JP3527776B2 - Threading device for bobbin case for half-turn kettle - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a threading device for a bobbin case for a half-turn hook, and more particularly, a device for automatically passing a bobbin thread through a thread passage hole formed at a corner of a bobbin case for a half-turn hook. Regarding

[0002]

2. Description of the Related Art Recently, in order to reduce working time and labor, a bobbin is wound on a bobbin, a bobbin thread wound on the bobbin is hooked on a bobbin case, and the bobbin case is extended from the bobbin case. Various proposals have been made for a device that automatically cuts the lower thread to be discharged.

[0003]

However, the above bobbin winding device has the following problems. That is, only the bobbin case for the full-rotary shuttle is applicable to the above-mentioned device, and when the bobbin case for the half-rotary shuttle having the corners formed on the outer circumference is used, the bobbin winding and the bobbin are wound. The bobbin thread, which is threaded on the case and extends from the bobbin thread discharge hole under the bobbin thread tension spring, must be passed through the thread passage holes formed at the corners, but this threading operation cannot be performed. There was a problem.

Therefore, according to the present invention, a bobbin thread extending from a bobbin thread discharge hole under a bobbin thread tension spring for a bobbin case for a half-turn hook can be automatically passed through a thread passage hole at a corner of the bobbin case. An object of the present invention is to provide a threading device for a bobbin case for a rotary hook.

[0005]

To achieve the above object, a threading device for a bobbin case for a half-turn hook according to a first aspect of the present invention accommodates a bobbin around which a bobbin thread is wound and has a half turn. A bobbin case for the hook and a bobbin case, which is led out from the bobbin thread derivation hole under the bobbin thread tension spring of this bobbin case and whose end is cut, is guided to one side of the thread passage hole formed at the corner. The first air means and the second air means for leading the lower thread guided to the one side to the other side through the thread hole are provided.

In order to achieve the above object, the bobbin case threading device for a half-turn hook according to claim 2 has a lower thread wound around it.
Bobbin case for a half-turn hook that accommodates a bobbin and has a corner
And the lower thread lead-out hole under the lower thread tension spring of this bobbin case.
The lower thread, which has been drawn out and whose end has been cut off, is formed at the corner.
First air means for guiding to one side of the thread thread hole, a lower thread gripping portion capable of holding and releasing the lower thread, and a lower thread gripper capable of accommodating the lower thread gripping portion and inserting the thread thread hole. Have an arm and above
Guide the bobbin thread guided to one side to the other side through the thread hole.
A lower thread gripping means for letting out is provided.

In order to achieve the above object, the threading device for a bobbin case for a half-turn hook according to a third aspect of the present invention is such that a corner of a bobbin case for a half-turn hook that accommodates a bobbin wound with a bobbin thread, A bobbin thread supplying means that is provided with a notch for opening the thread hole and a thread path cover biased outward so as to close the notch, and is drawn out from the bobbin case under thread tension spring The bobbin thread is wound around the bobbin case by rotating the bobbin case, and the bobbin case is pressed to enter the thread hole.

[0008]

According to the threading device of the bobbin case for a half-turn hook according to the present invention, the bobbin thread extending from the bobbin thread outlet hole under the bobbin case bobbin thread tension spring is angled by the first air means. The lower thread guided to one side of the yarn guide hole formed in the portion, and the lower thread guided to the one side is passed through the yarn guide hole by the second air means and led out to the other side, and the yarn guide of the corner portion is formed. Threading into the hole is performed.

According to the threading device for the bobbin case for the half-turn hook described in claim 2, the lower thread extending from the lower thread outlet hole under the lower thread tension spring of the bobbin case is angled by the first air means. The bobbin thread guided to one side of the thread guide hole formed in the portion is held by the bobbin thread gripping portion, and the bobbin thread gripping portion is stored in the bobbin thread gripping arm. When the bobbin thread gripping arm that accommodates this bobbin thread gripping portion is exposed to the other side through the thread passage hole, and the bobbin thread gripping part projects from this bobbin thread gripping arm and the bobbin thread gripping part releases the bobbin thread, Threading is performed in the thread guide hole of the section.

