JPH0884881A - Residual thread eliminator for bobbin - Google Patents

Abstract

PURPOSE: To surely eliminate residual thread and to improve reliability for a residual thread eliminator by winding a bobbin needle terminal part derived from a bobbin case on a winding means, performing the relative displacement of the winding means and a handling means along a uniaxial line and blowing the air to the residual thread. CONSTITUTION: The bobbin case 8 incorporating a bobbin thread-wound bobbin 7 is loaded on a pot at a position to load/unload the bobbin case by driving a turning arm 5. Then, the turning arm 5 is retreated, and rotated in a clockwise direction by 60 deg., and the bobbin case 8 is moved to a residual thread eliminating position, then, the residual thread on the bobbin 7 is eliminated. At this time, the air is blown from a first air nozzle 51, and the bobbin thread M suspending from the bobbin case 8 is hung on a guide. The bobbin thread M is wound by driving a winding fork 81. Then, a thread elimination shaft 71 and the winding fork 81 are retreated by an air cylinder 121 as blowing the air from a second air nozzle 52, and the bobbin thread M is handled by a handling plate 40, and it falls from the winding fork 81.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In a sewing machine for sewing using an upper thread and a lower thread, particularly for an industrial sewing machine that performs high-speed sewing work, it is necessary to frequently replace a bobbin wound with a lower thread. is there. Generally, when the 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.

The outline structure of the bobbin thread supply device of the sewing machine disclosed in Japanese Patent Laid-Open No. 5-192476 is such that a bobbin around which a bobbin thread is wound is housed inside, and a bobbin case is mounted in the sewing machine hook. A bobbin case gripping means (electromagnetic attraction head) capable of gripping and releasing the bobbin case and a moving means including a rotating arm capable of rotating the bobbin case gripping means about one axis as a fulcrum and sliding in the axial direction. A bobbin changing device and a bobbin winding device that is arranged axially away from the shuttle and winds a bobbin around the bobbin.

In addition to the above-mentioned device, the device described in Japanese Patent Application No. 5-203612 has a yarn removing shaft and one end fixed to the yarn removing shaft and arranged around the yarn removing shaft so as to extend in the axial direction. A winding means composed of a plurality of elastic linear bodies projecting to
A receiving shaft which receives the winding means which is opposed to the winding means and which moves forward, expands the elastic linear body outward with the fixed end as a fulcrum, and which rotates together with the winding means, and the periphery of the winding means. And a retracting device that is capable of retracting the residual yarn wound around the winding device between the retracting device and the retracting device that is retracted from the bobbin case. The remaining thread wound on the bobbin is obtained by holding the lower thread end portion of a predetermined length (about 35 to 40 mm) between the receiving shaft and the thread removing shaft, and rotating the winding means for a predetermined period. Is wound around the elastic linear body, and then the winding means is retracted to remove the elastic linear body from the receiving shaft to return the expanded elastic linear body to the original position. Looseness was caused between the elastic linear body and the wound residual yarn, and the wound yarn was wound by the handle plate. By squeezing the yarn has a structure of removing by dropping the remnant yarn downward.

In the bobbin thread automatic feeding device, the bobbin case gripping means is turned into the shuttle, the residual thread removing device and the bobbin thread winding device by pivoting about one axis of the pivot arm. With a movable structure, bobbin winding work, residual yarn removal work, and bobbin case replacement work are performed automatically, improving work efficiency and productivity. It is designed to be used.

However, the above-mentioned Japanese Patent Application No. 5-20361.
The apparatus described in No. 2 has the following problems. That is, in the above residual yarn removing device, the residual yarn wound around the elastic linear body is removed by moving the winding means with respect to the handle plate. When the expanded elastic linear body returns to its original position, a part of the wound residual thread may be caught (entangled) between the elastic linear bodies. There is a problem in that the remaining yarn that has been taken cannot be removed and the reliability of the device is reduced.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a bobbin residual yarn removing device capable of reliably removing the wound residual yarn and improving reliability.

