JPH0610899B2 - Reel drive mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel base drive mechanism that transmits rotational drive of a drive motor and force to a reel base.

2. Description of the Related Art As shown in FIG. 5, a conventional reel stand drive mechanism of a video tape recorder, for example, uses a rotary driving force of a drive motor for driving a capstan 1 and a flywheel 2 as a pulley 3 on a lower surface side of a flywheel 3 and a belt. 4, the pulley 5, the drive gear 6, the gear 7, the rotary gear 8 and the like are transmitted,
In the recording / reproducing mode, the rotating gear 8 supported by the rotating arm 9 rotates in the direction of the arrow A and meshes with the gear 10, so that the gear 1
0, the reel side gear 13 on the take-up side is driven in the clockwise direction via the slip clutch 11 on the take-up side, and the gear 12, and the drive motor for driving the flywheel 2 in the reverse reproduction mode is opposite to the above mode. Direction, the rotating gear 8 rotates together with the rotating arm 9 in the direction of the arrow 8 and meshes with the gear 14, the gear 14, the supply side sliding clutch 15, and the gear 16
Drive the reel base gear 17 on the supply side in the counterclockwise direction, and in the fast-forward mode, the idler 20 pressed against the idler 19 rotating with the pulley 5 is fast-forwarded to move in the direction of arrow A separately from the rotating gear 8. When the idler 21 on the winding side is pressed against the idler 21, the reel base gear 13 is rotated at a high speed in the clockwise direction through the idlers 19, 20, 21, and the gear 12, and in the rewinding mode, the idler 20 is rewound by the rewinding operation. Rotates in the direction of arrow B and comes into pressure contact with the idler 22 on the supply side, and the reel base gear 17 is rotated counterclockwise at high speed via the idlers 19, 20, 22, and the gear 16 to wind the tape. Was there.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the conventional reel stand drive mechanism having the above-described configuration, the flywheel 2 and the reel stand gear are switched so that the speed ratio corresponding to each mode is switched by the turning displacement of the turning gear 8 and the idler 20. Since a large number of driving force transmitting parts such as pulleys 3, 5, belts 4, gears 7, 8, 9, 10, 12, 14, 16 and sliding clutches 11, 15 are provided between 13 and 17, its structure Is complicated, and the area occupied by each component is large, so it is not possible to reduce the size of the device. Further, since the belt 4 is interposed in the middle of transmission, it slips due to deterioration over time and transmission loss occurs to the pulley 5. Further, there is a drawback in that the belt 4 is cut and the reliability is low, and the pulley 3 projects from the lower surface of the flywheel 2 so that the projecting dimension cannot be reduced.

Therefore, it is an object of the present invention to provide a reel base drive mechanism that eliminates the above drawbacks.

Means and Actions for Solving the Problems The present invention is directed to a first rotating shaft that is rotated by transmitting a rotational force of a drive motor, and the first rotating shaft, and the first rotating shaft rotates integrally with the first rotating shaft. A second rotary shaft that is linearly displaceable in the axial direction of the rotary shaft of the
The rotation transmission in which the rotating shaft of the second rotating shaft is slidably displaced according to each mode, and a gear that rotates integrally with the second rotating shaft according to the displacement position of the second rotating shaft is arranged substantially horizontally on the chassis surface. Selectively mesh with one gear with different speed ratio,
The structure is simplified and the driving force is surely transmitted.

Embodiment FIG. 1 and FIG. 2 show an embodiment of a reel base drive mechanism according to the present invention. In FIG. 1, 31 is a flywheel of a capstan drive motor 33 for driving the capstan 32, which also serves as a rotor side magnet of the drive motor 33. As shown in FIG. 2, the flywheel 31 is rotatably supported by a bearing 36 so as to face the lower surface of the coil 35 of the drive motor 33 disposed on the lower surface of the chassis 34.

An annular bevel gear 37 is provided at the center of the flywheel 31.
Are formed to project.

