JPH08323085A - Bobbin changer for sewing machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To facilitate the initial mounting of the bobbin case to the bobbin holding means of the bobbin changing device. [Structure] A lever claw 8c for releasing a lock lever of a bobbin case 4 and a locking means 4 for the lever claw 8c on a moving member 35 of a bobbin exchanging device attached to a rotating arm 3.
0 and the main base fixed to the sewing machine body,
An operating mechanism 20 for releasing the fixation of the lever claw 8c by the locking means 40 is provided. By using magnets for the members 30 and 31 for positioning the bobbin case 4, it is possible to temporarily hold the bobbin case 4 until the lock lever is held in the open position during initial mounting. The bobbin exchanging device can be made compact by installing the operating mechanism 20 on the main base.
Can be lightened.

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 a sewing machine, which is constructed such that a bobbin case for accommodating a bobbin therein is grasped for exchanging bobbins.

[0002]

2. Description of the Related Art In a sewing machine that performs sewing using an upper thread and a lower thread, particularly in an industrial sewing machine that performs high-speed sewing work, it is necessary to frequently replace a bobbin wound with a lower thread. Generally, when the bobbin thread is consumed, the operation of the sewing machine is temporarily stopped, the bobbin case is removed from the hook, and then a new bobbin case is mounted in the hook manually.
However, such a manual bobbin case exchanging work is extremely inefficient and causes a decrease in productivity.

Therefore, there is provided a bobbin exchanging device capable of automatically carrying out a series of operations of gripping a bobbin whose bobbin thread has been consumed together with the bobbin case and removing it from the hook, and gripping a new bobbin case and mounting it on the hook. It came to practical use.

This type of bobbin exchanging device is provided with a bobbin holding means for reciprocating between a shuttle position and another working position (such as a bobbin winding position) while holding the bobbin case. Then, for example, one provided with the bobbin holding means 50 shown in FIG. 8 is known.

The bobbin holding means 50 shown in FIG. 8 includes a lever claw 53 for raising and locking the lock lever of the bobbin case, and an actuator (electromagnetic solenoid, air cylinder, etc.) 54 for releasing the lever claw 53. Equipped with.

The lever claw 53 is rotatably supported in the directions of arrows A and B in the drawing by a rotary shaft 52 that is hung between the left and right side plates 51a and 51b of the support member 51, and also has a rotary shaft. A coil spring 56 mounted on the outer periphery of 52 is biased in the direction of arrow A. Then, with the tip 52a of the support member 51 abutting on the front surface of the bobbin case,
By rotating the lever claw 53 in the direction of arrow A, the lock lever is caused by the toe part 53a of the lever claw 53, and further the toe part 53a and the bottom face part 52b of the support member 51.
The lock lever is clamped by and. The bobbin case has a structure that holds the bobbin inside the case when the lock lever is triggered.
By raising and holding the lock lever as described above, the entire bobbin case including the bobbin is gripped.

On the other hand, the actuator 54 includes a support member 51.
An engaging pin 56 attached to the rear part of the output rod 55 and fixed to the front end 55a of the output rod 55 is slidably inserted into a long hole 53b formed in the lower end of the lever claw 53. When the actuator 54 is driven and the output rod 55 is projected, the lever claw 53 is rotated in the direction of arrow B against the urging force of the coil spring 56, and the bobbin holding means 50 releases the holding of the bobbin case. It is supposed to be done.

[0008]

However, in the conventional bobbin exchanging device, since the bobbin holding means 50 as a moving element for holding and moving the bobbin case is provided with the actuator 54, the bobbin holding means is provided. Fifty
However, there is a problem that the moving space of the device becomes large and the device becomes large.

Further, since the weight of the actuator 54 increases the load applied to the rotating arm for moving the bobbin holding means 50, the moving speed of the bobbin holding means 50 cannot be increased and the bobbin case must be replaced. There was a problem that the time required for could not be shortened.

Further, since the electric wire 57, the pipe and the like connected to the actuator 54 are moved together with the bobbin holding means 50, there is a problem that a failure such as disconnection is likely to occur and the reliability is low.

Further, in the conventional bobbin exchanging device, when the bobbin case is mounted on the bobbin gripping means in the initial state, the bobbin case is positioned and held at the tip of the support member 51 by one hand, There is a drawback in that the lever pawl 53 must be moved with the other hand to hang it on the lock lever of the bobbin case. That is, it is necessary to use both hands to mount the bobbin case on the bobbin holding means, which causes a problem that the initial mounting work becomes very complicated.

The present invention was devised to solve the above-mentioned problems of the prior art. An object of the present invention is to provide a bobbin changing device for a sewing machine, which makes it easy to initially mount the bobbin case on the bobbin holding means. To provide.

[0013]

In order to achieve the above object, a bobbin changing device for a sewing machine according to the present invention accommodates a bobbin wound with a bobbin thread inside and holds the bobbin by opening and closing a lock lever. A bobbin holding means for reciprocating between the hook position and other work positions while holding the open bobbin case, and holding the bobbin case accommodated in the hook by the bobbin holding means. In the bobbin exchanging device, the bobbin gripping means removes the bobbin from the shuttle by a hook and conveys another bobbin case prepared at another working position while holding the bobbin case by the bobbin gripping means and mounting the bobbin case in the shuttle. A moving member that reciprocates between a position and another working position, a lever claw that causes the lock lever to be opened from the closed position, and the lever. Locking means for fixing the lock lever in the opened state and the bobbin case at a position where the lock lever can be opened by the lever claw, and the bobbin case is temporarily held until the lock lever is held at the open position. It is characterized in that a temporary holding means is provided.

In the bobbin exchanging device of the present invention, it is preferable that the temporary holding means comprises a plurality of positioning members that engage with the outer peripheral portion of the bobbin case, and a permanent magnet is used for any one of them.

Further, it is preferable that a lever claw opening means for releasing the fixing of the lever claw by the locking means is provided on a main base fixedly mounted on the main body of the sewing machine.

[0016]

In the bobbin exchanging device of the present invention having such a structure, the bobbin case in which the lower thread is consumed is taken out from the hook while being gripped by the bobbin gripping means, and a new bobbin prepared in another work is prepared. The case is mounted in the shuttle while being gripped by the bobbin gripping means.

At this time, in the process of the gripping operation by the bobbin gripping means, the bobbin gripping means first advances toward the bobbin case housed in the shuttle, and the lever claws come into contact with the bobbin case.

Then, by rotating the lever claw, the lock lever of the bobbin case is raised from the closed position and released. After that, the lever claw is fixed by the locking means, so that the lock lever is held at the open position. As a result, the entire bobbin case is gripped, and the bobbin case is removed or mounted as described above.

After the bobbin case is pulled out or mounted, the lever claw releasing means provided on the main base is operated to release the fixing of the lever claw by the locking means, thereby releasing the grip of the bobbin case. .

Further, in the bobbin exchanging device of the present invention, in the initial state, the bobbin case accommodating the bobbin is manually attached to the bobbin holding means by an operator. that time,
By applying the surface of the bobbin case on which the lock lever is provided to the front surface of the moving member, the temporary holding means provided on the moving member positions and temporarily holds the bobbin case at a predetermined position. Then, by engaging the lever claw on the lock lever while the bobbin case is temporarily held, the lock lever is triggered and held in the open position, and the initial mounting of the bobbin case on the bobbin holding means is completed.

As described above, the bobbin exchanging device of the present invention is provided with the lever claw on the moving member, the locking means thereof, and the temporary holding means for positioning and holding the bobbin case with respect to the lever claw. The operation of positioning the bobbin case and the operation of applying the lever claw to the lock lever of the positioned bobbin case can be sequentially performed with one hand, and the operability is good.

On the other hand, when the temporary holding means is not provided, it is necessary to position and hold the bobbin case with one hand, and to operate the lever claw on the lock lever with the other hand. The initial mounting work of the bobbin case becomes very complicated.

In this case, the temporary holding means is composed of a plurality of positioning members that engage with the outer peripheral portion of the bobbin case, and by using a permanent magnet in any of them, the bobbin case is positioned and held by a magnetic attraction force. It can be prevented from falling.

Further, by providing the lever claw opening means on the main base as a fixing member fixed to the sewing machine main body, the lever claw is opened to the moving portion of the bobbin holding means as in the conventional apparatus. It is not necessary to mount an actuator, and the moving part of the bobbin holding means can be made smaller and lighter. As a result, the moving space of the bobbin holding means is reduced, and the bobbin exchanging device can be reduced in size and weight.

Further, by making the moving part of the bobbin holding means smaller and lighter, the moving speed can be increased and the replacement time can be shortened.

