JPH08155178A - Bobbin thread winding device of sewing machine - Google Patents

Abstract

PURPOSE: To maintain the quality of stitch and suppress the costs without modifying the construction of a bobbin and/or bobbin case substantially by generating a stitch of good workmanship without leaving the thread end at starting of winding to outside the bobbin case after the winding is finished, and nullifying the risk of occurrence of the needle thread to be severed. CONSTITUTION: A bobbin 7 is separated from a bobbin case of conventional construction using a bobbin separating/coupling means, and a bobbin thread 150 is clamped by thread clamping means 103, 105, 110, and in this condition, a rotor 306a is rotated so that the clamped bobbin thread 150 is entangled with the bobbin 7 which is separated from the bobbin case. Then the take-up shaft 107 is rotated, and the bobbin thread 150 is wound on the bobbin 7 while the clamped bobbin thread 150 is released, and even if the bobbin 7 is accommodated in the bobbin case after winding of bobbin thread, there is no risk that the thread end at starting of winding is left outside the bobbin case.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for winding a bobbin on a bobbin.

[0002]

2. Description of the Related Art In a conventional lockstitch sewing machine, when the bobbin thread wound around a bobbin is used up, the bobbin is removed from the hook together with the bobbin case, the bobbin is wound around the bobbin, and the bobbin is reattached to the hook. However, or the work such as replacing with a bobbin wound with a bobbin that has been prepared in advance was done, but the applicant filed earlier because the work requires a lot of time and labor. In the specification of Japanese Patent Application No. 4-188688, the bobbin is automatically wound, and the bobbin case is also automatically threaded. Further, the bobbin thread is cut and the bobbin thread derived from the bobbin case is cut. We are proposing an automatic device.

[0003]

However, the apparatus described in Japanese Patent Application No. 4-188688 has the following problems. That is, in the above apparatus, the bobbin and the bobbin winding clutch are wound around the bobbin and the bobbin winding clutch by rotating the bobbin and the bobbin winding clutch by the rotation of the motor. To be
During the rotation, the bobbin and the bobbin winding cannot clamp the bobbin thread at the beginning of the winding, so that the thread end at the beginning of the winding that was being clamped remains outside the bobbin case after the winding.
If the lock stitch is performed in this state, the winding start thread remaining outside the bobbin case may become entangled or caught in the gap between the bobbin case, resulting in poor stitch formation. There was a problem that occurred.

Further, in the above apparatus, a special shape different from the conventional bobbin and bobbin case must be used. However, the use of such a bobbin and bobbin case has a long history. There is a problem in that the quality cannot be maintained because the quality of the sewn up is affected and the bobbin and the bobbin case are processed, resulting in high cost.

Further, in the above device, the bobbin thread is wound from the processed thread drawing port of the bobbin case, but this thread drawing port is relatively small in view of the engagement with the bobbin thread tension spring. Therefore, there is a problem that the bobbin is wound on the bobbin while being biased.

Therefore, in the present invention, a good seam can be formed without the yarn end at the beginning of winding remaining outside the bobbin case after the completion of winding, and there is no fear of occurrence of upper thread breakage, and the bobbin and the bobbin case have no problem. Alternatively, it is a first object of the present invention to provide a bobbin thread winding device for a sewing machine in which the sewing quality is maintained and the cost is reduced with almost no change.

In addition to the first object, the present invention has a second object to provide a bobbin thread winding device for a sewing machine which can neatly and neatly wind a bobbin thread around a bobbin. And

[0008]

In order to achieve the above-mentioned first object, the bobbin winding device for a sewing machine according to claim 1 is capable of separating and connecting a bobbin from a bobbin case.
The bobbin thread clamped by the thread clamp means is rotated with respect to the coupling means, the thread clamp means capable of clamping and releasing the bobbin thread, and the bobbin separated from the bobbin case by the bobbin separating / coupling means. By rotating the bobbin in which the lower thread is entwined and the bobbin in which the lower thread is entangled, the lower thread clamped by the thread clamping means is released and the lower thread can be wound around the bobbin. And a take-up shaft.

In order to achieve the second object, the bobbin thread winding device of a sewing machine according to a second aspect of the present invention is the same as that of the first aspect of the invention.
A reciprocating means was provided for reciprocating the winding shaft in the axial direction when the winding shaft was rotated.

[0010]

According to the bobbin winding device of the sewing machine of the first aspect, the bobbin is separated from the bobbin case by the bobbin separating / coupling means and the bobbin thread is clamped by the thread clamping means. When the moving body rotates, the bobbin thread clamped by the thread clamping means is entangled with the bobbin separated from the bobbin case by the bobbin separating / coupling means, and the winding shaft rotates to clamp the bobbin thread clamped by the thread clamping means. The lower thread is wound around the bobbin while the thread is opened. Therefore, even if the bobbin is accommodated in the bobbin case after the bobbin winding, the yarn end at the beginning of winding does not remain outside the bobbin case. Further, the winding is performed without changing the bobbin and the bobbin case at all or almost.

According to the bobbin thread winding device of the second aspect of the invention, the reciprocating means causes the take-up shaft to reciprocate in the axial direction when rotating, and the bobbin also reciprocates in the axial direction.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. First, with reference to FIG. 22 to FIG. 26, an outline of an automatic bobbin thread feeder which employs the bobbin thread winding device of the sewing machine of the present invention will be described.

