JP2001145795A - Bobbin winding device of sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sewing operation efficiency and to eliminate waste of a thread by preventing a thread from winding round a bobbin winding shaft and surely winding round a bobbin to save the trouble of rewinding for a bobbin winding and removing a thread wound round a bobbin winding shaft during the time of winding a thread round the bobbin by a bobbin winder of a sewing machine. SOLUTION: In a bobbin winding device of a sewing machine in which a wine-cup like bobbin bearer is disposed on a bobbin winding shaft, a bobbin having flanges at both ends thereof is mounted on the bobbin winding shaft through the bobbin bearer, and the bobbin winding shaft is rotated to wind a bobbin thread round the bobbin, the bobbin bearer is installed in a recessed part having a diameter larger than the outer periphery of the bobbin bearer, and having an end face rather closer to the bobbin bearer side than the flange inside surface of the bobbin of the bobbin bearer side. An inclined surface and a thread receiving part are formed on the bobbin bearer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread winding device for a sewing machine which prevents a thread from winding around a thread winding shaft of the thread winding device.

[0002]

2. Description of the Related Art The structure of a conventional thread winding device will be described below.
This will be described with reference to FIGS. In FIG.
1 is a sewing machine arm, A is a thread winding device, B is a second thread guide, C is a first thread guide, and T is a thread wound on a bobbin.

Next, the construction of the thread winding device A will be described with reference to FIG. The base 1a is formed with a bearing 1b, an opening 1c, and a support shaft 1d projecting downward. The lever shaft 2a is loosely fitted to the bearing portion 1b of the base 1a from below, and the cam portion 2b is fixed to the lower end. The thread winding lever 2c is fixed to an upper end of a lever shaft 2a protruding from above the bearing portion 1b of the base 1a by a screw 2d. The adjusting plate 2e is provided with a thread presser 2h which enters a bobbin thread winding portion.
Is formed, and is fixed to the thread winding lever 2c by the screw 2f.

[0004] The base 3a has a cylindrical bearing 3b at the base of which the bobbin shaft 4a fits, and a hole 3c at the side end surface thereof. A support hole 3d into which the support shaft 1d of the base 1a fits is formed at the tip. A bobbin shaft 4c and a groove 4d are formed above the bobbin shaft 4a, and a bobbin shaft 4c and a groove 4d are formed above the bobbin shaft 4a. The bobbin wheel 4e is fixed to the lower end of the bobbin shaft 4a, and a rubber ring 4f is fitted around the outer periphery thereof. The O-ring 4g is fitted in the groove 4d of the bobbin shaft. Press plate 5
In a, a base is rotatably supported by a base 1a, spring hooks 5b and 5c are formed at one end, and a pressing portion 5d is formed at the other end.
Are formed, and a concave portion 5e facing the cam portion 2b is formed on the side surface.

The headstock 3a and the pressing plate 5a are
In an overlapped state, it is rotatably fitted to the support shaft 1d of the base 1a so as to be rotatable from below, and is supported by the support shaft 1d by the E-ring 4h so as not to fall.

As shown in FIG. 17, a spring 6a is arranged in a compressed state between a spring hook 5c of the pressing plate 5a and a part of the base 1a, and a spring 7a is pivotally connected to the spring hook 5b of the pressing plate 5a. It is arranged in a compressed state between the hole 3c at the tip of the table 3a.

The disc-shaped bobbin receiving stand 8a is provided with a bobbin shaft 4c of a bobbin shaft 4a projecting above the opening 1c of the base 1a.
And a shallow circular groove 8b for mounting the bobbin 9a is formed on the upper end surface. The configuration of the conventional thread winding device is as described above. Next, the operation will be described with reference to FIGS.

In the thread winding standby position, as shown in FIG. 15, the thread winding lever 2c and the thread presser 2h are located apart from the space between the flanges 9b and 9c of the bobbin 9a.
When the bobbin winding lever 2c is at this position, when the
As shown in FIG. 6, the tip of the cam portion 2b coincides with the deepest portion of the concave portion 5e of the pressing plate 5a, and is pressed by the elastic force of the spring 6a. Due to this elastic force, the pressing portion 5d of the pressing plate 5a
Presses the bearing portion 3b of the shaft base 3a to rotate the shaft base 3a about the support shaft 1d, whereby the rubber ring 4f of the bobbin shaft 4a rotates the main shaft 2 as shown by the solid line in FIG. Wheel 3
Away from

Therefore, even if the main shaft 2 rotates when the bobbin lever 2c is at the standby position, the rubber ring 4f, that is, the bobbin shaft 4a, does not rotate.