Reference numeral 38 denotes an input-side rotating shaft (first rotating shaft), which has a bevel gear 39 that meshes with a bevel gear 37 of the flywheel 31 at its tip end, and is rotated by a bearing 40 along the lower surface of the chassis 34. It is supported freely. Further, the rotary shaft 38 extends in the radial direction of the flywheel 31 through the gap 41 between the flywheel 31 and the lower surface of the chassis 34 from between the coils 35. The flywheel 31 is configured such that the rotating shaft 38 is inserted between the flywheel 31 and the lower surface of the chassis 34. Further, since the rotary shaft 38 is inserted between the coils 35, the thickness dimension of the drive motor 33 is small, and the rotary shaft 38 does not protrude from the lower surface of the flywheel, and is made thinner accordingly. Reference numeral 42 denotes an output-side rotary shaft (second rotary shaft), which has a worm 43 at its tip, and is provided along the lower surface of the chassis 34 so as to be rotatable and axially slidable on the bearing 44. ing. Also, the rotating shaft 4
As shown in FIGS. 3 (A) and 3 (B), 2 has a protruding portion 42a protruding in the radial direction. Further, the rotary shaft 38 has a hole 38a in the axial direction into which the rotary shaft 42 is fitted, and the rotary shaft 4
It has a groove 38b formed along the hole 38a so that the second protrusion 42a is fitted therein. Therefore, the rotating shaft 4
2 can rotate integrally with the rotary shaft 38 regardless of the axial displacement position due to the engagement between the protrusion 42a and the groove 38b.

The bearing 40 is, for example, a deep groove ball bearing, and the rotary shaft 38 is press-fitted into the inner ring to regulate the sliding of the rotary shaft 38 in the axial direction.

In this way, since the rotational driving force of the drive motor 33 is transmitted from the flywheel 31 via the rotary shafts 38 and 42,
The number of parts for transmitting the rotational force is small, the configuration is simplified, and the area occupied by each part is small.

As shown in FIGS. 4 (A) and 4 (B), a collar portion 42b projects in the radial direction at an intermediate position in the longitudinal direction of the rotary shaft 42,
The connecting member 45 is engaged with the collar portion 42b. The connecting member 45 is formed by screwing a plate portion 45d to a main body portion 45c having an annular recess 45a into which the collar portion 42b is fitted and a shaft 45b on the upper side, and is inserted so as to cover the collar portion 42b from both sides. I'm out.

46 is a lever supported by a shaft 47, one end of which is a connecting member 4
The arm 48a of the plunger 48 is connected to the intermediate portion by engaging with the shaft 45b of the No. 5 shaft. The switching mechanism 49 includes a rotary shaft 42, a connecting member 45, a lever 46, and a plunger 48.
It is composed by. By the operation of the switching mechanism 49, the rotary shaft 42 is linearly slid in the directions of the arrows X ₁ and X ₂ ,
The worm 43 selectively meshes with gears having different rotation transmission speed ratios as described later.

Reference numeral 50 shown in FIG. 1 denotes a gear for recording / reproducing mode, which is supported on the lower surface side of the chassis 34. The gear 51 is coaxial with the gear 50 via the sliding clutch 52.
It is supported on the upper surface side of No. 4.

Reference numeral 53 denotes a fast-forward / rewind gear, which is supported on the lower surface of the chassis 34 and has the same number of teeth and the same diameter as the gear 51. Therefore, the worm 43 is slidably displaced in the directions of the arrows X ₁ and X ₂ via the arm 48 a, the lever 46, the connecting member 45, and the rotating shaft 42 by the operation of the plunger 48, as will be described later, and then the worm 43 is moved to the gear 50 or 53. Selectively engages with switching.
That is, in the recording / reproducing mode, the rotary shaft 42 slides in the direction of arrow X ₁ , and the worm 43 meshes with the gear 50 for the recording / reproducing mode. Moreover, fast-forward / rewind rotating shaft 42 slides in the arrow X ₂ direction in mode, the worm 43 is meshed with the gear 53 for forward / rewind mode.