This automatic bobbin thread feeder is provided with a sewing machine bed 1.
Is placed in the space where the bottom below is an oil reservoir,
As shown in FIGS. 22 and 23, the bobbin case attaching / detaching position A, the residual thread removing position B, and the bobbin thread winding position C are arranged at 120 ° intervals around one axis, and as shown in FIGS. 22 to 24. , Bobbin case attachment / detachment position A and other work positions B, C
Is divided into both ends of the one shaft, and is composed of a pillar 2 erected in the space, a main base 3 mounted on the pillar 2, and the one shaft horizontally supported by the main base 3. A certain guide shaft 4 and a rotating arm 5 supported so as to be rotatable with the guide shaft 4 and slidable in the axial direction.
And a forward / backward lever 6 for moving the rotating arm 5 forward and backward along the guide shaft 4, and a rotating arm 5 in units of 60 °.
And a drive device for rotating in the normal direction or the reverse direction.

As shown in FIG. 25, the guide shaft 4 is rotatably supported by the standing portion of the main base 3 at both ends. As shown in FIG. 26, the cross section is non-circular, and the shape of the hole of the corresponding boss 5a of the rotating arm 5 is also the same. Therefore, the rotating arm 5 can slide along the guide shaft 4 and can rotate together with the guide shaft 4.

As shown in FIG. 22, the rotating arm 5 extends symmetrically from the center to both sides with a slight bending, and bobbins 7 are built in near each end as shown in FIG. The bobbin case 8 is detachably supported. As a bobbin attachment / detachment mechanism for the rotating arm 5, for example, Japanese Patent Application No. 5-116363 previously filed by the present applicant and already published.
The lever claw type described in the bobbin changing device of the sewing machine of the specification is adopted.

This lever claw type bobbin attaching / detaching mechanism is
For example, by rotating the lever claw with an air cylinder, the lock lever 8X of the bobbin case 8 (see FIGS. 4 and 1).
1 and FIG. 14) can be opened and closed, and the bobbin case 8 can be opened by opening the lock lever 8X.
By locking the bobbin 7 and holding the bobbin case 8 and closing the lock lever 8X, the lock of the bobbin case 8 with respect to the bobbin 7 is released and the bobbin case 8 and the bobbin 7 are opposed to each other (for example, a hook). 16). Instead of this lever claw type, for example, a lower thread automatic feeder of Japanese Patent Laid-Open No. 5-192476 or Japanese Patent Application No. 5-121 previously filed by the present applicant.
You may use the electromagnet adsorption head described in the bobbin exchange apparatus of the sewing machine of specification 960.

The forward / reverse lever 6 is rotatably supported by a shaft 9 provided upright on the main base 3, as shown in FIGS. A long hole 6a is formed near the free end. The other end is rotatably attached to a shaft 13 fixed to a knuckle 12 at the rod tip of an air cylinder 11 attached to the main base 3 by a support plate 10. Then, as shown in FIGS. 25 and 26, the rotation arm 5 is inserted into the long hole 6a of the forward / backward movement lever 6.
Of the collar 14 rotatably attached to the boss 5a of
A pin 15 protruding from the surface is engaged. Therefore, when the rod of the air cylinder 11 expands and contracts, the forward-backward movement lever 6 moves forward and backward about the shaft 9. Accordingly, the rotating arm 5 moves forward and backward along the guide shaft 4 via the pin 15 that engages with the long hole 6a of the forward-reverse lever 6.
That is, the rotating arm 5 is the same as the rotary hook 1 shown in FIGS.
The bobbin case attachment / detachment position A side, which is the sewing position where 6 is provided, and the opposite side (there is the residual thread removing position B and the bobbin thread winding position C) can be moved forward and backward along the guide shaft 4. it can.

The rotary drive device for the rotary arm 5 is shown in FIG.
As shown in FIG. 24, the motor 19 attached to the bracket 18 fixed to the bracket 17 below the main base 3, and the gear 21 fixed to the rotating shaft 20 thereof.
And a gear wheel 22 rotatably supported by the bracket 17 and meshing with the gear wheel 21, an original wheel 23 fixed to one surface of the gear wheel 22, a pin 24, and a driven wheel 25 rotatably supported by the bracket 17. The mechanism, the gear 26 coaxially fixed to the driven wheel 25, and the guide shaft 4 (see FIG. 2).
5) a gear 27 that meshes with the gear 26. Therefore, by configuring the gear 26 and the gear 27 with a predetermined gear ratio, the rotating arm 5 is rotated by the Geneva mechanism of the rotary drive device by the motor 19 as a drive source in units of 60 ° via the guide shaft 4. .

At the residual thread removing position B, for example, Japanese Patent Application No. 5-203610 and Japanese Patent Application No. 6-203610 previously filed by the present applicant.
No. 40351 specification, a bobbin residual yarn removing device can be adopted, and any suitable device can be adopted, as long as the residual yarn can be wound by rotating. It may be one.

