JPH0192459A - Monitor apparatus of yarn feed - Google Patents

Abstract

PURPOSE: To provide a mechanism capable of accurately and continuously monitoring the feed of a yarn without needing an additional cost and deteriorating the mechanism of a yarn-feeding device in the kind of the electrically controlled yarn-feeding device. CONSTITUTION: The frequency of a step motor for rotating a yarn-feeding roller and/or the signals of a sensor for contactlessly scanning and detecting a rotary element sliplessly connected to a yarn are treated in the first measurement circuit 55. A target yarn tension value set and adjusted with the target value transmitter of an adjustment circuit attached to a yarn-feeding device is measured in the second measurement circuit 56. The first measurement circuit 55 transmits pulse frequency signals characterizing stepping pulse numbers and pulse frequency signals characterizing the inclement rotation movement of the rotation element. The second measurement circuit 56 transmits pulse frequency signals characterizing target yarn tension values each time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for monitoring the yarn feed in a yarn feed device for a textile machine, for example with a driven yarn feed roller for sliplessly feeding the yarn.

Prior art For example, in the case of multi-system circular knitting machines, in order to form products with high uniformity, at least the machine is set up so that the quantity of yarn fed per unit time to the individual circular knitting systems is The speed needs to be monitored to ensure that the same amount of yarn is processed on all circular knitting machines. In practice, a number of so-called yarn run measuring devices are used for this purpose. Depending on the model, this measuring device operates by means of a transmitter in the form of a small transmitter wheel, which is driven by a coupling over the running thread to be measured. A measurement of this type has the fundamental disadvantage that, in the case of fragile threads, tearing of the thread can occur during coupling or uncoupling from the transmitter wheel. Measurement accuracy etc. also depend on the type of yarn and to some extent on the tension of the yarn.

In this case, the measurement result has a significant deviation from the actual value at low thread tensions. Furthermore, in the case of yarn running speeds that change quickly over time, for example when a circular knitting machine is operated with a curling device, measurements are no longer possible. However, for many measurements, for example in the case of mechanical thread feeders, this type of measuring device is actually sufficiently accurate.

U.S. Pat. No. 3,858,416 discloses a yarn feeding device as follows. That is, it has a yarn supply roller driven by a small electric motor that is wound several times by the yarn and conveys the yarn without slipping, and the rotation speed of this motor is converted into a voltage or the current A pulse led to the motor. can be adjusted by controlling the characteristics of A yarn feeding device is shown. For this purpose, a tension control loop is provided, which control loop has a tension transmitter that detects the tension in the yarn running from the yarn supply roll, which transmits an electrical signal characterizing the actual value of the yarn tension. , and this signal is compared with an adjustable thread tension target value provided by an adjustable electrical target value voltage. Alternatively, this regulating circuit can also be configured in such a way that, instead of the electrical setpoint voltage, it is fed with the output voltage of a speed transmitter that touches the needle cylinder of the circular knitting machine; A switching arrangement can also be provided such that the output voltage is compared with a correspondingly converted output voltage of a rotational speed generator coupled to the electric motor. In this way, fixed synchronization of the rotational speed of the yarn supply disc with the mechanical rotational speed of the circular knitting machine is possible. A rotational speed generator coupled to the motor is configured as an incremental oscillator, which transmits a pulse train as an output signal, which pulse train is converted into an analog voltage by a frequency/voltage converter. . Therefore, by using the pulse output signal of the rotation speed generator.

The length or speed of the yarn being unwound from the yarn supply wheel can be measured. The use of a specific rotational speed generator coupled to the electric motor driving the thread supply roll is not only expensive (but is usually undesirable for the following reasons): This is because the inertial mass of the system is large, as a result of which the adjustment characteristics of the entire adjustment device are adversely affected, so that it may no longer be possible to adjust quickly to successive thread tension changes.

Problems to be Solved by the Invention An object of the present invention is to provide a yarn supply system for this type of electrically controlled yarn supply device without requiring additional costs and without reducing the functionality of the yarn supply device. It is an object of the present invention to provide a configuration that enables accurate continuous monitoring of.

Means for Solving the Problem This problem is solved by the invention in the device mentioned at the outset as follows. The monitoring core device for the yarn feed is therefore designed as a stepping motor with a step frequency or a step motor which is taken off from the step frequency. A first measurement for processing the frequency of the drive motor of the yarn supply roller and/or the output signal of a sensor that detects and scans a rotating element that is sliplessly coupled to the yarn or a signal derived from the output signal. a second measuring circuit for measuring the adjusted yarn tension target value, and a second measuring circuit for measuring the adjusted yarn tension target value;
The measuring circuit delivers a pulse frequency signal characterizing the number of step pulses and/or the incremental rotational movement of the rotating element, and the second measuring circuit determines the respective yarn tension target value. emitting a characterizing pulse repetition frequency signal and calibrated directly in units of yarn length and/or yarn running speed or yarn tension and supplied with signals of said first or second measuring circuit; Display means are provided.

In order to monitor the thread feeding, the signals that appear in any case, i.e. the output signals that occur in any case from the sensor, are processed in the electronic control circuit of the stepper motor of the thread feeding device, so that the new monitoring device can be integrated into the thread feeding device itself. Do not perform any operations on it. Via its display means, the yarn feeding device provides continuous and accurate monitoring of the yarn feeding without the use of a plurality of different specific devices. It can be the feed roller itself or it can be a signal transmitter element connected sliplessly to the running yarn.

In an advantageous embodiment of the invention, the first measuring circuit has at least one pulse frequency counter, into which the pulse frequency signal is guided, and which counter is subsequently provided with a control circuit for the display means. connected. For example, because the step frequency of a step motor that conveys the yarn through a yarn supply roller without slipping is directly proportional to the amount of yarn supplied per unit time, or because a rotating element is coupled with the yarn without slipping. , the frequency counter allows accurate measurement of the amount of yarn fed per unit time.

A significant simplification of the electronic circuit device is that the first measuring circuit
This is accomplished by having a frequency divider upstream of the pulse frequency counter.

The frequency divider is preferably an adjustable frequency divider, and a device for selective setting of the frequency division ratio is assigned to the frequency divider;
This makes it possible, for example, to easily provide the display means with different scale calibrations (for example 7 minutes in meters or 7 minutes in yards). In this case, in order to facilitate operation, the frequency divider is assigned a display device for the respectively set frequency division ratio.

Since the expense for a frequency divider with a non-integer division ratio is high, the device may be constructed as follows, i.e. the frequency divider is only set to an integer division ratio, and the display means is The displayed value may be configured to be an approximation within a predetermined measurement error range. By observing the errors, this measurement error range can be made narrower in such a way that the display precision of the measured values obtained by the respective integer division ratio is sufficient for the actual requirements.

