JPH0334625B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a reel drive device for driving a supply reel and a take-up reel in a magnetic recording/reproducing device in various modes.

[Technical background of the invention and its problems]

magnetic recording and reproducing devices, such as certain cassette-type devices;
The tape running system of a VTR is constructed as shown in Figure 1.

In the figure, 1 is the base of the VTR, 2 is the tape cassette, 3 is the supply reel, 4 is the take-up reel, 5 is the magnetic tape wound on each reel 3, 4, 6, 7
indicates a tape guide pin disposed on the tape cassette 2. The tape 5 is stretched between guide pins 6 and 7 except when it is loaded onto the tape path. A drum 8 has a pair of rotating magnetic heads (not shown) on its outer periphery, and guides the magnetic tape 5 helically to record and reproduce video signals. Reference numeral 9 denotes a tape guide post disposed on the loading ring 10, which loads the magnetic tape 5 from inside the cassette 2 to a predetermined path and guides the tape running. A capstan 11 is rotated by a motor (not shown), and a pinch roller 12 is pressed against the magnetic tape 5 to transport the magnetic tape 5 at a constant speed.
In addition, in order to prevent the magnetic tape 5 from sagging due to the free rotation of the supply and take-up reels 3 and 4 during VTR operation, that is, except when transferring the tape, a brake (not shown) is installed to prevent the rotation of these reels 3 and 4. ) is provided.

In such a VTR, the following various operating states (referred to as reel modes) are required for the supply and take-up reels 3 and 4.

a When stopped...Both the supply and take-up reels 3 and 4 are braked and do not rotate.

b During loading...one or both of the supply and take-up reels 3 and 4 are rotatable.

c During recording and reproduction...The supply reel 3 is rotatable, and the take-up reel 4 rotates at low speed.

d During fast forwarding...The supply reel 3 is rotatable, and the take-up reel 4 rotates at high speed.

e When unwinding...The supply reel 3 rotates at high speed, and the take-up reel 4 rotates freely.

f During unloading...one or both of the supply and take-up reels 3 and 4 rotate.

As an example of a reel drive device for switching and driving the supply and take-up reels 3 and 4 in various reel modes, the one shown in FIG. 2 is conventionally known. In the figure, reference numeral 13 denotes a supply reel stand, which engages with the supply reel 3 and transmits rotation to the supply reel 3. The supply reel stand 13 includes a gear section 14,
An idler and brake abutment 15 is provided. The idler and brake abutment part 15 is fixed to the reel engagement part of the supply reel stand 13, and the gear part 14 is pressed against the idler and brake abutment part 15 through a felt (not shown) to form a friction clutch. By rotating the gear section 14, the magnetic tape 5 is wound up with a constant torque. 16 is a take-up reel stand, and take-up reel 4
The structure is the same as that of the supply reel stand 13, and the rotation is transmitted to the take-up reel 4. 17
is a motor, and 18 is a roller fixed to the motor shaft. An idler 19 is rotatably attached to the shaft 20 and is pressed against the motor shaft. The idler shaft 20 is rotatable about the motor shaft. 21 is a small gear fixed to the idler 19, 22 is a geared idler, and the shaft 23
It is rotatably mounted. The idler shaft 23 is rotatable about the idler shaft 20. A control plate 24 is arranged below the idlers 19, 22, and this control plate 24 has a narrow hole 25 and a wide hole 26, and further has a cutout 27 on the outer edge for moving the brake arm 28. . A brake tire 29 is attached to the brake arm 28, and when this brake tire 29 comes into contact with the idler and brake contact portion 15 of the supply and take-up reel stands 13, 16, the reels 3, 4 are braked. It's becoming like that.

