Patent ID: 8523161

Claim:
A clamping mechanism automatically adaptable to change of thickness of printed circuit board, comprising: a frame body including two horizontal elongated bar-like rail seats in parallel to each other; two clamping rail members respectively mounted on the rail seats for clamping and holding two opposite sides of a printed circuit board, each of the clamping rail members including a first straight elongated clamping rail and a second straight elongated clamping rail, the first and second clamping rails being horizontally mounted on the rail seat along the length thereof in parallel to each other, the second clamping rail being positioned above the first clamping rail, a top rail face of the first clamping rail being spaced from a bottom rail face of the second clamping rail by a certain clamping gap for clamping a corresponding side of the printed circuit board; and two adjustment units respectively disposed on opposite outer sides of the rail seats for adjusting the clamping gap of the clamping rail members, the clamping mechanism being characterized in that each of the adjustment units includes a support section, a connection section and a floating section, the support section being fixedly mounted on the frame body to provide a support face for the floating section, one end of the connection section being fixedly connected with the corresponding first clamping rail, the other end of the connection section being positioned above the support face, the floating section being positioned between the connection section and the support section and supported on the support face to apply a resilient support force to the connection section, via the connection section, the floating section serving to resiliently drive the first clamping rail to float up and down within a certain range and change the height of the first clamping rail, whereby the clamping gap between the first and second clamping rails can be adjusted; wherein each support section has a support wheel positioned under the floating section, a top of the circumference of the support wheel serving as the support face for supporting the floating section.