JPS62111762A - Wire drive device for wire dot head - Google Patents

Abstract

PURPOSE:To reduce power consumption and at the same time, enable high-speed recording to be performed by utilizing an opposite side attraction force by a permanent magnet and a coil in addition to a spring force generated when an armature is released. CONSTITUTION:When recording is performed, a coil 13 is energized so that a magnetic field may generate in a direction where a magnetic flux toward a retracting side yoke 10b side is cancelled. Consequently an armature 14 is separated from the retracting side yoke 10b by the elastic power of a leaf spring 15, shifting to a striking side yoke 10a side. THus a gap between both yokes is narrowed, and if the coil 13 is deenergized at the time when the gap between the armature 14 and the striking side yoke 10a is narrower than the gap between the armature 14 and the retracting side yoke 10b, the armature 14 sags the leaf spring 15 by a magnetic flux from a permanent magnet 12 passing through the striking side yoke 10a, being attracted by the striking side yoke 10a. As a result, a wire 16 advances to perform recording. When the wire 16 is retracted, the coil 13 is energized so that a magnetic field may generate in a direction where a magnetic flux passing through the striking side yoke 10a is cancelled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wire driving device for a wire dot head.

[Prior Art] A conventional drive unit for this type of wire dot head is shown in FIGS. 2 and 3.

The example shown in FIG. 2 is a drive unit having a structure having one coil, and what is indicated by reference numeral 1 in the figure is an armature, which is connected to the yoke 5 side via a leaf spring 2.

The yoke 5 is formed in an L-shape as shown in FIG. 2, and a notch 5a is formed in the portion facing the tip of the armature 1 and the leaf spring 2 into which these can be freely fitted. has been done.

The proximal end of a wire 7 is fixed to the distal end of the armature l.

On the other hand, what is indicated by the reference numeral 6 is a core, one end of which faces one end of the yoke 5 and the armature 1, and is also formed in an L-shape, and the other end is connected to the yoke 5 via a permanent magnet 4. has been done.

Further, a degaussing coil 3 is wound around a portion of the core 6 facing the armature 1.

Further, the magnetic flux of the permanent magnet 4 is generated as shown by the chain line in FIG.

One set of drive units having such a structure exists for each wire, and in reality, a large number of drive units, for example 24 Jf units, are arranged radially to constitute a wire drive device.

In the drive unit having the structure as described above,
The recording operation is performed as follows.

That is, during non-recording, the current to the degaussing coil 3 is cut off, and the armature I is attracted to the core 6 side with the leaf spring 2 being elastically deformed by the magnetic force of the permanent magnet 4.

In this state, the tip of the wire 7 is retracted from the tip of the case of the head (not shown) or is in the same plane as the tip, and is not in contact with the ink ribbon or the like.

Subsequently, current is supplied to the degaussing coil 3 according to the recording command. This current is applied in such a way that a magnetic field is generated in a direction that cancels the magnetic force of the permanent magnet 4, so that the attraction force of the permanent magnet 4 disappears, and the elastic force of the leaf spring 2 causes the armature 1 to separate from the tip of the core 6. The wire 7 advances and dots are recorded on the recording paper via an ink ribbon or the like.

A wire dot head having a drive unit with such a structure is called a spring-driven wire dot head.

On the other hand, the example shown in FIG. 3 includes a coil for accelerating acceleration.

In FIG. 3, the same or corresponding parts as in FIG. 2 are given the same reference numerals.

In the example shown in FIG.
Another yoke 8 is provided on the opposite side.

An acceleration promoting coil 9 is wound around one end of the yoke 8 so as to face the degaussing coil 3 and sandwiching the armature I therebetween.

In the above-described structure, during non-recording, the armature I is attracted to the core 6 side by the magnetic force of the permanent magnet 4, similar to the example shown in FIG.

In this state, the acceleration promoting coil 9 is not excited.

On the other hand, during recording, current is supplied to the degaussing coil 3,
In order to cancel the attractive force of the permanent magnet 4, the armature 1 is separated from the core 6 by the elastic force of the leaf spring 2, as in the above-described example.

At the same time, current is also supplied to the acceleration promoting coil 9 side.

Therefore, the armature 1 released from the core 6 is further attracted by the force of the magnetic field generated by the acceleration promoting coil 9 in addition to the force of the leaf spring 2, accelerating the moving speed of the armature 1 in the recording direction.

Furthermore, when returning the released armature 1, the current to the degaussing coil 3 remains cut off, and when current is passed in the opposite direction to the acceleration promoting coil 9, the magnetic force of the permanent magnet 4 increases, and the armature 1 It is attracted to the core 6 side at a higher speed.

If such a structure is adopted, wire dot recording can be performed at higher speed.

[Problems to be Solved by the Invention] When the structure shown in FIG. 2 is adopted, the recording speed depends on the return force of the leaf spring 2. The only option is to use a leaf spring with a large spring force, and to do this, the attractive force of the permanent magnet 4 must be increased, and the degaussing coil must also be made large to generate a large demagnetizing magnetic field. It is not possible to meet all of the requirements, and there are limits to high-speed recording.

