JPH08309069A - Remaining thread removing device for bobbin - Google Patents

Abstract

PURPOSE: To minimize the number of driving means required for a remaining thread removing operation, to lower a cost and to improve the degree of the freedom of design by generating a free space. CONSTITUTION: A rotating body 760 is rotated in a direction opposite to a bobbin thread discharging direction by the driving means 86, driving force is transmitted from the driving means 86 to a rotary arm 85 by a transmission/interruption means 211, the rotary arm 85 is rotated in an opening direction with a shaft 87 as a supporting point, the space for introducing bobbin thread is secured between both rotating bodies and the bobbin thread is made to go into the space. In the meantime, the rotating body 760 is rotated in the bobbin thread discharging direction by the driving means 86 and the driving force is interrupted from the driving means 86 to the rotary arm 85 by the transmission/interruption means 211. At the time, the rotary arm 85 is rotated in a closing direction with the shaft 87 as a center by an energizing means 210, the other rotating body 761 is pressurized to the rotating body 760, the bobbin thread is held there between both rotating bodies, the remaining thread of a bobbin is dragged in and discharged by the cooperation of both rotating bodies and the driving means is used in common for the rotating body 760 and for the rotary arm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bobbin residual thread 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 that performs high-speed sewing work, it is necessary to frequently replace a bobbin wound with a lower thread. is there. 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 around the bobbin. Is manually carrying out a series of operations for accommodating the newly wound bobbin in the bobbin case and mounting the bobbin case in the shuttle.

However, the manual removal work of the residual yarn, the winding work of the bobbin around the bobbin, and the replacement work of the bobbin case are extremely inefficient and cause a decrease in productivity. Therefore, the present applicant is trying to solve the above problems in the lower thread automatic feeder described in Japanese Patent Application Laid-Open No. 7-68071.

The outline structure of the automatic bobbin thread supplying device disclosed in Japanese Patent Laid-Open No. 7-68071 is a bobbin case for accommodating a bobbin around which a bobbin thread is wound and mounted in a hook of a sewing machine, and this bobbin case. A bobbin case gripping means capable of gripping or releasing the case and a bobbin exchanging device comprising a rotating arm capable of rotating the bobbin case gripping means about one axis as a fulcrum and moving in the axial direction, and separated from the hook in the axial direction. And a bobbin winding device that winds the bobbin around the bobbin and a residual yarn removing device that removes the residual yarn of the bobbin.

The residual yarn removing device described in the above publication is composed of a yarn removing shaft and a plurality of elastic linear members which have one end fixed to the yarn removing shaft and are arranged around the yarn removing shaft and project in the axial direction. Means, a receiving shaft facing the winding means and advancing, and expanding the elastic linear body outward with the fixed end as a fulcrum and rotating together with the winding means, and these receiving shafts. And an air nozzle, which is disposed further to the side opposite to the bobbin case than the winding means, blows a bobbin case that accommodates the bobbin inside to blow a bobbin end to a working position, and a bobbin end blown to this working position. A guide member that guides so that it can be sandwiched between the receiving shaft and the winding means,
Between the winding means arranged around the winding means and retracted,
It is provided with a residual yarn removing device consisting of a handle plate capable of removing the residual yarn wound around the winding means, and a predetermined length (about 35 to 40) which is drawn out from the bobbin case and droops downward.
mm) of the lower thread end is blown to the working position by the air nozzle, and the lower thread end blown to this working position is guided by the guide member and clamped between the receiving shaft and the yarn removing shaft. , The remaining yarn wound on the bobbin is wound around the elastic linear body by rotating the winding means for a predetermined period of time, and then the winding means is retracted to move the elastic linear body from the receiving shaft. By removing the elastic linear body to its original position, loosening is caused between the elastic linear body and the wound residual thread, and the wound residual thread is removed by the handle plate. By handling, the residual yarn is dropped and removed.

In the automatic bobbin thread feeder, the bobbin case gripping means is moved to the bobbin and the residual thread by the pivoting movement about one axis of the pivoting arm and the moving movement parallel to the one axis. It has a structure that can be moved to the residual thread removing position of the removing device and the bobbin winding position of the bobbin winding device, so that the bobbin winding operation, the residual thread removing operation, and the bobbin case replacement operation are automatically The work is being carried out in order to improve work efficiency and productivity.

[0007]

However, even the device described in Japanese Patent Laid-Open No. 7-68071 has the following problems. That is, in the residual thread removing device, a lower thread end portion of a predetermined length (about 35 to 40 mm) derived from the bobbin case (specifically, under the lower thread tension spring) is provided between the receiving shaft and the thread removing shaft. It is desirable to bring the winding means close to the yarn end lead-out port of the bobbin case in order to increase the probability of the clamping, since the configuration is adopted in which
In this way, when the winding means is brought close to the yarn end outlet of the bobbin case, the residual thread is wound around the winding means. Therefore, there is a problem that the winding amount is limited.

That is, when the winding means is brought close to the yarn end outlet of the bobbin case in order to improve the yarn end clamp ratio, the residual yarn winding amount is limited, and the residual yarn cannot be completely removed. When the winding means is moved away from the yarn end outlet of the bobbin case for removal, there is a conflicting problem that the yarn end clamp ratio is lowered and the residual yarn is not reliably removed.

Further, as described above, the guide member for guiding the lower thread end portion of the predetermined length drawn out from the bobbin case so as to be sandwiched between the receiving shaft and the winding means is the thread end of the bobbin case. Since the yarn end is arranged far from the outlet, the guide of the yarn end is unstable, and there is a fear that the yarn end cannot be held between the receiving shaft and the winding means.

In addition, the residual yarn removing device has a problem that the cost is increased because complicated parts having a structure such as the elastic linear body are used and the number of parts is large.

Therefore, according to the present invention, all the bobbin residual yarns can be surely and automatically removed with a simple structure, and the number of actuators (driving means) required for the residual yarn removing operation is minimized. It is an object of the present invention to provide a residual thread removing device for a bobbin, which is capable of reducing the cost and creating an empty space to improve the degree of freedom in design.

[0012]

In order to achieve the above object, a bobbin residual thread removing device according to a first aspect of the present invention comprises a rotatably supported bobbin and a pair of bobbin that hangs up and discharges a lower thread. A rotatable rotating body, a drive means for rotating one of the pair of rotating bodies so as to rotate in a forward direction or a reverse direction, and a rotation unit that supports the other of the pair of rotating bodies and is rotatable about one axis. The moving arm, the urging means for urging the rotating arm so that the other rotating body is directed toward the one rotating body around the one axis, and the lower thread discharge rotation direction of the one rotating body When rotating in the opposite direction, the driving force by the driving means is transmitted to the rotating arm so that the other rotating body rotates in a direction away from the one rotating body, while the one rotating body is rotated. When the lower thread is rotated in the rotation direction, The driving force by the driving means is rotated so that the other rotating body is rotated in the direction toward the one rotating body by the biasing force of the means and the other rotating body is pressed against the one rotating body. And a driving force transmitting / blocking means for blocking the arm.

In order to achieve the above object, in the bobbin residual thread removing device according to a second aspect, in addition to the first aspect, the transmission of the driving force to the rotating arm by the driving force transmitting / cutting means is performed. I tried to do it via the cam.

In order to achieve the above object, the bobbin residual thread removing device according to a third aspect of the present invention includes a bobbin that is rotatably supported, and a pair of rotatable rotating bodies that enclose and discharge a lower thread that hangs down from the bobbin. Drive means for rotating one of the pair of rotating bodies so as to rotate in a forward or reverse direction; a rotating arm that supports the other of the pair of rotating bodies and is supported so as to be rotatable about one axis; When the rotating body rotates in a direction opposite to the lower thread discharging rotation direction, the driving force by the driving means is applied to the rotating arm so that the other rotating body rotates in a direction away from the one rotating body. On the other hand, the rotation of the driving force by the drive means causes the other rotating body to rotate in the direction toward the one rotating body when the one rotating body rotates in the lower thread discharge rotation direction. Transmission to the arm and the other rotating body Equipped when the pressing state drive force transmission means for transmitting while sliding driving force to the rotating arm by the driving means so as to hold the pressing force, against one of the rotating body.

[0015]

According to the bobbin residual yarn removing device of the first aspect, when one of the rotating bodies is rotated in the direction opposite to the lower yarn discharge rotation direction by the driving means, the driving force transmitting / cutting means drives the driving means. The driving force is transmitted from the to the rotating arm that supports the other of the pair of rotating bodies, and the rotating arm rotates in a direction in which the other rotating body is separated from the one rotating body with one axis as a fulcrum. A space for introducing the lower thread is secured between the two rotating bodies, and the lower thread dripping from the bobbin enters between these spaces, and on the contrary, one rotating body is rotated in the lower thread discharge rotation direction by the drive means. Then, the driving force is cut off from the driving unit to the rotating arm by the driving force transmitting / cutting unit,
At this time, the rotating arm rotates about the one axis by the biasing force of the biasing means so that the other rotating body moves toward the one rotating body, and the other rotating body presses against the one rotating body. In this state, the bobbin thread is sandwiched between the two rotating bodies, and the bobbin residual thread is caught and discharged by the cooperation of both rotating bodies. Therefore, there is no limit to the amount of residual yarn discharged by the rotary body. Further, since the rotating body winds up and discharges the yarn end, the rotating body also has a function of guiding the yarn end. Further, since the rotating body also having the function of guiding the yarn end is not configured to wind up the residual yarn around the rotating body, it can be arranged close to the yarn end outlet of the bobbin case. Further, the device does not have complicated parts such as elastic linear members, and the number of parts is small. Further, since the driving means for one rotating body and the driving means for the rotating arm are not separately provided but both are driven by one driving means, the driving means is provided separately. In comparison, the number of parts is reduced and an empty space is created.

According to the bobbin residual yarn removing device in the second aspect, when the driving force is transmitted to the rotating arm by the driving force transmitting / cutting means through the cam, one rotation is performed. The opening angle of the rotating arm when the other rotating body separates from the body is set according to the cam shape.

According to the bobbin residual yarn removing device of the third aspect, when one of the rotating bodies is rotated in the direction opposite to the lower yarn discharge rotation direction by the drive means, the pair of drive force transmitting means causes the drive means to move the pair of rotary bodies from the drive means. The driving force is transmitted to the rotating arm that supports the other of the rotating bodies, and the rotating arm rotates about the one axis in the direction in which the other rotating body is separated from the one rotating body. A space for introducing the lower thread is secured between
A bobbin thread dripping from the bobbin enters between the spaces, and conversely, when one of the rotating bodies is rotated in the bobbin thread discharge rotation direction by the drive means, the drive force transmission means causes the drive means to rotate the arm. The driving force is transmitted, and the rotating arm rotates about the one axis as a fulcrum in a direction in which the other rotating body moves toward the one rotating body, and the lower thread is sandwiched between the two rotating bodies so that the other rotating body moves in one direction. When a pressing state is applied to the rotating body, the driving force is transmitted from the driving means to the rotating arm by the driving force transmitting means so that the pressing force is retained, and one rotating body is not supported. The bobbin residual yarn is wound and discharged by the cooperation of both rotating bodies while continuing to rotate in the lower yarn discharging rotation direction.
Therefore, there is no limit to the amount of residual yarn discharged by the rotary body. Further, since the rotating body winds up and discharges the yarn end, the rotating body also has a function of guiding the yarn end. Further, since the rotating body also having the function of guiding the yarn end is not configured to wind up the residual yarn around the rotating body, it can be arranged close to the yarn end outlet of the bobbin case. Further, the device does not have complicated parts such as elastic linear members, and the number of parts is small. Further, since the driving means for one rotating body and the driving means for the rotating arm are not separately provided but both are driven by one driving means, the driving means is provided separately. In comparison, the number of parts is reduced and an empty space is created.

[0018]

Embodiments of the present invention will now be described in detail with reference to the drawings. As shown in FIGS. 1 and 10, the automatic bobbin thread feeder of this embodiment includes a bobbin thread winding device 162, a residual thread removing device 161, a bobbin thread winding position C of these bobbin thread winding devices 162, and a residual thread winding device 162. A bobbin exchanging device 160 capable of moving the bobbin case 2 to a remaining yarn removing position B of the yarn removing device 161, a shuttle position (bobbin case attaching / detaching position) A, and a bobbin case attaching / detaching position D of a dummy shaft (bobbin case holding means) 6. The outline of the sewing machine is based on the sewing machine bed 1
It is provided under 01. First, FIGS.
The bobbin changing device 160 will be described below with reference to FIG.

In FIGS. 11 to 15, reference numeral 1 is a hook on which the bobbin case 2 is mounted, 1a is a hook shaft, and 3 is a stand installed on a main base attached to the main body of the sewing machine. 3A and 3B respectively show a base plate as a support body provided on the base plate 3. 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 a base plate. It is in a state of being cantilevered by 3.

On the end 4b side (opposite to the base plate) of the transfer shaft 4, a transfer block 12 is formed in which the outer peripheral surface of the hollow cylinder is cut at two locations along the axial direction so that the cut surfaces face each other. (See FIG. 11) is rotatably and slidably supported on the transport shaft 4.

On each cut surface of the transport block 12, one plate-shaped portion of the transport plates 10, 10 bent into an L-shape is fixed, and the other of the L-shaped transport plates is formed. As shown in FIG. 11, the plate-shaped portions of the plate are opposed to each other with the axis interposed therebetween.

