KR100639356B1 - Thread feeding apparatus for an automatic embroidering machine - Google Patents

Abstract

The present invention relates to an upper thread supplying device for an automatic embroidery machine for supplying the upper thread from the thread supply part to the needle work part, the upper thread having a thread contact part at least partially wound and contacting, and giving resistance to the upper thread passing through the thread contact part. A mounting force regulator for adjusting tension; A drawing member rotatably installed about a predetermined rotation axis, the drawing member capable of winding the upper thread at a position spaced apart from the rotation axis to wind the upper thread on the mounting tension regulator; And a drawing member driving unit for rotating the drawing member so that the upper thread is at least partly wound around the thread contact portion. Thereby, the tension of the upper thread can be easily adjusted, and the working time can be shortened.

Description

Upper thread feeder for automatic embroidery machine {THREAD FEEDING APPARATUS FOR AN AUTOMATIC EMBROIDERING MACHINE}

1 is a schematic configuration diagram of an upper thread supply apparatus for an automatic machine according to a first embodiment of the present invention,

2 is a partial side view of the upper thread feeder for the automatic machine of FIG. 1;

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

4 is an exploded perspective view of FIG. 3;

Figures 5a and 5b, 6a and 6b is a partially enlarged perspective and side cross-sectional view showing a step of winding the upper thread to the mounting force regulator,

7A and 7B are plan views illustrating a process in which the upper thread is caught by the lead member and the swinging bracket;

8a and 8b, 9a and 9b, 10a and 10b is a side view and a plan view showing the operation of the bracket drive step by step,

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

12 is an exploded perspective view of FIG. 11;

13A and 13B are partially enlarged perspective views illustrating stepwise operations of the thread take-up and the swinging bracket of FIG. 11;

14A and 14B are cross-sectional views illustrating operation processes of the take-up and swing bracket of FIG. 11.

Explanation of symbols on the main parts of the drawings

1: upper thread supply device 3: upper thread

5: Seal supply unit 8: Seal guide

15: spaced 21: mounting force regulator

23: seal contact 25: drawing member

27: holding part 30: drawing member drive unit

71,71 ': Oscillating bracket 73,73': Thread catching part

81,81 ': Bracket drive part 83: Bracket drive cam

85: moving pin 91,91 ': elastic member for rocking bracket

95: elastic member for the cam

The present invention relates to an upper thread supply apparatus for an automatic machine, and more particularly, to an upper thread supply apparatus for an automatic machine, in which the tension adjusting structure of the upper thread is improved.

An automatic embroidery machine is a kind of automatic sewing machine which automatically embroiders a predetermined pattern and trademark by using a thread of various colors and is automatically embroidered by a program pre-woven on a label of clothing or shoes.

In general, the automatic embroidery machine includes a head stem provided in front of the fixed frame, a upper thread feeder which is attached to the head stem to supply upper threads of various colors from a plurality of failures in a direction in which embroidery work is performed, and the upper threads supplied in this way. It includes a needle working portion for sewing embroidery work.

In addition, the automatic machine is classified into a single needle and a multi needle according to the number of needles mounted on the upper thread feeder and the needle working part.

The single needle automatic embroidery machine has a single needle feeder for supplying any one of several different colors of upper threads from a plurality of bobbins to the needle work unit, and a single needle to sew a single upper thread to be embroidered. It includes a needle working portion having.

The multi-needle embroidery machine has a needle thread feeding device for supplying the thread of different colors from the plurality of thread bobbins to the needle work part, and a plurality of needles for sewing one of the plurality of thread threads to be embroidered. It includes a needle working part.

In the following description, an automatic embroidery machine for a single needle will be described.

The invention of the conventional single needle automatic machine is disclosed in "Upper thread feeder for automatic machine" in Korean Patent Laid-Open No. 2002-0068028.

