JPH0276745A - How to manufacture wire dot printer print head parts - Google Patents

Abstract

PURPOSE:To make possible the easy removal of assemblies after annealing and the subsequent easy assembling of printing head component by piling up pairs of assemblies in the same direction, then holding them tightly with two press fixtures and magnetically annealing them under pressure after heating in the presence of a non-oxidative gas atmosphere for a specified time. CONSTITUTION:A yoke 17, a ring A18 and a ring B23 are stacked together in that order between two press fixtures 1 to constitute pairs of assemblies, then these pairs of assemblies are piled up and are held with positioning pins 9 after being positioned using the latter. After this, a nut 2, a hexagon nut 3 and a washer 4 are used to tighten the assemblies. In addition, ceramic powder is applied to the both surfaces of the ring B25 so that it can easily be removed after annealing. Alternatively, a stainless spacer is held between the both surfaces and set together. The paired yoke 17, ring A18 and ring B23 sandwiched between the press fixtures are combined together with the pairs of assemblies, then these are magnetically annealed in the presence of an H2 gas atmosphere at 900 deg.C for 3 hours and are left alone until a furnace cools off completely.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing print head parts for wire dot printers used as output terminals for various computers.
Hereinafter, this will simply be referred to as a head component manufacturing method. ).

Conventional technology Print heads have become faster in recent years, and, for example, 24-dot print heads have been commercialized that can print kanji characters at 60 to 100 characters per second (for example, the 24-dot print head has been commercialized with a printing speed of 60 to 100 characters per second (for example, according to the Research and Practical Application Report No.
Volume 8, No. 2, Fine Wire Dot Type Kanji Printer).

The conventional print head as described above will be described below with reference to the drawings.

Conventionally, this type of print head has had a configuration as shown in FIGS. 3 and 4.

Figure 3 is a side sectional view of a conventional print head, and Figure 4 (
a) and (b) are a detailed plan view and a detailed side view of the same print head movable body. In the same figure, // is a printing needle whose one end is fixed to the tip of the lever 12, and the tip of the printing needle is attached to the cylinder body 1.
3 is guided into the guide hole of the bearing lIA held by the bearing IIA. lj is a leaf spring fixed to one end of the lever 12;
An actuating body 16 is fixed to one side of the leaf spring /1, and the other end of the leaf spring /J'' is sandwiched between a ring A11r and a ring f323 and fixed with a screw P. 2
0 is the core side wall, 21 is the core ball, and 2 is attached to the core ball.
A degaussing coil 22 is arranged at the outer station of /.

A plurality of actuating bodies 16 and leaf springs lj are arranged in a ring shape, and core balls 2/ are arranged to face the actuating bodies 16. The permanent magnets are arranged in a ring shape on the core side wall 2θ. The yoke/7 is provided with a plurality of protrusions so as to embrace the side surface of the actuating body 16.

The operation of the print head configured as described above will be explained below.

In the above configuration, the magnetic flux of the permanent magnet 19 is
0 and core ball 21, and is further returned to the permanent magnet l from the side surface of the actuator 16 via the yoke 17, rings A/♂, and ring B23. Therefore, the actuating body /4 is sucked toward the core ball 2/, that is, downward, by the magnetic flux of the permanent magnet, and the leaf spring /! It is in a bent state.

Next, when a current is applied to the degaussing coil λ2, the magnetic flux of the permanent magnet /2 is canceled and the attractive force of the actuating body /4 is reduced, so that the actuating body /B is accelerated upward by the restoring force of the leaf spring lj. At this time, the printing needle l/ protrudes from the bearing lj and impacts the ink ribbon (not shown) to perform dot printing. Furthermore, when the current in the degaussing coil 22 is stopped, the actuating body 16 is attracted again by the magnetic flux of the permanent magnet, as described above.
The printing needle /l returns to its original position.

Dot matrix printing is performed by operating the printing needle 11 at appropriate times while scanning the print head left and right, with the above operation being considered as one cycle.

Problems to be Solved by the Invention The problems of the conventional print head configured as described above will be explained with reference to FIG.

Ring A/f and ring f32 forming part of the magnetic circuit
In order to simultaneously improve the magnetic properties of the yoke 3 and the yoke 17 and correct the warpage before annealing, the yoke 17, the ring A/r, and the ring B are placed between two polished flat press jigs.
The ring B23 and yoke 17 of the adjacent pair of assemblies were stacked together to form a pair of assemblies. For diffusion bonding, these were removed and the bonded yoke 1
It took a lot of effort to sandwich the leaf spring between the ring kit of 7 and ring A/r and ring B23 and reassemble it.

Means for Solving the Problems The present invention provides a yoke for a wire dot printer print head;
A ring B, which holds a leaf spring fixed to a ring A and an actuating body together with the ring A, is coated with ceramic powder on both sides of the ring B, and stacked one on top of the other in order to form a paired assembly. The pair of assemblies are stacked in the same direction, sandwiched and fixed between two press jigs, heated for a predetermined time in a non-oxidizing gas atmosphere, and magnetically annealed while applying pressure. An alternative method for manufacturing wire dot printer printhead components with stainless steel spacers.

