Press drive with several modes of operating a press and method for operating a press drive

Press drive (15) for a press, comprising an elbow lever drive (20), which includes a first lever (45) and a second lever (46) which are supported by an elbow joint (48) so as to be pivotable relative to each other,

• wherein the elbow lever drive (20) has a first support bearing (49) via which the first lever (45) is supported on a press frame (16) and a second support bearing (50) via which the second lever (46) is connected to a plunger (17) of the press;
• a connecting rod (47) whose one end is pivotally supported on the elbow joint (48) and whose other end is connected to an eccentric (21) of an eccentric drive (19);
• an adjustment arrangement (27) including a guide arrangement (28) operatively arranged on the press frame (16), the guide arrangement (28) operatively supports the eccentric drive (19) which is movable along the guide arrangement (28) in an adjustment direction (R) along an adjustment path (x), the adjustment arrangement (27) for adjusting the eccentric (21) relative to the first support bearing (49), in the adjustment direction (R) along the adjustment path (x), wherein the position of the eccentric axis (22) of the eccentric (21) or, respectively, the eccentric drive (19) may be changed with respect to the first support bearing (49);
• and,
• the adjustment arrangement (27) further including a locking means (55) operatively engageable with the guide arrangement (28), the locking means (55) operatively switchable between a release position in which movement of the eccentric drive (19) in an adjustment direction (R) along the adjustment path (x) is permitted and an arrest position in which movement of the eccentric drive (19) in an adjustment direction (R) along the adjustment path (x) is blocked or at least inhibited for bypassing any adjustment by the adjustment arrangement (27) of the eccentric (21) or respectively, the eccentric drive (19) during operation of the press in a mode of operation (B).