CN109537194B - Sewing machine and automatic presser foot lifting and thread cutting control method - Google Patents
Sewing machine and automatic presser foot lifting and thread cutting control method Download PDFInfo
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- CN109537194B CN109537194B CN201811455992.1A CN201811455992A CN109537194B CN 109537194 B CN109537194 B CN 109537194B CN 201811455992 A CN201811455992 A CN 201811455992A CN 109537194 B CN109537194 B CN 109537194B
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- wire cutting
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- 238000005520 cutting process Methods 0.000 title claims abstract description 94
- 238000009958 sewing Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000007246 mechanism Effects 0.000 claims abstract description 32
- 230000009471 action Effects 0.000 claims abstract description 27
- 230000005540 biological transmission Effects 0.000 claims abstract description 22
- 230000033001 locomotion Effects 0.000 claims abstract description 11
- 238000009966 trimming Methods 0.000 claims description 11
- 230000007704 transition Effects 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 description 5
- 239000004744 fabric Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B29/00—Pressers; Presser feet
- D05B29/02—Presser-control devices
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/10—Electrical or electromagnetic drives
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The utility model belongs to the technical field of sewing equipment, in particular to a sewing machine and an automatic presser foot lifting and thread cutting control method; the thread cutting machine comprises a presser foot lifting transmission mechanism, a thread cutting transmission mechanism, a motor and a cam driven to rotate by the motor, wherein the cam comprises a presser foot lifting cam part and a thread cutting cam part, the presser foot lifting cam part comprises a presser foot lifting part and a first idle stroke part, a movement track is arranged on the front side surface of the thread cutting cam part, the movement track comprises a thread cutting part and a second idle stroke part, the presser foot lifting part and the second idle stroke part are arranged on the same side, the thread cutting part and the idle stroke part are arranged on the same side, the presser foot lifting transmission mechanism is in contact connection with the outer wall of the presser foot lifting cam part through a roller, the thread cutting transmission mechanism is arranged in the movement track and connected with the thread cutting cam part through a roller, and a first original position and a second original position are arranged on the cam; the motor can respectively perform automatic thread cutting and automatic presser foot lifting actions, has a more compact overall structure, reduces the production cost of the sewing machine and reduces the noise.
Description
Technical field:
the utility model belongs to the technical field of sewing equipment, in particular to a sewing machine and an automatic presser foot lifting and thread cutting control method.
The background technology is as follows:
at present, the sewing machine is generally provided with an automatic presser foot lifting mechanism and an automatic thread trimming mechanism, so that the actions of automatically lifting the presser foot and trimming the thread are respectively realized, the time is saved, the labor force is reduced, and the working efficiency is improved. An automatic presser foot lifting mechanism of a sewing machine disclosed in Chinese patent application with publication number of CN 203938857U, such as an automatic thread cutting device of a sewing machine disclosed in Chinese patent application with publication number of CN 102877230A, is two sets of mutually independent mechanisms, and is driven to act by two different driving sources respectively. The common driving source is an electromagnet or an air cylinder, and has the defects of complex structure, high cost, high noise during use and the like.
The utility model comprises the following steps:
the utility model aims to provide a sewing machine and a thread cutting control method for automatically lifting a presser foot, wherein the sewing machine is respectively provided with a motor for automatically cutting threads and automatically lifting the presser foot.
The utility model is realized in the following way:
one of the purposes of the utility model is to provide a sewing machine, which comprises a presser foot lifting transmission mechanism, a thread cutting transmission mechanism, a motor and a cam driven to rotate by the motor, wherein the cam comprises a presser foot lifting cam part and a thread cutting cam part, the presser foot lifting cam part comprises a presser foot lifting part and a first idle stroke part, the front side surface of the thread cutting cam part is provided with a moving track, the moving track comprises a thread cutting part and a second idle stroke part, the presser foot lifting part and the second idle stroke part are arranged on the same side, the thread cutting part and the idle stroke part are arranged on the same side, the presser foot lifting transmission mechanism is in contact connection with the outer wall of the presser foot lifting cam part through rollers, the thread cutting transmission mechanism is arranged in the moving track through rollers and is connected with the thread cutting cam part, a first original position and a second original position are arranged on the cam, and the action of the motor is controlled by a controller.
