TW470799B - Apparatus for cutting bobbin thread in sewing machine - Google Patents

Abstract

To provide an apparatus for cutting a bobbin thread in a sewing machine capable of decreasing the remaining length of bobbin thread of a sewing product. An apparatus for cutting a bobbin thread in a sewing machine comprises a reeling-in-thread lever 4 engaging with the bobbin thread extended from a sewing product to a bobbin via a needle hole 15a formed in the throat plate 15 of the sewing machine and reeling in the bobbin thread so as to draw out a predetermine quantity of bobbin thread from the bobbin, and bobbin thread cutting means 20 for cutting the bobbin thread drawn out by the reeling-in-thread lever 4 in the vicinity of the sewing product. The apparatus for cutting the bobbin thread also includes a bobbin thread capture member 33 for guiding the route of the bobbin thread seized and held and reeled in by the reeling-in-thread lever 4 to ensure that the bobbin thread is cut off by the bobbin thread cutting means 20. The bobbin thread capture member 33 is moved to a standby position so as to prevent the bobbin thread capture member 33 from interfering with the operation of a needle during sewing operation. Further, the bobbin thread capture member 33 is moved to a position at the time the capture member is cut with a route from the sewing product up to a position where the bobbin thread is cut by the bobbin thread cutting means 20 becomes shorter than that in the condition of seizing and holding the bobbin thread by the bobbin thread cutting means 20 in the standby position.

Description

A7 B7 V. Description of the invention (Smartman [Technical field to which the invention belongs] The present invention relates to a cutting device for cutting off a thread at the beginning of a sewing machine such as a buttonhole machine for sewing a buttonhole. [Known Technology] About Buttonhole Sewing Machines The known lower thread cutting device of this kind of sewing machine is known, for example, as described in Japanese Patent Publication No. 7-59266. The conventional one will be described with reference to Figures 8 to 1 丨. Needle plate table 8 series fixed The needle plate 15 is supported by a sewing machine table (not shown), and the needle plate 15 is fixed to the needle plate table 8. The needle plate table 8 forms a cutout 8b, and becomes the operating area of the lower thread cutting device 20. The needle plate 15 is provided in an elongated shape. The needle eye 15 is pressed and the long cutting knife orthogonal to the long side of the eye 15a is inserted into the hole ⑽. The stitch (not shown) swings within the long side of the eye 15a. At the same time, its swing position penetrates the eye 15a and can be moved up and down. The lower thread rewinding lever 14 is located below the needle plate table 8. Among them, the support shaft 140a is rotatably supported in the middle of the machine frame. The lower thread rewinding lever 14 is a rewinding plate. The lower thread reel is tied to a series of sewing knots. After the bundling, a certain amount of lower thread is pulled out from the shuttle during the next sewing, and the lower thread catching plate 131 is lowered by the lower thread catching plate 41 of the lower thread lowering lever 140, and the lower thread is cut off by the lower thread. Reliable cutting. The lower-line cutting device 20 is composed of the upper-lower and upper-lower cutting of the upper and lower knives], the lower-knife and 2 I-line springs. The rotating branch is on the needle board table 8. The cut off lines are facing the cut paper. The size of the paper applies to the Chinese National Standard (CNS) A4 (210 X 297 male i "

(Please read the precautions on the back before filling out this page) Μ, ------- Order --------- 0 -4 470799 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs DESCRIPTION OF THE INVENTION (2 Lower thread lower knife 1 pushes the pivotable support of shaft 2a to the center. Furthermore, the lower heald lower knife 1 and the rewinding lever 4 are connected to the shafts 6a and 6b. Among them, the two ends facing each other can be rotated. A fixed pin lb is formed on the cutting-off lower thread m, and it belongs to 3 pairs of the cutting-off lower thread edge 1. The fixing pin lb penetrates through the long hole 2b formed on the cutting-off thread 2 of the cutting-off thread. The top end protrudes above the cutting lower wire edge 2. Furthermore, the repeated spring 3 system shaft 2a is installed on the cutting lower wire edge 1 while the pressure spring 3 is fixed to the lower wire lower edge by the fixing pin lb. i position. Therefore, the cutting-off upper-line knife 2 can be rotated while holding the cutting-off lower-line knife 1 and the wire spring 3. However, the cutting-off upper-line knife 2 is centered on the shaft 2a toward the direction of FIG. 8 When rotating in the clockwise direction, the cutting portion ^ formed at the end of the cutting edge 2 and the cutting edge ^ formed at the cutting edge of the lower line are separated from the cutting portion lc at the end. At the same time, the cutting portion 2c and the cutting portion 2c are formed. The wire clamping part ~ at the end of the pressure spring 3 is separated from each other. Furthermore, since the cutting lower thread 2 is turned counterclockwise, the cutting part ^ and the cutting part 2c can be cut with a pliers closing interval. Cut off the thread. In addition, when the cutting part lc and the cutting part are "closed, the cutting part is cut at the same time. The distance from the thread clamping part 3c is closed. From this, it becomes better to hold the lower line than to the position of the pliers. The shuttle can keep the lower side of the thread. The cutting edge 2 is provided with a potential energy portion to protrude in the clockwise direction of the cutting edge 2 and is opposed to the potential energy portion 2e and the brake h protruding from the needle plate. Stage 8. When the interval between the cutting part lc that cuts the lower line and the lower edge 丨 and the cutting part 2c that cuts the lower line 2 is open, when the lower line cutting device is rotated clockwise, it is given the potential energy part 2e. Connected to the brake _ 8 ^ -------- t · -------- (Please read the precautions on the back before filling in this page)

