JP3005327U - Lubricating oil supply device for rotary hook - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent excessive supply of lubricating oil to the rail groove of the outer hook. [Structure] An outer pot 2 is fixed to an upper end portion, and a lower end portion is immersed in a lubricating oil in an oil sump to form a lubricating oil supply passage 6 inside the rotary shaft 1, and the lubricating oil supply passage 6 is inserted into the lubricating oil supply passage 6. In a lubricating oil supply device for a rotary hook configured to supply the lubricating oil to the rail groove 4 of the outer hook 2, when the lubricating oil excessively enters the lubricating oil supply passage 6, the excessive amount of the lubricating oil enters the oil sump. The return communicating hole 17 for returning is formed in the rotating shaft 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lubricating oil supply device for a rotary hook in a sewing machine.

[0002]

[Prior art]

 In the rotary hook that rotates the outer hook containing the inner hook, the rail groove formed on the inner peripheral surface of the outer hook and the rail formed on the outer peripheral surface of the inner hook are fitted to drive the outer hook to rotate. The rail groove and the rail slide in contact with each other. Therefore, it is necessary to supply the lubricating oil to the sliding contact portion between these rail grooves and the rails to prevent wear, and the rotary hook for supplying the lubricating oil to the sliding contact portion between the rail grooves and the rails. One of the conventional examples of the lubricating oil supply device will be described with reference to FIGS. 2 and 3.

First, an outer pot 2 is integrally formed on an upper end of a rotary shaft 1 which is erected in a substantially vertical direction and is driven to rotate about a center line, and a lower end of the rotary shaft 1 has an oil sump ( It is immersed in lubricating oil inside (not shown). An inner hook 3 is detachably accommodated in the outer hook 2, and a ring-shaped rail groove 4 formed on the inner peripheral surface of the outer hook 2 and a ring-shaped groove formed on the outer peripheral surface of the inner hook 3. Rail 5 is slidably fitted.

A lubricating oil supply passage 6 is formed inside the rotary shaft 1 on the center line thereof, and an expanding portion 7 is formed at an upper end portion of the lubricating oil supply passage 6 and the expanding portion 7 is formed. The portion 7 and the rail groove 4 are communicated with each other by communication passages 8 and 9 formed in the outer pot 2. On the other hand, the lower end of the lubricating oil supply passage 6 is formed in a closed state. Further, a spiral lead groove 10 is formed on the outer periphery of the lower end side of the rotating shaft 1, and the upper end portion of the lead groove 10 and the lower end portion of the lubricating oil supply passage 6 are formed on the rotating shaft 1. It is communicated by a supply communication hole 11 formed in a direction orthogonal to the center line.

Next, a felt 12 is impregnated with the lubricating oil and sucked up in the lubricating oil supply passage 6, and an upper end portion of the felt 12 is press-fitted into a hole 14 formed in an oil supply screw 13. An oil supply screw 13 is screwed onto the upper end of the lubricating oil supply passage 6.

In such a configuration, the rotary shaft 1 is driven to rotate together with the outer pot 2 so that the lubricating oil in the oil reservoir rises along the lead groove 10, and the raised lubricating oil is pumped in the lead groove 10. By the action, the lubricating oil enters into the lubricating oil supply passage 6 through the supply communication hole 11. The lubricating oil that has entered the lubricating oil supply passage 6 soaks into the felt 12 and rises due to capillary action, and the lubricating oil that has risen to the upper end of the felt 12 is generated as the rotary shaft 1 rotates. Due to the centrifugal force, the holes 15 formed in the oil supply screw 13 and the communication passage 8 are moved to penetrate into the felt 16 in the communication passage 9, and then are fed from the tip of the communication passage 9 to the groove 4.

[0007]

[Problems to be solved by the device]

 In the conventional example shown in FIG. 2 and FIG. 3, the amount of lubricating oil supplied to the rail groove 4 may be in an excessive state, and the excessively supplied lubricating oil adheres to the cloth or thread during sewing work. Then, there is a drawback that the sewn product is soiled. Therefore, in order to prevent excessive supply of lubricating oil to the track groove 4, it has been conventionally practiced to provide a device for adjusting the amount of lubricating oil in the oil sump on the main body side of the sewing machine. Specifically, the flow passage cross-sectional area of the supply path for supplying the lubricating oil to the oil sump is varied. However, by providing such a device, the structure of the sewing machine itself becomes complicated and the adjusting operation thereof is complicated.

On the other hand, as disclosed in Japanese Utility Model Publication No. 3-27476, Japanese Patent Publication No. 3-71920, Japanese Utility Model Publication No. 5-17033, etc., the lower end portion of the lubricating oil supply passage formed in the rotary shaft is Immerse it directly in the lubricating oil in the oil sump, and form this lubricating oil supply passage in a taper shape that gradually expands upward, or form a spiral lead groove on the inner peripheral surface of this lubricating oil supply passage. There is also a lubricating oil supply device configured to achieve an appropriate amount of lubricating oil supply. However, in a rotary hook that employs such a lubricating oil supply device, it is difficult to form the lubricating oil supply passage in a tapered shape or to form a lead groove on the inner peripheral surface, resulting in high cost. ing.

[0009]

[Means for Solving the Problems]

 According to the present invention, an outer pot is fixed to an upper end portion, and a lower end portion is provided with a rotary shaft which is driven to rotate around a center line by being immersed in a lubricating oil in an oil sump, and the center line direction is provided inside the rotary shaft. A lubricating oil supply passage formed along the upper end and communicating with a rail groove formed on the inner peripheral surface of the outer pot, and a lubricating oil sucked up in the lubricating oil stored in the lubricating oil supply passage. The suction body, the spiral lead groove formed on the outer periphery of the lower end side of the rotary shaft, the upper end of the lead groove and the lower end of the lubricating oil supply path are communicated with each other, and the center of the rotary shaft is connected to the rotary shaft. In a lubricating oil supply device for a rotary hook having a supply communication hole formed in a direction orthogonal to the line, a return communication hole is formed from the lower end of the lubricating oil supply passage toward the lower end of the rotary shaft. I set it up.

