JPS6120064B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape mounting device for winding a tape around a cylinder in a video tape recorder.

FIGS. 1 and 2 show a conventional tape loading device, both of which show a state in which a tape has been loaded onto a cylinder. In FIG. 1, the tape 2 is hooked onto the drawer member 4 from the position of the drawer member 4 shown by the dotted line on the cassette 1, rotates around the cylinder 3 as shown by the arrow, and reaches the position of the drawer member 4 shown by the solid line. It is pulled out and wrapped around the cylinder 3. tape 2
When wrapped around the cylinder 3, the tape is guided and supported by the cylinder entry guide post 5, the cylinder exit guide post 6, and the tape guide posts 7, 8, and 9. The tape mounting device shown in FIG. 1 has disadvantages in that the entire device is large, the tape running path is complicated, and a considerable amount of power is required to rotate the tape pull-out member 4.

In the tape loading device shown in FIG. 2, tape pull-out members 10 and 11 are located at the dotted line position within the cassette 1, hook the tape 2, move in the direction of the arrow, and load the tape 2 at the solid line position. In this conventional example, the tape pull-out members 10 and 11 also serve as guide posts on the cylinder entry and exit sides.
Therefore, it is necessary to strictly control the accuracy of the relative position of the tape pull-out members 10, 11 with respect to the cylinder 3, but since the tape pull-out members 10, 11 are movable, it is very difficult to maintain this accuracy. Further, there is a drawback that a considerable amount of power is required to move the tape drawing members 10 and 11.

An object of the present invention is to provide a tape mounting device that is small, lightweight, and capable of mounting tape without requiring large amounts of power.

In the present invention, the main body and the cassette are constructed such that when the cassette is attached to the main body, a supply reel and a take-up reel are located on both sides of the cylinder, and a tape is attached to the cassette in advance via a movable guide so as to surround the cylinder position. After the cassette is mounted, the movable guide is moved to wrap the tape around the cylinder.

A third embodiment of the tape mounting device of the present invention will be described below.
This will be explained with reference to FIGS. Figure 3 shows the state in which the cassette 1 indicated by the two-dot chain line is attached to the 3rd part of the cylinder of the main body.
is constructed such that a supply reel 12 and a take-up reel 13 are located on both sides of the cylinder 3 when the cassette 1 is installed. Therefore, in cassette 1,
A supply reel 12 and a take-up reel 13 are arranged at positions that sandwich the cylinder 3 from both sides when attached to the main body, and a movable tape guides the cylinder 3 so that the tape 2 surrounds the position of the cylinder 3 when the cassette 1 is attached to the main body. Guides 16 and 17 are provided. Therefore,
The tape 2 pulled out from the supply reel 12 passes through the tape guide 14 and the cylinder entry side guide post 15 to the movable tape guides 16 and 1, as shown by the solid line.
7 to the rear side of the cylinder 3, and is wound onto a take-up reel 13 via a cylinder outlet guide post 18 and a tape guide 19.

The relationship between the cassette 1 and the main body is such that when the cassette 1 is installed in the main body of the video tape recorder, the supply reel 12 and the take-up reel 13 are engaged with a reel stand (not shown) on the main body of the video tape recorder. The cylinder 3 on the main body is positioned to be inserted into the center hole 26 of the tape cassette shown by the two-dot chain line of the cassette 1. fast forwarding tape 2,
Quick reversal can be carried out along the travel path shown by the solid line in FIG. 3 with the supply reel 12 and take-up reel 13 engaged with the reel stand.

When recording and playing back on a video tape recorder,
When the playback button (not shown) is pressed, the movable tape guides 16 and 17 in the cassette 1 are driven from the main body and rotate around the cylinder 3 as shown by the arrows in FIG. It passes through the gap between the cylinder entry guide posts 15 and the gap between the cylinder 3 and the cylinder exit guide post 18, and reaches the position shown by the dotted line in FIG. If a winding torque is generated on the winding reel 13 during this operation, the tape will eventually move to the movable tape guide 16,
17, and is mounted between the cylinder 3, the cylinder inlet guide post 15, and the cylinder outlet guide post 18 as shown by the dotted line in FIG.

When the playback button is pressed, the above-mentioned movable tape guide 16,
Simultaneously with the movement of 17, the tension arm 20, pinch roller 21, and movable guide 22 move from the solid line position in FIG. 3 to the dotted line position as shown by the arrow. At this time, the pinch roller 21 is pressed against the capstan 25 with an appropriate pressing force. This results in tape 2
The running path of the tape 2 is shaped as shown by the dotted line in FIG. 3, and the tape 2 comes into contact with the erasing head 23 and the audio control head 24.

Next, when a stop button (not shown) is pressed, the operation is completely opposite to that of forming the recording/reproducing travel path described above, and the tension arm 20, pinch roller 21, and movable guide 22 return from the dotted line position to the solid line position. The tape guides 16 and 17 perform an operation to separate the tape 2 from the cylinder 3, and the running path of the tape 2 becomes the position shown by the solid line in FIG. In this state, the cassette 1 can be ejected from the video tape recorder main body.

The cylinder entry side guide post 15 and the cylinder exit side guide post 18 are required to have strict relative positional accuracy with respect to the cylinder 3.
The figure shows details of the cylinder entry guide post 15 and cylinder exit guide post 18 shown in FIG.

