JPS5912561Y2 - unit length pulse converter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a unit length pulse converter, and more specifically, a unit length pulse converter capable of converting a digital output pulse train of a rotary encoder into a pulse train having a unit length weight of 10 m or 1 mm per pulse. Regarding pulse converters.

The well-known rotary encoder, as shown in a simplified example in FIG. The light is transmitted to the slit plate d, and the brightness of the moiré fringes generated by the rotating slit plate d and fixed slit plate e due to the rotation of the rotating slit plate d is received by the light emitting element f set between both slit plates d and e. After photoelectric conversion is performed by element g and amplified by amplifier h, a pulse generator i is driven to generate a digital output pulse train P.

That is, it is a device that converts the amount of displacement of the object to be measured a into a digital amount and detects it.

In this case, the relationship between the displacement amount of the measured object a and the digital pulse train generated by the rotary encoder is 1 because the displacement amount of the measured object a is converted into a rotation angle by the rotating drum b.
The amount of displacement of the measured object a per pulse becomes a band decimal value.

That is, the amount of displacement per pulse does not take an integer value such as lcm, but becomes the sum of the integer part and the decimal part.

Furthermore, even if the entire system can be initially set so that the amount of displacement per pulse is an integer value, the radius of the rotating drum b will change due to wear etc., so in the end, the amount of displacement per pulse will always be It is difficult to maintain the amount of displacement at an integer value.

Therefore, when a digital counter is associated with a rotary encoder and the amount of displacement of the object to be measured a is measured by counting the number of digital output pulses of the rotary encoder, or when a control counter is associated with a rotary encoder and the amount of displacement of the object to be measured a is measured by counting the number of digital output pulses of the rotary encoder, The digital pulse train counted by the counter as described above has a value of a fractional decimal number per pulse in the field of controlling the transfer of shaped bodies and controlling the conveyance or positioning of workpieces in the field of machine tools. Therefore, since it is an odd value, it is not easy to measure the displacement 1 or set the control amount, and the correction thereof is also a very labor-intensive task.

The present invention has been developed in view of the above-mentioned points, and its purpose is to detect the displacement of a measured or controlled object by converting it into a digital quantity using a rotary encoder. It is possible to convert a digital output pulse train of a rotary encoder having a characteristic of a band decimal value per pulse into a pulse train having an integer value such as lcm per pulse, that is, a weight of unit length, and thereby The object of the present invention is to simplify the grasping of the displacement amount of the measuring object and the setting of the controlled amount of the controlled object, and also to facilitate the correction thereof.

Next, the basic idea of the present invention for achieving the above object will be explained with reference to FIG. 1. 1 is a rotary encoder, 2 is an input for the output of the rotary encoder 1 and the output of the start-stop flip-flop FF1. A pulse gate 3 inputs the output of the pulse gate 2, and a measurement gate inputs the output of the measurement side M of the test/measurement flip-flop FF2; 4 inputs the output of the measurement gate 3, and , sum output S from the binary full adder 5 side
5 is a parallel output shift register in which O is the data input and the output of the reset side R of the initial reset flip-flop FF3 is input; 5 is the shift register 4 mentioned above;
A binary full adder which receives as input the summand B which is the shift output of , and also receives as input the addend A obtained by binary coding the set addend K set in the addend setter 6 by the binary converter 7. , 8 is a carry output CO with a weight of the set carry number Y of the full adder 5... In other words, a unit that receives the unit length pulse P1 as an input and also receives the output of the measurement gate 3 as an input. A long pulse gate, 9 is a unit length pulse detection terminal, 10 is an OR gate that receives the output of the unit length pulse gate 8, and 11 receives the output of the OR gate NO as an input, as well as the above-mentioned initial reset flip-flop. This is a decimal counter that receives the reset side R output of FF3 as an input.

In this case, when the output pulse P of the rotary encoder 1 is clocked into the shift register 4 via the pulse gate 2 and the measurement gate 3, the sum number SO stored in the shift register 4 is changed to the full adder 5. At the same time, the set addend K set in the addend setter 6 is inputted as the addend B to the full adder 5 as the addend A after being binarized by the binary converter 7. It is calculated by the full adder 5, and if the sum of the augend B and the addend A is larger than the value of Y, which is the set carry number, the carry output CO
is generated, and the remainder is input into the shift register 4 as data and stored as sum number SO, and this is repeated for each clock pulse thereafter.What is important here is that in order to achieve the purpose mentioned above, In the present invention, the set carry number Y to generate the carry output CO having the weight of the set carry number Y of the full adder 5, and the set addend K set in the addition setter 6. The mutual relationship between is set to satisfy the relational expression.

However, X is the pulse P transmitted from the rotary encoder 1 corresponding to the displacement of the measured object in unit length (for example, lcm).
is the number of

That is, it is the number of pulses P transmitted from the rotary encoder 1 per unit length of the object to be measured.

The set addend K applied to the full adder 5 for each clock pulse therefore means the addend per pulse of the train of pulses P of the rotary encoder 1.

