JPH073478Y2 - Magnetic tape winding error detection device for cassette tape player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a cassette tape player of a rotary head type or the like configured to pull out a magnetic tape from a cassette half and perform recording, reproduction, and the like. The present invention relates to a magnetic tape winding error detecting device for detecting whether or not a pulled-out magnetic tape has been completely wound into a cassette half.

(B) Conventional technology A rotary head type VTR or a digital recorder that pulls out magnetic tape from the cassette half for recording and playback.
As a tape running system in a cassette tape player such as an audio tape player, there is, for example, a system configured as shown in FIG.

In the cassette tape player configured as shown in FIG. 4, in order to wind the magnetic tape 5 wound around the rotary head 1 into the cassette half, a reel driver unit 11 is set by a microcomputer (hereinafter referred to as a microcomputer) 10. It is done by controlling.

By the operation of the reel driver unit 11, the reel motor 7 is electromagnetically locked, and the reel motor 6 is rotated in the arrow direction to move the slant pole 2, the tension arm 3, and the pinch roller 4 in the arrow direction.

When the magnetic tape 5 drawn out by this moving operation is wound up to the position of 5a and ejected, the microcomputer 10 checks the pulse signal from the signal generator 8 which generates the pulse signal according to the rotation speed of the reel, If a pulse signal is not input within a fixed time, it is determined that the magnetic tape 5 has not been wound, and a winding error process is performed.

(C) Problems to be solved by the invention However, in the above-described conventional method of detecting a winding error due to time, there is a variation in torque of the motor, influence of input operation due to low temperature, or other reasons, In addition, it is necessary to set the detection threshold value in consideration of this influence, and there is a defect that the detection accuracy is lowered.

This invention was made in view of the above points,
The purpose of this is a cassette that can detect a winding error of the magnetic tape based on the number of pulse signals according to the number of revolutions of the supply reel when the magnetic tape is unloaded and the remaining tape amount. An object is to provide a magnetic tape winding error detection device for a tape player.

(D) Means for Solving the Problems A magnetic tape winding error detecting device of a cassette tape player according to the present invention is a rotary head system or the like configured to pull out a magnetic tape from inside a cassette half for recording and reproducing. In the above cassette tape player, a signal generator for generating a pulse signal according to the number of rotations of the reel, a tape remaining amount calculating means for calculating the tape remaining amount by the pulse signal of the signal generator, the pulse signal and the tape remaining amount. And a reading means for reading a quantity information signal,
When the magnetic tape is wound, the number of pulses counted according to the number of rotations of the supply reel is compared with the number of pulses corresponding to the remaining amount of the tape to detect a winding error of the magnetic tape.

(E) Action Compare the number of pulses counted according to the number of revolutions of the supply reel when winding the magnetic tape with the number of pulses corresponding to the remaining tape, and when the following conditions are met, wind the magnetic tape. Judge as a mistake.

｜ (Number of pulses counted according to the number of revolutions of the supply reel when winding the magnetic tape)-(Number of pulses corresponding to the remaining tape) ｜> (Variation value at the time of sampling) It is the value obtained by.

(F) Embodiment An embodiment of the magnetic tape winding error detecting device of the cassette tape player according to the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a schematic configuration diagram showing the overall configuration,
FIG. 2 is a schematic partial configuration diagram for explaining the operation, and FIG. 3 is a flowchart diagram.

In the embodiment of the present invention, as shown in FIG. 1, when a magnetic tape (cassette tape) is set and the tape is loaded, a rotary head drum (hereinafter referred to as a drum) is used.
1, the magnetic tape 5 is wound in the state shown by the solid line, so that the reel motor is set to the loading state, that is,
The reel motor drive unit 11 is controlled by the microcomputer 10, the take-up reel 7 is locked, and when the magnetic tape 5 is pulled out by the slant pole 2, the supply reel 6 is directed in the direction of arrow 15a so that the magnetic tape 5 does not sag. Torque is applied to move the magnetic tape 5 from the position 5a in the direction of the slant pole 2 in the direction of arrow 12, the tension arm 3 in the direction of arrow 13, and the pinch roller 4 in the direction of arrow 14.

At this time, since the take-up reel 7 is locked in the loading state, the magnetic tape is pulled out only from the supply reel 6 side, and the microcomputer 10 generates a signal that generates a pulse signal according to the rotation of the reel. Bowl 8
A pulse corresponding to the number of rotations of the supply reel 6 is input and counted.

After the tape loading is completed, during normal operations other than pause and stop, the tape remaining amount calculation means 9 inputs a pulse signal according to the number of rotations of the take-up reel 7 and the supply reel 6 from the signal generator 8, The remaining amount is calculated and output to the microcomputer 10, and the microcomputer 10 constantly reads and recognizes the remaining tape amount.

When the magnetic tape is ejected, the tape is unloaded, that is, the reel motor is set to the loading state, the slant pole 2 is an arrow 12a, the tension arm 3 is an arrow 13a, and the pinch roller 4 is an arrow 14a.
When the magnetic tape 5 is wound up to the position of 5a by moving in the direction of, the magnetic tape pulled out is wound around the hub on the side of the supply reel 6 as in the case of the loading described above, and the supply reel 6 is indicated by the arrow 15a. Rotate in the direction.

