Abstract: An apparatus for controlling the drafting of sliver in a draw frame wherein a control arrangement generates an adjusting signal in response to sliver mass variations to correspondingly vary the sliver draft. A modifying arrangement is provided for selective manual or automatic adjustment according to any given one or more operating parameters which influence the sliver drafting, such as physical characteristics of the sliver and environmental characteristics of the textile machine, to modify the operation of the control arrangement to correct the adjusting signal and thereby to further vary the drafting of the sliver to compensate for the operating parameters.

Abstract: The apparatus comprises a compression member (T) and a measuring device arranged thereon for measuring the thickness of a fibre sliver passing through a measuring duct (4). The measuring device is formed by a leaf spring (BF) provided with resistance strain gauges. The measuring duct (4) is provided in a measuring member (MT) arranged removably on the sliver hopper (T) and the measuring member is equipped with a compressed air nozzle (19).Simple range adaptation to varying sliver numbers can thus be effected, on the one hand, and the measuring member can easily be cleaned and cooled, on the other hand.

Abstract: A fiber infeed device supplies fiber material to a textile machine, such as a card, and comprises a driven rotatable feed roll and feed plate. This roll is, however, spatially fixed, whereas the feed plate is pivotable but physically immobile during detection of the thickness and thickness variations of the infed fiber material. The feed plate can be pivoted into an operating position against a stop during throughpass of the fiber material. A substantially invariable size nipping zone is thus formed between the driven rotatable feed roll and the stationary feed plate in which a property of the throughpassing fiber material representative of its instantaneous thickness and thus variations thereof can be detected. By positionally fixing the feed plate, for instance, different forces are applied thereto in the nipping zone where the fiber material is compacted. The arising variable forces enable ascertaining thickness variations of the infed fiber material.

Abstract: For the automatic compensation of density or thickness variations of fiber material at textile machines there is measured the density of a fiber material mass fed to a fiber feed device and the density of the fiber material mass at the textile machine outlet. The resultant measurement signals are delivered to a control for regulating the rotational speed of a feed roll of the fiber feed device in accordance with both measured density signals. The fiber feed device comprises the feed roll and a coacting feed plate. The feed roll, although rotatable, is spatially stationary and is pivotal from a starting position in the absence of the fiber mass into an operative position into contact with an abutment when there is present a fiber mass whose density variations are to be detected. By positionally fixing the feed plate during the detection operation different forces arise, depending upon the thickness or density of the fiber mass, in the nipping zone between the feed roll and the feed plate.

Abstract: Apparatus for sensing the amount of fibers fed to a textile carding machine is disclosed which includes a feed roll (10) affixed to the frame of the carding machine for feeding fibers through a nip (26) between the feed roll and a feed plate (24). A rotational drive (B) is affixed at a free end of a feed roll shaft (40) in a free manner relative to the carding machine frame. Reaction force sensor (C) is mechanically coupled between rotational drive (B) and carding machine frame (12). Sensor means (C) senses the reaction forces on the rotational drive caused by the torque of feed roll (10) during feeding of fibrous mass (F) through nip (26). Sensor (C) includes a displaceable torque arm (50) and a sensor member (56). Sensor (56) senses the displacements of torque arm (50) which is affixed to rotational drive (B).

Abstract: The present invention relates to a method and an apparatus for controlling the drafing of sliver in a draw frame in which sliver first travels through an advance sensing means that senses variations in the mass, then passes through a drafting means which is located after the advance sensing means and is provided with an adjustable draft, and finally travels through an after sensing means located after the drafting means which senses the mass per unit of length, whereby the draft of the drafting means is varied to compensate for variations in mass of sliver in response to the sensed variations in mass evaluated in a time-delayed manner and of the difference of the measured mass per unit length of the output and of a selectable theoretical value for the mass per unit of length.

Abstract: An apparatus for levelling the thickness of a running fiber lap fed to a textile fiber processing machine, includes a feed roller having a generally horizontal longitudinal axis and a feed table cooperating with the feed roller by defining therewith a nip through which the fiber lap passes. The fiber processing machine further includes a motor connected with the feed roller for rotating the feed roller, a lap thickness measuring device including a sensor element cooperating with the feed roller and undergoing excursions in response to thickness variations of the fiber lap runing between the feed roller and the sensor element and a control device connected to the measuring device for receiving signals representing the excursions. The control device is connected to the motor for applying rpm control signals thereto as a function of the thickness variations.

Abstract: A carding machine includes a licker-in and a main carding cylinder cooperating therewith; a feed roller arranged immediately upstream of the licker-in as viewed in a direction of material feed into the carding machine; and a feed table cooperating with the feed roller for advancing fiber material to the licker-in. The feed table is arranged for executing excursions towards and away from the feed roller as a function of the material quantity passing between the feed roller and the feed table and a measuring device operatively connected with the feed table for generating signals representing the excursions. There is provided a motor connected to the feed roller for rotating the same. The motor receives setting signals as a function of the excursions. The feed table has a movable first part operatively connected with the measuring device and a second part situated between the movable first part and the licker-in.

Abstract: An apparatus in combination with a carding machine and a regulatable tuft feeding device for evening a running sliver produced by the carding machine. The assembly has a fiber-handling roller forming part of the carding machine, a motor drivingly connected to the roller, an rpm-setting device connected to the motor, a desired value setter connected with the regulatable tuft feeding device; a measuring device for determining momentary values of mass of the running sliver; a regulator connected to the measuring device and to the rpm-setting device for controlling the rpm of the roller as a function of the sliver mass sensed by the measuring device. There is further provided a limit value indicating device connected to the rpm-setting device for responding to predetermined setting limits.

Abstract: A method of feeding a plurality of fiber processing machines with fiber tufts, including the steps of pneumatically advancing fiber tufts by a conveying fan within a first tuft confining device into a second tuft confining device associated with respective fiber processing machines; compressing the tufts in each second tuft confining device by a compressing air stream whereby a compressed tuft column having a height level is obtained in each second tuft confining device; and measuring and regulating the pressure in at least one of the tuft confining devices. The first tuft confining device comprises a tuft conveying duct and the second tuft confining devices are formed of tuft collecting chutes.

Abstract: An apparatus for evening a fiber lap fed to a carding machine. The latter has a licker-in, a feed table and a feed roller cooperating with one another in feeding the fiber lap to the licker-in; a drive motor connected to the feed roller; and an arrangement providing for a relative movement of the feed roller and the feed table towards or away from one another as a function of the thickness of the fiber material passing therebetween. There is further provided an excursion measuring device for generating signals representing the magnitude of the relative movement; and a control device connected to the excursion measuring device. The control device is connected to the drive motor for regulating the rpm of the feed roller as a function of the relative motion between feed roller and feed table. A delay device is connected between the excursion measuring device and the control device for delaying transmittal of signals from the excursion measuring device to the control device.

Abstract: An apparatus which feeds a fiber lap to a fiber processing machine has a reserve chute connected to a pneumatic fiber tuft conveying duct to receive fiber tufts therefrom; a feed chute connected to the reserve chute; a feed roller arranged for advancing fiber tufts from the reserve chute into the feed chute; a drive for rotating the feed roller; an arrangement for delivering a compressing air stream into the feed chute for densifying a fiber tuft column therein; a plurality of air outlet openings to provide a passage of the air stream out of the feed chute; a pressure sensor situated in the feed chute; a pressure regulator connected with the pressure sensor and the drive for altering the rpm of the feed roller as a function of the pressure prevailing in the feed chute.

Abstract: A method and apparatus are disclosed primarily for measuring the linear density of a sliver of fibrous strands (e.g. textile) as they are drawn through a trumpet on a processing machine. The measurement is made by detecting the naturally occurring acoustic emissions or signals generated by the frictional and compressive forces between the fibers and between the fibers and the wall of the trumpet as the sliver is drawn through the trumpet. The intensity of the acoustically emitted signal is proportional to the density of the sliver passing through the trumpet. These acoustic emissions are detected by a microphone which convert the acoustic signals to an electronic signal which is amplified and electronically processed to indicate the density of the sliver and may be used to control the textile machine and furnish diagnostic data.

