JPH09180310A - Vcr reel driving device and method for preventing malfunction of reel driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a large torque in a slip mode and to enable high-speed traveling in a direct mode by transmitting the rotary driving force of a reel gear member through an idler device to a reel table member. SOLUTION: In a direct mode, the clutch wheel 160 of a reel driving device 100 and a reel gear member 180 are moved downward. By engaging a large diameter gear 182 of a reel gear 185 with a small gear 214 of an idler device 200, an idler gear member 210 is rotated at a high speed. In a slip mode, the clutch wheel 160 and the reel gear member 180 are moved upward. By engaging a small gear 181 with a large gear 213, the idler gear member 210 is rotated at a low speed. Thus, in the direct mode, a tape is quickly taken up by rotating a reel table member 250 at a high speed and in the slip mode, by increasing the torque of the reel table member 150, a stable reproducing operation is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel drive device for a VCR and a method for preventing malfunction of the reel drive device, and more particularly, to a reel drive device for a VCR that operates effectively between a direct mode and a slip mode of the VCR and the reel drive device. The present invention relates to a method for preventing malfunction of a clutching device installed in a reel driving device.

[0002]

2. Description of the Related Art Generally, a VCR (Video cassette recor) is used.
der, or video cassette recorder)
As shown in FIG. 1, a head drum 12 installed on a base plate 10 for detecting data from a magnetic tape, a pair of reel table members 250 installed on the base plate 10 for winding a magnetic tape, and this pair of reel table members. An idler device 200 installed at an intermediate portion of the reel 250 for transmitting power to each reel table member 250, and a reel table member 25 via the idler device 200.
The reel driving device 20 for rotating 0, the capstan motor 13 for driving the reel driving device 20, and the like are provided. The idler device 200 is a reel drive device 20.
Is selectively connected to both reel table members 250 in a state of being connected to the reel drive member 20, and thereby the power from the capstan motor 13 transmitted to the reel drive device 20 is selectively transmitted to both reel table members 250. The reel driving device 20 drives a reel table member 250 connected to the idler device 200.

The operation modes of the VCR include a direct mode for winding the tape at a high speed and a slip mode for reproducing the contents of the tape. Switching between the direct mode and the slip mode is performed by the reel driving device 20. That is, the rotation speed of the capstan motor 13 is VCR.
Is changed by the reel driving device 20 according to the operation mode of the above and is transmitted to the idler device 200.

FIG. 2 is a vertical cross-sectional view of a conventional VCR showing a reel drive device in a slip mode state. As shown in the figure, a conventional reel drive device 20 includes a shaft 21 installed on a base plate 10 and a reel gear 30 rotatably installed on the shaft 21 and connected to an idle gear (not shown) of an idler device 200. A clutch wheel 40 that is pressed by the reel gear 30 and rotates integrally with the reel gear 30;
Reel base 50 that has a boss 51 that is pushed in and rotates as a unit, a pulley 60 that is mounted on the shaft 21 so as to be rotatable relative to the reel gear 30 and the reel base 50, and a pulley 60 that moves the clutch wheel 40 downward. And a clutch plate 70 for performing a clutching operation between the reel gear 30 and the reel gear 30. A clutch base 75 is provided between the clutch wheel 40 and the pulley 60.
Is installed. The clutch base 75 rotates integrally with the pulley 60. A felt 53 is interposed between the pulley 60 and the reel base 50. The felt 53 is in contact with the pulley 60 and the reel base 50 while applying a predetermined frictional force. The pulley 60 is connected to the capstan motor 13 by the belt 15.

When the capstan motor 13 rotates in the slip mode, the pulley 60 connected via the belt 15 rotates. If the pulley 60 rotates, the felt 53
The reel base 50 connected by is rotated. At this time, since the reel base 50 is rotated by the frictional force of the felt 53 transmitted from the pulley 60 when the pulley 60 is rotated, the reel base 50 does not rotate at the same speed as the pulley 60 and a predetermined ratio (about 3: 1). Deceleration rotation to the ratio of. The reel base 50 rotates the reel gear 30 pushed into the boss 51. The reel gear 30 rotates the idler gear of the idler device 200, and accordingly, the reel table member 250 connected to the idler gear rotates.

