EP0329947B1 - Verfahren und Vorrichtung zum Wickeln konischer Kreuzspulen - Google Patents

Verfahren und Vorrichtung zum Wickeln konischer Kreuzspulen Download PDF

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Publication number
EP0329947B1
EP0329947B1 EP89101015A EP89101015A EP0329947B1 EP 0329947 B1 EP0329947 B1 EP 0329947B1 EP 89101015 A EP89101015 A EP 89101015A EP 89101015 A EP89101015 A EP 89101015A EP 0329947 B1 EP0329947 B1 EP 0329947B1
Authority
EP
European Patent Office
Prior art keywords
bobbin
empty tube
thread
outer diameter
velocity
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.)
Expired - Lifetime
Application number
EP89101015A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0329947A1 (de
Inventor
Hubert Lochbronner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CAMBIO RAGIONE SOCIALE;RIETER INGOLSTADT SPINNEREI
Original Assignee
Schubert und Salzer Maschinenfabrik AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schubert und Salzer Maschinenfabrik AG filed Critical Schubert und Salzer Maschinenfabrik AG
Publication of EP0329947A1 publication Critical patent/EP0329947A1/de
Application granted granted Critical
Publication of EP0329947B1 publication Critical patent/EP0329947B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H54/00—Winding, coiling, or depositing filamentary material
    • B65H54/02—Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
    • B65H54/28—Traversing devices; Package-shaping arrangements
    • B65H54/34—Traversing devices; Package-shaping arrangements for laying subsidiary winding, e.g. transfer tails
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H54/00—Winding, coiling, or depositing filamentary material
    • B65H54/02—Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
    • B65H54/40—Arrangements for rotating packages
    • B65H54/42—Arrangements for rotating packages in which the package, core, or former is rotated by frictional contact of its periphery with a driving surface
    • 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
    • B65H63/08—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to delivery of a measured length of material, completion of winding of a package, or filling of a receptacle
    • B65H63/082—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to delivery of a measured length of material, completion of winding of a package, or filling of a receptacle responsive to a predetermined size or diameter of the package
    • 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 method according to the preamble of claim 1 and an apparatus for performing the method.
  • a centering spindle is used during piecing, which shifts the thread fed with the aid of take-off rollers to the end of the bobbin with the larger diameter, the bobbin being driven by means of an auxiliary drive roller during piecing . Since there is a clear difference between the circumferential speed at each end of the coil and the circumferential speed in the middle of the coil where the coil or empty sleeve is driven, mainly because of the taper of the coil or empty tube, the drive speed of the coil or empty tube when spinning is used in practice reduced by an average of 2%. It is assumed that the thread is wound on the end of the empty tube with the larger diameter.
  • a buffer is provided for the thread, which compensates for speed differences, the size of the stored thread length being controlled by driving the bobbin or empty tube with changing speeds.
  • DE-OS 2,458,853 it is proposed to use a plurality of axially distributed rollers for driving, which are successively driven synchronously with the movement of the oscillating thread guide, in order to wind up the thread with essentially constant tension.
  • the invention has for its object to provide a method and an apparatus to exclude thread breaks or irregularities that could occur due to differences in speed between thread delivery and thread winding during winding in connection with piecing.
  • the determined actual outside diameter of the bobbin is the size from which, assuming the conicity of the bobbin is known, it is possible to infer exactly the differences in the peripheral speed between the longitudinal center of the bobbin and the ends of the bobbin when the bobbin is changed or pieced.
  • This actual outside diameter can be determined at the large or small diameter or in the middle between the two coil ends. Because the drive speed of the bobbin is changed in relation to the working speed in strict dependence on the determined actual outside diameter, the thread arriving at the specified delivery speed runs onto the bobbin correctly, so that thread breaks due to the large thread tension on the one hand and unevenness in the winding pattern due to too little On the other hand, thread tension can be reliably avoided. It is advantageous that the thread is wound unchanged at the respectively set delivery speed when changing bobbins or piecing, so that the spinning process does not necessarily have to be interrupted or reversed.
  • the procedure according to claim 2 is expedient because the throttling of the drive speed relative to the working speed as a function of the actual outside diameter of the coil corresponds exactly to the actual circumstances, which leads to a substantially improved winding quality compared to the known method with a general reduction in the drive speed.
  • the change in the drive speed which is strictly dependent on the determined actual outside diameter of the bobbin or empty tube, enables piecing at high thread speeds.
  • the mean actual outside diameter is the value that is easiest to determine in terms of process and device. From the value of the average actual outside diameter, it is possible to draw precise conclusions about the speed differences that result over the coil length between the coil ends. Data transmission is a low-error, sufficiently fast and extremely precise method that is particularly suitable for this problem.
  • the evaluation and conversion of the determined values into the change in the drive speed is carried out in the usual way by means of one or more microprocessors.
  • a further, expedient variant of the method in which the spool held by the spool support arms is pivoted from the working position into a fixed spool release position for spinning is disclosed in claim 5.
  • the actual outside diameter can be deduced exactly from the extent of the pivoting or the duration of the pivoting movement of the coil support arms from the working position into the coil release position, wherein advantageously necessary components are used anyway for the operation of the device.
  • a further, expedient variant of the method, in which an auxiliary drive roller can be moved from a passive position in contact with the circumference of the coil or empty sleeve for piecing, can be seen from claim 5.
  • the extent or the duration of the movement of the auxiliary drive roller between the defined passive position and its abutment on the circumference of the spool or empty tube also allows an exact conclusion to be drawn about the actual outside diameter of the spool or empty tube.
  • a device according to claim 9 is particularly suitable for carrying out the method, in which sensors or light barriers are actuated in succession via the growing outside diameter of the coil, so that they are able to tell the control unit the actual outside diameter exactly.
  • sensors or light barriers are reliable and space-saving.
  • Another embodiment of the device which has a bobbin and the bobbin, pivotable bobbin support arms, which can be pivoted to a degree dependent on the actual outside diameter of the bobbin in a bobbin release position when spinning, claims 10 and 11.
  • components contained in the device are used here anyway to determine the actual outside diameter. To determine the actual outside diameter, it is not necessary to intervene in the immediate range of movement of the coil, but the actual outside diameter is tapped exactly at a point distant from the coil.
  • an embodiment of the device has proven useful, as can be gathered from claim 12.
  • a potentiometer or a timer circuit are reliable components that are not susceptible to contamination and that are compact and generate usable signals.
  • a further, alternative embodiment of the device in which an auxiliary drive roller which can be pivoted between a fixed passive position and a drive position which is dependent on the actual outer diameter of the coil, is provided for driving the coil during piecing, the auxiliary drive roller being connected to a drive device controlled by the control unit stands out from claim 13.
  • the measuring device is used away from the movement range of the coil in order to determine the respective actual outside diameter via a component which is anyway necessary for the function of the device and to transmit this to the control unit.
  • the embodiment of the device according to claim 14 is also expedient, in which a control unit is provided which is connected to the take-off rollers supplying the thread and to a drive device for the bobbin and contains a computing element which continuously determines and stores the thread spinning length. Since the control unit is informed about the thread spinning length anyway as usual, it no longer means any significant additional effort to expand the computing element in such a way that that it determines the actual outside diameter of the bobbin during piecing with predetermined and stored values over the thread spinning length and enables the control unit to control the speed change required for this for the drive device.
  • a conical coil 6 (FIG. 2) or empty sleeve 7 is driven in its longitudinal center M (FIG. 1) by means of a drive roller 9 via its outer diameter D in the middle length range at a predetermined working speed
  • the peripheral speeds differ near the two coil ends e and E due to the outer diameters D2 and Dl differing there from the mean outer diameter D considerably from the working speed.
  • the graph according to FIG. 4 illustrates in curve form these speed differences ⁇ V (e, E), for example for a coil with a conicity of 2 ° and a coil with a conicity of 4 ° 20 '.
  • the average outer diameter D is plotted on the horizontal axis, while the speed change is given in percent on the vertical axis.
  • the vertical axis reflects the positive and negative speed changes ⁇ V (e, E), which are located between the outer diameter D and the outer diameters D1 and D2 at the two ends e and E of the coil 6 surrender.
  • the values for the speed changes ⁇ V (e, E) to be taken into account are determined empirically for different conicity and fiber materials. For example, in the case of a coil 6 with a taper of 2 °, there is a change in speed of approximately + 5%, while the change in speed in the case of a 4 ° 20 ′ coil, for example in the case of an empty coil sleeve 7, is more than + 10%.
  • the diagram according to FIG. 4 also clearly shows that these speed differences gradually decrease with increasing average outer diameter D.
  • the diagram thus clearly shows that when the bobbin tube is empty after a bobbin change and when the usual thread reserve F R (FIG. 1) is formed at the end E of the bobbin 6 with the larger diameter D1, the thread supplied is up to 15% too quickly is wound up, which causes an increase in the thread tension which may lead to a thread break, although the empty tube 7 is driven in its middle length range at the thread delivery speed.
  • the peripheral speed of the empty tube 7 or the bobbin 6 in the run-up region of the thread F will no longer be sufficient to maintain the basically predetermined thread tension , so that the thread 5 loosens and generates an uneven winding pattern.
