CS590388A2 - Thread supply checking device with thread feed device for textile machines - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for controlling the yarn supply of a yarn feeding device for textile machines, in particular a yarn feed drum driven without a sliding thread. For example, in multi-system circular knitting machines, to achieve a greater uniformity of the goods in the case of the welding of the needles, on the individual knitting systems, the quantity of threads to be supplied, i.e. the quantity of yarn to be checked, is checked. to control thread speed to ensure that the same amount of thread is processed on all knitting systems. To this end, a wide variety of yarn measuring devices are used, which typically operate with a sensor or a sensor in the form of a small sensor wheel, which is driven by the friction measured by the yarn. This measurement of the yarns brings with it a fundamental disadvantage, in particular in the case of sensitive yarns, there is a risk of breakage when connecting or disconnecting the sensing wheel

The accuracy of the measurement is also dependent on, among other things, the type of yarn and the thread tension, and the measurement results are very different from the actual values at low thread tension values. Finally, with frequent changes in the speed of movement of the yarns, for example, when the circular knitting machine operates with an annular apparatus, measurement is hardly possible. However, for many measurements, particularly for mechanical thread feeding devices, such measuring devices are sufficiently accurate in practice. U.S. Pat. No. 3,858,416 discloses a yarn feeding device which is provided with a yarn feed drum several times wound by a yarn which is so slip-free that it is driven by a small electric motor whose speed is adjustable the change in voltage or the characteristic of the current pulses supplied by the electric motor. For this purpose, a control circuit is provided, which is provided with a voltage transducer, which is subtracted from a non-core storage drum, which outputs an electrical signal corresponding to the actual voltage value of zero, which is compared to the adjustable desired value of the yarn tension supplied as an electrical voltage. required values. The control circuit can also be switched so that the output voltage of the frequency sensor mi * is supplied instead of the voltage of the desired value. rotating the needle ring of the circular knitting machine, the output voltage of which is compared to the corresponding adjusted tachogenerator voltage, which is coupled by the selectromotor. In this way, the rotational frequency of the circular knitting machine can be firmly aligned.

Since the tachogenerator is coupled to an electromotor as an incremental source that sends a pulse train as an output signal that is converted into an analog signal in a voltage / frequency converter, the output pulse signal of the tachogenerator can be used to measure the length or velocity of the thread discharged from the niobium storage drum . The use of such a proprietary tachogenerator coupled to an electric motor driving a non-storage drum is not only costly but also undesirable in the regulation, since the inertia mass of the rotating system associated with the yarn supply drum is thereby increased, resulting in the control of the entire control system being adversely affected, so under these circumstances, it is not possible to adjust the thread changes quickly in succession.

Accordingly, it is an object of the present invention to provide a yarn feeding device in an electronic control device. without additional costs and without limiting the function of the yarn feeding device of the device for continuously controlling the yarn supply.

This object is achieved by the yarn supply control device of the yarn feeding device of the textile machine, the method comprising a first measuring circuit for processing the step frequency or a deriving frequency of the drive motor formed as a stepper a motor which drives the yarn stock drum and / or the exit signals or the signals of the rotary element derived therefrom, coupled non-slip with the yarn, a proximity sensor, and / or further comprises a second measuring connection for measuring the adjustable setpoint values of the yarn sender of the setpoint control device for feeding the yarns, the first measuring circuit giving characteristic pulse signals for the number of step pulses and / or for increasing the rotational speed of the rotary element, and the second measuring circuit generates characteristic pulse signals for the required values at the threading device and further comprises a data reading device which is scanned by thread length units and / or thread speed, 5 "popřípadě or thread tension, and through which the signals of the first or second measuring circuit are fed.

Since, in order to control the yarn supply, the output signals or the output signals of the sensors are processed in the electronic control circuit of the stepping motor of the yarn feeding device, the control device according to the invention does not need any intervention in the yarn feeding device itself. With the aid of the control readings provided by the device according to the invention, a permanent, precise control of the yarn supply without the need to use more different special devices. The sensor sensed by the rotating element may, for example, be a threading drum alone or a slipless signal transmitter coupled to the moving thread. In a preferred embodiment, the first measuring device comprises at least one pulse frequency computer to which the control pulse signals are fed and to which a control circuit of the data acquisition device is assigned in series.

Because:. for example: the frequency of the steps of the stepping motor driving the yarn feed drum through the yarn thread is directly proportional to the amount of yarn the timing unit or the rotating element is coupled to the yarn without slip, measuring the frequency counter of the conveyed quantity

threads per time unit accurately.

A substantial simplification of the electronics is that the first measuring circuit comprises a frequency divider preceded by a pulse frequency counter.

This frequency divider is expediently designed to be mounted and is assigned a device for selectively adjusting the partial results to easily perform, for example, a different calibration of the control pointing device (fbud in meters per minute or yin zaminutui. a frequency-control divider pointing device for subtracting the instantaneous value of a sub-result.

Since the cost of a frequency divider with non-integer partial results is considerable, another preferred device is that the frequency divider can only be set to integer partial results and the readout value of the control device is approximately within a predetermined range of errors measurement. According to the observation of errors, it is possible to determine the extent of measurement errors so that the accuracy of integer partial results achieved is sufficient for practical purposes. In a further preferred embodiment of the device, the pulse counter may comprise a time-adjustable gate, whereby, for example, the control indicator device can be finished.

In order to test the function of the control device properly, the pulse frequency computer can be connected to an optionally connectable reference frequency source. In multi-system circular knitting machines, it must be ensured that the same amount of thread is processed on the individual knitting systems during normal production of the soft goods. In particular, for the purpose of adjustment, it is desirable to be able to compare the amount of thread per unit of time set on one knitting system immediately with another supplied plurality of nitiod devices for feeding the thread of the next knitting system, thereby allowing the threading device to be aligned. Such a comparison is possible without a further control device according to the invention.