In the bobbin thread automatic feeder constructed as described above, the rotation of the motor 19 causes the rotary arm 5 to repeat forward / backward movement in units of 60 ° and forward / backward along the guide shaft 4, The bobbin case 8 is reliably transported to the respective work positions A, B, C, and the work is executed or received.

For example, the bobbin case 8 is not held at one end of the rotating arm 5, and the bobbin case 8 having a bobbin (described later in detail) 7 in which a bobbin is wound by a bobbin winding device is held at the other end. Further, it is assumed that one end that does not hold the bobbin case 8 stands by at a position D (see FIG. 23) intermediate between A and B. When the predetermined sewing is completed in this state, the rotating arm 5 rotates 60 ° counterclockwise in FIG. 23 and advances to the shuttle side in FIG. 22, and there is residual thread from the shuttle 16 in the bobbin case attaching / detaching position A. A bobbin case 8 with a built-in bobbin is held at one end of the rotating arm 5.

Next, when the rotary arm 5 is retracted to the retracted position of the guide shaft 4 and rotated 180 ° and moved forward, the bobbin case 8 with the bobbin built-in which is held at the other end of the rotary arm 5 and in which the bobbin has been wound. The bobbin case is attached to the hook 16 at the attachment / detachment position A. Then, when the rotating arm 5 moves backward and rotates 60 ° clockwise in FIG. 23, the bobbin case 8 with a bobbin with a residual thread held at one end of the rotating arm 5 advances to the residual thread removing position B, The residual yarn removing device there removes the residual yarn of the bobbin 7, and the bobbin becomes an empty bobbin with no yarn. After that, when the rotating arm 5 rotates 120 ° in the counterclockwise direction in FIG. 23, the bobbin case 8 with a built-in empty bobbin from which the residual thread has been removed advances to the bobbin winding position C, and the bobbin winding device there moves the empty bobbin. The bobbin thread is wound around. After that, these operations are repeated.

Next, a bobbin winding device, which is arranged at the bobbin winding position C and characterizing the present invention, will be described with reference to FIGS.
The following description will be given with reference to 0.

This bobbin winding device operates to separate the bobbin case and the bobbin contained therein, and to rotate the rotating body which also serves as a guide for the bobbin thread with the clamped bobbin thread on the separated bare bobbin. A bobbin thread entwining operation in which the bobbin in which the bobbin is entangled by rotating the bobbin is wound around the bobbin while releasing the clamped bobbin thread and winding a set amount of the bobbin thread around the bobbin; This bobbin wound bobbin is accommodated in the bobbin case, bobbin wound bobbin drawn from the opening of the bobbin case is threaded onto the bobbin case, bobbin case thread winding The bobbin thread from the bobbin case is cut again with a certain length left from the bobbin thread tension spring to form an entangled seam with the upper thread. All are backing up operation, and the like is adapted to be performed automatically.

As shown in FIG. 1, this bobbin winding device has a subframe 10 attached to a main base 3.
One. The sub-frame 101 has a substantially U-shape and is arranged so that the opening portion faces downward. Through holes are coaxially formed in both side plates of the sub-frame 101, and bearings 103 and 104 are mounted in the through holes, as shown in FIG.

As shown in FIG. 3, one of the bearings 104 is provided on one surface of the pulley 106 so as to project, and the slit 1
A boss 106c having a shape in which the cylindrical portion is symmetrically divided into two in the axial direction is rotatably supported by 06b. As shown in FIG. 2, a winding shaft 107 is inserted into the shaft holes of the pulley 106 and the boss 106c, and the winding shaft 107 is supported by the pulley 106. A pin hole orthogonal to the axial direction is formed at the end of the winding shaft 107 corresponding to the boss 106c. A pin 108 is fitted and fixed in the pin hole, and both ends of the pin 108 are loosely fitted in the slit 106b. Therefore, the rotation of the pulley 106 is transmitted to the winding shaft 107 via the boss 106c and the pin 108, and at the same time, the winding shaft 107 slides in the axial direction because both ends of the pin 108 can slide in the slit 106b. Can move.

Further, one end of the winding shaft 107 (see FIG. 1)
Also, an E ring 301 is fixed near the right end portion in FIG. 2, and a compression spring 302 is arranged between the E ring 301 and the bearing 104. Winding shaft 1
A cam 303 is provided on one end surface (right end surface in FIGS. 1 and 2) of 07, and the winding shaft 107 is in contact with the cam 303 by the compression spring 302. The cam 303 is fixed to the output shaft 304a of the motor 304. Therefore, when the motor 304 is driven, the cam 303 rotates and the winding shaft 107 reciprocates in the axial direction.

At the other end of the winding shaft 107, as shown in FIG.
As shown in FIG. 5, an annular groove 107a is formed, and similarly to the case where the bobbin case 8 is usually fixed to the shuttle 16, a slide plate (not shown) of the bobbin case 8 is formed in the groove 107a. The bobbin case 8 is coupled with the take-up shaft 10.
It is fixed to 7.

On the other bearing 103, as shown in FIGS. 2 and 11 to 16, a thread clamp shaft 105 having a substantially hollow cylindrical shape and having flanges at both ends is slidably supported in the axial direction. Has been done. The winding shaft 107 is inserted into the shaft hole of the yarn clamp shaft 105 via a hollow cylindrical bobbin holding shaft 305, and the winding shaft 107 is rotated by the yarn clamp shaft 105 via the bobbin holding shaft 305. It is supported slidably in the direction.

