JPH11227295A - Mechanism and method for cooling dot impact line printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling mechanism and method for dot impact line printer in which cooling effect on a heated hammer bank can be enhanced. SOLUTION: The cooling mechanism for dot impact line printer comprises a cooling duct 2 provided respectively, at the opposite ends in the beam direction, with a cooling wind suction port 3 and a cooling wind exhaust port 4 and fixed to a hammer bank 1 wherein the ventilation area is set smaller in the central part as compared with the opposite ends. Since pressurized cooling wind can advance through a space enclosed by the cooling duct 2 and the hammer bank 1, temperature bank of the hammer bank 1 can be made uniform and cooling efficiency can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a cooling mechanism and a cooling method for a dot impact line printer. More specifically, the present invention relates to a cooling mechanism and a cooling method for a dot impact line printer including a hammer bank having a plurality of print hammers.

[0002]

2. Description of the Related Art Conventionally, in a dot impact line printer, for example, a cooling mechanism shown in FIGS. 6 and 7 is known as a cooling mechanism for cooling a hammer bank which generates heat by a printing operation of a printing hammer driven at high speed. ing. This cooling mechanism has a cylindrical cooling duct 2 located in the vicinity of the hammer bank 1 and extending in the girder direction. A cooling air inlet 3 is provided at one end of the cooling duct 2, and a cooling air outlet 4 is provided on a side surface of the cooling duct 2 on the side of the hammer bank 1.

When cooling the hammerbank 1, the cooling air introduced from the cooling air inlet 3 travels through the cooling duct 2 and is uniformly discharged from the cooling air outlet 4 in the direction of the arrow in the figure. Is done. The discharged cooling air is blown onto the hammerbank 1 to cool the hammerbank 1.

[0004]

However, the above-mentioned conventional cooling mechanism has the following problems. That is, as shown in FIG. 6, since the cooling air blows uniformly from the cooling air exhaust port 4 in the direction of the arrow to the hammer bank 1, the cooling air blown to the hammer bank 1 has a large pressure loss and the cooling air amount is large. In some cases, the hammer bank 1 cannot be cooled efficiently due to the shortage, and as a result, the speeding up of the printing process of the dot impact line printer has been hindered.

In addition, since the hammerbank 1 generates heat uniformly, the center portion of the hammerbank 1 has a higher temperature than both ends at which heat is easily released due to the shape of the hammerbank 1 extending in the spar direction. However, since the cooling air blows uniformly to the hammerbank 1, the temperature at the center of the hammerbank 1 remains higher than at both ends. Therefore, cooling may not be performed efficiently because the temperature distribution of the hammer bank 1 is not uniform, and as a result, speeding up of the printing process of the dot impact line printer may be hindered. The present invention has been made in view of the above-described problems in the related art, and provides a cooling mechanism and a cooling method of a dot impact line printer capable of improving cooling efficiency with respect to heat generation of a hammerbank. Aim.

[0006]

According to the present invention, there is provided a cooling mechanism for a dot impact line printer having a hammer bank having a print hammer. A cooling mechanism for a dot impact line printer, comprising a cooling duct provided with a cooling air suction port at one end and a cooling air exhaust port at the other end. By attaching a cooling duct to the hammerbank, providing a cooling air intake port at one end in the girder direction, and providing a cooling air exhaust port at the other end, the cooling air pressurized in the space sealed by the cooling duct and the hammerbank. Since it is possible to proceed without losing the amount of cooling air on the way, the heat of the hammerbank can be efficiently transported and discharged.

According to another aspect of the present invention, there is provided a dot impact line printer according to claim 1, wherein the cooling air exhaust direction of the cooling air exhaust port is set as a girder direction. Cooling mechanism. By setting the cooling air exhaust direction of the cooling air exhaust port to the girder direction, the cooling air is discharged in the girder direction, so that the cooling air can proceed without losing the amount of cooling air on the way. The heat of the bank can be efficiently transported and discharged.

According to another aspect of the present invention, there is provided a cooling duct having a ventilation passage for a cooling wind which advances along a girder direction.
2 is a cooling mechanism of the dot impact line printer. Since the cooling duct has a ventilation path for the cooling air that travels along the girder direction, the cooling air can travel along the girder direction, so that the heat of the hammerbank is efficiently transported and discharged. Can be.

