JP3071054B2 - Drive mechanism for reel brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus and a reel for controlling the rotation of a magnetic tape take-up reel in a tape unwinding direction during a loading operation of a magnetic tape to maintain a stop position of the magnetic tape. The present invention relates to a brake driving mechanism.

[0002]

2. Description of the Related Art Among magnetic recording / reproducing apparatuses, there is a so-called 8-mm video as an apparatus using a magnetic tape. This 8
In millimeter video, a slide chassis can store and hold a cassette case around which a magnetic tape is wound.
Then, the slide chassis can be moved to a cassette attaching / detaching position where the slide chassis protrudes outward from the video main body by a built-in elevating mechanism to insert and remove the cassette case, and can be moved to a recording / reproducing position by a slide mechanism inside the video main body. At this recording / reproducing position, the magnetic tape in the cassette case can be pulled out and run to record or reproduce.

A loading mechanism for pulling out a magnetic tape from a cassette case and winding it around a rotary head drum is mounted in the 8-mm video apparatus. The loading mechanism operates as the slide chassis moves to the recording / reproducing position and performs tape loading. At least a pair of guide posts are movably provided on both sides of the rotary head drum. Draws out the magnetic tape in the cassette case and winds it around the rotary head drum at a predetermined angle.

When a cassette case around which a magnetic tape is wound is inserted into a cassette holder provided on a slide chassis in an ejected (cassette detachable) state and lowered, the slide chassis is moved to a recording / reproducing position in the video main body. Slide to. At this time, the magnetic tape in the cassette case is pulled out from the supply reel by the at least one pair of guide posts being moved by the loading mechanism, and is wound around the rotary head drum by a predetermined angle. And
In this state, when the recording or reproduction switch is turned on, the magnetic tape runs and recording or reproduction is performed.

When performing such tape loading, the magnetic tape pulled out from the cassette case is drawn out only from the supply reel, and is not drawn out from the take-up reel. This is to prevent re-recording on the recorded magnetic tape wound on the take-up reel. For this reason, a ratchet brake is provided on the take-up reel side to restrict the rotation of the take-up reel in the magnetic tape pull-out direction during loading.

On the other hand, when the magnetic tape in the cassette case is all wound on a take-up reel and the supply reel has no wound magnetic tape, the tape cannot be loaded and the magnetic tape is cut. There is a possibility that it will be. . In this case, a detector not shown in the related art detects a lead tape (transparent portion) at the end of the magnetic tape to confirm that there is no magnetic tape on the supply reel, releases the ratchet brake, and releases the magnetic tape on the take-up reel. It enables rotation in the unwinding direction. Therefore, even when there is no magnetic tape wound on the supply reel, the tape can be loaded by unwinding the magnetic tape from the take-up reel, and the magnetic tape is not cut. .

[0007] Such soft brakes and ratchet brakes are disclosed, for example, in Japanese Patent Application Laid-Open No. 62-234.
No. 288, or Japanese Utility Model Publication No. 1-35243.

[0008]

In the above-described conventional magnetic recording / reproducing apparatus, the slide mechanism and the loading mechanism are operated by a single drive motor, so that the capstan is driven and the magnetic tape travels. Is performed by a capstan motor. Further, as described above, the magnetic recording / reproducing apparatus is provided with the ratchet brake for restricting the rotation of the take-up reel in the magnetic tape pull-out direction during loading. The ratchet brake is normally urged by a spring to lock the latching pawl with the ratchet on the take-up reel side, thereby preventing the take-up reel from rotating in the tape pull-out direction. And
The ratchet brake is actuated against the urging force of the spring by the release lever, and the latch to the ratchet is released by the locking claw, thereby preventing the rotation of the take-up reel from rotating in the tape pull-out direction by the ratchet brake. It has become so. .

In this case, the operation of the release lever for releasing the ratchet brake is performed by a capstan motor. The drive transmission system of the capstan motor includes a capstan disposed coaxially with the drive shaft thereof, and a supply reel and winding for driving the magnetic tape traveling through a belt from a driven gear meshing with the drive gear of the capstan motor. There is already an idle gear that meshes with the gear that is integral with the take-up reel. Conventionally, a drive transmission system that drives and connects a release lever to the driven gear via one or more intermediate gears has been configured. However, the driven gear uses a soft material for noise reduction and is formed thin for miniaturization and weight reduction, and the meshing becomes unstable, so that the release lever cannot be reliably operated when necessary. was there.

Further, the capstan motor and the release lever of the ratchet brake are disposed at a very separated position, and it is difficult to form a drive transmission system between the two, and the structure becomes complicated. As a result, it is not preferable as a magnetic recording / reproducing apparatus that requires a reduction in size and weight.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a drive mechanism for a reel brake, which can reduce the size and weight of the apparatus and improve operability.

[0012]

According to the present invention, there is provided a reel brake driving mechanism for achieving the above object, wherein a slide chassis for supporting a cassette in a device is slidably supported on a base chassis. The base chassis and the slide chassis are connected by a drive arm, and the drive arm is driven by a rotatable cam gear.
By rotating the slide chassis between a cassette attaching / detaching position and a recording / reproducing position, the magnetic recording / reproducing apparatus is provided with a loading mechanism for winding a magnetic tape around a rotary head drum on the base chassis. A ratchet brake that locks to the rotating body on the magnetic tape take-up reel side during loading of the magnetic tape and regulates rotation of the take-up reel in the tape unwinding direction ;
A rotary drive for the magnetic tape supply reel and the take-up reel
The ratchet gear is driven by the rotational force of the drive pulley of the idle gear.
A release mechanism capable of releasing the rake restriction;
Interlock between the brake and release mechanism
And an operation control unit for controlling the operation .

[0013]

[Function] When loading magnetic tape, the operation control unit
As a result, the release mechanism becomes inoperative, and the ratchet brake is locked to the rotating body on the magnetic tape take-up reel side to prevent the take-up reel from rotating in the tape unwinding direction. Therefore, the magnetic tape is pulled out only from the supply reel and not from the take-up reel, thereby preventing erroneous recording on the recorded magnetic tape. At this time, if there is no magnetic tape wound on the supply reel, the operation control
The release mechanism is activated by the part, the driving force from the idle gear is transmitted to the ratchet brake, the release operation is performed, and the take-up reel can be rotated in the magnetic tape unwinding direction, so that the magnetic tape is released. The magnetic tape is prevented from being unwound from the take-up reel and cut.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a plan view of a slide chassis showing an unloading state in an 8 mm video provided with a reel brake driving mechanism according to an embodiment of the present invention, and FIG. 2 is a plan view of a slide chassis showing a loading state. FIG. 3 is a plan view of the base chassis showing an unloading state in the 8-mm video, FIG. 4 is a plan view of the base chassis showing the loading state, and FIG. 5 is a perspective view of the cassette holder.

In this embodiment, an explanation will be given using an 8 mm video as a magnetic recording / reproducing apparatus equipped with a drive mechanism for a reel brake. The cassette holder can be protruded outward from the video main body by the elevating mechanism, and the 8 mm video can be slid to the recording / reproducing position with respect to the base chassis of the video main body by being supported by the slide chassis. I have. In this embodiment, the front or the front is the side where the cassette case is inserted into the cassette holder, and the rear or the rear is the opposite.

First, the cassette holder and its elevating mechanism will be described with reference to FIG. In FIG. 1, various members related to driving of the magnetic tape mounted on the slide chassis are omitted.

As shown in FIG. 5, the magnetic tape 1 is housed in a box-shaped cassette case 2 wound around a supply reel 3 and a take-up reel 4. The magnetic tape 1 is exposed by opening the front lid 5 upward, and loading is possible. The cassette holder 11 has a box shape with front and rear openings, and a front portion (the left side in the figure).
The cassette case 2 can be inserted through an opening of the cassette case 2, and a stopper 12 for regulating the position of the inserted cassette case 2 is formed at the rear portion (right side in the figure). Further, supporting portions 13 and 14 for supporting the cassette case 2 are formed at lower portions on both sides of the cassette holder 11. On the other hand, the slide chassis 15 has a box shape with an open top, and the cassette holder 11 is supported by lifting mechanisms 16 and 17 provided on both left and right sides so as to be able to move up and down.

One lifting mechanism 16 has a connecting shaft 18 at an intermediate portion.
The arms 19, 20 are connected at their front ends to the cassette holder 11 and the slide chassis 15 by pivots 21, 22, and their rear ends are elongated holes 23, 24. And support shafts 25, 2
6, slide chassis 15 and cassette holder 1
Connected to 1. And a pair of arms 19, 20
A spring 27 is stretched between the arm 1 and the arm 1.
9 and 20 are urged in the upright direction. Since the other lifting mechanism 17 has substantially the same configuration as the one lifting mechanism 16, detailed description is omitted. Therefore, the cassette holder 11 can be moved up and down while maintaining a substantially horizontal state by the lifting mechanisms 16 and 17 on both sides.

The left and right elevating mechanisms 16 and 17 are operated at substantially the same speed on the cassette holder 11, that is, the elevating mechanisms 16 and 17 are operated.
A synchronizing mechanism for synchronizing 17 is provided. That is, racks 28 are respectively formed along the upper rear ends of the arms 20 of the elevating mechanisms 16 and 17, and a pinion 29 that meshes with each of the racks 28 is rotatably attached to the cassette holder 11 on its side. The pinions 29 are connected by a connecting rod 30 so as to rotate integrally.

Accordingly, when the cassette holder 11 is horizontally moved up and down by the elevating mechanisms 16 and 17, when the arms 20 are rotated, the pinions 29 are rotated via the racks 28, and the pinions 29 are connected by the connecting rods 30. As a result, the right and left elevating mechanisms 16 and 17 operate at substantially the same speed by rotating in synchronization with each other, and the cassette holder 11 is twisted during the elevating and lowering.
There is no slant.

In each of the left and right elevating mechanisms 16 and 17, a spring 27 is stretched on each of the arms 19 and 20, and an impact force or vibration is generated in the cassette holder 11 by the urging force. A damper mechanism 31 is provided for reducing vibration and operating slowly. Further, the elevating mechanism 17 is provided with a lock mechanism 32 for holding each arm in a tilted state, that is, a state in which the cassette holder 11 is lowered.

Next, a drive mechanism, a loading mechanism, a magnetic tape running mechanism, and the like of the slide chassis will be described with reference to FIGS. It should be noted that various members relating to the cassette holder mounted on the slide chassis are omitted in FIG.

