JPH1011850A - Magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a simple and inexpensive mechanism without providing a changeover member exclusive for changing over the transmission of driving power from a capstan motor to a cassette loading device. SOLUTION: A changeover gear 15 is moved in the axial direction to the position where the engagement is released from the engaged position against a transmission gear 17 transmitting the driving power of the capstan motor. The changeover gear 15 is engaged with an input gear 19 of the cassette loading device through an idler gear 18. A changeover operating part 13a integrated with a sub-brake is inserted between a substrate 30 and the changeover gear 15 to make the transmission gear 17 engage with the changeover gear 15 only at the time of the mode for driving the cassette loading device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus in which a magnetic tape and a cassette mounting device are driven by a capstan motor.

[0002]

2. Description of the Related Art FIG. 7 is a plan view of a conventional magnetic recording / reproducing apparatus during reproduction. 1 is a magnetic tape, 2 is a capstan motor, 2a is a capstan, 2b is a capstan pulley, 3 is a pinch roller, 4 is a belt, 5 is a pulley portion, 6
Is a makitori gear, 12 is a T reel stand, 20 is a cassette,
Reference numeral 30 denotes a substrate. Cassette 2 mounted on substrate 30
0, the magnetic tape 1 is pulled out and wound around the cylinder 21, and recording or reproduction is performed. Magnetic tape 1
Is provided at the axis of the capstan motor 2 and is pinched by the capstan 2a and the pinch roller 3, which rotate integrally with the capstan motor 2, and is transferred at a constant speed in the direction of the arrow shown in the figure by the constant speed rotation of the capstan 2. .

Further, rotation is transmitted to a capstan pulley 2a via a belt 4 hung on a pulley 2b provided integrally with the capstan motor 2, and rotation is transmitted to a pulley 5 to be integrated with the pulley 5. The power is transmitted to the driving side gear 42 of the slip clutch mechanism 41 via the gear 40 meshed with the formed gear portion 5a.

FIG. 8 is a cross-sectional view of a power transmission unit to a tape winding device and a cassette mounting device of a conventional magnetic recording / reproducing apparatus. A friction member 44 is sandwiched between the driving side gear 42 and the driven side member 43, and the rotation of the driven member 43 is transmitted by the frictional force generated by the compression of the spring 45. The rotation is transmitted to a T-reel base (take-up reel base) 12 via a gear 46 provided on an upper part of the driven member 43 and a swing gear 8, and is transferred at a constant speed via the reel base 12. Magnetic tape 1 into cassette 2
Wind it on the reel inside 0.

On the other hand, a switching gear 15 that can move up and down in the axial direction is arranged so as to be able to mesh with the gear portion 5a, and the gear portion 5a and the idler gear 1 are driven by a compression spring 16.
8 is urged in a direction to mesh with the same. When the gear portion 5a and the switching gear 15 mesh with each other, the idler gear 1
8, an input gear 1 of a cassette mounting device (not shown)
The rotation is transmitted to 9.

Here, when the capstan 2a rotates clockwise in FIG. 7, that is, in the normal rotation direction, the cassette mounting device operates in the cassette insertion direction, and when the capstan 2a is counterclockwise, in the so-called reverse direction, It is configured to operate in the cassette discharge direction. In modes other than the insertion / ejection operation of the cassette 20, the switching gear 15 is pushed up against the compression spring 16 by a switching arm (not shown) operated by a control member (not shown), and the gear portion 5a And the power transmission to the cassette mounting device (not shown) is cut off. As a known example of the magnetic recording / reproducing apparatus for driving the cassette mounting apparatus by the power of the capstan motor as described above, there is JP-A-62-60156.

