KR101010835B1 - Rotary shuttle device for sewing machine - Google Patents

Abstract

The rotary bobbin of the sewing machine of the present invention has a radius of the outer bobbin of the forming portion of the thread slip inclined surface which is continuous at the tip of the hook than the radius of the outer bobbin of the portion of the thread slip inclined surface facing the rotation axis of the outer bobbin. I'm making it big. The slope for thread slip is inclined at an urgent angle with respect to the axis of rotation of the outer bobbin. The upper thread loop, grasped by the tip of the hook, slides easily along an inclined thread slip slope. The upper thread loop is entangled with the lower thread by reliably moving to the front face of the bobbin case without being wound around the rotating bobbin. The rotary bobbin of the sewing machine of the present invention can reliably form a stitch regardless of the type and thickness of the upper thread.

Sewing machine, rotary bobbin, bobbin case, upper thread loop, hook tip

Description

ROTARY SHUTTLE DEVICE FOR SEWING MACHINE}

The present invention relates to a rotary bobbin of a sewing machine, which is disposed below the needle plate in the front part of the bed and rotates in one direction by driving of the lower shaft.

The sewing machine is provided with a needle plate and a rotary drum arranged under the needle plate.

The rotary bobbin described in Japanese Utility Model Registration No. 2568825 has an outer bobbin, an inner bobbin (inner bobbin) and a bobbin case. The outer drum is connected to the front end of the lower shaft. The inner bobbin is rotatably installed relative to the outer bobbin. The bobbin case is detachably attached to cover the front part of the inner bobbin. The lower thread is wound around the bobbin bobbin and is housed inside the bobbin case. The outer drum rotates at the lower side of the needle plate by the driving of the lower shaft. The inner bobbin regulates rotation by a bobbin stop member provided on the needle plate.

The outer drum has a hooked tip on part of the outer periphery. The hook tip has a tip extending in the rotational direction along the outer periphery of the outer drum. The outer bobbin has an outer drum slope on the outer circumferential portion of the hook tip. The outer bobbin slope is inclined toward the front with the inner bobbin and bobbin case installed.

The lower shaft rotates by driving the sewing machine spindle. The outer drum fixed to the lower shaft rotates in synchronism with the vertical movement of the sewing needle driven by the sewing machine main shaft. The hook tip installed in the outer bobbin pivots around the rotation of the outer bobbin. The tip of the hook passes through the immediate vicinity of the sewing needle when the sewing needle lowered to the lower part of the needle plate rises slightly from the lowest position. The tip of the hook passing directly near the sewing needle catches and widens the upper thread loop extending from the thread hole of the sewing needle.

The upper thread loop, in which the hook tip extends, slides the outer bobbin slope continuous to the base of the hook tip and moves from the right side to the left side through the front face of the bobbin case. The moving upper thread loop is entangled with the lower thread coming out of the bobbin case to form a stitch.

The outer bobbin inclined surface contacts the moving upper thread and applies a movement resistance. The transfer resistance applied to the upper thread is, for example, when the upper thread is a thick nylon yarn, so that the upper thread is difficult to slide along the outer north slope. For this reason, the upper thread loop cannot smoothly move to the front face of the bobbin case, and may be entangled between the inner bobbin and the outer bobbin, resulting in a poor stitch formation.

The object of the present invention is that the upper thread loop held by the hook end slides the inclined surface continuous to the base of the hook end, so that the stitch can be reliably formed regardless of the type and thickness of the upper thread by being intertwined with the lower thread through the front surface of the bobbin case. It is.

The rotary bobbin of the sewing machine of claim 1 has an outer bobbin which rotates in one direction from the needle plate provided on the bed and has a hook tip extending in the rotational direction in a part of the outer periphery, and in the front part of the outer bobbin. An inner bobbin and a bobbin case installed so as to be rotatable relative to each other, and an inclined surface for thread sliding inclined toward the front surface of the bobbin case on an outer circumferential portion of the outer bobbin continuous to the base of the hook tip; The upper bobbin loop of the sewing machine in which the upper thread loop held by the hook tip by the rotation of the bobbin slides the thread slip slope and passes through the front surface of the bobbin case, wherein the outer bobbin of the formation portion of the thread slip slope is formed. The radius of is large relative to the axis of rotation of the outer drum is It is made larger than the radius of the said outer drum of the part which faces.