One end of each of the holding portions 11 and 11 bent toward the shuttle along the axial direction is fixed to each of the transport plates 10 and 10, and the other of the holding portions 11 and 11 is fixed. A bobbin case gripping means (not shown) capable of gripping or releasing the bobbin case is fixed to each end (end facing the shuttle). As the bobbin case gripping means, for example, an automatic bobbin thread feeder of Japanese Unexamined Patent Publication No. 5-192476 or Japanese Patent Application No. 5-12196 previously filed by the present applicant.
The automatic bobbin thread automatic threading machine of Japanese Patent Application No. 5-116363 filed by the applicant of the present application, including a pair of electromagnet adsorption heads described in the automatic bobbin thread feeder of the sewing machine of No. 0 specification. Appropriate ones such as those using the lever claws described in the supply device can be adopted, and the point is that the bobbin case 2 may be an opposing member (for example, the shuttle 1) if necessary.
Anything that can be attached to and detached from is acceptable.

A rotating gear 13 is fixed to the outer periphery of the transfer block 12, and the rotating gear 13 has a long drive shape along the direction of the shuttle shaft 1a as shown in FIG. The gear 19 is meshed. The drive gear 19 has one end attached to the motor fixing plate 2 attached to the base plate 3.
1 is rotatably supported by a portion protruding toward the other end of the transport shaft, and the other end is directly connected to the output shaft of the rotary motor 20 fixed to the motor fixing plate 21.

Therefore, when the rotation motor 20 rotates, the transfer block 12 is moved through the drive gear 19 and the rotation gear 13.
A rotating arm 70 composed of the carrier plates 10, 10 and the holding portions 11, 11 is adapted to rotate. In this embodiment, the rotating operation of the rotating arm 70 is performed when the rotating arm 70 is in the retracted position (see FIGS. 12 to 14). Also,
The transport shaft 4 is cantilevered, but since it is guided by the drive gear 19, its supporting strength is sufficient.

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.

The linear motion collar 14 has a structure shown in FIGS.
, One end of a rack 16 movably supported in parallel with the shuttle shaft 1a is fixed.
A pinion 17 meshes with the other end of 6. The pinion 17 is a moving motor 18 attached to the base plate 3.
It is fixed to the output shaft of.

Therefore, when the moving motor 18 is driven, the linear motion collar 14, together with the rack 16 via the pinion 17,
The rotating arm 70 is configured to move along the axial direction of the transport shaft 4. 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 transport 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. As shown in FIGS. 11 and 12, a sensor plate 32 is fixed to the rotating arm 70, and when the rotating arm 70 rotates, the sensor plate 32 causes the light emitting element 31a and the light receiving element 31b to rotate. The positions of the rotation sensor 31, the sensor fixing plate 33, and the sensor plate 32 are adjusted so that the rotation sensor 31, the sensor fixing plate 33, and the sensor plate 32 can pass therethrough.

As shown in FIGS. 11 and 13, a linear motion sensor 41 having the same structure as the rotation sensor 31 is attached to the base plate 3. A sensor plate 15 is fixed to the rack 16 and the rotating arm 70 is attached.
The positions of the linear motion sensor 41 and the sensor plate 15 are adjusted so that the sensor plate 15 can pass between the light emitting element 41a and the light receiving element 41b of the linear motion sensor 41 when the linear motion is performed.

Further, as shown in FIG. 10, at a position opposite to the rotation locus of the bobbin case gripping means on the base plate 3 and directly below the shuttle 1 as shown in FIG. 10, a dummy shaft 6 as a bobbin case holding means is provided. Is fixed. As shown in FIG. 15, the dummy shaft 6 has the same structure as the inner hook shaft 5, and can hold the bobbin case 2 by pushing the bobbin case 2 containing the bobbin. . Then, the existing bobbin locking claw 2d of the bobbin case 2 that has been pushed in, as shown in FIGS. 10 and 15, is provided with a rotation stopping member 5aa protruding near the dummy shaft 6.
It is configured to engage with the locking groove of. That is, the bobbin case 2 is positioned and held at a predetermined position.

By the way, as shown in FIG. 10, the bobbin thread winding position C and the residual yarn removing position B are in the range V below the conveying shaft 4 and from the upright plane along the coaxial line from the sewing machine bed 1.
The range W on the side of the rotation fulcrum 103 when raising 01,
The bobbin case gripping means is arranged at a position opposite to the rotation locus of the holding means. The residual thread removing position B is arranged below the lower thread winding position C. The position of the residual thread removing position B in the transport axis direction (the direction perpendicular to the paper surface in FIG. 10) is the retracted position of the bobbin case gripping means, and the position of the lower thread winding position C in the transport axis direction is the bobbin case gripping means. Is slightly advanced from the retracted position (position advanced toward the paper surface in FIG. 10) (see FIG. 1 for the positions of the residual thread removing position B and the bobbin thread winding position C in the axial direction). In addition, reference numeral 102 in FIG. 10 indicates 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.

At the bobbin winding position C, the bobbin winding device 16 is provided.
2 are provided. As the bobbin thread winding device 162, as shown in FIG. 1, by driving a winding motor (not shown), this rotational driving force is transferred to the motor shaft pulley 200, the timing belt 201, and the winding pulley 202.
To the take-up clutch plate 203, and the clutch pawls of the take-up clutch plate 203 are transferred to the bobbin exchanging device 16
By rotating the bobbin 7 by engaging the existing hole 7b (see FIG. 5) of the bobbin 7 accommodated inside the bobbin case 2 which has been conveyed to the bobbin winding position C by 0, the bobbin 7 is automatically rotated. A structure in which the lower thread can be wound around 7 is adopted. Further, by driving a threading motor (not shown), this rotational driving force is rotatably arranged around the bobbin case 2 set at the lower thread winding position C via the moving knife rotating gear 206. The lower thread wound around the bobbin 7 and transmitted from the bobbin case 2 to the bobbin case 2 is transmitted to the bobbin case 2 by rotating the bobbin case 2 around the bobbin case 2. The thread can be hooked so as to be drawn out from the lower thread outlet under the lower thread tension spring. Furthermore,
The lower thread pulled out from the lower thread outlet under this lower thread tension spring is
The moving knife thread separating unit 204 separates the bobbin thread from the bobbin thread supply source (not shown) drawn out from the bobbin thread drawing hole under the bobbin thread tension spring between the bobbin thread and the fixed knife 205. It is composed. Incidentally, the lower thread winding device (including the thread hooking and thread cutting mechanism) 162 is not limited to the one having the above-mentioned configuration, 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, Japanese Patent Application Laid-Open No. 5-192476 discloses a lower thread automatic feeder or Japanese Patent Application No. Appropriate ones can be adopted, including the bobbin changing device for the sewing machine described in No. 121960 and the bobbin winding device described for the bobbin changing device for the sewing machine in Japanese Patent Application No. 5-116363.

