Elevator device

1 . An elevator device, comprising:

a car which travels through a hoistway;

a code tape suspended in the hoistway;

a code read sensor which reads a code described in the code tape;

a code tape elongation/contraction detection unit which detects an amount of elongation or contraction of the code tape;

a reference marker which is installed in the hoistway and which indicates a reference position of the car;

a reference sensor which is installed in the car and which detects the reference marker; and

circuitry which, when a condition based on the amount of elongation or contraction is satisfied, move the car to the reference position in accordance with a detection result of the reference sensor, cause position information of the car determined based on the code to be read as reference position information, calculate compensatory position information based on the reference position information, and control the car using the compensatory position information, wherein

the condition is that the amount of elongation or contraction from the time of a previous calculation of the compensatory position information is equal to or larger than a predetermined amount.

2 . An elevator device, comprising:

a car which travels through a hoistway;

a code tape suspended in the hoistway;

a code read sensor which reads a code described in the code tape;

a code tape elongation/contraction detection unit which detects an amount of elongation or contraction of the code tape; and

circuitry which calculate compensatory position information based on position information of the car determined based on the code and the amount of elongation or contraction of the code tape and which control the car using the compensatory position information.

3 . The elevator device according to claim 1 , wherein the code tape elongation/contraction detection unit includes an elongation/contraction detection rod of which one end is supported by a rotatable support point being fixed to the hoistway, which has an angle detection unit fixed to another end thereof, and which is supported between the one end and the other end so as to be constrained in a vertical direction with respect to the code tape, and the amount of elongation or contraction is detected based on an angle of the elongation/contraction detection rod having been detected by the angle detection unit.

4 . The elevator device according to claim 3 , wherein

the angle detection unit is constituted of a switch block which moves up and down due to a rotation of the elongation/contraction detection rod and a switch which is operated due to a contact made by the switch block, wherein

the code tape elongation/contraction detection unit detects the amount of elongation or contraction by an operation of the switch.

5 . The elevator device according to claim 3 , wherein

the angle detection unit is an encoder, and

the code tape elongation/contraction detection unit detects the amount of elongation or contraction due to an angle detected by the encoder.

6 . The elevator device according to claim 1 , wherein

the code tape elongation/contraction detection unit includes:

a wire fixed to an end of the code tape;

a pulley on which the wire is hung and which rotates due to an elongation or a contraction of the code tape; and

an encoder which detects an angle of the pulley, and

the amount of elongation or contraction is detected due to the angle.

7 . The elevator device according to claim 1 , wherein the code tape elongation/contraction detection unit is a thermometer provided in the hoistway, and the amount of elongation or contraction is detected in accordance with a temperature measured by the thermometer.

8 . The elevator device according to claim 2 , wherein the code tape elongation/contraction detection unit includes an elongation/contraction detection rod of which one end is supported by a rotatable support point being fixed to the hoistway, which has an angle detection unit fixed to another end thereof, and which is supported between the one end and the other end so as to be constrained in a vertical direction with respect to the code tape, and the amount of elongation or contraction is detected based on an angle of the elongation/contraction detection rod having been detected by the angle detection unit.

9 . The elevator device according to claim 8 , wherein

the angle detection unit is constituted of a switch block which moves up and down due to a rotation of the elongation/contraction detection rod and a switch which is operated due to a contact made by the switch block, wherein

the code tape elongation/contraction detection unit detects the amount of elongation or contraction by an operation of the switch.

10 . The elevator device according to claim 8 , wherein

the angle detection unit is an encoder, and

the code tape elongation/contraction detection unit detects the amount of elongation or contraction due to an angle detected by the encoder.

11 . The elevator device according to claim 2 , wherein

the code tape elongation/contraction detection unit includes:

a wire fixed to an end of the code tape;

a pulley on which the wire is hung and which rotates due to an elongation or a contraction of the code tape; and

an encoder which detects an angle of the pulley, and

the amount of elongation or contraction is detected due to the angle.

12 . The elevator device according to claim 2 , wherein the code tape elongation/contraction detection unit is a thermometer provided in the hoistway, and the amount of elongation or contraction is detected in accordance with a temperature measured by the thermometer.