Operation control mechanism for accounting machines

Claim 1

A CONTROL MECHANISM FOR A CALCULATING MACHINE HAVING A PLURALITY OF COLUMNS OF AMOUNT ENTERING KEYS COMPRISING IN COMBINATION: A POWER SECTION; A CONTROL KEY OPERATIVE UPON DEPRESSION TO ENERGIZE SAID POWER SECTION; A DRIVESHAFT OPERATIVE UPON ROTATION TO CAUSE A MACHINE CYCLE; A CLUTCH MEMBER HAVING A FIRST POSITION FOR CONNECTING SAID SECTION TO SAID SHAFT AND A SECOND POSITION FOR DISCONNECTING SAID SECTION FROM SAID SHAFT; MEANS URGING SAID MEMBER TOWARD ITS FIRST POSITION; A FIRST CLUTCH CONTROL SLIDE HAVING FIRST AND SECOND POSITIONS; MEANS CONTROLLED BY SELECTED ONES OF SAID AMOUNT OF KEYS TO HOLD SAID SLIDE IN ITS FIRST POSITION DURING ROTATION OF SAID SHAFT; A FIRST SENSING SLIDE DISPOSED BENEATH SAID CONTROL KEY AND HAVING FIRST AND SECOND POSITIONS; MEANS HOLDING SAID SENSING SLIDE IN ITS FIRST POSITION IN RESPONSE TO OPERATION OF SAID CONTROL KEY; POWER-DRIVEN MEANS OPERATIVE TO URGE SAID SENSING SLIDE TOWARD ITS SECOND POSITION AND TO URGE SAID CONTROL SLIDE TOWARD ITS SECOND POSITION IN RESPONSE TO SAID SENSING SLIDE BEING HELD IN ITS FIRST POSITION; AND MEANS OPERATIVE TO POSITION SAID CLUTCH MEMBER IN ITS SECONE POSITION IN RESPONSE TO MOVEMENT OF SAID CONTROL SLIDE TO ITS SECOND POSITION.