CN109267250B - Thread trimming device of sewing machine and thread trimming method thereof - Google Patents
Thread trimming device of sewing machine and thread trimming method thereof Download PDFInfo
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- CN109267250B CN109267250B CN201811347834.4A CN201811347834A CN109267250B CN 109267250 B CN109267250 B CN 109267250B CN 201811347834 A CN201811347834 A CN 201811347834A CN 109267250 B CN109267250 B CN 109267250B
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
- D05B65/006—Devices for severing the needle or lower thread with heated tools
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/02—Mechanical drives
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Abstract
The invention provides a thread trimming device of a sewing machine and a thread trimming method thereof, belonging to the technical field of sewing machines. The technical problems that the length of the residual thread end is different after the thread is cut by the existing thread cutting structure, the thread end cut is irregular, bad stitches are easily formed during seam starting and the like are solved. The thread trimming device comprises a thread dividing plate, a hot cutter and a driving mechanism for driving the thread dividing plate to rotate around the central axis of a rotating shuttle, wherein a thread dividing groove for accommodating a thread is formed in the front side surface of the thread dividing plate, and during thread trimming, the cutter head of the hot cutter can be tightly attached to the left end part of the upper side surface of the thread dividing plate. The invention adopts ultrasonic thread trimming, the cutter head can be positioned at a position closer to the needle, the residual thread end is shorter, the thickness of the thread end is not limited, and a bird nest thread ball can be prevented from being formed during the seam starting.
Description
Technical Field
The invention belongs to the technical field of sewing machines, and particularly relates to a thread trimming device and a thread trimming method of a sewing machine.
Background
The existing thread cutting structure for sewing is a movable knife and a fixed knife which are positioned below a needle plate and above a rotating shuttle, the fixed knife is fixed on a sewing machine base body, the movable knife is driven by a driving mechanism to rotate around a lower shaft, a movable knife point separates a needle thread loop to drive a sewing thread to move towards the direction of the fixed knife, and the movable knife at one side of a machine needle and the fixed knife are in high-pressure mechanical engagement to cut off the sewing thread. The stitch of the sewing machine is formed by the mutual movement of a machine needle and a rotating shuttle, the stitch can not touch a thread trimming knife edge under the condition of ensuring normal sewing, meanwhile, the movement of the machine needle and the rotating shuttle can not be influenced, a movable knife and a fixed knife are required to avoid the movement range of a movable part, the fixed knife is fixed at one side of the center of the machine needle, a certain distance is reserved between the fixed knife and the center of the machine needle, and the thread is in a tight state due to mechanical engagement thread trimming, so that the overlong and unstable residual thread head on a sewn product after thread trimming and the length of the residual thread head on one side of the machine needle are unstable, the long-time engagement friction of a blade is caused, the stability of the thread is poor, the service life is short, the thread is difficult to cut, the mechanical noise of the cutting is large, the cut thread head is hard to be pulled open under the strong pressure of a cutter, the thread. The manual thread end trimming procedure is needed to be added when long thread ends remain on the sewn product; the unstable upper thread end of length forms bad stitch (bird's nest) before sewing next time, influence the quality of the sewn product.
In order to solve the problem of the seam-starting bird nest, in the prior industry, a machine head clamps a thread end through installing a sliding thread clamping device, a blade is arranged on a presser foot, and the thread end is cut off on a presser foot knife edge through pulling the thread clamping device and a sewing material during seam starting, so that the problem of the 'bird nest' is solved. The problem of play seam bird's nest but lead to the aircraft nose to install the device additional and influence the operating space through such technical means is solved, and the presser foot band blade is not general, and thick line blade cuts constantly, and the broken end of a thread needs induced draft to collect and handles, and induced draft needs the air supply, and the presser foot secant can lead to the end of a thread to remain and influence the appearance of a series of problems such as pleasing to the eye in the sewing material openly.
Disclosure of Invention
The invention aims to provide a novel thread trimming device which can solve the problem of trimming after finishing trimming and the problem of seam bird nest.
The purpose of the invention is realized as follows:
the utility model provides a trimming device of sewing machine which characterized in that: the thread cutting machine comprises a thread separating plate, a hot cutting knife and a driving mechanism for driving the thread separating plate to rotate around a central axis of a rotating shuttle, wherein a thread separating groove for accommodating a thread is formed in the front side surface of the thread separating plate, and during thread cutting, a knife head of the hot cutting knife can be tightly attached to the left end portion of the upper side surface of the thread separating plate.
