JP2002074783A - Reel turntable mechanism and recording or reproducing device having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reel turntable mechanism of a recording or reproducing device which is little in the number of parts, is simple in structure, may be reduced in the total thickness of the mechanism and is low in cost as well. SOLUTION: This mechanism has the reel turntable 28 on a slide chassis 27 slidably held to a stationary chassis 1. Drive systems 31 and 52 of the reel turntable 28 are arranged between the stationary chassis 1 and the slide chassis 27 to control the driving of the reel turntable 28 from the lower side of the slide chassis 27. The reel turntable 28 includes a brake pressurized contact section and a reel turntable drive gear section 52 and the slide chassis 27 is disposed therebetween. The reel turntable 28 includes a reel shaft 53 fixed to the reel turntable drive gear section 52 and the reel shaft 53 is press-fitted to a take-up section and has a dislocation preventive means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism or structure of a reel base of a recording or reproducing apparatus for pulling out a tape-shaped magnetic recording medium (magnetic tape) and performing forward / reverse running.

[0002]

2. Description of the Related Art FIG. 11 is a plan view showing an example of a conventional magnetic recording or reproducing apparatus. 11, a magnetic tape 101 as a recording medium is supplied from a supply (S) side reel base 102, and is wound around a rotary cylinder 107 having a recording / reproducing head via a tension pole 103 and tape guides 104, 105, and 106. Can be Further, the tape guides 108 and 109, the tape driving capstan 110, the pinch roller 111, and the tape guide 11
After that, the reel is taken up by the take-up (T) side reel base 113.

Next, a reel base driving mechanism in the magnetic recording or reproducing apparatus will be described with reference to FIGS. FIG. 12 is a side view of the S-side reel base drive mechanism of FIG. The S-side reel base 102 and the T-side reel base 113 are respectively fitted rotatably around respective reel shafts 115 and 116 erected from a slide chassis 114. Here, FIGS. 13 (a) and 13 (b)
Although an enlarged side view and a top view of the S-side reel base 102 in FIG. 12 are shown, the T-side reel base 113 has the same configuration.

In FIG. 11, a main chassis 1
The power transmitted from the capstan motor 150 disposed on the gear 17 through the gears 118 to 121, a belt (not shown), and the like is transmitted to the shaft 1 mounted from the main chassis 117.
The power is transmitted to a gear 123 rotatably fitted to the gear 22.
Then, the power is transmitted to a gear 126 rotatable about a shaft 125 implanted on a lever 124 rotatable about the shaft 122. The gear 126 and the lever 124 are engaged by torque transmission means (not shown). Lever 124 is gear 1
The rotation of the gear 23 causes the gear 1 to rotate.
The gear 23 is installed so as to mesh with the gear 127 when the gear 23 rotates counterclockwise.

Referring to FIG. 13, an example of the structure of a conventional reel base will be described. A hysteresis plate 128 is insert-molded in the gear 127. Gear 1
The yoke plate 130 is insert-molded on the magnet 29, and the magnet 131 is attracted to the yoke plate 130. Further, a reel claw 133 and a reel claw spring 134 are attached to the gear 129, and the reel cap 132 is press-fitted. The reel claw 133 receives an upward force by the spring 134, but is restricted by the reel cap 132.

The gear 127 and the gear 129 are attracted and attracted by a magnet 131 attracted to the gear 129 with a washer 135 interposed between a contact portion 136 of the gear 127 and a contact portion 137 of the gear 129. The aforementioned reel base is rotatably fitted to a reel shaft 115 erected on the slide chassis 114.

When the gear 126 moves in the direction of the arrow in the figure and meshes with the gear 127, hysteresis loss by the magnet 131 and the hysteresis plate 128, and further, the gear 127
Contact portion 136, contact portion 137 of gear 129, and friction loss caused by washer 135.
Is transmitted to the gear 129 at a constant torque.

In FIG. 11, when the gear 123 rotates counterclockwise, the lever 124 rotates counterclockwise about the shaft 122. In conjunction with the movement, the gear 126
Rotates to a position where it meshes with the gear 127. As a result, the gear 127 (and the reel base) is turned counterclockwise,
Here, the reel claw 133 rotates in the rewind / rewind direction.
Thus, the tape 101 wound around the reel hub 138 (FIG. 13A) is wound around the T-side reel 113.

At this time, the tape 101 is wound with a constant torque by the above-described torque transmitting means (hysteresis loss by the hysteresis plate 128 of the magnet 131, friction loss by the gear contact portion and the washer).

