JPH0444335B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reel drive device for winding a tape onto a reel in a magnetic recording/reproducing apparatus (hereinafter abbreviated as VTR) when the tape is unloaded from the reel.

Conventional reel drive devices of this type include two methods: one uses a dedicated motor for driving the reel, and the other uses power from another motor to drive the reel through a dedicated slip mechanism. The disadvantage is that the device is expensive because it requires dedicated equipment for the latter, and the latter also requires a dedicated slip mechanism and the switching mechanism of the transmission system is also complicated, making the overall mechanism of the device complicated. There are drawbacks.

SUMMARY OF THE INVENTION An object of the present invention is to provide a reel drive device for a magnetic recording/reproducing device that is simple in structure, economical, and has excellent performance, eliminating the drawbacks of the prior art described above.

The present invention provides a magnetic recording and reproducing apparatus that pulls out a magnetic tape stretched between a pair of reels and loads it onto a predetermined path, including a motor that can rotate in forward and reverse directions, and a motor that can be rotated in forward and reverse directions. A fixed shaft provided, a drive pulley rotatably provided around the fixed shaft, and a drive pulley rotatable around the fixed shaft and rotated by frictional force in the rotational direction of the drive pulley. an idler arm, an idler rotatably provided on the idler arm, rotatably connected to the drive pulley, and rotatably driving one of the pair of reels by selecting either a forward mode or a reverse mode; an input pulley to which the rotation of the motor is transmitted; a slip mechanism that rotates the input pulley at a predetermined tape constant speed; Alternatively, in a rewind mode, the drive pulley and the input pulley are engaged to directly switch and transmit the rotation of the belt pulley to the drive pulley, and in a playback or recording mode, the belt pulley is engaged with the slip mechanism. and a switching member that selectively transmits the rotation of the slip mechanism to the drive pulley.

Hereinafter, the present invention will be specifically explained with reference to embodiments illustrated in the drawings. FIG. 1 is a plan view of the entire VTR mechanism in a stop mode showing one embodiment of the present invention, and FIG. 2 is a back view thereof. In FIG. 1, the chassis 1 has a pair of reel shafts 2a and 3a.
are provided, and each reel stand 2, 3 can be rotated freely.
is installed. Reference numeral 4 denotes a motor that is capable of forward and reverse rotation and is attached to the chassis 1, and the output shaft 4 of the motor 4
A motor pulley 5 (shown in FIG. 2) is fixed to a, a capstan 6 is fixed to the motor pulley 5, and a belt 8 is stretched between the flywheel 7 which is rotatably attached to the chassis 1. ing.

9 is a sub-chassis 1a fixed to the chassis 1;
The fixed shaft shown above is a fixed shaft provided on the perpendicular bisector of the reel shafts 2a and 3a. As shown in detail in FIG. 1, a drive pulley 10 is rotatably provided on the fixed shaft 9, and a swinging idler arm 11 is also rotatably attached. The idler arm 11 has a shaft 11a.
is erected and rotatably supports the idler 12. The idler arm 11 and idler 12 are
As shown in FIG. 4, felt 13, spring 14,
By the spring seat 14 and the stopper 16, the arm 1
They are connected in such a way that the friction force necessary for swinging the head is obtained. Reference numeral 17 denotes a washer having an elongated hole 17a, and a spring 18 is attached to the hole 17b drilled at one end between it and the shaft 11a to constantly press the idler 12 to the drive pulley 10. The groove 9a also serves as a retaining ring for attaching the idler arm 11 to the fixed shaft 9. Here, the spring 18 has a pressing force sufficient to sufficiently transmit the rotational force of the drive pulley 10 to each of the reel stands 2 and 3 via the idler 12. In addition, Washiya 1
7 is a fixed shaft 9 related to the swinging motion of the arm 11.
Since the drive pulley 10 rotates around the idler 12, the state of pressure contact between the idler 12 and the drive pulley 10 is always maintained uniformly.

On the other hand, a belt pulley 19 is rotatably provided below the fixed shaft 9, and a belt 20 is stretched between the large diameter part of the belt pulley 19 and the motor pulley 5, and a sub-chassis is connected to the small diameter part of the belt pulley 19. 1a
A belt 23 is stretched between a gear pulley 24 rotatably provided on a shaft 21 provided above and a take-up pulley 22 rotatably supported by a hollow shaft portion 24a of a gear pulley 24. The gear pulley 24 and the take-up pulley 22 are a ready-made connection mechanism consisting of felt washers 25, 26, a pressure plate 27, a spring 28, and a stopper 29, so that a predetermined rotational force can be obtained.

