JP2006159483A - Dot line printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To share the parts of a hammer mechanism section as much as possible, to constitute a new arrangement of a printing hammer, and to easily perform a series development in the hammer mechanism section of a dot line printer. <P>SOLUTION: The arrangement of printing elements to the comb yoke of a hammer bank is made a basic arrangement. A gap is provided in such a manner that M (M is an integer) pieces of combs of the comb yoke not being confronted with the printing elements may stay vacant between spring modules. Hammer modules of a quantity being smaller than the basic arrangement are arranged on the comb yoke. Also, a second printing element arrangement for which electromagnetic coils for releasing are eliminated regarding the combs of the comb yoke which are not confronted with the printing elements is provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a dot line printer, and more particularly to a hammer arrangement of hammer banks.

  The prior art will be described with reference to FIG. In the dot line printer printing method, a hammer mechanism portion 2 having a printing hammer (not shown) is reciprocated in the digit direction by a shuttle mechanism portion (not shown). In this process, the ink ribbon 3 and the printing paper 5 are sandwiched, the printing hammer 1 is driven with respect to the platen 4 holding the printing force, and the ink of the ink ribbon 3 is transferred to the printing paper 5 to print in the form of a dot matrix. Characters, graphics, and the like are printed while alternately repeating the operation and the paper feeding operation of driving the stepping motor 6 and feeding the printing paper through the tractor 7 in the vertical direction.

  Next, details of the hammer mechanism 2 will be described with reference to FIGS. 4 and 5. 4 is a perspective view of the hammer mechanism 2, and FIG. 5 is a cross-sectional view.

  A dot line printer is a printer that prints text and graphics by transferring ink onto paper with the force of a printing hammer. It can print on various types of paper with different thicknesses and multi-copy paper such as delivery slips. Have

  The driving principle of the printing hammer will be described with reference to the drawings. A printing pin 12 is attached to the tip of the leaf spring 11 by a closed magnetic circuit comprising a hammer base 26 comprising a magnet 21, a yoke base 22 and a comb yoke 23, and a front yoke for securing a magnetic path located in front of the printing hammer 1. The provided printing hammer 1 is attracted to bend, and the release electromagnetic coil 24 that cancels the magnetic field of the closed magnetic circuit is driven in a timely manner to release the bent printing hammer 1 to print dots.

  A plurality of the printing hammers 1 are arranged in the digit direction to constitute a hammer bank. In order to arrange a plurality of printing hammers, the comb yoke 23 has a comb shape, and each comb has a release electromagnetic coil. The printing hammer 1 is a hammer module in which a plurality of rows (12 rows in the figure) arranged at predetermined intervals in the digit direction and perpendicular to the digit direction are arranged as a hammer module, facing the comb yoke 23 without any gaps. ing. The comb of the com yoke 23 and the printing hammer 1 are opposed to each other.

  FIG. 3 shows a configuration in which twelve hammer modules having a 12-pin printing hammer 1 are arranged to have a 144-pin printing hammer in total. The number of combs of the comb yoke 23 is also 144 in the shape of facing the printing hammer 1, and 144 releasing coils are provided in each of them.

  A printing operation in a printing hammer arrangement in which 12 columns are arranged vertically with respect to the digit direction will be described. The hammer modules 25 are arranged in 12 columns in the vertical direction. The shuttle mechanism part swings more than the distance A shown in the figure by the shuttle mechanism to the position of the printing hammer 1 in the same row of adjacent hammer modules. By driving the printing hammer 1 in a timely manner, it is possible to connect the printed dot lines between the adjacent hammer modules 25 by a left-to-right (or right-to-left) operation (hereinafter referred to as one scan). As a result, 12 dot lines can be printed across 12 hammer modules at a time. Multiple rows can be printed in one scan, and the speed of the equipment can be increased.

  There is a demand for the development of a low-speed dot line printer in which the above-described hammer bank having a 12-column arrangement perpendicular to the digit direction is designed to share parts as much as possible, while reducing costs and development costs. Conventionally, it has been proposed to reduce the arrangement of 12 rows to 6 rows and the number of printing hammers to 72 pins (see, for example, Patent Document 1). According to this proposal, the main parts of the basic hammer mechanism can be shared, thereby shortening the development period of the newly developed hammer mechanism, and reducing its development, production equipment and parts costs. It is stated that

JP-A-9-85970

  In the technique shown in Patent Document 1, it is possible to achieve sharing of parts and shortening of the development period. However, considering the components that can be reduced, 72 printing pins are obtained by reducing 12 rows to 6 rows. The number of the 72 release coils can be reduced, but the number of the common components such as one yoke base, twelve front yokes and twelve leaf springs cannot be reduced. In particular, the fact that the number of front yokes and leaf springs, which occupy a large percentage of the cost structure, cannot be reduced, resulted in a problem that the cost could not be reduced even though the number of printing hammers was reduced. .

