KR20020019399A - Bobbin thread winding device - Google Patents

Abstract

PURPOSE: To provide a bobbin thread winding device which is low-cost and with which a variety of threads can be set with a high reliability. CONSTITUTION: The bobbin thread winding device is composed of a bobbin supplying means 11 provided with a thread supplying nozzle 14, a bobbin changing device 30 provided with a function of longitudinally moving a bobbin 72 and a bobbin case 70 and other functions, a bobbin rotating means 20 for rotating the bobbin 72, a thread handling means 40 with a moving mess for handling and cutting the thread after the bobbin thread is supplied, and the like. At the time of guarding the thread, the bobbin case 70 is longitudinally moved and the extremity end 14a of the thread supplying nozzle 14 extending the bobbin thread L is relatively moved so that it is positioned on the back 70f of the bobbin case 70. At the same time, the bobbin 72 is rotated by a winding motor M1 and a tension is applied to the bobbin thread L for guiding the bobbin thread L to a thread guiding-out section 70c.

Description

Bobbin thread winding device {BOBBIN THREAD WINDING DEVICE}

The present invention relates to a lower thread winding apparatus that enables thread guidance for passing a thread through a predetermined thread path on the bobbin case after winding the thread in the bobbin.

As an automatic bobbin thread feeder for automatically supplying bobbin thread to bobbins, it is known from Japanese Patent Laid-Open No. 7-68071 (US Pat. No. 5,584,257).

This bobbin automatic feeder is composed of a bobbin changer, a residual thread removal device, and a bobbin thread winding device.

The bobbin changing device holds the bobbin inside to hold or open the bobbin case that can be mounted in the drum of the sewing machine, and supports the gripping means, rotates around the axis, and moves in the axis direction of the axis. The bobbin case having the bobbin with the thread consumed by the rotatable arm is taken out of the drum, and the bobbin case having the bobbin wound with the thread is mounted on the drum.

Residual chamber removal device is provided with a configuration for removing the thread remaining in the bobbin mounted on the bobbin case taken out from the drum.

In addition, the lower thread winding device has a configuration in which a bobbin thread is wound around the bobbin removed from the remaining chamber, and at the same time, a thread guide operation for guiding the end of the lower thread wound on the bobbin through a bobbin case outer circumferential surface and a tension adjusting spring to a predetermined lead-out unit The guide mechanism is arranged.

The bobbin automatic feeder having the above-described configuration operates when the sewing machine is stopped when the bobbin bobbin in the bobbin case mounted in the drum of the sewing machine is less than a predetermined winding amount, and takes out the bobbin case from the drum by the bobbin changer. At the same time, another bobbin case having a bobbin wound in advance is mounted in the drum, and the sewing machine starts sewing again. The thread remaining in the bobbin in the bobbin case taken out of the drum during this re-opening sewing operation is removed by the residual thread removing device, and then a predetermined amount of thread is wound around the bobbin by the lower thread winding device. When a predetermined amount of the lower thread is wound, the lower thread is inserted by the thread guide mechanism under the tension adjusting spring of the bobbin case to be guided to a predetermined lead portion, and then the thread is cut so that the lower thread protrudes from the bobbin case for a predetermined length. When the bobbin thread wound on the bobbin is consumed again, the above operation is repeated to replace the bobbin case.

Here, the thread guide mechanism disposed in the conventional lower thread winding device includes a base 201 fixed to a base of the lower thread automatic feeding device as shown in FIG. 21, and pivotally around the point 201 a on the base 201. In the skirt section 202c of the bobbin case 202, the wiper 200 and the driving means (not shown) for rotating the wiper 200 and the bobbin thread wound on the bobbin and drawn out from the bobbin opening 202a are attached. And a thread unfolding member (not shown) for guiding the slit 202b between the open end 202e and the bobbin flange 203a. The wiper 200 is integrally formed with a thread guide member 200b extending in the rotational axis direction of the bobbin 203 and a threader member 200a vertically disposed with the thread guide member 200b.

Based on the above configuration, the actual guide operation is performed as follows.

That is, the lower thread L is guided to the slit 202b by the thread spreading member to be in the state of FIG. 21 (a).

Subsequently, when the wiper 200 is rotated laterally around the point 201a as shown in FIG. 21 (b), the lower thread L is hung on the member 200a to be threaded, and the lower thread L is guided. The bobbin case 202 passes under the lower thread tension adjusting spring 202f along the outer circumferential surface of the bobbin case 202, and the lower thread L is led to the thread extraction portion 202d (Fig. 1 (b)). After that, the wiper 200 returns to its original position, and the unwinding process is completed.

However, in the above structure, there existed two subjects shown next.

(1) In the conventional configuration in which the lower thread L is guided and guided by the wiper 200, the operating distance, the speed, the operating trajectory, etc. of the wiper 200 do not match the conditions such as the type and thickness of the lower thread. Insufficient thread guidance to the lead portion 202d or breaking of the thread was cut in the middle, resulting in poor quality and reliability of thread guidance. In particular, it is highly likely that the thread guidance will be insufficient in thick yarns, and in the weak yarns (especially cotton yarn), thread breakage is likely to occur.

(2) In the conventional lower thread winding apparatus, when the lower thread L is wound on the bobbin, the lower thread L is wound in the axial direction so as to be equal to the axial direction of the bobbin, so that the lower thread L when the thread winding is completed The final axial position of becomes an unspecified position. And when the bobbin thread (L) of the predetermined amount (more than 80 ~ 90% of the bobbin winding volume that the bobbin can accommodate) is wound, especially when the bobbin thread (L) is located near both flanges of the bobbin In some cases, the actual guidance was insufficient.

For example, when the lower thread L is located near the bobbin flange on the opposite side of the bobbin case open end 202e, the lower thread L is guided to the bobbin case open end 202e by the thread spreading member. Even if it is caught in a closed room wound on the bobbin in advance, the range that the lower thread (L) can move becomes narrow. For this reason, the lower thread L does not enter between the skirt end surface 202c of the bobbin case and the bobbin flange end surface 203a, and thread guidance may become inadequate.

In addition, when the lower thread L is located near the bobbin flange 203a on the open end 202e side of the bobbin case, the point of the lower thread L is often linear with respect to the entrance of the bobbin case slit 202b. In the case of the thread guide process, when the thread is loosened, the thread posture moves along the point so that the thread guide may be insufficient because the thread moves past the entrance of the slit 202b.

In addition, in the conventional configuration, the wiper 200 and its surrounding members are disposed for the thread guiding operation, thereby increasing the cost.

An object of the present invention is to provide a lower thread winding device which is low cost and which can be thread guided with high reliability to a wide variety of yarns.

1 is a front view showing the configuration of the lower thread automatic supply device 100 to which the lower thread winding device 10 of the first embodiment to which the present invention is applied.

Figure 2 is a side view showing the configuration of the bobbin changer 30 provided in the lower bobbin automatic supply device 100 of FIG.

Fig. 3 is a diagram showing the configuration of the lower thread winding apparatus 10 of the first embodiment, wherein (a) is a top view thereof and (b) is a front view thereof.

4 is a view showing the thread spreading body 40 of the lower thread winding apparatus 10 of FIG. 3, (a) is a plan view thereof, and (b) is a side view thereof.

5 is a view showing the configuration of the bobbin case 70, the bobbin 72, and the clutch plate 25 to be handled by the lower thread automatic supply device 100 of FIG.

6 is a block diagram showing a configuration of a control unit of the lower thread automatic supply device 100 of FIG. 1.

FIG. 7 is a side view showing the flow of a series of processes of thread entanglement, thread winding, thread unwinding, thread guide, thread cutting by the lower thread winding device 10 of FIG.

8 is a plan view for explaining the positional relationship between the bobbin case 70 and the thread spreading body 40 during thread cutting in thread spreading.

9 is a plan view for explaining the positional relationship between the bobbin case 70 and the thread spreading body 40 during thread cutting in thread spreading.

10 is a plan view for explaining the positional relationship between the bobbin case 70 and the thread spreading body 40 during thread cutting in thread spreading.

11 is a plan view for explaining the positional relationship between the bobbin case 70 and the thread spreading body 40 during thread cutting in thread spreading.

12 is a plan view for explaining the positional relationship between the bobbin case 70 and the thread spreading body 40 during thread cutting in thread spreading.

Fig. 13 is a plan view for explaining the positional relationship between the bobbin case 70 and the thread spreading body 40 during thread cutting in thread spreading.

Fig. 14 is a view showing the shape of the thread guide processing in the first embodiment, (a) is a view showing the shape before the thread guide processing, and (b) is a view showing the shape after the thread guide processing.

Fig. 15 is a diagram showing the shape of the yarn guide processing in the first embodiment, where (a) is a top view thereof and (b) is a side view thereof.

FIG. 16 is a flowchart showing a control process by the control unit of the lower thread automatic supply device 100 of the first embodiment.

FIG. 17 is a flowchart showing control of the lower thread winding process S11 in FIG.

FIG. 18 is a flowchart showing control of the real guidance processing T4 in FIG. 17. FIG.

Fig. 19 is a flowchart showing control of the thread guide processing T4 in the lower thread winding apparatus of the second embodiment.

20 is a block diagram showing a configuration of a control unit of the lower thread automatic supply device of the third embodiment.

Fig. 21 is a perspective view showing the shape of the thread guiding process by the conventional thread guiding mechanism, (a) is a view showing the shape before the wiper 200 is operated, and (b) is the shape after the wiper 200 is operated. It is a figure which shows.