For this purpose, the first measuring circuit can be provided with switching means through which a counting pulse frequency or a frequency divider frequency is supplied to the computer of the pulses. At the same time, the device includes an input for connecting a reference frequency source and an input for the reference frequency source is coupled to

the pulse frequency comparator computer, from which the control pointing device is controlled. In this way, the alignment with the yarn supply conditions of the next yarn feeding device can be observed immediately on the control indicator device of one yarn feeding device.

The comparator means is provided with a device for comparative comparison.

If the pulse frequency of the just-observed yarn feeding device is the same as the pulse frequency of the compared yarn feeding device, the frequency ratio is 1 and the control device shows a value of 1.00. When the ratio of the two measured frequencies is mutually changed, the display value changes accordingly.

Such a simple comparative measurement is of particular importance when adjusting or adjusting the knitting system, particularly the circular knitting system. At the same time, the operating conditions of the machine can be checked during operation.

As is known, the consumption of single-turn yarn-machine-makers shifts from cold to warm. In order not to have all the already set up knitting systems 9 - 1 * 1 - still to be checked again during the heating phase, it is possible, for example, to observe only one thread feeding device as the "main thread feeding device" and all other thread feeding devices with respect to the thread delivery with compare it. In circular knitting machines, it is occasionally desirable to know the amount of yarn supplied per revolution machine or a predetermined amount of rotation frequency on individual knitting systems. This quantity can be accurately measured in a simple manner by the inspection device according to the invention. For this purpose, the device is preferably designed such that the first measuring circuit is provided together with a pulsation counter acting by a gate having a predetermined time interval during which the pulse frequency counter is effective, the gate being controllable by external signals. For this purpose, the gate may be connected to a signal output of an optoelectronic signal transmitter which is controlled by means of marks on the machine part relative thereto.

ylive, eg on needle veae-i-. In practice, it can be accomplished in such a way that the light-stripe-like marks are adhered to the movable part, e.g. - on the needle tower of a circular knitting machine,

The gate may optionally be connectable with the associated engagement means, and thus, according to the measurement procedure, the apparatus is made switchable.

The gate may also be provided with signaling means of its operational state which show at least the beginning of the measurement and thus considerably facilitate the handling of the apparatus.

When, in the regulating circuit, a setpoint transmitter for the yarn tension transmitter is constituted by a constant current excited by a DC torque transmitter whose position is removable by the path control transmitter, the second metering connection is provided with a stage for processing characteristic excitation control signal signals. current or voltage corresponding to the thread tension. In this case, it is advantageous if the second measuring circuit is provided with a functional generator which at least approximately simulates the transmission function of the torque transmitter and the transmission path lying between the yarn scanning point and the input of the torque transmitter or the source of the constant current supplying it.

The yarn supply control device according to the invention can be separately integrated in the yarn feeding device in such a way that both the measuring circuit and the control indicator device can be arranged directly in one housing part and the yarn feeding device.

In addition, however, it is also possible for such an embodiment to be embodied as a portable or mountable stand-alone unit provided with connection devices for at least one connecting line to electrically connect the stepper motor or sensor or to control circuitry to maintain a constant thread tension.

This unit may be provided with a switching means for inputting a reference frequency pulse source provided with a switching means for signal input to the frequency divider, wherein the switching and switching means are locked relative to one another so that erroneous operation and thus erroneous operation are avoided measurement.

A very simple and easy-to-handle design of the whole apparatus is such that the optoelectronic signal transmitter is built into the structural unit, but the aforementioned sensor, which is preferably provided with a light pBaB, can be connected to the signal input via a connecting line. pefo

Such a light pattern may then be tucked into a suitable recess or holder of the feed device and there may be sensed increments of signals on the threaded drum or on the piece rotating thereon or otherwise modified the measuring disc.

1 shows a device according to the invention, which is designed as a portable structural unit, in a first simple embodiment, in a side view, with a representation of control indicator devices, FIG. Fig. 1 shows a schematic diagram of a first measuring connection of the device of Fig. 1; Fig. 5 shows a block diagram of a second measuring connection of the device of Fig. 1; 1, in perspective schematic view, FIG. -I. Fig. 7 shows a device according to the invention, which is designed as a portable construction unit, in a second embodiment, in a side view, showing the switching, switching and indicating means; Fig. 8 shows a block diagram of the first measuring connection of the device of Fig. 7 and Fig. 9 shows a partial perspective view of a signal transmitter adapted for connection to the device of Fig. 7, measuring the fiber movement speed directly.

1 to 4 is intended to control the yarn feeding of the yarn feeding device, the basic embodiment of which is shown in FIGS. 5 and 6.

This yarn feeding device consists of a housing 1 (which carries a holder 2) for mounting on a retaining ring, e.g. a circular knitting machine (not shown), and also an electrical connection (not shown) for electrical and electronic components disposed within the housing. 1. -3 ^ -

As can be seen from Fig. 6, an electric stepper motor 3 is arranged in the upper part of the housing 2, which protrudes through its shaft with an adequate opening formed in the front wall of the housing 2, wherein the rotatably mounted stock drum b is driven on the shaft by this shaft. The bunkers 2 consist of a hub 5 mounted on a shaft and a plurality of U-shaped wire yokes fixed by their ends in the hub 5. The wire yokes have the carrier portions 2 substantially parallel to the hub axis 5 and the yoke guide j3 ·

In addition to the yarn stock drum 2, yarn guide elements are arranged on the housing. A guide loop 22 is formed in the holder 2 fixed to the housing 2, a yarn tensioning hook 13 is disposed on the front side of the housing 2 near the storage drum 4 and two guide lugs 21/15 are fixed on the housing 2 on the output side of the drum 2.

