JP3914565B2 - Lower thread changing device of sewing machine - Google Patents

Description

  The present invention relates to a lower thread changing device of a sewing machine, and more particularly to a lower thread changing device of a sewing machine capable of automatically changing a bobbin case around which a lower thread is wound.

  Conventionally, in a multi-head type sewing machine having a plurality of sewing heads such as a single head sewing machine such as a sewing machine or an embroidery sewing machine, the bobbin in a bobbin case attached to the hook A bobbin thread exchanging device that automatically replaces the bobbin case with a new bobbin case in which the bobbin on which the bobbin thread is wound has been proposed when the bobbin thread being wound is exhausted (for example, Patent Document 1).

By the way, this type of lower thread exchanging device needs to take out the bobbin case that is empty when the lower thread is consumed while sequentially supplying the bobbin case around which the lower thread is wound to the hook. In addition, when the bobbin case is attached to and detached from the hook, it is necessary to perform an operation that causes a lock claw, which causes a problem that the operation mechanism of the lower thread changing device is complicated.
JP 2000-61185 A

  In view of the problems of the above-described conventional lower thread exchanging device, the present invention provides an operation for attaching the bobbin case to the hook by pressing the front surface of the bobbin case toward the hook while raising the lock claw of the bobbin case, The bobbin case is pulled out of the hook while raising the lock claw of the bobbin case mounted on the hook, and the operation of detaching is performed by one mechanism, so that the operation mechanism of the lower thread changing device can be simplified. An object of the present invention is to provide a yarn changing device.

In order to achieve the above object, a lower thread changing device of a sewing machine according to the present invention includes a bobbin case accommodating part capable of accommodating a plurality of bobbin cases around which a lower thread is wound, and the bobbin case accommodating part. The bobbin case sending mechanism that feeds the bobbin cases one by one toward the hook one by one, and the front of the bobbin case is pushed toward the hook while raising the lock claw of the bobbin case sent toward the hook by the bobbin case sending mechanism The sewing machine bobbin has an operation to attach the bobbin case to the hook, and a lock claw operating mechanism that pulls the bobbin case out of the hook while raising the lock claw of the bobbin case attached to the hook. It is an exchange device, and the lock claw operation piece of the lock claw operation mechanism is attached via a spring, and the front surface of the bobbin case is directed to the hook by the biasing force of the spring The bobbin case is pulled out from the hook by applying pressure and the spring is bent, and the lock claw operating piece of the lock claw operating mechanism and the moving part by the bobbin case sending mechanism are connected by a rope, and the moving part is moved. It is characterized in that the spring is bent by causing the spring to be bent .

  Further, a magazine containing a plurality of bobbin cases around which the bobbin thread is wound can be mounted on the bobbin case accommodating part.

  Further, the plurality of bobbin cases around which the lower thread is wound can be accommodated in the bobbin case accommodating portion with a spacer interposed between the bobbin cases.

  Further, each component of the lower thread changing device of the sewing machine can be integrated with the mounting plate, and the lower thread changing device of the sewing machine can be detachably attached to the sewing machine body via the mounting plate.

  The bobbin thread changing device of the sewing machine according to the present invention sequentially feeds a plurality of bobbin cases around which bobbin threads housed in a bobbin case housing portion are wound one by one to a shuttle by a bobbin case feeding mechanism. The bobbin case is attached to the hook by pushing the front surface of the bobbin case toward the hook while raising the lock claw of the bobbin case sent out toward the hook by the bobbin case sending mechanism. The bobbin case is pulled out from the hook while lifting the lock pawl of the bobbin case attached to the hook, and the operation is performed to remove it. it can.

The lower thread exchanging device of the sewing machine is attached with a lock claw operating piece of the lock claw operating mechanism via a spring, and the front surface of the bobbin case is pressed toward the hook by the urging force of the spring, and the spring is bent. By pulling the bobbin case out of the hook, the lock claw operating piece of the lock claw operating mechanism and the moving part by the bobbin case delivery mechanism are connected by a rope, and the spring is bent by moving the moving part. By doing so, the bobbin case can be operated reliably, and the lock pawl operation mechanism drive mechanism can be replaced by the bobbin case delivery mechanism to lock the lock pawl operation mechanism. The structure of the drive mechanism of the nail operation piece can be simplified.

  In addition, a magazine containing a plurality of bobbin cases around which bobbin yarn is wound is mounted on the bobbin case housing part, so that the bobbin case around which the bobbin thread is wound can be easily housed. can do.

  Further, the bobbin case accommodated in the bobbin case accommodating portion is configured such that a plurality of bobbin cases around which the lower thread is wound are accommodated in the bobbin case accommodating portion with a spacer interposed between the bobbin cases. The bias of the case can be prevented and the bobbin case can be smoothly fed out.

  Further, each component of the lower thread changing device of the sewing machine is arranged integrally with the mounting plate, and the lower thread changing device of the sewing machine is detachably attached to the sewing machine main body via the mounting plate. It is possible to simplify the troubles when mounting the lower thread changing device, and it is possible to easily and accurately adjust the position.