[0010]

In order to achieve the above object, the bobbin residual thread removing device of the present invention is derived from a rotatably supported bobbin and a bobbin case that accommodates the bobbin therein. A winding means that has a holding member that can hold or release the lower thread end, and can wind around a bobbin thread that is held by the holding member by rotating about one axis and winding the winding means. By handling the residual yarn wound around the winding means by relative movement with respect to the means, the handling means for handling and removing the residual yarn by the handling means, Air means for blowing air toward the residual yarn wound around the winding means.

[0011]

According to the bobbin residual thread removing device in such means, the bobbin residual thread drawn out from the bobbin case is clamped by the clamping member, and when the winding means rotates, the bobbin residual thread around the winding means. Is wound up. When the winding means and the handling means on which the residual yarn has been wound are moved relatively along the uniaxial line, the residual yarn wound around the winding means is handled by the handling means. Since the air is blown toward the residual yarn wound around the winding device by the air device, the residual yarn wound around the winding device is surely prevented from being entangled with the winding device. Drop from the winding means.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. First, with reference to FIGS. 4 to 8, the outline of an automatic bobbin thread supplying device to which the bobbin residual yarn removing device of the present invention is applied will be described.

This automatic bobbin thread feeder is provided with a sewing machine bed 1.
Is placed in the space where the bottom below is an oil reservoir,
As shown in FIGS. 4 and 8, the bobbin case attaching / detaching position A, the residual thread removing position B, and the bobbin thread winding position C are 120 around a single axis.
As shown in FIGS. 4, 5 and 8, the bobbin case attachment / detachment position A and the other work positions B and C are separated at both ends of the one shaft, and are located in the space. The upright pillar 2 and the main base 3 mounted on the pillar 2.
A guide shaft 4 which is one axis horizontally supported by the main base 3, a rotating arm 5 which is rotatable together with the guide shaft 4 and slidable in the axial direction, and a guide shaft 4. It comprises a forward / backward lever 6 for advancing and retracting the rotating arm 5 along with, and a drive device for rotating the rotating arm 5 forward or backward in units of 60 °.

As shown in FIG. 8, the guide shaft 4 is rotatably supported by the standing portion of the main base 3 at both ends.
As shown in FIG. 7, its cross section is non-circular, and the shape of the hole of the corresponding boss 5a of the rotating arm 5 is also the same. Therefore, the rotating arm 5 can slide along the guide shaft 4 and can rotate together with the guide shaft 4.

As shown in FIGS. 4 and 8, the rotating arm 5 symmetrically extends slightly from the center to both sides,
As shown in FIG. 8, a bobbin case 8 containing a bobbin 7 is detachably supported near each end. As a bobbin attaching / detaching mechanism as a bobbin case gripping means in the rotating arm 5, for example, a bobbin thread automatic feeding device disclosed in Japanese Patent Laid-Open No. 5-192476, or a Japanese Patent Application No. 5-52 previously filed by the present applicant.
In a bobbin exchanging device for a sewing machine disclosed in Japanese Patent Application No. 5-116363 previously filed by the applicant of the present invention, a pair of electromagnet adsorption heads described in the bobbin exchanging device for sewing machine of Japanese Patent No. Appropriate ones such as those described with lever claws can be adopted.

The forward / backward lever 6 is rotatably supported by a shaft 9 provided upright on the main base 3, as shown in FIGS. A long hole 6a is formed near the free end. The other end is rotatably attached to a shaft 13 fixed to a knuckle 12 at the rod tip of an air cylinder 11 attached to the main base 3 by a support plate 10. Then, the long hole 6a of the forward / reverse lever 6
As shown in FIGS. 6 and 7, the boss 5 of the rotary arm 5 is
A pin 15 projecting from the surface of a collar 14 rotatably attached to a is engaged. Therefore, when the rod of the air cylinder 11 expands and contracts, the forward / backward lever 6
Rotates in the positive and reverse directions about the axis 9. Along with this, the rotating arm 5 engages with the pin 15 that engages with the long hole 6a of the forward-reverse lever 6.
The vehicle travels forward and backward along the guide shaft 4 via. That is,
The rotating arm 5 has a bobbin case attachment / detachment position A side, which is a sewing position where the shuttle 16 shown in FIGS. 6 and 8 is disposed, and an opposite side thereof (remaining thread removing position B and bobbin thread winding position C). )
Can be moved forward and backward along the guide axis 4.

