JPH045991A - Oil refilling/draining device for sewing machine - Google Patents

Abstract

PURPOSE:To always stably perform the refilling and collection of oil by providing a negative pressure generator which sucks the oil in a drainage tube by negative pressure generated by the ejecting function of a compression air current as supplying compressed air from an air supply device to an oil tank and introduces it to the oil tank. CONSTITUTION:When a motor 19 is driven and also, an electromagnetic valve 21 is operated, the compressed air PA from a compressor 20 is supplied to the oil tank 14 via and air supply tube 23, the electromagnetic valve 21, and the negative pressure generator 14. Therefore, lubricant oil 0 in the oil tank 13 is supplied to the plural rotary sliding parts of each bearing member 7, respectively via an oil refilling tube 11 according to the increment of pressure in the oil tank by the air from the negative pressure generator 17. Meanwhile, the oil in the drainage tube 12 is sucked by the ejecting function of the negative pressure generator 14, and the oil supplied as the lubricant staying in an oil receiver pan 8 is introduced to the oil tank 13. Thereby, the oil supplied as the lubricant is collected in the oil tank 13 by the negative pressure generated by the ejecting function of the negative pressure generator 14, therefore, the refilling quantity of oil can be always stably secured.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an oil supply/drainage device for a sewing machine, and in particular, it supplies lubricating oil to rotating sliding parts of a mechanical mechanism using compressed air, and also uses oil supplied for lubrication. Relating to things that are collected.

[Prior art]

In general, electric sewing machines used for industrial purposes have multiple rotations of mechanical drive mechanisms such as the needle bar vertical movement mechanism and cloth feed mechanism driven by the sewing machine motor to enable continuous high-speed sewing operation. Lubricating oil is supplied to the sliding parts through the oil supply pipe to lubricate and cool the sliding parts of the drive system, and there is also a built-in oil supply and drainage device to collect the oil used for lubrication. There is. In this oil supply/drainage system, the rotational force of the sewing machine motor is transmitted to the gear pump (mechanical pump) installed in the machine frame of the sewing machine via a pump drive system including gears. Lubricating oil stored in an oil pan provided in the lubricating section is supplied to each of the plurality of sliding parts, and is also collected into the oil pan from an oil reservoir at the rear of the lubricating section.

By the way, in Japanese Patent Publication No. 32-5973, lubricating oil is supplied to the sliding parts by an oil pump through an oil supply pipe, and is also generated by a jet pump (negative pressure generator) installed in the middle of the oil supply pipe. An oil supply/drainage device for a sewing machine is described in which oil in an oil reservoir is collected into an oil pan using negative pressure.

[Problem to be solved by the invention]

In conventional oil supply and drainage systems, the rotation speed of the sewing machine motor, that is, the rotation speed of the gear pump, which is proportional to the amount of oil supplied, becomes slow, especially when the right edge of the workpiece fabric is thick or when the operator is not skilled in operating the sewing machine. Therefore, there are problems such as not being able to sufficiently supply oil to each sliding part, and when the sewing machine motor is operated at high speed, the noise of the pump drive system increases.

Furthermore, when applying this conventional oil supply/drainage device or the oil supply/drainage device described in Japanese Patent Publication No. 32-5973 to a large electric sewing machine, the number of sliding parts that require oil supply increases. This increases the amount of oil supplied to each sliding part and requires a large oil pump, which poses a problem in that it is very disadvantageous in terms of space and cost.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sewing machine oil supply/drainage device that can always ensure stable oil supply and oil recovery and can be universally applied to various sewing machines.

[Failure to solve the problem]

The oil supply and discharge device for a sewing machine according to the present invention is an oil supply and discharge device for a sewing machine that supplies and discharges lubricant oil to a plurality of rotating sliding parts of a mechanical mechanism driven by a sewing machine motor. an oil tank, an oil supply pipe for supplying oil in the oil tank to multiple rotating sliding parts, an oil drain pipe for collecting oil supplied from the oil supply pipe and used for lubrication into the oil tank, and a compression pipe. An air supply device that supplies air is connected to the air supply device, an oil tank, and an oil drain pipe, and while supplying compressed air from the air supply device to the oil tank, the air is discharged using negative pressure generated by the ejecting action of the compressed air flow. It is equipped with a negative pressure generator that sucks oil from the oil pipe and introduces it into the oil tank.

