JPS62134843A - Tape travel device - Google Patents

Abstract

PURPOSE:To optimize the gain of a tape tensile force control system by controlling a motor driving a tape reel so that the tape tensile force can be constant according to the output of a variable gain amplification means changing gains in accordance with the output of a tape speed signal generation means. CONSTITUTION:A take-up reel 3 winding a tape 2, a supply tape 4 supplying the tape 2 are provided, and are driven by reel motors 3A and 4A, respectively. A tape speed detection circuit 20 detects the rotation of a tacho roller 5 by an optical encoding system, and further detects the travel speed of the tape 2 according to the detected rotation. A tape speed voltage generator circuit 21 outputs an electrical signal corresponding to the tape speed detected by the circuit 20, and a tape tensile force detection circuit 22 outputs a voltage corresponding to the tape tension detected by a tension detection part 12. The variable gain amplifier circuit 23 inputs the output of the circuit 22, and gains are controlled according to the output of the circuit 21. In accordance with the output of the circuit 23, a motor drive circuit 24 drives the reel motors, thereby optimizing the gains of the tape tensile force control system.

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] The tape running device does not apply unnecessary tension to the tape;
In addition, to ensure smooth tape running, tape tension is constantly controlled.

The tension of this tape is controlled by placing a laser on a tension arm biased in one direction by a spring so that the tension arm is always at a constant position. Specifically, the tension of the 7th line is detected by the 1st line tension detection means, and its transmission is amplified by the amplifier circuit, and the reel motor is driven via the 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 optimal gain of this tape tension control system is when the tape is stopped, when the tape is playing,
It differs depending on when you are running fast winding. Conventionally, this gain was considered optimal when the tape running speed was slow.
[I was trying to

However, with the above gain settings, there is not enough torque during fast winding, which may weaken the tension and cause the tape to slip.On the other hand, if you increase the gain to avoid slipping, 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 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 device that controls tape tension in each mode of stop mode, playback mode, and fast winding mode, and which detects the tape running speed. a tape speed signal generating means for outputting an electric signal according to the detected tape running speed, a tension detecting means for detecting the tension of the tape, and a tape reel driving means. The output of the tape tension detection means is amplified by varying the gain according to the output of the T-speed signal generation means, and the tape tension is determined based on the output of the variable gain amplification means. The present invention is characterized in that it has a motor drive means for controlling the drive of the motor so as to drive the motor at a constant level.

[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 described as a second example.
This will be explained with reference to the figures. In FIG. 2, there are pick-up reels (T,
A 3 degree reel (abbreviated as StJP reel) 4 for supplying the 3 degree tape 2 (abbreviated as UP creel) is provided, and each reel 3 degree 4 is connected to a reel motor 3A, 4.
It is designed to be driven by Δ. Further, between the head section 1 and the T and UP reel 3, a tension arm 5. A tacho roller 6 and a guide roller 7 are provided between the head section 1 and the SUP reel 4, and a guide roller 8. Capstan 9. A tension arm 10 is provided 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, and for example, the tension arm 10 is biased in one direction by a tension spring 11, and this tension arm 10 is used to detect tape tension. The tension of the tape 2 is detected by detecting the position displaced according to the tension by the tension detection section 12.

Next, an example of the tape running device according to this embodiment will be explained with reference to FIG. In addition, in the following explanation, the reel motor 3
A, T of 4A, motor 3A that drives the UP creel
Only the side 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 based on this detects the running speed of the tape 2. . Tape speed voltage generation circuit 21
is an example of a tape speed signal generating means that outputs an electric signal corresponding to the tape speed detected by the tape speed detection circuit 20. Tape tension detection circuit 22
is the tension arm 10. Tension spring 11. It is composed of a tension detection section 12, and this tension detection section 1
It is designed to output a voltage according to the tape tension detected in step 2. The variable gain amplification circuit 23 inputs the output of the tape speed voltage generation circuit 21° and the tape tension detection circuit 22, and varies the gain depending on the output voltage of the tape speed voltage generation circuit to output the output voltage of the tape tension detection circuit 22. J is amplified and output. The motor drive circuit 24 controls the T and U based on the output of the variable gain amplifier circuit 23.
It drives and controls the P reel motor 3A.

Note that the reel motor 3A and the tension arm 10
Since it is considered that these are connected via tape, the above-mentioned control system forms a servo loop.

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

As mentioned above, the tape tension detection circuit 22. variable interest
Amplification circuit 23. Motor drive circuit 24 and reel motor 3
Since the motor 3A forms a servo loop, the motor 3A maintains the tape tension constant via the motor drive circuit 24 according to the detection result of the tape tension tension detection circuit 22.

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 control system is a value corresponding to the absolute value of the tape speed as shown in FIG. 3, that is, the gain Gt when the tape is stopped, and the gain G2 when the tape is running.

At the time of fast winding, the gain can be set to G3.

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 pattern winding is not limited to below a certain value as in the past. Furthermore, since the tape tension is set and controlled to be constant, there is no chance of the tape slipping and causing running abnormalities.

Note that the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the gist of the present invention. For example, as a tape speed detection means, it is also possible to use a key (・
If the pushstand rotates together with the tape, it may be useful to detect the rotation of the pushstand 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 in which the motor control system can be set to the optimum gain regardless of whether the tape running speed is fast or slow.

[Brief explanation of drawings]

Figure 1 is a block diagram of the tape running device related to the misfire;
FIG. 2 is a schematic explanatory diagram of a tape recorder to which the present invention is applied, and FIG. 3 is a characteristic diagram showing the relationship between the absolute value of the tape speed and the gain of the control system. 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] A tape running device that controls tape tension in each of a stop mode, a playback mode, and a fast winding mode,
tape running speed detection means for detecting 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, a motor for driving a tape reel, and an output of the tape speed signal generating means. It has variable gain amplification means that amplifies the output of the tape tension detection means by varying the gain, and motor drive means that drives and controls the motor to keep the tape tension constant based on the output of the variable gain amplification means. A tape running device characterized by: