JPH0341300Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cassette tape drive device, and in particular, the present invention relates to a drive device for a cassette tape, and in particular, the rotation of a drive gear is selectively transmitted to a pair of reel gears via a clutch gear pivotally supported by a lever. The present invention relates to a cassette tape drive device that rotates the cassette tape in the forward or reverse direction by transmitting information to the cassette tape.

[Conventional technology]

In conventional devices of this type, a clutch gear and a transmission pinion are generally supported by a lever that can swing between a pair of reel gears, and the clutch gear or the clutch gear and the transmission pinion are supported by a lever that can swing between a pair of reel gears. The rotation from the drive gear is transmitted to either one of the reel gears through the reel gear to rotate the cassette tape in the forward or reverse direction.

[The problem that the idea aims to solve]

However, taking normal rotation of a cassette tape as an example, when the rotation of the drive gear is transmitted to one reel gear via the clutch gear, the clutch gear meshes with the drive gear and the reel gear at the same time. This had the disadvantage that it was difficult to mesh because it had to mesh at two places, and the impact noise caused by the collision of the gear teeth became louder.

The purpose of the present invention is to facilitate the meshing between the clutch gear and the drive gear as well as between the clutch gear or the transmission pinion gear and the reel gear, in order to eliminate the drawbacks of the prior art as described above, and to reduce the impact noise caused by the collision of gear teeth. It is an object of the present invention to provide a cassette tape drive device that can reduce the number of cassette tapes.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a drive gear, a pair of reel gears, a lever that can swing between these reel gears, a clutch gear and a small transmission gear that are pivotally supported by the lever and mesh with each other. The cassette tape is rotated in the forward and reverse directions by selectively transmitting the rotation of the drive gear to either one of the reel gears via the clutch gear or the clutch gear and the transmission pinion gear. In the cassette tape drive device, a spring for elastically biasing the lever is provided, and a long hole into which the first guide shaft of the lever is inserted, and a second guide shaft.
a cam hole having two protrusions into which a guide shaft is inserted, and when the lever swings, one of the protrusions moves on the circumferential surface of the second guide shaft against the spring. Accordingly, the clutch gear is configured to mesh with the drive gear before the clutch gear or the transmission small gear meshes with the reel gear.

[Example of idea]

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in Figure 1, the fixed frame (not shown) has
The first reel gear 1 and the second reel gear 2 are connected to the shaft 1a.
and a shaft 2a, and a drive gear 3 is also rotatably provided around a shaft 3a. A lever 4 arranged to extend from approximately midway between the first reel gear 1 and the second reel gear 2 to the drive gear 3 is connected to first and second guide shafts 5 and 6 provided on the fixed frame. is inserted into the elongated hole 7 and cam hole 8 formed in the lever 4, so that the upper part can swing between the pair of reel gears 1 and 2,
Furthermore, the reel gears 1 and 2 can be moved up and down in the direction of approaching and separating them.

This lever 4 has a protruding part 4a that protrudes diagonally to the left at the upper part, and a shaft body 9 is formed at the tip of this protruding part 4a, and the shaft body 9 is rotatably provided on a fixed frame. It is engaged with the forked portion 10a of the operating lever 10. Furthermore, a clutch gear 11 consisting of a large-diameter gear 11a and a small-diameter gear 11b is rotatably supported approximately at the center of the lever 4, and a clutch gear 11 is rotatably supported approximately at the center of the protrusion 4a. A small transmission gear 12, which is always in mesh with a small diameter gear 11b, is rotatably supported.

As is clear from FIG. 2, the elongated hole 7 of the lever 4 is formed long in the extending direction of the lever 4, while the cam hole 8 of the lever 4 has a substantially triangular shape, and the cam hole 8 of the lever 4 has a substantially triangular shape. A first protrusion 13a is formed on the side opposite to the gear 3, and a second protrusion 13b is formed on the side opposite to the pair of reel gears 1 and 2, and a recess 1 is formed between the protrusions 13a and 13b.
It is 3c.

Reference numeral 14 denotes a spring stretched between a pin 15 implanted in the fixed frame and a protrusion 4b formed on the lower right side of the lever 4, which pulls up the lever 4 when not in operation as shown in FIG. , the position where the lower edge of the elongated hole 7 and the first guide shaft 5 as well as the recess 13c of the cam hole 8 and the second guide shaft 6 come into contact with each other, that is, the drive gear 3 rotates to either of the reel gears 1 and 2. It is arranged to hold the lever 4 in a neutral position where no force can be transmitted.

Therefore, during normal rotation as shown in FIG.
Then, the cam holes 8 are guided by the second guide shafts 6, so that the protrusion 4a swings in a rightward direction. By tilting the lever 4 in this way, the large diameter gear 11a of the clutch gear 11 meshes with the drive gear 3, and the small diameter gear 1
1b meshes with the second reel gear 2,
The driving force of the drive gear 3 is transmitted to the second reel gear 2 via the clutch gear 11.

