A production plant , in particular for air bending or bottom bending of a workpiece to be manufactured from a sheet metal, comprising - a bending press , in particular a press brake, with a machine frame , a lower press beam , an upper press beam as well as tool holders arranged or formed on the press beams , - at least one bending tool with at least one bending punch and at least one bending die , - a tool manipulation unit for moving the bending tool between the tool holders and a tool storage or for changing the position of the bending tool relative to the tool holders , - a protective unit with at least one protective element and an adjusting device , by means of which adjusting device the at least one protective element can be displaced relative to the bending press from a protective position which at least sectionally covers the bending tool into a release position which at least sectionally releases the bending tool , and the at least one protective element is formed to be plate-shaped and comprises a first longitudinal edge as well as a second longitudinal edge and a width of the protective element is defined by the two longitudinal edges , and wherein the protective unit is arranged in a feed region in front of the bending press , characterized in that - the adjusting device comprises at least two brackets and at least two holding arms each having a first end region and a second end region , and the holding arms are each mounted on the brackets in an articulated manner with their first end regions , and the holding arms are each connected to the at least one protective element on its first longitudinal edge facing away from the first press beam in an articulated manner with their second end regions , and the at least two brackets are arranged at a distance from one another in the direction of the longitudinal extent of the at least one protective element . - a bending press , in particular a press brake, with a machine frame , a lower press beam , an upper press beam as well as tool holders arranged or formed on the press beams , - at least one bending tool with at least one bending punch and at least one bending die , - a tool manipulation unit for moving the bending tool between the tool holders and a tool storage or for changing the position of the bending tool relative to the tool holders , - a protective unit with at least one protective element and an adjusting device , by means of which adjusting device the at least one protective element can be displaced relative to the bending press from a protective position which at least sectionally covers the bending tool into a release position which at least sectionally releases the bending tool , and the at least one protective element is formed to be plate-shaped and comprises a first longitudinal edge as well as a second longitudinal edge and a width of the protective element is defined by the two longitudinal edges , and wherein the protective unit is arranged in a feed region in front of the bending press , - the adjusting device comprises at least two brackets and at least two holding arms each having a first end region and a second end region , and the holding arms are each mounted on the brackets in an articulated manner with their first end regions , and the holding arms are each connected to the at least one protective element on its first longitudinal edge facing away from the first press beam in an articulated manner with their second end regions , and the at least two brackets are arranged at a distance from one another in the direction of the longitudinal extent of the at least one protective element . <EOS>