Embroidery machine thread trimming device and method for trimming thread ends of bottom threads

Abstract

The embroidery machine thread trimming device comprises a rotating shuttle box provided with a rotating shuttle, the rotating shuttle box is provided with a first thread trimming device and a second thread trimming device on the two sides of the rotating shuttle respectively, the first thread trimming device shears a bottom thread and an upper thread output by the rotating shuttle, the bottom thread is matched with the upper thread connected with an embroidery needle, and the second thread trimming device shears the bottom thread and the upper thread output by the rotating shuttle. And the second trimming device is used for trimming the upper thread exposed out of the reverse side part of the fabric after the first trimming device is trimmed. Bottom threads and upper threads output by the rotating shuttle are sheared through the first thread shearing device, the bottom threads are matched with the upper threads connected with the embroidery needle, that is, the bottom threads are sheared off after embroidery is completed to form fabric reverse thread ends, and the embroidery needle can embroider a next pattern conveniently; and the second trimming device trims the upper thread ends which are brought into the lower surface of the fabric and are not knotted to form stitches during needle raising after the first trimming device finishes trimming, so that the problem that the lengths of the thread ends on the reverse side of the fabric are consistent during needle raising after the reverse side of the fabric is trimmed is solved.

Description

Technical Field

[0001] The invention relates to the technical field of embroidery machine bottom thread trimming, and in particular to an embroidery machine bottom thread trimming device and a bottom thread trimming method for trimming the back thread ends of fabric to have a uniform length. Background Art

[0002] In an embroidery machine, the relationship between the upper thread connected by the embroidery needle and the lower thread in the rotary shuttle is a very critical part of the embroidery process. The upper thread is the thread located above the fabric during embroidery, while the rotary shuttle is responsible for forming the lower thread under the fabric. The coordination between the two directly affects the quality and effect of embroidery.

[0003] The relationship between the upper thread and the bottom thread in the hook:

[0004] Line tension adjustment:

[0005] The tension of the upper and lower threads needs to be adjusted precisely. If the upper thread tension is too high, the lower thread may be pulled up, resulting in a "floating lower thread" phenomenon; if the upper thread tension is too low, the lower thread may be too tight, resulting in the upper thread not being fully tightened, resulting in a "loose thread" phenomenon.

[0006] The tension of the bottom thread also needs to be properly adjusted and well interwoven with the top thread.

[0007] Stitch formation:

[0008] The upper and lower thread stitches need to be evenly interwoven on the front and back of the fabric. The upper thread passes through the fabric through the needle hole, and the shuttle rotates under the fabric, interweaving the lower thread with the upper thread to form a strong stitch.

[0009] After the embroidery machine completes the embroidery, it usually needs to use a shearing device to trim the thread ends. However, these devices are often complex in structure and cumbersome to operate. There are also problems such as incomplete thread trimming and the thread ends remaining too long or too short. Because the length of the surface thread varies according to the fabric of the embroidery, it is normally within 1 cm, but in most cases it is usually uneven over 2 cm, which causes great trouble for the user in the subsequent process. Therefore, the present invention proposes an embroidery machine thread trimming device and thread trimming method for trimming the bottom surface thread ends, aiming to improve the uniformity of the length of the thread ends on the back of the fabric. Summary of the invention

[0010] The invention provides an embroidery machine thread trimming device and a thread trimming method for trimming thread ends on the back side of fabric, which are used to improve the consistency of the length of thread ends on the back side of fabric embroidered by the embroidery machine and adjust the length, so as to achieve the technical standard of zero thread end length.

