JPS63317959A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To stabilize the traveling of a tape by arranging a rocking device and traveling the tape in its rewinding direction by interposing the tape between a roller and post by rewinding the tape at the inlet port side of a cylinder at reviewing time. CONSTITUTION:At reviewing time a back tension lever 6 is rocked to a tape rewinding roller 5 side by a rocking device 30 and a tape is traveled in the rewinding direction by interposing the tape between the roller 5 rotating at the same peripheral speed as that of a capstan and the post 61 on the back tension layer 6. The tape tension is thus made constant between a winding reel base 8 and the tape rewinding roller 5, the traveling path of the tape passing through a head cylinder 9 is therefore stabilized and a good rewinding reproduction image is obtainable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic recording/reproducing device such as a VTR.

(Prior art) Figure 6 shows a conventional M loading type VTR.
On the chassis (4) are a head cylinder (9), a supply reel stand (7), a take-up reel stand (8), a pair of tape drawer guides (91) (92), and a capstan (100).
, pinch roller (95), back tension lever (6
), and a brake control main slider (1) is provided spanning both reel stands (7) and (8).

The main slider (1) is linked via a lever (98) to a rotary grooved cam (97) that rotates in response to mode switching, and slides in the directions of arrows A1 and A2.

The main slider (1) is provided with a first cam portion (13) that controls a brake lever (71) for the supply reel stand (7).
), a second cam part (14) that controls the brake lever (81) for the take-up reel stand (8), and a third cam part (
15) is formed.

During the pre-run, the Ko cam (97) rotates and the main slider (
1) moves to the right slide end indicated by arrow A2, and in this state the brakes of the supply reel stand (7) and the take-up reel stand (8) are released.

Further, the tension lever (6) is released from the lock by the arm (60) and rotates to the operating position, and the supply reel stand (7
) is tightened to prevent the tape from loosening during running.

At the time of review, the main slider (1) is moved to the back tension lever (
6) side, the auxiliary brake lever (82) is activated by the third cam part (15), and the take-up reel stand (
8) to prevent the tape from loosening during running between the capstan (+, OO) and the take-up reel stand (8).

When stopped, the main slider (1) reaches the sliding end in the direction of arrow A1 due to the rotation of the cam (97), and the brake levers (71) (81) of the supply reel stand (7) and take-up reel stand (8) are activated. Working, both reel stands (7) (8)
It applies the brakes.

Figure 7 shows the tape running loop at the time of review, in which the tape T exits the take-up reel stand (8) and then goes through the review guide (9).
6) → Capstan (100> and pinch roller (95)
→ Fixed guide (94) → Audio control head (93) → Tape leading guide on the cylinder exit side (
91) → head cylinder (9) → tape leading guide (92) on the cylinder inlet side → full width erasing head (99) and is rewound to the supply reel stand (7).

The rewinding rotational drive of the supply reel stand (7) is performed by a known oscillating idler device (not shown), and the tape is pinched by a capstan (ioo) and a pinch roller (95). Since the tape is pulled out from the take-up reel stand (7) by the rotation of the capstan (100
) corresponds to the circumferential speed.

(Problem to be solved) In the tape running loop during review as described above,
As time passes, the tape reel diameter on the supply reel stand (7) side gradually increases, and the capstan (
100) and the supply reel stand (7), the tape running path becomes unstable and there is a problem in that it adversely affects the rewound and reproduced image.

(Means for Solving the Problems) The present invention provides a device for rewinding and rewinding the tape at the same speed as the tape rewinding speed of the capstan (100) on the inlet side of the head cylinder (9). By doing so, we will clarify a magnetic recording and reproducing device that can keep the tension of the tape constant and stabilize the running path of the tape during review.

-4= The magnetic recording and reproducing apparatus of the present invention includes a tape rewind roller (5) that rotates at the same circumferential speed as the capstan (100) on the inlet side of the head cylinder (9), and a back tension lever that rotates at the same circumferential speed as the capstan (100). (6) to the tape rewinding roller (5) side.

(Operation and Effect) During the review, the back tension lever (6) is swung toward the tape rewinding roller (5) by the oscillating device (30), and the roller (5) rotates at the same circumferential speed as the capstan (ioo). ) and the post (61) on the back tension lever (6) to pinch the tape and run the tape in the rewinding direction.

