JPH09156135A - Dot line printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily develop a hammer mechanism to be newly developed, in a hammer mechanism part loaded with printing hammers continuously arranged in a figure direction at a predetermined interval in a plurality of rows, by decinating printing hammers of a plurality of rows and making the leaf springs constituting the printing hammers relatively thick. SOLUTION: A hammer mechanism part is equipped with printing hammers 80 constituted by providing printing pins 12 to one ends of a plurality of leaf springs 70 and the printing hammers 80 are attached to a yoke 16 on a magnetic circuit formed from a comb yoke 17, a magnet 15 and the yoke 16 on the other end side of the leaf springs 70 by screws 14. The hammer mechanism part becoming fundamental is loaded with a large number of the printing hammers arranged in a figure direction at an almost equal interval P in twelve rows and the printing hammers (1-3 rows and 10-12 rows) at both ends are decimated so as to become six rows in the figure direction at a predetermined interval P. The thickness of the leaf springs 70 of the printing hammers 80 is made larger than that of the printing hammer becoming fundamental.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dot line printer for reciprocating a printing means having a plurality of dot printing elements at predetermined intervals in the digit direction and reciprocating in the digit direction, and printing during the reciprocating movement. Is.

[0002]

2. Description of the Related Art The contents of the prior art will be described by taking the dot line printers shown in FIGS. 3, 4 and 5 as an example.

FIG. 3 is a plan view of the main printing mechanism of the dot line printer, FIG. 4 is a side view of the main printing mechanism of the dot line printer, and FIG. 5 is a front view of the main printing mechanism of the dot line printer. It is a thing.

In the drawing, a printing hammer 60 having a printing pin 12 provided at the tip of a leaf spring 11 is arranged in a plurality of rows (N ₁ = 12) at predetermined intervals in the digit direction. The hammer mechanism unit 10 is equipped with a large number of units. The hammer mechanism section 10 is connected at one end to a shuttle mechanism section 20 which is a reciprocating mechanism composed of a cam mechanism or a linear motor.

The ink ribbon 31 is arranged so as to pass through the front surface of the hammer mechanism portion 10 by ribbon guides 34 provided on both sides of the hammer mechanism portion 10 and the shuttle mechanism portion 20. The ink ribbon 31 is driven by a pair of ribbon rollers 32 via a ribbon sensor 33 and is regularly stored in a ribbon cassette 30. The ink ribbon 31 stored in the ribbon cassette 30 is ejected from the other end of the ribbon cassette 30, and then the ribbon guide 3
It runs on the front surface of the hammer mechanism 10 via 4 and repeats the running until the end of its life.

The platen 40 supports the printing force of the printing hammer 60.

The printing paper 50 is intermittently fed on a path that comes into contact with the surface of the platen 40.

The printing hammer 60 is composed of a leaf spring 11 and a printing pin 12 provided at one end of the leaf spring 11 (on the free end side). The printing hammer 60 is joined at the base of each leaf spring 11 to form an integrated module structure. The other end (fixed end side) of the leaf spring 11, that is, the root side is provided with a screw 14 on the magnetic circuit formed by the comb yoke 17, the magnet 15 and the yoke 16.
It is attached to the yoke 16 via.

In the above construction, the free end side of the printing hammer 60 is magnetically attracted and bent by the comb yoke 17 during non-printing. At the time of printing, a pulse current (release current) is applied to the hammer coil 13 provided in the comb yoke 17 from a drive circuit (not shown) to release the print hammer 60 from the magnetic attraction force and perform dot printing.

The printing speed and copying ability of a dot line printer are mainly the dot printing speed and printing power of a printing hammer.
It depends on the number of mounted devices and the number of arrays in the vertical direction. The number of arrays means the number of dot lines that can be printed at the same time in one movement process of reciprocating movement. As this number increases, the number of paper feeds when printing one line decreases, which contributes to the speedup of the dot line printer. To do.

[0011]

As described above, the performance of the dot line printer is mainly expressed by the printing speed and the copying ability.

In developing a new dot line printer, the number of printing hammers mounted and the number of vertical arrangements thereof have been examined in order to satisfy the target performance, and new components have been developed. In combination, we have developed a hammer mechanism. Therefore, enormous development cost, time and man-hours, die cost, production facility cost, etc. are required for each development.

According to the present invention, in order to reduce enormous development costs, time and man-hours, mold costs, production facility costs, etc., the columns are arranged at predetermined intervals in a column direction and continuously arranged in a plurality of rows (N ₁ ). It is an object of the present invention to provide a new reliable and inexpensive dot line printer by using a hammer mechanism section equipped with a printed printing hammer as a basic hammer mechanism section and diverting its components as much as possible to develop.

[0014]

SUMMARY OF THE INVENTION The above-mentioned problems are solved by a hammer equipped with a printing means A, which is a basic printing means equipped with printing hammers arranged at a predetermined interval in the column direction and continuously in a plurality of (N ₁ ) rows. in mechanism, among the printing hammer which is composed of a plurality of rows (N ₁₎ (N ₂₎ and column thinning (N ₁₎ the number of sequences which was a column (N ₁ -N ₂₎ the sequence number of columns And the printing means A based on the plate thickness t ₂ of the plate spring constituting the printing hammer.
This is achieved by making the plate spring thicker than the plate thickness t ₁ of the plate spring to form a new printing unit B, and mounting the new printing unit B to form a new hammer mechanism section.

