JPH08280968A - Bobbin-thread automatic supply device - Google Patents

Abstract

PURPOSE: To improve an immediate adaptability along with a durability of a conveying mechanism by shortening a conveying path of a bobbin case, lower the cost with a reduced number of parts by increasing common parts such as brackets, and dispense with miniaturization and precise designing of the apparatus by generating an allowance in a space within an oil pan. CONSTITUTION: A residual thread remover B and a bobbin thread winding position C are arranged side by side on a moving path of a bobbin case grabbing means by a first moving means for moving the bobbin case grabbing means in the direction of an axis line parallel with the axis of a shuttle of a sewing machine. Then, in the conveying of a bobbin case 2 between the positions B and C, there is no need for conveyance by a second moving means 20 to move the bobbin case grabbing means in the direction of approaching or separating from the moving path by the first moving means. Moreover, the positions B and C are made to approach further to each other as compared with the traditional art and further, a bobbin thread winding device 162 and a residual thread remover 161 are not arranged side by side in the direction of moving the bobbin case 2 by the second moving means 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic bobbin thread feeder.

[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, the sewing machine operation is temporarily stopped, the bobbin case is removed from the hook, the bobbin thread is wound around the bobbin, and the bobbin on which this bobbin thread is newly wound is placed in the bobbin case. A series of operations for accommodating and mounting the bobbin case in the shuttle are performed manually.

However, the manual operation of winding the bobbin thread around the bobbin and the operation of exchanging the bobbin case are extremely inefficient, which causes a decrease in productivity. Therefore, the applicant of the present application filed Japanese Patent Application No. 5-23
The above-mentioned problem is solved in the automatic bobbin thread feeder described in Japanese Patent No. 9194.

FIG. 35 shows the basic structure of the above apparatus.
Is. This device is arranged in a space where the bottom of the sewing machine bed is an oil reservoir, and the bobbin case attachment / detachment position (hook position) A and residual thread removing device 61X remove residual thread from the bobbin 7. The bobbin thread is wound around the bobbin 7 by the thread removing position G and the bobbin winding device 62X, and the bobbin winding positions H for hooking the bobbin case 2 and cutting the bobbin thread are located at 120 ° intervals around the guide shaft 50X. It is arranged respectively.

Both ends of the guide shaft 50X are rotatably supported by respective upright portions (not shown) provided upright on the main base. The guide shaft 50X extends along the guide shaft 50X. A rotating arm 51X which is slidable and rotatable with the guide shaft 50X is supported. The forward / backward movement of the rotary arm 51X along the guide shaft 50X is performed by the forward / backward lever 52X (first moving means), and the forward or reverse rotation operation is performed by a rotary drive device (second moving means) 60 not shown. It is done in units of °. A bobbin case holding means (not shown) capable of holding or releasing the bobbin case 2 containing the bobbin 7 is provided near each end of the rotating arm 51X. The bobbin case holding means and the rotating arm 51X are provided. The bobbin exchanging device 60X is configured by the above.

Then, by appropriately rotating, advancing or retracting the rotating arm 51X, the bobbin case 2 in the hook is moved.
And the bobbin case 2 accommodating the bobbin already wound with the lower thread can be grasped by the bobbin case grasping means and mounted in the kettle. . Further, by positioning the bobbin case 2 at the residual thread removing position G, the bobbin 7
The remaining thread of the lower thread can be removed, and the lower thread winding position H
Since the bobbin 7 is wound with the bobbin 7, the bobbin 7 can be hooked on the bobbin case 2 and the bobbin thread can be cut.

As described above, in the above apparatus, the bobbin 7 is wound around the bobbin 7 (including hooking the bobbin case and cutting the bobbin thread), the remaining thread removing work, and the bobbin case 2.
All replacement work is done automatically,
Work efficiency and productivity are improved.

[0008]

However, the above device has the following problems. That is, the bobbin case attaching / detaching position A, the residual yarn removing device G, the lower thread winding position H.
Are located at opposing positions on the movement path (rotation locus) of the bobbin case gripping means by the rotary drive device (second moving means), and are opposed to positions forming a triangle with the bobbin case attachment / detachment position A as the apex. Since they are arranged at the respective positions, there is a problem that the conveyance route to each position becomes long, the conveyance takes time, and the responsiveness deteriorates.
Further, since the transport path is lengthened in this way, there is a problem that the durability of the transport mechanism is reduced.

As described above, since the residual thread removing position G and the bobbin thread winding position H are separated from each other, for example, a bracket or the like for fixing the drive mechanisms of the residual thread removing device 61X and the bobbin thread winding device 62X, for example. However, there is also a problem in that the number of parts cannot be shared and the cost is increased.

Further, as described above, the residual thread removing position G and the bobbin thread winding position H are respectively arranged at the opposite positions on the moving path (rotation locus) of the bobbin case gripping means by the second moving means. The residual thread removing device 61X and the bobbin thread winding device 62X are arranged corresponding to the positions G and H, respectively. Two devices, the residual thread removing device 61X and the bobbin thread winding device 62X, are provided in the oil pan. There is also a problem in that these devices must be miniaturized and refined in order to fit them in a limited space (especially a space perpendicular to the shuttle shaft), and thus an increase in cost cannot be avoided.

Therefore, according to the present invention, the transport path of the bobbin case is shortened to improve the responsiveness and the durability of the transport mechanism, and further, the residual thread removing position and the bobbin thread winding position are arranged close to each other, for example, a bracket or the like is shared. Automatic bobbin thread that reduces costs by increasing the number of parts to reduce the number of parts and lowering the cost, and also creating a space in the oil pan to eliminate the need for device miniaturization and precision. An object is to provide a supply device.

[0012]

In order to achieve the above object, an automatic bobbin thread feeder according to a first aspect of the present invention has a bobbin case gripping means capable of gripping or releasing a bobbin case accommodating a bobbin, and this bobbin case gripping means. Bobbin exchange provided with first moving means for moving the bobbin case gripping means in a direction parallel to the shuttle shaft of the sewing machine, and second moving means for moving the bobbin case gripping means in a direction coming in and out of a moving path by the first moving means. A bobbin; and a bobbin winding device capable of winding a bobbin from a bobbin by rotating the bobbin. By moving the case holding means by the both moving means, the bobbin case holding means is moved to the hook position, the residual thread removing position for removing the residual thread of the bobbin in the residual thread removing device, the bobbin winding In lower thread automatic supply apparatus movable in bobbin thread winding position, winding the bobbin thread in the device,
The residual thread removing position and the bobbin winding position are arranged in parallel on the moving path of the bobbin case gripping means by the first moving means.

In order to achieve the above object, an automatic bobbin thread feeder according to a second aspect, in addition to the first aspect, arranges a residual thread removing position on the moving path of the bobbin case holding means by the second moving means. It is characterized by having done.

[0014]

According to the automatic bobbin thread feeder of claim 1, the residual thread removing position and the bobbin thread winding position move the bobbin case gripping means in the axial direction parallel to the shuttle shaft of the sewing machine.
A direction in which the bobbin case is arranged side by side on the moving path of the bobbin case gripping means by the moving means, and moves away from the moving path by the first moving means when the bobbin case is conveyed between the residual thread removing position and the bobbin thread winding position. The conveyance by the second moving means for moving the bobbin case holding means is unnecessary, and the conveyance path of the bobbin case is shortened. The residual thread removing position and the bobbin thread winding position are arranged side by side on the moving path of the bobbin case gripping means by the first moving means for moving the bobbin case gripping means in the axial direction parallel to the shuttle shaft of the sewing machine. The yarn removing position and the bobbin winding position can be arranged closer to each other as compared with the prior art. Further, the residual thread removing position and the bobbin thread winding position move the bobbin case gripping means in the axial direction parallel to the shuttle shaft of the sewing machine.
The bobbin case gripping means by the moving means is juxtaposed on the moving path, and the bobbin case winding device and the residual thread removing device are not juxtaposed in the moving direction of the bobbin case by the second moving means. There is room in space.

