Patent ID: 8807065

Claim:
A pan coating apparatus comprising: a rotary drum configured to be rotatable about a horizontal rotation axis, said rotary drum having an opening portion at an axial end portion of said rotary drum for allowing air to flow into said rotary drum; and a casing for housing said rotary drum, said casing including: a casing body; a rectangular parallelepiped box-shaped chamber door connected to said casing body by a hinge, and configured to be opened and closed in a horizontal direction relative to said casing body via said hinge, said chamber door being arranged to face said opening portion of said rotary drum, said chamber door having an air supply chamber formed therein so as to communicate with said opening portion of said rotary drum; and an air supply duct in said casing for supplying the air into said air supply chamber of said chamber door so that the air flows from said air supply duct to said air supply chamber of said chamber door, and then flows from said air supply chamber of said chamber door into said rotary drum through said opening portion, said air supply duct having an air supply hole opening into said air supply chamber at an upper portion of said chamber door, said opening portion of said rotary drum being located below said air supply hole so that air flowing from said air supply duct into said air supply chamber flows vertically through said air supply chamber and then flows into said opening portion of said rotary drum; wherein said air supply chamber has a sectional area larger than a sectional area of said air supply duct of said casing, and said air supply chamber has a sectional area larger than a sectional area of said opening portion of said rotary drum, so as to thereby reduce a flow rate of the air flowing from the air supply duct into the air supply chamber to then be supplied into said opening portion, and to stabilize airflow supplied to said rotary drum.