Reference numeral 31 denotes a switching pulley that is rotatable around the fixed shaft 9 and movable up and down, and as shown in detail in FIG. Engagement teeth 3 that can be engaged with the inner circumferential rib portion 19a of the belt pulley 19 for rotational connection
1b, and a shaft 30a installed in the sub chassis 1a.
A gear portion 31c that can be engaged with an idler gear 30 that is rotatably provided is provided, and the idler gear 30 is always engaged with the gear portion 24b of the gear pulley 24.

In FIG. 4, the switching pulley 31 is connected to its gear portion 31c.
When the idler gear 30 is moving upward to the state where it is engaged, the engagement tooth 31b and the rib portion 19a of the belt pulley 19 are in a disengaged state, and conversely, as shown in FIG. When the gear portion 31b and the rib portion 19a are moving downward to engage with each other, the gear portion 3
The gear 1c is configured to be disengaged from the idler gear 30.

Further, as shown in FIG. 6, a cylindrical part 31d having a smaller diameter than both parts is formed between the arm part 31a and the gear part 31c of the switching pulley 31, and this cylindrical part 31d is made of elastic material such as plastic. C made of wood
A shaped ring 32 is fitted with a predetermined clearance in the radial and axial directions. This C-shaped ring 32 is provided with protrusions 32a and 32b on its sides, which fit into an oblong hole 33a of a switching arm 33 rotatably mounted around a pin 34 planted in the sub-chassis 1a. ing. A spring 36 is biased between the switching arm 33 and the sub-chassis 1a, and a counterclockwise rotational force is applied to the switching arm 33.
3b is connected to a plunger 35a of a solenoid 35 fixed to the subchassis 1a. On the other hand, when the solenoid 35 is not energized, the position of the switching arm 33 is determined by the spring 36 and the sub-chassis contact portion 33c, as shown in FIG. It is in a state of engagement. Furthermore, when the solenoid 35 is energized, the switching arm 33 is activated by the spring 36.
The engaging teeth 31b of the switching pulley 31 rotate clockwise against the force of
engages with the rib 19a of the belt pulley 19.

Next, configurations other than those described above will be briefly explained with reference to FIGS. 1 and 2. Reference numeral 37 denotes a loading motor that can rotate in forward and reverse directions, and when this motor rotates in one direction, the tape guide 41 is driven by a link mechanism driven by the output rotational force via a predetermined deceleration mechanism.
~44 is activated. 45 and 46 are stoppers for positioning these tape guides, and when the tape guides 41 to 44 move to this position, the tape 40a in the cassette 40 is moved to the rotating head cylinder 38.
at a predetermined angle, and at the same time fixed heads 47, 4.
8, forming a predetermined running route as shown in FIG. The crimping pinch roller 49 of the capstan 6 is operated by a pinch roller crimping link mechanism that is driven by the power of the motor 37 in the same way as the tape guides 41 to 44,
to the capstan 6. The pin 50 is mounted on a tension arm 51 that is rotatable around a shaft 51a on the chassis 1, and is a ready-made tension servo mechanism using a band brake 52 and a spring 53. The arm 51 is rotated counterclockwise so that the pin 50 comes into contact with the tape. brake arm 5
4 and 55 are respectively rotatably mounted on shafts 54a and 55a on the chassis 1, and springs 56 are stretched against each other to brake the reel stands 2 and 3. When driving the tape during rewinding or the like, a brake release means (not shown) is activated to rotate the brake arms 54 and 55 clockwise and counterclockwise, respectively, to release the brake.

Next, the operation will be explained. When the playback (or recording) operation button (not shown) is pressed from the stop mode shown in FIG. is canceled. At the same time, the loading motor 37 is driven, the tape 40a in the cassette 40 is pulled out by the tape guides 41 to 44, and the tape 40a is transferred to the rotating head cylinder 3.
8 at a predetermined angle, a predetermined travel path as shown in FIG. 7 is formed at the same time. At this time, the motor 4 is rotated clockwise in FIG. 1 and counterclockwise in FIG. 2, and the flywheel 7 is rotated by the belt 8.
Accordingly, the belt pulleys 19 are each transmitted and driven counterclockwise in FIG. 2 by the belt 20.
When the tape guides 41 to 44 reach the stoppers 45 and 46 to finish loading the tape, the pinch roller 49 pinches and presses the tape 40a against the capstan 6 and drives it in the direction of the arrow. After the pinch roller 49 is pressed, the motor 37 stops rotating by switching a limiter switch (not shown).

