JPH08280972A - Bobbin exchanging apparatus - Google Patents

Abstract

PURPOSE: To provide a bobbin exchanging apparatus with good processability by which exchanging operation of a bobbin case magazine can be performed with sufficient time without stopping temporarily a sewing machine. CONSTITUTION: A bobbin case magazine for holding a plurality of bobbin cases 2 for exchanging in which a bobbin for bobbin thread is stored and an exchanging mechanism 6 for performing a series of bobbin exchanging motions consisting of taking out the bobbin case 2 from a shuttle 1 and fitting the bobbin case 2 for exchanging held in bobbin case magazines 4 and 5 in the shuttle 1, are provided. By arranging two bobbin case magazines 4 and 5, even when all the bobbin cases in one bobbin case magazines are used up, another bobbin case magazine is started to be used and during it is being used, exchanging work for the empty bobbin case magazine can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bobbin exchanging device for automatically exchanging a bobbin thread bobbin mounted on a hook of a sewing machine.

[0002]

2. Description of the Related Art In a sewing machine that uses a needle thread and a bobbin thread for sewing, particularly in an industrial sewing machine that performs high-speed sewing work, it is necessary to frequently replace a bobbin thread bobbin. Generally, when the bobbin thread is consumed, the sewing machine operation is temporarily stopped, the bobbin thread bobbin together with the bobbin case is removed from the hook, and then the bobbin bobbin is put into the bobbin case and installed in the hook. It is done by hand. However, such a manual bobbin exchanging operation is extremely inefficient and causes a decrease in productivity.

Therefore, a bobbin exchanging device has been put into practical use, which is capable of automatically removing the bobbin case accommodating the lower thread bobbin from the shuttle and mounting the replacement bobbin case on the shuttle. This type of bobbin changer is designed so that a plurality of replacement bobbin cases accommodating bobbin bobbins can be mounted in the bobbin case magazine and set in the bobbin supply section, using a vertical bobbin case magazine. (JP-A-6-21088) or a disk-shaped bobbin case magazine (JP-A-6-210).
No. 21088) is known.

[0004]

However, since the conventional bobbin exchanging device can mount only one bobbin case magazine, when the bobbin case in the bobbin case magazine is used up, the sewing machine is temporarily stopped to replace the bobbin case or the bobbin case. It was necessary to perform work such as re-mounting in the magazine, and there was downtime for the sewing work. Also, when the last bobbin case of the bobbin case magazine is used, even if the operator is notified by an alarm sound that it is time to replace the magazine, even if the magazine is replaced within the last bobbin case usage time. Or, since it is necessary to re-install the bobbin case, when one operator is in charge of operating multiple sewing machines, there is no time to spare, and in some cases the same downtime as above occurs and sewing efficiency is improved. It was an obstacle to improvement.

The present invention was devised under the circumstances as described above, and the bobbin with a good workability can replace the bobbin case magazine with a sufficient time without suspending the sewing machine. It is to provide a switching device.

[0006]

In order to achieve the above object, a bobbin exchanging device of the present invention accommodates a bobbin case magazine which holds a plurality of replacement bobbin cases accommodating a bobbin thread bobbin and a bobbin thread bobbin. A bobbin exchanging device including a bobbin case detaching from the shuttle and a bobbin exchanging mechanism for performing a series of bobbin exchanging operations for attaching the replacement bobbin case held in the bobbin case magazine to the shuttle. It is characterized by having done.

In the bobbin exchanging device of the present invention, it is preferable that the bobbin case magazine is formed in a laterally long shape so as to hold the bobbin cases for exchanging in a substantially horizontal direction.

[0008]

According to the bobbin exchanging device of the present invention, even when the bobbin case of one bobbin case magazine is used up, the bobbin case of another bobbin case magazine is started by starting to use another bobbin case magazine. Since the sewing can be continued until it is used up, the empty bobbin case magazine can be replaced with sufficient time in the meantime.

