Classifications

• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
  • D03D47/34—Handling the weft between bulk storage and weft-inserting means
  • D03D47/36—Measuring and cutting the weft
  • D03D47/361—Drum-type weft feeding devices
  • D03D47/367—Monitoring yarn quantity on the drum
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
  • D03D47/34—Handling the weft between bulk storage and weft-inserting means
  • D03D47/36—Measuring and cutting the weft
  • D03D47/361—Drum-type weft feeding devices
  • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
• • D—TEXTILES; PAPER
  • D03—WEAVING
  • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
  • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
  • D03D47/34—Handling the weft between bulk storage and weft-inserting means
  • D03D47/36—Measuring and cutting the weft
  • D03D47/361—Drum-type weft feeding devices
  • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
  • D03D47/363—Construction or control of the yarn retaining devices
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
  • B65H2557/30—Control systems architecture or components, e.g. electronic or pneumatic modules; Details thereof
  • B65H2557/33—Control systems architecture or components, e.g. electronic or pneumatic modules; Details thereof for digital control, e.g. for generating, counting or comparing pulses

Definitions

• the present invention relates to a weft yarn storing, feeding and measuring device, preferably for jet weaving machines, in accordance with the generic clause of claim 1.
• DE-OS 31 23 760 discloses a yarn storing, feeding and measu ⁇ ring device for jet weaving machines having a stationary sto ⁇ rage drum onto which an intermediate yarn store is wound by a windi ⁇ g-on device and from which the yarn is withdrawn spiral ⁇ ling around the withdrawal end of the storage drum, yarn sen ⁇ sing means being arranged such that the yarn is passing its de ⁇ tection area during withdrawal from the drum, said yarn sensing means producing pulse signals, each pulse signal indicating that the yarn passes a detection area of the yarn sensing means, a plurality of yarn stopping devices being arranged at angular in ⁇ tervals around the storage drum, said yarn stopping devices con ⁇ sisting of yarn stopping elements and actuator means moving said stopping elements into and.out of the path of the yarn being withdrawn, and an actuator control device adjustable to desired weft yarn lengths to be withdrawn, said control device being re ⁇ sponsive to said pulse signals in such a way that an actuating signal is transmitted to a yarn stopping device the ang
• the yarn sensing means consists of a plurality of yarn sensors, each of these sensors being associated with a yarn stopping device. Hen ⁇ ce, the number of yarn sensors required for such a device cor ⁇ responds to the number of yarn stopping devices.
• Yarn storing, feeding and measuring devices of this kind not only serve to intermediately store the weft yarn on a storage drum, but also serve to supply the jet weaving machine with a weft yarn length of a desired value. For the latter purpose, this known device
• the yarn stopping device After releasing or de-actuating the yarn stopping device actua ⁇ ted at the end of a previous yarn withdrawal cycle, the yarn is withdrawn spiralling around the withdrawal end of the storage drum. Thereby, the yarn subsequently passes the detection area of each of the several yarn sensors being arranged at the with ⁇ drawal end of the storage drum in a spaced, angular relationship with respect to each other. Each yarn sensor generates a pulse signal indicating that the yarn passes its detection area, these pulse signals being fed to the control device. Hence, the control device receives a number of pulse signals, this number correspon ⁇ ding to the number of yarn sensors being passed by the yarn du ⁇ ring the withdrawal from the storage drum.
• the control device By counting these pul ⁇ se signals received from the yarn sensors, the control device generates a count value corresponding to the actual position of the withdrawal point of the yarn with respect to the yarn sensors.
• the count value corresponds to the length of yarn having been withdrawn from the storage drum.
• the control device actuates the stopping device being located with respect to the angular movement of the withdrawal point of the yarn behind the yarn sensor which generated the last pulse signal. Thereby, the withdrawal of the yarn is stopped so that the desired yarn length is obtained.
• This known yarn storing, feeding and measuring device is costly and complicated due to the great number of yarn sensors required to achieve a sufficiently great number of different yarn lengths, or in other words to achieve a sufficiently great accu ⁇ racy in the desired weft yarn length.
