| 主权项 |
1. A locking apparatus useful in a machine having multiple stems which axially reciprocate with respect to a stationary unit, the stems being caused to axially reciprocate in unison by linkage with a reciprocating common plate, the locking apparatus comprising:
(a) a first locking assembly capable of alternatively assuming (i) a first locking assembly engaged position wherein at least one of the reciprocating stems is affixed to the common plate, and (ii) a first locking assembly non-engaged position wherein the at least one reciprocating stem is not affixed to the common plate; and (b) a second locking assembly is capable of alternatively assuming (i) a second locking assembly engaged position wherein the at least one reciprocating stem is affixed to the stationary unit, and (ii) a second locking assembly non-engaged position wherein the at least one reciprocating stem is not affixed to the stationary unit; wherein the first locking assembly, the second locking assembly and the at least one reciprocating stem are configured so that, when the first locking assembly is placed in the first locking assembly engaged position, the second locking assembly is automatically placed in the second locking assembly non-engaged position and, when the first locking assembly is placed in the first locking assembly non-engaged position, the second locking assembly is automatically placed in the second locking assembly engaged position. |
