JPS61258365A - Tape loading device - Google Patents

Abstract

PURPOSE:To avoid the damage of a magnetic tape by setting a guide member which is attached to an arm when the tape is wound around a rotary drum and draws out the tape approximately on an extended line of the tape draw-out port of a cassette and then guiding the tape by the right and left guide members with no contact secured between the tape and a side wall. CONSTITUTION:A magnetic tape is wound symmetrically around a rotary drum 2 by means of guide rollers 24 and 25 and guide poles 26 and 27 provided to the shift stages 22 and 23. A part approximately parallel to the moving direction of a cassette substrate 3 is formed to a cam groove 7 with slightly large length. Then the rotation start timing of an arm 9 is delayed when the substrate 3 starts the relative advance to a substrate 1. Then the arm 9 is put on the stage 22. The roller 24 and the pole 26 start shifting on a guide plate 18 before the shift of the arm 9. This prevents the collision between the arm 9 and a pinch roller 11 and a guide 12 respectively. While a cam groove 8 is provided to avoid the collision between the guide 16 of an arm 14 and the roller 25 and the pole 27 on the stage 23 respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tape loading device for a cassette video tape recorder or the like.

[Summary of the invention]

The present invention has a magnetic tape wound and housed between a supply reel and a take-up reel of a cassette. In a tape loading device that is drawn out and wound around the outer circumference of a rotating drum on which a rotating head is attached, the tape loading device includes a substrate on which the rotating drum is attached, and a cassette substrate on which a cassette is attached and is movable relative to the substrate. and an arm attached to one of the substrate and the cassette substrate, and a cam means for driving the arm attached to the other, utilizing the relative movement of the cassette substrate with respect to the substrate when the cassette is moved to the performance position. Then, the arm is driven by the cam means, and when at least the magnetic tape is wound around the rotating drum, a guide member attached to the arm and for pulling out the magnetic tape is moved within a substantially extension line of the cassette drawer opening. This prevents the magnetic tape from being damaged by allowing the magnetic tape to be guided by the left and right guide members without coming into contact with the side walls constituting the cassette drawer opening.

[Conventional technology]

In cassette video tape recorders, etc., the magnetic tape is housed in the cassette, so the cassette is moved to the playing position, the magnetic tape is pulled out from the cassette, and wound around the outer circumference of the rotating drum on which the rotating head is attached. A so-called tape loading operation is required. FIG. 4 shows the inside of a cassette in this loading state of a so-called 8m video tape recorder.

In the figure, 51 is a cassette, which has a supply reel 52 and a take-up reel 53, and has a magnetic tape 54 as bait.
is rolled up and contained. Denoted at 55 and 56 are left and right drawer openings provided near the supply reel 52 and take-up reel 53, respectively, and are formed relatively narrowly to prevent damage to the magnetic tape 54. 57 and 58 are side walls constituting the drawer opening. Before the magnetic tape 54 is pulled out, it is in the position shown by the dotted line, but when it is pulled out and wound around a rotating drum (not shown), it is in the position shown by the solid line. In this state, the magnetic tape 54 is run.

[Problem that the invention seeks to solve]

In this way, in the conventional device, the magnetic tape 54 is
The side wall 57. which forms the draw-out port 55.56 when it is drawn out from the draw-out port 55.56 and is wound around the rotating drum.
58, it has the disadvantage that it is easily damaged when pulled out or when traveling.

Although the side walls 57 and 58 are formed into curved surfaces, they are generally integrally molded with the cassette 51 from plastic, and it is almost difficult to ensure sufficient surface precision to prevent damage.

[Means for solving problems]

1 to 3 show the configuration of a tape loading device according to the present invention. In these figures, 1 is a substrate, and a rotating drum 2 is equipped with a rotating head (not shown).
is installed. Reference numeral 3 designates a cassette board on which a cassette is mounted, which has a plurality of pins 5 that fit into a plurality of long holes 4 formed in the board 1, and is movable relative to the board 1. 6 is a capstan attached to the substrate 1, and 7.8 is a cam groove formed in the substrate 1.

