A bone cutting device based on a bar tacking machine

Abstract

This invention relates to garment machinery, specifically a boning and thread-cutting device based on a bartacking machine. Unlike existing technologies, this invention features one or two boning grooves on the needle plate of the bartacking machine, oriented along the swing direction of the presser foot during bartacking. An exhaust pipe is fixed below the needle plate, near the boning grooves, with its opening communicating with the grooves. A thread-cutting mechanism is installed below the needle plate, near the opening of the exhaust pipe. Compared to existing technologies, this invention not only cuts excess thread on garment pieces but also, through the cooperation of the boning grooves on the needle plate and the presser foot, presses down the boning area and encloses the thread ends, reducing the need for workers to trim thread ends and perform boning, thus improving work efficiency.

Description

Technical Field

[0001] This invention relates to garment machinery, specifically a boning and thread-cutting device based on a bartacking machine. Background Technology

[0002] A bartack sewing machine, also called a bartending machine or bark-tying machine, is typically used to reinforce stitches. There are two main types of bartack machines: one represented by the JUKI bartack machine and the other by the Brother bartack machine. Their function is to use a presser foot to move the garment piece on the needle plate, thus creating a reinforced stitch on the garment piece.

[0003] In some garment production processes, it's necessary to tuck the overlocked thread ends into the seam allowance and then reinforce them with a loop stitch. This prevents the overlocked thread ends from coming undone and improves the appearance. Currently, this process requires manual trimming of the thread ends, tucking in the thread ends, and bending the seam allowance before finally sewing on a loop stitching machine. However, this method is labor-intensive and inefficient. Summary of the Invention

[0004] To overcome the aforementioned defects or one of the defects in the prior art, this invention discloses a barbed thread cutting device based on a bar knotting machine, the technical solution of which is:

[0005] A thread-cutting device based on a knotting machine, unlike existing technologies, has one or two bone-receiving grooves on the needle plate of the knotting machine along the swing direction of the presser foot during knotting. An exhaust pipe is fixed below the needle plate near the bone-receiving grooves, and the opening of the exhaust pipe is connected to the bone-receiving grooves. A thread-cutting mechanism is installed below the needle plate near the opening of the exhaust pipe.

[0006] Furthermore, the upper corner of one of the long sides of the bone groove is chamfered to form a chamfered bevel.

[0007] Furthermore, the thread cutting mechanism includes a cylinder fixed below the needle plate, a fixed blade, and a movable blade that is connected to the fixed blade. The cutting edge of the fixed blade and the cutting edge of the movable blade form a cutting pair. The two ends of the connecting rod are respectively connected to the opposite end of the cutting edge of the movable blade and the free end of the cylinder rod.

[0008] Furthermore, a pipe head is fixed at the opening of the exhaust pipe, and the pipe head extends upward from the opening end of the exhaust pipe to form a boss. The upper surface of the boss is fixed to the lower surface of the needle plate, and the lower surface of the needle plate forms a gap with the opening end of the exhaust pipe. The cutting edge of the fixed knife is located in the gap, and the cutting edge of the moving knife can enter or leave the gap.

[0009] Furthermore, the lower part of the moving blade abuts against the clamping plate that rotates with the moving blade.

[0010] Furthermore, the width of the bone groove is 2-4mm, and its length is greater than the swing amplitude when the presser foot is attached.

[0011] Furthermore, the length of the thread end after the thread cutting mechanism cuts the thread is 5-10mm.

[0012] Compared with existing technologies, this invention can not only cut off excess thread ends on garment pieces, but also press down the seams and wrap the thread ends by using the seam groove opened on the needle plate in conjunction with the presser foot, reducing the steps of trimming thread ends and pressing down the seams, and improving work efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of Example 1.

[0014] Figure 2 This is a structural schematic diagram from another perspective of Example 1.

[0015] Figure 3 This is a schematic diagram of the exhaust pipe and pipe head in Example 1.

[0016] Figure 4 This is a schematic diagram of the structure of Example 2.

[0017] Figure 5 This is a structural schematic diagram from another perspective of Example 2.

[0018] Figure 6 for Figure 5 A schematic diagram of the structure after concealing the exhaust duct and duct head.