If a horizontally long bobbin case magazine is used, the space of the sewing machine can be effectively used to arrange the bobbin case magazines in parallel in the vertical direction. Further, since the horizontal dimension of the sewing machine installation table and the like is less restricted than the height dimension, the bobbin case magazines can be arranged in a row in the horizontal direction, and the expandability is good.

[0010]

EXAMPLE An example of the bobbin changing device of the present invention will be described below. FIG. 1 is a front view of the bobbin changing device, and FIG. 2 is a plan view of the bobbin changing device. 4 is a first bobbin case magazine holding the replacement bobbin case 2, 5 is a second bobbin case magazine holding the replacement bobbin case 2, 6 is a replacement mechanism, and 7 is this bobbin replacement device. 2A and 2B, respectively.

The support substrate 7 is positioned below the shuttle 1 and rearward (upper side in FIG. 2) so as to stand on the sewing machine main body. A base end portion 8a of a transport shaft 8 having an axis parallel to the center shaft 3 is fixed to the support substrate 7, and the transport shaft 8 is cantilevered by the support substrate 7.

The exchange mechanism 6 is provided with a transfer arm 9 on the front end portion 8b side (opposite the supporting substrate side) of the transfer shaft 8 so as to be rotatable about the axis and reciprocally movable in the axial direction. A hollow cylindrical transport bush 10 is rotatably supported on the tip 8b side of the transport shaft 8, and a rotating gear 11 is fitted and fixed to the outer periphery of the end of the transport bush 10 on the side opposite to the support substrate. Further, one end of the transfer arm 9 is fitted and fixed to the outer periphery of the end portion on the side opposite to the supporting substrate from the rotating gear 11. A holding portion 12 is fixed to the other end of the transfer arm 9, and a bobbin case holding means 50 as shown in FIGS. 3 and 5 is provided on the surface of the holding portion 12 facing the shuttle. . 1 and 2, the bobbin case holding means 50 is omitted in order to avoid making the drawings complicated. Therefore, the bobbin case gripping means 50 will be described below with reference to FIGS. 3 and 5.

The holding portion 12 has a U-shaped support plate 53.
Is fixed so as to open upward in FIG. 3, and a nail shaft 54 is rotatably stretched between both side plates 53a and 53b. This nail shaft 54 has
The lock lever 2e of the bobbin case 2 is in the closed position (see FIG.
(See (a)) and open to open position (Fig. 3).
The nail member 55 called a nail to be positioned in (c)).
Is attached. This nail 55 is curved in an arc shape, and its tip portion 55b has a bobbin case 2
The lock lever 2e and the bobbin locking plate 3b are arranged so that they can be inserted into the overlapping portion.

A part (upper part in FIG. 3) of the nail 55 projects outward from between both side plates 53a and 55b, and a pin 55a is projected on the surface of the projecting portion on the side plate 53b side. . A link shaft 57 is provided on the outer surface of the side plate 53b so as to project. A substantially V-shaped link 56 is rotatably supported on the link shaft 57. Cutouts 56a and 56b are formed at both ends of the link 56, and the pin 5 of the nail 55 is formed in the cutout 56a.
5a has a plunger 5 of the solenoid 51 in the notch 56b.
Pins 51b protruding from 1a are loosely fitted and arranged. The solenoid 51 is fixed to the holder 12.

The support plate 53 has two side plates 53a,
A first leaf spring 58 and a second leaf spring 59, which stand upright toward the nail 55 side, are fixed between the portions 53b. The tip portion 59a of the second leaf spring 59 is bent toward the bobbin case 2 side, and may enter the window 2f of the lock lever 2e caused by the nail 55 and receive the edge portion 2i of the window 2f. It is arranged in a possible positional relationship.

Further, the tip portion 58a of the first leaf spring 58 is
Is bent on the side opposite to the tip portion 59a of the leaf spring 59, and is arranged so as to be able to receive the outer surface 2g of the lock lever 2e caused by the nail 55. The lock lever 2e received by the leaf springs 58 and 59 is clamped and fixed in an open state by the pressing force from the nail 55, so that the entire bobbin case 2 is gripped. ing. In FIG. 3, reference numeral 1A indicates an outer pot and 1B.
Indicate inner pots housed in the outer pot 1A, respectively.