From the source (not shown), for example, from the supply coil, the thread 16 extends through a guide eye 22, a adjustable disc brake 17 located on the holder and a swivel tension hook 13 on the guide bevel 2 of the wire shafts 6 of the storage drum 2 which causes the thread to be displaced on the carrier. therefore, only a predetermined number of storage coils, which together with the narrow support part 2 guarantees the non-slip entrainment of the yarn 16 along the periphery of the storage drum 11, remain in the wire yoke portions 2 /.

From the storage winding on the drum 4, the first fixed eyelet 14 extends outwardly 16, from there another guide eyelet 18 provided at the end of the movable driving element formed as a guide arm 20 pivotally mounted on the pin 19 and from there to the other fixed The guide eyelet 15, which is arranged slightly lower but sideways in the immediate vicinity of the first eyelet 14. From the second guide eyelet 15, the yarn comes out to a consumer (not shown) in the knitting machine for needles at the knitting site. and

A pivoted guide arm 20 with a guide eye 18 on the output side of the storage drum 4 forms between the two movable guide eyelets 14, 15 an extensible, substantially V-shaped insertion track which represents a yarn reserve whose magnitude depends on the angular adjustment of the guide web 20.

A small DC motor 22 is mounted in the lower housing part 21 on its front wall, which protrudes through its aperture through a respective aperture in the front wall of the housing part 21, with a substantially L-shaped control lever 23 being mounted on the shaft, the free end unilaterally supports the guide arm 20 and tries to rotate it counterclockwise as shown in FIG.

A permanently excited DC motor 22, preferably designed as a hollow rotor motor, acts as a torque generator and can also be replaced by another generator similar to a magnetoelectric meter, etc. It constitutes a desired source electromagnetic source regulating a yarn tensioning force which actuates the actuating lever 23 on the guide arm 20 and its eyelet 18 with a predetermined predetermined adjustable force. This desired force is directed against the yarn tension dependent on the yarn tension and caused by the yarn passage 18, i.e. in FIG. 6, the desired force is directed to the left. A source 24 of optical signals is connected to the pin 19 of the guide arm 20, which senses the angular adjustment of the guide arm 20 and outputs the respective electrical signal of the size setting of the aforementioned yarn reserve.

The optical signal source 24 consists of a light diode 25 and a phototransistor 26 lying in the beam path of the light diode 25, the diode 25 and the phototransistor 26 being disposed on a bracket 27 mounted on the housing member 21. In the beam path of the light barrier thus formed, the plate curtain 28 fixed to the pin 19 of the guide arm 20 extends more or less with its edge portion, wherein Λ

□ The shape of the county part corresponds to some suitable function, for example e-function. The dependence on the rotation of the guide arm 30 results in an analogous electrical signal to the output of the phototransistor 26, resulting from a fixed function dependence of the plate diaphragm 28 on the rotation of the guide arm 20.

The pivoting movement of the guide arm 30 is bounded by two stop pins 39, 30 in both directions of rotation. Not being removed, the guide arm 30 is in the proximity of the stop stop pin 29, moving with increasing yarn movement speed, ie, increasing the rotational speed of the yoke. of the drum 4, to the right to the second stop pin 30, without reaching it at normal operation. The guide pins 39 or 30 abut the guide rail 40 in the event of equipment failure

The electrical connection of the stepper motor 3 to drive the drum 4 and the DC motor 22 as the source of the controlled value is shown in Fig. 6 in the basic embodiment. ....... <. The analog signal supplied by the phototransistor 26, which is characteristic of a certain position of the guide arm 20 '' '', is fed through the filter 49 and the voltage follower 31 to the control circuit 32 in which the signal is adjusted and the output signal is converted 33 shows a pulse train of a certain frequency, which is shown in FIG. 6 and which is fed to the control electronics 34, which then supplies a control signal in the form of a suitable pulse train through the power output stage 35 to the stepper motor 2. The filter 49 removes the sources 24 of the signals of the rising analog signal of the higher frequency; the voltage tracer 31 outputs an output signal with a relatively lower starting impedance, which is dependent on the current rotation of the guide arm 20. The voltage potential of this output signal basically consists of two integrators 36, 37, which have a time constant matched to the respective triggering or deceleration characteristics of the stepper motor 2, thereby limiting the early signal frequency of the output signal 33 during start-up or deceleration. the motor 3 so that the change of frequency can follow up with the stepper motor 2 loaded from the thread of the yarn supply drum 4 During the start-up of the stepper motor 2, the yarn consumer covers its consumption from the yarn reserve, whereby the yarn tension remains at the desired value due to the required torque of the DC motor 22 independent of the angular adjustment. At the same time, the stepper motor 2 can accelerate the frequency of rotation of the supply drum 4 to a value corresponding to the required speed of the yarn movement to a time whose length is determined by the triggering characteristic and ensures that the stepper motor 3 remains in operation through the output signal 33. .

The integrator 36 limits the rate of change of the stepping frequency of the stepper motor, while the integrator 37 limits the frequency change rate to a value that is below the runtime characteristic of the stepper motor 30, until the starter motor J3 follows the exact frequency of the control signal 33 with the unit formed from the integrators 36. 37, a diode array 38 is connected in series, the output of which is connected via a further filter 39 to a voltage transducer 40, and a frequency output signal 33 is provided. The diode system 38 establishes a wiring that prevents the signal transducer 40 from being applied to the voltage and frequency transducer, which would cause the superfluous motor 3 to temporarily output a control signal with an inadmissibly lower frequency. The filter 39 prevents the voltage and frequency converter 40 whose output is created with a zero point suppression and whose characteristic has a variable slope in order to adjust. - 2ϋ - the angular adjustment of the guide arm 20 and hence the size of the yarn reserve for a certain stationary yarn movement speed. In addition, the analog output voltage signal is fed from the voltage follower 31 via a potentiometer 41 to the decoupling member 42 where it is split. The output of the derivative member 42 is connected to the second potentiometer 45 via a summing member 43 and a follower 44, which allows to set the effective torque of the DC motor 22 and thus the yarn tension setpoint.

