Image forming apparatus and control method therefor

An image forming apparatus comprising:

• an image forming means for forming an image;
• an intermediate transferring body to which the image is to be transferred;
• a driver for driving the intermediate transferring body at one of multiple speeds, which at least include a standard speed mode and a low speed mode;
• a detecting means for detecting a traveling speed for the intermediate transferring body;
• and
• a control means for controlling a drive condition for the intermediate transferring body based on the traveling speed detected by the detecting means,
• wherein the control means employs the traveling speed detected in the standard speed mode for the intermediate transferring body to determine the drive condition for the intermediate transferring body in the low speed mode.

A control method, for an image forming apparatus that drives conveying means for conveying, in one of multiple speed modes including at least a standard speed mode and a low speed mode, a transfer medium to which a formed image is to be transferred, comprising:

• a detection step of detecting, in the standard speed mode, a conveying speed for the conveying means;
• and
• a control step of employing the conveying speed detected in the detection step to control a drive condition for the conveying means,
• whereby in the control step, based on the conveying speed detected in the standard speed mode for the conveying means, a drive condition in the low speed mode is determined for the conveying means.

A control method, for an image forming apparatus that is capable of driving an intermediate transferring body, to which a formed image is to be transferred, in one of multiple speed modes, including at least a standard speed mode and a low speed mode, comprising:

• a detection step of detecting a traveling speed for the intermediate transferring body;
• and
• a control step of employing the traveling speed detected in the detection step to control a drive condition for the intermediate transferring body,
• wherein, in the control step, based on the traveling speed detected in the standard speed mode for the intermediate transferring body, a drive condition in the low speed mode is determined for the intermediate transferring body.