JPH08191978A - Bobbin changer - Google Patents

Abstract

PURPOSE: To reduce time for matching the positions of a counter member and a case clamping means, to cancel the ejection miss of a bobbin, to surely clamp a case and to reduce time for matching the positions of members for holding a lever between pawls for opening the lever. CONSTITUTION: A pawl 55 is moved into between a lever 2e and a case surface 2h, the surface 2h is pressed with a back 5c, the lever 2e is raised up with a top end 55b, the lever 2e is received by an elastic member 58, held with the pawl 55 and held at an opening position and even when there is core deviation between a counter member 1 and a clamping means 50, the core deviation is canceled by the three-dimensional elastic deformation of the elastic member 58 in the case of attaching/detaching the case to the counter member 1. At the same time, even when there is difference in the opening angle of each lever 2e or the position of a window 2f, the lever 2e can be sufficiently opened by absorbing that difference with the elastic deformation of the elastic member 58 in the opening direction and the lever 2e can be held with the pawl 55 without any gap by the three-dimensional elastic deformation of the elastic member 58.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bobbin changing device.

[0002]

2. Description of the Related Art In a sewing machine for sewing using an upper thread and a lower thread, particularly for an industrial sewing machine that performs high-speed sewing work, it is necessary to frequently replace a bobbin wound with a lower thread. is there. Generally, when the lower thread is consumed, the operation of the sewing machine is temporarily stopped, the bobbin case is removed from the hook, and the bobbin newly wound with the lower thread is accommodated in the bobbin case.
The operation of mounting the bobbin case in the shuttle is performed manually. However, such manual replacement of the bobbin case is extremely inefficient and causes a decrease in productivity.

Therefore, the present applicant has attempted to solve the above problems in the bobbin exchanging device of the sewing machine described in Japanese Patent Application Laid-Open No. 6-304369. This bobbin exchanging device is provided with a bobbin case gripping means. As shown in FIG. 11, the bobbin case gripping means has a tip edge portion of both side plates 88a, 88a arranged side by side in a direction perpendicular to the plane of the drawing. The left side edge portion in the drawing) is pressure-bonded to the outer surface of the bobbin case 2, and, for example, an air cylinder or the like is actuated to convert this actuating force into a rotating force, and the rotating shaft is stretched between the both side plates 88a, 88a. 88b is rotated counterclockwise in the drawing to rotate the lever claw 88c fixed to the rotary shaft 88b counterclockwise, and the tip of the lever claw 88c is locked to the bobbin case 2 in the closed position. The lock lever 2e is moved from the closed position to the open position by causing the lock lever 2e to enter from the tip of the lever 2e (between the lock lever 2e and the bobbin locking plate 2b) to open the lock lever 2e from the closed position. The base body 88m formed on the inclined surface along the lock lever 2e receives it, and the locking hole (window) 2f of the lock lever 2e is inserted into the rectangular trapezoidal convex portion 88n formed on the base body 88m. It is designed to let you.

At this time, the locking claw 2d at the tip of the bobbin locking plate 2b bites into and engages with the bobbin, and the bobbin is gripped so as not to be separated from the bobbin case 2. Then, in a state where the lock lever 2e is opened to the open position, the lock lever 2e is pressed against the base body 88m side by the pressing force of the lever claw 88c to sandwich the bobbin case 2 together with the bobbin case gripping means 88. It can be held.

By rotating the lever claw 88c clockwise in the drawing, the lock lever 2e is returned to its original position so that the bobbin case 2 can be released from the bobbin case gripping means 88.

Further, the bobbin case holding means 88 is
The bobbin case in the hook is held by the bobbin case gripping means 88.
The bobbin case accommodating the bobbin on which the bobbin has been wound can be grasped by the bobbin case grasping means 88 and mounted in the kettle.

[0007]

However, the bobbin exchanging device for a sewing machine described in Japanese Patent Laid-Open No. 6-304369 has the following problems. That is, if the center of the shuttle and the bobbin case gripping means 88 is not completely performed (the center of the shuttle and the axis of the hollow support cylinder of the bobbin case 2 gripped by the bobbin case gripping means 88 are accurately If they do not match each other, the bobbin case 2 cannot be attached to and detached from the hook, so that a great amount of assembly time is required for this centering and the cost of the apparatus increases.

Further, the open position (opening angle) of the lock lever 2e is different due to the manufacturing error of the bobbin case 2, the change over time, and the difference in the specifications of the manufacturer. Even if the lock lever 2e is pressed against the base body 88m by the pressing force and is clamped,
There is a bobbin case in which the opening angle is not sufficient. Therefore, depending on the bobbin case, there is a problem in that the engagement claw 2d is not sufficiently bited into the bobbin and the bobbin is left behind, which lowers the reliability of the apparatus.

Further, since the positions of the locking holes (windows) 2f are different from each other due to the manufacturing error of the bobbin case 2, the difference in the specifications of the manufacturers, etc., the lock lever 2e is pushed by the pressing force of the lever claw 88c. When pressed against the base body 88m, the convex portion 88n on the base body 88m does not enter the locking hole (window) 2f, so that depending on the bobbin case, the bobbin case cannot be gripped and the reliability of the device is improved. There is also the problem of lowering.

