EP0608001B1 - Ringspinnmaschine mit einem Fadenspannungssensor sowie Anwendung eines Fadenspannungssensors zur Steuerung einer Ringspinnmaschine - Google Patents
Ringspinnmaschine mit einem Fadenspannungssensor sowie Anwendung eines Fadenspannungssensors zur Steuerung einer Ringspinnmaschine Download PDFInfo
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- EP0608001B1 EP0608001B1 EP94102738A EP94102738A EP0608001B1 EP 0608001 B1 EP0608001 B1 EP 0608001B1 EP 94102738 A EP94102738 A EP 94102738A EP 94102738 A EP94102738 A EP 94102738A EP 0608001 B1 EP0608001 B1 EP 0608001B1
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- Prior art keywords
- thread
- thread tension
- sensor
- tension sensor
- spinning machine
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- 238000009987 spinning Methods 0.000 claims description 22
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Images
Classifications
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- 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
- B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
- B65H63/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
- B65H63/024—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
- B65H63/028—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element
- B65H63/032—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic
- B65H63/0321—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic using electronic actuators
- B65H63/0327—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic using electronic actuators using piezoelectric sensing means
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H13/00—Other common constructional features, details or accessories
- D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
- D01H13/16—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material
- D01H13/1616—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material characterised by the detector
- D01H13/1633—Electronic actuators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2513/00—Dynamic entities; Timing aspects
- B65H2513/10—Speed
- B65H2513/11—Speed angular
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
- B65H2515/30—Forces; Stresses
- B65H2515/31—Tensile forces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2553/00—Sensing or detecting means
- B65H2553/20—Sensing or detecting means using electric elements
- B65H2553/26—Piezoelectric sensors
-
- 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 present invention relates to a ring spinning machine a thread tension sensor, as well as the application of a Thread tension sensor for controlling a ring spinning machine.
- the DE OS 29 19 836 discloses a thread break sensor which consists of a piezoelectric element that is on one part the thread guide is attached and its output signal to Finding a thread break is processed further.
- a rectifier filter converts the AC signals to DC signals.
- a voltage comparator becomes a voltage range in which normal operation is guaranteed, and on The output of the comparator has a corresponding logic Output signal on (DE-OS 29 19 836, p. 10, lines 29 to p. 11, e.g. 6).
- the thread sensor from DE-OS 29 19 836 is only in the Able to determine thread breaks, but not the Measure thread tension.
- the ring speed faster starting of the spindles after a gradual Sequence program and secondly an overall higher operating speed of the spindles, because the in increased thread loads occurring in these operating conditions due to the reduced relative speed between Spindle and rotor can be reduced.
- the respective Thread loading is carried out by a thread tension sensor determined, with one for each yarn material certain, desired thread tension is selected, which should be observed during the entire spinning process.
- the measured thread tension deviates from the desired thread tension down, so the speed of the ring track becomes changes that the measured thread tension value adjusted to the desired thread tension value.
- Exceeds the measured thread tension value has an upper limit or if it falls below a lower limit, the Spindle speed correspondingly reduced or increased until the measured thread tension value again below the upper one or is above the lower limit. To achieve and then maintaining the desired thread tension again only the speed of the ring track controlled.
- From DE-A-37 18 924 is an automatic winder with several Known winding units, with which the spun on a spindle wound thread unwound from this spindle and on a package of a predetermined shape and one predetermined thread volume is wound up, in the thread existing defects are eliminated.
- the the spun Thread-bearing spindle is stationary in a spindle take-up point arranged so that a spindle drive, as a ring spinning machine has, does not exist is.
- the thread comes from the stationary spindle in the longitudinal direction withdrawn and led straight to the package.
- the present invention has for its object a to provide improved ring spinning machine.
- the invention is based on the knowledge belonging to the invention that the output signal of the sensor is a complex analog signal which also contains, among other things, the speed of the rotor as a fundamental vibration in the course of the deflection of the thread guide as well as harmonic values of this fundamental vibration and the so-called thread noise. in addition to other vibrations such as the natural vibrations of the thread guides and vibrations induced by machine vibrations. Furthermore, the invention is based on the inventive finding that both the level of the rotor speed and the level of harmonic frequencies of the rotor speed are a function of the thread tension, so that an evaluation of the thread tension either at the fundamental frequency (f 1 ) or at the harmonic frequencies ( f 2 to f 9 ) of the rotor speed is possible.
- the evaluation of the sensor signal can therefore go that a comparison of the level of thread tension is carried out with a reference level.
- This reference level can vary from machine parameters such as Depending on the spindle speed, maintenance condition etc.
- the result this comparison can then be used to control the corresponding Machine are used, namely for control the spindle speed of a ring spinning machine in the sense of Adherence to a predetermined thread tension or one predetermined course of the thread tension over the Coping process.
- Ring spinning machine is preferably the thread guide as Thread guide eyelet, for example in the form of the known Sauschwanzerls trained.
- the thread guide eyelet can its holder be fixed by means of a leaf spring, the sensor is to be attached to the leaf spring.
- the Leaf spring itself is said to be essentially level be arranged parallel to the thread movement. But it is also possible instead of a leaf spring part of the Thread guide or the thread guide eyelet itself as a spring form, the sensor or sensors then on this spring part is or are attached.
- the piezo sensors used in the prior art are piezo crystals that have a pronounced resonance have and thereby caused for the purpose of the invention are not sufficiently broadband.
- a particular embodiment of the present invention is characterized in that the piezo film is a so-called PVDF film is the most inexpensive to get and is extremely thin.
- These piezo foils are very broadband and the use of such a piezo film advantageously does not lead to falsification of the measured vibrations.
- one or more thread tension sensors can provide a non-thread-bearing reference sensor, which is a signal dependent on machine vibrations emits, the thread tension signals with the reference signal can be compared and a difference value is formed can be.
- the reference signal can also be used as a threshold for the generation of binary thread break information be used. But it is also possible to use the Reference sensor loud environmental noises such as ultrasound from Recognize compressed air etc. and generated in the same period Declare thread tension information.
- Fig. 2 shows a side view a spinning station 10 of a ring spinning machine, in which a thread 12 leaves the outlet rollers 14, 16 of the drafting system and through the thread guide eyelet 18 and an anti-balloon ring 20 to one rotating on the ring track 21 of the ring bench 23
- Ring traveler 22 leads, causing it to the rotating spindle sleeve 24 is wound up to a cop 26.
- Balloon trains through the anti-balloon or balloon containment ring 20 is limited and in the thread guide eyelet has its top.
- the friction and air resistance of the runner, the air resistance of the thread and the frictional resistance between thread and runner and between thread and balloon confinement ring generate a thread tension that is in place the thread guide is measurable.
- spindle speed range between about 6000 rpm and 20,000 rpm, with the thread tension sensor, as described here, without further ado for spindle speeds or runner numbers (which only by 1 or 2% are lower than the spindle speeds and thus this can be equated) up to 30,000 rpm and higher are.
- FIG. 1a and 1b This thread sensor is shown schematically in Figs. 1a and 1b.
- the thread guide eyelet 18 is so tapered in the rear part, that a bendable, resilient zone 30 with the shape of a Leaf spring is created.
- the leaf spring-like part 30 is on its end facing away from the thread guide eyelet into a clamping block 35 clamped and by means of this clamping block on Frame of the ring spinning machine on a longitudinal rod 37 of the ring spinning machine held.
- a strain sensitive Sensor element 32 On the flat right side 34 of the bendable resilient zone of the leaf spring is a strain sensitive Sensor element 32 attached, which preferably consists of a PVDF piezo film.
- connection cable 36 a strain-dependent electrical signal to a downstream electronics (Fig. 5).
- the thread 12 runs essentially in a straight line from the pair of delivery rollers 14, 16 to the thread guide 18 and is due to the developing Balloons deflected on the thread guide.
- the rotation of the Runner 22 causes the thread to make a circular movement runs inside the thread guide, causing the on alternate the forces applied to the left and the right side of it.
- This will make the leaf spring 30 also bent to the left and to the right (L and R in Fig. 1b), so that the piezo film also executes an alternating movement and generates an alternating voltage. This changing movement is important for them How the sensor works.
- Piezo film is arranged in a plane that the Includes the thread running direction before the thread guide, could Piezo film or the leaf spring, for example laterally to be arranged offset to the thread guide. This too Arrangement would for lateral deflection of the leaf spring lead to both sides.
- the thread guide eyelet is formed in one piece from shaped sheet metal as in FIGS. 7a, 7b and 7c.
- the one made of spring steel Guide eye is shaped so that it in the leaf spring part 32 originally straight or rectangular cross section (Fig. 7c) of the sheet metal strip at least essentially maintained.
- Fig. 7c the leaf spring part 32 originally straight or rectangular cross section of the sheet metal strip at least essentially maintained.
- Fig. 7b the Transition into the actual eyelet 18 changes this cross section in an arcuate cross-section (Fig. 7b), so that the narrowest passage of the eyelet through the curved middle Area 18 'of the strip is formed while the edge areas farther from the center of the eyelet.
- the sheet metal strip can in the leaf spring part be wider than in the eyelet as indicated at 34 '.
- curve 38 according to FIG. 3a essentially represents a type of sine wave 40 a superimposed high-frequency oscillation 42 of a complex type.
- the sine wave corresponds to the speed of the ring traveler 22 and the superimposed vibrations contain information over all other vibrations that the thread guide eyelet is exposed.
- FIG. 3b If one carries out a spectral analysis of the sensor signal according to FIG. 3a, one obtains a result, as shown in FIG. 3b.
- the basic vibration is assigned harmonic vibrations f 2 , f 3 , f 4 to f 9 and the so-called thread noise, which ranges from f 10 to f 11 .
- the thread noise is caused on the one hand by the fibrous surface of the thread, and on the other hand by the constantly fluctuating cross-section of the thread (thinning or thickening).
- Both the level of the speed f 1 and the level of their harmonics f 2 to f 9 are a function of the thread tension. This makes a comparison between FIGS. 3a and 3b on the one hand and FIGS. 4a and 4b on the other hand clear.
- Thread tension sensor ranges from less than 1 Hz to more than 1 MHz, has to Consequence that not only the thread tension of the sensor signal incoming, but also machine vibrations, the majority from the range of spindle or rotor speed, but also of high-frequency components from the area of thread noise come. If a thread runs through the thread guide eyelet, do not disturb these machine vibrations because they are too are weak. In the event of a thread break, these come Vibration signals but appear and deceive a very weak thread tension signal.
- a reference sensor is attached to the machine who works under exactly the same conditions as that Thread tension sensor, i.e. he will also be on a thread guide attached, but on one that does not lead a thread.
- the signal from this reference sensor is similar processed like the signals from the thread-guiding sensors. Out the signal from the reference sensor is now the upper one Reference level won.
- the reference sensor delivers the Reference level for one or more thread break sensors. This eliminates local conditions that affect the noise level determine, taken into account. It is preferred for groups with 20 to 60 active sensors, one reference sensor each.
- the signal present at terminal 52 the sensor is amplified with one or more amplifiers 54, with filter 56 of unwanted signal components exempt and then a rectifier / integrator 58 fed.
- the filter 56 can be a so-called moving Be a filter that controls a center frequency according to the respective rotor speed. This Center frequency can also be asymmetrical in the frequency pass band of the filter. A particularly preferred filter This type will be described later in connection with FIG. 8 described.
- the output signal of the rectifier / integrator 58, the on terminal 60 is present, then the circuit shown in FIG. 5b supplied as an input signal.
- the circuit according to FIG. 5a is identified overall by the reference number 62.
- 5b shows the signal present at terminal 60 by means of an analog / digital converter 64 into a digital signal converted by a subsequent microcontroller 66 is analyzed to gain the thread tension.
- the Terminal 70 allows a reference voltage to the Analog / digital converter to apply, this reference voltage is obtained from the reference sensor mentioned above and for the purpose of comparison with the signal present at terminal 60 also by a circuit corresponding to circuit 62 is being prepared.
- the one generated by the microcontroller Thread tension signal is present at terminal 68 and can Machine control fed and here in controlling the speed of rotation of the Spindle drive are taken into account.
- 5c shows an alternative embodiment of the evaluation of the signal present at terminal 60 by a comparator 72, which compares it in analog form with a reference voltage U Ref which is present at terminal 74 and, as mentioned above, from the reference sensor via a Circuit corresponding to the circuit 62 is obtained.
- the output signal of the comparator 72 is then further processed by a microcontroller 76 into a thread tension signal which can be tapped at the terminal 78.
- the thread tension signal can be displayed or evaluated in accordance with the thread tension signal present at terminal 68.
- the analog / digital conversion takes place in the microcontroller 76.
- a predetermined reference voltage U Ref can be used, which is either constant or whose level can be varied depending on machine operating states.
- The. Fig. 6 shows an alternative evaluation, in particular can be used if a reference sensor 80, is attached to the machine as explained above, i.e. when a reference sensor 80 is attached to a thread guide that does not have a thread.
- FIG. 6 first shows a series of input terminals 52, 52.1, 52.2 to 52.n, each of which is the signal of a thread guiding sensor 32.
- Each terminal 52 to 52.n leads to a respective circuit 62 according to FIG. 5a and Output terminals 60, 60.1 to 60.n of these circuits 62 applied to an electronic switch 81, which in the Is able to use the signals successively or in a particular Order or in a selected order to a continue circuit 82, this further Circuit 82 either according to Fig. 5b, or 5c can be formed.
- the clamp 52.r carries the voltage from the reference sensor 80, which also by means of a circuit 62 corresponding to FIG. 5a is amplified, filtered or integrated.
- Like the arrow 84 shows the output signal of the reference sensor 80 associated circuit 62 the reference voltage for the Further processing circuit according to FIG. 5b or FIG. 5c.
- the level of the reference sensor 80 becomes with the level of the thread guiding sensors 32, 32.1, 32.2 to 32.n compared. The difference is then considered pure Thread tension signal processed further, for example corresponding to Fig. 5b or 5c.
- the switch 62 is in Usually not designed as a mechanical switch, but as an electronic circuit, for example after a multiplexing process. 6 has an arrangement the advantage that only a complex evaluation circuit is required to receive signals from a variety of thread break sensors to further process thread tension signals.
- a ring spinning machine with several spinning positions, for example 1000 or 1200 spinning positions, becomes a piezo film sensor provided with each thread guide, so that a thread break signal from each of the total available spinning positions can be generated.
- the wiring made so that at certain spinning positions, for example every twentieth or fiftieth spinning position a possibility there is to measure the respective thread tension.
- the machine will then have one or two thread guides per side provided that do not lead a thread, but which just like the other thread guides trained and also with Piezo film sensors are equipped to the above mentioned Generate reference signals.
- FIG. 8 A particularly preferred version of a moving Filters is shown in FIG. 8. It is here a block diagram showing the application of a filter in the SC version (SC means "switched capacitor"), which is preferably in the form of a chip, namely the Chip MF / 10 from National Semiconductors.
- SC switching capacitor
- the spindles are one Main motor 100 driven, via a so-called vertical shaft 102 and belts (not shown), each four spindles drive. The exact design of this drive is in the state well known in the art, e.g. Rieter ring spinning machines G5 / 1.
- n is the ratio of the speed spindle to the speed main motor drive.
- This clock frequency is then on a two-phase clock generator 114, which is part of the SC filter 56.
- This two-phase clock generator two around the phases ⁇ 1 and ⁇ 2 generated shifted signals, which serve over the lines shown as an arrow, two To operate the switch.
- These switches serve one purpose Condenser with the negative terminal from time to time another capacitor 122 provided with an operational amplifier 120 to connect. The rate at which the switches closed and opened at the same time determines the effective impedance of the capacitance at the input of the opamp what again defines the center frequency of the bandpass filter. Center frequency of the filter leads.
- the amplified sensor signal coming from the amplifier 54 becomes therefore placed at the input of the filter, and the filtered signal the rectifier / integrator is then at the output of the filter 56 58 fed, according to the circuit 5a.
- the described type of thread tension measurement can be performed at all rotor frequencies that well above the fundamental vibration frequency of the thread guide, i.e. the natural vibration frequency of the thread guide eyelet Suspension system lies.
- This fundamental oscillation frequency is normally at about 10 to 20 Hz and the label "Significantly above” indicates frequencies that are at one Factor of about 4 to 10 or higher. So that can Thread tension measuring method according to the present invention Rotor speeds above 100 Hz, i.e. approx. 6000 rpm be used. Because such speeds are below those of interest Useful speeds of the spindles of the ring spinning machine this lower limit of the voltage evaluation in practice no restriction.
- An advantage of an SC-type filter is that the bandwidth of the pass band of the filter is proportional is changed to the center frequency in that the quality Q of the filter remains at least essentially constant, which the signal evaluation benefits.
- the sensor should be in the form of Piezo film in a plane containing the thread running direction or a plane parallel to this can be arranged such that the suspension of the thread guide to elastic movements both sides, based on the direction of the thread.
- the thread running direction means for example the direction of the thread between the Delivery roller pair and the thread guide or the middle Direction of the thread within the thread balloon, with the the geometric axis of the thread balloon.
- FIG. 9 shows a thread tension sensor which works differently than previously described.
- FIG. 9 schematically shows that the thread guide eyelet 18 is attached to a web 92 of a thread guide holder 94 via a first load cell 90. More specifically, the thread guide eyelet is attached to one end face of the load cell 90, while the other end face of the load cell is attached to the web 92. On the other side of the web 92 there is another force measuring cell 96, which is also fastened to the web 92 with its one end, while a compensation mass 98 with the mass m 2 is attached to the end of the force measuring cell 96 facing away from the web. The load cell 96 is therefore aligned with the load cell 90, but is arranged on the other side of the web 92.
- the thread guide eyelet 18 has a mass m 1 .
- vibrations of the thread guide eyelet are generated and these lead to vibrations of the web, which are denoted by a in the drawing.
- Vibrations of the thread guide holder 94 also lead to vibrations of the web. Due to the fluctuating acceleration of the masses m 1 and m 2, these vibrations lead to fluctuations in the forces on the load cells 90 and 96, so that these deliver output signals U1 and U2 with corresponding fluctuations.
- A is the acceleration of the web 92 and F is the desired thread tension.
- F is approximately equal to ⁇ U divided by C1.
- m 1 is constant and ⁇ U can be measured directly, a signal for the thread tension has been obtained by means of the invention.
- a thread tension sensor of the type described last is therefore characterized in that a thread guide eyelet via a load cell on one side of a web a thread guide bracket is attached that on the another load cell on the other side of the web attached and with the first load cell is aligned, one being the mass of the thread guide eyelet compensating mass attached to the second load cell and that the output signals of the two load cells are supplied to a differential circuit whose Output signal of the thread tension is proportional.
- PVDF piezo films available from various manufacturers are, for example from the US company PENNWALT Corporation under the name "KYNAR" (registered trademark).
- PVDF is an abbreviation for polyvinylidene fluoride, which leads to the Class of piezoelectric polymers.
