Patent ID: 9581952
Date: 2017-02-28
CPC Classifications: G03G

Claim:
1. A humidification device for humidifying a sheet, the humidification device comprising: a pair of humidification rollers configured to come into contact with each other so as to form a nip portion, and configured to humidify the sheet which passes through the nip portion; a liquid-supply roller configured to rotate while being in contact with one roller of the pair of humidification rollers so as to supply liquid to one roller of the pair of humidification rollers; a switching unit which switches a positional relationship between one roller of the pair of humidification rollers and the liquid-supply roller between a separate state where one roller of the pair of humidification rollers and the liquid-supply roller are separated from each other and a contact state where one roller of the pair of humidification rollers and the liquid-supply roller are in contact with each other; a detector located on the upstream side of the pair of humidification rollers and which detects the sheet; a drive unit which rotates the liquid-supply roller; and a controller which controls the switching unit and the drive unit, wherein the controller controls the switching unit and the drive unit such that the liquid-supply roller rotates in the separate state and when the sheet is detected by the detector and a predetermined time has passed, the switching unit switches from the separate state to the contact state.