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CN106868735B - An automatic thread trimming mechanism and sewing machine - Google Patents

An automatic thread trimming mechanism and sewing machine Download PDF

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Publication number
CN106868735B
CN106868735B CN201710212222.3A CN201710212222A CN106868735B CN 106868735 B CN106868735 B CN 106868735B CN 201710212222 A CN201710212222 A CN 201710212222A CN 106868735 B CN106868735 B CN 106868735B
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China
Prior art keywords
thread trimming
crank
cam
thread
shaft
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CN106868735A (en
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柯祥林
祝书伟
郑吉�
何明金
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Jack Technology Co Ltd
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Jack Technology Co Ltd
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    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B65/00Devices for severing the needle or lower thread
    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B69/00Driving-gear; Control devices
    • D05B69/02Mechanical drives
    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05DINDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2207/00Use of special elements
    • D05D2207/05Magnetic devices

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

Abstract

The invention provides an automatic thread trimming mechanism, which comprises a lower shaft, a thread trimming driving cam, a movable cutter assembly, a thread trimming shaft, a thread trimming cam crank and a thread trimming crank, wherein the lower shaft is rotatably supported in a bottom plate of a sewing machine; during trimming, the ball is matched with the trimming cam profile surface on the periphery of the trimming driving cam, and the trimming cam crank, the trimming shaft and the trimming crank swing synchronously. This application has simplified the structure of automatic thread trimmer mechanism, can drive through one-level transmission and move the sword around the swing of lower shaft, with the stationary knife interlock, realize automatic thread trimming, compare with prior art, this application has simplified the driving chain of automatic thread trimmer mechanism to reduce cost.

Description

一种自动剪线机构及缝纫机An automatic thread trimming mechanism and sewing machine

技术领域technical field

本发明涉及一种服装缝制设备,特别是涉及一种自动剪线机构、以及具有该自动剪线机构的缝纫机。The present invention relates to a garment sewing equipment, in particular to an automatic thread trimming mechanism and a sewing machine with the automatic thread trimming mechanism.

背景技术Background technique

目前,缝纫机(特别是平缝机)上配置有自动剪线机构,用于在每次缝纫结束后在旋梭处将底线和面线剪断。如图1和图2所示,现有的缝纫机中自动剪线机构一般包括可转动的下轴100、固定在下轴100上的凸轮200、与下轴100相平行的剪线传动轴300、固定在剪线传动轴300上的剪线驱动组件400、与下轴100相平行且一端具有传动曲柄部的剪线凸轮曲柄轴500、固定在剪线凸轮曲柄轴500另一端的剪线曲柄600、剪线连杆700、动刀架800、固定在动刀架800上的动刀900、以及固定在缝纫机底板下端面上的定刀110,其中,剪线驱动组件400上具有与凸轮200相配合的滚珠、以及与传动曲柄部相铰接的驱动部,剪线连杆700的两端分别与剪线曲柄600和动刀架800相铰接。因此,上述自动剪线机构的工作原理为:如图1至图3所示,需要剪线时,滚珠与凸轮200相配合,下轴100带动凸轮200同步转动,通过滚珠与凸轮200的配合关系驱动剪线驱动组件400和剪线传动轴300摆动,其为一级传动;再通过剪线驱动组件400与传动曲柄部的铰接关系驱动传动曲柄部、剪线凸轮曲柄轴500和剪线曲柄600摆动,其为二级传动;最后,剪线曲柄600通过剪线连杆700驱动动刀架800和动刀900摆动,使动刀900与定刀110相咬合将底线和面线剪断,实现自动剪线。上述现有的自动剪线机构传动链冗余,结构复杂,且剪线驱动组件与剪线凸轮曲柄轴零件复杂,加工成本高。At present, sewing machines (especially lockstitch machines) are equipped with an automatic thread trimming mechanism, which is used to cut the lower thread and the upper thread at the hook after each sewing. As shown in FIG. 1 and FIG. 2 , the automatic thread trimming mechanism in the existing sewing machine generally includes a rotatable lower shaft 100, a cam 200 fixed on the lower shaft 100, a thread trimming drive shaft 300 parallel to the lower shaft 100, and a fixed thread trimming drive shaft 300. The thread trimming drive assembly 400 on the thread trimming drive shaft 300, the thread trimming cam crank shaft 500 parallel to the lower shaft 100 and having a transmission crank part at one end, the thread trimming crank 600 fixed on the other end of the thread trimming cam crank shaft 500, The thread trimming link 700, the movable knife rest 800, the movable knife 900 fixed on the movable knife rest 800, and the fixed knife 110 fixed on the lower end surface of the bottom of the sewing machine, wherein the thread trimming drive assembly 400 has a cam 200 that cooperates with it. The two ends of the thread trimming link 700 are hinged with the thread trimming crank 600 and the moving tool rest 800 respectively. Therefore, the working principle of the above-mentioned automatic thread trimming mechanism is as follows: as shown in FIGS. 1 to 3 , when thread trimming is required, the balls cooperate with the cam 200 , the lower shaft 100 drives the cam 200 to rotate synchronously, and through the matching relationship between the ball and the cam 200 Drive the thread trimmer drive assembly 400 and the thread trimmer drive shaft 300 to swing, which is a primary transmission; then drive the drive crank portion, the thread trimmer cam crank shaft 500 and the thread trimmer crank 600 through the hinged relationship between the thread trimmer drive assembly 400 and the transmission crank portion Swing, which is a secondary transmission; finally, the thread trimming crank 600 drives the movable knife holder 800 and the movable knife 900 to swing through the thread trimming link 700, so that the movable knife 900 engages with the fixed knife 110 to cut the bottom thread and the upper thread, and realizes automatic Trimming. The above-mentioned existing automatic wire trimming mechanism has redundant transmission chains and complex structures, and the parts of the wire trimming drive assembly and the wire trimming cam crankshaft are complex, and the processing cost is high.

发明内容SUMMARY OF THE INVENTION

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自动剪线机构,其简化传动链,精简了自动剪线机构的结构。In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an automatic thread trimming mechanism, which simplifies the transmission chain and simplifies the structure of the automatic thread trimming mechanism.

为实现上述目的,本发明提供一种自动剪线机构,包括可转动支承在缝纫机底板中的下轴、固定在下轴上的剪线驱动凸轮、可绕下轴摆动动刀组件,动刀组件具有至少一把动刀,还包括与下轴相平行的剪线轴、安装在剪线轴一端的剪线凸轮曲柄、以及固定在剪线轴另一端的剪线曲柄,所述剪线凸轮曲柄上连接有滚珠,所述剪线曲柄通过驱动机构与动刀组件相连接;剪线时,所述滚珠和剪线驱动凸轮外周的剪线凸轮轮廓面相配合,所述剪线凸轮曲柄、剪线轴和剪线曲柄同步摆动。In order to achieve the above object, the present invention provides an automatic thread trimming mechanism, which includes a lower shaft rotatably supported in the bottom plate of the sewing machine, a thread trimming drive cam fixed on the lower shaft, and a movable knife assembly that can swing around the lower shaft. At least one movable knife, also comprising a thread trimming shaft parallel to the lower shaft, a thread trimming cam crank mounted on one end of the thread trimming shaft, and a thread trimming crank fixed at the other end of the thread trimming shaft, the thread trimming cam crank is connected with a ball , the thread trimming crank is connected with the moving knife assembly through a drive mechanism; when trimming the thread, the ball matches the thread trimming cam contour surface on the outer periphery of the thread trimming drive cam, and the thread trimming cam crank, thread trimming shaft and thread trimming crank Sync swing.

进一步地,还包括与剪线凸轮曲柄相固定的复位片,所述复位片远离剪线凸轮曲柄的一端设有强制复位部和容剪线轴穿过的通孔,所述下轴上固定有强制复位驱动凸轮;当滚珠运动至剪线凸轮轮廓面上剪线段的末端时,所述强制复位部近邻于强制复位驱动凸轮外周的强制复位凸轮轮廓面。Further, it also includes a reset piece fixed with the thread trimming cam crank, one end of the reset piece away from the thread trimming cam crank is provided with a forced reset portion and a through hole through which the thread trimming shaft passes, and the lower shaft is fixed with a forced reset portion. Reset the drive cam; when the ball moves to the end of the trimming segment on the contour surface of the trimming cam, the forced reset portion is adjacent to the forced reset cam contour surface on the outer periphery of the forced reset drive cam.

进一步地,还包括动力源,该动力源通过传动机构与剪线凸轮曲柄相连接;剪线时,所述动力源动作,通过传动机构驱动剪线凸轮曲柄沿剪线轴的轴向移动,使所述滚珠与剪线凸轮轮廓面相配合,且使所述强制复位部位于强制复位凸轮轮廓面的外周侧。Further, it also includes a power source, which is connected with the thread trimming cam crank through a transmission mechanism; when the thread is trimmed, the power source moves, and the transmission mechanism drives the thread trimming cam crank to move along the axial direction of the thread trimming shaft, so that the The ball is matched with the profile surface of the thread trimming cam, and the forced reset portion is located on the outer peripheral side of the profile surface of the forced reset cam.

