JPS6052990A - Tape feeding quantity detecting device - Google Patents

Abstract

PURPOSE:To detect and display in a real time a tape feeding quantity without deteriorating the accuracy with simple constitution, by determining the sum number of pulses corresponding to a tape feeding quantity being in a non-linear relation to a pulse number ratio of a detecting pulse being proportional to an angular velocity of each supply and take-up reel, as a discontinuous linear relation. CONSTITUTION:A pulse number sum S corresponding to a tape feeding quantity, etc. in a non-linear function relation to a ratio (m) is calculated based on an expression I from a pulse number ratio (m) of a detecting pulse being proportional to an angular velocity of each supply and take-up reel. An arithmetic value by the expression I in which, for instance, the ratio (m) is 1.0, 1.5, 2.0, 2.5, etc. is stored in a microprocessor, etc., and the sum S to an optional ratio (m) is calculated approximately without reading out a large capacity memory in a state that the ratio (m) and the sum S are in a discontinuous linear relation, and without executing complicated arithmetic. In such a way, tape feeding quantity can be detected and displayed by a real time without deteriorating the accuracy by a simple constitution. In the expression, b1 and b2 are constants.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention electrically detects the amount of winding of a tape member configured to be wound onto a second tape reel from a state where it is wound on a first tape reel. The present invention relates to a tape transport amount detection device which is suitable for display devices such as tape recorders that display the tape transport amount or remaining tape amount in real time.

First, the tape transport amount detection method used in the tape transport amount detection device of the present invention will be explained with reference to the drawings. FIG. 1 is a drawing showing the main part of this invention. symbol. is the running speed of the tape member 1, and the symbol a1 + dl + D
I, ω] are the hub diameter, tape winding diameter, maximum tape winding diameter, and angular velocity on the first tape reel side, and are denoted by symbol a2. d2
,1)2. ω2 is the hub diameter on the second tape reel side, the tape winding diameter, and the tape maximum winding diameter in this order. The angular velocity ω1 on the first tape reel side can be expressed as (1), and the angular velocity ω1 on the second tape reel side
2 can be expressed as. The number of pulses Pl proportional to the angular velocity ωl is expressed as Pl−α, where α1 is the proportionality constant.
]ωl (3) It can be expressed as: The number of pulses P2 proportional to the angular velocity ω2 is expressed as P2-α, where α2 is the proportionality constant.
It can be expressed as 2ω2 (4). , the pulse number ratio m is □=”a
l, P+ (5) Therefore, the ratio ω2/ω1 of the angular velocity ωl and ω2 can be expressed as ÷÷, and the sum S of the number of pulses P and P2 is
Using equations (1) to (6), S = P++ T'
2 α21 υ x! It can be expressed as Far FT(1'+1/m) (7). Now, if αl-α2=α, that is, if the ratio of the pulse signal Pl proportional to the angular velocity ω1 of the first tape reel is equal to the ratio of the pulse signal P2 proportional to the angular velocity ω2 of the second tape reel, then Equation (7) can be expressed as . . . (8). In formulas (7) and (8), the symbol r + al + a2 + [)l + D2 +
Since al + α2 is a constant determined by the initial conditions, αl/α2 = b2 (10) Using constants 1)l and l)2, formula (7) is S=1]I
It can be expressed as J〒■-ko(1+1/m)-(7'). Similarly, equation (8) is S= t)+r (1+17
m) ... (8') can be expressed as 6, Equation (7'), Equation (8'), tape transfer:
Alternatively, a method of directly detecting the remaining amount of tape may be considered. One method is to measure the pulse number ratio m, and use the measured pulse number ratio m to directly calculate the content shown in equation (7') or (8') to estimate the pulse bedding material S. ,
This is a method of numerically displaying the amount of tape transferred or the remaining amount of tape corresponding to the pulse bedding. The other one is the pulse bedding S corresponding to the pulse number ratio m and the pulse bedding S corresponding to the pulse bedding S.

