JP3503671B2 - Printing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing device generally called a dot line printer,
More specifically, based on the hammer mechanism section that has a printing pin developed mainly for Kanji printing, a hammer mechanism section with a higher printing power is formed mainly by a larger size printing pin for alphanumeric printing. It is about how to do it.

[0002]

2. Description of the Related Art A dot line printer is characterized in that characters and figures are printed in a dot matrix while reciprocatingly moving a hammer mechanism section in which printing hammers for dot printing are arranged at substantially equal intervals in the digit direction. Have.

This type of printer is a dot line printer for Chinese characters that mainly prints Chinese characters with a dot density of 160 to 180 dots / inch using a printing pin with a diameter of approximately 0.2 mm, and a dot line printer for Chinese characters of 0.3 to 0. 6 using a printing pin of about 4 mm
There are two types of alphanumeric dot line printers that mainly print alphanumeric characters with a dot density of 0 to 90 dots / inch. The printing power of the alphanumeric dot line printer is 1.5 compared to that for Kanji because the size of the printing pin is large.
Approximately twice the printing power is required. Dot printing is performed by a printing hammer provided with printing pins. Although there are various types of printing hammers, the mainstream method is the spring charge type that utilizes the bending energy of the leaf spring.

The printing hammer is one in which a printing pin is joined to one end of a hammer spring which is a leaf spring. This printing hammer is sucked by a hammer suction unit having a magnetic suction means and held at a non-printing position. The print hammer is driven by supplying a release current having a predetermined pulse width to a release electromagnetic coil (hereinafter simply referred to as an electromagnetic coil) arranged in a divided hammer suction portion corresponding to each print hammer.

The performance relating to the printing speed of the hammer mechanism is
It can be expressed by the number of printable dots per unit time.
The number of printable dots is the product of the repetitive operation characteristics of the print hammer and the number of mountings. Therefore, in order to improve the performance, it is necessary to increase the repeated operation characteristics of the print hammer and the number of mountings.

In order to improve the repetitive operation characteristics of the print hammer, it is essential to increase the natural frequency of the print hammer and reduce the equivalent mass (mass converted to the print pin position). To increase the number of printing hammers to be mounted, downsizing in the mounting direction is essential. Realize these while satisfying various restrictions such as securing appropriate printing force, configuration of magnetic circuit that efficiently magnetically attracts individual printing hammers, and restriction of leaf spring stress of printing hammers, using well-balanced technology. I have to let them do it.

Although the above detailed description is omitted, in this type of printing apparatus, this development requires enormous number of personnel, period and cost.

The hammer mechanism designed for printing Chinese characters has an appropriate printing force for a dot size of about 0.2 mm in diameter as described above. Therefore, simply changing the size of the printing pin cannot be used as a hammer mechanism section for alphanumeric printing that requires a large printing force.

As described above, the development of the hammer mechanism section requires a high level of skill and enormous cost and a long period of time. As a result, either the hammer mechanism section for kanji or the alphanumeric character can be developed. On the other hand. Developing both requires double the cost and time or personnel. In addition, the hammer mechanism parts that can be developed separately are expensive because they have little commonality.

This problem can be solved by the following measures. That is, based on the hammer mechanism for printing Chinese characters, the printing pins of the printing hammer are changed to the size for alphanumeric printing, the width of the leaf spring of the printing hammer is expanded to m times, and the number of mountings is increased. Can be handled by setting 1 / n. It is appropriate that the value of m is approximately the ratio of the printing power for alphanumeric printing to that for kanji printing. The value of n is an integer close to the value of m. Generally, the value of m is 1.5 to 2, so the value of n is 2. Since the width dimension of the printing hammer of the alphanumeric printing hammer mechanism portion configured as described above is widened, the printing power is increased almost in proportion to the spread ratio m. The suction to the non-printing position for applying the printing energy to the printing hammer is performed by the divided hammer suction part n of the magnetic suction means.
There is no problem because you can use individual pieces and obtain sufficient suction force.