In the thread cutting device, the hot cutter can be positioned at one side of the machine needle and the needle plate and at a cutting position closer to the machine needle, so that the residual thread end of the sewing material is shorter; the thickness of the thread end of the cut suture is not limited, the parts are replaced less, larger mechanical shearing force does not exist, the friction of the blade is smaller, and the service life of the parts is longer; the cut material part realizes perfect edge sealing, prevents the loose characteristic of suture materials, can realize the function of preventing bird nest during sewing, and realizes the high-quality stable sewing of the sewing machine; the hot cutting knife is an ultrasonic cutting knife and an electric heating knife.
In the thread trimming device of the sewing machine, the rotating shuttle is provided with the thread take-off tail plate which can rotate around the central axis of the rotating shuttle, the thread take-off tail plate is positioned on the inner side of the thread separating plate, and the front side surface of the thread separating plate is positioned on the rear side of the front side surface of the thread take-off tail plate. The position relation of the thread-releasing tail plate and the thread-distributing plate is beneficial to mutually independent rotation of the thread-releasing tail plate and the thread-distributing plate, and the thread can smoothly cling to the front side surface of the thread-distributing plate when the thread is released from the thread-releasing tail plate and finally fall into the thread-distributing groove, so that the working stability is better.
In the thread trimming device of the sewing machine, the front side face of the rotating shuttle is provided with the positioning groove, the front side of the rotating shuttle is provided with the positioning hook fixedly connected with the bottom plate, the guide convex block arranged in the middle of the rear side face of the positioning hook can extend into the positioning groove, the left groove wall of the positioning groove is provided with the positioning convex block, a gap exists between the rear side face of the positioning convex block and the groove bottom of the positioning groove, and a gap exists between the right side face of the positioning convex block and the left side wall of the guide convex block.
In the thread trimming device for a sewing machine described above, the thread take-off tail plate has an arcuate guide surface whose width gradually decreases from left to right at a right end portion of a front side surface thereof. The design of the guide surface can ensure that the suture can be separated from the thread separation tail plate more smoothly.
In the thread trimming device of the sewing machine, the front end of the left groove wall of the thread dividing groove is located at the rear side of the front end of the right groove wall, and the left groove wall of the thread dividing groove gradually inclines to the left from front to back. The design of the structure of the wire distributing groove can ensure that the suture line can smoothly enter the wire distributing groove and is always positioned in the wire distributing groove in the process of clockwise rotating the wire distributing plate to return to the original position, so that the sliding is avoided, and the stability in the wire releasing process is higher.
In the thread trimming device of the sewing machine, the lower end of the hot cutter is fixedly connected with the ultrasonic amplitude transformer, and the ultrasonic amplitude transformer is connected with the ultrasonic transducer fixed on the bottom plate through the mounting bracket. Wherein be connected with the electric wire among the ultrasonic transducer, ultrasonic transducer can be with mechanical energy (ultrasonic wave) of electric energy conversion, and ultrasonic wave amplitude transformer amplifies the amplitude transmission of ultrasonic transducer output and gives the hot cutting knife, and the further amplitude that amplifies of hot cutting knife focuses on the ultrasonic wave, and the ultrasonic wave of output utilizes the cutting knife to concentrate ultrasonic energy input to by the cutting position.
In the thread trimming device of the sewing machine, the rotating shuttle is fixed at the front end part of the main shaft, the rear end part of the main shaft is connected with the first driving piece, a thread separating frame capable of rotating around the main shaft is sleeved on the main shaft at the rear side of the rotating shuttle, the rear side of the right end part of the thread separating plate is fixedly connected with the thread separating frame, and a connecting part connected with the driving mechanism is arranged on the thread separating frame.
In the thread trimming device of the sewing machine, the driving mechanism comprises a transmission shaft and a second driving piece for driving the transmission shaft to rotate, the second driving piece is connected with the rear end of the transmission shaft, the front end of the transmission shaft is fixedly connected with one end of a driving crank, the other end of the driving crank is hinged with one end of a driving connecting rod, and the other end of the driving connecting rod is hinged with a connecting part on the thread dividing frame.