The bobbin holding shaft 305 is, as shown in FIG. 10, a shaft portion 3 fitted and fixed to the winding shaft 107.
05c and the take-up shaft 10 that is connected to the shaft portion 305c.
7 and a shaft portion 305d having a slight clearance. The shaft portion 305d has a cross-shaped split groove 305a cut out from the end thereof.
b is a taper surface which tapers toward the side opposite to the pulley. Therefore, when the bobbin holding shaft 305 moves together with the winding shaft 107 toward the opposite bobbin 7 side, the bobbin 7 is guided by the tapered surface 305b and at the same time the shaft portion 3 is moved.
The outer diameter of 05d becomes small (the winding shaft 107 and the shaft portion 3
The clearance between the shaft portion 3a and the shaft portion 3d becomes smaller, and the shaft portion 305d of the bobbin holding shaft 305 is fitted into the shaft portion 305d.
05d (details will be described later).

On the outer peripheral surface of the flange portion of the thread clamp shaft 105 on the side opposite to the pulley, resistance is applied (hooked) to the clamped bobbin thread 150 so that this bobbin thread 150 can be entangled well with the bobbin 7. Concavities and convexities (substantially the same as those formed on the outer peripheral surface of the coin) are formed (details will be described later). Further, the collar portion 1 on the pulley side of the thread clamp shaft 105
A compression spring 110 is arranged between 05a and the bearing 103. Therefore, the yarn clamp shaft 105 is urged toward the pulley by the compression spring 110, and the urging force brings the flange portion of the yarn clamp shaft 105 on the side opposite to the pulley into pressure contact with the bearing 103. . In this state (initial state), the end of the winding shaft 107 on the side opposite to the pulley protrudes further to the side opposite to the pulley than the end of the thread clamp shaft 105 on the side opposite to the pulley, as shown in FIGS. In this state, the end surface of the shaft portion 305d of the bobbin holding shaft 305 on the side opposite to the pulley is slightly projected to the side opposite to the pulley from the flange portion of the thread clamp shaft 105 on the side opposite to the pulley.

As shown in FIGS. 2 and 4, the rotary drive mechanism of the pulley 106 includes a motor 115, a transmission shaft 114 attached to the output shaft of the motor 115 with the same axis, and a transmission shaft 114. Pulley 1 fixed to 114
13 and a timing belt 112 that is wound around the pulley 113 and the pulley 106. Therefore, the rotational driving force of the motor 115 is
4 is transmitted to the pulley 106 via the pulley 113 and the timing belt 112.

As shown in FIG. 1, a roller 136a can come into contact with the pulley-side end surface of the pulley-side flange portion 105a of the thread clamp shaft 105, as shown in FIG. This roller 136a, as shown in FIG.
The lever 136 is supported by the collar 137.
It is fixed at one end. There is no problem even if the roller 136a is a member that does not rotate.

The collar 137 is rotatably supported by the column 2, and the collar 137 is shown at 90 in FIG.
One end of the link 138 is fixed to the other end that is rotated counterclockwise. At the other end of this link 138, link 1
One end of 39 is pivotally attached, and the other end of this link 139 is pivotally attached to the piston rod of the air cylinder 140. Therefore, when the air cylinder 140 is driven (the piston rod is pushed out in this embodiment), the collar 137 rotates counterclockwise in FIG.
36a pushes the collar portion 105a of the thread clamp shaft 105 toward the counter pulley side against the urging force of the spring 110 that urges the thread clamp shaft 105 toward the pulley side, and as a result, the thread clamp shaft 105 moves toward the counter pulley side. And the gap is formed between the flange portion of the yarn clamp shaft 105 on the side opposite to the pulley and the bearing 103.

As shown in FIG. 2, a substantially hollow cylindrical collar 180 is fitted around the bearing 103,
The collar 180 prevents the collar 180 from coming off in the axial direction. The upper part of the collar 180 on the side opposite to the pulley in FIG. 2 is provided with a thread separating mount 116a with a moving knife protruding therefrom.
The thread separator 116 with a moving knife shown in FIG. 5 is fixed to 6a.

The thread separator 116 with a moving knife is provided with V-shaped notches 116C and 116D for introducing the lower thread at the front end (front side in FIG. 2) and the rear end (back side in FIG. 2), respectively. It has a moving knife plate 116A and V
As shown in FIGS. 5 and 18, the character-shaped notches 116C and 116D have the apex of the notches 116C as the notch 1.
It is formed so as to be displaced to the left side in FIG. 2 with respect to the apex of 16D. Notch 116C on the upper surface of moving knife plate 116A
A cutting eyeball (moving knife) 116E is formed on a line approximately connecting the apex of the cutting portion 116D and the apex of the cut portion 116D, and a small gap through which the fixed knife 91 shown in FIG. Thread splitting wings 116B are provided which are vacant and whose edges are slightly displaced. As shown in FIG. 4, the moving knife plate 116 </ b> A and the yarn separating blade 116 </ b> B are both curved in an arc shape with the winding shaft 107 as a center, and the yarn separator with moving knife 116 rotates together with the collar 180. When reaching the position of the fixed knife 91, the moving knife 116E on the back of the moving knife plate 116A rubs against the tip of the fixed knife 91,
Each positional relationship is adjusted.