According to the bobbin exchanging device of the second aspect, the residual thread removing position is arranged on the moving path of the bobbin case holding means by the second moving means, and is conveyed to the residual thread removing position. New transportation by the first moving means is unnecessary.

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, the bobbin thread automatic feeding device of this embodiment includes a bobbin thread winding device 162, a residual thread removing device 161, and a bobbin thread winding position C and a residual thread winding position 162 of the bobbin 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 automatic bobbin thread feeder is provided with a sewing machine bed 10
It is provided in the lower part of 1. . First, FIGS.
The bobbin changing device 160 will be described below with reference to FIG.

In FIGS. 28 to 32, reference numeral 1 is a hook on which the bobbin case 2 is mounted, 1a is a hook shaft, and 3 is a stand 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. 28) is rotatably and slidably supported on the transport shaft 4.

To 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. 28, the plate-shaped portions of the are opposed to each other with the axis 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 rotary gear 13 is fixed to the outer periphery of the transfer block 12, and the rotary gear 13 has a long drive shape along the hook shaft 1a direction 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 projecting to the other end side of the transport shaft, and the other end is directly connected to an output shaft of a rotation motor 20 serving as a second moving unit fixed to a motor fixing plate 21. Has become.

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. 29 to 31). Also,
The transport shaft 4 is cantilevered, but since it is guided by the drive gear 19, its supporting strength is sufficient.

A not-shown 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 is 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 fixed to an output shaft of a moving motor 18 as a first moving unit attached to the base plate 3.

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 mounted on 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 mounted on the sensor fixing plate 33. ing. Further, as shown in FIGS. 28 and 29, the 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. 28 and 30, 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.

A dummy shaft 6 as a bobbin case holding means is provided at a position opposite to the rotation locus of the bobbin case holding means on the base plate 3 and directly below the shuttle 1 as shown in FIG. Is fixed. As shown in FIG. 32, 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 is, as shown in FIGS. 1 and 32,
It is configured to engage with the locking groove of the rotation preventing member 5aa provided in the vicinity of the dummy shaft 6. That is, the bobbin case 2 is positioned and held at a predetermined position.

By the way, the lower thread winding position C and the residual thread removing position B are, as shown in FIG. 1, obliquely below the conveying shaft 4, and the bobbin case by the rotation motor 20 as the second moving means. It is arranged at a position opposite to the rotation locus (movement path) of the gripping means. In particular, the residual thread removing position B is arranged on the rotation locus of the bobbin case holding means, as shown in FIG. Further, the bobbin thread winding position C is a position where the bobbin case gripping means is slightly advanced from the residual thread removing position B (position advanced toward the paper surface in FIG. 1; position on the right side of the residual thread removing position B in FIG. 2). It is in. That is,
The residual thread removing position B and the bobbin thread winding position C are arranged in this order from the side opposite to the shuttle hook on the moving path of the bobbin case holding means by the moving motor 18 as the first moving means.

At the residual yarn removing position B, a residual yarn removing device 161 is arranged. As the residual yarn removing device 161, for example, a device that can automatically draw out the lower yarn wound around the bobbin by driving a motor or the like is adopted. Hereinafter, the residual yarn removing device 161 will be described with reference to FIGS. 1 and 2 and FIGS. 24 to 27.

In FIG. 2, reference numeral 79 indicates a rotating shaft. The rotary shaft 79 penetrates the base plate 3 and
A U-shaped residual thread bracket 80 arranged so as to sandwich the base plate 3 is rotatably wound around both side plates 80a and 80b, and both ends project outward from the side plates 80a and 80b. ing. A drive roller 760 as a rotating body is fixed to a shaft portion protruding from the front side (left side in FIG. 2) side plate 80a of the residual thread bracket 80, and a drive roller 760 is fixed to a shaft portion protruding from the back side (right side in FIG. 2) side plate 80b. The residual thread roller drive pulley 83 is fixed. Also,
A motor bracket 3a is arranged on the inner side of the base plate 3, and a residual yarn motor 86 is fixed to the motor bracket 3a. A residual yarn motor pulley 89 is fixed to the output shaft of the residual yarn motor 86, and a residual yarn belt 84 is stretched between the residual yarn motor pulley 89 and the residual yarn roller driving pulley 83.

Therefore, when the residual thread motor 86 is driven, its rotation is transmitted to the rotary shaft 79 via the residual thread motor pulley 89, the residual thread belt 84, and the residual thread roller drive pulley 83.
The drive roller 760 is adapted to rotate.

A U-shaped rotary arm 85 is arranged between the residual thread bracket 80 and the base plate 3, as shown in FIGS. A rotary shaft 80c is rotatably attached to both side plates 85a and 85b forming a U-shape of the rotary arm 85.
A driven roller 761 as a rotating body is fixed to a shaft portion further projecting from 5a. 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 through the base plate 3 and both side plates 80a, 80b of the residual thread bracket 80.
A rotary arm drive pulley 88 is fixed to a shaft portion that is rotatably attached to the rear side plate 80b and further protrudes to the rear side. Also, the motor bracket 3
A rotary arm motor 92 is fixed to a, and a rotary arm motor pulley 91 is fixed to an output shaft of the rotary arm motor 92. A rotary arm belt 90 is stretched between the rotary arm motor pulley 91 and the rotary arm drive pulley 88.

Therefore, when the rotary arm motor 92 is driven, the rotation thereof is performed via the rotary arm motor pulley 91, the rotary arm belt 90, and the rotary arm drive pulley 88.
7 is transmitted to the rotary arm 8 with the shaft 87 as a fulcrum.
5, the driven roller 761 is rotated. This rotation speed is relatively low (slow speed) (the reason will be described later).

When the rotation arm motor 92 drives and the driven roller 761 rotates about the shaft 87 as a fulcrum, the driven roller 761 faces the driving roller 760, and the driving of the residual thread motor 86 causes the driving roller 760 to rotate. Then,
While winding the lower thread end, the lower thread can be discharged downstream in cooperation with the drive roller 760 (details will be described later).

When the rotary arm motor 92 is driven and the rotary arm 85 and the driven roller 761 rotate about the shaft 87 as a fulcrum, the rotary shaft 8 for fixing the driven roller 761.
In order to prevent 0c from hitting the front side plate 80a of the residual thread bracket 80, a notch or the like is appropriately formed on the side plate 80a.

Further, in the residual thread removing device 161, the bobbin case 2 which is set to the residual thread removing position B by the rotating arm 70 faces the bobbin thread leading portion (bottom thread leading portion of the bobbin thread tension spring). An air nozzle 100 for dropping the yarn, which can blow air by means of air, is provided (see FIG. 24). 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. 24, the bobbin 7 is attached to the rotating arm 70 of the bobbin changing device 160 described above.
An air nozzle 151 for blowing the lower thread end portion M hanging from the bobbin case 2 (specifically, a lower thread tension spring) accommodated therein to a 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 (correctly, the outer peripheral surface on the lower side in the drawing) and flutters downstream (see FIG. 24 (b)). ), And the blowing of the lower thread end portion M to the working position is performed by the air nozzle 151.
This is achieved by blowing the air from the above to the outer peripheral surface of the bobbin case 2 and creating a flow along the outer peripheral surface toward the outer peripheral surface of the drive roller 760. 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.