[Effect]

In the oil supply and drainage device for a sewing machine according to the present invention, the negative pressure generator connected to the air supply device, the oil tank, and the oil drain pipe supplies compressed air from the air supply device to a sealed oil containing lubricating oil. While supplying the oil into the tank, the negative pressure generated by the ejecting action of the compressed air flow sucks oil from the oil drain pipe and introduces it into the oil tank. Therefore, since the oil tank is sealed, the air pressure in the oil tank increases, and the lubricating oil in the oil tank is supplied to the multiple rotating sliding parts of the mechanical mechanism through the oil supply pipe, and is also supplied for lubrication. The oil is collected by negative pressure into the oil tank via the oil drain pipe.

〔Effect of the invention〕

According to the oil supply/drainage device for a sewing machine according to the present invention, by providing an oil tank, an air supply device, a negative pressure generator, etc., the lubricating oil in the oil tank is distributed to each of the plurality of rotating and sliding parts by compressed air. Since the oil supplied and used for lubrication is collected into the oil tank by the negative and positive changes, a stable amount of oil supply can always be ensured regardless of the rotation speed of the sewing machine motor. Furthermore, since the amount of oil supplied and the amount of oil recovered can be changed by simply adjusting the amount of compressed air in the air supply device, the present invention can be universally applied to various sewing machines regardless of the size of the sewing machine.

Furthermore, when using an air supply source installed within the factory, noise from the oil supply and drainage device can be reduced as much as possible.

Furthermore, when this oil supply/drainage device is provided outside the sewing machine, it is possible to supply and drain oil to a plurality of sewing machines.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

This embodiment is a case where the present invention is applied to an oil supply and discharge device for supplying and discharging lubricating oil to a large industrial electric sewing machine.

First, electric sewing machine 1 will be explained based on FIG. 1.

Inside the arm section 2 is a needle bar that drives the needle bar up and down reciprocatingly.
- Mechanical mechanisms such as a lower drive mechanism, a needle bar swing drive mechanism that swings left and right, and a take-up mechanism that drives the take-up reciprocating up and down are incorporated, and the hook drive mechanism and feed dog are installed in the bed section 3. A feed dog vertical movement mechanism that reciprocates up and down and a feed dog back and forth movement mechanism that reciprocates back and forth are incorporated, and these mechanical mechanisms are respectively driven by sewing machine motors (not shown) via an upper shaft 5 and a lower shaft 6. Driven.

These upper shafts 5 and lower shafts 6 are rotatably supported by multiple bearings 7, and these upper shafts 5 and lower shafts 6 are designed to withstand continuous high-speed rotation without seizing. Axis 5
The rotating and sliding parts between the bearings and the lower shaft 6 and the member 7 are each supplied with lubricating oil 0 through an oil supply pipe 11. Although not shown, the lubricating oil O is also supplied to each of the sliding parts of the drive system including link mechanisms and the like through the oil supply pipe 11.

Further, the head 4 and the head portion 3 are provided with a plurality of oil reservoir plates 8 for collecting oil supplied from the oil supply pipe 11 for lubrication.

Next, regarding the oil supply/drainage device 10 that is provided outside the sewing machine 1 and supplies lubricating oil O to the plurality of rotating and sliding parts of the electric sewing machine 1, and collects the lubricated oil into the oil tank 13. , will be explained based on FIG.

The plurality of bearings include an oil supply pipe 11 whose one end is connected to the member 7.
The other end is connected to the lower end of a cylindrical and sealed oil tank 13 placed on the floor, for example. This oil tank 13 contains lubricating oil O for lubrication. Further, the other end of the oil drain pipe 12 connected to the inside of the oil reservoir pan 8 is connected to a suction port 16 of a negative pressure generator 14 .

Compressed air PA from an air supply device 18 consisting of a motor 19 and a compressor 20 driven by the motor 19
(for example, about 5 kg/cnt) is supplied to the air supply port 15 of the negative pressure generator 14 via the air supply pipe 23 and the electromagnetic valve 21. Further, an exhaust port 17 of the negative pressure generator 14 is connected to the oil tank 13 via an air supply pipe 24. Further, a side wall near the upper end of the oil tank 13 is provided to keep the air pressure inside the oil tank 13 constant (for example, about 2 to 3 k).
Relief valve 2 for holding at g/c+ff)
2 is provided.

