Abstract: A rotation velocity adjusting module includes a fixed axle, a rotating component and a rotation velocity adjusting mechanism. The rotating component is pivoted to the fixed axle. The rotation velocity adjusting mechanism includes a driven component, a driving component and a contact component. The driven component is rotatably connected to the rotating component. The driving component and the contact component are disposed on the driven component. When a rotation velocity of the rotating component reaches a threshold value, the driving component drives the driven component to rotate by the change of centrifugal force, so as to switch states of the contact component.

Abstract: A rotation velocity adjusting module includes a fixed axle, a rotating component and a rotation velocity adjusting mechanism. The rotating component is pivoted to the fixed axle. The rotation velocity adjusting mechanism includes a driven component, a driving component and a contact component. The driven component is rotatably connected to the rotating component. The driving component and the contact component are disposed on the driven component. When a rotation velocity of the rotating component reaches a threshold value, the driving component drives the driven component to rotate by the change of centrifugal force, so as to switch states of the contact component.

Abstract: A printer is for accommodating paper roll and includes main body, cover, first printing set and detecting module. The main body has an accommodating space and a shaft located in the accommodating space. The cover is pivoted to the main body. The first printing set is disposed in the main body. The detecting module includes a switch and a flexible member being disposed close to the switch and having a fixed section and a movable section which are opposite to each other. The movable section is movably located between the paper inlet and the paper roll. When the movable section is pressed by the paper sheet and moved toward the switch, the movable section presses against the switch. When the movable section of the flexible member is not being pressed by the paper sheet, the movable section is located in a first detecting area.

Abstract: An electronic device and an operation method thereof are provided. The electronic device includes a fixing element, a first main body and a second main body. The fixing element has a first arc-shaped groove, which passes through the fixing element. The second main body has a second arc-shaped groove and a first straight groove, wherein the second arc-shaped groove and the first straight groove are interconnected. The first main body has a first protrusion which passes through the first arc-shaped groove and lodges in the first straight groove. While the first protrusion is slid for a first predetermined distance from one end of the first straight groove, the first arc-shaped groove and the second arc-shaped groove are overlapped, so that the first protrusion is slid along the first arc-shaped groove which overlaps the second arc-shaped groove for driving the first main body.

Abstract: A handheld electronic device includes a casing, a touch panel, a display and a controller. Either one of the display and the touch panel is fixed onto the casing. The other one of the display and the touch panel is movably coupled to the casing and disposed above the casing or at the exterior of the casing. The controller is installed in the casing and electrically coupled to the touch panel and the display. The operation of the handheld electronic device depends on the positional relation between the display and the touch panel. While maintaining the operation and viewing quality, the cost and the level of complexity of the design of the handheld electronic device can be reduced to improve the product competitiveness effectively.

Abstract: An electronic device and an operation method thereof are provided. The electronic device includes a fixing element, a first main body and a second main body. The fixing element has a first arc-shaped groove, which passes through the fixing element. The second main body has a second arc-shaped groove and a first straight groove, wherein the second arc-shaped groove and the first straight groove are interconnected. The first main body has a first protrusion which passes through the first arc-shaped groove and lodges in the first straight groove. While the first protrusion is slid for a first predetermined distance from one end of the first straight groove, the first arc-shaped groove and the second arc-shaped groove are overlapped, so that the first protrusion is slid along the first arc-shaped groove which overlaps the second arc-shaped groove for driving the first main body.