• a further drawback is cau ⁇ sed by the fact that yarn sensors are also sensitive in operation, since they usually comprise optical elements which can be cove ⁇ red by lintor be disturbed by irrelevant light rays. If one of the several yarn sensors is e.g. covered by lint, it will no longer generate pulse signals when the yarn passes its detection area resulting in a wrong count value in the control device. Hen ⁇ ce, the respective yarn length of the inserted weft yarn will be- come greater than the desired yarn length.
• DE-OS 31 23 760 also discloses a yarn storing, feeding and measuring device using only one yarn sensor for detecting the withdrawal of one complete yarn winding from the storage drum.
• this prior art device makes use of a storage drum, the diameter of which can be mechanically varied.
• the same concept is disclosed in FR-A 2 166 332 and PCT-A WO 82/ 04446.
• a mechanical adjustment of the diameter of the storage drum calls for complicated mechanical means, which makes the device costly and liable to malfunctions.
• the object of the present invention is to provide a yarn sto ⁇ ring, feeding and measuring device, which does not have said me ⁇ chanical diameter adjustment means andis more reliable than the prior art devices as described above.
• said control device comprises storing means for storing an information regarding the yarn stopping device actuated at the end of the next preceding yarn withdrawal cycle and calculating means for determining a selected series sequence of.said yarn stopping devices to be alternately actuated and de-actuated consecutively during the yarn withdrawal cycle on the basis of said stored information and of an adjustable input information for the calculating means representing at least one significant parameter for the distance/time function of the weft yarn insertion process cycle, said calculating means also determining the yarn stopping device to be kept actuated at the end of the yarn withdrawal cycle as last one in said selected series sequence of actuated and de-actuated yarn stopping devices, on the basis of said stored information and of an input information representing the desired weft yarn length.
• said significant parameter for the distance/time function of the weft yarn insertion process cycle is the desirable speed value for the weft yarn during said cycle.
• the calculating means of the control device with adjustable input information representing the desirable value of the deceleration of the weft yarn du ⁇ ring the last phase of the weft insertion cycle, so as to achieve an optimally "soft" deceleration of the weft yarn.
• the calcula ⁇ ting means with adjustable input information representing the desirable value of the acceleration of the weft yarn du ⁇ ring the initial phase of the weft insertion cycle.
• Figure 1 shows a side view of the yarn storing, feeding and measuring device in partially cut- and cross-sectio ⁇ nal representation
• Figure 2 shows a front view of the device as shown in Figure 1;
• FIG. 3 and 4 show details of the device shown in Figure 1 and 2;
• Figure 5 shows a circuit diagram of the actuator control device of the measuring device shown in Fig. 1 - 4;
• Figure 6 shows a flow-diagram used in a microprocessor of the actuator control device as shown in Fig. 5.
• Figure 7 shows a schematic diagram of a sequence control accor ⁇ ding to the present invention, where the calculating
• W1PO means of the actuator control device is set with information regarding desirable values of acceleration, maximum speed as well as deceleration of the weft yarn during the whole weft insertion cycle.
• a yarn storing, feeding and measu ⁇ ring device 1 consists of a storage drum 2, a winding-on devi ⁇ ce in the form of an orbiting feeder tube 3 and an electric motor 4 for driving this orbiting feeder tube.
• a weft yarn WY being supplied from a..yarn spool (now shown here) to the orbi ⁇ ting feeder tube 3 driven by the motor 4 is wound onto the sto ⁇ rage drum 2 and forms there an intermediate yarn store of se ⁇ veral yarn windings.
• the storage drum 2 is here a stationary part being kept in stationary position with respect to the surroundings by magnetic means (not shown here).
• the feeding device 1 is provided with a yarn store sensor 5, sensing the amount of yarn stored on the drum 2, which sensor is located close to the generally cylindrical surface of the storage drum 2.
• This store sensor 5 can be a so called maximum sensor preferably consisting of a light emitting device and a light receiving device.
• the yarn store sensor 5 generates a signal indicating the amount of yarn stored on the drum, i.e. in principle the number of windings of yarn stored on the drum. Based on this signal, a store control unit 7 controls the operation of the electric motor 4 in such a way that there is continuously a sufficient amount of yarn available on the yarn storage drum 2.