As shown in FIG. 2, the rotating gear 11 is a rotating motor gear 1 having a shape elongated along the shuttle shaft direction.
3 are meshed with each other, and the rotation motor gear 13 is a rotation motor (stepping motor) 1 fixed to the support substrate 7.
It is directly connected to the 4th output shaft.

Therefore, when the rotation motor 14 rotates,
A rotary arm 80 composed of the transport arm 9 and the holding portion 12 is configured to rotate via the rotary motor gear 13 and the rotary gear 11. In the present embodiment, the rotating operation of the rotating arm 80 is performed when the rotating arm 80 is in the retracted position retracted from the shuttle position A (see FIG. 2). .

A stop ring 15 is fixed to the outer periphery of the conveying bush 10 on the fixed end 8a side of the conveying shaft 8 with respect to the rotating gear 11, and the rotating gear 11 and the stop ring 15 on the outer periphery of the conveying bush 10 are fixed. A translation collar 16 is rotatably supported between and.

A linear motion gear (rack) 17 is fixedly mounted on the outer periphery of the linear motion collar 16 along the vertical axis direction. A linear motor gear (pinion) 18 is meshed with the linear gear 17, and the linear motor gear 18 is connected to the support substrate 7
It is in a state of being directly connected to the output shaft of a direct drive motor (stepping motor) 19 fixed to the.

Therefore, when the linear motion motor 19 rotates, the rotary arm 80 moves along with the linear motion collar 16 along the axial direction of the transport shaft 8 via the linear motion motor gear 18 and the linear motion gear 17. Has become. That is, the rotating arm 80 can rotate up and down with respect to the transport shaft 8 and can slide back and forth along the transport shaft 8.

By the way, in the present embodiment, the position of the bobbin case holding means 50 at the opposite position of the turning locus,
As shown in FIG. 1, two positions B and C, which are almost directly below the shuttle position A, are the gripping positions of the replacement bobbin case 2. The rotating arm 80 can rotate up and down in the range from the shuttle position A to the gripping positions B and C, and the respective rotating positions A,
B and C can be slid back and forth.

Further, in the present embodiment, the position (see FIG. 2) of the bobbin case gripping means 50 facing the shuttle 1 is set as the origin search position, and the exchanging mechanism 6 is provided with a rotating arm 80. A vertical conveyance origin sensor (not shown) for detecting the origin in the moving direction (vertical direction) and a front-rear conveyance origin sensor (not shown) for detecting the origin in the front-rear direction are provided. The signals from the vertical and forward / backward transport origin sensors are input to a control device (not shown) that controls the overall operation of the bobbin changing device.

When the vertical conveyance origin sensor is turned on, it is determined that the rotary arm 80 is at the origin position in the vertical direction. The bobbin case gripping means 50 can be swung to the shuttle position A and the gripping positions B and C by drivingly controlling the rotary motor 14 with the origin position as a reference by the control device. .

When the front / rear transport origin sensor is turned on, it is determined that the rotating arm 80 is at the origin position in the front / rear direction. Then, the direct drive motor 19 is step-driven by the control device with the origin position as a reference, whereby the bobbin case gripping means 50 is moved to the shuttle position A or the gripping positions B and C and the retracted position (see FIG. 2). .

In the first bobbin case magazine 4, as shown in FIG. 1, a plurality of bobbin case holding shafts 4b (five in this example) are equally spaced on the front surface of a magazine body 4a having a horizontally long rectangular plate shape. In this case, the replacement bobbin case 2 accommodating the lower thread bobbin can be detachably held on each holding shaft 4b. Bobbin case magazine 4
A positioning member 4c, which engages with a corner 2i of the replacement bobbin case 2 (a thread outlet 2h is formed at the tip), has the same positional relationship with respect to each holding shaft 4b. The bobbin cases 2 are attached to the bobbin case holding shaft 4b by engaging the corners 2i with the notches 4d of the positioning member 4c, and the four bobbin cases 2 for replacement are attached to the magazine body 4a. On the other hand, they are all held in the same posture.