The conventional upper thread supply device for an automatic embroidery machine includes a head stem having a needle work portion; A yarn supply unit for supplying any one selected from a plurality of yarns having different colors; A first guide tube receiving the thread from the thread supply portion, and an upper end portion having a predetermined distance along the axial direction with respect to the first guide tube, the lower end portion being adjacent to the needle work portion provided in the head stem; A guide tube assembly having a second guide tube; The rocking lever oscillating in a plane parallel to the supply path of the seal and the free end portion of the rocking lever are transversely coupled to the rocking direction of the rocking lever through the spacing according to the rocking motion of the rocking lever. Including a thread take-up member having a thread-hanging member that reciprocates and relaxes the thread, it is possible to eliminate the curved path to the supply path of the yarn while unifying the headstem to smoothly supply the yarn.

In addition, the conventional upper thread supply device for an automatic embroidery machine further includes a mounting force holding unit provided on an upper side of the head stem to adjust tension of each upper thread extending from a plurality of thread bobbins.

However, the mounting force holding portion of the upper thread supply device for the conventional automatic embroidery machine is configured to adjust the tension of all of the plurality of upper threads extending from the bobbin, which is not only complicated in structure but also allows the user to mount each upper thread one by one. Since the tension must be adjusted to each other by coupling to, the tension control operation of the upper thread is not easy, there is a problem that takes a long time working.

Accordingly, it is an object of the present invention to provide an upper thread feeder for an automatic machine which can easily adjust the tension of the upper thread and can shorten the working time.

In order to achieve the above object, the present invention, in the upper thread supply apparatus for an automatic machine for supplying the upper thread from the thread supply unit to the needle work unit, the upper thread has a thread contact portion which at least partly wound and contact, passing through the thread contact portion A mounting force adjusting body for adjusting the tension of the upper thread by giving resistance to the upper thread; A drawing member rotatably installed about a predetermined rotation axis, the drawing member being capable of winding the upper thread on the mounting force adjusting body by rotating while holding the upper thread at a position spaced apart from the rotation axis; It provides an upper thread supply apparatus for an automatic machine, characterized in that the upper thread comprises a drawing member drive unit for rotating the drawing member so that the upper thread is at least partly wound around the thread contact portion.

Here, the drawing member driving unit is made of any one of a motor and a fluid pressure cylinder directly connected to the drawing member, or the drawing member driving unit, a rotating shaft coupled to the drawing member to rotate, and the rotation axis and a predetermined shaft distance And a driving shaft spaced apart from each other, a soccer moving part for rotating the driving shaft, and a power transmission unit provided between the rotating shaft and the driving shaft to transmit rotational force of the driving shaft to the rotating shaft.

The upper thread supplying device for an automatic machine according to the present invention includes: a rocking bracket which has a thread catching part that is caught by the upper thread directed from the mounting force adjusting member to the needle work part, and swings to tension and relax the upper thread; A bracket driving unit which drives the rocking bracket to move the thread locking portion of the rocking bracket on a thread moving path so that the upper thread is caught by the thread locking portion; The rocking bracket may further include an elastic member for the rocking bracket that provides a predetermined elastic force to the rocking bracket so that the rocking bracket swings.

Here, the bracket driving unit is made of any one of a motor, a fluid pressure cylinder directly connected to the disk, or the bracket driving unit, a bracket driving cam having a predetermined camp profile on the side; A moving pin moving along the camp profile of the bracket driving cam; And a cam driving unit for rotating the bracket driving cam by moving the moving pin along the camp profile of the bracket driving cam, wherein the oscillating bracket elastic member has one end supported by the bracket driving cam and the other end of the swing driving cam. It is supported by a bracket to swing the rocking bracket.

In addition, the bracket driving unit may further include a cam elastic member for rotating the bracket driving cam with a predetermined elastic force so that the bracket driving cam returns to its original position.

On the other hand, the swinging a predetermined section and the thread take-up for tensioning and loosening the upper thread, and the thread take-out portion for drawing the upper thread to the needle working portion from the mounting force adjusting body to walk the thread take-up and the thread catching part, The rocking bracket is preferably rocked in the vertical direction corresponding to the thread take-up.

When the thread take-up is located at the top dead center, the thread catching part is located at the top dead center of the swing bracket, and when the thread take-up is located at the bottom dead center, the thread catching part is preferably located at the bottom dead center of the swing bracket.

Hereinafter will be described in detail with reference to the accompanying drawings for a single needle automatic machine as an embodiment of the present invention.