470799 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 ---- ~ --- Έ .____ V. Description of the invention (3) Figure 9) When the lower-line cutting device 20 is further rotated after the top connection, The lower thread cutter 2 is fitted in the stopper 8a and is rotated counterclockwise. As a result, the cutting portion 1C and the cutting portion are closed. The state of cutting off the thread is set under the needle eye 5a by the cutting positions of the cutting parts 1c and 2C. In addition, the cutting line 2 of the lower cutting line is provided with a potential pin 2d. In addition, the slightly potential-shaped element imparting potential energy member 11 and the shaft 11a are rotatably supported on the needle plate table 8 as a center, and are rotatably connected to one end of the link 12 of the shaft 11b. When the connecting rod 12 moves to the right in FIG. 8, the potential-energy-imparting member 11 is stretched by the connecting rod 12 to rotate counterclockwise. Then, the fitting portion 11 c of the potential imparting member 丨 丨 pushes the potential potential pin% of the cutting-off upper edge 2, and the cutting-off upper edge 2 is opposite to the cutting-off lower edge 丨 and the crimping spring 3. Turn clockwise to open the gap between the cutting part 1 c and the cutting part 2C. The potential energy pins 2 (1, the potential energy component 11, and the connecting rod 12 constitute the sweet-type opening mechanism) are formed by the cutting of the lower edge 2 of the cutting line. The conventional structure is as follows, in the sewing process, it is the 8th. As shown in the figure, the cutting off the lower cutting edge 1 and the cutting off the upper cutting edge 2 are turned on by the sweet-type opening mechanism 10. The cutting off the lower cutting edge is linked to the lower thread cutting rod 140 through the link 6 in a clockwise direction. When turning in the direction, the cut-off upper cutting edge 2 and the pressure spring 3 connecting the cut-off lower cutting edge 丨 move toward the long side of the needle eye 15a, and cooperate with the top end of the thread-removing plate 41 of the thread-return lever 140 to become the needle-eye 15 & The state where the lower thread is caught near to the lower thread is cut. This state consists of the cutting part which cuts the lower thread and the lower edge 丨. There is an lower thread between the pliers formed by the cutting part 2c which cuts the lower thread and the upper edge 2. After the sewing is finished The needle is stopped at the upper position relative to a certain position in the long side of the needle eye [5a], and the lower thread becomes from the cloth through the needle eye 15a to the shuttle. The paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm 7

