JPS60223049A - Driver - Google Patents

Abstract

PURPOSE:To give the displacement to a displacement member in an extremely short time in response to the revolution of a motor, by securing such constitution where a slider having contact with a displacement member has a direct linear action with the revolution of a worm gear. CONSTITUTION:A worm gear 5 is rotated toward an arrow head E while a fit projection 33 of a slider 28 is pressed to the right end face of a top of the gear 5. Then the projection 33 is shifted quickly to the left side along a groove of the gear 5. During the shift of the projection 33 a hook projection 35 of the slider 28 presses a side projection 34 of a lever 2 to turn the lever 2. Thus the engagement is released between a pin 20 of the lever 2 and a cut 21 of a cam plate 11. Thus a cam plate 13 is moved left by a spring 22, and a brake member 23 is pressed to a reel drive disk 4 by the function of a spring 25. Thus the disk 4 can be controlled in an extremely short time.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] ``'' This invention relates to a drive device for displacing a displaceable member displaceably provided using the rotation of a motor, and particularly relates to a drive device for displacing a displaceable member provided so as to be displaceable, using the rotation of a motor, and particularly for magnetic recording/reproducing i! The present invention relates to a drive device configured to brake the rotation of a reel stand in a machine.

[Prior Art] FIGS. 1 to 4 are diagrams showing a conventional drive device. That is, FIG. 1 is a plan view showing a conventional drive device configured to brake the rotation of a reel stand of a magnetic recording and reproducing device, and the illustrated state is a stopped state (referred to as a stop mode) or a reel stand. Rotation of the table is prohibited. FIG. 2 is a schematic diagram of the gear portion in FIG. 1 viewed from the side. Fig. 3 shows a transition from the stop mode shown in Fig. 1 to a fast forward/rewind state (referred to as FF-REW mode). Fig. 4 shows a state in which the brake is applied in the FF/REW mode shown in Fig. Indicates the condition.

Mainly referring to FIG. 1, a drive device 1 is for displacing a displaceable member, that is, a lever 2, using rotation of a motor 3. As shown in FIG. The rotation of the reel stand 4 is braked in accordance with the displacement of the lever 2.

This will be explained in detail below.

The drive motor 3 operates links in each mode, and performs functions such as pressing a tape guide and a pinch roller for mounting a magnetic tape on a drum. Since these functions are not related to the gist of the present invention, their explanation will be omitted. A worm 5 is fixed to the shaft of the drive motor 3.
rotation is transmitted to the wormwheel 6 and the gear train 7.8.9. A cam groove 10 is formed on the gear 8, and a cam plate 11 is provided in association with the cam groove 10.

The cam plate 11 is slidable only in the left and right directions in the figure. On this cam plate 11, there is a cam groove 10 of the gear 8.
A bin 12 is provided which is adapted to mate with. Therefore, the cam plate 11 moves in the left-right direction according to the rotation of the gear 8.

In relation to the cam plate 11, a cam plate 13 is provided so as to be slidable in the left-right direction in the figure. 1 and 2, a gear 15 is provided on the cam plate 13 via a shaft 14, and a gear 16 that meshes with the gear 15 is provided via a shaft 17. (The lever 2 is provided coaxially with the gear 16. That is, the lever 2 is fitted onto a shaft 17 and can rotate around this shaft 17.

As is clear from Fig. 2, lever 2 and gear 16
are coupled by a spring clutch 18 to achieve the following operations: That is, the gear 16 is
When the gear 16 rotates clockwise in the figure, the lever 2 also rotates in the same direction due to the biting action of the spring clutch 18, but when the gear 16 rotates counterclockwise, the action of the spring clutch 18 loosens, so that the lever 2 rotates in the same direction.
is prevented from rotating.

A spring 19 is connected to one end of the lever 2, and the lever 2 is always urged to rotate counterclockwise. Further, a bin 20 is provided at the other end of the lever 2. In connection with this bin 20, the cam plate 11 is formed with a notch 21 which is adapted to engage with this bin 20. As a result, if the cam plate 11 moves to the right from the state shown in FIG. 13 will also move to the right. In addition, cam plate 1
3 is connected to a spring 22, and the presence of this spring 22 always urges the cam plate 13 to move to the left.

The reel stand 4 serves to wind up the magnetic tape in the magnetic recording and reproducing apparatus. A brake member 23 is provided in association with this reel stand 4. Brake member 2
3 is provided so as to be rotatable about a fulcrum 24, and is biased by a rough spring 25 so as to always rotate in a direction that presses the reel stand 4. Further, as shown in the figure, the rear end portion 23a of the brake member 23 is positioned within a notch 26 formed in the cam plate 13. In addition, as the reel stand 4, the supply side and the winding II! There are two types of L, but only one is illustrated here to simplify the explanation.

