EP0275471A1 - Procédé et appareil pour égaliser la densité d'un voile de fibres à l'entrée d'une machine textile - Google Patents

Procédé et appareil pour égaliser la densité d'un voile de fibres à l'entrée d'une machine textile Download PDF

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Publication number
EP0275471A1
EP0275471A1 EP87118415A EP87118415A EP0275471A1 EP 0275471 A1 EP0275471 A1 EP 0275471A1 EP 87118415 A EP87118415 A EP 87118415A EP 87118415 A EP87118415 A EP 87118415A EP 0275471 A1 EP0275471 A1 EP 0275471A1
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EP
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Prior art keywords
feed
clamping gap
groove
signal
plate
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Application number
EP87118415A
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German (de)
English (en)
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EP0275471B1 (fr
Inventor
Paul Stäheli
Robert Demuth
Peter Fritzsche
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G23/00—Feeding fibres to machines; Conveying fibres between machines
    • D01G23/06—Arrangements in which a machine or apparatus is regulated in response to changes in the volume or weight of fibres fed, e.g. piano motions

Definitions

  • the invention relates to a method and a device for compensating the density of a fiber wad fed into a textile machine, as defined in the preamble of the first method and the first device claim.
  • the homogenization of the fiber wadding at the entrance to a textile machine that processes the wadding - also called a mat - is an essential prerequisite for the uniformity of the product delivered by this machine. With increasing processing speed, this prerequisite becomes even more important, since fewer machines are used for the same amount of fiber wadding to be processed, so that the possibility of duplication from a larger number of machines and the resultant equalization of the product becomes smaller.
  • a feed means of a card consisting of a fixedly arranged feed plate and a drivable feed roller movably arranged above it. This feed roller is pressed at both ends by means of springs against the fiber wadding located between the feed roller and the trough plate.
  • a similar arrangement is known from DE-A-32 05 776.
  • the movements of the feed roller resulting from the unevenness in the fiber wool are emitted by sensors provided at both ends of the feed roller as signals to a control unit which calculates the necessary speed change of the feed roller in order to compensate for these unevenness as far as possible.
  • the main disadvantage of this system is that the feed roller to be driven is also used to scan the unevenness in the fiber wadding, which inevitably leads to interference in the measurement signals, even if precautions are taken in the arrangement of the drive of the feed roller to the directions of the To obtain driving force of the feed roller drive perpendicular to the direction of movement of this roller during the scanning.
  • a disadvantage of this system is not the measuring principle, but the type of fiber transfer to a subsequent licker-in roller (also called a beater), in that the fiber transfer point on the trough plate (or pedals) moves due to the swiveling of the trough plate relative to the stationary licker-in roller, which means that the position of the transfer point of the fiber wadding from the trough plate (or pedals) to the licker-in roller also moves alternately in the direction of rotation of the licker-in roller and against it, which creates an unrest in the transfer of the fibers to the licker-in roller.
  • the disadvantage of this system is that the density of the fiber wadding is measured before it is drawn in between the trough plate and the feed cylinder, so that changes in the fiber wadding can occur until it is drawn in between the trough plate and the feed cylinder, which then no longer match the measured values would match.
  • a trough plate and a feed plate as well as a feed cylinder and a feed roller are each the same el acts.
  • the invention is therefore based on the object of finding a system which detects and corrects the inequalities in the fiber wad density to be fed in easily and yet with sufficient accuracy.
  • the advantages achieved by the invention are that the density of the fiber wadding to be fed in can be determined without the disadvantages mentioned.
  • the measuring point or the measuring plane, respectively. the measuring direction can be provided such that the determination of the change in thickness of the fiber mat can be carried out close to the narrowest nip between the feed plate and the feed roller, i.e. essentially close to the point at which the fiber mat is taken over by the licker-in roller. This creates a very small distance between the measuring point and the fiber transfer point, i.e. the time of the measurement is very close to the time of the necessary speed correction.
