US3449899A - Variable count and slubbing apparatus and method - Google Patents

Variable count and slubbing apparatus and method Download PDF

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US3449899A
US3449899A US709543A US3449899DA US3449899A US 3449899 A US3449899 A US 3449899A US 709543 A US709543 A US 709543A US 3449899D A US3449899D A US 3449899DA US 3449899 A US3449899 A US 3449899A
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signal
signals
drafting
varying
instrumentalities
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Francis M Cureton
Jackson L Mcmanus
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ELECTRO MATIC CORP
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ELECTRO MATIC CORP
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/32—Regulating or varying draft
    • D01H5/36—Regulating or varying draft according to a pre-arranged pattern, e.g. to produce slubs

Definitions

  • Certain desirable elfects such as novel visual appearances and characteristics of hand, may be achieved in a woven fabric or other end textile product by the use of novelty yarn, such as slub yarn having a varying diameter or thick and thin portions along the length thereof.
  • a fabric constructed with such yarn may have more of an appearance of being manufactured by hand and is, in any event. preferably characterized by a random distribution of the yarn size variations or slubs which impart the novel appearance and hand to the fabric.
  • a repeating pattern of the slubs across the surface of the fabric is undesirable as detracting from the other desirable qualities being sought.
  • the more uniform the distribution of the slubs along the length of a novelty yarn and the shorter the length of the yarn in which this distribution repeats the higher the likelihood that a repeating pattern of distribution of effects in the fabric will appear.
  • the apparatus used typically utilizes drafting instrumentalities to form the novelty yarn with at least front and rear spaced apart sets of drafting instrumentalities being driven at different speeds to effect the drafting action.
  • the rear set of drafting instrumentalities is driven at a uniform speed by the front set of drafting instrumentalities during fromation of the base yarn by a suitable operative connection therebetween.
  • an overrunning clutch is employed in the operative connection between the rear and front sets of drafting instrumentalities and a secondary drive means is provided to overspeed the rear set relative to the normal speed of rotation thereof and thereby form the thickened portion or slub.
  • a novelty yarn of the type produced in such an apparatus thus has a base yarn of uniform diameter or count and slubs of uniform diameter but varying length interspersed along the length of the novelty yarn.
  • the apparatus of this invention comprises controllable variable speed drive means operatively connected to a rear set of drafting instrumentalities to drive the same entirely independently of an astherefrom, to control the feed of a textile strand into the drafting zone defined between the sets of drafting instrumentalities entirely independently of the speed at which the front set of drafting instrumentalities delivers the drafted yarn therefrom.
  • the method contemplated by the present invention comprises the steps of generating a randomly varying signal and applying the signal to control the speed of a rear set of drafting instrumentalities entirely independently of the speed of a front set of drafting instrumentalities spaced therefrom.
  • a more specific object of this invention is to provide, in conjunction with a textile spinning frame for drafting fibrous textile strands passing therethrough, a method of and means for driving a rear set of drafting instrumentalities at randomly varying rates to randomly vary the base count and slub characteristics of a textile yarn being delivered from the spinning frame.
  • means are provided for generating randomly varying signals and a control means is operatively connected to the signal generating means for combining a plurality of randomly varying signals to create a drive signal of randomly varying magnitude.
  • Such drive signal is then applied to a controllable variable speed drive means, to drive the rear set of drafting instrumentalities entirely independently of the front set and result in the delivery by the front set of drafting instrumentalities of a yarn having randomly varying count and slub characteristics.
  • Yet another more detailed object of the present invention is the provision of an apparatus and method wherein a plurality of inversely varying signals and an intermittent signal are generated and the signals are then combined to create two randomly varying signals, one of which is a continuous, randomly varying signal and the other is an interrupted, randomly varying signal.
  • the two randomly varying signals are then combined to create a single drive signal of varying magnitude wherein the magnitude of the drive signal is determined by the greater of the magnitudes of the continuous, randomly varying signal and the interrupted, randomly varying signal.
  • the rotational speed of a rear set of instrumentalities is then controlled in accordance with the resulting drive signal.
