Roll-forming unit for roll-forming a metal strip with a plurality of roll-forming frames arranged one behind the other which sequentially form and/or guide the metal strip; comprising: a) at least one sensor roll-forming frame which is arranged in the plurality of roll-forming frames arranged one behind the other and which forms, bends and/or guides the metal strip; b) a first roller and a second roller attached rotatably about a respective rotational axis to the respective sensor roll-forming frame and retained in position by it; the first and the second roller being arranged such that they clamp the metal strip therebetween; c) at least one sensor (1, 2) arranged in the respective sensor roll-forming frame so as to measure a force, an oscillation or a torque exerted on the metal strip by the respective sensor roll-forming frame and to generate a corresponding sensor signal; d) a microprocessor unit with a detection algorithm adapted to compare the sensor signal with a respective predefined setpoint value or a setpoint value curve with a respective predefined allowable tolerance range, where, when the sensor signal is detected to lie within the allowable tolerance range, a first state is recognized and otherwise, at least one second state of the respective sensor roll-forming frame; e) a display unit displaying the detected first and/or second states of the respective sensor roll-forming frame; characterized in that f) the microprocessor unit comprises a second detection algorithm which is equipped with a pattern recognition that compares the at least one sensor signal or the development of the sensor signal with a recognition pattern or recognition parameters and detects, if a predefined correlation value is exceeded, an additional state, such as a bearing damage, a change in strip thickness, a displacement or warpage of the sensor roll-forming frame with respect to an adjacent roll-forming frame or another type of change. a) at least one sensor roll-forming frame which is arranged in the plurality of roll-forming frames arranged one behind the other and which forms, bends and/or guides the metal strip; b) a first roller and a second roller attached rotatably about a respective rotational axis to the respective sensor roll-forming frame and retained in position by it; the first and the second roller being arranged such that they clamp the metal strip therebetween; c) at least one sensor (1, 2) arranged in the respective sensor roll-forming frame so as to measure a force, an oscillation or a torque exerted on the metal strip by the respective sensor roll-forming frame and to generate a corresponding sensor signal; d) a microprocessor unit with a detection algorithm adapted to compare the sensor signal with a respective predefined setpoint value or a setpoint value curve with a respective predefined allowable tolerance range, where, when the sensor signal is detected to lie within the allowable tolerance range, a first state is recognized and otherwise, at least one second state of the respective sensor roll-forming frame; e) a display unit displaying the detected first and/or second states of the respective sensor roll-forming frame; characterized in that f) the microprocessor unit comprises a second detection algorithm which is equipped with a pattern recognition that compares the at least one sensor signal or the development of the sensor signal with a recognition pattern or recognition parameters and detects, if a predefined correlation value is exceeded, an additional state, such as a bearing damage, a change in strip thickness, a displacement or warpage of the sensor roll-forming frame with respect to an adjacent roll-forming frame or another type of change.