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

Abstract

An embroidery machine thread trimming device used for trimming thread ends of bottom threads and upper threads 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 the bottom threads and the upper threads output by the rotating shuttle, the bottom threads are matched with the upper threads connected with embroidery needles, and the second thread trimming device shears the lower threads and the upper threads 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, namely, the bottom threads are sheared off after embroidery is completed to form fabric reverse side 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] This utility model relates to the field of embroidery machine thread trimming technology, and in particular to an embroidery machine thread trimming device for trimming thread ends of uniform length on the reverse side of fabric. Background Technology

[0002] In embroidery machines, the relationship between the top thread (connected to the needle) and the bottom thread (located on the rotary hook) is a crucial aspect of the embroidery process. The top thread runs above the fabric during embroidery, while the rotary hook forms the bottom thread below. The coordination between these two elements directly impacts the quality and final result of the embroidery.

[0003] The relationship between the top line and the inner bottom line of the rotary hook:

[0004] Line tension adjustment:

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

[0006] The bottom tension also needs to be adjusted appropriately to form a good interweaving with the top line.

[0007] Line formation:

[0008] The top and bottom threads need to be evenly interwoven on both sides of the fabric. The top thread passes through the fabric through the needle eye, and the shuttle rotates underneath the fabric, interweaving the bottom and top threads to form a strong stitch.

[0009] The aforementioned problems arise because embroidery machines typically require a cutting device to trim the thread ends after embroidery is completed. However, these devices are often complex in structure, cumbersome to operate, and prone to incomplete trimming, leaving thread ends that are either too long or too short. Since the length of this top thread varies depending on the fabric, it is normally less than 1 cm, but in reality, it is often more than 2 cm long, causing significant maintenance difficulties for subsequent processes. Therefore, this invention proposes a thread trimming device for embroidery machines to trim the bottom thread ends, aiming to improve the uniformity of thread length on the back of the fabric. Utility Model Content

[0010] This utility model provides a thread trimming device for embroidery machines to trim thread ends on the reverse side of fabric, which improves the consistency of thread end length on the back of embroidered fabric and allows for length adjustment, aiming to achieve the technical standard of zero thread end length.

[0011] A thread-cutting device for embroidery machines, used for trimming the thread ends of the bottom and top threads, includes a shuttle box with a rotary shuttle. The shuttle box has a first thread-cutting device and a second thread-cutting device installed on both sides of the shuttle. The first thread-cutting device cuts the bottom and top threads of the stitch, with the bottom thread connecting to the top thread of the embroidery needle. The second thread-cutting device cuts the thread ends of the top thread on the reverse side of the fabric at the start of the stitch, after the first thread-cutting device has finished cutting. This embroidery machine thread-cutting device, by cutting the bottom and top threads of the stitch using the first thread-cutting device (which is initially in the embroidery needle-connected bottom thread embroidery state), requires cutting the bottom and top threads after the stitch is completed to allow the embroidery needle to proceed to the next pattern. The second thread-cutting device of this invention cuts the thread ends of the top thread on the reverse side of the fabric at the start of the stitch, adjusting the initial length of the bottom and top threads during the next pattern's stitch connection. This means that regardless of issues such as poor synchronization between the bottom and top threads, floating threads, or loose threads, the bottom thread ends will not be inconsistent in length; they will all be cut by the second thread-cutting device to a length consistent with the bottom thread ends cut by the first thread-cutting device. Having consistent thread lengths at the bottom edge can greatly improve the appearance and comfort of the fabric's back side.

[0012] The first wire-cutting device includes a first pull rod, which is connected to a first connecting rod via a first clamping block. The first connecting rod is connected to a first movable blade drive rod, which is connected to a first movable blade. The first movable blade cooperates with a first fixed blade to perform a cutting operation.

[0013] The second wire-cutting device includes a second pull rod, which is connected to a second connecting rod via a second clamping block. The second connecting rod is connected to a second movable blade drive rod, which is connected to a second movable blade. The second movable blade cooperates with a second fixed blade to perform a cutting operation.

[0014] The first pull rod is vertically connected to the first clamping block, and the first clamping block drives the first connecting rod to rotate. The first connecting rod is rotatably connected to the first movable blade drive rod through the third connecting rod. The first clamping block and the first movable blade drive rod are parallel to each other. This drive structure moves horizontally back and forth through the first pull rod, and the first pull rod is vertically connected to the first clamping block. The first clamping block drives the first connecting rod to rotate, forming a rotational driving force on the vertically set first movable blade drive rod. This is more stable than the traditional motor-connecting rod swing drive.

