Apparatus for monitoring yarn at winders

Claim 3

The apparatus as defined in claim 1, wherein said interrogation mechanism comprises a mechanical element positively acting upon the yarn.

Claim 4

The apparatus as defined in claim 1, wherein said interrogation mechanism comprises electromagnetic means actuated by an electrical trigger signal, said electromagnetic means incorporating a movable armature capable of positively acting upon the yarn.

Claim 5

The apparatus as defined in claim 1, wherein said interrogation mechanism serves to deflect the yarn out of a given position.

Claim 6

The apparatus as defined in claim 1, wherein said winder incorporates a driven wind-up bobbin, said interrogation mechanism serves to subject the yarn to a lengthwise movement by briefly activating the driven wind-up bobbin.

Claim 7

The apparatus as defined in claim 1, wherein said winder incorporates a driven wind-up bobbin, said means serving to actuate said interrogation mechanism comprises an electronic circuit with which said transducer means cooperates, said electronic circuit delivering a continuous yarn travel signal when the yarn is moving, said yarn travel signal possessing a trailing edge when the yarn is broken or has run out serving to stop the wind-up bobbin and serving as trigger signal for the interrogation mechanism.

Claim 8

The apparatus as defined in claim 6, wherein said electronic circuit embodies an amplifier circuit followed by a rectifier circuit and a pulse shaper circuit so that there is produced a direct-current voltage signal serving as the yarn travel signal and having a well-defined trailing edge.

Claim 9

The apparatus as defined in claim 6, further including an actuation mechanism for initiating a knotting operation or bobbin change operation, an evaluation circuit operatively connected with said electronic circuit, said evaluation circuit upon the occurrence of a response signal, following a trigger signal delivered by the electronic circuit, delivers at least one control signal for actuating said actuation mechanism for the knotting operation or bobbin change operation.

Claim 10

The apparatus as defined in claim 8, wherein said evaluation circuit comprises an AND-gate having a pair of inputs, one of said inputs directly being connected with the output of said electronic circuit and the other input being connected through the agency of a monostable multivibrator with the output of said electroNic circuit.

Claim 11

The apparatus as defined in claim 8, further including a delivery cop and a winding unit where the yarn delivered from said delivery cop through a given path of travel is wound as a yarn package, a yarn brake disposed intermediate said delivery cop and said winding unit in the path of travel of the yarn between said delivery cop and said winding unit, a first actuation mechanism in circuit with said evaluation circuit for carrying out a knotting operation and a second actuation mechanism in circuit with said evaluation circuit for carrying out exchange of the delivery cop, said transducer means and said interrogation mechanism being effective at the region of the lower portion of the yarn prior to entry into said yarn brake, and upon occurrence of a response signal said first actuation mechanism for the knotting operation is triggered and upon absence of the response signal following a yarn travel-terminal signal there is actuated the second actuation mechanism for the exchange of the delivery cop.

Claim 12

The apparatus as defined in claim 8, further including a delivery cop and a winding unit, said delivery cop serving to supply yarn along a predetermined path of travel to the winding unit to wind the yarn thereat in the form of a full-wound bobbin, a yarn brake disposed intermediate said delivery cop and said winding unit at said predetermined path of travel, a first actuation mechanism for exchanging the wound bobbin, a second actuation mechanism for initiating a knotting operation, said transducer means and said interrogation mechanism being effective at the region of the upper portion of the yarn after passing said yarn brake, and upon occurrence of a response signal after stopping the full-wound bobbin said first actuation mechanism for carrying out exchange of the full wound bobbin is triggered, and upon the absence of a response signal after placing the wound bobbin into a standstill condition said second actuation mechanism is triggered for carrying out a knotting operation.