A method of thread trimming for embroidery

Abstract

The application discloses a thread cutting method for embroidery. When the thread cutting starts, the thread is hooked by a hooking cutter and is pulled back to make the surface thread in a tight state. When the moving cutter starts to move towards the fixed cutter, the hooking cutter continues to pull back to make the surface thread tight on the moving cutter, which can effectively prevent the moving cutter from failing to hook the thread due to the change of the surface thread tension. When the moving cutter moves towards the needle plate hole for the first time, the thread amount on the moving cutter increases, the hooking cutter moves forward to retreat the thread, and the surface thread on the moving cutter is in a normal or relaxed state, so that the surface thread can be effectively prevented from being pulled off, and the surface thread can be accurately cut off by the moving cutter. The method can be realized based on the hardware structure of the embroidery machine, and the thread cutting is accurate and effective.

Description

Technical Field

[0001] This invention relates to a method for cutting threads for embroidery. Background Technology

[0002] When the embroidery machine needs to cut the thread during the embroidery process, as the moving blade hooks the thread and rotates towards the stationary blade, the tension of the thread on both sides of the moving blade changes continuously. At this time, the thread on the side of the moving blade near the needle is relatively loose, and as the moving blade rotates, there is a certain probability that the thread will slip off the moving blade, resulting in a failed thread cutting.

[0003] As the moving blade continues to rotate and passes the needle, the thread on the side of the moving blade located on the needle becomes taut, making it easy to break; or because the thread tension is too high, the thread is prone to splitting when cutting; or the thread with high tension is prone to coming off the needle after cutting. Summary of the Invention

[0004] To address the problem that existing embroidery machines cannot effectively adapt to changes in thread tension during thread trimming, this invention provides a thread trimming method for embroidery machines that can be based on existing technological structures.

[0005] The technical solution of this invention to solve the existing problems is a method for cutting thread in embroidery. When it is necessary to cut thread during the embroidery process, the steps are as follows: 1) Open the cutting blade to its maximum opening and separate the noodle thread to the back of the blade.

[0006] 2) Use the hook knife to hook the line and pull the line back to make it taut.

[0007] 3) The moving blade begins to move towards the stationary blade, and the hook blade continues to pull back, so that the noodle thread is taut on the moving blade and will not break.

[0008] 4) When the moving knife moves to the needle hole as early as possible, the demand for thread on the moving knife increases, and the hook knife moves forward to retract the thread, so that the thread on the moving knife is in a normal or relaxed state.

[0009] 5) Combine the moving and stationary blades to complete the thread cutting.

[0010] As a further improvement, in step 2), the hook knife is pulled back to 1 / 4-3 / 4 of its stroke range.

[0011] As a further improvement, in step 3), the hook knife is pulled back for another 3-6mm.

[0012] As a further improvement, in step 4), the hook knife moves in the opposite direction for 3-6mm to remove the thread.

[0013] As a further improvement, in step 4), when the moving knife moves to 1 / 2 of the fixed knife, the moving knife has passed the needle plate eye, and the amount of thread required on the moving knife increases. The hook knife moves forward to retract the thread, so that the surface thread is in a normal or relaxed state on the moving knife.

[0014] As a further improvement, step 6) is also included, after the line is cut, the hook knife returns to the highest point, and the line cutting is completed.

[0015] As a further improvement, in step 2), the hook knife hooks the thread and pulls the thread back to make the thread taut, and the thread-taking spring is also in a twisted state at this time.

[0016] As a further improvement, step 2) also includes 2.1) after the thread holder closes and locks the thread, the jump motor drives the needle bar driver to disengage from the needle bar, and the embroidery machine spindle continues to rotate at an appropriate angle, so that the thread take-up assembly feeds the thread towards the needle, and the thread above the thread holder is relaxed; the appropriate angle is a certain amount of thread that can drive the thread take-up assembly to feed the thread towards the needle, which can prevent the thread end from coming out of the needle hole after the thread is cut.

[0017] As a further improvement, in step 2.1), the main shaft of the embroidery machine continues to rotate at an appropriate angle, so that the thread take-up assembly continuously feeds the thread towards the needle through the thread adjuster, so that the thread above the thread holder is relaxed; after the thread is kept appropriately relaxed, the thread take-up spring on the thread adjuster is tightened when the thread is fed; when the fixed blade closes in step 5) and the thread is cut, the thread take-up spring on the thread adjuster is reset, so that the relaxed thread is kept under normal tension.

[0018] As a further improvement, the appropriate angle for the spindle rotation is one revolution.

