High speed printer with dual alternate sheet inverters

A single high speed print engine with a sheet output path in which closely spaced apart printed sheets printed by single high speed print engine are sequentially fed downstream at high speed in said sheet output path in a desired sheet sequence from said single high speed print engine,

• a cooperative dual inverter system comprising at least two independent but cooperatively operated sheet inverters mounted in communication with said same sheet output path,
• both of which sheet inverters have sheet input and sheet output connections with said sheet output path,
• and a control system directing selected ones of said closely sequentially spaced apart printed sheets from said sheet output path into and out of said two independent sheet inverters, via said respective sheet input and sheet output connections with the same said sheet output path, to invert alternate said sheets in both of said two independent sheet inverters in time-overlapping operations of said two independent sheet inverters and to return all of said sheets to said sheet path from both of said two independent sheet inverters in the same said closely spaced apart desired sheet sequence.