Prior to the description, in various embodiments, components having the same configuration will be representatively described in the first embodiment using the same reference numerals, and in other embodiments, only the configuration different from the first embodiment will be described. do.

As shown in Figures 1 to 4, the upper thread supply device 1 for an automatic machine according to the first embodiment of the present invention, for supplying any one of the upper thread (3) selected from the plurality of upper thread having a different color The thread supply part 5, the thread guide 8 which guides the upper thread 3 supplied from the thread supply part 5 to the needle 13, and the upper thread which swings a predetermined section and passes through the thread guide 8 ( 3) has a thread take-up 11 to tension and relax.

The thread supply part 5 has a thread supply path 6, and supplies the upper thread 3 of any one selected from the plurality of upper threads having different colors to the seal guide 8 by compressed air.

The thread guide 8 is formed with a thread guide path 9 for guiding the upper thread 3 supplied from the thread supply part 5. The seal guide 8 in this embodiment is made of a block having a rectangular cross section, but may be made of a tubular body having various cross-sectional shapes.

On the other hand, between the yarn supply portion 5 and the seal guide 8 is provided with a spaced portion 15 spaced apart at a predetermined interval along the thread movement path.

The spacer 15 passes through the mounting force adjusting body 21 for adjusting the tension of the upper thread 3 by partially winding and contacting the upper thread 3 passing through the spacer 15. To take out the upper thread (3) is rotated and the withdrawal member 25 for winding the upper thread (3) is provided on the mounting force adjusting member (21).

The mounting force adjusting member 21 has a disc shape, and has a thread contact portion 23 formed in a recess along the outer circumference thereof so that the upper thread 3 is partially wound and contacted. The mounting force adjusting member 21 is receivably installed in the receiving groove 29 of the drawing member 25 to be described later. As the upper thread 3 contacts and passes through the thread contact portion 23, resistance is generated to adjust the tension of the upper thread 3. On the other hand, the mounting force adjusting body 21 is preferably rotatably coupled to the rotary shaft 31 of the drawing member drive unit 30 to be described later, may be coupled to the rotary shaft 31 to rotate integrally with the rotary shaft 31. have.

The drawing member 25 is provided between the mounting force regulator 21 and the lower end of the thread supply part 5. The lead member 25 is coupled to the rotary shaft 31 of the lead member drive unit 30, which will be described later, and the movement path of the upper thread 3 passing through the axis line and the separation unit 15 of the rotary shaft 31 is a predetermined interval. Spaced apart. In addition, although the through-hole through which the upper thread 3 passes is formed as a grip portion 27 for holding the upper thread 3 passing through the separation part 15, the drawing member 25 is withdrawn instead of the through-hole. A semicircular arc-shaped gripping groove, one side of which is opened at one end of the member 25, may be gripped by the upper thread 3 passing through the spaced portion 15.

In addition, the drawing member 25 has a receiving groove 29 for receiving the mounting force adjusting member 21, the drawing member 25 is rotated by the drive of the drawing member drive unit 30 to drive the mounting force adjusting body. The upper thread 3 is partially wound up to the thread contact part 23 of (21).

The drawing member driving unit 30 according to the present embodiment includes a rotating shaft 31 coupled to the drawing member 25 to rotate, a driving shaft 33 spaced apart from the rotating shaft 31 at a predetermined shaft distance, and a driving shaft. And a power transmission unit provided between the rotating shaft 31 and the driving shaft 33 to transmit the rotational force of the driving shaft 33 to the rotating shaft 31.

The rotating shaft 31 is rotatably coupled to the frame 19 supported by the head stem 17. One end of the rotating shaft 31 is coupled to the drawing member 25, the other end is coupled to the driven pulley 35 as a power transmission.

The drive shaft 33 is parallel to the rotating shaft 31 and rotatably coupled to the frame 19. One end of the drive shaft 33 is coupled with a drive pulley 37 having a standard corresponding to the driven pulley 35. The driving pulley 37 and the driven pulley 35 are connected to each other by the belt 39 to transmit the rotational force of the drive shaft 33 to the rotation shaft 31.

The rotating shaft 31 and the drive shaft 33 are rotatably supported by the bearing 41 accommodated in the frame 19.