Further, since it is not necessary to connect an electric wire, a pipe or the like to the bobbin holding means, failures such as disconnection are reduced and reliability is improved.

[0027]

Embodiments of the present invention will be described below with reference to the drawings.

The bobbin exchanging device according to the present invention constitutes a part of the bobbin thread automatic supplying device shown in FIG. 1, and is arranged in an oil sump space below a sewing machine bed (not shown). Has been done. The above automatic bobbin thread feeder has three working positions arranged at a pitch of about 120 ° around a predetermined base shaft 1, that is, a shuttle position (bobbin case attaching / detaching position) A as shown in FIG. The bobbin case 4 is configured to be sequentially transported between the yarn removing position B and the bobbin winding position C. In addition, the above hook position A and other 2
The two work positions B and C are arranged so as to be displaced from each other in the axial direction by a predetermined amount.

In such a bobbin thread automatic feeder, a main base 2 is fixedly provided in a space below the sewing machine bed, and the base shaft 1 is rotatably attached to the main base 2. In addition, the central boss portion of the rotating arm 3 is mounted on the base shaft 1 so as to be axially slidable and non-rotatable. Further, a rotation drive device (not shown) having a pulse motor or the like is attached to the base shaft 1, and the base shaft 1 together with the rotating arm 3 is approximately 120 by the output of the rotation drive device.
It is designed to rotate in both forward and reverse directions in units of °.

Further, as shown in FIG. 3A, an actuator 5 including an air cylinder and an electromagnetic solenoid is attached to the side surface of the main base 2, and the output rod of the actuator 5 is attached. 5a
One end of the forward-reverse lever 6 is rotatably pin-coupled to the tip of the. The forward / backward lever 6 extends substantially horizontally to a position above the base shaft 1, and an intermediate portion thereof is rotatably pin-connected to the main base 2. Further, a long hole 6a extending in an oblique direction is formed at a free end portion of the forward / backward moving lever 6, and with respect to the long hole 6a,
A pin 3a protruding from the central boss portion of the rotating arm 3 is loosely fitted. Therefore, the output from the actuator 5 is transmitted to the rotary arm 3 via the forward / backward movement lever 6, whereby the rotary arm 3 is reciprocated along the base shaft 1. A coil spring 5b (FIG. 6) is attached to the output rod 5a of the actuator 5, and the rotating arm 3 is biased toward the shuttle 10 by the pressing force of the coil spring 5b. ing.

Further, bobbin holding means 8 constituting a bobbin changing device are provided at both ends of the rotating arm 3, and the bobbin case 4 held by the bobbin holding means 8 is wound with a lower thread. Spinned bobbin 9 (Fig. 3
(See (a)), the rotary arm 3 is
When the bobbin case is attached / detached at the bobbin case attaching / detaching position A, the bobbin case is placed face-to-face with the shuttle 10, the residual yarn removing position B is face-to-face with the residual yarn removing device 12, and the bobbin thread winding position C is provided. It is arranged to face the device 12.

In the bobbin exchanging apparatus of this embodiment, the bobbin case 4, bobbin 9 and shuttle 10 having the conventional structure which has been conventionally used are used as they are. Therefore, although the detailed description of the structure of each of these members is omitted, the schematic structure of the bobbin case 4 will be described with reference to FIG.

As shown in FIG. 4, the bobbin case 4 has a through hole 4a formed in the front surface of the bobbin case 4, which is fitted to the supporting side of the shuttle 10.
Is provided, and a bobbin locking plate 4b is mounted so as to cover the through hole 4a from the upper side so as to slide in the direction orthogonal to the axis. The bobbin locking plate 4b is provided with a locking hole 4c at a position corresponding to the through hole 4a, and a locking claw 4d is projectingly provided at a tip end portion thereof. The sliding movement of the bobbin locking plate 4b reciprocates between the position where the arcuate side of the locking hole 4c covers a part of the through hole 4a and the position where the through hole 4a is fully opened. Moving. Further, at this time, the locking claw 4d is reciprocated between a position in which the bobbin 9 is disengaged from the outside of the case and is in a disengaged state with the bobbin 9 and a position in which the bobbin 9 is engaged with the bobbin 9 in a disengaged state. Is configured. Further, in this bobbin locking plate 4b, the arcuate side portion of the locking hole 4c covers a part of the through hole 4a by the urging force of a spring (not shown), and the locking claw 4d is outside the case. Is disengaged and the bobbin 9 is disengaged. When the arcuate side of the locking hole 4c covers a part of the through hole 4a, the bobbin case 4 is held in the shuttle 10 and the arcuate side of the locking hole 4c is transparent. When the hole 4c is opened, the bobbin case 4 can be detached from the shuttle 10 in a free state.

