WO2022222487A1 - 缝纫机及其剪线装置和剪线控制方法 - Google Patents

缝纫机及其剪线装置和剪线控制方法 Download PDF

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Publication number
WO2022222487A1
WO2022222487A1 PCT/CN2021/135969 CN2021135969W WO2022222487A1 WO 2022222487 A1 WO2022222487 A1 WO 2022222487A1 CN 2021135969 W CN2021135969 W CN 2021135969W WO 2022222487 A1 WO2022222487 A1 WO 2022222487A1
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WIPO (PCT)
Prior art keywords
thread trimming
motor
crank
sewing machine
thread
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Application number
PCT/CN2021/135969
Other languages
English (en)
French (fr)
Inventor
郏彬辉
祝书伟
柯祥林
高东
Original Assignee
杰克科技股份有限公司
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Application filed by 杰克科技股份有限公司 filed Critical 杰克科技股份有限公司
Publication of WO2022222487A1 publication Critical patent/WO2022222487A1/zh

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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D05B65/02—Devices for severing the needle or lower thread controlled by the sewing mechanisms
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/66—Disintegrating fibre-containing textile articles to obtain fibres for re-use

Definitions

  • the invention relates to the technical field of sewing machines, in particular to a thread trimming device for a sewing machine, a sewing machine including the thread trimming device, and a thread trimming control method for the sewing machine.
  • the basic mechanism for realizing the purpose of sewing is the needle bar mechanism, the thread hooking mechanism, the thread take-up mechanism and the feeding mechanism. These four mechanisms are all driven by the rotation of the main shaft.
  • the purpose of thread trimming is the thread trimming mechanism.
  • the middle and high-end lockstitch machines on the market all use the stepper motor to drive the thread trimming mechanism to complete the thread trimming action. User's sewing experience.
  • the utility model patent with the publication number CN205088427U discloses a thread trimming and presser foot lifting device of a sewing machine, and specifically discloses that the motor drives the thread trimming mechanism through a cam assembly, and the cam assembly includes a thread trimming crank and a cutter driving crank.
  • the knife driving crank is installed on one end shaft of the motor, the thread tangent crank is connected with the thread trimming handle, the thread trimming crank and the cutter driving crank are eccentrically connected, and the motor drives the cutter driving crank to rotate, and the thread trimming mechanism is driven by the thread trimming crank to perform the thread trimming action;
  • the cutter driving crank is provided with a roller sleeved by a roller shaft, the tangent crank is provided with a groove, and the roller can rotate in the groove along with the cutter driving crank and drive the tangent crank.
  • the motor drives the cam (tangent crank) to rotate through the roller (roller) installed on the cutter driving crank to force the thread trimming mechanism to complete the thread trimming action or reset.
  • the speed needs to be defined multiple times according to the cam arc surface during the motor rotation process.
  • the motor speed cannot be defined by a simple function, so it can only be used in a fixed
  • the technical problem to be solved by the present invention is to provide a thread trimming device of a sewing machine, which will not cause noise caused by jumping due to excessive thread trimming speed, so as to overcome the above-mentioned defects of the prior art.
  • the present invention adopts the following technical solutions:
  • the invention provides a thread trimming device of a sewing machine, comprising a motor, a driving crank driven by the motor to rotate, a roller arranged on the driving crank, and a long crank connected with the thread trimming mechanism.
  • the long crank includes a driving part and a limiter
  • the driving part has a trimming contour surface matched with the roller, the trimming contour surface includes a trimming segment driven by the roller to drive the trimming mechanism to perform the trimming action, and the limiting part has an inner side, the inner side and the trimming segment.
  • a track groove is formed by the spaced relative arrangement, and the roller moves along the track groove when passing through the trimming segment.
  • the inner side surfaces are parallel to the trimmer line segment and both are in contact with the outer peripheral surface of the roller.
  • the limiting portion further has a connecting surface, and the connecting surface connects the inner side surface and the trimming segment to form a U-shaped groove.
  • the trimming contour surface further includes a base circle segment connected with the trimmer segment, and the base circle segment is concentric with the rotation center of the driving crank.
  • the thread trimming mechanism includes a rotatable thread trimmer shaft and a thread trimmer assembly connected to one end of the thread trimmer shaft, and a long crank is provided at the other end of the thread trimmer shaft.
  • the thread trimming assembly includes a thread trimming crank, a thread trimming link, a moving knife crank, a moving knife and a fixed knife, one end of the thread trimming crank is mounted on the thread trimming shaft, and the other end is hinged with one end of the thread trimming link, The other end of the thread trimming link is hinged with one end of the crank of the movable knife, the movable knife is installed on the other end of the crank of the movable knife, and the fixed knife is installed on the bottom plate of the sewing machine.
  • the thread trimming mechanism further includes a shaft sleeve mounted on the bottom plate of the sewing machine and a torsion spring sleeved on the shaft sleeve, the thread trimming shaft is passed through the shaft sleeve, and both ends of the torsion spring are respectively abutted against the bottom plate and the thread trimmer assembly superior.
  • the present invention also provides a sewing machine, including the thread trimming device of the sewing machine as described above.
  • the present invention also provides a thread trimming control method for a sewing machine, which adopts the thread trimming device of the sewing machine as described above.
  • the main shaft of the sewing machine rotates from the main shaft angle A to the main shaft angle C at the main shaft speed n, and the motor is in the thread trimming interval. It rotates from the motor zero position to the motor angle a at the first motor speed n 1 and rotates from the motor angle a to the motor angle b at the second motor speed n 2 , and the rollers on the driving crank are driven by the motor along the long crank.
  • the motor rotates from the motor angle b to the motor zero position at the third motor speed n 3 in the thread trimming interval, so that the thread trimming mechanism and the long crank act together in the torsion spring and the motor.
  • n 3 ⁇ n 4 , n 4 is the rotation speed of the long crank when the thread trimming mechanism and the long crank are reset under the independent action of the torsion spring.
  • the limiter on the long crank acts as a limit for the movement of the roller when it passes through the wire trimming section on the long crank, so that the roller moves along the track groove on the long crank when the wire is trimmed, which is a closed structure.
  • noise will be generated due to the hard contact between the roller and the track surface, or the noise will be caused by throwing and jumping due to the thread trimming speed being too fast, so there is no need to reduce the thread trimming speed to reduce noise. Therefore, the present invention can realize the faster thread trimming speed matched with the main shaft speed of the sewing machine and the synchronous adjustment of the thread trimming speed matching the main shaft speed, and at the same time meet the requirements of low thread trimming sound and good thread trimming stability.
  • FIG. 1 is a schematic structural diagram of a thread trimming device of a sewing machine according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of the cooperation between the roller on the driving crank and the long crank in the thread trimming device of the sewing machine according to the embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a thread trimming device of a sewing machine according to an embodiment of the present invention equipped with a presser foot lifting mechanism.
  • FIG. 4 is a schematic structural diagram of a presser foot lifting cam of the presser foot lifting mechanism in FIG. 3 .
  • FIG. 5 is a schematic structural diagram of the presser foot of the presser foot lifting mechanism in FIG. 3 .
  • FIG. 6 is a schematic time sequence diagram of a thread trimming control method of a sewing machine according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of the corresponding relationship between the motor angle and the main shaft angle in the thread trimming control method of the sewing machine according to the embodiment of the present invention.
  • FIG. 8 is a schematic diagram of the thread trimming control logic of the thread trimming control method of the sewing machine according to the embodiment of the present invention.
  • FIG. 9 is a schematic time sequence diagram when the thread trimming control method of the sewing machine according to the embodiment of the present invention includes the presser foot lifting control.
  • FIG. 10 is a schematic diagram of the control logic of the presser foot lifter when the thread trimming control method of the sewing machine according to the embodiment of the present invention includes the presser foot lifter control.
  • Thread trimming mechanism 51 Thread trimming shaft
  • the terms “installed”, “connected” and “connected” should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements.
  • installed should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements.
  • FIG. 1 to Fig. 10 an embodiment of the thread trimming device of the sewing machine of the present invention is shown.
  • the thread trimming device of the sewing machine of this embodiment includes a motor 1 , a driving crank 2 , a roller 3 , a long crank 4 and a thread trimming mechanism 5 .
