JPH0316709B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a cartridge type recording/reproducing machine having two tape pull-out mechanisms and a tape tension detection device provided on one of the tape pull-out mechanisms, and particularly relates to The present invention relates to a cartridge type magnetic recording/reproducing machine using a video magnetic tape cartridge.

(b) Prior Art and Problems Conventionally, in a cartridge type recording/reproducing machine, for example, as shown in FIG. Rotate to . The tape 5 is pulled out from the tape cartridge 6 with the tape guide 2 on the arm 1 in contact with the tape 5 by rotation of a pair of tape pull-out mechanisms 3, 3'. The pair of tape pull-out mechanisms 3, 3' are rotated by one motor, and the tape 5 is pulled out to the final tape pull-out position shown in the figure. Note that 7 is a fixed guide, 8 is a fixed head for recording and reproducing, and 9 is a tape guide inside the cartridge.

The tape 5 is run in the state of the tape pull-out position, and recording and reproduction are performed by the fixed head. At this time, in order to control the tension of the running tape 5 at a constant level, a tape tension detection device 1 is installed on one side 3' of the tape pull-out mechanism to detect the tape tension in the tape running state.
0 is set. Also, of course when fast forwarding tape 5,
In order to prevent the tape 5 from running out of control, the tape tension is controlled to be constant by the tape tension detection device 10.

The tape tension detection device 10 attached to the tape pull-out mechanism 3' has a potentiometer 11 attached to the shaft 12 as the center of rotation.
3 is a balanced detection device (controls the reel motor based on displacement detection information) so that the tension is constant. Further, the position of the tape tension detection device was different during recording/reproduction and during fast forwarding. It consists of the two tape pull-out mechanisms 3,
3' is driven by one drive source (motor), so in order to fast-forward the tape 5, one (left side of the figure) tape pull-out mechanism 3 is returned to the original tape cartridge 6 as shown by the dotted line. If the tape 5 is prevented from touching the tape guide 2 of the returned tape pull-out mechanism 3 to prevent damage to the tape 5, the other tape pull-out mechanism 3' (on the right side of the figure) will also move as shown by the dotted line. (preventing this requires a very complicated mechanism). As a result, the angles A and B that the tape 5 makes with the tape guide 2 during recording and playback and during fast forwarding are A<B, so the tape tension measured by the tape tension detection device 10 is smaller in the case of B. However, since it is difficult to detect minute tension changes, there is a problem in that the performance of the tape tension detection device changes.

(c) Object of the Invention The object of the present invention is to improve the performance of the tape tension detection device by not changing the position of the tape tension detection device both during recording and playback and during fast forwarding. The objective is to provide a cartridge type recording/reproducing machine that does not change.

(d) Structure of the Invention In order to achieve the above object, the present invention, as illustrated in FIG. Tape pull-out mechanism 3,
3', the tape 5 is pulled out to the tape pull-out position, and recording and playback are performed.
A cartridge-type recording/reproducing machine is equipped with a tape tension detection device 10 on one side 3' of the tape pull-out mechanism for detecting the tape tension in the running state, and a device that enables fast forwarding of the tape 5. The drive source of the tape pull-out mechanisms 3 and 3' is configured separately, and the tape pull-out mechanism 3 which is externally powered during tape fast forwarding is returned to the tape cartridge 6 side, and the tape pull-out mechanism is equipped with a tape tension detection device 10. 3' is not driven, and a tape path is formed so that the tape tension detection device 10 is located at the same position as the recording/reproducing position.

(e) Examples of the invention Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a diagram for explaining the cartridge type recording/reproducing machine according to this embodiment.

In the figure, the cartridge type recording and reproducing machine of this embodiment uses separate drive sources to drive the tape pull-out mechanisms 3 and 3' of the conventional cartridge type recording and reproducing machine shown in FIG. The other parts are the same as those in FIG. 1, the symbols are used as they are, and the explanation is omitted.

The two tape pull-out mechanisms 3 and 3' are driven by a drive source, the tape 5 is pulled out from the tape cartridge 6, and the tape is brought to the tape pull-out position shown by the solid line in the figure where it is in contact with the fixed head 8 and the fixed guide 7, and recording and playback is performed. It will be done. The tape tension detection device 10 that detects the tape tension at this time is located at the position shown by the solid line.

When fast forwarding the tape at the tape pull-out position, one of the tape pull-out mechanisms 3 is driven to return it to the position shown by the dotted line, so that the tape 5 is not stretched over the tape guide 2 attached to the tape pull-out mechanism 3. The other tape pull-out mechanism 3' is left in the same position without being driven.

At this time, the position of the tape tension detection device 10 does not move from the position at the time of recording and reproduction. Therefore, there is almost no difference in angle between the angle B' at which the tape 5 is stretched over the tape guide 2 during tape fast forwarding and the angle A at which the tape 5 is stretched over the tape guide 2 during recording and reproduction.

Therefore, the performance of the tape tension detection device is almost the same between recording and playback and fast forwarding.

Therefore, a tape path with stable tape tension can be obtained.

FIG. 3 is a diagram comparing the present invention and a conventional example.

As shown in FIG. 3, the angle at which the tape 5 is stretched over the tape guide 2 is
B' and conventionally B, it is clear that B'<B.

That is, since the tape tension of the present invention is larger, it can be seen that it is easier to detect minute changes in tape tension in the present invention.

Therefore, stable tape tension control can be performed.

(f) Effects of the Invention As explained in detail above, the cartridge type recording/playing device of the present invention does not change the position of the tape tension detection device during recording/playback or fast forwarding, so it can operate like a conventional tape path. This prevents the performance of the tape tension detection device from changing during playback and fast forwarding, and provides a tape path with stable tape tension.

[Brief explanation of the drawing]

Fig. 1 is a diagram for explaining a conventional tape path, Fig. 2 is a diagram for explaining an embodiment of a cartridge type recording/reproducing machine according to the present invention, and Fig. 3 is a diagram for explaining an embodiment of the present invention and a conventional example. FIG. 2 is a diagram for explaining a comparison. In the figure, 1 is an arm, 2 is a tape guide,
3 and 3' are tape pull-out mechanisms, 4 is a fulcrum shaft, and 5
1 is a tape, 6 is a tape cartridge, 7 is a fixed guide, 8 is a fixed head, 9 is a guide pin, 10 is a tape tension detection device, 11 is a potentiometer, 12 is a shaft, and 13 is a spring.

Claims (1)

[Claims] 1. A pair of tape pull-out mechanisms 3 and 3' for pulling out the tape 5 from the tape cartridge 6;
driving the pair of tape pull-out mechanisms 3, 3';
A tape tension detection device 10 is provided on one side 3' of the tape pull-out mechanism for recording and reproducing the tape 5 while pulling the tape 5 to the tape pull-out position and detecting the tape tension in the running state of the tape 5. In a cartridge-type recording/reproducing machine equipped with a device capable of fast-forwarding as shown in FIG. The tape is returned to the tape cartridge 6 side, and the tape is pulled out so that the tape tension detection device 10 is at the same position as the recording/playback position without driving the tape pull-out mechanism 3' equipped with the tape tension detection device 10. A cartridge type recording/reproducing machine characterized by forming a path.