Image forming apparatus and treatment liquid application device

摘要

An image forming apparatus includes an image forming unit to form an image on a recording medium and a treatment-liquid application device to apply a treatment liquid to the medium. The application device includes a conveyance roller to convey the medium, an application roller to apply the liquid to the medium, a squeeze roller to spread the liquid on the application roller to form a thin layer of the liquid on the application roller, and a housing member to retain the application roller and the squeeze roller within the housing member and cover outer circumferential surfaces of the application roller and the squeeze roller. The housing member has an opening to contact the application roller with the conveyance roller through the opening and a storage portion to store the liquid. The housing member is rotatable while retaining the application roller and the conveyance roller within the housing member.

主权项

1. An image forming apparatus comprising:
an image forming unit to form an image on a recording medium; and a treatment-liquid application device to apply a treatment liquid to the recording medium, the treatment-liquid application device including: a conveyance roller to convey the recording medium; an application roller to apply the treatment liquid to the recording medium; a squeeze roller to spread the treatment liquid on the application roller to form a thin layer of the treatment liquid on the application roller; a housing member to retain the application roller and the squeeze roller within the housing member and cover outer circumferential surfaces of the application roller and the squeeze roller, the housing member having an opening to contact the application roller with the conveyance roller through the opening and a storage portion to store the treatment liquid, the housing member being rotatable while retaining the application roller and the conveyance roller within the housing member; plural cam gears rotatably mounted to respective ends of the application roller, each cam gear amongst the plural cam gears comprising a gear and a cam integrally formed with the gear; a rack configured to engage the gears of the cam gears and rotate the cam gears; and a fix portion disposed to contact the cam of the cam gear in a state in which the application roller is separated from the conveyance roller, wherein when the application roller applies the treatment liquid to the recording medium, the application roller transfers the thin layer of the treatment liquid, which was spread on the application roller by the squeeze roller, onto the recording medium with the application roller contacting the recording medium.