The other end of the drive shaft 33 is coupled to the drive cam 43, which is one component of the soccer moving part for rotating the drive shaft 33. On the outer circumferential surface of the drive cam 43 is formed a camp profile 43a having a curved shape along the longitudinal direction of the drive cam 43, and the drive pin 45 is housed in the camp profile 43a. One end of the driving pin 45 is connected to a driving means (not shown). When the driving pin 45 moves along the camp profile 43a of the driving cam 43 by driving the driving means, the driving cam 43 is to rotate.

Although not shown, the drawing member driving unit 30 is not configured as in the above-described embodiment, and the drawing member driving unit 30 is connected to the drawing member 25 by directly connecting either the motor or the fluid pressure cylinder with the drawing member 25. It is also possible to rotate 25. In addition, in the present embodiment, a pair of drive pulleys 37, driven pulleys 35, and a belt 39 are disclosed as a power transmission unit, but a pair of gears are engaged to engage the rotational force of the drive shaft 33 by a rotational shaft. You can also pass on 31.

On the other hand, the upper thread supply device 1 for an automatic embroidery machine according to the present invention, the swinging bracket 71 for swinging to tension and relax the upper thread 3, and the swinging thread 71 so that the upper thread 3 is caught by the swinging bracket 71. It further includes a bracket drive unit 81 for driving the bracket 71, and an elastic member 91 for the swing bracket for swinging the swing bracket 71 with a predetermined elastic force.

The swing bracket 71 is coupled to the bush 75 rotatably coupled to the outer circumference of the rotation shaft 31 of the lead member driving unit 30. The swing bracket 71 has a semicircular upper end portion 71a, a lower end portion 71b disposed at a predetermined distance from the upper end portion 71a, and a bush 75 coupled therethrough, and an upper end portion 71a and a lower end portion 71b. One side edges of the () are connected to each other and has a connecting portion (71c) for maintaining the interval between the upper portion (71a) and the lower portion (71b). The upper end portion 71a of the swinging bracket 71 is provided with a thread catching portion 73 for engaging the upper thread 3 from the mounting force adjusting member 21 toward the needle 13. In this embodiment, the thread through hole is formed as a thread catching portion 73, but instead of the thread through hole, a semi-circular arc-shaped thread catching groove having one side opened at the upper end portion 71a of the swing bracket 71 is provided. It is also possible to form the upper thread (3) in the thread catching groove.

The bracket driving unit 81 drives the swing bracket 71 to move the thread catching portion 73 of the swing bracket 71 onto the thread moving path so that the upper thread 3 is caught by the thread catching portion 73. The bracket driving unit 81 includes a bracket driving cam 83 having a predetermined camp profile 83a formed on a side surface thereof, a moving pin 85 moving along the camp profile 83a of the bracket driving cam 83. , Has a cam driving portion 87 for moving the moving pin 85 along the camp profile 83a of the bracket driving cam 83 to rotate the bracket driving cam 83.

The bracket drive cam 83 is formed on the outer circumferential surface of the camp profile 83a which forms a predetermined inclination along the longitudinal direction with respect to the axis of the bracket drive cam 83, and is rotatable around the bush 75. Are combined.

The camping profile 83a of the bracket driving cam 83 is housed with a moving pin 85 that moves along the camp profile 83a.

The cam driving unit 87 is connected to one end of the moving pin 85, and the driving pin 85 is driven along the camp profile 83a of the bracket driving cam 83 by driving the cam driving unit 87. When moved, the bracket drive cam 83 is to rotate. Here, a motor, a fluid pressure cylinder, or the like may be applied as the cam driving unit 87.

An elastic member 91 for the rocking bracket is provided between the rocking bracket 71 and the bracket driving portion 81. One end of the swing bracket elastic member 91 is supported by the bracket driving cam 83, and the other end thereof is supported by the swing bracket 71. Thus, the swing bracket 71 is rocked within a predetermined section by the swing member elastic member 91. In the present embodiment, the coil spring is disclosed as the elastic member 91 for the swinging bracket, but a spiral spring may be applied in addition to the coil spring.

