KR20080114533A - Yarn controlling device of chain stitch sewing machine - Google Patents

Abstract

A yarn controlling device of chain stitch sewing machine is provided to remove bound and adhered looper thread because an amount of the looper thread bound and adhered to a shaft part is very small and to control a tension of the looper thread. A yarn controlling device of chain stitch sewing machine comprises a lower axis, a looper, two threads passing parts(12), a thread controlling cam(14) and a yarn guide member(15). The lower axis is rotated by rotation of a motor in the sewing machine. The looper is shaked and operated by the rotation of the lower axis. The thread controlling cam and the yarn guide member are arranged between the two threads passing parts. The yarn guide member contains a long aperture part for moving the looper thread along a fixed direction. The yarn controlling device of chain stitch sewing machine gives a tension according to change of a diameter of the two threads passing parts to the looper thread. The yarn guide member comprises the yarn controlling device.

Description

YARN CONTROLLING DEVICE OF CHAIN STITCH SEWING MACHINE}

The present invention relates to a thread control apparatus of a round bar sewing machine for controlling the tension of a looper thread.

A sewing machine having a looper swinging below the needle plate and performing an overlock stitch or a double chain stitch (double round bar) is a looper loop which the looper captures a loop of the upper thread inserted into the sewing needle and a looper thread inserted into the looper. The sewing is repeated by repeating the operation of the sewing needle to sew.

At this time, as the thread control device for maintaining the tension of the looper seal constant, as shown in Fig. 13 (a), the two thread passage member (111, 112) as the path of the looper seal (L1) and the lower shaft Two thread control cams 113 and 114, the outer peripheral portion of which is slidably contacted to the looper seal L1 passing between the thread passages, and between the two thread control cams and sliding to the two thread control cams. BACKGROUND OF THE INVENTION A sewing machine having a thread control device 110 having a thread guide member 115 having an elongated hole 115a for passing the contacting looper thread L1 is widely used.

In the seal control apparatus 110, the looper seal L1 released from the bobbin (not shown) disposed on the right side of FIG. 13 (a) includes the hole 111a of the thread passage part 111, The long hole 115a of the seal guide member 115 and the hole 112a of the seal passage 112 are sequentially provided. In addition, the thread control cams 113 and 114 slide with the looper seal L1 between the seal passage 111 and the seal guide member 115 and between the seal passage 112 and the seal guide member 115, respectively. In contact, the tension of the looper seal L1 is maintained by applying tension to the looper seal L1.

By the way, during the sewing operation of the sewing machine using the thread control device 110, the looper thread L1 may be cut off on the looper side than the thread passage part 111 due to the swinging of the looper. In this case, as shown in Fig. 13 (b), the bobbin-side portion of the looper thread L1 that caused the thread cutting is hung from the thread guide member 115 or the thread passage part 112, and the looper thread ( When the hanged-up part of L1 is wound by sliding contact with the shaft part 102a between the said thread control cams 113 and 114, and wound around the shaft part 102a several times according to the rotation of the lower shaft 102, There is. As described above, the removal of the looper seal L1 wound around the shaft portion 102a is very complicated and requires a lot of time, which greatly burdens the operator and significantly reduces the efficiency of the sewing work. In addition, in the case of cutting the looper seal L1 wound around the shaft portion 102a by using a knife or the like at the time of removal, the cut may be caused by accidentally touching the surface of the thread control cams 113 and 114 with the knife. It may happen. At this time, in the sewing work performed after the looper thread is removed, the looper seal L1 is likely to be caught in the wound portion, so that the looper seal L1 may be easily cut and wound.

For this reason, the thread cutting blade which operates so that contact and non-contact is repeated with respect to the looper seal L1 on the path | route of the looper seal L1 on the bobbin side rather than the thread control cam 114, and the looper seal L1 is provided. It is well known that the blade cuts the looper thread L1 by contacting the looper thread L1 when the winding of the wafer occurs (for example, Patent Document 1).

[Patent Document 1] Japanese Utility Model Publication H3-55077

However, in the conventional sewing machine according to Patent Literature 1, the blade is configured to act when the looper thread L1 is pulled out when the blade provided in parallel with the path of the looper thread L1 is in contact with the looper thread L1. It is. For this reason, depending on the thickness and the material of the looper seal L1, the looper seal L1 slides with respect to the blade, and the blade does not function sufficiently, so that thread cutting may not be performed. Therefore, when a cut is not made, a large amount of looper thread L1 is wound, but there is a problem that it is very complicated to remove the wound looper thread L1.

In addition, since the blade for cutting the thread is separately provided on the path of the looper thread L1, there is a problem that the design of the sewing machine is limited in order to provide an installation space of the blade. In addition, the sewing machine of the prior art according to Patent Document 1 repeats contacting and non-contacting with respect to the looper thread L1 so that the cutting of the looper thread L1 is performed only when the blade is wound around the looper thread L1. Since the operating mechanism is complicated, not only the design of the sewing machine is complicated, but there is a problem in that a configuration for cutting the thread is expensive.

In view of the above-described problems, an object of the present invention is to prevent the looping yarn from being wound more appropriately.

The invention according to claim 1 is arranged between a lower shaft which rotates by the rotation of a sewing machine motor, a looper that swings in conjunction with the rotation of the lower shaft, two thread passages, and two thread passages. And between two thread control cams provided on the lower shaft and the two thread control cams so that the looper seals intersecting between the two thread passages are in sliding contact with the outer circumference thereof. And a thread guide member having an elongated hole for reciprocating the looper seal in a predetermined direction while the looper seal being in contact with the insertion tube is provided, and gives tension to the looper seal according to a change in diameter of the two thread control cams. In the thread control device of a round bar sewing machine, the thread guide member (15) has an inner edge portion on the lower shaft side in the longitudinal direction of the elongated hole portion. It is characterized in that it is provided with a thread cutting means (15b) provided on the way so that the looper seal can be cut.

