JPS6144246B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an angle dividing device using a rotary encoder.

Rotary encoders are mainly used to detect rotation angles, and their output signals are logical codes (binary,
(absolute value type of BCD code and incremental type that outputs a pulse for each unit angle change), which can be used to digitally display angles, control the position of angle-detected objects, and control other equipment according to the angle of angle-detected objects. Demonstrates extremely high precision functions in the case of

When the rotary encoder is used to perform tasks other than digitally displaying angles, it is generally necessary to process the output signal of the rotary encoder using a very complicated mechanism, such as a computer. For example, even if the signal processing is relatively simple, such as dividing one rotation angle of 360° into 10° units and extracting the signals corresponding to each 10° to perform some kind of work, the processing software Clothing will become necessary.

Therefore, although it has a highly accurate detection function, it has a drawback that its usable range is limited.

The present invention has been made in view of the above circumstances, and uses a rotary encoder that detects the rotation angle of an angle-detected object and outputs a detection signal corresponding to the rotation angle in the form of a multi-bit logic code. In a device that obtains an angle detection signal for each rotation angle, there is a memory that uses a predetermined lower bit of the output of the rotary encoder as an address and reads data of a preset BCD code, and converts the read data of this memory into a decimal code. Out of the outputs of the plurality of BCD-decimal decoders and the rotary encoder, predetermined high-order bits are
The chip selector obtains the BCD code and converts the content into decimal, and selects one of the plurality of BCD-decimal decoders that are previously associated with each other according to the converted value. The BCD code value of up to 3 digits is stored while being stepped sequentially, and the chip selector selects the BCD-decimal decoder as the detection angle of the rotary encoder progresses. An angle division device for a rotary encoder that makes it possible to obtain a unique angle detection signal for each range in which the rotation angle of an angle-detected object is divided by a desired division value by appropriately selecting and combining the output terminals to be used. The purpose is to provide

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 is a diagram showing the configuration of this device.
Reference numeral 2 denotes an angle-detected body driven by a motor or a suitable prime mover, and 2 is a gear mechanism that transmits the rotation of the angle-detected body 1 to a rotary encoder 3. 4 is a programmable read-only memory (hereinafter referred to as P-ROM) for reading out the contents of the address stored in advance using the signal from the rotary encoder 3; 5 is a read-only memory for reading from this P-ROM 4; The signal and the output of the rotary encoder 3 are input,
This is a decoder that generates desired angle-divided signals from both signals.

The gear mechanism 2 rotates the angle detected object 1 by 1:
Assuming that the signal is transmitted to the rotary encoder 3 at a ratio of 1, and the angular resolution of the rotary encoder 3 is 1 degree, the output signal will be a 10-bit BCD code. In other words, the 10th place bit has a weight of 200,
9th place gets 100, 8th place gets 80, 7th place gets 40, 6th place gets 40.
20, 5th place 10, 4th place 8, 3rd place 4, 2
The digit represents 2 and the 1 digit represents 1, so the BCD 10-bit logic signal is “0” in decimal notation.
It will be possible to express numbers from to “399”,
For 0 to 359 degrees (one rotation), 10 bits of BCD is sufficient.

Therefore, the rotary encoder 3 is configured to output a 10-bit BCD signal, and the upper 2 bits are directly given to the decoder 5, and the lower 8 bits are given as an address to the P-ROM 4. Contents as shown in Figure 2 are stored in correspondence with each address. That is,
If one rotation of 360° is divided into 24 parts of 15°, the result will be as shown in Figure 2, and rounding up every 15° will be 3.
Store the numerical value of the bit configuration. Therefore, the decoder 5 receives a total of 5 signals, including this 3-bit readout signal and the upper 2-bit signal from the rotary encoder 3.
When a bit signal is input, the decoder 5 can output up to ²⁵ = 32 types of signals for 5 bits in binary representation, so in the case of 24 divisions, a 5-bit decoder will suffice.

FIG. 3 is a circuit diagram showing a specific configuration of the decoder 5, and 51, 52, 53, 54, and 55 are BCD-decimal decoders that convert BCD codes into decimal (decimal) codes, and input BCD codes. and the corresponding 10 from “0 to 9”
It converts it into a decimal number. This decoder 51~
One of the 55, 51, outputs the output signal of the rotary encoder 3 with a weight of 100 (9th bit) and a weight of 200 (10 In addition, since the C and D input terminals are not used, they are grounded. Decoder 5
2, 53, 54, 55 have the above-mentioned P at their input terminals A.
- Input each output D ₀ of ROM4,
In addition, the output _D1 of the P-ROM4 is inputted to the input terminal B, and the output _D2 of the P-ROM4 is inputted to the input terminal D. The decimal conversion output of the decoder 51 is “0” to the decoder 52, the decimal conversion output of the decoder 51 is “1” to the decoder 53, and the decimal conversion output of the decoder 51 is “2” to the decoder 54. The decimal conversion output "3" of the decoder 51 is input to the same 55 via an inverter INV.
Of the decimal conversion outputs of the decoder 52, the output of "0" is decoded to indicate a range from "0° to 14°", and the output of "1" is decoded to indicate a range from "15° to 29°". Similarly, outputs up to "5" are taken out. Furthermore, the decoder 52
Output of "6" among the decimal conversion outputs of the decoder 53 and output of "0" of the decimal conversion output of the decoder 53 are obtained via OR gate OR1.
The decode output indicates up to 105° to 119°, and the output of decoder 53 from 1 to 6 indicates 105° to 119°.
The decoder 53 outputs a decoded signal that indicates up to
The output obtained from the "7" output of the decoder 54 and the "0" output of the decoder 54 through the OR gate OR2 is used as a decoded output indicating "195° to 209°", and
The outputs from "1" to "6" of the decoder 54 and the outputs from "0" to "3" from the decoder 55 are obtained as decoded outputs from "210°" to "359°" in 15° increments. It is structured as follows. That is, decoders 52 and 55 are configured to become active when the most significant digit of the BCD code (input to input terminal D) is "0" and output a decimal code output, and decoder 51 is configured to output a decimal code output. It has the function of a chip selector.

