EP0305811A2 - Vorrichtung zur Überwachung der Fadenliefervorrichtung für Textilmaschinen - Google Patents

Vorrichtung zur Überwachung der Fadenliefervorrichtung für Textilmaschinen Download PDF

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Publication number
EP0305811A2
EP0305811A2 EP88113377A EP88113377A EP0305811A2 EP 0305811 A2 EP0305811 A2 EP 0305811A2 EP 88113377 A EP88113377 A EP 88113377A EP 88113377 A EP88113377 A EP 88113377A EP 0305811 A2 EP0305811 A2 EP 0305811A2
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EP
European Patent Office
Prior art keywords
thread
pulse frequency
frequency
measuring
gate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP88113377A
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German (de)
English (en)
French (fr)
Inventor
Gustav Memminger
Falk Kühn
Heinz Fabschitz
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Individual
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Individual
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Filing date
Publication date
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Publication of EP0305811A2 publication Critical patent/EP0305811A2/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/48—Thread-feeding devices
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
    • D04B35/10—Indicating, warning, or safety devices, e.g. stop motions
    • D04B35/12—Indicating, warning, or safety devices, e.g. stop motions responsive to thread consumption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/40—Applications of tension indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H61/00—Applications of devices for metering predetermined lengths of running material
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2551/00—Means for control to be used by operator; User interfaces
    • B65H2551/20—Display means; Information output means
    • B65H2551/22—Numerical displays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the invention relates to a device for monitoring the yarn delivery in a yarn delivery device for textile machines, which in particular has a driven yarn delivery roller that promotes the yarn without slippage.
  • the measuring accuracy is also dependent on the type of yarn and to a certain extent dependent on the thread tension, with the measurement results showing considerable deviations from the actual values at low thread tensions.
  • measurement is hardly possible. In practice, however, such measuring devices are sufficiently precise for many measurements, particularly in the case of mechanical thread delivery devices.
  • a thread delivery device which has a thread delivery roller which is wrapped several times around the thread and which promotes slippage and which is driven by a small electric motor, the speed of which can be regulated by influencing the voltage or the characteristic of current pulses supplied by the motor .
  • an electrical control circuit is provided which has a thread tension sensor which senses the tension of the thread running from the thread supply roll and which emits an electrical signal which is characteristic of the actual value of the thread tension and which is compared with an adjustable thread tension setpoint which is given by an electrical setpoint tension .
  • control circuit can also be switched so that the output voltage of a speed sensor scanning the needle cylinder of the circular knitting machine is entered instead of the electrical setpoint voltage, the output voltage of which is compared with the correspondingly transformed output voltage of a tachometer generator which is coupled to the electric motor.
  • the output voltage of a speed sensor scanning the needle cylinder of the circular knitting machine is entered instead of the electrical setpoint voltage, the output voltage of which is compared with the correspondingly transformed output voltage of a tachometer generator which is coupled to the electric motor.
  • the one with the engine Coupled tachometer generator is designed as an incremental encoder, which emits a pulse train as the output signal, which is converted into an analog voltage by a frequency / voltage converter, it is possible to use the pulse output signal of the tachometer generator to determine the length or speed of the thread running from the thread delivery wheel to eat.
  • the object of the invention is now to provide a possibility for accurate continuous monitoring of the thread delivery in such an electronically controlled thread delivery device without additional effort and without affecting the function of the thread delivery device.
  • the device mentioned at the outset is characterized according to the invention in that it has a step frequency or a frequency derived therefrom of a drive motor of the thread delivery roller embodied as a stepper motor and / or output signals or signals derived therefrom of a rotationally movable element which is coupled with the thread without contact and non-contact scanning sensor processing first measuring circuit and / or has a second measuring circuit which measures the set thread tension setpoint of a setpoint generator of a control circuit associated with the thread delivery device, that the first measuring circuit for the step pulse number and / or for the incremental rotary movement of the rotatable element characterizing pulse frequency signals and the second measuring circuit for the respective thread tension target value emitting pulse frequency signals, and that emit pulse frequency signals are provided which are calibrated directly in units of the thread length and / or the thread running speed or thread tension and to which the signals of the first and the second measuring circuit are supplied.
  • the new monitoring device Since signals or output signals from the sensor are processed in any case to monitor the thread delivery in the electronic control circuit of the stepping motor of the thread delivery device, the new monitoring device does not require any intervention in the thread delivery device itself. It allows permanent, exact monitoring of the thread delivery via its display means without this several different own devices would have to be used.
  • the rotatable element sensed by the sensor may e.g. the thread delivery roller itself or a signaling element coupled with the running thread without slippage.
  • the first measuring circuit has at least one pulse frequency counter, to which the pulse frequency signals are fed and to which a control circuit for the display means is connected downstream. Since, for example, the step frequency of the stepper motor that feeds the thread without slippage via the thread delivery roller is directly proportional to the thread delivery quantity per unit time or the rotating element is coupled with the thread without slip, the frequency counter gives an exact measurement of the thread quantity supplied per unit time.
  • the first measuring circuit has a frequency divider upstream of this pulse frequency counter.
  • This frequency divider is expediently an adjustable frequency divider to which a device for the optional setting of the divider ratio is assigned, with which various calibrations (for example in meters per minute or yards per minute) of the display means can be carried out in a simple manner.
  • the frequency divider can be assigned a display device for the divider ratio set in each case.
  • the arrangement can advantageously be made such that the frequency divider can only be adjusted to integer divider ratios and the display values of the display means are approximate values within a predetermined measurement error range.
  • this measuring error range can be made so narrow that the display accuracy of the measured values achievable with the respective integer division ratio is sufficient for practical needs.
  • the pulse frequency counter can also have a device for specifying a preferably adjustable gate time, which makes it possible, for example, to recalibrate the display means.
