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CN1268594A - Device for cutting lower thread of sewing machine - Google Patents

Device for cutting lower thread of sewing machine Download PDF

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Publication number
CN1268594A
CN1268594A CN 00104736 CN00104736A CN1268594A CN 1268594 A CN1268594 A CN 1268594A CN 00104736 CN00104736 CN 00104736 CN 00104736 A CN00104736 A CN 00104736A CN 1268594 A CN1268594 A CN 1268594A
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thread
bobbin
bottom line
lower thread
cutting
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CN 00104736
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CN1131905C (en
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立川充宏
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Juki Corp
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Juki Corp
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B73/00—Casings
    • D05B73/04—Lower casings
    • D05B73/12—Slides; Needle plates

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  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

一种缝纫机的底线切断装置。具有与底线卡合,从梭芯抽出给定量的底线的线拉杆4。还设有将抽出的底线切断的底线切断机构20。还设置有捕捉底线的底线捕捉部件33,由此,可确保底线切断机构20切断底线。缝制时底线捕捉部件33移动到不妨碍针的动作的待机位置。切断底线时,与在待机位置底线捕捉部件33捕捉底线的状态相比,底线捕捉部件33移动到能缩短从被缝制物到底线切断机构20的底线切断位置的路径的捕捉部件切断时的位置。

Figure 00104736

The utility model relates to a bobbin thread cutting device of a sewing machine. There is a thread pull bar 4 which engages with the bottom thread and draws out a given amount of bottom thread from the bobbin. A bobbin thread cutting mechanism 20 for cutting the drawn bobbin thread is also provided. A bobbin thread catching part 33 for catching the bobbin thread is also provided, thereby ensuring that the bobbin thread cutting mechanism 20 cuts the bobbin thread. During sewing, the lower thread catching member 33 moves to the standby position where it does not interfere with the movement of the needle. When cutting the bobbin thread, compared with the state where the bobbin thread catching member 33 catches the bobbin thread at the standby position, the bobbin thread catching member 33 moves to a position when the bobbin thread catching member 33 can shorten the path from the sewn object to the bobbin thread cutting position of the bobbin thread cutting mechanism 20. .

Figure 00104736

Description

缝纫机的底线切断装置Bottom thread cutting device for sewing machine

本发明涉及进行锁眼缝制的锁眼缝纫机等中的底线切断装置。The present invention relates to a bobbin thread cutting device in a buttonhole sewing machine or the like for buttonhole sewing.

关于锁眼缝纫机中的这种缝纫机的底线切断装置如日本特公平7-59266号公报所记载的公知的技术，将根据图8～图11进行说明。The bobbin thread cutting device of this type of sewing machine among buttonhole sewing machines is described in Japanese Patent Application Publication No. 7-59266, and will be described with reference to FIGS. 8 to 11 .

针板台8固定支承在缝纫机头(图中未示出)上，在该针板台8上固定有针板5。在针板台8上形成作为底线切断机构20的动作领域的挖通部8b。在针板15上设有细长状针孔15a和在与针孔15a长度方向垂直的方向上的长切刀通孔15b。缝纫针(图中省略)在针孔15a长度方向的范围内摆动的同时，在该摆动位置穿过针孔15a上下地运动。The needle board stand 8 is fixedly supported on the sewing machine head (not shown in the figure), and the needle board 5 is fixed on the needle board stand 8 . On the needle plate base 8, a cut-out portion 8b is formed as an operating range of the lower thread cutting mechanism 20. As shown in FIG. The needle plate 15 is provided with an elongated needle hole 15a and a long cutter through hole 15b in a direction perpendicular to the length direction of the needle hole 15a. A sewing needle (not shown in the drawing) moves up and down through the needle hole 15a at the swing position while swinging within the range in the longitudinal direction of the needle hole 15a.

底线拉杆140在针板台8的下方，以支轴140a为中心可转动地支承在机架上，在底线拉杆140上，在给定范围内可转动地支承有拉板41。该底线拉杆140在一次缝制结束后，在下次的缝制时用来从梭心拉出一定量的底线。The lower thread pull bar 140 is rotatably supported on the frame around the support shaft 140a below the needle plate table 8, and the lower thread pull bar 140 is rotatably supported within a predetermined range by the pull plate 41 . The bobbin thread pull bar 140 is used to pull out a certain amount of bobbin thread from the bobbin during the next sewing after one sewing is completed.

固定在针板台8下面的底线捕捉板131能保证通过底线拉杆140的线拉板41牵拉的底线由底线切断机构20切断。The bottom thread catching plate 131 fixed below the needle plate platform 8 can ensure that the bottom thread pulled by the thread pulling plate 41 of the bottom thread pull bar 140 is cut off by the bottom thread cutting mechanism 20 .

底线切断机构20由以上下顺序层叠的底线下切刀1、底线上切刀2、压线弹簧3组成。底线下切刀1以轴1 a为中心可转动地支承在针板台8上，底线上切刀2相对底线下切刀1以轴2a为中心可转动地支承着。而且，底线下切刀1和线拉杆4相对连杆6的两端分别可转动地连接在轴6a和轴6b上。Bottom thread cutting mechanism 20 is composed of bobbin thread lower cutter 1, bobbin thread cutter 2, and thread pressing spring 3 stacked up and down in sequence. The lower thread cutter 1 is rotatably supported on the needle plate platform 8 with the shaft 1a as the center, and the lower thread cutter 2 is rotatably supported with the shaft 2a as the center with respect to the lower thread cutter 1. Moreover, the lower thread cutter 1 and the two ends of the thread pull rod 4 opposite to the connecting rod 6 are rotatably connected to the shaft 6a and the shaft 6b, respectively.

在底线下切刀1上形成有使压线弹簧3相对底线下切刀1定位的固定销1b。该固定销1b穿过底线上切刀2上所形成的长孔2b，其尖端从底线上切刀2的上方突出。而且，压线弹簧3安装在轴2a的底线下切刀1上，同时，压线弹簧3由固定销1 b相对底线下切刀1定位。从而，底线上切刀2可在夹持在底线下切刀1和压线弹簧3之间的状态下转动。A fixing pin 1b for positioning the thread pressure spring 3 relative to the lower thread cutter 1 is formed on the lower thread cutter 1 . The fixed pin 1b passes through the long hole 2b formed on the bottom line cutter 2, and its tip protrudes from the top of the bottom line cutter 2. And, the thread pressing spring 3 is installed on the bottom thread lower cutter 1 of the axle 2a, and simultaneously, the thread pressing spring 3 is positioned relative to the bottom thread lower cutter 1 by the fixed pin 1 b. Thus, the lower thread cutter 2 can rotate while being clamped between the lower thread cutter 1 and the thread pressing spring 3 .

而且，当底线上切刀2以轴2a为中心沿图8所示的顺时针方向转动时，底线上切刀2端部上所形成的切断部2c和底线下切刀1端部上所形成的切断部1c的间隔拉开。同时，切断部2c和压线弹簧3端部上所形成的压线部3c的间隔拉开。而且，当底线上切刀2沿反时针方向转动时，切断部1c和切断部2c则象剪刀那样关闭间隔，就能切断底线。Moreover, when the lower thread cutter 2 rotates clockwise around the shaft 2a in the clockwise direction shown in FIG. The intervals between the cutting parts 1c are widened. Simultaneously, the distance between the cut-off portion 2c and the thread-pressing portion 3c formed on the end of the thread-pressing spring 3 is opened. And, when the bottom thread cutter 2 rotates in the counterclockwise direction, the cutting part 1c and the cutting part 2c then close the gap like scissors, and the bottom thread can be cut off.

在切断部1c和切断部2c闭合的同时，切断部2c和压线部3c的间隔也闭合，由此，在比剪刀更靠近梭心的位置夹持住底线，以便能将底线保持在梭心一侧。When the cutting part 1c and the cutting part 2c are closed, the gap between the cutting part 2c and the thread pressing part 3c is also closed, thereby clamping the lower thread at a position closer to the bobbin than the scissors, so that the lower thread can be held on the bobbin side.

