| 摘要 |
<p>The invention concerns a nibbling tool for cutting sheet material having a body (12) in which a rotary shaft (14) is mounted for rotation by an external drive. The rotary shaft is coupled to a punch (33) such that the rotary movement is converted to a reciprocal movement of the punch. The punch is guided in a die (27) with the punch and die having co-operating cutting edges. The die (27) has a circular sectioned shank (28) located as a good sliding fit in the body (12) and retained by a screw (30) projecting into a recess (29) in the shank (28). When the screw (30) is released the die can be rotated to change the cutting direction or removed and replaced without opening up the body or taking out other parts. With the die removed the punch can be removed easily. The punch is guided both at its upper end in a bore (25) in handle (23) and at its lower end by its head (38) located in a bore in a lower die portion (53) connected to the main die portion (28) by a web (55). The corners (55A) connecting the web with the main die portion and/or lower die portion are radiused or chamfered.</p> |
