JPH0548268Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application This invention relates to the rotation mechanism of a magnetic recording device such as a tape recorder or a video tape recorder, and more particularly to a reel table drive mechanism for rotating a supply reel table and a take-up reel table at low or high speeds.

(b) Prior Art Conventionally, in the rotation mechanism of this type of magnetic recording device, a drive gear is movably provided between a take-up reel stand and a supply reel stand, and for example, during FWD playback or FWD fast forwarding, the drive gear is directly rotated. The magnetic tape (hereinafter referred to as tape) is run by meshing with the take-up reel stand, and meshing with the supply reel stand via an idler gear during REV playback and REV rewinding, and rotating the supply reel stand in the opposite direction to the above. It was reversing direction. During playback, the tape is meshed with the reel stand via a slip gear to feed the tape at low speed, and during fast forwarding or rewinding, the tape is fed at high speed.

(c) Problems to be solved by the invention However, the above rotation mechanism requires a transmission mechanism to the rewind reel stand and the supply reel stand in addition to the drive gear, which not only complicates the structure but also makes it difficult to operate the rotation mechanism. It was difficult to make it smaller. Therefore, great operating power was also required.

This idea was made in view of the above circumstances, and its purpose was to simplify and downsize the structure of the rotating mechanism, thereby reducing the operating force required for switching between FWD playback and REW playback, as well as fast forwarding and rewinding operations. It's about letting people know.

(d) Means and operation for solving the problem This invention provides a magnetic tape having a rotation mechanism that selectively rotates a supply reel stand and a take-up reel stand via a transmission means in accordance with the rotational direction of the drive means. The recording device includes: a drive gear having large-diameter teeth and small-diameter teeth and rotated by transmission of the rotational driving force of a motor; a rotation lever that rotates about the rotation center of the drive gear; and a rotation lever. It has a small-diameter intermediate gear that is provided on the top and can mesh with the large-diameter teeth of the drive gear, and a large-diameter intermediate gear that can mesh with the small-diameter teeth of the drive gear and moves and rotates in the axial direction together with the small-diameter intermediate gear. an intermediate gear means in which the small-diameter intermediate gear and the large-diameter tooth portion of the drive gear selectively mesh with each other or the large-diameter intermediate gear and the small-diameter tooth portion of the drive gear by movement in the axial direction; A switching lever for moving the intermediate gear in the axial direction is provided on the rotating lever, and is always in mesh with the small-diameter intermediate gear, and as the rotating lever rotates, the gear on the supply reel stand and the take-up reel stand an idler gear that selectively meshes with the teeth of the magnetic tape, and a means for operating a rotary lever according to the rotational direction of the motor; A rotating mechanism for a magnetic tape recording device, characterized in that the rotating mechanism is configured to switch the speed direction and the speed direction.

(E) Embodiment An embodiment of this invention will be described below with reference to FIGS. 1 to 5. Note that this invention is not limited thereby.

FIG. 1 is a plan view of a reel stand driving device of a tape recorder in a stopped state, and FIG. 2 is a sectional view of the reel stand driving device during playback.

In FIGS. 1 and 2, 1 is the main body chassis of the tape recorder, 2 is a supply reel stand, and 3 is a take-up reel stand. are rotatably attached to each. Teeth portions 6 and 7 are formed on the peripheries of both reel stands 2 and 3, respectively.
Reference numeral 8 denotes an idler gear that engages with teeth on either one of the reel stands 2 and 3, and is rotatably attached to an idler shaft 10 protruding from a rotating lever 9, which will be described later. It is possible to move between the take and reel stand 3. Teeth 11 are formed on the periphery of the idler gear 8.

The rotary lever 9 is made of a plate-like member whose hole provided at one end is fitted into a drive shaft 24 (described later), and is rotatable about the drive shaft 24. are provided protrudingly at predetermined intervals.

