Sheet metal processing machine (1) for processing metal sheets (2) along a processing line (B), the sheet metal processing machine (1) having a stop system with at least one stop element (A1, A2, A3, A4, A5) for an edge (R) of the Sheet metal (2) and an adjustment mechanism (6) for adjusting the position of the at least one stop element, the adjustment mechanism (6) having two support rails (7, 8) arranged parallel to one another and a plurality of finger strips (F1, F2, F3, F4, F5), each finger strip (F1, F2, F3, F4, F5) being articulated to both support rails (7, 8) and with its front end (E) the position of the at least one stop element (A1, A2, A3, A4, A5) prescribes or forms one, with each support rail (7, 8) being articulated via compensating levers (L1, L2, R1, R2) to two carriages (9, 10) of the adjustment mechanism (6) arranged on the left and right of the center of the support rail is, each along a designated Füh tion (11, 12) can be moved perpendicular to the processing line (B), with the support rails (7, 8) in a basic position of the adjustment mechanism (6) parallel to the processing line (B) and in an inclined position of the adjustment mechanism (6) obliquely to the processing line ( B) are aligned, while the finger strips (F1, F2, F3, F4, F5) are aligned perpendicular to the processing line (B) both in the basic position and in the inclined position, and the adjustment mechanism (6) attaches to at least one support rail (7 , 8) has acting centering mechanism (13) with which the pivot point (P1, P2) of both support rails (7, 8) is held in a central area of the respective support rail (7, 8) during the transition from the basic position to the inclined position.
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