KR20090019694A - Threaed tension device for sewing machine - Google Patents

Abstract

A device for adjusting thread of a sewing machine is provided to sew soft fabric without a seam fault to the good quality. A device for adjusting thread of a sewing machine includes a main thread controller(4) and an auxiliary thread controller(5). The auxiliary thread controller gives preliminary tension to upper thread which is supplied to the main thread controller of a rotary resistance type. The auxiliary thread controller includes a rotary drum(51), a push spring(53), and an adjustment handle. The rotary drum rotates around an axis. The push spring gives power to the rotary drum. The push spring controls increase and decrease elasticity of the push spring.

Description

Thread adjusting device of sewing machine {THREAED TENSION DEVICE FOR SEWING MACHINE}

The present invention relates to a thread adjusting device which is equipped with a sewing machine and gives tension to an upper thread (bedroom) supplied to a needle, and in particular, a thread adjustment capable of imparting a small tension suitable for sewing a thin cloth or a soft cloth. Regarding the device

In sewing by a sewing machine, it is necessary to give an appropriate tension to the upper thread supplied to the needle and the lower thread supplied to the lower thread winding device such as a bobbin or a looper. In order to realize such tensioning for various sewing machines, It is equipped with an adjusting device.

  Most of the thread adjusting device for applying tension to the upper thread includes a pair of thread adjusting plates and elastic means (spring, solenoid, etc.) for applying elasticity to press them together, and are sandwiched between the thread adjusting plates. When the supported upper thread is pulled out by the operation of the needle and the thread take-up, it is configured to apply tension by frictional resistance applied between the support surface of the thread adjusting dish (for example, See 2003-181182 (hereinafter referred to as "Patent Document 1").

In the thread adjusting device provided with this kind of friction resistance thread adjuster, the tension of the upper thread can be changed large or small by adjusting the elasticity of the elastic means and increasing or decreasing the pressing force of the thread adjusting plate. It is possible to realize tensioning according to sewing conditions such as the hardness and softness of the fabric, and thick and thin.However, when the operation is carried out with a slight tension by reducing the elasticity, the sticking of the thread adjustment plate pushed with a weak force Since it changes due to external factors such as the state, pulling out of the upper thread, and vibration during operation, there is a problem that it is difficult to give stable tension.

A thread adjusting device for a sewing machine that solves this problem and makes it possible to stably apply a small tension has been proposed (see, for example, Japanese Patent Application Laid-open No. Hei 10-211380 (hereinafter referred to as "Patent Document 2"). ). The thread adjusting device is provided with a pair of thread adjusting plates rotating around an axis, and adjusting means for increasing or decreasing their rotational resistance. The upper thread is sandwiched between a pair of thread adjusting plates, wound about 1 turn, and guided by a needle, and the thread adjusting plate rotates as the upper thread is pulled out by the action of the needle and thread take-up. At that time, a tension corresponding to the rotational resistance is applied to the upper thread.

In the thread controller (rotational resistance type thread regulator) having the above configuration, it is possible to adjust the rotational resistance of the thread adjusting plate in a small area, and it is possible to stably apply a small tension to the upper thread. The same tension can be applied when the upper thread supplied upstream to the thread regulator itself has a tension. Therefore, in the thread regulator disclosed in Patent Literature 2, a thread resistance regulator (main thread regulator) of a rotational resistance type is used. Upstream, a sub-chamber regulator is provided for imparting pretension to the upper thread supplied to the main thread regulator.

The sub thread adjuster is a friction resistance thread adjuster that applies a frictional resistance to the upper thread sandwiched between a pair of thread adjusting plates, similarly to the thread adjusting device disclosed in Patent Document 1. As described above, the pretension provided by this thread adjuster becomes unstable in a small area, but it is supplemented by a stable tension applied by a main thread adjuster of a rotational resistance type to sew thin cloth and soft cloth. It is possible to correspond to (for example, refer patent document 1, patent document 2).

In recent years, however, fabrics sewn by sewing machines have been diversified, and using a sewing machine provided with a thread adjusting device disclosed in Patent Document 2, for example, very thin fibers called microfibers are conventionally assumed. In the case of sewing a thin, soft cloth which could not be done, even if sewing was performed under the provision of the minimum adjustable tension, there was a problem that seam defects occurred due to inadequate tension of the upper thread, and it was difficult to secure desired sewing quality. .

4 is an explanatory diagram of a seam failure occurring in a sewing machine.

In the case of sewing by a sewing machine, the upper thread 2a has a swing width to the left and right and a V-shaped seam is formed on the surface of the cloth as shown in the figure. When a thin, soft cloth is sewn in a state where the tension of the upper thread 2a is inappropriate (excessive), the swing of the upper thread 2a, as shown in Fig. 4 (a), is caused by the action of this tension. Between the width | variety, the seam defect in which a cloth swells arcuately occurs. In addition, when the tension balance of the lower thread 2b intertwined with the upper thread 2a on the back side of the fabric is not appropriate, the lower thread 2b is pulled up on the surface of the fabric, and as described above, As shown in Fig. 4 (b), the seam on the surface of the cloth so as to form a “jaw shape” is a bad seam that becomes “shape” by the upper thread 2a and the raised lower thread 2b. Self-contained "occurs.

In the conventional thread adjusting apparatus, the tension applied to the upper thread 2a in the small force region is unstable, and fluctuates due to various external factors during operation, so that it is shown in Figs. 4 (a) and (b). Seam defects such as these occur locally in the longitudinal direction of the seam, resulting in worsening the quality of the seal.

The present invention has been devised in view of such circumstances, and it is possible to stably apply a small tension to the upper thread supplied to the needle, and to sew thin cloth and soft cloth with good quality without causing seam defects. An object of the present invention is to provide a thread adjusting device for a sewing machine.

The thread adjusting device of the sewing machine according to the first aspect of the present invention rotates by interposing an upper thread between a pair of thread adjusting plates, and gives the upper thread a tension corresponding to the rotational resistance of the thread adjusting plate. A thread adjusting device for a sewing machine comprising: a main thread adjusting device, and a sub thread adjusting device for imparting a pretension to the upper thread supplied to the main thread adjusting device, in the middle of the path of the upper thread from the thread supply source to the thread take-up. A thread adjuster is wound around the upper thread a plurality of times at intervals in the width direction of the outer circumference and rotates about an axis to increase and decrease the rotational resistance of the rotating drum to adjust the pretension. It characterized in that it comprises a control means to.

In the present invention, the subsidiary thread regulator for providing a pretension to the upper thread supplied to the main thread regulator is provided with a rotating drum for rotating around the axis, and an adjusting means for increasing or decreasing the rotational resistance of the rotating drum. . The upper thread supplied from the thread supply source is spaced apart in the width direction on the outer periphery of the rotating drum, and is wound and held multiple times without overlapping each other, and each one-part portion is accompanied by the rotation of the rotating drum. The micro tension is generated by the pulling of. This tension can be adjusted large or small by increasing or decreasing the rotational resistance of the rotating drum, and it is possible to supply the upper thread to which the small pretension is stably provided to the main thread controller.

The thread adjusting device of the sewing machine according to the second invention of the present invention is provided around the rotary drum, and each of the plurality of guide grooves arranged in the width direction of the rotary drum is connected to the rotary drum (once It is characterized in that it comprises a thread length member for guiding the upper thread hanged every time, in the width direction of the rotary drum.

In the present invention, a threading member having a plurality of guide grooves is provided around the rotating drum, and the upper thread which is wound around the rotating drum and held on the guide groove of the threading member is wound around the rotating drum once. This ensures stable spacing in the width direction between the upper threads of the main column of the rotating drum.

Thread adjusting apparatus for a sewing machine according to a third aspect of the present invention, the circumferential length of the upper thread that the plurality of guide grooves of the thread member is wound on the rotating drum, respectively, the thread supply source It characterized in that it is installed to be sequentially shortened in order from the main thread regulator from.

In the present invention, the circumferential length of the upper thread which causes the plurality of guide grooves of the thread member to be wound on the rotating drum by walking on each of them is long, and the final winding of the main thread regulator side is long. It is installed so as to be sequentially shortened toward each other, and stable tension is generated by the pulling of each one-part portion. The difference in the circumference of the upper thread can be realized by forming guide grooves having different depths in the thread member extending along the width direction of the rotating drum. It is also possible to implement | achieve the thread body so that the separation distance of the outer periphery of a rotating drum may differ.

In the thread adjusting device of the sewing machine according to the fourth aspect of the present invention, the thread length member is provided to extend in the width direction of the rotating drum, and the plurality of guide grooves are different from one of the width directions of the rotating drum. It is characterized by being installed in order to change the depth toward the side sequentially.

In the present invention, the plurality of guide grooves are installed in such a manner that the depths of the rotating drums are sequentially changed from one side in the width direction of the rotary drum to the other, so that the upper thread wound on the rotating drum is held in the guide groove of the member to be loaded. By hanging every time (when we wind), we produce difference of one week length of upper thread.

The thread adjusting device of the sewing machine according to the fifth aspect of the present invention is characterized in that the plurality of guide grooves are provided so as to be deepened toward the end where the thread length member is extended.

In the present invention, since the plurality of guide grooves are deepened toward the end where the thread member is extended by being installed, a difference occurs that the circumferential length of the upper thread is sequentially shortened toward the end where the thread member is extended by being installed.

Thread adjusting apparatus of the sewing machine according to the sixth invention of the present invention,

A support shaft for supporting the rotating drum, an adjustment knob screwed to an end of the support shaft, a pressing plate positioned between the rotating drum and the adjusting knob, and providing a rotational resistance to the rotating drum; Located between the adjustment knobs, characterized in that it has a pressing spring for pushing the pressing plate to the rotary drum.

In the present invention, it is possible to adjust the elastic force of the push spring to adjust the rotational resistance imparted to the rotating drum through the presser plate by turning the adjusting knob forward or backward.

Thread adjusting apparatus of the sewing machine according to the seventh invention of the present invention,

It is characterized by including a rolling bearing located between the press plates.

In the present invention, for example, the contact area between the rolling bearing and the rotating drum is reduced, thereby reducing their frictional resistance. Thereby, the adjustment of the rotational resistance of the rotating drum by the operation of the adjusting knob can be performed stably in a small area.

In the thread adjusting apparatus of the sewing machine according to the present invention, a sub-thread adjuster for providing a pretension to the upper thread supplied to the main thread adjuster, a rotating drum for holding the upper thread wound a plurality of times at intervals from each other, and Since the rotation resistance of the main thread regulator of the same rotational resistance type is provided because it is provided with a rotation resistance type thread adjuster capable of applying tension to the upper thread drawn from the thread supply source by adjusting means for increasing or decreasing the rotational resistance of the rotating drum. By the action of the phase, it is possible to stably apply a small tension to the upper thread supplied to the needle through the thread take-up, and to make it possible to sew thin and soft cloths well without causing seam defects. The present invention brings about an excellent effect.

As mentioned above, embodiment described in the column of detailed description of an invention is intended to make clear the technical content of this invention to the last, and this invention is limited to only such a specific example and is not interpreted by consultation. It is possible to carry out various modifications within the spirit and scope of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail based on drawing which shows embodiment. 1 is an external perspective view of a sewing machine for sewing machine provided with a thread adjusting device according to the present invention.

The cross-stitch sewing machine 1, as shown in the figure, is a sewing machine bed 10, a leg column 11 extending so as to be substantially perpendicular from an upper surface of one side (right side) of the sewing machine bed 10, and this leg column 11 The base is spoken at the upper end of the), and is provided with a sewing machine arm 12 extending along the upper surface of the sewing machine bed 10 in a different direction (left side). On the tip end (left end) of the sewing machine arm 12, the needle bar 14 is supported by hanging toward the needle plate 13 located on the top end (left end) of the sewing machine bed 10 facing downward. The needle 15 is attached to the lower end of the needle bar 14.

