Head restraint which is movable in the X direction

1. A headrest comprising:

a housing which can be moved at least partially relative to a retention rod toward and away from the head of the seat occupant,

wherein the headrest is configured to be arranged on a backrest of a vehicle seat through the housing;

a rotor provided on the housing and having a positive-locking or non-positive locking mechanism,

wherein the positive-locking or non-positive locking mechanism extends along an axis parallel to a longitudinal axis,

wherein the rotor and the positive-locking or non-positive locking mechanism are configured to move congruently and rotate congruently about an axis parallel to the longitudinal axis,

wherein the longitudinal axis extends in a direction toward and away from the head of the seat occupant,

wherein the positive-locking or non-positive-locking mechanism can selectively be brought into engagement with a locking mechanism connected to the retention rod and is configured to fix the housing in a particular position relative to the retention rod; and

a bearing for the rotor, wherein the bearing is arranged on the housing and the rotor is provided so as to be able to be rotated and longitudinally displaced relative to the bearing.

2. The headrest as claimed in claim 1 , wherein the positive-locking or non-positive locking mechanism is teeth and the rotor is a rod, wherein the teeth are on two opposing sides of the rod.

3. The headrest as claimed in claim 1 , wherein the bearing has a control pin which cooperates with a control cam of the rotor, wherein the control pin protrudes from a radial periphery of the bearing and is configured to protrude into the control cam.

4. The headrest as claimed in claim 3 , wherein the control cam is a control slot.

5. The headrest as claimed in claim 1 , wherein a resilient mechanism is provided for pretensioning the rotor and the bearing into a locking position with the locking mechanism.

6. The headrest as claimed in claim 1 , wherein the rotor is supported on the housing with axial play.

7. A method for adjusting a headrest having a housing which can be moved at least partially relative to a retention rod toward and away from the head of the seat occupant, wherein the headrest is configured to be arranged on a backrest of a vehicle seat through the housing, a rotor provided on the housing and having a positive-locking or non-positive-locking mechanism, wherein the positive-locking or non-positive locking mechanism extends along an axis parallel to a longitudinal axis, wherein the rotor and the positive-locking or non-positive locking mechanism are configured to move congruently and rotate congruently about an axis parallel to the longitudinal axis, wherein the longitudinal axis extends in a direction toward and away from the head of the seat occupant, and a bearing for the rotor that is provided on the housing, the method comprising:

selectively bringing the positive-locking or non-positive-locking mechanism into engagement with a locking mechanism connected to the retention rod and fixing the housing in a particular position relative to the retention rod;

moving the housing forward toward the head of the seat occupant and then backward away from the head of the seat occupant in order to move the housing away from the head of the seat occupant; and

rotating and longitudinally displacing the rotor relative to the bearing.

8. The method as claimed in claim 7 , wherein the rotor is rotated forward during the movement.

9. The method as claimed in claim 7 , wherein the rotor engages in an unlocking position when it has reached its foremost position.

10. The method as claimed in claim 7 , wherein the rotor engages in an unlocking position during the forward movement.