JPH08175755A - Tension adjusting device - Google Patents

Abstract

PURPOSE: To provide an optimum and highly accurate tension adjusting device that is suited to adjustment of tension of a wire-like material such as a fiber yarn, which is relatively easy to be cut. CONSTITUTION: A fiber yarn hung to a tension pulley 22 and a guide pulley 34 passing through a line presser 19 travels by holding a constant tension by a braking torque of an electromagnetic braking device equipped with the tension pulley 22. As the tension of the fiber yarn increases, a tension arm 31 by which the guide pulley 34 is supported turns clockwise so that braking torque of the electromagnetic braking device decreases. When the tension of the fiber yarn decreases, the tension arm 31 is turned in the counterclockwise direction so that braking torque of the electromagnetic braking device increases. The tension arm 31 swinging by repetition of such actions swings while its vibration being absorbed by a viscous damper 38 so that slack and cut of the fiber yarn can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension adjusting device for applying a constant tension to a filament material such as fiber yarn. In particular, the present invention relates to a tension adjusting device for winding a raw yarn unwound from each bobbin of a creel on a warping drum and a control circuit of the device.

[0002]

2. Description of the Related Art A conventional tension adjusting device is provided with a tension arm that swings by the tension of a wire rod and the spring force of a tension coil spring, and the wire rod running on a guide pulley of this tension arm is loosened or broken. Is being prevented. A typical example thereof is a tension adjusting device proposed in Japanese Patent Application No. 6-27498 and drawings. 4 and 5 show the above-described conventional tension adjusting device, FIG. 4 is a top view of the tension adjusting device with some parts omitted, and FIG. 5 is a front view of FIG.
The tension adjusting device 1 has a main body part made of a flat plate-shaped steel plate and a fixed housing 2 formed with a return piece that is folded back from the main body part to the rear side. Upper hook guide 3 on the upper right side of the front view.
And a wire retainer 4 having a pair of ceramic plates pressed and overlapped by a compression coil spring is attached. On the left side of the wire retainer 4, a tension pulley 5 having an O-ring fitted in the V groove is arranged. The tension pulley 5 is mounted on the back surface of the fixed housing 2 by being fitted to the tip of the rotary shaft of the air gap type braking device 6 and fixed by a headless screw.

A virtual line A connecting the center point of the line retainer 4 and the center point of the tension pulley 5 (in other words, the center point of the rotating shaft of the braking device 6) and a straight line intersecting between these center points are A tension arm 7 is provided. The tension arm 7 is formed by stamping a flat steel plate into a rectangular shape, and one end of the tension arm 7 is swingably supported by a main body of the fixed housing 2 with a screw through a collar. A guide pulley 8 is rotatably supported on the other end of the tension arm 7.

In the tension arm 7, one hook is formed by cutting and raising the fixed housing 2 and the first tension coil spring 10 is hooked on a hooking portion 9 formed by cutting and raising the fixed housing 2. The other hook of each of the second tension coil springs 12 hooked on the hooked portion 11 is hooked. These first tension coil spring 10 and second
The tension coil springs 12 are coil springs having the same material diameter, total number of turns, and free length, and are arranged in series via tension arms 7 so that the center lines of the springs coincide with each other. Reference numeral 13 is a screw screwed and fixed to the fixed housing 2 as a stopper of the tension arm 7, and reference numeral 14 is a lower hook guide attached to the fixed housing 2. In the tension adjusting device 1 having the above-described structure, the filament material B is passed through the upper hook guide 3 and the wire retainer 4 and hung on the tension pulley 5 and the guide pulley 8 and then led from the lower hook guide 14 to a loom or the like. To be done. Further, since the braking force of the braking device 6 is applied to the traveling linear material B, the traveling linear material B travels while maintaining a constant tension without sagging.

