CN1321237C - sewing machine - Google Patents

Abstract

An industrial sewing machine has a sealed lubricating chamber 36 containing lubricating oil 38, and air discharge devices 46, 52 for communicating air in the lubricating chamber with air outside the sewing machine. The air discharge device has a hollow cylindrical portion 50, 56 forming an air hole opening in the lubrication chamber, the cylindrical portion projecting into the lubrication chamber, and an open groove 50B, 56B formed in the axial direction at the circumferential portion thereof. The air exhaust part of the sewing machine does not make the lubricating oil fly to the outside from the closed space and is difficult to be blocked.

Description

sewing machine

technical field

The invention relates to a sewing machine, in particular to an air discharge structure of an industrial sewing machine with a sealed lubricating chamber storing lubricating oil.

Background technique

In industrial sewing machines operating at high speeds, lubricating oil has conventionally been used to prevent seizure of movable parts such as gears and cams and to prevent heat generation. However, it is not desirable for the lubricating oil to come into contact with the upper and lower threads inside the sewing machine body, and it is also not desirable for the lubricating oil to leak from the inside of the sewing machine body to the outside to contact the sewing material or stick to the operator's work clothes. Various countermeasures have been taken to prevent such oily sewing materials and work clothes.

As one of the countermeasures, a closed lubricating chamber is formed in the sewing machine frame, and a position that must be lubricated is arranged in the lubricating chamber as much as possible, and such a sewing machine is known. An example of such a sewing machine will be described with reference to FIGS. 6 to 8 . The upper shaft 2 of this sewing machine is driven to rotate by an unshown sewing machine motor, so that the needle bar 3 moves up and down. 4 is an up and down conveying shaft, which moves the cloth feeding teeth (not shown) in the up and down direction. 6 is a horizontal conveying shaft, which makes the cloth feeding teeth move in the horizontal direction. 8 is thread shuttle shaft, fixes the thread shuttle not shown in figure, makes thread shuttle and needle bar 3 synchronous rotations.

Sprockets 10 and 12 are respectively fixed on the upper shaft 2 and the upper and lower conveying shafts 4 , and these 2 sprockets transmit the rotary motion of the upper shaft 2 to the upper and lower conveying shafts 4 through the timing belt 14 . The upper and lower conveyance shafts 4 are rotatably supported by bearings 18 attached to the partition walls 16A, 16B of the frame 16 .

A horizontal conveyance cam 20 is fixed to the vertical conveyance shaft 4, and a vertical conveyance cam is fixed to the front end side (lower in the drawing), not shown. The horizontal conveying cam 20 drives the horizontal conveying shaft 6 through a connecting rod 22 , a cloth feeding regulator 24 and a cloth feeding rod 26 . Moreover, a gear 28 is fixed to the upper and lower conveying shaft 4, and the thread hook shaft 8 is rotated by a gear 30 engaged with it. The hook shaft 8 is rotatably supported by a bearing 32 mounted on the partition wall 16B of the frame 16 .

The cloth feed adjuster 24 has a shaft 24A rotatably supported by the partition walls 16A and 16B of the frame 16 , and the horizontal feed shaft 6 is rotatably supported by the partition wall 16B of the frame 16 by bearings not shown.

Each of the above-mentioned gears 28, 30, horizontal cam 20, cloth feed adjuster 24, bearings 18, 32, etc., must be lubricated because any of them has a sliding portion for high-speed operation. Therefore, a lubricating chamber 36 surrounded by the frames 16 , 16A, 16B and the bottom guard 34 is formed, and various components and lubricating oil 38 are accommodated in the lubricating chamber 36 . In the illustrated example, lubricating oil 38 capable of soaking a part of the gear 28 is provided, and the rotation of the gear 28 stirs the oil to scatter in the lubricating chamber 36 to supply oil to each component.

Sealing elements such as sealing rings 40, 42 are arranged on each through hole formed on the partition wall 16A, 16B of the frame 16 for fixing the upper and lower conveying shaft 4 and the thread hook shaft 8, so that the lubricating oil stirred by the gear 28 will not Leak to other spaces in the frame 16. Also to support the shaft 24A of the horizontal conveying shaft 6 and the cloth feed regulator 24, sealing elements such as sealing rings or sealing gaskets not shown are provided on each through hole formed on the partition wall 16A, 16B of the frame 16. .