  • the motor 1 can be fixedly installed on the bottom plate of the sewing machine through the motor bracket 11 .
  • the motor 1 has a rotating shaft 10, one end of the driving crank 2 is fixedly mounted on the rotating shaft 10 of the motor 1, the driving crank 2 is driven by the rotating shaft 10 of the motor 1 and rotates synchronously with the rotating shaft 10 of the motor 1, and the rotation center of the driving crank 2 is the motor 1
  • the axis of the shaft 10 Preferably, the motor 1 adopts a stepping motor, which can precisely control the rotation speed and rotation angle of the rotating shaft 10 .
  • the roller 3 is arranged at the other end of the driving crank 2 , and the driving crank 2 rotates the roller 3 to rotate synchronously, so the rotation center of the roller 3 is also the axis of the rotating shaft 10 of the motor 1 .
  • the roller 3 can be rotatably mounted on the drive crank 2 through a pin shaft.
  • the long crank 4 is connected with the thread trimming mechanism 5 .
  • the long crank 4 includes a driving part 41 and a limiting part 42 .
  • the driving part 41 has a thread trimming contour surface 410 matched with the roller 3.
  • the thread trimming contour surface 410 includes a thread trimming segment 4101 driven by the roller 3 to drive the thread trimming mechanism 5 to perform the thread trimming action.
  • the roller 3 When driving the driving crank 2 and the roller 3 to rotate, the roller 3 acts on the trimming segment 4101 of the trimming contour surface 410 of the driving part 41 of the long crank 4 and moves along the trimming segment 4101, which can drive the long crank 4 to rotate, and the long crank 4
  • the rotation drives the thread trimming mechanism 5 to perform thread trimming action.
  • the limiting portion 42 has an inner side surface 420 .
  • the inner side surface 420 of the limiting portion 42 and the trimming segment 4101 of the trimming contour surface 410 of the driving portion 41 are spaced opposite to each other to form a track groove 43 , and the roller 3 follows the track when passing through the trimming segment 4101 .
  • the groove 43 moves.
  • the movement of the roller 3 passing through the thread trimming section 4101 is limited by the limiting portion 42, so that the roller 3 moves along the track groove 43 on the long crank 4 when the thread trimming is performed, which is a closed structure.
  • the thread trimming device of the sewing machine of the present embodiment can achieve a faster thread trimming speed matching the rotation speed of the main shaft of the sewing machine and synchronous adjustment of the thread trimming speed matching the rotation speed of the main shaft, and at the same time meet the requirements of low thread trimming sound and good thread trimming stability.
  • the inner side surface 420 of the limiting portion 42 of the long crank 4 is parallel to the trimming segment 4101 of the trimming contour surface 410 of the driving portion 41 and both are in contact with the outer peripheral surface of the roller 3 , that is, When the roller 3 moves along the track groove 43, it keeps in contact with the inner side surface 420 of the limiting part 42 and the trimming segment 4101 of the trimming contour surface 410 of the driving part 41, thereby ensuring that the roller 3 does not move in the track groove 43 without being in contact with each other. Collision or throwing can produce noise.
  • the limiting portion 42 of the long crank 4 also has a connecting surface 421, and the connecting surface 421 connects the inner side surface 420 of the limiting portion 42 and the trimming segment 4101 of the trimming contour surface 410 of the driving portion 41 to form a U-shape
  • the groove that is, the track groove 43 is a U-shaped groove with one end closed, and the connecting surface 421 connects the trimming segment 4101 and the inner side surface 420 at the trimming end of the trimming segment 4101.
  • the open end of the groove enters the U-shaped groove and moves along the U-shaped groove to the closed end of the U-shaped groove, that is, it reaches the end of the wire-cutting segment 4101, and the wire-cutting mechanism 5 is driven to complete the wire-cutting action.
  • the roller 3 is also in a closed structure, that is, the U-shaped track groove 43 makes the roller 3 move in the closed structure when the thread trimming is performed and when the thread trimming is reset, which can further ensure that no accident occurs.
  • the thread trimming speed is too fast to cause jumping and noise.
  • the thread trimming mechanism 5 may include a thread trimmer shaft 51 and a thread trimmer assembly, the thread trimmer shaft 51 is rotatably supported on the bottom plate of the sewing machine, and the thread trimmer assembly is connected to one end of the thread trimmer shaft 51 , the long crank 4 is arranged on the other end of the thread trimming shaft 51 .
  • the long crank 4 and the thread trimming shaft 51 can be separate structures, and the long crank 4 is fixedly installed on the other end of the thread trimming shaft 51; the long crank 4 and the thread trimming shaft 51 can also be an integral structure.
  • the roller 3 acts on the trimming segment 4101 of the trimming contour surface 410 of the driving part 41 of the long crank 4 to drive the long crank 4 to rotate
  • the rotation of the long crank 4 drives the thread trimming shaft 51 to rotate accordingly
  • the rotation of the thread trimming shaft 51 drives the thread trimming shaft 51 to rotate.
  • the thread trimming component performs the thread trimming action.
  • the structure of the thread trimming assembly is not limited, and any thread trimming assembly structure in the prior art that can perform the thread trimming action under the driving of the thread trimming shaft 51 can be used.
  • the thread trimming assembly may include a thread trimming crank 52 , a thread trimming connecting rod 53 , a moving knife crank 54 , a moving knife 55 and a stationary knife 56 , and one end of the thread trimming crank 52 is fixedly mounted on the thread trimming shaft 51 .
  • the other end of the thread trimming crank 52 is hinged with one end of the thread trimming link 53
  • the other end of the thread trimming link 53 is hinged with one end of the moving knife crank 54
  • the moving knife 55 is fixedly installed on the other end of the moving knife crank 54
  • the fixed knife 56 is fixedly installed on the bottom plate of the sewing machine
  • the movable knife crank (54) is provided with a fixed rotation center.
  • the thread trimming crank 52 When the thread trimming shaft 51 rotates, the thread trimming crank 52 is driven to rotate accordingly, the thread trimming crank 52 drives the thread trimming link 53 and the moving knife crank 54 to rotate, and the moving knife crank 54 moves the moving knife 55 toward the fixed knife 56, During the movement of the movable knife 55 toward the fixed knife 56, the suture to be cut is first hooked and moved with the suture toward the fixed knife 56 to complete the line splitting, and then the moving knife 55 continues to move toward the fixed knife 56 with the suture to reach the same distance with the fixed knife 56. The suture is cut by occlusal, and the thread trimming is completed.
  • the thread trimming mechanism 5 of this embodiment also includes a shaft sleeve 57 and a torsion spring 58.
  • the shaft sleeve 57 is fixedly installed on the bottom plate of the sewing machine, the torsion spring 58 is sleeved on the shaft sleeve 57, and the thread trimming shaft 51 is rotatably passed through.
  • the two ends of the torsion spring 58 are respectively abutted on the bottom plate of the sewing machine and the thread trimming crank 52 of the thread trimming assembly.
  • the torsion spring 58 can drive the thread trimming mechanism 5 and the long crank 4 to reversely reset after the thread trimming mechanism 5 completes the thread trimming action.
  • the trimming contour surface 410 of the driving part 41 of the long crank 4 may further include a base circle segment 4102, one end of the trimming segment 4101 is the end of the trimming line, and the base circle segment 4102 is connected with the trimming segment The other end of 4101 is connected, the base circle segment 4102 is an arc segment, and the base circle segment 4102 is concentric with the rotation center of the drive crank 2, so the roller 3 rotates synchronously with the drive crank 2 and moves along the base circle segment 4102 At this time, the long crank 4 will not be driven to rotate. At this time, the long crank 4 will perform an idle stroke, and the thread trimming mechanism 5 will not act.
  • the base circle segment 4102 can leave idle travel of the thread trimmer 5 for other actuators driven by the motor 1 (eg, presser foot lifting mechanism, tooth height adjustment mechanism, etc.), so as to realize multiple functions driven by one motor 1 .
  • the motor 1 can be a dual output shaft motor
  • the driving crank 2 is arranged on the rotating shaft on one side of the dual output shaft motor
  • the other actuators are arranged on the rotating shaft on the other side of the dual output shaft motor.
