WO2021227260A1 - 一种集抬压脚和调节线张力于一体的缝纫机 - Google Patents

一种集抬压脚和调节线张力于一体的缝纫机 Download PDF

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Publication number
WO2021227260A1
WO2021227260A1 PCT/CN2020/105352 CN2020105352W WO2021227260A1 WO 2021227260 A1 WO2021227260 A1 WO 2021227260A1 CN 2020105352 W CN2020105352 W CN 2020105352W WO 2021227260 A1 WO2021227260 A1 WO 2021227260A1
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WIPO (PCT)
Prior art keywords
presser foot
thread
driving
lifting
sewing machine
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PCT/CN2020/105352
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English (en)
French (fr)
Inventor
管建平
林晓晓
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杰克缝纫机股份有限公司
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Publication of WO2021227260A1 publication Critical patent/WO2021227260A1/zh

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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B29/00—Pressers; Presser feet
    • D05B29/02—Presser-control devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B29/00—Pressers; Presser feet
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B29/00—Pressers; Presser feet
    • D05B29/06—Presser feet
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B47/00—Needle-thread tensioning devices; Applications of tensometers
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B47/00—Needle-thread tensioning devices; Applications of tensometers
    • D05B47/04—Automatically-controlled tensioning devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/10—Electrical or electromagnetic drives

Definitions

  • the invention relates to a sewing machine integrating presser foot lifting and thread tension adjustment.
  • the height of the presser foot is not adjustable; and, due to the movement nature of the electromagnet, there will be a greater impulse during the presser foot lifting process, and it is difficult to control the buffer when the presser foot is lowered, so when the presser foot is raised and lowered
  • the impact force is relatively large, which in turn produces relatively large noise and vibration.
  • the sewing machine is also provided with a thread clamp.
  • the thread clamp is an electronic thread clamp and the drive source is also an electromagnet.
  • the thread clamp clamps the thread during sewing and gives a certain thread tension to the upper thread.
  • the thread clamp is used for trimming. Loosen the thread so that a longer upper thread end can be obtained on the needle side, thereby preventing the upper thread from escaping from the needle. Therefore, the sewing machine is equipped with at least two electromagnets for performing presser foot lifting, thread clamping and thread loosening, respectively, which increases the cost of the sewing machine and makes the sewing machine bulky.
  • the thread clamp is also equipped with an adjusting knob, which acts on the thread clamp spring in the thread clamp.
  • the user manually rotates the adjusting knob to adjust the spring force of the thread clamp spring, thereby adjusting the thread clamp applied to the upper thread.
  • the tension of the thread that is, adjust the thread tension. Therefore, the thread clamping force of the thread clamp in the existing sewing machine is manually adjusted, which is time-consuming and labor-intensive.
  • the purpose of the present invention is to provide a sewing machine that integrates presser foot lifting and thread tension adjustment, and uses the same motor to realize automatic presser foot lifting and automatic thread tension adjustment.
  • the sewing machine includes:
  • Presser foot lifting assembly includes a press bar that can move up and down, a presser foot installed at the lower end of the press bar, and a guide frame fixed on the press bar;
  • Thread clamp includes an axially movable thread gripper, a thread gripper and a thread spring sleeved on the thread gripper, and a spring limiter arranged on the thread gripper, both ends of the thread gripper spring Abutting with the clamping piece and the spring limiter;
  • Drive mechanism comprising a drive crank driven by the drive motor, a presser foot lifting clutch assembly connected between the drive crank and the guide frame, and a wire tension adjustment clutch assembly connected between the drive crank and the wire clamping lever;
  • the output angle of the drive motor has a presser foot lifting range and a wire tension adjustment range; when the motor shaft of the drive motor rotates within the presser foot lifting range, the presser foot clutch assembly makes the drive crank and the guide frame between There is power transmission, the wire tension adjustment clutch assembly causes no power transmission between the drive crank and the wire clamping lever; when the motor shaft of the drive motor rotates within the online tension adjustment range, the presser foot lifting clutch assembly causes the drive crank There is no power transmission between the wire and the guide frame, and the wire tension adjusting clutch assembly enables power transmission between the driving crank and the wire clamping rod.
  • the thread clamp is in a thread-releasing state.
  • the presser foot lifting clutch assembly includes a presser foot lifting link, a presser foot lifting rocker with a first fixed swing fulcrum, and a presser foot lifting push rod fixed to the presser foot lifting link.
  • the two ends of the connecting rod are respectively hinged with the driving crank and the presser foot lifting rocker, and the hinge point of the presser foot lifting connecting rod and the driving crank is eccentric to the rotation center of the driving crank; when the motor shaft of the driving motor is in the presser foot lifting range When rotating internally, the presser foot push rod abuts and cooperates with the guide frame; when the motor shaft of the drive motor rotates within the online tension adjustment range, the presser foot push rod is located below the guide frame and the two are separated .
  • the wire tension adjustment clutch assembly includes a roller mounted on a driving crank, a driving lever having a second fixed swing fulcrum, and a connecting joint fixed on the wire clamping rod, and one end of the driving lever has a lever driving part , The other end is provided with a sliding groove extending along the length of the driving lever, the connecting joint has a connecting shaft part, the connecting shaft part is inserted in the sliding groove, and the two slidingly cooperate; when the motor shaft of the driving motor When rotating within the range of lifting the presser foot, the lever driving part of the driving lever is separated from the roller; when the motor shaft of the driving motor rotates within the online tension adjustment range, the lever driving part of the driving lever abuts against the roller Cooperate.
  • the driving motor is a stepping motor.