According to the threading device of the bobbin case for the half-turn hook according to the third aspect, the bobbin thread from the bobbin thread supply means which is led out from the bobbin thread outlet hole under the bobbin thread tension spring is The yarn guide is loosened and pressed against the yarn guide cover, the yarn guide cover is opened against the biasing force, and the yarn guide holes are inserted into the yarn guide holes at the corners for threading.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. First, a threading device for a bobbin case for a half-turn hook, a bobbin thread winding device to which the threading device is applied, and an automatic bobbin thread supplying device to which the bobbin winding device is applied will be described with reference to FIG. .

This automatic bobbin thread feeder has a pair of electromagnet attraction heads 3 and a hook 1 at a sewing position indicated by a two-dot chain line.
A bobbin that moves forward and backward while rotating synchronously between a bobbin attachment / detachment position for attaching / detaching the bobbin case 2 accommodating the bobbin 30 to the inner hook and a bobbin thread winding position for winding the bobbin thread on the bobbin. An exchanging section X and a bobbin thread winding section Z for holding the tip of a bobbin thread Y fed from a bobbin winding B as a bobbin thread supplying means and winding the bobbin thread around a bobbin 30 located at the bobbin thread winding position are provided. It is a thing.

In this automatic bobbin thread feeder, when the bobbin exchanging section X moves forward, the bobbin case 2 accommodating the bobbin 30 wound with the bobbin thread is set in the inner hook of the hook 1 in the sewing position at the bobbin attachment / detachment position. At the same time, the empty bobbin and the bobbin case 2 are set on the lower thread winding portion Z at the lower thread winding position. Further, when the bobbin exchanging section X is retracted, the bobbin 30 and the bobbin case 2 are retracted from the inner hook and the bobbin thread winding section Z at the sewing position.

Next, the bobbin thread winding device arranged in the bobbin thread winding portion Z will be described with reference to FIGS. 4 to 7.

This bobbin winding device is placed in the bobbin winding portion Z in the bobbin thread automatic feeding device shown in FIG. 8, and as shown in FIG. 4, a bobbin winding clutch 7 rotated by a motor 6, Fixed knife 8, thread take-up 9 with moving knife, thread end clamp spring 10, thread guide 11 and thread trimming clamp cam 12, thread pressing (lower thread guided to bobbin case 2 bobbin case 2 bobbin thread tension spring 2a below the lower end 2a of the lower thread leading-out hole 2f).

A thread winding device base 13 fixed to an installation plate (not shown) attached to the sewing machine frame is provided with a thread winding clutch 7 and a thread end clamp base 1 via a bearing 14.
5 are supported. The thread winding clutch 7 and the thread end clamp base 15 are concentrically arranged, the thread end clamp base 15 is stopped from rotating with respect to the thread cutting device base 13 by a thread clamp guide 16, and the thread winding clutch 7 is a thread end clamp. It is inserted in the cylinder of the base 15 so as to be rotatable and movable back and forth. Further, a clamp having a relatively strong spring force is provided between the collar 17 fixed to the end of the thread end clamp base 15 and the thread cutting device base 13, and between the thread winding clutch 7 and a coupling 23 described later. A cam spring 18 and a clutch spring 19 having a relatively weak spring force are provided. Therefore,
The thread end clamp base 15 is biased to the right side, and the thread winding clutch 7 is biased to the left side so as to be separated from the thread end clamp base 15.

The spool clutch 7 is connected to a coupling 23 fixed to the rotating shaft of the motor 6 so as to be movable back and forth. The back-and-forth movement of the spool clutch 7 is caused by the coupling 2
This is made possible by engaging the pin 23a of No. 3 with the long groove formed in the axial direction of the spool clutch 7.

The fixed knife 8 is fixed to the installation plate,
The vicinity of the cutting edge is curved in an arc shape centered on the spool clutch 7 (see FIG. 7).

The thread separator 9 with a moving knife is fixed to a sprocket 20 fixed to a bearing 14, as shown in FIG. As shown in FIG. 5, its shape is a moving knife plate 9a having a V-shaped notch 9a 'for leading a thread at its tip and a cutting eye 9a "near its trough.
A thread-dividing wing 9b having a thread-dividing edge 9b ', which is provided with a small gap for allowing the fixed knife 8 to pass therethrough and with a slightly offset edge, is provided. The moving knife plate 9a and the thread dividing wing 9b are both curved in an arc shape with the thread winding clutch 7 as the center, and when the moving knife with thread moving mechanism 9 rotates to reach the position of the fixed knife 8, Moving knife plate 9
The positional relationship is adjusted so that the eyeball 9a ″ on the back part of a is rubbed against the tip of the fixed knife 8 to pass therethrough. The sprocket 20 and the gear fixed to the shaft of a thread trimming motor (not shown) It is rotationally driven by the timing belt 21 wound around.

As shown in FIG. 4, the yarn end clamp spring 10 is composed of a coil spring that is tightly wound, and is fixed to the tip of a circumferentially extending protrusion 15a of the yarn end clamp base 15. The bobbin thread Y from the bobbin B is sandwiched and hooked at a fixed position of the thread end clamp spring 10.

The thread guide 11 is fixed to the thread end clamp base 15 via the collar 17, and moves in the axial direction together with the thread end clamp spring 10 fixed to the thread end clamp base 15 to have a moving knife. The thread separating edge 9b 'of the thread separating unit 9 assists in thread separation. In addition, the thread end clamp spring 10
The bobbin thread Y, which extends between the bobbin case 2 and the tip of the thread guide 11, passes through substantially the center of the bobbin case 2 when advanced together with the bobbin exchanging section X, and is guided to the substantially center of a notch 2c of the bobbin case 2 described later. As described above, the positional relationship of each member is set.

The thread clamp cam 12 has a shape obtained by diagonally cutting a cylinder and is fixed to the sprocket 20. On the cam surface 12a at the tip of the thread end clamp base 1,
The back surface of the protruding portion 15a of No. 5 is in contact with. The yarn clamp cam 12 rotates together with the yarn separator 9 with a moving knife to move the yarn winding clutch 7, the yarn clamp spring 10 and the yarn guide 11 forward and backward, and the end portion of the lower thread Y of the supply source after thread cutting. Is to be hung on a fixed position of the thread clamp spring 10 and to open a gap between the bobbin case 2 and the thread winding clutch 7 when the lower thread is cut.

The thread pressing member 22 is provided in the vicinity of the thread guide 11 in the same direction as the axis of the thread winding clutch 7 so as to act on the bobbin thread Y extending between the thread clamp spring 10 and the thread guide 11. There is. The thread pressing 22 can be moved forward and backward by a thread pressing air cylinder 24.

The bobbin case 2 used here is shown in FIG.
As shown in, the bobbin case for the half-turn hook has a notch 2c formed from the bobbin insertion side on the outer circumference of the case. The notch 2c is necessary to wind the bobbin thread Y around the bobbin (details will be described later). Other configurations are similar to those of a general bobbin case for a half-turn hook, and have an outwardly projecting corner portion 2d and a thread guide hole 2e formed at the end of this corner portion 2d. As shown, the lower thread tension spring 2a and the lower thread tension spring groove 2b that extends obliquely from the open end to the bottom of the lower thread tension spring 2a and the lower thread lead-out hole 2f at the end of the lower thread tension spring groove 2b are provided on the peripheral side thereof. Be prepared for the department.

Next, the bobbin thread winding operation of the bobbin thread winding device thus constructed will be described.

In the initial state shown in FIG. 6 (1), the yarn Y delivered from the bobbin B crosses the yarn guide 11 via the yarn restraining solenoid 25, as shown in FIG. 7 (1), and reaches the yarn end clamp spring. It is hooked at 10. In this state, when the bobbin case 2 and the bobbin move forward together with the bobbin exchanging section X (moves to the right in FIG. 6), the yarn Y is pinched between the bobbin and the yarn winding clutch 7. Furthermore, when the bobbin case 2 and the bobbin move forward together with the bobbin exchange section X,
The yarn Y touches the edge of the bobbin flange and is guided so that the mouth end of the yarn guide 11 is located at the center side of the opening 2c of the bobbin case 2, and the bobbin and the yarn winding clutch 7 are frictionally engaged (see FIG. )reference). After that, when the motor 6 rotates and the bobbin rotates via the thread winding clutch 7, the thread Y is guided to the thread winding portion of the bobbin so as to straddle the bobbin flange, and is wound on the bobbin.

