Headpiece for machine tools that produce multiple holes

Details Headpiece for machine tools that produce multiple holes Headpiece for machine tools that produce multiple holes

1999-12-22

2001-10-09

Tsai, Henry (Department: 3722)

Cutting by use of rotating axially moving tool

With product handling or receiving means

C408S057000, C408S059000, C409S131000

Reexamination Certificate

active

06299390

ABSTRACT:

FIELD OF THE INVENTION
This invention pertains to the field of machine tools and, more specifically, to the part of that field that deals with machines that make multiple perforations at high speed, creating multiple holes on flat boards such as, for example, those that act as mechanical supports and insulators for conductors on printed circuit boards.
These machines must necessarily be equipped with one or more headpieces, i.e., one or more devices that keep the board to be drilled stationary by causing it to adhere, in a perfectly flat manner, to a support and reference table. The invention pertains to a headpiece of the above-described type, but with innovative characteristics that make it possible to achieve the extremely advantageous effect of appropriately increasing the machine's efficiency, which depends to a substantial extent on the number of perforations that can be produced in a reference unit of time.
BACKGROUND OF THE INVENTION
Today's headpieces, which are equipped with a pneumatic system for sucking up the shavings that are produced during machining, move continuously, pressing from time to time on the area of the board to be machined where a hole is to be made.
The total amount of time that it takes to make a single hole therefore consists of the time that it takes the headpiece to reach the board starting from an initial standby position and the time it takes the headpiece to retract. The time required for the drilling per se therefore lies within this interval and is shorter than the latter, since the tip rests on the board to be drilled only after the headpiece has finished being compressed against an elastic packing with which it is equipped; this packing has to be used in order to avoid damaging the board itself and to ensure that uniform pressure is exerted on said board over the entire contact surface.
The two lengths of time, elastic compression and elastic reexpansion of said packing, are therefore dead times that are added to the time that the drilling work itself takes.
In the more common case mentioned above, where machining is done on printed circuit boards, the work of drilling, which involves advancing a few millimeters in a fairly friable material, lasts an extremely short time for each individual hole, and therefore the dead times involving the actual actuation of the headpiece increase substantially in terms of percentage.
SUMMARY OF THE INVENTION
The inventor of this invention has developed the idea of a headpiece which, although it performs the actual functions that need to be performed and that were described above, does not involve any dead time that is added to that of the actual work of sucking up shavings.
As a matter of fact, a headpiece that is produced according to the invention actually adheres to the entire area of the board where the holes are to be made and therefore does not need to be moved in a cyclic fashion per se to help with drilling that is done in succession in space and time.
A preferred embodiment of a headpiece according to the invention will now be described, whereby, however, this example is neither limiting nor binding with respect to the other embodiments that can be produced by implementing the teachings a contained herein.


REFERENCES:
patent: 4909293 (1990-03-01), Maioli
patent: 4921375 (1990-05-01), Famulari
patent: 4986703 (1991-01-01), Hampl et al.
patent: 5356245 (1994-10-01), Hosoi et al.
patent: 6079078 (2000-06-01), Byington

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