In the above sewing machine, the axes of the lifting foot portion, the idle stroke portion one and the rotating shaft of the motor are collinear, the diameter of the lifting foot portion is larger than that of the idle stroke portion one, and the lifting foot portion and the idle stroke portion one are in smooth transition.
In the sewing machine, the thread cutting part is a parabolic groove, the idle stroke part II is a circular arc groove, the circular arc groove and the parabolic groove are in a closed loop structure, and the center of the circular arc groove and the center of the opening end of the parabolic groove are both positioned on the axis of the motor rotating shaft.
In the above-mentioned sewing machine, the presser foot lifting transmission mechanism comprises a presser foot lifting small lever, the roller is arranged at one end of the presser foot lifting small lever, the other end of the presser foot lifting small lever is connected with the presser foot shaft, the front end of the presser foot shaft is connected with the presser foot through the presser foot arm, the presser foot shaft is rotatably arranged on the casing, the motor drives the cam to rotate, the roller is driven to roll on the outer side wall of the presser foot lifting cam part, and when the roller is positioned at the presser foot lifting part, the roller is further driven to rotate to realize the action of the presser foot lifting.
In the sewing machine, the shaft sleeve is sleeved on the presser foot shaft, the shaft sleeve is fixedly arranged in the machine shell, the presser foot shaft can rotate in the shaft sleeve, the neck part is arranged at one end of the shaft sleeve, a step surface is formed between the neck part and the shaft sleeve, the other end of the presser foot lifting small lever is sleeved on the neck part, the presser foot shaft is further fixedly provided with a retainer ring, the other end of the presser foot lifting small lever is limited between the step surface and the retainer ring, the retainer ring is provided with the first abutting part, the other end of the presser foot lifting small lever is provided with the second abutting part, and the presser foot lifting small lever rotates around the shaft sleeve to act on the second abutting part to drive the presser foot shaft to rotate.
In the above-mentioned sewing machine, the thread cutting transmission mechanism includes the rotating arm, the one end of rotating arm is rotated through pivot portion and is connected on the casing, the other end is connected with the one end of tangent line drive connecting rod, the other end of tangent line drive connecting rod is connected with the one end of shift fork, the middle part of shift fork is rotated through the axle position screw and is connected on the casing, the other end of shift fork is provided with fork portion, the tangent line connecting rod passes through tangent line connecting rod round pin and fork portion to be connected, and the other end and the cutter axle fixed connection of tangent line connecting rod, the cutter setting is on the cutter axle, the cutter axle rotates and sets up on the knife rest, the roller sets up on the rotating arm, the roller rolls in the motion track of cutting line cam portion and drives the rotating arm and revolute the axle portion and rotate.
In the sewing machine, the clamping spring is arranged on the cutter shaft, a spring is arranged between the clamping spring and the cutter rest, one end of the spring is tightly propped against the clamping spring, and the other end of the spring is tightly propped against the end face of the cutter rest.
In the sewing machine, the thread cutting cam part and the presser foot lifting cam part are integrated.
In the above sewing machine, the motor is a stepper motor or a grating motor.
