Abstract: A liquid supply device and an image forming apparatus in which the maintenance of a concentration detecting device is improved are obtained. The liquid supply device includes a flow passage through which liquid to be imparted to paper flows; a case including an inlet that is fixed to the flow passage and introduces a liquid from the flow passage, and an outlet that leads the liquid out to the flow passage; and a concentration detecting device that is openably and closably or attachably and detachably attached to the case and includes a detection unit, which detects the concentration of the liquid, at a position that faces the case.

Abstract: A liquid supply device and an image forming apparatus in which the maintenance of a concentration detecting device is improved are obtained. The liquid supply device includes a flow passage through which liquid to be imparted to paper flows; a case including an inlet that is fixed to the flow passage and introduces a liquid from the flow passage, and an outlet that leads the liquid out to the flow passage; and a concentration detecting device that is openably and closably or attachably and detachably attached to the case and includes a detection unit, which detects the concentration of the liquid, at a position that faces the case.

Abstract: A coating apparatus includes: a transport unit configured to transport an object to be coated; a coating liquid pan configured to store a coating liquid; a roller configured to be partially immersed in the coating liquid, rotate around an axis to draw up the coating liquid, and coat the coating liquid on the object; a support unit configured to detachably support the coating liquid pan and slidably supports the coating liquid pan; a positioning unit configured to position the coating liquid pan attached to the support unit at an attachment position; and a relative movement unit configured to relatively moves the support unit and the roller. When the support unit is located at an immersion position, a part of the roller is immersed in the coating liquid. When the support unit is located at a retraction position, the coating liquid pan is slidably supported without contact with the roller.

Abstract: A coating apparatus includes: a transport unit configured to transport an object to be coated; a coating liquid pan configured to store a coating liquid; a roller configured to be partially immersed in the coating liquid, rotate around an axis to draw up the coating liquid, and coat the coating liquid on the object; a support unit configured to detachably support the coating liquid pan and slidably supports the coating liquid pan; a positioning unit configured to position the coating liquid pan attached to the support unit at an attachment position; and a relative movement unit configured to relatively moves the support unit and the roller. When the support unit is located at an immersion position, a part of the roller is immersed in the coating liquid. When the support unit is located at a retraction position, the coating liquid pan is slidably supported without contact with the roller.

Abstract: A mechanism for compensating linear velocity differential that has a simple structure and with which it is possible to efficiently compensate difference in linear velocity between conveyance roller pairs. In a case in which a sheet is conveyed by two pairs of conveyance rollers, when the speed (linear velocity) at which the sheet is conveyed by one pair of conveyance rollers disposed downstream in the conveyance direction is higher than the speed at which the sheet is conveyed by the other pair of conveyance rollers disposed upstream, the linear velocity differential causes a tension in the sheet that is applied to the upstream pair of conveyance rollers. Due to this tension, a drive roller is rotated at a higher rotational speed than that of a drive gear, so that engaging prongs of the drive roller are respectively removed from engaging protrusions of the drive gear. Namely, the drive roller rotates and follows the downstream conveyance speed, whereby overload of the sheet is prevented.