The radius of the outer bobbin means a radius (rear radius) on the side (rear side) opposite to the mounting side (front side) of the inner bobbin.

Since the radius (rear side radius) of the outer bobbin of the formation part of the thread sliding inclination surface is larger than the radius (rear radius) of the outer north side of the part which the formation part of the thread slip inclination surface facing with respect to the rotation axis of an outer north bag, The inclined surface for thread sliding has a large inclination angle with respect to the direction of the axis of rotation of the rotary drum. Therefore, the upper thread loop caught by the tip of the hook easily slides the inclined surface for thread slipping, and moves to the front surface of the bobbin case to form a stitch regardless of the type and thickness of the upper thread.

The rotary drum of the sewing machine of claim 2 is provided with a thread moving inclined surface that is inclined in the same direction as the thread sliding inclined surface on a portion opposite to the tip of the hook of the thread sliding inclined surface, and the outer side of the thread moving inclined surface. The inclination angle with respect to the rotation axis of a bobbin is made larger than the inclination angle with respect to the said rotation axis of the said thread slip inclination surface.

The thread moving inclined surface is provided on the part opposite to the hook tip of the thread sliding inclined surface, and has a larger inclination angle than the thread sliding inclined surface. Therefore, the upper thread which slides the thread sliding inclination surface moves to the thread movement inclination surface which has a larger inclination angle than the thread sliding inclination surface, and it moves swiftly and reliably moves to the front surface of a bobbin case. The upper thread is not entangled in the rotary bobbin, so that the formation of stitches does not occur.

In the rotary bobbin of the sewing machine of claim 3, the inclined surface for thread movement has a triangular shape when viewed from the front of the outer bobbin.

The inclined plane for yarn movement having a triangular shape when viewed from the front can be easily formed by cutting the inner part of the inclined plane for yarn sliding.

According to the present invention, the upper thread loop caught by the hook end slides the inclined surface continuous to the base of the hook end, and can be reliably formed by the bobbin case intertwined with the lower thread regardless of the type and thickness of the upper thread. .

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail with reference to drawings which show preferable embodiment.

As shown in Fig. 1, the sewing machine M is provided with a bed 1, a leg column 2, and an arm 3. The leg pillar 2 is provided so that it may rise upward from the upper surface of the rear part (back side in FIG. 1) of the bed 1 upward. The arm 3 extends forward from the upper end of the leg post 2 to face the bed 1. The needle plate 5 is fixed to the upper surface of the front end of the bed 1.

As shown in Fig. 1, a sewing machine motor 6 is provided at the rear end of the arm 3. The sewing machine motor 6 drives the sewing machine spindle (not shown) to rotate. The sewing machine spindle is arranged inside the arm 3 so as to extend in the front-rear direction. The sewing machine spindle drives the needle bar drive mechanism (not shown) and the thread take-up drive mechanism (not shown) provided inside the arm 3. The needle bar drive mechanism moves the needle bar 8 in the vertical direction.

The needle bar 8 is supported inside the front end of the arm 3. The sewing needle 9 is provided at the lower end of the needle bar 8 extending to the outside of the arm 3. The thread take-up drive mechanism moves the thread take-up (not shown) up and down. The take-up machine tightens the upper thread 22 (refer to FIG. 10) by the upward movement of the take-up machine. Since the needle bar drive mechanism and the thread take-up drive mechanism are conventionally known mechanisms, detailed description thereof will be omitted.

The main shaft of the sewing machine drives the lower shaft (the drum drive shaft) 7 inside the bed 1. As shown in Fig. 2, the lower shaft 7 is disposed inside the bed 1 so as to extend in the front-rear direction. The rotary drum 10 of this invention is provided in the front end of the lower shaft 7 which reaches below the needle plate 5. As shown in FIG. The rotary drum 10 of the present invention operates as described later by the rotation of the lower shaft 7.