[0007]

However, in the above-mentioned prior art, since a member for switching power transmission to the cassette mounting device is provided exclusively, the number of parts increases and the layout of parts due to the occupied space is required. There are problems such as restrictions on

[0008]

According to the present invention, in order to solve the above-mentioned problems, the reverse rotation is achieved by bringing the magnetic tape into contact with a reel base for supplying the magnetic tape or a gear drum directly connected to the reel base during reverse rotation reproduction. A braking member for adding a tape back tension at the time of reproduction, a cassette mounting device for inserting and ejecting the cassette, and a capstan motor for generating a driving force of the cassette mounting device and a tape driving force; Power transmission switching means for switching power transmission from the capstan motor to the cassette mounting device using the braking member within an operation range where the power is separated from the reel base and a braking force is not generated on the reel base. Thereby, the number of parts can be reduced and the space efficiency can be improved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS. FIG. 5 is a plan view of the mechanism in a recording or reproducing state, and FIG. 6 is a rear view thereof. In addition, T used in the code is take-up (winding), S is supply (supply), PR is a pinch roller, L is left, R
Is an abbreviation of a light, and is a code added for convenience to distinguish the same member. In FIG. 5, 1 is a magnetic tape, 2a is a capstan, 20 is a cassette, 30 is a substrate, 111 is a driving gear, 112 is a PR relay gear, 113
Is a pull arm, 114 is a PR arm, 115 is an S sub brake, 116 is a brake L, 117 is a brake R, 118 is a JOG arm, 119 is a tension arm, 120 is a tension band, 121 is a brake spring, and 122 is an S sub brake. A spring, 123 is a tension spring, and 125 is a slow spring.

In FIG. 6, 101 is a loading motor, 102 is a worm, 103 is a motor gear, 104 is a cam gear, 105 is a slider, 106 is a load gear L,
106a is a link L, 107 is a load gear R, 107a
Is a link R, 61 is a tape guide L, 62 is a tape guide R, 108 is a torque switching arm, 109 is a slow brake, 110 is a T operation arm, and 124 is a torque switching gear.

In response to the switching of the operation mode of the mechanism and the rotation of the loading motor 101 which is the driving source of the operation element, the rotation from the worm 102 rotating coaxially with the loading motor 101 to the cam gear 104 via the motor gear 103 is performed. Convey. The slider 105 has a rack portion (not shown) of the slider engaged with a gear portion (not shown) of the cam gear 104, and the cam gear 104
Slide according to the rotation of.

The member directly controlled by the cam gear 104 is a load gear L10 for driving the tape guide L61.
6. Load gear R10 for driving tape guide R62
7, the S sub-brake 115 and the tension arm 119. The members directly operated by the slider 105 include a torque switching arm 108 and a T operation arm 11.
0, drive gear 111, brake L116, brake R1
17, the JOG arm 118 and the T brake 13.

After the cassette is mounted, the missing portion (not shown) of the cam gear 104 is connected to the load gear L106 and the load gear R10.
7 and the load gear L106 is connected to the link L106a.
Through the link R107a.
Each drives the tape guide L61 and the tape guide R62.

In the above operation, the magnetic tape 1
The tape guide L61 and the tape guide R62 allow the magnetic tape 1 to jump out vigorously in the process of being pulled out of the cassette 20 and to apply a load to a hub (not shown) in the cassette 20 so that the tape does not sag. The S sub-brake 115 urged in the counterclockwise direction in the drawing by the S-sub spring 122 brakes the S reel base 11 via the tension band 120. On the other hand, at times other than the tape loading operation, the S sub brake 115
Is biased clockwise in the figure by a control groove (not shown) provided in the cam gear 104, and is at a position where no braking force is applied to the S reel base.

In the process of pulling out the magnetic tape 1 described above, the slider 105 slides in the direction of the arrow shown in the figure, and drives the drive gear 111 clockwise in the figure.
The drive gear 111 drives the PR relay gear 112 counterclockwise in the figure, and the PR relay gear 112 rotates the drawer arm 113 clockwise in the figure, and the magnetic tape 1 is pulled out of the cassette 20 by the drawer pin 113a. Drawn out.