On the other hand, in FIG. 4, the rotational force of the belt pulley 19 is transmitted to the take-up pulley 22 by the belt 23, and this rotational force is transmitted to the felt washers 25, 26,
Friction is transmitted to the gear pulley 24 by a coupling mechanism consisting of a pressure bonding plate 27, a spring 28, and a stopper 29, and this rotational force is transmitted to a switching pulley 31 by an idler gear 30 that meshes with the gear portion 24b. Therefore, as shown in FIG. 3, the switching pulley 31 and the driving pulley 10 that are always engaged with the switching pulley 31 are rotated clockwise, and the idler arm 11 is also rotated clockwise at the same time due to the frictional rotational force of the felt washer 13 and the spring 14. Eventually, the idler 12 moves to the reel stand 3.
When the idler 12 comes into contact with the outer periphery of the reel stand 3
Start turning clockwise. At this time, the rotational force supplied to the reel stand 3 is set in advance to a required value, and the tape 40a fed at a constant speed by the capstan 6 and pinch roller 49 is moved by the take-up pulley 23 and felt washers 25 and 26. Wind up while constantly slipping. In this way, reproduction or recording, which is constant speed drive in the forward direction, is performed. At this time, an appropriate back tension is applied to the reel stand 2 by a tension servo mechanism including a tension arm 51 and the like.

Next, constant speed drive by the capstan 6 in the reverse direction will be explained. The operations from the stop mode to the tape loading and pinch roller pressing shown in FIG. 7 are performed in exactly the same way, except that the rotation of the motor 4 is reversed and is driven clockwise in FIG. 2. Therefore, the flywheel 7 and the belt pulley 19 are driven clockwise in FIG. 2 by the belts 8 and 20, respectively. On the other hand, in the driving pulley 10, the rotational force of the belt pulley 19 is applied to the belt 23, the winding pulley 22,
The signal is transmitted through the gear pulley 24, idler gear 30, and switching pulley 31 and rotates counterclockwise in FIG. 1, so the idler arm 11 rotates counterclockwise and drives the reel stand 2 counterclockwise.
Therefore, the tape 40a is driven in the reverse direction by the capstan 6 and the pinch roller 49,
The tape is wound onto the reel stand 2 and reproduced (recorded) in the reverse direction.

Next, the operation when a stop operation is performed in the playback (recording) mode will be described. First, the loading motor 37 is driven to rotate in the opposite direction to that during loading, the pinch roller 49 is released from pressure, and the tape guides 41 to 44 are eventually retreated.
At this time, almost simultaneously, the motor 4 is driven to rotate clockwise in FIG. 2, and the reel stand 2 is driven via the slip mechanism in exactly the same path as when reproducing (recording) in the reverse direction. Therefore, when the tape guides 41 to 44 return to the cassette 40 after all the tape slackened by the retreat of the tape guides is wound up into the cassette, a limiter switch (not shown) is activated to stop the motors 37 and 4. The drive is stopped. At this time, the brake release means also returns,
The reel stands 2 and 3 each have a brake arm 54,
55 and spring 56 to enter the stop mode.

Next, fast forwarding and rewinding will be explained. 1st
When the fast forward mode operation button (not shown) is operated from the state of , the brake release means is activated.
The braking by the brake arms 54 and 55 of the reel stands 2 and 3 is released. At the same time, the motor 4 is rotated counterclockwise as shown in FIG. 2, the solenoid 35 is energized as shown in FIG.
is rotated clockwise around the . At this time, the belt pulley 19 rotates counterclockwise in FIG. engage. Therefore, the rotational force of the motor 4 is applied to the belt 20,
Via the belt pulley 19 and switching pulley 31,
Since the drive pulley 10 is rotated clockwise in FIG. 3, the reel stand 3 is rotated at high speed via the idler 12. This reel stand drive is configured in advance so that a predetermined rotational force and rotational speed are transmitted without using a slip mechanism. Further, when a stop operation is performed in this mode, the rotation of the motor 4 is stopped and the brake release means is reset, so that the reel stands 2 and 3 are braked and the tape stops. At this time, the magnetic excitation of the solenoid 35 is released, and the switching arm 33 is returned to its original state by the spring 36, returning to the state shown in FIG. 4.
Next, when the rewind mode operation button (not shown) is operated from the state shown in FIG.
The solenoid 35 is energized and takes the transmission path shown in FIG. Moreover, since the motor 4 is rotated clockwise in FIG. 2, the drive pulley 10 is rotated counterclockwise in FIG. 1, and the idler 12 drives the reel stand 2 to rotate at high speed. Note that if you perform a stop operation in this mode, the rotation of the motor 4 will stop, and the reel stand 2,
3 acts to stop the tape, and the reel drive transmission system returns to the state shown in FIG. 4.

