JP2003223750A - Videocassette recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a videocassette recorder in which a reel can securely be stopped without additional provision of other members. <P>SOLUTION: A winding reel gear 11 for rotational driving is formed on the outer circumference part, a winding reel 3 on which a videocassette is mounted and a cam gear 12 for driving members arranged adjacent to the winding reel 3 are provided. The winding reel gear 11 is arranged so that its outer circumference may partially overlap the outer circumference of the cam gear 12 in the perpendicular direction. A partial gear 22 which can mesh with the winding reel gear 11 is arranged on a part of the upper surface of the circumference of the cam gear 12. When the winding reel gear 11 meshes with the partial gear 22, the rotation of the winding reel 3 is locked, and when the winding reel gear 11 is free from meshing with the partial gear 22, the rotation of the winding reel 3 is allowed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video cassette recorder, and more particularly to a video cassette recorder having a reel stop mechanism.

[0002]

2. Description of the Related Art As a reel stop mechanism, a brake pad is brought into contact with and stopped by a reel. However, since the brake by the brake pad stops the reel by the frictional force, there is a risk that the brake will not work if the brake pad wears.

As a stop mechanism for a rotating body such as a reel, there are descriptions in Japanese Utility Model Publication No. 7-19895 and Japanese Utility Model Publication No. 7-19896. In these documents, a mechanism for stopping the rotating body by engaging a stop gear with a gear provided around the rotating body is described. By providing such a mechanism near the reel, the reel can be stopped.

On the other hand, in a video cassette recorder or the like in which a take-up reel and a rewind reel are driven by a single drive unit, the video tape bends when rewinding is performed during reproduction of the video tape. There is a risk that This is because both reels are in the free state during the mode change from the reproduction to the rewind. In a video cassette recorder having a single reel drive unit, in order to avoid bending of the video tape, a pre-winding mechanism is additionally provided to rotate the rewind reel during the mode change from reproduction to rewind.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention As reel stopping mechanisms, Japanese Utility Model Publication No. 7-19895 and Japanese Utility Model Publication No. 7-198
By using the device described in Japanese Patent Publication No. 96,
It is possible to more reliably stop the reel. However, it is necessary to provide a stop gear that meshes with the teeth of the reel in the vicinity of the reel and to have a mechanism that allows the stop gear to move. Therefore, an installation space for installing the stop gear is required. However, adding another member will increase the cost of the video cassette recorder. Further, if it is necessary to change the configuration inside the video cassette recorder to provide the stop gear, there is a possibility that the conventional components are not used, and the cost may increase due to the use of the dedicated components.

On the other hand, in a video cassette recorder in which both reels are driven by a single drive unit, a cost is required because a advance mechanism is separately provided. An object of the present invention is to provide a video cassette recorder which can reliably stop the reel without adding another member. Another object of the present invention is to provide a video cassette recorder having a structure capable of realizing the advance of the rewind reel without providing the advance mechanism.

[0007]

According to a first aspect of the present invention, there is provided a video cassette recorder comprising: a reel rotating member having a reel gear portion for rotational driving formed on an outer peripheral portion thereof, and a reel rotating member on which a video cassette is mounted; A video cassette recorder including a rotating member driving member arranged in the vicinity thereof, and arranged such that the reel gear portion and the outer peripheral portion of the rotating member partially overlap each other in the vertical direction. A partial gear that can mesh with the reel gear part is provided on a part of the outer peripheral portion of the upper surface of the rotating member.When the reel gear part meshes with the partial gear, the rotation of the reel rotating body is locked and It is characterized in that the rotation of the reel rotating body is allowed in a state where the mesh with the partial gear is released.

The video cassette recorder runs the tape of the video cassette by a reel rotating body. In addition, a rotating member for driving a member is rotatably provided near the reel rotating body. Here, the reel rotating body is stopped by rotating the rotating member to mesh the partial gear with the reel gear portion. By stopping the rotating member when the partial gear and the reel gear part mesh with each other, the reel can be reliably stopped. This rotating member
Since the video cassette recorder is provided for other purposes (for driving members), no additional member is required for the reel rotating body stopping mechanism. Therefore, it is possible to provide the reel rotating body stop mechanism in the video cassette recorder in a space-saving manner without changing the configuration.

A video cassette recorder according to a second aspect of the present invention is the video cassette recorder according to the first aspect, wherein the rotating member has a gear portion for driving it from the outside, and a cam groove inside. Further, a part of the arm for driving the pinch roller is engaged with the cam groove. Here, the rotating member is engaged with an arm for driving the pinch roller. The rotation of the rotating member drives the arm, which in turn drives the pinch roller. The rotating member can perform the function of stopping the reel rotating body together with the driving of the arm.

