KR100639355B1 - Thread feeding apparatus for an automatic embroidering machine - Google Patents

Abstract

The present invention relates to an upper thread supplying device for an automatic machine, comprising: a thread supply unit for supplying any one of the upper threads selected from the plurality of upper threads having different colors; A pair of thread guides which form a thread guide path for guiding the upper thread supplied from the thread supply part, and are continuously installed with each other along a thread moving path of the thread guide path; A thread take-up unit having a thread hanger to which the upper thread is caught, oscillating between the top dead center and the bottom dead center, and tensioning and relaxing the upper thread; And a thread drawer having a thread drawer lever for gripping and pulling the upper thread passing through the separation part, and a thread drawer driver for reciprocating the thread drawer lever to hang the upper thread held on the thread drawer to the thread hanger. . As a result, the single thread can be prevented during the replacement of the upper thread, and the replacement work time can be shortened to improve work efficiency.

Description

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

1 is a partial side cross-sectional view showing a schematic configuration of an upper thread supplying device for an automatic machine according to a first embodiment of the present invention;

Figure 2 is a partially enlarged perspective view of the upper thread supply device for the automatic machine of Figure 1,

3 is an exploded perspective view of the main part of FIG. 2;

4 is a side view of FIG. 2;

5 is an exploded perspective view of the main parts of the thread holder of FIG. 2;

6a to 6c is a plan view showing the operation of the thread hook portion and the thread extraction lever,

Figure 7a to 7d is a side view showing the operation of the thread hook portion and the pull out lever,

8 is a partially enlarged perspective view illustrating a state in which a thread is caught in the thread hanger when the thread hanger is located at the bottom dead center;

9 is a partially enlarged perspective view illustrating a state in which a thread is caught in the thread hanger part when the thread hanger part is located at the top dead center;

10 is a partial side cross-sectional view showing a schematic configuration of an upper thread feeder for an automatic machine according to a second embodiment of the present invention;

11a to 11c is a plan view showing an operation process of the thread hanger and the thread take-off lever disassembled clamp of FIG.

12A to 12D are side views illustrating an operation process of the thread hook part and the thread extraction lever assembled with the clamp of FIG. 10.

       * Explanation of symbols for the main parts of the drawings

1,1 ': Upper thread feeder 3: Upper thread

5: seal supply section 10a, 10b: seal guide

11a, 11b: thread guide 15: spaced part

20: take up the thread 21: arm

25: thread hanger 27: opening part

31: flap 40: thread drawer

41,41 ': Real drawing lever 51: Real drawing drive part

55 bracket 61 flap receiving portion

65: elastic member 71: clamp

73: support portion 75: pressing portion

77: insertion part

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 a structure for providing the upper thread to a thread take-up 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 thread supply unit for supplying the upper thread of various different colors from a plurality of failures in the direction of embroidery work, and a plurality of needle work units selectively receiving the upper thread from the thread supply unit to selectively perform embroidery work. And a plurality of thread take-ups for tensioning and relaxing the upper thread connected to each needle working part. Each of the needle work parts includes a needle for embroidering by vertical reciprocating motion, and a presser foot for pressing the embroidery fabric along the direction of travel of the needle. Thus, such an automatic embroidery machine is provided with a plurality of needle working portions and a plurality of thread take-ups, and the structure thereof is complicated.

By improving the complex structure of the automatic embroidery machine, an automatic embroidery machine for a single needle having a single needle work bench has been developed, and the upper thread supplying device of the automatic embroidery machine for such a single needle is disclosed in Korean Utility Model Registration No. 20-167993. It is.

The upper thread supply apparatus of the conventional single needle automatic embroidery machine includes a vertical operating tube installed to receive the upper thread selected from the plurality of upper threads from the thread supply unit, a fixed tube receiving the upper thread from the vertical operating tube, and an end of the fixed tube. It is provided in the supply thread for injecting high-pressure air to transfer the upper thread to the needle work area, it is possible to automatically supply the upper thread corresponding to each color.

On the other hand, when the upper thread is replaced or single threaded in accordance with the color change during embroidery, the upper thread is replaced to the rear of the axis formed by the vertical operation tube and the fixed tube from the lower dead center of the thread take-up, that is, the thread travel path. After positioning backward, the vertical operation tube and the fixed tube are brought into close contact with each other to form a connecting pipe line, and then the upper thread is supplied to the connecting pipe line. Subsequently, the vertical actuating tube and the fixed tube are spaced apart by a predetermined interval, and then the thread hanger of the thread take-up is rotated to the front of the thread moving path by the gap between the vertical operating tube and the fixed tube and the upper thread is hooked to the thread hanger of the thread take-up. .

