DE1460933A1 - Automatic machine for drying fabrics - Google Patents

Description

Automatic machine for drying fabrics.

The invention relates to an automatic machine for drying fabrics and in particular to an improved device in such machines which determines when the fabrics in the machine are completely dry and accordingly completes further drying processes in the machine,

Many commercially available machines for drying fabrics are equipped with devices which allow a drying process close automatically when the laundry is completely dry. This is in contrast to the older technology, where the operator estimates the drying time of the laundry and adjusts a timer accordingly. Although various devices have been developed to determine when the laundry is dry and the machine switched off, there is a great difficulty with all of these devices in achieving high sensitivity and accuracy as the laundry approaches dryness, so that the machine works precisely and is dried neither too much nor too little.

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The invention is therefore based on the object of a improved control device for a machine for drying of fabric that automatically completes the drying process, if essentially all of it Moisture has been removed from the fabric in the machine »

This is achieved by means of high frequency electrical waves that are emitted into the container containing the tissue.

The wavelength of the high-frequency waves is matched to the dimensions of the laundry container so that the container reflects a predetermined part of the emitted waves when the clothes reach the desired degree of dryness.

According to one aspect of the invention there is provided a machine for drying fabric which, in a known manner, comprises a contains essentially closed laundry container made of conductive material. This can be, for example, a Act rotating tub or a rotating drum made of sheet metal. Appropriate means are provided to keep the fabric in the drum to dry. These can be of any type; ge—

co cozy, the fabric is heated in the drum to make the ο

to evaporate moisture, and the evaporated moisture co

T ^ is then discharged. In the machine according to the invention are ο still means to generate an electrical current lio- ** 'her' frequency provided, and this generator comes with a coupled to a suitable construction, which is located in such a way that

that they emit high frequency electromagnetic waves into the container sends out.

This container is tuned to the frequency of the waves in such a way that the reflection of the waves from the container changes according to a certain pattern when the moisture in the tissue in the container decreases to a dry state. In other words, because of the absorption and reflection of energy by the tissue moisture, wet fabrics transform the pattern of wave reflection from that which occurs when all of the energy reflection is through the container. As the fabric becomes dry, the change in the wave pattern becomes smaller and smaller and closer and closer to the pattern that occurs during dryness as the moisture content of the fabric decreases. It is a measuring device provided for determining the reflection pattern of the emitted waves, and when the measuring means determines that the wave reflection for a specific (pattern is going on, it provides for the switching off of the drying means, to complete the drying process in the machine. With With this device, the drying process is completed automatically, depending on the humidity in the drum and regardless of the type of fabric, whether or not it matters

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the moisture sits deep in the tissue or on the surface of the tissue. :

The subject of the invention is in particular at the conclusion of the description compiled and claimed. However, the invention is both as to its construction and with regard to the type of embodiment and further features and advantages, this is best done with reference to the following description to be understood in connection with the accompanying drawings.

In the drawings show:

Fig. 1 is a side view of a clothes dryer with the improved control device for the moisture according to the invention, the machine partially broken open and is shown partially in section to show details;

^ψ Figure 2 is a schematic depiction of the improved control system, which is used in the machine of Fig. 1.

FIG. 3 is a graph of test results obtained in a Machine of the type shown in Figs. 1 and 2 for different Types of laundry fillings obtained;

4 is another graph of test results obtained in a machine of the type shown in FIGS. 1 and 2 for a typical laundry filling was obtained;

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Pig. 5 is a partial side view of a clothes dryer of the Pig. 1 according to a second embodiment the improved drought control device;

6 is a partial side view of a clothes dryer of the type shown in Fig. 1 according to a third embodiment of the invention and

7 shows a partial side view of the front part of a clothes dryer of the type shown in FIG. 1 according to a fourth embodiment of the invention.