  • an optionally switchable test frequency source can be assigned to the pulse frequency counter.
  • the first measuring circuit can have switching means by means of which the pulse frequency counter can be optionally supplied with the counting pulse frequency or the output frequency of the frequency divider.
  • the device has an input for a comparison pulse frequency source formed, for example, by another thread delivery device of the machine, which can be connected to the switching means.
  • Comparison means are connected to this input of the comparison pulse frequency source, from whose output the display means can be controlled.
  • a comparison with the thread delivery conditions on other thread delivery devices of the same machine can thus take place directly on the display means of a thread delivery device.
  • the comparison means expediently contain a device for the quotient education. If the pulse frequency of the thread delivery device in question is equal to that of the thread delivery device compared with it, the frequency ratio is 1 and the display means show the display value 1.00. If the ratio of the two frequencies to be measured changes to each other, the display value changes accordingly.
  • Such a simple comparison measurement is of particular importance when setting or adjusting a knitting machine, in particular a circular knitting machine. At the same time, the operating conditions can be monitored while the machine is operating.
  • the first measuring circuit has a gate device which interacts with the pulse frequency counter and which specifies a gate time interval within which the pulse frequency counter is effective, and that the gate device is designed to be controllable by external pulses.
  • the gate device can advantageously be connected to the signal output of an optoelectronic signal transmitter, which can be controlled by markings on parts of the machine which are movable relative to it, for example on its needle cylinder. In practice, this can be done in such a way that the markings, for example in the form of a strip having light-reflecting markings, are glued to the movable part, for example the needle cylinder of the circular knitting machine.
  • the gate device can optionally be switched on by assigned switching means in order to make the device switchable in accordance with the respective measuring process.
  • the gate device can also have signaling means indicating its respective operating state, which at least indicate the start and the end of the measurement and thus significantly simplify the handling of the device.
  • the arrangement can advantageously be such that the second measuring circuit is one of the excitation current or the Input excitation voltage of the torque generator has the signal-deriving signal processing switching stage that characterizes the thread tension. It is expedient if the second measuring circuit has a function generator which at least approximates the transfer function of the torque transmitter and of the function generator which at least approximates between the scanning point of the thread and the input of the torque transmitter or a constant current source feeding the latter.
  • the monitoring device for the yarn delivery can also be structurally integrated into the yarn delivery device itself, such that the measuring circuits and display means are accommodated directly in a housing part, etc. of the yarn delivery device.
  • the monitoring device is designed in the form of its own portable or mountable unit, which has at least connection devices for at least one connecting line to the electrical circuit of a stepping motor or a sensor or to the control circuit for keeping the thread tension constant having.
  • This unit can also have the switching means for the input of the comparison pulse frequency source, the switching means for the gate device and, if appropriate, switching means for a signal input to the frequency divider, the switching or Switching means are locked against each other so that incorrect operation and thus incorrect measurements are excluded.
  • the optoelectronic signal transmitter is integrated in the structural unit, but the sensor mentioned at the outset, which can advantageously have a light pen, can also be connected to the respective signal input via a line connection.
  • a light pen can then be inserted into a corresponding recess or holder of the associated thread delivery device and there, for example, an incremental one that is glued or otherwise attached to the thread delivery roller or a part rotating therewith Scan the sounder.
  • the device for monitoring the thread delivery shown in its details in FIGS. 1 to 4 is intended for use with a thread delivery device, the basic structure of which is illustrated in FIGS. 5, 6.
  • This thread delivery device has a housing 1, which carries a holder 2, which is set up for attachment to the frame ring of a circular knitting machine, not shown, and in the area of which electrical connection devices for the electrical and electronic components accommodated inside the housing 1 are also not shown are.
  • an electric stepping motor 3 is arranged in the upper part of the housing 1, which projects with its shaft through a corresponding opening in the front wall of the housing and drives a thread wheel 4 which is non-rotatably mounted on the shaft.
  • the thread wheel 4 consists of a hub 5 placed on the shaft and a number of essentially U-shaped wire brackets 6 connected to the end of the hub 5, each of which has an essentially axially parallel thread support part 7 and an adjoining run-in slope 8.
  • Thread eyelets 14, 15 exist.
  • the thread 16 coming from a thread source (not shown further), for example a bobbin, runs through the inlet eyelet 10 via an adjustable thread plate brake 17 arranged on the holder 9 and the deflection hook 13 onto the thread wheel 4 in the region of the bevels 8 of the wire bracket 6 push the thread turns that form onto the thread support parts 7 of the wire bracket 6, on which a storage roll consisting of a number of thread turns is thus formed, which together with the narrow support areas 7 ensures an essentially slip-free entrainment of the thread 16 on the circumference of the thread wheel 4.
  • a thread source for example a bobbin
  • the thread 16 runs through the first stationary outlet-side thread eyelet 14, from there through a thread eyelet 18 at the end of a thread guide arm 20 pivotally mounted on the housing 1 at the other end at 19 and from there back to the thread guide arm 20 second fixed thread eyelet 15, which is arranged slightly below, but laterally in the immediate vicinity of the first thread eyelet 14.
  • the thread goes from the second thread eyelet 15 to a thread consumer (not shown further), in the case of a knitting machine, to the needles of a knitting point.
  • the pivotably mounted thread guide arm 20 forms with its thread eyelet 18 between fixed thread eyelets 14, 15 an essentially V-shaped, elongated thread travel path, which represents a thread reserve, the size of which depends on the angular position of the thread guide arm 20.
  • a small DC motor 22 (FIG. 6) is attached to the front wall of the housing, which projects with its shaft through a corresponding opening in the front wall of the housing and carries a substantially L-shaped actuating lever 23, which is attached in a rotationally fixed manner and which is located on its one End supported on one side against the thread guide arm 20 and thus, in relation to FIG. 1, attempts to pivot it counterclockwise.
  • the permanently excited DC motor 22 which is preferably designed as a so-called bell-rotor motor, acts as a torque transmitter and can also be replaced by a torque transmitter constructed similarly to the measuring mechanism of a moving-coil measuring instrument, etc. It forms an electromagnetic setpoint transmitter for the thread tension, which exerts a precisely predetermined, adjustable setpoint force on the thread guide arm 20 and its eyelet 18 via the actuating arm 23. This setpoint force is opposite to the pulling force exerted by the thread guided through the eyelet 18 and dependent on the thread tension, i.e. 1, the setpoint force points to the left.
  • an electro-optical signal transmitter 24 is coupled, which scans the angular position of the thread guide arm 20 and emits an electrical signal which characterizes this and thus also the size of the thread reserve mentioned above.
  • the signal generator 24 consists of a light-emitting diode 25 and a phototransistor 26 lying in the beam path of the light-emitting diode 25, both of which are seated on a holder 27 fixed to the housing.
  • the light barrier more or less protrudes with its edge a non-rotatable anti-glare disc 28 placed on the axis 19 of the thread guide arm 20, the edge of which follows an appropriate function, preferably an e-function.
  • an analog electrical signal appears at the output of the phototransistor 26, which has a fixed functional dependency on the angular position of the thread guide arm 20 given by the outline of the shield 28.
  • the pivoting movement of the thread guide arm 20 is limited in both directions of rotation by two stop pins 29, 30. If there is no thread removal, the thread guide arm 20 is located in the vicinity of the left stop pin 29; it moves with increasing thread speed, i.e. increasing speed of the thread wheel 4 to the right towards the other stop pin 30 without being able to reach it in normal operation. The thread guide arm 20 only comes into contact with the stop pin 29 or 30 in the event of a fault.
  • FIG. 6 The basic structure of the electrical circuit for the stepping motor 3 driving the thread wheel 4 and the direct current motor 22 serving as setpoint generator is illustrated in FIG. 6:
  • the analog signal emitted by the photo transistor 26 of the signal generator 24, which is characteristic of the angular position of the thread guide arm 20, is fed via a low-pass filter 30 and a voltage follower 31 into a control circuit 32, which processes the signal Tet and the output side generates a frequency signal of a certain pulse repetition frequency, which is indicated at 33 and is fed to control electronics 34, which supplies the control motor 3 with an actuating signal in the form of a corresponding step pulse sequence via a downstream power output stage 35.
  • the low-pass filter 30 filters out higher-frequency interference signals from the analog signal coming from the signal generator 24; the voltage follower 31 supplies on the output side with a relatively low output impedance a signal voltage potential which is dependent on the respective angular position of the thread guide arm 20.
  • This voltage potential is due to a circuit arrangement of the circuit part 32 consisting essentially of two integrators 36, 37, which has a time constant matched to the respective starting or stopping characteristics of the stepping motor 3 and thus the temporal change in the frequency of the frequency signal 33 during start-up or of the outlet of the stepping motor 3 is limited in such a way that the stepping motor 3 loaded by the thread 16 and the thread wheel 4 etc. can follow the frequency change.
  • the thread consumer can cover his thread requirement from the thread reserve, the thread tension always being kept at its target value by the setpoint torque of the direct current motor 22 which is independent of the setting angle.
  • the stepper motor 3 can accelerate the thread wheel 4 to the speed corresponding to the required thread running speed within a time, the length of which is determined by the start-up characteristic and which ensures that the stepper motor 3 remains in step with the frequency signal 33.
  • the integrator 36 limits the speed of the frequency change when the stepping motor 3 starts up, while the integrator 37 limits the speed of the frequency change to a value which is below the stopping characteristic of the stepping motor 3, so that it stops exactly the frequency change of the frequency signal 33 until it stops follows.
  • the circuit arrangement formed by the integrators 36, 37 is followed by a diode path 38, the output of which is connected via a low-pass filter 39 to a voltage / frequency converter 40 which supplies the frequency signal 33.
  • the diode path 38 forms a threshold circuit which prevents the voltage / frequency converter 40 from being supplied with signal voltages below a lower threshold value, which would have the result that a frequency signal with an impermissibly low frequency for the stepper motor 3 is temporarily output.
  • the low-pass filter 39 prevents faults in the voltage / frequency converter 40, which is designed on the output side with a zero point suppression and which has a characteristic curve that can be changed in steepness, in order to appropriately adjust the angular position of the thread guide arm 20 and thus the size of the thread reserve for a specific stationary thread running speed can.
  • the analog voltage signal output by the voltage follower 31 is also fed via a potentiometer 41 to a differentiator 42, where it is differentiated.
  • the output of the differentiator 42 is connected via an adder 43 and a voltage follower 44 to a second potentiometer 45, which it allows to set the size of the torque exerted by the DC motor 22 and thus the target value of the thread tension.
  • the control input of a constant current source 46 is connected to the potentiometer 45 and excites the direct current motor 22 with constant current via a power output stage 47.
  • the thread guide arm 20 When a control deviation occurs, for example decreasing thread consumption, the thread guide arm 20 begins to migrate out of its desired angular position, so that the analog voltage signal supplied to the circuit part 32 experiences a corresponding change.
  • the corresponding pulse control signal 33 of the stepping motor 3 generated in the circuit part 32 is changed accordingly in the sense that the stepping motor 3 changes its speed and thus also the thread delivery speed until a steady state is reached again, in which the thread guide arm 20 is a assumes a fixed angular position in which the thread tension is in equilibrium with the setpoint force exerted by the actuating arm 23.
