Image forming apparatus with plural transfer means and selecting mechanism for selecting from among a plurality of image bearing members

An image forming apparatus comprising:

• a first image bearing member for bearing a toner image;
• first collecting means for collecting toner on said first image bearing member;
• a second image bearing member for bearing a toner image;
• second collecting means for collecting toner on said second image bearing member;
• a moving member;
• first transfer means for electrostatically transferring the toner image on said first image bearing member to said moving member or a transfer material borne by said moving member at a first transfer position;
• and
• second transfer means for electrostatically transferring the toner image on said second image bearing member to said moving member or said transfer material borne by said moving member at a second transfer position,
• wherein a direction of an electric field formed at said first transfer position for transferring toner on said moving member to said first image bearing member is opposed to a direction of an electric field formed at said second transfer position for transferring toner on said moving member to said second image bearing member.