Apparatus for effecting engagement of a tool with a work piece during each work stroke and for automatically disengaging the tool during each return stroke

Claim 1

APPARATUS FOR AUTOMATICALLY EFFECTING ENGAGEMENT OF A TOOL WITH A WORK PIECE DURING EACH WORK STROKE OF A MACHINE AND FOR AUTOMATICALLY DISENGAGING THE TOOL FROM THE WORK PIECE DURING EACH RETURN STROKE OF THE MACHINE, COMPRISING: (A) A TOOL HOLDER HAVING A FIRST MEMBER ADAPTED TO BE ATTACHED TO A SUPPORT FOR RECIPROCAL MOVEMENT THEREON, ONE DIRECTION OF SAID MOVEMENT COMPRISING THE WORK STROKE AND THE OTHER DIRECTION OF SAID MOVEMENT COMPRISING THE RETURN STROKE, AND HAVING A SECOND MEMBER PIVOTALLY ATTACHED TO SAID FIRST MEMBER, SAID SECOND MEMBER ADAPTED TO HOLD A TOOL AND HAVING A FIRST PIVOTAL RELATIVE POSITION WITH RESPECT TO SAID FIRST MEMBER FOR ENGAGING SAID TOOL WITH A WORK PIECE DURING SAID WORK STROKE AND HAVING A SECOND PIVOTAL RELATIVE POSITION WITH RESPECT TO SAID FIRST MEMBER FOR DISENGAGING SAID TOOL FROM SAID WORK PIECE DURING SAID RETURN STROKE, (B) FLUID PRESSURE RESPONSIVE MEANS CARRIED BY SAID TOOL HOLDER AND OPERABLE IN A FIRST MODE TO MOVE SAID SECOND MEMBER TO ITS FIRST POSITION AND OPERABLE IN A SECOND MODE TO MOVE SAID MEMBER TO ITS SECOND POSITION, AND (C) FLUID PRESSURE CONTROL MEANS CARRIED BY SAID TOOL HOLDER AND OPERABLE IN RESPONSE TO TERMINATION OF THE RETURN STROKE TO CONTROL SUPPLY OF FLUID PRESSURE TO OPERATE SAID PRESSURE RESPONSIVE MEANS IN ITS FIRST MODE AND OPERABLE IN RESPONSE TO TERMINATION OF THE WORK STROKE TO OPERATE SAID FLUID PRESSURE RESPONSIVE MEANS IN ITS SECOND MODE.