If an abnormal tension acts on the linear material B for some reason, the tension arm 7 and the guide pulley 8 rotate due to the abnormal tension against the spring force of the first tension coil spring 10. However, when such an abnormal tension fluctuation (instantaneous fluctuation) occurs in the linear material B, the series spring composed of the first tension coil spring 10 and the second tension coil spring 12 arranged in series balances out. It bends instantly when it breaks, mitigating the effects of tension fluctuations. When the abnormal tension disappears, the relative spring force between the first tension coil spring 10 and the second tension coil spring 12 stabilizes at a position in equilibrium with the braking force of the braking device 6, and a constant tension is applied to the linear material B. to continue. Further, when the abnormal tension of the linear material B disappears, the guide pulley 8 is moved to the original position by the spring force (self-restoring force) of the first tension coil spring 10, but the guide pulley 8 and the tension arm 7 are moved to the first position. The balance of the first tension coil spring 10 and the second tension coil spring 12 limits the rest position.

As described above, in the conventional tension adjusting device 1, the guide pulley 8 is freely rotatable on the virtual line connecting the center point of the wire presser 4 and the center point of the tension pulley 5 and the straight line intersecting between these center points. The tension arm 7 supported by the above is swingably arranged, and the rest position of the tension arm 7 is limited in addition to the first tension coil spring 10 for mitigating the influence of the tension fluctuation of the linear material B. Since the second tension coil spring 12 is configured, the wire rod B is disconnected due to the large spring force of the first tension coil spring 10 or the wire rod B is loosened or disconnected due to the vibration of the tension arm 7 and the stopper 13. There is nothing to do.

[0007]

However, the vibration is applied to the tension arm 7 such as the vibrations of the tension coil springs 10 and 12 arranged in series caused by the abnormal tension of the filament B and the transient fluctuation of the predetermined tension. For example, the fiber thread hung on the pulley 8 may be broken,
Depending on the type of the filament material B, it is difficult to say that the tension adjusting device is satisfactory.

Further, it is known to detect the position of the tension arm 7 which rotates due to the fluctuation of the tension of the linear member B to electrically control the braking force of the tension pulley 8, but an electromagnetic braking device, for example, an electromagnetic hysteresis. When a current is linearly supplied to the electromagnetic coil of the brake, the tension arm 7 vibrates due to the delay of the current due to the inductance of the coil and the delay of the braking torque, and the slack and disconnection of the fiber yarn B due to this vibration are also regarded as problems. Was there. It is an object of the present invention to provide a tension adjusting device that is optimal for adjusting the tension of a filament material such as a fiber thread that is relatively easily broken.

[0009]

In order to achieve such an object, the tension adjusting device of the present invention is provided with a guide member on which a linear member is hung, and the tension of the linear member and the tension coil spring The invention is characterized in that a tension arm that is swung by a spring force and a buffering means that damps the swing of the tension arm are provided (invention 1). Further, the buffering means is a damper device having a tooth portion that meshes with a tooth portion provided on the periphery of the support portion of the tension arm (invention 2). Still further, the damper device is
A viscous damper device having a rotating shaft provided with the teeth and a viscous fluid for braking the rotating shaft is provided (invention 3).

Further, in the tension adjusting device of the present invention, a tension pulley attached to an electromagnetic braking device for applying a constant tension to the linear material and a guide member for hanging the linear material are provided, and the linear material is provided. The tension arm that is swung by the tension force of the tension coil spring and the spring force of the tension coil spring and the buffering means that damps the swing of the tension arm are arranged to electrically insulate the frequency signal generated by the pulse generator and to F / V. A differential amplifier circuit for comparing the converted set voltage signal and a feedback voltage signal obtained by amplifying a voltage proportional to the rotational displacement of the tension arm via a differentiating circuit, and a differential output circuit of the differential amplifier circuit. A control circuit including a constant current drive circuit of the electromagnetic braking device for converting into a current is provided (invention 4).

[0011]

[Function] Pre-tension (initial tension) for filament materials such as fiber threads by the wire pressing and the guide member of the tension arm.
Is applied to the tension pulley in a state where the tension pulley is applied and runs toward the drum of the warper so that a predetermined tension is applied by the braking torque of the electromagnetic hysteresis brake to which the tension pulley is mounted. Due to the change in tension of the wire material, the tension arm rotates while being braked by the viscous damper device. Further, the rotation of the tension arm electrically controls the braking torque of the electromagnetic hysteresis brake.