— II III I--It · —-- I ---- line (please read the notes on the back before filling this page) 470799 A7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs At this time, the lever 5 moves toward the top of FIG. 8 by the operation of the pedal, and the rewinding lever 140 rotates counterclockwise, and a certain amount of the lower thread rewinding board 41 is required by the shuttle (Figure (The illustration is omitted), and the lower end is tensioned to the lower thread tension part 下 of the lower thread catching plate 131. (Fig. 9). The rewinding plate 41 moves in a counterclockwise direction to pull the lower thread from the shuttle, -aspect ' The lower thread cutting device 20 rotates in a clockwise direction. Further, a potential energy portion is formed at the 2-side end of the lower thread cutting edge. The stopper portion 8a abuts on the needle plate table & then, as shown in FIG. Cutting off the lower line and the lower blade i further rotates in a half-clockwise direction, cutting off the cutting portion of the lower line 2 with the cutting portion lc of the lower line 1 and closing the lower line, while keeping the end of the lower line at the press line The spring 3 and the cutting lower wire edge 2. Then, the link 5 is moved to the standby position as shown in FIG. 8 to become The standby state of the next cycle. [Problems to be solved by the invention] However, the above-mentioned conventional lower thread cutting device is fixed to the needle plate table 8 as the lower thread catching plate 丨 3, so that the lower thread catching plate 131 does not hinder the movement of the needle during sewing. As shown in FIG. 11, it is necessary to place the lower thread catching plate 131 at a position staggered by a certain distance or more from the needle eye 15 a of the needle plate 15. Therefore, the length from the sewing of the lower thread to the cutting end, that is, The remaining length of the lower thread becomes longer, and there is a problem that the so-called appearance becomes very poor. Therefore, the object of the present invention is to provide a lower thread cutting device for a sewing machine that can shorten the remaining length of the lower thread of a sewing object. The invention of item 1 of the scope of patent application that solves the above problems is the lower thread cutting device of the sewing machine, which includes: This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) 7 I--1-- ----- Install------- Order --------- (Please read the precautions on the back before filling this page) 470799 A7 B7 V. Description of the invention (Inverted rod, system Self-stitching through the eye of the needle formed on the seam_needle plate The lower thread is pulled towards the cross-cutting side and the peak is near the lower thread, and a certain amount of the lower thread is pulled from the shuttle; and the lower thread cutting device is used to cut off near the eye of the needle by the thread-breaking action arranged under the needle plate, which is pulled by the aforementioned rewind lever The lower thread is taken out and includes: the lower thread capture member, which is arranged in the up-down direction, which is arranged between the needle plate and the lower thread 2 and is placed between the position of the needle eye τ and the standby position that does not prevent the needle from separating from the needle eye. Moving; and ordering the lower thread catching member moving device, which places the lower thread catching member in a standby position during sewing ', and moves from the standby position to the active position after sewing before the thread cutting operation of the lower thread cutting device. According to the scope of patent application! According to the invention, since the lower thread catching member is moved to the standby position by the lower thread catching member moving device during sewing, the lower thread catching member does not hinder the movement of the needle. Furthermore, when the lower thread is cut off, the lower thread catching member is moved and placed. Since the lower thread catching member is placed under the action position of the needle eye, the remaining length of the lower thread of the sewing object after the τ thread is cut can be shortened. The invention of item 2 of the patent application scope printed by the Employees' Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs is the offline cutting device under the patent application scope. Among them, when moving from the standby position to the active position, the aforementioned offline capture member The needle thread captures the lower thread tension under the needle eye. According to the invention of claim 2 in the scope of the patent application, since the lower thread capture member captures the thread under the needle eye to the needle eye, the path from the sewing object to the cutting position of the lower thread cutting device can be shortened even more. Therefore, it can be more

This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 male 1) V. Description of the invention (6) Shorten the remaining length of the lower line of the sewing product after the lower line is cut. The invention in the third scope of the patent application is the first thread cutting device of the sewing and cutting machine under the first scope of the patent application. When moving from the standby position to the active position, the lower thread cutting device is used to make the sewing from the sewing object to the lower thread. The path of the breaking device is shortened and the path of offline is changed. According to the invention in item 3 of the scope of patent application, when moving from the aforementioned standby position to the active position, the path from the sewing product to the lower thread cutting position is shortened by the lower thread cutting device, and the lower thread grip is changed. It can shorten the path from the sewing object to the cutting position even more. Therefore, the remaining length of the lower thread of the sewing object after the lower thread is cut can be further shortened. The invention in item 4 of the scope of patent application is a thread cutting device under the sewing machine in item i of the scope of patent application, wherein the aforementioned rewinding lever and the aforementioned lowering catching member are driven by the cam, and by the driving of the aforementioned rewinding lever, When the fitting state of the cam portion is changed, the lower-line capture member is driven. According to the invention in item 4 of the scope of the patent application, the rewinding lever and the lower thread catching member are fitted through the cam portion. Due to the swollen state that is changed by the drive of the rewinding lever, the lower thread catching member is driven. The dynamic source can be shared with the source that is the driver, and the mechanism can be miniaturized. ^ The invention of item 5 in the scope of the patent application is an offline thread cutting device under the application of special equipment. Its _, Minle seam includes a swing member driven by operation, and the aforementioned down, wire rod and the aforementioned offline capture member system. The link is connected to the swing member, and the rewind lever and the lower thread catching member are driven by driving the swing member. b Ί The paper size is applicable to China National Standard (CNS) A4 specifications (210 X Guan Gongfa) — / Wide-area -------- Order -------- Line f Please read the note on the back first (Fill in this page again) 9