Further, as shown in FIGS. 1 and 2, for example, a reflection type optical sensor 500 as a rotation detecting means is attached to the front side plate 85a of the rotating arm 85 in the residual yarn removing device 161. . This reflective optical sensor 5
00, the bobbin case 2 is set to the residual thread removing position B according to the rotating arm 70, and the rotating arm motor 9
When the rotary arm 85 rotates according to 2 and the driven roller 761 faces the drive roller 760 (when the residual yarn can be removed), the side surface of the bobbin 7 as shown in FIG.
It is arranged so as to face the reflection hole 7a that is formed at the location. Reference numeral 7b indicates a clutch hole for connecting the bobbin 7 to the clutch mechanism 50a of the lower thread winding device 162 described later.

Therefore, when the bobbin 7 rotates by the residual thread removing operation by the residual thread removing device 161, the reflection type optical sensor 50 is rotated.
From 0, as shown in FIG. 27, continuous pulse waves are output. 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 configured to pull out the lower thread wound around the bobbin 7 and hanging from the bobbin case 2. It is arranged below B (see FIG. 2).

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, a lower thread can be automatically wound around a bobbin by driving a motor, and then thread hooking on the bobbin case 2 and lower thread cutting (thread cutting) are adopted. Has been done. The bobbin winding device 162 will be described below.

The bobbin winding device 162 is equipped with a bobbin drive mechanism E as a bobbin drive means for rotating the bobbin. The bobbin drive mechanism E will be described below. Figure 2
And in FIG. 3, reference numeral 50 indicates a winding shaft,
The winding shaft 50 penetrates the base plate 3 and is rotatably supported by a base bracket (not shown) attached to the back side of the base plate 3. A clutch mechanism 50a capable of clutching a plurality of existing holes (see FIG. 16 and FIG. 26) 7b formed in the bobbin 7 at the front side (left side in FIG. 2) of the winding shaft 50 to the base plate 3 is provided. Pulleys 50b are respectively fixed to the ends on the back side (right side in FIG. 2). A bobbin drive motor M2 is fixed to the motor bracket 3a. A pulley 52 is fixed to the output shaft of the bobbin drive motor M2, and a belt 51 is stretched between the pulley 52 and the pulley 50b.

Therefore, the bobbin case 2 at the remaining yarn removing position B advances to the bobbin winding position C by the forward movement of the rotating arm 70 (the movement toward the shuttle; the movement toward the right side in FIG. 2). When the bobbin drive motor M2 is driven together with the rotation of the winding shaft 50, the clutch mechanism 5
0a and the bobbin 7 are connected. Note that the clutch mechanism is not limited to the structure that engages with the hole as described above, and may have another structure.

Further, the lower thread winding device is a mechanism for removing looseness of the lower thread 150 from the thread winding 200 (see FIG. 6) as a lower thread supply source, entanglement of the lower thread with the bobbin shaft, and a lower thread wound around the bobbin. A mechanism for detecting the yarn amount is provided (these are collectively referred to as symbol F). The mechanism F will be described below.
3 to 5, reference numeral 53 indicates a U-shaped base, and a roller shaft 55 is rotatably wound between both side plates 53a and 53b of the base 53. The end portion of the roller shaft 55 on the side plate 53b side projects outward from the side plate 53b, and the roller 54 around which the bobbin thread 150 from the spool 200 is wound (one turn) is fixed to the end portion. ing.

A sensor slit 58 is fixed to a portion of the roller shaft 55 between both side plates 53a and 53b.
This sensor slit 58, as shown in FIG.
It has a disk shape and is provided with a plurality of grooves on its outer circumference. As shown in FIG. 5, a photosensor 60 is arranged at a position facing the sensor slit 58, and the groove of the sensor slit 58 can be detected. That is, when the roller 54 is rotated by the bobbin winding operation of the bobbin winding device 162, a continuous pulse wave is output from the photo sensor 60 as shown in FIG. It corresponds to the amount of bobbin winding).

The photo sensor 60 has a lower thread 15
An effective lower thread winding amount detecting means 61 for detecting the entanglement of 0 on the bobbin shaft and for detecting the effective lower thread winding amount wound around the bobbin shaft is connected. Further, the effective bobbin winding amount detecting means 61 is connected to a judging means 61B. This determination means 61B is a bobbin thread wound on the bobbin actually set by the set bobbin thread winding amount from the means 61A which can input and set the bobbin thread winding amount connected to the outside and the effective bobbin winding amount detecting means 61. The function of sending a drive stop signal to the bobbin drive motor M2 is compared with the bobbin drive motor M2 when the bobbin winding amount on the bobbin based on the rotation amount of the roller 54 after entanglement with the bobbin shaft is compared. .

The mechanism F also has a loosening mechanism for loosening the lower thread 150. This slack eliminating mechanism is rotatably supported by a roller shaft 55 via a bearing (not shown), and the slack eliminating lever 6 has a bobbin thread 150 passed through a hole.
2, a spring 64 for urging the slack eliminating lever 62 in a direction for slackening the lower thread 150, and a stopper 63 for restricting the rotation of the slack eliminating lever 62 by the urging force of the spring 64.
It consists of and.

Further, downstream of the mechanism F, there is provided an air guide mechanism G as a thread inserting means for guiding the lower thread 150 from the bobbin 200 to the opening 2A of the bobbin case 2 (in this embodiment). Is also used as a bobbin thread entanglement means). The air guide mechanism G will be described below. In FIG. 3, reference numeral 65 indicates a substantially hollow cylindrical yarn suction device,
As shown in FIGS. 3 and 7, the yarn suction device 65 has a suction hole 65a that communicates the internal space with the outside and extends from the upstream side to the downstream side. One end of an air tube 66 communicating with the internal space of the yarn suction device 65 is connected to the upstream side of the yarn suction device 65. An electromagnetic valve 68 is connected to the other end of the air tube 66, and an air source (not shown) is connected to the electromagnetic valve 68. Further, a thread mounting switch (not shown) for turning on / off the solenoid valve 68 is provided.

On the downstream side of the yarn suction device 65, the yarn suction device 6
One end of a rotatable air tube 67 is connected to the yarn suction device 65, which communicates with the internal space of 5. The other end of the air tube 67 is bent into an L shape, and the air nozzle 67a at the tip of the air tube 67 is connected to the opening 2A of the bobbin case 2 in a state where the clutch mechanism 50a and the bobbin 7 are connected. The position is adjusted so as to face. Then, as shown in FIGS. 10 and 11, the air nozzle 67 stopped at the facing position (at the working position).
The bobbin thread winding direction (air blowing direction) is on the bobbin shaft lower thread winding side.

The bobbin shaft lower thread winding side referred to here is
As shown in FIG. 11, one direction of the outer circumference of the bobbin shaft 7a divided into two by a line segment YY connecting the center of the bobbin shaft 7a and the tip of the air nozzle 67a, that is, the side where the bobbin thread 150 is entangled with the bobbin shaft 7a ( The reference numeral XX in the drawing). Further, the lower thread guiding direction of the tip of the air nozzle 67a is
Preferably, the bobbin shaft 7a on the bobbin shaft lower thread winding side XX
It is a direction intersecting with the outer periphery, and particularly preferably a direction in contact with the outer periphery of the bobbin shaft 7a.

