JPS62285215A - Rotary head cleaning mechanism - Google Patents

Abstract

PURPOSE:To clean a rotary head automatically by providing a cleaning member elastic contact means and a cleaning member elastic contact release means. CONSTITUTION:With a catcher 8 not butted with a tape guide 4, a cleaning member 22 is in elastic contact onto a peripheral of a rotary drum 2 by a spring force of a cleaning member hold spring 19 to allow the cleaning member 22 to clean the rotary head 3 at unloading/loading. When the tape guide 4 reaches a position butted by the catcher 8, a lock piece 17 is depressed by a lower flange of the tape guide 4 to drive a release lever 13, resulting that the vicinity of the support end of the cleaning member of a cleaning member holding spring 19 is depressed by a release pin 18 of the other end of the release lever 13 to move the cleaning member 22. Thus, the cleaning member 22 in elastic contact with the peripheral of the rotary drum 2 is parted from the rotary drum 2.

Description

[Detailed description of the invention] 3. Detailed description of the invention The present invention will be described in the following order.

A. Industrial field of application B1 Overview of the invention C1 Prior art Problems to be solved by the invention [Fig. 4] E0 Means for solving the problems F1 Effects G. Examples [Figs. Figure 3 H0 Effects of the Invention (A, Industrial Field of Application) The present invention provides a video tape recorder having a rotating head cleaning mechanism, particularly a tape loading mechanism that automatically winds a video tape around a rotating drum when a tape cassette is loaded. The present invention relates to a rotary head cleaning mechanism for cleaning a rotary head.

(B. Summary of the Invention) The present invention relates to a rotary head cleaning mechanism for cleaning a rotary head of a video tape recorder having a tape loading mechanism that automatically winds a video tape around a rotary drum when a tape cassette is loaded.

In order to automatically clean the rotating head when loading (installing) or unloading (ejecting) a tape without the user having to perform any special operations for cleaning the head, the cleaning member is attached to the outer surface of the rotating drum. The cleaning member elastic contact means for bringing the cleaning member into elastic contact with the rotary drum and the cleaning member elastic contact release means for releasing the cleaning member from contact with the outer circumferential surface of the rotating drum when the cleaning member is in the tape-loaded state are provided. According to the head cleaning mechanism, the cleaning member is in elastic contact with the rotating drum except when it is in the loading state, so the cleaning member automatically cleans the rotating head during loading and unloading. Can be cleaned. Therefore, the head is cleaned without any special operation being required. Furthermore, when the tape is loaded, the cleaning member elastic contact release means prevents the cleaning member from coming into contact with the rotating drum, so there is a risk that the rotation of the rotating head will be adversely affected by the cleaning member during recording and playback. There is no such thing.

(C, Prior Art) Since the rotating head of a video tape recorder scans the magnetic tape at high speed, magnetic powder from the magnetic tape tends to adhere to it, and dirt other than magnetic powder also tends to adhere to it.

If magnetic powder or the like adheres to the rotating head, it will have a considerable effect on recording and reproduction.

Therefore, a cleaning tape is stored in an ordinary tape cassette instead of a suitable video tape, and the cleaning tape cassette is installed in a video tape recorder.
There is a cleaning method that uses that tape to clean the head. There are two types of cleaning tape: dry type and wet type.

Further, a head cleaning mechanism is provided in the video tape recorder, and when the user operates the head cleaning mechanism, the cleaning member is brought into elastic contact with the outer peripheral surface of the rotating drum so as to be able to contact the rotating head. A rotating head cleaning technology was also developed in which the rotating head was cleaned by a cleaning member, and was published in U.S. Pat.
It has been published in Publication No. 7.

(D. Problem to be Solved by the Invention) [Figure 4] By the way, when cleaning using a cleaning tape, if the tape is a dry type, the sliding surface of the head a will be damaged as shown in Figure 4 (A). The same figure (
As shown in B), it can be removed cleanly, but stains C attached to other parts cannot be removed. Therefore, when the cleaning tape is ejected after cleaning and a regular cassette tape is loaded and recorded or played back, the dirt C that has accumulated on areas other than the moving surface will land on the video tape and even on the head, resulting in poor recording and This causes poor reproduction, etc., and good head cleaning cannot be expected. In addition, in the case of a wet type tape, cleaning liquid adheres to the rotating drum, tape guide, etc., which is not preferable because it causes problems such as staining or trouble in running the tape.

Furthermore, in the method of cleaning with a cleaning tape, there is a problem in that the head is not cleaned unless the user voluntarily purchases a cleaning tape and attempts to clean the head.

Therefore, there is a possibility that the low image quality due to lack of cleaning may be determined to be due to a defect in the video tape recorder itself.

