JPH11144613A - Filament discontinuity detector and filament stringing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically and surely detect discontinuity of a filament caused when a filament stringing device is operating. SOLUTION: A motor 32 which gives a power for rotating in the direction opposite to the supply direction of filaments F is attached to a filament drum 30 around which filaments F are wound to be held. The rotation of the motor 32 is detected by a rotation detector 33. The output of the rotation detector 33 is given to a rotary direction discriminator 34 to detect the rotary directon of the motor 32 and the filament drum 30. The presence of discontinuity of the filaments F is judged based on the detection result.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically detecting a break in a filament which occurs during a filament stretching operation in a light emitting element of a fluorescent display tube, and to a filament stretching device provided with the device.

[0002]

2. Description of the Related Art A light emitting element of a fluorescent display tube comprises a plurality of filaments intersecting between a plurality of electrodes formed at a predetermined interval on one surface of a rectangular support plate. It is configured to be installed while maintaining a predetermined tension. The filament is made of a hard and brittle metal such as tungsten, and is a thin wire having a diameter of about 0.02 mm.Since it is difficult to handle the filament, the work of stretching the filament is performed manually. This is one of the factors that hinders a reduction in the product cost of the fluorescent display tube.

[0003] Conventionally, to solve such a problem,
Attempts have been made to develop a device for automating the filament stretching operation, and a filament stretching device configured as shown in FIG. 19 has been put to practical use.

In this apparatus, a mounting table 2 of a support plate 1 (see FIG. 20) and a filament drum 3 for winding and holding a linear filament F are mounted on a common base 4.
The welding head 5 as a means for welding filaments is arranged facing the upper part of the placing table 2 while being spaced apart by an appropriate length in the longitudinal direction, and the filament F held by the filament drum 3 is gripped. The pickup 6 to be pulled out is provided so as to be movable on a guide rail 6a erected along the longitudinal direction on the upper surface of the base 4 including the space between the filament drum 3 and the mounting table 2. .

[0005] A plurality (four in the figure) of filament filaments 3 are provided corresponding to the number of filaments F provided on the support plate 1. A guide roller 3a is provided between the filament drum 3 and the pickup 6 for guiding the filament F held on each filament drum 3, and the pickup 6 grips the filament F held on each filament drum 3. Are provided.

[0006] The pickup 6 grasps the filaments F pulled out from each filament drum 3 and guided separately by the guide rollers 3a.
, Each filament F is pulled out while maintaining a predetermined tension between the filament F and the guide roller 3a, and the filament F is laid over the mounting table 2. FIG. 19 shows this state.

FIG. 20 is an explanatory view of a procedure for welding the filament F to the support plate 1 placed on the mounting table 2. In FIG. A plurality of (four in the figure) stretched filaments F are indicated by alternate long and short dash lines.

The support plate 1 mounted on the mounting table 2 is a rectangular metal flat plate having a thickness of about 0.25 mm, and is long in the width direction arranged at predetermined intervals in the longitudinal direction as shown in the figure. Multiple electrodes isolated from each other by rectangular holes
1a, 1a... Are aligned on the mounting table 2 so that the filaments F stretched as described above are positioned so as to intersect with the electrodes 1a, 1a. I have. These filaments F are welded to the electrodes 1a of the support plate 1 by operating the welding head 5 above the mounting table 2 in this state. At the time of this welding, the position of the electrodes 1a, 1a,... Is adjusted below the welding head 5 by moving the mounting table 2, and the welding head 5 is moved in the width direction so as to match the stretched position of each filament F. Will be

At this time, since there is a possibility that the filament F, which is a small diameter wire rod, may be melted by the heat input from the welding head 5, each welding position is called a tab 7, as shown in FIG. The heat input is absorbed by the tub 7 so as to prevent the filament F from being blown by covering the crossing position of the filament F with the tub 7 and welding the pressurized portion. I have to.

[0010]

The conventional filament stretching apparatus configured as described above can automatically stretch the filament F. However, the conventional filament stretching apparatus is provided on the support plate 1 as described above. Fusing of the filament F caused by welding to the electrodes 1a, 1a... Cannot be completely prevented even if the tab 7 is used as described above, and there is a problem that the filament F is broken. .

As described above, since the filament F is a thin wire made of a hard and brittle metal such as tungsten, the action of the tension during the pull-out by the pickup 6 performed while applying a predetermined tension. Alternatively, there is a risk of disconnection due to the action of various external forces.

When the filament F breaks, the broken filament F hangs down on the pickup 6 side or the filament drum 3 side. If the filament tension is continued without noticing this state, the electrode is There is a problem that a defective product in which the filament F is not stretched between 1a, 1a... Is generated, and the yield is reduced. This problem can be solved by allocating personnel for monitoring the disconnection, but such allocating of personnel is against the reduction of product cost by automation and is not a preferable solution.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and automatically detects a filament break occurring during operation of a filament stretching apparatus, and relies on humans for a reduction in yield due to the break. It is an object of the present invention to provide a filament disconnection detecting device which can be prevented without fail and which can effectively contribute to automation of a filament tensioning operation, and a filament tensioning device using the same.

[0014]

According to a first aspect of the present invention, there is provided a filament breakage detecting device including a motor for applying a rotational force to a filament drum in a direction opposite to a filament drawing direction, based on the detection of the rotational direction of the motor. In this configuration, it is determined whether or not the filament is broken.

In the present invention, during the drawing of the filament by the pickup, a rotating force is applied to the filament drum by the motor in a direction opposite to the drawing direction, and when the filament breaks, the filament drum is normally operated by the rotating force of the motor. The motor rotates in the opposite direction, and the rotation direction of the motor is detected to determine the presence or absence of the filament.

According to a second aspect of the present invention, there is provided a filament disconnection detecting device, wherein a filament drum is provided with a ratchet mechanism for regulating rotation of the filament in a direction opposite to the drawing direction of the filament, and the filament is detected based on detection of pressure applied to a ratchet claw of the ratchet mechanism. Is configured to determine the presence / absence of disconnection.

In the present invention, when the filament breaks, the filament drum rotates in the opposite direction to the direction in which the filament was pulled out, so that the ratchet pawl of the ratchet mechanism provided on the filament drum to regulate this rotation is provided. Is detected by, for example, a pressure-sensitive sensor attached to a contact portion with the ratchet gear to determine the breakage of the filament.

