CN106868735B - An automatic thread trimming mechanism and sewing machine - Google Patents
An automatic thread trimming mechanism and sewing machine Download PDFInfo
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- 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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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B65/00—Devices for severing the needle or lower thread
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/02—Mechanical drives
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
- D05D2207/00—Use of special elements
- D05D2207/05—Magnetic devices
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Abstract
Description
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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.
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