Abstract: An access control device includes a main body, a rotating mechanism, a camera module, a first driving motor and a second driving motor. The rotating mechanism includes a first rotating shaft and a second rotating shaft. The rotating mechanism is pivotally coupled to the main body through the second rotating shaft. The camera module is fixed on the first rotating shaft. The first driving motor is drivingly coupled to the first rotating shaft. The first driving motor drives rotation of the first rotating shaft. Consequently, a photographing angle of the camera module is adjusted in a first angular range. The second driving motor is drivingly coupled to the second rotating shaft. The second driving motor drives rotation of the second rotating shaft. Consequently, the photographing angle of the camera module is adjusted in a second angular range.

Abstract: A three-dimensional printing device with a stirring mechanism includes a vessel (1), a molding platform (2), a light source module (3) and a rotary stirring structure (4). The molding platform (2) is elevatably installed above the vessel (1); the light source module (3) is installed under the vessel (1); and the rotary stirring structure (4) includes a magnetic stirrer (41), a magnetic turntable (42) and a driver (43). The magnetic stirrer (41) is placed inside the vessel (1); the magnetic turntable (42) is installed under the vessel (1) and magnetically attracted to the magnetic stirrer (41); the driver (43) drives the magnetic turntable (42) to rotate and move, so as to drive the magnetic stirrer (41) to rotate and move with respect to the vessel (1) and improve the convenience of using the three-dimensional printing device (10).

Abstract: A three-dimensional printer includes a platform, a lifting mechanism and a carrying base, wherein the lifting mechanism includes a vertical screw, a linear sliding rail, a movable component, a stand and a pair of limiting members. The linear sliding rail is arranged with the vertical screw in parallel. One end of the movable component is disposed with an inner screw hole while the other end has a guide portion. The guide portion is vertically connected to the linear sliding rail in a slidable manner. The stand is disposed on the horizontal two sides of the movable component. The pair of limiting members is respectively sandwiched between the two sides of the movable component and the stand. One end of each limiting member is fixed to the movable component while the other end has a sliding portion. Each sliding portion abuts on the stand.