JPS59184669A - Printing head for dot printer - Google Patents

Abstract

PURPOSE:To prevent adverse effect on other drive magnetic circuits with increase of consumed magnetic flux as leaked magnetic field by attaching a by- pass yoke to the side of a magnetic circuit made up of permanent magnet through a spring material. CONSTITUTION:When flowing a demagnetizing current to a demagnetizing coil 7 in such a direction that a magnetic field (c) in the direction of erasing a magnetic field (b) by the permanent magnet is generated on the end face of a yoke 2', an armature 3 attracted by the yoke 2' in the magnetic field of the permanent magnet jumps out upwards by repulsion of a plate spring 4 owing to the demagnetization of the magnetic field in the magnetic gap, and a printing pin 5 is driven in the direction of arrow. The magnetic flux (b) flowing by demagnetizing current is generated as a leak magnetic field (d) on the periphery of the permanent magnet 1, but the by-pass yoke 8 is attracted by the leak magnetic field (d).

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a print head for a two-dot wire printer, particularly for printing characters such as Chinese characters using a large number of arranged printing wires, I made it possible to print characters such as alphabets, numbers, and kana characters using 4J parts.
This invention relates to a print head for a dot printer.

Structure of conventional examples and their problems In recent years, advances in computers and peripheral technology have led to advances in computer-based information processing. The need for this is increasing year by year. Along with this, the development of various printers is progressing, and wire dot printers that can print on various types of paper and are inexpensive are rapidly developing. A print head for a Chinese character printer using a wire dot system in which a plurality of driving elements are arranged has been developed, and measures for speeding up, miniaturization, and low noise are desired.

A conventional print head for a dot printer will be explained below.

FIG. 1 shows a cross-sectional view of the structure of a single print head for a conventional dot printer, where 1 is a permanent magnet and 2 is a yaw that forms a magnetic circuit.

3 is an armature installed in the gear knob of the magnetic circuit. The armature 3 is attached to a base 6 via a leaf spring 4, and the armature 3 is attached to a base 6 via a leaf spring 4.
A printing pin 5 is attached to the other end. 7 is a degaussing coil wound around the outer periphery of the yoke 2.

The operation of the conventional dot printer print head configured as described above will be described below.

In the gear knob of the magnetic circuit composed of two yokes 2 using a permanent magnet 1, there is an armature to which a printing pin 5 and a leaf spring 4 are attached. It is attracted to the lower yoke 2'.

Then, in response to the print signal, a current is applied to the degaussing coil 7 wound around the outer circumference of the lower yoke 2' in the direction of canceling the magnetic field, so that the armature 3 is separated from the lower yoke 2' and moved upward by the force of the plate pi and 4. Jump out. At the same time, a printing pin 5 attached to the armature 3 pops out, and printing can be performed by hitting the paper through the ink ribbon. After printing, the printing pin 5 and the armature 3 are returned to their original states by cutting off the current flowing through the degaussing coil.

However, in the case of a print head for a dot printer having the above-mentioned configuration, as shown in Figure 2, in practice, the print head has to be miniaturized, the assembly process can be performed easily and quickly, and costs can be reduced. In order to achieve this, a plurality of print heads for the dot printer are arranged on the circumference, and furthermore, magnets and yokes are integrated. Therefore, a problem arises in that the degaussing current required to drive each pin changes each time depending on the number of drive printing pins.This is because the magnetic circuit is integrated, The energy is concentrated in other magnetic gaps.

Therefore, since there was a slight lag in the timing at which the drive printing pin operated, an attempt was made to operate it last. Because the magnetic field demagnetized in other magnetic circuits concentrates in the gap in the magnetic circuit of the driving printing pin,
l! ! A much larger demagnetizing current is required compared to the magnetic current.

Therefore, in the conventional configuration, there is a problem in that it is necessary to use a method in which a degaussing current that is much larger than the drive degaussing current flowing through the pin is used to ensure smooth operation. It was shared.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and aims to reduce the overall power consumption by keeping the current driving each pin constant.