According to another aspect of the present invention, there is provided a cooling duct, wherein a cross-sectional area of ventilation at a central portion of the cooling duct is smaller than cross-sectional areas of ventilation at both ends. Is a cooling mechanism of the dot impact line printer. By making the cross-sectional area at the center of the cooling duct smaller than the cross-sectional area at both ends, the velocity of the cooling air at the center of the cooling duct becomes faster than at both ends, and the heat in the center of the hammerbank is absorbed more than at both ends. Therefore, the temperature distribution of the hammer bank can be made uniform, and the cooling efficiency can be improved.

According to another aspect of the present invention, there is provided a cooling duct, wherein the cross-sectional area of the cooling duct is smaller from both ends to the center.
2 is a cooling mechanism of the dot impact line printer. By reducing the cross-sectional area of the cooling duct as it goes from both ends to the center, the wind speed of the cooling air in the cooling duct becomes faster as it goes from both ends to the center, so that the center of the hammerbank absorbs more heat The temperature distribution of the hammer bank can be made uniform, and the cooling efficiency can be improved.

According to another aspect of the present invention, there is provided a cooling mechanism for a dot impact line printer according to any one of claims 1 to 3, wherein a throttle is provided at a central portion of the cooling duct. By providing a throttle in the center of the cooling duct, the wind speed of the cooling air at the throttle at the center of the cooling duct is faster than at both ends, and the heat distribution at the center of the hammerbank is absorbed more than at both ends. The cooling efficiency can be made uniform and the cooling efficiency can be improved.

Further, according to the present invention, which is provided to solve the above-mentioned problems, a cross-sectional area of a ventilation duct at a portion of a cooling duct corresponding to a portion of the hammer bank which generates a relatively large amount of heat is reduced. Item 4 is a cooling mechanism of the dot impact line printer according to any one of Items 1 to 3. By reducing the ventilation cross-sectional area of the cooling duct corresponding to the part of the hammerbank that generates a relatively large amount of heat, the cooling air in the part of the large amount of heat is relatively high in speed, and Since a large amount of heat is drawn, the temperature distribution of the hammerbank can be made uniform, and the cooling efficiency can be improved.

According to another aspect of the present invention, there is provided a method for cooling a dot impact line printer including a hammer bank having a print hammer, the cooling duct being attached to the hammer bank in one end in a girder direction. A cooling method for a dot impact line printer characterized by discharging cooling air introduced from the other end from the other end. By discharging the cooling air introduced from one end in the girder direction of the cooling duct attached to the hammerbank from the other end, the cooling air pressurized in the space enclosed by the cooling duct and the hammerbank reduces the amount of cooling air on the way. Since it can proceed without loss, the heat of the hammerbank can be efficiently transported and discharged.

According to another aspect of the present invention, there is provided a method for cooling a dot impact line printer according to claim 8, wherein the cooling air travels in a girder direction. By moving the cooling air along the girder direction, the pressurized cooling air can proceed without losing the amount of cooling air on the way, so that the heat of the hammerbank is efficiently transported and discharged. Can be.

Further, the present invention provided to solve the above-mentioned problem is performed so that the cooling wind at a portion of a cooling duct corresponding to a portion of the hammerbank which generates a relatively large amount of heat is relatively high. A method for cooling a dot impact line printer according to claim 8 or 9. Temperature distribution of the hammerbank to absorb more heat from the heat-generating part by making the cooling air flow in the part of the cooling duct corresponding to the part of the hammerbank generating a relatively large amount of heat relatively high. Can be made uniform, and the cooling efficiency can be improved.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 is a perspective view showing a dot impact line printer provided with a cooling mechanism of the dot impact line printer according to one embodiment of the present invention. 2 and 3 are a perspective view and a sectional view, respectively, showing a cooling mechanism of the dot impact line printer according to one embodiment of the present invention.

The cooling mechanism of the dot impact line printer according to the present embodiment is installed in a printing mechanism section 12 inside the dot impact line printer as shown in FIG. This is to cool the hammer bank 1 in the printing mechanism unit 12 that generates heat when the cooling air is blown by the blower 15. The cooling mechanism of the dot impact line printer according to the present embodiment has a cylindrical cooling duct 2 extending in the girder direction as shown in FIGS. This cooling duct 2
Is attached to the hammer bank 1 arranged facing the platen 5, a cooling air introduction port 3 connected to a cooling air introduction pipe 7 is provided at one end of the cooling duct 2, and a cooling air introduction port 3 is provided at the other end of the cooling duct 2. A cooling air exhaust port 4 opened in the girder direction is provided. A throttle 6 is provided on the upper central side surface of the cooling duct 2 so that the cross-sectional area of ventilation at the center of the cooling duct 2 is smaller than the cross-sectional area of ventilation at both ends.

