WO2005087999A1

WO2005087999A1 - Automatic bobbin change device

Info

Publication number: WO2005087999A1
Application number: PCT/JP2004/003508
Authority: WO
Inventors: Haruhiko Kinoshita; Sei Kato
Original assignee: Kinoshita Precision Industrial Co. Ltd.
Priority date: 2004-03-16
Filing date: 2004-03-16
Publication date: 2005-09-22

Abstract

An automatic bobbin change device (3), wherein a chuck drive cylinder (26) reciprocatingly rotates a chuck drive lever (14) until a chuck slide shaft (24) is positioned parallel with the vertical part (6c) of a guide groove (6) through the through-groove (16a) of a chuck pin (16) at a standby position (11) so that a bobbin chuck (18) can hold a bobbin case (12). At a change position (K), the bobbin chuck (18) is positioned generally parallel with the horizontal part (6a) of the guide groove (6) through the through-groove (16a) of the chuck pin (16) so that the bobbin case (12) can be fitted to a shuttle (8). In the process of the reciprocating movement of the chuck pin (16) in the guide groove (6), the through-groove (16a) always holds the bobbin chuck (18), as a parallel holding member, in a parallel state with the chuck slide shaft (24), and reciprocatingly rotates inward on the opposite side of the shuttle (8).

Description

Automatic bobbin changer Technical field

The present invention relates to an automatic bobbin exchanging device for automatically replacing a bobbin case accommodating a bobbin when a bobbin thread mounted on a sewing machine is no longer used. Background art

In an industrial sewing machine, a bobbin around which a bobbin thread is wound is housed in a bobbin case, and the bobbin case is mounted on a sewing machine hook. The upper thread supplied from the sewing needle and the lower thread of the bobbin are paid out to sew textiles such as clothes and leather goods. Since the bobbin bobbin winding amount is extremely small compared to the upper thread supply amount, every time the bobbin bobbin bobbin is used up, the bobbin together with the bobbin case is taken out from the sewing machine, and the bobbin bobbin case becomes full bobbin. They need to be replaced frequently.

Therefore, development for realizing the automatic replacement of the bobbin case has been advanced, and examples thereof are disclosed in JP-A-8-196766, JP-A-8-280927, and It is described in Japanese Patent Publication No. 9-66 181. In the bobbin thread changing devices described in these publications, the cam grooves for guiding the bobbin case are complicated, so that the moving distance of the bobbin case becomes longer, and the air cylinder for moving the chuck is disposed in an inclined state. Therefore, it was inevitable that the vertical and horizontal extension lengths would increase. However, the lower part of the sewing table on the sewing machine The space below the sewing machine was limited, and there was room for improvement in reducing the size of the automatic bobbin changing device and realizing space saving.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object a relatively simple configuration, in which the moving distance of the bobbin case can be set to the shortest, and smooth and quick replacement of the bobbin case can be realized. An object of the present invention is to provide an automatic bobbin exchanging device capable of reducing the space and saving space. Disclosure of the invention

(1) The support plate portion is provided so as to hang down from the sewing table, and forms an inverted L-shaped guide groove including a horizontal portion, an arc-shaped portion, and a vertical portion. The bobbin hub is rotatably provided below the sewing machine hook, and a plurality of bobbin cases are detachably provided on an outer peripheral portion. The chuck driving lever is rotatably supported by the support plate, and has a chuck pin at a tip end thereof that penetrates the guide groove. The bobbin chuck holds the bobbin case detachably from the bobbin hub. The chuck slide shaft has one end rotatably supported by a support plate and the other end slidably connected to a chuck pin.

By driving the drive member and reciprocating the chuck drive lever, the chuck slide axis becomes parallel to the vertical part of the guide groove via the chuck pin, and the bobbin chuck stands by to hold the bobbin case. The position is parallel to the parallel portion of the guide groove via the chuck pin, and the bobbin chuck moves between the exchange position where the bobbin case is mounted on the sewing machine hook. In the parallel holding member, the chuck slide shaft reciprocates along the guide groove. During the operation, the bobbin chuck is always kept parallel to the chuck slide axis, and the bobbin chuck is reciprocated inward on the opposite side of the sewing machine hook.