As shown in FIGS. 4 and 5, the rotary driving device for the rotating arm 5 is constructed by a bracket 1 below the main base 3.
A motor 19 attached to a bracket 18 fixed to 7, and a gear 21 fixed to a rotating shaft 20 thereof,
A gear 22 that is rotatably supported by a bracket 17 and meshes with a gear 21, and an original vehicle 2 fixed to one surface of the gear 22.
3, a pin 24 and a Geneva mechanism composed of a driven wheel 25 rotatably supported by a bracket 17, a gear 26 coaxially fixed to the driven wheel 25, and a gear 26 fixed to the guide shaft 4 (see FIG. 6). And a gear 27 that meshes.
Therefore, by configuring the gear 26 and the gear 27 with a predetermined gear ratio, the rotating arm 5 is rotated by the Geneva mechanism of the rotary drive device by the motor 19 as a drive source in units of 60 ° via the guide shaft 4. .

A bobbin winding device is arranged at the bobbin winding position C. The bobbin winding device may be any device as long as the bobbin can be automatically wound around the bobbin 8 by driving a motor, for example, as disclosed in Japanese Patent Laid-Open No. 5-192476. It is described in the bobbin automatic feeder and the bobbin exchanging device of the sewing machine described in Japanese Patent Application No. 5-121960 and the sewing machine bobbin exchanging device of Japanese Patent Application No. 5-116363 previously filed by the present applicant. Appropriate ones can be adopted including the bobbin winding device.

At the residual yarn removing position B, the residual yarn removing device shown in FIGS. 1 to 3 is arranged. This residual thread removing device blows the lower thread (bobbin thread) M of the bobbin 7 that hangs down from the bobbin case 8 to the working position (specifically, the axis of a thread removing shaft 71 described later). The first air nozzle 51 that blows toward the front) is provided. The blowing of the lower thread M to the working position is performed by the first air nozzle 5
This is achieved by blowing air from 1 toward the outer peripheral surface of the bobbin case 8 and creating a flow along the outer peripheral surface toward the work position.

The residual thread removing device, as shown in FIG. 1, also includes a guide 61 for holding the blown bobbin thread M, and
A slide guide 38 fixed to a base 70, a slide plate 39 slidable in the slide guide 38 in the left-right direction in the figure, a motor 37 fixed to the upper part of the slide plate 39, and a slide plate for the motor 37. An air cylinder 121 that slides in the longitudinal direction (left and right direction in the drawing) of the slide guide 38 together with 39, and is moved back and forth by the operation of the air cylinder 121 and is rotated by the drive of the motor 37 and axially on the outer peripheral surface. Thread removal shaft 71 having a plurality of concave grooves 71a formed along it (see FIG. 3)
And is fitted into each groove 71a, the rear end (the end portion on the right side in FIG. 1) is planted on the thread removing shaft 71, and the other end (FIG.
The end portion on the left side in (1) is free to rotate on the base 70 at a position opposed to the winding fork 81 such as a wire as an elastic linear body having elasticity and the thread removing shaft 71 in the axial direction. The receiving shaft 91 that is axially supported and has a taper shape in which the end on the yarn removal shaft 71 side has a larger diameter toward the left in the figure, and the yarn removal shaft 71 that moves backward
And a handling plate 40 as a handling means supported by the base 50, in which a through hole through which the yarn removing shaft 71 and the winding fork 81 slide is formed when the winding means 60 including the winding fork 81 moves forward and backward. It consists of

The residual yarn removing device further includes a second air nozzle 52 which is a feature of the present invention. As shown in FIGS. 1 and 2, the second air nozzle 52 has its outlet port directed toward the residual yarn to be wound around the winding fork 81 (hence, the yarn removing shaft). It is arranged so as to be directed to the axis of 71) and blows out during the handling operation by the handling plate 40.