  • the motor 1 is a dual output shaft motor
  • the driving crank 2 is fixedly installed on the rotating shaft 10 on one side of the motor 1
  • the other side of the motor 1 A presser foot lifter cam 6 , a presser foot lifter roller 7 , a presser foot lifter driving crank 8 and a presser foot lifter mechanism 9 are arranged.
  • the presser foot lifting cam 6 is fixedly installed on the rotating shaft 10 on the other side of the motor 1.
  • the presser foot lifting cam 6 is driven by the rotating shaft 10 of the motor 1 to rotate synchronously with the rotating shaft 10 of the motor 1, and the rotation center of the presser foot lifting cam 6 is the motor.
  • the presser foot-lifting roller 7 is arranged at one end of the presser-foot-lifting driving crank 8 .
  • the presser-foot-lifting roller 7 can be rotatably mounted on the presser foot-lifting driving crank 8 through a pin shaft.
  • the other end of the presser foot lifter driving crank 8 is connected with the presser foot lifter mechanism 9 .
  • the presser foot lifter cam 6 has a presser foot lifter profile surface 60 matched with the presser foot lifter roller 7 , and the presser foot lifter roller 7 presses against the presser foot lifter profile surface 60 .
  • the contour surface 60 of the lifter foot includes a base circle segment 601, an execution segment 602 and a height maintaining segment 603 connected in sequence.
  • the rotation center of the presser foot cam 6 is a circular arc segment, and the presser foot lifter execution segment 602 is connected to the presser foot lifter base circular segment 601 and the presser foot height maintaining segment 603, and the presser foot lifter execution segment 602 is separated from the presser foot lifter cam 6.
  • the distance from the center of rotation increases gradually.
  • the presser foot lifter cam 6 rotates with the rotating shaft 10 of the motor 1 and the presser foot lifter roller 7 moves along the presser foot lifter base circle segment 601 of the presser foot lifter cam 6 without driving the presser foot lifter drive crank 8 to rotate, so that the The presser foot lifter mechanism 9 performs an idle stroke, and the presser foot lifter mechanism 9 does not act.
  • the rotating shaft 10 of the motor 1 continues to rotate, and the roller 3 moves along the base circle segment 4102 of the thread trimming contour surface 410 of the driving part 41 of the long crank 4, so that the long crank 4 performs an idle stroke, and the thread trimming mechanism 5 No action, the presser foot lifter 7 enters the presser foot lifter execution section 602 from the presser foot lifter base circle segment 601 of the presser foot lifter cam 6 and moves along the presser foot lifter execution section 602, and is driven by the presser foot lifter execution section 602 to lift.
  • the presser foot roller 7 drives the presser foot lifter driving crank 8 to rotate, and the rotation of the presser foot lifter driving crank 8 drives the presser foot lifter mechanism 9 to perform the presser foot lifting action.
  • presser foot lifter roller 7 moves along the presser foot lift execution section 602 to the intersection of the presser foot lift execution section 602 and the presser foot height maintaining section 603, the presser foot is lifted to the highest height position, the presser foot lift is completed, and the motor 1.
  • the rotary shaft 10 continues to rotate, and the presser foot lifter roller 7 enters the presser foot height maintaining section 603 and moves along the presser foot height maintaining section 603 without driving the presser foot lifter drive crank 8 to rotate, so that the presser foot lifter mechanism 9 does not act. At this time, the presser foot is kept at the highest height position.
  • the presser foot lifter mechanism 9 may include a presser foot lifter crank shaft 91, a presser foot lifter bushing 92, a presser foot lifter lower crank 93, a top rod 94, a rear lever 95, a pull rod 96, a front lever 97, a pull block 98 and Stop 99.
  • the presser foot-lifting shaft sleeve 92 is fixedly installed on the bottom plate of the sewing machine, and the presser-foot-lifting crankshaft 91 is rotatably passed through the presser foot-lifting shaft sleeve 92 .
  • the presser foot lifter roller 7 is disposed at one end of the presser foot lifter driving crank 8 , and the other end of the presser foot lifter driving crank 8 is fixed at one end of the presser foot lifter crank shaft 91 .
  • One end of the lower presser foot lifter crank 93 is fixed on the other end of the presser foot lifter crank shaft 91 , the other end of the lower presser foot lifter crank 93 is hinged with one end of the ejector rod 94 , and the other end of the ejector rod 94 is connected with one end of the rear lever 95 .
  • the rear lever 95 is rotatably hinged on the casing of the sewing machine.
  • the front lever 97 is rotatably hinged on the casing of the sewing machine.
  • the stopper 99 is mounted on the upper end of the presser foot rod 101
  • the presser foot assembly 102 is mounted on the lower end of the presser foot rod 101 .
  • the presser foot lifter roller 7 moves along the presser foot lifter execution section 602 of the presser foot lifter cam 6, and the presser foot lifter execution section 602 drives the presser foot lifter roller 7 to drive the presser foot lifter drive crank 8 to rotate, it is driven by the presser foot lifter.
  • the rotation of the crank 8 can drive the presser foot crank shaft 91 and the presser foot lower crank 93 to rotate synchronously, and the rotation of the presser foot lower crank 93 drives the top rod 94, the rear lever 95, the pull rod 96, the front lever 97 and the pull block 98 to move.
  • the pull block 98 lifts the stop block 99 to rise, thereby driving the presser foot rod 101 and the presser foot assembly 102 to rise to realize the action of lifting the presser foot.
  • a presser foot spring 103 can be sleeved on the presser foot lever 101 , and the presser foot lifter roller 7 can always be pressed against the presser foot lifter contour surface of the presser foot lifter cam 6 by the spring force of the presser foot spring 103 60 on.
  • the present embodiment further provides a sewing machine, and the sewing machine of the present embodiment includes the thread trimming device of the sewing machine of the present embodiment.
  • the present embodiment further provides a thread trimming control method of the sewing machine.
  • the thread trimming control method of the sewing machine of the present embodiment adopts the thread trimming device of the sewing machine of the present embodiment. Therefore, the thread trimming control method of the sewing machine of the present embodiment is also the working method of the thread trimming device of the sewing machine of the present embodiment.
  • the end point F is the end point of the trimming, and the zero position of the motor (ie the zero position of the rotating shaft 10 of the motor 1) is set at the starting point of the trimming, that is, the end point E of the trimming interval EF.
  • the thread trimming mechanism 5 is driven to perform the thread trimming action, and at the same time, the main shaft of the sewing machine rotates by a thread trimming interval angle.
  • the thread trimming control method of the sewing machine of this embodiment is: when thread trimming, the main shaft of the sewing machine rotates from the main shaft angle A to the main shaft angle C at the main shaft speed n, and the main shaft angle A corresponds to the motor 1
  • the thread trimming start point E of the thread trimming interval EF of the rotating shaft 10 corresponds to the zero position of the motor.
  • the spindle angle C corresponds to the thread trimming end point F of the thread trimming interval EF of the rotating shaft 10 of the motor 1.
  • the motor 1 rotates from the motor zero position to the motor angle a at the first motor speed n 1 and from the motor angle a to the motor at the second motor speed n 2 in the thread trimming interval EF
  • the roller 3 on the driving crank 2 moves along the track groove 43 on the long crank 4 under the drive of the motor 1 and drives the long crank 4 to drive the thread trimming mechanism 5 to perform the thread trimming action.
  • the motor angle a corresponds to the line split time point D in the thread trimming interval EF and the main shaft angle B between the main shaft angle A and the main shaft angle C, that is, the motor 1 is driven from the motor at the first motor speed n 1 in the thread trimming interval EF.
  • the moving knife 55 in the thread trimming mechanism 5 is driven to move toward the fixed knife 56 and hook the suture to be cut and move towards the fixed knife 56 with the suture to complete the line splitting, and reach the splitting line.
  • the rotating shaft 10 of the motor 1 rotates from the motor zero position to the motor angle a
  • the main shaft of the sewing machine rotates from the main shaft angle A to the main shaft angle B.
