JP2002126388A - Shuttle of sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shuttle which can stably feed lubricating oil to the race surface of an inner shuttle. SOLUTION: The shuttle of a sewing machine includes an outer shuttle 26 rotatably supporting an inner shuttle 24 through the race surface 24a of the inner shuttle, a lower shaft 8 coacting with a sewing machine driving mechanism, the outer shuttle 26 being fixed on one of the ends of the shaft 8, a circular oil groove 32, and an oil feed hole 34 formed in the circumferential direction of the oil groove. In the shuttle, lubricating oil fed by an oil feed pump 4 coacting with the sewing machine driving mechanism to feed lubricating oil in an oil tank 2 to the shuttle is fed to the race surface 24a from the hole 34 via the oil groove, and the center of the outer circumference 32C of the oil groove is offset toward the oil hole 34 with respect to the axis of rotation 8C of the shuttle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a sewing machine hook.

[0002]

2. Description of the Related Art As shown in FIG.
An inner hook 24 having an inner hook race surface 24a, an outer hook 26 rotatably supporting the inner hook 24 via the inner hook race surface 24a, and an outer hook 26 fixed to one end of the sewing machine, not shown. It has a shuttle shaft (lower shaft) 8 that is interlocked with the drive mechanism. Outer pot 26
A circular hook groove (oil groove) 32 is formed on the hook shaft mounting side, and an oil supply hole 34 is formed from the outer peripheral direction of the hook groove 32 to the inner hook race surface 24a. The hook shaft 8 has a hollow shape, and has a small hole 8a formed at the tip thereof.

The sewing machine is provided with an oil supply pump and an oil supply adjustment mechanism (not shown), and the oil is supplied to the shuttle 8 in a stable state. The oil supplied from the oil supply pump to the inside of the hollow hook shaft 8 moves from the hook shaft 8 to the hook groove 32 and then enters the oil feed hole 34 by centrifugal force. And the refueling hole 3
The oil that has entered inside 4 is further subjected to centrifugal force to supply race surface supply portion 34.
reaches a. Thus, the action of the centrifugal force is indispensable for the oil supplied to the shuttle shaft 8 to reach the inner shuttle race surface 24a.

[0004]

However, when the center of the hook groove 32 or the center of the outer hook 26 is eccentric with respect to the rotation center of the hook shaft 8 due to a part manufacturing error, in particular, the hook shaft 8
In the state where the oil supply hole 34 is eccentric with respect to the rotation center of the oil supply hole 34, the oil supplied to the hook groove 32 is pressed against the oil supply hole 34 by centrifugal force. As a result, the quantity of oil continuously supplied to the inner hook race surface 24a becomes unstable in quantity. This phenomenon poses a problem when, for example, a small amount of oil that dislikes oil contamination is desired to be supplied (when the allowable amount of the supplied oil is small), the burner 22 burns. After the oil supplied to the hook groove portion 32 reaches the position of the oil supply hole 34, there is no such problem, and the oil reaches the race surface supply portion 34a stably by centrifugal force.

Since the outer hook 26 is normally fixed to the hook shaft 8 by two screws, the mounting portion of the outer hook 26 and the hook shaft 8 has a play for the clearance, and the outer hook 26 is attached by the play. At this time, the outer hook 26 is screwed into the oil supply hole 34.
A similar problem arises when pressed against the opposite side.

An object of the present invention is to prevent instability in the amount of oil supplied to the inner hook race surface 24a due to the eccentricity of the hook groove 32 caused by part manufacturing errors and the eccentricity caused by backlash when the outer hook 26 is mounted. It is to provide a kettle that can do.

[0007]

According to the present invention, there is provided an outer hook for rotatably supporting an inner hook via an inner hook race surface, and connecting the outer hook to one end. A lower shaft fixed and interlocked with the sewing machine drive mechanism, a circular oil groove formed in the outer hook, and an oil supply hole formed in an outer circumferential direction of the oil groove, and provided in cooperation with the sewing machine drive mechanism. The lubricating oil supplied by an oil supply pump that supplies the lubricating oil in the oil tank to the sewing machine hook portion is supplied to the inner hook race surface by an oil supply hole through an oil groove. In contrast, a sewing machine hook is provided in which the center of the oil groove outer periphery is eccentric toward the oil supply hole side. Further, an outer hook that rotatably supports the inner hook via an inner hook race surface, a lower shaft that fixes the outer hook to one end side, and that is interlocked with a sewing machine driving mechanism, are formed on the outer hook. It has a circular oil groove and an oil supply hole formed in the outer peripheral direction of the oil groove, and is supplied by an oil supply pump that supplies the lubricating oil in the oil tank to the sewing machine hook in conjunction with the sewing machine drive mechanism. Lubricating oil is fitted to the outer periphery of the oil groove in the shuttle of the sewing machine in which the lubricating oil is supplied to the inner hook race surface by the oil supply hole via the oil groove, and the inner periphery of the lubrication oil is supplied to the rotation axis of the hook shaft. A sewing machine hook provided with a collar member, which is eccentric toward the hole side, is provided.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a sewing machine hook according to the present invention will be described below with reference to FIGS.
First, an example of the oil supply mechanism from the oil tank to the hook shaft is shown in FIG.
This will be described with reference to FIG. This hook oil supply mechanism includes four parts of an oil tank 2, an oil supply pump 4, an oil amount controller 6, and a hook shaft 8,
Refueling pipe 10 (10a, 10a) connecting these four parts
b, 10c) and the return pipe 12 (12a, 12b).

