JP2001232084A - Residual thread removing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a residual thread removing device which is capable of surely subjecting threads of a wide range of nature to a residual thread removing treatment, is greatly improved in reliability and is simple constitution. SOLUTION: The residual thread removing device 1 is so constituted that a rotationally driven drive roller 33 and a driven roller 48 for drawing out the residual thread by being driven and rotated in the state of abutting on the drive roller 33 are made openable and closable by a roller opening and closing means A. The device is also provided with an air nozzle 10 for guiding a residual thread end Mb by generating an air shower and a bobbin rotation detecting means 50 for detecting the rotation of the bobbin N. For example, as shown in figure 1, the device is provided with a residual thread removing device control means 60 for executing control so as to remove the residual thread after repeating the action to sandwich and draw out the residual thread end Mb by opening and closing the drive roller 33 and the driven roller 48 by the roller opening and closing means A at a prescribed number of times.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, there has been known an automatic lower thread supply device for automatically supplying a lower thread when the lower thread wound on a bobbin is consumed and reduced in the sewing operation. The bobbin automatic supply device replaces the bobbin with a new bobbin wound with the bobbin when the bobbin becomes low, and removes the bobbin with the low bobbin from the shuttle. After removing the bobbin thread remaining on the bobbin with less bobbin thread (hereinafter referred to as "remaining thread"), the bobbin thread is automatically supplied to the bobbin, and then one end side of the bobbin thread is set in the bobbin case. The bobbin case is automatically returned to the shuttle when the bobbin case is replaced in the standby state. In order to supply the bobbin thread, the sewing operation must be interrupted once.However, the interruption of the sewing operation is stopped during the minimum operation of replacing the bobbin, the remaining thread is removed, and the bobbin thread is removed. Is performed in a state where the sewing operation can be returned.

[0003] In order to remove the residual yarn, for example, JP-A-9-108471 and JP-A-11-19738
There is a case where a residual yarn removing device as disclosed in Japanese Patent Publication No. 5 is used. In the above publication, for example, a drive roller that is driven to rotate by a drive source such as a motor, and is disposed in contact with the drive roller, rotates with the drive of the drive roller, and contacts and separates from the drive roller. A possible driven roller, a suction nozzle disposed below a contact portion between the driving roller and the driven roller, and an air nozzle that generates a flow of air and guides the yarn end of the remaining yarn to the contact portion. A bobbin rotation detecting means for detecting a hole in the side surface of the bobbin by a sensor and detecting the rotation of the bobbin; a control means for performing various calculations and detection of the residual yarn removing process and controlling the residual yarn removing device; , Etc., are disclosed.

In the residual yarn removing device, prior to removal of the residual yarn, the air nozzle generates a flow of air while the driving roller and the driven roller are separated from each other to remove the yarn end of the residual yarn extending from the bobbin. A guide is provided between the driving roller and the driven roller. Further, with the yarn end being guided in this way, the driven roller comes into contact with the drive roller, and the remaining yarn is captured by the contact portion. In this state, the drive roller is driven to rotate, and the remaining yarn is drawn out below the contact portion and is sucked by the suction nozzle to remove the remaining yarn. Further, the residual yarn removing device pulls out the residual yarn as described above, and monitors the rotation of the bobbin accompanying this with the output of the bobbin rotation detecting means. When the rotation of the bobbin stops, the residual yarn removing process is performed. Is determined to have ended. According to the above configuration, the remaining yarn can be suitably removed by being pulled out by the driving roller and the driven roller. In addition, since the yarn end is separated from the roller by the air generated by the air nozzle, it is possible to prevent the remaining yarn from entangled with the roller during the removal of the remaining yarn to some extent. Therefore, with some degree of reliability,
Residual yarn removal processing can be performed.

[0005]

As described above, the residual yarn removing device disclosed in the above publication is applicable to a wide range of yarns (such as yarn type and count). However, especially in the case of a soft thread, a crumpled thread, or a thread with a fluffy surface (for example, a cotton thread or a wooly thread), the roller surface tends to be attached due to minute scratches on the roller surface or static electricity. In some cases, entanglement of the yarn with the thread occurred. In addition, in these yarns, the reliability of residual yarn removal was reduced by 10 times or more as compared with tetron yarn, nylon yarn, spun yarn and the like. Further, when such entanglement occurs, the sewing operation must be interrupted and a maintenance operation for removing the entangled thread must be performed, which hinders an efficient sewing operation. Therefore, there has been a demand for a residual yarn removing device capable of reliably performing residual yarn removal processing on yarns having a wide range of properties.

SUMMARY OF THE INVENTION An object of the present invention is to reliably remove residual yarns from a wide variety of yarns, such as soft yarns, crimped yarns, and yarns with a fluffy surface, thereby greatly improving reliability. It is another object of the present invention to provide a residual yarn removing device having a simple configuration.

[0007]

In order to solve the above-mentioned problems, for example, as shown in FIGS. 1 to 5, a residual yarn removing device 1 according to the first aspect of the present invention is a device for removing residual yarn wound around a rotatable bobbin N. A pair of rollers (a driving roller 33 and a driven roller 48) for drawing out the remaining yarn from the bobbin by rotating the yarn end side of the yarn therebetween, and the rollers so as to introduce the remaining yarn between the rollers. Roller opening / closing means A (rotary arm 45 and the like) for opening and closing the rollers so as to open and open the rollers so as to sandwich the residual yarn introduced between the rollers. In the remaining yarn removing device, after the roller is opened and closed by the roller opening and closing means A, and the remaining yarn is introduced and sandwiched between the rollers,
At least once or more, there is provided control means (remaining yarn removing device control means 60, shown in FIG. 10) for controlling to perform an operation of rotating the roller to pull out the residual yarn and an operation of opening and closing the roller. Features.

