JP3593380B2 - Bobbin winding device - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an apparatus for winding a bobbin thread on a bobbin.
[0002]
[Prior art]
2. Description of the Related Art In a sewing machine that performs sewing using an upper thread and a lower thread, particularly an industrial sewing machine that performs high-speed sewing work, it is necessary to frequently replace the bobbin around which the lower thread is wound. Generally, when the bobbin thread is consumed, the operation of the sewing machine is temporarily stopped, the bobbin case is removed from the shuttle, the bobbin in the bobbin case is taken out, the bobbin thread is wound around the bobbin, and the bobbin thread is newly A series of operations of manually storing the wound bobbin in the bobbin case and mounting the bobbin case in the shuttle is performed manually.
[0003]
However, such manual operation of winding the bobbin thread on the bobbin and replacing the bobbin case are extremely inefficient and cause a decrease in productivity. The inventors of the present application have proposed a bobbin changing device and a bobbin winding device for a sewing machine in Japanese Patent Application Laid-Open No. 6-304369 filed earlier. The bobbin exchanging device according to such a proposal has bobbin case gripping means for gripping and holding a bobbin case containing a bobbin therein, and the bobbin case gripping means moves forward and backward with respect to the shuttle. It is configured to be able to. Then, the bobbin case in which the bobbin thread has been consumed is first held by the bobbin case gripping means, pulled out of the bobbin, and then conveyed to the bobbin winding position.
[0004]
A bobbin winding device is disposed at the bobbin winding position.A bobbin in the bobbin case is engaged with a rotation output shaft of a bobbin driving mechanism provided in the bobbin winding device, and the bobbin driving mechanism is provided with a bobbin driving device. The bobbin in the bobbin case is configured to be given a rotational driving force.
[0005]
[Problems to be solved by the invention]
However, in the bobbin exchanging device and the bobbin winding device having such a configuration, when the bobbin in the bobbin case is engaged with the rotation output shaft of the bobbin driving mechanism, the centering of both bobbins is accurately performed. There is a need. That is, if the centers of the two are displaced from each other, there is a possibility that abnormal noise is generated, abrasion occurs in the engagement portion, and furthermore, the amount of rotation cannot be accurately controlled. On the other hand, if each component is made to have high precision and high performance in order to accurately align the two, not only will the production cost rise sharply, but also the structure becomes complicated and the productivity is reduced.
[0006]
Then, an object of the present invention is to provide a lower thread winding device which can perform favorable lower thread winding with a simple configuration.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a bobbin thread winding device according to claim 1, wherein the bobbin thread is wound around a bobbin in a bobbin case held by a predetermined bobbin case gripping means, A bobbin driving mechanism for applying a rotational driving force to the bobbin by engaging a winding shaft with the bobbin inside the bobbin; and aligning and guiding the bobbin case so that the center axis of the bobbin case matches the winding shaft of the bobbin driving mechanism. A bobbin winding mechanism provided with a bobbin case guide member; Step by step At least one side of the gripped bobbin case is substantially perpendicular to the winding shaft in accordance with a guiding force generated between the bobbin case guide member and the bobbin case. Who It is configured to be movable in the direction.
[0008]
In the bobbin winding device according to the second aspect, The bobbin case guide member according to claim 1 is: It is formed to protrude so as to contact a part of the bobbin case. Tapi The distal end portion of the spring member is formed in a pointed shape.
[0009]
Further, in the bobbin winding device according to the third aspect, the bobbin case guide member according to the first or second aspect is provided as a non-rotating member to which the rotational force from the bobbin driving mechanism is not transmitted.
[0010]
Further, in the bobbin winding device according to the fourth aspect, the bobbin case guide member according to the first, second, or third aspect is provided with a bobbin guide member for guiding the bobbin to the bobbin winding position.
[0011]
[Action]
According to the bobbin winding device according to claim 1 or 2, when the bobbin case held by the bobbin case gripping means is conveyed so as to face the bobbin driving mechanism, the bobbin case is provided on the bobbin driving mechanism side. The guide force of the bobbin case guide member acts on the bobbin case, and the bobbin drive mechanism and the bobbin case gripping means move so as to be relatively close to each other according to the guide force. The shaft is centered so that both are accurately aligned.
[0012]
Further, according to the bobbin winding device according to the third aspect, in addition to the operation of the device according to the first or second aspect, relative rotation between the bobbin case guide member and the bobbin case is avoided, and wear of both members is reduced. Etc. are prevented.
[0013]
According to the bobbin winding device according to the fourth aspect, in addition to the operation of the device according to the first or second or third aspect, after the bobbin case is accurately aligned with the bobbin driving mechanism, the bobbin guide member is further provided. As a result, the bobbin itself is centered on the bobbin driving mechanism side, thereby enabling more accurate alignment, and furthermore, the abrasion between the bobbin case guide member and the bobbin case is more reliably prevented. I have.
