JPS6019458B2 - Rotary dial rotation identification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a rotary dial device that detects the rotation direction and rotation angle using photoelectric elements.

Projecting two light beams onto a rotating shaft rotated by a dial,
There is a known device that includes a mechanism that intermits the light beam with a different phase as the rotation axis rotates, and detects the intermittent signal of the light beam to identify the rotation direction and rotation angle of the rotation axis. .

FIG. 1 is a structural perspective view showing an example of its mechanical parts.
A gear 2 is attached to a rotating shaft 1, and a spring-like spring piece 3 is in contact with the circumference of the gear, and in this example, a click stop is configured to operate every time the gear rotates 30 degrees. The disk 4 is used to interrupt the light beam, and is configured to interrupt the light beam from the light emitting diode D to the phototransistor P, or the light beam from the light emitting diode D2 to the phototransistor P2, every 15 degrees of rotation angle. . With such a mechanism, by detecting the signals of the phototransistors P and P2, the direction of rotation of the disk 4 is detected, and by counting up or down the number of intermittent light beams, it corresponds to the rotation of the dial. Digital information can be obtained.

Conventional devices with this type of configuration often use the data processing device of the device to which this dial is attached to count the number of intermittent light beams, but in the case of devices that manually rotate axis 1 of the dial, In any case, the method in which the rattan 1 is rotated at high speed using a gear requires considerably high-speed processing to count the number of intermittent light beams, which has the drawback of increasing the burden on the data processing device.

Also, when the rotation of the axis stops, it is good if it stops at the correct click position after rotation in the same direction.
If the bale piece 3 rides on the peak of the gear 2, rotates slightly in the opposite direction, and then stops, an error will occur in the identification of the rotation direction and in the count value. The present invention improves this, and provides a device with a hardware configuration that reduces the burden on a data processing device even during high-speed rotation, and does not cause malfunction even if there is a slight return or backlash in the rotation. With the goal.

The present invention provides a dial mechanism configured so that two light beams passing between two sets of photoelectric elements are interrupted mechanically with different phases as the dial rotates, and a dial rotation caused by the interruption of the light beams. In the device equipped with an electric circuit for identifying the direction and the rotation angle, the above-mentioned dial mechanism is configured such that the phase of the intermittent state is set so that the above-mentioned two light beams are simultaneously cut off and simultaneously covered. and the electric circuit includes: a first logic circuit that detects a state in which the two light beams are simultaneously disconnected; a second logic circuit that detects a state in which the two light beams are simultaneously in contact; a third logic circuit that includes an RS flip-flop controlled by the output signals of both the first and second logic circuits and detects when the output of the RS flip-flop changes; detecting the rotation angle by the output signal of the third logic circuit and two O-type flip-flops, each of which is guided to the input and the intermittent signal of the other beam and the inverted signal of the intermittent signal are respectively guided to the clock input; The above two O-type flips.

and means for detecting the direction of rotation based on each output of the chip and the output of one of the two sets of photoelectric elements. This will be explained in detail with reference to the drawings.

FIG. 2 is a configuration diagram of the main parts of the electric circuit of the device of the present invention.

Light emitting diodes D,, D2 and phototransistors P,
, P2 are light emitting diodes D, .
D2 and phototransistors P,, P2, which correspond to a certain rotation angle of dial axis 1 (15 degrees in this example)
The light rays are intermittent each time. The output of the phototransistor P is connected to the clock input of the NAND gate G, and the ○ type flip-flop F2, and the inverted output of the phototransistor P is connected to the NAND gate G2,
The clock inputs of the D-type flip-flop F, respectively. On the other hand, the output of phototransistor P2 is
The D inputs of NAND gates G, and D-type flip-flops F, . Nand Gate G, and G
The outputs of 2 are respectively given to the reset inputs of a set of RS flip-flops consisting of gate circuits G3 and G4.The outputs of these flip-flops are given to the inputs of exclusive OR circuit G5, one directly and the other. It is applied via a CR filter consisting of resistor R3 and capacitor C.

The output of this exclusive OR circuit is given as a count pulse CP to a data processing device (not shown). Further, the outputs P, Q2 of the phototransistor P, and the outputs Q, Q2 of the D-type flip-flops F, F2 are respectively given as direction signal pulses to a data processing device (not shown).
The operation of the device configured in this way will be explained.

FIG. 3 is an operation waveform diagram when the dial starts continuous rotation in the counterclockwise direction. The waveforms shown with symbols in FIG. 3 are the waveforms at points with corresponding symbols in the circuit shown in FIG. The wavy waveform in the upper part of FIG. 3 corresponds to the peaks and valleys of the gear 2 shown in FIG. 1, and the arrow indicates the click stop position. Therefore, when the dial is not rotating, it is stopped at this click stop position by the spring force. The output S of the NAND gate G, is the phototransistor P,
When the outputs of P2 and P2 are simultaneously "H", it becomes "LJ".