  • an external control signal can be sent from an external signal source, for example a central control device for all or for a certain number of thread delivery devices of a circular knitting machine, to the control input of the constant current source 46 via the potentiometer 45, which means that the torque can be adjusted remotely of the DC motor 22 and thus the thread tension allowed.
  • an external signal source for example a central control device for all or for a certain number of thread delivery devices of a circular knitting machine
  • an electronic monitoring device is provided, the details of which are shown in FIGS. 1 to 4 are illustrated and which are designed as a portable or mountable separate unit and are accommodated in a housing 50 shown in FIGS. 1, 2 in the front or rear view.
  • a housing 50 shown in FIGS. 1, 2 in the front or rear view.
  • connection devices in the form of two measuring sockets 51, 52 which form the signal input and are connected via pluggable connecting lines to two corresponding measuring sockets 53, 54 of the electronic control circuit of the thread delivery device shown in FIG. 6.
  • the measuring socket 53 is connected to the input of the stepping motor 3 and therefore supplies a pulse signal which characterizes the stepping frequency of the stepping motor 3 and which is fed to the measuring socket 51 of the monitoring device, while the other measuring socket 54 via the constant current source 46 and the power output stage 47 to the input of the DC motor 22 is connected and one for each one provided constant exciter direct current characteristic signal of the measuring socket 52 supplies the monitoring device.
  • the measuring socket 53 could also be arranged directly at the output of the circuit part 32 so that it transmits the pulse signal 33, which is also characteristic of the step frequency of the stepping motor 3.
  • a first measuring circuit 55 (FIG. 3) and a second measuring circuit 56 (FIG. 4) are arranged on corresponding boards, the input of which is connected to the first and second measuring sockets 51 and 52, and of which the first measuring circuit 55 for monitoring the amount of thread supplied or the thread running speed and the second measuring circuit 56 for monitoring the thread tension.
  • the first measuring circuit 55 contains a pulse frequency counter 57, an input 58 of which can optionally be connected directly via a changeover switch 59 to the measuring socket 51 or a frequency divider 60, which in turn is connected to the measuring socket 51.
  • the frequency divider 60 is an adjustable frequency divider that can only be set to integer divider ratios.
  • a coding switch 61 which has a digital display device 62 for the respectively set division ratio, is used for this setting. In the position shown "a" of the switch 59, the frequency divider 60 is between the measuring socket 51 and the pulse frequency counter 57.
  • the input 58 of the pulse frequency counter 57 is connected directly to the measuring socket 51, while a second Input 63 of the pulse frequency counter 57 is connected to a further measuring socket 64, which is used to connect a comparison Pulse frequency source is used, which is formed, for example, by a further thread delivery device of the circular knitting machine, with the measurement socket 53 of which the measurement socket 64 is connected via a corresponding connecting cable, so that it receives a step frequency pulse signal from the stepper motor 3 of this further thread delivery device.
  • the pulse frequency counter 57 is connected via control electronics 65 to a digital LCD or LED display device 66, which can be read from the front of the housing 50 in the manner shown in FIG. 1.
  • a test frequency source is integrated in the pulse frequency counter 57 and is switched on by a changeover switch 67 in the switch position shown in FIG. 3, so that the display device 66 displays the number 10,000,000 (corresponding to 10 MHz). In the other position of the switch 67, the test frequency source is switched off and the pulse frequency counter 57 processes the step frequency signals fed to it via its inputs 58, 63.
  • the power supply to the measuring circuits 55, 56 takes place from a direct current source shown at 68 via a device switch 69 which can be actuated from the outside of the housing (FIG. 2), the switch-on state being monitored by a control lamp 70.
  • the first measuring circuit 55 works as follows:
  • the thread 16 is conveyed via the thread wheel 4 by the stepping motor 3 essentially without slippage, which means that the amount of thread actually conveyed per unit of time is directly proportional to the number of steps per second of the stepping motor, i.e. whose cadence is
  • the delivery rate per unit of time can be determined with a simple but accurate step frequency count.
  • a pulse count can be used to directly determine the amount of thread consumed during a predetermined longer operating time (for example during the incorporation of a strip).
  • the cadence of the stepping motor 3 can be displayed directly on the display device 66, but this is only possible for special purposes.
  • the display device 66 is calibrated in such a way that it immediately displays the thread quantity delivered per unit of time, ie the thread running speed in meters per minute.
  • the frequency divider 60 and the associated calibration switch 61 are provided in order to enable this direct display of the thread quantity delivered per unit of time in a customary unit (for example meters per minute or yards per minute).
  • the frequency divider 60 is set by the calibration switch 61 to an integer divider ratio, which gives an approximate approximate value of the actual display value lying within a predetermined measurement error range.
  • the frequency divider 60 would have to be set to achieve an exact display value Since a division with a non-integer would require a considerable amount of electronic circuitry, the frequency divider 60 is actually set to the division ratio 17 by means of the coding switch 61, ie a measurement error is deliberately accepted, which results from the fact that instead of a yarn delivery quantity of 300 m / min in the specified embodiment. only are displayed.
  • the resulting measurement error is of the order of 2%.
  • the diameter of the thread wheel 4 can also be selected such that a measurement error of zero or of any negligibly small size results in the selected integer division ratio (in the present exemplary embodiment: if, for example, the thread wheel 4 delivers 0.1962 m of thread per revolution) .
  • the setting tion can be controlled by the display device 62.
  • the step frequencies fed via the inputs 58, 63 to the pulse frequency counter 57 are compared with one another in the pulse frequency counter 57 by forming the quotient. If both frequency values are the same, the display device 66 displays the value 1.00. If the ratio of the two measured frequencies to one another changes, the display value also experiences a corresponding change.
  • This ratio measurement is of particular importance when setting or adjusting, in particular of multi-system circular knitting machines.
