JP2002059572A - Printing head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing head which can surely prevent armatures from rebounding by suppressing effects of concurrently printing armatures. SOLUTION: In the printing head, there are stacked and incorporated a plurality of armatures 4, an armature guide 2 for guiding the plurality of armatures 4, a stopper 7 having a plurality of butting parts 7a extended into the shape of a tongue corresponding to a plurality of armatures 4 not printing concurrently while adjacent butting parts are made separate and independent, a plurality of rigid bodies 8 individually corresponding to the butting parts 7a, and a plurality of elastic bodies 9 individually corresponding to the butting parts, which are locked to a yoke 1 by a clamp 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing head of a printing apparatus for printing characters and the like on a printing medium by using an armature wire driven electromagnetically.

[0002]

2. Description of the Related Art In recent years, in an impact type printing apparatus such as a line printer and a wire dot printer, a higher printing speed has been required. In this type of printing device, the armature is generally sucked by a print magnet, and members such as print wires involved in the printing operation are driven by the suction operation of the armature to the print magnet to print desired characters on a print medium. It is configured to be.

FIG. 5 is a configuration diagram of a conventional print head. FIG. 6 is a shape diagram of a stopper of a conventional print head. FIG. 7 is a front view of a tip guide of a conventional print head. FIG. 8A is a graph showing the operation (displacement) at the time of a return collision of the armature and the stopper when printing is performed by each conventional wire alone. FIG. 8 (b)
9 is a graph showing the operation (displacement) of the armature and the stopper at the time of a return collision when a conventional wire performs simultaneous printing.

In FIG. 5, 1 is a yoke, 2 is an armature guide for guiding the armature 4, 3 is a printing wire brazed to the end of the armature 4, 15 is a predetermined position of the armature 4 which has returned from the printing position to the standby position. This is a stopper that stops (restricts) the operation. Reference numeral 16 denotes a rigid body for reducing the impact of the stopper 15 when the armature 4 collides, and has a constant mass equal to or greater than the armature 4. Reference numeral 17 denotes an elastic member (sponge, rubber) for pressing the rigid body 16 against the stopper 15, and reference numeral 19 denotes a cover for pressing the elastic member 17 and the rigid body 16 to the stopper 15. 21 is the cover 19
Is a clamp that clamps the elastic member 17, the rigid body 16, the stopper 15, the armature guide 2 and the like to the yoke 1 via the. Reference numeral 6 denotes an armature which is inserted into a hole provided in the armature guide 2 and has a one-to-one correspondence with the armature 4.
Is a spring that presses in the direction facing the suction force of the core 1a. Reference numeral 13 denotes a nose having the distal end guide 5 and locked to the yoke 1.

[0005] The operation of the conventional print head thus configured will be described. When the print head performs printing, an electromagnetic force is generated in the core 1a by energizing the coil 22 wound on the core 1a of the yoke 1 facing the armature 4 corresponding to the required printing wire 3 based on the print data. The armature 4 is sucked, the printing wire 3 projects from the head tip guide 5 by a predetermined length, and prints one dot by hitting the printing paper via an ink ribbon (not shown).

In this manner, by hitting a plurality of printing wires at the same time, a vertical line of one character is visualized. By performing a printing operation while moving the print head in the print line direction, characters and the like are printed. In this printing, the guide holes are arranged as shown in FIG. 7 in order to minimize the simultaneous printing of the printing wire 3 and to perform dispersed printing. In addition, the hole pitch is set to 1/144 inch. Thereby, 1/60 which is the printing pitch of the dot printer,
When printing at any pitch of 1/90, 1/120, 1/180, and 1/240 inch, the set of wires to be printed simultaneously is L1-L9, L2-L8, L3-L7, L4-L.
6, R1-R9, R2-R8, R3-R7, R4-R6
It is only. Now, returning to the operation of the printing wire 3, the printing wire 3 that has finished hitting the printing paper is de-energized to the core 1 a and has no suction by the core 1 a. The armature 4 rotates about the fulcrum 1c of the yoke 1 as a fulcrum, thereby returning to a return operation.

At the time of return, the end of the armature 4 on the side where the printing wire 3 is not brazed collides with the stopper 15 and attenuates. The armature rebound amplitude h1 and the stopper collision surface amplitude t1 when printing is performed by each wire alone show displacements as shown in FIG. 8A with the passage of time. Further, in the case of simultaneous printing, the rebound amplitude h2 of the armature and the amplitude t2 of the stopper collision surface show displacement as shown in FIG. 8B with the passage of time.

