Knife head movable type sewing machine tape cutting mechanism

Abstract

The utility model discloses a knife head movable type sewing machine cutting strip mechanism, and the upper knife assembly is provided with horizontal moving mechanism mainly with U-shaped mounting bracket, sliding rod and first fixed sleeve. The upper knife blade is installed on the horizontal moving mechanism. When cutting, the upper knife blade can be more effectively realized horizontal movement by using the upper knife blade pressing mechanism, thereby, the problem that the upper and lower knife blades are not close enough and the cutting effect is not ideal can be more effectively improved.

Description

Technical Field

[0001] This utility model relates to a sewing machine accessory, specifically a sewing machine tape cutting mechanism with a movable cutter head. Background Technology

[0002] Existing sewing machines are machines that form one or more stitches on the fabric, allowing one or more layers of fabric to interweave or sew together. In order to ensure the continuity of the sewing process, the fabric is usually sewn first and then cut to a suitable length. For example, when sewing the shoulder seam strip of a garment or the back neckline of a sweatshirt, a strip of fabric tens or hundreds of meters long is used as the seam strip. After the seam strip of each garment is sewn, it needs to be cut so that the seam strip can be sewn on the next garment.

[0003] To improve the efficiency of pressure strip cutting, existing technologies utilize automatic cutting mechanisms in industrial sewing machines, which can replace manual cutting and improve efficiency. However, in practical applications, the applicant has found that these mechanisms are not ideal, primarily due to insufficient fit between the upper and lower blades during cutting. This often results in the pressure strip not being cut completely in a single cut, requiring a second cut. Analysis reveals that the main reason is that the upper blade in existing industrial sewing machine cutting mechanisms is fixed to the upper blade holder, which lacks a horizontal movement mechanism. When the upper blade moves downwards, an anti-deviation mechanism applies a pushing force to the upper blade holder, causing a slight elastic deformation to offset the blade horizontally, thus ensuring a tighter fit between the upper and lower blades. While theoretically achievable, existing technologies present significant challenges in selecting the material for the upper blade holder. Therefore, relying solely on the elastic deformation of the upper blade holder to achieve a tight fit between the upper and lower blades is difficult to implement. Consequently, a more efficient product is urgently needed to meet market demands. Summary of the Invention

[0004] The present invention discloses a movable blade sewing machine tape cutting mechanism, wherein the upper blade can move effectively horizontally during the cutting process, so that the upper and lower blades can cooperate accurately, and can efficiently cut the sewing material, thereby improving the cutting effect and increasing processing efficiency.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a sewing machine tape-cutting mechanism with movable blade head, characterized in that: it consists of a connecting mechanism, a crank-slider mechanism, an upper blade clamping mechanism, an upper blade assembly, a lower blade assembly, and a motor; the crank-slider mechanism consists of a crank, a connecting rod, a slider, and guide rails; the crank is mounted on the output shaft of the motor; the upper end of the crank is hinged to the connecting rod, and the lower end of the connecting rod is hinged to the slider; the slider is connected to the upper blade assembly through the connecting mechanism, and each side of the slider cooperates with a guide rail; the U-shaped mounting bracket of the upper blade assembly is connected to the connecting mechanism; the U-shaped mounting bracket has a first through hole and a second through hole, which are located on both sides of the mounting area; the U-shaped mounting bracket contains... A sliding rod is installed, located in the first and second through holes respectively. A pressing block is installed at one end of the sliding rod, with the outer end face of the pressing block being a downward-facing slope. A first fixing sleeve is fixedly installed on the sliding rod, and a first spring is fitted on the sliding rod. The first spring is located between the first fixing sleeve and the U-shaped mounting bracket. A connecting post is provided at the lower part of the first fixing sleeve, and a second fixing sleeve is installed on the connecting post. The second fixing sleeve is fitted with a blade through a blade holder. The blade and the pressing block are located on opposite sides of the first fixing sleeve. The lower blade assembly is located below the upper blade assembly and has a lower blade. The blade can cooperate with the lower blade for cutting. The upper blade clamping mechanism is located on one side of the crank-slider mechanism, and the lower end of the upper blade clamping mechanism cooperates with the slope of the pressing block.