Further, if the structure shown in FIG. 3 is adopted, it is possible to perform considerably high-speed recording, but if such a structure is adopted, an acceleration promoting coil 9 is required in addition to the degaussing coil 3.
There are problems such as increased power consumption, complicated wiring, heat generation, etc., and the size inevitably increases.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a yoke in which a striking side yoke is formed at one end and a return side yoke at the other end, and a yoke formed on the striking side and the returning side. A core disposed between the side yokes and integrated with the yoke via a permanent magnet, and a core connected to the tip of this core via a leaf spring, and facing surfaces of the striking side yaw and the return side yoke. A structure is adopted in which a wire-driving armature is placed in between and close to the return side yoke, and a coil is wound around the core.

[Function] When the above-described structure is adopted, the armature is attracted to the return-side yoke against the elastic force of the leaf spring when not recording. Then, according to the recording command, a current is supplied to the coil in a direction that cancels the magnetic flux of the permanent magnet. Then, the armature moves away from the return-side yoke due to the elastic force of the leaf spring and approaches the striking-side yoke, reducing the gap between the two. This increases the magnetic flux of the permanent magnet flowing to the striking-side yoke, causing the armature to move toward the striking-side yoke. It is suddenly attracted to the yoke.

This action of the armature advances the wire and creates a dot record.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

FIG. 1 explains one embodiment of the present invention, and shows a drive unit that is one element constituting a wire dot head.

In the figure, the reference numeral 10 indicates a yoke, which has an angular C-shape as a whole, and one end of which is connected to the striking side yoke 1.
0a, and the other end is a return side yoke 10b.

A core 11 is fixed to the center of the yoke 10 via a permanent magnet 12, and a coil 13 is wound around the core 11.

The tip of the core 11 is bifurcated, into which an armature 14 is fitted and connected to the core 11 by a leaf spring 15.

One end of a wire 16 is fixed to the other end of the armature 14.

The armature 14 has a yoke 10a on the striking side and the return side.
, 10b, but is located closer to the return side yoke 10b.

Next, the operation of the drive unit configured as above will be explained.

During non-recording, the magnetic flux Φ from the permanent magnet 12 is
It passes through the core 11 as shown by the chain line in the figure, and the armature 1.
A closed loop is formed which returns to the permanent magnet 12 via the striking side yokes loa and return side yokes loa and 10b via the coil 13, and no current is supplied to the coil 13.

In this state, the gap between the armature 14 and the return side yoke 10b is
The return side yoke 10 is smaller than the gap between the
More magnetic flux is guided to the b side, and the armature 14 bends the leaf spring 15 and is attracted to the return side yoke 10b, and while the wire 16 is being pulled in, it is not returned when recording is desired. Side yoke 1, O
The coil 13 is energized so that a magnetic field is generated in a direction that cancels the magnetic flux toward the b side.

Then, the elastic force of the leaf spring 15 causes the armature 14 to
moves away from the return side yoke 10b and toward the striking side yoke 10a, thereby reducing the gap between the two.

The gap between the armature 14 and the striking side yoke 10a is the gap between the armature 14 and the returning side yoke 10b.
When the gap between the coil 13 and
When the power is cut off, the armature 14 bends the plate spring 15 due to the magnetic flux from the permanent magnet 12 passing through the striking side yoke 10a, and is attracted to the striking side yoke 10a4. As a result, the wire 16 moves forward and recording is performed.

When returning the wire 16, the coil 13 is energized to generate a magnetic field in a direction that cancels the magnetic flux passing through the striking side yoke LOa.
move away from a.

Then, if the current to the coil 13 is cut off when the gap between the armature 14 and the return side yoke Job becomes smaller than the gap between the armature 14 and the striking side yoke 10a, the magnetic flux passes through the return side yoke 10b. As a result, the armature 14 bends the leaf spring 13 and is attracted to the return side yoke 10b, and the wire 16 returns.

In this way, by combining one coil and one permanent magnet for one wire 16, high-speed recording can be performed, and a drive unit that is small and consumes little power can be obtained.

Note that the drive unit is rarely used alone, and a wire dot head is constructed by stacking the same number of drive units as the number of wires corresponding to the configuration of the dot matrix.

In addition, when the armature starts to move and the gap on the suction side becomes smaller than the gap on the release side, if you cut off the current to the coil and simultaneously excite it in the opposite direction, magnetic flux will be generated in the suction direction, which will speed up the suction operation. , even higher speed recording can be performed.

[Effects of the Invention] As is clear from the above description, according to the present invention, in addition to the spring force when the armature is released, the attractive force from the opposite side of the permanent magnet and coil is used, so power consumption is reduced. A wire dot head that is small and capable of high-speed recording can be obtained.

Furthermore, compared to a spring-driven wire dot head with an acceleration promoting coil, the number of coils can be reduced by one, the overall structure can be simplified, heat generation can be suppressed, and costs can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a plan view of a drive unit illustrating an embodiment of the present invention, and FIGS. 2 and 3 are plan views of drive units illustrating different conventional structures. 10a...Blowing side yoke 10b...Returning side yoke 11...Core 12...Permanent magnet 13.
... Coil 14 ... Armature 15 ...
・Plate spring 16... Wire 5gl unit 1st flat opening (Fig. 1, 3rd section) plan view Fig. 2 6 ends, 6 movements 1 Nizu Fn (2) No. Figure 3

Claims (1)

[Claims] a yoke having a striking side yoke formed at one end and a returning side yoke formed at the other end; a core disposed between the striking side and returning side yokes and integrated with the yoke via a permanent magnet; It is connected to the tip of this core via a leaf spring,
and a wire-driving armature disposed between opposing surfaces of the striking-side yoke and the returning-side yoke and close to the returning-side yoke, and a coil wound around the core. Wire drive device for wire dot head.