As shown in FIGS. 1 and 3, the base chassis 41 is fixed in a not-shown 8 mm video main body in the form of a square plate, and has support pins 42, 43, 4 on all sides.
4, 45 are erected. On the other hand, slide chassis 1
The slide holes 5, 47, 48, and 49 are formed on each side in the front-rear direction (vertical direction in FIG. 3). Then, each support pin 42, 4 of the base chassis 41
The slide chassis 15 can move in the front-rear direction with respect to the base chassis 41 by engaging the slide holes 46, 47, 48, 49 of the slide chassis 15 with 3, 44, 45. .

A drive mechanism for the slide chassis 15 is provided on the base chassis 41. That is, a drive motor 51 having a drive gear 50 is mounted on the rear side of the base chassis 41, and the drive gear 50 meshes with the adjacent first connection gear 52. And the first
The connection gear 52 meshes with the adjacent second connection gear 53,
The third connection gear 54 coaxial with the second connection gear 53 meshes with the adjacent fourth connection gear 55, and the fifth connection gear 56 coaxial with the fourth connection gear 55 meshes with the adjacent sixth connection gear 57, The sixth connection gear 57 is adjacent to the seventh connection gear 5
8 and the seventh connection gear 58 is engaged with the cam gear 59. A first cam groove 60 is formed on the upper surface of the cam gear 59, while a second cam groove 60 is formed on the lower surface.
Are formed.

The cam gear 5 is provided on the base chassis 41.
A base end of the drive arm 62 is rotatably mounted at a position adjacent to the drive arm 9 by a pivot (support pin) 43, and a connecting shaft 63 is fixedly connected to the distal end. On the other hand, the slide bracket 15 has a support bracket 65 in which a connection groove 64 is formed.
Are mounted, and the drive arm 62 is
Are engaged with each other. Then, the drive arm 62
A cam shaft 66 is fixed to an intermediate portion of the cam gear 59. The cam shaft 66 is engaged with the first cam groove 60 of the cam gear 59.

Accordingly, when the driving motor 51 is driven, the driving force is transmitted to the driving gear 50 and the first connecting gear 5.
2, transmitted to the second connection gear 53, the third connection gear 54, the fourth connection gear 55, the fifth connection gear 56, the sixth connection gear 57, the seventh connection gear 58, and the cam gear 59,
9 can be rotated. And this cam gear 59
Is rotated by the first cam groove 60, the drive arm 62 is rotated about the pivot 43 via the cam shaft 66, and the slide chassis 15 is mounted on the base via the connection shaft 63 and the connection groove 64 (support bracket 65). It can move along the chassis 41.

The cam gear 5 is provided on the base chassis 41.
A connecting lever 67 is attached at a position adjacent to the drive arm 9 and opposite to the drive arm 62 by guide pins 68 and 69 so as to be movable in the longitudinal direction. A cam shaft 70 is fixedly connected to one end of the connecting lever 67.
0 is engaged with the second cam groove 61 of the cam gear 59.
On the other hand, a long hole 71 is formed at the other end of the connecting lever 67 and is connected to the operating lever 73 by a connecting pin 72. The operation lever 73 has a base end rotatably mounted on a pivot 74, and controls the operation of a pinch roller 127 (pinch arm 129) and a ratchet brake 150 (ratchet brake lever 153), which will be described later. .

The cam gear 59 has a lock control gear 7
5, and the lock control gear 75 is engaged with the release lever 76. Therefore, the lock control gear 7
The release lever 76 can be operated between the release position and the non-release position by the rotation angle of 5, so that the release of the lock mechanism 32 of the cassette holder 11 can be controlled.

Here, the loading mechanism of the magnetic tape 1 will be briefly described. The cam gear 59 has an intermediate gear 8
0, 81, 82 and 83 are sequentially meshed, and further, the first drive gear 84 and the second drive gear 85 are meshed. On the other hand, a rotary head drum 87 is mounted on the base chassis 41 at a substantially central portion via a drum base 86. A ring holder 88 is mounted on the base chassis 41 in close contact with the drum base 86, and two first ring gears 89 and a second ring gear 90 are vertically arranged on the lower surface of the ring holder 88. The first ring gear 89 is meshed with the first drive gear 84, and the second ring gear 90 is meshed with the second drive gear 85. Note that the cam gear 5
9. The intermediate gears 82 and 83 are partially missing gears.
The rotation of the cam gear 59, the transmission gear group on the drive source side, and the lock control gear 75 is allowed before and after the loading of the first and second ring gears 89 and 90 is completed.

Therefore, when the driving motor 51 is driven, the driving force is changed to the driving gear 50 and the connecting gears 52 to 52.
58, the cam gear 59, the intermediate gears 80 to 83, the first drive gear 84, and the second drive gear 85, and the first drive gear 84 and the second drive gear 85 rotate in different directions. Then, the first ring gear 89 and the second ring gear 89 that mesh with the first drive gear 84 and the second drive gear 85, respectively.
The ring gears 90 can rotate in mutually different directions.

Loading guide grooves 91 and 92 are formed on both sides of the rotary head drum 87 over both the drum base 86 and the ring holder 88. One loading guide groove 91 has a first guide base 93 movably mounted thereon.
On the guide base 93, a guide roller 94 and a guide post 95 are erected. And the first guide base 9
3 is a first ring gear 89 by a connecting lever (not shown).
It is connected to.

One end of the other loading guide groove 92 has a bifurcated shape, and a second guide base 96 is movably mounted. The second guide base 96 has a guide roller 97 and guide posts 98 and 99. Are respectively erected. The second guide base 96 is connected to the second ring gear 90 by a connecting lever (not shown). The impedance roller 100 is mounted on the ring holder 88 adjacent to the loading guide groove 91.