[0008]

However, conventionally, the stopper 15, the rigid body 16, and the elastic body 17 are not divided corresponding to the armatures 4 for simultaneous printing, and are not integral with each other. When printing is performed at the same time, the amplitude t2 of the stopper collision surface increases, which adversely affects the rebound of the armature to be printed thereafter, and the rebound amplitude h2 increases as shown in FIG. In addition to the rapid transition to the operation standby state, high-speed printing cannot be performed, and sometimes the armature 4 rebounds to cause the printing wire 3 to protrude to the operating position, resulting in erroneous printing. In addition, since the stopper 15 is of an integral type and is almost fixed, there is a problem that it is difficult to control to reduce the rebound amplitude h2 of the armature 4 after colliding with the stopper 15.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and solves the above-mentioned deficiencies in the prior art to minimize the influence of an adjacent armature and to reliably prevent the rebound of the armature. It is intended to provide.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method of printing by hitting a printing wire with a plurality of electromagnetically driven armatures on printing paper.
A print head for a wire dot printer that performs distributed printing while minimizing the simultaneous printing of the printing wires when the printing wires form dots.It has a stopper that contacts the armature and regulates movement when the armature returns after printing. Then, the part where the armature of the stopper collides is divided so that the armatures that print at the same timing in the armature do not share with each other, so that they can operate independently for each set of multiple armatures that do not print at the same time. is there.

With this configuration, it is possible to obtain a print head capable of minimizing the influence of the adjacent armature and reliably preventing the rebound of the armature.

[0012]

DETAILED DESCRIPTION OF THE INVENTION According to the first aspect of the present invention, when a printing wire is hit by a plurality of electromagnetically driven armatures on a printing paper to perform printing, and when the printing wire forms dots, the printing wire is used. A print head for a wire dot printer that performs distributed printing while avoiding simultaneous printing as much as possible, and has a stopper that contacts the armature and restricts movement when the armature returns after printing, and the armature of the stopper collides with the armature. Are divided so that armatures that perform printing at the same timing do not share each other, and can operate independently for each set of a plurality of armatures that do not print at the same time.

According to a second aspect of the present invention, in the first aspect of the present invention, the contact portion of the stopper with the armature is
It is characterized in that it is formed in a shape similar to a plurality of corresponding armatures and in a tongue shape toward the inside and divided.

According to a third aspect of the present invention, in the second aspect of the present invention, a rigid body having a specific mass corresponding to each armature set is disposed on a side of the stopper opposite to the side on which the armature collides, and the rigid body is provided. The mass of the rigid body, the spring constant of the elastic member, and the spring coefficient of the armature, the stopper, and the rigid body are set so that the elastic member has a corresponding elastic member pressed against the stopper and the rebound amplitude of the armature after colliding with the stopper can be reduced. Things.

According to a fourth aspect of the present invention, there is provided a print head according to the third aspect, wherein the elastic member is a coil spring.

With the above configuration, the influence of the armature for simultaneous printing can be suppressed, the rebound amplitude of the armature can be reduced, high-speed printing can be performed, and printing quality can be improved.

Hereinafter, embodiments of the present invention will be described. FIG. 1 is a configuration diagram of a print head according to one embodiment of the present invention, FIG. 2 is a shape diagram of a stopper according to one embodiment of the present invention, and FIG. 3 is a part of a print head according to one embodiment of the present invention. FIG. 4 is a cross-sectional view, and FIG. 4 is a graph showing the operation (displacement) of the armature and the stopper according to the embodiment of the present invention, where the armature and the stopper return when the wires R3-R7 and R4-R6 perform simultaneous printing. It is a graph showing time operation (displacement). Here, the same components as those of the related art are denoted by the same reference numerals, and description thereof will be omitted.

In FIGS. 1 and 3, reference numeral 7 denotes a stopper having a tongue-shaped extending abutment portion 7a corresponding to two or more armatures 4 which do not perform simultaneous printing. The contact portion 7a is separated and independent from the adjacent tongue-like contact portion 7a by a slit (see contact portions indicated by reference numerals 7a-1 to 7a-9 in FIG. 2). Reference numeral 8 denotes a plurality of rigid bodies having a specific mass, which individually correspond to the collision surfaces of the respective contact portions 7a of the stopper 7 and have a similar shape to the contact portions 7a. Reference numeral 9 denotes a plurality of elastic bodies individually corresponding to the respective rigid bodies 8, preferably using springs. Reference numeral 10 denotes a cover disposed on the elastic body 9 side, which covers the elastic body 9 so as to be positioned on the stopper 7 side.

The rigid body 8 is positioned by a stopper 7. Reference numeral 21 denotes a clamp for clamping the elastic body 9, the rigid body 8, the stopper 7, the armature guide 2 and the like to the yoke 1 via the cover 10. The yoke 1 has a substantially circular shape, an opening in the center, and a plurality of armatures 4 that lock (braze) the print wires 3 and are attracted by electromagnetic force generated by energizing a coil 22 wound therearound. The core 1b and a plurality of members 1c that support the driving fulcrum of the armature 4 are integrally formed. The end surfaces (1a, 1b, 1c) of the yoke 1 on the side where the armature 4 is sucked are simultaneously polished on the same plane.

