EP3546625A1 - Feeding device of a carding machine - Google Patents

Abstract

The present invention relates to a method and a device for feeding fiber material (4) to a carding machine (1). The apparatus comprises a filling shaft (2), a filling shaft discharge (5), a feed channel (3) and a fan (18) for compressing the fiber material (4) in the feed channel (3) to a specific fiber wadding weight. The Füllschachtaustrag (5) has a via a frequency converter (23) driven feed roller (6) with a feed trough (25) for metering the fiber material (4) from the hopper (2) and an opening roller (7) for transferring the fiber material (4) from the feed roller (6) to the feed channel (3). A controller (31) is provided, in which a desired volume flow (V) of the fan (18) and a desired pressure (P) in the feed channel (3) are assigned for different fiber wadding weights each to a specific fiber wadding weight. In the feed channel (3) a pressure measurement (24) is provided.

Description

The present invention relates to a device for feeding of fiber material to a carding machine with a hopper, a Füllschachtaustrag, a feed channel and a fan for compacting the fiber material to a fiber wadding with a specific fiber wadding weight in the feed channel, and a method for controlling the fiber wadding weight.

The carding machine produces a card sliver from the fiber material which is subsequently processed into a yarn. Instead of a card sliver, however, it is also possible to produce a nonwoven. In this case, a card is usually associated with a hopper which is supplied by a conveyor system with fibers from a blowroom. The fibers are transported in the form of fiber flakes. The hopper is filled with fiber flakes from a transport system continuously or demand-controlled. In most cases, pneumatic transport systems are used. From the hopper, the fiber flakes are introduced by means of a feed device in the form of a fiber wadding in the card. In this case, the uniformity of the fiber wadding entering the card plays an important role with regard to the service life of the working elements of the card and the demands on carding quality. Also, the uniformity of the tape or web produced by the card is affected by the uniformity of the fiber wadding entering the card. Another important technological factor in the carding process is the weight of the fiber wadding entering the card. The size of the fiber wadding weight and the entry speed of the fiber wadding into the carding machine essentially determine the production quantity of a card and are jointly responsible for achieving a specific carding quality. The fiber wadding weight which can be processed by the carding machine is also determined by the product to be processed.

In the lower part of the hopper or in an alternative design in the lower part of the upper shaft with a feed trough working together feed roller for the continuous withdrawal of the fiber flock from the hopper is arranged. The extracted from the feed roller from the hopper fiber flakes are over a Opening roller for additional opening and homogenization fed to a feed channel. In the feed channel, the fiber flakes are formed by means of compressed air to form a homogeneous fiber wadding template, which is suitable for feeding the card. Also, a fan is provided in addition to the feed device, which allows an increase in pressure in the feed channel and thereby a compression of the fiber flakes to a fiber wadding. Due to the fan induced pressure in the feed channel, the fiber flakes are compressed to a fiber wadding. The air flowing into the feed channel through the fan is withdrawn via an air-permeable wall from the feed channel at its end and returned to the fan.

From the prior art is a supply of a card after the CH 693 419 A5 in which fiber flakes are discharged from a reserve shaft via a feed roller and an opening roller to a feed channel (feed shaft) of a card. In the feed shaft, the fiber mass is supplied with air flowing through. At the lower end of the feed duct air outlet openings are provided through which the air exits the feed duct. At the location of the air outlet openings of the cross section of the feed chute is made adjustable. A disadvantage of this design is that a uniform automatic regulation of the density of the fiber mass or the filling level in the feed chute is not possible.

Another type of filling shaft discloses, for example, the CH 706 658 A1 , This shows a two-part hopper consisting of an upper shaft and a lower shaft. The upper shaft is filled with fiber flakes, then the fiber flakes are passed from the upper shaft via a feed device to the lower shaft. From the lower shaft, the fiber flakes are discharged in the form of a fiber wadding and fed to the fiber wadding in the sequence via a feed channel of the card, with no devices are provided in the feed channel for influencing the fiber wadding. The feed channel is used only for transporting the fiber wadding from the lower shaft to the card. A disadvantage of this design is that a uniform automatic regulation of the density of the fiber mass or the filling level in the feed channel immediately before the transfer of the fiber wadding to the card is not possible. Object of the present invention is therefore to provide a feeding device with an automatic regulation of the compaction of the fiber wadding and the filling level in the feed channel and thus to achieve a feeding of the carding machine with a uniform fiber wadding.

