JP2000308785A - Shuttle lubricating device of sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubricating device that securely and stably supplies lubricant to a full-rotation vertical shuttle in a short time by providing a lubricant hole, which is inside the lower shaft in the axial direction and forcibly supplies lubricant to the shuttle in the axial direction of the lower shaft by the centrifugal force generated by the rotation of the lower shaft. SOLUTION: In a lower shaft 12 which is slidably and rotatably inserted into a metal 3 fixed to a sewing machine bed 1, a tapered lubricant hole 12c is provided in the axial direction inside diameter of which increases from r to R as approaching a full-rotation vertical shuttle 4. Oil soaked into an oil core 7 is adhered to the peripheral of the lower shaft 12 at an end 7a of the oil core 7, and moves to the full-rotation vertical shuttle 4 along a helical groove 12a on the peripheral of the lower shaft 12 by the centrifugal force when the lower shaft 12 rotates. The oil drops from a lubricant hole 12b at the end of the helical groove 12a at the full-rotation vertical shuttle 4 side into the lubricant hole 12c inside the lower shaft 12, approaches the full-rotation vertical shuttle 4 along the taper of the lubricant hole 12c, and then, moves to an open end 12d of the lubricant hole 12c at the full-rotation vertical shuttle 4 side, and passes through the lubricant hole of the full-rotation vertical shuttle 4, then is supplied to the sliding part between the inner and outer shuttles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shuttle oil supply device for a sewing machine which supplies lubricating oil to a sliding portion between an inner shuttle and an outer shuttle of a full-rotation vertical shuttle.

[0002]

2. Description of the Related Art In FIG. 1 showing an example of a conventional oil supply device for a full-rotation vertical hook, reference numeral 1 denotes a sewing machine bed, 2 denotes a lower shaft, and a metal (support member) 3 fixed to the sewing machine bed 1.
It is slidably inserted through the inside. Reference numeral 4 denotes a vertical hook fixed to the tip of the lower shaft 2, and reference numeral 5 denotes an adjusting screw for adjusting the amount of oil to the vertical hook 4. Reference numeral 6 denotes a plastic oil supply pipe which is inserted into a pipe hole 3 a provided in the metal 3. Reference numeral 7 denotes an oil core inserted into the oil supply pipe 6, one end 7a of which is in contact with the outer periphery of the lower shaft 2, and the other end 7b is immersed in an oil reservoir (not shown).

In the above configuration, the oil that has penetrated into the other end 7b of the oil core 7 immersed in the oil sump is supplied to the one end 7
a, the lower shaft 2 rotates and moves to the vertical shuttle 4 along the spiral groove 2a provided on the outer periphery of the lower shaft 2 by centrifugal force when the lower shaft 2 rotates. Oil flows from an oil hole 2b perpendicular to the lower shaft 2 provided at the end on the 4 side into a cylindrical oil hole 2c parallel to the lower shaft 2 provided in the lower shaft 2, and the vertical hook of the oil hole 2c in the lower shaft 2 The water is supplied from the 4 side open end 2d to a sliding portion between the inner hook and the outer hook via an oil hole (not shown) in the vertical hook 4.

The amount of oil supplied to the sliding portion between the inner pot and the outer pot can be adjusted by the magnitude of the pressure at which the tip 5a of the adjusting screw 5 presses the outer periphery of the plastic oil supply pipe 6. When the screw 5 is screwed in, the amount of oil decreases, and when the screw 5 is loosened, the amount of oil increases.

[0005]

However, in the above-described conventional hook oil supply device, the oil hole 2c provided in the lower shaft 2 is provided.
Has a cylindrical shape parallel to the lower shaft 2, it is difficult for the vertical hook 4 to be supplied with oil by the centrifugal force due to the rotation of the lower shaft 2 unless the oil in the oil hole 2 c is filled with a certain amount or more. It takes a long time until the oil is supplied to the sliding contact portion with the shuttle, and during low-speed rotation, the amount of oil flowing from the oil hole 2b to the oil hole 2c via the spiral groove 2a is physically reduced, so that the oil is supplied to the vertical shuttle 4. There is a problem that the amount is insufficient.

At the time of high-speed rotation, the amount of oil flowing from the oil hole 2b into the oil hole 2c via the spiral groove 2a should be physically large, but a part of the oil flowing into the oil hole 2c is centrifugal force due to the high rotation. As a result, the oil flow into the oil hole 2c becomes unstable because it attempts to return from the oil hole 2b to the spiral groove 2a, and the adjustment of the oil amount by the adjusting screw 5 becomes unstable.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a lubricating apparatus capable of supplying lubricating oil to a full-rotation vertical hook in a short time, reliably and stably.

[0008]

SUMMARY OF THE INVENTION According to the present invention, in a lubricating device for a full-rotation vertical hook, oil in an oil hole in a lower shaft can be forcibly fed to the hook side by centrifugal force due to rotation of the lower shaft. The oil hole along the axial direction formed in the lower shaft is provided in the lower shaft. According to the invention of claim 2, the shape of the oil hole along the axial direction in the lower shaft has an inner diameter as it approaches the shuttle side. Is formed as a straight line or a smooth curve, so that the oil in the oil hole along the axial direction in the lower shaft is forcibly fed to the shuttle by the rotation of the lower shaft.