In addition, the bracket drive unit 81 may further include a cam elastic member 95 for rotating the bracket drive cam 83 with a predetermined elastic force so that the bracket drive cam 83 returns to its original position. One end of the cam elastic member 95 is supported by the bracket driving cam 83 and the other end is supported by the frame 19. In this embodiment, the coil spring is disclosed as the cam elastic member 95. In addition to the coil spring, a spiral spring may be applied.

Accordingly, when the upper thread 3 is replaced, the cam driving part 87 is driven to move the moving pin 85 to the bracket driving cam 83 so that the thread catching part 73 of the swing bracket 71 is positioned on the thread moving path. When moving along the camp profile 83a, the bracket driving cam 83 rotates so that the thread catching portion 73 of the rocking bracket 71 communicates with the grip portion 27 of the lead member 25. However, when the takeout member 25 is wound to wind the thread on the mounting force adjusting member 21, the thread is not caught by the swinging bracket 71.

Then, after the thread is caught by the thread catching portion 73 of the rocking bracket 71, the cam catching portion 73 of the rocking bracket 71 is not coaxial with the gripping portion 27 of the lead member 25. When the driving unit 87 is driven to move the moving pin 85 along the camp profile 83a of the bracket driving cam 83, the swing bracket 71 is rotated by the elastic force of the cam elastic member 95. It will return to the position. Thus, the upper thread 3 passing through the rocking bracket 71 is rocked and tensioned by the elastic force of the elastic member 91 for the rocking bracket as well as the tension of the thread itself applied by the mounting force adjusting member 21.

Here, the rocking bracket 71, the bracket driving unit 81, the rocking bracket elastic member 91 and the cam elastic member 95 may be provided as necessary.

By this configuration, when the upper thread 3 is replaced or single threaded to replace the upper thread 3 in accordance with the change of color during embroidery, the needle 13 is used by the upper thread supply device according to the first embodiment of the present invention. The process of adjusting the tension of the upper thread (3) to be supplied is as follows.

First, the extraction member driving unit 30 is driven such that the grip portion 27 of the extraction member 25 is positioned on the thread movement path of the separation unit 15 provided between the seal supply unit 5 and the seal guide 8. . At the same time, the rocking bracket 71 is rotated such that the thread catching portion 73 of the rocking bracket 71 is coaxial with the gripping portion 27 of the lead member 25. A process of hanging the upper thread 3 on the swinging bracket 71 will be described later.

Next, any one of the upper threads 3 selected from the plurality of upper threads of different colors waiting in the thread supply part 5 passes through the space supply part 6 of the thread supply part 5 via the thread supply path 6 by compressed air. Passing through the thread guide path (9) of the thread guide (8) is directed to the needle (13).

At this time, as shown in Figures 5a and 5b, the upper thread (3) exiting the thread supply path (6) through the gripping portion 27 of the lead member 25, the thread catching portion of the swing bracket (71) ( 73 is guided through the thread guide path 9 of the seal guide 8.

Subsequently, the drawing member 25 is rotated in one direction such that the upper thread 3 is partially wound on the thread contact portion 23 of the mounting force adjusting member 21.

That is, by driving the driving means not shown, the driving pin 45 is moved along the camp profile 43a of the driving cam 43 to rotate the driving cam 43 in one direction. As the driving cam 43 rotates, the driving shaft 33 is rotated so that 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. , The extraction member 25 is rotated in one direction.

As shown in FIGS. 6A and 6B as the drawing member 25 rotates, the upper thread 3 held by the holding part 27 of the drawing part 25 is removed from the thread movement path of the separation part 15. It is drawn out and wound along the thread contact portion 23 of the mounting force adjusting member 21. Here, it is preferable to rotate the drawing member 25 by only one rotation so that the upper thread 3 is wound around the thread contact portion 23 once.

Accordingly, the upper thread 3 wound around the thread contacting portion 23 of the mounting force adjusting member 21 generates resistance while passing through the thread contacting portion 23 of the mounting force adjusting body 21, and thus, along the thread contacting portion 23. Tension is generated in the upper thread 3 moving.

