JPH08870A - Automatic lower thread supplying device - Google Patents

Abstract

PURPOSE:To automatically perform the work of lower thread winding, remaining thread removal and bobbin case exchange regardlessly of a spatial limitation that a shuttle part is narrow. CONSTITUTION:This device is equipped with a shuttle 16, lower thread winding device 3 and remaining thread removing device 2 and provided with an exchange device 21 composed of a clamping means for attaching and detaching bobbin cases 8a and 8b, rotating means 21B for rotating the clamping means with one rod 22 arranged parallelly to a shuttle rod as a center, first moving means 21C for moving the clamping means along one rod 22, and second moving means 21D for moving the rotating means 21B and the first moving means 21C to a position X, for which one part of the rotating locus of the bobbin case clamping means is positioned inside a sewing machine at least, and a position Y for which one part of the rotating locus is positioned outside the sewing machine. Then, the devices 2 and 3 are arranged outside a bed 11a and by driving the respective means 21A-21D, the bobbin cases 8a and 8b can be moved to a lower thread winding position C, remaining thread removing position B and bobbin attachingdetaching position A.

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 for a sewing machine.

[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.

[0003]

However, the manual operation of winding the bobbin around the bobbin and the replacement operation of the bobbin case are extremely inefficient and cause a decrease in productivity.

Therefore, the present applicant has attempted to solve the above problems in the bobbin thread feeder of the sewing machine described in Japanese Patent Application Laid-Open No. 5-192476, which has been previously filed. Japanese Patent Application No. 5-203612 proposes a device that can automatically remove residual yarn.

FIG. 9 shows the basic construction of the above automatic bobbin thread feeder. This automatic bobbin thread supplying device is arranged in a space where the bottom of the sewing machine bed is an oil reservoir, and the bobbin case attaching / detaching position A, the residual thread removing position B, and the bobbin thread winding position C are arranged on the guide shaft 4. The bobbin case attachment / detachment position A and the other work position B,
C is divided into both ends of the guide shaft 4. The shuttle 16 is wound at the bobbin case attaching / detaching position A, the residual thread removing device 2 for removing the residual thread of the bobbin 7 is wound at the residual thread removing position B, and the lower thread is wound around the bobbin 7 at the lower thread winding position C. Lower thread winding device 3
Are provided, respectively.

The guide shaft 4 is rotatably supported by the main base, and the guide shaft 4 has a rotating arm 5 slidable along the guide shaft 4 and rotatable with the guide shaft 4. It is supported. The forward / backward movement of the rotary arm 5 along the guide shaft 4 is performed by the forward / backward movement lever 6, and the forward or reverse rotation operation is performed in 60 ° units by a driving device (not shown). The rotating arm 5 extends from the center to both sides symmetrically with a slight bending, and a bobbin case 8 containing a bobbin 7 is detachably supported near each end. And hold the bobbin case 8
An openable bobbin case gripping means and a bobbin exchanging device 1 by means of a rotating arm 5 which rotates the bobbin case gripping means with the guide shaft 4 as a fulcrum and is slidable in the axial direction.
Is configured.

Next, the operation of the apparatus thus constructed will be described. First, the bobbin case 8 is not held at one end of the rotating arm 5, and the bobbin case 8 with the bobbin 7 in which the lower thread is wound by the lower thread winding device 3 is held at the other end, and the bobbin case 8 is held. From the state in which one end which is not performing is waiting at a position D (see FIG. 10) between A and C, the rotating arm 5 is rotated 60 ° counterclockwise in FIG. Bobbin case attaching / detaching position A
The bobbin case 8 with a built-in bobbin with residual thread is held at one end of the rotating arm 5 from the shuttle 16 in FIG.