  • the motor 1 rotates from the motor angle a to the motor angle b at the second motor speed n 2 in the thread trimming interval EF, and drives the movable knife 55 in the thread trimming mechanism 5 to continue to move towards the fixed knife 56 with the suture until it reaches the fixed knife 56.
  • the knife 56 is engaged to cut the suture, and the thread trimming is completed.
  • the rotation speed of the main shaft of the sewing machine remains unchanged and continues to rotate from the main shaft angle B to the main shaft angle C.
  • the motor angle b corresponds to the thread trimming end point F point and the main shaft in the thread trimming interval EF. angle C.
  • the roller 3 moves along the track groove 43 on the long crank 4, which is a closed structure, when the thread trimming is performed, it will not be cut by the force of the closed cam structure in the prior art.
  • the wire speed is too fast and the noise is caused by throwing jumps, so it is not necessary to reduce the noise by reducing the wire trimming speed. Therefore, the determined spindle speed n correlation function can be used to define the first motor speed n 1 and the second motor speed during wire trimming.
  • K 1 and K 2 are setting coefficients, and the setting coefficients are fixed values
  • f(n) and f'(n) are set functions
  • the set functions are fixed functions
  • K 1 , K 2 , f(n) and f'(n) can be based on practical Set the working parameters of the main shaft of the sewing machine.
  • the rotational speed of the motor 1 during thread trimming is only related to the rotational speed of the main shaft n: if the rotational speed of the main shaft n increases, the rotational speed of the first motor n 1 and the rotational speed of the second motor n 2 increase synchronously, so that the thread trimming speed is faster and the The line time is shorter; if the spindle speed n decreases, the first motor speed n 1 and the second motor speed n 2 decrease synchronously, so that the thread trimming speed is slower and the thread trimming time is longer; and, when the spindle speed n changes , the corresponding relationship between the motor angle rotated by the shaft 10 of the motor 1 and the main shaft angle rotated by the main shaft remains unchanged.
  • the thread trimming control method of the sewing machine of this embodiment only needs to adjust the speed n of the main shaft during thread trimming when necessary, so that the adjustment and control of the thread trimming speed can be realized.
  • the thread trimming control method of the sewing machine of this embodiment makes the motor 1 rotate from the motor zero position to the motor angle a at the first motor speed n 1 in the thread trimming interval EF at the initial stage of thread trimming, and the first motor speed n 1 ensures the motor The angle matches the angle of the main shaft to ensure that the movable knife 55 can hook the suture, and then the motor 1 is rotated from the motor angle a to the motor angle b at the second motor speed n 2 in the thread trimming interval EF, and the second motor speed n 2 is greater than the rotational speed n 1 of the first motor, so that the thread trimming can be accelerated after the movable knife 55 is guaranteed to be hooked to the sewing thread, and the thread trimming action can be completed quickly.
  • the motor 1 rotates from the motor angle b to the motor at the third motor speed n 3 in the thread trimming interval EF
  • the zero position that is, the rotating shaft 10 of the motor 1 is reversely rotated and reset, which drives the driving crank 2 and the roller 3 to move in the reverse direction to reset, and the thread trimming mechanism 5 and the long crank 4 are reset under the combined action of the torsion spring 58 and the motor 1, and n 3 ⁇ n 4 , n 4 is the rotational speed of the long crank 4 when the thread trimming mechanism 5 and the long crank 4 are reset under the independent action of the torsion spring 58 .
  • the roller 3 continues to move along the base circle segment 4102 of the wire trimming contour surface 410 of the driving part 41 of the long crank 4 to drive the long crank 4 to perform an idle stroke, so that the roller The roller 3 is always in contact with the base circle segment 4102, which has the effect of buffering, and prevents the roller 3 and the long crank 4 from colliding and causing noise due to the too fast reset speed of the torsion spring 58.
  • the drive crank 2 is fixedly installed on the shaft 10 on one side of the motor 1, and the other side of the motor 1 is provided with a presser foot lifter cam 6 and a presser foot lifter roller 7 .
  • the thread trimming control method of the sewing machine of this embodiment further includes the presser foot lift control.
  • the rotating shaft 10 of the motor 1 also has a presser foot lifting section EG and a presser foot height maintaining section GH in one rotation of the rotating shaft 10 of the motor 1.
  • the presser foot height maintaining section GH, the presser foot lifting section EG and the thread trimming section EF are in sequence.
  • the end point E of the presser foot lift interval EG is the lowest point of the presser foot height (also the zero position of the motor), and the end point G of the presser foot lift interval EG is the highest point of the presser foot height.
  • the thread trimming mechanism 5 is driven to perform the thread trimming action, and then the rotating shaft 10 of the motor 1 rotates from the point F to the point E in the reverse direction to drive the thread trimming.
  • the mechanism 5 is reset.
  • the presser foot lifter roller 7 moves along the presser foot lifter base circular segment 601 of the presser foot lifter cam 6, and the presser foot lifter mechanism 9 does not act.
  • the presser foot lifting mechanism 9 When the rotating shaft 10 of the motor 1 rotates from point E to point G in the presser foot lifting interval EG, the presser foot lifting mechanism 9 is driven to perform the complete presser foot lifting action, so that the presser foot is lifted to the highest point of the presser foot height, and then the motor 1 rotating shaft 10 In the presser foot height maintaining interval GH, it continues to rotate from point G to point H, so that the presser foot is kept at the highest point of the presser foot height, and then the motor 1 rotates reversely from point H to point E, so that the presser foot lifting mechanism 9 is reset.
  • the roller 3 moves along the base circle segment 4102 of the trimming contour surface 410 of the driving part 41 of the long crank 4, the long crank 4 performs an idle stroke, and the trimming mechanism 5 does not act.
  • the motor 1 can reach the zero position of the motor at the fifth motor speed n 5 in the presser foot lifting interval EG. Rotate from point E to point G, the highest point of the height of the presser foot, and drive the presser foot lifting mechanism 9 to perform the action of lifting the presser foot, so that the presser foot is lifted to the highest point of the presser foot height, and then the motor 1 can continue from G in the presser foot height maintaining interval GH. Rotate to point H to keep the presser foot at the highest point of the presser foot height.
  • the presser foot mechanism 9 it is also possible to set a specified height of the presser foot, and drive the presser foot mechanism 9 to lift the presser foot to the specified height of the presser foot and maintain it by controlling the rotation angle of the motor 1 in the presser foot lift interval EG.
  • the motor 1 rotates in the reverse direction at the sixth motor speed n 6 to the motor zero position E, that is, the motor 1 rotates in the opposite direction and resets the shaft 10, which drives the presser foot lifter roller 7 and the presser foot lifter drive.
  • the crank 8 moves in reverse to reset, and the presser foot lifter mechanism 9 is reset under the combined action of the presser foot spring 103 and the motor 1, and n 6 ⁇ n 7 , n 7 is the presser foot lift drive crank 8 and the presser foot lift mechanism 9
  • the motor 1 and the presser foot spring 103 can jointly drive the presser foot lifting mechanism 9 to reset the presser foot to realize the function of slow lowering of the presser foot, which greatly reduces the collision noise when the presser foot is reset and lowered.