- Piezo foils of this type, suitable for use with the present Suitable are invention are preferably broadband with a Quality factor Q striving towards zero.
- 10a shows a particularly preferred embodiment for the processing of signals from a group of sensors 52.1 to 52.n and by a reference sensor 52.r, by means of of a multiplexer that has 16 inputs.
- n will normally have a maximum value of 15 and the further input is for the reference sensor used.
- a blind thread guide intended for each group of 15 real thread guides i.e. of thread guides that actually have a thread on one Lead spinning station and the circuit according to Fig. 10a is for each group of 15 real thread guides can be duplicated.
- the sensor signals i.e. the signals from sensors 52.1 to 52.n are amplified before multiplexer 150, filtered and rectified by the circuit according to Fig. 5a.
- the individual channels i.e. the signals from sensors 52.1 to 52.n and 52.r with the analog / digital converter 152 one after the other connected, the microcontroller 154 to the multiplexer Sensor address determined.
- the levels of the sensors 52.1 to 52.n are compared with the reference level from the reference sensor 52.r compared in terms of amount, the difference corresponds to Thread tension and can either be used as a reference or after corresponding calibration as an absolute value.
- FIG. 10b shows a further improvement, after which each sensor only a respective amplifier is assigned, and the filter and the analog / digital converter are arranged after the multiplexer.
- Microcontroller 154 gives that Multiplexer the sensor address to be switched through. Behind the signal is filtered in the multiplexer, for example by means of a circuit according to FIG. 8, and by the Analog / digital converter 152 converted into a digital signal. This signal is then sent to the microcontroller 154 fed.
- the system works, consisting of analog / digital converter and microcontrollers not fast enough so a rectifier 156 becomes between the filter and the A / D converter used, which means that no more frequencies up must be converted to 300 Hz and evaluated, but only frequencies of approx. 1 Hz have to be measured.
- the individual Amplifier stages in / at the sensors are replaced by a single gain stage behind the multiplexer.
- the 10a and 10b describe circuit variants which the Allow thread tension measurement on all sensors.
- Fig. 11 deals with the finding whether the thread is broken at the respective spinning positions.
- the sensor signals are processed in parallel here. they are again in groups 52.1 to 52.n together with one Reference sensor 52.r combined. In this case, the The total number of sensors in a group can be up to 32.
- the signals are first amplified, filtered and rectified and then they become in respective comparators, each of which is the comparator 72 5c correspond with the reference signal from the reference sensor 52.r compared.
- the output of the respective comparators 72 is actually a digital signal since the comparator only decides whether the level of one active sensor is higher or lower than the reference level from the reference sensor. All signals are sent to the microcontroller 154 connected to parallel (port) inputs.
- a simple and poorly performing i.e. inexpensive microcontroller used can be (for example, type 80C31 from Intel). A Thread tension measurement is excluded here.
- each Microcontroller 154 each of a single sensor group are assigned, all with a serial data bus communicate, for example the type RS232 or RS485.
- microcontrollers are exemplary for all circuit variants (about 50 pieces per machine) over an advantageous serial data bus connected to a master controller, which, for example, also through the component (chip) 80C31 can be formed by Intel.
- This master controller is intended for the evaluation of thread information and represents the machine control or a process control compressed Data, possibly statistically evaluated, are available.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Quality & Reliability (AREA)
- Spinning Or Twisting Of Yarns (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Description
- Fig. 1a
- eine Seitenansicht einer Fadenführungsöse einer Ringspinnmaschine, wobei diese Öse mit einem Fadensensor ausgestattet ist,
- Fig. 1b
- eine Draufsicht der Ausführung gemäß Fig. 1a,
- Fig. 2
- eine schematische Darstellung einer Spinnstelle einer Ringspinnmaschine mit der Fadenführungsöse der Fig. 1a und 1b,
- Fig. 3a
- eine graphische Darstellung der zeitlichen Abhängigkeit der Auslenkung der Fadenführungsöse bei starker Fadenspannung,
- Fig. 3b
- eine Spektral-Darstellung der Auslenkung bei starker Fadenspannung,
- Fig. 4a
- eine graphische Darstellung der zeitlichen Abhängigkeit der Auslenkung der Fadenführungsöse bei schwacher Fadenspannung,
- Fig. 4b
- eine Spektral-Darstellung der Auslenkung der Fadenführungsöse bei schwacher Fadenspannung,
- Fig. 5a, 5b und 5c
- verschiedene elektronische Sensörsignalbearbeitungsmöglichkeiten,
- Fig. 6
- eine weitere Ausgestaltung eines Fadenspannungssensors, und
- Fig. 7a
- eine schematische Darstellung einer besonderen Ausführung einer Fadenführungsöse, die für die vorliegende Erfindung besonders geeignet ist, wobei die Führungsöse entsprechend den Fig. 1a und 1b eingebaut wird,
- Fig. 7b
- einen Querschnitt nach der Linie VIIb-VIIb der Fig. 7a,
- Fig. 7c
- einen Querschnitt nach der Linie VIIc-VIIc Fig. 7a,
- Fig. 8
- ein Blockschaltbild eines mitlaufenden Filters in SC-Ausführung,
- Fig. 9
- eine schematische Darstellung einer besonderen Ausführung eines Fadenspannungssensors,
- Fig. 10a und 10b
- zwei Möglichkeiten, die von einer Gruppe Fadenspannungssensoren enthaltenen Signale auszuwerten, um Fadenspannungssignale zu erzeugen, und
- Fig. 11
- eine Möglichkeit, die von einer Vielzahl von Sensoren erhaltenen Signale zu verarbeiten, um reine Fadenbruchsignale zu erzeugen.
Claims (11)
- Ringspinnmaschine mit einem Spindelantrieb, mit wenigstens einer eine Spindel (24) umfassenden Spinnstelle (10), mit einem die Spindel (24) drehbar antreibenden Spindelantrieb (100), mit wenigstens einem Fadenführer (18) zum Führen des im wesentlichen unversponnenen Fadens (12) von einer Fadenzuführeinheit (14, 16) zu der Spinnstelle (10), mit wenigstens einem Fadenspannungssensor (32) zur Erzeugung eines für die Fadenspannung des der Spinnstelle (10) zugeführten Fadens (12) repräsentativen Fadenspannungssignals, dessen Pegel mit einem von Maschinenparametern, wie beispielsweise Spindeldrehzahl, Wartungszustand oder dergleichen, abhängigen Referenzpegel verglichen wird, so daß das Ergebnis des Vergleichs der Maschinensteuerung zuführbar ist und bei der Steuerung der Drehgeschwindigkeit des Spindelantriebs (100) im Sinne des Einhaltens einer vorgegebenen Fadenspannung oder eines vorgegebenen Verlaufs der Fadenspannung über dem Kopsbildungsverfahren berücksichtigbar ist.
- Ringspinnmaschine nach dem Anspruch 1,
dadurch gekennzeichnet,
daß zur Fadenspannungsmessung an bestimmten Spinnstellen, beispielsweise an jeder zwanzigsten oder fünfzigsten Spinnstelle ein Fadenspannungssensor vorgesehen ist. - Ringspinnmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Fadenspannungssensor mit dem Fadenführer wenigstens einer der Spinnstellen kombiniert ist, wodurch keine zusätzliche Belastung für den Faden entsteht.
- Ringspinnmaschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Fadenspannungssensor an der Aufhängung (30) eines Fadenführers (18) anbringbar ist, wobei der Sensor ein elektrisches Signal liefert, das die durch die Fadenbewegung in der Fadenführung induzierten Schwingungen wiederspiegelt.
- Ringspinnmaschine nach einem der vorhergehenden Ansprüche 1 bis 4, dadurch gekennzeichnet, daß ein Referenzsensor vorgesehen ist, der ebenfalls wie der eigentliche Fadenspannungssensor (32) bzw. die eigentlichen Fadenspannungssensoren (32, 32.1, ..., 32.n) den Maschinenvibrationen ausgesetzt, jedoch kaum oder nicht durch einen laufenden Faden (12) beeinflußt ist, und daß das Signal des Referenzsensors (80) einen Referenzpegel (URef) für den Fadenspannungssensor (32) bzw. die anderen Meßsensoren (32, 32.1, ..., 32.n) liefert.
- Ringspinnmaschine nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Fadenspannungssensor eine Piezofolie ist, deren Ebene zumindest im wesentlichen in einer die Fadenlaufrichtung enthaltenden Ebene oder einer hierzu parallelen Ebene so angeordnet ist, daß die Aufhängung des Fadenführers elastische Bewegungen zu beiden Seiten ausführt, daß zur Filterung des Steuersignals ein mitlaufender Filter (56), vorgesehen ist, dessen Durchlaßbereich bei zumindest im wesentlichen konstanter Güte entsprechend der Frequenz (f1) eines den Faden aufwickelnden Elementes geführt ist, um entweder die Frequenz (f1) eines den Faden (12) aufwickelnden Elementes (22) und/oder Harmonischen (f2 bis f9) dieser Frequenz (f1) zu gewinnen, und daß eine den Pegel der ausgefilterten Frequenz oder Frequenzen messende Einrichtung (66, 76) vorgesehen ist, deren Ausgangssignal der Fadenspannung entspricht.
- Ringspinnmaschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Fadenspannungssensor derart realisiert ist, daß eine Fadenführungsöse (18) über eine Kraftmeßzelle (90) an der einen Seite eines Steges (92) einer Fadenführungshalterung (94) angebracht ist, daß auf der anderen Seite des Steges (92) eine weitere Kraftmeßzelle (96) an diesem angebracht und mit der ersten Kraftmeßzelle (90) ausgerichtet ist, wobei eine die Masse m1 der Fadenführungsöse (18) kompensierende Masse m2 an der zweiten Kraftmeßzelle angebracht ist, und daß die Ausgangssignale der beiden Kraftmeßzellen (90, 96) einer Differenzschaltung zugeführt werden, deren Ausgangssignal der Fadenspannung proportional ist.