According to the first aspect of the present invention, after the roller is opened / closed by the roller opening / closing means A and the remaining yarn is introduced and pinched between the rollers, the control means sets the remaining yarn at least once. The operation of rotating the roller to pull out the remaining yarn and the operation of opening and closing the roller are controlled to be performed again. Therefore, for example, even when the remaining yarn has adhered to the roller or the like at the time of the previous opening / closing, when the operation of pulling out the remaining yarn and the operation of opening / closing the roller are performed again, the yarn end of the remaining yarn becomes Since it acts so as to be separated, the remaining yarn can be reliably removed without the yarn end of the remaining yarn being entangled with a roller or the like. Thereby, the reliability of the residual yarn removing device can be significantly improved. In particular, it is possible to reliably remove residual yarn even from yarns that tend to adhere to the roller surface, such as soft yarns, crimped yarns, and fluffy yarns. A residual yarn removing device capable of removing the yarn can be obtained.

Further, when the pair of rollers are open, for example, the flow of air causes the yarn end of the remaining yarn to be separated from the roller or the like and is guided to a predetermined position for removing the remaining yarn. The configuration may be as follows.

When removing the residual yarn, the residual yarn pulled out by the pair of rollers is sucked by air suction or the like so that the residual yarn does not accumulate and become entangled with the rotating roller or other members. It is preferable to adopt a configuration for collecting the pulled-out remaining yarn.

According to a second aspect of the present invention, there is provided a residual yarn removing device.
In the above-described residual yarn removing device, the length of pulling out the residual yarn in one operation of rotating the roller to pull out the residual yarn is shorter than the circumferential length of the roller.

[0012] According to the residual yarn removing device of the second aspect, the same effect as that of the first aspect can be obtained, and in one operation, the residual yarn sandwiched between the rollers can be removed. Since the length pulled out by the rotation is shorter than the circumferential length of the roller, there is no fear that the pulled-out remaining yarn wraps around the roller and becomes entangled. Therefore, the fear of entanglement with the roller can be further reduced, and the remaining yarn can be reliably removed.
The reliability of the residual yarn removing device can be improved.

Further, the residual yarn removing process is performed by sandwiching the residual yarn between the pair of rollers by the opening / closing means, and by slightly rotating the rollers to pull out the residual yarn. While such a residual yarn removing process is performing a predetermined operation, the bobbin in a state where the residual yarn is wound is rotated accordingly. Therefore, for example, by providing a detecting means for detecting the rotation of the bobbin, by detecting the rotation of the bobbin, the residual yarn is sandwiched between a pair of rollers, the residual yarn removal processing as specified It may be configured to determine whether or not the operation is performed.

In this case, the detecting means is not particularly limited as long as it can detect the rotation of the bobbin which rotates as the remaining yarn is pulled out. For example, a configuration may be adopted in which the detection unit is provided on the bobbin, and the rotation of the bobbin is detected by detecting the detection unit using various sensors. It is preferable to use a non-contact type sensor so as not to suppress the rotation of the bobbin. In this case, the various sensors are not particularly limited, and for example, an optical sensor such as a reflection type photo sensor or a magnetic sensor such as a Hall element or a magnetic sensitive element may be used. It should be noted that the bobbin is provided with a detected portion corresponding to the properties of various sensors.

In this case, the number of sensors used for detecting the rotation of the bobbin can be arbitrarily selected. When the rotation of the bobbin is detected by using a plurality of sensors, for example, even if the detection of one sensor is hindered, the bobbin can be detected by another sensor. Reliability of rotation detection can be improved.

According to a third aspect of the present invention, there is provided a residual yarn removing apparatus.
3. The apparatus for removing residual yarn according to claim 2, further comprising a peeling unit (air nozzle 10) for peeling off the residual yarn from the roller, wherein the control unit performs the peeling when the roller is opened in the operation of opening and closing the roller. It is characterized in that the means is controlled to remove the remaining yarn from the roller.

According to the residual yarn removing device of the third aspect, the same effect as that of the first or second aspect can be obtained. Further, when the roller is opened, the peeling means is controlled to peel off the residual yarn from the roller, so that the yarn end of the residual yarn can be reliably removed without entanglement with the roller or the like. The reliability of removal can be increased.

As a peeling means, when the roller is opened,
The configuration is not particularly limited as long as the remaining yarn can be peeled off from the roller. For example,
When the pair of rollers are open, an air shower that flows downward between the pair of rollers may be formed. In this case, the remaining yarn can be suitably peeled from the roller by the flow of air. Also, a structure is provided in which a mechanism for rotating each roller is provided when the pair of rollers is opened, and the remaining yarn is separated from the roller by idling each roller while the pair of rollers are open. Is also good.

According to a fourth aspect of the present invention, there is provided an apparatus for removing a residual yarn.
In the above-described residual yarn removing device, the peeling unit is a guiding unit (air nozzle 10) that guides the residual yarn between the rollers by air, and the control unit is configured to control a roller in an operation of opening and closing the roller. When opened, control is performed such that air is blown from the guide means to between the rollers.

According to the residual yarn removing device of the fourth aspect, the same effect as that of the third aspect can be obtained, and when the roller is opened in the operation of opening and closing the roller, the guide means uses the air to control the residual yarn. Is guided between the rollers, so that the fear that the yarn end of the remaining yarn is entangled with the rollers or the like can be further reduced. In addition, the end of the remaining yarn can be guided to a predetermined position for removing the remaining yarn, and the reliability of removing the remaining yarn can be further improved.

[0021] The guide means acts to separate the yarn end of the residual yarn from a roller or the like and can generate an air flow so as to guide the yarn end to a predetermined position for removing the residual yarn. If so, there is no particular limitation.

In opening and closing the rollers again, when the pair of rollers is changed from the open state to the closed state, the pair of rollers are closed stepwise while stopping at a predetermined position. Preferably, it is in a state. In this case, the pair of rollers are gradually closed, so that the flow of air generated by the guide means does not disturb the posture of the yarn end and removes the yarn end of the remaining yarn. Can be reliably guided to a predetermined position.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, with reference to FIGS. 1 to 10, a residual yarn removing device 1 according to an embodiment of the present invention will be described in detail. The residual thread removing device 1 of the present embodiment is a
And a part of an automatic lower thread supply device that automatically supplies the lower thread when the lower thread is consumed from the bobbin N mounted on the lower thread.