In a third aspect of the present invention, there is provided a filament disconnection detecting apparatus, wherein a leaf spring holding a filament at a tip is provided in a pickup, and the presence or absence of a filament disconnection is detected on the basis of the detection of deformation caused by drawing out of the filament. Is determined.

In the present invention, the grip portion of the filament in the pickup is provided at the distal end of a leaf spring having a fixed base end, and the leaf spring is configured to be deformed as the filament is drawn out. The presence or absence of a break in the filament is determined by the detection.

According to a fourth aspect of the present invention, there is provided a filament breakage detecting device which detects a deformation of a leaf spring by turning on a switch which contacts a part of the leaf spring.

According to the present invention, when the leaf spring returns from the deformed state due to the drawing due to the breakage of the filament, a switch is provided which comes into contact with a part of the leaf spring to turn on the leaf spring. Upon detection, the presence / absence of disconnection of the filament is determined.

A filament wire breakage detecting device according to a fifth aspect of the present invention detects a deformation of a leaf spring by a change in electric resistance of the leaf spring accompanying the deformation.

In the present invention, by utilizing the fact that the electric resistance of the leaf spring as a means for gripping the filament changes in accordance with the deformation, the deformation of the leaf spring accompanying the drawing of the filament is detected, including the degree thereof. Then, based on the result, the presence or absence of disconnection is determined with high accuracy.

According to a sixth aspect of the present invention, there is provided a filament breakage detecting device which includes a swinging lever which swings while holding the filament at one end thereof, and which is generated against the urging of the urging means as the filament is pulled out. In this configuration, it is determined whether or not the filament is broken based on the detection of the swing of the swing lever.

In the present invention, the grip portion of the filament in the pickup is provided at one end of a swing lever that swings around an appropriate axis, and the swing lever swings by the action of the grip portion when the filament is pulled out. The presence or absence of breakage of the filament is determined by detecting this swing.

According to a seventh aspect of the present invention, there is provided a filament breakage detecting device for detecting the swing of the swing lever by turning on a switch which is in contact with the other end of the swing lever.

In the present invention, when the swing lever is returned due to the breaking of the filament, the swing lever is provided with a switch that is turned on by contacting the other end thereof, and the swing of the swing lever is detected by a simple configuration, It is determined whether or not the filament is broken.

The filament disconnection detecting device according to the present invention includes a gripping portion for gripping the filament, and a receiving portion which is insulated and supported below the gripping portion. The configuration is such that the presence or absence of disconnection is determined.

In the present invention, when the filament breaks, the filament hangs down from the gripping portion and comes into contact with the receiving portion, so that an electrical conduction state is obtained between the receiving portion and the gripping portion. By detecting the conduction, it is determined whether or not the filament is broken.

In a twelfth aspect of the present invention, there is provided a filament breakage detecting device, wherein a gripping spring for gripping the filament at one end is provided on the pickup, and the presence or absence of a filament breakage is detected by the gripping spring based on the detection of elongation occurring in the filament drawing direction. This is a configuration for determination.

According to the present invention, the filament is gripped by the other end of a gripping spring such as a coil spring or a helical spring having one end fixed to the pickup, and the gripping spring is extended as the filament is pulled out. Then, it is determined whether or not the filament is broken based on the detection result of the elongation.

The filament disconnection detecting device according to the tenth aspect of the present invention includes a regulating plate for regulating the contraction of the gripping spring, and detects the extension of the gripping spring based on whether or not there is electrical conduction between the regulating plate and the gripping spring. Is what you do.

According to the present invention, there is provided a regulating plate for regulating the contraction of the gripping spring caused by the breaking of the filament, and when the regulation is performed, the electric contact between the gripping spring and the regulating plate is generated. The presence or absence of conduction is detected, and the presence or absence of breakage of the filament is determined based on the result.

In the eleventh aspect of the present invention, the filament breakage detecting device detects the elongation by detecting a change in the position of the gripping portion accompanying the elongation of the gripping spring.

In the present invention, the extension state of the gripping spring is detected by utilizing the change in the position of the filament gripping portion provided at the tip of the spring, and the presence or absence of a break in the filament is determined based on the result.

The filament tensioning device according to the twelfth aspect of the present invention is provided with gripping means which operates in response to the detection of the disconnection by the filament disconnection detecting device, and grips the filament on the drawing side of the filament drum.

In the present invention, when the filament disconnection is detected by the filament disconnection detecting device, the gripping means provided on the drawing side of the filament drum is operated, and the broken filament is gripped and the filament is transferred to the filament drum. It functions to prevent winding and facilitates resumption of operation after predetermined processing.

[0038]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 The present invention will be described below in detail with reference to the drawings showing an embodiment. FIG. 1 is a perspective view showing a configuration of a main part of a filament tensioning device provided with a filament disconnection detection device according to the present invention. FIG. 2 is a perspective view showing an entire configuration of a filament tensioning device provided with a filament disconnection detection device according to the present invention. It is a side view which shows typically.

In the illustrated filament stretching apparatus, the mounting table 20 of the support plate 1 and the filament drum 30 for winding and holding the filaments F are arranged on the common base 40 at an appropriate distance in the longitudinal direction. The welding head 50 is arranged so as to face the upper part of the mounting table 20, and the pickup 60 is provided so as to be movable including the space between the filament drum 30 and the mounting table 20.

As shown in FIG. 1, a guide table 21 extending in the longitudinal direction is provided substantially at the center of the base 40 in the width direction.
The mounting table 20 is fixed on a moving table 22 that moves along the guide table 21. Also, the mounting table 20
On one side, a guide table 61 extends in parallel with the guide table 21, and a movable table 62 is supported on the guide table 61 so as to be movable along the guide table 61. The pickup 60
Is a mounting table whose base end is supported by the moving table 62.
20 is fixed to the tip of a support arm 63 extending toward the side of the table 20.
It moves so that the upper part of it is included in the movement area.

A plurality (four in the figure) of filament filaments 30 are provided in correspondence with the required number of filaments F on the support plate 1, and the filament drum 30 is provided between the filament drum 30 and the pickup 60. Guide rollers 31 for individually guiding the filaments F drawn from the respective filament drums 30 are provided. In the illustrated filament stretching apparatus, each filament drum 30 has a characteristic configuration as a device for detecting a break in the filament F drawn from each filament drum. This configuration will be described later.

