Master and slave of robot tool changing system

1. A slave combining with a master in a robot tool changing system, the slave comprising:

a combination groove into which a protrusion of the master is inserted;

at least one plate displacement measurer arranged at a circumferential edge of a hole of the combination groove, and including a lower plate, an upper plate arranged in an upper direction to correspond to the lower plate, and at least one elastic connection leg for connecting the upper plate and the lower plate; and

a slave communicator for communicating with the master,

wherein the upper plate comprises a permanent magnet, and

wherein, when power is applied to an electromagnet of the master so that the upper plate is moved to a magnetic coupling region of the protrusion by magnetism, the plate displacement measurer transmits, to the master, position error information between the upper plate and the lower plate connected to the upper plate, through the slave communicator.

2. The slave of claim 1 , wherein at least one fastening fixing groove is arranged in the combination groove, and

wherein, when the protrusion is inserted into the combination groove and power is applied to the electromagnet of the master, the fastening part of the master is fixed to the fastening fixing groove.

3. The slave of claim 1 , wherein each of the at least one plate displacement measurer calculates the position error information based on at least one among extended length information of each of the at least one elastic connection legs, displacement information from a center of the upper plate to a center of the lower plate, displacement information from the center of the lower plate to an elastic connection leg that contacts the lower plate, and displacement information from the center of the upper plate to an elastic connection leg that contacts the upper plate.

4. The slave of claim 1 , wherein the lower plate is fixed to the circumferential edge of the hole of the combination groove.

5. The slave of claim 4 , wherein the lower plate comprises a permanent magnet, and

wherein the lower plate is fixed to the circumferential edge of the hole of the combination groove by magnetism.

6. The slave of claim 1 , wherein; when vertical positions of the upper plates are different from each other in a predetermined range, vertical error information is transmitted to the master through the slave communicator.

7. A master combining with at least one slave in a robot tool changing system, the master comprising:

a body;

a protrusion protruding from the body in one direction and which is inserted into a combination groove of a slave;

at least one fastening part arranged in a predetermined region of the protrusion and fixing the protrusion to the combination groove;

an electromagnet arranged in a predetermined internal region of the protrusion;

a master communicator for communicating with the slave; and

a controller,

wherein, when power is applied to the electromagnet so that upper plates of the slave are moved by magnetism to a magnetic coupling region of the protrusion, the controller controls the master communicator to receive, from the slave, position error information between the upper plates and lower plates of the slave, and

wherein, when power is applied to the electromagnet and a vertical position error is measured by at least one plate displacement measurer of the slave in a vertical direction of the upper plates of the slave in a predetermined range, the controller receives the position error information in the form of the vertical position error from the slave through the master communicator.

8. The master of claim 7 , wherein the controller moves the protrusion based on horizontal direction position error information between the upper plates and the lower plates, which is received through the master communicator, and

wherein, when the protrusion and the combination groove are aligned with each other, the controller moves the protrusion in a directly downward direction to insert the protrusion into the combination groove.

9. The master of claim 8 , wherein, when the protrusion is inserted into the combination groove, the controller applies power so as to change a magnetization direction of the electromagnet, and fixes the fastening part to the fastening fixing groove of the slave.

10. The master of claim 7 , wherein the fastening parts are plural, and

wherein each of the fastening parts have a rectangular shape.

11. The master of claim 7 , wherein an insulator is arranged in a partial region of the protrusion, adjacent to the magnetic coupling region.

12. The master of claim 7 , wherein the controller stops applying power to the electromagnet, and separates the upper plates from the protrusion.

13. The master of claim 12 , wherein the controller realigns a position of the protrusion and applies power to the electromagnet again.