In order to wind the thread T around the bobbin 9a from the above state, the thread end is passed from the first thread guide C to the second thread guide B shown in FIG. It winds around the shaft part of the provided empty bobbin 9a several times.

From the above state, the tip of the thread winding lever 2c is rotated clockwise in FIG. 15 (counterclockwise in FIGS. 17 and 19), whereby the thread presser 2h fixed to the thread winding lever 2c is moved to the bobbin 9a. Between the flanges 9b and 9c,
The thread winding position comes into contact with the shaft.

By the rotation of the lever shaft 2a, FIG.
As shown in the figure, the cam portion 2b is separated from the deepest portion of the concave portion 5e of the pressing plate 5a, and the pressing plate 5a is moved to the supporting shaft 1 by its tip.
It is pressed against the spring 6a so as to rotate clockwise about d, and is locked at the position shown in FIG. By the above rotation of the pressing plate 5a, the tip of the shaft base 3a is pressed by the elastic force of the spring 7a, whereby the shaft base 3a rotates clockwise in FIG. 19 around the support shaft 1d. The outer periphery of the rubber ring 4f at the lower end of the bobbin shaft 4a is pressed against the rotating wheel 3 of the main shaft 2 as shown by a two-dot chain line in FIG.

When the rotating wheel 3 rotates following the main shaft 2,
The winding shaft 4a rotates via the rubber ring 4f,
The thread T is wound around the shaft portion of the bobbin 9a which is integrally and rotatably supported by an elastic member (not shown) provided at a.

When the diameter of the thread T to be wound increases as the quantity of the thread T increases, the thread presser 2h is pushed downward in FIG. 19 by the outer periphery of the thread T wound around the shaft of the bobbin 9a, whereby the thread winding lever 2c gradually rotates clockwise,
The tip of the cam portion 2b of the lever shaft 2a gradually rotates toward the deepest portion of the concave portion 5e of the pressing plate 5a according to the thread winding amount of the bobbin 9a.

When the amount of thread wound around the bobbin 9a becomes appropriate, the tip of the cam portion 2b of the lever shaft 2a is
A reaches the deepest portion of the concave portion 5e, whereby the pressing plate 5a rotates counterclockwise in FIG. 19 around the support shaft 1d by the elastic force of the spring 6a.

The rotation of the pressing plate 5a causes the pressing plate 5a to rotate.
Pressing portion 5d presses the shaft portion 3b at the tip of the shaft base 3a,
a rotates counterclockwise about the support shaft 1d in FIG. By this rotation, the rubber ring 4f at the lower end of the thread winding shaft 4a
16 is separated from the side end surface of the rotating wheel 3 of the main shaft 2 as shown by a solid line in FIG. 16, and the O-ring 4g comes into contact with the base 1a, and the thread winding shaft 4a is rapidly stopped. The thread winding lever 2c and the thread presser 2h return to the states shown in FIGS. 15 and 17, and the thread winding is completed.

[0017]

However, the conventional thread winding device described above has the following problems.

That is, as described above, the bobbin support 8
When the thread is wound around the bobbin 9a using the thread a, the thread is loosened at the beginning of winding the thread on the bobbin or in the middle of the thread winding, and the thread T is moved to the position shown in FIG.
As shown by the two-dot chain line at 0A, the thread T slips from the outer peripheral direction of the flange 9c of the bobbin 9a to the outside of the bobbin receiving stand 8a, and if the user continues to wind the yarn without noticing this, the two-dot chain line thread T becomes
As shown in FIG. 18B, when the bobbin thread continues to be wound under the bobbin cradle 8a and further continued to be wound, the bobbin shaft 4a rotates while the bobbin T is wound around the bobbin shaft 4a below the bobbin cradle 8a as shown in FIG. I do.

For this reason, since the bobbin cannot be wound on the bobbin, the bobbin must be wound again, and it takes much time to remove the yarn wound around the bobbin shaft. In such a case, care must be taken to prevent the thread from loosening, and there is a problem that the sewing work efficiency is reduced.

Further, since many unnecessary yarns are wound around the yarn winding shaft, there is a problem that the yarns are wasted and uneconomical.