As shown in FIG. 3, the lower thread automatic supply device according to the embodiment of the present invention is disposed below the sewing machine table T and has a rotating arm provided with two bobbin gripping means (not shown). A bobbin exchanging device 20 including
A residual yarn removing device 1 unique to the present embodiment, a lower yarn winding device 122 (shown in FIG. 10) for winding a lower yarn around the bobbin N from which the residual yarn has been removed by the residual yarn removing device 1, Winding device 12
And a thread hooking device (not shown) for setting one end of the lower thread of the bobbin N, on which the lower thread has been newly wound in 2, in the bobbin case M in a predetermined manner. Further, the remaining yarn removing device 1, the lower yarn winding device 122 (shown in FIG. 10), and the yarn hooking device (not shown) are provided with a holding shaft for holding the bobbin N in order to perform each operation. Have been. Then, a bobbin gripping means (not shown) of the rotating arm 21 can sequentially transport the bobbin to a holding shaft which is a working position of each device.

The rotating arm 21 is integrally provided with arm members 22a and 22b extending horizontally from both upper and lower ends, and bobbin gripping means (not shown) is provided at the tip of each arm member 22a and 22b. Have been. The bobbin gripping means (not shown) can grip and release the bobbin case M. Thereby, the rotating arm 21
Is a bobbin case M at the tips of the two arm members 22a and 22b.
Can be grasped. Further, the rotating arm 21 is rotatable around a rotating shaft 24, and
The rotary shaft 24 is arranged so as to be movable in the axial direction. Accordingly, in the bobbin changing device 20, the bobbin gripping means (not shown) grips and removes the bobbin case M from the shuttle K and removes the bobbin N stored in the bobbin case M from the operation of the automatic bobbin thread supply device. To the working position of the remaining yarn removing device 1 and the lower yarn winding device (not shown)
They can be transported sequentially. In addition, the bobbin exchange device 20 has a bobbin gripping means (not shown).
Are provided and two bobbins can be handled at a time, so that the remaining thread of one bobbin N is removed and the bobbin thread is wound, and at the same time, the other bobbin is returned to the shuttle K for sewing. It is possible to continue.

As shown in FIGS. 3 and 4, the residual yarn removing device 1 includes a driving roller 33 (roller) that is driven to rotate by the power of a residual yarn winding motor 34 (shown in FIG. 10), The driven roller 3 rotates in a state where the driving roller 3
3, a driven roller 48 (roller) that pulls out the remaining yarn from the contact portion in cooperation with the roller 3, and a roller opening / closing unit A that moves the driven roller 48 to sandwich the yarn end side of the remaining yarn between the driving roller 33 and An air nozzle 10 (separating means, guiding means) for generating an air shower and guiding the remaining yarn end Mb between the driving roller 33 and the driven roller 48, and a suction nozzle for sucking and collecting the drawn residual yarn by air. 11, a dust bag 11c for storing the removed residual yarn, a bobbin rotation detecting means 50 (shown in FIG. 6) for detecting the rotation of the bobbin N using two sensors 50a and 50b, and a residual yarn processing. The remaining yarn removing device control means 60 (control means, FIG. 1) which performs various calculations and determinations and controls the remaining yarn removing device 1.
0) and the like. And
An air shower generated by the air nozzle 10 guides the yarn end of the remaining yarn between the driving roller 33 and the driven roller 48, pulls out the remaining yarn between the driving roller 33 and the driven roller 48, and draws the remaining yarn. By collecting the residual yarn by air suction, the residual yarn remaining on the bobbin N can be removed.

As shown in FIG. 3, the rotating shaft 24 rotatably supports the rotating arm 21 and
Is rotatably supported by the base plate 30.
The base plate 30 is provided with a residual yarn removing shaft 35, a bobbin case locking member 36, and sensors 50a and 50b. The residual yarn removing shaft 35 is a shaft that holds the bobbin case M, and is a working position of the residual yarn removing device 1. The bobbin case locking member 36 has a groove 36a.
(Shown in FIG. 7), and a latch arm Ma provided so as to protrude from the bobbin case M with the groove 36a.
(Shown in FIG. 7) is locked to prevent the bobbin case M from rotating. Thereby, the bobbin case M for removing the residual yarn
The bobbin case M does not rotate, and only the bobbin N housed therein can be held in a rotatable state.

The driving roller 33 is fixed to the base end of the rotating shaft 32 as shown in FIG. The rotation shaft 32 is rotatably supported so as to penetrate the base plate 30, and a driving roller 33 is fixed to a shaft portion protruding from the near side of the base plate 30. The rotating shaft 32 is driven by the power of a remaining yarn winding motor 34 (shown in FIG. 10) being transmitted. Therefore, the power from the residual yarn winding motor 34 is transmitted to the driving roller 33 via the rotating shaft 32, and the driving roller 33 is driven to rotate.

A substantially U-shaped remaining thread bracket 31 is provided below the base plate 30. On the back side of the side plate 31a of the remaining thread bracket 31, a U-shaped rotating arm 4 is provided.
5 are arranged. A rotating shaft 47 is rotatably supported on both side plates 45a and 45b forming the U-shape of the rotating arm 45. The rotating shaft 47 is attached to the front side plate 45.
A driven roller 48 is fixed to a shaft portion that penetrates a and projects forward. Also, the side plate 4 on the back side of the rotary arm 45.
From the left side to the right side in FIG. 3 from FIG. 5b, a cup-shaped friction clutch plate 44 having an open end directed toward the back, a clutch press-contact spring 43, a cup-shaped storage section 42 having an open end directed toward the near side, and the storage section A rotary arm drive gear 41 having an end fixed at 42 is arranged in order. The rotary arm transmission gear 40 is meshed with the rotary arm drive gear 41.

Further, a shaft 46 is provided below the rotating arm 45.
Are fixedly provided to the rotating arm 45. The shaft 46
Is rotatably supported by a side plate 31a of the remaining thread bracket 31, and a rear side of the shaft 46 is a friction clutch plate 44, a clutch press-contact spring 43, a storage section 42, a rotating arm drive gear 41. , So that it is rotatably supported. The clutch press-contact spring 43 includes a friction clutch plate 44.
Between the friction clutch plate 44 and the storage portion 42 by a plurality of pins (not shown) fixed between the friction clutch plate 44 and the storage portion 42. Is regulated. Then, by the pressing force of the clutch pressing spring 43, the side plate 45 on the back side of the rotary arm 45.
b and the friction clutch plate 44 are in pressure contact with each other.

