JPS6011357Y2 - Lubricating oil supply device for machinery and equipment - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a lubricating oil supply device for various machines and appliances.

Conventional technology In the past, for example, in a sewing machine, in order to prevent the outer hook and inner hook of the thread wheel catcher from seizing, a method was adopted in which lubricating oil was forcibly pumped between the outer hook and the inner hook. It had been.

However, in machines such as cycle sewing machines that repeatedly start and stop in short cycles, the supply of lubricating oil to the operating mechanism of the machine becomes excessive. A slightly lubricating oil was leaking to the outside of the machine and was causing stains on the processed cloth.

Therefore, in order to prevent oversupply of lubricating oil, reducing the amount of lubricating oil supplied by the pump will cause wear and seizure of the rotating and sliding parts during machine operation, and the appropriate amount of lubricating oil will not be obtained when necessary. It was difficult.

Purpose The purpose of this invention is to provide a lubricating device capable of supplying an appropriate amount of lubricating oil to a moving mechanism part of a machine or appliance that operates intermittently at short intervals and always stops at a fixed position, such as the cycle sewing machine.

EXAMPLE Below, an embodiment of this invention in a cycle sewing machine will be described with reference to the drawings.A bottom cover 2 is fixed to the lower end of the bed 1 of the sewing machine frame, and an arc-shaped Lubricating oil is stored in the recess 2a.

A drive gear 4 is fixed to one end of a lower shaft 3 rotatably supported by the bed 1, and the lower end of the drive gear 4 is immersed in lubricating oil stored in the bottom cover 2.

Further, the lower shaft 3 is provided with a center hole 3a along its axis, and the lubricating oil pumped by a pump (not shown) passes through the center hole 3a and is attached to the drive gear 4 of the lower shaft 3. The liquid is discharged into the recess 2a of the bottom cover 2 from the opening of the center hole 3a on the side.

A discharge pipe 5 for lubricating oil is opened in this recess 2a, and the lubricating oil is maintained at a constant level below the opening position of the discharge pipe 5.

A pot shaft 7 is rotatably supported in the bed 1 diagonally above the lower shaft 3 via a bearing metal 6, and most of the pot shaft 7 is connected to the bed 1, the bottom lid 2, and the top lid that closes the top end of the bed 1. It is placed in a sealed chamber 9 defined by 8, and its tip protrudes outside of the sealed chamber 9.

A driven gear 10 that meshes with the drive gear 4 is fixed to the center of the hook shaft 7 by a screw 11, and due to the action of the drive gear 4 and the driven gear 10, the hook shaft 7 rotates as the lower shaft 3 rotates. It is designed to be driven.

At this time, the lubricating oil is splashed up by the driving gear 4, lubricates the driving gear 4 and the driven gear 10, and becomes a mist and scatters into the sealed chamber 9.

Further, a center hole 7a is provided at the center of the hook shaft 7 along its entire length, and one end opening of the center hole 7a is closed by a screw 12 screwed into the bed 1.

A thread loop catcher 13 is attached to the tip of the shuttle shaft 7 which projects outward from the sealed chamber 9.

This thread loop catcher 13 includes an outer hook 15 fixed to the hook shaft 7 with a screw 14, an inner hook holder 16 fixed to the outer hook 15,
An inner hook 17 has a flange-like race 17a rotatably fitted into a groove 16a formed by the outer hook 15 and the inner hook holder 16, and a well-known bobbin thread bobbin (not shown) accommodated in the inner hook 17. It consists of (not).

The outer hook 15 has a lubricating oil guide hole 15a that communicates the sliding surface of the groove 16a for the inner hook 17 and the race 17a of the inner hook 17 with the tip opening of the center hole 7a of the hook shaft 7 via a felt 15b. is provided.

At the upper end of the bed 1 that is closed by the upper M8, an opening 18 is provided above the driven gear 10, and a stepped oil pan 19 is provided around the base end side of the hook shaft 7 of the opening 18. is formed and receives the lubricating oil that is scattered in the form of mist.

As shown in FIGS. 4 and 5, the oil receiver is provided with a hole 19 extending downward from the portion 19 to a position reaching the bearing metal 6, and the bearing metal 6 is continuous with the hole 19a. A hole 6a extending from the outer periphery to the hook shaft 7 is provided, and a center hole 7a is provided at a position corresponding to the hole 6a of the hook shaft 7.
A radial hole 7b is formed to extend in the radial direction from the radial hole 7b, and these constitute a lubricating oil conduction path that communicates the oil receiver portion 19 with the center hole 7a of the hook shaft 7.

When the lower shaft 3 is stopped at a certain position (needle top position) by a known needle foot position stopping means (not shown) at the end of one sewing cycle, the hook shaft 7 has its radius hole 7b aligned with the bearing metal 6. It is designed to stop at a position communicating with the hole 6a.

As shown in FIGS. 4 and 5, the bed 1 is located in the middle of the hole 19a provided downward from the oil pan 19.
A flow rate adjustment screw 20 is protruded from the side surface.

This flow rate adjustment screw 20 has a small diameter portion 20a near its tip.
is provided, and when the small diameter portion 20a reaches the hole 19a by screwing in the flow rate adjusting screw 20 from the side surface of the bed 1, the upper and lower portions of the hole 19a are communicated, and the oil pan is connected from the portion 19 to the hook shaft 7. The flow rate of lubricating oil reaching the center hole 7a can be adjusted.

Further, a gap S1 is provided between the upper part of the hole 6a provided in the bearing metal 6 and the opening of the hole 19 by cutting the outer peripheral surface of the bearing metal 6 into a flat shape, and a gap S1 is provided between the upper part of the hole 6a and the lower part of the hole 6a. , a crescent-shaped gap S2 is formed between the inner peripheral surface of the bearing metal 6 and the outer peripheral surface of the hook shaft 7 by forming an arcuate surface having the same diameter as the inner diameter of the bearing metal 6.