As shown in FIG. 3, after the sheet 8 is conveyed to a printing position on the platen 5 by a sheet conveying means (not shown), printing is started. During printing, the hammer bank 1 generates heat because the printing hammer in the hammer bank 1 is driven at high speed. In order to cool the heat generated by the hammer bank 1, the cooling air pressurized by the blower 15 is introduced from the cooling air introduction pipe 7 into the cooling duct 2. The cooling air introduced into the cooling duct 2 removes the heat of the hammerbank 1 and
Proceed through the enclosed space in the direction indicated by the arrow in FIG.
The cooling air is discharged from the exhaust port 4. Here, cooling duct 2
A throttle 6 is provided on the upper central side surface of the cooling duct 2 so that the ventilation cross-sectional area at the central portion of the cooling duct 2 is smaller than the ventilation cross-sectional areas at both ends. It is faster than both ends and absorbs more heat at the center of the hammerbank 1 than at both ends.

Therefore, according to the cooling mechanism of the dot impact line printer described above, as shown in FIG. The cooling air pressurized in the space sealed by the hammer bank 1 can proceed without losing the amount of cooling air on the way.
Heat can be efficiently transported and discharged. Further, according to the cooling mechanism of the dot impact line printer described above, the throttle 6 is provided so that the ventilation cross-sectional area at the center of the cooling duct 2 is smaller than the ventilation cross-sectional areas at both ends. In the part, the wind speed of the cooling air is higher than that at both ends, and the heat quantity at the center of the hammerbank 1 is sucked up more than at both ends, so that the temperature distribution of the hammerbank 1 can be made uniform and the cooling efficiency can be improved. it can.

(Second Embodiment) FIGS. 4 and 5 are a perspective view and a sectional view, respectively, showing a cooling mechanism of a dot impact line printer according to another embodiment of the present invention.

The cooling mechanism of the dot impact line printer according to the present embodiment is installed in the printing mechanism 12 inside the dot impact line printer as shown in FIG. The hammerbank 1 in the printing mechanism 12 that generates heat when printing on the paper 8 conveyed from the printer 13 is cooled by the cooling air pressurized by the blower 15. The cooling mechanism of the dot impact line printer according to the present embodiment has a cylindrical cooling duct 2 extending in the girder direction as shown in FIGS. The cooling duct 2 is attached to a hammer bank 1 arranged to face the platen 5. At one end of the cooling duct 2, a cooling air introduction port 3 connected to a cooling air introduction pipe 7 is provided. At the other end, a cooling air exhaust port 4 opened in the direction of the girder is provided. As shown in FIG. 4, the center of the side surface of the cooling duct 2 is narrowed so that the cross-sectional area of the ventilation becomes smaller from both ends to the center.

As in the first embodiment, as shown in FIG. 5, after the sheet 8 is conveyed to the printing position of the platen 5 by a sheet conveying means (not shown), printing is started. During printing, the hammer bank 1 generates heat because the printing hammer in the hammer bank 1 is driven at high speed. In order to cool the heat generated by the hammer bank 1, the cooling air pressurized by the blower 15 is introduced from the cooling air introduction pipe 7 into the cooling duct 2. The cooling air introduced into the cooling duct 2 travels in the closed space in the cooling duct 2 in the direction indicated by the arrow in FIG. 4 while removing heat from the hammer bank 1, and is discharged from the cooling air exhaust port 4. . Here, since the center of the side surface of the cooling duct 2 is narrowed so that the cross-sectional area of the ventilation becomes smaller as going from both ends to the center, the wind speed of the cooling air in the cooling duct goes from both ends to the center. As it goes to the center of the hammerbank 1, more heat is absorbed.

Therefore, according to the cooling mechanism of the dot impact line printer described above, as shown in FIG. The cooling air pressurized in the space sealed by the hammer bank 1 can proceed without losing the amount of cooling air on the way.
Heat can be efficiently transported and discharged. Further, according to the cooling mechanism of the dot impact line printer described above, the cooling duct 2 has a side portion that is narrowed at the center so that the cross-sectional area of the ventilation becomes smaller from both ends toward the center. Since the wind speed of the cooling air in 2 becomes faster from both ends toward the center, and the amount of heat is drawn up toward the center of the hammerbank 1, the temperature distribution of the hammerbank 1 can be made uniform and the cooling efficiency can be improved. Can be achieved. Note that the shape of the cooling duct 2 is not limited to those described in the first and second embodiments, and a throttle is provided in a portion of the cooling duct 2 corresponding to a portion of the hammer bank 1 that generates a relatively large amount of heat. Any shape is acceptable.