[0012]

1 and 2 show an embodiment of the tension adjusting device of the present invention. FIG. 1 is a partially omitted top view and FIG. 2 is a front view. Embodiments of the apparatus will be described below with reference to these drawings. The tension adjusting device 15 is composed of a flat steel plate and has a main body portion 16a on the front and a mounting portion 16b which is folded back from the main body portion 16a to the rear side.
6, an upper hook guide 17 is fixed to the upper right side of the main body portion 16a of the fixed housing 16 when viewed from the front, and a pair of dish-shaped plates pressed and overlapped by a compression coil spring 18 wound in a conical shape. The tension washer 19 as a wire holder composed of the washer of the support shaft (screw) 20
It is rotatably supported by. As is well known, the tension washer 19 is a running fiber yarn so that a constant pre-tension (initial tension) is always applied regardless of the surface state of the fiber yarn B (state such as thickness and fluff) and yarn speed. B
It is a line holder that holds in.

A tension pulley 22 fitted with an O-ring 21 for increasing the frictional engagement force between the running fiber thread B and the V groove is disposed above the left side of the main body portion 16a of the fixed housing 16 in a front view. Has been done. The tension pulley 22 is attached to the tip of a rotary shaft 24 of an electromagnetic braking device 23 mounted on the back side of the main body 16a of the fixed housing 16 by being fixed by a headless screw.
The electromagnetic braking device 23 has a field core 26 internally provided with an electromagnetic coil 25 and screwed to the main body portion 16a of the fixed housing 16. A magnetic circle press-fitted into the outer pole side opening of the field core 26. The plate 27 and the magnetic cylindrical member 28 press-fitted into the inner circumference of the field core 26 on the inner pole side.
A cylindrical portion of a rotor 30 made of a hysteresis material, which is fixed to a hub 29 axially attached to the rotating shaft 24, is loosely fitted in an annular space S formed between the magnetic pole portions of the. That is, the electromagnetic braking device 23 is an electromagnetic hysteresis brake, which cuts off the magnetic field in the air gap S generated by energizing and exciting the electromagnetic coil 25 while rotating the rotor 30, the hub 29 ,.
The rotary shaft 24 is adapted to rotate.

The tension adjusting device 15 is similar to the conventional tension adjusting device 1 on a virtual line connecting the center point of the tension washer 19 and the center point of the tension pulley 22 and a straight line intersecting between these center points. , Tension arm 31
Is arranged to be swingable. This tension arm 3
Reference numeral 1 denotes a plate-shaped steel plate which is stamped into a rectangular shape. A tooth portion 32 is formed on the periphery of the fulcrum side, and a guide pulley 34 as a guide member is rotatably supported on the force point side. There is. Alternatively, a gear may be separately prepared, and the tension arm 31 may be swingably supported by the support shaft 33 together with the gear. Such a tension arm 31
Is pulled in a direction opposite to the rotation direction of the timepiece by the initial spring force of the tension coil spring 35, and abuts on the stopper piece 36 formed by cutting and raising the main body portion 16a of the fixed housing 16. .

A viscous damper device 38 having a gear 37 that meshes with the tooth portion 32 of the tension arm 31 is fixed to the main body portion 16a as a damping means for damping the swing of the tension arm 31. The viscous damper device 38 is filled with a viscous fluid in an airtight container, and a gear 37 is attached to a tip of the viscous damper device 38 protruding from a container of a rotating shaft to which a blade for stirring the viscous fluid is fixed. In FIGS. 1 and 2, reference numeral 39 indicates the support shaft 3 of the tension arm 31.
A potentiometer as a position detector connected to the reference numeral 3, and a reference numeral 40 is a stopper piece for limiting the movement of the tension arm 31 in the rotation direction of the timepiece when viewed from the front. Reference numeral 41 is a lower hook guide.

Next, a control circuit of the tension adjusting device having the above structure will be described with reference to the circuit diagram of FIG.
The tension adjusting device 15 described above is a device for applying a constant tension to each raw yarn when winding the raw yarn from the creel in which a large number of bobbins around which the raw yarn is wound is wound on the drum of the warper. The tension adjusting devices are arranged by the number of the original yarns. Therefore, the wiring distance between the power supply and the electromagnetic coil 25 of the electromagnetic hysteresis brake 23 becomes very long, and variations in the braking torque of each electromagnetic hysteresis brake 23 due to power loss are observed. Therefore, in the control circuit of this embodiment, multi-drop Frequency command batch control by connection is used. That is, the wiring distance is shortened by receiving the frequency signal from the pulse generator 42 by the control circuit of each tension adjusting device 15 which is connected in parallel and is adjacent.

