KR20000065977A - Automatic dual bobbin mechanism - Google Patents

Abstract

PURPOSE: An automatic dual bobbin mechanism is provided to easily cut thread between a bobbin at rewinding position and another bobbin at a sewing position. CONSTITUTION: A desired sewing pattern is set up by catching needle thread in a rotary housing(1) and catching bobbin thread of a bobbin(11) at a sewing position by a hook by turning around a bobbin casing(31). The thread wound on the bobbin at the sewing position is determined by a manual digital counter sensing the rotational frequency of the bobbin or a computerized monitor. If the thread is consumed completely, a needle stops and the bobbin stops rotating. While stitching by the thread, another bobbin(21) at rewinding position rotates at speed the same as that of the bobbin at sewing position by a bobbin drive shaft(70). During rotation, thread is supplied continuously from a thread supply unit and wound on the bobbin at rewinding position.

Description

Automatic dual bobbin mechanism

The present invention relates to a bobbin structure for a sewing machine, and more particularly, to an automatic double bobbin mechanism.

Sewing machines use two threads to properly connect two fabrics. That is, one is a thread inserted in a needle, and the other is supplied from a bobbin (failure, hereinafter referred to as bobbin), which is a second thread supply source.

The bobbin, however, has a significant limitation on the amount of thread wound, and should be replaced frequently. That is, when the bobbin thread is used up, the sewing machine user stops sewing and manually takes out the empty bobbin and replaces it with the bobbin with the thread wound on it, and then hooks the needle on the hook and the needle again to stitch. Restart).

This bobbin replacement is not only a waste of time, but sometimes a cause of deterioration of clothing or damage to the joints. Therefore, in order to reduce the 'delayed time' during sewing work, the need for a bobbin mechanism capable of supplying more yarn or continuous bobbin replacement was highlighted.

In order to answer this request, US Pat. No. 4,002,130 to Robin et al. Proposes a mechanism for automatically rewinding bobbins. However, this patent discloses an actuator, cam, gear drive, etc. to move the bobbin from the rewind position to the sewing position. The same various technical elements are required, and in order to have all of these elements, there is a disadvantage in that a large structure must be established in the existing sewing machine.

In addition, US Pat. No. 5,143,004 to Maldix et al., US Pat. No. 4,681,050 to Kosmas and the like have been proposed.

However, despite the development of the technique of rewinding and replacing the bobbin as described above, it would be desirable to avoid bulky structures attached to existing sewing machines, rethreading on hooks, or taking the additional steps of rewinding the bobbin. In order to perform a continuous and continuous operation, there is still a need for an improved device for detecting the loss of consumption and replacing the bobbin.

Thus proposed by the inventor of this application is US Patent No. 5,622,127. In this patent, two bobbins facing each other are located in a housing, while a thread is wound around the other second bobbin while the first bobbin is used, and when the threads are exhausted from the first bobbin, the second bobbin is rotated 180 °. It suggests that the thread wound on the bobbin can be used continuously.

However, in this patent there is no means for adjusting the tension of the thread supplied in the bobbin, and it is also connected to each other by a male and a female so that the first bobbin and the second bobbin rotate. There is a problem that the thread is configured to pass therebetween, so that the thread is broken between the protruding protrusion and the recessed portion, or the thread is heavily loaded.

In addition, the thread hanging on the teeth formed on the bobbin is to be broken by the tension, but because it depends only on the tension does not break well, there is a disadvantage in the operation occurs.

In addition, there is a disadvantage in that the fixing means is adopted separately from the member that is usually used to fix the bobbin casing of the sewing position.

In addition, there is a disadvantage that the bobbin casing does not rotate stably when rotating.

Accordingly, the present invention has been made to overcome the problems of the prior art as described above, and the object of the present invention is to provide an automatic double bobbin mechanism that is practically applicable while accepting the US patent by the present inventors as a basic concept of the present invention.

That is, an object of the present invention is to provide an automatic double bobbin mechanism that allows the supply chamber to be disconnected well between the bobbin at the rewinding position and the bobbin at the sewing position.

It is another object of the present invention to provide an automatic double bobbin mechanism that can ensure stable rotation when the bobbin casing rotates.

Another object of the present invention to provide a double bobbin mechanism that can adjust the tension of the supply chamber.

1 is an exploded perspective view of the bobbin mechanism according to the present invention

2A and 2B are views of the bobbin casing according to the present invention, respectively, from different directions.

3 is an operation diagram showing a process of releasing the fixing of each bobbin casing in accordance with the present invention.

