JPH048394A - Arm structure of sewing machine - Google Patents

Abstract

PURPOSE:To prevent overheat by heat transfer to surfaces of a sewing machine such as outer wall of an arm and a cover and to use no lubricating oil for cooling a driving gear so as to prevent the lubricating oil from adhering to a cloth with simplified device constitution by providing the outer wall of the arm and the cover in the periphery of the driving gear and forming a cooling space of the outer wall and the cover. CONSTITUTION:A slight space 16 is formed between a wall part 15 and a sleeve 10 by overhanging the wall part 15, positioned in a reverse side of the sleeve 10 of the outer wall of an arm 2, a little to the outside. A motor 1 is cooled by air by introducing the air from the outside through an introducing hole by rotating a fan 26. Heat, generated from the motor 1, is partly transmitted to the outside through the sleeve 10, but the heat is cut off by an air layer of the space 16. Similarly, the outside of the sleeve 10 is coated with a cover 6 through the predetermined space, so that a similar air layer is formed between the cover 6 and the sleeve 10, and this air layer plays a role of insulating heat.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an arm structure for a sewing machine in which a drive device is built into the arm.

[Prior Art] Conventionally, an AC motor or the like has been used as a device for driving a sewing machine, and this motor is usually installed under the table of the sewing machine. Furthermore, in recent years, sewing machines in which a motor is built into the arm have become known in order to make the sewing machine more compact.

However, when the motor is housed in the arm, there is a problem that the heat generated by the motor is transmitted to the outer wall surface of the arm, resulting in a deterioration of the working environment such as the risk of burns for the worker. Therefore, as a measure against the heat generated by the motor, a technology has been proposed in which lubricating oil from the sewing machine is supplied to the motor to cool it (Japanese Patent Laid-Open No. 60-194885
(see publication).

[Problems to be Solved by the Invention] However, when using lubricating oil to cool the motor in this way, another problem arises in that a large H lubricating oil is required, and furthermore, in the event of an oil leak, However, it is not always desirable to use lubricating oil because it may adhere to sewn items and ruin the product.

SUMMARY OF THE INVENTION An object of the present invention is to provide an arm structure for a sewing machine that suitably prevents deterioration of the working environment due to heat without using lubricating oil.

[Means for Solving the Problems] The present invention to solve such problems provides an arm structure for a sewing machine in which a drive device is built into the arm, and a structure around the drive device is formed integrally with an outer wall of the arm. A cooling space is provided between the wall and the outer wall, and a cooling space is provided between the wall and the cover. This article focuses on the arm structure of a sewing machine, which is characterized by its structure.

[Function] The present invention relates to a sewing machine of a type in which a driving device is built in, for example, a horizontal portion of an arm, and the driving device is surrounded by a wall portion and is also connected to the outer wall of the arm through a space at a predetermined interval. It is covered with a cover and has a double structure.

Generally, a drive device gradually becomes hot during use, but in the present invention, the heat is transferred from the drive device through the wall.
It is transmitted to the air within the space of the double structure. However, since air is not a good conductor of heat, heat is difficult to transfer from the air to the outer wall or cover of the arm.

In other words, in the present invention, by providing a cooling space with a double structure, it is difficult for the heat generated in the drive device to be transmitted to the outer wall surface of the arm of the sewing machine, so that the surface of the arm becomes excessively hot. This will be prevented.

[Example] Hereinafter, an example of the present invention will be described based on the drawings. 1 and 2 show an industrial sewing machine 3 in which a motor 1 is built into an arm 2. As shown in FIG.

The arm 2 of the sewing machine 3 of this embodiment is manufactured by die-casting aluminum, and has an outer wall that surrounds the internal structure.

This arm 2 has a lower arm 4. It can be separated into three parts like the lid 5 and the cover 6, and a motor is arranged at the end of the arm 2 on the pillar part 7 side. The other end, that is, the head 8 side, houses a needle bar, presser bar, etc. (not shown), and
Electrical components such as thread wiper solenoid 9 are installed.

A cylindrical wall (sleeve)] 0 is formed on the upper part of the pillar part 7 to cover the circumference of the motor 1. A large number of inner grooves 11 are formed along the sleeve.The upper part of the arm 2, except for the area around the sleeve 0, is covered by the removable lid 5 mentioned above. The internal structure of mag. 12 is exposed.

A cover 6 is attached to the outside of the sleeve 10, and an introduction hole (not shown) for introducing air is formed in the tip 3 of the cover 6. On the outer surface, concentric outer grooves 14 are provided to improve heat dissipation.

Among the outer walls of the arm 2, a wall portion V5 located on the back side of the sleeve]0 slightly protrudes outward, and the sleeve]0
A slight space]6 is formed between the two. Furthermore, support walls 20 and 21 are formed at two locations from the front wall 17 to the back wall 8 of the horizontal portion of the arm 2,
Cutouts 22 and 23 are formed between the tip of the support wall 20° 2 and the back side wall 18, respectively.

A fan 26 for introducing cooling air is provided on the inner end 24 side of the motor 1.
It is attached to a timing pulley 27 that is connected to a drive shaft 25 (Fig. 2) of a motor.A timing belt 28 that transmits driving force to a lower shaft (not shown) is hung on the timing pulley 27. .

Furthermore, the drive shaft 25 and the upper shaft] 2 are coaxially connected by a coupling 29, and the upper shaft] 2
It extends to the head 8 through the two support walls 20 and 21, and transmits driving force to the needle bar and the like.

Such a configuration provides the following effects.

When the motor 1 is switched on and actual sewing work is performed, the drive shaft 25 of the motor 1 rotates and
Fan 26 rotates. As the fan 26 rotates, air is introduced from the outside through the introduction hole, and the motor is cooled by this air.

Also, part of the heat generated from the motor 1 is transferred to the outside via the sleeve 10, but there are
Since a predetermined space is formed by the outer wall of the arm 2, heat is blocked by the air layer. Similarly, since the outside of the sleeve [0] is covered by the cover 6 through a predetermined space, a similar air layer is formed between the cover 6 and the sleeve 10, and this air layer is used for heat insulation. do the work.

In this way, in this embodiment, the arm 2 and the cover 6 form a double structure, so the heat insulation effect is high. Therefore, the surface of the arm 2 is prevented from overheating. Workers can work in a suitable environment without the risk of getting burned.Furthermore, since no lubricating oil is required to cool the motor 1, the equipment configuration is simplified, and lubricating oil is not required. It has the remarkable effect that there is no risk of it adhering to cloth or the like.

[Effects of the Invention] In the present invention, the outer wall of the arm and the cover are provided around the drive device, thereby forming a cooling space. Therefore, it is possible to prevent heat from being transmitted to the surface of the sewing machine such as the outer wall of the arm or the cover and causing overheating. In addition, since no lubricating oil is required for cooling the drive device, the device configuration is simplified, and there is no possibility that the lubricating oil will adhere to one piece of cloth and cause it to become dirty.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a sewing machine according to an embodiment of the present invention, and FIG. 2 is a plan view of the sewing machine. 1...Motor 2...Arm 3...Sewing machine 6...Cover 10...Sleeve

Claims (1)

[Scope of Claims] 1. An arm structure for a sewing machine in which a driving device is built into the arm, wherein a wall portion formed integrally with an outer wall of the arm is provided around the driving device, and a part of the wall portion is provided. 1. An arm structure for a sewing machine, characterized in that a cover is provided to cover the outer wall, and a cooling space is provided between the wall and the outer wall and between the wall and the cover to form a double structure.