JPS6343821B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an image magnetic tape in which a magnetic tape in a tape cassette is drawn out from a rotating drum having a magnetic head inside thereof by tape guides on the entrance side and an exit side and wound around the magnetic head. This invention relates to improvements in recording and reproducing devices.

In general, the mechanical operations required in a video magnetic recording/reproducing device (hereinafter referred to as a VTR) include rotation of the video head, rotation of the capstan, rotation of the reel, and a loading mechanism that pulls the tape out of the cassette and winds it around the cylinder. There is a pinch roller crimping mechanism to feed the tape at a constant speed, a tension adjustment mechanism to keep the tape tension constant, and a reel brake mechanism to prevent the tape from pulling out too much slack. In conventional VTRs, the pinch roller crimping mechanism and later are lever-type changeover switches,
It is composed of a combination of electromagnets and other cam links, and requires force to operate the switch and consumes a lot of power. It had drawbacks such as being heavy.

This invention was made to eliminate the above-mentioned drawbacks, and provides a VTR that consumes less power, is lightweight, and has good operability.

First, an overview of the VTR will be explained with reference to FIG.
In the figure, reference numeral 2 denotes a rotating drum, and magnetic heads 1, 1 are arranged at equal intervals on the outer peripheral surface of the drum, and are arranged on a substrate 3 at a predetermined angle. A pair of inlet and outlet tape guides 4 and 5, a fixed magnetic head 6 for recording and reproducing audio signals and rotation control signals, a capstan 7 for running the magnetic tape 14, its pinch roller 8, and the running magnetic tape 14. A band brake 10 is disposed in conjunction with a tension 9 that keeps the tension constant. Further, the tape cassette 13, which holds therein a set of supply and take-up reels 11 and 12 for winding the magnetic tape 14, has entrance side tape guides 4 in cutouts 15, 16, and 17 formed on its side edges, respectively. The magnetic tape 14, which is removably positioned on the board 3 so as to receive the tape guide 5 on the outlet side of the tension pin and the capstan 7, passes through the internal guide pins 18, 19, and connects to each of these notches 15, 16, 17. It's starting to pass. Reel discs 20 and 21 are disposed directly below the supply and take-up reels 11 and 12 and rotate together with the respective reels 11 and 12, and each reel 20 and 21 rotates due to vibration or the like.
To prevent the magnetic tape 14 on the side edge of the tape cassette from slackening, the reel brake 2 is activated during non-magnetic recording and playback.
2, 23 is multiplied.

When performing magnetic recording and reproduction, first remove the brakes 22 and 23 applied to the reel disks 20 and 21, and then move the pair of inlet and outlet tape guides 4 and 5 from the positions of the notches 15 and 16 to the magnetic tape that is in the non-set position. The tape 14 is moved along the path indicated by the dotted line arrow, and the magnetic tape 14 is wound around the outer circumferential surface of the rotating drum at an angle exceeding 180 degrees, and at the same time is brought into contact with the fixed magnetic head 6 surface.
And this magnetic tape 1 is
4 is clamped to the capstan 7, and at the same time the tension pin 9 is moved along the dotted line path, and the reverse operation is performed after magnetic recording and reproduction are completed. While the magnetic tape 14 is running, when the magnetic tape tension increases, the tension pin 9 moves in the D direction, and repeats the operation of weakening the magnetic tape tension by loosening the interlocking handbrake 10, thereby reducing the tension of the magnetic tape 14. It is kept constant.

