JPS5987681A - Tape remainder display device - Google Patents

Abstract

PURPOSE:To respond plural cassette tapes different in total tape length and to improve display accuracy and response capability by making only number of rotation of supply reel side a variable, determining the tape remainder from a specified formula, and displaying the result. CONSTITUTION:It is understood from the formula that a square Ps<2> of number of rotation when the ratio of remainder becomes equal is the same even when the kind of the tape is different, provided that the product deltal of thicknes of the tape delta and total length l of the tape is the same. A signal corresponding to the number of rotation Ps of the supply reel is obtained by a rotation detecting device 6 of the supply reel, and a signal corresponding to Ps<2> is obtained by a multiplier circuit 7. To obtain a reciprocal, a signal corresponding to 1/Ps<2> is obtained by a division circuit 8 that makes 1 a dividend. Then, K2/Ps<2> is obtained by multiplying the signal 1/Ps<2> by K2 by a multiplier circuit 10. Next, a signal corresponding to K<2>/Ps<2>-K3 is obtained by a subtracter circuit 10 that makes K3 a subtrahend. Further, an output signal corresponding to K1[(K2/Ps<2>)- K3] is obtained by a multiplier circuit 11 that makes K1 a multiplier.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape remaining amount display device for displaying a tape remaining amount ratio in a cheap coater.

One of the conventional devices for displaying the remaining amount of cassette tape is one in which the maximum recordable time of the cassette tape in use or the total length of the tape is used as one variable in the calculation formula for determining the remaining amount of tape. With this conventional device, it is necessary to switch the above-mentioned variables to values according to the type of tape, and each time the type of tape to be used is changed, it is necessary to operate the tape type changeover switch, which is a hassle. there were.

In addition, as an improvement over the drawbacks of the conventional apparatus, a system has been implemented in which it is possible to automatically cope with liquefaction of the entire length of the tape by calculating the data obtained from the rotation speed detection means. This method is based on the fact that the differential coefficient of the reel rotation speed differs depending on the type of tape, and uses this differential coefficient to determine the type of tape, that is, the difference in the total length of the tape.

However, with this method, the differential coefficient of the reel rotation speed is entered into the front 6G, F, and 5 as a variable in the calculation formula for displaying the remaining tape amount, so if you try to play the correct 11-double, the reel will rotate for a relatively long time. I have to monitor the change in numbers.
Therefore, it is not possible to achieve both accuracy and responsiveness.An object of the present invention is to provide a tape type selection switch for selecting multiple tapes with different total lengths without providing an equivalent tape type selection switch. An object of the present invention is to provide a 1" tape remaining amount display device which is capable of responding to cassette tapes and has excellent display accuracy and responsiveness.

Generally, there is an inversely proportional relationship between the total tape length and tape thickness in a cassette tape. That is, the longer the total length of the tape (Q), the thinner the detail thickness becomes.Conversely, the longer the total length of the tape (7J) is 9'', the thicker the 7''-g thickness becomes. Regarding the total length of the tape and the thickness of the tape, especially C-60, C'-90, and C-120.
1620 mm", which is almost the same. This means that the cross-sectional area of the tape is almost the same, so for example, if the tape is wound on the supply reel, The winding diameter at this time is Me f'Ik 61
The tapes are almost identical.

In addition, in the process of being gradually wound on the take-up reel from this state, the length of the tape wound on the supply reel when both winding diameters become the same is the ratio of the tape to the total length of the tape. ,
In other words, if we look at the remaining amount ratio, it can be inferred that the above types of cassette tapes are almost the same.

As mentioned above, I tried to perform StX on cassette tapes due to the relationship between the total length of the tape and the thickness of the tape.

Figure @1 shows the tape running system.

The tape 6 is transferred from the supply reel 1 to the take-up reel 2 by the cab stun 4 and the pinch rl-ra 5.
V indicates that the tape is being wound at a constant speed. Here, rs indicates the diameter of the tape wound on the reel 1, the hub radius, and the number of reel rotations in this state.

At this time, supply 11'! II) The total length of the tape 5 wound on the reel 1 is l, and the tape thickness is δ.

δl, = π(r!ya) It is.

therefore· Also = 1 (γ knee γ ri becomes. Here's the full length of the tape! Compared to Toshiko.

In other words, when determining the remaining amount ratio, the following equation (1) holds true.

On the other hand, the number of revolutions of the supply reel 10 times is the first-order formula (21).

Substituting equation (21) into equation (11), we get the linear equation (61).

(61) In 29, consider the tape speed r to be constant.

V' becomes a constant and can be set as 1. Furthermore, since the hub radius can be kept constant, r:! In other words, (5
Equation 1 depends on 7 as the first order.

From this, if the tape thickness a and the total length l of the chi 7'' are the same, then the square of the rotational speed n when the remaining amount ratio is the same
It can be seen that the temperatures are the same even if the temperature is 71 degrees Celsius. 1. As mentioned above.

C-60 and c-9o have the same δl.

It can be seen that a correct remaining amount ratio can be obtained in C-120 or by setting δ as a constant and setting only the number of rotations as a variable and using the C11jIt field. .

As mentioned above, when dealing with the information generated by the rotation of the reel as well as the number of rotations, ``C torture f: 6 17'' is calculated. It is clear that the same holds true even if we take an interval and replace it with the number of pulses in that interval.

The characteristics of the present invention are as follows:
The point is that the remaining amount ratio can be obtained.

An embodiment of the present invention will be described below with reference to FIG. First, a supply side reel rotation speed detection means 6 is provided. and,
From this 10 rotation number detection means 6.

A signal corresponding to the rotation speed P of the supply reel.

A signal corresponding to P,' is obtained by the circuit 7. .

Next, in order to take this reciprocal, a gradual boundary circuit 8 with 1 as the divisor
Borrow the 400th issue corresponding to 1/P:. Subsequently, the signal 1. /p, F multiplied by 4' χA!
ask for a seat.

Next, a corresponding output signal is generated by the demultiplexing circuit 10, which subtracts 3 and 1. This is No. 1H, which represents the remaining amount ratio according to the formula (4) above, and is the display IC! 1st path 12th is a more overdrawn format, for example, it is displayed in ``chi'' and is small.

It goes without saying that the above-described calculations may be performed in one row by a computer such as a microcomputer.

As described above, according to the present invention, the "CIJ"
- using only a means of detecting the rotation speed of the wheel;
Also, based on the take detected by this means, the
4i: Since the calculator 6 for calculating the ratio does not require variables according to the type of cassette tape used, the % dictionary device is simple and has a fast ramp-up speed, and is easy to operate. ◇ 6. Therefore, the responsiveness of the tape remaining amount display is poor.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a reel portion V of a Q7 recorder in which the front and rear ends are attached, and FIG. 2 is a block diagram showing an embodiment of the present invention. 1... Supply reel 2... Street reel 3... Tape 6... Reel rotation a@output means

Claims (1)

[Claims] (1) Reel rotation speed detection means and arithmetic circuit. and a display circuit that displays the output obtained as a result of the calculation, and the tape thickness is set to δ. Full length of tape! , When the number of revolutions of the supply reel is Ps, the product of δ and 1 is assumed to be constant regardless of the details of the tape, and with only the above C as a variable, the remaining chive is calculated from the formula below, and this is expressed as A tape remaining amount display device characterized by displaying the information using a display circuit. However, f, , K, are constants