In the thread trimming device of the sewing machine, the rear end of the transmission shaft is sleeved and fixed with the connecting piece, one end of the connecting piece is formed with the L-shaped driving plate, connecting rods which are respectively hinged with one end of the driving plate and the piston of the second driving piece are arranged between the other end of the driving plate and the piston of the second driving piece, the other end of the driving plate is provided with the rotatable roller, and the roller abuts against the outer side face of the cam fixed on the main shaft.
In the thread trimming device of the sewing machine, the cam is provided with the first groove and the second groove which are equal in height, and the first groove is positioned on the front side of the second groove in the anticlockwise direction.
In the thread trimming device of the sewing machine, the piston is sleeved with a return spring for driving the piston to return to the original position.
A thread trimming method using the thread trimming device is characterized in that: the method comprises the following steps:
a, off-line: the first driving piece and the second driving piece are used for controlling the wire separating tail plate and the wire distributing plate to rotate around the anticlockwise direction, and the time sequence is controlled to enable a suture between the wire separating tail plate and the positioning hook to be separated and enter a wire distributing groove of the wire distributing plate;
b, pulling a wire: the second driving piece stops driving, the distributing board resets under the combined action of the return spring and the cam, in the resetting process of the distributing board, a suture thread entering the distributing groove is pulled back along the groove on the surface of the distributing board, after the distributing board resets, a cutter head of the hot cutter is tightly attached to the left end part of the distributing board, and the suture thread is extruded between the cutter head and the upper end surface of the distributing board;
c, trimming: and starting the ultrasonic transducer to enable the cutter head of the thermal cutting knife to form high-frequency ultrasonic waves to cut off the suture.
Further, in the step a, when the sewing machine finishes sewing and thread cutting, the first driving piece drives the rotating shuttle to rotate anticlockwise, the upper thread on one side of the needle bypasses the rotating shuttle to be separated from the thread separation tail plate of the rotating shuttle, the upper thread is divided into a splayed shape by the rotating shuttle below the needle, the upper thread separated from the thread separation tail plate of the rotating shuttle is located in the positioning groove, then the second driving piece drives the separating plate to rotate anticlockwise, the front end of the separating plate penetrates through the lower side of the splayed upper thread and continues to rotate until the upper thread located in the positioning groove enters the separating groove of the separating plate, and thread separation is achieved.
Further, in the step a, when the sewing machine starts sewing, the needle drives the upper thread to pass through the sewing material and enter the lower part of the needle plate, the first driving piece drives the rotating shuttle to rotate, before the upper thread bypasses the rotating shuttle and is not separated from the thread separation tail plate of the rotating shuttle, the second driving piece drives the thread separation groove of the thread separation plate to rotate anticlockwise under the needle, then the thread separation tail plate of the rotating shuttle rotates under the needle along with the rotation of the rotating shuttle and continues to rotate anticlockwise, and when the right end of the thread separation tail plate rotates under the needle, the upper thread can be separated from the thread separation tail plate and enters the thread separation groove of the thread separation plate to realize thread separation.
Compared with the prior art, the invention has the outstanding and beneficial technical effects that:
1. in the invention, as the thermal cutting knife is used for high-frequency mechanical wave wire shearing, the thermal cutting knife with a sharp cutting edge of the cutting knife can be positioned at one side of the machine needle and one side of the needle plate and at a cutting position closer to the machine needle, and the residual thread end of sewing material is shorter; and the thickness of the thread end of the cut suture is not limited, the parts are replaced less, larger mechanical shearing force does not exist, the friction of the blade is smaller, the noise is low, and the service life of the parts is longer.
2. The invention adopts ultrasonic wave to cut, the suture thread instantly softens and melts the cutting part under the action of ultrasonic energy, perfect edge sealing can be realized on the cut material part, the characteristic of preventing the suture thread material from loosening is realized, and the high-quality stable sewing of the sewing machine is realized.
3. The invention adopts ultrasonic wave to cut, and the cutting line knife edge (ultrasonic wave) is directly controlled by a sewing machine control system, thereby realizing the bird nest prevention function in the sewing process.
Drawings
Fig. 1 is an initial state view of a thread separating plate of the thread cutting device of the present invention.
Fig. 2 is a branching state diagram of the bird's nest prevention of the thread trimming device of the present invention.
Fig. 3 is a thread-off state diagram of the bird nest prevention of the thread trimming device of the present invention.
Fig. 4 is a thread-off state diagram of the thread cutting device of the present invention.
Fig. 5 is a thread-off state diagram of the thread cutting device of the present invention.
