JPH0522310B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a tape running device used in a tape recorder or the like.

[Technical background of the invention and its problems] In a tape running device, tape tension is constantly controlled in order to prevent unnecessary tension from acting on the tape and to realize smooth tape running.

The tension of this tape is controlled by hanging the tape on a tension arm that is biased in one direction by a spring so that the tension arm is always at a constant position. Specifically, tape tension is detected by a tape tension detection means, the signal is amplified by an amplifier circuit, and the reel motor is driven via a motor drive circuit. Furthermore, since the reel motor and the tape tension detection means are considered to be connected via the tape, the entirety forms a closed loop control system.

By the way, the optimum gain of this tape tension control system differs depending on whether the tape is stopped, when it is being played back, or when it is being wound quickly. Conventionally, the gain has been optimized when the tape running speed is slow.

However, with the above gain settings, there is not enough torque during fast winding, which weakens the tension and may cause the tape to slip.However, if you increase the gain to avoid slipping, the tape will "stop" and the tape will stop.
There was a problem that the gain was too high when the rotation was slow, such as during "playback", and the tension arm was damaged. Furthermore, if the gain is set to be optimal when the tape speed is slow, there is a drawback that the maximum tape speed during fast winding is limited.

[Object of the Invention] The present invention has been made in view of the above circumstances, and provides a tape running device that can optimally set the gain of a tape tension control system regardless of whether the tape running speed is fast or slow. The purpose is to

[Summary of the Invention] To achieve the above object, the present invention provides a tape running speed detection means for detecting a tape running speed, and a tape speed signal generating means for outputting an electric signal according to the detected tape running speed. and a tape tension detection means for detecting the tension of the tape, a motor for driving a tape reel, and a motor drive means for driving and controlling the motor according to the output of the tape tension detection means. The tape running device is characterized by comprising variable gain amplifying means for amplifying the output of the tape tension detecting means by varying the gain according to the output of the tape speed signal generating means and outputting the amplified output to the motor driving means. That is.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

First, an example of a tape recorder to which the present invention is applied will be explained with reference to FIG. In Figure 2, there are take-up reels (abbreviated as T.UP reels) for winding tape 2 on both sides of head section 1.
3. Supply reel for supplying tape 2 (SUP
A reel (abbreviated as ``reel'') 4 is provided, and each reel 3, 4 is driven by a reel motor 3A, 4A, respectively. Also, between the head section 1 and the T.UP reel 3, a tension arm 5, a tacho roller 6, and a guide roller 7 are provided.
However, a guide roller 8, a capstan 9, and a tension arm 10 are provided between the head portion 1 and the SUP reel 4, respectively. The tacho roller 6 is for detecting the running speed of the tape. The capstan 9 drives the tape 2 to keep the running speed of the tape 2 constant during reproduction and recording. The tension arms 5 and 10 are used to detect tape tension. For example, the tension arm 10 is biased in one direction by a tension spring 11, and the tension arm 10 is biased in one direction by a tension spring 11. Arm 1
The tension detection section 12 detects the position where the tape 2 is displaced in accordance with the tape tension, and the tension detection section 12 of the tape 2 detects the position where the tape 2 is displaced.

Next, an example of the tape running device according to this embodiment will be explained with reference to FIG. In the following explanation, only the motor 3A that drives the T.UP reel 3 among the reel motors 3A and 4A will be explained.
In the figure, a tape speed detection circuit (tape speed detection means) 20 detects the rotation of the tacho roller 5 using an optical encoding method, and detects the running speed of the tape 2 based on this. The tape speed voltage generating circuit 21 is an example of a tape speed signal generating means that outputs an electric signal based on the tape speed detected by the tape speed detecting circuit 20. The tape tension detection circuit 22 is
It is composed of the tension arm 10, a tension spring 11, and a tension detecting section 12, and is adapted to output a voltage according to the tape tension detected by the tension detecting section 12. The variable gain amplifier circuit 23 includes the tape speed voltage generation circuit 2.
1. The output of the tape tension detection circuit 22 is input, and the gain is varied depending on the output voltage of the tape speed generation circuit to amplify and output the output of the tape tension detection circuit 22. The motor drive circuit 24 adjusts the T.UP based on the output of the variable gain amplifier circuit 23.
It drives and controls the reel motor 3A.
Incidentally, since the reel motor 3A and the tension arm 10 are considered to be connected via a tape, the above-mentioned control system forms a servo loop.

The operation of the device configured as above will be explained.

As described above, since the tape tension detection circuit 22, the variable gain amplifier circuit 23, the motor drive circuit 24, and the reel motor 3A form a servo loop, the motor The motor 3A is operated via the drive circuit 24 to maintain the tape tension constant.
4A can be driven and controlled.

Moreover, in the apparatus of this embodiment, the output voltage of the tape tension detection circuit 22 is amplified while the variable gain amplifier circuit 23 varies the gain in accordance with the tape speed. Therefore, the gain of the above control system is a value corresponding to the absolute value of the tape speed as shown in Fig. 3, that is, the gain G ₁ when the tape is stopped, and the gain G 1 when the tape is running.
The gain can be set to G ₂ and G ₃ during fast winding.

Therefore, the control system is set to the optimum gain regardless of whether the tape running speed is fast or slow, and the tape running speed during fast winding is not limited to below a certain value as in the prior art. Furthermore, since the tape tension is set and controlled to be constant, there is no possibility of the tape slipping and causing running abnormalities.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the gist of the present invention. For example, if the capstan rotates together with the tape even during fast winding, the tape speed detection means may detect the rotation of the capstan to determine the tape speed.

[Effects of the Invention] As described above, according to the present invention, it is possible to provide a tape running device that can set the motor control system to the optimum gain regardless of whether the tape running speed is high or slow.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a tape running device according to the present invention, Fig. 2 is a schematic explanatory diagram of a tape recorder to which the present invention is applied, and Fig. 3 shows the relationship between the absolute value of the tape speed and the gain of the control system. FIG. 20... Tape speed detection means, 21... Tape speed signal generation means, 22... Tape tension detection means, 23... Variable gain amplifier circuit, 24... Motor drive means.

Claims (1)

[Claims] 1. A tape running speed detecting means for detecting the tape running speed, a tape speed signal generating means for outputting an electric signal according to the detected tape running speed, a tape tension detecting means for detecting the tension of the tape, and a tape reel. In a tape running device for controlling tape tension, the tape running device includes a driving motor and a motor driving means for driving and controlling the motor according to an output from the tape tension detecting means, in which the tape running device controls the tension of the tape according to the output from the tape speed signal generating means. A tape running device comprising variable gain amplifying means for varying the gain to amplify the output of the tape tension detecting means and outputting it to the motor driving means.