Yarn feeder device utilizing position sensors to maintain yarn wrap
AssigneeSIPRA Patententwicklungs-u.Beteiligungsgesellschaft mbH
InventorFritz Conzelmann
Life of this patent
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Abstract
In a yarn feeder (2), the yarn feed may be effected by a yarn reserve (11) support spool (2), which is arranged to rotate by means of a motor (60). The yarn is taken up by and unwound from the spool as the latter rotates. Unwinding of the yarn reserve on the spool is not controlled. The size of the yarn reserve is monitored and yarn take-up is controlled accordingly. The unit also includes electrically contactless sensing and control devices (3), which are preferably located immediately adjacent to the rotary spool. The unit (3) is designed to sense the presence and quantity of yarn on the yarn reserve support surface (10) of the spool. The unit also controls the said motor.
Claims28
A yarn feeder device for textile machines, comprising a rotary storage member having a yarn reserve supporting surface provided with a varying background of reflective and non-reflective surfaces;
- a motor for rotating said storage member;
- and sensing and control means taking into account said varying background and recognizing a presence or absence of yarn at least partially against the non-reflective surface of said yarn reserve supporting surface so as to control said motor such that a selected quantity of yarn can be maintained on said yarn reserve supporting surface.
Dependencies are inferred from the claim text.