SU402050A1 - CORNER CONVERTER - CODE - Google Patents

Description

one

The invention relates to the field of automation, computer technology.

Angle-to-code converters are known that contain a constant-speed rotating drum with two code tracks, a fixed and a movable head, an electronic key and a pulse counter. On the first track there are code marks, on the second one check mark. On the first track there is one fixed reading head, on the second one there is a fixed and movable control head.

Various designs of such converters are known, differing in the type of applied code carriers of the sensing heads. In industrial conditions, contact, magnetic modulation, transformer, and inductive heads are mainly used. The low resolution of such devices limits the number of code marks, and therefore the accuracy of the conversion.

The aim of the invention is to improve the accuracy of converting the angle of rotation of the shaft to a digital code.

This goal is achieved by the fact that in the proposed device, selectors of the leading and trailing edge are connected to the output of the key. Moreover, the front-edge selector is connected to one of the inputs of the OR circuit directly, and the rear-edge selector via an additional key, the input of which is connected to the front-edge selector via a pulse shaper of the reference duration. The drawing shows a block diagram of the Converter.

The converter consists of a drum I with code marks 2 and a control mark 3, a read head 4, a fixed control head 5, a movable control head 6 fixed on the axis 7, a key 8, a front edge selector 9, a rear front selector 10, an additional key 11, the pulse shaper of the reference duration 12 and the “OR 13.

The drum 1 rotates at a constant speed, and its axis of rotation coincides with the axis 7, the angle of rotation 6, which is measured. Drum 1 has two tracks. On the first track

code marks 2 are applied through equal angular distances. On the second there is one control mark 3. Heads 4, 5 are fixed and are in the plane relative to which angle θ is measured. The head 6 is fixed on

axles 7.

The Converter operates as follows.

When the drum rotates, the reading head 4 generates code pulses that are fed to the input of the key 8. Control

The key is realized by heads 5 and 6. Key 8 opens when check mark 3 passes by head 5 and closes when this mark coincides with head 6. The number of pulses at the output of key 8 is proportional to the measured angle c.

The duration of the last code pulse depends on the moment when the key 8 is fixed.

From the output of the key 8, the pulses arrive at the selectors 9, 10, which select the leading and trailing edges of the code pulses.

Shaper 12 is fired from the leading edge of the code pulses. The duration of the reference pulse is set to half the code pulse.

The driver 12 controls an additional key 11. If the duration of the last code pulse is less than half, then when a pulse appears at the output of the trailing edge selector 10, the key 11 is still closed. In this case, the output of the OR 13 circuit receives 9 pulses with 5 read pulses. Whereas with the duration of the last code pulse more than half

key 11 is open, and on the output of the OR 13 circuit, 10 pulses are received with 5 read pulses.

Subject invention

Angle-code converter containing a drum with code tracks, reading and control heads connected to a key, characterized in that, in order to improve the accuracy of the conversion, selectors of the falling and leading edges of the pulse, an additional key, an OR circuit and a driver pulses of reference duration; the inputs of the front and rear edges are connected to the output of the key, the output of the front edge of the pulse is connected to one of the inputs of the OR circuit, and the output of the rear edge selector is connected to another input of the OR circuit through an additional key the leading edge of the pulse through the pulse shaper of the reference duration.