Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1993-02-02
1995-01-03
Gilreath, Stanley N.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
B65H 5120
Patent
active
053779223
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device on a sensing and/or analyzing system for a yarn feeder with yarn storing unit (spool body) in which the system is designed to initiate information attributable to one or more of the functions: detection of the presence or absence of yarn turns on the unit, detection of the maximum or minimum number of yarn turns on the unit, analysis or sensing of the yarn, for example of its diameter, colour, etc., and/or analysis or sensing of the yarn store's behaviour/changes during operation, etc. The system is therefore of the type which comprises one or more sensor elements and, where necessary, one or more members, preferably electrical circuits, for processing, evaluating and/or initiating, etc. information from the said sensor elements. Also included are power supply members for each sensor element and member (circuit).
BACKGROUND OF THE INVENTION
Analyzing and sensing systems for yarn feeders are known in the art. Also known is the use of radiation emitting and radiation receiving members for establishing the presence of yarn on the spool body in a yarn feeder. In these, use is made of evaluating circuits for determining the presence of yarn stores located on the spool body and regulating the number of turns of the yarn feeder as a function of the evaluation. Reference may be made here, inter alia, to European Published Patent Application EP 192 851 and German Published Specification 2 609 973.
A general demand exists with yarn feeders to effect a reliable sensing and analyzing function. Among other things, the problem depends on whether or not the yarn store supporting unit or body is subject to vibration. With a body subject to vibration the aim here is to ensure that the unit is arranged in the yarn feeder in such a way that when the yarn feeder is in operation, the unit can vibrate or oscillate owing to mechanical phenomena and oscillations. The function of the sensing and analysing system must also take account of tolerances which exist in the component parts of the yarn feeder and its assembly, and there are problems in making the sensing and analyzing systems independent of any variation parts of the yarn feeder. In some designs there is a demand for using relatively large tolerances between the assembly positions of the various parts of the yarn feeder. Another demand is for the facility for assembling the parts included in the sensing and analyzing system in a modular arrangement. This gives rise to problems in establishing radiation paths inside the modular arrangement which give small overall heights.
If an imaging system, for example, is used for sensing and/or analysis, there is a limited area in which a sufficiently sharp image required for the initiation is obtained. In the case where a radiation source outside the unit/body is used for emitting the beam from outside against the yarn, there are the problems of effective indication in connection with the yarn feeder.
Demands may arise with the sensing and analysing function for the use of a contact image function, imaging function with object lens or shadow image sensing. Various possibilities exist with regard to this and examples include the use of refracting optics in the unit/body, mirror optics in the unit/body, optics outside the unit/body or a function in which the yarn is used as the dispersing/reflecting element in the identification function.
If refracting optics are used, for example, in the unit, there is a decided problem in getting away from the effect of oscillations in the unit. The same goes for mirror optics in the unit/spool body. With optics outside the spool body there are problems with obtaining a sufficiently good focus from the optics without making the mechanical tolerances too stringent.
The yarn feeder must be capable of working with various types of yarn and yarn diameters. When detecting fine yarns it should be possible to use imaging optics in order to obtain small measuring points, for example measuring points in the order of 30-100.times.10.sup.-5 m
REFERENCES:
patent: 3720384 (1973-03-01), Rosen
patent: 4161297 (1979-07-01), Vella
patent: 4180215 (1979-12-01), Nurk
patent: 4653701 (1987-03-01), Riva
patent: 4676442 (1987-06-01), Tholander et al.
patent: 4687149 (1987-08-01), Riva
patent: 4715411 (1987-12-01), Van Bogaert et al.
patent: 4865085 (1989-09-01), Ghiardo
patent: 5119998 (1992-06-01), Tholander et al.
Fredriksson Lars-Berno
Fritzson Joachim
Gilreath Stanley N.
Iro AB
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