WO2022135161A1 - 一种缝纫机的剪线机构 - Google Patents
一种缝纫机的剪线机构 Download PDFInfo
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- WO2022135161A1 WO2022135161A1 PCT/CN2021/136682 CN2021136682W WO2022135161A1 WO 2022135161 A1 WO2022135161 A1 WO 2022135161A1 CN 2021136682 W CN2021136682 W CN 2021136682W WO 2022135161 A1 WO2022135161 A1 WO 2022135161A1
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- Prior art keywords
- thread trimming
- shaft
- worm
- trimming mechanism
- sewing machine
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- 238000009966 trimming Methods 0.000 title claims abstract description 63
- 238000009958 sewing Methods 0.000 title claims abstract description 43
- 230000033001 locomotion Effects 0.000 claims abstract description 12
- 238000009434 installation Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000010008 shearing Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
Definitions
- the utility model belongs to the technical field of sewing machines, and relates to a thread trimming mechanism of a sewing machine.
- the thread trimming mechanism is a very important part of the sewing machine, and it is a typical representative of the automation of the sewing machine; the initial thread trimming of the industrial sewing machine is done manually, which greatly affects the production efficiency of the sewing machine; with the development of the sewing machine to the In the era of computerized cars, the automatic thread trimming function has almost become a standard feature.
- the automation of sewing machines has been improved, and the production efficiency of sewing machines has also been improved.
- a Chinese patent discloses a sewing machine thread trimming mechanism and a sewing machine including the thread trimming mechanism.
- the fixed knife of the thread trimming mechanism is fixed on the sewing machine casing; its power
- the mechanism is the lower shaft of the sewing machine, and a rotating part is fixed on the lower shaft;
- the movable knife is installed on the movable knife rest, and the movable knife rest is rotatably arranged in the sewing machine casing;
- the transmission mechanism includes gear 1, gear 2, crank and Connecting rod; gear set is set on the lower shaft, which is located on one side of the rotating part and can rotate relative to the lower shaft;
- the external teeth of gear one mesh with the external teeth of gear two, the crank is connected with gear two through the crank shaft, and one end of the connecting rod is connected to the gear two.
- the crank is connected, and the other end is connected with the movable tool rest;
- the first gear and the rotating member are correspondingly provided with a matching engaging structure, which is used for mutual engagement and separation under the
- the thread trimming mechanism of the sewing machine disclosed in the above-mentioned patent documents and the thread trimming mechanism in the sewing machine including the thread trimming mechanism are relatively complex in structure, resulting in a large thread trimming error, and the thread trimming accuracy cannot be guaranteed.
- the utility model provides a thread trimming mechanism of a sewing machine.
- the technical problem to be solved by the utility model is: how to simplify the thread trimming mechanism and improve the thread trimming accuracy.
- a thread trimming mechanism of a sewing machine the sewing machine includes a base, characterized in that the thread trimming mechanism includes a motor fixed on the base, a worm gear arranged on the output shaft of the motor, and a worm gear mutually connected to the worm gear.
- a working worm and a moving knife rotatably connected to the machine base are provided with a connecting rod between the worm and the moving knife, and the rotation of the worm can make the connecting rod drive the moving knife to swing.
- the rotation of the output shaft of the motor can drive the worm wheel to rotate, the worm wheel rotates due to the interaction between the worm wheel and the worm, and the rotation of the worm drives the connecting rod to move, and the moving knife swings due to the movement of the connecting rod to cut the wire;
- the motor is controlled separately by electronic control, which is more convenient to operate and debug.
- the entire thread trimming mechanism simplifies the traditional thread trimming structure and innovates on the traditional basis.
- the thread trimming mechanism has a simple structure and can effectively reduce the thread trimming rate. The accuracy of thread trimming is improved, the production cost is reduced, and the production efficiency of the sewing machine is improved.
- a crank is fixed on the worm, a rotatable movable knife rest is provided in the base, the movable knife is fixed on the movable knife rest, and the connecting rod Both ends of the crank are respectively connected with the crank and the moving tool rest.
- the rotation of the worm drives the crank to swing, and the connecting rod moves due to the swing of the crank, thereby driving the moving tool holder to rotate, thereby enabling the moving knife to realize the thread-cutting motion.
- the crank and connecting rod are relatively common transmission parts, which are very convenient for installation and maintenance.
- a shaft hole 1 is opened in the base, a shaft sleeve is arranged in the shaft hole 1, and a middle part of one end of the shaft sleeve has a shaft portion extending out of the shaft hole 1 , the movable tool rest is arranged in the shape of a pie, and a through hole is opened in the middle for the shaft portion to pass through, and the outer peripheral side of the movable tool rest has a protruding portion, and the protruding portion is far away from the shaft hole
- One side of one has a mounting portion extending outward, one end of the movable knife is fixed on the outside of the mounting portion, the middle part to the other end of the moving knife protrudes from the mounting portion, and one end of the moving knife protrudes from the mounting portion.
- the middle part of the side to the other end has a cutting edge part for thread trimming.
- the protruding part and the mounting part are arranged to facilitate the installation of the moving knife on the moving knife holder, so that the setting of the moving knife will not affect the action of the moving knife holder; It is beneficial to improve the efficiency and accuracy of thread trimming.
- a side of the outer periphery of the movable knife holder away from the protruding portion has a connecting portion extending outward, and one end of the connecting rod and the end portion of the connecting portion pass through an axial position Connect the screws.
- a connecting part is provided on the movable tool rest to facilitate the connection between the movable tool rest and the connecting rod. The position of the connecting part in the movable tool rest makes the force of the movable tool rest on the relative position of the shaft relatively consistent, which can reduce the wear of the shaft. It can prolong the service life of the shaft and the shaft sleeve.
- a cover plate for restricting the axial movement of the movable knife rest is fixed on the end surface of the shaft portion.
- the cover plate plays the role of limiting the movable tool rest, which can improve the stability of the movable tool rest on the shaft and ensure that the thread trimming movement can be carried out normally.
- the second shaft hole and the third shaft hole are relatively opened in the base
- the worm has a polished rod part 1 and a polished rod part 2 located at both ends
- the polished rod part 1 is provided with Bearing
- the bearing is located in the second shaft hole
- the polished rod part 2 is provided with a support sleeve located in the third shaft hole
- the crank is fixed on the polished rod part 2
- the connecting rod is far away from the One end of the movable tool rest is connected with the crank through the second shaft screw.
- the worm is positioned in the machine base through the bearing and the support sleeve, so that the worm can rotate freely under the action of the worm wheel, and the crank is used to convert the rotational motion of the worm into the reciprocating motion of the connecting rod, so as to realize the cutting action of the moving knife, which is very simple and convenient. practical.
- the motor is fixed on the outside of the base, the side of the base is provided with a mounting hole for the output shaft of the motor to pass through, and the worm gear is located on the side of the base.
- the seat is fixed on the end of the output shaft of the motor, and the output shaft of the motor is perpendicular to the worm.
- the worm gear is directly fixed on the end of the output shaft of the motor, which facilitates the installation of the worm gear and the positioning of the worm.
- the motor in the utility model drives the worm to rotate through the worm gear, and then uses the crank to convert the rotation into the reciprocating movement of the connecting rod, and then drives the movable knife rest and the movable knife to swing, thereby realizing the wire-cutting movement of the movable knife.
- the structure of the thread trimming mechanism is relatively simple, and the motor is independently controlled by electronic control, so that the error of the moving knife is small when trimming the thread, thereby improving the accuracy of the thread trimming.
- FIG. 1 is a schematic three-dimensional structure diagram of the thread trimming mechanism of the sewing machine.
- Figure 2 is a schematic diagram of the structure of the base in the thread trimming mechanism of the sewing machine.
- Figure 3 is a schematic structural diagram of the thread trimming mechanism in the thread trimming mechanism of the sewing machine.
- Fig. 4 is an exploded view of the thread trimming mechanism in the thread trimming mechanism of the sewing machine.