The pickup 60 is provided with a plurality of gripping portions for individually gripping the filaments F wound and held on the respective filament drums 30.
Grips the filaments F pulled out from each filament drum 30 and guided separately by the guide rollers 31 by the respective gripping portions, and in this state, moves toward the mounting table 20 according to the movement of the moving table 62. Then, the filament F is stretched on the mounting table 20 while maintaining a predetermined tension between the filament F and the guide roller 31. FIG. 1 and FIG. 2 show this state.

In the illustrated filament stretching apparatus, a gripping portion provided on the pickup 60 for gripping each filament F is characterized as a disconnection detecting device for detecting a disconnection of the filament F pulled out by the pickup 60. Configuration. This configuration will be described later.

As shown in FIG. 1, a gate-shaped frame 51 is provided on the upper portion of the base 40 so as to straddle the upper portion of the mounting table 20 in the width direction.
Has been erected. The welding head 50 is configured as a YAG laser welding machine that emits a YAG laser downward, and includes a moving table 52 that moves along the upper surface of a cross beam of the portal frame 51; The upper part is fixed including the moving area. In addition, portal frame 51
A pressure head 53 is provided substantially at the center of the mounting table 20 at a position where the movement of the welding head 50 is not hindered.

The support plate 1 mounted on the mounting table 20 is a rectangular thin metal plate provided with a plurality of electrodes 1a, 1a... Arranged in the longitudinal direction, like the support plate 1 shown in FIG.
The supply onto the mounting table 20 is performed manually or automatically as in the conventional case. Stretching of the filaments F on the mounting table 2 by the above-described operation of the pickup 6 is performed after the supply of the support plate 1, and each filament F is attached to the upper portion thereof together with the tab frame 8 supplied as described later. Are welded to the electrodes 1a of the support plate 1 by the operation of the welding head 50.

FIG. 3 is an explanatory diagram of this welding procedure. The tab frame 8 is, as shown in FIG.
A plurality of tabs 8a, 8a,... Are integrally formed so as to be separated from each other by rectangular holes long in the width direction formed at predetermined intervals in the longitudinal direction.
The formation positions of these tabs 8a, 8a ... correspond to the formation positions of the electrodes 1a, 1a ... on the support plate 1. When the tab frame 8 is positioned in a state of being superimposed on the support plate 1, the former tabs are formed. Each of 8a, 8a ... is the latter electrode 1a, 1a ...
Aligned above.

As shown in FIG. 3 (b), the positioning of the tab frame 8 on the support plate 1 is performed by setting the filaments F on the support plate 1 so as to intersect each of the electrodes 1a at a substantially right angle. , F ..., these filaments F, F ... are connected to the tabs 8a, 8a ... and the electrodes 1a,
1a and so on.

The filament F is connected to each electrode of the support plate 1.
Positioning the welding head 50 on the upper part of the tab 8a aligned with 1a, the YAG laser emitted from the welding head 50,
As shown by the arrow in the figure, by irradiating the tub 8a and the intersection of the electrode 1a and each filament F, it is welded to the electrode 1a formed on the support plate 1 together with the tub 8a.

The mounting table 20 can be moved in the longitudinal direction of the base 40 in accordance with the movement of the moving table 22, and the positioning of the welding head 50 on the upper part of each tab 8a is performed by positioning the mounting table 20. It is realized by moving. The welding head 50
The width direction of the base 40 according to the movement of the moving table 52, that is,
The placement table 20 can be moved in the width direction, and this movement is performed so that the welding head 50 positioned on each tab 8a is aligned with the intersection position of each filament F.

At the time of this welding, the pressure head 53 is lowered onto the mounting table 2 and, as shown by a two-dot chain line in FIG. 3B, the electrode 1a of the support plate 1 to be welded.
And the filaments F, F,... Together with the tab 8a overlapping the upper portion of each electrode 1a, has the effect of pressing over substantially the entire area in the width direction. The pressurizing head 53 has holes 54, 54... Penetrating vertically through the corresponding position of the crossing portion. Irradiation of the YAG laser from the welding head 50
It's done through 54 ...

After the welding is completed in this manner, the mounting table 20 is moved by moving the moving table 22 so that the side edge of the support plate 1 is located immediately below the welding head 50. In this state, the moving table 52 is moved. The welding head 50 is moved by the movement of
The filament F is blown by irradiating a G laser. As a result, a product in which the required number of filaments F are stretched on the support plate 1 is obtained.

As shown in FIG. 1, a stacker 80 is provided on the base 40 on the opposite side of the guide table 61 of the pickup 60 across the mounting table 20. The tab frame 8 used as described above is A plurality of sheets are vertically stacked and held by the stacker 80. The stacker 80 is substantially vertically erected.
, And a support base 82 arranged at the center thereof so as to be able to move up and down. The tab frame 8, which has a rectangular flat plate shape as described above,
By the action of 81, 81..., They are aligned up and down, and are stacked and held on the support base 82.

The tab frame 8 thus held by the stacker 80 is placed on one side of the welding head 50 by the transfer device 70 fixed to the moving table 52 on one side.
Supplied above. The transfer device 70 includes an elevating head 71 that can move in the vertical direction, and a suction unit that is suspended below the head.
The suction units 72, 72 are moved in the width direction of the base 40 in accordance with the movement of the moving table 52, and are moved up and down by moving the elevating head 71 at each moving position. It can be moved to.

The suction units 72, 72 by moving the moving table 52
Is set between the upper part of the stacker 80 and the upper part of the mounting table 20. The suction portions 72, 72 are provided with, for example, a vacuum cup made of an elastic material whose diameter is enlarged toward the lower portion, press this against an adsorbent, and perform an adsorption action by exhausting the inside of the cup. The suction is released by air supply.

The transfer device 70 moves onto the stacker 80 in accordance with the movement of the moving table 52, and at this position, the lifting head 70
And the suction portions 72, 72 are pressed against the tab frames 8 stacked on the uppermost portion of the stacker 80 to be suctioned, and the suctioned tab frames 8 are pulled up by the raising and lowering heads 70. Placement table 20 by moving
After being conveyed upward, it is lowered onto the mounting table 20 by the lowering of the elevating head 70, and a series of operations for supplying onto the mounting table 20 by releasing suction at this position are performed.

