JPS61165854A - Tape loading device - Google Patents

Abstract

PURPOSE:To avoid such a case where a magnetic tape gets out of a tape draw- out means or receives damage and to ensure the smooth tape draw-out and loading operations, by providing a thick pat to the 1st guide member to prevent the undesired vertical and horizontal displacements or vibrations of said guide member. CONSTITUTION:When a stop button is pushed when a recording or reproducing mode is cover, the 1st and 2nd tape draw-out means 30 and 28 are reset to the draw-out positions shown by solid lines from that shown by chain lines A and B. In this case, no large gap is produced even if the means 30 having the same structure as the means 28 is set at a position where the sloping angle of the 1st guide member 33 has a small or virtually no change since thick parts 36a-36e are provided there. This minimizes such a case where the means 30 moving over the member 33 has the undesired vertical and horizontal displacement or vibrations.

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 in an inverted Ω shape, and video signals are recorded or reproduced using a helical scan method. In the tape loading device of a cassette-type video tape recorder, it is necessary to wind the magnetic tape around the rotating head cylinder in an inverse Ω shape and diagonally, so the winding of the magnetic tape around the rotating head cylinder is done on the inlet side and on the winding side. The height of the attachment must be different from the exit side. For this purpose, for example, the tape pull-out member on the exit side for winding is moved horizontally or almost horizontally, but the tape pull-out member on the entrance side for winding is in the non-drawing position of the magnetic tape. It is necessary to move the reed so that it is at the same height as the tape pull-out member on the side, and then rises higher as it reaches the final pull-out position of the silver tape.

FIG. 6 is a side view of a main part of a conventional example of a tape drawing means on the entrance side for such winding and a guide member for guiding the movement thereof. In the figure, 1 is a tape pull-out pin for pulling out the magnetic tape through the opening of a tape cassette (not shown), 2 is a tape guide/instrument that guides the running of the magnetic tape, and these are installed in the movable body 3. has been done.

Two pins 4a and 4b are added to the lower part of the movable body 3, and these pins 4a and 4b are connected to the guide groove 6 of the guide member 6 whose height increases from the left side to the right side in the figure. It is movably inserted into the

T is a retaining plate attached to the lower ends of the pins 4a, 4b, and it goes without saying that this is wider than the groove width of the guide 11116. Reference numeral 8 denotes a drive member connected to the retaining plate 7, and by pulling this in the direction of arrow F, the tape drawer pin 1, tape guide pin 2, movable body 3, pins 4a, 4b, and The tape drawing means including the stopper plate 7 moves along the guide groove e in the direction of arrow G, that is, in the tape drawing direction.

Problems to be Solved by the Invention However, in the conventional example described above, the following problem occurs because the guide member 6 has the same thickness throughout. That is, the tape pulling means moves the movable body 3 so that it can move smoothly even in the part of the guide member 6 where the change in slope is the largest (indicated by k in FIG. 5).
The distance between the guide member 5 and the retaining plate 7 is set, and the distance must be increased as the change in the slope of the guide member 5 becomes larger and as the distance between the pins 4a and 4b becomes wider. Particularly in the former case, the wrapping of the magnetic tape around the rotating head cylinder becomes more pronounced as the corner friction increases.

In the latter case, if the distance between the pins 4a and 4b is made smaller, atb, the movement in the direction of arrow G and the opposite direction is likely to occur, so the distance between the movable body 3 and the retaining plate 7 should be considerably large. The current situation was unavoidable.

For this reason, the tape pulling means passes through the position shown in FIG. ), the distance between the lower surface of the guide member 5 and the upper surface of the retaining plate 7 or the distance between the lower surface of the movable body 3 and the upper surface of the guide member 5 becomes considerably large, and as a result, the tape drawer member is moved upwardly and downwardly. Unnecessary displacement from side to side or vibration, etc.
This causes the problem that the magnetic tape is damaged or the magnetic tape comes off from the tape pull-out pin 1, making it difficult to draw out the magnetic tape or store it in the tape cassette.

In view of the above-mentioned problem, the present invention provides a method for preventing unnecessary displacement of the tape pulling means vertically or horizontally even if the tape pulling means is located in a part where the change in slope of the guide member is small or almost non-existent. It is an object of the present invention to provide a tape loading device which minimizes vibration and allows smooth and reliable tape extraction or tape storage by a tape extraction means.

Means for Solving the Problems In order to solve the problems mentioned above, the present invention has a tape log system 7.
The pulling device serves as a guide member that guides the movement of the tape pulling means on the upstream side with respect to one running direction of the magnetic tape, at least in a portion of the moving path of the tape pulling means where the change in slope is small or there is almost no change. This is the one in which a thick section is provided.