The power from the residual yarn winding motor 34 (shown in FIG. 10) is transmitted to the rotary shaft 32 fixed to the end of the driving roller 33, and the rotary arm transmission gear 40 It is also transmitted to. And
Rotational driving force is transmitted to a rotation arm drive gear 41 that meshes with the rotation arm transmission gear 40, and the rotation drive force is transmitted to the rotation arm 45 via the housing 42, the clutch press-contact spring 43, and the friction clutch plate 44. Is done. The rotating arm 45 can rotate around the shaft 46 as a fulcrum. As described above, when the rotating arm 45 rotates, the driven roller 48 pivotally supported by the rotating arm 45 also rotates, and the driven roller 48 is separated from the driving roller 33. Therefore, the remaining yarn take-up motor 34, the rotary arm transmission gear 40, the rotary arm drive gear 41, the storage section 42, the clutch pressure spring 43, and the friction clutch plate 4
The roller 4 and the rotating arm 45 constitute roller opening / closing means A for opening and closing the drive roller 33 and the driven roller 48.

The rotating arm 45 and the driven roller 48
The side plate 31a is formed with a notch or the like so that the rotation shaft 47 for fixing the driven roller 48 does not hit the front side plate 31a of the remaining yarn bracket 31 when the shaft rotates about the shaft 46 as a fulcrum. .

In the present embodiment, the drive roller 33 and the driven roller 48 have substantially the same roller circumferential length, which is longer than the length of the yarn pulled out when the bobbin N makes one rotation. I have. Therefore, the driving roller 33
When the drive roller 33 is rotated with the remaining yarn sandwiched between the driven yarn and the driven roller 48, for example, when the remaining yarn only for one rotation of the bobbin N is drawn, the drawn remaining yarn is not removed. By making one round of the roller, there is no fear of sticking.

The bobbin rotation detecting means 50 is configured to detect the rotation of the bobbin N. By detecting the rotation of the bobbin N, the remaining yarn is interposed between the driving roller 33 and the driven roller 48. Can be detected.
The output of the bobbin rotation detecting means 50 is input to the residual yarn removing device control means 60 (shown in FIG. 10). The residual yarn removing device 1 is controlled based on the output.

As shown in FIG. 6, the bobbin rotation detecting means 50 includes two sensors 50a and 50b,
Waveform shaping units 51a and 51b for shaping the signal waveforms output from 0a and 50b, and a bobbin rotation / non-rotation determination unit 52
And the like. The sensors 50a and 50b are
For example, it is composed of a reflection type photo sensor or the like,
5 is provided at a position facing the flange surface of the bobbin N held at 5, respectively. Specifically, these sensors 50
The a and 50b are attached at positions where the tips thereof are slightly sunk inside the base plate 30. Further, these sensors 50a and 50b are located at positions where clutch holes Na and Nb (shown in FIG. 6) on the flange surface as detected parts can be detected.
In addition, the two sensors 50a and 50b are attached at positions shifted by, for example, 90 degrees in the rotation angle direction of the bobbin N so that the sensors 50a and 50b do not simultaneously detect the edges of either of the clutch holes Na and Nb.

The bobbin rotation / non-rotation determination unit 52 is composed of, for example, an asynchronous RS flip-flop, and outputs an “ON” signal when an “ON” signal is input from one of the sensors 50a. When an ON signal is input from the sensor 50b, the "ON" signal is switched to "OFF". This action allows both sensors 50
When the pulse signals are sequentially and intermittently inputted from a and 50b, a pulse signal of “ON / OFF” is outputted from the bobbin rotation / non-rotation determination unit 52, while one of the sensors 50
When a pulse signal is input only from a (50b), a pulse signal is not output from the bobbin rotation / non-rotation determination unit 52, and an "ON" or "OFF" signal is continuously output. Has become.

By the way, as described above, the residual thread removal processing is usually performed after the return of the sewing operation. Therefore, the bobbin rotation detecting means 50 operates while receiving a certain amount of vibration due to the sewing operation. In this case, if the detection points of the sensors 50a and 50b are opposed to the edges of the clutch holes Na and Nb of the bobbin that has stopped after the residual yarn removing process has been stopped, the clutch holes Na and
When the edge of Nb and the sensors 50a and 50b are finely displaced relative to each other, the bobbin rotation detecting unit 50 may not be able to perform accurate detection. However, as described above, the sensors 50a and 50b are mounted on the same base plate 30 together with the residual yarn removing shaft 35 holding the bobbin case M.
Since it is provided on the upper side (shown in FIG. 3), even when the residual thread removing shaft 35 vibrates due to, for example, sewing of the sewing machine, the same vibration is applied to the sensors 50a and 50b. That is, both vibrations are relatively canceled, and the sensor 50
The bobbin M viewed from a and 50b can be in a stable state. Therefore, the problem that the detection outputs of the sensors 50a and 50b due to the vibration are unstablely broken and a signal similar to that at the time of bobbin rotation is output is less likely to occur.

The base plate 30 around the residual yarn removing shaft 35
Locks the bobbin M from the side (shown in FIG. 3), so that the bobbin M does not move along the rotation axis direction, and the instability of bobbin rotation detection due to this movement can be eliminated. Therefore, it is possible to more stably detect the rotation of the bobbin. As described above, the unstable factor due to the vibration is avoided, and the end of the residual yarn removing process can be accurately detected.

The bobbin rotation detecting means 50 includes
A pair of sensors 50a, 50b (reflective photo sensor)
Although the configuration is such that the pair of clutch holes Na and Nb of the bobbin N are detected, the present invention is not limited to this configuration. For example, another optical sensor may be used in place of the reflection type photo sensor, and two magnets are provided on the bobbin flange surface in place of the clutch holes Na and Nb, and the sensors 50a and 50b are provided.
Instead of 0b (reflection type photo sensor), other non-contact detecting means such as a Hall element or a magnetic sensitive element may be provided.

As described above, the bobbin rotation detecting means 50
While the remaining yarn is being pulled out, the rotation of the bobbin N is detected, and the following signal is output to the remaining yarn removing device control means 60 as shown in FIGS. In FIG. 8, "(a) sensor signal" is a signal from the sensor 50a via the waveform shaping unit 51a.
The output signal of “(b) sensor signal” is
The output signal of the sensor 50b via “1b”, “(c) output signal” is an output signal of the bobbin rotation / non-rotation determination unit 52.

