Abstract: A dust-proof sensing device includes a mechanical body, a feeding path, a first photoelectric sensor disposed above the feeding path, a second photoelectric sensor disposed under the feeding path, and an upper bracket. The mechanical body has a feeding path. The upper bracket is mounted above the feeding path. The upper bracket has an upper fastening portion fastened to the mechanical body, an upper wedging portion fastened at the upper fastening portion, an L-shaped upper light guiding holder fastened at the upper fastening portion, and a first light guider fastened at the upper light guiding holder. The upper fastening portion has a first inclined section. An inner edge of an upper surface of the first inclined section is intersected with a top edge of an inner surface of the upper wedging portion to form a clamping angle.

Abstract: A dust-proof sensing device includes a mechanical body, a feeding path, a first photoelectric sensor disposed above the feeding path, a second photoelectric sensor disposed under the feeding path, and an upper bracket. The mechanical body has a feeding path. The upper bracket is mounted above the feeding path. The upper bracket has an upper fastening portion fastened to the mechanical body, an upper wedging portion fastened at the upper fastening portion, an L-shaped upper light guiding holder fastened at the upper fastening portion, and a first light guider fastened at the upper light guiding holder. The upper fastening portion has a first inclined section. An inner edge of an upper surface of the first inclined section is intersected with a top edge of an inner surface of the upper wedging portion to form a clamping angle.

Abstract: A detachable feed roller for using in the automatic feeder includes: a rotating shaft provided with a first connection structure arranged at the end of the rotating shaft and an actuating part; a fixed feed roller arranged around the rotating shaft and driven by the rotating shaft; a one-way feed roller arranged around the rotating shaft and provided with a cam part; a transmitting rotor arranged around the rotating shaft and, the transmitting rotor being disposed between the actuating part and the cam part; wherein, the transmitting rotor is pushed toward the one-way feed roller while the rotating shaft rotates forward in accordance to the transmitting rotor; and pushed away from the one-way feed roller while the one-way feed roller rotates forward in accordance to the transmitting rotor.

Abstract: A paper feeding device includes a motor, a pickup roller assembly, a velocity sensor and a feeding roller assembly. The pickup roller assembly is driven by the motor for picking up the papers. The velocity sensor is mounted to the pickup roller assembly for detecting rotating speeds of the pickup roller assembly so as to detect speeds of feeding forward the papers. The feeding roller assembly is driven by the motor for continuing feeding forward the papers. A speed discrepancy will be generated between the rotating speed of the pickup roller assembly after the one of the papers is fed to the feeding roller assembly and the rotating speed of the pickup roller assembly which just picks up the one of the papers, when the speed discrepancy reaches a preset value set by the scanner, the scanner is triggered to start scanning.