The tooth portion 11 of the idler gear 8 is similar to the tooth portion 13 of the first intermediate gear 12 which has a small diameter and has an approximately T-shaped cross section.
This first intermediate gear 12 is pivotally attached to an intermediate gear shaft 14 that projects from the rotary lever 9 . Also, the outer wall trunk portion 1 of the first intermediate gear 12
A second intermediate gear 16 having a large diameter and having teeth 15 formed on its peripheral edge is press-fitted into the first intermediate gear 2a.
A spring 17 is inserted between the intermediate gear 12 and the second intermediate gear 16, and a spring 19 is also inserted between the upper surface of the first intermediate gear 12 and a stop washer 18 attached to the upper end of the intermediate gear shaft 14. ing. An annular stopper 21 is in contact with the lower surface of the second intermediate gear 16 via an annular felt 20 as a cushioning material, and this stopper 21 is fixed to the first intermediate gear outer wall trunk 12a. It supports the second intermediate gear 16.
Further, the first intermediate gear 12 has a slip mechanism between it and the second intermediate gear 13 due to the mutual action of the spring 17, the felt 20, and the stopper 21. This is because a pressing force is constantly applied to the second intermediate gear 16 due to the bias of the spring 19, causing a slip between the felt 20 and the second intermediate gear 16.

Further, reference numeral 22 denotes a switching lever, which has a substantially U-shaped groove 22a at its end that can slide while sandwiching the body of the daytime gear shaft 14, and has an inclined surface 22b near this end. The first intermediate gear 1 is made of plate-like members formed with different thicknesses.
The end portion thereof is inserted between the lower end surface of the cylinder No. 2 and the upper surface of the rotary lever 9. and switching lever 2
2 slides, the inclined surface 22b functions to raise or lower both the first intermediate gear 12 and the second intermediate gear 16 against the bias of the spring 19. In this way, the second intermediate gear 16
is located below the first intermediate gear 12, and both intermediate gears 12 and 16 are supported at predetermined positions, respectively.

Reference numeral 23 denotes a drive gear, which is rotatably attached to a drive shaft 24 protruding from the main body chassis 1, and is connected to both intermediate gears 12, 16.
It has a tooth portion 25 that engages with the second intermediate gear 16 when the intermediate gear 16 does not rise, and a tooth portion 26 that engages with the first intermediate gear 12 when both intermediate gears 12 and 16 rise,
A groove portion around which a belt 28 for transmitting the driving force of the motor 27 is wound is formed on the upper outer periphery of the tooth portion 26 .

Note that 30 and 31 are connected to the motor 2 via the belt 28.
This is the flywheel to which the drive of No. 5 is transmitted.

Next, the operation of this embodiment will be explained.

First, from the stopped state in Figure 1, switch to FWD (Forward).
The case of setting the playback state will be explained. motor 2
When 7 is rotated in the direction of arrow D, driving force is transmitted to belt 28, flywheels 29 and 30 are rotated in the direction of arrow D, and drive gear 23 is rotated in the direction of arrow E. When the drive gear 23 rotates in the direction of arrow E, the second intermediate gear 16 meshes with the teeth 25 of the drive gear 23, and the teeth 13 of the first intermediate gear 12 rotate in the direction of arrow D via the slip mechanism. Then, since the teeth 11 of the idler gear 8 mesh with the teeth 13 of the first intermediate gear 12, both the idler gear 8 and the rotating lever 9 rotate in the direction of arrow E. The teeth 7 of the take-up reel stand 3 and the teeth 1 of the idler gear 8
1 engages with the take-up reel stand 3 and the driving force is at low speed.
is transmitted to FWD regeneration state (see Figure 3). When the drive of the motor 27 is stopped, the original stopped state is restored.

