TWI489021B - Sewing machine under the line supply device - Google Patents

Description

Sewing machine lower line supply device

The present invention relates to a lower thread supply device for a sewing machine, which is provided with a horizontal kettle that detachably houses a lower thread reel, and can be easily provided at the time of sewing.

In the sewing machine for home use, it is a mainstream model in which a horizontal tank is installed in a state in which the horizontal drum is not required to be stored in the reel housing. In the case of a sewing machine equipped with a horizontal tank, since the lower thread reel is inserted into the inner tank from the upper opening of the horizontal tank, the lower thread supply device is provided and the lower thread can be reliably supplied.

For example, in Patent Document 1, the cylindrical container-shaped accommodating portion of the inner pot is located below the lower thread reel accommodating opening provided in the needle plate. The user directly inserts the lower thread reel from the upper thread reel storage opening into the inner kettle from above and accommodates it. Therefore, as in the case of using the vertical kettle, in the state in which the lower thread reel is housed in the reel case, it is not necessary to be provided in the kettle, and the operation of providing the lower thread reel can be easily performed.

The lower wire supply device is provided with a tension generating portion that gives a pull-out impedance to the lower wire drawn from the lower wire spool. The tension generating portion is attached to a concave portion formed along a portion of the inner peripheral surface of the accommodating portion of the inner pot in a state in which the wire adjusting plate is overlapped with the wire adjusting plate spring. The user inserts the lower thread reel as described above, and the lower thread pulled out by the lower thread reel passes the operation of the tension generating portion. When the lower thread is incorrectly operated by the tension generating unit and the sewing machine is actuated as a result, the tension of the lower thread is weakened, the supply amount of the lower thread is excessively large, and the balance with the upper thread is broken, so that the sewing operation cannot be performed.

In the above, in the above-described tension generating portion of the inner cylinder, the lower thread drawn from the lower thread reel is guided to a guide member having a plate shape substantially arranged in the horizontal direction. The pulled down line is guided by the guide member provided above the tension generating portion and moved. The lower wire linear adjustment plate and the wire adjustment plate spring are positively induced and introduced into the tension generating portion. Therefore, the user guides the lower thread pulled out from the lower thread reel along the edge of the needle board to set the lower thread by a simple operation.

[Patent Document 1] Japanese Patent Publication No. 10-1146489

[Patent Document 2] JP-A-2005-312733

However, in Patent Document 1, only the other guide members are required to guide the lower thread, and the structure of the lower thread supply device may become complicated. Further, in Patent Document 2, it is not necessary to provide another guide member, and the shape of the needle plate is processed into an appropriate shape in accordance with the shape and position of the lower thread reel. However, since it is difficult to reduce the manufacturing cost and the household sewing machine which requires a large price competitiveness, it is desirable to have a simpler construction.

In view of the above, it is an object of the present invention to provide a lower thread supply device for a sewing machine which reliably provides tension to the lower thread and which is simple in construction.

In order to achieve the above object, the lower thread supply device of the sewing machine according to the first aspect of the invention is provided in the inner cylinder of the horizontal tank of the sewing machine housing, and the lower thread reel accommodating opening is detachably received, and the wire adjusting plate and the wire adjusting plate spring are along the line. The inner circumference of the inner kettle is installed in a state of being overlapped, and tension is generated. And a lower wire which is led out between the wire adjusting plate and the wire adjusting plate spring, and applies an impedance to the drawing of the lower wire, and has a needle plate which is disposed above the inner kettle and has the lower thread reel In the opening portion, the needle plate has an inducing slit for inducing a lower line, and the inducing slit is formed in a straight line shape and has an inclined angle in an extending direction of a portion where the wire adjusting plate and the wire adjusting plate spring overlap, and is externally connected In the direction of the lower thread reel, the inclination angle is substantially the same as the direction in which the lower thread is pulled out.