Reference numeral 9 denotes an arm, which is rotatably supported on a fulcrum 10 of the cassette board 3. The arm 9 has a pinch roller 11, a guide 12 for pulling out the magnetic tape, and a pin 13 that fits into the cam groove 7 of the substrate 1. An arm 14 is rotatably supported on a fulcrum 15 of the cassette board 3, and has a guide 16 for pulling out the magnetic tape and a pin 17 that fits into the cam groove 8 of the board 1. Guide plates 18 and 19 are fixed to the substrate 1 on the outer periphery of the rotating drum 2 in a substantially bilaterally symmetrical manner, each having guide grooves 20 and 21. 22 and 23 are movable tables, and guide plates 18 and 19 respectively.
The rotating drum 2 is guided by guide grooves 20 and 21 of
It can be moved freely around the periphery of. Rotating drum 2 is substrate 1
Since the guide plates 18, 19 are provided at a predetermined angle with respect to the substrate 1, the guide plates 18, 19 are provided parallel to the substrate 1 (of course, the reverse direction is also possible). The moving table 22゜23 is
They each have rotating guide rollers 24, 25 and guide poles 26, 27 inclined at a predetermined angle. 28.
29 and 30.31 are links provided to transmit the relative motion between the substrate 1 and the cassette substrate 3 to the moving table 22.23, and are rotatably connected to each other at a shaft 32.33. . 34.35 are pins provided on the cassette board 3, and holes 45.4 of the links 28.29.
6 and elongated holes 36 and 37 of the substrate 1, respectively. Small slots 38, 39 are provided in each link 28, 30, into which pins 40 fit.

The pin 40 also fits into a small elongated hole 41 in the substrate 1. 42 is a spring, one end of which is connected to the pin 40;
The other ends are respectively connected to the substrate 1.

43 and 44 are reel stands provided on the cassette board 3.

[Effect]

The effect will now be explained. As shown in FIG. 1, the cassette is mounted on the cassette substrate 3 in a state where the cassette substrate 3 is separated from the rotating drum 2. In the state before such loading is started, the guide 12.16
, pinch roller 11, guide roller 24.25. The magnetic tape is positioned between the guide poles 26, 27, etc. and the rotating drum 2. Next, the cassette substrate 3 or the substrate 1 is moved relative to the other by driving a motor (not shown) or by manual operation (for example, the cassette substrate 3 is moved upward in the figure). At this time, the pins 5 of the cassette board 3 are guided by the long holes 4 of the board 1,
The movement is smooth.

On the substrate 1, the cam groove 7 is formed on the radially inner side (left side) upward in the figure. Therefore, as the cassette board 3 moves, the pin 13 moves inward (to the left) along the cam groove 7, so the arm 9 rotates clockwise. As a result, the magnetic tape is pulled out from the cassette by the guide 12.

Similarly, as the cassette board 3 moves, the pin 17
moves inward (to the right) along the cam groove 8, so the arm 14 rotates counterclockwise and the magnetic tape is pulled out from the cassette. At this time, both of the reel stands 43 and 44 can be made rotatable, but one (for example, the winding side) is prevented from rotating by applying a brake, etc.
The magnetic tape may be fed out only from the other side (for example, the supply side).

On the other hand, when the cassette board 3 moves, the long holes 36 of the board 1.
37 along pins 34.35 (thus links 28.29
．． 30.31) moves upward.

The pin 40 moves slightly upward in the small elongated hole 41 of the board 1, but the spring 42 whose other end is fixed to the board 1 prevents this movement, so that the connection part of the link 28.30 by the pin 40 does not move. You will no longer be able to move upwards. Therefore, when the cassette board 3 is further moved upward, the pins 40
The link 28 moves counterclockwise with the link 30 as the fulcrum.
rotate clockwise. At this time link 28.30
Since each has a small elongated hole 38 and 39,
Rotation is not obstructed. As a result links 29 and 3
1 presses the connected moving tables 22 and 23 upward, and the moving stands 22 and 23 are guided by the guide plates 18 and 19 and move upward. Therefore, as shown in FIG. 2, the magnetic tape is wound approximately symmetrically around the rotating drum 2 by the guide rollers 24, 25 and guide poles 26 and 27 provided on the moving table 22, 23 (of course, the magnetic tape is wound on the rotating drum 2 in a symmetrical manner). By appropriately selecting the positions 22 and 23 (that is, the positions of the guide plates 18 and 19), it is also possible to wind the winding asymmetrically.)
. When the cassette board 3 moves upward, the spring 42
The pin 40 moves slightly upward in the small elongated hole 41 of the substrate 1 against the urging force of the pin 40 . As a result, pin 40 is urged downwardly by spring 42 with a stronger force, and link 28 .
A force is applied to the movable base 22.3o to rotate it counterclockwise and clockwise using the pins 34 and 35 as fulcrums, respectively.
23 is pressed against the upper end of the guide plate 18, 19 and positioned accurately. When the cassette board 3 moves the cassette to this playing position, the arm 9 rotates significantly clockwise, so the pinch roller 11 moves the capstan 6
Apply pressure to the magnetic tape. Therefore, the magnetic tape can be run by the capstan 6 and the pinch roller 11.

The cam groove has a slightly longer portion that is substantially parallel to the moving direction of the cassette board 3. As a result, the cassette board 3
When the arm 9 starts moving forward relative to the substrate 1, the timing at which the arm 9 starts rotating is delayed, and the moving stage 22
The guide roller 24 and the guide pole 26 placed on the top and moving on the guide plate 18 start moving first, and these guide the pinch roller 11 of the arm 9. Collision with the guide 12 is prevented. Similarly, the guide 16 of the arm 14 is connected to the guide roller 25 of the movable table 23. A cam groove 8 is formed so as not to collide with the guide pole 27. Note that these arms 9 and 14 are on the board 1 side.