The bobbin thread length (LL) drawn out from the air nozzle 67a is set to a length required to entangle the drawn bobbin thread end with the bobbin shaft. And this required length is in the range of {(length from the air nozzle at the working position to reach the outer circumference of the bobbin shaft) + [bobbin shaft full circumference length × (1.1 to 2.0)]}. Preferably
{(Length from the air nozzle at the working position to reach the outer circumference of the bobbin shaft) + [One round bobbin shaft length x (1.25
.About.1.8)]} is more preferable.

If the length is longer than the above range, it becomes difficult for the bobbin thread end to come out from the opening 2A of the bobbin case 2, or even if it enters, the bobbin shaft 7a goes around the bobbin shaft 7a for one or more rounds to form a knot by itself. There is a fear that the bobbin shaft 7a is bound, and if it is shorter than the range of, there is a fear that the lower thread end does not get entangled with the bobbin shaft 7a.

In this embodiment, the required length is 55 mm.
Set to. That is, the distance H between the tip of the air nozzle 67a and the opening 2A of the bobbin case 2 is set to 7 mm, and the length 7 m in contact with the bobbin shaft outer periphery from the bobbin case opening 2A.
m and (bobbin shaft circumference 25 mm × 1.64) = 131 mm.

When the electromagnetic valve 68 is turned on, air is supplied from the air source, and the air is blown from the air nozzle 67a through the air tube 66, the yarn suction device 65, and the air tube 67, and the yarn suction device 65 operates. The lower thread end portion inserted through the suction hole 65a is led out from the air nozzle 67a.

At this time, the distance H (see FIG. 10) between the tip of the air nozzle 67a stopped at the facing position (at the working position) and the opening 2A of the bobbin case 2 is preferably 10 mm or less, Particularly preferably, it is 3 to 7 mm. With this range, fluttering of the lower thread 150 due to blown air can be suppressed, and a vortex flow required for the lower thread 150 to be entangled with the bobbin shaft 7a in the bobbin case 2 can be formed.

By the way, an intermediate portion of the air tube 67 is rotatably supported by the base 501 of the lower thread winding device 162. This air tube 67 has a spring 57.
3, the spring 5 is urged in the clockwise direction in FIG. 3 according to the operation of the nozzle retraction solenoid 69.
It is rotated in a direction against the biasing force of 70. Here, in this embodiment, a latching solenoid is adopted as the nozzle retraction solenoid 69, and an ON signal is given to the nozzle retraction solenoid 69 (see FIG. 8C).
When the air nozzle 67a withdraws from the opening 2A of the bobbin case 2 against the biasing force of the spring 570 and gives an off signal to the nozzle retracting solenoid 69 (see FIG. 8D), the biasing force of the spring 570 causes the air to flow. The nozzle 67a moves to a facing position facing the opening 2A of the bobbin case 2.

When the bobbin case 2 is set at the lower thread winding position C, a bobbin case 2 is provided around the bobbin case 2 with a moving knife with a moving knife which constitutes thread hooking means and cutting means. (See FIGS. 1 and 2, 12 and 13).

As shown in FIG. 13, the thread separating device with a moving knife 116 has a V-shaped notch for introducing the bobbin thread to the front end (front side in FIG. 13) and the rear end (back side in FIG. 13). It has a moving knife plate 116A on which 116C and 116D are respectively formed, and has a V-shaped notch 116
C and 116D are as shown in FIGS.
The apex of the cut portion 116C is formed so as to be displaced to the left side in FIG. 13 with respect to the apex of the cut portion 116D. On the upper surface of the moving knife plate 116A, a cutting eye (moving knife) 116E is formed on a line approximately connecting the apex of the cut portion 116C and the apex of the cut portion 116D, and FIG. 12 and FIG. A thread splitting wing 116 with a small gap for allowing the fixed knife 91 shown in FIG.
B is provided. Both the moving knife plate 116A and the yarn separating blade 116B are curved in an arc shape with the winding shaft 50 as the center (see FIGS. 12 and 13), and the thread separating unit with moving knife 116 surrounds the bobbin case 2. Rotating and fixing knife 9
When the position 1 is reached, the positional relationships are adjusted so that the moving knife 116E on the back of the moving knife plate 116A rubs against the tip of the fixed knife 91.

As shown in FIG. 2, the thread separator with a moving knife 116 is fixed to the outer circumference of a boss 804 rotatably supported on the outer circumference of the winding shaft 50.
A gear 8 is provided on the outer periphery of the base plate 3 of the base plate 04.
02 is fixed. This gear 802 has a gear 801
Gears 801 are engaged with each other, and the gear 801 is a threading drive motor 80 with a moving knife fixed to the motor bracket 3a.
It is fixed to the 0 output shaft. Therefore, when the thread separating drive motor 800 with the moving knife is driven, the thread separating with the moving knife 1
16 is rotated in the forward and reverse directions.

After the lower thread is wound and the thread is hooked (details will be described later), the lower thread tension spring 2 of the bobbin case 2 is wound.
The lower thread length from the lower thread tension spring 2D tip of the lower thread derived from D (see FIG. 20) to the lower thread cutting point S (specifically, the point where the moving knife 116E and the fixed knife 91 rub) is: Length required for stitch formation by entanglement with needle thread, that is, 4
The bobbin case 2 and the fixed knife 9 so that the length is about 0 mm.
1, each arrangement of the lower thread cutting point S, etc. is determined (FIG. 12).
reference).

By the way, the air nozzle 67a can be moved to the working position shown in FIG. 10 and the retracting position shown in FIG. 12 by the nozzle retraction solenoid 69 as described above. It is in the retracted position during bobbin winding, thread hooking and thread cutting.

When the air nozzle 67a is located at the retracted position, the distance between the bobbin thread cutting point S and the tip of the air nozzle 67a at the time of cutting is as shown in FIG. Each of the bobbin case 2, the bobbin thread cutting point S, the retreat position of the air nozzle 67a, etc. is made to substantially match the length LL (about 55 mm in this embodiment) required to entangle the bobbin thread with The placement has been decided.

In addition, above the bobbin case 2 when the bobbin case 2 is set at the bobbin thread winding position C, and below the rotation locus of the thread separating unit with a moving knife 116 shown in FIG.
4, FIG. 15, and FIGS. 17 to 21, the thread hooking lever 124 is rotatably supported by a step screw 124a in a plane orthogonal to the paper surface of FIG. As shown in FIG. 14, the thread hooking lever 124 has a hook 124A at the tip and a hook 124A.
And a slanted surface 124B that is slanted from the upper side to the lower right side in FIG. The thread hooking lever 124 is biased counterclockwise in FIG. 14 by a torsion spring 125, and is normally in the state shown by the solid line in FIG.

Further, FIG. 17 showing the tip of the winding shaft 50 is shown in FIG.
The front side of the wiper 13 is rotatably supported.
0 is set. The wiper 130 is in the shape of a bar with a bent portion, and is rotated by a rotary air cylinder (not shown).

Further, between the mechanism F and the bobbin winder 200, as shown in FIG. 6, a thread tension varying means 204 for varying the tension of the lower thread 150 is provided. The thread tension varying means 204 includes a tension spring 205 for pressing the passing bobbin thread 150, a screw 206 for manually adjusting the pressing force of the tension spring 205, and the sewing machine bed 1.
01 and a solenoid SOL that generates a solenoid thrust force against the pressing force of the tension spring 205.

