JPH06227002A - Impact dot head - Google Patents

Abstract

PURPOSE:To provide a small, lightweight and thin impact dot head. CONSTITUTION:Bobbin terminals 28A and 28B which are contacts of an exciting coil 20 and a flexible cable 29 for feeding electricity and the flexible cable are arranged in the range of movable height of an armature 16 and height of a spring 22. It is possible thereby to make the height which is occupied by the flexible cable 29, bobbin terminals 28A and 28B, etc., as small as possible and to obtain a small, lightweight and thin impact dot head.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact dot head of an impact printer which prints by electromagnetic energy.

[0002]

2. Description of the Related Art In recent years, impact printers that print with electromagnetic energy have become increasingly popular in terms of high quality and low price. Conventionally, the impact dot head of this type of impact printer generally has a configuration as shown in FIG. A conventional impact dot head will be described below with reference to the drawings.

FIG. 6 is a sectional view of a conventional clapper type impact dot head. 1 is an armature, 2 is a core, 3 is a yoke, 4 is a bobbin, and 5 is a coil wound around the bobbin 4. The left end of the armature 1 urged by a spring 7 supported by a spring holder 6 is pressed and held in line contact with the yoke 3.

Here, when a current is applied to the coil 5, the core 2 is excited, and the magnetic flux generated in the core 2 passes from the core 2, the armature 1, the yoke 3, and the core 2 through a magnetic circuit circulating. Then, an electromagnetic attraction force is generated between the armature 1 and the core 2 due to the magnetic flux in the air gap existing between the armature 1 and the core 2, and the armature 1 rotates while centering on the fulcrum of the left end portion of the core 2 Is sucked into. A wire 8 for printing is provided at the tip opposite to the fulcrum of the armature 1, and the wire 8 moves toward the platen 32 against the spring force of the return spring 9 as the armature 1 rotates. It collides with the upper ink ribbon 30 and prints on the paper 31.

Next, a method of supplying a current to the coil 5 will be described. The bobbin 4 is inserted through the through hole formed in the yoke 3 and the through hole 10a formed in the flexible base 10.
The bobbin terminals 11A and 11B provided on the lower part of the are protruding downward. Two windings 15A and 15B extending from the coil 5 are wound around the bobbin terminals 11A and 11B, respectively, and penetrate the land holes of the flexible cable 12 arranged on the lower surface of the flexible base 10, It is fixed to the land with solder. That is, the bobbin terminals 11A and 11B are contacts between the coil 5 and the flexible cable 12, and a current is applied to the coil 5 from the power source via the flexible cable 12.
A flexible cover 13 is provided on the lowermost surface of the head to prevent the tips of the bobbin terminals 11A and 11B from being exposed to the outside.

[0006]

In the conventional device described above, the armature 1 and the spring 7 are arranged above the yoke 3, and an armature stopper 14a for statically fixing the armature 1 to the initial position before the start of printing is provided. A head cover 14 to be held is provided above the armature 1 and the spring 7. The bobbin terminals 11A, 11B and the flexible cable 12 are arranged below the yoke 3,
Flexible cable 12 and bobbin terminals 11A, 1
In order to prevent electric leakage from 1B to the yoke 3 made of a conductive material, it is necessary to dispose the flexible base 10 made of a non-conductive material between the flexible base 10 and the yoke 3.

Furthermore, the flexible cover 13 for preventing the bobbin terminals 11A and 11B from being exposed to the outside is provided with the bobbin terminal 1.
It is provided below 1A, 11B and the flexible cable 12. As described above, since the conventional impact dot head is configured by arranging many components above and below the yoke 3, the overall height D cannot be reduced, and the impact printer is small in size. However, it has a problem that it cannot be made lighter and thinner.

Therefore, an object of the present invention is to provide an impact dot head which can be made small, lightweight and thin.

[0009]

To this end, the present invention provides a bobbin terminal, which is a contact point between a coil and a flexible cable, and a flexible cable, a range of movable height of the armature, and a spring for urging the armature toward the yoke. It is arranged in the range of height.