在底线上切刀2上，沿底线上切刀2的顺时针方向突出地形成有被动部2e。在针板台8上，突出地形成有与该被动部2e对峙的止挡部8a。在底线下切刀1的切断部1c和底线上切刀2的切断部2c隔开的状态下，使底线切断机构20沿顺时针转动之际，被动部2e与止挡部8a接触(图9)，接触之后，当底线切断机构20进一步转动时，由于底线上切刀2与止挡部8a是卡合的而反时针转动。结果，切断部1c和切断部2c闭合。在这种切断底线的状态下，该切断部1c和切断部2c的切断位置设定在针孔15a的下方位置。On the bottom thread cutter 2, a passive portion 2e is formed protrudingly in the clockwise direction of the bottom thread cutter 2. As shown in FIG. On the needle plate base 8, a stopper portion 8a facing the passive portion 2e is protrudingly formed. When the lower thread cutting mechanism 20 is rotated clockwise in a state where the cutting portion 1c of the lower thread cutter 1 and the cutting portion 2c of the lower thread cutter 2 are spaced apart, the driven portion 2e comes into contact with the stopper portion 8a (Fig. 9) , after the contact, when the lower thread cutting mechanism 20 is further rotated, the lower thread cutter 2 is engaged with the stopper 8a and rotates counterclockwise. As a result, the cutting portion 1c and the cutting portion 2c are closed. In this state of cutting the bobbin thread, the cutting position of the cutting portion 1c and the cutting portion 2c is set at a position below the needle hole 15a.

而且，在底线上切刀2上突设有被动销2d。略呈T字形的施力部件11以轴11a为中心可转动地支承在针板台8上，并通过轴11b可转动地连接在杆12的一端上。杆12沿图8右方移动时，施力部件11在杆12的牵引下反时针转动。该施力部件11的卡合部11c推压底线上切刀2的被动销2d，底线上切刀2相对底线下切刀1及压线弹簧3沿顺时针转动，将切断部1c和切断部2c的间隔拉开。Furthermore, a driven pin 2d protrudes from the bottom line cutter 2 . The substantially T-shaped urging member 11 is rotatably supported on the needle plate base 8 around the shaft 11a, and is rotatably connected to one end of the rod 12 via the shaft 11b. When the rod 12 moves to the right in FIG. 8 , the force applying member 11 rotates counterclockwise under the pull of the rod 12 . The engaging part 11c of the force applying member 11 pushes the passive pin 2d of the lower thread cutter 2, and the lower thread cutter 2 rotates clockwise relative to the lower thread cutter 1 and the thread pressing spring 3, and the cutting part 1c and the cutting part 2c are rotated clockwise. spaced apart.

该底线上切刀2的被动销2d、施力部件11及连杆12构成剪刀打开机构10。The passive pin 2d of the cutting knife 2 on the bottom line, the urging member 11 and the connecting rod 12 constitute a scissors opening mechanism 10 .

根据这种以往的结构，在缝制中如图8所示，底线下切刀1和底线上切刀2在剪刀打开机构10的作用下成为打开状态。当底线下切刀1通过连杆6与底线拉杆140联动、沿顺时针方向转动时，与底线下切刀1连接的底线上切刀2和压线弹簧3沿针孔5a的长度方向移动，由此，通过与线拉杆140的线拉板41的尖端的协动，在针孔15a附近捕捉底线，使其处在底线切断前的状态。在这种状态下，由底线下切刀1的切断部1c和底线上切刀2的切断部2c构成的剪刀间存在有底线。According to such a conventional structure, during sewing, as shown in FIG. When the lower thread cutter 1 is linked with the lower thread pull rod 140 through the connecting rod 6 and rotates clockwise, the lower thread cutter 2 connected to the lower thread cutter 1 and the thread pressure spring 3 move along the length direction of the needle hole 5a, thereby , by cooperating with the tip of the thread pull plate 41 of the thread pull rod 140, the bobbin thread is caught near the needle hole 15a, so that it is in the state before the bobbin thread is cut off. In this state, the lower thread exists between the scissors constituted by the cutting portion 1c of the lower thread cutter 1 and the cutting portion 2c of the lower thread cutter 2 .

缝制结束后，缝纫针在对应于在针孔15a的长度方向内的给定位置的位置处停止，底线处在从布经过针孔15a到达梭心的状态。这时，通过踏板等的操作，连杆5向图8上方移动，由此，线拉杆140朝反时针方向转动，下次缝制时所必须的一定量的底线通过线拉板41从梭心(图中未示出)上放出的同时，该底线由底线捕捉板131的底线导向部131a导向(图9)。After sewing is finished, the sewing needle stops at a position corresponding to a given position in the lengthwise direction of the needle hole 15a, and the bobbin thread is in a state of reaching the bobbin from the cloth through the needle hole 15a. At this time, through the operation of the pedal, etc., the connecting rod 5 moves upward in FIG. (not shown in the figure) while being fed out, the lower thread is guided by the lower thread guide portion 131a of the lower thread catching plate 131 (FIG. 9).

线拉板41继续沿反时针方向移动，把底线从梭心抽出，另一方面，底线切断机构20沿顺时针方向转动。而且在底线上切刀2的一端侧上形成的被动部2 e与针板台8上的止挡部8a接触。之后，如图10所示，通过底线下切刀1继续向顺时针方向的转动，底线上切刀2的切断部2c和底线下切刀1的切断部1c闭合，切断底线，同时，底线端部保持在压线弹簧3和底线上切刀2上。之后，连杆5向如图8所示的待机位置移动，变成下次循环的待机状态。The thread pulling plate 41 continues to move in the counterclockwise direction, and the bottom thread is extracted from the bobbin. On the other hand, the bottom thread cutting mechanism 20 rotates in the clockwise direction. And the driven part 2 e that forms on the one end side of cutting knife 2 on the bottom line contacts with stopper 8 a on the needle plate platform 8. Afterwards, as shown in Figure 10, when the lower thread cutter 1 continues to rotate in the clockwise direction, the cutting portion 2c of the lower thread cutter 2 and the cutting portion 1c of the lower thread cutter 1 are closed to cut the lower thread, and at the same time, the end of the lower thread remains On the pressure spring 3 and the lower thread cutter 2. Thereafter, the link 5 moves to the standby position shown in FIG. 8, and becomes the standby state of the next cycle.

但是，在上述以往的底线切断装置中，由于底线捕捉板131固定在针板台8上，所以缝制中底线捕捉板131特别容易妨碍针的动作，如图11所示，有必要使底线捕捉板131处在与针板15的针孔15a错开一定距离以上的位置，因此，切断的底线从被缝制物到切断末端的长度、即底线的剩余长度较长，存在着外表不美观的弊病。However, in the above-mentioned conventional lower thread cutting device, since the lower thread catching plate 131 is fixed on the needle plate platform 8, the lower thread catching plate 131 is particularly likely to hinder the movement of the needle during sewing. The plate 131 is located at a position more than a certain distance away from the needle hole 15a of the needle plate 15. Therefore, the length of the cut bobbin thread from the sewing object to the cut end, that is, the remaining length of the bobbin thread is long, and there is a disadvantage of unsightly appearance. .

因此，本发明的目的是提供一种能缩短被缝制物的底线剩余长度的缝纫机的底线切断装置。Therefore, an object of the present invention is to provide a bobbin thread cutting device of a sewing machine capable of shortening the remaining bobbin thread length of a sewn object.

为了解决以上问题，技术方案1的发明为一种缝纫机的底线切断装置，具有：通过缝纫机针板上所形成的针孔与自被缝制物到梭芯的底线卡合，在与底线交叉的方向上拽拉底线，从梭芯抽出给定量的底线的线拉杆；配置在针板下方，通过切线动作将上述线拉杆抽出的底线在针孔近旁切断的底线切断机构，其特征是，还包括：在上下方向配置在针板与底线切断机构之间，可在位于针孔下方的作用位置和不妨碍针动作的离开针孔的待机位置移动的底线捕捉部件；使底线捕捉部件在缝置时处在待机位置，缝制后且在底线切断机构切断底线动作之前，从待机位置移动到作用位置的底线捕捉部件移动机构。In order to solve the above problems, the invention of technical scheme 1 is a bottom thread cutting device of a sewing machine, which has the following features: through the pinhole formed on the needle plate of the sewing machine, the bottom thread from the object to be sewn to the bobbin is engaged, and when the bottom thread intersects with the bottom thread, Pull the bottom thread in the direction to draw out a given amount of bottom thread from the bobbin. The bottom thread cutting mechanism is arranged under the needle plate and cuts the bottom thread pulled out by the above thread pull rod near the needle hole through the thread tangential action. It is characterized in that it also includes : Arranged between the needle plate and the lower thread cutting mechanism in the up and down direction, the lower thread catching part can move between the active position below the needle hole and the standby position away from the needle hole without hindering the movement of the needle; the lower thread catching part can be moved when sewing In the standby position, after sewing and before the bobbin thread cutting mechanism cuts the bobbin thread, it moves from the standby position to the active position.

