JPH0652563B2 - Rotating head drum device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary head drum device used in a video tape recorder.

2. Description of the Related Art In recent years, in a rotary head drum device of a video tape recorder, recording and reproduction are performed by bringing a magnetic tape into contact with a rotary magnetic head and exchanging signals.
Hereinafter, the conventional rotary head drum device described above will be described with reference to the drawings.

6 (a) and 6 (b) are a plan view and a side view of a conventional rotary head drum device. In FIG. 6, 1 is an upper drum, and 2 is a magnetic head which is fixed to the upper drum 1 and rotates together. 3 is a lower drum, 4 is a magnetic tape, an upper drum 1,
It is in a state of being obliquely wound around the lower drum 3. 5,
Reference numeral 6 is a loading member for winding the magnetic tape 4 around the upper drum 1 and the lower drum 3, and includes inclined posts 7 and 8, and 9,
10 rotating posts are arranged.

The operation of the conventional rotary head drum device configured as described above will be described below.

First, FIG. 6 shows a state in which the loading members 5 and 6 are slid on a predetermined guide (not shown) while applying the magnetic tape 4 and are regulated at a position where an appropriate wrapping angle can be maintained. As described above, the magnetic tape 4 is wound obliquely around the upper drum 1 and the lower drum 3 to form a so-called helical scan structure. Further, in this case, the magnetic head 2 comes into contact with the magnetic tape 4 as it rotates and exchanges signals, so that the recording and reproducing functions occur.

Problems to be Solved by the Invention However, in the above configuration, the magnetic tape 4 and the magnetic head 2 are in contact with each other within the winding angle range, and the lower edge portion of the upper drum 1 on the side where the magnetic head 2 is fixed is also. Since the air film generated by the rotation is insufficient, it comes into contact with the magnetic tape 4. Therefore, a small amount of magnetic powder of the magnetic tape 4 is released and adheres to the magnetic head 2 or the lower edge portion of the upper drum 1 or a notch for exposing the magnetic head 2, or dust is not limited to the magnetic powder. When the magnetic tape 4 and the magnetic head 2 do not normally exchange signals due to adhesion, recording and reproduction become impossible, or the magnetic tape 4 is disturbed by the adhered substances such as magnetic powder to disturb the precise running of the magnetic tape 4. There is a problem that wow increases and the screen is disturbed, and in that case, there is a problem that the magnetic head 2, the upper drum 1 and the like need to be cleaned by a complicated procedure.

In view of the above problems, the present invention provides a rotary head drum device which has a simple and inexpensive structure and is capable of automatically cleaning a magnetic head and a drum unit.

Means for Solving the Problems In order to solve the above problems, a rotary head drum device of the present invention comprises a drum unit including a rotary drum and a lower drum, which is equipped with a magnetic head and runs a magnetic tape. A rotating member having elasticity and including a soft material,
A spring for restricting the rotating member in one direction, a holder having a protrusion facing a part of the rotating member, supporting the rotating member, and being fixed to the drum unit; And a winding member having a post for winding the drum unit.

With the above-described structure, the present invention allows the magnetic head, the upper drum, etc. to be contacted with the soft material for a certain period while the magnetic tape is wound around the drum unit or released, thereby automatically cleaning the magnetic head, the upper drum, etc. You can do it.

Embodiment Hereinafter, a rotary head drum device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing the configuration of an embodiment of the present invention. In FIG. 1, a rotating member 11 is made of an elastic body such as a metal spring and can be rotated around a central portion as an axis. A roller 12 is made of a soft material such as felt and is supported by one end of the rotating member 11. Further, the soft material 12 is arranged at a height capable of contacting the magnetic head 2. Reference numeral 13 denotes a plate-shaped holder which is fixed to the lower drum 3 and holds the rotating member 11. 14 is a coil spring, 15
Are protrusions provided on the holder 13 and facing each other at a position above the center of the rotating member 11 in the width direction. Coil spring 14
Is connected near the support portion of the soft material 12 of the rotating member 11 at one end, and the other end is connected to the pin 16 protruding from the holder 13, and normally the soft material 12 is pulled in a direction away from the upper drum 1 and the lower drum 3. There is.