As shown by the timing of "remaining yarn removal" in FIG. 8, the two sensors 50a and 50b face the clutch holes Na and Nb of the bobbin N at different rotation angles (ie, at different timings). At this time, a high-level voltage output signal is generated, and when the sensors 50a and 50b face the flange surface, a low-level voltage output signal is generated. The bobbin rotation / non-rotation determination unit 52 receives the above signals and outputs a pulse signal having the same cycle as these signals.

When the rotation of the bobbin N stops, usually, 2
The output signals from the sensors 50a and 50b do not change, and the output signals from the bobbin rotation / non-rotation determination unit 52 do not change (for example, FIG. 8B). However, FIG.
As shown after the “Remaining thread removal end” timing,
Either of the sensors 50a and 50b (in FIG.
When a) comes to the edge of the clutch hole Na and the bobbin N stops, an unstable signal due to a signal crack is output from the corresponding sensor 50a (50b) with the vibration of the sewing operation or the like (for example, FIG. 8A). However, also in this case, as shown in FIG.
Is facing the bobbin flange surface, so the bobbin rotation /
The output signal from the non-rotation determination unit 52 is stabilized (see FIG. 8).
(C)).

As a result, as shown in FIG. 9, a pulse signal is output from the bobbin rotation / non-rotation judging section 52 from the start to the end of the residual yarn removal processing, and after the bobbin N stops, the pulse signal is output. Cut off. In addition, since the thread winding diameter becomes smaller in accordance with the removal of the remaining yarn, the rotation cycle of the bobbin N gradually narrows from the start to the end of the removal of the remaining yarn.
Then, in synchronization with this rotation cycle, the cycle T of the pulse signal output from the bobbin rotation / non-rotation determination unit 52 also narrows.

Also, the frequency f (= 1 / T) of the pulse signal
Indicates a substantially predetermined change that when the residual yarn removal processing is performed normally, the amount gradually increases from the start to the end of the residual yarn removal. Immediately before the end of the residual yarn removal processing, the maximum frequency fmax is predicted in advance based on the diameter of the bobbin shaft.
The maximum frequency fmax is stored in the RAM 140 (shown in FIG. 10), and is used as a criterion when the remaining yarn removing device control means 60 determines whether or not the remaining yarn removal has been completed normally.

In the course of the remaining yarn removing process, if the bobbin N stops without pulling out the remaining yarn due to the yarn getting stuck in the bobbin N or a rare knot of the yarn, or
If the bobbin N stops because the remaining yarn breaks during the withdrawal of the remaining yarn, the remaining yarn removing device control means 60 determines that the frequency of the pulse signal has stopped without reaching the maximum frequency fmax. It is determined that the residual yarn removal processing has been abnormally terminated.

Hereinafter, a control system of the lower thread automatic supply device control means 100 will be described with reference to FIG. As shown in FIG. 10, the residual yarn removing device control means 60 constitutes a part of the lower yarn automatic supply device control means 100. Bobbin changing device 11
2, a driver 111 is connected to the lower thread winding device 122, and a driver 121 is connected to the lower thread winding device 122, respectively. The residual yarn removing device 1 includes a driver 61a for the residual yarn winding motor 34,
Driver 61b for driving roller 33, driver 61c for voltage proportional valve 62c controlling air nozzle 10, driver 61d for voltage proportional valve 62d controlling suction nozzle 11
And are respectively connected. These drivers 11
1, 121, 61a, 61b, 61c, 61d are connected to a lower thread automatic supply device control means (CPU (Central Processing Unit) 100) via an I / O port (not shown). The yarn automatic supply device control means 100 includes a ROM (Read Only Memory) 130.
From the RAM, and the RAM (Random Access Memor
y) It is connected so that a signal may be input to and output from 140. Then, the remaining yarn removing device 1 and the bobbin replacing device 1
The lower yarn winding device 122 and the lower yarn winding device 122 are configured to perform a predetermined operation while being controlled by the lower yarn automatic supply device control means 100.

The bobbin automatic feeding device control means 100 comprises a bobbin exchanging device control means 110, a bobbin winding device control means 120, and a residual yarn removing device control means 60. The drive of the exchanging device 112 is controlled to perform a predetermined operation required for bobbin exchange, and the drive of the bobbin winding device 122 is controlled by the bobbin winding device control means 120 to perform the predetermined operation required for bobbin winding. Then, the drive of the residual yarn removing device 1 is controlled by the residual yarn removing device control means 60, and a predetermined operation necessary for removing the residual yarn is executed.

The outputs of the sensors 50a and 50b (shown in FIGS. 6 and 7) of the bobbin rotation detecting means 50 are input to the residual yarn removing device controlling means 60. , RAM 140 and ROM 130
It has a function of detecting the frequency of rotation of the bobbin N and determining whether or not the residual yarn removal processing has been completed normally.

The frequency of the rotation of the bobbin N is detected by, for example,
A pulse signal is input from the bobbin rotation detecting means 50, and the rotation frequency of the bobbin N can be detected by calculating the rotation frequency of the bobbin N from the output time interval of the pulse signal based on the internal clock.
The determination as to whether or not the residual thread removal processing has been completed normally is made by determining whether or not the rotation frequency of the bobbin N has reached the maximum frequency fmax (described above) when the bobbin stops. be able to. That is, the residual yarn removing device control means 60 monitors the output from the bobbin rotation detecting means 50, and determines that residual yarn is being removed when a continuous pulse wave is output from the bobbin rotation detecting means 50. When the output of the pulse wave stops, it is determined that the removal of the residual yarn has been completed, and the drive stop signal is sent to the driver 61a.

The residual yarn removing device control means 60 includes a residual yarn winding motor 34, a driving roller 33, and an air nozzle 10.
The drivers 61a, 61b, 61c, and 61d are arranged so that the suction nozzle 11 and the like perform a predetermined residual yarn removal process.
It has a function of transmitting an operation command signal to the like.