- Fig. 5 is a partial exploded view of the thread trimming mechanism in the thread trimming mechanism of the sewing machine.
- the sewing machine in this embodiment includes a machine base 1, the thread trimming mechanism includes a motor 2, a worm wheel 3, a worm 4, a connecting rod 6, a movable knife rest 8 and a movable knife 5, and the motor 2 is fixed On the outside of the base 1, the side of the base 1 is provided with a mounting hole for the output shaft of the motor 2 to pass through, the worm wheel 3 is located in the base 1, the worm wheel 3 is fixed on the end of the output shaft of the motor 2, and the worm 4 is located in the base.
- the worm gear 3 is arranged on one side of the worm 4, the worm 4 is perpendicular to the output shaft of the motor 2, the machine base 1 is provided with a shaft hole 1a, and the shaft hole 1a is provided with a shaft sleeve 9, and the shaft sleeve 9 is provided with a shaft sleeve 9.
- One end has a shaft portion 9a protruding from the shaft hole 1a in the middle, the movable tool holder 8 is arranged in the shape of a round cake, and the middle portion has a through hole 8a for the shaft portion 9a to pass through.
- the cover plate 11 for the axial movement of the tool holder 8 has a protruding portion 8b on the outer peripheral side of the movable tool holder 8.
- the side of the protruding portion 8b away from the shaft hole 1a has an outwardly extending mounting portion 8c.
- One end of the movable knife 5 It is fixed on the outside of the mounting portion 8c, the middle part to the other end of the movable knife 5 protrudes from the mounting portion 8c, and the middle part to the other end of the movable knife 5 has a cutting edge portion 5a for thread trimming.
- the side away from the protruding portion 8b has a connecting portion 8d extending outward.
- the machine base 1 is also provided with relative shaft holes 2 1b and 3 1c, the shaft hole 2 1b is provided with a bearing 12, and the shaft hole 3 1c is provided with a support sleeve.
- the worm 4 has a polished rod part one 4a and a polished rod part two 4b at both ends, the polished rod part one 4a is arranged in the middle part of one side of the bearing 12, the support sleeve 13 is sleeved on the polished rod part two 4b, and the polished rod part two 4b
- a crank 7 is also provided, one end of the crank 7 is fixed on the second polished rod part 4b and the other end is connected with the other end of the connecting rod 6 through the second axial screw 14 .
- the output shaft of the motor 2 drives the worm wheel 3 located at the end of the output shaft to rotate, the interaction between the worm wheel 3 and the worm 4 will drive the worm 4 to rotate, and the crank 7 swings accordingly, which in turn drives the connecting rod 6 toward the moving knife
- the frame 8 and the direction away from the movable tool rest 8 reciprocate, so the movable tool rest 8 can be driven to rotate on the shaft portion 9a of the shaft sleeve 9, and then the movable tool 5 fixed on the movable tool rest 8 swings, and the movable tool 5 and the movable tool rest 8 swing.