By this operation, the tab frames 8 held by the stacker 80 are supplied one by one to the mounting table 20 in order from the top one, and the support plate 1 supplied first is supplied.
Are placed on a filament F bridged on the upper part of the electrodes, and as shown in FIG. 3, each electrode 1a, 1a.
Together with the filament F.

As described above, the use of the tab frame 8 integrally provided with the tabs 8a, 8a.
20 can be easily transported on the support table 1, and the tabs 8a,
The positioning of the filament 8a can be easily performed, and the welding of the filament F in this state can be performed without a fear of occurrence of a displacement.

Support 82 supporting the lower portion of tab frame 8
Is raised each time one or more times of conveyance are performed, and operates so as to push up the tab frame 8 stacked on the upper portion and keep the upper surface of the uppermost tab frame 8 at a substantially constant height position. Thereby, the suction by the suction units 72, 72 can be performed reliably.

The support base 82 is rapidly lowered at the timing when the uppermost tab frame 8 is sucked by the suction parts 72, 72, and the tab frames 8, 8 stacked below the tab frame 8 are stacked. … Is performed.
Thereby, it is possible to separate only the tab frames 8 sucked by the suction units 72, 72, and it is possible to perform the conveyance of each sheet satisfactorily.

In the filament stretching apparatus configured as described above, there is a possibility that the filament F drawn out by the pickup 60 may be blown when welding with the electrodes 1a, 1a,. There is a risk of disconnection, and disconnection detecting devices for detecting such a disconnection of the filament F are provided on the filament drum 30 side for winding and holding the filament F and on the pickup 60 side for drawing out the filament F, respectively. ing.

First, an apparatus for detecting a disconnection of the filament F on the filament drum 30 will be described. As shown in FIG. 2, each of the filament drums 30 for winding and holding the filament F is provided with a motor 32 for applying a rotational force to the filament drum 30. The motor 32 is used to detect disconnection. is there.

FIGS. 4 and 5 are explanatory views of the operation of the disconnection detecting device. FIG. 4 is a plan view showing a state of drawing out the filament F from the filament drum 30, and FIG. 5 is a side view thereof. As shown in the drawing, the filament F wound and held on the filament drum 30 is pulled out by grasping the tip thereof by a grasping portion 60a provided in the pickup 60, and as shown in the drawing, the support plate 1 and the tab frame 8 are schematically illustrated. Is supplied between

Motor attached to filament drum 30
32 is coaxially connected to the rotation axis of the filament drum 30, and as shown in FIG.
Further, a rotational force in a direction opposite to the pull-out direction of the filament F by the pickup 60 is applied. The rotational force is such that the force P ₂ applied to the filament F on the periphery of the filament drum 32 by this rotation is
Applied by the pickup 60 in the pull-out direction
₁ is set to be sufficiently smaller than _1.
It is designed to be able to perform without any trouble against the rotation force of 32.

The motor 32 is provided with a rotation detector 33 for detecting its rotation, and the output of the rotation detector 33 is given to a rotation direction discriminator 34. Rotation detector 33
For example, a rotary encoder can be used. The rotation direction determiner 34 determines the rotation direction of the motor 32 and the filament drum 30 coaxially connected thereto based on the output of the rotation detector 33.
When clockwise in FIG. 5, that is, when the rotation is in the opposite direction to the rotation accompanying the drawing of the filament F, a predetermined output is generated.

In the disconnection detecting device configured as described above, since the force P ₂ applied to the filament F by the rotation of the motor 32 is sufficiently smaller than the force P ₁ applied by the pickup 60, it is extracted by the pickup 60. If the filament F is not broken, the filament drum 30 rotates counterclockwise in FIG. 5 in response to the pull-out, and the output of the rotation direction discriminator 34 cannot be obtained. During this time, the motor 32 follows the rotation of the filament drum 30 in a switched state.

On the other hand, when the filament F is broken at an appropriate position in the middle thereof, such as a welded portion to the support plate 1, the filament drum 30 from which the applied force from the pickup 60 is lost, The clockwise rotation in FIG. 5 is caused by the rotation force, and the rotation direction discriminator 34 emits a predetermined output. In this manner, the presence or absence of a break in the filament F can be determined based on the output of the rotation direction determiner 34, and the break can be detected.

FIG. 4 shows two filament drums.
30 and 30, and a motor 32 and a rotation detector 33 attached thereto.
And rotation direction discriminator 34 are shown,
Each of the four filament drums 30, 30... Shown in FIG. 2 is provided so that disconnection is detected in each filament drum 30. FIG. 2 shows a motor 32 connected to each filament drum 30.

Embodiment 2 FIGS. 6 and 7 are operation explanatory views showing another embodiment of the disconnection detecting device on the filament drum 30 side. FIG.
FIG. 7 is a plan view of the filament drum 30, and FIG. Similar to the disconnection detecting device shown in FIGS. 4 and 5, the disconnection detecting device shown in this figure includes a motor 32 coaxially connected to a filament drum 30, a rotation detector 33 attached to the motor 32, and the rotation detector 33. A rotation direction discriminator 34 for discriminating the rotation direction of the motor 32 from the output of the detector 33 is provided, and the disconnection of the filament F is detected based on the output of the rotation direction discriminator 34.

In addition, the disconnection detecting device includes a ratchet mechanism 35 including a ratchet gear 35a coaxially fitted on the rotating shaft of the filament drum 30 and a ratchet claw 35b facing the outer periphery of the ratchet gear 35a. The rotation of the motor 32 following the disconnection of the filament F causes the filament drum to rotate.
The clockwise rotation occurring at 30 is regulated within a predetermined rotation angle range by the contact of the ratchet pawl 35b with the teeth formed on the outer periphery of the ratchet gear 35a.

According to this configuration, there is no danger that the broken filament F is wound around the rotating filament drum 30 by the rotation of the motor 32, and the filament F is mounted on the pickup 60 at the start of the operation after the disconnection treatment. Can be easily performed. Further, since the rotation of the filament drum 30 by the ratchet mechanism 35 is restricted after the rotation of the filament drum 30 by a predetermined angle is permitted, there is no fear that the detection of the disconnection by the output of the rotation direction discriminator 34 will be hindered.

