Apparatus for automatic separation along predetermined bending fracture lines in basic ceramic platelets of hybrid electronic circuits

• US 5,069,195 A
• Filed: 06/13/1989
• Issued: 12/03/1991
• Est. Priority Date: 06/16/1988
• Status: Expired due to Fees

• Current Assignee: AISA SPA
• Original Assignee: AISA SPA
• Inventors: Barozzi, Gian P.
• Primary Examiner(s): Yost, Frank T.
• Assistant Examiner(s): Rada, Rinaldi
• Application Number:
  US07/365,458
• Time in Patent Office: 903 Days
• Field of Search: 225/96.5, 225/97, 225/103, 225/2, 125/23 R, 125/35, 125/23.01, 125/23.02
• US Class Current: 125/23.01
• CPC Class Codes: B28D 5/0023 rectilinearly
• CPC Class Codes: B28D 5/0052 Means for supporting or holding work during breaking means for conveying work to or discharging work from the breaking machine B28D5/0058
• CPC Class Codes: H05K 1/0306 Inorganic insulating substrates, e.g. ceramic, glass
• CPC Class Codes: H05K 2201/0909 Preformed cutting or breaking line
• CPC Class Codes: H05K 2203/302 Bending a rigid substrate; Breaking rigid substrates by bending
• CPC Class Codes: H05K 3/0052 Depaneling, i.e. dividing a panel into circuit boards; Working of the edges of circuit boards
• CPC Class Codes: Y10T 225/325 With means to apply moment of force to weakened work
• CPC Class Codes: Y10T 225/329 Plural breakers
• CPC Class Codes: Y10T 225/371 Movable breaking tool

Abstract

An apparatus for the automatic separation along predetermined bending fracture lines in basic ceramic platelets of hybrid electronic circuits includes a support plate provided with grooves on its lower face defining bending lines juxtaposed with the fracture lines of the platelet urged against an upper face of plate by upper pressing members being in contact with each of single elements of the platelet defined by the fracture lines and lower retractable members controlled in a predetermined sequence for successive bending of the plate and the platelet subdivided in a plurality of single elements.

Claims

1. An apparatus for automatically subdividing a basic ceramic platelet of hybrid electronic circuits into a plurality of single elements along a plurality of predetermined bending-fracture lines of said platelet, said apparatus comprising:

a support plate having a lower face and an upper face spaced from said lower face and parallel thereto, said upper face being juxtaposed with the ceramic platelet, said lower face being provided with;

a plurality of intersecting grooves open at and traversing said lower face, said grooves extending upwardly toward said upper face but terminating at a distance therefrom, said grooves forming boundaries defining a plurality of bays of said plate therebetween and defining bending lines connecting said bays and being in registry with the fracture lines of the platelet, said bays being rigid upon a successive bending of said support plate along said bending lines;

means juxtaposed with said upper face of the plate for pressing each of the plurality of single elements to be separated against the respective bay of said plate;

a fixed support juxtaposed with said lower face of the plate and being in a continuous contact with one of said bays;

a plurality of retractable members facing said lower face of the plate and acting against others of said bays; and

means for controlling the retraction of said retractable members in a predetermined sequence upon the successive bending of said plate and the platelet by said means for pressing along said bending lines, so that the ceramic platelet is subdivided in the plurality of single elements along the fracture lines of the platelet.

2. The apparatus defined in claim 1 wherein said upper face of said support plate is provided with a plurality of notches juxtaposed with said grooves and extending along said bending lines of said plate, each of said notches and the respective groove defining a respective diaphragm therebetween in said plate.

3. The apparatus defined in claim 1 wherein said support plate is a thick plastic plate.

4. The apparatus defined in claim 1, further comprising a frame carrying said means for pressing said platelet, said means for pressing being a plurality of thrust members opposing said retractable members.

5. The apparatus defined in claim 4 wherein said thrust members are movable between a position of engagement thereof with the platelet and a position of disengagement of said thrust members with the platelet.

6. The apparatus defined in claim 4 wherein each of said thrust members comprises an elastic pressure element and a controllable retraction actuator.

7. The apparatus defined in claim 1 wherein said retractable members are disposed according to a fixed grid pattern having a pitch, each of said single elements to be separated having generally a rectangular cross-section and having a minimum dimension thereof, said pitch being at most equal to said minimum dimension of each of the single elements of the platelet.

8. The apparatus defined in claim 1 wherein each of said grooves has an apex located close to said upper face of the plate.

9. The apparatus defined in claim 1, further comprising means for conveying the platelet above said support plate, said means for conveying bein interposed between said plate and the platelet.

10. The apparatus defined in claim 1 wherein said plurality of retractable members include a plurality of shafts rotatable about respective parallel axes of rotation and supporting respective bays, said shafts being provided with respective cam mechanisms formed with at least one lobe carried by the respective shaft, said cams having a predetermined angular relationship therebetween and causing the bending of the bays of said support plate resulting in subdividing the platelet in the plurality of single elements along the fracture lines according to a sequence defined by said means for controlling.

11. The apparatus defined in claim 10 wherein said shafts are actuated by a common motor.

12. The apparatus defined in claim 1 wherein said support plate includes a flexible thin sheet, said bays being rigid and supporting said sheet upon bending of said sheet.