KR19990072631A - Rotary shuttle device - Google Patents

Abstract

Providing a rotary shuttle device that can prevent excessive tension from acting when the weft loop exits the drum without using a "book opener" which is complicated and has a problem of high noise. do. In the rotating drum device of the sewing machine, an outer drum 10 integrally rotating with the drum shaft 20, an inner drum 30 attached to the outer drum 10, and an inner drum 30. And a regulating member for regulating the rotation of the inner drum 30 by contacting the engaging portion 34 formed therein, and the center axis P of the outer drum 10 and the drum shaft 20 of the drum shaft 20. The inner axis 30 is oscillated so that the rotation axis Q is eccentric and the inner drum 30 is moved up, down, left and right every one rotation of the outer drum 10.

Description

Rotary Book Device {ROTARY SHUTTLE DEVICE}

The present invention relates to a rotary shuttle device for a sewing machine attached so that an outer drum and an inner drum can rotate relatively.

As this kind of rotary book apparatus, the technique as shown in FIG. 7 is known. In this technique, an outer drum 70 fixed to a drum shaft 72 that rotates in synchronism with a lifting operation of a sewing needle (not shown), and rotatably mounted with respect to the inside of the outer drum 70. An inner drum 74 is provided, and a bobbin case (not shown) of a bobbin bobbin is set inside the inner drum 74. Moreover, the center axis line of each of the outer drum 70 and the inner drum 74 and the rotation axis of the drum shaft 72 are both coincident with each other. Moreover, the engaging part 76 is formed in the peripheral part of the front side in the inner drum 74, and the projection 82 of the drum support part 80 is located in this engaging part 76. As shown in FIG.

In the rotary book apparatus shown in FIG. 7, when the outer drum 70 rotates in the direction of the arrow R integrally with the drum shaft 72 when the sewing machine is driven, the outer drum (the outer drum 74) The force to rotate in the same direction by friction with 70) always acts. For this reason, in the inner book 74 at the time of the drive of the sewing machine, the wall 76a of one side of the engaging portion 76 is always kept in contact with the projection 82 of the book support 80. Therefore, when the upper chamber loop (not shown) captured by the tip of the outer drum 70 and passing around the inner drum 74 passes through between the engaging portion 76 and the protrusion 82 and exits upward. This tension is applied to the loop of the upper thread, which causes the thread to be cut.

In some cases, a mechanism called a "book opener" is used as a means to prevent this. This mechanism serves to create a gap between the engaging portion 76 and the projection 82 by forcibly rotating the inner drum 74 in the opposite direction to the arrow R in FIG. 7 at the timing of exiting the weft loop. do. As a result, such tension is not applied to the weft loop.

However, in the case of using the "book opener", a complicated mechanism including a cam mechanism or the like is required to operate it at the same timing as above, and maintenance problems remain. In addition, a large impact sound is generated by the operation of the "book opener", and as a result, the noise of the sewing machine increases, leaving a problem in the working environment.

An object of the present invention is to provide a rotary book apparatus capable of preventing excessive tension from acting when the weft loop exits the drum without using a "book opener" having a problem that the mechanism is complicated and the noise is high. To provide.

Invention of Claim 1 restrict | regulates rotation of this inner drum by contacting the outer drum which integrally rotates with a drum shaft, the inner drum attached so that it may rotate with respect to an outer drum, and the engaging part formed in the inner drum. In addition, the center axis of the outer drum and the axis of rotation of the drum axis is eccentric so that the inner drum swings up, down, left and right every one rotation of the outer drum.

As the inner drum swings in conjunction with the rotation of the outer drum as described above, a gap for exiting the weft loop occurs between the engaging portion of the inner drum and the regulating member, and an excessive tension acts on the weft loop. Can be prevented. Therefore, one cause of thread cutting can be eliminated without using a complicated and noisy "book opener".

In the invention according to claim 2, in the rotation book apparatus according to claim 1, the eccentric direction of the center axis line of the outer drum and the rotation axis of the drum axis is a direction in which the rotation axis is close to the tip side for trapping the stomach thread of the outer drum from the center axis line. Is set.