[0011] An embroidery machine thread trimming device for trimming the thread ends of bottom and top threads comprises a hook box equipped with a hook, wherein the hook box is respectively equipped with a first thread trimming device and a second thread trimming device on both sides of the hook, wherein the first thread trimming device trims the bottom thread and top thread of the completed stitch, wherein the bottom thread cooperates with the top thread connected with the embroidery needle, and the second thread trimming device trims the top thread ends on the reverse side of the fabric when the needle is started after the first thread trimming device trims the bottom thread and top thread of the completed stitch. The embroidery machine thread trimming device trims the bottom thread and top thread of the completed stitch through the first thread trimming device, and the bottom thread needs to be cut after the embroidery is completed in the state of the bottom thread cooperating with the top thread connected with the embroidery needle, so as to facilitate the embroidery of the next pattern with the embroidery needle, and the second thread trimming device of the present invention trims the top thread ends on the reverse side of the fabric when the needle is started, and adjusts the starting length of the bottom thread of the next pattern in the process of cooperating with the top thread, that is, no matter the fabric has problems such as poor synchronization between the top thread and the bottom thread, floating thread, loose thread, etc., there will be no problem of inconsistent length of the bottom thread ends, and they will be cut by the second thread trimming device to form the same length as the bottom thread ends cut by the first thread trimming device. The consistent length of the bottom thread can greatly improve the appearance and comfort of the back of the fabric.

[0012] The first wire trimming device includes a first pull rod, which is connected to a first connecting rod through a first clamping block, the first connecting rod is connected to a first movable knife driving rod, the first movable knife driving rod is connected to the first movable knife, and the first movable knife cooperates with the first fixed blade to perform a shearing operation.

[0013] The second wire cutting device includes a second pull rod, which is connected to a second connecting rod through a second clamping block, and the second connecting rod is connected to a second movable knife driving rod, and the second movable knife driving rod is connected to the second movable knife, and the second movable knife cooperates with the second fixed blade to perform a shearing operation.

[0014] The first pull rod is vertically connected to the first clamping block, the first clamping block drives the first connecting rod to rotate, the first connecting rod is rotatably connected to the first movable knife driving rod through the third connecting rod, the first clamping block and the first movable knife driving rod are parallel to each other, this driving structure moves horizontally back and forth through the first pull rod, the first pull rod is vertically connected to the first clamping block, the first clamping block drives the first connecting rod to rotate to form a rotational driving force for the vertically arranged first movable knife driving rod, which is more stable than the traditional motor connecting rod swinging drive.

[0015] The second pull rod is vertically connected to the second clamping block, the second clamping block drives the second connecting rod to rotate, the second connecting rod is rotatably connected to the second movable knife driving rod through the fourth connecting rod, and the second clamping block and the second movable knife driving rod are parallel to each other. This driving structure is more stable than the traditional motor connecting rod swing drive because the second pull rod moves horizontally back and forth, the second pull rod is vertically connected to the second clamping block, and the second clamping block drives the second connecting rod to rotate to form a rotational driving force for the vertically arranged second movable knife driving rod.

[0016] A spring pressure piece is provided on the upper side of the first fixed blade, which is pressed against the first fixed blade. The spring pressure piece enables the first fixed blade and the first movable blade to have a certain vertical shearing pressure during the shearing process, thereby improving the shearing effect and extending the service life of the first movable blade.

[0017] The first pull rod and the second pull rod are parallel to each other, and the two pull rods are connected by a double-hole sleeve, and the double-hole sleeve is provided with an integral positioning rod, and the positioning rod is fixedly connected to the rotary hook box. The first pull rod and the second pull rod are parallel to each other, which further ensures the high-speed synchronization and consistency of the first thread trimming device and the second thread trimming device during the cutting process, so as to match the high-frequency thread trimming performance required by the embroidery needle for high-speed embroidery and reduce the failure rate.

[0018] The rotary hook box is provided with an integrated first mounting arm and a second mounting arm on both sides of the rotary hook, the first mounting arm is fixedly connected to the first mounting plate, the first mounting plate is crimped with the first positioning block and the first fixed blade, the first mounting plate is connected to the first movable knife driving rod through the first mounting hole, the second mounting arm is fixedly connected to the second mounting plate, the second mounting plate is crimped with the second positioning block and the second fixed blade, and the second mounting plate is connected to the second movable knife driving rod through the second mounting hole. This mounting structure improves the stability of the positions of the first fixed blade and the second fixed blade, and avoids the problem of loose displacement after long-term work.

