JP2000339797A - Magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to decrease the number of parts and to improve space efficiency by connecting a band-like brake member which imparts friction brake to driving power transmission changeover and a take-up reel turntable and a driving power transmission changeover member at both ends of the brake member. SOLUTION: A spring manipulation arm 121 is energized clockwise by a slider and a tension spring 124 hooked between the spring manipulation arm 121 and a tension arm 119 generates 'strong' pulling load at the time of recording or reproducing. A tension band L120 which is mounted at the tension arm 119 and is held wound around a supply reel turntable 11 imparts load to the supply reel turntable 11 and imparts the prescribed tension to a magnetic tape 1. The control groove of the slider 105 directly energizes the manipulation arm 13 in a counterclockwise direction and a tension band R118 which is connected thereto and is held wound is loosened of the tightening by winding on the take-up reel turntable 12 side.

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. 8 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 pulley, 2b is a capstan pulley, 3 is a pinch roller, 4 is a belt, 5 is a makitori pulley, 41 is a makitori gear, 12 is a take-up reel table, 20
Denotes a cassette, and 30 denotes a substrate. The magnetic tape 1 is pulled out from the cassette 20 mounted on the substrate 30 and wound around a cylinder 21 to perform recording or reproduction. The magnetic tape 1 is provided on the axis of the capstan motor 2,
The capstan 2a, which rotates integrally therewith, is pinched by the pinch roller 3, and is transferred at a constant speed in a direction indicated by an arrow in FIG. Further, a capstan pulley 2 provided integrally with the capstan motor 2.
The rotation is transmitted to the pulley 5 via the belt 4 hung on the b, and through the gear 40 meshed with the gear portion 5a formed integrally with the pulley 5, the driving gear 42 of the slipper clutch mechanism 41 is transmitted to the driving gear 42. Is transmitted.

FIG. 9 is a cross-sectional view of a power transmission section 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 gear 42 and the driven member 43, and the rotation of the driven member 43 is transmitted by a friction force generated by compression of the spring 45. The gear 4 provided above the driven member 43
6. The rotation is transmitted to the take-up reel table 12 via the swing gear 8, and the magnetic tape 1 transported at a constant speed is taken up by the reel in the cassette 20 via the take-up reel table 12.

On the other hand, a switching gear 15 which can mesh with the gear portion 5a of the pulley 5 and can move up and down in the axial direction is arranged, and is urged by a compression spring 16 in a direction meshing with the gear portion 5a and the FL relay gear 18. ing. When the gear portion 5a and the switching gear 15 mesh with each other,
The rotation is transmitted to the input gear 19 of the cassette mounting device (not shown) via the FL relay gear 18.

Here, when the capstan 2a rotates clockwise in FIG. 8, that is, in the so-called normal rotation direction, the cassette mounting device operates in the cassette insertion direction, and when the capstan 2a is in the counterclockwise direction, that is, in the so-called reverse rotation direction. It is configured to operate in the cassette discharge direction. Then, in a mechanical mode 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), the meshing with the gear portion 5a is released, and the cassette mounting device (not shown). ) Is interrupted.

As described above, Japanese Patent Application Laid-Open No. 62-60156 discloses a known example of a magnetic recording / reproducing apparatus that drives a cassette mounting apparatus by the power of a capstan motor.

[0007]

However, in the above-mentioned prior art, a member for switching power transmission to the cassette mounting device is provided exclusively, so that the number of components is increased and the component layout is required due to the occupied space. There were problems such as the above restrictions.

An object of the present invention has been made in view of the above-mentioned problems, and a switching member for switching power transmission to a cassette mounting device is also used as another member.
An object of the present invention is to provide a magnetic recording / reproducing apparatus in which the number of components is reduced and the space efficiency is improved.

[0009]

To achieve the above object, a cassette mounting means for reciprocating a cassette containing a magnetic tape between a detachable first position and a recordable or reproducible second position. And a tape transfer means for transferring the magnetic tape in a state where the magnetic tape is pulled out and wound around a rotary cylinder on which a magnetic head is mounted at a predetermined angle, a supply reel table for supplying the magnetic tape, and winding the magnetic tape. A magnetic recording / reproducing apparatus comprising: a take-up reel base; a capstan motor which is a common power source of the tape transfer means and the cassette mounting means; A power transmission switching member for switching the power transmission to the mounting means; and a power transmission switching member wound around the take-up reel base to apply friction braking to the take-up reel base. And a control member for controlling the braking member. The power transmission switching member and the control member are connected at both ends of the braking member. The power transmission switching member switches the power transmission from the capstan motor to the cassette mounting means within an operation range for applying friction braking to the take-up reel table.