When the lock lever 2e is pressed against the base body 88m by the pressing force of the lever claw 88c,
These positions must be adjusted so that there are no gaps between the lever claw 88c and the lock lever 2e and between the lock lever 2e and the base body 88m, and therefore a great deal of assembly is required for these positions. There is also a problem that it takes time and the cost of the device increases.

Therefore, according to the present invention, the bobbin case can be reliably attached to and detached from the facing member even if there is a misalignment between the facing member and the bobbin case gripping means, the assembly time required for the alignment can be reduced, and the bobbin case can be individually mounted. Even if there is a difference in the opening angle of the lock lever or the position of the lock lever window, the lock lever is fully opened regardless of these differences, and the engagement pawl is sufficiently bited into the bobbin, leaving the bobbin left behind. The bobbin exchanging device is solved and the bobbin case is securely gripped, and the assembly time required for aligning the claw member for opening the lock lever and the member for sandwiching the lock lever with the claw member is reduced. The purpose is to provide.

[0012]

In order to achieve the above object, the bobbin exchanging device according to a first aspect of the present invention is capable of gripping the bobbin case by raising a lock lever of the bobbin case accommodating the bobbin inside to an open position. The bobbin case can be opened by returning the lock lever to the closed position, and the bobbin case gripping means for moving the predetermined path is provided. The bobbin is provided inside the member facing the bobbin case gripping means. In a bobbin exchanging device in which a accommodated bobbin case is detachable, the bobbin case gripping means is inserted between the lock lever and an outer surface of the bobbin case, and the rear surface of the bobbin case holds the outer surface of the bobbin case while the tip thereof is held. And a first elastic member that receives the lock lever caused by the claw member that causes the lock lever. And wood, in constructed, and can be held in the open position to sandwich the triggered locking lever between the first elastic member and the pawl member.

In order to achieve the above object, the bobbin exchanging device according to a second aspect of the present invention makes it possible to grasp the bobbin case by raising the lock lever of the bobbin case accommodating the bobbin inside to the open position, and to lock the lock lever. By returning the bobbin case to the closed position, the bobbin case can be opened, and a bobbin case gripping means for moving a predetermined path is provided, and a bobbin case accommodating the bobbin inside is attached to and detached from a member facing the bobbin case gripping means. In the bobbin exchanging device which is made possible, the bobbin case gripping means is inserted between the lock lever and the outer surface of the bobbin case, and the outer surface of the bobbin case is pressed by the rear surface of the bobbin case while causing the lock lever at its tip. A claw member and an edge portion that enters the window of the lock lever caused by the claw member to form the window Receiving a second elastic member, in constructed, and can be held in the open position to sandwich the triggered locking lever between said second elastic member and the pawl member.

In order to achieve the above object, the bobbin exchanging device according to a third aspect of the present invention makes it possible to grasp the bobbin case by raising the lock lever of the bobbin case accommodating the bobbin inside to the open position, and to lock the lock lever. By returning the bobbin case to the closed position, the bobbin case can be opened, and a bobbin case gripping means for moving a predetermined path is provided, and a bobbin case accommodating the bobbin inside is attached to and detached from a member facing the bobbin case gripping means. In the bobbin exchanging device which is made possible, the bobbin case gripping means is inserted between the lock lever and the outer surface of the bobbin case, and the outer surface of the bobbin case is pressed by the rear surface of the bobbin case while causing the lock lever at its tip. A claw member, a first elastic member for receiving the lock lever caused by the claw member, and a claw portion It enters the window of the lock lever caused by the second receiving an edge which forms the window
An elastic member, and the claw member and the first and second claw members.
The lock lever thus caused is held between the elastic member and the elastic member and held in the open position.

In order to achieve the above object, the bobbin exchanging device according to a fourth aspect is characterized in that, in addition to the third aspect, the first elastic member and the second elastic member are integrally molded.

In order to achieve the above object, the bobbin exchanging device according to a fifth aspect of the present invention is, in addition to the second or third or fourth aspect, the second elastic member and at least the outer edge of the lock lever caused by the pawl member. It is characterized in that it is replaced with an elastic member for receiving the portion.

[0017]

According to the bobbin exchanging device of the first aspect, the claw member is inserted between the lock lever and the outer surface of the bobbin case, and the outer surface of the bobbin case is pressed by the back surface of the claw member and the tip thereof. Causes the lock lever to be triggered, and the triggered lock lever is received by the first elastic member and is held between the claw member and the first elastic member to be held in the open position. Therefore, even if there is a misalignment between the opposing member and the bobbin case gripping means, this misalignment is eliminated by the three-dimensional elastic deformation of the first elastic member when the bobbin case is attached to or detached from the opposed member. It Further, even if there is a difference in the opening angle of the lock lever of each bobbin case and a difference in the position of the window of the lock lever, the lock lever absorbs the difference due to the elastic deformation of the first elastic member in the opening direction. It will be released.
Further, the lock lever is sandwiched between the claw member and the first elastic member without a gap by the three-dimensional elastic deformation of the first elastic member.

