Color image forming apparatus

A color image forming apparatus for forming a color image by superimposing a plurality of color toner images on a recording material, comprising:

• toner image forming means for forming the color toner images on an image bearing member moving endlessly;
• transfer material bearing means moving endlessly by supporting the recording material to convey it to a transfer station of said image bearing member;
• transfer means for transferring the toner image onto the recording material supported by said transfer material conveying means formed on said image bearing member at the transfer position;
• and
• drive means having a drive system which slightly differentiates a moving speed of said image bearing member from a moving speed of said transfer material bearing means at said transfer station,
• wherein in order to slightly differentiate the moving speeds, when a rotational angular velocity of said image bearing member is .omega..sub.1, a peripheral speed of said image bearing member is V.sub.1, a rotational angular velocity of said transfer material bearing means is .omega..sub.2 and a peripheral speed of said transfer material bearing means is V.sub.2, the following relation is established
• .omega..sub.1 =1/k.omega..sub.2 (k=. . . , 1/4, 1/3, 1/2, 1, 2, 3, 4, . . . )
• and the peripheral speeds V.sub.1 and V.sub.2 are differentiated slightly from each other.

A color image forming apparatus for forming a color image by superimposing a plurality of color toner images on a recording material, comprising:

• toner image forming means for forming the toner color images on an image bearing member moving endlessly;
• transfer material bearing means moving endlessly by supporting the recording material to convey it to a transfer station of said image bearing member;
• transfer means for transferring the toner image onto the recording material supported by said transfer material conveying means formed on said image bearing member at the transfer position;
• and
• a drive system comprising a first drive gear of said image bearing member and a second drive gear of said transfer material bearing means meshed with the first gear;
• wherein when a radius of said image bearing member is r.sub.1, a radius of a pitch circle of said first drive gear of said image bearing member is D.sub.1, the number of teeth of said first drive gear is N.sub.1, a radius of said transfer material bearing means is r.sub.2, a radius of a pitch circle of said second drive gear of said transfer material bearing means is D.sub.2 and the number of teeth of the second drive gear is N.sub.2, the following relation is established:
• N.sub.1 =kN.sub.2 (k=. . . , 1/4, 1/3, 1/2, 1, 2, 3, 4, . . . )
• and a moving speed of said image bearing member is slightly differentiated from that of transfer material bearing means by equalizing radius r.sub.1 and D.sub.1 and differentiating radius r.sub.2 and D.sub.2 or by equalizing radius r.sub.2 and D.sub.2 and differentiating radius r.sub.1 and D.sub.1.

A multiple image forming apparatus for forming a multiple image by superimposing a plurality of images on a transfer material, comprising:

• image bearing means for bearing an image thereon;
• a transfer material bearing member for bearing the transfer material, the image born on said image bearing means being superimposedly transferred sequentially to the transfer material born on said transfer material bearing member at a transfer position;
• absorbing means for absorbing the transfer material to said transfer material bearing member prior to start of the image transferring to the transfer material;
• and
• drive means for driving said image bearing means and said transfer material bearing member so that, when the image born on said image bearing means is transferred onto the transfer material, a moving speed of said image bearing means at the transfer position differs from a moving speed of said transfer material bearing member at the transfer position, wherein during a time when the image born on said image bearing means is transferred onto the transfer material born on said transfer material bearing member, the transfer material and said transfer material bearing member move at the same speed while said image bearing means and said transfer material bearing member move at the different speeds.

A multiple image forming apparatus for forming a multiple image by superimposing a plurality of images on a transfer material, comprising:

• image bearing means for bearing an image thereon, said image bearing means having a drum-like configuration;
• a transfer material bearing member for bearing the transfer material thereon, said transfer material bearing member having a drum-like configuration, the image born on said image bearing means being superimposedly transferred sequentially to the transfer material born on said transfer material bearing member at a transfer position;
• and
• drive means for driving said image bearing means and said transfer material bearing member so that values of r.sub.1 /r.sub.2 and w.sub.2 /w.sub.1 are different from each other when the image born on said image bearing means is transferred onto the recording material, wherein a radius of said image bearing means at the transfer position is r.sub.1, a rotational angular velocity of said image bearing means is w.sub.1, a radius of said transfer material bearing member at the transfer position is r.sub.2, and a rotational angular velocity of said transfer material bearing member is w.sub.2, a value of w.sub.2 /w.sub.1, k (k=. . . 1/4, 1/3, 1/2, 1, 2, 3, 4, . . . ).