Now, when the motor shaft 18 is rotated in the direction of arrow A, a rotating force acts on the idler 19 in the direction of arrow B, and similarly, a rotating force acts on the geared idler 22 in the direction of arrow c. . At this time, when the control plate 24 is in the position shown in the figure, the idler shafts 20 and 23 have entered the narrow hole 25 of the control plate 24.
Both idlers 19 and 22 cannot rotate. Therefore supply and take-up reel stand 1
The idlers 19 and 22 do not come into contact with either of the reels 3 and 16, and therefore the reels 3 and 4 do not rotate.
When the control plate 24 is moved in the direction of arrow E, the wide hole 26 moves to the position of the idler shaft 20, and the idler shaft 20 becomes rotatable. At this time, when the motor shaft rotates in the direction of arrow A, the idler 19 rotates in the direction of arrow B.
The take-up reel stand 16 is rotated in the direction shown in FIG. When the motor shaft is reversed, the idler 19 comes into contact with the idler contact portion 15 of the supply reel stand 13,
Rotate this. Similarly, when the control plate 24 is moved in the direction of arrow D, the geared idler 22 becomes rotatable, selectively rotating the supply and take-up reel stands 13 and 16 at a speed reduced by gears. The brake tires 29 come into contact with the brake abutting portions 15 of the supply and take-up reel stands 13 and 16 only when the control plate 24 is in the position shown, and when the control plate 24 is moved in the directions of arrows D and E, the brake tires Contact part 15
It is designed so that it does not come into contact with the

Therefore, when the reel driving device shown in FIG. 2 is used, when the control plate 24 is in the position shown, the reels 3 and 4 are in a stopped state, and when the control plate 24 is moved in the direction of arrow E, the reels 3 and 4 are in a stopped state, and when the control plate 24 is moved in the direction of arrow E, the reels are in a stopped state. unloading,
When the control board 24 is moved in the direction of arrow D in the fast-forwarding or rewinding state, the state is in the recording/reproducing state. Note that a cam mechanism as shown in FIG. 3 is used to move the control plate 24. That is, when the cam 30 is rotated by a motor (not shown), the cam follower 31 is moved, and the control plate 24 is moved by the cam follower 31.

As described above, the conventional reel drive device shown in FIG.
Since the two idlers 19 and 22 are arranged in tandem, they occupy a large space in this direction. This had become a major obstacle.

[Purpose of the invention]

An object of the present invention is to provide a reel drive device that occupies a small space and can contribute to downsizing of magnetic recording and reproducing devices.

[Summary of the invention]

This invention connects the brake contact portion and the idler contact portion of the supply and take-up reel stands via a friction member, and simultaneously contacts the brake contact portion and the brake contact portion of each reel stand. The main feature is that rollers are provided to rotate the reels at high speed by directly transmitting the rotation of the idler to each reel stand without going through a friction member.

〔Effect of the invention〕

According to this invention, only one set of idlers is required to be interposed between the rotational drive source and the reel stand.
The space occupied by the reel drive device, especially in the direction perpendicular to the line passing through the rotation centers of the supply and take-up reels, is reduced, making it possible to further downsize magnetic recording and reproducing devices such as cassette-type VTRs. can be achieved.

[Embodiments of the invention]

FIG. 4 is a perspective view showing essential parts of a reel drive device according to an embodiment of the present invention. Reference numerals 32 and 33 indicate supply and take-up reel stands, which engage with the supply and take-up reels at their upper portions and transmit rotation to these reels. The reel stands 32 and 33 have an idler contact portion 3.
4. Brake contact portions 35 are provided respectively. The reel engaging portions of the reel stands 32 and 33 and the brake abutting portion 35 are fixed, and the idler abutting portion 34 is pressed against the brake abutting portion 35 via a friction member such as a felt 36 to form a friction clutch. However, by rotating the idler contact portion 34, the magnetic tape is wound up with a constant torque.

37 is a motor as a rotational drive source, and 38 is a roller fixed to a motor shaft (drive shaft). 39
An idler holder is rotatably attached to the roller 38 or the motor rotating shaft, and an idler shaft 40 is installed near one end of the idler holder. An idler 41 is rotatably attached to the idler shaft 40, and the idler 41 comes into contact with the roller 38.