On the surface of the bobbin locking plate 4b, a lock lever 4e is superposed so that it can be opened and closed. One end of the lock lever 4e is attached to the bobbin case 4
Is hinged to the front surface of the bobbin and extends from the hinge toward the upper surface of the bobbin locking plate 4b. When the lock lever 4e is released, the bobbin locking plate 4b is slid so as to retreat against the urging force of the coil spring, whereby the arcuate side portion of the locking hole 4c extends from the through hole 4a. The bobbin case 4 is detached from the shuttle 10 and is in a free state in which it can be removed. At this time, the locking claw 4d engages with the bobbin 9 so that the bobbin 9 moves into the bobbin case 4.
It is configured to be gripped so as not to be separated from the inside.
The hole 4f provided in the lock lever 4e is formed in a rectangular long hole shape that always opens the through hole 4a and the locking hole 4c.

Next, each bobbin holding means 8 has a pair of side plates 8 arranged substantially parallel to each other, as shown in FIGS. 3 and 5.
A substantially U-shaped support member (moving member) 35 having A and 8B
Is fixed to the tip of the rotating arm 3. Support member 35
A rotary shaft 8b is rotatably provided between both side plates 8A and 8B of the bobbin case 4, and a lever claw 8c that causes the lock lever 4e of the bobbin case 4 described above to be raised from the closed position and released from the rotary shaft 8b. Is attached. The rotary shaft 8b penetrates through the side plate 8B on one side and projects outward, and the operating piece 8Q that constitutes the lock mechanism 40 of the lever claw 8c is fixed to the outward projecting portion of the rotary shaft. .

The lever claw 8c is formed so that the tip end side is curved in an arc shape, and the curved tip end portion is formed on the bobbin case 4.
The lock lever 4e and the bobbin locking plate 4b are arranged so that they can be inserted into the overlapping portion. The tip of the lever claw 8c rotates according to the locus shown by the solid line P in FIG.
The rotation of the lock lever 4e of the bobbin case 4 causes the lock lever 4e of the bobbin case 4 to be rotated and released in accordance with the locus shown by the chain double-dashed line Q in FIG.

The both side plates 8A, 8B are formed in a substantially rectangular shape on the side surface, and the tip edge portion thereof, that is, the hook 10 is formed.
The edge portion facing to is curved and formed in an arc shape as shown in FIG. A semi-cylindrical positioning member 30 is provided on one side plate 8A so as to project from the arc-shaped edge portion 8d. The semi-cylindrical positioning member 30 is formed so as to fit into the recess 4 g formed on the side portion of the bobbin case 4. Then, by inserting the semi-cylindrical positioning member 30 into the recess 4g of the bobbin case 4, the pair of positioning members 31, 31 forming both edges of the arcuate edge 8e of the other side plate 8B.
Comes into contact with the outer periphery of the bobbin case 4 at two locations, and the positioning of the bobbin case 4 and the bobbin holding means 8 is performed by these three positioning members 30, 31, 31 (FIG. 3 (c)). reference).

Further, the above three positioning members 30, 3
Reference numerals 1 and 31 are made of permanent magnets, and can prevent the bobbin case 4 from falling due to a magnetic attraction force, so that the bobbin case 4 can be held in a positioned state.

Further, as shown in FIG. 5 (a), an open lock lever 4e is provided between the side plates 8A and 8B.
A base body 8D is provided for receiving at the open position. The lever receiving surface of the base body 8D is formed as an inclined surface along the lock lever 4e (two-dot chain line in FIG. 5A) in the open position, and the lock lever 4e is formed in the middle thereof.
A rectangular trapezoidal convex portion 8n that enters into the hole 4f is formed. An arcuate concave portion 8p for receiving the tip portion of the lock lever 4e is formed slightly above the inclined surface of the convex portion 8n. The lock lever 4e received by the base body 8D is clamped and fixed in the open state by the pressing force from the lever claw 8c, so that the entire bobbin case 4 is gripped. ing.