Next, a PR elevating gear (not shown) meshing with the PR relay gear 112 is connected to the PR arm 11.
4 is lowered. After the PR arm 114 is lowered, P
The boss portion 114a of the R arm 114 is a PR relay gear 112
And the PR arm 114 is urged clockwise in the figure, whereby the magnetic tape 1 is sandwiched between the pinch roller 3 and the capstan 2a.

FIG. 1 is a plan view of a tape winding system during recording or reproduction. 1 is a magnetic tape, 2 is a capstan motor, 2a is a capstan, 2b is a capstan pulley,
3 is a pinch roller, 4 is a belt, 5 is a pulley section, 6 is a makitori gear, 12 is a T reel stand, 20 is a cassette, 30
Is a substrate. The magnetic tape 1 is pulled out of the cassette 20 mounted on the substrate 30 and wound around a cylinder 21 to perform recording and reproduction. The magnetic tape 1 is provided on the axis of the capstan motor 2, is sandwiched between a capstan 2 a rotating integrally with the capstan motor 2, and a pinch roller 3, and is rotated in a direction indicated by an arrow in FIG. It is transferred at a constant speed.

The rotation is transmitted to the capstan pulley 2a through a toothed belt 4 hung on a capstan pulley 2b provided integrally with the capstan motor 2, and the pulley 5 and a slip clutch mechanism (not shown) are transmitted. ) Is transmitted to the take-up gear 6. The rotation of the take-up gear 6 is transmitted from the gear 7 to the T-reel table 12 via the swing gear 8, and the magnetic tape 1 transported at a constant speed is taken up on a reel in the cassette 20.

During recording and reproduction, the tension arm 11
9 is urged in the counterclockwise direction in the figure by a tension spring 123, and a tension band 120 attached to the tension arm 119 applies a load to the S reel base 11, and a predetermined tension is applied to the magnetic tape 1 by the load. .

Next, the reverse reproduction will be described. In FIG. 2, the rotation is transmitted to the capstan pulley 2a via a toothed belt 4 hung on a capstan pulley 2b which rotates clockwise at a constant speed, and the rotation is transmitted via a pulley 5 and a slip clutch mechanism (not shown). The power is transmitted to the gear 6. The rotation of the take-up gear 6 is transmitted from the gear 7 via the swing gear 8 to the relay gear 9, and further from the relay gear 9 to the S reel table 11 via the relay gear 10, and is transferred at a constant speed. 1 is wound on a reel in the cassette 20.

At this time, the magnetic tape 1 is
In order to obtain a stable tape running state at the portion sandwiched between the a and the pinch roller 3, an appropriate tension is applied to the magnetic tape 1 on the side of the T-reel base 12 from the above-described sandwiching portion, that is, on the right side in the drawing. Need to give. For this purpose, the T sub-brake 13 is urged clockwise in the figure by the urging spring 14 to abut on the T reel base 12 at the position 50 to generate a load.

Further, at the time of reverse rotation reproduction, a cam (not shown) provided on the outer periphery of the cam gear 104 urges the tension arm 119 in the clockwise direction in FIG. 5 to separate the tension band 120 from the S reel base 11. By doing so, it is possible to prevent the tape winding load from increasing during reverse playback.

When shifting from the reproduction mode to the reverse rotation reproduction mode, the rotation direction of the capstan motor 2 changes from the counterclockwise direction to the clockwise direction, and at the same time, the magnetic tape 1 held between the capstan 2a and the pinch roller 3 is rotated. Changes from the forward direction to the reverse direction.

