Printer belt drive control circuit

• US 6,538,409 B2
• Filed: 01/10/2001
• Issued: 03/25/2003
• Est. Priority Date: 01/12/2000
• Status: Expired due to Fees

• Current Assignee: Fuji Xerox Company Limited (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Xerox Company Limited (Fujifilm Holdings Corporation)
• Inventors: Takemoto, Hitoshi
• Primary Examiner(s): Masih, Karen
• Application Number:
  US09/757,933
• Publication Number:
  US 20010007415A1
• Time in Patent Office: 804 Days
• Field of Search: 318/560, 318/567, 318/569, 318/600, 318/798, 318/3
• US Class Current: 318/560
• CPC Class Codes: G03G 15/5008 Driving control for rotary photosensitive medium, e.g. speed control, stop position control

Abstract

A printer belt drive control circuit comprises: an encoder count circuit (4) for counting output signals from a drive encoder (11) attached to a drive motor (10) and from a motor encoder attached to a belt motor (6), a servo controller which under control of a CPU (1) and outputs a rotation speed information of the belt motor (6) according to tan output signal from the encoder count circuit (4), and a motor drive signal generation circuit for converting an output information from the servo controller (2) into a form appropriate for an H-bridge driver circuit (5) which directly drives the belt motor (6)

Claims

1. A printer belt drive control circuit comprising:

a first encoder attached to a drive roller for driving a belt to be controlled,

a second encoder attached to a main shaft of a motor for driving the drive roller, and

a servo circuit for controlling a rotation speed of a motor driving the drive roller to be constant according to an output signal from the first encoder and an output signal from the second encoder.

2. A printer belt drive control circuit comprising:

an encoder count circuit for counting output signals from a drive encoder attached to a drive roller and from a motor encoder attached to a belt motor,

a servo controller which under control of a CPU and outputs a rotation speed information of the belt motor according to an output signal from the encoder count circuit, and

a motor drive signal generation circuit for converting an output information from the servo controller into a signal that is able to drive an H-bridge driver circuit which directly drives the belt motor.

3. A printer belt drive control circuit as claimed in claim 2, wherein the servo controller includes:

an internal ROM contains a program of a control algorithm used for driving a belt and computation equations for control by a software servo method, and

an internal register containing servo constants and servo parameters used for a servo computation, which are read out, when necessary, to be substituted in a computation equation.

4. A printer belt drive control circuit as claimed in claim 2, characterized in that the belt drive control circuit is controlled in a closed loop.

5. A printer belt drive control circuit as claimed in claim 2, characterized in that the belt drive control circuit is controlled in a closed loop using software servo control.