KR840000320B1 - Apparatus for controlling a thread storage and feeder device - Google Patents

Abstract

Control is for storage and feed of a thread to a processing machine, the amount stored being received on a drum acting as a buffer store unit and a corresponding signal generated. The speed of a thread-winding motor is controlled dependent on this signal. The motor speed control signal generated depends both on the amount of thread stored and the actual consumption rate. With the min. and max. permissible amounts of thread stored the motor can be driven at max. and min. speed respectively, while between these two conditions its speed is controlled by a signal derived from the actual consumption rate.

Description

Control of Seal Storage Supply

1 is a block diagram of one embodiment of the present invention.

2 is a detailed circuit diagram according to the block diagram shown in FIG.

3 is a pulse diagram illustrating the operation of the circuit shown in FIG.

The present invention relates to a device for controlling a thread storage and supply device for a thread processor, the rotation of the motor for sensing the thread supply amount of the drum serving as the intermediate storage of the thread and generates a signal to wind the thread on the drum It relates to a device for controlling the speed.

In textile looms such as looms or knitting columns, the yarns are generally fed from a supply bobbin. In this type of loom, for example, most of the looms used in modern times, the yarn is not consumed at a constant speed, and there is a case where a rapid shock supply of the yarn is caused by the injection of air or water or by a mechanical thread guide member.

The rapid loosening of the thread from such bobbin is caused by the fact that the thread loosens due to the bad shape and position of the bobbin and the fact that the bobbin size decreases when the thread is released. It is difficult to obtain and results in the thread being easily broken by the stoplight of the loom. In order to remedy this drawback and to supply a certain amount of yarn to the loom, a so-called yarn feeder, i.

In such a yarn storage supply device, a winding member driven by an electric motor is used to wind the yarn on a stationary yarn storage drum. Thus, the drum is wound around the drum to form the required intermediate storage of the yarn, from which the loom draws the instantaneous demand for the yarn.

In order to match the speed at which the thread is wound on the drum with respect to the speed at which the thread is released, it is generally controlled to an intermediate storage amount of the yarn wound on the drum so that the supply of such yarn is maintained within some limited range. DE-OS 1809091 describes a yarn feeder consisting of an optical sensing device for increasing or decreasing the drive motor when the intermediate storage of the yarn reaches the lower limit (a) or the upper limit (b). In the middle line c between the two ranges (a) and (b), the motor is controlled by a constant control signal so that the yarn is wound around the drum at a constant speed. In practice, however, the initial starting speed is different from the speed at which the thread is constantly wound on the drum, so the amount of storage of the yarn wound on the drum within the midline (c) tends to deviate towards the lower limit (a) or the upper limit (b). This will be. For example, if the thread is initially released from the intermediate storage of the drum at a speed faster than the speed at which it is wound on the drum, the actual storage on the drum will be shifted from the range of the middle line (c) to the lower limit (a).

As soon as the actual storage reaches the lower limit (a), the motor speed is increased and the actual storage is refilled. Depending on the inertia of the device, the actual stock may fill up above the midline c, at which time the speed of the motor is reduced again. However, this change in the amount of yarn storage and winding speed on the drum causes a change in the tension of the supplied thread, which leads to a change in the quality of the textile products produced in the looms to which such yarn storage class devices are connected.

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for controlling a yarn storage and supply device to remedy the above drawbacks and to automatically adjust the winding speed of a yarn according to the actual yarn consumption.

The object of the present invention in the above-mentioned apparatus can be achieved by generating a control signal for controlling the rotation speed of the motor which depends on the actual storage amount and the actual actual consumption and the actual actual consumption.

Unlike the methods used so far, the device according to the invention takes into account the speed at which the seal is released from the storage drum. Considering the actual thread consumption while adjusting the rotational speed of the motor can be said that the motor rotational speed can be matched to the consumption of the yarn, which is a substantial improvement over the conventional apparatus. The intermediate storage and actual storage of the present invention are thus kept small while meeting the above mentioned requirements.

In one embodiment of the invention, the motor is driven such that its rotational speed is at its maximum or minimum when the actual storage amount on the drum is within the lower limit (a) or the upper limit (b), and the rotational speed of the motor is at the lower limit (a). In the case, the yarn is controlled by a control signal according to the actual yarn consumption, so that the yarn is replenished quickly. On the other hand, if the drum is sufficiently stored in the drum, the speed of the motor is greatly reduced or stopped. Since the control of the actual consumption is considered, the motor is driven at the rotational speed according to the actual consumption when the actual storage amount is between the two limit lines. The motor's rolling speed in the stationary state substantially corresponds to the consumption of the yarn, ie the speed at which the yarn is withdrawn from the storage drum. In this case, the unnecessary tension change of the thread is not completely eliminated.

