A baler for compressing loose material and for tying the compressed material into bales, the baler comprising: - a press box that includes a fill in opening through which the loose material moves into the press box; - a press channel that is horizontally arranged at an outlet of the press box; - a press plunger with vertical grooves in a front surface of the press plate arranged at a front side of the press plunger wherein the press plunger is movable back and forth horizontally from a starting position through the press box into a proximity of a beginning of the press channel which defines a front position of the press plunger, - a tying unit including upward and downward move able pull needles for tying a finished pressed bale with a tying material; wherein - the tying unit includes a band pull station arranged at a top side and a band guide station corresponding thereto and arranged below the base of the baler; - the tying unit is arranged outside of the press box in a transition section between the press box and the press channel; - a position of the vertical grooves correlates with a movement direction of the pull needles when the press plate in the baler is arranged in a most forward position, - openings are provided in a top side of the press for pulling the pull needles through; - a respective head piece is arranged at free ends of the pull needle which are provided for gripping the tying material wherein the head pieces respectively include a catch hook at their free end section, characterized in that - a sliding surface configured at a guide element of the band pull station and the respective support surface at the head element form a rotation safety in combination; - wherein a length of the sliding surface is large enough so that the head piece is supported safe against rotation until it penetrates a respective first vertical groove of the press plate; and - a safety against rotation of the catch hook is provided by the respective vertical groove from this position down to the lower position of the pull needle, - so that catch hooks provided at the head pieces always take a defined position from a beginning of their movement to an end of their movement for pulling up a section of the tie up material. - a press box that includes a fill in opening through which the loose material moves into the press box; - a press channel that is horizontally arranged at an outlet of the press box; - a press plunger with vertical grooves in a front surface of the press plate arranged at a front side of the press plunger wherein the press plunger is movable back and forth horizontally from a starting position through the press box into a proximity of a beginning of the press channel which defines a front position of the press plunger, - a tying unit including upward and downward move able pull needles for tying a finished pressed bale with a tying material; wherein - the tying unit includes a band pull station arranged at a top side and a band guide station corresponding thereto and arranged below the base of the baler; - the tying unit is arranged outside of the press box in a transition section between the press box and the press channel; - a position of the vertical grooves correlates with a movement direction of the pull needles when the press plate in the baler is arranged in a most forward position, - openings are provided in a top side of the press for pulling the pull needles through; - a respective head piece is arranged at free ends of the pull needle which are provided for gripping the tying material wherein the head pieces respectively include a catch hook at their free end section, - a sliding surface configured at a guide element of the band pull station and the respective support surface at the head element form a rotation safety in combination; - wherein a length of the sliding surface is large enough so that the head piece is supported safe against rotation until it penetrates a respective first vertical groove of the press plate; and - a safety against rotation of the catch hook is provided by the respective vertical groove from this position down to the lower position of the pull needle, - so that catch hooks provided at the head pieces always take a defined position from a beginning of their movement to an end of their movement for pulling up a section of the tie up material.