JP3521992B2 - Automatic lower thread feeder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic bobbin thread feeder for a sewing machine.

[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 bobbin thread is consumed, the sewing machine operation is temporarily stopped, the bobbin case is removed from the hook, the bobbin thread is wound around the bobbin, and the bobbin on which this bobbin thread is newly wound is placed in the bobbin case. A series of operations for accommodating and mounting the bobbin case in the shuttle are performed manually.

[0003]

However, the manual operation of winding the bobbin around the bobbin and the replacement operation of the bobbin case are extremely inefficient and cause a decrease in productivity.

Therefore, the present applicant has attempted to solve the above problems in the bobbin thread feeder of the sewing machine described in Japanese Patent Application Laid-Open No. 5-192476, which has been previously filed. Japanese Patent Application No. 5-203612 proposes a device that can automatically remove residual yarn.

9 and 10 show the basic structure of the above apparatus. This device is arranged in a space where the bottom of the sewing machine bed 101 is an oil reservoir, and the bobbin case attaching / detaching position A, the residual thread removing position G, and the bobbin thread winding position H are arranged around the guide shaft 50. They are arranged at 120 ° intervals. The shuttle 1 is provided at the bobbin case attaching / detaching position A, and the residual thread removing device 61 for removing the residual thread of the bobbin 7 is provided at the residual thread removing position G.
However, at the lower thread winding position H, a lower thread winding device 62 that winds the lower thread around the bobbin 7 and hooks the bobbin case and cuts the lower thread is provided.

Both ends of the guide shaft 50 are rotatably supported by respective upright portions (not shown) provided upright on the main base, and the guide shaft 50 extends along the guide shaft 50. A rotating arm 51 that is slidable and rotatable with the guide shaft 50 is supported. The forward / backward movement of the rotary arm 51 along the guide shaft 50 is performed by a forward / backward lever 52 driven by, for example, an air cylinder, and the forward or reverse rotation operation is performed in 60 ° units by a rotation drive device (not shown). . Rotating arm 51
A bobbin case 2 containing a bobbin 7 near each end of the
A bobbin case gripping means capable of holding or releasing is provided, and the bobbin case gripping means and the pivot arm 51 constitute a bobbin changing device 60. It should be noted that reference numeral 5 in FIG.
Indicates the lower axis, respectively.

Then, by appropriately rotating, advancing or retracting the rotating arm 51, the bobbin case in the shuttle is
The bobbin case is grasped by the bobbin case grasping means and pulled out from the inside of the shuttle, and the bobbin case accommodating the bobbin wound bobbin can be grasped by the bobbin case grasping means and mounted in the shuttle. Further, by positioning the bobbin case at the residual thread removing position G, the residual thread of the bobbin 7 can be removed. By positioning the bobbin case at the lower thread winding position H, the lower thread is wound around the bobbin. The bobbin case can be hooked and the bobbin thread can be cut.

As described above, in the above apparatus, the bobbin 7 is wound around the bobbin thread (including hooking the bobbin case and cutting the bobbin thread), the remaining thread removing operation, and the bobbin case 2.
All replacement work is done automatically,
Work efficiency and productivity are improved.

By the way, the bobbin changing device 60, the residual yarn removing device 61, and the lower yarn winding device 62 are the same as the sewing machine bed 10.
When the sewing machine head is to be lifted, the devices 60, 61, 6 are provided with the rotary shaft 103 of the sewing machine bed 101 shown in FIG. 10 as a fulcrum.
2 is also rotated together.

However, as described above, in this apparatus, the bobbin case attaching / detaching position A, the residual thread removing position G and the bobbin thread winding position H are arranged at equal intervals of 120 ° around the guide shaft 50. Since the bobbin thread winding device 62 is arranged in the vicinity of the rotation locus X on the outer peripheral side when the sewing machine head is raised, the bobbin thread winding device 62 is rotated when the sewing machine head is raised. There is a fear of interference (contact) with the side sewing machine table 102.

Therefore, it is necessary to make the components constituting the lower thread winding device 62 small to avoid this interference, but there is a problem in that it is expensive to make the components small and sophisticated. . Further, when the bobbin winding device 62 is configured by reducing the parts in this way, there is a problem that the assembly work, the wiring work, the piping work, and the like become complicated and the maintainability deteriorates.

Further, in the above apparatus, since the bobbin case attaching / detaching position A, the residual yarn removing position G and the bobbin thread winding position H are arranged at equal intervals of 120 ° around the guide shaft 50,
Since the devices are separated from each other, the wiring, the piping, and the like are scattered, which is disadvantageous in terms of space, and the bobbin case gripping means (rotating arm 51) can be installed in the bobbin case attaching / detaching position A, the residual thread removing position G, and the bobbin winding. In order to move to all the positions of the turning position H, it is necessary to rotate 360 °, so that there is also a problem that a lot of useless movement is required for the turning operation.