  • simple comparative measurements can be carried out between a first adjusted and correct thread entry point (knitting system) and each thread entry point still to be adjusted or checked (knitting system). Continuous monitoring too is possible.
  • the second measuring circuit 56 shown in FIG. 4 simultaneously provides a display value for the thread tension of the running thread, the value of which is displayed on an LCD display device 71 (FIGS. 1, 4), in whose place an analog instrument could also be used.
  • the display device 71 is directly calibrated in units of the thread tension, for example in grams or in mN.
  • the measurement of the thread tension assumes that the direct current exciting the direct current motor 22 is proportional to the torque exerted on the actuating arm 23 and therefore represents a measure for the set thread tension setpoint.
  • this excitation current is not easy to measure because it has a relatively small size and, in addition, a clocked current supply with a clock frequency of approximately 25 kHz is provided by the constant current source 46 via the power output stage 47.
  • the input voltage of the constant current source 46 acting as a voltage / current converter 46 which is proportional to the constant current output, is fed to the second measuring circuit 56 via the measuring sockets 54, 52.
  • This voltage is applied to the inverting input of the IC 72 of a phase inversion stage 73, the output of which is connected via a resistor 74 and a transistor T1 to an IC 75, which is part of a function generator stage 76, the output 77 of which has the display device 71 via appropriate control electronics is controlled, which is calibrated for example in the range of 0 to 10g.
  • the function generation stage 76 is necessary because there is a linear relationship between the control voltage of the constant current source 46 and the excitation current of the DC motor 22, but the functional dependency between this control voltage and the thread pulling force 18 acting on the thread eyelet 18 arranged at the end of the thread guide arm 20 and thus the thread tension Thread tension is non-linear. Among other things, this affects from the fact that the frictional force between the thread and the eyelet 18 of the thread guide arm 20 is dependent on the thread tension and that non-linearities can also be introduced into the resulting transfer function by the DC motor 22.
  • the function generator stage 76 has a transmission characteristic which essentially corresponds to a section from a trigonometric function, which can also be approximately represented by an e-function.
  • Potentiometers 79, 80 allow the function generator stage 76 or the display device 71 to be influenced in the sense of the introduction of correction factors, e.g. to compensate for deviations from the set basic values when using yarns with very different friction values or due to changes in the thread travel etc.
  • the second measuring circuit 56 is powered at 78 from the current source 68 (FIG. 3). Otherwise, the pulse frequency counter 57 of the first measuring circuit 55 can also have an adjustable gate time, which permits a recalibration of the display device 66 or a length measurement of the thread delivered within a certain time.
  • FIG. 7,8 shows a modified embodiment of the new device, which is characterized by additional functions and possible uses.
  • This embodiment not only makes it possible to measure and display the amount of thread delivered per unit of time or the step frequency of the stepping motor 3 of the thread delivery device, but also to measure the amount of thread supplied, for example per machine revolution in a circular knitting machine, the same still being carried out using the first embodiment according to FIGS. 1 to 6, the possibility of comparative measurements is retained.
  • FIG. 7 Only a plan view of the housing 50 of the device is illustrated in FIG. 7. It is dimensioned in its elongated, rectangular shape so that it can be comfortably held in one hand, so that measurements can be carried out directly on the machine with this handheld device in a simple manner.
  • the device By pressing one of the buttons 81, 82, 83, which are electrically locked against each other, the device can be set to the respective measuring function:
  • the key 82 activates the device for measuring a thread quantity per unit of time, for example in m / min or in inch / sec, depending on the connection of the device, the measurement either indirectly via the step frequency of a stepper motor driving the thread delivery roller of the respective thread delivery device or via the output variable of a rotating element which senses a rotating element coupled with the thread or directly via a sensor with the running signal slip-free coupled signal wheel can be done.
  • the thread quantity delivered within a predetermined period of time for example one machine revolution, can be measured.
  • the device is switched to a thread quantity comparison measurement which allows, for example, the thread quantities delivered to two knitting systems of a circular knitting machine to be compared directly with one another.
  • the measurement can also take place indirectly or directly when the keys 82, 83 are actuated.
  • the first measuring circuit 55 is basically constructed in the manner shown in FIG. 8; the second measuring circuit for measuring the thread tension is the same as for the previously described embodiment and therefore not shown again in FIG. 8.
  • the pulse frequency counter is again designated 57. It controls the digital LCD or LED display device 66, which can be read from the front of the housing 50, via the control electronics 65.
  • the purpose of the frequency divider 60 connected upstream of the pulse frequency counter 57 has already been explained, which also applies in the same way to the assigned calibration switch 61 with display 62 and the changeover switch 67 for the integrated test frequency source of the pulse frequency counter 57.
  • the first input 58 of the pulse frequency counter 57 is connected to the output of an OR gate 84, while the measuring socket 64 serving to connect a comparison pulse frequency source is in turn connected directly to the second input 63 of the pulse frequency counter 57.
  • the two inputs of the OR gate 84 are connected to the outputs of two AND gates 85, 86, of which the AND gate 85 is connected on the input side to the frequency divider 60 and the key 82, which allows it to be actuated, to the second input of the AND gate 85 to set a positive potential of, for example, 5 volts.
  • the input of the frequency divider 60 is connected to the measuring socket 51 and an input of the second AND gate 86.
  • the button 81 is connected to a second input of the AND gate 86, which allows a positive potential of, for example, 5 volts to be applied to this input; a third input of the AND gate 86 is connected to the diode 87 third button 83 in connection, so that when the third button 83 is actuated, a positive potential of, for example, 5 volts can be applied to this third input.
  • a diode 88 in the same forward direction is connected in parallel with the diode 87.
