JPH0520305Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] This invention relates to a lubricating device for a sewing machine.

[Prior Art] Conventionally, a device called a forced lubrication system is known as this type of device. In this method, an oil pan is installed below the bed of the sewing machine to store lubricating oil, and a gear pump rotated by the main shaft of the sewing machine sucks the lubricating oil and supplies it to oil supply parts such as bearings in the arm of the sewing machine. It is. The surplus of the lubricating oil supplied to the oil supply section is returned to the oil tank.

[Problems to be solved by the invention] In this forced lubrication system, in order to return excess lubricating oil to the oil pan, it is necessary to supply lubricating oil to each oil supply part under pressure. The problem is that the pump needs to be large and powerful, making it expensive. Furthermore, when lubricating oil is supplied under pressure to each oil supply section during operation of the sewing machine, there is a problem in that the pressure may cause oil to leak from the oil supply sections. Furthermore, a large amount of lubricating oil is required to constantly circulate the lubricating oil within the machine frame, which poses a problem in that the running cost of the sewing machine increases. In addition, since the lubricating oil is stored in the oil pan, when the machine frame of the sewing machine is tilted, the lubricating oil inside the machine frame may leak out onto the work table through the inner wall of the machine frame, or if the sewing machine is not used in a sewing factory. There are also problems such as the need to move the lubricating oil quietly in order to prevent lubricating oil from leaking out.

[Purpose of the invention] This invention was devised to solve the above-mentioned problems, and its purpose is to reduce the amount of lubricating oil required and to prevent leakage of lubricating oil from the outside even when the sewing machine is running or when the machine frame is tilted. To provide an oil supply device for a sewing machine that does not leak lubricating oil, is inexpensive, and is easy to handle.

[Means for Solving the Problems and Their Effects] In order to achieve this object, the oil supply device for a sewing machine of the present invention includes a closed type oil tank provided in the arm of the sewing machine and containing lubricating oil; a main shaft rotatably supported by a bearing provided in the arm and operatively connected to the prime mover; a spiral groove formed in either one of the bearing and the main shaft and supplying lubricating oil in the oil tank to the oil reservoir by the rotational action of the main shaft within the bearing; In order to keep the amount of lubricating oil supplied to the oil sump constant, it has an oil ring pipe connected from the oil sump to the oil tank, and an oil supply pipe connected from the oil sump to the oil supply part of the sewing machine. The lubricating oil is circulated between the oil tank and the oil sump using a spiral groove, a ring oil pipe, and the lubricating oil stored in the oil sump is supplied to each oil supply section.

[Embodiment] Hereinafter, the present invention will be described in detail with reference to the drawings showing an embodiment of the present invention in a two-needle lockstitch sewing machine.

A bearing metal 2 is screwed into the arm 1 of the two-needle sewing machine, and a main shaft 3 is rotatably supported on the bearing metal 2. 2 and rotated clockwise in FIG. The bearing metal 2 is formed with a support hole 4 for supporting the main shaft 3, and a large diameter oil sump hole 5 following the support hole 4. A helical groove 6 is bored in the inner circumferential surface of the support hole 4, and has a pumping effect by cooperating with the rotation of the main shaft 3.
A lubricating oil suction hole 7 formed in the bearing metal 2 is connected to one end of the spiral groove 6. This lubricating oil suction hole 7 is connected to the bottom of an oil tank 8 located below the bearing metal 2 in the arm 1 and to a pipe 9.
The lubricating oil in the oil tank 8 is guided to the spiral groove 6. On the other hand, the other end of the spiral groove 6 is connected to the oil sump hole 5, and as the main shaft 3 rotates clockwise in FIG. It is discharged and supplied inside. An oil seal 10 is fixed to the open end of the oil sump hole 5, and the oil seal 10 is fixed to the open end of the oil sump hole 5.
This prevents lubricating oil from leaking through the

