WO2006112460A1

WO2006112460A1 - Chain-stitch sewing machine

Info

Publication number: WO2006112460A1
Application number: PCT/JP2006/308148
Authority: WO
Inventors: Ikuo Tajima; Satoru Suzuki; Sei Kato
Original assignee: Tokai Kogyo Mishin Kabushiki Kaisha
Priority date: 2005-04-18
Filing date: 2006-04-18
Publication date: 2006-10-26
Also published as: CN2913409Y; EP1873294A1; JP2006296557A; CN101160426A; US20090038519A1; JP4310289B2

Abstract

A chain-stitch sewing machine, comprising a looper disposed under a throat plate, having a thread lead-in port and a thread lead-out port, and rotatingly driven in synchronism with sewing operation and a plurality of thread feed ports connected to different thread feed sources. The sewing machine also comprises a connection member having a thread passage and selectively connecting either of the plurality of thread feed ports to the thread lead-in port of the looper through the thread passage. A thread passing mechanism passes a thread fed from the thread feed port led to the thread lead-in port of the looper through the connection member into the thread lead-in port of the looper and takes out it from the thread lead-out port. The connection member may be selectively moved so that the inlet of the thread passage can be aligned with either of the plurality of thread feed ports. The plurality of thread feed ports may be arranged parallel with each other in a circular arc shape.

Description

Specification

Sewing machine and sewing machine

[0001] The present invention relates to a chain stitch sewing machine capable of performing multicolor chain stitching by selectively using a plurality of sewing threads having different colors and properties with a single looper. In particular, the present invention relates to a sewing machine and a sewing machine that are suitable for performing a sewing operation on a tubular workpiece.

Background art

[0002] Conventionally, a reed-driven reed needle and a looper arranged so as to supply a sewing thread below the needle plate cooperate with each other, and the looper is rotationally controlled synchronously with the sewing operation of the reed needle. Therefore, a chain stitch sewing machine that performs chain stitch on a sewing product is known. In addition, one looper is provided for one sewing head (also called a sewing head), and a plurality of sewing threads of different colors and properties are prepared for this single looper. A chain stitch sewing machine is also known in which a multi-color thread chain stitch (that is, a multi-color chain stitch) is applied to a sewing product by selectively inserting a thread into the looper. As an example of a sewing machine and a sewing machine of a type that can perform multicolor chain stitching by selectively using such a plurality of sewing threads with a single looper, it is disclosed in Patent Document 1 or Patent Document 2 shown below. There are chain stitch sewing machines. In the conventional chain stitch sewing machine as disclosed in the following Patent Document 1 or Patent Document 2, in order to selectively supply one of the plurality of sewing threads to the looper. A thread feeding mechanism that can slide in the lateral direction is arranged below the looper. In this thread supply mechanism, a plurality of sewing threads are set in parallel along the slide direction. By sliding the plurality of thread arrays themselves via the thread supply mechanism, the desired sewing thread is appropriately placed directly below the looper. In this state, the sewing thread positioned underneath the looper is passed through the looper by air injection, and the color of the sewing thread is changed (color thread selection).

