JPH03254457A - Reel driver for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent an excess tension from being exerted to a tape by braking a reel base driven by a motor, absorbing a torque in the inside of the reel base and changing the direction of rotation of a capstan motor after loading. CONSTITUTION:One-way clutches 16, 17 are arranged on the way of delivering a torque from a capstan motor 2a to a reel and a slip mechanism is provided to reel bases 13, 14. Then a brake 18 is applied to either the supply reel base 14 or the winding reel base 13 at loading and unloading and the capstan motor 2a is driven in a direction to drive the reel base 14 or 13 subject to braking (18). Moreover, the torque is absorbed by a slip mechanism to change the drive direction of the capstan motor 2a after loading. Thus, the tape is driven in both the forward/reverse direction and excess tension exerted tot he tape at loading resulting in making a damage at loading is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reel drive device for a magnetic recording/reproducing device that records or reproduces signals on a magnetic tape.

[Conventional technology]

FIGS. 9 to 11 are diagrams showing a conventional reel drive device disclosed in, for example, Japanese Unexamined Patent Publication No. 64-88755,
In the figure, l is a first gear that is engaged with the capstan motor 2 and a gear 3 and rotates integrally with the capstan motor 2, and the first gear l is coaxial with the shaft U and is independent of each other. 5.6.7 8 gears rotatably arranged
It meshes with the gear 6 located in the middle. 13a, 14
& are gears formed integrally with the take-up reel stand and the supply reel stand 14, respectively, and mesh with the gears 5 and 7, respectively. As shown in FIG. 11, one of the opposing surfaces of the gears 6 has an annular serrated projection 8, and the other surface has the serrated projection 8 at the tip.
A leaf spring 9 that abuts is fixed. Further, on one of the opposing surfaces of the gears 6 and 7, a serrated projection 0 is provided in an annular shape in the opposite direction to the serrated projection 8.
A leaf spring U is provided on the other surface in a direction opposite to that of the leaf spring 9. Therefore, only when the gear 6 rotates in the direction B, a driving force is applied to the gear 5, and the gear 7 can freely rotate in the B direction. Further, when the gear 6 rotates in the direction B, a driving force is applied only to the gear 7, and the gear 5 is rotatable in both directions.

Next, the operation will be explained. In the forward feeding state in which the magnetic tape n is moved from the supply reel to the take-up reel, the capstan motor 2a rotates as shown in the figure, and this rotational force is transmitted to the gear 6 via the gears 3 and 1. Ru. At this time, since the gear 6 rotates in the 0 direction in FIG. 9, rotational force is transmitted only to the gear 5 by the action of the leaf spring 9, and the gear 13& rotates in the 0 direction in FIG. Since the rotational force is not transmitted to the gear 7 and therefore the gear 14&, the magnetic tape is wound up by the take-up reel stand rib.

Next, in the reverse direction feeding state in which the magnetic tape n is moved from the take-up reel to the supply IJ-ru, the capstan motor 2
a rotates in direction B in the figure, and this rotational force is applied to gear 3 and gear 1.
is transmitted to gear 6 via. At this time, since the gear 6 rotates in the 0 direction in FIG. 9, rotational force is transmitted only to the gear 7 by the action of the leaf spring 11, and the gear 14a rotates in the 0 direction in FIG. Further, since the rotational force of the gear 6 is not transmitted to the gear 5 and therefore to the gear shaft, the magnetic tape is wound up by the supply reel stand 14.

In this way, the reel drive device is capable of selectively driving the take-up reel and kumquat supply reel stand 14 by reversing the rotational direction of the capstan motor 2a.

[Invention tries to solve it! ! 4111) The conventional reel drive device is configured as described above, but when loading the magnetic tape n, the take-up reel Kumquat moves in the direction of the arrow A, and the supply reel stand 14 moves in the direction of the arrow F! At least one must rotate in the direction of Jy. However, the protrusion 8 comes into contact with the leaf spring 9, and the protrusion 10 comes into contact with the leaf spring U, and the take-up reel stand opening and the supply reel stand 14 are locked, resulting in excessive tension on the magnetic tape and the magnetic tape. There was a risk that the tape might be damaged.

This invention was made to solve the above-mentioned 728 problem, and by changing the rotation direction of the capstan motor after loading, it is possible to run the tape in both forward and reverse directions without tape sag. To provide a reel drive device that can be loaded easily without being damaged due to application of excessive tension.

[Means to solve the problem]

The reel drive device according to the present invention disposes a one-way clutch in the middle of transmitting rotational driving force from the capstan motor to the reel, and also provides a slip mechanism on the reel stand, so that during loading and unloading, a supply reel stand or a take-up reel stand is provided. A brake is applied to one side of the reel, and the capstan motor is rotated in the direction in which the brake is applied to rotate the reel stand.
For the same purpose, a one-way clutch is placed in the middle of transmitting rotational driving force from the capstan motor to the reel stand.
By engaging a one-way clutch that engages with one reel stand with a pinch lever, the reel stand and one-way clutch are disengaged during loading or unloading.0 [Operation] In this invention, The reel stand on the side where the brake is applied during loading is prevented from rotating by absorbing the rotational driving force transmitted from the capstan by the slip mechanism of the reel stand, and the reel stand on the side where the brake is not applied is able to record the magnetic tape. It brings out the

Alternatively, one reel stand and the one-way clutch are disengaged during loading and unloading, so tape can be fed out from this reel stand during loading and unloading, and feeding is prohibited from the other reel stand. [Embodiment] Hereinafter, an embodiment of the present invention will be explained with reference to the drawings.
In Figures 1 to 2, 1 is a first gear that is engaged with a capstan motor 2a by a toothed belt b and rotates integrally with the capstan motor 2a, and gear 1 that connects one-way clutches 1 & 17. It meshes with the bell and 17a. 1 and 14a are the own units that respectively control the take-up reel base and the supply reel base 14, and are meshed with gears 161) and 17b, respectively, which are connected to the one-way clutch. The take-up reel Kumquat has a gear wind that meshes with the gear 161) of the one-way clutch, which is 7 L) due to the spring chest.1. It is pressed against Th. The ball 130 is a disk to which the felt 13b of the box is attached, and is integrally formed with the disk (2) that contacts the brake pad pressed into the hole camp. The structure of the one-way clutch ν is shown in FIG. In the figure, 17a is a gear that meshes with gear 1, and gear 1 of supply reel stand 14.
A bundle 17c, which is press-fitted and fixed to a gear 17b that meshes with the gear 4a, and a roller lχ are held therebetween. And the gear-like cam has a wedge-shaped cam shape! Spring 17 @
The roller 17a is urged in the direction of biting into this wedge-shaped cam shape. On the other hand, one-way clutch 1
6 is also one-way, and is mounted in the same way as clutch 17, but the wedge shape is in the opposite direction, and the brake is held freely rotatable around the shaft 19 installed in the deck base. It is configured so that it can come into contact with the disk of the take-up reel stand 13 by applying pressure.

Next, the operation will be explained. From the state shown in FIG. 4, that is, the second position, the magnetic tape is pulled out from the state shown in FIG. 5, that is, the first position aX, and the tape is placed at a predetermined position around the rotating drum. Loading, and conversely, returning the tape from the first position to the second position is called unloading. First, to explain the operation during loading, the brake speed is the first.
It is located at the position shown by the solid line in the figure, and is in contact with the disk between the take-up reel stands. At this time, when the capstan motor h is rotated in the direction of arrow M, the gear island is rotated in the direction of arrow 0, but since rotation of the disc 13a is prohibited by the brake pedal, the disc 13G does not rotate. , the driving force transmitted from the capstan motor 2 & is felt L.
3b'''cg & collected.-10,000, the supply reel stand 14 is
When the capstan motor 2a rotates in the direction of the arrow,
The gear 17m of the one-way clutch ν rotates in the direction of the arrow G, and as shown in FIG. 14 is free to rotate in the direction of arrow r. The magnetic tape nail is pulled out by a tape pull-out mechanism (not shown) that applies a traction force directly to the magnetic tape target.
Because of this structure, the magnetic tape is quickly drawn out from the supply reel without interfering with the operation of the tape drawing mechanism (not shown).

Next, the operation during unloading will be explained.

At this time as well, the brake control prohibits the rotation of the take-up reel head, and when the capstan motor rotates in the direction of arrow B, the gear 17a of the one-way clutch 17 rotates in the direction of arrow ■, and due to the wedge effect, The roller 17t1 bites and the bushing 170 is also rotated in the direction of the arrow H, and the gear 17b into which the bushing 17c is press-fitted is also rotated in the direction of the arrow H. Therefore, the supply reel stand 14 is
The magnetic tape 21 is rotated in the direction of , and the magnetic tape 21 is wound up during unloading.

