Boots – shoes – and leggings
Patent
1994-08-31
1999-11-23
Elmore, Reba I.
Boots, shoes, and leggings
101123, 101126, 101129, G06F 1900, G06G 764, G06G 766
Patent
active
059888563
ABSTRACT:
The apparatus may be used with printing apparatus in which a media spreading member, such as a squeegee, moves relative to a surface, causing printing medium to be moved across said surface. The printing medium can be electrical solder paste and the surface can be a stencil. The apparatus is used for measuring linking parameters that are related to mechanical properties of the printing medium and the printing environment, such as viscosity and coefficient of friction. The apparatus comprises means for measuring a machine parameter that represents the force experienced by the media spreading member and means for resolving the measured force parameter into components equivalent to two orthogonal components, typically normal to the surface and tangential to it in the direction of relative motion. The apparatus also includes means for measuring a machine parameter that represents the velocity of the media spreading member relative to the surface. Means are also provided for measuring the linking parameters by determining a specific instance of a predetermined general relation among the measured machine parameters of velocity, first force component and second orthogonal force component and the linking parameters. The means for determining a specific instance of a relation may include means for comparing at least three sets of associated measured machine parameters and, based on the comparison, identifying a relationship that shows agreement with all of the sets of measured machine parameters within a predetermined level of accuracy. A typical such means for identifying such a relationship is an apparatus that applies a least squares relationship selecting technique. Suitable general relationships for Newtonian and non-Newtonian fluids may be used. A method is also disclosed.
REFERENCES:
patent: 4817524 (1989-04-01), Riemer
patent: 5052291 (1991-10-01), Takahashi et al.
patent: 5174201 (1992-12-01), Andris et al.
patent: 5436028 (1995-07-01), Becher et al.
Liu, J. et al, "Development of 0.5 and 0.65 mm Pitch QPF Technology in Surface Mounting", IEEE/CHMT Int'l Electronics Manufacturing Technology Symposium, 1993, pp. 52-55.
J. Owczarek et al, "A Study of the Off-Contact Screen Printing Process--Part 1: Model of the Printing Process and Some Results Derived From Experiments", IEEE Transactions on Components, Hybrids and Manufaacturing Technology, vol. 13, No. 2, Jun. 1990, pp. 358-367.
J. Owczarek et al, "A Study of the Off-Contact Screen Printing Process--Part II:Analysis of the Model of the Printing Process", IEEE Transactions on Components, Hybrids, and Manufacturing Technology, vol. 13, No. 2, Jun. 1990, pp. 368-375.
S. Mannan et al, "Squeegee Deformation Study in the Stencil Printing of Solder Pastes", IEEE Transactions on Components, Packaging and Manufacturing Technology--Part A, vol. 17, No. 3, Sep. 1994, pp. 470-476 (Not admitted to be prior art).
John R. Morris et al, "Stencil Printing of Solder Paste for Fine-Pitch Surface Mount Assembly", IEEE Transactions on Components, Hybrids, and Manufacturing Technology, vol. 14, No. 3, Sep. 1991.
Evans, John W. and Beddow, John Keith, "Characterization of Particle Morphology and Rheological Behavior in Solder Paste," IEEE Transactions on Components, Hybrids, and Manufacturing Technology, 10(2), pp. 224-231, (Jun. 1987).
T.F. Hanrahan, P.F. Monaghan and R.D. Babikian, "Modelling of a Solder Paste Flow with a Free Surface in Stencil Printing," ASME/JSME Conference on Electronics Packaging, pp. 587-592, (1992).
C. Hancock, E. Lewis and H.K. Moffatt, "Effects of Inertia in Forced Corner Flows," Journal of Fluid Mechanics, v. 112, pp. 315-327, (1981).
Taylor, Geoffrey, "On Scraping Viscous Fluid From a Palne Surface." in The Scientific Papers of Sir Geoffrey Ingram Taylor, Cambridge University Press, pp. 410-413, (1971).
Taylor, Geoffrey, "Similarity Solutions of Hydrodynamic Problems," in Aeronautics and Astronautics, Proceedings of the Durand Centennial Conference, Stanford University Aug. 5-8, 1960), pp. 21-28, Pergaman Press, New York, (1960).
Dean, W.R. & Montagnon, P.E., "On the Steady Motion of Viscous Liquid in a Corner," Proceedings of the Cambridge Philosophical Society, pp. 45:389-394, (1949).
Asada Haruhiko
Braunstein Daniel J.
Elmore Reba I.
Massachusetts Institute of Technology
Rao Sheela S.
Weissburg Steven J.
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