An operation switch 201 for the operator to operate the automatic lower thread supply device and a display of the abnormality when the residual thread removal processing is abnormal are output to the lower thread automatic supply device control means 100. Display means 20 for
2 and an operation panel 200 having the same.

Next, the operation of the automatic lower thread supply device including the residual yarn removing device 1 according to the embodiment of the present invention will be described with reference to the flowcharts of FIGS. First, a series of operations performed by the automatic lower thread supply device will be described with reference to a flowchart of the lower thread automatic supply process in FIG. First, when the bobbin thread is consumed during sewing and the bobbin N becomes small, the bobbin thread automatic supply process is started based on, for example, a switch operation (not shown) by an operator.
(Steps J1, J2)

When the automatic lower thread supply process is started, the driving of the sewing machine is prohibited (step J3), and the rotating arm 21 is turned off.
The bobbin case M is taken out of the shuttle K and gripped by the one bobbin gripping means by the rotation of and the movement of the bobbin gripping means along the rotary shaft 24 and the one bobbin gripping means (step). J4). And the rotating arm 2
The bobbin case M taken out of the shuttle K is conveyed to the residual yarn removing shaft 35 which is the working position of the residual yarn removing device 1 by the rotation of the rotary shaft 1 and the movement in the direction opposite to the shuttle along the rotation shaft 24, and It is released from the gripping means and set on the remaining yarn removing shaft 35 (step J5). Here, the latch arm Ma of the bobbin case M is locked by the groove 36a of the bobbin case locking member 36, and the rotation of the bobbin case M is stopped. On the other hand, the bobbin case gripped by the other bobbin gripping means (the lower thread is wound in advance)
Is returned to the shuttle K (step J6), and the operator is notified that the lower thread has been replenished (step J7). In this state, the movement of the sewing machine is permitted, the process returns to step 1, and the operator continues the sewing operation again. In parallel with this, the process proceeds to step J8 to perform the subsequent processes.

Then, in this state, the remaining yarn removing process is executed. (Step J8) When the residual yarn removing process is completed, the bobbin from which the residual yarn has been removed is again rotated by the rotation of the rotary arm 21 and the movement in the shuttle direction along the rotary shaft 24, and the gripping operation of the bobbin gripper. The case M is detached from the residual yarn removing shaft 35, and then is conveyed to the lower yarn winding position. (Step J9) Then, in a state where the bobbin case M is gripped by the gripping means at the lower thread winding position, the lower thread winding process is started by the lower thread winding device 122 (not shown in FIG. 10) (step J10). . That is, a predetermined amount of bobbin thread is wound around the bobbin N, and thereafter, one end side of the bobbin thread is set in a bobbin case M in a predetermined mode by a thread hooking means (not shown), and the bobbin thread at one end side is cut. You. Next, a standby state is set (step J11), and the next bobbin replacement instruction is awaited. Thus, the lower thread automatic supply process is completed.

Next, the operation of the lower thread removing process shown in step J8 in FIG. 2 will be described with reference to the flowchart of the remaining thread removing process of FIG. First, FIG.
As shown in (a), the driving roller 33 and the driven roller 48
5 is driven in the CCW direction in FIG. 5 to drive the drive roller 33 and the rotary arm transmission gear 40 (shown in FIG. 3) in the same direction. Rotate. When the rotary arm transmission gear 40 is driven to rotate, the rotary arm drive gear 41 meshing with the rotary arm transmission gear 40 is driven to rotate while reversing the rotation direction. Then, the rotational driving force is frictionally transmitted to the rotating arm 45 via the storage section 42, the clutch press-contact spring 43, and the friction clutch plate 44, and the rotating arm 45 uses
Rotate 90 degrees in the W direction. Thus, as shown in FIG. 5B, the driven roller 48 is opened with respect to the driving roller 33, and a space is provided between the driving roller 33 and the driven roller 48 (step S1).

Next, an air shower for blowing the residual yarn is blown from the air nozzle 10 to guide the residual yarn end Mb hanging from the bobbin case M to the working position as shown in FIG. 5B (step S2). ). Then, FIG.
As shown in (b), the lower thread is sucked by the suction nozzle 11 (step S3).

Next, the remaining yarn winding motor 34 is driven in the CW direction in FIG. 5 to rotate the driving roller 33 and the rotary arm transmission gear 40 (shown in FIG. 3) in the same direction (the lower yarn discharging rotation direction). . The rotation of the rotation arm transmission gear 40 causes the rotation of the rotation arm drive gear 41 to rotate in the opposite direction. The rotation driving force is applied to the storage unit 4.
2. Friction is transmitted to the rotary arm 45 via the clutch press-contact spring 43 and the friction clutch plate 44, and the rotary arm 45 rotates in the CCW direction around the shaft 46 as a fulcrum, and the driven roller 48
To the drive roller 33 side. Then, when the rotating arm 45 is closed from the above 90 ° to 45 °, the driving of the remaining yarn winding motor 34 is stopped (step S4).

Next, the driving of the residual yarn winding motor 34 is restarted, and the driving of the residual yarn winding motor 34 is stopped when the rotating arm 45 is further closed by 30 ° from the above angle (step S5).

Next, the driving of the residual yarn winding motor 34 is restarted, and the driving of the residual yarn winding motor 34 is stopped when the rotary arm 45 is further closed by 15 ° from the above angle. At this time, as shown in FIG. 5C, the driven roller 48 comes into contact with the drive roller 33, and the remaining yarn end Mb is sandwiched between these rollers 48, 33 (step S6). As described above, when the driven roller 48 and the driving roller 33 guide the remaining yarn end Mb by the air nozzle 10 from the open state to the closed state, the remaining yarn end Mb is driven. It can be pinched between the roller 33 and the driven roller 48.
In addition, as described above, the degree of closing of the driven roller 48 is intermittent, and the amount of movement for each intermittent movement is reduced from large to small, so that the air nozzle 10 that blows the remaining yarn end Mb to the working position can be used. The turbulence of the air flow and the suction air flow by the suction nozzle 11 is greatly reduced, and the remaining yarn can be reliably held between the driving roller 33 and the driven roller 48.

