JP2002172285A - Sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewing machine capable of facilitating insertion of a rubber tape at the start of sewing, allowing an operator to confirm a sewing position in an ordinary posture during sewing, and reducing a no-tension part of the rubber tape at the end of sewing. SOLUTION: A belt-like material feeding means 22 is mounted vertically movably on the front of a sewing machine body 21. In the belt-like material feeding means 22, the rubber tape T is nipped by a large roller 30 and a small roller 31, and the larger roller 30 is rotated by a stepping motor 35 to feed the rubber tape T. Right under the larger roller 30 and the small roller 31, a measuring device 32 is provided. The rubber tape T fed out through the measuring device 32 is inserted in a belt-like material guide port 50 of a presser foot 27. The belt-like material feeding means 22 is driven to displace between the close position where a feed part 33 comes close to the presser foot 27 and the separate position where they are separated from each other by a cylinder 36 for moving the belt-like material feeding means 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to briefs, swimwear,
The present invention relates to a sewing machine for attaching rubber such as jogging pants.

[0002]

2. Description of the Related Art FIG. 10 is a perspective view showing a conventional sewing machine 1 for applying a rubber to a waist of a brief or jogging pants. The sewing machine 1 includes a sewing machine main body 8, which is an overlock sewing machine, and a belt supply unit 2 for supplying a belt such as a rubber tape T. The belt-shaped material supply means 2 has a large roller 4 and a small roller 5 in a supply section. The large roller 4 is driven to rotate by a stepping motor 6 via a timing belt 7, and the small roller 5 is repelled by the large roller 4. And a driven rotation. Such a strip supply means 2 is provided above the needle plate 10, and a strip feeding device (not shown) is provided above the sewing machine 1. This belt feeding device rotatably supports a reel around which a rubber tape T, which is a belt, is wound. The rubber tape T unwound from the reel is supplied with a large roller 4 and a small roller 4 of the belt feeding means 2. 5 and is supplied toward the lower needle plate 10 by the large roller 4 being rotationally driven.

[0003] A presser foot 11 is arranged on the needle plate 10, and the presser foot 11 is provided with a band-shaped material guide port 13 into which a rubber tape T supplied from the band-shaped material supply means 2 is inserted. The rubber tape T inserted into the belt-shaped object guide port 13 is sent out below the presser foot 11.

Further, a feed groove (not shown) extending in the cloth feed direction A is formed in the needle plate 10, and a feed dog is inserted into the feed groove, and the feed tooth is inserted in the feed groove in the cloth feed direction. By the elliptical movement, the cloth sandwiched between the presser plate 14 of the presser foot 11 and the needle plate 10 is sent out in the cloth feed direction A.
In addition, a knife device (not shown) for cutting the fed fabric and aligning the edges of the fabric is provided on the side of the needle plate 10.

When the rubber tape T is sewn, the operator presses the fabric with the presser foot 11, and presses the rubber tape T inserted into the belt-like material guide opening 13 of the presser foot 11.
The sewing machine 1 is driven and sewing is performed. When the sewing machine is driven, the side of the cloth is fed while being cut by the scalpel device, the rubber tape T is supplied, and the rubber tape T can be sewn along the edge of the cloth. Also,
By making the feed speed of the stepping motor 6 for supplying the rubber tape T slower than the feed speed of the cloth, the rollers 4,
A certain tension can be applied to the rubber tape T from 5 to the needle drop, and the rubber tape can be sewn with the tension applied.

[0006] In this manner, the rubber tape T is sewn along the periphery of the cloth, and when the sewing of the rubber tape T is completed around the waist portion, the scalpel disposed below the large roller 4 and the small roller 5 is sewn. The rubber tape T is cut by the device 3. The operator performs such a rubber attaching operation continuously.

[0007]

The belt-like material supply means 2 comprises:
The supply unit 15 including the large roller 4, the small roller 5, and the knife device 3 is mounted at a position so as to be as close as possible to the presser foot 11. For this reason, the supply section 15 completely covers the portion where the cloth is cut and the needle drop section, and it is very difficult for the operator to see the cutting margin of the sewing place and the position of the cloth when sewing the cloth. It has become.

Therefore, unlike ordinary sewing, the operator needs to change the position of the head and look at the sewn portion. Due to this act, there are problems that the operator is more tired than usual sewing, and it is difficult to cut the sewing part accurately.

