Classifying – separating – and assorting solids – Sorting special items – and certain methods and apparatus for... – Signalling – indicating – or display means
Patent
1987-05-15
1989-01-03
Reeves, Robert B.
Classifying, separating, and assorting solids
Sorting special items, and certain methods and apparatus for...
Signalling, indicating, or display means
209549, 209573, 209598, 209604, 209703, 209707, 209940, B07C 500, B07C 534
Patent
active
047955546
ABSTRACT:
There is provided, a method and apparatus for determining if the lengths of all of the leads on all four sides of a PLCC packaged devices are within a selected tolerance of each other. To do so a relatively smooth surface across which the device is to be advanced is provided with that surface having a plurality of fingers affixed thereto. Each finger protrudes from the surface by an amount equivalent to the selected tolerance, with the plurality of fingers being in number at least equivalent to the number of leads on the longest side of the device to be tested. In addition, the surface is supported at a selected angle to horizontal. As the device is advanced across the surface in the direction of, and across the space spanned by, the fingers, the devices having all of its leads within the selected tolerance are differentiated from those devices that do not have all of their leads within the selected tolerance. Those devices which have all of its leads on its first two sides within the selected tolerance are rotatated and the second two sides are tested in the same manner as were the first two sides.
REFERENCES:
patent: 2321191 (1943-06-01), Elmendorf
patent: 2328854 (1943-09-01), Shuman
patent: 2549296 (1951-04-01), Dilts
patent: 2554982 (1951-05-01), Hartley et al.
patent: 2671139 (1954-03-01), Dilts
patent: 4090610 (1978-05-01), Luginbuhl
patent: 4138018 (1979-02-01), Daebler et al.
patent: 4161251 (1979-07-01), Paul
IBM Technical Disclosure Bulletin, "Pin Detect and Reject", vol. 14, No. 2, Jul. 1971, p. 424.
Jones Allston L.
Reeves Robert B.
Wacyra Edward M.
LandOfFree
PLCC co-planarity measurement method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with PLCC co-planarity measurement method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and PLCC co-planarity measurement method and apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2166910