Method and apparatus for controlling spring rate and leverage in

Details Method and apparatus for controlling spring rate and leverage in Method and apparatus for controlling spring rate and leverage in

1989-04-13

1990-03-13

Crowder, Clifford D.

Printing

Stenciling

Multicolor

1011271, 101129, B41F 1510, B41F 1534

Patent

active

049075063

ABSTRACT:
An adjustment device for a screen printing machine wherein the tension on pivotally mounted screen holding arms may be adjusted to accommodate screens of various sizes and weights. The adjustment device includes a vertically adjustable connector to which one end of a coil spring associated with a screen holding arm is connected. The adjustment device includes at least one bolt which mounts the connector for up or down movement upon rotation of the bolt, so that the connector, and spring, are moved relative to a horizontal plane containing the pivot axis of the screen holding arm. By suitably adjusting the spring connector via rotation of the bolt, the spring rate may be altered and leverage is created for moving the spring to up and down positions. An adjustment device for accomplishing similar results in used for gas compression cylinders extending between screen holding arms and the machine head.

REFERENCES:
patent: 270368 (1883-01-01), Barlow
patent: 367020 (1887-07-01), Barlow
patent: 1908984 (1933-05-01), Katz
patent: 1992048 (1935-02-01), Temple
patent: 2704510 (1955-03-01), Walsh, Jr.
patent: 2955813 (1960-10-01), Hume
patent: 3427964 (1969-02-01), Vasilantone
patent: 4266476 (1981-05-01), Maloof
patent: 4606268 (1986-08-01), Jaffa
Ranar Manufacturing Compnay Brochure Entitled "Model P-110 Manual T-Shirt Printer", one sheet.
Antec Brochure "Screen Printing Equipment Engineered for the Hands", thirteen sheets.
Hopkins International brochure "1/C One Color Frames".

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