JPH0244372B2 - SEITEN * GYAKUTENHANBETSUKINOTSUKIKURANKUKAKUDOKEI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a press apparatus, and more particularly to a crank angle meter that displays the rotation angle of a crank.

Prior Art Conventionally, press equipment has been equipped with a crank angle meter, so that it is possible to know at what point the press has stopped. As shown in FIG. 1, this conventional crank angle meter simply displays the angle using a needle that rotates in synchronization with the crank.
Like a clock, there is a scale around the tip of the hand, allowing you to see how many times it has rotated.

Even with the above-mentioned conventional method, it is possible to know the value of the angle. However, when the press device stops, it is impossible to know whether the press device came from the forward rotation direction and stopped, or whether the press device stopped while rotating in the reverse direction. Therefore, I don't know whether it will move forward or backward next time. Not knowing which direction to move next is dangerous.

OBJECTS OF THE INVENTION The present invention has been made in consideration of the above points, and an object of the present invention is to provide a crank angle meter that can easily detect forward and reverse rotation.

SUMMARY OF THE INVENTION According to the present invention, light emitting elements such as light emitting diodes are arranged in a predetermined order and turned on according to the rotation angle. One light emitting element corresponds to one degree. It is most accurate to arrange 360 pieces in a circle, one at a time, but due to cost etc., it is possible to prepare 36 pieces, make each one correspond to an angle of 10 degrees, and arrange the circles at the position of each angle. desirable. An encoder is attached to a rotating shaft that rotates in synchronization with the crank angle, and the light emitting elements are sequentially turned on by the output of the encoder. An absolute encoder is used as the encoder, and its BCD output is 10
It is decoded into decimals and output every 10 degrees by a counting circuit, and the output lights up the corresponding light emitting element.

The least significant digit output of the above absolute encoder is used to determine whether the rotation is forward or reverse.
degree or from 10 degrees to 20 degrees and 30 degrees, and when the reverse occurs, the above lights are turned off once and the lights are turned on in the opposite direction from 360 degrees to 350 degrees, 340 degrees, and 330 degrees. It is configured as follows.

Therefore, the press operator can determine the rotation angle based on how far the light-emitting element is illuminated, and at the same time, depending on which direction the light is illuminated, the press operator can stop when rotating in the forward or reverse direction. It is very easy to know what has happened.

Embodiment FIG. 1 shows an embodiment of the display board of the present invention, in which 36 light emitting diodes 2, 2, . . . are arranged in a circle at equal intervals on a surface body 1. Each light emitting diode 2,2
...corresponds to the angle of the placed position, that is, each angle in increments of 10 degrees.

The circuit shown in FIG. 4 lights up this light emitting diode, and the output of the absolute encoder 3 is decoded for each digit by B/D conversion circuits 4, 5, and 6 to produce a decimal output. B/D conversion circuit 4
is the least significant digit, that is, one digit, 0,
Four outputs, 2, 5, and 8, are taken out as outputs and are input to a forward/reverse determination circuit 7, which will be described later. The B/D conversion circuit 5 is the second digit and outputs 10 outputs from 0 to 9, each of which is connected to one input of the OR gate 8. These 36 OR gates are provided corresponding to each light emitting diode from 0 degrees to 350 degrees.
The B/D conversion circuit 6 is the third digit and outputs three outputs 1 to 3. The 36 OR gates 8 are divided into four blocks, the first block receives the outputs 0 to 9 of the B/D conversion circuit 5 as inputs, and the second block receives the outputs of the B/D conversion circuit 6. 1 output and each output of 0 to 9 of the B/D conversion circuit 5.
Perform AND with AND gates 9, 9... and start from 100 degrees
Compatible with angles up to 190 degrees. Although the others are not shown, an AND gate is similarly provided, and the B/D conversion circuit 6
With the two outputs of and each output of the B/D conversion circuit 5,
From 200 degrees to 290 degrees and by the 3 outputs of the B/D conversion circuit 6 and each output of 0 to 5 of the B/D conversion circuit 5.
It is compatible with temperatures from 300 degrees to 350 degrees. 360 degrees is the same as 0 degrees, and whether it comes first or last is simply a matter of design.

As shown in the figure, the output of each OR gate 8 is connected to the corresponding Exclusive OR gate 10, 10, . . . and also to the input of the previous OR gate. Each exclusive OR gate 10 is connected to a light emitting diode 2 via a converter 11. The Exclusive OR10, 10, . . . circuit constitutes an inverting circuit.

Next is the forward/reverse determination circuit, which is shown in FIG. It is composed of two flip-flops 12 and 13 and two AND gates 14 and 15. As mentioned above, the lowest digits 0, 2, 5, and 8 are inputted from the absolute encoder 3 to this circuit via the B/D conversion circuit 4. 2, 8, 0, and 5 in FIG. 3 mean the numerical values. Flip-flop inputs 0 and 5,
The output is used as one input of AND gates 14 and 15. 2 is input to the AND gate 14,
8 is input to the AND gate 15. and,
The outputs of AND gates 14 and 15 are connected to respective inputs of flip-flop 13. Flip-flop 13 is an RS flip-flop,
AND gate 14 is connected to R, and AND gate 15 is connected to S. The output of the flip-flop 13 is used as the output of the forward/reverse determination circuit 7.

