JPS62119080A - Dot matrix line printer - Google Patents

Abstract

PURPOSE:To obtain a dot matrix printer showing good cooling effect even in high-speed operation, by providing a cooling fan at least to the single end of a printing head in the moving direction thereof. CONSTITUTION:A coil 6 for opening a printing hammer is wound around a yoke 3. A suction fan 7a and an exhaust fan 7b are provided to both ends of a printing head assembly 10 in the sweep direction thereof and fixed to a printing head 10 by brackets 8, 9 in a direction for permitting wind to pass through the space surrounded by yokes 2, 3, a permanent magnet 11 nd a printing hammer. When a current is made to flow to the coil 6, a dot is printed on printing paper by the printing pin 5 mounted to the free end of the printing hammer through an ink ribbon. The coil 6 generates heat by this printing operation but is cooled by air sent by the suction fan 7a provided to the printing head 10, while heated air is exhausted out of the printing head 10 by the exhaust fan 7b.

Description

Detailed Description of the Invention Technical Field The present invention relates to a dot matrix line printer that prints by moving a print head in which a plurality of unit printing mechanisms are arranged in a row at right angles to the paper feed direction, and in particular to a cooling system for the print head. Regarding the mechanism.

Prior Art In conventional dot matrix line printers,
As shown in FIG. 2, the permanent magnet 1 is sandwiched between yokes 21115 and 3, and the printing hammer 4 is attached to the yoke 2. The printing hammer 4 is a kind of cantilever spring, and a printing pin 5 for printing dots is attached to its free end.

The printing hammer 4 is normally attracted to the yoke 3 by the magnetic force of the permanent magnet 1. A coil 6 is wound around the yoke 3 to release the printing hammer 4, and when a current is applied during printing, the magnetic force of the permanent magnet 1 is canceled out, and the printing hammer 4 separates from the yoke 3 to release the ink ribbon (not shown). Print dots on paper via

In order to cool down the heat generated by the coil 60 during this printing operation, a cooling fan 7 is provided directly below the print head assembly.

In this conventional print head cooling mechanism, the yoke obstructs the wind from directly hitting the coil, and heat is trapped in the space surrounded by the print hammer, yoke, and permanent magnet. In other words, the conventional cold 1181 side is a mechanism that cools the entire print head, so it is inefficient and can handle slow printing speeds, but as the printing speed increases, the cooling cannot keep up and the coils may burn out due to heat generation. Problems such as deterioration of the properties of the permanent magnets occurred, which was a major factor limiting the speeding up of dot matrix line printers.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to provide a dot matrix line printer that can operate at high speeds and has good cooling effects.

Structure of the Invention According to the present invention, there is provided a dot matrix line printer that prints by moving a print head in which a plurality of unit printing grooves are arranged in a row at right angles to the paper feeding direction, wherein the movement of the print head A dot matrix line printer characterized in that a cooling fan is provided at at least one end in the direction is obtained.

EXAMPLE Next, the present invention will be explained in more detail with reference to the drawings showing an example of the present invention.

Referring to FIG. 1, in one embodiment of the present invention, three permanent magnets 1 are sandwiched between yokes 2 and 3, and a printing hammer (not shown) is fixed to yoke 2 in correspondence with yoke 3. has been done. A printing pin 5 on which the drivers 1 to 1 print is attached to the free end of the printing hammer, and is normally attracted to the yoke 3 by the magnetic force of the permanent magnet 1. A coil 6 is wound around the yoke 3 for releasing the printing hammer. An intake fan 7a and an exhaust fan 7b are provided at both ends of the print head assembly 10 in the sweep direction, and these fans allow air to pass through a space surrounded by the yokes 2 and 3°, the permanent magnet 1, and the printing hammer. It is fixed to the print head 10 by brackets 8 and 9 in the orientation.

When current is applied to the coil 6, the magnetic force of the permanent magnet 1 is canceled and the printing hammer leaves the yoke 3, converts the strain energy accumulated in itself into kinetic energy, and attaches it to the free end of the printing hammer. Dots are printed on the printing paper via the ink ribbon using the printed printing bin 5. During this printing operation, the coil 6 generates heat, but the coil 6 is cooled by the air sent by the suction fan 7a provided in the print head 10, and the warmed air is discharged to the outside of the print head 10 by the exhaust fan 7b.

In the embodiment described above, the fan 7a is a suction fan;
Although the fan 7b is an exhaust fan, it may be of the reverse configuration of 114, and the number of fans is not limited to two, but may be one.
It suffices if it is more than 1.

As described in detail, according to the dot matrix line printer according to the present invention, the coil can be directly cooled by providing a fan directly on at least one side of the print head in the sweep direction. In addition, it can relieve the heat buildup in the space surrounded by the yoke, permanent magnet, and printing hammer.
Print head cooling becomes more efficient and reliability is improved.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2 is a perspective view of a print head of a conventional dot matrix line printer. Explanation of symbols of main parts 6...Coils 7a, 7b...Fan

Claims (1)

[Claims] A dot matrix line printer that prints by moving a print head in which a plurality of unit printing mechanisms are arranged in a row at right angles to a paper feeding direction, and a cooling fan is provided at at least one end of the print head in the direction of movement. A dot matrix line printer characterized by: