrow A-A in FIGS. 7 and TI, and the first! The figure is a perspective view showing an example of an armature, and FIG. 1J is a perspective view of an example in which a hollow lever according to the present invention is joined to the armature. L...Wire for printing, K...Hollow lever, 3...
・Armature, ≠...plate spring,! ... Armature side yoke, 6... Permanent magnet, 7... Core side yoke, ? ... Core, Ri... Drive coil, lO... Fixing part, IT... Printing wire attachment part, λ-B...
- Hollow prism, 2-7.2-2... λ long surfaces (side surface forming part) of rectangular cross section of hollow prism and hollow lever, 2-3.
．． 2-Hiro... Two short surfaces (upper and lower surface forming parts) of a hollow prism and a rectangular cross section of a hollow lever, 2-3', J-j'...
The central mortar and concave fold line of the 2-3.2-≠ surface of the hollow prism, /I'...Full % a+ b...2-3.2-
Convex and concave folded end faces of j-plane. Patent applicant Akira/l] Figure 2 Figure 3 Figure 4 Figure 5? -4 Figure @Figure 7

Claims (1)

[Claims] A hollow lever for a movable body in a wire drive mechanism of a wire dot printer is a hollow prism made by cutting a thin-walled drawn seamless pipe with a rectangular cross section to a predetermined length,
The central part of the two short surfaces forming this is formed into a convex or concave shape outward along its axis, and the λ short surfaces are formed so as to gradually become thinner toward the wire attachment part, A hollow lever for a movable body for a wire printer, characterized in that the tip extension surface is bent so as to surround the side surface of a printing wire, and both end surfaces are butted and fixed, and the printing wire is fixed to the wire attachment part. .