Further, by changing the relative position between the power transmission switching member and the control member and changing the winding of the braking member on the take-up reel table, two or more types of friction are applied to the take-up reel table. Added braking.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to FIGS.

FIG. 3 is an overall plan view of the magnetic recording / reproducing apparatus according to the present invention at the time of recording / reproducing. 1 is a magnetic tape, 2a
Is a capstan, 13 is a tension operation arm, 20 is a cassette, 30 is a substrate, 111 is a driving gear, 112 is P
R relay gear, 113 is a pull-out arm, 114 is a PR arm, 115 is a JOG arm, 116 is an operation arm L,
117 is an operation arm R, 118 is a tension band R,
119 is a tension arm, 120 is a tension band L, 121 is a spring operation arm, 122 is an operation arm spring, 123 is a JOG spring, 124 is a tension spring, and 125 is a slow spring.

FIG. 4 is an overall rear view of the magnetic recording and reproducing apparatus according to the present invention during recording and reproduction. 101 is a loading motor, 102 is a worm, 103 is a wheel gear, 1
04 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, 1
07a 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, and 110 is a torque switching gear.

According 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 worm 102 which rotates coaxially and integrally with the loading motor 101 rotates to the cam gear 104 via the wheel gear 103. Is transmitted. The slider 105 has a rack (not shown) in mesh with a gear (not shown) of the cam gear 104, and slides in accordance with the rotation of the cam gear 104.

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 JOG arm 115 and the tension arm 119.

The members directly operated by the slider 105 include a torque switching arm 108 and a drive gear 11.
1, an operation arm L116, an operation arm R117, a spring operation arm 121, and a tension operation arm 13.

After the cassette is mounted, the missing tooth 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.
And the load gear R107 is connected via the link R107a.
Each drives the tape guide L61 and the tape guide R62.

In the process of pulling out the magnetic tape 1 described above, the slider 105 of FIG. 4 slides in the direction of arrow C, and drives the drive gear 111 of FIG. 3 clockwise in the figure. This drive gear 111 is a PR relay gear 11
2 is driven counterclockwise in the figure, 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.

Next, a PR elevating gear (not shown) meshing with the PR relay gear 112 is connected to a PR arm 114.
Is lowered. After the PR arm 114 descends, 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 drawing, 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 at the time of recording / reproducing of the magnetic recording / reproducing apparatus according to the present invention. 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 toothed belt, 5 is a makitori pulley, 6 is a makitori gear,
Reference numeral 8 denotes a swing gear, 11 denotes a supply reel table, 12 denotes a take-up reel table, 13 denotes a tension operation arm, 20 denotes a cassette, and 30 denotes a substrate. The magnetic tape 1 is pulled out from the cassette 20 mounted on the substrate 30 and wound around a cylinder 21 to perform recording or reproduction. Magnetic tape 1
Is provided at the axis of the capstan motor 2 and is sandwiched between the capstan 2a and the pinch roller 3 which rotate integrally therewith. The capstan 2a is rotated at a constant speed in the counterclockwise direction by a constant speed in the direction of the arrow A in the figure. Transported by

Further, a toothed belt 4 is hung between a capstan pulley 2b provided integrally with the capstan motor 2 and a hatch pulley 5, and the rotation of the capstan motor 2 is performed via the toothed belt 4. Then, it is transmitted to the pulley 5 and transmitted to the gear 6 via a clutch mechanism (not shown) provided on the upper portion of the pulley 5. The rotation of the gear 6 is the torque switching gear 1.
10 through the FR drive gear 7 and the swing gear 8
The magnetic tape 1 transmitted to the take-up reel table 12 and transported at a constant speed is taken up on a reel in the cassette 20.

