| 摘要 |
<p>An arrangement, preferably for clamping knife blades in power shears includes a longitudinal T-slot or dove-tail slot in the blade holder or the blade itself. Gripping means (16, 46, 76) are provided in the slot for engaging retainers (19, 47). The retainers or gripping means are connected to biassing means whereby the blade is pressed against the holder. The biassing means comprise spring means (28) or hydraulic clamping cylinders (36, 38; 61, 62). For relieving the bias of the spring means (28) there are provided hydraulic cylinders (22, 23; 51, 52), which release the blade when they are in operation. Alternatively the bias of the hydraulic clamping cylinders is relieved by counteracting spring means (43; 66) to release engagement of the gripping means. Since the blade is retained by means of retainers engaging in a groove, it can be withdrawn sideways, which enables rapid exchange. The hydraulic operation for clamping and release of the blade, respectively, is very rapid.</p> |
