JP2663993B2 - Reel drive of magnetic recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel drive of a magnetic recording / reproducing apparatus for recording or reproducing a signal on a magnetic tape.

[Conventional technology]

FIG. 9 to FIG. 11 are views showing a conventional reel driving device disclosed in, for example, Japanese Patent Application Laid-Open No. 64-33755, wherein 1 is engaged with a capstan motor 2 by a gear 3, This is a first gear that rotates integrally with the capstan motor 2, and the first gear 1 is composed of three gears 5, 6, 7 that are coaxially and independently rotatably arranged on a shaft 12. And the gear 6 located in the middle of the gear. 13a and 14a are gears formed integrally with the take-up reel base 13 and the supply reel base 14, respectively, and mesh with the gears 5 and 7, respectively. As shown in FIG. 11, one of the opposing surfaces of the gear 5 and the gear 6 has an annular saw-toothed projection 8, and the other surface has a leaf spring 9 whose tip abuts the saw-toothed projection 8.
Has been fixed. On one of the surfaces of the gears 6 and 7 facing each other, a saw-tooth-shaped projection 10 in the opposite direction to the saw-tooth-shaped projection 8 is provided in an annular shape.
Are provided in the direction opposite to the leaf spring 9. Therefore, only when the gear 6 rotates in the A direction, a driving force is applied to the gear 5 and the gear 7 is rotatable in the B direction. When the gear 6 rotates in the B direction, a driving force is applied only to the gear 7,
The gear 5 is rotatable in the A direction.

Next, the operation will be described. In the forward feeding state in which the magnetic tape 21 is moved from the supply reel to the take-up reel, the capstan motor 2a rotates in the direction A in the drawing, and this rotational force is transmitted to the gear 6 via the gear 3 and the gear 1. You. At this time, the gear 6 rotates in the direction A in FIG.
The rotation force is transmitted only to the gear 5 by the action of the gear, and the gear 13a rotates in the direction C in FIG. Further, since the rotational force of the gear 6 is not transmitted to the gear 7 and thus to the gear 14a, the magnetic tape 2
1 is to be taken up by the take-up reel base 13.

Next, in the reverse feed state in which the magnetic tape 21 is moved from the take-up reel to the supply reel, the capstan motor 2a rotates in the direction B in the drawing, and this rotational force is transmitted through the gear 3 and the gear 1 to the gear 6 Is transmitted to At this time, the gear 6
9, the rotational force is transmitted only to the gear 7 by the action of the leaf spring 11, and the gear 14a rotates in the direction E in FIG. Further, since the rotational force of the gear 6 is not transmitted to the gear 5 and thus to the gear 13a, the magnetic tape 21 is wound by the supply reel table 14.

In this way, by reversing the rotation direction of the capstan motor 2a, the take-up reel
It was a reel drive device that could selectively drive the 14.

[Problems to be solved by the invention]

The conventional reel driving device is configured as described above, but when loading the magnetic tape 21, the take-up reel
At least one must rotate in the direction of arrow D at 13 and in the direction of arrow F at the supply reel base 14. However, the projection 8 abuts against the leaf spring 9 and the projection 10 abuts against the leaf spring 11, respectively.
Is locked, causing excessive tension on the magnetic tape 21,
There was a fear that the magnetic tape 21 was damaged.

The present invention has been made in order to solve the above-mentioned problems, and by changing the rotation direction of the capstan motor after loading, the tape can be run without slack in both the forward and reverse directions. It is an object of the present invention to obtain a reel drive device that can be loaded without difficulty without being subjected to excessive tension and being damaged.

[Means for solving the problem]

A reel driving device according to the present invention is arranged such that a one-way clutch is arranged in the middle of transmitting rotational driving force from a capstan motor to a reel, and a slip mechanism is provided on a reel base. A brake is applied to one side of the table, and a direction capstan motor for rotating the reel table with the brake is rotated.

For the same purpose, a one-way clutch is arranged on the way of transmitting the rotational driving force from the capstan motor to the reel base, and the one-way clutch that meshes with one of the reel bases is engaged with the pinch lever to perform loading or loading. At the time of unloading, the reel base is disengaged from the one-way clutch.

[Action]

In the present invention, the reel base on which the brake is applied at the time of loading is prevented from rotating by the rotational driving force transmitted from the capstan being absorbed by the slip mechanism of the reel base, and the reel base is provided on the non-brake side. The magnetic tape.

