Image forming machine

An image forming machine comprising:

• image bearing means moved sequentially through a charging zone, an exposure zone, a development zone, a transfer zone, and a cleaning zone;
• charging means for charging the image bearing means in the charging zone;
• exposure means for selectively static-eliminating the image bearing means in the exposure zone to form an electrostatic latent image on the image bearing means;
• reversal development means for developing the electrostatic latent image into a toner image in the development zone;
• transfer means for transferring the toner image on the image bearing means onto an image receiving member in the transfer zone;
• and
• cleaning means for removing a toner remaining on the image bearing means in the cleaning zone after transfer,
• the transfer means including a rotationally driven transfer belt, and transfer voltage applicator means for applying a transfer voltage to a back side of the transfer belt, and wherein
• the reversal development means develops the image bearing means over a predetermined effective development width,
• the transfer voltage applicator means applies the transfer voltage to the transfer belt over a predetermined effective transfer width,
• a face side of the transfer belt is brought into contact with the image bearing means via the image receiving member and directly over a predetermined effective contact width, and
• the effective contact width is larger than the effective development width and larger than the effective transfer width.

An image forming machine comprising:

• image bearing means moved sequentially through a charging zone, an exposure zone, a development zone, a transfer zone, and a cleaning zone;
• charging means for charging the image bearing means in the charging zone;
• exposure means for selectively static-eliminating the image bearing means in the exposure zone to form an electrostatic latent image on the image bearing means;
• reversal development means for developing the electrostatic latent image into a toner image in the development zone;
• transfer means for transferring the toner image on the image bearing means onto an image receiving member in the transfer zone;
• and
• cleaning means for removing a toner remaining on the image bearing means in the cleaning zone after transfer,
• the transfer means including a rotationally driven transfer belt, and transfer voltage applicator means for applying a transfer voltage to a back side of the transfer belt, and wherein
• the cleaning means removes the toner remaining on the image bearing means over a predetermined effective cleaning width,
• the transfer voltage applicator means applies the transfer voltage to the transfer belt over a predetermined effective transfer width,
• a face side of the transfer belt is brought into contact with the image bearing means via the image receiving member and directly over a predetermined effective contact width, and
• the effective contact width is larger than the effective cleaning width and larger than the effective transfer width.

An image forming machine comprising:

• image bearing means moved sequentially through a charging zone, an exposure zone, a development zone, a transfer zone, and a cleaning zone;
• charging means for charging the image bearing means in the charging zone;
• exposure means for selectively static-eliminating the image bearing means in the exposure zone to form an electrostatic latent image on the image bearing means;
• reversal development means for developing the electrostatic latent image into a toner image in the development zone;
• transfer means for transferring the toner image on the image bearing means onto an image receiving member in the transfer zone;
• and
• cleaning means for removing a toner remaining on the image bearing means in the cleaning zone after transfer,
• the transfer means including a rotationally driven transfer belt, and transfer voltage applicator means for applying a transfer voltage to a back side of the transfer belt, and wherein
• the charging means includes a corona discharger for charging the image bearing means over a predetermined effective charging width, and a pair of spacing setting rollers rotatably mounted on the corona discharger and brought into contact with the image bearing means on both sides of the effective charging width, and
• a length between outside ends of the pair of spacing setting rollers is larger than the effective charging width and smaller than the effective contact width.