Cutting device of a textile yarn during its feeding to an operating device

Abstract

A device for cutting a textile yarn during its feed to an operator element such as a textile machine for its processing or a member for feeding it to such a machine. The device includes a blade member inserted into a housing presenting at least one aperture for passage of the yarn, the blade member carried by a movable support element subjected to an actuator for its movement. The movable support element being able to assume two working positions, a first position in which the blade member is spaced from the yarn and a second position in which the member cooperates with the yarn and cuts it. The actuator include a bistable electromagnet, a spring mounted about the movable support member urging the blade member into the cutting position.

1 . A device for cutting a textile yarn during its feed to an operator element, said device comprising:
 a cutting blade member inserted into a housing presenting at least one aperture for passage of said yarn,   said blade member carried by a movable support element subjected to actuator means for movement of the movable support element,   said movable support element for assuming two working positions, a first position in which the blade member is spaced from the year and a second position in which said blade member impacts the yarn and cuts the yarn,   the actuator means comprising a bistable electromagnetic actuator,   the movable support element cooperating with a spring arranged to urge the blade member into the yarn cutting position after activation of the bistable electromagnetic actuator,   said spring being interposed between a first end of said support element carrying the blade member and said electromagnetic actuator,   wherein said electromagnetic actuator comprises an electromagnet inserted into a structure supporting at least one permanent magnet for retaining the movable support member in the first working position,   the magnetic force retaining the support member in said first working position being nullified by the activation of the electromagnet to hence enable the spring to move the support member into the second working position.   
     
     
         2 . A device as claimed in  claim 1 , wherein said operator element comprises a textile machine for processing the textile yarn or a member for feeding the yarn to such a textile machine. 
     
     
         3 . A device as claimed in  claim 1 , wherein the spring is mounted about the support member, this support member having a second end inserted into the electromagnetic actuator. 
     
     
         4 . A device as claimed in  claim 1 , wherein the electromagnetic actuator is a bistable linear electromagnet. 
     
     
         5 . A device as claimed in  claim 1 , wherein the bistable electromagnetic actuator comprises a reversibly controllable electromagnet arranged to make the return movement of the support element from the second working position to the first reversible and automatic. 
     
     
         6 . A device as claimed in  claim 1 , wherein the blade member is arranged to retain the cut yarn within the housing after cutting the yarn. 
     
     
         7 . A device as claimed in  claim 1 , comprising an electronic circuit for connecting the device to a communication bus, said circuit containing an unequivocal identification code for identifying said device within the bus by said unequivocal code and to activate said device by serial command. 
     
     
         8 . A system for controlling the feed of at least one yarn to a textile machine, said system comprising:
 for said yarn at least one cutting device in accordance with  claim 1 ,   at least one member for monitoring a characteristic of said yarn, and   a unit for controlling the yarn feed to said textile machine,   wherein said device, said monitoring member and said control unit are connected via a serial line,   said cutting device and member for monitoring having their own unequivocal identification code for being controlled and commanded individually by said unit, said command being a serial command.   
     
     
         9 . The system of  claim 8 , wherein the monitored characteristic of said yarn, is its tension, velocity or shape.