  Embodiments of a lower thread changing device of a sewing machine according to the present invention will be described below with reference to the drawings.

1 to 18 show an embodiment of a bobbin thread changing device for a sewing machine according to the present invention.
When the bobbin thread S wound around the bobbin (not shown) in the bobbin case B attached to the hook K of the sewing machine main body F runs out, the bobbin case B This is for automatic replacement with a new bobbin case B in which the bobbin around which the bobbin thread S is wound is housed. A single-head sewing machine having one sewing head such as a sewing machine or an embroidery sewing machine, etc. The present invention can be applied to any of the multi-head sewing machines having a plurality of sewing heads.
The drawing exemplarily shows one sewing head, and in the case of a multi-head type sewing machine having a plurality of sewing heads such as an embroidery sewing machine, a driving mechanism and / or corresponding to each sewing head as necessary. The control mechanism can be configured to be shared and / or interlocked. Specifically, when the driving mechanism corresponding to each sewing head is to be linked, for example, a driving shaft is spanned over each sewing head, and the driving shaft is driven by a common driving source. Constitute.

The sewing machine lower thread exchanging device includes a bobbin case housing portion 1 capable of housing a plurality of bobbin cases B around which the lower thread S is wound, and a bobbin case housing the bobbin case housing portion 1. The bobbin case delivery mechanism 2 that sequentially feeds B toward the hook K one by one, and the front surface of the bobbin case B while raising the lock claw Ba of the bobbin case B sent toward the hook K by the bobbin case delivery mechanism 2 The operation of attaching the bobbin case B to the hook K by pressing it toward the hook K, and the operation of pulling the bobbin case B away from the hook K while raising the lock claw Ba of the bobbin case B attached to the hook K The main part is comprised from the lock nail | claw operating mechanism 3 which performs.
Here, the bobbin case B around which the bobbin thread S is wound is stored in the bobbin case B with the bobbin case B wound with a predetermined length of the bobbin thread S, and is sewn or embroidered by being mounted on the hook K. This means that the tip of the lower thread S is pulled out from the bobbin case B so that it can be started.

In this case, the bobbin case accommodating portion 1 includes an accommodating portion main body 11, a magazine 12 for accommodating a plurality of bobbin cases B around which a bobbin thread S configured to be detachable from the accommodating portion main body 11 is wound, It comprises a guide member 13 used when the magazine 12 is mounted on the main body 11.
Thereby, the bobbin case B in which the lower thread S is wound around the bobbin case housing portion 1 can be easily accommodated.
The guide member 13 is used when a large sewing machine (sewing machine with a distance to the shuttle K) is used, and when the magazine 12 is not directly attached to the housing body 11, and can be omitted. In addition, a plurality of bobbin cases B around which the lower thread S is wound around the housing main body 11 can be directly housed without using the magazine 12.

More specifically, as shown in FIGS. 7 to 9, the bobbin case housing portion 1 connects a housing portion main body 11 and a guide member 13 extending to the housing portion main body 11.
A locking member 15 for preventing the magazine 12 mounted on the housing main body 11 from coming out is provided on the inlet side of the housing main body 11, and a bobbin case B housed in the magazine 12 is sent out on the outlet side. The locking members 16 to be restricted are respectively disposed.

As shown in FIG. 8, the locking member 15 is configured to swing by operating the operation lever 15 b or the rope 15 c of the swing operation mechanism 15 a, thereby opening the entrance side of the housing portion main body 11. Then, after the magazine 12 is introduced from the guide member 13 into the housing main body 11, the operation is canceled to prevent the magazine 12 attached to the housing main body 11 from coming out.
In this case, the locking member 15 can be directly operated by hand, and can be temporarily held by the clip mechanism 15d so that the inlet side of the housing portion main body 11 is opened.

As shown in FIG. 9, the locking member 16 swings by operating the swinging piece 16 b to which the locking member 16 is attached, by the operation piece 16 a interlocked with the moving part 32 by the lock claw operating mechanism 3. Thus, the outlet side of the accommodating portion main body 11 is opened, the bobbin case B accommodated in the magazine 12 is sent out toward the hook K, and then the operation is released to accommodate the magazine 12 in the magazine 12. The bobbin case B is prevented from being sent out any further.
In addition, the drive mechanism of the locking member 16 can be separately provided irrespective of the lock claw operation mechanism 3. For example, as a driving mechanism of the locking member 16, a driving source such as a rotary solenoid SO1 is used as in the modified embodiment shown in FIG. 10, and the locking member 16 is attached to the lever SOa of the rotary solenoid SO1. Can do.

  Further, when the operation of introducing the magazine 12 from the guide member 13 into the housing portion main body 11 cannot be performed directly due to the relationship of the work position or the like, as shown in FIG. 12 is pushed from the guide member 13 into the housing main body 11. Further, when the magazine 12 emptied with all the bobbin cases B sent out from the housing body 11 to the guide member 13, a magnet 14 a is arranged on one end side of the operation rod 14, and the magazine 12 Is attracted to the magnet 14 a and pulled out from the guide member 13 through the housing main body 11.