• Yarn store control units are per se well-known to the man skilled in the art. This art can be exemplified by DE-OS 29 08 743, FR-A 1 562 223 and PCT/EP 83/ 00121 (Applicant's own).
• a yarn stopping device 10 located at the withdrawal end of the storage drum 2 consists of an actuator means 11 comprising a plurality of electromagnetic coils 11 being wound around a coil core 12 supported of a balloon limiting ring 13 consisting
• Said balloon limiting ring 13 is fixedly se ⁇ cured to the stationary part of the storing device 1, for example to a base plate thereof.
• a ring-shaped guiding por ⁇ tion 16 is connected to the withdrawal end of the storage drum 2.
• Said guiding portion 16 supports a plurality of yarn stopping elements 14, each of said yarn stopping elements 14 consisting of a metal ball 14 being movably disposed in a ra ⁇ dial bore 15 provided in the guiding portion 16.
• the respective electromagnetic coils 11 and associated cores 12 are arranged opposite to said bores 15.
• the balloon limiting ring 13 and the guiding portion 16 define a gap 18 being preferably in the order of 1 - 2 millimeters.
• the weft yarn WY passes said gap when be ⁇ ing withdrawn from the storage drum 2.
• a permanent magnet 17 is located at one end of each bore 15 for moving back said metal ball 14 into said bore 15 after switching off an ac ⁇ tuation current fed to the respective electromagnetic coils 11.
• the metal ball 14 is attrac ⁇ ted by the magnetic force of the coil 11 when switching on the actuation current fed to the coil 11.
• the width of the gap 18 corresponds to the radius of the metal ball 14.
• the permanent magnet 17 When the coil 11 is not actuated, the permanent magnet 17 will attract the metal ball 14, so that the ball will be comple ⁇ tely positioned inside the bore 15, whereby the yarn WY can be freely withdrawn in the axial direction from the storage drum 2 and inserted into the shed of the weaving machine.
• each electromagnetic coil 11 is chosen such that this force will overcome the attraction force of the permanent magnet 17 when feeding the actuation current to the coil 11.
• the metal ball 14 will thereby move outward ⁇ ly in the radial direction of the bore 15 and come into con ⁇ tact with the free end of the coil core 12. In this state, approximately half the metal ball locks the gap 18 for the passage of the yarn WY in such a way that the withdrawal of the yarn from the storage drum 2 is prevented .
• the yarn stopping device 10 When swit ⁇ ching off the actuation current fed to the coil 11, the ten ⁇ sion in the yarn WY, being pulled by the weft insertion means of the weaving machine, co-acts with the magnetic force of the permanent magnet 17 such that the metal ball 14 will re ⁇ turn to its starting position so as to come into contact with the permanent magnet 17.
• the tension of the yarn co-acts with the magnetic force of the magnet 17 due to the shape of the metal ball 14, the holding force of the permanent magnet 17 can be relatively small. Hence, only a small portion of the attracting force generated by the electromagnetic coil 11 is required for overcoming the magnetic force of the permanent magnet 17. For this reason, the yarn stopping device 10 is working faster than prior art devices using stopping elements 14 which are needle-shaped or pin-shaped.
• a thin pla ⁇ te of non-magnetic material can be positioned at the outer end of the permanent magnet 17 and/or on the free end of the coil core 12 for eliminating a magnetic sticking or "adhesion" ef ⁇ fect between the metal ball 14 and the permanent magnet 17
• the stopping element 14 can also have the form of a short cylindrical pin with a plane inner end directed to the per ⁇ manent magnet 17 and a rounded, preferably semi-spherical outer en
• This device 8 comprises a calculating means 20, which is a standard microprocessor, here of the type 8748, ma ⁇ nufactured by the INTEL Corp., U.S.A.
• the microprocessor 20 is supplied with sync signals generated by a crystal resonator 31 connected to input pins "XTAL" of the microprocessor.