Third Embodiment FIGS. 8 and 9 are operation explanatory diagrams showing still another embodiment of the disconnection detecting device on the filament drum 30 side.
Is a plan view of the filament drum 30, and FIG. 9 is a side view of the same. The disconnection detection device shown in FIG.
Similarly to the disconnection detecting device shown in FIG. 1, a ratchet mechanism 35 including a ratchet gear 35a coaxially fitted on the rotating shaft of the filament drum 30 and a ratchet claw 35b facing the outer periphery of the ratchet gear 35a is provided. Further, although a motor 32 coaxially connected to the filament drum 30 is provided, a rotation detector 33 and a rotation direction discriminator 34 are not provided, and as shown in FIG. An interposed pressure-sensitive sensor 36 is provided, and the disconnection of the filament F is detected based on the output of the pressure-sensitive sensor 36.

When the filament F breaks, the filament drum 30 rotates clockwise due to the rotation of the motor 32. At this time, the ratchet gear
The ratchet pawl 35b contacts the teeth formed on the outer periphery of 35a, and functions to regulate the rotation. At this time, the rotational force of the motor 32 is applied to the filament drum 30, and a pressure corresponding to the rotational force is applied to the support portion of the ratchet claw 35b, and the pressure-sensitive sensor 36 interposed in the support portion.
Is detected by Accordingly, the output of the pressure sensor 36 is compared with, for example, a preset threshold value, and when the output exceeds the threshold value, it is possible to determine that the filament F is broken.

According to this configuration, as the pressure-sensitive sensor 36,
An inexpensive sensor such as a strain gauge can be used, and the disconnection can be detected with a simple configuration. In addition, the broken filament F is wound around the filament drum 30 similarly to the disconnection detecting device shown in FIGS. Operation can be easily resumed after the disconnection treatment.

In this embodiment, the motor 32 is
It only urges the filament drum 30 in the direction opposite to the pull-out direction and acts only as an urging means for applying pressure to the ratchet claw 35b when the wire breaks, and instead of the motor 32,
It is possible to use mechanical biasing means such as a spring,
Thereby, the configuration can be further simplified.

Embodiment 4 Next, a description will be given of an apparatus for detecting a breakage of the filament F on the pickup 60 side. FIGS. 10A and 10B are explanatory diagrams of the operation of the disconnection detecting device on the pickup 60 side.

The pickup 60 shown in the figure is supported by a base spring 64 fixed to the tip of the support arm 63 and suspended substantially vertically on a lower surface thereof, and has a leaf spring 65 having a filament F holding means at its lower end. Have. This pickup 60
The filament F is gripped at the tip of the leaf spring 65, and the filament F is moved to the left in the drawing and pulled out. At this time, the leaf spring 65 is acted on by the tension applied to the filament F as shown in FIG. And bends and deforms in the direction opposite to the pull-out direction.

On the lower surface of the base 64, an electrode piece 66 made of a conductive material is supported at a position separated from the supporting position of the leaf spring 65 in a direction opposite to the direction of the pull-out. The leaf spring 65, which is flexed and deformed in accordance with the above, comes into contact with the electrode piece 66. The disconnection detection device
As described above, the leaf spring 65 and the electrode piece 66 that come into contact with each other as a switch are incorporated in a closed circuit including the power source E and the current detector G.

In the pickup 60 configured as described above, while the filament F is being pulled out, the switch constituted by these elements is turned on by the contact between the middle of the leaf spring 65 and the electrode piece 66, and the current detector G is turned on. Detect the current flow.
On the other hand, when the filament F breaks during the drawing, the leaf spring 65 gripping the tip returns to the initial shape as shown in FIG. As a result, the current detector G does not detect the current flow. Thus, by detecting the on / off of the switch constituted by the leaf spring 65 and the electrode piece 66 using the output of the galvanometer G as a medium, it is possible to determine whether or not the filament F is disconnected.

Fifth Embodiment FIGS. 11A and 11B are operation explanatory diagrams showing another embodiment of the disconnection detecting device on the pickup 60 side. The pickup 60 shown in this drawing, like the pickup 60 shown in FIG. 10, includes a leaf spring 65 and an electrode piece 66 suspended from a base 64, and the disconnection detection device uses the leaf spring 65 and the electrode piece 66. Are incorporated in a closed circuit including a power supply E and a current detector G as switches.

This embodiment differs from the embodiment shown in FIG. 10 in that the leaf spring 65 has an initial shape curved in the direction in which the filament F is drawn out, and the electrode piece 66 It is supported at a position separated from the leaf spring 65 in the direction of drawing out the filament F.

In the pickup 60 configured as described above, while the filament F is being pulled out, the leaf spring 65
Is linearly elastically deformed by the action force from the filament F, separates from the electrode piece 66 as shown in FIG.
The switch constituted by these elements is turned off, and the current detector G does not detect the current flow. On the other hand, if the filament F breaks during the drawing, the leaf spring 65 returns to the above-mentioned initial shape due to the loss of the acting force from the filament F, and as shown in FIG.
And the switch constituted by these switches is turned on, and the current detector G detects the flow of current.

As described above, by detecting the on / off of the switch constituted by the leaf spring 65 and the electrode piece 66 using the output of the current detector G as a medium, it is possible to determine the presence or absence of the breakage of the filament F. However, in the embodiment shown in FIG. 10, the filament F
In contrast, in the embodiment shown in FIG. 11, the disconnection of the filament F is detected by turning on the switch.

Embodiment 6 FIGS. 12 (a), 12 (b) and 13 are operation explanatory diagrams showing still another embodiment of the disconnection detecting device on the pickup 60 side. The pickup 60 shown in this drawing includes a leaf spring suspended from a base 64 similarly to the pickup 60 shown in FIGS. 10 and 11, and this leaf spring is made of a pair of spring pieces 65a and 65b made of an insulator. It has a configuration in which it is laminated in the thickness direction via an intermediate piece 65c, and the filament F is gripped at the tip of one of the spring pieces 65b, and moves to the left in the drawing and is pulled out. The acting force from the filament F causes the 65a and 65b to bend and deform in the direction opposite to the drawing direction as shown in FIG.

As shown in FIG. 13, the disconnection detecting device includes spring pieces 65a and 65b constituting a leaf spring in separate closed circuits including power sources E ₁ and E ₂ and galvanometers G ₁ and G ₂ , respectively. And the outputs of the current detectors G ₁ and G ₂ are compared with the comparator 66.
And the disconnection is detected in accordance with the output of the comparator 66.