On the outer circumference of the collar 180 on the pulley side,
As shown in FIG. 1, a gear 122 is formed,
The gear 122 includes the gear 121, the gear 120, and the gear 11.
It is rotationally driven by a motor 123 capable of normal rotation / reverse rotation via 9, a gear 118, and a gear 117. That is, by driving the motor 123, the collar 180 and the thread separating device with moving knife 116 are rotated in the forward and reverse directions.

Further, the outer periphery of the collar 180 at the substantially center is
As shown in FIG. 2, a collar 306 is rotatably supported, and this collar 306 is in a state of being axially fixed by C-rings 3077, 3077 for preventing slippage. The collar 306 has a rotating body 306a extending to the side opposite to the pulley along the winding shaft 107, and a guide hole 306b through which the bobbin thread 150 passes is formed at an end of the rotating body 306a on the side opposite to the pulley. There is. As shown in FIG. 1, a gear 307 is formed on the outer circumference of the collar 306. As shown in FIG.
08, gear 309, gear 310, gear 311, gear 31
It is rotationally driven by a motor 313 via 2. That is, by driving the motor 313, the collar 30
The rotary body 306a on the 6 is rotatable.

As shown in FIGS. 1, 6, and 7, a thread hooking lever 124 is rotatably supported on the outer periphery of the upper portion of the bearing 103 by a step screw 124a in a plane orthogonal to the paper surface of FIG. Has been done. This thread hook lever 12
4 has a hook 124 at the tip as shown in FIG.
A and an inclined surface 124B that is continuous with the hook 124A and inclines from the upper side to the lower right side in FIG. 6 are formed. The thread hooking lever 124 is provided with a torsion spring 12
5 is urged counterclockwise in FIG. 6,
In the normal state, it is in the state shown by the solid line in FIG.

A wiper 130 is arranged on the front side in FIG. 1 of the tip of the winding shaft 107. The wiper 130 has a rod shape with a bent partway, and
A shaft 129 rotatable coaxially with (see FIGS. 21 and 24)
It is fixed to its central part. A gear 132 is fixed to the end of the shaft 129, and the gear 132 has an axis in a direction orthogonal to the axis of the gear 132.
Are in mesh. Link 1 is provided at the end of the gear 133.
One end of 31a is connected. At the other end of this link 131a, as shown in FIGS.
One end of b is pivotally attached, and one end of a link 131c is pivotally attached to the other end of this link 131b. The other end of this link 131c has a rotary air cylinder 1
It is connected to the rotating portion 34. Therefore, when the air cylinder 134 is driven, the wiper 130 rotates about the shaft 129.

As shown in FIG. 2, a bobbin presser bar 314 is arranged outside the flange part of the thread clamp shaft 105 on the anti-pulley side and further outward of the pulley side. Can be moved forward and backward by the air cylinder 315 toward the winding shaft 107.

A mechanism for removing the looseness of the lower thread is provided between the arm 306a and the bobbin 200, as shown in FIG. This mechanism uses a lower thread 150 in the through holes at both ends.
A lever 201, a shaft 203 that rotatably supports the lever 201, and a spring 202 that biases one end (the upper end in the drawing) of the lever 201 to the right in the drawing.
And the loosening of the lower thread 150 upstream / downstream of the mechanism is removed by this mechanism.

Between the lever 201 and the spool 200,
Thread tension varying means 204 for varying the tension of the lower thread 150 is provided. The thread tension varying means 204 includes a tension spring 205 for pressing the passing bobbin thread 150, a screw 206 for manually adjusting the pressing force of the tension spring 205, and the tension spring 20 arranged in the sewing machine bed 1.
5 and a solenoid SOL that produces a solenoid thrust force against the pressing force of 5.

The electric circuit for driving the thread tension varying means 204 has a structure in which a power source V is connected in series to a solenoid SOL and a switch SW is interposed therebetween.

Therefore, when the switch SW is turned off, the solenoid thrust is not generated, the pressing force of the tension spring 205 is applied to the bobbin thread 150 to the maximum, and the bobbin thread tension is maximized. When the switch SW is turned on, the solenoid thrust force is generated to the maximum, and the lower thread 150 is applied with the solenoid thrust force subtracted from the pressing force of the tension spring 205, and the lower thread tension is minimized.

Next, the operation of the bobbin winding device of the sewing machine constructed as above will be described below with reference to FIGS. 11 to 21.

First, the rotating arm 5 of the above-mentioned automatic bobbin thread feeder rotates, and the bobbin case 8 with the empty bobbin 7 in which the residual thread is removed reaches the bobbin thread winding position C.

At this time, the bobbin winding device is in the initial state as shown in FIG.
0 is passed through the guide hole 306b of the rotating body 306a, and its tip is manually set between the collar portion of the thread clamp shaft 105 on the side opposite to the pulley and the bearing 103,
It is clamped by the biasing force of the compression spring 110. The clamp from the second winding is automatically performed at the end of the first winding, thread hooking, and thread cutting operations (details will be described later).