Fig. 6 is a schematic structural view of a driving mechanism of the thread cutting device of the present invention.
Fig. 7 is a schematic structural view of a cam of the thread trimming apparatus of the present invention.
In the figure, 1, a bottom plate; 11. a main shaft; 12. a cam; 121. a first groove; 122. a second groove; 13. a wire distributing frame; 131. a connecting portion; 21. a drive shaft; 22. a second driving member; 23. a drive crank; 24. a drive link; 25. a connecting member; 26. a drive plate; 27. a connecting rod; 28. a roller; 29. a return spring; 31. a hot cutter; 32. an ultrasonic horn; 33. an ultrasonic transducer; 34. mounting a bracket; 4. a wire distributing plate; 41. a branching groove; 5. a rotating shuttle; 51. a wire-off tail plate; 511. a guide surface; 52. positioning a groove; 53. positioning the bump; 6. a positioning hook; 61. a guide projection; 7. sewing; 8. and (4) a machine needle.
Detailed Description
The invention will be further described in the following with reference to specific embodiments thereof, with reference to the accompanying drawings, in which figures 1 to 7:
the thread cutting device of the sewing machine comprises a thread separating plate 4, a hot cutting knife 31 and a driving mechanism for driving the thread separating plate 4 to rotate around the central axis of a rotating shuttle 5, wherein the knife head of the hot cutting knife 31 can be tightly attached to the left end part of the thread separating plate 4, and a thread separating groove 41 for accommodating a thread 7 is arranged on the front side surface of the thread separating plate 4. The hot cutter 31 can be positioned at one side of the needle 8 and the needle plate and at a cutting position closer to the needle 8, so that the residual thread end of the sewing material is shorter; the thickness of the thread end of the cut suture 7 is not limited, the parts are replaced a little, large mechanical shearing force does not exist, the friction of the blade is small, and the service life of the parts is long; the cut material part realizes perfect edge sealing, prevents the loose material of the sewing thread 7, can realize the function of preventing bird nest during sewing, and realizes the high-quality stable sewing of the sewing machine; the sewing thread 7 is a surface thread, and when the sewing is finished and the thread is cut, the thread cutting device can also cut the bottom thread.
As shown in fig. 1-4, a thread take-off tail plate 51 capable of rotating along with the rotating shuttle 5 is fixed on the rotating shuttle 5, the thread take-off tail plate 51 is positioned at the inner side of the thread separating plate 4, and the front side surface of the thread separating plate 4 is positioned at the rear side of the front side surface of the thread take-off tail plate 51; a positioning groove 52 is arranged on the front side surface of the rotating shuttle 5, a positioning hook 6 fixedly connected with the bottom plate 1 is arranged on the front side of the rotating shuttle 5, a guide convex block 61 arranged in the middle of the rear side surface of the positioning hook 6 can extend into the positioning groove 52, a positioning convex block 53 is arranged on the left groove wall of the positioning groove 52, a gap is formed between the rear side surface of the positioning convex block 53 and the groove bottom of the positioning groove 52, and a gap is formed between the right side surface and the left side wall of the guide convex block 61; the right end of the front surface of the thread take-off tail plate 51 has an arc-shaped guide surface 511 whose width gradually decreases from left to right. The above-mentioned position relation of the end plate 51 and the distributing plate 4 is not only beneficial to the end plate 51 and the distributing plate 4 rotating independently, but also can be smoothly attached to the front side surface of the distributing plate 4 and finally fall into the distributing groove 41 when the suture 7 is separated from the end plate 51, so the working stability is better; the design of the guide surface 511 enables the suture 7 to be more smoothly detached from the thread-detaching tail plate 51.
As shown in fig. 3, the front end of the left groove wall of the branching groove 41 is located on the rear side of the front end of the right groove wall, and the left groove wall of the branching groove 41 is gradually inclined to the left from front to rear. The design of the structure of the wire dividing groove 41 can ensure that the suture 7 smoothly enters the wire dividing groove 41 and is always positioned in the wire dividing groove 41 in the process of clockwise rotating the wire dividing plate 4 to return to the original position, so that the sliding is avoided, and the stability of the wire separating process is higher.
