EP1306481B1 - Verfahren zum Regulieren der Feuchtigkeit von Wäsche , beim Verlassen einer Trocknungs- und Bügelmaschine und Maschine zur Verwendung dieses Verfahrens - Google Patents

Verfahren zum Regulieren der Feuchtigkeit von Wäsche , beim Verlassen einer Trocknungs- und Bügelmaschine und Maschine zur Verwendung dieses Verfahrens Download PDF

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Publication number
EP1306481B1
EP1306481B1 EP02292626A EP02292626A EP1306481B1 EP 1306481 B1 EP1306481 B1 EP 1306481B1 EP 02292626 A EP02292626 A EP 02292626A EP 02292626 A EP02292626 A EP 02292626A EP 1306481 B1 EP1306481 B1 EP 1306481B1
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EP
European Patent Office
Prior art keywords
moisture content
gain
drying
linen
ironed
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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
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EP02292626A
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English (en)
French (fr)
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EP1306481A1 (de
Inventor
Andre Maziere
Arnaud Viger
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Electrolux Laundry Systems France SNC
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Electrolux Systemes de Blanchisserie SNC
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F67/00—Details of ironing machines provided for in groups D06F61/00, D06F63/00, or D06F65/00

Definitions

  • the invention relates primarily to a method of controlling the moisture content of ironed clothes leaving a dryer ironer.
  • the invention also relates to a ironing dryer using this method, that is to say a dryer ironing integrating means able to maintain the moisture content of the ironed iron to a set value.
  • a dryer ironing integrating means able to maintain the moisture content of the ironed iron to a set value.
  • the clothes to be ironed are introduced between a rotating ironing cylinder and a complementary member which matches the shape of a portion of the circumference of the cylinder.
  • Heating means ensure the vaporization of the water contained in the laundry pressed between these organs.
  • Ironing dryers can be divided into two categories: ironing dryers “calender” and “heated cylinder” ironers.
  • the rotating ironing cylinder is lined and internally provided with means for recovering the vapor and gases released by the laundry.
  • the pieces of laundry then circulate between the lining carried by the cylinder and a metal bowl called "calender".
  • the heating means are generally integrated in this metal bowl.
  • the heating means are placed inside the metal cylinder, whose outer surface is smooth and in direct contact with the laundry.
  • the pieces of laundry then circulate between the cylinder and endless textile webs which are pressed against the outer surface of the cylinder over part of its circumference.
  • Suction means are provided behind the endless belts to recover vapors and gases.
  • the moisture content of the ironed iron coming out of the machine depends on many factors such as the nature of the textile, its moisture content when it is introduced into the machine, its speed scrolling inside the machine, the heating temperature of the laundry, etc.
  • ironing linen comes, for example, from hospitals, it may contain bacteria. These bacteria will then grow all the faster as the moisture content of the dried and ironed laundry will be high. To guarantee a good microbial quality of laundry leaving a dryer ironer, so it is highly desirable that its moisture content as low as possible.
  • the document DE-A-34 36 553 describes a ironing dryer in which the pieces of laundry circulate between a plurality of calender cylinder sets placed in series. Each of the cylinders is rotated at an adjustable speed and includes steam suction means having an opening throttle valve adjustable. At the output of the machine, the laundry items are deposited on a metal plate and their residual moisture content, between said plate and a point contact member, is measured by means of a resistance bridge. The humidity level thus measured is compared with an adjustable set point.
  • the throttle valve of the suction means of the first calender cylinder assembly in the direction of the scrolling of the laundry, is opened one by one, and that of the means suction of the second calender cylinder assembly and so on, until the desired moisture content. If the humidity level is still too high after the complete opening of all the throttle valves, then the speed of rotation of all the cylinders is reduced.
