JP2806871B2 - Print head used for dot impact printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a print head, and more particularly, to a print head used for a dot impact printer.

[0002]

2. Description of the Related Art A conventional example is disclosed in Japanese Patent Laid-Open No. 3-39.
No. 256 is known.

[0003] This conventional print head will be described with reference to the drawings.

FIG. 5 is a sectional view showing an example of a conventional print head, and FIGS. 6A and 6B are plan views of the yoke shown in FIG. 5 and sectional views taken along line AA 'of FIG. 6A, respectively. , FIG.
(A) and (b) are a plan view and a cross-sectional view taken along the line BB ′ of the sedge plate shown in FIG. 5, respectively, and FIGS.
6 is a plan view and a front view of the spring controller shown in FIG. 5, respectively.

Referring to FIG. 5, a head frame 14 having a tubular frontal head is shown. This head frame 1
In 4, a plurality of reciprocating print wires 11 and intermediate guides 13a to 13d for guiding the print wires 11 are provided side by side.

The drive unit for reciprocating the plurality of print wires 11 includes a yoke 7, an armature 5 having the print wires 11 attached to the tips, and a coil 8 for generating magnetism for driving the print wires. I have. The yoke 7 is, as shown in FIG.
a and the inner yoke 7b are integrally formed. In the inner yoke 7b, a controller shaft 20 of a sponge controller 18 for controlling a reaction force of the return spring 10, a shaft hole 21 in which the return spring 10 is incorporated, and a spring hole 17 are arranged concentrically. The plurality of yoke cores 7 a holding the coil 8 are also provided in the shaft hole 2.
1 and the spring holes 17 are arranged concentrically. An armature 5 is provided to face these yoke cores 7a. These armatures 5 are pressed against the yoke 7 by support rubbers 15.

[0007] As shown in FIG. 7, the armature 5 is positioned by an arm plate 5 having a positioning groove facing the armature 5. The other end of the armature 5 is pushed back in the return direction by the return spring 10 and is pressed and held against the stopper plate 1.

A coil 8 is wound around each yoke core 7A. When the coils 8 are selectively energized, the coils 8
Generates magnetic force. Armature 5 is support rubber 1
5 rotates the end on the side of the print wire 11 about the end pressed against the yoke 7. The print wire 11 attached to the tip of the armature 5 is driven in this manner to perform printing.

After printing, the power supply to the coil 8 is stopped so that the return spring 10, a suction plate 19 incorporated in the inner yoke 7 b interlocked with the return spring 10, and a spring controller 18 comprising a controller shaft 20.
The armature 5 rotates together with the print wire 11 (see FIG. 8). As a result, the upper surface of the armature 5 is pressed and held against the stopper plate 1.

[0010]

The first problem is that the armature is driven because the force for suppressing the reaction force of the return spring 10 is insufficient or the force for magnetically attracting the armature 5 is insufficient. The power will increase,
The printing operation cannot be stabilized and the printing head cannot be operated at high speed.

The reason is that the spring controller 18 is a means for suppressing the reaction force of the return spring 10.
Is shared with the magnetic flux generated by the coil 8 for magnetically attracting the armature 5.

[0012]

SUMMARY OF THE INVENTION The object of the present invention is as follows. (1) The reaction force of the return spring is suppressed, and the power for driving the armature is reduced while maintaining the force for magnetically attracting the armature. (2) According to the above (1), the printing operation is stabilized and the speed of the print head is increased.

Therefore, (1) a print head used in the dot impact printer of the present invention has a magnetic circuit composed of a yoke, a coil, and an armature, and drives a print wire by a rotational movement of the armature, thereby forming an ink ribbon. A print head used in a dot impact printer that prints by striking the printing surface through a wrapper, formed of an inner yoke that is integrally molded inside the yoke core of the yoke and wound with an inner coil, and a magnetic material with the same outer diameter as the yoke A protrusion having a length corresponding to the number of the armature return springs corresponding to the number of yoke cores is formed on the inner side of the disc, and a hole through which the plunger portion of the armature passes is formed on the protrusion, and the return spring for the armature is pressed. It is characterized by the installation of a hold plate (2) The print head used for the bright dot impact printer has a magnetic circuit composed of a yoke, a coil, and an armature, and drives the print wire by the rotational movement of the armature to strike the print surface via the ink ribbon. A print head used in a dot impact printer that performs printing by using an inner coil that moves an inner yoke for sucking a hold plate that compresses a return spring that acts as an operating resistance when the armature is magnetically attracted. (3) The print head used in the dot impact printer according to the present invention is characterized in that the inner coil of the above (2) is energized, and thereafter the yoke coil for sucking the armature is energized. (4) The print head used in the dot impact printer of the present invention has a magnetic circuit composed of a yoke, a coil, and an armature, drives a print wire by a rotational movement of the armature, and prints the print surface via an ink ribbon. In a print head used in a dot impact printer that performs printing by hitting an armature, a hold plate that compresses a return spring, which acts as an operating resistance when the armature is magnetically attracted, is moved, and then the armature is moved. (5) The print head used in the dot impact printer of the present invention, wherein the return spring compression mechanism of (4) is
A yoke provided with a yoke core to be magnetically attracted and an inner yoke for generating magnetic flux, and a hold plate formed of a plate-shaped magnetic material, one end of the hold plate is located between the yoke and the armature, and the other end is provided. Is located above the inner yoke and the return spring.

When the print head performs a printing operation, FIG.
As shown in (b), the inner coil 9 is energized, and the hold plate 4 hanging on the return spring 10 is magnetically attracted. After the hold plate 4 is magnetically attracted and the return spring 10 is compressed, the coil 8 is energized as shown in FIG. 2C, and the armature 5 is magnetically attracted without receiving the reaction force of the return spring 10 and the armature is attracted. Printed wire 1 brazed to the tip of 5
1 hits a printing surface and performs printing. Then, FIG.
As shown in (5), the current supplied to the inner coil 9 and the coil 8 stops supplying current, and the reaction force of the return spring 10 and the armature 5 are released. The armature 5 receives the reaction force of the return spring 10 and is pushed back by the stopper rubber 2 to complete one printing process.

[0015]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a print head according to the present invention, FIG. 2 is a view for explaining the operation of the print head of FIG. 1, and FIGS. 3 (a) and 3 (b) are views respectively. FIG. 3 is a plan view of the yoke shown in FIG.
FIG. 4 is a detailed view of the hold plate of the print head of FIG.

Referring to FIG. 1, a print head used in the dot impact printer according to the present embodiment has a magnetic circuit formed by a yoke 7, a coil 8 and an armature 5, and the armature 5 has a print wire 11 at its tip.
The armature 5 is positioned by an armature support 6, and one end of the armature 5 is pressed against a yoke 7 by a hold spring 3.

In this embodiment, as shown in FIG. 3, the inner coil 9 is integrally formed inside the yoke core 7a.
Has an inner yoke 7b around which is wound. In addition, a protrusion shown in FIG. 4 having a length to be applied to the return spring 10 for returning the armature 5 is formed at the tip of a disk formed of a magnetic material having the same outer diameter as the yoke 7. It has a hold plate 4 having a hole through which the plunger portion of the armature 5 passes. The outer peripheral portion of the hold plate 4 is fixed between the armature support 6 and the yoke 7, and the other end is located between the return spring 10 and the armature 5. Therefore, when the print head performs a printing operation, the inner coil 9 is energized and magnetically attracts the hold plate 4 applied to the return spring 10. After the hold plate 4 is magnetically attracted and the return spring 10 is compressed, the coil 8 is energized, and the armature 5 is magnetically attracted without receiving the reaction force of the return spring 10, and the print is brazed to the tip of the armature 5. The wire 11 strikes the printing surface and performs printing. Thereafter, the current supplied to the inner coil 9 and the coil 8 stops supplying current, and the reaction force of the return spring 10 and the armature 5 are released. The armature 5 receives the reaction force of the return spring 10 and receives the stopper rubber 2.
To complete the printing process.

[0019]

The first effect is that the electric power for driving the armature can be reduced.

The second effect is that the printing operation can be stabilized and the speed of the printing head can be increased.

The reason is that the inner yoke and the hold plate are provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a print head of the present invention.

FIG. 2 is a diagram for explaining the operation of the print head of FIG.

FIG. 3 is a detailed view of a yoke of the print head of FIG.

FIG. 4 is a detailed view of a hold plate of the print head of FIG. 1;

FIG. 5 is a sectional view showing an example of a conventional print head.

FIG. 6 is a detailed view of a yoke of the print head of FIG.

FIG. 7 is a detailed view of a scan plate of the print head of FIG. 5;

FIG. 8 is a detailed view of a spring controller of the print head of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stopper plate 2 Stopper rubber 3 Hold spring 4 Hold plate 5 Armature 6 Armature support 7 Yoke 7a Yoke core 7b Inner yoke 8 Coil 9 Inner coil 10 Return spring 11 Print wire 12 Main guide 13a to 13d Intermediate guide 14 Head frame 15 Support rubber 16 Soil plate 17 Spring hole 18 Spring controller 19 Suction plate 20 Controller shaft 21 Shaft hole

Claims (5)

(57) [Claims] 1. A dot impact device having a magnetic circuit composed of a yoke, a coil, and an armature, wherein a printing wire is driven by a rotational movement of the armature, and printing is performed by hitting a printing surface via an ink ribbon. In a print head used in a printer, the number of yoke cores corresponding to the number of yoke cores inside a disk formed of a magnetic material having the same outer diameter as the inner yoke and the inner yoke integrally formed inside the yoke core of the yoke and wound with an inner coil are adjusted. A protrusion having a length that hangs on the return spring for returning the armature is formed, and a hole through which the plunger portion of the armature passes is formed in the protrusion, and a hold plate that presses the return spring for returning the armature is provided. Print head used in a dot impact printer. 2. A dot impact device having a magnetic circuit composed of a yoke, a coil, and an armature, wherein a printing wire is driven by a rotational movement of the armature, and printing is performed by hitting a printing surface via an ink ribbon. In a print head used in a printer, a print used in a dot impact printer has an inner coil that moves an inner yoke for sucking a hold plate that compresses a return spring that becomes an operating resistance when the armature is magnetically attracted. head. 3. A print head for use in a dot impact printer according to claim 2, wherein the inner coil is energized, and thereafter the yoke coil for sucking the armature is energized. 4. A dot impact device having a magnetic circuit composed of a yoke, a coil, and an armature, wherein a printing wire is driven by a rotational movement of the armature, and printing is performed by hitting a printing surface via an ink ribbon. A print head for use in a dot impact printer, comprising: moving a hold plate for compressing a return spring that acts as an operating resistance when the armature is magnetically attracted, and then moving the armature. 5. The return spring compression mechanism has a yoke provided with a yoke core for magnetic attraction and an inner yoke for generating magnetic flux, and a hold plate formed of a plate-like magnetic material. 5. The print head according to claim 4, wherein one end is located between the yoke and the armature, and the other end is located above the inner yoke and the return spring.