  • the drive speed of the empty tube 7 or the bobbin 6 is changed in relation to the working speed during a piecing process, ie raised or lowered, in order to ensure a uniform pick-up of the thread arriving at a fixed delivery speed.
  • the peripheral speed of the empty sleeve 7 or the coil 6 is in strict dependence on the actual outer diameter D, Dl or D2 of the empty sleeve 7 or the coil 6 (see curves of FIG. 4) and depending on the respective taper of the coil 6 changed.
  • the actual outside diameter must be determined.
  • the thread F comes from a spinning element designed, for example, as an OE rotor 2. It runs between take-off rollers 3, which are connected to a drive device 4 and determine the delivery speed of the thread F.
  • the empty sleeve 7 or the coil 6 is rotatably held in the usual manner by coil support arms 5, expediently with the aid of coil plates 8 and 8a.
  • a drive roller 9 engages on its outer circumference on the average actual diameter D, which drive roller can be the main drive for winding or also an auxiliary drive, and which is in motion-transmitting connection with a drive device 10.
  • a centering spindle 11 is used for a piecing process in connection with a bobbin change or also for thread breakage elimination.
  • the centering spindle 11 is connected to a drive device l2 and has a part of small diameter that runs out with a discharge end l3.
  • the centering spindle 11 is provided with opposite threads ll0, llll on its surface and with a central centering groove ll2, so that centering of the thread F is just as possible as a forced movement of the thread F towards the smaller end e or in the direction to the larger end E of the bobbin 6.
  • an alternating thread guide 14 is also provided, which is moved back and forth in the longitudinal direction of the bobbin 6 and guides the thread F.
  • the thread guide 14 is not used during piecing.
  • control unit designated by l5 which controls the individual components of the spinning station 1.
  • the control unit has, for example, an input part 16 and a computing element 40 (for example a microprocessor) with memories 42 and 43.
  • the drive device 10 for the coil 6 is connected to the control unit 15 via a control line 17, while the drive devices 12 and 4 for the centering spindle 11 or the take-off rollers 3 are connected to the control unit l5 via the control lines or signal lines l8 and l9.
  • the drive device l0 when driving the thread guide l4 in a cross winding manner, the drive device l0 is driven at a working speed which results from the delivery speed of the take-off rollers 3.
  • the speed changes which then occur when the thread F runs between the longitudinal center M and the two ends e and E of the bobbin 6 are compensated either by compensating means for the thread tension (not shown) or by correspondingly controlling the movement of the thread guide 14.
  • the drive speed of the drive device 10 and thus the drive roller 9 is changed relative to the working speed as a function of the actual outer diameter of the bobbin 6 in such a way that the peripheral speed of the bobbin 6 in the run-up region of the thread F corresponds to the delivery speed.
  • the run-up area of the thread F is understood to be the area of the empty tube 7 or the bobbin 6, onto which the thread F runs when spinning, ie when the thread reserve F R indicated in FIG. 1 is formed.
  • a change in the drive speed is possible in that in the control unit l5 in the computing element 40, which is preprogrammed with corresponding data about the conicity of the bobbin 6 and various actual outside diameter values corresponding to predetermined thread spinning length values, for example by monitoring the number of the revolutions of the take-off rollers 3, the thread spinning length is continuously determined and stored, so that the computing element 40 can infer the actual outer diameter D, D1 or D2 of the bobbin 6 from the respective thread spinning length. Furthermore, the arithmetic element 40 is preprogrammed in accordance with one of the curves in FIG.
  • the actual outside diameter is then determined via the actual thread spinning length and the necessary change in the drive speed of the drive device 10 is then determined via the actual outside diameter.
  • the thread spinning length is still zero, so that the computing element 40 determines the maximum change (see FIG. 4) of the drive speed with a known bobbin size and taper.
  • the computing element 40 determines the respective actual outside diameter, expediently the mean actual outside diameter D of the bobbin 6, and thus calculates the extent of the speed change for the drive device 10, which is necessary, for example, for a piecing process.
  • Appropriate programming can also take into account a different increase in the bobbin diameter when processing different thread material.
  • the computing element 40 is deactivated, whereupon the control unit 15 drives the drive device 10 again at the working speed predetermined by the take-off rollers 3.
  • the thread F runs between the take-off rollers 3 and is deflected on a deflection roller 3 ', which can also be a compensating device, in order then to be wound up over the winding roller 9a onto the empty tube 7 or onto the bobbin 6 indicated in broken lines.
  • the thread guide l4 takes over the changing function during the normal cross winding process.
  • the winding roller 9a is connected to a drive device 10a which is connected to the control unit 15 via a control line 17a.
  • the empty sleeve 7 or the coil 6 is carried by the coil support arms 5, which are held in a pivot bearing 20 in a stationary but pivotable manner.
  • a separating element 43 can be inserted between the winding roller 9a and the bobbin 6, which suddenly interrupts the drive of the bobbin 6 by the main drive roller 9a.