  • a card 1 comprises from left to right, as seen in FIG. 1, at the card entrance a fiber feed means 2, shown with a dash-dotted line, a licker-in roller 3, also called a beater, a reel 4 with a cover 5, a fiber pile take-off roller 6, also called a doffer roll, and a fibrous web compacting unit 7 for forming a card sliver 8.
  • the fiber feed means 2 comprises a rotatable and drivable feed roller 9, also called feed cylinder, a feed plate 10, also called trough plate, which cooperates with the feed roller and is pivotally mounted about a pivot axis 11.
  • the feed roller 9 is arranged stationary, and the pivotability of the feed plate 10 is limited by an adjusting screw 12, in the direction of movement away from the feed roller 9, and by a stop mentioned later in the opposite direction.
  • the feed roller 9 is driven by a gear motor 13.
  • a fiber mat 15 is fed to the fiber feed means 2 on a feed plate 14.
  • the fiber mat is fed in a manner known per se to the much faster rotating licker-in roller than the compressed fiber mat.
  • the nonwoven fabric processed between the drum 4 and the lid 5 is removed from the doffer roller 6 and passed on to the nonwoven compression unit 7, in which the nonwoven fabric is compressed into the card sliver 8.
  • the ratio of the peripheral speed of the doffer roller 6 to the peripheral speed of the feed roller 9 gives the so-called draft ratio of the card.
  • the food plate 10 is pivoted away from the feed roller 9 until the food plate contacts the set screw 12. This position of the food plate 10 is referred to as the operating position.
  • This clamping effect causes measurable variables described later in the fiber feed means 2, by means of which a signal 16 corresponding to the density of the “pinched” fiber mat 15 is continuously obtained.
  • two signals 16A, 16B from left to right on the pivot axis 11 of the feed plate 10 are attached strain gauges, which sense the transverse force of the bearing journal of the feed trough.
  • These signals 16A, 16B are applied to a measuring amplifier 16C, which first adds the signals and then amplifies them, so that the signal 16 is produced, which represents an amplified mean signal.
  • the measuring amplifier 16C converts the signals from the strain gauge transducers into a DC voltage which is between -10 and +10 V.
  • the signal 16 is input to a controller 17, together with a control signal 18 for the wad thickness, a speed signal 19 of the doffer roller 6 and a speed signal 20 of the geared motor shaft 21, the control signal 18 and that Speed signal 19 of the doffer roller 6 have a predetermined value.
  • the value of the manipulated variable signal 18 can be selected at a decade switch 18A and finally determines the desired band number.
  • the controller "processes" the aforementioned signals into an output signal 22, by means of which the speed of the geared motor 13 is corrected in accordance with the deviations in the density of the fiber mat 15 in a clamping gap area 23 such that the density of the fiber mat when leaving the Clamping gap area is substantially balanced.
  • the controller 17 essentially consists of a microcomputer 17A from Texas Instr. Type 990 / 100MA with the necessary number of EPROMS type TMS 2716, also from Texas Instr., For programming the control functions, as well as a control unit 17B type D 10 AKN RV 419D-R from AREG, Federal Republic of Germany, Gemrigheim.
  • the control unit 17B amplifies a speed signal emitted by the microcomputer to the output signal 22 and receives the signal 20 for checking and regulating the feed roller speed.
  • the run-in signal 16 is first processed in a stage 17C.
  • the mean value of the incoming signal is recalculated from a fixed number of the last read values. In this way, if desired, the long-term deviation of the template can be determined (drift filter).
  • the instantaneous value of the incoming signal is compared with the mean value in stage 17C and the deviation is communicated to the microcomputer 17A as the actual value.
  • the latter is programmed as a PI controller and uses the control algorithm specified in the EPROMs and preprogrammed device-specific data to calculate a control value x from the setpoint of the decades, which forms the setpoint for the AREG controller 17B and is supplied to it, as schematically by means of the corresponding one Arrow between blocks 17A and 17B is indicated. It is also possible to carry out the functions of stage 17C in the microcomputer when installing the corresponding EPROMS, so that a separate stage 17C is unnecessary.
  • the AREG controller represents independent control electronics upstream of the control motor 13.
  • the setpoint specified by the microcomputer 17A is compared in the control electronics with the tachometer actual value 20, the difference is amplified and fed to the motor via the power circuits.
  • the control electronics 17B works as a voltage metering and only supplies the motor with as much voltage 22 as is required to apply the required torque and maintain the speed.
  • the processes in the nip area 23 are defined by the interaction of the feed roller 9 and the feed plate 10, in that area the fiber mat 15 is pressed from the original thickness D to a thickness (not shown) which it immediately before leaving the area 23 has.
  • the clamping gap region 23 thus ends at the edge of the food plate 10, referred to as the fiber delivery edge 24, at which the fiber mat 15 is no longer clamped by the food plate 10.
  • the directions of rotation of the feed roller 9, the breeze 3, the reel 4 and the doffer roller 6 are each identified by the arrows U.
  • the fiber material moves through the card in accordance with these directions of rotation.
  • FIG. 2 shows the fiber feed means 2 from FIG. 1 in an enlarged representation and in somewhat more detail, for which reason the same elements are provided with the same reference symbols.
  • pivot axis 11 is accommodated in a stationary bearing housing 26 belonging to the machine housing 25 (only indicated with hatching).
  • a stop 27 which prevents the feed plate 10 from resting on the feed roller 9 when there is no fiber mat 15.
  • a carrier 28 receiving the set screw 12 and the gear motor 13 are fastened to the machine housing 25.
  • FIG. 3 shows a variant 2.1 of the fiber feed means from FIGS. 1 and 2, so that the same elements are provided with the same reference symbols.
  • This variant has a feed plate 29 arranged below the feed roller 9, as seen in FIG. 3, which is pivotably mounted by means of a pivot axis 31 accommodated in a bearing housing 30 fastened to the machine housing 25.
  • a set screw 32 limits the pivotal movements of the feed plate 29 in a direction away from the feed roller 9, while a stop 33 prevents the feed plate 29 in a direction of movement against the Feed roller 9 can come into contact with this roller, the latter direction of movement of the feed plate 29 being caused by a compression spring 34.
  • the set screw 32 is received by means of a carrier 35 and the spring 34 by means of a carrier 36 each from the machine housing 25.
  • the stop 33 is the end face of a feed plate 37, which is also attached to the machine housing 25.
  • the clamping gap area 23.1 corresponds to the clamping gap area 23 of FIGS. 1 and 2.
  • measuring means are defined which are used to generate the signal 16 emitted by the feed means 2.
  • FIGS. 6, 10, 14, 18 and 22 show elements of the feed means of FIG. 3. Accordingly, the same elements are provided with the same reference numerals in the figures mentioned.
  • FIG. 5 shows the feed plate 10, the pivot axis 11 and the bearing housing 26 as well as a second bearing housing 26.1 which also receives the pivot axis 11.
  • the feed plate 10 has two bearing legs 38, by means of which the feed plate 10 is pivotably mounted on the pivot axis 11.
  • the pivot axis 11 each has a surface 39 (FIGS. 34 and 35)) for accommodating one strain gauge 90 each.
  • These strain gauges 90 are arranged in such a way that they each generate a signal corresponding to the magnitude of a force F (FIGS. 4, 33 to 35) produced during operation on the feed plate 10, both signals 16A, 16B in the mean value generator 16C (not shown here) ) are converted into the previously mentioned signal 16.
  • the force F is determined by two force components together, on the one hand from a force component which is caused by the pressure forces generated by the fiber mat in the wedge gap between the feed plate and the feed roller and on the other hand from a force component which arises from the friction forces occurring in the wedge gap.
  • the total resulting force F R (is equal to compressive force + frictional force) can be broken down into two components, namely a horizontal component F H and a vertical component F V.
  • the vertical force component is relatively small, since the corresponding contributions of the pressure and friction forces point in opposite directions. This component thus changes only slightly when the density of the fiber template changes.
  • the horizontal force component on the other hand, the corresponding contributions of the pressure and friction forces add up, so that there is a pronounced dependency here between F M and the change in density of the fiber template in the clamping gap area.
  • This dependency is exploited according to the invention in that the strain gauges 90 are also essentially placed in a horizontal plane and thus most sensitively determine changes in density of the fiber template in the nip area.
  • the optimal direction of the force F is roughly horizontal and can be determined by experiment. However, an approximation to this optimal direction is enough to make a sensitive measurement.
  • this type of measurement also represents a significant difference from the prior art, in which a relative movement between the feed plate and feed cylinder is used for the measurement.
  • the compressive forces increase with increasing density of the fiber template, but so do the frictional forces, which work against the compressive forces due to the indispensable curvature of the plate around the feed cylinder, so that the measurement cannot be carried out sensitively.
  • the horizontal direction is only the preferred direction for the force measurement if the card is designed as in FIG. 1.
  • the direction of force would have to be selected accordingly.
  • FIG. 7 shows the feed plate 29, the pivot axis 31 and the bearing housing 30 as well as a second bearing housing 30.1 which also receives the pivot axis 31 as a floor plan of FIG. 6.
  • the feed plate 29 has two bearing legs 40 which receive the pivot axis 31.
  • strain gauges for this variant are also arranged in such a way that they each generate a signal corresponding to the magnitude of a force F.1 (FIG. 6) generated during operation on the feed plate 29, with both signals in a mean value generator (not shown) in the Signal 16 mentioned earlier can be converted.
  • the force F.1 builds up in an analogous manner to the force F described for FIGS. 4 and 5.
  • the optimal direction of the force F.1 is also determined by experiments, an approximation to this optimal direction also being sufficiently precise.
  • FIGS. 8 and 9, 12 and 13, 16 and 17, 20 and 21 as well as 24 and 25 show, with the exception of the measuring means for determining the signal 16, the same elements as were shown with FIGS. 4 and 5, which is why they are the same Reference numerals are used for the same elements.
  • FIGS. 10 and 11, 14 and 15, 18 and 19 and 22 and 23 show, with the exception of the measuring means for determining the signal 16, the same elements as were shown with FIGS. 4 and 5, which is why they are the same Reference numerals are used for the same elements.
  • FIGS. 10 and 11, 14 and 15, 18 and 19 and 22 and 23 with respect to the elements shown in FIGS. 6 and 7.
  • the measuring means of FIGS. 8 and 9 is a load cell 41 assigned to the adjusting screw 12 such that it outputs a signal 16 corresponding to the size of a force F.2 (FIG. 8).
  • This force F.2 is one of the fiber mat 15 present in operation of the clamping gap region 23 mentioned (not in FIG. 8) shown) generated forces resulting force which acts in the direction of the longitudinal axis (not shown) of the adjusting screw 12.
  • the set screw 12 is arranged in the middle of the length L of the feed plate 10.
  • the horizontal distance H, as seen in FIG. 8, of the above-mentioned longitudinal axis up to the fiber delivery 24 is not particularly critical, nevertheless the smallest possible distance H should be sought.
  • a load cell 41.1 assigned to the set screw 32 (FIG. 10), to which a force F.3 acts analogously to the force F.2 of FIG. 8.
  • the set screw 32 is in the middle of the length L and with a horizontal distance H.1, as viewed in FIG. 10, from a fiber deflecting nose 44 on the feed plate 29 to that in the direction of the longitudinal axis (not shown) Set screw 32 acting force F.3.
  • Fig. 12 respectively. 13 and 14 resp. 15 each show a variant in the use of load cells to determine the density of the fiber mat in the wedge gap area 23 or. 23.1 (not shown in FIGS. 12 and 14) force generated during operation.
  • the dining plate 10 of FIGS. 12 and 13 in the end face 42 facing the beater 3 has a depth T and a height B (FIG. 12) having groove 43.
  • the height B is selected in such a way that load cells 41.2 can be pushed into the groove 43 without play in a position shown in FIGS. 12 and 13 and held in place (not shown).
  • the fiber mat 15 located in the wedge gap between the feed plate 10 and the feed roller 9 generates forces which tend to have a feed plate part 60 located between the groove 43 and the fiber-dispensing edge 24 around an inner groove edge 61 to pivot in a direction R. These forces result in a force F.4 acting over the entire length L, which generates a corresponding signal in the load cells 41.2.
  • the signals of the individual load cells are averaged to signal 16 in an averager (not shown).
  • FIGS. 14 and 15 functions with respect to the generation of signal 16 essentially the same as described with reference to FIGS. 12 and 13, which is why the elements necessary for generating signal 16 are provided with the same reference numerals as 12 and 13, with the exception of the force F.5, which already has a different size than the force F.4 of FIG. 12 due to the different type of fiber transfer via the nose 44 of the feed plate 29 to the briseur 3, in which the fibers are transferred from the feed roller 9 to the breeze 3 in so-called synchronism.
  • the synchronism arises from the fact that the feed roller 9 and the beater 3 have the same direction of movement at the fiber transfer point (see FIG. 1).
  • the force component F.5 can play a role in the formation of the force component F.5, such as the shape of the food plate 10 or. 29 in the area 23 resp. 23.1 and the distance of the groove edge 61 from the fiber mat 15 leading surface of the food plate 10, respectively. 29. He is also the same not limited to the number and arrangement of the load cells shown in Figures 13 and 15. It is understood that, for example, depending on the strength of the groove 43 to the fiber release edge 24 (FIG. 12) or. up to the nose 44 (FIG. 14) extending plate part, one, two or more load cells 41.2 can be provided.
  • the measuring means consists of three load cells 41.3 which are arranged in a groove 45 which is embedded in the feed plate 10 and opens into the clamping gap region 23 (FIGS. 1 and 2) in the clamping gap.