The oil tank 2 is a container for storing oil. The oil supply pump 4 has a function of sucking up the lubricating oil in the oil tank 2 and supplying the lubricating oil to the shuttle shaft 8 in conjunction with the sewing machine driving mechanism. In the illustrated example, a plunger type pump is employed. The refueling pump 4 and the oil tank 2 are connected to the refueling pipe 1
0a, the oil supply pump 4 and the oil amount controller 6 are connected by an oil supply pipe 10b. When the sewing machine is driven by a motor (not shown) or the like, the main shaft 14 rotates. By the rotation of the main shaft 14, an outer peripheral cam 14a provided on a part of the main shaft 14 reciprocates the plunger 16, and the oil in the oil tank 2 pumped through the oil supply pipe 10a is discharged through the oil supply pipe 10b. To the oil amount controller 6.

An oil supply pipe 10c for sending the oil sent from the oil amount adjuster 6 to the shuttle shaft 8 is provided in the oil amount adjuster 6.
And a return pipe 12a, 1 for returning to the oil tank 2.
2b is connected to the inside thereof, a flow path 6a connecting the oil supply pipe 10a and the oil supply pipe 10c, a flow path 6b connecting the flow path 6a and the return pipe 12a, a flow path 6a and the return pipe 12b. Is formed. Further, a kettle oil amount control valve 18 is provided in the flow path 6b.
A hook oil amount control valve 20 is provided in c. These two
The two pot oil amount control valves 18 and 20 are screw type valves having a male screw portion meshed with a female screw portion formed in the oil amount controller 6, and by rotating the valves to advance and retreat, the flow paths 6b and By changing the gap through which the oil in 6c can pass and by changing the internal pressure, the amount of oil scattered from the shuttle 22 is controlled. Rough adjustment of the oil supply amount can be performed by the hook oil amount adjustment valve 18 on the oil supply pump 4 side, and fine adjustment can be performed by the hook oil amount adjustment valve 20 on the hook shaft 8 side.

As shown in FIG. 2, the shuttle 22 of the present embodiment supports an inner shuttle 24 having an inner shuttle race surface 24a and a rotatable inner shuttle 24 via the inner shuttle race surface 24a. It has an outer shuttle 26 and an shuttle shaft (lower shaft) 8 which fixes the outer shuttle 26 to one end side and is interlocked with a sewing machine driving mechanism (not shown). A hole 28 for inserting the shuttle shaft 8 is formed in the outer shuttle 26, and the outer shuttle 26 is fixed to the shuttle shaft 8 by a screw (not shown) screwed into the screw hole 30. A circular hook groove (oil groove) 32 is formed in the outer hook 26 at the tip end of the hole 28, and an oil supply hole 34 is formed from the outer peripheral direction of the hook groove 32 to the inner hook race surface 24a. . The hook shaft 8 has a hollow shape,
A small hole 8a is formed at the tip.

The lubricating oil supplied to the inside of the hook shaft 8 by the oil supply pump 4 moves to the circular hook groove 32 through the small hole 8a, from which the centrifugal force acts as described above. As a result, the oil enters the oil supply hole 34 and is further supplied to the inner hook race surface 24a.

The outer peripheral center 32C of the shuttle groove 32 is eccentric toward the oil supply hole 34 with respect to the rotation center 8C of the shuttle shaft 8. The eccentricity is determined by the eccentricity associated with the part manufacturing accuracy and the outer hook 26.
It is preferably larger than the sum of the play and the play of the clearance of the shuttle shaft 8, for example, 0.1 mm.
The hook groove 32a drawn by a two-dot chain line in FIG. 2 shows a case where the amount of eccentricity is zero.

