DE2031788A1 - Method and device for the continuous dosing of fiber material for presentation to spinning machines - Google Patents

Description

Maschinenfabrik Rieter AG ₁ Winterthur / Switzerland

Statute of limitations and device for continuous dosing of fiber material for presentation to spinning machines.

The invention relates to a method for %

continuous dosing of fiber material for presentation to spinning machines, in which a fiber layer in the form a fleece or a wad of cotton wool is delivered continuously and the amount of fibers in the fiber layer is continuous measured and continuously regulated by influencing the delivery, as well as on a device suitable for this purpose.

The importance of the uniformity of, for example, an opener, a mixer or a card in the form of a fleece or a wad of cotton wool for the quality not only of the _{product directly Λ} produced by such machines, but also that of the presented ™

In the final product produced, it is known, for example, in the quantity or weight of the fiber layer supplied to the machine or weight differences between several supplied fiber layers whose fibers are mixed with one another not only to disrupt the mixing ratio, but in particular to different Kumaern, d. h "Ktärkon, a ribbon, yarn or the like made from the fleece or the wad of cotton wool.

Ka iiit already a mixed way for in several layers

-2-

10 «ÖÖ6 / 0661

supplied fibers of various properties are known to which each fiber layer is continuously fed in the form of a fleece or a wad of cotton wool and is carried along on a weighing belt runs at a constant speed over a weighing device. This is the weight of the individual layers Corrected continuously by changing the supply accordingly, and the weighed layers are then placed one on top of the other and subjected to an opening process.

In this known method, it is disadvantageous that the production occurring at the end of the weighing belt is carried out solely by Changes in the supply to the weighing belt are regulated and thus subject to a relatively large error that is based on Reason between passing the delivery point and the measuring point occurring dead time results. Another disadvantage of the known method is that as a result of the constant speed of the weighing belt is drawn off by take-off rollers, for example, from a filling chute loaded with fiber flocks and layer of fiber deposited on the weighing belt by changing the feed, d. h «for example acceleration or Delay of the take-off rollers, is compressed or warped accordingly, which is particularly important in the case of a wad of cotton wool Tearing.

The object of the invention is not only to avoid the disadvantages of the known method, but also to avoid them to show a way to continuously dosed a continuously delivered fiber layer .and with constant To be able to deliver production.

According to the invention, this object is achieved in that the fiber layer moves at the same speed as when it was delivered passes through a measuring zone for measuring the amount of fiber and is delivered away from the same, and that in the unit of time Amount of delivered fiber by simultaneously changing the amount of delivery, the passage through the measuring zone and the Delivery of the fiber layer is continuously regulated according to the amount of fiber determined in the measuring zone.

-3-109886 / 0661

A particularly useful device for implementation this method is characterized according to the invention by a device for the continuous delivery of a fiber layer ι conveying means for conveying the delivered fiber layer through the measuring zone and subsequent delivery of the measured fiber layer, one of the means of delivery and the conveying means a concurrent speed issuing drive, a measuring device arranged in the measuring zone for measuring the amount of fiber, with the measuring device as well as the drive connected control elements for the drive and a drive transmission that connects the drive to both the delivery device and the, Funding connects.

In the method according to the invention, the fiber layer can be delivered by a pair of take-off rollers of a feed chute, which is preferably charged with flaky fiber material. However, the fiber layer can also be delivered by means of a conveyor belt. In the method according to the invention, the supplied fiber layer preferably passes through a measuring zone which is delimited by the distance between the roller gaps of two pairs of rollers arranged one after the other as viewed in the running direction of the fiber layer. The pairs of rollers are driven at the same speed as the pair of take-off rollers on the filling chute or the conveyor belt used for delivery. In the first case, the Abzugwalzen- Λ can few be simultaneously viewed in the running direction of the fiber layer first pair of rollers at the measuring zone on the hopper.

In the measuring zone, the fiber layer can run over a weighing device. The amount of fiber can also be measured by measuring the density of the fiber layer can be determined by means of corpuscular rays or electromagnetic waves.

After passing through the measuring zone, the fiber layer can be < Subject to the opening process or presented directly to a card

109886/06 6 1

will. But it is also possible to have several metering devices next to one another or one behind the other, d. h »with transverse or longitudinal Delivery direction, to be arranged on a common conveyor belt and the fiber layers delivered from the individual measuring zones to be dissolved if necessary, to be placed on the conveyor belt - preferably one on top of the other - and only then a subsequent one Machine to submit. Furthermore, the delivered from the measuring zone can Fiber layer also dissolved and the dissolved fiber material instead of being deposited on a conveyor belt, by means of a pneumatic one - possibly common in the case of several metering devices arranged one behind the other or next to one another Pipeline in flake form are fed to a downstream machine.

To further explain the invention, some exemplary embodiments are described below with reference to the drawings. In these shows, each in a schematic representation:

1 shows a metering device which is connected upstream of an automatic mixer, in side elevation;

Fig. 2 also in side elevation several along a ge

Dosing device (s) arranged in a common conveyor belt in Fig. 1 shown type in the same direction as the tape travel direction Delivery direction;

3 shows the metering devices with the common conveyor belt from FIG. 2 in plan;

4 shows a number of metering devices arranged on a common conveyor belt in the same representation transverse delivery direction;

5 shows a metering device which is connected upstream of a card, in side elevation;

6 shows a modification of the metering device from the

10988 6/0661

Figures 1 - 5 in side elevation;

FIG. 7 shows a modification of the metering device from FIG. 6; FIG.

According to Fig. 1 is a loaded with flaky fiber material 1, vertically arranged hopper 2 (only partially shown) at its lower end with a in the direction of Arrows E rotating pair of take-off rollers 3.3 * equipped. Because of this the fiber material 1 is conveyed in the direction of arrow F and thereby as a fiber layer 4 in the form of a fleece or a wad of cotton wool on one arranged under the take-off rollers Guide 5 filed. The guide 5 extends inclined downward away from the take-off rollers and is at its there End bent to the horizontal.

A pair of feed rollers 6,6 * driven in the direction of arrows E ¹ and a pair of delivery rollers 7,7 * rotating in the direction of arrows E follow one after the other. Between the pairs of rollers 6,6 ^Χ and 7,7 * is a non-driven, but freely rotatable, cylindrical drag roller 8 in both directions of the arrow G, the axis of rotation 9 of which is parallel to the axes of rotation 10 and 11 of the pairs of rollers 6,6 'and 7 , 7 'and so far below the clamping level K "defined by the roller gap of these roller pairs is arranged that the circumference of the drag roller 8 is essentially affected by the clamping plane K". The turning axis 9 is supported in bearing supports 12 (only one shown) on one end of a balance beam 13, with which the balance occurring here is characterized. The balance beam 13 is pivotably mounted at a point 14 so that the drag roller 8 can be moved vertically in line with the arrow H.

At its opposite end, which has a counterweight 13 ' carries, the balance beam 13 is connected to a displacement encoder 15, which is connected to a multiplier 17 via a line 16 connected is. The multiplier 17 is on the one hand via a comparator IG to which a setpoint generator 19 is connected,

-6-

109886/0661

BPvD

and a rectifier 20 for controlling a motor 21, on the other hand connected to a tachometer generator 22 which is mechanically connected to the motor 21. The motor 21 drives like only shown schematically, via a drive transmission 21 *, with each other with the same circumferential speed, the Rollers 3, 6 and 7 on.

The device described so far works as follows:

From the pair of take-off rollers 3.3 * of the hopper 2 The fiber layer 4 fed to the pair of feed rollers 6,6 'in the direction of arrow F is taken from this and the following Delivery roller pair 7,7 'passed through the measuring zone extending between the roller nips of the roller pairs 6,6 * and 7,7' and runs over the drag roller 8. The weight lying on the drag roller 8 of the weight passing through the measuring zone Fiber layer 4 is determined with the aid of the balance beam 13.

The 7.7 * delivered in the unit of time by the pair of delivery rollers Amount of fiber, d. H. the production P (for example in kilograms per hour) is calculated according to the equation

where A is the applied weight (kg / m) and ν is the speed Gn / h) of the fiber layer passed through the measuring zone. The bearing weight A is obtained, as I said, by means of the balance beam 13, while the speed, ν, is obtained from that with the motor 21 connected tachometer generator 22 is specified

The bearing weight A is taken from the encoder 15 via the line 16 and the speed ν from the tachometer generator 22 to the multiplier 17. Through this they become everyone Time occurring values are multiplied, and in the comparator 18 the product is entered into the setpoint generator 19 with a Setpoint compared. When a difference occurs, the speed of the motor 21 is determined by the comparator 18 is changed in length via the rectifier 20 until the product A · ν is again equal to the nominal value. The production is therefore now by means of the product of the applied weight A and speed ν controlled. The weighing route,

109886/0661 -7-

d. H. the measuring zone between the nips is clear fixed and thus constant, so that possibly occurring marginal influences always remain the same and under certain circumstances can be compensated.

