JPS601568A - Rotating direction detector - Google Patents

Abstract

PURPOSE:To detect the rotating direction easily and accurately by judging the rotating direction according to the results of edge detection of two phases of pulses corresponding to the rotation and the coincidence or noncoincidence of sampled values thereof. CONSTITUTION:Two phases of pulses corresponding to the rotation different in the phase such as 90 deg. outputted from a rotation detecting mechanism (a) are sampled in the level H and L at smaller time interval than the phase difference of both the pulses during the maximum rotation by a sampling means (b) and the current sampled values are compared with the previous ones respectively to detect edges of the two phases of pulses with an edge detection means (d). Based on the results of the detection and the results of the comparison to determine the coincidence of the current sampled values by a coincidence detection means (e), the judging means (f) determines the rotating direction of a rotor. Thus, the correct rotating direction can be judged even when the sampling cycle exceeds the quarter of the cycle of the pulses thereby making the setting of the sampling cycle so large as to enable the detection of the rotating direction easily and accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotational direction detection device, which obtains two pulse signals of the same period from a rotating body whose maximum rotational speeds differ depending on the rotational direction, and with a phase difference according to the ratio of both maximum rotational speeds. By comparing the ripple values of both pulse signals after detecting one pulse signal whose phase lags when rotating in the direction of rotation where the maximum rotational speed is high, the ripple period can be set larger than before. It is an object of the present invention to provide a rotation method detection device that requires less number of executions of a rotation direction detection program per unit time and makes effective use of a computer.

In general, the rotation speed and rotation direction of a rotating body that performs reversible rotation are measured as the most basic elements, and are used in conjunction with each other. For example, a pulse with a period corresponding to the rotation of the reel 61 is generated, and when the rotation direction of the reel stand is clockwise, the counter is used to turn the pulse down from 1 to 1, and the clock pulse is turned down from 1 to 1 in the counter direction. The tape counter in the evening is an example of that θ.

In order to detect the rotation speed and rotation direction of rotation 1, conventional
There are C (14) not shown in Figures 1 (Δ) and (B).

In the figure, there is a rotating shaft C' which is rotationally driven by the rotating body to be detected (1). A circular rotary plate 3 is fixed.Furthermore, light receiving elements J''11 and 5 are fixed to the frame 2 with their light receiving surfaces facing the rotating plate 3.The light receiving elements 4 and 5 are A1 (Δ)
They are located on approximately the same circumference at an angle of (J) OIre with the rotation axis 1 as the center. Rotating plate 3 in Fig. 1 ([3)
51. There is a light source on one side, and a light receiving element/I.
L) When the light from the E source enters 1-level,) is blocked by the rotating plate 3, it outputs an L level signal. The light receiving elements 4 and 5 are rotated in the direction (counterclockwise) by Φ11 as shown in FIG. 2(A) (
B) Outputs the pulse signal a, 11 as accepted, and arrow 1
:l] A When rotating in two directions (clockwise), the light receiving element '4.5 outputs pulse signals a and b as shown in FIGS. 3 (Δ) and (B), respectively.

Rotation detection according to FIGS. 1A and 1B is used internally, for example, in a tape recorder. For example, when the rotation of a take-up reel of a hoop recorder is transmitted to the rotating shaft 1, the rotating plate 3 rotates at a constant speed, for example, in the direction of arrow Δ1 during fast forwarding of the tape recorder. Further, during rewinding, it rotates in the direction of arrow A2, 1r7J, and its rotational speed changes depending on the tape winding diameter of the supply reel, reaching its maximum just before the end of rewinding. The maximum rotation speed in the direction of arrow Δ21j is rr3. in the direction of arrow A1. The speed will be approximately twice that of the high φ section speed.