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A7 printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs No. -----___ V. Description of the invention (8) Inverted cup 4 series cam part 40 (and continuous formation of the cam part 40d. The rewind lever 4 When turning counterclockwise, the fitting part of the top of the reverse thread correction ... fits through the needle eye 15a to the thread from the sewing object to the spool (not shown), and a certain amount of the lower thread can be pulled out from the shuttle. According to the tension spring 32 installed at the base end of the holding plate 30, the lower thread catching member 33 is rotated clockwise. The lower thread catching plate 31 is formed as the lower thread catches the lower thread and tensions the lower thread. The middle part of the V-shape is thinner and the lower thread tensioning portion 3 la. The holding plate 30 is provided with a cam portion 3 {) c, which is projected above and formed on the protruding portion 3GA and can be fitted to the aforementioned cam portion operation; and the cam portion The dove is formed on the eight sides of the protruding portion 30 and the cam portion 40c can be fitted. The cam portions 40c and 40d, the cam portions 30c and 30d, and the tension spring 32 constitute the lower-line capture member moving device. When the lower-line capture member 33 rotates clockwise, the movement of the holding plate 30 is restricted when the cam portion 30c abuts the cam portion 40d (Figs. 2 and 3), and the rotation of the lower-line capture member 33 stops. The position of the lower thread catching member 33 when the “off thread catching member” is stopped is the active position. Moreover, the lower thread tensioning portion 3 1 a is the active position, in other words, the lower thread catching portion of the lower thread catching member 33 overlaps with the needle eye 15a in the up-down direction. In addition, this action position is ideal when the lower thread tensioning portion 31a is placed substantially directly below the center of the needle eye 15a. Furthermore, when the rewind lever 4 is rotated clockwise, the cam portion 40c abuts on the cam Part 30b, cam part 40c—while sliding slightly on the cam part 30b—while pushing, the lower-line capture member 33 is rotated counterclockwise. This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 (Mm) t -------- Order --------- Complete (please read the notes on the back before filling this page) 11 47079 Printed by A7, Consumer Cooperatives, Intellectual Property Bureau, Ministry of Economic Affairs Explanation of the invention (9) The operation of the offline device of the sewing machine thus constituted is described below. During sewing, as shown in Fig. 1, the state is pulled clockwise by the link 5. At this time, the follower 4 is followed The action becomes offline through the link 6 In the state where the breaking device 20 is rotated counterclockwise, the cutting portion lc of the lower line lower knife i and the cutting portion 2c of the lower line knife 2 are separated from the needle eye 15 & respectively. The opening mechanism 10 becomes a cut-off portion, and is in a state of being mutually opened. Furthermore, the cam portion 40c of the lower thread guard 4 is fitted into the cam portion 30b of the lower thread catching member 33 to resist the tensile force of the tension spring 32. The lower thread catching member 33 is rotated in the counterclockwise direction. That is, the lower thread catching member μ is a standby position that does not prevent the lower thread catching plate 31 from moving through the needle 15a. After the sewing operation is completed, it becomes the needle eye 5a. The state where the needle is stopped at any position in the long-side direction range. In this state, the lower thread is cut off = the aforementioned driving device, such as the operation of the pedal, is used to swing the swinging member 7 clockwise, and the rewinding rod is passed through the link 5. 4 Rotate counterclockwise. At this time, the following actions ① ~ ③ occur simultaneously. ① The fitting part 41a of the rewinding plate 41 of the rewinding lever 4 is fitted to the lower thread, pulling the thread from the needle to the lower thread of the shuttle. Nearly cross the offline path In the direction, the shuttle only releases a certain amount of lower thread required for the next sewing. Here, after pulling the lower thread, the lower thread can be reliably captured by the pliers. The direction of the lower thread by the rewind lever 4 is roughly the same as the needle eye. 15 & The long side direction is the same. 〇 The rewind lever 4 is rotated counterclockwise, and the restriction of the cam portion of the holding plate 30 from the cam portion 40c of the rewind lever 4 is lifted. Because the offline capture member 33 is borrowed from this paper Standards apply to China National Standard (CNS) A4 (210 X 297 mm)

