CN1989285A - Thread feeding apparatus for an automatic embroidering machine - Google Patents

Abstract

The present invention relates to a thread feeding apparatus for an automatic embroidering machine supplying an upper thread from a thread supplying unit to a needle, comprising a thread tension adjuster having a thread contact portion allowing an upper thread to be at least partially wound thereon and be in contact therewith, and resisting the upper thread passing through the thread contact portion to adjust the tension of the upper thread; a take-out unit provided to rotate about a predetermined rotation axis, and rotated while holding the upper thread spaced from the rotation axis to put the upper thread on the thread tension adjuster; and a take not out driver driving the thread take-out unit to rotate for at least partially winding the upper thread on the thread contact portion. Thus, the present invention provides a thread feeding apparatus for an automatic embroidering machine, which conveniently adjusts the tension of an upper thread and reduces work time.

Description

Thread feeding device for automatic embroidery machines

technical field

The present invention relates to a silk thread feeding device for an automatic embroidery machine, more specifically, relates to a silk thread feeding device for an automatic embroidery machine, which has an improved structure for adjusting the tension of the upper thread.

Background technique

An automatic embroidery machine is a sewing machine that uses silk threads of various colors and automatically embroiders predetermined patterns, trademarks or the like on objects such as labels of clothes and shoes according to a preset program.

Generally, the automatic includes a push rod positioned at the front of the fixed frame; an upper thread supply member mounted on the push rod, which supplies upper threads of different colors from a plurality of thread shafts to the embroidery work position; Needle work piece for face threading and embroidery work.

In addition, automatic embroidery machines are classified into a single-needle type and a multi-needle type according to the number of needles installed in an upper thread supply part and a needle work part.

A single-needle type automatic embroidery machine includes an upper thread supply part for supplying one of a plurality of colors of upper threads selected from a plurality of bobbins to the needle work part, and a needle work part. The work piece has a single needle for sewing the supplied single upper thread and performing the embroidery work.

A multi-needle type automatic embroidery machine includes an upper thread supply part for supplying upper threads of a plurality of colors selected from a plurality of bobbins to the needle work part, and a needle work part There are a plurality of needles for sewing each supplied upper thread, and an embroidery work is performed with a selected one of the plurality of needles.

Hereinafter, a single needle type automatic embroidery machine will be described.

A conventional single-needle type automatic embroidery machine has been disclosed in Korean Patent Application Publication No. 2002-0068028 entitled "Silk Thread Feeding Device for Automatic Embroidery Machine".

This traditional thread feeding device for automatic embroidery machines includes a push rod with a needle work piece; an upper thread supply part for supplying one of the upper threads selected from a plurality of colors; The ejector rod receives the first guide pipe from the wire supply part, and the second guide pipe has an upper end and a lower end, and the upper end is spaced apart from the first guide pipe to form a predetermined interval along the axial direction. part, the lower end is adjacent to the needle working part; and the thread tensioning member includes a swing lever that swings on a plane parallel to the thread supply path, and is connected to the free end of the swing lever transversely to the swing direction of the swing lever and the wire holder reciprocates in the spaced portion as the swing lever swings, thereby increasing/releasing the tension of the wire. Therefore, the ejector pin is simplified, and the curved path of the wire conveying path is eliminated, thereby enabling smooth supply of the wire.

Also, a conventional thread feeding device for an automatic embroidery machine includes a thread tension retainer, which is located on an upper side of a jack and adjusts the tension of upper threads extending from a plurality of thread spools.

However, a conventional thread feeding device for an automatic embroidery machine adjusts the tension of all upper threads extending from a plurality of bobbins, so that the structure of the device is complicated, and the user has to place the upper thread with the thread tension maintainer one by one. Connect, and adjust the tension of the upper thread. Therefore, it is not easy to adjust the tension of the upper thread, and it takes a lot of working time.

Contents of the invention

Accordingly, an aspect of the present invention is to provide a thread feeding device for an automatic embroidery machine, which conveniently adjusts the tension of the upper thread and reduces working time.