At the residual yarn removing position B, a residual yarn removing device 161 is arranged. The residual thread removing device 161 will be described below with reference to FIGS. 1 and 2.

In the figure, reference numeral 79 indicates a rotating shaft. The rotary shaft 79 penetrates the base plate 3 and is rotatably attached to both side plates 80a and 80b of a U-shaped residual thread bracket 80 arranged so as to sandwich the base plate 3. 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 a front side (left side in FIG. 1) side plate 80a of the residual thread bracket 80, and a back side (FIG. 1).
On the right side) of the side plate 80b, a residual yarn roller drive pulley 83 is fixed to a shaft portion protruding from the side plate 80b. A motor bracket 3a is arranged on the inner side of the base plate 3, and the residual thread winding motor 8 is attached to the motor bracket 3a.
6 is fixed. 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
As shown in FIG. 1, a rotating arm 85 as a U-shaped rotating arm is arranged between a and the base plate 3. Both side plates 85 forming the U-shape of the rotating arm 85
A rotary shaft 80c is rotatably stretched around a and 85b, and a driven roller 761 as a rotating body is fixed to a shaft portion protruding further from the front side plate 85a to the front side. A shaft 87 arranged parallel to the shuttle shaft 1a is fixed to the lower portion of the rotary arm 85. The shaft 87 penetrates the base plate 3 and is rotatably provided on both side plates 80a and 80b of the residual thread bracket 80. The shaft 87 is always provided in the middle of the shaft 87 as shown in FIG. A torsion coil spring 210 is provided as a biasing means for biasing in the counterclockwise direction (CCW direction).

A one-way clutch 211 as a driving force transmission / interruption means is provided on the outer periphery of the shaft portion of the shaft 87 which projects further from the inner side plate 80b on the inner side, and the one-way clutch 211 has an outer periphery. The rotary arm drive gear 88 is fixed. This one-way clutch 211 is in a locked state when a rotational driving force in the clockwise direction (CW direction) in FIG. 2 is applied from the rotational arm driving gear 88, and transmits the rotational driving force to the shaft 87, while When the rotational drive force in the counterclockwise direction (CCW direction) in FIG. 2 is applied from the drive gear 88, the locked state is released and the drive state becomes free in the same direction so that the drive force in the rotational direction is blocked from the shaft 87. It is configured. A rotary arm transmission gear 91 meshes with the rotary arm drive gear 88, and the rotary arm transmission gear 91 is fixed to an intermediate portion of the rotary shaft 79.

Therefore, when the residual thread winding motor 86 is driven in the CCW direction in FIG. 2, its rotation is transmitted to the rotary arm transmission gear 91 via the residual thread winding pulley, the residual thread belt, and the residual thread roller driving pulley 83. The rotation direction is changed to the CW direction in FIG. 2 through the rotary arm drive gear 88, and this rotary drive force is transmitted to the shaft 87 by the one-way clutch 211, and the rotary arm 85 is rotated about the shaft 87 as a fulcrum. It rotates in the CW direction in 2.

When the residual thread winding motor 86 is driven in the CW direction in FIG. 2, its rotation is transmitted to the rotary arm transmission gear 91 via the residual thread winding pulley, the residual thread belt, and the residual thread roller driving pulley 83. The rotation direction is CCW in FIG. 2 due to the rotation arm drive gear 88.
The one-way clutch 21
1, the rotary arm 85 is blocked from the shaft 87 and is free in the CCW direction in FIG.

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, in the residual thread removing device 161, the bobbin case 2 set to the residual thread removing position B by the rotating arm 70 is directed to the bobbin thread leading portion (bottom thread leading portion of the bobbin thread tension spring). An air nozzle 100 for dropping yarn is provided so that air can be sprayed (see FIG. 2). The thread drooping air nozzle 100 is for reliably hanging the bobbin thread drawn from the bobbin case 2 from the bobbin case 2 and attached to the bobbin case 2 downward by the air force. An electromagnetic valve (not shown) is connected to the yarn dropping air nozzle 100, and the air blowing of the yarn dropping air nozzle 100 is controlled by the electromagnetic valve.

Further, as shown in FIG. 2, the rotating arm 70 of the bobbin exchanging device 160 has a bobbin thread hanging from a bobbin case 2 (more specifically, a bobbin thread tension spring) which accommodates the bobbin 7 therein. An air nozzle 151 for blowing the end M to the working position is fixed. The working position referred to here is a position where the bobbin thread end portion M is in contact with the outer peripheral surface of the drive roller 760 (more accurately, the outer peripheral surface on the lower side in the drawing) and flutters downstream (see FIG. 2B). When the lower thread end portion M is blown to the work position, the air from the air nozzle 151 is blown toward the outer peripheral surface of the bobbin case 2 and is directed toward the outer peripheral surface of the drive roller 760 along the outer peripheral surface. It is achieved by creating a flow. A solenoid valve, not shown, is connected to the air nozzle 151, and the air nozzle 151 is designed to control the air blowing thereof.

As shown in FIG. 1, the front side plate 80a of the bracket 80 of the residual thread removing device 161 is provided with, for example, a reflection type optical sensor 5 as a rotation detecting means.
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 side is bored 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 is rotated by the residual thread removing operation by the residual thread removing device 161, the reflection type optical sensor 50 is rotated.
From 0, a continuous pulse wave is 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.

As described above, the residual thread removing device 161 is constructed, and basically, the bobbin is wound around the bobbin 7 and the bobbin thread hanging from the bobbin case 2 is pulled out. It is arranged below B (see FIG. 1).

Next, the operation of the automatic bobbin thread feeder configured as described above will be described below. First, for example, in order to allow one of the bobbin case gripping means to grip the bobbin case accommodating the bobbin on which the bobbin has been wound, the hand is inserted from the turning arm side (front side; left side in FIG. 1), and the bobbin winding is performed. The bobbin case accommodating the rotated bobbin is inserted into the dummy shaft 6 by pushing the bobbin case into the dummy shaft 6 without turning the palm of the hand in the same manner as when mounting the bobbin case on the inner shuttle shaft 5. Here, for convenience of description, the reference numeral 2X of this bobbin case will be referred to as the reference numeral 2Y of the bobbin case described below.

Next, when the power switch is turned on, the rotary arm 70 is returned to the original position, and when the start switch is turned on, the rotary arm 70 is rotated so that one bobbin case holding means faces the dummy position D. Let Then, the rotating arm 70 is moved forward so that one bobbin case holding means holds the bobbin case 2X containing the bobbin already wound on the dummy shaft 6.
At this time, the other bobbin case holding means moves toward the shuttle without interfering with any obstacle.