Next, in step 7, the remaining yarn winding motor 34 is driven in the CW direction to
Is driven to rotate and the remaining yarn is pulled out in cooperation with the driven roller 48. At this time, the bobbin N is rotated by pulling out the remaining yarn. After the remaining yarn winding motor 34 is driven so that the rotation amount of the bobbin becomes 1/2 rotation amount, the driving of the remaining yarn winding motor 34 is performed. It stops (step S7). As described above, when the remaining yarn winding motor 34 is driven, the driven roller 48 is pressed against the driving roller 33 and the rotating arm 4 is driven.
5 cannot rotate in the CCW direction with the fulcrum 46 as a fulcrum, and slippage occurs between the friction clutch plate 44 and the rear side plate 45b of the rotary arm 45, and no further pressing force is applied. The drive roller 33 continues to rotate in the CW direction as it is in a state (a state in which the pressing force is maintained). Therefore, the bobbin thread clamped between the driving roller 33 and the driven roller 48 gradually flows downstream while being caught between the driving roller 33 and the driven roller 48 by the intermittent cooperative rotation of the driving roller 33 and the driven roller 48. Is discharged. Next, in the same manner as in step S7, the remaining yarn winding motor 34
Is driven in the CW direction by a ボ bobbin rotation amount and then stopped (step S8).

Next, it is determined whether or not the remaining yarn of the bobbin N has been removed (step S9). This is because when the remaining yarn is discharged downstream (remaining yarn is removed) while being caught by the driving roller 33 and the driven roller 48 by the cooperative rotation of the driving roller 33 and the driven roller 48. Is rotated, and the bobbin N does not rotate unless it has been discharged (the remaining yarn has not been removed). The presence or absence of this rotation is determined by the output signals from the sensors 50a and 50b (described above).

As described above, when the drive yarn 33 and the driven roller 48 are intermittently rotated as in steps S7 to S8 at the beginning of the winding and discharging of the remaining yarn, it is possible to reduce the line irregularity and move the remaining yarn in the predetermined direction. (The direction in which the remaining yarn is discharged by the driving roller 33 and the driven roller 48; the direction toward the suction nozzle 11), and the fear of entanglement between the driving roller 33, the driven roller 48, and other members can be reduced. Also, at this time, when the remaining yarn is sucked by the suction nozzle 11, the discharged remaining yarn end Mb does not become entangled with the driving roller 33, the driven roller 48, and other members, and is surely transferred to the suction nozzle 11. I can guide you.

If it is determined that the bobbin N is not rotating, that is, if the remaining yarn has not been removed, the retry operation is performed a specified number of times (the specified number of times of the yarn end preventing operation in step S10 (described later). ) Is determined (step S20). Here, in the present embodiment, the prescribed number of times is three, and if less than three, the process returns to step S1.

On the other hand, if the retry operation is performed three times in step S20, the blowing of the air shower from the air nozzle 10 is stopped (step S21), and the lower thread suction of the suction nozzle 11 is stopped (step S20). S2
2) Assuming that any failure that cannot remove the residual yarn has occurred, an error display is performed on the error display window (step S23), and the process prompts the intervention of the operator and returns.

If it is determined in step S9 that the bobbin N is rotating, that is, the remaining yarn is being removed, it is determined whether the series of operations in steps S1 to S9 has been performed a specified number of times. (Step S10).
If the series of operations in steps S1 to S9 does not reach the specified number of times, the process returns to step S1 and returns to steps S1 to S9.
9 is repeated until the specified number of operations is reached. In this way, the operation of steps S1 to S9 is repeated a plurality of times in step S10, so that the driving roller 33 and the driven roller 4
By controlling the opening and closing operations of the yarn 8 repeatedly, it is possible to reliably prevent the yarn ends from tangling with a wide variety of yarns. That is, in the operation up to step S9, even if the thread end of the lower thread has adhered due to minute scratches or static electricity on the surfaces of the driving roller 33 and the driven roller 48 and other members, the driving roller 33 And the driven roller 48 are opened and closed again, and the air nozzle 10
By using the suction nozzle 11 and the suction nozzle 11 together, the yarn end can be reliably separated, and the posture for allowing the remaining yarn to be smoothly drawn out to the driving roller 33 and the driven roller 48 by air can be secured. In step S10, the specified number of the series of operations in steps S1 to S9 is a preset value, but if the number is too large, the processing cycle of the remaining yarn removing process is delayed. It is preferable to set the minimum value. For example, in the present embodiment, the specified number of times of step S10 is three.

Next, in step S10, steps S1 to S1 are executed.
If it is determined that the operation up to S9 has been repeated the specified number of times,
The remaining yarn winding motor 34 is driven at a low speed (step S1).
1). Next, it is determined whether or not the bobbin N has been driven by one rotation (step S12). If the bobbin N has not been driven by one rotation, the same determination is repeated until the bobbin N is driven by one rotation. If the bobbin N has been driven one rotation, the remaining yarn winding motor 34 is driven at a medium speed (step S13), and it is determined whether the bobbin N has been driven one rotation (step S14). If not, the same determination is repeated until the motor is driven by one rotation. When the drive is performed for one rotation, the remaining yarn winding motor 34 is driven at a high speed (step S15).

As described above, when the rotational speed is controlled stepwise so that the rotational speed becomes low at first and then becomes high, it is possible to prevent the thread from being violated as compared with the case where the rotational speed is driven at a constant and high speed. The fear of entanglement with the rollers 48 and other members is further reduced. Further, the discharge time can be shortened as compared with the case where the rotation speed is driven at a constant and low speed.

Next, it is determined whether or not the bobbin N has stopped (step S16). If it is determined that the bobbin N has not stopped and the removal of the remaining yarn has been continued, the bobbin N is stopped until the bobbin N stops. When the same determination is repeated and it is determined that the bobbin N has stopped and the removal of the remaining yarn has been completed, the process proceeds to step S
17, but at this time, the driving roller 33 and the driven roller 4
The removal of the residual yarn discharged by the suction nozzle 8 and sucked by the suction nozzle 11 is performed by suction air through the suction nozzle 11, the air tube 11a, and the yarn suction device 11b.
1c and stored in the dust bag 11c.