The foregoing and other aspects of the present invention are achieved by providing a thread feeding device for an automatic embroidery machine which supplies upper thread from a thread supply to a needle, said device comprising: a thread tension adjuster having a thread a contact portion that allows an upper thread to be at least partially wound around and in contact with the thread contact portion and resists the upper thread passing through the thread contact portion to adjust the tension of the upper thread a picker for rotating around a predetermined axis of rotation, and while keeping the upper thread spaced apart from the axis of rotation, the picker rotates to place the upper thread on the thread tension adjuster; and a pick-up drive that rotates the pick-up member for at least partially winding the upper thread around the thread contact portion.

According to an aspect of the present invention, the pick-up driver includes: a rotating shaft connected to and rotates with the pick-up member; a driving shaft spaced apart from the rotating shaft by a predetermined wheelbase; a shaft driver, the a shaft driver to rotate the drive shaft; and a power transmission member positioned between the rotation shaft and the drive shaft and transmitting rotational force from the drive shaft to the rotation shaft.

According to an aspect of the present invention, the thread feeding device further includes: a swing frame including a thread holder for holding the upper thread transferred from the thread tension adjuster to the needle, and The thread holder swings to enhance and release the tension of the upper thread; a stand driver, which drives the swing stand to move the thread holder of the swing stand onto the thread conveying path, and to move the thread holder to the thread transmission path. The upper thread is placed on the thread holder; and a swing bracket elastic member elastically makes the swing bracket swing.

According to one aspect of the present invention, the wire feeding device according to claim 1, wherein the carriage driver comprises: a carriage driving cam having a cam profile formed on a side surface of the carriage driving cam; a moving pin which moves a pin moves along a cam profile of the bracket driving cam; and a cam driver for rotating the bracket driving cam by moving the moving pin along the cam profile of the bracket driving cam, wherein the swing bracket elastic member has The bracket drives the first end supported by the cam and the second end supported by the swing bracket, and the swing bracket elastic member swings the swing bracket.

According to an aspect of the present invention, the bracket driver further includes a cam elastic member elastically rotating the bracket driving cam to return to an initial position.

According to an aspect of the present invention, the thread feeding device further includes: a thread tensioning member, which swings within a predetermined portion to enhance and release the tension of the upper thread; and a thread pick-up member, which The picker picks up the upper thread transferred from the thread tension adjuster to the needle working part, and places the upper thread on the thread tensioner and thread holder, wherein the swing bracket is Swing in the vertical direction corresponding to the wire tensioning member.

According to one aspect of the present invention, when the wire tensioning member is located at the top dead center of the wire tensioning member, the wire retainer is located at the top dead center of the swing bracket, and when the wire tensioning member is located at the top dead center of the wire tensioning member When the tension member is at the bottom dead center, the wire retainer is located at the bottom dead center of the swing bracket.

Description of drawings

1 is a schematic view showing a thread feeding device for an automatic embroidery machine according to a first embodiment of the present invention;

Fig. 2 is a partial cross-sectional view of the silk thread feeding device used in the automatic embroidery machine in Fig. 1;

Fig. 3 is a partially enlarged perspective view of Fig. 2;

Figure 4 is an exploded perspective view of Figure 3;

5A, 5B, 6A and 6B are partially enlarged perspective views and side sectional views showing the process of winding the upper thread around the thread tension adjuster in FIG. 2;

7A and 7B are top views showing the process of winding the upper thread on the pickup and the swing support;

Fig. 8A, Fig. 8B, Fig. 9A, Fig. 9B, Fig. 10A and Fig. 10B are side views representing the process of operating the stand driver;

11 is a partially enlarged perspective view of a thread feeding device for an automatic embroidery machine according to a second embodiment of the present invention;

Figure 12 is an exploded perspective view of Figure 11;

13A and 13B are partially enlarged perspective views showing the process of operating the wire tensioner and the swinging support in FIG. 11;

14A and 14B are cross-sectional views showing the process of operating the wire tensioner and the swing support in FIG. 11 .

Detailed ways

Hereinafter, a single-needle type automatic embroidery machine as one embodiment of the present invention will be described with reference to the accompanying drawings, in which all the same reference numerals denote the same elements, and repeated description will be omitted as necessary.