By the way, in the conventional upper thread supply apparatus for embroidery machines, the thread hook portion of the thread take-up during the upper thread replacement operation is located behind the thread movement path beyond the operating range between the top dead center and the bottom dead center, and then the thread hook part is Since the thread hanger part is moved from the rear toward the bottom dead center to catch the upper thread moving the thread move path while passing through the thread move path, when the upper thread is caught in the thread hanger part of the thread take-up, the upper thread is impacted and the yarn may be burnt. There is. In addition, there is a problem that the work efficiency is lowered because the replacement of the upper thread takes a long time by moving the thread hook portion of the thread taker to the rear of the thread movement path.

Accordingly, it is an object of the present invention to provide an upper thread supplying device for an automatic embroidery machine that can prevent single yarn during the replacement of the upper thread and improve the working efficiency by shortening the replacement work time.

In order to achieve the above object, the present invention, the thread supply unit for supplying any one of the upper thread selected from the plurality of upper thread having a different color in the upper thread supply device for an automatic embroidery machine; A pair of thread guides which form a thread guide path for guiding the upper thread supplied from the thread supply part, and are continuously installed with each other along a thread moving path of the thread guide path; A thread take-up unit which has a thread hanger to which the upper thread is caught, and swings and drives the upper thread by oscillating between a top dead center and a bottom dead center; And a thread drawer having a thread drawer lever for gripping and pulling the upper thread passing through the separation part, and a thread drawer driving unit for reciprocating the thread drawer lever to walk the upper thread held by the thread drawer lever to the thread hanger. It provides an upper thread supply device for an automatic embroidery machine.

Here, the thread take-out lever is linearly moved, rotated, or curved in a plane that forms a predetermined angle with a movement path of the upper thread passing through the spacer, and grips the upper thread passing through the spacer to the thread hanger part. I can walk.

On the other hand, the thread take-up arm and swinging between the top dead center and the bottom dead center; An annular threaded hook portion which forms an open portion and is provided in one region of the arm to which the upper thread is caught; And an arm driver for oscillating the arm.

In addition, the thread take-up may further include a flap rotatably coupled to the thread-hanging portion, to open and block the opening and to prevent the upper thread received from the opening.

The thread drawer may include: a bracket rotatably coupled to the thread draw lever to form a flap accommodating part for accommodating the flap together with the thread draw lever; It may further include an elastic member for rotating the bracket with a predetermined elastic force so that the flap accommodated in the flap accommodation portion is separated from the flap accommodation portion.

On the other hand, the thread take-up is elastically supported by the thread hanger portion, may further comprise a clamp made of an elastic material for opening and blocking the opening and preventing the separation of the upper thread received in the opening portion, the clamp, the clamp A support part supported by the thread hanger part; A pressurizing portion extending from the support portion to press the side of the thread-hanging portion so as not to be detached from the upper thread caught on the thread-hanging portion and blocking the opening; It may include an insertion portion bent from the one end of the pressing portion spaced apart from the side of the thread hanger portion, the thread extraction lever is inserted.

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 pair of thread guides 10a and 10b for guiding the upper thread 3 supplied from the thread supply part 5 with the needle 9, and the pair of thread guides 10a and 10b Thread for taking the upper thread (3) passing through the thread take-up (20) to relax and relax, and holding the upper thread (3) passing through a pair of thread guides (10a, 10b) and walks to the thread take-up (20) It includes a lead portion 40.

The thread supply unit 5 adjusts the tension of any one of the upper threads 3 selected from the plurality of upper threads having different colors in the air and supplies them to the pair of seal guides 10a and 10b by compressed air.