Accordingly, when the first ring gear 89 and the second ring gear 90 rotate in the opposite directions, the first guide base 93 can move along the loading guide groove 91, and the second guide base 96 can be loaded. The second guide base 96 can move along the guide groove 92, and rotates at a predetermined angle to be guided by the forked groove at one end of the loading guide groove 92.

Next, the magnetic tape traveling mechanism will be described. A capstan (shaft) 101 and a capstan motor 103 having a capstan gear 102 are mounted on the rear side of the base chassis 41, and the capstan gear 103 meshes with an adjacent gear pulley 104. On the other hand, the supply reel 3 is mounted on the slide chassis 15.
The turntable 105 on the side and the turntable 106 on the side of the take-up reel 4 are rotatably mounted at predetermined positions, respectively. Gear portions 107 and 108 are formed on the outer periphery of the turntable 105 on the supply reel 3 side and the turntable 106 on the take-up reel 4 side, respectively. The turntables 105, 1 are provided on the base chassis 41.
The gear pulley 109 is mounted between the gears 06 and the belt 110 is wound around the gear pulley 104, and the rotating shaft 111 of the gear pulley 109 passes through the elongated hole 112 of the slide chassis 15. Furthermore, the rotating shaft 1
11 has a bracket 11 at the top of the slide chassis 15.
3 is mounted on the bracket 113 and the gear pulley 1
The idle gear 114 that meshes with the idle gear 09 is mounted.
Note that a clutch member (not shown) that generates rotational friction is provided between the bracket 113 and the idle gear 114.

Accordingly, when the capstan motor 103 is driven, the capstan gear 102 is rotated, and the rotational force is generated by the gear pulley 104, the belt 110, and the gear pulley 10.
9, transmitted to the idle gear 114. At this time, if the transmitted torque is a clockwise rotation of the gear pulley 109, the idle gear 114 (bracket 113)
Is moved rightward about the rotation shaft 111 in FIG. 1 to move the gear portion 10 of the turntable 106 on the take-up reel side.
8 and the turntable 106 can be rotated clockwise (the feed direction of the magnetic tape 1) via the idle gear 114. If the transmitted torque is a counterclockwise rotation of the gear pulley 109, the idle gear 114 (bracket 113) is moved leftward about the rotation shaft 111 in FIG. Gear part 107 of table 105
And the turntable 105 can be rotated in the counterclockwise direction (rewind direction of the magnetic tape 1) via the idle gear 114. The above-mentioned clutch member generates the moving force of the idle gear 114.

A guide roller 116 and a guide post 117 for guiding the magnetic tape 1 at the time of loading are movably provided on one side (the left side in FIG. 1) of the slide chassis 15. That is, the slide chassis 15 has an intermediate portion between the two links 118 and 119,
Each link 118, 119 is rotatably mounted by being pivotally supported by an engaging pin 121.
22 and 123 penetrate through the guide hole 124 and engage with guide grooves 125 and 126 formed in the base chassis 41;
A guide roller 116 and a guide post 117 are attached to the other end, respectively.

Therefore, when the slide chassis 15 moves rearward (upward in FIG. 1), the engagement pins 122, 12
3 is restricted by the guide grooves 125 and 126, and the links 118 and 119 respectively rotate counterclockwise. When the links 118 and 119 are rotated by a predetermined amount, the engaging pins 122 and 123 are turned into the guide grooves 125 and 119, respectively.
By moving along 126, each link 118, 11
The guide roller 116 and the guide post 117 provided at the other end of 9 can move to a predetermined position through a predetermined trajectory.

The other side (the right side in FIG. 1) of the slide chassis 15 guides the magnetic tape 1 at the time of loading and guides the magnetic tape 1 with the capstan 101 when the magnetic tape 1 runs. A pinch roller 127 and a guide roller 128 are movably provided. That is, a pinch arm 129 having a pinch roller 127 mounted at one end thereof is rotatably mounted on the slide chassis 15 by a pivot 130, and a support arm 132 having a guide pin 131 mounted thereon is also provided with a pivot arm 13.
0 so that it is rotatable. A spring 133 is stretched between the arms 129 and 132 to urge the pinch arm 129 away from the support arm 132 in a clockwise direction in FIG. 1 and the support arm 132 from the counterclockwise direction in FIG. And the support arm 132
A spring 134 is wound around the pivot 130, and urges the support arm 132 counterclockwise in FIG.

On the other hand, a slide groove 135 is formed in the base chassis 41 along the moving direction of the slide chassis 15, and the pivot groove 13 of the pinch arm 129 penetrating the slide chassis 15 downward is formed in the slide groove 135.
0 is engaged. A guide groove 137 is formed in the base chassis 41, and a guide pin 131 of the support arm 132 that penetrates the arc-shaped through hole 136 of the slide chassis 15 is engaged with the guide groove 137. As described above, the operating lever 73 is rotatably attached to the base chassis 41 by the pivot 74.
8 are formed, and the guide pin 1 of the support arm 132 is formed.
31 can be engaged.

A guide arm 139 having a guide roller 128 mounted at one end thereof adjacent to the pinch arm 129 is rotatably mounted on the slide chassis 15 by a pivot 140. And this guide arm 1
An engagement pin 142 is attached to the other end of the base chassis 39, and the engagement pin 142 passes through an arc-shaped through hole 143 of the slide chassis 15 and engages with a guide groove 144 formed in the base chassis 41. I have.