  • the AND gate 86 there is a gate circuit which, when the key 81 is actuated, allows the pulse frequency counter 57 to be activated only during a gate period specified by the gate circuit, in such a way that only during this by external gate pulses Limited gate time period of the first measuring circuit supplied pulse signals are counted.
  • This gate circuit has two bistable D flip-flops 89, 90, whose two inputs with CK, D and whose two outputs with Q and Q are labeled, while the reset input is labeled R.
  • the set input S is grounded.
  • the two flip-flops 89, 90 are connected such that the Q -Output of the flip-flop 89 is connected to the clock input CK of the second flip-flop 90 and the D-input of the first flip-flop 89, while at the Q output of each of the two flip-flops 89, 90 there is a light emitting diode 91 and 92, which is common to one to the Q - Output of the second flip-flop 90 connected third light-emitting diode 93 from the front of the device housing 50 (Fig. 7) is visible.
  • the three LEDs 91 to 93 are on their other side through a resistor 9 4 to ground.
  • the output of an AND gate 95 is connected to the CK input of the first flip-flop 89, the first input of which is connected to (the light-emitting diode 93 and) the D input and the Q - Output of the second flip-flop 90 is connected.
  • An optoelectronic sensor in the form of a reflector light barrier 97 is connected to the first input of the AND gate 95 via an automatic signal level correction and trigger signal shaping stage 96.
  • the reflector light barrier 97 contains an IR transmitter diode and a photo receiver diode, which are arranged spatially in relation to one another in such a way that with the aid of a simple light reflector 98 (mirror, metal surface, light-colored adhesive strip, etc.), which is at a distance of approx up to 40 mm, at the output of the reflector light barrier 97 a signal level change sufficient for triggering the subsequent signal form stage 96 is achieved.
  • the associated automatic level correction stage effects an automatic adaptation to the light conditions of the measuring point, so that the necessary step or delta sensitivity is maintained even in the case of relatively strong (constant) extraneous light.
  • the automatic level correction and trigger waveform stage 96 contains a differentiating element, via which the respective trigger pulse arrives at the first input of the AND element 95.
  • the two reset inputs R of the two flip-flops 89, 90 are connected to the key 81 via an ohmic voltage divider with the resistors 100, 101 and a capacitor 99 parallel to the resistor 100.
  • the circular knitting machine is equipped with electronic thread delivery devices, as shown in FIGS. 5, 6.
  • the measuring socket 51 is connected via a corresponding connecting line to the measuring socket 53 of the electronic control circuit of the thread delivery device according to FIG. 6, so that a pulse signal characterizing the step frequency of the stepping motor 3 is supplied via the measuring socket 51.
  • the key 81 labeled "mm / U” or "inch / rev” was pressed.
  • a light-reflecting strip with a label is glued to the cylinder of the circular knitting machine; the device housing 50 is in one Distance of 10 to 40 mm from this light-reflecting strip, which forms the reflector 98, kept.
  • the light-emitting diode 93 with the designation “set” is thus activated, while the other two light-emitting diodes 91, 92 with the designation “count” or “block” are not activated.
  • the second input of the AND gate 95 is at an "H" level.
  • the AND gate 85 is blocked because its second input is at "L” level because of the key 82 not being actuated. Positive step pulses of the stepping motor 3 are fed to the first input of the other AND gate 86 via the measuring socket 51, while the second input of this AND gate 86 is held at "H" level by the actuated key 81. Because of the diode 88, the third input of the AND gate 86 is initially at "L” level. The AND gate 86 is thus blocked, so that the step pulses arriving via the measuring socket 51 do not reach the pulse frequency counter 57 and can be counted there. The pulse frequency counter 57 is therefore ineffective.
  • the third input of the AND gate 86 also comes to "H" level, so that the step or general counting pulses supplied via the measuring socket 51 are switched through to the second input of the OR gate 84, which in turn sends these counting pulses to the forwards the first input 58 of the pulse frequency counter 57.
  • the pulse frequency counter 57 is thus effective; he now counts the counting pulses supplied to him.
  • a next trigger pulse triggered by a further reflection at a corresponding brand of the reflector 98 of the reflector light barrier 97 sets the Q output of the first flip-flop 89 back to "L” level while its Q - Output comes to "H” level.
  • the second flip-flop 90 switches so that its Q output comes to "H” level while its Q -Output goes to L level.
  • the third light-emitting diode 92 with the designation "lock” is activated, while the two previously light-emitting diodes 91, 93 ("count” and “set") go out.
  • the AND gate 95 is because of the "L” level of the Q - Output of the second flip-flop 90 blocked for further trigger pulses. Since the Q output of the first flip-flop 89 has gone to "L” level, the AND gate 86 is also blocked, with the result that no further step or count pulses can reach the pulse frequency counter 57 from the measuring socket 51 .
  • the pulse counting process is thus completed and the display unit 66 immediately shows the between two successive trigger pulses, i.e. For example, the amount of thread delivered during a machine revolution in mm / u or inch / rev.
  • the measuring process is particularly simple and user-friendly. After the circular knitting machine has been switched on and the device housing 50 has been arranged at a distance of 10 to 40 mm from the light-reflecting measurement mark on the needle cylinder, only the key 81 is required to be pressed, with which the LED 93 "set” lights up and indicates that the device is ready for measurement. As soon as the mark passes the measuring device, the second LED 91 "count” lights up, which indicates the start of the measurement. After exactly one revolution of the machine or when passing the measuring mark a second time, the third light-emitting diode 92 lights up "lock", while the other two light-emitting diodes 91, 93 go out, which indicates the end of the measuring process.
  • the key 82 is pressed. This brings the second input of the AND gate 85 to "H" level.
  • the step pulses of the stepping motor 3 supplied via the measuring socket 51 are fed to the input of the frequency divider 60, the positive output pulses of which pass through the AND gate 85 and the permeable OR gate 84 to the pulse frequency counter 57 and are counted there.