The invention according to claim 2 is, in the thread control apparatus for a round bar sewing machine according to claim 1, the outer side of the thread control cam on the looper thread supply source side than the thread control cam on the looper thread supply source side. And a thread capturing member secured to the frame at a position between the lower shafts and capable of capturing an end of the looper seal.

The invention according to claim 3 is, in the thread control apparatus for a round bar sewing machine according to claim 1, the first cylindrical portion 14a provided on the side of the looper thread supply source side of the thread control cam, and the first agent. It is characterized by including the cutting member 21 which is arrange | positioned in the vicinity of the outer peripheral surface of 1 cylindrical part, and the said looper seal | cutable was cut | disconnected.

In the invention according to claim 4, in the thread control apparatus of the round bar sewing machine according to claim 3, the second cylindrical portion 4 is fixed to the sewing machine frame and allows the lower shaft to be inserted. One end of the cylindrical portion is inserted into the end of the end positioned on the looper seal supply source side of the first cylindrical portion, and is arranged.

The invention according to claim 5 is a thread control device for a round bar sewing machine according to claim 1, wherein the thread cutting means is adapted to change the looper thread according to a change in diameter accompanying rotation of the thread control cam. And a thread hook portion 15b which cuts the looper thread in accordance with the change of the diameter.

The invention according to claim 6 is characterized in that the thread cutting means is a recess formed in the inner edge portion of the thread control device of the round bar sewing machine according to claim 5.

The invention according to claim 7 is the thread control device for a round bar sewing machine according to claim 5, wherein the thread cutting means is a convex portion formed at the inner edge portion.

According to the invention described in claim 1, when the cut looper thread is wound around the shaft portion of the gap generated between the two thread control cams, the thread cutting means cuts the looper thread. At this time, the thread cutting means is provided in the middle side of the inner edge part used as the lower shaft side among the two inner edge parts along the longitudinal direction of the long hole part formed in the thread guide member. That is, the thread cutting means is provided so as to cut the looper seal only when the cut looper seal is wound on the lower shaft so that one end of the looper seal is pulled toward the lower shaft side. This prevents the thread cutting means from cutting the looper thread unnecessarily during normal sewing operations, and only if the looper thread cut for some reason is wound around the shaft portion of the gap generated between the two thread control cams. To cut. Therefore, the reliability of the sewing machine is further improved.

In addition, the thread cutting means cuts the looper thread before a large amount of looper thread is wound up. At this time, the supply source end of the looper seal cut by the thread cutting means is removed by the yarn control cam on the looper yarn supply source side of the two yarn control cams, and is not rewound to the shaft portion. Thereby, since the looper seal | sticker wound around the said shaft part becomes very small quantity, removal of the wound looper seal | sticker becomes easy. Therefore, the conventional problem that the removal of the looper thread was very complicated due to the winding of a large amount of looper thread can be solved, and the reliability and comfort of the sewing machine is greatly improved.

In addition, since the thread cutting means is provided at the inner edge portion of the elongated hole formed in the thread guide member, it is unnecessary to secure the space for installing the member and the blade for fixing the separate blade as in the prior art, and the design of the sewing machine The degree of freedom is further improved.

In addition, since the thread cutting means does not require a mechanism for repeating contact and non-contact with respect to the looper thread as in the prior art, the configuration for cutting the looper thread becomes very simple, and the design of the sewing machine becomes easier. Rather, it is possible to provide a sewing machine which can cut the looper thread when the looper thread is wound at a very low cost.

In addition, the thread cutting means is not limited to a knife shape. For example, as in the invention described in claim 5, the structure of the looper seal supply source side may be a structure that captures the movement of the looper seal moving along the inner edge portion of the lower shaft side and prevents it on the way. As a result, the looper seal is pulled out by the lower shaft and the thread control cam on the looper seal supply source side, so that the looper seal can be pulled out, and as a result, it functions as a thread cutting means.

According to the invention described in claim 2, the thread capturing member is provided on the looper seal supply source side rather than the outer periphery of the seal control cam on the looper seal supply source side, and is provided at a position between the outer periphery and the lower shaft. That is, the edge part of the looper seal which was separated on the side surface side of the looper seal supply source side of the seal control cam of the side near the looper seal supply source can be captured. As a result, the end of the looper seal cut is formed in a gap formed between the side surface of the loop control chamber supply side of the seal control cam on the looper chamber source side and the bearing provided on the side surface side of the bearing rotatably supporting the lower shaft. It can be prevented from sticking. Therefore, it is possible to solve the problem that the removal of the looper thread is very complicated due to the large amount of looper thread wound around the gap, thereby greatly improving the reliability and comfort of the sewing machine.

According to the invention described in claim 3, the first cylindrical portion is integrally provided with the seal control cam at the side of the looper seal supply source side of the seal control cam at the looper seal supply source side, and allows the lower shaft to pass through. That is, the first cylindrical portion is provided so as to cover the outer circumferential portion of the lower shaft 2 on the side of the looper seal supply source side of the seal control cam. Thereby, when the edge part of the cut looper seal cut | disconnected is located in the side surface side of the looper seal supply source side of the said thread control cam, a looper seal winds up on the outer peripheral part of a 1st cylindrical part. Therefore, the looper seal can be prevented from being wound on the lower shaft. In addition, at this time, since the blade part arrange | positioned adjacent to the outer peripheral part of the cylindrical part of a cutting member cuts the looper thread wound around the 1st cylindrical part, the looper seal is cut | disconnected without winding in large quantities to the outer peripheral part of a 1st cylindrical part. Therefore, when the looper thread breaks, the looper thread is wound around the lower shaft in a large amount, and the problem of removing the looper thread very complicated can be solved, and the reliability and comfort of the sewing machine is greatly improved.

