JPS59224365A - Wire-dot type printing head - Google Patents

Abstract

PURPOSE:To reduce sufficiently the width of the extreme and of an armature for increasing number of wires, by bending the extreme end of the armature and fixing the rear end of the wire in such a way that said particular end is engaged with the bent area. CONSTITUTION:In a yoke 8, an electric magnet consisting of iron core 9 and coil 10 is accommodated, and at the bottom of a side yoke 8A, a plurality of armature 1A provided with a plunger 11 are installed in a radial arrangement. Each individual armature 1A is in an inoperative position by contacting with a stopper 14 caused by pressure of a return spring 18 and at the moment when the plunger 11 is attracted, its extreme end makes a displacement by the specified distance and printing with dots is started by a wire 3. As this wire 3 is fastened to the inside of the end bent part of the armature 1A, the width of the extreme end of the armature can be reduced sufficiently for corresponding to an increase of number of wires and rubbing resistance at the time of printing operation can be kept from increasing and clarity of the print can also be improved.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to wire dot type printing, and in particular, to a wire dot type printing method, which has an improved coupling structure between a plurality of wires and an armature that protrudes and retracts the wires. Regarding printing, the structure of Rad.

(Prior Art) Printing devices (f-linters) are used in the binding of electronic computers and various electronic devices, and various types of print heads are used in such printing devices. One of them is wire dot printing.

For this wire dot type printing, multiple dots (for example, 9
Arranging up to 24 thin wires (for example, tungsten wires with a diameter of 0.2 mm) in rows, and controlling the protrusion (pressure contact) and retraction of each wire in synchronization with the lateral movement of the print head. In addition, it records characters such as letters and numbers on recording paper, as well as images.
Shock m) It is also one of the print heads. This type of wire dot type print head uses a plurality of electromagnets corresponding to the number of wires, an armature driven by each electromagnet, and a plurality of wires connected to the tip of each armature. Turn each electromagnet on and off.
By controlling the position of each armature on and off, the wires connected to the ends of the armatures are made to protrude (pressure contact) and retreat from the recording paper.

In this case, each wire is guided at several points along the way, but in order to reduce the loss due to sliding resistance, the rear end of each wire is moved as close as possible to the center. It needs to be made as small as possible.

However, in the conventional wire dot type print head, as shown in FIGS. 1 and 2, a hole 2 for wire insertion is formed at the tip of an armature 1, and a wire 3
After passing the rear end, they were joined together by soldering 4 using silver solder or the like.

However, in such a conventional method of connecting a wire and an armature, since the hole 2 is formed at the tip of the armature 1, the width B of the armature tip must be greater than a certain level and cannot be made smaller. For this reason, when increasing the number of wires to make printing clearer, the tips of the armatures 1 interfere with each other, so the rear ends of the wires 3 cannot be arranged near the center and may be arranged at a position slightly off the center. I have no choice but to colander. If the rear end of the wire 3 deviates from the center position, the wire will warp, causing an increase in sliding resistance at a portion of the guide, resulting in an increase in drive loss. For this reason, the bonding method shown in FIGS. 1 and 2 has a problem in that it cannot meet the demand for an increase in the number of wires.

(Objective) The object of the present invention is to eliminate the drawbacks of the prior art,
It is an object of the present invention to provide a φ wire dot type print head with a reduced armature tip width.

A feature of the present invention is that the tip of the armature is bent forward (along the wire), and the rear end of the wire is engaged with the inside of this bent portion and then brazed to connect them to each other. The purpose is to achieve the above objectives.

(Embodiment EA) Figures 3 to 6 show wire dot type printing according to the present invention.
1 is a diagram illustrating an embodiment of the present invention, and the present invention will be specifically described below with reference to these diagrams.

In FIG. 3, a boss member 7 made of plastic mold is disposed in a casing formed by combining the annoc teddy 5 and the lower body 6, and a boss member 7 made of plastic mold is placed around the hJs member by outsert molding. Side yoke 8A
are integrated, and the boss member 7 is engaged with the yoke 8. An electromagnet consisting of a core iron core 9 and a coil 10 wound around the core iron core 9 is attached inside the yoke 8, and an armature IA having a granger 11 is attached to the lower side of the side yoke 8A. As shown in FIG. 4, this armature IA and the grangers 11 fixed thereto are arranged radially corresponding to each of a plurality of (for example, 24) cores 9.

The magnetic flux path of the electromagnet is connected to the core 9 as shown by φ in FIG.
, a yoke 8, a side yoke 8A, and a plunger 11.

A back holder 13 is fixed within the lower body 6 by screws 12, and a stopper 14 is held in a recessed portion above the back holder. Thus, each of the armatures IA includes a post 15 fixed to the lower side of the side yoke 8A and a hole 16 into which the granger 11 is loosely fitted.
The back holder 13 and the screw 12 are pressed against the lower surface of the sine side yoke 8a by the plate 17, which is arranged at a plurality of positions in the circumferential direction, that is, corresponding to each armature IA. The proximal portion is held by the return spring 18 and the stopper 14, thereby holding it in a predetermined position. Therefore, in the normal state, each armature IA is placed in the lower non-operating position (retracted position) in contact with the cyst collar 14 by the return spring 18, as shown in FIG. When attracted, the tip of the spring 18 is displaced upward by a predetermined distance to reach the operating position.