Then, in this state, the rotating arm 5 is advanced to the bobbin winding device side, the bobbin 7 accommodated in the bobbin case 8 is inserted into the winding shaft 107, and the slide plate of the bobbin case 8 is inserted. The winding groove 107a of the winding shaft 107
, The bobbin case 8 is fixed to the winding shaft 107, and the lock lever 8X of the bobbin case 8 is closed to release the lock of the bobbin case 8 to the bobbin 7 and the bobbin case 8 together. The winding shaft 107
Then, the rotating arm 5 is retracted (see FIG. 12).

Next, the motor 304 is driven to advance the winding shaft 107 and the bobbin holding shaft 305 to the rotating arm 5 side, and at the same time, the air cylinder 315 is driven to cause the bobbin pressing rod 314 to project to the bobbin 7 side. The bobbin pressing rod 314 presses the bobbin 5 to restrict the movement of the bobbin 7 in the axial direction. Then, the bobbin case 8 and the bobbin 7 are separated from each other, and the bobbin 7 is separated from the bobbin 7 by the axial movement restriction of the bobbin 5 by the bobbin pressing rod 314.
Tapered surface 305 of shaft portion 305d of bobbin holding shaft 305
While being guided by b, it is inserted into the shaft portion 305d,
It is held by the shaft portion 305d (see FIG. 13).

Next, the rotary arm 5 is advanced to the bobbin winding device side, the lock lever 8X of the bobbin case 8 is opened, the bobbin case 8 is gripped, and then the rotary arm 5 is retracted and the air is blown. The cylinder 315 retracts the bobbin pressing rod 314 (see FIG. 14).

At this point, the switch SW of the thread tension varying means 204 is turned on to maximize the solenoid thrust to minimize the bobbin thread tension.

Next, the motor 313 is driven to drive the collar 30.
The rotating body 306a of 6 is rotated. Then, the bobbin thread 150 pinched between the flange portion on the side opposite to the pulley of the thread clamp shaft 105 and the bearing 103 is formed on the outer peripheral surface of the collar portion on the side opposite to the pulley of the thread clamp shaft 105. Resistance is imparted by the uneven portion, and the lower thread 150 is entangled with the bobbin 7 satisfactorily (see FIG. 15).

At this time, the bobbin thread 150 is the thread separator 1 with the moving knife.
The motor 123 is driven so as not to get entangled with the yarn 16, and the thread separating device with a moving knife 116 is rotated in the same direction.

Then, for example, by an experiment or the like, it is determined at what rotational position the bobbin 7 is entangled with the bobbin thread 150. When this rotation is made, the driving of the motors 313 and 123 is stopped and the rotating body 306a and the moving knife are stopped. The rotation of the attached thread separator 116 is stopped.

Then, the motor 115 is driven to rotate the winding shaft 107 and the bobbin holding shaft 305, and the bobbin 7 held by the bobbin holding shaft 305 is rotated. Then, the bobbin 7 is rotated to wind the bobbin thread 150 from the bobbin 200 around the bobbin 7, and the collar portion of the thread clamp shaft 105 on the side opposite to the pulley and the bearing 10 are wound.
The bobbin thread end portion, which is sandwiched between 3 and 3, is unclamped by this rotational force.

At this time, the motor 304 is driven to drive the cam 30.
3 is rotated to reciprocate the winding shaft 107 in the axial direction. Then, the bobbin 7 reciprocates in the axial direction together with the winding shaft 107, and the bobbin winding on the bobbin 7 can be performed neatly and cleanly (see FIG. 16).

That is, in this embodiment, the bobbin 7
Until the entwining of the lower thread 150 with the bobbin 7 is manually performed, the bobbin 7 is rotated without rotating the bobbin 306a.
When the bobbin 7 is wound, the bobbin 7 is wound by rotating the bobbin 7 so that the wound yarn is not twisted.

When the number of rotations reaches a predetermined value, the driving of the motor 115 is stopped to stop the rotation of the bobbin 7, and the driving of the motor 304 is stopped to stop the axial reciprocating movement of the winding shaft 107. To do. This rotation count is a value corresponding to a desired winding amount and is a value obtained in advance.

When the bobbin is wound around the bobbin 7 in this way, the rotary arm 5 is advanced to the bobbin winding device side, and the bobbin 7 in which the bobbin is wound is accommodated in the bobbin case 8. At the same time, the lock lever 8X of the bobbin case 8 is opened to lock the bobbin 7 on the bobbin case 8 to hold the bobbin case 8, and then the motor 304 is driven to drive the winding shaft 107 and the bobbin holding shaft 305. Is retracted from the rotary arm 5 side (see FIG. 17).

After the bobbin thread 150 is automatically wound around the bobbin 7 in this manner, the bobbin case 8 is then hooked.

First, the switch S of the thread tension varying means 204
Turn off W to eliminate the solenoid thrust and maximize the bobbin thread tension.

Next, the motor 123 is driven to rotate the thread separating unit with a moving knife 116 half a turn. Then, the lower thread 150 drawn out from the opening 8A of the bobbin case 8 (see FIG. 8).
Is caught at the top of the V-shaped notch 116D,
The bobbin case 8 moves toward the thread hooking position 8B on the lower thread tension spring side (see FIG. 18).