One of the gears 50 or 53 in each mode is the worm 43
Since it is selected by the linear sliding displacement, the area occupied by the components for transmitting the rotational force is small and the device can be downsized.

Here, the operation of the reel base drive mechanism according to each mode will be described.

First, when the recording / reproducing mode is operated, the rotary shaft 42 is displaced to the position (shown by the solid line) slid in the direction of the arrow X ₁ , and the worm 43 rotates and meshes with the gear 50. Therefore, the clockwise rotational force of the drive motor 33 is the bevel gears 37 and 39 of the flywheel 31, the rotary shafts 38 and 42, the worm 43, the gear 50, the sliding clutch 52, and the gear 51.
Is transmitted to the drive gear 54 that meshes with the gear 51 via
The speed is reduced to the speed ratio of the gear 51 and the drive gear 54. Therefore, the drive gear 54 is driven in the clockwise direction, and the reel base gear 57 on the winding side is driven in the clockwise direction at a predetermined rotation speed via the rotation gear 56 supported by the rotation arm 55.

The tape can be recorded / reproduced by the take-up reel 58 that rotates clockwise, and the tape is wound at a running speed to enter the recording / reproduction mode.

Next, when the operation is switched to the fast-forward mode, the switching mechanism 49
The plunger 48 operates to slide the arm 48a in the direction of the arrow Y ₁ and rotate the lever 46 counterclockwise. Therefore, the rotary shaft 42 linearly slides in the arrow X ₂ direction with the counterclockwise rotation of the lever 46 via the connecting member 45, and the worm 43 is switchably meshed with the gear 53 for fast forward / rewind. . Therefore, the rotational force of the drive motor 33 is transmitted to the drive gear 54 integrated with the gear 53 via the rotary shafts 38, 42, the worm 43, and the gear 53. Also, the gear 5
Since 0 and 53 have the same number of teeth, respectively, the drive gear 54 is decelerated at the speed ratio of the gear 50 and the drive gear 54 in the recording / reproducing mode, but the drive gear 54 rotates the same as the gear 53 in the fast-forward mode. Since it rotates at a speed, it is driven at a higher speed than in the recording / reproducing mode.

That is, the drive gear 54 drives the reel base gear 57 in the clockwise direction at a high rotation speed via the rotation gear 56. For this reason,
The tape is taken up by the take-up reel 58 that rotates at high speed, and the fast-forward mode is set.

Next, when the operation is switched to the rewind mode, the flywheel 3
1 and the capstan 32 rotate in the counterclockwise direction opposite to the recording / reproducing mode and the fast-forward mode. For this reason,
Bevel gears 37, 39, rotating shafts 38, 42, worm 43
Is driven to rotate in the opposite direction to the above mode, and the gear 53 and the drive gear 54 with which the worm 43 meshes are driven counterclockwise.

One side of the rotating gear 56 is the protruding portion 59 of the chassis 34.
Since it is pressed against the cantilevered plate spring 60 that is fixedly attached to the rotary lever 55, when the rotary gear 56 is driven in the clockwise direction, the rotary gear 56 bends the plate spring 60 and the arrow of the rotary lever 55 moves. The leaf spring 60 rolls along with the rotation in the C direction. In this way, the reverse rotation of the flywheel 31 causes the rotating gear 56 to rotate from the position where it meshes with the reel base gear 57 on the winding side to the position where it meshes with the reel base gear 61 on the supply side.

Therefore, the reel base gear 61 is driven counterclockwise by high-speed rotation through the gear 53, the drive gear 54, and the rotating gear 56 that mesh with the worm 43, and the supply-side reel 62 operates at high speed in the same manner as in the fast-forward mode. Roll up and wind.