The fiber layer 4 delivered by the delivery rollers 7, 7 'with constant production is then passed through according to FIG an opening roller 23 rotating continuously in the direction of arrow M is dissolved in fiber flocks 24 and, as a fiber layer 27, on a layer arranged below it, in the direction of the Arrow N continuously moving conveyor belt 25 is deposited on a fiber layer 26 already lying there and coming from another metering device. In this way, the two fiber layers at the end of the conveyor belt 25 pass through a pair of rollers 28 together to an opening roller 29 rotating in the direction of the arrow O. From this the flakes are, for example, passed through a line 30 in connection with a fan (not shown) is fed in the direction of arrow P to an automatic mixer.

Figures 2 and 3 show several metering devices 35, 36, 37 and 38, for example, of the type shown in FIG. 1. Filling shafts 31, 32, 33 and 34. All of these metering devices are arranged on a common conveyor belt 39, their The direction of delivery (arrow A) corresponds to the direction of travel (arrow B) of the belt. The Ib the dosing devices 35, 36, 37 and 38 Fibers with constant production are used open by corresponding opening rollers 40, 41, 42 "or 43 continue« running on the conveyor belt 39 in superimposed layers 35 ·, 36 ", 37 'and 38' deposited so that at the end of the conveyor belt the total production in terms of quantity is continuous in one Mixture accrues. So there is a continuous metering old continuous mixture.

Gen & A Fig. 4 are a plurality of metering devices 44, 45, 46 and 47 old transverse delivery direction (arrow C) to a «common conveyor belt 48 arranged · The result ijft la we sent love that

-8th-

109886/0661

same.

According to FIG. 5, a vertically arranged filling chute 51 loaded with flaky fiber material 50, which is again only partially shown, is equipped at its lower end with a pair of take-off rollers 52, 52 'rotating in the direction of arrows Q. This conveys the fiber material 50 withdrawn from the feed chute 51 in the direction of arrow R and places it as a fiber layer, for example in the form of a wad of cotton wool 53, on a downward sloping guide 54, the lower end of which is again bent horizontally. From there, after passing through the measuring zone, it is fed to a lickerin 55 rotating in the direction of arrow S, which is assigned to a drum 56 rotating in the direction of arrow T of a card 57 which is only partially shown. Between the guide 54 and the lickerin 55 a ^{pair of intake rollers 58, 58 * rotating in the direction of arrows Q 1} and a pair of delivery rollers 59, 59 * rotating in the direction of arrows Q " _{are arranged one after the other, their clamping plane L £} horizontal through the nips runs.

Within the measuring zone lying between the roller pairs 58, 58 'and 59, 59 ", two weighing tables 60 and 61 are arranged in this example, the upper side of which lies approximately in the clamping plane Lg. The weighing tables 60, 61 with their roller pairs 58, 58' or 59, 59 'facing ends pivotable up and down in a joint 62 or 63 and arranged in such a way that their adjacent ends 64 and 65, which are angled downwards, are approximately in the middle of the measuring zone *

These downwardly angled ends 64 and 65 of the weighing tables 60 and 61 are supported on the upper part 66 of a load cell 67, which is connected by a line 68 via not its own Control members are connected approximately in the manner of those from FIG. 1 with a motor, not shown, which controls the rollers 52, 58 and 59 a drive transmission 69 at the same speed drives.

109886/0 6 61

The of the roller pairs 58, 58 'and 59, 59' through the intermediate Wadding web 53 guided by the measuring zone slides over weighing tables 60 and 61. From the to a desired target weight The load cell 67 adjusted to the wadding becomes the weighing tables 60 and 61 pivotable about the joints 62 and 63 in one held in a certain position. If the weight of the cotton wool currently in the measuring zone deviates from the target weight, tilt the weighing tables 60 and 61 correspondingly down or up, whereby The load cell indicates a value that has changed compared to the setpoint value.

Via a line 68 the value from the load cell is sent to each Time communicated to the control organs, which about the speed of the motor driving the rollers 52, 58 and 59 and thus the greetings of the delivery, the passage through the Change the measuring zone and the delivery of the wadding by the delivery roller pair 59, 59 * to the card 57 accordingly. The those Delivery rollers 59, 59 'rait constant production leaving Watts web 53 is the card 57 via a spring plate 70 in connection with a feed roller rotating in the direction of arrow V 71 supplied .. The Sinzugw * lze 71 is by means of a drive transmission 72 is also connected to the aforementioned motor via the drive transmission 69 and is synchronized Kit is driven by rollers 52, 58 and 59. This is the indentation presented with constant production of the card 57. Wadding to the lickerin 55 guaranteed. .