The first bobbin case magazine 4 is removably attached to the first magazine moving mechanism 30 (see FIG. 1) which is located below the transport mechanism 6 and is attached to the support substrate 7.

The first magazine moving mechanism 30 is positioned below the conveying mechanism 6 and is horizontally fixed to the support substrate 7 and is guided by a guide rail 30A, and the magazine conveying mechanism is slidably provided on the guide rail 30A. It consists of a stand 30B.
Then, gripping pieces (not shown) projecting near both ends of the front surface of the magazine carrier 30B are gripped by a ball catch mechanism (not shown) provided near both ends of the back surface of the first bobbin case magazine 4. By doing so, the first bobbin case magazine 4 can be accurately positioned and mounted on the magazine carrier 30B.

A left and right moving gear (rack) 32 is fixedly provided on the upper edge of the magazine carrier 30B on the back side. A left and right moving motor gear (pinion) 33 is meshed with the left and right moving gear 32.
Is in a state of being directly connected to the output shaft of a horizontal movement motor (stepping motor) 35 fixed to the support substrate 7.

Therefore, when the left / right moving motor 35 rotates, the first bobbin case magazine 4 together with the magazine carrier 30B is guided by the guide rail 3 via the left / right moving motor gear (pinion) 33 and the left / right moving gear (rack) 32.
It is designed to move left and right along 0A.

The mounting position of the first bobbin case magazine 4 with respect to the magazine carrier 30B is determined by the magazine carrier 30.
The replacement bobbin case 2 held in the first bobbin case magazine 4 when B is moved left and right along the guide rail 30A is set to a position where it sequentially passes through the gripping position B.

Further, the first magazine moving mechanism 30 includes
Origin detection means 36 is provided for detecting the origin in the lateral movement direction of the magazine carrier 30B. The origin detecting means 36 is a left and right conveyance origin sensor 37 fixed to the support substrate 7 by being positioned near the upper end of the magazine carrier 30B.
And an L-shaped shield plate 38 having one end fixed to the upper left corner of the magazine carrier 30B and extending upward and the extending end 38a being bent toward the support substrate 7 side. The left and right conveyance origin detection sensor 37 is used for the magazine conveyance table 3
A shield type optical sensor in which a light emitting element and a light receiving element are vertically opposed to each other through a slit formed along the moving direction of 0B, and the leftmost bobbin case of the first bobbin case magazine 4 is held. The shaft 4b is in the retracted position (in FIG. 1,
When it is moved to D), the bent end of the shield plate 38 enters into the slit of the left and right transport origin detection sensor 37, whereby the light emitting element and the light receiving element are shielded.
The light reception signal of the left / right transport origin sensor 36 is input to the control device described later, and when the light reception signal is cut off, it is determined that the magazine carrier 30B is at the origin position in the left / right moving direction. Then, the left and right moving motor 35 is step-driven by the control device with the origin position as a reference, whereby the magazine carrier 30B is moved left and right along the guide rail 30A.

The second bobbin case magazine 5 has a plurality of bobbin case holding shafts 5b (five in this example) on the front surface of a magazine body 5a having a horizontally long rectangular plate shape like the first bobbin case magazine 4. It is fixed in parallel at equal intervals,
The replacement bobbin case 2 accommodating the lower thread bobbin can be detachably held by each holding shaft 5b. Positioning members 5c that engage the corners 2i of the replacement bobbin case 2 are fixed to the upper front portion of the bobbin case magazine 5 so as to have the same positional relationship with the respective holding shafts 5b. By mounting the case 2 on the bobbin case holding shaft 5b by engaging the corner 2i with the notch 5d of the positioning member 5c, the five replacement bobbin cases 2 are all held in the same posture with respect to the magazine body 5a. It has become so.

This bobbin case magazine 5 has the first
Are arranged in parallel under the magazine moving mechanism 30 of the supporting substrate 7
It is detachably attached to the second magazine moving mechanism 40 attached to.

