| 摘要 |
<p>The driving device for rapid feed and working feed, particularly for driving stamping machines, comprises a working cylinder (2) with a piston (15) hydraulically operated and a gearing down cylinder (1) with a plunger (10) pneumatically operated and a chamber filled with oil receiving said plunger (10). To decrease the length of the cylinder-piston unit, the chamber (13) is connected to the working cylinder (2) by means of an angled pipe. Both cylinders (1, 2) may be at any distance and angular orientation with respect to the direction of the piston motion and may be assembled in a single frame or may form separate units connected by rigid conduits of flexible tubes (28). A plurality of synchronous working cylinders (29) are associated with a common reducing cylinder (24). The total stroke of the working piston (15) may be adjusted by means of a second piston rod (17) which traverses the back wall of the working cylinder (2) and which is provided with an adjustable stop (18). An additional resilient stop (23) allows the selection of the position wherein the working piston (15) switches from the rapid feed to the working feed. </p> |
