Textiles: spinning – twisting – and twining – Apparatus and processes – Stopping or starting
Patent
1981-08-20
1983-07-19
Petrakes, John
Textiles: spinning, twisting, and twining
Apparatus and processes
Stopping or starting
200 6118, 242157C, D01H 1316
Patent
active
043936474
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an improved snail wire arrangement with a higher sensitivity which is utilized for a yarn breakage detector for detecting yarn breakage during spinning in a ring spinning frame.
BACKGROUND ART
Commonly, snail wires provided on a ring frame produce inherent or unique vibrations when they are brought into contact with the spinning yarns i.e. yarns being spun. For detecting the yarn breakage in the ring frame through detection of such vibrations as described above, there has conventionally been proposed a yarn breakage detector in which piezo-electric elements are attached to the snail wires for deriving necessary signals therefrom.
On the other hand, in ring frames or similar spinning machines, early detection of yarn breakage is of vital importance to increase the production, minimize faulty yarns, and prevent various problems in advance.
For the above purpose, there have been already known various yarn breakage detecting means, which may be classified into such types as utilizing variations due to yarn breakage by contacting a feeler with the spinning yarns, employing a photoelectric tube, or based on dielectric constant, etc. Meanwhile, the detecting means as described above are broadly divided into one kind in which the yarn breakage portions are detected while detectors are being moved along a large number of spinning yarn lines, and the other kind in which counterparts of the detectors are provided on individual spinning parts.
However, the former or moving type requires a device for moving and guiding the detectors, and, in particular, a considerable investment for applying the detectors to the existing frames. Therefore, the latter type in which the counterparts are disposed on the individual spinning parts is preferable. Furthermore, the above described photoelectric tube type or dielectric constant type is not only expensive, but is not suitable for practical applications, since improper decisions may result from accumulation of flies, etc. Moreover, it is almost impractical to dispose the detectors on the individual spinning parts from an economic point of view. Accordingly, there is a requirement for the detecting means which may be disposed on the individual spinning parts, and yet, readily applicable to the existing frames.
On the other hand, snail wires are disposed on such ring frames for guiding spinning yarns onto take-up bobbins, and produce vibrations when coming into contact with the spinning yarns, and therefore, there has also been proposed means for detecting the yarn breakage through detection of such vibrations by a piezo-electric element. Furthermore, since the above vibrations include those due to contact with the spinning yarns, and those arising from mechanical vibrations of the ring frame, there is also known another arrangement which discriminates these vibrations for detection.
For example, in the yarn breakage detecting device of U.S. Pat. No. 4,254,613 filed May 16, 1979, as shown in FIGS. 1 to 7, the spinning yarn Y is drawn out from between front rollers 1, 1', and is wound onto a bobbin 8 while being guided by a snail wire 2. Meanwhile, the spinning yarn Y is wound onto the bobbin 8 through a ring 5 supported by a ring rail 4 for simultaneous vertical movements therewith and a traveller 6 movably mounted on the ring 5, so as to form a cop 7, with an antinode ring 9 being further provided as shown. Each snail wire 2 is mounted on a lappet 3, which is, in turn, disposed on a lappet bar 10. The snail wire 2 is attached to the lappet 3 so that the position of its yarn guide portion may be changed, while the lappet bar 10 is so provided as to be vertically movable by a slight distance along a support spindle of the bobbin 8. For the detection of yarn breakage, a piezo-electric element 12 is fixed to a portion of the snail wire 2 for deriving electrical power produced in the piezo-electric element for effecting the individual detection. Meanwhile, by contact with the spinning yarn Y, the snail wire is subjected to vibrations
REFERENCES:
patent: 3132466 (1964-05-01), Preisser
patent: 3688958 (1972-09-01), Rydborn
patent: 3968637 (1976-07-01), van Andel et al.
patent: 4254613 (1981-03-01), Arita et al.
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