Next, the case of entering the REV (Reverse) playback state will be described. When the motor 27 is driven in the direction of arrow E, the drive gear 23 rotates in the direction of arrow D.
Then, the teeth 15 of the second intermediate gear 16 are connected to the drive gear 2.
3, and the gear 13 of the first intermediate gear 12 rotates in the direction of arrow E via the slip mechanism. The teeth 11 of the idler 8 are the first intermediate gear 12
The idler gear 8 is engaged with the teeth 13 of the idler gear 8.
rotates together with the rotating lever 9 in the direction of arrow E. Then, the teeth 6 of the supply reel stand 2 and the teeth 11 of the idler gear 8 engage, and the driving force is transmitted to the supply reel stand 2 at low speed, resulting in the REV state (see FIG. 4). When the drive of the motor 27 is stopped, the original stopped state is returned.

To enter the FWD fast forward state, first intermediate gear 12
When the switching lever 22 for moving up and down is operated in the direction of the arrow A and the motor 27 is driven in the direction of the arrow E, the transmission is transmitted to the belt 28, the flywheels 29 and 30 rotate in the direction of the arrow E, and the drive gear 23 is driven in the direction of the arrow E. Rotate in direction D. When the drive gear 23 rotates in the direction of the arrow D, the teeth 13 of the first intermediate gear 12 engage with the teeth 26 of the drive gear 23, and the gear rotates in the direction of the arrow E. Then, since the teeth 11 of the idler gear 8 mesh with the teeth 13 of the first intermediate gear 12, the idler gear 8 rotates in the direction of arrow D together with the rotation lever 9. Then, the teeth 6 of the supply reel stand 2 and the teeth 11 of the idler gear 8 engage, and the driving force is transmitted to the supply reel stand 2 at high speed, resulting in a winding state (the fourth
(See Figure 5). When the drive of the motor 27 is stopped, the original stopped state is returned.

To rewind, press the switching lever 22 arrow A
By rotating the motor 27 in the direction of arrow D while the motor 27 is being operated in the direction shown in FIG.

(f) Effects of the invention According to this invention, by moving the idler gear with a single drive device, the rotation mechanism is simplified by selectively driving either the supply reel stand or the take-up reel stand. In addition, the magnetic tape recording device can be miniaturized, and switching operations of playback mode, fast forwarding, and rewinding in a magnetic tape recording device can be easily performed with a small operating force.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the stopped state of the reel drive device of a tape recorder which is an embodiment of this invention, Fig. 2 is a sectional view showing the same REV playback state, and Fig. 3
FIG. 4 is a plan view showing the FWD playback and FWD fast-forward states, FIG. 4 is a plan view showing the REV playback and REV rewind states, and FIG. 5 is a cross-sectional view showing the fast-forward and rewind states. 2... Supply reel stand, 3... Take-up reel stand,
8... Idler gear, 9... Rotating lever, 12,
16...Intermediate gear, 22...Switching lever, 23
... Drive gear, 27, 28, 29, 30... Drive means.

Claims (1)

[Claims for Utility Model Registration] A magnetic tape recording device having a rotation mechanism that selectively rotates a supply reel stand and a take-up reel stand via a transmission means in accordance with the rotational direction of a drive means, A drive gear having small-diameter teeth and rotated by transmission of the rotational driving force of the motor; a rotation lever that rotates around the rotation center of the drive gear; It has a small diameter intermediate gear that can mesh with the diameter tooth portion of the drive gear, a large diameter intermediate gear that moves and rotates in the axial direction together with the small diameter intermediate gear that can mesh with the small diameter tooth portion of the drive gear, and the small diameter intermediate gear that moves and rotates in the axial direction. Intermediate gear means in which the intermediate gear and the large-diameter tooth portion of the drive gear selectively mesh with each other, or the large-diameter intermediate gear and the small-diameter tooth portion of the drive gear selectively mesh, and for moving the small-diameter intermediate gear and the large-diameter intermediate gear in the axial direction. It is provided on the switching lever and the rotating lever, and is always in mesh with the small-diameter intermediate gear, and selectively meshes with the teeth on the supply reel stand and the take-up reel stand as the rotating lever rotates. and a means for operating a rotation lever according to the rotational direction of the motor, and configured to switch the running speed and speed direction of the magnetic tape according to the rotational direction of the motor and the operation of the switching lever. A rotating mechanism for a magnetic tape recording device characterized by: