Image forming apparatus
AssigneeRicoh Company, Ltd.
InventorsSeiichi Kogure, Shinji Imoto
Life of this patent
Estimating the term…
Abstract
An image forming apparatus can form a high-quality image while acquiring a stable conveyance performance. A conveyance belt (21) conveys a recording medium (12) by attracting the recording medium (12) by an electrostatic force. A recording head (7) discharges liquid droplets toward the recording medium (12) being conveyed by the conveyance belt (21). Alternating positive and negative electric charges are applied onto the conveyance belt (21). A conveyance speed is controlled in accordance with a charge period length of the alternating positive and negative electric charges applied onto the conveyance belt (21).
Claims14
An image forming apparatus comprising:
- a conveyance belt that conveys a recording medium by attracting the recording medium by an electrostatic force;
- and
- a recording head that discharges liquid droplets toward the recording medium being conveyed by the conveyance belt at a conveyance speed,
- wherein the image forming apparatus further comprises:
- a charging part that applies alternating positive and negative electric charges onto said conveyance belt;
- and
- a control part that controls said conveyance speed and controls said charging part to apply the charge only when said conveyance speed is less than a maximum conveyance speed during a line feed operation,
- wherein said charging part applies the positive and negative electric charges only during a period from a state where said conveyance belt is stopped until said maximum conveyance speed is reached.
An image forming apparatus comprising:
- a conveyance belt configured to convey a recording medium by attracting the recording medium by an electrostatic force;
- a recording head configured to discharge liquid droplets toward the recording medium being conveyed by the conveyance belt at a conveyance speed;
- a charging part configured to apply alternating positive and negative electric charges onto said conveyance belt;
- and
- a control part configured to control said conveyance speed and control said charging part to apply the charge only when said conveyance speed is less than a maximum conveyance speed during a line feed operation,
- wherein said charging part applies the positive and negative electric charges only during a period from a state where said conveyance belt is at said maximum conveyance speed until said conveyance belt is stopped.
An image forming apparatus comprising:
- a conveyance belt configured to convey a recording medium at a conveyance speed by attracting the recording medium to the conveyance belt by an electrostatic force;
- a recording head configured to discharge liquid droplets toward the recording medium attracted to the conveyance belt;
- a charging part configured to apply alternating positive and negative electric charges onto the conveyance belt;
- and
- a control part configured to control said conveyance speed and control said charging part, wherein
- the conveyance speed of the conveyance belt is controlled by the control part to perform a line feed operation consisting of, in order, a period of stopped motion, a period of increasing speed, a period of predetermined maximum speed, a period of decreasing speed, and a period of stopped motion and
- the charging part is controlled by the control part to apply the positive and negative charges only during at least one of the period of increasing speed and the period of decreasing speed.
Dependencies are inferred from the claim text.