※ Explanation of symbols about main part of drawing ※

14: thread supply nozzle (bottom thread supply means) 20: bobbin rotation means

25: retractable clutch plate (rotating body) 35: linear movement drive means

40: thread spreading body with a moving blade (thread spreading member) 70: bobbin case

70a: bobbin case opening 70b: slit

70c: actual lead portion 70g: circumferential side

72: bobbin

82: CPU (part of control means, part of tensioning control means)

90: ROM (part of control means, part of tensioning control means)

91: RAM (part of control means, part of tensioning control means)

In order to solve the above problems, the invention of claim 1 is, for example, as shown in Figs.

Lower thread supply means (e.g., thread supply nozzle 14) having a tip portion 14a which derives the lower thread L from the lower thread supply source and is movable to a desired position;

Bobbin rotating means 20 having a rotating body (retractable clutch plate 25) foldable to the bobbin 72 accommodated in the bobbin case 70 and rotating the bobbin coupled by the rotation of the rotating body,

Linear movement means (eg, linear movement drive means 35) for folding the rotating body to the bobbin accommodated in the bobbin case;

Thread unrolling member (e.g., capturing a thread which has been wound on the bobbin and extends from the opening 70a of the bobbin case to the lower thread supply means, and guides the thread path from the opening to the slit disposed on the circumferential side of the bobbin case). For example, in the lower thread winding device 10 having a thread spreading body 40,

Control means for moving the tip of the lower thread feed means and the bobbin case retracting position relative to each other in the circumferential direction or the axial direction of the bobbin case or their compounding direction by the movement of one or both (for example, the CPU 82). RAM 91, ROM 90),

It is provided with tensioning control means (e.g., CPU 82, RAM 91, ROM 90) for tensioning the bobbin by rotating the bobbin in a predetermined direction by the bobbin rotating means during thread guiding. It is characterized by one.

According to the invention of claim 1, the front end portion and the bobbin case retracting position are moved relatively by the control means in the circumferential direction or the axial direction of the bobbin case or their compounding direction, so that the lower thread path is appropriate for each treatment in the lower thread winding process. The relative positional relationship between the tip and the bobbin case retracting position can be adjusted as much as possible.

Here, tension is applied to the lower thread extending from the bobbin case by rotating the bobbin by the bobbin rotating means. This tension is used to place the lower thread in the desired thread path. That is, in a series of bobbin winding processes in which the bobbin thread is arranged in a predetermined path, the relative position between the tip of the bobbin thread feeding means and the bobbin case retracting position without arranging a special configuration for carrying out each treatment, and the tension in the bobbin thread The lower thread is arranged in a predetermined path by imparting.

In the lower thread winding process, the lower thread is first supplied from the bobbin case opening to the bobbin for supplying the lower thread. Thereafter, the thread spreading member catches the thread extending from the bobbin case opening to the bobbin thread feeding means, and the thread spreading member guides the lower thread to the slit disposed on the bobbin case circumferential side (thread spreading process). Subsequently, in this state, the lower thread is led to the thread extracting portion disposed on the circumferential side of the bobbin case which is disposed on the bobbin case circumferential side and the lower thread is placed under the thread tension adjusting spring, and at the same time the tip end of the lower thread tension adjusting spring overlaps. (Room guidance processing). After that, the bobbin thread is cut (thread cutting treatment) to make it ready for use, and it is waited until the next bobbin change.

In the conventional "thread guide processing", the lower thread guided to the distal end of the lower thread tension adjusting spring by the "thread unwinding process" is captured by a wiper, and the lateral force is applied to the lower thread by rotating the wiper in the state of capturing the lower thread. It leads to actual delivery.

According to the above-described configuration of claim 1, the lower thread path can be adjusted as desired by appropriately adjusting the relative positional relationship between the tip of the lower thread supply means and the bobbin case retracting position by the control means. Accordingly, the lower thread feeding means tip and bobbin case advance position so that the lower thread that extends to the tip of the lower thread tension adjusting spring during the `` thread guide processing '' is arranged along the side of the lower thread tension adjusting spring and toward the thread exiting part, for example. The relative positional relationship with can be adjusted.

The tension is applied to the lower thread extending from the bobbin case by winding the bobbin by rotating the bobbin by bobbin rotating means in the state where the lower thread is arranged in such a path. Here, if the lower thread is arranged along the side of the distal end of the lower tension adjusting spring and on the path toward the thread exiting part, the tension given by rotating the bobbin acts to push the lower thread under the lower tension adjusting spring and simultaneously thread the lower thread. It acts to lead to the derivation part, and the real guidance process is performed.

In other words, by applying the configuration of claim 1 to the "thread guide processing", the wiper, which is a configuration for the conventional "thread guide", and the configuration for driving the wiper are unnecessary, so that the number of parts can be greatly reduced, thereby reducing the cost. Contribute to. In addition, the lateral force is not applied to the lower thread as in the case of "thread guide processing" by the wiper, and the thread break at the "thread guide processing" is greatly suppressed. As a result, the reliability of the thread guide processing is greatly improved, and the reliability of the lower thread automatic feeder to which the lower thread winding device is applied is increased.

According to the invention of claim 2, for example, in the lower thread winding apparatus of claim 1, as shown in FIG.

The relative movement and tensioning of the yarns may be performed simultaneously or independently.

According to the invention of claim 2, the same effects as in claim 1 can be obtained, and relative movement and tensioning are performed at least once, thereby increasing the reliability of each processing (thread guide processing, etc.) in the lower thread winding processing.

The invention of claim 3 is, for example, in the lower thread winding apparatus of claim 1, as shown in Figs. 11 and 12,

The relative movement and tensioning of the yarn are intermittently performed.

According to the invention of claim 3, the same effects as those of claim 1 can be obtained, and the reliability of each process (real guide processing or the like) in the lower thread winding process is further improved. In other words, when the lower thread is placed in a predetermined thread path by each process in the lower thread winding process, the relative movement and tensioning are intermittent to ensure that the lower thread is properly recaptured, thereby preventing the thread breakage and thread breakage. The reliability of guiding the lower thread to a predetermined real path is increased.

The invention of claim 4 is, for example, in the lower thread winding apparatus described in claim 1 as shown in Figs. 6, 11, 12, and 18,

The amount of movement of the tip of the lower thread supply means;

The movement amount of the linear movement means,

The bobbin rotation means and the amount of tension applied to the seal by the relative movement is characterized in that the mutually independent variable.

According to the invention of claim 4, the same effect as in claim 1 can be achieved, and the amount of movement of the tip of the lower thread supply means, the amount of movement of the linear movement means, and the amount of tension applied to the yarn by the bobbin rotation means and the relative movement are independent of each other. Since the variable is a variable, these variables are independently suppressed by the control means and the tensioning control means.

Therefore, the degree of freedom in arranging the lower end supply means and the bobbin case retracting position relative to each process (thread guide processing, etc.) of the lower thread winding process is increased, and the degree of freedom in applying tension to the lower thread is increased. Thereby, these variable variables can be controlled so as to be suitable for each treatment, and a highly reliable lower thread winding device is obtained.

In addition, the "tension imparting amount" refers to the tension imparted to the thread by relatively moving both the linear movement of the bobbin case and the distal end of the bobbin supply means in addition to the tension imparted to the thread by rotating the bobbin by the bobbin rotating means. Contains amount.

The invention of claim 5 is, for example, in the lower thread winding apparatus of claim 1, as shown in Fig. 14, 15,

When passing the thread extending from the bobbin case guided to the slit disposed on the circumferential side of the bobbin case passes under the lower thread tension adjusting spring 71 disposed in the bobbin case,

The lower thread supply means distal end portion is arranged from the center line of the thread extraction portion 70c disposed on the circumferential side surface of the bobbin case to the opposite side to the open end of the bobbin case and inside the outer diameter of the bobbin case.

According to the invention of claim 5, the lower thread supply means distal end portion is arranged from the center line of the thread extraction portion disposed on the circumferential side of the bobbin case to the opposite side to the open end of the bobbin case and inside the outer diameter of the bobbin case. Accordingly, the thread path is guided in the tangential direction of the bobbin case outer circumference, so that the thread can easily enter the lower thread tension adjustment spring.

In this state, tension is applied to the thread so that the thread extending from the bobbin case guided by the slit disposed on the bobbin case circumferential side passes through the lower thread tension adjusting spring disposed on the bobbin case.

Invention of the sixth aspect in the lower thread winding apparatus described in claim 1, for example, as shown in Figs.

The tip end portion is arranged from the tangent of the slit end to the bobbin case and the end width a range of the lower thread tension adjusting spring 71 until the thread unfolding member is guided to the slit and the thread unwinding member is retracted. It is characterized by the looseness of the lower thread.

According to the invention of the sixth aspect, the tip of the lower thread supply means is disposed from the tangent of the slit end to the bobbin case side and the lower thread supply means tip center is located in the tip width range of the lower thread tension adjusting spring, for example, to rotate the bobbin by the bobbin rotation means. Take the looseness of the bobbin thread.

At this time, since the thread unfolding member is evacuated and the lower thread is captured by the thread unfolding member, the lower thread is disposed in a state of being floated from the outer peripheral surface of the bobbin case. And since the tip of the lower thread supply means is just in the vicinity of the lower thread tension adjusting spring of the bobbin case, the movement of the lower thread is optimally prepared to enter under the lower thread tension adjusting spring.

Invention of Claim 7 is the lower thread winding apparatus of Claim 1, for example, as shown to FIGS.

The thread spreading member is guided to the slit and then retracted to open the thread, and the thread ejection part 70c disposed on the circumferential side of the bobbin case with the lower thread extending from the lower thread supply source to the bobbin case after opening the thread. At least 90 ° by the bobbin rotating means before guiding to the bobbin characterized in that it rotates in the real winding direction.