Next, the blowing of the air shower from the air nozzle 10 is stopped (step S17), the suction of the residual yarn by the suction nozzle 11 is stopped (step S18), and the residual yarn winding motor 34 is stopped (step S19). Then, the rotation of the driving roller 33 is stopped, and the process returns. As described above, the operation of the lower thread removing process shown in step J8 in FIG. 2 is performed.

According to the residual yarn removing device 1 of the embodiment of the present invention, steps S1 to S9 shown in FIG.
The operation of preventing the yarn ends from being entangled is performed a specified number of times (for example, three times in the present embodiment), and the drive roller 33 and the driven roller 48 are opened and closed the specified number of times.
By controlling the yarn end of the remaining yarn to be pulled out, the yarn end of the remaining yarn is reliably separated, and the remaining yarn can be reliably removed without entanglement with the driving roller 33, the driven roller 48, and the like.

In steps S7 and S8 in FIG. 1, the remaining yarn is drawn out by one turn of the bobbin. However, the circumferential length of the driving roller 33 and the driven roller 48 is determined by the length of the remaining yarn drawn out by one turn of the bobbin. Since the length is longer than the length, the remaining yarn pulled out is
There is no fear of getting entangled as if you go around 8 once. Therefore,
Further, the reliability of the residual yarn removing device 1 can be improved.

During the operation for preventing the roller from being entangled in steps S2 to S9, the air nozzle 10
The yarn guide air from the drive roller 33
And the driven roller 48 can be guided. Therefore, it is possible to further reduce the fear that the yarn end of the remaining yarn is entangled with the driving roller 33, the driven roller 48, and the like, and to further enhance the reliability of the remaining yarn removing device 1.

The present invention is not limited to the above embodiment. For example, the bobbin rotation detecting means 50,
The remaining yarn removing device control means 60, the lower yarn automatic supply device control means 100, and the like are not limited to the configuration shown in the present embodiment, and can be configured with various logic circuits. In addition, the detailed configuration and method specifically shown are:
Needless to say, it can be appropriately changed without departing from the spirit of the present invention.

[0074]

According to the residual yarn removing device of the first aspect,
By controlling the opening and closing operation of the roller again at least once, the yarn end of the remaining yarn acts so as to be separated, so that the yarn end of the remaining yarn does not become entangled with the roller, etc. Yarn can be removed. Therefore, it is possible to reliably remove the residual yarn from yarns having a wide range of properties, and it is possible to greatly improve the reliability of the residual yarn removing device.

According to the residual yarn removing device of the second aspect, the same effect as that of the first aspect can be obtained, and the length of the residual yarn pulled out by one operation by the rotation of the roller is reduced by the roller. Is shorter than the circumferential length of the roller, there is no fear that the drawn residual yarn is entangled with the roller so as to make one round.
Therefore, the reliability of the remaining yarn removing device can be further improved.

According to the residual yarn removing device of the third aspect, the same effect as in the first or second aspect can be obtained, and the peeling means is controlled so as to peel the residual yarn from the roller. The remaining yarn can be reliably removed without the yarn end of the yarn being entangled with a roller or the like, and the reliability of removing the remaining yarn can be improved.

According to the fourth aspect of the present invention, the same effect as in the third aspect can be obtained, and the guide means guides the residual yarn between the rollers by air while the roller is opened and closed again. Therefore, the fear that the yarn end of the remaining yarn is entangled with the roller or the like can be further reduced, and the reliability of the remaining yarn removing device can be further improved. .

[Brief description of the drawings]

FIG. 1 is a flowchart showing a process of an automatic lower thread supply device including a residual yarn removing device 1 according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a residual yarn removing process of the residual yarn removing device 1 according to one embodiment to which the present invention is applied.

FIG. 3 is a side view of the residual yarn removing device 1 according to one embodiment to which the present invention is applied.

FIG. 4 is a schematic front view of the residual yarn removing device 1 of FIG.

FIG. 5 is a front view showing the operation of the residual yarn removing device 1 of FIG.

FIG. 6 is a block diagram showing a configuration of the bobbin rotation detecting means 50.

FIG. 7 is a perspective view of a main part in which a configuration of a bobbin rotation detecting unit 50 is extracted from the residual yarn removing device 1 of FIG.

FIG. 8 is an example of a time chart of an output signal output from each unit of the bobbin rotation detecting means 50 during the process of removing the residual yarn.

FIG. 9 is an example of a time chart of a signal output from the bobbin rotation / non-rotation determination unit 52 from the start to the end of the residual yarn removing process.

FIG. 10 is a block diagram showing a control system of the lower thread automatic supply device including the residual yarn removing device 1 of the present embodiment.

[Explanation of symbols]

 A Roller opening / closing means N Bobbin 10 Air nozzle (peeling means, guiding means) 33 Drive roller (roller) 34 Residual yarn winding motor (part of roller opening / closing means A) 45 Rotary arm (part of roller opening / closing means A) 48 Follower roller (Roller) 50 Bobbin rotation detecting means (Detecting means) 60 Residual yarn removing device controlling means (Control means)

Claims (4)

[Claims] 1. A pair of rollers for drawing out the remaining yarn from the bobbin by rotating the yarn end side of the remaining yarn wound on a rotatable bobbin, and introducing the remaining yarn between the rollers. Roller opening / closing means for opening and closing the rollers so as to open the rollers and to close the rollers so as to sandwich the residual yarn introduced between the rollers. In the yarn removing device, after opening and closing the roller by the roller opening / closing means to introduce and pinch the remaining yarn between the rollers, rotating the roller at least once or more to pull out the remaining yarn and the roller And a control means for controlling the opening and closing of the thread. 2. The residual yarn according to claim 1, wherein a length of pulling out the residual yarn in one operation of rotating the roller and extracting the residual yarn is shorter than a circumferential length of the roller. Removal device. 3. A peeling means for peeling off the residual yarn from the roller, wherein the control means controls the peeling means when the roller is opened in the operation of opening and closing the roller to control the residual yarn from the roller. The residual yarn removing device according to claim 1, wherein the residual yarn is removed. 4. The peeling means is a guiding means for guiding the remaining yarn between the rollers by air, and the control means is configured to control the guide when the roller is opened in the operation of opening and closing the roller. 4. The residual yarn removing device according to claim 3, wherein control is performed such that air is blown from between the means and between the rollers.