GB2307775A - Reel driving apparatus for a video cassette recorder - Google Patents
Reel driving apparatus for a video cassette recorder Download PDFInfo
- Publication number
- GB2307775A GB2307775A GB9624830A GB9624830A GB2307775A GB 2307775 A GB2307775 A GB 2307775A GB 9624830 A GB9624830 A GB 9624830A GB 9624830 A GB9624830 A GB 9624830A GB 2307775 A GB2307775 A GB 2307775A
- Authority
- GB
- United Kingdom
- Prior art keywords
- reel
- pulley
- clutch
- gear
- gear member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/44—Speed-changing arrangements; Reversing arrangements; Drive transfer means therefor
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- Gear Transmission (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Transmission Devices (AREA)
Abstract
A reel drive 100 rotated by a capstan motor (13, figure 1) through a belt 144 provides two-speed drive to a reel 250 by way of an idler 200. The drive 100 has two gears 181, 182 of different diameter respectively engagable with two gears 213, 214 on the idler 200 to transmit two different speeds to the reel 250. The gears 181, 182 are carried on a support 180 movable axially on a shaft 110 to change speed. The drive 100 also has clutch means 141, 161.
Description
REEL DRIVING APPARATUS FOR A VIDEO CASSETTE RECORDER
AND
NETHOD FOR PREVENTING MALFUNCTION THEREOF
Background of the invention
1. Field of the invention
The present invention relates to a reel driving apparatus for a video cassette recorder (VCR) and a method for preventing malfunction thereof, and more particularly, to a reel driving apparatus for a VCR which operates effectively in a direct mode and a slip mode, and a method for preventing malfunction of clutching device in such a reel driving apparatus.
2. Prior Art
Generally, a VCR has, as shown in FIG. 1, a head drum 12 mounted on a base plate 10 for reading the data in the magnetic tape of a cassette, a pair of reel table members 250 mounted on the base plate 10 for driving the cassette, an idler 200 disposed between the reel table members 250 which transmits the driving force to the reel table members 250, and a capstan motor 13 for driving a reel driving apparatus 20. The idler device 200 is alternatively connected to the reel table members 250, 250' along with being connected to the reel driving apparatus 20, and then transmits the driving force from the capstan motor 13 to the reel table members 250, 250' alternatively. The reel driving apparatus 20 drives reel table members 250, 250' connected to the idler device 200.
The operation modes of the VCR are classified into a direct mode which winds a tape with a high speed, and a slip mode which plays the cassette. Transition from the direct mode to the slip mode and vice versa is executed by the reel driving apparatus 20. That is, the rotational velocity of the capstan motor 13 is changed according to the operation mode of VCR and transmitted to the idler 200.
FIG. 2 is a sectional view of a conventional reel driving apparatus of a VCR, which shows the slip mode state of the reel driving apparatus. As shown in FIG. 2, the conventional reel driving apparatus 20 has a shaft 21 mounted on the base plate 10, a reel gear 30 installed rotatably on the shaft 21 and connected to an idle gear (not shown) in the idler 200, a clutch wheel 40 force-fitted to the reel gear 30 in order to be rotated together with the reel gear 30, a reel base 50 having a boss 51 force-fitted to the reel gear 30 in order to be rotated together with the reel gear 30, a pulley 60 installed on the shaft 21 and relatively rotating to the reel gear 30 and reel base 50, and a clutch plate 70 which executes clutching operation between the pulley 60 and reel gear 30 by moving the clutch wheel 40 downwardly.Between the clutch wheel 40 and the pulley 60 a clutch base 75 is disposed. The clutch base 75 rotates together with the pulley 60. Between the pulley 60 and the reel base 50 a felt 53 is disposed. The felt 53 remains in frictional contact with the pulley 60 and the reel base 50. The pulley 60 is connected to the capstan motor 13 by a belt 15.