Then, the bobbin changing device 1 is used to move the hook 1
The bobbin 7 in which the bobbin thread has been wound is installed in the bobbin 6. That is,
The rotating arm 5 is retracted to the retracted position of the guide shaft 4, rotated by 180 °, and moved forward to move the bobbin case 8 with the bobbin already wound and held at the other end of the rotatable arm 5 to the bobbin case attaching / detaching position. It is attached to the shuttle 16 of A and the rotating arm 5 is retracted.

Then, the rotary arm 5 is moved clockwise by 6
The bobbin case 8 with a bobbin with residual thread held at one end of the rotary arm 5 is advanced to the residual thread removal position B by rotating it by 0 °, and the residual thread removal device 2 there removes the residual thread of the bobbin 7. The bobbin 7 is removed and becomes an empty bobbin with no thread. After that, rotate the rotating arm 5 120 ° counterclockwise,
When the bobbin case 8 having the empty bobbin from which the residual yarn has been removed is advanced, the bobbin case 8 advances to the lower thread winding position C, and the lower thread winding device 3 winds the lower thread around the empty bobbin.

As described above, in the above-mentioned automatic bobbin thread feeder, the operation of winding the bobbin thread around the bobbin 7, the operation of removing the residual thread, and the operation of exchanging the bobbin case 8 are automatically performed. Therefore, work efficiency and productivity are improved.

However, even the above automatic bobbin thread feeder has the following problems. That is, in the above apparatus, since the bobbin case 8 is moved by the rotation of the rotating arm 5, a large space is required around the shuttle 16 and, for example, the shuttle section as shown in FIG. 11 is wide. There is no problem when applied to the sewing machine 10, but FIG.
For the sewing machine 11 having a cylinder-shaped bed as shown in 2 and the like, there is a space constraint that the hook portion is narrow, and therefore the device cannot be applied.

Therefore, according to the present invention, the bobbin thread is automatically supplied to the bobbin so that the bobbin winding operation, the residual thread removing operation, and the bobbin case exchanging operation can be automatically performed regardless of the space limitation that the hook portion is narrow. A first object is to provide a device.

In addition to the above first object, the present invention has a second object to provide an automatic bobbin thread feeder which is applicable to a two-needle facing hook sewing machine having a pair of facing hooks. To do.

[0014]

In order to achieve the above first object, an automatic bobbin thread feeder according to a first aspect of the present invention is a bobbin case having a bobbin accommodated therein, and a bobbin thread to the bobbin. A bobbin case gripping means for detaching the bobbin case, and a bobbin case gripping means for removing the residual thread of the bobbin. The bobbin case gripping means includes rotating means for rotating about one axis provided, first moving means for moving the bobbin case gripping means along the one axis, the rotating means and the first moving means. A bobbin exchanging device including a second moving unit that moves at least a part of the rotation locus of the sewing machine to a position inside the sewing machine and a position outside the sewing machine, and the bobbin thread winding device and the residual yarn removing device are provided. The device Together arranged outside the Nbeddo,
By driving each means of the bobbin exchanging device, the bobbin case is wound around a bobbin in the bobbin winding device, a bobbin winding position and a residual yarn of the bobbin in the residual yarn removing device are removed. It is movable to the removing position and the bobbin attaching / detaching position for attaching / detaching the bobbin to / from the hook.

In order to achieve the above first object, the automatic bobbin thread feeder of claim 2 is the same as that of claim 1, but the second moving means has the rotating means and the first moving means as one axis. The bobbin case gripping means is rotated about another axis arranged in parallel, and the bobbin case gripping means is positioned at a position where at least a part of the rotation trajectory of the bobbin case gripping means is located inside the sewing machine and outside the sewing machine. It is characterized in that it is a rotating means for moving it to the position to be turned.

In order to achieve the above-mentioned second object, the bobbin thread automatic feeder of claim 3 is the same as that of claim 1, but the hook is a pair of opposed hooks, and the bobbin case gripping means is one of the hooks. It comprises one bobbin case gripping means capable of facing the shuttle and another bobbin case gripping means capable of facing the other shuttle.

