JPS5810784B2 - video tape recorder tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape mounting device for a magnetic recording/reproducing device (hereinafter referred to as a video tape recorder or the like), and particularly to a tape mounting device most suitable for a cassette type video tape recorder.

In video tape recorders and the like, it is necessary to mount the tape on the circumferential surface of a guide cylinder equipped with a rotating magnetic head at a predetermined angle. automatically.

Many such tape mounting devices have already been proposed.

Among them, for example, the method disclosed in JP-A-47-18512 and JP-A-47-37709 draws out a tape from a tape cassette in a loop shape, and then moves a tape guide arranged around a guide cylinder to the target. By entering the loop and rotating it, the tape is mounted on the circumferential surface of the cylindrical tape guide.

However, in such a conventional example, a separate drive source for driving the drawer guide requires a drive transmission mechanism, making the mechanism complicated, and the tape is pulled out from the side opposite to the rotary plate. Therefore, in addition to requiring extra space, there are undeniable drawbacks in that it is subject to design constraints in order to timely transfer the tape between the drawer guide and the loading guide.

The present invention has been made in view of these drawbacks.

In addition, as a method to eliminate the above-mentioned drawbacks,
No. 517 has been proposed, which discloses a technique for driving the tape pull-out means in conjunction with the rotation of the rotary plate, but in this method, the tape pull-out means is urged in the circumferential direction of the rotary plate by the biasing means. Since the structure is such that the rotary plate is directly pressed against the rotary plate, a pull-out means is added as a load on the rotary plate, and the load increases particularly when the tape is unloaded, which increases the power consumption of the drive source for the rotary plate.

Hereinafter, the present invention will be explained in detail with reference to an embodiment shown in the drawings.

1 to 3 are plan views of the device of the present invention in different operating modes, and FIGS. 4 and 5 are side views of essential parts corresponding to FIGS. 1 and 2, respectively, and both show the same functional elements. The same figure numbers are attached to the figures.

In each figure, a hollow tape mounting rotary plate 2 is rotatably disposed around a guide cylinder 1 (inclined with respect to the base) equipped with a rotating magnetic head. 2, tape guide pins 3.4.5 and pinch rollers are arranged.

The pinch roller P is rotatably supported 6 on the rotating plate 2.
The pinch roller supporting plate 7 is pivotally supported 8.

The pinch roller support plate 7 is constantly urged to rotate by a spring 9, and is locked in the position shown in FIG. 1 by a locking pin 10.

Reference number 11 is a tape cassette, and a tape 13 stretched within the tape cassette 11 faces a notch 12 provided on the front surface.

The drawing number 14 is a tape pull-out mechanism that pulls out the tape in the tape cassette 11 in a loop shape to the outside of the cassette, and is the most distinctive feature of the present invention.

The tape drawing mechanism includes a rotating member 17 which is located outside the rotary plate 2 and whose pivot point 16 is the apex of an imaginary isosceles triangle whose base is the moving length of a tape drawer pin 15, which will be described later. A U-shaped bent portion 18 (see FIGS. 4 and 5) connected to the tip of the rotating member that rotates the rotary member, and a tongue piece 19 that further extends the bottom wing, and the cassette is attached. The pull-out pin 1 is located in the notch 12 and faces the inside of the tape 13.
5 and a support shaft 20 in which the U-shaped bent portion serves as a pair of bearings.
A stop pin 23 is provided on a rotating tongue piece 22 which is pivotally supported and biased counterclockwise by a ground tea 21.

At a predetermined location on the rotary plate 2 (see FIG. 1), a recess 24 that engages with the stop pin 23 is provided together with a locking protrusion 25 on the clockwise side.

Next, the operation of the device of the present invention will be explained together with the detailed configuration.

A pair of reels 26 with the cassette 11 installed
．． The tape 13 wound between the cassettes 27 and 27 is stretched between a pair of guide pins 28 and 29 provided in the cassette, and faces the notch 12.

In the state shown in Figure 1, press the record or play button (or knob)
When is operated, a motor (not shown) that drives the rotary plate 2 is also energized at the same time.

It goes without saying that the motor may be a dedicated motor or a motor for driving other mechanisms.