  • the apparatus of the present invention as briefly discussed above, it not only capable of obtaining the randomization of yarn characteristic desired in most instances, but may be adjusted through a much wider range than heretofore possible, so that patterned yarns of a wide range of preprogrammed characteristics may be produced thereby.
  • an apparatus and method of producing novelty yarns of random or preprogrammed patterned characteristics are provided.
  • FIGURE 1 is a schematic representation of an apparatus contemplated by the present invention
  • FIGURES 2 through 8, taken together, are a circuit diagram of an operating embodiment of an apparatus as schematically represented in FIGURE 1 and wherein FIGURE 2 is a circuit diagram of a power supply means for providing electrical current to certain signal generators which form portions of the apparatus schematically illustrated in FIGURE 1;
  • FIGURE 3 is a circuit diagram of a mechanical randomizer which forms a portion of the apparatus schematically illustrated in FIGURE 1;
  • FIGURE 4 is a circuit diagram of certain signal generators which form portions of the apparatus schematically represented in FIGURE 1;
  • FIGURE 5 is a circuit diagram of certain signal integrating means which form a portion of the apparatus schematically illustrated in FIGURE 1;
  • FIGURE 6 is partly a circuit diagram and partly a schematic illustration of a selection means for facilitating production of a plurality of varying types of yarn on a single spinning frame;
  • FIGURES 7, 7a and 8, taken together, are a circuit diagram of a motor speed control means forming a portion of the apparatus schematically illustrated in FIG- URE 1.
  • FIGURE 1 includes block diagram representations of certain portions of an apparatus as contemplated by the present invention and illustrates also a plurality of spaced apart sets of drafting instrumentalities, represented as the roll sets 11, 12 and 13, defining drafting zones therebetween.
  • the roll sets 11, 12 and 13 represent the front, intermediate and rear drafting instrumentalities of a conventional spinning frame, with the front set 11 delivering a textile strand material or yarn to the spindle of the spinning frame and the rear set 13 feeding textile strand material, such as roving, into the drafting zones to be drafted.
  • the intermediate set of drafting instrumentalities 12 may be present or omitted as found desirable for each particular installation.
  • the front set of drafting instrumentalities 11 preferably is driven in a conventional manner as widely known in the construction of spinning frames.
  • a controllable variable speed drive means is connected to the rear set of drafting instrumentalities 13 independently of the front set 11 for driving the rear set 13 independently thereof.
  • the controllable variable speed drive means preferably comprises a direct current electrical motor 15, operatively interconnected with the rear set 13 of drafting instrumentalities by means of any suitable connection, such as a driving belt 16.
  • a tachometer generator 18 Also operatively connected to the shaft of the variable speed motor 15 is a tachometer generator 18, the function of which will be brought out more fully hereinafter.
  • reference to driving the rear set of drafting instrumentalities independently of the front set is not intended to convey that the relative speeds of rotation are not correlated, for such correlation is necessary if desirable predictability is to be obtained as to the yarn produced. It is intended that the drive means provided for the front and rear sets of instrumentalities be separate and that the rotative speed of the front set not necessarily be changed. However, for correlation of twist and draft, it may be desirable to also control the front drafting instrumentalities speed in relation to the control of the rear drafting instrumentalities speed.
  • the speed of the electrical motor 15 is controlled by a DC motor controller 19, to which is applied a drive signal 20 of randomly varying magnitude (represented by a signal envelope designated at 20 in FIGURE 1) so as to result in varying speed being imparted to the rear set 13 of drafting instrumentalities.
  • the drive signal 20 is created by a slub and body yarn signal integrator 21 which receives first and second randomly varying signals 22 and 23 (respectively represented by signal envelopes also designated 22 and 23) and combines them to create the drive signal 20.
  • One of the randomly varying signals is discontinuous or interrupted, such as signal 22, and is produced by a slub signal integrator 25 which receives a plurality of signals (variously represented by signal envelopes A, A, B, B and C) generated by first and second slu-b signal generators 26 and 27 and by a mechanical randomizer 29.
  • the other randomly varying signal 23 is generated in a somewhat similar manner by a body yarn signal integrator 30 receiving pairs of signals (represented as D, D, E and E) generated by first and second body yarn signal generators 31 and 32.