The pulse frequency counter can furthermore have a device for providing an advantageously set gate time in advance. This also makes it possible, for example, to calibrate the scale of the display means later.

In order to check the correct functioning of the monitoring device, a selectively switchable test frequency source can be assigned to the second frequency counter.

In multi-system circular knitting machines, it has to be ensured that the same amount of yarn is processed in each partial circular knitting machine if smooth products are to be produced in normal operation. For example, what is required for settings is
The amount of yarn supplied per unit time set in one partial circular knitting machine can be directly compared with the amount of yarn supplied per unit time from the yarn feeding device of another partial circular knitting machine, which allows multiple Adjustment operation of each yarn supply device becomes possible. This type of comparison is now possible with the new monitoring device.

For this purpose, the first measuring circuit has switching means;
This switching means selectively applies the counting pulse frequency or the output frequency of the frequency divider to the pulse frequency counter. At the same time, the device has an input for a comparison pulse frequency source, which is generated, for example, by the other yarn feeding device of the circular knitting machine, and this input can be connected to switching means. Comparison means are connected to this input of the comparison pulse frequency source, and the display means are controlled from the output of the comparison means.

Therefore, it becomes possible to directly adjust the yarn supply conditions of other yarn supply devices of the same circular knitting machine on the display means of the yarn supply device. The comparison means preferably include a surface forming device. When the yarn feeding pulse frequency observed each time is equal to the ξ pulse frequency of the yarn feeding device with which it is compared, the frequency ratio is 1 and the display □ means displays the displayed value 1. O
Display o. If the ratio of both frequencies to be measured changes, the displayed value changes accordingly.

Simple comparative measurements of this type are of great importance when setting or adjusting knitting machines, for example circular knitting machines. At the same time, the operating status of the knitting machine can be monitored during operation. As is known, the yarn usage per rotation of the machine of a circular knitting machine changes significantly when the machine goes from a cold state to a warm state. In order to avoid having to constantly re-monitor all the already configured partial knitting machines during the temperature rise phase (for example, consider one yarn feeder as 1 master yarn feeder 1 and monitor all other yarn feeders) The feeding device is compared with this master yarn feeding device in terms of yarn feeding.

For example, in circular knitting machines, it may be necessary to determine the amount of yarn to be fed to an individual partial knitting machine for each revolution of the machine or for every given number of machine revolutions.

This yarn quantity can be measured simply and accurately with the new device of the invention, for which purpose the device is advantageously constructed as follows: a gate period in which the first measuring circuit cooperates with a pulse frequency counter. The pulse frequency counter is operated within this gate period, and the gate device is controlled by an external pulse.

Furthermore, the gate device is preferably connected to a photoelectric signal transmitter, which is controlled by markings on the mechanical part movable relative to it or on the needle cylinder. In practice, this is done in the following way: a marking, for example in the form of a light-reflecting marking, is glued to a moving part, for example to a needle cylinder of a circular knitting machine.

The gate device can also be selectively switched on by associated switching means, so that the knitting machine can be switched over depending on the particular measuring process. The gate device can also have signal means for indicating the respective operating state. This signal means indicates at least the beginning and end of the measurement, thereby significantly facilitating the operation of the gating device.

In order to make the target value transmitter for the yarn tension in the adjustment circuit of the yarn feeding device a direct current torque generator driven by a constant current, and further to enable its state to be detected by the displacement transmitter of the adjustment circuit. , this device can advantageously be constructed as follows. The second measuring circuit therefore has a signal processing circuit stage which derives a signal characterizing the thread tension from the drive current or from the input drive voltage of the torque generator.

Preferably in this case, the second measuring circuit comprises:
and a function generator which at least approximately forms a transfer function between the thread detection point and the input side of the torque generator or a constant current source feeding this generator.

The monitoring device for yarn feeding can be integrated into the yarn feeding device itself as follows. This means that the measuring circuit and the display means can be integrated in such a way that they are mounted directly in the casing part of the yarn feeding device. However, the following embodiments are also possible. That is to say, the monitoring device is constructed as its own portable or attachable unit, which part can be connected to the electrical circuit of the stepper motor or of the sensor (for at least one connection line or for the constant maintenance of the thread tension). It was designed to have fewer terminal devices for each connection line to the circuit.

This unit can also have switching means for the input of the comparison pulse frequency source and switching means for the gating device and possibly also for the signal input to the frequency divider. In this case, the switching means and the switching means are interlocked with each other, so that erroneous operation and thus erroneous measurements are eliminated.

A particularly simple and easy-to-handle configuration of the entire knitting machine is obtained in the following manner. This means that a photoelectric signal transmitter is integrated into the aforementioned unit in such a way that the sensor mentioned at the outset, which can advantageously include a light pen, can be connected to each signal input via a line connection. In this case, a light pen of this type is inserted into a corresponding cutout or holding location of the associated thread feeding device and there is an increment glued or attached, for example to the thread feeding roller or to a part that rotates with this roller. Scan the signal transmitter disk for detection.

Embodiment The yarn supply monitoring device whose details are shown in FIGS. 1 to 4 is used together with the yarn supply device whose basic structure is shown in FIGS. 5 and 6.

The yarn feeding device has a casing 1 which is equipped with a support 2 for fastening to a frame ring (not shown) of a circular knitting machine.

Furthermore, the region of the support is likewise not shown.

Electrical connections for electrical and electronic components housed in the housing 1 are provided. As can be seen in FIG. 6, an electric stepping motor 3 is provided in the upper part of the casing 1, which projects its shaft through a corresponding opening in the front wall of the casing.

Drives a spinning wheel placed on the shaft without rotational deviation. The spinning wheel also comprises a hub 5 mounted on the shaft and a number of substantially U-shaped wire bends 6 connected at their ends to the hub 5, each of the wire bends substantially parallel to the axis. It has a thread resting part 7 and an introduction slope part 8 following it.

The spinning wheel Φ, which constitutes the thread supply element and is designated as a thread supply roll, is assigned a thread guiding element which is fixedly arranged on the kennising 1. This thread guide element includes an introduction hole 10 provided in a support 9 fixedly attached to the casing, a thread direction changing hook 13 provided near the spinning wheel on the front wall of the casing, and a system outlet side of the spinning wheel cow. It consists of a predecessor 14.15 provided in the casing 13 of.

A thread 16 not shown, for example, a thread 16 coming from Jibin, is
The yarn passes through the introduction hole 10 and travels to the area of the introduction slope 8 of the wire bending section 6 via an adjustable thread mounting plate 17 provided on the support 9 and a direction changing hook 13. The introduction inclined portion presses the formed thread spool against the thread mounting portion 7 of the wire bending portion 6.

