JP3821188B2 - Dot line printer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dot line printer that reciprocates a hammer bank holding a plurality of spring-charged dot printing hammers arranged side by side in the row direction and prints the dot rows in the process of this reciprocation. This is related to the printing hammer.
[0002]
[Prior art]
An example of the prior art will be described with reference to FIGS.
[0003]
In FIG. 2, a printing hammer comprising a leaf spring 5 and a printing pin 6 attached to the tip of the leaf spring 5 is held at a non-printing position by, for example, a magnetic attraction force of a magnet 2 and is applied to a release electromagnetic coil 7 (hereinafter simply referred to as a coil). A spring charge type printing hammer which performs printing by releasing the printing hammer by supplying a release current having a predetermined pulse width. Further, in FIG. 2, a hammer bank in which a plurality of the printing hammers are integrated is configured in a double bank system in which two upper and lower stages are arranged.
[0004]
In such a double bank type dot line printer, when the coil 7 is cooled, the cooling air 9 is blown from the rear of the radiation fins 8 for cooling. At that time, the dust protector 10 is mounted in order to prevent dust, foreign matters and the like from entering the accumulated printing hammer and the yoke portion together with the cooling air 9 to adversely affect the malfunction.
[0005]
In addition, as shown in FIG. 3, the printing hammer is configured as a hammer module 11 for each plurality, and a plurality of these are integrated to constitute a hammer bank. In such a configuration, since the heat radiation fins 8 are divided and mounted as a plurality of hammer modules 11 having a plurality of printing hammers, the heat generated by the coils 7 in each hammer module 11 is effectively dissipated in each divided unit. The heat was radiated only by the fins, and the adjacent radiating fins were only due to air conduction.
[0006]
[Problems to be solved by the invention]
However, the above-described conventional dot line printer has the following problems.
[0007]
For example, in the case of printing in which the hammer module to be driven is limited, heat radiation is performed by the heat radiation fins of each unit divided except for air conduction to the adjacent heat radiation fins, so the heat radiation efficiency is poor, and as a result, the hammer There is a problem that the printing quality is deteriorated due to the thermal deformation or the like and the life of the hammer adsorption surface is reduced.
[0008]
The object of the present invention is to prevent partial concentration of heat of the radiating fins that are separately mounted, disperse the heat to each radiating fin, and improve the heat radiating efficiency, thereby suppressing the temperature rise of the coil and affecting the heat. It is to prevent the deterioration of the printing quality due to the ink and the life reduction of the hammer suction surface.
[0009]
[Means for Solving the Problems]
In order to achieve the above-described problems, the present invention is composed of a leaf spring and a printing pin, and a plurality of dot printing hammers arranged at a predetermined pitch along a printing line, and the printing hammers in a non-printing position. A magnet means for generating a magnetic attraction force to hold the magnet, and a release means provided corresponding to each print hammer for driving the print hammer, and supplied with a pulse current of a predetermined width to cancel the magnetic field of the magnet means. Hammer coils having heat radiation fins for dissipating the heat generated by the electromagnetic coil and the release electromagnetic coil are arranged in two upper and lower stages, and the hammer banks are reciprocated along the row direction, In a dot line printer that drives a hammer for printing, a thermal conductivity between the heat radiating fins is connected to connect the heat radiating fins respectively mounted on the upper and lower hammer banks. The stomach member is mounted.
[0010]
The member having a high thermal conductivity is preferably selected from arbitrary elastic members.
[0011]
As described above, by mounting an elastic member with high thermal conductivity on the radiating fin, it functions as a dust protector that prevents dust, foreign matter, etc. from entering the print hammer and yoke part, and is mounted separately. It is possible to prevent partial concentration of heat of the radiating fins, disperse the heat to each radiating fin, and improve the radiating efficiency.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to the drawings.
[0013]
FIG. 1 shows a side view of a printing hammer of the present invention.
[0014]
The printing hammer includes a yoke 1, a yoke base 3, a front yoke 4, a magnet 2 that generates magnetism, a printing pin 6 that controls printing, a leaf spring 5 that stores printing energy as a spring deflection, and a magnet 2. Is composed of a coil 7 for causing the leaf spring 5 to jump out and forming dots with the printing pins 6, and a radiating fin 8 for releasing the heat generated in the coil 7, and blowing cooling air 9 to the radiating fin 8. Cooling is performed.
[0015]
In the printing hammer constituted as described above, as described above, the elastic member 12 having a high thermal conductivity is mounted between the radiating fins 8 of the upper and lower hammer banks. The heat conductivity between the upper and lower and adjacent heat dissipating fins is increased, heat is dispersed, and the heat dissipating efficiency can be improved.
[0016]
【The invention's effect】
As described above in detail, according to the present invention, by mounting an elastic member having high thermal conductivity on the heat radiating fin, it serves as a conventional dust protector and a part of the heat of the heat radiating fins that are separately mounted. Concentration prevention, heat is distributed to each heat dissipating fin, and heat dissipation efficiency is improved, so that it is possible to suppress deterioration of print quality and life of the hammer suction surface, etc., and always provide a dot line printer with high print quality. It becomes.
[Brief description of the drawings]
FIG. 1 is a side view showing an example of a printing hammer according to the present invention. FIG. 2 is a side view showing a conventional configuration. FIG. 3 is a side view and a top view showing an overall configuration of a hammer bank.
1 is a yoke, 2 is a magnet, 3 is a yoke base, 4 is a front yoke, 5 is a leaf spring, 6 is a printing pin, 7 is a coil, 8 is a heat radiation fin, 9 is cooling air, 10 is a dust protector, and 11 is a hammer module. , 12 represents an elastic member having high thermal conductivity.

Claims (2)

A plurality of dot printing hammers, which are constituted by a leaf spring and a printing pin and arranged at a predetermined pitch along a printing line, and a magnet means for generating a magnetic attraction force for holding the printing hammer at a non-printing position And a release electromagnetic coil provided corresponding to each print hammer for driving the print hammer and supplied with a pulse current of a predetermined width to cancel the magnetic field of the magnet means, and heat generated by the release electromagnetic coil In a dot line printer that has a heat bank for dissipating heat in two upper and lower stages, reciprocally moves the hammer banks in the row direction, and drives each print hammer in the process to perform printing.
A dot line printer, wherein a member having high thermal conductivity is mounted between the heat dissipating fins to connect the heat dissipating fins respectively mounted on the upper and lower hammer banks. The dot line printer according to claim 1,
A dot line printer, wherein the member having high thermal conductivity is an elastic member.

Images