JPS6123578B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fast forward drive mechanism for a tape recorder or the like.

Such a conventional drive mechanism has a complicated structure, which results in high costs and a high incidence of defects.

This is mainly caused by the driving force transmission mechanism, as explained below.

FIG. 5 shows a conventional transmission mechanism, which will be explained. FIG. 5 shows the FF state, and the rotation of the flywheel 1 is transmitted from the gear part 17b to the take-up reel stand 2 via the rubber roller part 17a of the roller 17.

Next, in the REW state, the roller 17 moves to the rotation conversion gear 6 side, and the rotation of the flywheel 1 is transmitted from the gear part 17b to the rotation conversion gear 6 via the rubber roller part 17a of the roller 17, and the supply reel stand 4 is transmitted to. At this time, the take-up reel stand 2
Transmission to the supply reel base 4 is performed via the flywheel 1 → roller 17 → take-up reel base 2, while transmission to the supply reel base 4 is performed via the flywheel 1 → roller 17 → rotation conversion gear 6 → supply reel base 4. It can be transmitted via. Therefore, in order to make the rotational torque and rotational speed to the take-up reel stand 2 and the supply reel stand 4 the same, it is necessary to increase the slip force of the slip mechanism of the roller 17, but if this is done, the winding of the cassette tape will be difficult. This is not desirable as the tape may break.

Also, if the slip force of roller 17 is weakened, FF
Since there is a rotation conversion gear 6 between the time and the REW time, a torque loss occurs correspondingly, resulting in a difference in rotational torque. In this case, even if smooth rotation is obtained at the end of tape winding during FF, smooth rotation may not be obtained at the end of tape winding during REW.

The present invention solves the above-mentioned drawbacks and also prevents noise generation when gears are engaged.

The following description will be made with reference to the drawings. As shown in FIG. 1, the fast feed rollers 8 and 10 are rotatably attached to roller shafts 9 and 11 fitted to each V-shaped tip of a lever 12.

As shown in FIG. 1a, the fast feed roller 8 includes a gear part 8a, a rubber roller part 8b, a rubber tire 8c,
It is composed of a felt 8d, a spring 8e, and a stopper 8f. That is, the gear part 8a is pressed by the force of a spring 8e against a rubber roller part 8b to which a rubber tire 8c and a felt 8d are attached, and is structured to slip when a certain rotational torque difference occurs between the felt parts 8d and 8d. .

The slip force between the gear portion 8a and the rubber roller portion 8b can be adjusted by changing the pressing force of the spring 8e. That is, the fast-feeding roller is designed to allow adjustment of the transmitted torque as it rotates.

The rapid feed rollers 10 and 17 in FIG. 5 also have a similar structure. Figure 1 shows the rapid feed rollers 8 and 10.
FIG. 2 is a side view showing the state in which is in an intermediate position.

Now, FIG. 3 shows the REW state. When the REW button (not shown) is pressed, a lever (not shown) linked thereto pushes the lever 12 in the direction of arrow A. Then, the lever 12 of the fast feed roller 8 rotates in the direction of arrow A around the lever shaft 13, so the gear part 8a engages with the gear part of the rotation conversion gear 6, and the rubber roller part 8b comes into pressure contact with the flywheel 1. , the rotation of flywheel 1 is fast forwarding roller 8
→ Rotation conversion gear 6 → Transmitted to supply reel stand 4.

Next, FIG. 4 shows the FF state, and when the FF button (not shown) is pressed, the linked lever (not shown) pushes the lever 12 in the direction of arrow B. Then, the lever 12 of the fast-feeding roller 10 is moved to the lever shaft 13.
The gear rotates in the direction of arrow B about the axis, so the gear part engages with the gear part of the take-up reel stand 2, and the rubber roller part comes into pressure contact with the flywheel 1, causing the flywheel 1 -> fast feed roller 10 -> take-up. Reel stand 2
transmitted to.

According to the present invention, by providing fast feed rollers independently for FF/REW, the slip force of each fast feed roller 8, 10 can be adjusted to eliminate the difference in rotational torque during FF/REW. can. Further, the structure and rotational fulcrum of the lever 12 are changed to the flywheel 1 after the gear portions of the fast feed rollers 8, 10 engage with the rotation converting gear 6 and the gear portion of the take-up reel stand 10.
By determining that the rubber roller portions 0 are in pressure contact with each other, it is possible to prevent noise generated when the gears are engaged with each other.

As described above, according to the present invention, with a simple configuration, it is possible to eliminate the difference in rotational torque between FF and REW, and also to reduce noise when gears are engaged.

Furthermore, in the present invention, the first and second rollers are provided exclusively for the two reel stands, and both rollers are selectively brought into contact with and separated from the flywheel by swinging the lever. Since the amount of movement can be minimized, and therefore the amount of movement of the operating means for operating the lever can also be reduced, it is possible to downsize the tape recorder.

Incidentally, the rotation of the flywheel 1 from a motor (not shown) is transmitted through a belt (not shown).

[Brief explanation of the drawing]

FIG. 1 shows the fast-forward drive mechanism of the present invention.
A plan view of the mechanism in a state other than FF/REW,
Figure 1a is a partial sectional view of the rapid feed roller, Figure 2 is a side view of the mechanism in Figure 1, and Figure 3 is FF.
FIG. 4 is a plan view of the mechanism in the REW state, and FIG. 5 is a diagram used to explain the transmission mechanism in the conventional fast-forward drive mechanism of a tape recorder or the like. .

Claims (1)

[Claims] 1. A lever that includes first and second reel stands, a flywheel, first and second roller shafts at spaced apart positions and is pivotably supported; It is composed of first and second rollers that are pivotally connected to a second roller shaft and can move toward and away from the flywheel, and a rotation conversion wheel that transmits the rotation of the first roller to the first reel stand. The first and second rollers are each configured to be able to adjust the transmission torque, and by rotating the lever in the first or second direction, the first and second rollers are selected for the flywheel. A fast-forward drive mechanism for a tape recorder or the like, wherein the rotation of the flywheel is selectively transmitted to the first and second reel stands by bringing the flywheel into contact with the first and second reel stands.