  • the measured moisture content is lower than the set value, it closes the throttle valve of the last set of calender cylinder, in the direction of scroll of the laundry, then that of the penultimate and so on until the desired humidity level is reached. If the humidity measured remains below the set point after closing all the throttle valves, then the speed of rotation of all the cylinders is increased.
  • a first problem has its origin in the appearance of the curve illustrated in Figure 1 of the accompanying drawings, showing the variations of the equivalent electrical resistance (in Ohms) of a piece of laundry, depending on the moisture content that it contains. It can be seen from this curve that very small variations in this rate result in very large variations in the equivalent electrical resistance when the laundry is not very moist (moisture content below 6%). Conversely, when the laundry is very wet (moisture content above 15%), the equivalent electrical resistance of the laundry is almost constant. Under these conditions, it appears that it is not practically possible to control the moisture content of the laundry at the exit of the machine directly on the basis of a measurement made by a resistance bridge of invariable characteristics, such as teaches the document DE-A-34 36 553.
  • the subject of the invention is precisely a method for controlling the moisture content of pieces of laundry leaving a ironing dryer, making it possible at least in part to solve the problems of the ironing dryers of the prior art and in particular ensuring effective control of the ironing machine. Moisture content of the ironed laundry, even when this rate undergoes significant variations during the same ironing cycle.
  • this problem is solved by means of a method for controlling the moisture content of ironed clothes coming out of a ironing dryer, according to which the humidity level of the ironed clothes pieces is measured, then at least one element of the ironing dryer is controlled according to the measured humidity level, in order to move it to a set point, characterized in that the measured humidity level is amplified with an instantaneous optimized gain of such that the measured moisture content thus amplified has an unsaturated value, which is used to control said ironing dryer element.
  • the amplification gain is adjusted automatically according to the value of the measurement signal, to obtain an unsaturated output signal, which can then be used to correct the moisture content of the laundry that comes out. of the machine. A effective and virtually instantaneous adjustment of this rate is thus obtained regardless of the state of the laundry that is introduced into the ironing dryer.
  • the gain is initially given a maximum value, then the gain is divided by a given factor, as many times as necessary, until the measured and amplified moisture content has said unsaturated value.
  • the divisor factor is then given a value substantially equal to two.
  • the optimized instantaneous gain is advantageously kept unchanged for a period of time. predetermined time after the end of the measurement of the moisture content of the last piece of linen ironed previously. This characteristic makes it possible not to repeat the measurements using the maximum value of the gain when several pieces of laundry are ironed after each other.
  • the invention also relates to a dryer ironer comprising means for measuring the moisture content of ironed clothes leaving the ironing dryer, said measuring means being capable of delivering a measurement signal in the presence of a piece of laundry, and control means responsive to the measurement signal for modifying the humidity level by acting on at least one element of the ironing dryer, characterized in that the control means comprise means for amplifying, with variable gain, the measurement signal and automatic gain control means, able to give the gain of the amplification means an optimized value, such that the amplification means emit a unsaturated output signal.
  • the element on which the control means act is a means for adjusting the speed of travel of the clothes in the ironing dryer.
  • This adjustment means can in particular vary the speed of rotation of the ironing cylinder of the machine.
  • the means for measuring the moisture content comprise two electrically conductive members, each comprising at least two (preferably five) flexible tabs capable of being simultaneously in contact with the pieces of laundry leaving the ironing dryer, the flexible tongues. the two members being arranged alternately, so as to form as many elementary sensors as pairs arranged in parallel.
  • the machine further comprises means for measuring the moisture content of the clothes to be ironed entering the ironing dryer.