Reference is now made to FIG. There, a home laundry dryer 1 is shown, which has a rotating container or a drum 2 for laundry and is housed in a suitable outer housing or jacket 2, by which the drum is enclosed on all sides. The drum is rotatably mounted in the housing 3 on an essentially horizontal axis and is essentially cylindrical. It has a first outer wall part 4, second and third cylindrical wall parts 5 and 6, which are each located at the ends of the drum, a rear wall 7 and a front wall 8. The drum is made of sheet metal. The wall parts 4, 5 and 6 are made of non-perforated sheet metal over their entire length, so that the entire outer shell of the basket is unperforated} on the inner surface of the central part 4 several rolling ribs 9 are provided for the laundry, so that the basket Laundry "takes up when walking around and then falls down ISBt _f

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- 6 so that the presented areas of the tissue change continuously. The ribs 9 in this particular embodiment are preferably made of non-conductive material, although one Suitable construction and various components have been found that make it possible to also make a drum with ribs conductive material to be used.

The front part of the drum 2 is rotatably supported in the outer housing 3 by means of a pair of idle roller wheels. One of these rolling wheels is shown at 10. The roller wheels are rotatable at the upper end of an upwardly standing part 11 stored. The part 11 is fastened at the bottom of the base 12 of the machine. The should 10 sit below on each side the drum in contact with the part 6. The rear end of the drum is carried by a rolling wheel 13 which is located under the Part 5 of the drum is and drives the drum with friction. .

The roller 13 sits on a shaft 14- which are in store 15 is worn. The shaft 14 is connected to a pulley 16 which is driven by a belt 17, the in turn receives its drive from a pulley 18 which is seated on the end of a shaft 19 of an electric motor 20. The motor, the pulleys and the roller 13 are so tuned to the drum 2 and to each other that the drum 2 through the roller 13 is driven at a suitable speed to circulate the laundry items in the drum.

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So that a stream of drying air can be introduced into the laundry drum and passed through it, the Drum in its "front wall 8 has a central recess 21 and several openings 22 which are arranged on a ring in the rear wall 7. On the rear wall 23 of the housing 3 is with suitable means, for example by spot welds 24, a baffle 25 rigidly attached to the heating elements, such as an electrical heating element 26, with the interposition of a

appropriate insulation are attached. The heating elements can be ring-shaped so that they are essentially exactly the same as the openings 22 and the drum 2. On the rear wall 7 of the drum is outside the ring formed by the perforations 22 and inside the stationary baffle 25 Baffle 27 rigidly attached so that the two baffles 25 and 25 together form an annular air inlet 23. The storage wall 27 also has an annular row of spaced apart Openings 29. In this way a flow path is created for the air so that it can flow through the annular space ( enter between the baffles, then stroke over the heating elements 26 and through the openings 29 and the perforations 22 can enter through the interior of the drum 2.

In addition to their guiding function for the air, the Baffles 25 and 27 together with the rollers 10 and 13, the drum 2 is located on the middle part 30 of the baffle 27

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itself, a carrier 31, to which in turn a shaft journal 32 is fixed which is arranged substantially coaxially to the drum 2. In the middle part of the retaining wall 25 is a slot-like Formed opening 34. The slot is appropriately designed (described in greater detail in co-pending U.S. patent application) Ser.No. 789 869 dated January 29, 1959 by William P. Simpson, assigned to the assignee of this application) that ^ the shaft journals 32 move somewhat in the vertical direction can, but cannot move horizontally. In this way, the slight vertical movement of the drum, which when tumbling the laundry results are added, while at the same time an undesirable horizontal movement by engagement of the shaft journal 32 in the slot 34 is avoided.

The front opening 21 of the drum is closed off by a stationary, waterproof transverse wall 35. The waterproof Transverse wall 35 consists of several adjacent parts including 'the inner surface 36 of an access door 37 which is located in the housing of the Dryer is mounted, the fixed frame 38 of the door, the inner surface of an outlet conduit 14 and an annular Flange 41 attached to frame 38 and the wall of the conduit. You can see that between the inner edge of the Drum opening 21 and the edge of the waterproof transverse wall 35 'there is a suitable play, so that during rotation of the No rubbing between the drum and the waterproof drum

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Transverse wall occurs. About every noticeable leak of air to avoid through the opening 21 between the inside and the outside of the drum is a suitable sealing ring 42, preferably made of felt-like material, attached to the flange 41, so that it with the outer surface of the Drum wall 8 seals together.