[0019] Compared with existing technologies, this invention, at the start of thread cutting, uses a hook blade to hook the thread and pull it back, keeping the thread taut. As the moving blade begins to move towards the stationary blade, the hook blade continues to pull back, keeping the thread taut on the moving blade. This effectively prevents the moving blade from failing to hook the thread due to changes in thread tension during its movement. When the moving blade reaches the needle eye as early as its move towards the stationary blade, the required thread load on the moving blade increases, causing the hook blade to move forward and retract the thread, keeping the thread in a normal or relaxed state on the moving blade. This effectively prevents the thread from breaking, allowing for precise cutting by the moving blade.

[0020] Its beneficial effect is that the method of the present invention can be implemented entirely based on the hardware structure of the embroidery machine, ensuring accurate thread cutting and effectively avoiding thread cutting errors. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] Figure 2 yes Figure 1 An enlarged schematic diagram of point a.

[0023] Figure 3 yes Figure 1 An enlarged schematic diagram of point b.

[0024] Figure 4-5 This is a side view of the wire feeding assembly.

[0025] Figure 6 This is a schematic diagram of the structure of the present invention.

[0026] Figure 7-9 This is a schematic diagram of different states of wire cutting according to the present invention. Detailed Implementation

[0027] In this invention, "front" and "back" are relative concepts. During the reciprocating motion of the hook cutter after hooking the line, the direction of motion that increases the tension of the hooked line is "back," and the direction corresponding to "back" is "front." Specifically, in this embodiment and accompanying drawings, the direction of the hook cutter's movement backward and upward after hooking the line is "back," and the direction of its movement downward and forward is "front."

[0028] See Figure 1-9 A method for cutting thread during embroidery. When it is necessary to cut the thread during the embroidery process, the steps are as follows: 1) See Figure 3 , 6 7. Open the cutting knife 1 to its maximum size and cut the noodle thread 2 to the back of the knife.

[0029] 2) The hook knife 3 hooks the line and pulls the line 2 back, that is, moves backward and upward, so that the line 2 is taut, so that the line 2 can be closely matched with the moving knife 1 when the moving knife 1 is preparing for the initial action.

[0030] 3) The moving blade 1 begins to move towards the stationary blade, while the hook blade 3 continues to pull back, further engaging the thread 2 with the moving blade 1. This tightens the thread 2 onto the moving blade 1, preventing it from breaking. With the initial movement of the moving blade, the engagement between the thread and the blade becomes more precise, allowing the moving blade 1 to accurately hook onto the thread as it moves towards the stationary blade. This prevents the thread 2 from accidentally detaching from the moving blade due to changing tension or relaxation, thus avoiding a failed cut.

[0031] 4) See Figure 8 When the moving blade 1 moves to the needle plate eye as early as possible, the demand for thread on the moving blade 1 increases. The hook blade 3 moves forward to pull the thread back, so that the top thread 2 is in a normal or slack state on the moving blade 1, preventing the top thread from breaking due to excessive tension, and preparing for the upcoming thread cutting.

[0032] 5) See Figure 9 The moving blade 1 and the fixed blade work together to cut the wire. After cutting the wire, the moving blade 1 can be reset to prepare for the next wire cutting.

[0033] For other actions during thread cutting on an embroidery machine, such as but not limited to the needle bar and presser foot, if not covered in the above steps, the corresponding thread cutting actions can be completed entirely according to existing technical requirements.

[0034] As a preferred implementation example, in step 2), the hook 3 is pulled back to 1 / 4-3 / 4 of its stroke range.

[0035] As a preferred implementation example, in step 3), the hook knife 3 is pulled back 3-6mm to tighten the surface thread on the moving knife 1.

[0036] As a preferred implementation example, in step 4), the hook knife 3 moves in the opposite direction for 3-6mm to retract the thread, so that the thread is in a slightly relaxed state on the moving knife, in preparation for cutting the thread.

[0037] As a preferred implementation example, in step 4), when the moving knife 1 moves to 1 / 2 of the fixed knife, the moving knife 1 has passed the needle plate eye, and the demand for thread on the moving knife 1 increases. The hook knife 3 moves forward to retract the thread, so that the surface thread 2 is in a normal or relaxed state on the moving knife 1.

[0038] As a preferred implementation case, it also includes step 6) after the line is cut, the hook knife 3 returns to the very back, that is, the highest point at the very top, and the line is completed.

[0039] As a preferred implementation example, in step 2), the hook 3 hooks the thread and pulls the top thread 2 back, making the top thread 2 taut. At this time, the thread take-up spring 6 is also in a twisted state. Step 2) also includes 2.1) After the top thread holder 21 closes and locks the top thread 2, the jump motor drives the needle bar driver to disengage from the needle bar 7, and the embroidery machine spindle continues to rotate at an appropriate angle, so that the thread take-up assembly 4 feeds the thread towards the needle, and the top thread 2 above the top thread holder 21 is relaxed; the appropriate angle is a certain amount of thread that can drive the thread take-up assembly 4 to feed towards the needle, preventing the thread end of the top thread 2 from coming out of the needle hole after cutting.

[0040] In step 2.1), the embroidery machine spindle continues to rotate at an appropriate angle, causing the thread take-up assembly 4 to continuously feed the thread towards the needle via the thread holder 5, thus slackening the thread 2 above the thread holder 21. After the thread 2 is kept appropriately slack, the thread take-up spring 6 on the thread holder 5 is tightened when the thread 2 is fed. When the moving knife 1 and the fixed knife complete the thread cutting in step 5), as the thread take-up assembly 4 stops feeding the thread, the thread take-up spring 6 on the thread holder 5 returns to its original position, so that the slack thread 2 maintains normal tension, allowing it to work normally directly when entering the next section of embroidery.

[0041] In step 2.1), the moving and fixed blades of the thread-cutting mechanism work together to cut the thread. Since the top thread is cut in a relaxed state, the thread end is relatively cut off due to the lack of tension, leaving it relatively intact. After cutting, the thread end will not come out of the needle due to the tension of the top thread. Therefore, the thread-catching fork and drive structure are no longer needed during the thread-cutting process, greatly optimizing the embroidery machine. This thread-cutting method can be based entirely on the existing embroidery machine structure, requiring only program adjustments and optimizations to achieve normal thread cutting without affecting subsequent embroidery.

[0042] The appropriate angle for the main shaft rotation is one revolution. With one revolution of the main shaft, the thread take-up assembly 4 can be entirely based on existing technology; typically, one revolution of the main shaft is sufficient to perform both thread feeding and take-up actions. This allows the embroidery machine to quickly and smoothly move on to the next section of embroidery after completing the thread trimming of one embroidery.

Claims

1. A method of cutting thread for embroidery, when the thread needs to be cut during the embroidery process, characterized in that: The steps are as follows: 1) Open the cutting blade to its maximum opening and separate the noodle thread to the back of the blade; 2) Hook the thread with the hook knife and pull the thread back to make the thread taut. At this time, the thread take-up spring is also in a twisted state. 2.1) After the thread holder closes and locks the thread, the jump motor drives the needle bar driver to disengage from the needle bar, and the embroidery machine spindle continues to rotate at an appropriate angle, causing the thread take-up assembly to feed the thread towards the needle, thus loosening the thread above the thread holder; the appropriate angle is a certain amount of thread that can be driven to feed the thread take-up assembly towards the needle to prevent the thread end from coming out of the needle hole after cutting. 3) The moving blade begins to move towards the stationary blade, and the hook blade continues to pull back, so that the noodle thread is taut on the moving blade and will not break. 4) When the moving knife moves to the needle plate eye as early as the fixed knife, the demand for thread on the moving knife increases, and the hook knife moves forward to retract the thread, so that the thread on the moving knife is in a normal or relaxed state. Among them, the hook knife moves in the reverse direction 3 6mm thread retraction; when the moving knife moves to 1 / 2 of the fixed knife, the moving knife has passed the needle plate eye, and the amount of thread required on the moving knife increases. The hook knife moves forward to retract the thread, so that the surface thread is in a normal or relaxed state on the moving knife. 5) Combine the moving and stationary blades to complete the thread cutting.

2. The method for cutting embroidery thread as described in claim 1, characterized in that: In step 2), the hook cutter pulls back the line, completing 1 / 4 of the hook cutter's stroke range. 3 / 4 of the way.

3. The method for cutting embroidery thread as described in claim 1, characterized in that: In step 3), the hook knife continues to pull back 3... 6mm.

4. The method for cutting embroidery thread as described in claim 1, characterized in that: It also includes step 6) After cutting the line, the hook knife returns to the highest point, and the line cutting is completed.

5. The method for cutting embroidery thread as described in claim 1, characterized in that: In step 2.1), the embroidery machine spindle continues to rotate at an appropriate angle, causing the thread take-up assembly to continuously feed the thread towards the needle via the thread adjuster, thus slackening the thread above the thread holder. After the thread is kept appropriately slack, the thread take-up spring on the thread adjuster is tightened when the thread is fed. When the fixed blade and closed blade complete the thread cutting in step 5), the thread take-up spring on the thread adjuster resets, so that the slack thread maintains normal tension.

6. The method for cutting embroidery thread as described in claim 5, characterized in that: The appropriate angle for the spindle to rotate is one revolution.

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