The pair of seal guides 10a and 10b are provided with thread guide paths 11a and 11b for guiding the upper thread 3 supplied from the thread supply part 5, and each seal guide 10a and 10b is a thread guide. Spacer portions 15 are formed along the yarn movement paths 11a and 11b. The pair of seal guides 10a and 10b in the present embodiment form a spaced portion 15 and consist of a single block having a rectangular cross-section formed integrally. Hereinafter, for convenience of explanation, the seal guide located on the upper side will be referred to as the upper seal guide 10a, and the seal guide located on the lower side will be referred to as the lower seal guide 10b. The upper seal guide 10a and the lower seal guide 10b form a spaced part 15 along the thread movement paths of the thread guide paths 11a and 11b, and are preferably coaxially installed with each other. Each thread guide path (11a, 11b) of the guide (10a) and the lower seal guide (10b) may be installed in a continuous eccentric with each other. Here, the upper seal guide (10a) and the lower seal guide (10b) is not made of a single block having a rectangular cross-sectional shape, it may be made of a pair of blocks to form the separation portion 15 by accessing and spaced apart from each other. . In addition, the upper seal guide (10a) and the lower seal guide (10b) has a variety of cross-sectional shape and a single tubular body formed with the spaced portion 15, or a pair of mutually adjacent and spaced to form the spaced portion 15 It may also consist of a tubular body.

Thread take-up 20 is the arm 21 swinging between the top dead center and the bottom dead center, and the opening portion 27 is formed in one region of the arm 21 is provided with a thread hanger 25 for the upper thread (3) is caught; Wow. And an arm driving unit (not shown) for oscillating and driving the arm 21.

The arm 21 oscillates between the top dead center and the bottom dead center formed in front of the real movement path by the driving of the arm driving unit. As the arm drive unit, a fluid pressure cylinder, a motor, a cam device, a solenoid or the like can be applied.

The thread hook portion 25 is provided at the free end of the arm 21 and swings between the top dead center and the bottom dead center together with the arm 21. As shown in FIG. 5, the thread hook portion 25 forms an open portion 27 having one side opened to catch the upper thread 3. Here, the thread hanger 25 may have an annular shape or may be provided at one side portion of the arm 21.

On the other hand, the thread take-up 20 of the upper thread supply device 1 for the automatic machine according to the first embodiment of the present invention prevents the detachment of the upper thread 3 accommodated in the opening 27 of the thread hanger 25 It further has a flap 31. The flap 31 is provided adjacent to the opening of the opening 27 to open and close the opening 27, and is rotatably coupled to the thread holder 25. One side of the flap 31 is elastically supported by the thread holder 25 by the flap elastic member 35. The flap elastic member 35 provides an elastic force so that the flap 31 blocks the opening 27. In this embodiment, the coil spring is disclosed as the flap elastic member 35, but in addition to the coil spring, the leaf spring is provided. Or spiral springs may be applied. In addition, the flap 31 is rotated by the flap elastic member 35 so that when the opening 27 is blocked, the free end of the flap 31 is provided on the stopper 29 provided in the opening area of the thread hanger 25. The jam is held and no longer rotates.

Thus, the flap 31 rotates in the opening 27 and opens and blocks the opening 27. The flap 31 opens the open portion 27 by pressing the thread take-out lever 41 to be described later, blocks the open portion 27 by the flap elastic member 35, and opens the open portion 27. The separation of the upper thread (3) received in the prevent.

Here, the flap 31 may be optionally interposed.

The thread take-out part 40 includes a thread draw lever 41 for holding and pulling the upper thread 3 passing through the separation part 15, and a thread draw driver 51 for reciprocating the thread draw lever 41. do.

The thread drawing lever 41 is provided to be linearly movable along a plane that forms a predetermined angle with the movement path of the upper thread 3 passing through the separation part 15. The thread drawing lever 41 extends at a predetermined distance from one side of the driving connecting portion 43 and the driving connecting portion 51 at a predetermined distance so as to linearly move in the spaced part 15. It has a pair of grip ends 45a and 45b. In the following description, the grip end facing the upper seal guide 10a is referred to as the lower grip end 45b for the upper grip end 45a and the lower seal guide 10b. The upper grip end 45a and the lower grip end 45b together with the bracket 55 to be described later form a flap accommodating portion 61 in which the flap 31 is accommodated. Through-holes 47a and 47b through which the upper thread 3 passes through the upper holding end 45a and the lower holding end 45b respectively hold the upper thread 3 passing through the separation part 15. Formed.

