JPS62217449A - Reel turntable driving device - Google Patents

Abstract

PURPOSE:To reduce VTR in size, power consumption, and cost by providing two rotating members which transmit power from a driving motor to a reel turntable device on the perpendicular bisector which connects a couple of reel turntables, and rotating only one of them according to respective modes. CONSTITUTION:The capstan motor is able to reverse, an FR arm 79 turns according to the rotating direction of an FR idler gear 86, and consequently the rotating direction of an FR idler gear 82 is different. When strong torque for fast forwarding, rewinding, etc., is necessary, the rotation of the FR idler gear 82 is transmitted directly to a reel turntable 89. When recording or reproduction is performed, the rotation is transmitted to the reel turntable 89 through the torque limiter which includes an idler gear 76, gears 75 and 99, and a clutch plate 101. Further, the idler gear 76 and FR idler gear 84 which constitute the final stage member of the rotation transmission system of them are arranged coaxially 71 on the bisector connecting both reel turntables, so the device is reduced in size and power consumption.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a so-called one-motor drive type magnetic recording and reproducing device in which a reel stand device is driven by a capstan motor, and particularly relates to a magnetic recording and reproducing device using a so-called one-motor drive system. The present invention relates to a driving reel stand driving device.

[Conventional technology]

Helical scan type magnetic recording/reproducing device (hereinafter referred to as VT)
As a reel stand drive device (referred to as R).

Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 58-121168, there has been a method using a DD motor that directly drives the capstan, and a method that uses a DD motor to directly drive the capstan, and a method that uses a constant speed magnetic tape as disclosed in Japanese Patent Application Laid-Open No. 58-88852. Capstan for sending! There is a method that uses a driving motor.

[Problem that the invention seeks to solve]

In the reel stand drive device using the former method, VTR
Considerable consideration has been given to reducing the thickness of the device, but as a result, the rotating system is arranged in a plane, which results in a considerable amount of space on the plane. Further, in consideration of power saving, power is transmitted from the DD motor to the reel stand drive device using a timing belt. However, from the perspective of installation work, the timing belt is not an elastic component, so adjustments are required before installation, and temperature changes can cause the timing belt to expand or contract and fall off, or lateral pressure can cause it to fall off. There are performance problems with VTRs such as increases in wow, flutter, and jitter, and from a cost perspective, timing belts are several times more expensive than rubber belts, which increases the cost of VTRs. There is a problem.

In the reel stand driving device using the latter method, the mechanism is very simple to operate and is suitable for miniaturizing the mechanism. However, similar to the reel stand drive device using the former method, the tension of the belt through which power is transmitted from the capstan motor is set to match the strong torque during fast forwarding and rewinding, and moreover, it is used less frequently. Even during recording and reproduction at the highest speed, lateral pressure due to this tension is applied to the motor, which still poses a problem in terms of power saving.

In particular, these problems must be solved as soon as possible for VTRs that use batteries, such as portable type or camera-integrated type VTRs.

The purpose of the present invention is to solve the problems of the prior art and to
An object of the present invention is to provide a reel stand driving device that can realize downsizing, power saving, and cost reduction of a TR.

[Means for solving problems]

To achieve this objective, the present invention provides a recording method.

A first rotating member that transmits power from the drive motor to the reel stand device during playback and search, and fast forwarding and rewinding.

A second rotating member for transmitting motion from the drive motor to the reel stand device when removing slack from the magnetic tape; The second rotating member is assembled on the perpendicular bisector of the line connecting the pair of reel stands and between the reels.

[For production]

These first. In addition to reducing the space occupied by the second rotating member, the first rotating member due to the link system. The second rotating member can be easily controlled, and recording, playback, search, fast forwarding 9
The 1st. Reduce power consumption by rotating only one of the second rotating members [Example]
The mechanical system of R will be schematically explained using FIGS. 14 to 16.

FIG. 14 is a plan view showing a mechanical system provided on the front side of the substrate.

In the figure, on the board 1, there is a reel stand device 2.3 on the top and bottom of the drawing, a rotating cylinder 4 slightly above the center, a capstan motor 5 on the upper left corner, and a loading motor 6 on the left. are provided for each. Rotating cylinder 4
A guide groove 7.8 is provided around the guide groove 7.
A guide groove 9 further branches out from the middle. One end of the guide grooves 7, 8 is close to the reel stand devices 2, 3, and the other end is provided with a stop member 10.11 having a 7-shaped groove 10a, lla@, respectively. 9 extends to near the upper left corner in the drawing, and its end (7-shaped groove 12a
A stop member having ffi is provided.

Position regulation bin 14. The tape pull-out member 13 carrying the guide row 215 and the guide bin 16 is movably attached along the guide groove 7, and the position regulating bin 18. A tape pull-out member 17 carrying a guide roller 19 and a guide bin 20 is movably attached along the guide groove 8, and is further moved along the guide groove 7 from the end on the reel stand device 2.3 side, and then A pull-out roller 21 is provided so as to be movable along the guide groove 9. These tape pull-out members 13, 17 and pull-out rollers 21 are connected to the magnetic tape (
(not shown) are located on the reel stand device 2.3 side of the guide grooves 7, 8, respectively, when they are not wound around the rotating cylinder 4.