The utility model further aims to provide an automatic presser foot lifting and trimming control method, which comprises the following steps of:
s1, judging that a cam is positioned at a first original position or a second original position by a controller;
s2, when the cam is positioned at a first original position, the controller judges that an input signal is a wire cutting or a presser foot lifting;
s3, 1) when the controller judges that the input signal is the presser foot lifting, the control cam rotates anticlockwise so that the roller contacts the cam part of the presser foot lifting to realize the action of the presser foot lifting;
2) Judging whether the motion of lifting the presser foot is finished or not by the controller, if not, keeping the cam motionless, and if so, controlling the scissor cam to rotate anticlockwise to a second original position;
3) When the controller judges that the input signal is a wire cutting, the control cam rotates clockwise to enable the roller to start the wire cutting action when the roller is positioned in the parabolic groove of the wire cutting cam part; after the thread cutting is completed, the control cam rotates clockwise to a second original position;
s4, when the cam is positioned at the second original position, the controller judges that the input signal is a wire cutting or a presser foot lifting;
s5, 1) when the controller judges that the input signal is the presser foot lifting, the control cam rotates clockwise to enable the roller to be in contact with the presser foot lifting part to realize the presser foot lifting action;
2) Judging whether the presser foot lifting action is finished or not by the controller, if not, keeping the cam motionless, and if so, controlling the cam to rotate clockwise to a first original position;
3) When the controller judges that the input signal is a wire cutting, the control cam rotates anticlockwise so that the roller is positioned in the parabolic groove of the wire cutting cam part to start the wire cutting action; after the thread cutting is completed, the control cam rotates clockwise to the first original position.
Compared with the prior art, the utility model has the outstanding advantages that:
the motor can respectively perform automatic thread trimming and automatic presser foot lifting actions, the whole structure is more compact, the production cost of the sewing machine is reduced, the noise is reduced, the performance of the sewing machine is improved, the stability of the sewing machine is improved, and the working efficiency is improved.
Description of the drawings:
FIG. 1 is one of the perspective views of the present utility model;
FIG. 2 is a second perspective view of the present utility model;
FIG. 3 is a schematic view of a cam of the present utility model;
FIG. 4 is a schematic illustration of the cam of the present utility model in a first home position;
FIG. 5 is a schematic illustration of the cam of the present utility model in a second home position;
FIG. 6 is a control process flow diagram of the present utility model;
fig. 7 is an exploded view of the presser foot lifting mechanism of the present utility model.
In the figure: 1. a motor; 2. a presser foot lifting cam part; 3. a thread cutting cam part; 4. lifting and pressing the foot part; 5. an idle stroke part I; 6. an idle stroke part II; 7. a thread cutting part; 8. a roller; 9. a roller; 10. a first home position; 11. a second home position; 12. lifting a presser foot small lever; 13. a presser foot shaft; 14. a presser foot arm; 15. a presser foot; 16. a rotating arm; 17. cutting a cutter shaft; 18. a cutter; 19. a tool holder; 20. a tangential drive link; 21. a shifting fork; 22. a tangential connecting rod; 23. tangent connecting rod pin, 24, snap spring; 25. a spring; 26. a shaft sleeve; 27. a reduced diameter portion; 28. a retainer ring; 29. an abutting part I; 30. and a second abutting part.
The specific embodiment is as follows:
the utility model is further described below with reference to the specific examples, see fig. 1-7:
one of the purposes of the utility model is to provide a sewing machine, which comprises a presser foot lifting transmission mechanism, a thread cutting transmission mechanism, a motor 1 and a cam driven by the motor 1 to rotate, wherein the motor 1 is a stepping motor or a grating motor, and the stepping motor is preferred in the embodiment. The cam comprises a presser foot lifting cam part 2 and a thread cutting cam part 3, the presser foot lifting cam part 2 comprises a presser foot lifting part 4 and a first idle stroke part 5, a movement track is arranged on the front side surface of the thread cutting cam part, the movement track comprises a thread cutting part 7 and a second idle stroke part 6, the presser foot lifting part 4 and the second idle stroke part 6 are arranged on the same side, the thread cutting part 7 and the first idle stroke part 5 are arranged on the same side, a presser foot lifting transmission mechanism is in contact connection with the outer wall of the presser foot lifting roller cam part 2 through a roller 8, the thread cutting transmission mechanism is arranged in the movement track through a roller 9 and is connected with the thread cutting cam part 3, a first original position 10 and a second original position 11 are arranged on the cam, and the roller 8 and the roller 9 are positioned on the same straight line when in the first original position 10 and the second original position 11. The action of the motor is controlled by a controller. The motor is driven, and corresponding parameters can be controlled and regulated by controlling and regulating the rotation angle of the rotating shaft of the motor, such as the control and regulation of the height of the presser foot and the control and regulation of the trimming force, so that the device is suitable for sewing cloth with different thicknesses.
