公开(公告)号：US3568027A

公开(公告)日：1971-03-02

申请号：US3568027D

申请日：1969-11-18

Applicant: IBM

Inventor： BACON JAMES L ,  CLEAVE GEORGE W

IPC: H02P7/06 ,  H02P7/288 ,  H02P5/16

CPC classification number: H02P7/288 ,  H02P7/2885 ,  Y10S388/902 ,  Y10S388/91 ,  Y10S388/917 ,  Y10S388/934

Abstract: The invention concerns a motor control circuit especially useful with small direct-current-type motors and featuring a symmetrical circuit topology that achieves motor regulation and temperature compensation in a simplified manner. The circuit includes an upper portion comprising a motor model section for establishing a reference voltage to determine the speed of the motor, a parallel circuit section including the motor itself, a lower section intended for detection of current changes in the motor section, and a difference amplifier interconnected with the motor model and motor sections for maintaining an essentially zero potential difference between these sections. The symmetrical layout achieves a highly accurate measure of control over motor speed once a nominal speed has been established. Due to the symmetrical configuration of the circuit, effects of temperature and humidity are essentially eliminated. Some provision is made for alternative ways of controlling the desired motor speed including a variable control for changing motor speed in a regular fashion throughout a desired range of speeds.

公开(公告)号：US3884572A

公开(公告)日：1975-05-20

申请号：US31797472

申请日：1972-12-26

Applicant: IBM

Inventor： BACON JAMES L ,  SIMPSON HENRY W

IPC: B08B1/04 ,  G03G21/00 ,  G03G21/10 ,  B08B1/02

CPC classification number: G03G21/0058

Abstract: A cleaning apparatus for cleaning the residual toner image from an electrostatic plate of an electrostatic reproduction apparatus incorporates a continuous wiper member having an outer layer of a compliant material which has a resistivity of less than 10 8 ohm.- centimeters and an outer skin thereon. The wiper member is connected to ground. As the wiper member wipingly engages the toner particles, the toner partricles are mechanically dislodged from the surface of the electrostatic plate. Additionally, an image charge is produced on the outer skin surface of the conductive wiper member equal to but opposite in sign from the charge on the toner particles in proximity therewith. This image charge causes the toner particles to adhere to the skin surface as the wiper member moves away from the electrostatic plate regardless of the sign of the toner charge. A further cleaning member is utilized to remove the toner particles from the skin surface of the wiper member which travels in a closed loop past the electrostatic plate and the further cleaning member.