System for suppressing one-sided movement and zigzag running of a conveyor belt in an image forming apparatus

An image forming apparatus, comprising:

• means for forming an image on an image carrier means;
• a conveyor belt for conveying an image receiving medium to the image carrier means;
• means, having a first roller which has a diameter that is different at both ends and a taper size T expressed by T=(D-d)/L, wherein D is the diameter at the large diameter side, d is the diameter at the small diameter side and L is the length of the first roller, wherein T is more than 2.31.times.10.sup.-3 and a coefficient of static friction is less than 0.26, and a second roller which is opposing to the first roller, for moving the conveyor belt in a prescribed direction by rotating the first and the second rollers in a state where the conveyor belt is put over the first and the second rollers;
• means for applying a load set at more than 3 kg to the conveyor belt;
• and
• means for transferring the image formed on the image carrier means onto the image receiving medium.

An image forming apparatus, comprising:

• means for forming an image on an image carrier means;
• a conveyor belt for conveying an image receiving medium to the image carrier means;
• means, having a first roller which has a diameter that is different at both ends and a taper size T expressed by T=(D-d)/L, wherein D is the diameter at the large diameter side, d is the diameter at the small diameter side and L is the length of the first roller, wherein T is more than 2.31.times.10.sup.-3 and a coefficient of static friction is less than 0.26, and a second roller which is opposing to the first roller, for moving the conveyor belt in a prescribed direction by rotating the first and the second rollers in a state where the conveyor belt is put over the first and the second rollers;
• means for transferring the image formed on the image carrier means onto the image receiving medium;
• and
• a first and a second tension applying means for applying a tension to the conveyor belt by giving a force to the small diameter side and the large diameter side of the first roller, wherein the force given to the small diameter side is smaller than the force given to the larger diameter side.

An image forming apparatus, comprising:

• means for forming an image on an image carrier;
• a conveyor belt for conveying an image formed on the image carrier;
• and
• means, having a first roller which has a diameter that is different at both ends and a taper size T expressed by T=(D-d)/L, wherein D is the diameter at the large diameter side, d is the diameter at the small diameter side and L is the length of the first roller, wherein T is more than 2.31.times.10.sup.-3 and a coefficient of static friction is less than 0.26, and a second roller which is opposing to the first roller, for moving the conveyor belt in a prescribed direction by rotating the first and the second rollers in a state where the conveyor belt is put over the first and the second rollers.