  • FIGURES 2 through 8 disclose the details of an operating embodiment of the present invention which func tions to control the rears sets of drafting instrumentalities in a plurality of zones of a spinning frame or spinning frames, as for example ten zones. In a normal application, each such zone is two sides of a spinning frame.
  • the operating embodiment of the present invention includes a mechanical randomizer (FIG- URE 3) corresponding to an identified by the same reference as the mechanical randomizer 29 of FIGURE 1.
  • Suitable elements for the mechanical randomizer 29 include an appropriate electrical motor 60 which may be operatively connected to a source of line voltage such as volts through appropriate switch means and fuses, as is generally known.
  • each of the rondomizer discs Operatively associated with each of the rondomizer discs are a plurality of electrical switches, such as microswitches, which are operated by projections or cam fingers carried by the respective discs.
  • the cam fingers are displaceable about the discs, and cooperate with the positioning of the switches about the discs to cause completion of an electrical circuit and passage of an electrical signal in a pattern which approximates a random sequence of signals.
  • the intermittent signal thus developed by the mechanical randomizer 29 is applied to a slub signal integrator as pointed out more fully hereinafter with reference to the discussion of the circuits of FIGURE 5.
  • a slub signal integrator as pointed out more fully hereinafter with reference to the discussion of the circuits of FIGURE 5.
  • the intermittent voltage signal resulting from actuation of three switches 61, 62 and 63 appears on a conductor 65.
  • Power supplies Electrical current to be modulated to generate the various pairs of inverse signals is derived from a pair of regulated voltage supplies, each enclosed within dash lines in FIGURE 2 and respectively identified as 50 and 51.
  • Unregulated direct current is tapped from the secondary winding of a transformer T1 through a rectifier bridge and is regulated by a network of resistors, capacitors, diodes and transistors of a type which is generally known for regulating direct current supplies.
  • An unregulated voltage supply of predetermined potential, such as 10-volts, and a common ground are provided by the secondary winding of a second transformer T2.
  • the first regulated power supply 50 applies a regulated direct current of predetermined potential, such as -volts, to a conductor 52, which is operatively connected to a plurality of signal generators (FIGURE 4) corresponding to and identified by the same numerals as the signal generators 26, 27, 31 and 32 (FIGURE 1) for modulation of the current to produce pairs of inversely varying signals such as those represented in FIGURE 1 as the signals A and inverse A; B and inverse B; D and inverse D; and E and inverse E.
  • a regulated direct current of predetermined potential such as -volts
  • Direct current from the second regulated power supply 51 is supplied at a predetermined potential, such as 25 volts, through a conductor 53 to integrator circuits (FIGURE 5) corresponding to and identified by the same numerals as the slub signal integrator 25 and the body yarn signal inte grator (of FIGURE 1). Additionally unregulated direct current is supplied through a conductor 55, to be applied to the integrator circuits (FIGURE 5).
  • a common ground for return is provided by a conductor 56.
  • FIGURE 4 Signal generators Circuit details of the signal generators 26, 27, 31 and 32 as included in the operating embodiment of the present invention are as shown in FIGURE 4.
  • the four circuits there illustrated as enclosed within dash lines and identified by the reference numerals 26, 27, 31 and 32 are all substantially identical, being hybrid timing circuits arranged as unsymmetrical multivibrators wherein a unijunction transistor is used in conjunction with a pair of conventional PNP transistors for timing the changes in conductive state of such transistors.
  • the signal generator enclosed within dash lines and identified as the first slub signal generator 26 includes a unijunction transistor 26a. which operates as a timing control over the changes in conductive state of a flip-flop circuit using a pair of PNP transistors 26b and 26c.
  • a pair of electrical conductors 80 and 81 are operatively connected in the collector circuits of the flip-flop transistors 26b and 26c, to serve as outputs from the signal generator 26 and carry a pair of inverse signals such as are represented by the signal envelopes A and inverse A in FIGURE 1.
  • the signal generators enclosed within dash lanes identified as the second slub signal generator 27 and the first and second body yarn signal generators 31 and 32 include circuit components identified by designations corresponding to those used with reference to the first slub signal generator 26 and similarly modulate electrical current derived from the power supply 50 to cause pairs of inverse signals to appear on respectivesets of conductors.
  • signals identified as B and inverse B appear on the conductors 83 and 84.
  • signals identified as B and inverse B appear on conductors 85 and 86, operatively connected to the first body yarn signal generator 31, appear the signal D and inverse D.
  • the operative connection of conductors 88 and 89 with the second body yarn signal generator 32 conducts therefrom the signals E and inverse E.
  • Slab signal and body yarn signal integrators The pairs of signals present on the conductors and 81; 83 and 84; 85 and 86; 88 and 89 are combined by signal integrators corresponding to and identified by the same reference characters as the integrators 25 and 30 of FIGURE 1. Circuits appropriate for such integrators are shown in FIGURE 5, enclosed with dash lines and identified as the slub signal integrator 25 and the body yarn signal integrator 30.
  • the principal distinction between the two signal integrators is the presence, in the slub signal integrator 25, of a gating transistor 25a to the base of which the conductor 65 is operatively connected for application of the intermittent signal from the mechanical randomizer 29.
  • the gating transistor 25a in the slub signal integrator 25 controls the output from that integrator in such a manner that an output signal appears from the integrator only during such time that a signal is applied to the gating transistor through the conductor 65.
  • Each of the signal integrators is built up from a plurality of basic circuits which comprise an and gate formed by two transistors directly coupled by emitter to collector connection, such as the transistors 25b and 25c in the basic circuit to the far left of the integrator 25 in FIGURE 5, and an integrating circuit with signal pickoff through a potentiometer, such as the potentiometer 250! in the same basic circuit.
  • a potentiometer such as the potentiometer 250! in the same basic circuit.
  • the signal A carried by the conductor 80 is combined, by the basic circuit including the transistors 25b and 250 and the potentiometer 25d, with the signal B carried by the conductor 83.
  • Each of these signals is applied to the base of one of the two transistors 25b and 250, included in the and gate of the basic circuit, and, in the simultaneous presence of both signals, a signal is passed through an integrating transistor 25:: to be picked off through the potentiometer 25d, passed by a screening diode 25 and be presented as a component of an output signal from the slub signal integrator 25.
  • the two pairs of inversely varying signals carried by the conductors 85 and 86, and 88 and 89 are applied to the bases of transistors forming and gates in the four basic building block circuits including in the body yarn signal integrator 30 (lower half of FIGURE 5).
  • an uninterrupted or continuous body yarn signal appears on a conductor 91 as an output from the body yarn signal integrator 30.
  • the interrupted or discontinuous slub signal is superimposed on the continuous body yarn signal, and the two signals are thus simultaneously present on the conductor 91.
  • Slub and body yarn signal integrator In order to create the randomly varying drive signal for governing the speed of the rear set of drafting instrumentalities, the slub signal and body yarn signal generated as discussed above the combined and integrated together so that the magnitude of the drive signal thus created is determined by the greater instantaneous magnitude of the two signals thus applied.
  • a slub and body yarn signal integrator corresponding in function to that one included in the schematic diagram of FIGURE 1 is enclosed within a dash line in FIGURE 6 and identified by reference character 21.
  • This signal integrator includes a five-portion switch to permit selection of a signal from any of the four sets of signal generators and integrators described immediately above or a signal to be applied from a test circuit as indicated in block form in FIGURE 6.
  • the signal selected by positioning of the switch is applied to a signal amplifier and integrator using a single transistor 21a, to create a randomly varying drive signal which is applied to a conductor 92, operatively connected to a motor controller as described more fully hereinafter.
  • a motor controller as described more fully hereinafter.
  • nine additional slub and body yarn signal integrators are provided, three of which are shown by circuit diagrams in FIGURE 6 and six of which are incorporated within a single block diagram.
  • FIGURES 7, 7 and 8 Specific circuitry for performing this function is illustrated in FIGURES 7, 7 and 8 wherein the circuitry of a solid state motor controller and an interspeed braking controller, functionally corresponding to those schematically represented in FIGURE 1, are identified by the reference characters 19 and 34 and included, in part, within dash lines.