According to the invention of the seventh aspect, after the thread spreading by the thread spreading member is completed and the thread spreading member is evacuated, the bobbin is rotated in the real winding direction by the bobbin rotating means (at least 90 °) from the bobbin supply source to the bobbin case. The stretched lower thread is properly tensioned and enters the lower thread tension adjusting spring.

Invention of Claim 8 is the lower thread winding apparatus of Claim 1,

The thread spreading member (e.g., thread spreading body 40) guides the thread path of the thread to the slit by the intermittent operation, and performs the thread unfolding after a predetermined number of intermittent movements when the thread is unfolded after the bobbin winding of the bobbin ends. It is characterized in that the tension is applied to the thread by the bobbin rotating means.

According to the invention of claim 8,

The thread unfolding member which guides the lower thread and expands predeterminedly rotates the circumference of the bobbin case circumferential side, and the real path from the bobbin opening to the part which catches the lower thread of the thread unfolding member changes by the positional noise of this thread unfolding member. According to the above configuration, however, tension is applied to the thread by the bobbin rotating means according to the angle of the thread spreading member by the intermittent operation when the thread is unfolded after the lower thread winding to the bobbin is finished. In this way, unfolding is appropriately performed.

According to the invention of claim 9, in the lower thread winding apparatus according to claim 1,

The bobbin case includes a lower thread tension adjusting spring 71 disposed on the circumferential side 70g, and a thread extracting part 70c disposed on the circumferential side of the lower thread tension adjusting spring that substantially overlaps the tip 71a of the lower thread tension adjusting spring.

The relative movement between the bobbin case and the lower thread supply means tip is wound so that the thread wound on the bobbin and extending from the bobbin case to the bobbin supply source passes through the bobbin case's lower thread tension adjusting spring and is guided to the thread ejection part of the bobbin case. , Characterized in that the lower thread tension is controlled.

According to the invention of claim 9, the relative movement between the bobbin case and the lower thread supply means and the tension of the lower thread are controlled so that the thread wound on the bobbin and extending from the bobbin case to the lower thread supply source passes under the bobbin case lower tension adjusting spring. Also, the thread guide portion is guided to the thread extraction portion of the bobbin case, and the thread guide processing is performed with high reliability.

In addition, in the series of bobbin winding processing in which the bobbin thread is basically arranged in a predetermined path as in claim 1, the relative position between the bobbin case retracting position and the bobbin case retracting position without arranging a special configuration for carrying out each treatment. It is arranged in a predetermined thread path by controlling and applying tension to the lower thread. This contributes to the reduction of the number of parts and the cost reduction, and the lower thread does not act in the lateral direction as in the case of thread guiding using a conventional wiper, resulting in high reliability.

Invention of Claim 10 is the lower thread winding apparatus of Claim 1, for example, as shown in FIG.

The bobbin case includes a lower thread tension adjusting spring 71 disposed on the circumferential side surface 70g, and a thread lead-out portion 70c disposed on the circumferential side surface of the lower thread tension adjusting spring that substantially overlaps the tip portion 71a.

The thread is caught by the thread spreading member, and the tension is applied to the thread with the lower thread supply means distal end arranged on the opposite side of the bobbin case from the center line of the thread extraction portion disposed on the circumferential side of the bobbin case. ,

The bobbin wound around the bobbin and extending from the bobbin case to the bobbin supply source is controlled to pass under the bobbin case tension adjusting spring of the bobbin case and to be guided to the thread extracting part of the bobbin case.

According to the invention of claim 10, the lower thread is caught by the thread spreading member and the tension to the lower thread is reduced from the center line of the thread extracting part arranged on the circumferential side of the bobbin case, opposite the open end of the bobbin case. By giving, the lower thread extending from the bobbin case is guided to the thread extraction portion.

In other words, depending on the shape of the circumferential side surface of the bobbin case (for example, an angled shape or the like), the movement of the lower thread may be suppressed and the thread guiding process may be hindered in the thread unfolding process. However, according to the structure of Claim 11, the lower thread is caught by the thread spreading member, and a loose angle arises in the lower thread which extends from the front end of the lower thread supply means near the thread extracting part of the bobbin case. Therefore, when tension is applied to the lower thread, the thread moves in a straight line, so that it is easy to pass through the thread extraction portion of the bobbin case, and it is possible to cope with bobbin cases of various shapes. As a result, the reliability of the lower thread winding process becomes higher.

(First embodiment)

Next, the lower thread winding apparatus 10 of the first embodiment will be described with reference to FIGS. 1 to 18.

The bobbin thread winding device 10 of the first embodiment is disposed in the bobbin case automatic feeding device 100 to automatically wind a predetermined amount of bobbin thread in the bobbin in the bobbin case, and at the same time the end of the bobbin thread wound to the bobbin case is "thread guide processing". To be usable.

First, with reference to FIGS. 1-3, the schematic structure of the lower thread automatic supply apparatus 100 is demonstrated.

This lower thread automatic supply device 100 is composed of a bobbin changing device 30, a residual chamber removing device 110 (shown in Figure 6), a lower thread winding device 10, and the like as shown in FIG.

The bobbin automatic feeder 100 automatically bobbins bobbins and bobbin cases in the drum K when the bobbin changer 30 operates when the bobbin bobbin in the drum K is consumed and becomes less than a predetermined amount. The bobbin in the bobbin case displaced from the book K is automatically wound up while being replaced with the set bobbin and bobbin case.

T is a sewing machine bed.

In FIG. 1, L1 denotes a dummy position in which bobbins and bobbin cases are pre-wound, and L2 denotes a residual material for removing the remaining thread of the bobbin in the bobbin case separated from the drum K by the residual chamber removing device 110. L3 is the bobbin winding position for winding the bobbin to this bobbin.

Book K is fitted in the through-hole 72a (FIG. 5) of the bobbin 72, the intermediate structure (ro) for fixing the bobbin 72 and the bobbin case 70 is disposed in the center of the well-known structure Have In the dummy position (L1) and the residual chamber removing device (L2) is provided with a bobbin fixing shaft (r1) (r2) is fitted into the through hole (72a) to fix the bobbin 72 and the bobbin case (70).

The bobbin exchange device 30 supports the bobbin gripping means 31 for holding and opening the bobbin case 70 and the bobbin gripping means 31 at the tip, as shown in Figs. ), The carrier arm 33 supported on the support shaft 32 so as to be rotatable and to move (linearly move) in the axial direction thereof, and the rotation driving means 34 to rotate the carrier arm 33; And linear movement driving means 35 for moving the carrier arm 33 in the axial direction.

The rotation drive means 34 is fixed to the rotationally arranged rotating motor (stepping motor) 34a, the first pulley 34b fixed to the rotor 34aa of the rotation motor 34a, and the support shaft 32. The second pulley 34c, the timing belt 34d that extends between the two pulleys 34b and 34c, and the carrier arm 33 are fixed and supported to be movable in the axial direction with respect to the support shaft 32. Spline nut 34e and the like. The rotation drive means 34 is a rotational drive of the rotation motor 34a is transmitted to the support shaft 32 through the first pulley 34b, the timing belt 34d, the second pulley 34c, and the support shaft ( The spline nut 34e rotates with the rotation of 32, and the conveyance arm 33 fixed to the spline nut 34e rotates integrally.

In addition, the linear movement driving means 35 has a rotational axis which is perpendicular to the axis of the support shaft 32 as shown in FIG. 2 and is fixed to a linear movement motor (stepping motor) 35a fixed near one end of the support shaft 32, and a straight line. The first pulley 35b fixed to the rotor 35aa of the moving motor 35a, the second pulley 35c disposed in the vicinity of the other end of the support shaft 32, and the axis thereof with respect to the support shaft 32. The coupling member 35e, which is movably and rotatably supported in the direction and fixed to the spline nut 34e, and the timing belt 35d fixed to the connecting member 35e across both pulleys 35b and 35c. And the like.

In the linear movement driving means 35, when the linear movement motor 35a is driven, the timing belt 35d spanning the first pulley and the second pulley 35b, 35c is rotated, whereby the connecting body 35e is rotated. Moves in the axial direction of the support shaft 32. At this time, the spline nut 34e and the carrier arm 33 move linearly along the support shaft 32 together with the connecting body 35e.

The book K, the dummy position L1, the remaining chamber removal position L2, and the lower thread winding position L3 are arranged on the same circular arc around the support shaft 32. As shown in FIG. In addition, the bobbin changer 30 rotates the transfer arm 33 by the rotation driving means 34, which is the basis of the control of the CPU 82, from the book K to the remaining chamber removing position L2, and the dummy position. Each movement of bobbin and bobbin case from (L1) to book (K), remnant removal position (L2) to lower thread winding position (L3) and from lower thread winding position (L3) to dummy position (L1) Do it. In addition, the bobbin changer 30 moves the carrier arm 33 in the axial direction (linear movement) by the linear movement driving means 35 under the control of the CPU 82, and the respective axes r0 (r1). The bobbin and the bobbin case are mounted or removed with respect to (r2), or the bobbin and bobbin case are moved or moved to a predetermined position at the lower thread winding position L3.

The lower thread winding device 10 is a thread supply detecting means 60, a lower thread access means 50, a bobbin rotating means 20 and a lower thread supply means 11, and a lower thread winding or lower thread winding as shown in FIG. It consists of the thread spreading body 40 (thread spreading member, shown in FIG. 4) etc. for performing a thread unfolding and a thread cutting after.