In order to solve such a problem, it is conceivable to raise the mounting position of the belt-like material supply means 2. However, when the rubber tape T3 is inserted into the belt-like material guide opening 13 of the presser foot 11 at the start of sewing. In addition, the distance between the supply unit and the presser foot 11 becomes longer, and it becomes difficult to accurately insert the rubber tape T into the strip guide 13 of the presser foot 11.

At the end of sewing, the rubber tape T is cut by the knife device 3. At this time, if the supply portion is far from the presser foot 11, the length of the rubber which becomes tensionless at the end of sewing increases, and the finished product is finished. Gets worse. That is, tension is not applied to the end portion of the sewing.

An object of the present invention is to make it easier to insert a rubber tape at the start of sewing, to allow an operator to check the sewing position in a normal posture during sewing, and to reduce the tensionless portion of the rubber tape at the end of sewing. Provide a sewing machine that can be used.

[0012]

According to a first aspect of the present invention, there is provided a belt supplying means for supplying a belt from a supply section above a presser foot of a sewing machine main body. In the sewing machine, the cloth is fed from the supply unit of the band supply means onto the cloth, and the cloth and the band are overlapped and sewn. Is provided so as to be movable between a proximity position close to the presser foot and a separation position separated from the presser foot.

According to a second aspect of the present invention, there is provided a driving source for moving at least a supply portion of the belt-like material supply means from a proximity position to a separation position, and at least a supply portion of the belt-like material supply means at a close position at the time of starting sewing. And control means for controlling the drive source so as to be arranged at a separated position during sewing and to be arranged at a close position before sewing is completed.

According to the third aspect of the present invention, the separation position is:
It is located above the proximity position, and at least the supply section of the strip supply means moves up and down.

According to the present invention, at least the supply portion of the belt-like material supply means is provided so as to be movable up and down, and at the start of sewing, the supply portion is arranged at a position close to the presser foot and the needle drop portion. In addition, the work of inserting the strip under the presser foot is easy. In addition, during sewing, the supply unit is disposed at a position separated from the needle drop unit, so that the operator can check the sewing position in a normal posture, and before the sewing is completed, the supply unit is turned off. Since it is placed again in the proximity position,
When the belt is a rubber tape, it is possible to prevent tensionlessness near the end portion.

[0016]

FIG. 1 is a perspective view of a sewing machine 20 according to an embodiment of the present invention. The sewing machine 20 is provided with a belt-like material supply means 2 on a sewing machine main body 21 which is an overlock sewing machine.
In the present embodiment, a rubber tape T is supplied as a belt-like material, and is used, for example, when a waist portion such as briefs or jogging pants is rubberized.

A needle plate 26 is horizontally disposed on the cylinder bed 25 of the sewing machine main body 21, and a presser foot 27 is disposed on the needle plate 26. The presser foot 27 is attached to the front end of the presser arm 28, and the rear end of the presser arm 28 is
, And the presser arm 28 is spring-biased downward. The needle plate 26 below the presser foot 27 is formed with a needle drop portion (not shown) where the needle drops, and a feed groove (not shown) extending in the cloth feeding direction A. There is provided a feed dog (not shown) which performs an elliptical movement in synchronization with the reciprocation of the needle and feeds the cloth on the needle plate 26 in the cloth feed direction A. Further, a scalpel device (not shown) is provided on the side of the needle plate 26 for cutting and trimming the edge of the cloth to be fed.

On the front surface of the sewing machine main body 21, a belt-like material supply means 22 is attached. The belt supply unit 22 includes a supply unit 33 including a large roller 30, a small roller 31, and a scalpel device 32, and a stepping motor 35 as a driving source. The belt-like material supply means 22 is supported so as to be movable up and down, and is moved up and down by a belt-like material supply means moving cylinder 36 fixed to the sewing machine main body 21.

FIG. 2 is a front view of the belt-like material supply means 22, and FIG. 3 is a left side view. The stepping motor 35 is held by a motor mount 40, and the motor mount 40 is mounted on the roller device mount 41. A timing pulley 42 is fixed to an output shaft of the stepping motor 35, and a timing pulley 44 rotates via a timing belt 43. The timing pulley 44 is a large roller 3
0 via a shaft (not shown). Thus, the large roller 30 can be driven to rotate by the stepping motor 35.