By the way, the present applicant previously filed a letter on April 23, 1981.
A patent application (title of the invention: ``Rotation direction detection method and device'') was proposed. This is, for example, pulse signal 1 of two pulse signals a and b with the same period and different phases]
Focusing on this, immediately after the etch of the rising and falling edges of this pulse ftQl, (also before 1jli!i) M
1. The levels of the two pulse signals are compared with each other, and the direction of rotation of the rotating body J3 is detected and overruled, such as rotation in the direction of the arrow Δ2 when coincidence occurs, and rotation in the direction of the arrow when failure occurs. In other words, rotating body 3'! When is rotating in the direction of arrow △1, as shown in Fig. 2 (△) and (B), the level of the pulse signals r+ and l+ is the same just before the etch at the rise and fall of pulse b, and the etch Immediately after, it is different. In addition, as shown in FIG. 3 (△>, (B)), the platform rotating in the direction of arrow A2, pulse
There are 41 levels of pulse signals a and b in front of the blade IC1, and they are the same immediately after etching.

The opposite is also true for the edge of pulse 1 word a, and the rotational direction of the rotating body is detected according to the above principle b.
It is.

Rotation 1) How to detect direction? In order to perform tasks other than surface detection using the computer programmer 11 (when implemented, the computer rotates), the pulse
Routines for detecting rotational direction, such as human level rimbling and comparison of both Xanzols 1111, are executed intermittently at predetermined time intervals. Here C1 rotating body 3 is arrow A2
direction, and at times Ll, L2 . shown in FIGS. 3(A) and 3(B). '3+t, +, L5. t6. t7. js
There is no problem if sampling is performed at .... However, as the rotational speed of the rotating body 3 increases, the lean-bring interval becomes relatively longer, and the time [2, La, jB, jB...
→ When non-bringing is performed, the time [
Since the ripple values of pulse signals 1) and 2 and [4 are different, the ripple values of pulse signals a and b at time t4 are compared, and since they are different, the rotation in the direction of arrow A1 and the rotation direction are incorrectly detected. .

In this way, → the non-bringing interval is the pulse signal a.

If 1/4 period of b is exceeded, the direction of rotation will be incorrectly detected.
This can be said to be the same as when rotating in the direction of arrow A1. However, the maximum rotational speed for rotation in the direction of arrow Δ22 is 132 ft of that for rotation in the direction of arrow A1; therefore, the sampling period is 1//1 cycle of pulse signals a and b at the maximum rotational speed in the direction of arrow Δ27'j. The time must be as follows, and the number of executions of the program routine for detecting the rotational direction increases per unit time, making it impossible to make full use of the program.

The present invention 131 J has eliminated the drawbacks described above, and an embodiment of the present invention will be described in Sections 1 and 1 and above.

(Figure 1 shows the overall configuration diagram to clearly show the (111) structure of the present invention. Rotation detection (In several generations 1 to 5, the rotation of a rotating body whose 7υ height and φ m speed differs depending on the rotation direction is detected. The phase difference corresponding to the ratio of the two highest rotational speeds generated (the two pulse signals 8 of the same period are numbered) (the highest rotational speed 111 in the rotational direction where the south rotational speed is the same) !, rimbling occurs at a time interval smaller than the phase difference between the two pulse signals when the speed is turned.When the maximum rotational speed is reached, the current phase of one pulse signal is delayed when rotating in the direction of rotation. The lean pull value is the lean pull value of the one pulse signal 11r3 recorded in the edge detection means C storage means 10.
This time, the two zambles l1ji are compared by the matching detection means to determine whether they match or not. According to the detection results of the discrimination means (J1tsuji detection means and the match detection hand [!>) -C Determine the direction of rotation of the rotating body.

FIG. 5 is a plan view of an embodiment of a rotary direction detection mechanism for a rotary rotor to which the device of the present invention is applied.

In the figure, the same parts as in FIGS. 1A and 1([3) are designated by the same reference numerals 1 and their explanations will be omitted. J3 is in Figure 5,
A pulley 6 is fixed to the rotating shaft 1, and the light receiving elements 4 and 5 are fixed on the same circumference at an angle of 30 degrees with the rotating shaft 1 as the center. 6 is connected by a belt 7 to a pulley 9 fixed to a rotating shaft of a take-up reel stand 8 (4). When rewinding the cheap recoater shown in FIG. At time C, the supply reel stand 10 is rotationally driven in the opening direction by the motor, and as a result, the take-up reel stand 8 is rotated clockwise by the running tape, and the rotary plate 3 is rotated in the direction of arrow A2. , 11 and 12 are the recording and reproducing heads.The rotational speed of the motor is the same during fast forwarding and rewinding, but the rotational speed of the rotary plate 3 for rewinding is the same as that of the supply reel (not shown). U) Varies depending on the diameter of the j-b 5, and peaks just before the end of rewinding. If the maximum rotational speed of the rotating plate 3 in the direction of arrow Δ1 is reduced by 1, the maximum rotational speed in the direction of arrow A2 becomes about 2. For this reason, when the rotation 11 is rotated in the force direction by the arrow Δ, the light-receiving element 4 outputs a pulse signal C shown in FIG. B) Output the pulse signal d shown by G. In addition, the pulse signal c in Fig. 6 (A) and (B), [1 is the maximum rotational speed in the two directions to the arrow, then the mark Δ1 Pulse 1 for maximum rotational speed in the direction
．． Ei;c and +1 are as shown in FIGS. 6(C) and <D>, respectively. Here, regarding FIGS. 6(A) and (B),
The child focuses on the pulse signal [1 and calculates the rise of the pulse signal d [
・It is assumed that l numbering was performed for both pulses fi immediately before the ringing, and the next ringing is pulse IR"'4 d
If it is performed within the period TI of 1, immediately after the rise of vJl of pulse signal C and just before the fall of pulse signal C, the pulse In/''
(The dirt at d is detected and at this time T.

Since the levels of the pulse signal c and (1 are the same, it is determined that the rotation is in the two directions of arrow A, and the accurate rotation direction can be detected. In other words, time 11 is the maximum rimbling period. However, the pulse When detecting this etch by focusing on signal 15C, the maximum rimbling period is only the time T2 from the rise of pulse signal 18C to the rise of pulse signal d.

Therefore, when it is decided to detect the etch by focusing on the pulse signal d, the maximum leanbring period is the pulse signal j18 d when rotating in the arrow △1 direction as shown in FIG. 6 (C) and (f)). The time from the fall of C to the fall of the pulse signal C is T3, and this time 13 is the same as the time 11 of the platform at the highest rotational speed in the direction of arrow A2.

Therefore, in the apparatus of the present invention, the etch is detected based on the pulse signal d, and the direction of rotation is detected.

FIG. 7 shows a block system diagram of an embodiment of the device of the present invention. In FIG. 7, 4.5 is the light receiving element shown in FIG. j,'l';',
Both c and d are supplied to the computer 13.

1B-J-Y13 executes the program shown in Figure 8? ■
Then, the direction of rotation is detected.

This Vl-1 graph j1 routine shown in FIG. 1 2/3 Shuming (111 T+) shorter (11
It is executed at predetermined time intervals between. Also, when the computer is turned on, the ripple values C and I) are obtained.

Variable 1) l), l, IJP large i, k i! ilI
Epo is set to zero and it is C-.

When L's routine starts, step 20 (
By the previous execution of this routine, the pulse (Ag, 1.) is transferred to the variable 1)1) and stored in -C. Next step 2
1 (Pulse signal ga, 11 each are 4 non-bringing ()
11 people's rimple 1ilc, D is obtained. Next, Sunog 22C this time! A comparison is made between the variable aDD in which the previous sample 11r1 is stored, and the following processing is performed only when the two samples do not match, that is, when the pulse signal d is detected. If both stones match, the process of this routine is immediately terminated and the process returns to the main routine (not shown).