Apart from the fact that the front opening 21 constitutes a part of the flow path of air through the drum, it also serves to fill the laundry into the drum and to remove therefrom the like. The door 37, the inner surface of which forms part of the watertight bulkhead closing the opening, is movably attached to the housing 3 in such a way that it can be shifted between a closed and an open position. When the door is open, the laundry can be carried be poured into or removed from the drum through the door frame. It will be seen that the door has an outer, flat, unperforated portion 43 and an inwardly extending hollow portion 44 attached to the outer, flat portion. The hollow portion 44 extends into the door frame 38 when the door is closed, and the door surface 36, which is part of the assembled watertight bulkhead 35, forms the inner wall of the hollow portion. The surface 36, which is preferably made of sheet metal, has a section 45 made of a dielectric material, which is in the

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is substantially rigid and can withstand the heat in the dryer.

One of the materials that can typically be used for this purpose is polypropylene. Immediately behind the plate made of dielectric material is a box-like part 46 made of sheet metal, which is completely closed on all sides except for the front, where it abuts the plate 45. DJeser Part 46 located in the door 37 forms an essential part of the invention and is described below in connection with the FIG Pig. 2 described the arrangement shown.

The air opening of the basket is formed by a perforated opening 47, which is in the inner wall 36 of the hollow Door section 44 is located. The lower wall section of the door section 44 and the adjacent wall of the door frame 38 have aligned openings 48 and 49, of which the opening 49 represents the entrance to the line 40. In the line 40 is at the entrance 49 preferably a lint closure 50, the one Can contain a fine network bag attached. The bag is carried by the door frame. The line 40 leads to a suitable Luftumwälζeinrichtung to which a centrifugal fan 51 belongs, which sits on the shaft of the motor 20 and is thus driven directly by this motor. The outlet of the

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Blower 49 opens into a suitable outlet duct (not shown) which is shaped in the usual manner so that it allows the air to exit the machine 1 out. During operation of the motor 20, when the fan 51 rotates, air is sucked into the machine housing 3 at the front of the machine through a suitable opening, for example as shown at 52. The air then passes through the annular opening 28, via the heating elements 26 through the openings 29 and perforations 22 into the drum 2 and then flows through the drum, through the M perforated opening 47 and the aligned openings 48 and 49 into the line 40 and from there through the fan 51 to the above-mentioned outlet duct.

At this point you can see that a conventional timer, which is indicated schematically in Fig. 2 by the number 53, and otherwise not shown, may be provided. The Zeitwerk 53 can be operated by means of a suitable hand control, as indicated at 54 in FIG To put motor 20 and heating elements 26 in operation so that Air is sucked into the machine via the heating elements and then enters the basket, where it heats and uses the laundry evaporation of the moisture in the laundry. The air is then expelled in the above-mentioned way, whereby it carries away the evaporated moisture *

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An important part of the invention is that in Pig. with the number 55 "designated circuit for generating a high-frequency output current. It's a relative typical circuit shown to achieve this purpose. It should be noted that the term "high frequency" in a non-teehni sense is used and both frequencies in the VHP range as well as UHF range, recorded. These areas are technically defined as follows: VTP is equal to 30 up to 300 megahertz and IJHP is equal to 300 to 3000 megahertz. The circuit includes a suitable transistor 56 with a base 57, an emitter 58 and a collector 59. Between A feedback capacitor 60 is switched on for emitter and collector, so that a capacitive feedback is created from the collector to the emitter. The collector 59 of the transistor is connected to a resonance circuit 61, to which one inductive loop, as well as a tuning capacitor 63 connected across the inductive loop. Power to the emitter can be from any source of direct current take place. In the present package, this is shown as a battery 63a for the sake of simplicity. The circuit also contains suitable Drop resistors 64 and 65, a bias resistor and shunt capacitors 67 and 68, one side of which the ground 69 is connected.

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In the particular conventional circuit shown, it has been found that a model number 2N14O5 germanium mesa transistor from Texas Instruments, Inc. can be used for transistor 56, in conjunction with a 12-Vlt- (Direct current source in the form of the battery 63a. In this circuit are suitable values for the resistors 64, 65 and 66 '. 1000 ohms, 2000 ohms and 10,000 ohms. The two shunt capacitors 61 and 68 can be in the order of magnitude of 100 pico-farads and the feedback capacitor 60 is on the order of 1 pico-farad. The tuning capacitor 63 can be varied between 1 and 10 pico-farads to provide output frequencies on the order of 250 megahertz to 1000 megahertz.