优选地,所述动力源为电磁铁、具有平行于下轴的芯轴,所述传动机构包括顶杆和顶销,所述芯轴的端部固定在顶销中,所述顶杆的一端固定在顶销中,顶杆的另一端与剪线凸轮曲柄的端面相抵接。Preferably, the power source is an electromagnet with a mandrel parallel to the lower shaft, the transmission mechanism includes a top rod and a top pin, the end of the mandrel is fixed in the top pin, and one end of the top rod is It is fixed in the ejector pin, and the other end of the ejector rod abuts against the end face of the crank of the thread trimming cam.

进一步地,所述剪线轴的外周面上开设有轴向延伸的键槽,所述剪线凸轮曲柄与剪线轴通过滑键相连接,所述滑键位于剪线轴的键槽中、并可沿键槽的延伸方向往复滑移。Further, an axially extending keyway is provided on the outer peripheral surface of the thread trimming shaft, the thread trimming cam crank and the thread trimming shaft are connected by a sliding key, and the sliding key is located in the keyway of the thread trimming shaft and can be along the keyway. Reciprocating sliding in the extension direction.

进一步地,还包括固定在剪线轴上的导向块、以及固定在剪线凸轮曲柄上的扭矩传递块,所述导向块的外周面上开设有平行于剪线轴的导向槽,所述扭矩传递块面向导向块的一端延伸出有导向部,所述导向部与导向槽间隙配合、并可沿导向槽的延伸方向往复滑移。Further, it also includes a guide block fixed on the thread trimmer shaft and a torque transmission block fixed on the thread trimmer cam crank, the outer peripheral surface of the guide block is provided with a guide groove parallel to the thread trimmer shaft, the torque transmission block A guide portion extends from one end facing the guide block, the guide portion fits with the guide groove in a clearance fit, and can reciprocate and slide along the extending direction of the guide groove.

优选地,所述剪线凸轮曲柄开设有D字形通孔,所述剪线轴上设有一段横截面为D字形的轴连接段,所述轴连接段穿设在D字形通孔中、两者间隙配合。Preferably, the wire-cutting cam crank is provided with a D-shaped through hole, the wire-cutting shaft is provided with a D-shaped shaft connecting section in cross section, and the shaft connecting section is penetrated in the D-shaped through hole, and both Clearance fit.

优选地,所述剪线轴上套有复位弹簧、并固定有位于挡圈,所述挡圈位于剪线曲柄和复位片之间,所述复位弹簧的两端分别与复位片和挡圈相抵接。Preferably, a return spring is sleeved on the thread trimming shaft, and a retaining ring is fixed. The retaining ring is located between the thread trimming crank and the reset piece, and both ends of the return spring are respectively in contact with the reset piece and the stop ring. .

优选地,所述剪线轴上套有复位扭簧,该复位扭簧的两端分别与剪线曲柄和缝纫机底板相抵接。Preferably, a reset torsion spring is sleeved on the thread trimming shaft, and both ends of the reset torsion spring are respectively abutted with the thread trimming crank and the bottom plate of the sewing machine.

进一步地,自动剪线机构为单动刀结构,此时,自动剪线机构还包括固定于缝纫机底板的定刀,所述动刀有一把,所述动刀组件还包括一用于安装动刀的动刀架,所述驱动机构包括剪线连杆,所述剪线连杆的两端分别与剪线曲柄和动刀架铰接。Further, the automatic thread trimming mechanism is a single-moving knife structure. At this time, the automatic thread trimming mechanism also includes a fixed knife fixed on the bottom plate of the sewing machine, there is one moving knife, and the moving knife assembly also includes a moving knife for installing the moving knife. The driving mechanism includes a thread trimming link, and both ends of the thread trimming link are respectively hinged with the thread trimming crank and the movable tool rest.

或者,自动剪线机构为双动刀结构,此时,所述动刀有两把、分别为第一动刀和第二动刀,所述动刀组件还包括一用于安装第一动刀的第一动刀架、以及用于安装第二动刀的第二动刀架,所述驱动机构包括相平行的第一剪线连杆和第二剪线连杆,所述剪线曲柄有两个、分别为第一剪线曲柄和第二剪线曲柄,所述第一剪线连杆的两端分别与第一剪线曲柄和第一动刀架铰接,所述第二剪线连杆的两端分别与第二剪线曲柄和第二动刀架铰接。Or, the automatic thread trimming mechanism is a double-moving knife structure. In this case, the moving knives have two, which are a first moving knife and a second moving knife respectively, and the moving knife assembly further includes a moving knife for installing the first moving knife. The first movable knife rest of the 1st movable knife and the second movable knife rest for installing the second movable knife; The two are the first thread trimming crank and the second thread trimming crank, the two ends of the first thread trimming connecting rod are respectively hinged with the first thread trimming crank and the first moving tool rest, and the second thread trimming link is connected Both ends of the rod are respectively hinged with the second thread trimming crank and the second movable tool rest.

进一步地,所述剪线曲柄包括相互独立的曲柄部和连杆部,所述曲柄部的一端与剪线轴相固定,曲柄部的另一端与连杆部的一端相固定,连杆部的另一端与所述驱动机构相铰接。Further, the trimming crank includes a crank portion and a connecting rod portion that are independent of each other, one end of the crank portion is fixed with the trimming shaft, the other end of the crank portion is fixed with one end of the connecting rod portion, and the other end of the connecting rod portion is fixed. One end is hinged with the drive mechanism.

优选地,所述曲柄部为粉末冶金件,所述连杆部为钣金件。Preferably, the crank part is a powder metallurgy part, and the connecting rod part is a sheet metal part.

进一步地,还包括一呈圆盘状的刀架压套,所述刀架压套套在下轴上、并与动刀架背向剪线曲柄的端面相抵接,所述刀架压套通过至少一个紧固螺钉固定于缝纫机底板,多个紧固螺钉沿下轴的径向延伸。Further, it also includes a disc-shaped tool holder pressing sleeve, the tool holder pressing sleeve is sleeved on the lower shaft, and abuts the end face of the movable tool holder facing away from the wire trimming crank, and the tool holder pressing sleeve passes through at least one The fastening screws are fixed on the bottom plate of the sewing machine, and a plurality of fastening screws extend along the radial direction of the lower shaft.

进一步地,所述缝纫机底板的下端面上设有限位面,所述剪线曲柄面向限位面的端面上开设有收容孔,该收容孔中内置有弹性垫,所述弹性垫与限位面相配合。Further, a limit surface is provided on the lower end surface of the bottom plate of the sewing machine, and a receiving hole is formed on the end surface of the thread trimming crank facing the limit surface. An elastic pad is built in the receiving hole, and the elastic pad is in contact with the limit surface. Cooperate.

本发明还提供一种缝纫机,包括缝纫机底板和如上所述的自动剪线机构,所述下轴可转动地支撑在缝纫机底板中。The present invention also provides a sewing machine, comprising a sewing machine base plate and the above-mentioned automatic thread trimming mechanism, wherein the lower shaft is rotatably supported in the sewing machine base plate.

如上所述,本发明涉及的自动剪线机构及缝纫机,具有以下有益效果:As mentioned above, the automatic thread trimming mechanism and sewing machine involved in the present invention have the following beneficial effects:

本申请简化了自动剪线机构的结构,通过一级传动即可带动动刀绕下轴摆动、与定刀咬合,实现自动剪线,与现有技术相比,本申请简化了自动剪线机构的传动链,从而降低成本。The present application simplifies the structure of the automatic thread trimming mechanism. The movable knife can be driven to swing around the lower shaft and engage with the fixed knife through one-stage transmission to realize automatic thread trimming. Compared with the prior art, the present application simplifies the automatic thread trimming mechanism. drive chain, thereby reducing costs.

附图说明Description of drawings

图1为现有技术中自动剪线机构的结构示意图。FIG. 1 is a schematic structural diagram of an automatic thread trimming mechanism in the prior art.

图2为图1的爆炸图。FIG. 2 is an exploded view of FIG. 1 .

图3为图1的原理图。FIG. 3 is a schematic diagram of FIG. 1 .

图4为本申请中单动刀结构的自动剪线机构的结构示意图。FIG. 4 is a schematic structural diagram of the automatic thread trimming mechanism of the single-acting knife structure in the application.

图5、图6为图4省略缝纫机底板后的结构示意图。5 and 6 are schematic diagrams of the structure of the sewing machine in which the bottom plate of the sewing machine is omitted in FIG. 4 .

图7为图4中剪线曲柄与缝纫机底板的连接示意图。FIG. 7 is a schematic diagram of the connection between the thread trimming crank and the bottom plate of the sewing machine in FIG. 4 .

图8为本申请中剪线凸轮曲柄与剪线轴连接结构实施例一的示意图。FIG. 8 is a schematic diagram of Embodiment 1 of the connection structure between the thread trimming cam crank and the thread trimming shaft in the present application.

图9为图4中复位片的结构示意图。FIG. 9 is a schematic structural diagram of the reset piece in FIG. 4 .

图10为本申请中单动刀结构的自动剪线机构的原理图。FIG. 10 is a schematic diagram of the automatic thread trimming mechanism of the single-acting knife structure in the application.

图11为本申请中双动刀结构的自动剪线机构的结构示意图。FIG. 11 is a schematic structural diagram of the automatic thread trimming mechanism of the double-acting knife structure in the application.

图12为本申请中剪线凸轮曲柄与剪线轴连接结构实施例二的示意图。FIG. 12 is a schematic diagram of Embodiment 2 of the connection structure between the thread trimming cam crank and the thread trimming shaft in the present application.