- the fixed knife cooperates to form a cutting action, so as to carry out the thread trimming movement.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
一种缝纫机的剪线机构，属于缝纫机技术领域。它解决了剪线机构结构复杂导致剪线精度差等技术问题。本缝纫机包括机座（1），剪线机构包括固设在机座（1）上的电机（2）、设置在电机（2）输出轴上的蜗轮（3）、与蜗轮（3）相互作用的蜗杆（4）以及转动连接在机座（1）上的动刀（5），蜗杆（4）和动刀（5）之间设有连杆（6），蜗杆（4）转动能使连杆（6）带动动刀（5）摆动并与定刀配合形成剪切运动。该剪线机构的结构较为简单，从而降低了剪线误差，提高了剪线的精准度。
Description
本实用新型属于缝纫机技术领域，涉及一种缝纫机的剪线机构。
剪线机构是缝纫机中很重要的组成部分，它是缝纫机走向自动化的一个典型代表；工业缝纫机最初的剪线是通过人工完成的，这极大的影响了缝纫机的生产效率；随着缝纫机发展到电脑车时代，自动剪线功能几乎成了标配，缝纫机自动化程度提高的同时缝纫机的生产效率也得到提升。
我国专利（公告号：CN107142624B；公告日：2020-10-09）公开了一种缝纫机剪线机构及包含该剪线机构的缝纫机，该剪线机构的定刀固定在缝纫机机壳上；其动力机构为缝纫机的下轴，下轴上固定有转动件；其动刀安装在动刀架上，动刀架可转动地设置在缝纫机机壳内；其传动机构包括齿轮一、齿轮二、曲柄和连杆；齿轮一套设在下轴上，位于转动件的一侧，可相对下轴转动；齿轮一的外齿和齿轮二的外齿啮合，曲柄通过曲柄轴与齿轮二连接，连杆一端与曲柄连接，另一端与动刀架连接；齿轮一和转动件对应设置有相配合的接合结构，用于在离合机构作用下相互接合与分离。
上述专利文献公开的缝纫机剪线机构及包含该剪线机构的缝纫机中剪线机构的结构比较复杂，导致剪线误差较大，剪线精度无法保证。
本实用新型针对现有的技术存在的上述问题，提供一种缝纫机的剪线机构，本实用新型所要解决的技术问题是：如何简化剪线机构，提高剪线精准度。
本实用新型的目的可通过下列技术方案来实现。
一种缝纫机的剪线机构，缝纫机包括机座，其特征在于，所述剪线机构包括固设在所述机座上的电机、设置在所述电机输出轴上的蜗轮、与所述蜗轮相互作用的蜗杆以及转动连接在所述机座上的动刀，所述蜗杆和所述动刀之间设有连杆，所述蜗杆转动能使所述连杆带动所述动刀摆动。
其工作原理如下：本技术方案中电机的输出轴转动能带动蜗轮转动，由于蜗轮与蜗杆相互作用从而使蜗杆转动，蜗杆转动带动连杆移动，动刀因连杆移动而摆动能将线剪断；电机是电控单独控制的，操作和调试都更加方便，整个剪线机构将传统的剪线结构进行了简化且在传统的基础上进行了创新，本剪线机构结构简单，可以有效降低剪线的误差，提高了剪线的精准度，并且降低了生产的成本，提高了缝纫机的生产效率。
在上述的缝纫机的剪线机构中，所述蜗杆上固设有曲柄，所述机座内设有能够转动的动刀架，所述动刀固定在所述动刀架上，所述连杆的两端分别与所述曲柄和所述动刀架相连。蜗杆转动带动曲柄摆动，连杆因曲柄摆动而移动，从而带动动刀架转动，进而使动刀实现剪线运动，曲柄和连杆都是比较常见的传动件，安装和检修都非常方便。
在上述的缝纫机的剪线机构中，所述机座内开有轴孔一，所述轴孔一内设有轴套，所述轴套的一端中部具有伸出所述轴孔一的轴部，所述动刀架呈圆饼状设置且中部开有供所述轴部穿设的通孔，所述动刀架的外周一侧具有凸出部，所述凸出部远离所述轴孔一的一侧具有向外延伸的安装部，所述动刀的一端固定在所述安装部外侧，所述动刀的中部至另一端均凸出于所述安装部且所述动刀的一侧中部至另一端具有用于剪线的刀刃部。设置凸出部和安装部，便于将动刀安装在动刀架上，使动刀的设置不会影响动刀架的动作，动刀的刀刃部设置在动刀凸出于安装部的位置，有利于提高剪线的效率和精准度。