The small roller 31 is rotatably supported by a roller link 45. The small roller 31 is
It comes into contact with the large roller 30 resiliently. Further, the operator presses the roller pushing lever L connected to the roller link 45.
By pressing, the roller link 45 is pulled up to the front, and the small roller 31 can be separated from the large roller 30. Therefore, to set the rubber tape T,
With the small roller 31 separated, the rubber tape T is inserted into the gap between the large roller 30 and the small roller 31 is returned.

Since the outer peripheral surfaces of the large roller 30 and the small roller 31 are knurled, the rubber tape T can be securely held between the large roller 30 and the small roller 31. The large roller 30 is connected to a stepping motor 35.
As the small roller 31 is driven to rotate, the rubber tape T sandwiched between the large roller 30 and the small roller 31 is sent downward.

Immediately below the large roller 30 and the small roller 31, a knife device 32 is mounted. The knife device 32 is composed of a fixed knife 52 and a moving knife 53, between which the rubber tape T passes and is sent out. At the end of sewing, the moving tape 53 can be operated to cut the rubber tape T. . The moving knife 53 is driven by a cylinder (not shown). A band guide 50 is formed in the presser 27, and the rubber tape T sent out through the scalpel device 32 is inserted into the band guide 50 and guided to the lower surface of the presser 27.

Such a band-like material supply means 22 is provided in such a manner that the supply portion 33 is positioned close to the presser foot 27,
Is attached to the sewing machine main body 21 so as to be movable over a separation position separated from the sewing machine main body 21. FIG.
Is a front view showing a state at a close position, and FIG.
It is a front view showing the state where belt-like material supply means 22 has moved upward and is in a separated position.

The roller device mounting base 41 of the belt-like material supply means 22 is provided with a pair of guide plates 5 fixed to the sewing machine main body 21.
It is arranged between 5,56. A guide groove 61 is formed in the guide plate 55, and a guide piece 57 that fits into the guide groove 61 is attached to the motor mount 40. Above the strip supply means 22, a strip supply means moving cylinder 36 is provided.
It is attached to the sewing machine main body 21 via the cylinder attachment plate 60. The band supply means moving cylinder 36 is mounted with the cylinder rod 59 facing down.
Is connected to the roller device mounting base 41. With such a configuration, the belt-like material supply means moving cylinder 36
Is operated, and the roller device mounting base 41 is pulled up, whereby the entire belt-like material supply means 22 moves upward, and the supply portion 33 can be disposed at a separated position separated from the presser foot 27. Further, by moving the roller device mounting base 41 downward with the belt-like material supply means moving cylinder 36, the entire belt-like material supply means 22 is lowered, and
3 can be arranged at a close position close to the presser foot 27.

As shown in FIG. 6, when the belt-like material supply means 22 is in the close position, the supply portion 33 is in the position close to the presser foot 27. The operation of inserting the object into the object guide port 50 can be easily performed.

As shown in FIG. 7, when the belt-like material supply means 22 is at the separated position, the supply section 33 is separated from the presser foot 27 and the needle drop section, and the operator places the needle drop section in a normal posture. You can see. That is, during the sewing operation, the belt-shaped material supply means 22 is disposed at the separated position,
The operator can secure the visibility of the needle drop part,
It is possible to check the sewing work such as the cut allowance of the cloth during the sewing work and the position to which the sewing work is progressing.

At the end of sewing, the rubber tape T is cut by the scalpel device 32. If the band-shaped material supply means 22 is cut in a state where the belt-shaped material supply means 22 is arranged at the separated position, the non-tensioned portion of the rubber tape T becomes long. . Therefore,
By arranging the belt-like material supply means 22 at a close position immediately before the end of sewing, the non-tension part can be shortened.

In this embodiment, the separation position is assumed to be approximately 1.5 cm above the proximity position.

FIG. 8 is a control block diagram of the sewing machine 20. The sewing machine 20 is controlled by the control means 65 to move the band-shaped material supply means moving cylinder 36, the sewing machine rotation motor 68, the stepping motor 35 of the band-shaped material supply means 22, the presser-lifting cylinder 66 for raising and lowering the presser foot 27, and the female device for cutting the rubber tape T. It controls the 32 moving knife drive cylinders 67. The control means 65 receives the input signals S1 to S4
Control in response to. The signals S1 to S3 are output from a pedal (not shown) operated at the foot of the operator, and the depression signal S1, the neutral signal S2, and the return signal S
3. The signal S4 is a knife device operation signal, and is output from, for example, a knee switch (not shown) operated by the operator's knee.