  • a swivel bracket 2l is provided for an auxiliary drive roller 9b, which is connected to a drive l0b which is connected to the control unit l5 via a control line l7b.
  • the swivel bracket 2l is provided with a movement device, not shown, with which the auxiliary drive roller 9b can be placed against the circumference of the coil 6 from a passive position defined by a stop 22, a spring 23 ensuring contact pressure of the auxiliary drive roller 9b.
  • the swivel bracket 2l is in a stationary swivel bearing 24, e.g. in a maintenance device 4l, which can be moved back and forth in front of the spinning positions of a spinning device and can be placed in front of the respective spinning station for a bobbin change or for piecing.
  • a button 25 is attached, which cooperates with a potentiometer or a timing circuit, which forms a measuring device 26 with which the extent and / or the duration of the (uniform) movement of the swivel bracket 2l from the passive position at the stop 22 to System on the circumference of the coil 6 can be determined and converted into a control signal. Since the auxiliary drive roller 9b reaches the circumference of the spool 6 the sooner the larger the actual outside diameter D of the spool 6, the extent of the movement of the swivel mount 2l or the duration of this movement is a measure of the actual outside diameter D.
  • the measuring device 26 is connected via connection lines 27 to an interface 35 and via this via a control line 34 to the control unit 15.
  • the auxiliary drive roller 9b is only used during a piecing process, while the winding roller 9a is not in drive connection with the bobbin 6 or empty tube 7, the actual outer diameter can be obtained in this way D simply determine the coil 6 or the empty sleeve 7, so that the control unit 15 is able to control the drive speed of the drive device 10b accordingly.
  • a support device 28 is also provided for the bobbin support arms 5, which is also used when changing the bobbin or during a piecing process.
  • the support device 28 has a support fork 29 which normally assumes its end position on a stop 30. It is pivotable about a pivot bearing 3l and is acted upon by a movement drive, not shown, in order to raise the bobbin support arms 5 when changing bobbins or when piecing, so that the bobbin 6 no longer cooperates with the bobbin roller 9a, but with the auxiliary drive roller 9b.
  • the support device 28 is only moved so far that the coil circumference is at a predetermined distance from the winding roller 9a.
  • the extent of the pivoting movement of the support device 28 varies depending on the actual outside diameter of the coil 6, the extent of the pivoting movement can be used to determine the actual outside diameter D of the coil 6.
  • the spool support arms 5 are pivoted by the same swivel path as a function of the respective actual outer diameter D of the spool 6 in order to remove the spool circumference by a predetermined amount from the spooling roller 9a, but the position of the swivel range changes so that this different swivel range position can be used to determine the actual outside diameter D of the coil 6 or the empty sleeve 7.
  • the time period for this pivoting movement can be used to determine the mean actual outer diameter D of the empty tube 7 or the spool 6.
  • an extending pointer 32 is attached to the fork 29, which can be moved and moved along a potentiometer or a timing circuit 36
  • Lines 33 is able to output signals to the interface 35, which represent the respective actual outside diameter D and which enable the control unit 15 to control the drive device 10b accordingly, ie to reduce or increase the drive speed compared to the delivery speed of the thread F.
  • the support device 28 is also contained in the maintenance unit 4l, so that the maintenance unit 4l is used to transmit the actual outside diameter D of all the spinning stations provided to the control unit l5 when a piecing operation is due there, which is expediently the central control unit of the spinning device.
  • a thread suction device 37 as well as a pivotable suction pipe 38 and other means, not shown, which are required for piecing and / or changing the bobbin.
  • these means have nothing to do with the speed control during piecing or when changing the bobbin, so that for the sake of simplicity reference is made to DE-OS 3.123.494, which provides clearer information on this.
  • FIG. 3 illustrates a detailed variant for determining the actual outer diameter D of the coil 6 or the empty sleeve 7.
  • optoelectronic or other contactless sensors or light barriers which are movable with the coil support arms 5 or are fixed relative to the axis of the coil 6 are shown Ll to L4 provided in a row arrangement such that the coil 6 with increasing actual outer diameter D covers an increasing number of light barriers Ll to L4, which are in signal-transmitting connection via control lines 39 with the control unit l5 and the actual outer diameter D of the coil 6 provide representative signals from which the control unit l5 can make the change in the drive speed of the coil 6 during piecing in the aforementioned manner.
  • the light barriers L1 to L4 are expediently assigned to the mean outer diameter D of the coil 6. However, it would also be conceivable to scan the small or large actual outer diameter D1 or D2 of the coil 6 at one or the other end e or E.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Winding Filamentary Materials (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
EP89101015A 1988-02-24 1989-01-20 Verfahren und Vorrichtung zum Wickeln konischer Kreuzspulen Expired - Lifetime EP0329947B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3805656 1988-02-24
DE3805656A DE3805656A1 (de) 1988-02-24 1988-02-24 Verfahren und vorrichtung zum wickeln konischer kreuzspulen