As shown in FIGS. 1 to 4 , a thread feeding device 1 for an automatic embroidery machine according to a first embodiment of the present invention includes a thread supply member 5 for supplying one upper thread selected from a plurality of upper threads of different colors. 3; a thread guide 8 for guiding the upper thread 3 supplied from the thread supply part 5 to the needle 13; The upper thread 3 is tensioned, and the tension of the upper thread 3 is strengthened and released.

The thread supply member 5 includes a thread supply groove 6, and supplies one upper thread 3 selected from a plurality of upper threads different in color to the thread guide 8 using compressed air.

The thread guide 8 is formed with a thread guide groove 9 for guiding the upper thread 3 supplied from the thread supply member 5 . In the present embodiment, the shape of the wire guide 8 is similar to a block having a rectangular cross-section, but is not limited to and may be formed into a tubular body having a different cross-sectional shape.

Meanwhile, the wire supply member 5 and the wire guide 8 are spaced apart from each other along the wire transport path, thus forming a space portion 15 .

Spacing part 15 comprises a thread tension adjuster 21, and the surface thread 3 that passes space part 15 is wound and contacts on this thread tension regulator 21, and this thread tension regulator 21 adjusts the tension force of surface thread 3; -out unit) 25, when the upper thread passing through the spacing portion 15 is maintained, the pick-up member 25 rotates, and the upper thread 3 is wound on the thread tension adjuster 21.

The thread tension adjuster 21 is shaped like a disk and has a thread contact portion 23 recessed along the circumference of the thread tension adjuster 21 on which the upper thread 3 is partially wound and contacted. The thread tension adjuster 21 is housed in a housing groove 29 of the picker 25, which will be described later. The thread contact portion 23 resists passage of the upper thread 3 in contact with the thread contact portion 23 , thereby adjusting the tension of the upper thread 3 . Preferably, the wire tension adjuster 21 is pivotally connected to a rotation shaft 31 of a pickup driver 30 (described later), but not limited thereto. Alternatively, the wire tension adjuster 21 may be connected to the rotation shaft 31 and rotate integrally with the rotation shaft 31 .

The pickup 25 is located between the wire tension regulator 21 and the bottom of the wire supply 5 . Furthermore, the picker 25 is connected to the rotational axis 31 of the picker drive 30 . Here, the axis of the rotating shaft 31 is spaced apart from the thread conveyance path of the upper thread 3 through the spacer portion 15 by a predetermined interval. Also, the picker 25 is formed with a thread passing hole serving as a holder 27 to hold the upper thread 3 passing through the spacer portion 15 and passing through the hole. Alternatively, one end of the pick-up member 25 may be formed with a semicircular holding groove instead of the thread passing hole, so as to hold the upper thread 3 passing through the spacer portion 15 .

The picker 25 is formed with a receiving groove 29 to accommodate the wire tension adjuster 21 . Further, the picker 25 is rotated by the pick-up driver 30 , and partially winds the upper thread 3 onto the thread contact portion 23 of the thread tension adjuster 21 .

In this embodiment, the pick-up driver 30 includes a rotary shaft 31 connected to the pick-up member 25 for rotation, a drive shaft 33 spaced apart from the rotary shaft 31 by a predetermined axis distance, a shaft driver that rotates the drive shaft 33, and a rotational force from the drive The shaft 33 is transmitted to the power transmission member of the rotary shaft 31 .

The rotating shaft 31 is rotatably connected to the frame 19 supported by the push rod 17 . The rotating shaft 31 has a first end connected to the pickup 25 and a second end connected to the driven pulley 35 .

The drive shaft 33 is parallel to the rotation shaft 31 and is rotatably connected to the frame 19 . The driving shaft 33 has a first end connected to a driving pulley 37 corresponding to the driven pulley 35 . The driving pulley 37 and the driven pulley 35 are connected by a belt 39 to transmit rotational force from the driving shaft 33 to the rotating shaft 31 .

Furthermore, the rotation shaft 31 and the drive shaft 33 are rotatably supported by bearings 41 accommodated and supported in the frame 19 .