Function The present invention positions the yoke, rings A and B as a set, and forms a paired assembly by coating both sides of ring B with, for example, ceramic powder or sandwiching stainless steel spacers. The pair of assemblies are stacked in the same direction, sandwiched between two polished flat press jigs, and magnetically annealed while applying pressure, whereby the yoke and ring A are diffusion bonded in a positioned state. However, the ring B is not diffusion bonded by the ceramic powder and can only be easily removed.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a front view of a press jig holding a component in an embodiment of one step of the head component manufacturing method of the present invention, and FIG. 2(a)
Figure is the yoke of the print head parts, (a) is the top view, (b) is the top view.
The figure shows a side view, FIGS. 2(b) and 2(C) show a ring B and an IJ ring A of print head components, and FIGS. 2(a) and 2(b) show a plan view and a side view, respectively.

In FIG. 1, the press jig / is made of SK hardened steel with a hole in the center for passing a bolt through, and both surfaces At and B6 are polished.

Figure 1 shows the yoke/7 between these two press jigs l.
, Ring A/r, and Ring B23 are stacked in this order to form a pair of assemblies, and the multiple pairs of assemblies are stacked and positioned and sandwiched using the positioning pink, and the nut 2, hexagonal bolt 3, and washer ≠ are Shows the state in which it is used and tightened.

Further, in order to easily remove the ring f323 after annealing, for example, ceramic powder is applied to both sides of the ring f323, or stainless steel spacers are placed on both sides, and the ring f323 is overlapped with the yoke 17 and the ring AI♂.

Yoke/7 held in the press jig L, ring Ait
A plurality of pairs of assemblies of the ring f323 are stacked one on top of the other, and held at 900° C. for 3 hours in an H2 gas atmosphere, for example, for magnetic annealing, and then cooled in a furnace.

Effects of the Invention According to the present invention, by magnetically annealing the ring and yoke while applying pressure using a flat press jig and a positioning bottle, yoke/7 and ring A/♂ are diffused in the assembled state. The ring B23 can be easily removed without being bonded by diffusion bonding.

Therefore, the number of steps required for assembling the yoke 17 and the rings A/Jr is reduced, and the ring B23 can be easily removed after annealing, which simplifies the method of manufacturing print head parts.

[Brief explanation of the drawing]

FIG. 1 is a front view of a press jig holding a component in an embodiment of one step of the head component manufacturing method of the present invention, and FIG. 2(a)
, (b) and (C) are the print head parts yoke and ring B.
SA, Figures (A) and (B) are front and side views, respectively.
Figure 3 is a side sectional view of the print head, Figures 4 (a) and (b)
shows a plan view and a front view of the printing needle. l pastry jig, 2 = nut, 3: hex bolt,
t: Washer, j: Surface A16: Surface B17: iC, f: ff
1D, Ta: Positioning needle, ll: Printing needle, 12=
Lever, /3: Cylindrical body, lψ: Bearing, lj: Leaf spring,
lt: Working body, /7: Yoke, lt: Ring A,
/: Permanent magnet, 20: Core side wall, 2/: Core ball, 22: Demagnetizing coil, 23: Ring B0 patent applicant / Patent attorney representing Matsushita Electric Industrial Co., Ltd.
Isao Abe Z: Fu 7/J'Nip A Yu 3
23゛゛〉7-6Figure 3 (Su(b) /2 16'Return Salary Figure 4 Procedures Amendment Book C O Type'ノCommissioner of the Patent Office
Mr. Fumiyoshi Yoshida■, Indication of the case Japanese Patent Application No. 63-229692 2 Name of the invention Method for manufacturing wire dot printer print head parts 3 Relationship with the case of the person making the amendment Patent applicant Address Minamicho, Kokubunji City, Tokyo 185 No. 3-12-11 December 20, 1988 6 Subject of amendment 11 Contents of amendment to the brief explanation of drawings column 1. Page 9 of the specification, lines 1 to 3 [2nd figure, ■, (Q...Side view,
Figure ^, ■, (Q is the print head parts yoke and ring BS
"A is a front view, and Figures 2 (a), (b), and (C) are side views," 2. Specification, page 7, No. 3.
Lines ~ 6th line ``Figure 2 (a) shows the side view of the print head...'' is changed to ``Figure 2 (Fig. Front view, Figure 2 (a), (b)
, (c) also show respective side views. 3. Correct the symbols in Figure 2 as shown in the attached sheet. Patent applicant: Patent attorney representing Matsushita Electric Industrial Co., Ltd.
Isao Abe Figure 2

Claims (2)

[Claims] (1) A yoke for a wire dot printer print head, a ring A, and a ring B that holds the leaf spring fixed to the actuating body together with the ring A. Apply ceramic powder to both sides of the ring B, and stack them in order to assemble the pair. A plurality of pairs of assemblies are stacked in the same direction, sandwiched and fixed with two press jigs, heated for a predetermined time in a non-oxidizing gas atmosphere, and magnetically annealed while applying pressure. A method of manufacturing wire dot printer print head parts. (2) The yoke for the wire dot printer print head, the ring A, and the ring B that holds the leaf spring fixed to the actuating body together with the ring A are assembled in pairs by sandwiching stainless steel spacers on both sides of the ring B in order. A plurality of pairs of assemblies are stacked in the same direction, sandwiched and fixed with two press jigs, heated for a predetermined time in a non-oxidizing gas atmosphere, and magnetically annealed while applying pressure. A method of manufacturing wire dot printer print head parts.