In FIG. 11, a soft brake 140 and a lock brake 141 on the T side and a lock brake 143 on the S side are respectively disposed on the shafts 139 and 142 mounted on the slide chassis 114.
A T-reel side soft brake 140, a lock brake 141, and a T-reel side brake are operated by a loading motor 144 via a mode lever (not shown) operated by a loading gear train (not shown) according to the operation mode of the deck.
The S-reel side lock brake 143 and the like are turned on / off.

The T-reel side soft brake 140 and lock brake 141, and the S-reel side lock brake 143 are provided with a gear 127 or a gear 129 (FIG. 13).
By contacting and engaging with (a)), it functions as a soft brake or a lock brake.

[0012]

However, FIG.
In the above-described conventional example, each reel base is arranged on a slide chassis 114, a torque limiter (clutch) mechanism is built in the reel base, and a brake contact part is further provided. For this reason, the structure of the reel base is complicated, and it is necessary to increase the thickness between the slide chassis 114 from below the cassette. In addition, costs increase accordingly.

In view of such circumstances, an object of the present invention is to provide a reel base mechanism of a recording or reproducing apparatus which has a small number of parts, has a simple structure, can reduce the total thickness of the mechanism, and is inexpensive.

[0014]

SUMMARY OF THE INVENTION Therefore, in the present invention, the above object is achieved by realizing the following reel base mechanism of a recording or reproducing apparatus. That is, the reel base mechanism of the present invention is a reel base mechanism including a reel base on a slide chassis supported slidably with respect to a fixed chassis, wherein the reel base is provided between the fixed chassis and the slide chassis. And a drive system for driving the reel base from below the slide chassis.

Further, in the reel stand mechanism according to the present invention, the reel stand includes a brake press contact portion and a reel stand driving gear portion, and the slide chassis is disposed therebetween.

In the reel stand mechanism of the present invention, the drive system includes an idler gear for driving the reel stand drive gear, and the reel stand drive gear and the idler gear are disposed between the fixed chassis and the slide chassis. It is characterized by being performed.

Further, in the reel base mechanism of the present invention, the reel base includes a reel shaft fixed to the reel base driving gear portion, and the reel shaft is press-fitted into a winding portion and has a slip-off preventing means. It is characterized by the following.

Further, in the reel stand mechanism of the present invention, a tip of the reel shaft is projected to the fixed chassis side from the reel stand drive gear portion.

Further, the reel base mechanism of the present invention is a reel base mechanism having a reel base on a slide chassis supported slidably with respect to a fixed chassis. The slide chassis is disposed between the reel base drive gear and an idler gear that drives the reel base drive gear is disposed between the fixed chassis and the slide chassis and fixed to the reel base drive gear. The fixed reel shaft is fixed so as to protrude toward the fixed chassis from the reel base driving gear portion. Further, in the reel base mechanism of the present invention, a distal end portion of the reel shaft facing the fixed chassis is formed in a shape to be in pinpoint contact with the fixed chassis, and has a predetermined gap between the fixed chassis and the fixed chassis. It is characterized by being arranged in a state.

The recording or reproducing apparatus according to the present invention is a recording or reproducing apparatus for pulling out a tape-shaped recording medium and performing forward / reverse running, and records or reproduces information on or from the tape-shaped recording medium. A rotary drum device having a head for performing the above, a cassette for accommodating the tape-shaped recording medium, and a slide chassis for supporting the cassette so as to be able to advance and retreat with respect to the rotary drum device; A reel mechanism according to any one of claims 1 to 6, and a guide mechanism configured to pull out the tape-shaped recording medium from the cassette and run the recording medium along a predetermined tape path. And characterized in that:

According to the present invention, in a reel base mechanism of a recording or reproducing apparatus having a slide chassis for pulling out a magnetic tape and running in a forward / reverse direction, a tape take-up section and a brake press-contact section do not include a torque limiter section. A slide chassis is disposed between the fixed chassis and the slide chassis, and an idler gear is disposed between the fixed chassis and the slide chassis. Then, the reel base and the reel gear portion are press-fitted into the reel base by a shaft caulked by the reel gear, and a knurl-type groove for preventing slippage is formed in the press-fitting portion of the reel shaft so as to prevent press-fitting and dropout. Is configured. As a result, it is possible to provide a reel base mechanism which has a small number of components, has a simple structure, can reduce the total thickness of the mechanism, and can be manufactured at low cost.

In the reel shaft fixed to the reel base driving gear portion, the reel shaft is fixed so as to protrude from the gear portion toward the fixed chassis. For this reason, it is possible to prevent the reel base driving gear from contacting the fixed chassis side, and it is possible to realize a mechanism that can effectively cope with a reduction in total thickness due to further miniaturization and thinning.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing a tape path and a positional relationship between a cassette and a rotating drum / guide post in a recordable / reproducible state according to the present embodiment, and around a reel driving mechanism. In the figure, 1
Is a fixed main chassis (fixed chassis), 2 is a record
A rotating drum having a reproducing head, 3 is a main chassis 1
The capstan formed above, 39 is a cassette at the recording / reproducing position, 25 is a tension post, 38 is an S-side main inclined post, 20 is an S-side drum winding guide post, 2
1 is a T-side drum winding guide post, 26 is a T-side draw-out post, 28 is an S-side reel stand, and 29 is a T-side reel stand.

33 is a first pulley formed coaxially with the capstan 3, 40 is a timing belt, 41 is a roller for guiding the timing belt 40, 32 is a second pulley, and 30 is a drive gear having a torque limiter. , 3
1 is an idler gear that selectively meshes with the S-side reel base 28 and the T-side reel base 29 as the capstan 3 rotates.
18 is a pinch roller.

FIG. 2 is a view showing a slide chassis which is slidably supported relative to the main chassis 1 when the cassette is loaded and when recording or reproducing. In the figure, a tension post 25 and a T-side pull-out post 26 are rotatably supported by a slide chassis 27 via a link mechanism. The S-side reel base 28 and the T-side reel base 29 are rotatably supported on a slide chassis 27, respectively. Slide chassis 27
Is engaged with a slide lever provided on the main chassis 1 side, which will be described later, to perform a sliding operation on the main chassis 1.

FIG. 3 is a view showing a driving mechanism configured on the main chassis 1. As shown in FIG. In the figure, 4 is a loading motor, 5, 6, and 7 are each gear, 8 is a first cam gear, 9 is a slide lever, 10 is a loading lever,
Reference numerals 12, 13, and 14 denote respective relay gears, reference numeral 15 denotes a second cam gear, reference numeral 16 denotes a brake drive lever, reference numeral 17 denotes a pinch drive lever, and reference numeral 18 denotes a pinch roller.

FIG. 4 is a view showing a guide post driving mechanism. In the drawing, reference numeral 19 denotes a drum base which supports the rotary drum 2 (FIG. 1) and has a guide post positioning portion after the tape is pulled out. Reference numerals 20 and 21 denote guide members having guide posts, respectively. 24, and is driven by gear portions 22 'and 23' meshing with the gear portion of the loading lever 10 (FIG. 3) from the cassette loading position A to the recording / reproducing position B. . The S-side main inclined post 38 is formed on the drum base 19.

FIG. 5 is a diagram showing the main chassis 1. In the figure, a main chassis 1 made of silicon steel sheet includes:
An electric circuit pattern 43 is formed. Reference numeral 34 denotes a driving coil of the capstan motor, 44 denotes a Hall element, and 35, 36, and 37 denote respective sensor elements.

FIG. 6 is a diagram showing a tape path.

Next, the operation of this embodiment will be described with reference to FIGS. When the cassette 39 is loaded, the loading motor 4 (FIG. 3) rotates, and the first cam gear 8 rotates via the gears 5, 6, 7. First
The rotation of the cam gear 8 causes the slide lever 9 and the loading lever 10 to rotate in the direction of the arrow in FIG. The rotation of the slide lever 9 in the direction of the arrow moves the slide chassis 27 (FIG. 2) from the cassette loading position to the recording / reproducing position.

At this time, the tension post 25 and the T-side pull-out post 26 shown in FIG. 1 change in position relative to a cam (not shown) formed on the main chassis 1 side.
The user moves the front of the cassette 39 from within the mouse.
Then, by the rotation of the loading lever 10, the gear portion formed on the loading lever 10 drives the gear portion of each guide member 22 ', 23' (FIG. 4). Each guide post 20, 21 moves from the inside of the cassette mouse (position A) to the recording / reproducing position (position B) along the groove of the guide rail 24 and the groove of the drum base 19 to remove the tape stored in the cassette. It is wound around the rotating drum 2 to make it recordable or reproducible. Each of the guide posts 20 and 21 is fixed by a positioning portion of the drum base 19.

Further, the power of the loading motor 4 is transmitted to the second cam gear 15 via the relay gears 12, 13, and 14 in FIG. The pinch drive lever 17 is driven by the second cam gear 15, and the pinch roller 18 is pressed or separated from the capstan 3. Pulled out of the cassette 39 by the power of the loading motor 4,
The tape wound around the rotary drum 2 is sent by a capstan 3 (FIG. 1) formed on the main chassis 1 side and a pinch roller 18.