The drive shaft has a second end connected to a drive cam 43 serving as a shaft driver element to rotate the drive shaft 33 . Furthermore, a cam profile 43 a is formed on the outer circumference of the drive cam 43 and is curved along the longitudinal direction of the drive cam 43 . A drive pin 45 is housed in the cam profile 43a. The driving pin 45 has a first end connected to a driving means (not shown), so that when the driving pin 45 is driven by the driving means to move along the cam profile 43a of the driving cam 43, the driving cam 43 rotates.

Alternatively, the pick-up drive 30 may be obtained by directly connecting a motor or a hydraulic cylinder and the aforementioned structure to the pick-up 25 so as to rotate the pick-up 25 . Furthermore, in this embodiment, the driving pulley 37, the driven pulley 35, and the belt 39 are used as power transmission members, but are not limited thereto. Alternatively, a pair of gears meshing with each other may be used to transmit the rotational force of the drive shaft 33 to the rotation shaft 31 .

In addition, the thread feeding device 1 for an automatic embroidery machine according to the embodiment of the present invention includes a swing bracket 71, which swings to enhance and release the tension of the upper thread 3; a bracket driver 81, which is used to drive the swing bracket 71, to place the upper thread 3 on the swing bracket 71; and a swing bracket elastic member 91 for swinging the swing bracket 71 with predetermined elasticity.

The swing bracket 71 is connected to a bush 75 which is rotatably fitted on the outer circumference of the rotation shaft 31 of the pickup driver 30 . The swing bracket 71 has a semicircular upper end 71a; a lower end 71b spaced apart from the upper end 71a at a predetermined interval, and a bushing 75 penetrates into the lower end 71b; and a connecting portion 71c connecting the upper end 71a with the edge of the lower end 71b. connected, and spaced apart the upper end 71a from the lower end 71b. The upper end 71 a of the swing bracket 71 has a thread holder 73 in which the upper thread 3 going from the thread tension adjuster 21 toward the needle 13 is held. In this embodiment, the wire passing hole is formed as the wire holder 73 . Alternatively, the upper end 71a of the swing bracket 71 is formed with a semicircular holding groove to replace the thread passing hole, so that the upper thread 3 is placed on the thread holding groove.

The stand driver 81 moves the thread holder 73 of the swing stand 71 to the thread transfer path, thereby driving the swing stand 71 to place the upper thread 3 on the thread holder 73 . The carriage driver 81 includes a carriage driving cam 8 formed with a predetermined cam profile 83a; a moving pin 85 which moves along the cam contour 83a of the carriage driving cam 83; and a cam driver 87 for driving along the carriage. The cam profile 83 a of the cam 83 moves the moving pin 85 , thereby rotating the carriage drive cam 83 .

A cam profile 83 a is formed on the outer circumference of the carriage driving cam 83 , inclined at a predetermined angle along the longitudinal direction of the carriage driving cam 83 with respect to the axis of the carriage driving cam 83 , and is rotatably connected to the bush 75 .

The cam profile 83a of the carriage driving cam 83 accommodates the moving pin 85 which moves along the cam profile 83a.

The moving pin 85 is connected to a cam driver 87 at one end of the moving pin 85 . Thus, when the cam driver 87 drives the moving pin 85 to move along the cam profile 83a of the carriage driving cam 83, the carriage driving cam 83 rotates. Here, a motor, a hydraulic cylinder, or the like may be used as the cam driver 87 .

The swing bracket elastic member 91 is located between the swing bracket 71 and the bracket driver 81 . The swing bracket elastic member 91 has a first end supported by the bracket driving cam 83 and a second end supported by the swing bracket 71 . Accordingly, the swing bracket 71 swings within a predetermined portion by the swing bracket elastic member 91 . In this embodiment, a coil spring is used as the swing bracket elastic member 91, but it is not limited thereto. Alternatively, a coil spring or the like and a coil spring may be used as the swing bracket elastic member 91 .