As a result, a storage reel consisting of a large number of thread windings is formed in the thread mounting portion 7. The storage reel is located in the thin thread loading area 7.
At the same time, virtually no binding 9 is ensured around the spinning wheel.

The thread 16 from the storage reel on the spinning wheel Φ passes through a first outlet thread hole 14 which is fixed in position and from there is pivotably mounted in the casing 14 on the side 19 opposite the predecessor 18. It passes through the end predecessor 18 of the thread guide arm 20, which constitutes a movable thread guide element, and from there returns to the fixed position of the twentieth thread hole 15. This second predecessor is provided near and substantially below the tenth thread hole 14, but offset. Second
From the predecessor 15, the yarn goes to the needles at the knitting point in the knitting machine (not shown) in the yarn consumption section 1.

On the outlet side of the spinning wheel Φ, a pivotably mounted thread guide arm 20 forms a substantially square-shaped elongated thread running path between the 70-year-old leader 18 and the stationary leader 14.15. There is. This thread running path is a thread reserve, the size of which depends on the angular position of the thread guide arm 20.

A small DC motor 22 is mounted and fixed in the front housing wall below the housing part 21, with its shaft projecting through a corresponding opening in the front housing wall.

It supports a substantially L-shaped operating lever 23 which is mounted so as not to be rotationally displaced. This operating lever is supported on one side opposite to the strand guide arm 20 at one end thereof. As a result, the actuating lever tends to be pivoted counterclockwise as viewed in FIG.

A permanent magnet-excited direct current motor 22, preferably constructed as a so-called bell rotor motor, serves as the torque generator. Alternatively, it may be replaced with a torque generator provided in a measuring section of a rotating coil measuring device or the like. The torque generator acts as an electromagnetic setpoint value generator for the thread tension, which setpoint value generator delivers a precisely defined, adjustable setpoint force via the operating arm 23 to the thread guide arm 20 and its hole 1.
8. This target value power is.

It is acted upon by a thread guided through the hole 18.

It acts in the opposite direction to the tensile force which depends on the thread tension. That is, in FIG. 1, the target value force acts to the left.

An electro-optical signal generator 24 is coupled to the shaft 19 of the thread guide arm 20, and the signal generator is connected to the shaft 19 of the thread guide arm 20.
Scan the 0 angular position and for this angular position. That is, it sends out an electrical signal representing the size of the yarn reserve mentioned above.

The signal generator 24 includes a light emitting diode 25 and a photodiode 26 in the light path of one light emitting diode 250. These two diodes are connected to a holder 27 fixed to the casing.
It fits in.

Shaft 19 of yarn guide arm 20 to optical path of photoelectric detection system
The diaphragm plate 28, which is placed so as not to be rotationally displaced, protrudes somewhat at its edge. The edges of the diaphragm plate follow a purpose-appropriate function, preferably an e-function.

Depending on the rotation of the thread guide arm 20, the phototransistor 2
An analog electrical signal is generated on the output side. This signal is provided by the periphery of the aperture plate 28 depending on the angular position of the thread guide arm 20. Occurs according to a predetermined fixed functional relationship.

The pivoting movement of the thread guide arm 20 is caused by two strokes in both directions.
It is restricted by the groove pin 29.30. If overlapping is not performed, the thread guide arm 2° is in the vicinity of the stopper pin 29 on the left (all). It moves towards the stopper pin 3o, but does not reach this stopper pin in normal operation.The thread guide arm 20 only comes into contact with the stopper pin 29 or 30 in the event of an obstruction.

The basic structure of the electric circuit for the step motor 3 that drives the spinning wheel cow and the DC motor used as the target value generator is shown in FIG.

sent out from the phototransistor 26 of the signal generator 24;
An analog signal representative of the angular position of the thread guide arm 20 is fed via a low pass filter 49 and a voltage follower 31 to a control circuit. The control circuit processes the signal and forms at the output a frequency signal with a predetermined pulse train frequency. This signal is shown at 33 and is fed to control electronics 34.

The control electronics 34 supplies the stepping motor 3 with an adjustment signal in the form of a corresponding step pulse train via a downstream power output stage 35 . Low pass filter 49 filters high frequency interference signals from the analog signal arriving from signal generator 24 . The voltage follower 31 delivers a signal voltage 2-tension to the output side with a relatively low output impedance. This signal voltage potential is
0 depending on the respective angular position. This voltage potential is applied to a circuit arrangement consisting essentially of two integrators 36, 37 of one circuit section. The circuit arrangement has a time constant that is adapted respectively to the starting and stopping characteristics of the stepping motor 3. As a result, when starting and stopping the step motor 3, the temporal change in frequency of the one-frequency signal 33 is limited as follows.

That is, the step motor 3, which is loaded by the thread 16, the spinning wheel 4, etc., is limited so that it can follow the frequency change.

During the start-up time of the stepping motor 3, the yarn consumer can supplement its yarn demand from the yarn reserve. In this case, the thread tension is always kept at its desired value by means of a desired value torque that is dependent on the adjustment angle of the DC motor. At the same time, the step motor 3 rotates the spinning wheel cow at a rotation speed corresponding to the required thread speed.

Accelerate within a given time. The length of that time is determined by the starting characteristics, and the step motor 3 receives the frequency signal 3.
3 ensures that the steps are kept.

The integrator 36 limits the rate of frequency change when the step motor 3 is started. On the other hand, the integrator 37 limits the frequency change rate to a value below the stop characteristic of the step motor 3.

As a result, the step motor 3 accurately follows the frequency change of the frequency signal 33 until it reaches a stopped state.

A device diode section 39 consisting of an integrator 36, 37 is connected downstream, the output of which is connected via a low-pass filter 39 to a voltage/frequency converter 4.
Connected to 0. This voltage/frequency converter delivers a frequency signal. Diode section 38 forms a threshold circuit and prevents signal voltages below a lower threshold from being applied to voltage/frequency converter 40 . If a signal voltage below the threshold is supplied, an unacceptably low frequency will be temporarily transmitted to the step motor 3. The low noise filter 39 prevents disturbances in the voltage/frequency converter 40. The converter is configured to suppress zeros on the output side and has variable characteristics in its transconductance. Thereby, the angular position of the thread guide arm 20.

The magnitude of the thread reserve for a given fixed thread running speed can thus be adjusted accordingly.

The analog voltage signal sent out from the voltage follower 31 is further supplied via a potentiometer 41 to a differentiation element 42 where differentiation is performed. The output side of the differential element 42 is the addition stage 4
3 and a second potentiometer 4 via a voltage follower 44
5 is connected. This potentiometer adjusts the magnitude of the torque of the DC motor 22 and the target value of the thread tension.

