JPH0975571A - Residual thread removing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve quality and reliability of a device by effectively removing residual thread to prevent failures at latter stages. SOLUTION: This device is constructed in such a way that a gap expansion means 70 for the bobbin thread extension spring raises the bobbin thread expansion spring from the circumference of a bobbin case 2 so that a gap between the bobbin thread expansion spring and the circumference of the bobbin case 2 is widen, and at this time, a thread pulling action is performed by pulling means 760 and 761, and bumped thread clogged or to be clogged is passed through the widen gap and removed from under the bobbin thread expansion spring so that a thread pulling action can be continued.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a residual yarn removing device.

[0002]

2. Description of the Related Art In a sewing machine for sewing using an upper thread and a lower thread, particularly for an industrial sewing machine which performs high-speed sewing work, it is necessary to frequently replace a bobbin wound with a lower thread. There is. Generally, when the bobbin thread is consumed or the remaining amount is low, the sewing machine operation is temporarily stopped, the bobbin case is removed from the hook, the bobbin residual thread is removed, and the bobbin thread is wound. The bobbin wound on the bobbin is housed in the bobbin case again, the wound bobbin thread is hooked on the bobbin case, and the bobbin thread derived from the bobbin case is cut for a predetermined length, and the bobbin case is removed from the bobbin case. A series of operations to attach it to is performed manually.

However, such a manual removal operation of the residual thread, a bobbin winding operation on the bobbin, a thread hooking operation, a thread cutting operation and a bobbin case replacement operation are extremely inefficient and cause a decrease in productivity. Has become. Therefore, the applicant of the present application, in Japanese Patent Application Laid-Open No. 7-68071, etc., has automatically performed the above-mentioned residual thread removing work, bobbin winding work, thread hooking work, thread cutting work and bobbin case replacement work. And proposes an automatic bobbin thread feeder.

That is, in this automatic bobbin thread feeder, first, the bobbin case in which the bobbin thread has been consumed is taken out of the shuttle by the bobbin exchanging device and conveyed to the residual thread removing position, where it remains. After the residual thread of the bobbin is removed by the thread removing device, the bobbin is conveyed to the bobbin winding position, where a new bobbin thread is wound on the bobbin by the bobbin winding device, and the new bobbin thread is wound around the bobbin case. The bobbin thread that is drawn out is hooked on the bobbin case by the thread hooking device, the bobbin thread that is threaded out from the bobbin case is cut by the thread trimming device, and the bin case that has been subjected to such processing is bobbin changing device. It is adapted to be conveyed to the shuttle and mounted in the shuttle, so that the series of operations described above is automatically executed.

In addition to the residual yarn removing device described in Japanese Patent Application Laid-Open No. 7-68071, the residual yarn removing device described in, for example, Japanese Patent Application No. 7-30027 previously filed by the present applicant is basically used. As a configuration, a bobbin thread wound around the bobbin 7 and led out from a predetermined position below the bobbin thread tension spring 2D (near the bobbin thread tension spring hole 2E) through the bobbin case 2 bobbin thread derivation hole 2H is, for example, a rotator, A predetermined position (near bobbin thread tension spring hole 2E) by the thread drawing operation of drawing means such as air
From the bobbin case by pulling it out from the bobbin case in the tangential direction.
A configuration is adopted in which the residual yarn wound around the bobbin 7 is removed by rotating the bobbin 7 (see FIG. 12 for the configuration of the bobbin case).

[0006]

Here, in the above automatic bobbin thread feeder, in the case of handling thick count threads such as # 8, # 20 and # 30, the thread tightness at the time of sewing is improved. Therefore, the strength of the lower thread tension spring 2D of the bobbin case 2 is set to, for example, 40 gf to 60 gf as the lower thread tension, or higher in some cases. That is, the bobbin thread is pressed and compressed by the bobbin thread tension spring 2D with a strong force, and the gap between the bobbin thread tension spring 2D and the outer peripheral surface of the bobbin case 2 is very narrow.

When the yarn drawing operation (remaining yarn removing operation) by the above-mentioned remaining yarn removing device is performed in such a state, the bobbin 7
The bobbin thread drawn out from the bobbin thread is extremely strongly handled by the narrow gap between the bobbin thread tension spring 2D and the outer peripheral surface of the bobbin case 2, and the bobbin residual thread is pulled out as the bobbin residual thread is drawn out in combination with the twisting direction of the thread. A lump-shaped mass is formed in the lower thread around the lower thread lead-out hole 2H of the bobbin case 2, and the lump-shaped mass is sandwiched in the gap.

In order to pull out the lower thread in the state where the bump-like mass is sandwiched by the above-mentioned tangential drawing force (see FIG. 11 for the tangential drawing force), three times the normal drawing force is used. A pullout force of about 10 times or more is required in some cases.

Therefore, the pulling force is, for example, 80 gf to 1
In the above residual yarn removing device set to about 20 gf,
If the lump-shaped mass is sandwiched, it is difficult to pull out the residual yarn, and there is a problem in that the bobbin residual yarn remains but the residual yarn cannot be further removed. Incidentally, such a problem is that the yarn count is particularly large (the above-mentioned # 8, # 20,
It has been found from the experiments by the present inventor that the polyester spun yarn # 30) remarkably occurs.

Moreover, in the residual thread removing device described in the above-mentioned Japanese Patent Application No. 7-30027, if the bobbin rotation stops during removal of the residual thread, it is determined that the bobbin residual thread is completely removed. Due to this structure, it is mistakenly recognized that the removal of the residual yarn is completed even if the rotation of the bobbin is stopped due to the above-mentioned lump-like mass, and the residual yarn remains in the bobbin accommodated inside and the residual yarn is removed from the bobbin case 2. The bobbin case 2 in a state where it is derived to some extent is conveyed to the lower thread winding position where the lower thread winding process of the next step is performed.

That is, in the bobbin winding treatment step of the next step, the residual thread remaining in the bobbin case 2 and the residual thread derived from the bobbin case 2 are entangled with the bobbin thread to be newly wound. There is a problem that you can not wind a bobbin. As described in Japanese Patent Application No. 7-66808 filed by the applicant of the present application, such a problem is that the bobbin thread drawn from the bobbin case 2 is cut after the operation of the drawing means. The same applies to things.

[0012] Therefore, the present invention provides a residual yarn removing device in which removal of the residual yarn is satisfactorily completed and defects in the subsequent steps are prevented, thereby improving the quality and reliability of the device. To aim.

[0013]

In order to achieve the above object, a residual thread removing device according to a first aspect of the present invention comprises a bobbin housed in a bobbin case and rotatably supported, and a bobbin wound under the bobbin case. And a pulling-out means for pulling out a lower thread which is drawn out from a predetermined position under the lower thread tension spring through the thread pulling hole, and the bobbin is rotated by the thread pulling operation of the pulling-out means to pull out and remove the lower thread of the bobbin. In the residual thread removing device configured as described above, bobbin thread tension spring clearance expanding means is provided to float the bobbin thread tension spring to widen the clearance between the bobbin thread tension spring and the outer peripheral surface of the bobbin case. A feature is that the yarn drawing operation of the drawing means is performed while expanding the clearance by the spring clearance expanding means.

According to the residual thread removing device of the first aspect, the bobbin thread tension spring gap expanding means floats the bobbin thread tension spring against the outer peripheral surface of the bobbin case, so that the bobbin thread tension spring and the bobbin case outer peripheral surface are separated from each other. The gap between them is widened, and at this time, the yarn drawing operation by the drawing means is performed. Therefore,
The lump-shaped mass that is sandwiched or may be sandwiched in the gap passes through the widened gap and is moved from under the lower thread tension spring to continue the thread drawing operation.

At this time, various kinds of bobbin thread tension spring gap expanding means can be adopted, but as described in claim 2,
For example, it is possible to employ moving means for moving at least one of the bobbin case and the drawing means relative to the other so that the lower thread tension spring floats. In addition, this transportation means
If the bobbin case used in the bobbin thread automatic feeding device is a movable bobbin exchanging device, it is not necessary to newly provide a bobbin thread tension spring gap expanding means.

In order to achieve the above object, the residual thread removing device according to a third aspect of the invention is, in addition to the first aspect, the operation of the lower thread tension spring gap expanding means based on at least one of the yarn count and the yarn type. The determination means for determining the presence or absence was provided.

According to the residual yarn removing device of the third aspect, for the yarn having a possibility that, for example, the yarn may have a bump-like mass by the judging means based on at least one of the yarn count and the yarn type. Only the lower thread tension spring gap expanding means is operated. Therefore, this operation is omitted for yarns that do not require the operation of the gap expanding means. Further, for example, as described in claim 2, the lower thread tension spring is floated by the movement by the moving means (the lower thread is pulled out at an angle with respect to the lower thread tension spring), that is, the lower thread tension spring. In addition, when the lower thread, which does not require the operation of the gap expanding means, is pulled out while being pressed, the occurrence of thread breakage caused by this operation can be prevented.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. The automatic bobbin thread feeder of the present embodiment, as shown in FIG.
And a bobbin exchanging device (moving means; bobbin thread tension spring gap expanding means) 160. The bobbin exchanging device 160 includes a bobbin winding device 162 and a bobbin winding device. The bobbin case 2 can be moved to the position C, the residual thread removing position B of the residual thread removing device 161, the shuttle position (bobbin case attaching / detaching position) A, and the bobbin case attaching / detaching position D of the dummy shaft (bobbin case holding means) 6. It is configured.