As shown in Fig. 4, the rotary bobbin 10 has an outer bobbin 11, an inner bobbin 12, and a bobbin case 15. As shown in Figs. The outer drum 11 is connected to the front end of the lower shaft 7 by a joint 17. The needle guard plate 13 is fixed to the rear side of the outer drum 11. An arc-shaped curved ring 14 is fixed along the outer periphery of the front side of the outer drum 11. The outer drum 11, the needle guard plate 13 and the curved ring 14 are rotated in the clockwise rotation direction R (see Figs. 5 and 6) when viewed from the front by the driving of the lower shaft 7. Rotation of the outer bobbin 11 occurs in synchronism with the vertical movement of the needle bar 8 and the sewing needle 9 driven by the sewing machine spindle, and the vertical movement of the thread take-up.

As shown in Figs. 5 and 6, the outer drum 11 has an outer circumferential wall 11e that rises toward the front. A part of the circumferential direction is cut out of the outer peripheral wall 11e of the outer drum 11. The outer drum 11 has a hook tip 11a extending in the rotational direction at one end of the outer circumferential wall 11e. The hook tip 11a pivots along the outer periphery of the outer bobbin 11 by the rotation of the outer bobbin 11 in synchronization with the vertical movement of the sewing needle 9. As shown in Fig. 10, the pivotally moving tip 11a passes through the processing cloth W and passes immediately near the sewing needle 9 reaching the lower side of the needle plate 5. As shown in Figs. 2 to 4, the tip end portion of the hook tip 11a faces the inclined rear side so as to pass through the immediate vicinity of the sewing needle 9. Passage of the hook tip 11a occurs at a timing when the sewing needle 9 which has reached the lowest position slightly rises. The hook tip 11a catches the upper thread loop 22a extending from the thread hole 9a of the sewing needle 9.

The needle guard plate 13 provided on the rear side of the outer drum 11 is in contact with the rear side of the sewing needle 9 that descends. The hook tip 11a can pivot without colliding with the sewing needle 9 in contact with the needle guard plate 13.

As shown in Figs. 8 and 9, the inner drum 12 includes a bottom plate 12b and side walls 12c. The side wall 12c is provided in the outer peripheral part of the circular bottom plate 12b so that it may spring forward over about half a wheel. The bottom plate 12b is provided with the shaft 12a extended forward in the center part. As shown in Fig. 6, the annular groove 11f is formed on the inner surface of the outer circumferential wall 11e of the outer drum 11. As shown in Figs. 7 and 8, the inner bobbin 12 is provided in the outer bobbin 11 by fitting the outer circumference of the bottom plate 12b to the annular groove 11f. The inner bobbin 12 is rotatable relative to the outer bobbin 11 with the annular groove 11f as a guide.

The curved ring 14 on the front side of the outer drum 11 is fixed to a part of the outer circumferential wall 11e of the outer drum 11 by a plurality of fixing screws. The curved ring 14 blocks the cutout portion of the outer circumferential wall 11e and presses the front portion of the inner bobbin 12 provided in the outer bobbin 11.

As shown in Fig. 4, the bobbin case 15 is a cylinder blocking the front face. The bobbin case 15 is mounted to block the opening of the inner bobbin 12 in which the bobbin bobbin 18 is accommodated. The lower bobbin bobbin winds the lower thread 24 (refer FIG. 10) on the outer periphery. The inner bobbin 12 supports the bobbin bobbin 12 by inserting the bobbin bobbin 12 into the shaft 12a. 1 to 3, the bobbin stop member 16 is fixed to the lower side of the front portion of the needle plate 5. The bobbin stop member 16 has the stop part 16a divided into two at the rear end. The stop portion 16a contacts the outer circumferential portion of the side wall 12c of the inner bobbin 12, thereby restricting the inner drum 12 from rotating relative to the outer bobbin 11. As shown in FIG. 10, the lower thread 24 comes out from the exit of the front surface of the bobbin case 15 and leads to the processing cloth W via the needle hole 5a of the needle plate 5.

5 to 7, the outer drum 11 includes a hook tip inclined surface 11b, an outer drum inclined surface 11c, and a thread slip inclined surface 11ea. The hook tip 11a is formed at the end of the hook tip inclined surface 11b. As shown in Fig. 7, the hook tip inclined surface 11b is inclined to the rear side toward the rotation center axis O of the outer drum 11. The outer bobbin slope 11c is continuous with the rear end of the hook tip slope 11b. The outer bobbin sloping surface 11c becomes an inclination spaced apart from the rotation center axis O of the outer bobbin 11 as it becomes the rear side. The outer bobbin inclined surface 11c and the hook tip inclined surface 11b are inclined in opposite directions with respect to the valley line 11d.