In an apparatus for controlling the rotational speed of the winding member of the yarn storage and supply apparatus for a yarn processing apparatus including a drum for preliminarily storing the yarn supplied from the yarn supply bobbin, an electric motor for driving the yarn winding member. And a sensing means for sensing an amount of the preliminarily stored yarn on the drum, and connected between the sensing means and the electric motor, so that the motor at the lower limit line (a), upper limit line (b) and the middle line (c) of the preliminary storage amount. Consisting of signal processing means for generating different output signals for controlling the rotational speed of the medium, wherein the intermediate line (c) representing the intermediate range of the actual storage amount before the lower limit line (b) or the upper limit line (a) And a signal correction means for storing the output signal value used in the line (c) and the signal processing means stored in the signal correction means when the actual storage amount reaches the lower limit line (a) or the upper limit line (b). It is characterized by correcting the output signal value.

The device according to the invention automatically adjusts the winding speed of the yarn to the actual consumption by compensating step by step the control signal for the motor. If the storage capacity of the yarn in the apparatus of the present invention is directed out of the middle line (c) to the upper limit line (b), the motor's rotation speed is still fast, but the automatic stepwise reduction until the rotation speed is adjusted to the correct thread consumption. Regulation is made from time to time. The width of this step will be proportional to or a function of the period of time during which the supply of yarn is at the lower limit (a) or the upper limit (b).

Referring to the present invention in more detail based on the accompanying drawings as follows.

1 shows a schematic diagram of a seal feeder 1 including a known motor 2. The seal 38 is wound on the seal storage drum 3 by a winding member 3 'driven by the motor 2 and the seal 38 is conveyed through the hollow shaft of the device. Depending on the consumption of the yarn, the yarn is withdrawn from the drum onto the take-up member 3 'and fed to the yarn processor associated with this apparatus. The ring 4 disposed on the drum 3 moves in accordance with the storage amount of the seal storage portion 34 and the indicator element 6 is moved by the rod 5 connected to the ring 4.

The sensing elements 7 and 8 are provided. In the embodiment described here, the sensing elements 7, 8 comprise a light emitting diode 9 which sends light to the phototransistor 10 and the phototransistor 10 is arranged in the vicinity of the light emitting diode 9. . If the indicator element 6 comes between the pair of diodes 9 and the phototransistor 10, an output signal is generated to indicate the position of the indicator element 6. The output signal of the sensing elements 7 and 8 is sent to the signal generator 11, which generates one voltage level signal among three voltage levels corresponding to the position of the indicating element 6, The voltage level of the world indicates that the actual storage amount of the actual storage 34 is in the range of the lower limit line a, the upper limit line b, or the middle line c.

The output signal of the signal generator 11 is applied to the forming circuitry 14 via the lead 13. The output of the forming circuit 14 is connected to the input of the integrator 16 via a lead 15. The output of integrator 16 is applied to adder 18 via lead 17. The second input of the adder 18 receives the output signal of the pulse generator 20 which generates a triangular pulse via the lead 19. In this embodiment, the triangular pulse generator is configured as a sawtooth wave generator.

The lead 13 is connected to the first input of the comparator C18 through the branched lead 21. The second input of comparator C18 is connected to the output of adder 18 with lead 18A. The output of the comparator C18 is connected to the drive circuit 27 through the conductive line 27A. The output signal of the drive circuit 27 controls the voltage applied to the motor. That is, the output signal of the drive circuit 27 controls the rotation speed of the motor.

Before detailed description of the diagram shown in FIG. 1, a detailed circuit diagram of this apparatus is described in FIG.

Two sensing elements 7 and 8 are shown at the top of FIG. Each sensing element 7, 8 is a pair of light emitting diodes 9 and a phototransistor 10, respectively. The sensing elements are arranged such that the light rays emitted from the diode 9 reach and operate on the phototransistor 10. The indicator element 6 forms a square wall. The signal generator 11 generates an output signal which takes one of three voltage levels depending on whether one light emitting diode 9 is covered by the indicator element 6 or which light emitting diode 9 is not covered. Details of the sensing element are clearly shown in the drawings, and thus detailed descriptions are omitted. This is because only the output signal generated is important for understanding the circuit according to the present invention.

The forming circuit 14 is composed of a diode 14a and its cathode is connected to the output side lead 13 of the circuit 11. A circuit composed of a diode 14b connected in parallel with the diode 14a and a large densa 14d connected in series therewith is connected.

The output signal of the forming circuit 14 is sent to the integrator 16. The integrator is composed of an input resistor 16a, an operational amplifier OP16, and an integrating capacitor 16b which connects one input and an output of the operational amplifier.

Sawtooth generator 20 is shown on the right side of FIG.

The pulse generator's output pulse is 10Hz and its amplitude is + 5 ~ -5 volts. The sawtooth wave generator or the triangular wave pulse generator of this type is known per se, and the design or function of such a circuit can be easily understood by those skilled in the art, and thus the detailed description thereof will be omitted.

The output signal of the sawtooth wave generator 20 is applied to the resistor 20a and then to one side terminal of the resistor 18a. The other terminal of the resistor 18a is connected to the output of the operational amplifier OP16. Resistor 18a is connected to one input of comparator C18 with lead 18A. As another input of the comparator C18, an output signal of the circuit 11 is applied through the conductive line 21.

The output of the comparator C18 is applied to the base of the transistor TR1 of the drive circuit 24. The output of the comparator C18 becomes a high level or a low level depending on the characteristics of the two input signals.

The output of the drive circuit 24 is connected to the photoelectric connection means 25. This photoelectric connecting means includes a phototransistor 25a disposed in the vicinity of the light emitting diode 25a and the diode 25a.

This non-electrical connection is effective in removing the interference of the electronic control circuit substantially. The output shaft of the photoelectric coupler is connected to a drive circuit 27 composed of three thyristors 28. Each thyristor drives one phase of the motor 2 of the seal supply device 1. As will be apparent to those skilled in the art, the thyristors 28 operate according to the conduction time of the transistor TR1, so that high or low rotations of the motor are achieved.

The following describes the operation of the above-mentioned circuit by FIG. 3 shows the characteristics of different signals at different times. The time axis is shown at the bottom of FIG. 3, and the points of interest related to the present invention are indicated by the reference marks t ₁ -t ₁₁ . The interval between t _{5 and} t ₆ has been omitted, indicating that this interval is very long in normal operation. FIG. 3a shows the average speed at which the yarn is drawn out of the intermediate storage by the loom, ie the actual yarn consumption. If the amount of yarn stored on the drum decreases due to an increase in yarn consumption before time, the indicator element 6 no longer covers the light emitting diode 9 indicating that the supply amount is at the upper limit b. Accordingly, the output signal of the circuit 11 falls from the high level V to the intermediate level n, that is, 0 volts. When the actual storage amount of the drum reaches the lower limit a at time t ₂ , the output signal of the circuit becomes a negative level as shown in FIG. 3B.

The forming circuit 14 generates a sub-signal at time t ₂ and the sub-signal is sent to the integrator 16. This circuit is designed so that the output signal of the integrator 16 can be increased when a negative voltage is applied to the input. From the type of pulse train (Fig. 3C), the circuit 14 has a predetermined width every time the output voltage of the circuit 11 changes to bring it to a positive level as shown at times t ₆ , t ₈ and t ₁₀ . It can be seen that it generates a pulse of.

The increase in output voltage of integrator 16 may be controlled by the corresponding magnitude of integrator 16 or forming circuit 14. In the signal comparison of FIG. 3C and FIG. 3D, the output voltage of the integrator 16 is decreased when the signal of FIG.

The advantage of the circuit 14 in which a constant pulse of a predetermined width is generated is evident when considering the case where the seal 38 breaks downstream of the feeder 1. When the thread breaks, the loom stops and the thread of the drum 3 is supplied to the maximum, so that the signal of FIG. 3 is sent to the integrator 16 and the output voltage is enhanced to zero. After the operation of the loom is resumed again (with the same actual consumption as before), the output signal of the integrator 16 has a small amplitude which does not match the actual actual consumption. The circuit 14 allows the output of the integrator 16 to be maintained during the time when the loom is stopped.

The output signal of the sawtooth generator 20 is shown in FIG. 3f. The signals of Figs. 3d and 3f are added by the adder 18 to generate this addition signal. This signal is sent to the low input and output of the comparator C18 via the conducting wire 18A.

As another input of the comparator C18, a reference signal is sent through the conductive line 21. When the signal of the conductive wire 21 is at the zero level, if a voltage higher than the reference input is sent to the other input of the comparator C18, that is, a voltage greater than zero is sent to the other input, the output of the comparator C18 has a positive level. Will be. Therefore, the addition signal is continuously compared with the reference signal of the conductive line 21. If the reference signal is at the level as shown by arrow P in FIG. 3d, comparator C18 generates an output signal whenever the addition signal is higher than the level in this reference. From the form of the addition signal, the longer the output signal of the comparator C18 is at a high level, the higher the output voltage of the integrator is. In this case, the sawtooth signal rises accordingly and lengthens to the reference level. The resulting control voltage is shown by lines in FIG. 3e. As shown in FIG. 3E, the effective motor voltage is high when the output signal of the integrator 16 is high.