The lower thread winding position C and the residual thread removing position B are
As shown in FIG. 1, a range V below the transport shaft 4 and a range W on the rotation fulcrum 103 side when the sewing machine bed 101 is raised from the upright plane along the coaxial line, and the rotation of the bobbin case gripping means. It is located at the opposite position of the locus. The residual thread removing position B is arranged below the lower thread winding position C. In addition, the residual yarn removing position B is in the transport axis direction (see FIG.
1 is a position slightly advanced from the retracted position of the bobbin case holding means (position advanced until the reflection type optical sensor 500 can detect rotation of the bobbin 7 (details will be described later)). The position of the lower thread winding position C in the transport axis direction is a position where the bobbin case gripping means is advanced a little from the retracted position (a position advanced to the paper surface in FIG. 1). .

When the bobbin case 2 is moved to the residual thread removing position B of the residual thread removing device 161 by the bobbin exchanging device 160 in order to remove the residual thread of the bobbin,
Before that, a first position B1 facing the dummy shaft 6 (a position where the dummy shaft D is retracted unlike the above-mentioned dummy position D), and a second position between the first position B1 and the residual yarn removing position B are provided. The bobbin case 2 is moved to the position B2 (see FIG. 8; details will be described later). Needless to say, these positions B1 and B2 are opposite to each other on the rotation trajectory of the bobbin case holding means.

In FIG. 1, reference numeral 102 is a sewing machine table, 106 is an oil pan, 104 and 105 are lower shafts, and X is a rotation locus on the outer peripheral side when the sewing machine head is raised. ing.

The above-mentioned automatic bobbin thread feeder is a sewing machine bed 10.
It is provided in the lower part of 1. First, the bobbin exchanging device 160 will be described below with reference to FIGS. 2 to 6. 2 to 6, reference numeral 1 is a shuttle to which the bobbin case 2 is mounted, reference numeral 1a is a shuttle shaft, and reference numeral 3 is provided upright on the main base attached to the main body of the sewing machine and arranged directly below the shuttle 1. 3A and 3B respectively show a base plate serving as a support body. A base end 4a of a carrier shaft 4 having an axis parallel to the shuttle shaft 1a is fixed to the base plate 3, and the carrier shaft 4 is fixed to the base plate 3a. It is in a cantilevered state.

A transport block 12 is rotatably and slidably supported on the transport shaft 4 on the tip 4b side (opposite to the base plate) of the transport shaft 4. As shown in FIG. 2 in particular, the transport block 12 has a shape in which the outer peripheral surface of a cylinder is cut at two locations along the axial direction so that the cut surfaces face each other. On each cut surface of the transport block 12, the transport plate 1 bent in an L shape is formed.
One plate-like portion forming the L-shape of 0 and 10 is fixed. Further, the other plate-shaped portions forming the L-shape are in a state of facing each other with the axis interposed.

Each of the transport plates 10 and 10 has a holding portion 11 and 1 which is bent so as to extend toward the shuttle along the axial direction.
One end of each of the holding parts 11 and 11 is fixed, and bobbin case gripping means (not shown) for gripping or releasing the bobbin case is provided at the other end of the holding parts 11 and 11 (end facing the shuttle). Are fixed respectively. The bobbin case gripping means is described, for example, in an automatic bobbin thread feeder of Japanese Unexamined Patent Publication No. 5-192476 or in a sewing machine of Japanese Patent Application No. 5-121960 previously filed by the present applicant. Including a pair of electromagnet adsorption heads, which are already applied, for example, Japanese Patent Application No. 5-1163 filed by the applicant earlier.
Appropriate ones such as those with lever claws described in the automatic bobbin thread feeder of the sewing machine of No. 63 can be adopted. The point is that the bobbin case 2 is provided with a facing member (for example, a hook) as needed. Anything that can be attached to and detached from 1) may be used.

Returning to FIG. 1 to FIG. 6 again, a rotary gear 13 is fixed to the outer periphery of the carrying block 12, and the rotary gear 13 has a hook shaft 1a as shown in FIG. A drive gear 19 having an elongated shape meshes with the direction. One end of the drive gear 19 is rotatably supported by a portion of the motor fixing plate 21 attached to the base plate 3 that protrudes toward the other end of the transport shaft, and the other end is fixed to the motor fixing plate 21. The rotary shaft 20 is directly connected to the output shaft of the rotary motor 20.

Therefore, when the rotation motor 20 rotates, the transfer block 12 is moved through the drive gear 19 and the rotation gear 13.
Also, a rotating arm 70 as a rotating means composed of the transport plates 10, 10 and the holding portions 11, 11 is adapted to rotate. In the present embodiment, the rotating operation of the rotating arm 70 is performed when the rotating arm 70 is in the retracted position (see FIGS. 3 to 5).

A not-illustrated stop ring, for example, is fixed to the outer periphery of the transport block 12 on the fixed end side of the transport shaft 4 with respect to the rotary gear 13, and the rotary gear 13 and the stop on the outer periphery of the transport block 12 are fixed. A linear motion collar 14 is rotatably supported between the ring and the ring.

As shown in FIGS. 2 to 4, one end of a rack 16 movably supported in parallel with the shuttle shaft 1a is fixed to the translation collar 14, and the rack 16 is fixed.
The pinion 17 meshes with the other end of the. The pinion 17 is fixed to the output shaft of a moving motor 18 attached to the base plate 3.

Therefore, when the moving motor 18 is driven, the linear movement collar 14 and the rotating arm 70 move along the axial direction of the transport shaft 4 together with the rack 16 via the pinion 17. That is, the rotating arm 70
Can rotate with respect to the transport shaft 4 and can slide along the transport shaft 4.

A sensor fixing plate 33 is attached to the open end side of the conveying shaft 4, and a rotation sensor 31 including a light emitting element 31a and a light receiving element 31b is attached on the sensor fixing plate 33. ing. In addition, as shown in FIGS. 2 and 3, the sensor plate 3 is attached to the rotating arm 70.
2 is fixed, and the rotation sensor 31 and the sensor fixing plate 3 so that the sensor plate 32 can pass between the light emitting element 31a and the light receiving element 31b when the rotation arm 70 rotates.
3 and the position of the sensor plate 32 are adjusted.

As shown in FIGS. 2 and 4, the base plate 3 has a linear motion sensor 41 having the same structure as the rotation sensor 31.
Is attached. Further, the sensor plate 15 is fixed to the rack 16, and when the rotating arm 70 is linearly moved, the sensor plate 15 is a light emitting element 41 a of the linear movement sensor 41.
The positions of the linear motion sensor 41 and the sensor plate 15 are adjusted so that they can pass between the light receiving element 41b and the light receiving element 41b.

That is, when the bobbin case gripping means is moved to the retracted position, the sensor plate 15 causes the linear motion sensor 4 to move.
The first light emitting element 41a and the light receiving element 41b are shielded from each other, whereby the movement of the bobbin case holding means to the retracted position is detected. Then, this time, the origin position is searched at the retracted position. That is, if the bobbin case gripping means is rotated at the retracted position and the position where the sensor plate 32 shields the light emitting element 31a and the light receiving element 31b is set as the origin position, for example, the bobbin case gripping means is rotated to this position. Then, it returns to the origin position. Also,
When, for example, a pulse motor is used as the rotation motor 20, the number of pulses of the pulse motor is counted to move the bobbin case gripping means to the hook position A, the bobbin thread winding position C, and the residual thread removing position. B, first position B
The rotation can be controlled to the first position, the second position B2, and the dummy position D.

Here, in the present embodiment, the turning arm 70 is at the retracted position and the position where the bobbin case 2 held by the bobbin case holding means faces the shuttle 1 is set at the turning arm 70 (bobbin case holding). Means) as the origin position.

A dummy shaft 6 as a bobbin case holding means is provided at a position on the base plate 3 opposite to the rotation locus of the bobbin case gripping means, which is directly below the shuttle 1 as shown in FIG. Is fixed. As shown in FIG. 6 in particular, the dummy shaft 6 has the same structure as the inner hook shaft 5, and the bobbin case 2 in which the bobbin is housed.
The bobbin case 2 can be held by pushing. Then, the existing bobbin locking claw 2d of the bobbin case 2 that has been pushed in is configured to engage with the locking groove of the detent member 5aa projecting near the dummy shaft 6, as shown in FIG. Has been done. That is, the bobbin case 2 is positioned and held at a predetermined position.

At the residual thread removing position B, a residual thread removing device 161 is arranged. The residual yarn removing device 161 will be described below with reference to FIGS. 7 and 8. In the figure, reference numeral 79 indicates a rotation axis. The rotary shaft 79 penetrates the base plate 3 and both side plates 8 of the U-shaped residual thread bracket 80 arranged so as to sandwich the base plate 3.
0a and 80b are rotatably bridged, and both ends project outward from the side plates 80a and 80b, respectively.
A drive roller 760 as a rotating body is fixed to a shaft portion protruding from the front side (left side in FIG. 7) side plate 80a of the residual thread bracket 80, and the back side (right side in FIG. 7) side plate 8
The residual yarn roller drive pulley 83 is attached to the shaft portion protruding from 0b.
Has been fixed.

A motor bracket 3a is arranged on the inner side of the base plate 3, and a residual thread winding motor 86 is fixed to the motor bracket 3a. A residual yarn winding pulley (not shown) is fixed to the output shaft of the residual yarn winding motor 86, and a residual yarn belt (not shown) is stretched between the residual yarn winding pulley and the residual yarn roller driving pulley 83. ing.

Therefore, when the residual thread winding motor 86 is driven, its rotation is transmitted to the rotary shaft 79 via the residual thread winding pulley, the residual thread belt, and the residual thread roller driving pulley 83 so that the drive roller 760 rotates. Has become.

The side plate 80 of the residual thread bracket 80 is also provided.
As shown in FIG. 7, a U-shaped rotating arm 85 is arranged between a and the base plate 3. A rotary shaft 80c is rotatably provided on both side plates 85a and 85b forming a U shape of the rotary arm 85, and a shaft portion protruding further from the front side plate 85a toward the front side serves as a rotating body. The driven roller 761 is fixed. These rollers 760 and 761 are in a state in which the pull-out means is constituted.