In Figure 4, the cylinder entry side guide post 1
5 and the cylinder exit side guide post 18 are attached to the tape guide holder 28 in the tape cassette case 27.
is movably held by a tapered hole 31 on the inner periphery.
is provided. On the other hand, in the main body of the video tape recorder, a guide body 29 is provided on a common chassis 30 with the cylinder 3 in an accurate positional relationship. Exit guide post 1
It is machined to have the same taper as the taper hole 31 drilled in 8. Therefore, when the cassette 1 is inserted in the direction of the arrow in FIG.
Since the guide post 15 and the guide post 18 on the cylinder entry side can be placed in accurate positions, the cylinder entry guide post 15 and the cylinder exit guide post 18 can be placed in accurate positions.
A leaf spring 32 attached to the lower surface of the tape cassette case 27 is provided to generate a pressing force to securely fit the cylinder entry guide post 15 and the cylinder exit guide post 18 onto the guide body 29. .

FIG. 5 shows a means for moving the movable guides 16 and 17, in which guide grooves 33 and 34 are provided to guide the movement of the movable tape guides 16 and 17 installed in the tape cassette case 27. The movable tape guides 16 and 17 are configured to move smoothly along the guide grooves 33 and 34. On the other hand, a slide plate 35 is disposed on the video tape recorder main body, and when the cassette 1 is attached to the main body and the take-up reel 13 and the supply reel 12 are engaged with the reel stand, the movable tape guides 16, 1
The lower ends of the slide plates 7 are inserted into slide grooves 36 and 37 provided in the slide plate 35. In order to move the movable tape guides 16, 17, the slide plate 35 can be moved in the direction of the arrow in FIG. With this operation, the movable tape guide 16,
17 can move along the guide grooves 33 and 34 and wrap the tape 2 around the cylinder 3. When the slide plate 35 is moved in the direction opposite to the arrow, the movable tape guides 16 and 17 move in the opposite direction to the above movement, and the tape 2 can be unwound around the cylinder 3.

FIG. 6 shows another embodiment, which differs from the above embodiment in that the cylinder entry guide post 15 and cylinder exit guide post 18 are not housed in the tape cassette 1 but are installed on the main body side of the video tape recorder. However, separate movable tape guides 38, 39 are provided within the cassette 1 instead. As shown in FIG. 6, the movable tape guides 38 and 39 include a cylinder entry guide post 15 and a cylinder exit guide post 1.
The tape 2 is guided and held within the cassette 1 at a position away from the tape 8. Cylinder entrance guide post 15
Since the cylinder exit guide post 18 is located on the main body and is stationary, the positional accuracy of the cylinder entry guide post 15 and the cylinder exit guide post 18 can be maintained at high accuracy by adjusting in advance. . When the cassette 1 is attached to the video tape recorder body, the cylinder entry guide post 15 and the cylinder exit guide post 18
is adapted to enter the cassette 1 through holes 40 and 41 made in the cassette 1.

Tape 2 along the tape running path shown by the solid line in Figure 6.
The ability to perform fast forwarding and fast reversing is similar to the embodiment shown in FIG. The tape running path during recording and reproduction is shown by the dotted line in FIG. In the case of this embodiment, the movable tape guides 16 and 17 move in the direction of the arrow in FIG. 38 and 39 move in the direction of the arrow from the solid line position to the dotted line position to wrap the tape 2 around the cylinder entry guide post 15 and the cylinder exit guide post 18.

To release the tape winding, move the movable tape guide 1 in the opposite direction to the arrow.
6, 17, 38, and 39 are moved. The movable tape guides 38, 39 can be easily moved by a mechanical link mechanism, for example, by utilizing the movement of the slide plate 35 shown in FIG. The operations of the other parts shown in FIG. 6 are completely similar to the embodiment shown in FIG.

As described above, the tape mounting device of the present invention can be made significantly smaller in size and lighter than conventional ones, and does not require large power when mounting the tape on the cylinder. This has the advantage that the positional accuracy of the guide post and the cylinder outlet side guide post can also be made highly accurate.

[Brief explanation of the drawing]

1 and 2 are plan views of a conventional tape mounting device after the tape has been mounted on the cylinder, respectively. FIG. 3 is a plan view showing an embodiment of the tape mounting device of the present invention, and FIG. The figure is a detailed view of the cylinder inlet and outlet guide posts when the main body of the cassette in Figure 3 is attached, Figure 5 is a perspective view for explaining the movement of the movable guide in Figure 3, and Figure 6 is a diagram of the present invention. FIG. 7 is a plan view showing another embodiment of the tape mounting device. 1: cassette, 2: tape, 3: cylinder, 1
2: Supply reel, 13: Take-up reel, 16,1
7, 38, 39: Movable tape guide.

Claims (1)

[Claims] 1. In a tape mounting device for a helical scan video tape recorder equipped with tape guide posts on the tape entry side and the tape exit side of the cylinder,
The main body and cassette are constructed so that when the cassette is attached to the main body, a supply reel and a take-up reel are positioned on both sides of the cylinder, and a tape is held in advance in the cassette so as to surround the cylinder position via a movable guide. The cassette can be installed from the top side of the cylinder, and after the cassette is installed, the movable guide is moved to the side of the cylinder where the tape is not wound, approximately parallel to the bottom of the cassette, and the tape is wound around the cylinder. Characteristic tape mounting device.