Random signal generator for the manufacture of slub open end spun yarn

Apparatus to provide a pre-selected number of random pulses per unit time comprising:

• a multi-bit shift register including a means to supply an input logic pulse to said shift register which includes a feed back pulse from at least one of the later stages of said shift register to the input of said shift register to provide a plurality of random pulses from said shift register, a digital counter operably associated with said shift register and being activated by a pulse from said shift register to countdown to a pre-selected value, detection means to detect when said counter has completed the countdown to its pre-selected value to provide an output pulse and a timer means operably associated with said detection means and receiving the output pulse therefrom to transfer the contents of said shift register to said digital counter and to control the operation of a desired machine, said timer means including a minimum time timer means to allow a clock pulse to be delivered to said counter to count down said counter to a pre-selected value when the minimum time timer has timed out.