Apparatus for controlling movement of reciprocating member, having data display capable of indicating encoder signal indicative of the movement

An apparatus for controlling a reciprocating movement of a reciprocating member adapted to be reciprocated over a predetermined operating stroke by forward and reverse rotations of a drive motor, said apparatus comprising:

• an encoder for generating at least two pulse signals at least one of which has a pulse interval corresponding to an incremental distance of movement of said reciprocating member;
• an operator's control panel having a plurality of operator's control switches for entering data and commands for controlling said drive motor, and a data display normally operable in a data display mode for displaying information which includes data relating to a movement of said reciprocating member;
• motor control means for controlling said drive motor according to the data entered through said control switches and said at least two pulse signals generated by said encoder;
• detecting means for detecting a specific command generated by at least one of said plurality of control switches;
• and
• display control means responsive to said specific command detected by said detecting means, for placing said data display in an inspection mode for providing an indication as to whether said at least two pulse signals are present or not, respectively.