Smart indexing head for universal lead frame work station
First Claim
1. Apparatus for positioning individual lead frame bonding sites in the bonding window of a work station prior to a bonding operation, comprising:
- a work holder base,a Y-table mounted on said work holder base for movement relative thereto,Y-drive means for moving said Y-table in a Y direction,indexing head means comprising X-motor means mounted on said Y-table for movement relative thereto,said X-motor means comprising an elongated rail means and an X-motor mounted thereon for movement relative thereto,said indexing head means further comprising a gripper mechanism mounted on said X-motor means for movement therewith,said gripper mechanism comprising a support arm having an upper jaw arm and a lower jar arm pivoted thereon,upper and lower jaw arm pivot means mounted on said upper and lower jaw arms respectively for gripping a lead frame in a manner which leaves a lead frame edge exposed,theta reference means movably mounted on said gripper mechanism for movement perpendicular to the direction of movement of said X-motor and for engaging said exposed edge of said lead frame and for mechanically orienting an individual bonding site on said lead frame in a theta orientation prior to positioning said oriented bonding site in said window of said work station.
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Accused Products
Abstract
Apparatus and a method for orienting individual bonding sites of a lead frame having a plurality of bonding sites includes a universal work station in a work holder. The work holder comprises a gripper mechanism which is mounted on a transverse rail or bar for grasping a lead frame at an edge portion thereof while exposed in a supply magazine. The jaws of the gripper mechanism are pivoted in a horizontal direction which permits the exposed edge of the lead frame to be aligned parallel to a reference plane in a theta orientation direction. While oriented in the theta orientation direction, the lead frame is moved precisely to the window of the work station of the work holder where it is clamped by the top plate and lower plate of the work station before being subsequently bonded. A modified feature of the invention permits the mechanically theta oriented bonding site to be viewed by a PRS system and reoriented in an X and Y position prior to being clamped in the work station to provide a very high degree of theta, X and Y location of individual bonding sites in the window of a work station prior to bonding.
96 Citations
15 Claims
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1. Apparatus for positioning individual lead frame bonding sites in the bonding window of a work station prior to a bonding operation, comprising:
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a work holder base, a Y-table mounted on said work holder base for movement relative thereto, Y-drive means for moving said Y-table in a Y direction, indexing head means comprising X-motor means mounted on said Y-table for movement relative thereto, said X-motor means comprising an elongated rail means and an X-motor mounted thereon for movement relative thereto, said indexing head means further comprising a gripper mechanism mounted on said X-motor means for movement therewith, said gripper mechanism comprising a support arm having an upper jaw arm and a lower jar arm pivoted thereon, upper and lower jaw arm pivot means mounted on said upper and lower jaw arms respectively for gripping a lead frame in a manner which leaves a lead frame edge exposed, theta reference means movably mounted on said gripper mechanism for movement perpendicular to the direction of movement of said X-motor and for engaging said exposed edge of said lead frame and for mechanically orienting an individual bonding site on said lead frame in a theta orientation prior to positioning said oriented bonding site in said window of said work station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification