JPH0658877U - Tape sewing machine - Google Patents

Abstract

(57) [Abstract] [Purpose] When automatically sewing the reinforcing tape to the edge of the cloth using the overlock sewing machine, select the tape from the beginning of the cloth or from the middle of the cloth, The tape can be supplied for a predetermined length, and the tape tip can be reliably aligned and cut with the back end of the cloth, so that the tape can be sewn with good finish. [Structure] A tubular tape guide 14 is provided at an upper side portion in front of the presser foot 8 of the sewing machine, and the tubular tape guide 14 is retracted laterally from the tape feeding operation position close to the presser foot 8 and the position. An air cylinder 16 for moving the tape T to the standby position is provided, and a tape holding device 19 capable of temporarily holding the tape T in the tubular tape guide 14 is provided. An air nozzle 17 that blows downward under the presser foot 8 is provided to control the holding / releasing operation of the tape T and the movement of the tubular tape guide 14 in relation to the number of needle movements of the sewing machine.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention is applied to an overlock sewing machine when, for example, when a shoulder portion is sewn when sewing the front body and the back body of underwear and the like, a tape for stretch prevention is automatically sewn on the edge of the sewn portion. The present invention relates to a tape sewing device used by being equipped.

[0002]

[Prior art]

 As a tape sewing device for relatively flexible tape such as rubber tape, conventionally, the tape supplied from above is placed above the side of the overlock sewing machine before the presser foot and below the presser foot of the overlock sewing machine. It is known that a tubular tape guide is provided for guiding.

[0003]

[Problems to be solved by the device]

 In the above-mentioned tape sewing machine, the tape is firm and easy to handle, and if a guide rod or the like is used, the tape can be easily guided onto the cloth under the presser foot, but the tape is not stretchable. In the case of a flexible tape such as, it is difficult to handle, and there was a problem that the tip of the tape was distorted and could not be guided straight. In addition, when the tape is cut in the middle of the cloth or at the end of sewing, even if it is cut by the cloth edge cutting knife of the sewing machine, the tape is flexible and the tape length becomes uneven, and the hand after sewing is sewn. There was a problem that it was necessary to cut and align in the work.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to reliably and accurately supply a predetermined length of tape from an arbitrary position such as a sewing start portion of a cloth or a middle portion of the cloth to finish the tape. It is an object of the present invention to provide a tape sewing device that can be sewn well.

[0005]

[Means for Solving the Problems] To achieve the above object, the present invention provides a knife for cutting a cloth edge, a needle plate, a presser foot, and a feed dog for feeding cloth on the needle plate in cooperation with the presser foot. A tape provided with an overlock sewing machine equipped with an overlock sewing machine, and a tubular tape guide arranged laterally above the presser foot and for guiding a tape supplied from above to the needle drop portion of the overlock sewing machine. In the sewing device, a guide drive device for moving the tubular tape guide in a direction intersecting with the cloth feeding direction between a tape supply operating position facing the needle drop portion and a standby position retracted from the operating position. A tape holding device attached to the tubular tape guide and performing a holding and releasing operation by a driving means, and an air nozzle provided near the outlet of the tubular tape guide and ejecting air toward the tape. It is equipped with a cloth detection sensor which is arranged above the needle plate to detect the presence or absence of cloth, and a hand movement counter which counts the number of movements of the sewing machine needle based on the signal of the cloth detection sensor, and starts sewing the tape. At the time, with the tubular tape guide in the operating position and holding the tape with the tape holding device, the tip of the tape is guided under the presser foot by the air blown from the air nozzle, and the tape is held while the tape is being sewn in. At the end of sewing the tape, the tape is held by the tape holding device and the tubular tape guide is moved to the standby position according to the number of stitches moved after the cloth detection sensor detects that there is no cloth. It is characterized in that the tape is cut with a cloth edge cutting knife.

Further, as an example of an embodiment of the above-mentioned configuration, the vertical movement of the presser foot and the tape holding / releasing operation of the tape holding device are interlocked.