- Anwendung eines Fadenspannungssensors zur Steuerung der Spindeldrehzahl einer Ringspinnmaschine nach einem der Ansprüche 1 bis 7, wobei der Pegel des Fadenspannungssignals mit einem von Maschinenparametern, wie beispielsweise Spindeldrehzahl, Wartungszustand oder dergleichen, abhängigen Referenzpegel verglichen, das Ergebnis des Vergleichs der Maschinensteuerung zugeführt und bei der Steuerung des Einhaltens einer vorgegebenen Fadenspannung oder eines vorgegebenen Verlaufs der Fadenspannung über dem Kopsbildungsverfahren berücksichtigt wird.
- Anwendung eines Fadenspannungssensors nach Anspruch 8, dadurch gekennzeichnet, daß der Fadenspannungssensor eine Piezofolie ist, deren Ebene zumindest im wesentlichen in einer die Fadenlaufrichtung enthaltenden Ebene oder einer hierzu parallelen Ebene so angeordnet ist, daß die Aufhängung des Fadenführers elastische Bewegungen zu beiden Seiten ausführt, daß zur Filterung des Steuersignals ein mitlaufender Filter (56), vorgesehen ist, dessen Durchlaßbereich bei zumindest im wesentlichen konstanter Güte entsprechend der Frequenz (f1) eines den Faden aufwickelnden Elementes geführt ist, um entweder die Frequenz (f1) eines den Faden (12) aufwickelnden Elementes (22) und/oder Harmonischen (f2 bis f9) dieser Frequenz (f1) zu gewinnen, und daß eine den Pegel der ausgefilterten Frequenz oder Frequenzen messende Einrichtung (66, 76) vorgesehen ist, deren Ausgangssignal der Fadenspannung entspricht.
- Anwendung eines Fadenspannungssensors nach dem Anspruch 8 oder 9, dadurch gekennzeichnet, daß der Fadenspannungssensor an der Aufhängung (30) eines Fadenführers (18) anbringbar ist, wobei der Sensor ein elektrisches Signal liefert, das die durch die Fadenbewegung in der Fadenführung induzierten Schwingungen wiederspiegelt.
- Anwendung eines Fadenspannungssensors nach Anspruch 8, dadurch gekennzeichnet, daß eine Fadenführungsöse (18) über eine Kraftmeßzelle (90) an der einen Seite eines Steges (92) einer Fadenführungshalterung (94) angebracht ist, daß auf der anderen Seite des Steges (92) eine weitere Kraftmeßzelle (96) an diesem angebracht und mit der ersten Kraftmeßzelle (90) ausgerichtet ist, wobei eine die Masse m1 der Fadenführungsöse (18) kompensierende Masse m2 an der zweiten Kraftmeßzelle angebracht ist, und daß die Ausgangssignale der beiden Kraftmeßzellen (90, 96) einer Differenzschaltung zugeführt werden, deren Ausgangssignal der Fadenspannung proportional ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3942685 | 1989-12-22 | ||
DE3942685A DE3942685A1 (de) | 1989-12-22 | 1989-12-22 | Verfahren zur gewinnung eines fadenspannungssignals sowie fadensensor |
EP90125114A EP0436204B1 (de) | 1989-12-22 | 1990-12-21 | Verfahren zur Gewinnung eines Fadenlaufsignals |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90125114.0 Division | 1990-12-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0608001A1 EP0608001A1 (de) | 1994-07-27 |
EP0608001B1 true EP0608001B1 (de) | 1999-07-28 |
Family
ID=6396263
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94102738A Expired - Lifetime EP0608001B1 (de) | 1989-12-22 | 1990-12-21 | Ringspinnmaschine mit einem Fadenspannungssensor sowie Anwendung eines Fadenspannungssensors zur Steuerung einer Ringspinnmaschine |
EP90125114A Expired - Lifetime EP0436204B1 (de) | 1989-12-22 | 1990-12-21 | Verfahren zur Gewinnung eines Fadenlaufsignals |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90125114A Expired - Lifetime EP0436204B1 (de) | 1989-12-22 | 1990-12-21 | Verfahren zur Gewinnung eines Fadenlaufsignals |
Country Status (5)
Country | Link |
---|---|
US (1) | US5164710A (de) |
EP (2) | EP0608001B1 (de) |
JP (1) | JPH06229855A (de) |