When the direct mode is activated, the clutch plate 70 moves downward to move the clutch wheel 40.
To move the clutch wheel 40 downwards.
Has a lower end portion that meshes with the clutch base 75.
When the pulley 60 is rotated by the capstan motor 13, the pulley 60 and the clutch base 75 rotate integrally, so that the clutch wheel 40 meshed with the clutch base 75 also rotates integrally with the pulley 60. Therefore, the reel gear 30 that rotates integrally with the clutch wheel 40 also rotates at the same speed as the pulley 60.

Thus, in the slip mode, the pulley 6
As compared with the rotation speed of 0, the rotation speed of the reel gear 30 is reduced at a predetermined ratio, and in the direct mode, the reel gear 30 rotates at the same speed as the rotation speed of the pulley 60. Further, the idler device 200 is provided with a separate idler device driving means (not shown) for each reel table member 2.
It is selectively connected to 50, which allows the cassette to run in the forward direction or vice versa.

However, in the reel drive device 20 of the VCR as described above, the difference in rotational speed between the direct mode and the slip mode is caused by the clutching operation by the clutch wheel 40 and the deceleration by the felt 53, so that the cassette drive in the slip mode is performed. There has been a problem that the low speed running and the high speed running of the cassette in the direct mode cannot be effectively performed. That is,
Although the torque of the reel table member 250 for winding the tape must be large for stable reproduction operation in the slip mode, and it is desirable to take up the tape promptly in the direct mode. Then, such an effect cannot be sufficiently obtained.

Further, in the VCR, the required torque is different between the forward reproduction mode and the reverse reproduction mode, but in general, the reverse reproduction mode is better than the forward reproduction mode. Requires large torque. However, since the conventional reel drive device 20 drives the reel gear 30 with the same torque during the forward drive and the reverse drive, there is a problem in that the forward and reverse play cannot be smoothly performed.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to be able to generate a large torque in the slip mode and to perform high speed running in the direct mode. VCR that can
It is to provide. Another object of the present invention is to provide a VCR capable of generating a larger torque during a reverse reproduction operation than during a normal reproduction operation.

[0011]

According to the present invention, the above object is to provide a capstan motor, a pair of reel table members for moving a cassette in forward and backward directions, a shaft installed on a base plate, and the shaft. A reel gear member that is installed and is driven to rotate by the capstan motor and that includes a first gear and a second gear having different diameters;
And a reel driving device including a moving means for moving the reel gear member along the longitudinal direction of the shaft;
And a third gear which is engaged and disengaged with the first gear and the second gear, respectively, by the stop position of the reel gear member in the longitudinal direction of the shaft, and rotates integrally.
The present invention is achieved by a VCR including a gear and a fourth gear and including an idler device for transmitting a rotational driving force of the reel gear member to any one of the reel table members.

Here, the moving means supports the reel gear member so as to be movable along the longitudinal direction of the shaft, and a reel gear holder that rotates integrally with the reel gear member, and one of the reel gear holders in the longitudinal direction of the shaft. A support spring that applies an elastic force to the reel gear holder in a direction and a drive plate that moves the reel gear holder by resisting the elastic force of the support spring can be used.

Further, the reel driving device includes a pulley which is rotatably driven by the capstan motor, a reel base which rotates integrally with the spring holder, and the pulley which is interposed between the pulley and the reel base. It comprises a reel base felt that is in frictional contact with the reel base, and a clutching device that connects and disconnects the pulley and the reel gear member depending on the position of the reel gear member in the longitudinal direction of the shaft. It is desirable to further include a speed changing means for speed-changing and transmitting the rotation speed of the capstan motor to the reel gear member depending on a connection state between the idler gears. Here, the clutching device is
A clutch having a pulley protrusion formed to protrude from one portion of the pulley, and a clutch protrusion that rotates integrally with the reel gear member and meshes with the pulley protrusion depending on a position of the reel gear member in the longitudinal direction of the shaft of the reel gear member. Can be configured into a wheel.