Furthermore, according to the head cleaning mechanism in a video tape recorder introduced in Japanese Utility Model Application No. 60-127617, the rotary head is cleaned by the mechanism inside the video tape recorder, so there is no need to purchase a cleaning tape. , it is not necessary to attach it to a video tape recorder and put it into playback mode. In this respect, it can be said that it is less troublesome than the cleaning method using a cleaning table. However, even with such a head cleaning device, the cleaning operation will not be performed unless the user performs the cleaning operation, so if the user does not voluntarily perform the cleaning operation, the rotating head will remain dirty with magnetic powder etc. There was a risk.

The present invention has been made to solve these problems, and allows the user to clean the rotating head when loading (installing) or unloading (ejecting) the tape without performing any special operations for cleaning the head. The purpose is to automatically clean the

(E. Means for Solving Problems) In order to solve the above-mentioned problems, the rotating head cleaning mechanism of the present invention includes a cleaning member elastic contact means for bringing the cleaning member into elastic contact with the outer peripheral surface of the rotating drum, and a tape-loaded cleaning member. When the cleaning member is rotated 14'
The cleaning member is characterized by being provided with elastic contact release means for preventing the cleaning member from coming into contact with the outer circumferential surface of the ram.

(F. Operation) According to the rotating head cleaning mechanism of the present invention, since the cleaning member is brought into elastic contact with the rotating drum except when it is in the loaded state,
The rotary head rotating during loading and unloading can be automatically cleaned. Therefore, the head can be cleaned without any special operation being necessary. In addition, when the tape is completely loaded, the cleaning member elastic contact release means prevents the cleaning member from coming into contact with the rotating drum, so the rotation of the rotating head is adversely affected by the cleaning member during recording and playback. There is no risk of being affected.

(G. Embodiment) [FIGS. 1 to 3] Hereinafter, the rotary head cleaning mechanism of the present invention will be explained in detail according to the illustrated embodiment.

1 to 3 are for explaining one embodiment 1 of the rotary head cleaning mechanism of the present invention, and FIGS. 1(A) and 1(B) show the rotary head cleaning mechanism 1 in a tape loading completed state. , the same figure (A) is a front view,
3(B) is a plan view, FIG. 2 is a plan view showing the state of the rotary head cleaning mechanism 1 during loading or unloading (head cleaning), and FIGS. 3(A) to 3(C) ) is a plan view showing changes in the state of the tape loading mechanism of the video tape recorder.

In the drawing, 2 is a rotating drum, and 3 is a rotating head slightly protruding from the outer peripheral surface of the rotating drum 2. The rotating head 3 is cleaned by the rotating head cleaning mechanism 1.

Reference numeral 4 denotes a tape guide for guiding the video tape 5.

The tape guide 4 has a video cassette 6 written by W':c,
At t'L loading standby fg, as shown in FIG. 3(A), it is located on the back side of the video tape 5, which passes straight between the tape loading/unloading lower and 7 of the video cassette 6. When loading the tape, the tape moves straight in the direction indicated by the dashed arrow, and is stopped by the catcher 8 and remains there as shown in FIG. 3(B). This tape guide 4 is sometimes called a No. 2 guide to distinguish it from several other tape guides.

The catcher 8 is appropriately spaced from the rotating drum 2, and is located slightly inside (on the rotating drum side) of the position of the capstan 9 in the fully loaded r-shaped frame, and its position is fixed with a screw or the like. . 10 is catcher 8
This is an arc-shaped blocking recess. Reference numeral 11 denotes a support column, which is arranged slightly behind the midpoint of the straight line connecting the rotation center of the rotary head 3 and the catcher 8 when viewed from the cassette mounting side. Reference numeral 12 denotes a support post that is fitted around the substantially lower half of the support column 11.

13 is a release lever, which has a hole 14 in the middle part;
It is rotatably fitted onto the support column 11 at a position and supported by a support post 12. An annular projection 15 projecting upward is formed on the periphery of the hole 14 of the release lever 13.
A cleaning member holding spring, which will be described later, is supported on the protrusion 15 so as to be fitted onto the support column 11 . The release lever 13
One end has a locking piece 17 that is locked to the flange 16 of the tape guide 4, and the tip half of the portion of the release lever 13 on the side of the locking piece 17 from the hole 14 has a crank shape when viewed from the front side. It is bent. Further, at the other end of the release lever 13, a release pin 1 that is engaged with a cleaning member holding spring is provided.
8 is formed.

Reference numeral 19 denotes a cleaning member holding spring, which is made of steel and has a helical middle portion.The helical portion is fitted around the support column 11 and supported by the annular protrusion 15 of the release lever 13. 20 is a cleaning member holding spring 19
The locking piece 20 is formed by bending one end of the catcher 8, and is engaged with an engaging notch 21 formed on the side edge of the catcher 8, thereby fixing the position of the locking piece 20. Reference numeral 22 denotes a cleaning member made of deerskin (same leather), for example, which is attached to the other end of the cleaning member holding spring 19.