At the time of recording or reproduction, the spring operating arm 121 is urged clockwise by the slider 105, and the tension spring 12 hooked between the spring operating arm 121 and the tension arm 119.
No. 4 generates a "strong" tensile load. The tension arm 119 is urged by the tension spring 124 in a counterclockwise direction in the figure. The tension band L120 attached to the tension arm 119 and wound around the supply reel base 11 applies a load to the supply reel base 11, and a predetermined tension is applied to the magnetic tape 1 by the load. On the take-up reel table 12 side, a control groove (not shown) of the slider 105 is connected to the operation arm R117.
Is urged directly in the clockwise direction and the tension operation arm 13 is directly urged in the counterclockwise direction, and the tension band R118, which is connected to the tension operation arm 13 and is wound around the take-up reel table 12, is tightly wound around the take-up reel table 12. It is in a loose state.

Next, the reverse reproduction will be described.

FIG. 2 is a plan view of a tape winding system at the time of reverse reproduction of the magnetic recording / reproducing apparatus according to the present invention. Substrate 30
The magnetic tape 1 pulled out from the cassette 20 mounted thereon is wound around a cylinder 21 and sandwiched between a capstan 2a of a capstan motor 2 and a pinch roller 3, and is shown by a clockwise constant speed rotation of the capstan 2a. It is transported at a constant speed in the direction of arrow B. The rotation of the capstan motor 2, which rotates clockwise at a constant speed, is transmitted to the pulley pulley 5 via the toothed belt 4 hung on the capstan pulley 2b, and a clutch mechanism (shown in the drawing) provided on the upper portion of the pulley pulley 5 M) through the makitori gear 6
Is transmitted to Further, the rotation of the gear 6 is changed from the torque switching gear 110 to the FR drive gear 7 and the swing gear 8.
The magnetic tape 1 is transmitted to the relay gear 9 via the relay gear 9 and further to the supply reel table 11 via the relay gear 10, and is conveyed at a constant speed, and is wound on a reel in the cassette 20. At this time, in order to obtain a stable tape running state in a portion where the magnetic tape 1 is sandwiched between the capstan 2a and the pinch roller 3, it is necessary to set the magnetic tape 1 on the side of the take-up reel base 12 from the above-described holding portion, that is, on the right side in the drawing. It is necessary to apply an appropriate tension to the magnetic tape 1.

For this purpose, a tension band R118 is wound around the take-up reel base 12 to apply a load to the take-up reel base 12. An operation arm R117 and a tension operation arm 13 are connected to both ends of the tension band R118. During recording and reproduction, the operation arm R117 is urged clockwise and the tension operation arm 13 is urged counterclockwise by the control groove (not shown) of the slider 105, and the tension band R118 is moved to the take-up reel base 12
The tightening of the reel is loose and the take-up reel base 1
There is no load on 2.

When the operation mode shifts from the reproduction mode to the reverse reproduction mode, the operation arm R117 and the tension operation arm 13 are released from the urging by the control groove (not shown) of the slider 105, and the operation arm R117 is operated by the operation arm spring 1
22, the tension operation arm 13 is rotated counterclockwise.
Is rotated clockwise by the T operation arm spring 14. As a result, the tension band R118 is in a state of being tightly wound around the take-up reel table 12, applying a load to the take-up reel table 12, and applying an appropriate tension to the magnetic tape 1.

Further, at the time of reverse reproduction, the bias of the spring operation arm 121 by the slider 105 is released, and
It is rotated counterclockwise by the tension spring 124. Then, the attachment length of the tension spring 124 is shortened, and the tension spring 124 has a “weak” tensile load. The tension arm 119 is urged counterclockwise in the figure by the tension spring 124, but the urging force is reduced, and the load on the supply reel table 11 of the tension band L120 attached to the tension arm 119 is reduced. Become smaller. This prevents an increase in the winding load of the magnetic tape 1 on the supply reel table 11 during reverse playback.

Incidentally, the reverse reproduction is switched to the reverse reproduction by a command from a control unit (not shown) during the reproduction. 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 in the figure, and at the same time, the magnetic tape 1 pinched by the capstan 2 a and the pinch roller 3. Changes from the forward direction to the reverse direction.

