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785results about "Stencilling apparatus" patented technology

System and methods for data-driven control of manufacturing processes

Systems and methods for implementing hybrid, closed-loop control that generates control values for processes defined by a limited number of function evaluations and large amounts of process and measurement noise. The described control system is applied to a stencil printing process for applying solder paste to an electronic medium such as a printed circuit board or semiconductor wafer. The control system is defined by a hybrid approach. A first, coarse algorithm is used to rapidly produce the value of a stencil printer control value resulting in a solder paste deposit having a volume within predetermined acceptable limits. After the coarse algorithm no longer produces solder paste deposits closer to a desired volume, a second, more refined estimator is used to fine tune the process. An additional transitional algorithm may be added between the coarse algorithm and refined estimator. The coarse algorithm may be implemented with a constrained-conjugated gradient search, and the refined search may be a implemented using a least-squares affine estimator or a quadratic estimator. The transitional algorithm may be implemented using a block version of a least-squares affine estimator.
Owner:GEORGIA TECH RES CORP

Combination stencil printer and dispenser and related methods

A combination stencil printer and dispenser includes a frame, a movable stencil coupled to the frame, a substrate support coupled to the frame to support a substrate in a print position, and a print head coupled to the frame to deposit and print viscous material over the stencil. The combination stencil printer and dispenser further includes a dispenser mounted on the movable stencil to dispense viscous material on the substrate when the substrate is in the print position. In other embodiments, the dispenser can be mounted on a stencil wiper or on an independent gantry provided within the combination stencil printer and dispenser.
Owner:ILLINOIS TOOL WORKS INC

Method and apparatus for supporting and clamping a substrate

A stencil printer for printing viscous material on a substrate includes a frame, a stencil coupled to the frame, and a print head, coupled for the frame, to deposit and print viscous material over the stencil. The stencil printer further includes a substrate supporting and clamping assembly to support and clamp a substrate in a print position. The substrate supporting and clamping assembly includes at least one support member to support the substrate in a print position, a pair of rail members, coupled to the frame, adapted to engage opposite edges of the substrate, and a clamping mechanism, coupled to the frame, to move at least one of the rail members against the substrate to clamp the substrate. The clamping mechanism includes at least one piston to move the at least one of the rail members between a first position in which the rail member is spaced away from one of the opposite edges of the substrate and a second position in which the rail member engages one of the opposite edges of the substrate to clamp the substrate between the rail members during a print operation. The clamping mechanism further includes a pressure regulator to control a clamping force applied by the piston to the rail member against the edge of the substrate. A method for supporting and clamping a substrate in a print position is further disclosed.
Owner:SPEEDLINE TECH

Method and apparatus for dispensing viscous material

A novel apparatus for compressing viscous material through openings in a stencil is disclosed. The novel apparatus has a compression head cap which provides a contained environment to direct and to aid the flow of pressurized viscous material through the openings in the stencil.
Owner:VISTEON GLOBAL TECH INC
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