JPH01208755A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To simplify the braking mechanism of a recorder and reproducing device and, at the same time, to realize delicate brake control by using an electromagnetic braking means to a winding-side or feeding-side reel turntable. CONSTITUTION:A reel hub engaging click 5 is engaged with the reel hub of a cassette and rotates as a magnetic tape is pulled out. When the click 5 rotates, a reel turntable 8 also rotates. When a voltage regulator 10 supplies an electric current to a coil 1, a magnetic field which resists the rotation of the reel turntable 8 is produced around a movable iron core 44. When the voltage of the voltage regulator 10 is changed, the intensity of the magnetic field produced between the iron core 44 and a magnetic ring 7 made of a magnetic substance changes and the braking torque to the reel turntable 8 is changed. Moreover, when a high voltage is applied across the coil 1, the iron core 44 is attracted by the magnetic ring 7 and acts as a stopping brake of the turntable 8. Therefore, the braking mechanism is simplified and, at the same time, the braking torque can be controlled delicately in such a way that no damage is given even to a thin magnetic tape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording/reproducing apparatus having a device for winding a band-shaped carrier from one reel to the other reel.

[Prior Art] Fig. 4, Fig. 5, and Fig. 6 show a conventional varactor tension applying mechanism and tape running stop mechanism of a recording/reproducing device, and Fig. 4 shows a take-up reel stand unit. , 8 is a (take-up) reel stand, 5 is a reel hub engaging claw for the cassette, 4 is a reel stand shaft, 6 is a reel cap, 2 is a biasing spring for the reel hub engaging claw 5, and 40 is a brake for rewinding inertia braking. , 13 is a thrust stop ring. Figure 5 shows the supply reel stand unit, 8 is the (supply) reel stand,
Components with the same reference numerals as in FIG. 4 indicate the same components, or 32 indicates a fast-forward inertia braking play.-133 indicates a band brake for hack tension control.

Back tension torque adjustment of a reel stand in a conventional recording/reproducing apparatus was performed using a plurality of mechanical brakes in a manner as shown in FIG. 6.

In FIG. 6, 5 is a reel hub engaging pawl, 8 is a reel stand, 12 is a spring that biases the tension arm 15, 14.
16.23, 27.29 are guide posts, 15 is a tension arm, 17 is a full width erase head, 1B, 19, 2
1. 22 is the loading post, 20 is the rotating rad tram, 24 is the audio erasing head, 25 is the audio recording/playback head, 26 is the control head, 28 is the capstan,
30 is a pinch roller, 43 is a magnetic tape which is a strip carrier, 31 is a cassette, and 32 is a ? Brake for feed inertia braking,
33 is a handbrake for controlling hack tension, and 35 is a recording/playback brake.

36 is a main brake on the supply side, 39 is a main brake on the winding side, 40 is a brake for rewinding inertia braking, and 42 is a rewinding regeneration brake.

By the way, in order for the recording and reproducing apparatus shown in FIGS. 4 to 6 to operate, loading, recording/reproducing, fast-forward playback, 9-rewind playback, and fast-forward 9-rewind playback are required.

The aforementioned mechanical brakes must be operated for each mode of unloading and stopping, respectively. This brake operation is performed by either pulling out the magnetic tape from the cassette using the loading posts 18, 19° 21.22 and winding it around the rotating head drum 20 in the loading mode, or pulling out the magnetic tape from the supply reel. Therefore, the winding side main brake 39 is kept in a braking state, and the fast forward inertia braking brake 32 is operated so that the supply side reel stand rotates due to inertia and the magnetic tape does not loosen when loading is completed. Next, record
In the playback mode, the magnetic tape is pulled out from the supply reel at a constant speed by the capstan and the pinch roller. At this time, the recording/playback brake 35 is operated to obtain stable tape tension, and the tension arm 15, the actual tension is detected and the hack tension control handbrake 33 is used to eliminate tension fluctuations due to changes in the tape winding diameter. In addition, the pack tension brake is applied in the fast forward playback mode in the same way as in the recording/playback mode, and in the rewind playback mode, the capstan and pinch roller are applied from the take-up reel to the normal recording/playback mode. Either the tape is pulled out at a faster speed than the above speed and wound onto the supply reel, or the rewinding and reproducing brake 42 is applied at this time. Further, in the fast forward mode, a fast forward inertia braking brake 32 is applied to prevent the tape from loosening when the tape stops running, and in the rewinding mode, a rewinding inertia braking brake 40 is similarly applied. Next, at the time of unloading mode, the loading posts 18, 19, 21, 22 are stored in the recesses on the entire surface of the cassette, and at this time, the tape is wound onto the supply reel, and the main brake 39 on the take-up side is applied to the take-up reel stand. I'll keep it. Finally, in the stop mode, both main brakes 39 and 36 on the winding side and the supply side are respectively activated.

[Problem to be solved by the invention] As mentioned above, the conventional mechanism had the disadvantage that multiple mechanical brakes had to be switched and operated for each mode, making the mechanism extremely complicated. Therefore, this invention
In order to eliminate these drawbacks, the purpose of this invention is to simplify the brake mechanism of the reel stand.

[Means for Solving the Problems] In order to achieve the above-mentioned objects, the present invention simplifies the brake mechanism by configuring the brake of the reel stand by electromagnetic means in a recording/reproducing device using a band-shaped carrier. In addition, the brake torque can be delicately controlled so as not to damage thin magnetic tapes such as those used in recent magnetic recording and reproducing devices.

[Function] By using an electromagnetic brake means on the take-up side or supply side reel stand, the brake mechanism can be simplified, and
By adjusting the voltage supplied to the electromagnetic brake means by 3 g, delicate brake torque control can be achieved.