FIG. 7 (1) shows an initial state after the winding of the yarn Y is completed. When the moving knife with moving knife 9 is operated in this state, the yarn Y is guided to the outside of the bobbin flange through the gap between the bobbin case 2 and the bobbin (see FIG. 7 (2)). When the bobbin case 2 further advances toward the bobbin winding clutch 7 side together with the bobbin exchanging section X while the yarn Y is at the entrance of the lower thread tension spring groove 2b of the bobbin case 2, the yarn Y reaches the central portion of the lower thread tension spring groove 2b. You will be guided (Fig. 6 (3), Fig. 7
(3)). At that time, a slight torque is applied to the motor 6, and at the same time, the thread restraining solenoid 24 operates. Thereafter, the thread separator 9 with the moving knife is reversed, and the thread Y is in a tensioned state as shown in FIG. 7 (4). Thread press in that state 2
When 2 operates, the yarn Y is drawn out from the lower thread lead-out hole 2f below the lower thread tension spring 2a, and is held by the lower thread tension spring 2a (see FIG. 6 (4)). Then, when the thread separator 9 with the moving knife rotates forward again (see FIG. 7 (5)), the thread Y is guided by the thread end clamp spring 10 and hung, and the thread is stretched with the thread guide 11. Therefore, the yarn Y is held between the bobbin and the yarn winding clutch 7 (see FIG. 7 (6)). Immediately after that, the yarn Y is sandwiched between the moving knife plate 9a of the thread separating device 9 with the moving knife and the fixed knife 8 and cut (FIGS. 6 (5) and 7 (7)).
reference). Therefore, the bobbin thread tension spring 2 in the bobbin case 2 is
The thread end is pulled out from a by about 3 cm and cutting is performed, so that it is possible to satisfactorily form a stitch by entanglement with the upper thread.

In FIG. 6, the corners 2d on the bobbin case 2 for the half-turn hook are omitted in order to avoid complication of the drawing.

By the way, the bobbin thread winding device is provided with a threading device for a bobbin case for a half-turn hook, which is a feature of the present invention as shown in FIG. This bobbin threading device has a bobbin 3 in which a bobbin thread is wound by the bobbin thread winding device.
No. 0, and the lower thread Y, which is drawn from the lower thread discharge hole 2f below the lower thread tension spring 2a of the bobbin case 2 and whose end is cut, has a corner 2d protruding from the half-turn hook bobbin case 2. An air nozzle A for blowing, which serves as a first air unit that is guided to one side of the yarn passage hole 2e, and is arranged on the other side of the yarn passage hole 2e.
It is composed of a vacuum air nozzle C as a second air means whose axis coincides with the axis of the yarn guide hole 2d and has a small-diameter suction port.

Therefore, the bobbin thread Y, which is cut at its end and extends from the bobbin thread outlet hole 2f under the bobbin thread tension spring 2a of the bobbin case 2, is actuated by the air nozzle A for blowing, and the thread path of the corner portion 2d. It is guided to one side of the hole 2e. The lower yarn Y guided to this one side is sucked and passed through the yarn passage hole 2e by the operation of the vacuum air nozzle C. And
The lower thread Y is led out to the other side of the thread guide hole 2e, and the threading of the corner 2d into the thread guide hole 2e is completed.

As described above, in the first embodiment, the bobbin case 2 is wound and threaded by the bobbin winding device, and the bobbin and bobbin case 2 in which the bobbin thread has been cut are compared with the bobbin case 2 bobbin thread. The bobbin thread, which is led out from the bobbin thread delivery hole 2f under the tension spring 2a and whose end is cut, can be automatically passed through the thread passage hole 2e of the corner portion 2d of the bobbin case 2.