A regulating input of a constant current source 46 is connected to the potentiometer 45, which excites the DC motor with a constant current via a power output stage 47.

The operation of this electronic control system supply device is as follows.

For example, when yarn consumption decreases and a control deviation occurs, the yarn guide arm 20 deviates from its target angular position and the first circuit section 32
The analog signal supplied to the circuit undergoes a corresponding change. As a result, the corresponding pulse adjustment signal 33 of the stepping motor 3 formed in the circuit 32 also changes accordingly. Thereby, the step motor 3 changes its rotational speed, ie, the yarn feeding speed, until a steady state can be reached again.

In this steady state, the thread guide arm 20 assumes a fixed angular position. In this angular position, the thread tension is in equilibrium with the setpoint force exerted by the operating arm 23. This target value power is.

Since it is constant regardless of the angular state of the operating arm 23 and the thread guide lever 20, the thread tension is constant at each thread supply speed, that is, as long as the thread consumption per time unit is within the control range. be. Control acts in an integrated manner.

Via the separating element 48 and the summing stage 43, an external control signal can also be supplied from an external signal source to the control input of the constant current source via the potentiometer 45. This signal source is, for example, for the entire yarn feeding system of a single-turn knitting machine. or a central control unit for a predetermined number of yarn feeding devices. The torque of the DC motor 22 and thus the thread tension can be remotely controlled by the adjustment signal.

It is sent out from the already mentioned yarn supply device. An electronic monitoring device is provided in order to be able to continuously monitor the amount of yarn per unit time, i.e. the speed of yarn travel to the knitting location, the adjusted yarn tension and, if necessary, the yarn length delivered within a given time. It is provided. Details of the electronic monitoring device are shown in Figures 1 to 4.
In the figure, the portable or mounting type is constructed as a mold-specific unit. This component unit is housed in a casing 50 shown in the front and rear views of FIGS. 1 and 2. Back side of casing (Figure 2)
is provided with a connection device in the form of two measuring jacks 51,52. The connecting device forms the signal input side and connects via pluggable connecting lines two corresponding measuring jacks 53.5 of the electronic regulating circuit of the yarn feeding device shown in FIG.
4 is connected. The measuring jack 53 is connected to the input side of the stepping motor 3 and thus delivers a pulse signal representative of the stepping frequency of the stepping motor 3. This pulse signal is fed to one measuring jack 51 of the monitoring circuit, the other measuring jack 54 being connected via a constant current source 46 and a power output stage 47 to the input side of the DC motor 22 . A signal representing the constant excitation and DC current that adjusts each DC motor is sent to the measuring jack 52 of the monitoring circuit.
is supplied to Other possibilities include measuring jack 53
can also be provided directly on the output side of the one circuit section 32. Thereby, the measuring jack likewise transmits a pulse signal 33 representing the step frequency of the stepping motor 3.

A first measuring circuit (FIG. 3) and a second measuring circuit 56 (FIG. 4) are provided in the housing 5o on corresponding substrates. Their input sides are connected to first and second measuring jacks 51 and 52. Of these, the first measuring circuit 55 is used to monitor the amount of yarn supplied or the yarn running speed, and the second measuring circuit 56 is used to monitor the yarn tension.

The first measurement circuit 55 has a pulse frequency counter 57,
Its input 58 can be selectively connected directly via a switch 59.
It can be connected to the measurement jack 51 or the frequency divider 60. Frequency divider 60 is connected to measurement jack 51. Frequency divider 60 is an adjustable frequency divider, but is only adjustable to integer division ratios. A coding switch 61 is used for this adjustment. Each coding switch 61 has a digital display 62 for the adjusted division ratio. The illustrated position "a" of the changeover switch 59
”, the 1 frequency divider 60 is connected between the measurement jack 51 and the pulse frequency counter 57. In the other position “b” of the changeover switch 59, the pulse frequency counter 57
The input side 58 of is connected directly to the measuring jack 51. On the other hand, the second input 63 of the Nosols frequency counter is connected to a further measuring jack 64 . This measurement jack 64 is used for connection to a comparison pulse frequency source. The comparison pulse frequency source is constituted, for example, by a further yarn feeding device of the winding knitting machine, and the measuring jacks 53 and 64 of the winding knitting machine are connected via a corresponding connecting cable. As a result, the measuring jack 64 can receive the step frequency pulse signal of the step motor 3 of this further thread feeding device.

On the output side, the pulse frequency counter 57 is connected to the control electronics 65.
It is connected to a digital LCD or LED display device 66 via. This display device can be read from the front of the casing as shown in FIG.

A test frequency source is integrated into the pulse frequency counter 57. This test frequency source is switched on by a changeover switch 67 in the switch position shown in FIG. As a result, the display device 66 displays several 10,000,000 (1
A corresponding value is displayed at 0MHz. In another position of the switch 67 the test frequency source is switched off, and the Cruz frequency counter 57 processes the step frequency signal supplied to it via its input 58.63.

The power supply for the measuring circuits 55, 56 is from a direct current source shown at 68, via a device switch 6 which can be operated from the outside of the casing.
9 (FIG. 2). In this case, the connection state is monitored by the control lamp 70.

The first measuring circuit 55 operates as follows: the thread quantity 6 is fed by the stepping motor 3 via the spinning wheel Φ substantially without slip. That is, the amount of yarn actually supplied per unit time is directly proportional to the number of steps per second of the step motor, that is, the step frequency of the step motor.

Assuming that a yarn length of 0.2 yrL is supplied per rotation of the spinning wheel Φ (it has been empirically known that this varies only slightly depending on the yarn tension and type of yarn), the step motor 3 is The step angle for each step is 18°.For example, at a step frequency of 5,0OOflz, the actual amount supplied per unit time is.

From there, the amount supplied per υ unit time is detected by simple but accurate step frequency counting.

At the same time during a predetermined length of operating time (e.g. Ringer (Ri)
ngel) by pulse counting in the process of processing.

The amount of thread consumed is directly detected.

The step frequency of the step motor 3 can be directly displayed on the display device 66. But this only makes sense for special purposes. In practice, display device 66 is calibrated as follows. That is, the display device displays the amount of yarn supplied per unit time, that is, the yarn supply speed in meters per minute.

A 1 frequency divider 60 and an associated calibration switch 61 are provided to enable this direct display of the supply system quantity per unit time in customary units (for example rrLZ minutes or yards/minute). The device 60 is adjusted to an integer division ratio by means of a calibration switch 61.The division ratio is within a predetermined measurement error range, revealing an approximate value that is close to the actual displayed value.

In the above-mentioned example in which the yarn supply rate is 300 m/min, the step frequency is 5,000 Hz, and in order to adjust the accurate display value of the 1 frequency divider 60, it must be adjusted to 300 16.666. This is because dividing by a number other than an integer will result in a very high electronic circuit cost.Actually, the frequency divider 60 is adjusted to a division ratio of 17 by the coding switch 61.In other words, measurement errors may occur from this. It can't be helped. Instead of a yarn supply rate of 300 m/min, in the above embodiment, the yarn supply rate is only 150 η.
294.11 m/min is displayed. The resulting measurement error therefrom is in the range of 296.

However, in addition, the diameter of the spinning wheel Φ can be selected such that, for a selected integer division ratio, the measurement error is zero or an arbitrarily small amount that can be ignored. (In the example described above: for example, the spinning wheel supplies 0.1962 m of thread in one revolution.) When switching the displayed value to another measurement unit.

Simply adjust the coding switch 61 accordingly. The adjustment can then be monitored via the display device 62.

Depending on the type of adjustment and reading, the following values can be read on the display device 66 after a measuring time of approximately 1 second: a) "Test" position of the changeover switch 67: 10.0
00 (equivalent to IOMH2K) b) "Operating" position of selector switch 67 and selector switch 590'''b'' position Step frequency of step motor 3 Hz C) "Operating" position of selector switch 67 and "a" of selector switch 59 Yarn supply amount per position 2 hour unit m/
There is a changeover switch 59 in position "b".

If the input side of the stepping motor 3 of a further yarn feeding device is connected via the measuring jack 64.

The two step frequencies which are fed via the input 58.63 to the pulse frequency counter 57 are
They are compared with each other by surface formation in 7. If the two frequency values are the same, the value 1.00 is displayed on the 1 display device 66. 1 when the ratio of the two measured frequencies changes with respect to each other
The displayed value also changes accordingly.

This ratio measurement is particularly important when adjusting multi-system circular knitting machines. Electronic thread supply device and first measuring device 5
5, a simple ratio measurement is carried out between the first adjusted and corrected yarn take-off point (knitting device) and the yarn take-off point (knitting device) that is to be further adjusted or monitored.Time monitoring is also possible. be.

A second measuring circuit 56 shown in FIG. 4 provides an indication for the thread tension of the simultaneously running threads.

The value is displayed on the LCD display device 71 (FIGS. 1 and 4). Analog devices can also be used in those positions. The display device 71 can directly measure the thread tension in units, for example durams or mN.

The yarn tension measurement assumes that the direct current that excites the DC motor is proportional to the torque exerted on the operating arm 23, so that a measure for the adjusted yarn tension target value is displayed. However, this drive current cannot be easily measured. This current has a relatively small value, since otherwise a constant current source 46 supplies a clock current via the power output stage 47 with a clock frequency of approximately 25°. For this reason, the second measuring circuit 56 is supplied via measuring jacks 54, 52 with the input voltage of a constant current source 46, which acts as a voltage/current converter. This input voltage is proportional to the constant current delivered. This voltage is applied to the inverting input of IC 72 of the phase inverting stage. The output side of the phase inversion stage is connected to IC 75 via resistor 74 and transistor T1.

This IC is part of the function generation stage 73, and its output side 7
7 controls a display device 71 via corresponding control electronics. For example, display devices.

It can be calibrated between 10g and 10g.

Therefore, function generator 76 is necessary.

This is because a linear relationship is established between the control voltage of the constant current source 46 and the excitation current of the DC motor 22. However, the functional dependence between this control voltage and the thread tension on the forerunner 18 provided at the end of the thread guide arm 20, ie the thread tension, is non-linear. This is because the frictional force between the thread and the hole 18 of the thread guide arm 20 depends on the thread tension.
This is also because additional nonlinearity may be introduced into the transfer function of the DC motor 22. Function generator 76 has the following transmission characteristics. That is, it has a transmission characteristic that substantially corresponds to a cross section of a trigonometric function. This trigonometric function can be approximately reproduced by the e function.

The potentiometers 79,80 control the function generator 76 and the display device 71 to introduce a correction function, which may occur, for example, when using yarns with very different friction values or when the yarn travels. Deviations of the respective adjusted basic values caused by changes in the road, etc. are compensated for.

The current supply for the second measuring circuit 56 is from a current source 68 (FIG. 3).
It will be held on the 78th.

In addition, the pulse frequency counter 57 of the first measurement circuit 55
It also has an adjustable gate time. This gate time is used for post-calibration of the display device 66 or for measuring the length of yarn fed within a predetermined period of time.

FIGS. 7 and 8 show a variant embodiment of the device according to the invention, which is characterized by additional functions and usage capabilities.

According to this embodiment, it is possible to not only measure and display the amount of yarn fed per unit time or the stepping frequency of the step motor 3 of the yarn feeding device, but also to It is also possible to carry out a measurement of the amount of thread fed into the yarn, in which case also the comparative measurements already described with reference to the first exemplary embodiment in FIGS. 1 to 6 are still possible.

The device casing 5o is only shown in plan view in FIG. The casing, in its elongated, rectangular shape, is designed in such a way that it can be held comfortably in the hand, so that measurements can be carried out directly on the machine in a simple manner with this handset. Electrically interlocked keys 8182.8
By pressing 3, the handset can be set to the respective measuring function: key 82 allows the handset to measure the amount of thread per unit time, for example m/jl! I or 1
nCh/Sec, depending on the connection of the handset, the measurement can be carried out at the stepping frequency of the stepper motor driving the thread feeding roller of the respective thread feeding device or at the thread and slipless speed. This can be done indirectly via the output of a sensor which detects the coupled rotary element or directly via a signal transmitter with a transmitter wheel which is connected sliplessly to the running thread.

When the key 81 is pressed, the front plate can measure the amount of yarn fed within a defined time interval, for example within one revolution of the machine.

Finally, by pressing the key 83, the handset switches to the yarn quantity comparison measurement, which makes it possible, for example, to directly compare the yarn quantities supplied to two knitting systems of a circular knitting machine with one another.

The measurement can then take place indirectly or directly, as explained in connection with key 81, also when actuating keys 82, 83.

In order to selectively implement such various measurements, the first measurement circuit 55 is basically constructed as shown in FIG. The second measuring circuit for measuring the thread tension is similar to the previously described embodiments and is therefore not shown again in FIG. 8. The pulse frequency counter is again indicated at 57. It controls, via control electronics 65, a digital LCD or LED display 66 that is readable from the front of casing 50. A frequency divider 60 connected upstream of the pulse frequency counter 57
This has already been explained in the purpose statement. The same applies to the calibration switch 61 and the display section 62 belonging to this frequency divider and the changeover switch 67 for the integrated test frequency source of the pulse frequency counter 57.