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Abstract

本发明涉及缝纫机技术领域，尤其涉及一种缝纫机的剪线装置和包括该剪线装置的缝纫机，该剪线装置包括电机、受电机驱动而转动的驱动曲柄、设于驱动曲柄上的滚子以及与剪线机构相连接的长曲柄，长曲柄包括驱动部和限位部，驱动部具有剪线轮廓面，剪线轮廓面包括受滚子驱动而带动剪线机构执行剪线动作的剪线段，限位部具有与剪线段间隔相对形成一轨迹槽的内侧面，滚子经过剪线段时沿轨迹槽运动。还涉及一种缝纫机的剪线控制方法，采用该剪线装。不会因剪线速度过快而产生抛跳引起噪音。

Description

缝纫机及其剪线装置和剪线控制方法 技术领域
本发明涉及缝纫机技术领域，尤其涉及一种缝纫机的剪线装置、一种包括该剪线装置的缝纫机和一种缝纫机的剪线控制方法。
背景技术
缝纫机中，实现缝纫目的的基本机构为针杆机构、勾线机构、挑线机构和送料机构，这四大机构都由主轴的旋转来驱动。实现剪线目的的为剪线机构，目前市场上的中高端平缝机都采用步进电机驱动剪线机构完成剪线动作，这样可以达到剪线声音低，剪线稳定性提高的效果，提升用户的缝纫体验感。
公告号CN205088427U的实用新型专利公开了一种缝纫机的剪线抬压脚装置，并具体公开了：电机通过凸轮组件驱动剪线机构，所述凸轮组件包括切线曲柄和切刀驱动曲柄，所述切刀驱动曲柄安装于电机的一端轴上，切线曲柄与切线手杆连接，切线曲柄和切刀驱动曲柄偏心连接，且电机驱动切刀驱动曲柄转动，通过切线曲柄带动剪线机构执行剪线动作；所述切刀驱动曲柄上设有通过滚轮轴套接的滚轮，所述切线曲柄上设置有凹槽，所述滚轮可以随着切刀驱动曲柄在凹槽内转动并驱动切线曲柄。该装置中，电机通过切刀驱动曲柄上安装的滚子(滚轮)驱动凸轮(切线曲柄)转动以强制驱动剪线机构完成剪线动作或复位，因此由于切线曲柄中的轨迹形状致使滚子与剪线或复位时与不同的轨迹面进行接触，从而产生碰撞因此产生噪声。同时，又通过对该技术应用产品进行分析，在切线曲柄与切线手杆之间设有扭簧，那么该装置采用的凸轮结构是力闭合结构，受扭簧力的保持作用影响，因此，如果电机转速过高，扭簧力很难保持，容易引起凸轮反复抛跳而引起剪线时的噪音，而电机转速受主轴剪线时的转速的控制，所以采用的剪线控制方法是电机在配合主轴角度可以完成剪线动作的前提下尽可能降低转速来降低噪音，同时电机转动过程中需根据凸轮弧面多次定义转速，不能以简单的函数去定义电机转速，故而只能在一个固定的主轴剪线转速的情况下进行定义编写电控控制函数，不能联动所有的主轴转速，如果主轴转速变化，就需重新修改电控程序，因此，该装置中的剪线速度是固定的，并且剪线速度较慢无法调节加快剪线速度。
发明内容
本发明要解决的技术问题是提供一种缝纫机的剪线装置，不会因剪线速度过快而产生抛跳引起噪音，以克服现有技术的上述缺陷。
为了解决上述技术问题，本发明采用如下技术方案：
本发明提供一种缝纫机的剪线装置，包括电机、受电机驱动而转动的驱动曲柄、设于驱动曲柄上的滚子以及与剪线机构相连接的长曲柄，长曲柄包括驱动部和限位部，驱动部具有与滚子相配合的剪线轮廓面，剪线轮廓面包括受滚子驱动而带动剪线机构执行剪线动作的剪线段，限位部具有内侧面，内侧面与剪线段间隔相对设置形成一轨迹槽，滚子经过剪线段时沿轨迹槽运动。
优选地，内侧面与剪线段相平行且均与滚子的外周面相接触。
优选地，限位部还具有连接面，连接面连接内侧面与剪线段形成U型槽。
优选地，剪线轮廓面还包括与剪线段相连接的基圆段，基圆段与驱动曲柄的转动中心同心设置。
优选地，剪线机构包括可转动的剪线轴和与剪线轴的一端相连接的剪线组件，长曲柄设于剪线轴的另一端。
优选地，剪线组件包括剪线曲柄、剪线连杆、动刀曲柄、动刀和定刀，剪线曲柄的一端安装在剪线轴上，且另一端与剪线连杆的一端相铰接，剪线连杆的另一端与动刀曲柄的一端相铰接，动刀安装在动刀曲柄的另一端上，定刀安装在缝纫机的底板上。
优选地，剪线机构还包括安装在缝纫机的底板上的轴套和套设在轴套上的扭簧，剪线轴穿设于轴套，扭簧的两端分别抵持在底板和剪线组件上。
本发明还提供一种缝纫机，包括如上所述的缝纫机的剪线装置。
本发明还提供一种缝纫机的剪线控制方法，采用如上所述的缝纫机的剪线装置，剪线时，缝纫机的主轴以主轴转速n从主轴角度A转动至主轴角度C，电机在剪线区间内以第一电机转速n 1从电机零位转动至电机角度a并以第二电机转速n 2从电机角度a转动至电机角度b，驱动曲柄上的滚子在电机的驱动下沿长曲柄上的轨迹槽运动并驱动长曲柄带动剪线机构完成剪线动作；其中，n 1＝K 1f(n)，n 2＝K 2f′(n)，并且，n 2>n 1，K 1和K 2为设定系数，f(n)和f′(n)为设定函数。
优选地，剪线机构完成剪线动作后，电机在剪线区间内以第三电机转速n 3从电机角度b转动至电机零位，使剪线机构和长曲柄在扭簧和电机的共同作用下复位，并且，n 3<n 4，n 4为剪线机构和长曲柄在扭簧的单独作用下复位时长曲柄的转速。
与现有技术相比，本发明具有显著的进步：
通过长曲柄上的限位部对滚子经过长曲柄上的剪线段时的运动起到限位作用，使得剪线执行时滚子沿长曲柄上的轨迹槽这一封闭式结构运动，因此不会像现有技术中力闭合式的凸轮结构那样因滚子与轨迹面硬性接触碰撞而产生噪音或因剪线速度过快而产生抛跳引起噪音，故而不需要通过降低剪线速度来降低噪音，由此，本发明可以实现配合缝纫机主轴转速的较快的剪线速度及剪线速度匹配主轴转速的同步调节，同时满足剪线声音低、剪线稳定性好的要求。
附图说明
图1是本发明实施例的缝纫机的剪线装置的结构示意图。
图2是本发明实施例的缝纫机的剪线装置中，驱动曲柄上的滚子与长曲柄的配合示意图。
图3是本发明实施例的缝纫机的剪线装置配置有抬压脚机构的结构示意图。
图4是图3中抬压脚机构的抬压脚凸轮的结构示意图。
图5是图3中抬压脚机构的压脚的结构示意图。
图6是本发明实施例的缝纫机的剪线控制方法的时序示意图。
图7是本发明实施例的缝纫机的剪线控制方法中，电机角度与主轴角度的对应关系示意图。
图8是本发明实施例的缝纫机的剪线控制方法的剪线控制逻辑示意图。
图9是本发明实施例的缝纫机的剪线控制方法包括抬压脚控制时的时序示意图。
图10是本发明实施例的缝纫机的剪线控制方法包括抬压脚控制时的抬压脚控制逻辑示意图。
其中，附图标记说明如下：
1、电机                                 10、转轴
11、电机支架                            2、驱动曲柄
3、滚子                                 4、长曲柄
41、驱动部                              410、剪线轮廓面
4101、剪线段                            4102、基圆段
42、限位部                              420、内侧面
421、连接面                             43、轨迹槽
5、剪线机构                               51、剪线轴
52、剪线曲柄                              53、剪线连杆
54、动刀曲柄                              55、动刀
56、定刀                                  57、轴套
58、扭簧                                  6、抬压脚凸轮