In the state of slip mode, when the capstan motor 13 is rotated, the pulley 60 is rotated by the belt 15. Also when the pulley 60 is rotated, the reel base 50 is rotated by the felt 53. Since the reel base 50 is rotated by the frictional force generated between the felt 53 and the pulley 60, the reel base 50 is rotated with a reduced velocity which is different from the velocity of the pulley 60 and has a ratio of about 3:1. Also, the reel base 50 rotates the reel gear 30 which is force-fitted with the boss 51 thereof. The reel gear 30 rotates the idle gear (not shown) in the idler 200, and then the reel table member 250 which is connected to the idle gear is rotated.
When a user selects the direct mode, the clutch plate 70 moves downwardly in order to move the clutch wheel 40 downwardly, and then the lower part of the clutch wheel 40 is engaged with the clutch base 75. When the pulley 60 is rotated by the capstan motor 13, the clutch wheel 40 engaged with the clutch base 75 rotates because the clutch base 75 is rotated together with the pulley 60. Accordingly, the reel gear 30 rotating together with the clutch wheel 40 rotates at the same rotational velocity as that of the pulley 60.
As described above, the rotation velocity of the reel gear 30 is reduced at a certain ratio in comparison with that of the pulley 60 in the slip mode, and is the same velocity as that of the pulley 60 in the direct mode.
The idler 200 is alternatively connected to the reel table members 250, 250' by an idler driving means (not shown), and then the cassette is driven in a forward or reverse rotational direction.
However, in the conventional reel driving apparatus 20, there is a problem that can not efficently perform the low speed driving operation during the slip mode and the high speed driving operation during the direct mode, since the difference of the rotational velocities in the direct mode and the slip mode is only generated by the clutching operation of the clutch wheel 40 and the velocity reduction of the felt 53.
Moreover, the torques required in the play operations during forward and reverse directions are different from each other in VCR, and in play operation, generally greater torque is required in the reverse direction than in the forward direction. However, since the conventional reel driving apparatus 20 drives to both directions with the same torques, the forward and reverse play operations are not performed efficiently.
Summarv of the invention
The present invention has been produced to overcome the above described problems of the prior art, and accordingly it is an object of the present invention to provide a VCR which generates a large torque in slip mode and performs high speed driving operation during the direct mode.
Also, it is another object of the present invention to provide a VCR which generates larger torque in the reverse direction than in the forward direction during play operation.
To achieve the above object, the present invention provides a VCR comprising: a capstan motor; a pair of reel table members for driving a cassette in forward and reverse rotational directions; a reel driving apparatus having a shaft, a reel gear member and a moving means, said shaft being mounted on a base plate, said reel gear member installed on said shaft and rotated by said capstan motor, said reel gear member having a first gear and a second gear which have different diameters from each other, said moving means for moving said reel gear member along a longitudinal direction of said shaft; and an idler having a third gear and a fourth gear rotating together, said third gear and said fourth gear being respectively engaged and disengaged with said first gear and said second gear according to a position of said reel gear member along the longitudinal direction of said shaft, whereby a torque of said reel gear member is transmitted to one of said reel table members.
It is preferable that the moving means comprises: a reel gear holder for supporting said reel gear member, said reel gear holder being mevable respectively to said real gear member and rotating together with said reel gear member; a supporting spring for applying an elastic force to said reel gear holder toward one longitudinal direction of said shaft; and a driving plate which moves said reel gear holder against the elastic force of said supporting spring
Additionally it is more preferable if said reel driving apparatus further comprises a speed change means comprising: a pulley being rotated by said capstan motor; a reel base rotating together with said spring holder; a reel base felt being disposed between said pulley and said reel base, said reel base felt remaining in frictional contact with said pulley and said reel base; a clutching means for engaging and disengaging said pulley and said reel gear member according to the position of said reel gear member along the longitudinal direction of said shaft, whereby a rotational velocity of said capstan motor is changeably transmitted to said reel gear member according to an engaging state of said reel gear member and said idler. Also said clutching device may comprise a pulley protrusion being protruded on an area of said pulley; a clutch wheel for rotating together with said reel gear member and having a clutch protrusion, said clutch protrusion being engaged with said pulley protrusion according to the position of said reel gear member along the longitudinal direction of said shaft.
