JPH05109162A - Magnetic recording/reproducing device - Google Patents

Abstract

PURPOSE:To reduce a positional deviation in a longitudinal direction between a rotary head assembly and a magnetic tape at each movement. CONSTITUTION:The rotary quantity of a winding reel 8, for example, at the time of an unloading operation, is measured by a rotary number measuring device 11 provided on the winding reel 8. Then, before a loading operation or an eject operation for taking out a cassette is executed, the winding reel 8 is rotated in a reverse direction corresponding to the above-mentioned rotary quantity and returned.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a magnetic recording / reproducing device.

[0002]

2. Description of the Related Art A conventional magnetic recording / reproducing apparatus will be described with reference to FIGS. FIG. 3 shows the magnetic tape 2 in the cassette 1.
Is wound around the rotary head assembly 4 by the tape guide 3, pulled by the capstan motor 5 and the pinch roller 6, sent out from the supply reel 7, and wound around the take-up reel 8.
Recording and reproduction of signals are performed in this loading state. FIG. 4 shows an unloading state in which the tape guide 3 is moved and stored in the cassette 1. In this unloading state, fast forward, rewind, and eject operations are performed. Pulling out the magnetic tape 2 by the tape guide 3 from the unloading state of FIG. 4 and winding it around the rotary head assembly 4 as shown in FIG. 3 is called a loading operation. Further, the tape guide 3 enters the cassette 1 from the loading state of FIG. 3, the magnetic tape 2 is wound up by the supply reel 7 and accommodated in the cassette 1 as shown in FIG.

In the figure, reference numerals 9 and 10 denote rotation speed measuring devices provided on the supply reel 7 and the take-up reel 8, respectively, and measure the rotation speeds of the supply reel 7 and the take-up reel 8 while the magnetic tape 2 is running. By doing so, the remaining amount of the magnetic tape 2 is calculated, and when the rotation speed measuring device 10 provided on the take-up reel 8 does not detect the rotation while the magnetic tape 2 is being pulled by the capstan motor 5, the magnetic tape 2 runs. As a deficiency, the operation is stopped.

[0004]

Since the conventional magnetic recording / reproducing apparatus is constructed as described above, if the supply reel 7 is frequently wound during the unloading operation, the magnetic tape wound on the take-up reel 8 will be described. Up to 2 supply reels 7
Will be wound up on the side. Therefore, when recording is performed by the next loading operation, the previous recording end point and the next recording start point deviate by the amount taken up on the supply reel 7 side during the unloading operation, and the previous recording is performed. There was a problem that recording was performed from above the part and the previous recording was erased.

The present invention has been made in order to solve the above problems, and magnetic recording / reproducing can be performed with high accuracy without shifting the position of the magnetic tape wound around the rotary head assembly even if the loading and unloading operations are repeated. The purpose is to obtain the device.

[0006]

A magnetic recording / reproducing apparatus according to the present invention measures a previous unloading operation before performing a loading operation of winding a magnetic tape around a rotary head assembly or an ejecting operation of taking out a cassette. The take-up reel is rotated and returned at a rotation amount corresponding to the rotation amount of the take-up reel.

[0007]

In the present invention, since the amount of rotation of the take-up reel during the previous unloading operation is measured, even if the loading and unloading operations are repeated,
The position of the magnetic tape wound around the rotary head assembly becomes almost constant.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic diagram showing a loading state, and FIG. 2 is a schematic diagram showing an unloading state. The same or corresponding parts as those of the conventional device are designated by the same reference numerals and the description thereof will be omitted. In the figure, 11 is a rotation speed measuring device provided on the take-up reel 8, and 12 is a storage device connected to the rotation speed measuring device 11.

First, during the unloading operation, the supply reel 7 is rotated counterclockwise to wind up the magnetic tape 2 and establish the unloading state. At this time, as the magnetic tape 2 moves, the take-up reel 8 also rotates counterclockwise. The amount of rotation is measured by the rotation speed measuring device 11, and the amount is stored in the storage device 12. Next, for example, when performing a loading operation, the take-up reel 8 is rotated clockwise and returned with an amount of rotation that matches the amount of rotation of the take-up reel 8 stored in the storage device 12 in the unloading state. When the loading operation is performed in this manner, the positional relationship of the magnetic tape 2 in the longitudinal direction with respect to the rotary head assembly 4 in the loading state becomes substantially the same as that in the previous loading state.

[0010]

As described above, according to the present invention, even if the loading and unloading operations are repeated, the position of the magnetic tape wound around the rotary head assembly can be accurately maintained without being displaced.

[Brief description of drawings]

FIG. 1 is a schematic view of a loading state showing an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an unloading state in FIG.

FIG. 3 is a schematic view of a conventional apparatus in a loading state.

FIG. 4 is a schematic diagram showing an unloading state in FIG.

[Explanation of reference numerals] 1 cassette 2 magnetic tape 3 tape guide 4 rotary head assembly 5 capstan motor 6 pinch roller 7 supply reel 8 take-up reel 11 rotation speed measuring device 12 storage device

Claims (1)

[Claims] 1. A rotary reel assembly comprising: a supply reel; a take-up reel which is paired with the supply reel; and which has a rotation speed measuring device; and a rotary head assembly having a magnetic head. A magnetic recording / reproducing apparatus in which a loading operation of winding around a magnetic tape and an unloading operation of separating a magnetic tape from the rotary head assembly while winding the magnetic tape by the supply reel are performed, and a rotation amount of the winding reel rotated during the unloading operation. Is measured by the rotation number measuring device, and then the winding reel is rotated and returned at a rotation amount corresponding to the rotation amount of the take-up reel before performing a loading operation or an ejecting operation for taking out the cassette. A magnetic recording / reproducing apparatus characterized in that