JPH075557Y2 - Magnetic tape recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial application field" The present invention relates to a magnetic tape recording / reproducing apparatus, and more specifically, a magnetic tape recording / reproducing apparatus having an improved structure for switching the strength of winding torque of a magnetic tape. Regarding

“Prior Art and Its Problems” In a magnetic tape recording / reproducing apparatus, it is necessary to switch the winding strength of the magnetic tape between the loading state and the unloading state. For example, the winding torque may be weakened in the normal reproduction mode, and the winding torque may be increased in the high speed reproduction mode.

In the conventional device, the loading mechanism for loading and unloading the magnetic tape and the winding torque switching mechanism for switching the strength of the winding torque of the magnetic tape are provided independently of each other. Done by the circuit.

However, there is a problem in that it is difficult to detect the timing and the like and the circuit becomes complicated when the control circuit harmonizes both mechanisms.

[Object of the Invention] An object of the present invention is to provide a magnetic tape recording / reproducing apparatus in which the operations of the loading mechanism and the winding torque switching mechanism are coordinated by a simple structure using a cam. is there.

[Structure of the Invention] A magnetic tape recording / reproducing apparatus of the present invention comprises a motor, a first cam moved by the motor, a loading mechanism driven by the first cam for loading and unloading a magnetic tape, A second cam that moves in conjunction with the first cam; and a winding torque switching mechanism that is driven by the second cam to switch the strength of the winding torque of the magnetic tape. The constitutional feature is that the strength of the winding torque can be switched independently of the loading or unloading state by interlocking the second cam.

[Operation] In the magnetic tape recording / reproducing apparatus of the present invention, the operations of the loading mechanism and the winding torque switching mechanism are coordinated by the interlocking of the first cam and the second cam, and in both the loading state and the unloading state. The strength of the winding torque can be switched.

Therefore, the operations of both mechanisms are mechanically harmonized only by controlling the motors that drive both cams, the configuration is simplified as a whole, and harmony is ensured.

[Embodiment] The present invention will be described in more detail based on the embodiment shown in the drawings. 1 to 6 are schematic plan views showing the essential parts of a magnetic tape recording / reproducing apparatus according to an embodiment of the present invention.
1 is an eject mode, FIG. 2 is a fast-forward / rewind mode, FIG. 3 is a stop mode in an unloading state,
FIG. 4 shows the reproduction mode, FIG. 5 shows the high-speed reproduction mode, and FIG. 6 shows the stop mode in the loading state. The present invention is not limited to the embodiments shown in the drawings.

In FIG. 1, a motor 1 rotationally drives a loading cam 3 as a first cam via a reduction mechanism 2 and a switching cam 10 as a second cam via the loading cam 3. sell. The switching cam 10 is rotated at least once.

The loading cam 3 is provided with a spiral groove cam 3a, and the segment pin 4a of the segment gear 4 is in contact with the spiral groove cam 3a.

Therefore, when the loading cam 3 is rotationally driven by the motor 1, the segment gear 4 rotates about the fulcrum 4b in accordance with the spiral groove cam 3a.

When the segment gear 4 rotates, the loading gears 5 and 6 are rotationally driven, and the pole base 8 moves along the loading guide 9 via the loading arm 7.

These segment gear 4, loading gear 5, loading gear 6, loading arm 7, pole base 8, and loading guide 9 constitute a loading mechanism.

When the pole base 8 is in the position shown in FIG. 1, the magnetic tape is in the state of being stored in the cassette half, that is, in the unloading state, and when the pole base 8 is moved as shown in FIG. Is pulled out from the cassette half and attached to the rotary drum, that is, in a loading state.

The switching cam 10 includes a winding torque switching cam 10a and a braking cam 1
0b and are provided.

The switching cam 10 is rotationally driven at a reduction ratio of 1: 1 with the loading cam 3, and accordingly, the winding torque switching cam 10 is driven.
The a and the braking cam 10b are rotationally driven.

A lever pin 11a of a winding torque switching lever 11 comes into contact with the winding torque switching cam 10a, and the winding torque switching lever 11 rotates about a fulcrum 11b in accordance with the rotation of the winding torque switching cam 10a.

The take-up torque switching lever 11 forms a part of the take-up torque switching mechanism. When the take-up torque changeover mechanism 11 is in the position shown in FIG. 1, the take-up torque is set to a weak torque, while in the position shown in FIG. In some cases, the winding torque is set to a strong torque.

