Device for determining the degree of wear of a paper transport r

Details Device for determining the degree of wear of a paper transport r Device for determining the degree of wear of a paper transport r

1998-05-20

2000-04-25

Font, Frank G.

Optics: measuring and testing

Inspection of flaws or impurities

356446, G01N 2188, G01N 2147

Patent

active

060550473

ABSTRACT:
The degree of wear of the paper transport roller (10) is checked by means of a reflected light barrier (40). To that end, the paper transport roller (10) comprises two layers (13 and 15) applied to the core of the paper transport roller (10). The two layers (13 and 15) differ in their degree of reflection for electromagnetic radiation. The layers (13 and 15) are applied to the paper transport roller (10) such that the inner layer (13) has a lower degree of reflection than the outer layer (15). The inner layer (13) is advantageously black and the outer layer (15) white. When the outer layer (15) is worn as a result of the friction between the single sheet (30) to be transported and the paper transport roller (10), the inner layer (13) gradually comes into contact with the single sheets. The degree of reflection of the surface of the paper transport roller (10) then also changes in the same way and is determined using a reflected light barrier (40). The user is therefore signaled that the paper transport roller (10) must be replaced.

REFERENCES:
patent: 4763637 (1988-08-01), Mayer
patent: 5199703 (1993-04-01), Hess
patent: 5379994 (1995-01-01), Kushida
patent: 5394227 (1995-02-01), Huffman et al.
patent: 5435543 (1995-07-01), Lehmann
patent: 5553845 (1996-09-01), Sawa et al.

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