  • Operating current for the controller circuitry and the motor 15 is obtained through suitable connection to a source of line current such as 110 volts, with the line current being applied to the primary winding of a transformer T3 and to two terminals of a Wheatstone bridge circuit (FIGURE 8).
  • a source of line current such as 110 volts
  • a tachometer generator identified by reference character 18 is connected into the circuitry of the interspeed braking controller 34 through a bridge arrangements of diodes, in order to assure that a signal derived from the generator is applied to the circuitry with a proper polarity so that the circuits will function in the desired manner.
  • the line current applied to the Wheatstone bridge circuit 100 is rectified and supplied to the armature of the motor 15. Due to the inclusion in the bridge'100 of a pair of controller rectifiers 101 and 102, the effective voltage supplied from the bridge circuit 100 to the motor 15 may readily be controlled, as described more fully hereinafter. Upon an indication for a rapid increase in the speed of the motor 15, or an indication to maintain the motor speed constant at an attained rate, the voltage supplied from he bridge circuit quickly adjusts to the necessary level, and the characteristics of the motor assure a prompt response. However, due to the inertia of the motor itself and of the rotating parts driven thereby, the motor 15 does not so readily follow.
  • the drive signal 20 upon the signal calling for a rapid decrease in the voltage applied to the motor from the bridge circuit 100. Instead, the fly wheel effect of the motor and the parts driven thereby tends to cause the rate of which textile stands are supplied to the drafting zone to smoothly but slowly decrease.
  • the interspeed braking controller functions to impose a load on the armature of the motor 15 at any time that comparison of the signal originating from the tachometer generator 18 with the drive signal 20 indicates that the shaft speed of the motor 15 is above that required by the drive signal 20.
  • the Wheatstone bridge circuit 100 is shunted by a circuit including a plurality of load resistors 105, 106, 107, 108 and a controlled 9 rectifier 110.
  • the resistors 105-108 Upon firing of the controlled rectifier 110 to a conductive state (as discussed more fully hereinafter), the resistors 105-108 are electrically connected as a load across the armature of the motor 15, causing the motor to operate as a generator for sufiicient length of time to extract from the rotating elements of the spinning frame sufficient energy to reduce the momentum thereof to such a level that the shaft speed of the motor reaches the desired speed indicated by the drive signal 20.
  • each of the controllers includes an output transformer, respectively identified as transformers T4 and T5.
  • the purse of the circuitry included within the dash lines is to apply pulse trains of particular types to the primary windings of the transformers T4 and T5, depending upon a comparison between the drive signal present across the conductors 92 and '56 and the shaft speed signal generated by the tachometer generator .18.
  • a train of pulses is generated by a Schmidt trigger circuit connected with the primary of the transformer T4, to apply to the pair of controlled rectifiers 101 and 102 in the bridge 100 (FIGURE 8) a train of pulses which is determined by a summing of the incoming drive signal and the tachometer generator 18 signal at the base of a transistor 19a controlling two Schmidt trigger transistors 19b and 190.
  • the controlled rectifier 110 in the bridge shunting circuit is controlled by a train of pulses originated by a unijunction transistor 34a which is electrically connected to the primary of transformer T5, due to the connection of the controlled rectifier 110 to the secondary winding of the transformer T5.
  • a plurality of relay contacts are provided to control the connection of the armature of the motor 15 with the controllers 19 and 34.
  • the plurality of relay contacts 120, 121, 122 and 123 are controlled by a relay coil 124 which preferably is electrically connected with the starter of the main motor driving the spinning frame with which the DC motor 15 is used.
  • the motor .15 is disconnected from the control circuitry provided in accordance with the present invention, to assure that the motor ⁇ 15 is not driven during periods of time that the spinning frame is not in use.
  • the pairs of signals which are selected and combined are directed particularly toward an end result drive signal having randomly changing characteristics.
  • the apparatus and method of the present invention are adaptable to the formation of such yarn.
  • the potentiometers 26c and 26 and 27a and 27 which control the characteristics of the pairs of inverse signals A, A, B and B may be adjusted so that no slub signal is generated.