  • the thread clamp further includes a thread clamp seat fixed to the housing of the sewing machine, the thread clamp rod is movably inserted in the thread clamp seat, and the thread clamp has two and two thread clamps.
  • a wire clamping cavity is formed between the pieces, one of the wire clamping pieces abuts the wire clamping seat, and the other wire clamping piece abuts the wire clamping spring.
  • the spring limiting member is a knob, and the knob and the wire clamping rod are in a separate structure, and the wire clamping rod is fixedly connected or threaded to the knob.
  • the spring limiting member is a brim portion, and the brim portion is integrally formed on the wire clamping rod.
  • the sewing machine related to the present invention has the following beneficial effects:
  • the same drive motor can be used to automatically raise the presser foot and automatically adjust the thread tension.
  • the thread tension When the thread tension is automatically adjusted, it includes the thread clamping action and the thread loosening action of the thread tensioner, and the drive motor is in There will be no impact during operation.
  • the present application can reduce the cost of the sewing machine, optimize the structure of the sewing machine, and reduce when the presser foot is raised and lowered, when the thread tension is adjusted, when the thread clamp is clamped, and the thread clamp is loosened. The noise at the time.
  • the output angle of the drive motor is controllable, so that the lifting height of the presser foot is also controllable, and the presser foot can be lifted up to any height below the highest point.
  • Figure 1 is a schematic diagram of the structure of the sewing machine in this application.
  • Figure 2 is a schematic diagram of the connection between the presser foot assembly, the thread clamp, the drive motor and the drive mechanism in this application.
  • Fig. 3 is a schematic diagram of the structure of Fig. 2 after omitting the drive motor and the motor base.
  • FIG. 4 is a schematic diagram of the connection between the driving motor, the presser foot lifting clutch assembly and the presser foot lifting assembly in this application.
  • Figure 5 is a schematic diagram of the connection between the drive motor, the thread tension adjustment clutch assembly and the thread clamp in this application.
  • the application provides a sewing machine integrating presser foot lifting and thread tension adjustment.
  • each direction are as follows: the axial direction of the main shaft of the sewing machine is defined as the left and right direction, and the direction of the main shaft facing the sewing machine head (ie, the needle side) is the left direction, and the main shaft faces the sewing machine.
  • the direction of the tail is the right direction; the movement direction of the sewing material when the sewing machine is sewing is defined as the front direction; the direction orthogonal to both the left and right directions and the front and rear directions is defined as the up and down direction.
  • the sewing machine related to the present application includes a casing 10, a presser foot assembly, a thread clamp, a driving motor 40 installed on the casing 10, and a driving mechanism.
  • the presser foot lifting assembly includes a presser bar 21 extending up and down, a presser foot 22 installed at the lower end of the presser bar 21, and a guide frame 23 fixed on the upper end of the presser bar 21.
  • the presser bar 21 is mounted on the sewing machine housing 10 so as to move up and down. middle.
  • the thread clamp includes a thread tension rod 31 extending back and forth, a thread tension piece 32 and a thread tension spring 33 that are all sleeved on the thread tension rod 31, and a spring limiter 34 installed at the rear end of the thread tension rod 31, the thread tension rod 31 It is installed in the sewing machine housing 10 so that it can move back and forth.
  • the thread tension spring 33 extends forward and backward.
  • the spring 33 and the spring limiter 34 are distributed in sequence from front to back.
  • the driving mechanism includes a driving crank 50 driven to rotate by a driving motor 40, a presser foot lifting clutch assembly connected between the driving crank 50 and the guide frame 23, and a thread tension adjusting clutch connected between the driving crank 50 and the thread clamping lever 31 Components.
  • the output rotation angle of the driving motor 40 has a presser foot lifting range and a wire tension adjustment range
  • the wire tension adjustment range includes a rotation angle value corresponding to a wire tension of zero.
  • the sewing machine involved in this application adopts the same drive motor 40 to automatically raise the presser foot and automatically adjust the thread tension.
  • the thread tension includes the thread clamping action and the thread loosening action of the thread tensioner.
  • the presser foot When the presser foot is lifted, the presser foot 22 can be lifted up to any height below the highest point, and the driving motor 40 will not generate impact force during operation. Therefore, the present application can reduce the cost of the sewing machine, optimize the structure of the sewing machine, and reduce the noise when the presser foot 22 is raised and lowered, when the thread tension is adjusted, when the thread clamp is clamped, and the clamp is loosened.
  • the height of the lift is controllable.
  • the pressing rod 21 can be moved up and down through a bushing 24 which is fixed in the casing 10, and the needle plate of the sewing machine is under the pressing foot 22.
  • the driving motor 40 is a stepping motor, which can improve the control accuracy.
  • the driving motor 40 is fixedly installed on a motor base 80, and the motor base 80 is fixedly installed on the casing 10 by screws, and then the driving motor 40 is installed on the casing 10.
  • a shaft sleeve 90 is also fixed on the left side of the motor base 80.
  • the motor shaft of the drive motor 40 extends left and right and is rotatably supported in the shaft sleeve 90.
  • the drive crank 50 is fixed on the left end of the motor shaft of the drive motor 40.
  • the driving motor 40 directly drives the driving crank 50 to rotate.
  • the thread clamp is in a loose thread state.
  • the thread clamp spring 33 in the thread clamp is fully restored to its original length, and the thread tension of the upper thread Is zero.
