Grinding device for scarf sanding

A grinding device for grinding a workpiece, the grinding device comprising:

• a main frame that rotates about a rotary shaft and is able to move in parallel on a horizontal plane vertically intersecting an axial direction;
• a first swingable frame that is disposed so as to be spaced from the main frame in the axial direction and is swingably mounted to the main frame;
• a pitch feed frame that is mounted to the first swingable frame so as to be able to move in parallel on a horizontal plane intersecting the axial direction;
• and
• a second swingable frame that is swingably mounted to the pitch feed frame, wherein
• the first swingable frame is coupled to the main frame at a first pivot provided so as to be displaced from a shaft center, and is able to swing relative to the main frame about the first pivot,
• the second swingable frame has a contact that comes into contact with a surface of the workpiece and a grindstone that grinds the workpiece, is coupled to the pitch feed frame at a second pivot provided on a perpendicular extending from a center of a contact position of the contact that is displaced from the shaft center, and is able to swing relative to the pitch feed frame about the second pivot, and
• the grindstone is mounted to the second swingable frame so as to grind a portion in a vicinity of the contact position of the contact.