JPS6044356A - Printing head for dot printer - Google Patents

Abstract

PURPOSE:To increase suction force as well as speed up printing operation by a method in which the variation in the length of gap with changing the length of stroke is lessened by shaping the tips of an armature and a yoke into a squarish conical form in such a way as to increase the area facing the gap. CONSTITUTION:The shape of suction faces of a yoke 10 and an armature 11 is made into a squarish conical form in such a way that the length (e) of gap in a magnetic circuit is made smaller than the length (b) of stroke. Since the armature 11 can face the yoke 10 at 4-face, also, suction force can be effectively obtained. A plate spring 12 for driving a printing pin 7 is attached to the upside of the armature 11 to use it as a magnetic path, area facing the gap can also be further increased, and excellent suction force characteristics can be obtained. The weight of the drive system can be reduced and high-speed, highly accurate printing can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a print head for a dot-type wire printer, and is capable of printing characters such as Kanji characters at high speed and with high precision, especially by using a large number of arranged printing wires. The present invention relates to a print head for a dot printer as described above.

Conventional structure and its problems In recent years, advances in computers and peripheral technology have led to advances in information processing by computers, and in the field of office automation, there is a need for kanji information processing that takes advantage of the characteristics of Japanese that are easy to read and understand. is increasing year by year. Along with this, the development of various printers is progressing, and among these printers, wire dot printers, which can print on various types of paper and are inexpensive, are rapidly developing.

Therefore, as a print head for dot printers, a print head for kanji printers using the dot method, in which multiple printing wires and drive elements are arranged, has been developed, and measures such as higher speed, smaller size, and lower noise are desired. ing.

The printing gutter for conventional dot printers will be explained below.

1 and 2 are structural sectional views of two types of conventional dot printer print heads.

In FIG. 1, 1 is a permanent magnet, and yokes 2 are bonded to both end faces of the permanent magnet. 3 is an armature installed in the gap 4 of the magnetic circuit formed by the yoke 2. The armature 3 is attached to a plate spring mounting base 6 via a leaf spring 5, and a printing pin is attached to the other end of the armature 3.

8 is a degaussing coil wound around the outer periphery of the lower yoke 2'.

The operation of the conventional print gutter for a do/gutter printer shown in FIG. 1 constructed as described above will be explained below.

The armature 3 installed in the magnetic gear knob is normally 1
, are attracted to the lower yoke 2' by the magnetic field of the permanent magnet 1. Then, in response to the print signal, a current is applied to the degaussing coil 8 wound around the outer periphery of the lower yoke 2' in a direction that cancels out the magnetic field, so that the armature 3 is separated from the lower yoke 2' by the force of the leaf spring 5. Jump out in the direction. At the same time, the printing bottle 7, which has been picked up by the armature 3, pops out and prints by striking the ink ribbon and the paper. By cutting off the current flowing through the degaussing coil after printing, the printing pin 7 and armature 3 are attracted to the lower yoke 2' by the magnetic field of the permanent magnet 1.
This will restore the original state shown in FIG.

Next, in Fig. 2, yokes 2 are glued to both end faces of the permanent magnet 10, and the armature 3 is placed so as to face the two yokes, and a magnetic circuit is formed by this K. . The armature 3 is attached to a stand 6 via a leaf spring 6, and a printing pin 7 is attached to the other end of the armature 3. It is a degaussing coil wound around the outer periphery of the left and right yokes 2, measuring 8d.

The operation of the conventional dot blinking print head shown in FIG. 2 constructed as described above will be described below.

゛, Similar to the operating principle in the case of Fig. 1, Amachia ゛3
is normally attracted to the two yokes 2 by the magnetic field of the permanent magnet 1. Then, according to the print signal, the yoke 2
By passing a current through the degaussing coil 8 wound around the outer periphery of the armature in the direction of canceling the magnetic field, the armature 3 is separated from the yoke by the force of the leaf spring 5 and protrudes upward. At the same time, the printing pin 7 attached to the amage 73 pops out and printing can be performed. However, after printing, by cutting off the current flowing through the degaussing coil, the armature 3 is attracted by the magnetic field of the permanent magnet 1 and returns to its original state.

Below-1-1 I will explain the operating principle of the conventional dot print gutter shown in Figures 1 and 2.
In the case of the print head as shown in 1, the end faces of the armature 3 and the yoke 2 are perpendicular to the print bottle driving direction a (=
Furthermore, since both sides of the armature 3 and yoke 2 that form the magnetic circuit are flat, the attractive force that acts as a result of changes in the length of the shaft changes greatly, as shown in Fig. 5. It had some problems. In other words, since the stroke length = gear length, the magnetic circuit for the print head (・7
j5. In order to stabilize the operation accuracy, the range C in which the change in the attraction force is relatively small with respect to the change in stroke length is selected as the print head operation range1. However, in such a case, the magnetic The power of the 11th section of the circuit decreased, making it difficult to increase the printing speed.

OBJECTS OF THE INVENTION The present invention has been made to eliminate ten disadvantages of the prior art, and an object of the present invention is to provide a print head for a dot printer that can print at high speed and with high precision.