  • the machine further comprises means for recording the measurement signal, which provide maximum traceability to the ironed linen.
  • FIG. 2 very schematically shows a drying ironer with a heating roller equipped, in accordance with the invention, with means for controlling the moisture content of the pieces of ironed clothes coming out of this machine.
  • the invention is not limited to this type of machine and also relates to ironers with a calender.
  • FIG. 2 shows an ironing cylinder 10, of horizontal axis, means 12 (such as an electric motor) making it possible to drive the cylinder 10 in rotation. around its axis, at an adjustable speed, and endless textile belts 14, in contact with a portion of the circumference of the cylinder 10.
  • the endless textile belts are mounted on rollers such as 16, whose axes are parallel to that of the cylinder 10.
  • the clothes are ironed by introducing them between the cylinder 10 and the textile strips 14, in a direction corresponding to the direction of rotation of the cylinder 10 (arrow F).
  • the ironed and dried linen pieces leave the machine on a cylindrical and substantially horizontal portion 14a of the textile strips 14.
  • the ironing dryer illustrated schematically in FIG. 2 incorporates a device making it possible to control continuously the instantaneous moisture content of the clothes that come out of it, so that this rate is kept permanently at a set point, regardless of the moisture content of the clothes at the entrance of the machine.
  • the set value is chosen low enough to ensure good microbial quality of ironed linen, especially when it comes from a hospital.
  • the device for controlling the moisture content of the ironed articles comprises mainly means 18 for measuring this moisture content and control means for controlling the humidity. at least one ironing dryer element capable of modifying said rate.
  • the measuring means 18 are situated at the outlet of the ironing dryer, precisely above the cylindrical and substantially horizontal portion 14a of the textile strips 14, in the embodiment shown. They are designed to deliver a measurement signal representative of the moisture content of the ironed clothes that come out of the machine.
  • the measuring means 18 comprise two electrically conductive members 21 and 22, electrically insulated from one another by an insulating block 24.
  • the electrically conductive members 21 and 22 are metal plates. These plates comprise substantially planar base portions 21a and 22a, which are mounted on a fixed portion 26 of the machine, above the cylindrical portion 14a and substantially horizontal, so as to be substantially parallel to each other.
  • Each of the metal plates forming the electrically conductive members 21 and 22 also includes at least two flexible tabs 21b and 22b, which protrude from the base plates 21a and 22a.
  • the flexible tabs 21b and 22b are arranged parallel to each other and alternately, equidistant from each other. They have end portions folded in the same plane, tangential to the cylindrical portion 14a and substantially horizontal on which the ironed clothes pieces. Thus, the ironed clothes that come out of the machine are simultaneously in contact with all the end portions of the flexible tongues 21b and 22b.
  • each of the metal plates forming the electrically conductive members 21 and 22 comprises five flexible tabs 21b and 22b.
  • the arrangement of the measuring means 18 which has just been described amounts to forming at least two and, preferably, five humidity sensors arranged in parallel.
  • the sensitivity of the measuring means is thus given a relatively low value, well suited to the measurement of the very low humidity levels generally found at the outlet of the ironers.
  • electrical conductors 28 connect the two electrically conductive members 21 and 22 of the measuring means 18 to the means 20. These electrical conductors 28 convey an electrical measurement signal, representative of the electrical resistance between the electrically conductive members 21 and 22 and, therefore, the moisture content present in a piece of laundry possibly in contact with the tongues. 21b and 22b.
  • control means 20 comprise amplification means 30, with variable gain, of the measurement signal coming from the measuring means 18.
  • control means 20 also comprise means 32 for automatically adjusting the gain of the amplification means 30.
  • These automatic gain adjusting means 32 are arranged to automatically give the gain amplification means 30. an optimized instantaneous value, such that the output signal emitted by the amplification means 30 is unsaturated, irrespective of the humidity level of the pieces of laundry coming out of the machine.