[0017]

According to the automatic bobbin thread feeder of the first or second aspect, the bobbin thread winding device and the residual thread removing device are arranged outside the sewing machine bed, and the bobbin case is the bobbin exchanging device. By driving each means, the lower yarn winding position, the residual yarn removing position, and the bobbin attaching / detaching position are moved.

According to the bobbin thread automatic feeder of the second aspect, in addition to the operation of the first aspect, when the bobbin case is attached to and detached from one of the hooks, one bobbin which can face the one hook is provided. The case holding means is used, and when the bobbin case is attached to or detached from the other hook, another bobbin case holding means that can face the other hook is used.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described in detail below with reference to FIGS. The bobbin thread automatic feeder of the first embodiment is applied to the sewing machine 11 shown in FIG. 12, and the front side of the cylinder bed 11a in FIG. 12 of the sewing machine 11 (the S side in FIG. 12 is the operator side, It is arranged on the right side when viewed from the person.

Reference numeral 20 indicates a base plate,
The base plate 20 is provided with a standing portion 20A. The standing portion 20A includes a residual thread removing device 2 for removing the residual thread of the bobbin 7 and a bobbin winding device 3 for winding the bobbin around the bobbin 7 as described in the prior art (shown in FIG. 9). Each is installed.

The bobbin winding device 3 automatically moves the bobbin 7 at the bobbin winding position C by, for example, driving a motor.
Any type of bobbin can be used as long as the bobbin can be wound. For example, Japanese Patent Application Laid-Open No. 5-192476, Japanese Patent Application No. 12
1960 Specification of bobbin exchanging device for sewing machine and Japanese Patent Application No. 5
Appropriate ones can be adopted, including the bobbin winding device described in the bobbin changing device of the sewing machine of the specification No. 116363.

The residual thread removing device 2 has, at the residual thread removing position B, a pinching member capable of pinching or releasing the tip of the thread wound on the bobbin, for example, and is rotated about one axis to be held by the pinching member. As long as it can automatically wind the pinched bobbin thread, it may be of any type,
For example, Japanese Patent Application No. 5-203610 filed by the applicant earlier
Appropriate ones can be adopted including the bobbin residual yarn removing device described in Japanese Patent Application No. 6-40351.

The bobbin changing device 21 includes a bobbin case 8
(In FIG. 2, for convenience of explanation, reference numerals are 8a and 8b).
21A 'and this bobbin case gripping mechanism 21A, 21
A'is a guide shaft 2 that is arranged in parallel with the shuttle shaft.
Rotating means 21B for rotating about 2; first moving means 21C for moving the bobbin case gripping mechanisms 21A, 21A 'along the guide shaft 22; and rotating means 21B and the first moving means 21C for the guide shaft 22. And a rotating means 21D as a second moving means for rotating about a fulcrum pin 23 as the other axis arranged in parallel therewith.

The rotating means 21D is the base plate 20.
Further, a fulcrum pin 23 arranged parallel to the shuttle shaft is provided, and a long flat plate-shaped lower frame 25a is rotatably supported on the fulcrum pin 23. One end of a middle frame 25b is vertically connected to a substantially central portion of the lower frame 25a, and an upper frame 25c is vertically connected to the other end of the middle frame 25b. The fulcrum pin 23 on the lower frame 25a
A cylinder rod tip portion 26a of an air cylinder 26, whose main body portion is pivotally attached to the standing portion 20A, is pivotally attached between and the connecting portion of the middle frame 25b. The rotating means 21D is configured as described above. Therefore, when the air cylinder 26 is driven, the frames 25a, 25b,
25c rotates around the fulcrum pin 23 as a fulcrum.