According to the invention as claimed in claim 4, the end portion of the looper thread supply source side of the first cylindrical portion is arranged to insert a second cylindrical portion fixed to the sewing machine frame therein. For example, the end of the looper seal supply source side of the first cylindrical portion passes through the bearing of the lower shaft therein. That is, the outer circumferential surface of the lower shaft is completely covered by the first cylindrical portion and the second cylindrical portion between the side of the looper seal supply source side of the seal control cam on the looper seal supply side and the bearing. Thereby, the edge part of the looper seal cut | disconnected to the outer peripheral surface of the lower shaft between the side of the looper seal supply source side of the seal control cam of the looper seal supply source side, and the said bearing can be prevented. Therefore, it is possible to solve the problem that the removal of the looper thread is very complicated due to the large amount of looper thread wound around the gap, thereby greatly improving the reliability and comfort of the sewing machine.

According to the invention described in claim 5, the thread cutting means is a thread hook portion for hanging a looper thread. In other words, when the cut looper seal is wound around the lower shaft and one end of the looper seal is pulled toward the lower shaft side, the looper seal is a thread hook portion provided on the inner edge portion of the lower shaft side of the long hole of the seal guide member. Takes on At this time, the looper seal has a force that is tensioned by the looper thread wound around the shaft portion of the gap generated between the two thread control cams with the thread hook portion as a supporting point, and the thread control cam on the looper thread supply source side. The tension of the looper seal is changed by sliding. That is, the looper seal is stretched in two different directions with the thread hook portion as a supporting point. As a result, the looper thread is pulled off by the thread hook portion and cut. Therefore, it is not necessary to process the thread cutting means into a knife shape, so that the thread cutting means can be provided at a lower cost.

According to the invention according to claim 6, the thread cutting means is a recess formed in the inner edge portion of the elongated hole portion formed in the thread guide member, so that the wound looper thread can be cut without installing a separate blade or the like. .

In addition, the thread cutting means can be provided without a significant design change to the conventional thread control device. Therefore, the thread cutting means can be provided at a lower cost.

According to the invention of claim 7, the thread cutting means is a convex portion formed on the inner edge portion of the elongated hole portion formed in the thread guide member, so that the looper thread wound up can be cut without installing a separate blade or the like. .

In addition, the thread cutting means can be provided without a significant design change to the conventional thread control device. Therefore, the thread cutting means can be provided at a lower cost.

(Overall configuration of embodiment of sewing machine according to the present invention)

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail, referring drawings.

The sewing machine according to the present invention is a sewing machine for sewing using a looper thread (L) guided by a looper provided below the needle plate, and has a thread control device (10) for controlling the tension of the looper thread (L). It is a sewing machine.

1 is a perspective view showing the configuration of a thread control device 10 provided in the sewing machine according to the present invention.

The sewing machine includes a lower shaft 2 provided inside the bed portion of the sewing machine frame and a sickle-shaped protrusion that swings in conjunction with the rotation of the lower shaft 2 below the needle plate provided on the upper surface of the bed portion. And a bobbin (not shown) as a supply source of the looper seal L guided by the looper, and a thread control device 10 provided to be located on the path of the looper seal L between the looper and the bobbin. have.

In addition, the sewing machine has a well-known configuration in which the needle bar for keeping the sewing needle at the lower end moves in synchronization with the upper shaft rotated by the sewing machine motor, and the rotation of the upper shaft is transmitted to the lower shaft 2.

The looper disposed below the needle bar has a hole portion through which the looper seal L passes through the distal end of the sickle-shaped protrusion, and is swinging by the rotation of the lower shaft 2, so that the looper cooperates with the needle to form needle stitches of the round bar. It's a looper.

In addition, the rotation of the lower shaft 2 operates the yarn control device 10. The operation of the room controller 10 will be described later.

(Room control device)

Next, the seal control apparatus 10 is demonstrated in detail.

As shown in FIG. 1, the thread control apparatus 10 is provided above the lower shaft 2, and the thread passage part 11 in which the hole part 11a, 12a which becomes the path | route of the looper seal L is formed, 12) and a seal control which is fixed to the lower shaft and is provided to shield between the thread passages 11 and 12, the outer periphery of which is in sliding contact with the looper seal L passing through the hole portions 11a and 12a. The seal guide member 15 and the thread passage part 11 which are provided between the cam 13 and 14, and the thread control cam 13 and 14, and the long hole part 15a which becomes the path | route of a looper seal L is formed. 12 and a rotating member 16 for supporting the seal guide member 15 in a vertically rotatable manner. In addition, the sewing machine includes bearings 3 and 4 fixedly held on the sewing machine frame to rotatably support the lower shaft 2, and looper seals provided on the sewing machine frame and derived from bobbins as a supply source of the looper seal L ( A seal capturing member 20 provided on the seal path portion 5 serving as a path of L) and a gap 2b provided on the bearing 4 and covering the gap 2b formed between the seal control cam 14 and the bearing 4 from the upper surface; 5).

The thread passages 11 and 12 and the seal guide member 15 are supported by the rotation member 16. The rotating member 16 is rotatably supported on the sewing machine frame so that its base end (inside of FIG. 1) approaches / separates the front end (front of FIG. 1) in the vertical direction of the lower shaft 2. . The thread passage portions 11 and 12 and the seal guide member 15 are provided at the distal end portion of the rotating member 16, and the position at the time of use of approaching the lower shaft 2 by the rotation of the rotating member 16 ( The position in FIG. 1 and the non-use position (see FIG. 7) spaced upwardly from the lower shaft 2 for maintenance or the like can be switched.