Here, the dummy shaft 6 is attached to the residual yarn removing position B,
When the bobbin thread winding position C is provided on the opposite side of the transport shaft 4 from the center, the residual yarn removing position B is, as described above,
Since the position in the transport axis direction is at the retracted position of the bobbin case gripping means, and the position of the lower thread winding position C in the transport axis direction is at a position slightly advanced from the retracted position of the bobbin case gripping means, one bobbin When the case gripping means is moved toward the dummy shaft 6, the other bobbin case gripping means collides with the residual thread removing device 161 and the bobbin thread winding device 162. However, in the present embodiment, as described above, the dummy shaft 6 is located at the position opposite to the rotation locus of the bobbin case gripping means and directly below the shuttle 1. Therefore, there is no problem.

Then, the rotating arm 70 is moved backward and rotated so that one bobbin case holding means holding the bobbin case 2X faces the hook 1 and is moved forward to accommodate the bobbin wound bobbin. Bobbin case 2X
Install in the pot. At this time, the other bobbin case holding means moves toward the dummy shaft 6 without interfering with any obstacle. Then, the rotating arm 70 is retracted. At this time, the worker inserts his / her hand again from the side of the rotating arm in the same manner as described above, and mounts the bobbin case 2Y accommodating the bobbin on which the lower thread has been wound onto the dummy shaft 6.

Then, when the sewing is started, the bobbin wound with the bobbin thread held by the dummy shaft 6 is accommodated in one of the bobbin case gripping means by the same operation as above during the sewing. The bobbin case 2Y is gripped and the rotating arm 70 is retracted.

When the predetermined sewing is completed in this state (step 1), the bobbin case 2 is replaced in step 2.

That is, the bobbin case gripping means not gripping the bobbin case is advanced to take out the bobbin case 2X containing the bobbin in which the remaining thread is reduced, and the rotating arm 70 is retracted. Next, the rotating arm 70 is rotated to make the bobbin case 2Y containing the bobbin wound bobbin face the shuttle 1 and move forward to mount the bobbin case 2Y containing the bobbin wound bobbin in the shuttle. Then, the rotating arm 70 is retracted.

Then, in step 3, when sewing is started in step 3, the rotating arm 70 is rotated during the sewing, and the bobbin case 2X accommodating the bobbin in which the remaining thread is reduced remains in the remaining thread. Rotate to the removal position B.

At this time, the rotary arm 85 is at the position shown in FIG. 2C, that is, at the position where the driving roller 760 and the driven roller 761 are in contact with each other. Then, the process proceeds to step 4, in which the residual yarn winding motor 86 is moved to the position shown in FIG.
In the CCW direction to rotate the drive roller 760 in the same direction, and at the same time, the rotary drive force whose rotational direction is reversed by the rotary arm drive gear 88 is applied to the one-way clutch 2
11 transmits the rotation arm 85 to the shaft 87.
2 is rotated in the CW direction in FIG.
As shown in (a), the driven roller 761 is separated from the drive roller 760 to provide a space between the rollers 760 and 761.

Next, in step 5, in step 5, thread dropping air is supplied from the thread dropping air nozzle 100 as shown in FIGS. 2 (a) and 4 (a).
It is sprayed intermittently for a predetermined period of time to surely hang the lower thread downward from the lower thread deriving portion (lower thread deriving portion of the lower thread tension spring) of the bobbin case 2X, and the process proceeds to step 6, and in step 6, this time, The yarn guide air is blown from the air nozzle 151 (see FIG. 2B and FIG. 4B), and the lower yarn end portion M hanging from the bobbin case 2X is blown to the working position.

Next, in step 7, in step 7, the residual thread winding motor 86 is driven in the CW direction in FIG. 2 to drive the drive roller 760 in the same direction (lower thread discharge rotation direction P; see FIG. 2 (b)). Rotate to. Then, the rotation driving force whose rotation direction is reversed by the rotation arm drive gear 88 is cut off from the shaft 87 by the one-way clutch 211, and the rotation arm 85 becomes free in the CCW direction in FIG. At this time, the rotating arm 85 is rotated in the CCW direction in FIG. 2 about the shaft 87 by the urging force of the torsion coil spring 210 (see FIG. 2B).

Next, in step 8, the driven roller 761 faces the drive roller 760 in step 8, but before the lower thread end portion M is sandwiched between the rollers 760 and 761, air is blown by the air nozzle 151. Is stopped (see FIG. 4B).

Here, when air is blown by the air nozzle 151 when the lower 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, the bobbin thread end portion M escapes from between the rollers 760 and 761 and is not caught and discharged by the rollers 760 and 761, but is blown to the working position by the air nozzle 151 as in the present embodiment. Before the lower thread end portion M is sandwiched between the rollers 760 and 761 by the movement of the roller 761,
As shown in FIG. 11, when the air from the air nozzle 151 is shut off, the blown up bobbin thread end portion M hangs down on the outer peripheral surface of the rotating driven roller 761 and the driven roller 761 is further moved. Torsion coil spring 210
When the lower thread end portion M is rotated between the rollers 760 and 761 by being rotated by the urging force of the roller 760 and opposed to the roller 760 to be in a pressed state (step 9).

Then, in step 9, since the driving roller 760 is rotating in the CW direction, the roller 76
The bobbin thread clamped between 0 and 761 is
By the co-rotation of No. 1, it is discharged downstream while being caught by the rollers 760 and 761 (see FIG. 2C).

Then, the process proceeds to step 10 and step 1
At 0, it is determined whether or not the residual yarn of the bobbin 7 is removed. This is because the residual yarn is discharged downstream while being wound around the rollers 760 and 761 due to the co-rotation of the rollers 760 and 761 (the residual yarn is being removed).
If the bobbin 7 rotates and is not discharged (remaining yarn is not removed), it is determined that the bobbin 7 does not rotate. 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 yarn is not removed, the process returns to step 4 to retry and the above operation is repeated. If you perform this retry operation three times in a row,
In the present embodiment, an alarm is generated to notify the operator of the abnormality, assuming that some sort of failure in which the residual yarn cannot be removed occurs.

When it is determined in step 10 that the bobbin 7 is rotating, that is, the residual yarn is removed, the process proceeds to step 11, and in step 11,
This time, 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 repeated until the bobbin 7 stops,
On the other hand, when it is determined that the bobbin 7 has stopped and the removal of the residual yarn is completed, the process proceeds to step 12, and in step 12,
The residual thread winding motor 86 is stopped and the driving roller 760 is stopped to end this flow.

When the residual thread is removed in this way, the rotary arm 70 is rotated to make the bobbin case 2X containing the empty bobbin face the bobbin winding position C and then to move the bobbin case 2X forward to wind the bobbin. The bobbin case is moved to the turning position C, the bobbin thread is wound around the empty bobbin by the bobbin thread winding device 162, threading and thread cutting are performed, and then the rotating arm 70 is retracted and rotated to open the bobbin case. The bobbin case gripping means, which is not gripped, is made to face the shuttle 1 and waits until a bobbin replacement command is issued. After that, these operations are repeated.

