Title:
BOARD HOLDER IN PRINTED BOARD BORING MACHINE
Document Type and Number:
WIPO Patent Application WO/1991/008073
Kind Code:
A1
Abstract:
This invention relates to a board holder in a printed board boring machine and the holder has the following construction: upper board holders (33, 41, 45, 52, 56) whose tip surfaces project from the contact surface with a printed board (1) towards a table (6) are disposed outside the contact surface in such a manner as to be movable in an axial direction thereof and biasing devices (31, 40, 50, 55) for biasing the upper holder (33, 41, 45, 52, 56) with a force greater than attraction generated in the board holder (18) towards the table (6) are disposed. According to this construction, floating of an upper plate (2) at the time of boring of the printed board (1) can be prevented and boring efficiency can be improved by minimizing a wasteful moving distance of a drill (16).
Inventors:
OTANI TAMIO (JP)
KOGURE KAZUHIRO (JP)
ARAI KUNIO (JP)
KANAYA YASUHIKO (JP)
HAMADA KAZUNORI (JP)
KOGURE KAZUHIRO (JP)
ARAI KUNIO (JP)
KANAYA YASUHIKO (JP)
HAMADA KAZUNORI (JP)
Application Number:
PCT/JP1990/001559
Publication Date:
June 13, 1991
Filing Date:
November 30, 1990
Export Citation:
Assignee:
HITACHI SEIKO KK (JP)
International Classes:
B23B47/28; B23B41/00; B23Q3/06; B23Q11/00; B26F1/16; H05K3/00; (IPC1-7): B23B41/00
Foreign References:
| JPS6211509U | 1987-01-24 | |||
| JPS5111077Y2 | 1976-03-25 | |||
| JPS5578586A | 1980-06-13 |
Other References:
See also references of EP 0455829A4
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