FIG. 2 is a schematic configuration diagram of a threading device for a bobbin case for a half-rotary shuttle showing a second embodiment of the present invention.

In the threading device of the second embodiment, the bobbin thread Y, which is led out from the bobbin thread delivery hole 2f under the bobbin case tension spring 2a and whose end is cut, is blown up from below. A pair of blown air nozzles A, A as first air means which are approximately upright so as to intersect with the extension of the axis of 2e, and a bobbin thread gripping means arranged on the other side of the thread guide hole 2e. And 51.

The lower thread gripping means 51 is composed of a lower thread gripping portion 50a and a lower thread gripping arm 50 whose axis coincides with the axis of the thread passage hole 2d. The lower thread gripping portion 50a is made of a plurality of thin wire-like members having a bent front end, and the lower thread Y can be released and held by opening and closing the front end. The lower thread gripping arm 50 is capable of accommodating the lower thread gripping section 50a in a state where the lower thread gripping section 50a is closed.
The thread guide hole 2e can be inserted while a is stored.

Therefore, the bobbin thread Y whose end is cut and extends from the bobbin thread outlet hole 2f under the bobbin thread tension spring 2a of the bobbin case 2 is actuated by the blowing air nozzles A, A.
It is blown up from below and stands upright so as to intersect with the extension line of the axis of the thread guide hole 2e. At this time, the lower thread grip portion 50
The lower thread gripping arm 50 accommodating a is exposed to one side (right side through the corner 2d in the figure) through the thread guide hole 2e, and the lower thread gripping section 50a protrudes from the lower thread gripping arm 50 and the front end thereof is exposed. By performing the closing operation of the section, the upright bobbin thread Y is held by the bobbin thread gripping section 50a. Then, the bobbin thread gripping arm 50 stores the bobbin thread gripping portion 50a holding the bobbin thread Y, the bobbin thread gripping arm 50 returns to the other side through the thread passage hole 2e, and is moved downward from the bobbin thread gripping arm 50. When the thread gripping portion 50a protrudes and the leading end portion performs the opening operation, the lower thread Y is released, and the thread passage hole 2e of the corner portion 2d is released.
Threading is completed.

As described above, also in the second embodiment, the bobbin and bobbin case 2 on which the bobbin case 2 is wound and threaded by the bobbin winding device and further cut off the bobbin case are used. The bobbin thread, which is led out from the bobbin thread delivery hole 2f under the tension spring 2a and whose end portion is cut, can be automatically passed through the thread passage hole 2e of the corner portion 2d of the bobbin case 2.

The air nozzle A for blowing in the first embodiment is arranged below as in the second embodiment, and the lower thread Y
May be blown up and guided to one side of the yarn path hole 2e of the corner portion 2d. Further, the air nozzle A for blowing is replaced with the air nozzle C for vacuum, and is arranged above, and the lower thread Y
May be sucked up and guided to one side of the yarn path hole 2e of the corner portion 2d. In addition, the blow air nozzle A is
As in the embodiment, the lower yarn Y is blown upward and the vacuum air nozzle C is used as a blow air nozzle and is placed at the position of the blow air nozzle A shown in the first embodiment. Bobbin thread Y that is installed and blown up
May be blown out so as to pass through the yarn path hole 2e of the corner portion 2d.

Further, the blowing air nozzles A, A in the second embodiment may be three or more. Further, the air nozzles A, A for blowing are arranged laterally as in the first embodiment, and the lower yarn Y is blown toward one side of the yarn passage hole 2e of the corner 2d, and the lower yarn is You may make it cross | intersect on the extension line of the axial center of the thread guide hole 2e. Alternatively, the blowing air nozzles A, A may be arranged above instead of the vacuum air nozzles, and the lower thread Y may be sucked up to stand upright.

As described above, the blowing of the air means, the selection of the vacuum, the combination, and the arrangement position thereof in the first and second embodiments can be appropriately changed.