As described above, the hole passages 11 and 12 are formed with hole portions 11a and 12a serving as paths for the looper seal L. As shown in FIG. Moreover, the elongate hole 15a used as the path | route of the looper seal L is formed in the seal guide member 15. As shown in FIG. The looper seal L derived from the seal path portion 5 first passes through the hole portion 12a, then passes through the long hole portion 15a, and finally passes through the hole portion 11a to be drawn out to the looper. . At this time, the looper seal L is in sliding contact with the outer circumferential portion of the yarn control cam 14 between the hole portion 12a and the long hole portion 15a, and between the long hole portion 15a and the hole portion 11a. Sliding contact with the outer peripheral portion of the control cam 13.

When the rotating member 16 is in the position at the time of use, the seal guide member 15 is inclined so that the front end side (lower shaft side end portion 15c side) of the long hole portion 15a is higher (upper in FIG. 2). It is arranged in a state.

As shown in FIG. 4, the outer peripheral part of the thread control cam 13 and 14 which rotates with the clockwise rotation of the lower shaft 2 is an inner edge of the lower side (lower shaft side) of the elongate hole 15a. It moves toward the inner edge part 15e of the upper side (needle plate side) of the long hole part 15a from the part 15d side.

Moreover, the notch part 15b which is a recessed part cut out below is formed in the longitudinal middle part in the inner side edge part 15d of the lower side of the elongate hole part 15a. In addition, the notch part 15b is mentioned later.

The thread control cams 13 and 14 have the same shape, and the shape of the outer peripheral part changes so that a part of an outer peripheral part may become larger diameter part than another part (small diameter part). 3 is a state where the large diameter portions of the thread control cams 13 and 14 are in contact with the looper seal L. FIG.

The seal control cams 13 and 14 use the lower shaft 2 as the rotation shaft, and the looper seal L is in sliding contact with the outer peripheral portion thereof at the same time as the rotation. That is, when the thread control cams 13 and 14 are rotated by the rotation of the lower shaft 2, the timing at which the small diameter portions of the thread control cams 13 and 14 are in sliding contact with the looper seal L (in Fig. 1). State) and the timing (state of FIG. 3) in which the large diameter parts of the thread control cams 13 and 14 are in sliding contact with the looper seal L, whereby the path of the looper seal L becomes the thread guide member. It changes in the longitudinal direction in the elongate hole 15a of (15).

At this time, the timing of the diameter change with respect to the looper seal L of the yarn control cams 13 and 14 corresponds to the swing timing of the looper.

For example, when the looper retreats with respect to the sewing needle, the distance between the looper and the thread control device 10 becomes short. At this time, the thread control cams 13 and 14 operate so that the large diameter part comes into sliding contact with the looper seal L. FIG. Thereby, the looper seal L between the hole part 11a of the thread passage part 11 to the looper is tensioned by the thread control cam 13, and the looper seal between the looper and the hole part 11a ( Since tension is applied to L), the looper seal L is not loosened. At this time, the seal control cam 14 tensions the looper seal L on the seal path portion 5 side. Thereby, the looper seal L is taken out from the bobbin as a supply source of the looper seal L. FIG.

On the other hand, when the looper advances with respect to the sewing needle, the distance between the looper and the thread control device 10 becomes long. At this time, the thread control cams 13 and 14 are in sliding contact with the looper seal L, and accordingly, the looper thread loosened as the thread control cams 13 and 14 move from the large diameter part to the small diameter part. (L) is stretched by the looper so that it is loose, and tension is given. In this way, the tension of the looper seal L corresponding to the swing of the looper is maintained.

During normal sewing operations, that is, the looper seal L when no thread cutting occurs, the long hole 15a of the seal guide member 15 is caused by sliding contact with the outer peripheral portions of the thread control cams 13 and 14. Displace the path within). Specifically, from the path of the looper thread L shown in FIG. 4 (a), through the path of the looper thread L shown in FIG. 4 (b), the looper thread shown in FIG. 4 (c) ( Is displaced in the path of L). At this time, as shown in FIGS. 4A to 4C, since the looper seal L is held at the outer circumferential portion of the thread control cams 13 and 14, the long hole 15a of the seal guide member 15 is provided. ) Is displaced without contacting the lower inner edge portion 15d. That is, when thread cutting does not occur, the looper seal L does not get caught by the notch 15b.

(Cutting and winding of looper thread)

Generally, the cutting of the looper thread L during the sewing operation by the sewing machine often occurs on the side closer to the looper (left side in FIG. 5) than the thread control cam 13. When the looper seal L is cut, as shown in FIG. 5 (b), the cut end L1 of the looper seal L is formed by the thread control cam 13 according to the rotation of the lower shaft 2. It is removed by sliding with the outer periphery, and comes out of the hole part 11a of the thread passage part 11, and falls out. At this time, as shown in FIG.5 (c), when the end part L1 of the looper seal L falls between the thread control cam 13 and the thread guide member 15, the end part L1 ) Is wound around the outer periphery of the shaft portion 2a by sliding contact with the shaft portion 2a between the thread control cams 13 and 14, and the yarn is pulled out from the bobbin side (right side in FIG. 5) to the looper seal L. This becomes more wound up.