The rotating means 21B includes the lower frame 25.
bearing 27a provided on the upper end of a and the upper frame 25
A guide shaft 22 is rotatably supported by a bearing 27c provided at the upper end of c. This guide shaft 22
Are arranged parallel to the shuttle shaft and have a non-circular cross section. The guide shaft 22 is fitted with a central portion of an elongated flat plate-shaped rotary arm 24 and a boss 24a continuously provided at an end portion of the central portion. The shape of the holes of the central portion and the boss 24a is the same as the non-circular shape (actually, it is slightly wider).
The boss 24a is rotatable with the guide shaft 22 and is slidable in the axial direction. Color 28 on the boss 24a
Are rotatably fitted together, and axial movement is restricted by a snap ring or the like. That is, color 2
8 is slidable in the axial direction together with the rotating arm 24 and the boss 24a, but is prevented from rotating together with the rotating arm 24 and the boss 24a. Also, color 28
A pin 30 protruding outward is provided on the outer peripheral surface of the. A sprocket 29 is fixed to the right end portion of the guide shaft 22 in FIG. On the other hand, a motor 33 is fixed to the lower frame 25a.
A sprocket 32 is fixed to the output shaft of 3, and a timing belt 31 is stretched around the sprocket 32 and the sprocket 29. The rotating means 21B is configured as described above, and therefore, when the motor 33 is driven, the rotating arm 24 and the boss 24a are rotated (the collar 28 is not rotating).

Bobbin case gripping mechanism 21A, 21A '
The bobbin case 8 can be attached to and detached from the bobbin case 8 as appropriate, and are provided at both ends of the rotary arm 24. Regarding the bobbin case gripping mechanisms 21A and 21A ',
For example, a pair of electromagnet attracting heads described in Japanese Patent Application Laid-Open No. 5-192476, automatic bobbin thread feeder, and bobbin exchanging device of sewing machine in Japanese Patent Application No. 5-121960 filed by the applicant of the present application are included. For example, a suitable one such as a lever claw described in the bobbin exchanging device of the sewing machine in the specification of Japanese Patent Application No. 5-116363 previously filed by the present applicant can be adopted.

The first moving means 21C is provided with an elongated flat plate-shaped forward / backward lever 35 rotatably supported by a pin 34 on the side surface of the middle frame 25b. At the upper end of the forward / backward movement lever 35, a long hole 3 is formed along the vertical direction.
5c is formed, and the pin 30 protruding from the collar 28 is loosely fitted and arranged in the elongated hole 35c. A protrusion portion 35 a that protrudes rightward in FIG. 1 is formed at a substantially central portion of the forward-reverse lever 35.
A long hole 35b is formed in a along the vertical direction.
On the other hand, an air cylinder 36 is attached to the lower frame 25a.
The body part of is fixed and the cylinder rod tip 3
6a is provided with a pin 36b protruding therefrom.
Is loosely fitted in the slot 35b. As described above, the first moving means 21C is configured, and therefore, when the air cylinder 36 is driven, the forward / backward movement lever 35 moves the pin 3 to the pin 3.
4, the collar 28, the boss 24a, and the rotating arm 24 move along the guide shaft 22.

By driving the air cylinder 26 of the rotating means 21D, the bobbin case holding mechanisms 21A, 21 are driven.
As shown in FIG. 2, at least part of the rotation loci of the bobbin case gripping mechanisms 21A and 21A ′ (or the rotation locus of the bobbin case 8) is located inside the sewing machine (inside the cylinder bed 11a). It can move to a position X and a position Y located outside the sewing machine. In addition, the cylinder bed 1 of the bobbin case gripping mechanism 21A, 21A '
The entry into 1a is made by removing the cylinder bed cover or providing an opening in the cylinder bed cover.

Next, the operation of the automatic bobbin thread feeder configured as described above will be described. First, during sewing, one bobbin case 8a is provided inside the shuttle 16 for sewing. At this time, the lower frame 25a is pulled by the air cylinder 26 as shown by the phantom line in FIG. 2 and is in the Z position, and one bobbin case gripping mechanism 21A of the rotating arm 24 does not hold the bobbin case. ,
The other bobbin case gripping mechanism 21A 'has a lower thread winding position C.
The bobbin case 8b for holding the bobbin 7 on which the bobbin thread has already been wound by the bobbin thread winding device 3 is held.