[0006] The second fixed sleeve has a second slide rail horizontally on one side, and a longitudinal adjustment groove is opened on the tool holder. The longitudinal adjustment groove cooperates with the second slide rail. A third strip hole is opened on the tool holder. The third strip hole is parallel to the second slide rail. A second fixing bolt is installed in the third strip hole. The second fixing bolt is threadedly connected to the second slide rail. A U-shaped groove is vertically opened on the upper part of the blade. A protrusion is provided on one side of the blade. A third fixing bolt is installed in the U-shaped groove. The third fixing bolt is threadedly connected to the tool holder. The protrusion is located below the second fixing bolt. The two are in contact and cooperate.

[0007] The lower blade assembly has a lower blade mounting base, which has a blind hole and a lower blade mounting groove, and the lower blade mounting groove communicates with the blind hole; the lower blade is a quadrangular prism, one end of the lower blade is installed in the lower blade mounting groove, and a fourth fixing bolt is installed in the blind hole. The fourth fixing bolt cooperates with the lower blade mounting base to clamp and fix the lower blade. One edge of the lower blade is parallel to the blade and can cooperate to achieve shearing.

[0008] It also has a reset mechanism, which has a housing. A push rod and a second spring are installed inside the housing. A push rod seat is provided on the push rod. A plug is installed on the upper part of the housing. The second spring is located between the plug and the push rod seat. The lower end of the push rod extends out of the housing. The upper blade clamping mechanism is composed of a lever and a shaft hinge. The upper end of the lever is in contact with the reset mechanism, and the lower end of the lever is in contact with the inclined surface.

[0009] A stop block is installed at the upper end of the lever, and a permanent magnet is installed inside the stop block; the stop block cooperates with the top rod.

[0010] The blade has a tip at the bottom.

[0011] A roller is installed at the lower end of the lever, and the roller engages with the inclined surface of the pressing block.

[0012] The pressing block is provided with two guide rods, which are located on both sides of the sliding rod. The U-shaped mounting bracket has two first guide holes, which slide in conjunction with the two guide rods.

[0013] The U-shaped mounting bracket is provided with a first slide rail, which is parallel to the sliding rod; the connecting mechanism has a lateral adjustment seat, on which a connecting plate is provided, and the connecting plate is fixedly connected to the slider; the lateral adjustment seat has a first strip hole and a lateral adjustment groove, the lateral adjustment groove cooperates with the first slide rail, a first fixing bolt is installed in the first strip hole, and the first fixing bolt is threadedly connected to the first slide rail.

[0014] The advantages of this invention are as follows: the upper blade assembly is equipped with a horizontal moving mechanism consisting mainly of a U-shaped mounting bracket, a sliding rod, and a first fixed sleeve. The upper blade is mounted on the horizontal moving mechanism. During shearing, the upper blade clamping mechanism can more effectively achieve horizontal movement, thereby more effectively improving the problem of insufficient close contact between the upper and lower blades and unsatisfactory shearing results. Attached Figure Description

[0015] Figure 1 This is a perspective view of the movable cutter head sewing machine tape cutting mechanism. To show the installation position of the movable cutter head sewing machine tape cutting mechanism on the industrial sewing machine, the side cover plate 7 of the sewing machine is shown in the figure. Figure 2 This is a perspective view of the tape-cutting mechanism of the movable-head sewing machine; Figure 3 This is a magnified front view of the connection structure of the connecting mechanism 1, the crank-slider mechanism 2, and the upper cutter assembly 5. Figure 4 yes Figure 3 A schematic diagram of the three-dimensional structure; Figure 5 This is a magnified front view of the upper blade assembly 5; Figure 6 yes Figure 5 A schematic diagram of the right-side view structure; Figure 7 yes Figure 5 A schematic diagram of the rear view structure; Figure 8 yes Figure 5 A schematic diagram of the three-dimensional structure; Figure 9 This is a three-dimensional structural diagram of the U-shaped mounting bracket; Figure 10This is a three-dimensional structural diagram showing the connection and cooperation of the first fixing sleeve 51, the pressing block 52, and the sliding rod 54; Figure 11 This is a three-dimensional structural schematic diagram of the lower blade assembly 6; Figure 12 This is a three-dimensional structural schematic diagram of the lower blade mounting base 60; Figure 13 This is a three-dimensional structural schematic diagram of the lower blade 63; Figure 14 This is a three-dimensional structural schematic diagram of the fourth fixing bolt 61; Figure 15 This is a three-dimensional structural schematic diagram of the reset mechanism 3.