(Thread cutting means)

As described above, when the end L1 is separated, the looper seal L comes into contact with the inner edge 15d of the lower side of the long hole 15a of the seal guide member 15. Then, when the lower shaft 2 continues to rotate in the state where the looper seal L starts to be wound on the shaft portion 2a, the looper seal L is formed by the seal control cam 14 to seal the seal guide member 15. The long hole 15a is guided through the path of Figs. 6 (a) to 6 (c). That is, when the seal control cam 14 and the looper seal L are in sliding contact with the end L1 wound around the shaft portion 2a, the path of the looper seal L is lower than the long hole 15a. It is displaced so as to come closer to the right side from the left side of FIG. 6 while slidingly contacting with the inner edge portion 15d. Therefore, as shown in FIG. 6 (b), the looper seal L displaced so as to be in sliding contact with the inner edge portion of the lower shaft side of the elongated hole portion 15a is directed downward to the inner edge portion 15d. It is caught by the cut notch 15b.

As for the notch part 15b, the edge of the back side of the movement direction is standing upright. Therefore, as shown in Fig. 6 (c), the looper seal L is engaged with the rear end edge of the notch portion 15b, and the movement of the looper seal L to the rear side in the moving direction is prevented, The lower shaft 2 is further rotated so that tension is applied by the thread control cam 14 so that the looper seal L is pulled off by the rear end edge of the notch 15b.

That is, the looper seal L on the path | route from the notch part 15b to the shaft part 2a is tensioned in the arrow B direction. Accordingly, the looper seal L is stretched in the arrow A direction and the arrow B direction with the notch portion 15b as a supporting point, whereby a very strong locking force acts on the position of the notch portion 15b. By this tension, the looper seal L is torn off and cut off using the notch 15b as a supporting point. Therefore, the notch part 15b functions as a "thread hook part" and a "thread cutting means".

In addition, as shown in FIG. 2, the notch part 15b prevents the notch part 15b from slipping out from the notch part 15b before the looper seal L caught by the notch part 15b is cut | disconnected. ), The angle of the side part of the side which locks the looper seal L, and the protrusion part 15f which the inner edge part 15d of the lower shaft side of the elongate hole part 15a forms is more than 0 degree and is below a right angle. desirable.

In addition, the length of the looper seal L wound around the shaft portion 2a is cut by the notch portion 15b from the end L1 on the looper seal supply source side when the looper seal L breaks. Only the length to the end of the looper seal L is obtained. Accordingly, even if the lower shaft 2 is rotated to some extent after the looper thread L is broken during the sewing operation of the sewing machine, the amount of the looper thread L wound around the shaft portion 2a is only a small amount. Therefore, the looper seal L wound around the shaft portion 2a can be easily removed.

When removing the looper seal L wound around the shaft portion 2a, the operation of the sewing machine is stopped, and then the cover part (not shown) provided on the upper surface of the bed part located above the thread control device 10 is opened. As shown in FIG. 7, by manually rotating the rotating member 16, the manual operation of each part of the thread control device 10 is facilitated. Then, the looper seal L wound around the shaft portion 2a by tweezers or the like is removed.

In addition, the edge part L2 (refer FIG. 8) by the looper seal supply source side among the looper seals L cut | disconnected by the notch part 15b is mentioned later.

(Thread catching member)

Next, the seal capture member 20 will be described in detail.

As shown in FIG. 5, the seal trapping member 20 covers the upper half of the gap 2b formed between the seal control cam 14 and the bearing 4 among the outer circumferential surfaces of the bearing 4. It is installed. In addition, a band-shaped napping along the arc of the outer circumferential portion of the bearing 4 is formed on the surface of the thread capturing member 20. When the end of the thread falls on the surface, the end of the thread is captured by the frictional force. . In addition, the thread capture member 20 includes the side end portion and the yarn control cam 14 so that a gap does not occur between the side end portion of the yarn control member 14 and the yarn control cam 14 of the yarn capture member 20. It is provided so that it may contact.

As shown to Fig.8 (a), the looper seal supply source side edge part L2 of the looper seal L cut | disconnected by the notch part 15b is removed by the thread control cam 14. As shown in FIG. At this time, as shown in FIG. 8 (b), the looper seal L falls into the gap between the thread control cam 14 and the rotation member 16. In this case, as shown in FIG.8 (c), the edge part L2 falls to the upper surface part of the thread capture | acquisition member 20, is captured by the raising formed in the upper surface part, and is not moved afterwards. That is, since the end part of the looper seal L is captured by the thread trapping member 20, it does not enter and wind up between the clearance gap 2b which arises between the thread control cam 14 and the bearing 4, and is not wound. Therefore, the end part L2 of the looper seal L cut | disconnected by the notch part 15b does not rewind, and the looper seal L cut | disconnected can be processed more easily.

In addition, when the looper seal L is cut off, the end L1 of the looper seal supply source side is removed by the seal control cam 14 without being wound around the shaft portion 2a, and the seal control cam 14 and the rotating member 16 are removed. ) May fall into the gap between. In this case, the end L1 is captured by the yarn capturing member 20, and then does not move. Therefore, the looper seal L is not wound up.

In addition, the process of the edge part L1, L2 of the looper seal L captured by the thread capture member 20 is made substantially the same as the process of the looper seal L wound around the shaft part 2a. That is, after the operation of the sewing machine is stopped, the cover part (not shown) provided on the upper surface of the bed part located above the thread control device 10 is opened, and as shown in FIG. 7, the rotating member 16 is moved upward. It rotates to facilitate manual operation of each part of the thread control device 10. Then, the end portions L1 and L2 of the looper seal L captured by the thread catching member 20 by tweezers or the like are removed, and the looper seal L is formed into the hole 12a and the long hole 15a. And the looper seal L is guided by the operator so as to guide the looper through the hole 11a.