Next, the operation of this apparatus having the above configuration will be explained. For example, if the rotational position of the angle-detected object 1 is at a certain position, and the output logic signal of the rotary encoder 3 at this time is "1010001000", the lower 8 bits are "10100010", and these 8 bits are P - Input to ROM4 as an address signal. Looking at Figure 2, this address corresponds to "45°", and since the address "10100010" stores the numerical value "110", P-
The ROM 4 reads this "110" and provides the decoder 5 with this 3-bit signal "110". That is,
P-ROM4 has “1” on its data output terminal _D0 ,
Output “ ₁ ” to D1 and “0” to _D2 , and
BCD-decimal decoder 52, 53, 54, 5
5 input terminal.

On the other hand, the upper two bits (bits with weights 100 and 200) of the output of the encoder 3 are input to the decoder 51;
Since 200 (10th bit) is “0”, BCD
Since the code "00" is a decimal "0", a signal is output from the output terminal "0" of the decoder 51. This signal is inverted by the inverter INV and applied to the input terminal D as the most significant BCD input signal of the decoder 52. As mentioned above, the lower three bits of BCD input to the decoder 52 are "1" at input terminal A (output of _D0 ), "1" at input terminal B (output of _D1 ), and "1" at input terminal C. 0" (output of D ₂ ) is applied, the BCD code is "1100". Therefore, as can be seen from the BCD decimal conversion truth table (Figure 4), the decoder 52 converts this to the decimal code "3". (i.e. “1100”=
“(2゜×1)+(2 ¹ ×1)+(2 ² ×0)+(2 ³ ×0)
”＝
1+2+0+0=3) and outputs a signal to the output terminal "3" corresponding to the decimal code "3". Since the decoders 53 and 55 receive the inverted output "1" of the output terminals "1", "2", and "3" of the decoder 51, they are inactive.
No output appears on that output terminal. Therefore, since a signal is output only from the output terminal "3" of the decoder 52, from this output, which corresponds to an angle of 45° to 59°, the object 1 to be detected at an angle is now detected at an angle of 45° to 59°. The angular position can be detected. Note that the decoder 52 is selected between 0° and 99° by the chip selector that converts the upper 2 bits of the encoder 3 into a decimal code, the decoder 53 is selected between 100° and 199°, and the decoder 54 is selected between 100° and 199°.
200° to 299°, 55 is active from 300° to 359° (input to terminal D is “0”), and output terminals can be changed in 15° increments to output signals. At that time, 90
Angular ranges that span two decoders, such as 195° to 209° and 195° to 209°, can be combined into one terminal by passing through an OR gate.

In this way, the signal for the lower 8 bits of the rotary encoder is used as an address, the entire address range that can be expressed with these 8 bits is divided into the desired number of divisions, and a 3-bit binary number is sequentially written into the loop of each divided address. The table obtained by giving P-
The chip selector is composed of a decoder that stores in the ROM and converts the upper 2 bits output from the rotary encoder into a decimal code, and also uses four BCD code/decimal conversion type decoders to convert these four decoders into decimal codes. The selection is made using the chip selector, and since the output of the P-ROM is input to these decoders and converted into decimal, the output terminal of the four decoders to be used is selected and each One rotation is 24 by simply weighting the
A divided signal can be obtained. In addition, it is not limited to 24 divisions, but can also be performed repeatedly such as 5° → 7° → 5° → 7°, or random angle range divisions such as 20° → 8° → 9° → 15°. In this case, a wide range of angular divisions is possible by changing the contents of the P-ROM table (changing the address and the data stored at that address) and selecting a combination of decoders.

As described above, the present invention provides an angle dividing device for a rotary encoder that has excellent features such as being able to arbitrarily divide one revolution and extracting detection signals with a simple configuration and not requiring a computer. be able to.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the configuration of the device of the present invention;
The figure shows a table showing data stored in the P-ROM, FIG. 3 shows a specific circuit example of this device, and FIG. 4 is a truth table showing the operation of the BCD-decimal decoder in the configuration shown in FIG. 1...Angle-detected object, 3...Rotary encoder, 4...Read-only memory, 5...Decoder, 5
1,...,55...BCD-decimal decoder, INV...
Inverter, OR1, OR2...OR circuit.

Claims (1)

[Claims] 1. In the method of obtaining a different angle detection signal for each desired rotation angle using a rotary encoder that detects the rotation angle of the angle-detected object and outputs a detection signal corresponding to the rotation angle in a multi-bit logical code, the above-mentioned A memory that uses a predetermined lower bit of the output of the rotary encoder as an address and reads data of a preset BCD code, a plurality of BCD-decimal decoders that convert the read data of this memory into a decimal code, and the rotary encoder. a chip selector that obtains a predetermined upper bit of the output as a BCD code, converts the content into decimal code, and selects one of the plurality of BCD-decimal decoders that are previously associated with each other according to the converted value; The BCD code value is stored in the memory while being incremented sequentially for each angle range to be divided, and the chip selector selects the BCD-decimal decoder as the detection angle of the rotary encoder progresses. An angle dividing device capable of obtaining an angle detection signal in which a rotation angle is divided by a desired division value by appropriately selecting output terminals used by a decimal decoder.