4 is a view showing a state in which the bobbin in the rewind position is fitted to the cover and the drive shaft of the bobbin casing.

Figure 5A is a perspective view showing the shape of the cutting tool fitted to the teeth of the bobbin according to the present invention.

5B is a perspective view showing a state in which the cutting tool of FIG. 5A is fitted to the teeth of the bobbin.

6A, 6B, and 6C are schematic plan views, respectively, as viewed from above while the bobbin casing rotates;

(Short description of symbols for main parts of drawing)

1: housing 11, 21: bobbin

31, 41: bobbin casing 50: bobbin casing mount

90: pivot coupler

In order to achieve the above object, the present invention has its first feature in that two bobbins are rotated independently. In the present invention, the two bobbins are not in contact with each other, the bobbin in the rewind position is to be rotated by a separate drive means.

A second feature of the present invention is to be able to adjust the tension of the thread supplied from the bobbin. To this end, the present invention provides a tension adjusting means in the bobbin casing.

A third feature of the invention is the provision of a bobbin casing mount which allows the bobbin casing to be stably supported in the housing. The bobbin casing rests on the mount and rotates 180 ° in the housing. As the mount rotates, the drive means of the rewind bobbin and the bobbin casing are released.

The present invention having the above characteristics includes two bobbins each positioned at a first position defined as a sewing position and a second position defined as a rewinding position; Two bobbin casings for accommodating each bobbin and having a hole formed at a position coinciding with the rotation center of the bobbin therein, and a through hole through which the supplied thread passes and the needle is operated; Rotating means for changing the position by rotating the two bobbin casings by 180 °; It provides an automatic double bobbin mechanism including a bobbin driving unit for rotating the bobbin positioned in the second position.

In the present invention, the bobbin casing preferably further includes a supply chamber tension adjusting means.

Preferably, the tension adjusting means includes a gap formed between the spring member mounted in the through hole to which the supply chamber of the bobbin is supplied, and a screw for adjusting the gap of the gap.

The invention further comprises a bobbin casing mount, the bobbin casing mount being rotated 180 ° by the rotating means inside the housing.

In the present invention, a tooth is formed on at least one outer periphery of each bobbin, and a thread cutting tool is attached to the tooth of each bobbin.

Thread bobbins are formed in each bobbin casing, and when the bobbin positions are changed, the bobbin thread moves from the bobbin wound to the empty bobbin through the grooves. At this time, the transfer member near the empty bobbin catches the thread and the thread is cut by a thread cutting tool mounted on the teeth of the bobbin.

Other features and objects of the present invention will be apparent from the embodiments described below.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is an exploded perspective view to easily decompose the bobbin mechanism according to the present invention. As shown, in the embodiment of the present invention is composed of two bobbin (11, 21), the bobbin of the left side of the drawing of the bobbin is called the bobbin 11 of the sewing position, the right bobbin of the rewinding position The bobbin 21 is called. These bobbins are accommodated in the bobbin casings 31 and 41 by covers 13 and 23, and the bobbin casings 31 and 41 are hemispherical or dish-shaped.

Each bobbin casing 31 and 41 is mounted to a bobbin casing mount (hereinafter referred to as a mount) 50, and for this purpose, the mounting portion of the mount 50 is an edge formed on the bobbin casing 31 and 41. It is rounded along the shape of (32) (42). A protrusion 51 is formed at the upper end of the mount, and the protrusion 51 is for seating the mount on the circular groove 2 formed in the housing 1, and the mount 50 is formed of the housing 1. It is possible to rotate 180 ° along the circular groove 2.

Meanwhile, two fixing grooves are formed in each bobbin casing 31 and 41, and the first fixing grooves 33 and 43 are rotated according to the rotation of the bobbin in which the bobbin casing 41 in the rewinding position is accommodated. In order to prevent the rotation together, the second fixing grooves 34 and 44 are for preventing the rotation of the bobbin casing 31 in the sewing position. In order to prevent rotation of the bobbin casing 41 in the rewinding position, a fixing protrusion 63 suitable for the position and shape of the first fixing groove 43 of the bobbin casing 41 may protrude into the housing 1. It is supposed to be. Although shown in the shape of a butterfly in this embodiment is not limited to the shape, of course. The fixing protrusion 63 is formed at the end of the first operating member 60. Since the first fixing groove 43 is for fixing the hemispherical bobbin casing 41, the first fixing groove 43 is preferably positioned at the center of the bobbin casing 41.

On the other hand, the bobbin 21 of the rewinding position is rotated independently, and the bobbin drive shaft 70 is located at the rotary shaft 22 position of the bobbin for this rotation. Since the bobbin 21 is positioned in the middle of the bobbin casing 41, the drive shaft 70 passes through the center of the bobbin casing 41.