  • the signals emitted by the individual load cells 41.3 are converted into signal 16 in an averager (not shown).
  • the distribution of the aforementioned load cells in the groove 45 is essentially as shown in FIG. 17.
  • the number of load cells is not limited to the three shown.
  • the number of load cells is not limited to the three shown.
  • the force components are determined more precisely over the length L (FIG. 17) the dining plate 10 is to be detected, a larger number of load cells can be distributed.
  • 18 and 19 is composed of a membrane 47 inserted into the feed plate 29, a pressure converter 48 and a pressure fluid system 49 connecting the membrane 47 to the pressure converter 48.
  • a force component F.7 (FIG. 18) analogous to the force F.6 of FIG. 16 causes a pressure on the diaphragm 47, as a result of which a force transmission is transmitted via the hydraulic fluid system 49 to the pressure converter 48, which is a force F. 7 corresponding signal 16 is generated.
  • This overpressure is recorded with the measuring means shown in FIGS. 20 and 21, in that a measuring groove 50 is let into the food plate 10, which is inside the feed plate 10 is connected to a pressure transducer 53 via a pressure line 51 and a pressure line 52 connected to the feed plate 10.
  • This pressure converter 53 converts the excess pressure determined in the measurement groove 50 into the signal 16.
  • the measurement groove 50 is not continuous over the entire length L, i.e. the length L.1 of the measuring groove 50 is shorter than the length L of the feed plate 10, so that the measuring groove 50 is a groove located in the clamping gap area 23 and only open against the clamping gap.
  • the measurement groove forms an acute angle ⁇ with an imaginary plane E, which includes the mouth edge 54 of the wall 55 of the groove 50 as a tangential plane. This arrangement prevents a fiber jam from occurring in the groove 50.
  • the angle ⁇ has a maximum of 30 degrees.
  • FIGS. 20 and 21 show one of the measurement grooves 50 of FIGS. 20 and 21 analog measurement groove 50.1 with a pressure line 51.1 connected to it and a pressure line 52.1.
  • the measuring means of FIGS. 22 and 23 not only measure the pressure which, as described, arises from the pressing out of the air from the fiber mat, but it also becomes a constant one from a compressed air source 56
  • the amount of compressed air is pressed into the compacting fiber mat using measuring groove 50.1.
  • the enforcement of this predetermined amount of compressed air the fiber mat occurs against the resistance of the fiber mat, so that a pressure corresponding to this resistance is transmitted from the pressure lines 51.1 and 52.1 to a pressure transducer 53.1 connected to the pressure line 52.1.
  • the pressure converter 53.1 converts these pressure variations into the signal 16.
  • the measurement groove 50.1 also has the angle ⁇ described for FIG. 20.
  • FIGS. 24 and 25 show a variant of the measuring means of FIGS. 22 and 23, in that the quantity of compressed air which is constant from the compressed air source 56.1 is blown into the fiber mat located in the wedge gap area 23 by means of an injection groove 58. This air travels in this fiber mat in a direction W opposite to the direction of rotation of the feed roller until it can escape into the atmosphere through a ventilation groove 59 and a ventilation line 57 connected to it.
  • a pressure transducer 53.2 is connected to the pressure line 52.2. This pressure converter 53.2 converts the pressure existing in the pressure line 52.2 into the signal 16.
  • a resistance range can be defined with the distance M between the injection groove 58 and the ventilation groove 59.
  • FIGS. 26 and 27 show a variant 2.2 of the fiber feed means from FIG. 2, in that the feed plate 10 can not only be pivoted about the pivot axis 11, but that it can also be pivoted about a pivot axis 62, which is coaxial with the axis of rotation of the feed roller 9 lies. This pivotability is shown schematically with the radius arrow S.
  • a holding bracket 63 which has two legs 64 (only one visible in FIG. 26), in which the pivot axis 11 is mounted.
  • the legs 64 each have a guide slot 66
  • the lower guide surface 67 (seen with a view of FIG. 26) has a curvature with the radius S.
  • the upper guide surface 68 opposite the lower guide surface 67 is provided parallel to the guide surface 67.
  • These guide slots 66 each serve to receive two guide pins 69, which are fixedly arranged in a machine housing part 70.
  • the distance (not marked) of these two guide bolts 69 is selected in relation to the length (not marked) of the guide slot 66 such that the holding bracket 63 can be pivoted about the pivot axis 62 for a given pivot length (not marked).
  • the holding bracket 63 In order to hold the holding bracket 63 in a selected pivot position, it is held in place by means of two screws 71 screwed into the machine housing part and projecting through the guide slot 66.
