JPH0731379Y2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a magnetic recording / reproducing apparatus that quickly stops a running magnetic tape to reduce the amount of overrun of the tape.

[Prior Art] A magnetic recording / reproducing apparatus for a DAT (digital audio tape) or other magnetic tape has a pair of reels of a supply reel and a take-up reel, and a reproduction mode (PLAY) and a fast-forward mode ( FF) drives the take-up reel, and reverse playback mode (RE
V.PLAY) and rewind mode (REW) drive the supply reel. Here, the reverse playback mode is not a mode in which the magnetic tape is fed backwards to produce a sound, but a mode for reading the signal more accurately and stopping it at the beginning of the song than when fast-forwarding the magnetic tape. Is. Also, when entering the stop mode (STOP),
The brake mechanism brakes both the supply reel and the take-up reel to prevent magnetic tape overrun.

Also, in the playback mode and the reverse playback mode, when the magnetic tape is fed and the reel receives a rotation resistance more than a predetermined value, the reel clutch mechanism automatically disconnects the driving force of the reel. There is. That is, the reel clutch mechanism is configured to relatively rotatably connect the driven rotating body connected to the reel side and the driving rotating body connected to the drive motor side of the reel with a predetermined friction force. When a rotational resistance of a predetermined amount or more is applied to the body, slippage occurs between the driven rotary body and the drive rotary body, and the reel is prevented from rotating.

A swing center idler is used as a means for selectively transmitting the driving force of the drive motor to the supply reel side and the take-up reel side. This center idler selectively displaces the rotational force of the reel drive motor to the supply reel side and the take-up reel side by displacing in the left-right direction, and when it is held in the neutral position, it is applied to either reel side. It does not transmit the driving force.

By the way, in the conventional magnetic recording / reproducing apparatus, the brake mechanism on the supply reel side, the brake mechanism on the take-up reel side, and the center idler are operated using a slide cam.

FIG. 12 is a specific explanatory view of a conventional example, in which 100 is a slide cam, 110 is a supply reel, 120 is a take-up reel, 130 is a supply brake, 140 is a take-up brake, 150 is a supply clutch, and 160 is a supply clutch. Is a take-up clutch and 170 is a center idler.

The center idler 170 swings its head to the left and right around the center of rotation O1 with the state shown in the neutral state, and when the reel drive motor (not shown) rotates in one direction, the neck is automatically moved to the left. Shake to drive the supply reel 110 via the supply clutch 150, while when the reel drive motor rotates in the other direction, it automatically shakes its head to the right to take up the take-up reel 120 via the take-up clutch 160. Is designed to drive. Further, the supply brake 130 rotates left and right around the rotation center O2,
When turning to the right, as shown in the figure, the pawl 131 blocks the rotation of the driven rotary body 151 of the supply clutch 150 to brake the supply reel 110, while when turning to the left, the pawl 131 is released. The brake of the supply reel 110 is released. Similarly, take-up brake 140
Is rotated left and right about the rotation center O3, and when rotated rightward, as shown in the figure, the take-up clutch 120 is prevented from rotating by the pawl 141 to prevent the driven rotor 161 of the take-up clutch 160 from rotating. On the other hand, when turning to the left, the pawl 141 is released to release the braking of the take-up reel 120.

The slide cam 100 is configured to hold the center idler 170 in a neutral state and rotate the supply brake 130 and the take-up brake 140 as illustrated.

[Problems to be Solved by the Invention] As described above, in the conventional case, since the center idler is held in the neutral state by the slide cam or the brake mechanism of the supply reel and the take-up reel is operated, these The operation is unilaterally determined by the cam pattern of the slide cam.

Therefore, in the case of a device such as a DAT magnetic recording / reproducing device in which a magnetic tape is pulled out of a cassette to handle the magnetic tape in a complicated manner, it is difficult to perform fine control according to the handling. For example, when loading tape, brake one reel to feed the magnetic tape from the other reel, release the brakes on both reels when there is no more magnetic tape to feed, or brake one reel. If the magnetic tape is not wound on the other reel at the time of tape unloading when the magnetic tape should be wound on the other reel while applying the tape, reverse the relationship of the reels at that point and put it on the other reel. It was difficult to finely control the braking and winding the magnetic tape on one reel to eliminate the slack of the magnetic tape.