Furthermore, it is still more preferable if said reel driving apparatus comprises an auxiliary driving device compriseing: a clutch holder for rotating relatively to said pulley and said reel gear holder; a one way clutch for rotating said reel gear holder and said clutch relatively in only one rotational direction; a clutch holder felt being disposed between said clutch holder and said pulley, said clutch holder felt remaining in frictional contact with said clutch holder and said pulley, whereby torque of said capstan motor is transmitted differently according to the rotational directions of said capstan motor. Preferably, said one way clutch is a clutch spring wrapped around an outside surface of said clutch holder.
Furthermore it is even more preferable to further comprise an idler driving means for driving said idler in order to connect said reel gear member to said reel table members alternatively.
According to the present invention, a method for preventing malfunction of a clutching device in such a VCR is provided.
Brief Descrittion of the Drawings
The present invention will be better understood and its various objects and advantages will be more fully appreciated from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic view of a VCR deck;
FIG. 2 is a sectional view of a conventional reel driving apparatus of a VCR;
FIG. 3 is an exploded perspective view of a reel driving apparatus of a VCR according to the present invention;
FIG. 4A and FIG. 4B are sectional views of assembled state of the reel driving apparatus of FIG. 3 and an idler, in which FIG. 4A shows slip mode and FIG. 4B shows direct mode; and
FIG. 5 is a flow chart of the method for preventing malfunction of the clutching device in the reel driving apparatus of the VCR according to the present invention.
Detailed DescriPtion of the Preferred Embodiment
Hereinafter the present invention will be described in detail with reference to the drawings.
FIG. 3 is an exploded perspective view of a reel driving apparatus of a VCR according to the present invention, and FIG. 4A and FIG. 4B are sectional views of assembled state of the reel driving apparatus of FIG. 3 and an idler, which sectional views show slip mode and direct mode respectively. Also the present invention will be described with reference to the FIG. 1, too. The reel driving apparatus 100 has a shaft 110 mounted on the base plate 10, a reel gear member 180 installed rotatably on the shaft 110, a reel gear holder 120 supporting the reel gear member 180, a clutch wheel 160 force-fitted to the reel gear member 180 and rotating together with the reel gear member 180, a pulley 140 connected or disconnected to the reel gear member 180 by the clutch wheel 160, and a reel base 130 installed on the shaft 110 which reel base 130 is relatively rotatable thereto.
The reel gear member 180 has a pair of reel gears 185.
The reel gears 185 consist of the first gear 181 having a small diameter and the second gear 182 having a large diameter. The first gear 181 is disposed in the upper side of the second gear 182, and the first gear 181 and the second gear 182 are formed to remain in contact with each other. The reel gear member 180 is formed with a protrusion (not shown) on the inside diameter surface thereof, and the reel gear holder 120 is formed with a groove (not shown) on the outside diameter surface thereof. The protrusion of the reel gear member 180 is accommodated in the groove of the reel gear holder 120, and then the reel gear member 180 and the reel gear holder 120 are capable of relative movement to each other, and rotate together with respect to the shaft 110.
The clutch wheel 160 has a clutch protrusion 161 being protruded upwardly, and the pulley 140 has a pulley protrusion 141 being protruded upwardly. The clutch protrusion 161 and the pulley protrusion 141 are engaged with each other in the state that the clutch wheel 160 is moved downwardly, and disengaged with each other in the state that the clutch wheel 160 is moved upwardly.
The reel base 130 having the shape of a disc is installed in the lower side of the pulley 140, and has a boss 131 extending upwardly and passing through the pulley 140. The reel base 130 is installed on the lower side of the pulley 140 and is relatively rotatable thereto. The inside diameter surface of the boss 131 renains in contact with the shaft 110, and the upper end of the boss 131 is force-fitted in the feel gear holder 120. Accordingly, the reel gear holder 120 rotates together with the reel base 130.