In addition, the bracket driver 81 may include a cam elastic member 95 for elastically rotating the bracket driving cam 83 so that the bracket driving cam 83 returns to the original position of the driving cam 83 . The cam elastic member 95 has a first end supported by the bracket driving cam 83 and a second end supported by the frame 19 . In this embodiment, a coil spring is used as the cam elastic member 95, but it is not limited thereto. Alternatively, a coil spring or the like and a coil spring may be used as the cam elastic member 95 .

Therefore, when the upper thread 3 is replaced, the cam driver 87 drives the thread holder 73 of the swing frame 71 to move on the thread conveying path, so the moving pin 85 moves along the cam profile 83a of the frame driving cam 83 . The carriage drive cam 83 is then rotated and allows the wire holder 73 to communicate with the holder 27 of the pickup 25 . At this time, the thread is not disturbed in the swing bracket 71 even if the picker 25 is rotated to wind the upper thread 3 around the thread tension adjuster 21 .

After the upper thread 3 is held in the thread holder 73 of the swing bracket 71, when the cam driver 87 drives the wire holder 73 of the swing bracket 71 to be misaligned with the holder 27 of the pickup member 25, and the moving pin 85 is driven along the bracket When the cam profile 83 a of the cam 83 moves, the swing bracket 71 returns to the initial position of the swing bracket 71 by the elastic force of the cam elastic member 95 . Therefore, the upper thread 3 passing through the swing bracket 71 swings by the elastic force of the swing bracket elastic member 91 and the tension of the upper thread 3 adjusted by the thread tension adjuster 21, so that the tension of the upper thread 3 is enhanced or released.

Here, the swing bracket 71, the bracket driver 81, the swing bracket elastic 91, and the cam elastic 95 may be selectively provided.

With this structure, when the upper thread 3 is replaced or cut due to color change, or the upper thread 3 is cut at the time of embroidery, the upper thread supplied to the needle 13 is adjusted using the thread feeding device 1 according to the first embodiment of the present invention. 3 The tension process is described below.

First, the pick-up driver 30 is driven to place the holder 27 of the pick-up piece 25 onto the wire transport path of the spacing portion 15 between the wire supply member 5 and the wire guide member 8 . Simultaneously, the swing bracket 71 is rotated to align the wire holder 73 of the swing bracket 71 with the holder 27 of the picker 25 . The process of placing the upper thread 3 on the swing stand 71 will be described later.

Next, one upper thread 3 selected from a plurality of spare upper threads of different colors is supplied from the thread supply part 5 through the thread supply groove 6 of the thread supply part 5, the spacer part 15, the thread guide groove 9 of the thread guide part 8 by compressed air pin 13.

As shown in FIGS. 5A and 5B , the upper thread 3 coming out of the thread supply groove 6 passes through the holder 27 of the picker 25 through the thread holder 73 of the swing bracket 71 , and then is guided to the thread guide groove 9 of the thread guide 8 .

Then, the picker 25 is rotated in one direction to partially wind the upper thread 3 on the thread contact portion 23 of the thread tension adjuster 21 .

That is, a driving device (not shown) drives the driving pin 45 to move along the cam profile 43 a of the driving cam 43 , thereby rotating the driving cam 43 . As the driving cam 43 rotates, the driving shaft 33 rotates and the rotational force of the driving shaft 33 is transmitted to the rotating shaft 31 through the driving pulley 37 and the driven pulley 35 connected by the belt 39, thereby rotating the pickup 25 in one direction. .

As the picker 25 rotates, as shown in FIGS. 6A and 6B , the upper thread 3 held by the holder 27 of the picker 25 is picked up from the thread conveying path of the spacer portion 15, and then wound around the thread of the thread tension adjuster 21. Contact part 23. Preferably, the picker 25 rotates once to wind the upper thread 3 on the thread contact portion 23 once.

Therefore, the upper thread 3 wound on the thread contact portion 23 of the thread tension adjuster 21 is resisted when passing through the thread contact portion 23 of the thread tension adjuster 21, thereby increasing the tension of the upper thread 3 moving along the thread contact portion 23.