[0016] Figure label: 1. Connecting mechanism; 10. Lateral adjustment seat; 11. Lateral adjustment groove; 12. Connecting plate; 13. First strip hole; 14. First fixing bolt. 2. Crank-slider mechanism 20. Crank 21. Second strip hole 22. Connecting rod 23. Slider 24. Guide rail 25. Slider groove 3. Reset Mechanism 30. Housing 31. Plug 32. Inner Cavity 33. Second Spring 34. Push Rod 35. Push Rod Seat 4. Upper blade clamping mechanism; 40. Lever; 41. Shaft; 42. Roller; 43. Stop block 5. Upper blade assembly 50. U-shaped mounting bracket 500. First through hole 501. First guide hole 502. Mounting area 503. Second through hole 504. First slide rail 51. First fixing sleeve 510. Connecting post 511. First positioning hole 52. Pressing block 53. Guide rod 54. Sliding rod 55. First spring 56. Blade holder 560. Longitudinal adjustment groove 561. Third strip hole 562. Second fixing bolt 57. Second fixing sleeve 570. Second slide rail 58. Blade 580. Blade tip 581. Protrusion 582. U-shaped groove 583. Third fixing bolt 6. Lower blade assembly; 60. Lower blade mounting base; 61. Third fixing bolt; 62. Blind hole; 63. Lower blade; 64. Lower blade mounting groove; 65. Needle plate. 7 side cover plates 8 motors Detailed Implementation

[0017] The determination of the up, down, left, and right directions described in this utility model is based on Figure 1 The location is determined.

[0018] The movable blade sewing machine tape-cutting mechanism described in this utility model, such as... Figure 1As shown, it consists of a connecting mechanism 1, a crank-slider mechanism 2, an upper cutter clamping mechanism 4, an upper cutter assembly 5, a lower cutter assembly 6, and a motor 8. The crank-slider mechanism 2 consists of a crank 20, a connecting rod 22, a slider 23, and guide rails 24. The crank 20 is mounted on the output shaft of the motor 8. The crank 20 is hinged to the upper end of the connecting rod 22, and the lower end of the connecting rod 22 is hinged to the slider 23. The slider 23 is connected to the upper cutter assembly 5 via the connecting mechanism 1. Each side of the slider 23 mates with a guide rail 24. The two guide rails 24 are symmetrically distributed about the slider 23. A slider groove 25 is formed between the two guide rails 24. The slider groove 25 can be an isosceles trapezoidal groove or a T-shaped groove, and the corresponding slider 23 should also have an isosceles trapezoidal or T-shaped cross-section to mate with the slider groove 25. The crank-slider mechanism 2 converts the rotational motion of the motor 8 into the reciprocating linear motion of the slider 23 along the guide rails 24. Figure 4 As shown, the U-shaped mounting bracket 50 of the upper blade assembly 5 is connected to the connecting mechanism 1. (As indicated...) Figure 9 As shown, a first through hole 500 and a second through hole 503 are provided on the U-shaped mounting bracket 50, and the first through hole 500 and the second through hole 503 are located on both sides of the mounting area 502. Figure 8 As shown, a sliding rod 54 is installed inside the U-shaped mounting bracket 50, and the sliding rod 54 is located in the first through hole 500 and the second through hole 503 respectively. The sliding rod 54 and the U-shaped mounting bracket 50 are axially slidingly fitted. A pressing block 52 is installed at one end of the sliding rod 54, and the pressing block 52 is located outside the mounting area 502. The outer end face of the pressing block 52 is a downward-facing bevel. A first fixing sleeve 51 is fixedly installed on the sliding rod 54. Figure 7 As shown, a first spring 55 is fitted onto the sliding rod 54, and the first spring 55 is located between the first fixed sleeve 51 and the U-shaped mounting bracket 50. The first spring 55 applies elastic force to the pressing block 52 through the first fixed sleeve 51. A connecting post 510 is provided at the lower part of the first fixed sleeve 51, and a second fixed sleeve 57 is installed on the connecting post 510. The second fixed sleeve 57 is equipped with a blade 58 through a blade holder 56. The blade 58 and the pressing block 52 are located on opposite sides of the first fixed sleeve 51, respectively. Figure 2 As shown, the lower blade assembly 6 is located below the upper blade assembly 5, and the lower blade assembly 6 has a lower blade 63. When the motor 8 drives the upper blade assembly 5 to move downward through the crank-slider mechanism 2, the blade 58 can cooperate with the lower blade 63 to cut. The upper blade clamping mechanism 4 is located on one side of the crank-slider mechanism 2. The upper blade clamping mechanism 4 can be a limiting rod or limiting block fixed on the side cover plate 7 of the industrial sewing machine. The end of the upper blade clamping mechanism 4 cooperates with the inclined surface of the pressing block 52.