That is, in the lower thread winding apparatus 10 of the first embodiment, the wiper 200 which is a conventional configuration for "thread guidance" and its peripheral member (shown in FIG. 21) are not disposed. This reduces the number of parts and contributes to cost reduction.

The bobbin rotating means 20 is a winding 25a (a stepping motor) M1 fixed to the base as shown in Figure 3, the motor pulley 21 fixed to the motor shaft, the shaft 25a wound through the clutch mechanism 24 Retractable pulley (23), motor pulley (21) and reeling pulley (23) that are connected to the timing belt (22), reeling clutch (25) that is fixed to the end of the reeling shaft (25a) Etc.)

Accordingly, the winding shaft 25a is rotated through the motor pulley 21, the timing belt 22, the winding pulley 23, and the clutch mechanism 24 by the driving of the winding motor M1, and the winding shaft is rotated. (25a) The retracting clutch plate 25 fixed to the tip is rotated. Accordingly, the bobbin 72 is rotatable when the clutch plate 25 wound around the side of the bobbin 72 in the bobbin case 70 held at the lower thread winding position L3 is engaged.

Although not shown, the clutch mechanism 24 is capable of moving the take-up shaft 25a a predetermined stroke in its axial direction and is loaded in accordance with the amount of movement of the take-up shaft 25a toward the take-up pulley 23 side. It has a spring clutch configuration with an elastic body (not shown) which increases the bias force, that is, strengthens the connection between the take-up pulley 23 and the take-up shaft 25a, whereby the take-up shaft 25a is wound up. When the pulley 23 is moved to the maximum pulley 23, the rotation is the same as the pulley 23, and as the distance from the take-up pulley 23 is decelerated rotation.

In addition, as shown in FIG. 5, the retractable clutch plate 25 includes a base shaft 25c inserted into the through hole 72a of the bobbin 72 and a flange of the bobbin 72 to stabilize the rotation of the bobbin 72. Convex portions 25b and 25b which are inserted into the hole portions 72c already installed in the 72b) and transmit the rotational motion to the bobbin 72 are arranged.

According to the bobbin rotating means 20, the bobbin gripping means 31 is held in the lower thread winding position L3 in the direction of the clutch plate 25 which winds up the transfer arm 33 while the bobbin case 70 is held. By moving and contacting and pressing the clutch plate 25 to wind the bobbin 72, the rotation of the clutch plate 25 to which the winding shaft 25a is wound is transmitted to the bobbin 72, while the transfer arm 33 The rotation of the clutch plate 25 to be wound is not transmitted to the bobbin 72 by allowing the bobbin 72 to be spaced apart from the clutch plate 25 to be wound up. And when the bobbin 72 and the retracting clutch plate 25 contact in a state without a compressive force (or a weak compressive force), it will be in a half-clutch state.

In the half-clutch state, the bobbin 72 floats from the bottom of the bobbin case 70 by the action of an anti-static spring (not shown) disposed on the inner bottom of the bobbin case 70, and the bobbin case 70 is opened. The inner end surface of the bobbin flange 72b on the side 70d side (outside of the bobbin case 70) is positioned substantially flush with the end edge of the open end 70e of the bobbin case 70. Accordingly, a slight gap is provided between the inner end surface of the bobbin flange 72b and the open end 70e of the bobbin case 70. Therefore, as described below, the lower thread L is smoothly guided from the bobbin case opening 70a to the slit 70b in a half-clutch state during the unfolding operation.

In the half-clutch state, the convex portions 25b and 25b of the retractable clutch plate 25 are inserted into the hole portions 72c and 72c of the bobbin 72 so that the bobbin 72 does not idle. It rotates in accordance with the rotation of the take-up clutch plate 25.

The lower thread supply means 11 includes a thread aspirator 12 having a lower thread L drawn therefrom drawn from the lower thread supply source through the lower thread entry and exit means 50, the thread supply nozzle 14, and the solenoid valve 15. The air supply nozzle 14 is rotated about the lower thread supply path in the thread aspirator 12 by the opening operation, and the thread aspirator 12 is rotated around the support shaft 13 to thereby rotate the thread supply nozzle 14 to FIG. A nozzle rotation motor (stepping motor) M2 for moving to the initial operating position N1, the lower thread winding position N2, and the thread cutting position N5 shown in FIG.

According to the lower thread supply means 11, the thread supply nozzle is driven by driving the nozzle rotating motor M2 in a state in which a lower thread L having a length necessary for entanglement is stored in the thread supply nozzle 14 in advance. The tip portion 14a of (14) is positioned at the initial working position N1 near the bobbin case opening 70a. At this time, the lower thread L stored therein is opened and air is supplied to blow the air out of the tip portion 14a of the thread supply nozzle 14 to derive the lower thread L, and the lead chamber is opened in the bobbin case opening. It guides inward from 70a. At this time, the lower thread L guided into the bobbin case by blowing the air into the bobbin 72 which is rotated by the above-described winding motor M1 to form a vortex around the bobbin shaft 72d. Is wound around the bobbin shaft 72d. Thereafter, the nozzle rotation motor M2 is driven to be uniformly wound so that the tip 14a of the thread supply nozzle 14 is moved from the initial working position N1 to the lower thread winding position N2 so that the bobbin thread can be wound. Wind up

In FIG. 3, the thread supply detecting means 60 detects the transfer of the lower thread L between the lower thread supply source and the thread aspirator 12.

The lower thread entry / exiting means 50 acts on the lower thread L between the thread supply detecting means 60 and the thread suction unit 12 to temporarily seal the lower thread L coming out of the nozzle 14 into the thread supply nozzle 14. The lower thread L can be drawn out of the front end portion 14a of the thread supply nozzle 14 by air by dragging and storing a predetermined length into the inside of the chamber and releasing the action to the lower thread L to open the lower thread L. do.

The thread spreading body 40 with a moving blade is not shown, but is supported on the base so as to be rotatable about the same axis as the rotational shaft 25a, and is driven by the driving motor 41 (shown in FIG. 6). Thereby, an operation such as thread unfolding is performed while moving (rotating) along the circumferential side surface 70g of the bobbin case 70 held at the lower thread winding position L3.

The thread spreading body 40 is formed in a curved shape in an arc shape as shown in Fig. 4 (b), and is disposed at its tip side (left side of Fig. 4 (a)) to guide the lower thread L at the time of supplying the lower thread. A cutout portion 40a serving as a guide portion and a lower thread L which is disposed adjacent to the thread feed nozzle 14 and the bobbin 72 after the lower thread feed is extended to guide the bobbin case opening 70a to the slit 70b. As a thread cutting part 40b as a thread unfolding part formed in a U shape, and a thread cutting guide part for guiding the lower thread to a V-shape at the time of thread cutting formed at the rear end side (right side of FIG. 4 (a)) and formed into a V shape. A cutout portion 40c and a scalpel portion 40d disposed on the upper surface of the extension line along the circumferential side at the apex of the cutout portion 40c are provided.

In addition, the relative movement in the axial direction between the bobbin case 70 at the thread spreading body 40 and the lower thread winding position L3 is obtained by the movement of the bobbin case 70 by the linear movement of the carrier arm 33. Lose.

In addition, in the lower thread automatic supply apparatus 100 of the first embodiment, the vibration detection unit 95 is disposed in the sewing machine bed T as shown in FIGS. 1 and 2. The vibration detection unit 95 includes, for example, a piezoelectric element, and converts the vibration generated in the sewing machine bed T into an electrical signal according to its size, and through the I / O port 81 as a vibration detection signal. Output for (82). For example, unfolding treatment or the like is adversely affected by vibration. Therefore, the CPU 82 monitors the vibration detection signal from the vibration detection unit 95 and stops these operations or processing when the vibration detection signal exceeds a predetermined value even when the operation signal of the lower thread automatic supply device 100 is input. . Therefore, these processes are performed while the sewing operation of the sewing machine is stopped, and is reliably processed without being affected by vibration. In addition, "constant value" is a vibration value of the extent that it hardly adversely affects each process of the lower thread automatic feeder 100 side.

As shown in FIG. 6, the control unit of the lower thread automatic supply device 100 includes a central processing unit (CPU) 82, a random access memory (RAM) 91, a read only memory (ROM) 90, and an I / O port 81. ) And drivers 83 to 88 of the respective drive units of the lower thread automatic feeder 100.

The nozzle rotation motor M2 is connected to the I / O port 81 through the driver 85, and the linear movement driving means 35 of the bobbin changer 30 is connected through the driver 87. In addition, the take-up motor M1 is connected to the I / O port 81 through the driver 84. The operation display panel 89 and the actual supply detecting means (mechanism) 60 are connected to the I / O port 81. The other drive mechanisms such as the residual chamber removing device 110, the thread unfolding motor 41, and the solenoid valve 15 are connected to each other through the driver.

That is, the CPU 82, the RAM 91, and the ROM 90 drive the linear movement driving means 35 and the actual supply nozzle 14, and constitute the control means, and at the same time rotate the take-up clutch plate 25. The tensioning control means is constituted by driving the winding motor M1.

In the lower thread winding apparatus 10 of the first embodiment, the amount of movement of the tip portion 14a of the thread supply nozzle 14 by the nozzle rotation motor M2 and the bobbin case 70 by the linear movement driving means 35 are shown. The amount of linear movement of and the amount of tension applied to the lower thread L given by the bobbin 72 being rotated by the take-up motor M1 can be controlled independently of each other.

In addition, the I / O port 81 in the first embodiment is connected to a sewing machine control unit 93 that controls the sewing operation of the sewing machine to which the lower thread automatic feeding device 100 is attached. A sewing operation signal corresponding to that the sewing machine is in sewing operation is output from the sewing machine control unit 93 to the CPU 82 through the I / O port 81.