As shown in fig. 1 and 6, an ultrasonic horn 32 is attached to the lower end of the hot cutting blade 31, and the ultrasonic horn 32 is connected to an ultrasonic transducer 33 fixed to the base plate 1 via a mounting bracket 34. Wherein be connected with the electric wire in the ultrasonic transducer 33, ultrasonic transducer 33 can be with mechanical energy (ultrasonic wave) conversion, ultrasonic horn 32 with the amplitude amplification transmission of ultrasonic transducer 33 output for hot cutting knife 31, hot cutting knife 31 further amplifies the amplitude, the focus ultrasonic wave, output ultrasonic wave utilizes the cutting knife with ultrasonic energy concentrated input to by the cutting position.
As shown in fig. 6, the rotating shuttle 5 is fixed at the front end of the main shaft 11, the rear end of the main shaft 11 is connected with a first driving member, the main shaft 11 at the rear side of the rotating shuttle 5 is sleeved with a branching plate 4 frame 13 capable of rotating around the main shaft 11, the rear side of the right end of the branching plate 4 is fixedly connected with the branching plate 4 frame 13, and the branching plate 4 frame 13 is provided with a connecting part 131 connected with a driving mechanism; the driving mechanism comprises a transmission shaft 21 and a second driving piece 22 for driving the transmission shaft 21 to rotate, the second driving piece 22 is connected with the rear end of the transmission shaft 21, the front end of the transmission shaft 21 is fixedly connected with one end of a driving crank 23, the other end of the driving crank 23 is hinged with one end of a driving connecting rod 24, and the other end of the driving connecting rod 24 is hinged with a connecting part 131 on the branching frame; a connecting piece 25 is fixedly sleeved at the rear end of the transmission shaft 21, an L-shaped driving plate 26 is formed at one end of the connecting piece 25, connecting rods 27 which are respectively hinged with one end of the driving plate 26 and the piston of the second driving piece 22 are arranged between the other end of the driving plate 26 and the piston, a rotatable roller 28 is arranged at the other end of the driving plate 26, and the roller 28 abuts against the outer side surface of the cam 12 fixed on the main shaft 11; the cam 12 is provided with a first groove 121 and a second groove 122 with equal height, and in the counterclockwise direction, the first groove 121 is positioned at the front side of the second groove 122; the piston is sleeved with a return spring 29 for driving the piston to recover the original position; the first and second driving members 22 may be motors or cylinders
In the invention, as the thermal cutting knife 31 is used for high-frequency mechanical wave wire cutting, the thermal cutting knife 31 with a sharp cutting edge of the cutting knife can be positioned at one side of the machine needle 8 and the needle plate and at a cutting position closer to the machine needle 8, and the residual thread end of sewing material is shorter; the thickness of the thread end of the cut suture 7 is not limited, the parts are replaced less, larger mechanical shearing force does not exist, the friction of the blade is smaller, the noise is low, and the service life of the parts is longer; the ultrasonic wave is adopted for cutting, the sewing thread 7 instantly softens and melts the cutting part under the action of the ultrasonic energy, perfect edge sealing can be realized on the cutting material part, the characteristic that the sewing thread 7 is loose is prevented, and high-quality stable sewing of the sewing machine is realized.
The thread cutting method has two embodiments, in the normal sewing state, as shown in figure 1, the thread separating plate 4 is stabilized at the initial position under the action of the return spring 29, the thread separating plate 4 is positioned at one side of the needle 8, and the sewing machine sews normally.
The first embodiment:
a, off-line: when the sewing machine finishes sewing and cutting threads, a first driving part of the sewing machine drives a main shaft 11 to rotate anticlockwise, a cam 12 and a rotating shuttle 5 which are arranged on the main shaft 11 also rotate anticlockwise together, after a thread-off tail plate 51 of the rotating shuttle 5 moves to be under a needle 8, along with the continuous rotating motion of the rotating shuttle 5, a facial thread on one side of the needle 8 bypasses the rotating shuttle 5 to be separated from a thread-off tail plate 51 of the rotating shuttle 5, the facial thread is divided into a splayed shape by the rotating shuttle 5 under the needle 8, as shown in figure 4, the facial thread separated from the thread-off tail plate 51 of the rotating shuttle 5 is positioned in a positioning groove 52, then a second driving part 22 drives a connecting rod 27 to drive the driving plate 26 to swing around a transmission shaft 21 to drive the transmission shaft 21 to rotate, a roller 28 arranged on the driving plate 26 is positioned in a first groove 121 of a thread-cutting starting point of the cam 12, a driving crank 23 arranged at the front end of the transmission shaft 21 drives a driving connecting rod 24 to drive a branching plate 4 rack 13 and a branching plate 4 The central axis swings counterclockwise to one side of the needle 8, the front end of the thread separating plate 4 continues to rotate after passing through the lower side of the splayed upper thread as shown in fig. 5, until the upper thread positioned in the positioning groove 52 enters the thread separating groove 41 of the thread separating plate 4, and thread separation is realized.
