JPS61145751A - Drive mechanism of reel turntable - Google Patents

Abstract

PURPOSE:To simplify the constitution and also to facilitate the easy distribution of parts with a drive mechanism of the reel turntable, by rotating the 1st rotary shaft with the revolving power of a driving motor with the 2nd rotary shaft revolved in a body with the 1st rotary shaft and securing the selective switch and engagement with a gear having a different revolution transmitting speed by the displaced position of the 2nd rotary shaft. CONSTITUTION:A rotary shaft 42 slides toward an arrow X1 and has a displacement there shown by a solid line, and a worm 43 engages a gear 50 with revolutions. Thus the counterclockwise revolving power of a driving motor 33 is transmitted to a drive gear 54 which engages a gear 51. The gear 51 is decelerated down to a speed ratio against the gear 54 and therefore a reel drive disk gear 57 is driven clockwise at the tape-up side. A record/reproduction mode is set and a tape is taken up a reel 58 at the take-up side. Then a fast forward mode is set to actuate a plunger 48 of a switch mechanism 49. Thus an arm 48a is slided toward an arrow mark Y1. While a lever 46 is turned counterclockwise. Therefore, the worm 43 engages a gear 53 for rapid traverse/ rewind mode. As a result, the revolving power of the motor 33 is transmitted to the gear 54 unified with the gear 53.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a reel stand drive mechanism that transmits the rotational driving force of a drive motor to a reel stand.

2. Description of the Related Art A conventional reel stand drive mechanism for, for example, a video tape recorder, as shown in FIG. Belt 4. Pulley 5. Drive gear6. It is transmitted via gear 71 rotation gear 8, etc.
In the recording/playback mode, the rotating gear 8 supported by the rotating arm 9 rotates in the six directions of arrows and meshes with the gear 10.
0° winding side slip clutch 11. The drive motor that drives the reel gear 13 on the take-up side clockwise via the gear 12, and also drives the flywheel 2 in the reverse play mode, rotates in the opposite direction to the above mode, and the rotary gear 8 rotates in the reverse direction. The rotating arm 9 rotates in the direction of arrow B and meshes with the gear 14. Supply side slip clutch 15. gear 16
The reel gear 17 on the supply side is driven in the counterclockwise direction through the feed side reel gear 17, and in the fast-forward mode, the idler 20, which is pressed against the idler 19 that rotates together with the pulley 5, is driven in the six directions of the arrow separately from the rotary gear 8 by the fast-forward operation. The idlers 19, 20, 21. The reel gear 13 is rotated clockwise at high speed via the gear 12, and in the rewind mode, the idler 20 is rotated in the direction of arrow B by the rewind operation, and the idler 20 on the supply side is rotated in the direction of arrow B.
The idlers 19, 20, 22. The tape was wound by rotating the reel base gear 17 counterclockwise at high speed via the gear 16.

Problems to be Solved by the Invention However, the conventional reel stand drive mechanism with the above configuration has a rotary gear 8. Pulleys 3, 5, . Belt 4. Gear 7, 8.9.10°12.14.16. Since it is equipped with a large number of drive force transmission parts such as slip clutches 11 and 15, its configuration is complex, and each part occupies a large area, making it difficult to respond to miniaturization of the device. Since the belt 4 is interposed, it may slip due to deterioration over time, causing transmission loss to the pulley 5.
The pulley 3 is unreliable in that it may break, and furthermore, since the pulley 3 protrudes from the lower surface of the flywheel 2, it is difficult to reduce the thickness of the pulley 3 by the length of the protrusion.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a reel base SI structure that eliminates the above-mentioned drawbacks.

Means and Effects for Solving the Problems The present invention provides a first rotary shaft that rotates by being transmitted with the rotational force of a drive motor, a second rotary shaft that rotates integrally with the first rotary shaft, and a second rotary shaft that rotates integrally with the first rotary shaft. It is provided so as to be freely displaceable linearly in the axial direction of the first rotating shaft, and the second rotating shaft is slidably displaced according to each mode by a switching mechanism, and the rotation transmission speed is changed depending on the displacement position of the second rotating shaft. By selectively switching and meshing gears with gears having different ratios, the structure is simplified and the driving force is transmitted reliably.

