Common polarity toner duplexing electrostatographic reproduction machine

A. common polarity duplexing electrostatographic reproduction machine comprising:

• a. first plural toner image producing electrostatographic modules each including a first image forming surface, image forming devices, and charged toner particles having a first polarity, for forming a first set of toner images having said first polarity;
• b. second plural toner image producing electrostatographic modules each having a second image forming surface, image forming devices, including charged toner particles having a polarity common with said first polarity for forming a second set of toner images having on said second image forming surface,
• c. a charged toner polarity reversing device mounted against each module of said second plural toner image producing electrostatographic modules for reversing a polarity of toner particles forming said second set of toner images from said first polarity to a second an opposite polarity;
• and
• d. a transfer device for transferring said second set of toner images having said second polarity onto a second side of the web of recording media.

An electrostatographic single-pass multiple modules electrostatographic reproduction machine (the machine) for forming a duplex image onto both sides of a web, the machine comprising:

• a. a first plurality of toner image producing electrostatographic modules (A, B, C, D, E) each having a first rotatable endless means including a first surface onto which one of a first set of toner images can be formed;
• b. a second plurality of toner image producing electrostatographic modules (A′, B′, C′, D′, E′) each having a second rotatable endless means including a second surface onto which one of a second set of toner images can be formed;
• c. conveyance means for conveying the web in succession past each said modules (A, A′;
• B, B′;
• C, C′;
• D, D′;
• and E, E′);
• d. transfer means for transferring the first set of toner images from each said first surface onto a first side of the web;
• and
• e. polarity reversing means mounted against said each module of said second plurality of toner image producing electrostatographic modules (A′, B′, C′, D′, E′) for reversing, directly on said second surface, a polarity of toner particles forming said second set of toner images from said first polarity to a second an opposite polarity.