As the rotary plate 2 rotates, the stop pin 23 that engages with the recess 24 rotates the rotary member 17 clockwise around the pivot point 16, and the pull-out pin 15 pulls out the tape 13 from the cassette 11.

The smoothness and reliability of the engagement between the stop pin 23 and the recess 24 of the rotating plate 2 is ensured by the ground tea 21 that urges the rotating tongue 22 counterclockwise.

The pull-out pin 15 is at the position where the tape has been pulled out for a predetermined length (
(See Fig. 2), the cutout portion 30 provided at the rear of the rotating tongue piece 22 (the side where the stop pin is not planted) engages with the split portion of the tongue piece 19. and the above stop pin 23
is removed from the recess 24 of the rotating plate 2.

At the same time, the side surface of the tongue piece 19 engages with a locking pin 31 provided on the base, and further rotation of the tape pull-out mechanism is prevented.

In the above embodiment, the tongue piece 19 is fixed to the rotary member, but the tongue piece 19 is configured to be lightly biased clockwise with ground tea like the rotary tongue piece, so that accidents such as loosening of the tape can occur. It is also possible to reduce it as much as possible.

In the state shown in FIG. 2, when the rotary plate 2 continues to rotate, the pinch roller P placed on the rotary plate 2 engages with the guide pin 40 provided on the pinch roller support plate T. Then wrap the tape 13 around the guide cylinder 1.

(See Figure 3).

When the tape is fully loaded, the pull-out pin 15 functions as a fixed guide pin, and the tape is transferred to the supply reel 26 - the guide pin 28 - the pull-out pin 15 - the guide pins 5, 4.3 - the pinch roller P - the capstan 32. - voice control head 33 - guide pin 34 - guide cylinder 1 - guide pin 35 - erasing head 36 - guide pin 37 - guide pin 29 in the cassette - transported through the path of take-up reel 27.

The tape unloading operation is performed by rotating the rotary plate 2 in the opposite direction while winding up the tape with the supply reel 26.

When the rotating plate 2, which rotates in the opposite direction, comes to the position shown in FIG.
is fitted into the recess 24, and thereafter the pinch roller P is inserted into the tape 13.
The pull-out pin 15 instead pulls and holds the tape 13 while storing the tape into the cassette.

As described above, according to the present invention, without directly engaging the pull-out bar with the rotary plate, the pull-out bar is provided with a rotatable piece, and the engaging member is engaged in the radial direction of the rotary plate via this. Since they are made to coincide with each other, they do not act as a load in the rotating direction of the rotary plate, and do not increase the power consumption of the drive source of the rotary plate.

Further, when the rotary plate is rotated to a predetermined position when the tape is drawn out, the engagement between the engaging member and the rotary plate is automatically released, so there is an advantage that no separate release means is required.

[Brief explanation of drawings]

The figures relate to the device of the present invention, and FIGS. 1 to 3 are plan views in different operating modes, and FIGS. 4 and 5 are side views of essential parts corresponding to FIGS. 1 and 2, respectively. It represents. Explanation of main drawing numbers, 1...Guide cylinder, 24
...... Locking protrusion, 2... Rotating plate, 14.
...Tape pull-out mechanism, 15...Tape draw-out pin, 23...Station pin.

Claims (1)

[Claims] 1. A pull-out pin that pulls out the tape stored in the cassette, a pull-out lever on which the pull-out pin is placed, a rotary plate that surrounds the mounted body, and a tape that is provided on the rotary plate and that is pulled out by the pull-out pin. a guide pin for hooking the tape to mount the tape around the mounted object; a rotating piece rotatably provided on the pull-out lever; and a rotating piece provided on the rotating piece to engage and disengage from the rotating plate. and a stopper that restricts the rotation of the pull-out lever, and the engaging member is engaged with the rotary plate before tape loading starts, and when the tape is loaded, When the pull-out lever rotates in conjunction with the rotation of the rotary plate, the pull-out pin pulls out the tape from within the cassette, and when the rotary plate rotates to a predetermined position, the engaging member and the rotary plate At the same time, the rotation of the pull-out lever is restricted by the stopper, and further rotation of the rotary plate causes the pulled-out tape to be moved around the mounted object by the guide pin. A tape mounting device for a video tape recorder, characterized in that it is mounted.