A control plate 42 is disposed above the idler 41, and this control plate 42 has a narrow hole 43 and a wide hole 44 formed therein, and further has holes on its outer edge for moving the brake arm 45 and roller arm 46. A notch is formed. The brake arm 45 is rotatably provided around a shaft 47 as a fulcrum.
At one end is a brake tire (brake member) 4
8 is installed, and a brake follower 50 that is pressed against the outer edge of the control plate 42 by a spring 49 is installed at the other end. The brake tire 48 is in contact with the brake contact portion 35 of the supply and take-up reel stands 32, 33 in the illustrated state, thereby applying a brake to the reel.

On the other hand, the roller arm 46 is rotatably provided around a shaft 51, and a roller 52 is rotatably installed at one end of the roller arm 46, and a spring 53 is installed at the other end.
A roller follower 54 is installed which is pressed against the outer edge of the control plate 42 by a roller. The roller 52 is connected to the supply and take-up reel stands 32, 33 in the illustrated state.
The idler contact portion 34 and the brake contact portion 35 are simultaneously contacted. In this state, the rotation from the motor 37 is transmitted in the order of motor pulley 38 -> idler 41 -> idler contact part 34 -> roller 52 -> brake contact part 35 due to the idler 41 contacting the idler contact part 34, which will be described later. , the reel stand is directly driven without using the felt 36 interposed between the idler contact portion 34 and the brake contact portion 35. During fast forwarding and rewinding of the tape, if a slip mechanism such as a friction clutch using the felt 36 is used, high speed winding becomes impossible, and durability deteriorates due to an increase in the PV (pressure x speed) value of the clutch. The provision of roller 52 solves this problem.

Now, when the motor shaft is rotated in the direction of arrow F, a force acting on the idler 41 causes it to rotate in the direction of arrow G. At this time, when the control plate 42 is in the position shown, the idler shaft 40 cannot rotate because it is inserted into the narrow hole 43 of the control plate 42, so that neither the supply nor the take-up reel rotates.

When the control plate 42 is moved in the direction of arrow H, the wide hole 44 moves to the position of the idler shaft 40, and the idler shaft 40 becomes rotatable, and the brake follower 50 and roller follower 54 move to the convex portion of the outer edge of the control plate 42. Since the brake tire 48 and the roller 52 are located at the brake contact portion 35 and the idler contact portion 34, the brake tire 48 and the roller 52 are separated from the brake contact portion 35 and the idler contact portion 34. At this time, when the motor shaft is rotated in the direction of arrow F, the idler 41 rotates in the direction of arrow G and comes into contact with the idler contact portion 34 of the take-up reel stand 33, and the take-up reel is moved through the felt 36. Rotate the table 33. Similarly, when the motor shaft is rotated in the opposite direction, the idler 41 comes into contact with the idler contact portion 34 of the supply reel stand 32, and the felt 3
6 to rotate the supply reel stand 32.

When the control plate 42 is moved in the direction of the arrow J, the idler shaft 40 becomes rotatable, and the brake follower 50 is positioned on the convex portion of the outer edge of the control plate 42, so that the brake tire 48 is moved to the brake contact portion 35. Since the roller follower 54 is located in the concave portion of the outer edge of the control plate 42, the roller 52 is moved away from the idler contact portion 34.
and the brake contact portion 35 . At this time,
When the motor shaft is rotated, the supply and take-up reel stands 32 and 33 are selectively rotated directly by the action of the roller 52 without using the felt. Note that the brake tire 48 contacts the brake contact portion 35 only when the control plate 42 is in the illustrated position.