-Install -------- Order ---------- .. C Please read the notes on the back before filling in this page} 12 47u / ya A7 V. Description of the invention (10) Stretch The spring 32 is caused to follow the movement of the cam portion 40C in the clockwise direction, and the cam 430b system is rotated clockwise in the capture member 33 system with the tensile force of the tension spring 32. -凸轮 The cam part 3Ge of the holding plate 3G abuts the cam part of the lower lever 4 and the clockwise rotation of the lower thread catching member 33 stops. That is, the 'line capture member 33 is arranged at the action position. At this time, as shown in FIG. 4, the position of the lower thread catching plate 3! And the lower thread tensioning portion ... is related to the eye of the needle ... the upper-lower direction is -middle and mouth 'and the lower thread tensioning portion 31a is located directly below the approximate center of the eye of the needle ... ... In the turning operation of the offline capture member 33, when the offline tension part 3u Xiancang offline is set to the standby position, the path becomes offline as shown in Fig. 4. That is, "the lower thread guides the lower thread so that it hangs substantially from the object to be sewn." Furthermore, if one of the cam portions 40c and 40d of the rewind lever 4 or the cam portion 30b of the lower thread catching member 33 or the other shape is changed, the upper thread catching operation of the lower thread catching member 33 is completed, and the lower thread The tension section 31 & captures the offline can also be easily changed to change the route of the offline. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. When the offline route is changed, the offline tension section 31a is pressed in the opposite direction of the movement direction of the offline capture plate 31, even if the position of the moment of offline is captured from the offline tension section 31a. By staggering a little, the lower thread system along the middle tapered shape induces the lower thread tension portion 31 a ′. This branch can correct or guide the path of the lower thread. In addition, the cam portion 30c of the holding plate 30 is abutted against the cam portion 40d of the lower lever 4 and the rotation of the lower thread catching member 33 is stopped. Then, when the down-line capture member 33 is disposed at the active position, the driving of the down bar 4 and the lower paper size are in accordance with the Chinese National Standard (CNS) A4 (210 X 297 mm). 5. Description of the invention (11) Line Driving of the capture member 33. Moreover, only the rewinding lever 4 still rotates a fixed amount, and a certain amount can be pulled out from the shuttle. In other words, the cam part bird, 30. Among them, the moving range defined by the reel 4 is a shape that does not convey movement to the lower-line capture member 33. ③ Furthermore, it does not rotate counterclockwise with the rewinding lever 4, and the lower thread cutting device is through the connection; ^ 6 rotates clockwise. Moreover, the cutting section 2 and the thread clamping section 3c catch the lower thread at the position of the shuttle rather than the pliers. Shortly after being applied to the potential energy unit 2e, the brake was connected to the brake 8a, and the potential energy was added to the warp, and the potential energy was moved to the brake 83. Turning in the clockwise direction keeps the thread off by closing the gap between the cutting section & the thread tightening section 氕. At the same time, the interval between the cutting portion 1c and the cutting portion 2c is closed. Here, the cutting part is closed and the cutting part is cut off the line because the cutting part u and the cutting part are used to set the cutting position. The needle eye 15a and the vertical direction are mutually heavy. ; Directly below can cut off the line. 4 The state at the time of cutting is shown in FIG. 4, and the lower thread tensioning portion 31 & is located directly below the approximate center of the needle eye 15a, like the lower thread at the time of tensioning and cutting. Furthermore, at the same time as cutting off the lower thread, since the lower end of the lower thread holds the wire spring 3 and the lower thread cutter 2 at the position of the shuttle rather than the cutting part, the rewinding lever 4 has a sufficient length to be pulled in. When the shuttle is pulled out, the lower thread becomes the standby state for the next sewing. Here, in order to make the action of the cutting part 2c, the cutting part 1c, and the cutting part 2 (; and the thread clamping part 3c substantially coincide with the long side direction of the needle eye 15a, regardless of :;-; 3 ::; -; 3

-I I I I I 1 I I I I I I I I. (Please read the note on the back? Matters before filling out this page)

A7 Β7 V. Description of the invention (丨 2) When the needle is stopped at the end of sewing, it is often cut and held at any point of the lower thread cutting device 20, and it can capture the lower thread. In this way, the lower thread tensioning portion 3 1 a becomes a state in which the lower thread capture member 33 is disposed at the position where the needle eye 15 a is approximately under the center. Since the lower thread tensioning portion 3 1 a tensions the lower thread and cuts the lower thread, there is a minimum It shortens the path from the sewing object to the lower thread cutting position of the lower thread cutting device 20. That is, the path from the sewing object to the lower thread cutting device 20 lower thread cutting position is changed by the position where the needle is stopped after the sewing is completed, but the lower thread tensioning portion 31 a becomes directly below the center of the needle eye 15 a. In this state, the remaining length of the lower thread can be made approximately the same when the position of the needle is on one side of the long side of the eye 15a and on the opposite side. Therefore, as in the case where the lower thread tension portion 3a is not opposed to the needle eye 15a, there is no problem that the remaining length of the lower thread becomes extremely long when the stop position of the needle is on one side of the long side of the needle eye 15a. Moreover, as long as the stop position of the needle is often made at the center of the long side of the eye 15a, the remaining length of the lower thread of the material to be sewn can often be made the shortest second. To start the next sewing operation, the swinging member is driven by the driving device. 7 Swing in the counterclockwise direction, and rotate the rewinding lever in the clockwise direction through the link 5. At this time, the actions ① and ② shown below occur simultaneously. ① Through the counterclockwise rotation of the connecting rod 6 and the lower thread cutting device 20, the pliers are disengaged from the eye 15a. ② Without Ik turning the needle cup to rotate in the direction of the needle, borrow the cam part of the needle lever 4 * 〇. The dome of the cam portion of the holding plate 30 imparts the potential energy of turning counterclockwise