[0007]

[Action]

 According to the tape sewing device having the above configuration, when the cloth is placed on the needle plate of the overlock sewing machine, the presser foot descends in response to the signal from the cloth detection sensor, and the cloth is put on the needle plate by the presser foot. Simultaneously with the pressing, the tape holding device attached to the tubular tape guide moved to the tape feeding working position is held and released. When the sewing machine starts to operate in this state, the tip of the tape hanging from the tubular tape guide is inserted and guided by the air ejected from the air nozzle onto the edge of the cloth under the presser foot, and the tape extends over the entire length of the cloth. Is sewn over. Then, after sewing for a predetermined number of stitches, the tubular tape guide moves to the standby position, and at the time of this movement, it moves between the portion sewn into the fabric and the tape feed-out port of the tubular tape guide. The boop portion is cut with a cloth cutting knife, and the cut tape is sewn over the remaining rear end of the cloth.

At the beginning of sewing, the tubular tape guide that holds the tape by the holding operation of the tape holding device is moved to the standby position, and after the predetermined hand movement, the operation of the machine is stopped to In addition to moving the tape guide to the tape feeding position, the tape holding device is held and released, and air is ejected from the air nozzle to eject the tip of the tape hanging from the tubular tape guide. At the same time that the tape is guided below the presser foot onto the fabric, the presser foot is lowered to activate the sewing machine, so that the tape fed from the tubular tape guide is sewn onto the upper surface at an arbitrary position in the middle of the cloth. Be done. In this case also, in the same manner as above, the sewing machine stops operating after the predetermined movement of the needle, and the tubular tape guide moves to the standby position. The tape portion advancing between the tape guide and the tape feed-out opening is cut with a cloth edge-cutting knife, and the cut tape is sewn evenly over the remaining rear end of the cloth.

When the vertical movement of the presser foot and the tape holding / release operation of the tape holding device are interlocked with each other, the sewing start position of the tape fed from the tubular tape guide to the cloth is accurately controlled. It is possible.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view of a main part of an overlock sewing machine equipped with two needles 1 and 1A equipped with a tape sewing device, and a needle plate 3 is provided at a position corresponding to the sewing needles 1 and 1A of a cross plate 2. It is fitted.

The presser foot 8 arranged so as to face the needle plate 3 is a presser foot supported on the sewing machine M on the rear side thereof so as to be vertically swingable via an air cylinder 20 (see FIG. 4). The cloth S on the needle plate 3 is fed backward in cooperation with a feed dog (not shown) which is attached to the tip of the base 11 and moves back and forth through the hole of the needle plate 3. Further, as shown in FIG. 3, the presser foot 8 is formed in a narrow width by notching the right side of the tip end portion thereof, and a tubular tape guide 14 described later can be brought into contact with the notch portion.

Like the general overlock sewing machine, a cloth edge cutting knife 9 (only the upper knife is shown) is provided on the right side of the needle plate 3 and the cloth S is interlocked with the operation of the sewing machine. Before reaching the needle drop portion, the unnecessary edge portion and the tape T described later are cut. Furthermore, above the needle plate 3, an optical cloth detection sensor 10 for detecting the presence or absence of the cloth S supplied on the cross plate 2 is provided.

A tubular tape guide 14 is provided above the needle plate 3 and laterally above the presser foot 8 to guide the needle drop portion of the overlock sewing machine. The tubular tape guide 14 is in the shape of a square gutter that is curved in a U-shape, and the tape T that hangs down from a reel provided above is inserted and fed out from the tape feeding port 14a at the tip. The tubular tape guide 14 is connected to a piston rod 16a of an air cylinder 16 which is disposed on the right side thereof and is fixed to the sewing machine main body M and which serves as a guide drive device, through a bracket 16b. The air cylinder 16 is provided such that its piston rod 16a advances and retreats in the direction of arrow a, which is orthogonal to the cloth feed direction of the sewing machine. By controlling the delivery and suction of air to the air cylinder 16, The tubular tape guide 14 is moved in a direction orthogonal to the cloth feeding direction, and by this movement, the tape feeding port 14a of the tubular tape guide 14 is brought close to the side of the presser foot 8 to the needle drop portion. The position is freely changeable between the opposing tape supply operating position and the standby position retracted from this operating position.