Next, an embodiment of the present invention shown in FIGS. 2 and 3 will be described. Figure 2 shows the state before the magnetic tape in the tape cassette is pulled out, and the third
The figures show the state in which the magnetic tape in the tape cassette is pulled out and wound on a rotating drum. In these figures, the same reference numerals as in FIG. 1 indicate the same or corresponding parts. 4 and 5 are partial internal gears 24 arranged concentrically at the inlet and outlet tape guides, respectively.
It is attached to an inlet side arm 25 connected to an outer ring 24 having an external gear a and an outlet arm 27 connected to an inner ring 26 having a partial external gear 26a. And an internal gear 24a and an external gear 26a
A pinion 28 is installed at a position where it engages simultaneously with the pinion 28 and is rotated by a reversible drive means. outer ring 24
is guided on the outside by the base plate 3, and the inner ring 26 is guided on the inside by the base plate 3, and is rotatable. Also, on the outer periphery of the outer ring 24 are a tension pin off lever cam 29 and a reel brake cam 3.
1. A pinch roller cam 33 and a limit switch cam 34 are provided, and each cam 29, 31, 3
3 and 34, a tension pin off lever 30, a reel brake lever 32, a pinch roller arm 36, and a limit switch 35 are arranged so as to be pressed against each other by spring force.

In the VTR configured in this manner, when the pinion 28 rotates in the A direction, the outer ring 24 rotates in the B direction and the inner ring 26 rotates in the C direction, and the reel brake lever 32 enters the recess 31 and the reel brakes 22, 23 are rotated. is removed, the entrance side and exit side tape guides 4 and 5 move, and the magnetic tape 14 is drawn out from the tape cassette 13 and wound around the drum 2 until it hits the tape guide stoppers 37 and 38. At this time, limit switch 35 is set to cam 3.
4, the rotation of the pinion 28 is stopped. Furthermore, the pinch roller 8 is pressed against the capstan 7 by a cam 33.

Further, while the magnetic tape 14 is being pulled out from the tape cassette 13 and being wound around the rotating drum 2, the tension pin 9 moves to the E position in accordance with the movement of the tension pin off lever 30 which contacts the cam 29. Note that after completing magnetic recording and reproduction, this operation is reversed.

As described above, according to the present invention, a plurality of cams are provided on the outer periphery of the outer ring of the movable tape guide that reversibly moves the tape guide from the non-set position to the set position, and the cams drive and control the magnetic tape operating mechanism. As a result, the number of component parts is reduced compared to the conventional one, productivity and operability are improved, and the tape is lightweight, and since the magnetic tape operating mechanism does not require an electromagnet, power consumption is reduced, among other effects. be.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an outline of a VTR, and FIGS. 2 and 3 are block diagrams showing an embodiment of the present invention. In the figure, 2 is a rotating drum, 4 and 5 are inlet and outlet tape guides, 8 is a pinch roller, 9 is a tension pin, 24 is an outer ring, 2
5 is the entrance side arm, 26 is the inner ring, 27 is the exit side arm, 28 is the pinion, 29 is the cam for the tension pin off lever, 30 is the tension off lever, 31 is the reel brake cam, 32 is the reel brake lever, 33 is a pinch roller cam, 34
is a limit switch cam, 35 is a limit switch, and 36 is a pinch roller arm. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A capstan for running the magnetic tape with respect to the tape running path between the supply reel and the take-up reel that is stopped by pressure contact of the reel brake, and a pinch roller that faces the capstan via the magnetic tape. Tension pins or the like that maintain the tension of the running magnetic tape at a constant level are set at positions facing each other with a rotating drum having a magnetic head therein sandwiched therebetween. In a device having first and second tape guides for pulling out a magnetic tape from a cassette and mounting it on the rotating drum, an inner ring having the first tape guide attached thereto and an inner ring having the second tape guide attached thereto. a cam disposed opposite to the rotating drum; and a cam that presses and releases the pinch roller from the capstan via the magnetic tape;
A cam for press-contacting and releasing the reel brake from both reels is disposed along the outer periphery of the outer ring, and both tape guides and the cam are moved by rotating both the rings in opposite directions,
A video magnetic recording and reproducing apparatus characterized in that the magnetic tape is mounted on the rotating drum, the pinch roller is pressed and released, and the reel brake is pressed and released.