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
  • D01H13/22—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to presence of irregularities in running material

Definitions

• the present invention relates to a method for monitoring or measuring the uniformity of spun fiber cables by mechanical probes in the course of cable production on the belt line.
• Devices that serve this purpose are known for example from DE-AS-21 44 104, DE-OS-24 00 293 or German Patent No. 11 208.
• the devices known from DE-AS-21 44 104 and DE-OS-24 00 293 work with tracer rollers which scan the thickness of the fiber cable.
• a so-called feeler saddle is used for this purpose, which is to be thrown up by thick points of the cable.
• the present invention provides a method with which the quality of a synthetic fiber cable can be monitored and, if necessary, evaluated.
• An object of the present invention is therefore a method for monitoring or measuring the uniformity of synthetic fiber cables by means of mechanical probes, during production on the belt line, in which the mechanical tension of the running cable is measured in front of a roller arrangement transporting the cable at a defined speed and as a measure for the uniformity of the fiber cable serves.
• Roller arrangements that can give a cable a defined speed therefore contain two or more - common are e.g. up to seven rollers (so-called septets) - rollers which are either arranged so that they pass the cable one after the other with the greatest possible wrap angle or they are designed as pairs of squeeze rollers.
• septets rollers
• the transport roller arrangement consists of a pair of squeeze rollers
• a thickening of the fiber cable as it passes through the nip leads to an increase in tension
• a thin point of the cable leads to a decrease in tension if the cable is also under tension downstream of the pair of squeeze rollers.
• the cable is no longer under tension downstream of the squeeze roller, e.g. behind the feed rollers of a stuffer box (crimping chamber)
• the effects are reversed: a cable thickening leads to a voltage drop, a thin point provokes a voltage increase.
• Cable tension measurement can be continuous, i.e. be carried out without interruption, whereby a voltage signal is obtained which can be used for constant control of the cable quality.
• the measurement can also be carried out intermittently at short intervals. This embodiment is advantageous when e.g. a single evaluation and control device is provided for several measuring points. The evaluation computer then works as it were in the time sharing process.
• the evaluation of the signal sequence for determining the cable quality is expediently carried out by a computer which can output the results in real time and thus enables process control if desired.
• All known measuring devices for mechanical tension of spun fiber cables are suitable for carrying out the method according to the invention.
• Devices that work with a dancer roller i.e. a movable roller arranged under pressure on the cable and arranged between two fixed rollers.
• the dancer roller can be controlled in different ways, for example it is possible to have the dancer roller form a relatively long loop of the cable so that the cable loops around the dancer roller at approximately 180 °.
• the dancer roller is held in this position by spring force, so that every change in tension of the cable leads to a change in position of the dancer roller.
• the change in position of the dancer roller is then converted in a manner known per se into an electrical analog or digital signal and further processed in the manner described above.
• a dancer roller can also be operated, for example, in such a way that it is held in a position by a constantly measured force in which it deflects the running synthetic fiber cable only relatively slightly, for example by an angle between 20 and 45 °.
• the force required in each case to maintain this position is continuously measured and converted in a manner known per se, for example by an electronic tensiometer, into an electrical signal which is evaluated as described above.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
• Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
• Treatment Of Fiber Materials (AREA)
• Preliminary Treatment Of Fibers (AREA)
• Spinning Or Twisting Of Yarns (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=6408638

Family Applications (1)

Country Status (6)

Families Citing this family (4)

Citations (2)

Family Cites Families (11)

• 1990
  • 1990-06-19 DE DE4019469A patent/DE4019469A1/de not_active Withdrawn
• 1991
  • 1991-06-12 EP EP91109636A patent/EP0464417B1/fr not_active Expired - Lifetime
  • 1991-06-12 DE DE59108643T patent/DE59108643D1/de not_active Expired - Fee Related
  • 1991-06-18 IE IE208991A patent/IE912089A1/en unknown
  • 1991-06-18 PT PT98024A patent/PT98024B/pt not_active IP Right Cessation
  • 1991-06-19 JP JP3147445A patent/JPH04250333A/ja active Pending
• 1994
  • 1994-04-29 US US08/235,185 patent/US5490308A/en not_active Expired - Fee Related

Patent Citations (2)

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