JPH0471262B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drive mechanism in a cassette-type tape recorder that allows reverse playback.

[Background technology and its problems]

In contrast to the drive mechanism found in ordinary tape recorders that performs normal playback, fast forwarding, and reverse playback, cassette tape recorders perform reverse playback with a single touch or automatic reversal. In either case, a transmission mechanism is required to change the rotation speed, and the transmission mechanism becomes complicated, making it difficult to downsize.

Therefore, the applicant first switched the transmission mechanism according to the rotational force of the drive system motor when rotating forward or backward, and the forward/backward movement of the head board.
We proposed a compact cassette-type tape recorder that changed the number of rotations of the reel shaft (patent application 1983-
No. 189299), this cassette tape recorder still has the problem of having a large number of transmission gears.

[Purpose of the invention]

The present invention is a further improvement of the above-mentioned cassette type tape recorder, and provides a drive mechanism for a tape recorder which has a simplified mechanism and ensures reliable operation.

[Summary of the invention]

This invention provides a first
a pair of reel stands having a second reel stand gear of a large diameter coupled to the reel pawl via a clutch mechanism; A moving gear that meshes with either one of the reel base gears, and a pair of speed increasing gears that mesh with the pair of first and second reel base gears respectively in the operating state, and in the constant speed drive state, the The pair of speed increasing gears are set in a non-operating state, and in a high-speed driving state, only the speed increasing gear that is not meshed with the moving gear is controlled to be in a non-operating state.

Therefore, it becomes possible to realize a mechanism in which the tape is fast-forwarded and the playback state is simplified.

〔Example〕

FIG. 1 is a plan view of the main parts of the tape recorder drive mechanism of the present invention.

In this figure, 10 is a drive gear that is driven at a constant rotation speed via the pulley 2a of the motor 1, the belt 3, the pulley 4, and the reduction gears 5 and 6, as shown by the two-dot chain line, and 11 is the drive gear. A moving gear 13 is pivotally supported by a swinging lever 12 that meshes with the moving gear 11 and supports its drive shaft, and a partially toothed gear 13 that meshes with the moving gear 11 and slides an F/R switching lever to be described later.

Note that rotational force is supplied from the pulley 2b of the motor 1 to flywheels 9a and 9b connected to two capstan shafts 8a and 8b by a belt 7.

14 and 16 indicate reel stands driven by the moving gear 11, and each reel stand 1
4 and 16, two reel stand gears 14 are connected via a slip mechanism and a clutch mechanism as described later.
a, 14b and 16a, 16b are connected.

Further, 15 and 17 indicate speed increasing drive parts,
The speed increasing drive parts 15, 17 are formed by two speed increasing gears 15a, 15b and 1 which are formed on concentric circles.
7a and 17b are pivotally supported.

When the actuating plate is pressed as described later, the reel base gears 14a, 14b, 16a,
16b is configured to be disengaged.

18 is a magnetic head 19 and a pinch roller 2
The first one moves forward or backward together with 0a and 20b.
This first
When the interlocking lever 18 moves forward, that is, in the constant speed play mode, it controls the speed increasing drive parts 15 and 17 to be inactive, and in the backward mode, that is, in the fast forward (rewind) mode, it is in the position shown in the figure. .

Further, in the embodiment of the present invention, the speed increasing drive section 15,
A second interlocking lever is provided at a position overlapping the first interlocking lever 18 for actuating the first interlocking lever 17.

FIG. 2 shows the second interlocking levers 21a, 21b,
and F/R switching lever 22, the first
The same parts as those in the figure are given the same symbols (the drive system of the motor 1 is omitted).

In this figure, 22c is the pin 1 of the partially toothed gear 13.
3a, the F/R switching lever 22 is slid in the direction of the arrow F/R by rotation of the pin 13a.

There are elongated holes 22 with steps at both ends of the switching lever 22.
a, 22b are formed, and these elongated holes 22a, 22b
The dowels 23a, 23b of the second interlocking levers 21a, 21b are loosely fitted into the dowels 23a, 23b.

Therefore, by sliding the F/R switching lever 22 left and right, the second interlocking levers 21a and 21b
moves up and down in the opposite direction, and the speed increasing drive section 15,1
Activate 7.

Although not shown, the pinch rollers 20a and 20b are controlled to alternately come into pressure contact with the capstan shafts 8a and 8b by sliding the F/R switching lever 22, and the azimuth angle of the magnetic head 19 is adjusted to the tape position as required. It is controlled to change depending on the direction of travel.

3 and 4 show the coupling relationship between the first interlocking lever 18, the second interlocking levers 21a, 21b, the speed increasing drive parts 15, 17, and the reel stands 14, 16. .

In this figure, one speed-increasing drive unit 15 has two speed-increasing gears 15a, 15b rotatably supported by a shaft 15c embedded in a base plate 24, and these speed-increasing gears 15a, 15b are rotated upwardly. Belleville spring 1 is biased against
5d, an actuating plate 15e, and a pin 15f supporting the actuating plate 15e, and is connected to the reel stand 14 when the disc spring 15d is lifting up the speed increasing gears 15a and 15b as shown in the figure. It is in a position where it meshes with the reel stand gears 14a and 14b. However, the first and second interlocking levers 1 that are slidably supported on the base plate 24
8, 21a, 21b move as shown by the dotted line arrow and press the actuating plate 15e, the actuating plate 15e pushes the speed increasing gears 15a, 15b downward as shown by the dotted line against the disk spring 15d. Become.

Therefore, the meshing between the speed increasing gears 15a, 15b and the two reel stand gears 14a, 14b of the reel stand 14 is released.

A reel stand gear 14a is loosely fitted into the reel stand 14, and its rotational force is applied to a clutch sleeve 14c, a clutch mechanism consisting of a coil spring 14d wound around the clutch sleeve 14c, and a slip pressed by a spring 14f. It is transmitted to the reel pawl 14g via a slip mechanism consisting of a plate 14e.

Further, another reel base gear 14b (having a smaller diameter than the reel base gear 14a) is connected to the reel pawl 17g so as to rotate integrally therewith.

Since the drive mechanism of the tape recorder of the present invention has the above-described configuration, in the normal playback mode in which the motor 1 is rotating in the direction of the solid arrow in FIG. It meshes with the reel stand gear 16a of the reel stand 16, and winding rotational force is supplied to the reel stand 16 via the clutch mechanism and slip mechanism shown in FIG. In this normal reproduction mode, the tape runs while being pressed by the capstan shaft 8b and the pinch roller 20b, and the magnetic head 19 is also controlled to the forward position. Therefore, since the first interlocking lever 18 is moving upward (in the direction of arrow A), the actuating plate 15 is moved upward (in the direction of arrow A).
e and 17e are in a pressed state, and the meshing of the speed increasing gears 15a, 15b, 17a, 17b and the reel stand gears 14a, 14b, 16a, 16b is released (hereinafter, this state will be referred to as inactive). state).

When the rotational direction of the motor 1 is reversed in this normal playback mode, the moving gear 11 moves to the reel stand gear 1 on the reel stand 14 side, as shown by the dotted line in FIG.
It will mesh with 4a. Therefore, rotational force is supplied to the reel stand 14, and the tape is wound in a reverse playback mode in the same way as the reel stand 16, but at this time, as the moving gear 11 moves, the partially toothed gear 13 moves in the direction of the dotted arrow. Since it is rotationally driven, the F/R switching lever 22 slides in the R direction by the pin 13a and the cam portion 22c, and although not shown, the pinch roller 20b separates from the capstan shaft 8b, and the pinch roller 20a moves away from the capstan shaft. 8a and runs the tape in the opposite direction.

Next, a case will be described in which the normal playback mode shown in FIG. 1 is controlled to fast forward mode.

In this case, an operation mechanism (not shown) moves the head board, that is, the first interlocking lever 18 to the arrow B.
As shown in FIGS. 3 and 4, the actuating plates 15e and 17 of the speed increasing drive units 15 and
e is pushed up by the disc springs 15d and 17d, and the speed increasing gears 15a, 15b, 17a, 17b mesh with the reel base gears 14a, 14b, 16a, 16b (this state is referred to as an operating state).
However, in this case, one speed-increasing drive section 17 is activated, as will be described later.

Then, as explained in FIG. 4, the rotational force of the reel base gear 16a is transmitted to the reel base gear 16b via the speed increasing gears 17a and 17b. Then, the reel base gear 16b, whose rotation speed has increased, moves to the reel pawl 1.
6g, the tape is wound at high speed.

In this case, of the clutch sleeve 16c and coil spring 16d that make up the clutch mechanism, a rotational force is applied in the direction in which the coil spring 16d loosens, so a so-called unidirectional clutch action occurs, causing the coil spring 16d and the clutch to loosen. The connection of the sleeve 16c is a loose connection, and the reel claw 16g
The rotational force for is supplied from the reel base gear 16b rotating at high speed.

In addition, in this fast forward mode, the pinch roller 20
a, 20b are retracted, and the capstan shaft 8
Needless to say, it will move away from a and 8b.

By the way, when the other speed-up drive section 15 is in operation in this fast-forward mode, the reel stand 14
The frictional force in the clutch mechanism and slip mechanism increases the back tension of the tape, resulting in a loss of winding rotational force.

However, in the drive mechanism of the present invention, as explained in FIG. Since the reel stand 14 and the speed increasing gears 15a, 1
5b is disengaged. Therefore, the reel stand 14 dispenses the tape in a free state, which has the effect of saving battery power.

Note that this is the opposite of the above explanation for rewinding.
The reel stand 14 rotates at high speed to rewind the tape, and at this time the speed increasing gears 17a, 17b and the reel stand gear 1
The engagement between 6a and 16b is released.

〔Effect of the invention〕

As described above, the drive mechanism of the present invention has the advantage of being able to reduce the number of transmission gears as compared to the prior art, and at the same time ensuring reliable operation. Additionally, since the mechanism is simplified, wow and flutter are improved, and gear noise is also reduced.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the main parts of the drive mechanism of the tape recorder of the present invention, FIG. 2 is a plan view for explaining the operation of the drive mechanism, and FIG. A side view showing the relationship of the second interlocking lever;
FIG. 4 is a side view showing a partial cross section of the speed-increasing drive unit and the reel stand. In the figure, 11 is a moving gear, 14, 16 are reel stands, 14a, 14b, 16a, 16b are reel stand gears, 15, 17 are speed increasing drive units, 15a, 15
b, 17a, 17b are speed increasing gears, 18 is a first interlocking lever, and 21a, 21b is a second interlocking lever.

Claims (1)

[Claims] 1. A first reel base gear that integrally rotates a reel pawl that engages with the reel hub of the tape cassette, and a clutch mechanism that is engaged between the first reel base gear and the reel pawl. a pair of reel stands having a large-diameter second reel stand gear; a moving gear that moves in response to forward and reverse rotation of the motor and meshes with one of the second reel stand gears to drive the rotation; a pair of speed increasing gears movably disposed near the pair of reel stands and meshing with the first reel stand gear and the second reel stand gear when moved to an operating position; In a constant speed drive state in which the board moves forward, the first interlocking mechanism moves the pair of speed increasing gears to a non-operating position, and in a high speed drive state in which the head board is in a backward position, the moving gear meshes. A drive mechanism for a tape recorder, characterized in that a second interlocking mechanism is provided for moving only the speed increasing gear on the side of the reel stand that is not in operation to a non-operating position.