Assembly and method for IC unit engagement
AssigneeRokko Systems Pte Ltd
InventorsHae Choon Yang, Jong Jae Jung, Deok Chun Jang, Chong Chen Gary Lim
Life of this patent
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Abstract
A picker assembly includes a plurality of pickers in selective variable spaced relation, a shaft having a plurality of cam plates, the cam plates co-axial with said shaft and having a variable thickness. The cam plates are in engagement with the pickers and positioned in interstitial spaces between the pickers. The selective variability in spacing is provided by rotation of the shaft such that thickness variation of the cam plates move the respective pickers along an axis parallel to the shaft.
Claims19
A picker assembly comprising
- a plurality of pickers in selective variable spaced relation;
- a shaft having a plurality of cam plates, said cam plates co-axial with said shaft and having a variable thickness;
- said cam plates in engagement with said pickers and positioned in interstitial spaces between said pickers;
- wherein the selective variability in spacing is provided by rotation of the shaft such that thickness variation of the cam plates move the respective pickers along an axis parallel to the shaft;
- and
- wherein said cam plates are placed so as to be engaged with adjacent pickers, said cam plates arranged on the shaft such that the thickness of each of said cam plates is the same at each point around the circumference of each plate.
A method for picker assembly for selectively varying the spacing of pickers within a picker assembly, the method comprising the steps of:
- rotating a shaft having a plurality of co-axial cam plates, said earn having a variable thickness, said cam plates in engagement with said pickers;
- biasing said pickers using said earn plates, and consequently;
- wherein the selective variability in spacing is provided by rotation of the shaft moving the respective pickers along an axis parallel to the shaft so as to vary the respective picker spacing;
- and
- wherein said cam plates are placed so as to be engaged with adjacent pickers, said cam plates arranged on the shaft such that the thickness of each of said cam plates is the same at each point around the circumference of each plate.
A method for picker assembly for selectively varying the spacing of pickers within a picker assembly, the method comprising the steps of:
- providing a plurality of pairs of pickers, with each picker positioned symmetrically about a centerline, said pairs placed sequentially from an innermost pair closest to the centerline to an outermost pair, furthest from the centerline;
- simultaneously moving a plurality of belts, each belt having a pair of said pickers mounted thereto;
- diverging or converging corresponding pickers within each pair as a result of moving said belts, and consequently;
- selectively varying the spacing of said pickers.
A picker assembly comprising:
- a plurality of pairs of pickers, with each picker positioned symmetrically about a centerline, said pairs placed sequentially from an innermost pair closest to the centerline to an outermost pair, furthest from the centerline;
- a plurality of belts, each belt having a pair of said pickers mounted thereto;
- each of said belts arranged in a loop about a pair of pulleys, with one picker on an upper part of the loop and corresponding other picker on a bottom portion, such that movement of the belt diverges or converges corresponding pickers within each pair;
- each belt in communication with a fixed ratio gearbox, with said gearboxes mounted on a common shaft;
- wherein the gear ration of each gearbox is a function of the position of the corresponding pair of pickers, said ration corresponding to the number of interstitial spaces between corresponding pickers within each pair.
A picker assembly for engaging singulated IC units, the assembly comprising
- a plurality of unit picker pairs, each unit picker within said pair having an engagement end for engagement of an IC unit;
- each of said unit pickers movably mounted to permit movement from a retracted position to a unit engagement position;
- a plurality of curvilinear drive members having arcuate portions at opposed ends, each drive member corresponding to each of said unit picker pairs
- each of said unit picker within said corresponding pair arranged to contact the drive member at the arcuate portion of said drive member;
- wherein each of said drive members being rotatable about a horizontal axis intermediate said opposed ends such that rotation of the drive member in a first direction forces one of said unit pickers downward and a rotation in a second direction drives the other unit picker downwards.
Dependencies are inferred from the claim text.