Between the pulley 140 and the reel base 130, a reel base felt 135 is disposed. The reel base felt 135 gives frictional force to the reel base 130 when the pulley 140 rotates. Accordingly, when the pulley 140 rotates, the torque thereof is transmitted to the reel base 130 through the reel base felt 135, and then the reel base 130 rotates.
At this time, due to the reel base felt 135, the reel base 130 is rotated not at the same rotational velocity as that of the pulley 140 but at the reduced velocity at a certain ratio of about 3:1. Accordingly, the rotational velocity of the reel base 130 is reduced in comparison with that of the pulley 140, and the reel gear member 180 rotating together with the reel base 130 rotates in a reduced rotation velocity in comparison with that of the pulley 140.
The pulley 140 and the reel gear holder 120 are connected by an auxiliary driving device 150. The auxiliary driving device 150 functions to transmit the torque of the capstan motor 13 in a different magnitude respectively when the capstan motor 13 rotates bidirectionally. The auxiliary driving device 150 consists of a clutch spring 153, a clutch holder 151, and clutch holder felt 155. The clutch holder 151 is installed on the shaft 110 and is relatively rotatable to the pulley 140 and the reel gear holder 120.
The clutch holder felt 155 is disposed between the lower surface of the clutch holder 151 and the upper surface of the pulley 140, and accordingly gives frictional force to the pulley 140 and the clutch holder 151 when the pulley 140 rotates. The clutch spring 153 is disposed to be wound around the outside diameter surface of the clutch holder 151, and has a clutch spring protrusion 153a at the upper end thereof which is fitted by insertion to a recess 126 formed at the lower end thereof. The clutch spring 153 performs clutching operation between the clutch holder 120 and the reel gear holder 120.That is, the torque of the clutch holder 151 is transmitted to the reel gear holder 120 if the clutch holder 151 rotates to the direction of fastening the clutch spring 153, and the torque of the clutch holder 151 is not transmitted to the reel gear holder 120 if the clutch holder 151 rotates in the direction of loosening the clutch spring 153. At this time, the direction of fastening is the reverse play direction of the cassette, and the direction of loosening is the forward play direction of the cassette.
A washer 171 is disposed on the upper side of the clutch holder, and a compression spring 175 is disposed on the washer 171. The compression spring gives elastic force to the reel gear holder 120 and the clutch holder 151 to the direction that the reel gear holder 120 and the clutch holder 151 become further away from each other.
Accordingly, the reel gear holder 120 is positioned on the upper side of the shaft, and the clutch holder 151 applies pressure to the pulley 140. Therefore, the clutch holder 151 and the pulley 140 maintain a certain frictional force due to the clutch holder felt 155, and the pulley 140 and the reel base also maintain a certain frictional force due to the reel base felt 135.
The clutch wheel 160 moves up and down along the shaft 110 by a moving means. The moving means comprises a supporting spring 173, a driving plate 195 and a clutch driving member 197. The supporting spring 173 elastically supports the reel gear member 180 onto the reel gear holder 120. As a result the reel gear member 180 and the clutch wheel 160 maintain a state of positioning at the upper side of the shaft 110. The clutch driving member 197 is disposed between the driving plate 195 and the clutch wheel 160. The driving plate 195 applies pressure to the clutch driving member 197 in the downward direction, and the clutch driving member 197 applies pressure to the clutch wheel 160 in the downward direction.Accordingly, the clutch wheel moves downwardly against the elastic force of the supporting spring 173, and the clutch protrusion 161 and the pulley protrusion 141 are engaged with each other as shown in FIG.
4B. Thus the pulley 140 and the clutch wheel 160 rotate together.