In this embodiment, the brake lever is brought into contact with the take-up reel stand B side, but it may be brought into contact with the supply reel stand 14@ and configured in the same manner as in the above embodiment.
At any time during unloading, the supply reel stand 14 is prevented from rotating by the brake, and the magnetic tape 2 is pulled out from the take-up reel Kumquat. or wind up.

FIGS. 6 and 7 show other embodiments of this invention,
In the figure, 1 is the capstan motor h and the toothed bell)
It is a first gear that is engaged at 15 and rotates integrally with the capstan motor 2a, and meshes with gears 16& and 17& that constitute a one-way clutch. 13aJ4
Gears a are formed integrally with the take-up reel stand B and the supply reel stand 14, respectively, and are meshed with gears 16b and 17b, respectively, which allffi the one-way clutch. On the other hand, the road is a pinch roller, which is installed freely around the shaft & which is installed at one end of the pinch lever 4, which is installed freely around the shaft 31 installed on the tenki base m. has been done. In addition, the pinch lever 4 is biased by a spring, and a transmitting force release device w30 consisting of a lever rotatably held around a shaft erected at one end of the pinch lever 9 is used to release the pinch lever 9. Engaged with Franchise. The one-way clutch 16 is held rotatably around a shaft B installed at one end of the lever I, and is connected to the gear 1 by a lever path that is rotatably held around an axis η. The one-way clutch 16 is configured such that the clutch m and the gear 1h mesh with each other, and the one-way clutch 16 is movable about the axis l. The structure of the one-way clutch 16 is shown in FIG. In the figure, 16a is a gear that meshes with the gear 1, and a bush 16c is press-fitted and fixed to the gear 16b that meshes with the gear 13a of the take-up reel platform.
The roller 16d is also held between the rollers 16d and 16d. And gear 16
A has a wedge-shaped cam shape WIt, and the roller 11 is biased by a spring 16e in the direction of biting into this wedge-shaped cam shape. - The one-way clutch 17 is also constructed in the same manner as the one-way clutch 16, but the wedge shape is in the opposite direction.

Next, NR will explain the operation. In the first state shown in FIG. 4, the pinch roller is located at two points 5its in FIG. 6, and when tape A is loaded in the second state shown in FIG. is moved to the position indicated by the solid line in FIG. 6 by a mechanism not shown. At this time, the lever lever is also moved in conjunction with the pinch roller from the two-dot chain line to the position indicated by the solid line, and in conjunction with this, the one-way clutch 16 is also moved from the two-dot chain line to the position indicated by the solid line. Therefore, during loading, the one-way clutch 16 was made to not engage with the take-up reel kumquat, so during loading,
The take-up reel Kumquat can rotate freely, so the tape can be pulled out smoothly and loading can be completed.

Regarding the operation yjr of the one-way clutch 16 in FIG. 8, when the teeth Ji 16a rotate in the direction of the arrow G, the roller 16d bites due to the wedge effect, and the bushing 16c is also rotated in the direction of the arrow G, so that the bushing 16c is press-fitted. The gear 16b shown in FIG. 1 is also rotated in the direction of arrow G. On the other hand, gear 16a moves in the opposite direction to arrow G.
When is rotated, the bunsch 16c does not bite, so that the gear 1a) can freely rotate relative to the gear 1&L.

Note that the ails of the one-way clutch 16 does not have to have the shape shown in FIG. 8, and may be any mechanism that applies driving force only when rotating in one direction and allows free rotation in the opposite direction.

Furthermore, during loading, the mechanism for separating one one-way clutch from the reel stand does not have to be the tag shown in FIG. 6, and may be a mechanism such as a cam that is not interlocked with the pinch lever.

Further, during loading, the mechanism for disengaging the capstan motor from one of the reel stands does not need to be a mechanism that swings the one-way clutch.