With the above-mentioned structure, the magnetic flux from the permanent magnets wrapping around the printing hammer in the (N ₁ ) row is left in the hammer mechanism portion equipped with the basic printing means A (N ₁ ). _Since the magnetic flux wraps around only to the _1- N ₂ ) printing hammer, the force of attracting the leaf spring becomes strong, which makes it possible to use the leaf spring having the thickness t ₂ > the thickness t ₁ .
The natural frequency of the printing hammer can be increased.

Further, the other components of the parts related to the printing hammer can be made common by diverting the parts of the basic hammer mechanism section.

[0017]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a front view of a hammer mechanism portion showing an example of the present invention. FIG. 2 is a side view of the hammer mechanism portion showing an embodiment of the present invention.

The printing hammer 80 constituted by the leaf spring 70 and the print pin 12 provided at one end (free end side) of the leaf spring 70 has the other end (fixed end side) of the leaf spring 70, that is, the root side. Is attached to the yoke 16 via the screw 14 on the magnetic circuit formed by the comb yoke 17, the magnet 15 and the yoke 16.

In the above structure, when the printing is not performed, the free end side of the printing hammer 80 is magnetically attracted and bent by the comb yoke 17. At the time of printing, a pulse current (release current) is applied to the hammer coil 13 arranged in the comb yoke 17 from a drive circuit (not shown) to release the print hammer 80 from the magnetic attraction force and perform dot printing.

As shown in FIG. 5, the print hammer 80 shown in FIG. 1 has a substantially predetermined interval P in the digit direction and N ₁ = 12.
As a basic hammer mechanism section, which mounts a large number of printing hammers for dot printing arranged in rows, the both ends of 12 rows are arranged at a predetermined interval P in the digit direction and N ₁ -N ₂ = 6 rows. The printing hammers (1 to 3 rows and 10 to 12 rows) are thinned out.

At this time, the plate thickness t ₂ of the plate spring 70 constituting the printing hammer 80 is the plate spring 11 of the basic hammer mechanism.
Is thicker than the plate thickness t ₁ .

The spacing P in the digit direction in this example is about 0.1 inch, and the total number of the printing pins 12 of the basic hammer mechanism is 144 pins.

The total number of printing pins 12 in the embodiment shown in FIG. 1 is 72 pins. It is convenient to arrange the number of the printing pins 12 to be a divisor of the number of dots in the vertical direction of a character that is normally used.
It is selected from among 3, 4, 6, 8, and 12.

The plate thickness t ₂ of the plate spring 70 is determined by the magnetic circuit structure that constitutes the basic hammer mechanism, the number of the print pins 12 arranged, and the processing method and dimensional accuracy of the plate spring 70. To be

[0026]

As described above, according to the present invention, in the basic hammer mechanism portion equipped with the printing hammers arranged at a predetermined interval in the digit direction and continuously in a plurality of rows (N ₁ ) rows, Thinning out the printing hammer of the (N ₂ ) row (N ₁ -N ₂ ).
Since the number of rows is arranged and the plate thickness t ₂ of the leaf spring constituting the printing hammer is made thicker than the plate thickness t ₁ of the leaf hammer of the basic hammer mechanism section, Main parts can be shared. As a result, the newly developed hammer mechanism can be developed in a short period of time, and the development cost, production equipment cost, and parts cost can be significantly reduced.

Further, by increasing the thickness of the leaf spring, the natural frequency of the printing hammer can be increased, the followability of the printing hammer to the gap variation between the hammer mechanism and the platen can be improved, and the reliability of dot removal can be improved. Sex, multi-part paper,
The margin for the corrugated paper is improved.

[Brief description of the drawings]

FIG. 1 is a front view of a hammer mechanism portion showing an example of the present invention.

FIG. 2 is a side view of a hammer mechanism portion showing an example of the present invention.

FIG. 3 is a plan view of a printing mechanism unit showing a conventional example.

FIG. 4 is a side view of a hammer mechanism section showing a conventional example.

FIG. 5 is a front view of a hammer mechanism section showing a conventional example.

[Explanation of symbols]

Reference numeral 10 is a hammer mechanism portion, 11 and 70 are leaf springs, 12 is a printing pin, 13 is a releasing electromagnetic coil, 14 is a screw, 15 is a permanent magnet, 16 is a yoke, 17 is a comb yoke, and 20 is a shuttle mechanism. Part, 30 is a ribbon cassette, 31 is an ink ribbon, 32 is a ribbon roller, 33 is a ribbon sensor, 34 is a ribbon guide, 40 is a platen, 50 is printing paper, 60
Is a printing hammer.

Claims (1)

[Claims] 1. A printing hammer having a printing pin provided at the tip of a leaf spring having a thickness of t ₁ is provided in a plurality of rows (N
₁ ) A dot having a printing means A having printing elements for dot printing arranged in rows, a reciprocating means for connecting the printing means A to reciprocate in the digit direction, and a paper feeding means for feeding a printing paper. In a line printer, the arrangement of the printing elements in the printing means A is a basic arrangement, and printing elements for (N ₂ ) columns are thinned out from the printing means A having this basic arrangement together with leaf springs (N ₁ − N ₂ ) rows are arranged and a plate spring having a plate thickness t ₂ thicker than the plate thickness t ₁ of the plate spring of the printing unit A is attached to form a new printing unit B. Dot line printer characterized by being installed.