A first input 58 of the pulse frequency counter 57 is connected to the output of the OR element 84 and to the input 63 of the force cylinder 2.
A measuring jack 64 is connected here as well, which is used to connect a pulse frequency source for direct comparison. OR
The two input sides of element 84 are two AND elements 85 and 86.
The input side of the AND element 85 is connected to the frequency divider 60 and the key 82 which can apply a positive potential of, for example, 5■ to the second input side of the AND element 85 when operated. and is connected to. The input side of the frequency divider 60 is connected to the measurement jack 51 and the input side of the second AND element 86 . Connected to the second input side of the AND element 86 is a key 81 that can apply a positive potential of, for example, 5V to the input side when operated. A third input of the AND element 86 is connected to a third key 83 via a diode 87, so that when this key 83 is operated, a positive potential of, for example, 5 V is applied to this third input. be able to.

A diode 88 connected in parallel to the diode 87 is provided between the two keys 83 and 81 and polarized in the same direction. Furthermore, on the second and third input sides of the AND element 86, upon actuation of the key 81, the pulse frequency counter 57 is activated only during the gating time interval predetermined by the gating circuit as follows. Gate circuit is connected. That is, the pulse signal supplied to the first measuring circuit is counted only during the gating time interval which is limited by the external gating pulse.

This gate circuit consists of two bistable D multivibrators 8
It has 9,90. The two inputs of these multivibrators are labeled C and D, the two outputs are labeled Q and Q, while the reset input is labeled R.

The set input side S is connected to ground. The two multivibrators 89 and 90 have the following connection configuration. That is, the Q output side of the multivibrator 89 is connected to the clock input side C of the second multivibrator and to the D input side of the first multivibrator 89, while a light emitting diode is connected to the Q output side of each of the two multivibrators. 91 and 92 are connected. These light emitting diodes are configured to be visible from the front of the handset casing 50 (FIG. 7) in common with a third light emitting diode connected to the Q output side of the multivibrator 90. The other side of each of the three light emitting diodes 91 to 93 is grounded via a resistor 94.

The output side of an AND element 95 is connected to the CK input side of the first multivibrator 89, and the first input side of this AND element is connected to the D input side and the Q input side of the second multivibrator 90 (light emitting diode 93 and). Connected to the output side.

A photoelectric sensor in the form of a reflective light barrier 97 is connected to the first input of the AND element 95 via an automatic signal level correction and trigger signal generation stage 96 .

The reflective light barrier 97 includes an IR transmitter diode and a photoreceiver diode, which are spatially spaced approximately 1
A signal-forming stage 96 is downstream connected to the output side of the reflective light barrier 97 with simple light reflectors 98 (mirrors, metal surfaces, bright adhesive tapes, etc.) placed at a spacing of 0 to 40 ffiI11. are mutually arranged in such a way that a signal level change sufficient to trigger is achieved.The associated automatic level correction stage serves to automatically adapt to the light conditions at the measuring point, so that the signal level is relatively strong. The required jump or delta sensitivity is maintained even in the presence of (constant) external light. Automatic level correction and trigger signal formation stage 96
includes a differential element, via which the respective trigger pulse reaches the first input of the AND element 95.

In addition, at least the transmitting diode and the receiving diode of the reflective ride barrier 97 are arranged behind the transparent cover on the end face of the handset casing 50, as is clear from FIG. A trigger signal can be generated by correspondingly approaching a reflector 98 mounted on the needle cylinder - two multivibrators 89, two reset inputs R of 9o in parallel with resistor 100, 101 and resistor 100. capacitor 9
It is connected to the key 81 via an ohmic voltage divider with 9.

The circuit described above operates as follows: Let us measure the amount of yarn fed in the knitting mechanism per rotation of the needle cylinder of the circular knitting machine. It is assumed that the circular knitting machine is equipped with an electronic yarn supply device as shown in FIGS. 5 and 6. The measuring jack 51 is connected via a corresponding connecting line to the measuring jack 53 of the electronic regulating device of the yarn feeding device according to FIG. A representative pulse signal is supplied. Symbol v′+m/U”
The key 81 marked with "1 inch/rev" is pressed. A light-reflecting strip with markings is glued to the drum of the circular knitting machine. The handset casing 50 absorbs this light forming a reflector 98 It is held at a distance of lo+m to 40+m+ from the reflecting tape.

When the key 81 was pressed, the key contact 102 was operated at the same time. Via this contact, the current supply of all integrated circuit arrangements of the handset was switched on via a switching electronic circuit, which is not shown in detail. At the same time, from the output side of the key 81, 2
Reset input side R of one multivibrator 89.90
is controlled for a short time, where two multivibrators 8
9.90 has been reset.

In this reset state, the Q outputs of the two multivibrators 89, 90 have the level もL〃, while the Q outputs have the u Htt level. This controls the light-emitting diode 93 with the symbol N set, while the light-emitting diodes 91, 92 with the symbol 9 count or "block" are not activated.
The second input of element 95 is coupled to the tt Htt level.

AND element 85 is blocked. This is because the second input side is 1L" due to the key 82 not being operated.
This is because it is on the level. A first input of a further AND element 86 is supplied with the positive stepping pulse of the stepping motor 3 via the measuring jack 51, while a second input of the AND element 86
The input side of is held at the %Hn level by the operated key 81. Due to the diode 88, the third input of the MO element 86 is initially at the ``L'' level.The AND element 86 is therefore blocked, so that the progressive pulse arriving via the measuring jack 51 is detected by the pulse frequency counter. 57 is not reached and is not counted there.The pulse frequency counter 57 is therefore not active.

When a corresponding mark on the reflector 98 then passes through the reflective light barrier 97, the light barrier sends out a corresponding pulse which results in an output of the automatic level correction and trigger signal generator. A positive trigger signal edge occurs.

This causes the hitherto blocked AND element 95 to be connected through, so that this positive trigger signal edge reaches the clock input CK of the first multivibrator 89 and brings this multivibrator into its other state. In other words, its Q output side becomes "H" level and its Q output side becomes "L".Therefore, the second light emitting diode 915 is also energized.

At the same time, however, the third input of the AND element 86 also goes to the "H" level, so that the second input of the OR element 84 of the step or generally counting pulse supplied via the measuring jack 51
The OR element transfers these counting pulses to the first input 58 of the pulse frequency counter 57.

This causes the Sibars frequency counter 57 to start operating. After that, the counter counts the counting pulses supplied to it.

