JPS589503B2 - tape counter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape counter, and more specifically, it outputs a number of pulses proportional to the amount of tape movement, and calculates the number of pulses to detect the amount of tape movement. Regarding the tape counter.

Most conventional tape counters receive power from the reel on the tape winding or supply side to operate a normal mechanical rotary counter, but as shown in Figure 1, this The counter speed becomes a hyperbolic curve, counting quickly at the beginning of tape winding and slowing down as it approaches the end of winding.
It is very difficult to calculate what percentage of the total amount of tape remains or how much has been used, and it is difficult to even calculate how many counts are half of the total amount of tape.

The scope of its application is narrow because it only tells you what kind of information is contained in what count.
It is difficult to use.

The purpose of this invention is to solve the above-mentioned disadvantages of the conventional tape counter, and its feature is that the total amount of tape is set in advance in the calculation mechanism, and the total amount of tape is A tape that displays the current percentage of the total tape amount as a ratio between the amount and the current tape amount obtained by outputting a number of pulses proportional to the amount of tape movement after the tape starts running. It provides a counter.

This invention will be described in detail below with reference to examples.

FIG. 2 shows the structure of the tape counter of the present invention. Rotation pulses output from a rotation detection mechanism 1 which outputs rotation pulses in proportion to the amount of tape movement enter an arithmetic circuit 2.

A calculation is performed using the preset total tape amount B and the current amount A obtained by the rotation pulse, and the calculation result is sent to the counter 3 at regular intervals.

The display circuit 4 has a mechanism for displaying the contents of the counter as a percentage.

FIG. 3 shows an example of the arithmetic circuit 2. As shown in FIG.

The rotation pulse output from the rotation detection mechanism 1 is input to an arithmetic counter 2c and a frequency divider circuit 2a, and the output of the frequency divider circuit 2a is input to a memory circuit 2b. The contents of the circuit 2a are stored in the storage circuit 2b.

Therefore, this memory circuit 2b stores 1 of the initial total tape amount.
/100 is set, that is, if the total amount of tape being used is represented by B, then B/100 is stored in the storage circuit 2b by the set terminal t1.

Further, the output from the calculation counter 2c and the output from the storage circuit 2b are outputted to the matching circuit 2d, and when the stored contents of the storage circuit 2b and the contents of the calculation counter 2a match, a reset Hals is output to the calculation counter 2c, and the output of the calculation counter 2c is output to the matching circuit 2d. Clear the contents.

In other words, the calculation of A÷(B/100) is performed by the calculation counter 2.
The output is sent as it is to the subsequent counter 3 as a percentage value of the current tape amount to the total tape amount, and the value counted by the counter 3 is displayed as a percentage by the display circuit 4.

Note that t2 in FIG. 3 is a clear terminal.

To explain the above-mentioned counting mechanism in more detail, the numerical value stored in the above-mentioned storage circuit 2b (this corresponds to the number of times the entire tape is read by fast-forwarding the tape and divided into 1/100, or for each tape to be used). (Select the amount of memory with a changeover switch, etc. and store it with a set operation) and the count value of the arithmetic counter 2c that counts when a number of rotation pulses corresponding to the amount of tape movement from the rotation detection mechanism 1 are input in the normal use state. When they match, the matching circuit 2d outputs a reset pulse to the arithmetic counter 2c, and the subsequent counter 3 and display circuit 4 display an integration of 1% for each reset pulse.

For example, in the case of a tape whose total tape amount is 400, the value set in the memory circuit 2b is 4.

When the rotation pulse during normal running reaches 4 counts from the beginning, a reset Hals is output from the coincidence circuit 2d.
The contents of the calculation counter 2c are cleared to 0, but the reset Hals is also output to the subsequent counter 3 and repeated in the same way, and when the rotation pulse reaches 400 counts from the beginning, the reset pulse has been output as 100 pulses and is displayed. is 100%.

When the rotation pulse counts 100 from the beginning, 25 reset pulses are output, indicating that the remaining tape usage is 25% (75), and if the tape is 60 minutes one way, 45 minutes remain. .

As described above, the present invention utilizes a rotation detection mechanism that sends out a number of pulses proportional to the amount of movement of a strip member such as a tape, and a calculation that calculates the amount of pulses and the overall amount of the strip member. The ratio between the amount of movement of the strip member and the amount that the strip member has already moved is calculated and the ratio is displayed at any point in time. The mechanical structure is simple, requiring no additional loads or mechanical connections.

(2) High reliability.

(3) The current tape amount relative to the total tape amount can be directly read.

(4) Accurate positioning is possible because it counts in proportion to the tape length.

(5) Electrical signals for controlling other elements can be easily obtained.

It has the following effects.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the operation of a conventional tape counter, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is a detailed diagram of the arithmetic circuit shown in FIG. DESCRIPTION OF SYMBOLS 1... Rotation detection mechanism, 2... Arithmetic circuit, 3... Counter, 4... Display circuit, 2a... Frequency dividing circuit, 2b... Memory circuit, 2c... Arithmetic counter, 2d... Matching circuit.

Claims (1)

[Claims] 1. In a recording or reproducing mechanism for a recording medium such as a tape, a rotation detection mechanism rotates by the recording medium and outputs a pulse proportional to the amount of movement of the recording medium, and an electrical calculation that calculates the pulse and the total amount of the recording medium. What is claimed is: 1. A tape counter having a mechanism for displaying the amount of tape at a given position as a percentage of the total amount of recording media.