JPH0963161A - Brake device in vtr - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly release a brake on a take-up side or supply side reel without ejecting a cassette tape at the time of drawing and loading a magnetic tape from a reel on the opposite side to the usual side of drawing out the magnetic tape. SOLUTION: The brake device is equipped with a detector, a brake member 40, an engagement means 50, a relay gear 34, a releasing plate 42 and a releasing part 44, etc., and when it is detected that the magnetic tape is not wound around the usual reel of drawing out the magnetic tape, the relay gear 34 is rotationally driven to disengage the brake member 40 from the reel base 26. The releasing plate 42 is meshed with the relay gear 34, and an end part of this releasing plate 42 on the opposite side to the relay gear 34 is moved to slide in the direction of the brake member 40 by rotating the relay gear 34. The releasing part 44 for releasing the brake member 40 from its engagement with the reel base 26 by touching the brake member 40 is provided on an end part of this releasing plate 42.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake device for a VTR that quickly releases a brake on a take-up side reel or a supply side reel when a tape end or tape top tape is loaded on the VTR. .

[0002]

2. Description of the Related Art In a VTR, a tape is loaded by pulling out a magnetic tape from either a supply side reel or a take-up side reel. For example, when pulling out the magnetic tape from the take-up reel, apply a brake to the supply reel, pull out the magnetic tape from the take-up reel to load it, and eject the magnetic tape. Take it up on the take-up reel. As described above, since the magnetic tape is pulled out and taken up by the same reel, the position of the magnetic tape wound around the drum does not change even when the cassette tape is taken out and put in.

By the way, when loading, there is no problem if the take-up reel has a magnetic tape.
If all the magnetic tape is wound on the supply reel (when the magnetic tape is not wound on the take-up reel (in the case of tape top)), the magnetic tape cannot be pulled out from the take-up reel. It is necessary to release the brake on the supply side reel. As one of the brake releasing means, there is a means for providing a specific position (top position) for releasing the brake, and when the tape top is detected during loading, the mode is changed to that position and the brake is released.

That is, when the cassette tape is inserted into the VTR main body, in the case of the tape top, the tape top is detected and the loading is stopped. Then, the mode of the VTR main body shifts from the use position to the top position through the eject position, and the brake of the reel on the supply side is released. At the time of this transition, the cassette tape is ejected, and the ejected cassette tape is re-inserted. Since the brake is released, the magnetic tape is pulled out from the supply reel and loading is performed.

[0005]

As described above, when loading a cassette tape, in the case of a tape top in which the magnetic tape is not wound around the reel for pulling out the magnetic tape, the top position is detected after the tape top is detected. It takes a long time to load again after shifting to, releasing the brake. Also, since the cassette tape is ejected when moving to the top position, the user wonders what happened. Also, when the magnetic tape is pulled out from the supply reel and loaded, the same problem as described above occurs at the tape end. The present invention has been devised in view of the above circumstances, and an object of the present invention is to eject a cassette tape when the magnetic tape is usually pulled out from a reel on the side opposite to the side where the magnetic tape is pulled out and loaded. It is an object of the present invention to provide a brake device for a VTR that can quickly release the brake on the take-up side reel or the supply side reel.

[0006]

In order to achieve the above object, a braking device in a VTR according to the present invention draws out a magnetic tape from either one of a take-up side reel and a supply side reel and engages with the other reel. In a VTR that performs loading while braking the reel base, a detector that detects the presence or absence of the magnetic tape on the one reel before loading, and a detector that is provided near the reel base and is detachable from the reel base Brake member,
An engaging means for engaging the brake member with the reel base and a reel base opposite to the brake member with the reel base sandwiched are provided near the reel base, and are rotationally driven when running the magnetic tape. The relay gear is supported slidably between the brake member and the relay gear, and the end opposite to the relay gear slides toward the brake member by meshing with the relay gear and rotation of the relay gear. A detector and a release unit that is provided on the release plate and that releases the engagement of the brake member with the reel base by contacting the brake member when the release plate slides toward the brake member. Detects that the magnetic tape is not wound around the one reel, the relay gear is rotationally driven to release the engagement of the brake member with the reel base. Characterized in that it was.

Further, the present invention is characterized in that the relay gear is rotationally driven by a capstan motor. Further, the present invention is characterized in that the release plate is supported slidably and swingably, and a return plate is provided for swinging the release plate to release the meshing between the release plate and the relay gear. To do. Further, in the present invention, the engaging means is a tension coil spring, and when the brake member engages with the reel stand, the tension coil spring urges the brake member in a direction to engage the reel stand with the brake. When the member is not engaged with the reel base, the brake member is configured to be urged in a direction of separating from the reel base.