A video cassette recorder according to a third aspect of the present invention is the video cassette recorder according to the first or second aspect, wherein the rotating member has a pinion that is interlocked with the lower surface to rotate, and the pinion is further provided. Has a rack portion formed on the mode switching lever meshed with each other. Here, the pinion that rotates in conjunction with the rotating member engages with the rack portion. The rotation of the rotating member causes the rotation of the pinion, and the rack portion moves accordingly. Therefore, the rotation of the rotating member moves the mode switching lever. Therefore,
The rotating member can perform a function of moving the mode switching lever and a function of stopping the reel rotating body.

A video cassette recorder according to a fourth aspect of the present invention is the video cassette recorder according to the first aspect, wherein the reel rotating body is a rewinding reel. Further, the rotating member rotates the rewinding reel by a predetermined rotation angle by utilizing the meshing between the reel gear portion and the partial gear, and suppresses the slack of the tape of the video cassette. When the video cassette recorder has a single drive system, when the playback state is rewound, the drive transmission to the reel rotating body is switched, so the reel rotating body becomes free.
The tape may sag.

In this case, the slack of the tape is prevented by rotating the rewinding reel by a predetermined angle after the partial gear and the reel gear part are meshed with each other. This makes it possible to suppress the slack of the tape without additionally providing a dedicated member.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIG. 1 shows the overall structure of a video cassette recorder according to a first embodiment of the present invention.
Shown in. FIG. 2 shows the take-up reel peripheral portion. <Overall Configuration of Video Cassette Recorder> The video cassette recorder supplies the magnetic tape 1 of the video cassette from the rewinding reel 2 to the take-up reel 3 and records an image / sound signal on the magnetic tape 1 as magnetic data by a magnetic head (not shown). It is a playback device. FIG. 1 shows a state in which almost all of the magnetic tape 1 is wound on the winding reel 3.

Rewind reel 2 and take-up reel 3
Are driven by a rotary drive. The rotation drive device has a capstan motor 4 as a drive source, and a belt 5 for transmitting the rotation of the capstan motor 4 to each reel, a clutch mechanism 6, an idler gear 7, a sensor gear 8, and an intermediate gear 9. have.

The belt 5 is stretched between a pulley provided on the capstan motor 4 and a pulley provided on the clutch mechanism 6. The clutch mechanism 6 is a mechanism for transmitting the rotation from the capstan motor 4 to the idler gear 7. The idler gear 7 is rotatable by a swinging unit 10 having a rotation axis of the clutch mechanism 6 as a fulcrum, and transmits the rotation from the clutch mechanism 6 to the take-up reel 3 or the rewind reel 2. It is a gear for selecting one of them. That is, when the idler gear 7 and the gear provided on the rewinding reel 2 mesh with each other, the rotation is transmitted from the idler gear 7 to the rewinding reel 2. As a result, the rewind reel 2 rotates, and the magnetic tape 1 is rewound. On the other hand, when the idler gear 7 and the sensor gear 8 mesh with each other, the rotation is transmitted from the idler gear 7 to the sensor gear 8.

The sensor gear 8 is a gear meshing with the idler gear 7 and the intermediate gear 9. Optical sensors (not shown) are provided above and below the sensor gear 8. By detecting a change in the amount of light passing through the slit formed in the sensor gear 8 by this optical sensor, it is possible to detect whether or not the sensor gear 8 is rotating. The rotation from the idler gear 7 is transmitted to the intermediate gear 9.

The intermediate gear 9 is a gear for transmitting the rotation transmitted from the sensor gear 8 to the take-up reel 3. The intermediate gear 9 causes the take-up reel 3 and the capstan motor 4 to rotate in the same direction. As a result, when the take-up reel 3 rotates, the magnetic tape 1 can be normally rotated for reproduction and fast-forwarding. The rotation of the capstan motor 4 is transmitted to the rewind reel 2 or the take-up reel 3 by the above-described reel-driving torque transmission path, and the magnetic tape 1 is taken up or rewound.

<Structure of Take-up Reel Periphery> Around the take-up reel 3, a mechanism for stopping the take-up reel 3 is provided. Further, a magnetic tape guide, a tape loading mechanism, and the like, which are not shown, are also provided. The take-up reel 3 is a reel for taking up the magnetic tape 1 (not shown), and rotates clockwise during reproduction and fast-forwarding. A take-up reel gear 11 is provided around the take-up reel 3.

Around the take-up reel 3, the cam gear 1
2, a worm 13, an arm 14, a pinion 15, a mode switching lever 16, and a loading gear 17 are provided. The cam gear 12 is adjacent to the take-up reel 3 and is rotatably provided. A cam gear tooth portion 21 is provided around the cam gear 12. Cam gear 12
A partial gear 22 that can mesh with the take-up reel 3 is provided in a part of the upper part of the periphery of the. In addition, of the upper part of the periphery where the partial gear 22 is not provided,
4 is provided with a bevel gear 23. Further, a cam groove 24 is provided at the center of the upper surface of the cam gear 12. The positional relationship between the take-up reel 3 and the cam gear 12 is shown in FIG.

The worm 13 is provided adjacent to the cam gear 12 and meshes with the cam gear tooth portion 21. The worm 13 is provided with a pulley 25 at its end. The arm 14 moves a pinch roller (not shown) in contact with the magnetic tape 1. The arm 14 has a cam follower 26 that engages with the cam groove 24 at the end thereof. Therefore, when the cam gear 12 rotates, the cam follower 26 moves along the cam groove 24, and the arm 14 moves accordingly, so that the pinch roller moves to an appropriate position.

The pinion 15 is arranged below the cam gear 12 coaxially with the cam gear 12, and rotates in conjunction with the cam gear 12. The mode switching lever 16 is provided adjacent to the take-up reel 3 and the cam gear 12. Further, the mode switching lever 16 has a rack 18 that can mesh with the pinion 15. Mode switching lever 16
Can be moved in the direction of the arrow in FIG. 2, and the movement switches the playback mode (the position shown in FIG. 2A) to the stop mode. The mode switching lever 16 moves to the stop mode position to bring a brake pad (not shown) into contact with the take-up reel 3.

The loading gear 17 is provided above the cam gear 12 and meshes with the bevel gear 23 (FIG. 2).
(See (b)). The loading gear 17 is rotated to perform tape loading when the video cassette is inserted into the insertion port of the video cassette recorder. <Operation of the take-up reel> Next, the operation of the take-up reel 3 will be described.

When the take-up reel 3 rotates, the rotation of the capstan motor 4 is transmitted to the take-up reel gear 11 of the take-up reel 3. As a result, the take-up reel 3 rotates clockwise and the magnetic tape 1 can be reproduced or fast-forwarded. On the other hand, a case where the take-up reel 3 stops will be described.

First, as the worm 13 shown in FIG. 2 rotates, the cam gear 12 passes through the cam gear teeth 21.
The rotation is transmitted to the cam gear 12, and the cam gear 12 is rotated counterclockwise (see FIG. 2A). The pinion 15 rotates with the rotation of the cam gear 12. Pinion 15 and rack 1
2 and the mode switching lever 16 is moved to the position shown in FIG.
By moving in the direction of the arrow in (a), the mode is switched from the reproduction mode to the stop mode. As a result, a brake pad (not shown) comes into contact with the take-up reel 3 and tries to stop the take-up reel 3 by frictional force. At the same time, as the cam gear 12 rotates, the partial gear 22 moves to a position where it meshes with the take-up reel gear 11 (see FIG. 3). Partial gear 2 at the position where both gears mesh
When 2 stops rotating, rotation of the take-up reel 3 is hindered. That is, the take-up reel 3 is stopped by the brake pad and the partial gear 22. Therefore, the take-up reel 3 can be reliably stopped.

<Characteristics> In the conventional video cassette recorder, a brake pad is used as a stopping mechanism for the take-up reel 3. However, in the present embodiment, the take-up reel 3 can be surely stopped by the partial gear 22 together with the brake pad as the stop mechanism of the take-up reel 3.

The cam gear 12 has been provided in the past, and was used to move the arm 14, the mode switching lever 16 and the loading gear 17. That is, the stop mechanism of the take-up reel 3 can be made more reliable without adding another member. [Second Embodiment] FIG. 4 shows a rewind reel 2 and a cam gear 42 of a video cassette recorder according to a second embodiment of the present invention. The overall structure of the video cassette recorder is the same as that of the first embodiment, and will be omitted. The rewind reel 2 and the cam gear 42 are arranged symmetrically with the take-up reel 3 and the cam gear 12 used in the first embodiment.

<Structure> The rewinding reel 2 is a reel for rewinding the magnetic tape 1 and rotates counterclockwise at the time of rewinding. A rewind reel gear 41 is provided around the rewind reel 2. The cam gear 42 is adjacent to the rewind reel 2 and is rotatably provided. Similar to the cam gear 12, the cam gear 42 is provided with a cam gear tooth portion 51, a partial gear 52 that can mesh with the rewind reel 2, a bevel gear 53 that meshes with a loading gear (not shown), and a cam groove 54 around the cam gear 42. ing. The cam gear 42 is meshed with a worm (not shown) and the partial gear 52, and is rotated by the rotation of the worm.

