JPS62192052A - Rotary head type magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce frictional resistance between a magnetic tape, and a rotary drum and a rotary head, by rotating the rotary drum in the travelling direction of the magnetic tape, in the rewinding time and the fast feeding time of the magnetic tape. CONSTITUTION:In the reproduction time, or the fast feeding time, etc., of the magnetic tape, a motor 12, receiving a forward rotation command, a performs a forward rotation (the travelling direction of the magnetic tape in the reproduction time). However, in the rewinding time, the motor 12, by receiving a backward rotation command, performs a backward rotation. At such a time, a rotary drum 13(28) rotates in the same direction as the travelling direction of the magnetic tape. By providing a circuit with rotates a motor reversely in the circuit which drives the rotary drum in such way, the frictional resistance between the rotary drum and the rotary head, and the magnetic tape in the rewinding time of the magnetic tape, can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary head type magnetic recording and reproducing apparatus that uses a magnetic tape as a recording medium to record and reproduce signals using a rotary head.

2. Description of the Related Art In recent years, in magnetic recording and reproducing apparatuses using rotary heads, such as video tape recorders, there has been an increasing demand for protection of magnetic tapes from damage to the magnetic tapes.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A conventional rotary magnetic recording and reproducing apparatus will be described below with reference to the drawings. FIG. 3 is a block diagram of a circuit for driving a rotating drum of a conventional device. 11 is a drive circuit, 12 is a motor, and 13 is a rotating drum. As is clear from this block diagram, since there is no command to instruct the rotation direction of the motor, the motor only rotates in a fixed direction according to the rotation command.

Problems to be Solved by the Invention FIG. 4 shows a conventional rotary head type magnetic recording and reproducing apparatus that rewinds a magnetic tape while the magnetic tape is in contact with a rotary head and a rotary drum. In Fig. 4, 21 is a supply reel, 22 is a magnetic tape, 23 is a take-up reel, 24 is a rotating drum, 26°26' is a rotating shaft, 26.26
' Loading tape guide post, 2nd, 27
' is a tilting post, and 28 is a motor that drives the rotating drum.

Further, the magnetic tape 22 is in contact with the rotating drum 24 at an angle θ. In this example, in which the traveling direction of the magnetic tape 22 and the rotating direction of the rotary drum 24 are the same during playback, the motor is driven even when rewinding the magnetic tape, as shown in the block diagram of FIG. The direction is the same as during playback. Therefore, as indicated by the arrow in FIG. 4, the rotating direction of the rotary drum is opposite to the running direction of the magnetic tape.

Therefore, the relative speed between the magnetic tape and the rotating drum and the rotating drum is determined by the magnetic tape running speed and the rotating head.

It becomes the sum of the rotation speed of ! Since it becomes difficult to form an air layer between the magnetic tape and the rotating drum, the coefficient of friction between the magnetic tape, the rotating drum, and the rotating head increases, and the frictional resistance also increases. As described above, the conventional rotary head type magnetic recording/reproducing apparatus has a problem in that the frictional resistance between the rotary drum and the rotary head and the magnetic tape is large.

Means for Solving the Problems In order to solve the above problems, the rotation-hood type magnetic recording and reproducing apparatus of the present invention rotates a rotating drum in the running direction of the magnetic tape during rewinding and fast forwarding of the magnetic tape. It has a configuration.

Effect of the present invention With the above-described configuration, the rotating drum rotates in the magnetic tape running direction during rewinding and fast forwarding of the magnetic tape, and as a result, the relative speed between the rotating drum and the rotating head and the magnetic tape is slower than before, and the magnetic A layer of air tends to form between the tape and the rotating drum. Therefore, it is possible to reduce the frictional resistance between the magnetic tape and the rotating drum and between the rotating drum and the rotating drum.

Embodiment Hereinafter, a rotary head type magnetic recording/reproducing apparatus according to an embodiment of the present invention in which the running direction of the magnetic tape and the rotating direction of the rotary drum are the same will be described with reference to the drawings.

FIG. 1 is a block diagram of a circuit for driving a rotating drum of a video tape recorder according to an embodiment of the present invention. Also the second
The figure shows its specific configuration. 11 is a drive circuit, 12 is a motor, 13 is a rotating drum, 21 is a supply reel, 22 is a magnetic tape, 23 is a take-up reel, 24 is a rotating drum, 2
5.26' is the rotating head, 26.26' is the loading tape post, 27.27' is the inclined post,
28 is a motor that drives the rotating drum.

The operation of the rotary head type magnetic recording/reproducing apparatus constructed as described above will be described below with reference to FIGS. 1 and 2.

First, FIG. 1 shows a block diagram of a rotary drum drive circuit. During magnetic tape reproduction, fast forwarding, etc., the motor rotates in the normal direction (in the magnetic tape running direction during reproduction) in response to a normal rotation command. However, during rewinding, all reverse commands cause the motor to reverse. At this time, as shown in FIG. 2, the rotating drum rotates in the same direction as the magnetic tape running direction.

As described above, according to this embodiment, by providing a circuit for reversing the motor in the circuit that drives the rotating drum, it is possible to reduce the frictional resistance between the rotating drum, the rotating head, and the magnetic tape when rewinding the magnetic tape. I can do it.

Effects of the Invention As described above, according to the present invention, in a rotating head type magnetic recording/reproducing device in which the rotating drum and the magnetic tape come into contact with each other during rewinding and fast forwarding of the magnetic tape, the rotation of the rotating drum during rewinding and fast forwarding of the magnetic tape is controlled. By making the direction the same as the running direction of the magnetic tape, an excellent effect of reducing the frictional resistance between the rotating drum and the rotating head and the magnetic tape can be obtained. Moreover, the effects extend beyond reducing damage to the magnetic tape to reducing the capacity of the reel motor and the capacity of the power supply.

Furthermore, the present invention does not require a complicated circuit and can be easily implemented using only a circuit that switches the polarity of the motor.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of a circuit for driving a rotating drum of a rotary head type magnetic recording/reproducing device according to an embodiment of the present invention, Fig. 2 is a plan view of the same main part, and Fig. 3 is a conventional rotary head type magnetic recording/reproducing device. FIG. 4 is a block diagram of a circuit for driving a rotating drum of the recording/reproducing apparatus, and is a plan view of the main parts thereof. 11... Drive circuit, 12... Motor, 13
... Rotating drum, 21 ... Supply reel, 22 ... Magnetic tape, 23 ... Winding reel, 24 ... Rotating drum, 25.25 '...
...To rotation, throat, 26.26'...Loading tape guide post, 27.27'...
Inclined post, 28...Motor. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Fig. 2f--Ippuku t-i sole 22-Sulfur t-7' 23-4℃ reel

Claims (1)

[Claims] A rotary head type magnetic recording and reproducing device in which a rotating drum and a magnetic tape come into contact with each other during rewinding of a magnetic tape, the rotary drum being rotated in the running direction of the magnetic tape during rewinding and fast forwarding of the magnetic tape. Device.