JPH08117473A - Bobbin case of lower thread winding device - Google Patents

Abstract

PURPOSE: To excellently accomplish thread hooking operation without using a lower thread guide support mechanism. CONSTITUTION: The tilt angle θ1 of a slit groove 8C to a bobbin case opening end part 8E where a lower thread 150 passes when hooked is made large and the movement of the lower thread 150 from a thread hook position 8B to a lower thread lead-out hole 8G is facilitated without the lower thread guide support mechanism such as a wiper mechanism, etc. Further, the position relation between the lower thread lead-out hole 8G and a hole 8H for a lower thread tension spring in the bobbin axial direction is so set that they are in level with each other or that the lower thread lead-out hole 8G is positioned more on the opposite opening end edge side of the bobbin case than the hole 8H for the lower thread tension spring; and then the lower thread 150 which is led to the lower thread lead-out hole 8G is easily led to the lower thread tension spring hole 8H as it is without using the lower thread guide support mechanism such as the wiper mechanism.

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 mounted on the hook again. Or, a bobbin that has been wound with a bobbin that has been prepared in advance is replaced.

[0003]

However, such a manual winding operation of the bobbin thread on the bobbin and a bobbin case replacement work require a lot of time and labor. -188688 Specification and Japanese Patent Application No. 6
-64456 specification proposes a device for automatically winding a bobbin on a bobbin and automatically threading the bobbin case and cutting the lower thread on the bobbin case. There is.

As shown in FIGS. 23 and 24, a bobbin winding device, such as the device described in Japanese Patent Application No. 4-188688 and Japanese Patent Application No. 6-64456, is used in a bobbin case. Bobbin 7 built into 8 bobbin thread 150
And the lower thread 150 wound around the bobbin 7 and led out from the opening 8A of the bobbin case 8,
Through the gap 8K between the open end edge 8EE of the bobbin case 8 and the outer circumference of the bobbin and the slit groove 8CC at the thread hooking position 8B, the bobbin case 8 is guided to the lower thread outlet hole 8GG, and the lower thread 150 led out from the lower thread outlet hole 8GG is moved downward. The bobbin case 8 is pulled out from the lower thread tension spring hole 8H below the bent end 8DD bent inward (bobbin axial direction side) of the thread tension spring 8D.
The thread is automatically threaded.

Here, in the conventional bobbin case 8, the inclination angle θ of the slit groove 8CC with respect to the bobbin case open end portion 8EE through which the lower thread 150 passes when the thread is hooked.
Has a relatively gentle inclination of about 60 °, and therefore the lower thread 1 guided to the slit groove 8CC by a lower thread guiding mechanism such as thread handling (see Japanese Patent Application No. 6-64456).
In order to guide 50 to the lower thread leading hole 8GG, for example, a wiper mechanism (moving mechanism in the axial direction of the bobbin; Japanese Patent Application No. 6-6).
A lower thread guiding auxiliary mechanism such as the specification of No. 4456) is required.

In addition to the above-mentioned function, this bobbin thread guide assist mechanism has a function that the bobbin thread 1 is inserted into the opening 8A of the bobbin case 8 when the bobbin thread is wound.
It must also have a function of pulling 50, that is, it must be able to guide the lower thread 150 in different directions. For example, the lower thread 150 can be placed in the opening 8A of the bobbin case 8.
In the case where the structure that emphasizes the function of pulling the lower thread is important, there is a fear that the lower thread guide assist mechanism cannot properly guide the lower thread 150 from the slit groove 8CC to the lower thread outlet hole 8GG.

