Transfer roll engagement method for minimizing media induced motion quality disturbances
AssigneeXerox Corporation
InventorsJames P. Calamita, Daniel W. Costanza
Life of this patent
Estimating the term…
Abstract
A method of maintaining a rotational velocity of an imaging drum during engagement with a transfer roll in an image producing device including: forming a nip to transfer an image from the imaging drum to media when the imaging drum is in engagement with the transfer roll; maintaining a substantially constant imaging drum rotational velocity mode during engagement with the transfer roll; sensing a lead edge of portion of the media prior to entering the nip; augmenting torque assist to increase the torque of the transfer roll when the media is in the nip for a defined period; and resuming the substantially constant imaging drum rotational velocity mode while a second portion of the media is in the nip.
Claims5
A method of maintaining a rotational velocity of an imaging drum during engagement with a transfer roll in an image producing device comprising:
- forming a nip to transfer an image from said imaging drum to media when said imaging drum is in engagement with the transfer roll;
- maintaining a substantially constant imaging drum rotational velocity mode during engagement with the transfer roll;
- sensing a lead edge of portion of said media prior to entering the nip;
- activating torque assist to increase the velocity of said transfer roll when said media is in said nip for a defined period;
- resuming said substantially constant imaging drum rotational velocity mode while a second portion of said media is in the nip;
- and
- sensing the trailing of said media prior enter the nip;
- activating torque assist to decrease the velocity of said transfer roll when said media is in said nip for a second defined period;
- and
- resuming said substantially constant imaging drum rotational velocity mode after said media has left the nip.
A method of maintaining a rotational velocity of an imaging drum during engagement with a transfer roll in an image producing device comprising:
- forming a nip to transfer an image from said imaging drum to media when said imaging drum is in engagement with the transfer roll;
- maintaining a substantially constant imaging drum rotational velocity mode during engagement with the transfer roll;
- sensing a lead edge of portion of said media prior to entering the nip;
- activating torque assist to increase the velocity of said transfer roll when said media is in said nip for a defined period;
- said activating torque assist includes adjusting a current set point of a transfer roll drive to maintain a substantially constant imaging drum rotational velocity when said media enters the nip;
- and
- resuming said substantially constant imaging drum rotational velocity mode while a second portion of said media is in the nip.
A method of maintaining a rotational velocity of an imaging drum during engagement with a transfer roll in an image producing device comprising:
- forming a nip to transfer an image from said imaging drum to media when said imaging drum is in engagement with the transfer roll;
- maintaining a substantially constant imaging drum rotational velocity mode during engagement with the transfer roll;
- sensing a lead edge of portion of said media prior to entering the nip;
- activating torque assist to increase the velocity of said transfer roll when said media is in said nip for a defined period;
- said activating torque assist includes adjusting a current set point of a transfer roll drive to maintain a substantially constant imaging drum rotational velocity as said media leaves the nip;
- and
- resuming said substantially constant imaging drum rotational velocity mode while a second portion of said media is in the nip.
Dependencies are inferred from the claim text.