According to the third aspect of the present invention, since the spiral groove is provided in the axial oil hole in the lower shaft, the oil in the oil hole along the axial direction in the lower shaft is rotated by the rotation of the lower shaft. It is forcibly fed to the shuttle along the groove.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION
This will be described with reference to FIGS. FIG. 2 shows the first embodiment, except for the lower shaft 12, which is the same as FIG. 1 showing a configuration example of the prior art. The inner diameter of the lower shaft 12 increases from r to R as approaching the vertical shuttle 4 side. A tapered oil hole 12c is provided along the axial direction.

In the above configuration, the oil that has penetrated into the oil core 7 adheres to the outer periphery of the lower shaft 12 at one end 7a of the oil core 7, and when the lower shaft 12 rotates, the oil permeates the outer periphery of the lower shaft 12 by centrifugal force. It moves to the vertical hook 4 side along the provided spiral groove 12a, and from the oil hole 12b perpendicular to the lower shaft 12 provided at the end of the spiral groove 12a on the vertical hook 4 side to the oil hole 12c provided in the lower shaft 12. It flows into the vertical hook 4 along the taper of the oil hole 12c, and moves from the open end 12d of the oil hole 12c on the vertical hook 4 side through the oil hole (not shown) in the vertical hook 4 to the inner hook and the outer hook. Is reliably supplied in a short period of time to the sliding contact portion.

In the first embodiment, the oil hole 12c in the lower shaft 12 is a tapered hole. However, as the oil hole 12c approaches the vertical hook 4, the oil hole is formed as a smooth curve whose inner diameter increases from r to R. It is good. FIG. 3 shows a second embodiment, in which the configuration other than the lower shaft 22 is the same as that of FIG.
Inside 2 is provided an oil hole 22c in which a spiral groove is provided on the inner periphery of a cylindrical hole along the axial direction.

In the above configuration, the oil that has penetrated into the oil core 7 adheres to the outer periphery of the lower shaft 22 at one end 7a of the oil core 7, and when the lower shaft 22 rotates, the oil permeates the outer periphery of the lower shaft 22 by centrifugal force. It moves to the vertical hook 4 side along the provided spiral groove 22a, and from the oil hole 22b perpendicular to the lower shaft 22 provided at the end of the spiral groove 22a on the vertical hook 4 side to the oil hole 22c provided in the lower shaft 22. It flows into the vertical hook 4 reliably along the spiral groove of the oil hole 22c, and from the open end 22d of the oil hole 22c on the vertical hook 4 side through the oil hole (not shown) in the vertical hook 4 to the inner hook and the outer hook. Is reliably supplied in a short time to the sliding contact portion.

In the second embodiment, the oil hole 22c has a spiral groove on the inner periphery of the cylindrical hole in the lower shaft 22, but the spiral groove may be a female screw. As described above, according to the above embodiment, the oil that has flowed into the oil hole along the axial direction in the lower shaft is forcibly fed to the hook side, so that a certain amount of oil in the oil hole in the lower shaft is Is not satisfied, and even if the amount of oil flowing into the oil hole in the lower shaft during low-speed rotation is small, the oil can be reliably supplied to the shuttle in a short time. Further, it is possible to stably perform the adjustment of the gradual increase / decrease of the oil amount by the adjusting screw at the time of high-speed rotation.

[0015]

As described above, according to the shuttle lubricating apparatus of the present invention, when the oil in the oil hole in the lower shaft is not filled with a certain amount or more of oil immediately after the operation of the sewing machine or when the sewing machine is rotating at a low speed, Even when the amount of oil flowing into the oil hole is small, the sliding contact between the inner and outer hooks of the full-rotation vertical hook can be reliably supplied in a short time,
This has the effect of preventing seizure, heat generation, wear, oil stains, etc. due to lack of lubricating oil.

Also, since the oil amount can be adjusted stably even at high speed rotation, oil leakage due to an excessive amount of the oil in the hook and contamination of the sewn product can be prevented. Has the effect of preventing

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a configuration example of a conventional oil supply device for a full-rotation vertical hook.

FIG. 2 is a cross-sectional view of the shuttle oil supply device according to the first embodiment of the present invention.

FIG. 3 is a sectional view of a shuttle oil supply device according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 sewing machine 2, 12, 22 Lower shaft 2a, 12a, 22a Spiral groove 2b, 12b, 22b on lower shaft outer periphery Oil hole 2c, 12c, 22c perpendicular to lower shaft Oil hole in lower shaft 3 Metal (support member) 4 Full rotation vertical hook 5 Oil adjustment screw 6 Oil supply pipe 7 Oil core

Claims (3)

[Claims] In an oil supply device for a full-rotation vertical hook, an axial direction in which lubricating oil is forcibly fed to the hook side along the axial direction of the lower shaft by centrifugal force generated by rotation of the lower shaft. An oil hole along the bottom is provided in the lower shaft. 2. The shape of the oil hole along the axial direction in the lower shaft,
2. The hook oil supply device for a sewing machine according to claim 1, wherein the hook is formed as a straight line or a smooth curve whose inside diameter increases as approaching the hook side. 3. The shuttle oil supply device for a sewing machine according to claim 1, wherein a spiral groove is provided in an oil hole along the axial direction in the lower shaft.