Here, the ejecting action of the negative pressure generator 14 will be briefly explained based on FIG.

The compressed air PA supplied to the air supply port 15 is supplied to the nozzle 2
5, it becomes a high-speed air jet and exits the exhaust port 17.
is exhausted from. Due to the ejecting action of the air jet at this time, a negative pressure suction force acts on the suction port 16, and the air and oil in the oil drain pipe 12 are suctioned.

Next, the operation of the oil supply/drainage device 10 configured as described above will be explained.

When the motor 19 is driven and the electromagnetic valve 21 is operated, the compressed air PA from the compressor 20 is supplied to the air supply pipe 2.
The oil is supplied into the oil tank 13 via the electromagnetic valve 3, the electromagnetic valve 21, and the negative pressure generator 14.

Therefore, as the pressure in the oil tank 13 increases due to the air from the negative pressure generator 7, the lubricating oil O in the oil tank 13 is supplied to each bearing through the oil supply pipe 11. The rotating and sliding parts are each supplied with oil.

On the other hand, the oil in the oil drain pipe 12 is sucked by the negative pressure generated by the ejecting action of the negative pressure generator 14, and the oil in the oil reservoir pan 8
The lubricating oil accumulated in the oil tank 13 is introduced into the oil tank 13. Note that the maximum pressure within the oil tank 13 is always set constant by the relief valve 22.

The electromagnetic valve 21 may be opened as the sewing machine motor is driven, or may be opened and closed repeatedly at predetermined time intervals while the sewing machine motor is driven.

As explained above, the lubricating oil O in the oil tank 13 is supplied to each of the plurality of sliding parts by the compressed air PA,
Further, since the oil supplied for lubrication is recovered into the oil tank 13 under the negative pressure generated by the ejecting action of the negative pressure generator 14, a stable amount of oil supply can be ensured at all times. Moreover, by simply changing the rotation speed of the motor 19 and adjusting the amount of compressed air from the compressor 20, the amount of oil supplied and the amount of oil recovered can be changed, making it universally applicable to various sewing machines regardless of their size. can be converted and applied.

Further, since this oil supply/drainage device IO is provided outside the sewing machine 1, one oil supply/drainage device 10 can supply and drain oil to a plurality of sewing machines 1. However, it is also possible that this oil supply/drainage device 10 is incorporated inside the sewing machine 1.

In addition, if there is an air supply source in the factory where this electric sewing machine 1 is installed, compressed air from that air supply source may be used. In this case, the noise from the oil supply/drainage device 10 can be reduced as much as possible.

It goes without saying that the present invention can be applied to an oil supply/drainage device for supplying and recovering lubricating/oil to a sewing machine equipped with a large number of link mechanisms and mechanical mechanisms.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall configuration diagram of an oil supply/drainage device for a sewing machine, and FIG. 2 is a sectional view of a negative pressure generator. ■...Electric sewing machine, 7...Bearing is a component, 10...
Oil supply and drain device, 11...oil supply pipe, 12 oil drain pipe,
13...Oil tank, 14...Negative pressure generator,
18...Air supply device, 19...Motor, 2
0...Compressor, ○...Lubricating oil. Patent applicant: Brother Industries, Ltd.

Claims (1)

[Claims] (1) In a sewing machine oil supply/drainage device that supplies and discharges lubricating oil to a plurality of rotating sliding parts of a mechanical mechanism driven by a sewing machine motor, a sealed oil tank containing the lubricating oil and an inside of the oil tank are provided. an oil supply pipe for supplying oil to the plurality of rotating sliding parts, an oil drain pipe for collecting the oil supplied from the oil supply pipe and provided for lubrication into an oil tank, and an air supply device for supplying compressed air. and is connected to the air supply device, the oil tank, and the oil drain pipe, and while supplying compressed air from the air supply device to the oil tank, sucks oil in the oil drain pipe with negative pressure generated by the ejecting action of the compressed air flow. An oil supply and drainage device for a sewing machine, comprising: a negative pressure generator that introduces oil into an oil tank.