Embodiment FIGS. 1 and 2 show an embodiment of the reel stand drive mechanism according to the present invention. In FIG. 1, 31 is a flywheel of a capstan drive motor 33 that drives a capstan 32, and also serves as a rotor-side magnet of the drive motor 33.

As shown in FIG. 2, the flywheel 31 is attached to the chassis 34.
It is rotatably supported by a bearing 36 facing the lower surface of a coil 35 of a drive motor 33 disposed on the lower surface.

At the center of the flywheel 31 is an annular bevel gear 37.
is formed protrudingly.

Reference numeral 38 denotes an input side rotation shaft (first rotation shaft), which has a bevel gear 39 at its tip that meshes with the bevel gear 37 of the flywheel 31, and rotates along the lower surface of the chassis 34 by a bearing 40. It is freely supported. Further, the rotating shaft 38 extends in the radial direction of the flywheel 31 from between the coils 35 through a gap 41 between the flywheel 31 and the lower surface of the chassis 34 . Note that 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. Furthermore, since the rotating shaft 38 is inserted between the coils 35, the thickness of the drive motor 33 is reduced, and the rotating shaft 38 does not protrude from the lower surface of the flywheel, resulting in a thinner design. 42 is the rotating shaft on the output side (
It has a worm 43 at its tip and is a bearing.

44 and is provided along the lower surface of the chassis 34 so as to be freely rotatable and slidable in the axial direction. Further, the rotating shaft 42 is the third
As shown in Figures (A) and (B), it has a protrusion 42a that protrudes in the radial direction. Further, the rotating shaft 38 has an axial hole 38a into which the rotating shaft 42 is fitted, and a groove 38b formed along the hole 38a into which the protrusion 42a of the rotating shaft 42 is fitted. Therefore, the rotation shaft 42 can rotate integrally with the rotation shaft 38 regardless of the axial displacement position due to the engagement between the protrusion 42a and the groove 38b.

Note that the bearing 40 is, for example, a deep groove ball bearing, and the rotating shaft 38 is press-fitted into an inner ring to restrict the driving of the rotating shaft 38 in the axial direction.

In this way, in order to transmit the rotational driving force of the drive motor 33 from the flywheel 31 via the rotation shaft 38.42,
Fewer parts are required to transmit rotational force, the configuration is simplified, and the area occupied by each part is smaller.

As shown in FIGS. 4A and 4B, a flange 42b protrudes in one radial direction at an intermediate position in the longitudinal direction of the rotating shaft 42, and a connecting member 45 engages with the flange 42b. The connecting member 45 is formed by screwing a plate part 44d to a main body part 45c having an annular recess 45a into which the collar part 42 is fitted and a shaft 45b on the upper side, and is inserted between the plates so as to cover the collar part 42b from both sides. I'm here.

46 is a lever supported on a shaft 47, one end of which is connected to the connecting member 4.
The arm 48a of the plunger 48 is connected to the intermediate portion thereof. Note that the switching machine M449 is connected to the rotating shaft 42. Connecting member 45° lever 46. Plunger 4
8. The operation of the switching mechanism 49 causes the rotary shaft 42 to slide linearly in the directions of arrows X+ and X2, and the worm 43 selectively engages with gears having different rotational transmission speed ratios, as will be described later.

In FIG. 1, reference numeral 50 denotes a gear for recording/reproducing mode, which is supported on the lower surface side of the chassis 34.

The gear 51 is supported coaxially with the gear 5° on the upper surface side of the chassis 34 via a slip clutch 52.

A gear 53 for fast forwarding and rewinding is supported on the lower surface of the chassis 34 and has the same number of teeth and diameter as the gear 51. Therefore, as will be described later, the worm 43 is activated by the plunger 48 to move the arm 48a, the lever 46 . The connecting member 451 is slidably displaced in the directions of arrows X+ and X2 via the rotating shaft 42, and is selectively engaged with the gear 50 or 53.