If the pulse signal (1) is detected in step 22, the current linsor ilj'i Q,
.

D is compared, and if the two do not match, suit 2
In step 4, the variable I is added to ``1'', and if they match, the variable I is decreased to ``1'' or subtracted in step 25, and the routine processing is completed and the process returns to the main loop (not shown). Of course above,
:I2 subj knob 2/I, 25 The direction of rotation may be displayed with Z.

In this way, the maximum rotational speed in the arrow △2 bra direction is the arrow A1
twice that in the direction, the Linn-Schilling period is
Pulse signals c and d at the maximum rotational speed in the direction of this arrow △2
Even if it is within 1/3 period of

As mentioned above, the rotational direction detection device "21' [,
Detects the rotation of a rotating body whose maximum rotational speed differs depending on the direction of rotation, and adjusts the ratio of both maximum rotational speeds accordingly.
(11) The rotation detection mechanism generates two pulse signals of the same period, and the rotation direction in which the maximum rotation speed is high;
The phase of the two pulse signals ΔJ, which is applied to the rotation 114 at a high rotational speed 1σ, is small.
Memories that remember the previous ripple rotation of the pulse signal, while the maximum rotation speed is different from the rotatability of the direction of rotation, while the phase lags in the rotational direction. means and
The first stage of etch detection detects the rising edge and rising edge of one pulse signal by comparing the previous sample value of pulse Ig) 13 with the current Linnol 1 shift;
This sample of 1 pulse signal 1ij + people 4 (1
The coincidence detection means detects an etch in one of the pulse signals and determines the direction of rotation of the rotating body according to the detection result of the coincidence detection means. It becomes a means of discrimination! Therefore, the rimbling period exceeds 1/4 period of the pulse signal (and it is possible to detect the rotational direction accurately), and the rimbling period can be set larger than before. 10
It has the advantage that the number of executions of program routines is small, and the computer can be used more effectively.

[Brief explanation of the drawing]

FIG. 1 (A>, (B) is a plan view of an example of a rotation detection mechanism,
Side view, Figure 2 (△>, (B), Figure 3 <A), (B)
Fig. 1 (Δ) and (f3> show the pulse output from the mechanism shown in Fig. 5). A plan view of an embodiment of the rotation detector (14) of the applied tape recorder, FIG. 6 (Δ) to (D) are pulse waveform diagrams output from the mechanism shown in FIG. 5, and FIG. FIG. 8 is a block system diagram of one embodiment of the computer shown in FIG. 6,9...
Zori, 7... Bell 1-18... Take-up reel stand, 1
0...1j (supply reel stand, 13...computer,
20-25 steps. Figure 1 Figure 2 Figure 3 Figure 6 Figure 7 Figure 1 4 Figure 8

Claims (1)

[Claims] Detects the rotation of rotating bodies with different J and C maximum rotational speeds in the rotational direction, and calculates the rotation speed according to the ratio of both maximum rotational speeds (1.9'
Generate two pulse signals of C and the same rotation + U) times 11λ detector 1i4, etc., at the highest rotational speed in the direction of rotation where the maximum rotational speed is large; II''i () The 2 pulses for each interval smaller than the phase difference between the two pulses 13
1 non-bringing means to limp the level of the two pulses Gokyu people to 1!7, and the maximum illumination speed will be delayed in phase to the rotation mouth 1 of the rotation direction B) The pulse The means for storing the previous lean pull value of Ig= is compared with the previous lean pull value IIQ of the -1 pulse signal and the current 4 non pull foci, and the one pulse fin is calculated. Detect falling etch]-Tsuji detection means, and compare the current ripple values of the two pulse signals with phase U to detect whether the coincidence is undefeated. 1. A rotational direction detecting device comprising: a determining means for determining the rotational direction of the rotating body according to the detection result of the coincidence detection when a signal niche is detected.