On the other hand, in particular, FIGS. 5 (b), 5 (c) and 3
As shown in (a), the outside of the side plate 8B is
Lock mechanism 40 for lever claw 8c, that is, lever claw 8c
An operating piece 8Q that operates in conjunction with the operating piece 8Q and a lock plate 8V that abuts or separates from the operating piece 8Q to lock or unlock the operating piece 8Q are provided adjacent to each other. As described above, the operating piece 8Q has the lever claw 8
The roller 8R is fixed to the rotary shaft 8b of c, and the roller 8R is rotatably attached by a pin 8S to the swing-side end of the operating piece 8Q. Further, an engagement step portion 8QR is formed on a side portion of the operating piece 8Q facing the lock plate 8V, and the engagement step portion 8QR is formed.
It is configured to be fitted with or separated from the locking step portion 8VR formed on the side portion on the V side.

That is, the lock plate 8V is rotatably provided on the shaft 8X provided upright on the side plate 8B, and the roller 8T is provided on the swing end side thereof. A coil spring 8W is attached to the shaft 8X.
The lock plate 8V is urged by W to rotate toward the operating piece 8Q. Further, on the swing end side of the lock plate 8V,
A stopper pin 8Z that restricts the amount of rotation of the operating piece 8Q toward the side is provided upright on the side plate 8B. Therefore, in a state in which no action force is applied to the lock mechanism 40, the locking step portion 8VR of the lock plate 8V is caused to rotate by the rotational biasing force of the coil spring 8W, and the engagement step portion 8QR of the operating piece 8Q.
They are fitted to each other so that the operating piece 8Q is locked in that position. On the other hand, when the lock plate 8V is rotated in the separating direction, both
VR and 8QR are disengaged and the operating piece 8Q is opened.

When the operating piece 8Q and the lock plate 8V are fitted and locked with each other as described above,
The lever claw 8c is stopped at the position where the lock lever 4e of the bobbin case 4 is opened and held (the position shown by the chain double-dashed line in FIG. 5A), and the operating piece 8Q and the lock plate 8V are separated from each other. When the lever claw 8c is in the open position, the lever claw 8c is separated from the lock lever 4e of the bobbin case 4 in the initial position (see FIG.
It is arranged at the position shown by the solid line in (a).

The bobbin holding means 8 as described above is provided with the actuating mechanism 2 attached to the main base 2 side as a fixing member.
0 is configured to perform a gripping operation or a releasing operation thereof. That is, first, the roller 8R of the operating piece 8Q and the roller 8T of the lock plate 8V in the bobbin holding means 8 are arranged so as to have a predetermined gap even when both are locked and closed. The operating plate 21 constituting the operating mechanism 20 is received in the gap between the rollers 8R and 8T.

That is, the operating plate 21 of the operating mechanism 20.
As shown in FIG. 1, is rotatably attached to the fixed frame 22 side attached to the main base 2 as a fixing member via a pin 23.
An output rod 24a of an actuator 24 composed of an air cylinder, an electromagnetic solenoid, etc. is rotatably connected to the base side of the with a pin 26. When the actuator 24 is driven, the operating plate 21
The initial position shown in FIGS. 6A and 6B, and FIG.
It is configured to be rocked between the lock position shown in (c).

As shown in FIGS. 6 and 3 (a), a claw-shaped portion 21a is formed on the swing side portion of the operating plate 21, and the tip 21b of the claw-shaped portion 21a is the above-mentioned. It is formed so as to project in the direction toward the gap between the roller 8R of the operating piece 8Q and the roller 8T of the lock plate 8V when locked. At this time, the roller 8T on the lock plate 8V side is provided so as to be slightly displaced closer to the operating plate 21 side than the roller 8R on the operating piece 8Q side, and the tip of the claw-shaped portion 21a of the operating plate 21 is provided. 21
Reference numeral b denotes an inclined end surface that abuts and guides the roller 8T of the lock plate 8V.

The inner peripheral edge of the claw-shaped portion 21a of the operating plate 21 is formed in a curved shape that abuts and guides the roller 8R of the operating piece 8Q, as shown in FIG. 6 (b). A curved side 21c for guiding the 8Q to the initial position,
As shown in FIG. 6 (c), it has a curved side 21d for guiding the operating piece Q to be pushed into the lock position. At this time, a coil spring 24a is attached to the output rod 24a of the actuator 24, and the operating plate 21 is locked by the pressing force of the coil spring 24a as shown in FIGS. 6 (b) and 6 (c). It is configured to be rotationally biased to the position. Reference numeral 25 in FIG. 3A indicates a guide plate for guiding the roller 8R of the operating piece 8Q of the bobbin holding means 8 in the closing direction.