The generator circuit 55 described above may be coupled to a suitable transmission line member 70 by any suitable means. In the present case, the coupling takes place by means of a tap 71 to the loop 62. It should be noted, however, that other _e Ankupplungen, for example, inductive or capacitive, usable.

Extends through a small opening 76 in the sheet metal part 46 a needle part 75 of the component 70 downwards. The box 46 is shaped so that its rear surface 77 is as accurate

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stands away from the needle by 1/4 wavelength as much as possible. It is well known that the wavelength \ is found simply by dividing the speed of light by the frequency f, that is, by means of the formula

^ -. Meter / second. From this formula it can be seen that at frequencies below 900 megahertz the wavelength is greater than 33 cm, and with the construction shown the door is normally not thick enough to give the distance A

4 As can be seen in Fig. 1, the needle 75 is for this reason placed as far forward as possible in the direction of the plate 45, so that between the needle 75 and the rear wall 77 of the Part 46, the greatest possible distance remains »With this type of construction, part 46 actually forms a guide for the Waves emitted from the needle 75 and propagated into the drum 2. The side walls 78 of the wave guide are preferably each at least 1/4 wavelength away from the downwardly protruding needle 75. That happens to avoid excessive attenuation of electromagnetic wave radiation from needle 75.

The device described so far in connection with FIG. 2 serves the purpose of generating energy in the form of high frequencies to radiate electromagnetic waves from the needle 75 and to guide them through the shaft guide 46 into the drum 2,

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Forms a cavity in the sense of the lükrowelle technology, d. H. a dielectric area of arbitrary shape completely enclosed by conductive walls *. In this In connection with this, it should be noted that the narrow 'openings in of the drum 2 are provided in order to allow air to be circulated into and out of the drum, are neglected can be achieved if the drum is viewed as a tree "completely enclosed by conductive walls".

When a cavity is excited by electromagnetic waves whose length is short compared to the dimensions of the cavity, results in the vicinity of many frequencies because of the Reflections from the walls of the cavity resonate, bas leads to the fact that standing waves are generated in the electromagnetic fields inside the cavity · But there also occur standing waves of current and voltage in the "transmission line that feeds the cavity resonator (or needle).

This resonance effect occurs when the room is inside of the drum 2 entirely of dielectric material with substantially little loss, for example air or dry tissues is filled. However, when wet fabrics are circulated in the drum 2, they form a bad one Isolator, i.e. they are lossy and not highly

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grade dielectric. The presence of wet tissue therefore leads to an absorption and reflection of a large part of the emitted energy by the water. When this happens, the waves are not reflected off the surfaces of the drum in order to have the anticipated effect on the transmitted waves. In other words, the presence of. wet tissue in the cavity leads to a considerable change in the reflection effect of the emitted waves compared to the effect which would normally be expected from the reflected waves. f ¹ ; ..,

From the foregoing it follows that it is by definition the wave reflection for dry clothes in drum 2 only it is necessary to create suitable means which, when this reflection pattern occurs, terminates the drying process bring about. While this can be done in a number of ways, preference is given to the fluctuations of the standing Voltage wave in the transmission line 7O "which the Generator circuit 55 coupled to needle 75, measured. This can be done by connecting a crystal diode 79 to the part 70 at a suitable place to be determined by experiment. Then a signal is passed through diode 79 to an amplifier. This can be of conventional construction and is therefore only indicated by the box 80. The amplifier 80 has a pair of output terminals 80 and 81 to which the relay coil 83 is connected.

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connected. When the signal emitted by the rectifier 79 reaches a certain level, the relay 83 is energized, closes its associated switch 84 and so energizes the timer motor 53 mentioned above is that ;, <$ ie washing is kntfcheiatroöken or he scarcely for a AbMthlUingsperiode provide _r wihrend which the engine is operating and which are case-z.elemente off. These are problems known to automatic drying machines, which need no further description. Ia-IIo the system is suitable "Sensitivity and time delay," the "beatiianite reflectioiistfflittstery which indicates the drying of the ash" can conclude ; bring about the heating gate unÄittelhar without the machine 1 continuing to work in any way.

When using an inlage built in accordance with the above description, an aüsgezE @ ie & iiete lomtrolle der drought reach, whereby «stpesiQeüf & ll 195» 375, 500 * T 915 legaheyt ^ m $ @ wm &&% wtsrden ** Äese fre ^ uenzen place » typical ancillary values represent * ö ^ wphl the finding constantly ffiiöirt ttof. äiese i ^ et is covered by% @a and higher a-ls also lower Preq.uerizen · in certain cases'

f #

In order to show an example of the invention in advance, the GräpMsohön presentation of FIG. 3 are the results of

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Drying of various laundry loads in a drum with an 18 inch diameter and a diameter of 25 l / 4 inch is shown. Signal emitted at a frequency of 915 megahertz, and was used a suitable means, "the degree or the amount of reflection to measure the signal · The curve A is for a 1.6 kg Killung with synthetic fabrics, the curve B for a 2.7 kg fabric filling made from pieces of thin cotton fabric of equal size, curve C for a 2.7 kg standard AHIiMÄ ^ billung (a mixed filling of cotton items including a sheet, towels, shirts, etc., as in the household Typically occurs), and curve for a 1.6 kg bath mat filling. It can be seen that for the three fillings that were completely dried (curves A, B and D) - the bone dry condition was indicated by exactly the same percentage of reflection , and that for a lower percentage of reflection there is a certain moisture (curve) Tissue is about QQ & , so control means can be provided in order to either dryness or any desired, limited degree of greasiness on the egg of a work place. obtain. ·. , _; ,.,

. lach dlie fig * 4 tffigi mm fe ^ stäüiiöis of you shows VerguöhaeigebMöÄt that barks ^^

a 2.7 kg AHIMA filling in a drum with the above dimensions and again with a field of 915 megahertz were achieved. As has been stated is it is not necessary to use the level of reflection as a criterion, as is the case with the experimental results illustrated in FIG. 3 was the case. Other reflection patterns can also be measured. In Fig. 4 it is the size the standing wave, which shows the voltage fluctuation during the rotation of the drum, knowing that the size of the Fluctuations go down to a predetermined level when the laundry is dry. Such a measurement is easily made with the connections shown in FIGS. 1 and 2 and also gives an exact picture of the drying condition of the laundry. It can be seen that there are two separate functions along the ordinate are recorded; the abscissa shows the time in minutes, while along the ordinate both (1 «) the water retention by the tissue and (2.) the height curve of the standing stress wave are plotted.

- One can see that the voltage fluctuation remains at a high level as long as there is still a lot of liquid retained in the laundry. Then, when the retained fluid sinks to 15 $ , the decrease in the fluctuation in tension also begins, and this decrease continues until

from 5 $> err, ei ₀ ivfe becomes. When the laundry

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approaching the dry state, the sensitivity increases the order of the one that was present in the laundry when a lot of water was present. In other words, stay so the fluctuations over the wide area where the laundry is very wet, constant, but they drop sharply when the. dry state is reached, so that in the field of dry Condition and low! Humidity there is a high sensitivity. This is for a facility that reduces the! Humidity measure of tissues and switch off a machine depending on this, very desirable.

While it has been shown that the amount of reflection in the Drum and the size of the standing tension wave are two useful ones Give images of reflection that can be measured it should be noted that the invention uses any conventional means for measuring the pattern of the standing waves or the Change in energy demand includes. Instead of the standing voltage wave in the transmission line, as in this Pail can also measure the ratio of input power and output power or the size of the power consumption of the generator serve as an indication of the degree to which the Waves instead of being reflected by the drum walls have been absorbed and reflected by the water. So you could ' also measure the power consumption of the circle 55 and thereby obtain the information on the pattern of the wave reflection.

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Another option is to change the impedance of the dry Adjust the laundry load so that there is little reflection when the laundry is dry and greater reflection when the laundry is wet In other words, a change is created in a broad sense that the water content of the flesh is close to the dry one State.