As a result, the tension of the tape is constant between the take-up reel stand (8) and the tape rewind roller (5), and therefore the running path of the tape passing through the head cylinder (9) is stabilized, resulting in good winding. A replayed image can be obtained.

(Example) Since the magnetic recording/reproducing apparatus of the present invention is basically the same as that shown in FIG. 6 and described above, explanation of parts that are not essential parts of the invention will be omitted.

FIG. 1 shows the tape running loop at the time of review in the magnetic recording/reproducing apparatus of the present invention, in which the tape exits the take-up reel stand (8), the review guide (96) → the pinch roller ( 95) → Fixed guide (94) → Audio control head (93) → Cylinder exit side tape leading guide (91) → Head cylinder (9) → Cylinder inlet side tape leading guide (92) → Full width erasing head (99)
) → The reel is rewound to the supply reel stand (7) via between the cheap rewind roller (5) and the post (61) on the back tension lever (6).

Next, the tape rewind roller (5) and back tension lever (6) will be explained.

As shown in FIGS. 1 and 2, the back tension lever (6) is rotatably provided at the left end of the main slider (1) that controls the braking of the reel stands (7) and (8) as explained in the conventional example. A post (61) is freely rotatably erected at the free end of the lever (6) on the head cylinder (9) side, and is hung on the supply reel stand (7) at the free end of the lever (6) on the supply reel stand (7) side. One end of the brake band (62) is connected. As shown in FIG. 6, the other end of the brake band (62) is fixed to a protruding shaft (63) on the chassis.

As shown in Figure 2, the rotation center (64) of the back tension lever (6) is located slightly closer to the head cylinder than the main slider (1), and is biased counterclockwise by a spring (65). ing.

There is a slider (1) near the left end of the main slider (1).
) and a first sub-slider (2) and a second sub-slider (3) that constitute a swinging device (30) that swings the back tension lever (6).

As shown in Figure 4, the main slider (1) has an arrow A.
1. Not indicated by A2, approximately 4 in the sliding direction of the slider
A through cam hole (11) is formed at an angle of 5°, and elongated holes (12) (12) parallel to the sliding direction of the main slider (1) are formed near the cam hole (11).

A guide pin (43) protruding from the lower surface of the chassis (4) is slidably fitted into the parallel elongated hole (12) (12).

A first sub-slider (2) is disposed between the main slider (1) and the chassis (4) so as to be slidable in a direction perpendicular to the sliding direction of the main slider (1), as shown by arrows B1 and B2. A guide pin (21) that is slidably fitted into the cam hole (11) of the main slider (1) is protruded from the lower surface of the sub-slider (2).

A through window hole (22) extending in the sliding direction of the sub-slider is provided in the first sub-slider (2).

A cam piece (23) is provided to protrude inward from the edge of the window hole in the longitudinal direction. Further, a through hole (24) (24) is formed near the window hole (22) in the sliding direction of the sub-slider, and the guide pin (43) of the chassis (4) slides into the long hole (24). It is set up so that it can be moved.

As shown by arrows C3 and C2 above the chassis (4), a second sub-slider (3) is disposed so as to be slidable in a direction perpendicular to the sliding direction of the first sub-slider (2).
A guide pin (4) protruding from the chassis (4) is inserted into the elongated through hole (33) formed in the sub-slider (3) in the sliding direction.
4) is slidably fitted.

A through hole (41) formed in the chassis (4) is loosely inserted into the lower surface of the second sub-slider (3), and the first sub-slider (
A shaft body (31) that fits into the window hole (22) of 2) is provided protrudingly,
There is a tension lever (6) on the top of the sub-slider (3).
A pressing piece (23>) that presses the take-up reel stand (7) a little further than the rotation center (64) is provided in a protruding manner.

The second sub-slider (3) is biased to the left by a spring (34), and the shaft (31) is connected to the window hole (22) of the first slider.
It is in contact with the hole edge on the cam piece (23) side.

Furthermore, a tape rewind roller (5) is provided at the tip of the second sub-slide (3> on the head cylinder (9) side).

The roller (5) is formed slightly longer than the tape width,
The roller shaft (51) freely rotates through the sub-chassis (4), freely passes through a through hole (42) formed in the chassis (4), and has a pulley (52) attached to its lower end.