[0019] Figure 7 This is a schematic diagram of the exhaust pipe and pipe head in Example 2. Detailed Implementation

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Example 1: A reverse thread cutting device based on a heavy machinery knotting machine, such as... Figure 1-3As shown, two grooves 101 are formed on the needle plate 100 of the heavy machine fitting machine along the forward and backward swing direction when the presser foot 200 is fitting. A tube head 6 is fixed at the middle position of the two grooves 101 below the needle plate 100. The opening of the exhaust pipe 1 is fixedly connected to the tube head 6. The tube head 6 extends upward from the opening end of the exhaust pipe 1 to form a boss 61. The upper end face of the boss 61 is fixedly connected to the lower surface of the needle plate 100. A gap 62 is formed between the lower surface of the needle plate 100 and the opening end of the exhaust pipe 1. The needle plate 100 corresponding to the opening end of the exhaust pipe 1... A vent 103 is provided on the needle plate 100 so that the opening of the exhaust pipe 1 communicates with the bone-holding groove 101. A thread-cutting mechanism is installed near the opening of the exhaust pipe 1. The thread-cutting mechanism includes a cylinder 2 fixed below the needle plate 100, a fixed blade 3, and a movable blade 4 that rotates with the fixed blade 3. The cutting edges of the fixed blade 3 and the movable blade 4 form a shearing pair. The two ends of the connecting rod 5 are respectively rotated to the opposite end of the cutting edge of the movable blade 4 and the free end of the cylinder rod of the cylinder 2. The cutting edge of the fixed blade 3 is located within the gap 62, and the cutting edge of the movable blade 4 can enter or leave the gap 62. The lower part of the movable blade 4 abuts against a thread-clamping plate 7 that rotates with the movable blade 4.

[0022] The upper corner of the left long side of the left-side bone groove 101 is chamfered to form a chamfered surface 102, and the upper corner of the right long side of the right-side bone groove 101 is also chamfered to form a chamfered surface 102. The width of the bone groove 101 is 2-4mm, slightly larger than the thickness of the garment piece bone, and the length is greater than the swing amplitude when the presser foot 200 is attached. The length of the thread end after the thread cutting mechanism is 5-10mm, slightly smaller than the width of the garment piece bone, so that the thread end can be completely hidden within the bent bone.

[0023] When performing a loop stitch with the bobbin position tilted to the right, the bobbin position of the garment piece is inserted into the left-side bobbin groove 101. After the garment piece covers the eyelet on the needle plate 100, the exhaust fan is activated, and excess thread ends are sucked into the exhaust pipe 1 below the needle plate 100. The thread cutting mechanism is then activated, and the moving blade swings to the fixed blade side to cut off the excess thread ends. The thread clamping plate 7 clamps the thread end connected to the garment piece. At this time, the presser foot 200 moves the garment piece to the left by 3-5mm. Under the pressure of the presser foot 200 and guided by the inclined surface 102 on the left long side of the bobbin groove 101, the bobbin position in the bobbin groove 101 tilts to the right. At the same time, the thread end clamped under the thread clamping plate 7 is pulled tight and buried in the tilted bobbin position. Then, the presser foot 200 moves the garment piece back and forth, and the needle of the loop stitching machine moves up and down to reinforce the garment piece.

[0024] When performing a loop stitch with the bobbin position tilted to the left, insert the bobbin position of the garment piece into the right-side bobbin groove 101. After the garment piece covers the eyelet on the needle plate 100, the exhaust fan is activated, and excess thread ends are sucked into the exhaust pipe 1 below the needle plate 100. The thread cutting mechanism is then activated, and the moving blade swings to the fixed blade side to cut off the excess thread ends. The thread clamping plate 7 clamps the thread end connected to the garment piece. At this time, the presser foot 200 moves the garment piece to the right by 3-5mm. Under the pressure of the presser foot 200 and guided by the inclined surface 102 on the right long side of the bobbin groove 101, the bobbin position in the bobbin groove 101 tilts to the left. At the same time, the thread end clamped under the thread clamping plate 7 is pulled tight and buried in the tilted bobbin position. Then, the presser foot 200 moves the garment piece back and forth, and the needle of the loop stitching machine moves up and down to reinforce the garment piece.