On the other hand, the upper thread (3) moving through the mounting force adjusting member 21 to the thread guide (8) is caught by the upper thread (3) to the thread catching portion (73) of the swing bracket (71), the cam elastic member ( The swinging bracket 71 returns to its original position by the elastic force of 95, and the returned swinging bracket 71 swings by the elastic force of the elastic member 91 for the swinging bracket. Thus, the upper thread 3 passing through the rocking bracket 71 is tensioned and relaxed by the rocking of the rocking bracket 71 as well as the tension of the upper thread 3 itself applied by the mounting force adjusting member 21.

Here, a process of hanging the upper thread 3 on the thread catching portion 73 of the swinging bracket 71 will be described.

As shown in FIG. 7A, the cam driving portion 87 is driven and moved so that the thread catching portion 73 of the swing bracket 71 which is mutually biased and the grip portion 27 of the extracting member 25 are coaxial. The pin 85 is moved along the camp profile 83a of the bracket driving cam 83. 8A and 8B, 9A and 9B, 10A and 10B, the bracket driving cam as the moving pin 85 moves up and down the camp profile 83a of the bracket driving cam 83. As the 83 is rotated, the rocking bracket 71 rotates, and as shown in FIG. 7B, the thread engaging portion 73 of the rocking bracket 71 is coaxial with the gripping portion 27 of the lead member 25. Communicate.

Accordingly, any one of the upper threads 3 selected from the plurality of upper threads of different colors waiting in the thread supply part 5 passes through the thread supply path 6 of the thread supply part 5 by compressed air, After being caught by the thread catching portion 73 of the rocking bracket 71 via the gripping portion 27, it is directed to the needle 13 via the thread guide path 9 of the thread guide 8.

Then, after the upper thread 3 is caught by the thread catching portion 73 of the rocking bracket 71, the thread catching portion 73 of the rocking bracket 71 and the gripping portion 27 of the lead member 25 are coaxial. When the cam driving unit 87 is driven so as not to achieve, the moving pin 85 is moved downward along the camp profile 83a of the bracket driving cam 83, and the swing bracket 71 is elastic for the cam as shown in FIG. 8A. The elastic force of the member 95 returns to its original position, oscillates in a predetermined section, and tensions and relaxes the upper thread 3.

On the other hand, Figure 11 is a partially enlarged perspective view of the upper thread supply apparatus for an automatic machine according to a second embodiment of the present invention, Figure 12 is an exploded perspective view of FIG. As shown in these figures, the upper thread feeding device 1 'for the automatic machine according to the second embodiment of the present invention is swinging to tension and relax the upper thread 3, unlike the first embodiment described above. The bracket 71 'is not coupled to the bush 75 of the lead member driving part 30, but is hinged to the auxiliary frame 51 coupled to the frame 19 in the vertical direction of the frame 19. It is rotatably coupled. The swing bracket 71 'swings in the up and down direction corresponding to the thread take-up 11, i.e., swings between the top dead center and the bottom dead center.

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

The tension plate 71b 'of the swinging bracket 71' is provided with a thread catching portion 73 'on which the upper thread 3 directed from the mounting force adjusting member 21 toward the needle 13 is engaged. In this embodiment, a through hole through which the thread penetrates is formed as the thread catching portion 73. In addition, the thread catching portion 73 'withdraws the upper thread 3 toward the needle 13 through the thread supply path 6 and the thread guide path 9 when the upper thread 3 is replaced, The thread take-out lever 7 penetrates as the thread draw-out portion to be attached to the tube.

Here, the thread take-out lever 7 is reciprocally installed in the lever receiving hole 10 formed in the seal guide 8 at a predetermined angle with the thread guide path 9.

In addition, unlike the first embodiment described above, the bracket driving unit 81 'according to the second embodiment of the present invention is a tension plate approaching and spaced apart from the pin coupling portion 71a' of the rocking bracket 71 '. The clutch 88 and the clutch drive part 89 which raise and lower the tension plate clutch 88 are provided.

In the present embodiment, a fluid pressure cylinder for reciprocating the tension plate clutch 88 by extending and contracting the length by the fluid pressure as the clutch driving part 89 is disclosed. In addition to the fluid pressure cylinder, a motor, a cam device, a solenoid or the like is used. It is also possible to drive the tension plate clutch 88.