根据技术方案1记载的发明，缝制时通过底线捕捉部件移动机构把底线捕捉部件移动到待机位置，因此底线捕捉部件不会妨碍针的动作。另外，切断底线时，通过底线捕捉部件移动机构使底线捕捉部件位于针孔下方的作用位置，因而可缩短底线切断后的自被缝制物的底线剩余长度。According to the invention described in claim 1, the lower thread catching member is moved to the standby position by the lower thread catching member moving mechanism during sewing, so the lower thread catching member does not interfere with the movement of the needle. In addition, when the bobbin thread is cut, the bobbin thread catching part moving mechanism makes the bobbin thread catching part in the active position below the needle hole, so the remaining length of the bobbin thread from the sewn object after the bobbin thread is cut can be shortened.

技术方案2记载的发明的特征是，在技术方案1记载的缝纫机的底线切断装置中，从待机位置移动到作用位置时，上述底线捕捉部件捕捉通过针孔的底线，并将其导引到针孔下面。The invention described in claim 2 is characterized in that, in the bobbin thread cutting device of the sewing machine according to claim 1, when moving from the standby position to the action position, the bobbin thread catching member catches the bobbin thread passing through the needle hole and guides it to the needle. below the hole.

根据技术方案2记载的本发明，由于上述底线捕捉部件捕捉通过针孔的底线，将其导向针孔下方，能缩短从被缝制物到底线切断机构的切断位置的路径。从而，可缩短底线切断后的自被缝制物的底线剩余长度。According to the present invention described in claim 2, since the bobbin thread catching member catches the bobbin thread passing through the needle hole and guides it below the needle hole, the path from the sewing object to the cutting position of the thread cutting mechanism can be shortened. Therefore, the remaining length of the bobbin thread from the object to be sewn after the bobbin thread is cut can be shortened.

技术方案3记载的发明的特征是，在技术方案1记载的缝纫机的底线切断装置中，从上述待机位置移动到作用位置时改变底线路径，以便缩短从被缝制物到底线切断机构的底线切断位置的路径。The invention described in claim 3 is characterized in that, in the bobbin thread cutting device of the sewing machine according to claim 1, the path of the bobbin thread is changed when moving from the standby position to the active position so as to shorten the bobbin thread cutting from the sewn object to the bobbin thread cutting mechanism. The path to the location.

根据技术方案3记载的本发明，从上述待机位置移动到作用位置之际，由于能改变底线路径，以便缩短从被缝制物到底线切断机构的底线切断位置的路径，从而能缩短从被缝制物到底线切断机构的切断位置的路径。所以可缩短底线切断后的自被缝制物的底线剩余长度。According to the present invention described in claim 3, when moving from the above-mentioned standby position to the active position, the path of the bobbin thread can be changed so as to shorten the path from the sewn object to the bobbin thread cutting position of the bobbin thread cutting mechanism. The path of the product to the cutting position of the thread cutting mechanism. Therefore, the remaining length of the bobbin thread from the object to be sewn after the bobbin thread is cut can be shortened.

技术方案4记载的发明的特征是，在技术方案1记载的缝纫机的底线切断装置中，上述线拉杆和上述底线捕捉部件通过凸轮部而卡合，通过上述线拉杆的驱动改变上述凸轮部的卡合状态，驱动上述底线捕捉部件。The invention described in claim 4 is characterized in that, in the bobbin thread cutting device for sewing machine according to claim 1, the thread puller and the bobbin thread catching member are engaged by a cam part, and the engagement of the cam part is changed by driving the thread puller. In the closed state, the above-mentioned lower thread catcher is driven.

根据技术方案4记载的本发明，线拉杆和底线捕捉部件通过凸轮部而卡合，通过线拉杆的驱动改变凸轮部的卡合状态，驱动底线捕捉部件，因此，驱动线拉杆的驱动源和驱动底线捕捉部件的驱动源是共同的，可以使该机构的结构紧凑。According to the present invention described in claim 4, the thread rod and the lower thread catching member are engaged by the cam portion, and the engagement state of the cam portion is changed by driving the thread rod to drive the lower thread catching member. The driving source of the bobbin thread catching parts is common, and the structure of the mechanism can be made compact.

技术方案5记载的发明的特征是，在技术方案1记载的缝纫机的底线切断装置中，还包括通过操作驱动的摆动部件，上述线拉杆及底线捕捉部件通过连杆与上述摆动部件连接，通过上述摆动部件的驱动，驱动上述线拉杆和底线捕捉部件。The invention described in claim 5 is characterized in that, in the bobbin thread cutting device of the sewing machine according to claim 1 , further comprising a swing member driven by operation, the above thread lever and the bobbin thread catching member are connected to the swing member through a link, The drive of the swinging member drives the above-mentioned thread puller and the lower thread catching member.

根据技术方案5记载的发明，通过操作摆动部件进行驱动，可以驱动经连杆与摆动部件连接的线拉杆和底线捕捉部件，因而能实现驱动线拉杆的驱动源和驱动底线捕捉部件的驱动源采用同一驱动源。According to the invention described in claim 5, by operating the swing member to drive, the thread pull rod and the lower thread catching member connected to the swing member via the link can be driven, so that the driving source for driving the thread pull rod and the driving source for driving the lower thread catching member can be adopted. same drive source.

根据技术方案1记载的本发明的缝纫机的底线切断装置，缝制时通过底线捕捉部件移动机构把底线捕捉部件移动到待机位置，因此底线捕捉部件不会妨碍针的动作。另外，切断底线时，通过底线捕捉部件移动机构使底线捕捉部件位于针孔下方的作用位置，因而可缩短底线切断后的自被缝制物的底线剩余长度。According to the lower thread cutting device of the sewing machine of the present invention described in claim 1, the lower thread catching member moving mechanism moves the lower thread catching member to the standby position during sewing, so that the lower thread catching member does not hinder the movement of the needle. In addition, when the bobbin thread is cut, the bobbin thread catching part moving mechanism makes the bobbin thread catching part in the active position below the needle hole, so the remaining length of the bobbin thread from the sewn object after the bobbin thread is cut can be shortened.

根据技术方案2记载的本发明，由于上述底线捕捉部件捕捉通过针孔的底线，将其导向针孔下方，能缩短从被缝制物到底线切断机构的切断位置的路径。从而，可缩短底线切断后的自被缝制物的底线剩余长度。According to the present invention described in claim 2, since the bobbin thread catching member catches the bobbin thread passing through the needle hole and guides it below the needle hole, the path from the sewing object to the cutting position of the thread cutting mechanism can be shortened. Therefore, the remaining length of the bobbin thread from the object to be sewn after the bobbin thread is cut can be shortened.

根据技术方案3记载的本发明，从上述待机位置移动到作用位置之际，由于能改变底线路径，以便缩短从被缝制物到底线切断机构的底线切断位置的路径，从而能缩短从被缝制物到底线切断机构的切断位置的路径。所以可缩短底线切断后的自被缝制物的底线剩余长度。According to the present invention described in claim 3, when moving from the above-mentioned standby position to the active position, the path of the bobbin thread can be changed so as to shorten the path from the sewn object to the bobbin thread cutting position of the bobbin thread cutting mechanism. The path of the product to the cutting position of the thread cutting mechanism. Therefore, the remaining length of the bobbin thread from the object to be sewn after the bobbin thread is cut can be shortened.

根据技术方案4记载的本发明，线拉杆和底线捕捉部件通过凸轮部而卡合，通过线拉杆的驱动改变凸轮部的卡合状态，驱动底线捕捉部件，因此，驱动线拉杆的驱动源和驱动底线捕捉部件的驱动源是共同的，可以使该机构的结构紧凑。According to the present invention described in claim 4, the thread rod and the lower thread catching member are engaged by the cam portion, and the engagement state of the cam portion is changed by driving the thread rod to drive the lower thread catching member. The driving source of the bobbin thread catching parts is common, and the structure of the mechanism can be made compact.

根据技术方案5记载的本发明，通过操作摆动部件进行驱动，可以驱动经连杆与摆动部件连接的线拉杆和底线捕捉部件，因而能实现驱动线拉杆的驱动源和驱动底线捕捉部件的驱动源采用同一驱动源。According to the present invention described in claim 5, by operating the swinging member to drive, the thread puller and the lower thread catcher connected to the swinging member via the link can be driven, so that the driving source for driving the thread puller and the driving source for driving the lower thread catcher can be realized. Use the same drive source.