Further, the reel drive device is a clutch holder rotatable relative to the pulley and the reel gear holder, and a one-way clutch for relatively rotating the reel gear holder and the clutch holder in only one direction. And a clutch holder felt which is interposed between the clutch holder and the pulley and frictionally contacts the clutch holder and the pulley, and the capstan motor of the capstan motor according to the rotational driving direction of the capstan motor. It is preferable to further include an auxiliary driving device for transmitting torque to the reel gear members in different magnitudes. The one-way clutch may be a clutch spring that surrounds the outer peripheral surface of the clutch holder.

Further, it is preferable to further include an idler device driving means for driving the idler device so that the reel gear member is selectively connected to any one of the reel table members.

Further, according to the present invention, a reel gear member having a first gear and a third gear, which are installed on a shaft installed on a base plate and have different diameters, and the reel gear member are provided along the longitudinal direction of the shaft. Moving means for moving the pulley, a pulley rotatably driven by a capstan motor, a decelerating means for decelerating and transmitting the rotational speed of the pulley to the reel gear member, and a pulley protrusion formed to project at one portion of the pulley. And a reel drive device comprising a clutching device having a clutch wheel having a clutch projection that rotates integrally with the reel gear member and meshes with the pulley projection at a stop position on the reel gear portion in the axial direction; and the reel gear. Depending on the stop position of the member in the longitudinal direction of the shaft, the first gear and the upper gear An idler device that includes a third gear and a fourth gear that are engaged and disengaged with the second gear and rotate integrally, and that transmits the rotational driving force of the reel gear member to any one of the reel table members. In the method for preventing malfunction of the clutching device of a VCR having: a step of driving the capstan motor to rotate the pulley at a predetermined speed; and a step of driving the moving means so that the clutch protrusion and the pulley are separated from each other. And a step of moving the clutch wheel so as to mesh with each other. A method for preventing malfunction of a clutch device of a VCR is provided.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. FIG. 3 shows a VCR according to the present invention.
4 is an exploded perspective view of the reel driving device of FIG.
4 is a side sectional view showing a coupled state of the reel driving device and the idler device, FIG. 4 is a side sectional view showing a slip mode, and FIG. 5 is a side sectional view showing a direct mode. Further, the present invention will be described with reference to FIG. The reel driving device 100 includes a shaft 110 installed on the base plate 10, a reel gear member 180 rotatably installed on the shaft 110, a reel gear holder 120 supporting the reel gear member 180, and a reel gear member 180 coupled by pushing. A clutch wheel 160 that rotates integrally with the reel gear member 180, a pulley 140 that is intermittently connected to the reel gear member 180 by the clutch wheel 160, and a reel base 130 that is installed on the shaft 110 so as to be rotatable relative to the pulley 140. have.

The reel gear member 180 includes a pair of reel gears 185 having different diameters. The reel gear 185 includes a small diameter first gear 181 and a large diameter second gear 182.
Consists of The first gear 181 is disposed above the second gear 182, and the first gear 181 and the second gear 182 are formed in contact with each other. A locking protrusion (not shown) is formed on the inner diameter surface of the reel gear member 180, and a groove (not shown) is formed in the vertical direction on the outer diameter surface of the reel gear holder 120. The locking protrusion is housed in the groove, whereby the reel gear member 180 and the reel gear holder 120 can move relative to each other in the vertical direction and rotate integrally with the shaft 110.

The clutch wheel 160 has a clutch protrusion 161 protruding downward, and the pulley 140 has a pulley protrusion 141 protruding upward. When the clutch wheel 160 moves downward, the clutch protrusion 1
When the clutch wheel 160 is moved upward, the clutch projection 161 and the pulley projection 141 are disengaged from each other.