Also, since the magnetic attraction means can be used in common with the Chinese character printing hammer mechanism, it can be manufactured at low cost.

[0012]

An electromagnetic coil is provided in each of the hammer suction portions. Therefore, it is still expensive because a plurality of n electromagnetic coils are used for each alphanumeric printing hammer. Furthermore, since the electromagnetic coil does not have an appropriate winding specification corresponding to the characteristics of the printing hammer for alphanumeric printing, the performance and driving efficiency of the printing hammer are not good.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to make an efficient and excellent performance hammering mechanism for alphanumeric characters at low cost.

[0014]

The above object can be realized by disposing a dedicated electromagnetic coil corresponding to a printing hammer for alphanumeric printing in a one-to-one correspondence.

Since the electromagnetic coil for alphanumeric printing configured as described above can be determined to have the optimum winding specifications, the performance of the printing hammer can be maximized and the number of electromagnetic coils can be minimized. It can be manufactured at low cost.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the drawings.

First, a printing method of this type of printing apparatus will be described with reference to FIGS. 7 and 8 showing a plan view and a sectional view of the printing mechanism section.

The hammer mechanism 10 having the print hammers 11 for dot printing mounted at substantially equal intervals in the digit direction is connected to the shuttle mechanism 20 and reciprocates in the direction of the arrow in the figure. The tape-shaped ink ribbon 31 running on the front surface of the hammer mechanism unit 10 comes out from one end of the ribbon cassette 30, is wound around a pair of ribbon rollers 32 via a ribbon guide 34 and a ribbon sensor 33, and is stored in the ribbon cassette 30. To be done.

The platen 40, which supports the printing force of the printing hammer 11, is arranged at a predetermined gap so as to face the hammer mechanism section 10 with the printing paper 50 and the ink ribbon 31 interposed therebetween.

The hammer mechanism 10 used here is generally called a spring charge type as shown in FIG. The leaf spring having the print pin 12 for dot printing joined to the tip is the print hammer 11. Printing hammer 11
Is a comb yoke 17 and a magnet 1 which are a hammer suction portion.
5 and the magnetic circuit formed by the yoke 16 are attached to the yoke 16 with screws 14. In this state, the printing hammer 11 is magnetically attracted by the comb yoke 17 and is bent, and has printing energy. The electromagnetic coil 13 is arranged in the comb yoke 17, and a drive circuit (not shown) causes a pulse current to flow in a direction in which the magnetic attraction force of the print hammer 11 is canceled to drive the print hammer 11 to perform dot printing.

In the hammer mechanism portion 10 developed for kanji printing, the spacing between the printing hammers 11, that is, the spacing p between the printing pins 12 is about 0.1 inch in this example. Since the printing range is generally 13.6 inches, the total number of the printing pins 12 corresponding thereto is substantially 136 pins.

Next, the hammer mechanism section 11 for printing the kanji character
Will be described with reference to FIG. 5 which is a front view seen from the platen 40 side and FIG. 6 which is a plan view. The printing hammer 11 has a width w ₂ at the lower end and a width w ₁ at the upper end, and has a substantially rectangular shape, but the width at the upper end side is slightly narrow. This printing hammer 11
Are attached to the yoke 16 with screws 14 at intervals p in the beam direction. The comb yoke 17 is divided in a comb shape so as to face each of the printing hammers 11, and the electromagnetic coil 13 is arranged in each comb portion. The size d of the printing pin 12 arranged at the tip of the printing hammer 11 is 0.2 mm in diameter.

A printing hammer 11a is developed for alphanumeric printing based on the hammer mechanism section 10 developed for printing Chinese characters described above. Hereinafter, description will be given with reference to FIGS. 3 and 4.