CS (1) | CS643490A2 (de) |
DE (3) | DE3942685A1 (de) |
Families Citing this family (20)
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US5136202A (en) * | 1990-08-31 | 1992-08-04 | Atochem North America, Inc | Material sensor |
IT1262088B (it) * | 1993-03-17 | 1996-06-19 | Atex Spa | Sistema di controllo qualita' filato e relativo dispositivo |
EP0648332B1 (de) * | 1993-04-29 | 1998-02-18 | B a r m a g AG | Verfahren zur überwachung eines laufenden fadens |
DE4423548A1 (de) * | 1993-08-25 | 1995-03-02 | Rieter Ag Maschf | Fadenüberwachungsvorrichtung |
US5606113A (en) * | 1994-09-06 | 1997-02-25 | The University Of Chicago | Acoustic methods to monitor sliver linear density and yarn strength |
DE4443716A1 (de) * | 1994-12-09 | 1996-06-13 | Hottinger Messtechnik Baldwin | Kraftmeßvorrichtung zur Messung der Zugspannung von Fäden, Bändern oder dergleichen sowie Federblatt und Verfahren zur Herstellung eines Federblatts |
DE19614027A1 (de) * | 1996-04-09 | 1998-01-22 | Inst Textil & Faserforschung | Verfahren zum Nachweis von untexturierten Garnabschnitten in texturierten Filamentgarnen mittels Bestimmung hochfrequenter Fadenzugkraftsschwankungen |
DE19625513A1 (de) * | 1996-06-26 | 1998-01-02 | Schlafhorst & Co W | Verfahren und Vorrichtung zum Herstellen von Kreuzspulen |
JP2000110039A (ja) * | 1998-09-30 | 2000-04-18 | Murata Mach Ltd | 多重撚糸機 |
FI990651A (fi) * | 1999-03-23 | 2000-09-24 | Valmet Corp | Menetelmä ja laitteisto paperi- tai kartonkirainan päänviennin suorittamiseksi |
GB9910331D0 (en) * | 1999-05-06 | 1999-06-30 | Fibrevision Limited | Yarn quality monitoring |
DE19940161A1 (de) * | 1999-08-25 | 2001-03-01 | Schlafhorst & Co W | Vorrichtung zum Abgleich eines Fadenzugkraftsensors |
DE10249278A1 (de) * | 2002-10-23 | 2004-06-09 | Memminger-Iro Gmbh | Fadenspannungssensor |
EP1707523A1 (de) * | 2005-03-31 | 2006-10-04 | Schärer Schweiter Mettler AG | Verfahren und Vorrichtung zum Umspulen von Garnen |
WO2007056884A2 (de) * | 2005-11-18 | 2007-05-24 | Uster Technologies Ag | Verfahren zur charakterisierung von effektgarn |
JP4931069B2 (ja) * | 2007-06-08 | 2012-05-16 | 株式会社豊田中央研究所 | 糸張力検出器及びジェットルームにおける緯糸張力検出装置 |
JP5838768B2 (ja) * | 2011-11-30 | 2016-01-06 | ソニー株式会社 | 検知装置、受電装置、非接触電力伝送システム及び検知方法 |
CN104328549B (zh) * | 2013-01-29 | 2016-08-17 | 潍坊医学院 | 一种用于减少细纱机纱线断头的控制方法及装置 |
CN107190377B (zh) * | 2017-07-10 | 2022-08-26 | 江南大学 | 在线检测环锭细纱机纺纱张力的装置及方法 |
CN111411429A (zh) * | 2020-04-01 | 2020-07-14 | 东华大学 | 一种四罗拉环锭细纱机的须条检测装置 |
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CS260729B1 (en) * | 1987-04-28 | 1989-01-12 | Zdenek Vitamvas | Pickup of textile threads' tractive force |
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-
1989
- 1989-12-22 DE DE3942685A patent/DE3942685A1/de not_active Withdrawn
-
1990
- 1990-12-20 CS CS906434A patent/CS643490A2/cs unknown
- 1990-12-21 EP EP94102738A patent/EP0608001B1/de not_active Expired - Lifetime
- 1990-12-21 EP EP90125114A patent/EP0436204B1/de not_active Expired - Lifetime
- 1990-12-21 DE DE59008432T patent/DE59008432D1/de not_active Expired - Fee Related
- 1990-12-21 DE DE59010879T patent/DE59010879D1/de not_active Expired - Fee Related
- 1990-12-25 JP JP2405805A patent/JPH06229855A/ja active Pending
-
1992
- 1992-04-10 US US07/867,294 patent/US5164710A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0436204A1 (de) | 1991-07-10 |
CS643490A2 (en) | 1991-10-15 |
JPH06229855A (ja) | 1994-08-19 |
DE59010879D1 (de) | 1999-09-02 |
DE59008432D1 (de) | 1995-03-23 |
EP0436204B1 (de) | 1995-02-08 |
EP0608001A1 (de) | 1994-07-27 |
DE3942685A1 (de) | 1991-06-27 |
US5164710A (en) | 1992-11-17 |
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