[0019] During installation, such as Figure 1As shown, the upper blade clamping mechanism 4, motor 8, and guide rail 24 are fixedly mounted on the side cover plate 7. Typically, the upper blade clamping mechanism 4 and guide rail 24 are located on the outer side of the side cover plate 7, while the motor 8 is located on the inner side of the side cover plate 7, above the sewing machine. The blade 58 is located on the material exit side of the needle and presser foot, close to the presser foot. The lower blade assembly 6 is mounted on the needle plate 65. Connect the motor 8 to the control device and power supply; it should be able to control the switching of the motor 8.

[0020] Working principle: When the sewing material is finished and needs to be cut, a signal is given to the control device, such as by pressing or stepping on a pedal, to energize the motor 8. The motor 8 then drives the upper cutter assembly 5 downwards via the crank-slider mechanism 2. Figure 2 As shown, during the downward movement of the pressing block 52, the inclined surface of the pressing block 52 cooperates with the upper blade clamping mechanism 4. Furthermore, the force that blocks the downward movement of the pressing block 52 generated by the upper blade clamping mechanism 4 generates a horizontal component force, causing the pressing block 52 to move horizontally against the elastic force of the first spring 55. Simultaneously, the pressing block 52, through the first fixed sleeve 51, the second fixed sleeve 57, and the blade holder 56, drives the blade 58 to move horizontally a small distance, typically a few millimeters, thus achieving micro-motion of the blade 58. This ensures that the blade 58 and the lower blade 63 fit as closely as possible during the cutting process, achieving efficient cutting. Of course, through existing control circuits and program design, it is also possible to automatically drive the tape cutting mechanism after the sewing machine has finished sewing the pressure strip and the needle has stopped, achieving the technical effect of automatic tape cutting.

[0021] like Figure 8 As shown, a second slide rail 570 is horizontally provided on one side of the second fixing sleeve 57. A longitudinal adjustment groove 560 is provided on the tool holder 56, which mates with the second slide rail 570. A third slotted hole 561 is provided on the tool holder 56, which is parallel to the second slide rail 570. A second fixing bolt 562 is installed in the third slotted hole 561, and the second fixing bolt 562 is threadedly connected to the second slide rail 570. When it is necessary to adjust the longitudinal position of the blade 58, simply loosen the second fixing bolt 562, move the tool holder 56 and the second slide rail 570 relative to each other, and then retighten the second fixing bolt 562. A U-shaped groove 582 is vertically provided on the upper part of the blade 58, and a protrusion 581 is provided on one side of the blade 58. A third fixing bolt 583 is installed in the U-shaped groove 582, and the third fixing bolt 583 is threadedly connected to the tool holder 56. The protrusion 581 is located below the second fixing bolt 562, and the two are in contact and engaged. The second fixing bolt 562 can limit the blade 58.

[0022] like Figure 11As shown, the lower blade assembly 6 has a lower blade mounting base 60. The lower blade mounting base 60 has a blind hole 62 and a lower blade mounting groove 64, which communicates with the blind hole 62. The lower blade 63 is a quadrangular prism, with one end installed in the lower blade mounting groove 64. A fourth fixing bolt 61 is installed in the blind hole 62, and the fourth fixing bolt 61 cooperates with the lower blade mounting base 60 to clamp and fix the lower blade 63. The lower blade 63 is located on one side of 65. One edge of the lower blade 63 is parallel to the blade 58 and can cooperate to achieve shearing. When one edge of the lower blade 63 becomes dull, the lower blade 63 can be removed and rotated at a certain angle so that the other new edge aligns with the blade 58. Thus, a single lower blade 63 can be used by the user for several years or even more than ten years, with a long service life.