The reel base 130 is formed in the shape of a circular flat plate, is installed under the pulley 140, and has a boss 131 penetrating the pulley 140 and extending upward. The reel base 130 is installed so as to be rotatable relative to the pulley 140. The inner diameter surface of the boss 131 is in contact with the shaft 110, and the upper end portion is pressed into the reel gear holder 120. Therefore, the reel base 130 and the reel gear holder rotate together.

A reel base felt 135 is installed between the pulley 140 and the reel base 130. The reel base felt 135 applies a frictional force to the reel base 130 when the pulley 140 rotates. Therefore, the pulley 1
If 40 rotates, the rotational force will be reel base felt 13
5 and is transmitted to the reel base 130, whereby the reel base 130 rotates. At this time, the pulley 140
Due to the reel base felt 135, the reel base 130 does not rotate at the same speed but rotates at a predetermined ratio (ratio of about 3: 1). Therefore, the rotation speed of the reel base 130 is reduced as compared with the rotation speed of the pulley 140, and the reel gear member 18 that rotates integrally with the reel base 130.
0 also rotates more slowly than the pulley 140.

Pulley 140 and reel gear holder 120
Are connected by an auxiliary drive device 150. The auxiliary drive device 150 transmits the torque when the capstan motor 13 is rotationally driven in both directions to the reel gear member 180 with different magnitudes. The auxiliary drive device 150 includes a clutch spring 153, a clutch holder 151, and a clutch holder felt 155. The clutch holder 151 is rotatable relative to both the pulley 140 and the reel gear holder 120 so that the shaft 11 can rotate.
Set to 0. The clutch holder felt 155 is interposed between the lower surface of the clutch holder 151 and the upper surface of the pulley 140, and applies a frictional force between the pulley 140 and the clutch holder 151 when the pulley 140 rotates. The clutch spring 153 surrounds the outer diameter surface of the clutch holder 151 and has the reel gear holder 120 at the upper end.
It has a clutch spring protrusion 153a which is inserted into and fixed to the groove 126 at the lower end of the. The clutch spring 153 performs a clutching operation between the clutch holder 151 and the reel gear holder 120. That is, the clutch holder 151 is tightened in the direction in which the clutch spring 153 is tightened.
When the reel rotates, the rotational force is applied to the reel gear holder 120.
When the clutch holder 151 rotates in the direction of releasing the clutch spring 153, the rotational force is not transmitted to the reel gear holder 120. At this time, the direction in which the clutch spring 153 is tightened is the direction in which the tape runs in the reverse direction, and the direction in which the clutch spring 153 is released is the direction in which the tape runs in the positive direction.

A washer 1 is provided above the clutch holder 151.
71 is installed, and a compression spring 175 is installed above the washer 171. The compression spring 175 applies an elastic force in a direction in which the reel gear holder 120 and the clutch holder 151 are separated from each other. As a result, the reel gear holder 120 is located at the upper portion along the axial direction of the shaft 110, and the clutch holder 151 is attached to the pulley 1
Pressurize towards 40. Therefore, the clutch holder 1
51 and pulley 140 and pulley 140 and reel base 1
The clutch holder felt 155 and the reel base felt 135 retain the predetermined frictional force.

The clutch wheel 160 is moved vertically along the shaft 110 by the moving means. The moving means is a support spring 173, a drive plate 195,
A clutch drive member 197 is included. Support spring 173
Is installed between the reel gear holder 120 and the reel gear member 180. The support spring 173 elastically supports the reel gear member 180 upward with respect to the reel gear holder 120. As a result, the reel gear member 180 and the clutch wheel 160 maintain the state of being positioned above the shaft 110. Clutch drive member 19
7 is installed between the drive plate 195 and the clutch wheel 160. The drive plate 195 presses the clutch drive member 197 downward,
7 presses the clutch wheel 160 downward. Therefore, the clutch wheel 160 is moved downward in opposition to the elastic force of the support spring 173, and the clutch projection 16
1 and the pulley protrusion 141 are in mesh with each other as shown in FIG. As a result, the pulley 140, the clutch wheel 160, and the reel gear member 180 rotate integrally.