All of these or signs of phenomena can be used to generate a signal re-M can be reinforced in a way, that it can exert a control function. Of course, any desired wave generator can be used, and not just that shown in detail to illustrate the invention.

For those skilled in the art it is also clear that the needle can also be inserted into the cavity itself, and that it is not absolutely necessary to introduce the electromagnetic field in the manner described into the drum cavity by means of a needle which, together with a wave guide, sends out the Box in the cavity in the door of the machine. The arrangement of a needle in the cavity itself would the arrangement of a T _e iles such as the box or of the guide 46, which transmits the field in the cavity, unnecessary.

Accordingly, in FIG. 5, on an enlarged scale, is a Drum arrangement indicated, in which the back wall 7 of a typical

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Drum ^ as in Fig. 1, a. Has carrier 31, the The shaft journal 32 passes through the opening 34. In this In some cases, the shaft journal is hollow and has an opening 80 aie a needle 81 can pass through. The needle 81 is not in detailed manner in the same way as in Relationship with the arrangement according to FIGS. 1 and 2 is described has been coupled to a suitable generator circuit. When the ladel directly into the one formed by the drum Cavity protrudes, is a wave guide, which the electromagnetic Field aligned in the drum, not required.

Avoid practice to · "that the laundry is caught in the drum at the above Kadel, a cover 82 is provided of a dielectric material. This covers the needle 81 completely smooth er _s and the laundry can without any difficulty it slide along. When the Part 82 is made of a suitable dielectric material, the needle 81 is located in the cavity. (In the true sense of the word) of the drum, and the part 82 becomes just another factor to be considered when determining the height, wherein the used signal en drying process is allowed to come to completion.

Another device for emitting the field to excite the sound. The cavity formed in the drum is shown in FIG. 6

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shown. There the roller ribs 9 are made of plastic or non-conductive Material made with a conductive loop 83 in at least one of the ribs for energizing the cavity is arranged. In this case, however, a suitable slip ring arrangement would be desirable in order to supply the generator circuit with energy to feed. The details of such an arrangement result for the person skilled in the art without further ado.

m Fig. 7 shows a further embodiment, which there very ^

suitable where the door of the dryer is of limited thickness. In In this arrangement, the needle 84 is in a smooth one Cover 85 of dielectric material attached to the inner surface of the door. This arrangement is very similar to that in connection with Fig. 5 described by a straight, stationary needle provides the necessary excitation in the cavity to accomplish the measurement of dryness.

From the foregoing it can be seen that the invention is a g Has created a control system for a drying machine in which the degree of drying of the fabric in the container is immediate is measured by means of the change in the dielectric and energy absorption properties of the fabric as it dries.

In the above description, the preferred one

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Embodiment of the invention has been described. 3? For the It will be apparent to those skilled in the art that many changes and modifications can be made, including those detailed above. mentioned, but without limitation. You need to not to deviate from the invention. The scope of the invention will include all such modifications that appear in be made to their senses.

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Claims (1)