[Example] FIG. 1 is the drawing that best represents this invention.

FIG. 2 is a plane view taken along the line B-Bl in FIG. 1. FIG. 3 is a schematic plan view of a rotary head type magnetic recording/reproducing device which is an example of a device to which the electromagnetic brake means of the present invention can be applied to a reel stand.

In FIG. 1, l is a coil, 2 is a reel collar engaging claw 5
, 4 is a reel base shaft, 5 is a reel hub engaging claw for the cassette, 6 is a reel cap, 7 is a magnetic ring, 8 is a reel base, 9 is an electromagnetic unit receiver, 1O is a voltage regulator, 11 is a Coat, 13 is thrust stop ring, 44
is a movable iron core, and 45 is an iron core biasing spring. In Figure 3, 14, 16, 23, 27.29 are guide posts,
15' is the tension arm pin, 17 is the full width erase head, 18, 19, 21.22 is the rope ink post, 2
0 is the rotating drum, 24 is the sound erasing head, 25
is the audio recording/playback head, 26 is the control head,
28 is a capstan, 30 is a pinch roller, 31 is a cassette, and 43 is a magnetic tape.

In this invention, since the reel hub engaging pawl 5 engages with the reel hub of the cassette, it rotates as the magnetic tape 43 is pulled out. The protrusion of the reel stand 8 is hexagonal, and the hole of the reel huff engaging claw 5 is formed on the reel stand 8.
It is slightly larger than the hexagonal shape of the protrusion.

Therefore, as the reel hub engaging pawl 5 rotates, the reel stand 8
Rotate 6 times. When a current is passed through the voltage regulator 10 or the coil 1, a magnetic field is generated around the movable iron core 44, which acts as a resistance to the rotation of the reel stand 8. By changing the voltage of the voltage regulator 10, the strength of the magnetic field generated between the movable iron core 44 and the magnetic ring 7 changes, and the resistance to rotation of the reel stand 8 also changes.

In other words, the brake torque of the reel stand 8 changes.

Furthermore, when a high voltage is applied to the coil l, the movable iron core 44 is attracted to the magnetic ring 7, lifts up against the iron core biasing spring 45, and becomes attracted to the magnetic ring 7, stopping the reel stand 8. It becomes a brake.

If this reel stand unit is used, only this electromagnetic braking means is required instead of the braking means for adjusting the reel stand torque, which was required in plural for one reel stand.

In addition, in the device shown in Fig. 3, if you want to keep the tension of the drawn tape constant, you can detect the actual tension of the tape using the tension arm bin 15', and then adjust the voltage regulator l.
By feeding this information to O, it is possible to easily control the tape tension.

FIGS. 7 and 8 show other embodiments of the present invention. 3 is a friction material such as felt, and the friction material 3 is sandwiched between an iron core 46 and a magnetic ring 7. FIG. 8 is a sectional view taken along the line AA in FIG. 7.

When the reel in the cassette 31 is rotated, the reel stand 8 is rotated via the reel huff engaging pawl in the same manner as in the embodiment shown in FIG. When a current is applied to the coil 1 by the voltage regulator 10, the magnetic ring 7 fixed to the reel stand 8
is attracted to the iron core 46, and a brake torque is generated in the friction material 3 between the magnetic ring 7 and the iron core 46.

This is an attempt to simplify the structure shown in FIG.

In addition, this friction material 3 may include felt, leather 2, etc.
Synthetic leather, polyslider such as Teflon, rubber, etc. can be used.

[Effects of the Invention] As explained above, the brake of the reel stand can be made simple by using an electromagnet and a magnetic material, and the brake torque can also be changed as necessary. By not using mechanical braking means, the operation control system is also simplified, and the braking torque can be controlled over a wide range and accurately in terms of functionality.

[Brief explanation of the drawing]

FIG. 1 is a side half sectional view of a reel stand unit which is an embodiment of the present invention, FIG. 2 is a side view taken along line BB in FIG. 1, and FIG. FIG. 4 is a side sectional view of a conventional take-up reel unit, FIG. 5 is a side half sectional view of a conventional supply reel unit, and FIG. 6 is a conventional 7 is a side half sectional view of a reel stand unit showing another embodiment of the present invention, and FIG. 8 is a sectional view taken along line AA in FIG. 7. . In the figure. l: Coil 2: Reel hub engaging claw biasing spring 3: Friction material 4: Reel mating shaft 5: Reel hub engaging claw 6: Reel cap 7: Magnetic ring 8: Reel stand 9: Electromagnetic unit receiver 10: Voltage adjustment device 11, court 12: tension arm biasing spring l3 varnish stopper ring 15: tension arm 3I: cassette 32: fast forward inertia braking brake 33: back tension control band brake 34: recording/playback brake biasing spring 35: recording/ Regeneration brake 36: Supply side main brake 37: Supply side main brake biasing spring 38: Winding side main brake biasing spring 39: Winding side main brake 40:! i3 rewinding to the inertia braking brake 4 rewinding regeneration brake biasing spring 42: rewinding regeneration brake 43: belt-shaped carrier (rj1 air tape) 44: movable iron core 45
:Iron core biasing spring 46:Iron core agent Patent attorney 1) Kitatake, Figure 6, Figure 7;, '; Figure 8

Claims (1)

[Claims] 1. A recording/reproducing apparatus using a band-shaped carrier, characterized in that a take-up reel stand or a supply reel stand of the recording/reproducing apparatus using a band-shaped carrier is provided with electromagnetic means for controlling the brake torque of the reel stand.