On the other hand, when the rotation direction of the capstan motor 2 is counterclockwise, as described with reference to FIG. 1, the rotation of the capstan motor 2 is controlled by the capstan pulley 2b, the toothed belt 4, the makitori pulley 5, the makitori gear 6, The torque is transmitted to the swing gear 8 via the torque switching gear 110 and the FR drive gear 7. The swinging gear 8 is mounted on the take-up reel base 12.
, And the rotation is transmitted to the take-up reel table 12. When the rotation direction of the capstan motor 2 changes clockwise from this state, the oscillating gear 8 rotates counterclockwise around the center of the FR drive gear 7, but the oscillating gear 8 is 12 until it is engaged with the relay gear 9, the power of the capstan motor 2 is not transmitted to the supply reel base 11.
In the above description, the magnetic tape 1 transported in the reverse direction while being sandwiched between the capstan 2a and the pinch roller 3 is not wound on a reel in the cassette 20, and the magnetic tape 1 sags around the cylinder 21.

Therefore, when shifting from the regeneration mode to the reverse rotation mode, the cam gear 104 shown in FIGS.
J was urged in the counterclockwise direction by the cam
The urging of the cam gear 104 in the counterclockwise direction by the cam of the cam gear 104 is released, and the OG arm 115 is driven clockwise by the JOG spring 123. When the JOG arm 115 drives the supply reel table 11 in a counterclockwise direction, the magnetic tape 1 transported in the reverse direction is wound on a reel in the cassette 20. After that, the swinging gear 8 meshes with the relay gear 9, and the capstan motor 2
Is transmitted to the supply reel table 11, and the magnetic tape 1 transported in the reverse direction is wound up on a reel in the cassette 20. Also, when switching to playback mode again,
The JOG arm 115 is urged counterclockwise in FIG. 5 by the cam of the cam gear 104 to be in a standby state.
As described above, the reverse reproduction has been described, but the same operation is performed when shifting from the reproduction mode to the high-speed reverse reproduction mode, that is, the reverse search mode, and the clockwise rotation of the capstan motor 2 becomes the high-speed rotation.

Next, high-speed winding / rewinding (hereinafter referred to as FF / R
The mechanism state at the time of EW) will be described.

At the time of FF / REW, the slider 105 operates the torque switching gear 110 which rotates coaxially and integrally with the FR drive gear 7 via the torque switching arm 108, and releases the engagement between the torque switching gear 110 and the makitori gear 6. By engaging the torque switching gear 110 with the transmission gear 17 which rotates coaxially with the pulley 5, the driving force of the capstan motor 2 does not pass through the clutch mechanism (not shown) from the pulley 5, and the FR drive gear 7 directly.

The spring operating arm 121 is released from the bias of the slider 105, and is rotated counterclockwise by the tension spring 124. Then, the attachment length of the tension spring 124 is shortened, and the tension spring 124 has a “weak” tensile load. The tension arm 119 is connected to the tension spring 12.
4, it is urged counterclockwise in the figure,
This urging force is reduced, and the tension arm 119
The load of the tension band L120 attached to the supply reel table 11 is also reduced. Therefore, the tape back tension at the time of FF and the tape winding load at the time of REW can be reduced, and the tension pin 11 of the tension arm 119 can be reduced.
FF / REW can be performed while 9a is in contact with the magnetic tape 1, and a stable FF / REW is performed by the tension servo mechanism.
REW can be speeded up.

On the take-up reel table 12 side, the slider 105
Control groove (not shown) directly urges the operation arm R117 in the clockwise direction and the tension operation arm 13 in the counterclockwise direction, and connects the tension arm R117 to the tension arm R117 in a state wound around the take-up reel base 12. Is in a state where the tightness of the winding on the take-up reel base 12 is loose.

When the mode is shifted from the FF / REW mode to the stop mode, the spring operating arm 121 is urged clockwise by the slider 105 on the supply reel base 11 side, and the spring operating arm 121 is moved between the spring operating arm 121 and the tension arm 119. Hung tension spring 12
No. 4 generates a "strong" tensile load. The tension arm 119 is urged in the counterclockwise direction in the figure by the tension spring 124, and is attached to the tension arm 119, and the tension band L120 wound around the supply reel base 11 is moved to the supply reel base 11
, A frictional braking is applied to the supply reel base 11 to stop. On the take-up reel base 12 side, the operation arm R11
7 and the tension operation arm 13 are released from the urging by the control groove (not shown) of the slider 105, and the operation arm R1
17 rotates counterclockwise by the operation arm spring 122, and the tension operation arm 13 rotates clockwise by the T operation arm spring 14. As a result, the tension band R118 is in a state of being tightly wound around the take-up reel base 12, applying a load, that is, friction braking to the take-up reel base 12, and stopping the take-up reel base 12.