Therefore, according to the present invention, interference of the residual thread removing device and the bobbin thread winding device with the sewing machine table and the oil pan when the sewing machine head is raised can be prevented without reducing the size of the components, and the cost of the device can be reduced. In addition, the assembling work and the work of wiring, piping, etc. can be simplified and the maintainability can be improved, and the wiring, piping, etc. of the device can be concentrated, which is advantageous in terms of space and waste of the rotating operation of the bobbin case gripping means. An object of the present invention is to provide a reduced bobbin thread automatic feeder.

[0014]

To achieve the above object, an automatic bobbin thread feeder according to a first aspect of the present invention has a bobbin case grasping means capable of grasping or releasing a bobbin case accommodating a bobbin. Rotate around a rotation axis parallel to the shuttle shaft of the sewing machine
Rotating means, and moving means for moving the rotating means to the rotation axis direction of the bobbin exchanging device provided with,
Medium and bobbin thread winding device, the residual strand removing device for removing residual yarn bobbins, was immediately <br/> Bei the bottom of the bed, the rotation axis of the rotating means for winding the lower thread to the bobbin A bobbin attachment / detachment position for attaching / detaching the bobbin to / from the hook at a position facing the rotational trajectory of the bobbin case gripping means in the direction of the rotation axis ,
Residual thread removal position for removing the residual yarn of the bobbin in the residual thread removing device, Te lower thread automatic feeder odor placing the bobbin thread winding position for winding the bobbin thread in the bobbin thread winding device, the residual thread removal position and The bobbin winding position is the rotation axis of the rotating means.
Than upright plane containing the is characterized in that arranged in the range of the pivot point side when causing the sewing machine bed.

In order to achieve the above object, an automatic bobbin thread feeder according to a second aspect of the present invention is, in addition to the first aspect, a bobbin case holding means capable of holding a bobbin case containing a bobbin.
It is characterized in that the bobbin case gripping means is arranged directly below the shuttle at a position opposite to the rotation trajectory of the holding means.

According to another aspect of the present invention, there is provided a bobbin case in which a bobbin case containing a bobbin is held.
Use a bobbin case gripper that can be held or released by
Bobbin changing device that moves along the path and bobbin thread
The bobbin thread winding device that winds the
A thread removing device,
The bobbin residual thread in the residual thread removing device is located on the moving path.
To remove the residual thread and the lower thread in the lower thread winding device.
The bobbin thread automatic feeding device in which the bobbin thread winding position for winding is arranged
In addition, the residual thread removing position is located below the lower thread winding position.

[0017]

According to the automatic bobbin thread feeder of the first aspect, the residual thread removing position and the bobbin thread winding position are positions opposite to the rotation locus of the bobbin case gripping means, and together with the bobbin case gripping means. Includes the axis of rotation of the rotating rotating means.
When causing the bed than the no upright plane of the pivot point side
When arranged in the range , the residual thread removing device and the bobbin thread winding device move inward from the rotation track on the outer peripheral side when the sewing machine head is raised, and the devices approach each other.

According to the bobbin thread automatic feeder of the second aspect, when the bobbin case gripping means moves in the axial direction to the bobbin case attaching / detaching position (hook position), the axis of the bobbin case gripping means in the rotating means. Since the portion on the opposite side with respect to the center also moves in the axial direction in the same manner, the escape path that does not interfere with the opposite side portion is required in the movement path of the opposite side portion. Therefore, when the bobbin case holding means is arranged directly below the shuttle at a position opposite to the rotation trajectory of the bobbin case holding means, the bobbin case holding means moves in the axial direction and moves to the bobbin case attaching / detaching position (hook position). In both the case and the case of moving to the bobbin case holding means, the opposite side portion does not interfere with the facing member.

According to the automatic bobbin thread feeder of the third aspect, the residual thread removing device generally draws the thread dripping from the thread lead-out portion of the bobbin case and rotates the bobbin to rotate the bobbin residual thread. Since the configuration for removing the residual yarn is adopted, the main part of the residual yarn removing device is arranged below the residual yarn removing position. Therefore, when the residual thread removing position is located below the lower thread winding position, the space below the residual thread removing position is made empty. Further, since the residual thread removing position is below the bobbin thread winding position, the residual thread removed by the residual thread removing device is quickly discharged without being entangled with another device, for example, the bobbin winding device.

