JPS5911744Y2 - Electric sewing machine heat dissipation device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a heat dissipation device for an electric sewing machine that has an electric motor built into the frame. The present invention provides a heat dissipation device for an electric sewing machine having a flow path.

Conventionally, most sewing machines equipped with an electric motor inside the frame have through-holes such as long grooves N and round holes O arranged in a row in the frame F near the electric motor M, as shown in FIG. It was.

However, these through holes were not desirable in that they were clearly visible on the exterior of the sewing machine, had defects that spoiled the exterior appearance of the sewing machine, and the interior of the frame F could be seen from the outside through the through holes.

Therefore, the present invention was devised to eliminate those deficiencies.
The details will be explained with reference to the drawings.

In the figure, reference numeral 1 denotes a sewing machine main body, which is made up of a main body frame 2, a back frame 3 covering the back and sides, a top frame 4, a base frame 5, etc., and is assembled by appropriate mounting means.

Reference numeral 6 denotes an electric motor built into the pillar portion 2a of the main body frame 2, which has a large number of openings 7 for heat dissipation on its outer wall, and a fan (
(not shown) is attached.

Reference numeral 9 denotes a first air flow passage provided at the joint between the front wall 2b of the main body frame 2 and the front wall 5a of the base frame 5, and as shown in FIG. The upper end 5b of the front wall 5a is recessed inward from the front surface along its edge, and the recessed surface 1
0 and the inner wall surface 2C of the lower end of the main body frame 2 are shaped so that they overlap with each other with a slight gap S between them, and air between the outside and the inside of the sewing machine main body 1 passes through the gap S. It is now available for distribution.

This airflow passage 9 is arranged below the mounting position of the electric motor 6 and opens upward.

Reference numeral 11 denotes a second air flow passage provided at the joint between the rear lower end 4a of the upper frame 4 and the rear upper end of the rear frame 3, and the rear lower end 4a of the upper frame 4 is connected to the base frame described above. It is shaped similarly to the upper end 5b of the front wall, so that air can flow through the gap formed.

This airflow passage 11 is arranged above the mounting position of the electric motor 6 and opens downward.

This embodiment has the above-mentioned structure, and the fan rotated by the electric motor 6 drives the electric motor 6 through the opening 7.
After air is drawn into the electric motor 6 and passes through the electric motor 6, the air is discharged from the opening 7.
The hot air generated in the sewing machine is absorbed, loosens, rises, and is discharged to the outside of the sewing machine body 1 through the second air flow passage 11.

Further, external air flows into the sewing machine main body 1 through the first airflow passage 9, and the air is sucked into the electric motor 6.

Therefore, the hot air generated in the electric motor 6 flows into the sewing machine main body 1 through the first air flow path 9 and is absorbed by the air passing through the electric motor 6, thereby preventing the temperature of the electric motor 6 from rising.

In this way, the first air flow passage 9 is provided below the electric motor 6 and the second air flow passage 11 is provided above the electric motor 6 so that air can circulate between the outside and the inside of the sewing machine body 1. The hot air can be radiated to the outside extremely efficiently.

Furthermore, since the air flow passages 9 and 11 are provided at the joint between the main body frame 2 and the base frame 5 or the joint between the top frame 4 and the back frame 3, they can be seen as part of those joints. Since these airflow passages 9 and 11 are inconspicuous, they hardly affect the external shape.

Furthermore, the air flow passages 9, 11 are located at one end of the frame (
The upper end 5a of the base frame 5 or the rear lower end 4a of the upper frame 4 is the end of the other frame (the lower end of the front wall 2b of the main frame 2 or the rear upper end of the back frame 3)
Since the sewing machine body 1 is shaped so as to overlap inside the sewing machine main body 1, it has the advantage that the inside of the sewing machine main body 1 cannot be seen from the outside through the airflow passages 9 and 11.

Moreover, since the airflow passages 9 and 11 are shaped by recessing the upper end 5b of the base frame 5 or the rear lower end 4a of the upper frame 4, they can be shaped very easily.

In this embodiment, air is sucked into the electric motor 6 by a fan rotated by the electric motor 6, but instead of using a fan, air can naturally flow through the electric motor. Needless to say, the same effect can be obtained.

As detailed above, this invention has air flow passages between the inside and outside of the frame in several places near the electric motor among the joints between the frames, so that the hot air from the electric motor can be efficiently transferred to the outside. In addition to being able to dissipate heat, the air flow passage is almost invisible, and the internal mechanism is not visible from the outside through the air flow passage, so the external appearance is not impaired and it is extremely easy to shape. It has excellent effects such as:

[Brief explanation of the drawing]

Figure 1 is a front view of the sewing machine, Figure 2 is II-I of Figure 1.
FIG. 3 is a sectional view taken along line I, FIG. 3 is a perspective view of the sewing machine as seen diagonally from the rear side, and FIG. 4 is a perspective view showing a conventional sewing machine. In the figure, 1 is the sewing machine body, 2 is the main body frame, 3 is the back frame, 4 is the top frame, 5 is the base frame, 6 is the electric motor, 9 is the first air flow passage, 11 is the second air flow passage, S is a gap.

Claims (2)

[Scope of utility model registration request] 1. In an electric sewing machine in which the main body of the sewing machine is formed of a plurality of frames and has an electric motor built therein, an end of one frame is connected to the end of the frame at several points near the electric motor among the joints of the frames. A portion is recessed from the surface along the edge and overlapped with a slight gap between the recessed surface and the inner wall surface of the end of the other frame, and the gap is used to prevent air between the inside of the frame and the outside. A heat dissipation device for electric sewing machines that serves as a circulation path. 2. Claim 1 of the above-mentioned utility model registration, characterized in that the air flow passage is provided at least one location above and below the position where the electric motor is mounted and fixed.
The heat dissipation device for the sewing machine described in section.