Although the cam grooves 7 and 8 can be provided on the cassette board 3 side, it is better to provide the arm 9.14 on the cassette board 3 side, even if the length is shorter, the longer movement stroke of the guide 12.16 can be avoided. This is advantageous for downsizing.

FIG. 3 shows the inside of the cassette when the magnetic tape is wound around the rotating drum 2. That is, arm 9.
The guides 12 . 16 , each supported by the cassette 51 , are arranged in a general extension of the outlet 55 , 56 of the cassette 51 , at least when the arms 9 , 14 are fully pivoted. Therefore, the magnetic tape 54 does not come into contact with the side walls 57, 58 while being pulled out from the supply reel 52 and reaching the guide 16, and while being taken up from the guide 12 onto the take-up reel 53.

When the amount of the magnetic tape 54 wound on the supply reel 52 and the take-up reel 53 changes, the position of the magnetic tape 54 also changes, and depending on the length of the magnetic tape 54, in all cases the magnetic tape 54 is placed on the side wall. Although it may be difficult to avoid contact with the guides 57 and 58, if the guides 12 and 16 are arranged approximately on the extension line of the drawer openings 55 and 56, at least the period of contact can be shortened. I can do it. In addition, if the guides 12, 16 are always positioned within the range of the extension line of the drawer opening 55, 56 not only at the end of the movement but also at the beginning, the magnetic tape 5
The magnetic tape 54 is prevented from coming into contact with the side walls 57 and 58 not only in the state in which the magnetic tape 54 is wound around the rotating drum 2 but also during the period until the magnetic tape 54 is wound on the rotating drum 2.

Or it can be made shorter in terms of time.

In the above description, the pulling out operation and the winding operation of the magnetic tape are performed by separate members, but they can also be performed by the same member. Further, the relative movement between the substrate 1 and the cassette substrate 3 may be not the linear movement as described above, but may be a rotational movement or a combination thereof.

〔effect〕

As described above, in the present invention, the magnetic tape wound and housed between the supply reel and take-up reel of a cassette is placed between the relatively narrow left and right sections provided near the supply reel and take-up reel. A tape loading device that is pulled out from a drawer opening and wound around the outer circumference of a rotating drum that has a rotating head attached to it.A tape loading device that is pulled out from a drawer opening and wound around the outer circumference of a rotating drum that has a rotating head attached to it. a cassette board, and an arm attached to one of the board and the cassette board.

and a cam means for driving the arm attached to the other end, and the arm is driven by the cam means by utilizing the relative movement of the cassette board to the base board made when the cassette is moved to the playing position, and at least the magnetic tape is rotated. When the magnetic tape is wound around the drum, the guide member that is attached to the arm and pulls out the magnetic tape is positioned within the approximate extension of the cassette drawer opening, so that the magnetic tape forms the cassette drawer opening. The magnetic tape can be guided by the left and right guide members without coming into contact with the side walls of the magnetic tape, thereby preventing damage to the magnetic tape.

[Brief explanation of drawings]

FIG. 1 is a plan view of the tape loading device of the present invention when loading is started, FIG. 2 is a plan view when loading is completed, FIG. 3 is a sectional view showing the inside of the cassette when loading is completed, and FIG. FIG. 4 is a sectional view showing the inside of the cassette upon completion of loading in the conventional case. . 1... Board 2... Rotating drum 3... Cassette board 4.36.37.38.39.41... Long hole 5.13
．． 17.34.35.40.45.46...Pin 6...Capstan 7.8...Cam groove 9.14
... Arm 10.15 ... Fulcrum 11 ... Pinch roller 12.16 ... Guide 18.19 ... Guide plate 20.21 ... Guide groove 22.23 ... Moving table 28. 29.30.31...Link 42...Spring 51...Cassette 55.5
6...Drawer opening 57.58...More than side wall

Claims (1)

[Scope of Claims] The magnetic tape wound and housed between the supply reel and take-up reel of a cassette is placed between relatively narrow left and right sections provided near the supply reel and take-up reel, respectively. A tape loading device that is pulled out from a drawer opening and wound around the outer periphery of a rotating drum on which a rotating head is attached. a cassette board that is movable, an arm that is attached to one of the board and the cassette board, and a cam means that drives the arm that is attached to the other of the cassette boards; driving the arm by the cam means using the relative movement of the cassette substrate with respect to the substrate, and being attached to the arm at least when the magnetic tape is wound around the rotating drum; A tape loading device characterized in that a guide member for pulling out the magnetic tape is positioned substantially within an extension line of the draw-out opening of the cassette.