In the bobbin thread automatic feeder constructed as described above, the rotation of the motor 19 causes the rotary arm 5 to repeat forward / backward movement in units of 60 ° and to move forward / backward along the guide shaft 4. The bobbin case 8 is reliably transported to the respective work positions A, B, C, and the work is executed or received.

For example, the bobbin case 8 is not held at one end of the rotating arm 5, and the bobbin case 8 containing the bobbin 7 in which the bobbin is wound by the bobbin winding device is held at the other end, and the bobbin case 8 is held. It is assumed that one end that does not hold is waiting at a position D (see FIG. 4) intermediate between A and B. When the predetermined sewing is completed in this state, the rotating arm 5 rotates 60 ° counterclockwise in FIG. 4 and advances to the shuttle side in FIG. 8, and the bobbin case attaching / detaching mechanism causes the bobbin with residual thread in the shuttle. The built-in bobbin case 8 is held at one end of the rotating arm 5.

Next, when the rotating arm 5 is retracted to the retracted position of the guide shaft 4 and is rotated by 180 ° and moved forward, the bobbin case 8 with the bobbin built-in which is held at the other end of the rotating arm 5 and has the bobbin wound therein is wound. The bobbin case is attached to the hook 16 at the attachment / detachment position A. Then, when the rotating arm 5 is retracted and rotated clockwise by 60 °, the bobbin case 8 with a bobbin with a residual thread held at one end of the rotating arm 5 advances to the residual thread removing position B, and remains there. Bobbin 7 by thread removing device
The residual yarn of is removed.

In this residual thread removing device, first, air is blown from the first air nozzle 51, and the lower thread M of the bobbin 7 hanging from the bobbin case 8 is hooked on the guide 6. Next, the yarn removing shaft 71 is moved by the air cylinder 121.
And the winding fork 81 is advanced to move the thread removing shaft 71
The tip is abutted against the receiving shaft 91. Then, the winding fork 81 is fitted along the tapered portion of the receiving shaft 91 so as to open along the tapered portion as shown by the dotted line in FIG.
At this time, the lower thread M of the bobbin 7 hanging from the bobbin case 8 enters the winding fork 81, and further, the thread removing shaft 71
It is sandwiched between the tip and the receiving shaft 91. When the yarn removing shaft 71 and the winding fork 81 are rotated by the motor 37, the lower yarn M is wound around the plurality of winding forks 81.

In this way, when the residual yarn of the bobbin 7 is wound up by the winding fork 81, at the same time when the second air nozzle 52 starts blowing air,
The yarn removing shaft 71 and the winding fork 81 are retracted by the air cylinder 121. Then, the take-up fork 81 is disengaged from the receiving shaft 9 and the interval between the take-up forks 81 is narrowed, so that the wound bobbin thread M is loosened. Since the air is strongly blown out by the nozzle 52, a part of the residual yarn wound up between the winding forks 81 as described above is not caught (entangled).
The bobbin thread M is handled by the handling board 40 and the winding fork 8
It surely falls off from 1 and falls downward.

When the residual yarn is removed in this way, the blowing of air by the second air nozzle 52 is stopped. Then, the rotating arm 5 moves counterclockwise by 120
When rotated and retreated, the bobbin case 8 with a built-in empty bobbin from which the residual yarn has been removed advances to the lower thread winding position C, and the lower thread winding device wound the lower thread around the empty bobbin. After that,
These operations are repeated.

As described above, in this embodiment, the second air nozzle 52 is provided for blowing air toward the residual yarn M wound around the winding fork 81 when the residual yarn is scraped off. So this second
The residual yarn is prevented from being entangled with the take-up fork 81 by blowing air from the air nozzle 52, so that the residual yarn can be reliably removed from the residual yarn removing device.

Further, since the residual yarns that are handled by the handling plate 40 are always blown away in a fixed direction by the second air nozzle 52, in such a direction, for example, a removable residual yarn storage box ( If a dust box is arranged, the residual threads will not be scattered, and it is possible to obtain the effect of preventing problems such as these residual threads being entangled with other mechanisms and stopping the sewing machine. is there.

