JPS6161992B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a printing device having multiple heat generation sources, such as an impact line printer. The present invention relates to a printing device that uses the following methods.

[Background of the Invention] For cooling purposes, a printing device is provided with two vent holes 1 (an air intake port and an air outlet port) on the side surface of a housing 2, as shown in FIG. Most of the vent holes 1 are provided with the intention of cooling only the parts that generate a large amount of heat, and consideration for cooling other heat sources tends to be lacking. This results in an overall temperature rise. Even if local cooling is performed by increasing the temperature inside the housing 2, there is a limit to the cooling effect. This is because the surface area of the cooling part is considerably smaller than the surface area of the entire heat generating source. For this reason, there is a limit to the cooling effect, and when trying to suppress the temperature rise within a certain range in a portion that is susceptible to temperature rise, more air volume than necessary is wasted. Furthermore, since the vent 1 has a shutter structure or a structure with a large number of long holes, noise becomes a big problem. Printing devices, particularly impact type printing devices, produce large noises because they print by striking the type, and the noise emitted through the vent 1 poses a major problem in terms of soundproofing.

[Object of the Invention] An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, increase the cooling effect of this type of printing device, and provide a printing device with less noise.

[Summary of the Invention] The present invention provides that, among the power supply section, card basket section, printing mechanism section, etc. that constitute a printing device and serve as a heat generation source, the power supply section and the card basket section generate a small amount of heat, but the card basket section generates a small amount of heat. requires very strict temperature control, and the printing mechanism generates the largest amount of heat and is the part where cold air turns into warm air, so the order in which each part is cooled must be considered, and air stagnation must be minimized. Focusing on the fact that cooling increases the cooling effect and that sound travels in a straight line (except for some diffraction phenomena), the arrangement of each part such as the power supply section, card basket section, printing mechanism section, etc. is adjusted to the flow of cooling air. In addition, an inlet and an outlet are provided at the bottom of the casing, and a partition plate is provided so that air, that is, cooling air, flows in a constant direction from the inlet to the outlet within the casing without stagnation. This is characterized by the fact that it is possible to improve the cooling effect and to prevent direct noise from being emitted. The second example is shown below.
The present invention will be explained with reference to the figures.

[Embodiment of the Invention] In FIG. 2, heat sources include a power supply section 3, a card basket section 4, a printing hammer section 5, a motor section 6, and the like. The locations where the temperature rise is severely restricted are the card basket section 4 and the printing hammer section 5.
Although it is sufficient to provide the ventilation hole 1 shown in FIG. 1 to cool only this area, the above-mentioned problems will occur if this is done. Further, as described above, the printing mechanism section consisting of the printing hammer section 5 and the motor section 6 is the part that generates the maximum amount of heat and converts cold air into warm air. Therefore, arranging the power supply section 3 and the card basket section 4 behind the cooling air passage of the printing mechanism section means that the warm air is
and the card basket section 4, which is not a good idea.

As shown in FIG. 2, the present invention includes a printing mechanism section consisting of a printing hammer section 5 and a motor section 6 at the top of the housing 2, a paper supply section at the lower front of the printing mechanism section, and a power supply section 3 at the rear of the lower part. Warm air is discharged to the side bottom of the casing 2 where the card basket section 4 is arranged, and where the intake port 7 for inhaling cold air and the paper supply section are located at the bottom of the casing 2 where the power supply section 3 and card basket section 4 are located. In addition, a partition plate 9 extending vertically is provided to separate and define the paper supply section, the power supply section 3, and the card basket section 4. Instead of going directly to the air, an air flow path is formed so that it bypasses the inside of the housing 2 and reaches the outlet 8 while cooling each heat generating source.This allows the air to flow in only one direction and prevents warm air from stagnation. The cold air is discharged from the outlet 8 without any problem, and the cold air is drawn in from the intake port 7 one after another.

Air flow will be explained with reference to FIG. The cold air 10 sucked in through the suction port 7 cools the power supply section 3 and the card basket section 4, is sucked by the cooling fan 11, cools the printing hammer section 5, and then reaches the motor section 6. The air that has cooled the motor section 6 passes through the ventilation hole 12 and is discharged into the housing 2 by a warm air discharge fan 13 located at the bottom of the housing 2.
As a result, the stagnation of warm air inside the housing 2 is eliminated,
As the cooling effect increases, the casing 2 also improves its top, side,
The front and back sides are completely covered, so there is no direct noise.

Note that the sound leaking from the suction port 7 and the discharge port 8 is very small. The reason for this is that in a general printing device, the printing mechanism is located above the housing 2, as shown in FIG. 2, and this mechanism is the main source of noise. That is, the noise generated from the noise source is repeatedly reflected within the housing 2 several times, and the intensity of the sound is extremely attenuated by the time it reaches the inlet 7 and outlet 8 at the bottom of the housing 2. Further, the noise passing through the inlet 7 and the outlet 8 further weakens as it hits the floor, and a protrusion 14 is provided on the bottom of the housing 2, which is designed to block the weakened sound. .

As described above, the present invention has a great advantage in terms of soundproofing, and it has become possible to reduce noise by about 4 to 6 dB (A) compared to the conventional printing device shown in FIG.

In the above embodiment, a cooling fan is provided at each of the inlet port 7 and the outlet port 8, but even if the cooling fan 13 is provided only at the outlet port 8,
Since the inside of the casing 2 is shaped like a duct, the inside of the casing 2 becomes a negative pressure due to warm air being discharged, so cold air is sucked in from the suction port 7 and a similar effect can be expected.
Further, although the fans 11, 13, etc. are used for the purpose of flowing air, a blower or the like may be used instead.

[Effects of the Invention] According to the present invention, since an air flow path from the inlet to the outlet is formed throughout the housing, cold air flows without stagnation within the housing, and the entire heat source is efficiently cooled. A good cooling effect can be obtained. In addition, the printing mechanism, which generates the largest amount of heat, is cooled by the still-cold cooling air that has passed through the power supply section and card basket section, which generate relatively little heat, so that each part can be cooled efficiently. Become. Furthermore, by providing the cooling inlet and outlet at the bottom of the casing, the noise inside the casing is not directly emitted, resulting in effects such as reduced noise.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a conventional printing device;
FIG. 2 is a longitudinal sectional view showing an embodiment of the printing apparatus of the present invention. In the figure, 1 is a vent, 2 is a housing, 3 is a power supply part, 4 is a card basket part, 5 is a printing hammer part, 6 is a motor part, 7 is an inlet port, 8 is an outlet port, 9 is a partition plate, 10 is a cold air, 11 and 13 are fans, 12 is a ventilation hole, and 14 is a housing protrusion.

Claims (1)

[Scope of Claims] 1. A printing device in which a printing mechanism section having a printing hammer section at the upper part, a paper supply section at the front of the lower part, a power supply section and a card basket section at the rear of the lower part are housed in one housing, an inlet for inhaling cold air provided at the bottom of the casing where the power supply section and the card basket section are located; an outlet for discharging warm air provided at the side bottom of the casing where the paper supply section is located; A partition plate is provided that extends vertically to separate and define the paper supply section, the power supply section, and the card basket section, and the cold air sucked through the suction port is provided with a partition plate that separates and defines the paper supply section, the power supply section, and the card basket section. A printing device characterized in that the printing device moves to the outlet while cooling the printing device.