Patent Document 1: Japanese Patent No. 3457040

Patent Document 2: JP 2002-317374 A

[0003] As described above, the conventional chain stitch sewing machine has a thread supply in which a plurality of sewing threads are set in parallel. Since the color of the sewing thread is changed by sliding the plurality of thread arrays themselves in the horizontal direction via a mechanism, it is difficult to reduce the size of the structure, and the width of the plurality of thread arrays is almost 2%. It was necessary to secure a slide space (extra space for lateral movement) in the double range. For this reason, conventionally, the type of chain stitch sewing machine that can select color threads has been unable to apply force to a flat sewing product. On the other hand, there are also tubular items such as T-shirts and hats. As is well known, in order to perform normal sewing or embroidery on a cylindrical sewing product, it is necessary to position a cylindrical shuttle bed with a built-in hook inside the cylindrical sewing product. . Similarly, in order to carry out chain stitching on a cylindrical sewing product, it is necessary to position a looper inside the cylindrical sewing product. However, conventional chain stitching that can change the color of the sewing thread by arbitrarily inserting a plurality of threads through a single looper! For sewing machines, the thread supply mechanism Since the arrangement of the plurality of sewing threads itself is slid horizontally along the sliding direction, it is difficult to reduce the size of the structure, and a wide space for sliding (the margin for lateral movement) Therefore, it is necessary to secure a considerably large space on the inner side of the cylindrical sewing product in which the thread supply mechanism is arranged. For this reason, as a cylindrically sewn product that can be chain-sewn, it is possible to sew a large-sized sewing product that can be chain-sewn as long as the force is limited. Even if it is a product, its sewing range is extremely limited, and its practicality is poor. Accordingly, in the past, there has been no sewing machine or sewing machine suitable for performing a multi-color thread sewing (multi-color sewing) on a cylindrical workpiece.

Disclosure of the invention

[0004] The present invention has been made in view of the above-described points, and includes one looper corresponding to one sewing machine head, a chain sewing machine, a sewing machine, and a plurality of sewing threads. It is intended to provide a chain stitch sewing machine having a compact thread supply mechanism that selectively supplies a desired sewing thread to the looper in a state where it can be sewn to the looper. The present invention also aims to provide a chain stitch sewing machine suitable for chain stitching with a multicolored thread on a cylindrical workpiece.

[0005] The chain stitch sewing machine according to the first aspect of the present invention has a hook needle that is driven in a reciprocating manner and a lower side of a needle plate, and has a thread insertion port and a thread outlet port, and is synchronized with a sewing operation. Driven to rotate A looper, a plurality of thread supply ports each connected to a different thread supply source, and a thread passage, through which the shift of the plurality of thread supply ports is selectively made to the thread insertion port of the looper And a sewing thread supplied from a thread supply port connected to the looper's thread insertion port via the connection member is passed through the looper's thread insertion port and discharged from the thread outlet port. And a threading mechanism.

[0006] According to the first aspect of the present invention, between the plurality of yarn supply ports and the looper, the displacement of the plurality of yarn supply ports is selected as a yarn insertion port of the looper via a yarn passage. With the configuration in which the connecting members are connected to each other, the mechanism for selecting and supplying the looper thread can be compactly gathered. As a result, the entire thread selection and supply mechanism for selectively supplying a plurality of sewing threads of different colors and properties to a single looper and a shape with one end protruding from the looper ( It can be configured to be compactly housed in a (cantilevered) looper base. Along with this, it is possible to put in and out the cylindrical sewing product from this one end, so that it can be sewn to the cylindrical sewing product! It becomes possible to provide a chain stitch sewing machine suitable for In addition, since the structure for selecting and supplying the thread itself can be made more compact than conventional ones, not only the cylindrical sewing product but also the chain sewing for the flat sewing product is performed. The sewing machine can also be advantageously applied.

[0007] As a preferred embodiment of the present invention, the connecting member interposed between the plurality of yarn supply ports and the looper itself has the inlet of the yarn passage as any force of the plurality of yarn supply ports. It can be selectively moved to match ゝ. As described above, the arrangement of the plurality of yarn supply ports is configured to move the connecting member without power, thereby simplifying the configuration of the moving mechanism and reducing the size and moving ( (For example, sliding) It is possible to eliminate the need for extra space to secure the possible range (because the plurality of yarn supply ports themselves are not moved sideways).

As another preferred embodiment of the present invention, the plurality of yarn supply ports are arranged side by side in an arc shape, and any one of the plurality of yarn supply ports is turned by rotation of the connecting member along the arc arrangement. It is connected to the thread insertion port of the looper. As a result, the mechanism for supplying the sewing thread to the thread insertion port of the looper can be made smaller and the color thread can be selected. By making the movement for the purpose of the circular motion that does not slide in the horizontal direction, the extra space for securing the movable (sliding) range can be eliminated. Therefore, the sewing machine can be more advantageously applied to a sewing machine that performs chain stitching on a cylindrical sewing product.