As explained above, the present invention uses a drive pulley rotatably connected to an idler that drives a pair of reels as an output member of a switching means in either fast-forward or rewind mode, playback or recording mode, and rotates the motor. is transmitted through a belt as an input member for mode switching in either fast forward or rewind mode, playback or recording mode, and this input member and the output member are on the same first fixed shaft. In the fast forward or rewind mode, the drive member is fixed to the first fixed shaft and is placed between the belt pulley, which is the input member, and the drive pulley, which is the output member, on this fixed shaft, and is slid on the first fixed shaft. The rotation of the belt pulley is directly transmitted to the drive pulley, and in the playback or recording mode, the output portion of the slip mechanism provided on the second fixed shaft separated from the first fixed shaft is rotated to the drive pulley.

In this way, the present invention is such that the drive pulley rotatably connected to the idler that drives the pair of reels is on the first fixed shaft, and the shaft remains fixed even in fast forward or reverse mode, playback or recording mode. Since they do not shift in the same position, the rotational power can be switched reliably.

Further, in the present invention, the slip mechanism that rotates while slipping while rotating the tape at a predetermined constant speed is located on a second fixed shaft separated from the first fixed shaft, and forms a second transmission path exclusively for constant speed feeding; Since it is separate from the first transmission path dedicated to high-speed feed on the first fixed shaft, the rotational speed ratio from the belt pulley to the drive pulley can be adjusted to
Values suitable for each mode can be easily selected, and the slip rate can be set to the minimum necessary for the path through the slip mechanism in recording or playback mode, taking into account the reliability of the slip mechanism. There is an effect.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a VTR mechanism (stop mode) using an embodiment of the present invention, FIG. 2 is a back view thereof, and FIG. 3 is a plan view showing details of the reel drive unit in FIG. 1. Figure 4 is a side sectional view of Figure 3 (playback, recording mode), Figure 5 is a side sectional view of Figure 3 (fast forward, rewind mode), Figure 6 is the rotational force transmission path switching of Figure 4. FIG. 7, which is a detailed view of the mechanism, is a plan view showing a state in which the stop mode shown in FIG. 1 is switched to the playback (recording) mode. 2, 3...Reel stand, 4...Motor, 5...Motor pulley, 6...Capstan, 9...Fixed shaft, 10...Drive pulley, 11...Idler arm, 12...Idler, 19...Belt pulley,
24... Gear pulley, 30... Idler gear, 3
1...Switching pulley, 40a...Magnetic tape.

Claims (1)

[Claims] 1. In a magnetic recording and reproducing device of a type in which a magnetic tape stretched between a pair of reels is pulled out and loaded onto a predetermined path, a motor capable of forward and reverse rotation and a motor installed on the perpendicular bisector of the pair of reels are provided. 1st
a fixed shaft; a drive pulley rotatable about the first fixed shaft; and a drive pulley rotatable about the first fixed shaft and rotated by frictional force in the rotational direction of the drive pulley. an idler arm rotatably provided on the idler arm and rotationally connected to the drive pulley, the idler rotationally driving one of the pair of reels depending on the rotational direction of the drive pulley; and the motor. a belt pulley to which the rotation of the belt is transmitted, and a second fixed shaft separate from the first fixed shaft, which is rotatable about the belt pulley, and the belt pulley rotates while slipping at a predetermined tape constant speed. A slip mechanism that
The belt pulley slides between the belt pulley on the first fixed shaft and the driving pulley depending on fast forwarding or rewinding mode, playback or recording mode, and engages with the belt pulley and the driving pulley in fast forwarding or rewinding mode. and separates from the output part of the slip mechanism to directly switch and transmit the rotation of the belt pulley to the drive pulley, and separates from the belt pulley and engages with the output part of the slip mechanism and the drive pulley in the playback or recording mode. 1. A reel drive device for a magnetic recording and reproducing device, comprising: a switching member that selectively transmits the rotation of the slip mechanism to the drive pulley.