[0019] The first positioning block has a first positioning surface on its side that matches the first movable knife, and the second positioning block has a second positioning surface on its side that matches the second movable knife. The first positioning surface and the second positioning surface both improve the positioning accuracy of the first movable knife and the second movable knife during the reciprocating shearing process, reducing the cumulative error.

[0020] An embroidery machine thread trimming method for trimming the thread ends on the reverse side of a fabric comprises the following steps

[0021] Step 1: After the embroidery needle of the embroidery machine completes the embroidery, the first pull rod of the first thread cutting device drives the first fixed blade to rotate and cooperate with the first movable knife to cut the bottom line output by the rotary shuttle. The bottom line cooperates with the surface line connected by the embroidery needle, and after cutting, it is embroidered again to form a part of the thread ends on the reverse side of the fabric;

[0022] Step 2: After completing step 1, the second pull rod of the second thread trimming device drives the second fixed blade to rotate and cooperates with the second movable knife to control the needle to hook the upper thread end to the spring sheet and pause so that the upper thread end is pressed by the spring sheet. After the needle is controlled to complete 2-3 stitches, the second movable knife merges to cut the pressed upper thread. At this time, the length of this part of the upper thread end is from the blade of the second fixed knife to the center of the needle plate hole, and the action is completed.

[0023] The present invention completes the bottom surface thread of the stitch by the first thread trimming device, and the bottom line cooperates with the surface thread connected with the embroidery needle, that is, after the embroidery is completed, the bottom surface thread is cut off and the second embroidery forms the back surface thread end of the fabric, which is convenient for the embroidery needle to embroider the next flower pattern, and the second thread trimming device cuts the back surface thread end of the fabric after the first thread trimming device completes the second embroidery, and the length of the starting yarn thread end for embroidering the next flower pattern with the embroidery needle is consistent with the length of the bottom line thread end on the back surface of the fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings:

[0025] Figure 1 It is a three-dimensional structural schematic diagram of an embroidery machine thread trimming device for trimming the bottom thread ends of the present invention;

[0026] Figure 2 It is a three-dimensional structural schematic diagram of another angle of an embroidery machine thread trimming device for trimming the bottom thread ends of the present invention;

[0027] Figure 3 It is a schematic diagram of the installation structure of the first thread trimming device and the second thread trimming device in the present invention;

[0028] Figure 4 It is a schematic diagram of the installation structure of the first thread trimming device and the second thread trimming device in the present invention from another angle;

[0029] Figure 5 It is a schematic diagram of the installation structure of the first movable blade and the first fixed blade in the present invention;

[0030] Figure 6 It is a schematic diagram of the installation structure of the second movable blade and the second fixed blade in the present invention. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-6 The specific implementation method further describes the technical solution of this patent in detail. An embroidery machine thread trimming device for trimming the thread ends of the bottom and top threads includes a hook box 1 equipped with a hook 36, and the hook box 1 is respectively equipped with a first thread trimming device and a second thread trimming device on both sides of the hook 36. The first thread trimming device trims the bottom thread and top thread of the completed stitch, and the bottom thread cooperates with the top thread connected with the embroidery needle at this time, and the second thread trimming device trims the top thread ends on the reverse side of the fabric when the needle is started after the first thread trimming device trims, ensuring the consistency of the length of all thread ends on the back side of the fabric.

[0032] As a preferred structure, the first wire cutting device includes a first pull rod 8, which is connected to the first connecting rod 27 through the first clamping block 10, and the first connecting rod 27 is connected to the first movable knife driving rod 24, and the first movable knife driving rod 24 is connected to the first movable knife 21, and the first movable knife 21 cooperates with the first fixed blade 19. A spring pressing piece 4 is provided on the upper side of the first fixed blade 19, and the spring pressing piece 4 presses the first fixed blade 19. Of course, the spring pressing piece 4 presses the first movable knife 21 during the shearing process to improve the shearing performance. The second wire cutting device includes a second pull rod 7, and the second pull rod 7 is connected to the second connecting rod 12 through the second clamping block 11, and the second connecting rod 12 is connected to the second movable knife driving rod 15, and the second movable knife driving rod 15 is connected to the second movable knife 5, and the second movable knife 5 cooperates with the second fixed blade 18.

