Coating apparatus – With vacuum or fluid pressure chamber
Patent
1976-07-08
1978-02-28
McIntosh, John P.
Coating apparatus
With vacuum or fluid pressure chamber
101124, 101126, 118213, 118233, B05C 116, B41M 112
Patent
active
040759687
ABSTRACT:
A "silk screen" is provided with a patterned pervious portion the dimension of which, in the direction of screen movement, is substantially less than the circumference of the cylindrical substrate. The screen is then moved beneath a squeegee through a distance which is greater than the indicated dimension of the pattern but less than the substrate circumference, the result being that a thick film of resistive material is metered onto the substrate without any overlapping or smearing. The squeegee, at the end of the screen-printing stroke, is located at an impervious portion of the screen, so that even unspindled small-diameter ceramic substrates are disengaged from the screen with no sticking or smearing. Such cylindrical substrates are solid in order to be economical, and to permit zero moisture intrusion. It is a feature of the invention that such economical solid substrates can be used, and are driven solely by screen friction so that loading, unloading and other problems are minimized.
The apparatus makes use of limit switches, an air cylinder, a certain type of stabilized squeegee, and friction-minimizing components to effect very smooth and substantially vertical lift-off of the squeegee from a precisely-determined region of the screen, the result being that a high degree of repeatability is achieved. The apparatus further employs a certain type of cylinder carriage, and preset stop devices, to make it extremely easy to load and unload the machine and to make it simple to change to different sizes of cylindrical substrates. The apparatus employs a compound lever system for the squeegee support arm and the flood-bar support arm, which system operates smoothly and simply to achieve the precise desired movements of the flood bar and squeegee. The apparatus employs an air jet in a predetermined manner to separate certain types of resistors from the screen, thus greatly extending the capability of the apparatus.
REFERENCES:
patent: 1930153 (1933-10-01), Smith et al.
patent: 2301119 (1942-11-01), Holbrook
patent: 2498917 (1950-02-01), Gattuso
patent: 2629321 (1953-02-01), Gattuso
patent: 3028803 (1962-04-01), Steede
patent: 3109365 (1963-11-01), Karlyn
patent: 3249045 (1966-05-01), Karlyn
Gausewitz Richard L.
McIntosh John P.
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