JPS60109860A - Printing hammr of printer - Google Patents

Abstract

PURPOSE:To obtain a printing hammer capable of high-speed printing by a method in which a plate spring is made of magnetic high-tensile steel material, and armatures are used as magnetic circuits and the projection of the armatures are used to enhance the stiffness of plate spring. CONSTITUTION:Current is flowed in a coil 11, a magnetic field directed to opposite direction of the magnetic field of a permanent magnet 12 is held, and the permanent magnet is demagnetized. Whereupon, a hammer is collided with an ink ribbon, a printing paper, and a platen by the force of a flexed spring to print one dot. The hammer is restored to yokes 10 and 10' sides by repulsion caused by collision with the permanent magnet 12 by breaking the current of the coil 11 immediately before collision. In case where the stiffness of the tip of the hammer is short, the tip portion is flexed by the inertia of the armatures 9 during the collision with the platen, and response time is elongated. For this reason, the stiffness of the tip of the hammer is increased by the projection of the armatures 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which Ming belongs] This invention relates to a print hammer for a Qj1 impact dot type shuttle printer.

[Prior art and problems]

Conventionally, in this type of TJ-shaped hammer, a spring-charge type printing hammer has a spring l, as shown in Figure 1.
, a printing bin 2. This hammer and yoke 3. A hammer assembly is constructed by attaching a drive unit consisting of a coil 4, a coil 4, and a permanent magnet 5 to the pace 6. Here, a gap i (gap) is provided at one end of the hammer and the yoke before magnetization. By magnetizing the permanent magnet, magnetic flux flows through the hammer and drive unit as shown in the figure, and the hammer is attracted to the yoke against the force of the splash, and is in contact with one end of the yoke. is retained.

During printing, when the coil is energized, the magnetic field of the permanent magnet is canceled out, and the force of the hammered and deflected spring causes it to collide with an ink phone, printing paper, and platen (not shown), striking a single dot. engrave The hammer is
Immediately before the collision, the current in the coil is cut off, and the permanent magnet force and the repulsive force from the collision cause it to return to the yoke.

In a shuttle-type printer, a large number of hammers and q-drive units that perform this type of operation are lined up, and a single bead is swung perpendicular to the direction of hammer movement, timing is controlled and the hammers are driven to create dots in the lateral direction. It is recommended that you stamp the dots vertically using a piece of paper and then stamp the dots vertically.
form a lix and print any characters.

Therefore, in order to perform high-speed printing, it is necessary to increase the hammer response frequency.

It is necessary to downsize the hammer 7 and reduce the quality h1 of the hammer movable part. The length of the suction part is determined by 1 ^ between the two yokes, but if this interval is made smaller, the output magnetic flux force will increase even if the distance between the yokes is υ1, so the length of the suction part will be cannot be changed. Therefore, it is necessary to shorten the long culm of 4. However, in order to shorten the spring part (to obtain the same level of spring stiffness and deflection as before, the stress in the spring part is extremely large). For this reason, with conventional materials, it was difficult to shorten the spring portion due to stress.

Furthermore, in conventional hammers, the magnetic flux flows through the spring IS, so the attraction force required to attract the hammer against the spring force is 11
1 occurs.

As shown in Figure 2, a hammer with a structure in which an armature is connected to a spring material has been used.

1' indicates amateur.

However, the hammer shown in this figure has the disadvantage that the connection between the spring and the armature causes the length of the hammer to fluctuate, requiring great precision in machining, and increasing costs.

[Purpose of the invention]

It is an object of the present invention to provide a printing hammer for a printer that improves the drawbacks of the conventional printing hammer described above and is capable of high-speed printing.

[Summary of the invention]

According to the present invention, the hammer, which is composed of a printing bottle attached to one end of the plate spring and an armature having a protrusion at one end attached to the plate spring, is attracted and released. In a printing hammer assembly for a printer consisting of a permanent magnet, a coil, and a yoke, the leaf spring is made of magnetic material and high-tensile steel, the armature is used as a monument circuit, and the protrusion of the armature is used to increase the rigidity of the leaf spring. It is characterized by being used to enhance With this configuration, a compact printer with a high response frequency and a printer capable of high-speed printing can be obtained.