In the tension command input circuit 43, the phototransistor side of the photocoupler 46, which is connected to the pulse generator 42 through the resistor 44 and the light emitting diode 45, is grounded to the 5V (VL) power supply line converted by the power supply circuit 47. The photocoupler 46 is connected to the line and receives the frequency signal from the pulse generator 42 in an insulated manner. In addition, the reception is performed by the light emitting diode 45.
I am trying to display it. Photo coupler 46 and F / V
Only the signal component of the frequency signal whose pass band is limited by the low-pass filter circuit 48 formed of a resistor and a capacitor connected to the conversion IC 50 passes to the F / V conversion circuit 49.

The F / V conversion circuit 49 comprises an FV conversion IC 50 (power supply is omitted) and a CR circuit for determining a time constant in order to convert a frequency signal into an analog voltage.
For example, the input voltage of 1 kHz is set to convert the output voltage of 1 V. The voltage proportional to the command value output from the F / V conversion circuit 49 is the differential amplifier circuit 51.
Is added to the (+) input of the operational amplifier 52 of. In addition, on the (−) input side of the operational amplifier 52 of the differential amplifier circuit 51,
An output voltage of an overexcitation control circuit 55, which will be described later, and a voltage fed back from the constant current drive circuit 58 are added.

On the other hand, this control circuit is provided with a feedback control circuit 53 for fluctuations in the tension of the fiber yarn B. The feedback control circuit 53 includes a tension detection circuit 54 and an overexcitation control circuit 55. The tension detection circuit 54 includes a potentiometer 39 as a position detector connected between the 5V power supply line and the ground line.
And an operational amplifier 56 are provided, the (+) input of the operational amplifier 56 is connected to the output terminal of the potentiometer 39, the (−) input is connected to the output of the operational amplifier 56, and the overexcitation control circuit 55 and the disconnection detection circuit 57 are connected. Has been done. By the rotational displacement of the tension arm 31, the high impedance output of the potentiometer 39 corresponding to the reference voltage by the variable resistor is converted into a low impedance output by the voltage follower circuit of the operational amplifier 56.

The overexcitation control circuit 55 is composed of, for example, a differentiating circuit utilizing charging / discharging of a CR circuit or an amplifying circuit whose amplification factor can be changed by a variable resistor which can be manually switched. That is, the voltage output from the differential circuit when the tension arm 31 rotates is added to or subtracted from the output voltage proportional to the rotational position of the tension arm 31 whose impedance is converted by the tension detection circuit 54, and the electromagnetic hysteresis brake 23 Excessive current control is applied to prevent a delay in braking operation that occurs when a current is linearly supplied to the electromagnetic coil 25. Further, by changing the addition / subtraction amount of the differential component due to the rotation of the tension arm 31 in accordance with the desired tension which varies depending on the type of the fiber yarn B, an overexcitation current corresponding to the type of the fiber yarn B flows in the electromagnetic coil 25. Then, the braking torque is controlled so as not to change suddenly.

The voltage controlled by the overexcitation control circuit 55 is added with a voltage proportional to the current flowing from the constant current drive circuit 58 to the electromagnetic coil 25, and the (-) of the operational amplifier 52 of the differential amplifier circuit 51 described above is added. Added to the input terminal, F
The voltage is compared with the voltage set by the / V conversion circuit 49.
Then, the difference of the differential amplifier circuit 51 is output to the constant current drive circuit 58. Further, the transistor 59 of the constant current drive circuit 58 is amplification-controlled, and a current is supplied to the electromagnetic coil 25 of the electromagnetic hysteresis brake 23.

Next, the disconnection detection circuit 57 will be described. In this control circuit, the output of the potentiometer 39 is compared with the variable reference value to judge the disconnection of the fiber yarn B from the position of the tension arm 31. In addition, the disconnection determination result is insulated by the photocoupler 60 and output by the open collector method, and the light emitting diode 6
The disconnection is indicated by 1.