图13为本申请中剪线凸轮曲柄与剪线轴连接结构实施例三的示意图。FIG. 13 is a schematic diagram of Embodiment 3 of the connection structure between the thread trimming cam crank and the thread trimming shaft in the present application.

图14为图13中剪线凸轮曲柄的结构示意图。FIG. 14 is a schematic structural diagram of the thread trimming cam crank in FIG. 13 .

元件标号说明Component label description

1 缝纫机底板1 Sewing machine base plate

101 限位面101 Limit surface

2 下轴2 lower shaft

3 驱动凸轮3 drive cam

31 剪线驱动凸轮31 Thread trimmer drive cam

32 剪线凸轮轮廓面32 Trimming Cam Profile Surface

33 强制复位驱动凸轮33 Force reset drive cam

34 强制复位凸轮轮廓面34 Force reset cam profile

35 连接件35 Connectors

4 动刀架4 moving tool holder

41 第一动刀架41 The first moving tool holder

42 第二动刀架42 Second moving tool holder

5 动刀5 moving knife

51 第一动刀51 The first knife

52 第二动刀52 Second moving knife

6 定刀6 fixed knife

7 剪线轴7 thread trimmer

71 键槽71 keyway

72 轴连接段72 Shaft connection section

8 剪线凸轮曲柄8 Thread trimmer cam crank

81 D字形通孔81 D-shaped through hole

9 剪线曲柄9 Trimming crank

91 曲柄部91 Crank

92 连杆部92 connecting rod

93 收容孔93 accommodating hole

94 第一剪线曲柄94 1st trimmer crank

95 第二剪线曲柄95 Second trimmer crank

10 剪线连杆10 Thread trimmer link

11 滚珠11 Balls

12 复位片12 reset piece

121 复位片本体部121 Reset piece body

122 左臂部122 Left arm

123 强制复位部123 Forced reset section

124 通孔124 through hole

125 右臂部125 Right arm

126 连接通孔126 Connection through holes

13 动力源13 Power source

14 顶杆14 ejector

15 顶销15 Ejector pin

16 滑键16 Slide keys

17 复位弹簧17 Return spring

18 挡圈18 retaining ring

19 复位扭簧19 Return torsion spring

20 刀架压套20 Tool holder press sleeve

21 滚轮轴21 Roller shaft

22 第一剪线连杆22 First thread trimmer link

23 第二剪线连杆23 Second thread trimmer link

24 导向块24 Guide blocks

241 导向槽241 Guide groove

25 扭矩传递块25 Torque transfer block

251 导向部251 Guide

具体实施方式Detailed ways

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。The embodiments of the present invention are described below by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

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。It should be noted that the structures, proportions, sizes, etc. drawn in the accompanying drawings in this specification are only used to cooperate with the contents disclosed in the specification for the understanding and reading of those who are familiar with the technology, and are not intended to limit the conditions for the implementation of the present invention. Therefore, it does not have technical substantive significance, and any structural modification, proportional relationship change or size adjustment should still fall within the scope of the present invention without affecting the effect that the present invention can produce and the purpose that can be achieved. within the scope of technical content. At the same time, the terms such as "up", "down", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the present invention. The practicable scope and the change or adjustment of the relative relationship thereof shall also be regarded as the practicable scope of the present invention without substantially changing the technical content.

本申请提供一种自动剪线机构,安装在缝纫机、特别是平缝机中,用于在每次缝纫结束后将底线和面线剪断;为便于描述,将缝纫机在缝纫时布料的移动方向定义为前方向,故缝纫机中下轴2的延伸方向为左右方向,且下轴2靠近机头的一端为左端,下轴2靠近机尾的一端为右端。如图4至图6所示,所述自动剪线机构包括可转动支承在缝纫机底板1中的下轴2、固定在下轴2上的剪线驱动凸轮31、可绕下轴2摆动的动刀组件、与下轴2相平行的剪线轴7、安装在剪线轴7右端的剪线凸轮曲柄8、以及固定在剪线轴7左端的剪线曲柄9,所述动刀组件包括至少一把动刀5,所述剪线驱动凸轮31的外周面为剪线凸轮轮廓面32,所述剪线凸轮曲柄8上连接有突出于剪线凸轮曲柄8左端面的滚珠11,所述剪线曲柄9通过驱动机构与动刀组件相连接。The present application provides an automatic thread trimming mechanism, which is installed in a sewing machine, especially a lockstitch sewing machine, and is used to cut the lower thread and the upper thread after each sewing; for the convenience of description, the moving direction of the fabric during sewing is defined by the sewing machine Therefore, the extension direction of the lower shaft 2 in the sewing machine is the left-right direction, and the end of the lower shaft 2 close to the machine head is the left end, and the end of the lower shaft 2 close to the machine tail is the right end. As shown in FIG. 4 to FIG. 6 , the automatic thread trimming mechanism includes a lower shaft 2 rotatably supported in the bottom plate 1 of the sewing machine, a thread trimming drive cam 31 fixed on the lower shaft 2 , and a movable knife oscillating around the lower shaft 2 assembly, a thread trimmer shaft 7 parallel to the lower shaft 2, a thread trimmer cam crank 8 mounted on the right end of the thread trimmer shaft 7, and a thread trimmer crank 9 fixed at the left end of the thread trimmer shaft 7, the moving knife assembly includes at least one moving knife 5. The outer peripheral surface of the thread trimming drive cam 31 is the thread trimming cam contour surface 32, the thread trimming cam crank 8 is connected with the ball 11 protruding from the left end surface of the thread trimming cam crank 8, and the thread trimming crank 9 passes through the The driving mechanism is connected with the moving knife assembly.

自动剪线机构可以为单动刀结构,如图4至图6所示,单动刀结构的自动剪线机构还包括固定于缝纫机底板1的定刀6,所述动刀5有一把,所述动刀组件还包括一用于安装动刀5的动刀架4,所述驱动机构包括剪线连杆10,所述剪线连杆10的两端分别与剪线曲柄9和动刀架4通过左右延伸的轴位螺钉相铰接。在正常缝纫时,剪线凸轮曲柄8处于初始位置,此时,滚珠11未置于剪线驱动凸轮31的外周侧,与剪线凸轮轮廓面32之间无配合关系;缝纫结束后,剪线凸轮曲柄8向靠近剪线驱动凸轮31的方向移动,使滚珠11位于剪线驱动凸轮31的外周侧、并与剪线凸轮轮廓面32相配合;此时,如图10所示,下轴2带动剪线驱动凸轮31同步转动,通过剪线驱动凸轮31上剪线凸轮轮廓面32的剪线段与滚珠11配合关系驱动剪线凸轮曲柄8、剪线轴7和剪线曲柄9三者同步摆动,实现一级传动;之后,剪线曲柄9直接通过剪线连杆10驱动动刀架4和动刀5绕下轴2摆动,使动刀5向靠近定刀6的方向转动、与定刀6相咬合,进而在旋梭处将底线和面线剪断,完成自动剪线。The automatic thread trimming mechanism can be a single-acting knife structure. As shown in Figures 4 to 6, the automatic thread trimming mechanism of the single-acting knife structure also includes a fixed knife 6 fixed on the bottom plate 1 of the sewing machine. There is one movable knife 5, so The moving knife assembly also includes a moving knife holder 4 for installing the moving knife 5, and the driving mechanism includes a wire trimmer connecting rod 10, two ends of which are respectively connected to the thread trimming crank 9 and the moving knife frame. 4 are hinged through the left and right extending axial screws. During normal sewing, the thread trimming cam crank 8 is at the initial position. At this time, the ball 11 is not placed on the outer peripheral side of the thread trimming drive cam 31, and has no matching relationship with the thread trimming cam contour surface 32; after sewing, the thread trimming The cam crank 8 moves toward the direction close to the thread trimmer drive cam 31, so that the ball 11 is located on the outer peripheral side of the thread trimmer drive cam 31 and fits with the thread trimmer cam contour surface 32; at this time, as shown in FIG. 10, the lower shaft 2 Drive the thread trimmer drive cam 31 to rotate synchronously, and drive the thread trimmer cam crank 8, thread trimmer shaft 7 and thread trimmer crank 9 to swing synchronously through the cooperative relationship between the thread trimmer segment of the thread trimmer cam contour surface 32 on the thread trimmer drive cam 31 and the ball 11, After that, the thread trimming crank 9 drives the movable knife rest 4 and the movable knife 5 to swing around the lower shaft 2 directly through the thread trimming connecting rod 10, so that the movable knife 5 rotates in the direction close to the fixed knife 6, and is connected with the fixed knife 6. The lower thread and the upper thread are cut at the hook to complete the automatic thread trimming.