Next, a control operation of the sewing machine 20 will be described with reference to a timing chart of FIG. Time t
0 indicates a state when the previous sewing operation is completed and the next sewing operation is started. At this time, the pedal is in the depressed position, the presser-lifting cylinder 66 is in the raised position, and the presser foot 27 is in the lifted state. Therefore, it is possible to take out the sewn cloth and set a new cloth to be sewn on the needle plate 26.

Further, the sewing machine rotating motor 68 is turned off and the needle stops, and
Is in the lower position, the belt-like material supply means 22 is in the close position, the knee switch is turned off, and the moving knife drive cylinder 6 is turned off.
7 is in an open state. In addition, the stepping motor 35
When the pedal is depressed, the rubber tape is fed by a predetermined length, and the rubber tape T is inserted into the band-shaped object guide port 50 of the presser foot 27.

When the setting of the fabric and the attachment of the rubber tape T are completed, the operator returns the pedal to the neutral position (time t1). Then, in response to the neutral signal S2 from the pedal, the control means 65 lowers the presser lifting cylinder 66 to the lowered position. As a result, the presser foot 27 presses the rubber tape T on the needle plate 26 from above.

Next, the operator depresses the pedal to the depressed position (time t2) to start the sewing operation. Then, the stepping-in signal S1 is input to the control means 65, and in response to this, the control means 65 rotates the sewing machine rotation motor 68 to drive the sewing machine, and switches the band-shaped material supply means moving cylinder 36 to the upper position. The strip-shaped material supply means 22 is arranged at a separated position. At the same time, the stepping motor 35 of the belt-like material supply means 22 is driven.
Thereby, the rubber tape T is supplied together with the cloth,
Rubber tape is sewn on the fabric and sent out. At this time, since the belt-shaped material supply means 22 is arranged at the separated position, the operator can perform the sewing operation while confirming the sewing position in the normal posture.

In this manner, the rubber is sewn on the waist, and immediately before the sewing is completed, the operator turns on the knee switch.
(Time t3). Then, the female device operation signal S4
In response to the above, the control means 65 moves the belt-like material supply means 22 to the close position with the belt-like material supply means moving cylinder 36 at the lower position, stops the stepping motor 35, stops the feeding of the rubber tape, and drives the moving knife. The cylinder 67 is operated to cut the rubber tape T. In this way, since the rubber tape T is cut after the belt-shaped material supply means 22 is arranged at the close position, the tensionless portion can be shortened. When the knee switch is returned and turned off (time t4), the moving knife 53 returns to its original position, and the knife device 32
Will be open again.

When the rubberization is completed and the operator returns the pedal to the neutral position (time t5), a neutral signal S2 is input to the control means 65, and the control means 65 responds to this by turning the sewing machine rotation motor 68. Stop.

Further, when the operator returns the pedal to the depressed position, the depressed signal S3 is input to the control means 65, and in response, the control means 65 raises the presser lifting cylinder 66. As a result, the presser foot 26 rises, and the operator removes the fabric after the rubber attachment,
A new dough is set, and the above-described series of operations is repeated. At this time, the stepping motor rotates, the rubber tape T is supplied by a predetermined amount, and the rubber tape T is inserted into the band-shaped object guide port 50 of the presser foot 27.

In the embodiment described above, the knife device operation signal S4 is configured to be output from the knee switch. However, the present invention is not limited to this. For example, a needle operation counter is provided, and the number of needle operations from the start of sewing is counted. Alternatively, the female device drive signal S4 may be output to the control means 65 when the predetermined number of hand movements corresponding to the end of the rubber attachment is counted. Thus, the rubber can be cut when the rubber sewing is automatically completed without any operation by the operator.