Next, FIGS. 2 and 3 are plan views and a side view of a main portion of the present embodiment during operation, and FIGS. 4 and 5 are a plan view and a side view of a completed state of the operation. It is a figure. The operation of the rotary head drum device configured as described above will be described below.

First, in FIG. 2 and FIG. 3, the loading members 5 and 6 are shown just before or just after the winding of the magnetic tape 4, that is, a state slightly separated from the predetermined winding completion position. Is brought into contact with a part of the loading member 6 and is urged into a rotating state to bring the soft material 12 into contact with the upper drum 1 and the magnetic head 2. At this time, since the upper drum 1 is rotating, a certain period, that is, rotation. A cleaning action occurs while the moving member 11 and the loading member 6 are in contact with each other. Further, FIGS. 4 and 5 show the state in which the winding of the magnetic tape 4 is completed, and the rotating member is pressed by the loading member 6 by a stronger biasing force, but at the same time the rotating member is rotated together with the protrusion 15. Since the member 11 comes into contact and the reaction force of the projection 15 is exerted on a position deviated from the center of the rotating member 11 in the width direction, the rotating member 11 is twisted, and as a result, the soft material 12 is generated.
The central axis of the soft material 12 is also inclined and the soft material 12 is separated from the upper drum 1, the magnetic head 2 and the like.

As described above, according to the present embodiment, an effective cleaning function can be exhibited by providing the soft material 12 and contacting the drum unit only for a certain period while the magnetic tape 4 is being wound or released. Also, the complete winding state or recording,
Since the non-contact state is maintained at the time of reproduction or at the time of stop, the fear of damage to the magnetic head 2 due to excessive contact, abrasion of the soft material 12, or adhesion to the drum unit is eliminated.

It should be noted that the rotating member 12 can be of any shape and material as long as the function of the lever is generated, the contact time with the magnetic head 2 and the drum unit can be freely adjusted, and the soft material 12 is also a sponge or brush-like member. Various soft rubbers are conceivable, and even in the roller shape of this embodiment, the cleaning effect is increased because the relative motion component in the rotation axis direction is generated by inclining the rotation axis with respect to the rotation axis of the upper drum 1. The shape of the soft material 12 is not limited to the roller shape, and various shapes such as a spherical shape and a barrel shape can be considered.

As described above, according to the present invention, it is possible to automatically clean the magnetic head and the drum with a relatively easy and simple structure, and it is possible to obtain an excellent effect that the complicated work is released. it can.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a plan view showing the middle of the operation of the embodiment, FIG. 3 is a side view of an essential part at that time, and FIG. 4 is an operation of the embodiment. Plan view showing the completion time, No. 5
FIG. 6 is a side view of a main part at that time, and FIGS. 6 (a) and 6 (b) are a plan view and a side view of a conventional rotary head drum device. 1 ... Upper drum, 2 ... Magnetic head, 11 ... Rotating member, 12 ... Soft material, 15 ... Protrusion.

Claims (1)

[Claims] 1. A drum unit comprising a rotating drum having a magnetic head for running a magnetic tape and a lower drum, an elastic rotating member having a soft material at one end, and the rotating member. A spring for regulating the direction, a holder having a protrusion facing a part of the rotating member and supporting the rotating member and fixed to the drum unit, and for winding the magnetic tape around the drum unit. A winding member having a post, the rotating member is disposed so as to face a non-winding portion of the magnetic tape of the drum unit, and one end different from the one in which the soft material is disposed is the winding member. The soft member on the rotating member comes into contact with the rotating magnetic head of the drum unit by being biased into a rotating state by urging a part of the rotating member and the magnetic tape for a certain period during winding or releasing of the magnetic tape. ,Magnetic tape Times of the end state is biased by the projection on the holder, the torsion is generated in the rotating member, the rotary head drum apparatus in which the soft material is characterized by being configured so as to leave from the magnetic head.