[0008] A chain stitch sewing machine according to another aspect of the present invention has a reed-driven reed needle and a needle plate, and has a thread insertion port and a thread outlet port, and rotates in synchronization with a sewing operation. A looper to be driven; a plurality of yarn supply ports arranged in an arc; a selection device that selectively connects any of the plurality of yarn supply ports to a yarn insertion port of the looper; and the selection device A threading mechanism that allows the thread to be fed through the thread insertion port of the looper to be fed through the threader inlet of the looper and out of the thread outlet. The sewing thread that has come out of the thread outlet is rotated in accordance with the rotation of the looper, and chain stitching is performed in cooperation with the heel needle. In this way, by arranging the plurality of yarn supply ports in an arc shape, even if the yarn supply port array itself is driven for selecting a color yarn, the movement is not a lateral slide but an arc motion. Therefore, an extra space for securing a movable (sliding) range can be eliminated. Therefore, the sewing machine can be more advantageously applied to a sewing machine that performs chain stitching on a cylindrical workpiece. Brief Description of Drawings

FIG. 1 is an external view of a multi-headed chain stitch sewing machine according to an embodiment of the present invention.

FIG. 2 is a side view of the looper base as seen from the right with respect to the front direction of the sewing machine shown in FIG.

FIG. 3 is a side sectional view of the looper base.

[Fig. 4] A top view of the looper base.

FIG. 5 is a bottom view of the looper base.

FIG. 6 is a front view of the looper base as seen from the front of the sewing machine shown in FIG.

FIG. 7 is an enlarged side sectional view similar to FIG.

[Fig. 8] Fig. 8 is a perspective view showing a part of the configuration inside the tip of the looper base according to the same embodiment.

FIG. 9 is a plan sectional view of an air supply block.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an external view of a multi-head chain stitch sewing machine according to an embodiment of the present invention, which includes a plurality of chain stitch sewing machine heads 3. 1 is a sewing machine frame, 2 is a table, and table 2 has a front table 2a that can be raised and lowered. On the front surface of the sewing machine frame 1, a plurality of (4 in the illustrated example) sewing machine heads 3 for sewing, which itself has a well-known structural force, are arranged, and each sewing head 3 is driven back and forth up and down. It has a hammer 4 (see Fig. 7 described later). A cylindrical looper base (looper part) 5 is arranged below each sewing head 3. A base sash frame (not shown) that is moved in the XZY direction is disposed on the table 2, and a pair of left and right support arms 6 are provided on the base sash frame corresponding to each sewing head 3. The pair of support arms 6 supports a sewing frame 7 on which a cylindrical workpiece H such as the body of a T-shirt is set. The looper base 5 has a cylindrical shape (cylinder shape or bar shape) with the front end protruding into the space so that it can enter the inside of the cylindrical workpiece H set in the sewing frame 7. It consists of a cantilevered support structure with its base (one end near the back) fixed to the sewing machine frame 1.

Next, the internal structure of the looper base 5 will be described in detail. FIG. 2 is a side view of the looper base 5 according to the embodiment as seen from the right with respect to the front surface force of the sewing machine shown in FIG. 1, and FIG. 3 is a side sectional view of the looper base 5. In FIGS. 2 and 3, the front end portion that protrudes into the space is illustrated on the left side, and the base portion (one end on the back) that is fixed to the sewing machine frame 1 is positioned on the right side. . FIG. 4 is a top view of the looper base 5, and FIG. 5 is a bottom view of the looper base 5. FIG. 6 is a front view of the looper base 5 as seen from the front surface of the sewing machine shown in FIG. As is clear from FIGS. 2 and 5, the base 8 of the looper base 5 is fixed to the sewing machine frame 1 with four stud bolts 9. A plurality of covers are provided above and below the base body 8, and the looper base 5 is formed so as to cover the whole with these covers. 2, 4, 5, and 6, the looper base 5 with the covers removed is illustrated for easy understanding of the explanation (in the figure,! Show the cover with imaginary lines).