自动剪线机构可以为双动刀结构,如图11所示,所述动刀5有两把、分别为第一动刀51和第二动刀52,所述动刀组件还包括一用于安装第一动刀51的第一动刀架41、以及用于安装第二动刀52的第二动刀架42,所述驱动机构包括相平行的第一剪线连杆22和第二剪线连杆23,所述剪线曲柄9有两个、分别为第一剪线曲柄94和第二剪线曲柄95,所述第一剪线连杆22的两端分别与第一剪线曲柄94和第一动刀架41通过左右延伸的轴位螺钉相铰接,所述第二剪线连杆23的两端分别与第二剪线曲柄95和第二动刀架42通过左右延伸的轴位螺钉相铰接。在正常缝纫时,剪线凸轮曲柄8处于初始位置,此时,滚珠11未置于剪线驱动凸轮31的外周侧,与剪线凸轮轮廓面32之间无配合关系;缝纫结束后,剪线凸轮曲柄8向靠近剪线驱动凸轮31的方向移动,使滚珠11位于剪线驱动凸轮31的外周侧、并与剪线凸轮轮廓面32相配合;此时,下轴2带动剪线驱动凸轮31同步转动,通过剪线驱动凸轮31上剪线凸轮轮廓面32的剪线段与滚珠11配合关系驱动剪线凸轮曲柄8、剪线轴7、剪线曲柄9(即第一剪线曲柄94和第二剪线曲柄95)同步摆动,实现一级传动;之后,第一剪线曲柄94直接通过第一剪线连杆22驱动第一动刀架41和第一动刀51绕下轴2摆动,第二剪线曲柄95直接通过第二剪线连杆23驱动第二动刀架42和第二动刀52绕下轴2摆动,使第一动刀51和第二动刀52相向摆动、直至咬合,进而在旋梭处将底线和面线剪断,完成自动剪线。The automatic thread trimming mechanism can be a double-moving knife structure. As shown in FIG. 11, the moving knife 5 has two, which are a first moving knife 51 and a second moving knife 52. The moving knife assembly also includes a The first movable knife rest 41 for installing the first movable knife 51 and the second movable knife rest 42 for installing the second movable knife 52, the driving mechanism includes the parallel first thread trimming link 22 and the second trimmer Wire connecting rod 23, the wire trimming crank 9 has two, respectively, a first wire trimming crank 94 and a second wire trimming crank 95, the two ends of the first wire trimming link 22 are respectively connected with the first wire trimming crank 94 and the first moving tool rest 41 are hinged with each other through axial screws extending left and right, and the two ends of the second thread trimming link 23 are respectively connected with the second thread trimming crank 95 and the second moving tool rest 42 through the shaft extending left and right. Hinged with screws. During normal sewing, the thread trimming cam crank 8 is at the initial position. At this time, the ball 11 is not placed on the outer peripheral side of the thread trimming drive cam 31, and has no matching relationship with the thread trimming cam contour surface 32; after sewing, the thread trimming The cam crank 8 moves toward the direction close to the thread trimmer drive cam 31, so that the ball 11 is located on the outer peripheral side of the thread trimmer drive cam 31 and matches with the thread trimmer cam contour surface 32; at this time, the lower shaft 2 drives the thread trimmer drive cam 31 Rotate synchronously, and drive the thread trimming cam crank 8, thread trimming shaft 7, thread trimming crank 9 (ie the first thread trimming crank 94 and the second thread trimming crank 9) through the cooperative relationship between the thread trimming segment of the thread trimming cam contour surface 32 on the thread trimming drive cam 31 and the ball 11. The thread trimming crank 95) oscillates synchronously to realize the first-level transmission; after that, the first thread trimming crank 94 directly drives the first movable knife rest 41 and the first movable knife 51 to swing around the lower shaft 2 through the first thread trimming connecting rod 22, and the first The second thread trimming crank 95 directly drives the second movable knife rest 42 and the second movable knife 52 to swing around the lower shaft 2 through the second thread trimming link 23, so that the first movable knife 51 and the second movable knife 52 swing toward each other until they are engaged. , and then cut the lower thread and upper thread at the hook to complete automatic thread trimming.

与现有技术相比,本申请通过一级传动即可带动动刀5、或第一动刀51和第二动刀52摆动,简化自动剪线机构的传动链,精简自动剪线机构的结构,取消现有技术中结构复杂的零件,也即降低了自动剪线机构中各零件的加工工艺要求,从而降低自动剪线机构的加工成本,进而降低整个缝纫机的生产成本。Compared with the prior art, the present application can drive the movable knife 5, or the first movable knife 51 and the second movable knife 52 to swing through one-stage transmission, simplify the transmission chain of the automatic thread trimming mechanism, and simplify the structure of the automatic thread trimming mechanism. , eliminating the parts with complex structure in the prior art, that is, reducing the processing technology requirements of each part in the automatic thread trimming mechanism, thereby reducing the processing cost of the automatic thread trimming mechanism, thereby reducing the production cost of the entire sewing machine.

所述滚珠11可以为固定不动的状态,也可以为滚动的状态,本实施例优选采用滚珠11为滚动的状态,可降低滚珠11与剪线凸轮轮廓面32配合时两者之间的摩擦力;此时,如图8所示,所述剪线凸轮曲柄8上固定有一左右延伸的滚轮轴21,所述滚珠11可转动地套在滚轮轴21上、并位于剪线凸轮曲柄8的左侧。以下实施例都以单动刀结构的缝纫机自动剪线机构为例展开叙述。The balls 11 can be in a fixed state or in a rolling state. In this embodiment, the balls 11 are preferably in a rolling state, which can reduce the friction between the balls 11 and the profile surface 32 of the thread trimming cam when they are matched. At this time, as shown in FIG. 8 , a roller shaft 21 extending from left to right is fixed on the thread trimming cam crank 8 , and the ball 11 is rotatably sleeved on the roller shaft 21 and is located in the thread trimming cam crank 8 . left. The following embodiments are described by taking the automatic thread trimming mechanism of a sewing machine with a single-acting knife structure as an example.

优选地,所述剪线凸轮轮廓面32上具有剪线段,剪线段的半径逐渐增加,故剪线段的末端为剪线凸轮轮廓面32的最高点;另外,如图5和图6所示,所述剪线轴7上套有复位扭簧19,该复位扭簧19的两端分别与剪线曲柄9和缝纫机底板1相抵接;当滚珠11与剪线凸轮轮廓面32上的剪线段接触配合时,动刀5向靠近定刀6的方向转动,执行剪线动作;当将缝线剪断后,滚珠11越过剪线凸轮轮廓面32的最高点后,剪线曲柄9在复位扭簧19的作用下复位,通过剪线连杆10带动动刀架4、动刀5、剪线轴7和剪线凸轮曲柄8复位。Preferably, the trimming cam contour surface 32 has trimming segments, and the radius of the trimming segment gradually increases, so the end of the trimming segment is the highest point of the trimming cam contour surface 32; in addition, as shown in FIG. 5 and FIG. 6 , The thread trimming shaft 7 is sleeved with a reset torsion spring 19, and both ends of the reset torsion spring 19 are in contact with the thread trimming crank 9 and the sewing machine base plate 1 respectively; When the moving knife 5 rotates in the direction close to the fixed knife 6, the thread trimming action is performed; after the suture is cut, after the ball 11 crosses the highest point of the thread trimming cam profile surface 32, the thread trimming crank 9 is in the position of the reset torsion spring 19. Under the action of reset, the movable knife holder 4, the movable knife 5, the thread trimming shaft 7 and the thread trimming cam crank 8 are driven to reset by the thread trimming connecting rod 10.

