Procedure and apparatus for fault location in the functioning of machine elements of a paper machine

Patent 5358606 Issued on October 25, 1994. Estimated Expiration Date:

October 25, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3687802

3852578

Apparatus for web caliper control
Patent #: 4114528
Issued on: 09/19/1978
Inventor: Walker

Control system for papermaking machine headbox Patent #: 4374703
Issued on: 02/22/1983
Inventor: Lebeau , et al.

Inventor

Makkonen, Timo

Application

No. 689664 filed on 04/23/1991

US Classes:

162/49, With testing, sampling or analyzing162/198, With measuring, inspecting and/or testing162/253, Of plural operations162/263Measuring, testing, inspecting, indicating or illuminating

Examiners

Primary: Alvo, Steve

Attorney, Agent or Firm

Andrus, Sceales, Starke & Sawall

International Class

D21F 007/06

Abstract

A procedure and apparatus for locating faults in the machine elements of a paper machine and in their functioning, wherein variations in the paper characteristics are continuously observed, the periodicity of the variations is recorded and the periodicity of the variations in the paper characteristics is compared with the periodicity in the functioning of the paper machine's machine elements. The apparatus comprises observation members (1-11) for observing the variations occurring in the paper characteristics; synchronizing pick-ups (43-53) disposed on machine elements (13-22) of the paper machine for observing the periodicity of the functioning of said machine elements; a recording means (40) for recording the periodicity of the variations in paper characteristics and the periodicity in the functioning of the machine elements; and a data processing unit (41) for comparing the periodicity of the variations in paper characteristics and that in the functioning of the machine elements.

Other References

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Mardon et al; "Pressure Fluctuations in Headbox Approach Piping"; Pulp & Paper Canada, vol. 75, No. 2 Feb. 1974, p. 83
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Pulp & Paper, "Goal: Computer from 1 Year of Order Result: DDC or Time"; Apr. 1970
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