Patent ID: 7861945

Claim:
A rotary atomizing head type coating apparatus comprising: a hollow rotational shaft driven by a motor; a main atomizer body of a bell or a cup shape having a mount base at a rear side to be mounted on said rotational shaft, a paint reservoir at a depth from a front side and a paint spreading surface provided in a front side of said paint reservoir for spreading paint into the shape of a thin film; a partition member located on an inner peripheral side of said main atomizer body to partition off said paint reservoir from said paint spreading surface, and including paint outlet holes to let paint in said paint reservoir flow out therethrough toward said paint spreading surface; and a paint tube passed through said rotational shaft and having an outlet end opened into said paint reservoir to supply paint thereto; a first wash fluid discharging passage provided at said main atomizer body and including an inlet end opened at the rear side of said paint reservoir and an outlet end opened at a back side of said main atomizer body; a second wash fluid discharging passage provided at said main atomizer body and including an inlet end opened at the rear side of said paint reservoir and an outlet end opened into said paint reservoir; a wash fluid tube extended side by side with said paint tube to supply a wash fluid toward said first wash fluid discharging passage and said second wash fluid discharging passage; distribution means provided at an outlet end of said wash fluid tube for distributing a wash fluid toward inlet ends of said first wash fluid discharging passage and said second wash fluid discharging passage; said distribution means including a fin wall member fitted on said paint tube to turn a flow direction of an effluent wash fluid from said wash fluid tube toward said first wash fluid discharging passage, and axial through holes bored in said fin wall member to conduct an effluent wash fluid from said wash fluid tube toward said second wash fluid discharging passage; and said wash fluid tube including a check valve at an outlet end at a position behind said fin wall member to prevent a reverse flow of said wash fluid.