Speed detection device and passenger conveyer device

A speed monitoring device comprising:

• a transmission rotor disposed on a shaft side surface of a shaft of which the speed is to be measured and rotating with rotation of the shaft of which the speed is to be measured;
• an encoder having an input shaft, the input shaft of the encoder being connected to the transmission rotor and rotating with rotation of the transmission rotor;
• a mounting bracket for securing the transmission rotor and the encoder to a position where they are to be mounted;
• a positioning portion disposed at a connection position of the input shaft of the encoder and the transmission rotor, for preventing a relative movement between the encoder and the transmission rotor;
• wherein the transmission rotor has a stepped mounting hole, and the positioning portion comprises an elastic plug;
• wherein a first side of the stepped mounting hole is engaged with the input shaft of the encoder, and the elastic plug is engaged with a second side of the stepped mounting hole and the input shaft of the encoder.

A speed monitoring device, characterized by comprising:

• a transmission rotor disposed on a shaft side surface of a shaft of which the speed is to be measured and rotating with rotation of the shaft of which the speed is to be measured;
• an encoder having an input shaft, the input shaft of the encoder being connected to the transmission rotor and rotating with rotation of the transmission rotor;
• a mounting bracket for securing the transmission rotor and the encoder to a position where they are to be mounted;
• a pressure bearing bracket, wherein the transmission rotor and the encoder are fixed to the pressure bearing bracket through the mounting bracket;
• and in an operation state, the pressure bearing bracket is used for providing pressure from the transmission rotor toward the shaft of which the speed is to be measured;
• the pressure bearing bracket including a torque fulcrum, an elastic member located on a first side of the torque fulcrum, and a second side opposite to the first side, wherein the transmission rotor and the encoder are connected through the mounting bracket to the pressure bearing bracket at the second side of the torque fulcrum and the elastic member acts as a source of pressure that presses the transmission rotor against the shaft of which the speed is to be measured;
• an elastic force control portion coupled to the elastic member and configured to control a degree of compression of the elastic member;
• wherein a window is further disposed on the pressure bearing bracket and is disposed at a connection position of the elastic force control portion and the elastic member for checking a current compression degree of the elastic member.