  • the presser foot lifting clutch assembly includes a presser foot lifting link 61, a presser foot lifting rocker 62 having a first fixed swing fulcrum, and a presser foot lifting rocker 62 fixed to the lifter
  • the upper end of the presser foot connecting rod 61 is hinged to the left end surface of the driving crank 50 by an axial screw extending left and right, and the presser foot lifting connecting rod 61 and the driving crank 50
  • the hinge point is eccentric to the center of rotation of the driving crank 50.
  • the center of rotation of the driving crank 50 is the center of rotation of the motor shaft of the driving motor 40;
  • the rear end of the presser foot rocker 62 is rotatably sleeved on a first supporting pin 64 extending from the left and right, the first supporting pin 64 is fixed to the housing 10 of the sewing machine, and the first supporting pin 64 It constitutes the first fixed swing fulcrum of the presser foot lifting rocker 62;
  • the presser foot lifting push rod 63 extends left and right, the fixed point of the presser foot lifting push rod 63 and the presser foot lifting link 61 is located at the middle and lower section of the presser foot lifting link 61
  • the part of the presser foot lifter rod 63 that protrudes to the left from the presser foot lifter link 61 is located on the lower side of the guide frame 23 and can abut the guide frame 23.
  • the presser foot push rod 63 abuts and cooperates with the guide frame 23.
  • the drive crank 50 passes through
  • the presser foot lifting link 61 drives the presser foot push rod 63 to move up, and the presser foot push rod 63 pushes the guide frame 23 to move up together, and then drives the press rod 21 and the presser foot 22 to move up, thereby performing the presser foot lifting action.
  • the presser foot lifting push rod 63 is always located below the guide frame 23 and the two are separated.
  • the wire tension adjustment clutch assembly includes a roller 71 mounted on the right end surface of the drive crank 50, and a drive lever 72 with a second fixed swing fulcrum.
  • the connecting joint 73 fixed on the clamping lever 31; the roller 71 is eccentric to the rotation center of the driving crank 50; the upper end of the driving lever 72 has a lever driving portion 721, and the lower end is provided with a sliding groove 722 extending along the length of the driving lever 72
  • the connecting joint 73 includes a joint body portion 731, and a connecting shaft portion 732 extending from the right end of the joint body portion 731 to the right.
  • the front end of the wire clamping lever 31 is fixed in the joint body portion 731, and the connecting shaft portion 732 passes through the drive In the sliding groove 722 at the lower end of the lever 72, the two are slidingly matched.
  • the lever driving portion 721 of the driving lever 72 is separated from the roller 71.
  • the thread clamping lever 31 also does not move and maintains the current state, so that the entire thread clamp maintains the current state.
  • the lever drive portion 721 of the drive lever 72 abuts and cooperates with the roller 71.
  • the drive motor 40 drives the drive crank 50 to rotate
  • the drive crank 50 is moved by the roller 71
  • the driving lever 72 rotates around its second fixed swing fulcrum, and then drives the thread clamping lever 31 to move forward or right through the connecting joint 73, thereby adjusting the thread tension, or causing the thread clamp to perform the thread clamping action, or the thread clamp to perform Loosen the thread.
  • a second supporting pin 74 extending left and right is fixed on the left end surface of the bearing, and the driving lever 72 is rotatably sleeved on the second supporting pin 74.
  • the second supporting pin 74 constitutes the second fixed swing fulcrum of the drive lever 72.
  • the second support pin 74 is also provided with a circlip 75, which cooperates with the bearing to limit the driving lever 72 in the left-right direction.
  • the thread clamp also includes a thread clamp seat 35 fixed to the sewing machine housing 10, whereby the thread clamp is integrally installed on the sewing machine housing 10; In the wire seat 35, there are two wire clamping pieces 32, which are arranged front and back.
  • a wire clamping cavity is formed between the two wire clamping pieces 32.
  • the wire clamping piece 32 on the front side abuts against the front end surface of the wire clamping base 35.
  • the thread clamping piece 32 located on the rear side abuts against the rear end of the thread clamping spring 33.
  • the spring limit member 34 has the following two embodiments.
  • the spring limiting member 34 is a knob, and the knob and the wire clamping rod 31 are of a separate structure, and the connection between the two has the following two ways, the first way is to fix the two Connection, the knob is directly fixed on the back end of the thread clamping lever 31, at this time, the thread tension can only be automatically adjusted by the drive motor 40; Method two, the two are threaded, the knob is threaded to the spring limit piece 34, at this time, except In addition to automatically adjusting the thread tension by driving the motor 40, the thread tension can also be manually adjusted by manually turning the knob.
  • the second embodiment of the spring limiting member 34 is a knob, and the knob and the wire clamping rod 31 are of a separate structure, and the connection between the two has the following two ways, the first way is to fix the two Connection, the knob is directly fixed on the back end of the thread clamping lever 31, at this time, the thread tension can only be automatically adjusted by the drive motor 40;
  • the spring limiting member 34 is a brim part which is integrally formed at the rear end of the wire clamping rod 31, that is, the spring limiting member 34 and the wire clamping rod 31 are an integral structure At this time, the thread tension can only be automatically adjusted by driving the motor 40.
  • the electrical control module of the sewing machine controls the drive motor 40 to energize; when the sewing machine starts sewing, the electrical control module of the sewing machine controls the output angle of the drive motor 40 to be a value within the thread tension adjustment range, and the thread tension spring 33 is in In the compressed state, the thread tension spring 33 applies pressure to the thread tension piece 32 on the rear side, thereby causing the upper thread to have thread tension.
  • the motor shaft of the driving motor 40 rotates counterclockwise, driving the driving crank 50 to rotate counterclockwise together, so that the roller 71 moves backward, and then the lever driving part 721 at the upper end of the driving lever 72 is pushed backward.