[0012] Mainly, as shown in FIG. 2, FIG. 3, FIG. 4, FIG. 5, etc., a looper is provided at the tip of the base 8 (the left side of FIG. 2 and FIG. 3, the lower side of FIG. 4 and FIG. 5). R is disposed, and the looper R has a base 8 and the A support member 10 fixed at a predetermined distance below the base body 8 is rotatably supported. A pulley portion Ra is formed on the outer periphery of the looper R. On the other hand, a motor 14 is fixedly installed at the base of the base 8 (the right side of FIGS. 2 and 3, the upper side of FIGS. 4 and 5), and a drive pulley 15 is fixed to the motor shaft of the motor 14. It is. In addition, a bearing member 13 is provided in front of the intermediate position between the tip and base of the base body 8. The bearing member 13 includes a large-diameter pulley 12a and a small-diameter pulley 12b that are arranged vertically with the base body 8 interposed therebetween. The intermediate pulley 12 is supported rotatably. The timing belt 16 is stretched between the pulley portion Ra of the looper R and the large-diameter pulley 12a of the intermediate pulley 12. On the other hand, between the small-diameter pulley 12b of the intermediate pulley 12 and the drive pulley 15 of the motor 14. The timing belt 17 is stretched over. According to such a configuration, as the drive pulley 15 is rotated by driving the motor 14, it is transmitted to the small-diameter pulley 12b by the rotational force timing belt 17 and is fixed to the common shaft with the small-diameter pulley 12b. The large pulley 12a is rotated. Further, as the large-diameter pulley 12a rotates, the rotation is transmitted to the pulley portion Ra by the timing belt 16. In this way, the looper R can finally be rotationally driven by the transmitted rotational force of the motor 14 force.

FIG. 7 is an enlarged side sectional view showing a side section of the looper base 5 shown in FIG. FIG. 8 is a perspective view showing a part of the configuration in the tip of the looper base 5 according to the same embodiment. As is apparent from FIG. 7, the looper R has a threading hole 11 that passes vertically so that the sewing thread T can pass therethrough. The threading hole 11 is bent at the middle portion as shown in the figure, and is formed so as to derive the force of the opening Rb at the upper end of the sewing thread T inserted from the thread insertion opening 1 la which is the opening at the lower end. The That is, the threading hole 11 is formed with the thread insertion opening 11a, which is the opening at the lower end, at the rotation center position of the looper R, and the upper end opening Rb at the opposite side at an eccentric position from the rotation center of the looper scale. The shape is bent at the middle part. A yarn outlet pipe 45 is erected at the upper end opening Rb, and the upper end thereof becomes the yarn outlet port l ib. The thread outlet port l ib guides the sewing thread T by urging the needle hole 43a provided in the needle plate 43 fixed to the bracket 34 and allowing the needle needle 4 to pass therethrough. As is well known, when the heel needle 4 is lowered and the heel portion of its tip passes through the needle hole 43a, the looper R is driven to rotate as described above, thereby being led out from the yarn outlet port l ib. Sewing thread T to needle 4 The chain stitch is performed by winding and then pulling the thread T, which has been wound by raising the needle 4, onto the surface of the work to be sewn. The sewing thread Τ is fed out by a plurality of thread spool forces arranged in a thread stand (not shown). The thread thread in each of the plurality of thread spool forces is selectively shifted out of the thread thread of the looper R. 11 (The details will be described later).