The guide groove of the support plate portion is formed in an inverted L shape from a horizontal portion, an arc-shaped portion, and a vertical portion, and the bobbin chuck reciprocates along the guide groove via the chuck pin. For this reason, the moving distance of the bobbin case becomes the shortest, and smooth and quick replacement of the bobbin case can be realized. In addition, the bobbin hub, chuck drive lever, chuck slide shaft, and drive member can be arranged vertically, horizontally, and back and forth along the support plate, making the whole compact and space saving. Can be realized.

(2) The bobbin chuck has a chuck claw that is driven by the chuck driving cylinder 1 and detachably holds the bobbin case. The chuck claws allow the bobbin case to be attached to and detached from the bobbin chuck with a relatively simple structure. '

(3) The parallel holding member is a through-groove provided in the chuck pin in a direction perpendicular to the axis and slidably receiving the chuck slide shaft. Thereby, it is possible to function as a parallel holding member only by forming a through groove, which contributes to simplification of the entire structure.

(4) The parallel holding member is a long groove formed in the axial direction of the chuck slide shaft so that the tip of the rectangular cross section of the bobbin chuck is slidably fitted. With this, it is possible to function as a parallel holding member only by forming a long axis groove in the chuck slide shaft, which contributes to simplification of the entire structure as in the case of (3).

(5) The bobbin hub is provided with a predetermined indexing board connected to the bobbin hub. It is driven according to the index angle. The indexing board allows the bobbin hub to rotate accurately at a predetermined angle, thereby preventing malfunction of the bobbin case when replacing.

(6) Since the indexing panel is driven by the indexing driving cylinder, existing driving members can be applied, which is advantageous in cost.

(7) A brake band is provided that slides and brakes on the outer periphery of the indexing panel after indexing drive of the indexing panel. For this reason, the rotation of the indexing board is braked after the indexing drive, and the bobbin hub can be made to stand by at a precise stationary position. Brief Description of Drawings

FIG. 1 is a front view of an automatic bobbin changing device (Embodiment 1).

FIG. 2 is a schematic diagram of an automatic bobbin changing device shown for explaining the operation.

FIG. 3 is a rear view of the automatic bobbin changing device.

Figure 4 is a side view of the automatic bobbin changing device.

(A) and (mouth) in Fig. 5 are plan views of the bobbin chuck.

(A) in Fig. 6 is a rear view showing the main part of the automatic bobbin changing device.

) Is an enlarged front view showing the connection between the bobbin chuck and the chuck slide shaft.

FIG. 7 is a plan view showing the periphery of the indexing board.

FIG. 8 is a front view showing the periphery of the indexing board.

FIG. 9 is a front view showing the periphery of the brake band.

FIG. 10 is a schematic diagram showing a transport path of the bobbin case.

Figures 11 to 18 show that the bobbin chuck is moved from the replacement position to the standby position. It is the schematic which shows the mode which moves continuously.

FIG. 19 is an enlarged front view showing the connection between the bobbin chuck and the chuck slide shaft (Example 2). BEST MODE FOR CARRYING OUT THE INVENTION

[Example 1]

1 to 18 show a first embodiment of the present invention. As shown in FIGS. 1 and 2, a support plate portion 5 of an automatic bobbin changing device 3 is attached to a lower space 4 of a sewing table 2 of the sewing machine 1 in a hanging state. As shown in FIG. 1, the support plate portion 5 is formed with an inverted L-shaped guide groove 6 composed of a horizontal portion 6a, an arc-shaped portion 6b, and a vertical portion 6c as a cam groove. The horizontal portion 6a is set slightly longer than the pull-out distance of the shuttle pin P1 of the sewing machine hook 8, and the vertical portion 6c is set slightly longer than the pull-out distance of the bobbin standby pin 13 described later. The horizontal portion 6a and the vertical portion 6c are connected by an arc-shaped portion 6b having a predetermined difference in diameter, and are orthogonal to each other on an extension line where a shaft pin 25 described later is located.