Further, the positional relationship in the bobbin axial direction between the lower thread lead-out hole 8GG and the lower thread tension spring hole 8H is such that the lower thread lead-out hole 8GG is closer to the open end side of the bobbin case 8 than the lower thread tension spring hole 8H. (The right side in FIG. 24), it is set so that the lower thread 150 is lower than the lower thread outlet hole 8G.
Even if guided to G, the lower thread 150 guided to the lower thread outlet hole 8GG is guided to the lower thread tension spring hole 8H, that is, the lower thread 150 guided to the lower thread outlet hole 8GG is further illustrated in FIG.
In order to guide it to the left side of the lower thread tension spring hole 8H and lead it out from the lower thread tension spring hole 8H, a lower thread guide assist mechanism such as the wiper mechanism is required.
For example, in the case where the structure which attaches importance to the function of bringing the lower thread 150 closer to the opening 8A of the bobbin case 8 is used, the lower thread lead-out hole 8G
There is a fear that the lower thread 150 from G cannot be properly guided to the lower thread tension spring hole 8H.

Further, as described above, the bobbin thread 15
Since 0 passes through the gap 8K between the open end edge 8EE of the bobbin case 8 and the outer circumference of the bobbin, the bobbin thread 150 comes into contact with the bobbin case open end portion 8EE. Since the lower thread 150 is originally a portion that is not touched, it is often sharp or has burrs or scratches. Therefore, the lower thread 150 causes thread breakage while passing through the gap 8K, and the reliability of the device is improved. There is a problem that it deteriorates. In particular, in the above device, the lower thread 150 is loosened when the thread is hooked, and the lower thread 150 is tensioned. Therefore, the lower thread 150 is strongly pressed against the bobbin case open edge portion 8EE. And thread breakage is more likely to occur. Similarly, when the yarn count is made large and thin, the yarn breakage easily occurs.

Therefore, it is a first object of the present invention to provide a bobbin case of a bobbin winding device capable of satisfactorily completing a thread hooking operation without using a bobbin thread guiding auxiliary mechanism.

In addition to the above first object, the present invention also provides a bobbin case for a bobbin winding device capable of preventing yarn breakage during threading and improving reliability. The purpose is 2.

[0011]

In order to achieve the first object, the bobbin case of the bobbin winding device according to claim 1 is
A bobbin thread is automatically wound around a bobbin built in the bobbin case, and the bobbin thread wound around the bobbin and led out from the opening of the bobbin case is provided with a gap between the open end of the bobbin case and the outer circumference of the bobbin. By guiding the lower thread through the slit groove to the lower thread leading hole, and leading the lower thread leading from this lower thread leading hole from the lower thread tension spring hole under the lower thread tension spring end,
A bobbin case applied to a bobbin thread winding device that automatically thread-hooks a bobbin case, wherein the slant angle of the slit groove with respect to the bobbin case open end portion through which the bobbin thread passes when threading Is steep, and the positional relationship in the bobbin axial direction between the bobbin thread lead-out hole and the bobbin thread tension spring hole is at the same level or the bobbin thread take-out hole is more than the bobbin case for the bobbin case. It is set so that it is located on the side opposite to the open end of.

In order to achieve the second object, a bobbin case of a bobbin winding device according to a second aspect is the bobbin case of the bobbin case open end portion through which the bobbin thread passes during threading, in addition to the first aspect. The chamfering process is performed so that the cross section in the axial direction of the bobbin is curved.

[0013]

According to the bobbin case of the bobbin winding device of the first aspect, the inclination angle of the slit groove with respect to the bobbin case open end portion through which the bobbin thread passes during threading is made steep. Therefore, the bobbin thread can be easily moved from the thread hooking position to the bobbin thread leading hole without a bobbin thread guiding auxiliary mechanism such as a wiper mechanism. Since the bobbin thread is located at the same level in the axial direction of the bobbin from the use hole or on the side opposite to the open end edge of the bobbin case, the bobbin thread guided to the bobbin thread lead-out hole does not have a bobbin thread guide assist mechanism such as a wiper mechanism. Is also easily guided as it is to the hole for the bobbin thread tension spring.

According to the bobbin case of the bobbin winding device according to the second aspect, even if the bobbin thread comes into contact with the open end portion of the bobbin case during threading, a curved chamfering process is performed on the abutting portion. Therefore, thread breakage during threading is prevented.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, with reference to FIG. 19 to FIG. 23, an outline of an automatic bobbin thread supplying device adopting a bobbin winding to which the bobbin case of the present invention is applied will be described.