As shown in FIGS. 3, 5, etc., the shaft 18 is rotatably supported by a bearing 19 fixed to the bottom surface of the base 8 and a bracket 20 fixed to the bottom surface of the support member 10. A driven gear 21 is fixed to the rear end portion of the shaft 18, and the driven gear 21 is meshed with a drive gear 22 positioned below. The drive gear 22 is fixed to a slide shaft 23 that is slidably driven in the left-right direction in accordance with a color change command of the sewing thread へ to the chain stitch sewing machine. Both the drive gear 22 and the driven gear 21 are spiral gears. Therefore, the shaft 18 is rotationally driven via the drive gear 22 and the driven gear 21 in accordance with the slide drive of the slide shaft 23. As shown in FIG. 5, FIG. 6, or FIG. 8, etc., a plurality of (9 in the illustrated example) guide tubes 24 are arranged in an arc shape centered on the shaft 18. Each guide tube 24 is configured so that a plurality of thread spools arranged in a thread stand device (not shown) can be set so that the trailing edge force can be set toward the leading end. The tip of each guide tube 24 is supported by a bracket 20, and the bracket 20 corresponds to each guide tube 24 with a thread supply port serving as an outlet of the sewing thread セット set in each guide tube 24. There are several. On the other hand, the rear part of each guide tube 24 is bent and the rear end part is formed substantially vertically downward. The rear end of each guide tube 24 is fixed in series in the left-right direction to a guide member 26 fixed to the sewing machine frame 1, and is arranged at a predetermined position below it! The sewing thread Τ fed from an external thread stand (yarn supply source) is drawn into each guide tube 24 from the rear end portion. Further, the front portion of the bent portion of each guide tube 24 is supported by a support member 25. With such a configuration, a plurality of yarn supply ports can be arranged densely in the bracket 20 (at an interval narrower than the arrangement interval of each thread stand), so that the plurality of yarn supply ports can be gathered in a compact manner. It is possible to make the looper base 5 suitable for being placed in a cylindrical sewing product basket.

As described above, the end of the shaft 18 that is rotatably supported on the bottom surface of the base 8 is connected to the end of the shaft 18. The connecting member 27 is fixed. As is apparent from FIGS. 7 and 8, the connecting member 27 has one inclined connecting hole 27a (yarn passage), and has a connecting portion 27b at the tip thereof. In the connecting hole 27a (thread passage), the tip (left side in Fig. 7) is at a position on the extension of the axis of the shaft 18, and the rear end (right side in Fig. 7) is the tip of the guide tube 24 (details are brackets). It is formed at a position that can match 20 thread supply ports). As a result, the connecting member 27 is rotated at a predetermined angle (pitch) along with the rotation of the shaft 18 as described above, and accordingly, the connecting hole 27a (thread passage) of the connecting member 27 is formed in the bracket 20 at its tip portion. Can be selectively connected to each guide tube 24 supported by the guide tube 24 in order to form a single thread passage through which the thread T passes. .

An air supply block 28 is fixed to the bottom surface of the support member 10. As is apparent from FIGS. 7 and 8, a nozzle 29 is fixed to the air supply block 28, and the air supply block 28 is connected to the rear end of the nozzle 29 at a position where the linkage portion 27b of the connection member 27 enters. The block 28 and the connecting member 27 are arranged with each other. A connecting pipe 30 is fixed to the tip of the nozzle 29, and the upper end of the connecting pipe 30 faces the Luno R yarn feeder inlet 11a almost closely. FIG. 9 is a plan sectional view of the air supply block 28. A connector 31 is fixed to the air supply block 28, and a tube 32 from an air supply source (not shown) is connected to the connector 31. As a result, air is also supplied into the air supply block 28 as an air supply source. When air is supplied to the air supply block 28, the air flows through the air passage 28a into the annular space 28b formed between the -pull portion 29a of the nozzle 29 and the air supply block 28, and further to the -pull portion 29a. The outer peripheral portion force is also blown vigorously into the connecting pipe 30 and ejected from the yarn outlet port l ib of the threading hole 11. For this reason, the inside of the -pull portion 29a becomes a negative pressure, and the suction force of the yarn is generated. That is, the shaft 18 is rotated to connect the connecting hole 27a of the connecting member 27 to the guide tube 24 through which the desired sewing thread T is passed, and then the desired sewing thread T is looped out by supplying air. It is inserted into the threading hole 11 of R. In this way, a series of supply paths for the sewing thread T from the thread stand device (not shown) to the guide tube 24 (the thread supply port of the bracket 20), the connecting hole 27a of the connecting member 27, and the threading hole 11 of the looper R. Is to be formed. These air supply block 28, air supply source, connecting pipe 30 and the like let the thread pass from the thread insertion port 11a of Luno R into the threading hole 11. A threading mechanism is constructed to serve the purpose.

