Cutting by use of rotating axially moving tool – With means to regulate operation by use of templet – tape,...
Reexamination Certificate
1999-05-26
2001-05-15
Bishop, Steve C. (Department: 3722)
Cutting by use of rotating axially moving tool
With means to regulate operation by use of templet, tape,...
C408S042000, C408S043000, C408S046000
Reexamination Certificate
active
06231279
ABSTRACT:
The present invention relates to a drilling machine with at least two machining heads for machining printed circuit boards.
BACKGROUND OF THE INVENTION
For machining printed circuit boards, there is an increasing demand for highly flexible, high-precision, high-output machines. For which purpose, drilling machines have been devised comprising a number of machining heads for simultaneously drilling a corresponding number of identical boards. Nevertheless, despite the high output achieved, the degree of flexibility of such machines is invariably poor.
A drilling machine is also known comprising a table movable along the usual Y axis and which may be loaded with a number of boards, even of different sizes; and a number of machining heads movable independently of one another along the usual X axis so as to machine boards of different sizes and/or different hole patterns.
The above machine has several drawbacks. In particular, setting the Y-axis position of the heads on the respective carriages is extremely complicated. Moreover, since the holes in the circuits are normally arranged in a matrix of rows and columns, the various heads can only operate simultaneously at locations along the same rows of the respective circuit boards, i.e. at locations having the same Y-axis coordinate. If any of the boards do not require drilling along a given row, the respective heads must remain idle until all the holes in that particular row have been drilled by the other heads, thus limiting the output of the machine as a whole.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a highly straightforward, highly flexible drilling machine designed to eliminate the aforementioned drawbacks of known drilling machines.
According to the present invention, there is provided a drilling machine having at least two machining heads for machining printed circuit boards, and comprising a work table movable along a base in a first direction; a cross member fitted to said base; and at least two carriages supporting said two machining heads and sliding along said cross member in a second direction perpendicular to said first direction; characterized in that at least one of said two machining heads is movable, with respect to the corresponding carriage and in said first direction, by actuating means.
REFERENCES:
patent: 5075530 (1991-12-01), Lee
patent: 5230685 (1993-07-01), Christen et al.
patent: 5265986 (1993-11-01), Prokopp
patent: 5584788 (1996-12-01), Piovano
patent: 5882286 (1999-03-01), Aufiero
patent: 6099449 (2000-08-01), Geiger
patent: 0652693 A1 (1995-05-01), None
patent: 0891126 (1999-01-01), None
Bishop Steve C.
Pluritec Italia S.p.A.
Sheridan & Ross P.C.
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