This automatic bobbin thread feeder is used in the sewing machine bed 1.
Is placed in the space where the bottom below is an oil reservoir,
As shown in FIGS. 19 and 20, 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. , 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. 22, the guide shaft 4 is rotatably supported by the standing portion of the main base 3 at both ends. As shown in FIG. 23, 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. 19, the rotating arm 5 extends symmetrically from the center to both sides and slightly bends. A bobbin 7 is built in near each end as shown in FIG. The bobbin case 8 is detachably supported. The bobbin attaching / detaching mechanism in the rotating arm 5 is disclosed in, for example, Japanese Patent Laid-Open No. 5-1.
For example, a pair of electromagnet adsorption heads described in the bobbin automatic feeder of Japanese Patent No. 92476 and the bobbin exchanging device of the sewing machine of Japanese Patent Application No. 5-121960 previously filed by the applicant of the present application Japanese Patent Application No. 5 previously filed by a person
A suitable one such as a lever claw described in the bobbin changing device of the sewing machine of the specification No. 116363 can be adopted. In short, the bobbin case 8 can be used as a facing member (for example, a shuttle 16) as necessary. Anything that can be attached to and detached from is acceptable.

The forward / backward 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, in the long hole 6a of the forward / backward moving lever 6, as shown in FIGS.
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. 21, 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).
2) 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 yarn 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 thread removing device can be adopted, and any other suitable device can be adopted.
It has a pinching member capable of pinching or releasing the tip end of the thread wound around, and is capable of automatically winding the bobbin thread pinched by the pinching member by rotating about a single axis. It can be anything.

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 to move 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, but the bobbin case 8 in which a bobbin (described later in detail) 7 having a bobbin 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. 20) which is an intermediate position between A and B. When the predetermined sewing is completed in this state, the rotating arm 5 rotates 60 ° counterclockwise in FIG. 20 and advances to the shuttle side in FIG.
A bobbin case 8 with a built-in bobbin with residual thread is held at one end of the rotating arm 5 from the shuttle 16 in FIG.

Next, when the rotating arm 5 is retracted to the retracted position of the guide shaft 4 and is rotated by 180 ° and moved forward, the bobbin case 8 with the bobbin built-in which is held at the other end of the rotating arm 5 and has the bobbin wound therein is 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 ° in the counterclockwise direction in FIG. 20, 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 thread removing device there removes the residual thread of the bobbin 7, and the bobbin becomes an empty bobbin with no thread. After that, when the rotating arm 5 rotates clockwise by 120 ° in FIG. 20 and moves backward, the bobbin case 8 with the empty bobbin from which the residual yarn has been removed advances to the bobbin thread winding position C, and by the bobbin thread winding device there. The bobbin is wound around the empty bobbin. After that, these operations are repeated.

Next, the bobbin winding device arranged at the bobbin winding position C will be described below with reference to FIGS. 1 to 7 and 18.

This bobbin thread winding device clamps the bobbin thread, introduces the bobbin thread into the bobbin case, and imparts rotation to the bobbin and releases the clamp to accommodate the bobbin thread at the beginning of winding into the bobbin case. The operation of winding the bobbin on the bobbin, the operation of threading the bobbin wound on the bobbin and leading from the opening of the bobbin case onto the bobbin case, the bobbin thread from the bobbin wound on the bobbin case The operation of cutting the bobbin case with a certain length left from the lower thread tension spring to form an entangled seam with the thread, so that these operations can be repeated,
The operation of re-clamping the bobbin thread from the bobbin can be automatically performed, and the bobbin thread tension during these series of operations can be optimally set.

As shown in FIG. 1, this bobbin winding device has a sub-frame 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.