Next, in the standby state, when the bobbin in the shuttle 16 needs to be replaced, the sewing machine is stopped and the lower frame 25a is pushed out by the air cylinder 26 to the position shown by the solid line in FIG.

Next, the motor 33 is driven to rotate the rotary arm 24, and the one bobbin case gripping mechanism 21A not holding the bobbin case is advanced into the sewing machine to face the shuttle 16. Then, the air cylinder 36 is driven to rotate the forward / backward lever 35, and the rotary arm 24 is moved forward, whereby the one bobbin case gripping mechanism 2 is moved.
1A is advanced to the bobbin attachment / detachment position A to hold the bobbin case 8a in the shuttle 16. When the bobbin case gripping mechanism 21A holds the bobbin case 8a, the air cylinder 36 is driven to rotate the forward / backward lever 35 and the rotary arm 24 is retracted to move the bobbin case gripping mechanism 21a. 21A is retracted to the position shown by the solid line in FIG.

Next, the motor 33 is driven to rotate the rotary arm 24, and the other bobbin case gripping mechanism 21A 'holding the bobbin case 8b is advanced into the sewing machine to face the shuttle 16. Then, the air cylinder 36 is driven to rotate the forward / backward lever 35, and the rotary arm 24
By moving the other bobbin case gripping mechanism 21A ′ to the bobbin attachment / detachment position A, the bobbin case 8b is mounted in the shuttle 16. When the bobbin case 8b is mounted by the other bobbin case gripping mechanism 21A ', the rotary arm 24 is retracted to retract the other bobbin case gripping mechanism 21A' to the position shown by the solid line in FIG. . The period from the removal of the bobbin case 8a to the mounting of the bobbin case 8b is the sewing machine stop period.

Then, sewing of the sewing machine is started. In parallel with this, the bobbin exchanging device 21 performs the following operations. That is, the lower frame 25a is pulled by the air cylinder 26 to the position Z shown in phantom in FIG. 2, and the motor 33 is driven to rotate the rotating arm 24 so that the bobbin case holding mechanism 21A faces the residual thread removing device 2. After that, the rotary arm 24 is moved forward, and the residual yarn of the bobbin accommodated in the bobbin case 8a is removed by the residual yarn removing device 2 there, and the bobbin becomes an empty bobbin without a yarn.

Next, the rotary arm 24 is retracted and the motor 33 is driven to rotate the rotary arm 24 so that the bobbin case gripping mechanism 21A faces the lower thread winding device 3 and the bobbin case gripping mechanism 21A is wound. Move forward toward the turning device 3. Then, the bobbin case 8a containing the empty bobbin from which the residual yarn has been removed advances to the lower thread winding device 3, and the lower thread winding device 3 winds the lower thread around the empty bobbin.

Then, these operations are similarly repeated.

As described above, in the present embodiment, the lower thread winding device 3 and the residual thread removing device 2 are arranged outside the sewing machine bed 11a, and the bobbin case 8 is used as each means 21A, 21B of the bobbin exchanging device 21. , 21C, 21D are movable to the bobbin winding position C, the residual yarn removing position B, and the bobbin attaching / detaching position A, so that the bobbin can be moved to the bobbin despite the spatial restriction that the hook 11a is narrow. The lower thread winding operation, the residual thread removing operation, and the bobbin case replacement operation can be automatically performed.

FIG. 3 is a front view of an automatic bobbin thread feeder according to a second embodiment of the present invention. In the second embodiment,
The residual thread removing device 2 and the bobbin thread winding device 3 are arranged at a position shifted in parallel by a distance L to the left in FIG. 3 with respect to the arrangement position of the first embodiment. Each of them is attached to a frame 220A that is a separate body from the portion 20A. The second air cylinder 2 is attached to the frame 220A.
The main body 26 is fixed, and the end of the base plate 20 is fixed to the cylinder rod tip 226 a of the second air cylinder 226. Then, in this embodiment, the rotating means 21D and the second air cylinder 226 constitute the second moving means 230.

