JPH0472298B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a tape recorder that detects the end of a recording tape and stops the winding operation of the tape.

BACKGROUND ART In a conventional tape recorder, the winding operation is stopped when the rotation of the tape supply reel shaft has been stopped for a predetermined time or more. Cassette tapes may be wound loosely, and in this case, after the tape starts running, the tape supply reel shaft remains stopped for a certain period of time. In a device that detects stoppage, the determination of whether the recording tape has stopped running is redundant to the extent that the period during which the shaft is stopped due to tape slack can be tolerated.

For this reason, during steady tape running operation, the supply shaft is stopped for a certain period of time, and even though it can be determined that the tape is already at the end of the tape, it is determined that the supply shaft is in the stopped state after the above-mentioned wasted time has elapsed. As an improvement to this, the stop time of the driven reel required to determine the end of the tape is increased for a while after the drive reel starts driving, taking into account slack in the tape, and is shortened during normal running. What I did was hot.

Problem to be Solved by the Invention However, even in this case, the supply reel rotates and reaches the end of the tape immediately after the tape starts running.
When the rotation of the supply reel stops, it takes a long time for the supply reel to be stopped in order to determine that the end of the tape has come, and during this period, time and power are wasted.

Means for Solving the Problem The present invention to solve this problem detects the rotation of the supply reel for a period of time required to stop the supply reel to determine the end of the tape, which is set long enough to take into account slack in the tape. A setting means is provided for setting a short time for determining the end of the tape during normal operation.

Effect: With this configuration, once the slack in the tape is eliminated and the supply reel has once rotated, the rotation stop time of the supply reel required to determine the end of the tape is set to be short.

Embodiment A tape recorder according to an embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a conductor part 1a and an insulating part 1b are formed on the outer periphery of a supply reel shaft 1, and when the supply reel shaft 1 rotates, a contact switch 2 provided with a gap repeats conduction and non-conduction to detect rotation. The output repeats "0" and "1". The central processing unit 3, which is made up of a microcomputer, inspects the state of the rotation detection output, and measures the time that the rotation detection output remains in the same state using an internal stop detection timer, and determines when a certain period of time described below has elapsed. if,
It is determined that the tape has stopped.

Here, let us assume that the maximum time t1 is expected for the supply reel shaft 1 to remain in a stopped state after starting running due to loose tape winding, and allow for the maximum time for the rotation detection output to remain in the same state during steady running operation. Assuming that the considered time is t2, the central processing unit 3 first sets the value of t1 + t2 in the stop detection timer at the start of running, and once the rotation detection output changes, the reel shaft 1 actually rotates. t2 is set every time the rotation detection output changes from . In other words, even if the tape is loosely wrapped at the start of tape running, the time t1 + t2 is set, so no malfunction will occur; on the other hand, during steady running operation, the time t2
is set, it is possible to accurately determine whether the tape has stopped running or not, without wasting time.

Note that FIG. 2 is a flowchart showing the above operation.

First, a stop detection timer is set to t1+t2 as a time that takes tape slack into consideration. Then, in the next step, a change in the rotational state of the reel shaft 1 is detected. The rotation detection in this step is an area for determining the rotational state of the reel shaft 1, and an area for saving data on whether the signal obtained from the contact switch 2 as the reel shaft 1 rotates is "0" or "1". It is determined whether the data saved at that time and the signal from the contact switch 2 at that time match.

At the beginning, the reel shaft 1 is not rotating, so the signal from the contact switch 2 does not change and shifts to the left. Then, the value of the stop detection timer is incremented by 1 to determine whether the set time has elapsed, and if so, the rotation operation is stopped.

If the time has not elapsed, the process returns to the previous determination step of detecting a change in the rotational state. This routine is repeated, and the rotation operation is initially stopped when the time t1+t2 has elapsed.

On the other hand, in the judgment step of detecting a change in the rotational state, when the reel shaft 1 rotates and the signals of "0" and "1" from the contact switch 2 change, the reel shifts to the right and the contact switch 2 at that time changes. Save whether the signal from is "0" or "1",
Further, the stop detection timer is set to t2, and the process returns to the step of determining the detection of a change in the rotational state.

After that, in the determination step of detecting a change in the rotational state, if the reel shaft 1 is rotating, the signal from the contact switch 2 will be reversed every time the reel shaft 1 rotates half a rotation, so the signal from the contact switch 2 will be reversed. The saved states of "0" and "1" differ each time the reel shaft 1 makes a half rotation. Therefore, after passing through the left routine several times, the program moves to the right routine. Each time this routine on the right is passed, the stop detection timer is set to t2. While repeating this, the reel shaft 1 continues to rotate.

When the reel axis 1 stops, the state of the signal from the contact switch 2 saved in the routine on the right does not change, so it shifts to the left.
The routine of the determination step for detecting a change in the rotational state and the determination step for elapse of time is repeated until the time set in the stop detection timer has elapsed, and after the elapse of time t2, the rotation operation is stopped and the process is completed.

Effects of the Invention As is clear from the embodiments described above, according to the present invention, the determination of whether or not to stop tape running can be made reliably and quickly after the start of tape running or even during running, eliminating wasted time. The telephone answering machine has excellent effects such as being able to utilize telephone lines effectively.

In addition, even if the supply reel stops rotating due to the end of the tape immediately after the tape drive starts and the supply reel rotates, it is possible to determine that the end of the tape has come and stop the tape drive in a short period of time. It becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a main part configuration diagram showing an embodiment of the present invention,
FIG. 2 is a flowchart illustrating the operation of the central processing section. 1... Supply reel shaft, 2... Contact switch, 3... Central processing section.

Claims (1)

[Scope of Claims] 1. A tape recorder that winds a tape wound around a supply reel, comprising: a detection means for detecting the rotation state of the supply reel; and a detection means that detects the rotation of the supply reel during the winding operation. a timer for measuring the duration of the stopped state after detecting that the tape is in the stopped state; and immediately after the start of the winding operation, the timer is set to a time longer than the set time during steady operation while the tape is running. , a setting means for setting the set time during the steady operation based on the rotation of the supply reel being detected by the detecting means; and a setting means for setting the set time for the steady operation, and the time measuring means for measuring the time set by the setting means. A tape recorder comprising: a control means for determining the end of the tape based on what has been done, and a means for stopping tape running based on the determination by the control means as the end of the tape. .