After the upper thread 3 transferred to the thread guide 8 through the thread tension regulator 21 is placed on the thread holder 73 of the swing frame 71, the swing frame 71 returns to the initial position of the swing frame 71 by the elastic force of the cam elastic member 95, and Swing by the elastic force of the elastic member 91 of the swing bracket. Therefore, the tension of the upper thread 3 passing through the swing bracket 71 is not only adjusted by the tension of the upper thread 3 by the thread tension adjuster 21, but also strengthened and released by the swing of the swing bracket 71.

Here, the process of placing the upper thread 3 on the thread holder 73 of the swing stand 71 is as follows.

As shown in FIG. 7A , the cam driver 87 drives the wire holder 73 of the swing bracket 71 to align with the holder 27 of the picker 25 and moves the moving pin 85 along the cam profile 83a of the bracket driving cam 83 . As shown in Figures 8A, 8B, 9A, 9B, 10A and 10B, as the moving pin 85 moves upward along the cam profile 83a of the bracket driving cam 83, the bracket driving cam 83 rotates, thereby causing the swing bracket 71 rotate. Accordingly, the wire holder 73 of the swing bracket 71 is aligned with and communicates with the holder 27 of the picker 25, as shown in FIG. 7B.

Therefore, one upper thread 3 selected from a plurality of spare upper threads of different colors is supplied by compressed air from the thread supply groove 6 of the thread supply member 5, and the upper thread 3 is held on the thread of the swing bracket 71 by the holder 27 of the picker 25. Holder 73 and transported to the needle 13 through the wire guide groove 9 of the wire guide 8 .

In addition, after the upper thread 3 is held on the thread holder 73 of the swing stand 71, the cam driver 87 drives the thread holder 73 of the swing stand 71 to be misaligned with the holder 27 of the picker 25, and the moving pin 85 is moved along the stand. The cam profile 83a of the driving cam 83 moves downward. Then, as shown in FIG. 8A , the swing bracket 71 returns to the original position of the swing bracket 71 by the elastic force of the cam elastic member 95 and swings within a predetermined portion, thereby increasing and releasing the tension of the upper thread 3 .

Meanwhile, FIG. 11 is a partially enlarged perspective view of a thread feeding device for an automatic embroidery machine according to a second embodiment of the present invention, and FIG. 12 is an exploded perspective view of FIG. 11 . As shown in the drawing, contrary to the first embodiment, in the thread feeding device 1' for an automatic embroidery machine according to the second embodiment of the present invention, the swing bracket 71' that swings to strengthen and release the upper thread 3 is rotatable. Instead of being connected to the bushing 75 of the pick-up drive 30, the auxiliary frame 51 is connected vertically to the frame 19 by the pivot pin 53. Here, the swing bracket 71' swings in a vertical direction corresponding to the wire tensioning member 11, such as between top dead center and bottom dead center.

The swing bracket 71' according to the second embodiment of the present invention includes a pin connection portion 71a' to which the pivot pin 53 is connected, and a tension plate 71b' extending from one side of the pin connection portion 71a'.

The tension plate 71b' of the swing bracket 71' has a thread holder 73' in which the upper thread 3 going from the thread tension adjuster 21 toward the needle 13 is held. In this embodiment, the wire through hole is formed as a wire holder 73'. Moreover, the thread holder 73' allows the thread pick-up lever 7 to pass through the thread holder 73', wherein the thread pick-up lever 7 is used as a thread pick-up member for picking up the thread supply groove 6 and thread guide when replacing the upper thread 3. The groove 9 conveys the upper thread 3 to the needle 13 and places the upper thread 3 on the thread tensioner 11 . Here, the wire pick-up rod 7 is installed in the wire guide groove 9 at a predetermined angle, and reciprocates within the rod receiving hole 10 formed in the wire guide 8 .

Contrary to the first embodiment, the carriage driver 81' according to the second embodiment of the present invention includes a tension plate clutch 88 close to and spaced apart from the pin connection portion 71a' of the swing carriage 71', and a clutch driver that moves the tension plate clutch 88 up and down. 89.

In this embodiment, a hydraulic cylinder is used as the clutch driver 89 that expands and contracts through hydraulic pressure and reciprocates the tension plate clutch 88 . Alternatively, a motor, cam gear, solenoid, etc. may be used as the clutch driver 89 to drive the tension plate clutch 88 .