According to the bobbin exchanging device of the second aspect, the claw member is inserted between the lock lever and the outer surface of the bobbin case, the outer surface of the bobbin case is pressed by the back surface of the claw member, and the tip end of the bobbin case presses the outer surface of the bobbin case. The lock lever is triggered, and a second elastic member is inserted into the window of the triggered lock lever so that an edge portion forming the window is received by the second elastic member and the triggered lock lever is a pawl member. And the second elastic member, and is held in the open position. Therefore, even if there is a misalignment between the opposing member and the bobbin case gripping means, this misalignment is eliminated by the three-dimensional elastic deformation of the second elastic member when the bobbin case is attached to or detached from the opposed member. It Further, even if there is a difference in the opening angle of the lock lever of each bobbin case, the lock lever is elastically deformed in the opening direction of the second elastic member to absorb the difference and be fully opened. Also, even if there is a difference in the position of the window of each lock lever,
The second elastic member does not fit into the window but enters to receive the edge portion, and the lock lever absorbs the difference by elastic deformation of the second elastic member in the opening direction and is fully opened.
Further, the lock lever is sandwiched between the claw member and the second elastic member without a gap by the three-dimensional elastic deformation of the second elastic member.

According to the bobbin exchanging device of the third aspect, the claw member is inserted between the lock lever and the outer surface of the bobbin case, and the outer surface of the bobbin case is pressed by the back surface of the claw member and the tip thereof. The locking lever is triggered, the triggered locking lever being received by the first elastic member, and the window of the triggered locking lever being penetrated by the second elastic member such that the edge forming the window is The lock lever received and raised by the second elastic member is sandwiched between the claw member and the first and second elastic members and held in the open position. Therefore,
Even if there is a misalignment between the facing member and the bobbin case gripping means, this misalignment is eliminated by three-dimensional elastic deformation of the first and second elastic members when the bobbin case is attached to and detached from the facing member. To be done. Further, even if there is a difference in the opening angle of the lock lever of each bobbin case, the lock lever absorbs the difference by the elastic deformation of the first and second elastic members in the opening direction and is fully opened. Further, even if there are differences in the positions of the windows of the individual lock levers, the second elastic member does not fit in the windows but enters the window to receive the edge portion, and the lock lever has the first and second elastic members. By elastic deformation in the opening direction, the difference is absorbed and it is fully opened. Further, the lock lever is sandwiched between the claw member and the first and second elastic members without a gap by the three-dimensional elastic deformation of the first and second elastic members.

According to the bobbin exchanging device of the fourth aspect, the first elastic member and the second elastic member are integrally molded, and the number of parts is reduced.

Further, according to the bobbin exchanging device of the fifth aspect, at least the outer edge portion of the lock lever that is raised is received by the second elastic member, and in the second aspect, the lock lever is a claw member. And the second elastic member to hold the lock lever in the open position. The lock lever is held between the claw member and the first and second elastic members in the open position. Held in. Therefore, the same effect as that of claim 2 or 3 or 4 is achieved.

[0022]

Embodiments of the present invention will now be described in detail with reference to the drawings. 4 to 9 show the entire bobbin exchanging device of the present invention. 4 to 9,
Reference numeral 1 denotes a shuttle in which the bobbin case 2 is mounted, 1a denotes a shuttle shaft, and 3 denotes a base plate which is erected upright on a main base attached to the main body of the sewing machine and which is disposed immediately below the shuttle 1. A base end 4a of a carrier shaft 4 having an axis parallel to the shuttle shaft 1a is fixed to the base plate 3, and the carrier shaft 4 is cantilevered by the base plate 3.

On the tip 4b side (opposite to the base plate side) of the conveying shaft 4, a conveying block 12 is formed so that the outer peripheral surface of the hollow cylinder is cut at two locations along the axial direction so that the cut surfaces face each other. 4) is rotatably and slidably supported on the transport shaft 4.

To each cut surface of the carrier block 12, one plate-like portion of the L-shaped carrier plates 10, 10 constituting the L-shape is fixed, and the other part constituting the L-shape is fixed. As shown in FIG. 4, the plate-shaped portions of the two are opposed to each other with the axis interposed therebetween.

One end of each of the holding portions 11, 11 bent toward the shuttle along the axial direction is fixed to each of the transport plates 10, 10, and the other of the holding portions 11, 11 is fixed. The bobbin case gripping means 50 as shown in FIGS. 1 to 3 is fixed to each end (end facing the shuttle). 4 to 9, the bobbin case holding means 50 is omitted in order to avoid making the drawings complicated. Next, the bobbin case holding means will be described below with reference to FIGS. 1 to 3.

A U-shaped support plate 53 as shown in FIGS. 2 and 3 is fixed to the holding portion 11 so as to be opened downward in FIG.
A nail shaft 54 is rotatably provided between a and 53b. On this nail shaft 54, a claw referred to as a nail that causes the lock lever 2e of the bobbin case 2 to be raised from the closed position (see FIG. 3A) to be opened to the open position (see FIG. 3C). A member 55 is attached. The nail 55 is curved in an arc shape, and the tip portion 55b of the nail 55 is arranged in such a position that it can be inserted into the overlapping portion of the lock lever 2e of the bobbin case 2 and the bobbin locking plate 2b. .