The magazine 12 includes an urging mechanism 12a made of a spring member for sending out the bobbin case B accommodated in the magazine 12 toward the hook K, and in accordance with the mounting of the magazine 12 on the accommodating portion main body 11, The release piece 12b of the urging mechanism 12a of the bobbin case delivery mechanism 2 is brought into contact with the protruding piece 12e disposed on the bobbin case delivery mechanism 2 side, the release piece 12b is released, and the urging mechanism 12a automatically functions. It is configured to do.
Further, the release piece 12b slides on the magazine 12, and a slit 12c for accommodating the bobbin case B in the magazine 12 with the tip of the lower thread S pulled out from the magazine 12 and a projection of the bobbin case B are provided. A slit 12f that prevents the rotation of the bobbin case B accommodated in the magazine 12 is formed.
Further, the magazine 12 is mounted on the magazine 12 so as not to rotate (the bobbin case B accommodated in the magazine 12 is positioned without rotating). 2 guide pins 12d for projecting toward K) so as to sandwich the slit 12c.
In the accommodating portion main body 11 and the guide member 13, a guide groove 11a for guiding the two guide pins 12d projecting from the magazine 12 is formed.
Further, the magazine 12 is provided with a placing plate 12g for placing the tip of the lower thread S pulled out from the magazine 12.
Further, the magazine 12 is provided with a locking piece 12h for preventing the release piece 12b from malfunctioning when the magazine 12 is stored or transported (this locking piece 12h is the magazine 12). When the release piece 12b comes into contact with the protruding piece 12e and the locked state is released, the contact piece 11b comes into contact with the storage body 11 and moves from the locking position of the release piece 12b. In addition, the lock plate 12i for locking the locking piece 12h can be provided as necessary.

In accommodating a plurality of bobbin cases B around which the lower thread S is wound around the magazine 12, a spacer SP shown in FIGS. 13 (F) and 13 (G) is interposed between the bobbin cases B. Is desirable.
Accordingly, it is possible to prevent the unevenness due to the unevenness of the surface of the lock claw Ba or the like of the bobbin case B accommodated in the magazine 12 and to smoothly feed the bobbin case B.
As shown in FIGS. 13C and 14, the pressing member 12 j that transmits the urging force of the urging mechanism 12 a to the bobbin case B accommodated in the magazine 12 has a contact surface with the bobbin case B. By forming the concave portion 12k that absorbs the irregularities on the surface of the bobbin case B, such as the lock claw Ba, it is possible to prevent the bobbin case B from being biased. When the number is small (for example, two), the bobbin case B can be smoothly fed out even if the spacer SP is omitted.

Further, when a plurality of bobbin cases B around which the lower thread S is wound are accommodated in the magazine 12, it may be directly performed manually, but as shown in FIG. Using the mounting base 17 formed with an inclined guide groove 17a on which the bobbin case B and the spacer SP can be placed side by side, the bobbin case B and the spacer SP placed side by side on the guide groove 17a are attached to the biasing mechanism 12a. It can be accommodated while being pushed into the magazine 12 against the force.
In this case, a cutter mechanism 18 for trimming the yarn S drawn from the bobbin case B accommodated in the magazine 12 to a predetermined length is provided. The cutter mechanism 18 includes a cutter blade 18a and a swinging member 18b to which a rubber thread holding piece 18c is attached. The cutter mechanism 18 is configured so that the thread S is not pulled out from the bobbin case B by pressing the thread S pulled out from the bobbin case B by the thread pressing piece 18c attached to the swing member 18. By holding the end of the thread S pulled out from the bobbin case B and pulling it down, the thread S is cut by the cutter blade 18a, and the thread S pulled out from the bobbin case B accommodated in the magazine 12 is removed. Trimming to a predetermined length.
Thereby, the operation | work which accommodates the several bobbin case B by which the bobbin thread S is wound up by the magazine 12 can be performed efficiently.

The bobbin case delivery mechanism 2 that sends out the bobbin cases B accommodated in the magazine 12 attached to the bobbin case accommodation part 1 one by one toward the hook K one by one, a support frame 21 that supports the bobbin case accommodation part 1, It comprises a drive mechanism 22 for moving the bobbin case housing part 1 to and away (reciprocating) from the shuttle K. Further, the drive mechanism 22 connects the tip part to the bobbin case housing part 1 and the base end part to the stepping motor. A swing piece 22a connected to the rotation drive shaft 22b of the rotation drive source M1 and the like, and a sensor mechanism 22c for detecting the swing angle of the swing piece 22a and controlling the drive of the rotation drive source M1.
Instead of the rotational drive source M1 of the drive mechanism 22, a linear motion drive source C such as an air cylinder can be used as in the modified embodiments shown in FIGS.

