Reciprocating propelling member control

Claim 1

IN A CONVEYOR FOR ARTICLES, SAID CONVEYOR HAVING AN ARTICLE CONVEYING SURFACE AND AN ENDLESS DRIVEN ARTICLE PROPELLING MEMBER, SAID PROPELLING MEMBER HAVING A FORWARD RUN AND A RETURN RUN; A PIVOTALLY MOUNTED SUPPORT ELEMENT FOR SAID FORWARD RUN OF SAID PROPELLING MEMBER, SAID SUPPORT ELEMENT BEING MOVABLE TO SHIFT SAID PROPELLING MEMBER FROM AN ARTICLE PROPELLING POSITION TO AN ARTICLE NON-PROPELLING POSITION; A DRIVEN ACTUATION MEMBER; A BAR ENGAGING SAID ACTUATION MEMBER AND RECIPROCATED THEREBY; A FINGER ON SAID BAR; A SLIDABLE ARM HAVING A FIRST SLOT AND A SECOND SLOT, THE ENDS OF SAID SLOTS OVERLAPPING AND COMMUNICATING THROUGH A COMMON CHANNEL TO FORM A SOMEWHAT Z-SHAPED OPENING RECEIVING SAID FINGER, SAID CHANNEL BEING OF SUCH SIZE THAT SAID FINGER MAY MOVE THERETHROUGH FROM ONE SLOT TO THE OTHER; SAID ARM HAVING MEANS SECURED THERETO WHICH IN ONE POSITION OF SAID ARM PERMITS SAID SUPPORT ELEMENT TO HOLD SAID PROPELLING MEMBER IN ARTICLE PROPELLING POSITION AND IN A SECOND POSITION PIVOTING SAID SUPPORT ELEMENT TO SHIFT SAID PROPELLING MEMBER TO ARTICLE NON-PROPELLING POSITION; CONTROL MEANS FOR SAID ACTUATION MEMBER FOR SHIFTING SAID FINGER THROUGH SAID CHANNEL FROM ONE SLOT TO THE OTHER; SAID FINGER WHEN IN ONE OF SAID SLOTS RECIPROCATING WITHOUT SHIFTING SAID ARM AND WHEN IN THE OTHER OF SAID SLOTS SHIFTING SAID ARM TO ITS OTHER SAID POSITIONS.