As shown in FIG. 4, a movable blade 33 is rotatably supported on a bracket 34 fixed to the upper surface of the base 8. The movable blade 33 has a connecting arm 33a, and the connecting arm 33a is connected to the lever 36 via a connecting plate 35. The lever 36 is fixed to the upper end of a shaft 37 that is pivotally supported by the base 8, and a drive arm 38 is fixed to the lower end of the shaft 37 as shown in FIG. The front end of the drive arm 38 is connected to the fixed block 40 via a connecting metal 39. The fixed block 40 is fixed to a slide shaft 41 that is driven to slide in the left-right direction in response to a thread trimming command to the chain stitch sewing machine. Thereby, when the slide shaft 41 is slid, the movable blade 33 is rotated. A fixed blade 42 is fixed to the side surface of the bracket 34, and the sewing thread T is cut by the fixed blade 42 and the movable blade 33 that is rotated. That is, at the time of sewing, the movable blade 33 is in the rotational position indicated by the solid line in FIG. 4, that is, the position where the looper R force has no influence on the derived thread T. As the cutting operation of the sewing thread T, first, the movable blade 33 is rotated in the clockwise direction (in FIG. 4) to the position where the sewing thread T can be captured on the fixed blade 42 side. Next, the movable blade 33 is rotated counterclockwise, the sewing thread T is captured and returned to the rotation position indicated by the solid line in FIG. At this time, the movable blade 33 and the fixed blade 42 come into contact with each other and the sewing thread T is cut. At this time, the thread end on the looper R side of the cut sewing thread T is held by a holding member (not shown). The holding of the thread end on the looper R side of the sewing thread is released by rotating the movable blade 33 by a certain amount in the clockwise direction.

[0018] In addition, below the rear end of each guide tube 24, the thread end of the sewing thread T that has been inserted into the looper R (has been sewn so far) is positioned in the guide tube 24. A thread handling device is provided. As such a yarn handing device, for example, a pulling-down member described in Japanese Patent Application Laid-Open No. 2002-317374 related to the applicant's application and an increasing means for increasing the pulling-down amount of the yarn may be used. Since these are publicly known, description thereof is omitted here. Of course, not limited to the above, of course.

[0019] Next, in the chain stitch sewing machine according to the present invention configured as described above, an operation when performing chain stitch on a tubular workpiece is described. Each guide tube 24 has a plurality of thread spools arranged in a thread stand device (not shown) and a thread T with different colors and properties. Are set. When chain stitching is started, first, the shaft 18 is rotated to connect the connecting hole 27a of the connecting member 27 with the guide tube 24 with the desired sewing thread T set. When air is supplied to the air supply block 28 in this state, the sewing thread T set in the guide tube 24 connected by the supplied air is inserted into the threading hole 11 of the looper R, and the sewing thread T The yarn end of the yarn is led out from the yarn outlet l ib. Then, by rotating the movable blade 33 in the same manner as when cutting the yarn, the connecting hole 27 of the connecting member 27, the connecting pipe 30 of the air supply block 28, and the threading hole 11 of the looper R are passed through the thread outlet port l ib. Hold the thread end of the derived thread T.

