JPS5864661A - Reel turntable device of magnetic tape device - Google Patents

Abstract

PURPOSE:To run a tape stably by placing a slip load on a payoff reel turntable only during recording and reproduction, and thus applying adequate back tension to a running magnetic tape. CONSTITUTION:Latch levers 108 and 110 which have pawls 112 and 114 capable of freely engaging and disengaging from tooth parts of bodies 96 and 98 of revolution coupling with reel hubs are energized invariably clockwise by torsion springs to maintain the engaged states. Then, a payoff reel turntable means 84 of feeding a magnetic tape at a specified speed as shown by an arrow 400 in forward recording and playback mode and a payoff reel turntable means 82 of feeding the tape as shown by an arrow 402 in backward recording and playback mode rotate with latch levers 110 and 108 in operation states while generating slip loads. Consequently, adequate back tension is applied to the magnetic tape, which runs stably.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reel stand device for a magnetic tape device that is capable of forward and reverse recording/reproduction, and an object of the present invention is to have a simple configuration and supply a reel stand only during recording/reproduction. The objective is to generate a slip load on the tape and apply appropriate pack tension to the running magnetic tape to realize stable tape running.

Embodiments of the present invention will be described in detail below with reference to the drawings.

The present embodiment is applied to a magnetic tape apparatus having a power drive system in which the tape running mode is switched using motor power, and also has a so-called dual cab stand table running system capable of auto-reversing. Figures 1 and 2 are plan views showing this embodiment, Figure 3 is a side view, Figures 4 and 6 are half-views of main parts, and Figures 1, 2, and 3 are tape Both of them show a stop mode as the running mode.

The chassis 2 includes a cassette 4 containing a magnetic tape 6 wound around a pair of reel knobs (shown in the figure), a recording/reproducing head 8, two erasing spatulas (10.12), and a feeder for the magnetic tape 6. A tape running means for performing the above operations and an operating means for switching the operation of the tape running means are respectively disposed in a fixed or movable state.
The figure mainly shows the structure of the tape running means, and FIG. 2 mainly shows the structure of the operating means.

The motor chassis 14 fixed to the chassis 2 has a pair of capstans 16.1 which can be electrically switched between forward and reverse directions.
Capstan motors 2o and 2275Z are provided to directly drive the motors 8 in the same rotational direction.

The pinch rollers 24 and 26 are rotatably supported on pinch roller support shafts 36 and 38 that are mounted on pinch roller arms 32 and 34 that are rotatable about support shafts 28 and 30, respectively, as will be described later. In this manner, the magnetic tape 6 is driven at a constant speed in cooperation with the capstans 16 and 18.

The head substrate 40 on which the respective magnetic heads 8, 10, and 12 are mounted is configured to be able to slide freely on the chassis 2 in the directions of arrows 404 and 406, and is constantly moved in the directions of arrows 406 by return and rotation (not shown). energized in the direction.

The actuators 42, 44 are rotatably supported on support shafts 50, 52 installed below the head substrate 4o (towards the back of the page), and are fixed on the head substrate 4o in the same way as their tips 46, 48. A compression spring 58.60 is bridged between the pin 64.58 and the pin 64.58. These compression springs 58.
60, actuators 42, 44 are energized counterclockwise and clockwise, respectively, and the other end 62
, 64 are planted on the head substrate 40/<86.
68. The pinch roller arm 32 is inserted into the fitting holes 74 and 76, which are constituted by the actuators 42 and 44 and the square holes To and 72 formed on the head substrate 40.
．． Drive shafts 78 and 80 are fitted in the pinch roller arms 32 and 34 and project downward, so that the pinch roller arms 32 and 34 can integrally rotate as the head substrate 40 moves. In addition, in the stop mode shown in FIG. 1, the pinch roller arms 32, 34 are not subjected to the urging force of the compression spring,
It is biased together with the forward board 40 to a position away from the cassette 4 by a forward return spring (not shown).

The first and second reel stand means 82.84 are rotatably supported on a pair of reel shafts 86.88 mounted on the motor chassis 14, and the magnetic tape 6.
winding or supplying. In addition, the first and second
Since the reel stand means 82 and 84 have exactly the same configuration,
Here, the configuration and operation of the first reel stand means 82 will be explained.

67.- As shown in FIG.
The first one has an engaging claw 94 that engages with a loop (not shown).
A rotating body 9o and a second rotating body 96 having a plurality of uneven teeth 1oO on the outer periphery are rotatably supported by a reel shaft 86, and a slip mechanism 104 made of felt or the like is disposed between them. It is set up. An idler 134, which will be described later, selectively contacts the outer periphery of the first rotating body 9o, and the power of the reel motor 136, which can be switched between forward and reverse directions, is selectively transmitted to the first reel stand means 8o. The first latch lever 10B, which has a pawl 112 that can be freely engaged and disengaged from the tooth portion 100, is always urged clockwise by a torsion spring (not shown) so as to maintain the engaged state. In this state, even if the first rotating body 90 is rotated, the second rotating body 96 is prevented from rotating in the same direction, and both generate a constant slip load and perform relative motion. However, the first latch lever 108 is rotated counterclockwise against the spring force, and the mold 11 is rotated counterclockwise against the spring force.
When the locking state of the latch lever 2 and the tooth portion 1oo is released (hereinafter, when both are in the engaged state, the latch lever of 17. ), the first rotating body 90 and the second rotating body 96 are rotatable together.

Note that the relationship between the second latch lever 110 and the second reel stand means 78 is the same as the relationship between the first latch lever 108 and the first reel stand means 80, so a description thereof will be omitted.

As will be described later, the first and second latch levers 108,
110 are both inoperative, allowing the first and second reel platform means 82, 84 to rotate without internal slip loads.

However, there is a forward recording/reproducing mode in which the magnetic tape 6 is sent at a constant speed in the direction of arrow 400 (hereinafter referred to as forward mode).
A second reel stand means (supply reel stand means) 84 in
The first reel stand means (supply reel stand means) 82 in the opposite direction recording/playback mode (reverse mode) in which the data is sent in the direction of the arrow 402 is connected to the second and first latch levers 110,
By putting the 1o8 into the operating state, a slip load is generated and the motor rotates. This is to add an appropriate so-called back tension to the magnetic tape 6 in the forward/reverse mode, thereby realizing stable tape running.

The idler means 120 is rotatably supported on a support shaft 122, and is connected to an idler lever 126, which is always biased counterclockwise by an idler spring 124, so as to be swingable in the directions of arrows 40B and 410 about a support shaft 128. An idler support plate 130 is installed, an idler 134 is rotatably supported on a support shaft 132, and an idler 134 is disposed between the idler support plate 130 and the idler 134, and a constant load is applied during rotation. It consists of a friction member (not shown) that provides

Next, the operation of this idler means 120 will be briefly explained. In the stop mode, the idler 134 is biased by a cam follower 152 constituting an operating means (to be described later) to a position where it is separated from the boot IJ-140 fixed to the rotating shaft of the reel motor 136, and the reel motor 13
6 is powered by the first and second reel stand means 82.8.
4 (hereinafter referred to as idler 1 to 4 inactive state).

Therefore, for example, when it is desired to feed the magnetic tape 6 in the direction of the arrow 400 (forward mode, fast-forward mode, etc.), the reel motor 136 is rotated counterclockwise and the restriction by the cam follower 162 of the idler lever 126 is released. As a result, since the idler 134 has a rotational load as described above, after coming into contact with the pulley 140 of the reel motor 136, the idler 134 is displaced in the direction of the arrow 40B by the motor driving force and the first reel stand means 82 is moved. It contacts the outer periphery of the rotating body 9 degrees. Conversely, the magnetic tape 6 is placed in the direction of the arrow 402.
When sending the reel motor 136 clockwise, the idler 134 is brought into rolling contact with the outer periphery of the first rotating body 92 of the second reel stand means 84.

In the stop mode of the brake 142, a brake rubber 144 fixed to the tip of the brake spring 146 is attached to the brake spring 146.

Therefore, it is pressed against the first and second reel stand means 80.82 and a braking force is applied, but it is separated from both reel stand means 82.84 as will be described later while the tape is running.

The configuration of the tape running means has been explained above, and next, the configuration of the operating means will be explained mainly with reference to FIG. 2.

The operation means includes a power motor 138, a cam 150 and a cam follower 162 that reciprocate by the power of the power motor 138 via a deceleration means 148, and a plurality of differential mechanisms that selectively reciprocate according to the movement of the cam follower 152. , and a plurality of selection means for making this selection. As shown in FIG. 3, this operating means is disposed on the chassis 2 and a sub-chassis 164 fixed to the chassis 2, and is configured to operate the tape running means in each mode, that is, forward, reverse, fast forward, 2 rewind, It functions to switch between the key, levy-2 pause (pause) and stop modes.

The cam 150 is generally called a triangular cam, and is integrally formed with the final gear 156 that constitutes the speed reduction means 148.

This cam 150id fits this and ranks 18 at the tip.
The cam follower 152 is movable integrally with a cam follower 152 formed with a cam follower 152 having a diameter of 0.0,182, and is movable by electrical control means (not shown) between the first position shown in FIG. 2 and the second position shown in FIG. 7 (representing the forward mode). It is possible to selectively reciprocate between positions.

The bent portion 158 formed in the cam follower 152 displaces the idler lever 126 clockwise in the stop mode (the tab cam follower 152 is in the first position), rendering the idler 134 inactive as described above.

In addition, the brake displacement shaft 1 installed in the cam follower 162
Similarly, in the stop mode, the brake 60 is in a position apart from the bent portion 162 formed on the brake 142, and the brake 142 is brought into a braking state by the play spring 146.

The cam follower is disposed between the chassis 2 and the sub-chassis 164 (hereinafter, in describing the configuration of this device, the chassis 2 and the sub-chassis 154 will not be distinguished and will be referred to as chassis 2). Same direction as 162 (arrow 40
4. Movable members A, B, C, D that can slide freely in 406 directions)
166.168, 170, 172 have racks A, B, C, DI72, 174, 176.1, respectively, as shown in the diagram.
78 is formed. Between the racks A, B 172, 174 and the racks 180, 182 of the cam follower, and between the rack C 176 and the rack p 178, there are support shafts 20 on the guide plates A, B, C 184, 186° 188, respectively.
Binions A, B, 0208 rotatably supported by 2.204.206.

210 and 212 are engaged.

In addition, guide plates A, B, Cl84, 186, 188 are as follows:
Cam follower 152 and each movable member 164.166g168
, 170, and has locking pieces 214, 216, 218 that protrude downward at the ends thereof.

13, - Between the movable member A 164 and the movable member B 166, there is a T-shaped drive shaft 222 that fits into the elongated hole 220 formed in the head substrate 40.
228.

As mentioned above, since the head substrate 40 is urged in the direction of the arrow 406 by the return spring (not shown), the movable member A
, B164 and 166 are locking bins 230 and 232, respectively.
Positioning is performed by making contact with the Similarly, movable member D
170 is biased in the direction of arrow 406 by a screw (not shown) so as to come into contact with locking pin 238.

The movable members B, CI 66, 168 are connected by a lever 236 (shown only in FIG. 12) pivoted on a support shaft 234 on the chassis 2, and move in opposite directions.

P, F7 gear A, B, C, D240.242,24
4.246 has almost the same configuration, so plunger A2
40 will be explained as an example.

The plunger A240 has a support shaft 26 installed in the core 248.
6, a movable piece 266 rotatably supported by a shaft, and a torsion spring 2 that urges the movable piece 226 counterclockwise.
74 and a coil bobbin 282 fixed to the core 248.

The movable piece 226 is normally restricted from rotating counterclockwise by a locking piece 322 formed on the coil bobbin 282, but when the coil bobbin 282 is energized, an attractive force is applied and the movable piece 226 is attracted to the core 248. This state is called the operating state].

Incidentally, the shape of the movable piece 272 of the plunger D246 is slightly different from that of the other plungers A, B, C240, 242, and 244, and its function is also different.

That is, as will be described later, the movable member A164 moves in the direction of the arrow 40.
When the plunger D246 is actuated after moving a certain distance in four directions, the tip 290 of the movable piece 272 moves to the action member A.
It engages with the retaining part 330 formed in 164. This restricts the movable member A164 from moving in the direction of arrow 406.

Next, the cam follower 152, each movable member 164.1e
6, 168, 170 and pinions 20815, 210, 212, and the operation of each granger 240, 242, 244, 246 will be explained.

When the plungers A, B240, 242 are in a non-operating state (non-energized state), the guide plates A, B
Movement in the direction of arrow 406 is restricted by movable pieces 184 and 186, respectively.

When the cam follower 152 is moved from the first position to the second position in this state, the binions A, B2O3, 210
Power is transmitted to the movable members A, B 164, 166 via the movable members A, B164, 166, and each moves in the direction of arrow 404 (see Fig. 7).
.

Conversely, when in the operating state (energized state), the pinions A, B 208, 210 are movable pieces 266°268
approximately % of the movement of the cam follower 152.
is displaced in the direction of arrow 406 (see FIG. 8). This is because the movable pieces A and B 266 and 268 are biased in the direction of the arrow 406 by the spring force as described above.

In addition, movable member C, DI68, 170 and plunger C2
The operation of 44 can be understood using the same concept.

As can be seen from the above explanation, the customer plunger 240.2
42, 244, 246 respectively into the actuated or inoperative state, each movable member 16'4, 16
6. 168, 170 can be selectively displaced in the direction of arrow 404.

Next, as shown in FIGS. 2 and 5, the switching lever 292, which is configured to be slidable in the longitudinal direction, has a cam surface A,
Notch A with B29A, 296, B29B, 300
is formed. The first and second latch levers 108, 110 have pins 302, 30 set thereon.
4 are configured to be able to rotate within the range restricted by notches A, B298, and 300, respectively.

An L-shaped lever 308 rotatably supported on a support shaft 306
(shown only in FIGS. 2 and 5) is the movable member D
170 and the switching lever 290, and the elongated hole 31
0 and 312 respectively have a switching lever 290 and a movable member D.
Support shafts 314 and 316 of the same type are fitted onto 170.

In the stop mode, the switching lever 290 is biased to the right, as shown in FIGS. 2 and 6 (indicated by solid lines). In this state, the second latch lever 110 is not restricted by this switching lever 290 and remains in the operating state, but the first latch lever 108 is not regulated by the switching lever 290.
The pin 302 is in contact with 94 and is in an inactive state. However, the second latch lever 11o is a movable member B.
The switching lever 2 is rotated clockwise via a pin 320 by an arm 318 formed on the switching lever 2.
90, it is in an inoperative state like the first latch lever 108.

Next, the operating principle of this magnetic tape device will be explained. When switching from the above-mentioned stop mode to the forward mode shown in FIGS. 6 and 7, only the plunger C244 is activated (energized), and then the power motor 138 is driven, and the cam 160 and the cam follower are activated. 152 from the first position to the second position.

18/- As a result, as described above, the movable members A and B 164° 166 and the T-shaped lever 224 move in the direction of the arrow 404, and move toward the head substrate 4o and the pinch rollers 24, 26 interlocked therewith with the cassette 4. Move forward a certain distance. The other end 62, 6 of the actuator 42, 44
When the head substrate 4o is advanced until the capstan 4 is separated from the stopper 66, 68, the force of the compression spring 58, 60 acts on the pinch roller 24, 26, and the capstan 1
6. Pressed to 18.

Note that the capstan motors 20 and 22 are always rotated in the same direction after the power switch (not shown) of the device is activated, even when the device is in a stop mode. This is a problem especially when the inertia of the capstan motor 20 is large.
This is to prevent a delay in the startup of 22.

On the other hand, since the plunger C244 is in the operating state, the movement of the movable member B166 and the movable member C168 does not affect the movable member D170 and the switching lever 290 interlocked therewith.

19.

However, as the movable member B166 moves, the second latch lever 110 is moved by the arm 318. 11 is released and brought into operation by the force of the screws 118 and 118. As a result, the second reel stand means 84, which acts as the supply reel stand means in the forward mode, generates a slip load during rotation as described above.
Running magnetic tape.

It is possible to give appropriate pack tension to 6.

Further, as the cam follower 162 moves, the idler 134 becomes activated, the brake 142 becomes non-braking, and the reel motor 136 rotates counterclockwise.
The driving force is transmitted to the first reel stand means 82 via the eye 134.

Note that, not only in the case of forward mode, but generally after the mode switching operation is completed, each plunger 240,
242.244.246 is cut off.

Next, the operation when switching from stop mode to renovating mode will be explained.

The difference between the reverse mode and the forward mode is that the plunger C244 is inactive (de-energized) and the reel motor 136 is driven clockwise.

That is, by putting the plunger C244 into a non-operating state, the movable member DI TO is displaced in the direction of the arrow 404 as the movable member C168 interlocks with the movable member B16θ, and the switching lever 292 is moved as shown in FIG. is displaced to the position shown by the dashed line. As a result, contrary to the case of the forward mode described above, the first latch lever 108 is activated, the second latch lever 110Fi is inactivated, and the first IJ serving as a supply reel stand means is activated.
- It becomes possible to generate slip torque in the wheel stand means 82. Other points are exactly the same as in the forward mode.

The switching operation from the stop mode to the forward or renovating mode has been explained above, but conversely, when switching from the forward or reverse mode to the stop mode, the reel motor 136 is stopped and the cam follower 162 is turned on. This can be done only by returning to position 1. Furthermore, switching from the forward and word modes to the reverse mode, and conversely from the reverse mode to the forward mode, is performed via the -H stop mode, that is, by rotating the cam once.

Note that, not only in the forward or reverse mode, but in general, the energization of the power motor 138 is delayed by a certain period of time from the energization of the plungers 240, 242, 244, and 246. This is each plunger 2
This is to ensure that operation switching can be performed reliably even if there is an electrical or mechanical delay in the operation of 40, 242, 244, and 246. Of course, plungers A, B, C,
When you do not operate any of D240.242.244.246, for example when switching from forward mode to 7-way mode, there is no need to consider the above points (However, when switching from reverse mode to forward mode) (Required if switching).

22,.

Next, switching to the fast forward and rewind modes shown in FIG. 8 will be explained.

The only difference between the fast forward mode and the rewind mode is that the rotation direction of the reel motor 136 is reversed, so the fast forward mode will be explained here as an example. In this case, the plungers A and B 240 and 242 are activated to move the cam follower 162 from the first position to the second position in the same way as in the forward and reverse modes. As a result, the idler 134 is activated and the brake 142 is activated.
becomes a non-braking state. On the other hand, each movable member 164, 16
6, 168, and 170 remain in the stop mode regardless of the movement of the cam follower 152, so that both reel stand means 82, 84 wind the magnetic tape 6 at high speed without generating a slip load. I can do it. In other words, it is possible to minimize the load on the reel motor 136.

Next, the cases of queue and review mode will be explained. Here, the cue and review mode refers to a mode in which a no-signal portion 23 between songs on a magnetic tape 6 on which a plurality of songs have been recorded can be detected to find the beginning of a song. Supports fast forward and rewind modes.

Note that the recording/reproducing head 8 is used to detect the above-mentioned no signal.

The operation of the operating means differs from that in the fast-forward and rewind modes only in that the plunger A240 is in an activated state (energized state) and switching is performed. That is, cam follower 16
o, the movable member A164 is displaced in the direction of arrow 404 as shown in FIG.
is brought to a tilted state. This allows the drive shaft 222
The head substrate 40 connected by the movement amount L is slightly smaller than the movement amount in the forward and reverse modes.
' moves forward toward cassette 4. FIG. 9 is a diagram showing the tape running means at this time, in which the recording/reproducing head 6 is in a retracted position in the forward and reverse modes within the range where it contacts the magnetic tape 8, and the pinch roller 24 is in a retracted position.
．． 26 advances to a point t4 where it is slightly separated from both capstans 16, 1B, and in this state, the first or second
The tape is wound up by reel stand means 82 and 84. Note that the reel motor 136 is rotated counterclockwise in the cue mode and clockwise in the revue mode to drive the first reel stand means 82 and the second reel stand means 84, respectively. Needless to say.

Next, the temporary stop mode (pause mode) will be explained. Switching from the stop mode to the temporary stop mode is performed by activating the plungers B, D242, and 246 (energized state) and causing the cam 150 to rotate once, that is, the cam follower 152 to reciprocate once. Note that in this case, the reel motor remains in a stopped state.

As a result, when the cam 162 first makes a half turn, the head substrate 4
0 and pinch rollers 24,26 advance to the same positions as in the key and levy modes described above. Next, even if the cam 152 is rotated half a turn and the cam follower rack 162 is moved to the first position, the movable piece 272 of the plunger D246 moves in the direction of the arrow 406 of the movable member A164 as shown in FIG. Head substrate 40 and pinch rollers 24, 26 are prevented from returning.
is held in the Kamimachi position.

Next, when switching from this temporary stop mode to, for example, reverse mode, it is sufficient to simply rotate reel motor 136 and displace cam 150 and cam follower 162 to the second position. In this case, compared to the case of switching from the stop mode, the amount of movement of the head substrate 40 is smaller, and the movable member A164 does not move, so that the load on the mechanism at the time of switching can be reduced. As a result, it becomes possible to rotate the Hower motor 138 at a higher speed, and the operating time at the time of mode switching can be shortened. Note that the same thing can be said in the case of forward mode.

