Pressure foot of printed circuit board drilling apparatus

Details Pressure foot of printed circuit board drilling apparatus Pressure foot of printed circuit board drilling apparatus

1988-12-22

1990-04-10

Bishop, Steven C.

Cutting by use of rotating axially moving tool

With means to apply transient, fluent medium to work or product

408 61, 408 67, 408 95, 409136, 409137, B23B 4734, B23Q 1102, B23Q 1110

Patent

active

049155504

ABSTRACT:
In a pressure foot used in an apparatus for drilling printed circuit boards, which includes a bearing for holding a spindle, and formed at the end portion thereof with an inner void space having a bottom hole for passing the drill bit, the end portion of the pressure foot is provided with an annular end surface possibly contacting with the printed circuit board and air injection ports for injecting compressed air into the inner space. The air injection ports are so directed that the air flow from each injection port is tangently contacts with the circumferential surface of the drill.

REFERENCES:
patent: 4011792 (1977-03-01), Davis
patent: 4037982 (1977-07-01), Clement
patent: 4340326 (1982-07-01), Buonauro et al.

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