[0014]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the bobbin automatic supply device according to the present embodiment includes a bobbin winding device 162, a residual yarn removing device 161, and a bobbin exchanging device 160. The replacement device 160 includes a bobbin winding position C of the bobbin winding device 162, a residual yarn removing position B of the residual yarn removing device 161, a shuttle position (bobbin case attaching / detaching position) A, and a bobbin of the dummy shaft (bobbin case holding means) 6. The bobbin case 2 is configured to move to the case attaching / detaching position D. The bobbin thread automatic supply device 162 is provided below the sewing machine bed 101, and the bobbin exchanging device 160 will be described below with reference to FIGS.
[0015]
2 to 6, reference numeral 1 denotes a shuttle to which the bobbin case 2 is mounted, reference numeral 1a denotes a hook shaft, and reference numeral 3 denotes an upright standing on a main base attached to the sewing machine main body and disposed directly below the shuttle 1. A base plate as a supporting member is shown, and a base end 4a of a transport shaft 4 having an axis parallel to the shuttle shaft 1a is fixed to the base plate 3, and the transport shaft 4 is In a cantilevered state.
[0016]
A transport block 12 is rotatably and slidably supported on the transport shaft 4 on the end 4b side (opposite the base plate side) of the transport shaft 4. As shown in FIG. 2 in particular, the transport block 12 has a shape in which the outer peripheral surface of the cylinder is cut at two places along the axial direction and the cut surfaces are formed so as to face each other. To each cut surface of the transport block 12, one of the L-shaped transport plates 10, 10 is fixed. Further, the other plate-like portions constituting the L-shape are in a state of facing each other with the axis interposed therebetween.
[0017]
One end of each of the holding portions 11, 11 bent to extend toward the shuttle along the axial direction is fixed to each of the transfer plates 10, 10. A bobbin case gripping means (not shown) for gripping or opening the bobbin case is fixed to the other end (the end facing the hook side). The bobbin case gripping means will be described below with reference to FIGS.
[0018]
In other words, a U-shaped support plate 53 provided on the bobbin case gripping means as shown in FIGS. 8 and 9 is fixed to the holding portion 11 so as to be opened downward in FIG. A nail shaft 54 is rotatably extended between the side plates 53a and 53b. The nail shaft 54 is provided with a nail called a nail that raises the lock lever 2e of the bobbin case 2 from the closed position (see FIG. 9A) and opens the lock lever 2e to the open position (see FIG. 9C). A member 55 is attached. The nail 55 is formed in a curved shape in an arc shape, and the distal end portion 55b of the nail 55 is arranged in a positional relationship such that it can be inserted into an overlapping portion between the lock lever 2e of the bobbin case 2 and the bobbin locking plate 2b. .
[0019]
A part of the nail 55 (the lower part in FIG. 9) protrudes outward from between the side plates 53a and 53b, and a pin 55a protrudes from a surface of the protruding portion on the side plate 53b side. A link shaft 57 is protruded from an outer surface of the side plate 53b, and a substantially U-shaped link 56 is rotatably supported on the link shaft 57. Notches 56a and 56b are formed at both ends of the link 56, respectively. The notch 56a has a pin 55a of the nail 55, and the notch 56b has a pin 51b projecting from a plunger 51a of the solenoid 51. The fitting is arranged. The solenoid 51 is fixed to the holding section 11.
[0020]
As shown in FIGS. 7 and 9, the support plate 53 has a leaf spring 58 as a first elastic member which is provided between the side plates 53a and 53b and stands upright toward the nail 55, and a second spring. A leaf spring 59 as an elastic member is fixed respectively. The tip portion 59a of the leaf spring 59 is bent toward the bobbin case 2 and can enter the window 2f of the lock lever 2e caused by the nail 55 and receive the edge 2i forming the window 2f. Are arranged in a proper positional relationship. When the window 2f is received by the second elastic member 59 in the up-down direction in FIG. 7, there is a predetermined gap assuming play of the lock lever 2e.
[0021]
The distal end 58a of the leaf spring 58 is bent in a direction opposite to the distal end 59a of the leaf spring 59, and can receive the outer surface 2g of the lock lever 2e caused by the nail 55. Are located in The lock levers 2e received by the leaf springs 58, 59 are clamped and fixed in an open state by the pressing force from the nail 55, whereby the entire bobbin case 2 is gripped. ing.
[0022]
In FIG. 9, reference numeral 1A denotes an outer shuttle, and 1B denotes an inner shuttle accommodated in the outer shuttle 1A. However, even if these are replaced with a lower thread winding device 162 or the like described later, the bobbin case 2 is gripped. , A similar operation is performed. That is, in the bobbin case gripping means 50 in this embodiment, the bobbin case 2 is provided so as to be elastically movable in a direction substantially perpendicular to the axis by three-dimensional elastic deformation of the leaf springs 58 and 59, which will be described later. Thus, even if there is a misalignment between the axis of the bobbin case 2 held by the bobbin case gripping means 50 and a winding shaft (described later) of the lower thread winding device 162, the misalignment is caused by the leaf spring 58, 59 is eliminated by the three-dimensional elastic deformation, so that the bobbin case 2 can be securely mounted and removed from the winding shaft.