  • set screw 12 is arranged on an end part 63.1 of the holding bracket 63 directed against the licker-in roller 3.
  • this variant can also be used to combine all of the elements shown in FIGS. 4 to 25 in order to generate the signal 16. The application of these elements in connection with this variant is therefore not repeated.
  • This mobility of the feed roller 9 is given by the fact that the free ends 73 of the feed roller 9 projecting on both sides (only one shown with FIG. 28) of the feed roller 9 are accommodated in a bearing bush 74, which is between two stationary sliding guides 75 and. 76 are guided.
  • the displacement range of the feed roller 9 is limited on the one hand by a stationary stop 77 and by an adjusting screw 78 which is received in a carrier 79 which in turn is attached to the machine housing 25.
  • the stop 77 has the same function as the stop 27 described earlier.
  • the fiber mat 15 on the feed plate 72 is slidably moved from the feed roller 9 into the wedge gap between the feed roller 9 and the feed plate 72, whereby the feed roller 9 from its starting position, in which the bearing bushes 74 each rest on the corresponding stop 77, until they enter the operating position are raised, in which the bearing bushes 74 each abut the adjusting screws 78.
  • FIG. 30 shows an application of the feed means of FIG. 1 in a rotor open-end spinning machine.
  • the feed roller 9 transfers a fiber sliver 15.1 to an opening roller 80, which transfers these individual fibers to a fiber feed channel 81, which feeds these fibers into a rotor 83 rotating about an axis of rotation 82.
  • a yarn 84 is formed in a manner known per se, which is drawn off by a pair of draw-off rollers 85.
  • the default ratio in the one shown with this figure Spinning machine lies between the peripheral speed of the feed roller 9, given by the speed of the geared motor shaft 21 and the peripheral speed of the take-off rollers 85, given by their speed of rotation of the take-off rollers generating the speed signal 19.1.
  • feed unit shown with FIG. 3 can be combined with the rotor open-end spinning unit shown with FIG. 30.
  • FIG. 31 shows a further application variant in which the feed element 2 feeds fibers of an opening roller 80 analogously to the feed element of FIG. 30.
  • the difference to the textile machine of FIG. 30 in FIG. 31 is that it is not a rotor-open-end spinning machine unit, but a friction-open-end spinning machine unit.
  • the feed roller 9 feeds the sliver 15.1 to the opening roller 80, which transfers the separated fibers to a fiber feed channel 86 connected to them. With the aid of this fiber conveying channel 86, the free-flying fibers are transferred to a friction spinning drum 87, on which a yarn 88 forms within a yarn formation area G, which yarn is drawn off by a pair of take-off rollers 89.
  • FIG. 31 for the sake of simplicity, only one friction spinning drum 87 is shown, but it is known per se that, as a rule, a counter drum is used in this spinning method, which is provided parallel to the drum shown.
  • FIG. 32 shows a drafting system in which a variant 2.4 of the feed means shown in FIG. 1 is used.
  • a counter roller 101 is used instead of the feed plate 10 shown in FIG. 1. This counter roller 101 forms, together with the feed roller 9, the nip.
  • the counter roller 101 is not driven, ie is freely rotating and is dragged through the fiber mat 15 lying between the counter roller and the feed roller.
  • the counter roller 101 is pivotally attached to a pivot lever 102.
  • pivot lever 102 is pivotally mounted by means of the pivot axis 11 and the bearing housing 26.
  • the load cell 41 described with FIGS. 8 and 9 is used as the measuring means for generating the signal 16. Reference is therefore made to the description for FIGS. 8 and 9.
  • roller pairs identified by reference numerals 103 and 104 are best known from drafting technology and are therefore not described further. It should only be mentioned in connection with the function of the feed means that the two lower rollers (viewed with reference to FIG. 32) of the roller pairs 103 and 104 are driven at a fixed speed, which results in the draft in the drafting system. The upper rollers of the roller pairs 103 and 104 are also dragged from the fiber mat in an analogous manner to the roller 104.
  • the draft ratio of the spinning machine shown with this figure lies between the peripheral speed of the feed roller 9, given by the speed of the Ge drive motor shaft 21 and by the peripheral speed of the lower roller 104, given by their speed generating the speed signal 19.2.
  • the signal 19.2 has the same function as the signals 19.1 in FIGS. 30 and 31 and the signal 19 in FIG. 1.
  • Another advantage is that the hysteresis inherent in the displacement measurements is eliminated in the force measurement.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
EP87118415A 1986-12-12 1987-12-11 Procédé et appareil pour égaliser la densité d'un voile de fibres à l'entrée d'une machine textile Expired - Lifetime EP0275471B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH495086 1986-12-12
CH4950/86 1986-12-12