Next, power transmission from the capstan motor 2 to the cassette mounting device will be described. FIG. 6 is a plan view when the cassette is inserted and ejected, and FIG. 7 is a partial cross-sectional view when the cassette is inserted and ejected. The power of the capstan motor 2 is transmitted to the pulley 5 via the toothed belt 4 and transmitted to a transmission gear 17 which rotates integrally with the pulley 5. Reference numeral 15 denotes a switching gear slidably mounted in the vertical thrust direction. When the cassette is inserted and ejected, the switching gear 15 is urged upward by a compression spring 16 and meshes with the transmission gear 17. Further, the switching gear 15 is always meshed with the FL relay gear 18,
Since the L relay gear 18 meshes with the input gear 19 of the cassette mounting device, the motive power of the capstan motor 2 is the capstan pulley 2a, the toothed belt 4, the makitori pulley 5, the transmission gear 17, the switching gear 15, the FL relay gear 18 ,
It is configured to be transmitted to the cassette mounting device via the input gear 19.

The insertion of the cassette 20 is performed by a user.
When the cassette 20 is inserted into a cassette holder (not shown) of the cassette mounting device and further pushed to a certain position, an FL switch (not shown) is pressed, and a control unit (not shown) of the magnetic recording / reproducing device is pressed. ), The capstan motor 2 rotates clockwise. The power of the capstan motor 2 is transmitted to the cassette mounting device through the above-described path, and the cassette 20 is transferred to a position where recording or reproduction can be performed. At this time, the power of the capstan motor 2 is
The wind is also transmitted from the pulley pulley 5 to the take-up reel base 12 via the makitori gear 6, the torque switching gear 110, the FR drive gear 7, and the swinging gear 8, and the take-up reel base 12 rotates. Alternatively, when mounted at a position where reproduction is possible, the reel in the cassette 20 and the take-up reel base 12 smoothly engage with each other. When the user presses the eject button to eject the cassette 20, a command is issued from a control unit (not shown) of the magnetic recording / reproducing apparatus, and the capstan motor 2 rotates counterclockwise. The power of the capstan motor 2 is transmitted to the cassette mounting device along the same path as when the cassette is inserted, and the cassette 20 is transported from a position where recording or reproduction is possible to a position where the cassette can be detached. At this time, the power of the capstan motor 2 is transmitted from the pulley 5 to the
The power is transmitted to the supply reel table 11 via the drive gear 7, the swing gear 8, the relay gear 9, and the relay gear 10, and the supply reel table 11 rotates counterclockwise. Therefore, cassette 2
At the time of ejection of 0, the magnetic tape 1 in the cassette 20 rotates counterclockwise for a little while the reel in the cassette 20 is disengaged from the supply reel base 11, and there is a concern that the magnetic tape 1 becomes slack. Is done. To prevent this, it is necessary to apply an appropriate load to the take-up reel base 12, and the tension band R118 and the tension operation arms 13 and the operation arms R117 connected to both ends of the tension band R118 apply the load to the take-up reel base 12. Giving friction braking.

FIG. 5 is a sectional view of the periphery of the tension operation arm 13 when the cassette is not inserted or ejected. In all modes except when the cassette is inserted and ejected, the tension operation arm 13
As shown in FIG. 1, when the tension band R118 is tightly wound around the take-up reel base 12 at the loose position 50 as in the reproduction or FF / REW, as in the case of the reverse reproduction or the stop in FIG. The tension band R118 is at one of the positions 51 where the take-up reel base 12 is wound up.
The switching operation section 13a of the tension operation arm 13 is in a state of being sandwiched between the switching gear 15 and the substrate 30 irrespective of the position of the tension operation arm 13. That is, the switching operation unit 13a of the tension operation arm 13
Pushes down the switching gear 15 which has been urged upward by the compression spring 16 to disengage the switching gear 15 from the transmission gear 17. As a result, the power of the capstan motor 2 is not transmitted to the switching gear 15, and power is not supplied to the cassette mounting device.