Another object of the invention is to achieve a regulation of the level in the feed channel over the working width of the carding constant and uniform feeding of the fiber wadding to the card.

The objects are achieved by a feed device having the features of the independent claims.

Proposed is a device for feeding fiber material to a card with a hopper, a Füllschachtaustrag, a feed channel and a fan for compression of the fiber material in the feed channel to a specific fiber wadding weight. The filling duct discharge has a feed roller driven by a frequency converter with a feed trough for metering the fiber material out of the feed hopper and an opening roller for transferring the fiber material from the feed roll to the feed duct. A control is provided, in which a desired volume flow of the fan and a desired pressure in the feed channel are assigned for different fiber wadding weights each to a specific fiber wadding weight. In the feed channel a pressure measurement is provided. Since the uniformity of the fiber wadding entering the carding machine plays an important role, control of the fiber wadding properties at the end of the feed channel is decisive. The introduced by the fan in the feed channel air is discharged through an air-permitting part of the feed channel at the end of this. Now, if the feed channel is filled by the fiber material, the air introduced by the fan must pass through the fiber material to the air-permeable part at the end of the feed channel. The fiber material is compressed by the air. The higher the compression of the fiber material becomes, the more resistance the air flow experiences from the fan. The size of the compaction determines the fiber wadding weight of the fiber material compacted into a fiber wadding. This will be the fiber wadding weight determined by the inflowing air opposing resistance of the fiber material. For the fiber wadding weight to be achieved, the densification of the fiber material is decisive, which depends on the pending on the fiber mass pressure of the air introduced by the fan. Due to this dependence, a specification of the air flow to be introduced by the fan into the feed duct is provided with respect to its pressure.

By changing the filling level in the feed channel, the air is forced to flow through a larger mass of fiber material to reach the air-permeable wall of the feed channel. Thus, the level in the feed channel is significantly influenced by the air flow. By regulating the air volume flow, the filling level in the feed duct is determined accordingly.

In the carding various types of fibers and fiber blends are processed. These differ by their specific properties such as material (cotton, synthetic fibers, viscose, etc.) or fiber lengths (for example, short or medium stacks) or the proportions of different fibers in a fiber blend. Due to the fiber material to be processed, a production volume to be achieved and requirements for carding quality, a corresponding fiber wadding weight is determined for feeding the card. The determination of the fiber wadding weight of the fiber material to be fed takes place on the basis of operational experience of the spinning industry personnel. In the control system, setpoint values for the pressure in the feed duct and the volumetric flow of the fan are stored for the various fiber mat weights. The arranged in the feed channel pressure measurement allows compliance with the predetermined target pressure by controlling the speed of the feed roller and thus the amount of reaching into the feed channel fiber material. The filling level in the feed channel, however, is determined by influencing the volume flow.

With a change in the production quantity, for example, an increase in the production of the card, more fiber wadding is discharged from the feed channel into the card, resulting in a reduction of the level in the feed channel. This circumstance is normally compensated by direct control of the feed rate of the feed roll. If, despite the direct control, a reduction in the filling level, the resistance is reduced, which opposes the air from the fan and, consequently, the pressure in the feed channel is lowered below the desired pressure. The control responds by increasing the speed of the feed roller to restore the setpoint pressure.

Advantageously, a fiber wadding weight control is provided in the control. To control the fiber wadding weight, the controller determines an actual value of the fiber wadding weight. Determinations of the actual fiber wadding weight are known from the prior art, for example, describes the EP 2 867 392 A1 such a procedure. If a deviation now results between the predetermined desired fiber wadding weight, as a result of which the nominal values for volume flow and pressure of the fan have been assigned, and the actual fiber wadding weight, the setpoint values for the pressure are corrected while maintaining the setpoint value for the volumetric flow of the fan. This is due to the fact that a correction of the fiber wadding weight requires a change in the pressure in the feed channel. However, the filling height of the feed channel determined by the volume flow can be left.