An adjustable constant current source 46 is connected to the potentiometer 45, which is driven by a constant current through the power transmission stage 47 of the DC motor 22.

The function of this electronically controlled yarn feeding device is as follows: When a control deviation occurs, for example when the yarn consumption is reduced, the guide arm 20 starts to shift its desired positions so that the analog feed signal applied to the connection piece 32 causes a corresponding change. a reasonable impulse control signal 33 for the stepper motor 3 for the stepper motor 3 to change sense in order to change the rotational speed of the stepper motor 3 I,

and thereby also changing the speed of the yarn movement until a steady state is reached, in which the guide arm 20 assumes a fixed position in which the yarn tension is in equilibrium with the desired force magnitude exerted by the control lever 23. the control lever 23 and the guide arm 20 are constant, is a steady state constant at each thread speed, and thus at each consumption per time unit within the thread tension control range. The controller is integrated. An external control signal from an external source, for example from a central control device for either all or a number of devices for feeding the thread of the circular knitting machine to the controllable input of the source 46, can be fed via the splitter 48 and the addition member 43. which allows remote adjustment of the torque of the DC motor 22 and thus the thread tension.

In order to control the amount of nitrite applied to the unit of time in the described yarn feeding device, i.e., the speed of the yarn movement to the knitting location and the set yarn tension, as well as possibly the length of the yarn being conveyed, over a certain period of time, an electronic yarn has been constructed. a control device whose details are

1 to 4 and which is provided as a portable or mountable special modular unit disposed in the housing 50 shown in FIGS. 1 and 2 in front or rear view.

On the rear side of the housing 50 (FIG. 2) there is provided a connection in the form of two measuring sockets 51, 52 adapted for the input signal and connected by means of plug-in connecting lines with two corresponding measuring sockets 53, 54 of the control device for feeding it The measuring socket 53 is connected to the input of the stepper motor 2 and therefore delivers the control pulse signal for the step frequency of the stepper motor 3 which is supplied to the measuring socket 51 of the control device, while the other measuring socket 54 is connected via the source 46 of the fixed step. and a power transmission stage 47 to the input of the DC motor 22, and for which the set constant excitation direct current signal is supplied to the measurement socket 52 of the control device. Alternatively, the measuring socket 53 may also be disposed immediately at the exit of the connector 32 so as to override the control pulse signal 33, which is also intended for the frequency of the steps of the stepper motor. In the housing 50, a first measuring circuit 55 (FIG. 3) and a second measuring circuit 56 (FIG. 4) are formed on the sinker, the inlet of which is connected to the first measuring socket 51, res-pective with the second measuring socket 52, the circuit 55 serves to control the feed rate and / or the speed of movement of the yarn and the second measurement connection 56 serves to control the yarn tension.

The first measuring circuit 55 comprises a pulse frequency counter 57, one input 58 of which is connected via a switch 59 according to the method of choice either directly to the measuring plate 51 or to a frequency divider 60 which is connected to the measuring socket 51 on one side. as an adjustable frequency divider that can only be set to integer proportions. A coding switch 61 provided with a digital control device 62 for the currently set partial ratio serves for this setting. In the illustrated position a * of the switch 59 there is a frequency divider 60 between the measuring receptacle 51 and the pulse wiper 57. In the next position b of the switch 59, the input 58 of the pulse frequency counter 57 is connected directly to the measurement socket 51, while the second input 63 of the pulse counter 57 is connected to another measuring socket 64 to connect the reference frequency source. pulses, which may for example be a further device for feeding a circular knitting machine with whose measuring socket 53 a measuring socket 64 is connected by a respective connecting cable, so that it receives a pulse signal of the frequency of steps of the stepper motor 2 of this additional yarn feeding device. The output side of the pulse frequency sealer 57 is connected via the control electronics 65 to the digital LCD or to the LED control device 66 which, in the manner shown in FIG. 1, shows readable values on the front of the housing 50. In the pulse frequency seal 57, the source of the test frequency that is connected when the switch 67 is in the position shown in Fig. 3 is integrated so that the control device 66 shows a value of 10,000,000 f corresponding to 10 MHz. In another switch position 67, the test frequency source is turned off and the pulse frequency seal 57 processes the step frequency signals fed through its inputs 58, 63.

The current is supplied by a measurement circuit 55, 56 of a source 68 of direct current through a circuit breaker 69 which is operable from the outside of the housing 50 (FIG. 2), wherein the wiring condition is controlled by the inspection light 70.

The first measuring circuit 55 operates as follows:

The yarn is conveyed through the yarn stock drum 4 &apos; driven by the stepper motor 3 in a substantially slip-free manner, which means that the actual yarn feed rate per unit time is directly proportional to the number of steps of the stepper per second, i.e. its step frequency.

Provided that the length of the yarn to be fed is a single turn of the stock drum 4, which is, according to the experience of the yarn tension and the yarn type, very slightly changed, and the step angle of the stepper motor half step, or 1.8, is e.g. at a step frequency of 5,000 Hz, the actual transported rate per unit time in metros per minute: 0.2 m. 1.8. 5000. 60 with 360 ’300 m. This implies that, with a simple but precise counting of the frequency of steps, the transported amount of unit time can be fixed. Simultaneously, the counting of pulses during a predetermined longer operating time, for example during the incorporation of one ring, can directly determine the amount of yarn consumed.

On the digital control device 66, it is possible to indicate the instantaneous frequency of the steps of the stepper motor 3, but this is only applicable for special purposes. In fact, however, the control device 66 is calibrated so as to show the instantaneous amount of yarn being conveyed per unit time, i. yarn movement speed in meters per minute.

