Presser foot lifter for an overlock machine and overlock machine

Abstract

The utility model provides a kind of overpresser device and overlock machine of overlock machine belongs to sewing equipment technical field.Overlock machine includes casing, overpresser device includes overpresser subassembly and the motor of driving overpresser subassembly, overpresser subassembly includes presser bar, the bottom of presser bar is provided with presser arm, and it is provided with the lever one on presser bar, overpresser device further includes handle hinged on casing, handle has protruding portion capable of abutting with lever one. This overpresser device can be automatically lifted presser foot, also can manually lift presser foot, and the mode of lifting presser foot is diversified, can be selected according to need, and good adaptability.

Description

Technical Field

[0001] This utility model belongs to the field of sewing equipment technology, and relates to a presser foot lifting device for an overlock sewing machine and the overlock sewing machine itself. Background Technology

[0002] Overlock sewing machines generally include a thread-cutting mechanism, a presser foot lifting mechanism, and a differential mechanism. For example, patent document application number 202322602077.3 provides a thread-cutting mechanism, presser foot lifting mechanism, and differential mechanism for an overlock sewing machine. It includes a drive motor, a thread-cutting mechanism, a presser foot lifting mechanism, and a differential mechanism. The drive motor has a motor spindle, and the motor spindle is fixed with a drive component and a slide rod drive crank. The drive motor drives the drive component to realize the thread-cutting action of the thread-cutting mechanism. The drive motor drives the drive component to realize the presser foot lifting action of the presser foot lifting mechanism. The drive motor drives the slide rod drive crank to realize the differential adjustment action of the differential mechanism.

[0003] Existing presser foot lifting devices often use automatic methods to lift the presser foot, and cannot be lifted manually, making the method relatively simple. Summary of the Invention

[0004] This utility model addresses the aforementioned problems in the existing technology by providing a presser foot lifting device for an overlock sewing machine. The technical problem to be solved by this utility model is: how to manually lift the presser foot.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A presser foot lifting device for an overlock sewing machine, the overlock sewing machine including a machine housing, the presser foot lifting device including a presser foot lifting assembly and a motor for driving the presser foot lifting assembly, the presser foot lifting assembly including a presser foot rod, the presser foot rod having a presser foot arm at its bottom, characterized in that a lever is provided on the presser foot rod, and the presser foot lifting device further includes a handle hinged to the machine housing, the handle having a protrusion that can abut against the lever.

[0007] In this presser foot lifting device, a presser foot is provided on the presser foot arm. When the motor drives the presser foot lifting assembly to move, it can automatically lift the presser foot. When lifting the presser foot manually, the operator presses the handle. When the handle swings, the protrusion swings upward and pushes the lever, causing the presser foot rod to move upward. The presser foot rod drives the pressure plate to move upward, thus completing the lifting of the presser foot.

[0008] This presser foot lifting device can lift the presser foot automatically or manually, offering a variety of lifting methods that can be selected according to needs, making it highly adaptable.

[0009] In the presser foot lifting device of the aforementioned overlock sewing machine, the handle is hinged to the machine housing by a pin, and a torsion spring is sleeved on the pin. One end and the other end of the torsion spring are respectively connected to the machine housing.

[0010] When the handle is pressed to lift the presser foot, the torsion spring is in a torsional state. After lifting the presser foot, when the handle is released, the handle automatically returns to its original position under the action of the torsion spring, which greatly improves the convenience of operation.

[0011] In the presser foot lifting device of the overlock sewing machine described above, the presser foot lifting assembly further includes a connecting rod 1, one end of the connecting rod 1 is fixed with a connecting shaft 1, a connecting rod 2 is connected to the connecting shaft 1, the presser foot arm is connected to the connecting rod 2, a turntable is installed on the output shaft of the motor, and one side of the turntable has a shaped groove that can drive the connecting rod 1 to swing.

[0012] When the presser foot is automatically lifted, the motor drives the turntable to reverse, the pin slides in the irregular groove, the irregular groove drives the first connecting rod to swing through the pin, the first connecting rod drives the second connecting rod to swing through the first connecting shaft, the second connecting rod drives the presser foot arm to move up and down, and the presser foot moves up and down with the presser foot arm to lift the presser foot.

