Method and device for applying at least one substance to yarn in motion

Abstract

Apparatus for depositing a substance on threads ( 2, 3, 4; 25; 50, 51, 52 ) in a textile machine is designed in a way such that the substance is deposited in pulses the frequency and/or amplitudes of which are controlled as a function of the speed and/or tension of moving threads ( 2, 3, 4 ).

1 . A method for applying at least one-substance on moving threads ( 2 ,  3 ,  4 ;  25 ;  50 ,  51 ,  52 ) in a textile machine, 
 characterized 
 by predetermining a quantity of a minimum of one substance to be deposited per unit length of thread ( 2 ,  3 ,  4 ;  25 ;  50 ,  51 ,  52 ), said applied quantity being varied as a function of variations in the speed and/or the tension of the threads ( 2 , 3 , 4 ;  25 ;  50 , 51 , 52 ).  
   
     
     
         2 . Method as claimed in  claim 1 , characterized in that the minimum of one substance is deposited in the form of consecutive pulses, the pulse repetition rate, i.e. frequency and/or amplitude, being altered to change the applied quantity.  
     
     
         3 . Method as claimed in either of claims  1  and  2 , characterized in that two or more complementary substances are applied on the same threads ( 2 ,  3 ,  4 ;  25 ;  50 ,  51 ,  52 ).  
     
     
         4 . Method as claimed in one of claims  1  through  3 , characterized in that the minimum of one substance is deposited in the form of spray pulses.  
     
     
         5 . Method as claimed in one of claims  2  through  4 , characterized in that the pulses are generated piezo-electrically.  
     
     
         6 . Method as claimed in one of claims  2  through  5 , characterized in that a minimum value is set for the pulse frequency as a function of the magnitude of the spray jet and the speed of the threads ( 2 ,  3 ,  4 ;  25 ;  50 ,  51 ,  52 ).  
     
     
         7 . Method as claimed in  claim 6 , characterized in that the pulse frequency is larger than 500 kHz.  
     
     
         8 . Apparatus for applying at least one substance on moving threads ( 2 ,  3 ,  4 ;  25 ;  50 ,  51 ,  52 ) in a textile machine, 
 characterized in that 
 it includes means ( 27 ,  40 ,  44 ) to apply at least one substance and which is adjustable to allow establishing a predetermined substance quantity per unit length of the moving threads ( 2 ,  3 ,  4 ;  25 ;  50 ,  51 ,  52 ) to be applied to said threads, said means being connected to a control unit ( 20 ) to change said applied quantity of the least one substance as a function of changes in the speed and/or tension of the said moving threads.  
   
     
     
         9 . Apparatus as claimed in  claim 8 , characterized in that it includes at least one nozzle ( 29 ) to spray the minimum of one substance, said nozzle being controlled electrically and preferably in a piezoelectric manner in order to discharge spray pulses at a variable frequency and/or at variable amplitude.  
     
     
         10 . Apparatus as claimed in either of claims  8  and  9 , characterized in that it includes several nozzles ( 29 ) which spray in each case another substance on the threads ( 2 ,  3 ,  4 ;  25 ;  50 ,  51 ,  52 ) and which preferably are controlled independently from each other by the control unit ( 20 ).