In order to indicate the amount of thread supplied, the unit of time in conventional units, e.g. in meters or yards per minute, a frequency divider 60 with an associated calibration switch 61 must be used. The frequency divider 60 is set to an integer result so that it gives an approximate value within the predetermined range of the actual value measurement error. In the foregoing exemplary embodiment, the amplification of the exact result value of the divider 60 would be set to the amount of thread fed 300 m. min at 5,000 Hz to 5000 = f300 16,666

Since division by decimal number would require significant costs for electronic circuitry, it will be connected to integer sub-result, rounded to 17f by coding switch 61, in frequency converter 60, that is, a measurement error will have to be expected.

which occurs, so that instead of the amount of thread being fed, 300 m. In this example, only 5,000 17,294.11 m. will be shown on the indicator. The resulting measurement error is within 2%.

Alternatively, the diameter of the yarn feed drum Js may also be selected such that, with the integer partial result selected, the measurement error may be zero or any arbitrarily chosen minor negligible size, for example, when the supply drum 4 transports a single yarn 0.1962 m of yarn. When changing the setting to other measuring units of the measured values, only the coding switch 61 needs to be appropriately set, the setting being controlled by the digital control device 66.

After adjusting and determining the reading method, the following values could be subtracted from the control device indicator 66 after approximately one second of the measurement duration: a) Test position of switch 67: 10,000 ... corresponds to 10 MHz and - - b) Position "operation" "of switch 67 and position b of switch 59: step frequency of stepper motor 3 in Hz c) Position" operation "of switch 67 and position« and of switch 59: delivery amount of thread supplied per unit. -1 time in m.mm At the position b1 of the switch 59 and through the measurement socket64 connected to the input of the stepper motor 3 of the next yarn feeding device, step frequencies are fed through the inputs 58, 63 of the pulse frequency counter 57, and in the pulse frequency computer 57 they are then compared with each other by means of a comparative measuring device. If both frequency values are the same, the control device 66 shows a value of 1.00. Also, when the ratio of the two measured frequencies changes with each other, the indicator changes accordingly.

This comparative measurement is particularly important when adjusting or adjusting in particular multi-system circular knitting machines. By means of the electronic yarn feeding device and the first measuring circuit 55, a simple comparative measurement can be carried out by an intermediate adjusted and corrected point of feeding by the yarn knitting system and by each subsequent feeding point. a yarn knitting system 11 for adjusting and rigging. Continuous inspection is also possible.

The second measuring circuit 56 shown in FIG. 4 simultaneously shows the voltage of the yarn being fed, which is seen on the digital control device 71 of the type LCD, where the analogue display device could also be a location. The control device 71 is calibrated directly in voltage units such as grams or mN. The fiber tension measurement is based on the fact that the direct current of the DC motor 22 is directly proportional to the torque applied to the control lever 23 and therefore represents a measure for setting the desired yarn tension. However, this excitation current is not easily measurable because it has a relatively small size and, in addition to the constant current source 46, a synchronization current of about 25 kHz is supplied via a power transmission stage 47. On the basis of this, the input of the constant current source 46, which is directly proportional to the constant current being transmitted, is fed through the measuring sockets 54, 52 to the second measuring circuit 56. This voltage is applied to the inverted input of the phase reverser member IC72 whose output is via a resistor 74 and a transistor coupled to an IC 75 member that forms part of a function generator step 76 from whose output 77 a control device 71 is controlled by a respective control electronics, which may be calibrated, for example, from zero to 10.

The functional generator stage 76 is therefore needed because there is a linear relationship between the control current of the constant current source 46 and the DC current of the DC motor 22, but the functional dependence between this control voltage and the respective yarn pulling force in the eyelet 18 on the guide arm end 20 is not linear. This is due to the fact that the frictional force between the yarn and the eyelet 18 of the guide rock 20 is dependent on the yarn tension and also that additional nonlinearities may occur in the resulting transfer function due to the DC motor 22. The functional generator stage 7 has a transmission characteristic that essentially corresponds to a cut-out of some trigonometric function that can be reproduced approximately as an e-function.

The potentiometers 79, 80 allow, as a factor, the step 76 of the functional generator, or the control device 71, to be influenced, for example, by the use of the most strongly different friction values, to compensate for the 3 - occurring or due to changes. in the thread path etc. (conditional deviations from the set basic values.

The supply of current to the second measuring circuit 56 is accomplished by using a socket 78 of the source 68 of the direct current fobr. 3). In addition, the pulse counter 57 of the first measurement connection 55 may also have an adjustable gate which allows the inspection device 66 or the length of the conveyor thread to be measured for a certain period of time.

7 and 8 show a modified embodiment of the device according to the invention, which has additional functions and other applications. This embodiment not only makes it possible to measure and indicate the amount of thread fed in a particular period or frequency of steps of the stepper motor 2 of the yarn feeder, but also to measure the amount of yarn supplied, e.g. the previously described comparative measurements in the embodiment of FIGS. 1 to 6 are retained.

FIG. 7 shows only a plan view of the device housing. There is a longitudinal, rectangular shape and dimension that the device can be hand-held comfortably so that measurements can be made directly to the machine in a simple manner. By pressing one of the buttons 81, 82, 83 which are electrically locked relative to one another, the device can be set to the desired measuring function:

Button 82 activates the device for measuring quantity per time unit, eg in m, min. or in inches per second, depending on the switching on of the apparatus, the measurement may be either indirectly by measuring the frequency of the steps of the stepping motor driving the conveyor drum of the yarn feeding device or by measuring the output variable of the rotary element of the rotating element slidably coupled to the thread or directly measuring the sensing wheel signal without slipping connected to the running thread.

If the button 81 is depressed, the amount of thread supplied can be measured in advance of a given section, e.g. Finally, by pressing the button 83, the apparatus is switched to a comparative measure of the amount of yarn, which, for example, permits the immediate comparison of the amount of yarn through the knitting systems of one circular knitting machine. The measurement can also take place here, as explained with reference to button 81, also when the buttons 82, 83 are operated directly or indirectly.

In order to select different types of measurements, the first measuring circuit 55 is formed essentially as shown in FIG. 8; the second yarn measuring circuit 56 is the same as the one previously described and is therefore not shown in FIG.

In 4 *, the pulse frequency counter 57 controls, via the control electronics 65, a digital control device 66 of the LCD or LED type, which is readable from the front of the housing 50. The frequency divider 60 upstream of the frequency counter 57 has already been clarified for its purpose, as well as the calibration switch 61 with the control indicator 62 and the switch 67 for the integrated source of the test frequency of the pulse frequency counter 57. and

The first input 58 of the pulse frequency seal 57 is connected to the output of the differential OR 84, while the second input 63 of the pulse sealer 57 is connected directly to the measuring socket 64 for connecting the pulse frequency source.

Both inputs OR of member 84 are connected to outputs of two summing members 85, 86, of which A member 85 is connected to the input port 60 with a frequency divider 60, and with a button 82 which allows it to be controlled, while at the other input A member 85 is supplied with a voltage, e.g., 5 volts.

A frequency divider 60 input is connected to a measurement socket 51 and a single input of the second A member 86. A button 81 is connected to the second output A of the member 86, which allows a positive voltage, e.g., 5 volts, to be applied to this input when actuated. The third input A of the member 86 is connected via a diode 87 to a third button 83 so that a positive voltage, e.g., 5 volts, can be applied to the third input when the third button 83 is actuated.

An additional diode 88 permeable in the same direction is connected in parallel to the diode 87 between the two buttons 83, 81. In addition, a second and third input A of the member 86 is connected, which allows the pulse frequency counter 57 to be activated only at predetermined time intervals when the button 81 is actuated, such that it can count the pulse signals supplied to the first measurement circuit 55 , only within a certain period of time bounded by the outer gate signals.

The gate is formed by two bistable D flip-flops 89, 90, with two inputs CK and D and two outputs Q and Q and one return input R. The ground input 33 is connected to the frame.

Both flip-flop members 93, 90 are connected such that the output Q of the flip-flop member 89 is connected to the synchronization output CK of the second flip-flop member 90 and the input D of the first flip-flop member 89, while a light-emitting diode is connected to the output Q of each flip-flopping member 89, 90 91 and 92, respectively, which, together with the third light-emitting diode 93, are connected to the output Q of the second tilting member 90 visible on the front side of the housing 50 (FIG. 7). All three light-emitting diodes 91, 92, 93 are grounded across one common resistance 94 .

An output A of the member 95 is connected to the input CK of the first flip member 89, the first input diode 93 of which is connected to the input D, as well as the output Q of the second flip member 90. optoelectronic sensor form of light barrier 97 with reflector.

The reflector light barrier 97 consists of one IR transmitting diode and one photodiode arranged spatially in such a way that, by means of a single reflector reflector 98, a metallic reflector, light, adhesive strips, etc., disposed at a distance of approx. 10 to 40mm, sufficient changes in the signal level to trigger the next signaling stage 96 are output at the exit of the reflector light 97. The appropriate automatic correction level causes automatic adaptation of the light conditions of the measuring point, so that even in the case of a relatively strong foreign light, the necessary step or delta sensitivity remains. The automatic level correction step 96 and the signal trigger include a differential member through which the trigger pulse to the first input A of the member 95 occurs.

The transmitting diode and the receiving photodiode light reflector 97 are arranged in the manner indicated in FIG. 7 on the front of the apparatus housing 50 behind the transparent housing, so that, when appropriately approaching the apparatus housing 50 to the reflector 98 located, for example, on the needle filament &apos; triggering signals may be generated by the circular knitting machine.

The two return inputs R of the two tilt members 89, 90 are connected via an Ohm voltage divider formed by two resistors 100, 101 and one capacitor 99 arranged. is - parallel to one resistor 100, to button 81.

The connection described works as follows:

Suppose it is necessary to measure the amount of thread delivered per revolution of the needle knitting machine on a knitting system. In this case, the circular knitting machine will be equipped with an electronic yarn feeding device as shown in FIGS. 5 and 6. The measuring housing 51 will be connected by a suitable connecting line to the measuring socket 53 of the electronic yarn control circuit of FIG. so that a pulse signal characteristic of the stepping frequency of the stepper motor 3 is fed through the measurement socket 51. The button 81s with the "mm / U" mark is compressed. A reflective tape is affixed to the winding of the circular machine, with a mark, the housing 50 of which is from 10 to 40 mm away from the reflective strip which is the reflector 98.

Pressing the button 81 simultaneously controls the contact 102, by means of which the power supply of the entire integrated circuit of the device is connected via an electronic circuit (not shown). At the same time, the return ports R of the two flip-flops 89, 90 will be briefly activated from the button output 81 via the resistor 100 and the capacitor 99 so that the flip-flop members 89, 90 are reset. In this original state, the outputs Q of the two flip-flops 90, 90 have a "L" level, while the outputs Q are at the "H" level. Thereby, the diode 93 with the "set" is set, while the two remaining light diodes 21, 92 with the "count" or "block" mark are not activated. In addition, the second input A of the member 95 is associated with the level "H". And the member 85 is locked while its second input, since the button 82 is not actuated, is at the "L" level. The first input of the next A member 86 is fed through the measuring jack 51 with positive step pulses 3 while the other input of this A member 86 is held at the "H" level by the button control 81. Due to the diode 88, the third input A of the member 86 remains first at the "L" level. Thus, the member 86 is locked so that the step pulses coming through the measuring socket 51 do not reach the computer 57 of the pulses and cannot be summed there. Therefore, the pulse frequency is ineffective.

When the aforementioned mark on the reflector 98 now disappears, the corresponding impulse is provided, with the result that, at the output of the automatic level correction step 96 and the trigger signal, a side of the trigger signal is present. Thereby, the previously locked A member 95 connects with the result that the positive trigger signal face reaches the clockwise input CK of the first flip member 89 and transfers it to another state in which its output Q is at the "H" level and the output Q 1 at the "L" level. In this way, the second light-emitting diode 91 with the "count" is now activated.

At the same time, however, the third input A of the member 86 is also provided with a "H" level so that step or general count pulses are fed to the second input OR member 84 via the measurement socket 51, which in turn leads to the first input 58 of the pulse frequency computer 57. Thereby, the pulse frequency seal 57 becomes effective; the counting pulses supplied to it now count.

By further reflection on said reflector mark 98 of the light barrier 97 triggered by the nearest trigger signal, it is fed to output Q of the first flip member 89 again at the "L" level, while its next output Q is at the "H" level. This results in the second flip-flop member 90 being switched, so that its output, Q, reaches the level "H" while its next output Q reaches the level "L". As a result, the third light-emitting diode 92, called " block " is activated while both remaining light-emitting light-emitting diodes 91, 93 " count " In addition, the level "L" of the output Q of the second tilting member 90 is disabled. Since the output Q of the first flip member 89 has reached the level "L", such an A member 86 is locked, with the result that no further step or count pulses from the measurement socket 51 to the pulse frequency computer 57 occur. *

The pulse counting process is thereby terminated and the control signaling device 66 immediately shows between the two consecutive trigger pulses, e.g., a machine turn, the thread feed rate in mm per revolution or in inches per revolution.

If the described counting process is to be repeated, this will happen after the button 81 is pressed again.

Apparently the measurement process is particularly simple and easy to operate. After engaging the circular knitting machine and arranging the device housing 50 at a distance of 10 to 40 mm to the light reflecting reflective markers 11 on the needle, only the button 81 is to be pressed, whereby the "set" light emitting diode 93 shows that the device is ready for measurement. As the gauge mark disappears, the second light-emitting diode 91 lights up, indicating "count", which indicates the start of the measurement. After exactly one revolution of the machine or the second disappearance of the measuring mark, the third light-emitting diode 92 lights up with the "block" mark, while the two remaining light-emitting diodes 91, 93 extinguish, indicating the end of the measuring process.

If it is necessary to measure the speed of the thread feed, eg in m. min. is the M «X * Press the 82 button. This will give the second input A of the member85 to the" H "level. The frequency dividers 60 are fed with a stepper pulses 51 of the stepper motor 51, whose positive output pulses pass through the A member 85 and the permeable OR member 84 into the pulse frequency computer 57 and are counted there. The pulse frequency counter 57 comprises, just as in the formerly described first embodiment, a crystal-controlled oscillator 103, with an integrated separation stage for adjusting the setting, as well as a pre-selectable gate of the pulse frequency counter 57. This gate is set to 1 second in the present case. The control indicator device 66 shows the velocity of movement of the supplied thread, e.g., in m. min. as previously explained.

In this measurement method, A member 96 is locked while its second and third inputs remain at "L" level.

If the measuring device is to be used for comparing measurements between the velocities of the supplied yarns, eg two knitting systems of a circular knitting machine, it is necessary to press the button 83. The step or count pulses of the two aligned yarn feeding devices are fed through both measuring sockets 51, 64, of which the second measuring socket 64 is directly connected to the second computing input 63 of the pulse frequency counter 57. The member 85 is blocked while its second entry relative to the uncontrolled button 82 is at the "L" level. the count pulses fed through the measurement socket 51 pass through the pass-through A member 86 and the connected OR 84a to the first counting input 58 of the pulse frequency counter 57. Therefore, the member 86 is permeable because its second and third inputs via diodes 88, 87 and button 83 exhibit an "H" potential. Comparison of the frequencies between these via the measuring points 51, 64 supplied by the two pulse frequency signals is carried out by a ratio device in the pulse frequency counter 57 as previously explained in the first embodiment. in

Pulse Frequency Counter 57, by the way, is designed to switch to count different phenomena,

frequency and frequency measurement. The current mode of operation is automatically set by means of an electronic switch 104, by controlling one of the buttons 81, 82, 83, for which its input 105, for "measuring the phenomena" is connected to the output of the button 81, its next input 106, for "frequency measurement" is connected to the output of button 82a, finally its last input 107, for "for frequency measurement", is connected to the output of button 83. The meter is indeed universally replaceable when it can also process signals from a special sensor or transmitter by its first described measuring circuit measured values of the running thread. An example of such a running thread of an instantaneous measurement transmitter is shown in FIG. 9:

The feed yarn 16 is wound around a rotatably mounted drive wheel 110 and thus slidably coupled thereto. The measuring wheel 110 is rigidly coupled to the measuring disc 111 formed, for example, as a disks by sectors, the light and dark areas of which are sensed by a fork-shaped light barrier 112. Output signals from the forked light barrier 112 are fed

These signals are sent to stage 114 which includes a pulse former and a frequency doubler from which the counting pulses characterizing the frequency increment of the measuring disc 112 are fed to the measuring plate 51 or 64 the first measuring circuit 55, Mpfr according to FIG. 8.

The sensing wheel 110 may be embodied as a rotatable element in the path of movement of the locomotive with which it is slip-free, e.g., as a yarn storage drum of a mechanical yarn feeding device. In Offl, it is inconceivable to bond the measuring disc 111 in the photo of the pressure-sensitive film to the yarn storage drum or to the rotating element and thus to measure the increment of rotation and hence the speed of the yarn movement.