Tension adjusting device 1 having the above structure
After the fiber yarn B passes through the upper hook guide 17 and the wire retainer 19 and is hung on the tension pulley 22 and the guide pulley 34, the fiber 5 is guided from the lower hook guide 41 to the drum of the warper. Since the drum of the warper rotates when the power is turned on and the electromagnetic coil 25 is energized, the tension of the fiber yarn B is adjusted by the tension adjusting device 15 while the tension is kept constant by the braking torque of the electromagnetic hysteresis brake 23. To drive. Furthermore, the tension arm 34, which supports the guide pulley 34 on which the fiber yarn B runs, is rotated to the state shown by the solid line in FIG. 2 against the spring force of the tension coil spring 35.

When an abnormal tension acts on the fiber yarn B for some reason, the tension arm 31 is rotated in the clockwise direction against the spring force of the tension coil spring 35 due to the abnormal tension. The current supplied to the electromagnetic coil 25 is adjusted by the control circuit including the potentiometer 39. Then, the braking torque of the electromagnetic hysteresis brake 23 decreases, and the tension applied to the fiber yarn B is weakened.
When the abnormal tension disappears, the tension arm 31 is rotated in the direction opposite to the clockwise rotation direction by the self-returning force of the tension coil spring 35, so that the braking torque of the electromagnetic hysteresis brake 23 increases and the fiber yarn The tension applied to B is strengthened. In addition, when the tension arm 31 reaches the position shown by the solid line in FIG.
The braking torque of 3 becomes the initial set value.

Due to such abnormal tension and disappearance of this abnormal tension, the tension coil spring 3 is attached to the tension arm 31.
Although the vibration caused by 5 and the vibration caused by electric control act,
The vibration of the tension arm 31 is absorbed by viscous resistance of the viscous damper device 38 provided as a cushioning means, so that the vibration is absorbed. Therefore, the fiber yarn B is not loosened or broken. Further, the balance caused by the tension of the fiber yarn B and the self-returning force of the tension coil spring 35 is broken, and the tension arm 31 is moved to the stopper pieces 36, 40.
However, since the tension arm 31 is hit against the stopper pieces 36 and 40 while the rotation of the tension arm 31 is braked, the shock is mitigated.

In the above description, the rotary viscous damper device which meshes with the fulcrum side of the swinging tension arm 31 as the cushioning means has been exemplified, but a piston type viscous damper device or the like can also be used. In addition, the tension arm 31
The damping force of the viscous fluid was obtained by the viscous fluid.However, the damper device has a shear resistance by stirring magnetic powder magnetized by a permanent magnet and a circle of a hysteresis material provided in the magnetic field of the permanent magnet. It is also possible to use a permanent magnet damper device or the like that uses a pole induction resistance to draw a hysteresis curve on the plate. Furthermore, a mechanical damper device or the like that presses the friction plate toward the fulcrum of the tension arm 31 may be used. Further, even if the buffer means is provided in the conventional tension adjusting device 1, the same effect as the tension adjusting device 15 can be obtained.

Further, in the present invention, a concrete control circuit is shown as an embodiment, but the present invention is not limited to that embodiment, and in the electromagnetic braking device, in addition to the electromagnetic hysteresis brake, an electromagnetic powder brake or the like may be used. You can also do it.

[0028]

As described above, in the tension adjusting device according to the first aspect of the present invention, the guide member on which the linear member is hung is provided, and is swung by the varying tension of the linear member and the spring force of the tension coil spring. Since the tension arm and the cushioning means for damping the swing of the tension arm are arranged, the abnormal tension of the wire or the vibration of the swinging tension arm due to the disappearance of the abnormal tension is absorbed and suppressed. The tension of the filament material such as thread is maintained with high accuracy against the set value,
Moreover, loosening and disconnection can be prevented.

Further, in the tension adjusting device of the second aspect of the present invention, since the cushioning means is the damper device having the tooth portion formed to engage with the tooth portion formed on the peripheral edge of the support shaft of the tension arm, the tension arm and the damper device are connected. The tension adjusting device can be provided inexpensively because it is easy and the entire device can be designed in a small size.

