| 摘要 |
<p>PNEUMATIC FEEDER FOR PUNCH PRESSES A pneumatically operated stock feeder for intermittently advancing stock into the work station of a punch press or the like and having an improved pneumatic control arrangement which incorporates three interconnected valves, namely a main three-way valve, an inlet pressure responsive valve means and a fluid pressure controlled exhaust valve means, for controlling the proper sequencing of the fluid motors that respectively produce the stock gripping, clamping and feeding actions of the feeder. The combination of the two pressure responsive sequence valve means control the operation of the main feed motor and are in turn controlled by the output of the main control valve; this control arrangement affording a high. level of feed accuracy yet tolerating a relatively wide range of operator set-up inaccuracies and speed changes without significantly adversely affecting such feed accuracy.</p> |