进一步地,如图5和图6、以及图8和图9所示,自动剪线机构还包括复位片12,该复位片12位于剪线凸轮曲柄8的左端侧,复位片12大致上呈凹形,其包括左右平直延伸的复位片本体部121、以及设在复位片本体部121左右两端处的左臂部122和右臂部125,右臂部125的前后两端处都开设有连接通孔126,复位片12在连接通孔126处通过螺钉与剪线凸轮曲柄8相固定,从而将复位片12整体固定于剪线凸轮曲柄8;左臂部122上具有强制复位部123和容剪线轴7穿过的通孔124,下轴2上固定有强制复位驱动凸轮33,该强制复位驱动凸轮33的外周面为强制复位凸轮轮廓面34。剪线时,当剪线凸轮曲柄8向靠近剪线驱动凸轮31的方向移动时,剪线凸轮曲柄8带动复位片12向靠近强制复位驱动凸轮33的方向移动,使复位片12上的强制复位部123位于强制复位凸轮轮廓面34的外周侧;当动刀5和定刀6相咬合、将缝线剪断时,也即为滚珠11越过剪线凸轮轮廓面32的最高点或者说是滚珠11运动至剪线凸轮轮廓面32上剪线段的末端时,强制复位部123近邻于强制复位凸轮轮廓面34。正常情况下,剪线曲柄9、动刀架4、动刀5、剪线轴7和剪线凸轮曲柄8通过套在剪线轴7上的复位扭簧19实现自动复位,故剪线凸轮曲柄8同时也带动复位片12复位,复位后,复位片12上强制复位部123与强制复位驱动凸轮33之间的间隙变大、不足以使强制复位部123与强制复位凸轮轮廓面34接触配合,故在通过复位扭簧19实现正常复位的情况下,强制复位部123不起作用。但是,由于卡线或其他原因导致复位扭簧19不能使动刀5与定刀6相分离时,则动刀架4、剪线曲柄9、剪线轴7、剪线凸轮曲柄8和复位片12都没有正常复位,此时,强制复位部123仍然近邻于强制复位凸轮轮廓面34,故下轴2带动强制复位驱动凸轮33同步转动时,通过强制复位部123和强制复位凸轮轮廓面34的相配合驱动强制复位片12动作,进而使得复位片12复位,从而驱动剪线凸轮曲柄8、剪线轴7、剪线曲柄9、动刀架4和动刀5强制复位,强制动刀5与定刀6相分离,保证下一次自动剪线能够正常进行。较优地,如图8所示,复位片12的右臂部125上的两个连接通孔126为腰形孔,其可以微调复位片12相对于剪线凸轮曲柄8的固定位置,从而微调强制复位部123相对于强制复位驱动凸轮33的位置,也即调整滚珠11越过剪线凸轮轮廓面32的最高点时、强制复位部123与强制复位凸轮轮廓面34之间的间隙。Further, as shown in Figures 5 and 6, as well as Figures 8 and 9, the automatic thread trimming mechanism further includes a reset piece 12, which is located on the left end side of the thread trimming cam crank 8, and the reset piece 12 is substantially concave. It includes a reset piece body portion 121 extending straight from left to right, and a left arm portion 122 and a right arm portion 125 disposed at the left and right ends of the reset piece body portion 121. The front and rear ends of the right arm portion 125 are provided with Connect the through hole 126, the reset piece 12 is fixed with the thread trimming cam crank 8 by screws at the connecting through hole 126, so as to fix the reset piece 12 to the thread trimming cam crank 8 as a whole; the left arm portion 122 has a forced reset portion 123 and The through hole 124 through which the spool 7 passes, the lower shaft 2 is fixed with a forced reset driving cam 33 , and the outer peripheral surface of the forced reset driving cam 33 is the forced reset cam profile surface 34 . During thread trimming, when the thread trimming cam crank 8 moves in the direction close to the thread trimming drive cam 31, the thread trimming cam crank 8 drives the reset piece 12 to move in the direction close to the forced reset drive cam 33, so that the reset piece 12 is forced to reset. The portion 123 is located on the outer peripheral side of the forced reset cam profile surface 34; when the movable knife 5 and the fixed knife 6 are engaged to cut the suture, that is, the ball 11 crosses the highest point of the thread trimming cam profile surface 32 or the ball 11 When moving to the end of the thread trimming segment on the thread trimming cam profile surface 32 , the forced reset portion 123 is adjacent to the forced reset cam profile surface 34 . Under normal circumstances, the thread trimming crank 9, the movable knife holder 4, the movable knife 5, the thread trimming shaft 7 and the thread trimming cam crank 8 are automatically reset by the reset torsion spring 19 sleeved on the thread trimming shaft 7, so the thread trimming cam crank 8 simultaneously It also drives the reset piece 12 to reset. After reset, the gap between the forced reset portion 123 on the reset piece 12 and the forced reset drive cam 33 becomes larger, which is not enough for the forced reset portion 123 to contact the forced reset cam profile surface 34. When normal return is achieved by the return torsion spring 19, the forced return portion 123 does not function. However, when the reset torsion spring 19 cannot separate the movable knife 5 from the fixed knife 6 due to the wire clamping or other reasons, the movable knife holder 4, the thread trimming crank 9, the thread trimming shaft 7, the thread trimming cam crank 8 and the reset piece 12 At this time, the forced reset portion 123 is still adjacent to the forced reset cam profile surface 34. Therefore, when the lower shaft 2 drives the forced reset drive cam 33 to rotate synchronously, the forced reset portion 123 and the forced reset cam profile surface 34 are in phase. Cooperate with the action of driving the forced reset piece 12, so as to reset the reset piece 12, thereby driving the thread trimming cam crank 8, thread trimming shaft 7, thread trimming crank 9, movable knife holder 4 and movable knife 5 to forcibly reset, forcing the movable knife 5 and the fixed knife to reset. The 6-phase separation ensures that the next automatic thread trimming can be carried out normally. Preferably, as shown in FIG. 8 , the two connecting through holes 126 on the right arm portion 125 of the reset piece 12 are waist-shaped holes, which can fine-tune the fixed position of the reset piece 12 relative to the thread trimming cam crank 8, so as to fine-tune the fixed position of the reset piece 12 relative to the thread trimming cam crank 8. The position of the forced reset portion 123 relative to the forced reset drive cam 33 , that is, to adjust the gap between the forced reset portion 123 and the forced reset cam profile surface 34 when the ball 11 passes over the highest point of the thread trimming cam profile surface 32 .

优选地,如图5和图6所示,所述剪线驱动凸轮31和强制复位驱动凸轮33通过连接件35相连接,剪线驱动凸轮31和强制复位驱动凸轮33分别位于连接件35的右侧和左侧,剪线驱动凸轮31、连接件35和强制复位驱动凸轮33加工成一整体件,将该整体件定义为驱动凸轮3。Preferably, as shown in FIG. 5 and FIG. 6 , the thread trimming drive cam 31 and the forced reset drive cam 33 are connected through a connector 35 , and the thread trimmer drive cam 31 and the forced reset drive cam 33 are located on the right side of the connector 35 respectively. On the side and the left side, the thread trimmer drive cam 31 , the connecting piece 35 and the forced return drive cam 33 are processed into an integral piece, which is defined as the drive cam 3 .

本实施例中,所述剪线凸轮曲柄8可沿剪线轴7的轴向直线往复移动,以使滚珠11与剪线凸轮轮廓面32相配合或分离、以及使强制复位部123与强制复位凸轮轮廓面34相近或远离,通过复位片12的左臂部122上的通孔124与剪线轴7的相配合可起到导向作用。此时,如图5和图6所示,自动剪线机构还包括动力源13,该动力源13通过传动机构与剪线凸轮曲柄8相连接;剪线时,动力源13动作,通过传动机构驱动剪线凸轮曲柄8沿剪线轴7的轴向向左移动,使所述滚珠11与剪线凸轮轮廓面32相配合,且使所述强制复位部123位于强制复位凸轮轮廓面34的外周侧。所述剪线轴7上还套有复位弹簧17、并固定有位于挡圈18,所述挡圈18位于剪线曲柄9和复位片12之间,所述复位弹簧17的两端分别与复位片12和挡圈18相抵接;剪线结束后,动力源13复位,通过复位弹簧17的弹力使复位片12和剪线凸轮曲柄8向右移动、复位。In the present embodiment, the thread trimming cam crank 8 can linearly reciprocate along the axial direction of the thread trimming shaft 7, so that the balls 11 and the thread trimming cam contour surface 32 are matched or separated, and the forced reset portion 123 is connected to the forced reset cam. The contour surfaces 34 are close to or away from each other, and the through hole 124 on the left arm portion 122 of the reset piece 12 cooperates with the thread trimmer shaft 7 to play a guiding role. At this time, as shown in FIGS. 5 and 6 , the automatic thread trimming mechanism further includes a power source 13, which is connected to the thread trimming cam crank 8 through a transmission mechanism; when the thread is trimmed, the power source 13 acts, and the transmission mechanism Drive the thread trimming cam crank 8 to move leftward along the axial direction of the thread trimming shaft 7 , so that the balls 11 are matched with the thread trimming cam profile surface 32 , and the forced reset portion 123 is located on the outer peripheral side of the forced reset cam profile surface 34 . The thread trimming shaft 7 is also sleeved with a return spring 17, and a retaining ring 18 is fixed. The retaining ring 18 is located between the thread trimming crank 9 and the reset piece 12. The two ends of the reset spring 17 are respectively connected to the reset piece. 12 is in contact with the retaining ring 18; after the thread trimming is completed, the power source 13 is reset, and the reset piece 12 and the thread trimming cam crank 8 are moved to the right and reset by the elastic force of the reset spring 17.

优选地,所述动力源13为电磁铁、具有平行于下轴2的芯轴,所述传动机构包括顶杆14和顶销15,所述芯轴的左端部固定在顶销15中,所述顶杆14的右端固定在顶销15中,顶杆14的左端与剪线凸轮曲柄8的右端面相抵接。剪线时,电磁铁通电,电磁铁的铁芯在磁力作用下向靠近电磁铁磁体的方向向左缩进,故电磁铁的芯轴向左伸出,带动顶销15和顶杆14同步地向左移动,进而推动剪线凸轮曲柄8向左移动。为了实现剪线凸轮曲柄8左右移动时的导向、以及剪线凸轮曲柄8与剪线轴7之间扭矩的传递,剪线凸轮曲柄8与剪线轴7具有两种实施例:实施例一、如图8所示,所述剪线轴7的外周面上开设有轴向延伸的键槽71,所述剪线凸轮曲柄8与剪线轴7通过滑键16相连接,所述滑键16位于剪线轴7的键槽71中、并可沿键槽71的延伸方向自由往复滑移,滑键16和键槽71的相互配合用于实现剪线凸轮曲柄8相对于剪线轴7轴向滑移、以及剪线凸轮曲柄8与剪线轴7之间的扭矩传递。由于实施例一中滑键16的装配需要在剪线凸轮曲柄8的内周侧进行,装配非常不便,且剪线凸轮曲柄8需要额外开始容纳滑键16的键槽,导致剪线凸轮曲柄8加工不便。Preferably, the power source 13 is an electromagnet with a mandrel parallel to the lower shaft 2 , the transmission mechanism includes a top rod 14 and a top pin 15 , and the left end of the mandrel is fixed in the top pin 15 , so The right end of the ejector rod 14 is fixed in the ejector pin 15 , and the left end of the ejector rod 14 is in contact with the right end surface of the thread trimming cam crank 8 . When the wire is trimmed, the electromagnet is energized, and the iron core of the electromagnet is retracted to the left in the direction close to the magnet of the electromagnet under the action of the magnetic force, so the core axis of the electromagnet extends to the left, driving the ejector pin 15 and ejector rod 14 synchronously. Move to the left, thereby pushing the thread trimmer cam crank 8 to the left. In order to realize the guidance when the thread trimming cam crank 8 moves left and right, and the torque transmission between the thread trimming cam crank 8 and the thread trimming shaft 7, the thread trimming cam crank 8 and the thread trimming shaft 7 have two embodiments: Embodiment 1, as shown in the figure 8, the outer peripheral surface of the thread trimming shaft 7 is provided with an axially extending keyway 71, and the thread trimming cam crank 8 and the thread trimming shaft 7 are connected by a sliding key 16, which is located at the edge of the thread trimming shaft 7. In the keyway 71, and can freely reciprocate and slide along the extension direction of the keyway 71, the sliding key 16 and the keyway 71 cooperate with each other to realize the axial sliding of the thread trimming cam crank 8 relative to the thread trimming shaft 7, and the thread trimming cam crank 8 Torque transmission with the thread trimmer shaft 7. Since the assembly of the slider key 16 in the first embodiment needs to be performed on the inner peripheral side of the thread trimmer cam crank 8, the assembly is very inconvenient, and the thread trimmer cam crank 8 needs to additionally start to accommodate the key groove of the slider key 16, resulting in the machining of the thread trimmer cam crank 8 inconvenient.

