JPS6131400Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive device for a tape recorder that can perform fast forwarding and rewinding of a tape.

First, an example of a conventional tape recorder drive device will be briefly described with reference to FIG. In the figure, 1 is the first gear provided on the reel stand on the winding side;
indicates a second gear provided on the reel stand on the supply side, an intermediate third gear 3 is always meshed with the first gear 1, and further between the third gear 3 and the second gear 2. A fourth gear 4 is arranged. The fourth gear 4 is rotationally driven by a flywheel 6 of a capstan shaft 5 serving as a rotational drive source via a drive belt 7, and is selectively meshed with the third gear 3 or the second gear 2. , is supported by a substantially T-shaped support planar 9 that is rotatable about one pivot shaft 8. A fast forward operating lever 12 and a rewind operating lever 13 are disposed close to one end 9A and the other end 9B of the support plate 9, respectively, and are movable in the longitudinal direction by means of a long groove 10 and a guide pin 11 that engages therewith. When the fast-forward operating lever 12 is operated in the direction of the arrow, one end 9A of the support plate 9 is pushed, and the support plate 9 is rotated clockwise in the figure around the pivot 8, so that the fourth gear 4 moves to the position indicated by the reference numeral 4. As shown by ', the first gear 1 is engaged with the third gear 3 and driven to rotate, resulting in a fast-forward state, and when the rewind operating lever 13 is operated in the direction of the arrow, the support plate 9 is rotated around the pivot 8. The fourth gear 4 is rotated counterclockwise in the figure, and the fourth gear 4 meshes with the second gear 2 as shown by the reference numeral 4'', and the second gear 2 is rotationally driven to be in the rewinding state. Reference numeral 14 indicates a return spring installed in each lever 12 and 13.

In such a drive device, the fourth gear 4
When selectively meshing with the second gear 2 or the third gear 3, respectively, it is desirable that the fourth gear 4 mesh with the respective gears 2 or 3 at a so-called bite angle. That is, when the gears are meshed with a biting angle, the meshing state between both gears is good, the transmitted torque is large, and reliable driving can be obtained. However, in a structure in which the support plate 9 is rotated left and right about one pivot shaft 8 to mesh the fourth gear 4 with the second gear 2 or the third gear 3, respectively, as shown in FIG. If one meshes at the biting angle, the other will not mesh at the biting angle, so the fourth gear 4 is set at the optimum biting angle for both the second gear 2 and the third gear 3. It was impossible to make them mesh.

In view of the above, the present invention provides a tape recorder drive device which is capable of engaging the drive gear with both the take-up side and the supply side gear at an optimum biting angle when fast-forwarding and rewinding the tape, thereby ensuring reliable fast-forwarding and rewinding drive.

Hereinafter, an example of a tape recorder driving device according to the present invention will be explained using FIGS. 2 to 4.
Note that parts in the drawings that correspond to those in FIG. 1 are given the same reference numerals.

In the present invention, as shown in FIG. 2, a first gear 1 integrally provided on the reel stand on the take-up side and a second gear 2 integrally provided on the reel stand on the supply side are separated by a predetermined interval. The intermediate gear, that is, the third gear 3 is always meshed with the first gear 1, and
A driving gear, ie, a fourth gear 4, which can selectively mesh with the third gear 3 or the second gear 2, is disposed between the third gear 3 and the second gear 2. 4th gear 4
An elastic drive belt 7 is stretched between a flywheel 6 and a capstan 5 serving as a rotational drive source, so that the flywheel 6 rotates. On the other hand, a support plate 20 is provided, and the fourth gear 4 is rotatably supported at its first end 20A. This support plate 20 has two support posts 1
6 and 17 and selectively pivotable about the first support post 16 or the second support post 17.
The through holes 18 and 19 that engage with the holes 7 are formed sufficiently large. Here, the fourth gear 4 corresponds to the apex of a triangle whose base is the line connecting the support posts 16 and 17, and is located between the support posts 16 and 17, the fourth gear 4, and the flywheel 6. Under normal conditions, it is supported in a so-called neutral position in which it does not mesh with the second gear 2 and the third gear 3 by an elastic drive belt 7 that is stretched over the gear. Also, a fast forward operation lever 12 and a rewind operation lever 13
are arranged so as to be movable in the longitudinal direction by guide pins 11 that engage with the long grooves 10, respectively, and each lever 1
2 and 13 are placed close to and opposite to a second end 20B and a third end 20C of the support plate 20 extending in the left-right direction, that is, in the direction connecting the support posts 16 and 17. A return spring 14 is interposed in each of the levers 12 and 13. Note that when the support plate 20 rotates around the second support post 17, the reference numeral 21 abuts and supports the second end portion 20B at a rotational position where the fourth gear 4 just meshes with the third gear 3. This is a first stopper that prevents further rotation of the plate 20. Further, when the support plate 20 rotates around the first support post 16, 22 contacts the first end portion 20C at a rotation position where the fourth gear 4 just meshes with the second gear 3. This is a second stopper that prevents further rotation of the support plate 20, and this uses, for example, the edge of the notch 23 provided in the mechanical board, and in this case, the first end of the support plate 20 The portion 20A is arranged within this notch portion 23.

Next, the operation of this configuration will be explained. When the fast-forward operation lever 12 is operated in the direction of the arrow, the end of the lever 12 moves the support plate 2 as shown in FIG.
0 is pushed up, the support plate 20 rotates around the second support post 17, and accordingly, the fourth gear 4 moves and meshes with the third gear 3. Ru. As a result, the rotational driving force is transmitted to the first gear 1 via the flywheel 6, the drive belt 7, the fourth gear 4, and the third gear 3, resulting in a fast forwarding state. Next, when the rewind operation lever 13 is operated in the direction of the arrow, the third end 20C of the support plate 20 is pushed up by the end of the lever 13, as shown in FIG. It rotates around the support post 16, and accordingly, the fourth gear 4 moves and meshes with the second gear 2, and similarly, the rotational driving force from the flywheel 6 is transmitted to the second gear 2. and enters the rewind state.

However, in this case, the support plate 20 is supported by the two support posts 16 and 17, which serve as fulcrums, and during fast forwarding and rewinding, the support plate 20 is supported by the support posts 17 and 16, which are respectively different fulcrums.
0 is rotated and the fourth gear 4 is meshed with the respective gear 3 or 2. For example, by adjusting the position of the first support post 16, the fourth gear 4 is rotated and the fourth gear 4 is meshed with the respective gear 3 or 2. By adjusting the position of the second support post 17, the fourth gear 2 can be meshed with the second gear 2 at an optimal biting angle.
The third gear 4 can be meshed with the third gear 3 at an optimal biting angle. That is, in the fast forwarding state, as shown in FIG.
If the gear 4 meshes with the third gear 3 at the lower position in the figure, it will be in the biting direction, and if it meshes at the upper position, it will be in the escape direction. Also, in the rewind state, the 4th
As shown in the figure, the fourth gear 4 is connected to the second gear with the line connecting the axial center of the fourth gear 4 and the axial center of the second gear
If the gear 2 is engaged with the gear 2 at the upper position in the figure, it will be in the biting direction, and if it is engaged in the lower position, it will be in the escape direction.

As described above, according to the present invention, two pivot points formed by the first and second support posts 16 and 17 are provided for one support plate 20 supporting the drive gear 4, so that the fourth gear 4 is meshed with both the second gear 2 and the third gear 3 with an optimal biting angle, and the transmitted torque is increased to ensure fast forwarding and rewinding drive.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a conventional tape recorder drive device, FIG. 2 is a plan view showing an example of a tape recorder drive device according to the present invention, and FIGS. 3 and 4 are plan views showing operating states. It is a diagram. 1 is the first gear, 2 is the second gear, 3 is the third gear, 4 is the fourth gear, 6 is the flywheel, 1
6 and 17 are support posts, and 20 is a support plate.

Claims (1)

[Scope of utility model registration request] A first gear provided on one reel stand, a second gear provided on the other reel stand, a third gear disposed so as to constantly mesh with the first gear, and a rotational drive source. A reel stand drive device comprising a fourth gear rotationally driven via a drive belt by the rotation of the reel stand drive device, the first and second support posts;
The fourth gear is rotatably supported, and is inserted into each of the first and second support posts and selectively abuts one of the first and second support posts. A through hole is formed, which consists of a tapered rotation receiving part that is rotated and a relief part when it is rotated in contact with the other support post. further comprising a support plate each having an operated part to be operated,
Due to the elasticity of the drive belt, each rotation receiver of the support plate is brought into contact with the first and second support posts to hold the fourth gear in the neutral position, and the fourth gear is held in the neutral position. By operating the operating lever, the support plate is selectively rotated about the first or second support post, so that the fourth gear becomes the second gear or the third gear. A tape recorder drive device designed to mesh with each other at the biting angle.