A &amp; no may be available instead of the 112 fork light barrier. The use of so-called optoelectronic capsules 115, which in principle consist of a light barrier similar to the light receptacle 97 and feeds successively adapted input signals to the first measuring device 55 via successive signal processing stages and pulse forming.

If such an optoelectronic piston is used, then the device can be arranged such that a suitable aperture can be provided in the yarn housing or in the holder for this purpose. This is where the measuring disk 111 will be located and which will then be optically sensed by the measuring disk 111 with its uniformly applied angular marks.

The light barrier 97 with the reflector of the first measuring connection 55 may be detached from or removed from the apparatus housing 50, whereby a Vhd &amp;amp;

Claims (23)

OBJECT OF THE INVENTION CLAIMS 1. A yarn supply control device for supplying yarns to textile machines, comprising a non-slip yarn feed drum, comprising a first measuring circuit (55) processing a step frequency or a derived drive frequency. an engine formed as a stepper motor (3) which drives the yarn storage drum (4) and / or the output signals or the signals derived therefrom of the rotary element (111) coupled without slip with the yarn, the non-contact sensor (112) and / or or further comprising a second measuring circuit (56) for measuring the adjustable yarn tension setpoint values of the control circuit of the yarn feeding device, wherein the first measuring circuit (55) outputs a number of step pulses a / or, for an increased frequency of the rotating element, a characteristic pulse signal and a second measurement connected (56) emitting characteristic pulse signals for the desired yarn tension values, and further comprising a control device (66, 71) which is corrected in yarn length units and / or yarn movement or yarn tension and to which the first yarn signals are fed. or a second measuring connection (55, 56). 2. Device according to claim 1, characterized in that the rotating element is a yarn storage drum (4). 3. Apparatus according to claim 1, wherein the rotatable element is a sensor-free sensor element (110, 111) coupled to the feed current. Apparatus according to one of the preceding claims, characterized in that the first measuring circuit (55) comprises at least one pulse frequency counter (57), the pulse control signals being fed and the control wiring connected in series. 65) a control device (66) for reading the data. 5. Device according to claim 4, characterized in that the first measuring circuit (55) comprises a frequency divider (60) upstream of the pulse frequency counter (57). 6. Apparatus according to claim 5, characterized in that the frequency adjuster (60) can be assigned to a device (61) for selectively adjusting the partial results. 7. Apparatus according to claim 5, characterized in that the frequency divider (60) comprises a control indicating device (62) for the instantaneous value of the sub-result. 8. Apparatus according to claim 6 or claim 7, wherein the frequency divider (60) is adjustable only to a non-integer partial result and the display values of the control device (66) have an approximate value within a predetermined range of measurement errors. 9. Apparatus according to one of Claims 4 to 8, characterized in that the pulse frequency computer (57) comprises a time-adjustable gate. 10. Apparatus according to one of Claims 4 to 9, characterized in that the pulse frequency computer (57) is connected to an optional, comparable frequency source. Apparatus according to one of Claims 5 to 10, characterized in that the first measuring circuit (55) is provided with a switching means (8S, 13); through which the frequency counter pulses or the frequency divider (60) of the frequency divider (60) is inputted to the pulse frequency counter (57), further comprising an input (64) for connecting the comparative frequency source and that the input frequency source input (64) is associated with the comparator means a pulse frequency counter (57) from which the control pointing device (66) is controlled. 12. Apparatus according to claim 11, characterized in that the leveling means is provided with a device for leveling. Apparatus according to one of Claims 4 to 12, characterized in that the first measuring circuit (55) is provided with a pulsating gate having a predetermined period of time, together with a pulsation counter (57). the pulse frequency sealer (57) is effective, the gate being controllable by external signals. 14. Apparatus according to claim 13, characterized in that the gate is connected to a signal output of an optoelectronic signal transmitter (97) which is controlled by means of markers (98) on a relatively movable part (5). 15. Apparatus according to claim 13, characterized in that the markers (98) are glued on the movable part, for example on a needle-shaped knitting machine. 16. Apparatus according to claim 14 or 15, characterized in that the gate is selectively engageable by means of an associated engagement means (81). 17. Apparatus according to one of claims 14 to 16, characterized in that the gate is provided with signaling means, for example the light diodes of its operating state. Apparatus according to any one of the preceding claims, characterized in that the setpoint transmitter is constituted by a constant current driven by a DC torque emitter (22), the position of which is detectable by means of a tracking transducer (24), the second measuring the circuitry (56) is provided for (73, 76) to process characteristic signals of the excitation current control voltage or voltage corresponding to the yarn tension. 19. Apparatus according to claim 18, wherein the signal processing stage is provided with a functional generator (76) which at least approximately simulates a transmission function of the torque transducer (22) and the transducer path located between the scanning location (18). the thread (16) and the input of the torque transmitter (22) or the constant current source (46) supplying it. Apparatus according to any one of the preceding claims, characterized in that it is designed as a portable or mountable, separate contactor with a connection device (751, 5264) for at least one connecting line for the electrical connection of the stepping motor (3) or the sensor (112). ) or a control connection for maintaining a constant thread tension. 21. Apparatus according to claim 5, 11, 16 and 20, characterized in that the structural unit is provided with a change-over or 5θ3 button for input (64) of the reference frequency pulse source provided with for gate signaling and, optionally, switching means, mapping means 82 for signal input to frequency divider 60, wherein switching and switching means are locked relative to each other. 22. The apparatus of claim 14, wherein the optoelectronic signal transducer (97) is built into the structural unit. O? v i i t t '' ** 23. Apparatus as claimed in claim 1, characterized in that the apparatus of claim 1 is provided. 15> / s is equipped with a light cursor (2/1 x. w