[0023]
Therefore, the positioning of the winding shaft of the bobbin winding device 162 and the bobbin case gripping means 50 may be roughly determined, that is, a slight "displacement" can be tolerated, and the assembly time required for this positioning can be reduced. It has become. The alignment guide mechanism for centering will be described later.
[0024]
The gripping mechanism itself is described in, for example, an automatic lower thread feeder of Japanese Patent Application Laid-Open No. Hei 5-192476 and an automatic lower thread feeder of a sewing machine described in Japanese Patent Application No. 5-121960 previously filed by the present applicant. As well as a pair of electromagnet suction heads, such as those using a lever claw described in a lower thread automatic feeding device of a sewing machine of Japanese Patent Application No. 5-116363 previously filed by the present applicant. What is essential is that the bobbin case 2 can be attached to and detached from the facing member (for example, the shuttle 1) as necessary.
[0025]
Returning to FIGS. 1 to 6 again, a rotating gear 13 is fixed to the outer periphery of the transport block 12, and the rotating gear 13 extends along the shuttle shaft 1a as shown in FIG. And the drive gear 19 having a long shape is meshed. 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 projecting toward the other end of the transport shaft, and the other end is fixed to the motor fixing plate 21. It is in a state of being directly connected to the output shaft of the rotating motor 20.
[0026]
Accordingly, when the rotation motor 20 rotates, the rotation arm 70 as rotation means including the transport block 12, the transport plates 10, and the holding units 11, 11 rotates via the drive gear 19 and the rotation gear 13. It is supposed to. In this embodiment, the rotating operation of the rotating arm 70 is performed when the rotating arm 70 is at the retracted position (see FIGS. 3 to 5). Although the transport shaft 4 is cantilevered, it is guided by the drive gear 19, so that its support strength is sufficient.
[0027]
For example, a stop ring (not shown) is fixed to the fixed end of the transport shaft 4 from the rotary gear 13 on the outer circumference of the transport block 12. A linear collar 14 is rotatably supported therebetween.
[0028]
As shown in FIGS. 2 to 4, one end of a rack 16 movably supported in parallel with the shuttle shaft 1a is fixed to the linear motion collar 14, and a pinion is attached to the other end of the rack 16. 17 are engaged. The pinion 17 is fixed to an output shaft of a moving motor 18 attached to the base plate 3.
[0029]
Therefore, when the moving motor 18 is driven, the translation collar 14 and the rotating arm 70 move along the rack 16 via the pinion 17 along the axial direction of the transport shaft 4. That is, the rotating arm 70 can rotate with respect to the transport shaft 4 and can slide along the transport shaft 4.
[0030]
A sensor fixing plate 33 is mounted on the open end side of the transport shaft 4, and a rotation sensor 31 including a light emitting element 31 a and a light receiving element 31 b is mounted on the sensor fixing plate 33. As shown in FIGS. 2 and 3, a sensor plate 32 is fixed to the rotating arm 70. When the rotating arm 70 rotates, the sensor plate 32 separates the light emitting element 31a and the light receiving element 31b. The positions of the rotation sensor 31, the sensor fixing plate 33, and the sensor plate 32 are adjusted so that they can pass between them.
[0031]
As shown in FIGS. 2 and 4, a linear motion sensor 41 having the same structure as the rotation sensor 31 is attached to the base plate 3. Further, a sensor plate 15 is fixed to the rack 16, and the sensor plate 15 can pass between the light emitting element 41 a and the light receiving element 41 b of the linear motion sensor 41 when the rotating arm 70 is moved directly. Thus, the position adjustment of the linear motion sensor 41 and the sensor plate 15 is performed.
[0032]
Further, a dummy shaft 6 as a bobbin case holding means is fixed to a position D directly below the shuttle 1 at a position opposite to the rotation locus of the bobbin case gripping means on the base plate 3, as shown in FIG. ing. As shown in FIG. 6, the dummy shaft 6 has the same structure as the intermediate hook shaft 5. When the bobbin case 2 containing the bobbin is pushed in, the dummy shaft 6 can hold the bobbin case 2. Has become. The pushed-in bobbin locking claw 2d of the bobbin case 2 is configured to engage with the locking groove of the detent member 5aa protruding near the dummy shaft 6, as shown in FIG. ing. That is, the bobbin case 2 is positioned and held at a predetermined position.
[0033]
The lower thread winding position C and the remaining thread removing position B are rotated when the sewing machine bed 101 is raised from the upright plane along the range V below the conveying shaft 4 and the coaxial line as shown in FIG. It is a range W on the fulcrum 103 side, and is disposed at a position facing the rotation locus of the bobbin case gripping means. Further, the remaining yarn removing position B is disposed below the lower yarn winding position C. The position of the remaining yarn removing position B in the direction of the transport axis (the direction perpendicular to the paper surface in FIG. 1) is at the retreat position of the bobbin case gripping means, and the position of the lower thread winding position C in the direction of the transport axis is the bobbin case gripping means. At a position slightly advanced from the retreat position (a position advanced toward the paper surface in FIG. 1).