The idler device 200 includes the base plate 10
It is composed of an idler shaft 220 installed above, an idler gear member 210, and an idler spring 230. The idler gear member 210 is rotatably installed on the idler shaft 220. The idler spring 230 is installed below the idler gear member 210, and the idler gear member 2
Support 10 upwards. 2 idler gear members 210
It has one idle gear. The idle gear is composed of a third gear 213 formed on the upper portion of the idler gear member 210 and having a large diameter, and a fourth gear 214 formed on the lower portion of the idler gear member 210 and having a small diameter. The third gear 213 has a module that meshes with the first gear 181 of the reel gear member 180, and the fourth gear 214 has a module that meshes with the second gear 182 of the reel gear member 180. The third gear 213 and the fourth gear 214 are separated by a predetermined distance in the longitudinal direction of the idler shaft 220. When the reel base 130 and the clutch wheel 160 are moved upward by the elastic force of the support spring 173, the first gear 181 and the third gear 213 mesh with each other, and the reel base 130 and the clutch wheel 160 are moved downward by the moving means. Second gear 1
82 and the fourth gear 214 mesh with each other. The reel table member 250 includes a fifth gear 255. Fifth gear 25
The fifth gear meshes with the third gear 213.

An idler plate 190 is installed above the shaft 110. One end of the idler plate 190 is rotatably fixed to the shaft 110, and the other end is rotatably fixed to the idler shaft 220. The idler plate 190 rotates the idler device 200 with respect to the shaft 110. The idler device 200 is selectively connected to the two reel table members 250 according to the rotational position of the idler plate 190.

The operation of the VCR having the reel driving device according to the present invention will be described below. If the direct mode is activated, a microcomputer (not shown) will drive plate 1
95 is operated to pressurize the clutch drive member 197, and the clutch drive member 197 moves the clutch wheel 160 and the reel gear member 180 downward. As a result, as shown in FIG. 5, the second gear 182 and the fourth gear 21
4 meshes with each other, and the clutch protrusion 161 and the pulley protrusion 141.
Meshes with. The capstan motor 13 has a belt 144
The pulley 140 is rotated via the pulley 140, and the pulley 140 and the reel gear member 180 rotate integrally. Since the large-diameter second gear 182 meshes with the small-diameter fourth gear 214, the idler gear member 210 rotates at a high speed, which causes the reel table member 250 to rotate at a high speed. Therefore, the tape in the cassette can be wound at high speed. The tape winding direction is determined by the idler plate 190 and the capstan motor 13. That is, the idler plate 190 connects the idler device 200 to the reel table member 250 corresponding to the forward or reverse direction, and the capstan motor 13 is rotationally driven in the corresponding direction.

When the slip mode is operated, a microcomputer (not shown) releases the operation of the drive plate 195, and the elastic force of the support spring 173 causes the clutch wheel 160 and the reel gear member 180 to move upward. As a result, as shown in FIG. 4, the first gear 181 and the third gear 213 mesh with each other, and the clutch protrusion 161 and the pulley 141.
Are separated from each other. The capstan motor 13 rotates the pulley 140 via the belt 144, and the pulley 140 rotates the reel base 130 at a speed reduced by a predetermined ratio through the reel base felt 135. The reel base 130 rotates the reel gear member 180 via the reel gear holder 120. The idler gear member 210 rotates at a low speed due to the meshing of the small diameter first gear 181 and the large diameter second gear 182, whereby the reel table member 250 also rotates at a low speed. Therefore, the tape is driven at a low speed and the reproducing operation is performed. The running direction of the tape is determined by the idler plate 190 and the capstan motor 13 as in the direct mode. That is, the idler plate 190 connects the idler device 200 to the reel table member 250 corresponding to the forward or reverse direction, and the capstan motor 13 is rotationally driven in the corresponding direction.