A first lubricating oil reducing hole 11 is bored in the bearing metal 2 along one horizontal axis, and the reducing hole 11 is connected to the oil sump hole 5 and is connected to the oil sump hole 5.
It is located near the bottom wall of. This reduction hole 11 is connected to the oil tank 8 via a first oil ring pipe 12.
The lubricating oil supplied into the oil reservoir hole 5 is returned to the oil tank 8. At a position above the first reducing hole 11 of the bearing metal 2, a lubricating oil reducing hole 13 having a larger diameter than the reducing hole 11 is bored so as to extend along a horizontal axis. 13 is connected to the oil sump hole 5, as shown in FIG. This reduction hole 1
3 is connected to the upper part of the oil tank 8 via a second oil ring pipe 14, and the amount of lubricating oil in the ring is larger than the amount of lubricating oil in the first reducing hole 11 and the first oil ring pipe 12. It is returned to the oil tank 8.
When the main shaft rotates at low speed, the lubricating oil supplied to the oil sump hole 5 in cooperation with the helical groove 6 flows through the first reducing hole 11 and the second reducing hole 13 as shown in FIG. The amount is maintained at a constant level approximately in the middle of . On the other hand, when the main shaft rotates at high speed, the lubricating oil is maintained at a constant level at the level of the second reducing hole 13, as shown in FIG. The lowest part of the bottom wall of the oil sump hole 5 of the bearing metal 2 and the first lubricating oil return hole 11
A pot oil supply hole 15 is opened at a level between the
This hook oil supply hole 15 is connected to the hook 2 via the hook oil supply pipe 16.
Lubricating oil is supplied to the lower end surface of a hook shaft (not shown) of a horizontal hook supported by a hook base (not shown) of a full-needle sewing machine. This pot oil supply hole 15 is formed smaller than the diameter of the first lubricating oil return hole 11 in order to minimize the volume of lubricating oil existing between the oil sump hole 5 and the hook shaft. Based on this difference in diameter, while the main shaft 3 is rotating, the lubricating oil supplied to the oil sump hole 5 is returned to the oil tank 8, and a portion of the lubricating oil is returned to the oil tank 8 by the amount consumed in the pot. Pot oil supply hole 1
Infiltrate into 5. Furthermore, since the diameter of the hook oil supply hole 15 and the hook oil supply pipe 16 is small, a wire 17 is inserted therein to facilitate the entry of lubricating oil. On the other hand, a hole 18 that opens to the oil sump hole 5 and extends parallel to the main shaft 3 is bored in the upper part of the support hole 4 of the bearing metal 2, and extends from the hole 18 to the outer peripheral surface of the bearing metal 2. Extending holes 19 and 20 are respectively bored. This hole 19 is the oil supply pipe 21
The hole 20 is connected to a bearing oil supply part (not shown) of the lower shaft in the bed through the oil supply pipe 22, and the hole 20 is connected to the oil supply part of the needle and balance mechanism in the arm 1 through a oil supply pipe 22. These holes 18, 19, 20 and oil supply pipes 21, 22 are filled with felt 23, and this felt 23 is attached to the main shaft 3 in the oil sump hole 5.
is in contact with. Further, a transparent oil gauge 24 is installed on the front side of the oil tank 8, so that the oil amount can be checked from outside the arm.

Next, its effect will be explained.

Here, the spiral groove 6, the lubricating oil suction hole 7,
It is assumed that the pipe 9 is filled with lubricating oil.

When the sewing machine is started, the main shaft 3 is rotated by the prime mover, and this rotation cooperates with the helical groove 6 in the bearing metal 2 to discharge the lubricating oil in the helical groove 6 to the oil sump hole 5. It also sucks lubricating oil from the oil tank side. The amount of lubricating oil discharged is proportional to the rotational speed of the main shaft 3. Most of the lubricating oil discharged and supplied to the oil sump hole 5 is supplied to the oil tank 8 and to each oil supply section through the first lubricating oil reducing hole 11 or this reducing hole 11 and the second lubricating oil reducing hole 13. oil tank 8.
and the oil sump hole 5. On the other hand, a portion of the supplied lubricating oil is transmitted through the wire 17 and is quickly supplied to the horizontal hook via the hook oil supply hole 15 and the hook oil supply pipe 16. In addition, the oil sump hole 5 of the main shaft 3
Due to the rotation within the shaft, some of the lubricating oil is transported from the lubricating oil outlet of the spiral groove 6 to the felt 23, and the needle,
It is supplied to the balance mechanism and the oil supply section of the lower shaft.