[0020]

Embodiments of the present invention will now be described in detail with reference to the drawings. As shown in FIG. 1, the automatic bobbin thread feeder of this embodiment includes a bobbin winding device 162 and a residual yarn removing device 1.
61, the lower thread winding position C of these lower thread winding devices 162,
A bobbin exchanging device 160 capable of moving the bobbin case 2 to 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 case attaching / detaching position D of a dummy shaft (bobbin case holding means) 6. , And the automatic bobbin thread feeder is provided below the sewing machine bed 101. First, the bobbin exchanging device 160 will be described below with reference to FIGS. 2 to 6.

In FIGS. 2 to 6, reference numeral 1 stands for a shuttle in which the bobbin case 2 is mounted, 1a stands for a shuttle shaft, and 3 stands for a main base mounted on the main body of the sewing machine.
3A and 3B respectively show a base plate serving as a support body disposed immediately below the base plate 3, and a base end 4a of a transfer shaft 4 having an axis parallel to the shuttle shaft 1a is fixed to the base plate 3. The shaft 4 is cantilevered by the base plate 3.

On the tip 4b side (opposite to the base plate side) of the transfer shaft 4, a transfer block 12 is formed in which 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. (See FIG. 2) is rotatably and slidably supported on the transport shaft 4.

To each cut surface of the transport block 12, one plate-like portion of the L-shaped transport plates 10, 10 constituting the L-shape is fixed, and the other of the L-shaped transport plates constitutes the L-shape. As shown in FIG. 2, 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 and 11 bent toward the shuttle along the axial direction is fixed to each of the transport plates 10 and 10, and the other of the holding portions 11 and 11 is fixed. A bobbin case gripping means (not shown) capable of gripping or releasing the bobbin case is fixed to each end (end facing the shuttle). As the bobbin case gripping means, for example, an automatic bobbin thread feeder of Japanese Unexamined Patent Publication No. 5-192476 or Japanese Patent Application No. 5-12196 previously filed by the present applicant.
The automatic bobbin thread automatic threading machine of Japanese Patent Application No. 5-116363 filed by the applicant of the present application, including a pair of electromagnet adsorption heads described in the automatic bobbin thread feeder of the sewing machine of No. 0 specification. Appropriate ones such as those using the lever claws described in the supply device can be adopted, and the point is that the bobbin case 2 may be an opposing member (for example, the shuttle 1) if necessary.
Anything that can be attached to and detached from is acceptable.

A rotary gear 13 is fixed to the outer periphery of the transfer block 12, and the rotary gear 13 has a long drive shape along the shuttle shaft 1a as shown in FIG. The gear 19 is meshed. One end of the drive gear 19 is a motor fixing plate 21 attached to the base plate 3.
Is rotatably supported by a portion projecting to the other end side of the transport shaft, and the other end is directly connected to the output shaft of a rotary motor 20 as a drive means fixed to the motor fixing plate 21. There is.

Therefore, when the rotation motor 20 rotates, the transfer block 12 is moved through the drive gear 19 and the rotation gear 13.
Also, a rotating arm 70 as a rotating means composed of the transport 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. 3 to 5). 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 on the outer periphery of the transport block 12. A linear motion collar 14 is rotatably supported between the stop ring and the stop ring.

As shown in FIG. 4, 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 as a moving means fixed to the base plate 3.

Therefore, when the air cylinder 18 is driven, the rotary arm 70 is moved along the axial direction of the transport shaft 4 together with the linear motion collar 14 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 attached to the open end side of the conveying shaft 4, and a rotation sensor 31 including a light emitting element 31a and a light receiving element 31b is attached on the sensor fixing plate 33. ing. In addition, as shown in FIGS. 2 and 3, the sensor plate 3 is attached to the rotating arm 70.
2 is fixed, and the rotation sensor 31 and the sensor fixing plate 3 so that the sensor plate 32 can pass between the light emitting element 31a and the light receiving element 31b when the rotation arm 70 rotates.
3 and the position of the sensor plate 32 are adjusted.

A dummy shaft 6 as a bobbin case holding means is provided at a position opposite to the rotation locus of the bobbin case holding means on the base plate 3 and directly below the shuttle 1 as shown in FIG. Is fixed. As shown in FIG. 6, the dummy shaft 6 has the same structure as the inner hook shaft 5, and the bobbin case 2 in which the bobbin is accommodated can be pushed in to hold the bobbin case 2. . Then, as shown in FIG. 1, the existing bobbin locking claws 2d of the bobbin case 2 that have been pushed in are inserted into the dummy shaft 6 as shown in FIG.
It is configured to be engaged with the locking groove of the detent member 5aa provided in the vicinity of. That is, the bobbin case 2 is positioned and held at a predetermined position.