Moreover, since the slide cam is slid to the left and right by the rotational force of the loading motor decelerated by the deceleration mechanism, its movement takes time. Therefore, there is a problem that the magnetic tape largely overruns, for example, when the fast-forward mode of the magnetic tape is changed to the stop mode.

This invention solves such a problem.

[Means for Solving the Problems] In the magnetic recording / reproducing apparatus of the present invention, when the reel drive motor rotates in one direction, the reel drive motor is displaced in one direction to drive the supply reel via the supply clutch mechanism, and the drive is performed. A center idler that drives the take-up reel through a take-up clutch mechanism by displacing in the other direction when the motor rotates in the other direction, a supply brake mechanism that applies a braking force to the supply clutch mechanism, and the take-up clutch In a magnetic recording / reproducing apparatus having a take-up brake mechanism that applies a braking force to the mechanism, a brake brake is applied to the supply brake mechanism to release the brake operation, and a brake operation is performed to the take-up brake mechanism, and Take that releases the brake action An up brake solenoid, a first stopper pawl that is connected to the supply brake solenoid, and that prevents the center idler from displacing in one direction from the neutral position when the supply brake mechanism is braking. A second stopper claw that is connected to the take-up brake solenoid and that prevents the center idler from displacing in the other direction from the neutral position when the take-up brake mechanism is braking. At least one of the supply clutch mechanism and the take-up clutch mechanism includes a first clutch drum and a second clutch drum that rotate with a predetermined frictional force, and at least one of the supply brake mechanism and the take-up brake mechanism. The first Characterized by comprising a selection mechanism for selectively engaging the clutch drum to one or both of the second clutch drum.

[Operation] The magnetic recording / reproducing apparatus of the present invention quickly performs the function of holding the center idler in the neutral state, the function of operating the supply brake mechanism, and the function of operating the take-up brake mechanism by the two brake solenoids. And, especially, the overrun of the magnetic tape is suppressed to be small by the quick braking operation.

In the case of a device such as a DAT magnetic recording / reproducing device that draws out the magnetic tape from the cassette and handles the magnetic tape in a complicated manner, the two brake solenoids operate the supply brake mechanism and the take-up brake mechanism separately. By doing so, various controls according to the handling of the magnetic tape are realized.

Further, at least one of the supply clutch mechanism and the take-up clutch mechanism includes a first clutch drum and a second clutch drum that rotate with a predetermined frictional force, and at least one of the supply brake mechanism and the take-up brake mechanism is provided as a first clutch drum. By providing the selection mechanism that selectively engages one or both of the first clutch drum and the second clutch drum, for example, in the stop mode, at least one of the brake mechanisms is connected to both clutch drums by the selection mechanism. By engaging at the same time, the reel can be reliably stopped with a large reel torque via the clutch mechanism. Further, in the reproduction mode, the reel can be rotated with a predetermined frictional force by engaging the brake mechanism with only one clutch drum by the selection mechanism.

[Embodiment] As one embodiment of the present invention, a configuration example of a magnetic recording / reproducing apparatus for a DAT will be described below with reference to FIGS. 1 to 11.

FIG. 1 is a plan view showing the drive system in the stop mode, and FIG.
The figure is a side view of FIG. It should be noted that FIG. 2 does not show the side view of FIG. 1 as it is because it shows the vertical relationship. In these figures, 1 is a chassis, and on this chassis 1, a supply reel 10, a take-up reel 20, a supply clutch mechanism 30, a take-up clutch mechanism 40, a friction swing center idler 5
0, a supply brake mechanism 60, a take-up brake mechanism 70, and a slide cam selection mechanism 80 are provided.

The supply reel 10 is attached to the shaft 11 fixed on the chassis 1,
The reel pedestal 12 is rotatably attached, and a gear 13 is provided around the reel pedestal 12.
Further, a supply brake mechanism, which will be described later, is provided around the shaft 11.
60 is attached.

The take-up reel 20 is a shaft 21 fixed on the chassis 1.
In addition, the reel pedestal 22 is rotatably attached, and a gear 23 is provided around the reel pedestal 22. A take-up brake mechanism 70, which will be described later, is attached to the peripheral portion of the shaft 21.