As shown in FIG. 6, the lock claw operating mechanism 3 pushes the front surface of the bobbin case B toward the hook K while raising the lock claw Ba of the bobbin case B sent out toward the hook K by the bobbin case delivery mechanism 2. The operation of mounting the bobbin case B to the hook K (see FIGS. 18A to 18D) and the bobbin case B to the hook K while raising the lock claw Ba of the bobbin case B mounted to the hook K A power conversion mechanism 31 composed of a rack and pinion that converts the rotational motion of a rotational drive source M2 such as a stepping motor into a reciprocating motion, which performs an operation of pulling it out and removing it (see FIGS. 18E to 18F). The moving part 32 that reciprocates via the power conversion mechanism 31, the leaf spring 33 with the proximal end attached to the moving part 32, the lock claw operating piece 34 attached to the distal end of the leaf spring 33, and the rotary drive Consisting sensor mechanism 35 which controls the driving source M2. And the front-end | tip part 34a of the lock nail | claw operation piece 34 is formed in a wedge shape.
Thereby, in the operation of mounting the bobbin case B to the hook K, the front surface of the bobbin case B is pressed toward the hook K by the urging force of the leaf spring 33, while the bobbin case B is pulled out from the hook K. In the operation of detachment, the structure of the drive mechanism can be simplified by pulling out the bobbin case B from the hook K by bending the leaf spring 33.
As the drive mechanism of the moving unit 32, a drive source such as a rotary solenoid SO2 can be used instead of the rotation drive source M2 and the power conversion mechanism 31 as in the modified examples shown in FIGS. When the rotary solenoid SO2 is used as the drive source, the swinging motion of the lever SOb of the rotary solenoid SO2 is converted into a reciprocating motion so that the moving unit 32 is reciprocated.
Further, instead of the plate spring 33, a lock claw operating piece 34 is attached to a spring structure made up of a coil spring and a plate such as a metal plate, or a plate such as a metal plate to which the lock claw operating piece 34 is attached. The body can be directly operated by a driving mechanism such as a rotary solenoid.

By the way, in this embodiment, the lock claw operation piece 34 of the lock claw operation mechanism 3 and the moving part 23 by the bobbin case delivery mechanism 2 are connected by the rope W, and the leaf spring 33 is moved by moving the moving part 23. Is bent.
Thereby, the drive mechanism of the lock claw operating piece 34 can be substituted by the bobbin case delivery mechanism 2 and the structure can be simplified.
Instead of this drive structure, as shown in FIGS. 6, 11, and 12, the leaf spring 33 is bent by swinging the leaf spring operation piece SOc by a drive mechanism such as a rotary solenoid SO3. Accordingly, the degree of freedom in driving between the plurality of sewing heads can be ensured.
In the modified embodiment shown in FIGS. 11 and 12, the lock claw operating piece 34 is formed by processing the upper part of the leaf spring 33.
Further, in the modified embodiment shown in FIGS. 11 and 12, the lock claw operating mechanism 3 including the leaf spring 33 can be swung around the swing shaft 36 and can be fixed with a screw 36 at a predetermined position. Configure.
Thereby, the front surface of the hook K can be opened, and workability at the time of maintenance can be improved.

A chute 4 is disposed below the front surface of the hook K.
Thus, the lock claw operation mechanism 3 receives the spacer SP, which has been pulled out of the hook K and separated from the bobbin case B and the magazine 12, by the chute 4 and collects it in one place.
As shown in FIG. 16, the chute 4 includes a fixed chute 41 disposed immediately below the front surface of the hook K and a movable chute 42 connected to the fixed chute 41. The side wall is a movable portion 42a.
As a result, the movable portion 42a of the movable chute 42 is bent downward to widen the space below the front surface of the hook K, the lower thread S is cut, and the bobbin case B attached to the hook K is hand-held. Work such as when making individual adjustments in the work can be easily performed.
Further, a cushioning material such as a felt 43 is attached to the surface of the chute 4.

Next, an automatic replacement method of the bobbin case B using the sewing machine lower thread changing device will be described.
When the bobbin thread S wound around the bobbin in the bobbin case B attached to the hook K is lost, the tip 34a formed in the wedge shape of the lock claw operating piece 34 of the lock claw operating mechanism 3 is The lock claw Ba of the bobbin case B is raised by being inserted between the bobbin case B and the lock claw Ba attached to the bobbin case, and the moving unit 23 of the bobbin case delivery mechanism 2 is moved to move the moving unit 23 The leaf spring 33 is bent through the lock claw operation piece 34 connected by the rope W, and the bobbin case B is pulled out from the hook K and separated.
The bobbin case B detached from the hook K is received by the chute 4 and collected in one place.
Next, the bobbin case housing portion 1 in which the magazine 12 housing a plurality of bobbin cases B around which the bobbin thread S is wound is brought close to the hook K by the bobbin case delivery mechanism 2. By moving the moving part 32 by the lock claw operating mechanism 3, the operating piece 16a interlocked with the moving part 32 is caused to swing the swinging piece 16b to which the locking member 16 is attached. Is opened, and the bobbin case B accommodated in the magazine 12 is sent out toward the hook K.
At this time, the spacer SP housed in the magazine 12 together with the bobbin case B falls, is received by the chute 4 and collected in one place.
The bobbin case B sent out toward the hook K is temporarily held in the hook K. In this state, the tip 34a formed in the wedge shape of the lock claw operating piece 34 of the lock claw operating mechanism 3 is used as a bobbin. By inserting between the case B and the locking claw Ba, the locking claw Ba of the bobbin case B is raised, and the front surface of the bobbin case B is pressed toward the hook K by the urging force of the leaf spring 33. Make sure that B is completely attached to the hook K.
As a result, the installation of the new bobbin case B in which the bobbin around which the lower thread S is wound is accommodated in the hook K is completed, and sewing and embroidery can be performed.
Hereinafter, when the bobbin thread S wound around the bobbin in the bobbin case B attached to the hook K is lost, the same operation is repeated to remove the bobbin case B attached to the hook K from the magazine. 12 can be replaced with a bobbin case B in which the lower thread S accommodated in 12 is wound.