At this time, the microcomputer 10 inputs a pulse signal corresponding to the rotation speed of the supply reel 6 from the signal generator 8 and counts it. The number of pulses according to the number of revolutions of the supply reel at the time of winding the tape, which is counted by the microcomputer 10, varies depending on the amount of tape wound around the hub on the side of the supply reel 6 although the amount of pulling out the magnetic tape is constant. When the amount of tape wound around the hub on the supply reel 6 side is large, the number is small, and conversely, when the amount of tape is small, the number of pulses is large.

That is, the number of pulses changes according to the number of revolutions of the supply reel at the time of winding the tape, which corresponds to the remaining amount of the tape. Therefore, the number of pulses counted according to the number of revolutions of the supply reel at the time of winding the tape corresponding to the remaining tape amount and the remaining tape amount read by the remaining tape amount calculating means 9 are stored in the microcomputer 10. The number of pulses is calculated, and when the following conditions are satisfied, it is determined that a tape winding error has occurred, and the microcomputer 10 performs winding error processing.

｜ (The number of pulses counted according to the number of revolutions of the supply reel when winding the tape)-(The number of pulses corresponding to the remaining amount of tape) ｜ ＞ (Variation value at sampling) Here, the variation value at sampling is determined by experiment. It is the calculated value.

Specifically, as shown in FIG. 2, when the tape unloading is completed, the microcomputer 10 detects the non-rewinding state such as the magnetic tape 5b, and the winding error process is performed by the reel driver unit. 11 is set so that the take-up reel 7 also rotates in the direction of arrow 16, and both the supply reel 6 and the take-up reel are wound with a torque larger than that when the tape is unloaded.

In addition, the remaining tape amount must be sampled by the signal generator 8 for several pulses during the normal operation other than stop and pause after the tape loading, during the normal operation except for stop and pause. Since the remaining amount cannot be calculated, the microcomputer 10 cannot determine the winding error because the remaining amount of the tape is unknown until the microcomputer 10 reads the calculation result and is ejected during tape loading.

Therefore, the number of pulses corresponding to the number of rotations of the supply reel at the time of pulling out the magnetic tape, which is counted at the time of loading the tape, and the number of pulses according to the number of rotations of the supply reel at the time of winding are compared to determine a winding mistake.

FIG. 3 shows a processing procedure of the microcomputer 10.

(G) Effect of the Invention According to the magnetic tape winding error detection device of the cassette tape player according to the present invention, the tape winding is detected based on the number of pulses corresponding to the remaining amount of the tape and the rotation speed of the supply reel when the tape is pulled out. Since the number of pulses according to the number of revolutions of the supply reel at that time is counted to judge a tape winding mistake, there is no influence of slower mechanical operation and variations in reel motor torque due to low temperatures or other reasons. Therefore, it is possible to accurately determine a tape winding mistake without changing the conventional circuit configuration.

Further, the above functions are largely dependent on the software of the built-in microcomputer, and there is an effect that the functions can be increased without increasing the cost.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a schematic configuration diagram showing the overall configuration, FIG. 2 is a schematic configuration diagram for explaining the operation, and FIG. 3 is a flow chart. It is a figure. FIG. 4 shows a conventional example and is a schematic configuration diagram showing the overall configuration. 1: Rotating head drum 2: Slant pole 3: Tension arm 4: Pinch roller 5: Magnetic tape 6: Supply reel 7: Take-up reel 8: Signal generator 9: Tape remaining amount calculation means 10: Microcomputer 11: Reel driver unit

Claims (2)

[Scope of utility model registration request] 1. A signal generator for generating a pulse signal according to the number of revolutions of a reel in a cassette tape player of a rotary head type or the like, which is constructed so that a magnetic tape is pulled out from inside a cassette half for recording and reproducing. , A tape remaining amount calculating means for calculating the tape remaining amount by the pulse signal of this signal generator, and a reading means for reading the pulse signal and the information signal of the tape remaining amount, and the number of revolutions of the supply reel at the time of winding the magnetic tape. The number of pulses counted according to the number of pulses is compared with the number of pulses corresponding to the remaining amount of tape, and it is configured to detect whether or not the tape has been completely wound into the cassette half when the magnetic tape was pulled out in the previous period. A magnetic tape winding error detection device for a cassette tape player. 2. When the tape remaining amount calculating means is in a state where the tape remaining amount cannot be calculated, the number of pulses corresponding to the supply reel rotation number when the magnetic tape is pulled out, which is counted when the tape is loaded, and when the tape is wound. A utility model registration request characterized in that it is configured to detect whether or not the tape has been completely wound into the cassette half when the magnetic tape is taken out by comparing it with the number of pulses according to the number of revolutions of the supply reel. A magnetic tape winding error detection device for a cassette tape player as set forth in claim 1.