• a trigg-input 32 receives ⁇ signal picked up at the main shaft of the weaving machine. This signal is applied to the input of an opto-electronical coupling element 33, the out ⁇ put of which is connected to input pin TO of the microproces ⁇ sor 20.
• the trigg-signal serves to synchronize the operation of the loom with the operation of the microprocessor 20 con ⁇ trolling the yarn storing, feeding and measuring device 1. More particularly, the occurrence of a trigg-signal on input 32 indicates that the next weft yarn insertion cycle starts.
• a combined weft yarn inser ⁇ tion speed/yarn length setting switching device preferably consisting of three BCD-switches 34 - 36 and a Hexa-decimal code switch 37, each of these switches having four input ter ⁇ minals and one output terminal.
• the respective first input terminals of the switches 34 - 37 are connected via diodes to pin DB3 of the microprocessor 20, the respective second input terminals of the switches are connected via diodes to pin DB2 of the microprocessor, the respective third input terminals of the switches are connected via diodes to pin DB1 of the microprocessor and the respective fourth input termi ⁇ nals of the switches are consequently connected via diodes to pin DB0 of the microprocessor 20.
• the respective output termi ⁇ nals of the switches 34 - 37 are connected to output pins P40 - P43 of an expansion circuit 38, here a standard circuit INTEL type 8243 ("I/O Expander"), the four input pins of which are
• each of the pins DBO - DB3 of the microprocessor 20 is in its "high" state, i.e. logical one potential.
• the pins P20 - P23 of the microprocessor 20 are also in the "high” state.
• the microprocessor 20 pulls down the voltage of one of its pins P20 - P23.
• the micropro ⁇ cessor 20 For examp ⁇ le, for reading the BCD value of BCD-switch 34, the micropro ⁇ cessor 20 generates a certain, predetermined combination of "high” and “low” potential (logical one and zero) on the four pins P20 - P23 and on its output pin called PROG, which is con ⁇ nected to the PROG input pin of the expansion circuit 38.
• the expansion circuit 38 will respond to said combination of "high” and "low” potential on its pins P20 - P23 and PROG by genera ⁇ ting a "low” potential (logical zero) on its output pin P40.
• Output pins P10 - PI7 of the microprocessor 20 are connected to input pins 1 - 8 of an amplifier or driver circuit 39, this circuit having eight output pins 11 - 18, each of these being associated with a respective input pin 1 - 8.
• the driver circuit 39 When receiving "high" potential (logical one) on one its input pins 1 - 8, the driver circuit 39 connects the corresponding output pin to a voltage source of - 35 Volts.
• Each of the output pins 11 - 18 of the driver circuit 39 is connected to three elec ⁇ tromagnetic coils 11. Twenty-four electromagnetic coils 11 associated with twenty-four yarn stopping devices 14 are ar ⁇ ranged as a matrix having eight rows and three columns. The respective output terminals of the electromagnetic coils 11 arranged in one column are connected to a respective one of three output conductors 40 - 42.
• Output pins P24 - P26 of the microprocessor 20 are connected through current amplifier circuits 43 - 45 to input pins 1 - 3 of a further driver circuit 46.
• This driver circuit 46 inclu ⁇ des three output pins 14 - 16, each being connected to a res ⁇ pective one of the conductors 40 - 42.
• the driver circuit 46 connects the corresponding output pin to a voltage of + 5 Volts.
• the microprocessor 20 is enabled to energize one of the twenty-four electromagnetic coils 11 by generating a "high" potential on one the output pins P10 - PI7 determining the row of the coil 11 to be actuated, and by generating a "high" po ⁇ tential on one of its output pins P24 - P26 selecting the co ⁇ lumn of the electromagnetic coil 11 to be actuated.
• the above described matrix circuit arrangement allows to actuate one electromagnetic coil 11 among the twenty-four electromagnetic coils 11 with only eleven output pins P10 - PI7 and P24 - P26 of the microprocessor 20 and as many signal wires to the coils 11.
• Output pin P51 of the expansion circuit 38 is connected via a current amplifier or driver circuit 49 to a light-emitting element 50, which in turn is connected to minus via a resis ⁇ tor 51.