(Effects of the sewing machine according to the embodiment described above)

According to the above-described embodiment, when the cut looper seal L is wound around the shaft portion 2a between the two thread control cams 13 and 14, the notch part 15b hangs the looper seal L. FIG. Cut. At this time, the notch part 15b is formed in the inner edge part 15d which becomes the lower side of two inner edge parts along the longitudinal direction of the elongate hole part 15a formed in the seal guide member 15. As shown in FIG. That is, the notch portion 15b is installed so as to cut the looper seal L only when the cut looper seal L is wound on the lower axis so that one end of the looper seal L is tensioned toward the lower axis side. It is. As a result, the cutout 15b is not unnecessarily cut off the looper seal L during the normal sewing operation, and the cut looper seal L is cut between the thread control cams 13 and 14 for some reason. The looper seal L is cut only when it is wound around the shaft portion 2a. Therefore, the reliability of the sewing machine is further improved.

In addition, the notch part 15b cuts the looper seal L before the large amount of looper seal L is wound around the rotation of the lower shaft 2. At this time, the edge part L2 of the looper seal supply source side of the looper seal L cut | disconnected by the notch part 15b is removed by the thread control cam 14, and it does not wind up again on the shaft part 2a. Thereby, since the looper seal L wound around the shaft part 2a becomes a very small quantity, the removal of the wound looper seal L becomes easy. Therefore, the conventional problem that a large amount of looper thread L is wound up and the removal of the looper thread L is very complicated can be solved, and the reliability and comfort of the sewing machine are greatly improved.

In addition, since the notch 15b is formed at the inner edge of the elongated hole 15a formed in the seal guide member 15, a space for installing the member and the blade for separately fixing the blade as in the prior art is ensured. There is no need to do this, and the design freedom of the sewing machine is further improved.

In addition, since the notch 15b does not need a mechanism for repeating contact and non-contact with respect to the looper seal L as in the prior art, the configuration for cutting the looper seal L becomes very simple, Not only the design of the sewing machine becomes easier, but also the sewing machine capable of cutting the looper thread L when the looper thread L is wound can be provided at a very low cost.

Moreover, the thread capture | acquisition member 20 is provided in the position which is between the outer periphery and the lower shaft 2a rather than the outer periphery of the yarn control cam 14, and is from the said outer periphery. That is, the edge part of the looper seal L which was separated from the side surface side of the looper seal L supply source side of the seal control cam 14 can be captured. Thereby, the looper seal cut | disconnected with respect to the clearance gap 2b which arises between the side surface by the looper seal L supply source side of the yarn control cam 14, and the bearing 4 of the lower shaft 2 provided in the said side surface. It can prevent that the edge part L2 of (L) is wound up. Therefore, a large amount of looper thread L is wound around the gap 2b to solve the problem that the removal of the looper thread L is very complicated, and the reliability and comfort of the sewing machine is greatly improved.

In addition, since the notch 15b is a recess formed in the inner edge portion of the elongated hole 15a formed in the seal guide member 15, the looper seal L wound up can be cut without the need for a separate blade or the like. have. Therefore, as in the prior art, there is no need to secure a space for separately installing the member and the blade for fixing the blade, and the design freedom of the sewing machine is further improved. Moreover, the thread cutting means can be provided without making a significant design change to the conventional thread control apparatus. Therefore, the thread cutting means can be provided at a lower cost.

In addition, since the notch part 15b cuts through a thread, it is not necessary to process the inner edge part of the notch part 15b in a knife shape. Therefore, the thread cutting means can be provided at a lower cost. Further, although the inner edge portion of the notched portion 15b does not work in a knife shape, it functions as a thread cutting means, but it is more preferable to process the inner edge portion of the notched portion 15b in a knife shape.

(2nd embodiment)

Next, 2nd Embodiment is described.

Moreover, in the sewing machine provided with the thread control apparatus 10A, the edge part L1 by the cutting of the looper thread L which arose from the looper side is wound by the shaft part 2a between thread control cams 13 and 14. When it attaches, the structure which the notch part 15b formed in the inner edge part 15d of the lower side of the elongate hole part 15a of the thread guide member 15 cuts, and the notch part 15b The path of the seal | sticker when the looper seal supply source side edge part L2 of the looper seal L cut | disconnected into the clearance gap between the seal control cam 14 and the rotation member 16 is the same as that of 1st Embodiment.

9 and 10, the seal control device 10A according to the second embodiment extends along the axial direction from the side of the looper seal supply source side of the seal control cam 14 in the axial direction. ), A cylindrical portion 14a provided integrally with the blade, and the blade portion 21a is provided with a thread cutting blade 21 provided near the outer peripheral portion of the cylindrical portion 14a.

The cylindrical part 14a rotates with the rotation of the seal control cam 14, and is provided so that the bearing 4 may be inserted in the inner side (inner diameter side) of a cylindrical end part. That is, the clearance gap 2b which exists between the seal control cam 14 and the bearing 4 is covered by the cylindrical part 14a. Thus, the cylindrical portion 14a functions as a "first cylindrical portion." In addition, the bearing 4 functions as a "second cylindrical part".

As shown in FIG. 10, the thread cutting blade 21 has the blade part 21a arrange | positioned close to the circumferential outer peripheral part of the cylindrical part 14a. In addition, the thread cutting blade 21 is fixedly supported by the sewing machine frame.

In FIG. 11, the looper seal supply source end L2 of the looper seal supply source end L1 or the looper seal L cut | disconnected by the notch part 15b when the looper seal L cut | disconnected is shown in FIG. Similar to 8 (b), it may fall into the gap between the seal control cam 14 and the rotation member 16 in some cases. In this case, the edge part L1 or L2 of the looper seal L contacts the outer peripheral part of the cylindrical part 14a. At this time, if the thread control cam 14 is rotating because the sewing operation by the sewing machine is being continued, the looper seal L is wound by the rotation of the cylindrical portion 14a and wound around the cylindrical portion 14a.