In addition, one end of the swing bracket elastic member 91 'according to the second embodiment of the present invention is supported by the hinge pin 53, and the other end is supported by the swing bracket 71'. The rocking bracket elastic member 91 'provides an elastic force so that the rocking bracket 71' swings between a predetermined section, that is, a top dead center and a bottom dead center, and in the present embodiment, as the rocking bracket elastic member 91 '. A torsion spring is disclosed.

On the other hand, between the rocking bracket 71 'and the tension plate clutch 88 is coupled to the long hole (51a) of the auxiliary frame 51, the rocking bracket intermittent pin as a tension adjusting member for controlling the rocking degree of the rocking bracket 71' (97) is provided. The rocking bracket intermittent pin 97 is disposed adjacent to the pin coupling portion 71a 'of the rocking bracket 71'. Thus, as shown in FIGS. 14A and 14B, the rocking bracket intermittent pin 97 has a rocking bracket 71 'when the upper thread 3 caught in the thread catching portion 73' of the rocking bracket 71 'is tensioned. Spaced apart from the pin coupling portion 71a 'and the upper thread 3 caught in the thread catching portion 73' of the swing bracket 71 'is relaxed, the pin coupling portion 71a' of the swing bracket 71 '. ). On the other hand, by moving the rocking bracket intermittent pin 97 along the long hole 51a of the auxiliary frame 51, the bottom dead center position of the rocking bracket 71 'is adjusted, that is, the needle 13 via the thread take-up 11 It is possible to adjust the tension of the upper thread (3) toward.

By such a configuration, a process of adjusting the tension of the upper thread 3 supplied to the needle 13 by using the upper thread supply device 1 'according to the second embodiment of the present invention will be described below.

Prior to the description, the process of winding the upper thread 3 on the thread contacting portion 23 of the mounting force adjusting body 21 to adjust the tension of the upper thread 3 is the same as the first embodiment described above, so the description thereof is omitted. Hereinafter, a process of adjusting the tension of the upper thread 3 by hanging the upper thread 3 on the thread engaging portion 73 'of the swing bracket 71' will be described.

When the thread take-up machine 11 is located at the bottom dead center, the swing bracket 71 'is raised to raise the thread catching portion 73' of the swing bracket 71 'and the lever receiving hole 10 of the seal guide 8. The clutch tooth driving unit 89 is driven to communicate. Any one of the upper threads 3 selected from the plurality of upper threads of different colors waiting on the thread supply part 5 passes through the thread supply path 6 of the thread supply part 5 by compressed air and is a holding part of the lead member 25. After being caught by the thread catching portion 73 'of the rocking bracket 71', it is directed to the needle 13 via the thread guide path 9 of the thread guide 8. At this time, the upper thread (3) for moving the thread guide path (9) is gripped by the thread take-off lever (7) accommodated in the lever receiving hole (10) is directed to the needle (13).

Then, when the thread take-out lever 7 is driven forward to approach the thread take-up 11, the thread take-out lever 7 is the thread catching portion 73 'of the swing bracket 71'. The upper thread (3) is hooked to the thread take-up (11).

Next, when the upper thread 3 is caught by the thread take-up 11, the thread take-out lever 7 is driven backward so that the thread take-out lever 7 is spaced apart from the thread take-up 11, and the thread take-out lever 7 is a rocking bracket. It exits the thread catching part 73 'of 71' and is accommodated in the lever accommodation hole 10 of the seal guide 8. As shown in FIG.

Then, after the upper thread 3 is caught by the thread catching portion 73 'of the swinging bracket 71', the lever receiving hole of the thread catching portion 73 'and the thread guide 8 of the swinging bracket 71' ( When the clutch driving unit 89 is driven to lower the swing bracket 71 'so that 10) does not communicate, the swing bracket 71' is returned to its original position by the elastic force of the swing bracket elastic member 91 '. That is, the thread catching portion 73 is located at the top dead center of the swing bracket 71 '.

On the other hand, the upper thread (3) which passes through the thread tension adjusting body (21) and moves to the needle (13) through the thread guide (8) is gripped by the thread take-off lever (7) and the thread take-up (11) and rocking bracket (71) After being caught by the thread catching portion 73 ', tension and relaxation are caused by the swing of the thread take-up 11.

