One-way controllable chock for door

The utility model relates to a stopper for controlling the motion of a door system, which is installed on a moving part of a bearing guidance system. The utility model is characterized in that a support bracket of a swinging arm is connected to a casing, and a right and a left torsional springs are respectively arranged between the support bracket of a swinging arm and the casing. A wedge block is pressed on the casing by a pressing plate, and an electromagnetic sucking iron arranged in the casing is connected with a cover plate. A steel ball is pressed on the wedge block by a small compression spring which is connected between the steel ball and a cage. An armature is connected with the cage through a liner, and the compression spring is arranged between the cage and the liner. The utility model has the advantages that the stopper is installed on the moving part of the bearing guidance system. Because a stop point of the stopper is arranged on the bearing guidance system (a guide column), a linear unidirectional overrunning clutch is adopted. The stop is relieved by the move of the steel ball driven by the attracting of an electromagnet, and the linear unidirectional overrunning clutch is directly relieved. The utility model has the advantages of stable and reliable stopping effects, simple and reasonable structure and convenient use and maintenance.