In addition, the swing bracket elastic member 91' according to the second embodiment of the present invention has a first end supported by the pivot pin 53 and a second end supported by the swing bracket 71'. The swing bracket elastic member 91' swings the swing bracket 71' within a predetermined portion, that is, between the top dead center and the bottom dead center. In this embodiment, a torsion spring is used as the swing bracket elastic member 91'.

Meanwhile, the swing bracket control pin 97 is located between the swing bracket 71' and the tension plate clutch 88, and is connected with the long hole 51a of the auxiliary frame 51, thereby serving as a tension adjuster to control the swing of the swing bracket 71'. Here, the swing bracket control pin 97 is in close proximity to the pin connection portion 71a' of the swing bracket 71'. As shown in FIGS. 14A and 14B, when the tension of the upper thread 3 held in the swing bracket 71' thread holder 73' increases, the swing bracket control pin 97 is spaced apart from the pin connection portion 71a' of the swing bracket 71', and When the tension of the upper thread 3 held in the thread holder 73' of the swing stand 71' is released, the swing stand control pin 97 contacts the pin connection portion 71a' of the swing stand 71'. In addition, the swing bracket control pin 97 moves along the long hole 51a of the auxiliary frame 51 to control the bottom dead center of the swing bracket 71', that is, to adjust the tension of the upper thread 3 transmitted to the needle 13 through the thread tensioner 11.

With this structure, the tension of the upper thread 3 supplied to the needle 13 using the thread feeding device 1' according to the second embodiment of the present invention is adjusted as follows.

According to the second embodiment, the process of winding the upper thread 3 around the thread contact portion 23 of the thread tension adjuster 21 is the same as the foregoing process according to the first embodiment, so it is necessary to omit repeated description. Next, a process of adjusting the tension of the upper thread 3 held in the thread holder 73' of the swing frame 71' will be described.

In the state where the wire tensioner is placed at the bottom dead center, the swing bracket 71' is lifted up and the clutch driver 89 is driven, so that the wire holder 73' of the swing bracket 71' communicates with the rod receiving hole 10 of the wire guide 8. In addition, one upper thread 3 selected from a plurality of upper threads of different colors is supplied by compressed air from the thread supply groove 6 of the thread supply member 5, and the upper thread 3 is held by the thread supply groove 6 of the thread supply member 5 and the picker 25. The receptacle 27 is held in the wire holder 73' of the swing bracket 71', and is then transferred to the needle 13 through the wire guide groove 9 of the wire guide 8. At this time, the upper thread 3 conveyed through the thread guide groove 9 is held by the thread pickup lever 7 accommodated in the lever accommodation hole 10 , and conveyed to the needle 13 .

In addition, the thread pick-up lever 7 moves forward near the thread tension member 11 so that the thread pick-up lever 7 passes the thread holder 73' of the swing bracket 71', thereby placing the upper thread 3 on the thread tension member 11.

After the upper thread 3 is placed on the thread tensioner 11, the thread pick-up lever 7 moves backward to be spaced from the thread tensioner 11, so that the thread pick-up lever 7 is released from the thread holder 73' of the swing bracket 71'. out, and accommodated in the rod accommodation hole 10 of the wire guide 8 .

In addition, after the upper thread 3 is held in the thread holder 73' of the swing frame 71', the clutch driver 89 is driven so that the thread holder 73' of the swing frame 71' does not come into contact with the rod accommodating hole 10 of the thread guide 8. communicated, so that the swing bracket 71' is lowered. Then, the swing bracket 71' returns to the initial position of the swing bracket 71' by the elastic force of the swing bracket elastic member 91'. That is, the wire holder 73 is located at the top dead center of the swing bracket 71'.

Meanwhile, the upper thread 3 transmitted to the needle 13 through the thread tension adjuster 21 and the thread guide 8 is held by the thread pick-up lever 7, and the upper thread 3 is held in the thread tensioner 11 and the thread holder 73 of the swing bracket 71' , and then the tension of the upper thread 3 is strengthened and released by the swing of the thread tensioner 11.