Alternatively, one of the reel bases is disengaged from the one-way clutch during loading and unloading, so that the tape can be sent out from the reel base during loading and unloading, and the other reel base is prohibited from being fed. And can be wound up.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1 denotes a first gear which is engaged with the capstan motor 2a by a toothed belt 15 and rotates integrally with the capstan motor 2a.
It is in mesh with the gears 16a and 17a forming the parts 6 and 17. 13
a and 14a are a take-up reel base 13 and a supply reel base 14, respectively.
And meshes with the gears 16b and 17b forming a one-way clutch, respectively. On the take-up reel base 13, a gear 13a meshing with the gear 16b of the one-way clutch is pressed against a felt 13b by a spring 13e.
Reference numeral 13c denotes a disk to which the felt 13b is attached, and a disk 13d for contacting the brake 18 and a reel cap 13f are press-fitted and integrally formed. Here, a take-up reel is formed by the discs 13c and 13d and the reel cap 13f, and a disc on which a gear 13a and a felt 13b are attached.
13c and a spring 13e constitute a slip mechanism. This slip mechanism generates a driving force required for winding the tape by the frictional force between the felt 13b and the gear 13a, and when an excessive driving force is transmitted to the gear 13a, the welt 13b And between the gear 13a. The supply reel base 14 is configured in exactly the same manner as the take-up reel base 13. 3A and 3B show the structure of the one-way clutch 17. FIG. In the drawing, reference numeral 17a denotes a gear that meshes with the gear 1, and the gear 1 meshes with the gear 14a of the supply reel base 14.
The roller 17d is clamped together with the bush 17c press-fitted and fixed to 7b. The wedge-shaped cam shape is formed on the gear 17a, and the roller 17d is urged by a spring 17e in a direction to bite into the wedge-shaped cam shape. On the other hand, the one-way clutch 16 is configured similarly to the one-way clutch 17, but the wedge shape is in the opposite direction.
Also, the brake 18 is a shaft 19 set on the deck base 100.
, And is configured to be able to abut on the disk 13d of the take-up reel table 13 by a spring 20.

Next, the operation will be described. From the state shown in FIG. 4, ie, the second position, the state shown in FIG. 5, ie, the first position
The loading of the magnetic tape 21 at a predetermined position around the rotating drum 22 after the magnetic tape 21 is pulled out to the position, and the unloading of returning the tape from the first position to the second position, on the contrary. . First, the operation during loading will be described. At this time, the brake 18 is at the position shown by the solid line in FIG. 1 and is in contact with the disk 13d of the take-up reel base 13. At this time, the capstan motor 2
When a is rotated in the direction of arrow A, the gear 13a is rotated in the direction of arrow C. However, since the rotation of the disk 13d is prohibited by the brake 18, the disk 13c does not rotate and the capstan motor 2a The transmitted driving force is the Welt 13b
Is absorbed by. On the other hand, when the capstan motor 2a rotates in the direction of arrow A, the gear 17a of the one-way clutch 17 rotates in the direction of arrow G, and as shown in FIG. As long as the rotation speed of the gear 17a is not exceeded in the direction of G, the supply reel base 14 is freely rotatable in the direction of arrow F. To pull out the magnetic tape 21, a tape pulling mechanism (not shown) directly applies a traction force to the magnetic tape 21, but since the supply reel table 14 has a structure rotatable in the direction F in the drawing, this tape The magnetic tape 21 is immediately pulled out from the supply reel side without interrupting the operation of the pull-out mechanism (not shown).

Here, the necessity of driving the capstan 2 in the direction of arrow A during loading will be described in more detail.
When simply trying to pull out the tape from the supply reel base 14 during loading, the bush 17c and the gear 17a
In FIG. 1, the first gear 1 is relayed in FIG. 1 to try to rotate the capstan 2. However, since a rotational force is applied to the take-up reel table 13 in the direction in which the tape is pulled out, that is, in the direction of arrow D, the rotation of the first gear 1 is locked. That is, since the rotation directions of the reel bases on the tape supply side and the tape winding side are different, the gear 1 is locked, so that the tape cannot be pulled out, so that loading cannot be performed. Therefore, in this embodiment, the capstan 2 is apparently supplied with the capstan 2 by rotating the capstan 2 in the direction A so that the gear 17a rotates in the direction of arrow G faster than the rotation of the gear 17b when the tape is pulled out. The engagement with the reel base 14 is released so that the reel base 14 can be freely rotated, so that the tape can be pulled out from the supply reel base.