A part of the nail 55 (the lower part in FIG. 3) projects outward from between the side plates 53a and 53b, and a pin 55a is projected on the side plate 53b side surface of this projecting portion. . A link shaft 57 is provided on the outer surface of the side plate 53b so as to project therefrom. A substantially square V-shaped link 56 is rotatably supported on the link shaft 57. Notches 56a and 56b are formed at both ends of the link 56, and the pin 55 of the nail 55 is formed in the notch 56a.
a is the plunger 51 of the solenoid 51 in the notch 56b.
Pins 51b projecting from a are loosely fitted and arranged. The solenoid 51 is fixed to the holder 11.

As shown in FIGS. 1 and 3, on the support plate 53, a leaf spring 58 as a first elastic member is provided between both side plates 53a and 53b and stands up toward the nail 55 side. The leaf spring 59 as the second elastic member is fixed. Tip 59a of leaf spring 59
Is bent to the bobbin case 2 side, and the window 2f of the lock lever 2e caused by the nail 55 is generated.
Is arranged in such a positional relationship that it can enter into and receive the edge portion 2i forming the window 2f. Then, when the window 2f is received by the second elastic member 59 in the vertical direction of FIG. 1, there is a predetermined gap assuming the play of the lock lever 2e.

The tip portion 58a of the leaf spring 58 is bent in the opposite direction to the tip portion 59a of the leaf spring 59 and can receive the outer surface 2g of the lock lever 2e caused by the nail 55. It is arranged in a possible positional relationship. The lock lever 2e received by the leaf springs 58 and 59 is clamped and fixed in an open state by the pressing force from the nail 55, so that the entire bobbin case 2 is gripped. ing.

In FIG. 3, reference numeral 1A indicates an outer pot,
1B has shown the inner pot accommodated in 1 A of outer pots, respectively.

By the way, a rotating gear 13 is fixed to the outer periphery of the carrying block 12 as shown in FIGS. 4 to 7. As shown in FIG. 5, a drive gear 19 having a long shape meshes with the rotary gear 13 along the direction of the shuttle shaft 1a. One end of the drive gear 19 is rotatably supported by a portion of the motor fixing plate 21 attached to the base plate 3 that protrudes toward the other end of the transport shaft, and the other end is fixed to the motor fixing plate 21. The rotary shaft 20 is directly connected to the output shaft of the rotary motor 20.

Therefore, when the rotation motor 20 rotates, the transfer block 12 is moved through the drive gear 19 and the rotation gear 13.
A rotating arm 70 composed of the carrier plates 10, 10 and the holding portions 11, 11 is adapted to rotate. In this embodiment, the rotating operation of the rotating arm 70 is performed when the rotating arm 70 is in the retracted position (see FIGS. 5 to 7). Further, the transport shaft 4 is cantilevered, but since it is guided by the drive gear 19, its supporting strength is sufficient.

A not-illustrated stop ring, for example, is fixed to the outer periphery of the transport block 12 on the fixed end side of the transport shaft 4 with respect to the rotary gear 13, and the rotary gear 13 and the stop on the outer periphery of the transport block 12 are fixed. A linear motion collar 14 is rotatably supported between the ring and the ring.

As shown in FIG. 6, one end of a linear motion link 15 is pivotally attached to the linear motion collar 14. The other end of the linear motion link 15 is pivotally attached to one end of a dogleg-shaped drive link 16, and the bent portion forming the dogleg of the drive link 16 is fixed to the base plate 3. It is pivotally attached to the bracket. The other end of the drive link 16 is
It is pivotally attached to a knuckle 17 of an air cylinder 18 fixed to the base plate 3.

Therefore, when the air cylinder 18 is driven, the rotary arm 70 moves along with the linear movement collar 14 along the axial direction of the transport shaft 4 via the knuckle 17, the drive link 16, and the linear motion link 15. Has become. That is, the rotating arm 70 can rotate with respect to the transport shaft 4 and can slide along the transport shaft 4.

A sensor fixing plate 33 is rotatably attached to the open end side of the carrying shaft 4, and a rotation sensor composed of a light emitting element 31a and a light receiving element 31b is mounted on the sensor fixing plate 33. 31 is attached. Further, as shown in FIGS. 3 and 4, the rotating arm 70 has
The sensor plate 32 is fixed, and when the rotating arm 70 is rotated, the sensor plate 32 causes the light emitting element 31a and the light receiving element 31 to be detected.
The positions of the rotation sensor 31, the sensor fixing plate 33, and the sensor plate 32 are adjusted so that they can pass through the space b.

A dummy shaft 6 as a bobbin case holding means is provided at a position opposite to the rotation locus of the bobbin case gripping means on the base plate 3, for example, at positions D and E, as shown in FIG. Each is fixed. As shown in FIG. 9, the dummy shaft 6 has the same structure as the tip of the shuttle shaft 1a, and can hold the bobbin case 2 by pushing the bobbin case 2 containing the bobbin. . And the bobbin case 2 that was pushed in
As shown in FIG. 8, the existing bobbin locking claw 2d of
It is configured to engage with the locking groove of the rotation preventing member 5aa provided in the vicinity of the dummy shaft 6. That is, the bobbin case 2 is positioned and held at a predetermined position.

