Rotation angle-adjustable rotating device

A rotation angle-adjustable rotating device comprising:

• a base member having a peripheral wall that defines a receiving space, and an annular mounting part that is disposed securely on said peripheral wall around said receiving space;
• a drive unit including a motor and a drive shaft driven by said motor;
• a mounting seat sleeved securely on said drive shaft for co-rotation therewith and formed with an engaging member that is disposed in said receiving space;
• and
• a direction control unit including a resistance providing member that is mounted adjustably and securely on said mounting part, that extends into said receiving space, and that is engageable with said engaging member of said mounting seat, said direction control unit further including a control mechanism which is associated with said drive shaft in such a manner that rotation direction of said drive shaft is reversed when said engaging member comes into contact with said resistance providing member to provide a resistance to the rotation of said drive shaft and when the resistance is greater than a predetermined amount of torque of said motor, said resistance providing member being position-adjustable on said mounting part so as to be disposed at different angular positions relative to said mounting part.