As described above, in this embodiment, the lower thread end portion M hanging from the bobbin case 2 having the bobbin 7 accommodated therein is wound by the rollers 760 and 761 and discharged, and the residual thread discharge amount is not limited. With this configuration, it is possible to automatically remove all the bobbin residual yarn. In addition, the rollers 760 and 761 have the yarn end wound up and ejected so that the rollers 760 and 761 also have a yarn end guiding function, and the rollers 760 and 761 also have a yarn end guiding function. The remaining yarn can be reliably caught and removed because it is arranged so as to be close to the yarn end outlet. Further, since there is no complicated part such as an elastic linear member like the device described in Japanese Patent Application Laid-Open No. 7-68071, and the number of parts is reduced, the cost can be reduced.

Further, before the lower thread end portion M blown to the working position by the air nozzle 151 is sandwiched between the rollers 760 and 761 by the movement of the driven roller 761, the air of the air nozzle 151 is shut off and the lower thread end is cut off. Since the portion M is satisfactorily wound and discharged by the rollers 760 and 761, it is possible to reliably catch and remove the residual yarn.

Even if the bobbin thread drawn out from the bobbin case 2 bobbin case is attached to the bobbin case 2, the bobbin case 2 moves toward the bobbin case 2 bobbin case 2 by the thread dropping air nozzle 100. Since air is blown and the air is used to release the attachment of the yarn and hang the yarn securely downward, the residual yarn can be reliably removed by the subsequent residual yarn removing operation.

Further, particularly in this embodiment, the drive roller 760 is rotated by the residual thread winding motor 86 in the direction opposite to the lower yarn discharge rotation direction P, and the one-way clutch 211 causes the residual thread winding motor 86 to drive the driven roller 761. The driving force is transmitted to the rotating arm 85 which is supported, and the rotating arm 85 is rotated about the shaft 87 in the direction in which the driven roller 761 is separated from the driving roller 760, and both rollers 76 are rotated.
A space for introducing the lower thread between 0 and 761 is secured, and the lower thread that hangs down from the bobbin 7 is inserted into this space. On the contrary, the drive roller 760 is discharged by the residual thread winding motor 86 from the lower thread. It rotates in the rotation direction P, and the driving force from the residual thread winding motor 86 to the rotating arm 85 is shut off by the one-way clutch 211. At this time, the torsion coil spring 21
By the biasing force of 0, the rotary arm 85 is rotated about the shaft 87 so that the driven roller 761 moves toward the drive roller 760, and the driven roller 761 is pressed against the drive roller 760 by setting both rollers 760, 761. The bobbin residual thread is put between the rollers 760 and 76 by sandwiching the lower thread between them.
1 and 2 are driven by the residual yarn winding motor 86 as one driving means without separately providing the driving means for the driving roller and the driving means for the rotary arm 85. The number of parts (motors, brackets, shafts, gears, etc.) is reduced and an empty space is created compared to the case where the means are provided separately, so that cost reduction and design flexibility are improved. Is possible.

If the drive means for the drive roller and the drive means for the rotary arm 85 are separately provided, the roller 76 is provided.
The drive means for the rotary arm 85 must be continuously excited during the pressure contact of 0,761. However, in the present embodiment, since this is not the case, the drive means is provided separately. It is also possible to improve reliability related to durability.

FIG. 7 shows the essential parts of the residual thread removing device according to the second embodiment of the present invention. FIG. 7 (a) is a front view showing the initial status of the residual thread winding motor and the status during CW rotation. ,
(B) is a front view showing a state of the residual thread winding motor at the time of CCW rotation, and the same components as those in the first embodiment are designated by the same reference numerals.

In the residual thread removing device of the second embodiment, the rotary arm transmission gear 91, the rotary arm drive gear 88 and the one-way clutch 211 in the first embodiment are eliminated. That is, the shaft 87 to which the rotating arm 85 is fixed is rotatably stretched over both side plates 80a and 80b of the bracket 80 and is urged by the torsion coil spring 210 in the CCW direction in FIG. Has become.

Also, the bracket 80 on the rotary shaft 79
A one-way clutch 211a is provided on the outer periphery of the shaft portion between the both side plates 80a and 80b, and a cam 220 having a fan-shaped cross section is fixed to the outer periphery of the one-way clutch 211a. This one-way clutch 211a is
Counterclockwise direction (CCW direction) in FIG. 7 from the rotating shaft 79
When the rotation driving force of the rotation shaft 79 is locked, the driving force in the rotation direction is transmitted to the cam 220 while the rotation shaft 79 is locked.
When the rotational driving force in the clockwise direction (CW direction) in FIG. 7 is applied, the locked state is released and the driving force in the rotational direction is freed from the cam 220. . Note that reference numeral 221 indicates a stopper, and since other configurations are similar to those of the first embodiment, description thereof is omitted here to avoid duplication.

Therefore, in the initial state, the rotary arm 85 is at the position shown in FIG. 7A, that is, at the position where the driving roller 760 and the driven roller 761 contact each other.
In addition, the end of the side plate 85a of the rotating arm 85 and the protrusion 220a of the cam 220 are in contact with each other.

Then, when the residual thread winding motor 86 is driven in the CCW direction in FIG. 7 and the drive roller 760 is rotated in the same direction, this rotational driving force is applied to the one-way clutch 211.
a is transmitted to the cam 220, the cam 220 rotates in the CCW direction with the shaft 79 as a fulcrum, and the driving force (pressing force) is transmitted to the rotary arm 85 by the tip end portion 220a of the cam 220. The rotary arm 85 rotates about the shaft 87 in the CW direction in FIG.
As shown in (b), the driven roller 761 is separated from the driving roller 760 so that a space is generated between the two rollers 760 and 761.

When the residual thread winding motor 86 is driven in the CW direction in FIG. 7 to rotate the drive roller 760 in the same direction (lower thread discharge rotation direction P; see FIG. 2 (b)), this rotational driving force is generated. The cam 22 by the one-way clutch 211a
0, the cam 220 is CCW in FIG.
It becomes free with respect to the direction, and at this time, the rotating arm 85
Rotates about the shaft 87 as a fulcrum in the CCW direction in FIG. 7 by the urging force of the torsion coil spring 210, and the driven roller 761 is pressed against the drive roller 760 by this urging force (FIG. 7A). reference).

That is, it is needless to say that the same operation as that of the first embodiment described above can be performed, and therefore the same effect as that of the first embodiment can be obtained.

