| 摘要 |
A machine for marking skins or other articles in sheet form by perforation, comprising:a support structure for m rows each formed from n vertical punches, m and n being whole numbers with m>=1 and n>=2, the upper ends of the punches being inserted into holes of a corresponding plate elastically supported on the support structure, each lower end of the vertical punches of each row interacting with a corresponding wedge element of a plurality of n.m wedge elements, each wedge element being operable by an axial movement of a corresponding operating bar to position the punches between two end positions in which the punches remain fixed, in one of which a cutting edge of the punches is substantially at the level of an upper surface of the plate and in the other of which said cutting edge of the punches lies inside the hole, the distance between the two end positions of the cutting edge corresponding with the thickness of said operating bars for the wedges,mechanism to move the bars;a counterplate facing the plate and movable vertically towards and away from the plate to cause this latter to descend together with a skin retained between them towards the punches and obtain perforation by only those punches which have their cutting edge at the level of the upper surface of the plate and which have been positioned in an arrangement corresponding to an alphanumeric character in accordance with a predetermined code. |