• the light-emitting element 50 actuates an opto-sensi- tive switching element 52 actuating in turn a stop-motion re ⁇ lay (not shown here, but well-known to the man skilled in the art) of the weaving machine.
• Output pin P50 of the expansion circuit 38 is connected via said driver circuit 49 to a relay of the valve for the main air jet nozzle (also well-known to the man skilled in the art) of the jet weaving machine.
• the driver circuits 39 and 49 are standard circuit elements of the type UDN 2580A.
• the further driver circuit 46 is also a standard circuit element of the type UDN 2002.
• the manufac ⁇ turer of said standard circuit elements is the SPRAGUE Corp., U.S.A.
• FIG. 6 there is shown a flow diagram of the control programme stored in the read-only memory of the presently preferred embodiment of the microprocessor 20.
• the microprocessor 20 When receiving a reset signal, the microprocessor 20 is re ⁇ set so as to start the carrying out of the programme with the first instruction thereof, being the "START" instruction.
• This reset signal will be received on reset line 53 and will pass through a reset interface circuit 54 to the reset pin R of the microprocessor 20.
• the reset signal is automatically generated each time the main power of the weaving machine is switched on, which guarantees that the microprocessor begins to carry out the control programme with the START step after switching on the power of the weaving machine.
• the microprocessor 20 actuates a predetermined yarn stopping device 10 for locking the weft yarn WY in its start of withdrawal position.
• the micropro ⁇ cessor 20 stores the number of the actuated stopping device or its angular position in a predetermined storage cell of its RAM (Randon Accessary Memory).
• the microprocessor 20 reads the hexa-decimal code of the switch 37 representing a desired, aanually set value of the weft yarn insertion speed, and stores this value in a storage cell of its RAM.
• the microprocessor 20 consecutively reads the BCD code of the switches representing the desired, manually set weft yarn length and stores this length value in another storage cell of the RAM of the microprocessor.
• the microprocessor 20 transfers the BCD codes representing the set desired weft yarn length to a digital value corresponding to the number of withdrawal revo ⁇ lutions and 1/24 revolutions of the storage drum 2, whereby this digital value represents the number of revolutions around the storage drum which the withdrawal point of the yarn travels during one weft yarn insertion cycle, i.e. during withdrawal of the desired, set weft yarn length.
• the microprocessor 20 determines which yarn stopping device shall be actuated by the end of the present weft yarn withdrawal (and insertion) cycle. The number of the determined stopping device is stored in a predetermined sto ⁇ rage cell of the RAM of the microprocessor.
• a waiting routine causing the microprocessor 20 to await the receipt of a trigg-signal from the weaving machine, e.g. in the form of a signal repre ⁇ senting the actual position of the main shaft of the weaving machine at the moment when the present weft yarn insertion cycle shall start.
• This trigg-signal can be generated by a rotary sensor, per se well-known to the man skilled in the art, reading the angular position of the main shaft of the weaving machine.
• This waiting routine is realized by a pro ⁇ gramme loop periodically checking whether said trigg-signal occurs. If this condition is fulfilled, the microprocessor 20 continues to programme step No. 6.
• the microprocessor 20 generates, by generating a predetermined combination of "high” and “low” potential on its output pins P20 - P23 and PROG, a "high” potential on output pin P50 of the expansion cir ⁇ cuit 38, whereby the main air jet nozzle of the weaving machine will be opened.
• the yarn stopping device 10 actuated during programme step No. 1 is de-actuated for releasing the locked weft yarn for withdrawal from the storage drum 2. From this moment the weft yarn will be pulled by the opened main air jet nozzle and withdrawn from the drum 2, whereby the withdrawal point will travel around the circumference or periphery of the withdrawal end of the drum 2.
• the microprocessor 20 will, in programme step No. 8, actuate the yarn stopping device in the position next before the stopping device that was de-actuated in programme step No. 7.
• the microprocessor will, in programme step No. 8, actuate the yarn stopping device in the position next before the stopping device that was de-actuated in programme step No. 7.
• the microprocessor will, in programme step No. 8, actuate the yarn stopping device in the position next before the stopping device that was de-actuated in programme step No. 7.