  • the driving lever 72 swings clockwise around the second support pin 74, and the wire clamping lever 31 is driven to move forward through the connecting joint 73, and the wire clamping lever 31 drives the spring stopper 34 at the rear end thereof to move forward together to further compress the wire clamping spring 33 and clamp
  • the pressure applied by the thread spring 33 to the rear thread clamping piece 32 increases, thereby increasing the thread tension of the upper thread.
  • the motor shaft of the driving motor 40 rotates clockwise, driving the driving crank 50 to rotate clockwise together, so that the roller 71 moves forward, and the driving lever 72 rotates backwards around the second support pin 74
  • the thread clamping lever 31 is moved backward through the connecting joint 73, and the thread clamping lever 31 drives the spring stopper 34 at its rear end to move backward together.
  • the thread clamping spring 33 extends, and the thread clamping spring 33 pairs the rear clamping piece 32. The applied pressure is reduced, thereby reducing the thread tension of the upper thread.
  • the clamping force applied by the thread clamping piece 32 to the upper thread is zero, that is, the thread clamping device performs the thread loosening action.
  • the motor shaft of the driving motor 40 continues to rotate clockwise, the roller 71 is separated from the lever driving portion 721 at the upper end of the driving lever 72, and then the presser foot can be raised.
  • the motor shaft of the driving motor 40 rotates clockwise to a rotation angle value within the presser foot lifting range.
  • the drive crank 50 drives the presser foot lifter rod 63 to move upward through the presser foot connecting rod 61.
  • the presser foot lifting push rod 63 abuts against the guide frame 23, pushes the guide frame 23 and the press rod 21 to move upward, and raises the presser foot 22.
  • the lifting height of the presser foot 22 is not the same, thereby having multiple presser lifting heights.
  • the present application controls the drive motor 40 through the sewing machine electronic control module, which can perform the thread clamping action, the thread loosening action, and the thread tension adjustment of the thread clamp. Controllable, no impact occurs when the presser foot 22 is raised or lowered, and the noise during the operation of the sewing machine is reduced.