As shown in FIG. 3, a base plate 7 having a substantially L-shaped cross section and located below the sewing machine 8 of the sewing machine 1 is attached to the lower end of the support plate 5. The sewing machine hook 8 has a hook pin P1 into which the bobbin case 12 is detachably inserted. The drive shaft 9 is provided on the base plate 7 in a substantially horizontal state. The drive shaft 9 has an indexing board 10 fitted at one end thereof, and a bobbin hub 11 attached to the other end thereof in a detachable manner as a bobbin cassette. The bobbin hub 11 is attached to and detached from the drive shaft 9 by a cassette pole lock structure. According to the cassette ball lock structure, a compression coil spring 9 b is provided near the tip of the drive shaft 9. A steel ball 9a urged outward is provided so as to be able to come and go. When the bobbin hub 11 is attached to the drive shaft 9, the bobbin hub 11 pushes down the steel ball 9a to temporarily shrink the compression coil spring 9b. At the position where the bobbin hub 11 has passed the steel ball 9a, the steel ball 9a is pushed up by the compression coil spring 9b to press and urge the bobbin hub 11. Thereby, quick and easy detachability of the bobbin hub 11 with respect to the drive shaft 9 is secured.

In this case, the free space existing in the front of the sewing machine 8 is not a preset space, but is limited, so that the transport path of the bobbin case 1 and 2 is shortened, and the space of the automatic bobbin changing device 3 is reduced. Is being promoted. Further, when the bobbin case 12 is replaced by a manual operation, the related parts such as the support plate 5 are not hindered by compactness, and a sufficient manual replacement space is secured.

As shown in FIG. 4, the bobbin hub 11 has, for example, six bobbin cases 12 removably attached to the outer peripheral portion thereof via bobbin standby pins 13. The bobbin case 12 removably accommodates a bobbin (not shown) around which a bobbin thread is wound, and the bobbin case 12 is replaced to replace the bobbin.

As shown in FIGS. 1 and 2, a check drive lever 14 is rotatably supported by a pivot pin 15 below the guide groove 6 in the support plate portion 5. The distal end of the chuck drive lever 14 forms a substantially U-shaped fork portion 14a, and receives the small distal end portion of the chuck pin 16 passing through the guide groove 6 in a sandwiched state. For this reason, as described later, in the process in which the check pin 16 slides from the horizontal portion 6a of the guide groove 6 to the arc-shaped portion 6b, the fork portion 14a acts as an escape for the check pin 16. You That is, when the chuck pin 16 slides on the arc-shaped portion 6b, the fork portion 14a allows the displacement of the chuck pin 16 so that the diameter difference between the guide groove 6 and the horizontal portion 6a. And the chuck pin 16 can be smoothly slid and guided from the arc-shaped portion 6b to the vertical portion 6c.

A bobbin chuck 18 is connected to an end of the chuck pin 16 opposite to the chuck drive lever 14 via a mounting base 17 as shown in FIGS. As shown in FIG. 5, the bobbin chuck 18 has a chuck claw 20 which is driven by a chuck cylinder 19 and detachably holds the bobbin case 12. That is, when the chuck cylinder 19 is driven, the rod 19a advances and the chuck claw 20 moves counterclockwise around the axis 10a as shown in FIG. To rotate. For this reason, the chuck claws 20 push the bobbin arm 21, and the square window 21 a is fitted to the projection 23 of the chuck body 12, and the bobbin case 12 is connected and held to the pobin chuck 18. . The fitting position of the bobbin arm 21 and the protruding portion 23 is accurately determined, and the bobbin case 12 is not displaced by an impact or the like when the bobbin case 12 is transported. If the bobbin cases 1 and 2 are connected and held, slight shaking or fluctuations will make it impossible to maintain the transfer accuracy for the sewing machine 8. The accuracy is within ± 0.1 mm, and the bobbin arm 21 and the projection 23 play a large role in maintaining the accuracy.