When the outer peripheral center 32C of the hook groove 32 is eccentric toward the oil supply hole 34 in this manner, the outer hook 26 is moved to the hook shaft 8 due to manufacturing errors of parts and play when the outer hook 26 is attached to the hook shaft 8. Lubrication hole 3 even if it is eccentric with respect to the rotation center 8C
4 can be positioned in a direction in which the outer periphery of the hook groove 32 is eccentric with respect to the rotation center 8C of the hook shaft 8. Therefore,
A stable hook oil supply amount can be obtained regardless of the play at the time of attaching the outer hook 26 and the dispersion of parts (kettles).

Next, a second embodiment of the sewing machine hook according to the present invention will be described with reference to FIGS. This pot 22
Has a collar member 40 shown in FIG. 4, and this collar member 40 is fitted into the hook groove 32 of FIG. Color member 4
Numeral 0 has an outer peripheral portion 42 fitted into the hook groove portion 32 and an inner peripheral portion 44, and a hole 40 a is formed to supply oil in the inner peripheral portion 44 to the oil supply hole 34. The center 44C of the inner peripheral portion 44 is eccentric in the direction of the oil supply hole 34 with respect to the rotation center 8C of the shuttle shaft 8.

If the position of the mounting position in the rotation direction of the collar member 40 is configured to be adjustable by a small angle, the outer hook 2 can be adjusted.
Since the position of the oil supply hole 34 of No. 6 and the hole 40a of the collar member 40 can be shifted, the amount of oil supply can be adjusted.
Further, since the oil supply hole 34 formed in the outer hook 26 is a very small hole for supplying a small amount of oil, it is difficult to process the oil supply hole 34. However, according to the present embodiment, the collar member 40 The effect of supplying a small amount of oil can be obtained by reducing the size of the hole 40a on the side, making it easy to manufacture, and without having to decenter the processing on the hook side, the collar member 40 can be easily manufactured by a mold. Is possible, and the cost can be reduced.

[0017]

According to the present invention, the center of the oil groove is eccentric with respect to the center of rotation of the hook shaft toward the oil supply hole side. , The oil supply hole can always be positioned eccentrically with respect to the rotation center of the shuttle.
Therefore, a stable oil supply amount can be obtained regardless of the play at the time of attaching the shuttle and the variation at the time of manufacturing the parts.

When a collar member is provided which is fitted to the outer peripheral portion of the oil groove and whose inner peripheral portion is eccentric with respect to the center of rotation of the hook shaft, there is no need to eccentric the hook groove portion of the outer hook. It will be easier. Further, the collar member can be easily manufactured using a mold.

[Brief description of the drawings]

FIG. 1 is a view conceptually showing an example of an oil supply mechanism from an oil tank to a shuttle shaft according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating the shuttle according to the first embodiment.

FIG. 3 is a sectional view of a shuttle according to a second embodiment.

FIG. 4 is a view showing a collar member of a shuttle according to a second embodiment.

FIG. 5 is a sectional view of a shuttle according to a conventional example.

[Explanation of symbols]

2 Oil tank 4 Oil pump 8 Lower shaft (hook shaft) 8 Hook shaft 8C Rotation center of hook shaft 22 Hook 24a Inner hook race surface 26 Outer hook 32 Hook groove (oil groove) 32C Center of outer circumference of hook groove 34 Oil hole 4
0 Collar member 44 Inner circumference of collar member

Claims (2)

[Claims] An outer hook rotatably supporting the inner hook via an inner hook race surface, a lower shaft fixed to one end of the outer hook and interlocking with a sewing machine driving mechanism; A circular oil groove formed, and an oil supply hole formed in an outer peripheral direction of the oil groove. The oil supply pump supplies the lubricating oil in the oil tank to the sewing machine hook in conjunction with the sewing machine driving mechanism. In the sewing machine hook where the supplied lubricating oil is supplied to the inner hook race surface through the oil groove via the oil groove, the outer circumferential center of the oil groove is biased toward the oil hole side with respect to the rotation axis of the hook shaft. A sewing machine kettle characterized by what you care about. 2. An outer shuttle that rotatably supports the inner shuttle via an inner shuttle race surface, a lower shaft fixed to one end of the outer shuttle and interlocked with a sewing machine driving mechanism, A circular oil groove formed, and an oil supply hole formed in an outer peripheral direction of the oil groove. The oil supply pump supplies the lubricating oil in the oil tank to the sewing machine hook in conjunction with the sewing machine driving mechanism. In the sewing machine hook where the supplied lubricating oil is supplied to the inner hook race surface by the oil supply hole through the oil groove, the oil groove is fitted to the outer peripheral portion of the oil groove, and the inner peripheral portion thereof is positioned with respect to the rotation axis of the shuttle shaft. A sewing machine hook provided with a collar member which is eccentric toward the oil supply hole side.