| 摘要 |
<p>A hydrostatic drive for reciprocating the transfer bar of a multi-station transfer mechanism wherein the motive power is supplied by a swashplate type pump, the control arm of which is pivoted to accelerate and decelerate the transfer bar by means of a yoke connected to the end of the control arm and adapted to be displaced by a control cylinder supplied with pressure fluid from an auxiliary pump through a four-way solenoid operated, spring centered valve. When the valve is in the centered position the yoke is spring biased toward a centered position, thus shifting the control arm of the swashplate pump to the neutral position so that the transfer bar can at any point between the ends of its stroke be stopped with a controlled rate of deceleration and again started with a controlled rate of acceleration.</p> |
