Electricity: motive power systems – Motor-reversing – Automatic and/or with time-delay means
Reexamination Certificate
1996-10-09
2001-07-10
Wysocki, Anthony (Department: 2837)
Electricity: motive power systems
Motor-reversing
Automatic and/or with time-delay means
Reexamination Certificate
active
06259219
ABSTRACT:
This invention relates generally to an electrophotographic printing machine, and more particularly concerns an improved method and apparatus for controlling the lateral movement of a moving belt.
In a typical electrophotographic printing process, a photoconductive member is charged to a substantially uniform potential so as to sensitize the surface thereof. The charged portion of the photoconductive member is exposed to a light image to selectively dissipate the charges thereon in the irradiated areas. This records an electrostatic latent image on the photoconductive member corresponding to the informational areas contained within the original document. After the electrostatic latent image is recorded on the photoconductive member, the latent image is developed by bringing a developer material into contact therewith. Generally, the developer material comprises toner particles adhering electrostatically to carrier granules. The toner particles are attracted from the carrier granules to the latent image forming a toner powder image on the photoconductive member. The toner powder image is then transferred from the photoconductive member to a copy sheet by “tack” transfer: i.e., the copy sheet is attached to the photoreceptor with a sufficiently high force to overcome external forces that might otherwise tend to cause slip. The toner particles are heated to permanently affix the powder image to the copy sheet.
The foregoing generally describes a typical black and white electrophotographic printing machine. With the advent of multicolor electrophotography, it is desirable to use the so-called tandem architecture which comprises a plurality of image forming stations. This tandem architecture offers potential for high throughput and image quality. One choice of photoreceptors in this tandem engine architecture is a drum based photoreceptor architecture used in combination with an intermediate transfer medium. Belt type photoreceptors can also be used in combination with either an intermediate transfer belt or an intermediate transfer drum.
The following disclosures may be relevant to various aspects of the present invention:
U.S. Pat. No. 5,204,602Patentee: Iwashita Date of Issue: Apr. 20, 1993
U.S. Pat. No. 5,073,746Patentee: Sakamoto, et al Issue Date: Dec. 17, 1991
U.S. Pat. No. 4,645,991Patentee: Ban, et al Issue Date: Feb. 24, 1987
U.S. Pat. No. 3,655,954Patentee: Speth Issue Date: Apr. 11, 1972
The relevant portions of the foregoing disclosures may be briefly summarized as follows:
U.S. Pat. No. 5,204,602 describes a servo motor control method capable of automatically affecting optimum backlash acceleration correction under various machine operating conditions. A backlash acceleration correction process is started when the sign of a positional deviation is inverted, and is cyclicly executed thereafter. A cutting speed is estimated from the square root of the positional deviation at the start of the correction process, and a constant, used to calculate a backlash acceleration amount, and a backlash acceleration time are calculated in accordance with the estimated cutting speed. By inverting the sign of the output of an integrator of a speed loop, moreover, a target value is obtained which is equal in magnitude to the integrator output and whose sign is opposite to that of the integrator output. In each processing cycle, the product of the constant and the difference between the target value and the present integrator output is obtained, and a torque command to be used for the drive control of the servo motor is obtained in accordance with the speed command after the backlash acceleration correction, which is obtained by adding the resultant product to a speed command calculated in a position loop process.
U.S. Pat. No. 5,073,746 discloses a speed control method for a servo motor capable of smoothly rotating the servo motor without causing pulsating rotation even when the servo motor rotates at low speeds. On the basis of numbers f feedback pulses detected and stored at intervals of a period equal to a value obtained by dividing an estimated speed calculation period by an integer multiple of two, the number of feedback pulses in each estimated speed calculation period and the number of pulses in a time period from a mid point of an estimated speed calculation period immediately before each estimated speed calculation period to a mid point of each estimated speed calculation period are calculated, and an estimated speed indicative of an actual rotation speed of the servo motor is further calculated on the basis of the calculated numbers of pulses.
U.S. Pat. No. 4,645,991 discloses an apparatus for removing torque ripples which comprises a permanent magnet rotor position sensors stator armature coils in operational circuit for affecting arithmetic operation on detected signals from the position sensors and a control circuit for driving the stator armature coils. According to another embodiment, an apparatus for removing torque ripples includes a direct current motor having Y connected armature coils, a detector for detecting the counter electromotive forces in the direct current motor, an operational circuit for effecting an arithmetic operation on output signals from the detector and a transistor for driving the direct current motor.
U.S. Pat. No. 3,655,954 discloses a closed loop system having are regulated system portion having a number of integration members. The regulator feedback which is connected between output and input of the regulated system portion comprises regulator control means for automatically adapting the amplification of the regulator to variations in application occurring in the regulated system portion during operation of the latter. The regulator control means comprises a first differentiating stage of the nth order, on at least partial analog of said regulated system portion, a quotient forming divider having two inputs of which one is connected to the first differentiating stage to the output of the regulated system portion, and the other is connected through the analog to the input of the regulated system portion. A second differentiating stage is connected with the analog and adapted for phase coincidence of the two signals at the respective two in points of the quotient forming divider.
In accordance with one aspect of the present invention, there is provided an apparatus for controlling the velocity of a motor driven component of an electromechanical system. The apparatus comprises a first sensor adapted to detect the velocity of the driven component and generate a first signal indicative thereof, a second sensor adapted to detect the velocity of the motor and generate a second signal indicative thereof and a controller, responsive to the first signal and the second signal, for generating a motor control signal.
Pursuant to another aspect of the present invention, there is provided a method for controlling the velocity of a motor driven component of an electromechanical system. The method comprises detecting the velocity of the driven component and generating a first signal indicative thereof, detecting the velocity of the motor and generating a second signal indicative thereof and generating a motor control signal as a function of the first signal and the second signal.
Pursuant to yet another aspect of the present invention, there is provided an electrophotographic printing machine having a precise velocity control for driving a member. The machine comprises a motor operatively connected to the member, and a first sensor operatively associated with the member to detect the velocity of the driven member and generate a first signal indicative thereof. A second sensor, to detect the velocity of said motor and generate a second signal indicative thereof and a controller, responsive to the first signal and the second signal to generate a motor control signal are also provided.
REFERENCES:
patent: 3655954 (1972-04-01), Speth
patent: 4529920 (1985-07-01), Yoshida et al.
patent: 4563625 (1986-01-01), Kornbrekke et al.
patent: 4645991 (1987-02-01), Ban et a
Costanza Daniel W.
Strauch Andrew Mark
Kepner Kevin R.
Wysocki Anthony
Xerox Corporation
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