To explain the operation of the above embodiment, first, the forward/reverse determination circuit 7 will be explained. In this embodiment, 0 is set as the origin. The crank rotates and 10
When cutting through 0 every time, the signal is input to 0 in FIG. 3, and the output of the flip-flop 12 is set to H level. Gates 14 and 15 are therefore opened. In the case of forward rotation, 2 is output first. Since gate 14 is open, the signal is input to R of flip-flop 13, and the output of flip-flop 13 becomes L level. On the other hand, in the case of reversal, since 8 comes after 0, it is input to S of the flip-flop 13 in the opposite direction to the previous one, so that the output of the forward/reverse determining circuit 7 becomes H level. After any of the outputs is output as described above, the flip-flop 12 is reset by inputting 5. In this way, the L level for forward rotation and the H level for reverse rotation are output from the forward/reverse determination circuit 7.
Input to Exclusive OR10, 10...

Assume that the rotation is now normal. Therefore, all
The L level is input to the exclusive OR10. When rotated up to 10 degrees, 1 of B/D conversion circuit 5
is output and passed through 10 degree OR gate 8.
An H level signal is input to the other terminal of the Exclusive OR 10, and its output becomes H level. Therefore, the 10 degree light emitting diode 2 is turned on via the inverter 11. At that time, the output of OR gate 8 is input to the previous OR gate, so
0 degree light emitting diode 2 connected to OR gate
is also lit. Thereafter, as the crank rotates, the light emitting diodes 2, 2, . . . turn on in sequence. Turn off all the lights once at 360 degrees, that is, 0 degrees, and then operate in the same way again.

Therefore, for example, if it stops at about 195 degrees, the light emitting diodes 2, 2, etc. arranged as shown in Figure 2 will remain lit from 0 degrees to 190 degrees, so when rotating forward You can immediately tell that it has stopped.

Next, let's assume that the vehicle is reversed from when it stopped, as described above. When it returns to 190 degrees, 0 is input to the flip-flop 12 of the forward/reverse determination circuit 7, and then 8 is output, so the flip-flop 13 is set and its output becomes H level. Since this is input to all Exclusive ORs 10, the output from 0 degrees to 190 degrees, which had been at H level, becomes L level, and conversely, from 200 degrees to 350 degrees, becomes H level. Therefore, in Figure 2, the lights go out from 0 degrees to 190 degrees, and the lights go out at 350 degrees.
Lights up from 200 degrees to 200 degrees. If the crank continues to rotate in reverse, the encoder is an absolute encoder, so the light emitting diodes 2, 2, . . . continue to light up as the output gradually disappears. Even if the motor is stopped at an arbitrary point, by looking at the light emitting diodes on the display panel shown in FIG. 2, one can immediately know that the motor has stopped at a reverse rotation.

Effects of the Invention As described above, according to the present invention, it is possible to very easily know whether the rotation is normal or reverse based on the lighting state of the light emitting element.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional crank angle meter, Figure 2 is a front view of a conventional crank angle meter.
3 is a circuit diagram of a forward/reverse determination circuit, and FIG. 4 is a circuit diagram of an embodiment of the present invention. 1: Surface body, 2: Light emitting diode, 3: Absolute encoder, 4, 5, 6: B/D conversion circuit, 7: Forward/reverse determination circuit, 8: OR gate, 10:
Exclusive OR.

Claims (1)

[Claims] 1. An absolute encoder attached to a rotating shaft that rotates in synchronization with a crank; a forward/reverse discrimination circuit that determines forward/reverse rotation based on the output of the least significant digit of this encoder; and an absolute encoder. a counting circuit that outputs an output of 1 for each predetermined frequency; a light emitting element that sequentially lights up one corresponding to each frequency based on the output of the counting circuit; a display board that arranges the light emitting elements in a predetermined order; When connected to a discrimination circuit and its output is forward rotation, the light emitting elements corresponding to the smaller number of degrees are lit up to the light emitting elements corresponding to the larger number of degrees, and when the output of the forward/reverse discrimination circuit is reversed, the light emitting elements corresponding to the lower number of degrees A crank angle meter characterized by having an inversion circuit that turns off the light-emitting elements corresponding to the highest power and turns on the light-emitting elements corresponding to the lowest power in order from the light-emitting element corresponding to the largest power. . 2. The crank angle meter according to claim 1, wherein the output of the counting circuit is every 10 degrees. 3. The crank according to claim 2, wherein the display plate has 36 light emitting elements corresponding to each angle of 10 degrees arranged in a circular shape, and each light emitting element is arranged at a position corresponding to the angle. Degree Ruler.