The needle bar 14 is connected to a needle bar drive mechanism (not shown) provided inside the sewing machine arm 12. The needle bar 14 is stroked with a needle 15 attached to the lower end by the operation of the needle bar drive mechanism. ) Is configured to achieve up and down motion. The upper and lower movements of the needle 15 alternately occur in two places with a proper swing width to the left and right, and the upper thread 2 and the needle plate 13 which are thread-wound by this vertical movement are shown. By the bobbin thread wound by the bobbin which is not made, it is possible to form the seam of a creeper on the cloth which is not shown sent to the needle board 13.

The thread adjusting device 3 is installed on the front side of the sewing machine arm 12. The thread adjusting device 3 includes a main thread adjuster 4 positioned at the front end side of the sewing machine arm 12 and an auxiliary thread located closer to the base end of the sewing machine arm 12 than the main thread adjuster 4. The regulator 5 is provided. On the front side of the sewing machine arm 12, the thread hanger 16 and the thread holder 17 are attached to the front end side of the main thread adjuster 4, and on the upper surface of the sewing machine arm 12, the sub thread adjuster 5 The thread holder 18 is mounted at the upper position of. At the distal end of the sewing machine arm 12, a thread take-up chamber 61 (see Fig. 2), which is opened and closed freely by a circular cover plate 60, is provided.

The upper thread 2 supplied to the needle 15 is guided to the sub thread adjuster 5 via the thread catch 18, as indicated by the dashed-dotted line in FIG. 1, and described later from the sub thread adjuster 5. Derived as leading to the main thread adjuster (4), and also derived from the main thread adjuster (4) as described later, introduced into the thread take-up chamber 61 via the thread hanger 16 and the thread holder 17 It pulls out from this thread take-up chamber 61 to the downward direction, and is set to the needle 15. As shown in FIG.

2 is an explanatory diagram of a path of the upper thread 2 from the sub thread adjuster 5 to the needle 15. In this figure, the inside of the thread take-up chamber 61 provided in the front-end | tip part of the sewing machine arm 12 is shown. The thread take-up chamber 61 is a space of a circular cross section in which the tip end portion of the sewing machine arm 12 is recessed, and the inside of the thread take-up chamber 61 is arranged around the central axis in the direction indicated by the arrow in the middle. Rotating thread take-up 6 is located.

The upper thread 2 derived from the main thread adjuster 4 is changed in direction by walking on the thread hanger 16 and guided to the distal end of the sewing machine arm 12 through the groove-shaped thread catch 17, and the thread take-up chamber The inside of the 61 is introduced through the introduction hole 62 provided in the front lower side of the main wall of this thread take-up chamber 61. The upper thread 2 introduced into the thread take-up chamber 61 changes direction by walking to the thread take-up thread 6 that rotates as described above, and is external to the thread take-up chamber 61 as described above. It is pulled out through the extraction hole 63 provided in the lower side of the main wall, and is set to the needle 15 attached to the lower end of the needle bar 14.

Rotation of the thread take-up 6 occurs in synchronization with the vertical movement of the needle bar 14 and the needle 15. The thread take-up 6 which rotates in this way pulls up the upper thread 2, when it exists in the rotation position shown in FIG. 2, and repeats the action which loosens the upper thread 2 pulled up by subsequent rotation. The upper thread 2 is pulled up to draw the upper thread 2 upstream by the length necessary for forming the seam, and the action of loosening the upper thread 2 is released by the lowering of the needle 15. The upper thread 2 which falls is made so that the length which can be caught by the bobbin located in the lower part of the needle board 13 is performed. The upper thread 2 caught by the bobbin is pulled up again by the rotation of the thread take-up 6, and is tightened by the thread adjusting device 3 under tension given as follows.

The main thread adjuster 4 of the thread adjusting device 3 is provided with a pair of thread adjusting plates 40 and 40 which rotate about an axis, and an adjusting means for increasing or decreasing their rotational resistance. It is a rotary resistance type regulator of. The thread adjustment plates 40 and 40 are supported so as to be freely rotated around the support shaft 42 provided to protrude from the base 41 fixed to the sewing machine arm 12. The support shaft 42 extends a proper length from the supporting portion of the thread adjusting plate 40, 40, and is inserted between the adjusting knob 43 and the thread adjusting plate 40, 40 supported by being screwed into the extended end. The push spring 44 constructed by using the coil spring is installed in the valve.

The upper thread 2 is sandwiched and supported between the opposing surfaces of the pair of thread adjusting plates 40 and 40, and is pulled out by winding about one revolution. The upper thread 2 wound in this way is pulled out to the lead-out side by the rotation of the thread adjusting dish 40 and 40 by the rotation of the thread take-up 6, and the upper thread 2 is attached to the upper thread 2 at this time. Tension according to the rotational resistance of 40, 40 is given. The rotational resistance of the thread adjustment plates 40 and 40 can be increased or decreased by rotating the adjustment knob 43 and changing the spring force of the push spring 44 to the strength and weakness. It is possible to change the applied tension to large and small.

As described above, when the tension is applied by the main thread adjuster 4, the upper thread 2 upstream of the main thread adjuster 4, that is, the upper thread 2 supplied to the main thread adjuster 4 has tension. Only realized. The sub thread adjuster 5 of the thread adjusting device 3 is provided to impart tension (preliminary tension) to the upper thread 2 supplied to the main thread adjuster 4, and a feature of the present invention is a sub thread adjuster. It is in the structure of (5).

3 is an exploded perspective view of the silo regulator 5. The subsidiary regulator 5 includes a rotating drum 51 supported on the substrate 50 so as to be freely rotated, and an adjusting means (adjusting knob 52 and push) for increasing or decreasing the rotational resistance of the rotating drum 51. Spring 53).

The board | substrate 50 has the support shaft 54 installed so that it may be perpendicular to the substantially center of one surface. The rotating drum 51 is a disk of appropriate thickness formed by providing winding portions of appropriate width between the edges of the visor on both sides, and is supported by being engaged with the base of the support shaft 54 with the radial bearing 55 therebetween. . The distal end of the support shaft 54 is separated by a dividing bone passing through the shaft core, and is a screw shaft 56 having male threads formed on the outer circumference. The adjusting knob 52 is a disk-shaped nut which cuts out the inside of which a female thread is formed in the inner circumference of a hole penetrating the shaft core, and is fitted to the screw shaft 56 at the tip of the support shaft 54. .

The thrust bearing 57 and the presser plate 58 are inserted in the intermediate | middle part of the support shaft 54 so that the press plate 58 may have the clearance, and the presser plate 58 may rotate the drum 51 with the thrust bearing 57 in between. It is in contact with the cross section of. The pressing spring 53 is positioned between the adjustment knob 52 and the pressing plate 58 to elastically contact each of the opposing surfaces, and the pressing plate 58 between the pressing drums 58 at the end face of the rotating drum 51. It is comprised so that the thrust bearing 57 may be stuck. This pressing force is increased by rotating the adjusting knob 52 and spirally advancing along the screw shaft 56 to shorten the pressing spring 53.

By the above structure, the rotating drum 51 rotates around the support shaft 54 supported with the radial bearing 55 interposed. At this time, the rotary drum 51 has a rotational resistance of the radial bearing 55 positioned between the support shaft 54 and a rotational resistance of the thrust bearing 57 pushed through the pressing plate 58 therebetween. This works. Among these, the rotational resistance by the thrust bearing ring 57 can be adjusted by rotating operation of the adjustment knob 52, and increasing or decreasing the pressing force by the push spring 53. As shown in FIG.

As shown in the figure, the thrust bearing 57 is composed of a rolling bearing formed by holding a needle roller in each of a plurality of holes provided radially in a disc-shaped retainer. The rotating drum 51 can rotate smoothly without being impeded by the pressing force of the pressing spring 53 applied with the pressing plate 58 interposed therebetween, and the rotating drum 51 by the operation of the adjusting knob 52. The rotational resistance can be adjusted stably in a small area.