[0015] The second pull rod is vertically connected to the second clamping block, which drives the second connecting rod to rotate. The second connecting rod is rotatably connected to the second movable blade drive rod via a fourth connecting rod. The second clamping block and the second movable blade drive rod are parallel to each other. This drive structure allows the second pull rod to move horizontally back and forth, while the second pull rod is vertically connected to the second clamping block. The second clamping block drives the second connecting rod to rotate, generating a rotational driving force for the vertically positioned second movable blade drive rod. This design is more stable than traditional motor-connecting rod swing drives.

[0016] The first fixed blade is provided with a spring pressure plate on its upper side. The spring pressure plate presses against the first fixed blade. The spring pressure plate causes the first fixed blade and the first movable blade to have a certain vertical shearing pressure during the shearing process, which improves the shearing effect and extends the service life of the first movable blade.

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

[0018] The rotary hook box has an integral first mounting arm and a second mounting arm on each side of the rotary hook. The first mounting arm is fixedly connected to a first mounting plate, which presses against a first positioning block and a first fixed blade. The first mounting plate is connected to a first movable blade drive rod through a first mounting hole. The second mounting arm is fixedly connected to a second mounting plate, which presses against a second positioning block and a second fixed blade. The second mounting plate is connected to a second movable blade drive rod through a second mounting hole. This mounting structure improves the stability of the positions of the first and second fixed blades, avoiding loosening and displacement problems after long-term operation.

[0019] The first positioning block has a first positioning surface on its side that mates with the first movable blade, and the second positioning block has a second positioning surface on its side that mates with the second movable blade. Both the first and second positioning surfaces improve the positioning accuracy during the reciprocating shearing process of the first and second movable blades, reducing cumulative errors.

[0020] A method for trimming thread ends on the reverse side of fabric using an embroidery machine includes the following steps.

[0021] Step 1: After the embroidery needle of the embroidery machine completes the embroidery, the first fixed blade is driven to rotate by the first pull rod of the first thread cutting device, and the first movable blade cuts the bottom thread output by the rotary hook. The bottom thread is connected to the top thread of the embroidery needle. After cutting, it is embroidered again to form a part of the thread end on the reverse side of the fabric.

[0022] Step 2: After completing Step 1, the second pull rod of the second thread cutting device drives the second fixed blade to rotate, which in turn controls the second movable blade to lower the needle and hook the end of the top thread to the spring plate, where it stops and is pressed down by the spring plate. After the needle completes 2-3 stitches, the second movable blade closes and cuts the pressed top thread. At this time, the length of this part of the top thread end is from the edge of the second fixed blade to the center of the needle plate hole, and the action is completed.

[0023] This invention uses a first thread-cutting device to cut the bottom thread of the stitch. The bottom thread is connected to the top thread of the embroidery needle. That is, after the bottom thread is cut after the embroidery is completed, the second embroidery creates a thread end on the reverse side of the fabric, which makes it easier for the embroidery needle to embroider the next pattern. The second thread-cutting device cuts the thread end created by the first thread-cutting device after the second embroidery. The length of the starting thread end of the second embroidery is the same as the length of the bottom thread end on the reverse side of the fabric. Attached Figure Description

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

[0025] Figure 1 This is a three-dimensional structural diagram of a thread-cutting device for trimming the ends of bottom threads in an embroidery machine according to the present invention.

[0026] Figure 2 This is a three-dimensional structural diagram of an embroidery machine thread trimming device for trimming the thread ends on the bottom surface, according to the present invention.

[0027] Figure 3 This is a schematic diagram of the installation structure of the first and second wire cutting devices in this utility model;

[0028] Figure 4 This is a schematic diagram of the installation structure of the first and second wire cutting devices in this utility model from another angle.

[0029] Figure 5 This is a schematic diagram of the mounting structure of the first movable blade and the first fixed blade in this utility model;

[0030] Figure 6 This is a schematic diagram of the installation structure of the second movable blade and the second fixed blade in this utility model. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-6 The specific implementation details the technical solution of this patent. An embroidery machine thread trimming device for trimming bottom thread ends includes a rotary hook box 1 with a rotary hook 36 installed. A first thread trimming device and a second thread trimming device are respectively installed on both sides of the rotary hook 36 in the rotary hook box 1. The first thread trimming device trims the bottom thread and top thread of the stitch. At this time, the bottom thread aligns with the top thread connected by the embroidery needle. The second thread trimming device trims the top thread ends on the reverse side of the fabric when the first thread trimming device starts stitching, ensuring the consistency of the length of all thread ends on the back of the fabric.

[0032] The preferred structural design of the first wire-cutting device includes a first pull rod 8, which 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 blade drive rod 24, which is connected to a first movable blade 21. The first movable blade 21 engages with a first fixed blade 19. A spring pressure plate 4 is provided on the upper side of the first fixed blade 19, which presses against the first fixed blade 19. The spring pressure plate 4 also presses against the first movable blade 21 during the cutting process to improve cutting performance. The second wire-cutting device includes a second pull rod 7, which 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 blade drive rod 15, which is connected to a second movable blade 5. The second movable blade 5 engages with a second fixed blade 18.