A printed circuit board 20 is attached to the upper side of the yoke 8 via an aluminum spacer 19 for heat radiation. The electric circuit on the printed circuit board 20 and the coil 10 are connected to the terminal 2
It is connected via 1t22.

As shown in FIG. 4, a base end (rear end) of 30 wires (for example, a tungsten wire with a diameter of 0.2 arm) is connected to the tip of each of the armatures IA arranged radially. has been done. The wire 3 conducts electricity inside the boss member 7, and also connects the plurality of guides 23, 2.
4.25', 26 are slidably guided and extend to the upper end (print head tip) in FIG.

Therefore, by controlling the code signal introduced via the printed circuit board 20, a plurality of (for example, 24) coils 10
By controlling the energization to each of the armatures IA, the displacement of each armature IA is controlled, and thereby the recording paper 2 is
A predetermined character or image is recorded on the recording paper 27 based on the correlation with the control of the moving speed of the print head in the width direction. This printing operation involves the stamping operation of each wire 3 and the on/off operation of energizing each coil 10, which generates noise and heat, but the upper body 5 and lower body 6 are made of aluminum. At the same time, sound insulation and heat dissipation effects are achieved by interposing the aluminum spacer 19.

A weight 29 made of lead or the like is held inside the lower body 6, that is, below the pack holder 13 in the illustrated example, with a countersunk 28 interposed therebetween. Consideration is given to suppressing vibrations (particularly resonance phenomena) and accurately controlling the movement of each armature IA and each wire 3 coupled thereto.

In FIGS. 4 to 6, the tip of each armature IA is bent forward (in the direction of wire extension) at a substantially right angle to form a bent portion 30. The rear end of the wire 3 is brought into contact with the armature IA while being engaged with the inner corner of the bent portion 30, and soldered with silver solder 31 as shown in FIG.
It is combined with

In this way, each wire 3 can be brazed to the respective armature IA over a relatively long range including the bent portion 30, thereby increasing the bonding strength. Also, each armature IA
Since there is no need to provide a conventional hole (hole 2 in FIG. 1) at the tip, the width of the tip of the wire 3 is determined by the diameter (for example, 0.2 m) of the wire 3 as shown in FIG. It can be set to a fairly small value.

The plurality of wires 3 have, at their tip printing portions,
They are arranged in a line in the upper and lower diameters in Figure 4, but because the rear end (base end) is connected to each armature IA, they cannot be arranged in the same way as the tip, and as shown in Figure 4. Must be arranged in an arc or ellipse. In this case, the maximum deviation shown in FIG. 4 occurs between the rear end and the tip of the wire. This maximum deviation D is required to be as small as possible in order to reduce loss due to wire sliding resistance.

By the way, in the wire dot type print head of the present invention, as shown in FIGS. 4 to 6, the width of the tip end of the armature IA can be significantly reduced compared to the conventional one.
Even if the number of wires is increased, the maximum deviation D does not become much larger than in the conventional structure, and therefore it is possible to prevent an increase in sliding resistance, so it can sufficiently cope with the increase in the number of wires compared to the conventional technology. It is also possible to improve the clarity of printing or reduce loss.

(Effects) As is clear from the above description, according to the present invention, the armature tip width can be made sufficiently small. Specifically, this allows for an increase in the number of wires, as well as an increase in the sliding resistance of the wires during printing (power loss).
Therefore, a wire dot type print head can be obtained which can improve the clarity of the print or reduce the loss.

[Brief explanation of drawings]

1 and 2 are a plan view and a vertical cross-sectional view illustrating a joint between an armature and a wire in a conventional wire dot print head, and FIG. 3 shows the overall structure of an embodiment of a wire dot print head according to the present invention. The vertical sectional view shown in Figure 4 is printed in Figure 3. FIGS. 5 and 6 are a plan view and a side view showing the joints between each armature and each wire in the print head shown in FIG. 3; 1. IA... Armature, 3... Wire, 5.6
...Body (casing), 8...Yoke, 8A.
...Side yoke, 9...core, lO...coil,
11... Plunger, 14... Stop/#, 15
... Post, 17 ... Leaf spring, 18 ... Return spring, 20 ... Cylinder board, 23 to 26 ... Wire guide, 27 ... Recording paper, 30 ... Bending part , 31... Brazing. 27 331 Figure 4

Claims (1)

[Claims] (1) On-off control of multiple electromagnets, controlling the position of multiple armatures, and wire-dot printing in which the wire connected to the tip of each armature is pressed against the recording paper to print. A wire dot type print head according to the invention, wherein the tip of the armature is bent, and the rear end of the wire is fixed in a state engaged with the inside of the bent part.