[0013] In the presser foot lifting device of the overlock sewing machine described above, the irregular groove includes a connected arc segment and an irregular segment. The irregular segment gradually approaches the output shaft of the motor. The distance between each point on the arc segment and the output shaft of the motor is equal. A pin is provided on the connecting rod, and the pin is slidably connected in the arc segment or the irregular segment.

[0014] When the presser foot is automatically lifted, the motor drives the turntable to reverse, and the pin begins to slide in the irregular section. The irregular section gradually moves closer to the output shaft of the motor. During the reversal of the turntable, the irregular section drives the first connecting rod to swing through the pin. The first connecting rod drives the second connecting rod to swing through the first connecting shaft. The second connecting rod drives the presser foot arm to move up and down. The presser foot moves up and down with the presser foot arm, thus lifting the presser foot.

[0015] After the presser foot is lifted, the motor drives the turntable to rotate clockwise. At this time, the pin slides out of the irregular section and enters the arc section. The distance between each point on the arc section and the motor's output shaft is equal. At this point, the connecting rod does not swing, and the wire can be cut. This structure ensures that lifting the presser foot and cutting the wire do not interfere with each other.

[0016] The presser foot lifting device of the overlock sewing machine described above also includes a tooth lifting assembly. The tooth lifting assembly includes a differential tooth frame and a swing arm. A connecting block is provided on one side of the differential tooth frame. A connecting shaft two is connected to one end of the swing arm. A connecting rod three is installed on the connecting shaft two. The connecting rod three is hinged to the bottom of the handle. The other end of the swing arm is located below the connecting block and abuts against the connecting block.

[0017] The operator presses the handle, which drives the rocker arm to swing via connecting rod three and connecting shaft two. The rocker arm then pushes the differential dental cartilage upward through the connecting block, thus lifting the dental cartilage. This structure also allows for manual lifting of the dental cartilage via the handle.

[0018] In the presser foot lifting device of the overlock sewing machine described above, a vertically extending lever 2 is provided on the connecting rod 2, the connecting shaft 2 is connected to the connecting rod 3 through a crank, and a horizontally extending lever 3 is provided at the top of the crank. The lever 2 can abut against the lever 3 and push the swing arm to swing.

[0019] When the motor drives the second connecting rod to swing, the second lever on the second connecting rod abuts against the third connecting rod and pushes the third connecting rod, causing the crank to drive the rocker arm to swing through the second connecting shaft. The rocker arm pushes the differential gear frame to move upward through the connecting block, thus completing the lifting of the gear frame. This structure achieves automatic lifting of the gear frame through the motor.

[0020] When manually lifting the dental elevator, the handle drives the lever three on the crank to move away from lever two via connecting rod three, which does not affect the structure of the automatic dental elevator.

[0021] In the presser foot lifting device of the overlock sewing machine described above, the bottom of the lever 2 has a horizontally extending connecting part 1, the connecting part 1 has a vertically extending connecting part 2, the connecting part 2 is fixed on the connecting rod 2, and the lever 3 is located outside the lever 2 and above the connecting part 1.

[0022] In the presser foot lifting device of the overlock sewing machine described above, the connecting rod three is provided with a waist-shaped groove, and the bottom of the handle is connected to a screw, which passes through the waist-shaped groove and can slide in the waist-shaped groove.

[0023] This utility model also provides an overlock sewing machine, which includes any of the above-mentioned presser foot lifting devices.

[0024] Compared with the prior art, the advantages of this utility model are as follows:

[0025] 1. This presser foot lifting device can lift the presser foot automatically or manually, offering a variety of lifting methods that can be selected according to needs, making it highly adaptable.

[0026] 2. This presser foot lifting device can also automatically lift the dental frame and manually lift the dental frame, and the two methods do not affect each other. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the presser foot lifting device installed on the machine housing;

[0028] Figure 2 This is a schematic diagram of the presser foot lifting device. Figure 1 ;

[0029] Figure 3 yes Figure 2 Enlarged view of part A in the image;

[0030] Figure 4 This is a schematic diagram of the presser foot lifting device. Figure 2 ;

[0031] Figure 5 This is a schematic diagram of the connecting rod 1 being connected to the turntable.