The next trigger pulse, triggered by a subsequent reflection of the reflective light barrier 97 against the corresponding mark on the reflector plate 98, causes the Q output of the first multivibrator 89 to redirect to u.
Set L to tt level, while its Q output side is set to w
Becomes Hn level.

As a result, the second multivibrator 90 switches,
Its Q output side becomes xH" level, while its Q output side becomes "L" level. As a result, the third light-emitting diode 92 with the symbol "block" is energized, while the two light-emitting diodes 91, 93 that were previously emitting light are energized.
(“count” and 1\set”) is quenched.

Furthermore, the AND element 95 is a second multivibrator 90
Due to the %L/7 level on the Q output side of the trigger pulse is blocked. Since the Q output side of the first multivibrator 89 also shifts to L level, the AND element 8
6 is also blocked, so that the next step or counting pulse from the measuring jack 51 cannot reach the pulse frequency counter 57.

The pulse counting process is thus terminated and the display device 66 shows directly the amount of yarn fed between two consecutive trigger pulses, for example during a rotation of the machine, /U to 1 nch/r.
Display in ev.

If the described counting process is to be repeated, key 81 must be pressed anew.

This measuring process is obviously particularly simple and easy to operate. After the circular knitting machine has been turned on and the handset casing 50 has been placed at a spacing of 10 to 10 mm with respect to the light-reflective measuring mark on the needle cylinder, it is only necessary to press the key 81, which causes the light-emitting diode to 931 set is illuminated to indicate that the handset is ready for measurement. When the mark passes the measuring handset, the second light emitting diode 91 emits light, indicating the start of the measurement.

After exactly one rotation of the machine or during the second passing of the measuring mark, the third light-emitting diode 922 is illuminated, while the two other light-emitting diodes are extinguished, and this marks the end of the measuring process. is displayed.

When it is desired to carry out a measurement of the thread feed rate with the measuring handset, for example at fH/81711, the key 82 is pressed. As a result, the second input side of the p-AND element 85 shifts to the 'aHp level.

The stepping pulses of the stepping motor 3, which are supplied via the measuring jack 51, are fed to the input of the frequency divider 60. The positive output pulses of the frequency divider reach the pulse frequency counter 57 via the AN) element 85 and the conducting OR element 84 and can be counted there. The pulse frequency counter 57 has a crystal controlled oscillator indicated at 103, as in the first embodiment described above. This oscillator is integrated with a frequency division stage in order to precisely set the selectable gate time in each case before the pulse frequency counter 57. This gate time is set to 1 sec in this case. As already explained, the display device 66 may be, for example? ? ! /m
Directly displays yarn running speed.

AND element 86 is blocked in this type of measurement.

This is because the second and third input sides are continuously
This is because it is maintained at the same level.

When the measuring handset is to be used, for example, for comparative measurements between yarn feed rates in two knitting systems of a circular knitting machine, key 83 is pressed. The stepping or counting pulses of the two thread feeding devices to be compared with each other are fed via two measuring jacks 51.64, of which the second measuring jack 64 directly feeds the second measuring pulse of the pulse frequency counter 57.
is connected directly to the counting input side 63 of. AND element 8
5 is blocked. This is because the second input side is at the NL level due to the keys 82 not being operated. The positive counting pulses supplied via the measuring jack 51 reach the first counting input 58 of the pulse frequency counter 57 via a conducting AND element 86 and a through-connected OR element 84 .

AND element 86 has its second and third inputs connected to % via diode 88,87 and key 83.
Since it has a Hu level, it is conductive. The frequency comparison between the two pulse frequency signals supplied via the measuring jacks 51, 64 is carried out by quotient formation in the pulse frequency counter 57 as previously described in accordance with the first embodiment.

- The pulse frequency counter 57 is configured to be switchable for event counting, frequency measurement and frequency comparison measurement, as shown on the side. The mode of operation each time is automatically controlled through the electronic changeover switch 104 by operating one of the keys 81, 82, 83,
For this purpose, the input 105' event count of this switch is connected to the output of the key 81, and its input 106
% frequency measurement is connected to the output side of key 82 and finally its input side 107N frequency ratio measurement is connected to key 83
connected to the output side of the

In addition, the measuring handset has its own sensor whose first measuring circuit described above detects and scans the running thread directly or indirectly, and which also processes the pulse repetition frequency signal coming from the measured value generator. As long as it is possible, it can be used universally.

An example of a measurement value generator of this kind for direct measurement of a running thread is illustrated in FIG. Therefore, it is connected to this wheel in a slipless manner. The generator wheel is fixedly connected to a measuring disk 111, which is configured, for example, in the form of a sector disk whose light and dark surfaces are scanned for detection by a fork-shaped light barrier 112. The output signal delivered by the fork-shaped light barrier 112 is fed to a signal processing stage 113 which transfers the processed signal to a pulse forming and frequency doubling stage 114 and from there to an incremental output signal of the measuring disk 112. The counting pulses characterizing the rotational movement are transferred to the measuring jack 51 or 64 of the first measuring circuit of FIG. 8, for example.

The generator wheel 110 can also be another element which is connected sliplessly to the yarn 16 and is rotatably mounted on the yarn track, for example a yarn feed roller of a mechanical yarn feed device. In this case, a measuring disk 111, which is configured in the form of a self-adhesive sheet, is applied to the thread supply roller or to the rotating element which is fixedly connected thereto and thus controls the rotational movement and thus the incremental running speed of the thread. It is conceivable to perform measurements. Instead of the fork-shaped light barrier 112, it consists in principle of a reflective light barrier similar to the reflective light barrier 97 and is connected to the first measuring circuit via a downstream signal processing and pulse-forming stage. It is also possible to use a so-called photoelectric recording pen or light pen 115, which sends out a suitable input frequency signal. If this type of photoelectric recording pen is used, a suitable accommodation hole for the photoelectric recording pen to be attached should be formed, for example, in the holder or the casing of the thread supply device. It is also possible to optically scan the measuring disk 11, which has markings placed at --like angular spacings, in which case the recording ben is optically scanned.

Furthermore, the reflective light barrier 97 of the first measuring circuit can also be constructed separately or removably from the housing 5o, with the connector connection indicated at 116 in FIG. A suitable connecting cable is provided.