The above pulley (52) and a pulley (102) attached to the rotating shaft of the capstan motor (101) are connected by an elastic belt (103).

The diameters of both pulleys (52) and (102) are determined so that the circumferential speed of the roller (5) and the capstan (100) match.

However, during the preliminary stage, as explained in the conventional example, the main slider (1) is located at the far right side as shown in FIG. Depending on the relationship with the cam hole (11) of the main slider (1), it slides in the direction of arrow B2 and is located at the farthest position from the head cylinder (9).

Also, since the second sub-slider (3) is biased to the left by the spring (34), the roller (5) on the second sub-chassis (4) and the post (61) at the free end of the tension lever (6) It is spaced apart from the tension lever (6).
acts as a pack tension for the tape T as in the past.

At the time of review, as shown in Fig. 2, the main slider (1) moves slightly from the pre-temporary state in the direction shown by arrow A on the left, and the first sub-slider (2) slides toward the head cylinder side as shown by arrow B1. do.

The shaft portion (31) of the second sub-slider (3) is fitted into the window hole (22) equipped with the cam piece (23) of the first sub-slider (2), and the first sub-slider (2) is directed upward. Due to the movement, the cam piece (23) moves the second sub-slider 3) in the direction of arrow C.
7, that is, in the opposite direction to the main slider (1), and press the pressing piece (3) on the second slider (3).
2), press the tension lever (6) and press the tension lever (6).
6) in a counterclockwise direction, and bring the free end of the lever (6) on the post (61) side closer to the roller (5) side, so that the free end of the lever (6) on the post (61) side approaches the roller (5) side, and the The tape is compressed and in this state the tape is rewound to the supply reel stand (7).

In the example, at the time of review, the pinch roller (95) was separated from the capstan (100), and the tape was run in sliding contact with the pinch roller (95) without contacting the capstan (100). Even if the tape is pressed between the pinch roller (95) and the capstan (ioo) and is rewound as before, the pinch roller (95)
5) and the capstan (100) are the same circumferential speed, so there is no problem.

Note that the rewind roller (5) may not be provided on the second sub-slider (3) but may be provided at a fixed position on the chassis (4).

11- The present invention is not limited to the configuration of the above embodiment, and various modifications can be made within the scope of the claims.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the tape running loop during review in the device of the present invention, Fig. 2 is a plan view of the vicinity of the back tension lever during review, and Fig. 3 is a plan view of the vicinity of the back tension lever during pre-temporary operation. , Figure 4 is an exploded slope view of the main slider, first sub-slider, and second sub-slider.
FIG. 5 is an explanatory diagram showing the state of connection between the capstan motor and the rollers, FIG. 6 is a plan view of a conventional VTR, and FIG. 7 is a plan view of a tape running loop in a conventional review state. (1) Main slider (2) First sub-slider (23) Cam piece (3) Second sub-slider (5) Tape rewinding roller (6) ...Tension lever (7) ...Supply reel stand' -12-

Claims (1)

[Claims] [1] Capstan (100) and pinch roller (95)
In a magnetic recording and reproducing device having a mechanism for transporting a magnetic tape under pressure, a tape rewinding roller (5) rotating at the same circumferential speed as a capstan (100) and a mode are installed on the entrance side of a head cylinder (9). A swinging device (30) is provided to swing the back tension lever (6) toward the tape rewinding roller (5) side in response to switching of the back tension lever (6). (5) and a post (61) on a back tension lever (6). A magnetic recording and reproducing device that runs the tape in the rewinding direction by compressing the tape between the tape and the post (61) on the back tension lever (6). [2] The swing device (30) moves in a straight line every time the mode is switched, and moves the brake lever (71) of the reel stand (7) (8).
) (81) and a main slider (1) that controls the back tension lever (6), and a first sub-slider (2) that moves orthogonally to the slider as the slider moves.
As the first sub-slider (2) moves, it slides in the opposite direction with respect to the main slider (1), and when sliding, it hits the back tension lever (6) and the post (61) side of the lever is pushed against the rewind roller (5). 2. The magnetic recording and reproducing apparatus according to claim 1, comprising: a second sub-slider (3) rotated in a direction approaching the second sub-slider (3).