On one bearing 104, as shown in FIG.
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. Pulley 1
On the other surface of 06, a boss 106a having a substantially cylindrical shape,
It is formed coaxially with the shaft hole of the pulley 106 and the boss 106c. As shown in FIG. 2, a winding shaft 107 is inserted into the shaft holes of the boss 106a, the pulley 106, and the boss 106c, and the winding shaft 107 is in a state of being supported by the pulley 106. There is. A pin hole that is orthogonal to the axial direction is formed at the end of the winding shaft 107 that corresponds to the bearing 104. Pin 1 in this pin hole
08 is fitted and fixed, and further, both ends of the pin 108 are loosely fitted and arranged in the slit 106b.
Therefore, rotation of the pulley 106 is caused by rotation of the boss 106c and the pin 10.
8 is transmitted to the winding shaft 107, and at the same time, the winding shaft 107 can slide in the axial direction because both ends of the pin 108 can slide in the slit 106b.

On the other bearing 103, a thread clamp shaft 105 as a thread clamp means having a substantially cylindrical shape and having a flange portion at the left end in FIG. 2 is slidably supported in the axial direction. A part of the winding shaft 107 is inserted into the shaft hole on the side opposite to the pulley of the yarn clamp shaft 105, and the winding shaft 1
No. 07 is supported by the thread clamp shaft 105 so as to be slidable in the axial direction. The boss 106a is inserted into the pulley-side shaft hole of the thread clamp shaft 105, and the thread clamp shaft 105 is slidable on the boss 106a.

A flange is formed at the end of the winding shaft 107 opposite to the pulley. On the surface of the flange portion, a pin 107a for clutching an existing hole provided in the flange of the bobbin 7 and transmitting the rotation of the winding shaft 107 to the bobbin 7 is provided.
Are formed in plural, and on its peripheral surface, a large number of convex surfaces are formed at equal intervals to prevent the lower thread from slipping on the peripheral surface.

At the approximate center in the axial direction of the winding shaft 107, E
The ring 109 is attached so as to project outward, and compression springs 110 and 111 are provided between the inner wall surface of the clamp shaft 105 and the E ring 109 and between the E ring 109 and the inner wall surface of the pulley 106. Each is arranged. Therefore, the winding shaft 107 is biased to the left side in FIG. 2 by the compression spring 111 with respect to the pulley 106, and the yarn clamp shaft 105 is compressed by the compression spring 110.
It is urged to the left side in FIG. 2 with respect to 07. That is, the yarn clamp shaft 105 and the take-up shaft 107 are always shown in FIG.
Of the winding shaft 107.
The collar portion of the thread clamp shaft 105 is in pressure contact with the collar portion.

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 flange portion 105a is formed at the end of the thread clamp shaft 105 on the pulley side, and a roller 136a is abutted on the end surface of the flange portion 105a on the side opposite to the pulley. They are in contact with each other (initial state).
The roller 136a is supported by a lever 136, which is shown in FIG.
It is fixed to one end of 37. The collar 137 is rotatably supported by the column 2, and one end of a link 138 is fixed to the other end of the collar 137 rotated 90 ° counterclockwise. One end of a link 139 is pivotally attached to the other end of the link 138, and the other end of the link 139 is pivotally attached to the piston rod of the air cylinder 140. Therefore, the air cylinder 140 is driven (the piston rod is retracted in this embodiment).
2, the collar 137 rotates in the clockwise direction in FIG. 2, and the roller 136a resists the urging force of the spring 110 urging the thread clamp shaft 105 and the collar portion 1 of the thread clamp shaft 105.
05a is pushed to the pulley side, and as a result, the thread clamp shaft 10
5 is retracted to the pulley side, and a gap is formed between the collar portion of the yarn clamp shaft 105 and the collar portion of the winding shaft 107.

As shown in FIG. 2, a substantially cylindrical collar 180 is fitted around the outer circumference of the bearing 103, and a C ring 90 prevents the collar 180 from coming off in the axial direction. The upper part of the collar 180 shown in FIG. 2 is provided with a thread separating mount 116a with a moving knife protruding. The thread separating mount 116a with a moving knife is fixed to the thread separating mount 116a with a moving knife shown in FIG. Has been done.

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 13, 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.

A gear 122 is formed on the outer circumference of the collar 180 as shown in FIG.
22 is a gear 121, a gear 120, a gear 119, a gear 1
A motor 1 capable of forward and reverse rotations via a gear 18 and a gearwheel 117.
It is rotationally driven by 23. 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.