In the first aspect of the invention, the lower thread reel is detachably accommodated in the inner cylinder of the horizontal tank provided in the sewing machine housing through the lower thread storage opening. The wire adjusting plate and the wire adjusting spring are attached to the inner tub in a state where the inner circumference is heavy, and a tension generating portion that gives a pull-out impedance between the wire adjusting plate and the wire adjusting plate spring is given. Above the inner kettle, a needle plate having an opening and closing opening for the lower thread is provided, and an induction slit for inducing the lower thread is formed on the needle plate. The inducing slit is formed in a straight line shape and has an inclined angle in a direction in which the line adjusting plate overlaps the line adjusting spring, and is inclined to the direction in which the lower line is pulled out in a direction circumscribing the lower thread reel. Consistently, the user moves the lower line along the induction slit on the upper side of the inner tank that accommodates the lower thread reel, and the lower line can be induced to the portion where the line adjustment plate and the line adjustment spring overlap, giving the lower line a moderate tension. However, even if other guide members are not provided, it is possible to provide a moderate tension to the lower thread without detracting from the function, and to provide the lower thread supply device only by a simple manufacturing process of forming a slit that is slightly linear on the needle plate. Can reduce manufacturing costs.

According to a second aspect of the invention, in the second aspect of the invention, the needle plate includes a tangential portion, and the length of the lower thread drawn from the lower thread reel is longer than the length of the end of the induction slit. The position is cut off the line.

In the second aspect of the invention, the tangential portion is provided, and the lower line is cut at a predetermined position that is longer than the length of the lower end of the induction slit from the lower thread drawn from the lower thread reel. When the length of the lower thread pulled out from the lower thread reel is long, the possibility that the lower thread pulled out from the front end of the outer kettle is complicatedly wound with the upper thread becomes high, and in the case of a short case, the front end of the outer kettle catches the lower thread and is damaged. There is also a possibility that the user can easily set the lower line by reliably cutting the lower line to an appropriate length.

According to the present invention, the user moves the lower thread along the induction slit from the upper surface side of the inner tank that accommodates the lower thread reel, whereby the lower thread can be induced to the portion where the line adjustment plate and the wire adjustment spring overlap, giving a moderate tension to the lower thread. However, even if other guide members are not provided, it is possible to provide a moderate tension to the lower thread without detracting from the function, and to provide the lower thread supply device only by a simple manufacturing process of forming a slit that is slightly linear on the needle plate. It does not increase the number of components and can reduce manufacturing costs.

Hereinafter, the present invention will be described based on the drawings showing the embodiment. In the following description, the front, rear, left and right of the operation of operating the sewing machine will be described as front, rear, left, and right. Fig. 1 is a perspective view showing the appearance of a sewing machine according to an embodiment of the present invention. As shown in Fig. 1, the sewing machine of the above-described embodiment forms a sewing table 12 with a part of the sewing machine frame 11, above the sewing table 12. An arm portion 13 integrally formed with the sewing machine frame 11 is provided. A needle bar 15 to which the needle 14 is attached is provided at a lower portion of the front end of the arm portion 13, and the needle bar 15 is moved up and down by a conventional drive mechanism (not shown) to perform sewing.

Metal is provided on a portion that is sewn toward the needle bar 15 The needle plate 16 is made. Fig. 2 is a plan view showing a needle plate 16 of an embodiment of the present invention. A pinhole 16a through which the needle 14 is inserted is formed in the needle plate 16, and a lower wire receiving port 17 having a rectangular opening is formed on the front side of the pinhole 16a. In normal use, the lower thread receiving opening 17 is covered by a transparent cover 18 (Fig. 1). Below the needle plate 16 in the sewing machine frame 11, a feed mechanism (not shown) for feeding is driven in accordance with the vertical movement of the needle bar 15, and the lower thread supply device of the present embodiment is provided.

Fig. 3 is a plan view showing the structure of the lower thread supply device according to the embodiment of the present invention. Fig. 3 is a plan view showing the outer cover 18 removed from the upper side with the lower thread take-up opening 17 open. The lower thread supply device of the present embodiment is formed by arranging the horizontal tank 30 below the needle plate 16. The horizontal tank 30 is composed of an outer tank 29 that rotates in the horizontal direction in synchronization with the vertical movement of the needle bar 15, and an inner pot 20 that is accommodated in the outer tank 29 and does not rotate in synchronization with the outer tank 29. The outer tank 29 retracts and captures the front end (not shown) of the lower thread, and the upper thread and the lower thread are wound in accordance with the vertical movement of the needle bar 15, thereby forming a suture.