The second magazine moving mechanism 40 is the same as the first magazine moving mechanism.
A guide rail 40A fixed to the support substrate 7 in parallel with the guide rail 30A of the magazine moving mechanism 30 and a magazine carrier 40B slidably provided on the guide rail 40A. Then, the gripping pieces (not shown) projecting near both ends of the front surface of the magazine carrier 40B are
The second bobbin case magazine 5 can be accurately positioned and mounted on the magazine carrier 40B by being held by the ball catch mechanism (not shown) provided near both ends of the back surface of the bobbin case magazine 5. Has become.

A left and right moving gear (rack) 42 is fixedly provided on the lower edge portion on the back side of the magazine carrier 40B. A left / right moving motor gear (pinion) 43 is meshed with the left / right moving gear 42.
Is in a state of being directly connected to the output shaft of a horizontal movement motor (stepping motor) 44 fixed to the support substrate 7.

Accordingly, when the left / right moving motor 44 rotates, the second bobbin case magazine 5 together with the magazine carrier 40B is guided by the guide rail 4 via the left / right moving motor gear (pinion) 43 and the left / right moving gear (rack) 42.
It is designed to move left and right along 0A.

The mounting position of the second bobbin case magazine 5 with respect to the magazine carrier 40B is the magazine carrier 40.
The replacement bobbin case 2 held in the second bobbin case magazine 5 when B is moved right and left along the guide rail 40A is set to a position where it sequentially passes through the gripping position C.

Further, the second magazine moving mechanism 40 includes
Origin detection means 46 is provided for detecting the origin of the magazine carrier 40B in the left-right movement direction. The origin detecting means 46 is a left and right conveyance origin sensor 47 fixed to the support substrate 7 and positioned near the lower end of the magazine carrier 40B.
And an L-shaped shield plate 48 whose one end is fixed to the lower left corner of the magazine carrier 40B and extends downward, and whose extending end 48a is bent toward the support substrate 7 side. The left and right conveyance origin detection sensor 47 is used for the magazine conveyance table 4
A shield type optical sensor in which a light emitting element and a light receiving element are vertically opposed to each other via a slit formed along the moving direction of 0B, and is the leftmost bobbin case holding shaft of the second bobbin case magazine 5. 5b is a retracted position (E in FIG. 1)
The curved end of the shield plate 48 enters into the slit of the left and right transport origin sensor 47 when moved to, so that the light emitting element and the light receiving element are shielded. The light reception signal of the left / right transport origin sensor 46 is input to the control device, and when the light reception signal is cut off, it is determined that the magazine transport base 40B is at the origin position in the left / right movement direction. Then, the magazine transport table 40B is moved left and right along the guide rails 40A by stepwise driving the left and right moving motor 44 with the origin position as a reference by the control device.

In the vicinity of the position directly below the shuttle position A,
A bobbin thread remaining amount detecting sensor 49 for detecting the bobbin thread amount wound around the bobbin thread bobbin mounted on the shuttle 1 is provided. The bobbin thread remaining amount detection sensor 49 is turned on when the bobbin thread amount wound around the bobbin thread bobbin mounted on the shuttle 1 is below a preset predetermined thread amount, and the signal thereof is output from the control device. It is designed to be input to.

The holding attitude of the bobbin case 2 by the first bobbin case magazine 4 is such that the gripping means 50 is suitable for gripping the bobbin case 2 on the magazine body 4a, that is, at the gripping position B. The angle of the nail 55 of the gripping means 50 (the turning surface of the nail and the horizontal plane H
Angle between the lock lever 2e of the bobbin case 2 and the angle (angle between the rotation surface K of the lock lever and the horizontal plane H) θ. Incidentally, in this embodiment, the angle θ = θ1 of the lock lever 2e in the first bobbin case magazine 4 is set to 45 ° (see FIG. 4).

By holding the bobbin case 2 with the lock lever 2e tilted by 45 ° with respect to the horizontal plane H, the thread end 70 drawn out from the thread discharge port 2h is moved to the bobbin as shown in FIG. It is possible to prevent it from hanging on the front surface of the case 2.