[0032] Figure 6 This is a diagram showing the connection structure between the handle and link three.

[0033] In the diagram: 1. Housing, 2. Motor, 3. Presser foot lifting assembly, 4. Presser foot lever, 5. Presser foot arm, 6. Lever 1, 7. Handle, 8. Protrusion, 9. Pin, 10. Torsion spring, 11. Link 1, 12. Connecting shaft 1, 13. Link 2, 14. Turntable, 15. Irregular groove, 16. Arc segment, 17. Irregular segment, 18. Pin, 19. Differential gear frame, 20. Swing arm, 21. Connecting block, 22. Connecting shaft 2, 23. Link 3, 24. Lever 2, 25. Crank, 26. Lever 3, 27. Presser foot, 28. Presser foot lifting assembly, 29. Connecting part 1, 30. Connecting part 2, 31. Waist-shaped groove, 32. Screw. Detailed Implementation

[0034] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0035] like Figure 1-3 As shown, the overlock sewing machine includes a housing 1, and the presser foot lifting device includes a presser foot lifting assembly 3 and a motor 2 for driving the presser foot lifting assembly 3. The presser foot lifting assembly 3 includes a presser foot rod 4, a presser foot arm 5 is provided at the bottom of the presser foot rod 4, and a lever 6 is provided on the presser foot rod 4. The presser foot lifting device also includes a handle 7 hinged to the housing 1, and the handle 7 has a protrusion 8 that can abut against the lever 6.

[0036] In this presser foot lifting device, a presser foot 27 is provided on the presser foot arm 5. When the motor 2 drives the presser foot lifting assembly 3 to move, the presser foot 27 can be lifted automatically. When the presser foot 27 is lifted manually, the operator presses the handle 7. When the handle 7 swings, the protrusion 8 swings upward and pushes the lever 6, causing the presser foot rod 4 to move upward. The presser foot rod 4 drives the presser foot 27 to move upward, thus completing the lifting of the presser foot 27.

[0037] This presser foot lifting device can lift the presser foot 27 automatically or manually, offering a variety of lifting methods that can be selected according to needs, making it highly adaptable.

[0038] like Figure 2 and 3 As shown, in this embodiment, the handle 7 is hinged to the housing 1 by a pin 9, and a torsion spring 10 is sleeved on the pin 9. One end and the other end of the torsion spring 10 are respectively connected to the housing 1.

[0039] When the handle 7 is pressed to lift the presser foot 27, the torsion spring 10 is in a torsional state. After lifting the presser foot 27, when the handle 7 is released, the handle 7 automatically returns to its original position under the action of the torsion spring 10, which greatly improves the convenience of operation.

[0040] like Figure 4 and 5 As shown, in this embodiment, the presser foot lifting assembly 3 also includes a connecting rod 11, one end of which is fixed with a connecting shaft 12, a connecting rod 2 13 is connected to the connecting shaft 12, a presser foot arm 5 is connected to the connecting rod 2 13, and a turntable 14 is mounted on the output shaft of the motor 2. One side of the turntable 14 has a shaped groove 15 that can drive the connecting rod 11 to swing.

[0041] When the presser foot 27 is automatically lifted, the motor 2 drives the turntable 14 to reverse, the pin 18 slides in the irregular groove 15, the irregular groove 15 drives the connecting rod 11 to swing through the pin 18, the connecting rod 11 drives the connecting rod 23 to swing through the connecting shaft 12, the connecting rod 23 drives the presser foot arm 5 to move up and down, and the presser foot 27 moves up and down with the presser foot arm 5, thus lifting the presser foot 27.

[0042] like Figure 5 As shown, in this embodiment, the irregular groove 15 includes a connected arc segment 16 and an irregular segment 17. The irregular segment 17 gradually approaches the output shaft of the motor 2. The distance between the arc segment 16 and the output shaft of the motor 2 is equal at all points. A pin 18 is provided on the connecting rod 11. The pin 18 is slidably connected in the arc segment 16 or the irregular segment 17.