The supply clutch mechanism 30 is interposed between the supply reel 10 and a center idler 50 described later,
It has the following structure (see Fig. 3). A shaft 31 fixed on the chassis 1 has a first gear 32, a first clutch drum 33, a second clutch drum 34, and a second gear.
35 are each rotatably mounted, and the central portion of the second gear 35 extends upwardly and is connected to the first gear 32. As a result, the first and second gears 32 and 35 are integrally combined to form a first rotating body. A gear having the same pitch as that of the second gear 35 and a large diameter is provided on the peripheral portion of the first clutch drum 33, and the lower peripheral portion of the first clutch drum 33 and the second clutch drum 34 are provided. A plurality of protrusions 33a, 34a are provided on the upper peripheral portion along the circumferential direction. A spring 36 is interposed between the first and second clutch drums 33 and 34, and the force of the spring 36 presses the first clutch drum 33 toward the first gear 32 side, and The second clutch drum 34 is pressed against the second gear 35 side. As a result, the first clutch drum 33 becomes a second rotating body that is connected to the first gear 32 with a predetermined frictional force, and similarly, the second clutch drum 34 has a predetermined frictional force. It is a third rotating body that is connected to the second gear 35. The former average distance r1 from the axes of the mutual contact surfaces is set larger than the average distance r2 from the axes of the latter mutual contact surfaces. Therefore, the first clutch drum 33
The reel torque Td required to rotate the first gear 32 when the second clutch drum 34 is stopped is larger than the reel torque Te required to rotate the second gear 35 when the second clutch drum 34 is stopped. Naturally, the reel torque when the first and second clutch drums 33 and 34 are simultaneously stopped is (Td + Te). First gear
32 is a gear 13 of the reel stand 12 of the supply reel 10.
Have been meshed with.

The take-up clutch mechanism 40 has the same configuration as the supply clutch mechanism 30 described above, and therefore description thereof will be omitted. In the figure, the portion corresponding to the shaft 31 of the supply clutch mechanism 30 is designated by the reference numeral 41, and the portion corresponding to the components 32, 33, ... 36 of the supply clutch mechanism 30 is designated by the reference numeral 42. , 43, …… 36 is attached.

As shown in FIG. 4, the friction swing center idler 50 is such that a center pulley 52 and an arm 53 are rotatably attached to a shaft 51 fixed on the chassis 1, and a center shaft 54 is attached to a shaft 54 at the tip of the arm 53. An idler 55 that meshes with the pulley 52 is rotatably attached. The arm 53 is pressed from above by a slide cam 80, which will be described later, and is vertically moved along the shaft 51 according to the slide of the slide cam 80. A spring 56 is attached between the center pulley 52 and the arm 53, and an idler is provided below the shaft 54.
A spring 57 that biases 55 upward is attached. Left and right claws 53a and 53b (see FIG. 2) related to a supply brake mechanism 60 and a take-up brake mechanism 70, which will be described later, are provided at the tip of the arm 53. A gear that meshes with the upper peripheral portion of the center pulley 52 is provided on the peripheral portion of the lower large diameter portion of the idler 55.
Gears with the same pitch are also provided on the upper small diameter portion of the.
Further, a belt 59 is stretched between the center pulley 52 and the capstan motor 58.

In the center idler 50 having such a structure, when the capstan motor 58 is normally rotated in the direction of arrow A1 in FIG. 1, the arm 53 swings in the direction of arrow B1 in FIG. 55 rotates in the direction of arrow C1 in the figure. When the capstan motor 58 reverses in the direction of arrow A2 in the figure, the arm 53 swings in the direction of arrow B2 in the figure due to friction, and the idler moves.
55 rotates in the direction of arrow C2 in the figure.

The supply brake mechanism 60 has a brake arm 61 formed by bending a plate member, and an intermediate portion of the brake arm 61 is rotatably attached to the shaft 11 of the supply reel 10 described above. One end of the brake arm 61 is
It is connected to a supply brake solenoid 62 attached to the chassis 1, and a spring 63 (see FIG. 1) is stretched between it and a fixed position on the chassis 1. The other end of the brake arm 61 is divided into upper and lower claws 61a and 61b, and the relatively long upper stopper claw (first stopper claw) 61a is the same as the left claw 53a of the arm 53 in the center idler 50 described above. The opposite, relatively short lower brake pawl 61b has the supply clutch mechanism 3 described above.
The protrusions 33a of the first and second clutch drums 33, 34 at 0
It faces the 34a.

