摘要:
An apparatus and method for precisely controlling a driven component (10) in an electromechanical system, particularly for controlling the speed of a photoreceptor or intermediate transfer belt in an electrophotographic printing machine. A sensor (160) monitors the speed of the driven belt (10) and generates and sends a signal indicative thereof to a controller (90). A second sensor monitors the rotational speed of the shaft (172) of the drive motor (170) and also generates a signal indicative thereof and sends that signal to the controller (90). The controller (90) processes the signals so that a preselected belt speed is maintained while minimizing or eliminating torque disturbances caused by the rapid fluctuation of the motor velocity without the necessity of using an inertial flywheel.
摘要:
An apparatus and method for controlling lateral movement of a belt (10) supported on two or more rollers (6,8) in an electrophotographic printing machine. The belt is rotated for several revolutions and the actual profile of the belt edge is sensed and stored. A steering roll is then tilted at an angle (Θ) large enough to overcome any steering system backlash and the belt drift rate is measured. Incremental steering adjustments are then made in the opposite direction until the belt drift rate reverses direction. The steering system backlash is then determined as a function of the incremental angle (θ) (which is a known number of steering motor steps) and the number of corrective steering changes made. The backlash for the system in the opposite direction is then determined in the same manner. Steering corrections to the belt are then made by the belt edge detector (100,102) and printing machine controller (90) with compensation for backlash so that the steering system is more responsive.
摘要:
A single pass highlight color printer is disclosed which utilizes two pairs of Raster Output Scan (ROS) systems mounted symmetrically about a common polygon motor assembly (38,40). Four identical optical systems (30,32,34,36) are thus provided , with diode laser outputs (6,8,10,12) directed from a ROS frame (4') parallel and separated to allow the appropriate spacing for xerographic components situated adjacent the xerographic belt. Each ROS unit includes a 90° mirror pair (36D1,36D2) which is mounted on a roof mirror carriage (36F) which in turn is connected to a focus carriage (36G) via a flexible guide system (50,52,54; 58,60,62). The interaction between the focus carriage and the roof mirror carriage enables a skew alignment and process (beam steering) adjustment to be accomplished with a high degree of precision.
摘要:
A light lens scanning system (8) operable in a document scan mode to reproduce documents (30) onto a photosensitive record medium (12) is modified to operate in a document edit mode. A document is placed face-up on a platen surface by the operator and the edit mode is selected. A laser generated light spot output from a raster output scanner (102) is introduced into the optical system and is directed along an optical path which is opposite to the optical path of a projected document image. The light spot output is visible to the operator at the platen (40) as a light cursor. This movement of the cursor is under control of the operator via switches on the control panel (88). The cursor is moved through x and y coordinates (X o Y o ; X o Y₁; X₁Y₁; X₁Y₀) to delineate an area of the document to be selectively erased. Coordinate positions are entered into a microcontroller memory. Following exposure of the entire image at the record medium, control means (89) generate signals in response to the entered coordinate positions and these signals are used to actuate an erase mechanism for a time sufficient to erase the portion of the copy corresponding to the selected portion of the document.
摘要:
A light lens scanning system (8) operable in a document scan mode to reproduce documents (30) onto a photosensitive record medium (12) is modified to operate in a document edit mode. A document is placed face-up on a platen surface by the operator and the edit mode is selected. A laser generated light spot output from a raster output scanner (102) is introduced into the optical system and is directed along an optical path which is opposite to the optical path of a projected document image. The light spot output is visible to the operator at the platen (40) as a light cursor. This movement of the cursor is under control of the operator via switches on the control panel (88). The cursor is moved through x and y coordinates (X o Y o ; X o Y₁; X₁Y₁; X₁Y₀) to delineate an area of the document to be selectively erased. Coordinate positions are entered into a microcontroller memory. Following exposure of the entire image at the record medium, control means (89) generate signals in response to the entered coordinate positions and these signals are used to actuate an erase mechanism for a time sufficient to erase the portion of the copy corresponding to the selected portion of the document.
摘要:
A printing apparatus comprises a plurality of substantially identical modules forming a common sheet path. Each module includes an image receptor, a supply of marking material of a predetermined type, and a marking engine for creating an image of marking material on the sheet. Within each module a transport receives a sheet, moves the sheet to receive the image from the marking engine, and makes the sheet available for printing by a subsequent module in the sheet path. A sheet sensing system within each module detects a position of the sheet and uses that information to adjust the position of the image to be transferred to the sheet.
摘要:
A printing apparatus comprises a plurality of substantially identical modules forming a common sheet path. Each module includes an image receptor, a supply of marking material of a predetermined type, and a marking engine for creating an image of marking material on the sheet. Within each module a transport receives a sheet, moves the sheet to receive the image from the marking engine, and makes the sheet available for printing by a subsequent module in the sheet path. A sheet sensing system within each module detects a position of the sheet and uses that information to adjust the position of the image to be transferred to the sheet.
摘要:
A method of maintaining a rotational velocity of an imaging drum (14) during engagement with a transfer roll (22) in an image producing device including: forming a nip (29) 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.