[0025] Example 2: A reverse thread cutting device based on a brother knotting machine, such as... Figure 4-7 As shown, two bone-holding grooves 101 are formed on the needle plate 100 of the brother fitting machine along the left and right swing direction of the presser foot 200 (not shown in the figure) during fitting. A tube head 6 is fixed at the middle position of the two bone-holding grooves 101 below the needle plate 100. The opening of the exhaust pipe 1 is fixed to the tube head 6. The tube head 6 extends upward from the opening end of the exhaust pipe 1 to form a boss 61. The upper end face of the boss 61 is fixed to the lower surface of the needle plate 100. The lower surface of the needle plate 100 forms a gap 62 with the opening end of the exhaust pipe 1, corresponding to the opening end of the exhaust pipe 1. A vent 103 is provided on the needle plate 100 so that the opening of the exhaust pipe 1 communicates with the bone-holding groove 101. A thread-cutting mechanism is installed near the opening of the exhaust pipe 1. The thread-cutting mechanism includes a cylinder 2 fixed below the needle plate 100, a fixed blade 3, and a movable blade 4 that rotates with the fixed blade 3. The cutting edges of the fixed blade 3 and the movable blade 4 form a shearing pair. The two ends of the connecting rod 5 are respectively rotated to the opposite end of the cutting edge of the movable blade 4 and the free end of the cylinder rod of the cylinder 2. The cutting edge of the fixed blade 3 is located within the gap 62, and the cutting edge of the movable blade 4 can enter or leave the gap 62. The lower part of the movable blade 4 abuts against a thread-clamping plate 7 that rotates with the movable blade 4.

[0026] The upper corner of the rear long side of the bone-receiving groove 101 is chamfered to form a chamfered surface 102. The width of the bone-receiving groove 101 is 2-4mm, slightly larger than the thickness of the garment piece bone, and the length is greater than the swing amplitude when the presser foot 200 is attached. The length of the thread end after the thread cutting mechanism is 5-10mm, slightly smaller than the width of the garment piece bone, so that the thread end can be completely hidden in the bent bone.

[0027] When performing the bar stitching with the bobbin position tilted, the bobbin position of the garment piece is inserted into the bobbin groove 101. After the garment piece covers the eyelet on the needle plate 100, the exhaust fan is started, and the excess thread ends are sucked into the exhaust pipe 1 under the needle plate 100. The thread cutting mechanism is then activated, and the moving blade swings to the side of the fixed blade to cut off the excess thread ends. The thread clamping plate 7 clamps the thread end connected to the garment piece. At this time, the presser foot 200 moves the garment piece backward by 3-5mm. Under the pressure of the presser foot 200 and guided by the tilted bone slope 102 on the long side of the rear of the bobbin groove 101, the bobbin position in the bobbin groove 101 tilts backward. At the same time, the thread end clamped under the thread clamping plate 7 is pulled tight and buried in the tilted bobbin position. Then the presser foot 200 moves the garment piece left and right, and the needle of the bar stitching machine moves up and down to reinforce the garment piece.

[0028] Any aspects of this invention not described in detail are existing technology or common knowledge in the field.

Claims

1. A reverse thread cutting device based on a bar knotting machine, characterized in that, On the needle plate (100) of the knotting machine, one or two bone grooves (101) are opened along the swing direction when the presser foot (200) knots. An exhaust pipe (1) is fixed below the needle plate (100) and near the bone groove (101). The opening of the exhaust pipe (1) is connected to the bone groove (101). A thread cutting mechanism is installed below the needle plate (100) and near the opening of the exhaust pipe (1).

2. The reverse thread cutting device based on a knotting machine according to claim 1, characterized in that, The upper corner of one of the long sides of the ossicular groove (101) is chamfered to form a chamfered bevel (102).

3. The reverse thread cutting device based on a knotting machine according to claim 1, characterized in that, The thread cutting mechanism includes a cylinder (2) fixed below the needle plate (100), a fixed blade (3), and a movable blade (4) that is connected to the fixed blade (3). The cutting edge of the fixed blade (3) and the cutting edge of the movable blade (4) form a cutting pair. The two ends of the connecting rod (5) are connected to the opposite end of the cutting edge of the movable blade (4) and the free end of the cylinder rod of the cylinder (2), respectively.

4. The reverse thread cutting device based on a knotting machine according to claim 3, characterized in that, A pipe head (6) is fixed at the opening of the exhaust pipe (1). The pipe head (6) extends upward from the opening end of the exhaust pipe (1) to form a boss (61). The upper end face of the boss (61) is fixed to the lower surface of the needle plate (100). The lower surface of the needle plate (100) forms a gap (62) with the opening end of the exhaust pipe (1). The cutting edge of the fixed knife (3) is located in the gap (62). The cutting edge of the moving knife (4) can enter or leave the gap (62).

5. A barbed thread cutting device based on a bar knotting machine according to claim 3, characterized in that, The lower part of the moving blade (4) abuts against the clamping plate (7) that rotates with the moving blade (4).

6. The reverse thread cutting device based on a knotting machine according to claim 1, characterized in that, The width of the bone groove (101) is 2-4mm, and its length is greater than the swing amplitude when the presser foot (200) is looped.

7. A reverse thread cutting device based on a knotting machine according to claim 1, characterized in that, The length of the wire end after the wire end cutting mechanism is 5-10mm.

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