Mounting apparatus and film supply apparatus

A film supply apparatus, comprising:

• a film winding mechanism, rotating a winding reel to wind in a film spanning from a dispensing reel to the winding reel;
• a tension detecting part, detecting a tension of the film after a predetermined amount of the film is wound by the film winding mechanism;
• and
• a control part, rotating the winding reel by a winding motor to adjust the tension based on the tension detected by the tension detecting part, wherein the film winding mechanism comprises:
• a motor arm, directly or indirectly connected with a rotation shaft of the winding motor and extending in a predetermined direction;
• a reel arm, directly or indirectly connected with a rotation shaft of the winding reel, extending in a direction corresponding to the motor arm, and rotating with the motor arm about a same center;
• and
• an elastic member, wherein one end of the elastic member is connected with the motor arm, another end of the elastic member is connected with the reel arm, and the elastic member causes the reel arm to follow the motor arm, and
• the tension detecting part detects the tension as excessively small in a case where an interval between the motor arm and the reel arm in a rotating direction is less than a first predetermined value, and detects the tension as excessively large in a case where the interval is greater than a second predetermined value greater than the first predetermined value, and
• the control part rotates the winding reel via the winding motor in a winding direction at a time when the tension is detected as excessively small, and rotates the winding reel via the winding motor in a reverse direction with respect to the winding direction at a time when the tension is detected as excessively large.