According to the present invention, the brake member is swingably provided so as to engage with the reel stand and swing to the other side so as to be separated from the reel stand.
It is characterized in that a brake rotating member for engaging a brake member in a swinging state separated from the reel stand to swing the brake member to be engaged with the reel stand is provided. Also,
The present invention is characterized in that the detector is an optical sensor including a light emitter and a light receiver.

According to the present invention, when it is detected by the detector that the magnetic tape is not wound around the reel from which the magnetic tape is normally pulled out, the relay gear is rotationally driven to brake through the release plate and the release portion. The member moves to disengage the reel mount. As a result, the magnetic tape is pulled out from the reel on the side opposite to the normal side and loading is performed. In this way, when loading the tape tape at the tape top or the tape end, the brake member is operated by using the relay gear that was not used at the time of loading, so that the cassette tape is not ejected. , The brake can be released quickly.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 7 is a schematic view showing a state immediately after inserting the cassette tape into the VTR main body, and FIG. 8 is a schematic view showing a state after completion of loading. 7 and 8
In the figure, 2 is a VTR main body, 4 is a cassette tape, 6 is a supply reel, 8 is a take-up reel, 10 is a magnetic tape, 12 is a drum, 14 is a tape guide, and 16 is a capstan. The VTR main body 2 has an optical sensor 180 as a detector 18 for detecting whether the inserted cassette tape 4 is a tape top or a tape end.
2 are provided.

The optical sensor 1802 comprises a light emitter 20 and a light receiver 22. The light emitter 20 is, as shown in FIG.
Immediately after inserting the cassette tape 4 into the TR main body 2, the cassette tape 4 is inserted into the center of the cassette tape 4, and light is emitted toward both sides of the cassette tape 4. The light receivers 22 are arranged outside both sides of the cassette tape 4 to which the light from the light emitter 20 is irradiated, and when the cassette tape 4 is at the tape top or the tape end, the light from the light emitter 20 is transparent. Reading tape and cassette tape 4
The light is received by the light receiver 22 through holes (not shown) on both sides of the cassette tape 4
Is the tape end or the tape top.

1 to 6 are configuration diagrams showing an example of a brake device according to the present invention. In this embodiment, a case where a brake device is provided on the reel stand on the supply reel side will be described. 1 to 6, 26 is a reel stand with which the supply reel 6 is engaged, 28 is a capstan motor, 30 is a belt, 32 is a relay pulley, 34 is a relay gear, and 36 is a swing gear. Sometimes, the power of the capstan motor 28 is the belt 30, the relay pulley 3
2, transmitted to the reel stand 26 via the relay gear 34 and the swing gear 36. The outer periphery of the reel base 26 is formed with teeth 2602, and a brake device 38 is provided near the reel base 26.

The brake device 38 includes a brake member 40 that can be engaged with and disengaged from the reel base 26, an engagement means 50 that engages the brake member 40 with the reel base 26, and a release plate 42 that meshes with the relay gear 34. The release plate 42 is provided with a release portion 44 and the like. The brake member 40 is formed in a dogleg shape, and is provided near the reel stand 26 on the opposite side of the relay gear 34 with the reel stand 26 interposed therebetween. The brake member 40 is swingably supported on the VTR main body 2 with the central portion as a fulcrum 4002 so as to engage with the reel stand 26, and swinging to the other side is swingably supported so as to be separated from the reel stand 26. ing. One end of the brake member 40 engages with (engages with) the tooth portion 2602 of the reel base 26.
It is formed on a hook portion 4004 that brakes the reel base 26. A first pin 46 and a second pin 48 that extend parallel to the axial direction of the reel base 26 are provided at the end of the brake member 40 on the opposite side to the hook portion 4004.

The brake member 40 is provided with a tension coil spring 5002 as the engaging means 50. Due to this tension coil spring 5002, the brake member 40 normally has one end (hook portion 4004) with respect to the rotation fulcrum 4002 on the reel stand. It is urged to be pulled toward the 26 side. As shown in FIG. 2, the tension coil spring 5002 causes the brake member 40 to rotate relative to the rotation fulcrum 4002 when the brake member 40 has one end thereof rocked to the side opposite to the reel base 26 side. The direction of the force changes in the swinging direction, and the brake member 40 is urged away from the reel base 26.