The size of this paper is the national standard of China (297 mm) 15 470793 A7 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs

Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs

V. Description of the invention (M) Moreover, the rewind lever 4 and the lower-line capture member 33 are connected through the cam portions 30b, 30c, 40c, and 40d. The cam portions 30b, 30c, and In the connection state of 40c and 40d, the offline capture member is driven to a standby position or an active position. The driving source for driving the rewind lever 4 and the driving source for driving the offline capture member 33 can be used in common. At the same time, these mechanisms can be small In addition, the cam portions 30b, 30c, 40c, and 40d have a certain range of movement of the lower lever 4 in which the motion is not transmitted to the lower thread catching member 33. Since the driving of the lower lever 4 separates the lower thread catching member 33, After stopping at the action position, after the lower thread capture member 33 is positioned at the effective position, the lower thread can also be pulled down by the rewind lever 4. Furthermore, the driving amount of the lower thread lever 4 and the drive amount of the lower thread capture member 33 can be independently set in part. In addition, 'the first embodiment of the embodiment described above, although the lower thread tension portion 31a is set to overlap with the needle eye 15a in the vertical direction when the lower thread is cut, but when the lower thread is cut, it is captured by the lower thread at the standby position. It is better to catch the '33 under the '33' position. As long as the path from the object to be sewn to the lower thread cutting device 20 is shortened, the other positions are also possible. In other words: 'As long as the lower thread is cut off in Figure 5 The angle α constitutes a smaller angle than the angle / 5 of the u-th figure. The movable lower-line capture member 33 can be moved, and the others are also possible. 〃 Furthermore, the rotation of the rewind lever 4 is made to interlock the lower-line capture member 33 & The constitution 'but not definite' does not have the necessity of the rotation of the lower thread catching member 33 in conjunction with the rotation of the rewind lever ^, and such independent actions are also possible. Moreover, although the constitution of the lower thread catching member 33's rotation is made, However, for example, the lower-line capture member 33 is also straight. ° Turn the paper ruler (please read the precautions on the back before filling this page). -------- Order ------ --- Line 17 V. Description of the invention (l5) In addition, 'the pliers-type opening mechanism 10 is given the potential energy lock 2d potential energy by cutting the upper edge 2 of the lower edge, and the knife on the lower line is lower than the lower line The blade 1 and the invitation thread 旋 3 are rotated clockwise to open the gap between the cutting part ㈣cutting part ^ and the thread clamping part 3c. When the primary sewing is short, the sewing at the beginning of the sewing process is performed by keeping the lower thread stable. ≪ Example of embodiment of 苐 2 implementation > The embodiment of the second embodiment of the present invention will be described below with reference to Figs. 5 to 7 In addition, the configuration example of the second embodiment is the same as that of the configuration example of the i-th embodiment with the same symbols. The second thread embodiment of the present invention is provided with a lower thread cutting device. According to the cam mechanism of the first embodiment, a link mechanism is provided to perform the movement of the offline capture member and the reel lever. First, as shown in FIG. 5, the main body 44 of the offline reel lever 400 〇 The difference between the V cams 40c and 40d and the main body 40 of the wire rewinding lever 4 under the first embodiment is different. The swinging member 7 is a shaft 50b which is connected to the end of the link 50 at the top end side of the shaft 5b. In addition, the other end of the connecting rod 50 forms a long hole portion 50 and becomes a segment portion 3d of the hinge spiral 3 lb of the lower thread catching plate 31, which is movable within the long hole portion 50a. Now, during the sewing process, the rocking member swings counterclockwise, and the connecting rod 50 is stretched to the lower direction in the figure. Therefore, the section 31d of the lower thread catching plate 31 contacts the connecting rod 5 of the long hole portion 50a of the connecting rod 50. On the end side of 〇, the rotation of the lower thread catching member 33 in the clockwise direction is restricted, and the lower thread catching plate 31 is separated from the eye 15 a (FIG. 5). 1Π739 A7 B7 V. Description of the invention (16) The off-line cut-off day guard is shown in Figure 6. 'Because the swinging member 7 swings the down lever 400 in the clockwise direction and the i-th real shape of the back-up guard 4 the same action The offline cutting device 20 also operates in the same manner as in the first embodiment. At this time, the link 50 moves to the upper direction of the figure at the same time, the section 31d has a long elasticity, and 32 imparts the potential energy of clockwise rotation. The moving part is held down by the cam part of the holding plate 30 of the lower-line capture member 33. By this action, the lower-line capture member 33 is moved to the active position. 2 = 'The lower-line tension part 3 under the capture plate 31 is set at Needle eye 1 & Approximately directly below the center. Conversely, as shown in FIG. 5 during sewing, the swinging member 7 is rotated counterclockwise, and the 'rewinding lever 400 is the same as the rewinding lever 4 of the first embodiment. At the same time, the offline cutting device 20 also operates in the same manner as the first embodiment. The same Tonglian # 50 moves to the direction below the figure, the section 31d is limited by the long hole pool, and the offline capture structure 3 resists borrowing. The tension spring 32 imparts a force of potential energy to the counterclockwise rotation. "Under the thread capture member" Bottom = The catching plate 31 and the lower thread capture member 33 are moved to standby without hindering the movement of the needle. According to the embodiment example of the second embodiment of the present invention, the swinging member 7 including the "# swing" is inverted simultaneously. The wire rod through and lower thread catching member 33 is connected to the swing member 7 through the connecting rod 5, and the link 50 is driven by the swing member 乂 to drive the rewind lever 400 and the lower thread catching member 33. Therefore, the drive The source and the driving source for driving the offline capture member 33 may be