Accordingly, the thread take-off lever 41 passes linearly toward the thread hanger 25 located in the bottom dead center region in a plane that forms a predetermined angle with the thread movement path of the spacer 15. Hold the upper thread (3) to hang on the hanger (25). Here, the thread drawing lever 41 rotates along a plane that forms a predetermined angle with the movement path of the upper thread 3 passing through the spacer 15, and grips the upper thread 3 passing through the spacer 15. You can also hang on the thread holder (25). In addition, the thread take-out lever 41 curves in a plane having a predetermined radius of curvature with respect to the movement path of the upper thread 3 passing through the spacer 15, and the upper thread 3 passing through the spacer 15. ) Can be hooked to the hanger (25).

Here, although not shown, instead of the through holes 47a and 47b as the grip portions, one side is opened at the free ends of the grip ends 45a and 45b to form a semi-circular arc-shaped grip groove to fill the space, The upper thread 3 passing through 15 may be gripped and drawn out to the thread hanger 25 of the thread take-up 20. In addition, the gripping end may be configured as a single unit, and the upper thread 3 passing through the separation unit 15 may be gripped and drawn out to the thread hanger 25.

Thread take-out driving part 51 is connected to the drive connecting portion 43 of the thread take-out lever 41, the take-up 20 of the upper thread (3) passing through the spaced portion 15 held by the thread take-out lever 41 The thread take-out lever 41 is reciprocated so as to hang on the thread hanger 25. In the present embodiment, a fluid pressure cylinder for reciprocally moving the thread draw lever 41 by extending and contracting the length by the fluid pressure as the thread draw-out driving part 51 is disclosed. In addition to the fluid pressure cylinder, a motor, a cam device, a solenoid, etc. may be used. The actual drawing lever 41 can also be driven.

On the other hand, the plate-shaped bracket 55 is rotatably coupled by a pin 59 on one side of the drive connecting portion 43 of the thread draw lever 41. The bracket 55 presses the flap 31 together with the thread extraction lever 41 to open the opening 27 of the thread take-up 20 to receive the upper thread 3 in the opening 27. A profile portion 57 having a predetermined shape is provided on the plate surface of the bracket 55 positioned in the pair of grip end portions 45a and 45b of the thread extraction lever 41, and the profile portion 57 has a flap. 31 is in sliding contact. The profile portion 57 is formed in parallel with the linear movement direction of the grip ends 45a and 45b to linearly move the flap 31 accommodated in the flap accommodation portion 61, and the linear movement portion ( 57a) has a horizontal moving part 57b formed horizontally with a predetermined inclination with respect to the linear movement direction of the holding | gripping ends 45a and 45b. In addition, one side of the bracket 55 is elastically supported by the elastic member 65, the elastic member 65 is elastically urged so that the bracket 55 presses the flap 31 accommodated in the flap accommodating portion (61) In this embodiment, the leaf spring is disclosed as the elastic member 65, but in addition to the leaf spring, a coil spring, a spiral spring, or the like may be applied.

Thus, the thread takeout lever 41 and the bracket 55 are approached toward the thread hanger 25 of the thread take-up 20 to receive the upper thread 3 at the opening 27 of the thread take-up 20. When the flap 31 is returned to its original position by driving the pull-out drive part 51 while the flap 31 is accommodated in the flap accommodating part 61, the flap 31 is returned to its original position. The flap 31 is linearly slid along the linear movement portion 57a of the profile portion 57 of the bracket 55 after the opening portion 27 is blocked, and then the horizontal movement portion 57b of the profile portion 57 is moved. Sliding movement along the free end of the bracket 55 is gradually rotated away from the thread take-off lever 41 so that the flap receiving portion 61 is opened, the flap 31 is the flap receiving portion of the thread take-out portion 40 Departure from (61). On the other hand, as soon as the flap 31 is released from the flap accommodating portion 61 of the thread extracting portion 40, the bracket 55 rotates to the side of the thread extracting lever 41 by the elastic force of the elastic member 65, thereby preventing the original flap 31 from being displaced. Restored to position.

Here, the bracket 55 and the elastic member 65 may be selectively interposed.

By this configuration, by using the upper thread supply device 1 according to the first embodiment of the present invention, the upper thread is replaced or threaded in accordance with the change of color during embroidery, the upper thread is replaced in the take-up machine 20 during the replacement operation The process of hanging the upper thread (3) is as follows.

First, the arm drive unit is driven to position the thread hanger 25 of the thread take-up 20 at the bottom dead center as shown in FIG. 4, and then stops the arm drive unit.