  As described above, this bobbin thread exchanging device is configured such that a plurality of bobbin cases B around which the bobbin thread S housed in the bobbin case housing portion 1 is wound are sequentially transferred to the hook by the bobbin case delivery mechanism 2 one by one. The front of the bobbin case B is moved to the hook K while the lock claw operating mechanism 3 raises the lock claw Ba of the bobbin case B sent to the hook K by the bobbin case sending mechanism 2. The operation of attaching the bobbin case B to the hook K by pressing toward the hook K and the operation of pulling out the bobbin case B from the hook K while raising the lock claw Ba of the bobbin case B attached to the hook K are performed. Therefore, the operation mechanism of the lower thread exchanging device can be configured easily.

19 to 25 show modified embodiments of the lower thread changing device of the sewing machine of the present invention.
The lower thread changing device of the sewing machine, when the lower thread S wound around the bobbin (not shown) in the bobbin case B attached to the shuttle K of the sewing machine main body F disappears, as in the above embodiment. A single-headed type equipped with one sewing head such as a sewing machine for automatically replacing the bobbin case B with a new bobbin case B in which a bobbin around which a bobbin thread S is wound is housed. The present invention can be applied to any of a multi-head sewing machine having a plurality of sewing heads such as a sewing machine and an embroidery sewing machine.
Unless otherwise specified, the configuration and operation of the bobbin thread changing device of the sewing machine of this embodiment are the same as those of the above embodiment.

  The sewing machine lower thread exchanging device includes a bobbin case housing portion 1 capable of housing a plurality of bobbin cases B around which the lower thread S is wound, and a bobbin case housing the bobbin case housing portion 1. The bobbin case delivery mechanism 2 that sequentially feeds B toward the hook K one by one, and the front surface of the bobbin case B while raising the lock claw Ba of the bobbin case B sent toward the hook K by the bobbin case delivery mechanism 2 The operation of attaching the bobbin case B to the hook K by pressing it toward the hook K, and the operation of pulling the bobbin case B away from the hook K while raising the lock claw Ba of the bobbin case B attached to the hook K The main part is comprised from the lock nail | claw operating mechanism 3 which performs.

Further, in this lower thread changing device of the sewing machine, the constituent members of the lower thread changing device of the sewing machine are arranged integrally with the mounting plate P, and the lower thread changing device of the sewing machine is attached to the sewing machine main body F via the mounting plate P. It is designed to be detachable.
As a result, it is possible to simplify the troubles when attaching the lower thread changing device to the sewing machine, and it is possible to easily and accurately adjust the position.

In this case, the bobbin case housing portion 1 includes a housing portion main body 11 and a magazine 12 that houses a plurality of bobbin cases B around which a lower thread S configured to be detachable from the housing portion main body 11 is wound. To do.
Thereby, the bobbin case B in which the lower thread S is wound around the bobbin case housing portion 1 can be easily accommodated.

  More specifically, as shown in FIGS. 19 to 21, the bobbin case housing portion 1 has a latch that prevents the magazine 12 attached to the housing portion main body 11 from coming out from the entrance side of the housing portion main body 11. On the outlet side of the member 15, a locking member 16 for restricting the bobbin case B accommodated in the magazine 12 from being sent out is provided.

  In this embodiment, the locking member 15 is configured to be directly operated by hand, while the locking member 16 is a rotary solenoid SO1 disposed on the sewing machine main body F side as shown in FIGS. The lever SOa is configured by a leaf spring member that is deformed by operating the operation piece 16c of the locking member 16, whereby the outlet side of the housing portion main body 11 is opened, and the bobbin case B housed in the magazine 12 is opened. The bobbin case B accommodated in the magazine 12 is prevented from being sent any further by releasing the operation toward K and then releasing the operation.