[0020] When the thread end of the sewing thread T is held, the motor 14 is driven to rotate the Luno R and the needle 4 of the sewing machine head 3 is moved up and down. In addition, the sewing frame 7 on which the cylindrical workpiece H is set is moved in the XZY direction in synchronization with these operations. In this way, the sewing product H is subjected to chain stitching such as a pattern or embroidery with a desired sewing thread T.

[0021] When changing the sewing thread T for chain stitching, stop the rotation of the looper R and the vertical movement of the needle 4 and then rotate the movable blade 33 sequentially in the clockwise and counterclockwise directions to rotate the sewing thread T. Disconnect. When the sewing thread T is cut, the movable blade 33 is further rotated by a certain amount in the clockwise direction to release the holding of the thread end on the looper R side of the sewing thread T. Then, the thread T inserted through the looper R is hand-operated by a thread handing device (not shown), and the thread end on the Luno R side of the released thread T is positioned in the guide tube 24. Next, the shaft 18 is rotated so that the connecting hole 27a of the connecting member 27 is connected to the guide tube 24 in which the next desired sewing thread T is set, and air is supplied to the air supply block 28 so that the sewing thread T is looped. Pass the thread through R, and then rotate the movable blade 33 to hold the thread end of the thread T inserted through Luno R. Then, in the same manner as described above, the looper R is rotated and the heel needle 4 is moved up and down to carry out chain stitching with the desired sewing thread T on the workpiece H. As is well known, there are chain stitches, loop stitches and the like as chain stitch types, which can be switched according to the setting of sewing and operation.

[0022] As described above, according to the chain stitch sewing machine shown in the above embodiment, a plurality of threads are guided to the vicinity of the looper R by the guide tube 24, and each guide tube is rotated by the rotation of the connecting member 27. 24 and Luno R thread guide hole 11 can be connected to each other, so that the member positioned below Looper R can be made very small, and Looper base 5 is a narrow cylindrical type. To do Can do. As a result, it can be positioned inside various kinds of cylindrical sewing objects H. Further, when changing the sewing thread T, only the small bulky connecting member 27 is rotated, so that the color change can be performed at high speed only by making the drive source small.

In the above embodiment, air from the air supply source is supplied only to the air supply block 28, and the sewing thread T set in the connected guide tube 24 is inserted into the threading hole 11 of the looper R. However, the present invention is not limited to this, and the movement of the sewing thread T in the guide tube 24 may be assisted by supplying air also to the vicinity of the rear end portion of the guide tube 24.

The sewing thread T is guided to the vicinity of the looper R, and the thread rod inlet 11a of the looper R and the end of the guide tube 24 are selectively connected by the connecting member 27, so that a plurality of loopers R can be connected to the looper R. The structure in which the sewing thread is arbitrarily inserted does not necessarily have to be positioned inside the cylindrical sewing object H. In other words, the present invention can be applied to a sewing machine that sews a flat sewing product!

The arrangement of the guide pipe 24 that guides the sewing thread T to the vicinity of the looper R and the arrangement of the plurality of thread supply ports of the bracket 20 are arc-shaped around the axis of the shaft 18 as in the above embodiment. It is not limited to this arrangement, and for example, it may be an arrangement arranged side by side in a straight line. However, in such a case, it is needless to say that the connecting member 27 is driven to move in parallel rather than rotationally to connect the connecting hole 27a of the connecting member 27 to each guide tube 24. Even in such a case, according to the present invention, the arrangement of the plurality of yarn supply ports can be configured to move the connecting member 27 without power, thereby simplifying and downsizing the configuration of the slide mechanism, and In addition, an extra space for securing a slideable range can be eliminated.