在上述的缝纫机的剪线机构中，所述动刀架外周远离所述凸出部的一侧具有向外延伸的连接部，所述连杆的一端与所述连接部的端部通过轴位螺钉一相连。动刀架上设置连接部，便于动刀架与连杆的连接，连接部在动刀架的位置使动刀架对轴部上相对位置的作用力比较一致，可以减小轴部的磨损，能延长轴部以及轴套的使用寿命。
在上述的缝纫机的剪线机构中，所述轴部的端面上固设有用于限制所述动刀架轴向移动的盖板。盖板起到限位动刀架的作用，能提高动刀架在轴部上的稳定性，保证剪线运动能正常进行。
在上述的缝纫机的剪线机构中，所述机座内相对开有轴孔二和轴孔三，所述蜗杆上具有位于两端的光杆部一和光杆部二，所述光杆部一上设有轴承，所述轴承位于所述轴孔二内，所述光杆部二上设有位于所述轴孔三内的支承套，所述曲柄固设在所述光杆部二上，所述连杆远离所述动刀架的一端与所述曲柄通过轴位螺钉二相连。蜗杆通过轴承和支承套定位在机座内，使蜗杆在蜗轮的作用下能自由转动，利用曲柄将蜗杆的转动运动转换成连杆的往复运动，从而实现动刀的剪线动作，非常简便且实用。
在上述的缝纫机的剪线机构中，所述电机固定在所述机座的外侧，所述机座侧面上开有供所述电机的输出轴穿设的安装孔，所述蜗轮位于所述机座内且固定在所述电机的输出轴端部，所述电机的输出轴与所述蜗杆相垂直。蜗轮直接固定在电机的输出轴端部，为蜗轮的安装和蜗杆的定位提供了便利。
与现有技术相比，本实用新型中的电机通过蜗轮驱动蜗杆转动，再利用曲柄将转动转换成连杆的往复移动，进而驱动动刀架和动刀摆动，从而实现动刀的剪线运动，剪线机构的结构比较简单，并且电机是电控单独控制的，使动刀剪线时误差较小，从而提高了剪线的精准度。
图1是本缝纫机的剪线机构的立体结构示意图。
图2是本缝纫机的剪线机构中机座的结构示意图。
图3是本缝纫机的剪线机构中剪线机构的结构示意图。
图4是本缝纫机的剪线机构中剪线机构的爆炸图。
图5是本缝纫机的剪线机构中剪线机构的局部爆炸图。
图中，1、机座；1a、轴孔一；1b、轴孔二；1c、轴孔三；2、电机；3、蜗轮；4、蜗杆；4a、光杆部一；4b、光杆部二；5、动刀；5a、刀刃部；6、连杆；7、曲柄；8、动刀架；8a、通孔；8b、凸出部；8c、安装部；8d、连接部；9、轴套；9a、轴部；10、轴位螺钉一；11、盖板；12、轴承；13、支承套；14、轴位螺钉二。
以下是本实用新型的具体实施例并结合附图，对本实用新型的技术方案作进一步的描述，但本实用新型并不限于这些实施例。
如图1至图5所示，本实施例中的缝纫机包括机座1，剪线机构包括电机2、蜗轮3、蜗杆4、连杆6、动刀架8和动刀5，电机2固设在机座1的外侧，机座1侧面开有供电机2的输出轴穿设的安装孔，蜗轮3位于机座1内，蜗轮3固定在电机2的输出轴端部，蜗杆4位于机座1内，蜗轮3设置在蜗杆4的一侧，蜗杆4与电机2的输出轴相垂直，机座1内开有轴孔一1a，轴孔一1a内设有轴套9，轴套9的一端中部具有伸出轴孔一1a的轴部9a，动刀架8呈圆饼状设置且中部开有供轴部9a穿设的通孔8a，轴部9a的端部固设有用于限制动刀架8轴向移动的盖板11，动刀架8外周一侧具有凸出部8b，凸出部8b远离轴孔一1a的一侧具有向外延伸的安装部8c，动刀5的一端固设在安装部8c的外侧，动刀5的中部至另一端均凸出于安装部8c且动刀5一侧的中部至另一端具有用于剪线的刀刃部5a，动刀架8外周远离凸出部8b的一侧具有向外延伸的连接部8d，连杆6的一端与连接部8d的端部通过轴位螺钉一10相连。