The cleaning member holding spring 19 is attached to the cleaning member 22
The annular protrusion 15 of the release lever 13 is fitted onto the support column 11 in a state in which it stores a rotational force that causes the release lever 13 to come into elastic contact with the rotating head 3.
supported above.

When the tape guide 4 is not blocked by the catcher 8, the cleaning member 22 is brought into elastic contact with the circumferential surface of the rotating drum 2 by the spring force of the cleaning member holding spring 19, as shown in FIG. It is being Since the rotating drum 2 is in a rotating state during loading or unloading, the rotating head 3 can be cleaned by the cleaning member 22 during loading or unloading.

By the way, as shown in FIG. 1, when the tape guide 4 is loaded and reaches the position where it is stopped by the catcher 8, the lock L jr 1 provided at one end of the release lever 13 is released.
7 is pushed by the lower flange 6 of the tape guide 4, and the release lever 13 cannot be rotated clockwise in FIG. 1(B). As a result, the release pin 1 at the other end of the release lever 13
8 pushes the vicinity of the cleaning member supporting end of the cleaning member holding spring 19, and the cleaning member 22 is moved to the left in FIG. 1(B). Therefore, the cleaning member 22 which had been brought into elastic contact with the outer peripheral surface of the rotating drum 2 is separated from the rotating drum 2. Therefore, during playback or recording as shown in FIG. 3(C), the release lever 13 prevents the cleaning member 22 from coming into elastic contact with the outer peripheral surface of the rotating drum 2. There is no possibility that the rotation of the rotary drum 2 during playback or recording will be adversely affected by the elastic contact.

According to such a rotary head cleaning mechanism 1, when a video tape cassette 6 is loaded or ejected, the rotary drum 2 rotates and the cleaning member 22 is brought into elastic contact with the outer peripheral surface of the rotary drum 2. Since the cleaning state shown in FIG. 2 is always achieved transiently, each time the videotape cassette 6 is loaded or ejected, the cleaning member 22 is automatically cleaned by the cleaning member holding spring 19, which is a cleaning member elastic contact means. The rotary head 3 is cleaned, and there is no need to attach a cleaning tape cassette for cleaning or to perform any special operation for cleaning as in the conventional case.

Since the cleaning member 22 is made of, for example, deer skin and can thoroughly clean the rotary head 3, dirt adhering to the sliding surface of the rotary head 2 can be completely removed, and more perfect cleaning can be expected. Can be done.

(H, Effects of the Invention) As described above, the rotating head cleaning mechanism of the present invention has a cleaning member elastic contacting means for bringing the cleaning member into elastic contact with the outer peripheral surface of the rotating drum so as to be able to come into contact with and separate from the rotating head protruding therefrom. and a cleaning member elastic contact release means which interlocks with the operation of the tape loading mechanism and prevents the cleaning member from contacting the outer peripheral surface of the rotating drum when the tape is loaded.

Therefore, according to the rotating head cleaning mechanism of the present invention,
Since the cleaning member is in elastic contact with the rotating drum except when it is in a loaded state, the cleaning member automatically cleans the rotating head during loading and unloading. be able to. Therefore, the head is cleaned without any special operation being required. In addition, when the tape is loaded, the cleaning member elastic contact release means prevents the cleaning member from coming into contact with the rotating drum, so the rotation of the rotating head is adversely affected by the cleaning member during recording and playback. No need to worry.

[Brief explanation of the drawing]

Figures 1 to 13 are for explaining one embodiment of the rotary head cleaning mechanism of the present invention, and Figure 1 is (A
) and (B) show the loading completion state, and (A) in the same figure shows the loading completion state.
is a front view, (B) is a plan view, Fig. 2 is a plan view showing the cleaning state during loading or unloading, and Figs. 3 (A) to (C) are plan views showing changes in the state of the loading mechanism. In the figure, (A) shows a tape cassette installed and tape loading is on standby, and (B) shows a state in which loading is in progress but the tape guide has finished moving until it is caught by the catcher. FIG. 4(C) shows a state in which loading has been completely completed, and FIGS. 4(A) and 4(B) are front views showing dirt on the rotating drum to explain the problem. A) shows the state before cleaning, and (B) of the same figure shows the state after cleaning. Explanation of symbols 1... Head cleaning mechanism, 2... Rotating drum, 3... Rotating head, 13...
Cleaning member elastic contact release means, 19... Cleaning member elastic contact means, 22... Cleaning member. (J) Diagram 1 showing loading completion state 1

Claims (1)

[Claims] (1) A cleaning member elastic contact means for bringing the cleaning member into elastic contact with the outer circumferential surface of the rotating drum so as to be able to come into contact with and separate from a rotating head protruding from the outer peripheral surface of the rotating drum; A rotating head cleaning mechanism comprising: cleaning member elastic contact release means for preventing the member from contacting the outer peripheral surface of the rotating drum.