[0034]
At the residual yarn removing position B, a residual yarn removing device 161 is provided. The residual yarn removing device 161 has, for example, a clamping member capable of clamping or releasing the tip of a yarn wound on a bobbin, and is rotated around a single axis by, for example, a motor or the like to be clamped by the clamping member. The bobbin case 2 is automatically wound up. The point is that the bobbin case 2 is delivered to a state in which the bobbin case 2 is held by the bobbin case holding means or to a means capable of holding the bobbin case. In a state where the bobbin case 2 is held, the bobbin is rotated by the yarn pulling-out operation of the pulling-out means for pulling out the yarn that is wound around the bobbin and is drawn out (hangs) from the bobbin case, so that the yarn wound around the bobbin is pulled out. Any one may be used as long as such is the case. For example, Japanese Patent Application No. 5-203610 filed earlier by the present applicant and Starting with residual yarn removing device bobbin Gantaira 6-40351 Pat, it can be adopted as appropriate.
[0035]
The residual yarn removing device is configured as described above, and is basically configured to draw out a bobbin thread wound around the bobbin and hanging from the bobbin case. Therefore, a main part thereof is disposed below the residual yarn removing position B. ing.
[0036]
A lower thread winding device 162 is disposed at the lower thread winding position C. As the bobbin winding device 162, a bobbin bobbin that can automatically wind a bobbin by, for example, driving a motor or the like, and that can thereafter hook the bobbin case 2 and cut the bobbin case is used. Hereinafter, the lower thread winding device 162 will be described.
[0037]
The lower thread winding device 162 generally includes a bobbin driving mechanism E, a guide mechanism G, and a thread tension applying mechanism F. The thread tension applying means F is for applying a predetermined tension (resistance) to the lower thread drawn from the thread winding as a lower thread supply source, and the guide mechanism G is provided with a lower thread end from the thread tension applying means F. The part is guided into the bobbin case 2 through the opening 2A of the bobbin case 2 shown in FIG. 10, and the bobbin driving mechanism E rotates the bobbin 7 in the bobbin case 2.
[0038]
The bobbin driving mechanism E will be described. First, in FIGS. 11 and 12, reference numeral 80 denotes a winding shaft, which is rotatably supported on a base (not shown). At one end of the winding shaft 80, a disk-shaped clutch provided with a pair of clutch pins 80a, 80a capable of being disengaged from a plurality of existing holes (see reference numeral 7a in FIG. 10) formed in the bobbin 7. A plate 80b is fixed, and a pulley 80d is fixed to the other end of the winding shaft 80. On the other hand, a bobbin drive motor M2 is also fixed to the base side, and a belt 81 is stretched between a pulley 82 fixed to an output shaft of the bobbin drive motor M2 and the pulley 80b.
[0039]
That is, the bobbin case 2 which has reached the bobbin winding position C by the rotation of the rotating arm 70 is positioned so as to face the bobbin driving mechanism E, as shown in FIG. When the hole 7a of the bobbin 7 is inserted into and engaged with the clutch pin 80a by the forward operation of the bobbin 70, the bobbin drive motor M2 is driven to rotate, whereby the winding shaft 80 rotates and the clutch pin 80a The bobbin 7 is driven to rotate via the clutch plate 80b. It should be noted that the clutch mechanism is not limited to the configuration that engages with the hole as described above, and may have another configuration.
[0040]
On the other hand, the bobbin case guide pin 83 protrudes from the center position of the clutch plate 80b by a predetermined amount along the axis of the winding shaft 80. The bobbin case guide pin 83 guides the bobbin case 2 to an accurate position, has a shaft diameter that can be inserted into the center hole 2g of the bobbin case 2, and has a bobbin case guide pin 83. Is formed in a tapered pointed shape for alignment. As shown in FIG. 13, the bobbin case guide pin 83 is connected to the tip of the winding shaft 80 so as to be freely rotatable, and the rotational force from the winding shaft 80 is transmitted. It is provided as a non-rotating member that is not provided.
[0041]
Next, the guide mechanism G for guiding the bobbin thread from the bobbin to the opening 2A of the bobbin case 2 will be described. In FIGS. 14, 15, and 16, reference numeral 65 denotes a yarn suction device. As shown in FIG. 16, the yarn suction device 65 has a through hole 65c as a straight path. . One opening of the through hole 65c is a suction port 65a for sucking a lower thread, and the other opening is connected to an air tube 67 as a guide path. The air tube 67 is bent in a U-shape at an intermediate portion thereof, and an air nozzle 67a is provided at the tip.
[0042]
An air passage 65b is formed in the straight through hole 65c for sending air obliquely connected from the outside toward the air tube 67 side. Is connected to one end of an air tube 66 via a joint 66a, and the other end of the air tube 66 is connected to a solenoid valve of an air source (not shown). Further, a thread mounting switch (not shown) for turning on and off the solenoid valve is provided.