Further, the axes of the foot lifting part 4, the idle stroke part I5 and the rotating shaft of the motor 1 are collinear, the diameter of the foot lifting part 4 is larger than that of the idle stroke part I5, and the foot lifting part 4 and the idle stroke part I5 are in smooth transition.
Further, the line cutting part 7 is a parabolic groove, the idle stroke part II 6 is a circular arc groove, the circular arc groove and the parabolic groove are in a closed loop structure, and the center of the circular arc groove and the center of the opening end of the parabolic groove are both positioned on the axis of the rotating shaft of the motor 1.
The utility model integrates the presser foot lifting mechanism and the thread trimming mechanism and is driven by the same motor 1, so that the structure is more compact, the assembly is convenient, the noise is reduced, and the quality is improved.
Further, the presser foot lifting transmission mechanism comprises a presser foot lifting small lever 12, the roller 8 is arranged at one end of the presser foot lifting small lever 12, the other end of the roller is connected to a presser foot shaft 13, the front end of the presser foot shaft 13 is connected with a presser foot 15 through a presser foot arm 14, the presser foot shaft 13 is rotatably arranged on the casing, the motor 1 drives the cam to rotate, the roller 8 is driven to roll on the outer side wall of the presser foot lifting cam part 2, and the action of lifting the presser foot is realized when the roller 8 is positioned at the presser foot lifting part. When the roller 8 is positioned at the vertex of the foot lifting portion, the presser foot 15 is lifted to the highest position.
Specifically, the presser foot shaft 13 is sleeved with a shaft sleeve 26, the shaft sleeve 26 is fixedly arranged in a casing, the presser foot shaft 13 can rotate in the shaft sleeve 26, one end of the shaft sleeve 26 is provided with a diameter reducing portion 27, a step surface is formed between the diameter reducing portion 27 and the shaft sleeve 26, the other end of the presser foot lifting small lever 12 is sleeved on the diameter reducing portion 27, the presser foot shaft 13 is also provided with a retaining ring 28 fixedly, the other end of the presser foot lifting small lever 12 is limited between the step surface and the retaining ring 28, the retaining ring 28 is provided with a first abutting portion 29, the other end of the presser foot lifting small lever 12 is provided with a second abutting portion 30, and the presser foot lifting small lever 12 rotates around the shaft sleeve 26 to act on the first abutting portion 29 through the second abutting portion 30 to drive the presser foot shaft 13 to rotate. When the urging force of the second abutting portion 30 is lost, the presser foot shaft 13 is reset, and the structure is compact.
The structure of the presser foot lifting transmission mechanism can also adopt:
including first connecting rod, have the rotary rod between the swing, the rotary rod passes through the pin setting on the motor mount pad, and the one end of rotary rod is articulated with the one end of first connecting rod, and the gyro wheel setting is on the other end of first connecting rod, and the other end of rotary rod is articulated with the one end of second connecting rod, and wherein the tie point of second connecting rod and rotary rod, the center of pin and the tie point of first connecting rod and rotary rod are triangle distribution, and the other end of second connecting rod is articulated with the one end of third connecting rod, and the other end of third connecting rod is connected at the presser foot epaxially.
In order to realize the reset of each component, a reset torsion spring is also arranged on the presser foot shaft, one end of the reset torsion spring is connected to the casing, and the other end is connected to the third connecting rod.
Because of the complexity of the above structure, the present embodiment preferably lifts the presser foot lever 12.