The release plate 42, as shown in FIGS.
The release plate 42 is formed to have a size that extends from the relay gear 34 to the brake member 40, and a long hole 4202 is formed in the release plate 42. The release plate 42 is swingable by a pin 4204 inserted into the long hole 4202 and the brake member 40.
And the relay gear 34 are slidably supported, and the pin 4204 is supported by the VTR main body 2. Release plate 42
Is provided with a tension coil spring 52, and the tension coil spring 52 biases the release plate 42 toward the brake member 40. One end (the end portion on the relay gear 34 side) of the release plate 42 is formed into an uneven meshing portion 4206 so as to mesh with the relay gear 34, and this meshing portion 4206 is the meshing portion 4206.
By driving the relay gear 34 by meshing with 4, the end of the release plate 42 opposite to the relay gear 34 slides toward the brake member 40. A release portion 44 is provided at the end of the release plate 42 opposite to the relay gear 34.

The releasing portion 44 is provided with a contact plate 4402 which is parallel to the axial direction of the reel base 26 and extends in a direction orthogonal to the sliding direction of the releasing plate 42. This contact plate 44
02, when the engagement portion 4206 of the release plate 42 meshes with the relay gear 34, the relay gear 34 is rotationally driven and the release plate 42 slides from the brake member 40 toward the relay gear 34, By contacting the first pin 46 and pushing the first pin 46 toward the relay gear 34, the brake member 40 swings clockwise in the illustrated example with the pivot fulcrum 4002 as a fulcrum, and the reel base of the brake member 40 26 is released (the hook portion 4004 is engaged with the tooth portion 2602), and further, as shown in FIG.
The brake member 40 is oscillated until the biasing force of the tension coil spring 5002 acts on the rotation fulcrum 4002 in the clockwise direction in the illustrated example.

The relay gear 34 is provided in the vicinity of the reel base 26 and is rotationally driven by the capstan motor 28 when the magnetic tape is running as described above. The capstan motor 28 is the optical sensor. When the tape top 1802 detects the tape top, it is appropriately driven. That is, when the optical sensor 1802 detects the tape top, the brake of the reel base 26 is released before loading.

A return plate 54 is provided near the other end of the release plate 42 as shown in FIGS. The return plate 54 is
It is rotatably supported with the shaft 5404 as a fulcrum, comes into contact with the protrusion 4208 at the other end of the release plate 42 at a predetermined position (a state in which it is biased to the left side in the illustrated example by the tension coil spring 52), and relays. In the illustrated example, the release plate 42 is swung clockwise so as to release the mesh with the gear 34.
The return plate 54 is provided with a guide member 5402 so that the release plate 42 slides and moves, so that the release plate 42 surely comes into contact with the protrusion 4206 of the release plate 42. The return plate 54 is shown in FIG.
Further, as shown in FIG. 4, the LS (linear skate) arm 56 is rotationally driven.

The LS arm 56 is rotatably supported about a shaft 5604 as a fulcrum, and drives an LS chassis (not shown) that moves the cassette tape 4 to a predetermined position when the cassette tape 4 is inserted into the VTR main body 2. The LS arm 56 is rotated,
The end 5602 of the LS arm 56 is the end 54 of the return plate 54.
By pressing 04, the return plate 54 rotates and the release plate 42
Is rotated and the meshing with the relay gear 34 is released. The LS chassis is a kind of base for loading and unloading the cassette tape 4.

Further, the VTR main body 2 is provided with a brake releasing member 58 and a brake rotating member 60, as shown in FIGS. These brake release members 58
The brake rotation member 60 is configured to be driven (moved) by a drive source that drives the LS chassis. As shown in FIG. 6, the brake releasing member 58, as shown in FIG.
8 moves rightward in the illustrated example so that the brake member 40 oscillates in a clockwise direction as appropriate, thereby separating the hook portion 4004 of the brake member 40 from the reel base 26 and releasing the brake of the reel base 26. To do. The movement of the brake release member 58 at this time is caused by the tension coil spring 5002.
The action direction of the force is within the range in which the brake member 40 is swung counterclockwise.

After the loading is completed, the brake rotating member 60 has the second direction of the brake member 40, as shown in FIG. 5, when the acting direction of the force of the tension coil spring 5002 is the direction of rotating the brake member 40 in the clockwise direction. In the illustrated example, the pin 48 moves so as to push the brake member 40 to the left so that the brake member 40 oscillates counterclockwise as appropriate, whereby the hook portion 4004 of the brake member 40 is engaged with the reel base 26 (mesh engagement). Brake) on the reel stand 26.