ßiue variant of a metering device, as it is instead of the Dosing devices shown in FIGS. 1-5 described above WVryariittet can be shown in FIG. 6. After a The pair of take-off rollers 73, 73 threatening in the direction of the arrows W fciuee filling chute 75 loaded with fiber flocks 74 i * t sitti iu direction dör Pi'eile W * rotating pair of rollers 76 »76 * in a »r extension of the longitudinal axis of the filling chute 75 in such a way an-.fT« io-rdaet, -di.ß «Yes take-off roller pair 73, 73" at the same time the feed-

-10-

103 886/06 61

BATH

_ ₁₀ _ 2031783

roller pair and the roller pair 76, 76 'the delivery roller pair for a fiber layer passing through the measuring zone in between 79 represents. The rollers 73 and 76 are driven via a drive transmission 78 at the same speed driven by a motor not shown.

In the measuring zone are to determine the amount of fiber Fiber layer 79 a radiation source 80 for radiation and a corresponding detector 82 arranged such that the Radiation 81 passes through the fiber layer 79 · The radiation can be a corpuscular radiation as well as a be electromagnetic wave radiation. The detector 82 is connected to the motor for drive via control elements (not shown) of the rollers 73 and 76 and provides a signal corresponding to any deviations in the amount of fiber, due to the amount of delivery, passage and delivery of the fiber layer 79 is changed accordingly.

FIG. 7 shows a metering device which is otherwise the same as in FIG. 6, how the dead time in the controlled system can be virtually completely switched off. The detector 82 of Fig. is connected to a recording head 83 pointing towards of the arrow Z via rollers 84 and 85 surrounding memory 86, for example a band-shaped information carrier is. The memory is driven synchronously with the fiber layer passing through the measuring zone. At a distance equal to the distance Y between Between the measuring point and the point of delivery corresponds to a scanning head behind the recording head 83 on the memory 87 arranged. This is connected to a multiplier 88, on the one hand via a comparator with setpoint generator and a rectifier (all three not shown) and on the other hand is connected to the motor via a tachometer generator 89. The motor 90 is ver with the rollers 73 and 76 binds and drives them at the same speed. The roller 84 for driving the memory 86 is via a Drive transmission 91 with the one located on the hopper 75

10988 6/066 1

BATH

The take-off roller 73 ′ is coupled and thus also experiences any drive changes from the motor 90.

If the detector 82 now shows a change in the weight of the fiber layer 79 delivered by the pair of take-off rollers 73, 73 ' determined by a predetermined setpoint value, the signal of the detector via the recording head 83 to the memory 86 transfer. Reaches the signal recorded in memory the scanning head 37, it becomes the multiplier 88 from this communicated. From this the motor 90 is controlled and the speed the rollers 73 and 76 as well as that of the roller 84 changed accordingly.

Due to the delayed transmission of the from the detector originating signal to the multiplier and finally the motor 90 it is achieved that only upon delivery by the delivery roller pair 70, 7b * does a change in the one determined in the measuring zone Value corresponding speed of the delivery rollers 7'ö, 76 'takes place. Accordingly, the fiber layer is removed from the delivery rollers 76, 76 * without dead time between measurement and delivery delivered with constant production.

The delay in the signal at the motor can also play a role in the borderline case of small production. If the production is, for example, less than 10 kg / h, the forward speeds are very slow, since, for reasons of eating and equipment, a minimum weight of approximately 1 kg / a is necessary. In order to achieve a sufficient accuracy of the measurement, it can therefore be advantageous to store the measured value, for example in the manner shown in FIG.

It is also possible that shown in FIGS Arrangement of radiation source 80 and detector 81 in one opposite the position shown rotated by 90 °, for example. In this case, the from the take-off rollers 73, 73 ·

-12- 10 9 8 8 6/0661

delivered fiber layer from the narrow side then on their entire narrow cross-section can be irradiated.

The absolute advantage of the procedure according to the invention consists mainly in the fact that not only a constant production of a template for wiping fiber material with different properties occurs, but also a continuous one Dosing of a fiber layer for presentation to a card can be done. This allows additional devices to this last-mentioned purpose, such as an inclined drop or leveling boards, is omitted.