The printing power of the printing hammer 11a for printing alphanumeric characters is about twice as high as that for printing Chinese characters. In order to obtain this double printing power, the widths W ₁ and W ₂ of the printing hammer 11a are set to approximately double values in this example. Therefore, one printing hammer 11a is attached to the comb yoke 1
The two comb portions 7 are used for suction. The size D of the print pin 12a is about 0.35 mm in diameter.
The mounting interval of the printing hammer 11a is 2p, which is about 0.2 inch. Therefore, the number of printing hammers 11a is 136 /
2 = 68 pins. The configuration other than the above is almost the same as the hammer mechanism unit 10 for printing Chinese characters. As can be seen from this content, the hammer mechanism unit 10a for alphanumeric printing has a part having different specifications as compared with the hammer mechanism unit 10 for printing Chinese characters, and the part can be determined by a substantially proportional design. Therefore, it is possible to develop much more easily than the method developed from scratch.

In the above-mentioned configuration, the width of the printing hammer 11a is doubled so that the printing power is doubled as compared with that for the printing of Chinese characters. Therefore, the number of printing hammers is halved. It is a thing. When it is desired to increase the printing power by m times, the width of the printing hammer can be increased by m times, and the comb yokes 17 of the comb yoke 17 can attract the printing power. For the value of n, an integer close to m is selected.

In the examples shown in FIGS. 3 and 4, the print hammer 11 is provided with two electromagnetic coils 13 each. On the other hand, in the hammer mechanism section shown in FIGS. 1 and 2, one electromagnetic coil 13a is arranged for each printing hammer 11a. By doing so, the number of electromagnetic coils can be minimized and the number of drive circuits (not shown) can be reduced. Furthermore, since the winding specifications of the electromagnetic coil 13a can be determined according to the optimum specifications for the printing hammer 11a having a different specification,
The performance of a can be maximized.

[0027]

As described in detail above, according to the present invention, it is possible to enhance the characteristics of the printing hammer of the hammer mechanism portion for alphanumeric character printing developed based on the hammer mechanism portion developed for kanji character printing. At the same time, the cost of the electromagnetic coil unit and the drive circuit for the element can be reduced.

[Brief description of drawings]

FIG. 1 is a front view of a printing hammer for alphanumeric printing according to the present invention.

FIG. 2 is a plan view of a printing hammer for alphanumeric printing according to the present invention.

FIG. 3 is a front view of a printing hammer for alphanumeric printing.

FIG. 4 is a plan view of a printing hammer for alphanumeric printing.

FIG. 5 is a front view of a printing hammer for printing Chinese characters.

FIG. 6 is a plan view of a printing hammer for printing Chinese characters.

FIG. 7 is a plan view of a printing mechanism section.

FIG. 8 is a sectional view of a printing mechanism section.

[Explanation of symbols]

In the figure, 10a is a hammer mechanism, 11a is a printing hammer, 12a is a printing pin, 13a is an electromagnetic coil, and 17 is a comb yoke.

Claims (2)

(57) [Claims] 1. A printing pin for dot size d printing is arranged in a digit direction.
Marks corresponding to N print hammers arranged at approximately equal intervals p on the
Printing hammer suction unit divided into N to add letter energy
And N pieces to be wound around each of the printing hammer suction parts.
With a magnetic attraction means capable of disposing the electromagnetic coil of
Connecting the hammer mechanism to the hammer mechanism and reciprocating in the girder direction.
Reciprocating moving means for moving and paper feeding means for feeding printing paper
A printing device having a print head of the hammer mechanism section.
Mark the dot size D ( D> d ) by using multiple comma suction units.
Adjacent n print hammers for letters (however, n is 2 or more)
(An integer)
N / n are arranged at substantially equal intervals n × p in the direction, and
N print hammer suction parts with which the character hammer suction part abuts
Hammer mechanism formed by winding a single electromagnetic coil against
A printing device characterized by being formed. 2. The printer according to claim 1, wherein the value of n is 2.