60、抬压脚轮廓面                          601、抬压脚基圆段
602、抬压脚执行段                         603、压脚高度保持段
7、抬压脚滚子                             8、抬压脚驱动曲柄
9、抬压脚机构                             91、抬压脚曲柄轴
92、抬压脚轴套                            93、抬压脚下曲柄
94、顶杆                                  95、后杠杆
96、拉杆                                  97、前杠杆
98、拉块                                  99、挡块
101、压脚杆                               102、压脚组件
103、压脚弹簧
具体实施方式
下面结合附图对本发明的具体实施方式作进一步详细说明。这些实施方式仅用于说明本发明，而并非对本发明的限制。
在本发明的描述中，需要说明的是，术语“中心”、“纵向”、“横向”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性。
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在 本发明中的具体含义。
此外，在本发明的描述中，除非另有说明，“多个”的含义是两个或两个以上。
如图1至图10所示，本发明的缝纫机的剪线装置的一种实施例。
参见图1，本实施例的缝纫机的剪线装置包括电机1、驱动曲柄2、滚子3、长曲柄4和剪线机构5。电机1可以通过电机支架11固定安装在缝纫机的底板上。电机1具有转轴10，驱动曲柄2的一端固定安装在电机1的转轴10上，驱动曲柄2受电机1转轴10的驱动而与电机1转轴10同步转动，且驱动曲柄2的转动中心为电机1转轴10的轴线。优选地，电机1采用步进电机，可以对转轴10的转动速度和转动角度进行精确控制。滚子3设于驱动曲柄2的另一端，驱动曲柄2转动时带动滚子3随之同步转动，因此滚子3的转动中心亦为电机1转轴10的轴线。优选地，滚子3可以通销轴可转动地安装在驱动曲柄2上。长曲柄4与剪线机构5相连接。参见图2，长曲柄4包括驱动部41和限位部42。驱动部41具有与滚子3相配合的剪线轮廓面410，剪线轮廓面410包括受滚子3驱动而带动剪线机构5执行剪线动作的剪线段4101，即电机1转轴10转动而带动驱动曲柄2和滚子3转动时，通过滚子3作用于长曲柄4驱动部41剪线轮廓面410的剪线段4101并沿剪线段4101运动，可驱动长曲柄4转动，由长曲柄4的转动带动剪线机构5执行剪线动作。限位部42具有内侧面420，限位部42的内侧面420与驱动部41剪线轮廓面410的剪线段4101间隔相对设置形成一轨迹槽43，滚子3经过剪线段4101时沿该轨迹槽43运动。通过限位部42对滚子3经过剪线段4101时的运动起到限位作用，使得剪线执行时滚子3沿长曲柄4上的轨迹槽43这一封闭式结构运动，因此不会像现有技术中力闭合式的凸轮结构那样因滚子与轨迹面硬性接触碰撞而产生噪音或因剪线速度过快而产生抛跳引起噪音，故而不需要通过降低剪线速度来降低噪音，由此，本实施例的缝纫机的剪线装置可以实现配合缝纫机主轴转速的较快的剪线速度及剪线速度匹配主轴转速的同步调节，同时满足剪线声音低、剪线稳定性好的要求。
参见图2，本实施例中，优选地，长曲柄4限位部42的内侧面420与驱动部41剪线轮廓面410的剪线段4101相平行且均与滚子3的外周面相接触，即滚子3沿轨迹槽43运动时与限位部42的内侧面420和驱动部41剪线轮廓面410的剪线段4101均保持接触，由此可以确保滚子3在轨迹槽43内运动时不会产生碰撞或抛跳而产生噪音。
进一步，本实施例中，长曲柄4的限位部42还具有连接面421，连接面421连接限位部42的内侧面420与驱动部41剪线轮廓面410的剪线段4101而形成U型槽，即使得所述轨迹槽43为一端封闭的U型槽，并且，连接面421在剪线段4101的剪线末端连接剪线段4101与 内侧面420，因此，剪线时，滚子3从U型槽的开口端进入U型槽内并沿U型槽运动至U型槽的封闭端，即到达剪线段4101的剪线末端，驱动剪线机构5完成剪线动作，从而在剪线完成时，滚子3也处于封闭式的结构内，即U型的轨迹槽43使得剪线执行时和剪线完成复位时滚子3都是在封闭式的结构内运动，可以进一步保证不会发生因剪线速度过快而产生抛跳引起噪音。
参见图1，本实施例中，优选地，剪线机构5可以包括剪线轴51和剪线组件，剪线轴51可转动地支撑在缝纫机的底板上，剪线组件与剪线轴51的一端相连接，长曲柄4设于剪线轴51的另一端。长曲柄4与剪线轴51可以为分体结构，且长曲柄4固定安装在剪线轴51的另一端上；长曲柄4与剪线轴51也可以为一体式的整体结构。当滚子3作用于长曲柄4驱动部41剪线轮廓面410的剪线段4101而驱动长曲柄4转动时，由长曲柄4的转动带动剪线轴51随之转动，由剪线轴51的转动带动剪线组件执行剪线动作。
本实施例中，剪线组件的结构形式并不局限，可以采用现有技术中的任意能够在剪线轴51转动的驱动下执行剪线动作的剪线组件结构。较佳地，参见图1，剪线组件可以包括剪线曲柄52、剪线连杆53、动刀曲柄54、动刀55和定刀56，剪线曲柄52的一端固定安装在剪线轴51上，剪线曲柄52的另一端与剪线连杆53的一端相铰接，剪线连杆53的另一端与动刀曲柄54的一端相铰接，动刀55固定安装在动刀曲柄54的另一端上，定刀56固定安装在缝纫机的底板上，所述动刀曲柄(54)上设有固定的旋转中心。剪线轴51转动时，带动剪线曲柄52随之转动，由剪线曲柄52带动剪线连杆53和动刀曲柄54转动，并由动刀曲柄54带着动刀55朝定刀56运动，动刀55朝定刀56运动的过程中先勾住待剪断的缝线并带着缝线朝定刀56运动而完成分线，然后带着缝线继续朝定刀56运动至与定刀56咬合而将缝线剪断，完成剪线。
进一步，本实施例的剪线机构5还包括轴套57和扭簧58，轴套57固定安装在缝纫机的底板上，扭簧58套设在轴套57上，剪线轴51可转动地穿设于轴套57，扭簧58的两端分别抵持在缝纫机的底板和剪线组件的剪线曲柄52上。扭簧58可以在剪线机构5完成剪线动作后驱动剪线机构5和长曲柄4反向动作复位。本实施例的缝纫机的剪线装置在使用时，电机1驱动剪线机构5完成剪线动作后，电机1换向反转，剪线机构5和长曲柄4在扭簧58和电机1的共同作用下复位。
参见图2，本实施例中，优选地，长曲柄4驱动部41的剪线轮廓面410还可以包括基圆段4102，剪线段4101的一端为剪线末端，基圆段4102则与剪线段4101的另一端相连接， 基圆段4102为圆弧段，并且，基圆段4102与驱动曲柄2的转动中心同心设置，因此，滚子3与驱动曲柄2同步转动且沿基圆段4102运动时不会驱动长曲柄4转动，此时，长曲柄4执行空行程，剪线机构5不动作。基圆段4102可以为受电机1驱动的其它执行机构(如抬压脚机构、牙齿高度调节机构等)留下剪线机构5空行程，从而实现由一个电机1驱动实现多种功能。较佳地，电机1可以采用双输出轴电机，驱动曲柄2设于双输出轴电机一侧的转轴上，其它执行机构则设于双输出轴电机另一侧的转轴上。