  • the present invention effectively overcomes various shortcomings in the prior art and has a high industrial value.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

一种集抬压脚和调节线张力于一体的缝纫机，包括：抬压脚组件：包括可上下移动的压杆（21）、安装在压杆（21）下端的压脚（22）、以及固定在压杆（21）上的导架（23）；夹线器：包括可轴向移动的夹线杆（31）、套装在夹线杆（31）上的夹线片（32）和夹线弹簧（33）、以及安装在夹线杆（31）上的弹簧限位件（34），夹线弹簧（33）的两端与夹线片（32）和弹簧限位件（34）抵接；驱动电机（40）；驱动机构：包括由驱动电机（40）驱动转动的驱动曲柄（50）、连接在驱动曲柄（50）和导架（23）之间的抬压脚离合组件、以及连接在驱动曲柄（50）和夹线杆（31）之间的线张力调节离合组件。能够降低缝纫机的成本，优化缝纫机的结构，降低压脚（22）抬起和放下时、调节线张力时、夹线器夹线时、夹线器松线时的噪音，且压脚（22）抬起的高度可控，能够将压脚（22）向上抬起至最高点下的任意高度。

Description

一种集抬压脚和调节线张力于一体的缝纫机
本申请要求于2020年5月15日提交中国专利局、申请号为202010413599.7、发明名称为“一种集抬压脚和调节线张力于一体的缝纫机”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及一种集抬压脚和调节线张力于一体的缝纫机。
背景技术
目前，平缝机中都配置有抬压脚机构，用于执行抬压脚动作。现有的抬牙脚机构都为自动抬压脚机构，抬压脚驱动源通常为电磁铁，比如申请号为201821897744.8的中国实用新型专利说明书所公开的一种抬压脚机构。但是，电磁铁驱动抬压脚时，电磁铁铁芯的运动行程为固定值，电磁铁动作时只能一次性将压脚上抬至最高点，而不能将压脚向上抬起至最高点下的任意高度，即抬压脚高度不可调；并且，由于电磁铁的运动性质，压脚抬起过程中会有较大冲量，压脚放下时也难以控制缓冲，故压脚抬起和放下时的冲击力都较大，进而产生较大的噪音振动。
进一步地，缝纫机上还设置有夹线器，夹线器为电子夹线器、驱动源也为电磁铁，缝纫时夹线器夹线、给予面线一定的线张力，剪线时夹线器松线，以能够在机针侧得到较长的面线线头，由此避免面线从机针中脱离出。因此，缝纫机中至少配置两个电磁铁，分别用于执行抬压脚、以及夹线和松线，故而增加了缝纫机的成本，且使得缝纫机的体积较为庞大。
进一步地，夹线器上还配置有调节旋钮，调节旋钮作用于夹线器中的夹线弹簧，用户手动转动调节旋钮可调节夹线弹簧的弹簧力，由此调节夹线器施加于面线的夹线力，也即调节线张力。因此，现有缝纫机中夹线器的夹线力为手动调节，费时费力。
发明内容
鉴于以上所述现有技术的缺点，本发明的目的在于提供一种集抬压脚和调节线张力于一体的缝纫机，采用同一个电机实现自动抬压脚和自动调节线张力。
为实现上述目的，本发明提供一种集抬压脚和调节线张力于一体的缝纫机，所述缝纫机包括：
抬压脚组件：包括可上下移动的压杆、安装在压杆下端的压脚、以及固定在压杆上的导架；
夹线器：包括可轴向移动的夹线杆、套装在夹线杆上的夹线片和夹线弹簧、以及设置在夹线杆上的弹簧限位件，所述夹线弹簧的两端与夹线片和弹簧限位件抵接；
驱动电机；
驱动机构：包括由所述驱动电机驱动转动的驱动曲柄、连接在驱动曲柄和导架之间的抬压脚离合组件、以及连接在驱动曲柄和夹线杆之间的线张力调节离合组件；
所述驱动电机的输出转角具有抬压脚范围和线张力调节范围；当所述驱动电机的电机轴在抬压脚范围内转动时，所述抬压脚离合组件使驱动曲柄和导架之间有动力传递，所述线张力调节离合组件使驱动曲柄和夹线杆之间无动力传递；当所述驱动电机的电机轴在线张力调节范围内转动时，所述抬压脚离合组件使驱动曲柄和导架之间无动力传递，所述线张力调节离合组件使驱动曲柄和夹线杆之间有动力传递。
进一步地，当所述驱动电机的电机轴在抬压脚范围内转动时，所述夹线器处于松线状态。
进一步地，所述抬压脚离合组件包括抬压脚连杆、具有第一固定摆动支点的抬压脚摇杆、以及固定于抬压脚连杆的抬压脚推杆，所述抬压脚连杆的两端分别与驱动曲柄和抬压脚摇杆铰接、且抬压脚连杆与驱动曲柄的铰接点偏心于驱动曲柄的转动中心；当所述驱动电机的电机轴在抬压脚范围内转动时，所述抬压脚推杆与导架抵接配合；当所述驱动电机的电机轴在线张力调节范围内转动时，所述抬压脚推杆位于导架的下方、两者分离。
进一步地，所述线张力调节离合组件包括安装在驱动曲柄上的滚轮、 具有第二固定摆动支点的驱动杠杆、以及固定在夹线杆上的连接接头，所述驱动杠杆的一端具有杠杆驱动部、另一端开设有沿驱动杠杆长度方向延伸的滑槽，所述连接接头上具有连接轴部，所述连接轴部穿设在滑槽中、两者滑动配合；当所述驱动电机的电机轴在抬压脚范围内转动时，所述驱动杠杆的杠杆驱动部与滚轮相分离；当所述驱动电机的电机轴在线张力调节范围内转动时，所述驱动杠杆的杠杆驱动部与滚轮抵接配合。
进一步地，所述驱动电机为一步进电机。
进一步地，所述夹线器还包括固定于缝纫机机壳的夹线座，所述夹线杆可移动地穿设在夹线座中，所述夹线片有两个、且两个夹线片之间形成有夹线腔，其中一个夹线片与所述夹线座抵接、另一个夹线片与所述夹线弹簧抵接。
进一步地，所述弹簧限位件为一旋钮，所述旋钮与夹线杆之间为分体结构，所述夹线杆与旋钮固定连接或螺纹连接。
进一步地，所述弹簧限位件为一帽檐部，所述帽檐部一体地形成在所述夹线杆上。
如上所述，本发明涉及的缝纫机，具有以下有益效果：