By the way, the lower thread winding position C and the residual thread removing position B are, as shown in FIG. 1, a range V below the conveying shaft 4 and a sewing machine bed 10 from an upright plane along the coaxial line.
It is located in the range W on the side of the rotation fulcrum 103 when raising 1, and is located at a position opposite to the rotation trajectory of the bobbin case gripping means. The residual thread removing position B is arranged below the lower thread winding position C. Further, the position of the residual thread removing position B in the transport axis direction (the direction perpendicular to the paper surface in FIG. 1) is 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 the bobbin case gripping means. Is at a position slightly advanced from the retracted position (position advanced toward the paper surface in FIG. 1).

At the lower thread winding position C, the lower thread winding device 16 is provided.
2 are provided. The lower thread winding device 162 may be any one as long as the lower thread can be automatically wound around the bobbin by driving a motor or the like, and then the bobbin case 2 can be threaded and cut. For example, the automatic bobbin thread feeder of Japanese Unexamined Patent Publication No. 5-192476 or Japanese Patent Application No. 5-1219 previously filed by the present applicant.
No. 60 specification automatic bobbin thread feeder for sewing machines and Japanese Patent Application No. 5-
Appropriate ones can be adopted, including the bobbin thread winding device described in the automatic bobbin thread feeder of the sewing machine of the specification 116363.

A residual yarn removing device 161 is provided at the residual yarn removing position B. Hereinafter, the residual yarn removing device will be described with reference to FIGS. 7 and 8.

In FIG. 7, reference numeral 81 indicates a rotating shaft. The rotating shaft 81 is rotatably supported by both side plates 80a and 80b of the U-shaped plate 80, and both ends thereof project outward from the side plates 80a and 80b. Side plate 80
A drive roller 60 as a rotating body is fixed to a shaft portion protruding leftward in the drawing from a, and a gear 82 is fixed to a shaft portion protruding rightward in the drawing from the side plate 80b. A gear 83 meshing with the gear 82 is arranged above the gear 82, and the gear 83 is fixed to an output shaft of a drive motor 84 fixed to the side plate 80b.

That is, when the drive motor 84 is driven,
The rotation is decelerated by the gears 83 and 82 and transmitted to the shaft 81, so that the drive roller 60 rotates.

Further, in the U-shaped plate 80,
Another U-shaped plate 85 is arranged. The rotary shaft 8 is attached to both side plates 85a and 85b of the U-shaped plate 85.
6 is rotatably supported, and a driven roller 61 as a rotating body is provided on a shaft portion protruding leftward from the side plate 85a in the figure.
Is fixed. A shaft 87 penetrating both side plates 85a and 85b is fixed to the upper end of the U-shaped plate 85 in FIG. The shaft 87 has the side plates 80a and 80b.
A gear 88 is fixed to a shaft (shaft 87) portion that is rotatably supported by the side plate 80b and projects rightward from the side plate 80b. A gear 89 meshes with the gear 88, and the gear 89 is fixed to a shaft 97 rotatably supported by the plates 95 and 96. A gear 90 is also fixed to the shaft 97, and a gear 91 meshes with the gear 90. The gear 91 is fixed to a shaft 98 rotatably supported by the plates 95 and 96.
A gear 92 is also fixed to this. A gear 93 is meshed with the gear 92, and the gear 93 is fixed to an output shaft of a rotary motor 94 fixed to a plate 96.

That is, when the rotation motor 94 is driven,
The rotation is significantly reduced by the gears 93, 92, 91, 90, 89, 88 and transmitted to the shaft 87. With the shaft 87 as a fulcrum, the U-shaped plate 85 and the driven roller 6 are used.
1 is designed to rotate. As described above, the rotation speed is significantly reduced, so that the rotation speed is relatively low (slow speed) (the reason will be described later).

When the rotation motor 94 is driven to rotate the driven roller 61 about the shaft 87 as a fulcrum, the driven roller 6 is rotated.
1 is opposed to the driving roller 60, and when the driving roller 60 is rotated by the driving of the driving motor 84, the bobbin thread can be discharged downstream in cooperation with the driving roller 60 while winding the bobbin thread end portion. (See below for details).

When the rotation motor 94 is driven and the U-shaped plate 85 and the driven roller 61 rotate about the shaft 87 as a fulcrum, the rotation shaft 86 for fixing the driven roller 61 is the U-shaped plate 80. The side plate 80a is appropriately formed with a notch or the like so as not to hit the side plate 80a.

In the residual thread removing device 161, the bobbin case 2 of the bobbin case 2 which is set to the residual thread removing position B by the rotating arm 70 has a lower thread leading portion (lower thread leading hole under the lower thread tension spring). An air nozzle 100 for dropping yarn is provided so that air can be blown toward it. The thread drooping air nozzle 100 is for reliably hanging the bobbin thread drawn from the bobbin case 2 from the bobbin case 2 and attached to the bobbin case 2 downward by the air force.