In this case, the determination of the actual value of the fiber wadding weight is carried out by a calculation of a weight of the produced card sliver or fleece, a total delay of the card and a deposited leaving quantity. The individual fibers of the fiber material are parallelized in the card and leave the card in the form of a fleece or card sliver. In this process, the fiber wadding is pulled apart so that the produced card sliver leaves the carding machine at a higher discharge speed than the entry speed of the fiber wadding into the carding machine. This process is called delay. Such a delay occurs over several arranged in the carding rollers. The occurring individual delays from roller to roller can be added together in a so-called total delay of the card. Due to the operating state of a card whose total delay is known and is determined by the machine control itself. The total delay of a card corresponds to the ratio of the delivery speed of the card sliver or web to Infeed speed of the fiber wadding. By controlling the drives in the infeed and outfeed of the card, the machine control system determines the speed of the motors from the output values output to the corresponding motors and, correspondingly, the peripheral speeds of the rollers driven by the motors. Other means for determining the inlet velocity or the outlet velocity are, for example, speed measurements of the rollers or shafts. By cleaning and parallelization of the fiber material impurities and short fibers are excreted in the card from the fiber. The components taken from the fiber material are collectively referred to as the departure. The output quantity can be determined via an outgoing function depending on the production quantity. The determination of the outgoing function is usually carried out for a machine type and a fiber product to be processed once by an empirical measurement of the output quantity at different production ratios and different fiber material. The measurement of the band weight at the card runout takes place, for example, via the measurement of a disk roll spacing or radiometric measuring systems for the measurement of a nonwoven.

Preferably, the fan has a drive with a frequency converter for speed control. This allows the fan to be set directly to the new setpoints by the controller. Alternatively to a drive with a frequency control, a control gear or in a Lufteintritts- or an air outlet duct of the fan, a control element may be provided. The determination of a new setpoint for the speed is necessary to achieve a uniform distribution of the fiber material over the entire width of the feed channel. An uneven distribution of the fiber material leads to a non-uniform fiber wadding seen in the feed channel over the working width of the carding machine. The fiber wadding weight in this case would not be equal over the entire width of the carding machine by the creation of holes or tearing of the edges of the fiber wadding at the outer ends of the feed channel. This can also lead to a reduction of the possible production amount or upregulation of the fiber batting weight to an excessive fiber batt weight in the central region of the feed channel. The volume flow of the air in the feed channel has an influence on the filling level. An excessively high volume flow can be Due to the formation of exhaust ducts in the fiber wadding from the feed channel to the air-permeable region of the wall of the feed channel cause uneven compression of the fiber wadding.

Furthermore, it is advantageous if a sensor for measuring an opening of the feed trough is provided. The density or compactness of the fiber flakes taken from the feed chute through the feed roll also has an effect on the fiber wadding to be formed in the feed chute. At a high density, the air permeability of the fiber material is reduced and it is achieved with the same setpoint for the pressure of a lower filling level in the feed channel. However, a compensation of this phenomenon via the regulation of the pressure in the feed channel is not always satisfactory, since a sluggish control has too long a reaction time result and thus a short-term increase in the filling level, a blockage of the feed channel may result. With a high density of the fiber flakes in the hopper results from the removal of the fiber flakes with the feed roller an opening of the feed trough. The feed trough is resiliently held and is opened or closed by the fiber fluff according to need. By the sensor which detects the position of the feed trough a change in the density of the fiber flakes is noticed early and can be incorporated into the control of the speed of the feed roller accordingly. This makes it possible to reduce the supply when dense fiber flakes and to avoid clogging of the feed channel. The design of the sensor can be an embodiment of the feed trough or the movement of a distance sensor or a distance measurement (for example, inductive or capacitive mode of action) or a rotation angle sensor.

Conversely, if there is a reduction in the density of the fiber flakes, an increase in feed can be made by increasing the speed of the feed roller and there is no emptying of the feed channel by a shortage. By taking into account the density of the fiber flakes on the measurement of the opening of the feed trough a short construction of the feed channel is made possible. Furthermore, a device is proposed which allows a regulation of the filling level in the feed channel, regardless of the fiber wadding density. The device for feeding fiber material to a carding machine comprises a feed channel and a fan for compressing the fiber material in the feed channel to a specific fiber wadding weight. The fan has a drive with a frequency converter for speed control or a control device for controlling the flow rate. In the feed channel, a filling sensor is provided for measuring a filling level. The filling sensor can be designed as a single or multiple sensors. The uniformity of the filling level must be ensured over the entire working width of the card. As types of the sensor, for example, optical or transmitted light sensors are conceivable. Due to the design, a specified fill level (setpoint) is the same for all types of applications due to the geometry for a specific design of a feed channel.

Advantageously, a volume flow control, which calculates a correction of the speed of the fan or the position of the control element from a comparison of the measured filling height with a desired filling level, is provided. The nominal filling level can be present as a fixed value due to the built-in supply channel in the controller. Alternatively, this fixed value can also be determined by the installation location of the fill sensor, so that the measurement of the fill level results in a direct measurement of the difference to the desired fill level.

Further, a card with a device for feeding of fiber material is proposed, wherein the device is designed according to the above description.

Next, a method for feeding a card is proposed, with a certain amount of fiber, from a hopper with a feed roller which cooperates with a feed trough, brought the fiber via a feed roller downstream Auflösewalze in a feed channel and in the feed channel with a fan to a Fiber wadding is compacted with a fiber wadding weight. A selected volume of cotton wool to be fed is assigned a nominal volumetric flow rate of the fan and a nominal pressure in the feed duct. In the feed channel, an actual pressure is measured with a pressure sensor and a drive of the feed roller via a Frequency converter regulated due to a target-actual adjustment of the pressure in the feed channel while maintaining the target volume flow.

Advantageously, the assignment of the desired pressure due to the selected fiber wadding weight is influenced by a fiber wadding weight control while maintaining the desired volume flow. Too high a volume flow of air in the feed channel can result in uneven compression of the fiber wadding through the formation of exhaust air ducts through the fiber wadding from the feed channel to the air-permeable region of the wall of the feed channel. Preferably, a change in the desired pressure due to the fiber wadding weight control is compensated for a constant desired volume flow by a corresponding adjustment of the speed of the feed roller. In this case, the speed is adjusted via a drive associated with the drive or a variable speed drive. Further, it is advantageous if it is compensated to maintain a level by a corresponding adjustment of the speed of the fan or a position of the control element.

Further, it is advantageous if an opening of the feed trough is measured with a sensor. As a result, preferably the measured opening of the feed trough can act as a correction factor on the regulation of the feed roll. This serves to prevent blockages or undersupplies in the feed channel due to a changing density of the fiber flakes in the feed chute.

Figur 1

eine schematische Seitenansicht einer Karde nach dem Stand der Technik;

Figur 2

eine schematische Darstellung einer erfindungsgemässen Vorrichtung in einer ersten Ausführungsform;

Figur 3

eine schematische Darstellung einer erfindungsgemässen Vorrichtung in einer weiteren Ausführungsform und

Figur 4

eine schematische Darstellung einer erfindungsgemässen Vorrichtung mit einer Regelung der Füllhöhe.

Further advantages of the invention are described in the following exemplary embodiments. Show it:

FIG. 1

a schematic side view of a card according to the prior art;

FIG. 2

a schematic representation of an inventive device in a first embodiment;

FIG. 3

a schematic representation of an inventive device in a further embodiment and

FIG. 4

a schematic representation of an inventive device with a control of the level.

FIG. 1 shows a carding machine 1 equipped with a hopper 2, a Füllschachtaustrag 5 and a feed channel 3. Fiber flakes 4 arrive after they have passed through the various stages of a blowroom in the hopper 2. The fiber flakes 4 are through the Füllschachtaustrag 5, comprising a feed roller 6 and an opening roller 7 and a supply of air 8, passed to the feed channel 3. In Füllschachtaustrag 5 is a supply of air 8 is provided to support the flock transfer of the opening roller 7 to the feed channel 3 and to ensure a compaction of the fiber wadding 11 in front of a feed device 10 of the carding machine 1. The air supply blows air 8 tangentially to the opening roller 7 along in the feed channel 3 and thereby compresses the fiber flakes to a fiber wadding 11 with a necessary for further processing in the carding machine 1 high fiber wadding weight. The blown through the air supply air 8 flows through the fiber flakes which are discharged from the opening roller 7 in the feed channel 3. This air flow leaves the feed channel 3 through the air-permeable region 9 of the wall at the end of the feed channel. 3

A feed device 10 following the feed channel 3 feeds the fiber flakes, now in the form of a homogeneous fiber wadding template 11, to the licker-in module 12 of the carding machine 1. In this case, a Kardenspeisewalze with a feed trough for metering the fiber wadding 11 is provided for the feed device 10. The fiber flakes discharged from the feed device 10 from the fiber wadding template 11 are further opened by the lickerins contained in the licker-in module 12 and at the same time freed from a portion of the impurities contained therein. The last licker-in roller of the licker-in module 12 finally transfers the fibers to the card drum 13, which completely dissolves and parallelizes the fibers. The carding drum 13 cooperates with the cover unit 14. After the fibers have partially performed several revolutions on the card drum 13, they are removed from the doffer roller 15 of the card drum 13, fed to a band-forming unit 16 and finally stored in the form of a card sliver 17 in a pot (not shown). FIG. 2 shows a schematic representation of an inventive device in a first embodiment. From a hopper 2 fiber flakes 4 are removed with a feed roller 6. The feed roller 6 cooperates with a feed trough 25. The feed trough 25 is provided with a spring delivery 26 which presses the feed trough 25 against the feed roller 6. The feed trough 25 is thereby opened more or less against the spring delivery 26 by the fiber flakes 4 extracted from the feed roller 6 from the feed hopper 2 in accordance with the density of the fiber flakes 4. The feed roller 6 transmits the fiber flakes 4 to an opening roller 7. The opening roller 7 transfers the fiber flakes 4 from the feed roller 6 into a feed channel 3, in which the fiber flakes 4 are further transported to the carding machine.

Below the opening roller 7 20 air 8 is introduced into the feed channel 3 by an air supply duct 19 by a fan 18 with a drive. Through the air, the fiber flakes are transported in the feed channel 3 against the card and compressed to a fiber wadding 11 at the end of the feed channel 3. The introduced through the fan 18 in the feed channel 3 8 air is discharged through an air-permeable region 9 in a wall of the feed channel 3 at the end again from the feed channel 3 and brought back to the fan 18 via a return line 28. In the return line 28, a false air opening 29 is provided. The false air opening 29 serves to compensate for losses of air at possibly leaking points of the entire air flow from and to the fan 18. Through the air 8, a fiber wadding 11 is formed at the end of the feed channel 3 from the fiber flakes and this compressed by the air pressure. The pressure arises due to a resistance which the air 8 must overcome by flowing through the fiber wadding 11 to pass through the air-permeable region 9 from the feed channel 3 in the return line 28. In the feed channel 3 while a fiber wadding 11 is formed with a certain level 34.

In the feed channel 3, a pressure sensor 24 for measuring an actual pressure of the air 8 in the feed channel 3 is provided. The pressure in the feed channel 3 is decisive for the density of the fiber wadding 11 and thus a yardstick for a fiber wadding weight W to be achieved at the end of the feed channel 3.

Further, a controller 31 is shown. In the controller 31 characteristic curves for a desired volume flow V and a target pressure P for the air 8 are stored. A desired fiber wadding weight W is input to the controller 31 via the input 33. By the controller 31 of this fiber wadding weight W, the corresponding desired volume flow V and the target pressure P are assigned. Via the pressure sensor 24, an actual pressure in the feed channel 3 is measured. By a target-actual-value comparison of the pressure, a corresponding correction of the speed of the feed roller 6 is calculated in the controller and via a frequency converter 23 which acts on the drive 22 of the feed roller 6, the speed of the feed roller 6 is corrected. As a result, a constant pressure and a constant volume flow in the feed channel 3 is ensured.