Further, the wire cutting transmission mechanism comprises a rotating arm 16, one end of the rotating arm 16 is rotationally connected to the casing through a rotating shaft part, the other end of the rotating arm is connected with one end of a wire cutting driving connecting rod 20, the other end of the wire cutting driving connecting rod 20 is connected with one end of a shifting fork 21, the middle part of the shifting fork 21 is rotationally connected to the casing through a shaft position screw, the other end of the shifting fork 21 is provided with a fork part, a wire cutting connecting rod 22 is connected with the fork part through a wire cutting connecting rod pin 23, and the other end of the wire cutting connecting rod 22 is fixedly connected with a cutter shaft 17; the cutter 18 is arranged on the cutter shaft 17, the cutter shaft 17 is rotatably arranged on the cutter rest 19, the roller 9 is arranged on the rotating arm 16, and the roller 9 rolls in the moving track of the thread cutting cam part 3 to drive the rotating arm 16 to rotate around the rotating shaft part. The cutter shaft 17 and the tangent connecting rod 22 are connected through a spline, or can be connected through a flat key or fixedly connected through a radially arranged screw.
Further, the clamping spring 24 is arranged on the cutter shaft 17, the spring 25 is arranged between the clamping spring 24 and the cutter rest 19, one end of the spring 25 is tightly propped against the clamping spring 24, the other end is tightly propped against the end face of the cutter rest 19, and the arrangement of the spring 25 can ensure that the cutter 18 and the fixed cutter maintain a tensioning state, so that the wire cutting effect is improved.
Further, the thread cutting cam part 3 and the presser foot lifting cam part 2 are integrated. Of course, the motor can also be designed into a split structure, and the split structure is respectively fixed on the rotating shafts of the motor 1 and synchronously rotates along with the rotating shafts of the motor 1. The thread trimming cam part 3 and the presser foot lifting cam part 2 are of an integrated structure, so that the structure is more compact and the installation is more convenient.
The wire cutting transmission mechanism can also adopt the following structure:
the cutting machine comprises a cutting line driving connecting rod, wherein a roller is arranged at the upper end of the cutting line driving connecting rod, the lower end of the cutting line driving connecting rod is hinged with a swinging arm, the other end of the swinging arm is fixedly connected with a cutter shaft, the middle part of the swinging arm is rotationally connected to a machine shell through a shaft position screw, and a reset torsion spring for driving each part to reset is arranged on the shaft position screw.
The utility model further aims to provide an automatic presser foot lifting and trimming control method, which comprises the following steps of:
s1, judging that a cam is positioned at a first original position 10 or a second original position 11 by a controller;
s2, when the cam is positioned at the first original position 10, the controller judges that the input signal is a wire cutting or a presser foot lifting;
s3, 1) when the controller judges that the input signal is the presser foot lifting, the control cam rotates anticlockwise so that the roller 8 contacts the presser foot lifting part positioned on the presser foot lifting cam part 2 to realize the presser foot lifting action; the height of lifting the presser foot is set according to the thickness of the cloth, and the thickness of the cloth is detected by a cloth thickness detection device, such as: the Hall sensor and the magnet respectively arranged on the presser foot arm 14 and the shell, or the height of the presser foot is controlled by the pedal, and the controller controls the rotation angle of the motor 1 according to the received signal to realize the action of lifting the presser foot 15. When the roller 8 rolls to the apex of the foot lift, the presser foot 15 is lifted up to the highest.
2) Judging whether the presser foot lifting action is finished or not by the controller, if not, keeping the cam motionless, and if so, controlling the cam to rotate anticlockwise to a second original position 11;
3) When the controller judges that the input signal is a wire cutting, the control cam rotates clockwise to enable the roller 9 to be positioned in the parabolic groove of the wire cutting cam part 3, and wire cutting action is started; after the thread cutting is completed, the control cam rotates clockwise to a second original position 11;
s4, when the cam is positioned at the second original position 11, the controller judges that the input signal is a wire cutting or a presser foot lifting;
s5, 1) when the controller judges that the input signal is the presser foot lifting, the control cam rotates clockwise to enable the roller 8 to be in contact with the presser foot lifting part 2 so as to realize the presser foot lifting action;
2) Judging whether the presser foot lifting action is finished or not by the controller, if not, keeping the cam motionless, and if so, controlling the cam to rotate clockwise to a first original position 10;
3) When the controller judges that the input signal is a wire cutting, the control cam rotates anticlockwise to enable the roller 9 to start the wire cutting action when being positioned in the parabolic groove of the wire cutting cam part 3; after the thread cutting is completed, the control cam is rotated clockwise to the first home position 10.