While this sewing operation signal is input, the CPU 82 controls not to perform an operation such as detachment or unscrewing of a bobbin that is susceptible to undesirable effects by vibration caused by sewing. In addition, the CPU 82 outputs an operation prohibition signal prohibiting the operation of the sewing machine so that the sewing machine does not move to the sewing machine control unit 93 while the bobbin is changed and the bobbin is changed by the bobbin changing device 30, and the bobbin is When the replacement is completed, the operation permission signal for permitting the operation of the sewing machine is output to the sewing machine control unit 93, and the bobbin thread automatic feeding device is subjected to the sequence processing by the CPU 82, the RAM 91, and the ROM 90. Each driving unit of the 100 is controlled with predetermined control contents.

Next, the bobbin thread automatic feeding process in the first embodiment will be described.

If the lower thread is consumed during sewing and the lower thread of the bobbin 72 in the drum K becomes smaller than a predetermined amount, and there is a need for bobbin change, the thread cutting on the sewing machine side is performed, and then the driving of the sewing machine is temporarily stopped to automatically supply the lower thread. The process starts.

First, the bobbin 72 and the bobbin case 70 in the drum K are gripped by the bobbin gripping means 31 by the rotation and linear movement of the transfer arm 33, and are removed from the drum K. It is sent to (L2) and attached to the bobbin fixed shaft (r2).

Subsequently, the bobbin case 70 attached to the shaft r1 of the dummy position L1 by the bobbin holding means 31 of the transfer arm 33 (the bobbin 72 in which the bobbin thread is wound in advance) is stored. Is held in the book (K) and the lower thread is replenished and the worker is notified at the same time the operation of the sewing machine is released. The worker can continue sewing work by this report.

Subsequently, a residual chamber removing process for removing the residual chamber from the bobbin 72 and the bobbin case 70 of the bobbin thread is performed, and all the residual chamber in the bobbin 72 is removed. If the sewing operation of the sewing machine is stopped when the residual chamber removal process is completed, the bobbin case 70 is moved by the transfer arm 33 and the bobbin gripping means 31 at the bobbin fixed shaft r2 at the residual chamber removal position L2. It will come out and move to the lower thread winding position (L3). If the sewing machine is in the sewing operation after the completion of the remaining chamber removal processing, the bobbin gripping means 31 waits immediately before the remaining chamber removal position L2 until the operation stops.

Next, the lower thread winding process will be described in Figs. 7 (a) to 7 (h). When the lower thread winding process is started, the transfer arm 33 is moved in a straight line to contact the clutch plate 25 which winds up the bobbin 72 in the bobbin case 70 which is gripped, and also the clutch plate 25 which winds up is wound. The bobbin 72 and the retracting clutch plate 25 are pressed against each other by the predetermined stroke.

In this state, as described above, the thread supply nozzle 14 of the lower thread supply means 11 is moved to the initial working position N1 (see FIG. 3 (b)). At this time, if the sewing operation of the sewing machine is stopped, the air is output into the bobbin 72 and the winding motor M1 is driven to rotate the bobbin 72, and the lower thread L is wound around the bobbin shaft 72d. (FIG. 7 (a)). When the lower thread L is sent by the winding and is detected by the thread supply detecting means 60, the nozzle rotation motor M2 is driven based on the detection to move the thread supply nozzle 14 to the lower thread winding position N2. (FIG. 7 (b)).

In addition, if the sewing machine is in the sewing operation when the thread supply nozzle 14 is moved to the initial working position N1, the operation related to the entanglement such as air output is not performed until the operation stops, and the standby state is performed. In the stand-by state, when the operation of the sewing machine stops, the threading operation is performed.

After the thread is entangled, the thread spreader 40 is rotated counterclockwise in FIG. 7, and the lower thread L is wound around the bobbin 72 while guiding the lower thread L by contacting the lower thread guide incision 40a. (Fig. 7 (c)-Fig. 7 (d)).

When a predetermined amount of the lower thread L is wound on the bobbin 72, the driving of the retracting motor M1 is stopped, and the thread supply nozzle 14 is moved forward to the vicinity of the thread spreading body 40, and the thread unfolding is performed. The sieve 40 rotates clockwise in FIG. 7 to evacuate from the lower thread L once (FIG. 7E).

Next, the lower thread L extending from the bobbin case opening 70a is guided to the cutout portion 40b of the thread spreader 40, and the slit 70b is provided in advance on the circumferential side 70g of the bobbin case 70. The unfolding process is started by unfolding (FIG. 7 (f)).

8 to 13, the positional relationship between the bobbin case 70 and the thread spreading body 40 will be described from the thread spreading process to the thread cutting process. In these figures, the arrow CCW direction represents the rotational direction of counterclockwise rotation in FIG. 7, and the arrow CW direction represents the rotational direction of clockwise rotation in FIG. 7. In addition, in these figures, the actual movement is obtained by the unfolding motor in the CCW direction and the CW direction of the unfolding body 40, and the transverse direction of the unfolding body 40 (left-right direction in FIGS. 8 to 13). The movement of the bobbin case 70 is performed by moving the bobbin case 70 relative to the bobbin case 70 by the movement of the bobbin case 70 by the linear movement of the transfer arm 33.

Unfolding process is shown in FIGS. 8-12.

When the thread unfolding process is started, the thread unfolding body 40 is first rotated in the CCW direction at the initial position shown in FIG. 8, and is moved until the distal end portion of the unfolding body 40 overlaps the end of the bobbin case opening 70a. (FIG. 9, path i1). Subsequently, the path i2 is moved, and the cutting part 40b for thread unfolding of the thread spreading body 40 is moved to a position overlapping the bobbin flange 72b on the rear surface 70f side of the bobbin case 7.

Here, if the sewing operation of the sewing machine is stopped, the next path i3 is moved, but if the sewing machine is in the sewing operation, the thread unfolding body 40 and the bobbin case wait in the state of FIG. 9.

Next, the paths i3 and i4S (FIG. 10) are moved to capture the lower thread. The end position of the path i4S is set in advance so as to be the position of the open end 70e side of the bobbin case 70 at the center of both flanges 72b of the bobbin 72. After the movement of the path i4S, the linear movement of the bobbin case 70 is stopped once, and in this state, only the preset rotation amount (at least one revolution or more) is rotated so that the thread is wound.

By the above, the lower thread L caught on the cutout portion 40b of the thread spreading body 40 in the course of the path i4S is wound one or more turns at the end position of the i4S without depending on the position before the cutout portion 40b is caught. By the above, the thread winding end position of the lower thread L is slightly open from the end position of the i4S (the center of both flanges 72b), regardless of the position of the lower thread L before being caught by the cutout portion 40b during the thread guide processing. (70e side) is positioned. For this reason, it is suppressed that the lower thread L is located near both flanges 72b at the time of thread guidance processing, and the thread winding end position of the lower thread L is located near both flanges 72b. Insufficient thread guidance is suppressed. Therefore, the lower thread winding process can be performed with high reliability.

Subsequently, after the movement of the path i4 (FIG. 11), the movement of the path i5 (FIG. 11) is performed, the spreading body 40 rotates in the CCW direction, and the cutout portion 40b of the spreading body 40 is moved by a predetermined amount. . By this movement, the lower thread L extending from the bobbin case opening 70a is led to the cutout 70aa disposed at the open end of the bobbin case opening 70a.

Subsequently, the path i6 is moved, and the cutout 40b of the thread spreader 40 moves to the outside (right side in FIGS. 8 to 12) larger than the open end 70e of the bobbin case 70. This amount of movement is the amount which the clutch plate 25 which winds up touches the bobbin 72 in the half-clutch state. In this way, the cutout portion 40b of the thread spreading body 40 moves outwardly larger than the open end 70e of the bobbin case 70 so that the lower thread L extending from the bobbin case 70 is laid down ( The lower angle L of the lower thread L extending from the bobbin case 70 becomes smaller so that the lower thread L can smoothly pass between the bobbin case opening end 70e and the bobbin flange 72b.

Subsequently, as the paths i7 to i14 move, the actual spreading body 40 moves in the CCW direction by intermittent operation. In each intermittent operation from the paths i7 to i14, the bobbin 72 rotates in the same direction as the moving direction of the thread spreading body 40 by rotating in the opposite direction to the direction in which the retracting clutch plate 25 is wound. , The end position of the thread winding of the lower thread L also moves in the same direction. At this time, the amount of rotation of the bobbin 72 is set to be substantially the same as or slightly smaller than the amount of movement of the thread spreading body 40 (indicated by W1 in FIG. 11), so that looseness of the lower thread L does not occur. have.

As described above, when the thread spreading body 40 moves from the paths i7 to i14, the bobbin case opening end 70e and the bobbin flange 72b (of the bobbin case 70) are first formed by the first few intermittent operations including the path i7. The lower thread L passes between the open ends 70e side). At this time, as described above, the thread winding end position of the lower thread L is positioned from the center of both flanges 72b of the bobbin 72 toward the open end 70e of the bobbin case 70, so that the lower thread L is bobbined. It passes smoothly between the case opening end 70e and the bobbin flange 72b.

And the cutout part 40b of the spreading body 40 moves to the front (upward in FIGS. 8-12) more than the cutout part 70bb used as the inlet of the slit 70b until the movement of the path | route i14 is reached. . In this process, the lower thread L extending from the bobbin case 70 also increases the movement of the thread winding end position due to the rotation in the opposite direction to the winding direction of the bobbin 72 so as to cross the inlet of the slit 70b or the slit ( 70b) After that, the thread spreading body 40 having a moving blade moves along the path i15, and the lower thread L extending outward from the bobbin case opening end 70e is in the opposite direction (back surface 70f of the bobbin case 70). Side).