As described above, in this embodiment, lubricating oil is supplied to the oil sump hole 5.
Since the lubricating oil is circulated between the lubricating oil and the oil tank 8, a small amount of lubricating oil is required compared to the forced lubricating method.

Furthermore, even if the amount of lubricating oil discharged increases in proportion to the rotational speed of the main shaft 3, the lubricating oil in the oil sump hole 5 is substantially reduced due to the action of the first oil ring pipe 12 and the second oil ring pipe 14. Since the amount of lubricating oil is kept constant and the pressure of lubricating oil supplied to the horizontal hook is also kept constant, leakage of lubricating oil due to excessive supply of lubricating oil to the horizontal hook can be prevented.

Further, since the oil sump hole 5 and the bearing 2 are integrally formed, lubricating oil can be supplied to the oil sump hole 5 and oil can be supplied to the bearing 2 at the same time.

Furthermore, since the oil tank 8 is of a closed type, lubricating oil will not leak out to the outside of the machine frame even if the sewing machine is tilted for adjustment work.

[Effects of the invention] As detailed above, according to the sewing machine oil supply device of the invention, the lubricating oil is configured to circulate between the oil tank and the oil reservoir, so that the necessary lubrication can be achieved. The total amount of oil may be small. Furthermore, since the amount of lubricating oil in the oil reservoir is kept constant regardless of the rotational speed of the main shaft, the supply pressure of the lubricating oil supplied from the oil reservoir to each oil supply section is also kept constant. Therefore, since the amount of lubricating oil supplied does not become excessive, it is possible to prevent lubricating oil from leaking from each oil supply section. In addition, since the bearing and oil reservoir are integrally formed, lubricating oil can be supplied to the oil reservoir and the bearing at the same time, reducing the number of component parts and improving equipment efficiency. This has the effect of making assembly easier. Furthermore, there is an advantage that lubricating oil does not leak even when the machine frame is tilted, making it easy to handle.

[Brief explanation of drawings]

The drawings show an embodiment embodying the present invention, and FIG. 1 is a front view showing a main part thereof broken away, and FIG. 2 is a sectional view taken along the line 2-2 in FIG. 1 showing the main shaft rotating at low speed. , FIG. 3 is a drawing corresponding to FIG. 2 showing the main shaft rotating at high speed. 1 is an arm, 2 is a bearing metal, 3 is a main shaft, 4 is a support hole, 5 is an oil sump hole, 6 is a spiral groove, 8 is an oil tank, 11 and 13 are first and second reduction holes, 1
2 and 14 are first and second oil ring pipes, 16 is a pot oil supply pipe, and 21 and 22 are oil supply pipes.

Claims (1)

[Claims for Utility Model Registration] 1. A closed type oil tank 8 which is provided in the arm 1 of the sewing machine and contains lubricating oil, and which is rotatably supported by a bearing 2 provided in the arm 1 and which serves as a prime mover. a main shaft 3 operatively connected to the oil tank 8 within the arm 1;
an oil reservoir 5 provided above the oil level of the lubricating oil in the bearing 2 and formed within the bearing 2; A spiral groove 6 for supplying the lubricating oil in the oil tank 8 to the oil sump 5 by the rotational action of the main shaft 3; An oil supply device for a sewing machine, comprising: ring oil pipes 12, 14 connected to an oil tank 8; and oil supply pipes 16, 21, 22 connected from the oil reservoir 5 to an oil supply section of the sewing machine. 2 The oil sump 5 has a first reduction hole 11 and a second reduction hole 13 which is provided above the first reduction hole 11 and has a larger diameter than the first reduction hole 11. However, the first oil ring pipe 12 connected to the first reduction hole 11 and the second oil ring pipe 14 connected to the second reduction hole 13 are connected to the oil tank 8. A lubricating device for a sewing machine according to claim 1 of the utility model registration claim, characterized in that: 3 A spiral groove 6 is formed in the inner circumferential surface of the support hole 4 that supports the main shaft 3 in the bearing 2, and the oil reservoir 5 is formed into a cylindrical shape concentric with the support hole 4 so as to be wider than the support hole 4. The oil supply device for a sewing machine according to claim 1, which is characterized by having a large diameter and forming a gap with the main shaft 3.