[0043] When the presser foot 27 is automatically lifted, the motor 2 drives the turntable 14 to reverse, and the pin 18 begins to slide in the irregular section 17. The irregular section 17 gradually moves closer to the output shaft of the motor 2. During the reversal of the turntable 14, the irregular section 17 drives the connecting rod 11 to swing through the pin 18. The connecting rod 11 drives the connecting rod 23 to swing through the connecting shaft 12. The connecting rod 23 drives the presser foot arm 5 to move up and down. The presser foot 27 moves up and down with the presser foot arm 5, thus lifting the presser foot 27.

[0044] After the pressure foot 27 is lifted, the motor 2 drives the turntable 14 to rotate clockwise. At this time, the pin 18 slides out of the irregular section 17 and enters the arc section 16. The distance between each point on the arc section 16 and the output shaft of the motor 2 is equal. At this time, the connecting rod 11 does not swing, and the wire can be cut. This structure ensures that the pressure foot 27 and the wire cutting do not interfere with each other.

[0045] like Figure 4As shown, this embodiment also includes a tooth lifting assembly 28, which includes a differential tooth frame 19 and a rocker arm 20. A connecting block 21 is provided on one side of the differential tooth frame 19. A connecting shaft 22 is connected to one end of the rocker arm 20. A connecting rod 23 is installed on the connecting shaft 22. The connecting rod 23 is hinged to the bottom of the handle 7. The other end of the rocker arm 20 is located below the connecting block 21 and abuts against the connecting block 21.

[0046] The differential tooth holder 19 is connected to the housing 1 and can swing up and down. When the operator presses the handle 7, the handle 7 drives the swing arm 20 to swing through the connecting rod 23 and the connecting shaft 22. The swing arm 20 pushes the differential tooth holder 19 upward through the connecting block 21, thus lifting the tooth holder. This structure also allows the tooth holder to be lifted manually via the handle 7.

[0047] like Figure 6 As shown, in this embodiment, a waist-shaped groove 31 is provided on the connecting rod 3 23, and a screw 32 is connected to the bottom of the handle 7. The screw 32 passes through the waist-shaped groove 31 and can slide in the waist-shaped groove 31.

[0048] The connecting rod 33 is hinged to the handle 7 by a screw 32. The screw 32 can slide in the slot 31. When manually lifting the tooth frame, the operator presses the handle 7, and the handle 7 can still swing relative to the connecting rod 33, thus achieving manual tooth frame lifting. When automatically lifting the tooth frame, although the connecting rod 33 will also swing when the crank 25 swings, it will not push the screw 32 (at this time, the screw 32 slides relative to the slot 31) to make the handle 7 swing. This structure ensures that automatic tooth frame lifting and manual tooth frame lifting do not interfere with each other.

[0049] like Figure 4 As shown, in this embodiment, a vertically extending lever 24 is provided on the connecting rod 2 13, and the connecting shaft 2 22 is connected to the connecting rod 3 23 through the crank 25. A horizontally extending lever 3 26 is provided at the top of the crank 25, and the lever 24 can abut against the lever 3 26 and push the swing arm 20 to swing.

[0050] When motor 2 drives connecting rod 2 13 to swing, lever 24 on connecting rod 2 13 abuts against and pushes connecting rod 3 23, causing crank 25 to drive rocker arm 20 to swing through connecting shaft 2 22. Rocker arm 20 pushes differential tooth frame 19 to move upward through connecting block 21, completing tooth frame lifting. This structure achieves automatic tooth frame lifting through motor 2.

[0051] like Figure 6 As shown, in this embodiment, the bottom of the lever 24 has a horizontally extending connecting portion 29, the connecting portion 29 has a vertically extending connecting portion 30, the connecting portion 30 is fixed on the connecting rod 13, and the lever 36 is located outside the lever 24 and above the connecting portion 29.