0 9836/06 61

BATH ORIQiMAL

Claims (1)

- 13 claims f'l ») Process for the continuous dosing of fiber material for submission to spinning machines, in which a fiber layer in the form of a fleece or a wad of cotton wool is continuously delivered and the amount of fiber in the fiber layer is continuously measured and continuously regulated by influencing the delivery, thereby geke η η ζ eich η et that the fiber layer passes through a measuring zone for measuring the amount of fiber at the same speed as on delivery and is delivered away from the same, and that the amount of fiber delivered in the unit of time by simultaneously changing the amount of delivery, the passage through the M measuring zone and the delivery of the fiber layer is continuously regulated according to the amount of fiber determined in the measuring zone. 2 »Method according to claim 1, characterized in that that the amount of fiber in the measuring zone is determined by weighing » 3. The method according to claim 1, characterized in that the amount of fiber in the measuring zone by means of radiation measurement is determined. 4. The method according to claim 3, characterized in that the radiation used is a Korpuskularstrah- % treatment. 5. The method according to claim 3, characterized in that the radiation used is electromagnetic Wave radiation is ü. Method according to one of the preceding claims, characterized in that the fiber layer after Delivery from the measuring zone subjected to an opening process will. -14- 109886/0661 7. The method according to any one of claims 1-5, characterized in that the fiber layer is attached to a card is delivered. 8. The method according to any one of the preceding claims, characterized in that the amount of delivery, of the passage and delivery of the fiber layer compared to the time of measurement of the one that has just been delivered Amount of fiber is changed with a delay. 9. Device for performing the method according to one of the preceding claims, characterized by a device (z. B. 3.3 *; 73.73 ·) for continuously delivering a fiber layer (ζ. Β. 4 '), conveying means (ζ. B. 6.6 *, 7.7 ·; 73.73 ', 76.76 ·) for conveying the delivered fiber layer through the measuring zone and subsequent delivery of the measured fiber layer, a drive giving the delivery device and the conveying means a simultaneous speed (e.g., 21 etc.), a Measuring device arranged in the measuring zone (ζ. Β. 8,13,15) for measuring the amount of fiber, with the measuring device as well Control units connected to the drive (e.g. 17, -20, 22) for the drive and a drive transmission (e.g. 21 *), which the Drive connects both with the delivery device and with the funds. 10. Apparatus according to claim 9, characterized in that the device for delivering the fiber layer (ζ. B. 4) consists of a pair of rollers (e.g. 3.3 '). 11. The device according to claim 10, characterized in that the Y / roller pair (z. B. 3.3 ') the pair of take-off rollers a filling chute (e.g. 2) filled with fiber flakes (1). 12. Device according to one of claims 9-11, characterized g e -k ο η η ze i c h η e t that the funds from one the 109886/0661 BAD Fiber layer (e.g. 4) in the measuring zone pulling in the feed roller pair (e.g. 6, 6 ¹ ) and a delivery roller pair pulling the fiber layer from the measuring zone and delivering it (e.g. 7 ¹ ) and the path of the fiber layer (e.g. 4) is essentially flat in the measuring zone delimited by the roller gaps. 3.3. Device according to claims 12 and 13, characterized in that g e k e η η, that the pair of rollers (73, 73 ') for delivery the fiber layer (79) at the same time the Einügwalzenpaar for the Measuring zone is. 14. Device according to one of claims 9-13, characterized g e k e η η ζ e ic h η e t that the measuring device consists of a There is a scale (e.g. 8, 13, 15 etc.). 15. Device according to one of claims 9-13, characterized in that the measuring device consists of a Radiation source (80) with an associated detector (82) for determination the thickness or density of the fiber layer (79) passed through the measuring zone. lü. Device according to Claim 15, characterized in that the radiation source (80) is one for corpuscular rays. % 17. The device according to claim 15, characterized in that the radiation source (80) is such for one electromagnetic wave radiation is 18. Device according to one of claims 9-17, characterized in that g e that the one with the measuring device (e.g. 80, 82) connected control organs (88, 89 etc.) a Have delay device (83-87) for the 'Ua & sig'nal supplied to them, the delay time of which is preferably corresponds to the time it takes for an amount of fiber to pass through Messötelle needed until delivery from the measuring zone. 109886/0681 "*?" 19. The device according to claim 18, characterized in that that the delay device consists of an information carrier driven synchronously with the conveying means (73, 73 ', 76, 76') (86) consists of a recording head and a scanning head (83 and 87) for the measurement signal are arranged. 10 3 8 86/0661 BATH Blank page