[0033] In order to further improve the shearing stability of the first thread trimming device, the first pull rod 8 is vertically connected to the first clamping block 10, the first clamping block 10 drives the first connecting rod 27 to rotate, the first connecting rod 27 is rotatably connected to the first movable knife driving rod 24 through the third connecting rod 25, and the first clamping block 10 is parallel to the first movable knife driving rod 24. The first pull rod 8 and the second pull rod 7 are parallel to each other, and the two pull rods are connected by a double-hole sleeve 9, and the double-hole sleeve 9 is provided with an integral positioning rod 14, and the positioning rod 14 is fixedly connected to the hook box 1, and the high-frequency synchronization of the first thread trimming device and the second thread trimming device is improved by the reciprocating motion of the first pull rod 8 and the second pull rod 7 in parallel to each other.

[0034] In order to further improve the shearing stability of the second wire cutting device, the second pull rod 7 is vertically connected to the second clamping block 11, the second clamping block 11 drives the second connecting rod 12 to rotate, and the second connecting rod 12 is rotatably connected to the second movable knife driving rod 15 through the fourth connecting rod 13. The second clamping block 11 and the second movable knife driving rod 15 are parallel to each other.

[0035] As a structural priority, the hook box 1 is provided with an integrated first mounting arm 2 and a second mounting arm 6 on both sides of the hook 36, the first mounting arm 2 is fixedly connected to the first mounting plate 23, the first mounting plate 23 is crimped with the first positioning block 28 and the first fixed blade 19, the first mounting plate 23 is connected to the first movable knife driving rod 24 through the first mounting hole, the second mounting arm 6 is fixedly connected to the second mounting plate 26, the second mounting plate 26 is crimped with the second positioning block 16 and the second fixed blade 18, and the second mounting plate 26 is connected to the second movable knife driving rod 15 through the second mounting hole. The first positioning block 28 is provided with a first positioning surface that matches the first movable knife 21 on the side, and the second positioning block 16 is provided with a second positioning surface that matches the second movable knife 5 on the side.

[0036] An embroidery machine thread trimming method for trimming the thread ends on the reverse side of a fabric comprises the following steps

[0037] Step 1: After the embroidery needle of the embroidery machine completes embroidery, the first pull rod (8) of the first thread cutting device drives the first fixed blade (19) to rotate and cooperate with the first movable knife (21) to cut the bottom line output by the rotary shuttle. The bottom line cooperates with the surface thread connected by the embroidery needle, and after cutting, embroidery is performed again to form a part of the thread end on the reverse side of the fabric;

[0038] Step 2: After completing step 1, the second pull rod (7) of the second thread trimming device drives the second fixed blade (18) to rotate and cooperate with the second movable knife (5) to control the needle to hook the upper thread end to the spring sheet and pause so that the upper thread end is pressed by the spring sheet. After the needle is controlled to complete 2-3 stitches, the second movable knife merges and cuts the pressed upper thread. At this time, the length of this part of the upper thread end is from the blade of the second fixed knife to the center of the needle plate hole, and the action is completed.

[0039] The above describes in detail the preferred implementation of this patent, but this patent is not limited to the above implementation. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. An embroidery machine thread trimming device for trimming the ends of bottom threads, comprising a hook box (1) equipped with a hook (36), characterized in that: The rotary hook box (1) is provided with a first thread trimming device and a second thread trimming device on both sides of the rotary hook (36), respectively. The first thread trimming device trims the bottom thread of the completed stitch, and the second thread trimming device trims the upper thread ends on the reverse side of the fabric after the stitch is formed when the first thread trimming device trims.

2. The thread trimming device for an embroidery machine for trimming the bottom thread ends according to claim 1, characterized in that: The first thread trimming device comprises a first pull rod (8), the first pull rod (8) is connected to a first connecting rod (27) via a first clamping block (10), the first connecting rod (27) is connected to a first movable knife driving rod (24), the first movable knife driving rod (24) is connected to a first movable knife (21), and the first movable knife (21) cooperates with a first fixed blade (19).