As shown in FIG. 23, the magazine 12 includes an urging mechanism 12 a made of a spring member for feeding the bobbin case B accommodated in the magazine 12 toward the hook K, and the magazine 12 is attached to the accommodating portion main body 11. In accordance with the mounting, the release piece 12b of the urging mechanism 12a of the bobbin case delivery mechanism 2 is brought into contact with the protruding piece 12e disposed on the bobbin case delivery mechanism 2 side, and the release piece 12b is released to automatically The urging mechanism 12a is configured to function.
Further, the release piece 12b slides on the magazine 12, and a slit 12c for accommodating the bobbin case B in the magazine 12 with the tip of the lower thread S pulled out from the magazine 12 and a projection of the bobbin case B are provided. A slit 12f that prevents the rotation of the bobbin case B accommodated in the magazine 12 is formed.
In addition, the magazine 12 is mounted on the magazine 12 so as not to rotate (the bobbin case B accommodated in the magazine 12 is sent out toward the hook K in a positioned state without rotating). 2 guide pins 12d for projecting so as to sandwich the slit 12c.
A guide groove 11 a that guides the two guide pins 12 d projecting from the magazine 12 is formed in the accommodating portion main body 11.
Further, the magazine 12 is provided with a locking piece 12h for preventing the release piece 12b from malfunctioning when the magazine 12 is stored or transported (this locking piece 12h is the magazine 12). When the release piece 12b comes into contact with the protruding piece 12e and the locked state is released, the contact piece 11b comes into contact with the storage body 11 and moves from the locking position of the release piece 12b. And make sure that function is released.)

In accommodating a plurality of bobbin cases B around which the bobbin thread S is wound around the magazine 12, it is desirable to interpose a spacer SP between the bobbin cases B.
Accordingly, it is possible to prevent the unevenness due to the unevenness of the surface of the lock claw Ba or the like of the bobbin case B accommodated in the magazine 12 and to smoothly feed the bobbin case B.

In addition, when a plurality of bobbin cases B around which the lower thread S is wound are accommodated in the magazine 12, the magazine 12 may be accommodated in the magazine 12 as shown in FIG. Using the mounting base 17 formed with an inclined guide groove 17a on which the bobbin case B and the spacer SP can be placed side by side, the bobbin case B and the spacer SP placed side by side on the guide groove 17a are attached to the biasing mechanism 12a. It can be accommodated while being pushed into the magazine 12 against the force.
In this case, a cutter mechanism 18 for trimming the yarn S drawn from the bobbin case B accommodated in the magazine 12 to a predetermined length is provided. The cutter mechanism 18 includes a cutter blade 18a and a swinging member 18b to which a rubber thread holding piece 18c is attached. The cutter mechanism 18 is configured so that the thread S is not pulled out from the bobbin case B by pressing the thread S pulled out from the bobbin case B by the thread pressing piece 18c attached to the swing member 18. By holding the end of the thread S pulled out from the bobbin case B and pulling it down, the thread S is cut by the cutter blade 18a, and the thread S pulled out from the bobbin case B accommodated in the magazine 12 is removed. Trimming to a predetermined length.
Thereby, the operation | work which accommodates the several bobbin case B by which the bobbin thread S is wound up by the magazine 12 can be performed efficiently.

  The bobbin case delivery mechanism 2 that sends out the bobbin cases B accommodated in the magazine 12 attached to the bobbin case accommodation part 1 one by one toward the hook K one by one, a support frame 21 that supports the bobbin case accommodation part 1, It comprises a drive mechanism 22 for moving the bobbin case housing portion 1 to and away from (or swinging) the hook K. In this embodiment, the drive mechanism 22 uses a linear drive source C1 such as an air cylinder. .

As shown in FIG. 19, the lock claw operating mechanism 3 pushes the front surface of the bobbin case B toward the hook K while raising the lock claw Ba of the bobbin case B sent out toward the hook K by the bobbin case delivery mechanism 2. The operation of mounting the bobbin case B to the hook K (see FIGS. 18A to 18D) and the bobbin case B to the hook K while raising the lock claw Ba of the bobbin case B mounted to the hook K In this embodiment, a linear motion drive source C2 such as an air cylinder is used as the drive mechanism, and the linear motion drive source is used. The movable portion 32 reciprocates by C2, a leaf spring 33 having a proximal end attached to the movable portion 32, and a lock claw operating piece 34 formed by processing the upper portion of the leaf spring 33.
Thereby, in the operation of mounting the bobbin case B to the hook K, the front surface of the bobbin case B is pressed toward the hook K by the urging force of the leaf spring 33, while the bobbin case B is pulled out from the hook K. In the operation of detachment, the structure of the drive mechanism can be simplified by pulling out the bobbin case B from the hook K by bending the leaf spring 33.

By the way, in this embodiment, the lock claw operation piece 34 of the lock claw operation mechanism 3 and the moving part 23 by the bobbin case delivery mechanism 2 are connected by the rope W, and the leaf spring 33 is moved by moving the moving part 23. Is bent.
Thereby, the drive mechanism of the lock claw operating piece 34 can be substituted by the bobbin case delivery mechanism 2 and the structure can be simplified.
In addition, a groove 23b for attaching / detaching the rope W is formed in the attachment piece 23a of the rope W of the moving part 23, thereby enabling the front surface of the hook K to be opened and improving workability during maintenance. To be able to.

