Classifications

• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01H—SPINNING OR TWISTING
  • D01H13/00—Other common constructional features, details or accessories
  • D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
  • D01H13/16—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material
  • D01H13/1616—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material characterised by the detector
  • D01H13/1633—Electronic actuators
  • D01H13/165—Photo-electric sensing means
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01H—SPINNING OR TWISTING
  • D01H13/00—Other common constructional features, details or accessories
  • D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
  • D01H13/145—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements set on carriages travelling along the machines; Warning or safety devices pulled along the working unit by a band or the like

Definitions

• a plurality of pulse electrical signals are generated in response to variation in illumination in spaced and positionally related sensor fields of view.
• the plurality of pulse electrical signals are supplied to a logic circuit responsive to normal traversal of the traveling detector for distinguis ing between signalling from all sensors within a pre ⁇ determined time period and indicative of the presence of a yarn and signalling from less than all of the sensors and indicative of a fluctuation in ambient lighting or apparatus reflections.
• a logic circuit includes a plurality of gate devices inter ⁇ connected one with another and with a plurality of sensor The gate devices function together as described more fully hereinafter, in such a way as to distinguish sensor signals of particular frequencies and amplitudes and to generate a signal indicative of the presence of a yarn upon the occurrence of coincidence or overlapping sensor signals having the appropriate frequencies and amplitudes.
• Figure 1 is an end elevation view, partially in section, of a traveling pneumatic cleaner and spinning frame incorporating ends down detecting apparatus in accordance with the present invention
• Figure 2 is a perspective view, from one side and above, of certain portions of the structure illustrated in Figure 1, showing an application of the present invention
• Figure 3 is an enlarged, sectional view through portion of the structure of Figure 1; and Figure 4 is a schematic circuit diagram of an electrical circuit means for the apparatus illustrated in Figures 1 - 3.
• apparatus which travels detector means along textile strand processing machines such as spinning frames for detecting ends down conditions.
• the present invention is particularly concerned with apparatus in which the travel of a detector means results from the combination of electrical circuit means with a traveling pneumatic cleaner generally indicated at 10 mounted on a track generally indicated at 11 for movement above and along a plurality of spindles on at least one textile strand processing machine such as a spinning frame generally indicated at 12.
• a traveling pneumatic cleaner generally indicated at 10 mounted on a track generally indicated at 11 for movement above and along a plurality of spindles on at least one textile strand processing machine such as a spinning frame generally indicated at 12.
• 0MP1 l ⁇ - WlPO .V. frame 12 has locations spaced therealong, at the spindles 14, at which ends of yarn pass from front ⁇ delivery rolls of drafting systems generally indicated at 15 through stationary guides 16, to rotating guides such as travelers moving about spinning rings, and onto a package or bobbin being formed.
• a portion of the path of movement followed by an end . of yarn presents the yarn moving generally along a line while another portion presents the yarn moving in a rotating balloon.
• the rate of rotation of the balloon of yarn imparts a vibrating motion or characteristic to the yarn in that portion of the path where the yarn is moving generally along a line.
• a determination of the absence of ends of yarn from a textile strand processing machine such as the spinning frame is accomplished generally in accordance with operations as described in the aforementioned related United States patents, in that pulse electrical signals are generated in response to the presence of e ' nds of yarn and are then processed through certain electrical circuits to report and/or register an ends down condition as required for a particular environment and installation
• pulse electrical signals are generated in response to the presence of e ' nds of yarn and are then processed through certain electrical circuits to report and/or register an ends down condition as required for a particular environment and installation
• light may be directed against yarns from an appropriate lamp generally indicated at 20 traveling with the traveling apparatus 10 and mounted within a protective housing " 21.
• Light emitted from the lamp 20 or the like is directed through an optical system into a field of illumination indicated by phantom lines 22 and toward yarns inter ⁇ mediate the delivery rolls of the drafting systems 15 and the pigtail guides 16.
• Optical system means generally ' indicated at 24 defines a light path, for focusing light reflected from the yarns. While shown as a single, simple lens, the optical system means 24 will take such -forms as are appropriate to the operation of the present invention as described more fully hereinafter.
• a plurality of photosensitive means mounted within the protective housing 21 in predetermined relation with the optical system means 24 are a plurality of photosensitive means, illustrated as two phototransistors 25A, 25B.
• the photosensitive means 25A, 25B receive light passed along a common light path by the optical system means 24. That is, each of the plurality of photosensitive means 25A, 25B views yarns through the common, single optical system means 24.
• the plurality of photosensitive means 25A, 25B are mounted for viewing separate, respective, vertically spaced and aligned, fields of view.
• one of the photo- sensitive means (for example the upper phototransistor 25A) generates pulse electrical signals in response to variations in illumination in a lower portion of that field of view 26, while the other generates pulse electrical signals in response to variations in illumina- tion in a vertically (upwardly, in this example) spaced and aligned portion thereof.
• traversal of the traveling unit 10 and the housing 21 adjacent a series of spindles 14 will traverse the field of view 26 of the optical system means 24 and the spaced portions thereof across a series of yarns.
• logic circuit means are electrically connected to the photo ⁇ sensitive means for receiving pulse signals therefrom and are responsive to normal traversal of the photosensitive means fields of view for distinguishing between (a) signalling from all of the photosensitive means within a predetermined time period and indicative of the presence of a yarn and (b) signalling from less than all of the sensor, means and indicative of a fluctuation in ambient lighting or an apparatus reflection.
• FIG. 4 Such a circuit arrangement is illustrated in Figure 4, where a pair of phototransistors 25A, 25B correspond to those shown in Figure 3.
• phototransistor 25A an output therefrom is connected with an inverting differentiator amplifier 28 ⁇ .
• the amplifier 28A operates as a differentiator responding to a rate of change, the amplifier 28A has mor, gain in respond ing to a yarn signal than in responding to slowly varying background illumination. Thus, slow variations in back- ground illumination are suppressed.
• provisi is made for an adjustable bias' to be applied through a potentiometer 29, such that a signal threshold or necessary amplitude is established.
• An output from the differentiator amplifier 28A is coupled to a voltage comparator amplifier 30A which functions to apply a positive pulse to a one-shot multivibrator 31A in the event of an apparent yarn response signal from the phototransistor 25A.
• the one-shot multivibrator 31A is set to one of two conductive states by . the pulse and, after a predetermined- interval of time (for example 12 milliseconds) , returns to its alternate state.
• a similar signal channel including a differentiator amplifier 28B, voltage comparator amplifier 30B and multivibrator 31B is operativel - connected with the second phototransistor 25B for similarly responding to an apparent yarn- signal.therefrom.
• the coincidence multivibrator 32 remains in its set condition 0 for a predetermined interval of time (for example on the order of 40 milliseconds) and then returns to its other state.
• An output signal from the coincidence multivibrator 32 is passed through an output multivibrator 34 and a line driver device 35 to supply a yarn present signal to 5 other and further cadence circuitry such as is described, for example, in aforeme tioned United States Patent 3,659,409.
• other and further circuitry may take a variety of different forms and forms no major part of the present invention, such circuitry will not here 0 be described at length and interested readers are instead referred to the aforementioned United States patent and other descriptions available to persons skilled in the applicable arts.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Spinning Or Twisting Of Yarns (AREA)
• Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
• Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
• Looms (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=25201315

Family Applications (1)

Country Status (10)

Cited By (2)

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Citations (3)

Family Cites Families (6)

• 1977
  • 1977-06-23 US US05/809,428 patent/US4112665A/en not_active Expired - Lifetime
• 1978
  • 1978-06-22 GB GB8029767A patent/GB2080942B/en not_active Expired
  • 1978-06-22 CH CH6732/80A patent/CH647563A5/de not_active IP Right Cessation
  • 1978-06-22 JP JP7591078A patent/JPS5411319A/ja active Granted
  • 1978-06-22 DE DE2857592A patent/DE2857592C2/de not_active Expired
  • 1978-06-22 WO PCT/US1978/000018 patent/WO1979000010A1/en unknown
  • 1978-06-23 ES ES471387A patent/ES471387A1/es not_active Expired
  • 1978-06-23 IT IT50014/78A patent/IT1105265B/it active
• 1979
  • 1979-01-16 EP EP78900022A patent/EP0006859A1/de not_active Withdrawn
• 1980
  • 1980-08-21 FR FR8018330A patent/FR2478141A1/fr active Granted

Patent Citations (3)

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