That is, the bobbin 21 in the rewind position is rotated while being supported by the shaft 24 formed on the cover 23 and the drive shaft 70. Therefore, as shown, it also penetrates the bobbin fixing protrusion 63 located in the middle of the bobbin casing. The drive shaft 70 may have a circular cross section or may be a polygon such as a quadrangle.

The second fixing grooves 34 and 44 of the bobbin casings 31 and 41 are connected to the second operating member 80 having the fixing protrusion 84 corresponding to the position and shape of the second fixing groove at the sewing position. Is fixed by. This actuating member is of the same shape as that used to fix the bobbin casing in one conventional bobbin mechanism.

And the rotation of the mount 50 is made by a pivot coupler 90 located below this mechanism, two pivots 92 are formed in the pivot coupler 90 corresponding to the two corresponding to the mount 50 It will fit in the hole 52. This pivot coupler will be explained again when explaining the operating relationship.

In addition, although not shown in the drawings, there is a drive shaft for driving the housing 1, and this drive shaft is rotated about 7000 times per minute, for example, this configuration is a conventional one, so a detailed description thereof will be omitted. In addition, the housing is different from the housing 1 of this embodiment in that it has a shape of a housing which is commonly used, or a structure in which the mount can be detached.

FIG. 2A is a view showing the structure of the bobbin casing in a direction in which the first fixing groove is located. The two bobbin casings have the same shape and will be described based on the bobbin casing 41 at the rewind position.

The second fixing groove 44 is positioned in the upper portion of the first fixing groove 43 of the bobbin casing 41, the thread is supplied in the upper portion of the second fixing groove 44, and the needle supply hole (the needle operates) 45 is formed, which is supplied to the supply chamber through the thread supply pipe 95 (see FIG. 1).

The bobbin casing 41 is further provided with a thread moving groove 46 communicating with the thread supply hole 45 at an upper portion of the thread supply hole 45, and on one side of the thread supply hole 45. The arrowhead-shaped spring 47 is located. The arrowhead shape means the inclination part 47a) and the step part 47b, and it is called a spring, but this means adjusting the tension, which is different from the conventional meaning of the spring with the restoring force.

The position of the spring 47 is at a position opposite to the direction of rotation about the seal supply hole 45, that is, when the groove 46 on the upper side moves to the right side of the drawing, the spring 47 is on the upper side. It is located at. The thread supplied through the thread supply hole 45 is wound around one side of the bobbin 21 as the diameter of the bobbin 21 is gradually increased, and moves along the inclined portion 47a of the spring 47, and the position is caught by the step portion 47b. It is fixed so that the thread is continuously supplied.

On the other hand, the spring 47 is mounted by screws 48 and 49, one of the screws 48 and 49 is for mounting, and one of the springs 47 and the bobbin casing 41 is used. This is to control the gap. That is, by adjusting the screws 48, 49, it is possible to adjust the tension of the supplied thread, which allows the user to adjust according to the thickness of the thread, the type of stitching.

FIG. 2B is a view viewed from the opposite direction of FIG. 2A and shows that the back surface of the bobbin casing 41 is blocked by the cover 23 to accommodate the bobbin not shown therein.

3 is a schematic perspective view for explaining a mechanism for separating the first and second operating members 60 and 80 and the bobbin driving shaft 70 and the like from the bobbin casing to fix each bobbin casing when the mount is rotated.

As shown, the first actuating member 60 and the bobbin drive shaft 70 are integrally connected to the release member 75, and the release member 75 and the second actuating member 80 are directed toward the bobbin casing. Each is connected by links 82 and 84. The ends of the links 82 and 84 are brought into contact with each other. When the ends of the links are pushed toward the bobbin casings 31 and 41, the links 82 and 84 are pushed and the release member 75 and the second end are pushed. The distance d of the operating member 80 is long, so that the fixing of each bobbin casing 31 and 41 is released.

Meanwhile, the release member 75 is mounted by the return spring 94 so that the position can be restored, and when the force pushing the links 82 and 84 is released, the release member 75 returns to fix the bobbin casing.

4 illustrates that the cross section of the shape of the drive shaft 70 fitted to the bobbin is rectangular. A drive shaft having a polygonal cross section is advantageous for rotating the bobbin.

The bobbin is supported by the protrusion 24 of the cover while being rotated on the drive shaft.