[0010]

[Action]

 In the present invention, when the rotary shaft is driven to rotate about its center line, the lubricating oil in the oil sump rises along the lead groove, and the ascended lubricating oil enters the lubricating oil supply passage from the supply communication hole, Further, the oil is sucked up by the lubricating oil suction body in the lubricating oil supply path and rises, and is supplied to the rail groove of the outer pot. When excess lubricating oil enters the lubricating oil supply passage, the excess lubricating oil is returned to the oil sump through the return communication hole. Therefore, with a simple structure in which the return communication hole is added to the rotary shaft, excessive supply of lubricating oil to the track groove is prevented.

[0011]

【Example】

 An embodiment of the present invention will be described with reference to FIG. The same parts as those described in FIGS. 2 and 3 are designated by the same reference numerals, and the description thereof will be omitted. The structure of the rotary shaft 1 and the outer pot 2 integrally formed with the upper end of the rotary shaft 1 is similar to that of the conventional example, and the lower end of the rotary shaft 1 is immersed in lubricating oil in an oil sump (not shown).

From the lower end of the lubricating oil supply passage 6 formed inside the rotary shaft 1 toward the lower end of the rotary shaft 1, a return communication hole 17 is formed on the center line of the rotary shaft 1. Has been done.

In such a configuration, when the rotary shaft 1 is rotationally driven together with the outer pot 2, the lubricating oil in the oil sump rises along the lead groove 10, and the ascended lubricating oil is supplied to the supply communication hole. It enters from 11 into the lubricating oil supply path 6. The lubricating oil that has entered the lubricating oil supply passage 6 soaks into the felt 12 and rises due to a capillary phenomenon, and the lubricating oil that has risen to the upper end of the felt 12 moves through the holes 15 and the communicating passages 8 and the felt inside the communicating passages 9 16 and is supplied to the rail groove 4 from the tip of the communication passage 9.

Here, when an excessive amount of lubricating oil enters the lubricating oil supply passage 6, the excessive amount is returned from the return communication hole 17 into the oil sump. Therefore, it is possible to prevent excessive lubrication oil from being supplied to the track groove 4, and to prevent the sewn product from being soiled by the excessively supplied lubrication oil. In a sewing machine using this rotary hook, a device for adjusting the amount of lubricating oil in the oil sump to prevent excessive supply of lubricating oil to the rail groove 4 is not required, and the structure of the sewing machine itself is simplified. It also eliminates the complexity of adjustment operations.

The rotary hook of the present embodiment can be used in place of the conventional rotary hook that employs the lubricating oil supply device shown in FIGS. It can also be used in place of a rotary hook that employs a lubricating oil supply device in which the inner peripheral surface of the lubricating oil supply passage formed in Figure 2 is tapered or a lead groove is formed.

[0016]

[Effect of device]

 According to the present invention, as described above, the outer hook is fixed to the upper end portion, and the lower end portion is provided with the rotary shaft that is driven to rotate around the center line by being immersed in the lubricating oil in the oil sump. A lubricating oil supply passage formed along the center line direction and having an upper end communicating with a rail groove formed on the inner peripheral surface of the outer pot, and a lubricating oil stored in the lubricating oil supply passage. The lubricating oil suction body, the spiral lead groove formed on the outer periphery of the lower end side of the rotating shaft, the upper end portion of the lead groove and the lower end portion of the lubricating oil supply passage, and A lubricating oil supply device for a rotary hook having a supply communication hole formed in the rotary shaft in a direction orthogonal to a center line of the rotary shaft from a lower end portion of the lubricating oil supply passage toward a lower end portion of the rotary shaft. Since a return communication hole is drilled, the pumping action of the lead groove creates a lubricating oil supply passage. If the lubricating oil that has entered is excessive, the excess can be returned from the return communication hole into the oil sump, and therefore a simple structure of adding a return communication hole to the rotating shaft It is possible to prevent excessive supply of lubricating oil to the track groove, and to prevent sewn products from being contaminated by the excessive supply of lubricating oil, and also to prevent excessive supply of lubricant oil to the track groove. In order to prevent this, it is possible to improve the handleability of the sewing machine without the need for the operation of adjusting the amount of lubricating oil supplied to the oil sump, which was conventionally done.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of the present invention.

FIG. 2 is a front view showing a conventional example.

FIG. 3 is a vertical sectional front view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotating shaft 2 outer hook 4 rail groove 6 lubricating oil supply path 10 lead groove 11 communication hole for supply 12 lubricating oil suction body 17 communication hole for return

Claims (1)

[Scope of utility model registration request] 1. A rotary shaft having an outer hook fixed to an upper end thereof and having a lower end immersed in a lubricating oil in an oil sump and driven to rotate around a center line, the inside of the rotary shaft having a center line direction. And a lubricating oil supply passage having an upper end communicating with a rail groove formed on the inner peripheral surface of the outer pot, and a lubricating oil suction pipe for sucking up the lubricating oil stored in the lubricating oil supply passage. The upper body, a spiral lead groove formed on the outer circumference of the lower end side of the rotating shaft, the upper end of the lead groove and the lower end of the lubricating oil supply path are communicated with each other, and the center line of the rotating shaft is provided. In a lubricating oil supply device for a rotary hook having a supply communication hole formed in a direction orthogonal to each other, a return communication hole is formed from the lower end of the lubricating oil supply path toward the lower end of the rotary shaft. A rotary hook lubricating oil supply device.