[0043]
The yarn suction device 65 is mounted on a flat nozzle bracket 69d. The right end in the drawing of the nozzle bracket 69d is fixed to the lower end of the rotary shaft 69c, and the upper end of the rotary shaft 69c is rotatably supported by the base bracket 501. An idler gear 69b is fixed to the rotating shaft 69c, and a motor gear 69a meshes with the idler gear 69b. The motor gear 69a is fixed to an output shaft of a stepping motor 69 as an air nozzle retreat motor mounted on the base bracket 501.
[0044]
Therefore, when the stepping motor 69 is driven, the nozzle bracket 69d, the yarn suction device 65, and the air tube 67 rotate around the rotation shaft 69c as a rotation fulcrum. When the stepping motor 69 is driven, the air nozzle 67a is positioned at a position (working position) opposed to the opening 2A of the bobbin case 2 shown by a dotted line in FIG. 14 when the lower thread is entangled with the bobbin shaft 7a. Then, at the time of thread hooking, bobbin thread cutting, and bobbin thread winding, it is located at the retracted position shown by the solid line in FIG.
[0045]
When the operator inserts the bobbin thread into the suction port 65a, the air nozzle 67a is in the retracted position, and at this time, the respective arrangement settings are made so that the suction port 65a is substantially directed in the direction facing the surface direction NN. ing. The lower thread guide direction (air blowing direction) at the tip of the air nozzle 67a stopped at the above-mentioned working position is on the lower thread winding side of the bobbin shaft. The lower thread guide direction at the tip of the air nozzle 67a is preferably a direction intersecting the outer periphery of the bobbin shaft on the side where the lower thread is wound on the bobbin shaft, and particularly preferably a direction in contact with the outer periphery of the bobbin shaft.
[0046]
When the solenoid valve 68 is turned on, air is supplied from an air source, and the air is blown out from an air nozzle 67 a through an air tube 66, a yarn suction device 65, and an air tube 67, and the yarn suction device is moved through a yarn guide 651. The end of the lower thread inserted from the suction port 65a of 65 is drawn out from the air nozzle 67a.
[0047]
The bobbin thread length (LL) derived from the air nozzle 67a is a length necessary to entangle the bobbin shaft with the derived bobbin end. The required length is (1) {(length from the air nozzle at the working position to the outer periphery of the bobbin shaft) + [length of one bobbin shaft circumference x (1.1 to 2.0)]}. (2) {(the length from the air nozzle at the working position to the outer periphery of the bobbin shaft) + [the length of one bobbin shaft circumference x (1.25 to 1.8)]} More preferably, it is within the range.
[0048]
If the length is longer than the range of (1), the lower thread end to be led out becomes difficult to enter from the opening 2A of the bobbin case 2, or even if it enters, the bobbin shaft 7a rotates one or more times to form a knot. There is a fear that the bobbin shaft 7a may be tied up. If the bobbin shaft 7a is shorter than the range of (1) or (2), the lower thread end may not be entangled with the bobbin shaft 7a.
[0049]
In this embodiment, the required length is set to 55 mm. That is, the distance H between the tip of the air nozzle 67a and the opening 2A of the bobbin case 2 is 7 mm, the length 7 mm in contact with the outer periphery of the bobbin shaft from the bobbin case opening 2A, and (bobbin shaft circumference 25 mm × 1.64) = 31 mm Asked from.
[0050]
The air nozzle 67a can be moved between the working position and the retreat position by the stepping motor 69 as described above, and when the air nozzle 67a is located at the retreat position, the lower thread cutting point during the cutting and the air nozzle 67a The bobbin case 2, bobbin thread cutting point, and Each arrangement such as the retracted position of the air nozzle 67a is determined. Since the retreat position of the air nozzle 67a is set by the stepping motor 69 as described above, the position adjustment is extremely easy.
[0051]
By the way, in this embodiment, the bobbin case gripping means moves the bobbin case to and from the bobbin case attaching / detaching positions (position of the shuttle shaft; the position of the dummy shaft) A and D by the moving motor 18 (FIGS. 2 to 3). (See FIG. 6). That is, when the bobbin case gripping means moves to the retracted position, the sensor plate 15 shields between the light emitting element 41a and the light receiving element 41b of the linear motion sensor 41. Movement to is detected. Then, the origin position is searched for at the evacuation position. That is, if the bobbin case gripping means is rotated at the retracted position, and a position where the sensor plate 32 shields between the light emitting element 31a and the light receiving element 31b is set as, for example, the origin position, the bobbin case gripping means is rotated to this position. Then, it will return to the origin position. When a pulse motor is used as the rotation motor 20, for example, the number of pulses of the pulse motor is counted, and the bobbin case gripping means is moved to the shuttle position A, the bobbin winding position C, and the remaining yarn. The rotation can be controlled to the removal position B and the dummy position D.
[0052]
Next, the operation of the lower thread automatic feeder configured as described above will be described below. First, in order for one bobbin case gripping means to grip the bobbin case accommodating the bobbin wound with the bobbin thread, the bobbin case accommodating the bobbin wound with the bobbin thread is mounted on the inner hook shaft 5 in the same manner as in mounting the bobbin case. Then, the bobbin case is attached to the dummy shaft 6 by pushing the palm into the dummy shaft 6 without returning the palm. Here, for convenience of explanation, the bobbin case is denoted by 2X, and the bobbin case described below is denoted by 2Y.
[0053]
Next, when the power switch is turned on, the turning arm 70 is returned to the home position, and when the start switch is turned on, the turning arm 70 is turned so that one bobbin case gripping means faces the dummy position D. Then, the rotating arm 70 is advanced, and the bobbin case 2X containing the bobbin around which the bobbin thread has been wound and held by the dummy shaft 6 is held by one bobbin case holding means. At this time, the other bobbin case gripping means heads toward the shuttle without interfering with any obstacle.
[0054]
Here, when the dummy shaft 6 is provided at a position opposite to the residual yarn removing position B or the lower yarn winding position C with respect to the transport shaft 4, the residual yarn removing position B is set as described above. Since the position in the transport axis direction is at the retracted position of the bobbin case gripping means, and the position of the lower thread winding position C in the transport axis direction is at the position where the bobbin case gripping means is slightly advanced from the retracted position, When the bobbin case gripping means is directed toward the dummy shaft 6, the other bobbin case gripping means collides with the residual yarn removing device 161 and the lower yarn winding device 162. However, in the present embodiment, there is no problem because the dummy shaft 6 is arranged at the position opposing the rotation locus of the bobbin case gripping unit and directly below the shuttle 1, as described above.
[0055]
Then, the rotating arm 70 is retracted and rotated, so that the one bobbin case gripping means gripping the bobbin case 2X faces the shuttle 1 and moves forward, and the bobbin case 2X containing the bobbin on which the bobbin thread has been wound is accommodated. To the pot. At this time, the other bobbin case gripping means moves toward the dummy shaft 6 without interfering with any obstacle. Then, the rotating arm 70 is retracted. At this time, the operator inserts his / her hand again from the rotating arm side (opposite side) in the same manner as described above, and mounts the bobbin case 2Y accommodating the bobbin on which the bobbin thread has been wound on the dummy shaft 6.
[0056]
Next, when the sewing is started, the bobbin case 2Y containing the bobbin wound with the bobbin thread held by the dummy shaft 6 is gripped by one of the bobbin case gripping means during the sewing by the same operation as described above. At the same time, the rotating arm 70 is retracted.
[0057]
Then, when a bobbin replacement command is issued, for example, because the remaining thread of the bobbin in the shuttle has decreased, the sewing operation of the sewing machine is prohibited, the rotating arm 70 is rotated, and the bobbin case is gripped. The bobbin case gripping means not facing the shuttle 1 is moved forward while the bobbin case 2X accommodating the bobbin with less remaining yarn is taken out of the shuttle, and the rotary arm 70 is retracted.
[0058]
Next, the rotating arm 70 is rotated, and the bobbin case 2Y accommodating the bobbin on which the bobbin thread has been wound is opposed to the shuttle 1 and advanced, and the bobbin case 2Y accommodating the bobbin on which the bobbin thread has been wound is mounted in the shuttle. Then, the rotating arm 70 is moved backward.
[0059]
When the sewing is started, the rotating arm 70 is rotated during the sewing, and the bobbin case 2X accommodating the bobbin in which the remaining thread is reduced is moved to the remaining thread removing position B. Then, the remaining yarn removing device 161 removes the remaining yarn of the bobbin accommodated in the bobbin case 2X, and makes the bobbin an empty bobbin without a yarn.
[0060]
Next, the rotating arm 70 is rotated so that the bobbin case 2X accommodating the empty bobbin is opposed to the lower thread winding device 162, and the rotating arm 70 is moved forward. Is wound. The operation of the lower thread winding device 162 will be described below.
[0061]
First, the thread end of the bobbin thread from the bobbin winding and bobbin thread tension adjusting mechanism is inserted into the suction port 65a of the thread suction device 65 via the thread guide 651, and is slightly pushed in. Here, as described above, since the suction port 65a is disposed so as to substantially face in the direction opposite to the surface direction NN, the operator can straighten his / her hand without turning his palm toward the surface direction NN. If it is inserted, the lower thread end can be inserted into the suction port 65a.
[0062]
Next, the solenoid valve is temporarily turned on to flow air from an air source into the air tube 66, the yarn suction device 65a, and the air tube 67, and the lower thread 150 inserted and pushed into the suction port 65a is caused to flow by the air nozzle. The yarn is guided to the air nozzle 67a and the yarn end is exposed from the air nozzle 67a and led out. At this time, since the through-hole 65c constituting the lower thread supply path of the thread suction device 65 is a straight path as described above (the path is not bent), it is inserted and pushed into the suction port 65a. The lower thread 150 that has been moved toward the air nozzle 67a with a reduced thread resistance as much as possible.