A shaft 87 is fixed to the rotating arm 85. The shaft 87 penetrates the base plate 3 and is rotatably attached to both side plates 80a and 80b of the residual thread bracket 80. The rotary arm 8 is coaxial with the shaft 87.
From the left side plate 85b of FIG. 7 toward the right side from the left side in FIG. 7, a cup-shaped friction clutch plate 250b whose open end faces the back side, a clutch pressure contact spring 250c, and a cup-shaped storage whose open end faces the front side. A part 250a and a rotary arm drive gear 88 having the storage part 250a fixed to the ends are arranged in order, and these friction clutch plates 250b,
The shaft of the clutch pressure contact spring 250c, the housing portion 250a, and the rotary arm drive gear 88 is penetrated by the shaft 87, and the shaft 8 is rotated.
It is in a state of being rotatably supported by No. 7. The clutch pressure contact spring 250c is housed between the friction clutch plate 250b and the storage portion 250a, and is arranged in the clutch pressure contact spring 250c by a plurality of pins (not shown) fixed between the friction clutch plate 250b and the storage portion 250a. Rotation in the friction clutch plate 250b and the storage portion 250a is restricted.

A rotary arm transmission gear 90 meshes with the rotary arm drive gear 88, and the rotary arm transmission gear 90 is fixed to an intermediate portion of the rotary shaft 79.

That is, the side plate 85b on the inner side of the rotary arm 85 and the friction clutch plate 250b are in a pressure contact state by the pressure contact force of the clutch pressure contact spring 250c, and the rotary drive force of the rotary arm drive gear 88 is stored in the storage portion 250a and the clutch. Friction is transmitted to the rotary arm 85 via the pressure contact spring 250c and the friction clutch plate 250b.
It can be rotated with the fulcrum as a fulcrum.

Therefore, when the residual yarn winding motor 86 is driven in the CCW direction in FIG. 8 and the drive roller 760 is rotated in the same direction, the rotational driving force is inverted by the rotary arm drive gear 88 and is inverted. The rotational driving force is frictionally transmitted to the rotary arm 85 via the storage portion 250a, the clutch pressure contact spring 250c, and the friction clutch plate 250b, and the rotary arm 85 rotates about the shaft 87 in the CW direction to the drive roller 760. On the other hand, the driven roller 761 is separated so that a space is generated between the two rollers 760 and 761. The position of the driven roller 761 at this time is referred to as a separated position.

When the residual yarn winding motor 86 is driven in the CW direction and the drive roller 760 is rotated in the same direction, the rotational driving force is inverted by the rotary arm drive gear 88 and the inverted rotational drive is performed. The power of the storage section 250
a, clutch pressure contact spring 250c, friction clutch plate 250
Friction is transmitted to the rotary arm 85 via b, the rotary arm 85 rotates about the shaft 87 in the CCW direction, and the driven roller 761 is pressed against the drive roller 760. The position of the driven roller 761 at this time is referred to as a discharge position where the lower thread is wound and discharged.

Further, when the driven roller 761 is pressed against the driving roller 760, the rotation of the rotary arm 85 about the shaft 87 in the CCW direction becomes impossible, and the friction clutch plate 250b and the rotary arm are not rotated. A slip occurs between the inner side plate 85b of the plate 85 and the side plate 85b, and a state in which a further pressing force is not applied (a state in which the pressing force is maintained) is maintained, and the drive roller 760 continues to rotate in the CW direction as it is. Has become.

Incidentally, the rotating arm 85 and the driven roller 76.
When 1 rotates about the shaft 87 as a fulcrum, the driven roller 76
A notch or the like is appropriately formed on the side plate 80a so that the rotary shaft 80c for fixing 1 does not hit the front side plate 80a of the residual thread bracket 80.

Further, the residual yarn removing device 161 is provided with an air nozzle 100 for blowing air (see FIG. 8). An electromagnetic valve (not shown) is connected to the air nozzle 100, and an air source (not shown) is connected to the electromagnetic valve.

The air nozzle 100 includes a rotating arm 7
0 toward the first position B1 (position facing the dummy shaft 6; see FIG. 8A) toward the lower thread leading portion (near the lower thread tension spring hole 2E) of the bobbin case 2. Even if the lower thread led out from the lower thread lead-out portion adheres to the outer peripheral surface or the end surface of the bobbin case 2 due to static electricity or the like, air ( The lower thread end portion M can be surely hung downward by blowing air for lower thread dropping.

The air nozzle 100 also includes a rotating arm 7.
When the bobbin case 2 is positioned at the second position (the position rotated upward from the position B1 above; see FIG. 8B to FIG. 8E) 0, the bobbin thread end portion M hanging from the bobbin thread lead-out portion of the bobbin case 2 is set to 0. It can also be blown to the work position. The working position referred to here is a position approximately in the middle between the driven roller 761 and the driving roller 760 when the rotary arm 85 is opened near 90 °, and the lower thread end portion M is not blown to the working position. This is achieved by blowing air (air for blowing the lower yarn) from the air nozzle 100 toward the outer peripheral surface of the bobbin case 2 to create a flow along the outer peripheral surface.

The air nozzle 100 also has a rotating arm 7.
When the bobbin case 2 is located at the residual thread removal position (position further rotated upward from the position B2; see FIG. 8 (f)) B by 0, the direction is opposite to the rotational tangential direction of the driven roller 761. Air (air for preventing thread entanglement) can be blown toward a position on the lower right of the driven roller 761 in the figure, and the lower thread discharged by the rotation of the rollers 760 and 761 is driven roller 761 or its driven roller 761. It is designed so that it does not get entangled with nearby members.

That is, the bobbin case 2 is moved to each of the first, second and residual thread removing positions by the rotating arm 70, whereby the lower thread dropping processing and the lower thread blowing processing are performed by one air nozzle 100. The yarn entanglement prevention process is performed in three steps, and the cost can be reduced and the air piping can be simplified.

Further, the residual thread removing device 161 has a structure shown in FIG.
In order to prevent the lower thread discharged by the rotation of the rollers 760 and 761 from being entangled with the drive roller 760 and the members in the vicinity thereof, as shown in FIG. There is also provided an air nozzle 100a capable of blowing air toward a position on the lower left of the roller 760 in the drawing.

The solenoid valve for the air nozzle 100 is connected to the air nozzle 100a. Further, in the flow path between the air nozzle 100a and the solenoid valve,
An electromagnetic valve (not shown) is further provided so that the air from the air nozzle 100a can be discharged or blocked.

Further, as shown in FIG. 7, the front side plate 80a of the bracket 80 in the residual yarn removing device 161, as shown in FIG.
00 is attached. This reflection type optical sensor 500 is
When the bobbin case 2 is set at the residual thread removing position B according to the rotating arm 70 and is opposed (when the residual thread can be removed), one place is provided on the side surface of the bobbin 7 as shown in FIG. It is arranged so as to face the reflecting hole 7a.

Therefore, when the bobbin 7 rotates during the residual thread removing operation by the residual thread removing device 161, the reflection type optical sensor 50
From 0, continuous pulse waves are output as shown in FIG. Here, when the bobbin is removed from the bobbin 7, the rotation of the bobbin 7 is stopped. Therefore, the output of the reflective optical sensor 500 can be used to confirm the completion of the removal of the residual yarn. The determination means for making such a determination is
It is incorporated in the residual yarn removing device control means 403 (see FIG. 14) described later, and the driving of the residual yarn removing device 161 is stopped in accordance with the determination of the residual yarn removing completion.

At the bobbin winding position C, the bobbin winding device 16 is provided.
2 are provided. As the lower thread winding device 162, for example, an apparatus that can automatically wind the lower thread around the bobbin by rotating the bobbin by driving a motor or the like is adopted. The lower thread winding device 162 includes a bobbin drive mechanism E, an air guide mechanism G, and a thread tension applying mechanism F, as shown in a simplified manner in FIG.

The thread tension applying means F is for applying tension (resistance) to the bobbin thread from a bobbin winding (not shown) as a bobbin thread supply source, and for feeding the bobbin thread downstream. Guides the lower thread end portion from the thread tension applying means F into the opening of the bobbin case 2.

As shown in FIG. 7, the bobbin drive mechanism E drives the take-up motor M2 to transfer the rotational drive force to the motor shaft pulley 52, the timing belt 51, and
It is transmitted to the winding clutch plate via the winding pulley 50b, and the clutch claw 50a of this winding clutch plate is accommodated inside the bobbin case 2 that has been conveyed to the bobbin winding position C by the bobbin exchanging device 160. Bobbin 7 hole 7b
(See FIG. 12) A structure is adopted in which the lower thread can be automatically wound around the bobbin 7 by clutching and rotating the bobbin 7.

A thread hooking device is attached to the lower thread winding device 162. This yarn hooking device drives this rotation driving force by driving a yarn handling motor (not shown).
Through the moving knife rotating gear, the bobbin case 2 set at the bobbin winding position C is transmitted to the moving knife thread separating unit 116 rotatably arranged around the bobbin case 2, and the moving knife thread separating unit 116 is transmitted. By rotating the bobbin 7 around the bobbin 7 around the bobbin 7 through the gap between the open end edge of the bobbin case 2 and the outer circumference of the bobbin 7, the bobbin 7 is wound around the bobbin 7 and is guided to the thread hooking position 2B. It is configured so that it can be guided to the slit groove 2C and can be led out from the vicinity of the lower thread tension spring hole 2E through the lower thread lead hole 2H under the lower thread tension spring 2D.

Furthermore, the lower thread winding device 162 is provided with a thread cutting device. This thread trimming device has a lower thread tension spring 2D, a lower thread leading hole 2H, and a lower thread tension spring hole 2H.
The lower thread drawn out from the vicinity of E is separated by the rotating operation of the moving knife thread separating unit 116, and can be cut between the fixed knife 91 and the lower thread supply source.

