Classifications

• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
  • D01G23/00—Feeding fibres to machines; Conveying fibres between machines
  • D01G23/06—Arrangements in which a machine or apparatus is regulated in response to changes in the volume or weight of fibres fed, e.g. piano motions

Definitions

• the present invention concerns an apparatus for establishing measuring values corresponding to the material cross-section area of fiber slivers processed in spinning preparation, with a pneumatic throughput measuring duct tapering off as seen in the direction of move ent of the fiber sliver.
• the throughput measuring duct between consecutively arranged planes extending at right angles with respect to the duct axis contains a hollow room, to which a anometer is connected.
• the pressure measured by the manometer forms a measuring value corresponding to the material cross-section area of the fiber sliver transported through the duct.
• the device described shows the serious disadvantage that the measuring value does not solely depend on the material cross-section area of the fiber sliver, but also depends on the fiber sliver throughput speed, the fiber shape and the fiber fineness and thus yields a biased measure of the material cross-section area of the fiber sliver.
• an apparatus for establishing measuring values corresponding to the material cross-section area of fiber slivers processed in spinning preparation with a pneumatic throughput measuring duct converging as seen in the direction of movement of the fiber sliver, characterized in that two pneumatic pressure measuring ducts are connected on one hand to two measuring points at which the duct is of different cross-section area and are connected on the other hand to a division circuit arrangement.
• Fig. 1 an apparatus provided with a step-funnel as a throu put measuring duct, and in
• FIG. 2 for suitable funnel shapes of the throughput and 3 measuring duct applicable in the apparatus accordin to Fig. 1.
• a fiber sliver 1 for measuring is transported through a funnel which in principle consists of two combined step-funnels, one of the funnels being of the lengths 1 .., 1 and of the cross-section areas A, A_ and the other funnel being of the length 1, 1 and of the cross-section areas A_, A-, the and the cross-section area A_ thus being com on to both
• two measuring points 3 and 4 for measuring the pressure are provided, each being connected via the pneumatic ducts 5 and 6 respectively, with pneumatic-electric transducers 7 and 8 by which the pressure measured by a pressure measuring instru- ment is transformed into a proportional voltage.
• the transducers 7 and 8 via electrical circuits 9 and 10 are connected with an electronic division circuit device 11 which yields an output signal 12.
• the pneumatic pressure p scanned at the measuring points 3 and 4 is transformed by the transducers 7 and 8 into proportio- nal voltage U. Both voltages subsequently are transmitted to the division circuit device 11 where their quotient is formed.
• the Output signal 12 is a voltage U (t) depending on the current titer (or linear density) of the fiber sliver, which is proportional to the quotient of the two pressures p and thus forms a measuring value of the material cross- section area of the fiber sliver 1.
• This measuring value now is not influenced by the throughput speed of the fiber sliver nor by the fiber shape, nor by the fiber fineness, and thus is suitable for Controlling purposes, or easily can be trans-formed by suitable transformation into a measure normally used for the material cross-section of the fiber sliver.
• inventive apparatus is not limited to the step-funnel according to Fig. 1, as the eli ination of the biasing influences owing to the quotient formation does not depend on the funnel shape.
• a converging funnel of any desired shape can be used, into which the two measuring ducts 5 and 6 merge at points of differing duct cross-section area.
• Advantageous funnel shapes do not contain, if possible, abrup changes in cross-section area, in such manner that the positi of the fibers in the fiber array remains as undisturbed as possible. It also is possible to provide the throughput measu ring duct in two separate funnels arranged consecutivel, eac 100 funnel being provided with a measuring point.
• funnels 2 of 105 suitable cross-section shape are shown, one of the funnels comprising a conical fiber • throughput duct section between two cylindrical sections, and the other funnel comprising a curved convergence of the fiber throughput duct.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Spinning Or Twisting Of Yarns (AREA)
• Preliminary Treatment Of Fibers (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=4412618

Family Applications (1)

Country Status (11)

Cited By (2)

Families Citing this family (3)

Citations (2)

Family Cites Families (1)

• 1977
  • 1977-12-22 CH CH1586577A patent/CH624759A5/de not_active IP Right Cessation
• 1978
  • 1978-10-14 WO PCT/EP1978/000018 patent/WO1979000419A1/de not_active Ceased
  • 1978-10-14 JP JP50005778A patent/JPS55500020A/ja active Pending
  • 1978-10-14 DE DE2857279T patent/DE2857279C2/de not_active Expired
  • 1978-10-18 AT AT0748478A patent/AT379241B/de not_active IP Right Cessation
  • 1978-10-24 IT IT29047/78A patent/IT1099431B/it active
  • 1978-10-31 NL NL7810847A patent/NL7810847A/xx not_active Application Discontinuation
  • 1978-12-13 AR AR274792A patent/AR216966A1/es active
  • 1978-12-15 ES ES476694A patent/ES476694A1/es not_active Expired
  • 1978-12-22 BE BE192546A patent/BE873049A/xx not_active IP Right Cessation
• 1979
  • 1979-07-16 EP EP78900223A patent/EP0007373B1/en not_active Expired

Patent Citations (2)

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