  • the pulse frequency counter 57 has a quartz-controlled oscillator, indicated at 103, with integrated divider stages for the correct setting of the preselectable times of the pulse frequency counter 57. In the present case, this gate time is set to 1 sec.
  • the display device 66 immediately shows the thread running speed, for example in m / min, as has already been explained earlier.
  • the AND gate 86 is blocked because its second and third inputs are continuously open "L" levels are maintained.
  • the key 83 is pressed.
  • the step or count pulses of the two yarn delivery devices to be compared with one another are supplied via the two measuring sockets 51, 64, of which the second measuring socket 64 is connected directly to the second counting input 63 of the pulse frequency counter 57.
  • the AND gate 85 is blocked because its second input is at "L" level because of the key 82 not being actuated.
  • the positive counting pulses supplied via the measuring socket 51 reach the first counting input 58 of the pulse frequency counter 57 via the permeable AND gate 86 and the connected OR gate 84.
  • the AND gate 86 is therefore permeable because its second and third inputs are via the diodes 88, 87 and the key 83 have "H" potential.
  • the frequency comparison between the two pulse frequency signals supplied via the measuring sockets 51, 64 is carried out by forming quotients in the pulse frequency counter 57, as has already been explained with reference to the first embodiment.
  • the pulse frequency counter 57 is designed with a switchover facility for event counting, frequency measurement and frequency ratio measurement.
  • the respective operating mode is activated automatically by an electronic changeover switch 104 when one of the Keys 81, 82, 83 actuated, for which its input 105, "event counting”, with the output of key 81, its input 106, “frequency measurement”, with the output of key 82 and finally its input 107, "frequency ratio measurement” with which Output of the button 83 is connected.
  • the measuring device can also be used universally insofar as its first measuring circuit described can also process pulse frequency signals coming from its own sensor or transducer which scans the running thread directly or indirectly.
  • FIG. 9 An example of such a sensor, which measures the running thread directly, is shown in FIG. 9:
  • the running thread 16 is wrapped around a rotatably mounted encoder wheel 110 and thus coupled to it without slipping.
  • the encoder wheel is rigidly coupled to a measuring disk 111, which is designed, for example, in the form of a sector disk, the light / dark areas of which are scanned by a fork light barrier 112.
  • the output signals emitted by the forked light barrier 112 are fed to a signal processing stage 113, which in turn feeds the processed signals to a pulse shaper and frequency doubler stage 114, from which the counting pulses of the measuring bushing 51 or 64 of the first measuring circuit, which characterize the incremental rotary movement of the measuring disk 112, for example. 8, are fed.
  • the encoder wheel 110 can also be another rotatably mounted element on the thread path, which element is coupled to the thread 16 without slippage, for example the thread delivery roller of a mechanical thread delivery device.
  • the measuring disk 111 which is in the form of a self-adhesive film, to the thread delivery roller or a circumferential element rigidly coupled to it, and thus to carry out an incremental measurement of the rotational movement and thus of the thread running speed.
  • a so-called opto-electronic pen or light pen 115 can also be used, which in principle consists of a reflector light barrier, similar to the reflector light barrier 97, and supplies suitable input frequency signals for the first measuring circuit via downstream signal processing and pulse shaping stages. If such an optoelectronic pen is used, the arrangement can also be made such that, for example, a suitable receiving opening for this optoelectronic pen is worked into the holder or the housing of the thread delivery device, into which the pen is inserted, which is then inserted optically scans the measuring disk 111 with its markings applied at uniform angular intervals.
  • the reflector light barrier 97 of the first measuring circuit can also be separate from the housing 50 or can be designed to be removable from it, in which case plug connections indicated in FIG. 8 and, if appropriate, suitable connecting cables are provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
EP88113377A 1987-09-02 1988-08-18 Vorrichtung zur Überwachung der Fadenliefervorrichtung für Textilmaschinen Withdrawn EP0305811A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3729297A DE3729297C1 (de) 1987-09-02 1987-09-02 Vorrichtung zur UEberwachung der Fadenlieferung bei einer Fadenliefervorrichtung fuer Textilmaschinen
DE3729297 1987-09-02

Publications (1)

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EP0305811A2 true EP0305811A2 (de) 1989-03-08

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EP88113377A Withdrawn EP0305811A2 (de) 1987-09-02 1988-08-18 Vorrichtung zur Überwachung der Fadenliefervorrichtung für Textilmaschinen

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EP (1) EP0305811A2 (cs)
JP (1) JPH0192459A (cs)
KR (1) KR890005325A (cs)
CN (1) CN1033080A (cs)
CS (1) CS590388A2 (cs)
DD (1) DD282252A5 (cs)
DE (1) DE3729297C1 (cs)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2669045A1 (fr) * 1990-11-14 1992-05-15 Fatel Telematique Procede et systeme de controle du fonctionnement d'une machine textile.
DE4213842A1 (de) * 1992-04-28 1993-11-04 Inst Textil & Faserforschung Verfahren und einrichtung zur ueberwachung der funktion der nadeln einer textilmaschine
EP0568762A1 (en) * 1992-03-17 1993-11-10 Angelo Paggiaro Electronic feeder apparatus for automatically controlling the tension of the yarn in a knitting machine and textile machines in general
BE1005824A3 (nl) * 1992-05-22 1994-02-08 Picanol Nv Werkwijze voor het bepalen van een spanning in een inslagdraad.