Therefore, by driving the second air cylinder 226, each means 21A, 21B, 21C, 2
The entire 1D can be moved in the left-right direction in FIG. 3, and the lower frame 25a at the Z position can be moved to the Z'position. That is, even if the residual thread removing device 2 and the bobbin thread winding device 3 are out of the operating range of the rotating means 21D and the rotating means 21B, the bobbin case holding mechanism 21A, by the second air cylinder 226.
21A 'can be moved to a lower thread winding position C and a residual thread removing position B.

It goes without saying that even with this structure, the same effect as that of the first embodiment can be obtained.

FIG. 4 is a side view of an automatic lower thread feeder according to a third embodiment of the present invention. In the third embodiment,
One end is the lower frame 25a and the other end is the upper frame 25
A slide shaft 40 is provided, which is fixed to each of c and has an axis centered along the axis of the guide shaft 22.
The forward / backward lever 35 described in the embodiment is replaced with a flattened forward / backward lever 45. This forward / backward lever 45
One end of the lever is fitted to the slide shaft 40 and slidable with respect to the slide shaft 40.
The other end of is fixed to the pin 30 protruding from the collar 28. The forward / backward lever 45 is fixed to a pin 36b protruding from the cylinder rod tip portion 36a of the air cylinder 36. The other configurations are similar to those of the first embodiment, and therefore the description thereof is omitted here.

Therefore, when the air cylinder 36 is driven, the forward / backward lever 45 slides in the axial direction while being guided by the slide shaft 40, and accordingly, the collar 28, the boss 24a and the rotary arm 24 are guided along the guide shaft 22. It is designed to move.

It goes without saying that even with this structure, the same effects as in the first embodiment can be obtained.

FIG. 5 is a side view of the automatic bobbin thread feeder of the fourth embodiment of the present invention, and FIG. 6 is a front view of the automatic bobbin thread feeder shown in FIG. The yarn automatic supply device includes a pair of opposing hooks 16 as shown in FIG.
It is applied to a two-needle facing hook sewing machine with A and 16B. Note that the shuttle 16B is omitted in FIGS. 5 and 6 because the drawings are complicated.

The automatic bobbin thread feeder of the fourth embodiment is the third
The difference from the embodiment is that the rotary arm 24 is replaced with a substantially cross-shaped rotary arm 44. Then, the bobbin case gripping mechanisms 21A and 21A 'similar to those in the above-described embodiment are provided at both ends of one flat plate 44A forming the cross, and both ends of the other flat plate 44B forming the cross in FIG. On the right surface (back surface in FIG. 6), bobbin case gripping mechanisms 21AA and 21AA 'having the same structure as the bobbin case gripping mechanisms 21A and 21A' are provided. That is, the bobbin case gripping mechanisms 21A, 21
A ′ and the bobbin case gripping mechanisms 21AA and 21AA ′ are arranged so as to face in opposite directions.

At the right end of the base plate 20 in FIG. 5, a similar upright portion 20B is provided so as to face the upright portion 20A, and the upright portion 20B is provided.
B is provided with a residual thread removing device 2 and a lower thread winding device 3 which are similar to the residual thread removing device 2 and the lower thread winding device 3 provided in the standing portion 20A.

Therefore, the rotating means 2 of the bobbin changing device 21
By driving 1B and the rotating means 21D, the bobbin case gripping mechanisms 21A and 21A 'can face the one shuttle 16A, and the bobbin case gripping mechanisms 21AA and 21AA' can face the other shuttle 16B. Further, the bobbin case gripping mechanisms 21A, 21A 'can be moved to the lower thread winding position C and the residual thread removing position B on the standing portion 20A side, and the bobbin case gripping mechanisms 21AA, 21AA' can be moved to the standing portion 20B.
It is possible to move to the lower thread winding position C and the residual thread removing position B on the side.