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. 20 and 21).
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.

Above the thread separating unit with moving knife 116,
Further, as shown in FIGS. 11 and 13, a yarn guide 92 for guiding the lower yarn 150 supplied from the spool 200 (see FIG. 18) is fixedly arranged on the front side. The thread guide 92 has a flat plate shape and is erected substantially horizontally, and a long hole 92a through which a lower thread is passed is formed in the plate portion. The elongated hole 92a has a height difference that inclines from left to right in FIG. 10, and the lower thread that moves in the axial direction during operation is guided along the elongated hole 92a. There is.

A mechanism for removing the looseness of the lower thread is provided between the thread guide 92 and the thread winding 200, as shown in FIG. In this mechanism, a lever 201 in which a bobbin thread 150 is passed through through holes at both ends, a shaft 203 for rotatably supporting the lever 201, and one end (upper end in the figure) of the lever 201 are attached to the right in the figure. And a spring 202 for urging. By this mechanism,
The looseness of the downstream bobbin thread 150 is designed to be removed.

Between the lever 201 and the bobbin 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 yarn 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.

The bobbin case 8 which is a feature of the present invention shown in FIGS. 8 and 9 is applied to the above bobbin winding device (of course, also to the bobbin thread automatic feeding device). In this bobbin case 8, the inclination angle θ1 of the slit groove 8C with respect to the bobbin case open end portion 8E through which the lower thread 150 passes during threading is 30 ° to 45 °.
The bobbin case 8 is formed, and the inclination angle θ1 is steeper than that of the conventional bobbin case shown in FIGS. 24 and 25.

In the bobbin case 8, the lower thread lead-out hole 8G is at the same level as the lower thread tension spring hole 8H in the bobbin axial direction (vertical direction in FIG. 9) or on the side opposite to the open end of the bobbin case ( The bobbin case 8 is formed so as to be located on the upper side in FIG. 9.

Furthermore, in the bobbin case 8, as shown in FIG. 8B, the bobbin case open end portion 8E through which the lower thread 150 passes when the thread is hooked has a curved cross section in the bobbin axial direction. It is chamfered to give a shape.
The chamfering process is performed by, for example, buffing finishing or machining, and the surface of the chamfered part 8e is smooth. The chamfered portion 8e may be coated with, for example, Teflon.

Next, the operation of the bobbin winding device thus configured will be described below with reference to FIGS. 10 to 16.

First, the rotary arm 5 of the above-mentioned automatic bobbin thread feeder rotates, and the bobbin case 8 with the built-in empty bobbin 7 from 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.
No. 0 is passed through the elongated hole 92a of the yarn guide 92, and its tip is clamped (clamped) between the collar portion of the yarn clamp shaft 107 and the collar portion of the winding shaft 105 by manual operation. The clamp from the second winding is automatically performed at the end of the first winding operation (details will be described later).

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 rotating arm 5 is moved forward (to the right in the figure), and the pin 107a of the winding shaft 107 is engaged with the existing hole provided in the flange of the bobbin 7. The air cylinder 134 causes the wiper 130 to move about 18 degrees around the shaft 129, as shown in FIG.
It is rotated 0 °. Then, the thread portion between the clutched tip portion of the lower thread 150 and the thread guide 92 is hooked on the wiper 130, and the opening 8A of the bobbin case 8 is formed.
Sent to.

Then, the motor 115 is driven to rotate the winding shaft 107, and the bobbin thread 150 is wound around the bobbin 7. Then, wiper 1 with air cylinder 134
30 is returned to the initial position, and the motor 115 is driven to wind the bobbin 7 a small amount of the lower thread 150.

When a small amount of the lower thread 150 is wound around the bobbin 7, the thread clamp shaft 105 is retracted (moved to the right in the figure) by the air cylinder 140, and the motor 115 is further driven. Then, the thread clamp shaft 1
The yarn end of the winding start clamped between the collar portion of 07 and the collar portion of the winding shaft 105 is automatically stored in the bobbin case 8 (see FIG. 12). Then, the motor 115 is continuously driven to wind the bobbin 150 around the bobbin 7 by a set amount, and the motor 115 is stopped.

