Patent ID: 7216421

Claim:
A stamping machine adapted for mounting a retention frame of a heat sink to a motherboard, the stamping machine comprising: a machine body comprising: a support plane, a plurality of adjustable positioning blocks provided on the support plane adapted to fittingly position the motherboard; a stamping arm extending upwardly from the support plane, a stamping assembly positioned at a forepart of the stamping arm comprising a cylinder, a stamping block moveably connected to the cylinder, and a base portion attached on the support plane corresponding to the stamping block, a plurality of stamping posts extending from the stamping block, a plurality of retractable pressing pins depending from the stamping block, a resilient member disposed around each of the pressing pins; and a control unit controlling stamping of the stamping block, wherein the control unit comprises an Alternating Current (AC) loop and a Direct Current (DC) loop system, the AC loop comprises a power supply switch and a first relay connected in series to an AC power source, the DC loop system comprises a protecting loop, a start-up loop having two touch switches connected in series to be simultaneously pressed to start up the cylinder, an overtime loop having an overtime relay, and a control loop comprising an overtime relay switch controlled by the overtime relay, and an electromagnetic valve connected in series to the overtime relay switch to control the cylinder, and wherein the four loops of the DC loop system are connected in parallel to a DC power source via a relay switch which is controlled by the first relay of the AC loop.