Structure of the Invention The present invention provides a bypass yoke that is attached via a spring material to the side surface of a magnetic circuit constructed using permanent magnets, and when a print signal is sent to a degaussing coil wound around the outer circumference of the yoke of one magnetic circuit. , the magnetic field of the permanent magnet is canceled, and the bypass yoke is attracted to the yokes on both end faces of the permanent magnet by the canceled magnetic flux, even when a plurality of print heads for a dot printer are arranged on the circumference. The present invention provides a complete print head for dot printers which has successfully reduced the degaussing current by eliminating the necessary port flow for driving each pin.

DESCRIPTION OF THE EMBODIMENTS FIG. 3 is a structural sectional view showing the configuration of a printing nozzle for a dot printer according to the present invention.

In FIG. 3, reference numeral 1 denotes a permanent magnet. Yaws 2 are fixed to both end surfaces of the permanent magnet 1, and a bypass yoke 8 is installed on the side surface of the permanent magnet 1 via a spring material 9 to the yoke 2. Also,
In the space of the magnetic gap 10 formed by the yoke 2,
Amateur 3 with printing pin 5 and spring spring 4 attached
is installed. The armature 3 is attached to a plate spring mounting base 6 via a plate spring 4. It's a size.

A degaussing coil 7 is wound around the outer periphery of the yoke 2'.The operation of the print head for a dot printer of the present invention constructed as described above will be explained below with reference to FIGS. 5 and 6.

5 and 6 are structural sectional views showing the operating principle of the print head for a dot printer according to the present invention.

FIG. 5 shows the state before the degaussing current is fully applied. From this state, the degaussing coil γ is connected to the permanent magnet 6 on the end face of the yoke 2'.
Asb=6 When a demagnetizing current is passed in a direction that generates a magnetic field C in the canceling direction, the armature 3, which had been attracted to the yoke 2' by the magnetic field of the permanent magnet, is moved to the magnetic gear 4. Since the magnetic field in the knob is demagnetized, the repulsive force of the leaf spring 4 causes the printing pin 5 to jump upward and be driven in the direction of the arrow a.

Here, when the demagnetizing current is applied, the magnetic flux of the permanent magnet 1 that was flowing at this moment is generated as a leakage magnetic field d in the periphery of the permanent magnet 1. The bypass yoke 8 attached via the sixth
As shown in the figure, it is attracted by the leakage magnetic field d. Therefore, according to the above configurations of the present invention, it is possible to prevent the magnetic flux demagnetized by the demagnetizing current from increasing as a leakage magnetic field and having an adverse effect on other drive magnetic circuits. Therefore, even if each printing pin and driving magnetic circuit are arranged on the circumference, the demagnetizing current can be kept constant without being affected by other magnetic circuits, and the demagnetizing current can be reduced. Effects of the Invention The present invention has the ability to reach the side surface of a permanent magnet through a piece of material, which is necessary to drive the printing pin. The magnetic current makes it possible to prevent the demagnetized magnetic flux from increasing as a leakage magnetic field and having a negative effect on other drive magnetic circuits. Even when the circuits are arranged around the circumference, the demagnetizing current can be kept constant without being influenced by other magnetic circuits, making it possible to reduce the demagnetizing current.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the structure of a single print head for a conventional dot printer, Fig. 2 is a schematic top view of the print head of Fig. 1 arranged on the circumference, and Fig. 3 is a diagram of an embodiment of the present invention. Structural cross-sectional view of the printing head alone, 4th section Ct 3rd varnish print head arranged on the circumference, 1TTi similar, schematic diagram, Fig. 6 and Fig. 6 explain the operating principle of the present invention] FIG. 1. Permanent magnet, 2, 2' yoke, 3...
・ ・Ar/Chicoa, 4. ・Plate spring, 5. Printing pin, 6. Temporary spring installation stand, 7. Demagnetizing coil, 8. Bypass yoke, 9.・Kune Shrine, 10...Shuki Key 9・Nofu" 0th name of J Hito Patent attorney Toshio Nakao and 1 other person Figure 1 2' Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] (1) A bypass yoke is attached via a spring to the side of a magnetic circuit constructed using permanent magnets, and when a printing signal is sent to a degaussing coil wound around the outer circumference of the yoke of the magnetic circuit, the permanent The magnetic field of the magnet is canceled, and the canceled magnetic flux causes the bypass yoke to be attracted to the yokes on both end faces of the permanent magnet, and the armature provided between the two poles of the magnetic circuit is passed through a small demagnetizing current. So 4@
A print head for Dotan printers that is characterized by being movable.