A residual yarn removing device is provided at a position opposite to the rotation locus of the bobbin case gripping means, for example, at a position C, as shown in FIG. This residual thread removing device is in a state where the bobbin case 2 is held by the bobbin case holding means 50 or a state where the bobbin case is transferred to a holding shaft having the same structure as the dummy shaft 6 and the bobbin case is held. Then, as long as the bobbin is rotated by the yarn drawing operation of the drawing means for drawing the yarn wound on the bobbin, the yarn wound on the bobbin may be drawn out, For example, Japanese Patent Application No. 5-203 previously filed by the applicant
Appropriate ones can be adopted, including the bobbin residual yarn removing device described in Japanese Patent Application No. 610 and Japanese Patent Application No. 6-40351.

A bobbin winding device is arranged at a position opposite to the rotation locus of the bobbin case holding means, for example, at a position F, as shown in FIG. As this bobbin winding device, any device can be used as long as the bobbin can be automatically wound around a bobbin by driving a motor or the like, and then the bobbin case 2 can be hooked and the bobbin can be cut. For example, the bobbin exchanging device of Japanese Unexamined Patent Publication No. 5-192476 or the bobbin exchanging device of the sewing machine and Japanese Patent Application No. 5-116363 of Japanese Patent Application No. 5-121960 previously filed by the present applicant. Appropriate ones can be adopted, including the lower thread winding device described in the bobbin changing device of the sewing machine in the specification.

When the residual thread removing device and the bobbin winding device contact the base plate 3, the base plate 3 is appropriately cut. Further, in FIG. 8, the residual thread removing position C
The bobbin winding device F and the dummy shafts 6 and 6 are close to each other, and the holding portion 11 is exaggerated. Therefore, when the holding unit 11 moves to the shuttle 1 and the dummy shaft 6, there is a concern that the holding unit 11 may come into contact with the residual yarn removing device or the bobbin winding device. However, in practice, such contact should be avoided. Enough space is secured.

By the way, in the present embodiment, the bobbin case holding means 50 can be moved by the air cylinder 18 to the bobbin case attaching / detaching position (hook position) and the retracted position moved to the opposite hook side. Then, the origin position is searched at the retracted position (see FIGS. 5 to 7). Therefore, one of the bobbin case gripping means is moved to the retracted position facing the shuttle 1 and then rotated, so that the sensor plate 32 shields the space between the light emitting element 31a and the light receiving element 31b with respect to the transport shaft 4. When the sensor fixing plate 33 is fixed, when the rotation motor 20 is a pulse motor, for example, by counting the number of pulses of the pulse motor, the bobbin case gripping means 50 is moved to the bobbin position A, the bobbin winding position. The rotation can be controlled to the turning position F, the residual yarn removing position C, and the dummy positions D and E.

Next, the operation of the apparatus thus constructed will be described below. First, for example, in order to allow both bobbin case gripping means 50a and 50b (for convenience of description, ab is added after the number to distinguish them) to grip the bobbin case accommodating the bobbin wound with bobbin, Similar to mounting the bobbin case accommodating the bobbin wound with the lower thread by inserting the hand from the rotary arm side to the shuttle shaft 1a,
Push the bobbin cases into the dummy shafts 6 and 6 by pushing them into the dummy shafts 6 and 6 without returning the palms. It is very easy to attach the bobbin case to the dummy shafts 6 and 6 by this manual work.

Next, when the power switch is turned on, the rotating arm 70 is returned to the original position. At this time, the solenoid 51 is not energized, the tip portion 55b of the nail 55 is in the retracted position as shown in FIG. 3A, and the lock lever 2e of the bobbin case 2 is in the closed position. Then, when the start switch is turned on, the rotating arm 70 is rotated to rotate one of the bobbin case holding means 50.
a is opposed to the dummy position D or E. Next, the rotating arm 70 is moved forward so that the bobbin case holding the bobbin wound on the dummy shaft 6 is held by one of the bobbin case holding means 50a. In addition,
FIG. 3 shows an example of taking out the bobbin case from the shuttle shaft 1a.
It is the same even if replaced with.

That is, from the state shown in FIG. 3A, the nail 55 is rotated toward the opening direction by the retracting operation of the plunger 51a of the solenoid 51, and the tip portion 55b of the nail 55 is moved to the bobbin at the closed position. The lock lever 2e of the case 2 is caused to enter the inside from the front end portion thereof, and the lock lever 2e is raised from the closed position and released. At this time, the back surface 55c of the nail 55 causes
As shown in (b), the outer surface 2h of the bobbin case 2
Is pressed. When the released lock lever 2e is opened to the open position, the tip portion 59a of the leaf spring 59 enters the window 2f of the opened lock lever 2e, and the edge portion 2i forming the window 2f by the tip portion 59a. Can be received. Then, the lock lever 2e is pressed in the Y direction shown in FIG. At the same time, the outer surface 2 of the lock lever 2e released by the tip portion 58a of the leaf spring 58.
g can be received. Then, with the lock lever 2e opened, the lock lever 2e is pressed against the leaf springs 58 and 59 and clamped by the pressing force of the nail 55, and as a result, the entire bobbin case 2 is held by the bobbin case gripping means 5.
It is grasped at 0. Further, by maintaining the lock lever 2e in the open state in this way, the bobbin case 2 is set in a free state in which it can be detached from the dummy shaft 6, and the bobbin is held so as not to be detached from the bobbin case 2. To be done. Then, as shown in FIG. 3C, the bobbin case gripping means 50 is retracted.

