Claims
- 1. A method for controlling the angular velocity of the output shaft of a motor, the method comprising:
- rotating the motor output shaft at a first angular velocity;
- driving a first transmission using the motor output shaft;
- driving an intermediate shaft at a second angular velocity using the first transmission;
- driving a second transmission using the intermediate shaft, the second transmission being different from the first transmission;
- driving a load using the second transmission;
- converting the second angular velocity into a position signal; and
- controlling the first angular velocity as a function of the position signal.
- 2. The method according to claim 1, further comprising driving the load at a third angular velocity which is less than the second angular velocity.
- 3. The method according to claim 1, wherein the converting step comprises using a rotational encoder.
- 4. The method according to claim 1, wherein the first transmission includes a first belt for driving the intermediate shaft, and the second transmission includes a second belt for driving the load.
- 5. The method according to claim 1, wherein the second transmission includes a flat belt for driving the load.
- 6. The method according to claim 1, further comprising:
- measuring the transmission ratio of the second transmission; and
- converting the position signal and the transmission ratio of the second transmission into a drive signal for driving the motor output shaft at the first angular velocity.
- 7. A system comprising:
- a motor having an output shaft rotatable at a first angular velocity for driving a first transmission;
- an intermediate shaft drivable at a second angular velocity by the first transmission for driving a second transmission, the second transmission being different from the first transmission;
- a load drivably coupled to the second transmission;
- a converter for converting the second angular velocity into aposition signal; and
- a controller for receiving the position signal and for controlling the first angular velocity as a function of the position signal.
- 8. The system according to claim 7, wherein the first transmission comprises a first belt and the second transmission comprises a second belt.
- 9. The system according to claim 7, wherein the second transmission comprises a flat belt.
- 10. The system according to claim 7, further comprising:
- a measurement system for measuring the transmission ratio of the second transmission; and
- a relay system for relaying to the controller the transmission ratio of the second transmission.
- 11. A thermal printer comprising:
- a motor having an output shaft rotatable at a first angular velocity for driving a first transmission;
- an intermediate shaft drivable at a second angular velocity by the first transmission for driving a second transmission, the second transmission having a transmission being different from the first transmission;
- a load drivably coupled to the second transmission, the load having a surface for conveying a heat-sensitive material;
- a thermal head for heating the heat-sensitive material to produce an image thereon;
- a converter for converting the second angular velocity into a position signal; and
- a controller for receiving the position signal and for controlling the first angular velocity as a function of the position signal.
Priority Claims (1)
Number |
Date |
Country |
Kind |
97202947 |
May 1997 |
EPX |
|
Parent Case Info
This application claims the benefit of U.S. provisional Application No. 60/070,586 filed Dec. 11, 1997.
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DEX |
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