图1是表示本发明第一实施例的缝纫机的底线切断装置缝制中的状态的仰视图。Fig. 1 is a bottom view showing a state in which a bobbin thread cutting device of a sewing machine according to a first embodiment of the present invention is sewing.

图2是表示本发明第一实施例的缝纫机的底线切断装置切断时的状态的仰视图。Fig. 2 is a bottom view showing a cutting state of the bobbin thread cutting device of the sewing machine according to the first embodiment of the present invention.

图3是表示本发明第一实施例的缝纫机的底线切断装置动作结束时的状态的仰视图。Fig. 3 is a bottom view showing a state in which the operation of the bobbin thread cutting device of the sewing machine according to the first embodiment of the present invention is completed.

图4是说明底线切断状态的针孔近旁的侧剖视图。Fig. 4 is a side cross-sectional view illustrating the vicinity of the needle hole in a state in which the lower thread is cut.

图5是表示本发明第二实施例的缝纫机的底线切断装置缝制中的状态的图。Fig. 5 is a diagram showing a state in which the bobbin thread cutting device of the sewing machine according to the second embodiment of the present invention is sewing.

图6是表示本发明第二实施例的缝纫机的底线切断装置动作结束时的状态的仰视图。Fig. 6 is a bottom view showing a state in which the operation of the bobbin thread cutting device of the sewing machine according to the second embodiment of the present invention is completed.

图7是底线捕捉板和连杆的分解立体图。Fig. 7 is an exploded perspective view of the lower thread catching plate and the link.

图8是以往的缝纫机的底线切断装置缝制中的状态的仰视图。Fig. 8 is a bottom view of a state in which the bobbin thread cutting device of the conventional sewing machine is sewing.

图9是表示以往的缝纫机的底线切断装置动作时的状态的仰视图。Fig. 9 is a bottom view showing a state in which the bobbin thread cutting device of the conventional sewing machine is in operation.

图10是表示以往的缝纫机的底线切断装置动作结束时的状态的仰视图。Fig. 10 is a bottom view showing a state in which the operation of the bobbin thread cutting device of the conventional sewing machine is completed.

图11是说明以往的底线切断状态的针孔近旁的侧剖视图。Fig. 11 is a side cross-sectional view illustrating the vicinity of the needle hole in a conventional bobbin thread cutting state.

第一实施例first embodiment

以下，参照图1至图4说明本发明的第一实施例。另外，第一实施例中与现有技术相同的构成用同一符号表示且说明省略。Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 4 . In addition, in the first embodiment, the same components as those in the prior art are denoted by the same symbols and their descriptions are omitted.

线拉杆4具有以轴4a为中心转动且安装在针板台8上的作为底线捕捉部件移动机构的本体40，以及用螺钉4b固定在本体40尖端部的线拉板41。The thread lever 4 has a main body 40 as a moving mechanism for the bobbin thread catching member that rotates around the shaft 4a and is mounted on the needle plate base 8, and a thread pull plate 41 fixed to the tip of the main body 40 with a screw 4b.

线拉杆4通过轴5a可转动地连接在连杆5的一端上，该连杆5的另一端通过轴5b和摆动部件7可转动地连接在一起。通过该摆动部件7以轴7a为中心沿顺时针方向的摆动，借助连杆5使线拉杆4以反时针方向转动。相反，通过摆动部件7沿反时针方向的摆动，使线拉杆4以顺时针方向转动。缝制中摆动部件7通过驱动机构(图中未示出)成为图1所示的状态。The wire pull rod 4 is rotatably connected to one end of a link 5 through a shaft 5a, and the other end of the link 5 is rotatably connected together with a swing member 7 through a shaft 5b. As the swing member 7 swings clockwise about the shaft 7a, the cord lever 4 rotates counterclockwise via the link 5 . On the contrary, by swinging the swing member 7 in the counterclockwise direction, the thread lever 4 is rotated in the clockwise direction. During sewing, the swing member 7 is in the state shown in FIG. 1 by a drive mechanism (not shown).

当线拉杆4沿反时针方向转动时，与这种运动联动，通过连杆6使上述底线切断机构20作顺时针方向的转动。相反，当线拉杆4沿顺时针方向转动时，使上述底线切断机构20作反时针方向的转动。这样，由于线拉杆4的线拉板41通过轴6b相对于本体40定位，所以，线拉杆4的本体40可与线拉板41一体地动作。When the thread pull rod 4 rotates in the counterclockwise direction, in conjunction with this movement, the above-mentioned bobbin thread cutting mechanism 20 is rotated in the clockwise direction through the connecting rod 6 . On the contrary, when the thread pull lever 4 rotates clockwise, the bobbin thread cutting mechanism 20 is rotated counterclockwise. In this way, since the wire pull plate 41 of the wire pull rod 4 is positioned relative to the body 40 through the shaft 6b, the body 40 of the wire pull rod 4 can act integrally with the wire pull plate 41 .

在线拉杆4上连续地形成有凸轮部40c和凸轮部40d。A cam portion 40c and a cam portion 40d are continuously formed on the tie rod 4 .

当线拉杆4沿反时针方向转动时，线拉板41尖端的卡合部41a通过针孔15a与从被缝制物到达梭心(图中未示出)的底线卡合，在与该底线交叉的方向上牵拉底线，这样，能从梭心上将给定量的底线抽出。When the thread pull bar 4 rotates in the counterclockwise direction, the engagement portion 41a at the tip of the thread pull plate 41 is engaged with the bottom thread from the sewn object to the bobbin (not shown in the figure) through the pinhole 15a. Pull the lower thread in the cross direction so that a given amount of lower thread can be pulled out from the bobbin.

保持板30通过轴30a可转动地支承在针板台8上，在保持板30的前端，用螺钉31b、31c固定有底线捕捉板31。该底线捕捉板31和保持板30构成本发明的底线捕捉部件33。The holding plate 30 is rotatably supported by the needle plate base 8 via a shaft 30a, and a lower thread catching plate 31 is fixed to the front end of the holding plate 30 by screws 31b, 31c. The bobbin thread catching plate 31 and the holding plate 30 constitute the bobbin thread catching member 33 of the present invention.

另外，安装在保持板30基端的拉伸弹簧32以使底线捕捉部件33沿顺时针方向转动的方式作用着。In addition, a tension spring 32 attached to the base end of the holding plate 30 acts to rotate the lower thread catching member 33 in the clockwise direction.

在底线捕捉板31上形成有底线导向部31a，该底线导向部31a在切断底线时捕捉底线，对底线的路径进行导向，并作成中间细的V字形结构。The lower thread guide part 31a is formed on the lower thread catching plate 31, and the lower thread guide part 31a catches the lower thread when cutting the lower thread, guides the path of the lower thread, and is made into a thin V-shaped structure in the middle.

在保持板30上设置有凸轮部30c和凸轮部30b，凸轮部30c在朝图1上方突出的突出部30A的尖端上形成，可与凸轮部40d卡合，凸轮部30b在突出部30A的侧部形成，并可与上述凸轮部40c卡合。The holding plate 30 is provided with a cam portion 30c and a cam portion 30b. The cam portion 30c is formed on the tip of the protruding portion 30A protruding upward in FIG. part is formed, and can be engaged with the above-mentioned cam part 40c.

上述的凸轮部40c、凸轮部40d、凸轮部30c、凸轮部30b及拉伸弹簧32构成底线捕捉部件移动机构。The above-mentioned cam portion 40c, cam portion 40d, cam portion 30c, cam portion 30b, and tension spring 32 constitute a bobbin thread catching member moving mechanism.

当底线捕捉部件33沿顺时针方向转动时，在凸轮部30c与凸轮部40d接触期间限制了保持板30的运动(图2、图3)，使底线捕捉部件33的转动停止。这样，底线捕捉部件33停止时的底线捕捉部件33的位置是作用位置。而且，在该作用位置，底线导向部31a，换言之底线捕捉部件33的底线捕捉部位在上下方向与针孔15a重合。另外，在该作用位置，底线导向部31a最好设定在针孔15a的大致中心正下方位置。When the lower thread catching member 33 rotates clockwise, the movement of the retaining plate 30 is restricted during the contact between the cam portion 30c and the cam portion 40d ( FIGS. 2 , 3 ), so that the rotation of the lower thread catching member 33 is stopped. In this way, the position of the lower thread catching member 33 when the lower thread catching member 33 stops is the active position. In this active position, the bobbin thread guide 31a, in other words, the bobbin thread catching portion of the bobbin thread catching member 33 overlaps with the needle hole 15a in the vertical direction. In addition, in this active position, the lower thread guide 31a is preferably set at a position substantially directly below the center of the needle hole 15a.