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

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

When the residual yarn removing device 161 and the bobbin winding device 162 come into contact with the base plate 3 shown in FIGS. 28 to 32, the base plate 3 is appropriately cut.

By the way, in this embodiment, the bobbin case holding means is moved by the moving motor 18 to the bobbin case attaching / detaching positions (hook position; dummy shaft position) A and D and the retracted position (the position opposite to the hook). 29 to 32)). That is, when the bobbin case holding means moves to the retracted position, the sensor plate 15 causes the linear motion sensor 41 to move.
The 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. If it does, it will return 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, dummy position D
In addition, the rotation can be controlled.

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 in which the bobbin has been wound, the hand is inserted from the turning arm side (front side; left side in FIG. 2), 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 thread 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 retracted and rotated to make one of the bobbin case gripping means holding the bobbin case 2X face the shuttle 1 and move 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.

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

If, for example, a bobbin replacement command is issued because the bobbin in the hook has run out of yarn, etc.,
The sewing operation of the sewing machine is prohibited, the bobbin case gripping means that does not grip the bobbin case is advanced, the bobbin case 2X that accommodates the bobbin with less remaining thread is taken out of the hook, and the rotating arm 70 is moved. Retreat.

Next, the rotating arm 70 is rotated to make the bobbin case 2Y containing the bobbin wound bobbin face the hook 1 and move forward to advance the bobbin case 2Y containing the bobbin wound bobbin. Then, the rotary arm 70 is retracted.

When the sewing is started, the rotating arm 70 is rotated during the sewing to rotate the bobbin case 2X containing the bobbin having the reduced residual thread to the residual thread removing position B. Then, the air nozzle 100 for thread dropping
As shown in FIG. 24 (a) and FIG. 25 (a), the twisting thread dropping air is blown intermittently for a predetermined period of time, and the lower thread leading-out portion (lower thread leading-out portion of the lower thread tension spring) of the bobbin case 2X is blown. ), The lower thread is surely hung downward, and this time, the yarn guide air is blown from the air nozzle 151 (Fig. 24).
(B) and FIG. 25 (b)), the lower thread end M hanging from the bobbin case 2X is blown to the working position, and then the rotary arm motor 92 is driven to slowly rotate the driven roller 761 with the shaft 87 as a fulcrum. (See FIG. 24B).

Then, the driven roller 761 becomes the driving roller 7
60, but the lower thread end portion M is connected to the rollers 760 and 761.
Before sandwiching it, the blowing of air by the air nozzle 151 is stopped (see FIGS. 25B and 25C).

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 downstream 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. If the air from the air nozzle 151 is shut off before the lower thread end M is sandwiched between the rollers 760 and 761 by the movement of the roller 761, the lower thread end M that has been blown up is rotated by the driven roller 761. It hangs down on the outer peripheral surface of the
When 1 rotates and the rollers 760 and 761 face each other, the lower thread end portion M is sandwiched between the rollers 760 and 761.

The timing of pinching the lower thread as described above, that is, while the driven roller 761 is being rotated, the driven roller 761 is rotated.
The timing of stopping the air of the air nozzle 151 before the first roller 1 faces the driving roller 760 is very difficult to take when the driven roller 761 is swung quickly by, for example, a solenoid. If so, the motor is set to a low speed (slow speed) so that the timing can be easily adjusted.

Then, when the residual thread motor 86 is driven to rotate the drive roller 760 (see FIG. 25D), the bobbin thread that has been nipped by the cooperation of the rollers 760 and 761 is transferred to the rollers 760 and 761. It is discharged downstream while being caught in (see FIG. 24 (c)), and the residual yarn is removed. Then, the reflection type optical sensor 500 is completed when the residual thread removing operation is completed.
If it is found from the output from, the operation of the residual yarn removing device 161 is stopped.

Then, the bobbin case 2X accommodating the empty bobbin is moved forward to the bobbin thread winding position C without rotating, and the bobbin thread winding device 162 winds the bobbin thread around the empty bobbin. . Next, this bobbin winding device 162
The operation will be described below with reference to FIGS. 3 to 21.

First, the bobbin thread 200 from the thread tension varying means 204 is wound around the roller 54 once, and the bobbin thread wound once is passed through the hole of the loosening lever 62. At this point, the switch SW of the thread tension varying means 204 is turned on to maximize the solenoid thrust to minimize the bobbin thread tension.

Next, the yarn end of the lower yarn 150 is inserted into the suction hole 65a of the yarn suction device 65 and pushed in slightly. Then
Temporarily turn on the solenoid valve 68 and air tubes 66, 67
Air from the air source is flown into the suction hole 65a, and the lower thread 150, which has been pushed into the suction hole 65a, is guided to the air nozzle 67a by the flow of air, and its thread end is exposed from the air nozzle 67a and led out. As described above, the lead-out length LL is a length necessary for entwining the bobbin shaft with the bobbin shaft, and is about 55 mm in this embodiment. When the lower thread 150 that has been inserted and pushed into the suction hole 65a is conveyed from the thread suction device 65 by air and exposed from the air nozzle 67a and led out,
When the operator manually pulls the bobbin thread from the spool 200 by a necessary amount in advance and loosens it, or when the bobbin thread is manually fed out, the bobbin thread can be more favorably conveyed.

Then, while the bobbin case 2X which has reached the lower thread winding position C by the forward movement of the rotating arm 70 is moved slightly forward, the bobbin drive motor M2 is temporarily driven to connect the clutch mechanism 50a and the bobbin 7. .

Then, as shown in FIG. 8B, the bobbin drive motor M2 is driven at a low speed to rotate the bobbin at a low speed. Next, as shown in FIG. 8D, an OFF signal is given to the nozzle retraction solenoid 69 to turn off the air nozzle 67a.
Is directed to a work position near the opening 2A of the bobbin case 2X, and as shown in FIG.
Is turned on to allow air from the air source to flow through the air tubes 66 and 67.

Then, as shown in FIG. 10, the lower thread end portion led out from the air nozzle 67a is properly inserted into the bobbin case 2X from the opening 2A of the bobbin case 2X in a state where fluttering and the like are suppressed ( The bobbin shaft 7a is guided to the bobbin shaft lower thread winding side XX and is entangled with the bobbin shaft 7a by the cooperation of the rotation of the bobbin shaft 7a and the vortex flow formed by air.

In this way, when the bobbin thread 150 from the bobbin 200 is entangled with the bobbin shaft 7a, the roller 54 starts rotating, and the photosensor 60 produces a pulse wave as shown in FIG. 8 (e). Output begins. Then, in the effective bobbin winding amount detecting means 61, when a predetermined number of this pulse wave is counted, it is determined that the bobbin thread 150 is entangled with the bobbin shaft 7a. Here, in the present embodiment, when three pulse waves are detected, the bobbin thread 150 moves the bobbin shaft 7a.
It is decided to be entangled in. The number of pulse waves of three is a value that allows for a safety factor, and is not limited to this number.

When the entanglement of the bobbin thread 150 with the bobbin shaft 7a is detected in this way, the effective bobbin winding amount detecting means 61 counts the subsequent pulse waves as the effective bobbin winding amount. Go. Also, at this time, FIG.
As shown in FIG. 8A, the solenoid valve 68 is turned off to stop the air from the air source, and as shown in FIG. 8C, the nozzle retraction solenoid 6 has a slight time lag.
9 to the air nozzle 67a to turn on the air nozzle 67a.
As shown in FIG.

