Cutting – Means to drive or to guide tool – Magnet- or solenoid-actuated tool
Reexamination Certificate
1999-05-07
2001-10-09
Rachuba, M. (Department: 3724)
Cutting
Means to drive or to guide tool
Magnet- or solenoid-actuated tool
C083S577000, C083S571000, C083S687000, C083S691000
Reexamination Certificate
active
06298761
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a thin film hole making apparatus and, more particularly, to a thin film hole punching die apparatus that is easily assembled and disassembled by means of magnetic coupling forces.
BACKGROUND OF THE INVENTION
In the manufacture of circuit boards and thin film polyimide laminate assemblies, it is often necessary to fabricate small via holes. The vias are used to connect top, bottom and intermediate circuity layers. The present process for creating these small holes requires from eight to ten, one inch square electromagnetic repulsion drive coils that propel a punch through the polyimide material layers. The coils are individually screw fastened to diebars, which provide proper alignment for the holes.
The process is tedious and time consuming. Each job requires different part spacings and frequent maintenance dictated by having to clean each coil.
The present invention features a coil holding block that holds a column of individual coils. The holding block acts as a single unit, and is magnetically attached to a punch diebar. The magnetic attraction between the holding block and die bar provides easy assembly and disassembly of the parts. The magnetic assembly reduces the replacement time for the coils from a previous forty-five minutes to less than one minute.
Milled pockets in a lower portion of the holding block provide proper static punch height. In the previous assembly, such spacing had to be individually aligned by hand under each coil. Thus, the coil block holder of this invention eliminates the requirement for individual spacers, tedious spacer/coil alignment, and the screw unfastening of the coils.
DISCUSSION OF RELATED ART
In European Patent Publication No. 0 608 152 A1, published on Jul. 24, 1994, rotary press cutters are illustrated that are used in the production of envelope blanks, and feature a flexible foil cutting die. An outer portion of a blade of the die is held against an outer periphery of the roller by magnetic attraction.
In U.S. Pat. No. 5,178,051, issued to Smith et al on Jan. 12, 1993 for Magnetic Punch Die Retention for HTCC/LTCC Fabrication, a die punch apparatus is illustrated. The die punch apparatus includes an electromagnetic die head core. Single punches are magnetically held in the die to facilitate changing the punches in a simple retooling process.
In U.S. Pat. No. 5,138,919, issued to Wilhelm on Aug. 18, 1992 for Magnetic Holder for Punch Stripper, a stripper for stripping a punched workpiece from a punch press is illustrated. The stripper has a magnetic holder to retain the stripper on the punch.
In U.S. Pat. No. 4,215,610 issued on Aug. 5, 1980 to Lemmer for Apparatus for Perforating a Foil, a reduced motion system carrying a foil punching device is illustrated. The foil punching device is magnetically held in place.
In U.S. Pat. No. 4,233,873 issued on Nov. 18, 1980 to Jessen for Permanent Magnetic Hold Down for Steel Rule Dies, steel rule dies for cutting patterns are illustrated. Each die is held magnetically to a steel chase during the cutting operation.
In U.S. Pat. No. 4,210,047, issued to Haas et al on Jul. 1, 1980 for Die Cutting Machine with Magnetic Holder for Accurate Die Positioning, a magnetic die holder is illustrated. The die holder is magnetically held and supported upon a die carrying section.
U.S. Pat. No. 3,782,166, issued to Whistler, Jr. et al on Jan. 1, 1974 for Die Set Assembly and Magnet Means for Releasably Attaching Dies Therein, features an assembly containing magnets for releasably attaching dies thereto. A template arrangement is provided for aligning the die set.
In Japanese Publication No.
58-000325
, published on Jan. 5, 1983, a magnetic position device is described which moves a plate of material back and forth and left and right, and a die positioning device that moves a die to and from a work portion via a chain.
SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided an apparatus for fabricating holes in a thin film. A holding block is provided for holding a column of individual electromagnetic driving coils. The holding block acts as a single unit, and is magnetically attached to a punch diebar. The magnetic attraction between the holding block and die bar provides easy assembly and disassembly of the parts. Milled pockets define a first series of apertures that are disposed in a lower portion of the holding block. They provide proper static punch height. The holder also includes means defining a second series of apertures. The second series of apertures carries magnets for attaching the holding block to the punch diebar.
It is an object of this invention to provide an improved hole making device.
It is another object of the invention to provide a hole making apparatus having a coil holding bar that is magnetically assembled and disassembled from a diebar.
REFERENCES:
patent: 3570345 (1971-03-01), Spengler
patent: 3763731 (1973-10-01), Wistedt
patent: 3782166 (1974-01-01), Whistler, Jr. et al.
patent: 4210047 (1980-07-01), Haas et al.
patent: 4215610 (1980-08-01), Lemmer
patent: 4233873 (1980-11-01), Jessen
patent: 4303054 (1981-12-01), Lore
patent: 5138919 (1992-08-01), Wilhelm
patent: 5178051 (1993-01-01), Smith et al.
patent: 0 608 152 A1 (1994-01-01), None
patent: 58-000325 (1983-01-01), None
Houser David E.
Tiberia Candido C.
Veasaw James A.
Fraley Lawrence R.
International Business Machines - Corporation
Rachuba M.
Salzman & Levy
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