[0063]
As described above, the lower thread lead-out length LL from the air nozzle 67a is a length necessary to entangle the lower thread end with the bobbin shaft, and in this embodiment, is about 35 mm. is there. When the bobbin thread 150 inserted and pushed into the suction port 65a is conveyed from the thread aspirator 65 by air to be exposed and drawn out from the air nozzle 67a, an operator needs to manually remove the bobbin thread from the bobbin by hand. If a large amount is previously pulled and loosened or sent out manually, the lower thread is conveyed more favorably.
[0064]
The solenoid valve control for deriving the lower thread end inserted and pushed into the suction port 65a from the air nozzle 67a to the predetermined amount LL is performed by turning on the solenoid valve for a predetermined time by, for example, a timer. . The ON time of the solenoid valve is obtained by, for example, an experiment. Further, the worker may visually confirm the derivation of the lower thread end portion, control the ON / OFF of the solenoid valve, and finely adjust the derivation length LL from the air nozzle 67a.
[0065]
When the bobbin case 2 reaches the bobbin winding position C by the rotation of the rotary arm 70, the center axis 2h of the bobbin case 2 is connected to the winding shaft 80 of the bobbin driving mechanism E, as shown in FIG. Is slightly shifted from the shaft 80c. However, when the bobbin case 2 approaches the bobbin driving mechanism E due to the forward movement of the rotating arm 70, the tapered pointed portion of the bobbin case guide pin 83 projecting from the bobbin driving mechanism E side causes the bobbin case 2 to rotate. The bobbin case guide pin 83 enters the center hole 2g, and the guide force of the bobbin case guide pin 83 acts on the bobbin case 2.
[0066]
On the other hand, as described above, in the bobbin case gripping means 50 according to the present embodiment, the bobbin case 2 can be elastically moved in a direction substantially orthogonal to the central axis 2h by the three-dimensional elastic deformation of the leaf springs 58, 59. When the guide force of the bobbin case guide pin 83 is generated, the center axis 2h of the bobbin case 2 held by the bobbin case gripping means 50 is wound by the bobbin winding device 162 in accordance with the guide force. The centering movement is performed so as to coincide with the axis 80c of the take-up shaft 80. As a result, the hole 7a of the bobbin 7 is inserted and connected to the clutch pin 80a while the bobbin case 2 is accurately aligned with the bobbin driving mechanism E. At this time, the bobbin drive motor M2 is temporarily driven to position the clutch pin 80a and the bobbin 7 in the circumferential direction.
[0067]
Further, since the bobbin case guide pin 83 in this embodiment is provided as a non-rotating member to which the rotational force from the bobbin driving mechanism E is not transmitted as shown in FIG. Relative rotation is avoided, and wear and the like of both are prevented.
[0068]
Further, at this time, as shown in FIG. 17, if the bobbin case guide pin 83 is provided with a bobbin guide portion 83a for guiding the bobbin 7 to the lower thread winding position, the bobbin 7 itself can be aligned. As a result, more accurate positioning can be performed. That is, the bobbin guide portion 83a in FIG. 17 is formed of an annular step formed integrally with the clutch plate 80b, and is arranged so as to surround the outer peripheral surface of the bobbin case guide pin 83 with a slight gap. The outer peripheral surface of the bobbin guide portion 83a is formed as a tapered guide surface, and the tapered guide surface is configured to be inserted into the center hole of the bobbin 7 while being centered.
[0069]
According to such an embodiment, after the bobbin case 2 is accurately aligned with the bobbin driving mechanism E, the bobbin 7 itself is aligned with the bobbin driving mechanism E by the bobbin guide portion 83a. The positioning can be performed with higher accuracy, and the wear of the bobbin case guide portion 83 and the bobbin case 2 can be more reliably prevented.
[0070]
When the bobbin 7 is connected to the bobbin driving mechanism E in this manner, first, the bobbin driving motor M2 is driven at a low speed to rotate the bobbin at a low speed. Next, a forward signal is given to the stepping motor 69, and the air nozzle 67a is directed to the working position near the opening 2A of the bobbin case 2, and the electromagnetic valve is turned on to turn on the air tube 66, the yarn suction device 65, and the air tube 67. Flow air from the air source.
[0071]
Then, when the entanglement of the bobbin thread 150 with the bobbin shaft is detected in this way, the solenoid valve is turned off, the air from the air source is stopped, and a retreat signal is given to the stepping motor 69 with a slight time lag, so that the air is supplied. The nozzle 67a is retracted to the retract position. Then, the actual bobbin winding amount is compared with the set bobbin winding amount, and when both bobbin yarn amounts match, a drive stop signal is sent to the driver of the bobbin driving motor M2, and the bobbin driving motor M2 is stopped. That is, the set lower thread winding amount input from the lower thread winding amount setting means 61A is wound around the bobbin shaft.