As shown in Figures 13A and 14A, when the thread tensioning member 11 is at the top dead center, the tension plate 71b' of the swing bracket 71' is also at the top dead center, so the tension of the upper thread is enhanced. On the other hand, as shown in Figures 13B and 14B, when the thread tension member 11 is at the bottom dead center, the tension plate 71b' of the swing bracket 71' is also at the bottom dead center, so the tension of the upper thread is released.

Therefore, the tension of the upper thread 3 passing through the swing bracket 71' is not only adjusted by the tension of the upper thread 3 by the thread tension regulator 21, but also by the interaction between the swing support 71' and the thread tension member 11.

In particular, in the thread feeding device 1' according to the second embodiment of the present invention, compared with the second embodiment, the swing bracket 71' is closer to the needle 13, so that the tension of the upper thread 3 can be adjusted more effectively.

Therefore, when the picker rotates while keeping the upper thread spaced apart from the axis of the rotary shaft, the upper thread is partially wound on the thread tension adjuster, and while passing through the thread tension adjuster, the upper thread is resisted, thereby Easily adjust the tension of the upper thread and reduce working time.

Meanwhile, those skilled in the art should understand that the present invention is not limited to single-needle automatic embroidery machines, and can be applied to multi-needle automatic embroidery machines.

As described above, the present invention provides a thread feeding device for an automatic embroidery machine having an improved structure for adjusting the tension of the upper thread, thereby easily adjusting the tension of the upper thread and reducing working time.

Claims (7)

1. A thread feeding device for an automatic embroidery machine, said device providing upper thread from a thread supply to a needle, the device comprising: A thread tension adjuster having a thread contact portion that allows the upper thread to be at least partially wrapped around and in contact with the thread contact portion, and the thread tension adjuster resists the surface thread passing through the thread contact portion. thread to adjust the tension of the upper thread; a picker for rotating about a predetermined rotation axis, and rotates while keeping the upper thread spaced from the rotation axis to place the upper thread on the thread tension adjuster; and A pick-up driver that rotates the pick-up member for at least partially winding the upper thread around the thread contact portion. 2. The wire feeding device of claim 1, wherein the pick-up drive comprises: a rotating shaft, which is connected to and rotates with the pick-up member; a drive shaft spaced a predetermined axial distance from said rotating shaft; a shaft drive that rotates the drive shaft; and A power transmission member is located between the rotation shaft and the drive shaft and transmits a rotation force from the drive shaft to the rotation shaft. 3. The wire feeding device of claim 1, further comprising: a swing bracket including a thread holder for holding the upper thread transmitted from the thread tension adjuster to the needle, and the swing bracket swings to increase and release the tension of the upper thread; a stand driver that drives the swing stand to move the thread holder of the swing stand onto a thread conveyance path and place the upper thread on the thread holder; and The elastic part of the swing bracket elastically makes the swing bracket swing. 4. The wire feeding device of claim 1, wherein the carriage driver comprises: a bracket driving cam having a cam profile formed on a side surface of the bracket driving cam; a travel pin that moves along said cam profile of said carriage drive cam; and a cam driver for rotating said carriage drive cam by moving said travel pin along said cam profile of said carriage drive cam, Wherein, the swing bracket elastic member has a first end supported by the bracket driving cam and a second end supported by the swing bracket, and the swing bracket elastic member swings the swing bracket. 5. The wire feeding device according to claim 4, wherein the bracket driver further comprises a cam elastic member elastically rotating the bracket driving cam to return to an original position. 6. The wire feeding device of claim 3, further comprising: a thread tensioner that swings at a predetermined portion to increase and release the tension of the upper thread; and a thread picker that picks up the upper thread conveyed from the thread tension adjuster to the needle working part, and places the upper thread on the thread tensioner and the thread holder , Wherein, the swing bracket swings in a vertical direction corresponding to the wire tensioning member. 7. The wire feeding device according to claim 6, wherein, when the wire tensioning member is located at the top dead center of the wire tensioning member, the wire holder is located at the top dead center of the swing bracket, When the wire tensioning member is located at the bottom dead center, the wire retainer is located at the bottom dead center of the swing support.

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