JPS6132608B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrical reference pulse generator for measuring unbalance angular positions in any rotating body having marks.

In the known device (DE 1103637), a scanning pulse of needle-shaped pulses is generated from a photoelectrically or electromagnetically scanned mark, from which a reference pulse for measuring the unbalanced angular position is extracted. be done. This results in a square-wave voltage consisting of precisely shaped pulses and with little superimposition of harmonics. The well-known photoelectric angular position generator (German patent no. 1103639
No. 1, Specification), a reference pulse is generated which makes it possible to measure the unbalanced angular position, also by scanning a relatively narrow mark on the rotating body.

A drawback of the known devices for generating electrical reference pulses is that the accuracy of the pulses generated is influenced by the accuracy with which the scanned marks are placed on similar or different counterbalances. A further disadvantage of this type of device is that it can only be used with scanned marks of narrow width. Furthermore, the known device has the disadvantage that it is not possible to detect and eliminate errors that lead to changes in the sharpness of the pulses, which are inevitable due to the aging of the photocells used, and thus to a deterioration in the accuracy of the generation of the reference signal. The object of the present invention is to
Furthermore, it is an object of the present invention to generate reference pulses free of interference pulses, which correspond to the requirements of balancing technology with regard to the reproducibility of the measurement results, regardless of the optoelectronic or electromagnetic system used. According to the present invention, this problem can be solved by
The output side of the mark scanning device is connected to the input side of the pulse shaping circuit arrangement, such that the scanning mark pulses are taken from the output side of the pulse shaping circuit arrangement, via a gate that is opened at the beginning of the scanning mark pulse. The counting pulses generated by the pulse generator are applied to a digital counter, and the counting state of the digital counter is transferred to the digital accumulator at the end of the scanning mark pulse under control action by the trailing edge of the scanning mark pulse. By erasing the contents of the digital counter and, in a comparator stage, comparing the value counted and entered in dependence on the next scanning mark pulse with a part of the stored value, and generating a reference pulse if they are equal. resolved.

The advantage of the present invention is that an accurate reference pulse is always generated regardless of the rotation speed of the balance body and regardless of the shape or position of the mark to be detected.
Only then is it possible to use a tangentially scanned wide mark mark as a reference mark.

Furthermore, by constructing the circuit arrangement as a digital component, a compact construction method is achieved, which has the advantage that the reference pulse can be generated with arbitrary precision. Furthermore, according to the invention, the output side of the mark scanning device is connected to the input side of the pulse shaping circuit device, and the scanning mark pulse is taken out from the output side of the pulse shaping circuit device, and the scanning mark pulse is opened depending on the beginning of the scanning mark pulse. Through the closed gate,
The counting pulses generated by the pulse generator are
a digital counter, the counting state of the first digital counter being controlled by the trailing edge of the scanning mark pulse at the end of the scanning mark pulse for reverse counting controlled by the next scanning mark pulse; transfer to a second digital counter, reduce the transferred value to half of the counting state, erase the contents of the first digital counter, and transfer the pulse generated from the pulse generator to the first digital counter at the start of the next scan mark pulse.
This problem is solved by counting with a digital counter, a second digital counter counting the same pulse in the opposite direction, and sending out a reference pulse from the output terminal when the second digital counter reaches a zero value. .

As a result, the generation of a reference pulse takes place in the case of a counting state of zero, which returns the comparator circuit to the fixed position of the counting state of zero.

According to another embodiment of the invention, the counter and the accumulator are operated with a binary code. Due to the binary coding, the division of the counting pulse into two is carried out particularly simply by shifting the stored value by one place.

Thanks to the invention, for the first time in balancing technology, a unique reference pulse free of interference pulses can be generated, independent of the width and arrangement of the mark to be detected and the position of the scanning device with respect to the mark, and independent of the type of optoelectronic or electromagnetic scanning device. It is possible for this to occur.

Next, the present invention will be explained in detail using the illustrated embodiments.

As shown in FIG.
The scanning mark 3 is mounted on this rotating body.
is attached. This scanning mark 3 is, for example, a reflective strip or a mark with magnetic properties. This mark 3 is scanned by a device comprising a lamp 4 and a photocell 5 in this embodiment.
The device according to the invention can be used not only in the case of photoelectric scanning, but also in any scanning format.

An input stage 6 is downstream of the scanning device 4, 5;
In this input stage 6, the signals generated by the scanning device are amplified and matched to the subsequent circuit arrangement 7.
In this circuit arrangement 7, it is ensured that the generator pulses produced by the scanning devices 4, 5 and the input stage 6 are free of interference pulses. This necessarily results in a running mark pulse that is controlled depending on the maximum generated pulse. A precise square-wave voltage (U ₁ in FIG. 2) appears at the output 8 of the pulse-shaping circuit arrangement 7, and this square-wave voltage is supplied to a further circuit arrangement 101.

A monostable multivibrator 3 connected to the output 8 of the circuit arrangement 7 for controlling the circuit arrangement 101
3 is used. Monostable multivibrator 33
An inverting circuit 34, which is connected with the output of the flip-flop circuit 35, is likewise connected to the output 8 of the circuit arrangement 7.

A precise square wave voltage U ₁ (see FIG. 2) produced by circuit arrangement 7 is supplied to monostable multivibrator 33 . At the end of each pulse of voltage U ₁ a pulse (U ₂ in FIG. 2) occurs at the output of monostable multivibrator 33. A repetitive pulse occurs at the output of the flip-flop 35, the beginning of which is when the pulse produced by the monostable multivibrator 33 ends, and the end of which is when the pulse produced by the circuit arrangement 7 ends. This is when it began. This pulse train is designated U ₃ in FIG. These pulse trains U ₂ and U ₃ are correspondingly supplied to the control inputs of digital counters 67, 68, 74, which will be described below, in circuit arrangement 101.

