JP2000052575A - Dot line printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a printing quality from being lowered by thermal influences and a life of a hammer attraction face from being shortened by mounting a member of a high thermal conductivity between heat radiation fins to connect the heat radiation fins set to an upper and a lower hammer banks. SOLUTION: A printing hammer is constituted essentially of heat radiation fins 8 for letting out the heat generated from coils 7. A cooling wind 9 is blown to the heat radiation fins 8 thereby cooling the fins. An elastic member 12 of a high thermal conductivity is mounted between heat radiation fins 8 of an upper and a lower hammer banks. Accordingly, dust, foreign matter or the like is prevented from invading the printing hammer and a yoke part along with the cooling wind 9 and a heat radiation efficiency between adjacent heat radiation fins is improved. The elastic member 12 acts as a conventional dust protector and moreover prevents the heat of the separately mounted heat radiation fins from being partially concentrated, thereby scattering the heat to each heat radiation fin and improving the heat radiation efficiency. Decrease in printing quality and reduction in life of a hammer attraction face or the like can be restricted. The printing quality is improved at all times.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating movement of a hammer bank holding a plurality of spring-charge type dot printing hammers arranged in a row direction along a row direction. The present invention relates to a printing hammer of a dot line printer that prints lines.

[0002]

2. Description of the Related Art An example of a conventional technique will be described with reference to FIGS.

FIG. 2 shows a printing hammer composed of a leaf spring 5 and a printing pin 6 attached to its tip, for example, a magnet 2.
A spring-charged printing hammer that holds the non-printing position by a magnetic attraction force and supplies a release current of a predetermined pulse width to a release electromagnetic coil 7 (hereinafter simply referred to as a coil) to release the print hammer and print. Is shown. Further, in FIG. 2, a hammer bank in which a plurality of the printing hammers are integrated is a double bank type configuration in which two tiers are arranged in upper and lower stages.

In such a double bank type dot line printer, when cooling the coil 7, cooling air 9 is blown from behind the radiation fins 8 to perform cooling. At this time, a dust protector 10 is mounted to prevent dust, foreign matter, and the like from entering the accumulated printing hammer and yoke portion together with the cooling air 9 and adversely affect operation and the like.

As shown in FIG. 3, the print hammer is configured as a hammer module 11 for each of a plurality of print hammers, and a plurality of these are integrated to form a hammer bank. In such a configuration, the heat radiation fins 8 are divided and mounted as a plurality of hammer modules 11 having a plurality of print hammers, so that the heat generated by the coil 7 in each hammer module 11 is substantially dissipated by each divided unit. The heat was dissipated only by the fins, and only the air was transferred to the adjacent heat dissipating fins.

[0006]

However, the above-mentioned conventional dot line printer has the following problems.

For example, in the case of printing in which the number of driven hammer modules is limited, heat radiation is performed by the radiation fins of each divided unit except for air conduction to the adjacent radiation fins. As a result, there has been a problem that print quality is deteriorated due to thermal deformation of the hammer and the life of the hammer suction surface is shortened.

SUMMARY OF THE INVENTION It is an object of the present invention to suppress a rise in temperature of a coil by preventing partial concentration of heat of radiating fins mounted separately and dispersing the heat to the radiating fins, thereby improving heat radiation efficiency. Another object of the present invention is to prevent a decrease in print quality and a decrease in the life of the hammer suction surface due to heat.

[0009]

In order to achieve the above-mentioned object, the present invention is directed to a plurality of dot printing hammers, which are constituted by leaf springs and printing pins and are arranged at a predetermined pitch along a printing line. And magnet means for generating a magnetic attraction force to hold the print hammer at the non-printing position, and a magnet current for driving the print hammer is provided corresponding to each print hammer, and a pulse current of a predetermined width is supplied. And a hammer bank having a release electromagnetic coil for canceling the magnetic field of the magnet means and radiating fins for radiating heat generated by the release electromagnetic coil is provided in upper and lower two stages, and these hammer banks are reciprocated along the row direction. In a dot line printer which moves and drives each of the printing hammers in the process to print, in order to connect the radiation fins respectively mounted on the upper and lower hammer banks. It was fitted with a high thermal conductivity member between said heat-radiating fins.

The member having a high thermal conductivity is preferably selected from any elastic members.

As described above, the elastic member having high thermal conductivity is mounted on the radiating fins, thereby serving as a dust protector for preventing dust, foreign matter and the like from entering the printed hammer and yoke. Partial concentration of heat of the separately mounted radiating fins can be prevented, and the heat can be dispersed to each of the radiating fins, thereby improving the heat radiation efficiency.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 shows a side view of the printing hammer of the present invention.

The printing hammer includes a yoke 1, a yoke base 3, a front yoke 4, a magnet 2 for generating magnetism, a printing pin 6 for controlling printing, and a leaf spring 5 for storing printing energy as a spring deflection. A coil 7 for canceling the magnetism of the magnet 2 and causing the leaf spring 5 to fly out to form dots by the print pins 6, and a radiation fin 8 for releasing heat generated by the coil 7.
The cooling is performed by blowing cooling air 9 to the radiation fins 8.

In the above-described printing hammer, dust and foreign matter are printed together with the cooling air 9 by mounting the elastic member 12 having high thermal conductivity between the radiating fins 8 of the upper and lower hammer banks as described above. It is possible to prevent intrusion into the hammer and the yoke portion, and the heat conductivity between the upper and lower radiating fins and the adjacent radiating fins is increased, thereby dispersing the heat and improving the radiating efficiency.

[0016]

As described above in detail, according to the present invention, the elastic member having high thermal conductivity is mounted on the radiating fin, so that it functions as a conventional dust protector and is mounted separately. In order to prevent partial concentration of heat, disperse heat to each radiating fin, and improve heat dissipation efficiency,
It is possible to suppress a decrease in print quality and a decrease in life of the hammer suction surface, and to provide a dot line printer with always high print quality.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a printing hammer of the present invention.

FIG. 2 is a side view showing a conventional configuration.

FIG. 3 is a side view and a top view showing the entire configuration of the hammerbank.

[Explanation of symbols]

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 radiating fins, 9 is cooling air, 10 is a dust protector, and 11 is a hammer module. , 12 indicate elastic members having high thermal conductivity.

Claims (2)

[Claims] 1. A plurality of dot printing hammers, each comprising a leaf spring and a printing pin, arranged at a predetermined pitch along a printing line, and a magnetic attraction force for holding the printing hammer at a non-printing position. And a release electromagnetic coil and a release electromagnetic coil which are provided in correspondence with each print hammer to drive the print hammer and are supplied with a pulse current of a predetermined width to cancel the magnetic field of the magnet means. A hammer bank having radiating fins for radiating the heat generated by the coil is provided in upper and lower two stages, and these hammer banks are reciprocated along the row direction, and in the process, the respective printing hammers are driven to print dots. In the line printer, a member having high thermal conductivity is mounted between the radiating fins so as to connect the radiating fins respectively mounted on the upper and lower hammer banks. And a dot line printer. 2. The dot line printer according to claim 1, wherein said member having a high thermal conductivity is an elastic member.