[0033] To further improve the cutting stability of the first wire cutting 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 blade drive rod 24 through the third connecting rod 25. The first clamping block 10 and the first movable blade drive rod 24 are parallel to each other. The first pull rod 8 and the second pull rod 7 are parallel to each other and are connected by a double-hole bushing 9. The double-hole bushing 9 is equipped with an integrated positioning rod 14, which is fixedly connected to the rotary shuttle box 1. The high-frequency synchronization of the first and second wire cutting devices is improved by the parallel reciprocating motion of the first pull rod 8 and the second pull rod 7.

[0034] To further improve the cutting 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. The second connecting rod 12 is rotatably connected to the second movable blade drive rod 15 through the fourth connecting rod 13. The second clamping block 11 and the second movable blade drive rod 15 are parallel to each other.

[0035] As a structural priority, the rotary hook box 1 has 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, which presses against the first positioning block 28 and the first fixed blade 19. The first mounting plate 23 is connected to the first movable blade drive rod 24 through the first mounting hole. The second mounting arm 6 is fixedly connected to the second mounting plate 26, which presses against the second positioning block 16 and the second fixed blade 18. The second mounting plate 26 is connected to the second movable blade drive rod 15 through the second mounting hole. The first positioning block 28 has a first positioning surface on its side that mates with the first movable blade 21, and the second positioning block 16 has a second positioning surface on its side that mates with the second movable blade 5.

[0036] A method for trimming thread ends on the reverse side of fabric using an embroidery machine includes the following steps.

[0037] Step 1: After the embroidery needle of the embroidery machine completes the embroidery, the first fixed blade (19) is driven to rotate by the first pull rod (8) of the first thread cutting device and cooperates with the first movable blade (21) to cut the bottom thread output by the rotary hook. The bottom thread is connected to the face thread of the embroidery needle and is cut and then embroidered 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 cutting device drives the second fixed blade (18) to rotate and cooperate with the second movable blade (5) to control the needle to hook the end of the thread to the spring plate and stop so that the end of the thread is pressed by the spring plate. After the needle completes 2-3 stitches, the second movable blade closes and cuts the pressed thread. At this time, the length of this part of the thread end is from the blade of the second fixed blade to the center of the needle plate hole. The action is completed.

[0039] The preferred embodiments of this patent have been described in detail above. However, this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.

Claims

1. A thread trimming device for embroidery machines, comprising a rotary hook box (1) with a rotary hook (36) installed, characterized in that: The rotary hook box (1) is equipped with a first thread cutting device and a second thread cutting device on both sides of the rotary hook (36). The first thread cutting device cuts the bottom line of the finished thread. The first thread cutting device includes a first pull rod (8). The first pull rod (8) is connected to a first connecting rod (27) through a first clamping block (10). The first connecting rod (27) is connected to a first movable blade drive rod (24). The first movable blade drive rod (24) is connected to a first movable blade (21). The first movable blade (21) cooperates with a first fixed blade (19).

2. The embroidery machine thread trimming device for trimming the thread ends on the bottom surface according to claim 1, characterized in that: The second wire cutting device includes a second pull rod (7), which 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 blade drive rod (15), which is connected to a second movable blade (5). The second movable blade (5) cooperates with a second fixed blade (18).

3. The embroidery machine thread trimming device for trimming the thread ends on the bottom surface according to claim 1, 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 drive rod (24) through the third connecting rod (25). The first clamping block (10) and the first movable knife drive rod (24) are parallel to each other.

4. The embroidery machine thread trimming device for trimming the thread ends on the bottom surface according to claim 2, 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 drive rod (15) through the fourth connecting rod (13), and the second clamping block (11) and the second movable knife drive rod (15) are parallel to each other.

5. The embroidery machine thread trimming device for trimming the thread ends on the bottom surface according to claim 1, characterized in that: The first fixed blade (19) is provided with a spring pressure plate (4) on its upper side, and the spring pressure plate (4) presses against the first fixed blade (19).

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

7. The embroidery machine thread trimming device for trimming the thread ends on the bottom surface according to claim 1, characterized in that: The rotary hook box (1) has 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) presses against the first positioning block (28) and the first fixed blade (19). The first mounting plate (23) is connected to the first movable blade drive 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) presses against the second positioning block (16) and the second fixed blade (18). The second mounting plate (26) is connected to the second movable blade drive rod (15) through the second mounting hole.

8. The embroidery machine thread trimming device for trimming the thread ends on the bottom surface according to claim 7, characterized in that: The first positioning block (28) has a first positioning surface on its side that cooperates with the first movable blade (21), and the second positioning block (16) has a second positioning surface on its side that cooperates with the second movable blade (5).

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