EIiECTRIC COMPANY
Schenectady 5 »NY
Siver Road 1,
V. St. A. T- Patent application; "Automatic machine for drying fabrics, ^tt PATENT CLAIMS U Machine for drying tissue with an essentially closed container made of conductive material for the tissue and means located in the container for drying the tissue »characterized by a generator (55) for an electric current of high reliability» means coupled to the generator ( 75, 81, 83, 84} »which are located so that they emit electromagnetic waves of said high frequency into the vessel (2), means (79) for measuring the extent to which the emitted waves are reflected from the container. The container is tuned to the high frequencies so that the reflection of the waves changes in a certain pattern when the amount of moisture in the tissue in the container decreases until the tissue is completely frozen, and by using && n measuring means associated means (83-84) "responsive to the particular reflection pattern to reduce the 909818/0444 turn off solvent. 2. Machine nacii claim 1, characterized in that a conductive needle is coupled to the generator and protrudes into the container, the measuring means also being coupled to the needle are so that the standing waves are measured in the needle will. W 3 · Machine for drying tissue - with an essentially closed container made of conductive material - for the tissue and means for drying the tissue in the container, characterized in that a generator is provided for generating an electrical current of high frequency that at least a t _e il of the container as a waveguide for electromagnetic waves from said high! frequency is formed, that in the generator means for emitting electromagnetic waves from said high frequency through the wave guide | are provided in the container, that means for measuring the extent to which the waves emitted from the container reflektieri be _s are provided, wherein the container is adapted to the high ürequena so that the reflection of the waves will change to a certain pattern, if the amount of the thickness in the tissue in the container drops to the perfect thinness of the tissue, and that means are connected to the measuring means which respond to the predetermined reflection 909818/0444 U60933 it address sample »to switch off the desiccant. 4 · Machine according to claim 3 »characterized in that a metallic needle is coupled to the generator and extends into the shaft guide, the measuring means also are coupled to the needle to measure the standing waves in the oil needle and the wave guide. 5. Machine according to Anspreh 1, characterized in that the container is a substantially cylindrical, metallic one Drum is mounted rotatably about a non-vertical axis is so that the fabric is circulated in the drum. 6. Machine for drying tissue with a substantially closed container made of conductive material for the tissue, which has the shape of a substantially cylindrical, metallic Has drum, one end of which has an access opening and which is rotatably mounted about a non-perpendicular axis, a the housing surrounding the drum and a metallic door in the Housing which engages with the access opening of the drum to form an enclosed tree therewith, and with means for drying the tissue in the closed tree, characterized in that a generator for generating an electrical Current high! Frequency is provided that the door as a wave guide for electromagnetic waves from the said 909818/0444 Ζ » high frequency trained part that has with the generator Means for emitting electromagnetic waves from the aforesaid high frequency are coupled through the wave guide in the closed space that means are provided, to measure the extent to which the emitted waves are reflected by the enclosed space, the enclosed space Room is tuned to the high frequency in such a way that the reflection of the waves changes to a certain pattern, ^ when the amount of moisture in the tissue in the closed Space drops until the tissue is completely dry, and that means are connected to the measuring means which respond to the predetermined reflection pattern to turn off the desiccants. -7. Machine according to claim 1, characterized in that the means for drying the fabric include heating means (26) arranged to heat the fabric in the container and in that means are provided to evaporate the fabric from the Se-P To remove moisture, wherein the means responsive to the predetermined reflection pattern ensure that the drying means are switched off at a predetermined reflection level. 8. Machine according to claim 3, characterized in that ■ the Welienfiung (46) is essentially rectangular, and that 9098 18/0444 the coupled means contain a part (75) which extends through a wall of the wave guide extend into it. 9. Machine according to claim 8, characterized in that the means for measuring the extent to which the sent • Waves reflected will contain a diode (79) that does so is arranged to moderate the standing wave of the electromagnetic field in the container. 10. Machine according to claim 1, characterized by a timer which "when starting a predetermined operation the desiccant triggers and the process of desiccant then stops, where "depending on the timer is started by the predetermined reflection pattern. 11. Machine for drying fabrics with an essentially closed container made of conductive material for the tissue, which is a substantially cylindrical metal drum with an access opening at the open and around a not f vertical axis is rotatable, and with a surrounding the drum Housing and a metal door in the housing, which with the access opening comes together to create a fully enclosed Tree with it to form, with means for drying of the tissue in the enclosed space are arranged, thereby characterized in that a generator for generating an electrical 909818 / 04U ίο High frequency current is provided that with the generator ' Means are coupled that protrude into the closed space and electromagnetic waves of the said high sequence Send out into the hem that smooth means of a dielectric Material covering the coupled means in the enclosed space that means are provided to measure the extent in which the emitted waves are reflected from the enclosed space, the enclosed space on the high Frequency is tuned so that the reflection of the waves is changes to a predetermined pattern when the amount of ! moisture in the tissue in the closed space up to complete dryness of the tissue drops, and that means are connected to the measuring means, which on the predetermined Trigger yeast flow patterns to turn off the desiccants. 12. Machine according to claim 11, characterized in that the coupled means in the enclosed space by the protrude. 13. Machine according to claim 11, characterized in that the coupled means through into the enclosed space whose end opposite the door protrude. 14 · Machine according to claim 11, characterized in that that on the drum roller ribs for the laundry from one not 09818/0444 conductive. Material are formed, and that the coupled Means protrude into the drum in at least one of the ribs, 909818/0444