The thread slip slope 11ea extends on the opposite side to the hook tip 11a in succession to the hook tip slope 11b and the outer north slope 11c. As shown in Fig. 8, the thread slip slope 11ea is inclined toward the rotational center axis O of the outer drum 11 as it becomes the front side. The inclined surface 11ea for thread sliding inclines toward the front surface of the bobbin case 15 provided in the front surface of the outer drum 11. As shown in Fig. 5, the thread slip slope 11ea is in the range of an arc (center angle of about 66 °) formed by the point P and the point K 'on the outer circumference of the outer drum 11. It is formed over.

The center angle of the circular arc formed by the point P of the tip of the hook 11a and the inclined surface 11ea for thread slip is about 70 degrees.

As shown in Fig. 8, the radius R0 at the rear portion side of the outer bobbin of the formation portion of the yarn slip slope 11ea is formed with the yarn slip slope 11ea with respect to the rotation center axis O. It is larger than the radius R1 in the rear part side of the outer north side of the part which opposes a part. Radius R0 is the distance (for example, 25 mm) from the rotation center axis O of outer drum 11 to the outer periphery of the rear part side of the outer drum of the formation part of the inclined surface 11ea for thread slipping. . Radius R1 is the distance (for example, 20 mm) between the rotation center axis O of outer drum 11 to the outer periphery of another part. As shown in Fig. 5, the radius R0 is in the range L0, and the radius R1 is in the range L1.

As shown in Fig. 8, the inclined surface 11ea for seal sliding has an inclination angle with respect to the axis OA parallel to the rotational center axis O of the outer drum 11. In the conventional rotary drum, the radius of the formed portion of the thread slip slope 11eb (indicated by the dashed-dotted line in Fig. 8) is equal to the radius R1 of the other portions. The inclined surface 11eb for thread sliding of the conventional rotary drum has an inclination angle with respect to the axis OA parallel to the central axis of rotation O of the outer drum 11.

In the rotary drum 10 of the present invention, the radius R0 of the formed portion of the thread slip slope 11ea is larger than the radius R1 of the other portions. Therefore, the inclination angle θA (for example, 25 °) of the thread slip inclination surface 11ea is larger than the inclination angle θ1 (for example, 14 °) of the conventional thread slip inclination surface 11eb. .

As shown in Fig. 5, the portion of the outer circumference radius R0 reaches a point K located on the opposite side to the hook tip 11a with respect to the end point K 'of the thread slip slope 11ea. . The center angle of the circular arc formed by the starting point P and the point K of the real slip slope 11ea is about 66 degrees. In Fig. 5, the radius of the outer circumference of the outer bobbin 11 gradually decreases from R0 to R1 as it goes from the point K to the point W of the outer bobbin 11.

11 g of yarn movement inclination surfaces are formed in the front side of the terminal part part of the yarn slip slope 11ea. As shown in Fig. 5, the yarn moving inclined surface 11g is located near the end point K 'of the yarn slipping inclined surface 11ea, and is substantially triangular when viewed from the front. As shown in Fig. 9, the yarn moving inclined surface 11g is continuous to the front side of the yarn slipping inclined surface 11ea. As shown in Fig. 9, the yarn movement inclined surface 11g has an inclination angle θC with respect to the axis OA parallel to the rotation center axis O of the outer drum 11, and the inclined surface 11ea for yarn sliding. It is inclined in the same direction as. Inclination angle (theta) C (for example, 48 degrees) of 11 g of real movement inclination surfaces is larger than inclination angle (theta) B (for example, 20 degrees) of real slip slope 11ea. The larger the inclination angle is, the higher the upper thread loop 22a is, the easier it is to slide along the inclined surface 11ea for thread sliding and the inclined surface 11g for yarn movement.