Therefore, the same effects as those of the first, second, and third embodiments can be obtained, and the present invention can be applied to a two-needle facing hook sewing machine.

In the fourth embodiment, the other flat plate 44B of the rotary arm 44 is slightly bent in the axial direction, and the open ends of the bobbin cases 8a and 8b on one side and the bobbin case 8c on the other side are formed. , 8d to reduce the distance between the open ends.

FIG. 7 is a side view of an automatic bobbin thread feeder of the fifth embodiment of the present invention. This automatic bobbin thread feeder of the fifth embodiment also has a double needle as shown in FIG. This is applied to the counter hook sewing machine.

The bobbin thread automatic feeder of the fifth embodiment is the third
The difference from the embodiment is that the bobbin case gripping mechanisms 21AA and 21AA 'are provided on the back surfaces of the bobbin case gripping mechanisms 21A and 21A' in the elongated flat plate-shaped rotary arm 24. Since the configuration other than the rotating arm is the same as that of the fourth embodiment, the description thereof is omitted here.

Therefore, similarly to the fourth embodiment, by driving the rotating means 21B and the rotating means 21D of the bobbin exchanging device 21, the bobbin case gripping mechanisms 21A and 21A 'can face the one hook 16A and the bobbin case. Gripping mechanism 21
AA and 21AA 'can be opposed to the other pot 16B.
Furthermore, the bobbin case gripping mechanisms 21A, 21A 'can be moved to the lower thread winding position C and the residual thread removing position B on the standing portion 20A side, and the bobbin case gripping mechanisms 21AA, 21A.
A ′ can be moved to the lower yarn winding position C and the residual yarn removing position B on the standing portion 20B side.

Therefore, the same effects as those of the first, second, and third embodiments can be obtained, and the present invention can be applied to a two-needle facing hook sewing machine.

The invention made by the present inventor has been specifically described based on the embodiments, but the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say, for example, in the above-mentioned first, second, and third embodiments, application examples to the sewing machine 11 shown in FIG. 12 are described.
It is also applicable to sewing machines other than this sewing machine 11.

In the above embodiment, the lower frame 25a is erected and the rotary arm 24 is rotated to move the bobbin case holding mechanism 21A (21A ', 21A).
A, 21AA ') is made to enter the cylinder bed 11a, but when the lower frame 25a is upright, the bobbin case gripping mechanism 21A (21A', 21A).
A, 21AA ') may face the shuttle 16 (16A, 16B).

Similarly, the lower frame 25a is rotated and tilted, and the rotary arm 24 is rotated, so that the bobbin case holding mechanism 21A (21A ', 21AA, 21A).
A ') is moved to the residual thread removing position B, but when the lower frame 25a is rotated and tilted, the bobbin case gripping mechanism 21A (21A', 21AA, 21).
AA ′) may be moved to the residual yarn removing position B.

Furthermore, the lower frame 25a may be set upright at the time of removing the residual thread and winding the lower thread, and the lower frame 25a may be tilted by rotating when the bobbin is replaced.

[0057]

As described above, according to the automatic bobbin thread feeder of claim 1 or 2, the bobbin thread winding device and the residual thread removing device are provided outside the sewing machine bed, and the bobbin case is provided. Is moved to the bobbin winding position, the residual yarn removing position, and the bobbin attaching / detaching position by driving each means of the bobbin changing device.
Therefore, it is possible to automatically carry out the bobbin winding operation for the bobbin, the residual thread removing operation, and the bobbin case replacement operation, regardless of the spatial restriction that the hook portion is narrow.