Fig. 4 is a perspective view showing the structure of the inner pot 20 of the embodiment of the present invention. As shown in Fig. 4, the inner pot 20 has a substantially cylindrical container shape, and has a housing portion 20a that can accommodate the lower thread reel 21 from below the lower thread reel housing opening 17. Then, the lower thread reel 21 is detachably fitted into the accommodating portion 20a through the lower thread reel receiving opening 17. Moreover, the finger-hanging recessed part 20c for taking out the accommodated lower thread reel 21 is provided in the outer peripheral part of the accommodating part 20a.

The inner pot 20 is provided with a tension generating portion 22. The tension generating portion 22 is attached to a circle of a part of the inner circumferential surface of the accommodating portion 20a of the inner cylinder 20 by, for example, bolts 25 and 26 in a state in which the wire adjusting plate 24 is overlapped with the wire adjusting spring 24, for example. An arc-shaped recess 20d. The wire adjusting plate 23 and the wire adjusting spring 24 are formed in the same arc shape along the concave portion 20d, and the portion where the wire adjusting plate 23 overlaps the wire adjusting spring 24 is an arc that is fitted into the inner circumferential surface of the housing portion 20a of the inner pot 20. a recess 20d.

Fig. 5 is a front elevational view of the wire adjusting plate 23 according to the embodiment of the present invention. In the fifth embodiment, the wire adjusting plate 23 is formed with a hole 23a in the lower left portion, and a slit 23b that extends obliquely downward to the left from the center of the upper edge to form a communication hole 23a. Further, in the vicinity of the hole 23a on the left side of the upper edge, a groove portion 23c for stably pulling the lower wire introduced into the hole 23a from the pin hole 16a of the needle plate 16 is provided.

The wire adjusting spring 24 is provided with a segment portion 24a at the right end portion, between the wire adjusting plate 23 and the wire adjusting spring 24, and a slight gap in the center portion (portion near the starting end of the slit 23b), and the left end portion (hole) The portion near 23a) forms a substantially close state.

With such a configuration, the lower thread pulled out from the lower thread reel 21 is induced to the hole 23a along the slit 23b. Therefore, the lower wire resistance force is given by the clamping force of the wire adjusting plate 23 and the wire adjusting spring 24, and is supplied in a state in which the lower thread is given a moderate tension.

In the present embodiment, as shown in Figs. 2 and 3, the needle plate 16 is provided with a substantially linear induction slit 27. The inclination angle of the induction slit 27 is substantially the same as the direction circumscribing the lower thread reel 21, that is, the direction in which the lower thread is pulled out. Specifically, the wire adjusting plate 23 and the wire adjusting spring 24 which are provided in an arc shape on the inner circumferential surface of the inner pot 20 are provided with an inducing slit 27 in a direction extending toward the main body side. Thereby, the user does not think that the lower thread is induced to the groove portion 23c above the wire adjusting plate 23, but is induced only along the induction slit 27, and is adjusted by the wire. The plate 23 is placed between the wire adjustment spring 24 and gives a moderate tension to the lower thread.

Further, a tangential portion 28 is provided on the needle plate 16. The tangential portion 28 includes a bottomed groove 28a formed along the outer edge of the needle plate 16 from the end of the induction slit 27, and a cutting edge incision portion 28c that induces the lower line to the cutting edge 28b at a position where the length of the lower thread is sufficiently secured.

When the sewing machine having the lower thread supply device having the above-described structure is used, the user first removes the cover 18 of the sewing table 12, and inserts the lower thread reel into the housing portion 20a of the inner pot 20. Then, the lower thread is pulled out from the lower thread reel 21, and the slit 23b of the wire adjusting plate 23 is first hung.

Next, the lower thread is rotated clockwise in the state of the slit 23b, and the lower thread is induced to the direction of the induction slit 27 of the needle plate 16. By inducing the lower line in the direction of the induction slit 27, the lower line hanging on the slit 23b descends along the slit 23b, and is induced to the hole 23a.

The lower thread is induced to the hole 23a, and the lower thread is brought into a state in which the tension is applied by the tension between the wire adjusting plate 23 and the wire adjusting spring 24. The user is pulled along the slit 27 while giving the lower thread a proper tension.

At the end portion of the induction slit 27, the lower line is induced toward the bottomed groove 28a of the needle plate 16, so that the bottomed groove 28a formed from the end portion of the induction slit 27 along the outer edge of the needle plate 16 induces the lower line to the cut line. Blade 28b. At the time when the lower thread enters the cutting edge incision portion 28c, the lower thread is cut by the cutting edge 28b.