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

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, as shown in FIG. 13, the lower thread 150 led out from the opening 8A of the bobbin case 8 is caught at the apex of the V-shaped notch 116D, and the lower thread tension spring side of the bobbin case 8 is provided. It moves toward the thread hooking position 8B.

At this time, the lower thread 150 goes to the thread hooking position 8B while passing through the gap 8K (see FIG. 8) between the open end edge 8E of the bobbin case 8 and the outer circumference of the bobbin, but the lower thread tension may be maximized. The bobbin thread 150 is pressed against the open end edge portion 8E of the bobbin case. However, as described above, the contact portion 8E is chamfered so that the cross section in the axial direction of the bobbin is curved. The yarn breakage due to the portion 8E does not occur.

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 shown in FIG. 13, 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. 14).

At this time, since the bobbin thread tension is maximum and the inclination angle θ1 of the slit groove 8C is steep, the bobbin thread 150 guided to the slit groove 8C has a lower thread tension spring 8D. The lower thread leading hole 8G is guided. The bobbin thread 150 guided to the bobbin thread outlet hole 8G is located at the same level in the bobbin axial direction as the bobbin thread outlet hole 8G or on the side opposite to the open end edge of the bobbin case 8 in the bobbin axial direction. Therefore, it is guided as it is to the lower thread tension spring hole 8H (see FIG. 15).

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 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. 16, 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 caught at the apex of the V-shaped notch 116C, and the thread-separating wing 116
It is sorted to the right side in FIG. 16 by B. Therefore, the bobbin thread from the thread guide 92, as shown in FIG.
2a is guided to the right side in the drawing, and the lower thread is moved to the right side.
Enter between 07 and.

At this point, the backward movement of the yarn clamp shaft 105 is released by the air cylinder 140. Then, the yarn clamp shaft 105 moves to the left in the figure by the urging force of the spring 110 shown in FIG. 2, and the yarn guide 92 is provided between the collar portion of the yarn clamp shaft 105 and the collar portion of the winding shaft 107. The bobbin thread from is pinched.

Then, the motor 123 is further driven to slightly rotate the thread separating device with a 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, in the bobbin winding device, the bobbin thread tip from the bobbin winding 200 is clamped between the collar portion of the thread clamp shaft 107 and the collar portion of the winding shaft 105 as described above. It returns to and is in a standby state.

Further, in the above, the lower thread 150 is guided to the lower thread tension spring hole 8H by the inclination angle θ1 of the slit groove 8C, but the lower thread is moved by the rotation of the thread separating unit 116 accompanying the cutting operation of the lower thread 150. The movement of the thread 150 into the bobbin thread tension spring hole 8H becomes more reliable. That is, as shown in FIG. 16, during reverse rotation of the thread separating unit with moving knife 116, the lower thread is captured by the V-shaped notch 116C of the thread separating unit with moving knife 116, and the lower thread 150 is removed from the slit groove 8C. It is guided to the lower thread tension spring hole 8H through the lower thread lead-out hole 8G.

As described above, in this embodiment, the bobbin case open end portion 8 through which the lower thread 150 passes when the thread is hooked.
The inclination angle θ1 of the slit groove 8C with respect to E is made steep so that the bobbin thread can be moved from the thread hooking position B to the bobbin thread outlet hole 8G without using a bobbin thread guiding auxiliary mechanism such as a wiper mechanism. In addition to being able to easily perform the positional relationship in the bobbin axial direction between the bobbin thread leading hole 8G and the bobbin thread tension spring hole 8H, the bobbin case has the same level or the bobbin thread leading hole 8G is more than the bobbin case for the bobbin tension spring hole 8H. 8 is set so as to be located on the side opposite to the open end edge of No. 8, and the bobbin thread 150 guided to the bobbin thread lead-out hole 8G.
Can be easily guided directly to the lower thread tension spring hole 8H without a lower thread guiding auxiliary mechanism such as a wiper mechanism, so that the thread hooking operation can be successfully completed. Has become.