Next, the operation at the time of unloading will be described. At this time, the brake 18 also prohibits the rotation of the take-up reel base 13,
When the capstan motor 2a rotates in the direction of arrow B, the gear 17a of the one-way clutch 17 rotates in the direction of arrow H,
Due to the wedge effect, the roller 17d bites the bush 17c in the direction of the arrow H, and the gear 17b into which the bush 17c is pressed is also rotated in the direction of the arrow H. Accordingly, the supply reel base 14 is rotated in the direction of arrow E, and winds the magnetic tape 21 at the time of unloading.

In the present embodiment, the brake 18 is brought into contact with the take-up reel table 13 side, but may be brought into contact with the supply reel table 14 side, and the configuration may be the same as in the above-described embodiment. That is, loading,
At any time during unloading, the rotation of the supply reel table 14 is prevented by the brake 18, and the magnetic tape 21 is pulled out from the take-up reel table 13 or wound.

6 and 7 show another embodiment of the present invention. In the drawings, reference numeral 1 denotes a capstan motor 2a which is engaged with a toothed belt 15 and rotates integrally with the capstan motor 2a. And is engaged with gears 16a and 17a forming a one-way clutch. 13a and 14a are gears formed integrally with the take-up reel base 13 and the supply reel base 14, respectively, and constitute a one-way clutch.
It meshes with 16b and 17b, respectively. On the other hand, reference numeral 28 denotes a pinch roller, and a shaft 31 set on the deck base 100.
The pinch lever 29 is rotatably mounted around a shaft 32 mounted at one end of the pinch lever 29. Further, the pinch lever 29 is urged by a spring 23, and a one-way clutch is provided by a transmission force releasing mechanism 30 comprising a lever rotatably held around a shaft 24 implanted at one end of the pinch lever 29. 16 is engaged. The one-way clutch 16 is rotatably held around a shaft 25 planted at one end of the lever 30 and is freely rotatable around a shaft 27.
26, a gear 16 which forms a one-way clutch with the gear 1
The one-way clutch 16 is configured to be able to engage with the shaft 27 and to move about the shaft 27. The eighth
1 and 2 show the configuration of the one-way clutch 16. FIG. In the figure, 16a is a gear that meshes with the gear 1, and the take-up reel base 1
The roller 16d is clamped together with a bush 16c press-fitted and fixed to a gear 16b meshing with the third gear 13a. And the gear
16a is formed with a wedge-shaped cam shape and has a spring 16e.
As a result, the roller 16d is urged in a direction to bite into the wedge-shaped cam shape. On the other hand, the one-way clutch 17 is configured similarly to the one-way clutch 16, but the wedge shape is in the opposite direction.

Next, the operation will be described. In the first state shown in FIG. 4, the pinch roller 28 is at the position indicated by the two-dot chain line in FIG. 6, and when the tape 21 is loaded in the second state shown in FIG. Is moved by a mechanism (not shown) to the position indicated by the solid line in FIG. At this time, the lever 30 is also moved from the two-dot chain line to the position of the solid line in conjunction with the pinch lever 29, and the one-way clutch 16 is also moved from the two-dot chain line to the position of the solid line. Therefore, during loading,
Since the one-way clutch 16 is not engaged with the take-up reel base 13, the take-up reel base 13 can freely rotate during the loading, so that the tape can be pulled out smoothly and the loading can be completed.

The operation of the one-way clutch 16 in FIG. 8 will be described. When the gear 16a rotates in the direction of the arrow G, the roller 16d bites and the bush 16c is also rotated in the direction of the arrow G by the wedge effect, and the gear 16b into which the bush 16c is press-fitted is also rotated in the direction of the arrow G. On the other hand, when the gear 16a is rotated in the direction opposite to the arrow G,
The bush 16c does not bite, so the gear 16b is rotatable with respect to the gear 16a. The mechanism of the one-way clutch 16 does not need to have the shape shown in FIG. 8 in particular, and any mechanism may be used as long as a driving force is applied only during rotation in one direction and rotation in the opposite direction is free.

In loading, one of the one-way clutches may be separated from the reel base by a mechanism other than the mechanism shown in FIG. 6, and may be a mechanism such as a cam that does not interlock with the pinch lever. Further, at the time of loading, the mechanism for releasing the engagement between the capstan motor and one of the reel bases does not have to swing the one-way clutch.

〔The invention's effect〕

As described above, according to the reel driving device of the first aspect, at the time of loading, by rotating the capstan motor, one of the reel bases can be freely rotated to draw out the magnetic tape, and the capstan motor is driven. On the other reel base that is rotated by the brake, the rotation is prevented by engaging the brake and the rotational force is absorbed inside the reel base.After loading, the rotation direction of the capstan motor is changed. Thus, the tape can be run without slack in both the forward and reverse directions, and a highly reliable tape can be obtained without applying excessive tension to the tape at the time of loading.

According to the reel drive device of claim 2, since the transmission force between the capstan motor and one of the reel bases is released at the time of loading, the tape can be fed at the time of loading. After that, at the same time as the rotation direction of the capstan motor changes,
The rotation direction of the reel base can also be changed, and the tape can be switched in both forward and reverse directions without causing tape slack, so that the contact between the tape and the head can be kept good, This has the effect of obtaining a highly reliable and responsive product that does not scratch or contaminate the device.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a reel driving device according to an embodiment of the present invention, FIG. 2 is a sectional view of the reel driving device according to an embodiment of the present invention, and FIG. FIG. 4 is a main part plan view showing an unloading state according to an embodiment of the present invention, FIG. 5 is a main part plan view showing a loading completed state, and FIG. FIG. 7 is a plan view of a main part of a reel driving device according to another embodiment of the present invention. FIG. 7 is a sectional view of the reel driving device according to the above another embodiment of the present invention. The side sectional view a and the plane sectional view b of the one-way clutch according to the embodiment. 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 a portion Y in FIG. In the figure, 1 is a gear, 2 is a capstan, 2a is a capstan motor, 13 is a take-up reel table, 14 is a supply reel table, 13a, 1
4a is gear, 16, 17 is one way clutch, 16a, 16b, 17
a, 17b are gears, 18 is a brake, 19 is a shaft, 20 is a spring, 21 is a tape, 22 is a rotating drum, 23 is a spring, 24, 25, 27, 31,
32 is a shaft, 28 is a pinch roller, 29 is a pinch lever, and 30 is a lever for a transmission force releasing mechanism. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (2)

(57) [Claims] 1. A first position in which a tape cassette in which a pair of reels on which a magnetic tape can be wound is loaded in parallel is detachable, and a first position in which the magnetic tape is wound on a rotating drum and electromagnetically converted. A reel driving device in a magnetic recording and reproducing apparatus that performs a loading operation or an unloading operation on a position, wherein a capstan motor of a driving 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 when the capstan motor rotates in a direction in which one of the reels of the reel winds the magnetic tape; A one-way clutch for transmitting the driving force of the capstan motor when the capstan motor rotates in the direction in which the other supply reel winds the magnetic tape, and in response to a loading operation or an unloading operation, A brake that engages with the take-up reel or the supply reel and prevents this rotation, and a slip mechanism that determines an upper limit of transmission of driving force between at least the reel on which the brake is engaged and the one-way clutch. During the loading operation, the reel on which the brake is engaged is taken up in the winding direction. The capstan motor is rotated, and the magnetic tape is supplied by rotation of the reel on which the brake is not engaged. During unloading operation, the reel on which the brake is not engaged is taken up. A reel drive device for a magnetic recording / reproducing apparatus, wherein the capstan motor is rotated in a direction to wind the magnetic tape. 2. A second position in which a tape cassette in which a pair of reels on which a magnetic tape can be wound is loaded in parallel is detachable, and a first position in which the magnetic tape is wound on a rotating drum and electromagnetically converted. A reel driving device in a magnetic recording and reproducing apparatus that performs a loading operation or an unloading operation on a position, wherein a capstan motor of a driving source for driving the reel;
The driving force of the capstan motor when the take-up motor rotates in a direction in which the take-up reel base connected to the capstan motor and engaged with one of the reels winds the magnetic tape. And the drive force of the capstan motor is transmitted when the capstan motor rotates in the direction in which the supply reel base, which also engages with the other supply reel, winds the magnetic tape. A one-way clutch and transmission force releasing means for releasing engagement between the capstan motor and one of the take-up reel base or the supply reel base during the loading operation or the unloading operation. Reel drive of magnetic recording and reproducing device.