5A shows the shape of the cutting tool 17 fitted to the teeth 15 formed in the bobbin 11, and FIG. 5B shows the cutting tool 17 fitted to the teeth 15 of the bobbin 11. As shown in the figure, the cutting tool is made by folding as shown by the leaf spring member. That is, one leaf spring member is divided into two portions 18 and 19 around the bent portion 17a, and the inclined portion 17b inclined downward from the top to one portion 18 near the bent portion 17a. ) Is bent toward the other portion 19, and a fixing portion 17c for fixing the cutting tool 17 is formed at a position corresponding to the inlet side of the tooth 15.

Accordingly, when the thread fitted to the teeth 15 of the bobbin 11 is applied downward, the thread is fitted to the bent portion 17a, and one side is cut along the inclined portion 17b.

The operation relationship of the bobbin mechanism of the present embodiment having the configuration as described above will be described below.

The sewing operation is carried out in a general manner, the needle thread is caught in the rotating housing (1), the bobbin thread of the sewing position of the bobbin (11) by the hook created by turning the bobbin casing 31 of the sewing position is desired Complete the sewing pattern. The thread wound on the bobbin 11 at the sewing position is predetermined by a manual digital counter or computerized monitor for detecting the rotation speed of the bobbin 11, and the thread wound on the bobbin 11 at the sewing position after reaching this rotation speed. When this is exhausted, the needle stops and thus stops the rotation of the bobbin 11.

On the other hand, while the thread wound on the bobbin 11 of the sewing position is stitched, the bobbin 21 of the rewinding position is rotated by the bobbin drive shaft 70 at the same rotational speed as the bobbin 11 of the sewing position. During rotation, the thread is wound onto the bobbin 21 in the rewind position.

When the rotation of the bobbin 11 is stopped by reaching the predetermined number of rotations at the sewing position, the pivot coupler 90 positioned below the bobbin casing mount 50 is raised to raise two rods 92 of the pivot coupler 90. Is fitted through the hole 52 formed in the mount 50.

At this time, as shown in FIG. 3, the first and second operating members 60 and 80 are separated from the bobbin casings 31 and 41 to smoothly rotate the bobbin casing.

Preferably this pivot coupler 90 is connected to a solenoid, the solenoid rotates the bobbin casing by receiving an electrical signal from a conventional sewing machine. The pivot coupler 90 may be operated by other means, as well as electromagnetic or electromechanical means.

When the pivot coupler 90 reaches the value set in the digital counter or when the first and second operating members 60 and 80 are separated, the pivot coupler 90 triggers a mechanism for rotating the mount 50.

6A, 6B, and 6C schematically show the above observation of the process in which the supply chamber is moved and cut while the two bobbin casings rotate, and will be described with reference to the various elements shown in FIG. 6A shows a state in which the thread of the bobbin 11 in the sewing position is operated, and at the same time, the supply chamber 100 is wound on the bobbin 21 in the rewinding position, and is supplied to the bobbin 21 in the rewinding position. The supply chamber 100 is transferred from the thread supply pipe 95 and wound around the bobbin 21 through the thread supply hole 45 formed in the bobbin casing 41. At this time, the supply chamber 100 wound on the bobbin 21 is moved to the arrowhead-shaped spring 47 formed on the lower side of the drawing by the bobbin 21 which rotates as the amount of winding on the bobbin 21 increases. It is fitted to the step portion 47b of the spring.

On the other hand, when the thread of the bobbin 11 in the sewing position is exhausted, the rotation of each bobbin 11 (21) and the housing 1 is stopped, at which time the bobbin casing (31) (41) is mounted to the lower mount (50) It is rotated by the pivot coupler 90 mounted on the).

The state rotated about 90 ° counterclockwise is shown in Fig. 6B, so that the supply chamber 100 is still fitted to the spring 47 of the bobbin casing 41 in which the supply chamber is wound.

6C shows a state in which the bobbin casings 31 and 41 are rotated 180 °, at which time an unshown conveying member for moving the supply chamber 100 toward the moving groove of the bobbin casing is lowered, which is a hook. It is desirable to have a hook shape.

At this time, the first and second actuating members 60 and 80 moved backwards are refitted to stabilize the bobbin casings 31 and 41, and the pivot coupler 90 is separated from the mount 50 again.

6 is a bobbin casing 41, in which the descending conveying member 88 runs out of thread through the moving groove 46. (Hereinafter referred to as reference numerals), and the teeth 15 of the bobbin 21 are shown. The supply chamber 100 bitten by the teeth 15 of the bobbin 21 is connected to the bobbin 11 filled with thread by the cutting tool 17 mounted on the teeth 15 as the transfer member 88 descends. One end is cut, and the supply source of the supply chamber 100, that is, the chamber 100 connected to the supply chamber pipe 95, is inserted into the bent portion 17a of the sawtooth cutout 17 of the saw tooth.