At this time, the turning power of the capstan 3 is transmitted to the second pulley 32 via the timing belt 40. The rotating power of the second pulley 32 is transmitted to the T-side reel base 29 via the drive gear 30 and the idler 31, and the tape sent by the capstan 3 and the pinch roller 18 is converted into a cassette by the T-side reel base 29. Wound up inside.

As shown in FIG. 6, the tape pull-out posts (tension post 25, S-side guide post 20 and T-side guide post 26) are present in the mouse of the cassette 39 when the cassette 39 is loaded, and are loaded by the loading operation. The tape in the cassette 39 is pulled out so that recording or reproduction is possible. These tape drawer posts are
A line that is substantially parallel to a straight line a connecting the center of the S-side reel base 28 and the center of the T-side reel base 29 in a recordable or reproducible state, and that exists between the center of the rotary drum 2 and the chassis end face c. It is configured to be located one minute above. At this time, the rotary drum 2 is inclined in the direction of the third quadrant in the XY rectangular coordinate system when the straight line a is defined as the X axis and the right side is defined as plus.

Referring now to FIG. 7, the details of the structure of the reel base will be described. 28 (or 29) is an S-side reel stand (or T-side reel stand), 51 is a reel stand sleeve erected on the slide chassis 27, and 52 is a reel drive gear (S
Side reel base or T side reel base), and the reel shaft 53
The caulking is fixed. The reel shaft 53 fits through the reel sleeve 51 and fits into the reel base 28 (or 29).
Press fit.

FIG. 8 is a detailed view of the press-fitting portion of the reel shaft 53. In the figure, the reel base 28 (or 29) is d
The portion is press-fitted to the reel shaft 53. Further, in FIG. 7, reference numeral 54 denotes a reel claw, which is urged upward by a spring (not shown), but its upward movement is regulated by the stopper claw 28 'of the reel base 28 (or 29). . Reference numeral 55 denotes a reel hub engaged with the reel base 28 (or 29). Further, 28 "is a reel base 2
8 (or 29) shows a brake pressure contact portion.

FIG. 9 is a detailed view showing the knurled portion of the press-fitting portion of the reel shaft 53. In the drawing, the press-fitting portion of the reel shaft 53 has a knurl 56 as shown in FIG. FIG. 9B is an enlarged sectional view showing a detailed structure of the knurl portion. This prevents rotation after press-fitting with the reel base 28 (or 29) and prevents the reel base 28 (or 29) from coming off.

FIG. 10 is an enlarged detailed view showing the positional relationship between the caulked portion of the reel shaft 53 and the reel drive gear 52 and the fixed chassis. In the figure, a tip portion 53b of the reel shaft 53 is formed as, for example, a conical convex portion as illustrated. That is, for example, as shown in the figure, when the run-out tolerance of the reel drive gear is A, the protrusion at the front end of the reel shaft 53 is made to protrude by B from the reel gear portion. By making B larger than A, the convex portion at the tip functions as a spacer with respect to the fixed chassis 1, and the reel shaft 53 is fixed to the fixed chassis 1 by the swing of the reel gear portion due to the dimensional variation of the fixed chassis 1 and other components. 1
It can be prevented from contacting.

By the way, as shown in FIG.
A predetermined gap C is provided between the leading end 53b of the reel drive gear and the fixed chassis 1, but if this gap cannot be made larger than the run-out tolerance of the reel drive gear, The leading end 53 of the reel shaft 53
b may come into contact with the fixed chassis 1. When the outer peripheral portion or the tooth tip portion of the gear portion of the reel drive gear 52 comes into contact with the fixed chassis 1, a loss of the winding torque of the T (or S) side reel base or a torque unevenness of the winding torque occurs. According to the present invention, the tip portion 53b of the reel shaft 53 is formed into, for example, a conical shape (or may be a spherical shape) so as to be positively applied to the fixed chassis 1 at a pinpoint, thereby reducing torque loss. And unevenness can be reduced. With these configurations, it is not necessary to take the gap C larger than necessary in consideration of the case where the reel shaft 53 contacts the fixed chassis 1, and this has a very large effect in reducing the overall thickness of the apparatus.