而且，当线拉杆4沿顺时针方向转动时，凸轮部40c与凸轮部30b接触，凸轮部40c一边在凸轮部30b上稍微地滑动，一边压在凸轮部30b上，使底线捕捉部件33沿反时针方向转动。And, when the thread lever 4 rotates clockwise, the cam portion 40c comes into contact with the cam portion 30b, and the cam portion 40c slides slightly on the cam portion 30b while pressing on the cam portion 30b, so that the lower thread catching member 33 moves in the opposite direction. Turn clockwise.

以下，说明这种构成的缝纫机的底线装置的动作。Next, the operation of the bobbin thread device of the sewing machine having such a configuration will be described.

在缝制中，如图1所示，通过连杆5使底线拉杆4处于沿顺时针方向被牵拉状态。这时，随着底线拉杆4的动作，通过连杆6让底线切断机构20处于沿反时针方向转动的状态，底线下切刀1的切断部1c和底线上切刀2的切断部2c分别处于离开针孔15a的状态。与此同时，通过剪刀打开机构10，使切断部1c、2c处于互相打开状态。During sewing, as shown in FIG. 1 , the lower thread pull rod 4 is pulled clockwise through the connecting rod 5 . At this time, with the action of the lower thread pull rod 4, the lower thread cutting mechanism 20 is in the state of rotating counterclockwise through the connecting rod 6, and the cutting part 1c of the lower thread cutter 1 and the cutting part 2c of the lower thread cutter 2 are separated from each other. The state of the pinhole 15a. At the same time, the cutting parts 1c and 2c are opened to each other by the scissors opening mechanism 10 .

另外，底线捕捉部件33的凸轮部33b与线拉杆4的凸轮部40c卡合，克服拉伸弹簧32的拉力，使底线捕捉部件33处在沿反时针方向转动的状态。即，底线捕捉部件33处于使底线捕捉板31不妨碍经过针孔15a的针的动作的待机位置。In addition, the cam portion 33b of the bobbin thread catching member 33 is engaged with the cam portion 40c of the thread lever 4 to overcome the tension of the tension spring 32, so that the bobbin thread catching member 33 is rotated counterclockwise. That is, the lower thread catching member 33 is in the standby position where the lower thread catching plate 31 does not interfere with the movement of the needle passing through the needle hole 15a.

缝制作业结束后，缝纫针处在针孔15a长度方向范围内的任何位置的停止状态，在这种状态下，切断底线时，通过上述驱动机构、例如通过踏板等的操作使摆动部件7沿顺时针方向摆动，借此并通过连杆5让线拉杆4沿反时针方向转动。这时，同时进行下述的①～③的动作。After the sewing operation is finished, the sewing needle is in a stopped state at any position within the lengthwise range of the needle hole 15a. Swing in the clockwise direction, and thereby allow the wire pull rod 4 to rotate in the counterclockwise direction through the connecting rod 5 . At this time, the following operations ① to ③ are performed simultaneously.

①线拉杆4的线拉板41的卡合部41a与底线卡合，将从针至梭心的底线朝与底线路径交叉的方向上拽拉，从梭心上抽出下次缝制所需要的给定量的底线。①The engaging part 41a of the thread pulling plate 41 of the thread lever 4 is engaged with the bobbin thread, and the bobbin thread from the needle to the bobbin is pulled in the direction intersecting with the path of the bobbin thread, and the thread needed for the next sewing is pulled out from the bobbin. Bottom line for a given amount.

在这种结构中，通过线拉杆4拽拉底线的方向与针孔15a的长度方向大体一致，以确保在拽拉底线后由剪刀捕捉底线。In this structure, the direction of pulling the bottom thread through the thread pull rod 4 is substantially consistent with the length direction of the needle hole 15a, so as to ensure that the bottom thread is caught by the scissors after the bottom thread is pulled.

②随着线拉杆4沿反时针方向的转动，保持板30的凸轮部30b由线拉杆4的凸轮部4c的限制得到释放。由于底线捕捉部件33通过拉伸弹簧32朝使其沿顺时针方转动的方向上施力，因此凸轮部30b随着凸轮部4c而动作，从而使底线捕捉部件33在拉伸弹簧32拉力的作用下沿顺时针方向转动。② As the wire rod 4 rotates in the counterclockwise direction, the restriction of the cam portion 30b of the holding plate 30 by the cam portion 4c of the wire rod 4 is released. Since the lower thread catching member 33 is biased toward the clockwise rotation direction by the extension spring 32, the cam portion 30b moves along with the cam portion 4c, so that the lower thread catching member 33 is under the action of the tension of the extension spring 32. Turn it clockwise.

而且，通过保持板30的凸轮部30c与线拉杆4的凸轮部40d的接触，底线捕捉部件33的顺时针方向的转动停止。即，底线捕捉部件33处在作用位置。这时，如图4所示，底线捕捉板31的底线导向部31a的位置在上下方向与针孔15a重合，且底线导向部31a大体处在针孔15a中心的正下方位置。Further, the clockwise rotation of the bobbin thread catching member 33 is stopped by the contact between the cam portion 30c of the holding plate 30 and the cam portion 40d of the thread lever 4 . That is, the lower thread catching member 33 is in the active position. At this time, as shown in FIG. 4 , the position of the bobbin thread guide portion 31 a of the bobbin thread catching plate 31 coincides with the needle hole 15 a in the vertical direction, and the bobbin thread guide portion 31 a is substantially directly below the center of the needle hole 15 a.

在该底线捕捉部件33的转动动作中，底线导向部31a捕捉底线，成为待机位置时的如图4所示的底线路径。即，对底线进行导向，使底线从被缝制物大体地下垂。During the pivoting operation of the lower thread catching member 33, the lower thread guide 31a catches the lower thread, and becomes the lower thread path shown in FIG. 4 in the standby position. That is, the bobbin thread is guided so that the bobbin thread hangs down substantially from the object to be sewn.

还有，对线拉杆4的凸轮部40c、40d或者底线捕捉部件33的凸轮部30b、30c的任何一方的形状进行变更，在上述底线捕捉部件33的转动动作结束后，底线导向部31a能容易地捕捉底线，变更底线的路径。Also, by changing the shape of any one of the cam portions 40c, 40d of the thread lever 4 or the cam portions 30b, 30c of the lower thread catching member 33, the lower thread guiding portion 31a can be easily moved after the rotation of the lower thread catching member 33 is completed. Capture the bottom line accurately and change the path of the bottom line.

在该底线路径变更之际，由于底线导向部31a作成朝底线捕捉板31的移动方向的相反方向中间变细的结构，即使捕捉底线的瞬间位置与底线导向部31a有一定偏离，也可以沿该中间变细的形状把底线诱导到底线导向部31a上，能修正这种偏差，对底线路径导向。When the bobbin thread path is changed, since the bobbin thread guide portion 31a is made to be tapered in the middle in the direction opposite to the moving direction of the bobbin thread catching plate 31, even if there is a certain deviation between the bobbin thread catching moment position and the bobbin thread guiding portion 31a, The tapered shape guides the lower thread to the lower thread guide portion 31a, and this deviation can be corrected to guide the lower thread path.

另外，保持板30的凸轮部30c与线拉杆4的凸轮部40d接触，使底线捕捉部件33的转动停止。并且，在底线捕捉部件33处于作用位置时，切开线拉杆4的驱动和底线捕捉部件33的驱动。这样，只有线拉杆4仅以给定量转动，从梭心将给定量的底线抽出。In addition, the cam portion 30c of the holding plate 30 comes into contact with the cam portion 40d of the thread lever 4 to stop the rotation of the lower thread catching member 33 . And, when the bobbin thread catching member 33 is in the active position, the driving of the thread lever 4 and the driving of the bobbin thread catching member 33 are cut. In this way, only the thread lever 4 is rotated by a given amount, and a given amount of lower thread is drawn out from the bobbin.

即，凸轮部30b、30c、40c、40d作成在线拉杆4的给定移动范围内不将运动传递底线捕捉部件33的形状。That is, the cam portions 30b, 30c, 40c, and 40d are shaped so as not to transmit motion to the lower thread catching member 33 within a predetermined moving range of the thread rod 4 .

