JPH0451905B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a half loading device used in a VHS video tape recorder (VTR).

(b) Prior Art In VHS system VTRs, in fast forward and rewind modes, the tape is housed in a cassette, and a dedicated head is often used for cueing and the like. However, there is a method that uses control signals to cue the beginning of a program, and in order to use this method, even in fast forward or rewind mode, it is necessary to pull out a portion of the tape and use the control R/R /
It is necessary to bring it into contact with the P head.

Examples of configurations for this include a configuration in which a mechanism consisting of a motor, a rack pin, an arm, etc. is provided separately, as in the conventional example of JP-A No. 57-100658, or a configuration in which a tape is wound around a guide cylinder as in the embodiment of this publication. A configuration is known in which the means is also used for half loading.

However, the former has a complicated structure, and the latter causes the guide cylinder and tape to come into contact even during fast forwarding, so there is a risk of damage to the tape.

(c) Problems to be Solved by the Invention It is an object of the present invention to provide a half-loading device with a simplified configuration and no risk of tape damage.

(d) Means for Solving the Problems The present invention provides a pinch roller lever that rotates in accordance with the rotation of a mode control motor of a VTR, a pin mounted on the pinch roller lever, and a cam associated with this pin. This is a half loading device comprising a rotating lever with a surface and a tape pull-out lever connected to the rotating lever.

(E) Function Since the tape pull-out lever rotates in response to the rotation of the pinch roller lever and pulls out the tape to a predetermined position, a half-loading device with a simple configuration can be realized.

(f) Examples Examples of the present invention will be described below with reference to the drawings.
Fig. 1 is a plan view showing the stopped state of the VTR (although some parts are omitted), Figs. 2 to 4 are plan views showing some parts (however, some parts are omitted), and Fig. The fast-forward/rewind (hereinafter referred to as FF) state, FIG. 3 shows the loading completion state, and FIG. 4 shows the playback state.

In the figure, 1 is a metal chassis that is the base of the mechanism, 2 is a rotating guide cylinder with a built-in rotating head, 3 and 4 are a pair of tape drawer members for winding the tape around the rotating guide cylinder 2, and 5 is a supply reel stand. , 6 is a take-up reel stand, and 8 is a bracket on which an audio/control R/P head 7 (indicated by a broken line) is mounted, which are supported on the chassis 1.

Reference numeral 9 is a slide lever for controlling the mechanism (only a portion is shown; it is actually located on the back side of the chassis 1), and a loading motor (not shown) (controls the mode of the VTR mechanism).
It moves in the direction of arrow A according to the rotation of . By moving this slide lever, the brake of the reel stand, the reel stand drive mechanism, etc. are controlled.

A pinch roller lever 10 is rotatably supported around a shaft 11 (installed on the chassis 1), and a pinch roller 12 is rotatably supported at one end 10a. A spring 13 is stretched between the other end 10b and the slide lever 9, and as the slide lever 9 moves, the pinch roller lever 10 rotates. Also, pinch roller lever 1
An engagement pin 14 is installed at the end 10a of the 0.

Reference numeral 15 denotes a capstan shaft of a capstan motor, which pinches the tape with the pinch roller 12 and drives the tape during playback, etc. Further, 16 is a tape guide pin. Reference numerals 17 and 18 are guide grooves for the pair of tape drawer members 3 and 4, and 19 and 20 are means for positioning the tape drawer members.

Reference numeral 21 denotes a rotary lever rotatably supported around a shaft 22 mounted on the chassis 1, and a cam surface 21a that comes into contact with the engagement pin 14 is formed in a part of the rotary lever. A tape pull-out lever 23 is rotatably supported around a shaft 24 installed on the chassis 1, and has a tape pull-out pin 25. This tape pull-out lever 23 fits into the shaft, and the tape pull-out lever 23 and the stopper pin 2
Torsion spring whose end engages with 6 (not shown)
is biased counterclockwise by.

A connecting lever 27 transmits the rotation of the rotary lever 21 to the tape pull-out lever 23, and is connected to the rotary lever 21 and the tape pull-out lever 23 by shafts 28 and 29, respectively.

In the stopped state shown in Figure 1, the cassette is not connected to the VTR.
When attached to the tape pull-out member 3, 4, the pull-out pin 25 of the tape pull-out lever 23, and the capstan shaft 15, the tape path (shown by a dashed line) 3
It's inside 0.

The state of the mechanism of the VTR, that is, the mode of the VTR, is changed in response to the horizontal movement of the slide lever 9 in accordance with the rotation of the loading motor.
In the case of the embodiment, from the stopped state shown in FIG.
Move to the FF state shown in FIG. In this state, the slide lever 9 moves a little, and as a result, the pinch roller lever 10 rotates a little, the tape pull-out lever 23 also rotates, and the tape 30 is pulled out a little, and the audio/control R/P head 7 and tape 30 are pulled out. are brought into contact with each other. However, the tape drawer members 3 and 4 have not moved yet.

Furthermore, when the loading motor rotates, tape drawer members 3 and 4, which are separately linked to the loading motor, begin to move. At this time, the pinch roller lever 10 is further rotated counterclockwise, and the tape pull-out lever 23 is also further rotated clockwise. Therefore, the tape pull-out pin 25 does not hinder the movement of the tape pull-out member 4 (see FIG. 3).

When the rotating motor further rotates from the loading completion state, the VTR enters the playback state.
At this time, as shown in Fig. 4, the slide lever 9
has further moved to the right in the figure, the pinch roller 12 and capstan shaft 15 are pressed together, and due to the shape of the cam surface 21a, the tape pull-out lever 23 is moved more counterclockwise than in the state shown in FIG. It is in a state of rotation. This is to prevent the tape pull-out pin 25 from coming into contact with the tape to adversely affect the running of the tape during playback.

When unloading a tape, the operations described above are reversed.

As mentioned above, in the FF state, the tape is partially pulled out and the audio/control R/P head 7
Since it is in sliding contact with the control signal, the control signal can be reproduced in the FF state. Therefore, operations such as cueing and tape counter operations can be performed using control signals.

(G) Effects of the Invention As described above, according to the present invention, since the tape pull-out pin for half loading is driven using the movement of the pinch roller lever, the structure is simple and effective.

[Brief explanation of drawings]

FIG. 1, FIG. 2, FIG. 3, and FIG. 4 are all plan views showing embodiments of the present invention. 9... Slide lever (moving member), 10... Pinch roller lever, 14... Engagement pin, 21... Rotating lever, 21a... Cam surface, 23... Tape drawer lever.

Claims (1)

[Claims] 1 A rotation mechanism comprising a pinch roller lever that rotates in accordance with the movement of a movable member for mode control of a video tape recorder, an engagement pin provided on this pinch roller lever, and a cam surface related to this engagement pin. A half-loading device comprising a lever and a tape pull-out lever connected to the rotating lever.