Publications (2)

Publication Number Publication Date
EP0275471A1 true EP0275471A1 (fr) 1988-07-27
EP0275471B1 EP0275471B1 (fr) 1991-04-24

Family

ID=4285350

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Application Number Title Priority Date Filing Date
EP87118415A Expired - Lifetime EP0275471B1 (fr) 1986-12-12 1987-12-11 Procédé et appareil pour égaliser la densité d'un voile de fibres à l'entrée d'une machine textile

Country Status (5)

Country Link
US (2) US4860406A (fr)
EP (1) EP0275471B1 (fr)
JP (1) JPS63309622A (fr)
DE (1) DE3769625D1 (fr)
IN (1) IN170276B (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0289283A2 (fr) * 1987-04-29 1988-11-02 Carding Specialists (Canada) Limited Dispositif de commande de machines de cardage
US5052080A (en) * 1988-06-23 1991-10-01 Maschinenfabrik Rieter, Ag Method and apparatus for controlling yarn preparation operations to enhance product uniformity
US5121523A (en) * 1989-02-14 1992-06-16 Machinenfabrik Rieter Ag Metering method and metering apparatus for dispensing predeterminable quantities of fiber flocks
US5247721A (en) * 1990-10-16 1993-09-28 Maschinenfabrik Rieter Ag Grid for the opening roll of a spinning machine
EP0754788A1 (fr) * 1995-07-19 1997-01-22 Zellweger Luwa Ag Méthode et dispositif pour éviter des fluctuations de masse d'un matériau fibreux
EP0754789A1 (fr) * 1995-07-19 1997-01-22 Zellweger Luwa Ag Méthode et dispositif pour enregistrer la masse d'un matériau fibreux dans un métier à filer
DE19826070A1 (de) * 1998-06-12 1999-12-16 Truetzschler Gmbh & Co Kg Vorrichtung an einer Spinnereimaschine zum Herstellen eines Faserflockenvlieses, z. B. aus Baumwolle, Chemiefasern
CN112481750A (zh) * 2020-11-23 2021-03-12 舒城娃娃乐儿童用品有限公司 一种自动调节梳理密度的梳理装置

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DE3827520A1 (de) * 1988-08-12 1990-02-15 Rieter Ag Maschf Abgesaugte gleichlaufspeisevorrichtung fuer eine karde
IT1236911B (it) * 1989-12-21 1993-04-26 Marzoli & C Spa Procedimento e dispositivo di alimentazione di materiale in fibre in una macchina di preparazione alla filatura, in particolare un apritoio
DE4018803A1 (de) * 1990-06-12 1991-12-19 Rieter Ag Maschf Verfahren und vorrichtung zur regelung eines oeffnungsvorganges, beispielsweise an einer karde
US5146651A (en) * 1990-12-21 1992-09-15 E. I. Du Pont De Nemours And Company Process and apparatus for tow cross-section measurement and control
DE4200394B4 (de) * 1991-03-19 2004-12-02 Trützschler GmbH & Co KG Vorrichtung zum Reinigen und Öffnen von in Flockenform befindlichem Fasergut z. B. Baumwolle, synthetischem Fasergut u. dgl.
DE4215682B4 (de) * 1991-06-04 2004-07-22 Rieter Ingolstadt Spinnereimaschinenbau Ag Verfahren und Vorrichtung zur Korrektur des Reguliereinsatzpunktes und der Regulierintensität
US5870890A (en) * 1995-07-19 1999-02-16 Zellweger Luwa Ag Method and apparatus for detecting the mass of fiber material in a spinning machine
US5915509A (en) * 1996-04-05 1999-06-29 Maschinenfabrik Rieter Ag Method and device for regulating the sliver in a card
US6581248B1 (en) 1997-01-23 2003-06-24 Maschinenfabrik Rieter Ag Carding machine with drawing rollers at the outlet
CZ36797A3 (cs) * 1997-02-07 1998-08-12 Rieter Elitex A.S. Způsob výroby vláken a zařízení k provádění tohoto způsobu
DE59811509D1 (de) † 1997-12-23 2004-07-08 Rieter Ag Maschf Elastische Speisemulde
ITMI981618A1 (it) * 1998-07-14 2000-01-14 Marzoli & C Spa Dispositivo e procedimento equalizzatore della alimentazione delle fibre in materassino ad una carda
DE19950901A1 (de) * 1998-11-18 2000-05-25 Truetzschler Gmbh & Co Kg Vorrichtung zum Messen der Dicke und/oder der Ungleichmäßigkeit von Faserbändern
DE102004012236A1 (de) * 2004-03-12 2005-09-22 Trützschler GmbH & Co KG Vorrichtung an einer Spinnereivorbereitungsmaschine, z.B. Flockenspeiser, mit einer Speiseeinrichtung
CN101104966B (zh) * 2006-07-16 2010-12-29 苏拉（金坛）纺织机械有限公司 梳棉机棉层厚度精确采集装置
CA2901182C (fr) 2013-02-20 2019-04-02 Provo Craft & Novelty, Inc. Machine de coupe electronique
CN103966704A (zh) * 2014-05-26 2014-08-06 苏州东茂纺织实业有限公司 一种加压调节给棉装置