In the case of a yarn having a large tension such as a thick yarn, the yarn winding device may be broken.

A bobbin receiving stand 8c shown in FIG. 21 is also known, but even in this shape, if it is wound around the cylindrical portion 8e of the bobbin receiving stand 8c, the same problem as described above occurs.

[0023]

According to a first aspect of the present invention, there is provided a cup-shaped cup for supporting a bobbin fitted on a bobbin shaft protruding from a base and placing a bobbin fitted into the bobbin shaft. In the thread winding device of the sewing machine that winds the thread around the bobbin by rotating the thread winding shaft, when the thread wound around the bobbin swells outward from the flange of the bobbin, A blocking means is provided to prevent the bobbin from entering the base side from the bobbin receiving stand.

According to a second aspect of the present invention, as the blocking means, a protrusion is provided on the outer ring having a diameter larger than the outer periphery of the bobbin receiving stand so as to surround the bobbin receiving stand. According to a third aspect of the present invention, the protrusion has an upper end surface substantially flush with an upper end of the bobbin receiving base. According to a fourth aspect of the present invention, the blocking means is continuous below the outer periphery of the bobbin mounting surface of the bobbin receiving base such that the outer periphery gradually increases in one axial direction of the bobbin shaft. An inclined surface was formed. According to a fifth aspect of the present invention, as the blocking means, the bobbin mounting of the bobbin receiving base is bent in a direction parallel to or away from the base, and the outer diameter gradually increases with distance from the bobbin axis. A continuous thread receiving portion was provided at the lower end of the outer periphery of the placing surface. According to a sixth aspect of the present invention, there is provided the configuration of both the fourth and fifth aspects.

According to the first to sixth aspects of the present invention, the yarn is loosened at the beginning of winding of the yarn on the bobbin or during the winding of the yarn, and the yarn T is moved to the bobbin 9a as shown by a two-dot chain line in FIG. 20A.
This thread T is received by the upper end surface of the concave portion and does not drop below the bobbin receiving base even if the yarn T slides down from the outer peripheral direction of the flange 9c to the outside of the bobbin receiving base 8a. There is no need to rewind the bobbin around the bobbin or to remove the yarn wound around the bobbin shaft, and it is not necessary to pay attention to the loosening of the bobbin when winding the bobbin.

Further, since the thread is not wound around the thread winding shaft, the thread is not wasted and is economical, and further, effects such as not damaging the thread winding device can be obtained.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A bobbin receiving stand 8a according to a first embodiment shown in FIG. 1 is a lightweight one formed of synthetic resin, and is fitted and supported so as to rotate integrally with a winding shaft 4a. , The conventional bobbin receiving stand 8 shown in FIG.
The diameter is larger than the outer circumference of a. A projecting portion that rises upward from the upper surface of the base 1a on an outer ring having a diameter larger than the outer periphery of the bobbin receiving stand 8a so as to surround the bobbin receiving stand 8a so that the upper end surface 10a is substantially flush with the upper end of the bobbin receiving stand 8a. 10
(Blocking means) is formed. The interval between the inner diameter of the projection 10 and the outer diameter of the bobbin receiving stand 8a is set to be within 10 mm so that the thread T wound on the bobbin 9a mounted on the bobbin receiving stand 8a is hard to fall between the both.

According to the first embodiment, the bobbin 9a
When the thread T is slackened during the winding of the thread T and the thread T connected to a thread supply source (not shown) swells to the outside of the flange 9c of the bobbin 9a, the thread T is in the state shown in FIGS. As shown in B), it is supported by the upper end surface 10a of the projection 10,
Since it does not fall below the bobbin receiving stand 8a, the thread winding shaft 4
The thread T is not wound around a.

Referring to FIG. 2, a second embodiment will be described.
The bobbin receiving stand 8a of the second embodiment has a shape different from that of the first embodiment. In particular, an inclined surface 8b (blocking means) is formed on the bobbin receiving stand 8a such that the outer peripheral diameter of the lower end is increased.

According to the second embodiment, the bobbin 9a
When the thread T is slackened during the winding of the thread T and the thread T connected to a thread supply source (not shown) swells outside the flange 9c of the bobbin 9a, the thread T is received by the inclined surface 8b and is moved to the bobbin. Due to the rotation of the bobbin at the time of winding the thread, the thread on the inclined surface 8b gradually rises along the inclined surface 8b, is wound around the shaft of the bobbin 9a again, and does not fall below the bobbin receiving stand 8a.