Abstract: A yarn making machine assembly includes a yarn spinning chamber; a feed table adapted to support a silver thereon; a feed roller having a periphery defining, with the feed table, a clearance through which the sliver is adapted to pass; an rpm-variable motor connected to the feed roller for rotating it to advance the sliver; an opening roller arranged adjacent the clearance to receive the sliver and to break it up into fibers; a sliver thickness sensor including the feed roller and/or the feed table to execute excursions in response to thickness variations in the sliver running through the clearance; a device for generating an electric signal as a function of the excursions; a regulator for receiving the electric signal and for emitting a setting signal as a function of a difference between desired and actual thickness values of the sliver; and a device for applying a signal, representing the setting signal, to the motor for varying the rpm thereof to thus alter the rotational speed of the feed roller, whereby

Abstract: An apparatus for regulating the rpm of the feed roller of the tuft feeder and having an rpm measuring device connected to at least one card roller for generating a first signal representing an operational magnitude of the card roller; a signal generating device connected to an output of the rpm measuring device and arranged for generating a second signal as a function of the first signal; a pressure sensing device for sensing pressure in the feed chute and for generating a third signal representing the pressure; a regulator connected to an output of the pressure sensing device and arranged for generating a fourth signal as a function of the third signal; and an integrating device connected to an output of the signal generating device and an output of the regulator for receiving the second and fourth signals and emitting a fifth signal as a function of the second and fourth signals. The integrating device is connected to the output amplifier for applying the fifth signal thereto.

Abstract: An apparatus includes a fiber tuft feeder with discharge rollers for delivering a fiber tuft mass; a drive motor connected to the discharge rollers; a feeding device arranged for advancing fiber material obtained from the tuft feeder; and a textile processing machine having an input arranged to receive fiber material from the feeding device. An opening roller forms part of the tuft feeder and is arranged downstream of the discharge rollers for receiving fiber material from the discharge rollers and to advance fiber tufts. Devices produce a loose fiber tuft mass from the fiber tufts delivered by the opening roller, form a thin fiber lap from the loose mass and advance the fiber lap to the feeding device. A sensor is situated upstream of the textile processing machine for detecting fluctuations in quantity characteristics of the advancing fiber lap, and a transducer is connected to the sensor for generating electric signals representing the fluctuations.

Abstract: A spinning machine, especially a drawing frame comprising at least a pair of feed rollers provided at a fiber working portion for carding at least one sliver and for feeding said sliver to be carded and drafted, at least one first motor for driving said feed rollers, at least a pair of front rollers for drawing out and feeding said sliver just carded at the fiber working portion, at least one second motor for driving the front rollers, and an electronic rotation control unit for controlling the rotations of the two different motors so as to synchronize the rotation of the first motor with the rotation of the other motor, i.e. the second motor and to be equal to a predetermined set rotational speed ratio. With this construction according to the present invention, gear change can be dispensed with when modifying the draft rate, and the change of the draft rate can be promptly performed.

Abstract: A control system and method for controlling the rate (Y) of fiber input (24) into a delivery system (28) in response to sensed fiber quantity (56) is disclosed. The control system generates a step control signal (C,D) in response to first deviations about a prescribed fiber quantity condition (1 or 1,2). Deviations of small magnitude caused by various fiber delivery conditions, i.e. fiber opening, duct friction, etc., are taken into account without overreacting to the variation. In response to deviations outside the range of the first deviations, an integrated ramp signal (E, F or 128, 124) is produced which automatically seeks a new level of fiber input rate. Such deviations are normally caused by changes in system requirements such as the changing consumption and production requirements of an associated carding machine (48) to which fibers are fed from a chute feed (42).

Abstract: A rapidly reacting measuring element is used at the delivery of the drafting zone on autolevelling drawframes used in the textile industry, which makes it possible to superimpose on the signal thus obtained from the measuring element by means of an electronic system a further measurement signal at the delivery of the drawing passage and thus correct the parameters governing the drafting values in such a way that even short-term variations in cross-section of the textile material are levelled out. The critical factors here are especially the delay time T of the textile material between the correcting element (pair of drafting rollers with variable speed of rotation) and the measuring element and also the overall amplification V of the measurement signal.