FIG. 3 shows a schematic representation of an inventive device in a further embodiment. The present arrangement of the device comprising a hopper 2, a feed roller 6, a feed trough 25 with a spring load 26, an opening roller 7 and a feed channel 3 and a fan 18 with an air supply channel 19 and a return line 28 are identical to the arrangement according to FIG FIG. 2 , Next is also the description of the false air opening 29, the air-permeable area 9 and the filling level 34 of FIG. 2 refer to.

In the feed channel 3, a pressure sensor 24 for measuring an actual pressure of the air 8 in the feed channel 3 is provided. The pressure in the feed channel 3 is decisive for the density of the fiber wadding 11 and thus a yardstick for a fiber wadding weight W to be achieved at the end of the feed channel 3.

Further, a controller 31 is shown. In the controller 31 characteristic curves for a desired volume flow V and a target pressure P for the air 8 are stored. A desired fiber wadding weight W is input to the controller 31 via the input 33. By the controller 31 of this fiber wadding weight W, the corresponding desired volume flow V and the target pressure P are assigned. Via the pressure sensor 24, an actual pressure in the feed channel 3 is measured. By a desired-actual-value comparison of the pressure in the control, a corresponding correction of the speed of the feed roller. 6 calculated and a frequency converter 23 which acts on the drive 22 of the feed roller 6, the speed of the feed roller 6 is corrected. As a result, a constant pressure and a constant volume flow in the feed channel 3 is ensured.

Next is in the embodiment shown FIG. 2 the controller 31 is associated with a fiber wadding weight control 30. In this case, a desired fiber wadding weight, which corresponds to the input 33 of the fiber wadding weight, compared with an actual fiber wadding weight at the Karde. With a corresponding deviation of the target pressure P in the feed channel 3 is increased by the controller 31. The speed of the drive 22 of the feed roller 6 is changed by the controller 31 via a frequency converter 23. In order to maintain the desired volume flow V despite the change in the desired pressure P can be adjusted by the controller 31, the speed of the drive 20 of the fan 18 via a frequency converter 21 or alternatively, instead of the speed of the fan 18 in the return line 28, a control element Be provided 32, which also allows a change in the flow rate. An excessively high volume flow of the air 8 in the feed channel 3 can result in uneven compression of the fiber wadding 11 as a result of the formation of exhaust air channels through the fiber wadding 11 from the feed channel 3 to the air-permeable region 9 of the wall of the feed channel 3.

In the embodiment shown, an opening sensor 27 is additionally provided on the feed trough 25. The opening sensor 27 measures the opening state of the feed trough 25 and thereby provides information about the density of the currently extracted by the feed roller 6 from the hopper 2 fiber flakes 4. By the controller 31, this information is processed and as a correction factor to the control of the speed of the drive 22nd the feed trough 6 switched.

FIG. 4 shows a schematic representation of an inventive device with a control of the filling level 34. The present arrangement of the device with respect to a hopper 2 with fiber flakes 4, a feed roller 6, a feed trough 25, an opening roller 7 and a partially filled with a fiber wadding 11 feed channel. 3 and a fan 18 with an air supply channel 19 and a return line 28 are identical to the arrangement according to FIG. 2 , Next is also the description of the false air opening 29, the air-permeable area 9 and the filling level 34 of FIG. 2 refer to. The fan 18 conveys air 8 with a certain volume flow through the air supply channel 19 and the feed channel 3 to the fiber wadding 11. This forms at the end of the feed channel 3, a filling level 34 which denotes the area filled with fiber wadding 11 of the feed channel 3. In the area of the desired filling level, a filling sensor 35 is arranged. By the filling sensor 35, the current filling level 34 or a difference of the current filling level 34 is forwarded to a desired filling level to a volume flow controller 36. The volume flow control 36 controls via a corresponding control signal, the speed of the fan 18 and the drive 20 by means of a frequency converter 21. Alternatively, to control the speed of the fan 18 via the drive can be provided by the flow control 36 in the supply or discharge line of the fan 18 existing Control element 32 are changed in its position accordingly.

The present invention is not limited to the illustrated and described embodiments. Variations within the scope of the claims are also possible as a combination of features, even if they are shown and described in different embodiments.

LIST OF REFERENCE NUMBERS

1

teasel

2

hopper

3

feeding channel

4

fiber flocks

5

Füllschachtaustrag

6

feed roll

7

opening roller

8th

air

9

Air permeable area of the wall

10

feeder

11

fiber wadding

12

Vorreissermodul

13

carding drum

14

flat unit

15

doffer

16

Band-building unit

17

Kardenband

18

fan

19

air supply duct

20

Drive fan

21

Frequency converter fan

22

Drive feed roller

23

Frequency converter feed roller

24

pressure sensor

25

feed trough

26

spring delivery

27

opening sensor

28

Return line

29

Air opening

30

Fiber wadding weight control

31

control

32

regulating element

33

Input fiber batting weight

34

Filling level feed channel

35

fill sensor

36

Flow control

W

Fiber wadding weight

V

Set volume flow

P

Target pressure

Claims (14)

Device for feeding fiber material (4) to a carding machine (1) with a feed chute (2), a hopper discharge (5), a feed channel (3) and a fan (18) for compressing the fiber material (4) in the feed chute (3) to a specific fiber wadding weight, wherein the Füllschachtaustrag (5) via a frequency converter (23) driven feed roller (6) with a feed trough (25) for metering the fiber material (4) from the hopper (3) and an opening roller (7) for transfer of the fiber material (4) from the feed roller (6) to the feed channel (3), characterized in that a control (31) is provided in which for different fiber wadding weights (W) in each case a specific fiber wadding weight (W) a desired volume flow ( V) of the fan () and a set pressure (P) in the feed channel (3) are assigned, and in that a pressure measurement (24) is provided in the feed channel (3). Apparatus according to claim 1, characterized in that in the control a fiber wadding weight control (30) is provided. Apparatus according to claim 1 or 2, characterized in that the fan (18) has a drive (20) with a frequency converter (21) for speed control. Apparatus according to claim 1 or 2, characterized in that in a Lufteintritts- or an air outlet channel of the fan (18), a control member (32) is provided. Device according to one of the preceding claims, characterized in that a sensor (27) for measuring an opening of the feed trough (25) is provided. Device for feeding fiber material (4) to a carding machine (1) with a feed channel (3) and a fan (18) for compressing the fiber material (4) in the feed channel (3) to a specific fiber wadding weight, characterized in that the fan (18) has a drive (20) with a frequency converter (21) for speed control or a control element (32) for controlling the volume flow and in the feed channel (3) a filling sensor ( 35) is provided for measuring a filling level (34). Apparatus according to claim 6, characterized in that a volume flow control (36) which calculates a correction of the rotational speed of the fan (18) or the position of the control member (32) from a comparison of the measured filling level (34) with a nominal filling level is. Carding machine (1) with at least one device according to one of Claims 1 to 7. Method for feeding a certain amount of fibrous material (4) to a carding machine (1), wherein from a hopper (2) having a feed roller (6), which cooperates with a feed trough (25), the fibrous material (4) via one of the feed roller (6) subordinate opening roller (7) placed in a feed channel (3) and in the feed channel (3) with a fan (18) to a fiber wadding (11) with a fiber wadding weight (W) is compressed, characterized in that a selected to be fed Fiber wadding weight (W) a desired volume flow (V) of the fan (18) and a desired pressure (P) in the feed channel (3) are assigned in the feed channel (3) with a pressure sensor (24) an actual pressure is measured and a drive (22) of the feed roller (6) via a frequency converter (23) due to a target-actual balance of the pressure in the feed channel (3) is maintained while maintaining the desired volume flow. A method according to claim 9, characterized in that the assignment of the desired pressure (P) due to the selected fiber wadding weight (W) by a fiber wadding weight control (30) is influenced. A method according to claim 10, characterized in that a change in the desired pressure (P) due to the fiber wadding weight control (30) by a corresponding adjustment of the speed of the feed roller (6) is compensated. A method according to claim 9 to 11, characterized in that for maintaining a filling level (34) by a corresponding adjustment of the rotational speed of the fan (18) or a position of the control member (32) is compensated. A method according to claim 9 to 12, characterized in that an opening of the feed trough (25) with a sensor (27) is measured. A method according to claim 13, characterized in that the measured opening of the feed trough (25) acts as a correction factor on the control (31) of the feed roller (6).

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