Thereby, it becomes possible to suitably match the timing which a gap generate | occur | produces between the said engaging part and the regulating member, and the timing which a weft loop exits from a drum in one rotation of an outer drum.

In the invention according to claim 3, in the rotary book apparatus according to claim 1 or 2, the axis of the mounting hole of the outer drum coupled to the drum shaft is eccentric with respect to the central axis of the outer drum.

According to the present invention, the above object can be attained only by conducting a simple study that the axis of the mounting hole is eccentric with respect to the center axis of the outer drum on the outer drum side.

In the invention according to claim 4, in the rotary book apparatus according to claim 1 or 2, the axis of the mounting hole of the outer drum coincides with the center axis of the outer drum, while the coupling shaft portion of the drum shaft coupled to the mounting hole is Eccentric from the axis of rotation of the drum shaft.

In this case, by studying that the coupling shaft portion is formed on the north shaft side, the book itself can be used as in the past.

1 is a front view of a rotary book device according to the present invention,

2 is a rear view of the same rotary book apparatus;

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a front view showing a state in which the rotary book device is opened;

5 is an explanatory diagram showing a timing chart of a rotary book device, needle bar and balance;

6 is a sectional view corresponding to FIG. 3 of the rotary book apparatus of the second embodiment;

7 is a front view of a conventional rotary book apparatus.

Explanation of symbols for the main parts of the drawings

10: outside drum 20, 22: drum shaft

30: inner drum 34: coupling portion

40: drum support 42: projection

Hereinafter, the Example of this invention is described.

Example 1

1 is a front view of the vertical rotary book apparatus, FIG. 2 is a rear view of the same vertical rotary book apparatus, and FIG. 3 is a cross-sectional view taken along the line A-A of FIG. As shown in these figures, the inner drum 30 is attached to the inside of the outer drum 10 so that the inner drum 30 can rotate relatively. The mounting hole 14 is formed in the boss 12 integrally formed in the back side of this outer drum 10. As shown in FIG. The end of the drum shaft 20 which is rotated in synchronism with the lifting and lowering operation of the needle bar (not shown) at the time of driving the sewing machine is inserted into the mounting hole 14 and is integral with the boss 12. Are combined. Moreover, the tip part 16 for capturing the upper thread loop is formed in the peripheral part of the front side in the outer drum 10. As shown in FIG.

On the other hand, at the center of the inner drum 30, a stud 32 for supporting a bobbin case (not shown) in which the bobbin bobbin is rotatably received is integrally formed. The axis of this stud 32 and the center axis P of the outer drum 10 are concentric, and the center axis P and the rotation axis Q of the drum shaft 20 are referenced to each other. Eccentric as much as (x). In the present embodiment, the mounting hole 14 is formed at a position in which the axis line (that is, the rotation axis Q of the drum shaft 20) is eccentric with respect to the center axis P by the reference numeral x. have. In addition, the amount of eccentricity x is set to about 0.25 mm specifically, and the eccentric direction is such that the rotation axis Q is close to the tip 16 side of the outer drum 10 from the center axis P. Direction.

4 is a front view showing a state in which the vertical rotary book device is opened. As is apparent from this drawing, the engaging portion 34 having a shape cut out from the outer circumference to the inner circumference is formed at the peripheral edge of the front side in the inner drum 30. About this engaging part 34, the projection 42 of the book support part 40 fixed to the floating part of the sewing machine is coupled with the predetermined direction to the rotation direction of the inner book 30. As shown in FIG.

When the outer drum 10 rotates in the direction of the arrow R of FIG. 4 by the drum shaft 20 when the sewing machine is driven, the inner drum 30 is in the same direction due to friction between the outer drum 10 and the outer drum 10. Although it rotates together, the wall 34a of one side of the said engaging part 34 is prevented from rotating in the state which contacted the protrusion 42 of the book support part 40. As shown in FIG. Therefore, the protrusion 42 of this book support part 40 comprises the "regulator member" which restricts the rotation of the inner drum 30.