As shown in Fig. 5, the yarn movement inclined surface 11g has a planar shape of the front edge of the outer circumferential wall 11e of the outer drum 11 in the vicinity of the end point K 'of the yarn sliding inclined surface 11ea. It can form easily by cutting out.

The sewing operation of the sewing machine M provided with the rotary drum 10 of the present invention will be described.

The hook tip 11a which pivots around the outer periphery of the outer drum 11 passes through the processing cloth W and immediately near the thread hole of the sewing needle 9 reaching the lower side of the needle plate 5. Passage of the hook tip 11a occurs at a timing when the sewing needle 9 is slightly raised from the lowest position. The hook tip 11a catches and widens the upper thread loop 22a extending from the thread hole of the sewing needle 9.

The outer drum 11 of the rotary drum 10 rotates by the drive of the lower shaft 7. The lower shaft 7 is rotated in synchronization with the sewing machine main shaft by the drive of the sewing machine motor 6. Therefore, the outer drum 11 rotates in synchronism with the vertical movement of the sewing needle 9 driven by the sewing machine main shaft. As described above, the hook tip 11a of the outer bobbin 11 is pivoted by the rotation of the outer bobbin 11 and moves the upper thread loop 22a extending from the thread hole 9a of the sewing needle 9. Catch and widen

Fig. 10 shows a state in which the outer bobbin 11 is rotated about 180 ° after the hook tip 11a passes through the sewing needle 9 immediately. As shown in Fig. 10, the upper thread loop 22a held by the hook end 11a is divided into a front side roof chamber 22aa and a rear side roof chamber 22ab and widened by the pivoting movement of the hook end 11a. Lose.

The front roof chamber 22aa is hooked on the tip of the hook (not shown) of the inner bobbin 12, and as shown by the dotted line in Fig. 10, it is returned to the rear to be wound around the inner bobbin 12. The needle guard plate 13 provided on the rear side of the outer drum 11 restricts the movement of the rear roof chamber 22ab to the rear. Therefore, the rear side roof chamber 22ab slides toward the inner circumferential side of the outer drum 11 along the outer drum slope 11c and the thread slip slope 11ea that are continuous to the base of the hook tip 11a, It moves to the front surface of the bobbin case 15.

As described above, in the rotary drum 10 of the present invention, the inclination angle θA of the thread slip slope 11ea of the outer bobbin 11 is the inclination of the yarn slip slope 11eb of the conventional outer bobbin. It is larger than the angle θ1. Therefore, even when the upper thread 22 is not slippery or when the upper thread 22 is thick, the rear side roof chamber 22ab is a thread sliding inclined surface having a larger inclination angle than the conventional thread sliding inclined surface ( It slides easily along 11ea) and moves to the front surface of the bobbin case 15.

The outer drum 11 of the rotary drum 10 of the present invention has a yarn movement inclined surface 11g near the end point K 'of the yarn slip slope 11ea. The inclination angle θC of the real moving inclined surface 11g is larger than the inclination angle θB of the real sliding inclined surface 11ea. Therefore, the upper thread loop 22a (rear-side roof chamber 22ab) which slides the thread sliding inclined surface 11ea accelerates a slipping speed by the thread movement inclined surface 11g with a large inclination angle, and bobbin case 15 Move firmly to the front of the

The hook tip 11a continues to move from the position shown in FIG. The upper thread loop 22a moves along the front face of the bobbin case 15 to the left direction by the pivoting movement of the hook tip 11a. The moving upper thread loop 22a is entangled with the lower thread 24 coming out of the outlet of the front surface of the bobbin case 15. The upper thread loop 22a entangled with the lower thread 24 is tightened by the rise of the thread take-up, thereby forming a stitch on the fabric W. The upper thread loop 22a slides along the thread sliding inclined surface 11ea having a large inclination angle θA and the yarn moving inclined surface 11g having a larger inclination angle θC than the thread sliding inclined surface 11ea. Move to the front of (15). Therefore, the moving upper thread loop 22a does not get entangled between the outer bobbin 11 and the inner bobbin 12, and can reliably prevent the generation of the stitch formation.

The modified form which partially changed embodiment described above is demonstrated.

1) The inclination angle θA of the thread slip inclined surface 11ea of the outer drum 11 is not limited to 25 ° shown in the embodiment, but may be an angle larger than 25 ° or an angle smaller than 25 ° (conventionally). Larger than 14 °).