The looper seal L wound around the cylindrical portion 14a is wound along the circumferential outer periphery of the cylindrical portion 14a, as shown in FIG. 11, and the winding of the looper thread L proceeds to form a cylindrical portion ( When the double circumference of the outer periphery of 14a) is about to be doubled, the looper seal L wound up by adding the thickness to the outside of the outer periphery of the cylindrical portion 14a is wound on the blade portion 21a of the thread cutting blade 21. In contact, the looper seal L is cut off. Therefore, the thread cutting blade 21 functions as a "cutting member".

Thereafter, the looper seal L wound around the cylindrical portion 14a by tweezers or the like is removed.

That is, when the sewing machine with the thread cutting device 10A cuts the looper seal L on the side closer to the looper than the thread control cam 13 during the sewing operation, the end L1 on the looper thread supply source side is 2 When wound around the shaft portion 2a between the two thread control cams 13 and 14, the notch portion 15b cuts the looper seal L wound around the shaft portion 2a in the same manner as in the above-described embodiment. Moreover, the end part L2 of the looper seal supply source side of the end of the looper seal L cut | disconnected by the notch part 15b falls in the clearance gap between the seal control cam 14 and the rotation member 16, and the cylindrical part 14a is carried out. ), The blade portion 21a of the thread cutting blade 21 cuts the looper seal L. As shown in FIG. In addition, the end L1 of the looper seal L is removed by the seal control cam 14 without being wound around the shaft portion 2a, and falls into a gap between the seal control cam 14 and the rotation member 16 and is cylindrical. Even when wound around the portion 14a, the blade portion 21a of the thread cutting blade 21 cuts the looper seal L. As shown in FIG. As a result, problems such as the looper seal L being wound in large quantities on each part of the lower shaft 2 where the looper seal L such as the shaft portion 2a and the gap 2b are likely to be wound may occur. To prevent them.

(Operation effect of the sewing machine according to the second embodiment)

According to the second embodiment, when the looper seal L falls into the gap between the thread control cam 14 and the rotation member 16, the looper seal L is wound around the outer peripheral part of the cylindrical portion 14a. Moreover, the looper seal supply source side end part of the cylindrical part 14a is arrange | positioned so that the bearing 4 may be inserted in the inside. That is, the clearance 2b which arises between the side surface by the looper seal supply source side of the seal control cam 14, and the bearing 4 is located inside the cylindrical part 14a. Thereby, the edge part L1 or L2 of the looper seal L cut | disconnected in the clearance gap 2b can be prevented from sticking.

In addition, since the blade part 21a of the thread cutting blade 21 cuts the looper seal L wound around the cylindrical part 14a, the looper seal L is wound by the outer peripheral part of the cylindrical part 14a in large quantities. It is cut without sticking. Therefore, when the looper thread L cuts, the looper thread L is wound around the gap 2b in a large amount, thereby eliminating the problem that the removal of the looper thread L is very complicated. Reliability and comfort are greatly improved.

(Etc)

It is a side view which shows the structure of other embodiment of a seal guide member.

In addition, the thread cutting means in embodiment mentioned above and 2nd embodiment is the notch part 15b as a recessed part formed in the inner edge part of the lower side of the elongate hole 15a of the thread guide member 15, and the shaft part 2a. Any mechanism that can hang and cut the looper seal L, which is moved so as to slide in contact with the inner edge portion when wound on the sheet). For example, as shown in FIG. 12, the convex part 15Ab formed in the inner edge part of the lower axis side of the elongate hole 15Aa of the seal guide member 15A may be sufficient. In addition, among the structure of the seal control apparatus which used the said seal guide member 15A, the structure other than the seal guide member 15A is the same as the seal control apparatus 10 in embodiment mentioned above. Moreover, the side part of the side which clamps the looper seal L among the recessed parts 15Ab so that the looper seal L caught by the recessed part 15Ab may not slip out of the recessed part 15Ab before being cut | disconnected. And the angle of the locking fixing portion 15Af formed by the inner edge portion 15Ad on the lower shaft side of the long hole portion 15a are preferably greater than 0 degrees and less than orthogonal.

Also in the case of such a structure, like the above-mentioned embodiment, since the convex part 15Ab is the convex part formed in the inner edge part of the long hole part 15Aa formed in the seal guide member 15A, a separate blade or the like is not provided. It is possible to hang and cut the wound looper seal L without the need. Therefore, as in the prior art, there is no need to secure an installation space of the member and the blade for fixing the separate blade, further improving the design freedom of the sewing machine. In addition, the thread cutting means can be provided without a significant design change to the conventional thread control device. Therefore, the thread cutting means can be provided at a lower cost.

In addition, the inner peripheral part of the notch part 15b of the seal guide member 15 may be shaped in the shape of a knife. In this way, the looper seal L caught on the notch 15b is more suitably cut.

In addition, the side part of the side which clamps the looper seal L among the recessed parts 15Ab of the seal guide member 15A may be shaped in the shape of a knife. In this way, the looper seal L caught on the locking fixing portion 15Af is more suitably cut. At this time, the inner edge portion 15Ad of the lower shaft side near the locking fixing portion 15Af is also shaped into a knife shape in addition to the side portion of the recess 15Ab that locks the looper seal L, thereby making it more suitable. The looper seal L can be cut.