Accordingly, when the slide chassis 15 moves rearward (upward in FIG. 1), the pinch arm 129 and the pivot 130 of the support arm 132 move along the slide groove 135 and the guide pin 1 of the support arm 132 moves.
31 is guided by the guide groove 137 and the pinch arm 129
And the support arm 132 rotates clockwise. Then, when the pinch arm 129 and the support arm 132 rotate by a predetermined amount, the guide pin 164 disengages from the guide groove 137 and fits into the engagement groove 138 of the operation lever 73. At this time, the operating lever 73 is rotated clockwise in FIG. 1 by the second cam groove 61 of the cam gear 59 via the connecting lever 67, so that the engaging groove 138 and the guide pin 1 are rotated.
31 and the support arm 132 and the pinch arm 129
Is rotated clockwise. In this manner, the pinch roller 127 can move to a position in contact with the capstan 101 via a predetermined trajectory.

When the pinch roller 127 moves, the engaging pin 142 of the guide arm 139 is
Guided by 44, the guide arm 139 can rotate clockwise and move to a predetermined position.

Here, the take-up reel 4 side and the supply reel 3
Various brake mechanisms provided on the side will be described.
As shown in FIG. 1, a ratchet brake 150 that regulates the rotation of the take-up reel 4 in the pull-out direction (counterclockwise in FIG. 1) of the magnetic tape 1 during loading is provided on the take-up reel 4 side. . That is, a ratchet 151 is formed on the outer periphery of the turntable 106 on the take-up reel side, while a pivot 152 is formed on the slide chassis 15.
As a result, a ratchet brake lever 153 is rotatably mounted. A locking claw 154 for locking the ratchet 151 is fixed to one end of the ratchet brake lever 153, and an engaging pin 155 is fixed to the other end. The ratchet brake lever 153 is urged by a spring 156 in either a clockwise direction or a counterclockwise direction around the neutral point in FIG.

On the other hand, a T-shaped switching lever 157 connected to the gear pulley 109 is rotatably mounted on the base chassis 41 by a pivot 158. One end of the switching lever 157 is a release that can be engaged with the gear pulley 109. The gear 159 is pivoted, and the release gear 15
9 is integrally formed with a cam 160. A pin 161 is fixed to the other end of the switching lever 157, and the pin 161 can be freely engaged with and disengaged from a notch 162 of the connecting lever 67 constituting an operation control unit . Further, a seesaw lever 163 is swingably supported adjacent to the release gear 159, and one end thereof can be engaged with the cam 160 of the release gear 159. Furthermore, this seesaw lever 1
A release lever 164 is rotatably attached by a pivot 165 adjacent to 63, one end of which is connected to the other end of the seesaw lever 163 by a connection pin 166, and the other end is connected to an engagement pin 155 of the ratchet brake lever 153. A mating engagement piece 167 is integrally formed. by the way,
The operating lever 73 has an operating piece 168 having a V-shaped groove into which the engaging pin 155 of the ratchet brake lever 153 can be inserted. That is, the switching lever 157
Lease gear 159, seesaw lever 163, release lever
164 and the like constitute a release mechanism.

Therefore, when the magnetic tape 1 is loaded, the ratchet brake lever 153 is held in a state where the locking claw 154 is locked to the ratchet 151 of the turntable 106 on the take-up reel side by the urging force of the spring 156. The rotation of the magnetic tape 1 in the pull-out direction (counterclockwise in FIG. 1) during loading on the take-up reel 4 is prevented. When the capstan motor 103 is driven to rotate the capstan gear 102, the driving force is transmitted to the gear pulley 104 and the belt 110.
To the gear pulley 109. At this time, the pin 161 of the switching lever 157 is
When the release gear 159 is engaged with the gear pulley 109 by rotating the switching lever 157 by engaging with the gear 62, the release gear 157 is rotated counterclockwise in FIG. can do. Then, the cam 16 of the release gear 159
0 causes the seesaw lever 163 to swing, the release lever 164 to rotate, and the engaging piece 167 to push the engaging pin 155 of the ratchet brake lever 153 to rotate the ratchet brake lever 153 counterclockwise in FIG. As a result, the locking to the ratchet 151 by the locking claw 154 is released, the restraint of the turntable 106 is released, and the take-up reel 4 becomes rotatable in the pull-out direction of the magnetic tape 1. When the pin 161 of the switching lever 157 is not engaged with the notch 162 of the connecting lever 67, the switching lever 157 does not rotate, so that the release gear 159 and the gear pulley 109 do not engage, and the ratchet brake 150 is not released. .

After the loading is completed, when the operating lever 73 is rotated clockwise about the pivot 74, the operating piece 168 pushes the engaging pin 155, and the ratchet brake lever 153 is rotated in the same manner as described above. By the movement, the restraint of the turntable 106 is released, and the take-up reel 4 becomes rotatable.

On the other hand, on the supply reel 3 side, a soft brake 171 for restricting the rotation of the magnetic tape supply reel 3 in the magnetic tape supply direction due to the inertia force when the magnetic tape 1 is loaded, and similarly in the magnetic tape supply direction when the loading is completed. A ratchet brake 172 for restricting the rotation is provided. That is, the soft brake lever 173 is rotatably attached to the slide chassis 15 by the pivot 174, and the turntable 10
A pressing member 175 that presses against the outer peripheral portion of No. 5 is mounted.