Abstract: An arrangement for continuously determining the density of an elongated strip-shaped web of fiber sliver in the course of a spinning process in order to generate control signals for use in controlling the operation of machine elements operative for equalizing the distribution of the fiber sliver includes two of stepped rollers which together delimit, at a their nip region, a confining space for the passage of the fiber sliver web therethrough. One of the rollers is mounted on a support for rotation about a stationary axis and is driven in rotation, while the other roller is mounted on the support for free rotation about another axis which is parallel to the stationary axis and defines an imaginary plane therewith, as well as for movement along the imaginary plane against a spring force away from the one roller, so that the fiber sliver is compressed and moves the other roller to a greater or lesser degree away from the one roller as it passes through the confining space, depending on its density.

Abstract: Apparatus for monitoring the amount of tobacco particles being conveyed in a stream thereof, is disclosed. The apparatus comprises a freely rotatable roller with surface ribs extending across the conveyor. The roller is supported by a counter balance arm fastened upon a pivot and concentric with a transducer responsive to angular rocking motion of the pivot due to changes in the depth of the stream. Movement of the roller towards the conveyor is limited by an adjustable stop, engageable by the arm. A detector senses movement of the roller movement and generates a signal indicative of the amount of tobacco being conveyed. The feed rate of the tobacco may be adjusted in response to the signal from the detector.

Abstract: An apparatus used in combination with a yarn spinner has an upstream gripper roller assembly including at least an upstream roller pair gripping the yarn to be stretched, a downstream gripper roller assembly including at least a downstream roller pair spaced from the upstream pair and also gripping the yarn, and respective variable-speed drives connected to the upstream and downstream pairs for rotating same at respective slow downstream and fast upstream speeds and thereby passing the yarn from the downstream to the upstream pair while stretching it. Respective upstream and downstream sensors juxtaposed with the yarn adjacent the upstream and downstream roller pairs measure the yarn size and respective upstream and downstream controllers connected to the respective sensors and drives rotate the respective roller pairs at speeds dependent on the respective detected yarn sizes.

Abstract: A fibre metering arrangement comprises a supply conveyor carrying fibre to a weighplate, and a nip roller arrangement removing the fibre from the weighplate, and being sufficiently spaced from the weighplate so as not to cause the fibre to accumulate over the weighplate. If the gap is such that some fleece might sag, a bridging plate or a take-off conveyor can be inserted. Preferably, there is a draft between the supply conveyor and the take-off conveyor or nip rollers.

Abstract: Device for the determination of the amount of substance or the density of fiber structures, which utilizes the elastic properties of the fiber material. By means of a sphere which is positioned in a conical opening in a duct through which the fibers pass and which presses on the fibers with a part of its surface, a nozzle is throttled, so that the pressure on the nozzle represents a measure for the force on the sphere. This pressure is in a definite relationship to the fiber pressure on the sphere and can be measured with a pressure measuring device and transformed into an electrical signal by means of a normal commercially-available converter. A small groove in the wall of the duct behind the sphere avoids the attachment of fibers between the sphere and the opening.

Abstract: A method of regulating fiber quantities supplied to a fiber processing machine of a fiber processing line. The latter includes a fiber storing apparatus connected downstream of the fiber processing machine and receives processed fiber therefrom. The fiber processing machine includes a feed roller supplying fiber thereto. The method comprises the following steps: continuously rotating the feed roller by a regulatable drive during operation of the fiber processing line; generating a measuring value representing momentary fiber quantities in the storing apparatus; generating an analog electric signal representing the measuring value; and applying the analog electric signal to the regulatable drive of the feed roller for varying the rpm thereof as a function of the fiber quantity in the storing apparatus.

Abstract: An electronic control system for a machine which forms fiber material into a length of silver which is delivered into a storage can, and which includes a carding cylinder, a feed roller for supplying fiber material to the cylinder, a doffer for removing a web of carded fibers from the cylinder and means for removing the carded fibers from the doffer and forming them into the length of fibers. The system includes monitoring devices for monitoring the operation of the machine, controllable regulator devices connected for controlling the operating speed of at least one of the doffer and feed roller, and a microcomputer connected to the monitoring devices and the regulator means for controlling the regulator devices.