Subsequent processes are stitched down into the thread supply hole 35 of the left bobbin casing 31, which is full of thread, and stitching into the supply chamber fitted into the spring 37 of the bobbin casing 31, and the thread is exhausted. The bobbin 21 is continuously wound while rotating at the same rotational speed as the rotation of the bobbin 11 for stitching.

On the other hand, the supply chamber 100 is preferably supplied from a tension roller (not shown), such as a tape measure that rotates when the thread is pulled and rotates when the thread is released.

Although the preferred embodiment according to the present invention has been described above, the above-described embodiment does not limit the scope of the present invention.

That is, the shape of the conveying member, the device for detecting the number of revolutions, the release and fixing of the operating member may be a variety of methods.

Accordingly, various changes and modifications may be made without departing from the spirit of the present invention, but such modifications may be found within the scope of the present invention through the appended claims.

As described above, the automatic double bobbin mechanism according to the present invention can fully complement the US patent by the present inventors to solve all problems in real time.

That is, the automatic double bobbin mechanism of the present invention is to ensure that the supply chamber breaks well between the bobbin of the rewinding position and the bobbin of the sewing position, to ensure stable rotation when the bobbin casing rotates, and to adjust the tension of the supply chamber. There is an advantage to this.

In particular, since the bobbin casing rotates independently, there is an advantage that the load that passes through the coupling part of the mail and the female structure between the bobbin casings is eliminated.

In addition, of course, the problem of replacing the bobbin by adopting a conventional complex configuration is a matter of course.

Claims (14)

Two bobbins each positioned at a first position defined as a sewing position and a second position defined as a rewinding position, at which the supply chamber is unwound and stitched at a first position, and at which a thread is wound; Two bobbin casings for accommodating each of the bobbins and having a thread supply hole through which a thread to be supplied passes and a needle is operated; Rotating means for changing the position by rotating the two bobbin casings by 180 °; Thread moving means for supplying the supply chamber to the bobbin of the bobbin casing located at the second position when the two bobbin casings are rotated to change the position; A bobbin driving unit for rotating the bobbin positioned in the second position; Housing housing the two bobbin casings Automatic double bobbin mechanism including The method of claim 1, And each bobbin casing further includes a supply chamber tension adjusting means adjacent to the thread supply hole. The method of claim 2, The supply chamber tension adjusting means is an automatic double bobbin mechanism including an arrowhead-shaped spring inserted and positioned in a direction opposite to the direction of rotation with respect to the thread supply hole of each bobbin casing, and an adjusting means for adjusting the gap of the spring. The method of claim 3, The adjusting means is two screws, automatic double bobbin mechanism for adjusting the gap between the spring and each bobbin casing. The method of claim 1, And a mount for seating said each bobbin casing, said rotating means rotating said mount. The method of claim 5, And the mount is mounted and rotated along an inner circumference of the housing. The method of claim 1, Each bobbin casing further includes a thread moving groove extending from the thread supply hole to the edge of the bobbin casing, wherein the thread moving means moves the supply chamber through the thread moving groove of the bobbin casing located at the second position. Automatic double bobbin mechanism The method of claim 1, Automatic double bobbin mechanism further comprises a fixing means for fixing each bobbin casing of the first and second positions. The method of claim 8, The bobbin casing fixing means includes first and second fixing grooves formed in the bobbin casing; First and second operating members having a shape corresponding to the fixing groove; Automatic double bobbin mechanism further comprises a fixing release means for separating the operating member from the first and second fixing grooves when the rotating means is operated. The method of claim 1, The bobbin is mounted on the bobbin casing and has a protrusion corresponding to the rotation axis of the bobbin, so that the protrusion is fitted to the bobbin shaft when the bobbin is accommodated in the bobbin casing. Automatic double bobbin mechanism. The method of claim 1, The bobbin is formed in each bobbin and the automatic double bobbin mechanism is cut by the teeth of the bobbin in the second position when the thread moving means moves the supply chamber to the bobbin casing in the second position. The method of claim 11, Automatic double bobbin mechanism further comprises a cutting tool fitted to the teeth of each bobbin. The method of claim 12, The cutting tool is an automatic double bobbin mechanism consisting of a bent leaf spring member The method of claim 1, Automatic double bobbin mechanism for rotating the bobbin drive unit so that the bobbin in the second position rotates at the same speed as the bobbin in the first position.