Abstract: An adjustment device of a grinding machine contains: a grinding unit and a tool fixing unit. The grinding unit includes a first guide rail and a second guide rail. The tool fixing unit includes a horizontal rotation mechanism, a locating portion, a third guide rail, a fourth guide rail, and a fifth guide rail. The locating portion is cylindrical, parallel to a second XY plane, and has a rotation axis defined on a center of the locating portion, such that the locating portion rotates along the rotation axis and a tool is positioned on the locating portion to rotatably grind the workpiece at different angles.

Abstract: The present invention discloses a power-saving electrical device, which employs a mechanical power system energized by an initial power supply to rotate a flywheel. Due to the principle of inertia, the flywheel enables the mechanical power system to provide a large torque. The flywheel is connected to an electrical generator so that the mechanical power system can drive the electrical generator to generate a large amount of electrical power, thus achieving the effect of energy saving. In addition, surplus power at the electrical generator can be fed back to a power storage device, which has the function of providing electrical power to initiate the mechanical power system.

Abstract: A structure of a keyboard is combinable with an electronic device, and includes a keyboard body and a frame. The frame is of a U-shape having two limbs that has end portions slidably fit in elongate slots defined in two side walls of the keyboard body to be movable along the slots and rotatable with respect thereto. When the keyboard body and the frame are assembled together, the keyboard structure defines in a top thereof a receptacle for receiving and retaining the electronic device. The keyboard body includes a signal output structure engageable with a signal transmission interface of the electronic device. When combined together for operation, the electronic device is movable with the frame to expose keys of the keyboard. The electronic device is detachable from the keyboard structure for independent operation thereby reducing the overall size for easy carrying.

Abstract: A structure of a keyboard is combinable with an electronic device, and includes a keyboard body and a frame. The frame is of a U-shape having two limbs that has end portions slidably fit in elongate slots defined in two side walls of the keyboard body to be movable along the slots and rotatable with respect thereto. When the keyboard body and the frame are assembled together, the keyboard structure defines in a top thereof a receptacle for receiving and retaining the electronic device. The keyboard body includes a signal output structure engageable with a signal transmission interface of the electronic device. When combined together for operation, the electronic device is movable with the frame to expose keys of the keyboard. The electronic device is detachable from the keyboard structure for independent operation thereby reducing the overall size for easy carrying.