A mortise die comprising: a punch (2); one portaprimordios (3) installed outside the punch (2) and supported by a cushion pin (4) and provided so that it can move freely up and down; a die (7) arranged to face the punch (2) and capable of moving up and down, whereby, in operation of the die, a thin plate (51), mounted portaprimordios (3) is pressed between portaprimordios (3) and the die (7) and is drawn by the punch (2) by moving the die (7) downward, and a stabilizer assembly comprising a plurality of boxes (5) arranged peripherally around portaprimordios (3) between the pin cushion (4) and portaprimordios (3) so as to be movable, freely upward and downward by the cushion pin (4), a damper spring (11) gas, interposed between each box (5) and portaprimordios (3) in order to define unhuelgo boot for portaprimordios (3) between the boxes (5) and portaprimordios (3), and a lever boot (13) provided rotatably in each box (5) and arranged to cooperate with an actuator (31) for toggle boot (13), said actuator (31) being disposed at a position of the die (7) facing the starting lever (13), in which the starting lever (13) is adapted to compress portaprimordios (3), in operation of the die, in order to make the portaprimordios (3) start with actuation of the coil springs (11) of gas before the die (7) collides with the veneer (51) in the portaprimordios (3).
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