A chute 4 is disposed below the front surface of the hook K.
Thus, the lock claw operation mechanism 3 receives the spacer SP, which has been pulled out of the hook K and separated from the bobbin case B and the magazine 12, by the chute 4 and collects it in one place.
As shown in FIG. 24, the chute 4 is composed of a fixed chute 41 disposed immediately below the front surface of the hook K and a movable chute 42 connected thereto, and the fixed chute 41 side of the movable chute 42 is a swing shaft 42b. A movable portion 42a that swings around the center of the fixed chute 41, and a gate portion 42c that swings around the swing shaft 42d.
As a result, the movable portion 42a of the movable chute 42 is bent downward to widen the space below the front surface of the hook K, the lower thread S is cut, and the bobbin case B attached to the hook K is hand-held. In addition to making it possible to easily perform operations such as individual adjustment in the work, the bobbin case B and the spacer SP can be discharged by opening the gate portion 42c of the movable chute 42.
In addition, a cushioning material such as felt 43 is attached to the surface of the chute 4 (in this case, by appropriately forming undulations on the bottom surface of the chute 4, the speed at which the bobbin case B and the spacer SP slide down is reduced. 4), and a cushioning material 44 is disposed on the lower surface of the fixed chute 41.

Next, an automatic replacement method of the bobbin case B using the sewing machine lower thread changing device will be described.
When the bobbin thread S wound around the bobbin in the bobbin case B attached to the hook K is lost, the lock claw operating piece 34 of the lock claw operating mechanism 3 is connected to the bobbin case B attached to the hook K. Is inserted between the lock claw Ba and the lock claw Ba of the bobbin case B is raised, and the moving part 23 of the bobbin case delivery mechanism 2 is moved to be connected to the moving part 23 by the rope W. The leaf spring 33 is bent through the lock claw operating piece 34, and the bobbin case B is pulled out from the hook K and detached.
The bobbin case B detached from the hook K is received by the chute 4 and collected in one place.
Next, the bobbin case housing portion 1 in which the magazine 12 housing a plurality of bobbin cases B around which the bobbin thread S is wound is brought close to the hook K by the bobbin case delivery mechanism 2. By operating the operation piece 16c of the locking member 16 by the lever SOa of the rotary solenoid SO1, the locking member 16 is deformed, whereby the outlet side of the storage unit main body 11 is opened, and the bobbin stored in the magazine 12 The case B is sent out toward the hook K.
At this time, the spacer SP housed in the magazine 12 together with the bobbin case B falls, is received by the chute 4 and collected in one place.
The bobbin case B sent out toward the hook K is temporarily held in the hook K. In this state, the lock claw operating piece 34 of the lock claw operating mechanism 3 is placed between the bobbin case B and the lock claw Ba. The bobbin case B is completely attached to the hook K by raising the lock claw Ba of the bobbin case B by being inserted into the hook and pressing the front surface of the bobbin case B toward the hook K by the urging force of the leaf spring 33. To do.
As a result, the installation of the new bobbin case B in which the bobbin around which the lower thread S is wound is accommodated in the hook K is completed, and sewing and embroidery can be performed.
Hereinafter, when the bobbin thread S wound around the bobbin in the bobbin case B attached to the hook K is lost, the same operation is repeated to remove the bobbin case B attached to the hook K from the magazine. 12 can be replaced with a bobbin case B in which the lower thread S accommodated in 12 is wound.

  As described above, this bobbin thread exchanging device is configured such that a plurality of bobbin cases B around which the bobbin thread S housed in the bobbin case housing portion 1 is wound are sequentially transferred to the hook by the bobbin case delivery mechanism 2 one by one. The front of the bobbin case B is moved to the hook K while the lock claw operating mechanism 3 raises the lock claw Ba of the bobbin case B sent to the hook K by the bobbin case sending mechanism 2. The operation of attaching the bobbin case B to the hook K by pressing toward the hook K and the operation of pulling out the bobbin case B from the hook K while raising the lock claw Ba of the bobbin case B attached to the hook K are performed. Therefore, the operation mechanism of the lower thread exchanging device can be configured easily.

As mentioned above, although the bobbin thread changing device of the sewing machine of the present invention has been described based on the embodiments thereof, the present invention is not limited to the configurations described in the above embodiments, and the configurations described in the respective embodiments are appropriately described. The configuration can be changed as appropriate within a range not departing from the gist, such as a combination.
Further, each component of the lower thread exchanging device of the sewing machine of the present invention can be made of a synthetic resin, if necessary, in addition to a metal such as iron, stainless steel, and aluminum unless otherwise specified.

  The bobbin thread changing device of the sewing machine according to the present invention can simplify the operating mechanism of the bobbin thread changing device, so that a plurality of sewing machines such as a single-head sewing machine having a single sewing head such as a sewing machine or an embroidery sewing machine can be used. It can be suitably used for any of the multi-head type sewing machines equipped with a sewing head, and can be easily incorporated into existing sewing machines.