进一步的，如图1至图4所示，机座1内还开有相对的轴孔二1b和轴孔三1c，轴孔二1b内设有轴承12，轴孔三1c内设有支承套13，蜗杆4上具有位于两端的光杆部一4a和光杆部二4b，光杆部一4a穿设在轴承12的一侧中部，支承套13套设在光杆部二4b上，光杆部二4b上还设有曲柄7，曲柄7的一端固定在光杆部二4b上且另一端通过轴位螺钉二14与连杆6的另一端相连。
开启电机2，电机2的输出轴正反转带动位于输出轴端部的蜗轮3转动，蜗轮3与蜗杆4相互作用会带动蜗杆4转动，曲柄7随之摆动，进而带动连杆6朝向动刀架8以及远离动刀架8的方向往复移动，因此可以带动动刀架8在轴套9的轴部9a上转动，进而使固定在动刀架8上的动刀5摆动，动刀5与定刀配合形成剪切动作，从而进行剪线运动。
本文中所描述的具体实施例仅仅是对本发明精神作举例说明。本发明所属技术领域的技术人员可以对所描述的具体实施例做各种各样的修改或补充或采用类似的方式替代，但并不会偏离本发明的精神或者超越所附权利要求书所定义的范围。
Claims (7)
- 一种缝纫机的剪线机构，缝纫机包括机座（1），其特征在于，所述剪线机构包括固设在所述机座（1）上的电机（2）、设置在所述电机（2）输出轴上的蜗轮（3）、与所述蜗轮（3）相互作用的蜗杆（4）以及转动连接在所述机座（1）上的动刀（5），所述蜗杆（4）和所述动刀（5）之间设有连杆（6），所述蜗杆（4）转动能使所述连杆（6）带动所述动刀（5）摆动。
- 根据权利要求1所述的缝纫机的剪线机构，其特征在于，所述蜗杆（4）上固设有曲柄（7），所述机座（1）内设有能够转动的动刀架（8），所述动刀（5）固定在所述动刀架（8）上，所述连杆（6）的两端分别与所述曲柄（7）和所述动刀架（8）相连。
- 根据权利要求2所述的缝纫机的剪线机构，其特征在于，所述机座（1）内开有轴孔一（1a），所述轴孔一（1a）内设有轴套（9），所述轴套（9）的一端中部具有伸出所述轴孔一（1a）的轴部（9a），所述动刀架（8）呈圆饼状设置且中部开有供所述轴部（9a）穿设的通孔（8a），所述动刀架（8）的外周一侧具有凸出部（8b），所述凸出部（8b）远离所述轴孔一（1a）的一侧具有向外延伸的安装部（8c），所述动刀（5）的一端固定在所述安装部（8c）外侧，所述动刀（5）的中部至另一端均凸出于所述安装部（8c）且所述动刀（5）的一侧中部至另一端具有用于剪线的刀刃部（5a）。
- 根据权利要求3所述的缝纫机的剪线机构，其特征在于，所述动刀架（8）外周远离所述凸出部（8b）的一侧具有向外延伸的连接部（8d），所述连杆（6）的一端与所述连接部（8d）的端部通过轴位螺钉一（10）相连。
- 根据权利要求3或4所述的缝纫机的剪线机构，其特征在于，所述轴部（9a）的端面上固设有用于限制所述动刀架（8）轴向移动的盖板（11）。
- 根据权利要求4所述的缝纫机的剪线机构，其特征在于，所述机座（1）内相对开有轴孔二（1b）和轴孔三（1c），所述蜗杆（4）上具有位于两端的光杆部一（4a）和光杆部二（4b），所述光杆部一（4a）上设有轴承（12），所述轴承（12）位于所述轴孔二（1b）内，所述光杆部二（4b）上设有位于所述轴孔三（1c）内的支承套（13），所述曲柄（7）固设在所述光杆部二（4b）上，所述连杆（6）远离所述动刀架（8）的一端与所述曲柄（7）通过轴位螺钉二（14）相连。
- 根据要求1所述的缝纫机的剪线机构，其特征在于，所述电机（2）固定在所述机座（1）的外侧，所述机座（1）侧面上开有供所述电机（2）的输出轴穿设的安装孔，所述蜗轮（3）位于所述机座（1）内且固定在所述电机（2）的输出轴端部，所述电机（2）的输出轴与所述蜗杆（4）相垂直。
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