Cutting by use of rotating axially moving tool – Processes – Bit detachable
Patent
1990-11-30
1991-06-18
Schwartz, Larry I.
Cutting by use of rotating axially moving tool
Processes
Bit detachable
408 95, 408 56, 408 61, 408 67, B23B 4700
Patent
active
050245627
ABSTRACT:
A pressure foot for a machine for drilling a printed circuit board is supported to be slidable in an axial direction of a rotor shaft and is connected to a vacuum suction source. The pressure foot is adapted to depress the printed circuit board during a drilling operation. A first air pathway is formed from a first supply port formed in a side wall of the pressure foot to a plurality of first blow-out ports formed in a contact surface of the pressure foot with the printed circuit board. The first supply port is connected with a pressure air source. A second air pathway extends from a second supply port formed in the side wall to a plurality of second blow-out ports opened toward an interior of the pressure foot. The second air pathway is in communication with a supply source of a pressure air. Thus, the working time and cost are reduced.
REFERENCES:
patent: 4037982 (1977-07-01), Clement
patent: 4340326 (1982-07-01), Buonauro et al.
patent: 4813825 (1989-03-01), Kosmowshi
patent: 4822219 (1989-04-01), Wood et al.
patent: 4915550 (1990-04-01), Arai et al.
patent: 4917547 (1990-04-01), Frederichson et al.
Japanese Utility Model (unexamined) Publication No. 61-124313.
Arai Kunio
Kanaga Yasuhiko
Hitachi Seiko Ltd.
Schultz Robert
Schwartz Larry I.
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