  • the pairing of the inverse signals D, D, E and E originating with the body yarn signal generators 31 and 32 may be selected in such a manner, by adjustment of the potentiometers corresponding to the potentiometer d and by interconnection of the conductors 85 and 86, 88 and 89 with the and gates in the body yarn signal integrator 30 (lower half of FIGURE 5), to obtain a continuous body yarn signal which alternates between predetermined signal magnitude levels with a predetermined pattern in relation to time.
  • the potentiometers used in the circuits described in more detail above are of the type that may be returned at will to particular settings.
  • a spinning frame having at least front and rear spaced apart sets of drafting instrumentalities for drafting fibrous textile strands passing therethrough, said front set normally being driven at a predetermined rotative speed and said rear set normally being driven at a slower relative speed than said front set for feeding the textile strand into the drafting zone at a slower rate than it is delivered, the improvement which comprises means connected to said rear set of drafting instrumentalities for driving the same at randomly varying rates to randomly vary the count of the strand being delivered from said drafting instrumentalities and comprising:
  • controllable variable speed drive means connected to said rear set of drafting instrumentalities independently of said front set for driving the rear set independently of said front set
  • control means operatively connected to said signal generating means (b) for receiving the first and second signals therefrom and combining the same to create a drive signal of randomly varying magnitude and operatively connected to said drive means (a) for varying the speed 'at which said rear set of drafting instrumentalities are driven in response to the magnitude of the drive signal.
  • said signal generating means comprises means for generating a plurality of signals each varying in a predetermined manner and an interrupted signal and gate means for receiving the varying and interrupted signals and for combining each of said varying signals with another signal varying in a different manner to generate at least two randomly varying signals and for controlling the passage of one of the randomly varying signals with the interrupted signal to generate an intermittently varying signal as the aforementioned second signal, the other of the at least two randomly varying signals being present as the aforementioned first signal.
  • said signal generating means includes a plurality of first signal sources each originating a pair of inversely varying signals and a first signal integrating means operatively connected to said first signal sources for integrating the plurality of pairs of signals originating from said first signal sources into a single continuous signal to thereby generate the aforementioned first signal.
  • said signal generating means includes a plurality of second signal sources, at least two of said second signal sources each originating a pair of inversely varying signals and another of said second signal sources originating an interrupted signal, and a second signal integrating means operatively connected to said second signal sources for integrating the plurality of pairs of signals originating from said at least two signal sources into a single signal and including a gate means actuated by the interrupted signal and controlling the passage of the single signal to thereby generate a discontinuous signal as the aforementioned second signal.
  • a spinning frame having at least front and rear spaced apart sets of drafting instrumentalities for drafting fibrous textile strands passing therethrough, said front set normally being driven at a predetermined rotative speed and said rear set normally being driven at a slower relative speed than said front set for feeding the textile strand into the drafting zone at a slower rate than it is delivered, the improvement which comprises means connected to said rear set of drafting instrumentalities for driving the same at randomly varying rates to randomly vary the count of the strand being delivered from said drafting instrumentalities and comprising:
  • controllable variable speed drive means connected to said rear set of drafting instrumentalities independently of said front set for driving the rear set independently of said front set.
  • said signal generating means includes a plurality of first signal source means each originating a voltage signal which varies in a predetermined manner as to duration, spacing and sequence of voltage peaks and a first signal integrating means operatively connected to said first signal source means for integrating the plurality of varying signals originating from said first signal source means into a single signal to thereby generate the aforementioned continuous first signal.
  • said signal generating means (b) includes a plurality of second signal source means, certain of said second signal source means each originating a voltage signal which varies in a predetermined manner as to duration, spacing and sequence of voltage peaks and another of said second signal source means originating an interrupted signal, and a second signal integrating means operatively connected to said second signal source means for integrating the signals originating from said certain signal source means into a single signal and including a gate means actuated by the interrupted signal and controlling the passage of the single signal to thereby generate the aforementioned discontinuous second signal.