At this time, the bobbin thread moving toward the thread hooking position 8B contacts the inclined surface 124B of the thread hook lever 124 and pushes the thread hook lever 124 in the traveling direction. As described above, since the torsion spring 125 is biased in the direction opposite to the traveling direction,
As shown in FIG. 4, the lower thread is guided to the slit 8C at the thread hooking position 8B after the thread hook lever 124 is pushed in the advance direction by a predetermined amount. Then, the motor 123 is driven to rotate the thread separating unit with moving knife 116 in the reverse half rotation to return the thread separating unit with moving knife 116 to the original position (see FIG. 19).

Next, the wiper 130 is rotated by about 180 ° about the shaft 129 by the air cylinder 134 as shown in FIG. Then, the thread portion led out from the slit 8C is hooked on the wiper 130, the bobbin thread portion that has entered the slit 8C sunk under the bobbin thread tension spring 8D, and then the air cylinder 134.
Returns the wiper 130 to the initial position.

When the thread hooking operation on the bobbin case 8 is automatically performed in this manner, then the bobbin thread supplied to the thread hooked bobbin case 8 is cut.

First, the switch S of the thread tension varying means 204
W is turned on to maximize the solenoid thrust to minimize the bobbin thread tension.

Next, the spring 11 that drives the air cylinder 140 to urge the thread clamp shaft 105 toward the pulley side.
The collar portion 105a of the thread clamp shaft 105 against the urging force of 0.
Is pushed to the side opposite to the pulley, and a gap is formed between the flange portion on the side opposite to the pulley of thread clamp shaft 105 and bearing 103.

Next, the motor 123 is driven to rotate the thread separating device with a moving knife 116 in the direction opposite to that shown in FIG.
Then, as shown in FIG. 21, the lower thread 150 drawn from the lower thread tension spring 8D of the bobbin case 8 is caught at the apex of the V-shaped notch 116C, and the thread is pulled out.

The drawn-out thread is captured at the apex of the V-shaped notch 116C and the thread-separating wing 116
It is sorted to the right side in FIG. 21 by B. Therefore, arm 3
As shown in FIG. 21, the bobbin thread from 06a is guided to the guide hole 306b and is moved to the right side in the drawing, and the bobbin thread that is moved to the right side is connected to the collar portion of the thread clamp shaft 105 opposite to the pulley side. It enters the gap between the bearing 103.

At this point, the advance of the yarn clamp shaft 105 is released by the air cylinder 140. Then, the yarn clamp shaft 105 moves to the right in FIG. 2 due to the biasing force of the spring 110 shown in FIG.
The rotating body 306 is provided between the flange portion on the side opposite to the pulley and the bearing 103.
The lower thread from a is clamped.

Then, the motor 123 is further driven to slightly rotate the thread separating unit with moving knife 116 in the same direction. Then, the moving knife 116E of the thread separating unit with a moving knife 116 and the fixed knife 91 face each other, and the lower thread 150 between them is cut.
That is, the lower thread drawn out from the lower thread tension spring 8D of the bobbin case 8 is cut out with a certain length. This fixed length is a length necessary for forming a seam by being entangled with the upper thread, and the positions of the fixed knife 91 and the like are adjusted so that the length can be secured.

When the bobbin thread cutting operation is automatically performed, the rotary arm 5 is retracted to the retracted position of the guide shaft 4 and is rotated and moved forward to be held by the rotary arm 5 and the bobbin thread is already wound. The bobbin case 8 with a built-in bobbin is attached to the hook 16 at the bobbin case attaching / detaching position A.

At this time, the bobbin winding device returns to the initial state in which the bobbin thread tip from the bobbin winding 200 is clamped between the flange portion on the side opposite to the pulley of the thread clamp shaft 105 and the bearing 103, as described above. It is in a standby state.

In the bobbin case 8 used in the present embodiment, as shown in FIG. 8, the thread 150 drawn out from the opening 8A is inserted into the bobbin case 8 at the thread hooking position 8B on the lower thread tension spring side. Chamfer 8a to make it easier to move to
However, there is no change in the sewing quality due to the chamfer 8a.

As described above, in the present embodiment, the bobbin 7 is separated from the bobbin case 8 by the bobbin separating / coupling means 5, 314, 315, and the thread clamp means 103, 10 are provided.
5, 110 is used to clamp the bobbin thread 150, and in this state, the rotary body 306a is rotated to rotate the thread clamp means 103, 1
The bobbin thread 150 clamped by 05, 110 is entwined with the bobbin 7 separated from the bobbin case 8 by the bobbin separating / coupling means 5, 314, 315, and the winding shaft 10
7 by rotating the yarn clamping means 103, 105, 110
Even if the bobbin thread 150 is wound around the bobbin 7 while releasing the bobbin thread 150 clamped by the bobbin 7 and the bobbin 7 is housed in the bobbin case 8 after the bobbin thread is wound, the bobbin case 8 is wound at the beginning of winding. Since it is configured so as not to remain outside, it is possible to form a good seam and prevent the occurrence of needle thread breakage. Further, since the bobbin 7 and the bobbin case 8 are configured so that they can be wound without making any or almost any change, it is possible to maintain the sewing quality and reduce the cost.