The rotational force of the pulley 140 is transmitted to the clutch holder 151 via the clutch holder felt 155. During reverse rotation, the rotational force of the clutch holder 151 is transmitted to the reel gear holder 120 via the clutch spring 153, and the rotational force of the pulley 140 is transmitted to the reel gear holder 120 together with the reel base 130 via the clutch holder 151. As a result, the rotational force of the reel gear member 180 increases. When rotating in the forward direction, the rotational force of the clutch holder 151 is blocked by the clutch spring 153, and the rotational force of the pulley 140 is transmitted to the reel gear holder 120 only via the reel base 130. As a result, the rotational force of the reel gear member 180 is reduced. As described above, since a larger rotational force is applied during reverse rotation than during forward rotation, stable reproduction operation can be performed during reverse rotation that requires a larger rotational force than during normal reproduction.

Hereinafter, a VC having the above reel drive device
A malfunction prevention method will be described in order to make the switching operation from the slip mode to the direct mode in R more accurate. When switching from the slip mode to the direct mode, the clutch wheel 160 descends. On this occasion,
The clutch protrusion 161 and the pulley protrusion 141 may overlap each other without meshing with each other, and the clutch wheel 160 and the pulley 140 may not be coupled to each other. A method for preventing malfunction of the clutching device for preventing this is as shown in the figure.

When the operation of the VCR is started, the microcomputer is initialized to the state required for the operation of the VCR (S1). At this time, the reel driving device 100 is in the slip mode state. The microcomputer determines whether it is in direct mode (S
2) If NO (NO), the reproduction operation is performed in the slip mode state (S3), and if YES (YES), the malfunction prevention operation is performed (S4). First, the microcomputer drives the capstan motor 13 to rotate the pulley 140 at a predetermined speed. Here, the predetermined speed is the same as the rotation speed of the capstan motor in the slip mode. While the pulley 140 rotates, the microcomputer operates the drive plate 19
5 is driven to move the clutch wheel 160 downward. Since the pulley 140 rotates while the clutch wheel 160 moves downward, even if the clutch protrusion 161 and the pulley protrusion 141 overlap with each other, they are separated from each other in the rotation direction, whereby the clutch protrusion 161 and the pulley protrusion 1 are separated from each other.
41 will be in mesh with each other. If the clutch protrusion 161 and the pulley protrusion 141 mesh with each other, the direct mode is performed. Thus, by rotating the pulley 140 while the clutch wheel 160 moves downward, the slip mode is accurately switched to the direct mode without causing a malfunction in the clutching operation.

Although the present invention has been specifically described based on the preferred embodiments, the present invention is not limited thereto and can be modified and improved without departing from the gist of the present invention. Of course.

[Brief description of the drawings]

FIG. 1 is a schematic view of a general VCR deck.

FIG. 2 is a vertical cross-sectional view of a conventional VCR reel driving device.

FIG. 3 is an exploded perspective view of a reel driving device of a VCR according to the present invention.

4 is a side view of the reel drive device and the idler device of FIG. 3 in a coupled state, and is a side sectional view showing a slip mode.

5 is a side view of the reel drive device and the idler device of FIG. 3 in a coupled state, and is a side sectional view showing a direct mode.

FIG. 6 is a flowchart of a method for preventing malfunction of a clutching device in a reel driving device of a VCR according to the present invention.