[0023] The upper blade clamping mechanism 4 can also adopt the following technical solutions: such as Figure 2 As shown, this utility model also includes a reset mechanism 3. Figure 15 As shown, the reset mechanism 3 has a housing 30, which is fixedly connected to the side cover plate 7. A push rod 34 and a second spring 33 are installed inside the inner cavity 32 of the housing 30. A push rod seat 35 is provided on the push rod 34. A plug 31 is installed on the upper part of the housing 30. The plug 31 and the housing 30 can be threaded together to facilitate maintenance or repair of the reset mechanism 3. The second spring 33 is located between the plug 31 and the push rod seat 35, providing a downward elastic force to the push rod 34. The lower end of the push rod 34 extends out of the housing 30. Figure 2 As shown, the upper blade clamping mechanism 4 can be constructed by hinged connection of lever 40 and shaft 41. The upper end of lever 40 can contact and cooperate with the push rod 34 of reset mechanism 3, and the lower end of lever 40 can contact and cooperate with the inclined surface of pressing block 52. When blade 58 moves down, pressing block 52 and the lower end of lever 40 press against each other, causing lever 40 to tend to rotate counterclockwise. However, since the upper end of lever 40 is blocked by reset mechanism 3, lever 40 can force pressing block 52 and blade 58 to move horizontally to avoid lever 40, thereby making blade 58 and lower blade 63 fit tightly during shearing, achieving efficient shearing. The upper blade clamping mechanism 4 of this structure, in cooperation with reset mechanism 3, can not only realize the horizontal micro-movement of blade 58 during shearing, but also avoid damage caused by forcibly pushing pressing block 52 and blade 58 when the horizontal movement mechanism of blade 58 is accidentally jammed.

[0024] To ensure that lever 40 remains in contact with reset mechanism 3 and to achieve timely micro-adjustment, such as Figure 2 As shown, a stop block 43 is installed at the upper end of the lever 40, and a permanent magnet is installed inside the stop block 43, thereby realizing the magnetic attraction between the stop block 43 and the top rod 34.

[0025] To make the cutting smoother, such as Figure 8 As shown, a blade tip 580 may be provided at the lower part of the blade 58.

[0026] To reduce friction between lever 40 and pressing block 52, such as Figure 2 As shown, a roller 42 is installed at the lower end of the lever 40, and the roller 42 engages with the inclined surface of the pressing block 52.

[0027] To ensure smoother axial movement of the pressing block 52, two guide rods 53 are provided on the pressing block 52. The two guide rods 53 are located on both sides of the sliding rod 54. Two first guide holes 501 are opened on the U-shaped mounting bracket 50. The two first guide holes 501 are slidably engaged with the two guide rods 53.

[0028] To achieve lateral adjustment of blade 58, such as Figure 4 As shown, the U-shaped mounting bracket 50 is provided with a first slide rail 504. (504) is parallel to the sliding rod 54 and perpendicular to the direction of the second slide rail 570. The connecting mechanism 1 has a transverse adjustment seat 10. The transverse adjustment seat 10 is provided with a connecting plate 12, which is fixedly connected to the slider 23. The transverse adjustment seat 10 has a first strip hole 13 and a transverse adjustment groove 11, which cooperates with the first slide rail 504. A first fixing bolt 14 is installed in the first strip hole 13, and the first fixing bolt 14 is threadedly connected to the first slide rail 504. When the blade 58 needs to be adjusted transversely, first loosen the first fixing bolt 14, then move the transverse adjustment seat 10 relative to the U-shaped mounting bracket 50, and finally tighten the first fixing bolt 14.

[0029] The technical solution of this utility model is not limited to the scope of the embodiments described herein. All technical contents not described in detail herein are publicly known technologies.

Claims

1. A tape-cutting mechanism for a sewing machine with a movable cutter head, characterized in that: It consists of a connecting mechanism (1), a crank-slider mechanism (2), an upper cutter clamping mechanism (4), an upper cutter assembly (5), a lower cutter assembly (6), and a motor (8); the crank-slider mechanism (2) consists of a crank (20), a connecting rod (22), a slider (23), and a guide rail (24). The crank (20) is mounted on the output shaft of the motor (8). The upper end of the crank (20) is hinged to the upper end of the connecting rod (22), and the lower end of the connecting rod (22) is hinged to the slider (23). The slider (23) is connected to the connecting mechanism (1). 1) Connected to the upper cutter assembly (5), the slider (23) is fitted with a guide rail (24) on each side; the U-shaped mounting bracket (50) of the upper cutter assembly (5) is connected to the connecting mechanism (1), the U-shaped mounting bracket (50) has a first through hole (500) and a second through hole (503), the first through hole (500) and the second through hole (503) are located on both sides of the mounting area (502), and a sliding rod (54) is installed in the U-shaped mounting bracket (50), the sliding rod (54) is located in the first through hole (500) and the second through hole (503) respectively. Inside the second through hole (503), a pressing block (52) is installed at one end of the sliding rod (54). The outer end face of the pressing block (52) is a downward-facing slope. A first fixing sleeve (51) is fixedly installed on the sliding rod (54). A first spring (55) is fitted on the sliding rod (54). The first spring (55) is located between the first fixing sleeve (51) and the U-shaped mounting bracket (50). A connecting post (510) is provided at the lower part of the first fixing sleeve (51). A second fixing sleeve is installed on the connecting post (510). (57) The second fixed sleeve (57) is fitted with a blade (58) through a blade holder (56). The blade (58) and the pressing block (52) are located on opposite sides of the first fixed sleeve (51). The lower blade assembly (6) is located below the upper blade assembly (5). The lower blade assembly (6) has a lower blade (63). The blade (58) can cooperate with the lower blade (63) to cut. The upper blade clamping mechanism (4) is located on one side of the crank slider mechanism (2). The lower end of the upper blade clamping mechanism (4) cooperates with the inclined surface of the pressing block (52).