5 is an explanatory diagram showing a timing chart of a vertical rotary book apparatus together with a timing chart of needle bar and balance. The operation of the rotary book apparatus is mainly described with reference to FIG. 5. The horizontal axis of FIG. 5 is the rotation angle of the sewing machine main shaft, the needle bar is reciprocated by one rotation of the sewing machine main axis, and the top dead center of the needle bar is the rotation angle of the sewing machine main axis 0 °. On the other hand, the outer drum 10 of the rotary drum device rotates two times during one round trip of the needle bar (one revolution of the sewing machine spindle). When the sewing machine spindle is rotated 20 degrees further from the bottom dead center of the needle bar, since the tip 16 of the outer drum 10 reaches the top dead center and is set to capture the upper thread loop, the outer drum 10 The phase is delayed by about 20 degrees due to the rotation angle of the sewing machine spindle.

As described above, since the center axis P of the outer drum 10 and the rotation axis Q of the drum shaft 20 are eccentric, the outer drum 10 driven by the drum shaft 20 is shaken with the core. In this state, the inner drum 30 oscillates up, down, left, and right every one rotation of the outer drum 10. By this movement, a gap is formed between the wall 34a of one side of the engaging portion 34 and the projection 42 of the book support portion 40 from the rotation angle a to b of the sewing machine main shaft shown in FIG. This operation is also performed between the rotation angles c to d of the sewing machine main shaft shown in Fig. 5, but this is not used.

The rotation angle a is around 344 °, and the rotation angle b is around 50 °. In addition, the timing at which the upper thread loop passes between the coupling part 34 and the protrusion 42 and exits upward is somewhat changed by the setting of the balance operation, but in FIG. 5, it is near 10 ° from the rotation angle of the sewing machine spindle. (Nearly beyond the tip top dead center). Since this timing is in the range of rotation angle a to b, there is a gap between the wall 34a on one side of the engaging portion 34 and the projection 42 as shown in Fig. 4, and the upper thread loop has no resistance. It can be pulled out without one of the causes of thread cutting.

Example 2

FIG. 6 is a sectional view corresponding to FIG. 3 showing the vertical rotary book apparatus of Embodiment 2. FIG. As shown in this figure, in this embodiment, the axis of the mounting hole 15 formed in the boss 12 of the outer drum 10 is made concentric with the central axis P of the outer drum 10. The drum itself is doing as before. On the other hand, at the edge part of the drum shaft 22, the coupling shaft part 24 which eccentrically moved away from the axis line (rotation axis Q) of this drum shaft 22 is formed. This coupling shaft portion 24 is inserted into the mounting hole 15 and is integrally engaged with the boss 12.

As a result, the center axis P of the outer drum 10 and the rotation axis Q of the drum shaft 22 are eccentric by x as in the first embodiment by studying on the drum shaft 22 side. In addition, since the eccentric amount x and the eccentric direction are the same as those in the first embodiment, the vertical rotary book apparatus of the second embodiment therefore functions in the same manner as in the first embodiment.

The present invention can prevent excessive tension from acting when the weft loop exits the drum without using a book opener having a problem that the mechanism is complicated and the noise is high.

Claims (4)

In the rotary book device, The outer drum which is integrally rotated with the drum shaft, the inner drum attached to rotate relative to the outer drum, and the engaging portion formed in the inner drum contact each other, thereby including a regulating member for regulating the rotation of the inner drum. And the center axis of the outer drum and the rotation axis of the drum axis are eccentric so that the inner drum swings up, down, left, and right every one rotation of the outer drum. Rotary drum device. The method of claim 1, The eccentric direction of the central axis of the outer drum and the rotation axis of the drum axis is set in a direction in which this rotation axis approaches the tip portion side for trapping the gastric thread of the outer drum from the central axis. Rotary drum device. The method according to claim 1 or 2, The axis of the mounting hole of the outer drum coupled to the drum axis is eccentric with respect to the center axis of the outer drum. Rotary drum device. The method according to claim 1 or 2, While the axis of the mounting hole of the outer drum coincides with the center axis of the outer drum, the engaging shaft portion of the drum shaft coupled to the mounting hole is eccentric from the rotation axis of the drum shaft. Rotary drum device.