Form the lubricating chamber 36 that is sealed in frame 16 like this, when lubricating oil 38 is housed inside it, if the internal temperature of lubricating chamber 36 becomes high temperature than other spaces in frame 16, due to expansion, internal pressure can become high. Even if the through holes formed on the partition walls 16A, 16B and the gaps between the shafts 4, 6, 8, 24 are provided with sealing components such as oil seal rings or gaskets, if the internal and external pressure difference is too high, the lubricating oil 38 will It leaks to other spaces in the rack 16 beyond the sealing portion. The generation of this internal and external pressure difference, in addition to the thermal expansion due to the heating of the sliding part during the operation of the sewing machine, also produces a pressure difference due to the internal and external temperature difference when the sewing machine stops running.

In order not to generate such a pressure difference, an air discharge member 44 for communicating the lubricating chamber 36 with the air outside the sewing machine is provided. This air discharge part 44 is formed on the hole 44A that offers on the lubricating chamber 36 and the small hole 44B that is connected with this hole 44A and communicates with outside air, and it is installed on the frame 16.

If the inner diameter of the hole 44A leading to the lubricating chamber 36 of the above-mentioned air discharge member 44 is too large, the lubricating oil volatilized and floating in the lubricating chamber 36 will be squeezed out due to the pressure difference between the inside and the outside and enter the hole in large quantities, which is easy to It flies out from the small hole 44B. Conversely, if the inner diameter of the hole 44A is too small, lubricating oil will adhere due to surface tension, and the lubricating oil will move to the small hole 44B due to the pressure difference, thereby clogging the hole 44B.

In particular, the lubricating oil is scattered by the gear 28 in the aforementioned lubricating chamber 36 during operation of the sewing machine. Therefore, if the inner diameter of the hole 44A leading to the lubricating chamber 36 of the above-mentioned air discharge member 44 is too large, the lubricating oil that is easily scattered with a violent tendency will enter the hole, and then flow outward from the small hole 44B with a violent tendency. The phenomenon of flying out. Conversely, if the inner diameter of the hole 44A is too small, lubricating oil will adhere due to surface tension, and the hole will be easily blocked.

Contents of the invention

It is therefore an object of the present invention to provide an industrial sewing machine which does not cause lubricating oil to fly from a closed space to the outside and which has an air discharge member which is hardly clogged.

In order to achieve the above object, according to the sewing machine of the present invention, there is a closed lubricating chamber filled with lubricating oil, and a hollow cylindrical part forming an open air hole in the lubricating chamber, so that the air in the lubricating chamber can be connected to the air outside the sewing machine. A connected discharge air device; characterized in that, the discharge air device forms an open groove along the axial direction on the circumferential portion of the cylindrical portion.

Preferably, the opening slot is arranged vertically downward.

Preferably, the cylindrical portion protrudes into the lubricating chamber.

For example, the air discharge device has a mounting portion mounted on the frame, and the mounting portion has an air hole of the cylindrical portion, an air hole opening arbitrarily outside the sewing machine, and an insertion hole capable of inserting the cylindrical portion. hole, and the cylindrical part can be freely detachably inserted into the mounting part.

Alternatively, the air discharge device has a mounting part installed on the frame, the mounting part has the air hole of the cylindrical part and the air hole opening arbitrarily outside the sewing machine, the cylindrical part and the mounting part Formed in one piece.

Description of drawings

Hereinafter, a brief description will be given of the drawings and their reference numerals.

Fig. 1 is a bottom view of a sewing machine according to Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view along line A-A of FIG. 1 .

Fig. 3 is an exploded perspective view of the air discharge device of the sewing machine according to Embodiment 1 of the present invention.

Fig. 4 is a perspective view of the cylindrical part of the air discharge device in Fig. 3 before assembly.

Fig. 5 is a perspective view of an air discharge device for a sewing machine according to Embodiment 2 of the present invention.

Fig. 6 is a bottom view of a conventional sewing machine.

Fig. 7 is an A-A sectional view of the sewing machine in Fig. 6 .