Abstract: An apparatus for making a web of fibers has an upright and horizontally elongated supply duct having an upper end, an open lower end, and a foraminous side wall. Fibers are fed to the upper end of the supply duct so that they descend in this duct as a ribbon-shaped web. An upright and horizontally elongated forming duct has an upper end receiving the fiber web from the supply duct, a lower end, and a foraminous side wall. Gas is made to flow down in the ducts and through the foraminous side walls thereof to shape the web and advance it to the respective lower ends. Rollers are provided at the lower end of the forming duct for withdrawing the web therefrom. One or more sensors measure the thickness of the web at a plurality of sensing locations spaced transversely along the web downstream of the lower end of the forming duct. Respective individually operable flow-adjusting means can vary the gas flow in one of the ducts at respective zones spaced transversely across the web like the sensing locations.

Abstract: A draw frame of a sliver-drafting apparatus has three cascaded roller pairs whose lower rollers are driven by respective motors at speeds determined by associated frequency dividers and/or multipliers in the output of a common oscillator of adjustable operating frequency. The slivers drafted by the roller pairs form, after doubling or plying, a fiber bundle traversing a thickness sensor whose output, integrated over predetermined time periods, is used by a microcomputer to ascertain optimum nip-line spacings and contact pressures reducing the thickness variations to a minimum.

Abstract: Method and apparatus for processing textile materials and, in particular, controlling the density of fiber in a carding system. A fiber feeder is provided which includes a blower and an oscillating plate, both of which act to compress fiber collected in the chute of the fiber feeder. A first sensing device is utilized at the discharge of the fiber feeder to sense the density of the batt being fed therefrom to a card, and a second sensing device is utilized at the trumpet of the card to sense the density of the fiber which forms the sliver in such trumpet. Control means is provided to regulate the operating speed of the blower and the oscillating plate in response to the signals generated by the first and second sensing devices.

Abstract: An apparatus for regulating fiber quantities supplied to a textile machine as a fiber layer, comprises a sensor device for mechanically sensing thickness variations of the fiber layer at a plurality of locations along the layer width and emitting individual mechanical signals representing the magnitude of thickness variations at each location, a transducer arrangement connected to the sensor device for converting each individual mechanical signal into an individual electric signal, a signal adder connected to the transducer arrangement for combining the individual signals into a joint electric signal, a regulator arrangement connected to the signal adder for comparing the joint electric signal representing an actual value with a predetermined desired value of fiber layer thickness for generating a setting signal, a fiber layer delivery device, and a setting device connected to the regulator arrangement and the fiber layer delivery device for controlling the setting device by the setting signals, whereby fiber

Abstract: An apparatus used in combination with a yarn spinner has an upstream gripper roller assembly including at least an upstream roller pair gripping the yarn to be stretched, a downstream gripper roller assembly including at least a downstream roller pair spaced from the upstream pair and also gripping the yarn, and respective variable-speed drives connected to the upstream and downstream pairs for rotating same at respective slow downstream and fast upstream speeds and thereby passing the yarn from the downstream to the upstream pair while stretching it. Respective upstream and downstream sensors juxtaposed with the yarn adjacent the upstream and downstream roller pairs measure the yarn size and respective upstream and downstream controllers connected to the respective sensors and drives rotate the respective roller pairs at speeds dependent on the respective detected yarn sizes.

Abstract: A regulating apparatus for obtaining a uniform sliver delivered by a carding machine includes an rpm setter connected to a roller drive of the carding machine for determining an operational speed for the drive, a signal generator for producing a first signal as a function of actual properties of the sliver and a PI-regulator having a component determining a regulating time constant. The PI-regulator is connected to the signal generator for receiving the first signal and for generating a second, regulating signal. Further, the PI-regulator is connected to the drive for applying the second signal thereto. A regulating time constant setter is operatively connected to the component which determines a regulating time constant. The rpm setter and the regulating time constant setter cooperate for adjusting the regulating time constant setter as a function of adjustments of the rpm setter, whereby the regulating time constant of the PI-regulator is varied as a function of the rpm of the fiber-engaging roller.

