JPS61148662A - Tape loading device - Google Patents

Abstract

PURPOSE:To prevent damage to a magnetic tape at times of loading/unloading of a tape cassette by minimizing the length of moving to the tape drawing direction in the tape-drawing direction even if the driving ring slightly deviates by some causes when the tape drawing mean is in non-drawing position. CONSTITUTION:The revolutionary center (x) of the 1st driving ring 14a is located on or approximately on the extension line G of the straight line that connects the connecting point (c) of a coupling lever 17 and the 1st driving ring 14a and the fixing point (d) of the lever 17 and the 1st tape drawing mean 28 (i.g. the headed pin state 18). Also, the revolutionary center (y) of the secondary driving ring 14b is located on the extension line H of the straight line that connects the connecting point (e) of a coupling lever 35 and the 2nd driving ring 14b and the connecting point (f) of the lever 35 and the 2nd tape drawing mean 30. Consequently, in a state when the primary and the 2nd tape drawing means 28 and 30 are positioned at the non-drawing position, if any revolutionary deviation occurring the means 28 and 30, the length of drawing in the drawing direction by the means 28 and 30 is made minimum.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape loading device used in a cassette video tape recorder.

2. Description of the Related Art Conventionally, a magnetic tape is pulled out from a tape cassette and attached to the outer periphery of a rotating head cylinder disposed near the tape cassette to record or reproduce video signals. In the loading device, when the tape cassette held by the tape cassette holder is set in a predetermined position, as shown in FIG.
The magnetic tape 4 is inserted through the tape drawer bins 3a and 3b, which constitute tape drawer means, and are positioned inside the magnetic tape 4. And those tape drawer bins 3a, 3b
Generally, the magnetic tape 4 in the tape cassette 1 is pulled out of the tape cassette by movement in the directions of arrows a and l). Note that 5a in FIG.

6b is the rotating head cylinder 9 for the pulled out magnetic tape.
This is a bin (or also called a post) that guides the running of the magnetic tape when attached to the outer periphery of each of the tape drawer bins 3a.

Identical support member 6a to move with 3b.

It is attached to 6b. Also, 7a in FIG.

Drive rings 7b are separately rotatably held around the rotary head cylinder 9 by guide mechanisms (not shown), and 7a and 7b are arranged so as to overlap each other on the lower side and the upper side. In addition, those driving rings 7a
, 7b are formed with gear-like teeth over a predetermined range, and a drive gear (not shown) that rotates when necessary meshes with these parts, and when loading the tape, the lower side The drive ring 7a rotates approximately half a turn counterclockwise, and the upper drive ring 7b rotates approximately a half turn clockwise. As a result, the support member 6a connected to the drive ring 7a via the lever 8a moves to the position 6a' shown by the chain line, and the drive ring ybK
The support member 6b connected via the lever 8b moves to a position 6b' indicated by a chain line, and attaches the magnetic tape 4 of the tape cassette 1 to the outer periphery of the rotary head cylinder 9 in an inverted Q shape.

Problem to be Solved by the Invention However, in the above-mentioned conventional cheap loading device, when the tape drawer bins 3a, 3b are brought to the non-drawer position shown in solid lines in FIG. Suppose that for some reason they are unnecessarily displaced counterclockwise or clockwise as indicated by the arrows, the displacement will be transmitted through the connecting levers 8a, 8b to the supporting members 6a, 6a, 8b.
6b to pull them in the directions of arrows a and t), the tape drawer bins 3a and 3t) were sometimes unnecessarily displaced to positions 3a' and 3b' shown by chain lines.

The cause of unnecessary displacement of the drive rings 7a and 7b is, for example, mechanical "backlash" that inevitably occurs between the drive rings Ta and the guide mechanism that rotatably supports the drive rings Ta and 7b. can give.

Therefore, when the tape cassette 1 is moved in the insertion direction of the tape drawer bins 3a, 3b for recording or playback in the above-mentioned state, that is, in the direction perpendicular to the plane of the drawing, the magnetic tape 4 is moved in the tape drawer. Bins 3a', 3b'
There was a problem that it could be damaged by coming into contact with it.

In view of the above-mentioned problems, the present invention has been designed to reduce the amount of displacement of the tape pull-out means in the tape pull-out direction even if the drive ring is unnecessarily displaced for some reason when the tape pull-out means is in the non-drawer (unloading) position. An object of the present invention is to provide a tape rope ink device that minimizes the amount of ink.

Means for Solving the Problems In order to solve the above problems, the tape loading device of the present invention pulls out the magnetic tape from the tape cassette,
between a non-extracted position located inside the magnetic tape in the tape cassette and a withdrawn position located near the rotary head cylinder so as to be attached to the outer periphery of a rotary head cylinder disposed near the tape cassette; first and second tape drawer means capable of moving the first and second tape drawers;
and first and second drive rings driven along respective guide grooves provided in the vicinity of the rotating head cylinder to move the second tape pulling means between the non-drawing position and the drawing position. , a first connecting member connecting the first tape pulling means and the first drive ring, and a second connecting member connecting the second tape pulling means and the second tape pulling means. and each connection between the first drive ring of the first coupling member and the first tape withdrawal means in the non-extraction positions of the first and second tape withdrawal means; The first and second tapes are placed on an extension of a straight line connecting the points and on an extension of a straight line connecting each connection point of the second drive ring and the second tape pull-out means of the second connection member, respectively. The center of rotation of the drive ring is located at or approximately at the center of rotation of the drive ring.

Effects The present invention can prevent unnecessary displacement of the tape extracting means in the non-extracting position by the above-described configuration, thereby preventing damage to the magnetic tape when loading the tape cassette. EXAMPLE Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a top view of a main part of an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the main part. In those drawings, 1o is an opening 1 through which a magnetic tape (not shown) can be drawn out.
1a, 11b, a tape cassette having a take-up tape reel 12a, and a supply tape reel 12b; 13 is a rotary head cylinder disposed near the tape cassette 1o; In order to record a video signal diagonally by winding it around the paper, it is mounted obliquely to a base (not shown) parallel to the plane of the paper.

Reference numerals 14a and 14b are first and second drive rings rotatably held around the rotary head cylinder 13 by guide mechanisms (not shown). here,
The first driving ring 14a is the second driving ring 14b.
, and each outer periphery has a connecting portion 15a.
, 15b are integrally formed, and teeth are formed over a predetermined range on the outer periphery of each. In this example, the teeth are formed approximately on the left half of the lower first drive ring 14a, and the teeth are formed approximately on the right half of the upper second drive ring 14b.

16a is a first drive gear that meshes with the teeth of the first drive ring 14a, and is rotated by a drive source (not shown) when required. A second drive gear 16b meshes with the teeth of the second drive ring 141), and this gear meshes with an intermediate gear 16c formed integrally with the first drive gear 16a. Therefore, for example, when the first drive gear 16a rotates clockwise, the second drive gear 16b rotates counterclockwise, and accordingly, the first drive gear 16b rotates counterclockwise.
The second drive ring 14a rotates counterclockwise, and the second drive ring 14b rotates clockwise. That is, this case is the time of tape loading. here,
The first drive ring 14a and the first drive gear 16a serve as a first drive means, and the second drive ring 14b
The second drive gear 16b constitutes a second drive means.

17 has one end rotatably connected to a connecting portion 15a of the first driving ring 14a constituting the first driving means,
The other end is a connecting lever with a headed pin-like body 18 implanted therein. As clearly shown in FIG. 2, the headed pin-shaped body 18 is loosely fitted into a guide groove 20 of a base body 19 provided near the right outer periphery of the two-turn head cylinder 13, and can move along the guide groove 2o. It looks like this. In this case, the outer diameter of the head of the headed pin-like body 18 is made larger than the width of the guide groove 20, so that the headed pin-like body 18 will not come out of the guide groove 2o unnecessarily. do not have. Note that the guide groove 2
A stopper 21 formed by bending a part of the base body 19 upward is provided at the rear end edge of the base body 19.