In this method, the tape transfer amount or remaining tape amount is set in a memory table, and the tape transfer amount or remaining tape amount corresponding to the measured pulse number ratio m@ is read out and displayed numerically. In the former case, the calculation time G is long and it is not suitable for displaying the tape transfer M or the remaining amount in real time.3. In the latter case, the response speed is fast or the memory table capacity is large. For example, if we take h-set tapes C-30, C-60, and C-120, the number of memory bits is C-30. 150 pinot l-, 300 hints for C-60, and about 600 hits for C-1 and 20 are required. Considering accuracy, etc., a large capacity of approximately 2000 bits is required, which in turn increases costs.

This invention was made in view of the above-mentioned problem, and it is an object of the invention to operate at a speed suitable for detecting and displaying the amount of tape transferred or the remaining 1 hour of tape in real time, and to provide an apparatus that The purpose of this invention is to reduce the cost of the parts constituting it as much as possible, and it is basically based on equations (7') and (8'), which are derived from an upward slope, and further developed from there. It is something that

Hereinafter, FIGS. 1, 2, and 3 of the drawings will be described with reference to embodiments of the tape transport amount detection device of the present invention.

This will be explained in detail using FIG. As a first signal generating means, for example, five holes 13 are formed at equal intervals near the outer periphery of a rotating disk 10 directly connected to a shaft 16 of a first tape reel (not shown). A light emitting element 11 and a light receiving element 12 are disposed facing each other on both sides of the hole 13 so as to generate pulse signals P1 five times as many times as the number of rotations of the first tape reel. As a second signal generating means, holes 23 are formed at equal intervals near the outer periphery of a rotating disk 20 directly connected to a shaft 26 of a second tape reel (not shown), for example, in the same number as the first signal generating means. A light emitting element 21 and a light receiving element 22 are arranged facing each other on both sides of the opening 23, and the rotation speed of the second tape reel is This is to generate five times as many pulse signals P2 as the number of pulse signals P2. The pulse signals Pl and Pz are shaped by waveform shaping circuits 1.4 and 24 as necessary, and are rectangular wave signals as shown in FIG. As a storage means, use the function t(x) or F(X)-I)IJpositive(1+'l/X)...
11) Given by the variable X of this function or an appropriate number of sequences Xi, ×
2. ..., Xn, for example, with 4 terms, each term being 1.0, 1.
5. Give as 2.0, 2.5. In this case, the function values F(1,0), F(1,5), F(
2,0), F(2,5) is υ determined by the initial conditions
+ 32 + constant of DI' = 47.63 m/5ec a2: 2 1.6 mrn 1]] 50. '5m? ? By giving it as +, we obtain the following numerical values: 1" (1,0) 78 F (1,5) 8.3 F (2, O) 9.25 F (2,5) 10.4. These function values are memorized.As a means of calculating the pulse number ratio m, the rise and fall of the rectangular waves of the pulse signals Pl and Pz are counted as the number of pulses, and the pulse number ratio m of these pulse signals P1 and Pz is calculated as follows. , it is measured by how many pulses of a short-cycle pulse signal enter between the longer cycle of one of the pulse signals.As a means of increasing the pulse bedding S, one of the pulse signals with a longer cycle is measured. The number of pulses PX and the number of pulses P2 that enter during the period are counted and calculated.As an addition means, the measured pulse number ratio ml is the corresponding number sequence 1.0, 1.5, 2.0.
.

For example, if the pulse number ratio m is 1.0, the term 2.5 is specified as the first term in the sequence, and the function value 7.8 corresponding to this first term is added S times to the pulse bedding. Added value 7.8
Get 8'. As a comparison detection circuit, this added value is compared with a suitable constant G, which is 256 when using a 4-tip microprocessor sensor, and is added. It is detected that the value has become larger than the constant G. The counting means uses this detection signal to count the count amplifier or count town based on the magnitude relationship between the period of the first pulse signal and the second pulse signal. The display means includes a storage means, a means for calculating the pulse number ratio m and the pulse litter S, an addition means, a comparison detection means, It is convenient for the counting means to be constructed using a general-purpose microprocessor.