In the pickup 60 configured as described above, the spring pieces 65a and 65b constituting the leaf spring are deformed while the filament F is being pulled out as shown in FIG. 12 (a). The spring piece 65b on the gripping side is compressed while the spring piece 65a on the other side is expanded, and this deformation causes a difference in the electrical resistance values of the spring pieces 65a and 65b, and the closed spring pieces 65a and 65b are incorporated. A difference occurs between the outputs of the current detectors G ₁ and G _{2 in} the circuit, and the output of the comparator 66 becomes a high level.

On the other hand, when the filament F breaks during the drawing, the spring pieces 65a and 65b constituting the leaf spring return to the initial shape as shown in FIG. However, there is no difference between the two electric resistance values, and the output of the comparator 66 becomes low level. As described above, by detecting the change in the electric resistance due to the deformation of the leaf spring formed by the spring pieces 65a and 65b using the output of the comparator 66 as a medium, it is possible to determine whether or not the filament F is disconnected.

In this embodiment, as shown in FIG. 11, a leaf spring having a curved initial shape may be used. Further, as shown in FIGS. 10 and 11, a closed circuit including the leaf spring as a resistor is formed by using a leaf spring constituted by one piece of metal, and a change in a current value flowing through the closed circuit is changed. It is also possible to adopt a configuration in which the presence / absence of disconnection is determined based on the above. However, in this case, it is necessary to detect a change in the current value with high accuracy.

Embodiment 7 FIGS. 14 (a) and 14 (b) are operation explanatory diagrams showing still another embodiment of the disconnection detecting device on the pickup 60 side. The pickup 60 shown in the figure includes a base 64 fixed to the tip of the support arm 63, a support 67 hanging down from the lower surface of the base 64,
A swing lever 68 pivotally supported by the lower end of the support 67.
And The swing lever 68 has a grip portion for the filament F at one end thereof, and swings around a horizontal axis substantially orthogonal to the drawing direction of the filament F.

The pickup 60 moves to the left in the drawing to draw out the filament F. At this time, the swing lever 68 is actuated by the action force from the filament F, as shown in FIG. The gripping end of F is moved in the direction opposite to the pull-out direction to swing. On the lower surface of the base 64, an electrode piece 69 made of a conductive material is suspended and supported at a position separated from the supporting position of the leaf spring 65 in the drawing direction, and the electrode piece 69 pulls out the filament F. And comes into contact with the other end of the swing lever 68 which swings with the movement. The disconnection detecting device is configured by incorporating the swing lever 68 and the electrode piece 69 that come into contact as described above as switches into a closed circuit including the power source E and the current detector G.

In the pickup 60 configured as described above, while the filament F is being pulled out, the swing lever 68
The switch constituted by these contacts is turned on by the contact between the power supply and the electrode piece 69, and the current detector G detects the flow of current. On the other hand, when the filament F is broken during the drawing, the swing lever 68 gripping the one end of the filament F loses the action force from the filament F, as shown in FIG.
67, the other end of the swing lever 68 is separated from the electrode piece 69, and the switch is turned off. As a result, the current detector G does not detect the current flow. in this way,
By detecting the on / off of the switch constituted by the swing lever 68 and the electrode piece 69 using the output of the galvanometer G as a medium, it is possible to determine whether or not the filament F is disconnected.

Embodiment 8 FIGS. 15 (a) and 15 (b) are operation explanatory diagrams showing still another embodiment of the disconnection detecting device on the pickup 60 side. The pickup 60 shown in the figure has a base 64 fixed to the tip of a support arm 63, and a filament F suspended from the lower surface of the base 64.
And a receiving portion 74 supported at the lower end of the holding portion 73. The pickup 60 grips the filament F in the middle of the gripping portion 73, and moves to the left in the drawing to pull it out.

The receiving portion 74 is a conductive member which is insulated and supported by the grip portion 73 in such a manner as to protrude in a direction opposite to the pulling-out direction. The receiving part 74 is incorporated as a disconnecting part in a closed circuit including the power source E and the current detector G.

In the pickup 60 configured as described above, during the drawing of the filament F performed as shown in FIG. 15A, an electrical conduction state occurs between the holding portion 73 and the receiving portion 74. The current detector G does not detect the current flow. On the other hand, when the filament F is broken during the drawing, the broken filament F is hung on the receiving portion 74 as shown in FIG. Electrical conduction occurs between 73 and the receiving portion 74, and the current detector G detects the flow of current. As described above, by detecting the electrical conduction state between the holding portion 73 that holds the filament F and the receiving portion 74 that receives the disconnected filament F by using the output of the galvanometer G as a medium, the filament F The presence / absence of disconnection can be determined.

Ninth Embodiment FIGS. 16 (a) and 16 (b) and FIGS. 17 (a) and 17 (b) are operation explanatory views showing still another embodiment of the disconnection detecting device on the pickup 60 side. The pickup 60 shown in FIG. 16 is provided with a grip spring 75 configured as a helical spring at a position below the base 64, and moves leftward in the drawing to draw out the filament F. The gripping spring 75 is wound around a horizontal support shaft that is substantially perpendicular to the drawing direction of the filament F, and its tip projects through a regulating plate 76 that is suspended and supported on one side of the base 64. F is gripped by the protruding end via a grip portion 75a.

The gripping portion 75a and the regulating plate 76 are both made of a conductor, and constitute a switch that is turned on when they are brought into contact with each other. The disconnection detecting device is a closed circuit having a power source E and a current detector G. The switch is incorporated therein. In the pickup 60 configured as described above, while the filament F is being pulled out, the gripping spring 75 is deformed by the action force from the filament F so as to be wound around the support shaft, and as shown in FIG. As shown in the figure, the distal end of the filament F provided with the grip portion 75a extends and separates from the regulating plate 76. As a result, the switch constituted by the two is turned off, and the current detector G does not detect the flow of current.

On the other hand, when the filament F is broken during the drawing, the gripping spring 75 elastically returns to the initial shape due to the loss of the acting force from the filament F, and has a grip portion 75a as shown in FIG. The tip side shrinks and the gripper
The contact 75a comes into contact with the regulating plate 76, the switch constituted by the two is turned on, and the current detector G detects the flow of current. As described above, the extension of the gripping spring 75 caused by the drawing out of the filament F is controlled by the regulating plate for regulating the contraction and shortening thereof.
By detecting the on / off of a switch provided between the filament F and the medium, it is possible to determine whether or not the filament F is disconnected.