③另外，随着线拉杆4朝反时针方向的转动，通过连杆6使底线切断机构20沿顺时针方向转动。于是，切断部2c和压线部3c在比剪刀更靠近梭心的位置捕捉底线。不久，在被动部2e与止挡部8a接触后，被动部2e由止挡部8a施力，使底线上切刀2相对底线下切刀1和压线弹簧3作反时针方向的转动，切断部2c和压线部3c的间隔闭合，由此保持着底线。与此同时，切断部1c和切断部2c的间隔闭合。在这里，由于在切断部1c和切断部2c闭合并切断底线的状态下，该切断部1c和切断部2c的切断位置设定成与针孔15a在上下方向上重合的地方，因此可在针孔15a的正下方将底线切断。③ In addition, as the thread lever 4 rotates in the counterclockwise direction, the lower thread cutting mechanism 20 rotates in the clockwise direction through the link 6 . Then, the cutting portion 2c and the thread pressing portion 3c catch the bobbin thread at a position closer to the bobbin than the scissors. Soon, after the passive part 2e comes into contact with the stop part 8a, the passive part 2e is forced by the stop part 8a, so that the bottom thread cutter 2 rotates counterclockwise relative to the bottom thread bottom cutter 1 and the thread pressure spring 3, and the cutting part The space between 2c and the crimping part 3c is closed, thereby holding the lower thread. At the same time, the gap between the cutting portion 1c and the cutting portion 2c is closed. Here, since the cutting portion 1c and the cutting portion 2c are closed to cut the bobbin thread, the cutting positions of the cutting portion 1c and the cutting portion 2c are set to overlap with the needle hole 15a in the vertical direction. Right below the hole 15a the lower thread is cut off.

在这种切断状态下，如图4所示，底线导向部31a处于针孔15a的大体中心的正下方，对切断时的底线按照图示方式进行导向。In this cutting state, as shown in FIG. 4, the lower thread guide portion 31a is located directly below the approximate center of the needle hole 15a, and guides the lower thread during cutting as shown in the figure.

另外，由于切断底线的同时，在比切断部更靠近梭心的位置，底线端部由压线弹簧3和底线上切刀2保持住，因此通过线拉杆4进行拽拉，保持住多余的长度，就可使从梭心抽出的底线处于下次缝制的待机状态。In addition, since the end of the lower thread is held by the thread pressure spring 3 and the lower thread cutter 2 at a position closer to the bobbin than the cutting part while cutting the lower thread, it is pulled by the thread pull rod 4 to keep the excess length , the bobbin thread drawn from the bobbin will be in the standby state for the next sewing.

在这种结构中，由于切断部2c与切断部1c、以及切断部2c与压线部3c的运动大体与针孔15a的长度方向一致，因而与缝制结束后针的停止位置无关，通常，在底线切断机构20转动的任何时间里，可为切断和保持而捕捉底线。In this structure, since the movement of the cutting part 2c and the cutting part 1c, and the movement of the cutting part 2c and the crimping part 3c is generally consistent with the length direction of the needle hole 15a, it has nothing to do with the stop position of the needle after sewing. Usually, At any time the lower thread cutting mechanism 20 is rotating, the lower thread is caught for both cutting and holding.

这样，由于在底线导向部31a处在针孔15a的大体中心正下方的状态下的作用位置配置底线捕捉部件33，在这种状态下，通过底线导向部31a对底线导向，切断底线，因此能将从被缝制物到底线切断机构20的底线切断位置的路径缩短到最小限度。In this way, since the lower thread catching member 33 is disposed at the operating position where the lower thread guide portion 31a is substantially directly below the center of the needle hole 15a, in this state, the lower thread is guided by the lower thread guide portion 31a to cut the lower thread. The path from the sewn object to the bobbin thread cutting position of the bobbin thread cutting mechanism 20 is shortened to the minimum.

即，从被缝制物到底线切断机构20的底线切断位置的路径，在缝制结束后根据针停止的位置而变化，但由于底线导向部31a保持在针孔15a的大体中心正下方的状态，因而在针的停止位置位于针孔15a的长度方向一侧的场合及位于相反一侧的场合，底线的剩余长度基本相等。结果，消除了象在底线导向部31a不与针孔15a对应的情况下那样，当针的停止位置处在针孔15a的长度方向一侧时底线剩余长度非常长的问题。再者，如果针的停止位置始终处在针孔15a的长度方向的中心，则总能将被缝制物的底线剩余长度缩短到最短。That is, the path from the object to be sewn to the bobbin thread cutting position of the bobbin thread cutting mechanism 20 changes according to the position where the needle stops after the sewing is finished, but since the bobbin thread guide 31a is kept substantially directly below the center of the needle hole 15a Therefore, when the stop position of the needle is located on one side in the longitudinal direction of the needle hole 15a and on the opposite side, the remaining length of the bobbin thread is substantially equal. As a result, the problem that the remaining length of the lower thread is very long when the needle stop position is on the lengthwise side of the needle hole 15a as in the case where the lower thread guide portion 31a does not correspond to the needle hole 15a is eliminated. Furthermore, if the stop position of the needle is always at the center of the length direction of the needle hole 15a, the remaining length of the bottom thread of the sewn object can always be shortened to the shortest.

其次，为了下次缝制作业的开始，驱动机构使摆动部件7沿反时针方向转动，由此并通过连杆5使线拉杆4沿顺时针方向转动。Next, in order to start the sewing operation next time, the driving mechanism rotates the swing member 7 in the counterclockwise direction, thereby causing the thread pull bar 4 to rotate in the clockwise direction through the connecting rod 5 .

这时，同时进行以下所述的①、②动作。At this time, the following operations ① and ② are performed simultaneously.

①通过连杆6使底线切断机构20沿反时针方向转动，剪刀离开针孔15a。① Turn the lower thread cutting mechanism 20 counterclockwise through the connecting rod 6, and the scissors leave the needle hole 15a.

②随着线拉杆4沿顺时针方向的转动，通过线拉杆4的凸轮部40c对保持板30的凸轮部30b向反时针方向施力，底线捕捉部件33克服拉伸弹簧32的张力沿反时针方向转动，底线捕捉板31的底线导向部31a离开针孔15a。于是，底线捕捉部件33移动到缝制时不妨碍针的动作的待机位置。②As the thread lever 4 rotates in the clockwise direction, the cam portion 40c of the thread lever 4 exerts force on the cam portion 30b of the holding plate 30 in the counterclockwise direction, and the bobbin thread catcher 33 overcomes the tension of the tension spring 32 and rotates counterclockwise. direction, the lower thread guide portion 31a of the lower thread catching plate 31 leaves the needle hole 15a. Then, the bobbin thread catching member 33 moves to the standby position where the operation of the needle is not hindered during sewing.

由此，在轴30a、凸轮部30b、凸轮部30c、本体40、凸轮部40c、凸轮部40d、拉伸弹簧32、连杆5等构成的底线捕捉部件移动机构的作用下，在切断底线和缝制作业时，由于和线拉杆4的转动联动的底线捕捉部件33能分别移动到作用位置或待机位置，因此，驱动线拉杆4的驱动源和驱动底线捕捉部件33的驱动源是共同的，并且可以使该机构的结构紧凑。Thus, under the action of the bobbin thread catching member moving mechanism composed of shaft 30a, cam portion 30b, cam portion 30c, body 40, cam portion 40c, cam portion 40d, tension spring 32, connecting rod 5, etc., the bobbin thread is cut and the bobbin thread is cut. During the sewing operation, since the bobbin thread catching part 33 linked with the rotation of the thread pull bar 4 can move to the action position or the standby position respectively, the driving source for driving the thread pull bar 4 and the driving source for driving the bobbin thread catching part 33 are common, And the structure of the mechanism can be made compact.

根据本发明第一实施例的缝纫机的底线切断装置，由于在缝制时可通过底线捕捉部件移动机构使底线捕捉部件33移动到待机位置，因而底线捕捉部件33不会妨碍针的动作，同时，在切断底线时，借助于底线捕捉部件移动机构，与在待机位置通过底线捕捉部件33捕捉底线的状态相比，底线捕捉部件33移动到缩短了自被缝制物到底线切断机构20的底线切断位置的路径的作用位置，因此缩短了底线切断后的自被缝制物余下的底线剩余长度。从而，可缝制出外观美观的钮扣孔。According to the bobbin thread cutting device of the sewing machine of the first embodiment of the present invention, since the bobbin thread catching part 33 can be moved to the standby position by the bobbin thread catching part moving mechanism during sewing, the bobbin thread catching part 33 will not hinder the action of the needle, and at the same time, When cutting the bobbin thread, by means of the bobbin thread catching part moving mechanism, the bobbin thread catching part 33 moves to shorten the bobbin thread cutting from the sewn object to the bobbin thread cutting mechanism 20 compared with the state where the bobbin thread catching part 33 catches the bobbin thread at the standby position. Therefore, the remaining length of the bobbin thread remaining from the sewn object after the bobbin thread is cut is shortened. Thus, buttonholes with an attractive appearance can be sewn.

