JPH08155181A - Oiling device to the upper end of the vertical rotary shaft - Google Patents

Abstract

(57) [Summary] [Purpose] At any time of rotation of the vertical rotary shaft, and even when the amount of oil supply is large, a required fixed amount of lubricating oil is constantly supplied to the upper end of the rotary shaft. [Construction] A vertical rotation shaft having an oil feed passage 2a of a constant diameter parallel to and eccentric to the shaft center and having a horizontal hole 2b communicating to the outside on the side opposite to the eccentric direction of the oil feed passage. An oil tank 3 in which the lower opening end of 2 is arranged so as to float from the bottom, and a lubricating oil supplied when the vertical rotary shaft 2 rotates is stored and a fixed amount of the lubricating oil fed to the oil tank 3 per unit time. It consists of an oil feeder 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding portion at the upper end of a rotary shaft installed in the vertical direction, for example, an outer hook and an inner hook fixed to the upper end of the rotary shaft of a horizontal full rotary hook in an industrial sewing machine. The present invention relates to a device for supplying lubricating oil to the sliding part of the.

[0002]

2. Description of the Related Art Conventionally, as a device for supplying oil to a sliding portion between an outer hook and an inner hook fixed to the upper end of a rotary shaft of a horizontal full rotary hook, as shown in FIG.
And the one shown in FIG. 4 is known (Japanese Patent Publication No. 3-719).
20). The oil supply device forms a taper-shaped oil feed passage 2′a which is oriented axially inside the rotary shaft 2 ′ of the outer pot 1 and whose inner diameter increases upward, and the lower opening of the rotary shaft 2 ′ is formed. It is composed of a lubricating oil storage tank 3 whose end is floated from the bottom and a fixed quantity oil feeder 4 which stores the lubricating oil from a plunger pump (not shown) and sends the lubricating oil to the storage tank 3. is there.

In this oil supply device, the upper surface of the storage portion 4a of the metering oil feeder 4 is open, and the upper surface position is higher than the lower opening position of the oil feeding passage 2'a. During operation of the sewing machine, the lubricating oil is supplied from the plunger pump to the storage portion 4a via the tube 9, and the lubricating oil is supplied to the storage portion 4a.
Overflow from the upper surface of a. A fixed amount of lubricating oil is supplied to the oil feed path 2'a via the tube 10 per unit time.

During operation of the sewing machine, the lubricating oil collides with the inner peripheral surface of the oil feeding passage 2'a due to the tapering of the oil feeding passage 2'a and the centrifugal force caused by the rotation of the rotary shaft 2 '. It is easily sent upward, and its oil level A'has a quadratic curve (Fig. 4). The lubricating oil thus sent upward passes through the oil feed path 1b of the outer hook 1 and is supplied to the race surface 1a to lubricate the sliding with the inner hook (not shown). The total amount of oil entering the oil feed passage 2'a at this time is about B shown in FIG. 3 when converted to the oil level height from the lower end of the opening of the rotating shaft 2 '.

When the sewing machine stops and the rotary shaft 2'stops, the supply of lubricating oil from the plunger pump to the reservoir 4a also stops. Then, since the centrifugal force does not act on the lubricating oil that has entered the oil feed passage 2'a, the lubricating oil moves to the lower side of the oil feed passage 2'a and the lubrication that is stored in the storage portion 4a. The oil causes the tube 10 to move by potential energy.
Infiltration into the oil feed path 2'a through the oil tank 3
The heights of both oil surfaces C of a and the oil feed path 2'a are balanced (Fig. 3). The height of the oil level C in the oil feed path 2'a is higher than the height of the oil level B when the sewing machine operates.

[0006]

Since the lubricating device causes the lubricating oil to overflow from the storage portion 4a during the operation of the sewing machine, it has the advantage that it is not affected by the fluctuation of the plunger pump due to the intake of air or cavitation. However, there are the following problems.

That is, several minutes after the sewing machine is stopped, and during the restart of the sewing machine for several tens of seconds when the sewing machine is restarted, the tightness of the sewing is poor, and the upper thread loop called chochin is apt to occur in the seam on the back side of the sewn product. (Of course, after that, it will be a good seam). In addition, the bobbin wound on the bobbin may be dirty, or the upper thread may be too wet to stain the sewn product with oil. This phenomenon is
This is remarkable when the oil amount adjusting screw 8 is loosened in the arrow direction to increase the amount of lubricating oil supplied to the race surface 1a.