Incidentally, the lower thread winding device (including the thread hooking and thread cutting device) 162 is not limited to the one having the above construction, and the lower thread can be automatically wound around the bobbin 7. Any device may be used as long as it is capable of threading and thread cutting. For example, the automatic lower thread feeder of JP-A-5-192476 and Japanese Patent Application No. 5-1 previously filed by the applicant.
Appropriate ones can be adopted, including the bobbin exchanging device of the sewing machine described in No. 21960 and the bobbin winding device described in the bobbin exchanging device of the sewing machine of Japanese Patent Application No. 5-116363.

When the residual yarn removing device 161 and the bobbin winding device 162 contact the base plate 3 shown in FIG. 1, the base plate 3 is appropriately cut. Further, in FIG. 1, the residual thread removing position B, the bobbin thread winding position C, and the dummy shaft 6 are shown.
The bobbin attaching / detaching position D is close to the holding portion 11
Is exaggerated and described. Therefore, there is a concern that the holding unit 11 may contact the residual yarn removing device 161 and the bobbin winding device 162, but in reality, a sufficient space is secured to prevent such contact.

An operation panel (not shown) is attached to the bobbin thread automatic feeder, and the operation panel has an operation panel (not shown).
As shown in FIGS. 13 and 14, a power switch 302, an operation switch, a thread type, a thread count input switch 309, and a residual thread removal skip mode selection switch connected to the lower thread automatic feeder (for example, stitch connection is possible. A switch 319 that is turned on when performing ground sewing or the like, an error display window 316 as a display unit, and the like are provided. Next, a bobbin thread automatic supply control device for controlling the operation of the bobbin thread automatic supply device will be described.

First, as shown in FIG. 13, a sewing machine main body 300 for executing a predetermined sewing operation is provided with a power switch (power switch on the sewing machine side) 302 for turning on / off the main power supply. A sewing machine power supply monitoring means (sewing machine power supply monitoring circuit) 301 for determining whether the power switch 302 is on or off is additionally provided. This sewing machine power source monitoring means 301 is a power source energization control device 4 which will be described later.
50 (see FIG. 14), specifically, for example, a power source of + 5V in the sewing machine control circuit is monitored, and the OFF detection signal of the power switch 302 is sent to the power supply energization control device 450. It has a function of outputting to the energization timing control means 315 (described later).

On the other hand, the main power supply is also connected to the DC power supply circuit 304 via the relay switch 303 which constitutes the control switch means of the power supply energization control device 450 described later. The DC power supply circuit 30 of the power supply energization control device 450
4 is a bobbin thread winding device 162 described above.
(To be precise, it also includes a thread hooking and thread cutting device), a residual thread removing device 161 and a bobbin exchanging device 160, which are connected so as to supply drive currents, respectively, and are connected to the relay switch 3
Each device 1 based on the ON / OFF signal emitted from 03
It is configured to control the energization of 60, 161, 162.

In addition, the lower thread winding device 162 has a structure shown in FIG.
3, the bobbin drive motor M2 driver 310a, the motor knife driver 116b 310b for the moving knife, the solenoid valve driver 310c, etc. are connected to the bobbin exchanging device 160.
8 driver 311a, rotation motor 20 driver 31
1b etc. are respectively connected, and the residual yarn removing device 1
A driver 312 a for the residual thread winding motor 86, a driver 312 b for an electromagnetic valve, etc. are connected to 61.
A driver 313 is connected to the relay switch 303.

Then, these drivers 310a-310
c, 311a, 311b, 312a, 312b, 313
A CPU (Central Processing Unit) 306 and a ROM attached to the CPU 306 via an i / o port 305.
It is connected so that each signal from 307 and RAM 308 is input. Then, each of the above devices 162, 16
As shown in FIG. 14, 1, 160 execute the above-described predetermined operation (details will be described later) while being controlled by the automatic bobbin thread feeder control means 400, and enable this execution. The lower thread automatic feeding device control means 40
The energization state to 0 is configured to be controlled by the power supply energization control device 450.

That is, as shown in FIG. 14, the bobbin thread automatic feeding device control means 400 includes a bobbin winding device control means 401 and a bobbin exchange device control means (bobbin transport
Attachment / detachment device control means) 402 and residual yarn removal device control means 4
03, and each of these control means 401,
A predetermined drive current is supplied from the DC power supply circuit 304 of the power supply energization control device 450 to the parts 402 and 403, and an operation command signal from the energization timing control means 315 of the power supply energization control device 450 is similarly applied. ing. The energization timing control means 315 has a function of constantly monitoring the operations of the bobbin winding device 162, the residual yarn removing device 161, and the bobbin exchanging device 160.

The energization timing control means 315 is also provided.
A detection signal from the above-mentioned sewing machine power source monitoring means 301, that is, a signal which detects the on / off state of the sewing machine power source switch 302, is applied to. Then, when the energization timing control means 315 receives the off detection signal of the sewing machine power switch 302, the energization timing control means 315 completes the processing operation of the device that is in the middle of operation at the time of the power-off, and then is scheduled to be performed following this processing operation. If there is a necessary processing operation before the bobbin replacement, the processing operations are sequentially completed to enter the bobbin replacement standby state, that is, the processing necessary for the bobbin replacement (remaining thread removing processing, bobbin winding processing, thread hooking processing). , The thread cutting process) is completed, and the operation command signal for moving the bobbin case to the retracted position (origin position) facing the hook is provided to each of the control means 401, 402, 403 described above. doing.

The energization timing control means 315 is also provided.
Is an operation command signal for advancing the bobbin case, which has been subjected to the processing necessary for bobbin replacement, from the origin position to a position where the bobbin case approaches the shuttle 1 when the bobbin case is in a standby state for bobbin replacement. To the bobbin exchange device control means 402 described above.

The energization timing control means 315 is also provided.
Has a function of issuing a processing completion signal to the control switch means 303 when the bobbin exchanging device 160 advances the bobbin case from the origin position to the position where the bobbin case faces and approaches the shuttle 1. On the other hand, control switch means 303
Is composed of a power relay switch, a solid state relay, etc., and is always supplied with an AC drive current regardless of the sewing machine power switch 302. Then, the control switch means 303 is configured to output a turn-off command signal to the DC power supply circuit 304 upon receiving the processing completion signal from the energization timing control means 315 described above. DC power supply circuit 3 which received this OFF command signal
04 will stop the supply of the drive current to the control means 401, 402, 403 and the devices 160, 161, 162.

As described above, since the bobbin case, which has undergone the necessary processing for the bobbin exchange, is located at the position close to the hook 1 facing the hook 1, unless the bobbin in the hook 1 is forcibly retracted, It is difficult to intervene in the bobbin case, the bobbin that is opposed to the bobbin case, and the bobbin case. That is, the bobbin and the bobbin case are prevented from being inadvertently touched unless necessary.

Further, the energization timing control means 31
The processing completion signal issued from the RAM 5 is also applied to the RAM (nonvolatile memory) 308 as the cutoff information storage means. The RAM 308 is composed of a battery backup RAM, an EEPROM or the like,
Information on whether the power is cut off normally or abnormally (for example, at the time of power failure) is stored in the RAM 308.
On the other hand, the power cutoff normality / abnormality information stored in the RAM 308 is constantly referred to by the energization timing control means 315 side, and the power cutoff normality / abnormality information stored in the RAM 308 is energized timing control means 315. Has been confirmed in. The energization timing control means 315 is configured to issue an operation command signal for causing the control means 401, 402, 403 to perform a predetermined continuation process based on the confirmed normal or abnormal power-off information. ing.

The energization timing control means 315 is also provided.
A predetermined display means 316 is connected to the R
The power shutdown normal or abnormal information stored in the AM 308 is configured to be displayed.

Further, the energization timing control means 31
5 has a function of issuing an operation command signal to the bobbin exchanging device control means 402 described above so as to detect the origin from a position where the bobbin case is opposed to and approaching the shuttle 1 when the re-on detection signal of the sewing machine power switch 302 is received. Have

Further, the power supply energization control device 450 includes
Upon receiving the detection signal from the sewing machine power source monitoring means 301 and monitoring the operation of the bobbin exchanging device 160, the sewing machine power source switch 302 receives the re-on detection signal, and the origin is detected from the position where the bobbin case faces the hook 1 oppositely. When the origin is detected, it is determined whether or not the number of steps when the origin is detected is the same as the number of steps when the bobbin case is advanced to the position where the bobbin case is opposed to the hook 1. Before turning on the switch 302 again,
The manual intervention determination means 317 for determining that the bobbin and the bobbin case inside the bobbin and the bobbin case that are close to and facing the shuttle 1 have been intervened (taken some kind of treatment even if the trouble did not occur) Has been.

When the manual intervention determining means 317 determines that the manual intervention has occurred in the bobbin and the bobbin case before the sewing machine power switch 302 is turned on again, the display means 316 warns that the manual intervention has occurred. It is configured to display. That is, the operator is urged to check.

Further, when the manual intervention determining means 317 determines that the manual operation has not intervened in the bobbin and the bobbin case before the sewing machine power switch 302 is turned on again, the above-mentioned energization timing control means 315 makes a predetermined decision. The operation command signal for continuing the process is sent to each of the control means 40 described above.
1, 402, 403 respectively.

Further, the energization timing control means 315 is
The driven roller 761 is at the separated position (the position shown in FIG. 8B).
From the above to the discharge position (positions in FIGS. 8 (e) and 8 (f)), the movement is intermittent, and the movement amount for each intermittent movement is variable (large to small). It has a function of issuing an operation command signal to the yarn removing device control means 403.

Further, the energization timing control means 315 is
The rotation operation of the drive roller 760 when pulling out the yarn is intermittent and the rotation amount for each intermittent rotation operation is variable (small to large).
In order to achieve the following, it has a function of issuing an operation command signal to the residual yarn removing device control means 403.