另外，由于切断时处于捕捉位置的底线捕捉部件33的底线导向部31a与缝纫针孔在上下方向上重合，因而能缩短从被缝制物到底线切断机构20的切断位置的路径。结果，更进一步缩短了底线切断后的自被缝制物的底线剩余长度。In addition, since the bobbin thread guide portion 31a of the bobbin thread catching member 33 at the catching position at the time of cutting overlaps with the sewing needle hole in the vertical direction, the path from the sewing object to the cutting position of the bobbin thread cutting mechanism 20 can be shortened. As a result, the remaining length of the bobbin thread from the object to be sewn after the bobbin thread is cut is further shortened.

而且，由于线拉杆4和底线捕捉部件33由凸轮部30b、30c、40c、40d连接，通过线拉杆4的驱动使凸轮部30b、30c、40c、40d的连接状态发生变化，驱动底线捕捉部件33使其移动到待机位置或作用位置，因而驱动线拉杆4的驱动源和驱动底线捕捉部件33的驱动源可用同一驱动源，能使这种机构的结构紧凑。Moreover, since the thread stay 4 and the lower thread catching member 33 are connected by the cam portions 30b, 30c, 40c, 40d, the connection state of the cam portions 30b, 30c, 40c, 40d is changed by driving the thread stay 4, and the lower thread catching member 33 is driven. It is moved to the standby position or the action position, thus the driving source for driving the wire pull rod 4 and the driving source for driving the bottom thread catcher 33 can be the same driving source, and the structure of this mechanism can be made compact.

另外，由于凸轮部30b、30c、40c、40d具有在线拉杆4的给定移动范围内不把运动传递给底线捕捉部件33的形状，在线拉杆4驱动过程中，断开该线拉杆4的驱动，使底线捕捉部件33停止在作用位置，所以，在把底线捕捉部件33定位在作用位置之后也可通过线拉杆4拽拉底线。此外，也能独立地设定线拉杆4的驱动量及底线捕捉部件33的驱动量。In addition, since the cam portions 30b, 30c, 40c, 40d have shapes that do not transmit motion to the lower thread catching part 33 within a given moving range of the thread rod 4, during driving of the thread rod 4, the drive of the thread rod 4 is disconnected, Since the lower thread catching member 33 is stopped at the active position, the lower thread can also be pulled by the thread pull lever 4 after the lower thread catching member 33 is positioned at the active position. In addition, the driving amount of the thread lever 4 and the driving amount of the bobbin thread catching member 33 can also be independently set.

另外，在上述第一实施例中，虽然能将底线导向部31a设定成在切断底线时与针孔15a在上下方向重合，但是，如果在切断底线时，与在待机位置通过底线捕捉部件33捕捉底线的状态相比，是在能缩短从被缝制物到底线切断机构20的底线切断位置的路径的作用位置，则其它位置也是可行的。换句话说，如果是在切断底线时，让底线捕捉部件33以能使图5所示的角度α小于图11所示的角度β的方式移动的情况，则其他情况也是可行的。In addition, in the above-mentioned first embodiment, although the lower thread guide 31a can be set so as to overlap with the needle hole 15a in the vertical direction when the lower thread is cut, if the lower thread is cut and the lower thread catcher 33 passes through the lower thread at the standby position Compared with the state of catching the bobbin thread, it is at an action position that can shorten the path from the sewn object to the bobbin thread cutting position of the bobbin thread cutting mechanism 20, and other positions are also possible. In other words, when the lower thread is cut, the lower thread catching member 33 is moved such that the angle α shown in FIG. 5 is smaller than the angle β shown in FIG. 11 , other cases are also possible.

此外，虽然采用了底线捕捉部件33的转动与线拉杆4的转动联动的结构，但是，可以理解，底线捕捉部件33的转动与线拉杆4的转动联动的结构并不是必须的，让底线捕捉部件33的转动独立地进行动作也是可行的。In addition, although the structure in which the rotation of the lower thread catching part 33 is linked with the rotation of the thread pull rod 4 is adopted, it can be understood that the structure in which the rotation of the lower thread catching part 33 is linked with the rotation of the thread pull rod 4 is not necessary. It is also feasible that the rotation of 33 acts independently.

再者，采用了让底线捕捉部件33转动的结构，但是，例如底线捕捉部件33沿直线移动也是可行的。In addition, although the structure which rotates the bobbin thread catching member 33 is employ|adopted, it is also possible to move the bobbin thread catching member 33 linearly, for example.

另外，通过剪刀打开机构10给底线上切刀2的被动部2e施力，使底线上切刀2相对于底线下切刀1和压线弹簧3沿顺时针方向转动，拉开切断部2c和切断部1c及压线部3c的间隔，由此，可立即开始后续的缝制，缝制开始时通过预先保持底线使缝制的开始平稳地进行。In addition, the passive part 2e of the lower thread cutter 2 is applied by the scissors opening mechanism 10, so that the lower thread cutter 2 rotates clockwise relative to the lower thread cutter 1 and the thread pressure spring 3, and the cutting part 2c is pulled apart and cuts off. Therefore, the subsequent sewing can be started immediately, and the sewing can be started smoothly by holding the bottom thread in advance at the beginning of sewing.

第二实施例second embodiment

以下，根据图5至图7说明本发明的第二实施例。在第二实旋例中与第一实施例相同的构成要素用同一符合表示。Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. 5 to 7 . In the second embodiment, the same components as those in the first embodiment are denoted by the same symbols.

本发明第二实施例的缝纫机底线切断装置通过对第一实施例的凸轮机构进行改变而设置连杆机构，可使底线捕捉部件的动作与线拉杆的动作联动。The sewing machine bobbin thread cutting device according to the second embodiment of the present invention is provided with a link mechanism by changing the cam mechanism of the first embodiment, so that the action of the bobbin thread catching part can be linked with the action of the thread puller.

首先，如图5所示，底线拉杆400的本体440和第一实施例的底线拉杆4的本体40的不同在于不形成凸轮部40c、40d。First, as shown in FIG. 5 , the difference between the body 440 of the lower thread puller 400 and the body 40 of the lower thread puller 4 of the first embodiment is that the cam portions 40c, 40d are not formed.

摆动部件7在轴50b处靠近轴5b的尖端侧与连杆50的一端可转动地连接着。另外，在连杆50的另一端形成有长孔部50a，底线捕捉板31的台阶螺钉31b的台阶部31d可在长孔部50a内移动。The swing member 7 is rotatably connected to one end of the link 50 at the shaft 50b near the tip end side of the shaft 5b. In addition, an elongated hole portion 50a is formed at the other end of the link 50, and the stepped portion 31d of the stepped screw 31b of the lower thread catching plate 31 is movable in the elongated hole portion 50a.

缝制中，摆动部件7沿反时针方向摆动，向图的下方牵拉连杆50，从而，底线捕捉板31的台阶部31d与连杆50的长孔部50a的连杆端部一侧接触，限制底线捕捉部件33向顺时针方向的转动，使底线捕捉板30处在离开针孔15a的状态(图5)。During sewing, the swing member 7 swings in the counterclockwise direction and pulls the link 50 downward in the drawing, so that the stepped portion 31d of the lower thread catching plate 31 comes into contact with the link end side of the long hole 50a of the link 50. , the rotation of the lower thread catching member 33 in the clockwise direction is restricted, so that the lower thread catching plate 30 is in a state away from the needle hole 15a ( FIG. 5 ).

切断底线时，如图6所示，摆动部件7沿顺时针方向摆动，底线拉杆400进行和第一实施例中的底线拉杆4同样的动作，同时底线切断机构20也进行和第一实施例同样的动作。When cutting the lower thread, as shown in Figure 6, the swing member 7 swings clockwise, the lower thread puller 400 performs the same action as the lower thread puller 4 in the first embodiment, and the lower thread cutting mechanism 20 also performs the same action as the first embodiment. Actions.