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GB956146A (en) * 1959-12-17 1964-04-22 Cotton Silk & Man Made Fibres Improvements in or relating to machines for the processing of fibrous material
DE2050111A1 (de) * 1969-10-15 1971-04-29 Maschinenfabrik Rieter AG, Winter thur (Schweiz) Verfahren zum Erzeugen eines gleich maßigen kontinuierlichen Faserverbandes und Vorrichtung zur Durchfuhrung des Ver fahrens
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EP0289283A2 (fr) * 1987-04-29 1988-11-02 Carding Specialists (Canada) Limited Dispositif de commande de machines de cardage
EP0289283A3 (en) * 1987-04-29 1990-04-25 Carding Specialists (Canada) Limited Controlling carding machines
US5052080A (en) * 1988-06-23 1991-10-01 Maschinenfabrik Rieter, Ag Method and apparatus for controlling yarn preparation operations to enhance product uniformity
US5121523A (en) * 1989-02-14 1992-06-16 Machinenfabrik Rieter Ag Metering method and metering apparatus for dispensing predeterminable quantities of fiber flocks
US5247721A (en) * 1990-10-16 1993-09-28 Maschinenfabrik Rieter Ag Grid for the opening roll of a spinning machine
EP0754789A1 (fr) * 1995-07-19 1997-01-22 Zellweger Luwa Ag Méthode et dispositif pour enregistrer la masse d'un matériau fibreux dans un métier à filer
EP0754788A1 (fr) * 1995-07-19 1997-01-22 Zellweger Luwa Ag Méthode et dispositif pour éviter des fluctuations de masse d'un matériau fibreux
CN1082104C (zh) * 1995-07-19 2002-04-03 泽韦格路瓦有限公司 避免在纤维材料中质量波动的方法和装置
CN1082106C (zh) * 1995-07-19 2002-04-03 泽韦格路瓦有限公司 用于在纺纱机中检测纤维材料之质量的方法和装置
DE19826070A1 (de) * 1998-06-12 1999-12-16 Truetzschler Gmbh & Co Kg Vorrichtung an einer Spinnereimaschine zum Herstellen eines Faserflockenvlieses, z. B. aus Baumwolle, Chemiefasern
US6216318B1 (en) 1998-06-12 2001-04-17 TRüTZSCHLER GMBH & CO. KG Feed tray assembly for advancing fiber material in a fiber processing machine
CN112481750A (zh) * 2020-11-23 2021-03-12 舒城娃娃乐儿童用品有限公司 一种自动调节梳理密度的梳理装置
CN112481750B (zh) * 2020-11-23 2021-09-24 舒城娃娃乐儿童用品有限公司 一种自动调节梳理密度的梳理装置

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EP0275471B1 (fr) 1991-04-24
DE3769625D1 (de) 1991-05-29
JPS63309622A (ja) 1988-12-16
US4860406A (en) 1989-08-29
IN170276B (fr) 1992-03-07
US4955266A (en) 1990-09-11

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