These gaps S, S2 facilitate the conduction of lubricating oil from the hole 19a to the hole 6a and from the hole 6a to the radial hole 7b, respectively.

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

Now, when a cycle sewing machine is operated intermittently, the rotation of the lower shaft 3 is controlled by the driving gear 4 and the driven gear 10 to control the rotation of the hook shaft 7.
This causes the outer hook 15 of the thread loop catcher 13 to rotate.

At this time, the rotation of the drive gear 4 causes the recess 2a of the bottom cover 2 to
The lubricant oil stored in the container is splashed up and scattered in the form of mist inside the sealed chamber 9.

A part of this mist of lubricating oil is received by the oil receiver part 19 and then guided from the hole 19a thereof to the hole 6a of the bearing metal 6, but since the hook shaft 7 is rotating at a high speed, this The lubricating oil does not enter the radius hole 7b and center hole 7a provided in the hook shaft 7.

On the other hand, when the cycle sewing machine is stopped, the radial hole 7b is always stopped at the open position of the hole 6a.

Then, the lubricating oil stored in the hole 6a and the hole 19a above it is guided into the center hole 7a through the radial hole 7b of the hook shaft 7.

When the sewing machine is restarted from this state, the centrifugal force generated by the rotation of the hook shaft 7 and the outer hook 15 causes the lubricating oil in the center hole 7a to flow through the felt 15b and the lubricating oil guide hole of the outer hook 15. 15a, the outer hook 15 and the inner hook holder 16
It is guided to the groove 16a of the rotor and the rotating sliding surface of the inner hook 17, and this sliding surface is lubricated.

At the same time, the drive gear 4 splashes up the lubricating oil stored in the bottom cover 2 and scatters it in the form of a mist in the sealed chamber 9, and a portion of this is stored in the holes 19a and 6a.

When the sewing machine stops, the lubricating oil in the holes 19a and 6a is guided to the center hole 7a of the hook shaft 7, and the above operation is repeated.

Therefore, this lubricating oil supply device is used in the hole 19a during operation of the sewing machine.
The lubricating oil stored in t6a is guided to the center hole 7a of the hook shaft 7 when the sewing machine is subsequently stopped, and when the sewing machine is restarted, the lubricating oil in the center hole 7a is drawn out by the centrifugal force generated by the rotation of the outer hook 15. By guiding and lubricating the rotating sliding surfaces of the hook 15 and the inner hook 17, during each operation of this cycle sewing machine, which is operated intermittently at short intervals of several seconds,
A small but sufficient amount of lubricating oil I corresponding to the volume of the holes 19a and 6a can be supplied to the rotating sliding surface, thereby preventing wear and seizure of the outer hook 15 and the inner hook 17, and Since the supply of lubricating oil to this rotating sliding surface is stopped when the sewing machine is stopped, it is possible to eliminate the drawback of the conventional example in which the work cloth is soiled due to excessive supply of lubricating oil.

In addition to the above-mentioned cycle sewing machine, this invention can also be applied to various other machines that perform intermittent operation.

Effects As described above, according to this invention, the oil pan receives the lubricating oil splashed by the oil scattering means 4 during operation with the part 19 and guides it into the lubricating oil conduit 19at6a, so that the rotating shaft 7 is fixed. When stopped at the position, the radius hole 7b coincides with the lubricating oil passage 19av6a, and the lubricating oil flows through the center hole 7.
Since the lubricating oil is allowed to flow into the lubricant a, it is possible to stably supply a small amount of lubricating oil to the movement mechanism, thereby achieving excellent effects such as preventing wear and seizure of the movement mechanism.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing an embodiment of this invention, Fig. 2 is a cross-sectional view taken along the line A-A in Fig. 1, Fig. 3 is a partially cutaway view, and Fig. 4 is a cross-sectional view taken along the line A-A in Fig. 1. Similarly, a cross-sectional view of the lubricating oil conduit passage taken along the line B-B in Figure 1, and Figure 5 is a cross-sectional view of the lubricating oil passage portion taken along the line B-B in Figure 1.
FIG. 3 is a cross-sectional view of the flow rate adjustment screw portion taken along line C. Bed 1, drive gear 4, hook shaft 7, center hole? a. Radius hole 7b, sealed chamber 9, oil pan 19, hole 6a. 19a1 lubricating oil L0

Claims (1)

[Claims for Utility Model Registration] In a machine/appliance equipped with a rotating shaft 7 which is rotatably supported by a frame 1 and is rotated for a short period of time and then stopped at a fixed position, a central hole 7a with one end communicated with the movement mechanism; a sealed chamber 9 formed in the frame 1 and in which a lubricating oil is stored at the bottom; and a lubricating oil stored in the sealed chamber 9. In order to scatter
An oil scattering means 4 that moves in conjunction with the rotating shaft 7, and an oil receiver provided at a position higher than the rotating shaft 7 of the frame 1 to receive the lubricating oil splashed by the oil scattering means 4. The lubricating oil guide passages 19a, 6a for causing the lubricating oil received by the part 19 to flow down toward the rotating shaft 7, and the rotating shaft facing the lubricating oil conducting passages 19a, 6a. axis 7
At the top, a radius hole 7b is formed to extend in the radial direction from the center hole 7a, and when the rotating shaft 7 is stopped at a fixed position, the radius hole 7 is
A lubricating oil supply device characterized in that b coincides with the lubricating oil guide path 19av6a, so that lubricating oil flows into the center hole 1a.