B, pulling a wire: the first driving part continues to drive the main shaft 11 to rotate, the second driving part 22 stops driving, the distributing plate 4 is reset under the combined action of the reset spring 29 and the cam 12, in the resetting process of the distributing plate 4, the suture 7 entering the distributing groove 41 is pulled back along the groove on the surface of the distributing plate 4, and after the distributing plate 4 is reset, the cutter head of the hot cutting knife 31 is tightly attached to the left end part of the distributing plate 4 to clamp the suture 7;
c, trimming: the control system of the sewing machine controls the ultrasonic transducer 33 to start, so that high-frequency ultrasonic waves are formed at the cutter head of the hot cutting knife 31 to cut off the suture 7, then the power supply of the ultrasonic generator is controlled to be cut off, the cut-off shorter thread end is left on the sewing material, and finally the action of finishing the thread cutting after the sewing is finished.
The second embodiment:
a, off-line: when the sewing machine starts sewing, the needle 8 drives the upper thread to pass through the sewing material to enter the lower part of the needle plate, the first driving piece of the sewing machine drives the main shaft 11 to rotate anticlockwise, the cam 12 arranged on the main shaft 11 and the rotating shuttle 5 also rotate anticlockwise together, and before the upper thread on one side of the needle 8 bypasses the rotating shuttle 5 and is not separated from the thread-separating tail plate 51 of the rotating shuttle 5, the sewing machine control system controls the second driving piece 22 to drive the driving plate 26 to swing around the transmission shaft 21 through the connecting rod 27 in the process that the needle 8 moves upwards from the lower part of the needle plate so as to drive the transmission shaft 21 to rotate; the roller 28 installed on the driving plate 26 contacts the second groove 122 at the start point of thread cutting of the cam 12, the driving crank 23 installed at the front end of the transmission shaft 21 drives the driving link 24 to drive the thread separating plate 4 rack 13 and the thread separating plate 4 installed on the thread separating plate 4 rack 13 to swing counterclockwise around the central axis of the main shaft 11 to one side of the needle 8 to the limit position, at this time, the thread separating groove 41 of the thread separating plate 4 is located right below the needle 8, as shown in fig. 2, the sewing machine continues to move, the roller contact cam 12 rotates to the first groove 121 from the second groove 122, because the first groove 121 on the cam 12 is as high as the second groove 122, the thread separating plate 4 stays at the limit position all the time, in this process, the right end of the thread separating tail plate 51 rotates to the right below the needle 8 along with the rotation of the rotating shuttle 5, as shown in fig. 3, at this time, the upper thread can be separated from the thread separating tail plate 51 and enter the thread separating groove, and realizing off-line.
B, pulling a wire: the first driving part continues to drive the main shaft 11 to rotate, the second driving part 22 stops driving, the distributing plate 4 is reset under the combined action of the reset spring 29 and the cam 12, in the resetting process of the distributing plate 4, the suture 7 entering the distributing groove 41 is pulled back along the groove on the surface of the distributing plate 4, and after the distributing plate 4 is reset, the cutter head of the hot cutting knife 31 is tightly attached to the left end part of the distributing plate 4 to clamp the suture 7;
c, trimming: the control system of the sewing machine controls the ultrasonic transducer 33 to start, so that high-frequency ultrasonic waves are formed at the cutter head of the hot cutting knife 31 to cut off the suture 7, then the power supply of the ultrasonic generator is controlled to be cut off, the cut-off shorter thread end is left on the sewing material, and finally the action of finishing the thread cutting after sewing is finished; cutting off the end of the initial thread 7 in this way prevents the end of the thread from winding up to form a "bird's nest" coil.