At this time, between the upper seal guide 10a and the lower seal guide 10b, that is, the separation part 15, each grip end 45a, 45b of the thread take-off lever 41 is positioned, and each seal guide 10a, The thread guide paths 11a and 11b of 10b) and the threaded through holes 47a and 47b of the respective grip ends 45a and 45b are coaxial.

Then, any one of the upper threads 3 selected from the plurality of upper threads of different colors waiting in the thread supply part 5 is supplied to the thread guide paths 11a and 11b of the respective thread guides 10a and 10b by compressed air. . At this time, the upper thread 3 to be replaced passes through the thread guide path 11a of the upper thread guide 10a, and through-holes 47a and 47b of the respective grip ends 45a and 45b of the thread extraction lever 41 are provided. Passed sequentially through the thread guide path (11b) of the lower thread guide (10b) to the needle (9).

Next, as shown in FIG. 6A, the thread withdrawal lever 41 holding the upper thread 3 through the through holes 47a and 47b of the respective grip ends 45a and 45b is located at the bottom dead center. The thread take-out driving part 51 is driven forward to approach the thread hanger 25 of the take-up 20.

The thread take-off lever 41 presses the flap 31 of the thread take-up 20 together with the bracket 55 by the forward drive of the thread draw-out driving part 51, and as shown in FIG. 6B, the thread hanger 25 The flap 31 which cut off the opening part 27 of () is rotated inside the opening part 27, and the opening part 27 is opened.

The upper thread 3 gripped by the thread passing holes 47a and 47b of the thread takeout lever 41 is positioned in the opening 27 as shown in FIG. 7A, and is subsequently moved forward of the thread drawout drive 51. When the upper thread 3 reaches a predetermined position in the opening portion 27 by driving, the flap 31 blocks the original position, that is, the opening portion 27 by the elastic force of the elastic member for flaps 35. Return to the position.

At this time, the flap 31 is accommodated in the flap receiving portion 61 formed by the thread draw lever 41 and the bracket 55, and the flap 31 also contacts the profile portion 57 of the bracket 55. .

Subsequently, the thread take-out lever 41 is driven backward so that the thread take-out lever 41 is spaced apart from the thread hanger portion 25 of the failing machine.

The flap 31 is linearly slid along the linear movement portion 57a of the profile portion 57 of the bracket 55 in a state where the flap 31 is blocked by the backward drive of the thread draw-out driving portion 51. The transverse portion 57b of the profile portion 57 is reached, and the sliding portion is then slid along the transverse portion 57b as shown in FIG. 7B so that the free end of the bracket 55 is gradually removed from the thread extraction lever 41. The flap receptacle 61 is opened as shown in FIG. 7C while being spaced apart, so that the flap 31 is displaced from the flap receptacle 61 of the thread lead-out part 40.

As soon as the flap 31 is out of the flap accommodating portion 61 of the thread lead-out part 40, the bracket 55 is moved by the elastic force of the elastic member 65 as shown in FIG. 7D. Rotate laterally to restore the original position.

Subsequently, the thread movement paths of the seal guides 10a and 10b and the through-holes 47a and 47b of the respective grip ends 45a and 45b are coaxial with each other by the reverse driving of the thread take-out driving part 51. As shown in FIG. 8, the thread take-out lever 41 returns to the original position of the spacer 15, and the upper thread replacing operation of the upper thread replacing apparatus 1 of the automatic machine according to the present invention is completed.

At this time, as shown in Fig. 6c, the upper thread 3 passes through the thread guide path 11a of the upper thread guide 10a and passes through the thread through hole 47a of the upper gripping end 45a. After changing the direction, it passes through the through hole 47b of the lower gripping end 45b and is directed to the needle 9 through the thread guide path 11b of the lower seal guide 10b.

Subsequently, as shown in FIG. 9, when the thread hook portion 25 of the thread take-up 20 is positioned at the top dead center by driving the arm driving portion, the upper thread 3 caught on the thread hook portion 25 is tense, and thus The upper thread 3 caught by the thread hanger 25 by the swinging arm arm swings between the bottom dead center and the top dead center, and is tensioned and relaxed.