When the rod 19a of the chuck cylinder 19 is retracted as shown in (mouth) in Fig. 5, the chuck claws 20 rotate clockwise around the shaft 20a to rotate the bobbin arm. Let 2 1 be free. For this reason, the bobbin arm 11 releases the engagement with the projection 23 by its own spring force, returns to the original position, and returns the bobbin chuck 1 to the bobbin case 12. Release the connection holding of 8.

As shown in FIGS. 6A and 6B, the chuck pin 16 of the bobbin chuck 18 has a through groove 16a formed in a direction perpendicular to the axis. , A chuck slide shaft 24 of a predetermined length is slidably inserted in the axial direction. One end of the chuck slide shaft 24 is connected to the support plate 5 via a shaft pin 25 at a position opposite to the chuck drive lever 14 with respect to the guide groove 6 as shown in FIGS. It is rotatably supported. As described later, the bobbin chuck 18 and the chuck slide shaft 24 always move the bobbin chuck 18 in the process of reciprocating along the guide groove 6 as described later. It functions as a parallel holding member that keeps it parallel to the spindle 24.

As shown in FIG. 4, a chuck driving cylinder 26 as a driving member is attached to the lower end of the support plate portion 5 with a screw 27 via a spacer 28. The rod 26 a of the chuck driving cylinder 26 is rotatably connected to the chuck driving lever 14 by a connecting pin 29. The drive of the chuck horn cylinder 16 drives the rod 26a to advance, and the chuck drive lever 14 rotates around the pivot pin 15 in the direction indicated by the arrow A in FIG. I do. As a result, the chuck slide shaft 24 is parallel to the vertical portion 6c of the guide groove 6 via the chuck pin 16 as shown by the broken line in the same figure, and the bobbin chuck 18 becomes the bobbin case 12 Is moved to the standby position H for gripping. By retracting the rod 26a of the chuck driving cylinder 26, the chuck driving lever 14 rotates around the pivot pin 15 in the direction indicated by arrow B in FIG. I do. For this reason, the chuck slide axis 24 is indicated by a solid line in FIG. Thus, the bobbin chuck 18 moves to the replacement position K where the bobbin case 12 is mounted on the sewing machine 8 via the chuck pin 16 and becomes parallel to the horizontal portion 6a of the guide groove 6.

FIG. 7 shows a relationship between the bobbin hub 11 fitted to the common drive shaft 9 and the indexing board 10. The indexing board 10 has indexing pins 34 corresponding to the bobbin case 12 of the bobbin hub 11. The indexing board 10 is fixed to the drive shaft 9 by a lock collar 30 and a lock screw 31, and is provided rotatable with respect to the base plate 7 together with the drive shaft 9. An index drive cylinder 32 to which a brake plate base 33 is fixed is attached to the base plate 7 at the tip of a rod 32a. The brake plate base 33 has a spring claw plate 35 for pressing an index pin 34 of the index panel 10.

The indexing board 10 is provided to accurately match the attachment / detachment position of the bobbin case 12 provided on the bobbin hub 11. The shorter the indexing time of the indexing board 10, the quicker the bobbin case 12 can be replaced. The stopping accuracy of the indexing board 10 depends on the correspondence between the chucking position of the bobbin chuck 18 with respect to the bobbin case 12 and the position of the sewing machine hook 8. For this reason, the performance of the indexing board 10 is determined by its stopping accuracy and quickness. The index pins 34 are provided in accordance with the number of indexes of the index panel 10 and are divided into six in the first embodiment, but four, five, seven and eight divisions may be used as necessary.

Due to the advance displacement of the mouth 32 a in the indexing drive cylinder 32, the push claw 35 a of the spring claw plate 35 moves the index pin 34 by pressing the index pin 34 by a predetermined pitch, and the indexing is performed. The board 10 is rotated by a predetermined angle. At the time of retraction displacement of the mouth 3 2a, the pushing claw 35 of the spring claw plate 3 5 To return to the original position by sliding.