On the other hand, when reversing as shown in Fig. 4, the operating lever 1
When the lever 4 is rotated in the direction of arrow B, the elongated hole 7 and the cam hole 8 are guided by both guide shafts 5 and 6, and the lever 4 swings in a direction in which the protrusion 4a is tilted to the left. By tilting the lever 4 in this way, the large diameter gear 11a of the clutch gear 11
meshes with the drive gear 3, and the small diameter gear 11b is meshed and connected with the first reel gear 1 via the transmission pinion 12, so that the driving force of the drive gear 3 connects the clutch gear 11 and the transmission pinion 12. The signal is transmitted to the first reel gear 1 via.

By the way, in the forward rotation and reverse rotation operations described above, the large diameter gear 11a and the small diameter gear 11 of the clutch gear 11
b or the transmission pinion 12 is simultaneously connected to the drive gear 3.
It is operated as shown in FIGS. 5 and 6 so as not to mesh with the first reel gear 1 or the second reel gear 2.

That is, during normal rotation as described above, when the lever 4 is tilted, the positional relationship between the cam hole 8 and the second guide shaft 6 shifts from the positional relationship shown in FIG. 1 to the positional relationship shown in FIG. 3. , since the second protrusion 13b moves relatively along the circumferential surface of the second guide shaft 6,
As shown in FIG. 5, the second guide shaft 6 acts to press down the second protrusion 13b of the cam hole 8. Therefore, due to the cooperative action of the second guide shaft 6 and the cam hole 8, the lever 4 moves downward and toward the drive gear 3, and the large diameter gear 11a of the clutch gear 11 and the drive gear 3 are moved together. When the lever 4 is further tilted, the second guide shaft 6 gets over the second protrusion 13b under the tension of the spring 14, and as shown in FIG. 3, the small diameter gear of the clutch gear 11 This enables meshing between the second reel gear 11b and the second reel gear 2.

In this way, in the above embodiment, the clutch gear 1
1 first meshes with the drive gear 3, and then meshes with the second reel gear 2, so there is no difficulty in meshing due to meshing at two places at the same time as in conventional devices, and the teeth of the gears This can reduce the impact noise caused by collisions.

In addition, in the operation process during reverse rotation shown in Fig. 6, the first
During the transition from the positional relationship between the cam hole 8 and the second guide shaft 6 shown in the figure to the positional relationship shown in FIG. act. Therefore, the lever 4 moves downward and toward the drive gear 3 while tilting due to the cooperative action of the second guide shaft 6 and the cam hole 8, and the large diameter gear 11a of the clutch gear 11 and the drive gear 3 When the lever 4 is further tilted, the second guide shaft 6 climbs over the first protrusion 13a, and as shown in FIG.
This enables meshing with the reel gear 1. Therefore, in this case as well, when each gear meshes, two positions do not mesh at the same time.

[Effect of idea]

As explained above, according to the present invention, when transmitting driving force from the drive gear to the reel gear via the clutch gear or the clutch gear and the transmission pinion, each gear can mesh at two locations at the same time. Therefore, not only can the gears mesh smoothly, but also the loud impact noise caused by the collision of the teeth of the gears can be reduced.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention. Figure 1 is a top view showing the main parts of the drive device, Figure 2 is an enlarged view of the main parts of the lever, and Figure 3 shows only the drive part during forward rotation. Fig. 4 is a top view showing only the driving part during reverse rotation, Fig. 5 is a top view showing one process before reaching normal rotation transmission, and Fig. 6 is a top view showing one process before reaching reverse rotation transmission. FIG. 1...First reel gear, 2...Second reel gear, 3...Drive gear, 4...Lever, 5...First
Guide shaft, 6...Second guide shaft, 7...Elongated hole, 8
...Cam hole, 11...Clutch gear, 12...Transmission pinion gear, 13a, 13b...Protrusion, 14...Spring.

Claims (1)

[Scope of utility model registration request] It includes a drive gear, a pair of reel gears, a lever that can swing between these reel gears, and a clutch gear and a transmission pinion that are pivotally supported by the lever and mesh with each other, and the rotation of the drive gear is controlled by the clutch gear. Alternatively, by selectively transmitting the information to either one of the reel gears via the clutch gear and the transmission pinion gear, the positive and
In a cassette tape drive device that performs reverse rotation,
A spring for elastically biasing the lever is provided, and a long hole into which the first guide shaft is inserted and a cam hole having two protrusions into which the second guide shaft is inserted are respectively formed in the lever. When the lever swings, one of the protrusions moves on the circumferential surface of the second guide shaft against the spring, so that the clutch gear or the small transmission gear meshes with the reel gear. A cassette tape drive device, characterized in that the clutch gear is configured to mesh with the drive gear prior to the operation.