In the first embodiment, when moving the thread spreader 40 to the paths i7 to i14, the intermittent operation is performed while the bobbin 72 is rotated in the same direction (W1). By the rotation of the bobbin 72, the thread winding end position of the lower thread L also moves in the same direction as the moving direction of the thread spreading body 40, thereby increasing the reliability of guiding the lower thread L in a predetermined path.

Subsequently, as shown in FIG. 12, the real spreading body 40 moves to CW direction by the movement to the path | route i16-i36. In the intermittent operation from the paths i16 to i36, the clutch plate 25 which retracts by the preset amount rotates in the same direction as the direction in which the lower thread L is wound at the preset timing. The amount of rotation at this time is set according to the angle at which the thread spreading body 40 disposed so as to rotate freely around the circumferential side 70g of the bobbin case 70 with respect to the circumferential side 70g of the bobbin case 70. do.

By the above, during the intermittent operation of the paths i16 to i36, the bobbin 72 is rotated by the angle set in the direction in which the lower thread L is wound, and the lower thread L is pulled into the bobbin 72 to tension (Tn in FIG. 12). Where n = 1 to 9).

As described above, the movement of i16 to i36 is considered to be given a predetermined tension during the movement. In the first embodiment, T1, T2, T3, T4, T5, T6, T7, T8, and T9 when the paths i17, i20, i23, i25, i27, i29, i31, i33, and i36 move as shown in FIG. The tension is set to impart the lower thread L. FIG.

As described above, when the thread spreading body 40 moves to the paths i16 to i36, first, the cutout portion 40b of the thread spreading body 40 is slightly rearward from the inlet of the slit 70b by the first few intermittent motions (bobbin case). The lower thread L reliably passes through the slit 70b when retracted to the position of the opening 70a side).

In addition, in the process of moving the thread spreading body 40 with the moving blade in the CW direction to the path i35, the lower thread L is reliably led to the tip of the lower thread tension adjusting spring 71 along the slit 70b. In this process, since the tension Tn is properly applied to the lower thread L, the lower thread L is guided in an unfolded state. For this reason, in the process of reaching the path i36, the lower thread L enters the lower side of the lower thread tension adjusting spring 71 or becomes in a state along the side surface of the lower thread tension adjusting spring 71. In addition, since the intermittent operation is performed while applying tension (Tn. N = 1 to 9) to the lower thread L, seal failure is suppressed.

Subsequently, the yarn guidance process is started (FIG. 7 (g)).

First, processing is performed so that the lower thread L extending from the thread supply nozzle 14 enters under the lower thread tension adjustment spring 71 before the thread guide process.

As shown in Fig. 14 (a), the lower thread L follows the side surface 71aa of the distal end portion 71a of the lower thread tension adjusting spring 71 after entering the thread guide process (or the lower thread tension adjusting spring) 71) go down).

At this time, in a state where the lower thread L is captured in the cutout 40a of the thread spreading body 40 (that is, before the thread spreading body 40 is evacuated), the lower thread L of the thread supply nozzle 14 is removed. The leading end portion 14a to be derived is arranged as follows. In other words, from the tangent to the circumferential side 70c of the bobbin case 70 at the position of the terminal 70ba of the slit 70b, the tip width a of the bobbin case side 70 side and the lower tension tensioning spring 71 a. The center of the front-end | tip part 14a of the thread supply nozzle 14 is arrange | positioned within the range of (FIG. 14 (a), FIG. 5). Accordingly, the lower thread L extending from the distal end portion 14a is disposed toward the thread discharging portion 70c and along the side surface 71aa of the distal end portion 71a of the lower thread tension adjusting spring 71 at the slit 70b. . Thereafter, the thread spreading body 40 moves to the path i36, so that the lower thread L is opened from the cutout 40a of the thread spreading body 40. In this state, the bobbin 72 is rotated by rotating the take-up motor M1 and the bobbin is wound so that the lower thread L guided to the slit 70b enters under the lower thread tension adjustment spring 71 as appropriate.

As mentioned above, the process which leads this lower thread L to the thread extraction part 70c in the state which made the lower thread L extended from the thread supply nozzle 14 fall under the lower thread tension adjustment spring 71 is performed. In the first embodiment, the bobbin case 70 is linearly moved by the linear movement driving means 35 when the lower thread L is led to the thread extraction portion 70c, and at the same time, the yarn supply nozzle is driven by the nozzle rotation motor M2. By moving (14), control is performed so that both become a predetermined relative position. At the same time, the bobbin 72 is rotated by the take-up motor M1 to impart tension to the lower thread L. FIG. The above operation is predeterminedly controlled to perform "room guidance processing".

That is, as shown in FIG. 15, the front end portion 14a extending the lower thread L of the thread supply nozzle 14 is moved relative to the rear surface 70f of the bobbin case 70. Fig. 15 is viewed from the (a) top view and (b) side view (the actual feed nozzle 14 side arranged on the rear surface 70f of the bobbin case 70) in the state in which both are arranged in such a relative position. ).

Accordingly, the lower thread L is in the direction from the distal end portion 71a of the lower thread tension adjustment spring 71 toward the thread extraction portion 70c and also the tangent of the side surface 71aa of the distal end portion 71a of the lower thread tension adjustment spring 71. It is arranged to follow the direction. In the state which arrange | positioned the path | route of the lower thread L in this way, the bobbin 72 is rotated in the real winding direction, and tension is imparted by winding the lower thread L out. At this time, the rotation of the bobbin 72 is rotated by at least 90 degrees in consideration of the difference in the length of the yarn drawn out at a constant rotation angle of the bobbin 72 by the difference in the amount of yarn wound on the bobbin 72.

This tension acts in the direction to direct the lower thread L toward the thread extracting part 70c, and the lower thread L is reliably drawn to the thread extracting part 70c of the bobbin case 70 as shown in FIG. It is "room guidance". Accordingly, the lower thread (L) wound on the bobbin 72 and extended from the bobbin case 70 to the lower thread supply source enters the lower thread tension adjusting spring 71 and passes through the lower thread, and also pulls out the bobbin case 70. Guided through portion 70c.

When the lower thread L does not enter the lower thread tension adjustment spring 71 after the end of the thread spreading treatment, the bobbin case 70 and the thread supply nozzle 14 are placed at the relative positions and the lower thread L is used. By applying tension to the lower thread L, the lower thread tension reliably enters the lower thread tension adjusting spring 71 and is led to the thread extraction portion 70c.

Further, the lower thread winding device 10 of the first embodiment includes the operation of causing the aforementioned lower thread L to enter the lower thread tension adjusting spring 71 in the above thread guiding processing, and the lower thread tension adjusting spring 71 described above. It is possible to set the number of times of repeating the operation of drawing the lower thread L in the state of entering the bottom) to the thread extraction portion 70c.

After that, as shown in FIG. 13, the thread spreader 40 moves the paths i37 and i38, and returns to the initial position shown in FIG. As shown in Fig. 18, the thread supply nozzle 14 is retracted to the thread cutting position.

By the above, the real guidance process of 1st Example is complete | finished.

Subsequently, the thread cutting process is started (Fig. 7 (h)).

That is, the lower thread L is fixed to the cutout portion 40c for thread cutting by first rotating the thread spreader 40 clockwise as shown in FIG. 7 (h). And as the thread spreading body 40 continues to rotate in the clockwise direction and overlaps with the fixed blade 45, the lower thread L fixed to the thread cutting portion 40c is fixed blade 45 and the eyeball shaped part. The thread is sandwiched between 40d and the lower thread L is cut at a predetermined position to finish the thread cutting process. By the above, the lower thread automatic supply process of the lower thread automatic supply device 100 to which the lower thread winding device 10 of the first embodiment is applied is performed.

After the thread cutting, the bobbin case 70 and bobbin 72 in which the lower thread winding and the thread guide are finished by the transfer arm 33 are moved to the dummy position L1, and when the sewing operation of the sewing machine stops, the dummy position L1. ) Is mounted on the bobbin fixed shaft r1, and if it is in operation, it is waited and mounted on the shaft r1 after the operation stops.

Next, the control processing performed by the sewing machine control unit 93 in association with the control unit shown in FIG. 6 and this control unit will be described with reference to the flowcharts of FIGS. 16 to 18.

When this control process starts, a sewing operation is performed first (step S1), and it is discriminated whether or not the bobbin thread is consumed enough to require replacement of the bobbin every time the thread cutting operation of the sewing machine is performed (step S2). If it is determined in step S2 that the bobbin needs to be replaced, the flow proceeds to step S3.

Subsequently, it is determined whether the sewing operation of the sewing machine and the thread cutting operation on the sewing machine side stop based on the signal from the sewing machine control unit 93 (step S3). When the operation of the sewing machine stops, the process proceeds to step S4. If the sewing machine is in operation, it waits until the operation of the sewing machine stops.

Then, a process of outputting an operation prohibition signal to the sewing machine control unit 93 forbidding the sewing machine from moving is performed (step S4). Next, the process proceeds to step S5, and the bobbin 72 and bobbin case 70 in the drum K are moved to the residual chamber removal position L2 by the bobbin exchanger 30, and is mounted on the bobbin fixed shaft r2. The bobbin 72 and the bobbin case 70 which are attached to the dummy position L1 and which the lower thread L is wound in advance are set in the book K (step S5). When the replacement of the bobbin 72 is completed, the flow advances to step S6, and a process of outputting an operation permission signal for allowing the operation of the sewing machine to the sewing machine control unit 93 is performed (step S6). At this point, the sewing operation starts again.