[0052] Connector 1 29 and lever 2 24 form a clearance position, in which lever 3 26 is located. Lever 2 24 and lever 3 26 are offset from each other. When the automatic tooth holder is lifted, lever 2 24 moves toward the direction of connecting rod 3 23 and abuts against connecting rod 3 23. When the tooth holder is lifted manually, handle 7 drives lever 3 26 on crank 25 to move away from lever 2 24 through connecting rod 3 23. Lever 2 24 and lever 3 26 do not contact each other and do not interfere with the structure of the automatic tooth holder, and do not affect each other.

[0053] This utility model also provides an overlock sewing machine, which includes any of the above-mentioned presser foot lifting devices.

[0054] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A presser foot lifting device for an overlock sewing machine, the overlock sewing machine comprising a machine housing (1), the presser foot lifting device comprising a presser foot lifting assembly (3) and a motor (2) for driving the presser foot lifting assembly (3), the presser foot lifting assembly (3) comprising a presser foot rod (4), and a presser foot arm (5) disposed at the bottom of the presser foot rod (4), characterized in that, The presser foot rod (4) is provided with a lever (6), and the presser foot lifting device also includes a handle (7) hinged to the housing (1), and the handle (7) has a protrusion (8) that can abut against the lever (6).

2. The presser foot lifting device of an overlock sewing machine according to claim 1, characterized in that, The handle (7) is hinged to the housing (1) by a pin (9), and a torsion spring (10) is sleeved on the pin (9). One end of the torsion spring (10) and the other end are respectively connected to the housing (1).

3. The presser foot lifting device of an overlock sewing machine according to claim 1 or 2, characterized in that, The lifting foot assembly (3) also includes a connecting rod (11), one end of which is fixed with a connecting shaft (12), a connecting rod (13) is connected to the connecting shaft (12), the pressing foot arm (5) is connected to the connecting rod (13), and a turntable (14) is installed on the output shaft of the motor (2). One side of the turntable (14) has a shaped groove (15) that can drive the connecting rod (11) to swing.

4. The presser foot lifting device of an overlock sewing machine according to claim 3, characterized in that, The irregular groove (15) includes a connected arc segment (16) and an irregular segment (17). The irregular segment (17) gradually approaches the output shaft of the motor (2). The distance between the arc segment (16) and the output shaft of the motor (2) is equal at all points. A pin (18) is provided on the connecting rod (11). The pin (18) is slidably connected in the arc segment (16) or the irregular segment (17).

5. The presser foot lifting device of an overlock sewing machine according to claim 3, characterized in that, It also includes a tooth lifting assembly (28), which includes a differential tooth frame (19) and a rocker arm (20). A connecting block (21) is provided on one side of the differential tooth frame (19). A connecting shaft (22) is connected to one end of the rocker arm (20). A connecting rod (23) is installed on the connecting shaft (22). The connecting rod (23) is hinged to the bottom of the handle (7). The other end of the rocker arm (20) is located below the connecting block (21) and abuts against the connecting block (21).

6. The presser foot lifting device of an overlock sewing machine according to claim 5, characterized in that, The connecting rod 2 (13) is provided with a vertically extending lever 2 (24). The connecting shaft 2 (22) is connected to the connecting rod 3 (23) through a crank (25). The top of the crank (25) is provided with a horizontally extending lever 3 (26). The lever 2 (24) can abut against the lever 3 (26) and push the swing arm (20) to swing.

7. The presser foot lifting device of an overlock sewing machine according to claim 6, characterized in that, The bottom of the lever 2 (24) has a horizontally extending connecting part 1 (29), the connecting part 1 (29) has a vertically extending connecting part 2 (30), the connecting part 2 (30) is fixed on the connecting rod 2 (13), and the lever 3 (26) is located outside the lever 2 (24) and above the connecting part 1 (29).

8. The presser foot lifting device of an overlock sewing machine according to claim 6, characterized in that, The connecting rod 3 (23) is provided with a waist-shaped groove (31), and the bottom of the handle (7) is connected with a screw (32). The screw (32) passes through the waist-shaped groove (31) and can slide in the waist-shaped groove (31).

9. An overlock sewing machine, characterized in that, The overlock sewing machine includes a presser foot lifting device as described in any one of claims 1-8.

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