| 摘要 |
<p>A pneumatically operated driving device (10) is constructed and arranged to operate in a single actuation sequence and an automatic actuation sequence. The device includes a control valve assembly (28) for communicating reservoir pressure to move a piston (24) in a direction to effect a drive stroke of a fastener driving element (26) and for permitting the piston (24) to move in a direction to effect the return stroke of the fastener driving element (26). The control valve assembly (28) includes a main valve (34), a secondary valve (60), and first and second actuating members (80,88) for controlling movement of the main and secondary valves. A trigger member (30) moves the actuating members (80,88). A trigger member adjustment structure (100) provides adjustment of pivotal movement of the trigger member (30), thereby providing operator selection of single actuation followed by automatic actuation of the device, or automatic actuation thereof only. <IMAGE></p> |