Abstract: Apparatus for forming fiber material into a length of sliver.

Abstract: A draw frame of a sliver-drafting apparatus has three cascaded roller pairs whose lower rollers are driven by respective motors at speeds determined by associated frequency dividers and/or multipliers in the output of a common oscillator of adjustable operating frequency. The slivers drafted by the roller pairs form, after doubling or plying, a fiber bundle traversing a thickness sensor whose output, integrated over predetermined time periods, is used by a microcomputer to ascertain optimum nip-line spacings and contact pressures reducing the thickness variations to a minimum.

Abstract: A cotton ginning system embodying a lint cleaner in which the batt of cotton delivered to the lint cleaner is maintained at an optimum thickness even though the rate of ginning varies. The batt thickness is maintained by correlating the same with the rate of feed of seed cotton to the system. Controls are provided to assure that the batt remains at optimum thickness, and such optimum thickness is assured by sensing the rate of input of seed cotton to the system.

Abstract: A regulation of the density of the fibre clothing on cards, carding engines and the like is described which is based on measuring the torque which has to be used for the drive of the licker-in or the cylinder. The signal corresponding to this torque is compared with a desired value which is either arbitrarily adjustable or is obtained from a sliver count measuring member or constitutes a combination of the two.The torque is either measured by measuring the power consumption for the drive of the licker-in and/or the cylinder, or by measuring the torsion of a torsion shaft, or by measuring the slip occurring in a variable coupling.

Abstract: A cotton ginning system embodying a lint cleaner and a process of operating the same in which the batt of cotton delivered to the lint cleaner is maintained at an optimum thickness even though the rate of ginning varies. The batt thickness is maintained by correlating the same with the rate of feed of seed cotton to the system. Controls are provided to assure that the batt remains at optimum thickness, and such optimum thickness is assured by sensing the rate of input of seed cotton to the system.

Abstract: In a pneumatic system for supplying air-borne fibers to the vertical feed chutes of carding machines and the like, the fibers which collect in the lower, formation section of each chute, are adapted to be compacted by a volumetric air pump that is mounted in each chute to direct pulses of compressed air into the upper end of its formation section. The density of the column of fibers in this section is monitored by apparatus which senses the air pressure differential between the upper and lower ends, respectively, of the formation section, and which generates an electrical signal proportionate to the pressure differential. This signal controls the operation of the variable speed electric motors which drive the air pump and a feed roll, which draws fibers from the upper, surge section of the chute and feeds them downwardly to the formation section.

Abstract: A vertical feed chute includes a feed roll for feeding fibers from a surge section in its upper end to a formation section in its lower end. A stationary, perforated condenser plate is secured to the lower, discharge end of the chute, and has thereon a concave surface which extends beneath the chute discharge opening, and beneath a metering roll that is mounted to rotate in the discharge opening in confronting relation to the condenser plate. A mat of fibers is drawn from the discharge opening into a nip between the condenser plate and metering roll where the mat is compressed and then fed to the input of a carding machine, or the like. The metering roll is mounted for limited reciprocable movement normal to its axis, and toward and away from the concave condenser surface. In one embodiment the roll is positively driven by pneumatic means toward or away from the concave surface depending upon the density of the mat entering the nip.

Abstract: For controlling the output and the silver density in a carding machine, lot-specific data are determined, then fed into a memory from which the data may be recalled at will and applied to the control of the carding machine.

Abstract: A control system for use in textile processing equipment including a card and a chute feed delivering a batt of fiber thereto. The operating speed of the card is sensed to generate a signal that is used to drive the motor for the oscillating densification plate and the feed roll of the chute feed at speeds having a predetermined ratio of the operating speed of the card. The weight of the batt formed by the chute feed is sensed and a signal is generated in proportion to the sensed weight, and this signal is used to override the primary drive for the oscillating plate and thereby vary the ratio between the operating speed of the card and speed of oscillation of the plate. The chute feed includes a device for sensing the level of accumulated fiber in the chute feed, and this device generates a signal that is utilized to override the primary drive for the feed roll of the chute feed and thereby vary the ratio between the operating speed of the card and the speed of such feed roll.