  The problem is that the arrangement of printing elements with respect to the comb yoke of the hammer bank is a basic arrangement, and there is a gap between the spring modules so that there are M (M is an integer) comb combs of the comb yoke that do not face the printing elements. The problem is solved by having a second printing element arrangement in which the number of hammer modules is arranged in the comb yoke and the release electromagnetic coil is removed from the comb of the comb yoke where the printing elements are not opposed.

  According to the present invention, when the number of printing hammers is reduced and a new arrangement of hammer mechanism portions is realized, the number of parts and the cost can be greatly reduced. In addition, parts can be shared, and the development period can be shortened, and the development cost and production equipment cost can be reduced.

  The purpose of reducing the number of parts and shortening the development period was realized by thinning out the hammer modules.

  An embodiment of the present invention will be described with reference to FIG.

  The basic array shown in FIG. 3 has a configuration in which 12 modules in the vertical direction are arranged as one module and 12 modules are arranged on a comb yoke. Comyoke has 144 combs. In contrast, in the present invention, as shown in FIG. 1, the comb yoke is arranged with a gap so that there are 12 unused comb portions between the hammer modules 25 based on the first digit (first comb). As a result, a hammer bank having a different configuration having 72 pins of a printing hammer can be formed. In this arrangement, the dot line printed between adjacent hammer modules 25 can be connected by extending the swing distance from the distance A in the 144-pin configuration to (2 × A). As a result, 12 dot lines can be printed on 12 hammer modules at a time. In addition, with respect to the comb of the comb yoke 23 that is not opposed to the printing hammer, it is possible to delete the discharge magnetic coil. In the present invention, when the number of parts is compared with the hammer bank having 72 print pins in the method of reducing the vertical arrangement in Patent Document 1, it is the same that 72 print pins and 72 release coils can be reduced. Further, six leaf springs and six front yokes can be reduced. Since the number of two parts having a large cost component ratio can be reduced, the cost of the hammer bank can be significantly reduced.

  Another embodiment of the present invention will be described with reference to FIG. In this embodiment, the first module is arranged based on the first digit, and four hammer modules are arranged at intervals so that there are 24 combs of the comb yoke 23 that are not used between the hammer modules. It is an example. By moving the shuttle swing distance from the basic array A to (3 × A), the dot lines of 12 columns can be printed in one scan as in the first embodiment.

It is a front view of the hammer mechanism part in the dot line printer of the present invention. Example 1 It is a front view of the hammer mechanism part in the dot line printer of the present invention. (Example 2) It is a front view of the hammer mechanism part in the conventional dot line printer. It is a perspective view of the hammer mechanism part in the conventional dot line printer. It is sectional drawing of the hammer mechanism part in the conventional dot line printer. It is a perspective view of the printing mechanism part in the conventional dot line printer.

Explanation of symbols

1 is a printing hammer, 2 is a hammer mechanism, 3 is an ink ribbon, 4 is a platen, 5 is printing paper, 6 is a stepping motor, 7 is a tractor, 11 is a yoke base, 12 is a printing pin, 21 is a magnet, 22 is A yoke base, 23 is a comb yoke, 24 is a release coil, 25 is a hammer module, and 26 is a hammer base.

Claims (1)

A plurality of (k) spring modules, each having a printing element for dot printing fixed at the tip of a leaf spring and arranged in a plurality of rows (N rows) at approximately equal intervals in the digit direction. Each of the comb-shaped yokes having a magnet for generating an attracting force and having (k × N) comb-shaped shapes at approximately equal intervals by holding and holding the leaf springs at the non-printing position. It consists of a release electromagnetic coil for releasing the suction state provided on the, and k spring modules are arranged on the basis of the first digit (1st comb) of the comb yoke, and the comb and the printing element of the spring module are opposed to each other. Is a hammer bank having the same number of printing elements as the number of combs (k × N), and releasing the printing elements that are attracted in the process of reciprocating the hammer bank in the digit direction. Electromagnetic In a printer that is released in the form of a dot matrix on a paper sheet via a ribbon, the arrangement of the printing elements with respect to the comb yoke of the hammer bank is a basic arrangement, and the comb of the comb yoke that does not oppose the printing element between the spring modules is M ( M is an integer) A second arrangement in which gaps are provided so as to be separated one by one, a smaller number of hammer modules than in the basic arrangement are provided in the comb yoke, and the release electromagnetic coil is deleted from the comb of the comb yoke that is not opposed to the printing element. A dot line printer characterized by having a printing element array.

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