2) The radius R0 of the formation portion of the thread slip slope 11ea is not limited to 25 mm shown in the embodiment. The radius R0 of the formation portion of the yarn slip slope 11ea may be larger than the conventional radius R1.

3) The inclination angle θC of the inclined surface 11g for real movement is not limited to 48 ° shown in the embodiment. Inclination angle (theta) C of 11 g of real movement inclination surfaces can be made into the arbitrary angle larger than inclination angle (theta) B of the real slip slope 11ea.

4) The planar shape of the yarn movement inclined surface 11g which is formed continuously on the front side of the terminal end portion of the yarn inclined surface 11ea is not limited to the substantially triangular shape shown in the embodiment, but may be another shape such as an ellipse.

As apparent from the above detailed description, the rotary drum of the sewing machine of the present invention has an inclined surface for thread sliding inclined toward the front surface of the bobbin case provided at the front of the outer drum, at the outer peripheral portion of the outer drum which is continuous to the hook tip. do. The radius (rear radius) of the outer bobbin of the forming portion of the thread slip slope is greater than the radius (rear radius) of the other portion of the outer bobbin of the portion of the portion in which the yarn slip slope is opposed to the rotation axis of the outer bobbin. Therefore, the inclined surface for thread sliding has a large inclination angle with respect to the direction of the rotation axis of the rotary drum. Therefore, the upper thread loop caught by the tip of the hook easily slides the inclined surface for thread slipping to move to the front surface of the bobbin case, and is not wound around the rotary bobbin. Slip of the upper thread on the inclined surface for thread slipping may be performed when an upper thread which is hard to slip or when a thick upper thread is used. The rotary bobbin of the present invention can reliably form a stitch irrespective of the type and thickness of the upper thread, so that a defective stitch formation does not occur.

1 is a side view of a sewing machine having a rotary bobbin of the present invention.

Fig. 2 is an enlarged side view of the front end portion of the arm and bed of the sewing machine shown in Fig. 1;

3 is an enlarged plan view of a front end portion of a bed of a sewing machine according to the present invention;

Figure 4 is a side view of the rotary bobbin of the present invention with the bobbin case and the bobbin bobbin removed.

5 is a front view of the outer drum;

6 is a perspective view of an outer drum;

FIG. 7 is a sectional view taken along the line G-G in FIG. 5; FIG.

FIG. 8 is a sectional view taken along the line H-H in FIG. 5; FIG.

Fig. 9 is a sectional view taken along the line I-I in Fig. 5;

10 is a front view showing a state of a rotary bobbin during sewing.

<Explanation of symbols for the main parts of the drawings>

1: Bed

2: bridge pillar

3: cancer

5: needle plate

6: sewing machine motor

8: needle bar

9: sewing needle

10: rotary drum

16: bobbin stop member

M: Sewing Machine

Claims (3)

An outer bobbin which rotates in one direction from the lower side of the needle plate installed on the bed and has a hook tip extending in the rotational direction on a part of the outer periphery, and an inner bobbin and bobbin case which is installed to be rotatable relative to the front part of the outer bobbin; And an inclined surface for thread sliding inclined toward the front surface of the bobbin case on the outer circumferential portion of the outer bobbin continuous to the base of the hook tip, and the upper thread held by the hook tip by rotation of the outer bobbin. In the rotary drum of the sewing machine in which a loop slides the thread slip slope to pass through the front surface of the bobbin case, The radius of the outer bobbin of the forming portion of the thread slip inclined surface is larger than the radius of the outer bobbin of the portion in which the forming portion of the thread slip inclined surface opposes the rotation axis of the outer bobbin. . The yarn movement inclination surface which inclines in the same direction as the said yarn sliding inclination surface is provided in the part on the opposite side to the said tip end of the said thread slip inclination surface, And an inclination angle with respect to the rotation axis of the outer bobbin of the yarn movement inclined surface is greater than an inclination angle with respect to the rotation axis of the yarn sliding inclined surface. The rotary drum case according to claim 2, wherein the thread moving inclined surface has a triangular shape when viewed from the front of the outer drum house.

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