Tattoos on this paper scale (cns) A4 secret Q

Calling -------- Order -------- (Please read the precautions on the back before filling out this page) Line 噚. 19 month instructions (17) Make a share. [Effect of the invention] According to the lower thread cutting device of the sewing machine according to the invention in the scope of patent application, the lower thread capturing member is moved to the standby position by the lower thread capturing member moving device during sewing. The lower thread capturing member does not become a needle. Obstacles to movement. Furthermore, since the lower thread catching member is moved by the lower thread catching member when the lower thread is cut, the remaining length of the lower thread of the sewing product after the lower thread is cut can be shortened by the lower thread catching member being located at the position under the eye of the needle. According to the invention in the scope of patent application No. 2, since the aforementioned lower thread catching means captures the thread under the eye of the needle to be tensioned under the eye of the needle, the path from the sewing object to the cutting position of the lower thread cutting device can be further shortened. Therefore, the remaining length of the lower thread of the sewing object after the lower thread is cut can be further shortened. According to the invention of claim 3, when moving from the standby position to the active position, the path of the lower thread # is changed from the sewing object to the lower thread cutting position of the lower thread cutting device due to the change in the configuration of the lower thread #. Therefore, the remaining length of the lower thread of the sewing object after the lower thread is cut can be further shortened. According to the invention in item 4 of the scope of the patent application, the lever and the lower-line capture member are tightly connected through the cam portion. Because the fitting state of the driving cam portion by the rewind lever changes, the lower-line capture member is driven. The drive source and the drive source for driving the offline capture member can be shared, and these mechanisms can be miniaturized. According to the invention of claim 5 in the scope of the patent application, since the swing member is driven by operation, the rewinding lever and the lower-line capture member that connect the swing member through the link will drive 'the driving source for driving the rewind lever and the application for driving the lower-line catcher. Form example Sewing machine off-line cutting device 5. Invention description (I8) The drive source can be shared. [Brief description of the drawings] [Figure 1] Shows that the present invention is related to the first! Bottom view of the state during actual sewing. [Fig. 2] A bottom view showing the state of the present invention when the cutting device is installed and the first embodiment is cut by the lower thread cutting device of a sewing machine. [Fig. 3] J is a bottom view showing a state at the end of the operation of the lower thread cutting device of the sewing machine according to the first embodiment of the present invention. [Fig. 4] It is a side cross-sectional view illustrating the vicinity of the needle eye in the state of cutting off the thread. [Fig. 5] It shows that the second Dou Bai of the present invention; flower! Can & ^, The bottom view of the sewing machine under sewing state under the embodiment of sewing. [Fig. 6] A bottom view showing a state at the end of the operation of the lower thread cutting device of the sewing machine according to the second embodiment of the present invention. [Fig. 7] An exploded perspective view showing an offline capture plate and a connecting rod. [Fig. 8] Bottom view showing the state of the sewing machine in the sewing process when the sewing machine is used to cut off the thread. The paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm). -Order --------- ^^^ 1 (Please read the notes on the back before filling out this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 21 ^ 0799 A7 B7 V. Invention Description (I9 Economy Printed by the Ministry of Intellectual Property Bureau's Consumer Cooperatives [Fig. 9] Shows the state of the conventional sewing machine when the sewing machine is off-line and shuts down. [Fig. 10] It shows the state of the conventional sewing machine The bottom surface [Fig. 11] is a sectional view of the side of the needle near the needle line in the conventional state of cutting off the thread. The reference number of the component is shown in Fig. 1... lc… cutting part 2 ··· cutting off-line knife (constituting off-line cutting device) 2a ··· shaft 2b ·· long hole 2c ··· cutting part 2d… applied to potential energy pin 2e… applied to potential energy Part 3 ... Clamping spring 3c ... Clamping part 4 ... Rewinding lever 4a ... Fortunately, 4b ... Screw 40 ... The body of the rewinding lever 40c ... (Offline capture member moving device) 40d · '· Cam section (Offline capture member moving device) 41 ... Rewinding plate 400 of the lower lever 400 ... Reverse lever 440 ... Body of the lower lever 5 ... Component shifting (please read the precautions on the back before filling this page) ~ -------- a11 --------- " ^^^ 丨 This paper is suitable for h + si fresh ( CNS) A4 & Grid (21,297 mm) > / i kJ ilr