On the other hand, Figure 10 is a partial side cross-sectional view showing a schematic configuration of the upper thread supply apparatus for an automatic machine according to the second embodiment of the present invention. Unlike the first embodiment described above, the upper thread feeding device 1 'for the automatic embroidery machine according to the second embodiment of the present invention has a through hole 47a at the upper grip end 45a of the thread take-out lever 41'. ) Is formed, and a semi-circular arc-shaped gripping groove 47c having one side opened at the lower gripping end 45b. Here, the grip groove 47c of the lower grip end 45b serves to align the upper thread 3 when the upper thread 3 hangs on the thread hook portion 25 of the thread take-up 20. do.

In addition, the hook-shaped thread hook portion 25 of the thread take-up 20 is provided with a thread catching groove 25a in which the upper thread 3 is caught and the direction is changed.

And, the thread take-up 20 is elastically supported on one side of the thread hanger 25, opening and blocking the opening 27 of the thread hanger 25, the upper thread (3) received in the opening 27 Clamp 71 is made of an elastic material to prevent the separation of).

The clamp has a support part 73 supported on one side of the thread hanger 25, and a thread hanger 25 so that the upper thread 3, which is extended in length from the support part 73 and caught on the thread hanger 25, does not escape. Pressurizing section 75 for pressing the side of the pressing and blocking the opening 27, and bent extending from the distal end of the pressing section 75 to be spaced apart from the side of the thread hanger 25, thread take-out lever 41 ' Has an insertion portion 77 into which the lower gripping end 45b is inserted.

The pressing portion 75 in this embodiment has a half-wave wave shape extending from one end of the supporting portion 73, and the tip portion of the pressing portion 75 presses the side surface of the thread hook portion 25.

Here, it is preferable that the clamp 71 consists of a leaf spring.

By such a configuration, a process of hanging the upper thread 3 on the thread take-up 20 using the upper thread supply device 1 'according to the second embodiment of the present invention will be described.

First, the arm driving unit is driven to position the thread hanger 25 of the thread take-up 20 at the bottom dead center, and then the arm driving unit is stopped.

Then, any one of the upper threads 3 selected from the plurality of upper threads of different colors waiting in the thread supply part 5 is supplied to the thread guide paths 11a and 11b of the respective thread guides 10a and 10b by compressed air. . At this time, the upper thread (3) passes through the thread guide path (11a) of the upper thread guide (10a) through the thread through hole (47a) and the lower grip end (45a) of the upper grip end (45a) of the thread extraction lever 41 ' It passes through the gripping groove (47c (see Fig. 12a) of 45b) sequentially through the thread guide path (11b) of the lower thread guide (10b) toward the needle (9).

Next, as shown in FIGS. 11A and 12A, the thread take-off lever 41 ′ holding the upper thread 3 approaches the thread hanger portion 25 of the thread take-up unit 20 located at the bottom dead center. The eastern part 51 is driven forward. On the other hand, Figure 12a is a partial perspective view of the threaded out lever to aid in understanding the shape of each grip end 45a, 45b of the threaded out lever 41 'according to the second embodiment of the present invention It is shown next to.

The lower gripping end 45b of the thread take-out lever 41 'is inserted into the insertion portion 77 of the clamp 71 of the thread take-up 20 by the forward drive of the thread take-out driving part 51, and FIGS. 11B and FIG. As shown in 12b, the pressing portion 75 of the clamp 71, which has blocked the opening 27 of the threading portion 25, is spaced apart from the side surface of the threading portion 25 to press the pressing portion 75. Presses the side of the thread holder 25 to release the opening 27. At this time, the thread hanger 25 of the thread take-up 20 is positioned between the pair of grip ends 45a and 45b.

Subsequently, the upper thread 3 gripped by the thread through hole 47a of the thread takeout lever 41 'by the forward drive of the thread drawout drive part 51 is positioned in the opening part 27.

Subsequently, when the upper thread 3 reaches a predetermined position in the opening 27, that is, when the upper thread 3 reaches a position spaced apart from the pressing position of the clamping portion of the clamp, the thread take-out lever 41 ' The thread take-out driving part 51 is driven backward so as to be spaced apart from the thread hanger part 25 of (20).