  • the automatic gain control means 32 determine at each instant an optimized instantaneous gain for which the output signal delivered by the amplification means always has a usable value, that is to say distinct from the saturation limits for which changes in the moisture content of the laundry do not vary the signal coming out of the amplification means.
  • the control means 20 thus deliver, at the output of the amplification means 30, a signal which is permanently the image of the humidity contained in the pieces of laundry coming out of the machine, whatever the value of this humidity.
  • the automatic gain control means 32 may include an algorithm that calculates the optimized instantaneous gain from the measurement signal delivered by the measuring means 18.
  • the automatic gain adjustment means initially give the gain of the amplification means 30 its maximum value.
  • this gain value is taken as the optimized instantaneous value and is maintained as long as the output signal remains unsaturated.
  • the automatic gain adjustment means 32 divide the maximum value of the gain by a predetermined factor, for example substantially equal to two in the preferred embodiment of FIG. the invention.
  • the unsaturated output signal thus obtained according to the invention is then compared in 33 to a moisture content recorded and used to control one or more elements of the ironer dryer capable of modifying said rate.
  • this element is constituted by the means 12 for rotating the cylinder 10. More specifically, the drive means 12 are then actuated so as to modify the speed of advance of the pieces of laundry in the machine. This modification has the effect of bringing very quickly to the desired value the moisture content of the piece of laundry coming out of the machine.
  • the measurement signal before being injected into the amplification means 30, the measurement signal preferably undergoes a smoothing operation in a smoothing circuit 34 and an averaging operation in an averaging circuit 36.
  • the measurement signal that is transmitted to the amplification means 30 does not take into account possible erratic measurements and represents the average of a determined number of consecutive measurements.
  • the algorithm of the automatic gain control means 32 is designed so as to avoid systematically restarting the amplification with a maximum value gain when several pieces of laundry. the same batch, having substantially the same moisture content, are ironed continuously after each other.
  • the algorithm maintains unchanged the last value of the instantaneous gain optimized for a predetermined period of time, after the end of the previous measurement signal indicating the presence of a piece of laundry on the portion 14a.
  • the ironing dryer according to the invention is also equipped with means 38 for measuring the moisture content of the clothes to be ironed which are introduced into the ironing dryer ( Figure 2).
  • These measuring means 38 can be made in the same manner as the measuring means 18 described above. They are mounted on another fixed part 40, above another cylindrical portion 14b and substantially horizontal endless belts 14, located where the textile parts are introduced into the machine.
  • the signal delivered by the measuring means 38 is also transmitted to the automatic gain control means 32 (FIG. 4). It can in particular be used to detect the introduction of a piece of laundry in the ironing dryer.
  • the measurement signal delivered by the measuring means 18 placed at the output of the machine is advantageously recorded in recording means 42, with other information notably enabling identify the ironed clothes.
  • This arrangement makes it possible to ensure the traceability of the operations carried out on the machine and more precisely to guarantee the good microbial quality of the ironed linen.
  • the invention is not limited to the embodiment which has just been described by way of example.
  • the algorithm for automatically adjusting the gain of the amplification means 30 to the optimum instantaneous value may be substantially different from that which has been described.
  • This algorithm can in particular initially give the gain its lowest value or a pre-established average value.
  • the humidity measurement means may in certain cases be replaced by existing means, without departing from the scope of the invention.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Drying Of Solid Materials (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Control Of Non-Electrical Variables (AREA)