In this state, the user moves the needle bar 15 up and down by a drive mechanism (not shown). By moving up and down, the outer kettle 29 of the horizontal kettle 30 is horizontally rotated, and the upper thread is caught by the front end and wound with the lower thread, and is pulled out from the needle hole 16a of the needle plate 16 to the upper surface. In this state, since the lower line is taken from the wire adjustment plate 23 of the inner kettle 20 The cymbal L23a is pulled out from the pinhole 16a via the groove portion 23c, and the user does not have to think that the lower thread is induced to the groove portion 23c. Prepare the sewing by disassembling the pulled upper and lower threads.

In the present embodiment, the length of the drawn lower thread can be kept substantially constant. Therefore, when the length of the lower thread pulled out from the lower thread reel 21 is too long, the lower thread and the upper thread pulled out by the front end of the outer cylinder 29 are not complicatedly wound. Moreover, when it is too short, the front end of the outer kettle 29 catches a lower line without damage, and a user can prepare|seat reliably.

According to the present embodiment, the lower thread drawn from the lower thread reel 21 is rotated in the clockwise direction while the upper surface side of the inner cylinder 20 is hung in the slit 23b, and is moved along the induction slit 27 of the needle plate 16 to operate. The lower thread is induced between the wire adjusting plate 23 and the wire adjusting spring 24 to pass through the tension generating portion 22. Therefore, it is not necessary to separately provide, for example, a bow-shaped guiding member or the like, and the lower thread can be surely set, and the lower thread can be surely set. Since the inducing slit 27 is slightly linear, the processing is also completed to a minimum. Therefore, the manufacturing cost can be reduced.

Further, in the present embodiment, since the tangential portion 28 is provided in the needle plate 16, the length of the lower thread pulled out from the lower thread reel 21 is substantially constant, and it is possible to prevent the problem that the length of the drawing is not uniform.

In addition, the above-described embodiment can be variously modified without departing from the scope of the present invention. For example, the detail of the structure of the tension generating unit 22, the shape of the wire adjusting plate 23, and the tangential portion 28 can be additionally changed. Changes in installation location, etc.

11‧‧‧Sewing machine frame

16‧‧‧ needle board

17‧‧‧Underline reel vent

20‧‧‧ Inside the kettle

21‧‧‧Downline reel

22‧‧‧Tension Generation Department

23‧‧‧Line adjustment board

24‧‧‧Line adjustment spring

27‧‧‧Induction slit

28‧‧‧cutting department

29‧‧‧External kettle

30‧‧‧ horizontal kettle

Fig. 1 is a perspective view showing the appearance of a sewing machine of the present embodiment.

Fig. 2 is a plan view showing a needle plate of an embodiment of the present invention.

Fig. 3 is a plan view showing the structure of a lower thread supply device of an embodiment of the present invention.

Fig. 4 is a perspective view showing the structure of an inner kettle of an embodiment of the present invention.

Fig. 5 is a front elevational view showing a wire adjusting plate of an embodiment of the present invention.

16‧‧‧ needle board

17‧‧‧Underline reel vent

20‧‧‧ Inside the kettle

21‧‧‧Downline reel

22‧‧‧Tension Generation Department

27‧‧‧Induction slit

28‧‧‧cutting department

29‧‧‧External kettle

30‧‧‧ horizontal kettle

Claims (2)

A lower thread supply device for a sewing machine detachably houses a lower thread in an inner cylinder of a horizontal tank provided in a sewing machine housing, and a wire adjusting plate and a wire adjusting plate spring are along an inner circumference of the inner cylinder Mounted in a state of being overlapped, and provided with a tension generating portion for applying an impedance to the lower wire drawn between the wire adjusting plate and the wire adjusting plate spring, and having a needle plate provided on the needle plate The upper portion of the inner pot has an opening portion into which the lower thread reel enters and exits, and the needle plate has an inducing slit for guiding the lower thread, and the inducing slit is formed in a direction in which the line adjusting plate overlaps with the line adjusting plate spring. It is linear and has an inclined angle, and in the direction circumscribing the above-mentioned lower thread reel, the inclination angle is substantially the same as the direction in which the lower thread is pulled out. The lower thread supply device for a sewing machine according to the first aspect of the invention, wherein the needle plate has a tangential portion, and a length of the lower thread drawn from the lower thread reel is longer than a length of the end of the induction slit. Cut off the line.