Therefore, even if there is a misalignment between the dummy shaft 6 and the bobbin case gripping means 50, this misalignment is caused by the leaf springs 58 when the bobbin case 2 is taken out from the dummy shaft 6.
It is canceled by the three-dimensional elastic deformation of 59, and the dummy shaft 6
It is possible to reliably take out the bobbin case 2 from. That is, the dummy shaft 6 and the bobbin case holding means 50 can be roughly aligned with each other, and the assembly time required for this alignment can be reduced.

The lock lever 2 for each bobbin case
Even if there is a difference in the opening angle of e, the lock lever 2e can be sufficiently opened by absorbing the difference by elastic deformation of the leaf springs 58 and 59 in the opening direction, so that the locking claw 2d of the bobbin case 2 can be moved to the bobbin. It has become possible to fully dig in, and it is possible to eliminate the bobbin left behind.

The lock lever 2 for each bobbin case
Even if there is a difference in the position of the window 2f of e, the tip end 59a of the leaf spring 59 is not inserted into the window 2f but is advanced to receive the edge portion 2i and the lock lever 2e is moved in the opening direction of the leaf springs 58 and 59. Since the difference is absorbed by the elastic deformation of the bobbin case 2 so that the bobbin case 2 can be fully opened, the bobbin case 2 can be reliably gripped.

Further, the lock lever 2 is attached to the leaf springs 58 and 59.
By the three-dimensional elastic deformation of the nail 55 and the leaf spring 5
Since it can be sandwiched between the members 8 and 59 without any gap, the members can be roughly aligned, and the assembly time required to align the members can be reduced.

Now, returning to the explanation of the operation again, the rotating arm 70 retracted to the retracted position is rotated. Then, one bobbin case holding means 50a holding the bobbin case is opposed to the shuttle 1 and moved forward, and the bobbin case accommodating the bobbin on which the lower thread has been wound is installed in the shuttle.

The bobbin case holding means 50a mounts the bobbin case by reversing the operation procedure shown in FIG. That is, when the bobbin case 2 is inserted into the shuttle 1, the energization of the solenoid 51 is released and the nail 55 of the bobbin case gripping means 50a is opened, whereby the bobbin case 2 is mounted in the shuttle 1.

At this time, the shuttle 1 and the bobbin case holding means 50
Even if there is a misalignment between the and, this misalignment is eliminated by the three-dimensional elastic deformation of the leaf springs 58, 59 when the bobbin case 2 is attached to the shuttle 1, and the bobbin case 2 relative to the shuttle 1 is removed. It can be mounted securely.

Then, when the rotating arm 70 is retracted and sewing is started, one of the bobbin case gripping means (for convenience of explanation, the bobbin case gripping means 50b for convenience of explanation) is operated by the same operation as above during the sewing. Then, the bobbin case containing the bobbin wound with the bobbin thread held on the dummy shaft 6 is gripped, and the rotating arm 70 is retracted.

If a bobbin replacement command is issued due to, for example, the amount of remaining yarn on the bobbin in the shuttle being reduced,
The sewing operation of the sewing machine is prohibited, the rotating arm 70 is rotated, the bobbin case holding means 50a not holding the bobbin case is made to face the hook 1 and is moved forward, and the bobbin with less residual thread is moved inside the hook. Take out from.

Removal of the bobbin case by the bobbin case gripping means 50a is similar to the operation procedure shown in FIG. Therefore, the bobbin case gripping means 50 allows the hook 1
On the other hand, even when the bobbin case is taken out, the same action and effect as when the bobbin case is taken out from the dummy shaft 6 by the bobbin case holding means 50 can be obtained.

Then, the rotating arm 70 is retracted and rotated to make the bobbin case containing the bobbin wound bobbin face the shuttle 1 and move forward to move the bobbin case containing the bobbin wound bobbin. The rotary arm 70 is retracted by mounting it in the shuttle.

When the sewing is started, the rotating arm 70 is rotated during the sewing so that the bobbin with less residual thread faces the residual thread removing device, and the bobbin case is removed by the residual thread removing device. The residual thread of the bobbin contained in the bobbin is removed, and the bobbin is used as an empty bobbin with no thread.

Then, the rotating arm 70 is rotated so that the empty bobbin faces the bobbin winding device, and the rotating arm 7 is rotated.
0 is advanced, the lower thread is wound around the empty bobbin by the lower thread winding device, and the thread is hooked on the bobbin case and the lower thread is cut.

In this way, when the bobbin is wound around the bobbin, the rotary arm 70 is retracted to the standby state, and when the next bobbin replacement command is issued, the sewing operation of the sewing machine is prohibited, The rotating arm 70 is rotated so that the bobbin case gripping means 50b that does not grip the bobbin case faces the shuttle 1 and is advanced, and the bobbin with less remaining thread is taken out from the shuttle and the rotating arm 70 is retracted. Let

Then, the rotating arm 70 is rotated and moved forward, the bobbin wound with the lower thread by the lower thread winding device is mounted in the shuttle, and the rotating arm 70 is retracted.
After that, the above operation is repeated.