FIG. 8 and FIG. 9 show a brake band 36 that slides on the outer peripheral portion of the indexing board 10 to brake. A block locking pin 37 is provided between the brake plate base 33 and the base plate 7. One end of the brake band 36 is connected to the return spring 39 shown in FIG. 9, and the other end of the brake band 36 circumvents the brake plate base 33 and abuts the indexing board 10 in a circumscribed state. It is attached to the base plate 7 by the ends 36a. The brake band 36 has a function as an anti-back brake which is allowed to rotate only in the direction indicated by the arrow C by the return spring 39 and does not rotate in the reverse direction.

As shown in FIG. 8, when the rod 32 a of the indexing drive cylinder 32 advances, the stop positioning spring plate 38 abuts the indexing pin 34 and the rod 32 a By retreating, the spring pawl plate 35 gets over the index pin 34 and the stop positioning spring plate 38 returns to the position shown by the broken line. Therefore, when the index pin 34 is displaced by the index distance S, the stop positioning spring plate 38 comes into contact with the index pin 34 to prevent the index pin 34 from overrunning. In addition, the stop positioning spring plate 38 has a function of correctly correcting even a slight displacement caused when the index pin 34 is indexed and displaced. Furthermore, if the index pin 34 stops at an intermediate position for any reason, the stop positioning spring plate 38 contacts the index pin 34 to stop the inadvertent rotation displacement of the index panel 10. Thus, the cylinder switch (not shown) is deactivated to prevent electrical runaway.

When the indexing board 10 is indexed, the rod 32a of the indexing drive cylinder 32a moves forward and backward at high speed instantaneously. The impact that occurs when indexing panel 10 stops is large, and the impact is caused by reducing the inertial force when rotating indexing panel 10 Need to be relaxed. For this reason, the brake band 36 is slid in contact with the outer periphery of the indexing board 10 to prevent overbalancing based on the large kinetic energy of the indexing board 10 and to reduce the impact caused by high-speed indexing. Outgoing board 10 is protected.

In the above configuration, when the bobbin is exhausted due to the exhaustion of the bobbin as the sewing operation progresses, the empty bobbin is replaced with a full bobbin. Move the bobbin case 1 2 back and forth between the bobbin hub 1 1 and the sewing machine 8 as described above. That is, as shown in FIG. 11, the chuck driving cylinder 26 is driven to move the rod 26 a forward, and the chuck driving lever 14 is moved centering on the turning pin 15 via the connecting pin 29. Is turned in the direction indicated by arrow B. As a result, the chuck pin 16 slides along the vertical portion 6c, the arcuate portion 6b, and the vertical portion 6a of the guide groove 6 to the upper replacement position K. At this time, the bobbin chuck 18 does not hold the bobbin case 12 because the chuck claw 20 is not opened and the bobbin arm 21 is not pressed as shown in FIG. 4 and FIG. It slides alone along the guide groove 6 to the replacement position K in the same way as the check pin 16. At the exchange position K, the rod 19a of the chuck cylinder 19 moves forward as shown in (a) of FIG. 5, closes the chuck jaws 20 and fits the bobbin arm 21 into the projection 13 and The bobbin chuck 18 grips the bobbin case 12 in a connected state. In this state, the rod 26a of the chuck driving cylinder 26 is retracted in the direction opposite to the arrow D in FIG. 11, and the chuck driving lever 14 is moved in the direction indicated by the arrow A in FIG. Rotate. Therefore, the chuck pin 16 slides in the opposite direction on the horizontal portion 6a via the fork portion 14a, and the bobbin chuck 18 becomes the bobbin case 1 2 as shown by the arrow G in FIG. Grasp Pull out sewing machine hook 8 from hook pin P 1 and move it horizontally by linear distance L 1. As the chuck pin 16 slides from the horizontal portion 6a to the arcuate portion 6b, the bobbin chuck 18 and the bobbin case 12 are moved together with the bobbin case 12 as shown by the arrow E in FIGS. 14 and 15. Rotates inward on the side facing the shuttle 8. Then, the bobbin chuck 18 slides along with the bobbin case 12 from the arc-shaped portion 6b to the vertical portion 6c as shown in FIGS. 16 and 17, and a straight line as shown by the arrow F in FIG. It descends vertically by the distance L2 to the standby position H. At the standby position H, the rod 32a of the indexing drive cylinder 32 shown in FIG. 7 temporarily moves forward, and the bobbin hub 11 is moved by the indexing board 10 via the indexing pin 34. It has been rotated by a predetermined angle. For this reason, the bobbin chuck 18 is mounted by inserting the bobbin case 12 into the bobbin standby pin 13 of the empty space. At this time, the chuck claws 20 are opened to release the bobbin case 12 from the connection, as shown by (mouth) in FIGS. 4 and 5. In this state, the rod 32a of the indexing drive cylinder 132 shown in Fig. 7 moves forward temporarily, and pushes the indexing board 10 via the indexing pin 34 to rotate the bobbin hub 11. Move. As a result, the bobbin case 12 of the adjacent full bobbin rotates as shown by an arrow N in FIG. Next, as shown in FIG. 5A, the rod 19 a of the chuck cylinder 19 moves forward, and the bobbin chuck 18 grips and connects the bobbin case 12 with the bobbin arm 21. In this state, the rod 26a of the chuck driving cylinder 26 moves forward as shown by the arrow D in FIG. 11 and the chuck driving lever 14 is rotated in the direction of the arrow B so that the bobbin case 1 Move the bobbin chuck 18 gripping 2 upward along the guide groove 6 to the exchange position K. Bobbin at exchange position K When the case 12 is inserted and inserted into the shuttle pin P1, the chuck jaws 20 are opened as shown in Fig. 5 (opening), and the bobbin case 12 is released from the connection to be free. After the bobbin case 12 is mounted, the bobbin chuck 18 moves independently along the guide groove 6 to the standby position H in the same manner as described with reference to FIGS. When the bobbin chuck 18 reaches the standby position H, it waits for the next bobbin replacement, for example, near the bobbin standby pin 13 in an empty space.