Further, the bobbin case open end portion 8E through which the bobbin thread 150 passes during threading is chamfered so that the cross section in the axial direction of the bobbin has a curved surface. Since the yarn breakage does not occur even when it comes into contact with 8E, it is possible to improve the reliability of the device.

In addition, in the above bobbin winding device, the bobbin winding device shown in FIGS.
When the conventional bobbin case shown in FIG. 5 is applied, the bobbin thread 150 stops at the slit groove 8CC in the state shown in FIG. 14, and the wiper mechanism needs to be re-operated. That is, again the air cylinder 134
The wiper 130 to the shaft 1 as shown in FIG.
Rotate about 180 around 29, slit 8CC
Hook the thread portion derived from the
It is necessary to guide the bobbin thread portion that has entered the slit 8CC to the bobbin thread tension hole 8GG below the bobbin thread tension spring 8D, and further to the bobbin thread tension spring hole 8H located on the left side in the drawing. .

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 bobbin case 8 is provided with the thread 150 led out from the opening 8A, as shown in FIG.
A chamfer 8a is provided to facilitate the movement to the thread hooking position 8B on the lower thread tension spring side of the bobbin case 8. However, this is just in case, and the effect of the present invention can be obtained without the chamfer 8a. It goes without saying that you can get

Further, the function of pulling the bobbin thread 150 to the opening 8A of the bobbin case 8 at the time of bobbin thread winding may be replaced by another one having a simple structure other than the wiper mechanism, or the bobbin thread winding device may be provided with a wiper mechanism. If not, the wiper mechanism having a complicated structure is completely unnecessary and the cost of the device can be reduced.

Further, as described above, due to the effect of the inclination angle θ1 of the slit groove 8C, the bobbin thread 1 without the wiper mechanism is provided.
50 can be easily moved to the bobbin thread tension spring hole 8H. Therefore, the shape of the wiper 130 can be made such that when the bobbin thread is wound around the bobbin 7 in the bobbin winding initial operation, the bobbin thread 150 is reliably brought close to the opening 8A of the bobbin case. The shape is to move the bending point 130a of the wiper 130 in FIG. 11 upward in the drawing. As a result, the bobbin thread 150 is guided upward to the left from the horizontal state shown in FIG. 11, but it is possible to prevent the winding failure that is guided to the upper side of the bobbin case 8 due to the loosening of the bobbin thread, and improve the reliability.

The bobbin case 8 of the present invention is not applied only to the bobbin winding device of the above-mentioned embodiment, in short, the bobbin is automatically wound around the bobbin 7 built in the bobbin case 8. Along with this, the lower thread 150 wound around the bobbin 7 and led out from the opening 8A of the bobbin case 8 is passed through the slit 8C and the gap 8K between the open end 8E of the bobbin case 8 and the outer circumference of the bobbin, and the lower thread leading hole. 8G, and the lower thread 150 led out from this lower thread outlet hole 8G
Any bobbin thread winding device can be applied to other bobbin thread winding devices as long as it is a bobbin case 8 in which the bobbin case 8 is automatically threaded by being pulled out from the bobbin thread tension spring hole 8H. Needless to say.

[0076]

As described above, according to the bobbin case of the bobbin winding device of the first aspect, the inclination angle of the slit groove with respect to the bobbin case open end portion through which the bobbin thread passes during threading is set. , It is possible to easily move the bobbin thread from the thread hooking position to the bobbin thread lead-out hole without using a bobbin thread guide assist mechanism such as a wiper mechanism. The positional relationship in the axial direction of the bobbin with the tension spring hole is set so that the bobbin thread lead-out hole is located at the same level or on the side of the bobbin case opposite to the open end edge side of the bobbin case. Since the lower thread guided to the lower thread tension assisting mechanism such as the wiper mechanism can be easily guided directly to the lower thread tension spring hole, the thread hooking operation is excellent. It will be possible to complete it.

