| 摘要 |
<p>The disclosure is directed to a self-centering feed apparatus (23) for a dual head abrasive grinding machine (11). The grinding heads (17, 18) are mounted in opposed vertical relation, and workpieces are fed therebetween along a horizontal center line or plane. The self-centering feed apparatus (23) comprises at least two sets (41, 43) of control arm mechanisms (45) mounted above and below the center line. The control arm mechanisms (45) of each set are mounted in side-by-side relation on a common pivot shaft (47, 50), and are independently movable toward and away from the center line as the workpieces move through. Each mechanism (45) includes a drive wheel (75) for engaging the workpiece and driving it through the machine. Each control arm mechanism (45) is urged toward the center line by a spring loaded pneumatic actuator (77) that provides a constant gripping force, and which also generates a resistive force that increases as a function of deflection of a control arm mechanism (45) from the center line. This causes the workpieces to self-center on the center line and insures that they will be uniformly surfaced on both sides even in the presence of warpage or variations in thickness.</p> |