[Effect of the invention] As in the present invention, the spring material is magnetic and the armature is made of tension steel, the armature is attached to the spring, and the armature is
? SD? The printing hammer used for reinforcing the tip of the I-spring has the following advantages.

First, in order to perform high-speed printing, it is necessary to reduce the amount of paper and paper quality. For this reason, it was necessary to downsize the spring, and it was difficult to obtain the necessary deflection and spring stiffness with the length of the spring part. Therefore, by using high-strength steel, such as maraging steel, which has a stress about twice that of a conventional spring, the length of the spring can be shortened, the hammer can be made smaller, and its mass can be reduced.

Furthermore, by attaching an armature made of a material with good magnetization properties, such as silica steel, to the spring to form a magnetic path, saturation of the magnetic flux is less likely to occur and the attractive force can be used effectively. In addition, by stretching a part of the armature to reinforce the spring, the rigidity of the hammer tip can be increased, preventing the hammer tip from deflecting when it collides with the platen, and shortening the response time. can.

In addition, since the spring is used over the entire length of the hammer, variations in the hammer pin position can be suppressed.

As described above, according to the present invention, it is possible to provide a printing machine that performs high-speed printing.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 3 is a perspective view showing an embodiment of the printing nozzle according to the present invention.

In the figure, 7 is a plate made of maraging steel, an 8Fi printing pin, and a 9-piece armature. The printing bottle 8 is located at a mounting position drilled in the leaf spring 7.
It is soldered through the hole 14 for fitting. The armature 9 is brazed to the plate spring 8 as shown. Further, the tip of the protrusion of the armature 9 is also fitted onto the printing pin 8. Therefore, the rigidity of the tip of the hammer becomes sufficiently large. The fixed end of the plate spring 9 is connected to the holding plate 15.1.
6 and is attached to the base 13 with screws or the like. The yoke 10, 1.0 is attached to the pace 13 by being sandwiched between permanent magnets. Yoke 10.
One end of the armature 10' is not magnetized and faces the armature 9 with a certain gap in between. The coils ti and ii are fixed on the yoke with an adhesive or the like Q. A large number of the above-mentioned hammer assemblies are arranged and printed.

Next, the operation of the printing hammer of the present invention constructed as described above will be explained.

First, the hammer assembly f is constructed as shown in Fig. 3 (by applying magnetism to the permanent magnet, the magnetic flux in the armature part is not saturated), and the hammer is attached to the yoke side vc. maintained in the state.

At this time, a large stress is applied to the spring part.

Printing is done as follows. First, a current is applied to the coil, the magnetic field of the permanent magnet is combined with the magnetic field of the opposite grain, and the magnetic field of the permanent magnet is canceled out. , collides with the platelet, striking one dot. Before the hammer collides with iα, the current in the coil is cut off, and the permanent magnetic force and
Due to the repulsive force caused by the collision, it returns to the yoke side. If the rigidity of the tip of the hammer is insufficient, the tip will deflect due to the inertia of the armature when it collides with the platen, prolonging the response time. Therefore, the rigidity of the tip of the armature is increased by the protrusion of the armature part.

As described in detail above, according to the present invention, a printing hammer capable of high-speed printing can be provided.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing a conventional printing hammer assembly, FIG. 2 is a schematic side view showing a conventional improved printing hammer assembly, and FIG. 3 is a schematic side view showing a printing hammer assembly according to the present invention. It is a schematic perspective view showing an example. 7... Leaf spring 8... - Printing bottle 9... Amateur lO... Yoke 10'... Yoke 11...
Coil 11'...Coil 12...Permanent magnet agent Patent attorney Noriyuki Chika (and 1 other person) Figure 1 Figure 2 Figure 8

Claims (1)

[Claims] A hammer consisting of a printing pin attached to the protruding end of the leaf spring, and an amateur chair attached to the leaf spring and protruding from one end; a permanent magnet, a coil, and a yoke for attracting and detaching the hammer; In the printing hammer assembly for a printer, the leaf spring is made of a magnetic material and is made of a tension material, the armature is used as a magnetic circuit, and the protrusion of the armature is used to increase the rigidity of the leaf spring. A 1J-shaped hammer for a printer.