According to the bobbin thread automatic feeder of claim 3, in addition to claim 1, when the bobbin case is attached to or detached from one of the hooks, one bobbin case gripping means that can face the one hook. When the bobbin case is attached to or detached from the other hook, another bobbin case gripping means that can face the other hook is used, so that it can be applied to a two-needle facing hook sewing machine. Becomes

[Brief description of drawings]

FIG. 1 is a side view of a lower thread automatic feeder according to a first embodiment of the present invention.

FIG. 2 is a front view of the lower thread automatic feeder shown in FIG.

FIG. 3 is a front view of a lower thread automatic feeder according to a second embodiment of the present invention.

FIG. 4 is a side view of a lower thread automatic feeder according to a third embodiment of the present invention.

FIG. 5 is a side view of an automatic bobbin thread feeder according to a fourth embodiment of the present invention.

FIG. 6 is a front view of the lower thread automatic feeder shown in FIG.

FIG. 7 is a side view of a lower thread automatic feeder according to a fifth embodiment of the present invention.

FIG. 8 is a perspective view of a two-needle facing hook sewing machine to which the automatic bobbin thread feeder shown in FIGS. 5 to 7 is applied.

FIG. 9 is an overall perspective view of an automatic bobbin thread feeder of the prior art.

FIG. 10 is a perspective explanatory view showing a carrying state in the lower thread automatic feeder of FIG. 9;

FIG. 11 is a perspective view showing an example of a sewing machine to which the automatic bobbin thread feeder of FIG. 9 can be applied.

FIG. 12 is a perspective view showing an example of a sewing machine to which the automatic bobbin thread feeder of FIG. 9 cannot be applied.

[Explanation of symbols]

2 Remaining yarn removing device 3 Bobbin winding device 7 Bobbin 8, 8a-8d Bobbin case 11a Sewing machine bed 16 shuttle 16A One shuttle 16B Other shuttle 21 Bobbin changing device 21A, 21A 'Bobbin case gripping means (one bobbin case grip) 21AA, 21AA 'Other bobbin case gripping means 21B Rotating means 21C First moving means 21D, 230 Second moving means 22 Single shaft 23 Other shaft A Bobbin attaching / detaching position B Residual thread removing position C Lower thread winding position X, Y rotation locus

Claims (3)

[Claims] 1. A hook provided with a bobbin case containing a bobbin therein, a bobbin thread winding device for winding a bobbin thread around the bobbin, and a residual thread removing device for removing a residual thread of the bobbin. A bobbin case gripping means for attaching and detaching the bobbin case, a rotating means for rotating the bobbin case gripping means around an axis arranged parallel to the shuttle shaft, and a moving means for moving the bobbin case gripping means along the one axis. A first moving means for moving the rotating means and the first moving means to a position where at least a part of a rotation trajectory of the bobbin case gripping means is located inside the sewing machine and a position located outside the sewing machine. Two
And a bobbin exchanging device including: a bobbin changing device, the bobbin winding device and the residual yarn removing device being disposed outside a sewing machine bed, and the bobbin case is driven by driving each means of the bobbin changing device. A bobbin winding position for winding a bobbin around a bobbin in the bobbin winding device, a residual yarn removing position for removing the residual yarn of the bobbin in the residual yarn removing device, and a bobbin attaching / detaching position for attaching / detaching the bobbin to / from the hook. An automatic bobbin thread feeder that can be moved. 2. The automatic bobbin thread feeder according to claim 1, wherein the second moving means rotates the rotating means and the first moving means about another axis arranged parallel to one axis. A rotating means for moving the bobbin case gripping means to a position where at least a part of a rotation locus of the bobbin case gripping means is located inside the sewing machine and a position where the bobbin case holding means is located outside the sewing machine. Automatic bobbin thread feeder. 3. The bobbin thread automatic feeder according to claim 1, wherein the hook is a pair of opposed hooks, and the bobbin case gripping means is one bobbin case gripping means capable of facing one hook and the other hook. Bobbin case gripping means capable of facing the lower bobbin case.