Since the loading cam 3 and the switching cam 10 are mechanically interlocked by rotating the motor 1, the loading mechanism and the winding torque switching mechanism driven by them are naturally interlocked.

Now, on the braking cam 10b, the follower pin 12a of the follower 12 is
Are in contact. The follower 12 is in contact with the brake pin 13a of the brake lever 13.

When the braking cam 10b rotates, this causes the follower 12 to reciprocate, whereby the brake lever 13 rotates about the fulcrum 13b, and the brake shoe 13c is pressed or released from the reel stand 14 of the magnetic tape. Therefore, reel stand 14
The braking is performed and the braking is released.

Since the braking cam 10b is rotated by the switching cam 10, the braking of the reel base 14 also operates in conjunction with the loading mechanism and the winding torque switching mechanism.

Next, the eject mode, the fast-forward / rewind mode, the stop mode in the unloading state, the reproducing mode, the high-speed reproducing mode and the stop mode in the loading state of this magnetic tape recording / reproducing apparatus will be described.

First, FIG. 1 shows the eject mode. This mode
It is a state in which the cassette half is not attached or a state immediately after the attachment.

In the unloading state of the loading mechanism, the take-up torque switching lever 11 is set to the position of low torque, and the braking of the reel base 14 is released.

In FIG. 1, when the motor 1 is rotated from the state of the eject mode to rotate the loading cam 3 and the switching cam 10 as shown by the arrow in FIG. 1, the state of the fast forward / rewind mode shown in FIG. 2 is obtained. .

In this fast-forward / rewind mode, the spiral groove cam 3a does not rotate the segment cam 4, so the loading mechanism is kept in the unloading state. On the other hand, the winding torque switching cam 10a rotates the winding torque switching lever 11 to switch the winding torque to a strong torque. The position of the follower 12 does not change, and the braking of the reel base 14 remains released.

Therefore, the magnetic tape is fast forwarded or rewound with a strong torque while being stored in the cassette half.

When the motor 1 is rotated from the fast-forward / rewind mode shown in FIG. 2 to rotate the loading cam 3 and the switching cam 10 as shown by the arrow in FIG. 2, the stop mode in the unloading state shown in FIG. 3 is entered. .

In the stop mode in the unloading state, the loading mechanism is in the unloading state, the winding torque switching mechanism is switched to a weak torque by the winding torque switching lever 11, and the follower 12 is further moved to the left in FIG. Is being braked.

When the motor 1 is rotated from the stop mode in the unloading state shown in FIG. 3 to rotate the loading cam 3 and the switching cam 10 as shown by the arrow in FIG. 3, the reproduction mode shown in FIG. 4 is established. .

That is, during the rotation of shifting from FIG. 3 to FIG. 4, the segment gear 4 is rotated by the spiral groove cam 3a, the pole base 8 is moved along the groove 9 accordingly, and the magnetic tape is pulled out from the cassette half. , Attach to the rotating drum. That is, the loading mechanism is in the loading state.

The amount of rotation in the movement from FIG. 3 to FIG. 4 corresponds to about 3/4 rotation of the loading cam 3 and the switching cam 10 because the moving stroll of the pole base 8 is long.

The winding torque switching lever 11 is not rotated, and the winding torque remains weak torque.

However, the follower 12 is moved to the right in FIG. 4 by the braking cam 10b, the braking lever 13 is rotated, and the braking of the reel base 14 is released.

Therefore, in the reproducing mode, the magnetic tape is pulled out from the cassette half and is run with a weak torque while being attached to the rotating drum.

When the motor 1 is rotated from the reproduction mode shown in FIG. 4 and the loading cam 3 and the switching cam 10 are further rotated as shown by the arrow in FIG. 4, the high speed reproduction mode shown in FIG. 5 is established.

In this high speed reproduction mode, the loading mechanism is still in the loading state, but the winding torque switching lever 11 is rotated by the winding torque switching cam 10a and switched to the strong torque. The position of the follower 12 is the same as in FIG. 4, and the braking of the reel base 14 is released.

Therefore, the magnetic tape is pulled out from the cassette half and is run at high speed with a strong torque while being attached to the rotary drum.