FIG. 2 shows a flowchart when the system is configured using MicroProcef-IJ-. Symbol A, , A8.
Is, , 13□.

C1 and E are work memories, REW is rewinding,
In other words, this indicates that the running direction of the tape is opposite to the playing direction. The pulse signal P is determined by the judgment symbols 3a and 3b.
The magnitude relationship between the cycles of l and P2 is determined. symbol 3c1
The frame indicated by symbol 3c is provided as a subroutine and indicates that the pulse bedding S is to be applied, and the frame indicated by symbol 3d is the pulse signal p.

It shows that the pulse number ratio m is calculated when the period of is large,
The frame indicated by symbol 3e indicates that the pulse number ratio m is determined when the period of the pulse signal P2 is large.

In such an embodiment, as shown in FIG.
In the range of X < 1.5, the pulse bedding material S is calculated using the following formula:
In the range of 1.5≦X<2.0, the pulse bedding material S is approximated by the following formula, 0,5 +F(1,5), and in the range of 2,0≦X<2.5, The pulse bedding material S is approximated by the following formula, 0.5 +F(2,0). The approximate value in this embodiment reaches its maximum at a position approximately 15% away from the center of the entire length of the tape member 1, resulting in an error of approximately 1.2%. 1
．． An error of about 2% is practically acceptable, but if you want to further reduce the error range, use the sequence X1+x2+...
The 0-pinch interval, which can reduce the error by setting a small pitch between adjacent terms of +xn, is determined in consideration of practicality.

Further, the number of bits of the ROM used as the storage means in this embodiment is approximately 50 bits, which is very small.

Even in the case of high precision, the number of bits of about 100 bits is sufficient, and the cost of the microprocessor is reduced.

Furthermore, since the sexagesimal time display operation in this embodiment requires less time for addition, counting, and other operations of the microprocessor, the sexagesimal time is displayed approximately every 1.0 seconds. Therefore, it can be said that this device is capable of detecting the amount of tape transport in real time.

[Brief explanation of drawings]

Fig. 1 is a drawing explaining the invention in detail, Fig. 2 is a flowchart showing the flow of information in the microprocessor, Fig. 3 is a pulse signal waveform diagram, and Fig. 4 is a graph showing changes in the pulse signal sum S. be. 1...Tape member, 2...Function key R,
'#1.・, 3... microprocessor, 4...
Numeral display device, 10.20...disc, 11.
21...Each emitter, 12.22...Each receiver, 13.23-...Each aperture, 14.24.
...Each waveform shaping circuit, 15.25...Each motor, 16,26...Each axis. Figure 1

Claims (1)

[Claims] 1. From the state wound on the first tape reel to the state wound on the second tape reel.
In a tape transport amount detection device configured to electrically detect the winding amount of a tape member, the tape member is wound on a tape reel, and a pulse signal P1 at a rate proportional to the angular velocity of the first tape reel is transmitted. a first signal generating means that generates a pulse signal P2 at a rate proportional to the angular velocity of the second tape reel; a period of the pulse signal P1 or the pulse signal PiI, whichever is longer; Means for calculating these pulse signals P, the pulse number ratio m (-P2/P]) and the pulse bedding S (-"1+P2) of the pulse signal P2 for each period of , and the function F (
x) is F(X) −bt tJT〒b2x” (1+' 1
/X) However, bl, b2: Each is given as a constant, and the variable
.... Function values F(x+) and F(xg) when given by Xn. . . . A storage means for storing F(Xn), a number sequence X1 + Xn + . . . corresponding to the pulse number ratio m, searches for the term of Adding means for adding S times; comparison detecting means for comparing the added value added by the adding means with an appropriate constant G and detecting that it is larger than the constant G; and counting based on the detection signal of the comparison detecting means. 1. A tape transport amount detection device comprising: an amplifier or a counting means for counting down; and a display means for displaying the counted value of the counting means. 2. The tape according to claim 1, wherein the ratio of the pulse signal Pl proportional to the angular velocity of the first tape reel is equal to the ratio of the pulse signal P2 proportional to the angular velocity of the second tape reel. Transfer amount detection device.