Similarly, the holding attitude of the bobbin case 2 by the second bobbin case magazine 5 is suitable for the gripping means 50 to grip the bobbin case 2 on the magazine body 5a, that is, the gripping position C. In, the angle of the nail 55 of the gripping means 50 is set to match the angle θ of the lock lever 2e of the bobbin case 2. By the way, in this embodiment, the angle θ = θ2 of the lock lever 2e in the second bobbin case magazine 5 is set to 78 ° (see FIG. 4), and in this case, the thread end 70 is further attached to the front surface of the bobbin case 2. It becomes difficult to hang.

Next, the bobbin case replacement operation by the bobbin replacement device of this embodiment will be described. The following operation is performed by the control device driving and controlling the motors 14, 19, 35, 44 and the solenoid 51 based on signals from the lower thread remaining amount detection sensor 49 and the like.

The detection of the lower thread amount by the lower thread remaining amount detecting sensor 49 is executed, for example, every time the thread cutting of the sewing machine is performed. When the lower thread remaining amount detection sensor 49 is turned on,
When it is determined that the remaining amount of the bobbin thread is insufficient, first, the rotating arm 80 is rotated upward. Then, the rotating arm 80 is stopped at a position where the gripping means 50 faces the shuttle 1.

Then, the rotary arm 80 is advanced to move the hook 1
The bobbin case 2 attached to the gripping means 50 is gripped by the gripping means 50. After that, the rotating arm 80 is retracted and rotated downward to stop at the gripping position B, and then the gripping of the bobbin case 2 by the gripping means 50 is released. As a result, the bobbin case 2 removed from the hook 1 falls,
It is collected in a collection container (not shown).

Then, the rotating arm 80 is advanced so that the gripping means 50 grips the replacement bobbin case 2 held in the first bobbin case magazine 4. After that, the rotating arm 80 is retracted and rotated upward, so that the hook 1
After stopping at the position opposite to, move forward. Then, the grip of the bobbin case 2 by the grip means 50 is released, and the rotating arm 80 is retracted.

As described above, the replacement bobbin case 2 is mounted on the shuttle 1 and sewing is started. After the replacement operation is completed, the first magazine moving mechanism 30 is operated to move the first bobbin case magazine 4 to the left, and the next replacement bobbin case 2 is placed at the gripping position B. After that, each time the lower thread remaining amount detecting sensor 49 is turned on, the bobbin case replacement operation is executed. The orbit of the sewing machine is prohibited during the bobbin changing operation.

After that, when all the bobbin cases 2 of the first bobbin case magazine 4 are used, the use of the second bobbin case magazine 5 is started, and the fact is notified by a buzzer sound or the like. Then, while the second bobbin case magazine 5 is being used, the operator replaces the first bobbin case magazine 4 or mounts the bobbin case 2 at the time of mounting.

The exchange operation when using the second bobbin case magazine 5 is the same as when using the first bobbin case magazine 4, except that the rotating arm 80 is controlled to rotate to the gripping position C. is there. When all the bobbin cases 2 of the second bobbin case magazine 5 are used, the use of the first bobbin case magazine 4 is started again.

As described above, the bobbin exchanging device of this embodiment has two bobbin case magazines.
Even when the bobbin case of one bobbin case magazine is used up, sewing can be continued by starting to use the other bobbin case magazine. Then, while the other bobbin case magazine is being used, the empty bobbin case magazine can be replaced or the bobbin case 2 can be reattached, so that the sewing machine does not need to be temporarily stopped, and the bobbin case 2 can be replaced with time. The bobbin case magazine can be replaced with sufficient time.

Further, in this embodiment, the first and second
The holding attitude of each bobbin case 2 in the bobbin case magazines 4 and 5 is suitable for gripping by the gripping means 50, and the thread end 70 drawn out from the thread outlet 2h is difficult to catch on the front surface of the bobbin case 2. Since it is set so as to prevent the yarn end 70 from being entangled with the lock lever 2e or the like when the lock lever 2e is raised or closed (see FIG. 6).

