Thread stand device and sewing machine

Abstract

To provide a yarn standing device capable of holding a yarn with good workability and a sewing machine.SOLUTION: A yarn standing device 2 has a yarn standing rod 3 to which a yarn reel 10 is fitted, a yarn hooking base 16 on which a yarn 9 wound around the yarn reel 10 is hooked, and a yarn holding slider 21 that can slide with respect to the yarn hooking base 16 and slides between a first position to cover a yarn hooking part 8 on which the yarn is hooked of the yarn hooking base 16 and a second position to expose the yarn hooking part 8. A yarn 9 hooked on the yarn hooking part 8 is held by sliding the yarn holding slider 21 to the first position.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a thread guiding device and a sewing machine provided with this thread guiding device.

Background Art

[0002] A lockstitch sewing machine forms a stitch by intertwining an upper thread and a lower thread. Generally, the upper thread is wound around a thread bobbin, and a thread guiding rod is provided on the sewing machine. Then, the thread bobbin is placed on the thread guiding rod to supply the upper thread to the sewing needle.

[0003] Conventionally, in the case of performing multi-color pattern sewing, embroidery sewing, etc., a thread guiding device having a plurality of thread guiding rods that can be installed in advance with replacement thread bobbins and can be installed near the sewing machine or attached to the sewing machine itself is known. For example, Patent Document 1 shows a thread guiding device including a plurality of thread guiding rods (16) into which a plurality of thread bobbins can be inserted and a thread stand (spool stand (1)). This spool stand (1) is provided with the same number of thread holding portions (30) in the vicinity of a plurality of guide portions (21) for hanging the thread, and assists the thread change operation by holding the unused upper thread with the thread holding portion (30).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Incidentally, the above-mentioned thread holding part (30) holds the thread by clamping it between an elastic O-ring (32) and a mounting part (31) into which the O-ring (32) is fitted. That is, in order to hold the thread by the O-ring (32) and the mounting part (31), it is necessary to apply a predetermined tension to the thread to keep the upper thread taut and insert it between the O-ring (32) and the mounting part (31). Here, when an operator tries to insert the thread between the O-ring (32) and the mounting part (31) while holding the thread end, since the other end of the thread is a thread bobbin that supplies the thread, simply holding the thread end cannot apply a predetermined tension to the thread, and it is necessary to hold another part of the thread to keep the thread taut.

[0006] When holding the upper thread with the O-ring (32) and the mounting part (31) in this way, the work has to be done while holding the thread with both hands, and there is room for improvement in terms of workability.

[0007] In view of such problems, an object of the present invention is to provide a thread stand device capable of holding a thread with good workability and a sewing machine including this thread stand device.

Means for Solving the Problems

[0008] In a thread stand device of a sewing machine including a thread stand rod for inserting a thread bobbin and a thread hanging base for hanging the thread wound around the thread bobbin, a thread holding slider that is slidable with respect to the thread hanging base and moves between a first position that covers a thread hanging part of the thread hanging base where the thread is hung and a second position that exposes the thread hanging part is provided, and by sliding the thread holding slider to the first position, the thread hung on the thread hanging part is held. which the thread holding slider has an engaging portion that engages with the thread hanging base, and the thread hanging base includes a first engaging portion that engages with the engaging portion to hold the thread holding slider at the first position and a second engaging portion that engages with the engaging portion to hold the thread holding slider at the second position It is characterized by the above.

[0010] Also, in such a thread stand device, it is preferable to include a plurality of the thread hanging parts and the same number of the thread holding sliders as the thread hanging parts, and the plurality of the thread holding sliders are individually slidable with respect to the thread hanging base.

[0011] Also, in such a thread guiding device, it is preferable that the thread holding slider includes a knob that serves as a finger grip when sliding the thread holding slider with respect to the thread hanging base, a groove provided in the knob, and a cutting blade that cuts the thread inserted into the groove.

[0012] The present invention is also a sewing machine including any of the above-described thread guiding devices.

Effects of the Invention

[0013] According to the thread guiding device of the present invention, it is not necessary to hold the thread with both hands and apply tension thereto as in the prior art, and the holding and releasing of the thread can be switched by sliding the thread holding slider. That is, since the operation of sliding the thread holding slider with one hand suffices, the workability is improved as compared with the conventional thread guiding device that requires work with both hands.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0015] Hereinafter, with reference to the drawings, an embodiment of a bobbin device according to the present invention and an embodiment of a sewing machine including this bobbin device will be described. In the present specification, the right, left, front, rear, upper, and lower directions are the directions as viewed from a user who uses the sewing machine 1 when the sewing machine 1 of the present embodiment is installed on a workbench. Also, the X-axis direction, Y-axis direction, and Z-axis direction in the following description are the front-rear direction, left-right direction, and up-down direction, respectively, as shown in the drawings.

[0016] First, an overview of the sewing machine 1 and the bobbin device 2 of the present embodiment will be described with reference to FIG. 1. As shown in FIG. 1, the bobbin device 2 of the present embodiment is attached to and used with the sewing machine 1.

[0017] The bobbin device 2 includes a bobbin base 4 having a plurality of columnar bobbin rods 3 provided on its upper surface. The bobbin base 4 is provided with a mounting hole 5 penetrating it in the front-rear direction, and the bobbin base 4 can be fixed to the sewing machine 1 by means of screws (not shown) inserted into the mounting hole 5. Further, on the upper surface of the bobbin base 4, a support column 6 extending upward is provided, and at the upper end of the support column 6, a thread-hanging antenna 7 extending in the left-right direction is provided. The thread-hanging antenna 7 is provided with the same number of thread-hanging portions 8 as the bobbin rods 3 (five in the present embodiment).

[0018] The thread 9 used as the upper thread in the sewing machine 1 is wound around a thread bobbin 10. Then, the thread bobbin 10 is inserted onto the bobbin rod 3, and the thread 9 drawn out from the thread bobbin 10 is inserted into the needle hole of the needle 11 via a predetermined part in the sewing machine 1 through the thread-hanging portion 8, thereby completing the preparation for sewing. After that, by driving the sewing machine 1, the thread 9 inserted into the needle 11 and the lower thread (not shown) are intertwined to form a stitch.

[0019] As shown in FIG. 1, the sewing machine 1 of the present embodiment includes an embroidery frame driving device 12. The embroidery frame driving device 12 can move the carriage 14 in the X-axis direction and the Y-axis direction via the YX driving arm 13. An embroidery frame 15 can be attached to the carriage 14. Then, by fixing a cloth or the like to the embroidery frame 15 and performing sewing while moving the carriage 14, embroidery can be applied to the cloth or the like. By preparing a plurality of bobbin cases 10 wound with threads 9 of a plurality of colors, inserting each bobbin case 10 into the thread stand 3, and performing sewing while exchanging the threads 9, colorful embroidery can be applied to the cloth or the like.

[0020] Next, the thread hanging portion 8 and the structure around the thread hanging portion 8 will be described in detail. As shown in FIGS. 2 and 3, the thread hanging portion 8 of the present embodiment has an elliptical through-hole portion that penetrates the thread hanging base 16, which is a flat portion of the thread hanging antenna 7, in the front-rear direction, and a through-groove portion that obliquely extends from the upper part of this through-hole portion to the upper right side and cuts out the upper end of the thread hanging antenna 7. The shape of the thread hanging portion 8 is not limited to the illustrated shape, and for example, it may be a shape composed of only the through-hole portion or only the through-groove portion. In FIG. 3, a part of the member is cut away for illustration purposes.

[0021] Furthermore, the thread hanging base 16 includes a slide groove 18 that penetrates the thread hanging base 16 in the front-rear direction and linearly extends in the left-right direction below the thread hanging portion 8, and a first positioning convex portion 19 and a second positioning convex portion 20 that partially protrude forward with the front surface of the thread hanging base 16 facing forward. Similar to the thread hanging portion 8, five slide grooves 18, first positioning convex portions 19, and second positioning convex portions 20 are provided for the thread hanging base 16, respectively.

[0022] A thread-engaging base 16 has a thread-holding slider 21 attached thereto. In the present embodiment, five thread-holding sliders 21 are attached to the thread-engaging base 16. The thread-holding slider 21 is shaped such that its cross-sectional shape is a vertically long rectangular frame as shown in FIG. 5 (see FIG. 5), and the thread-engaging base 16 is inserted into the inner hole. In a state where the thread-holding slider 21 is inserted into the thread-engaging base 16, as shown in FIG. 5, there is a gap of 2×δ in the front-rear direction between the inner hole of the thread-holding slider 21 and the thread-engaging base 16. Here, δ is set to be approximately the same as the outer diameter of the thread 9.

[0023] As shown in FIG. 3, the thread-holding slider 21 is provided with a circular pin hole 22 penetrating it in the front-rear direction. A columnar slide pin 23 is inserted into the pin hole 22, and thereby the slide pin 23 is held by the thread-holding slider 21. Note that the slide pin 23 is also inserted into the slide groove 18 when being inserted into the pin hole 22. That is, the relative movement of the thread-holding slider 21 in the vertical direction is restricted by the slide pin 23 inserted into the slide groove 18, and the slide pin 23 can be relatively moved in the left-right direction within a range from the left end portion to the right end portion of the slide groove 18. In the present embodiment, the position where the thread-holding slider 21 is moved to the left and the slide pin 23 reaches the left end portion of the slide groove 18 corresponds to the "first position" in this specification, and the position where the thread-holding slider 21 is moved to the right and the slide pin 23 reaches the right end portion of the slide groove 18 corresponds to the "second position" in this specification.