On the other hand, when the rotation direction of the capstan 2 is counterclockwise, as described with reference to FIG. 2, from the capstan pulley 2b, via the toothed belt 4, the pulley 5, the winding gear 6, and the gear 7, Swing gear 8 to which power is transmitted
Are in mesh with the T reel base 12 and transmit the driving force to the T reel base 12. From this state, when the rotation direction of the capstan 2 changes in the clockwise direction, the toothed belt 4, pulley 5, winding gear 6,
And the oscillating gear 8 to which power is transmitted via the gear 7 rotates counterclockwise in the figure around the center of the gear 7, but the oscillating gear 8 separates from the T-reel base 12, and the relay gear The power of the capstan 2 is not transmitted to the S-reel base 11 until the magnetic tape 1 is engaged with the magnetic tape 1 in the above-described manner. 20
The magnetic tape 1 is not wound up inside, and sags around the cylinder 21.

Therefore, when shifting from the reproduction mode to the reverse rotation mode, the JOG arm 118 is driven clockwise in the figure by the tension spring 123, and the JOG arm 118 drives the S reel base 11 counterclockwise. Then, the magnetic tape 1 transported in the reverse direction is wound into the cassette 20. When shifting to the reproduction mode again, the JOG arm 118 is urged counterclockwise in the figure by the outer peripheral cam of the slider 105 to be in a standby state.

During slow reproduction, the slow brake 109 urged by a slow spring (not shown) applies a braking force to the capstan 2 to prevent overrun due to intermittent feed of the capstan motor 2. In the mode (1), the slow brake 109 is operated by the drive gear 111 driven by the slider 105, is separated from the capstan motor 2,
No braking force is applied to the vehicle.

Next, high-speed winding / rewinding (hereinafter FF /
The mechanism state at the time of (REW) will be described. FF /
At the time of REW, the slider 105 is
, A torque switching gear 124 rotating coaxially and integrally with the gear 7 is operated to release the engagement between the torque switching gear 124 and the take-up gear 6, and a transmission gear (shown in the figure) rotating coaxially and integrally with the pulley 5. In this case, the driving force of the capstan motor 2 is transmitted directly from the pulley 5 to the gear 7 without passing through the clutch mechanism (not shown).

At this time, the slider 105 rotates the tension arm 119 clockwise in FIG.
Is separated from the S reel base 11 to prevent an increase in the tape winding load at the time of FF and an increase of the tape back tension at the time of REW.

Recording, reproduction, and FF / RE described above
In W, the control groove (not shown) of the slider 105 directly urges the brake R117 counterclockwise, and further urges the brake L116 clockwise via the brake R117, whereby the brake L116 is relayed. The relay gear 10 and the S reel base 1 are located at positions separated from the gear 9.
1, no braking force is generated, and the brake R117 is located at a position separated from the T-reel base 12, so that no braking force is generated on the T-reel base 12.

When the mode shifts from the FF / REW mode to the stop mode, the control groove (not shown) of the slider 105 releases the bias of the brake R117 by the movement of the slider 105, and the brake L116 is moved counterclockwise by the brake spring 121. The brake R117 is urged in the clockwise direction, and the brake L116 is connected to the relay gear 9 and the relay gear 10 via the relay gear 10.
The reel base 11 is braked, and the brake R117 brakes the T reel base 12.

Next, FIG. 3A is a cross-sectional view around the T-sub brake 13 corresponding to FIGS. 1 and 2 used in the above description.
It is shown in (B). Here, the switching gear 15 is urged by a compression spring 16 so as to be slidable in the vertical thrust direction, and meshes with the transmission gear 17 when in the state of FIG. It is transmitted to the switching gear 15 from the transmission gear 17 rotating integrally with the pulley 5 via the attached belt 4 and the pulley 5. Further, since the switching gear 15 is always meshed with the idler gear 18, and the idler gear 18 is meshed with the input gear 19 of the cassette mounting device, the rotation of the switching gear 15 is transmitted to the cassette mounting device via the idler gear 18. ing.