FIG. 3 shows an embodiment of this circuit device 101.
This circuit arrangement is equipped with a pulse generator 65, which sends pulses via a gate 66 to a digital counter 67 (see FIG. 3). Digital counter 67 preferably operates with a binary code. The gate 66 is opened at the beginning of the pulse U ₁ produced by the pulse shaping circuit 7 described above and closed at its end. Furthermore, the pulses generated by the circuit arrangement 7 cause a monostable multivibrator 33 and an inverter 34 to be activated.
and the flip-flop 35 operated thereby.
is activated. The operation of flip-flop 35 has already been explained with reference to FIG. A first pulse U ₁ generated by circuit arrangement 7
At the end of the period, the counter state of the digital counter 67 is transferred to the downstream digital accumulator 68 under the control of the pulse U ₂ from the units 33, 34, 35, and is then halved by shifting by one digit. will be reduced to The contents of digital counter 67 are erased under the control of pulse U ₃ and the contents of digital accumulator 68 are fed to comparator 69 . Furthermore, the contents of the digital counter 67 caused by the next pulse generated by the circuit arrangement 7 are fed directly to a comparator 69 . The counter content increases linearly with time from the beginning of the pulse. If the content of counter 67 is exactly the same as the content of accumulator 68, a pulse is sent from comparison device 69 via AND gate 70 to output terminal 71 of this circuit arrangement. As a result, on the output side of this circuit device,
A pulse occurs at the center of the input pulse.

FIG. 4 shows a simplified device that operates similar to the circuit device 101 described using FIG. 3. This circuit arrangement also includes a pulse generator 65, a gate 66, a first digital counter 67, a monostable multivibrator 33, an inverter 34,
It consists of a flip-flop 35. The gate 66 and the units 33, 34, 35 likewise receive the pulses generated by the pulse shaping circuit arrangement 7 described above.
Controlled by U ₁ . A second digital counter 74 is connected downstream of the counter 67 and counts in the opposite direction. The number of pulses generated by the pulse generator 65 during the pulses generated by the circuit arrangement 7 is counted in a first digital counter 67. At the end of the first pulse, the contents of the first digital counter 67 change to the units 33, 34,
35 into the _second digital counter 74. The transferred value is then reduced by half by shifting by one place. Subsequently, the contents of the first counter 67 are erased under the control of the pulse _U3 . At the beginning of a new pulse generated by the circuit arrangement 7, the pulse generated by the pulse generator 65 is also transmitted to the first digital counter 6.
7, while the second digital counter 74 counts the same pulses in the opposite direction. Second
When the digital counter 74 reaches a zero value, a pulse is sent to the output terminal 7 of the circuit arrangement via an AND gate 75.
4.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a circuit device that generates an electrical reference pulse depending on the central position of the detection pulse, Fig. 2 is a waveform diagram showing the voltage progression of the circuit device of Fig. 1, and Fig. 3 is a digital counter and FIG. 4 is a circuit diagram of a circuit arrangement according to the invention for controlling the generation of an electrical reference pulse as a function of the center position of a scanning mark pulse using a digital accumulator; FIG. 2 shows a circuit diagram of an embodiment for controlling the generation of electrical pulses depending on the center position of the pulse; FIG. 4, 5...Mark scanning device, 7...Pulse shaping circuit device, 65...Pulse generator, 66...Gate, 67...First digital counter, 68...Digital accumulator, 69...Comparison stage , 74...second
Digital counter.

Claims (1)

[Scope of Claims] 1. In an electrical reference pulse generator for measuring the unbalanced angular position of a rotating body, the mark scanning device 4, 5 is connected to the input side of a pulse shaping circuit arrangement 7, so that the scanning mark pulses are taken out from the output side of the pulse shaping circuit arrangement 7, via a gate 66 which is opened at the beginning of the scanning mark pulse. The counting pulses generated by the pulse generator 65 are transferred to a digital counter 67.
and the counting state of the digital counter is stored in a digital accumulator 68 by control action by the trailing edge of the scanning mark pulse at the end of the scanning mark pulse.
The contents of the digital counter 67 are erased, and the comparison stage 69 compares the counted value depending on the next scanning mark pulse with a part of the accumulated value, and if they are equal, the reference value is determined. An electrical reference pulse generator characterized by generating pulses. 2. In an electrical reference pulse generator for measuring the unbalanced angular position of a rotating body, the output sides of the mark scanning devices 4 and 5 are pulsed. It is connected to the input side of the pulse shaping circuit arrangement 7 so that the scanning mark pulses are taken from the output side of the pulse shaping circuit arrangement, and are generated by the pulse generator 65 via a gate 66 which is opened at the beginning of the scanning mark pulse. The counted pulse is supplied to a first digital counter 67, and the counting state of the first digital counter is controlled by the trailing edge of the scanning mark pulse at the end of the scanning mark pulse and by the next scanning mark pulse. The data is transferred to a second counter 74 that performs controlled backward counting, the transferred value is reduced to half of the counting state, the contents of the first digital counter 67 are erased, and the pulse is started at the start of the next scanning mark pulse. The pulses generated from the generator 65 are counted by the first digital counter 67, and the second digital counter 74 counts the same pulses in the opposite direction, and when the second digital counter 74 reaches the zero value, the reference pulse is counted. An electrical reference pulse generator characterized in that the pulse is output from an output terminal 76.