As described above, according to the cooling mechanism and the cooling method of the dot impact line printer according to the present invention, the cooling duct is attached to the hammer bank, the cooling air suction port is provided at one end in the girder direction, and the cooling air is provided at the other end. By providing the air exhaust port, the cooling air pressurized in the space sealed by the cooling duct and the hammer bank can proceed without losing the cooling air amount on the way. Therefore, the heat quantity of the hammerbank can be efficiently transported and discharged, so that the cooling efficiency can be improved. Further, the cooling mechanism of the dot impact line printer according to the present invention, by making the ventilation cross-sectional area at the center of the cooling duct smaller than the ventilation cross-section at both ends, the cooling air velocity at the center of the cooling duct is lower than that at both ends. It is faster and can absorb more heat at the center of the hammerbank than at both ends. Therefore, since the temperature distribution of the hammerbank can be made uniform, the cooling efficiency can be improved. Further, the cooling method of the dot impact line printer according to the present invention is characterized in that the cooling air introduced from one end in the girder direction of the cooling duct attached to the hammerbank is discharged from the other end, whereby the cooling duct and the hammerbank are sealed. The cooling air pressurized in the closed space can proceed without losing the amount of cooling air on the way.
Therefore, the heat quantity of the hammerbank can be efficiently transported and discharged, so that the cooling efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a dot impact line printer provided with a cooling mechanism of the dot impact line printer according to the present invention.

FIG. 2 is a perspective view showing an example of a cooling mechanism of the dot impact line printer according to the present invention.

FIG. 3 is a sectional view taken along the line III-III of FIG. 2 showing an example of a cooling mechanism of the dot impact line printer according to the present invention.

FIG. 4 is a perspective view showing an example of a cooling mechanism of the dot impact line printer according to the present invention.

FIG. 5 is a sectional view taken along line VV of FIG. 4 showing an example of a cooling mechanism of the dot impact line printer according to the present invention.

FIG. 6 is a perspective view showing a cooling mechanism of a conventional dot impact line printer.

FIG. 7 is a cross-sectional view showing a cooling mechanism of a conventional dot impact line printer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hammer bank 2 Cooling duct 3 Cooling air introduction port 4 Cooling air exhaust port 5 Platen 6 Restrictor 7 Cooling air introduction pipe 8 Paper 9 Ink ribbon 10 Operation section 11 Ribbon feed unit 12 Printing mechanism section 13 Paper transport section 14 Cooling mechanism section 15 Blower 16 power supply

Claims (10)

[Claims] 1. A cooling mechanism for a dot impact line printer having a hammer bank having a print hammer, wherein the cooling mechanism is attached to the hammer bank, and a cooling air suction port is provided at one end in a girder direction and a cooling air exhaust port is provided at the other end. A cooling mechanism for a dot impact line printer, comprising a cooling duct provided. 2. The cooling mechanism for a dot impact line printer according to claim 1, wherein a cooling air exhaust direction of the cooling air exhaust port is set as a girder direction. 3. The cooling mechanism for a dot impact line printer according to claim 1, wherein the cooling duct has a ventilation path for cooling air traveling along the girder direction. 4. The cooling duct according to claim 1, wherein a cross-sectional area of ventilation at a central portion of the cooling duct is smaller than cross-sectional areas of ventilation at both ends.
4. The cooling mechanism of the dot impact line printer according to any one of items 3 to 3. 5. The cooling mechanism for a dot impact line printer according to claim 1, wherein the cross-sectional area of the ventilation duct of the cooling duct becomes smaller from both ends to the center. 6. A cooling mechanism for a dot impact line printer according to claim 1, wherein a throttle is provided at a central portion of the cooling duct. 7. The cooling of a dot impact line printer according to claim 1, wherein a cross-sectional area of the cooling duct corresponding to a portion of the hammer bank which generates a relatively large amount of heat is reduced. mechanism. 8. A cooling method for a dot impact line printer having a hammer bank having a print hammer, wherein the cooling air introduced from one end in the beam direction of a cooling duct attached to the hammer bank is discharged from the other end. Characteristic dot impact line printer cooling method. 9. The cooling method for a dot impact line printer according to claim 8, wherein the cooling air travels along the girder direction. 10. The dot impact line printer according to claim 8, wherein the cooling air at a portion of the cooling duct corresponding to a portion of the hammer bank which generates a relatively large amount of heat is relatively high in speed. Cooling method.