JPS61126651A - Reel turntable damping device of magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent damage and sag of a tape after movement of a reel turntable and to transport is stably and quickly by making the distance between a damping member and the driving reel turntable longer than that between a damping member and the reel turntable to be driven in accordance with the rotation direction of a driving member. CONSTITUTION:A pin 94 and a boss 95 are erected on a switching arm 101 turned around a shaft 102 supported axially on a substrate, and a felt 97 is stuck to this arm 101, and a switching gear 100 is rotated around the pin 94 and is pressed to the felt 97 by an elastic member 96. In the rewinding state, the rotation driving force rotates the gear 100 counterclockwise, and the arm 101 is tuned until the gear 100 and a supply reel base 6 are engaged with each other, and the boss 95 presses a side wall 91a of a brake supporting base 91, and a distance l1 between the turntable 6 and a brake 88 is longer than a distance l2 between a take-up reel turntable and a brake 89. In case of fast forwarding, a gear 99 is turned clockwise, and the boss 95 presses a side wall 91b of the turntable 91, and the gear 100 is engaged with the take-up reel turntable to transmit the rotation driving force, and the distance l1 is shorter than the distance l2.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention is suitable for a magnetic recording/reproducing device (tK), which can suppress damage to thin tape as much as possible, and also allows stable running with good responsiveness. The present invention relates to a reel stand braking device in a magnetic recording/reproducing device.

[Background of the invention]

A magnetic recording and reproducing device equipped with a rotating magnetic head and a magnetic head is busy, and in order to improve operability, it is possible to fast-forward or wind the magnetic tape with the magnetic tape wound around the rotating magnetic head, that is, with the loading completed. This is a return operation.

In a more rigid magnetic recording/reproducing device, for example,
As described in Publication No. 8-147855, when transitioning from 1 fast forward and rewind operation to stop mode, in order to stop tape feeding, a brake equipped with felt, rubber, etc. is applied to the outer circumference of the winding and supply reel stand. The two parts were quickly pressed together at the same time. However, the low 14 is like thin tape! During fast forwarding and rewinding of f8 straight when running an I-type tape, there is a tendency to set the reel stand height and tension low due to concerns about tape loss. As a result, since the tape is being driven with a slight slack, the tape remains slack even after the reel stand has stopped. When shifting to the playback mode from such a state, it takes a long time for the tape to reach a stable running state due to insufficient tape tension, and during that time, a good playback image cannot be obtained.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic recording and reproducing device that can prevent tape damage or tape sag after braking the reel stand after fast forwarding or rewinding, and can stably and quickly shift to the next mode. I'm busy.

[Summary of the invention]

A feature of the present invention is that when transitioning from fast forwarding and rewinding operations to stop mode, the timing of applying brake pressure to the reel stand is performed first from the driven side reel stand, and the brake pressure contact of the driving side 9-reel stand is performed first. The purpose is to prevent the tape from sagging when it is stopped by winding the tape during the tape path (by the inertial force of the drive-side reel stand).

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

The first figure is a schematic plan view of a rotary head type magnetic recording/reproducing device. Cassette 1 has supply reel 2° and take-up reel 5Vc
A magnetic tape 4 is wound therein. Said cassette 1
When the supply reel 2 is reloaded onto the substrate 5 at a predetermined position, the reel 3 is engaged with the reel stands 6 and 7, respectively. One tape pull-out member 8 has a guide roller 9. The guide bin 101 position regulating pin 11 is integrally attached to the guide roller 13. Guide bin 142 position regulation and 715 are integrally attached. Is the cassette IK the guide roller mentioned above? , 15. Guide pin 10.14 and outlet roller 16. Pinch roller 18 planted on pinch roller arm 17. An opening 20 is formed so that the guide bin 19 can be housed therein, and a magnetic tape 4 is stretched across the front surface of the FiN opening @20. When the cassette 1 is installed on the board 5,
The tape pull-out member 8.12 and the pull-out roller 16 are arranged along the guide grooves 21° 22.23K, respectively, in the stop members 24, 2.
u @ 246, 26a, 25th formed at 6.25
and the bottles 11 . which are set up on the tape pull-out members 8 and 12 .
The pinch roller arm 17 rotates around the shaft 27, and the magnetic tape 4 is pulled out until it engages with the shaft of the tension bin 28° pull-out roller 16 as shown in FIG. 16. Tilt bin 29. To full width erase, 30° impedance roller 31. Guide roller 9
．． Guide pin 10. The magnetic head is then wound around the rotary cylinder 32 containing the magnetic head at a predetermined angle, and then the guide pin 14. Guide roller 13. To the audio, do 36.
A traveling path passing through the guide bin 19 is formed, and the tape drawing operation, so-called loading, is completed. During recording and reproduction, the rotary cylinder 32 rotates from the loading completed layer, and the pinch roller 18 is integrally attached to the flywheel 35 that is rotated by the capstan motor 34 and is pressed against the capstan 36, and the magnetic tape 4 is A video signal is recorded or reproduced by feeding the magnetic tape 4 onto the magnetic tape 4. To fast forward or rewind, release the pinch roller 18 from the capstan 36.

This is done by rotating the reel stand 6I or 7 at high speed by the Yapstan motor 34. (Details of the drive mechanism will be shown later.

) FIG. 3 shows brake control a! of a magnetic recording/reproducing apparatus using an embodiment of the present invention. ! The composition diagram shows the mechanical arrangement in ``A'', fast-forwarding force, and rewind mode.

The driving source for mode switching is the loading motor 37.
The rotational driving force of the loading motor 670 is transmitted from the belt 40. Pulley 41. The signal is transmitted to the mode switching gear 38 via gears 42-48.

The mode switching gear 58 has a cam groove 49 as shown in FIG.
．． 50 is formed in the recesses of the cams 49 and 50, respectively, and the bottles 5 are mounted on arms 55 and 54 that rotate around shafts 51 and 52 that are pivotally supported on the base plate 5, respectively.
5.5 (5 is movably inserted.

Further, the bottles 55 and 56 are respectively inserted into elongated holes 704.1 ostL provided in the slider 70.105 shown in FIG. - Slide the shaft 1 (13, 104, 73) pivotally supported on the substrate 5.

The shapes of the sliders 70 and 105 are shown in FIGS. 11 and 12.

Mode switching is performed by transmitting the rotational driving force of the loading motor 37 to the mode switching gear 38 via the above-mentioned transmission path, and passing the pins 55 and 56 along the cams M49 and 50 (Figure 4) around the shirt) 51 and 52. Move slider 70. N:
I changed the position of J5 because I was busy, and the mode detection is the rotor that matches the mode switching gear 38! I'm deaf, f-
(not shown) electrically.

The reel stand driving source is the capstan motor 34, and this rotational driving force is transmitted from the belt 86 to the flywheel 35. A gear 87 integrally attached to the flywheel 35. gear 84
．． Goo attached integrally with gear 84! +85. Belt 82. Goo! J98. Gear 99 attached integrally with boo 998. The signal is transmitted from the switching gear 100 to the supply seal stand 6 or the take-up reel stand 7.

Next, the operation of transitioning from the fast forward and rewind states of FIG. 3 to the stop mode will be explained. When a command to shift to the stop mode is issued, the lobe ink motor 37 turns clockwise, and the rotational driving force is transferred to the mode switching gear 3 due to the aforementioned transmission path.
8 and turn counterclockwise. At the same time, the 1st gear 46 rotates counterclockwise as shown in FIG.
The sawtooth shape $57 formed in 6 pushes the member 58 downward. The member 58 has an elongated hole portion 58a formed therein, and a shaft 59°60.61 which is pivotally supported by the substrate slc in this elongated hole portion.
A pin 63 is inserted into the slider 62 which slides under the K-guide, and is attached with an E9 ring 64 so as not to come off. In addition, the member 58 pushes the slider 62 through the elastic member 65, and at the same time urges the slider 62 to rotate clockwise about the pin 63, and comes into contact with the bent protrusion 62a of the slider 62. Rotation around 763 and removal are prevented. When the gear 46 rotates counterclockwise, the serrated groove 57 pushes toward the member 58 and the long hole SaC, but when the gear 46 rotates clockwise, the serrated groove 57 pushes the member 58 toward the long hole SaC. Even if an attempt is made to engage them, they simply escape in the counterclockwise direction, and the elastic member 65 causes the bent protrusions 62a, 624i to return to their original positions. Conversely, when transitioning from stop mode to fast forward/rewind mode,
This is to prevent the lobe ink motor 37 from rotating counterclockwise and being braked. When the member 58 is pushed downward, the boss 66 erected on the member 58 pushes the arm 68 which is rotated by the pin 67 (FIG. 5) erected on the slider 62, and the arm 68 and the board are pushed together. It rotates counterclockwise due to the tensile force of the elastic member 62 stretched between the two. Then, the protrusion 568- of the arm 68 touches the slider 7.
The bent protrusion 704 of 0 and the elastic member 69 are disengaged from each other due to the tensile force, and the slider 62 is opened as shown in FIG.
It slides under the tensile force of elastic part #69 until it is crimped with a and 62d. When the slider 62 slides as described above, the member 58 that had been pushed downward is pulled by the tensile force of the elastic member 65, and the bent protrusion piece 6 of the slider 62 is pulled.
2a, move along 62411C, and connect pin 63 and elongated hole S.
When aW is pressed into contact with the elastic member 65, the tensile force of the elastic member 65 is maintained. Then, since the arm 68 is pulled by the elastic member 69, it rotates clockwise until it comes into contact with the bent protrusion piece 70a of the slider 70f, and after being oiled, it is held by the tension of the elastic member 69.

As described above, when the slider 62 moves by ILi to the position shown in FIG. 6, the cam groove 62 formed in the slider 62
4.62/', respectively, on the substrate 5) Arm 71.75.76 is the rotation center. A pin 72.75 planted on the brake control arm 77 rotates. As shown in the off-line diagram, the arm 71 is in contact with the side wall 714 of the arm 71 and the pin 80 set on the driving arm 74 due to the screw tension between the drive transmission arm 74 and the elastic member 79. The arm 71 has a belt 82 (
5), the brake control arm 77 rotates clockwise as shown in FIG.
8 and 89, the elastic member 81 rotates counterclockwise due to the tensile force of the elastic member 81. The gear 84 and pulley 8 are integrally attached to the bin 83 on the drive A74.
5 are pivotally supported, the arm 71 rotates clockwise as described above, and the gears 84 and 87 are disengaged, thereby cutting off the rotational driving force of the capstan motor 34. . Further, as shown in FIG. 1, when the brake control arm 77 rotates counterclockwise as described above, the board 5
One end 88a, 8? of a brake 88, 89 whose rotation center is a boss 92, 95 installed on a brake support stand 91 whose rotation center is a shaft 90 pivotally supported above. The boss 78 on the brake control arm 77 that was pressing the
8a and 89a, and due to the tensile force of the elastic member 81,
The brakes 88 and 89 press against the reel stands 6 and 7 to stop the reel stands.

FIG. 8 is a partial perspective view of the brake and drive switching section.

The switching arm 101 rotates around a shaft 102 that is pivotally supported on the substrate 5 (not shown in FIG. 8), and a pin 94 and a boss 95 are set on the switching arm 101, and a felt 97 is attached. It is being The switching gear 100 rotates around the pin 94 and is pressed against the felt 97 by an elastic member 96.

In the rewinding state, the rotational driving force of the capstan motor 34 rotates the switching gear 100 counterclockwise along the aforementioned movement path. At this time, the frictional force between the switching gear ioo and the felt 97 is approximately set to the load that causes the switching arm 101 to rotate.
rotates until the switching gear 100 and the reel base 6 engage, the boss 95 pushes the side wall 91g of the opening of the brake support base 91, and the brake support base 91 rotates clockwise around the shaft 90. As shown in FIG. 9, the distance between the reel stand and the brake is 21>λ2. The boss 95 pushes the brake support stand 91, and the brake support stand 91 pushes the gear 99.
After being fixed at the position shown in Figure 9 by zero rotational force, the rotational driving force of the capstan motor is larger than the frictional force between the switching gear 100 and the felt 97, so it is transmitted from the switching gear 100 to the reel stand 6. be done.

In the case of fast forwarding, the capstan motor 54 rotates in the opposite direction to rewinding, and the gear 99 rotates clockwise, so that the post 95 pushes the side wall 914 of the brake support 9 and the switching gear 100 rotates the reel. The rotational driving force of the capstan motor 34 meshes with the base 7, and the distance between the brake and the base 9 is as shown in FIG. 10 (1, t<12).

As shown in Figures 9 and 10, after setting the distance between the reel stand and the brake to be larger on the reel stand driving side (take-up reel stand for fast forwarding, supply reel stand for rewinding), go to stop mode. When shifted, gear 84 and gear 87 shown in FIG.
The capstan motor 34 is disengaged from the
At the same time, the 0 rotation driving force of the brake 88 is cut off.
89 tries to press the frill bases 6 and 7 by the tensile force of the elastic member 81. At this time, because the distance between the reel stand and the brake is different, the brakes are applied first from the non-drive side, and the brakes are applied later on the drive side.During the discrepancy in brake timing, the drive side reel is The tape is wound 9 from the inertial force, so that the tape stops under tension. Note that the distances f+ and It2 shown in the examples are experimentally determined (depending on the tape running path, the diameter of the seal stand, etc.).

〔Effect of the invention〕

According to the present invention, in a magnetic recording and reproducing bag that performs fast forwarding and rewinding while being loaded, fast forwarding and rewinding can be performed with low tape tension, thereby suppressing tape damage. After that, apply brake pressure to the reel stand and apply it to the non-drive side reel stand first, then apply it to the drive side reel stand later.By shifting the timing, you can eliminate tape sagging and increase the time required for stable tape running immediately after switching to playback mode. Since the time is shortened, it is possible to obtain a good image immediately after switching to playback mode.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the magnetic recording/reproducing device of the present invention, FIG. 2 is a plan view showing its loading state, FIG. 3 is a plan view showing details of mode transition, and FIG. is a plan view of the mode switching gear, FIGS. 5 and 6 are plan views showing the operation of the m-movement switching unit, OFF views are plan views showing the structure of the transmission switching member, and FIG. 8 is a perspective view of the brake control unit. , 9 and 10 are plan views showing the brake and drive units in the rewind and fast forward modes, respectively, and FIGS. 11, 12 and 13 are plan views of the sliders 62, 72 and 105. DESCRIPTION OF SYMBOLS 1... Cassette, 4... Magnetic tape, 6... Supply reel stand, 7... Number of turns 9-reel stand, 32... Rotating cylinder, 64... Capstan motor, 38... Mode switching gear, 62...Slider, 88.89...Brake, 91...Brake support stand, 98.99...
・Pulley, 100...Switching gear.

Claims (1)

[Claims] a first drive member that transmits the rotational driving force of the reel stand drive motor; a member that rotates coaxially with the first drive member; In a magnetic recording and reproducing device having a second drive member that switches and transmits drive to a predetermined reel base depending on the rotation direction, and a reel base braking member, a member movable according to the rotation direction of the second drive member. , the reel stand braking member is provided on the movable member, and the distance between the reel stand driven by the second driving member and the braking member is longer depending on the rotating direction of the first driving member. A reel stand braking device for a magnetic recording/reproducing device, characterized in that the distance is greater than the distance between a driving reel stand and the braking member.