2. The movable cutter head sewing machine tape cutting mechanism according to claim 1, characterized in that: The second fixed sleeve (57) has a second slide rail (570) horizontally on one side. The tool holder (56) has a longitudinal adjustment groove (560) that cooperates with the second slide rail (570). The tool holder (56) has a third strip hole (561) that is parallel to the second slide rail (570). The third strip hole (561) is installed in the third strip hole (561) and is threaded to the second slide rail (570). The blade (58) has a U-shaped groove (582) vertically on its upper part. The blade (58) has a protrusion (581) on one side. The U-shaped groove (582) has a third fixing bolt (583) installed in the U-shaped groove (582) and is threaded to the tool holder (56). The protrusion (581) is located below the second fixing bolt (562) and the two are in contact.

3. The movable cutter head sewing machine tape cutting mechanism according to claim 1, characterized in that: The lower blade assembly (6) has a lower blade mounting base (60), which has a blind hole (62) and a lower blade mounting groove (64). The lower blade mounting groove (64) communicates with the blind hole (62). The lower blade (63) is a quadrangular prism. One end of the lower blade (63) is installed in the lower blade mounting groove (64). The fourth fixing bolt (61) is installed in the blind hole (62). The fourth fixing bolt (61) and the lower blade mounting base (60) cooperate to clamp and fix the lower blade (63). One edge of the lower blade (63) is parallel to the blade (58) and can cooperate to achieve shearing.

4. The movable cutter head sewing machine tape cutting mechanism according to claim 1, characterized in that: It also has a reset mechanism (3), the reset mechanism (3) has a housing (30), a push rod (34) and a second spring (33) are installed in the inner cavity (32) of the housing (30), a push rod seat (35) is provided on the push rod (34), a plug (31) is installed on the upper part of the housing (30), and the second spring (33) is located between the plug (31) and the push rod seat (35); the lower end of the push rod (34) extends out of the housing (30); the upper knife clamping mechanism (4) is composed of a lever (40) and a shaft (41) hinged together, the upper end of the lever (40) is in contact with the reset mechanism (3), and the lower end of the lever (40) is in contact with the inclined surface.

5. The movable cutter head sewing machine tape cutting mechanism according to claim 4, characterized in that: A stop block (43) is installed at the upper end of the lever (40), and a permanent magnet is installed inside the stop block (43); the stop block (43) cooperates with the top rod (34).

6. The movable cutter head sewing machine tape cutting mechanism according to claim 1, characterized in that: The blade (58) has a blade tip (580) at its lower part.

7. The movable cutter head sewing machine tape cutting mechanism according to claim 4, characterized in that: The lower end of the lever (40) is fitted with a roller (42), which engages with the inclined surface of the pressing block (52).

8. The movable cutter head sewing machine tape cutting mechanism according to claim 1, characterized in that: The pressing block (52) is provided with two guide rods (53), which are located on both sides of the sliding rod (54). The U-shaped mounting bracket (50) has two first guide holes (501), which slide in cooperation with the two guide rods (53).

9. The movable cutter head sewing machine tape cutting mechanism according to claim 1, characterized in that: The U-shaped mounting bracket (50) is provided with a first slide rail (504), which is parallel to the sliding rod (54); the connecting mechanism (1) has a transverse adjustment seat (10), and a connecting plate (12) is provided on the transverse adjustment seat (10). The connecting plate (12) is fixedly connected to the slider (23); a first strip hole (13) and a transverse adjustment groove (11) are opened on the transverse adjustment seat (10). The transverse adjustment groove (11) cooperates with the first slide rail (504). A first fixing bolt (14) is installed in the first strip hole (13), and the first fixing bolt (14) is threadedly connected to the first slide rail (504).

Images