By the way, there is a case where the bobbin case 2 held by the bobbin case holding means 50 is taken out or the bobbin case 2 is temporarily held by the dummy shaft 6 in order to use different color bobbins. The bobbin case gripping means 50 gripping the bobbin case 2 faces the dummy shaft 6 and is moved forward to transfer the bobbin case 2 gripped by the bobbin case gripping means 50 to the dummy shaft 6. You can

Therefore, even when the bobbin case is mounted on the dummy shaft 6 by the bobbin case gripping means 50, the same action and operation as when mounting the bobbin case on the hook 1 by the bobbin case gripping means 50 are performed. Produce an effect.

When the bobbin case 2 held by the dummy shaft 6 is to be taken out, if the hand is inserted from the rotary arm side, the palm is not returned, as in the case of taking out the bobbin case 2 from the shuttle shaft 1a. The bobbin case held by the dummy shaft 6 can be taken out. It is very easy to take out the bobbin case from the dummy shafts 6 and 6 by this manual work.

Although the invention made by the present inventor has been specifically described based on the embodiments, the invention is not limited to the above embodiments and various modifications can be made without departing from the scope of the invention. Needless to say, for example, the leaf spring 59 of the above embodiment may be replaced with a leaf spring 159 having a U-shaped cross section as shown in FIG. The leaf spring 159 is configured to sandwich at least the outer edge portions 2x and 2y of the lock lever 2e caused by the nail 55 (in the figure, the outer surface 2g is also received). It goes without saying that even with this configuration, it is possible to obtain the same effects as in the above embodiment.
Further, at least the outer edge portions 2x, 2y of the lock lever 2e.
You may receive instead of sandwiching.

Further, in the above embodiment, since it is particularly effective, both the leaf springs 58 and 59 (159) are used to hold the lock lever 2e between the nail 55 and the leaf spring. Only one of 58 and 59 (159) may be used.

Further, in the above embodiment, the leaf spring 5
Although 8, 59 (159) are separate members, they may be integrally molded to reduce the number of parts.

Further, in the above embodiment, the leaf spring is used as the elastic member, but it is also possible to replace it with an elastic member other than the leaf spring.

Further, the dummy shaft 6 as the bobbin case holding means may be replaced with a bobbin case holding means for magnetically attracting the bobbin case 2 by a magnet to accommodate / hold it in the holder.

Further, the dummy positions D and E, the bobbin thread winding position F, and the residual yarn removing position C are not limited to the positions in the above-mentioned embodiment, and in short, these positions are the bobbin case gripping means 5.
It suffices if it is at the opposite position of the moving trajectory of 0.

[0069]

As described above, according to the bobbin exchanging device of the first aspect, the claw member is inserted between the lock lever and the outer surface of the bobbin case, and the outer surface of the bobbin case is secured by the back surface thereof. The lock lever is pressed by the tip of the lock lever, and the lock lever thus caused is received by the first elastic member and is held between the claw member and the first elastic member to hold the lock lever in the open position. Even if there is misalignment with the case gripping means, this misalignment
Since the first elastic member is configured to be three-dimensionally elastically deformed when attaching and detaching the bobbin case to and from the facing member, the bobbin case can be reliably attached to and detached from the facing member. It is possible to reduce the assembly time required for aligning the facing member and the bobbin case gripping means. Further, even if there is a difference in the opening angle of the lock lever or the position of the window of the lock lever of each bobbin case, the lock lever can be elastically deformed in the opening direction of the first elastic member to absorb the difference and be fully opened. With this configuration, it is possible to sufficiently bite the locking claw into the bobbin, it is possible to eliminate the remaining bobbin, and it is possible to reliably grip the bobbin case. Further, since the lock lever is configured so as to be sandwiched between the claw member and the first elastic member without a gap by three-dimensional elastic deformation of the first elastic member, it is necessary to position these members. It is possible to reduce the assembly time.

According to the bobbin changing device of the second aspect, the claw member is inserted between the lock lever and the outer surface of the bobbin case, the outer surface of the bobbin case is pressed by the back surface of the claw member, and the tip is locked by the tip. The lever is caused, the second elastic member is made to enter the window of the caused lock lever, and the edge portion forming the window is received by the second elastic member, and the caused lock lever is engaged with the claw member and the second elastic member. Hold it in the open position by pinching it with the member,
Even if there is a misalignment between the facing member and the bobbin case gripping means, this misalignment is eliminated by three-dimensional elastic deformation of the second elastic member when the bobbin case is attached to or detached from the facing member. Therefore, the bobbin case can be surely attached to and detached from the facing member, and the assembling time required for aligning the facing member and the bobbin case gripping means can be reduced. Further, even if there is a difference in the opening angle of each lock lever of the bobbin case, the lock lever is configured to be able to absorb the difference by elastic deformation in the opening direction of the second elastic member and be sufficiently opened. The engagement pawl can be sufficiently bited into the bobbin, and the bobbin can be left unremoved. Further, even if there is a difference in the window position of the lock lever of each bobbin case, the second elastic member is not inserted into the window but is inserted to receive the edge portion, and the lock lever is opened to the second elastic member. Since the difference is absorbed by the elastic deformation in the direction so that the difference can be sufficiently opened, the bobbin case can be reliably gripped. Further, since the lock lever can be clamped by the three-dimensional elastic deformation of the second elastic member without a gap between the claw member and the second elastic member, it is necessary to position these members. It is possible to reduce the assembly time.