[Explanation of symbols]

 110 Shaft 120 Reel Gear Holder 130 Reel Base 135 Reel Base Felt 140 Pulley 150 Auxiliary Drive 151 Clutch Holder 153 Clutch Spring 155 Clutch Holder Felt 160 Clutch Wheel 171 Washer 173 Support Spring 175 Compression Spring 180 Reel Gear Member 195 Drive Plate 197 Clutch Drive Member 200 idler device

Claims (10)

[Claims] 1. A capstan motor; a pair of reel table members for moving a cassette in forward and reverse directions; a shaft installed on a base plate; and a shaft installed on the shaft and rotationally driven by the capstan motor and having different diameters. A reel gear member including a first gear and a second gear, and a reel driving device including a moving unit that moves the reel gear member along the longitudinal direction of the shaft; and each reel gear member on the longitudinal direction of the shaft. Depending on the stop position, the first gear and the second gear
Gears are respectively provided with a third gear and a fourth gear that are engaged and disengaged to rotate integrally, and the rotational driving force of the reel gear member is applied to any one of the reel table members.
VC including an idler device for transmission to one
R. 2. A reel gear holder that rotatably supports the reel gear member along the longitudinal direction of the shaft and rotates together with the reel gear member, and one of the reel gear members on the longitudinal direction of the shaft. 2. The VCR according to claim 1, further comprising: a support spring that applies an elastic force to the reel gear holder in a direction, and a drive plate that resists the elastic force of the support spring to move the reel gear holder. 3. The reel driving device further comprises a speed change means for speed-changing and transmitting the rotation speed of the capstan motor to the reel gear member according to a connection state between the reel gear member and the idler. Item 2. The VCR according to Item 2. 4. The transmission means is interposed between a pulley rotatably driven by the capstan motor, a reel base that rotates integrally with the spring holder, the pulley and the reel base, and the pulley and the reel base. A reel base felt that frictionally contacts the reel base, and a clutching device that connects and disconnects the pulley and the reel gear member depending on the position of the reel gear member in the longitudinal direction of the shaft. VCR according to item 3. 5. The clutching device rotates integrally with a pulley protrusion formed at one portion of the pulley, the pulley protrusion being formed at a portion of the pulley, and depending on a position of the reel gear member in the longitudinal direction of the shaft. 5. A V as claimed in claim 4 including a clutch wheel having a clutch projection which can be meshed with a pulley projection.
CR. 6. The reel driving device further includes an auxiliary driving device for transmitting torque of the capstan motor to the reel gear member in different magnitudes according to a rotational driving direction of the capstan motor. A VCR according to claim 5, characterized in that 7. The auxiliary drive device includes a clutch holder rotatable relative to the pulley and the reel gear holder, and a one-way clutch that relatively rotates the reel gear holder and the clutch holder in only one direction. 7. The VCR according to claim 6, further comprising: a clutch holder felt interposed between the clutch holder and the pulley and frictionally contacting the clutch holder and the pulley. 8. The VCR according to claim 7, wherein the one-way clutch is a clutch spring that surrounds an outer peripheral surface of the clutch holder. 9. The apparatus according to claim 1, further comprising an idler device driving means for driving the idler device so that the reel gear member is selectively connected to any one of the reel table members. VCR as described. 10. A reel gear member provided on a shaft mounted on a base plate, the reel gear member having a first gear and a third gear having different diameters, and a moving means for moving the reel gear member along the longitudinal direction of the shaft. A pulley that is rotatably driven by a capstan motor, a speed reducer that reduces and transmits the rotational speed of the pulley to the reel gear member, a pulley protrusion that projects from one portion of the pulley, and the reel gear member Reel drive device comprising a clutching device having a clutch wheel having a clutch projection that rotates as a shaft and meshes with the pulley projection according to the axial stop position of the reel gear member; and the longitudinal direction of the shaft of the reel gear member. Depending on the upper stop position, the first gear and the second gear are respectively The above-mentioned VCR having a third gear and a fourth gear which are engaged and disengaged to rotate integrally and which has an idler device for transmitting the rotational driving force of the reel gear member to any one of the reel table members. In a method of preventing malfunction of a clutching device, a step of driving the capstan motor to rotate the pulley at a predetermined speed, and driving the moving means so that the clutch protrusion and the pulley protrusion mesh with each other. A method of preventing malfunction of a clutch device of a VCR, comprising: moving the clutch wheel.