If the actual storage amount on the drum reaches the lower limit a, negative pulses are generated in the conductive wire 21. This causes the other input of the comparator C18 to be at a relatively high level so that the comparator C18 generates a high output signal so that the motor 2 is driven at the maximum rotational speed for the entire time when the negative pulse appears on the conductive wire 21. Do it. Therefore, the yarn is replenished quickly when the yarn storage amount on the drum reaches the lower limit (a). On the contrary, when the actual storage amount on the drum reaches the upper limit b, a positive signal will appear on the conductive line 21 to generate a positive reference signal. The positive reference signal causes the other input of the comparator C18 to which the addition signal is sent to be lower than the reference signal, thereby generating an unfamiliar level voltage at the output of the comparator. Therefore, the rotation speed of the motor 2 is switched to the minimum. That is, the motor stops completely to prevent the thread from being wound on the drum anymore.

The actual storage is at the lower limit (a) (t ₂ -t ₃ ; t ₄ -t ₅ in FIG. 3) or the upper limit (b) (t ₆ -t ₇ ; t ₈ -t ₉ ; t _{10 in} FIG. In the time zone in-t ₁₁ ), the motor 2 is controlled to the selected maximum minimum voltage (see also FIG. 3e). In the time zone where the actual stock is in the middle line (c) (t ₁ -t ₂ ; t ₃ -t ₄ ; t ₅ -t ₆ ; t ₉ -t ₁₀ in Figure 3), the motor (2) is the comparator (C18). Is controlled by the output of the circuit, and in this time the signal of the integrator 16 is reversed. This output signal is not constant but varies with actual actual consumption. As shown in detail in FIG. 3B, the output signal of the integrator 16 is increased in the time zone in which the actual storage amount is at the lower limit (a) and decreased in the time zone in the upper limit (b). Therefore, the output signal of the integrator 16 is used to control the motor in continuous time zones in which the actual storage amount is in the middle line c. In the output signal of the integrator 16, the increase amount depends on the time when the actual storage amount is at the lower limit (a), and the decrease in time during which the actual storage amount is at the upper limit (b), depending on the function of the forming circuit 14 It is constant.

Use only a small pulse at the upper limit (b) or only at a very short time for a very short period of time if the actual storage has passed some limit and only a very short pulse is generated. In this case, it is good to allow even a small output pulse from the forming circuit to be canceled. This allows the yarn stock to be replenished as quickly as possible when the yarn stock is at the lower limit (b) to avoid spinning without feeding the yarn to the drum. It is not very important for the yarn stock to decrease quickly if the yarn stock is at the upper limit (b). Regardless of the time when the actual storage amount is at the upper limit (b), the control operation is facilitated by modifying the integrator signal in a constant small step.

An important part of the circuit shown in FIGS. 1 and 2 is that the output signal is controlled at a rotational speed at which the motor 2 can maintain the actual storage capacity of the middle line c so that the yarn is produced according to the actual consumption. It is an integrator that acts as a signal correction means to adjust to be wound around). After the start of operation or the correction of the actual consumption, the amount of storage of the thread increases. After a certain amount of time, if the amount of storage increases, the amount of storage reaches the upper limit (b) after some time and the rotational speed of the motor 2 is increased. The reserve is reduced to the minimum until it returns to the midline (c). During this time, the output signal stored in the integrator 16 is reduced to a predetermined step, and the motor 2 is controlled according to this newly corrected signal. If the rotational speed of the motor 2 is still too fast, the actual storage amount reaches the upper limit line b again and the motor 2 is controlled by the minimum control signal until the actual storage amount reaches the middle line c again. The reduced output signal of integrator 16 is used until the actual speed of rotation of motor 2 is completely matched. If the actual storage amount reaches the lower limit a, similar output signal correction of the integrator 16 is performed.

Sawtooth signal generator 20 is only used to simplify all circuit design. The saw-tooth wave generator has a constant amplitude as its output signal is added to the output signal of the integrator 16 of the adder 18 but is proportional to the difference between the output signal of the integrator 16 and the second input signal of the comparator C18. Is provided for the output signal of comparator C18 in the form of a pulse having a ratio between pulse time and non-pulse time. The amplitude of the output signal of the sawtooth wave generator 11 is an intermediate value or 0. The output signal of the signal generator 20 is not generated at the lower limit (a) or the upper limit (b) of which the output signal has a minimum or maximum value and the comparator (C18) The signal is generated at each of these maximums or maximums (see also section 3e).

Claims (1)

The forming circuit 14, the adder 18, and the comparator between the sensing elements 7 and 8 for sensing the amount of yarn pre-stored on the drum 3 and the motor 2 for driving the drum 3. C18) and a control device in which a circuit composed of the sawtooth wave generator 20 is connected, the output signal value used in the middle line (c) of the actual storage amount is stored and the actual storage amount is stored at the lower limit line (a) or the upper limit line (b). And an integrator (16) for correcting the stored output signal value at the time of connection.

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