Abstract: A recording-head position adjustment mechanism includes a supporting member supporting a recording head that discharges a liquid droplet, the recording head including an abutting portion. The recording-head position adjustment mechanism includes a positioner on which the abutting portion abuts, the positioner to which the abutting portion is fixed so as to determine a position of the recording head in a longitudinal direction of the recording head with respect to the supporting member. A position of the positioner in the longitudinal direction with respect to the supporting member is adjustable.

Abstract: A discharge unit includes a head configured to discharge a liquid, a head mount to which the head is detachably attachable, and a holder configured to hold the head mount. The head mount includes multiple rotation mechanisms on multiple places of the head mount in a longitudinal direction of the head mount, and the holder is configured to rotatably and independently hold the multiple places of the head mount with the rotation mechanisms.

Abstract: A discharge unit includes a head configured to discharge a liquid, a head mount to which the head is detachably attachable, and a holder configured to hold the head mount. The head mount includes multiple rotation mechanisms on multiple places of the head mount in a longitudinal direction of the head mount, and the holder is configured to rotatably and independently hold the multiple places of the head mount with the rotation mechanisms.

Abstract: A cooling device includes a metal member, a cooling member, and a sheet-shaped thermal conductive member. The metal member thermally couples with an element that generates heat. The cooling member includes a channel for refrigerant to flow. The thermal conductive member includes an adhesive surface adhered to the metal member and a non-adhesive surface pressed against and thermally coupled in contact with the cooling member. The thermal conductive member and the cooling member are separable.