Next, when the operation is switched to the reverse reproduction mode, the plunger 4 of the switching mechanism 49 is operated in the rewind mode.
8 is slidably displaced by actuation of the arm 48a in the arrow Y ₂ direction, the lever 46 rotates clockwise. Therefore, the rotary shaft 42 slides linearly in the direction of the arrow X ₁ via the connecting member 45, and the worm 43 switches from the position meshing with the fast-forward / rewind gear 53 to the recording / reproducing gear 50. Displaces to the meshing position. Therefore, the rotational force of the drive motor 33 is the rotational shafts 38, 42, the worm 43, the gear 50, the sliding clutch 52, the gear 51, the drive gear 54, and the rotary gear 5.
It is transmitted to the reel base gear 61 via 6. That is, the reel base 62 is driven counterclockwise at a predetermined rotation speed to wind up the tape and enter the reverse reproduction mode.

In the above description, a worm is provided on the rotating shaft that slides in the axial direction according to each mode, and the worm is slidably displaced to selectively switch mesh with gears having different speed ratios. , The communication means is not limited to the worm,
For example, a pair of bevel gears oriented in different axial directions are provided at the tip of the rotary shaft, and the pair of bevel gears are selectively meshed with the gears facing the pair of bevel gears together with the sliding displacement of the rotary shaft. You can

EFFECTS OF THE INVENTION As described above, in the reel base drive mechanism according to the present invention, the first rotary shaft rotates by transmitting the rotational force of the drive motor, and the second rotary shaft rotates integrally with the first rotary shaft. It is provided so as to be linearly displaceable in the axial direction of the first rotating shaft, and the switching mechanism causes the second rotating shaft to be slidably displaced in accordance with each mode. Since the gears having different rotation transmission speed ratios are selectively meshed with each other, it is possible to simplify the structure without requiring a large number of parts such as belts, pulleys and gears as in the conventional case. It is easy to dispose, which is advantageous in design, and because it requires only a small number of parts, it can be used for a smaller device by reducing the area occupied by it, and there is no fear of deterioration over time like a belt. Can reliably transmit the rotational force of the It has the features of being able to improve reliability and being able to support thinner devices.

[Brief description of drawings]

FIG. 1 is a plan view for explaining an embodiment of a reel base drive mechanism according to the present invention, FIG. 2 is a view seen from the direction of arrow Z in FIG. 1, and FIG. Sectional drawing for demonstrating the state which the 2nd rotating shaft has fitted in the 1 rotating shaft, FIG. 3 (B) is sectional drawing which follows the IIIB-IIIB line in FIG. 3 (A),
FIG. 4 (A) is a cross-sectional view for explaining the connecting member that engages with the flange portion of the second rotating shaft, and FIG. 4 (B) is FIG. 4 (A).
FIG. 5 is a view of the connecting member shown in FIG. 6 in the axial direction, and FIG. 5 is a plan view for explaining a conventional reel base driving mechanism. 31 ... flywheel, 32 ... capstan, 33
...... Drive motor, 35 ...... Coil, 37,39 ...... Bevel gear, 38,42 ...... Rotary shaft, 43 ...... Worm, 45
...... Connecting member, 46 ...... Lever, 48 ...... Plunger,
48a ... arm, 49 ... switching mechanism, 52 ... slip clutch, 54 ... driving gear, 55 ... rotating arm, 5
6 ... Rotating gear, 57, 61 ... Reel base gear, 58 ...
... Take-up reel, 62 ... Supply reel.

Claims (1)

[Claims] Claim: What is claimed is: 1. A first rotating shaft, which is rotated by transmitting the rotational force of a drive motor, rotates integrally with the first rotating shaft, and is linearly displaced in the axial direction of the first rotating shaft. A second rotation shaft that is freely provided is provided substantially parallel to the chassis surface.
The rotation transmission in which the rotating shaft of the second rotating shaft is slidably displaced according to each mode, and a gear that rotates integrally with the second rotating shaft according to the displacement position of the second rotating shaft is arranged substantially horizontally on the chassis surface. A reel stand drive mechanism characterized in that one of gears having different speed ratios is selectively meshed for switching.