In this case, the carry output CO sent from the full adder 5 can be made into a train of pulses P1 having a unit length weight such as lcrn per pulse.

That is, in the case where the displacement amount of the object to be measured or the object to be controlled is converted into a digital amount and detected by the rotary encoder 1, a sequence of digital output pulses P having a characteristic of a band decimal value per pulse of the rotary encoder 1 is used. of,
It can be converted into a train of pulses P1 having a weight of integer value such as lcm per pulse, ie unit length.

In order to clarify this point, we will raise one specific value and show the operation development diagram in Figure 2 based on it.
We will explain two specific operations.

Now assume that X=1.28 pulses and Y=1024.

That is, assume that when the object to be measured is displaced by 50 m, the number of pulses P output from the rotary encoder 1 is 6400.

Then, the number of pulses X transmitted by the rotary encoder 1 corresponding to the displacement amount of lcm (unit length) of the object to be measured is as follows.

Therefore, since the carry number Y that produces the carry output CO determined according to the characteristics of the full adder 5 is 1024, the above
Using Eq.

That is, the set addend K=800 is set in the addend setter 6.

Under these settings, in order to measure the displacement of the object to be measured,
Start/stop flip-flop FFI. Trial measurement/measurement Operate flip-flop FF2 and pulse gate 2
Then, the measurement gate 3 is opened, and the shift register 4 is brought to an initial state by the initial reset flip-flop FF3.

A digital pulse train is output from the rotary encoder 1 according to the displacement of the object to be measured, but now the first pulse P
Suppose that is input to the shift register 4 with the pulse gate 2 and measurement gate 3 as diameters.

Since the memory of the shift register 4 is 0, the summand B shifted to the full adder 5 by the above clock input is O.
It is.

Therefore, only the addend A of 800 is input to the full adder 5.

The sum number SO, ie, 800, is immediately calculated and inputted into the shift register 4.

At this point, the number of carries does not exceed 1024, so no carry output CO is generated.

Next, when the next pulse P is input to the shift register 4, the sum number SO 800 stored in the shift register 4 is added to the full adder 5 as the summand B by the clock input, and at the same time Addend A of 800 is input to full adder 5.

Since it is calculated immediately and the value is 1600, which exceeds the carry number 1024, the carry output CO is output from the full adder 5, and the remainder SO, 576, is input to the shift register 4. Ru.

If this operation is repeated as shown in the second figure, and now 128 pulses of the output pulses P of the rotary encoder 1 have entered the shift register 4, the full adder 5 has 128 x 8 pulses.
The numerical value of 00 = 102400 is input, 10240
Since the value of 0 is 1024 x 100+O, this means that 1024 carry outputs CO have been output 100 times.

1 of the pulses P immediately transmitted from the rotary encoder 1
Unit length pulse P whose 28 pulses are carry output CO
It is converted into 100 pulses of 1, which is passed through a unit length pulse gate 8 and an OR gate 10 to a decimal counter 11.
This means that it was measured by

The pulse P transmitted from the rotary encoder 1 is
For the displacement amount of lcm of the measured object, displacement amount 1 cm = 1
．． Since there is a relationship of 28 pulses, the 128 pulses correspond to a displacement of 100 cm.

On the other hand, since the unit length pulse P1 measured by the decimal force counter 11 is 100 as described above, P1 has a weight of lcm per pulse.

That is, it is a unit length pulse with only integer values.

The pulse P transmitted from the rotary encoder 1 has a relationship of 1 cm = 1.28 pulses, and the displacement amount per pulse is P = 0.781 cm, which is the sum of the integer part and the decimal part,
In other words, it becomes a mixed decimal value, which requires extremely complicated work when grasping the amount of displacement of the object to be measured or setting the amount of control of the object to be controlled, and it is not easy to correct it, but in the case of the present invention. , the train of pulses P of the rotary encoder 1 can be converted into a train of pulses P1 having a weight of unit length such as lcm per pulse, and the integrated value of the P1 pulses directly indicates the amount of displacement of the object to be measured. Therefore, it becomes extremely easy to grasp the amount of displacement of the object to be measured and to set and correct the amount of control of the object to be controlled.

In the above example, if the count value of pulse P1 of decimal counter 11 is 100,000 pulses, the measured object is lkm
You can directly read the displacement.

There is no need for complicated work such as using a conversion table.

If necessary, as shown in FIG. 1, a test gate 12 is provided which receives the output of the pulse gate 2 and receives the output of the test side T of the test/measurement flip-flop FF2. If the output of the test gate 12 is input to the OR game 10, the above-mentioned X can be determined as necessary.

That is, the operation of the test/measuring flip-flop FF2 is reversed, the measurement gate 3 is closed, the test measurement gate 12 is opened, and the number of output pulses of the rotary encoder 1 corresponding to the amount of displacement of the object to be measured is stored in the decimal counter 11. Read it.

Thereby, the number of pulses X of the rotary encoder 1 corresponding to the amount of displacement of the measured object in unit length (for example, lcm) is determined.

By calculating this X, the set addend K to be set in the addend setter 6 that satisfies the above formula
Set it to .