22 is provided separately from the headed pin-like body 18, and includes a stepped recess 23 at the rear end into which the headed pin-like body 18 can be inserted, and a stepped recess 23 located at the front and back with respect to the magnetic tape pull-out direction. It is a movable base having first and second posts 24, 25 installed in parallel or substantially parallel. Note that the headed pin-shaped body 1 is provided at the stepped portion of the recess 23.
8 heads fit together. Reference numeral 26 denotes a removal prevention piece having an L-shaped cross section that holds the headed pin-like body 18 in the state inserted into the recess 23, and is screwed to the movable base 22 with a screw 27. ing. Here, the headed pin-like body 18 and the first. Second
The movable base body 22 including the posts 24, 25 and the removal prevention piece 26 constitutes a first tape drawing means 28.

Reference numeral 29 denotes a movable base body having third and fourth posts 31 and 32 constituting the second tape pulling means 30, and this is a movable base body having a guide groove of the base body 33 provided near the left outer periphery of the rotary head cylinder 13. 34, it is connected to the connecting portion 15b of the second drive ring 14b via a connecting lever 36. e in Figure 1
, f indicates a connection point (connection pin). In this embodiment, the first tape pull-out means 28 moves parallel to the paper surface of FIG. 1 from the position shown by the solid line (non-drawing position) to the position shown by the chain line A (drawing-out position). but,
The second tape pull-out means 3° gradually rises when moving from the position shown by the solid line in FIG. and fourth post 31, 32
are attached to the movable base 29 with their respective tips being inclined sharply in the direction toward each other.

Here, as is clear from FIGS. 1 and 2, in this embodiment, the first drive ring 1 of the connecting lever 17
The rotation center X of the first drive ring 14a is located on the extension line G of the straight line connecting the connection point C with the drive ring 4a and the connection point d with the first tape pull-out means 28 (that is, the headed pin-shaped body 18). Alternatively, the second drive ring is located approximately on the extension line H of the straight line connecting the connection point e of the connection lever 36 with the second drive ring 14b and the connection point f of the second tape pull-out means 30. The rotation center y or position of j4b.

It is configured to be approximately located.

In the above structure, when the first drive gear 16a is rotationally driven clockwise at the required time and the first drive ring 14a rotates approximately half a turn counterclockwise, the power is transferred to the connecting portion 16a and the connecting lever. 17, is transmitted to the movable base body 22 via the headed pin-like body 18, thereby guiding the first tape drawing means 28 from the non-drawing position shown in solid line in FIG. 1 to the drawing position shown in chain line A. It moves along the groove 2o.

On the other hand, the power of the first drive gear 16a is transferred to the intermediate gear 16C2.
the second drive ring 14 via the second drive gear 16t)
b, and the second drive ring 14b rotates approximately half a turn clockwise. As a result, the power is transferred to the connecting portion 16b.
, connection lever 35. This is also transmitted to the movable base body 29, and the second tape drawing means 30 moves along the guide groove 34 from the non-drawing position shown by the solid line in FIG. 1 to the drawing position shown by the chain line B.

Through the above operations, if the tape cassette 10 is set in the position shown by the chain line in FIG.
, 11b of the first tape pull-out means 28. the second post 24.25 and the third. of the second tape withdrawal means 3°. It is pulled out by the fourth post 31, 32 and wrapped around the outer periphery of the rotary head cylinder 13 over a range of 270 degrees for recording or reproduction.

When recording or playback is finished and a stop button (not shown) is operated, the first and second tape ejecting means 28
．． 30 returns from the drawn-out position shown by chain lines A and B to the non-drawn-out position shown by solid lines.

Here, while the first and second tape drawing means 28.30 are located at the return position, that is, the non-drawing position, for some reason the first and second drive rings 14a,
Even if the levers 14b are slightly rotated counterclockwise or clockwise, the two connecting levers 17 and 35 will rotate, but the first and second tape pull-out means 28 and 30 will be pulled and moved in the tape pull-out direction. The amount of magnetic tape is extremely small compared to the conventional example shown in FIG.
will not be damaged by. This means that each drive ring 14a,
The center of rotation of 14b" + 7 is the position or, respectively,
This is due to the fact that each mechanism is configured so that the two mechanisms are approximately located in the same position.