Further, as shown in FIG. 8, the rotating arm 70 of the bobbin exchanging device 160 described above has a lower thread end that hangs from a bobbin case 2 (specifically, a lower thread tension spring) under which the bobbin is housed. An air nozzle 51 that blows the part M to the working position is fixed. The working position referred to here is a position where the bobbin thread end portion M is in contact with the outer peripheral surface of the drive roller 60 (correctly, the outer peripheral surface on the lower side in the drawing) and flutters downstream (see FIG. 8B). In order to blow the bobbin thread end portion M to the working position, the air from the air nozzle 51 is blown toward the outer peripheral surface of the bobbin case 8 and the outer peripheral surface of the drive roller 60 is moved along the outer peripheral surface. Achieved by creating a heading flow.

The reference numerals 50 and 50 indicate that the yarn end portion M blown to the working position by the air nozzle 51 moves in the axial direction of the rollers 60 before being discharged by the rollers 60 and 61, and the distance between the rollers is increased. The bar for preventing the thread from coming off is shown to prevent the thread from coming off more.

Therefore, as is clear from the figure, the residual thread removing device 161 is constructed such that the main part thereof is disposed below the residual thread removing position B.

When the residual yarn removing device 161 and the bobbin winding device 162 come into contact with the base plate 3, the base plate 3 is appropriately cut. In FIG. 1, the remaining yarn removing position B, the bobbin winding device C, and the bobbin attaching / detaching position D with respect to the dummy shaft 6 are close to each other, and the holding portion 11 and the bobbin case 2 are exaggerated. . Therefore, there is a concern that the holding unit 11 may contact the residual yarn removing device 161 and the bobbin winding device 162, but in reality, a sufficient space is secured to prevent such contact.

By the way, in the present embodiment, the bobbin case gripping means can be moved by the air cylinder 18 to the bobbin case attaching / detaching position (hook position) A and the retracted position moved to the opposite hook side. Then, the origin position is searched at the retracted position (see FIGS. 3 to 5). 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, for example, when a pulse motor is used as the rotation motor 20, the number of pulses of the pulse motor is counted to move the bobbin case gripping means to the bobbin position A, the bobbin winding. The rotation can be controlled to the turning position C, the residual yarn removing position B, and the dummy position D.

Next, the operation of the apparatus thus constructed will be described below. First, for example, in order to allow one of the bobbin case gripping means to grip the bobbin case containing the bobbin wound bobbin, a hand is inserted from the rotating arm side to accommodate the bobbin wound bobbin. Similarly to the case where the bobbin case is mounted on the inner hook shaft 5, the bobbin case is mounted on the dummy shaft 6 by pushing it into the dummy shaft 6 without turning the palm.

Next, when the power switch is turned on, the rotary arm 70 is returned to the original position, and when the start switch is turned on, the rotary arm 70 is rotated so that one of the bobbin case gripping means faces the dummy position D. Let Then, the rotating arm 70 is moved forward to cause one bobbin case holding means to hold the bobbin case that holds the bobbin wound on the dummy shaft 6. At this time, the other bobbin case holding means moves toward the shuttle without interfering with any obstacle.

Here, when the dummy shaft 6 is provided at a position on the opposite side of the residual yarn removing position B or the bobbin winding position C with respect to the transport shaft 4, the residual yarn removing position B is the above-mentioned position. As described above, 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 a position slightly advanced from the retracted position of the bobbin case gripping means. When one of the bobbin case gripping means faces the dummy shaft 6, the other bobbin case gripping means collides with the residual thread removing device 161 and the bobbin thread winding device 162. However, in this embodiment,
As described above, since the dummy shaft 6 is arranged at a position directly below the shuttle 1 at a position opposite to the rotation locus of the bobbin case gripping means, there is no problem.

Then, the rotating arm 70 is moved backward and rotated so that one bobbin case holding means holding the bobbin case faces the hook 1 and is moved forward.
Install the bobbin case containing the bobbin with the bobbin wound inside the hook. At this time, the other bobbin case holding means moves toward the dummy shaft 6 without interfering with any obstacle. Then, the rotating arm 70 is retracted. At this time, the operator again inserts his hand from the rotating arm side in the same manner as above,
The bobbin case containing the bobbin on which the bobbin thread has been wound is mounted on the dummy shaft 6.

Next, when the sewing is started, the bobbin wound with the bobbin thread held on the dummy shaft 6 is accommodated in one of the bobbin case gripping means by the same operation as above during the sewing. The bobbin case is gripped and the rotating arm 70 is retracted.