本申请涉及的缝纫机中，采用同一个驱动电机可实现自动抬压脚和自动调节线张力，且在自动调节线张力时，包含执行夹线器的夹线动作和松线动作，且驱动电机在运转过程中不会产生冲击力。基于此，本申请相对于现有技术而言，能够降低缝纫机的成本，优化缝纫机的结构，降低压脚抬起和放下时、调节线张力时、夹线器夹线时、夹线器松线时的噪音。特别地，在抬压脚时，驱动电机的输出角度可控，使得压脚抬起的高度也可控，能够将压脚向上抬起至最高点下的任意高度。
附图说明
图1为本申请中缝纫机的结构示意图。
图2为本申请中抬压脚组件、夹线器、驱动电机和驱动机构之间的连接示意图。
图3为图2省略驱动电机和电机座后的结构示意图。
图4为本申请中驱动电机、抬压脚离合组件和抬压脚组件之间的连接示意图。
图5为本申请中驱动电机、线张力调节离合组件和夹线器之间的连接示意图。
元件标号说明
10                 机壳
21                 压杆
22                 压脚
23                 导架
24                 衬套
31                 夹线杆
32                 夹线片
33                 夹线弹簧
34                 弹簧限位件
35                 夹线座
40                 驱动电机
50                 驱动曲柄
61                 抬压脚连杆
62                 抬压脚摇杆
63                 抬压脚推杆
64                 第一支撑销
71                 滚轮
72                 驱动杠杆
721                杠杆驱动部
722                滑槽
73                 连接接头
731                接头本体部
732                连接轴部
74                  第二支撑销
75                  卡簧
80                  电机座
90                  轴套
具体实施方式
以下由特定的具体实施例说明本发明的实施方式，熟悉此技术的人士可由本说明书所揭露的内容轻易地了解本发明的其他优点及功效。
须知，本说明书附图所绘的结构、比例、大小等，均仅用以配合说明书所揭示的内容，以供熟悉此技术的人士了解与阅读，并非用以限定本发明可实施的限定条件，故不具技术上的实质意义，任何结构的修饰、比例关系的改变或大小的调整，在不影响本发明所能产生的功效及所能达成的目的下，均应仍落在本发明所揭示的技术内容能涵盖的范围内。同时，本说明书中所引用的如“上”、“下”、“左”、“右”、“中间”及“一”等的用语，亦仅为便于叙述明了，而非用以限定本发明可实施的范围，其相对关系的改变或调整，在无实质变更技术内容下，当亦视为本发明可实施的范畴。
本申请提供一种集抬压脚和调节线张力于一体的缝纫机。为便于叙述，下述实施例中，各方向的定义如下：将缝纫机中主轴的轴向定义为左右方向，且主轴朝向缝纫机机头(即机针侧)的方向为左方向，主轴朝向缝纫机机尾的方向为右方向；将缝纫机正缝时缝料的移动方向定义为前方向；将与左右方向和前后方向都正交的方向定义为上下方向。
如图1和图2所示，本申请涉及的缝纫机包括机壳10、抬压脚组件、夹线器、安装于机壳10的驱动电机40、以及驱动机构。其中，抬压脚组件包括上下延伸的压杆21、安装在压杆21下端的压脚22、以及固定在压杆21上端的导架23，压杆21可上下移动地安装在缝纫机机壳10中。夹线器包括前后延伸的夹线杆31、都套装在夹线杆31上的夹线片32和夹线弹簧33、以及安装在夹线杆31后端的弹簧限位件34，夹线杆31可前后移动地安装在缝纫机机壳10中，夹线弹簧33前后延伸，夹线弹簧33的前后两端分别与夹线片32和弹簧限位件34抵接，即夹线片32、夹线弹簧33 和弹簧限位件34从前至后依次分布。驱动机构包括由驱动电机40驱动转动的驱动曲柄50、连接在驱动曲柄50和导架23之间的抬压脚离合组件、以及连接在驱动曲柄50和夹线杆31之间的线张力调节离合组件。
特别地，驱动电机40的输出转角具有抬压脚范围和线张力调节范围，线张力调节范围包含对应线张力为零的转角值。当驱动电机40的电机轴在抬压脚范围内转动时，抬压脚离合组件使驱动曲柄50和导架23之间有动力传递，线张力调节离合组件使驱动曲柄50和夹线杆31之间无动力传递；此时，驱动电机40带动驱动曲柄50转动时，通过抬压脚离合组件驱动压杆21上移，压杆21带动压脚22一起上移，执行抬压脚动作，而夹线器不动作、维持当前状态；并且，驱动电机40的输出转角可控，使得压杆21上移的行程也可控，进而使得压脚22抬起的高度也可控，能够将压脚22向上抬起至最高点下的任意高度。当驱动电机40的电机轴在线张力调节范围内转动时，抬压脚离合组件使驱动曲柄50和导架23之间无动力传递，线张力调节离合组件使驱动曲柄50和夹线杆31之间有动力传递；此时，驱动电机40带动驱动曲柄50转动时，通过线张力调节离合组件驱动夹线杆31前移或后移；夹线杆31带动弹簧限位件34前移时，夹线弹簧33的长度减小，夹线弹簧33作用在夹线片32上的压力增加，由此可以使夹线器执行夹线动作、或者增加夹线器施加于面线的夹线力，也即增加面线的线张力；夹线杆31带动弹簧限位件34后移时，夹线弹簧33的长度增加，夹线弹簧33作用在夹线片32上的压力减小，由此可以使夹线器执行松线动作、或者减小夹线器施加于面线的夹线力，也即减小面线的线张力；当夹线弹簧33完全恢复到原始长度时，夹线片32施加于面线的夹线力为零；而抬压脚组件不动作，压脚22维持当前状态。