Claims (12)

  1. Verfahren zum Steuern des Feuchtigkeitsgrads von gebügelten Wäschestücken, die aus einer Trocknungs- und Bügelmaschine kommen, wobei der Feuchtigkeitsgrad der gebügelten Wäschestücke gemessen wird und anschließend mindestens ein Element (12) der Trocknungs-Bügelmaschine gemäß dem gemessenen Feuchtigkeitsgrad gesteuert wird, um dieses auf einen Sollwert hin zu verschieben, dadurch gekennzeichnet, dass der gemessene Feuchtigkeitsgrad mit einer augenblicklichen optimierten Verstärkung verstärkt wird, so dass der so verstärkte gemessene Feuchtigkeitsgrad einen nicht-gesättigten Wert darstellt, der zur Steuerung des Elements (12) der Trocknungs-Bügelmaschine verwendet wird.
  2. Verfahren nach Anspruch 1, wobei anfänglich der Verstärkung ein Maximalwert gegeben wird und anschließend die Verstärkung durch einen gegebenen Faktor so oft wie nötig geteilt wird, bis der gemessene und verstärkte Feuchtigkeitsgrad den nicht-gesättigten Wert aufweist.
  3. Verfahren nach einem der Ansprüche 1 oder 2, wobei bei Nichtvorhandensein einer Messung bzw. eines Messwerts des Feuchtigkeitsgrads eines gebügelten Wäschestücks die augenblickliche optimierte Verstärkung während eines vorbestimmten Zeitraums nach dem Ende der Messung des Feuchtigkeitsgrads eines letzten gebügelten Wäschestücks unverändert beibehalten wird.
  4. Verfahren nach einem der Ansprüche 1 bis 3, wobei nacheinander mehrere Messungen des Feuchtigkeitsgrads vorgenommen werden, die Messsignale geglättet werden und deren Durchschnitt berechnet wird, bevor sie mit der augenblicklichen optimierten Verstärkung verstärkt werden.
  5. Trocknungs-Bügelmaschine, umfassend Mittel (18) zum Messen des Feuchtigkeitsgrads von aus der Trocknungs-Bügelmaschine kommenden gebügelten Wäschestücken, wobei die Messmittel (18) ein Messsignal bei Vorhandensein eines Wäschestücks liefern können, sowie auf das Messsignal ansprechende Steuermittel (20) zum Modifizieren des Feuchtigkeitsgrads, indem auf mindestens ein Element (12) der Trocknungs-Bügelmaschine eingewirkt wird, dadurch gekennzeichnet, dass die Steuermittel (20) Verstärkungsmittel (30) mit variabler Verstärkung des Messsignals sowie Mittel (32) zur automatischen Regelung der Verstärkung aufweisen, welche der Verstärkung der Verstärkungsmittel (30) einen optimierten Wert vermitteln können, so dass die Verstärkungsmittel (30) ein nicht-gesättigtes Ausgangssignal aussenden.
  6. Trocknungs-Bügelmaschine nach Anspruch 5, wobei die Mittel (32) zur automatischen Regelung anfänglich der Verstärkung einen Maximalwert geben, und anschließend die Verstärkung durch einen gegebenen Faktor so oft wie nötig bis zum Erhalt des optimierten Wertes teilen.
  7. Trocknungs-Bügelmaschine nach einem der Ansprüche 5 oder 6, wobei bei Abwesenheit des Messsignals die Mittel (32) zur automatischen Regelung die Verstärkung während eines vorbestimmten Zeitraums nach Ende eines letzten Messsignals auf dem optimierten Wert halten.
  8. Trocknungs-Bügelmaschine nach einem der Ansprüche 5 bis 7, wobei die Steuermittel (30) Glättungsmittel (34) sowie Durchschnittsermittlungsmittel (36) umfassen.
  9. Trocknungs-Bügelmaschine nach einem der Ansprüche 5 bis 8, wobei das Element, auf das die Steuermittel (20) einwirken, ein Mittel (12) zur Regelung der Durchlaufgeschwindigkeit der Wäschestücke in der Trocknungs-Bügelmaschine ist.
  10. Trocknungs-Bügelmaschine nach einem der Ansprüche 5 bis 9, wobei die Messmittel (18) des Feuchtigkeitsgrads zwei elektrisch leitende Organe (21,22) umfassen, die jeweils mindestens zwei nachgiebige bzw. elastische Zungen bzw. Lappen (21b,22b) aufweisen, die gleichzeitig in Kontakt mit den aus der Trocknungs-Bügelmaschine kommenden Wäschestücken sein können, wobei die elastischen Zungen bzw. Lappen (21b,22b) der beiden Organe auf alternierende Weise angeordnet sind, so dass sie so viele elementare Messfühler wie parallel angeordnete Paare bilden.
  11. Trocknungs-Bügelmaschine nach einem der Ansprüche 5 bis 10, außerdem mit Messmitteln (38) des Feuchtigkeitsgrads von zu bügelnden Wäschestücken, die in die Trocknungs-Bügelmaschine eintreten.
  12. Trocknungs-Bügelmaschine nach einem der Ansprüche 5 bis 11, außerdem mit Aufzeichnungsmitteln (42) des Messsignals.
EP02292626A 2001-10-25 2002-10-23 Verfahren zum Regulieren der Feuchtigkeit von Wäsche , beim Verlassen einer Trocknungs- und Bügelmaschine und Maschine zur Verwendung dieses Verfahrens Expired - Lifetime EP1306481B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0113794 2001-10-25
FR0113794A FR2831562B1 (fr) 2001-10-25 2001-10-25 Procede de controle du taux d'humidite du linge sortant d'une secheuse repasseuse et secheuse repasseuse mettant en oeuvre ce procede