以电机1还同时驱动抬压脚机构实现抬压脚功能为例，参见图3，电机1为双输出轴电机，驱动曲柄2固定安装在电机1一侧的转轴10上，电机1另一侧配置有抬压脚凸轮6、抬压脚滚子7、抬压脚驱动曲柄8和抬压脚机构9。抬压脚凸轮6固定安装在电机1另一侧的转轴10上，抬压脚凸轮6受电机1转轴10的驱动而与电机1转轴10同步转动，且抬压脚凸轮6的转动中心为电机1转轴10的轴线。抬压脚滚子7设于抬压脚驱动曲柄8的一端，较佳地，抬压脚滚子7可以通过销轴可转动地安装在抬压脚驱动曲柄8上。抬压脚驱动曲柄8的另一端与抬压脚机构9相连接。参见图4，抬压脚凸轮6具有与抬压脚滚子7相配合的抬压脚轮廓面60，抬压脚滚子7压靠在抬压脚轮廓面60上。抬压脚轮廓面60包括依次相连的抬压脚基圆段601、抬压脚执行段602和压脚高度保持段603，抬压脚基圆段601和压脚高度保持段603都是以抬压脚凸轮6的转动中心为中心的圆弧段，抬压脚执行段602连接抬压脚基圆段601和压脚高度保持段603，且抬压脚执行段602距离抬压脚凸轮6的转动中心的距离逐渐增大。当电机1转轴10转动，使滚子3在长曲柄4上的轨迹槽43内沿驱动部41剪线轮廓面410的剪线段4101运动时，即电机1驱动剪线机构4剪线和剪线完成复位时，抬压脚凸轮6随电机1转轴10转动且抬压脚滚子7沿抬压脚凸轮6的抬压脚基圆段601运动而不会带动抬压脚驱动曲柄8转动，使得抬压脚机构9执行空行程，抬压脚机构9不动作。在剪线完成复位完毕后，电机1转轴10继续转动，滚子3则沿长曲柄4驱动部41剪线轮廓面410的基圆段4102运动，使得长曲柄4执行空行程，剪线机构5不动作，抬压脚滚子7则从抬压脚凸轮6的抬压脚基圆段601进入抬压脚执行段602并沿抬压脚执行段602运动，由抬压脚执行段602驱动抬压脚滚子7带动抬压脚驱动曲柄8转动，并由抬压脚驱动曲柄8的转动带动抬压脚机构9执行抬压脚动作。当抬压脚滚子7沿抬压脚执行段602运动至抬压脚执行段602和压脚高度保持段603的交点处时，压脚抬高至最高高度位置，抬压脚动作完成，电机1转轴10继续转动，抬压脚滚子7进入压脚高度保持段603并沿压脚高度保持段603运动而不会带动抬压脚驱动曲柄8转动，使得抬压脚机构9不动作，此时压脚保持在最高高度位置，由于 此时抬压脚滚子7与抬压脚凸轮6压脚高度保持段603之间的接触力刚好指向抬压脚凸轮6的中心，不存在切向力，因此可以减小压脚保持在最高高度位置时电机1的实际负载，有利于提高电机1的使用寿命。而后电机1转轴10反向转动，使抬压脚滚子7沿抬压脚凸轮6的抬压脚轮廓面60反向运动回到抬压脚基圆段601，即可使抬压脚机构9复位。
参见图3，抬压脚机构9可以包括抬压脚曲柄轴91、抬压脚轴套92、抬压脚下曲柄93、顶杆94、后杠杆95、拉杆96、前杠杆97、拉块98和挡块99。抬压脚轴套92固定安装在缝纫机的底板上，抬压脚曲柄轴91可转动地穿设于抬压脚轴套92。抬压脚滚子7设于抬压脚驱动曲柄8的一端，抬压脚驱动曲柄8的另一端固设于抬压脚曲柄轴91的一端。抬压脚下曲柄93的一端固设于抬压脚曲柄轴91的另一端，抬压脚下曲柄93的另一端与顶杆94的一端相铰接，顶杆94的另一端与后杠杆95的一端相铰接。后杠杆95可转动地铰接在缝纫机的机壳上，后杠杆95的另一端与拉杆96的一端相铰接，拉杆96的另一端与前杠杆97的一端相铰接。前杠杆97可转动地铰接在缝纫机的机壳上，前杠杆97的另一端与拉块98的一端相铰接，拉块98的另一端与挡块99的下表面相接触。挡块99安装在压脚杆101的上端，压脚杆101的下端安装有压脚组件102。当抬压脚滚子7沿抬压脚凸轮6的抬压脚执行段602运动、抬压脚执行段602驱动抬压脚滚子7带动抬压脚驱动曲柄8转动时，由抬压脚驱动曲柄8的转动可带动压脚曲柄轴91和抬压脚下曲柄93同步转动，并由抬压脚下曲柄93的转动带动顶杆94、后杠杆95、拉杆96、前杠杆97和拉块98动作，使拉块98抬着挡块99上升，从而带动压脚杆101和压脚组件102上升，实现抬压脚动作。参见图5，压脚杆101上可以套设有压脚弹簧103，通过压脚弹簧103的弹簧力作用可以使抬压脚滚子7始终压靠在抬压脚凸轮6的抬压脚轮廓面60上。
基于上述缝纫机的剪线装置，本实施例还提供一种缝纫机，本实施例的缝纫机包括本实施例的上述缝纫机的剪线装置。
参见图6至图10，基于上述缝纫机的剪线装置，本实施例还提供一种缝纫机的剪线控制方法。本实施例的缝纫机的剪线控制方法采用本实施例的上述缝纫机的剪线装置，因此，本实施例的缝纫机的剪线控制方法亦为本实施例的上述缝纫机的剪线装置的工作方法。本实施例的上述缝纫机的剪线装置中，电机1转轴10绕转轴10轴线转动的一周中具有一剪线区间EF，剪线区间EF的端点E点为剪线开始点，剪线区间EF的端点F点为剪线终止点，电机零位(即电机1转轴10零位)设于剪线开始点，即设于剪线区间EF的端点E点。电机1转轴10在剪线区间EF内从E点转动至F点时，驱动剪线机构5执行完成剪线动作，与此同时， 缝纫机的主轴转动一剪线区间角度。
参见图6、图7和图8，本实施例的缝纫机的剪线控制方法为：剪线时，缝纫机的主轴以主轴转速n从主轴角度A转动至主轴角度C，主轴角度A对应于电机1转轴10剪线区间EF的剪线开始点E点，亦对应于电机零位，主轴角度C对应于电机1转轴10剪线区间EF的剪线终止点F点，主轴角度A与主轴角度C之间形成主轴的剪线区间角度；同时，电机1在剪线区间EF内以第一电机转速n 1从电机零位转动至电机角度a并以第二电机转速n 2从电机角度a转动至电机角度b，驱动曲柄2上的滚子3在电机1的驱动下沿长曲柄4上的轨迹槽43运动并驱动长曲柄4带动剪线机构5执行完成剪线动作。电机角度a对应于剪线区间EF中的分线时刻点D及位于主轴角度A与主轴角度C之间的主轴角度B，即电机1在剪线区间EF内以第一电机转速n 1从电机零位转动至电机角度a时，驱动剪线机构5中的动刀55朝定刀56运动且勾住待剪断的缝线并带着缝线朝定刀56运动而完成分线，到达分线时刻点D时，电机1转轴10从电机零位转动至电机角度a，缝纫机的主轴则从主轴角度A转动至主轴角度B。而后，电机1在剪线区间EF内以第二电机转速n 2从电机角度a转动至电机角度b，驱动剪线机构5中的动刀55带着缝线继续朝定刀56运动至与定刀56咬合而将缝线剪断，完成剪线，缝纫机的主轴转速不变且从主轴角度B继续转动至主轴角度C，电机角度b对应于剪线区间EF中的剪线终止点F点及主轴角度C。
本实施例缝纫机的剪线控制方法，由于剪线执行时滚子3沿长曲柄4上的轨迹槽43这一封闭式结构运动，不会像现有技术中力闭合式的凸轮结构那样因剪线速度过快而产生抛跳引起噪音，故而不需要通过降低剪线速度来降低噪音，因此可以用确定的主轴转速n相关函数来定义剪线时的第一电机转速n 1和第二电机转速n 2，具体为：n 1＝K 1f(n)，n 2＝K 2f′(n)，并且，n 2>n 1，K 1和K 2为设定系数，且该设定系数为固定值，f(n)和f′(n)为设定函数，且该设定函数为固定函数，K 1、K 2、f(n)和f′(n)均可根据实际应用的缝纫机的主轴工作参数来进行设定。由此，剪线时的电机1转速仅与主轴转速n相关：若主轴转速n增大，则第一电机转速n 1和第二电机转速n 2同步增大，使得剪线速度更快，剪线时间更短；若主轴转速n减小，则第一电机转速n 1和第二电机转速n 2同步减小，使得剪线速度更慢，剪线时间更长；并且，主轴转速n变化时，电机1转轴10转动的电机角度与主轴转动的主轴角度的对应关系始终保持不变。故，本实施例缝纫机的剪线控制方法只需在必要时调节剪线时主轴转速n的大小，就可以实现剪线速度大小的调节控制。此外，本实施例缝纫机的剪线控制方法在剪线初期使电机1在剪线区间EF内以第一电机转速n 1从电机零位转动至电机角度a，该第一电机转速n 1保 证电机角度与主轴角度相匹配，确保动刀55能够勾到缝线，而后使电机1在剪线区间EF内以第二电机转速n 2从电机角度a转动至电机角度b，该第二电机转速n 2大于第一电机转速n 1，即可在保证动刀55勾到缝线后加速剪线，快速完成剪线动作。