3. The thread trimming device for an embroidery machine for trimming the thread ends of the bottom thread according to claim 2, characterized in that: The second thread trimming device comprises a second pull rod (7), the second pull rod (7) is connected to a second connecting rod (12) via a second clamping block (11), the second connecting rod (12) is connected to a second movable knife driving rod (15), the second movable knife driving rod (15) is connected to a second movable knife (5), and the second movable knife (5) cooperates with a second fixed blade (18).

4. The thread trimming device for an embroidery machine for trimming the thread ends of the bottom thread according to claim 2, characterized in that: The first pull rod (8) is vertically connected to the first clamping block (10), the first clamping block (10) drives the first connecting rod (27) to rotate, the first connecting rod (27) is rotatably connected to the first movable knife driving rod (24) through the third connecting rod (25), and the first clamping block (10) and the first movable knife driving rod (24) are parallel to each other.

5. The thread trimming device for an embroidery machine for trimming the bottom thread ends according to claim 1, characterized in that: The second pull rod (7) is vertically connected to the second clamping block (11), the second clamping block (11) drives the second connecting rod (12) to rotate, the second connecting rod (12) is rotatably connected to the second movable knife driving rod (15) through the fourth connecting rod (13), and the second clamping block (11) and the second movable knife driving rod (15) are parallel to each other.

6. The thread trimming device for an embroidery machine for trimming the bottom thread ends according to claim 2, characterized in that: A spring pressing piece (4) is provided on the upper side of the first fixed blade (19), and the spring pressing piece (4) is pressed against the first fixed blade (19).

7. The thread trimming device for an embroidery machine for trimming the bottom thread ends according to claim 2, characterized in that: The first pull rod (8) and the second pull rod (7) are parallel to each other, and the two pull rods are connected via a double-hole shaft sleeve (9). The double-hole shaft sleeve (9) is provided with an integral positioning rod (14), and the positioning rod (14) is fixedly connected to the rotary hook box (1).

8. The thread trimming device for an embroidery machine for trimming the bottom thread ends according to claim 1, characterized in that: The rotary hook box (1) is provided with an integral first mounting arm (2) and a second mounting arm (6) on both sides of the rotary hook (36), the first mounting arm (2) is fixedly connected to the first mounting plate (23), the first mounting plate (23) is pressed against the first positioning block (28) and the first fixed blade (19), the first mounting plate (23) is connected to the first movable knife driving rod (24) through the first mounting hole, the second mounting arm (6) is fixedly connected to the second mounting plate (26), the second mounting plate (26) is pressed against the second positioning block (16) and the second fixed blade (18), and the second mounting plate (26) is connected to the second movable knife driving rod (15) through the second mounting hole.

9. The thread trimming device for an embroidery machine for trimming the bottom thread ends according to claim 8, characterized in that: The first positioning block (28) has a first positioning surface on its side that matches the first movable knife (21), and the second positioning block (16) has a second positioning surface on its side that matches the second movable knife (5).

10. An embroidery machine thread trimming method for trimming bottom thread ends according to any one of claims 1 to 8, characterized in that: The following steps are included Step 1: After the embroidery needle of the embroidery machine completes embroidery, the first pull rod (8) of the first thread cutting device drives the first fixed blade (19) to rotate and cooperate with the first movable knife (21) to cut the bottom line output by the rotary shuttle. The bottom line cooperates with the surface thread connected by the embroidery needle, and after cutting, embroidery is performed again to form a part of the thread end on the reverse side of the fabric; Step 2: After completing step 1, the second pull rod (7) of the second thread trimming device drives the second fixed blade (18) to rotate and cooperate with the second movable knife (5) to control the needle to hook the upper thread end to the spring sheet and pause so that the upper thread end is pressed by the spring sheet. After the needle is controlled to complete 2-3 stitches, the second movable knife merges and cuts the pressed upper thread. The length of this part of the upper thread end is from the blade of the second fixed knife to the center of the needle plate hole, and the action is completed.

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