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EP1306481A1 EP1306481A1 (de) 2003-05-02
EP1306481B1 true EP1306481B1 (de) 2006-05-10

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EP02292626A Expired - Lifetime EP1306481B1 (de) 2001-10-25 2002-10-23 Verfahren zum Regulieren der Feuchtigkeit von Wäsche , beim Verlassen einer Trocknungs- und Bügelmaschine und Maschine zur Verwendung dieses Verfahrens

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US (1) US6889453B2 (de)
EP (1) EP1306481B1 (de)
AT (1) ATE325916T1 (de)
DE (1) DE60211271T2 (de)
DK (1) DK1306481T3 (de)
ES (1) ES2264469T3 (de)
FR (1) FR2831562B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10225084B4 (de) * 2002-06-05 2007-11-15 Johnson Controls Gmbh Verfahren zur Behandlung von Bezugsmaterialien von Innenausstattungsteilen, insbesondere für Kraftfahrzeuge, und Innenausstattungsteil

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2219895A1 (de) * 1972-04-19 1973-10-31 Grosswaescherei Robert Raatz I Ueberwachungs-und steuervorrichtung fuer waeschemangelmaschinen
US4197663A (en) * 1978-09-21 1980-04-15 Firma Drabert Sohne Apparatus for continuous pressing and steaming of fabric
DE3436553A1 (de) * 1984-10-05 1986-04-10 Elasto-Press Schmitz GmbH, 3250 Hameln Waeschemangel
DE3535458C1 (de) * 1985-10-04 1987-01-08 Kleinewefers Textilmaschinen G Verfahren zum Regeln der Feuchtigkeit einer textilen Warenbahn oder dgl.durch Abquetschen und Vorrichtung zur Durchfuehrung dieses Verfahrens
US5244518A (en) * 1990-11-02 1993-09-14 Stickle Steam Specialties Co. Inc. Corrugated board manufacturing apparatus and process including precise web moisture and temperature control
US5671633A (en) * 1996-02-12 1997-09-30 Wagner Electronic Products, Inc. Plate array for moisture sensor with reduced sensitivity to loading effects
FR2800398B1 (fr) * 1999-10-05 2002-03-08 Danube Internat Secheuse-repasseuse equipee d'un dispositif de regulation en fonction de la temperature et de l'humidite
US6784673B2 (en) * 2002-09-13 2004-08-31 Whirlpool Corporation Condition sensor for a dryer

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US20030079380A1 (en) 2003-05-01
FR2831562B1 (fr) 2004-01-30
DE60211271T2 (de) 2007-04-26
FR2831562A1 (fr) 2003-05-02
ES2264469T3 (es) 2007-01-01
ATE325916T1 (de) 2006-06-15
US6889453B2 (en) 2005-05-10
DE60211271D1 (de) 2006-06-14
EP1306481A1 (de) 2003-05-02
DK1306481T3 (da) 2006-08-21

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