The radial bearing 55 in Fig. 3 is illustrated as a cylindrical rolling bearing, but it is possible to use a rolling bearing made of a needle roller of the same type as the thrust bearing 57, whereby a rotating drum ( The rotation of 51 is also smoothed.

The board | substrate 50 which supports the rotating drum 51 extends outward rather than the outer periphery of the rotating drum 51, and this extended part is provided with two thread | strength members 7 which extend at substantially right angles. have. The seal member 7 shown in FIG. 7 is formed by bending a part of the substrate 50, and is provided as an integral member of the substrate 50. However, the seal member 7 may be formed separately from the substrate 50. There is no need.

A thread hole 70 for passing the upper thread 2 through is formed in one thread length member 7 at a position away from one surface of the substrate 50. On the other hand, as shown in FIG. 2, as shown in FIG. 2, it extends to the height exceeding the full width of the rotating drum 51 supported as mentioned above with respect to the board | substrate 50. As shown in FIG. In this thread member, a plurality of guide grooves 8a-8d arranged at a predetermined interval within the width region of the rotating drum 51 are formed as shown in Fig. 3. have. These guide grooves 8a-8d have different depths, and are directed from the guide groove 8a located near the substrate 50 to the guide groove 8d located away from the substrate 50. It is formed to deepen sequentially.

The upper thread 2 is set in the silo regulator 5 configured as described above as shown in FIG. The upper thread 2 guided to the sub thread adjuster 5 from the thread supply source (not shown) through the thread catcher 18 described above passes through the thread hole 70 of the thread length member 7, and then rotates the rotating drum ( It is wound as a plurality of times around the outer periphery of 51) and drawn downward, and is set as described above in the main thread adjuster 4.

As shown in Fig. 2, the upper thread 2 is wound on the guide drum 8a-8d provided in the thread member as shown in FIG. Lose. As described above, the guide grooves 8a-8d are provided side by side with a gap in the height direction of the thread member, that is, in the width direction of the rotary drum 51, and the guide grooves 8a-8d thereof. The upper thread 2 wound around the rotating drum 51 while being hooked on is rotated a plurality of times (4 times) without being overlapped with a predetermined interval in the width direction on the outer circumference of the rotating drum 51.

Further, the guide grooves 8a-8d of the thread member are formed to be deeper in the order of the guide grooves 8a, 8b, 8c, and 8d as they are separated from the substrate 50 as described above. The upper thread 2 wound around the rotating drum 51 while being fitted into these guide grooves 8a-8d has a long supply side from the thread supply source, and is sequentially directed toward the lead side to the main thread regulator 4. It will have a length of one week. In addition, in FIG. 2, the reference numeral 70 of the thread hole and the reference numerals 8a to 8d of the guide grooves are omitted in order to prevent the complexity of the drawing.

In this way, the upper thread 2 set in the subsidiary thread regulator 5 is pulled out to the lead-out side according to the rotation of the rotary drum 51. At this time, the upper thread 2 wound around the outer circumference of the rotating drum 51 without being overlapped with each other is tightened on each round part, and tension is generated by engaging the round parts. In addition, since the upper thread 2 wound around the rotating drum 51 has a one-week length that is sequentially shortened toward the pulling-out side as described above, the tightening on each one-round part is satisfactory. It is possible to generate stable tension.

As described above, the subsidiary thread regulator 5 functions to generate a pretension to the upper thread 2 that does not have a tension supplied from the thread supply source, and supply the pre-tension to the main thread regulator 4. The magnitude of the pretension applied to the upper thread 2 by the sub thread adjuster 5 is, as described above, the tension generated by the engagement of the circumferential parts of the rotating drum 51 and the rotating drum ( It corresponds to the force of the minute rotational resistance of 51). Among them, since the rotational resistance of the rotating drum 51 can be increased or decreased by the operation of the adjusting knob 52 as described above, the silo regulator 5 is adjustable in a small force region. It is possible to stably provide reserve tension.

Therefore, under the provision of the preliminary tension as described above, the tension of the upper thread 2 supplied to the needle 15 via the thread take-up 6 to the microscopic force region by the operation of the main thread adjuster 4 described above. It becomes possible to give stably at, and it is possible to sew thin cloths and soft cloths, including the cloth using a microfiber, and to sew well without generating the seam defect as shown in FIG.

In the above embodiment, the number of windings of the upper thread 2 on the outer circumference of the rotary drum 51 is four times, but the upper thread 2 is spaced apart in the width direction so as not to overlap each other. You may wind up more than once (two times or more) at the bottom.

Moreover, in the above embodiment, in order to change the circumferential length of the upper thread 2, the depth different from the thread length member which extends along the direction orthogonal to the board | substrate 50, ie, the width direction of the rotating drum 51, Guide grooves (8a-8d) having a, and the upper thread (2) is fitted to them, but, for example, a threaded member formed with guide grooves (8a-8d) having the same depth, rotating drum It is installed so that the distance from the outer periphery of the 51 is small toward the tip side, and each time the upper thread 2 is wound, it is inserted into the guide groove 8a-8d so as to be wound around the rotating drum 51. It is also possible to realize by different structures, such as realizing the difference of length.

Moreover, in the above embodiment, although the application example to the crumb sewing machine was demonstrated, it cannot be overemphasized that this invention is not limited to a crumb sewing machine and is applicable to the whole sewing machine which requires a micro tension application.

Figure 1 is an external perspective view of a sewing machine sewing machine equipped with a thread adjusting device according to the present invention.

2 is an explanatory view of the path of the upper thread from the sub-thread regulator to the needle.

3 is an exploded perspective view of the silo regulator.

Fig. 4 is an explanatory diagram of seam defects occurring in a new sewing machine.

* Description of the sign *

2 thread

4 weeks thread regulator

5 thread adjuster

6

8 thread length member

15 needles

50 substrate

51 rotating drum

52 adjustable handle

53 Push spring

8a ~ 8d Home

Claims (7)

A main thread controller which rotates by inserting an upper thread between a pair of thread adjusting plates, and imparts a tension corresponding to the rotation resistance of the thread adjusting plate to the upper thread, and a spare thread supplied to the main thread controller. In the thread adjusting device for a sewing machine, a thread adjusting device for providing a tension is provided in the middle of a path of an upper thread from a thread supply source to a thread take-up. The sub thread adjuster, the upper drum is wound around a plurality of times at intervals in the width direction of the outer periphery, rotating drum rotating around the axis, Thread adjusting device for a sewing machine, characterized in that it comprises a control means for adjusting the pre-tension by increasing or decreasing the rotational resistance of the rotary drum. The method of claim 1, It is provided around the rotating drum, and each of the plurality of guide grooves arranged in the width direction of the rotating drum, the upper thread hanged every time the winding drum is wound, the space in the width direction of the rotating drum Thread adjusting device of a sewing machine, characterized in that it comprises a thread length member for inducing spacing. The method of claim 2, A plurality of guide grooves of the thread member, the circumferential length of the upper thread to be wound on the rotating drum, respectively, is installed so as to shorten sequentially in the order of the main thread regulator from the thread supply source Thread control device. The method of claim 3, The thread member is installed to extend in the width direction of the rotating drum, the plurality of guide grooves, the thread adjusting device of the sewing machine is installed by changing the depth sequentially from one side in the width direction of the rotating drum toward the other side . The method of claim 4, wherein The plurality of guide grooves, the thread adjusting device of the sewing machine is installed so as to deepen toward the end installed by extending the thread length member. The method of claim 1, The adjusting means includes a support shaft for supporting the rotating drum, an adjustment knob screwed to an end of the support shaft, and a pressing plate positioned between the rotating drum and the adjusting knob to impart rotational resistance to the rotating drum. And a pressing spring that is positioned between the pressing plate and the adjusting knob and pushes the pressing plate to the rotary drum. The method of claim 6, Thread adjusting device of the sewing machine having a rolling bearing located between the rotary drum and the pressing plate.

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