Further, the energization timing control means 315 is
The rotation speed of the driving roller 760 when the yarn is discharged from the bobbin 7 to some extent is variable (from low speed to high speed)
In order to achieve the following, it has a function of issuing an operation command signal to the residual yarn removing device control means 403.

Further, the energization timing control means 315 is
As described above, the bobbin case 2 is moved to the first position B1 during the bobbin thread hanging process and is moved to the second position B1 during the bobbin thread drawing process.
2 has a function of issuing an operation command signal to the bobbin exchanging device control means 402 so that the bobbin exchanging device control means 402 is positioned at the residual yarn removing position B during the yarn entanglement prevention process.

Further, particularly when the energization timing control means 315 in this embodiment detects the stop of the rotation of the bobbin 7 from the above-mentioned reflection type optical sensor 500 during the removal of the residual yarn, the above-mentioned yarn type and yarn count input switch is used. When a bobbin thread of a predetermined thread type and thread count (described later in detail) is used based on the thread type and thread count previously input by 309, the bobbin case 2 is moved to the bobbin thread tension spring gap expansion position B3.
(Position higher than the residual thread removing position B; see FIG. 8G) to float the lower thread tension spring 2D to widen the gap between the lower thread tension spring 2D and the outer peripheral surface of the bobbin case 2. When an operation command signal is issued to the bobbin exchanging device control means 402 and a bobbin thread of a yarn type other than a predetermined number is used, the residual thread removing device control means 403 operates as if the residual thread removal is completed. It has a function of issuing a stop command signal.

That is, the thread type and thread count input switch 30
A determination means (not shown) for determining whether the bobbin exchanging device 160 floats the bobbin thread tension spring 2D based on the yarn type and the yarn count which are input in advance by the unit 9 is incorporated.

Further, when the bobbin exchanging device 160 performs the operation of floating the bobbin thread tension spring 2D, the energization timing control means 315, particularly in this embodiment, causes the drive roller 760 to perform the thread discharge rotation operation so that the remaining thread is operated. When an operation command signal is issued to the removing device control means 403 and the drive roller 760 is rotated by a predetermined amount, the bobbin exchanging device control means 402 is operated to return the bobbin case 2 from the lower thread tension spring gap expanding position B3 to the residual thread removing position B. It has the function of emitting a signal. Then, after that, the reflection type optical sensor 500
When the rotation stop of the bobbin 7 is detected from the above, it has a function of issuing an operation stop command signal to the residual thread removing device control means 403 because removal of the residual thread is completed.

Furthermore, especially when the energization timing control means 315 in this embodiment is used, for example, when performing ground stitching which enables stitching, that is, when the bobbin wound around the bobbin is completely used up, the residual thread is sewn. When the residual thread removal skip mode selection switch 319 is turned on when the removal is not required, the bobbin exchanging device control means 40 is configured to skip the residual thread removal processing and perform the next predetermined continuous processing.
2. It has a function of issuing operation command signals to the lower thread winding device control means 403.

Next, the control operation of the lower thread automatic feeder using such a controller will be described with reference to the flow charts shown in FIGS. Considering the ease of understanding, the explanation will be given from the start of the sewing operation. That is,
First, in step 5 in FIG. 15, when the RAM (nonvolatile memory) 308 is cleared, the automatic bobbin thread feeder is placed in a standby state for starting operation. Then, in step 6, it is determined whether or not there is a bobbin replacement request. The bobbin replacement request is automatically generated by the automatic bobbin thread feeder when, for example, the bobbin remaining yarn in the shuttle becomes small, or when the operator turns on the replacement request switch.

Then, if there is a bobbin replacement request by any of these, the process proceeds to step 7, and in step 7,
In order to avoid interference with the sewing machine 300, the sewing machine operation is prohibited and the process proceeds to step 8 where the bobbin is replaced. At this time, one bobbin case 2Y (bobbin winding, thread hook,
(Thread that has completed thread trimming) is moved to the origin position by the operation of step 4 or step 13 described later, that is, the hook 1
Is in the retracted position opposite to (see FIG. 6). For convenience of description, this bobbin case is 2Y and the bobbin case in the shuttle is 2X.

Then, the rotating arm 70 is rotated by 180 ° so that the bobbin case gripping means not gripping the bobbin case faces the shuttle 1 and is then moved forward so that the bobbin case gripping means removes residual thread in the shuttle. The bobbin case 2X with a built-in bobbin is held by the bobbin case holding means.

Then, the rotating arm 70 is retracted thereafter. Next, the rotating arm 70 is rotated by 180 ° so that the bobbin case 2Y faces the hook 1, and then the bobbin case 2Y is moved forward to mount the bobbin case 2Y in the hook, and then the rotating arm 70 is retracted to the retracted position.

Next, in step 9, in step 9, the operation of the sewing machine 300 is permitted, and the process proceeds to step 9a. In step 9a, it is determined whether or not to skip the residual thread removing process. This determination, as described above,
This is performed depending on whether or not the residual thread removal skip mode selection switch 319 is turned on.

Then, if the residual thread removal skip mode selection switch 319 is not turned on, the process proceeds to step 10, and in step 10, the residual thread removal processing is performed. This residual thread removal processing will be described according to the residual thread removal processing routine shown in FIG.

First, in step 1, the rotating arm 7
As shown in FIG. 18A, 0 is slightly advanced to position the bobbin case 2X at the first position B1. At this time, the rotary arm 85 is at the position shown in FIG. 8A, that is, at the position where the drive roller 760 and the driven roller 761 are in contact with each other.

Next, in step 2, in step 2, air for dropping the bobbin thread from the air nozzle 100 is intermittently sprayed for a predetermined period as shown in FIGS. 8 (a) and 18 (c). 18b, the bobbin case 2X is surely hung down the bobbin thread from the bobbin case lead-out portion (near the bobbin thread tension spring hole 2E) and proceeds to step 3. 8), the bobbin case 2X is positioned at the second position B2 shown in FIG. 8B.

Next, in step 4, in step 4, the residual yarn winding motor 86 is driven in the CCW direction in FIG. 8 to rotate the drive roller 760 in the same direction as shown in FIG. 18 (d). At the same time, the rotation driving force is reversed by the rotation arm driving gear 88, and the reversed rotation driving force is frictionally transmitted to the rotation arm 85 through the storage portion 250a, the clutch pressure contact spring 250c, and the friction clutch plate 250b. , The rotation arm 85 is rotated 90 ° in the CW direction about the shaft 87 as a fulcrum, and the driven roller 761 is separated from the drive roller 760 to separate the rollers 760, 76.
A space is provided between the two (see FIG. 8B).

Next, in step 5, in step 5, air for blowing the lower thread is blown from the air nozzle 100 (see FIGS. 8B and 18C), and the lower thread hanging from the bobbin case 2X is blown. Blow the end M to the working position.

Next, in step 6, in step 6, the residual thread winding motor 86 is driven in the CW direction in FIG. 8 to move the drive roller 760 in the same direction (lower thread) as shown in FIG. 18 (d). In the discharge rotation direction P; see FIG. 8C), the rotation driving force is applied to the rotation arm drive gear 8
The rotation direction is reversed by 8 and the reversed rotation driving force is frictionally transmitted to the rotating arm 85 through the storage portion 250a, the clutch pressure contact spring 250c, and the friction clutch plate 250b, and the rotating arm 85 is used as a fulcrum for CCW. The driven roller 761 is turned toward the drive roller 760 side. Then, the rotating arm 85 moves from 90 ° to 45 °.
When closed, the drive of the residual thread winding motor 86 is stopped (see FIG. 8C).

Next, in Step 7, in Step 7, the driving of the residual thread winding motor 86 is restarted as shown in FIG. 18 (d), and the rotary arm 85 is closed by 30 ° from the above angle. At the same time, the drive of the residual yarn winding motor 86 is stopped (see FIG. 8D).

Next, in step 8, the blowing of the lower yarn blowing air by the air nozzle 100 is stopped in step 8 (see FIG. 18C).
That is, before the lower thread end portion M is clamped between the rollers 760 and 761, the air blowing by the air nozzle 100 is stopped.

Next, in Step 9, in Step 9, the driving of the residual thread winding motor 86 is restarted as shown in FIG. 18 (d), and the rotary arm 85 is closed by 15 ° from the above angle. At the same time, the drive of the residual thread winding motor 86 is stopped (see FIG. 8 (e)). At this time, the driven roller 761 contacts the driving roller 760,
The lower thread end portion M is clamped between 0 and 761.

By intermittently closing the driven roller 761 as described above, the turbulence of the air flow from the air nozzle 100 that blows the lower thread end portion M to the working position is greatly reduced, and the lower thread is rotated by the rollers 760 and 761. You will not run away from the gap.

When the amount of movement of each of the driven rollers 761 for each intermittent movement is reduced from a large value to a small value, the turbulence of the air flow is further reduced, and the lower thread is prevented from escaping between the rollers 760 and 761.

Here, when air is blown by the air nozzle 100 when the bobbin thread end portion M is sandwiched between the rollers 760 and 761, the air passing between the rollers 760 and 761 and escaping to the downstream side is generated. 760 and 761 cut off the bobbin thread end portion M to escape from between the rollers 760 and 761 to prevent the rollers 760 and 761 from entraining and discharging, but like the present embodiment, the lower end was blown to the working position by the air nozzle 100. The lower thread end portion M is connected to the roller 761.
When the air of the air nozzle 100 is shut off before being sandwiched between the rollers 760 and 761 by the movement of the above, the bobbin thread end portion M that has been blown up hangs down on the outer peripheral surface of the rotating driven roller 761. And the driven roller 7
When 61 rotates to face the roller 760 and come into contact with the roller 760, the lower thread end portion M is sandwiched between the rollers 760 and 761.

Then, the process proceeds to step 10 and step 1
At 0, the air nozzles 100 and 10 are arranged so that the lower thread discharged by the rotation of the rollers 760 and 761 does not get entangled with the rollers 760 and 761 and the members in the vicinity thereof.
The air blowing for preventing the yarn entanglement is started from 0a (see FIG. 8 (e) and FIG. 18 (c)).

Then, the process proceeds to step 11, step 1
1, the residual yarn winding motor 86 is intermittently driven to move the drive roller 760 to 1/1 as shown in FIG. 18 (d).
Rotate 0 times, 10 times each. Here, when the residual yarn winding motor 86 is driven, the driven roller 761 is driven by the drive roller 7.
60, the rotation arm 85 cannot rotate in the CCW direction around the shaft 87 as a fulcrum, and slippage occurs between the friction clutch plate 250b and the side plate 85b on the back side of the rotation arm 85. Then, a state in which no further pressing force is applied (a state in which the pressing force is maintained) is achieved, and the drive roller 760 continues to rotate in the CW direction as it is. Therefore,
The lower thread nipped between the rollers 760 and 761 is
By the intermittent co-rotation of 60 and 761, the rollers 760 and 7
While being caught in 61, it is gradually discharged downstream.

Then, the process proceeds to step 12, step 1
2, the driving roller 760 is rotated 10
It is determined whether or not it has rotated once (whether the drive roller 760 has made one rotation). If it has not rotated 10 times, the same determination is repeated until it has rotated 10 times. Proceeding to step 13, in step 13, the residual thread winding motor 86 is driven to rotate the drive roller 760 1/2 as shown in FIG. 18 (d).

Then, the process proceeds to step 14, step 1
4, the residual yarn winding motor 86 is driven to rotate the drive roller 760 once, as shown in FIG. 18 (d).

At the beginning of winding and discharging the bobbin thread as described above, as in steps 11 to 14, the roller 76
When 0, 761 is rotated intermittently, the yarn irregularity is reduced and the bobbin thread can be reliably wound, and the bobbin thread can be discharged in a predetermined direction, and there is no fear that the rollers 760, 761 or other members are entangled. Will be reduced.

At this time, the air nozzles 100, 100
Air is blown onto the rollers 760 and 761 by a (actually, the bobbin case 2X is the second
Since the bobbin case 2 is located at the position B2 of
Most of the air does not hit the driven roller 761 due to X as an obstacle, but a part of the flow is directed to the driven roller 761), and even if the lower thread is entangled with the rollers 760, 761 and other members. Even if the roller 7 is rotating intermittently
At the time of stopping 60, 761, the entanglement of the lower thread is favorably released by the air.

Further, when the amount of the bobbin thread discharged by the intermittent rotation is first gradually and gradually increased for each intermittent operation, the discharged bobbin thread gradually becomes heavier and the posture of the discharged bobbin thread becomes stable. However, the fear of being entangled with the rollers 760 and 761 and other members is reduced.

Now, returning to the flowchart shown in FIG. 16 again, in step 15, it is judged whether or not the residual yarn of the bobbin 7 is removed. This is roller 76
Due to the co-rotation of 0.76
The bobbin 7 rotates if it is caught in 1 and discharged downstream (remaining yarn is removed), and if it is not discharged (remaining yarn is not removed), the bobbin 7 does not rotate. Therefore, it is judged. The presence / absence of this rotation is determined by the output signal from the reflective optical sensor 500 described above.

When it is determined that the bobbin 7 is not rotating, that is, the residual thread is not removed, the process proceeds to step 41, and in step 41, it is determined whether the retry operation has been performed a prescribed number of times. . Here, in the present embodiment, the prescribed number of times is three, and if it is less than three, the process proceeds to step 42, in which the pivot arm 70 is pivoted to move the bobbin case 2X to the dummy shaft. 6 is made to oppose, and it is made to retreat to a retracted position after that. That is, the position of the bobbin case 2X is returned to the position before step 1. Then, the process returns to step 1.

On the other hand, when the retry operation is performed three times in step 41, the process proceeds to step 43, and in step 43, the blowing of the air for preventing the yarn entanglement from the air nozzles 100 and 100a is stopped and the process proceeds to step 44. The process proceeds to step 44, at which it is determined that some failure that cannot remove the residual yarn occurs, an error flag is set, and the process returns.

When it is determined in step 15 that the bobbin 7 is rotating, that is, the residual yarn is removed, the process proceeds to step 16, and in step 16, the rotating arm 70 is moved to the position shown in FIG. As shown in FIG. 8B, the bobbin case 2X is rotated to position it at the residual yarn removing position B (see FIG. 8F). In this way, when the bobbin case 2X moves from the second position B2 to the residual thread removing position B, the bobbin case 2X that has become an obstacle is removed as shown in FIG.
Air for preventing thread entanglement from 0 directly follows the driven roller 76.
Blown on 1.

Then, the process proceeds to step 17, step 1
In FIG. 7, the residual thread winding motor 86 is driven at a low speed as shown in FIG. 18 (d) and the process proceeds to step 18. In step 18, it is determined whether or not the bobbin 7 has been driven by one revolution. If not driven for one rotation, the same judgment is repeated until it is driven for one rotation, and if it is driven for one rotation, the process proceeds to step 19. At step 19, the residual thread winding motor 86 is set to the position shown in FIG. As shown in
After driving at medium speed, the process proceeds to step 20, and in step 20, it is determined whether or not the bobbin 7 has been driven by one rotation. If not driven by one rotation, the same determination is repeated until it is driven by one rotation. When driven by one rotation, the process proceeds to step 21, and in step 21, the residual yarn winding motor 8
6 is driven at high speed, as shown in FIG.

As described above, when the rotational speed is controlled stepwise such that the rotational speed is initially low and then becomes high, the yarn outburst can be prevented as compared with the high-speed one in which the rotational speed is constant.
The fear of being entangled with 61 or other members is reduced. Further, the discharge time can be shortened as compared with a low rotation speed with a constant rotation speed.

Then, the process proceeds to step 22 and step 2
In step 2, it is determined whether or not the bobbin 7 has stopped. If it is determined that the bobbin 7 has not stopped and the residual thread removal is still continuing, the same determination is made until the bobbin 7 stops. Repeatedly, on the other hand, the bobbin 7 stopped and the residual thread removal was completed (accurately, the above-mentioned lump-shaped mass was formed and sandwiched in the gap between the lower thread tension spring 2D and the outer peripheral surface of the bobbin case to stop the bobbin rotation. Including the case where the residual thread is being removed.
If it is determined that the details will be described later), the process proceeds to step 23, and in step 23, the air nozzles 100 and 1
The blowing of air for preventing the yarn entanglement from 00a is stopped, and the process proceeds to step 24. At step 24, the residual yarn winding motor 86 is stopped, the rotation of the drive roller 760 is stopped, and the process proceeds to step 25.

In step 25, whether the bobbin rotation has stopped is due to the fact that the lower thread to be pulled out has a lump-shaped mass, and the thread type and thread number input by the thread number and thread number input switch 309 are used. It judges based on.

[0118] Here, the lump-shaped lumps are generally liable to be formed particularly in thick-count yarns such as # 8, # 20, and # 30, and particularly in the case of yarn types such as polyester spun yarn. . Further, it is difficult to form a bump-like mass in a thread type such as filament thread.

That is, in this embodiment, the yarn type is polyester spun yarn, and the yarn counts are # 8, # 20,
When the stop of the bobbin rotation is detected in step 22 at the time of # 30, it is determined that there is a possibility that the bobbin rotation is stopped because the bump-shaped lump is caught in the gap.

Therefore, in step 25, when the yarn type does not satisfy both the polyester spun yarn and the yarn count of # 8, # 20, and # 30, the bobbin rotation detected in step 22 is stopped. Since it has been completely removed, the flow returns to the flow shown in FIG.

On the other hand, in step 25, if the yarn type satisfies both the polyester spun yarn and the yarn counts of # 8, # 20, and # 30, in step 22, a bump-shaped lump is caught in the gap. Therefore, the bobbin rotation may be stopped, and the process proceeds to step 26.

In step 26, as shown in FIG. 8 (g), the rotating arm 70 is rotated to move the bobbin case 2X to the lower thread tension spring gap expanding position B3 further above the residual thread removing position B. Let Then, the lower thread drawn out from the vicinity of the lower thread tension spring hole 2E of the bobbin case 2X is as shown in FIG.
In the state shown in (f), it is stretched from the vicinity of the bobbin thread tension spring hole 2E approximately in the tangential direction of the bobbin case. As shown in FIG. 5, the wire is stretched downward in the figure with a predetermined angle with respect to the tangential direction.

That is, the bobbin case 2X is stretched at a predetermined angle downward in the drawing with respect to the tangential direction, so that the lower thread tension spring 2D has a screw (not shown) for varying the tension of the lower thread tension spring 2D. A known one) is used as a fulcrum to be floated, and the gap between the lower thread tension spring 2D and the outer peripheral surface of the bobbin case is enlarged.

Here, in order to properly widen this gap and prevent the yarn to be pulled out from being cut, the above-mentioned predetermined angle is set to
6 with respect to the tangential direction with the bobbin thread tension spring hole 2E as a fulcrum
The angle is preferably in the range of 0 ° to 110 °. Particularly preferably, it is in the range of 80 ° to 90 °.

Then, the process proceeds to step 27, and at step 27, the rollers 760,
The lower thread discharged by the rotation of 761 is the roller 760,
761 starts blowing air from the air nozzles 100 and 100a for preventing yarn entanglement so as not to get entangled with the members around it, and proceeds to step 28. At step 28, as in step 11, the residual yarn winding motor is used. 86 is intermittently driven to rotate the drive roller 760 10 times by 1/10 rotation, and the process proceeds to Step 29, where Step 2
In step 9, as in step 12, it is determined whether the drive roller 760 has rotated 10 times in 1/10 rotations.
If it has not been rotated, the same determination is repeated until it has rotated 10 times, and if it has rotated 10 times, the routine proceeds to step 30.

Thus, when the yarn is pulled out with the gap between the bobbin thread tension spring 2D and the outer peripheral surface of the bobbin case enlarged, the lump-shaped mass that has been caught in the gap before the bobbin thread tension spring 2D is floated. Passes through this widened gap and moves from below the lower thread tension spring 2D. That is, it is possible to continue removing the residual yarn.

Then, in step 30, in step 30, the rotating arm 70 is rotated to move the bobbin case 2X from the lower thread tension spring gap expanding position B3 to the residual thread removing position B (FIG. 8 (f)). )reference).

Then, the process proceeds to step 31 and step 3
1, the residual thread winding motor 86
Is driven to rotate the drive roller 760 1/2 turn and the process proceeds to step 32. In step 32, the residual yarn winding motor 86 is driven to drive the drive roller 76 in the same manner as in step 14.
0 is rotated once to proceed to step 33. At step 33, the residual yarn winding motor 86 is driven at a low speed similarly to step 17, and the procedure proceeds to step 34. At step 34, the bobbin 7 is rotated once for one rotation as at step 18. It is determined whether or not it has been driven. If it has not been driven for one rotation, the same determination is repeated until it has been driven for one rotation, and if it has been driven for one rotation, the process proceeds to step 35, and at step 35, step 19 Similarly, the residual thread winding motor 86 is driven at a medium speed, and the process proceeds to step 36. At step 36, it is determined whether or not the bobbin 7 has been driven by one rotation like step 20, and it is not driven by one rotation. In this case, the same determination is repeated until the driving is performed for one rotation, and when the driving is performed for one rotation, the process proceeds to step 37, and in step 37, similar to step 21. The yarn winding motor 86 is driven at high speed to proceed to step 38. In step 38, it is determined whether or not the bobbin 7 is stopped, as in step 22, and the bobbin 7 is not stopped and the remaining yarn removal is still continued. If it is determined that the bobbin 7 is stopped, the same determination is repeated, and if it is determined that the bobbin 7 is stopped and the residual yarn removal is completed, the process proceeds to step 39, and in step 39, step 23 Similarly to the air nozzles 100 and 1
The blowing of air for preventing the yarn entanglement from 00a is stopped and the process proceeds to step 40. In step 40, the residual yarn winding motor 86 is stopped and the rotation of the drive roller 760 is stopped in the same manner as in step 24, and the flow of FIG. Return to.

When the residual yarn is removed in this way,
Proceed to step 11 of the flowchart shown in FIG.
In step 11, it is determined whether or not the error flag is set. If the error flag is set, the process proceeds to step 18, the error flag is cleared in step 18, the process proceeds to step 19, and the step 19 , An error is displayed and the process proceeds to step 20. In step 20, it is determined whether the sewing machine power switch 302 is off. If it is on, the same determination is repeated until it is turned off. When the sewing machine power switch 302 is turned off, the process proceeds to step 17, and in step 17, the relay switch 303 is turned off to cut off the power of the automatic bobbin thread feeder.

On the other hand, if the error flag is not set in step 11, the process proceeds to step 12.
Also, when the residual thread removal skip mode selection switch 319 is turned on in step 9a, the step 1
0, skip step 11, go to step 12,
In step 12, bobbin winding (thread winding), thread hooking,
Perform thread trimming process.

Then, the process proceeds to step 13, and in step 13, the rotating arm 70 is retracted to the retracted position, and then rotated to make the bobbin case 2X face the shuttle 1 to be in the standby state.

Then, the process proceeds to step 14, step 1
At 4, it is determined whether the sewing machine power switch 302 is off. Therefore, even if the sewing machine power switch 302 is turned off during the processing operation of each apparatus in steps 8 to 12, the series of processing operations in steps 8 to 12 are all performed to enter the bobbin replacement standby state. .

Then, in step 6 above, if there is no bobbin exchange request, the process proceeds to step 14 and step 1
If it is determined that the sewing machine power switch 302 is ON in step 4, the process returns to step 6. That is, when the sewing machine power switch 302 is turned on, the bobbin case 2X held by the bobbin case holding means is in the original position and waits for a bobbin replacement request. If it is determined to be off, that is, if the sewing machine power switch 302 is turned off by the operator, the process proceeds to step 15.

Next, in step 15, the rotating arm 70 is moved forward by a predetermined number of steps to move the bobbin case 2X to the position where the bobbin case 2X approaches and approaches the shuttle 1 as shown in FIG. As a result, the bobbin case 2X and the bobbin case 2Y in the shuttle cannot be taken out unless the rotary arm 70 is forcibly rotated or retracted manually. Incidentally, in the present embodiment, since there is an obstacle around the bobbin case holding means at this position, the rotation of the rotating arm 70 is restricted, and the rotation is not possible.

Then, the process proceeds to step 16, step 1
6, the current state is RAM (non-volatile memory)
In addition to being stored in the RAM 308, the fact that the normal power-off processing has been performed is also stored in the RAM 308. Then, in step 17, in step 17, the relay switch 303 is turned off to cut off the power source of the automatic bobbin thread feeder.

After that, when the sewing machine power switch 302 is turned on again, the process returns to step 1 shown in FIG. 15, and first, the information at the time of the previous power shutdown and information as to whether or not the normal power shutdown process has been performed are displayed. It is read from the RAM 308.

Then proceed to step 2 where the initialization operation is performed in the most efficient manner.
Then, when this initialization operation is completed, the process proceeds to step 3, and in step 3, it is judged whether or not the previous normal power-off process was performed, and if it is the normal power-off process, that is, the operator turns on the sewing machine power supply. If the switch 302 is turned off, the process proceeds to step 4. If not, for example, if the power is not shut down normally due to an unexpected power failure, the display means 316 such as an error display window and a warning buzzer is displayed. An error message is displayed by the operator, and the intervention of the operator is prompted to proceed to step 21.

In step 4, the rotary arm 70 is retracted by a predetermined number of steps to detect the origin, and it is determined whether or not the origin is detected by the same number of steps (step 15) as described above. Here, when the operator takes out the bobbin case 2X and the bobbin case 2Y in the shuttle while the sewing machine power switch 302 is off, the position of the rotating arm 70 moves from the position where the rotary arm 70 approaches and approaches the shuttle 1. Therefore, the origin is not detected with the same number of steps as above. on the other hand,
If the operator has not taken out the bobbin case 2X and the bobbin case 2Y in the shuttle, the rotary arm 70 is located at a position facing the shuttle 1 so that the rotary arm 70 has the same number of steps as above. Return to the home position.
When the origin is not detected in the same number of steps, that is, when the bobbin case 2X and the bobbin case 2Y in the hook are taken out, an error display is made by the display means 316 such as an error display window and a warning buzzer, and the operator Is prompted to proceed to step 21.

At step 21, the operator's intervention is awaited, and the bobbin check, residual thread removal processing and resetting are performed by the operator, and the procedure proceeds to step 22. At step 22, the same bobbin thread winding processing and thread The hooking process and the thread trimming process are performed, and the process proceeds to step 23. In step 23, the bobbin case containing the bobbin that has been subjected to each process in step 22 is attached to the shuttle 1 and the process proceeds to step 12 described above.
The lower thread winding process, the yarn hooking process, and the thread trimming process for the other bobbin case are performed. Then, the subsequent operations are similarly performed.

When the bobbin case holding means first holds the bobbin case accommodating the bobbin, similarly to the case where the bobbin case is attached to the inner hook shaft 5 by inserting a hand from the rotating arm side. The bobbin case is pushed into the dummy shaft 6 without returning the palm, the bobbin case is mounted on the dummy shaft 6, the bobbin case holding means is opposed to the dummy shaft 6, and then the bobbin case is moved forward to be held by the dummy shaft 6. The bobbin case holding means may hold the case.

When the bobbin and bobbin case being used are to be replaced, the bobbin case holding means holding the bobbin case can be moved to the bobbin case holding means by advancing the bobbin case holding means facing the dummy shaft 6. The held bobbin case 2 can be transferred to the dummy shaft 6. When the bobbin case 2 held by the dummy shaft 6 is taken out, if the hand is inserted from the rotary arm side, the dummy shaft is not returned, just like the bobbin case 2 is taken out from the inner hook shaft 5. The bobbin case held by 6 can be taken out.

As described above, the residual yarn removing device 1 of the present embodiment
In No. 61, when the bobbin rotation is stopped due to a bump-like mass being caught in the gap between the lower thread tension spring 2D and the outer peripheral surface of the bobbin case during removal of the residual thread, bobbin replacement as lower thread tension spring gap expanding means. The bobbin thread tension spring 2 by the device 160
Float D with respect to the outer peripheral surface of the bobbin case to widen the gap, and at this time, rollers 760 and 761 as pulling means.
The thread pulling-out operation is performed by means of this configuration so that the lump-shaped mass sandwiched in the gap is passed through the widened gap and moved from below the lower thread tension spring 2D to continue the thread pulling-out operation. Therefore, it is possible to satisfactorily complete the removal of the residual thread, and this causes a problem in the subsequent process, such as newly winding the residual thread remaining in the bobbin case or the residual thread derived from the bobbin case. It is possible to prevent the occurrence of a problem in which the bobbin thread to be wound is entangled and the bobbin thread cannot be wound properly, and it is possible to improve the quality and reliability of the device.

Further, a bobbin changing device 160 in which a mechanism for floating the lower thread tension spring 2D is adopted in an automatic lower thread feeder.
Since it is configured so that no separate mechanism is required,
The effects described above can be realized at low cost.