Further, the seal capturing member does not necessarily need to be provided on the outer circumferential surface of the bearing 4, and the ends L1 and L2 of the looper seal L do not fall into the gap 2b so that What is necessary is just to be in the position which can capture the edge part L1, L2. For example, a thread capturing member may be provided on the upper surface of the sewing machine frame which is fixed at a position above the gap 2b and always below the outer peripheral portion of the thread control cam 14.

In addition, according to the above-mentioned embodiment, although the thread capture | acquisition member 20 captures the cut | disconnected end parts L1 and L2 of the looper seal L by the band-shaped raising along the circular arc of the outer peripheral part of the bearing 4, Any structure may be used as long as the thread capturing member can catch the end of the cut thread. For example, the material of the adhesiveness may be sufficient as the surface of a thread capture member.

1 is a perspective view showing the configuration of a thread control device provided in the sewing machine according to the present invention.

2 is an explanatory view showing the positional relationship between the seal guide member and the lower shaft.

3 is a perspective view showing a thread control device when the large diameter portion of the thread control cam is in contact with the looper seal.

Fig. 4 is an explanatory diagram showing a path of the looper seal at the inner edge portion of the long hole of the seal guide member, and Fig. 4 (a) is an explanatory diagram showing the path of the looper seal before passing above the notch. (b) is explanatory drawing which showed the path | route of the looper thread when passing over the notch, and FIG. 4 (c) is explanatory drawing which showed the path | route of the looper thread after passing up the notch.

Fig. 5 is an explanatory diagram showing the displacement of the looper seal when the looper seal is cut, and Fig. 5 (a) is an explanatory diagram showing the instant when the looper seal is cut at the looper side rather than the thread passage portion closer to the looper. Fig. 5 (b) is an explanatory diagram showing the looper seal removed by the thread control cam, and Fig. 5 (c) is an explanatory diagram showing the state in which the looper seal is wound around the shaft portion between two thread control cams.

FIG. 6: is explanatory drawing which showed the path | route of the looper seal with respect to the long hole part of the thread guide member in the case where a looper seal is wound around the axial part between two thread control cams, and FIG. 6 (a) is the installation position of a notch. 6 (b) is an explanatory diagram showing the path of the looper thread stuck to the notch, and FIG. 6 (c) is a looper tensioned in two directions with the notch as the supporting point. It is explanatory drawing which showed the path of a thread.

7 is a perspective view showing a thread control device in which the pivot unit is rotated upward.

Fig. 8 is an explanatory diagram showing a path of the looper seal source side end of the looper seal cut by the notch, and Fig. 8 (a) is an explanatory diagram showing the instant when the looper seal is cut by the notch, and Fig. 8 (b). Is explanatory drawing which showed the looper thread removed by the thread control cam, and FIG. 8 (c) is explanatory drawing which showed the state in which the edge part of the looper thread was captured by the thread capture member.

It is explanatory drawing which showed the structure of the thread control apparatus which concerns on 2nd Embodiment.

It is explanatory drawing which looked at the structure of the seal control apparatus which concerns on 2nd Embodiment from the direction along a lower axis.

It is explanatory drawing which showed the structure which the looper thread wound by the cylindrical part is cut | disconnected by the thread cutting | disconnection scalpel.

It is a side view which shows the structure of the seal guide member in other embodiment.

Fig. 13 is an explanatory view showing a state of a looper seal in a conventional thread control device, in which Fig. 13 (a) shows a state of a looper seal at the time of normal sewing, and Fig. 13 (b) shows the state of the looper seal. It shows the state that the looper thread is wound.

Explanation of symbols on the main parts of the drawings

2: lower shaft 3, 4: bearing

5: thread path part 10: thread control device

11, 12: thread passage part 13, 14: thread control cam

15: seal guide member 16: rotating part

20: thread capture member

Claims (7)

A lower shaft rotating by the rotation of the sewing machine motor, A looper oscillating in conjunction with the rotation of the lower shaft, 2 thread passages, Two thread control cams disposed between the two thread passages and installed on the lower shaft such that a looper thread crossing between the two thread passages is in sliding contact with the outer peripheral portion thereof; and And a thread guide member provided between the two thread control cams, the looper seal being in sliding contact with each of the thread control cams, and having an elongated hole portion for reciprocating the looper seal in a predetermined direction. A thread control apparatus of a round bar sewing machine which applies tension to the looper thread according to a change in diameter of the two thread control cams. And said thread guide member is provided in the middle of an inner edge portion of said lower shaft side in the longitudinal direction of said elongated hole portion to provide a thread cutting means for cutting said looper thread. The method of claim 1, On the looper seal supply source side, it is fixed to the frame at a position between the outer periphery of the seal control cam and the lower axis than the seal control cam on the looper seal source side, so that the end of the looper seal can be captured. Thread control device of a round bar sewing machine characterized in that it comprises a thread capturing member. The method of claim 1, A first cylindrical portion provided on the side of the looper seal supply source side of the thread control cam, and a cutting member disposed near the outer circumferential surface of the first cylindrical portion to enable the looper seal to be cut. Thread control system. The method of claim 3, wherein A round bar sewing machine characterized in that a second cylindrical portion is fixed to the sewing machine frame and inserts a lower shaft therein, and an end portion of the second cylindrical portion is inserted into an end of the end portion located on the looper seal supply source side of the first cylindrical portion. Thread control device. The method of claim 1, The thread cutting means is a thread hook portion for hooking the looper thread in accordance with the change in the diameter accompanying the rotation of the thread control cam and cutting the looper thread in accordance with the change in the diameter. Control unit. The method of claim 5, The thread cutting means is a thread control device of a round bar sewing machine, characterized in that the recess formed in the inner edge portion. The method of claim 5, The thread cutting means is a thread control device of a round bar sewing machine, characterized in that the convex portion formed in the inner edge portion.

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