Structure of the Invention The present invention provides a printing pin, lij/
The yoke shape of the dynamic magnetic circuit is structured so that the magnetic gap consisting of two fields and an armature is located in the same linear direction as the direction in which the printing bottle drive leaf spring is attached.
In addition, the yoke shape of the armature suction surface is a concave shape with an inverted square elevation, and the armature has a square shape, and a square bottom part is attached to the printing pin and drive leaf spring. This makes it possible to increase the opposing area of the gap between the armature and the yoke, reduce the change in stroke length determined by the distance between the armature and the yoke, and also use the leaf spring for driving the printing pin 1 as a magnetic path. Since the excellent suction force characteristics can be reduced by 1υ, the present invention realizes a print head for a dot printer that can print characters at high speed and with high precision.

DESCRIPTION OF THE EMBODIMENTS The main parts of an embodiment of the present invention are shown in FIGS. 6 and 7. In this example, a printing pin made of 416 using a permanent magnet 9,
The shape of the yoke 10 of the driving magnetic circuit is divided into two yokes 10.
The magnetic gear knob, which is composed of a ', 10'' and an armature 11, is of a 1'14 construction in which the printing pin and drive leaf spring 12 are mounted in the same linear direction as the direction. The yoke shape of the armature suction surface is made into a concave shape of an inverted square pyramid, and the armature 11 is made into a convex shape of a square pyramid, contrary to the yoke 10. is installed.

Then, as shown in the figure, two yokes 10', 1
The outer periphery of the four parts of the inverted quadrangular pyramid formed by 0'' is configured so that the contact surface 13 of the magnetic poles is as small as possible in order to reduce leakage between the two magnetic poles.

Note that arrow d indicates the amateur insertion direction.

The operating principle of the print head magnetic circuit configured as described above is the same as that of the conventional type, but by making the suction surfaces of the yoke 10 and the armature 11 both square mA shapes, the armature 11 and the armature 11 are different. Compared to the stroke length caused by the distance from the yoke 10, the gap length e of the magnetic circuit can be made smaller (e-b On the other hand, it becomes possible to face each other on four sides, and therefore, even when the amateur is made smaller and lighter, it becomes possible to obtain suction force very efficiently.

Furthermore, there is a pinot printed on the upper surface of the armature 11, and a drive If
By attaching the leaf spring 12, it becomes possible to use the printing pin driving leaf spring as a magnetic path, and as a result, the gap facing area can be made much larger than the conventional one. As shown in Figure 8, the change in suction force can be made relatively small by changing the stroke length by χ・J, and the weight of the conventional drive system (amateur) can be made relatively small.

Approximately 100 weight (weight of plate pie, printing pin) - 1 drive system with suction force characteristics superior to conventional suction force characteristics g
stomach! ) or 1-j].

Effects of the Invention In the present invention, by making the end faces of the armature and the yoke into a square pyramid shape, it is possible to reduce the change in the gap length with respect to the change in the stroke length. The change in attraction force can be made relatively small, the opposing area of the gap between the armature and the yoke can be increased, and the printing pin and drive leaf spring can also be used as magnetic paths, making it possible to use In the case of reducing the weight of the print head (fC), it is possible to use one magnetic circle with a large attraction force within the print head 1 drive range.

Therefore, it is possible to simultaneously satisfy the two conditions necessary to increase the speed of print heads for dot printers, such as improving the suction force and reducing the weight of the drive system. According to the present invention, it is possible to provide a print head for a dot printer that can perform printing.

[Brief explanation of the drawing]

Figures 1 and 2 are structural sectional views of a single print head for a conventional dot splitter, and Figures 3 and 4 are sectional views of the structure of a single print head for a conventional dot splitter.
Fig. 5 is a characteristic diagram showing the relationship between loaf length and suction force of the conventional example, and Fig. 6 is a side view showing the print head (14 structure) of an embodiment of the present invention. Figure 7 is the 6th
FIG. 8, which is an enlarged view of j comb in the figure, is a characteristic diagram showing the relationship between the stroke length and suction force of this embodiment. 1...Permanent magnet, 2...Yoke, 3-
...-Amateur, 4...Magnetic gap, 6.
...Plate spring, 6...Plate spring installation is with stand, 7
... Printing bottle, 8 ... Degaussing coil, 9.
...Permanent magnet, 10...Yoke, 10/
, 1 o /7...Yoke end face, 11...
Amateur, 12...Plate spring, a...Print pin driving direction, b...stroke length, C...
...Print head drive range, d...Amateur insertion direction, e...Gap length, f...Conventional suction force characteristics, g...Suction force of the present invention! 1! I-sex. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2' Figure 2 Figure 3 Figure 4 Figure 5 Figure 2' Figure 2 Figure 3 Figure 4 Figure 5 Figure 2. Fig. zu Fro length (--) Fig. 7 11 No. 8 mouth stroke

Claims (1)

[Claims] The shape of the yoke of the magnetic circuit for driving the printing pin, which is constructed using a permanent magnet, is such that the magnetic gap consisting of two yokes and an armature is located in the same linear direction as the direction in which the leaf spring for driving the printing pin is attached. In addition, the yoke shape of the armature suction surface, which is composed of two poles, is a concave shape of an inverted circular pyramid, and the armature is a square pyramid shape, and a square bottom surface is attached to the printing bottle and drive leaf spring. Features of print head for dot printers.