The above embodiments are only preferred embodiments of the present invention, wherein the reference is made to the upper and lower parts, the left and right parts, the front and back parts, and the inside and outside parts, which are all relative to the drawings, and may be changed after rotation, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (12)
1. The utility model provides a trimming device of sewing machine which characterized in that: the thread cutting device comprises a thread separating plate (4), a hot cutting knife (31) and a driving mechanism for driving the thread separating plate (4) to rotate around the central axis of a rotating shuttle (5), wherein a thread separating groove (41) for accommodating a thread (7) is formed in the front side surface of the thread separating plate (4), and a knife head of the hot cutting knife (31) can be tightly attached to the left end part of the upper side surface of the thread separating plate (4) during thread cutting;
the rotating shuttle (5) is provided with a thread take-off tail plate (51) capable of rotating around the central axis of the rotating shuttle (5), the thread take-off tail plate (51) is positioned on the inner side of the thread separating plate (4), and the front side surface of the thread separating plate (4) is positioned on the rear side of the front side surface of the thread take-off tail plate (51);
the front side face of the rotating shuttle (5) is provided with a positioning groove (52), the front side of the rotating shuttle (5) is provided with a positioning hook (6) fixedly connected with the bottom plate (1), a guide convex block (61) arranged in the middle of the rear side face of the positioning hook (6) can extend into the positioning groove (52), a positioning convex block (53) is arranged on the left groove wall of the positioning groove (52), a gap exists between the rear side face of the positioning convex block (53) and the groove bottom of the positioning groove (52), and a gap exists between the right side face and the left side wall of the guide convex block (61).
2. The thread trimming device of a sewing machine according to claim 1, wherein: the right end part of the front side surface of the off-line tail plate (51) is provided with an arc-shaped guide surface (511) which gradually narrows from left to right.
3. The thread trimming device of a sewing machine according to claim 1, wherein: the front end of the left groove wall of the wire dividing groove (41) is positioned at the rear side of the front end of the right groove wall, and the left groove wall of the wire dividing groove (41) is gradually inclined to the left from front to back.
4. The thread trimming device of a sewing machine according to claim 1, wherein: the lower end of the hot cutting knife (31) is fixedly connected with an ultrasonic amplitude transformer (32), and the ultrasonic amplitude transformer (32) is connected with an ultrasonic transducer (33) which is fixed on the bottom plate (1) through a mounting bracket (34).
5. The thread trimmer according to any one of claims 1 to 4, wherein: the rotating shuttle (5) is fixed at the front end of the main shaft (11), the rear end of the main shaft (11) is connected with a first driving piece, a distributing frame (13) capable of rotating around the main shaft (11) is sleeved on the main shaft (11) at the rear side of the rotating shuttle (5), the rear side of the right end of the distributing plate (4) is fixedly connected with the distributing frame (13), and a connecting part (131) connected with a driving mechanism is arranged on the distributing frame (13).
6. The thread trimming apparatus for a sewing machine according to claim 5, wherein: the actuating mechanism includes transmission shaft (21) and the rotatory second driving piece (22) of drive transmission shaft (21), second driving piece (22) are connected with the rear end of transmission shaft (21), the front end of transmission shaft (21) links firmly with the one end of drive crank (23), the other end of drive crank (23) is articulated with the one end of drive connecting rod (24), the other end of drive connecting rod (24) is articulated with connecting portion (131) on the separated time frame.
7. The thread trimming device of a sewing machine according to claim 6, wherein: the rear end cover of transmission shaft (21) is established and is fixed with connecting piece (25), the one end shaping of connecting piece (25) has drive plate (26) of L style of calligraphy, be equipped with respectively between the one end of drive plate (26) and the piston of second driving piece (22) with both articulated connecting rod (27), be equipped with rotatable gyro wheel (28) on the other end of drive plate (26), gyro wheel (28) lean on with the lateral surface counterbalance of cam (12) that is fixed in on main shaft (11).
8. The thread trimming apparatus for a sewing machine according to claim 7, wherein: the cam (12) is provided with a first groove (121) and a second groove (122) which are equal in height, and the first groove (121) is located on the front side of the second groove (122) in the anticlockwise direction.
9. The thread trimming apparatus for a sewing machine according to claim 7, wherein: and the piston is sleeved with a return spring (29) for driving the piston to recover to the original position.