It is a top view which shows one Example of the bobbin thread changing apparatus of the sewing machine of this invention. It is the same front view. It is the left side view. It is a left view which shows the deformation | transformation Example of the lower thread replacement | exchange apparatus of the sewing machine of this invention. It is a left view which shows the deformation | transformation Example of the lower thread replacement | exchange apparatus of the sewing machine of this invention. The lock nail | claw operation mechanism is shown, (A) is a top view of the principal part, (B) is a perspective view. A bobbin case accommodating part is shown, (A) is a left view, (B) is a front view, (C) is a rear view. The bobbin case accommodation part is shown, (A) is a rear view of the main part, (B) is a left side view of the main part, and (C) is a bottom view of the main part. It is a rear view of the principal part of a bobbin case accommodating part. The modification example of a bobbin case accommodating part is shown, (A) is a rear view of the principal part, (B) is a right view of the principal part. The modification example of a lock claw operation mechanism is shown, (A) is a front view and (B) is a top view. The modification Example of a lock nail | claw operating mechanism is shown, (A) is a right view, (B) is a perspective view. (A) is a right side view, (B) is a front view, (C) is a plan view, (D) is a perspective view, (E) is a perspective view of a lock plate, (F), (G) These are explanatory drawings of a spacer. The magazine is shown, (A) is a plan view, (B) is a front view of the pressing member, (C) is a right side view of the pressing member, and (D) is a perspective view of the pressing member. A bobbin case accommodating part is shown, (A) is a left view of the principal part, (B) is a top view of the principal part. A chute | shoot is shown, (A) is a perspective view, (B) is a front view, (C) is sectional drawing. The mounting base is shown, (A) is a plan view, (B) is a front view of the cutter mechanism, (C) is a right side view of the cutter mechanism, and (D) is a perspective view. (A)-(D) are explanatory drawings which show operation which attaches a bobbin case to a shuttle, and (E)-(F) shows operation which pulls out a bobbin case attached to a shuttle from a hook, and makes it detach, respectively. . It is a front view which shows the deformation | transformation Example of the lower thread replacement | exchange apparatus of the sewing machine of this invention. It is the same right view. It is a perspective view which shows the principal part. A bobbin case accommodating part is shown, (A) is a right view, (B) is a front view, (C) is a rear view. The magazine is shown, (A) is a right side view, (B) is a plan view, and (C) is a rear view. A chute | shoot is shown, (A) is a perspective view, (B) is a top view. FIG. 2A is a plan view, FIG. 2B is a right side view, FIG. 3C is a front view showing a state before the lower thread is held in the thread holding part, and FIG. The front view which shows the state which hold | maintained the thread | yarn, (E) is the same rear view.

Explanation of symbols

B Bobbin Ba Lock claw F Sewing machine body K Hook P Mounting plate S Lower thread SP Spacer W Strip 1 Bobbin case housing part 11 Housing part body 12 Magazine 13 Guide member 14 Operation rod 15 Locking member 16 Locking member 17 Mounting base 18 Cutter mechanism 2 Bobbin case delivery mechanism 21 Support frame 22 Drive mechanism 23 Moving part 3 Lock claw operating mechanism 31 Power conversion mechanism 32 Moving part 33 Leaf spring 34 Lock claw operating piece 4 Chute

Claims (4)

A bobbin case accommodating portion capable of accommodating a plurality of bobbin cases around which a bobbin thread is wound, and a bobbin case sending mechanism for sequentially feeding the bobbin cases accommodated in the bobbin case accommodating portion one by one toward the hook The operation of attaching the bobbin case to the hook by pushing the front surface of the bobbin case toward the hook while raising the lock claw of the bobbin case sent toward the hook by the bobbin case feeding mechanism, Pull the bobbin case from the hook while causing a locking pawl of the bobbin case which are, a lower thread exchange device of a sewing machine comprising a locking pawl operating mechanism for performing an operation to disengage the spring the locking pawl operating piece of the locking pawl operating mechanism The front surface of the bobbin case is pressed toward the hook by the biasing force of the spring and the bobbin case is bent by bending the spring. As it is drawn from, and characterized by a moving portion by the lock pawl operating piece and bobbin case delivery mechanism of the locking pawl operating mechanism connected by rope, and to deflect the spring by moving the movable portion The lower thread changing device of the sewing machine. 2. A bobbin case accommodation unit according to claim 1 , wherein a magazine containing a plurality of bobbin cases around which bobbin threads are wound is mounted on the bobbin case housing part. 3. The sewing machine according to claim 1 , wherein a plurality of bobbin cases around which bobbin threads are wound are accommodated in a bobbin case accommodating portion with a spacer interposed between the bobbin cases. Yarn changing device. Claims by integrating the constituent members of the lower thread exchange device of a sewing machine to the mounting plate disposed, characterized in that the lower thread exchange device of a sewing machine to attach detachably to the sewing machine body via a mounting plate The bobbin thread changing device of the sewing machine according to 1, 2 or 3 .

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