It is possible to combine the function of the second air nozzle 52 with the function of the first air nozzle 51. However, the first air nozzle 51 has the function of the bobbin case 8 as described above. By blowing air toward the outer peripheral surface and creating a flow toward the working position along the outer peripheral surface, the bobbin 7 lower thread M hanging from the bobbin case 8 is blown to the working position as shown in FIG. That is, the air force is weak because the air is blown indirectly, not by directly blowing air on the wound bobbin thread, so the wound bobbin thread cannot be reliably removed. It is impossible. Further, since the air force is weak in this way, the residual yarns that have been scraped off are scattered without being blown in a certain direction,
Therefore, there is a fear that these residual yarns may be entangled with other mechanisms to cause a problem such as stopping of the sewing machine.

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-described embodiment, the air is blown out by the second air nozzle 52 when the residual yarn is blown off. However, the bobbin thread receiving shaft 91 from the bobbin case is used.
It may be blown at any time except when it is sandwiched between the yarn removing shaft 71 and the yarn removing shaft 71.

The residual yarn removing device is not limited to the device of the above-described embodiment. For example, the receiving shaft 91 is made movable, and only when necessary, the yarn removing shaft 71 is moved to the opposite position. Or the winding means 60 described above.
To rotate and stop at a fixed position,
0 may be moved along the axis so that the residual yarn wound around the elastic linear body 81 may be scraped off, and a device that can be opened and closed by a solenoid or the like to allow the yarn to be clamped may be used. Has a bobbin rotatably supported and a pinching member capable of pinching or releasing a bobbin thread end portion derived from a bobbin case accommodating the bobbin inside. By winding means capable of winding the bobbin thread sandwiched by the member around the winding means, and moving relative to the winding means along one axis,
When the residual yarn wound around the winding means is manipulated, and the residual yarn is manipulated by the handling means,
Any structure may be used as long as it includes an air unit that blows air toward the residual yarn wound around the winding unit.

[0033]

As described above, according to the bobbin residual thread removing device of the present invention, a bobbin rotatably supported,
A bobbin case having a bobbin case accommodated therein has a pinching member capable of pinching or releasing the lower thread end portion,
By winding the bobbin thread that is pinched by the pinching member and capable of being wound around the bobbin thread around the one axis, and moving relative to the winding means along the one axis, Air is blown toward the residual yarn wound around the winding means when the residual yarn wound around the winding means is removed, and when the residual yarn is removed by the handling means. And a blowing means for blowing the air toward the residual yarn wound around the winding means when the residual yarn wound around the winding means is handled by the handling means. Since the residual yarn is configured so as not to be entangled with the winding means, the residual yarn wound around the winding means can be reliably removed, and the reliability of the device is improved. Is possible.

[Brief description of drawings]

FIG. 1 is a side view of a residual yarn removing device showing an embodiment of the present invention.

FIG. 2 is a front view showing, on an enlarged scale, only a main part of the above residual thread removing device.

FIG. 3 is an enlarged sectional view of a yarn removing shaft and an elastic linear body portion of the above residual yarn removing device.

FIG. 4 is a front view showing a bobbin exchanging device of an automatic bobbin thread supplying device to which the above residual thread removing device is applied.

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

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

FIG. 7 is a front view showing a relationship among a rotating arm, a forward / backward moving lever, and a guide shaft that constitute the same bobbin changing device.

FIG. 8 is a perspective view of the same upper and lower yarn automatic feeders.

[Explanation of symbols]

 7 bobbin 8 bobbin case 40 handling means 52 air means 60 winding means 71, 91 clamping member M bobbin thread (bottom thread)

Claims (1)

[Claims] 1. A bobbin that is rotatably supported, and a holding member that can hold or release a lower thread end that is drawn out from a bobbin case that houses the bobbin,
Winding means capable of winding around the bobbin thread that is pinched by the pinching member by rotating around the one axis, and moving relative to the winding means along the one axis, The residual yarn wound around the winding means is
A bobbin residual yarn removing device comprising: a handling means for handling and removing residual thread by the handling means; and an air means for blowing air toward the residual thread wound around the winding means.