The supply brake mechanism 60 having such a configuration performs the following two operations when the supply brake solenoid 62 is not energized during non-suction operation and when it is energized and suction operation is performed.

During non-suction operation As shown in FIGS. 1 and 2, the upper stopper claw
61a faces the claw 53a of the arm 53 to prevent the arm 53 from swinging in the direction of the arrow B2, and the lower brake claw
61b meshes with the protrusions 33a, 34a of the clutch drums 33, 34 to prevent the clutch drums 33, 34 from rotating.

When the suction operation is performed, the brake arm 61 rotates counterclockwise in FIG.
As shown in FIG. 6, the upper stopper claw 61a is attached to the arm 53.
The lower brake claw 61b separates from the protrusions 33a and 34a of the clutch drums 33 and 34, while separating from the first claw 53a.

Next, the take-up brake mechanism 70 has a brake arm 71 formed by bending a plate-shaped member, and an intermediate portion of the brake arm 71 is rotatable around the shaft 21 of the take-up reel 20 and vertically moved. It is movably attached.
One end of the brake arm 71 is connected to a take-up brake solenoid 72 attached to the chassis 1, and a spring is provided between the brake arm 71 and a fixed position on the chassis 1.
73 (see Fig. 1) is stretched. In addition, in order to bias the brake arm 71 upward, the take-up reel 20
A spring 74 is attached to the shaft 21 of the. The other end of the brake arm 71 has upper and lower claws 71a and 71b (see FIG. 1).
The upper stopper claw (second
71a is the center idler 5 described above.
The lower brake claw 71b, which is opposed to the right claw 53b of the arm 53 in 0 and is relatively short, is formed by the projection 4 of the first and second clutch drums 43, 44 of the take-up clutch 40 described above.
It faces 3a and 44a.

In the take-up brake mechanism 70 having such a structure, the brake arm 71 is vertically moved by the slide cam 80 described later. When the brake arm 71 moves up and the take-up brake solenoid 72 is not energized during non-suction operation, and when the brake arm 71 moves down and the take-up brake solenoid 72 is not energized during non-suction operation When the take-up brake solenoid 72 is energized to perform the suction operation regardless of the vertical movement of the brake arm 71, the following three operations are performed.

When the brake arm 71 is moving upward and is not sucking, as shown in FIG. 1 and FIG.
71a is opposed to the claw 53b of the arm 53 to prevent the arm 53 from swinging its head in the direction of arrow B1.
71b meshes with the protrusions 43a, 44a of the clutch drums 43, 44 to prevent the clutch drums 43, 44 from rotating.

When the brake arm 71 is moving downward and during non-suction operation, as shown in Figs. 10 and 11, the upper stopper claw
71a prevents the arm 53 from swinging in the direction of arrow B1, and the lower brake pawl 71b causes the protrusion 44a of the clutch drum 44 to move.
And the rotation of the clutch drum 44 is blocked.

When the suction operation is performed, the brake arm 61 rotates clockwise in FIG. 1 irrespective of the vertical movement of the brake arm 71, and the upper stopper claw 71a as shown in FIG. 6 and FIG. Arm 5
The lower brake claw 71b separates from the protrusions 43a and 44a of the clutch drums 43 and 44 while separating from the third claw 53b.

Next, the slide cam 80 is mounted between the shaft 11 of the supply reel 10 and the shaft 21 of the take-up reel 20 so as to be slidable in the left-right direction in FIG. The slide cam 80 is connected to a tape loading motor (not shown), and is slid to the left or right according to the operation mode at a speed at which the rotation of the loading motor is decelerated. That is, stop mode (STOP), playback mode (PL
AY), and reverse playback mode (REV.PLAY) slides to the right, and fast forward mode (FF) and rewind mode (REW) slides to the left. Below the slide cam 80, the first and second cam surfaces 80a, 80
b is formed, and the cam surfaces 80a and 80b move the brake arm 71 of the take-up brake mechanism 70 and the arm 53 of the center idler 50 up and down according to the slide of the slide cam 80 itself. Let

When the slide cam 80 slides to the right, the first cam surface 80a is separated from the brake arm 71 of the take-up brake mechanism 70 as shown in FIG. 2, and the brake arm 71 is held in the upper moving position. Also, the second cam surface
80b presses the arm 53 of the center idler 50 downward, as shown in FIG. 4, and holds the arm 53 in the down position.