By mediating such work, the present invention can be optimally adapted to the measurement situation and control situation.

Also, as described above, the operation of the test/measurement flip-flop FF2 is reversed, the measurement gate 3 is closed, and the test measurement gate 12 is closed.
open, count the number of output pulses of the rotary encoder 1 per predetermined constant displacement amount of the object to be measured with a decimal counter, and store the counted value as the above predetermined constant displacement amount. X
If you automatically calculate the addend K to be set in the addend setter 6, and then automatically shift the addend K to the addend setter 6, the above-mentioned result can be achieved. Similar to the method of using the present invention described above, the present invention can be optimally adapted to the measurement situation and control situation.

As detailed above, according to the present invention, when the displacement amount of a measured object or the controlled displacement amount of a controlled object is converted into a digital amount by a rotary encoder and detected, the characteristics of the pulses of the rotary encoder are , even if the amount of displacement per pulse is expressed as a decimal value, it can be converted to an integer value such as lcm per pulse, that is, a pulse train with a weight of unit length, so it is possible to digitally grasp the amount of displacement of the object to be measured. , it is possible to simplify the setting of the digital control amount of the controlled object, and it also brings about the advantage that the correction thereof is also easy.

Next, a specific example of the basic idea shown in FIG. 1 is disclosed in FIG.

In this example, the pulse gate 2 is a NAND circuit, the measurement gate 3 is an AND circuit, and the shift register 4 is a D-F
A 10-bit parallel human-powered one-parallel output shift register consisting of FXIO is used.

The above-mentioned 10-bit parallel output shift register is connected to an AND circuit, that is, a measurement gate 3, via an inverter I, and symbol T is a clock into which the pulse P of the rotary encoder 1 is input.R is an initial reset flip-flop. A reset input receives the reset output of the FF3, D represents a data input into which the sum output SO of the full adder 5 is input, and Q represents a shift output that becomes the summand B to the full adder 5.

Next, three 4-bit binary full adders were constructed in parallel as full adder 5, and the unnecessary manpower and addend input were closed to create a 10-bit pure binary parallel adder as a whole. The symbol B is the digit input, A is the addend input, SO is the sum output, and the lowest carry output is CO4.
becomes the next carry power C1, and the highest carry output C
O4 becomes the unit length pulse P1.

In this example, a BCD code digital switch is used as the addend setter 6, and the set addend K set there is used.
is converted into a binary code by a binary conversion converter 7 represented by a BCD pure binary converter, and becomes the above-mentioned addend power A.

Now, a NAND circuit is used as the unit length pulse gate 8, and a unit length pulse detection terminal 9 is connected through the inverter I.

A NOR circuit is used as the OR gate 10, and TA in the decimal counter 11 that counts the unit length pulse P1 which is the output of the OR gate 10 is a count input;
R is manual reset, A, B, C, D are count outputs (B
CD code), and the count number is output at the falling edge of the count input.

The above BCD code is BCD-7 segment converter 13
With human power, the 7-segment light emitting diode 14 is driven and the count is displayed numerically.

In addition, start/stop flip-flop FFI, test measurement,
The measurement flip-flop FF2 and the initial reset flip-flop FF3 use two NAND gates, and an example is shown in which a normal R-S flip-flop is used in which the output of each gate is positively fed back to the input.

And a test measurement gate 12 which inputs the output of the pulse gate.
The related figures are shown using an AND circuit.

The output becomes the input for the OR game}10.

[Brief explanation of drawings]

In the accompanying drawings, FIG. 1 is a block diagram showing a certain unit length pulse converter according to the present invention, and FIG. 2 is an operation example for explaining an example of the operation of converting digital pulses of the rotary encoder 1 into unit length pulses. 3 is a logic circuit diagram showing a specific example of the unit length pulse converter shown in FIG. 1, and FIG. 4 is an example for explaining the pulse characteristics of the digital output pulse train of a rotary encoder. It is a diagram.

Claims (1)

[Claims for Utility Model Registration] When detecting the amount of displacement of an object to be measured or the amount of controlled displacement of an object to be controlled by converting it into a digital amount by the rotary encoder 1, the digital output pulse P of the rotary encoder 1 and the sum output SO of the full adder 5,
and a shift register 4 which receives as input the reset output of the initial reset flip-flop FF3, and sets the shift output of the shift register 4 as the addend B, and sets the set addend in the addend setter 6. It is equipped with a full adder 5 which inputs an addend A obtained by binary converting K by a binary converter 7,
Carry output 0 with weight of set carry number Y of full adder 5
The above set carry number Y to generate 0 and the above addend setter 6
The correlation between the set addend K and the set addend K is as follows: where X = the number of pulses P emitted from the rotary encoder 1 corresponding to the displacement amount of the unit length of the object to be measured. By inputting the sequence of digital output pulses P of the rotary encoder 1, which has the characteristic of a band decimal value per pulse, to the shift register 4, the carry of the full adder 5 is A unit length pulse converter whose output CO is a pulse P1 having a unit length weight per pulse.