That is, as shown in Figs. 13A and 14A, when the thread take-up 11 is at the top dead center, the tension plate 71b 'of the swing bracket 71' is also at top dead center, so that the upper thread 3 is nervous. 13B and 14B, when the thread take-up 11 is at the bottom dead center, the tension plate 71b 'of the swing bracket 71' is also at the bottom dead center, so that the upper thread 3 is Relaxes.

Thus, the upper thread 3 passing through the rocking bracket 71 'is not only the tension of the upper thread 3 itself applied by the mounting force adjusting member 21 but also the mutual operation of the thread take-up 11 and the rocking bracket 71'. By tension and relaxation.

Particularly, in the upper thread supply device 1 'according to the second embodiment of the present invention, the swing bracket 71' is arranged closer to the needle 13 than the first embodiment described above to further increase the tension of the upper thread 3; It can be adjusted reliably.

As such, the upper thread is partially wound around the mounting tension regulator by rotating the withdrawing member that grips the upper thread at a position spaced apart from the rotation axis, and the resistance is generated while the upper thread passes through the mounting tension regulator, thereby easily tensioning the upper thread. It can adjust the work time and shorten the working time.

On the other hand, it is apparent to those skilled in the art that the spirit of the present invention is not limited to a single needle automatic machine but may be applied to a multi needle automatic machine.

As described above, according to the present invention, by improving the tension control structure of the upper thread, it is possible to easily adjust the tension of the upper thread, to provide an upper thread supply device for an automatic embroidery machine that can shorten the working time.

Claims (7)

In the upper thread supply apparatus for an automatic machine for supplying the upper thread from the thread supply unit to the needle work unit, A thread tension adjusting member which has a thread contact portion which the upper thread is at least partially wound and makes contact with the upper thread and gives resistance to the upper thread passing through the thread contact part to adjust the tension of the upper thread; A drawing member rotatably installed about a predetermined rotation axis, the drawing member being capable of winding the upper thread on the mounting force adjusting body by rotating while holding the upper thread at a position spaced apart from the rotation axis; And a drawing member driving unit for rotating the drawing member so that the upper thread is at least partly wound around the thread contacting part. The method of claim 1, The drawing member driving unit, A rotating shaft coupled to the drawing member and rotating; A drive shaft disposed to be spaced apart from the rotation shaft with a predetermined axis distance; A soccer eastern to rotate the drive shaft; And a power transmission unit provided between the rotating shaft and the driving shaft to transmit the rotational force of the driving shaft to the rotating shaft. The method of claim 1, A rocking bracket having a thread catching portion for catching the upper thread directed from the thread tension adjusting member to the needle work portion, the swinging bracket swinging to tension and relax the upper thread; A bracket driving unit which drives the rocking bracket to move the thread locking portion of the rocking bracket on a thread moving path so that the upper thread is caught by the thread locking portion; The upper thread supplying device for an automatic embroidery machine further comprises an elastic member for a rocking bracket for providing a predetermined elastic force to the rocking bracket so that the rocking bracket swings. The method of claim 3, The bracket drive unit, A bracket driving cam having a predetermined camp profile on the side; A moving pin moving along the camp profile of the bracket driving cam; The cam driving unit for rotating the bracket driving cam by moving the moving pin along the camp profile of the bracket driving cam, And said swing bracket elastic member has one end supported by the bracket driving cam and the other end supported by the swing bracket to swing the swing bracket. The method of claim 4, wherein The bracket driving unit further comprises a cam elastic member for rotating the bracket driving cam with a predetermined elastic force so that the bracket driving cam returns to its original position. The method of claim 3, A thread take-up which swings a predetermined section and relaxes and relaxes the upper thread, It further comprises a thread drawer for drawing the upper thread to the needle working portion from the thread tension adjusting body to hang the thread take-up and the thread catching portion, The swinging bracket is upper thread supply device for an automatic embroidery machine, characterized in that the swinging in the vertical direction corresponding to the thread take-up. The method of claim 6, The thread catching portion is located at the top dead center of the rocking bracket when the thread take-up is located at the top dead center, and the thread catching portion is located at the bottom dead center of the rocking bracket when the thread take-up is located at the bottom dead center. Upper thread feeder.

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