<Operation of Rewinding Reel> The operation of the rewinding reel 2 will be described. The rewind reel 2 rotates counterclockwise when the rotation of the capstan motor 4 is transmitted to the rewind reel gear 41. As a result, the magnetic tape 1 can be rewound.

The rotation of the capstan motor 4 is selected and transmitted by the idler gear 7 from the take-up reel 1 and the rewind reel 2. Therefore, if an attempt is made to immediately enter the rewinding operation from the state in which the magnetic tape 1 is being regenerated by winding the take-up reel 1, the idler gear 7 is engaged from the take-up reel 3 side to the rewind reel 2 side. Need to be changed. However, while the engagement of the idler gear 7 is changed, both reels 1 and 2 are in a free state, and the magnetic tape 1 may be bent. When the magnetic tape 1 is bent, it may affect a video head for reproduction.

In order to avoid bending of the magnetic tape 1, in the present embodiment, the cam gear 42 is rotated so that the partial gear 52 and the rewind reel gear 41 are engaged with each other, and then the cam gear 42 is further rotated. This allows the cam gear 4
The torque due to the rotation of 2 is transmitted to the rewind reel 2,
The rewind reel 2 rotates in a direction in which tension is applied to the magnetic tape 1 (rewind direction). As a result, the magnetic tape 1
Can be suppressed.

<Characteristic> The conventional video cassette recorder is provided with a rewinding mechanism for suppressing the bending of the magnetic tape 1 when rewinding from the time of reproduction. But,
In the present embodiment, by using the cam gear 42 provided adjacent to the rewind reel 2 from the conventional mechanism, it is possible to omit the first return mechanism. This makes it possible to produce the video cassette recorder at a lower cost.

<Other Examples> The video cassette recorder of the second embodiment may be further provided with the take-up reel stop mechanism of the first embodiment.

[0033]

In the video cassette recorder according to the present invention, the rotating member is rotated to mesh the partial gear with the reel gear portion, thereby stopping the reel rotating body. By stopping the rotating member when the partial gear and the reel gear part mesh with each other, the reel can be reliably stopped. Since this rotating member is provided in the video cassette recorder for other purposes (for driving members), an additional member for the reel rotating body stopping mechanism is unnecessary. Therefore, it is possible to provide the reel rotating body stop mechanism in the video cassette recorder in a space-saving manner without changing the configuration.

[Brief description of drawings]

FIG. 1 is an overall view of a video cassette recorder.

FIG. 2 is a schematic diagram around a take-up reel of a video cassette recorder.

FIG. 3 is a schematic diagram of a take-up reel and a cam gear of a video cassette recorder.

FIG. 4 is a schematic diagram of a rewind reel and a cam gear of a video cassette recorder.

[Explanation of symbols]

1 Take-up reel 2 Take-up reel gear 3 cam gear 11 teeth 12 partial gears 41 Rewind reel 42 Rewind reel gear 43 Cam Gear 51 teeth 52 partial gear

Claims (4)

[Claims] 1. A reel rotating member having a reel driving gear for driving rotation formed on an outer peripheral portion thereof, on which a video cassette is mounted, and a rotating member for driving a member arranged near the reel rotating member. In a video cassette recorder in which the reel gear part and the outer peripheral part of the rotating member are arranged so as to partially overlap each other in the vertical direction, a part of the outer peripheral part of the upper surface of the rotating member can mesh with the reel gear part. A certain partial gear is provided, which locks the rotation of the reel rotating body when the reel gear part meshes with the partial gear, and the reel rotation part when the reel gear part and the partial gear are disengaged. A video cassette recorder characterized by allowing rotation of the body. 2. The rotating member has a gear portion for driving from the outside on an outer peripheral portion and a cam groove inside, and a part of an arm for driving a pinch roller is engaged with the cam groove. A video cassette recorder according to claim 1, which is compatible. 3. The video according to claim 1, wherein the rotating member has a pinion that rotates in conjunction with a lower surface, and a rack portion formed on a mode switching lever meshes with the pinion. Cassette recorder. 4. The reel rotating body is a rewinding reel, and the rotating member rotates the rewinding reel by a predetermined rotation angle by utilizing the meshing of the reel gear part and the partial gear, The video cassette recorder according to claim 1, which suppresses slack of the tape of the video cassette.