JPH0450585Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention relates to a reel stand rotation drive mechanism of a magnetic tape recording device such as a tape recorder or a video tape recorder, and is particularly applicable to a take-up reel stand and a supply reel stand at low speeds. -Related to improvements in gear mechanisms that rotate at high speeds.

(b) Prior Art Conventionally, as a reel stand rotation drive mechanism of a magnetic tape recording device, a drive gear is movably provided between a take-up reel stand and a supply reel stand.
During playback and fast forwarding, the drive gear is directly engaged with the take-up reel stand, and during REV playback and rewinding, the drive gear is engaged with the supply reel stand via an idler gear to rotate the supply reel stand in the opposite direction to the above. let me,
Further, 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 and winding, the tape is fed at high speed.

(c) Problems to be solved by the invention However, the above configuration requires a mechanism for moving the drive gear and a slip gear in addition to the drive gear, making the structure complicated, and furthermore, due to the complexity, it is difficult to downsize. It was difficult to do so.

This idea was made in view of the above circumstances, and it is possible to downsize, and the FWD during playback.
The present invention aims to provide a reel stand rotation drive mechanism for a magnetic tape recording device that can reduce the operating force required for REV switching operations, fast forwarding, and rewinding operations.

(d) Means and operation for solving the problem The configuration of this invention consists of a first gear in which a large-diameter internal gear part and a small-diameter internal gear part are provided with an interval between them;
a drive means for rotationally driving the gear; first and second reel stands having a spur gear at one end; a first lever rotating about the rotation axis of the first gear;
A second lever that moves the lever in the direction of the rotation axis of the first gear.
A lever, a cylindrical shape that is rotatably provided on a rotating shaft that stands upright at the end of the first lever, and a small-diameter tooth section that is provided on the entire outer peripheral surface in the longitudinal direction, and the small-diameter tooth section and the diameter are different. a second gear having a large-diameter tooth portion provided on a portion of the outer circumferential surface in the longitudinal direction;
When the first gear is rotated, the first lever is rotated, and the spur gear of the first or second reel base and the small diameter teeth of the second gear are selectively rotated depending on the direction in which the first gear is rotated. At the same time, the large-diameter teeth of the second gear and the large-diameter internal teeth of the first gear mesh to rotate the first or second reel stand at a low speed, and the second lever When the first gear is moved in the direction of the rotation axis by the lever, the spur gear of the first or second reel base and the small diameter teeth of the second gear mesh, and the large diameter teeth of the second gear mesh with each other. This is a reel stand rotation drive mechanism for a magnetic tape recording device, characterized in that a small-diameter internal toothed portion of a first gear meshes with the reel stand to rotate the first or second reel stand at high speed.

(E) Example The example of this invention will be described in detail with drawings below.
This invention is not limited to the following examples.

In Figures 1 to 5, 1 is the main body chassis;
A first reel stand (hereinafter referred to as a take-up reel stand) 2 and a second reel stand (hereinafter referred to as a supply reel stand) 3 are rotatably supported at a distance from each other. 4 and 5 are the axes of the take-up reel stand 2 and the supply reel stand 3, respectively. Spur gears 6 and 7 are integrally formed at one end of each of the take-up reel stand 2 and the supply reel stand 3. A second gear 8 (hereinafter referred to as an idler gear) is rotatably attached to a rotating shaft 10 erected at the end of the first lever 9 . The idler gear 8 has a cylindrical shape, and is provided with small-diameter teeth 11 on its entire outer circumferential surface in the longitudinal direction. Large-diameter tooth portions 12 having different diameters are provided, leaving a small-diameter tooth portion 11a at the end. The first lever 9 has a large-diameter internal toothed portion 13.
A rotating shaft 1 of a first gear (hereinafter referred to as a driving gear) 15 in which a small-diameter internal gear 14 and a small-diameter internal gear 14 are provided with an interval between them.
It is provided so that it can rotate around 6. The rotating shaft 16 is provided upright on the main body chassis 1. The drive gear 15 is formed in the shape of an inverted dish, and the large-diameter internal toothed part 13 and the small-diameter internal toothed part 14 are formed on the inner surface of its peripheral edge, and furthermore, a rotating shaft 16 is inserted into the center thereof. A boss 17 is formed. A spring 18 is provided between the boss 17 and the first lever 9, and the first lever 9 is biased toward the main body chassis 1 by the spring 18. First lever 9
A second lever (hereinafter referred to as a switching lever) 19 having an inclined surface 19a near the end thereof is interposed between the main body chassis 1 and the main body chassis 1. Furthermore, a groove 20 is provided on the outer surface of the peripheral edge of the drive gear 15 . A belt 24 is applied to the groove 20 from a motor 21 via flywheels 22 and 23. The motor 21, flywheels 22, 23, and belt 24 constitute a driving means 25.

Next, the operation of the embodiment will be explained.

The state shown in FIG. 2 shows a non-operational state in which the motor 21 is not rotating, that is, the drive gear 15 is stopped.

To change from the stop state mentioned above to the FWD regeneration state,
When the motors 21 are rotated in the directions of the arrows C shown in the figure, the rotation is transmitted to the rotating belts 24, and the flywheels 22 and 23 are rotated in the directions of the arrows C, and the drive gear 15 is rotated in the D direction. As a result, the large-diameter tooth portion 12 of the idler gear 8 meshes with the large-diameter internal tooth portion 13 of the drive gear 15.
The idler gear 8 rotates in the direction of arrow D together with the first lever 9. Then, the spur gear 6 of the take-up reel stand 2 and the small diameter teeth 11 of the idler gear 8 mesh, and the driving force of the motor 21 is transmitted to the take-up reel stand 2.
The take-up reel stand 2 is rotated at low speed. This state is shown in FIG. In other words, it enters the FWD regeneration state.
If the rotation of the motor 21 is stopped here, the original stopped state is returned.