The idler 200 consists of a idler shaft 220 mounted on the base plate 10, 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 disposed in the lower part of the idler gear member 210 in order to upwardly support the idler gear member 210. The idler gear member 210 has two idle gears. The idle gears consist of the third gear 213 which is formed at the upper part of the idler gear member 210 and has a large diameter, and the fourth gear 214 which is formed at the lower part of the idler gear member 210 and has a small diameter. The third gear 213 has a module which make it possible to engage with the first gear 181 of the reel gear member 180, and the fourth gear 214 has a module which make it possible to engage with the second gear 182 of the reel gear member 180.
The third gear 213 and the fourth gear 214 are spaced at a certain distance along the longitudinal direction of the idler shaft 220. The first gear 181 and the third gear 213 are engaged with each other at the state that the reel base 130 and the clutch wheel 160 are moved up by the supporting spring, and the second gear 182 and the fourth gear 214 is engaged with each other at the state that the reel base 130 and the clutch wheel 160 is moved down by the moving means.
Each reel table member 250, 250' has a fifth gear 255.
The fifth gear 255 is engaged with the third gear 213.
An idle plate 190 is installed on the upper end of the shaft 110. One end of the idle plate 190 is pivotably fixed to the shaft 110, and the other end thereof is pivotably fixed to the idler shaft. The idler plate 190 causes the idler 200 to pivot with respect to the shaft 110. The idler 200 is alternatively engaged with the two reel table members 250, 250' according to the position due to pivoting of the idler plate 190.
Hereinbelow, the operation of VCR having the reel driving apparatus according to the present invention is described.
When the direct mode is operated, a microprocessor (not shown) drives the driving plate 195 in order to press the clutch driving member 197, and the clutch wheel 160 and the reel gear member 180 move downwardly by the clutch driving member 197. Therafter, as shown in FIG. 4B, the second gear 182 and the fourth gear 214 are engaged with each other, and the clutch protrusion 161 and the pulley protrusion 161 are engaged with each other. The capstan motor 13 rotates the pulley 140 through the belt 144, and the reel gear member 180 rotates together with the pulley 140. As the second gear 182 having a large diameter and the fourth gear 214 having a small diameter are engaged with each other, the idler gear member 210 rotates at high speed, and the reel table member 250 rotates at high speed too. Accordingly, the tape in the cassette is wound or rewound at high speed.
The winding direction of the tape is determined by the idler lever 190 and the capstan motor 13. That is, the idler lever connects the idler 200 to one of the reel table members 250, 250' corresponding to the forward or reverse winding direction, and the capstan motor rotates to the corresponding winding direction.
When the slip mode is operated, a microprocessor (not shown) releases the driving plate 195 in order not to press the clutch driving member 197, and the clutch wheel 160 and the reel gear member 180 move upwardly by the elastic force of the supporting spring 173. Therafter, as shown in FIG.
4A, the first gear 181 and the third gear 213 are engaged with each other, and the clutch protrusion 161 and the pulley protrusion 161 are disengaged with each other. The capstan motor 13 rotates the pulley 140 through the belt 144, and the pulley 140 rotates the reel base 130 through the reel base felt 135 at the reduced rotational velocity at a certain rate. The reel base 130 rotates the reel gear member through the reel gear holder 120. As the first gear 181 having a small diameter and the third gear 213 having a large diameter are engaged with each other, the idler gear member 210 rotates at low speed, and the reel table member 250 rotate at low speed too. Accordingly, the tape in the cassette travels at low speed, and the play operation is performed. The winding direction of the tape is, as in the direct mode, determined by the idler lever 190 and the capstan motor 13.That is, the idler lever connects the idler 200 to one of the reel table members 250, 250' corresponding to the forward or reverse winding direction, and the capstan motor rotates to the corresponding winding direction.