As the thread take-out driving part 51 drives backward, the lower grip end 45b of the thread take-out lever 41 'leaves the pressing part 75 and the insertion part 77 of the clamp 71, and the lower grip end As soon as 45b is out of the pressing part 75, the pressing part 75 presses the side surface of the thread hanger part 25 by a predetermined elastic force, and blocks the opening part 27 of the thread hanger part 25, Restore to original position. At this time, the upper thread (3) passing through the through hole 47a of the upper grip end (45a) is caught in the thread catching groove (25a) of the thread hook portion 25, the upper thread (hung on the thread catching groove (25a) 3) the moving part of the upper thread 3 is switched by the pressing part 75 of the clamp 71 without deviating from the opening part 27 of the thread holder part 25.

Subsequently, by the reverse drive of the thread take-out driving part 51, the thread take-out lever 41 'is connected to the thread passages of the seal guides 10a and 10b and the through hole 47a and the lower side of the upper grip end 45a. The gripping groove 47c of the gripping end 45b returns to the original position of the spacer 15 so that the gripping groove 47c is coaxial, and the upper thread replacing operation of the upper thread replacing device 1 'of the automatic machine according to the present invention is completed. .

At this time, the upper thread (3) passes through the thread guide path (11a) of the upper thread guide (10a) through the thread through hole (47a) of the upper gripping end (45a) of the thread catching groove (25) 25a), and after changing the direction, it passes through the gripping groove 47c of the lower gripping end 45b and is directed to the needle 9 through the thread guide path 11b of the lower thread guide 10b.

As such, the upper thread passing through the separation part between the pair of thread guides guiding the upper thread supplied from the thread supply part is gripped and hooked to the thread hanger of the thread take-up located at the bottom dead center, so When weaving the upper thread on the upper thread, excessive force is not applied to the upper thread to prevent single yarn. In addition, since the replacement of the upper thread is made in the operating section of the thread hook portion of the thread take-up, the replacement time of the upper thread can be shortened to improve the work efficiency.

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 structure for providing the upper thread to the take-up, to prevent single thread during the replacement of the upper thread, the upper thread supply device for the automatic embroidery machine can improve the work efficiency by reducing the replacement work time To provide.

Claims (7)

In the upper thread feeder for an automatic embroidery machine, A thread supply unit for supplying any one of the upper threads selected from the plurality of upper threads having different colors; A pair of thread guides which form a thread guide path for guiding the upper thread supplied from the thread supply part, and are continuously installed with each other along a thread moving path of the thread guide path; A thread take-up unit which has a thread hanger to which the upper thread is caught, and swings and drives the upper thread by oscillating between a top dead center and a bottom dead center; And a thread drawer having a thread drawer lever for gripping and pulling the upper thread passing through the separation part, and a thread drawer driving unit for reciprocating the thread drawer lever to walk the upper thread held by the thread drawer lever to the thread hanger. Upper thread supply device for an automatic machine. The method of claim 1, The thread take-out lever moves in a plane that forms a predetermined angle with a movement path of the upper thread passing through the separation unit, and grips the upper thread passing through the separation unit, and hangs on the thread hanger unit. Upper thread feeder. The method of claim 2, The thread take-up, An arm swinging between the top dead center and the bottom dead center; An annular threaded hook portion which forms an open portion and is provided in one region of the arm to which the upper thread is caught; Upper thread supply device for an automatic machine, characterized in that it comprises an arm drive for swinging the arm. The method of claim 3, The thread take-up unit is rotatably coupled to the thread hanger, the upper thread supply device for an automatic machine, characterized in that it further comprises a flap for opening and blocking the opening and preventing separation of the upper thread received in the opening. The method of claim 4, wherein The thread drawer, A bracket rotatably coupled to the thread draw lever to form a flap accommodation portion for receiving the flap together with the thread draw lever; And an elastic member for rotating the bracket with a predetermined elastic force such that the flap accommodated in the flap accommodating part is separated from the flap accommodating part. The method of claim 3, The thread take-up device is elastically supported by the thread hanger, the upper thread supply device for an automatic machine, characterized in that it further comprises a clamp made of an elastic material for opening and blocking the opening and preventing the separation of the upper thread received in the opening portion. . The method of claim 6, The clamp is, A support part supported by the thread hanger part; A pressurizing portion extending from the support portion to press the side of the thread-hanging portion so as not to be detached from the upper thread caught on the thread-hanging portion and blocking the opening; The upper thread supply device for an automatic machine according to claim 1, further comprising an insertion part which is bent from one end of the pressing part so as to be spaced apart from the side of the thread hanger part, and the thread extracting lever is inserted therein.

Images