The third embodiment shown in FIG.
A thread receiving portion 8c is formed at the outer end of the portion a so as to extend in the outer diameter direction parallel to the base 1a as a blocking means.

In the fourth embodiment shown in FIG. 4, a thread receiving portion 8d is formed at the lower end of the outside of the bobbin receiving stand 8a as a blocking means so as to extend upward and extend in the outer diameter direction.

According to the third and fourth embodiments, the yarn T is slackened while winding the yarn on the bobbin 9a, and the yarn T connected to the yarn supply source (not shown) is outside the flange 9c of the bobbin 9a. When inflated, the thread T
c, or by the inner side surface of the thread receiving portion 8d, and does not fall below the bobbin receiving stand 8a.

The fifth embodiment shown in FIG.
a, an inclined surface 8b such that the outer peripheral diameter of the lower end is increased,
A thread receiving portion 8d continuously bent at the lower end of the inclined surface 8b so as to extend upward and in the outer diameter direction was formed.

The thread receiver 8d may be a thread receiver 8c formed parallel to the base 1a shown in FIG.

The sixth embodiment shown in FIG. 6 has a configuration in which the bobbin receiving stand 8a shown in FIG. 2 and the projection 10 having the upper end face 10a shown in FIG. 1 are combined. The seventh embodiment of FIG. 7 has a configuration in which the bobbin receiving stand 8a shown in FIG. 5 and the projection 10 having the upper end surface 10a shown in FIG. 1 are combined.

The eighth embodiment shown in FIG. 8 is a combination of the bobbin receiving stand 8a shown in FIG. 3 and the projection 10 having the upper end face 10a shown in FIG.

The ninth embodiment shown in FIG. 9 has the bobbin receiving stand 8a shown in FIG.
0a is extended in the outer radial direction, and a plate member having a protruding portion 10f formed above the upper end surface 10a and above the lower end of the inclined surface 8b of the bobbin receiving stand 8a is provided.

The tenth embodiment shown in FIG. 10 combines the bobbin receiving table 8a shown in FIG. 8 with the plate member having the protruding portion 10f shown in FIG. 9 to form the yarn receiving section 8c of the bobbin receiving table 8a.
The configuration is such that a protruding portion 10f is opposed to the upper part of the outer peripheral portion.

The eleventh embodiment shown in FIG. 11 has a configuration in which the bobbin receiving table 8a shown in FIG. 7 is combined with the plate member having the projection 10f shown in FIG. 9, and the yarn receiving section of the bobbin receiving table 8a is provided. This is a configuration in which a protruding portion 10f is opposed to the outer periphery of 8d.

In the twelfth embodiment shown in FIG. 12, an inclined surface 8b is formed at the upper end of the outer edge of the bobbin receiving stand 8a.
An outer portion 8e is formed in the outer diameter direction from the lower end of the inclined surface 8b, and has a configuration in which the outer portion 8e is formed. The thread receiving portion 10c was formed so as to extend in the outer diameter direction in parallel with the base 1a. And it is the structure which made the protrusion 10f oppose the upper part of the upper end of the outer part 8f. Therefore, according to the fifth and twelfth embodiments, the yarn T is slackened while the yarn is wound around the bobbin 9a, and the yarn T connected to the yarn supply source (not shown) is outside the flange 9c of the bobbin 9a. When inflated, this thread T
Are supported by the thread receiving portions 8c, 8d or the protruding portions 10f as blocking means, and do not fall below the bobbin receiving stand 8a.

In each of the embodiments described above, the example in which the thread winding device is installed on the upper surface of the arm of the sewing machine has been described.
It may be provided on the front or side surface of the arm of the sewing machine. In that case, the above "downward" is referred to as "direction approaching the base (base side)".
And "above" is read as "direction away from the base". In addition, although the description has been given of the embodiment in which the bobbin axis is arranged vertically, the same effect can be obtained even when the bobbin axis is horizontally or diagonally arranged. .

[0043]

As described above, according to the present invention, the yarn is loosened at the beginning of winding of the bobbin or during the winding of the yarn, and the yarn slides from the outer peripheral direction of the flange 9c of the bobbin 9a to the outside of the bobbin receiving stand 8a. Even if the thread T falls, the thread T is received by the upper end surface, the inclined surface, the thread receiving portion, the protrusion, or the like of the concave portion and does not fall below the bobbin receiving base, so that the bobbin can be securely wound, and the bobbin can be wound. This eliminates the need for rewinding and removing the thread wound around the thread winding shaft, and eliminates the need to pay attention to loosening of the thread when winding the thread, thereby improving the sewing work efficiency.