Below the tape delivery port 14a of the tubular tape guide 14, air is blown onto the lower surface of the tape T fed from the tubular tape guide 14 to guide the tape T to a predetermined supply position. An air nozzle 17 is provided. This air nozzle 17 is moved through the air cylinder 12 in the direction of arrow b, which is orthogonal to the cloth feed direction of the sewing machine, so that the position of the air nozzle 17 can be freely changed between the tape guide working position and the standby position retracted from this working position. It is configured. An air blow pipe 18 fixed to the sewing machine main body M is arranged near the upper portion of the tape delivery port 14a of the tubular tape guide 14. The nozzle portion 18a at the tip of the air blow pipe 18 is opened before the cloth edge cutting knife 9, and the nozzle portion 18a of the air blow pipe 18 is placed on the needle plate 3 as shown in FIG. By ejecting the air A toward the upper surface of the edge of the cloth S, the cloth S is pressed onto the needle plate 3, and the air B is blown from below the tubular tape guide 14 through the air nozzle 17. The tape T hung from the tubular tape guide 14 is blown and guided below the presser foot 8 in the raised posture.

Further, on the bracket 16b to which the tubular tape guide 14 is attached, a tape retainer 19 having a rod 19a that moves toward and away from the tubular tape guide 14 is supported by an air cylinder 13 as a driving means. When the tape retainer 19 advances, the tape T is held between the inlet end face 14b of the tubular tape guide 14 and the tape T is held. A tape holding device is configured.

Further, an air cylinder 20 for moving the presser foot 8 up and down, an air cylinder 16 for moving the tubular tape guide 14 in the direction of arrow a in FIG. 1, and an air nozzle 17 for an arrow b orthogonal to the cloth feed direction of the sewing machine. As shown in FIG. 4, the air cylinder 12 that moves in the direction, the air cylinder 13 that moves the tape retainer 19 forward and backward, the air nozzle 17, and the air blow pipe 18 are connected to a solenoid valve group 21 through an air supply source such as a compressor. (Omitted) and are formed in the same pneumatic circuit. A speed controller 22 such as a flow rate adjusting valve with a check valve is interposed in the air pressure supply system to the air cylinder 13 for moving the tape retainer 19 forward and backward. The cutting length of the tape T can be adjusted by adjusting the.

Further, an air cylinder 16 for moving the tubular tape guide 14 and an air cylinder 20 for vertically moving the presser foot 8 are connected to the respective inlet sides of the high pressure priority type shuttle valve 23, and the outlet of the shuttle valve 23 is connected. The speed controller 22 is connected to the side so that the tape T is always held when the tubular tape guide 14 is on the right side and the presser foot 8 is in the raised position.

Further, this overlock sewing machine is provided with a hand movement counter that counts the number of movements of the sewing machine needle. Depending on the number of movements of the needles set in the hand movement counter, the sewing machine is operated / stopped and the presser foot 8 is The control of the pneumatic circuit for the operation is performed.

Further, in this overlock sewing machine, in order to automatically sew an air ring continuing to the sewing start end of the cloth S into the stitch, an air nozzle for air ring processing, an air cylinder or the like is used. Although it has a ring holding / releasing mechanism, it is not related to the gist of the present invention, and therefore its explanation is omitted.

In the tape sewing device configured as described above, the tape T for stretch prevention is sewn into the cloth S from the start of sewing to the end of sewing, and the tape T from the middle of the cloth S to the end of sewing. Although it can be used for sewing, the operation when sewing the tape T from the beginning to the end of sewing will be described with reference to the timing chart of FIG.