[0010]

According to the above construction, the overall construction can be made thinner, and the impact dot head can be made smaller, lighter and thinner.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of an impact dot head according to one embodiment of the present invention, and FIG. 4 is a sectional view of the impact dot head according to one embodiment of the present invention. 16
Is an armature, 17 is a core, 18 is a yoke, 19 is a bobbin, and 20 is a coil. By the spring 22 supported by the spring holder 21, the left end of the armature 16 is pressed against the yoke 18 in line contact with the yoke 18 in FIG.

The core 17 is excited by applying a current to the coil 20, and the magnetic flux generated in the core 17 passes from the core 17 to the armature 16, the yoke 18, and a magnetic circuit circulating with the core 17. At this time, an electromagnetic attraction force is generated between the armature 16 and the core 17 by the magnetic flux in the air gap existing between the armature 16 and the core 17. Due to this electromagnetic attraction force, the armature 16 is attracted to the core 17 while rotating around the fulcrum at the left end.

A print wire 25 is provided in the head base 23 at the tip opposite to the fulcrum of the armature 16 by a return spring 26 and a spring stopper 24.
It is urged in the direction of and stored.
The wire 25 collides with the ink ribbon 30 and the paper 31 on the platen 32 in accordance with the rotational movement of, and printing is performed on the paper 31 by the impact force of this collision.

The initial state of the armature 16 is determined by the upper surface of the tip of the armature 16 coming into contact with the armature stopper 33a provided integrally on the inner surface of the head cover 33. Further, this impact dot head has two shafts 2 penetrating the head base 23.
It is supported by 7A and 27B.

Next, a method of supplying a current to the coil 20 will be described. As shown in FIGS. 1, 2, 3, and 5, bobbin terminals 28 </ b> A and 28 </ b> B that penetrate the through hole 23 a of the head base 23 are provided above the bobbin 19. The protruding heights of the tips of the bobbin terminals 28A and 28B are set within the movable height of the armature 16 and the height of the spring 22. Two windings 15A and 15B extending from the coil 20 are wound around the bobbin terminals 28A and 28B, respectively, and the armature 1 on the upper surface of the head base 23 is wound.
6, the terminal plate 3 connected to the flexible cable 29 mounted within the range of the movable height of 6 and the height of the spring 22.
4 and is fixed to the land 35 by soldering.

The end portion 29 of this flexible cable 29
“A” is led out from the side surface of the impact dot head and connected to the power source of the printer main body, and the current is applied to the coil 20. The tips of the bobbin terminals 28A and 28B are covered with a head cover 33. In this way, the bobbin terminals 28A and 28B and the flexible cable 29 are
The overall height D of the impact dot head can be reduced by setting the connection structure of.

[0018]

As described above, according to the present invention, since the bobbin terminal and the flexible cable are arranged in the movable height range of the armature and the spring height range, the entire structure can be made extremely thin. A compact, lightweight, and thin impact dot head can be obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an impact dot head according to an embodiment of the present invention.

FIG. 2 is a top view of an impact dot head with a head cover removed according to an embodiment of the present invention.

FIG. 3 is a side view of an impact dot head according to an embodiment of the present invention.

FIG. 4 is a sectional view of an impact dot head according to an embodiment of the present invention.

FIG. 5 is a sectional view of an impact dot head according to an embodiment of the present invention.

FIG. 6 is a sectional view of a conventional clapper type impact dot head.

[Explanation of symbols]

 16 armature 17 core 18 yoke 19 bobbin 20 coil 22 spring 25 wire 28A, 28B bobbin terminal 29 flexible cable 33 head cover

Claims (1)

[Claims] 1. An armature, a printing wire, a yoke and a core made of an exciting member, a bobbin, a coil wound around the bobbin, a flexible cable for supplying a current to the coil, and the armature. An impact dot head that drives a wire to print on a print medium by rotating the armature by an electromagnetic attraction force, and a spring that biases a fulcrum of rotational movement of the armature toward the yoke side. An impact dot head characterized in that a bobbin terminal, which is a contact point between a coil and the flexible cable, and the flexible cable are arranged in a movable height range of the armature and a spring height range.