为提高剪线凸轮曲柄8与剪线轴7的装配便捷性,本申请还提供一种剪线凸轮曲柄8与剪线轴7连接结构的实施例二、如图12所示,还包括紧配合地固定在剪线轴7上的导向块24、以及通过两个径向螺钉固定在剪线凸轮曲柄8上的扭矩传递块25,所述导向块24位于剪线凸轮曲柄8的左侧,导向块24的外周面上开设有左右贯通的导向槽241,所述扭矩传递块25面向导向块24的左端设有向左延伸的导向部251,所述导向部251与导向槽241间隙配合、并可沿导向槽241的延伸方向往复滑移。当顶杆14推动剪线凸轮曲柄8和扭矩传递块25一起向左移动时,通过导向部251与导向槽241的间隙配合可起到较好的导向作用;当剪线驱动凸轮31通过滚珠11驱动剪线凸轮曲柄8和扭矩传递块25一起摆动时,通过导向部251与导向槽241的间隙配合可驱动导向块24随扭矩传递块25一起摆动,进而驱动剪线轴7随剪线凸轮曲柄8一起摆动,实现轴向移动导向和扭矩传递。该实施例二中,剪线凸轮曲柄8和导向块24只需开设与剪线轴7相配合的通孔,而剪线凸轮曲柄8与扭矩传递块25、扭矩传递块25与导向块24的装配都在剪线凸轮曲柄8的外部进行,故装配非常方便,易操作,各零件也容易加工,装配精度高。In order to improve the assembly convenience of the thread trimming cam crank 8 and the thread trimming shaft 7, the present application also provides a second embodiment of the connection structure between the thread trimming cam crank 8 and the thread trimming shaft 7, as shown in FIG. The guide block 24 on the thread trimmer shaft 7 and the torque transmission block 25 fixed on the thread trimmer cam crank 8 by two radial screws, the guide block 24 is located on the left side of the thread trimmer cam crank 8, and the guide block 24 The outer peripheral surface is provided with a guide groove 241 penetrating left and right. The left end of the torque transmission block 25 facing the guide block 24 is provided with a guide portion 251 extending leftward. The extending direction of the groove 241 reciprocates and slides. When the ejector rod 14 pushes the thread trimming cam crank 8 and the torque transmission block 25 to move to the left together, the clearance fit between the guide portion 251 and the guide groove 241 can play a better guiding role; when the thread trimming drive cam 31 passes the ball 11 When the thread trimming cam crank 8 and the torque transmission block 25 are driven to swing together, the guide block 24 can be driven to swing together with the torque transmission block 25 through the clearance fit between the guide portion 251 and the guide groove 241 , thereby driving the thread trimming shaft 7 to follow the thread trimming cam crank 8 Swing together to achieve axial movement guidance and torque transmission. In the second embodiment, the thread trimming cam crank 8 and the guide block 24 only need to open a through hole matching the thread trimming shaft 7, and the thread trimming cam crank 8 and the torque transmission block 25 and the torque transmission block 25 and the guide block 24 are assembled All are performed outside the wire trimming cam crank 8, so the assembly is very convenient and easy to operate, and the parts are also easy to process, and the assembly precision is high.

或者,剪线凸轮曲柄8与剪线轴7连接结构也可以采用下述的实施例三:如图13和图14所示,剪线凸轮曲柄8中开设有左右贯通的连接通孔,该连接通孔为非圆形、具有至少一段平面部,故连接通孔可以为方形、棱形、多边形、D字形等;所述剪线轴7上设有一段轴连接段72,该段轴连接段72的横截面与连接通孔的形状相适配、并与连接通孔间隙配合,从而实现剪线凸轮曲柄8相对于轴连接段72滑动、并能够带动轴连接段72转动。较优地,所述剪线凸轮曲柄8开设有D字形通孔81,剪线轴7上的轴连接段72的横截面也为D字形、并与D字形通孔81间隙配合。Alternatively, the connection structure between the thread trimming cam crank 8 and the thread trimming shaft 7 may also adopt the following third embodiment: as shown in FIGS. The hole is non-circular and has at least one section of plane, so the connecting through hole can be square, prismatic, polygonal, D-shaped, etc.; The cross section is adapted to the shape of the connecting through hole, and is clearance fit with the connecting through hole, so that the wire cutter cam crank 8 can slide relative to the shaft connecting section 72 and can drive the shaft connecting section 72 to rotate. Preferably, the thread trimming cam crank 8 is provided with a D-shaped through hole 81 , and the cross section of the shaft connecting section 72 on the thread trimming shaft 7 is also D-shaped, and fits with the D-shaped through hole 81 in a clearance fit.

为了进一步简化零件结构、降低成本,如图5和图7所示,将单动刀结构的自动剪线机构中的剪线曲柄9分解成相互独立的曲柄部91和连杆部92,曲柄部91的一端与剪线轴7相固定,曲柄部91的另一端与连杆部92的一端通过两个螺钉相固定、组装成剪线曲柄9,连杆部92的另一端与所述剪线连杆10相铰接。或者,如图11所示,将双动刀结构的自动剪线机构中的第一剪线曲柄94分解成相互独立的曲柄部91和连杆部92,曲柄部91的一端与剪线轴7相固定,曲柄部91的另一端与连杆部92的一端通过两个螺钉相固定、组装成第一剪线曲柄94,连杆部92的另一端与第一剪线连杆22相铰接。将剪线曲柄9分体后,可简化其曲柄部91和连杆部92的结构,并可使曲柄部91采用粉末冶金件,使连杆部92采用钣金件,降低零件成本。如图7所示,所述缝纫机底板1的下端面上设有限位面101,所述剪线曲柄9的曲柄部91面向限位面101的端面上开设有收容孔93,该收容孔93中内置有由橡胶制成的弹性垫,所述弹性垫与限位面101相配合,以此来限定动刀架4和动刀5的初始位置。In order to further simplify the structure of parts and reduce the cost, as shown in Figures 5 and 7, the trimming crank 9 in the automatic trimming mechanism of the single-acting knife structure is decomposed into a crank part 91 and a connecting rod part 92 which are independent of each other. One end of 91 is fixed with the thread trimmer shaft 7, the other end of the crank portion 91 is fixed with one end of the connecting rod portion 92 by two screws, and assembled into a thread trimming crank 9, and the other end of the connecting rod portion 92 is connected with the thread trimmer. The rods 10 are hinged. Alternatively, as shown in FIG. 11 , the first thread trimming crank 94 in the automatic thread trimming mechanism of the double-acting knife structure is decomposed into a crank part 91 and a connecting rod part 92 which are independent of each other, and one end of the crank part 91 is connected to the thread trimming shaft 7 . For fixing, the other end of the crank part 91 and one end of the connecting rod part 92 are fixed by two screws to form a first trimming crank 94 , and the other end of the connecting rod part 92 is hinged with the first trimming link 22 . After the trimming crank 9 is divided, the structures of the crank part 91 and the connecting rod part 92 can be simplified, and the crank part 91 can be made of powder metallurgy parts, and the connecting rod part 92 can be made of sheet metal parts, so as to reduce the cost of parts. As shown in FIG. 7 , a limiting surface 101 is provided on the lower end surface of the sewing machine base 1 , and a receiving hole 93 is formed on the end surface of the crank portion 91 of the thread trimming crank 9 facing the limiting surface 101 . An elastic pad made of rubber is built in, and the elastic pad cooperates with the limiting surface 101 to limit the initial positions of the movable knife rest 4 and the movable knife 5 .