When the cloth S is inserted under the presser foot 8 on the needle plate 3 of the overlock sewing machine, the light from the cloth detection sensor 10 is shielded by the cloth S and a signal indicating that the cloth is present is output. And the presser foot 8 descends. At the same time, the tape retainer 19 that holds the tape T between the inlet end surface 14b of the tubular tape guide 14 is retracted by the air cylinder 13, and the holding of the tape T is released. In this state, when the sewing machine motor is started to rotate by depressing the sewing machine pedal, the tape T is delivered onto the cloth S via the tubular tape guide 14, and the tape T is sewn into the cloth S.

When the cloth S that shields the light of the cloth detection sensor 10 disappears when the sewing machine is approaching the end of the sewing operation and the light enters, a signal indicating no cloth is output. Starts counting and reaches the set value n2, the air cylinder 16 operates to move the cylindrical tape guide 14 to the standby position, and the tape holder 19 advances by the air cylinder 13 to move the tape T Is temporarily held (held) with the inlet end surface 14b of the tubular tape guide 14. Here, when the tubular tape guide 14 moves to the standby position, the tape T portion that advances between the portion sewn into the cloth S and the tape feed-out port 14a of the tubular tape guide 14 is woven. It is cut with the scalpel 9 for edge cutting.

Since the rotation of the sewing machine motor is stopped when the predetermined number of hand movements n3 is reached after the above cloth-less signal is output, the tape T is completely covered even over the remaining rear end portion of the cloth S. Sewn in. The sewing length of the tape T can be arbitrarily set by the timing of the movement of the tubular tape guide 14 to the standby position and the advance of the tape retainer 19. Further, since the tape T is cut in a tensioned state in which the tape T is clamped by the tape retainer 19, it is possible to accurately control the length of the tape T sewn on the cloth S.

After the sewing as described above is completed, the presser foot 8 is raised to return the tubular tape guide 14 and the air nozzle 17 to the left operating position, and the air A and B are blown from the air nozzle 17 and the air blow pipe 18. The tape T is ejected and the tape T is guided under the presser foot 8 to prepare for the next sewing. Further, the air nozzle 17 is retreated to the right after ejecting air so as not to hinder sewing work such as insertion of cloth.

Next, the operation when the tape T is sewn from the middle portion of the cloth S to the end of sewing will be described with reference to the timing chart of FIG. At the start of sewing, the advance of the tape retainer 19 causes the tubular tape guide 14 that holds (holds) the tape T between the tape and the entrance end face 14b thereof to move to the standby position, and the predetermined number of needle movements n1. After that, the rotation of the sewing machine motor is stopped, the air cylinder 16 is actuated to move it to the tape supply position, and air A and B are ejected from the air nozzle 17 and the tip nozzle portion 18a of the air blow pipe 18, respectively. Guide the tip end of the tape T hanging from the tape feed-out port 14a of the tubular tape guide 14 onto the cloth S below the presser foot 8 and then lower the presser foot 8 at the same time. By retreating the tape retainer 19 by the cylinder 13 to release the holding of the tape T and start the rotation of the sewing machine motor, the cylindrical tape guide 1 Tape T fed out from go sewn into the top surface of the fabric S.

Then, when the cloth S that shields the light of the cloth detection sensor 10 disappears near the end of sewing and the light enters, a signal indicating no cloth is output as in the above case. Upon receipt of the signal, the hand movement counter starts counting, and when the set value n2 is reached, the air cylinder 16 operates and the tubular tape guide 14 moves to the standby position, and the tape holder 19 advances by the air cylinder 13. , The tape T is clamped (held) between the inlet end surface 14b of the tubular tape guide 14, and when the tubular tape guide 14 moves in the tape holding state, the portion sewn into the cloth S and the tubular shape The tape T portion advancing between the tape guide 14 and the tape delivery port 14a is cut by the cloth edge cutting knife 9.

It is also possible to control the tape T so that it is sewn from the middle of the cloth S to the middle thereof. This case can be dealt with by shifting the position of the cloth detection sensor 10 to the front side or by arranging a plurality of sensors in the sewing direction and selecting the sensors.