Next, in order to enter the REV playback state, motor 21
When rotated in the direction of arrow D, the rotation is transmitted to the belt 24, the flywheels 22 and 23 rotate in the direction of arrow D, and the drive gear 15 rotates in the direction of arrow C. As a result, the large diameter tooth portion 1 of the idler gear 8
2 meshes with the large-diameter internal toothed portion 13 of the drive gear 15, the idler gear 8 rotates in the direction of arrow C together with the first lever 9. Then, the spur gear 7 of the supply reel stand 3 and the small diameter tooth portion 11 of the idler gear 8 mesh with each other, the driving force of the motor 21 is transmitted to the supply reel stand 3, and the supply reel stand 3 is rotated at a low speed.
The REV playback state shown in FIG. 4 is entered. Similar to the EWD regeneration state described above, if the rotation of the motor 21 is stopped here, the original stopped state is returned.

To enter the fast forward state, operate the switching lever 19 for moving the idler gear 8 up and down in the direction of arrow A, and rotate the motor 21 in the direction of arrow C. Transmission is transmitted to the rotating belt 24, and the flywheel 2
2, 23 rotates in the direction of arrow C, and the drive gear 15 rotates in the direction of arrow D.
Rotate in the direction. By operating the switching lever 19, the small-diameter tooth portion 11a of the idler gear 8 meshes with the small-diameter internal tooth portion 14 of the drive gear 15. Then, the idler gear 8 is moved along with the first lever 9 by the arrow D
Rotate in the direction. Then, the spur gear 6 of the take-up reel stand 2 and the small-diameter tooth portion 11 of the idler gear 8 mesh, and the driving force is transmitted to the take-up reel stand 2, causing the take-up reel stand 2 to rotate at high speed, as shown in FIG. Then, the state becomes the fast-forward state shown in FIG. When the drive of the motor 21 is stopped, the original stopped state is returned.

Next, to enter the winding state, operate the switching lever 19 for moving the idler gear 8 up and down in the direction A and drive the motor 21 in the direction of arrow D. The rotation is transmitted to the belt 24 and the flywheel 2
2 and 23 rotate in the direction of arrow D, and the drive gear 15 rotates in the direction of arrow C. Then, by operating the switching lever 19, the teeth 11 of the idler gear 8
a meshes with the internal toothed portion 14 of the drive gear 15. Then, the idler gear 8 rotates in the direction of arrow C together with the first lever 9 that stands up. Then, the spur gear 7 of the supply reel stand 3 and the small-diameter tooth portion 11 of the idler gear 8 mesh with each other, and the driving force is transmitted to the supply reel stand 3, rotating the supply reel stand 3 at high speed. Make it into the winding state shown in the figure. When the drive of the motor 21 is stopped, the original stopped state is returned.

(f) Effects of the invention According to this invention, there is no need for a slip gear as in the past, and the rotation of the idler gear can be selectively transmitted to both reel stands using a single drive means, resulting in a more compact device. Since the idler gear can be moved up and down, for example, when applied to drive the reel stand of a tape recorder, during playback,
Also, it has excellent effects such as being able to easily switch between fast forwarding and winding.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the embodiment of this invention in the FWD/REV regeneration state, Fig. 2 is a plan view in the stopped state, Fig. 3 is a plan view in the FWD/REV regeneration state, and Fig. 4 is a plan view in the FWD/REV regeneration state. Similarly, FIG. 5 is a plan view in the REV playback/winding state, and a vertical cross-sectional view in the fast forward/winding state. 2...First reel stand, 3...Second reel stand,
6, 7... Spur gear, 8... Second gear, 9... First gear
Lever, 10...Rotary shaft, 11...Small diameter teeth,
12...Large diameter tooth part, 13...Large diameter internal tooth part, 1
4...Small diameter internal gear part, 15...First gear, 25...
...driving means.

Claims (1)

[Scope of utility model registration request] a first gear in which a large-diameter internal toothed portion and a small-diameter internal toothed portion are provided with an interval between them; a driving means for rotationally driving the first gear; and first and second gears each having a spur gear at one end. A reel stand, a first lever that rotates around the rotation axis of the first gear, a second lever that moves the first lever in the direction of the rotation axis of the first gear, and a second lever that is erected at an end of the first lever. A cylindrical shape that is rotatably provided on a rotating shaft, and a small-diameter tooth section provided on the entire outer circumferential surface in the longitudinal direction, and a large-diameter tooth section that is different in diameter from the small-diameter tooth section and provided on a part of the longitudinal direction of the outer circumferential surface. and a second gear having teeth, and when the first gear is rotated, the first lever is rotated, and the first or second lever is selectively rotated depending on the direction in which the first gear is rotated.
The spur gear of the reel base and the small-diameter tooth of the second gear mesh, and the large-diameter tooth of the second gear meshes with the large-diameter internal tooth of the first gear, thereby reeling the first or second reel. When the base is rotated at a low speed and the second lever is moved in the direction of the rotation axis of the first gear by the first lever, the spur gear of the first or second reel base and the small diameter tooth of the second gear A magnetic tape recording device characterized in that the large-diameter teeth of the second gear mesh with the small-diameter internal teeth of the first gear to rotate the first or second reel stand at high speed. Reel stand rotation drive mechanism.