Raw material supply device

A raw material supply device comprising:

• a transport section that transports a raw material containing fibers and supplies the raw material to a processing section that processes the raw material;
• a stopper that blocks transport of a portion of the raw material transported by the transport section, the stopper including a first member and a second member each of which partially blocks the transport of the portion of the raw material;
• and
• a controller that controls an operation of the stopper to adjust a supply amount of the raw material to the processing section,
• the controller, to adjust the supply amount of the raw material,
• controlling both of the first member and the second member not to block the transport in a first state,
• controlling only the first member to block the transport while controlling the second member not to block the transport in a second state after the first state,
• controlling only the second member to block the transport while controlling the first member not to block the transport in a third state after the second state, and
• controlling both of the first member and the second member to block the transport in a fourth state after the third state.