Print hammer mechanism and pressure control means in high speed printers

Claim 1

IN A PRINTER APPARATUS HAVING MOVING TYPE, A PRINT HAMMER MECHANISM FOR STRIKING A PRINT MEDIUM AGAINST SAID TYPE COMPRISING IN COMBINATION (A) A PIVOTED HAMMER ELEMENT OPERABLE FOR STRIKING SAID TYPE, (B) AN ELECTROMAGNETIC OPERATOR COMPRISING A MAGNETIC CORE MEMBER AND ARMATURE PIVOTALLY MOUNTED THEREON, (C) SAID ARMATURE BEING MOVABLE IN A LIMITED STROKE BY SAID MAGNETIC CORE WHEN ENERGIZE, (D) MEANS FOR OPERATIVELY CONNECTING SAID PIVOTED HAMMER ELEMENT AND SAID ARMATURE WHEREBY SAID HAMMER ELEMENT IS HURLED INERTIALLY AGAINST SAID TYPE UPON ENERGIZATION OF SAID ELECTROMAGNET OPERATOR COMPRISING (E) A SLENDER COLUMN PUSH ELEMENT (F) A STATIONARY MEMBER SLIDINGLY SUPPORTING SAID PUSH ELEMENT WITH THE ENDS THEREOF POSITIONED FOR ABUTTINGLY ENGAGING SAID ARMATURE AND SAID HAMMER ELEMENT, (G) SAID STATIONARY MEMBER HAVING A GROOVE OPEN AN ONE SIDE FOR RECEIVING SAID CONNECTOR WITH A SLIDABLE FIT THROUGHOUT MOST OF ITS LENGTH AND HAVING A REMOVABLE COVER SECURED THERETO TO ENCLOSE SAID OPEN SIDE FOR PREVENTING LATERAL BENDING OF SAID PUSH ELEMENT UNDER COMPRESSIVE LOADS APPLIED BY SAID HAMMER ELEMENT AND SAID ARMATURE, (H) AND MEANS OPERATIVELY CONNECTED TO SAID HAMMER ELEMENT FOR BIASING SAID HAMMER ELEMENT, SAID COLUMN ELEMENT AND SAID ARMATURE INTO OPERATIVE ENGAGEMENT.