By the way, when the bobbin thread 150 is not entangled with the bobbin shaft 7a and a pulse wave is not output from the photo sensor 60 as shown in FIG.
As shown in FIG. 9A, the solenoid valve 68 is turned off to stop the air from the air source, and as shown in FIG. 9C, the nozzle retraction solenoid 6 has a slight time lag.
An ON signal is given to 9 to retract the air nozzle 67a to the retracted position and return to the initial state.

Then, as shown in FIG. 9D again, an OFF signal is given to the nozzle retraction solenoid 69 to direct the air nozzle 67a to the working position near the opening 2A of the bobbin case 2, and As shown in FIG. 9 (a), the solenoid valve 68 is turned on to allow air from the air source to flow through the air tubes 66 and 67. That is, the retry operation is performed. In the present embodiment, the retry operation is performed up to three times. If the entanglement of the bobbin thread with the bobbin shaft 7a is not detected even if the retry operation is performed three times, some trouble occurs. When it occurs, an alarm such as an alarm is issued, and an operator can intervene to deal with the defect.

Now, as described above, the lower thread 150
Entanglement with the bobbin shaft 7a is detected and the air nozzle 67a is retracted to the retracted position as shown in FIG. 12, the bobbin drive motor M2 is accelerated from a low speed to a high speed to lower the bobbin thread 7a. It will be wound around. As described above, when the bobbin thread is wound while the distance between the tip of the air nozzle 67a and the bobbin shaft 7a is lengthened, the bobbin thread 150 is wound substantially uniformly over the entire bobbin shaft 7a. Become.

Then, the determining means 61B compares the actual lower thread winding amount detected by the effective lower thread winding amount detecting means 61 with the set lower thread winding amount input from the lower thread winding amount setting means 61A. When both bobbin thread amounts match, a drive stop signal is sent to the driver 61C of the bobbin drive motor M2 to stop the bobbin drive motor M2. That is, the set lower thread winding amount input from the lower thread winding amount setting means 61A is wound around the bobbin shaft 7a.

It should be noted that the bobbin drive motor M2 is decelerated from the high speed to a low speed by a predetermined amount before the set lower thread winding amount, and this low speed drive is continued, and the bobbin drive motor M is set at the set lower thread winding amount.
If 2 is stopped, the set lower thread winding amount can be directly used as the actual lower thread winding amount without overrunning the rotation.

When the bobbin thread 150 is automatically wound around the bobbin 7 in this manner, the switch SW of the thread tension varying means 204 is turned off to eliminate the solenoid thrust and maximize the bobbin thread tension. Then, the bobbin case 2 is hooked on the bobbin case 2 with the lower thread 150 drawn out from the opening 2A of the bobbin case 2X. This thread hooking operation will be described below.

First, the thread separator 116 with a moving knife is shown in FIG.
A half rotation is made from the initial position shown in FIG. Then, the opening 2A of the bobbin case 2X
A bobbin thread 150 (see FIG. 16) drawn out from is caught at the apex of the V-shaped notch 116D and moves toward the bobbin case 2 thread hooking position 2B on the bobbin thread tension spring side (FIG. 18). reference)

At this time, the bobbin thread moving toward the thread hooking position 2B contacts the inclined surface 124B of the thread hook lever 124 and pushes the thread hook lever 124 in the traveling direction. As described above, since the torsion spring 125 is biased in the direction opposite to the traveling direction,
As shown in, the lower thread 150 is guided to the slit 2C at the thread hooking position 2B after the thread hooking lever 124 is pushed by a predetermined amount in the traveling direction. After that, the thread separator with a moving knife 116 is rotated half a turn in reverse, and the thread separator with a moving knife 11
6 is returned to its original position (see FIG. 19).

Then, the wiper 130 is rotated about 180 ° from the initial position, as shown in FIG. Then, the thread portion led out from the slit 2C is
The lower thread portion hooked by 30 and entering the slit 2C is guided under the lower thread tension spring 2D and led out from the lead-out hole 2E. Then, the wiper 130 is returned to the initial position.

In the bobbin case 2 used in this embodiment, as shown in FIG. 16, the thread 150 drawn out from the opening 2A is provided with the thread hooking position 2B on the lower thread tension spring side of the bobbin case 2. Chamfer 2 to make it easier to move to
Although "a" is applied, there is no change in the sewing quality due to the chamfer 2a. In addition, the thread 15 drawn out from the opening 2A
This chamfer 2a may be omitted if 0 moves well to the thread hooking position 2B.

When the thread hooking operation on the bobbin case 2X is automatically performed in this manner, then the bobbin thread supplied to the thread hooked bobbin case 2X is cut. First, the switch SW of the thread tension varying means 204 is turned on to maximize the solenoid thrust to minimize the bobbin thread tension.

Next, the thread separator 116 with a moving knife is shown in FIG.
Rotate in the opposite direction to. Then, as shown in FIG. 21, the lower thread 150 led out from the lead-out hole 2E below the lower thread tension spring 2D of the bobbin case 2X is caught at the apex of the V-shaped notch 116C, and the thread is pulled out. .

The drawn thread is caught at the apex of the V-shaped notch 116C, and the thread separating blade 116
It is sorted to the right side in FIG. 21 by B.

Then, the thread separator with a moving knife 116 is further rotated in the same direction. Then, the thread separator with the moving knife 116
The moving knife 116E and the fixed knife 91 face each other, and the lower thread 150 between them is cut (see FIGS. 12 and 21).

That is, as described above, the bobbin case 2 side bobbin thread is pulled out from the bobbin thread tension spring by a length required for seam formation by entanglement with the top thread, that is, about 40 mm.

The bobbin thread on the bobbin winding 200 side has a length L required to entangle the bobbin thread with the bobbin shaft 7a as described above.
L, that is, about 55 mm is led out from the tip of the air nozzle 67a and cut. Therefore, when the bobbin thread is wound around the bobbin case 2 at the next time (of course, after the next time)
Similarly to the above, the bobbin drive motor M2 is driven at a low speed to rotate the bobbin at a low speed, the air nozzle 67a is moved to the working position, the solenoid valve 68 is turned on, and the air tubes 66 and 67 are supplied with air from the air source. If the bobbin shaft 7a is made to flow, the bobbin shaft 7a can be entangled with the bobbin thread drawn from the tip of the air nozzle 67a by the cooperation of the rotation of the bobbin shaft 7a and the vortex flow formed by the air.

When the bobbin thread cutting operation is automatically performed in this way, the rotary arm 70 is retracted to the retracted position to be in the standby state, and when the next bobbin replacement command is issued, the sewing operation of the sewing machine is started. Forbidden, the rotating arm 70 is rotated so that the bobbin case gripping means not gripping the bobbin case faces the shuttle 1 and is moved forward to move the bobbin case 2Y containing the bobbin with less residual thread inside the shuttle. And the rotating arm 70 is retracted.

Then, the rotating arm 70 is rotated and moved forward, and the bobbin case 2X containing the bobbin wound with the lower thread by the lower thread winding device 162 is mounted in the shuttle. Retreat. After that, the above operation is repeated.

By the way, when the bobbin case 2 (2X, 2Y) held by the bobbin case holding means is taken out or the bobbin case 2 of different colors is used,
In the case of temporarily holding the bobbin case 2 on the dummy shaft 6, the bobbin case holding means holding the bobbin case 2 is opposed to the dummy shaft 6 and is moved forward to be held by the bobbin case holding means. The bobbin case 2 that has been used can be transferred to the dummy shaft 6.