  • a spinning frame having at least front and rear spaced apart sets of drafting instrumentalities for drafting fibrous textile strands passing therethrough, said front set normally being driven at a predetermined rotative speed and said rear set normally being driven at a slower relative speed than said front set for feeding the textile strand into the drafting zone at a slower rate than it is delivered, the improvement which comprises means connected to said rear set of drafting instrumentalities for driving the same at randomly varying rates to randomly vary the count of the strand being delivered from said drafting instrumentalities and comprising:
  • controllable variable speed drive means connected to said rear set of drafting instrumentalities independently of said front set for driving the rear set independently of said front set
  • (0) means operatively connected to said signal generating means (b) for receiving signals therefrom and for combining a signal of each pair of inverse signals with a signal of another pair to create at least two randomly varying voltage signals and for gating one of the randomly varying signals with the interrupted signal to create an intermittently varying voltage signal, and
  • control means operatively connected to said means (c) for receiving the randomly varying and intermittently varying voltage signals therefrom and combining the same to create a drive voltage signal of varying magnitude and operatively connected to said drive means (a) for varying the speed at which said rear set of drafting instrumentalities are driven in response to the magnitude of the drive signal.
  • said signal generating means (b) includes a plurality of multivibrator circuits, each of said circuits generating one of said pairs of inversely varying signals and comprising a pair of alternatively conducting circuit elements and means for controllably timing the alternation in conductive state of said circuit elements.
  • said signal generating means (b) includes a randomizer generating said interrupted signal and comprising a rotatively driven cam member and a plurality of electrically interconnected switches engaged thereby for completing an electrically conductive path at random time intervals.
  • said drive means (a) includes a voltage responsive electrical motor and said control means (c) modulates voltage applied to said motor and includes means responsive to the operating speed of the motor for imposing a load thereon in the event the operating speed thereof exceeds that indicated by said drive signal so as to facilitate fluctuation of such speed in response to variations in magnitude of the drive signal.
  • a spinning frame having at least front and rear spaced apart sets of drafting instrumentalities for drafting fibrous textile strands passing therethrough, said front set normally being driven at a predetermined rotative speed and said rear set normally being driven at a slower relative speed than said front set for feeding the textile strand into the drafting zone at a slower rate than it is delivered, the improvement which comprises means connected to said rear set of drafting instrumentalities for driving the same at preprogrammed varying rates to vary the count of the strand being delivered from the drafting instrumentalities in accordance with a predetermined pattern and comprising:
  • controllable variable speed drive means connected to said rear set of drafting instrumentalities independently of said front set for driving the rear set independently of said front set
  • control means operatively connected to said means (c) for receiving the intermittently varying voltage signal therefrom and for creating a drive signal of varying magnitude and operatively connected to the drive means (a) for varying the speed at which the rear set of drafting instrumentalities are driven in response to the magnitude of the drive signal.
  • a method according to claim 13 wherein the step of generating signals includes modulating electrical currents to generate volt-age signals as the aforementioned first and second signals.
  • a method according to claim 14 wherein the step of generating signals includes generating a plurality of pairs of inversely varying signals and integrating together a signal of each pair of inversely varying signals with a signal of another pair of such signals.
  • step of generating first and second signals includes generating a continuous voltage signal as the aforementioned first signal and generating a discontinuous voltage signal as the aforementioned second signal.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US709543A 1968-03-01 1968-03-01 Variable count and slubbing apparatus and method Expired - Lifetime US3449899A (en)