When the motor 1 is further rotated from the high speed reproduction mode shown in FIG. 5 to rotate the loading cam 3 and the switching cam 10 as shown by the arrow in FIG. 5, the stop mode in the loading state shown in FIG. 6 is set.

In the stop mode in this loading state, the winding torque is switched to the weak torque by the winding torque switching cam 10a while the loading mechanism remains in the loading state. Further, the follower 12 is moved to the sixth position by the braking cam 10b.
The reel base 14 is moved to the left in the figure, the braking lever 13 is rotated, and the reel base 14 is braked.

In this state, the magnetic tape is pulled out from the cassette half and wound around the rotary drum to stop the traveling.

As will be understood from the above description, in this magnetic tape recording / reproducing apparatus, the loading cam 3, the switching cam 10, and the loading mechanism, the winding torque switching mechanism, and the braking mechanism are mechanically linked. Only the rotation of the motor 1 needs to be controlled, a complicated control circuit is not required, and the harmony of the operation of each mechanism is ensured.

[Advantages of the Present Invention] According to the present invention, a motor, a first cam moved by the motor, a loading mechanism driven by the first cam for loading and unloading a magnetic tape, and the first A second cam that moves in conjunction with the cam and a winding torque switching mechanism that is driven by the second cam to switch the strength of the winding torque of the magnetic tape are provided, and the first cam and the second cam are provided. A magnetic tape recording / reproducing apparatus is provided which is characterized in that the strength of the winding torque can be switched regardless of the loading and unloading states by interlocking the cam, and with the simple structure using the cam. Since the operations of the loading mechanism and the take-up torque switching mechanism are harmonized, the structure is simplified and the harmony of the operations is ensured.

Further, even in the unloading state in which the magnetic tape is not loaded, the winding torque of the magnetic tape can be switched to the strong torque or the weak torque, so that the load is more uniform than in the case of the conventional device which needs to be in the loading state once. Fast forward / rewind can be performed with a strong torque in a state where the magnetic tape is applied, and in this unloading state, one reel stand of the magnetic tape is stopped (braked by the brake) while the other reel stand. By winding the table with a weak torque, it is possible to remove the slack in the tape, and as a result, the magnetic tape is wound up neatly without applying an excessive load, and in addition, such an excessive load does not act. This also contributes to the life of the magnetic tape, and even when the magnetic tape is loaded, the magnetic Since it is possible to wind the tape directly with the strong torque of the reel stand without going through the capstan, pinch roller, or torque limiter, even if the tape take-up speed is greatly increased during fast forward and rewind, the above-mentioned components and magnetic The life of the tape is not impaired, the magnetic tape can be reliably wound up with a strong torque, and the switching between the reproduction state and the fast-forward rewinding state in the loading state can be performed in an extremely short time.

[Brief description of drawings]

1 to 6 are schematic plan views showing a main part of a magnetic tape recording / reproducing apparatus according to an embodiment of the present invention. FIG. 1 is an eject mode, FIG. 2 is a fast-forward / rewind mode, and a third is a third embodiment. FIG. 4 shows the stop mode in the unloading state, FIG. 4 shows the reproduction mode, FIG. 5 shows the high speed reproduction mode, and FIG. 6 shows the stop mode in the loading state. (Explanation of symbols) 1 ... motor, 3 ... loading cam 3a ... spiral groove cam 4 ... segment cam 5,6 ... loading gear 7 ... loading arm 8 ... pole base 9 ... loading guide 10 ... Switching cam 10a Winding torque switching cam 10b Braking cam 11 Rolling torque switching lever 12 Follower 13 Braking lever 14 Reel stand.

Claims (2)

[Scope of utility model registration request] 1. A motor and a first driven by the motor.
Cam, a loading mechanism that is driven by the first cam to load and unload the magnetic tape, a second cam that is moved in conjunction with the first cam,
And a grooved cam provided on the first cam and the second cam, which has a winding torque switching mechanism that is driven by the second cam to switch the strength of the winding torque of the magnetic tape.
The magnetic tape recording / reproducing apparatus is characterized in that the winding torque switching cam provided on the cam switches the winding torque between the loading state and the unloading state. 2. A utility model characterized in that the braking cam provided on the second cam switches between actuation and release of a braking mechanism for braking the running of the magnetic tape in both loading and unloading states. The magnetic tape recording / reproducing apparatus according to claim 1.