| 摘要 |
Disclosed is a Hall detection device for a thickness of a sheet medium, comprising a mounting rack, a reference shaft (1) and a floating wheel assembly (2), wherein the floating wheel assembly (2) comprises a bracket (21) and at least one floating wheel (22), one end of the bracket (21) being mounted on the mounting rack via a floating wheel rotary shaft (23) and the other end thereof being rotationally fitted with the floating wheel (22) so as to form a free end, a torsional spring (24) is provided between the floating wheel rotary shaft (23) and the bracket (21) so that the floating wheel (22) elastically bears against the reference shaft (1), and the bracket (21) is fixedly mounted with a detection block (3) and a sensor (4) for detecting a displacement amount of the detection block (3); and the connection line of the axial centres of the floating wheel (22) and the reference shaft (1) and the detection centres of the detection block (3) and the sensor (4) are located in one straight line, the distance from the axial centre of the floating wheel rotary shaft (23) to a point of tangency (a) of the floating wheel (22) and the reference shaft (1) is the same as the distance from the axial centre of the floating wheel rotary shaft to a surface detection central point (b) of the detection block (3), and an angle of 45 degrees is formed between the connection line from the point of tangency (a) to the axial centre of the floating wheel rotary shaft (23) and the orientation (p) of a sheet medium conveying path. |