As shown in FIG. 1, a plurality of armatures 4, an armature guide 2 for guiding the plurality of armatures 4, a plurality of which do not perform simultaneous printing, a plurality of armatures individually corresponding to the two armatures 4 here. Here, a stopper 7 having nine contact portions 7a and a rigid body 8 having a plurality of masses individually corresponding to each contact portion 7a of the stopper 7
And a plurality of elastic bodies 9 individually corresponding to the respective rigid bodies 8, here, springs are laminated and incorporated, and the nose 13, the stopper 7, and the cover 10 locked to the yoke 1 are integrally formed by the clamp 21. It is assembled as a print head.

Next, the operation of the print head thus assembled will be described. In normal times, the armature 4 is held at a position away from the core 1b with the member 1c of the yoke 1 as a fulcrum by the repulsive force of the spring 6, as shown in FIG. Here, when the print head starts the printing operation based on the print data, the target print wire 3 is driven to drive the target (printing) print wire 3.
Core 1 facing armature 4 to which is attached
By passing a current through the coil 22 wound around the coil b, a magnetic force is generated between the core 1b and the armature 4, and the armature 4 is attracted toward the core 1b against the repulsive force of the spring 6. As a result, the printing wire 3 locked to the armature 4 protrudes from the head tip guide 5 and prints one dot by hitting the printing paper via an ink ribbon (not shown).

In the return operation after the printing operation, the armature 4 collides with the contact portion 7a of the stopper 7 by the reaction force of the impact and the return force of the spring 6. At this time, the contact portion 7a of the stopper 7 individually corresponds to a plurality of two armatures 4 which do not print at the same time, here the two armatures 4, and is sandwiched between the armature guide 2 and the rigid body 8 having a specific mass. Here, since it is pressed against the yoke 1 by a spring), it can freely move in the direction of the elastic body 9.

Here, as shown in FIG. 4, each of the constituent members reduces the rebound coefficient H of the armature 4, the stopper 7, and the rigid body 8 and the mass of the rigid body 8 so as to minimize the rebound amplitude H when the armature 4 returns. The spring constant of the elastic body 9 is set. Further, since a plurality of armatures 4 which are not simultaneously printed are individually supported here, it is possible to avoid adverse effects on the armature other than rebound due to simultaneous printing. As a result, the rebound amplitude H after the return of the armature 4 can be reduced, the armature 4 can be quickly shifted to the next operation standby state, high-speed printing can be performed, and the print quality can be improved.

[0024]

As described above, according to the present invention, when the armature is returned after printing, the armature has a stopper that abuts on the armature and regulates the movement, and a portion where the armature of the stopper collides with the armature at the same timing. The armature that performs printing is divided so that it does not share with each other, and it is possible to operate independently for multiple armature sets that do not print at the same time, thereby suppressing the effect of the armature that performs simultaneous printing and reliably preventing rebound of the armature it can.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a print head according to an embodiment of the present invention.

FIG. 2 is a shape diagram of a stopper according to the embodiment of the present invention.

FIG. 3 is a partial cross-sectional view of a print head according to an embodiment of the present invention.

FIG. 4 is a graph showing the operation (displacement) of an armature and a stopper according to an embodiment of the present invention.

FIG. 5 is a configuration diagram of a conventional print head.

FIG. 6 is a diagram showing a shape of a conventional print head stopper.

FIG. 7 is a front view of a tip guide of a conventional print head.

FIG. 8A is a graph showing the operation (displacement) of a return collision of an armature and a stopper when printing is performed using conventional wires alone; and FIG. 8B is a diagram illustrating the return of an armature and a stopper when printing is performed simultaneously using conventional wires. Graph showing motion (displacement) at the time of collision

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Yoke 2 Armature guide 3 Print wire 4 Armature 7 Stopper 8 Rigid body 9 Elastic body

Claims (4)

[Claims] The printing is performed by hitting a printing wire on a printing paper with a plurality of armatures driven electromagnetically.
A print head for a wire dot printer that performs distributed printing while avoiding simultaneous printing of the printing wire as much as possible when the printing wire forms dots, and contacts the armature when the armature returns after printing to regulate movement. The armature that collides with the armature is divided so that the armatures that perform printing at the same timing in the armature do not share each other, and each of the plurality of armature sets that do not print at the same time is separately provided. A print head characterized in that the print head can be operated with a. 2. The print head according to claim 1, wherein a contact portion of the stopper with the armature is formed in a shape similar to a corresponding plurality of armatures and in a tongue shape toward the inside and divided. . 3. An elastic member for disposing a rigid body having a specific mass corresponding to each armature set on the opposite side of the stopper from the side on which the armature collides, and pressing the rigid body against the corresponding stopper. In order to reduce the rebound amplitude of the armature after colliding with the stopper,
3. The print head according to claim 2, wherein a mass of the rigid body, a spring constant of the elastic member, and a rebound coefficient of the armature, the stopper, and the rigid body are set. 4. The print head according to claim 3, wherein said elastic member is a coil spring.