Further, based on the yarn count and the yarn type, the yarn may have a bump-shaped mass (in the present embodiment, the yarn type is polyester spun yarn and the yarn count is # 8,
Steps 26 to 40 shown in FIG. 17 are executed only for the case of # 20 and # 30), and for threads that do not need to be executed (threads other than the above conditions; for example, fine count threads or filament threads) On the other hand, the above steps are omitted, and the bobbin exchanging device 160 causes the lower thread tension spring
When the bobbin case 2X is moved so as to float, that is, when the bobbin thread tension spring 2D is pulled out while pressing the thread that does not need to be executed, the occurrence of thread breakage caused by this operation may occur. Since it is configured so as to prevent, the cycle time of the device can be shortened, and the quality and reliability of the device can be improved.

Furthermore, the present embodiment also has the following effects. That is, for example, when performing ground stitching or the like that allows stitching, that is, when residual thread removal is not required due to sewing that uses up all the bobbin thread wound on the bobbin, the residual thread removal skip mode selection switch 319 is set. When the switch is turned on, the residual thread removing process is skipped and the next predetermined continuous process is performed, so that the cycle time of the apparatus can be shortened. If the bobbin having no residual thread is removed, the determination in step 15 of FIG. 16 is always NO and the error flag is set. Although not an error, an error occurs in step 19 of FIG. Although the display is displayed and the intervention of the operator is prompted, in the present embodiment, since the above-mentioned residual yarn removal skip mode selection switch 319 is provided, such a problem does not occur. It is like this.

Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say, for example, the residual yarn removing device 161 of the above-described embodiment is disclosed in
It is also possible to replace with the residual thread removing device described in Japanese Patent No. 68071, and the point is that the residual thread removing device is wound around the bobbin 7 and passes through the lower thread guiding hole 2H of the bobbin case 2 and then the lower thread tension spring 2 is inserted.
The bobbin thread drawn from a predetermined position below D (near the bobbin thread tension spring hole 2E) is pulled out from the predetermined position by a thread drawing operation of a drawing means such as a rotating body or air, and the bobbin 7 is rotated. Any structure may be used as long as it removes the residual yarn wound around the bobbin 7.

In the above embodiment, the lower thread tension spring 2D is floated when the lower thread of the polyester spun thread is # 8, # 20 or # 30. It is not limited to the seed and the yarn count.
Further, although the bobbin thread tension spring 2D is floated based on the thread count and the thread type as described above, the bobbin thread tension spring 2D may be floated based on at least one of the thread count and the thread type. good.

In the above embodiment, the bobbin case 2 is moved according to the bobbin exchanging device 160 to float the bobbin thread tension spring 2D. However, the bobbin case 2 is fixed and the drawing means (roller 76) is used.
0,761) to move the bobbin thread tension spring 2D
The bobbin thread tension spring 2D may be floated by moving both the bobbin case 2 and the drawing means (rollers 760, 761).
In addition, the bobbin case 2 and the drawing means (roller 76
(0, 761) are both fixed and an actuator such as an air cylinder as a bobbin thread tension spring gap expanding means is provided in the vicinity of the residual thread removing position B, and the bobbin thread tension spring 2D is pressed in the opening direction according to the drive of this actuator. By doing so, the lower thread tension spring 2D may be floated.

Further, in the above-described embodiment, when the driving roller 760 is rotated while the lower thread tension spring 2D is floated, when the bump-shaped mass passes through the widened gap,
Although the bobbin thread tension spring 2D is returned to the original position to continue the residual thread removal process, the residual thread removal process may be continued with the bobbin thread tension spring 2D floating.

Further, in the above embodiment, it is determined in step 22 shown in FIG. 16 whether or not the bobbin 7 is stopped, the bobbin 7 is stopped, and the yarn type used is a polyester spun yarn and a yarn. When the numbers are # 8, # 20, and # 30, the rotating arm 70 is rotated to move the bobbin case 2 to the lower thread tension spring gap expanding position B3 which is higher than the residual thread removing position B. However, instead of this, the yarn type is polyester spun yarn and the yarn count is # 8, # 20, #
At 30, the rotation arm 70 is rotated to move the bobbin case 2 to the bobbin thread tension spring gap expansion position B3 from the first remaining thread removing operation without determining the stop of the bobbin 7 to remove the remaining thread. You may make it operate | move. The yarn type is polyester spun yarn and the yarn counts are # 8, # 20, # 30.
At the time of, for example, every time the residual thread is pulled out by 50 mm, the bobbin case 2 is moved from the residual thread removing position B to the lower thread tension spring gap expanding position B3, and the residual thread removing operation is performed with the thread length of 5 mm. 2 for bobbin thread tension spring gap expansion position B
It is also possible to move from 3 to the residual thread removing position B and perform the residual thread removing operation.

[0151]

As described above, according to the residual thread removing device of the first aspect, the bobbin thread tension spring gap expanding means floats the bobbin thread tension spring with respect to the outer peripheral surface of the bobbin case to form the bobbin thread tension spring. The gap between the bobbin case and the outer peripheral surface is widened, and at this time, the yarn pulling-out operation is performed by the pulling-out means to pass the lump-shaped mass that is or may be caught in the gap to the widened gap. Since it is configured so that it can be moved from under the bobbin thread tension spring to continue the thread withdrawing operation, residual thread removal can be successfully accomplished, and this can prevent the occurrence of defects in the subsequent process and improve the device quality. It is also possible to improve reliability.

At this time, various means can be adopted as the lower thread tension spring gap expanding means, but as described in claim 2,
For example, it is possible to employ moving means for moving at least one of the bobbin case and the drawing means relative to the other so that the lower thread tension spring floats. In addition, this transportation means
If the bobbin exchanging device in which the bobbin case used in the automatic bobbin thread feeder is movable, it is not necessary to additionally provide a bobbin thread tension spring gap expanding means, and the effect of claim 1 can be realized at low cost. It will be possible.

According to the residual yarn removing device of claim 3,
In addition to claim 1, based on at least one of the yarn count and the yarn type, the operation of the bobbin thread tension spring gap expanding device is performed only for the yarn that may have a lump-like mass in the yarn by the determination device. This operation is omitted for yarns for which the operation of the gap expanding means is not necessary, and the bobbin thread tension spring is floated by the movement of the moving means, for example, as described in claim 2. When the lower thread tension spring pulls out the lower thread that does not require the operation of the gap expanding means while pressing it, it is configured to prevent the occurrence of thread breakage caused by this operation. Therefore, in addition to the effect of claim 1, the cycle time of the device can be shortened, and the device quality and reliability can be improved.

[Brief description of drawings]

FIG. 1 is a schematic front view showing an automatic bobbin thread feeder according to an embodiment of the present invention.

FIG. 2 is a front view of a bobbin changing device adopted in the same upper and lower yarn automatic feeding device.

FIG. 3 is a plan view of the above bobbin changing device.

FIG. 4 is a right side view showing a direct-acting mechanism portion of the above bobbin changing device.

FIG. 5 is a right side view showing a rotation mechanism portion of the above bobbin changing device.

FIG. 6 is a schematic right side view for explaining dummy positions and dummy shafts of the bobbin changing device of the above.

FIG. 7 is a right side view of a residual yarn removing device adopted in the same upper and lower yarn automatic feeding device.

FIG. 8 is a view for explaining the operation of the above residual thread removing device;
FIG. 3 is a front explanatory view showing only main parts of the residual thread removing device of FIG.

FIG. 9 is a front view of the bobbin used in the present embodiment on the side of rotation detection means.

FIG. 10 is a waveform diagram detected when the bobbin rotates.

FIG. 11 is an explanatory diagram showing a lower thread withdrawing direction with respect to a bobbin case when a thread-like lump is formed on the thread and the residual thread cannot be removed.

FIG. 12 is a perspective view of a bobbin case adopted in the embodiment.

FIG. 13 is a block diagram showing the overall configuration of the device in the above embodiment.

FIG. 14 is a block diagram showing a control system in the same embodiment.

FIG. 15 is a flowchart showing a flow of control operation procedure of the same upper and lower yarn feeders.

FIG. 16 is a flowchart showing a flow of a control operation procedure of the above residual yarn removing device.

FIG. 17 is a flowchart following FIG. 16.

FIG. 18 is a timing chart for explaining the operation of the above residual thread removing device.

FIG. 19 is a right side view showing only the essential parts of the bobbin changing device when the power to each device is cut off.

[Explanation of symbols]

2, 2X, 2Y bobbin case 2D bobbin thread tension spring 2E bobbin thread tension spring hole 2H bobbin thread lead-out hole 7 bobbin 160 bobbin thread tension spring gap expanding means (moving means; bobbin replacing device) 161 residual thread removing device 315 energization timing Control means (judgment means) 319 Thread count / thread type input switch 403 Residual thread removal device control means 450 Power supply energization control means 760, 761 Draw-out means B3 Lower thread tension spring gap expansion position

Claims (3)

[Claims] 1. A bobbin accommodated in a bobbin case and rotatably supported, and a pulling-out means for pulling out a bobbin thread wound from the bobbin case and drawn out from a predetermined position under the bobbin thread tension spring through a bobbin thread bobbin case hole. A residual thread removing device configured to rotate the bobbin by a thread drawing operation of the drawing means to draw out and remove a lower thread of the bobbin, wherein the lower thread tension spring is floated to remove the lower thread. A bobbin thread tension spring gap expanding means for widening a gap between the tension spring and the outer peripheral surface of the bobbin case is provided, and the bobbin thread tension spring gap expanding means expands the gap while allowing the yarn drawing operation of the drawing means. The residual yarn removing device characterized in that 2. The residual thread removing device according to claim 1, wherein the lower thread tension spring gap expanding means moves at least one of the bobbin case and the drawing means relative to the other so that the lower thread tension spring floats. A residual yarn removing device, which is a moving means for moving the residual yarn. 3. The residual thread removing device according to claim 1, further comprising a determining means for determining whether or not the lower thread tension spring gap expanding means operates based on at least one of a yarn count and a yarn type. apparatus.