The output R of the NAND gate G2 becomes "L" when the outputs of the phototransistors P and P2 are simultaneously "L". When an RS flip-flop consisting of gate circuits G3 and C4 is controlled by these outputs S and R, an output F is obtained which is inverted in green before each fall of both outputs S and R. The gate circuit G5 acts as a kind of differentiating circuit and sends out a short pulse every time the output F is inverted. On the other hand, 2
For the D-type flip-flops F and F2,
The flip-flop F is configured to latch the state of the D input at the rising edge of the clock input CK, and the flip-flop F and F2 are configured to latch the state of the D input at the falling edge of the phototransistor P and the flip-flop F2, respectively, at the rising edge of the phototransistor P. The state of transistor P2 will be latched.

As a result, the outputs Q, , Q2 become "day, L", and it can be recognized that the dial shaft is rotating counterclockwise. It can be seen that when the dial axis is rotating clockwise, that is, when the time axis flows from right to left in FIG. 3, the outputs Q. and Q2 become "L, H". In such a device of the present invention, the count pulse CP is a simple short pulse, and the direction signal is Q,...
As shown in Q2, simple "日、LJ" or "L、H"
Therefore, it is possible to operate at considerably high speeds without placing a large burden on the data processing device.

Next, we will explain the situation when the dial rotation makes a complicated movement due to overshoot or backlash.

First, when I rotated counterclockwise, that is, advanced the time axis from left to right in Figure 3, and tried to stop at point A in the figure, it overshot once to point B, and I let go of it there. Let us consider the case of returning to the click stop position of point A again.

Until overshoot occurs, Q. , Q2 is “day,
L, but by moving from A to B to A, Q,
, Q2 becomes "day, h". If we move from this state of "day, H" to the left side of the diagram, that is, clockwise, and move from A to B to A to C, Q,, Q2 become "L, H" and are normal. There is no problem because the movement is as follows, but if it moves as A→B→A→D, Q,,Q2 will advance by one count in the state of "day, H".

This is the same when the time axis advances from right to left in FIG. 3 by first continuously rotating clockwise. To identify this, output Q. , Q2, it can be seen that it is sufficient to monitor the output P,.

In other words, when Q,,Q2 becomes "day, H", P
If , is "L", count counterclockwise, and if P, is "H", count clockwise, so that counting can be performed without malfunction. Next, rotate counterclockwise, that is, advance the time axis from left to right in Figure 3, and
Let us consider a case where an attempt is made to stop at a point, but the vehicle overshoots once to point E and then returns to point D.

In this case, contrary to the above situation, the outputs Q, , Q2 are
L, L”. Similarly, at this time, P. The direction can be correctly identified by monitoring the direction. That is, when Q,, Q2 are "L, L", if P, is "H", the rotation will be counterclockwise, and if P, is "L", the rotation will be clockwise. In this way, the D-type flip-flops F, . By monitoring the status of one phototransistor in addition to the output of F2 and Q2, it is possible to prevent complicated movements caused by overshoot or backlash of the dial that is less than half the click stop pitch. On the other hand, it is possible to obtain an excellent device that can completely identify the direction.

As described above, according to the present invention, the output pulse is simplified and the load on the data processing device is reduced even in high-speed rotation, and the device is excellent in that it does not malfunction even with complicated dial movements. can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a dial mechanism, and FIG. 2 is a circuit diagram of a main part of an apparatus according to an embodiment of the present invention. FIG. 3 is a waveform diagram for explaining the operation. Suzu 1 Diagram 2 Diagram Rough 3 Diagram

Claims (1)

[Scope of Claims] 1. A dial mechanism configured to intermittent two light beams passing between two sets of photoelectric elements with mechanically different phases as the dial rotates; In a device equipped with an electric circuit for identifying the rotation direction and rotation angle of the dial, the dial mechanism adjusts the phase of the disconnection so that the two light beams are simultaneously disconnected and simultaneously connected. is set, and the electric circuit includes a first logic circuit that detects a state in which the two light beams are simultaneously disconnected, and a second logic circuit that detects a state in which the two light beams are simultaneously connected. , a third logic circuit that includes an RS flip-flop controlled by the output signals of the first and second logic circuits and detects when the output of the RS flip-flop changes, and a third logic circuit that detects when the output of the RS flip-flop changes; The rotation angle is detected by the output signal of the third logic circuit and two D-type flip-flops, each of which has an intermittent signal of the other light beam and an inverted signal of the intermittent signal introduced into the clock input. 2
1. A rotation identification device for a rotary dial, comprising means for detecting the direction of rotation based on the outputs of the D-type flip-flops and the output of one of the two sets of photoelectric elements.