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CH (1) CH490530A (de)
DE (1) DE1910034A1 (de)
ES (1) ES381040A1 (de)
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Cited By (9)

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Publication number Priority date Publication date Assignee Title
US4073125A (en) * 1976-02-13 1978-02-14 Giuseppe Bolli Drive mechanisms of spinning or twisting machines adapted for the formation of knop yarn
US4100399A (en) * 1975-09-04 1978-07-11 Saurer-Allma Gmbh Programmed control for effect spinning and twisting machines
US4160359A (en) * 1978-04-24 1979-07-10 Milliken Research Corporation Random signal generator for the manufacture of slub open end spun yarn
FR2441671A1 (fr) * 1978-11-15 1980-06-13 Evolution Sa Variateur de vitesses pour metiers a filer ou a retordre
US4218868A (en) * 1978-08-24 1980-08-26 Milliken Research Corporation Slubbed open end spun yarn
JPS6081326A (ja) * 1983-10-07 1985-05-09 Howa Mach Ltd 特殊糸の製造方法および装置
JPS60139831A (ja) * 1983-12-26 1985-07-24 Howa Mach Ltd 特殊糸の製造方法および装置
US4569192A (en) * 1983-12-02 1986-02-11 Howa Kogyo Kabushiki Kaisha Apparatus for producing special yarns
CN100443643C (zh) * 2004-11-30 2008-12-17 株式会社丰田自动织机 特殊纱线制造装置

Families Citing this family (2)

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US4250701A (en) * 1978-08-31 1981-02-17 Techniservice Division, Textured Yarn Co., Inc. Apparatus and method for making loop chenille type yarn
DE102017101597B4 (de) 2017-01-27 2019-09-26 Terrot Gmbh Verfahren zum Herstellen einer Maschenware

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US2612743A (en) * 1948-01-22 1952-10-07 Deering Milliken Res Trust Method and means for control of independently variable characteristics
US2622282A (en) * 1948-01-12 1952-12-23 Deering Milliken Res Trust Method and means for producing and utilizing control signals
US2810165A (en) * 1955-05-11 1957-10-22 West Point Mfg Co Slub mechanism and signal generator therefor
US2811011A (en) * 1953-05-13 1957-10-29 Deering Milliken Res Corp Apparatus for producing novelty yarn
US2878636A (en) * 1955-08-11 1959-03-24 Deering Milliken Res Corp Control system and method
US2929114A (en) * 1958-12-11 1960-03-22 Burlington Industries Inc Slubbing attachment for spinning frame
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US2622282A (en) * 1948-01-12 1952-12-23 Deering Milliken Res Trust Method and means for producing and utilizing control signals
US2612743A (en) * 1948-01-22 1952-10-07 Deering Milliken Res Trust Method and means for control of independently variable characteristics
US2595220A (en) * 1949-03-30 1952-05-06 Deering Milliken Res Trust Production and utilization of control signals
US2811011A (en) * 1953-05-13 1957-10-29 Deering Milliken Res Corp Apparatus for producing novelty yarn
US2810165A (en) * 1955-05-11 1957-10-22 West Point Mfg Co Slub mechanism and signal generator therefor
US2878636A (en) * 1955-08-11 1959-03-24 Deering Milliken Res Corp Control system and method
US2962771A (en) * 1958-03-03 1960-12-06 Chemstrand Corp Control system for textile apparatus
US2929114A (en) * 1958-12-11 1960-03-22 Burlington Industries Inc Slubbing attachment for spinning frame

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US4100399A (en) * 1975-09-04 1978-07-11 Saurer-Allma Gmbh Programmed control for effect spinning and twisting machines
US4073125A (en) * 1976-02-13 1978-02-14 Giuseppe Bolli Drive mechanisms of spinning or twisting machines adapted for the formation of knop yarn
US4160359A (en) * 1978-04-24 1979-07-10 Milliken Research Corporation Random signal generator for the manufacture of slub open end spun yarn
US4218868A (en) * 1978-08-24 1980-08-26 Milliken Research Corporation Slubbed open end spun yarn
FR2441671A1 (fr) * 1978-11-15 1980-06-13 Evolution Sa Variateur de vitesses pour metiers a filer ou a retordre
US4276739A (en) * 1978-11-15 1981-07-07 Evolution Sa Electronically controlled system for making a multiply effect yarn
JPS6081326A (ja) * 1983-10-07 1985-05-09 Howa Mach Ltd 特殊糸の製造方法および装置
US4569192A (en) * 1983-12-02 1986-02-11 Howa Kogyo Kabushiki Kaisha Apparatus for producing special yarns
JPS60139831A (ja) * 1983-12-26 1985-07-24 Howa Mach Ltd 特殊糸の製造方法および装置
CN100443643C (zh) * 2004-11-30 2008-12-17 株式会社丰田自动织机 特殊纱线制造装置

Also Published As

Publication number Publication date
GB1246583A (en) 1971-09-15
FR2003063A1 (de) 1969-11-07
DE1910034A1 (de) 1969-10-02
ES381040A1 (es) 1973-06-16
CH490530A (de) 1970-05-15

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