10. A thread cutting method using the thread cutting device according to any one of claims 1 to 9, characterized in that: the method comprises the following steps:
a, off-line: the thread-off tail plate (51) of the rotating shuttle (5) and the thread-dividing plate (4) are controlled to rotate around the anticlockwise direction by the first driving piece and the second driving piece (22), and a thread (7) between the thread-off tail plate (51) and the positioning hook (6) is separated and enters the thread-dividing groove (41) of the thread-dividing plate (4) by controlling the time sequence;
b, pulling a wire: the second driving piece (22) stops driving, the distributing plate (4) resets under the combined action of the return spring (29) and the cam (12), in the resetting process of the distributing plate (4), a suture (7) entering the distributing groove (41) is pulled back along the groove on the surface of the distributing plate (4), after the distributing plate (4) resets, a cutter head of the hot cutter (31) is tightly attached to the left end part of the distributing plate (4), and the suture (7) is extruded between the cutter head and the upper end surface of the distributing plate (4);
c, trimming: and starting the ultrasonic transducer (33) to enable the cutter head of the thermal cutting knife (31) to form high-frequency ultrasonic waves to cut off the suture (7).
11. A method of trimming a wire according to claim 10, wherein: in the step A, when the sewing machine is sewn up for trimming threads, the first driving piece drives the thread take-off tail plate (51) to rotate anticlockwise, the upper threads on one side of the machine needle (8) bypass the rotating shuttle (5) and are separated from the thread take-off tail plate (51) of the rotating shuttle (5), the upper threads are divided into a splayed shape by the rotating shuttle (5) below the machine needle (8), the upper threads separated from the thread take-off tail plate (51) of the rotating shuttle (5) are located in the positioning groove (52), then the second driving piece (22) drives the thread separating plate (4) to rotate anticlockwise, the front end of the thread separating plate (4) penetrates through the lower side of the splayed upper threads and continues to rotate until the upper threads located in the positioning groove (52) enter the thread separating groove (41) of the thread separating plate (4), and thread take-off is achieved.
12. A method of trimming a wire according to claim 10, wherein: in the step A, when a sewing machine starts sewing, the needle (8) carries an upper thread to pass through a sewing material to enter the lower part of a needle plate, the first driving piece drives the rotating shuttle (5) to rotate, before the upper thread bypasses the rotating shuttle (5) and is not separated from a thread separation tail plate (51) of the rotating shuttle (5), the second driving piece (22) drives the thread separation groove (41) of the thread separation plate (4) to rotate anticlockwise to the position under the needle (8) in one step, then the thread separation tail plate (51) of the rotating shuttle (5) rotates to the position under the needle (8) along with the rotation of the rotating shuttle (5) and continues to rotate anticlockwise, and when the right end of the thread separation tail plate (51) rotates to the position under the needle (8), the upper thread can be separated from the thread separation tail plate (51) and enters the thread separation groove (41) of the thread separation plate (4) to realize thread separation.
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| CN201811347834.4A CN109267250B (en) | 2018-11-13 | 2018-11-13 | Thread trimming device of sewing machine and thread trimming method thereof |
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| CN110042579A (en) * | 2019-05-31 | 2019-07-23 | 阮健明 | A kind of thread-trimming lifter-presser foot mechanism and sewing machine |
| CN110130012B (en) * | 2019-07-01 | 2021-03-30 | 浙江龙泰缝纫设备有限公司 | Thread cutting device of sewing machine |
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| JP2797740B2 (en) * | 1991-02-28 | 1998-09-17 | ブラザー工業株式会社 | Sewing machine thread cutting device |
| CN106283420A (en) * | 2016-10-26 | 2017-01-04 | 杰克缝纫机股份有限公司 | A kind of thread cutting method of sewing machine |
| CN106948103B (en) * | 2017-04-01 | 2019-12-17 | 杰克缝纫机股份有限公司 | Thread trimming device of sewing machine and sewing machine |
| CN108118468A (en) * | 2018-01-30 | 2018-06-05 | 强信机械科技(莱州)有限公司 | A kind of electric heating tangent line movable blade and include its sewing machine |
| CN108729046A (en) * | 2018-05-25 | 2018-11-02 | 林泽贤 | Thread cutter for sewing machine |
| CN108754902A (en) * | 2018-09-12 | 2018-11-06 | 厦门驭波超声技术有限公司 | A kind of sewing machine ultrasound cutting facility, system and method |
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Address after: 318000 no.1008, east section of Donghai Avenue, Sanjia, Jiaojiang District, Taizhou City, Zhejiang Province Patentee after: Jack Technology Co.,Ltd. Address before: 318010 No. 15 Airport South Road, Jiaojiang District, Zhejiang, Taizhou Patentee before: JACK SEWING MACHINE Co.,Ltd. |