Subsequently, the residual chamber removing process is performed by the residual chamber removing apparatus 110 (shown in FIG. 6) (step S7). Subsequently, it is determined whether the sewing machine is in the sewing operation (step S8), and when the operation of the sewing machine stops, the process proceeds to step S9. If the sewing machine is in operation, it waits until the operation of the sewing machine stops.

Subsequently, the bobbin 72 and the bobbin case 70 in which the lower thread L is completely removed by the carrier arm 33 and the bobbin gripping means 31 are separated from the bobbin fixing shaft r2 at the residual chamber removing position L2. (Step S9), it is conveyed to the lower thread winding position L3 (step S10).

Subsequently, a lower thread winding process is performed (step S11). This lower thread winding process is carried out as shown in the flowchart of Fig. 17 (thread T1), thread winding process (Step T2), thread spreading process (Step T3), thread guide processing (Step T4. Each process of the process (step T5) is performed. In the lower thread winding process, as described above, immediately before the thread is entangled and immediately after the start of thread unfolding, it is determined whether the operation of the sewing machine is stopped, and each process is performed only when it is stopped. If the sewing machine is in operation, wait until the operation stops.

Subsequently, the bobbin and bobbin case in which the lower thread L is wound are conveyed to the front of the dummy position L1 by the transfer arm 33 and the bobbin gripping means 31 (step S12). Subsequently, a determination process of whether the operation of the sewing machine is stopped is performed here (step S13), and when stopped, the bobbin 72 and the bobbin case 70 are mounted on the bobbin fixed shaft r1 at the dummy position L1 (step S13). S14), it waits until the bobbin 72 needs to be replaced. If the sewing machine is in operation in step S13, the operation waits until the operation stops.

Next, with reference to FIG. 18, the control of "room unfolding process" (step T3) and "room guide process" (step T4) which is a unique part of the first embodiment will be described.

That is, when the "sensation processing" shown in step T2 (FIG. 17) is complete | finished, it advances the yarn supply nozzle 14, and simultaneously winds up so that bobbin 72 may not be loosened by loosening (step U1). Moreover, the thread feeling moves the thread spreading body 40 which guided the lower thread to the cutout 40a at the time of processing (step U2).

Subsequently, the bobbin case 70 is moved to the actual capturing position by the linear movement driving means 35, and the lower thread is captured by the cutout portion 40b of the thread spreading body 40 (step U3). After capturing the lower thread, the thread spreading body 40 is moved to the thread winding position along the path i4S (shown in FIG. 10), and then stopped, and the thread winding is performed, and the thread winding end position of the bobbin thread L is changed during thread guide processing. Positioning is performed as described above (step U4).

Subsequently, the bobbin case 72 is moved in the same direction as the moving direction of the bobbin case 70 and the bobbin case 70 is moved in a predetermined direction in the CCW direction by the intermittent operation. The lower thread L is guided to the position beyond the slit 70b of the bobbin case 70 by the operation to rotate (step U5). Subsequently, in the process of returning to the CW direction while the thread spreading body 40 is intermittently operated, a predetermined tension is appropriately applied to guide the lower thread to the slit 70b (step U6).

The bobbin case is then tangential to the circumferential side 70c of the bobbin case 70 at the distal end portion 14a of the thread supply nozzle 14 at the position of the end portion 70ba of the slit 70b of the bobbin case 70. The bobbin case 70 is linearly moved, and the thread supply nozzle 14 is positioned approximately in front of the tension adjusting spring 71. Then, the lower thread L is released from the cutout portion 40b of the thread spreader 40, and then the bobbin 72 is rotated to wind the thread and the lower thread L is inserted into the lower thread tension adjustment spring 71. (Step U7).

Then, the thread supply nozzle 14 is advanced to the entangled position and the thread is wound to fix the looseness (step U8), and the cutout portion 40b of the thread spreading body 40 is moved by the linear movement of the bobbin case 70. Moves to the thread catching position, which is the position at which the lower thread is captured, and creates a space for the tip portion 14a of the thread supply nozzle 14 to overlap the back surface 70f of the bobbin case 70 during thread guidance. (Step U9).

Subsequently, the thread supply nozzle 14 is further advanced in the entangled position again, and the distal end portion 14a for extending the lower thread L is disposed so as to overlap the rear surface of the bobbin case 70. Further, the bobbin 72 is rotated to thread the yarn, to impart tension to the lower thread L, and to perform the thread guide operation of leading the lower thread to the thread extracting part 70c (step U10). Subsequently, when the lower thread is not guided to the thread extraction portion 70c of the bobbin case 70, the thread supply nozzle 14 is retracted from the position overlapping the rear surface 70f of the bobbin case 70 to the thread-entanglement position. The thread is wound to loosen (step U11). Then, it is determined whether the actual guide operation shown in steps U10 and U11 has been performed for a predetermined number of times (step U12). If the number of times is set, the process proceeds to step U13. The operation after step U10 is repeated until it reaches, and real guidance processing is performed.

Next, the bobbin case 70 is linearly moved to the thread cutting position (step U13), and the thread supply nozzle 14 is retracted to the thread cutting position (step U14). Then, the thread spreading body 40 is moved to the origin (step U15), and the process proceeds to the thread cutting process of step T5 (Fig. 17).

According to the automatic bobbin feeder 100 described above, a wiper that is a conventional configuration for "thread guidance" and a configuration for driving the wiper are unnecessary, which greatly reduces the number of parts, thereby contributing to cost reduction. In addition, since the transverse force is not applied to the lower thread, the breakage of the thread during the "thread guide process" is greatly suppressed, and the reliability of the thread guide process is greatly improved.

In addition, during the thread entanglement treatment, thread winding treatment, thread spreading treatment, thread guide treatment, and thread cutting treatment, the sewing operation of the sewing machine is stopped by the monitoring of the vibration detection unit, and is not affected by vibration. Specifically, in thread entanglement, the thread discharged from the thread supply nozzle 14 can be reliably wound around the bobbin from the opening 70a of the bobbin case 70, and the thread unfolding process, thread guide process, and thread cutting process are performed. In the present invention, an operation of guiding the thread to the thread spreading body 40 can be reliably performed. In addition, if the vibration vibrates severely in the half-clutch state performed in the present embodiment during the thread unfolding process, the clutch plate 25 may be released from the bobbin 72 and rotation may not be transmitted to the bobbin 72. Since it is performed after confirming the stop, the anti-clutch state can be easily maintained, and the thread unfolding process is reliably performed by rotating the bobbin 72 by a desired amount.

(Second embodiment)

Next, the lower thread winding apparatus of the second embodiment will be described in detail with reference to FIG.

The lower thread winding device of the second embodiment is a variation of the lower thread winding device 10 of the first embodiment, in which the lower thread L inserted under the lower thread tension adjusting spring 71 is led to the thread extracting part 70c. At the time of guiding processing, it is different from the first embodiment in that the lower thread L is captured by the guide portion 40aa of the thread spreading body 40. Therefore, the basic configuration is the same as that of the lower thread winding processing 10 of the first embodiment.

In other words, in the first embodiment, the distal end portion 14a of the thread supply nozzle 14 is disposed relative to the rear surface 70f of the bobbin case 70 in the "thread guide process". In this case, as shown in FIG. 15A, the lower thread L extending from the tip portion 14a of the thread supply nozzle 14 may partially come into contact with the circumferential side surface 70g of the bobbin case 70. Therefore, depending on the shape of the bobbin case 70 (an angled shape, etc.), a portion where the lower thread L contacts the bobbin case 70 leads the lower thread L to the thread extraction portion 70c smoothly. May be suppressed. Therefore, in the second embodiment, the thread spreading body 40 is rotated back to the lower thread L side during the "thread guide processing", and the lower thread L is captured by the guide portion 40aa of the thread spreading body 14. It is in a state. As a result, a loose angle is generated between the thread dispensing portion 70c of the bobbin case 70 in the lower thread L extending from the distal end portion 14a of the thread supply nozzle 14. In this state, the yarn is wound to give tension to the lower thread L and lead to the thread extraction portion 70c.

Therefore, in the following description, the control of "thread guide processing" different from the first embodiment will mainly be described with reference to the flowchart of the lower thread 19. FIG.

Since operation | movement of step V1-step V10 is the same as operation of step U1-U10 of FIG. 18, the description is abbreviate | omitted. Since the second embodiment differs from step V11, this portion will be described. First, the bobbin case of the front end portion 14a of the thread supply nozzle 14 is taken to take a space for the thread spreader 40 to enter so that the lower thread L is captured by the guide portion 40aa of the thread spreader 40. At a position different from the back surface 70f of 70, the moving amount corresponding to 6 ° minutes is further retracted at the rotational angle of the thread supply nozzle 14, and the thread winding to loosen is performed (step V11). ).

Subsequently, the bobbin case 70 is linearly moved to the thread cutting position to retreat (step V12), and the thread spreading body 40 is once moved to the origin (step V13). In this state, the thread spreading body 40 is moved from the origin to the thread catching position, and the thread spreading body 40 enters the space between the lower thread L and the circumferential side surface 70g of the bobbin case 70. At the same time, the lower thread L is captured by the lower thread guide incision 40a for guiding the lower thread L and the thread is wound (step V14). Subsequently, the bobbin case 70 is linearly moved to the thread catching position, and the lower thread L is brought into contact with the guide portion 40aa of the thread spreading body 40 to extend from the distal end portion 14a of the thread supply nozzle 14. (L) makes a loose angle between the thread extraction portion 70c of the bobbin case 70 and winds the thread to give tension to the lower thread L, and leads the lower thread L to the thread extraction portion 70c. (Step V15).

Although not shown, the lower thread winding apparatus 10 of the second embodiment is located near the thread guide portion 40aa of the thread spreading body 40 and the thread extracting portion 70c of the bobbin case 70 in the lower thread L described above. You may perform a thread guiding process by repeating the operation which rewinds a thread and gives tension to a lower thread L with a loose angle in between.

Then, the thread supply nozzle 14 is retracted to the thread cutting position (step V16), the bobbin case 70 is linearly moved to the thread cutting position (step U17), and the thread spreading body 40 is moved to the origin ( Step U13) The process proceeds to the actual cutting process of step T5 (FIG. 17).

According to the lower thread winding apparatus of the second embodiment, the lower thread L is captured by the guide portion 40aa of the thread spreading body 40 during the " thread guide treatment " Tension is applied to the lower thread L by making a loose angle between the thread extracting part 70c of the bobbin case 70 in the lower thread L extending from the distal end portion 14a of (14) and winding the thread in that state. Then, the lower thread L is forcibly moved in a straight line to guide the thread extraction portion 70c. Accordingly, it is possible to cope with the shape of various bobbin cases, and the thread guide processing with higher reliability.

(Third Embodiment)

Next, the lower thread winding apparatus of the third embodiment will be described in detail with reference to FIG.

The lower thread winding device of this embodiment is a modification of the lower thread winding device 10 of the first embodiment and the lower thread winding device 10 of the second embodiment, and also a wiper 200 which is a configuration of a conventional thread guide (shown in FIG. 21). , A part of the thread guide means pre-installed, and a peripheral configuration (part of the thread guide means pre-installed) for driving the wiper 200 is disposed.

In the "room guide process", the same process as the "room guide process" of the first embodiment (first room guide process), the same process as the "room guide process" of the second embodiment (second room guide process), Processing (third room guidance processing) using the wiper 200 having a conventional configuration is enabled by the CPU 82, the RAM 91, and the ROM 90 serving as the control means P, respectively. And the operator can select these three types of "room guidance processing" suitably by the display of the selection means 120 of the operation and display panel 89. As shown in FIG. That is, a suitable "thread guide process" can be appropriately selected depending on the conditions of use (characteristics such as the thickness of the thread, the shape of the bobbin case 70, etc.).

Therefore, other basic configurations are the same as those of the lower thread winding apparatus 10 of the first embodiment. In the following description, the block diagram shown in FIG. 20 is mainly described, and the same components are denoted by the same reference numerals and the description thereof is omitted. do.

As shown in FIG. 20, the wiper 200 is connected to the I / O port 81 through the driver 201, and the I / O port 81 is connected to the CPU 82. In addition, the operation and display panel 89 selects the same processing as the "room guidance processing" in the first embodiment, the same processing as the "room guidance processing" in the second embodiment, and a process using the wiper 200 having a conventional configuration. The display field of the selection means 120 is arranged. This selecting means 120 is connected to the CPU 82 through the I / O port 81. Accordingly, the operator can select an appropriate treatment among these three treatments according to the use conditions.

Next, in the lower thread winding apparatus of the third embodiment, the control of " thread spreading process " and " thread guide process " is selected by the selecting means 120, for example, when the same process as that of the first embodiment is selected. Control is the same as that of the second embodiment, and the same control as that of the second embodiment is performed. In addition, when the same process as the conventional process using the wiper 200 is selected, it is controlled similarly to the conventional process mentioned above.

According to the lower thread winding apparatus of the third embodiment, the same effects as those of the first embodiment, the second embodiment, and the wiper 200 can be obtained, and the characteristics of the yarn and the shape of the bobbin case 70 can be obtained. According to the conditions of use, an appropriate "real guidance processing" can be appropriately selected.

In addition, this invention is not limited to the said Example. That is, of course, it can change suitably in the range which does not deviate from the summary of this invention.

According to the invention of Claim 1, the wiper which is a structure for the conventional "thread guidance" and the structure for driving this wiper are unnecessary, which can greatly reduce the number of parts and contribute to cost reduction. In addition, since the transverse force is not applied to the lower thread, the thread cutting during the "thread guide processing" is greatly suppressed, and the reliability of the thread guide processing is greatly improved.

According to the invention of claim 2, the reliability of each processing (real guide processing or the like) is further enhanced in the lower thread winding processing.

According to the invention of claim 3, in the lower thread winding process, the reliability of each process (real guide process or the like) is further improved.

According to the invention of claim 4, it is possible to control these variables appropriately for each process, and a more reliable lower thread winding device can be obtained.

According to the invention of claim 5, the thread easily enters the lower thread tension adjusting spring. In addition, the above operation is repeated at least once, further increasing the reliability of the process.

According to the invention of claim 6, it is possible to make the lower thread tension adjustment spring enter the bottom without being restrained by the movement of the lower thread by touching the peripheral member.

According to the invention of claim 7, the lower thread extending from the lower thread supply source to the bobbin case is reliably guided to the thread extraction portion disposed on the circumferential side of the bobbin case.

According to the eighth aspect of the present invention, it is possible to cope with a change in the actual path from the bobbin opening to the portion of the thread spreading member that catches the lower thread of the thread spreading member due to the positional noise of the thread spreading member.

According to the invention of claim 9, the thread extending from the bobbin case wound on the bobbin to the lower thread supply source passes through the lower thread tension adjusting spring of the bobbin case, and is guided to the thread extracting part of the bobbin case, so that the thread guide treatment is performed with high reliability. Is done.

According to the invention of claim 10, the lower thread is caught in the thread spreading member so that the lower thread extending from the lower thread supply means is prevented from contacting the circumferential side surface of the bobbin case, so that the bobbin case of various shapes can be coped. Therefore, the reliability of the lower thread winding process becomes higher.

Claims (10)

A lower thread supply means having a leading end which derives the lower thread from the lower thread supply source and is movable to a desired position; Bobbin rotating means having a rotary body that is foldable to the bobbin accommodated in the bobbin case, and for rotating the bobbin coupled by the rotation of the rotor, Direct moving means for folding the rotating body to the bobbin accommodated in the bobbin case, Lower thread winding device having a thread spreading member wound around the bobbin and extending from the bobbin case opening to the lower thread supply means and guiding the thread path of the thread from the opening to a slit disposed on the circumferential side of the bobbin case. To Control means for relatively moving the tip of the lower thread feed means and the bobbin case retracting position by one or both of the bobbin case in the circumferential direction or the axial direction of the bobbin case or the synthetic direction thereof; And a tension imparting control means for imparting tension to the thread by rotating the bobbin in a predetermined direction by the bobbin rotating means during thread guidance. The method of claim 1, Lower relative winding device, characterized in that the relative movement and the tension is applied to the yarn simultaneously or independently. The method of claim 1, And the relative movement and tensioning of the yarn are intermittently performed. The method of claim 1, The amount of movement of the tip of the lower thread supply means; The movement amount of the linear movement means, Lower bobbin winding device, characterized in that the variable amount independent of the tension imparted to the bobbin rotation means and the yarn by the relative movement. The method of claim 1, When the thread extending from the bobbin case guided to the slit disposed on the circumferential side of the bobbin case passes under the lower thread tension adjusting spring disposed on the bobbin case, And the tip end portion is disposed on the opposite side to the open end of the bobbin case and inside the outer diameter of the bobbin case from the center line of the thread extracting portion arranged on the circumferential side of the bobbin case. The method of claim 1, The tip of the thread spreading member is guided to the slit of the bobbin case and the bobbin is rotated at the same time as the tip is disposed from the tangent of the slit end to the bobbin case and the tip width of the lower thread tension adjusting spring until the thread guide member is evacuated. Lower thread winding device, characterized in that the means catch the looseness of the lower thread. The method of claim 1, The thread spreading member is guided to the slit and then retracted to open the thread, and after opening the thread, the lower thread extending from the bobbin thread supply source to the bobbin case is led to the thread leading part arranged on the circumferential side of the bobbin case. At least 90 ° by the bobbin rotating means, the lower thread winding device characterized in that for rotating the bobbin in the real winding direction. The method of claim 1, The thread spreading member guides the thread path of the thread to the slit by intermittent operation, A lower thread winding device, characterized in that a tension is applied to a thread by said bobbin rotation means every predetermined number of intermittent motions when the thread is unrolled after completion of bobbin winding to bobbin. The method according to any one of claims 1 to 8, The bobbin case includes a lower thread tension adjusting spring disposed on the circumferential side, and a thread extracting part disposed on the circumferential side of the lower thread tension adjusting spring at which the tip ends thereof overlap. Relative movement of the bobbin case and the lower thread supply tip so that the thread wound on the bobbin and extending from the bobbin case to the lower thread supply source passes under the bobbin case lower tension adjustment spring and is guided to the thread ejection part of the bobbin case. Lower thread winding device characterized in that the tension is controlled. The method of claim 1, The bobbin case includes a lower thread tension adjusting spring disposed on the circumferential side, and a thread extracting part disposed on the circumferential side of the lower thread tension adjusting spring at which the tip ends thereof overlap. The thread is caught by the thread spreading member and the tension is applied to the thread in a state where the tip of the lower thread supply means is disposed opposite the open end of the bobbin case from the center line of the thread extraction portion disposed on the circumferential side of the bobbin case. By And a thread wound on the bobbin and extending from the bobbin case to the lower thread supply source is controlled to pass through the lower thread tension adjusting spring of the bobbin case and to be guided to the thread extracting part of the bobbin case.