Safety mechanism comprising a height-adjustable holding device

Safety device in comprising a beam emitting and beam receiving device, for a manufacturing machine, with at least one retaining mechanism designed in the form of an adjusting mechanism for the safety device on a press beam which can be fitted with bending tools in a tool mounting device, whereby the adjusting mechanism holds, in a relatively adjustable manner relative to the press beam, the beam emitter and/or beam receiver in a direction running perpendicular to a standing surface between at least one working position and a park position in a guiding arrangement, wherein the adjusting mechanism has a guiding and locking device switching a locking element of a locking device between a released position and a retained position, and the retaining mechanism for the beam emitter and/or the beam receiver automatically locks in relation to the press beam in the park position upon a linear displacement in a direction opposite to the working plane on reaching the park position.