如图5和图6所示,自动剪线机构还包括一呈圆盘状的刀架压套20,所述刀架压套20套在下轴2上、并与动刀架4背向剪线曲柄9的左端面相抵接,用于压住动刀架4;由于自动剪线机构结构简化,故可使得刀架压套20通过至少一个紧固螺钉固定于缝纫机底板1,所述紧固螺钉沿下轴2的径向延伸,以此来减少自动剪线机构的占用空间;本实施例中,由于刀架压套20只起到限位作用,其所受的轴向力很小,刀架压套20脱出的风险也就较小,故用于固定刀架压套20和缝纫机底板1的紧固螺钉有且仅有一个。As shown in FIG. 5 and FIG. 6 , the automatic thread trimming mechanism further includes a disc-shaped tool holder pressing sleeve 20 , the tool holder pressing sleeve 20 is sleeved on the lower shaft 2 and faces away from the movable tool holder 4 for thread trimming. The left end faces of the cranks 9 are in contact with each other for pressing the movable knife rest 4; due to the simplified structure of the automatic thread trimming mechanism, the knife rest pressing sleeve 20 can be fixed to the sewing machine base plate 1 by at least one fastening screw. It extends along the radial direction of the lower shaft 2, so as to reduce the space occupied by the automatic thread trimming mechanism; in this embodiment, since the tool holder pressing sleeve 20 only plays a limiting role, the axial force it receives is very small, and the tool The risk of the frame pressing sleeve 20 coming out is also small, so there is only one fastening screw for fixing the tool holder pressing sleeve 20 and the sewing machine base plate 1 .

具有上述结构的单动刀自动剪线机构的工作原理如下:初始状态下,电磁铁断电,电磁铁的铁芯为向右伸出的状态,剪线凸轮曲柄8位于驱动凸轮3的右侧,滚珠11与剪线凸轮轮廓面32相分离,动刀5与定刀6相分离。剪线时,电磁铁通电,芯轴向左移动,通过顶销15和顶杆14推动剪线凸轮曲柄8克服复位弹簧17的压力向左移动,复位弹簧17被压缩,滚珠11位于剪线驱动凸轮31的外周侧;下轴2带动驱动凸轮3同步转动,使滚珠11与剪线凸轮轮廓面32的剪线段相配合,从而驱动剪线凸轮曲柄8摆动,剪线凸轮曲柄8带动剪线轴7和剪线曲柄9同步摆动,剪线曲柄9通过剪线连杆10驱动动刀架4和动刀5绕下轴2摆动,将底线和面线剪断。下轴2带动驱动凸轮3继续同步转动,滚珠11越过剪线凸轮轮廓面32的最高点,电磁铁断电,复位弹簧17使得复位片12和剪线凸轮曲柄8复位;同时复位扭簧19使剪线曲柄9、动刀架4、动刀5、剪线轴7、剪线凸轮曲柄8复位,或在卡线等情况下复位片12使剪线曲柄9、动刀架4、动刀5、剪线轴7、剪线凸轮曲柄8强制复位。至此,完成一个剪线循环。The working principle of the single-acting knife automatic thread trimming mechanism with the above structure is as follows: in the initial state, the electromagnet is powered off, the iron core of the electromagnet is in a state of extending to the right, and the thread trimming cam crank 8 is located on the right side of the driving cam 3 , the ball 11 is separated from the profile surface 32 of the trimming cam, and the movable knife 5 is separated from the fixed knife 6 . When trimming the thread, the electromagnet is energized, the core axis moves to the left, and the thread trimming cam crank 8 is pushed to the left by the ejector pin 15 and ejector rod 14 against the pressure of the return spring 17, the return spring 17 is compressed, and the ball 11 is located in the thread trimmer drive. The outer peripheral side of the cam 31; the lower shaft 2 drives the driving cam 3 to rotate synchronously, so that the ball 11 is matched with the thread trimming segment of the thread trimming cam profile surface 32, thereby driving the thread trimming cam crank 8 to swing, and the thread trimming cam crank 8 drives the thread trimming shaft 7 Swing synchronously with the thread trimming crank 9, the thread trimming crank 9 drives the movable knife rest 4 and the movable knife 5 to swing around the lower shaft 2 through the thread trimming connecting rod 10 to cut the lower thread and the upper thread. The lower shaft 2 drives the drive cam 3 to continue to rotate synchronously, the ball 11 crosses the highest point of the profile surface 32 of the thread trimming cam, the electromagnet is powered off, and the reset spring 17 resets the reset piece 12 and the thread trimming cam crank 8; Thread trimming crank 9, movable knife rest 4, movable knife 5, thread trimming shaft 7, thread trimming cam crank 8 reset, or reset piece 12 in the case of thread clipping, etc. to make thread trimming crank 9, movable knife rest 4, movable knife 5, The thread trimming shaft 7 and the thread trimming cam crank 8 are forcibly reset. At this point, a thread trimming cycle is completed.

本申请还提供一种缝纫机,包括缝纫机底板1和如上所述的自动剪线机构,所述下轴2可转动地支撑在缝纫机底板1中。The present application also provides a sewing machine, comprising a sewing machine base plate 1 and the above-mentioned automatic thread trimming mechanism, and the lower shaft 2 is rotatably supported in the sewing machine base plate 1 .

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。To sum up, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

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。The above-mentioned embodiments merely illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed in the present invention should still be covered by the claims of the present invention.

Claims (15)