That is, when the control plate 42 is in the illustrated position, it is in the stop mode, and the brakes are applied to the reel stands 32 and 33 to prevent the tape from moving due to disturbance. When the control plate 42 is moved in the direction of arrow J, it is in the unloading, fast forwarding, and rewinding modes, and by rotating the mode 37 at high speed, one of the reel stands 32 and 33 is directly rotated without using the clutch.
Tape is wound onto a supply or take-up reel at high speed. When the control plate 42 is moved in the direction of the arrow H, it is in the loading and recording/reproducing mode. In the loading mode, the motor 37 is stopped, and in the recording/reproducing mode, the motor 37 is rotated at a low speed to perform winding via the clutch. Reel stand 33
is rotated and winds up the magnetic tape with a constant torque.
To move the control plate 42, a cam mechanism as shown in FIG. 3 may be used.

FIG. 5 shows another embodiment of this invention,
Roller 38 and idler 4 in the embodiment shown in FIG.
1. This embodiment is completely the same as the embodiment shown in FIG. 4, except that gears are formed on the idler contact portion 34 and the idler contact portion of the roller 52, respectively. That is, the rotation of the motor gear 55 fixed to the motor 37 is transmitted to the geared idler 56, and the geared idler 56 rotates under the control of the control plate 42 and comes into contact with the geared idler contact portion 57 of the reel stand. The reel stand is rotated. Further, when the roller 52 comes into contact with the reel stand under the control of the control plate 42, the roller portion 5
8 is the gear part 5 attached to the brake contact part 35 of the reel stand.
By abutting the geared idler abutting portions 57, the reel stand is rotated without using the clutch.

In this embodiment, the geared idler contact portion 57 and the brake contact portion 35 of the reel stands 32 and 33 are
Even if there are some machining or assembly errors in the outer diameter, coaxiality, roundness, etc., rotation can be accurately transmitted through engagement of the gears.

As described above, according to the present invention, only one set of idlers, which would otherwise take up a large space, is required, so the space occupied by the reel drive device is greatly reduced, contributing to the miniaturization of cassette-type VTRs and other magnetic recording and reproducing devices. can do.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an overview of the tape running system of a conventional cassette-type VTR, Fig. 2 is a perspective view of a conventional reel drive device, Fig. 3 is a plan view of its operation switching cam mechanism, and Fig. 4 5 is a perspective view showing one embodiment of this invention, and FIG. 5 is a perspective view showing another embodiment of this invention. 32... Supply reel stand, 33... Take-up reel stand, 34... Idler contact part, 35... Brake contact part, 36... Felt (friction member), 37...
...Motor (rotation drive source), 38...Motor pulley,
40...Idler shaft, 41...Idler, 42...
... Control board, 48 ... Brake tire (brake member), 52 ... Roller, 55 ... Motor gear, 5
6...Geared idler, 57...Geared idler contact portion, 59...Roller gear portion.

Claims (1)

[Scope of Claims] 1. A device for driving supply and take-up reels on which magnetic tape is wound, including a brake abutting portion that engages with each of the reels and is fixed to these engaging portions; A supply and take-up reel stand having an idler abutting part coupled to the brake abutting part of the rotary drive source via a friction member, and a drive shaft of a rotary drive source, and rotational movement according to the rotational direction of the drive shaft. an idler that selectively abuts the idler contact portion of each reel stand to transmit rotation of the drive shaft to each reel stand; and a brake member provided opposite to the brake contact portion of each reel stand. , a roller that simultaneously contacts the brake abutting portion and the idler abutting portion of each of the reel stands, and transmits the rotation of the idler directly to each reel stand without going through the friction member to rotate each reel stand at high speed; In the first position, the rotation of the idler is restricted and each brake member is brought into contact with the brake contact portion of each reel stand, and in the second position, the rotation of the idler is allowed and the Each brake member is moved away from the brake contact portion of each reel stand, the idler is allowed to rotate at a third position, and each of the rollers is moved away from the brake contact portion and the idler contact portion of each reel stand. A reel drive device comprising: a control plate brought into contact with the control plate. 2. The reel drive device according to claim 1, characterized in that gears are formed at the idler abutting portion and at portions of the idler and roller that abut the idler abutting portion.