In the above embodiment, felt was used as the slip mechanism 104 between the first rotating body 9o and the second rotating body 96, but this is due to relative movement with a multipolar magnetized permanent magnet. Hysteresis 28...

The same thing can be done even if it is constructed with a metal member that causes a loss.

As is clear from the above description, the reel stand device for a magnetic tape device of the present invention includes a first rotating body having a claw that engages with a reel hub, a second rotating body, and a structure disposed between these two rotating bodies. a first and a second slip mechanism provided with a slip mechanism;
reel stand means, and control means for regulating the rotation of the second rotating body, and in the case of forward or reverse mode, only the supply reel stand means of both reel stand means,
The above-mentioned control means is switched so that the above-mentioned slip mechanism is operated, and in other modes, neither of the two base means and the slip mechanism is operated. With this configuration, it is possible to apply an appropriate amount of longitudinal tension to the magnetic tape only during the recording/reproducing mode, and as a result, extremely stable tape running can be realized.

Furthermore, it is also possible to use a non-contact slip mechanism that utilizes hysteresis loss as the slip mechanism27, which makes it possible to realize tape running with higher performance and reliability. The effect is great.

[Brief explanation of the drawing]

Each drawing shows an embodiment of the present invention, and FIGS. 1 and 2 are plan views showing the states of the tape running means and operating means in the stop mode, and FIG. 3 is a side view showing the main parts of the apparatus in the same mode. 4 is a side view showing the i-structure of the reel stand means, FIG. 5 is a plan view of the main part showing the switching operation of the slip and pull mechanism of the reel stand means, and FIGS. 6 and 7 are in the forward mode. FIG. 8 is a plan view showing the state of the operating means in fast forward and rewind modes; FIGS. 9 and 10 show the tape running means in cue and review modes. FIG. 11 is a plan view of the main part showing the state of the operating means during a temporary stop; FIG. 12 is a plan view of the main part showing the relationship between rack B and rack C. . 2φ...-e chassis 411411...cassette, 60...magnetic tape, 8...recording/reproducing head, 113.18Q...capstan, 24.
26...Pinch roller, 32.36.0 fist/tatami pinch roller arm, 40...Head board, 8
2...First reel stand means, 84...-Second reel stand means, 90, 92...First rotating body,
98.98...~ Second rotating body, 100,102.
...Concave and concave teeth, 1o4゜1061111all
l11 Slip mechanism, 108--First latch lever, 11o...Second latch lever, 1
20...Idler means, 134...Medium idler, 136...-Reel motor, 138...Idle motor, 142...II-Brake, 150... e--Cam, 152--1 cam follower, 164--e Movable member A, 166--
...Movable member B, 1css...Movable member C, 1
70...Movable member, 172, 174, 17
6, 180, 182...Rack, 208...Binion A, 210...1 Pinion B
212・Bone・lII・Pinion C, 224-@...eT
Shaped lever, 240...Plunger A, 242
-...Plunger B, 244...-Plunge, C
, 246...9...Plunger D, 290...■...Switching lever.

Claims (1)

[Claims] (1) A reel shaft, a first rotating body rotatably supported on the reel shaft, which has a claw for engaging the reel hub on which the magnetic tape is inserted; The second rotary body is rotatably supported on a shaft, and a slip means is disposed between the first rotary body and the second rotary body and generates a slip load by relative movement between the two. The first
and a second reel stand means for regulating the rotation of the second rotating body when the first rotating body is rotated with a slip load, and regulating the rotation of the second rotating body when the first rotating body is rotated without having a slip load. control means for releasing the regulation of the second rotary body, and the reel on the supply side of the first and second reel stand means in the forward and reverse recording/reproducing modes of the magnetic tape. Only the stand means is configured such that the first rotating body rotates with a slip load, and the first rotating body of both the first and second reel stand means is configured to rotate with a slip load when in a mode other than the above statement/7- playback mode. A reel stand device for a magnetic tape device, characterized in that the reel stand device is configured to be rotated without wasting time. [2] A plurality of concave and convex teeth are formed on the outer periphery of the second rotating body, and the control means has a pawl that can be freely engaged and disengaged from the concave and convex teeth. Reel stand device for magnetic tape device.