• yarn stopping device EM will be actuated in programme step No. 8.
• Programme step No. 9 involves a time delay which varies in de ⁇ pendence on the set desired weft yarn insertion speed on code switch 37. After this time delay, the microprocessor 20 conti ⁇ nues to programme step No. 10, in which the yarn stopping de ⁇ vice as actuated in programme step No. 8 will be de-actuated again, so as to allow the yarn to pass this stopping device during its continued withdrawal from the drum.
• the microprocessor 20 examines the condition whether the point of time for switching off the valve of the main air jet nozzle has been reached, which point of time has been calculated by the microprocessor on the basis of the point of time for switching on the main nozzle, the set weft yarn length and the set weft yarn speed. 23 1
• the microprocessor conti ⁇ nues with programme step No. 12, in which the microprocessor examines whether the point of time for actuating the yarn stop ⁇ ping device determined in programme step No. 4 has been reached.
• step No. 11 If the condition at programme step No. 11 is fulfilled, the microprocessor goes to step No. 13, in which it switches off the main air jet nozzle, before it continues to step No. 12.
• the microprocessor 20 goes back to programme step No. 8, in which it now actuates the yarn stopping device in the position next before the stopping device that was de-actuated in pro ⁇ gramme step No. 10, that is in this case stopping device EM .
• the microprocessor 20 then continues to go through the loop consisting of programme steps No. 9, 10, 11, 12 and back to No. 8, until the condition in step No. 12 is fulfilled, that is until the point of time for actuating the yarn stopping device determined in programme step No. 4 has been reached.
• step No. 14 the yarn stopping device as determined during program ⁇ me step No. 4 is actuated for finally stopping the yarn with ⁇ drawal at the end of the weft yarn insertion cycle.
• the microprocessor 20 exami ⁇ nes whether there is still an occurring trigg-signal from the weaving machine. If this signal has meanwhile disappeared, the microprocessor goes back to programme step No. 2 again and all the programme steps for carrying out a new weft yarn insertion cycle (withdrawal cycle) are repeated again.
• the present invention is not limited to the embodiment descri ⁇ bed above but several other embodiments are possible within the scope of the invention, particularly with regard to the selected sequence of yarn stopping devices to be consecutive ⁇ ly actuated and de-actuated during the yarn withdrawal cycle.
• Figure 7 shows a schematic diagram of a more ad ⁇ vanced sequence control of the yarn stopping devices in accor ⁇ dance with the present invention, where the actuator control device has been set with information of desirable values of not only weft yarn speed, but also of acceleration as well as deceleration for the weft yarn.
• the setting of desired value of acceleration calls for an addi ⁇ tional code switch, preferably of the hexa-decimal type.
• Setting of a desired deceleration value also calls for an additional code switch.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Looms (AREA)
• Forwarding And Storing Of Filamentary Material (AREA)
• Light Guides In General And Applications Therefor (AREA)
• Optical Communication System (AREA)

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Citations (2)

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• 1982
  • 1982-12-10 SE SE8207098A patent/SE8207098D0/xx unknown
• 1983
  • 1983-12-12 EP EP84900144A patent/EP0128927B1/en not_active Expired
  • 1983-12-12 EP EP84900143A patent/EP0128926B1/en not_active Expired
  • 1983-12-12 DE DE8484900144T patent/DE3379407D1/de not_active Expired
  • 1983-12-12 US US06/641,900 patent/US4595039A/en not_active Expired - Lifetime
  • 1983-12-12 JP JP59500292A patent/JPS60500339A/ja active Granted
  • 1983-12-12 JP JP59500236A patent/JPS60500338A/ja active Pending
  • 1983-12-12 WO PCT/SE1983/000447 patent/WO1984002361A1/en not_active Ceased
  • 1983-12-12 WO PCT/SE1983/000446 patent/WO1984002360A1/en not_active Ceased
  • 1983-12-12 DE DE8484900143T patent/DE3379473D1/de not_active Expired
  • 1983-12-12 US US06/641,899 patent/US4541462A/en not_active Expired - Fee Related

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