由上述内容可知：本申请涉及的缝纫机采用同一个驱动电机40可实现自动抬压脚和自动调节线张力，在自动调节线张力时包含执行夹线器的夹线动作和松线动作，在自动抬压脚时能够将压脚22向上抬起至最高点下的任意高度，并且驱动电机40在运转过程中不会产生冲击力。因此，本申请能够降低缝纫机的成本，优化缝纫机的结构，降低压脚22抬起和放下时、调节线张力时、夹线器夹线时、夹线器松线时的噪音、压脚22抬起的高度 可控。优选地，如图2所示，压杆21可上下移动地穿设在一衬套24中，该衬套24固定在机壳10中，压脚22的下方为缝纫机的针板。
较优地，驱动电机40为一步进电机，能够提高控制精度。如图2所示，驱动电机40固定安装在一电机座80上，电机座80再通过螺钉固定安装在机壳10上，进而将驱动电机40安装于机壳10。电机座80上的左侧面上还固定有一轴套90，驱动电机40的电机轴左右延伸、且可转动地支撑在轴套90中，驱动曲柄50固定在驱动电机40的电机轴的左端，驱动电机40直接带动驱动曲柄50转动。
进一步地，当驱动电机40的电机轴在抬压脚范围内转动时，夹线器处于松线状态，此时，夹线器中的夹线弹簧33完全恢复到原始长度，面线的线张力为零。
抬压脚离合组件的优选结构为：如图2和图4所示，抬压脚离合组件包括抬压脚连杆61、具有第一固定摆动支点的抬压脚摇杆62、以及固定于抬压脚连杆61的抬压脚推杆63；抬压脚连杆61的上端通过一左右延伸的轴位螺钉铰接在驱动曲柄50的左端面、且抬压脚连杆61与驱动曲柄50的铰接点偏心于驱动曲柄50的转动中心，驱动曲柄50的转动中心即为驱动电机40的电机轴的转动中心；抬压脚连杆61的下端与抬压脚摇杆62的前端通过一左右延伸的轴位螺钉铰接；抬压脚摇杆62的后端可转动地套装在一左右延伸的第一支撑销64上，该第一支撑销64固定于缝纫机的机壳10，第一支撑销64构成抬压脚摇杆62的第一固定摆动支点；抬压脚推杆63左右延伸，抬压脚推杆63与抬压脚连杆61的固定点位于抬压脚连杆61的中下段处，抬压脚推杆63向左伸出于抬压脚连杆61的这部分位于导架23的下方侧、并能够与导架23相抵接。具体说，当驱动电机40的电机轴在抬压脚范围内转动时，抬压脚推杆63与导架23抵接配合，此时，驱动电机40带动驱动曲柄50转动时，驱动曲柄50通过抬压脚连杆61带动抬压脚推杆63上移，抬压脚推杆63推动导架23一起上移，进而驱动压杆21和压脚22上移，由此执行抬压脚动作。当驱动电机40的电机轴在线张力调节范围内转动时，抬压脚推杆63始终位于导架23的下方、两者分离，此时，驱动电机40带动驱动曲柄50转动时，虽然抬压脚推杆63在运动， 但抬压脚推杆63始终不接触导架23，故导架23维持当前状态，使得抬压脚组件整体维持当前状态。
线张力调节离合组件的优选结构为：如图2、图3和图5所示，线张力调节离合组件包括安装在驱动曲柄50右端面上的滚轮71、具有第二固定摆动支点的驱动杠杆72、以及固定在夹线杆31上的连接接头73；滚轮71偏心于驱动曲柄50的转动中心；驱动杠杆72的上端具有杠杆驱动部721、下端开设有沿驱动杠杆72长度方向延伸的滑槽722；连接接头73包括接头本体部731、以及从接头本体部731的右端向右延伸出的连接轴部732，夹线杆31的前端固定在接头本体部731中，连接轴部732穿设在驱动杠杆72下端的滑槽722中、且两者滑动配合。当驱动电机40的电机轴在抬压脚范围内转动时，驱动杠杆72的杠杆驱动部721与滚轮71相分离，此时，驱动电机40带动驱动曲柄50转动时，驱动杠杆72不动作，故夹线杆31也不会移动、维持当前状态，使得夹线器整体维持当前状态。当驱动电机40的电机轴在线张力调节范围内转动时，驱动杠杆72的杠杆驱动部721与滚轮71抵接配合，此时，驱动电机40带动驱动曲柄50转动时，驱动曲柄50通过滚轮71使驱动杠杆72绕其第二固定摆动支点转动，进而通过连接接头73驱动夹线杆31前移或右移，由此调节线张力、或使夹线器执行夹线动作、或使夹线器执行松线动作。
较优地，如图2和图5所示，轴承的左端面上固定有一左右延伸的第二支撑销74，驱动杠杆72可转动地套装在该第二支撑销74上，该第二支撑销74构成驱动杠杆72的第二固定摆动支点。第二支撑销74还设有卡簧75，卡簧75和轴承相配合，在左右方向上对驱动杠杆72进行限位。如图5所示，夹线器还包括固定于缝纫机机壳10的夹线座35，由此将夹线器整体安装于缝纫机的机壳10；夹线杆31可前后移动地穿设在夹线座35中，夹线片32有两个、前后相对设置，两个夹线片32之间形成有夹线腔，位于前侧的夹线片32与夹线座35的前端面抵接，位于后侧的夹线片32与夹线弹簧33的后端抵接。
进一步地，弹簧限位件34有下述两种实施例。弹簧限位件34实施例一、弹簧限位件34为一旋钮，旋钮和夹线杆31之间为分体结构、且两者 间的连接方式有下述两种，方式一、两者固定连接，旋钮直接固定在夹线杆31的后端，此时，只能通过驱动电机40自动调节线张力；方式二、两者螺纹连接，旋钮螺纹连接在弹簧限位件34，此时，除了通过驱动电机40自动调节线张力外，还可以手动转动旋钮来手动调节线张力。弹簧限位件34实施例二、弹簧限位件34为一帽檐部，该帽檐部一体地形成在夹线杆31的后端，即弹簧限位件34与夹线杆31之间为一体结构，此时，只能通过驱动电机40自动调节线张力。
具有上述结构的缝纫机的工作原理如下：
缝纫机开机通电后，缝纫机的电控模块控制驱动电机40通电；缝纫机开始缝纫时，缝纫机的电控模块控制驱动电机40的输出转角为线张力调节范围内的一转角值，夹线弹簧33处于被压缩的状态，夹线弹簧33向后侧的夹线片32施加压力，由此使面线具有线张力。
需要增大面线的线张力时，驱动电机40的电机轴逆时针转动，带动驱动曲柄50一起逆时针转动，使滚轮71后移，进而向后推动驱动杠杆72上端的杠杆驱动部721，则驱动杠杆72绕第二支撑销74顺时针摆动，通过连接接头73带动夹线杆31前移，夹线杆31带动其后端的弹簧限位件34一起前移，进一步压缩夹线弹簧33，夹线弹簧33对后侧夹线片32施加的压力增加，由此增加面线的线张力。
