Invisible sliding door

A sliding door, comprising:

• a bar-shaped rail slidably supported by a rail anchor mounted in a vehicle;
• a body part fixed to one end of the rail;
• a main arm having one end hinge-connected with a rear of the body part;
• a driving bar having one end hinge-connected with a front of the body part;
• a first link having both ends hinge-connected with a middle region of the main arm and a middle region of the driving bar respectively;
• a second link having one end hinge-connected with a middle region of the main arm and the other end hinge-connected with a first slot formed at the other end of the driving bar;
• a door part having one end hinge-connected with the other end of the main arm and having the other end formed with a second slot hinge-connected with the other end of the second link through the first slot;
• a gear part formed at the one end of the main bar hinge-connected with the body part and rotated together with the main bar;
• a first drum rotatably mounted to the body part and engaged to the gear part to be rotated by the gear part;
• a first cable having both ends each connected with the first drum and the rail anchor and slidably moving the rail in a rail anchor direction while being wound around the first drum at the time of a rotation of the first drum;
• a second drum rotatably mounted at the other end of the rail;
• a second cable having one end wound around the second drum and having the other end connected with the first drum to rotate the second drum while being released from the second drum, simultaneously with being wound around the first drum at the time of a reverse rotation of the first drum;
• and
• a third cable having both ends each connected with the second drum and the rail anchor and slidably moving the rail so as to return to an original position while being wound around the second drum at the time of the rotation of the second drum.