Claims
- 1. A method for testing an electroconductive roller which is to be installed in an image forming apparatus, comprising steps of:
- a first step of setting a formed electroconductive roller at a position where a glossimeter can perform measurement on said electroconductive roller;
- a second step of measuring glossiness of an outer circumferential surface of said electroconductive roller using said glossimeter;
- a third step of performing a predetermined calculation on glossiness information of the outer circumferential surface of said electroconductive roller measured by said glossimeter; and
- a fourth step of comparing the result of said calculation with a predetermined threshold value and judging surface condition of said electroconductive roller.
- 2. The method according to claim 1, wherein at said second step, said electroconductive roller is rotated on its central axis,
- and wherein said glossiness is measured along at least a circumferential direction of the outer circumferential surface of said electroconductive roller using said glossimeter.
- 3. The method according to claim 2, wherein said glossiness is measured at two positions at least.
- 4. The method according to claim 2, wherein said glossiness is continuously measured.
- 5. The method according to claim 2, wherein at said second step, said glossiness is measured while a relative position between said electroconductive roller and said glossimeter is moved along the central axis of said electroconductive roller.
- 6. The method according to claim 1, wherein at said third step, calculation is performed to extract a maximum value and a minimum value of glossiness information measured by said glossimeter and obtain ac difference between logarithms of the maximum and minimum values.
- 7. The method according to claim 6, wherein at said fourth step, if the difference between the logarithms is less than the predetermined threshold value, it is judged that the surface condition of said electroconductive roller is good, while if the difference is equal to or greater than the predetermined threshold value, it is judged that the surface condition of said electroconductive roller is no good.
- 8. The method according to claim 1, wherein at said third step, calculation is performed to extract a maximum value and a minimum value of glossiness information measured by said glossimeter, obtain a difference between the maximum and minimum values, and obtain a ratio of the difference with respect to an average value of the glossiness information.
- 9. The method according to claim 8, wherein at said fourth step, if the ratio is less than the predetermined threshold value, it is judged that the surface condition of said electroconductive roller is good, while if the ratio is equal to or greater than the predetermined threshold value, it is judged that the surface condition of said electroconductive roller is no good.
- 10. The method according to claim 1, wherein said method is used for testing a developing roller in an image forming apparatus.
- 11. An apparatus for testing an electroconductive roller which is to be installed in an image forming apparatus, comprising:
- placement means for placing a formed electroconductive roller, rotatably;
- rotation means for rotate-driving said electroconductive roller placed on said placement means, on a central axis of said electroconductive roller;
- measurement means for measuring glossiness of an outer circumferential surface of said electroconductive roller rotate-driven by said rotation means;
- calculation means for performing a predetermined calculation on glossiness information obtained by said measurement means; and
- judgment means for comparing the result of the calculation with a predetermined threshold value and judging surface condition of said electroconductive roller.
- 12. The apparatus according to claim 11, further comprising:
- moving means for moving a relative position between said electroconductive roller and said measurement means along an axial direction of said electroconductive roller by moving a position of measurement by said measurement means along the axial direction.
- 13. The apparatus according to claim 11, wherein said testing apparatus is used for testing a developing roller in an image forming apparatus.
Priority Claims (2)
Number |
Date |
Country |
Kind |
9-074652 |
Mar 1997 |
JPX |
|
9-074651 |
Jun 1997 |
JPX |
|
Parent Case Info
This application is a divisional application of U.S. patent application Ser. No. 09/036,157 filed Mar. 6, 1998.
US Referenced Citations (10)
Divisions (1)
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Number |
Date |
Country |
Parent |
036157 |
Mar 1998 |
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