In the process in which the bobbin chuck 18 and the chuck pin 16 reciprocate between the exchange position K and the standby position H along the guide groove 6, the chuck slide shaft 24 is rotated on the opposite side of the sewing machine 8. Rotate up and down around pin 25 (see Figs. 12 to 18). In this reciprocating process, the chuck slide shaft 24 passes through the through groove 16 a of the chuck pin 16, so that the bobbin chuck 18 is always parallel to the chuck slide shaft 24. Will be kept. Therefore, as shown by the arrow E in FIG. 14, the bobbin chuck 18 also pivots inward and downward on the opposite side of the sewing machine 8 so that it pivots as compared to the case where it pivots outward. Requires less space.

According to the above configuration, the guide groove 6 of the support plate portion 5 is formed in an inverted L shape from the horizontal portion 6a, the arc-shaped portion 6b and the vertical portion 6c, and the bobbin chuck 18 is a chuck pin. It reciprocates along guide groove 6 via 16. For this reason, the moving distance of the bobbin case 12 is the shortest, and smooth and quick replacement of the bobbin case 12 can be realized. In addition, the bobbin hub 11, chuck drive lever 14, chuck slide shaft 4, and chuck drive cylinder 16 can be arranged vertically, horizontally, and longitudinally along the support plate 5, and the overall But It is compact and can save space.

[Example 2]

FIG. 19 shows a second embodiment of the present invention. In the second embodiment, instead of the through groove 16a of the first embodiment, a long shaft groove 24A formed to a predetermined length in the axial direction of the chuck slide shaft 24 is provided as a parallel holding member. ing. A rectangular cross-section end of the chuck pin 16 is slidably fitted in the long shaft groove 24A in a detented state. When the chuck pin 16 slides along the guide groove 6, the chuck slide shaft 24 rotates, and the tip end of the chuck pin 16 slides the longitudinal groove 14A in the longitudinal direction. Xun displaced. As a result, just by forming the shaft long groove 24 A in the chuck slide shaft 24, it is possible to function as a parallel holding member in the same manner as the through groove 16 a of the first embodiment. Contributes to simplified structure

[Modification]

The chuck slide shaft 24 is rotatably supported on the support plate 5 by the shaft pin 25. However, the chuck slide shaft 24 may be supported on a stationary member other than the support plate 5, and in short, the bobbin chuck 1 may be used. Any support structure can be used as long as it can keep 8 parallel to the chuck slide axis 24. One end of the chuck slide shaft 24 may be rotatably supported by a shaft pin 25 on the side where the chuck drive lever 14 exists. In this case, the chuck slide shaft 24 is perpendicular to the horizontal portion 6a of the guide groove 6 at the exchange position K, and perpendicular to the vertical portion 6c at the standby position H. In addition, the axial groove 24 A of the chuck slide shaft 24 may be an elongated recess with a bottom, instead of a through hole that passes through in the thickness direction. Industrial applicability

In the automatic bobbin changing device according to the present invention, the through groove formed in the chuck pin ensures that the bobbin chuck is always in a state parallel to the chuck slide axis while the chuck slide axis reciprocates along the guide groove. , And reciprocate the bobbin chuck to the opposite side of the sewing machine hook. The guide groove of the support plate portion is formed in an inverted L-shape from a horizontal portion, an arc-shaped portion and a vertical portion, and the bobbin chuck reciprocates along the guide groove via the chuck pin. Therefore, the moving distance of the bobbin case becomes the shortest, and the bobbin case can be smoothly and promptly replaced. The productivity is advantageously improved in terms of cost, and is widely applied to the sewing machine manufacturing industry. be able to.

Claims

The scope of the claims

1. A support plate portion which is provided to hang from the sewing table and has an inverted L-shaped guide groove formed from a horizontal portion, an arc portion, and a vertical portion;

A bobbin hub rotatably provided below the sewing machine hook and having a plurality of bobbin cases detachably disposed on an outer peripheral portion thereof;

A chuck drive lever rotatably supported by the support plate portion and having a chuck pin provided at a distal end thereof through the guide groove;

A bobbin chuck that is connected to the chuck pin and that detachably holds the bobbin case with respect to the bobbin hub;

A chuck slide shaft one end of which is rotatably supported by the support plate and the other end of which is slidably connected to the chuck pin;

The chuck slide axis is parallel to the vertical portion of the guide groove via the chuck pin, the standby position where the bobbin chuck grips the bobbin case, and the horizontal position of the guide groove via the chuck pin. A drive member for reciprocatingly rotating the chuck drive lever between the bobbin chuck and a replacement position where the bobbin case is mounted on the sewing machine hook;

The bobbin chuck is provided between the bobbin chuck and the chuck slide shaft, and the bobbin chuck is always in contact with the chuck slide shaft in a process of reciprocating the bobbin chuck and the chuck slide shaft along the guide groove. An automatic bobbin changing device, comprising: a parallel holding member that keeps the bobbin chuck in a parallel state, and that reciprocates the bobbin chuck inward and reciprocally on the opposite side of the sewing machine hook.

2. The bobbin chuck is driven by a chuck drive cylinder. 2. The automatic bobbin changing device according to claim 1, further comprising a check claw that is detachably gripped to hold the bobbin case.

3. The parallel holding member according to claim 1, wherein the parallel holding member is provided in the chuck pin in a direction perpendicular to the axis, and is a through groove that slidably passes through the chuck slide shaft. Automatic bobbin changing device.

4. The parallel holding member according to claim 1, wherein the parallel holding member is formed in an axial direction of the chuck slide shaft, and is a long shaft groove into which a tip of a rectangular cross section of the chuck pin is slidably fitted. Automatic bobbin changer as described

5. The automatic bobbin changing device according to claim 1, wherein the bobbin hub is driven at a predetermined indexing angle by an indexing plate connected to the bobbin hub.

6. The automatic bobbin changing device according to claim 5, wherein the indexing board is driven by an indexing driving cylinder.

7. The automatic bobbin changing device according to claim 6, wherein a brake band is provided for slidingly contacting an outer peripheral portion of the indexing board after the indexing drive of the indexing board for braking.