According to the bobbin exchanging device of the third aspect, the claw member and the first and second elastic members according to the first or second aspect sandwich the lock lever between them and hold the lock lever at the open position. Since it is configured so that it can be performed, the effect of claim 1 or 2 can be made more reliable.

According to the bobbin exchanging device of the fourth aspect, in addition to the third aspect, the first elastic member and the second elastic member are integrally molded to reduce the number of parts. Therefore, it is possible to reduce the management cost.

According to the bobbin exchanging device of claim 5, in addition to claim 2, 3 or 4, at least the outer edge portion of the lock lever caused is received by the second elastic member, and the bobbin exchanging device according to claim 2 is also adopted. In this case, the lock lever is clamped between the claw member and the second elastic member and held in the open position. In the third aspect, the lock lever is held between the claw member and the first and second elastic members. Since it is configured to be sandwiched between and to be held in the open position, it is possible to obtain the same effect as that of claim 2 or 3 or 4.

[Brief description of drawings]

FIG. 1 is a perspective view showing a bobbin case holding means of a bobbin changing device according to an embodiment of the present invention.

FIG. 2 is a view of the bobbin case holding means of FIG. 1 viewed from the X direction.

FIG. 3 is an operation explanatory view showing the operation of the bobbin case gripping means of the above.

FIG. 4 is a front view of the above bobbin changing device.

FIG. 5 is a plan view of the above bobbin changing device.

FIG. 6 is a left side view of the above bobbin changing device.

FIG. 7 is a right side view of the above bobbin changing device.

FIG. 8 is a schematic front view for explaining a dummy position and a dummy shaft of the bobbin changing device of the above.

FIG. 9 is a schematic side view for explaining a dummy position and a dummy shaft of the bobbin changing device of the above.

FIG. 10 is a vertical cross-sectional view showing another example of the second elastic member in the bobbin case holding means.

FIG. 11 is a side view showing a bobbin case gripping means in the prior art.

[Explanation of symbols]

 1,6 Opposing member 2 Bobbin case 2e Lock lever 2f Lock lever window 2h Bobbin case outer surface 2i Window edge 50 Bobbin case gripping means 55 Claw member 55b Claw member tip 55c Claw member back 58 First elasticity Member 59,159 Second elastic member

Claims (5)

[Claims] 1. A bobbin case accommodating a bobbin inside thereof can be gripped by raising the lock lever to an open position, and by returning the lock lever to a closed position, the bobbin case can be opened. A bobbin case gripping means for moving the path of the bobbin case gripping means, wherein a bobbin case accommodating the bobbin inside the bobbin case is attachable to and detachable from a member facing the bobbin case gripping means. A claw member that enters between the lock lever and the outer surface of the bobbin case and presses the outer surface of the bobbin case at its rear surface and causes the lock lever at its tip, and the lock lever caused by the claw member. A first elastic member for receiving the claw member and the first elastic member. Holdable and the bobbin exchanging device in the open position by holding the lock levers. 2. A bobbin case housing a bobbin inside thereof can be grasped by raising the lock lever to an open position, and the bobbin case can be opened by returning the lock lever to a closed position. A bobbin case gripping means for moving the path of the bobbin case gripping means, wherein a bobbin case accommodating the bobbin inside the bobbin case is attachable to and detachable from a member facing the bobbin case gripping means. A claw member that enters between the lock lever and the outer surface of the bobbin case and presses the outer surface of the bobbin case at the back surface thereof to cause the lock lever at its tip, and a claw member of the lock lever caused by the claw member. A second elastic member that enters the window and receives an edge portion that forms the window; Holdable and the bobbin exchanging device in the open position to sandwich the triggered locking lever between the second elastic member. 3. A bobbin case that accommodates a bobbin inside thereof can be grasped by raising the lock lever to an open position, and the bobbin case can be opened by returning the lock lever to a closed position. A bobbin case gripping means for moving the path of the bobbin case gripping means, wherein a bobbin case accommodating the bobbin inside the bobbin case is attachable to and detachable from a member facing the bobbin case gripping means. A claw member that enters between the lock lever and the outer surface of the bobbin case and presses the outer surface of the bobbin case at its rear surface and causes the lock lever at its tip, and the lock lever caused by the claw member. The first elastic member to be received and the window of the lock lever caused by the claw member A second elastic member that receives an edge portion that forms the window, and holds the raised lock lever between the claw member and the first and second elastic members and holds the lock lever in the open position. Possible bobbin changer. 4. The bobbin exchanging device according to claim 3, wherein the first elastic member and the second elastic member are integrally formed. 5. The bobbin exchanging device according to claim 2, 3 or 4, wherein the second elastic member is replaced with an elastic member that receives at least the outer edge portion of the lock lever caused by the claw member. Bobbin changing device.