Although the two-needle overlock sewing machine is used in the above embodiment, it may be a one-needle overlock sewing machine. Further, this device can be applied to various kinds of sewing such as when sewn a tape to a part of the hem mouth of a shorts or a brief, etc. along the edge of the cloth.

[0029]

[Effect of device]

 As described above, according to the present invention, the number of needle movements of the sewing machine is set according to the form of the cloth on which the tape is sewn, and the tape feeding action of the tubular tape guide is related to the number of needle movements. By controlling the movement between the position and the standby position and the holding and releasing operation of the tape by the tape holding device, the tape is sewn over the entire length from the sewing start to the sewing end, and the tape is sewn. Not only can you select to sew from the middle part of the tape, but in any case, the tip of the tape is guided straight to the fabric, and the tape supply length is properly controlled to ensure that the tape is fed as specified. The tape sewing can be performed reliably and accurately. Moreover, after the tape is sewn in, the tape is held and moved from the operating position to the standby position, so that the edge of the tape can be cut at a certain position without variation by using the cloth edge cutting knife. Since the front end of the tape and the rear end of the fabric are accurately matched, it is possible to surely obtain a tape sewn product with a very good finish.

If the inlet of the high-pressure priority type shuttle valve is connected to the air cylinder that moves the presser foot and the tubular tape guide, and the air cylinder that operates the tape holding device is connected to the outlet, one expensive solenoid valve is omitted. can do.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of an overlock sewing machine equipped with a tape sewing device of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a front view showing a part of FIG. 2 in section.

FIG. 4 is a system diagram of an air pressure supply circuit.

FIG. 5 is a timing chart showing an operation when the tape is sewn from the beginning to the end of sewing.

FIG. 6 is a timing chart showing an operation when the tape is sewn from the middle portion of the cloth to the end of the sewing.

[Explanation of symbols]

 3 Needle plate 8 Presser foot 9 Cloth cutting edge knife 10 Cloth detection sensor 14 Cylindrical tape guide 16 Air cylinder (guide drive device) 17 Air nozzle 18 Air blow pipe 18a Nozzle part 19 Tape presser (tape holding device) M Sewing machine body S Cloth T tape A air

Claims (2)

[Scope of utility model registration request] 1. An overlock sewing machine having a cloth edge cutting knife, a needle plate, a presser foot, and a feed dog that cooperates with the presser foot to feed the cloth on the needle plate, and a side in front of the presser foot. In a tape sewing device provided with a tubular tape guide for guiding a tape which is arranged above and supplied from above to a needle drop portion of an overlock sewing machine, the tubular tape guide is attached to the needle drop portion. A guide drive device for moving in a direction intersecting the cloth feed direction between the tape feeding operation position and the standby position retracted from this operation position; and a holding / releasing operation provided by the driving means, which is attached to the tubular tape guide. A tape holding device for performing the operation, an air nozzle provided near the outlet of the tubular tape guide for ejecting air toward the tape, and a cloth detection sensor arranged above the needle plate to detect the presence or absence of cloth. And a hand movement counter that counts the number of movements of the sewing machine needle based on the signal of the cloth detection sensor,
When starting the tape sewing, while the tape holding device holds the tape with the tubular tape guide in the operating position, the air ejected from the air nozzle guides the tip of the tape under the presser foot, and the tape is being sewn. The tape holding is released, and at the end of the sewing of the tape, the tape is held by the tape holding device and the tubular tape guide is moved to the standby position in accordance with the number of stitches moved after the cloth detection sensor detects that there is no cloth. Then, the tape sewing device is characterized in that the tape is cut by a cloth edge cutting knife. 2. An air cylinder for moving the tubular tape guide and an air cylinder for vertically moving the presser foot are connected to each inlet side of the high pressure priority type shuttle valve, and the tape is provided on the outlet side of the shuttle valve. 2. The tape sewing device according to claim 1, further comprising an air pressure circuit connected to an air cylinder for operating the holding device, wherein the vertical movement of the presser foot and the tape holding / release movement operation of the tape holding device are interlocked with each other.