Method of positioning a part

A device for positioning a part, comprising a drive for reciprocating the part between two end positions;

• means for generating a control signal for said drive during reaching the end positions;
• means for stopping said drive or changing its drive direction in response to the control signal;
• means for detecting a position of said drive during a first approach of at least one of the end positions by the part;
• means for storing the detected position of the drive, said means for stopping said drive or changing its drive direction being formed so that during further approaches of the end position by the part, the drive is stopped or the drive direction is changed before reaching the end positions unless a post adjustment is performed after a selected number of approaches of the part to at least one of the positions, by stopping the part at reaching one of the end positions, again detecting the position of the drive, storing said position detected against for use in place of said position previously stored.