On the other hand, for example, when the thread end 70 is hooked on the front surface of the bobbin case 2 as shown in FIG. 7, the lock lever 2e is held when the bobbin case is held by the holding mechanism 50.
Therefore, the yarn end 70 will be entangled.

When the thread end 70 is entangled with the lock lever 2e, the bobbin case 2 may be damaged due to the improper rotation of the lock lever 2e.
The inner thread bobbin inside may not be locked, and the lower thread bobbin may drop during transfer in the shuttle. Furthermore, there is a risk that the bobbin case 2 cannot be gripped and the bobbin case falls.

Therefore, conventionally, it was necessary to blow air onto the yarn end 70 so that the yarn end 70 would not be caught on the surface of the bobbin case 2 on which the lock lever 2e is located. According to the configuration of this embodiment, it is not necessary to take such measures, the device configuration can be simplified, and the cost can be reduced. The bobbin changing device of the present invention is not limited to the above embodiment.

For example, in the above embodiment, the case where two bobbin case magazines are vertically arranged in parallel has been described as an example, but three or more bobbin case magazines may be arranged in parallel. Further, the guide rails 30A and 40A may be extended in the horizontal direction, and two or more guide rails 30A and 40A may be arranged in a column.

Further, five or more (for example, ten) replacement bobbin cases 2 may be attached to the bobbin case magazine. In addition, the bobbin case replacement mechanism 6
Is not limited to the one in which the bobbin case is conveyed by rotating the rotating arm 80 provided with the bobbin case grasping means 50 as described above, and the bobbin case grasping means 50 is linear in the XY direction and the Z direction. Alternatively, the bobbin case may be transported by moving to.

In the above embodiment, the bobbin case 2 removed from the shuttle 1 is dropped and collected in the recovery container, but the bobbin case 2 removed from the shuttle 1 may be returned to the bobbin case magazine.

The holding position of the replacement bobbin case 2 by the holding means 50 is not limited to the above-mentioned two positions B and C, and may be any position as long as it is on the turning path of the holding means 50. However, as described above, in order to make it difficult for the thread end to be caught on the front surface of the bobbin case 2, the range of the position F at which the lock lever 2e can be held at a tilt angle of 315 ° with respect to the horizontal plane H (at a position F at which it can be held ( It is desirable to set (see FIG. 4) as the gripping position.

[0060]

In summary, according to the bobbin exchanging device of the present invention, by disposing a plurality of bobbin case magazines, even when the bobbin case of one bobbin case magazine is used up, another bobbin case magazine is started to be used. By doing so, sewing can be continued, and during that time, the empty bobbin case magazine can be replaced with sufficient time, and operability is improved.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a bobbin changing device of the present invention.

FIG. 2 is a partial plan view of the above bobbin changing device.

FIG. 3 is an operation explanatory view showing an operation of a gripping means.

FIG. 4 is an explanatory diagram showing a range in which the bobbin case has an ideal holding posture for gripping the bobbin case by a gripping means.

FIG. 5 is a partial rear view showing a state in which the bobbin case is gripped by the gripping means.

FIG. 6 is a partial rear view showing a state in which the bobbin case is gripped by the gripping means.

FIG. 7 is a partial rear view showing a state in which the bobbin case is gripped by the gripping means.

[Explanation of symbols]

 1 hook 2 bobbin case 4 bobbin case magazine 5 bobbin case magazine 6 exchanging mechanism 50 gripping means 80 rotating arm A hook position B gripping position C gripping position E gripping position

Claims (1)

[Claims] 1. A bobbin case magazine for holding a plurality of replacement bobbin cases accommodating a bobbin thread bobbin and a bobbin case accommodating a bobbin thread bobbin from a hook, and a replacement bobbin retained in the bobbin case magazine. A bobbin exchanging device having a bobbin exchanging device for performing a series of bobbin exchanging operations for mounting a case on a hook, wherein a plurality of bobbin case magazines can be arranged.