When the slide cam 80 slides to the left, the first cam surface 80a presses the brake arm 71 of the take-up brake mechanism 70 downward as shown in FIG. 9 to hold the brake arm 71 in the down position. To do. Further, the second cam surface 80b is separated from the arm 53 of the center idler 50 as shown in FIG. 5, and the arm 53 is held at the upper moving position.

Next, the operation of the magnetic recording / reproducing apparatus of this embodiment will be described separately for each operation mode.

"Stop mode" In this stop mode, as shown in Figs. 1 and 2, the slide cam 80 slides to the right and both the supply brake solenoid 62 and the take-up brake solenoid 72 are in the non-suction operation state. Becomes

For this reason, the supply brake mechanism 60 and the take-up brake mechanism 70 are connected to the arrow of the arm 53 of the center idler 50.
Prevents swinging in the B1 and B2 directions and keeps it neutral. Therefore, the rotational force is not transmitted to both the supply clutch mechanism 30 and the take-up clutch mechanism 40. Further, the supply brake mechanism 60 simultaneously blocks the rotation of the first and second clutch drums 33, 34 of the supply clutch mechanism 30, and also takes up the brake system 70.
Prevents rotation of the first and second clutch drums 43, 44 of the take-up clutch mechanism 40 at the same time. Therefore, the supply clutch mechanism 30 and the take-up clutch mechanism
40 will stop the reel stands 12 and 22 with a large reel torque (Td + Te), respectively. This is extremely effective in suppressing the overrun amount of the magnetic tape to be small when the magnetic recording / reproducing apparatus enters the stop mode from another operation mode.

"Fast-forward mode" In this fast-forward mode, as shown in FIGS. 6 and 7, the slide cam 80 slides to the right, and the supply brake solenoid 62 and the take-up brake solenoid 72 both perform suction operation. , The capstan motor 58 (see FIG. 1) rotates forward in the direction of arrow A1.

Therefore, the arm 53 swings its head in the direction of arrow B1, the gear of the lower large diameter portion of the idler 55 rotating in the direction of arrow C1 meshes with the second gear 45 of the take-up clutch mechanism 40, and the second,
The first gears 45, 42 integrally rotate in the direction of arrow D1, and the reel base 22 of the take-up reel 20 rotates at high speed in the direction of arrow E1.

"Rewind Mode" In this rewind mode, only the capstan motor 58 (see FIG. 1) reverses in the direction of arrow A2 in the state of the fast-forward mode described above.

Therefore, the arm 53 swings in the direction of arrow B2 (see FIG. 1), and the gear of the lower large diameter portion of the idler 55 that rotates in the direction of arrow C2 in the figure is the second gear of the supply clutch mechanism 30.
The second and first gears 35, 32 mesh with 35, rotate integrally in the clockwise direction in the figure, and the reel stand 12 of the supply reel 10
Rotates at high speed counterclockwise in the figure.

[Reproduction Mode] In this reproduction mode, as shown in FIGS. 8 and 9, the slide cam 80 slides to the left, and the supply brake solenoid 62 and the take-up brake solenoid 72 both perform suction operation. , Capstan motor
58 (see Fig. 1) rotates forward in the direction of arrow A1.

Therefore, the gear of the upper small diameter portion of the idler 55 that rotates in the direction of arrow C1 and swings in the direction of arrow C1 as the arm 53 moves upward meshes with the gear of the first clutch drum 43 of the take-up clutch mechanism 40, The first gear 42 rotates together with the first clutch drum 43 in the arrow D1 direction, and the reel base 22 of the take-up reel 20 rotates at a low speed in the arrow E1 direction.
Since the first clutch drum 43 and the first gear 42 are connected with a predetermined frictional force, the take-up reel 20
When a reel torque Td of a predetermined value or more is applied to the take-up reel 20, the take-up reel 20 does not rotate because slippage occurs between the two.

Further, in this reproducing mode, a back tension mechanism (not shown) imparts a predetermined rotation resistance to the supply reel 10, whereby a predetermined back tension is applied to the magnetic tape.

"Temporary Stop Mode During Regeneration" In this temporary stop mode, both the supply brake solenoid 62 and the take-up brake solenoid 73 are in the non-suction operation state in the state of the above-described regeneration mode.