Fig. 8 is a sectional front view of the sewing machine in Fig. 6 .

In the figure: 36—lubricating chamber, 46, 52—air discharge device, 48, 54—installation part, 48A—insertion hole, 48B, 54A—small hole (air hole), 50, 56—cylindrical part, 50A, 56A - through hole (air hole), 50B, 56B - open slot.

Detailed ways

Example

Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 4 . The same components as those in the conventional examples shown in FIGS. 6 to 8 are denoted by the same symbols. This sewing machine is different from the previous sewing machine only in the air discharge device, and other parts are the same, so the explanation of this part is omitted.

The air discharge device 46 is composed of a mounting portion 48 mounted on the frame 16 and a cylindrical portion 50 protruding from the sealed lubricating chamber 36 . The mounting portion 48 is formed of an insertion hole 48A formed on the lubricating chamber 36 side and a small hole (air hole) 48B opened outward in the same structure as the conventional air discharge device 44 . The cylindrical portion 50 is made of elastic material such as metal or synthetic resin, has a hollow through hole (air hole) 50A, and has a substantially cylindrical shape, and its peripheral portion is cut off in the axial direction to form an open groove 50B. . The cylindrical portion 50 is inserted into the insertion hole 48A of the mounting portion 48, and the air in the lubricating chamber 36 communicates with the air outside the sewing machine through the through hole 50A and the small hole 48B.

In Fig. 3 and Fig. 4, the outer diameter R of the cylindrical part 50 before insertion is larger than the inner diameter r of the insertion hole 48A of the mounting part 48, and the opening groove 50B is narrowed by elastic deformation during insertion, and fitted and fixed in the insertion hole 48A. The longitudinal dimension of the cylindrical portion 50 is larger than the depth of the insertion hole 48A of the mounting portion 48 , so when inserted into the insertion hole 48A and mounted on the sewing machine frame 16 , the cylindrical portion 50 protrudes into the lubricating chamber 36 .

According to the air discharge device 46 of this embodiment, since the cylindrical portion 50 is formed with the open groove 50B, the oil film is broken by the open groove 50B to reduce its surface tension, so the lubricating oil 38 hardly adheres. Therefore, even if the through hole 50A of the cylindrical portion 50 is made small, it is difficult to be blocked. Then, since the through hole 50A can be made small, the lubricating oil stirred and scattered by the gear 28 during operation of the sewing machine is also difficult to enter the through hole 50A, so it will not fly out from the small hole 48B of the mounting part 48. Phenomenon.

Moreover, according to the air discharge device 46 of the present embodiment, since the cylindrical portion 50 protruding from the lubricating chamber 36 is provided, the lubricating oil stirred and scattered by the gear 28 is difficult to reach the small hole 48B of the mounting portion 48, so it will not The phenomenon of flying to the outside occurs.

Moreover, as shown in FIG. 2 , if the opening groove 50B is provided facing downward, the lubricating oil entering the through hole 50A will flow downward from the opening groove 50B, thereby further preventing oil clogging.

Furthermore, due to the elastic deformation of the formed open groove 50B during assembly, the tolerance between the inner diameter r of the insertion hole 48A of the attachment portion 48 and the outer diameter R of the cylindrical portion 50 can be increased. Thus, according to the present embodiment, the exhaust air device 46 can achieve a large effect with a simple configuration.

Next, Embodiment 2 of the present invention will be described with reference to FIG. 5 . This sewing machine is different from the previous sewing machine only in the air discharge device, and other parts are the same, so the explanation of this part is omitted. The exhaust air device 52 of the second embodiment is a structure in which the mounting part 48 and the cylindrical part 50 of the first embodiment are integrally formed, and a small hole (air hole) 54A is formed on the mounting part 54, and a small hole (air hole) 54A is formed on the cylindrical part 56. There are through holes (air holes) 56A, and opening grooves 56B are formed in the axial direction of the peripheral portion thereof. The air in the lubricating chamber 36 communicates with the air outside the sewing machine through the through hole 56A and the small hole 54A. When installing on the sewing machine frame 16, it is preferable to make the small hole 54A face upward and the opening groove 56B face downward.