According to the bobbin case of the bobbin winding device of claim 2, in addition to the bobbin case of claim 1, the bobbin case open end portion through which the bobbin thread passes during threading has a curved cross section in the bobbin axial direction. Since the chamfering process is performed so that the yarn breakage does not occur even when the bobbin thread comes into contact with the open end edge portion of the bobbin case during threading, reliability can be improved.

[Brief description of drawings]

FIG. 1 is a front 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 cross-sectional view of a thread hooking lever.

8A and 8B are views showing a bobbin case adopted in the above embodiment, wherein FIG. 8A is a perspective view and FIG. 8B is a partial cross-sectional view of an open edge portion in the bobbin axial direction.

9 is a development view of the bobbin case shown in FIG.

FIG. 10 is a front view of the essential part showing the thread clamping operation in the initial state of the same apparatus.

FIG. 11 is a front view of the essential part showing the bobbin winding operation on the bobbin of the same apparatus.

FIG. 12 is a front view of an essential part showing a bobbin winding operation and a yarn releasing operation on the bobbin of the same apparatus.

FIG. 13 is a plan view of an essential part showing the bobbin thread guiding operation to the slit of the bobbin case of the same apparatus.

14 is a plan view of an essential part showing a bobbin thread guiding operation following the bobbin thread guiding operation to the slit in FIG. 13. FIG.

FIG. 15 is a front view of the main part showing the bobbin thread hooking operation under the bobbin thread tension spring of the bobbin case of the above apparatus.

FIG. 16 is a front view of the essential part showing the bobbin thread cutting operation of the same apparatus.

FIG. 17 is a front view of an essential part showing a bobbin thread hooking operation under a bobbin thread tension spring of a bobbin case when a conventional bobbin case is applied to the above apparatus.

FIG. 18 is a front view of the thread tension varying means applied to the embodiment.

FIG. 19 is a perspective view of an automatic bobbin thread feeder to which the same upper and lower thread winding device is applied.

FIG. 20 is a front view of FIG. 19;

FIG. 21 is a plan view of FIG.

22 is a side view of FIG. 19. FIG.

FIG. 23 is a front view showing a relationship among a rotating arm, a forward / backward moving lever, and a guide shaft that constitute the same upper and lower yarn automatic feeders.

FIG. 24 is a perspective view of a bobbin case in the related art.

FIG. 25 is a development view of the bobbin case shown in FIG. 24.

[Explanation of symbols]

 7 bobbin 8 bobbin case 8A bobbin case opening 8C slit groove 8D bobbin thread tension spring 8DD bobbin thread tension spring end 8E bobbin case open end 8e chamfering 8G bobbin thread lead-out hole 8H bobbin thread tension spring hole 8K bobbin Gap between the open edge of the case and the outer circumference of the bobbin 150 Lower thread θ1 Slit angle of slit groove

Claims (2)

[Claims] 1. A bobbin contained in a bobbin case is automatically wound with a bobbin thread, and the bobbin thread wound around the bobbin and led out from an opening of the bobbin case is connected to an open end of the bobbin case and the bobbin case. The bobbin case is introduced through the gap with the outer circumference and the slit groove into the lower thread lead-out hole, and the lower thread led out from the lower thread lead-out hole is led out from the lower thread tension spring hole under the lower thread tension spring end. A bobbin case that is applied to a bobbin thread winding device that automatically thread-threads to the bobbin case. The bobbin case is steeply inclined, and the positional relationship between the bobbin thread discharge hole and the bobbin thread tension spring hole in the bobbin axial direction is the same level, or the bobbin thread derivation hole is opposite to the bobbin case from the bobbin thread tension spring hole. Located on the open edge side Bobbin case of the bobbin thread winding apparatus comprising set to so that. 2. The bobbin case for the bobbin winding device according to claim 1, wherein the bobbin case open end portion through which the bobbin thread passes when the thread is hooked is chamfered so that the bobbin axial cross section becomes curved. Bobbin case for bobbin winding device.