As described above, this is because even though the volume of the lubricating oil that has penetrated into the oil feed passage 2'a during operation of the sewing machine is as shown in FIG. After a lapse of a minute, the oil surface of the oil feed passage 2'a reaches the height shown in C in the figure, and when restarting, a large amount of lubricating oil having a difference in the oil surface height is excessively discharged from the race surface 1a, This is because the thread becomes too damp and sticks to the side surface of the inner pot, etc., causing a pulling failure due to a balance (not shown). When a large amount of lubricating oil is supplied from the storage portion 4a to the oil feed passage 2'a, the lower part of the oil surface A'in the oil feed passage 2'a during the sewing machine operation rises, and the oil feed passage 2'a rises. Since the total amount of oil entering 2'a increases, the height of the oil level C during the stop of the sewing machine also increases. Therefore, more lubricating oil is discharged from the race surface 1a, and the problem becomes more serious. It should be noted that after the oil amount difference is used up, it returns to a steady state (oil amount shown by B).

It is an object of the present invention to always supply a required fixed amount of lubricating oil to the upper end of the rotary shaft at any time of rotation of the vertical rotary shaft and when the amount of oil supply is large. I am trying.

[0010]

In order to achieve the above object, an oil supply device for an upper end of a vertical rotary shaft according to the present invention has an oil feed passage parallel to the shaft center and eccentric from the shaft center. The oil tank in which the lower opening end of the vertical rotary shaft is arranged so as to float above the bottom, and the lubricating oil supplied when the vertical rotary shaft rotates is stored and the lubricating oil is fed to the oil tank at a fixed amount per unit time. It consists of a metered oil feeder.
Further, a horizontal hole communicating with the outside can be formed on the lower side of the vertical rotation shaft on the side opposite to the eccentric direction of the oil feed path.

[0011]

In the oil supply device for the upper end of the vertical rotary shaft configured as described above, when the rotary shaft rotates, the oil surface of the lubricating oil that has penetrated into the oil feed line is Due to the eccentricity with respect to the shaft center and the centrifugal force, the eccentric direction causes the ascent to rise. At that time, since the lubricating oil is on the side opposite to the horizontal hole, it does not escape to the outside from the horizontal hole. When the rotating shaft is stopped, the oil level of the lubricating oil that has entered the oil passage becomes horizontal and rises in an attempt to balance with the lubricating oil stored in the metering oil feeder. It flows out through the hole.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, an example of a device for supplying lubricating oil to a sliding portion between an outer pot and an inner pot fixed to the upper end of a rotary shaft of a horizontal full-rotary pot will be taken as an example. The oil supply device will be described.

In this oil supply device, an oil feed passage 2a having a constant diameter is formed inside the rotary shaft 2 of the outer pot 1 in parallel with the shaft center and eccentric by a certain amount e from the shaft center. A horizontal hole 2b communicating with the outside at the lower part of the thick part of the opposite side of 2a
Is formed, and the lower opening end of the rotating shaft 2 is arranged so as to be floated from the bottom. The oil tank 3 stores the lubricating oil, and the lubricating oil supplied from a plunger pump (not shown) is stored and the lubricating oil is stored in the oil tank. 3 and a fixed quantity oil feeder 4 for feeding the oil.

One end of the outer hook 1 has a race surface 1a of the outer hook 1.
An oil feed passage 1b is formed, the other end of which communicates with the oil feed passage 2a.

Reference numeral 5 in FIG. 1 denotes the axis of the rotary shaft 2,
6 is the center of the oil feed path 2a. Then, as described above, the center 6 of the oil feed path 2a is eccentric from the axis 5 by a certain amount e.

The position of the horizontal hole 2b is set low so that the lubricating oil corresponding to the volume from the lower opening end of the rotary shaft 2 to the lower edge of the horizontal hole 2b rises to the race surface 1a.

The lower metal 7 forming a part of the bearing metal of the rotary shaft 2 is externally provided at a position communicating with the horizontal hole 2b of the rotary shaft 2 when the sewing machine stops and the outer hook 1 stops at a predetermined position. A horizontal hole 7a leading to the is formed. Therefore, the horizontal hole 2b of the rotary shaft 2 is horizontally oriented at the same height as the horizontal hole 7a of the lower metal 7.

