| 摘要 |
A punch device for punching parallel slots in sheets so that card-like objects can be mounted on sheet. The device comprises a male plate on which at least one pair of projections are mounted, each member of the pair diagonally placed on the male plate, and separated from each other by a distance slightly smaller than the diagonal of the card-like object to be mounted. The device also comprises a female plate moveably hinged to the male plate by means of a hinge assembly, through which rectangular slots are formed each slot being so positioned as to correspondingly face one of said cutting projections in the male plate when the punch device is closed thereby ensuring that the projections penetrate the slots. The punch device also includes a hinge assembly comprising an axle part and a swivel part. The axle part comprises cams and the swivel part comprises grooves. The cams are positioned to penetrate the grooves and wrap around over an angle less than the whole circumference of axle part, thereby engaging grooves over a range of angular opening of punch device ranging from approximately 0 to 270 degrees, therefore ensuring that axle part and swivel part do not slip with respect to each other. In addition the cams do not engage the groove over angular opening greater than approximately 270 degrees, thereby permitting the easy assembly or disassembly of punch device.
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