Moreover, in the second embodiment, the driving force is transmitted to the rotary arm 85 by the one-way clutch 211a via the cam 220, and the rotary arm when the driven roller 761 is separated from the drive roller 760. Since the opening angle of 85 can be set according to the shape of the cam 220, it is possible to further increase the degree of freedom in design and further enhance the above-described effect.

Further, as compared with the first embodiment, the rotary arm transmission gear 91 and the rotary arm drive gear 88 can be eliminated, so that the cost can be further reduced and the above-mentioned effects can be further enhanced. Has become.

FIG. 8 shows the essential parts of the residual thread removing device in the third embodiment of the present invention. FIG. 8 (a) is a front view showing the initial state of the residual thread winding motor and the state during CW rotation. ,
(B) is a front view showing a state of the residual thread winding motor during CCW rotation, and the same parts as those in the second embodiment are designated by the same reference numerals. Is omitted.

The residual thread removing device of the third embodiment is the second one described above.
The difference from the embodiment is that the cam 22 is replaced by the cam 22.
5, the open angle of the rotary arm 85 when the driven roller 761 is separated from the drive roller 760 can be made larger than that of the cam 220 according to the shape of the cam 225. Is.

It is needless to say that even with this structure, the same effect as that of the second embodiment can be obtained.

FIG. 9 is a right side view of an automatic bobbin thread feeder to which the residual thread removing device in the fourth embodiment of the present invention is applied.
In the residual thread removing device according to the fourth embodiment, the rotary arm 85 is fixed, penetrates the base plate 3, and is coaxial with the shaft 87 rotatably hung on both side plates 80a and 80b of the residual thread bracket 80. The cup-shaped friction clutch plate 250b, the clutch pressure contact spring 250c, and the open end of which are open to the front side from the left side of the side plate 85b on the back side of the rotary arm 85 toward the right side in the figure. A cup-shaped storage portion 250a and a rotary arm drive gear 88 having the storage portion 250a fixed to the end are sequentially arranged.
The friction clutch plate 250b and the clutch pressure contact spring 25
0c, the accommodating portion 250a, and the rotary arm drive gear 88 are rotatably supported by the shaft 87 with the shaft center penetrated by the shaft 87. The clutch pressure contact spring 250c
Is housed between the friction clutch plate 250b and the housing portion 250a, and is disposed in the clutch pressure contact spring 250c by a plurality of pins (not shown) fixed between the friction clutch plate 250b and the housing portion 250a.
b, the rotation in the storage portion 250a is restricted.

That is, the side plate 85b on the back 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. Here, the friction clutch plate 250b, the clutch pressure contact spring 250c, and the storage portion 250a constitute a driving force transmission means 250. Since the other configurations are similar to those of the first embodiment, the description thereof is omitted here to avoid duplication.

Therefore, in the initial state, the rotary arm 85 is at the same position as in the first embodiment, that is, at the position where the driving roller 760 and the driven roller 761 abut.

When the residual yarn winding motor 86 is driven in the CCW direction and the drive roller 760 is rotated in the same direction as in the first embodiment, the rotational driving force is reversed by the rotary arm drive gear 88. The rotational driving force reversed by the lever is stored in the storage portion 250a, the clutch pressure contact spring 250c,
Friction is transmitted to the rotary arm 85 via the friction clutch plate 250b, and the rotary arm 85 rotates in the CW direction about the shaft 87 as a fulcrum, and the driven roller 76 with respect to the drive roller 760.
1 are separated so that a space is generated between the rollers 760 and 761.

When the residual thread winding motor 86 is driven in the CW direction to rotate the drive roller 760 in the same direction (lower thread discharge rotation direction P; see FIG. 2B), this rotational drive force drives the rotary arm. The rotation direction is reversed by the gear 88, and the reversed rotational driving force is frictionally transmitted to the rotary arm 85 via the housing portion 250a, the clutch pressure contact spring 250c, and the friction clutch plate 250b, and the rotary arm 85 is rotated by the shaft 87.
Is rotated in the CCW direction with the fulcrum as a fulcrum, and the driven roller 761 is pressed against the drive roller 760.

When the driven roller 761 is pressed against the drive roller 760 in this way, the rotary arm 8 is moved.
It becomes impossible to rotate in the CCW direction around the shaft 87 of 5 as a fulcrum, and a slip occurs between the friction clutch plate 250b and the side plate 85b on the back side of the rotating arm 85, and no further pressing force is applied. The drive roller 760 continues to rotate in the CW direction as it is in the state (the state in which the pressing force is maintained). Therefore, the lower thread sandwiched between the rollers 760 and 761 is discharged downstream while being wound around the rollers 760 and 761 due to the co-rotation of both rollers 760 and 761.

That is, it is needless to say that the operation is similar to that of the first embodiment described above, and therefore the same effect as that of the first embodiment can be obtained.

Although the invention made by the present inventor has been specifically described based on the embodiments, the invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say, for example, in the above embodiment, one roller is the driving roller and the other roller is the driven roller, but both driving rollers may be used.

The rollers 760 and 761 may be rubber rollers or toothed rollers.

Further, in the above embodiment, the air is blown intermittently by the yarn dropping air nozzle 100, but continuous blowing may of course be used. Further, although the thread dropping air nozzle 100 is provided so as to be capable of spraying toward the thread leading portion of the bobbin case 2, instead of this, a plurality of thread dropping air is evenly directed toward the center of the bobbin case. Even if a nozzle is provided and a predetermined air flow is generated toward the bobbin case 2, the same effect can be obtained.

[0091]

As described above, according to the bobbin residual yarn removing device of the first aspect, one of the rotating bodies is rotated by the drive means in the direction opposite to the lower yarn discharge rotation direction to transmit the driving force. A direction in which the drive force is transmitted from the drive means to the rotary arm that supports the other of the pair of rotary bodies by the blocking means, and the rotary arm separates the other rotary body from the one rotary body with one axis as a fulcrum. And the space for introducing the lower thread is secured between the two rotating bodies, and the lower thread that hangs from the bobbin enters between these spaces. On the contrary, one rotating body is lowered by the drive means. The yarn discharge rotates in the rotation direction, and the driving force is interrupted by the driving force transmission / cutoff means from the driving means to the rotating arm.
By the urging force of the urging means, the rotating arm is rotated around the one axis so that the other rotating body is directed toward the one rotating body, and the other rotating body is pressed against the one rotating body. Since the bobbin residual thread is caught by the cooperation of both rotary elements and the bobbin residual thread is clamped between both rotary bodies and discharged, there is no limit to the residual thread discharge amount. It becomes possible to remove all. Further, the rotating body is wound around and ejects the yarn end so that the rotating body also has the function of guiding the yarn end, and the rotating body also having the function of guiding the yarn end approaches the yarn end outlet of the bobbin case. Since it is arranged so that it can be arranged, the residual yarn can be reliably removed. In addition, since there is no complicated part such as an elastic linear body and the number of parts is reduced, the cost can be reduced. Furthermore, it is possible to drive both of them by one driving means without separately providing the driving means for one of the rotating bodies and the driving means for the rotating arm, and the number of the driving means can be increased. Since the number of points is reduced and an empty space is generated, the cost can be reduced and the degree of freedom in design can be improved.