The presser foot lifting and thread trimming are not mutually influenced and interfered, and the normal operation of each mechanism of the sewing machine is ensured.
The above embodiment is only one of the preferred embodiments of the present utility model, and is not intended to limit the scope of the present utility model, therefore: all equivalent changes in shape, structure and principle of the utility model should be covered in the scope of protection of the utility model.
Claims (8)
1. The utility model provides a sewing machine, includes lifts presser foot drive mechanism, cuts line drive mechanism, its characterized in that: the automatic wire cutting machine is characterized by further comprising a motor (1) and a cam driven to rotate by the motor (1), wherein the cam comprises a presser foot lifting cam part (2) and a wire cutting cam part (3), the presser foot lifting cam part (2) comprises a presser foot lifting part (4) and a first idle stroke part (5), a movement track is arranged on the front side surface of the wire cutting cam part (3), the movement track comprises a wire cutting part (7) and a second idle stroke part (6), the presser foot lifting part (4) and the second idle stroke part (6) are arranged on the same side, the wire cutting part (7) and the first idle stroke part (5) are arranged on the same side, the presser foot lifting transmission mechanism is in contact connection with the outer wall of the presser foot lifting cam part (2) through a roller (8), the wire cutting transmission mechanism is arranged in the movement track and is connected with the first idle stroke part (3), a first original position (10) and a second original position (11) are arranged on the cam, and the action of the motor (1) is controlled by a controller;
the presser foot lifting transmission mechanism comprises a presser foot lifting small lever (12), a roller (8) is arranged at one end of the presser foot lifting small lever (12), the other end of the presser foot lifting small lever (12) is connected with a presser foot shaft (13), the front end of the presser foot shaft (13) is connected with a presser foot (15) through a presser foot arm (14), the presser foot shaft (13) is rotatably arranged on a machine shell, a motor (1) drives a cam to rotate so as to drive the roller (8) to roll on the outer side wall of a presser foot lifting cam part (2), and when the roller (8) is positioned at the presser foot lifting part (4), the presser foot shaft (13) is further driven to rotate so as to realize the action of the presser foot lifting (15);
the presser foot shaft (13) is sleeved with a shaft sleeve (26), the shaft sleeve (26) is fixedly arranged in a machine shell, the presser foot shaft (13) can rotate in the shaft sleeve (26), a reducing part (27) is arranged at one end of the shaft sleeve (26), a step surface is formed between the reducing part (27) and the shaft sleeve (26), the other end of the presser foot lifting small lever (12) is sleeved on the reducing part (27), a retaining ring (28) is fixedly arranged on the presser foot shaft (13), the other end of the presser foot lifting small lever (12) is limited between the step surface and the retaining ring (28), a first abutting part (29) is arranged on the retaining ring (28), a second abutting part (30) is arranged at the other end of the presser foot lifting small lever (12), and the presser foot lifting small lever (12) rotates around the shaft sleeve (26) to act on the first abutting part (29) through the second abutting part (30) to drive the presser foot shaft (13) to rotate.
2. A sewing machine as defined in claim 1, wherein: the axes of the lifting foot part (4), the idle stroke part I (5) and the rotating shaft of the motor (1) are collinear, the diameter of the lifting foot part (4) is larger than that of the idle stroke part I (5), and the lifting foot part (4) and the idle stroke part I (5) are in smooth transition.
3. A sewing machine as defined in claim 1, wherein: the line shearing part (7) is a parabolic groove, the idle stroke part II (6) is a circular arc groove, the circular arc groove and the parabolic groove are of a closed loop structure, and the center of the circular arc groove and the center of the opening end of the parabolic groove are both positioned on the axis of the rotating shaft of the motor (1).
