JP2017219756A5 - - Google Patents

Claims (4)

Image forming means for forming a toner image, an elastically deformable image carrier that carries the toner image formed by the image forming means on its surface, and a nip formation that forms a transfer nip in contact with the image carrier An image forming apparatus comprising: a member; and a transfer power source that outputs a transfer bias for transferring a toner image on the surface of the image carrier to a recording sheet sandwiched between the transfer nips.
The image bearing member has a micro rubber hardness of 45 or more and 65 or less,
An image forming apparatus wherein the relative dielectric constant of the toner used for the image forming means is 3.9 or less. The image forming apparatus according to claim 1,
An image forming apparatus, wherein the image bearing member has a micro rubber hardness of 55 or more and 65 or less. The image forming apparatus according to claim 1 or 2,
As the transfer bias, the transfer power supply is configured to output a voltage composed of a superimposed voltage by superimposing a DC voltage and an AC voltage,
Information acquisition means for acquiring information relating to the surface smoothness of a recording sheet to be transferred with a toner image;
I based on the acquisition result of the information by the information acquisition means, a highly smooth mode for transferring the toner image to a high smooth sheet excellent in surface smoothness, low poor surface smoothness than the plateau Namerashi over preparative The transfer mode is switched between a low smoothing mode for transferring a toner image onto a smooth sheet, and in the high smoothing mode, a toner is nipped from the image carrier side in the transfer nip among the two peak values in the transfer bias. While transferring the transfer bias whose reverse peak side duty, which is the duty on the side of the peak value opposite to the transfer peak value that is more strongly electrostatically moved on the member side, is 50% or more from the transfer power supply, In the low smoothing mode, a transfer bias having a reverse peak side duty different from that in the high smoothing mode and 50% or less is transferred. An image forming apparatus characterized in that a control means for outputting from the source. The image forming apparatus according to claim 3.
In the high smoothing mode, a transfer bias having a reverse peak duty exceeding 50 [%] is output from the transfer power supply, while in the low smoothing mode, the polarity is reversed within one cycle and the reverse peak duty is 50 [%]. The image forming apparatus is characterized in that the control means is configured to perform control to output a transfer bias that is less than 1 from the transfer power supply.