[0025] Further, as a modification of the present invention, the plurality of yarn supply ports of the bracket 20 are either in the case of arranging the plurality of yarn supply ports in an arc shape or in the case of arranging them side by side in a straight line. It is also possible to provide a shirter that can be controlled to open and close corresponding to each of the mouths, and to provide a plurality of thread passages in the connecting member 27 corresponding to each thread supply opening at the entrance and to connect to one at the exit. Good. By doing so, it is possible to select the color yarn by opening only the shirt of the desired color yarn without moving the connecting member 27. In that case, the shirter corresponding to each thread supply port may be provided on the bracket 20 side, or may be provided on the connecting member 27 side. [0026] Furthermore, as another modification of the present invention, the bracket 20 itself in which a plurality of yarn supply ports are arranged in an arc shape may be rotated along the arc arrangement. Even in such a case, it is not necessary to provide an extra space in the lateral direction to secure the possible sliding range, so that the overall configuration is small, and the looper base 5 is a cylindrical cover set on the sewing frame 7. It can be suitable for storage inside the sewn product H.

[0027] Note that the guide tube 24 is not limited to a tubular shape, and any guide tube 24 may be used as long as it can guide the sewing thread T to the bracket 20.

As is well known, the sewing frame 7 is driven in the XZY direction in accordance with the sewing pattern data. However, the sewing frame 7 is not limited to the flat XZY drive, but includes a rotational drive as known for embroidery sewing of a hat or the like. It may be. Alternatively, the sewing head 3 and looper base 5 may be moved according to the sewing pattern! / ヽ.

Claims

The scope of the claims

[1] A reciprocating needle

A looper disposed below the needle plate, having a thread insertion port and a thread outlet port, and driven to rotate in synchronization with the sewing operation;

A plurality of thread supply ports each leading to a different thread supply source;

A connecting member that has a yarn passage and selectively connects one of the plurality of yarn supply ports to the yarn insertion port of the looper through the yarn passage;

A threading mechanism for allowing a sewing thread supplied from a thread supply port connected to the thread insertion port of the looper through the connecting member to pass through the thread insertion port of the looper and to be discharged from the thread outlet port;

A sewing machine characterized by comprising a sewing machine.

[2] The chain stitch sewing machine according to claim 1, wherein the connecting member is selectively movable so that an inlet of the yarn passage matches a shift of the plurality of yarn supply ports.

[3] The plurality of yarn supply ports are arranged side by side in an arc shape, and any one of the plurality of yarn supply ports is connected to the yarn hook inlet of the looper by the rotation of the connecting member along the arc array. The chain stitch sewing machine according to claim 1, wherein the sewing machine is connected to the sewing machine.

[4] The plurality of yarn supply ports are arranged in a straight line, and one of the plurality of yarn supply ports is connected to the yarn insertion port of the looper by moving the connecting member along the array. The chain stitch sewing machine according to claim 1, wherein the sewing machine is a sewing machine.

5. The chain stitch sewing machine according to claim 1, wherein the threading mechanism pushes the sewing thread to the thread outlet through air jet output.

[6] The plurality of yarn supply ports are arranged in a bracket, and the yarn supply source force corresponding to each of the yarn supply ports extends to the bracket. Sewing machine, sewing machine.

[7] The plurality of yarn supply ports are densely arranged on the bracket.

The chain stitch sewing machine according to 6.

[8] The chain stitch sewing machine according to any one of claims 1 to 7, wherein the looper is located inside a cylindrical sewing product. A reciprocating needle,

A plurality of yarn supply ports arranged in an arc,

A selection device for selectively connecting a shift of the plurality of yarn supply ports to a yarn insertion port of the looper;

A threading mechanism for passing the sewing thread supplied from the thread supply port connected to the thread insertion port of the looper through the selection device to the thread insertion port of the looper and out of the thread outlet port;

With

A sewing machine, comprising: a sewing machine that rotates a sewing thread from the thread outlet in accordance with rotation of the looper, and performs chain sewing in cooperation with the heel needle.