In FIG. 7, when the idler gear 31 moves in the illustrated direction and meshes with the reel base 28 (or 29), its power is transmitted. Then, as described above, the rotation of the idler gear 31 that rotates the reel hub 55 meshing with the reel claw 54 and winds the tape wound on the reel hub 55 depends on the power of the capstan (motor) 3 (FIG. 1). The transmission is transmitted to the drive gear 30 via the belt 41 and the pulley 32, the limiter torque is set by the clutch mechanism of the drive gear 30, and a constant torque is transmitted.

[0041]

As described above, according to the present invention, in a reel stand such as a VTR for pulling out a tape and performing forward / reverse running, a clutch mechanism is not built in, the number of parts is small, the structure is simple, and the mechanism is simple. It has the advantages that the total thickness can be reduced, adverse effects such as mechanical trouble due to the reduction in thickness can be suppressed, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a tape path and a reel driving mechanism in a recordable or playable state according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a slide chassis according to the embodiment of the present invention.

FIG. 3 is a diagram illustrating a drive mechanism on a main chassis according to the embodiment of the present invention.

FIG. 4 is a diagram illustrating a drive mechanism of a tape guide according to the embodiment of the present invention.

FIG. 5 is a diagram showing a main chassis according to the embodiment of the present invention.

FIG. 6 is a diagram illustrating a tape path according to the embodiment of the present invention.

FIG. 7 is a diagram showing a structure of a reel base in the embodiment of the present invention.

FIG. 8 is a view showing a detailed structure of a press-fitting portion of the reel shaft of FIG. 7;

FIG. 9 is a detailed view of a knurled part of a press-fitting part in the reel shaft of FIG. 8 and a sectional view thereof.

FIG. 10 is a view showing the periphery of the tip of the reel shaft of FIG. 8;

FIG. 11 is a plan view of an example of a conventional magnetic recording or reproducing device.

FIG. 12 is a side view of a drive mechanism of the supply-side reel base of FIG. 11;

13A is an enlarged side view and FIG. 13B is a top view of the supply-side reel base shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main chassis 2 Drum 3 Capstan 20 S side guide post 21 T side guide post 25 Tension post 26 T side drawout post 27 Slide chassis 28 S side reel stand 29 T side reel stand 31 Idler gear 51 Reel sleep 52 Reel drive gear 53 Reel Shaft 54 Reel claw 55 Reel hub

Claims (8)

[Claims] 1. A reel base mechanism provided with a reel base on a slide chassis supported slidably with respect to a fixed chassis, wherein a drive system of the reel base is provided between the fixed chassis and the slide chassis. A reel base mechanism, wherein the reel base mechanism is arranged to drive and control the reel base from below the slide chassis. 2. The reel base mechanism according to claim 1, wherein the reel base includes a brake pressure contact part and a reel base driving gear part, and the slide chassis is disposed therebetween. 3. The driving system according to claim 2, wherein the drive system includes an idler gear for driving the reel base drive gear, and the reel base drive gear and the idler gear are disposed between the fixed chassis and the slide chassis. Item 2
The reel base mechanism described in 1. 4. The reel base includes a reel shaft fixed to the reel base drive gear unit, and the reel shaft is press-fitted into a winding unit and has a slip-off prevention unit. Or the reel base mechanism according to 3. 5. The reel base mechanism according to claim 4, wherein a front end of the reel shaft projects from the reel base drive gear to the fixed chassis. 6. A reel base mechanism provided with a reel base on a slide chassis supported slidably with respect to a fixed chassis, wherein the reel base mechanism is provided between a winding section of a tape-shaped recording medium and a reel base drive gear section. Wherein the slide chassis is disposed, an idler gear for driving the reel base drive gear is disposed between the fixed chassis and the slide chassis, and a reel shaft fixed to the reel base drive gear portion is provided on the reel. A reel base mechanism fixed so as to protrude from the base drive gear toward the fixed chassis. 7. A front end portion of the reel shaft facing the fixed chassis is formed in a shape that comes into contact with the fixed chassis at a pinpoint, and is arranged with a predetermined gap between the fixed shaft and the fixed chassis. The reel base mechanism according to claim 6, wherein: 8. A recording / reproducing apparatus for pulling out a tape-shaped recording medium and performing forward / reverse running, comprising: a rotary drum having a head for recording or reproducing information on / from the tape-shaped recording medium. A device and a cassette for storing the tape-shaped recording medium are mounted,
A slide chassis that supports the cassette so as to be able to advance and retreat with respect to the rotary drum device; a reel base mechanism according to any one of claims 1 to 7 supported by the slide chassis; and the tape-shaped recording medium. Pull out from the cassette,
A recording / reproducing apparatus comprising: a guide mechanism for causing the recording medium to travel along a predetermined tape path.