From the stop mode shown in Fig. 1 to the FF-R shown in Fig. 3
To shift to the EW mode, press an operation button that is not shown. Then, the shaft of the drive motor 3 first moves to the third
The worm 5 rotates in the direction indicated by arrow A in the figure, and the worm 5 also rotates in the same direction accordingly. This rotation of the worm 5 is transmitted to the worm wheel 6 and the gear train 7, 8.9.

When the gear 8 rotates, the cam plate 11 having the pin 12 that fits into the cam groove 10 moves to the right. As the cam plate 11 moves to the right, the cam plate 13 having the pins 20 that engage with the notches 21 of the cam plate 11 also moves to the right. Then, the notch 26 of the cam plate 13 comes into contact with the rear end 23a of the brake member 23, and the brake member 2
3 in the counterclockwise direction in the figure. As a result, the braking action of the brake member 23 is released, and the reel stand 4
can now rotate freely. In this manner, in the FF-REW mode shown in FIG. 3, fast forwarding and rewinding operations can be performed.

Note that in the FF-REW mode, a mode discrimination switch (not shown) is activated to stop the drive motor 3, but at this time the worm wheel 6 and the gear 15 are in a meshing position. Therefore, gear 1
5 rotates in the direction shown by arrow B in FIG.
It doesn't get across.

Next, in order to instantly stop the rotation of the reel stand 4 in the FF-RhiW mode, a stop switch (not shown) is pressed. Then, the shaft of the drive motor 3 is connected in the opposite direction, that is, in the fourth direction.
Rotate in the direction shown by arrow C in the figure, and -C accordingly.
The worm 5, the worm wheel 6, the gear 15, and the gear 16 each move in the direction l shown by the arrow in the detailed drawing 14.
\Rotate. In this case, since the rotation of the gear 16 is transmitted to the lever 2 by the spring clutch 18, the lever 2 also rotates clockwise in the figure. As a result, t<-2
The engagement between the bin 20 that was standing upright and the notch 21 of the cam plate 11 is removed. Then, the cam plate 13 slides to the left in the drawing by the action of the spring 22 and returns to the stopped position shown in FIG.

Therefore, the restraint on the brake member 23 by the notch 26 of the cam plate 13 is released, and the brake member 23 is released from the spring 2.
5 rotates clockwise and comes into pressure contact with the reel stand 4. In this way, the reel stand 4 is suddenly braked.

The cam plate 11 is returned to the stopped state shown in FIG. 1 by the action of the cam groove 10 and the pin 12. In this way, the pin 20 of the lever 2 and the notch 21 of the cam plate 11 are engaged again as shown in FIG.

Although the conventional drive device 1 is configured as described above, it has the following drawbacks. In other words, the worm wheel 6 performs the operation to instantly release the brake.
However, since the rotation speed of worm 5 and worm wheel 6 is decelerated by the number of teeth, and the operation time of several teeth is required, it takes a while from turning on the stop switch until the brake is applied. It takes a long time.

[Summary of the Invention] Therefore, an object of the present invention is to provide a drive device configured to shorten this operating time as much as possible.

The present invention is a drive device for displacing a displacing member displaceably provided using rotation of a motor, and includes a worm, a slider, a guide member, and a spring.

The worm is connected to the shaft of the motor. The slider is provided so as to be able to come into contact with the displacement member and to be slidable in the axial direction of the arm. Furthermore, this suriko is 1;
- It has a fitting protrusion that fits into the groove of the arm. The guide member guides the slider so that its fitting protrusion does not come out of the groove of the worm. The spring biases the slider so that it always returns to a position approximately at the center of its sliding range.

An embodiment of the present invention will be described below with reference to FIGS. 5 to 7.

[Embodiment of the Invention] FIG. 5 is a plan view showing an embodiment of the present invention configured to brake the rotation of the reel stand of a magnetic recording and reproducing device, and the illustrated state is a stopped state (sliding state). ] - Tsubu mode)
It is. FIG. 6 is a perspective view showing an embodiment of the present invention. FIG. 7 is a plan view showing an embodiment of the present invention, and sequentially shows its operation. Note that the same numbers used in FIGS. 1 to 4 indicate the same or corresponding parts in FIGS. 5 to 7, and therefore the explanation thereof will be omitted.

The drive device 27 is for displacing the displaceable member, that is, the lever 2, using the rotation of the motor 3. This drive device 27 traps the worm 5 connected to the shaft of the motor 3, the slider 28, the guide member 29, and the spring 30. As shown in FIG. 6, the worm 5 preferably forms a cylindrical portion whose both ends have the same diameter as the trough.

The slider 28 is a guide member 29 fixed to the cam plate 13.
The worm 5 is slidably supported in the axial direction by the worm 5 .

Specifically, the slider 2B is formed with a long hole 31 extending in its length direction, and the guide member 29 is provided with a guide pin 32 that extends through the long hole 31. Note that the guide bin 32 has a washer 328, and the presence of this washer 32a prevents the Jffll+ child 28 from coming off the guide bin 32. In this way, slider 2
8 can slide within the range in which the elongated hole 31 and the girder/32 can slide relative to each other.

Further, the slider 28 has a fitting protrusion 33 that fits into the groove of the worm 5 at its tip. In addition, IF7 7-
28 is a displacement member 3 rotatably mounted on the cam plate 13 so that it can come into contact with the lever 2. Specifically, the lever 2 has a side protrusion 34. On the other hand, the slider 28 has an engaging protrusion 3 that can engage with this side protrusion 34.
5.

The spring 30 always urges the slider 28 to return to a position approximately at the center of its sliding range.

A car with the above configuration! ! How the IJ device 27 operates will be explained mainly with reference to FIG.

First, the state shown in FIG. 7(a) is a stop mode.

In this state, the slider 28 is urged by the spring 30 to slide to the right. Therefore, slider 2
The fitting protrusion 33 of 8 is pressed against one end surface of the crest of the worm 5. The shape M T shown in FIG. 7 <a>,
-1Fr Knee REW mode switch is turned on: When the worm 5 is turned on, the worm 5 rotates in the direction shown by the arrow in FIG. 7(b). As a result, the fitting projection 33 of the slider 28 moves to the right along the groove of the worm 5, and accordingly the slider 28 also moves to the right vJ'! It will happen. 1 student 28
The state after the movement is the state shown in FIG. 7(b). In this state, the slider 28 is urged by the spring 30 to move to the left. Therefore, the fitting protrusion 33 is pressed against the other end surface of the crest of the worm 5.

Thereafter, the rotation of the worm 5 is transmitted to the cam 1fii11 via the gear train, and as a result, the cam plate 11 moves to the right. Along with this, the lever 2 and the cam plate 13 also move to the right, resulting in the state shown in FIG. 7(C).

The state shown in FIG. 7(C) is the FF-REW mode.

When the stop switch is turned on in the FF-REW mode, the worm 5 rotates in the direction shown by arrow E in FIG. 7(d). Then, the fitting protrusion 33 of the slider 28 rapidly moves to the left along the groove of the worm 5. That is, the slider 28 rapidly moves to the left. During the movement of the slider 28, the engagement protrusion 35 of the slider 28
presses the lateral protrusion 34 of the lever 2, so that the lever 2
Rotate clockwise in the figure. An excellent state in which the lever 2 is rotated is shown in FIG. 7(d). As shown in the figure, in this state, the pin 20 of the lever 2 and the notch 21 of the cam plate 11 are disengaged. Therefore, the cam plate 13 moves to the left by the action of the spring 22 (see FIG. 5), and as a result, the restraint of the brake member 23 by the notch 26 of the cam plate 13 is released. In this way, the brake members 2 and 3 are rotated clockwise by the action of the spring 25 and come into pressure contact with the reel stand 4. In this way, the reel stand 4 can be braked in an extremely short time.

Although the above-described embodiment is configured to brake the rotation of the reel stand of a magnetic recording/reproducing device, the present invention may be applied to other @ positions or mechanisms. Of course, the present invention can be applied to all kinds of devices in which it is necessary to displace a displaceably displaceable member in a short time using the rotation of a motor.

[Effects of the Invention] As described above, according to the present invention, the slider that can come into contact with the displacement member is configured to directly slide linearly by the rotation of the worm. The displacement member can be displaced in an extremely short time according to the rotation of the motor.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a conventional drive device configured to brake the rotation of a reel stand of a magnetic recording and reproducing device. is prohibited. FIG. 2 is a schematic diagram of the gear portion in FIG. 1 viewed from the side. FIG. 3 is a diagram showing a transition from the stop mode shown in FIG. 1 to a fast forward/rewind state (FF-REW mode). Fourth
The figure shows a state in which the brake is applied in the FF-REW mode shown in FIG. 3. The fifth factor is a plan view showing an embodiment of the present invention configured to brake the rotation of a reel stand of a magnetic recording/reproducing device, and the illustrated state is a stop state (stop mode). FIG. 6 is a perspective view showing an embodiment of the present invention. FIG. 7 is a plan view showing one embodiment of the present invention, and sequentially shows its operation. In the figure, 3 is a motor, 5 is a worm, 28 is a slider, 29 is a guide member, and 30 is a spring. Agent Daisugu Masu Yuman 1 Figure 2

Claims (1)

[Scope of Claims] A drive device for displacing a displacement member displaceably provided using the rotation of a motor, the drive device comprising a worm connected to a shaft of the motor and a worm that abuts the displacement member. a slider that is arranged so as to be slidable in the axial direction of the worm, and further has a fitting protrusion that fits into a groove of the worm; a guide member that guides the slider so that it does not come off the groove;
A drive device comprising a spring that always urges the drive device to return to a position approximately at the center of its sliding range.