The pickup 60 shown in FIG. 17 has a gripping spring 77 configured as a coil spring. This gripping spring 77 has one end fixed to the base 64 and the filament F
End plate 78a of a support plate 78 protruding in the same direction from the base 64 at the other end.
When the filament F is pulled out by the leftward movement in the figure by grasping the end of the filament F introduced from the
It extends as shown in FIG. 17 (a). Support plate
In order to detect the extension of the gripping spring 77 generated as described above, a pair of position detectors 79a and 79b are attached to the surface facing the gripping spring 77 at a predetermined distance in the direction of the extension. These can be configured, for example, as proximity switches that detect the proximity of the grip 77a.

In the pickup 60 thus constructed, while the filament F is being pulled out, the gripping spring 77 is actuated by the action force from the filament F as shown in FIG.
The position detector 79b, to which the grip 77a approaches, emits an output as shown in FIG. On the other hand, if the filament F breaks during the drawing, the gripping spring 77
FIG. 17 shows that the action force from the filament F is lost.
As shown in (b), the state is shortened, and at this time, the position detector 79a, to which the gripper 77a is close, emits an output. As described above, the extension of the gripping spring 77 caused by the drawing of the filament F can be detected as outputs of the position detectors 79a and 79b, and it is determined whether or not the filament F is disconnected based on these outputs. Can be.

As described above, the configuration shown in FIG. 17 for determining the presence / absence of disconnection based on the detection of the extension position is the pickup shown in FIG. 16 provided with the gripping spring 75 using a helical spring.
60 is also feasible. Conversely, the configuration shown in FIG. 16 that determines the presence or absence of disconnection based on the presence or absence of electrical conduction between the gripping spring and the regulating plate that regulates the contraction of the gripping spring includes a gripping spring 77 using a coil spring. Pickup 60 shown
It is also feasible.

Embodiment 10 FIGS. 18A and 18B are explanatory views of the operation of the gripping means 9 which operates according to the detection of the breakage of the filament F by the various breakage detecting devices configured as described above. As shown in the figure, the gripping means 9 has a configuration in which a fixed gripping piece 9a and a movable gripping piece 9b are provided above and below a filament F drawn from the filament drum 30. The fixed gripping piece 9a is fixedly supported above the drawing path of the filament F, and the movable gripping piece 9b is sandwiched between the filament F and the fixed gripping piece 9a.
, And can be raised toward the fixed gripping piece 9a by operation of a driving means (not shown).

While the filament F is being normally pulled out, the gripping means 9 does not hinder the drawing out of the filament F with the fixed gripping piece 9a, as shown in FIG.
As shown in FIG. 18, the movable gripping piece 9b is kept in a non-operating state in which the movable gripping piece 9b is lowered, while the movable gripping piece 9b is operated in response to the disconnection detection by the above-described disconnection detecting device to raise the movable gripping piece 9b, as shown in FIG. Then, the broken filament F is clamped between the fixed gripping piece 9a.

By providing the gripping means 9 which performs such an operation, the broken filament F is prevented from being caught in the filament drum 30, and when the operation is started after the disconnection treatment, the filament F can be easily mounted on the pickup 60. Can be done. This gripping means, as shown in FIG.
It can be provided at an appropriate position between the filament drum 30 and the mounting table 20, such as on the downstream side of the guide roller 31.

[0103]

As described in detail above, the filament disconnection detecting apparatus according to the first aspect of the present invention is provided with a motor for applying a rotational force to the filament drum in a direction opposite to the drawing direction of the filament. Since the filament drum is rotated in the opposite direction to the normal state by the rotational force of the motor, it is possible to reliably detect the breakage of the filament based on the detection result of the rotation direction of the motor. The reduction in yield can be eliminated.

In the filament disconnection detecting device according to the second aspect of the present invention, the filament drum is provided with a ratchet mechanism for restricting rotation in a direction opposite to the drawing direction of the filament, and restricts the rotation when the filament is disconnected. Since the pressure applied to the ratchet pawl is detected as desired, disconnection of the filament can be detected based on the detection result, and reliable disconnection can be detected with a simple configuration. In addition, the restriction of the filament drum by the ratchet mechanism prevents the broken filament from being wound around the filament drum, and makes it easy to resume the operation after the disconnection processing.

In the filament disconnection detecting device according to the third aspect of the present invention, a leaf spring which is deformed as the filament is pulled out is employed in the filament gripping portion of the pickup, and the leaf spring is elastic when the filament is disconnected. Since it is configured to return, the disconnection can be reliably detected based on the result of detecting the deformation of the leaf spring.

In the filament disconnection detecting device according to the fourth aspect of the present invention, a switch which is turned on by contact with a part of a leaf spring for gripping the filament is configured.
The deformation of the leaf spring can be easily detected by the on / off state of the switch, and the disconnection of the filament can be reliably detected.

Further, in the filament breakage detecting device according to the fifth aspect of the present invention, since the deformation of the leaf spring holding the filament is detected by a change in electric resistance accompanying the deformation, the deformation of the leaf spring can be detected with high accuracy. , And accurate disconnection detection is performed.

In the filament disconnection detecting device according to the sixth aspect of the present invention, since the swing of the swing lever that swings while holding the filament at one end is detected and the presence / absence of the filament disconnection is determined, a simple configuration is provided. In this way, accurate disconnection detection becomes possible.

In the filament disconnection detecting device according to the seventh aspect of the present invention, the swing of the swing lever is detected by turning on / off a switch which is in contact with the other end of the swing lever.
This detection can be easily performed, and accurate disconnection detection can be performed with a simple configuration.

Further, the filament disconnection detecting device according to the invention of claim 8 is provided with a grip portion for gripping the filament and a receiving portion which is insulated and supported at a position below the filament, so that when the filament is broken, the filament hanging from the grip portion is removed. Since it is configured such that an electrical conduction state can be obtained between the two by contacting the receiving portion, accurate disconnection detection can be performed without having a movable portion based on the presence or absence of the electrical conduction. .

In the filament disconnection detecting device according to the ninth aspect of the present invention, the presence or absence of the filament disconnection is determined based on the detection of elongation of the gripping spring holding the filament at one end in the drawing direction of the filament. In addition, reliable disconnection detection can be performed with a simple configuration.

The filament disconnection detecting device according to the tenth aspect of the present invention is provided with a regulating plate for regulating the contraction of the gripping spring, and the extension of the gripping spring is determined by the presence or absence of electrical conduction between the regulating plate and the gripping spring. , The extension can be easily detected and the disconnection can be determined based on the extension, and accurate disconnection can be detected with a simple configuration.

In the filament disconnection detecting device according to the eleventh aspect of the present invention, the extension of the gripping spring is detected by using a change in the position of the gripping portion of the filament, so that accurate detection including the extent of the extension becomes possible. Disconnection can be detected.

Further, in the filament stretching apparatus according to the twelfth aspect of the present invention, when the disconnection of the filament is detected, the gripping means provided on the drawing side of the filament drum operates to grip the filament. The present invention has an excellent effect, for example, it is possible to easily restart the operation after the disconnection without being wound up.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a main part of a filament stretching device including a filament disconnection detection device according to the present invention.

FIG. 2 is a side view showing the overall configuration of the filament stretching apparatus shown in FIG.

FIG. 3 is an explanatory view of a procedure for welding a filament.

FIG. 4 is a diagram illustrating the operation of the disconnection detecting device on the filament drum side.

FIG. 5 is a diagram illustrating the operation of the disconnection detecting device on the filament drum side.

FIG. 6 is an operation explanatory view showing another embodiment of the disconnection detecting device on the filament drum side.

FIG. 7 is an operation explanatory view showing another embodiment of the disconnection detecting device on the filament drum side.

FIG. 8 is an operation explanatory view showing still another embodiment of the disconnection detecting device on the filament drum side.

FIG. 9 is an operation explanatory view showing still another embodiment of the disconnection detecting device on the filament drum side.

FIG. 10 is a diagram illustrating the operation of the disconnection detection device on the pickup side.

FIG. 11 is an operation explanatory view showing another embodiment of the disconnection detecting device on the pickup side.

FIG. 12 is an operation explanatory view showing another embodiment of the disconnection detection device on the pickup side.

13 is an electric circuit diagram of the disconnection detecting device shown in FIG.

FIG. 14 is an operation explanatory view showing another embodiment of the disconnection detecting device on the pickup side.

FIG. 15 is an operation explanatory view showing another embodiment of the disconnection detection device on the pickup side.

FIG. 16 is an operation explanatory view showing another embodiment of the disconnection detecting device on the pickup side.

FIG. 17 is an operation explanatory view showing another embodiment of the disconnection detecting device on the pickup side.

FIG. 18 is an explanatory diagram of the operation of the gripping means.

FIG. 19 is a side view showing the overall configuration of a conventional filament stretching apparatus.

FIG. 20 is an explanatory view of a procedure for welding a filament to a support plate in a conventional filament stretching apparatus.

[Description of Signs] 1 support plate, 1a electrode, 8 tab frame, 8a tab, 9 gripping means, 30 filament drum, 32 motor, 33 rotation detector, 34 rotation direction discriminator, 35 ratchet mechanism, 36 pressure sensitive sensor, 60 Pickup, 65 leaf spring, 65a spring piece, 65b spring piece, 66 electrode piece, 68
Swing lever, 69 electrode piece, 73 gripper, 74 receiver, 75
Grip spring, 75a Grip, 76 regulating plate, 77 Grip spring, 77a Grip, 79a, 79b Position detector, F filament.

Claims (12)

[Claims] 1. A motor provided on a filament drum for winding and holding a linear filament drawn by a pickup, and a motor for applying a rotational force to the filament drum in a direction opposite to a drawing direction of the filament, and detecting a rotation direction of the motor. And a means for determining the presence or absence of a break in the filament based on the detection result of the detection means. 2. A ratchet mechanism provided on a filament drum for winding and holding a linear filament drawn by a pickup, and for restricting rotation of the filament drum in a direction opposite to a drawing direction of the filament,
A filament disconnection detection comprising: a pressure-sensitive sensor that detects pressure applied to a ratchet claw of the ratchet mechanism; and a determination unit that determines whether or not the filament is disconnected based on a detection result of the pressure-sensitive sensor. apparatus. 3. A pick-up for gripping and pulling out a linear filament wound and held on a filament drum, gripping the filament at its tip, and deforming in the direction of the pull-out as the filament is pulled out. A filament breakage detecting device, comprising: a leaf spring; deformation detecting means for detecting deformation of the leaf spring; and means for determining whether or not the filament is broken based on a detection result of the deformation detecting means. . 4. The filament disconnection detecting device according to claim 3, wherein the deformation detecting means is a switch that is turned on by contact with a part of the leaf spring. 5. The filament breakage detecting device according to claim 4, wherein the deformation detecting means detects a change in electric resistance of the leaf spring due to the deformation. 6. A pick-up for drawing out a linear filament wound and held on a filament drum,
A swinging lever that holds the filament at one end thereof and swings as the filament is pulled out, biasing means that biases the swinging lever in a direction opposite to the pulling-out direction, and swinging of the swinging lever. And a judging means for judging the presence / absence of filament breakage based on the detection result of the oscillation detecting means. 7. The filament breakage detecting device according to claim 6, wherein the swing detecting means is a switch that is turned on by contact with the other end of the swing lever. 8. A pick-up for drawing out a linear filament wound and held on a filament drum,
A conductive gripping portion for gripping the filament, a conductive receiving portion insulated and supported below the gripping portion, and detecting electrical conduction between the receiving portion and the gripping portion. A filament disconnection detecting device, comprising: means for determining whether or not the filament is disconnected based on the detection result of the means. 9. A pickup for pulling out a linear filament wound and held on a filament drum,
One end thereof has a grip portion for the filament, and the grip spring extends in the direction of the pull-out as the filament is pulled out, extension detection means for detecting the extension of the grip spring, and a detection result of the extension detection means. Determining means for determining the presence or absence of a break in the filament on the basis of the above. 10. An extension detecting means for detecting a restricting plate for restricting the contraction of the gripping spring by contacting a part of the restricting spring, and detecting whether or not there is electrical conduction between the restricting plate and the gripping spring. 10. The filament disconnection detecting device according to claim 9, comprising means. 11. The extension detecting means is configured to detect a change in the position of the gripping portion due to the extension of the gripping spring.
The filament disconnection detecting device according to the above. 12. A filament breakage detecting device according to claim 1, wherein said filament breakage detecting device operates in response to a breakage detection by said filament breakage detecting device, and grips the filament on a drawing side of a filament drum. Filament tensioning device comprising means.