EP0619261A1 (en) * 1993-04-05 1994-10-12 B.T.S.R. International S.p.A. Method and device for monitoring and maintaining correct regulation of the tension of a yarn fed to a textile machine
EP0943713A3 (de) * 1998-03-14 2000-05-03 Memminger-IRO GmbH Fadenspannungssensor mit wiederholtem Abgleich
EP1284230A4 (en) * 2000-04-27 2004-03-24 Teijin Ltd FIBER PROCESSING CONTROL METHOD AND DEVICE
EP1473394A1 (en) * 2003-04-30 2004-11-03 Riccardo Lonati Device and method for adjusting the gram force applied to the thread, for feeding thread to a knitting machine with constant tension
EP1208483A4 (en) * 1999-04-06 2006-11-02 Laurence P Rubel SYSTEM FOR CONTROL AND DEFICIENCY FOR TEXTILE PROCESSING MACHINES
WO2007062740A1 (de) * 2005-12-01 2007-06-07 Memminger-Iro Gmbh Verfahren und einrichtung zur bestimmung der fadenmenge an einer strickmaschine
CN102581159A (zh) * 2012-03-01 2012-07-18 深圳市联星服装辅料有限公司 带动态信号输出无动力无声响送料器

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Publication number Priority date Publication date Assignee Title
KR20010028321A (ko) * 1999-09-20 2001-04-06 이경목 환편기의 송사휠 구동장치
DE10032705B4 (de) * 2000-07-05 2006-11-16 Memminger-Iro Gmbh Fadenliefereinrichtung für Textilmaschinen
DE102013110988B4 (de) * 2013-10-02 2019-08-29 Memminger-Iro Gmbh Verfahren und Vorrichtung zur Überwachung der Produktion einer Strickmaschine sowie Strickmaschine
CN104590953A (zh) * 2015-01-10 2015-05-06 安徽凯恩特科技有限公司 一种拉链检测装置
DE102015014385A1 (de) * 2015-11-09 2017-05-11 Saurer Germany Gmbh & Co. Kg Verfahren zum Korrigieren eines Fadenlaufs bei einer Arbeitsstelle einer Kreuzspulen herstellenden Textilmaschine

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Publication number Priority date Publication date Assignee Title
US3858416A (en) * 1973-07-23 1975-01-07 Eugene F White Knitting machine yarn feeding apparatus
DE3416195C2 (de) * 1984-05-02 1987-01-08 Gustav 7290 Freudenstadt Memminger Fadenliefervorrichtung für fadenverarbeitende Textilmaschinen, bspw. Rundstrick- oder -wirkmaschinen
DE3627731C1 (de) * 1986-08-16 1988-03-31 Gustav Memminger Fadenliefervorrichtung mit elektronischer Fadenspannungsregelung

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2669045A1 (fr) * 1990-11-14 1992-05-15 Fatel Telematique Procede et systeme de controle du fonctionnement d'une machine textile.
EP0568762A1 (en) * 1992-03-17 1993-11-10 Angelo Paggiaro Electronic feeder apparatus for automatically controlling the tension of the yarn in a knitting machine and textile machines in general
DE4213842A1 (de) * 1992-04-28 1993-11-04 Inst Textil & Faserforschung Verfahren und einrichtung zur ueberwachung der funktion der nadeln einer textilmaschine
BE1005824A3 (nl) * 1992-05-22 1994-02-08 Picanol Nv Werkwijze voor het bepalen van een spanning in een inslagdraad.
EP0570875A3 (de) * 1992-05-22 1995-01-11 Picanol Nv Verfahren zum Ermitteln einer Kenngrösse für den Betrieb einer Webmaschine und Webmaschine zum Durchführen des Verfahrens.
EP0619261A1 (en) * 1993-04-05 1994-10-12 B.T.S.R. International S.p.A. Method and device for monitoring and maintaining correct regulation of the tension of a yarn fed to a textile machine
US5566574A (en) * 1993-04-05 1996-10-22 International Trading S.R.L. Method and device for monitoring and maintaining correct regulation of the tension of a yarn fed to a textile machine
US6105895A (en) * 1998-03-14 2000-08-22 Memminger-Iro Gmbh Yarn tension sensor with improved calibration
EP0943713A3 (de) * 1998-03-14 2000-05-03 Memminger-IRO GmbH Fadenspannungssensor mit wiederholtem Abgleich
EP1208483A4 (en) * 1999-04-06 2006-11-02 Laurence P Rubel SYSTEM FOR CONTROL AND DEFICIENCY FOR TEXTILE PROCESSING MACHINES
EP1284230A4 (en) * 2000-04-27 2004-03-24 Teijin Ltd FIBER PROCESSING CONTROL METHOD AND DEVICE
US6745097B2 (en) 2000-04-27 2004-06-01 Teijin Limited Management method for fiber processing and a management apparatus thereof
EP1473394A1 (en) * 2003-04-30 2004-11-03 Riccardo Lonati Device and method for adjusting the gram force applied to the thread, for feeding thread to a knitting machine with constant tension
WO2007062740A1 (de) * 2005-12-01 2007-06-07 Memminger-Iro Gmbh Verfahren und einrichtung zur bestimmung der fadenmenge an einer strickmaschine
DE102005057352B3 (de) * 2005-12-01 2007-08-23 Memminger-Iro Gmbh Verfahren und Einrichtung zur Bestimmung der Fadenmenge an einer Strickmaschine
CN102581159A (zh) * 2012-03-01 2012-07-18 深圳市联星服装辅料有限公司 带动态信号输出无动力无声响送料器
CN102581159B (zh) * 2012-03-01 2013-11-27 深圳市联星服装辅料有限公司 带动态信号输出无动力无声响送料器

Also Published As

Publication number Publication date
CS590388A2 (en) 1989-12-13
JPH0192459A (ja) 1989-04-11
DD282252A5 (de) 1990-09-05
DE3729297C1 (de) 1989-03-02
KR890005325A (ko) 1989-05-13
CN1033080A (zh) 1989-05-24

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