| 主权项 |
1. A paper punch comprising:
a base having a guiding hole elongated in a longitudinal direction; an elongated slide board disposed on said base and rearwardly of said guiding hole and extending in the longitudinal direction, said slide board having a front positioning surface and a rear positioning surface extending in the longitudinal direction and disposed proximate to and distal from said guiding hole, respectively; a press board pivotably connected to said base at a pivot end thereof and extending rearwardly to terminate at an effort end, said press board having a press portion interposed between said pivot end and said effort end and extending downwardly; a plurality of punch seats, each having a die holder movably disposed on said base in the longitudinal direction, a punch head disposed on and movable relative to said die holder in an upright direction, a force transmitting member disposed between said press portion and said punch head to transmit a pressing force generated as a result of turning of said press board so as to press said punch head downwardly, and a biasing member disposed to bias said punch head upwardly, said die holder having a housing for said punch head to be movably accommodated therein, an extending arm extending rearwardly from said housing and defining therein a receiving space, and an anchoring portion extending downwardly from said housing and slidably engaged with said guiding hole, said housing having a rear abutting surface facing said front positioning surface of said slide board, said extending arm having a lower arm portion configured to cooperate with said housing to define an opening for insertion of said slide board, said housing having front and rear barrier portions spaced apart from each other to define a guiding channel therebetween, said force transmitting member having a thrust wall disposed above said punch head to be thrust by the pressing force, a connecting leg extending downwardly from said thrust wall and slidably disposed in said guiding channel, and a fastener disposed to fasten said connecting leg to said punch head so as to move said punch head downwardly along with a sliding movement of said force transmitting member along said guiding channel, said thrust wall having a cross-section larger than that of said punch head; and a plurality of control members, each disposed on said die holder, each of said control members having a pivot pin disposed in said receiving space of said extending arm, and an eccentric seat eccentrically journalled on said pivot pin, said eccentric seat having an outer contour including first and second faces which are angularly displaced from each other about said pivot pin and which are proximate to and distal from said pivot pin, respectively, such that said eccentric seat is turnable relative to said extending arm between a locked position, where said first face is abutted tightly against said rear positioning surface of said slide board to generate a thrust force that permits said rear abutting surface to abut tightly against said front positioning surface of said slide board, and an unlocked position, where said second face confronts said rear positioning surface to permit movement of said die holder relative to said base in the longitudinal direction. |