[0024] On the front wall of the thread holding slider 21, positioning holes 24 are provided as shown in FIG. 3. When the thread holding slider 21 is moved to the left with respect to the thread mounting base 16 and the slide pin 23 reaches the left end of the slide groove 18, the positioning hole 24 engages with the first positioning projection 19, whereby the thread holding slider 21 is positioned with respect to the thread mounting base 16. Further, when the thread holding slider 21 is moved to the right and the slide pin 23 reaches the right end of the slide groove 18, the positioning hole 24 engages with the second positioning projection 20, whereby the thread holding slider 21 is positioned with respect to the thread mounting base 16. Here, the engaging force between the first positioning projection 19 or the like and the positioning hole 24 does not need to be so large, and it is sufficient that the first positioning projection 19 or the like and the positioning hole 24 engage or disengage by applying a slight force to the thread holding slider 21. Note that the positioning hole 24 of the present embodiment corresponds to the "engaging portion" in this specification. Similarly, the first positioning projection 19 corresponds to the "first engaging portion", and the second positioning projection 20 corresponds to the "second engaging portion".

[0025] Furthermore, on the rear wall of the thread holding slider 21, a knob 25 protruding from the front to the rear is provided. Inside the knob 25, a cutting blade 26 having a blade portion at the lower end is provided. Further, the knob 25 is provided with a groove portion 27 that notches the knob 25 from below to above to expose the lower end portion of the cutting blade 26.

[0026] The sewing machine 1 configured by such members is used, for example, in the state shown in FIG. 1. FIG. 1 shows a state in which the bobbin 10 is inserted into the three thread guides 3 on the right side, and the threads 9 pulled out from each bobbin 10 are held by the thread holding sliders 21 positioned above each thread guide 3. A detailed description regarding the point of holding the thread 9 by the thread holding slider 21 will be given later.

[0027] Also, the thread 9 of the bobbin 10 inserted into the fourth thread stand 3 from the right side in FIG. 1 passes through the thread hanging portion 8 located above this thread stand 3, passes through a predetermined part in the sewing machine 1, and is inserted into the needle hole of the needle 11. Thereby, the preparation for sewing with this thread 9 is completed. When the shape of the thread hanging portion 8 is only a through hole, when preparing for sewing, since it is necessary to insert the thread end of the thread 9 into this through hole from the front side to the rear side, there is a difficulty in terms of workability. On the other hand, the thread hanging portion 8 of the present embodiment has a shape combining an elliptical through hole portion and a through groove portion that notches the upper end of the thread hanging base 16. Since the thread 9 in a state stretched in the front-rear direction can be passed through this through groove portion to pass the thread 9 through the through hole portion, it is excellent in workability. Also, as shown in FIG. 2, the elliptical through hole portion is connected to the through groove portion at its upper part. And the through hole portion is located above the part through which the thread 9 passes toward the bobbin 10 and the needle 11. That is, since the thread 9 from the bobbin 10 through the thread hanging portion 8 toward the needle 11 passes through the lower side of the elliptical through hole portion in the thread hanging portion 8, when driving the sewing machine 1 to perform sewing, the thread 9 does not accidentally come out from the through groove portion in the thread hanging portion 8.

[0028] Here, the fourth thread holding slider 21 from the right side in FIG. 1 has moved to the right as shown in FIG. 4(a), and the positioning hole 24 shown in FIG. 3 is in a state of engaging with the second positioning convex portion 20. That is, since the thread holding slider 21 does not move unintentionally, it is possible to prevent problems such as the thread holding slider 21 moving to the left arbitrarily during sewing and getting caught in the thread 9.

[0029] When replacing the thread 9 inserted into the needle hole of the needle 11 in FIG. 1 with another thread 9, the thread 9 can be pulled out from the needle hole of the needle 11 and a predetermined part in the sewing machine 1 by pulling the thread 9 on the side where the needle 11 is located rather than the thread hanging base 16. After that, as shown in FIG. 4(b), the thread holding slider 21 is slid to the left side. Since the thread holding slider 21 of the present embodiment is provided with a knob 25 and a finger can be hooked on this knob 25 for operation, the thread holding slider 21 can be easily slid. Further, the thread holding slider 21 slid to the left side is not moved unintentionally because the positioning hole 24 engages with the first positioning convex portion 19.

[0030] By the way, the thread hanging portion 8 shown in FIG. 4(a) is covered by moving the thread holding slider 21 to the left side (first position) as shown in FIG. 4(b). Further, as shown in FIG. 5, there is a gap of 2×δ in the front-rear direction between the hole inside the thread holding slider 21 and the thread hanging base 16, and δ is set to be about the same as the outer diameter of the thread 9. That is, when the thread holding slider 21 is moved to the left side, the α portion located near the thread hanging portion 8 in the thread 9 contacts the thread hanging base 16 and the thread holding slider 21 in a bent state as shown in the drawing. That is, since a minute frictional force acts between the α portion in the thread 9, the thread hanging base 16, and the thread holding slider 21, the movement of the thread 9 can be restricted and held.