1.一种自动剪线机构,包括可转动支承在缝纫机底板(1)中的下轴(2)、固定在下轴(2)上的剪线驱动凸轮(31)、以及可绕下轴(2)摆动的动刀组件,所述动刀组件具有至少一把动刀(5),其特征在于:还包括与下轴(2)相平行的剪线轴(7)、安装在剪线轴(7)一端的剪线凸轮曲柄(8)、固定在剪线轴(7)另一端的剪线曲柄(9)、以及与剪线凸轮曲柄(8)相固定的复位片(12),所述剪线凸轮曲柄(8)上连接有滚珠(11),所述剪线曲柄(9)通过驱动机构与动刀组件相连接,所述复位片(12)位于剪线凸轮曲柄(8)的左端侧,所述复位片(12)包括左右平直延伸的复位片本体部(121)、以及设在复位片本体部(121)左右两端处的左臂部(122)和右臂部(125),所述右臂部(125)的前后两端处都开设有连接通孔(126),所述复位片(12)在连接通孔(126)处通过螺钉与剪线凸轮曲柄(8)相固定,所述左臂部(122)上具有强制复位部(123)和容剪线轴(7)穿过的通孔(124),所述下轴(2)上固定有强制复位驱动凸轮(33);当滚珠(11)运动至剪线凸轮轮廓面(32)上剪线段的末端时,所述强制复位部(123)近邻于强制复位驱动凸轮(33)外周的强制复位凸轮轮廓面(34);剪线时,所述滚珠(11)和剪线驱动凸轮(31)外周的剪线凸轮轮廓面(32)相配合,所述剪线凸轮曲柄(8)、剪线轴(7)和剪线曲柄(9)同步摆动。1. An automatic thread trimming mechanism, comprising a lower shaft (2) rotatably supported in the bottom plate (1) of a sewing machine, a thread trimming drive cam (31) fixed on the lower shaft (2), and ) swinging movable knife assembly, the movable knife assembly has at least one movable knife (5), characterized in that it further comprises a thread trimming shaft (7) parallel to the lower shaft (2), mounted on the thread trimming shaft (7) A thread trimming cam crank (8) at one end, a thread trimming crank (9) fixed on the other end of the thread trimming shaft (7), and a reset piece (12) fixed with the thread trimming cam crank (8), the thread trimming cam A ball (11) is connected to the crank (8), the thread trimming crank (9) is connected with the moving knife assembly through a driving mechanism, and the reset piece (12) is located on the left end side of the thread trimming cam crank (8), so The reset piece (12) includes a reset piece body portion (121) extending straight from left to right, and a left arm portion (122) and a right arm portion (125) disposed at the left and right ends of the reset piece body portion (121). The front and rear ends of the right arm portion (125) are provided with connecting through holes (126), and the reset piece (12) is fixed to the thread trimming cam crank (8) by screws at the connecting through holes (126), The left arm portion (122) is provided with a forced reset portion (123) and a through hole (124) through which the shearing bobbin (7) passes, and a forced reset drive cam (33) is fixed on the lower shaft (2); When the ball (11) moves to the end of the trimming segment on the trimming cam profile surface (32), the forced reset portion (123) is adjacent to the forced reset cam profile surface (34) on the outer periphery of the forced reset drive cam (33); During thread trimming, the balls (11) cooperate with the thread trimming cam contour surface (32) on the outer periphery of the thread trimming drive cam (31). The thread trimming cam crank (8), thread trimming shaft (7) and thread trimming crank (9) Synchronized swing. 2.根据权利要求1所述的自动剪线机构,其特征在于:还包括动力源(13),该动力源(13)通过传动机构与剪线凸轮曲柄(8)相连接;剪线时,所述动力源(13)动作,通过传动机构驱动剪线凸轮曲柄(8)沿剪线轴(7)的轴向移动,使所述滚珠(11)与剪线凸轮轮廓面(32)相配合,且使所述强制复位部(123)位于强制复位凸轮轮廓面(34)的外周侧。2 . The automatic thread trimming mechanism according to claim 1 , further comprising a power source ( 13 ), the power source ( 13 ) is connected with the thread trimming cam crank ( 8 ) through a transmission mechanism; during thread trimming, The power source (13) is actuated to drive the thread trimming cam crank (8) to move in the axial direction of the thread trimming shaft (7) through the transmission mechanism, so that the ball (11) is matched with the thread trimming cam profile surface (32), And the forced reset portion (123) is positioned on the outer peripheral side of the forced reset cam profile surface (34). 3.根据权利要求2所述的自动剪线机构,其特征在于:所述动力源(13)为电磁铁、具有平行于下轴(2)的芯轴,所述传动机构包括顶杆(14)和顶销(15),所述芯轴的端部固定在顶销(15)中,所述顶杆(14)的一端固定在顶销(15)中,顶杆(14)的另一端与剪线凸轮曲柄(8)的端面相抵接。3 . The automatic thread trimming mechanism according to claim 2 , wherein the power source ( 13 ) is an electromagnet with a mandrel parallel to the lower shaft ( 2 ), and the transmission mechanism comprises an ejector rod ( 14 ). 4 . ) and an ejector pin (15), the end of the mandrel is fixed in the ejector pin (15), one end of the ejector rod (14) is fixed in the ejector pin (15), and the other end of the ejector rod (14) Abut against the end face of the thread trimming cam crank (8). 4.根据权利要求2所述的自动剪线机构,其特征在于:所述剪线轴(7)的外周面上开设有轴向延伸的键槽(71),所述剪线凸轮曲柄(8)与剪线轴(7)通过滑键(16)相连接,所述滑键(16)位于剪线轴(7)的键槽(71)中、并可沿键槽(71)的延伸方向往复滑移。4. The automatic thread trimming mechanism according to claim 2, characterized in that: an axially extending keyway (71) is provided on the outer peripheral surface of the thread trimming shaft (7), and the thread trimming cam crank (8) is connected to the The thread trimming shaft (7) is connected by a sliding key (16), the sliding key (16) is located in the key groove (71) of the thread trimming shaft (7), and can slide back and forth along the extending direction of the key groove (71). 5.根据权利要求2所述的自动剪线机构,其特征在于:还包括固定在剪线轴(7)上的导向块(24)、以及固定在剪线凸轮曲柄(8)上的扭矩传递块(25),所述导向块(24)的外周面上开设有平行于剪线轴(7)的导向槽(241),所述扭矩传递块(25)面向导向块(24)的一端延伸出有导向部(251),所述导向部(251)与导向槽(241)间隙配合、并可沿导向槽(241)的延伸方向往复滑移。5. The automatic thread trimming mechanism according to claim 2, characterized in that it further comprises a guide block (24) fixed on the thread trimming shaft (7), and a torque transmission block fixed on the thread trimming cam crank (8) (25), the outer peripheral surface of the guide block (24) is provided with a guide groove (241) parallel to the thread trimming axis (7), and the end of the torque transmission block (25) facing the guide block (24) extends with a A guide portion (251), the guide portion (251) is in clearance fit with the guide groove (241), and can reciprocate and slide along the extending direction of the guide groove (241). 6.根据权利要求2所述的自动剪线机构,其特征在于:所述剪线凸轮曲柄(8)开设有D字形通孔(81),所述剪线轴(7)上设有一段横截面为D字形的轴连接段(72),所述轴连接段(72)穿设在D字形通孔(81)中、两者间隙配合。6. The automatic thread trimming mechanism according to claim 2, characterized in that: the thread trimming cam crank (8) is provided with a D-shaped through hole (81), and the thread trimming shaft (7) is provided with a section of cross section It is a D-shaped shaft connection section (72), the shaft connection section (72) is penetrated in the D-shaped through hole (81), and the two are in clearance fit. 7.根据权利要求1所述的自动剪线机构,其特征在于:所述剪线轴(7)上套有复位弹簧(17)、并固定有位于挡圈(18),所述挡圈(18)位于剪线曲柄(9)和复位片(12)之间,所述复位弹簧(17)的两端分别与复位片(12)和挡圈(18)相抵接。7 . The automatic thread trimming mechanism according to claim 1 , wherein a return spring ( 17 ) is sleeved on the thread trimming shaft ( 7 ), and a retaining ring ( 18 ) is fixed, and the retaining ring ( 18 ) is fixed. 8 . ) is located between the trimming crank (9) and the reset piece (12), and the two ends of the reset spring (17) are in contact with the reset piece (12) and the retaining ring (18) respectively. 8.根据权利要求1所述的自动剪线机构,其特征在于:所述剪线轴(7)上套有复位扭簧(19),该复位扭簧(19)的两端分别与剪线曲柄(9)和缝纫机底板(1)相抵接。8 . The automatic thread trimming mechanism according to claim 1 , wherein a reset torsion spring ( 19 ) is sleeved on the thread trimmer shaft ( 7 ), and the two ends of the reset torsion spring ( 19 ) are respectively connected to the thread trimming crank. 9 . (9) is in contact with the sewing machine base plate (1). 9.根据权利要求1所述的自动剪线机构,其特征在于:还包括固定于缝纫机底板(1)的定刀(6),所述动刀(5)有一把,所述动刀组件还包括一用于安装动刀(5)的动刀架(4),所述驱动机构包括剪线连杆(10),所述剪线连杆(10)的两端分别与剪线曲柄(9)和动刀架(4)铰接。9 . The automatic thread trimming mechanism according to claim 1 , further comprising a fixed knife ( 6 ) fixed on the bottom plate ( 1 ) of the sewing machine, one movable knife ( 5 ), and one movable knife assembly. 10 . It includes a movable knife holder (4) for installing a movable knife (5), the driving mechanism includes a thread trimming connecting rod (10), and two ends of the thread trimming connecting rod (10) are respectively connected with the thread trimming crank (9). ) and the movable knife holder (4) are hinged. 10.根据权利要求1所述的自动剪线机构,其特征在于:所述动刀(5)有两把、分别为第一动刀(51)和第二动刀(52),所述动刀组件还包括一用于安装第一动刀(51)的第一动刀架(41)、以及用于安装第二动刀(52)的第二动刀架(42),所述驱动机构包括相平行的第一剪线连杆(22)和第二剪线连杆(23),所述剪线曲柄(9)有两个、分别为第一剪线曲柄(94)和第二剪线曲柄(95),所述第一剪线连杆(22)的两端分别与第一剪线曲柄(94)和第一动刀架(41)铰接,所述第二剪线连杆(23)的两端分别与第二剪线曲柄(95)和第二动刀架(42)铰接。10. The automatic thread trimming mechanism according to claim 1, characterized in that: there are two movable knives (5), which are a first movable knife (51) and a second movable knife (52), respectively. The knife assembly further includes a first movable knife rest (41) for installing the first movable knife (51), and a second movable knife rest (42) for installing the second movable knife (52). The driving mechanism It includes a first wire trimmer link (22) and a second wire trimmer link (23) that are parallel, and the wire trimmer cranks (9) have two, which are respectively a first wire trimmer crank (94) and a second wire trimmer A thread crank (95), two ends of the first thread trimming link (22) are respectively hinged with the first thread trimming crank (94) and the first moving tool rest (41), the second thread trimming link ( The two ends of 23) are respectively hinged with the second trimming crank (95) and the second moving tool rest (42). 11.根据权利要求1或9或10所述的自动剪线机构,其特征在于:所述剪线曲柄(9)包括相互独立的曲柄部(91)和连杆部(92),所述曲柄部(91)的一端与剪线轴(7)相固定,曲柄部(91)的另一端与连杆部(92)的一端相固定,连杆部(92)的另一端与所述驱动机构相铰接。11. The automatic thread trimming mechanism according to claim 1, 9 or 10, wherein the thread trimming crank (9) comprises a crank part (91) and a connecting rod part (92) that are independent of each other, and the crank One end of the part (91) is fixed with the thread trimmer shaft (7), the other end of the crank part (91) is fixed with one end of the connecting rod part (92), and the other end of the connecting rod part (92) is connected with the driving mechanism. Hinged. 12.根据权利要求11所述的自动剪线机构,其特征在于:所述曲柄部(91)为粉末冶金件,所述连杆部(92)为钣金件。12. The automatic thread trimming mechanism according to claim 11, wherein the crank part (91) is a powder metallurgy part, and the connecting rod part (92) is a sheet metal part. 13.根据权利要求1所述的自动剪线机构,其特征在于:还包括一呈圆盘状的刀架压套(20),所述刀架压套(20)套在下轴(2)上、并与动刀架(4)背向剪线曲柄(9)的端面相抵接,所述刀架压套(20)通过至少一个紧固螺钉固定于缝纫机底板(1),多个紧固螺钉沿下轴(2)的径向延伸。13. The automatic thread trimming mechanism according to claim 1, characterized in that it further comprises a disc-shaped tool holder pressing sleeve (20), the tool holder pressing sleeve (20) being sleeved on the lower shaft (2) , and is in contact with the end face of the movable knife holder (4) facing away from the thread trimming crank (9). Extends radially of the lower shaft (2). 14.根据权利要求1所述的自动剪线机构,其特征在于:所述缝纫机底板(1)的下端面上设有限位面(101),所述剪线曲柄(9)面向限位面(101)的端面上开设有收容孔(93),该收容孔(93)中内置有弹性垫,所述弹性垫与限位面(101)相配合。14. The automatic thread trimming mechanism according to claim 1, characterized in that: a limit surface (101) is provided on the lower end surface of the sewing machine base plate (1), and the thread trimming crank (9) faces the limit surface (101). The end face of 101) is provided with a receiving hole (93), an elastic pad is built in the receiving hole (93), and the elastic pad is matched with the limiting surface (101). 15.一种缝纫机,包括缝纫机底板(1),其特征在于:还包括如权利要求1-14任一项所述的自动剪线机构,所述下轴(2)可转动地支撑在缝纫机底板(1)中。15. A sewing machine, comprising a sewing machine base plate (1), characterized in that it further comprises the automatic thread trimming mechanism according to any one of claims 1-14, wherein the lower shaft (2) is rotatably supported on the sewing machine base plate (1).
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