[Brief explanation of the drawing]

Figure 1 is configured as a vortuple unit.
2 is a side view of a simple embodiment of the device of the invention with display means shown; FIG. 2 is a back view of the device of FIG. 1; and FIG. 3 is a side view of the device of FIG. FIG. 4 is a block diagram of the first measuring circuit, FIG. 4 is a block diagram of the second measuring circuit of the device of FIG. 1, and FIG. 5 is a block diagram of the second measuring circuit of the device of FIG. 1), FIG. 6 is a block diagram of the electrical adjustment circuit of the yarn feeding device of FIG. 5, and FIG. 7 is a perspective view of the yarn feeding device of FIG. 8 is a side view of a second embodiment of the device of the present invention showing on/off, switching and indicating means; FIG. 8 is a block diagram of the first measuring circuit of FIG. 7; FIG. 9 is a schematic illustration, partially in perspective, of a signal transmitter configured to be connected to the device of FIG. 7 for directly measuring yarn running speed. 3...Step motor, Cow...Thread supply roller, 22
...Target value transmitter, 55...First measurement circuit, 56
... Second measurement circuit, 57 ... Pulse frequency counter, 60 ... Frequency divider, 61 ... Frequency division ratio selection setting device,
62.66.71...Display device, 81,82,83.
...Function key, 111... Rotating element, 112.
...Sensor FIG, 2 FIG, 5 FIG, 7

Claims (1)

[Claims] 1. A device for monitoring yarn feeding in a yarn feeding device for a textile machine, the device comprising: a stepper motor (3) configured as a stepping frequency or a stepper motor (3) derived from the stepping frequency; The frequency of the drive motor of the feed roller (4) and/or the rotationally moving element (
111) for non-contact detection and scanning of the output signal of the sensor (112) or a signal derived from the output signal, the first measurement circuit (55) and/or target value transmission of the adjustment circuit attached to the yarn supply device. a second measuring circuit (56) for measuring the adjusted yarn tension target value of the device (22);
and the first measuring circuit (55) sends out a pulse frequency signal characterizing the number of step pulses and/or the pulse frequency signal characterizing the incremental rotational movement of the rotating element, and the second measuring circuit (55) 5
6) emit a pulse frequency signal characterizing the respective yarn tension target value and is calibrated directly in units of yarn length and/or yarn running speed or yarn tension and A yarn supply monitoring device characterized in that it is provided with display means (66, 71) receiving signals from a measuring circuit (55, 56). 2. The yarn supply monitoring device according to claim 1, wherein the rotating element is a yarn supply roller (4). 3. The rotating element is a signal transmitter element (110, 1) which is sliplessly coupled to the running thread.
11) The yarn supply monitoring device according to claim 1. 4. The first measuring circuit (55) has at least one pulse frequency counter (57), which is supplied with a pulse frequency signal and has a control circuit (65) for the display means (66). 4. A yarn feed monitoring device according to claim 1, which is connected downstream. 5. The first measurement circuit (55) is a pulse frequency counter (57).
5. The device for monitoring the thread supply according to claim 4, further comprising a frequency divider (60) connected upstream of the thread supply. 6. Device for monitoring yarn feed according to claim 5, characterized in that the frequency divider is an adjustable frequency divider (60) to which a device (61) for selectively setting and adjusting the frequency division ratio is assigned. 7. A device for monitoring yarn supply according to claim 5, characterized in that the frequency divider (60) is associated with a display device (62) for the respectively adjusted frequency division ratio. 8. The frequency divider (60) can be set and adjusted only to integer frequency division ratios, and the displayed value of the display means (66) is an approximate value within a predetermined measurement error range, or 7
Yarn feed monitoring device as described. 9. Yarn feed monitoring device according to claim 4, wherein the pulse frequency counter (57) advantageously has a device for presetting an adjustable gate time. . 10. Claim 4, wherein a test frequency source that can be selectively connected to the pulse frequency counter (57) is assigned.
9. The yarn supply monitoring device according to any one of 9 to 9. 11. The first measurement circuit (55) has switching means (59, 82,
83, 104), the counting pulse frequency or the output frequency of the frequency divider (60) can be selectively applied to the pulse frequency counter (57) by the switching means, and the first measuring circuit The input side for the comparison pulse frequency source (
64) and the input side (64) of said comparison pulse frequency source has a comparison means (64) of a pulse frequency counter (57).
11. A device for monitoring yarn feed according to claim 5, characterized in that the display means (66) are controllable from the output side of the pulse frequency counter. 12. Yarn feed monitoring device according to claim 11, wherein the comparison means comprises a device for quotient formation. 13. First measurement circuit (
55) has a gating device cooperating with a pulse frequency counter (57), said gating device predetermining the gating time interval in which said pulse frequency counter operates, and said gating device 13. The yarn supply monitoring device according to claim 4, wherein the yarn supply monitoring device is configured to be controllable by. 14. The gate device is connected to the signal output side of a photoelectric signal transmitter (97), said signal transmitter being controlled by a marking (98) on an element that moves relative to said signal transmitter. 14. The yarn feed monitoring device according to claim 13, wherein the yarn feeding monitoring device is capable of: 15. Device for monitoring yarn feed according to claim 13, characterized in that the marking (98) is glued to the moving element, for example the needle cylinder of a circular knitting machine. 16. Claim 14 or 1, wherein the gate device is selectively switchable by means of the associated switching means (61).
5. The yarn supply monitoring device according to 5. 17. Yarn feed monitoring device according to claim 14, wherein the gate device has signal means (91, 92, 93) for indicating the respective operating state. 18. The target value transmitter is a DC torque generator (22) driven by a constant current, and the position of the DC torque generator can be detected and scanned by a displacement transmitter (24) of the regulating circuit. , and the second measuring circuit (56) has a signal processing circuit stage (73, 76) for extracting a signal characterizing the yarn tension from the excitation current or the voltage corresponding to the excitation current. The yarn supply monitoring device according to any one of the items. 19. The signal processing circuit stage includes a torque generator (22) and a detection scanning point (18) of the thread (16) and a constant current source (46) feeding the input side of the torque generator (22) or the torque generator. 19. The yarn feed monitoring device according to claim 18, further comprising a function generator (76) which at least approximately simulates the transfer function of the transmission line located between the yarn supply line and the line. 20. The device is constructed in the form of its own portable or integrally assembled unit, which unit has an electric circuit for the stepper motor (3) or the sensor (112) or the adjustment for constant maintenance of the thread tension. 20. Claims 1 to 19, characterized in that it comprises at least one terminal arrangement (51, 52, 64) for at least one connecting line leading to the circuit.
The yarn supply monitoring device according to any one of the preceding items. 21, the unit is connected to the input side of the comparison pulse frequency source (64
), switching means (81) for the gate device and optionally switching means (82) for the signal input connected to the frequency divider; Claims 5 and 11, wherein the switching or switching means are mutually locked.
, 16 or 20. 22. Yarn supply monitoring device according to claim 14 or 21, wherein the photoelectric signal transmitter (97) is integrated within the unit. 23. Yarn feed monitoring device according to claim 1, wherein the sensor comprises a light pen (115).