Effect of the present invention With the above configuration, the tape drawing means can be used not only in the portions of the guide member where the change in slope is large (curved portions) but also in the portions where the change in slope is small.
Or even if it is brought to a part where there is almost no curve (for example, a part with a small curve or a flat part), the amount of vertical and horizontal displacement and vibration are suppressed to a minimum, and as a result, the tape cassette is This prevents the magnetic tape from being dislodged from the tape pull-out pin of the tape pull-out means or being damaged due to partial abnormal tension applied to the magnetic tape when the tape is pulled out or stored.

Embodiments 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, reference numeral 10 indicates an opening 1 through which a magnetic tape (not shown) can be drawn out.
11L, 11b, a tape cassette having a take-up tape reel 12a and a supply tape reel 12b; 13 is a rotating head cylinder disposed near the tape cassette 1o; In order to record a video signal obliquely by winding the tape in a range of 100 to 100, the tape is mounted at an angle with respect 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 a guide mechanism (not shown). here,
The first drive ring 141L is connected to the second drive ring 14
b, and each outer periphery has a connecting portion 15.
1L and 15b are integrally formed, and teeth are formed over a predetermined range on the outer periphery of each. In this example, the lower first drive ring 14& is formed with teeth approximately on the left half, and the upper second drive ring 14& is formed with teeth.
Regarding "b", a tooth portion is formed approximately on the right half.

Reference numeral 1811 is a first drive gear that meshes with the teeth of the first drive ring 141, and is rotated as required by a drive source (not shown). 16b is a second drive gear that meshes with the teeth of the second drive ring 14b, and this is in a nozzle with an intermediate gear 160 that is integrally formed with the first drive gear 161L. Therefore, for example, when the first drive gear 16a rotates clockwise, the second drive gear 16b rotates counterclockwise, and accordingly, the first drive ring 14 & The second drive ring 14b will rotate clockwise. That is, this case is the time of tape loading. Here, the first drive ring 14& and the first drive gear 16!
L denotes the first drive means and said second drive ring 1
4b and the second drive gear 16b constitute a second drive means.

A connecting lever 17 has one end rotatably connected to the connecting portion 151L of the first drive ring 14& constituting the first driving means, and a headed pin-like body 18 implanted in the other end. be. As clearly shown in FIG. 2, the headed pin-shaped body 18 is loosely fitted into a guide groove 20 of a second guide member 19 provided near the right outer periphery of the rotary head cylinder 13, and is fitted along the guide groove 20. It is possible to move around. In this case, the outer diameter of the head of the headed pin-like body 18 is the same as that of the guide groove 20.
The width of the pin-shaped body 18 is larger than the width of the pin-shaped body 18.
will not come out of the guide groove 20 unnecessarily. A positioning part 21 which also serves as a stopper is provided at the rear edge of the guide 20 by bending a part of the second guide member 19 upward.

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 body having a tape pull-out pin 24 and a tape guide pin 26 installed in parallel or substantially parallel to each other. Note that the head of the headed pin-like body 18 is fitted into the stepped portion of the recess 23 .

Reference numeral 26 denotes a retaining member having an L-shaped cross section that holds the headed pin-like body 18 in the state inserted into the recessed portion 23, and is screwed to the movable base body 22 by screws 27. ing. Here, the headed pin-shaped body 1
8, the tape pull-out pin 24, the tape guide pin 26, and the retaining member 26, the movable base 22 constitutes a second tape pull-out means 28.

29 is a movable base body having a tape pull-out pin 31 and a tape guide pin 32 which constitute the first tape pull-out means 3o which basically has the same structure as explained in FIG. First guide member 330 guide groove 34 provided near the left outer periphery of the head cylinder 13
The second drive ring 14b is connected to the connecting portion 15b of the second drive ring 14b via a connecting lever 35 so as to be movable along the second driving ring 14b. In this embodiment, the second tape pull-out means 28 is moved parallel or almost parallel to the plane of the paper in FIG. (which has the same height as the second non-drawing position or approximately the same height as #1), but the first tape drawing means 30 moves to the first non-drawing position shown by the solid line in FIG. When moving from the drawn-out position to the second drawn-out position (which is also higher than the first non-drawn-out position) shown by the chain line B, the tape does not curve but gradually rises. The drawer pin 31 and the tape guide pin 32 move toward the movable base 2 in the direction in which their tips approach each other.
As shown in FIGS. 3 and 4, the first guide member 33 has a substantially S-shaped guide groove 34 and a slanted surface. It is formed. In this case, the first guide member 33 is
It is composed of two divided members 33a and 33b, and has a chevron-shaped thick part (convex strip) in a part of the moving path of the first tape pulling means 30, where the change in slope is small or there is almost no change. part) 3ea, aeb.

36a, 364, and 36e are provided. In addition, Figure 3,
In FIG. 4, 37a, 37b, and 37o are protrusions 3a and 37o for inserting and positioning into the chassis (not shown).
, 38b, 380.38 (!, 381!1 is a hole for screw insertion for installation, 39 is a lead wire clamp/par. First guide member 3 including clamper 39
3 is integrally molded from synthetic resin such as Duracon resin.

In the above structure, when the first drive gear 161L is rotationally driven clockwise at the required time and the first drive ring 14& is rotated 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, whereby the second tape drawing means 28 moves from the second non-drawing position shown in solid lines in FIG. along the guide groove 20 of the second guide member 19 to the drawn-out position.

On the other hand, the power of the first drive gear 16& is transmitted through the intermediate gear 160,
the second drive ring 14b via the second drive gear 16b;
Similarly, the second drive ring 14b rotates approximately half a turn clockwise. Accordingly, the power is transmitted to the connecting portion 15b,
Connection lever 36.・It is also transmitted to the movable base 29, fJ/E
The tape pulling means 30 of No. 1 is fMl shown by a solid line in FIG.
The first guide member 33 moves along the guide groove 34 of the first guide member 33 from the non-drawn out position to the first drawn out 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 is pulled out by the first tape pull-out means 3o and the second tape pull-out means 28, and is wound around the outer periphery of the head cylinder/cylinder 13 for one rotation over a range of 270 degrees, and recording or reproduction is performed. It will be done.

When a stop button (not shown) is operated after recording or playback, the first and second tape ejecting means 30
．． 28 return from the drawn-out position indicated by chain lines M and B, respectively, to the non-drawn-out position indicated by a solid line. In this case, the first tape pull-out means 30, which has a similar structure to the tape pull-out means shown in FIG. However, there is a thick part 36! Since L to 36e are provided, a large gap as shown in FIG. 5(B) does not occur, and therefore, the first tape drawing means 30 that moves (slides) on the first guide member. Unnecessary vertical and horizontal displacement and vibration are minimized.

Effects of the Invention As is clear from the above description, according to the tape loading device of the present invention, the first tape drawing means moves on the first guide member having an inclined surface for drawing out or storing the tape. In addition to curved parts where the change in slope is large, even if the change in slope is small or almost non-existent, the thick part provided on the first guide member In addition, since the first guide member is prevented from vibrating when it is unnecessarily displaced vertically or horizontally, the magnetic tape will not be damaged if it comes off the tape pull-out means, and the tape can be pulled out. This allows for smooth and reliable storage.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway top view of an embodiment of the present invention, and FIG.
Figure 1 is an exploded perspective view of the main part of Figure 1, Figures 3 and 4 are top and side views showing an example of the guide member used in the present invention, Figure 6 is a conventional example. 10... tape cassette, 13... rotary head cylinder, 19... second guide member, 20... guide Groove, 28...Second tape pulling means, 29...Movable base, 30.
...First tape drawing means, 24.31...
...Tape drawer pin/, 33...First guide member, 34...Guide groove, 361L to 366.
...Thick part. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 Figure 8b Figure 5

Claims (3)

[Claims] (1) first and second non-extracting positions located within the tape cassette in order to pull out the magnetic tape from the tape cassette and attach it to the outer periphery of a rotating head cylinder disposed near the tape cassette; first and second tape pull-out means movable between first and second pull-out positions located in the vicinity of the rotating head cylinder; and a first tape located on the upstream side with respect to the forward running direction of the magnetic tape. a first guide member having a guide groove and an inclined surface portion for guiding the drawing means from the first non-drawing position to a higher first drawing position, and a downstream side with respect to the forward running direction of the magnetic tape; a second tape drawing means from the second non-drawing position,
a second guide member for guiding the tape to a second drawer position having the same or approximately the same height; a movable body and a retaining member that can come into sliding contact; and a first member that is coupled between the movable body and the retaining member so as to be movable within a guide groove of the first guide member.
and a second pin, and a tape pull-out pin implanted on the movable body, and the first guide member is arranged such that at least a change in inclination in the movement path of the first tape pull-out means A tape loading device characterized in that a thick portion is provided in a small or almost non-existent portion. (2) The first guide member has a plurality of thick parts,
The tape according to claim (1), wherein at least one of them has the function of correcting the inclination of the tape pull-out pin during movement of the first tape pull-out means. Loading device. (3) The first guide member, including the thick portion, is integrally molded from synthetic resin.
The tape loading device according to item 1) or item (2).