Effects of the Invention As is clear from the above explanation, according to the tape loading device of the present invention, even if the drive ring is slightly rotationally displaced for some reason when the tape drawing means is in the non-drawing position, the tape drawing means Since the amount by which the magnetic tape moves in the tape pull-out direction is extremely small, an excellent effect can be obtained in that the magnetic tape is not damaged by the tape pull-out means when the tape cassette is taken out or loaded. And, by this, the tape drawing means,
The design, arrangement, and processing precision of the drive means can be more flexible.
Alternatively, effects such as being extremely advantageous in downsizing the video tape recorder can also be obtained.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway top view of an embodiment of the present invention;
The figure is an exploded perspective view of the main part of Fig. 1, and Fig. 3 is a top view of the main part of the conventional system. 10... Tape cassette, 13... Rotating head cylinder, 14a, 14t)... Drive ring, 15a, 18b... Drive gear, 17
, 36... Connection lever, 18... Headed pin-shaped body, 19.33... Base body, 20.34
...Guide groove, 22.29...Movable base, 24, 25, 31.32...Post, 28.
30...Tape drawing means, c, d, e. f...Connection point! ...... Drive ring 14a
Center of rotation of y, center of rotation of drive ring 14b, G, H...extension line. Name of agent: Patent attorney Toshio Nakao and 1 other person f3
- ~ - Same 1 and 1 puy shilling - Figure 2 Figure 3 Figure Eh' Procedural amendment September 1980 770 1988 Patent application ji 269 e es a No. 2 Name of the invention Tape loading device 3 Amendment Relationship with the case involving a patent application
Address 1006 Bold Kadoma, Kadoma City, Osaka Name (582) Representative of Matsushita Electric Industrial Co., Ltd.
Toshihiko Yamashita 4 Agent 571 Address 2, Matsushita Electric Industrial Co., Ltd., 1006 Oaza Kadoma, Kadoma City, Osaka Prefecture Claims A magnetic tape is pulled out from a tape cassette and placed near the tape cassette. A first magnetic tape movable between a non-extracted position located inside the magnetic tape in the tape cassette and an extended position located near the rotary head cylinder so as to be attached to the outer periphery of the rotary head cylinder.
and a second tape pulling means, and said first and second tape pulling means;
first and second drive rings driven along respective guide grooves provided in the vicinity of the rotary head cylinder to move the tape withdrawing means between the non-drawer separate position and the withdrawn position; A drive comprising: a first connecting member connecting the first tape pulling means and the first drive ring; and a second connecting member connecting the second tape pulling means and the second driving ring. and each connection point between the first drive ring and the first tape withdrawal means of the first coupling member in a non-extraction position of the first and second tape withdrawal means; and on an extension of a straight line connecting each connection point of the second drive ring and the second tape pull-out means of the second connection member, respectively, the first and second tape pull-out means. 1. A tape loading device characterized in that the center of rotation of a drive ring is located at or approximately at the same position.

Claims (1)

[Claims] In order to pull out a magnetic tape from a tape cassette and attach it to the outer periphery of a rotating head cylinder disposed near the tape cassette, a non-drawing position located inside the magnetic tape in the tape cassette and a rotating head cylinder are arranged. A first drawer that can be moved between drawer positions located nearby.
and a second tape pulling means, and said first and second tape pulling means;
first and second drive rings driven along guide grooves respectively provided in the vicinity of the rotating head cylinder to move the tape pulling means between the non-drawing position and the drawing position; a first connecting member connecting the first tape pulling means and the first drive ring; and a second connecting member connecting the second tape pulling means and the second tape pulling means. and connecting each connecting point of the first drive ring of the first connecting member and the first tape pulling means in non-drawing positions of the first and second tape pulling means. On the extension line of the straight line and on the extension line of the straight line connecting each connection point of the second drive ring and the second tape pull-out means of the second connection member, the first
and a tape loading device characterized in that the center of rotation of the second drive ring is located at or approximately at the same position.