JPH04222948A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To improve the accuracy of tape tension and to easily and smoothly shift to a normal mode or a reverse mode by detecting the pressure applied to a loading post and a rotary post, and controlling a supply reel and a take-up reel. CONSTITUTION:The tension of a magnetic tape 12 on the entrance side of a rotating drum 1 controls the take-up force of the supply reel 9 according to information from a pressure sensor in the loading post 2 so as to keep the tension constant. The tension of the magnetic tape 12 fed from a capstan shaft 6 controls the take-up reel 10 according to information from the pressure sensor in a rotating post 8 so that tape take-up tension may be kept constant. Thus, the accuracy on the entrance side of the drum 1 is improved and the component parts of a mechanism such as a tension arm or a spring are reduced.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording and reproducing apparatus having a magnetic tape tension detection function.

0002

2. Description of the Related Art In recent years, VTRs have been enriched in both functionality and performance, and reel control by a two-reel motor has become indispensable for business-use VTRs in order to speed up mode transitions.

A conventional magnetic recording/reproducing device will be explained below. As shown in FIG. 2, there are loading posts 3 and 13 for winding the magnetic tape 12 around the rotating drum 1, an A/C head 4, and a pinch roller for pressing the magnetic tape 12 onto a capstan shaft 6 that sends out the magnetic tape 12. 7 and a rotating post 13 that stabilizes running. The cassette 11 houses a take-up reel 10 for winding up the magnetic tape 12 fed out by the capstan shaft 6, and a supply reel 9 for feeding out the magnetic tape 12. The tension of the magnetic tape 12 on the input side of the rotary drum 1 is controlled by a tension arm 14 and a spring 15, and the position of the tension arm 14, that is, the tension of the magnetic tape 12 on the input side of the rotary drum 1 is detected by a photo sensor 16 as an electrical signal. It is a configuration that changes to 17 is a post that stabilizes running.

The operation of the magnetic recording/reproducing apparatus constructed as described above will be explained below. The tension of the magnetic tape 12 on the entry side of the rotary cylinder 1 is determined by the balanced position of the tension arm 14 and the spring 15. In other words, the tension of the magnetic tape 12 can be changed depending on the position of the tension arm 14. The tension of the magnetic tape 12 can be kept constant by converting the position of the tension arm 14 into an electric signal using the photosensor 16 and controlling the electric signal to be constant.

Further, the winding tension of the take-up reel 10 is determined by the counting ratio of the pulse proportional to the rotation of the capstan shaft 6 and the reel pulse proportional to the rotation of the take-up reel 10. Winds with constant tension regardless of diameter.

[0006]

However, in the above-mentioned conventional configuration, the tension of the magnetic tape on the input side of the rotating drum is formed by the balanced position of the tension arm and the spring, so that the tape runs from the forward direction to the reverse direction. ,or,
When transitioning from the reverse direction to the forward direction of tape running, it is necessary to change the position of the tension arm, and there is also a loss of running of posts other than the tension arm, so the accuracy of the tension of the magnetic tape on the entry side of the rotating drum is said to be poor. It had some problems.

The present invention solves the above-mentioned conventional problems, and improves the precision of the tension of the magnetic tape on the entrance side of the rotating drum, thereby making it easy and smooth for the mode transition between the forward and reverse directions. The purpose is to provide a recording/playback device.

[0008]

[Means for Solving the Problems] In order to achieve this object, the magnetic recording and reproducing apparatus of the present invention includes a loading post having a means for detecting the pressure of the magnetic tape applied to the post and controlling a supply reel; The apparatus includes a rotating post having means for sensing the pressure of the magnetic tape and controlling the take-up reel.

[0009]

[Operation] With this configuration, the pressure of the magnetic tape applied to the post for winding the magnetic tape around the rotating drum is detected.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1 showing an embodiment of the present invention, parts that are the same as those in the conventional example are given the same numbers and their explanations will be omitted.

As shown in FIG. 1, 2 is a loading post having means for detecting the pressure of the magnetic tape 12 applied to the post and controlling the winding force of the supply reel 9 based on the detected information; 5 is a fixed post; 8 is a loading post; is a rotating post having means for detecting the pressure of the magnetic tape 12 applied to the post and controlling the take-up reel 10 based on the detected information.

The operation of the magnetic recording/reproducing apparatus constructed as described above will be explained below.

In the normal reproduction state, the magnetic tape 12 is wound around the rotating drum 1 by the loading posts 2 and 3, and the magnetic tape 12 is wound around the rotating drum 1 by the loading posts 2 and 3.
Tension 2 controls the winding force of the supply reel 9 based on information from the pressure sensor in the loading post 2 so that the tension of the magnetic tape 12 is constant.

Next, the magnetic tape 12 fed by the capstan shaft 6 is taken up and the take-up reel 10 is controlled based on information from a pressure sensor in the rotary post 8 so that the tension of the take-up tape is constant.

As described above, according to this embodiment, by providing means for detecting the pressure of the magnetic tape on the post in the post for winding the magnetic tape around the rotating drum, the magnetic tape on the entrance side of the rotating drum is The accuracy of tension can be improved. Furthermore, mechanical components such as tension arms and springs can be reduced, and mode transition between the forward and reverse directions of the magnetic tape can be facilitated and smoothed.

[0017]

As described above, the present invention provides a loading post having means for detecting the pressure of the magnetic tape applied to the post and controlling the supply reel, and a loading post having means for detecting the pressure of the magnetic tape applied to the post and controlling the take-up reel. An excellent magnetic recording and reproducing device can be realized, which can reduce the number of mechanical components and improve the accuracy of the tension of the magnetic tape wound around the rotating drum, by having a configuration equipped with a rotating post having a means for It is.

[Brief explanation of the drawing]

FIG. 1 is a schematic front cross-sectional view showing the concept of the configuration of a magnetic recording/reproducing device according to an embodiment of the present invention.

[Fig. 2] A schematic front cross-sectional view showing the concept of the configuration of a conventional magnetic recording/reproducing device.

[Explanation of symbols]

1 Rotating drum 2 Loading post 4 A/C head 6 Capstan shaft 7 Pinch roller 8 Rotating post 12 Magnetic tape

Claims (1)

[Claims] Claim 1: A loading post comprising a rotating drum, an A/C head, a capstan shaft, and a pinch roller, and having means for detecting the pressure of the magnetic tape applied to the post and controlling a supply reel; A magnetic recording and reproducing device comprising a rotating post having means for detecting pressure on a magnetic tape and controlling a take-up reel.