V. Description of the invention (20. Printing brake device of the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs) 5a ··· shaft 5 b… the car is composed of 6… connecting rods 6 a ··· 6b… shaft 7… the swinging member 30 Capture plate base 30a of the offline capture member ... protrusion 30b ... cam portion (moving device of the offline capture member) 30c ... cam portion (moving device of the offline capture member) 7a ··· shaft 8 ... needle plate 3bu ·· offline Bottom line capture plate 8a ... brake 8b ... cutout portion 31a ... line tension portion 32 ... tension spring 10 ... plier-type opening mechanism 33 ... line capture member 11 ... potential energy member 50 ... linking rod (line capture Component 11 a ·. 'Shaft moving device） 11 b. ·· Shaft 50a ··· Offline thread catching member movement 12 ... Long hole of link device 15 ... Needle plate 55 ... Stopper pin 15 a ... Needle eye ... Offline thread catching plate 15b ·· Long blade insertion hole 140 · .. Lower thread rewinding lever 20 ... Lower thread cutting device 140a ... Support shaft (Please read the precautions on the back before filling this page) 1 / ------- I I--I — IIII ·

Claims (1)

The Consumer Property Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs printed No. 89 and No. 14 patent towels, and applied for a full-time application. The amendment date: June 1990 1.-A kind of sewing machine lower thread cutting device, which is characterized by: 彳The thread is dry, it is fitted with a lower thread from the object to be sewn and reaches the shuttle through the eye formed on the needle plate of the initial sewing machine, and the lower thread is drawn closer in a direction intersecting with the lower thread, and from The shuttle pulls out a predetermined amount of the lower thread; and, the lower thread cutting device 'is a person who cuts the lower thread near the eye of the needle by pulling the lower lever by the thread-removing action arranged below the needle plate; The lower thread cutting device includes: a lower thread catching member, which is arranged between the lower needle cutting plate and the lower thread cutting device in the up-and-down direction, and is removable-located below the eye of the needle, so that the length from the cloth to the cut value is set to the lower thread length Between a shortened action position and a standby position spaced from the eye of the needle without hindering the movement of the needle; and Position, and after sewing, it will move from the standby position to the active position when the thread is disconnected from the lower thread_device. 2 .: The sewing machine is cut off and placed under the item i in the scope of patent application. When moving from the standby position to the active position, the down-line capture material will be captured by the under-eye line and guided under the eye . 3. ^ Lower thread cutting device for juvenile sewing machine under item 1 of the scope of patent application, wherein when moving from the standby position to the active position, the lower line is pinched, and the self-sewn product is cut to the lower thread. The lower thread cutting position is shortened.乂 ▲ Applicable scales ^ ------ ΐτ ------ ^ __ (Please read the notes on the back before filling in this page) m 470799 A8 B8 C8 D8 VI. Scope of patent application 4. Rushen B The first item of the monthly patent scope of the sewing machine under the thread cutting device, the inch of the rewinding rod and the lower thread catching member are embedded through the cam portion, and, by the drive of the rewinding rod, change the cam portion Fitting ... Drives the offline capture member. Heart '5. If the undercut line of the sewing machine in the scope of patent application No. 1 is cut off, the swinging member driven by the system will be operated at the same time. At the same time, the rewinding rod and the / member are connected to the swinging member via a -link, and then , Borrow. ㈣Supply rods and offline capture members can be driven ¾ ------ ΐτ (Please read the notes on the back 'before filling out this page) The Intellectual Property Bureau of the Ministry of Economic Affairs's Consumer Cooperatives printed the standard I country- For i, use j, Λ-NI centimeter on paper