If a bobbin replacement command is issued, for example, because the bobbin in the hook has run out of residual yarn,
The sewing operation of the sewing machine is prohibited, the rotating arm 70 is rotated, the bobbin case gripping means not gripping the bobbin case is made to face the shuttle 1 and is moved forward, and the bobbin with less remaining thread is removed from the shuttle. Then, the rotating arm 70 is retracted.

Next, the rotary arm 70 is rotated to make the bobbin case containing the bobbin wound bobbin face the hook 1 and move forward, so that the bobbin case containing the bobbin wound bobbin is placed in the hook. After mounting, the rotating arm 70 is retracted.

Then, when the sewing is started, the rotating arm 70 is rotated during the sewing to move the bobbin in which the residual thread is reduced to the residual thread removing position B. Then, the thread dropping air is supplied from the air nozzle 100 for thread dropping, as shown in FIG.
As shown in (a), it is sprayed intermittently for a predetermined period of time to surely hang the lower thread downward from the lower thread leading portion (lower thread leading hole under the lower thread tension spring) of the bobbin case 2. Blow the yarn guide air from the air nozzle 51 (Fig. 8
(See (b)), the lower thread end portion M hanging from the bobbin case 2 is blown to the working position, and then the rotation motor 94 is driven to slowly rotate the driven roller 61 about the shaft 87 as a fulcrum (FIG. 8 (b). )reference).

Then, the driven roller 61 becomes the driving roller 60.
However, before the lower thread end portion M is sandwiched between the rollers 60 and 61, the blowing of air by the air nozzle 51 is stopped.

Here, the lower thread end portion M is provided between the rollers 60 and 61.
When air is blown by the air nozzle 51 when the paper is clamped, the air passing between the rollers 60 and 61 and passing downstream is blocked by the rollers 60 and 61, and the bobbin thread end portion M is moved to the rollers 60 and 61. Run away from the space, roller 60,
Although the winding and discharging by 61 are not performed, the bobbin thread end portion M blown to the working position by the air nozzle 51 is moved by the roller 61 to move the rollers 60, 6 like the present embodiment.
When the air from the air nozzle 51 is shut off before being sandwiched between the two, the bobbin thread end portion M that has been blown up hangs down on the outer peripheral surface of the rotating driven roller 61, and the driven roller 61 is further moved. When the roller rotates so that the rollers 60 and 61 face each other, the lower thread end portion M is sandwiched between the rollers 60 and 61.

The timing of such lower thread clamping, that is, before the driven roller 61 opposes the drive roller 60 while rotating the driven roller 61, the air nozzle 51
The timing of stopping the air is extremely difficult to take when the driven roller 61 is swung quickly by, for example, a solenoid, but in the present embodiment, many timings are required so that the timing can be easily taken. Gears 93, 92,
The rotation speed is set to a low speed (slow speed) via 91, 90, 89 and 88.

Then, when the drive motor 84 is driven and the drive roller 60 is rotated, the bobbin thread that has been sandwiched is discharged downstream while being wound around the rollers 60 and 61 by the cooperation of the rollers 60 and 61 ( 8 (c)), the residual yarn is removed.

Then, the rotating arm 70 is rotated,
The empty bobbin is opposed to the bobbin thread winding position C, the rotating arm 70 is moved forward, and the bobbin thread is wound on the empty bobbin by the bobbin thread winding device 162, and the bobbin case is hooked and the bobbin thread is cut. To do. Here, the rotation arm 70 is moved forward because, for example, the clutch portion of a mechanism for rotating the bobbin to wind the bobbin thread around the bobbin shaft enters the existing hole of the bobbin to rotate the bobbin in the rotating direction. This is because the connection of

In this way, when the bobbin thread 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 not gripping the bobbin case faces the shuttle 1 and is moved forward to take out the bobbin with a small amount of residual thread from the shuttle and move the rotating arm 70. Retreat.

Next, 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, in the case of taking out the bobbin case 2 held by the bobbin case holding means or in the case of temporarily holding the bobbin case 2 on the dummy shaft 6 in order to use the lower thread of different colors. When the bobbin case gripping means gripping the bobbin case 2 faces the dummy shaft 6 and is moved forward, the bobbin case 2 gripped by the bobbin case gripping means can be transferred to the dummy shaft 6.

When the bobbin case 2 held by the dummy shaft 6 is taken out, the palm is returned by inserting the hand from the rotating arm side, similarly to taking out the bobbin case 2 from the inner hook shaft 5. Instead, the bobbin case held on the dummy shaft 6 can be taken out. It is very easy to take out the bobbin case from the dummy shaft 6 by this manual work.

As described above, in the present embodiment, the residual thread removing position B and the bobbin thread winding position C are positions opposite to the rotation locus of the bobbin case gripping means, and the transport shaft rotates together with the bobbin case gripping means. 4 is arranged in a range V below 4 and a range W on the rotation fulcrum 103 side when the sewing machine bed 101 is raised from the upright plane along the coaxial line.
Also, since the lower thread winding device 162 is configured to move inward from the rotation locus X on the outer peripheral side when the sewing machine head is raised, interference with the sewing machine table 102 is made without making the device components small and elaborate. Since it is possible to prevent (contact), it is possible to reduce the cost of the device and to simplify the assembly work and the work such as wiring and piping and improve the maintainability. Has become. In addition, since the devices are configured to approach each other in the same manner, it is possible to concentrate wiring, piping and the like, which is advantageous in terms of space, and waste of the rotating operation of the bobbin case gripping means is possible. It is possible to reduce.

Incidentally, as shown in FIG. 1, the lower shaft of the sewing machine is located at a position opposite to the rotation locus of the bobbin case gripping means and above the transport shaft 4 rotating together with the bobbin case gripping means. Since 104 and 105 are installed close to each other, the lower yarn winding device 162 and the residual yarn removing device 1 are provided in the range.
It is difficult to place 61.

Further, when the bobbin case gripping means is moved in the axial direction to the bobbin case attaching / detaching position (hook position) A, the bobbin case on the opposite side of the bobbin case gripping means in the rotating arm 70 with the transport shaft 4 as the center. Since the gripping means also moves in the axial direction in the same manner, a clearance space that does not interfere with the bobbin case gripping means on the opposite side is required in the movement path of the bobbin case gripping means on the opposite side. The bobbin case gripping means is arranged directly below the shuttle at a position opposite to the rotation trajectory, and the bobbin case gripping means is moved in the axial direction to move to the bobbin case attaching / detaching position (hook position) A and to the dummy shaft 6. In both cases, since the bobbin case gripping means on the opposite side does not interfere with the facing member, the clearance space required when the dummy shaft 6 is provided. Newly provided need is gone.

The residual thread removing device 161 roughly rotates the bobbin by the thread drawing operation of the drawing means for drawing the thread M wound around the bobbin and hanging from the thread drawing portion of the bobbin case 2. Since it is configured as described above, the main part thereof is arranged below the residual yarn removing position B. Therefore, when the residual thread removing position B and the bobbin thread winding device C are replaced with each other, there is no space for arranging the main part of the residual thread removing device 161, but in the present embodiment, the residual thread removing position B is changed to the bobbin thread winding position. Since it is arranged below C and the space below the residual yarn removing position B is made to be an empty space, it is possible to arrange the residual yarn removing device by utilizing this empty space. . Further, since the residual thread removing position is located below the bobbin thread winding position, the residual thread removed by the residual thread removing device can be promptly discharged as another device without being entangled in the bobbin thread winding device. Has become.

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, in the above embodiment, the bobbin case holding means is the dummy shaft 6, but the dummy shaft 6 is not limited to the dummy shaft 6, and the bobbin case 2 is magnetically attracted by, for example, a magnet. It is also possible to replace with the bobbin case holding means which is housed and held in the holder.

Further, the residual thread removing device 161 of the above embodiment is not limited to the one having the above construction, and for example, Japanese Patent Application No. 5-203612 and Japanese Patent Application No. 6-203612 previously filed by the present applicant. It is also possible to replace the bobbin residual yarn removing device described in the specification of No. 309909. Even in these residual thread removing devices, the basic configuration is that the bobbin is rotated by the thread drawing operation of the drawing means for drawing the thread M wound around the bobbin and hanging from the thread drawing portion of the bobbin case 2. It is designed to be pulled out.

[0070]

As described above, according to the bobbin thread automatic feeder of claim 1, the residual thread removing position and the bobbin thread winding position are
A position opposite to the rotation trajectory of the bobbin case gripping means,
The residual thread removing device and the bobbin thread winding device are arranged in a range on the rotation fulcrum side when raising the sewing machine bed from the upright plane including the rotation axis of the rotating means that rotates together with the bobbin case gripping means. Since it is configured to move inwardly from the rotation trajectory on the outer peripheral side when the head is raised, interference (contact) with the sewing machine table can be prevented without making the device components small and elaborate, and the device The cost can be reduced, and the assembling work and the work such as wiring and piping can be simplified and the maintainability can be improved. In addition, since the devices are configured so as to approach each other in the same manner, it is possible to concentrate wiring, piping, etc., which is advantageous in terms of space, and reduces the waste of the rotating operation of the bobbin case holding means. It becomes possible to do.

According to the bobbin thread automatic feeder of claim 2, in addition to claim 1, when the bobbin case gripping means is moved in the axial direction to the bobbin case attaching / detaching position (hook position), the rotating means moves. Since the portion of the bobbin case holding means on the side opposite to the center also moves in the axial direction, the movement path of the opposite side portion requires an escape space that does not interfere with the opposite side portion. When the bobbin case holding means is arranged directly below the hook at a position opposite to the rotation path of the bobbin case gripping means and the bobbin case gripping means is moved in the axial direction to move to the bobbin case attaching / detaching position (hook position) and the bobbin case Since it is configured so that the opposite side portion does not interfere with the facing member when moving to the holding means, the escape gap required when the bobbin case holding means is provided. There is no need to provide a new over the nest.

According to the bobbin thread automatic feeder of claim 3, in addition to claim 2 or 3, the residual thread removing device generally draws the thread hung from the thread pulling part of the bobbin case. Since the bobbin residual yarn is removed by rotating the bobbin, the main part of the residual yarn removing device is arranged below the residual yarn removing position, but the residual yarn removing position is arranged below the bobbin thread winding position. However, since the space below the residual thread removal position is configured to be an empty space,
It is possible to arrange the residual yarn removing device by utilizing this empty space. Further, since the residual thread removing position is arranged below the lower thread winding position, the residual thread removed by the residual thread removing device is promptly discharged without being entangled with another device, for example, the lower thread winding device. It is like this.

[Brief description of drawings]

FIG. 1 is a front view showing a schematic configuration of a lower thread automatic feeder according to an embodiment of the present invention.

FIG. 2 is a front view of a bobbin exchanging device used in the same upper and lower yarn automatic feeding device.

FIG. 3 is a plan view of the above bobbin changing device.

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

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

FIG. 6 is a schematic side view for explaining dummy positions and dummy axes.

FIG. 7 is a plan view of a residual yarn removing device used in the same upper and lower yarn automatic feeding device.

FIG. 8 is a view for explaining the operation of the above residual thread removing device;
FIG. 3 is a back side explanatory view showing only the main part of FIG.

FIG. 9 is a schematic perspective view showing an automatic bobbin thread feeder in the prior art.

FIG. 10 is a front view showing a schematic configuration of the lower thread automatic feeder shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 shuttle 1a shuttle shaft 2 bobbin case 4 rotating means shaft 5 inner shuttle shaft 6 bobbin case holding means 18 moving means 20 driving means 70 rotating means 101 sewing machine bed 103 rotation fulcrum of sewing machine bed 160 bobbin exchanging device 161 residual thread removing device 162 bobbin winding device A bobbin attachment / detachment position B residual thread removal position C bobbin winding position D attachment / detachment position with respect to bobbin case holding means V range below axis of rotation means W rotation fulcrum of sewing machine bed from upright plane along axis Side range

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Claims (3)

(57) [Claims] 1. A rotating means rotates about a rotational axis parallel to the hook shaft of the sewing machine has a gripping or openable bobbin case holding means bobbin case accommodating the bobbin, and the <br/> said rotating means A bobbin changing device including a moving means for moving in the direction of the rotation axis, a bobbin thread winding device for winding a bobbin thread on the bobbin, and a residual thread removing device for removing the residual thread of the bobbin are machined together.
Provided at the bottom of the de, in the position facing the rotation axis direction with respect to the rotation locus of the bobbin case holding means, centered on the axis of rotation of said rotating means, a bobbin mounting and dismounting position to attach and detach the bobbin relative to the kettle, residual yarn residual thread removal position for removing the residual yarn of the bobbin in the removal device, Te lower thread automatic feeder odor placing the bobbin thread winding position for winding the bobbin thread in the bobbin thread winding device, the residual thread removal position and the lower A bobbin thread automatic feeding device characterized in that a bobbin winding position is arranged in a range closer to a rotation fulcrum when raising a sewing machine bed than an upright plane including a rotation axis of the rotating means. 2. The automatic bobbin thread feeder according to claim 1, wherein the bobbin case holding means capable of holding the bobbin case accommodating the bobbin is arranged directly below the hook at a position opposite to the rotation locus of the bobbin case holding means. An automatic bobbin thread feeder. 3. A bobbin case containing a bobbin is gripped.
Or openable bobbin case gripping means
A bobbin exchanging device for moving the bobbin along the bobbin, a bobbin winding device for winding a bobbin around the bobbin, and a residual yarn removing device for removing the residual yarn of the bobbin. , The residual thread removal
Residual thread removing position for removing residual thread of the bobbin in the removing device,
Arrange the lower thread winding position for winding the lower thread in the lower thread winding device.
The automatic bobbin thread feeder, wherein the residual thread removing position is located below the bobbin thread winding position in the placed bobbin thread automatic feeder.