[0072]
Although the invention made by the inventor has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and it can be said that various modifications can be made without departing from the gist of the invention. Needless to say, for example, the bobbin driving mechanism and the bobbin case gripping means Bobbin case gripped by As long as at least one side is provided so as to be movable in a direction substantially perpendicular to the winding axis, unlike the above-described embodiment, the rotation is transmitted using, for example, an Oldham coupling or a universal coupling. The drive mechanism side may be provided movably.
[0073]
【The invention's effect】
As described above, the bobbin winding device according to claim 1 or 2 is provided with the bobbin case guide member on the bobbin drive mechanism side, and the bobbin case held by the bobbin case gripping means is guided by the bobbin case guide member. The bobbin drive mechanism is accurately brought closer to the bobbin drive mechanism side, and the winding axis of the bobbin drive mechanism and the axis of the bobbin case are aligned to accurately align the two. The lower thread can be wound, and the reliability of the lower thread winding device can be improved.
[0074]
According to a third aspect of the present invention, in the bobbin winding device according to the first or second aspect, the bobbin case guide member is provided as a non-rotating member to which the rotational force from the bobbin driving mechanism is not transmitted. The case guide member and the bobbin case are configured to avoid relative rotation to prevent wear and the like of both cases. Tamo Therefore, the reliability of the lower thread winding device can be further improved.
[0075]
Further, the bobbin winding device according to claim 4 has, in addition to the configuration of the device according to claim 1, 2 or 3, a bobbin guide member for guiding the bobbin to the bobbin winding position on the bobbin case guide member. After accurately aligning the bobbin case with the bobbin drive mechanism, the bobbin itself is further aligned with the bobbin drive mechanism side by the bobbin guide member, thereby enabling more accurate positioning and bobbin case guide member. Since the wear of the bobbin case and the like can be more reliably prevented, the reliability of the lower thread winding device can be further improved.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an automatic lower thread supply device to which a lower thread winding device according to the present invention is applied, viewed from a direction facing a surface portion.
FIG. 2 is a view of the bobbin changing device used in the bobbin automatic supply device shown in FIG. 1 as viewed from a direction facing a surface portion.
FIG. 3 is a plan view of the bobbin exchanging device shown in FIG.
FIG. 4 is a rear view of the bobbin changing device shown in FIG. 1;
FIG. 5 is a front view of the bobbin changing device shown in FIG. 1;
FIG. 6 is a schematic front view for explaining a dummy position and a dummy axis.
FIG. 7 is a perspective view showing an example of a bobbin case gripping means.
8 is a view of the bobbin case gripping means of FIG. 7 as viewed from the X direction.
FIG. 9 is an operation explanatory view showing an operation of the bobbin case gripping means of FIG. 7;
FIG. 10 is an external perspective view showing the structure of a bobbin case.
FIG. 11 is an external perspective view illustrating a main structure of a lower thread winding device according to an embodiment of the present invention.
FIG. 12 is an explanatory side view showing a face-to-face state of the bobbin winding device and the bobbin exchanging device shown in FIG. 11;
FIG. 13 is an enlarged vertical cross-sectional view illustrating a tip end portion of a bobbin case guide pin in the lower thread winding device shown in FIG. 11;
FIG. 14 is a plan view showing an example of a guide means in the lower thread winding device.
FIG. 15 is a view as seen from the direction facing the surface of the guide means shown in FIG. 14;
FIG. 16 is a cross-sectional view of the lower thread suction device in the guide means shown in FIG.
FIG. 17 is an explanatory side view showing a main structure of a lower thread winding device according to another embodiment of the present invention.
[Explanation of symbols]
2,2X, 2Y bobbin case
2A Bobbin case opening
7 bobbins
7a Bobbin hole
50 bobbin case gripping means
50a Clutch pin
50b Clutch plate
65 aspirator
65a suction port
65b air passage
65c straight path
70 Rotating arm
162 Lower thread winding device
E bobbin drive mechanism
80 winding shaft
80a Clutch pin
83 bobbin case guide pin
83a Bobbin guide
150 lower thread

Claims (4)

A bobbin thread is wound around the bobbin in the bobbin case held by the bobbin case gripping means,
A bobbin driving mechanism for applying a rotational driving force to the bobbin by engaging a winding shaft with the bobbin in the bobbin case;
A bobbin case guide member for centering and guiding the bobbin case so that the center axis of the bobbin case coincides with the winding shaft of the bobbin driving mechanism.
Be substantially perpendicular to the winding shaft according to the guiding action force generated between the said bobbin driving mechanism, at least one side is between the bobbin case holding hand stage gripped bobbin case, and the bobbin case guide member and the bobbin case bobbin thread winding device, characterized in that it is movable in the direction that. The bobbin case guide member according to claim 1, wherein a tip end portion of a pin member formed so as to protrude so as to contact a part of the bobbin case is formed in a pointed shape. apparatus. 3. The bobbin winding device according to claim 1, wherein the bobbin case guide member is provided as a non-rotating member to which a rotational force from the bobbin driving mechanism is not transmitted. 4. A bobbin winding device according to claim 1, further comprising a bobbin guide member for guiding the bobbin to a bobbin winding position.

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