需要减小面线的线张力、以及松线时，驱动电机40的电机轴顺时针转动，带动驱动曲柄50一起顺时针转动，使滚轮71前移，则驱动杠杆72绕第二支撑销74逆时针摆动，通过连接接头73带动夹线杆31后移，夹线杆31带动其后端的弹簧限位件34一起后移，夹线弹簧33伸长，夹线弹簧33对后侧夹线片32施加的压力减小，由此减小面线的线张力。随着夹线杆31的继续后移，夹线弹簧33完全恢复到原始长度，则夹线片32施加于面线的夹线力为零，也即为夹线器执行松线动作。之后，驱动电机40的电机轴继续顺时针转动，滚轮71脱离于驱动杠杆72上端的杠杆驱动部721，此后可开始进行抬压脚。
需要抬压脚时，驱动电机40的电机轴顺时针转动至抬压脚范围内的一转角值，此过程中，驱动曲柄50通过抬压脚连杆61驱动抬压脚推杆63 上移，抬压脚推杆63与导架23抵接、推动导架23和压杆21上移，抬起压脚22。随着驱动电机40的电机轴在抬压脚范围内位于不同的角度，压脚22向上抬起的高度不相同，由此具有多个抬压脚高度。
因此，本申请通过缝纫机电控模块对驱动电机40的控制，能够进行夹线器的夹线动作、松线动作、以及线张力调节，同时还能实现自动抬压脚、以及抬压脚高度的可控，压脚22抬起和放下时都不会产生撞击，降低缝纫机运行期间的噪音。
综上所述，本发明有效克服了现有技术中的种种缺点而具高度产业利用价值。
上述实施例仅例示性说明本发明的原理及其功效，而非用于限制本发明。任何熟悉此技术的人士皆可在不违背本发明的精神及范畴下，对上述实施例进行修饰或改变。因此，举凡所属技术领域中具有通常知识者在未脱离本发明所揭示的精神与技术思想下所完成的一切等效修饰或改变，仍应由本发明的权利要求所涵盖。

Claims (8)

  1. 一种集抬压脚和调节线张力于一体的缝纫机，其特征在于：所述缝纫机包括：
    抬压脚组件：包括可上下移动的压杆(21)、安装在压杆(21)下端的压脚(22)、以及固定在压杆(21)上的导架(23)；
    夹线器：包括可轴向移动的夹线杆(31)、套装在夹线杆(31)上的夹线片(32)和夹线弹簧(33)、以及设置在夹线杆(31)上的弹簧限位件(34)，所述夹线弹簧(33)的两端与夹线片(32)和弹簧限位件(34)抵接；
    驱动电机(40)；
    驱动机构：包括由所述驱动电机(40)驱动转动的驱动曲柄(50)、连接在驱动曲柄(50)和导架(23)之间的抬压脚离合组件、以及连接在驱动曲柄(50)和夹线杆(31)之间的线张力调节离合组件；
    所述驱动电机(40)的输出转角具有抬压脚范围和线张力调节范围；当所述驱动电机(40)的电机轴在抬压脚范围内转动时，所述抬压脚离合组件使驱动曲柄(50)和导架(23)之间有动力传递，所述线张力调节离合组件使驱动曲柄(50)和夹线杆(31)之间无动力传递；当所述驱动电机(40)的电机轴在线张力调节范围内转动时，所述抬压脚离合组件使驱动曲柄(50)和导架(23)之间无动力传递，所述线张力调节离合组件使驱动曲柄(50)和夹线杆(31)之间有动力传递。
  2. 根据权利要求1所述的缝纫机，其特征在于：当所述驱动电机(40)的电机轴在抬压脚范围内转动时，所述夹线器处于松线状态。
  3. 根据权利要求1所述的缝纫机，其特征在于：所述抬压脚离合组件包括抬压脚连杆(61)、具有第一固定摆动支点的抬压脚摇杆(62)、以及固定于抬压脚连杆(61)的抬压脚推杆(63)，所述抬压脚连杆(61)的两端分别与驱动曲柄(50)和抬压脚摇杆(62)铰接、且抬压脚连杆(61)与驱动曲柄(50)的铰接点偏心于驱动曲柄(50)的转动中心；当所述驱动电机(40)的电机轴在抬压脚范围内转动时，所述抬压脚推杆(63)与导架(23)抵接配合；当所述驱动电机(40)的电机轴在线张力调节范围内转动时，所述抬压脚推杆(63)位于导架(23)的下方、两者分离。
  4. 根据权利要求1所述的缝纫机，其特征在于：所述线张力调节离合组件包括安装在驱动曲柄(50)上的滚轮(71)、具有第二固定摆动支点的驱动杠杆(72)、以及固定在夹线杆(31)上的连接接头(73)，所述驱动杠杆(72)的一端具有杠杆驱动部(721)、另一端开设有沿驱动杠杆(72)长度方向延伸的滑槽(722)，所述连接接头(73)上具有连接轴部(732)，所述连接轴部(732)穿设在滑槽(722)中、两者滑动配合；当所述驱动电机(40)的电机轴在抬压脚范围内转动时，所述驱动杠杆(72)的杠杆驱动部(721)与滚轮(71)相分离；当所述驱动电机(40)的电机轴在线张力调节范围内转动时，所述驱动杠杆(72)的杠杆驱动部(721)与滚轮(71)抵接配合。
  5. 根据权利要求1所述的缝纫机，其特征在于：所述驱动电机(40)为一步进电机。
  6. 根据权利要求1所述的缝纫机，其特征在于：所述夹线器还包括固定于缝纫机机壳(10)的夹线座(35)，所述夹线杆(31)可移动地穿设在夹线座(35)中，所述夹线片(32)有两个、且两个夹线片(32)之间形成有夹线腔，其中一个夹线片(32)与所述夹线座(35)抵接、另一个夹线片(32)与所述夹线弹簧(33)抵接。
  7. 根据权利要求1所述的缝纫机，其特征在于：所述弹簧限位件(34)为一旋钮，所述旋钮与夹线杆(31)之间为分体结构，所述夹线杆(31)与旋钮固定连接或螺纹连接。
  8. 根据权利要求1所述的缝纫机，其特征在于：所述弹簧限位件(34)为一帽檐部，所述帽檐部一体地形成在所述夹线杆(31)上。
PCT/CN2020/105352 2020-05-15 2020-07-29 一种集抬压脚和调节线张力于一体的缝纫机 WO2021227260A1 (zh)

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