The present invention is not limited to this, and a fabric sensor including an optical sensor may be used. The fabric sensor is
For example, it has a light-emitting portion that emits light on the fabric and a light-receiving portion that is provided below the needle plate and receives light that passes through a portion where the rubber overlaps the fabric, and the rubber attachment is completed based on the amount of received light. Is detected. In the middle of rubber application, only one piece of rubber is superimposed on the cloth, and when the waist part is rotated around, the rubber is in a state of being superimposed twice. Therefore,
Based on the difference between the amount of light received when a single piece of rubber is used and the amount of light received when the rubber is doubled, it can be determined whether or not the rubber application has been completed. With such a cloth sensor,
Even if the operator does not operate, it is possible to automatically determine the end of rubber attaching and cut the rubber tape.

In the present embodiment, the belt-like material supply means 22
The whole is configured to move up and down to move between the proximity position and the separation position. However, the present invention is not limited to this, and only the supply unit 33, that is, only the large roller 30, the small roller 32, and the knife device 32 are separated from the proximity position. You may comprise so that it can be moved between positions. Thereby, the configuration of the driving unit can be reduced in size.

Although the separation position is above the proximity position,
As long as the position where the needle drop portion can be confirmed by the operator, the position is not limited to the upper position, but may be moved forward, for example.

The drive source of the belt-like material supply means is a cylinder, but the invention is not limited to this. An electric motor may be used, and the belt-like material supply means may be moved manually. Also,
The band is not limited to the rubber tape, but may be a cloth tape or the like.

[0042]

As described above, according to the present invention, at least the supply portion of the strip-shaped material supply means is provided so as to be movable up and down, and at the start of sewing, the supply portion is arranged at a position close to the needle drop portion. Therefore, the work of inserting the belt-like material under the presser foot is easy. In addition, during sewing, the supply unit is disposed at a position separated from the needle drop unit, so that the operator can check the sewing position in a normal posture, and before the sewing is completed, the supply unit is turned off. Since the belt-shaped object is a rubber tape again, it is prevented from becoming tensionless near the end portion because the belt-shaped object is a rubber tape again.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an entire sewing machine 20 according to an embodiment of the present invention.

FIG. 2 is a front view of the belt-like material supply means 22.

3 is a left side view of the belt-like material supply means 22. FIG.

FIG. 4 is a front view showing a state in which the belt-shaped material supply means 22 is at a close position.

FIG. 5 is a front view showing a state where the belt-shaped material supply means 22 is at a separated position.

FIG. 6 is a left side view illustrating a state in which a supply unit 33 of the belt-shaped material supply unit 22 is at a close position.

FIG. 7 is a left side view showing a state in which a supply unit 33 of the belt-shaped material supply unit 22 is at a separated position.

FIG. 8 is a control block diagram of the sewing machine 20.

FIG. 9 is a timing chart of the control means 65.

FIG. 10 is a perspective view showing an entire configuration of a conventional sewing machine 1.

[Explanation of symbols]

 REFERENCE SIGNS LIST 20 sewing machine 21 sewing machine main body 22 belt supply means 26 needle plate 27 presser foot 30 large roller 31 small roller 32 female device 33 supply unit 35 stepping roller 36 belt supply means moving cylinder 65 control means

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 3B150 AA08 AA22 BA03 BA04 BB04 CB06 CC01 CE01 CE03 CE05 CE23 CE27 EH01 EH06 EH17 JA07 JA13 LA32 LA82 LA84 LB02 NA31 NA67 NA78 NB12 NC06 NC18 QA04 QA06

Claims (3)

[Claims] 1. A band-like material supply means for supplying a band-like material from a supply unit is provided above a presser foot of a sewing machine main body, and sends out the cloth while sandwiching the cloth between a needle plate and a presser foot.
In a sewing machine that supplies a band-shaped material onto a cloth from a supply unit of the band-shaped material supply unit and sews the cloth and the band-shaped material, at least a supply unit of the band-shaped material supply unit is in a proximity position close to the presser foot. A sewing machine provided so as to be movable between a presser foot and a separated position separated from the presser foot. 2. A driving source for moving at least a supply portion of the belt-like material supply means from a proximity position to a separation position; and at the start of sewing, at least the supply portion of the belt-like material supply means is arranged at a proximity position, and during sewing, 2. The sewing machine according to claim 1, further comprising control means for controlling the driving source so as to be disposed at a separated position and to be disposed at a close position before sewing is completed. 3. The sewing machine according to claim 1, wherein the separation position is located above the proximity position, and at least a supply unit of the belt-like material supply means moves up and down.