Further, the lower thread gripping means 5 in the second embodiment.
1 is disposed on one side (on the right side through the corner 2d in the figure), and threading is performed by a series of operations of holding the lower thread, passing the thread guide hole, releasing the lower thread, and retracting to the original position. May be.

Next, a threading device for a bobbin case for a half-turn hook according to a third embodiment of the present invention will be described with reference to FIGS. 9 to 11.

In the third embodiment, the corner portion 2d of the bobbin case 2 for the half-turn hook is changed. That is, as shown in FIG. 9, the corner 2d of the bobbin case 2 is provided with a notch 2h that opens the yarn path hole 2e and a yarn path cover 60 that closes the notch 2h. The yarn path cover 60 is made of a material having a spring property, and its end is fixed to the corner 2d by a screw 61. Further, the yarn path cover 60 is pressed outward by the pin 2g, and in this state, the tip end portion is in a state of closing the notch 2h.

The other configurations of the bobbin 30 and the bobbin case 2 are the same as those described in each of the above-described embodiments, and therefore the description thereof is omitted here.

In addition, in the third embodiment, the bobbin thread winding device described in each of the above embodiments is also modified, and instead of the thread separating device with the moving knife shown in FIG. Figure 10
The thread separator 9 with a moving knife shown in FIG.

The thread separator 9 with the moving knife is constructed by turning the moving knife plate 9a and the thread dividing blade 9b shown in FIG. 5 upside down, and is further connected to the thread dividing edge 9b 'of the thread dividing blade 9b. To form a V-shaped notch 9b ", and the thread-dividing wing 9b is formed.
9a ′ of the moving knife plate 9a and the notch 9b ″ of the moving knife plate 9a are displaced from each other in the front-back direction of the bobbin case 2.
9b ″ is arranged. And, FIG. 7 (2), (3)
When the thread is separated as shown in FIG.
b "and the thread is not applied to the cut portion 9a 'of the moving knife plate 9a, while the cut portion 9b" of the thread separating blade 9b "is provided when the thread is separated as shown in Figs. 11 (5) to (7). The thread is not hooked on the thread, and the thread is hooked on the notch 9a 'of the moving knife plate 9a.

Because of the construction of the thread separating device 9 with a moving knife as shown in FIG. 10, since the eyeball 9a "for cutting the lower thread is arranged on the outermost peripheral surface, it cooperates with this eyeball 9a". The fixed knife 8 for cutting the lower thread is arranged further outward than that described in the previous embodiment. Note that other configurations of the bobbin winding device are the same as those described in each of the above-described embodiments, and thus the description thereof is omitted here.

Next, the operation of the apparatus thus configured will be described. The thread winding on the bobbin 30 and the thread hooking of the lower thread Y wound on the bobbin 30 on the bobbin case 2 are performed in exactly the same manner as in FIGS. 7 (1) to 7 (4) described in the previous embodiment. . The thread handling shown in FIGS. 7 (2) and 7 (3) is performed by the notch 9b ″ of the thread dividing wing 9b shown in FIG.

Then, as shown in FIG. 7 (4), the lower thread Y
Is fed out from the lower thread tension hole 2f below the lower thread tension spring 2a, and is clamped by the lower thread tension spring 2a, when the thread take-up unit 9 with the moving knife is rotated in the forward direction again, the notch 9a of the moving knife plate 9a is cut. 11 '(see Fig. 11 (5)), and when the yarn separator with the moving knife further rotates in the forward direction with this yarn hanging,
As shown in (6), the bobbin thread Y hooked on the notch 9a ′ presses the yarn path cover 60, and the yarn path cover 60
Is pushed and bent around the pin 2g as a fulcrum, and the lower thread Y enters the thread hole 2e. That is, the lower thread Y is the thread hole 2e.
Has been passed through. Then, when the thread separator 9 with the moving knife further rotates forward, the lower thread Y is sandwiched between the moving knife plate 9a of the thread separator 9 with the moving knife and the fixed knife 8 as shown in FIG. 11 (7). Then, the lower thread Y is cut.