That is, in the recording/reproducing mode, the rotating shaft 42 slides in the direction of arrow X1, and the worm 43 meshes with the gear 50 for the recording/reproducing mode. Further, in the fast forward 7 rewind mode, the rotating shaft 42 slides in the direction of arrow X2, and the worm 43 meshes with the gear 53 for the fast forward 7 rewind mode.

One of the gears 50 or 53 in each mode is the worm 43
Since the rotational force is selected based on the linear drive displacement, the area occupied by the parts that transmit the rotational force is small and the device can be miniaturized.

Here, the operation of the reel stand drive mechanism according to each mode will be explained.

First, when the recording/reproducing mode is operated, the rotating shaft 42 is displaced to a position (indicated by a solid line) in the direction of the arrow X+force, and the worm 43 meshes with the gear 50 while rotating. Therefore, the counterclockwise rotational force of the drive motor 33 is applied to the bevel gear 37 of the flywheel 31 and the rotating shafts 38, 42 of the flywheel 31.
．． Worm 43, m1Z50. VbeV)kura')chi5
A drive gear 54 meshing with the gear 51 via the 2,1 wheel 51
The speed is reduced to the speed ratio of the gear 51 and the drive gear 54. Therefore, the driving gear 54 is driven clockwise, and via the rotating gear 56 supported by the rotating arm 55, drives the reel base gear 57 on the winding side clockwise at a predetermined rotational speed.

The tape is wound by the take-up reel 58 rotating clockwise at a tape running speed that allows recording/reproduction, and enters the recording/reproduction mode.

Next, when switching to fast forward mode, the switching mechanism 49
The plunger 48 operates to slide the arm 48a in the direction of arrow Y1 and rotate the lever 46 counterclockwise. Therefore, the rotating shaft 42 is connected to the lever 46 via the connecting member 45.
The worm 43 rotates counterclockwise and slides linearly in the direction of the arrow X2, and the worm 43 is selectively engaged with the gear 53 for fast forwarding and rewinding. Therefore, the rotational force of the drive motor 33 is applied to the rotating shafts 38, 42 . Warm 43. The signal is transmitted via gear 53 to drive gear 54 which is integral with gear 53. Also, gear 5
Since 0 and 53 have the same number of teeth, the drive gear 54 is decelerated by the speed ratio of the gear 5° and the drive gear 54 in the recording/reproduction mode, but in the fast forward mode, the drive gear 54 has the same number of teeth as the gear 53. Since it rotates at a rotational speed, it is driven at an increased speed compared to the recording/reproducing mode.

That is, the drive gear 54 drives the reel platform gear 57 clockwise at a high rotational speed via the rotation gear 56. For this reason,
The tape is wound up by the winding side wheel 58 which rotates at high speed and enters the fast forward mode.

Next, when you switch to rewind mode, the flywheel 3
1 and the capstan 32 rotate in a clockwise direction opposite to the recording/reproducing mode and fast forward mode. For this reason, the bevel gear 37.39. Rotating shaft 3B, 42. The worm 43 is rotated in a direction opposite to the above mode, and the gear 53 and drive gear 54 with which the worm 43 meshes are driven counterclockwise.

Note that the rotating gear 56 has one end connected to a protruding part 59 of the chassis 34.
Since the rotary gear 56 is in pressure contact with the cantilevered leaf spring 60 fixed to the lever 55, when the rotary gear 56 is driven counterclockwise, the rotary gear 56 bends the leaf spring 6o while the rotary lever 55
The plate spring 60 is rotated with rotation in the direction of arrow C. In this way, the reverse rotation of the flywheel 31 causes the rotary gear 56 to rotate from a position where it meshes with the reel base gear 57 on the take-up side to a position where it meshes with the reel base gear 61 on the supply side.