Furthermore, in the tension adjusting device of the present invention 3,
Since the damper device is a viscous damper device with viscous fluid, the braking force of the tension arm can be finely adjusted by the viscosity of the viscous fluid, and a stable braking force can always be applied to the tension arm, so high-quality tension The adjusting device can be provided at low cost.

Further, in the tension adjusting device of the present invention 4, a tension pulley mounted on an electromagnetic braking device for applying a constant tension to the linear material and a guide member for hanging the linear material are provided, and the linear material is provided. A tension arm that is swung by the tension of the material and the spring force of the tension coil spring and a buffering means that damps the swing of this tension arm are arranged to electrically insulate the frequency signal from the pulse generator and to F / V
A differential amplifier circuit for comparing the converted set voltage signal and a feedback voltage signal obtained by amplifying a voltage proportional to the rotational displacement of the tension arm via a differentiating circuit, and a differential output circuit of the differential amplifier circuit. Since the control circuit is composed of the constant current drive circuit of the electromagnetic braking device that converts the current, the voltage output from the differentiating circuit is added to or subtracted from the output voltage proportional to the rotation position of the tension arm, and excessive current control is performed. Therefore, the delay of the current and the delay of the braking torque due to the inductance of the coil when the current is supplied to the electromagnetic braking device is reduced, and the vibration of the tension arm is suppressed.

Further, the set voltage signal obtained by F / V conversion by electrically insulating the frequency signal generated by the pulse generator is compared with the feedback voltage signal obtained by amplifying the voltage proportional to the rotational displacement of the tension arm through the differentiating circuit. Since a differential amplifier circuit is provided, a control circuit for a tension adjusting device or the like arranged in order to wind the raw yarn rewound from each bobbin of the creel onto the warping drum has a problem of power loss. It is possible to obtain practically great effects such as being solved.

[Brief description of drawings]

FIG. 1 is a top view of a tension adjusting device that is an embodiment of the present invention.

FIG. 2 is a front view of the tension adjusting device of FIG.

FIG. 3 is a control circuit diagram of a tension adjusting device according to an embodiment of the present invention.

FIG. 4 is a top view of a conventional tension adjusting device.

5 is a front view of the tension adjusting device of FIG. 4. FIG.

[Explanation of symbols]

15 ... Tension adjusting device, 19 ... Wire retainer, 22 ... Tension pulley, 23 ... Electromagnetic braking device, 25 ... Electromagnetic coil, 3
DESCRIPTION OF SYMBOLS 1 ... Tension arm, 32 ... Tooth portion, 34 ... Guide pulley, 35 ... Tension coil spring, 37 ... Gear, 38 ... Damper device, 42 ... Pulse generator, 43 ... Tension command input circuit, 49 ... F / V conversion circuit , 51 ... Differential amplifier circuit,
53 ... Feedback control circuit, 54 ... Tension detection circuit, 55 ... Overexcitation control circuit, 57 ... Disconnection detection circuit, 5
8 ... Constant current drive circuit.

Claims (4)

[Claims] 1. A tension arm provided with a guide member on which a linear member is hung, which is oscillated by the tension of the linear member and a spring force of a tension coil spring, and a cushioning means for damping the oscillation of the tension arm. A tension adjusting device comprising: 2. The tension adjusting device according to claim 1, wherein the buffering means is a damper device having a tooth portion that meshes with a tooth portion provided on the peripheral edge of the support portion of the tension arm. 3. The tension adjusting device according to claim 2, wherein the damper device is a viscous damper device having a rotating shaft provided with the tooth portion and a viscous fluid for braking the rotating shaft. 4. A tension pulley mounted on an electromagnetic braking device for applying a constant tension to a linear material, and a guide member on which the linear material is hooked are provided, and the tension of the linear material and a tension coil spring are provided. A tension arm that is swung by a spring force and a buffering means that damps the swing of the tension arm are arranged, and a set voltage signal obtained by F / V converting the frequency signal from the pulse generator by electrically insulating it is provided. A differential amplifier circuit that compares a voltage proportional to the rotational displacement of the tension arm with a feedback voltage signal amplified through a differentiating circuit, and the electromagnetic braking that converts the voltage proportional to the output voltage of the differential amplifier circuit A tension adjusting device comprising a control circuit including a constant current drive circuit of the device.