Claims
- 1. A computer program product comprising:a computer readable medium and a computer program code mechanism embedded in the computer storage medium for causing a processor control an image forming device subsystem, the computer program code mechanism comprising: a first computer code device configured to read a first charge value from a sensor as the sensor senses a photoconductive element having a background condition at a first time: a second computer code device configured to drive a transfer sheet at a second time: a third computer code device configured to read a second charge value from the sensor as the sensor senses a toner pattern on the photoconductive element at a third time; and a fourth computer code device configured to detect a paper jam based on relative timings of the first, second and third times.
- 2. The computer program product as claimed in claim 1, further comprising:a fifth computer code device configured to read a third charge value from the sensor as the sensor senses a toner image on the transfer sheet at a fourth time, wherein the first computer code device further comprises a sixth computer code device configured to read a fourth charge value from the sensor as the sensor senses the photoconductive element having the background condition at a fifth time, and wherein the fourth computer code device further comprises a seventh computer code device configured to detect a paper jam based on relative timings of the second and fifth times.
- 3. The computer program product as claimed in claim 1, further comprising a fifth computer code device configured to compensate for aging of the photoconductive element by modifying the second charge value.
Priority Claims (2)
Number |
Date |
Country |
Kind |
10-36725 |
Feb 1998 |
JP |
|
98-6812 |
Dec 1998 |
JP |
|
Parent Case Info
This application is a Division of application Ser. No. 09/241,856 Filed on Feb. 2, 1999 now U.S. Pat. No. 6,144,811.
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Date |
Kind |
5019856 |
Ohashi et al. |
May 1991 |
A |
5406354 |
Taki et al. |
Apr 1995 |
A |
5860038 |
Kato et al. |
Jan 1999 |
A |
Foreign Referenced Citations (1)
Number |
Date |
Country |
9-319224 |
Dec 1997 |
JP |