The fixed-quantity oil feeder 4 has an oil tank 3 having a horizontal cross-sectional area.
Is smaller than the horizontal cross-sectional area of the storage section 4a and has an open upper surface, a lubricating oil inlet 4b to the storage section 4a, an outflow path 4c from the storage section 4a, and an outflow path 4c. It is constituted by an oil amount adjusting screw 8. Further, the storage portion 4a is held so that its upper surface position is higher than the lower opening position of the oil feed passage 2a. When the sewing machine is operating, the lubricating oil is supplied from the plunger pump to the storage portion 4a via the tube 9 and overflows from the upper surface of the storage portion 4a. A certain amount of lubricating oil is supplied per hit.

In the oil supply device for the upper end of the vertical rotary shaft configured as described above, when the rotary shaft 2 rotates during the sewing machine operation, the oil feed passage 2a is eccentric to the axial center of the rotary shaft 2 by a certain amount e. As a result, the oil surface A of the lubricating oil that has penetrated into the oil feed passage 2a is moved toward the eccentric direction by the centrifugal force and rises to be supplied to the race surface 1a. By the way, since the horizontal hole 2b of the rotating shaft 2 is horizontally oriented at the same height as the horizontal hole 7a of the lower metal 7, the two horizontal holes 2b and 7a communicate once each time the rotating shaft 2 makes one rotation. However, as described above, during the rotation of the rotary shaft 2, the lubricating oil is eccentric to the oil feed path 2a, that is, the side opposite to the horizontal hole 2b, so that the lubricating oil does not escape to the outside. However, when the sewing machine is stopped, the horizontal holes 2b and 7a are in communication with each other, and the lubricating oil that has entered the oil feed passage 2a is in a state where the lubricating oil is eccentric and the oil surface is horizontal. And rises in an attempt to balance with the lubricating oil stored in the storage portion 4a, but through the horizontal hole 2b of the rotary shaft 2 the lower metal 7
Since it flows out from the horizontal hole 7a of the oil, the oil level is optimum for rising to the race surface 1a (oil amount).
Kept in.

[0020]

Since the present invention is configured as described above, it has the following effects.

That is, when the rotation of the vertical rotary shaft is stopped, the lubricating oil that enters the oil feed passage of the rotary shaft from the constant quantity oil feeder is discharged to the outside from the horizontal hole. However, since the required constant lubricating oil is supplied to the upper end of the rotary shaft, a large amount of lubricating oil is not discharged within a few tens of seconds from the start of operation unlike the conventional one. When adopting this lubrication device on the rotary shaft of the horizontal full rotary hook of the sewing machine,
It is possible to prevent poor sewing tightness and the occurrence of product stains at the start of the next sewing. Further, since the oil feed passage is replaced by the conventional tapered one and has a constant diameter parallel to the shaft center and eccentric from the shaft center, the manufacturing cost can be greatly reduced. The above is the same when the amount of refueling is large.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an oil supply device for an upper end of a vertical rotation shaft according to the present invention.

FIG. 2 is a vertical cross-sectional view showing an oil surface state of a rotating oil feed passage in the oil supply device for the upper end of the vertical rotation shaft of the present invention.

FIG. 3 is a vertical cross-sectional view of a conventional horizontal full rotary hook oiling device.

FIG. 4 is a vertical cross-sectional view showing an oil surface state of a rotating oil feed passage in a conventional horizontal full rotary hook oil supply device.

[Explanation of symbols]

 1 Outer pot 2 Vertical rotation shaft 2a Oil feed path 2b Horizontal hole 3 Oil tank 4 Fixed amount oil feeder 5 Vertical axis of rotary shaft 7 Lower metal 7a Horizontal hole 8 Oil amount adjusting screw

Claims (2)

[Claims] 1. An oil tank in which a lower opening end of a vertical rotary shaft having an oil feed passage having a constant diameter parallel to the shaft center and eccentric from the shaft center inside is arranged so as to float above the bottom, and rotation of the vertical rotary shaft. An oil supply device for the upper end of the vertical rotating shaft, which consists of a fixed quantity oil feeder that stores the lubricating oil that is sometimes supplied and that feeds the lubricating oil to the oil tank in a fixed amount per unit time. 2. The oil supply device for the upper end of a vertical rotary shaft according to claim 1, wherein a horizontal hole communicating with the outside is formed on the lower side of the vertical rotary shaft on the side opposite to the eccentric direction of the oil feed passage.