Therefore, the brake arm 61 of the supply brake mechanism 60
And the stopper claw 71a of the brake arm 71 of the take-up brake mechanism 70 cooperate to hold the arm 53 of the center idler 50 in a neutral state.
At the same time, the brake claw 61b of the brake arm 61 causes the first and second clutch drums 33, 3 of the supply clutch mechanism 30 to move.
4 rotation is prevented and the brake claw 7 of the brake arm 71 is
1b prevents the second clutch drum 44 of the take-up clutch mechanism 40 from rotating. Therefore, supply reel 10
Is applied with a brake torque (Td + Te), and the take-up reel 20 is applied with a brake torque Te. Although the brake torque applied to the take-up reel 20 is small, the tape overrun or slack does not occur because the magnetic tape feeding speed in the reproduction mode is small.

"Reverse play mode" In this reverse play mode, as shown in FIGS. 10 and 11, the slide cam 80 slides to the left, the supply brake solenoid 62 performs a suction operation, and the take-up brake solenoid 72 turns. The capstan motor 58 (see FIG. 1) reverses in the direction of arrow A2 as well as the inoperative state.

Therefore, the gear of the upper small diameter portion of the idler 55 that rotates in the direction of arrow C2 and swings in the direction of arrow C2 as the arm 53 moves upward meshes with the gear of the first clutch drum 33 of the supply clutch mechanism 30, The first gear 32 rotates in the direction of arrow F2 together with the clutch drum 33 of
The reel stand 12 of 10 rotates at a low speed in the direction of arrow G2. The first clutch drum 33 and the first gear 32 are connected to each other with a predetermined frictional force, and serve to wind up the magnetic tape fed from the capstan without slack.

Further, in the reverse rotation reproduction mode, the brake arm 71 of the take-up brake mechanism 70 moves downward, and the take-up brake solenoid 72 enters a non-suction operation state.
As described above, the brake claw 71 on the lower side of the brake arm 71
b prevents rotation of the second clutch drum 44 of the take-up clutch mechanism 40. The second clutch drum 44
Is coupled to the second gear 45 with a predetermined frictional force, so that the back tension corresponding to the reel torque Te is applied to the magnetic tape.

"Temporary stop mode during reverse rotation reproduction" In this temporary stop mode, both the supply brake solenoid 62 and the take-up brake solenoid 73 are in the non-suction operation state in the state of the reverse rotation reproduction mode described above.

Therefore, as in the stop mode during playback described above, the stopper claw of the brake arm 61 of the supply brake mechanism 60.
61a and the brake arm 7 of the take-up brake mechanism 70
Center idler 50
The arm 53 of the brake arm 61 is held in a neutral state, and at the same time, the brake claw 61b of the brake arm 61 is locked by the supply clutch mechanism
The rotation of the first and second clutch drums 33, 34 is blocked, and the brake claw 71b of the brake arm 71 blocks the rotation of the second clutch drum 44 of the take-up clutch mechanism 40. Therefore, the brake torque (Td + Te) is applied to the supply reel 10, and the brake torque Te is applied to the take-up reel 20. Further, although the brake torque applied to the take-up reel 20 is small, the tape overrun or slack does not occur because the magnetic tape feeding speed in the reverse reproduction mode is small.

"Tape unloading mode" In this mode, the capstan motor 58 (see FIG. 1) reverses from the state of the fast-forward mode of FIGS. 6 and 7 in the direction of arrow A2 to enter the rewind mode, The take-up brake solenoid 72 is in a non-suction state.

Therefore, the brake torque (Td
The magnetic tape pulled out while + Te) is applied to the supply reel 10 driven by the capstan motor 58.
Will be wound up.

As described above, it is possible to shift to various operation modes by the combination of the rotation of the capstan motor 58, the operations of the supply brake solenoid 62 and the take-up brake solenoid 72, and the slide of the slide cam 80. In that case, when the playback mode is switched to the fast-forward mode and when the reverse playback mode is switched to the rewind mode, the sliding operation of the slide cam 80 is slowed down by reducing the rotation of the loading motor. , Transition between other modes is done by two solenoids 62,72
And because it is performed by the fast operation of the capstan motor 58,
Performance that is comparable to the type in which the reel is directly driven by a direct motor can be exhibited.