Abstract: An autolevelling drawframe for levelling out staple fibre slivers in the spinning mill operation, in which deviations of the sliver weight (linear density) from the preset desired value detected are processed into correcting signals and are transmitted to a correcting member, which adapts the input speed of the drafting arrangement. The correcting signal transmitted is generated from the product of a voltage proportional to the rotational speed of the main motor and a voltage determined by the deviation in linear density. The apparatus consists of a computer (34,41; 60,41; 67,71) for computing the correcting signal, which computer is connected electrically with the correcting member (48), with a transducer (20) transmitting the voltage proportional to the rotational speed of the main motor, and with means for generating the voltage determined by the deviation in linear density. The computer can consist of a control device (36) and a multiplicator (41) or of a microprocessor (71) (digital computer).

Abstract: An electric pressure switch for use with textile machines and the like has a U-shaped tube filled with a liquid. One of the legs is above the liquid level in communication with a source of variable fluid pressure, for example a fiber feeding chute of a textile machine and this same leg, with the other leg, is provided with two or more vertically spaced detecting arrangements which detect changes in the position of the liquid level which occur as the fluid pressure fluctuates, and such detections are converted into electrical signals which can control various functions, such as the drive for fiber feeding devices or the like.

Abstract: In a fiber tuft feeding apparatus the throughgoing tuft quantities are sensed, signals representing such quantities are emitted and in response to the signals, a tuft quantity metering member, such as a feeding roll is controlled by analog setting signals.

Abstract: An open loop control system is disclosed for controlling the production of a web or sliver on a carding machine so as to have a uniform weight per unit length. A novel sensing arrangement for the card input is disclosed wherein corrections to the input are made at the same mechanical plane and point in the feeding process as where the input is sensed to provide highly accurate control of the weight of the output.

Abstract: A device for obtaining a control signal corresponding to the density of the fibre covering lying on a fibre carrying element such as the cylinder, the licker-in, the take-off roller, or the doffer of a card. The device includes a holder which extends over the width of the fibre carrying element to span the width of the fibre covering on the fibre carrying element. This holder contains means responsive to the density of the fibre covering which produces electric output signals corresponding to the density of the fibre covering.

Abstract: A method of and apparatus for regulating out variations in the sliver weight on processing machines such as cards, carding engines, draw frames and the like wherein a first measuring device measures either the absolute cross-section or the relative variations of cross-section relative to a predetermined fixed desired value of a fibre sliver issuing from the machine. The first measuring device forms a corresponding first test signal. An additional measuring device is arranged at a point upstream of the first measuring device with respect to the direction of travel of the fibre material. The additional measuring device produces a second test signal corresponding to the relative variations in the cross-section of the fibre material relative to an average value for these variations formed over a predetermined period. The first and second test signals are used for controlling at least one regulating device which controls the cross-section of the fibre sliver.

Abstract: This invention relates generally to textile carding machines, and is concerned in particular with an apparatus for weighing a condensed fiber lap feeding through a pair of compressor rolls to a pair of feeding rolls in a carding machine.

Abstract: In the production of a card sliver in a textile fiber carding machine, the rate at which fibers are fed to the machine is continuously measured and deviations in the measured rate from a desired value are utilized to vary the rate at which fibers are being supplied to the machine.

Abstract: The draft imparted to sliver during regular operation of a sliver drafting apparatus is correctively varied in proportion to uniformity variations then detected in the sliver. During at least part of each period of start-up of the apparatus, the sliver is subjected to a prescribed correction draft approximately equal to an average of the draft corrections applied to the sliver over a relatively long time interval during the last-ensuing regular operation of the apparatus. During that initial part of each start-up period required for the apparatus to accelerate to substantially full operating speed, the prescribed correction draft is either not applied or, alternatively, is scaled in proportion to the speed of the apparatus.