apparatus 37 includes a corotron 38 for neutralizing charges remaining on the particles and a rotating brush 39 which operates in conjunction with a vacuum system to remove residual toner particles from the brush belt 11 is driven in the direction shown by the solid line arrow by a constant speed drive motor 30 directly coupled to belt driving roller 15 by a suitable drive chain or timing belt 42 a timing gear 43 is carried on the output shaft of motor 30 gear 43 having a predetermined number of teeth cooperable with magnetic pickup element 44 mounted on the machine frame adjacent thereto during rotation of gear 43 pickup 44 generates a series of closely spaced signal pulses which are input to control logic 45 via line 44 39 pulse like signals from signal generator 31 are input to control logic 45 via line 31 39 the signal pulse in lines 44 39 31 39 cooperate to operate the various components of reproduction machine 10 in an integrated timed manner via control logic 45 for this purpose the control logic 45 for machine 10 includes a suitable counting mechanism for counting and identifying individual pulses the pulse train from pickup 44 is fed to control logic 45 together with the pulse like signals from pickup 32 of signal generator 31 in operation the pulses from pickup 32 are used to mark or set the count each time fingers 28 reach a preset point in their rotation individual pulses from the resulting blocks of pulses obtained.