Next, the operation will be described. VTR body 2
When the cassette tape 4 is inserted in, the optical sensor 1802 detects whether or not the cassette tape 4 is the tape top. At this time, the brake device 38 is in a state as shown in FIG. For other than tape top, relay gear 34
Then, the cassette tape 4 is moved to a predetermined position by an LS chassis (not shown).
At this time, the LS arm 56 that drives the LS chassis rotates as shown in FIGS. This rotation causes the return plate 54 to rotate and the release plate 42 to swing, so that the engagement of the release plate 42 with the relay gear 34 is released, and normal tape running by the relay gear 34 becomes possible.

The magnetic tape 10 is wound around the drum 12 by the four tape guides 14 and the normal loading is performed. That is, the brake member 40 is engaged (engaged) with the reel base 26 of the supply reel 6 and the brake is applied, and the tape is not pulled out from the reel base 26 side. The magnetic tape 10 is pulled out from the take-up reel 8 and loaded.

When the magnetic tape 10 is run, as shown in FIG. 6, the brake release member 58 moves to the right and pushes the second pin 48 to rotate the brake member 40 clockwise as appropriate. The hook portion 4004 of the brake member 40 is separated from the reel base 26, and the brake of the reel base 26 is released. As a result, the rotation of the relay gear 34, which is necessary for running the tape, is not supported, and the reel base 26 can freely rotate. At this time, the acting direction of the force of the tension coil spring 5002 is the brake member 40.
Since it is within the range of swinging counterclockwise, when the brake release member 58 returns to the predetermined position, the brake member 40 also returns to the predetermined position (the brake is applied) to prevent the cassette tape 4 from popping out due to vibration or the like. You can

On the other hand, when the cassette tape 4 inserted in the VTR main body 2 is a tape top, the capstan motor 28 is appropriately driven and the relay gear 34 is rotationally driven. By driving the relay gear 34, as shown in FIG. 2, the release plate 42 meshing with the relay gear 34 is moved along the elongated hole,
It slides from the brake member 40 toward the relay gear 34, and the contact plate 4402 of the release plate 42 comes into contact with the first pin 46 of the brake member 40 and pushes it. As a result, the brake member 40 appropriately swings, the hook portion 4004 of the brake member 40 separates from the reel base 26, and the brake of the reel base 26 is released.

At this time, in the brake member 40, since the acting direction of the force of the tension coil spring 5002 is the clockwise rotation direction, even after the release plate 42 is pulled back to the predetermined position by the tension coil spring 5002, the reel base 26 is moved. The brakes to the reel stand 26 are still released.
Can rotate freely. As a result, when loading the cassette tape 4 on the tape top,
Before the loading operation, the capstan motor 28, which has not been used at the time of loading, is effectively used to swing the brake member 40 through the relay gear 34 and the release plate 42, so that the cassette tape 4 is The brake of the take-up side (or supply side) reel base 26 can be quickly released without being ejected.

After the brake is released, the release plate 42 is pulled back to a predetermined position by the tension coil spring 52,
The cassette tape 4 is moved to a predetermined position by an LS chassis (not shown), and the engagement of the release plate 42 with the relay gear 34 is also released, as shown in FIG. Then, loading is performed. At this time, even if the magnetic tape 10 is not wound around the take-up reel 8, the brake on the reel stand 26 of the supply reel 6 is released.
The magnetic tape 10 is pulled out from the supply reel 6 and loaded.

After the loading is completed, the brake rotating member 60 moves to the left in the illustrated example, and the brake member 40 is appropriately rotated counterclockwise as shown in FIG. The reel base 26 is engaged and the reel base 26 is braked. As a result, the brake member 40 again meshes with the reel base 26,
The cassette tape 4 is prevented from popping out due to vibration or the like.

Therefore, even if the magnetic tape 10 is not wound around the take-up reel 8 for pulling out the magnetic tape 10, the brake of the supply reel 6 on the opposite side is quickly released, that is, the tape top (or tape end). Even if is detected, the brake is released for a moment and the operation for releasing the brake is performed promptly, so that the cassette tape 4 is quickly ejected without being ejected. Further, even when the reel base 26 does not have a built-in torque limiter, the brake can be released quickly. That is, a method is proposed in which the brake is configured with a toggle structure and the brake is released by utilizing the rotation of the reel base 26. With this method, the reel base 26 of the type in which the torque limiter of the reel base 26 is not built in is proposed. This is because the brakes cannot be released.

Although the supply reel 6 is provided with the brake device 38 as described above, the brake device 38 of the present invention can be applied to the case where the take-up reel 8 is braked. You can
As a result, in the case of the tape end, the brake can be released quickly as in the above case.

[0031]

As is apparent from the above description, the brake device in the VTR according to the present invention is a reel stand for pulling out the magnetic tape from either the take-up side reel or the supply side reel and engaging the other reel. In a VTR in which loading is performed while the brake is applied, a detector that detects the presence or absence of the magnetic tape on the one reel before loading, and a brake member that is provided in the vicinity of the reel stand and is detachable from the reel stand And an engaging means for engaging the brake member with the reel base and a reel base provided on the opposite side of the reel base with the reel base sandwiched therebetween, and rotationally driven when the magnetic tape runs. Is supported slidably between the relay gear and the brake member and the relay gear, and meshes with the relay gear to rotate the relay gear. A release plate having an end opposite to the relay gear that slides in the direction of the brake member; and a release plate that is provided on the release plate and that contacts the brake member when the release plate slides in the direction of the brake member. And a release portion for releasing the engagement of the reel base with the reel base. When the detector detects that the magnetic tape is not wound around the reel base, the relay gear is rotationally driven to rotate the relay base of the brake member. Since it is configured to release the engagement with, the cassette tape is not ejected when the magnetic tape is usually pulled out from the reel on the side opposite to the side where the magnetic tape is pulled out and loaded.
The brake on the take-up side or the supply side reel can be quickly released, and the loading can be performed quickly.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an example of a braking device of the present invention before a cassette tape is inserted into a VTR main body.

FIG. 2 is a configuration diagram showing a state in which a relay gear is rotationally driven to release a brake in an example of a braking device of the present invention.

FIG. 3 is a configuration diagram showing a state before the LS arm is rotated in an example of the braking device of the present invention.

FIG. 4 is a configuration diagram showing a state in which an engagement between a relay gear and a release plate is released by rotating an LS arm in an example of a braking device of the present invention.

FIG. 5 is a configuration diagram showing a state in which, after the loading is completed, the brake member is rotated to engage the hook portion with the reel base in an example of the brake device of the present invention.

FIG. 6 is a configuration diagram showing a state in which tape running is performed in an example of a braking device of the present invention.

FIG. 7 is a schematic view showing a state immediately after inserting a cassette tape into a VTR main body.

FIG. 8 is a schematic diagram showing a state after completion of loading.

[Explanation of symbols]

 6 Supply reel 8 Take-up reel 10 Magnetic tape 18 Detector 26 Reel stand 34 Relay gear 40 Brake member 42 Release plate 44 Release part 50 Engaging means

Claims (6)

[Claims] 1. A VTR in which a magnetic tape is pulled out from either one of a take-up side reel and a supply side reel, and loading is performed while a brake is applied to a reel stand engaged with the other reel. A detector that detects the presence or absence of a magnetic tape on the reel, a brake member that is provided near the reel base and that can be engaged with and disengaged from the reel base, and an engagement means that engages the brake member with the reel base, A relay gear, which is provided in the vicinity of the reel stand on the opposite side of the brake member across the reel stand and is driven to rotate when running the magnetic tape, and slides between the brake member and the relay gear. It is movably supported, meshes with the relay gear, and the end of the side opposite to the relay gear slides toward the brake member due to the rotation of the relay gear. A detection plate, and a release unit that is provided on the release plate and that releases the engagement of the brake member with the reel base by contacting the brake member when the release plate slides in the brake member direction. The VTR is configured to release the engagement of the brake member with the reel base by rotationally driving the relay gear when it is detected that the magnetic tape is not wound around the one reel by the container. Brake equipment in. 2. The brake device in a VTR according to claim 1, wherein the relay gear is rotationally driven by a capstan motor. 3. The release plate is slidably supported and swingably supported, and a return plate is provided for swinging the release plate to release the mesh between the release plate and the relay gear.
Brake device in the described VTR. 4. The engagement means is a tension coil spring,
The tension coil spring urges the brake member in a direction to engage the reel base when the brake member engages with the reel base, and the brake coil reels when the brake member does not engage with the reel base. 2. The brake device for a VTR according to claim 1, wherein the braking device is configured to urge in a direction away from the base. 5. The brake member is swingably provided so as to engage with the reel stand by swinging to one side, and swing away from the reel stand by swinging to the other side, and swings away from the reel stand. 2. The brake device for a VTR according to claim 1, further comprising a brake rotating member that engages with the brake member in a moving state to swing the brake member to engage with the reel base. 6. The brake device in a VTR according to claim 1, wherein the detector is an optical sensor including a light emitter and a light receiver.