Sliding door system having a locking mechanism

1. A drive device in combination with a sliding door system comprising at least one door leaf guided along a transom, the drive device comprising:

a housing mountable on the transom;

a pulley, the pulley being rotatably mounted on the housing and having a flange with locking elements, the flange having a surface facing the housing, the locking elements being adjacent to the housing and comprising teeth on the surface of the flange;

an endless traction mechanism guided around the pulley for moving the at least one door leaf linked to the traction mechanism;

complementary locking elements movable relative to the housing to engage the locking elements on the flange and thereby prevent rotation of the pulley;

an electromechanical actuation device which moves the complementary locking elements toward the locking elements in response to an impulse emitted by a locking control, the electromechanical actuation device comprising a push rod and a locking bolt supported by the housing and displaceable by the push-rod;

an axially movable toothed disc having mating teeth which form the complementary locking elements; and

compression springs urging said toothed disc to abut against the housing;

wherein the toothed disc is movable toward the flange of the pulley against forces of the compression springs.

2. The drive device of claim 1 , wherein, when the at least one door leaf is unlocked relative to the transom, the toothed disc abuts against an outside wall of the housing creating a gap between the mating teeth of the toothed disc and the teeth of the pulley.

3. The drive device of claim 2 , further comprising a thrust plate in the housing, and connecting tenons displaceably passing through the outside wall of the housing and fixing the toothed disc relative to the thrust plate.

4. The drive device of claim 3 , wherein the compression springs are disposed between the thrust plate and an inside surface of the outside wall of the housing.

5. The drive device of claim 4 , wherein each of the compression springs comprises a coil spring surrounding a respective one of said connecting tenons.

6. The drive device of claim 4 , wherein the compression springs comprise a leaf spring.

7. The drive device of claim 3 , wherein the push-rod of the electromechanical actuation device is fixed to the locking bolt, the push-rod and the locking bolt being coaxial with respect to each other, the thrust plate and the locking bolt cooperating so that an axial movement of the locking bolt causes a movement of the thrust plate in a direction which is perpendicular to the axial movement of the locking bolt.

8. The thrust plate of claim 7 , wherein the locking bolt has a recess having a slide ramp, the drive device further comprising a slide block having a complementary slide ramp, the slide block being received in the recess with the complementary slide ramp facing the slide ramp of the recess when the at least one door leaf is unlocked relative to the transom.

9. The drive device of claim 1 , wherein, the electromechanical actuation device uses an electromagnet to electromagnetically actuate the push-rod, the drive device further comprising a spring disposed between the housing and the locking bolt, the spring urging the locking bolt toward an initial position of the locking bolt.

10. The drive device of claim 1 , wherein the electromechanical actuation device comprises an electric motor.

11. A drive device for a sliding door system comprising at least one door leaf guided along a transom, the drive device comprising:

a housing mountable on the transom;

a pulley, the pulley being rotatably mounted on the housing and drivable in rotation, the pulley being mounted for rotation on the housing and having a flange with locking elements, the locking elements being adjacent to the housing;

an endless traction mechanism guided around the pulley for moving the at least one door leaf linked to the traction mechanism;

complementary locking elements movable relative to the housing to engage the locking elements on the flange and thereby prevent rotation of the pulley; and

an electromechanical actuation device which moves the complementary locking elements toward the locking elements in response to an impulse emitted by a locking control;

wherein the electromechanical actuation device comprises a push rod and a locking bolt supported by the housing and displaceable by the push-rod, the drive device further comprising compression springs urging a toothed disc comprising the complementary locking elements to abut against the housing, the toothed disc being movable toward the flange of the pulley against forces of the compression springs.

12. The drive device of claim 11 , wherein, when the at least one door leaf is unlocked relative to the transom, the toothed disc abuts against an outside wall of the housing creating a gap between the complementary locking elements of the toothed disc and the locking elements of the driven pulley.

13. The drive device of claim 12 , further comprising a thrust plate in the housing, and connecting tenons displaceably passing through the outside wall of the housing and fixing the toothed disc relative to the thrust plate.

14. The drive device of claim 13 , wherein the compression springs are disposed between the thrust plate and an inside surface of the outside wall of the housing.

15. The drive device of claim 14 , wherein each of the compression springs comprises a coil spring surrounding a respective one of said connecting tenons.

16. The drive device of claim 14 , wherein the compression springs comprise a leaf spring.

17. The drive device of claim 13 , wherein the push-rod of the electromechanical actuation device is fixed to the locking bolt, the push-rod and the locking bolt being coaxial, with respect to each other the thrust plate and the locking bolt cooperation so that an axial movement of the locking bolt causes a movement of the thrust plate in a direction which is perpendicular to the axial movement of the locking bolt.

18. The drive device of claim 17 , wherein the locking bolt has a recess having a slide ramp, the thrust plate comprising a slide block having a complementary slide ramp, the slide block being received in the recess with the complementary slide ramp facing the slide ramp of the recess when the at least one door leaf is unlocked relative to the transom.

19. The drive device of claim 11 , wherein, the electromechanical actuation device uses an electromagnet to electromagnetically actuate the push-rod, the drive device further comprising a spring disposed between the housing and the locking bolt, the spring urging the locking bolt toward an initial position of the locking bolt.