In all modes other than the cassette insertion / ejection mode, the T sub-brake 13 is at the position 50 separated from the T reel base 12 in FIG. 1 described above or the urging force applied to the T reel base 12 in FIG. The switching operation unit 13a is in the state shown in FIG. 3A interposed between the switching gear 15 and the substrate 30 at either of the generation positions 51, and in either of the positions. Push down the transmission gear 1
Since the meshing between the gear 7 and the switching gear 15 is cut off, the rotation of the capstan motor 2 is not transmitted to the switching gear 15 and power is not supplied to the cassette mounting device.

Next, FIG. 4 shows a plan view and a sectional view around the T sub-brake 13 when the cassette is inserted and ejected. When the cassette is inserted and ejected, the T-sub brake 13 is biased by the control member to the position shown in FIG.
a does not depress the switching gear 15 and
5 is urged upward by a compression spring 16 and meshes with the transmission gear 17. Therefore, as described above, the rotation of the capstan pulley 2b is controlled by the rotation of the toothed belt 4, the pulley 5, the transmission gear 17, which rotates integrally with the pulley 5, and the switching gear 15.
The power is transmitted to the input device 19 of the cassette mounting device via the and the idler gear 18, and power is transmitted to the cassette mounting device.

As described above, the T-sub brake 13
A magnetic recording / reproducing apparatus in which a T-sub brake can also be used as a power transmission member by switching power transmission from a capstan motor to a cassette mounting device between an operation range in which the T-sub brake is used as a braking member and another operation range. Is obtained.

[0035]

As described above, according to the present invention,
A simple and inexpensive mechanism can be obtained without providing a dedicated switching member for switching power transmission from the capstan motor to the cassette mounting device.

[Brief description of the drawings]

FIG. 1 is a plan view of a tape winding system of a magnetic recording / reproducing apparatus according to the present invention during recording / reproduction.

FIG. 2 is a plan view of the tape winding system of the magnetic recording / reproducing apparatus according to the present invention during reverse reproduction.

FIG. 3 is a cross-sectional view of the present invention.

FIG. 4 is a plan view and a cross-sectional view of the present invention.

FIG. 5 is a plan view at the time of recording / reproducing of the magnetic recording / reproducing apparatus according to the present invention.

FIG. 6 is a rear view of the magnetic recording / reproducing apparatus according to the present invention during recording / reproduction.

FIG. 7 is a plan view of a conventional magnetic recording / reproducing apparatus during recording / reproducing.

FIG. 8 is a sectional view of a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic tape 2 Capstan motor 2a Capstan 2b Capstan pulley 3 Pinch roller 4 Belt 5 Pulley 6 Winding gear 7 Gear 8 Swinging gear 9 Relay gear 10 Relay gear 11 S reel stand 12 T reel stand 13 T brake 14 Urging spring 15 switching gear 16 compression spring 17 transmission gear 18 idler gear 19 input gear 20 cassette 21 cylinder 30 substrate

Claims (2)

[Claims] 1. A magnetic recording / reproducing apparatus wherein a magnetic tape housed in a cassette is used as a recording medium, the magnetic tape is pulled out and wound around a rotary cylinder having a built-in magnetic head, and the magnetic tape is driven by a capstan. A braking member for applying a tape back tension during reverse playback by bringing the magnetic tape into contact with a reel base for supplying the magnetic tape during reverse playback or a gear drum directly connected to the reel base, and a cassette for inserting and discharging the cassette A mounting device, a capstan motor that generates a driving force and a tape driving force of the cassette mounting device, and separates the braking member from the reel base, within an operation range that does not generate a braking force on the reel base. A power transmission switch for switching power transmission from the capstan motor to the cassette mounting device using the braking member. A magnetic recording / reproducing apparatus comprising a replacement means. 2. A transmission gear for transmitting the power of a capstan motor, a switching gear sliding to a position meshing with and disengaging from the transmission gear, and a power transmission member of a cassette mounting device meshing with the switching gear. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the braking member for applying the tape back tension moves to a position where the transmission gear and the switching gear mesh with each other when the cassette mounting device is operated.