According to the bobbin residual yarn removing device of the second aspect, in addition to the first aspect, the driving force is transmitted to the rotating arm by the driving force transmitting / blocking means via the cam.
Since the opening angle of the rotating arm when one of the rotating bodies separates from the other rotating body can be set according to the cam shape, the degree of freedom in design is increased and the above-described effect is further enhanced. It is possible to raise it.

According to the bobbin residual yarn removing device of the third aspect, one of the rotating bodies is rotated by the driving means in the direction opposite to the lower yarn discharging rotation direction, and the driving force transmitting means causes the pair of rotating bodies to move from the driving means. A driving force is transmitted to a rotating arm that supports the other of the rotating bodies, and the rotating arm is rotated about one axis in a direction in which the other rotating body is separated from the one rotating body. Secure a space for introducing the lower thread between them, and let the lower thread that hangs from the bobbin enter between this space, on the contrary,
One of the rotating bodies is rotated in the lower yarn discharge rotation direction by the driving means, and the driving force is transmitted from the driving means to the rotating arm by the driving force transmitting means, and the rotating arm is rotated about the other axis with respect to one axis. When the body rotates in the direction toward one of the rotating bodies, the lower thread is sandwiched between the two rotating bodies, and the other rotating body is pressed against the one rotating body, the pressing force is maintained. , The driving force is transmitted by the driving force transmitting means from the driving means to the rotating arm while sliding, and one of the rotating bodies continues to rotate in the bobbin thread discharging rotation direction without being supported, so that the bobbin residual thread is removed from both rotating bodies. It is possible to automatically remove all the bobbin residual yarns because it is configured so that the residual yarn discharge amount is not limited by being entrained and discharged by the cooperation of the above. Further, the rotating body is wound around and ejects the yarn end so that the rotating body also has the function of guiding the yarn end, and the rotating body also having the function of guiding the yarn end approaches the yarn end outlet of the bobbin case. Since it is arranged so that it can be arranged, the residual yarn can be reliably removed. In addition, since there is no complicated part such as an elastic linear body and the number of parts is reduced, the cost can be reduced. Furthermore, it is possible to drive both of them by one driving means without separately providing the driving means for one of the rotating bodies and the driving means for the rotating arm, and the number of the driving means can be increased. Since the number of points is reduced and an empty space is generated, the cost can be reduced and the degree of freedom in design can be improved.

[Brief description of drawings]

FIG. 1 is a right side view of an automatic bobbin thread feeder to which a residual thread removing device according to a first embodiment of the present invention is applied.

FIG. 2 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. 3 is a flowchart showing an operation procedure of the above residual thread removing device.

FIG. 4 is a timing chart for explaining the operation of the above residual thread removing device.

FIG. 5 is a front view of the bobbin used in the present embodiment on the side of rotation detecting means.

FIG. 6 is a waveform diagram detected when the bobbin rotates.

FIG. 7 is a view showing a main part of a residual thread removing device according to a second embodiment of the present invention, in which (a) is a front view showing an initial state of a residual thread winding motor and a state during CW rotation; FIG. 6B is a front view showing a state of the residual thread winding motor during CCW rotation.

FIG. 8 is a view showing a main part of a residual thread removing device according to a third embodiment of the present invention, in which (a) is a front view showing an initial state of a residual thread winding motor and a state during CW rotation; FIG. 6B is a front view showing a state of the residual thread winding motor during CCW rotation.

FIG. 9 is a right side view of an automatic bobbin thread supplying device to which the residual thread removing device in the fourth embodiment of the present invention is applied.

FIG. 10 is a front view of the bobbin thread automatic feeding device showing the positional relationship of the respective devices used in the same upper and lower yarn automatic feeding device.

FIG. 11 is a front view of a bobbin changing device used in the same upper and lower thread automatic feeding device.

FIG. 12 is a plan view of the above bobbin changing device.

FIG. 13 is a right side view showing a linear motion mechanism portion of the above bobbin changing device.

FIG. 14 is a right side view showing a rotation mechanism portion of the above bobbin changing device.

FIG. 15 is a schematic side view for explaining dummy positions and dummy shafts of the bobbin changing device of the above.

[Explanation of symbols]

 7 Bobbin 85 Rotating Arm 86 Driving Means 87 Uniaxial 210 Energizing Means 211, 211a Driving Force Transmission / Blocking Means 220, 225 Cam 250 Driving Force Transmission Means 760 One Rotating Body 761 Other Rotating Body M Lower Thread P Lower Thread Discharge Direction of rotation

Claims (3)

[Claims] 1. A bobbin that is rotatably supported, a pair of rotatable bodies that entrain and discharge a bobbin that hangs from the bobbin, and a drive that rotates one of the pair of rotatable bodies so that it can rotate forward or backward. Means, a rotating arm that supports the other of the pair of rotating bodies, and is rotatably supported about one axis, and the other rotating body rotates about the one axis around the one axis. Urging means for urging toward the body, and the other rotating body rotates in a direction away from the one rotating body when rotating in a direction opposite to the lower thread discharge rotation direction of the one rotating body. While transmitting the driving force by the driving means to the rotating arm, the other rotating body is urged by the urging force of the urging means during rotation of the one rotating body in the bobbin thread discharge rotation direction. Turn toward one of the rotating bodies. And a driving force transmitting / cutting off unit for cutting off the driving force by the driving unit against the rotating arm so that the other rotating body presses against the one rotating body. Removal device. 2. The bobbin residual thread removing device according to claim 1, wherein the driving force is transmitted to the rotating arm by the driving force transmitting / cutting means via a cam. Residual thread removing device. 3. A bobbin that is rotatably supported, a pair of rotatable bodies that entrains and discharges a bobbin thread that hangs from the bobbin, and a drive that rotates one of the pair of rotatable bodies in a forward or reverse direction. Means, a rotating arm that supports the other of the pair of rotating bodies and is rotatably supported about one axis, and when rotating in a direction opposite to the lower thread discharging rotation direction of the one rotating body, While transmitting the driving force by the drive means to the rotating arm so that the other rotating body rotates in a direction away from the one rotating body, in the bobbin thread discharging rotation direction of the one rotating body. At the time of rotation, the drive force by the drive means is transmitted to the rotating arm so that the other rotating body rotates in the direction toward the one rotating body, and the other rotating body transmits to the one rotating body. Hold the pressing force The residual yarn removing device of the bobbin provided with the, drive force transmission means for transmitting while sliding relative to the pivot arm a driving force by the driving means so.