The reciprocating means 303 and 304 reciprocally move the winding shaft 107 in the axial direction when the winding shaft 107 rotates, and the bobbin 7 also reciprocates in the axial direction in the same manner. It is possible to perform bobbin winding beautifully without bias.

Although the invention made by the present inventor has been specifically described based on the embodiments, 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, in the above embodiment, the chamfer 8a is provided in order to facilitate the movement of the thread 150 led out from the opening 8A to the thread hooking position 8B on the bobbin case 8 on the lower thread tension spring side. The chamfer 8a is provided just in case.
It goes without saying that the effect of the present invention can be obtained without performing the above.

[0079]

As described above, according to the bobbin thread winding device of the first aspect of the invention, the bobbin is separated from the bobbin case by the bobbin separating / coupling means, and the bobbin thread is clamped by the thread clamping means. In this state, the rotating body is rotated so that the bobbin thread clamped by the thread clamp means is entangled with the bobbin separated from the bobbin case by the bobbin separating / coupling means, and the winding shaft is rotated by the thread clamp means. The bobbin is wound around the bobbin while releasing the clamped bobbin thread, and even if the bobbin is housed in the bobbin case after winding the bobbin thread, the winding start thread end does not remain outside the bobbin case. Therefore, it is possible to form a good seam and prevent the occurrence of needle thread breakage. Further, since the bobbin and the bobbin case can be wound without changing the bobbin and the bobbin case at all, it is possible to maintain the sewing quality and reduce the cost.

According to the bobbin thread winding device of the sewing machine of the second aspect, in addition to the first aspect, the reciprocating means can be used.
Since the winding shaft reciprocates in the axial direction when rotating, and the bobbin also reciprocates in the axial direction in the same manner, it is possible to neatly wind the bobbin thread around the bobbin without deviation. .

[Brief description of drawings]

FIG. 1 is a side view of a bobbin winding device of a sewing machine according to an embodiment of the present invention.

2 is a partial cross-sectional plan view of FIG.

FIG. 3 is a perspective view of a pulley.

FIG. 4 is a diagram of FIG. 1 viewed from the left side.

FIG. 5 is a perspective view of a thread separator with a moving knife.

FIG. 6 is a plan view of a thread hooking lever.

FIG. 7 is a transverse sectional view of the thread hooking lever.

FIG. 8 is a perspective view of a bobbin case adopted in the embodiment.

FIG. 9 is a front view of the yarn tension varying means applied to the embodiment.

FIG. 10 is a perspective view of a winding shaft and a bobbin holding shaft.

FIG. 11 is a side explanatory view of the essential part showing the initial state of the same apparatus.

FIG. 12 is an explanatory side view of the essential part showing the operation of delivering the bobbin and the bobbin case to the same apparatus.

FIG. 13 is a side view of a main part showing a separating operation of the bobbin and the bobbin case.

FIG. 14 is a side view of a main part showing a bobbin and a bobbin case separated by a separating operation.

FIG. 15 is an explanatory side view of an essential part showing a bobbin thread entanglement operation on the bobbin.

FIG. 16 is a side view for explaining an essential part of the bobbin winding operation on the bobbin.

FIG. 17 is an explanatory side view of the main part showing the operation of housing the bobbin wound with the lower thread in the bobbin case.

FIG. 18 is an explanatory plan view of the main part showing the bobbin thread guiding operation to the slit of the bobbin case.

FIG. 19 is an explanatory plan view of the essential parts showing the lower thread guiding operation following the lower thread guiding operation to the slit in FIG. 18;

FIG. 20 is a side view for explaining a lower thread hanging operation of the bobbin case under the lower thread tension spring.

FIG. 21 is a side view for explaining an essential part of the bobbin thread cutting operation.

FIG. 22 is a perspective view of an automatic bobbin thread supplying device to which the same upper and lower thread winding device is applied.

FIG. 23 is a front view of FIG. 22.

FIG. 24 is a plan view of FIG. 22.

FIG. 25 is a transverse cross-sectional view of the main part of FIG.

FIG. 26 is a partially cutaway front view showing the relationship between a rotary arm, a forward / backward lever, and a guide shaft that constitute the same upper and lower yarn automatic feeders.

[Explanation of symbols]

 5, 314, 315 bobbin separating / connecting means 7 bobbin 8 bobbin case 103, 105, 110 thread clamping means 107 winding shaft 150 bobbin thread 303, 304 reciprocating means 306a rotating body

Claims (2)

[Claims] 1. A bobbin separating / coupling means capable of separating / coupling a bobbin from a bobbin case, a thread clamp means capable of clamping / releasing a lower thread, and a bobbin separating / coupling means for separating a bobbin from the bobbin case. A rotating body for rotating the bobbin clamped by the thread clamp means with respect to the bobbin to rotate the bobbin, and rotating the bobbin with the bobbin clamped by the bobbin to clamp the bobbin with the bobbin. A bobbin winding device for a sewing machine, comprising: a winding shaft capable of winding a bobbin onto a bobbin while releasing the bobbin. 2. The bobbin thread winding device according to claim 1, wherein the bobbin thread winding device comprises a reciprocating means for reciprocating the winding shaft in the axial direction when the winding shaft rotates.