The air discharge device 52 of the present embodiment can achieve substantially the same effect as the air discharge device 46 of the first embodiment. The oil film is broken through the opening groove 56B, making it difficult for lubricating oil to adhere, so the hole is not easily blocked. Since the through hole 56A is made small, it is difficult for the lubricating oil stirred and scattered by the gear 28 to enter the through hole 56A, so that the phenomenon of flying out of the small hole 54A does not occur.

Moreover, since the cylindrical portion 56 protrudes into the lubricating chamber 36, the lubricating oil stirred and scattered by the gear 28 hardly reaches the small hole 48B of the mounting portion 48, so the phenomenon of flying outside does not occur.

Moreover, since the opening groove 56B is provided facing downward, the lubricating oil entering the through hole 56A will flow downward from the opening groove 56B, thereby further preventing oil clogging.

According to the air discharge device 52 of the present embodiment, a large effect can be achieved with a simple structure, and in particular, compared with the air discharge device 46 of Embodiment 1, it is composed of a single component, so that the sewing machine assembly operation can be made quickly and easily.

According to the sewing machine of the present invention, the air discharge device that communicates the air in the closed space containing the lubricating oil with the air outside the sewing machine has a hollow cylindrical portion that forms an air hole that opens in the lubricating chamber. Indoor, and an open groove along the axial direction is formed on its circumference, so the lubricating oil entering the air hole of the cylindrical part breaks the oil film through the open groove, reduces the surface tension, and makes it difficult for the oil to adhere. Therefore, even if the air hole of the cylindrical part is made small, it is not easy to be blocked. Furthermore, since the air hole is made small, it is difficult for the lubricating oil to enter the air hole, so the phenomenon that the oil flies out to the outside does not occur. Furthermore, since the cylindrical portion protrudes into the lubricating chamber, the lubricating oil does not fly out from the lubricating chamber.

For this sewing machine, when there is at least one sliding part in the lubricating chamber, high temperature will be generated along with the operation of the sewing machine, so the present invention has a special effect.

If the opening groove of the cylindrical part is arranged vertically downward, the lubricating oil that has entered the air hole will flow downward from the opening groove, which has a further effect on oil blocking the hole.

As the exhaust air device, there is an installation part installed on the sewing machine frame, and the installation part has the air hole of the cylindrical part and any air hole opened outside the sewing machine and the insertion hole that can be inserted into the cylindrical part; if the cylindrical part is able to If the mounting portion is detachably inserted, a large effect can be achieved with a simple structure. Furthermore, the cylindrical portion having an optimum length can be selected according to the predetermined number of operations of the sewing machine to be used and the space of the lubricating chamber.

As the air discharge device, there is a mounting part installed on the sewing machine frame, and the mounting part has a cylindrical part air hole and any air holes opened to the outside of the sewing machine. If the cylindrical part is integrally formed with the mounting part, then it can A large effect is achieved with a simple structure, especially since it is constituted by a single component, the assembling operation of the sewing machine can be quickly and easily performed.

Claims (5)

1. A sewing machine having a closed lubricating chamber filled with lubricating oil, a hollow cylindrical portion forming an open air hole in the lubricating chamber, and an air discharge device that can communicate the air in the lubricating chamber with the outside air of the sewing machine ; It is characterized in that, in the air discharge device, an opening groove along the axial direction is formed on the circumferential portion of the cylindrical portion. 2. The sewing machine according to claim 1, wherein said opening groove is arranged vertically downward. 3. The sewing machine according to claim 1, wherein the cylindrical portion protrudes into the lubricating chamber. 4. The sewing machine according to claim 1 or 2, wherein the air discharge device has a mounting portion installed on the sewing machine frame, and the mounting portion has the air hole of the cylindrical portion and the air hole outside the sewing machine. An air hole opened arbitrarily and an insertion hole for inserting the cylindrical part, and the cylindrical part is detachably inserted into the mounting part. 5. According to the described sewing machine of claim 1 or 2, it is characterized in that, the said exhaust air device has a mounting part installed on the sewing machine frame, and the mounting part has the air hole of the cylindrical part and any external hole of the sewing machine. The air hole is opened, and the cylindrical part has a structure integrally formed with the mounting part.

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