4. A sewing machine as defined in any one of claims 1-3, wherein: the wire cutting transmission mechanism comprises a rotating arm (16), one end of the rotating arm (16) is rotationally connected to a machine shell through a rotating shaft part, the other end of the rotating arm is connected with one end of a wire cutting driving connecting rod (20), the other end of the wire cutting driving connecting rod (20) is connected with one end of a shifting fork (21), the middle part of the shifting fork (21) is rotationally connected to the machine shell through a shaft position screw, the other end of the shifting fork (21) is provided with a fork part, a wire cutting connecting rod (22) is connected with the fork part through a wire cutting connecting rod pin (23), the other end of the wire cutting connecting rod (22) is fixedly connected with a cutter shaft (17), a cutter (18) is arranged on the cutter shaft (17), the cutter shaft (17) is rotationally arranged on a cutter frame (19), a roller (9) is arranged on the rotating arm (16), and the roller (9) rolls in a moving track of the wire cutting cam part (3) to drive the rotating arm (16) to rotate around the rotating shaft part.
5. A sewing machine as defined in claim 4, wherein: the cutter shaft (17) is provided with a clamp spring (24), a spring (25) is arranged between the clamp spring (24) and the cutter rest (19), one end of the spring (25) is tightly propped against the clamp spring (24), and the other end is tightly propped against the end face of the cutter rest (19).
6. A sewing machine as defined in claim 1, wherein: the thread trimming cam part (3) and the presser foot lifting cam part (2) are of an integrated structure.
7. A sewing machine as defined in claim 1, wherein: the motor (1) is a stepping motor (1) or a grating motor (1).
8. An automatic presser foot lifting and trimming control method of a sewing machine as claimed in any one of claims 1 to 7, characterized in that: the method comprises the following steps:
s1, judging that a cam is positioned at a first original position (10) or a second original position (11) by a controller;
s2, when the cam is positioned at a first original position (10), the controller judges that an input signal is a wire cutting or a presser foot lifting;
s3, 1) when the controller judges that the input signal is the presser foot lifting, the control cam rotates anticlockwise so that the roller (8) contacts the position of the presser foot lifting cam part (2) to realize the presser foot lifting action;
2) Judging whether the presser foot lifting action is finished or not by the controller, if not, keeping the cam motionless, and if so, controlling the cam to rotate anticlockwise to a second original position (11);
3) When the controller judges that the input signal is a wire cutting, the control cam rotates clockwise to enable the roller (9) to be positioned in the parabolic groove of the wire cutting cam part (3) and start wire cutting action; after the thread cutting is completed, the control cam rotates clockwise to a second original position (11);
s4, when the cam is positioned at the second original position (11), the controller judges that the input signal is a wire cutting or a presser foot lifting;
s5, 1) when the controller judges that the input signal is the presser foot lifting, the control cam rotates clockwise to enable the roller (8) to be in contact with the presser foot lifting part to realize the presser foot lifting action;
2) Judging whether the presser foot lifting action is finished or not by the controller, if not, keeping the cam motionless, and if so, controlling the cam to rotate clockwise to a first original position (10);
3) When the controller judges that the input signal is a wire cutting, the control cam rotates anticlockwise to enable the roller to start the wire cutting action when the roller is positioned in the parabolic groove of the wire cutting cam part (3); after the thread is cut, the control cam is rotated clockwise to a first home position (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811455992.1A CN109537194B (en) | 2018-11-30 | 2018-11-30 | Sewing machine and automatic presser foot lifting and thread cutting control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811455992.1A CN109537194B (en) | 2018-11-30 | 2018-11-30 | Sewing machine and automatic presser foot lifting and thread cutting control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109537194A CN109537194A (en) | 2019-03-29 |
| CN109537194B true CN109537194B (en) | 2023-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811455992.1A Active CN109537194B (en) | 2018-11-30 | 2018-11-30 | Sewing machine and automatic presser foot lifting and thread cutting control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN111041723A (en) * | 2019-12-31 | 2020-04-21 | 浙江美机缝纫机有限公司 | Thread cutting mechanism of sewing machine |
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