与此同时，连杆50向图的上方运动，台阶部31d受长孔部50a的限制被释放。从而，底线捕捉部件33在拉伸弹簧32的弹力作用下顺时针方向转动，这种转动在底线捕捉部件33的保持板30的凸轮部30b与止挡销55的接触期间受到限制。通过这种动作，底线捕捉部件33移动到作用位置。这时的底线捕捉板31的底线导向部31a设定在大体处于针孔15a中心的正下方位置。At the same time, the connecting rod 50 moves upward in the figure, and the restriction of the step portion 31d by the elongated hole portion 50a is released. Thus, the lower thread catching member 33 rotates clockwise under the elastic force of the tension spring 32 , and this rotation is restricted during the contact between the cam portion 30 b of the holding plate 30 of the lower thread catching member 33 and the stopper pin 55 . Through this action, the lower thread catching member 33 moves to the active position. At this time, the lower thread guide portion 31a of the lower thread catching plate 31 is set at a position substantially directly below the center of the needle hole 15a.

相反，缝制时，如图5所示，通过摆动部件7沿反时针方向的摆动，底线拉杆400进行和第一实施例的底线拉杆4同样的动作，同时底线切断机构20也进行和第一实施例一样的动作。On the contrary, during sewing, as shown in FIG. 5 , by swinging the swing member 7 in the counterclockwise direction, the bobbin thread puller 400 performs the same action as the bobbin thread puller 4 of the first embodiment, and the bobbin thread cutting mechanism 20 also performs the same action as the first embodiment. The same operation as in the embodiment.

与此同时，连杆50向图中的下方移动，台阶部31d由长孔部50a限制，底线捕捉部件33克服拉伸弹簧32的弹力，沿反时针方向转动。由此，底线捕捉部件33向底线捕捉部件33的底线捕捉板31不妨碍针动作的待机位置移动。At the same time, the connecting rod 50 moves downward in the figure, the stepped portion 31d is restricted by the elongated hole portion 50a, and the lower thread catching member 33 overcomes the elastic force of the tension spring 32 and rotates counterclockwise. As a result, the lower thread catching member 33 moves to the standby position where the lower thread catching plate 31 of the lower thread catching member 33 does not interfere with the movement of the needle.

这样，根据本发明的第二实施例，配备通过操作而摆动的摆动部件7，同时，线拉杆400及底线捕捉部件33通过连杆5、连杆50与摆动部件7连接，通过摆动部件7的驱动，可驱动线拉杆400及底线捕捉部件33。因而，驱动线拉杆400的驱动源与驱动底线捕捉部件33的驱动源可以共用。In this way, according to the second embodiment of the present invention, the swinging member 7 that swings through operation is equipped. At the same time, the thread pull rod 400 and the lower thread catching member 33 are connected to the swinging member 7 through the connecting rod 5 and the connecting rod 50. Driven to drive the thread lever 400 and the lower thread catcher 33 . Therefore, the driving source for driving the wire stay 400 and the driving source for driving the lower thread catching member 33 can be shared.

Claims (5)

1. the device for cutting lower thread of a Sewing machines has:
With the bottom line to peg or spindle engages from sewn object, on the direction of intersecting with bottom line, pull bottom line by formed pin hole on the Sewing machines needle plate, extract the line pull bar of the bottom line of specified rate from peg or spindle out;
Be configured in needle plate below, the bottom line of above-mentioned line pull bar being extracted out by thread cutting action is characterized in that at the bottom line shut-off mechanism that pin hole nearby cuts off, also comprises:
Be configured between needle plate and the bottom line shut-off mechanism at above-below direction, can catch parts at the bottom line that is positioned at the active position below the pin hole and do not hinder the position of readiness that leaves pin hole of pin action to move;
Make bottom line catch parts and when seam is put, be in position of readiness, make the back and before the bottom line shut-off mechanism cuts off the bottom line action, move to the bottom line seizure parts travel mechanism of active position from position of readiness.
2. the device for cutting lower thread of Sewing machines according to claim 1 is characterized in that, when position of readiness moved to active position, above-mentioned bottom line was caught parts and caught bottom line by pin hole, and it is directed into below the pin hole.
3. the device for cutting lower thread of Sewing machines according to claim 1 is characterized in that, changes the bottom line path when above-mentioned position of readiness moves to active position, so that shorten from the sewn object path of the bottom line off-position of line cut-off machine structure on earth.
4. the device for cutting lower thread of Sewing machines according to claim 1, it is characterized in that, above-mentioned line pull bar and above-mentioned bottom line are caught parts and are engaged by cam part, change the fastening state of above-mentioned cam part by the driving of above-mentioned line pull bar, drive above-mentioned bottom line and catch parts.
5. the device for cutting lower thread of Sewing machines according to claim 1, it is characterized in that, also comprise the tilting member that drives by operation, above-mentioned line pull bar and bottom line are caught parts and are connected with above-mentioned tilting member by connecting rod, by the driving of above-mentioned tilting member, drive above-mentioned line pull bar and bottom line and catch parts.
CN 00104736 1999-03-24 2000-03-24 Device for cutting lower thread of sewing machine Expired - Lifetime CN1131905C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP08009399A JP4245222B2 (en) 1999-03-24 1999-03-24 Lower thread cutting device of sewing machine
JP80093/1999 1999-03-24
JP80093/99 1999-03-24

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CN1268594A true CN1268594A (en) 2000-10-04
CN1131905C CN1131905C (en) 2003-12-24

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CN (1) CN1131905C (en)
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TW (1) TW470799B (en)

Cited By (9)

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Publication number Priority date Publication date Assignee Title
CN100365188C (en) * 2001-07-26 2008-01-30 杜尔克普-阿德勒股份公司 Sewing machine, especially buttonhole-lockstitching sewing machine, with string fastening and cutting device
CN100366812C (en) * 2001-11-19 2008-02-06 重机公司 Buttonhole Sewing Machine
CN100447327C (en) * 2000-12-07 2008-12-31 重机公司 Thread cutting device
CN101845725A (en) * 2009-03-27 2010-09-29 兄弟工业株式会社 sewing machine
CN1676722B (en) * 2004-04-01 2011-07-13 杜尔克普-阿德勒股份公司 Sewing machine
CN101397730B (en) * 2007-09-28 2012-05-30 高林股份有限公司 Lower thread cutting device of sewing machine
CN101709537B (en) * 2009-11-03 2012-07-25 西安标准工业股份有限公司 Line cutting structure for sewing machines
CN101353850B (en) * 2007-07-25 2013-01-23 Juki株式会社 sewing machine
CN107938192A (en) * 2017-12-26 2018-04-20 方琳 Cut the control method of bottom line device, sewing machine and sewing machine

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JP6581853B2 (en) 2015-09-07 2019-09-25 Juki株式会社 Hole sewing machine

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DE3715603C1 (en) * 1987-05-09 1988-06-23 Pfaff Ind Masch Thread cutting device for zigzag sewing machines
JPH0759266B2 (en) * 1990-10-30 1995-06-28 ジューキ株式会社 Bobbin thread cutting device for sewing machine

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100447327C (en) * 2000-12-07 2008-12-31 重机公司 Thread cutting device
CN100365188C (en) * 2001-07-26 2008-01-30 杜尔克普-阿德勒股份公司 Sewing machine, especially buttonhole-lockstitching sewing machine, with string fastening and cutting device
CN100366812C (en) * 2001-11-19 2008-02-06 重机公司 Buttonhole Sewing Machine
CN1676722B (en) * 2004-04-01 2011-07-13 杜尔克普-阿德勒股份公司 Sewing machine
CN101353850B (en) * 2007-07-25 2013-01-23 Juki株式会社 sewing machine
CN101397730B (en) * 2007-09-28 2012-05-30 高林股份有限公司 Lower thread cutting device of sewing machine
CN101845725A (en) * 2009-03-27 2010-09-29 兄弟工业株式会社 sewing machine
CN101845725B (en) * 2009-03-27 2013-03-20 兄弟工业株式会社 Sewing machine
CN101709537B (en) * 2009-11-03 2012-07-25 西安标准工业股份有限公司 Line cutting structure for sewing machines
CN107938192A (en) * 2017-12-26 2018-04-20 方琳 Cut the control method of bottom line device, sewing machine and sewing machine

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Publication number Publication date
CN1131905C (en) 2003-12-24
DE10013799B4 (en) 2009-07-16
JP4245222B2 (en) 2009-03-25
DE10013799A1 (en) 2000-12-21
TW470799B (en) 2002-01-01
JP2000271371A (en) 2000-10-03

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