At the time of cassette insertion / ejection, as shown in FIG. 6, the tension operation arm 13 is positioned at a position where the tension of the tension band R118 on the take-up reel base 12 is further loosened from the position 50 by the cam portion of the slider 105. 52. However, tension band R1
Operation arm R117 connected to the opposite side of
Since the tension band R118 is located at a position where the take-up reel table 12 is tightened, a weak friction braking can be applied to the take-up reel table 12, and as described above, the slack of the magnetic tape 1 at the time of discharging the cassette can be prevented. ing.

Further, the switching operation portion 13a of the tension operation arm 13 is urged upward by the compression spring 16 without pushing down the switching gear 15, and meshes with the transmission gear 17. Therefore, as described above, the power of the capstan motor 2 is supplied to the cassette mounting via the capstan pulley 2a, the toothed belt 4, the hatch pulley 5, the transmission gear 17, the switching gear 15, the FL relay gear 18, and the input gear 19. It is transmitted to the device.

As described above, the tension operation arm 13 is connected to the tension band R118 and the operation arm R11.
7, and can be used as a braking member for the take-up reel table 12, and the tension operation arm 13 can also be used as a switching member for switching power transmission from the capstan motor 2 to the cassette mounting device.

[0042]

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 during recording and reproduction of a magnetic recording and reproducing apparatus according to the present invention.

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

FIG. 3 is an overall plan view at the time of recording / reproducing of the magnetic recording / reproducing apparatus according to the present invention.

FIG. 4 is an overall rear view of the magnetic recording / reproducing apparatus according to the present invention during recording / reproduction.

FIG. 5 is a partial cross-sectional view of the magnetic recording / reproducing apparatus according to the present invention, except when a cassette is inserted and ejected.

FIG. 6 is a plan view of the magnetic recording / reproducing apparatus according to the present invention when a cassette is inserted and ejected.

FIG. 7 is a partial cross-sectional view of the magnetic recording / reproducing apparatus according to the present invention when a cassette is inserted and ejected.

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

FIG. 9 is a partial 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 ... Toothed belt, 5 ... Makitori pulley, 6 ... Makitori gear, 7 ... FR drive gear, 8 ... Neck Swing gear, 9
... Relay gear, 10 ... Relay gear, 11 ... Supply reel stand, 1
2 ... take-up reel base, 13 ... tension operation arm, 1
4 ... T operation arm spring, 15 ... Switching gear, 16 ...
Compression spring, 17: transmission gear, 18: FL relay gear, 19: input gear, 20: cassette, 21: cylinder, 30: substrate, 104: cam gear, 105: slider, 108: torque switching arm, 110: torque switching gear , 116 ... operation arm L, 117 ... operation arm R, 1
18: tension band R, 119: tension arm, 120: tension band L, 122: operation arm spring.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masaki Uesugi 1410 Inada, Hitachinaka-shi, Ibaraki F-term in the Digital Media Products Division, Hitachi, Ltd. 5D081 AA07 DD05 EE08

Claims (2)

[Claims] A cassette mounting means for reciprocating a cassette accommodating a magnetic tape between a first position at which the magnetic tape can be attached and detached and a second position at which recording or reproduction is possible; A tape transfer means for transferring the magnetic tape while being wound at a predetermined angle around a rotary cylinder on which a magnetic tape is mounted; a supply reel table for supplying the magnetic tape; a take-up reel table for winding the magnetic tape; And a capstan motor that is a common power source of the cassette mounting means and is driven to rotate forward and backward,
A power transmission switching member for switching power transmission from the capstan motor to the cassette mounting means; wound around the take-up reel base to apply friction braking to the take-up reel base. It has a band-shaped braking member, and a control member for controlling the braking member. The power transmission switching member and the control member are connected at both ends of the braking member. A magnetic recording / reproducing apparatus, wherein the power transmission switching member switches power transmission from the capstan motor to the cassette mounting means within an operation range for applying friction braking to the take-up reel table. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein a relative position between the power transmission switching member and the control member is changed to change the winding of the braking member around the take-up reel base. A magnetic recording / reproducing apparatus, wherein two or more types of friction braking are applied to the take-up reel table.