Publications (2)

Publication Number Publication Date
EP0329947A1 EP0329947A1 (de) 1989-08-30
EP0329947B1 true EP0329947B1 (de) 1992-09-09

Family

ID=6347989

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89101015A Expired - Lifetime EP0329947B1 (de) 1988-02-24 1989-01-20 Verfahren und Vorrichtung zum Wickeln konischer Kreuzspulen

Country Status (5)

Country Link
US (1) US4988048A (cs)
EP (1) EP0329947B1 (cs)
JP (1) JP2662016B2 (cs)
CZ (1) CZ284237B6 (cs)
DE (2) DE3805656A1 (cs)

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EP0950631B1 (de) * 1998-02-14 2003-08-06 Volkmann GmbH Verfahren und Vorrichtung zur Garnaufwicklung auf einen konischen Spulenkörper
DE19915529A1 (de) * 1999-04-07 2000-10-12 Schlafhorst & Co W Vorrichtung zum Wickeln konischer Spulen bei konstanter Fadenliefergeschwindigkeit
DE20101126U1 (de) * 2001-01-23 2001-04-19 Dietze & Schell Vorrichtung an einem Direkt-Rovingwickler zum berührungslosen Erfassen des Istdurchmessers der Rovingspule und Direkt-Rovingwickler mit einer solchen Vorrichtung
DE10139075A1 (de) * 2001-08-09 2003-02-20 Schlafhorst & Co W Offenend-Rotorspinnmaschine
TWI242533B (en) * 2003-09-26 2005-11-01 Fuji Spinning Co Ltd A cone of an elastic yarn and a method for producing the same
US7325766B1 (en) * 2005-06-24 2008-02-05 Schunck Robert J Automatic bobbin winder system
EP2042877B1 (de) * 2007-09-28 2012-02-08 Gebrüder Loepfe AG Verfahren und Vorrichtung zum Messen der Geschwindigkeit eines Garns
DE102008015908A1 (de) * 2008-03-27 2009-10-01 Oerlikon Textile Gmbh & Co. Kg Verfahren zum Aufspulen eines Fadens auf einem Spulenkörper zu einer Kreuzspule
DE102008015907A1 (de) * 2008-03-27 2009-10-01 Oerlikon Textile Gmbh & Co. Kg Verfahren zur Steuerung einer von einem einzelmotorischen Antrieb angetriebenen Changiereinrichtung an einer Vorrichtung zum Wickeln konischer Kreuzspulen sowie eine Kreuzspulen herstellende Textilmaschine
DE102012002579A1 (de) * 2012-02-09 2013-08-14 Oerlikon Textile Gmbh & Co. Kg Verfahren und Vorrichtung zur Ermittlung der erforderlichen Drehzahl einer Spulenantriebswalze
CZ306287B6 (cs) * 2015-04-07 2016-11-16 Rieter Cz S.R.O. Způsob ukončení předení na pracovním místě rotorového dopřádacího stroje
CN108357975B (zh) * 2018-04-19 2019-01-01 南通德和布业有限公司 一种纺织绕线机构
DE102020127007A1 (de) 2020-10-14 2022-04-14 Saurer Spinning Solutions Gmbh & Co. Kg Verfahren zum Betreiben einer Spinnmaschine und Spinnmaschine
DE102021005131A1 (de) * 2021-10-13 2023-04-13 Oerlikon Textile Gmbh & Co. Kg Verfahren zum Aufspulen eines anlaufenden Fadens

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Also Published As

Publication number Publication date
DE3805656A1 (de) 1989-09-07
EP0329947A1 (de) 1989-08-30
US4988048A (en) 1991-01-29
CS112389A3 (en) 1992-01-15
JPH028151A (ja) 1990-01-11
CZ284237B6 (cs) 1998-10-14
DE58902218D1 (de) 1992-10-15
JP2662016B2 (ja) 1997-10-08
DE3805656C2 (cs) 1990-06-13

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