On the other hand, the ratchet brake lever 176 is also rotatably mounted on the slide chassis 15 by means of a pivot 174, and a locking claw 177 for locking with the gear portion 107 of the turntable 105 is integrally formed at its tip. ing. And the soft brake lever 17
A spring 178 is stretched between the brake lever 3 and the ratchet brake lever 176, and the soft brake lever 173 is turned clockwise in FIG. 1, that is, in a direction in which the pressing member 175 presses against the outer peripheral portion of the turntable 105, The ratchet brake lever 176 is turned counterclockwise, that is, the locking claw 177 is
7, respectively.

The soft brake lever 173 and the ratchet brake lever 176 have cam pins 1 respectively.
79 and 180 are fixed. On the other hand, the drive arm 62
The cam surface 1 that regulates the movement of each lever 173, 176
The cam gear 88 is formed with a cam groove 182 for controlling the operation of the ratchet brake lever 176.

Therefore, when the magnetic tape 1 is loaded, the soft brake lever 173 is urged clockwise by the urging force of the spring 178, so that the pressure contact member 175 presses against the turntable 105 on the supply reel side, and the magnetic tape The rotation of the supply reel 3 in the magnetic tape supply direction (clockwise in FIG. 1) due to the inertial force is prevented. Further, the ratchet brake lever 176 is held at that position by the cam surface 181 of the drive arm 62 abutting on the cam pin 180, and the locking claw 177 does not lock on the gear 107 of the turntable 105 on the supply reel side.
The rotation of the supply reel 4 during loading is not prevented.

In this state, when the slide chassis 15 is moved rearward (upward in FIG. 1) to perform loading, the drive arm 62 rotates counterclockwise in FIG. 1, and the cam pin 179 is moved by the cam surface 181. Then, the soft brake lever 173 is rotated counterclockwise against the urging force of the spring 178. Then, the pressing of the pressing member 175 against the turntable 105 is released, and the rotation regulation of the supply reel 3 is released. On the other hand, with this operation, the holding of the cam pin 180 by the cam surface 181 of the drive arm 62 is released, and the ratchet brake lever 170 is actuated by the urging force of the spring 178.
By locking the gear 77 on the gear portion 107 of the turntable 105, the rotation of the supply reel 3 in the magnetic tape supply direction is prevented when the loading is completed. After the loading is completed, when the cam gear 59 is further rotated, the cam groove 18 is rotated.
By rotating the ratchet brake lever 170 via the cam pin 180 by means of 2, the lock to the gear 107 by the locking claw 177 is released, and the rotation restriction of the supply reel 3 is released.

Hereinafter, the flow of the operation of storing the cassette 2 and loading the magnetic tape 1 and driving the magnetic tape 1 in the above described 8 mm video will be described.

When the cassette case 2 is mounted in the 8-mm video main body, as shown in FIG. 5, the cassette case 2 is inserted from the front into the cassette holder 11 at the raised position. Then, when the cassette holder 11 is pushed down from above from the eject (up) position, the elevating mechanism 1
The arms 19 and 20 of 6 and 17 are tilted, and the cassette holder 11 containing the cassette case 2 moves to the lower position. At this time, the cassette holder 11 (cassette case 2) is kept horizontal, and the left and right elevating mechanisms 16 and 17 are operated in anticipation, thereby preventing the cassette holder 11 from being twisted when the cassette holder 11 is lowered. Cassette holder 11
When the cassette holder 11 is lowered, the cassette holder 11 is restrained at the lowered position by the lock mechanism 32. When this is detected, the microcomputer drives the drive motor 51 via the motor drive circuit, and the slide on which the cassette holder 11 is supported. The base 15 starts moving.

When the cassette holder 11 is completely moved to the lowered position and restrained at the lowered position by the lock mechanism 32, the drive motor 51 is driven to drive the cassette holder 11
Slides the slide base 15 supported by. That is, as shown in FIGS. 1 and 3, when the driving motor 51 is driven, the driving force is transmitted to the driving gear 50 and the respective connecting gears 52.
５８58 to the cam gear 59, which rotates. Then, the drive arm 62 is rotated counterclockwise in FIG. 2 by the first cam groove 60 of the cam gear 59 via the cam shaft 66, and as shown in FIGS. 11 moves rearward (upward in the figure) along the base chassis 41 and stops at a predetermined position.

The magnetic tape 1 is loaded while the slide chassis 15 is slid by the drive motor 51. The eject (lower) position of the slide chassis 15 is in an unloading state of the magnetic tape 1, and the loading is performed by sliding the slide chassis 15 and pulling out the magnetic tape 1 from this state.

That is, as shown in FIGS. 2 and 4, when the drive motor 51 is driven, as described above, the cam gear 59 is driven.
Rotates, and the driving force is transmitted to the first drive gear 84 and the second drive gear 85, the first ring gear 89 and the second ring gear 90 are in different directions, and the first ring gear 89 is clockwise in FIG. Direction, the second ring gears 90 rotate counterclockwise, respectively. Then, the first guide base 93 moves along the loading guide groove 91, while the second guide base 96 moves along the loading guide groove 92.

Therefore, the magnetic tape 1 in the cassette case 2 is guided by the guide rollers 94 and the guide posts 95 of the first guide base 93 and the guide rollers 9 of the second guide base 96.
7 and the guide posts 98 and 99, and are brought into sliding contact with the outer peripheral surface of the rotary head drum 87.

The magnetic tape 1 is loaded by a plurality of guide rollers or guide posts on both sides of the rotary head drum 87 together with the loading by the movement of the first and second guide bases 93 and 96. That is, as shown in FIGS. 1 and 3, when the slide chassis 15 moves rearward at one side of the slide chassis 15, the pins 12 of the links 118 and 119 are moved.
2 and 123 move along the guide grooves 125 and 126, so that the links 118 and 119 respectively rotate.
As shown in FIG. 4, the guide roller 116 and the guide post 117 move to pull out the magnetic tape 1.

Further, on the other side of the slide chassis 15, when the slide chassis 15 moves rearward, the guide pin 131 of the support arm 132 is guided and moved by the guide groove 132, and the support arm 132 and the pinch arm 129 move. Rotate. When the support arm 132 rotates by a predetermined amount, the guide pin 131 is disengaged from the guide groove 132 and fitted into the engagement groove 138 of the operation lever 73. In this way, the pinch roller 127 moves and pulls out the magnetic tape 1, and when the pinch roller 127 moves, the guide arm 139 rotates, and the guide roller 128 guides the magnetic tape 1.

When the magnetic tape 1 is loaded, various kinds of brakes 150 and 50 are provided on the supply reel 3 and the take-up reel 4 of the cassette case 2 around which the magnetic tape 1 is wound.
171 and 172 are operating.

When the magnetic tape 1 is loaded, as shown in FIG. 1, the ratchet brake lever 153 on the take-up reel 4 has a locking claw 154 locked to the ratchet 151 of the turntable 106 on the take-up reel. And the pull-out direction of the magnetic tape 1 during loading on the take-up reel 4 (counterclockwise direction in FIG. 1).
Rotation is prevented. Therefore, the magnetic tape 1 is not pulled out from the take-up reel 4 during loading, and is prevented from being recorded again on the recorded magnetic tape 1 wound on the take-up reel 4.

When the magnetic tape 1 in the cassette case 2 inserted into the cassette holder 11 is entirely wound on the take-up reel 4 and the magnetic tape 1 is not wound on the supply reel 3, tape loading is performed. Cannot be performed, and the magnetic tape 1 is cut. In this case, the lead tape is detected by a detector (not shown), and the capstan motor 103 is driven from the state shown in FIG.
0, the release gear 159 is rotated via the gear pulley 109, the release lever 164 is rotated by the cam 160 via the seesaw lever 163, and the engagement piece 167 pushes the engagement pin 155 of the ratchet brake lever 153, thereby causing the ratchet brake. By rotating the lever 153, the lock is released, the restraint of the turntable 106 is released, and the take-up reel 4 becomes rotatable in the pull-out direction of the magnetic tape 1.

When loading the magnetic tape 1,
The soft brake lever 173 prevents the supply reel 3 from rotating in the magnetic tape supply direction due to the inertial force of the supply reel 3 when the pressure contact member 175 presses against the turntable 105 on the supply reel side. When the loading is completed, as shown in FIG. 2, the cam surface 181 of the drive arm 62 rotates the soft brake lever 173 via the cam pin 180, and the pressure contact of the pressure contact member 175 to the turntable 105 is released. The rotation restriction of the supply reel 3 is released.

On the other hand, when loading the magnetic tape 1,
As shown in FIG. 1, the ratchet brake lever 170 is held at that position by the cam surface 181 of the drive arm 62 abutting on the cam pin 180, and the locking claw 177 does not lock on the gear 107 of the turntable 105, The rotation of the supply reel 3 is not prevented. Then, when the loading is completed, as shown in FIG.
81, the holding of the cam pin 180 is released, and the ratchet brake lever 170 is locked by the locking claw 177 to the gear portion 107 of the turntable 105, so that the supply reel 3 is prevented from rotating in the magnetic tape supply direction.

As described above, the magnetic tape 1 is provided with the guide rollers 94, 97, 116, 128 and the guide post 9.
5, 98, 99, 117 and the pinch roller 127 are pulled out of the cassette case 2 and loaded on a predetermined locus. The loading state of the magnetic tape 1 shown in FIGS. 2 and 4 is a stop state in 8 mm video.

When the operator presses the play button from this state, the drive motor 62 is driven again, the cam gear 59 rotates, and the operating lever 73 is moved by the second cam groove 61 via the connecting lever 67 to the clock in FIG. Rotate in the direction of rotation. Then, the support arm 132 and the pinch arm 129 are rotated clockwise through the engagement groove 138 of the operation lever 73 and the guide pin 131. Therefore, the pinch roller 127 abuts on the capstan 101 and moves to a position sandwiching the magnetic tape 1 together with the capstan 101, and the drive motor 51 stops.

As described above, when the operating lever 73 rotates, the operating piece 168 pushes the engaging pin 155 to rotate the ratchet brake lever 153, thereby releasing the restraint of the turntable 106 and winding. The reel 4 becomes rotatable. Further, when the cam gear 59 rotates, the ratchet brake lever 176 is rotated via the cam pin 180 by the cam groove 182, whereby the locking of the locking portion 177 to the gear portion 107 is released, and the rotation of the supply reel 3 is restricted. Is released.