[0031] In addition, the excess portion on the needle 11 side of the thread 9 held by the thread holding slider 21 can be cut by the cutting blade 26 by guiding this inside the groove portion 27. That is, it is not necessary to separately prepare a tool such as scissors when cutting the excess portion of the thread 9.

[0032] Then, the thread holding slider 21 at the part where the thread 9 to be replaced is held is moved to the right side to release the thread 9, and the thread 9 is inserted into the needle hole of the needle 11 via a predetermined part in the sewing machine 1, whereby sewing can be performed with the replaced thread 9.

[0033] Thus, according to the sewing machine 1 of this embodiment, the thread 9 can be held only by sliding the thread holding slider 21 to the left, and the operation of sliding the thread holding slider 21 can be performed with one hand. That is, unlike the sewing machine of Patent Document 1 described above, it is not necessary to hold the thread with both hands, so the workability is excellent. By the way, in the conventional sewing machine shown in Patent Document 1, when holding the thread, the thread is sandwiched between the O-ring (32) and the mounting portion (31). It can be said that this part has a configuration similar to a part of the thread path in a general sewing machine. Therefore, not only is it the proper way to hold the unused thread with the O-ring (32) and the mounting portion (31), but there is also a possibility that the thread for sewing may be set in a state of passing between the O-ring (32) and the mounting portion (31). And when the thread is set in such a wrong state, it is assumed that an excessive load is applied to the thread during sewing, making the thread likely to break, or the O-ring (32) is worn by the moving thread. On the other hand, the thread holding slider 21 of this embodiment is not likely to be misrecognized as the thread path, so there is no possibility of leading to such problems. In addition, since the engagement between the first positioning convex portion 19 and the positioning hole 24 is released when a light force is applied to the thread holding slider 21 of this embodiment, even when sewing is performed with the thread 9 held by the thread holding slider 21 by mistake, the engagement between the first positioning convex portion 19 and the positioning hole 24 is released by the tension from the thread 9, so that an excessive load is not applied to the thread 9 from the thread holding slider 21.

[0034] As described above, an embodiment embodying the present invention has been illustrated. However, the present invention is not limited to such a specific embodiment, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims, unless otherwise specifically limited in the above description. In addition, the effects in the above embodiment are merely examples of the effects resulting from the present invention, and it does not mean that the effects of the present invention are limited to the above effects.

[0035] For example, in the above-described embodiment, the first positioning convex portion 19 and the second positioning convex portion 20 that partially project with respect to the thread hooking base 16 are provided, and the positioning hole 24, which is a through hole, is provided with respect to the thread holding slider 21. However, they may be mutually interchanged, that is, a through hole may be provided in the thread hooking base 16 and a convex portion may be provided in the thread holding slider 21.

Explanation of Reference Numerals

[0036] 1: Sewing machine 2: Thread stand device 3: Thread stand bar 8: Thread hooking portion 9: Thread 10: Thread bobbin 16: Thread hooking base 19: First positioning convex portion (first engaging portion) 20: Second positioning convex portion (second engaging portion) 21: Thread holding slider 24: Positioning hole (engaging portion) 25: Knob 26: Cutting blade 27: Groove portion

Claims

1. In a thread stand device of a sewing machine including a thread stand rod for inserting a thread bobbin and a thread hanging base for hanging the thread wound around the thread bobbin, a thread holding slider that is slidable with respect to the thread hanging base and moves between a first position that covers a thread hanging portion of the thread hanging base where the thread is hung and a second position that exposes the thread hanging portion is provided, by sliding the thread holding slider to the first position, the thread hung on the thread hanging portion is held, the thread holding slider has an engaging portion that engages with the thread hanging base, the thread hanging base includes a first engaging portion that engages with the engaging portion and holds the thread holding slider in the first position, and a second engaging portion that engages with the engaging portion and holds the thread holding slider in the second position. The thread stand device is characterized by this.

2. including a plurality of the thread hanging portions and the same number of the thread holding sliders as the thread hanging portions, The thread stand device according to claim 1, wherein the plurality of thread holding sliders are individually slidable with respect to the thread hanging base.

3. The thread stand device according to claim 1 or 2, wherein the thread holding slider includes a knob that serves as a finger hold when sliding with respect to the thread hanging base, a groove portion provided in the knob, and a cutting blade that cuts the thread inserted into the groove portion.

4. A sewing machine including the thread stand device according to any one of claims 1 to 3.

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