As described above, in the third embodiment, the bobbin thread before being cut is wound and threaded by the bobbin thread winding device and led out from the bobbin thread leading hole 2f below the bobbin thread tension spring 2a of the bobbin case 2. Can be automatically passed through the thread guide hole 2e of the corner portion 2d of the bobbin case 2.
Then, the lower thread passed through the thread passage hole 2e can be automatically cut.

The invention made by the present inventor has been specifically described based on the embodiments, but the invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say, for example, the bobbin winding device is not limited to those of the above-mentioned embodiments, and the point is that the bobbin winding and thread hooking and the bobbin thread cutting are automatically performed. , It does not matter.

[0051]

As described above, according to the threading device for the bobbin case for the half-turn hook, the bobbin case for the half-turn hook, the lower thread of the bobbin case for the half-turn hook is led out. The bobbin thread extending from the hole can be automatically passed through the thread passage hole at the corner of the bobbin case.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a threading device for a bobbin case for a half-rotary hook according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a threading device for a bobbin case for a half-turn hook showing a second embodiment of the present invention.

FIG. 3 is a schematic perspective view of a bobbin case for a half-turn hook used in the first and second embodiments.

FIG. 4 is a partial cross-sectional plan view of a lower thread winding device to which the threading device for the bobbin case for the half-turn hook of the first and second embodiments is applied.

FIG. 5 is a perspective view of a thread separator with a moving knife used in the same upper and lower thread winding device.

FIG. 6 is a side view of the bobbin thread winding device showing each operation of the same upper and lower thread winding device.

FIG. 7 is a front view of the bobbin thread winding device showing each operation of the same upper and lower thread winding device.

FIG. 8 is a side view showing an outline of an automatic bobbin thread feeder to which the same upper and lower thread winding device is applied.

FIG. 9 is an enlarged view of a corner portion of the bobbin case for the half-turn hook used in the third embodiment of the present invention.

FIG. 10 is a perspective view of a thread separator with a moving knife used in a bobbin thread winding device according to a third embodiment.

FIG. 11 is a front view of the bobbin winding device showing only the operation different from that of FIG. 7 in each operation of the bobbin winding device of the third embodiment.

[Explanation of symbols]

2 bobbin case 2a bobbin thread tension spring 2d corner 2e Thread hole 2f bobbin thread exit hole 2h notch 9 Thread handling 30 bobbins 50 Lower thread gripping arm 50a Lower thread gripping section 51 Bobbin thread gripping means 60 thread road cover A first air means B Lower thread supply means C second air means Y bobbin thread

Claims (3)

(57) [Claims] 1. A bobbin case for a half-rotary hook that accommodates a bobbin around which a bobbin thread is wound, and a bobbin case, which is drawn out from a bobbin thread outlet hole under a bobbin thread tension spring and whose end is cut. A first air means for guiding the formed lower thread to one side of the thread hole formed in the corner, and a first air means for guiding the lower thread guided to the one side to the other side through the thread hole. A threading device for a bobbin case for a half-turn hook, which is provided with 2 air means. 2. A bobbin around which a bobbin thread is wound is accommodated and a corner portion is
The bobbin case for the half-turn hook and the bobbin case are guided through the bobbin case under the bobbin thread tension spring.
A bobbin thread whose leading end is cut, and a thread formed at the corner
A first air means for introducing one side of Michiana, and lower thread gripping portion capable of holding and release the lower thread, and a retractable and gripper arms lower thread capable inserted yarn path hole the lower thread gripping portion Existence
The lower thread guided to the one side through the thread hole
A threading device for a bobbin case for a half-turn hook , which is provided with a lower thread gripping means to be pulled out to one side . 3. A bobbin case for a semi-revolving hook for accommodating a bobbin wound with a bobbin thread, a notch for opening a thread passage hole, and a thread urged outward so as to close the notch. A bobbin cover is provided, and a bobbin thread from a bobbin thread supply means that is led out from a bobbin thread lead-out hole under the bobbin case tension spring is loosened by rotating around the bobbin case, and A threading device for a bobbin case for a half-rotary hook, which is equipped with a thread separator that presses a road cover to enter the thread hole.