Therefore, the reel base gear 61 meshes with the gear 53. of the worm 43. The drive gear 541 is driven counterclockwise at high speed via the rotating gear 56, and the supply reel 62 winds up the tape at high speed as in the fast forward mode.

Next, when switching to the reverse play mode, the plunger 4 of the switching mechanism 49 is in the rewind mode state.
8 is activated to slide and displace the arm 48a in the direction of arrow Y2, and the lever 46 is rotated clockwise. Therefore, the rotating shaft 42 slides linearly in the direction of arrow x1 via the connecting member 45, and the worm 43 is switched to the recording/reproducing gear 50 from the position where it meshes with the fast forwarding 7 rewinding gear 53. Displaced to the meshing position. Therefore, the rotational force of the drive motor 33 is applied to the rotating shafts 38, 42. Worm 43° gear 50. Slip clutch 52. Gear 51. Drive gear 549 Rotating gear 5
6 to the reel base gear 61. That is, the reel stand 62 is driven counterclockwise at a predetermined rotational speed to wind the tape and enter the reverse reproduction mode.

In addition, in the above explanation, a worm is provided on a rotating shaft that slides in the axial direction according to each mode, and the worm is slidably displaced to selectively engage gears with different speed ratios. The transmission means is not limited to a worm; for example, a pair of bevel gears oriented in different axial directions may be provided at the tip of the rotating shaft, and the pair of bevel gears may be slid onto the gears facing the respective pair of bevel gears. It is also possible to selectively engage them together with dynamic displacement.

Effects of the Invention As described above, in the reel stand drive mechanism according to the present invention, the first rotating shaft rotates by being transmitted with the rotational force of the drive motor, and the second rotating shaft rotates integrally with the first rotating shaft. The second rotating shaft is slidably displaceable in the axial direction of the first rotating shaft according to each mode by a switching mechanism, and depending on the displacement position of the second rotating shaft. Because gears with different rotation transmission speed ratios are selectively engaged, the configuration can be simplified without requiring many parts such as belts, pulleys, and gears as in the past, and the arrangement of each part can be simplified. It is easy to use, which is advantageous in terms of design, and since the number of parts is small, the area occupied can be reduced, making it possible to downsize the device.Furthermore, unlike belts, there is no need to worry about deterioration over time, and the rotation of the drive motor is easy. It has features such as being able to reliably transmit force, improving the reliability of transmitting rotational driving force, and being able to accommodate thinning of the device.

[Brief explanation of the drawing]

FIG. 1 is a plan view for explaining one embodiment of the reel stand drive mechanism according to the present invention, FIG. 2 is a view seen from two arrow directions in FIG. 1, and FIG. 3(B) is a cross-sectional view for explaining the state in which the second rotating shaft is fitted into the first rotating shaft, and FIG. FIG. 4(A) is a sectional view for explaining the connecting member that engages with the flange of the second rotating shaft, and FIG. 4(B) is a sectional view of the connecting member shown in FIG. 4(A) from the axial direction. The view shown in FIG. 5 is a plan view for explaining a conventional reel stand drive mechanism. 31... Flywheel, 32... Capstan,
33... Drive motor, 35... Coil, 37.39
...Bevel gear, 38.42... Rotating shaft, 43...
Worm, 45... Connection member, 46... Lever, 4
8...Plunger, 48a...Arm, 49...
Switching mechanism, 52... Slip clutch, 54... Drive gear, 55... Rotating arm, 56... Rotating gear, 5
7.61... Reel base gear, 58... Take-up side reel, 62... Supply side reel.

Claims (1)

[Claims] A first rotating shaft that rotates by being transmitted with the rotational force of the drive motor, and a first rotating shaft that rotates integrally with the first rotating shaft and is displaceable linearly in the axial direction of the first rotating shaft. 2 rotating shaft and slidingly displacing the second rotating shaft according to each mode,
A reel stand drive mechanism comprising a switching mechanism that selectively engages gears having different rotation transmission speed ratios depending on the displacement position of the second rotating shaft.