The torque of the pulley 140 is transmitted to the clutch holder 151 through the clutch holder felt 155. In the reverse direction, the torque of the clutch holder 151 is transmitted through the clutch spring 153, and accordingly the torque of the pulley 140 is transmitted to the reel gear holder 120 through the clutch holder 120 together through the reel base 130. Then, the torque of the reel gear member 180 becomes greater. In the forward direction, the torque of the clutch holder 151 is cut off by the clutch spring 153, and accordingly the torque of the pulley 140 is transmitted to the reel gear holder 120 through the reel base 130 only. Thus, the torque of the reel gear member 180 becomes a small amount.As described, since greater torque is transmitted at the reverse direction play mode, the play operation at the reverse direction which needs greater torque is performed stably too.
Hereinbelow, the method for preventing the malfunction of the VCR having the reel driving apparatus aforementioned, and which makes it possible to exactly convert from the slip mode to the direct mode will be described.
When the VCR converts its operation mode from the slip mode to the direct mode, the clutch wheel 160 moves downwardly. In such a situation, a time when the clutch protrusion 161 and the pulley protrusion 141 is not engaged but overlapped with each other may occur, so that the clutch wheel 160 and the pulley 140 do not engage with each other.
The method for preventing such a situation is shown in FIG.
5.
During the beginning operation of the VCR, the microprocessor is initialized in a state that is needed for operation of VCR S1. At that time, the reel driving apparatus 100 adjusts to the state of slip mode. The microprocessor determines whether the operation mode is direct mode S2 and performs play operation at the state of slip mode if the determination is NO S3. Also the method for preventing malfunction is performed if the determination is YES S4. At first, the microprocessor rotates pulley 140 at a predetermined velocity by driving the capstan motor 13.
The predetermined velocity is the velocity of the capstan motor 13 in slip mode. During the rotation of the pulley 140, the microprocessor moves the clutch wheel 160 downwardly by driving the driving plate 195. Since the pulley 140 rotates during the downward movement of the clutch wheel 160, even if the clutch protrusion 161 and the pulley protrusion 141 overlap with each other the clutch protrusion 161 and the pulley protrusion 141 become separated from with each other along the rotational direction, and then the clutch protrusion 161 and the pulley protrusion 141 become engaged with each other. Thereafter, the operation of the VCR in the direct mode is performed.
As described, since the pulley 140 is rotated during the downward movement of the clutch, malfunctioning of the clutching operation does not occur and the conversion from the slip mode to the direct mode is performed exactly.
Although the present invention has been described and illustrated in detail, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, wherein the spirit and scope of the present invention is limited only by the terms of the appended claims.
Claims (10)
1. A VCR comprising:
a capstan motor;
a pair of reel table members for driving a cassette in forward and reverse rotational directions;
a reel driving apparatus having a shaft, a reel gear member and a moving means, said shaft being mounted on a base plate, said reel gear member being installed on said shaft and rotated by said capstan motor, said reel gear member having a first gear and a second gear which have different diameters from each other, said moving means for moving said reel gear member along a longitudinal direction of said shaft; and
an idler having a third gear and a fourth gear rotating together, said third gear and said fourth gear being respectively engaged and disengaged with said first gear and said second gear according to a position of said reel gear member along the longitudinal direction of said shaft, whereby a torque of said reel gear member is transmitted to one of said reel table members.
2. The VCR as claimed in claim 1, wherein said moving means comprises:
a reel gear holder for supporting said reel gear member, said reel gear holder being movable respectively to said reel gear member and rotating together with said reel gear member;
a supporting spring for applying an elastic force to said reel gear holder toward one longitudinal direction of said shaft; and
a driving plate for moving said reel gear holder against the elastic force of said supporting spring.
3. The VCR as claimed in claim 2, wherein said reel driving apparatus further comprises:
a speed change means for changeably transmitting a rotational velocity of said capstan motor to said reel gear member according to an engaging state of said reel gear member and said idler.
4. The VCR as claimed in claim 3, wherein said speed change means comprises:
a pulley being rotated by said capstan motor;
a reel base rotating together with said spring holder;
a reel base felt being disposed between said pulley and said reel base, said reel base felt remaining in frictional contact with said pulley and said reel base;
a clutching means for engaging and disengaging said pulley and said reel gear member according to the position of said reel gear member along the longitudinal direction of said shaft.
5. The VCR as claimed in claim 4, wherein said clutching means comprises:
a pulley protrusion being protruded on an area of said pulley;
a clutch wheel for rotating together with said reel gear member and having a clutch protrusion, said clutch protrusion being engaged with said pulley protrusion according to the position of said reel gear member along the longitudinal direction of said shaft.
6. The VCR as claimed in claim 5, wherein said reel driving apparatus further comprises:
an auxiliary driving means for transmitting different torque of said capstan motor according to the rotational directions of said capstan motor.
7. The VCR as claimed in claim 6, wherein said auxiliary driving means comprises:
a clutch holder for rotating relatively to said pulley and said reel gear holder;
a one way clutch for rotating said reel gear holder and said clutch holder relatively in only one rotational direction;
a clutch holder felt being disposed between said clutch holder and said pulley, said clutch holder felt remaining in frictional contact with said clutch holder and said pulley;
8. The VCR as claimed in claim 7, wherein said one way clutch is a clutch spring wrapped around an outside surface of said clutch holder.
9. The VCR as claimed in claim 1, further comprising:
an idler driving means for driving said idler to connect said reel gear member to said reel table members alternatively.
10. A method for preventing malfunction of a clutching device in a VCR, said VCR having a reel driving apparatus and a idler, said reel driving apparatus comprising a reel gear member, a moving means, a pulley, a speed reducing means and a clutching device, said reel gear member installed on a shaft which is mounted on a base plate and having a first reel gear and a second reel gear which are different each other in diameter, said moving means moving said reel gear member along a longitudinal direction of said shaft, said pulley rotated by a capstan motor, said speed reducing means transmitting a rotational velocity of said pulley to said reel gear member in a reduced rotational velocity, said clutching device having a pulley protrusion and a clutch wheel, said pulley protrusion protruding on an area of said pulley, said clutch wheel rotating together with said reel gear member and having a clutch protrusion, said clutch protrusion being capable of engaging with said pulley protrusion according to the position of said reel gear member along the longitudinal direction of said shaft, said idler having a third gear and a fourth gear rotating together, said third gear and said fourth gear being respectively capable of engaging and disengaging to said first gear and said second gear according to a position of said reel gear along the longitudinal direction of said shaft, comprising the steps of
rotating said pulley by driving said capstan motor at a predetermined velocity; and
moving said clutch wheel with said moving means in order to engage said clutch protrusion with said pulley protrusion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950044347A KR0174974B1 (en) | 1995-11-28 | 1995-11-28 | Device for driving a reel of a tape recorder |
| KR1019950045182A KR0163319B1 (en) | 1995-11-30 | 1995-11-30 | A malfunction preventing method of reel clutch in accordance with a function mode change of vcr |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9624830D0 GB9624830D0 (en) | 1997-01-15 |
| GB2307775A true GB2307775A (en) | 1997-06-04 |
| GB2307775B GB2307775B (en) | 1999-11-24 |
Family
ID=26631433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9624830A Expired - Fee Related GB2307775B (en) | 1995-11-28 | 1996-11-28 | Reel driving apparatus for a video cassette recorder and method for preventing malfunction thereof |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH09180310A (en) |
| GB (1) | GB2307775B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2092808A (en) * | 1980-12-29 | 1982-08-18 | Sony Corp | Tape transport mechanisms for recording and/or reproducing apparatus |
-
1996
- 1996-11-28 GB GB9624830A patent/GB2307775B/en not_active Expired - Fee Related
- 1996-11-28 JP JP8317955A patent/JPH09180310A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2092808A (en) * | 1980-12-29 | 1982-08-18 | Sony Corp | Tape transport mechanisms for recording and/or reproducing apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9624830D0 (en) | 1997-01-15 |
| JPH09180310A (en) | 1997-07-11 |
| GB2307775B (en) | 1999-11-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
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