In the bobbin exchanging device of the present embodiment having the above-described structure, the bobbin case 4 accommodating the bobbin 9 is manually operated by the operator in the initial state, that is, in the preparatory stage before starting the operation of the sewing machine. Both bobbin holding means 8, 8
Be attached to.

At this time, the semi-cylindrical positioning member 30 provided on the one side plate 8A of the bobbin holding means 8 is inserted into the concave portion 4g of the bobbin case 4 so that the bobbin case 4 is attached to the bobbin holding means 8. By applying, the bobbin case 4 is positioned by the semi-cylindrical positioning member 30 and the pair of positioning members 31, 31 provided on the other side plate 8B, and these three positioning members 30, 31 are positioned. , 31 magnetically attract the bobbin case 4 temporarily.

Then, the bobbin case 4 is attached to the positioning member 3
The lock mechanism 40 is temporarily held by 0, 31, and 31.
By operating the with a finger to hang the lever claw 8c on the lock lever 4e of the bobbin case 4, the lock lever 4e is held by the lever claw 8c and held in the open position,
The bobbin case 4 is initially attached to the bobbin holding means 8. At this time, the actuator 2 of the operating mechanism 20
The switch SW1 of No. 4 is turned off, and the operating plate 21a
Are held in the locked position shown in FIG. 6 (c). In addition, the switch SW2 of the actuator 5 of the rotating arm 3
Is turned on, and the bobbin holding means 8 is held at the retracted position shown in FIG. 6 (a).

After mounting the bobbin case 4 on both bobbin holding means 8 provided on the rotating arm 3 as described above, the switch S of the actuator 5 of the rotating arm 3 is mounted.
When W2 is turned off, the bobbin holding means 8 in the locked state advances toward the shuttle 10 rightward in the figure via the forward / backward moving arm 6. And bobbin holding means 8
When the bobbin case 4 gripped by is housed in the shuttle 10, the switch S of the actuator 24 of the operating mechanism 20 is
W1 is switched to the ON state, which causes the operating mechanism 2
The operating plate 21a of 0 is rotated as shown in FIG. 6 (b). When the tip 21b of the claw-shaped portion 21a of the operating plate 21 comes into contact with the roller 8T of the lock plate 8V of the bobbin holding means 8, the roller 8T of the lock plate 8V is guided along the inclined end surface of the tip 21b of the operating plate 21. , Rotate in the opening direction (upward direction in the drawing). When the claw-shaped portion 21a of the actuating plate 21 is further rotated, so that the claw-shaped portion 21a of the actuating plate 21 enters between the lock plate 8V of the bobbin holding means 8 and the actuating piece 8Q, the actuating piece The roller 8R of 8Q is the operating plate 2
1 is guided along the curved side 21c of the claw-shaped portion 21a,
It rotates in the opening direction (downward in the figure).

In this way, the locking stepped portion 8VR of the lock plate 8V of the bobbin holding means 8 and the locking stepped portion 8QR of the operating piece 8Q.
When the engagement with and is disengaged and the operating piece 8Q is opened as shown in FIG. 6B, the lever claw 8c is arranged at the initial position, whereby the grip of the bobbin case 4 is released.

Then, the switch SW2 of the actuator 5
Is switched to the ON state, which causes the forward / backward movement arm 6
The bobbin holding means 8 in the open state is separated from the shuttle 10 via the. At this time, the roller 8R of the operating piece 8Q comes into contact with the guide plate 25 and is closed as shown in FIG.

As described above, the bobbin case 4 is attached to the shuttle 10.
After the sewing machine is mounted, the sewing machine is started to sew.

In the bobbin exchanging device of this embodiment, when the bobbin thread is consumed by the execution of sewing, the bobbin case 4 mounted in the shuttle 10 is pulled out while being held by the bobbin holding means 8. Other work positions B, C
The new bobbin case 4 prepared in step 1 is the bobbin holding means 8
It is mounted in the pot 10 while being gripped by.

At this time, in the process of the gripping operation by the bobbin gripping means 8, first, as shown in FIG. 6A, the switch SW2 of the actuator 5 is turned off,
As a result, the bobbin holding means 8 in the locked state advances toward the right side in the figure toward the bobbin case 4 mounted in the shuttle 10 via the forward / backward movement arm 6. At this time, the switch SW1 of the actuator 24 of the actuation mechanism 20 is turned on, and the actuation plate 21a is held at the initial position.

As the bobbin holding means 8 advances,
The roller 8T provided on the lock plate 8V is connected to the operating mechanism 20.
When contacted with the tip 21b of the claw-shaped portion 21a of the operating plate 21, the roller 8T of the lock plate 8V is guided along the inclined end surface of the tip 21b of the operating plate 21 and moves in the opening direction (upward direction in the drawing). It is rotated. Then, as the bobbin holding means 8 further advances, the claw-shaped portion 21a of the operating plate 21 enters between the lock plate 8V of the bobbin holding means 8 and the operating piece 8Q, whereby the roller 8R of the operating piece 8Q.
Is guided along the curved side 21c of the claw-shaped portion 21a of the operating plate 21 and is rotated in the opening direction (downward in the drawing).

In this way, the locking stepped portion 8VR of the lock plate 8V of the bobbin holding means 8 and the locking stepped portion 8QR of the operating piece 8Q.
When the engagement with is disengaged and the operating piece 8Q is opened as shown in FIG. 6B, the lever claw 8c is arranged at the initial position, and in that state, the lever claw 8c is brought into close contact with the bobbin case 4.

In this state, the switch S of the actuator 5
W2 is switched to the ON state, whereby the bobbin holding means 8 in the locked state holds the bobbin case 4 mounted in the shuttle 10 via the forward / backward movement arm 6 while
The bobbin case 4 which has been separated from and the lower thread has been consumed is removed.

On the other hand, when the new bobbin case 4 prepared at the other working positions B and C is mounted in the shuttle 10 while being gripped by the bobbin gripping means 8, the bobbin gripping means 8, 8 are prepared in the preparation step. The new bobbin case 4 is mounted in the shuttle 10 by the same operation as that performed after the bobbin case 4 is mounted on.

As described above, according to the bobbin exchanging device of this embodiment, the bobbin case 4 can be pulled out or mounted in the hook 1
0, bobbin 9 and bobbin case 4 are automatically performed without any deformation.

In the apparatus of this embodiment, the bobbin holding means 8 as a moving element moved by the rotating arm 3 is not provided with a driving force source for driving the lever claw 8c and is fixed. Since the operating mechanism 20 provided on the main base 2 side as a member operates the locking means 40 on the moving element side, the bobbin case 4 is grasped or released by the lever claw 8c. The bobbin holding means 8 can be reduced in size and weight. As a result, the space for moving the bobbin holding means 8 is reduced, and the bobbin exchanging device can be reduced in size and weight.

Further, since the bobbin holding means 8 is reduced in size and weight, the load on the rotating arm 3 is reduced, so that the rotating speed can be increased, and as a result, the bobbin case replacement time can be shortened.

Further, since it is not necessary to connect an electric wire for supplying electric power or a pipe for supplying a working fluid to the bobbin holding means 8 moved by the rotating arm 3, failures such as disconnection are reduced, Improves reliability.

Further, in the bobbin changing device of this embodiment, the bobbin case 4 is positioned on the both side plates 8A and 8B of the bobbin holding means 8, and the positioning member 30 as a temporary holding means capable of holding the bobbin case 4 by magnetic attraction. Since 31 and 31 are provided, the operation of positioning the bobbin case 4 and the operation of operating the locking mechanism 40 on the lock lever 4e of the positioned bobbin case 4 to apply the lever claw 8c can be performed sequentially with one hand. , Very easy to operate.

On the other hand, when the temporary holding means as described above is not provided, the bobbin case 4 is positioned and held by one hand while the lock mechanism 40 is operated by the other hand. It is necessary to operate the lever claw 8c on 4e, which makes the initial mounting work of the bobbin case 4 very complicated.

The present invention is not limited to the above embodiment.

For example, in the above embodiment, permanent magnets are used for all of the three positioning members 30, 31, 31 which constitute the temporary holding means, but a magnetic attraction force sufficient to prevent the bobbin case 4 from falling is provided. As long as it is obtained, two or only one of them may be composed of permanent magnets.

