JPH0138762Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is a video tape recorder (VTR).
Regarding magnetic recording and reproducing devices such as
This provides a tape mounting mechanism suitable for VCRs.

In general, the tape mounting mechanism of a cassette-type VTR is constructed as shown in FIG. 6 is a cylinder drum having a rotating magnetic head, 7 is a back tension guide, 8 is a tape guide, 9 is an erasure head, 10 and 11 are guy rollers, 12 is an audio control head, 13 is a tape guide, and 14 is an erase head. A pinch roller, 15 is a capstan, and 16a, 17a, 16b, and 17b are tape guides for tape mounting provided on the entrance and exit sides of the magnetic tape with respect to the cylinder drum 6.

Tape guides 16a, 17a, 16b, 17b
are inserted into the opening 5 of the tape cassette 1 when the tape cassette 1 is first installed in the main body of the apparatus, but when the tape is loaded, the positions 16a' and 1
Move to 7a', 16b', 17b'. That is,
When the rotational power of the motor rotated by operating a recording or reproducing push button (not shown) is transmitted to the wire take-up reel through a gear etc., two wires are wound onto this reel. , a pair of tape guides 16a, 1 connected to each end of the same wire.
7a, 16b, 17b move in the direction shown by the arrow in the figure to positions 16a', 17a', 16b', 1
7b', and at this point the power supply to the motor is cut off. Therefore, the magnetic tape 4 pulled out in a loop from between the pair of reels 2 and 3 of the tape cassette 1 is moved to the tape guides 16 and 17.
a, 16b, 17b, the cylinder drum 6
It is pushed toward the side and mounted in pressure contact with the tape guide 8, erasing head 9, guide roller 10, cylinder drum 6, guide roller 11, audio control head 12, tape guide 13, etc.

By the way, in such a tape mounting mechanism, it is desirable to fix the erase head 9, audio control head 12, etc. to the chassis together with the cylinder drum 6 from the viewpoint of stable running of the magnetic tape 4. When the erasing head 9 is fixed to the chassis in this way, the wrapping angle of the magnetic tape 4 around the head 9 is likely to be insufficient. For deeper winding, a tape expansion lever is required located within the cassette to expand the tape loop outward.

In the magnetic recording and reproducing apparatus of this invention, the tape expansion lever and the back tension lever are moved by using the movement of the tape mounting guide book.
A description will be given below along with embodiments shown in the drawings.

The tape mounting guide block indicated by the reference numeral 21 in FIG.
a, 16b, 17b, and is connected to one end of a wire (not shown), and when mounting the tape, as in the past, the tension force of the wire moves the movement trajectory along the guide groove 22 as shown by the arrow. Move in the direction of A. Then, at the beginning of this movement, the tape expanding lever 23 is driven in conjunction. That is, the tape expanding lever 23, which is engaged with the guide block 21 and receives the tensile force of the coil spring 24 in one direction, causes its engaging portion to protrude onto the movement track and is engaged with the engaging portion. As the guide block 21 moves in the direction of arrow A, it begins to rotate in the direction of arrow B, causing the tape expansion post 23a to change the running path of the magnetic tape 4. At this time, the back tension lever 25, which is engaged with the tape expansion lever 23 and receives the tensile force of the coil spring 26 in one direction, rotates in the direction of arrow C, and the back tension pin 2
5a is brought into contact with the magnetic tape, and the tape tension is rotated to a balanced position.

The tape mounting guide block 21 is connected to the guide groove 2.
2, the tape expanding lever 23 rotates further and brings the tape expanding post 23a into contact with the stopper 27, as shown in FIG. Then, when the guide block 21 reaches the predetermined positions 16a' and 17a', the tape loading operation is completed and the magnetic tape 4 is
is in good pressure contact with the periphery of the mounted objects such as the erasing head 9 and the cylinder drum 6.

Guide block 21 when releasing tape loading
, the tape is moved along the guide groove 22 from the tape loading position by the tension of the unloading wire (not shown).
Move in the direction of A′. In the process of this movement, the lever 23 comes into contact with the engaging portion 23b of the tape expanding lever 23 again, and the lever 23 is moved by the coil spring 24.
It begins to rotate in the direction of arrow B' against the spring pressure.
Also, due to this rotation, the back tension lever 25 engaged with the guide 23 is rotated in the direction of arrow C' against the spring pressure of the coil spring 26, and the back tension pin is moved to the tension release position. By moving the guide block 21 and the tape expansion post 23a into the opening 5 of the tape cassette 1, the state shown in FIG. 2 is restored and the tape loading is released.

As described above, according to the present invention, the tape expansion lever and the back tension lever are moved on the tape loading guide block, so that the tape expansion post and the back tension pin can be moved in a timely manner with a simple configuration. This can be done and the effect is great.

[Brief explanation of the drawing]

Fig. 1 is a plan view schematically showing the magnetic tape mounting mechanism of a cassette-type VTR, Fig. 2 is a plan view of the main parts of a magnetic recording and reproducing device implementing this invention, and Fig. 3 shows the operation of the main parts. It is a top view for explanation. 1... Tape cassette, 2... Supply reel,
3... Take-up reel, 4... Magnetic tape, 6...
Cylinder drum, 9... Erasing head, 16a, 1
6b, 17a, 17b, 21... Tape guide for tape mounting, 22... Guide groove, 23... Tape drawer guide, 24... Coil spring.

Claims (1)

[Claims for Utility Model Registration] Engagement portion 23b extending in a direction across guide groove 22
and a tape expansion post 23a, and a tape expansion position where the tape expansion post 23a is brought into contact with the stopper 27 by the urging force of the spring 24, and a tape expansion position where the tape expansion post 23a resists the urging force of the spring 24. The tape expanding lever 23 rotates between two positions, a return position and a return position where the tape is stored in the cassette notch, and the tape expanding lever 23 engages with the engaging portion 23b during unloading by reciprocating along the guide groove 22. Then, the tape expanding lever 23 is rotated in the return direction so that the tape expanding lever 23 is stored in the cassette notch following the tape expanding post 23a, and is separated from the engaging portion 23b during loading. a tape mounting guide block 21 that allows the tape expansion post 23a to move and abuts the tape expansion post 23a against the stopper 27 and guides the tape to the circumferential surface of the guide cylinder 6; The tape expanding lever 2 engages with the tape expanding lever 23 that moves to the tension release position outside the cassette, and moves to the expanding position.
3 and a tension applying lever 25 which is disengaged from the tension applying lever 25 and moves to a tension applying position circumscribing the tape loop.