Further, since the yarn is not wound around the yarn winding shaft, the yarn is not wasted, so that it is economical, and further, there is obtained an effect that the yarn winding device is not damaged.

[Brief description of the drawings]

FIG. 1A is a longitudinal sectional view of a bobbin receiving portion according to a first embodiment of the present invention, and FIG. 1B is a schematic plan view of the bobbin receiving portion according to the first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a bobbin receiving portion according to a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a bobbin receiving portion of the first embodiment in the third embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a bobbin receiving portion according to a second embodiment of the third embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a bobbin receiving portion according to a fourth embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of a bobbin receiving portion according to a fifth embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of a bobbin receiving portion according to a sixth embodiment of the present invention.

FIG. 8 is a longitudinal sectional view of a bobbin receiving portion according to a seventh embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of a bobbin receiving portion according to an eighth embodiment of the present invention.

FIG. 10 is a longitudinal sectional view of a bobbin receiving portion according to a ninth embodiment of the present invention.

FIG. 11 is a longitudinal sectional view of a bobbin receiving portion according to a tenth embodiment of the present invention.

FIG. 12 is a longitudinal sectional view of a bobbin receiving portion according to an eleventh embodiment of the present invention.

FIG. 13 is a perspective view of a conventional thread winding device provided on the upper surface of a sewing machine arm.

FIG. 14 is an exploded perspective view of a conventional thread winding device.

FIG. 15 is a plan view of a conventional thread winding device, in which a thread winding lever is at a standby position for thread winding.

FIG. 16 is a side view of FIG. 15 in a conventional thread winding device.

FIG. 17 is a view taken along the line XX of FIG. 16 in the conventional thread winding device.

FIG. 18 is a vertical cross-sectional view of a bobbin cradle portion in a conventional thread winding device.

FIG. 19 is a plan view of a conventional thread winding device, in which a thread winding lever is at a thread winding position.

FIG. 20 is an explanatory diagram for explaining a problem of the conventional thread winding device.

FIG. 21 is a longitudinal sectional view of a bobbin receiving portion having another conventional configuration.

[Explanation of symbols]

 Reference Signs List 1 sewing machine arm 1a base 2a lever shaft 2c thread winding lever 3a shaft stand 4a thread winding shaft 5a pressing plate 6a spring 7a spring 8a bobbin receiving stand 9a bobbin 10 concave portion 10a end face 10b inclined surface 10c cylindrical portion 10d thread receiving portion 10e thread receiving portion 10e Department

Claims (6)

[Claims] 1. A cup-shaped bobbin receiving base for mounting and supporting a bobbin fitted into the bobbin shaft and mounted on the bobbin shaft protruding from a base. The bobbin is rotated by rotating the bobbin shaft. In the thread winding device of a sewing machine, when the thread wound around the bobbin swells out of the flange of the bobbin, blocking means for preventing the thread from entering the base side from the bobbin receiving stand is provided. A thread winding device for a sewing machine. 2. The apparatus according to claim 1, wherein said blocking means is a projection that rises from said base so as to surround said bobbin receiving base on an outer ring having a diameter larger than the outer periphery of said bobbin receiving base.
3. The thread winding device for a sewing machine according to claim 1. 3. The thread winding device for a sewing machine according to claim 2, wherein an upper end surface of the projection is substantially flush with an upper end of the bobbin receiving stand. 4. The bobbin receiving means is formed below the outer periphery of the bobbin mounting surface of the bobbin receiving base so that the outer diameter gradually increases toward one side in the axial direction of the bobbin shaft. 2. The thread winding device for a sewing machine according to claim 1, wherein the thread winding device is an inclined surface. 5. The bobbin mounting surface of the bobbin receiving stand so that the blocking means is bent in a direction parallel to or away from the base and the diameter of the outer periphery gradually increases as the distance from the bobbin axis increases. 2. The thread winding device for a sewing machine according to claim 1, wherein the thread winding portion is formed continuously with a lower end of the outer periphery. 6. A thread winding device for a sewing machine having the configuration according to claim 4.