US 5,856,733 A · Positioning apparatus

Abstract

The upper limit value and lower limit value of a control target value are alternately supplied to a single D/A converter in synchronism with a clock, an analog output from the D/A converter is compared with an output from a PBR serving as a position detector, and a motor is driven by the difference voltage, thereby positioning the control object. In this case, control of the moving direction and drive/stop of the motor is performed by a combination between the setting states of the upper and lower limit values and the polarity of the difference voltage, and the switching operation of the selector is stopped during a control operation, thereby making it possible to smoothly perform the control operation at a high speed. The control system can be digitized as a whole by detecting a position by an encoder, and integration of the system can be enhanced, thereby realizing a compact and stable control system.

Claims19

Dependent claims

A positioning apparatus, comprising:

drive means for moving a position of a control object;
position detection means for outputting a present position of the control object as a voltage:
a switching circuit for alternately switching an output level to a high level or a low level in synchronism with a clock pulse;
a standard values generating circuit for generating two types of voltage levels representing the upper and lower limit values of an input positioning target value;
a selector for selecting any one of the upper and lower limit values in accordance with an output level of said switching circuit to output a selected value:
comparison means for comparing the output from said selector with the output from said position detection means;
and
control determination means for determining drive contents of said drive means on the basis of an output from said comparison means.

5 more elements

A positioning apparatus, comprising:

drive means for moving a position of a control object;
position detection means for outputting a present position of the control object as a voltage;
a switching circuit for alternately switching an output level to a high level or a low level in synchronism with a clock pulse when receiving a signal indicating OFF for operation of said drive means, and not switching the output level when receiving a signal indicating ON;
a standard values generating circuit for generating two types of voltage levels representing the upper and lower limit values of an input positioning target value;
a selector for selecting any one of the upper and lower limit values in accordance with an output level of said switching circuit to output a selected value;
comparison means for comparing the output from said selector with the output from said position detection means;
and
an ON/OFF determination means for outputting an ON or OFF state to said drive means and said switching circuit in accordance with a logical output from said switching circuit and an output from said comparison means.

5 more elements

Dependencies are inferred from the claim text.

Positioning apparatus

Life of this patent

Positioning apparatus

Life of this patent

Abstract

Claims19