[Effect of the Invention] As described above, the magnetic recording / reproducing apparatus of the present invention is
Since the function of holding the center idler in the neutral state, the function of operating the supply brake mechanism, and the function of operating the take-up brake mechanism are related to each other by the two brake solenoids, by the high-speed operation of the brake solenoid, These functions can be performed quickly, and in particular, the quick braking operation can suppress the overrun of the magnetic tape to be small.

In the case of a device such as a DAT magnetic recording / reproducing device that draws out the magnetic tape from the cassette and handles the magnetic tape in a complicated manner, the two brake solenoids operate the supply brake mechanism and the take-up brake mechanism separately. By doing so, various controls can be realized according to the handling of the magnetic tape.

Further, at least one of the supply clutch mechanism and the take-up clutch mechanism includes a first clutch drum and a second clutch drum that rotate with a predetermined frictional force, and at least one of the supply brake mechanism and the take-up brake mechanism is provided as a first clutch drum. By providing the selection mechanism that selectively engages one or both of the first clutch drum and the second clutch drum, for example, in the stop mode, at least one of the brake mechanisms is connected to both clutch drums by the selection mechanism. By engaging at the same time, the reel can be reliably stopped with a large reel torque via the clutch mechanism. Therefore,
The amount of overrun of the magnetic tape can be kept small. Further, in the reproduction mode, the reel can be rotated with a predetermined frictional force by engaging the brake mechanism with only one clutch drum by the selection mechanism. Therefore, it is possible to apply a constant back tension to the magnetic tape without separately providing a back tension mechanism.

[Brief description of drawings]

1 to 11 are views for explaining an embodiment of the present invention. FIG. 1 is a plan view of a main part in a stop mode, and FIG. 2 is a main part in a stop mode. Side view, Fig. 3 Vertical sectional view of supply clutch, Fig. 4 is a vertical sectional view of center idler when slide cam slides to the right, and Fig. 5 is center idler when slide cam slides to the left. 6 is a plan view of the main part in the fast-forward mode, FIG. 7 is a side view of the main part in the fast-forward mode, and FIG. 8 is a plan view of the main part in the playback mode. FIG. 9 is a side view of the main part in the reproduction mode, FIG. 10 is a plan view of the main part in the reverse reproduction mode, and FIG. 11 is a side view of the main part in the reverse reproduction mode. FIG. 12 is a side view of a main part for explaining a conventional example. 1 …… Chassis, 10 …… Supply reel, 20 …… Take-up reel, 30 …… Supply clutch mechanism, 31 ……
Shaft, 32 ... First gear (first rotating body), 33 ... First clutch drum (second rotating body), 34 ... Second clutch drum (third rotating body), 35 ...... Second gear (first rotating body), 40 ...... Take-up clutch mechanism, 58 …… Capstan motor (drive motor), 60 …… Supply brake mechanism, 61 …… Brake arm, 61a …… Stopper Claw (first stopper claw), 61b ... Brake claw, 70 ...
… Take-up brake mechanism, 71 …… Brake arm,
71a …… Stopper claw (second stopper claw), 71b ……
Brake arm claw.

Claims (1)

[Scope of utility model registration request] 1. A reel drive motor is displaced in one direction when rotated in one direction to drive a supply reel through a supply clutch mechanism, and is displaced in another direction when the drive motor is rotated in another direction. A center idler that drives the take-up reel via the take-up clutch mechanism, a supply brake mechanism that applies a braking force to the supply clutch mechanism, and a take-up brake mechanism that applies a braking force to the take-up clutch mechanism. In the magnetic recording / reproducing apparatus, a supply brake solenoid that brakes the supply brake mechanism and releases the brake operation; a take-up brake solenoid that brakes the take-up brake mechanism and releases the brake operation; Brae A first stopper pawl that is connected to a solenoid and prevents the center idler from displacing in one direction from a neutral position when the supply brake mechanism is braking, and is connected to the take-up brake solenoid, The supply clutch mechanism and the take-up clutch are provided with a second stopper pawl that prevents the center idler from displacing from the neutral position in the other direction when the take-up brake mechanism is braking. At least one of the mechanisms includes a first clutch drum and a second clutch drum that rotate with a predetermined frictional force, and at least one of the supply brake mechanism and the take-up brake mechanism includes the first clutch drum and the first clutch drum. One of the second clutch drums Other magnetic recording and reproducing apparatus characterized by comprising a selection mechanism for selectively engaging both.