As described above, the supply reel 3 and the take-up reel 4
When the rotation restriction is released, the take-up reel 4 can be driven and rotated to run the magnetic tape. That is, when the capstan motor 103 is driven, the capstan gear 10
2 rotates and its rotational force is transmitted to the gear pulley 109 via the gear pulley 104 and the belt 110, and the gear pulley 109 rotates. Then, the idle gear 114
Rotates, and the bracket 113 rotates toward the take-up reel 4, and the idle gear 114 meshes with the gear portion 108 of the turntable 106 on the take-up reel. Therefore, the torque of the idle gear 114 is transmitted to the turntable 106, and the turntable 105 rotates clockwise. Then, the take-up reel 4 rotates in the same direction, and the magnetic tape 1 runs in the feed direction. Then, recording or reproduction can be performed as the magnetic tape 1 runs.

The running locus of the magnetic tape 1 is such that the magnetic tape 1 pulled out of the cassette case 2 is rotated by the rotary head drum 87 via the guide roller 116 and the guide post 117, the impedance roller 100, the guide roller 97, and the guide post 99. The guide post 95, 98, the guide roller 94, the capstan 10
1 (pinch roller 127) and guide roller 128, and again enters the cassette case 2.

When the recording or reproduction of the magnetic tape 1 is completed and the operator presses the stop button while the magnetic tape 1 is running, the capstan motor 103 stops, the rotation of the take-up reel 4 stops, and the drive is stopped. The motor 51 rotates in the opposite direction as described above, and the pinch rollers 127
Evacuate from 1. Further, the ratchet brake 151 restrains the take-up reel 4 to prevent rotation, and the ratchet brake 171 restrains the supply reel 4 to prevent rotation.

When the operator presses the eject button when the magnetic tape 1 is stopped, the drive motor 51 rotates in the reverse direction, the loading of the magnetic tape 1 is released, the magnetic tape 1 is returned into the cassette case 2, and the slide chassis 15 is moved forward. To the unloading state.

When the slide chassis 15 moves to the unloading position shown in FIGS.
Is released, the arms 19 and 20 of the lifting mechanisms 16 and 17 are erected by the urging force of the spring 27, and the cassette holder 11 is raised. When the cassette holder 11 is raised by the lifting mechanisms 16 and 17, the cassette holder 11 is raised by the urging force of the spring 27, but the operation is moderated by the action of the damper mechanism 31, and the impact and vibration when the cassette holder 11 is raised and lowered Is reduced and works slowly. And cassette holder 1
After the cassette 1 has been raised, the cassette case 2 can be taken out of the cassette holder 11.

[0074]

According to the reel brake driving mechanism of the present invention, as described in detail above with reference to the embodiments, in the magnetic recording / reproducing apparatus, the rotating body on the magnetic tape take-up reel side during loading of the magnetic tape is used. Ratchet brake that locks and restricts rotation of the take-up reel in the tape unwinding direction
And rotate the magnetic tape supply reel and the take-up reel.
Ratchet due to the rotational force of the drive pulley of the idle gear
A release mechanism that can release brake regulation is provided and activated
Control unit interlocks ratchet brake and release mechanism
Control of the ratchet brake
Can be controlled by the operation control unit, and the ratchet brake solution
The necessary driving force is obtained from the idle gear,
The structure of the drive transmission system is simplified, the size and weight of the device can be reduced, and the drive transmission capacity is also improved, and the operability is improved by reliably operating and releasing the ratchet brake when necessary. be able to.

[Brief description of the drawings]

FIG. 1 is a plan view of a slide chassis showing an unloading state in an 8 mm video provided with a reel brake driving mechanism according to an embodiment of the present invention.

FIG. 2 is a plan view of a slide chassis showing a loading state.

FIG. 3 is a plan view of a base chassis showing an unloading state in an 8 mm video.

FIG. 4 is a plan view of the base chassis showing a loading state.

FIG. 5 is a perspective view of a cassette holder.

[Explanation of symbols]

 Reference Signs List 1 magnetic tape 2 cassette case 3 supply reel 4 take-up reel 11 cassette holder 15 slide chassis 16, 17 elevating mechanism 41 base chassis 51 drive motor 59 cam gear 60, 61 cam groove 62 drive arm 73 operating lever 87 rotary head drum 101 capstan 103 Capstan motor 104 Gear pulley 109 Gear pulley (drive pulley) 105, 106 Turntable 110 Belt 114 Idle gear 127 Pinch roller 150 Ratchet brake 151 Ratchet 153 Ratchet brake lever 154 Locking claw 159 Release gear 163 Seesaw lever 164 Release lever

Claims (1)

(57) [Claims] A slide chassis that supports a cassette in an apparatus is slidably supported on a base chassis, and the base chassis and the slide chassis are connected by a drive arm, and the drive chassis is rotatable.
The slide arm can be moved between a cassette attaching / detaching position and a recording / reproducing position by rotating the drive arm by means of (a), and a loading mechanism for winding a magnetic tape around a rotary head drum is mounted on the base chassis. In the magnetic recording / reproducing apparatus, a ratchet brake that locks on a rotating body on a magnetic tape take-up reel side during loading of a magnetic tape to regulate rotation of the take-up reel in a tape unwinding direction, and a magnetic tape supply reel; roll
Of the idle gear drive pulley that drives the take-up reel to rotate.
A solution that can release the ratchet brake regulation by rolling force
Removing mechanism, the ratchet brake and the releasing mechanism,
And an operation control unit that controls the interlocking of the two
A drive mechanism for a reel brake, characterized in that it is eccentric .