JPH02273362A - magnetic recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic recording/reproducing device such as a VTR, and more specifically, to a magnetic recording/reproducing device equipped with a mechanism for winding a magnetic tape around a magnetic spatula 1. The present invention relates to a playback device.

(Prior Art) A conventional magnetic recording/reproducing device will be explained with reference to FIG. This figure is an enlarged plan view of a main part showing a mechanism for winding a magnetic head. A magnetic tape 2 is wound around a magnetic head 1 at a predetermined angle and run, and recording and reproduction are performed on the magnetic tape 2. A rotating arm 4 rotatably supported by a support shaft 3 provided on a base has a tape post 5 implanted at its tip in contact with the magnetic tape 2 described above. A fan-shaped gear portion 4a is formed at the end of the rotating arm 4, concentrically with the support shaft 3 described above. The gear portion 4a is driven by an electric motor via a reduction gear (not shown), and rotates the rotating arm 4 between a position shown by a dashed line and a position shown by a solid line. This rotation causes the tape post 5 to wrap or separate the magnetic tape 2 from the magnetic head 1. Note that a fixed post 6 is provided on the opposite side of the tape post 5 in order to secure the amount of magnetic tape winding around the magnetic head 1.

(Problem to be Solved by the Invention) However, in the above configuration, when the rotating arm 4 rotates and stops winding the magnetic head 1 at a predetermined position, if the stopping position deviates, the rotation arm 4 rotates and winds the magnetic head 1 at a predetermined position. The amount of magnetic tape wrapping varies greatly.

There has been a problem in that the contact of the magnetic tape 2 with the magnetic head 1 is insufficient, resulting in a spacing loss that lowers the level of high frequency components, large level fluctuations, or recording/reproduction failures.

Therefore, in order to adjust the stop positions of tape posts 1 to 5, a position detection sensor, etc. that detects the stop position and stops the lψ motor is required, which not only increases the number of parts but also takes time to adjust. There was also the problem that the cost was high.

The present invention solves the above problems and provides a magnetic recording/reproducing apparatus having a magnetic tape winding mechanism that does not require highly accurate stop position adjustment.

(Means for Solving the Problems) In order to solve the above problems, the present invention rotates the rotating arm so that the magnetic tape is wound around the magnetic head in a predetermined position, and then rotates the tape post. The support shaft of the rotating arm is moved from the center to the normal line -11 of the common tangent between the magnetic head and the tape post and the point of contact between the tape post 1 and the tape post.

(Function) With the above configuration, even if the rotary arm is slightly misaligned, the amount of winding around the magnetic head hardly changes, so there is no need to adjust the stop position of the tape post or use a position detection sensor. Therefore, an inexpensive magnetic recording/reproducing device with a small number of parts and no adjustment required can be obtained.

(Example) An example of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a plan view showing a magnetic tape I-winding mechanism according to the present invention, showing a state in which a magnetic tape 2 is wound around a magnetic head 1 at a predetermined position.

Note that the same components as in the conventional example shown in the third garden are given the same reference numerals and the explanation will be continued.

The rotating arm A4 rotates clockwise around the support shaft 3a from the standby position indicated by the dashed line, and the winding arm A4 moves to the position indicated by the broken line =4, and further moves the center of the tape post 5. Turn the support shaft 3 clockwise around the center, and rotate the support shaft 3 on the common tangent of the magnetic spatula 1 < 1 and the tape post 5 to the tape post 1, and the normal to the contact point 7 of the tape post 1-5, as shown in Figure 2. and stop at the recording/playback position. FIG. 1 shows this situation.

In the above embodiment, the two rotations of the rotation arm \4 were performed sequentially, but they may be rotated simultaneously, and the trajectory of the tape post 5 at that time is the same as that of the support shaft 3 at the recording/reproducing position.
A circle gAa drawn at the center of the tape post 5, centering on the center point A, and centering on the center point B of the support shaft 3a in the standby position,
It falls within the hatched area between the arcs drawn at the center of the tape post 5.

As shown in FIG. 1, since the magnetic tape 2 runs on a common tangent to the magnetic head 1 and tape post 5, the positional error of the rotating arm tz 4 has no effect on the amount of winding of the magnetic tape 2. It will be extremely small.

In addition, in this embodiment, the rotation arm A/1 is supported by 1llllll.
13 in the hourly direction and winding it around the magnetic head 1, however, it rotates counterclockwise and the magnetic spatula l<
Even if the structure is wound around 1, it can be realized by positioning the center of the support shaft 3 at the recording/reproducing position at A.

(Effects of the Invention) As described above, according to the present invention, a predetermined winding around a magnetic head can be reliably achieved without performing highly accurate position adjustment. Furthermore, an inexpensive and high-quality magnetic recording/reproducing device with a small number of component parts can be obtained.

[Brief explanation of drawings]

Fig. 1 is a plan view of the tape winding mechanism of the magnetic head in the magnetic recording/reproducing apparatus according to the present invention, Fig. 2 is a plan view showing the locus range of the center of the tape post during rotation, and Fig. 3 is a plan view of the tape winding mechanism of the magnetic head in the magnetic recording/reproducing device of the present invention. FIG. 2 is a plan view of a mechanism for winding a tape around a magnetic head in a recording/reproducing device. ] ・Magnetic head, 2 ・Magnetic tape, 3.3a
Support shaft, 4. Rotating arm 11.4 a Gear part, 5. Tape post I~, 6. Fixed boss 1-
57 - Contact point between the common tangent of the magnetic head and tape post and the tape post.

Claims (1)

[Claims] A magnetic tape, a magnetic head that records and plays by winding the magnetic tape at a predetermined angle, and are rotatably supported on a support shaft.
In a magnetic recording/reproducing device, the rotary arm is equipped with a tape post at its tip that contacts the magnetic tape and wraps around the magnetic head. Wrap the specified amount,
A magnetic recording and reproducing device characterized in that, when stopped at a recording and reproducing position, the support shaft is located on a common tangent between the magnetic head and the tape post and a normal line erected at the point of contact with the tape post.