When the bobbin case 2 held by the dummy shaft 6 is taken out, the palm is returned by inserting the hand from the rotating arm side, as in the case of taking out the bobbin case 2 from the inner hook shaft 5. Instead, the bobbin case held on the dummy shaft 6 can be taken out. It is very easy to take out the bobbin case from the dummy shaft 6 by this manual work.

As described above, in this embodiment, the moving motor (first movement) for moving the residual thread removing position B and the bobbin thread winding position C in the axial direction parallel to the shuttle shaft 1a of the sewing machine. Means) 18 are arranged in parallel on the moving path of the bobbin case gripping means, and when the bobbin case 2 is conveyed between the residual thread removing position B and the bobbin thread winding position C, the bobbin case 2 is connected from the moving path by the moving motor 18. Rotation motor (second moving means) 20 for moving the bobbin case gripping means in the separating direction 20
Since the carriage is not required and the carriage path of the bobbin case 2 is shortened, the responsiveness and the durability of the carriage mechanism can be improved.

The residual thread removing position B and the bobbin thread winding position C
Are arranged in parallel on the moving path of the bobbin case gripping means by the moving motor 18, and the residual thread removing position B and the bobbin thread winding position C can be arranged closer to each other than in the prior art. Motor bracket 3a for fixing the drive mechanism etc.
It is possible to reduce the cost by reducing the number of parts by increasing the number of common parts such as.

The residual thread removing position B and the bobbin thread winding position C
Are arranged side by side on the moving path of the bobbin case gripping means by the moving motor 18, and the bobbin case 2 by the turning motor 20.
Bobbin winding device 162 and residual yarn removing device 161 in the moving direction of
Since it is configured such that a space is provided in the oil pan in that direction without arranging them side by side, it is not necessary to downsize the bobbin thread winding device 162 and the residual yarn removing device 161 and to reduce the cost. It is possible to achieve this.

Furthermore, in this embodiment, the residual thread removing position B is arranged on the moving path of the bobbin case gripping means by the rotary motor 20, and the moving motor 18 is used when carrying to the residual thread removing position B. Since the new transport is unnecessary, the transport path of the bobbin case 2 can be further shortened, and the responsiveness and the durability of the transport mechanism can be further improved.

FIG. 33 is a perspective view of an automatic bobbin thread feeder of another embodiment of the present invention, and FIG. 34 is a perspective view of the automatic bobbin thread feeder of FIG. 33 as seen from the back side. The same reference numerals are attached to the same components.

In this embodiment, the bobbin case gripping means (not shown) similar to the above embodiment is used as the gripping unit 14.
No. 0 is provided, and the grip unit 140 is guided by a front-back slide mechanism 141 fixed on the transport base 142 so as to be movable in an axial direction parallel to the shuttle shaft 1a. A rack 143 extending along an axial direction parallel to the shuttle shaft 1a is fixed to the grip unit 140. A pinion 144 is meshed with the rack 143, and the pinion 144 is fixed to an output shaft of a front-rear motor 145 serving as a first moving unit fixed on the transport base 142.

The transfer base 142 is vertically movably guided by a vertical slide mechanism 146 provided upright on the main base, and a rack 147 extending in the vertical direction is fixed to the transfer base 142. ing. A pinion 148 is meshed with the rack 147, and the pinion 148 is fixed to the output shaft of a vertical motor 149 as a second moving unit fixed to the motor bracket 3a.

Further, the residual thread removing position B of the residual thread removing device 161 and the lower thread winding position C of the lower thread winding device 162 are shown in FIG.
As shown in FIG. 3, it is arranged below the shuttle 1 and at a position opposite to the moving path of the bobbin case gripping means by the vertical motor (second moving means) 149. Particularly, the residual thread removing position B is arranged on the moving path of the bobbin case gripping means. Further, the bobbin thread winding position C is a position where the bobbin case gripping means is slightly advanced from the residual thread removing position B (FIG. 34).
The position on the left side of the residual thread removing position B in FIG. That is, the residual thread removing position B and the bobbin thread winding position C are arranged in this order on the moving path of the bobbin case gripping means by the front and rear motor (first moving means) 145 from the side opposite to the shuttle hook.

Further, the dummy shaft 6 is arranged below the lower thread winding position C, and just below the dummy shaft 6, another dummy shaft 6 is arranged.

Therefore, when the vertical motor 149 is driven,
The bobbin case gripping means linearly moves in the vertical direction, and the bobbin case gripping means moves the bobbin case mounting / removing position A in the hook 1, the bobbin thread winding position C, the residual thread removing position B, and the bobbin case mounting / removing position D in the dummy shaft 6 ( The upper side) and the bobbin case attaching / detaching position D (lower side) on the dummy shaft 6 can be appropriately opposed.

When the front / rear motor 145 is driven, the bobbin case gripping means linearly moves in the axial direction parallel to the shuttle shaft, and the bobbin case gripping means is moved to the respective positions A, B, and
It is possible to move forward and backward with respect to C, D (upper side) and D (lower side).

As described above, in this embodiment, the bobbin case attaching / detaching position A, the bobbin thread winding position C, the residual thread removing position B, the bobbin case attaching / detaching position D (upper side) of the dummy shaft 6, and the dummy shaft 6 are used in this embodiment. The bobbin case attachment / detachment position D (lower side) is provided not at the rotation locus of the bobbin case gripping means but at the position opposite to the linear movement locus by the vertical motor 149. Since the position C is still provided in parallel on the moving path of the bobbin case holding means by the first moving means (front and rear motor) 145, the same effect as that of the previous embodiment can be obtained. Needless to say.

Incidentally, in this embodiment, two dummy shafts 6 are provided, but when the bobbin case gripping means is one as in this embodiment, for example, the bobbin thread has already been wound. A dummy shaft for mounting the bobbin case 2X containing the bobbin, and another dummy shaft for temporarily mounting the bobbin case 2Y taken out of the shuttle to replace the bobbin case 2Y taken out of the shuttle with the bobbin case 2X. And are needed.

Although the invention made by the present inventor has been specifically described based on the embodiments, the invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say, for example, in the above embodiment, the residual thread removing position B is arranged on the moving path of the bobbin case holding means by the second moving means 20 and 149, and the conveyance to the residual thread removing position B is performed. At this time, the new moving by the first moving means 18, 145 is completely unnecessary and the carrying time is minimized. However, the remaining yarn removing position B and the bobbin winding position C are set to the first moving means 18, 145. If the residual thread removing position B is not on the moving path of the bobbin case gripping means by the second moving means 20, 149, the effect of the present invention is hindered if the bobbin case gripping means is arranged in parallel on the moving path of the bobbin case gripping means. thing No.

Further, in the above embodiment, the bobbin case holding means is moved to the hook shaft 1a by the first moving means 18 and 145.
By moving the bobbin case holding means from the residual thread removing position B to the bobbin thread winding position C by moving the bobbin case holding means in parallel with the bobbin case gripping means, the bobbin thread winding operation by the bobbin thread winding device 162 becomes possible. For example, the bobbin winding device 16
2 is provided with an actuator capable of moving in parallel to the shuttle shaft 1a, and the entire bobbin thread winding device 162 is moved by this actuator to move the bobbin thread winding position C to the residual thread removing position B. It is also possible that the bobbin winding operation is performed by the moved bobbin winding device 162 without moving a certain bobbin case.

Furthermore, in the above embodiment, the residual thread removing position B and the bobbin thread winding position C are set to the first moving means 18, 1.
The bobbin case gripping means 45 is arranged side by side in this order on the moving path of the bobbin case gripping means from the side opposite to the shuttle. For example, by changing the configuration of the bobbin thread winding device 162 of the above-described embodiment, the residual thread removing position B The lower thread winding position C is set to the first moving means 18, 14
It is also possible to arrange the bobbin case gripping means 5 in parallel on the moving path of the bobbin case gripping means in the order reverse to the above, that is, the lower thread winding position C and the residual thread removing position B.

[0127]

As described above, according to the bobbin thread automatic feeder of claim 1, the bobbin case gripping means is arranged in the axial direction parallel to the shuttle shaft of the sewing machine so as to set the residual thread removing position and the bobbin thread winding position. When the bobbin case is arranged in parallel on the moving path of the bobbin case gripping means by the first moving means to be moved and the bobbin case is conveyed between the residual thread removing position and the bobbin thread winding position, from the moving path by the first moving means. Since the second moving means for moving the bobbin case gripping means in the contacting / separating direction is not required and the bobbin case carrying path is shortened, the responsiveness and the durability of the carrying mechanism are improved. Is possible. Further, the residual thread removing position and the bobbin thread winding position are arranged side by side on the moving path of the bobbin case gripping means by the first moving means for moving the bobbin case gripping means in the axial direction parallel to the shuttle shaft of the sewing machine. Since the yarn removal position and the bobbin winding position can be arranged closer to each other as compared with the conventional technique, for example, the number of shared parts such as a bracket for fixing the drive mechanism and the like is increased and the number of parts is reduced, which is low. It is possible to reduce costs. Further, the residual thread removing position and the bobbin thread winding position are arranged side by side on the moving path of the bobbin case gripping means by the first moving means for moving the bobbin case gripping means in the axial direction parallel to the shuttle shaft of the sewing machine. (2) Since the lower thread winding device and the residual thread removing device are not arranged in parallel in the moving direction of the bobbin case by the two moving means, the lower thread winding device is configured to allow a space in the direction in the oil pan. Since it is not necessary to downsize and refine the device and the residual yarn removing device, the cost can be reduced.

Further, according to the bobbin thread automatic feeder of claim 2, in addition to claim 1, the residual thread removing position is arranged on the moving path of the bobbin case holding means by the second moving means to remove the residual thread. In addition to the effect of claim 1, it is possible to further shorten the transfer path of the bobbin case because the new transfer by the first moving / moving means is unnecessary at the time of transfer to the position. It is possible to further improve the durability of the transport mechanism.

[Brief description of drawings]

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

FIG. 2 is a right side view of the same upper and lower yarn automatic feeder.

FIG. 3 is a schematic perspective view showing a configuration of a lower thread winding device used in the same upper and lower thread automatic feeding device.

FIG. 4 is a side view of a mechanism for detecting both entanglement and bobbin thread winding amount of FIG. 3 and a slack eliminating mechanism.

FIG. 5 is a front view showing the mechanism of FIG. 4 together with a control block.

FIG. 6 is a front view of the thread tension varying means applied to the embodiment.

7 is a cross-sectional view of the lower thread suction device of FIG.

FIG. 8 is a timing chart for explaining the operation of the same upper and lower thread winding device.

FIG. 9 is a timing chart for explaining a retry operation of the upper and lower yarn winding device.

FIG. 10 is an explanatory view showing a positional relationship with respect to the bobbin case and the bobbin shaft when the lower thread of the air guide means is entangled.

FIG. 11 is a view for explaining the bobbin shaft on which the lower thread is wound.

FIG. 12 is an explanatory diagram showing the positional relationship between the air guide means and the bobbin case when the lower thread of the tip of the air guide means is cut.

FIG. 13 is a perspective view of a thread separator with a moving knife attached to the same upper and lower thread winding device.

FIG. 14 is a plan view of a thread hooking lever attached to the same upper and lower thread winding device.

15 is a cross-sectional view of FIG.

FIG. 16 is a perspective view of a bobbin case adopted in the embodiment.

FIG. 17 is a side view of an essential part of the lower thread winding device, showing a state in which the lower thread is wound by the upper and lower thread winding device.

FIG. 18 is a plan view of an essential part of the lower thread winding device, which illustrates a lower thread guiding operation to the slit of the bobbin case.

19 is a plan view of an essential part of the lower thread winding device, which shows a lower thread guiding operation subsequent to the lower thread guiding operation to the slit in FIG.

FIG. 20 is a side view of the main part of the bobbin thread winding device showing the bobbin thread hooking operation under the bobbin thread tension spring.

FIG. 21 is a side view of the main part of the lower thread winding device, which illustrates the lower thread cutting operation.

22 is a side view of the roller rotation detecting means of FIG. 3. FIG.

FIG. 23 is a waveform diagram detected when the above roller rotates.

FIG. 24 is a front explanatory view showing only the main part of FIG. 1 for explaining the operation of the residual yarn removing device adopted in the same upper and lower yarn automatic feeders.

FIG. 25 is a timing chart for explaining the operation of the above residual thread removing device.

FIG. 26 is a front view of the bobbin used in the present embodiment on the side of rotation detecting means.

FIG. 27 is a waveform chart detected when the bobbin rotates.

FIG. 28 is a front view of a bobbin changing device used in the same upper and lower yarn automatic feeding device.

FIG. 29 is a plan view of the above bobbin changing device.

FIG. 30 is a right side view showing a direct-acting mechanism portion of the above bobbin changing device.

FIG. 31 is a right side view showing a rotating mechanism portion of the above bobbin changing device.

FIG. 32 is a schematic side view for explaining dummy positions and dummy shafts of the bobbin changing device of the above.

FIG. 33 is a perspective view of an automatic bobbin thread feeder according to another embodiment of the present invention.

34 is a perspective view of the lower thread automatic feeder shown in FIG. 33 as viewed from the back side.

FIG. 35 is a schematic perspective view of a lower thread automatic feeder according to a conventional technique.

[Explanation of symbols]

 1a shuttle shaft 2,2X, 2Y bobbin case 7 bobbin 18,145 first moving means 20,149 second moving means 150 bobbin thread 160 bobbin exchanging device 161 residual thread removing device 162 bobbin thread winding device 200 bobbin thread supply source A hook Position B Remaining thread removal position C Lower thread winding position

Claims (2)

[Claims] 1. A bobbin case gripping means capable of gripping or releasing a bobbin case accommodating a bobbin, a first moving means for moving the bobbin case gripping means in an axial direction parallel to a shuttle shaft of a sewing machine, and the bobbin case gripping means. A bobbin exchanging device that includes a second moving unit that moves the bobbin in a direction toward and away from a moving path of the first moving unit, a residual yarn removing device that removes a residual yarn of the bobbin, and a lower yarn from a lower yarn supply source. A bobbin winding device capable of winding a yarn around a bobbin by rotating the bobbin, and moving the bobbin case gripping means by the moving means to move the bobbin case gripping means to the hook position,
In the automatic bobbin thread feeder which is movable to a residual thread removing position for removing the residual thread of the bobbin in the residual thread removing device and a bobbin thread winding position for winding the bobbin thread in the bobbin winding device, An automatic bobbin thread supplying device characterized in that the residual thread removing position and the bobbin thread winding position are arranged in parallel on the moving path of the bobbin case gripping means by the moving means. 2. The automatic bobbin thread supplying device according to claim 1, wherein a residual thread removing position is arranged on a moving path of the bobbin case holding means by the second moving means.