〔Effect of the invention〕

As described above, according to the reel drive device of claim 1, by rotating the capstan motor during loading, one of the reel stands is freely driven to pull out the magnetic tape, and the magnetic tape is rotated by the capstan motor. The other reel stand has a structure that prevents rotation by engaging the brake and absorbs this rotational force inside the reel stand. After loading, the rotating direction of the capstan motor can be changed to rotate forward or reverse. The reel drive according to claim 2 has the effect of being able to run the tape in both directions without tape sag, and to provide a highly reliable product that is free from the risk of damage due to excessive tension being applied to the tape during loading. According to the device, since it is configured to release the transmission force between the capstan motor and one reel stand during loading, it is possible to feed out the tape during loading, and the rotating direction of the capstan motor changes after loading. At the same time, the rotation direction of the reel stand can be changed, allowing the tape to run in both forward and reverse directions without causing tape slack, thereby maintaining good contact between the tape and the head. The tape is highly reliable, does not damage or stain the tape, and has the effect of providing excellent responsiveness.

[Brief explanation of drawings]

FIG. 1 is a plan view of essential parts of a reel drive device according to an embodiment of the present invention, FIG. 2 is a sectional view of the reel drive device according to an embodiment of the invention, and FIG. 3 is a plan view of a main part of a reel drive device according to an embodiment of the invention. A side sectional view and a plan sectional view of the one-way clutch; FIG. 4 is a plan view of essential parts showing an unloading state according to an embodiment of the present invention; FIG. 5 is a plan view of essential parts showing a loading completed state; 7 is a sectional view of the reel drive device according to another embodiment of the invention, and FIG.
The figures are a sectional side view and a sectional plan view of a one-way clutch according to another embodiment of the invention. FIG. 9 is a side view showing a conventional reel drive device, FIG. 10 is a side view showing a conventional reel drive device, and FIG. 11 is an enlarged view of the Y section in FIG. 1O. In the figure, 1 is a gear, 2 is a capstan, 2a is a capstan motor, B is a take-up reel stand,] 4 is a supply reel stand, 1
3a and 14a are gears, 16.17 is one-way clutch, 16a, 16kx 17h17b is gear, quick is brake, 19 is shaft, pressure is spring, Otsu is tape, Otsu is rotating drum, illusion is spring, 24.2S%η , 31 and 32 are shafts, a path is a pinch roller, a container is a pinch lever, and a lever is a transmission force release mechanism lever. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (2)

[Claims] (1) A second position where a tape cassette, in which a pair of reels on which magnetic tape can be wound are loaded in parallel, can be attached and removed, and a first position where the magnetic tape is wound around a rotating drum and where electromagnetic conversion is possible. A reel drive device in a magnetic recording and reproducing device that performs a loading or unloading operation, comprising: a capstan motor as a drive source for driving the reel;
a one-way clutch that is connected to the capstan motor and transmits the driving force of the capstan motor only when the capstan motor rotates in a direction in which one of the take-up reels winds the magnetic tape; Similarly, a one-way clutch that transmits the driving force of the capstan motor only when the capstan motor rotates in a direction in which the other supply reel winds the magnetic tape, a gear meshing with the one-way clutch, and the above. A reel stand consisting of a slip mechanism that determines the upper limit of the driving force transmitted by the capstan motor, and a disk to which the driving force is transmitted via this slip mechanism, and a reel stand that engages with this disk. When loading the magnetic tape from the second position to the first position, the capstan motor is rotated, and the brake is applied to the disk of the reel stand driven by the capstan motor. A reel drive device for a magnetic recording and reproducing device, characterized in that the reel drive device prevents rotation of a reel stand by abutting the reel. (2) a second position where a tape cassette loaded in parallel with a pair of reels capable of winding magnetic tape can be attached and detached; and a first position where the magnetic tape is wound around a rotating drum and where electromagnetic conversion is possible; A reel drive device in a magnetic recording and reproducing device that performs a loading or unloading operation, comprising: a capstan motor as a drive source for driving the reel;
a one-way clutch that is connected to the capstan motor and transmits the driving force of the capstan motor only when the capstan motor rotates in a direction in which one of the take-up reels winds the magnetic tape; Similarly, the other supply reel includes a one-way clutch that transmits the driving force of the capstan motor only when the capstan motor rotates in the direction in which the magnetic tape is wound; and a one-way clutch that transmits the driving force of the capstan motor during the loading operation. A reel drive device for a magnetic recording and reproducing device, characterized in that a transmission force release mechanism is provided for releasing the engagement between the take-up reel and one of the supply reel and the take-up reel.