Further, instead of utilizing the magnetic attraction force as described above, a plurality of positioning members utilizing elastic force such as springs are arranged around the bobbin case holding position, and a pressing force is applied to the bobbin case 4 from several directions. The bobbin case 4 may be positioned and held by the action of. As an example thereof, as shown in FIG. 7, an escape portion 34 for receiving the bobbin case 4 is formed in an intermediate portion of an edge portion of the side plate 8B facing the shuttle 10, and a pair of protrusions on both sides thereof are provided. The ball plungers 36, 36 are mounted facing the bobbin case holding position, and the bobbin case 4 is pressed against the semi-cylindrical positioning member 30 on the side plate 8A side by the pressing force of the ball plungers 36, 36. May be positioned and held. In this structure, the force for holding the bobbin case 4 is weak, but the bobbin case 4 can be easily attached and detached. In addition, in FIG.
The lever claw 8c is omitted.

The method of locking the operating piece 8Q is not limited to the latch type as in the above embodiment, and a permanent magnet is attached to the operating piece 8Q and the side plate 8 is attached.
It is also possible to provide a suction piece on B and lock it by magnetic attraction.

The actuating plate 21 of the actuating mechanism 20 is not limited to the rotating mechanism as described above, and a direct acting mechanism can be adopted.

Further, the switching of the switches for controlling the bobbin case exchange operation can be replaced by a sequential automatic control operation by a computer.

Further, if the thread amount of the bobbin and the like are constantly monitored and each operation is executed based on the detection signal from them, the bobbin case can be replaced more reliably and efficiently. Becomes

[0073]

In summary, the bobbin exchanging device for a sewing machine according to the present invention causes the moving member of the bobbin holding means, which moves between the shuttle position and other working positions, to raise the lock lever of the bobbin case from the closed position. The lever claw to be opened, the locking means to fix the lever claw in the state where the lock lever is opened, the bobbin case is positioned to the position where the lock lever can be opened by the lever claw, and until the lock lever is held at the open position. By providing the temporary holding means for temporarily holding the bobbin case, when the bobbin case is mounted on the bobbin holding means in the initial state, the operation for positioning the bobbin case and the lever claw on the lock lever of the positioned bobbin case are performed. The hanging operation can be performed sequentially with one hand, and the operability is extremely good.

[Brief description of drawings]

FIG. 1 is an external perspective view showing the structure of an automatic bobbin thread feeder including a bobbin changing device according to the present invention.

FIG. 2 is an external perspective explanatory view showing a conveyance state of a bobbin case in the bobbin changing device shown in FIG.

FIG. 3 shows an embodiment of the bobbin changing device of the present invention, (a) is a partial perspective view showing the structure of the bobbin changing device, and (b) is the device shown in (a). FIG. 3C is a perspective view of a main part of the bobbin gripping means, and FIG. 7C is a front view of FIG.

FIG. 4 is a front view showing the structure of the bobbin case.

5A and 5B show a bobbin holding means in one embodiment of the present invention, wherein FIG. 5A is a plan view, FIG. 5B is a front view, and FIG. 5C is a bottom view.

6 is an explanatory plan view for explaining the operation of the bobbin holding means shown in FIG.

7A and 7B show another embodiment of the bobbin holding means, wherein FIG. 7A is a perspective view and FIG. 7B is a front view of FIG.

FIG. 8 is a perspective view showing a structure of a bobbin holding means in a conventional bobbin changing device.

[Explanation of symbols]

 2 main base 4e lock lever 4 bobbin case 5 actuator 8 bobbin gripping means 8c lever claw 9 bobbin 10 hook 20 operating mechanism (lever claw opening means) 21 operating plate 24 actuator 30 positioning member (temporary holding means) 31 positioning member (temporary holding) Means) 35 Supporting member (moving member) 40 Locking means

Claims (1)

[Claims] 1. A bobbin wound with a bobbin thread is accommodated inside, and a reciprocating movement between a shuttle position and other working positions is performed while holding a bobbin case that holds and releases the bobbin by opening and closing a lock lever. Bobbin holding means for removing the bobbin case housed in the hook from the hook by holding the bobbin case held by the bobbin holding means, and another bobbin case prepared at another work position by the bobbin holding means. In a bobbin exchanging device for a sewing machine configured to be conveyed while gripping and to be mounted in a hook, the bobbin gripping means includes a moving member that reciprocates between a hook position and other work positions, and the lock lever is A lever pawl that is caused to open from a closed position; lock means that fixes the lever pawl to hold the lock lever in the open position; Bobbin replacement of the sewing machine characterized in that the bobbin case is positioned at a position where the lock lever can be opened by the bar claw, and a temporary holding means for temporarily holding the bobbin case is provided until the lock lever is held at the open position. apparatus.