进一步，参见图8，本实施例的缝纫机的剪线控制方法，在剪线机构5完成剪线动作后，电机1在剪线区间EF内以第三电机转速n 3从电机角度b转动至电机零位，即电机1转轴10反向转动复位，带动驱动曲柄2和滚子3反向运动复位，剪线机构5和长曲柄4在扭簧58和电机1的共同作用下复位，并且，n 3<n 4，n 4为剪线机构5和长曲柄4在扭簧58的单独作用下复位时长曲柄4的转速。由此可以在剪线机构5和长曲柄4复位完毕后，滚子3继续沿长曲柄4驱动部41剪线轮廓面410的基圆段4102运动而驱动长曲柄4执行空行程时，使滚子3始终与基圆段4102保持接触，起到缓冲的效果，防止因扭簧58复位速度过快导致滚子3与长曲柄4前后位置不一样而发生碰撞引起噪音。
参见图9和图10，当电机1为双输出轴电机，驱动曲柄2固定安装在电机1一侧的转轴10上，电机1另一侧配置有抬压脚凸轮6、抬压脚滚子7、抬压脚驱动曲柄8和抬压脚机构9时，本实施例的缝纫机的剪线控制方法还包括抬压脚控制。此时，电机1转轴10绕转轴10轴线转动的一周中还具有一抬压脚区间EG和一压脚高度保持区间GH，压脚高度保持区间GH、抬压脚区间EG和剪线区间EF依次相连，抬压脚区间EG的端点E点为压脚高度最低点(亦为电机零位)，抬压脚区间EG的端点G点为压脚高度最高点。当电机1转轴10在剪线区间EF内从E点转动至F点时，驱动剪线机构5执行完成剪线动作，而后电机1转轴10从F点反向转动返回至E点，驱动剪线机构5复位，该过程中，抬压脚滚子7沿抬压脚凸轮6的抬压脚基圆段601运动，抬压脚机构9不动作。当电机1转轴10在抬压脚区间EG内从E点转动至G点时，驱动抬压脚机构9执行完成抬压脚动作，使压脚抬升至压脚高度最高点，然后电机1转轴10在压脚高度保持区间GH继续从G点转动至H点，使压脚保持在压脚高度最高点，而后电机1转轴10从H点反向转动返回至E点，使抬压脚机构9复位，该过程中，滚子3沿长曲柄4驱动部41剪线轮廓面410的基圆段4102运动，长曲柄4执行空行程，剪线机构5不动作。
由此，在剪线机构5完成剪线动作且复位完毕后，即电机1转轴10复位至电机零位后，电机1可以在抬压脚区间EG内以第五电机转速n 5从电机零位E点转动至压脚高度最高点G点，驱动抬压脚机构9执行完成抬压脚动作，使压脚抬升至压脚高度最高点，然后电机1可以在压脚高度保持区间GH继续从G点转动至H点，使压脚保持在压脚高度最高点。也可以在设置 指定的抬压脚高度值，通过电机1在抬压脚区间EG内的转动角度的控制实现驱动抬压脚机构9将压脚抬升至指定的抬压脚高度值并保持。保持压脚高度设定时间后，电机1以第六电机转速n 6反向转动至电机零位E点，即电机1转轴10反向转动复位，带动抬压脚滚子7和抬压脚驱动曲柄8反向运动复位，抬压脚机构9在压脚弹簧103和电机1的共同作用下复位，并且，n 6<n 7，n 7为抬压脚驱动曲柄8和抬压脚机构9在压脚弹簧103单独作用下复位时抬压脚驱动曲柄8的转速。使n 6<n 7，可以在电机1和压脚弹簧103共同驱动抬压脚机构9复位时实现压脚缓降的功能，大大减少压脚复位下降时碰撞的噪音。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明技术原理的前提下，还可以做出若干改进和替换，这些改进和替换也应视为本发明的保护范围。

Claims (10)

  1. 一种缝纫机的剪线装置，其特征在于，包括电机(1)、受所述电机(1)驱动而转动的驱动曲柄(2)、设于所述驱动曲柄(2)上的滚子(3)以及与剪线机构(5)相连接的长曲柄(4)，所述长曲柄(4)包括驱动部(41)和限位部(42)，所述驱动部(41)具有与所述滚子(3)相配合的剪线轮廓面(410)，所述剪线轮廓面(410)包括受所述滚子(3)驱动而带动所述剪线机构(5)执行剪线动作的剪线段(4101)，所述限位部(42)具有内侧面(420)，所述内侧面(420)与所述剪线段(4101)间隔相对设置形成一轨迹槽(43)，所述滚子(3)经过所述剪线段(4101)时沿所述轨迹槽(43)运动。
  2. 根据权利要求1所述的缝纫机的剪线装置，其特征在于，所述内侧面(420)与所述剪线段(4101)相平行且均与所述滚子(3)的外周面相接触。
  3. 根据权利要求1所述的缝纫机的剪线装置，其特征在于，所述限位部(42)还具有连接面(421)，所述连接面(421)连接所述内侧面(420)与所述剪线段(4101)形成U型槽。
  4. 根据权利要求1所述的缝纫机的剪线装置，其特征在于，所述剪线轮廓面(410)还包括与所述剪线段(4101)相连接的基圆段(4102)，所述基圆段(4102)与所述驱动曲柄(2)的转动中心同心设置。
  5. 根据权利要求1所述的缝纫机的剪线装置，其特征在于，所述剪线机构(5)包括可转动的剪线轴(51)和与所述剪线轴(51)的一端相连接的剪线组件，所述长曲柄(4)设于所述剪线轴(51)的另一端，所述剪线组件包括在相对移动过程中可以实现剪线的动刀(55)和定刀(56)。
  6. 根据权利要求5所述的缝纫机的剪线装置，其特征在于，所述剪线组件包括剪线曲柄(52)、剪线连杆(53)、动刀曲柄(54)，所述剪线曲柄(52)的一端安装在所述剪线轴(51)上，且另一端与所述剪线连杆(53)的一端相铰接，所述剪线连杆(53)的另一端与所述动刀曲柄(54)的一端相铰接，所述动刀(55)安装在所述动刀曲柄(54)的另一端上，所述定刀(56)安装在缝纫机的底板上上，所述动刀曲柄(54)上设有固定的旋转中心。
  7. 根据权利要求5所述的缝纫机的剪线装置，其特征在于，所述剪线机构(5)还包括安装在缝纫机的底板上的轴套(57)和套设在所述轴套(57)上的扭簧(58)，所述剪线轴(51)穿设于所述轴套(57)，所述扭簧(58)的两端分别抵持在所述底板和所述剪线组件上。
  8. 一种缝纫机，其特征在于，包括如权利要求1至7中任意一项所述的缝纫机的剪线装置。
  9. 一种缝纫机的剪线控制方法，其特征在于，采用如权利要求1至7中任意一项所述的缝纫机的剪线装置，剪线时，缝纫机的主轴以主轴转速n从主轴角度A转动至主轴角度C，所述电机(1)在剪线区间内以第一电机转速n 1从电机零位转动至电机角度a并以第二电机转速n 2从所述电机角度a转动至电机角度b，所述驱动曲柄(2)上的滚子(3)在所述电机(1)的驱动下沿所述长曲柄(4)上的轨迹槽(43)运动并驱动所述长曲柄(4)带动所述剪线机构(5)完成剪线动作；其中，n 1＝K 1f(n)，n 2＝K 2f′(n)，并且，n 2>n 1，K 1和K 2为设定系数，f(n)和f′(n)为设定函数。
  10. 根据权利要求9所述的缝纫机的剪线控制方法，其特征在于，所述剪线机构(5)完成剪线动作后，所述电机(1)在剪线区间内以第三电机转速n 3从所述电机角度b转动至所述电机零位，使所述剪线机构(5)和所述长曲柄(4)在扭簧(58)和所述电机(1)的共同作用下复位，并且，n 3<n 4，n 4为所述剪线机构(5)和所述长曲柄(4)在所述扭簧(58)的单独作用下复位时所述长曲柄(4)的转速。
PCT/CN2021/135969 2021-04-23 2021-12-07 缝纫机及其剪线装置和剪线控制方法 WO2022222487A1 (zh)

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