On the left side of the drawing, a tension arm 22 with a tension pin 23 installed at its tip is rotatably provided, and the rotation of this tension arm 220 causes the brake shoe 24 to
is controlled to change the braking force applied to the reel stand device 2. Furthermore, the inclined pin 25. A full width erase head (not shown) and an impedance roller 26 are provided.

On the right side of the drawing, a rotating shaft 29 is provided on a shaft 27 implanted in the substrate 1. Also, capstan 30
is rotatably provided integrally with a flywheel (not shown) attached to the back side of the substrate 1, and when this flywheel is rotationally driven by the capstan motor 5, the capstan 30 is rotated. When the pinch roller arm 28 rotates clockwise in the drawing, the pinch roller 29 comes into contact with the capstan 30. Furthermore, guide pin 31. Audio head, control head (
(not shown) is provided.

The rotating cylinder 4 is rotationally driven by a cylinder motor 4 (not shown), and the tape drawing member 13° 17 and the drawing row 221 are driven by the loading motor 6 into the guide grooves 7, 8.
Or move along 9. As described above, the capstan motor 5 serves as a drive source for the capstan 30, but also serves as a drive source for the reel stand device 2.3.

Main brake 32.33t'! , operates when stopped in a loading state or during a recording pause (when recording is temporarily stopped), and stops the reel stand device 2.3.

Although FIG. 14 shows a state in which no tape cassette is installed, next, a state in which a tape cassette is installed and a magnetic tape is loaded will be described with reference to FIG. In Fig. 15, 34 is a tape cassette, 35 is a supply reel, 36 is a take-up reel, 37 is an opening, 38° and 39 are guide bosses), 40 is a magnetic tape, 41 is a full-width erase head, and h42 is a flywheel. wheel, 4
3 is an audio head, and parts corresponding to those in FIG. 14 are given the same reference numerals.

The tape cassette 34 is provided with a supply reel 35 and a take-up reel 36, between which a magnetic tape 40 is stretched via guide posts 38, 39t, as shown by the dashed line. When this tape cassette 34 is inserted from an insertion port (not shown) and mounted at a predetermined position on the board 1, the supply reel 35 is attached to the reel stand device 2 (FIG. 14), and the take-up reel 36 is attached to the reel stand device 3. (Fig. 14), a lid (not shown) provided on the tape cassette 34 is opened, and the opening 37 is exposed and the guide boss) 38
．． A magnetic tape 40 traverses this opening 37 between 39 and 39.

At this time, the tape pull-out member 13° 17 and the pull-out roller 21 are placed inside the magnetic tape 40 in the opening 37.
is located. When the tape cassette 34 is installed at a predetermined position on the board 1 as described above, a switch (not shown) is activated, the loading motor 6 rotates, and the tape drawing member 13 is moved along the guide groove 7. , the tape drawer member 17 is along the guide groove 8, and the drawer 4-
221 moves along the guide groove 7 and midway along the guide groove 9 in the direction shown by the dashed arrow, and the loading operation begins. At this time, the guide roller 15 mounted on the tape pull-out member 13. Guide ruler 19 mounted on guide pin 16 and tape pull-out member 17. The guide bin 20 hooks the magnetic tape 40 and pulls it out from the T-tape cassette 34, and the pull-out roller 21 hooks the magnetic tape 40 halfway.

Then, the position regulating pin 14 mounted on the tape pull-out member 13 fits into the 7-shaped groove 10a of the stop member 10, the tape pull-out member 13 is pressed against the stop member 10, and the position regulating pin 14 mounted on the tape pull-out member 17 is The bottle 18 is the stop member 11
The tape pull-out member 17 is pressed against the stop member 11 by fitting into the figure-7 groove 11a of the stop member 12, and the moving body (not shown) on which the pull-out roller 21 is mounted moves into the figure-7 groove 1 of the stop member 12.
2a, the loading operation is now complete. As a result, from the supply reel 35 to the rotating cylinder 4, the drawing roller 21. The inclined pin 25° guide roller 15 and the guide pin 16 form a traveling path on the side of the magnetic tee 1400 Å, as shown by the solid line, and from the one-turn cylinder 4 to the winding heel 36 is the id pin 20. The guide roller 19 and the guide pin 31 form an ejection path for the magnetic tape 40, as shown by the solid line. At this time, the magnetic tape 40 is spirally wound around the rotating cylinder 4 over a length of 180'' or more, and the tension pin 23, full-width erasing head 41, and impedance roller 26 are in contact with the magnetic tape 40 on the input side running path. A control head (not shown), an audio head 43 and a capstan 30 come into contact with the magnetic tape 40 on the output path.

Next, when the recording/playback button is pressed, the pinch i-ra arm 2
8 (FIG. 14) rotates, and the pinch j-229 pinches the magnetic tape 40 together with the capstan 30. The capstan 30 is rotated by a capstan motor 5 via a 72-wheel 42Y, and the magnetic tape 40 runs from a supply reel 35 to a take-up reel 36, and is rotated by a rotating cylinder 4.
Rotating heads (not shown) scattered on the
Recording or playback is performed.

Tension arm 22 provided with tension pin 23
(Fig. 14) rotates according to the tension of the magnetic tape 40,
As a result, the brake shoe 24 (FIG. 14) is actuated to change the braking force applied to the reel stand device (FIG. 14), and the tension of the magnetic tape 40 is maintained constant. Impedance roller 26 absorbs vibrations of magnetic tape 40.

The full-width erase head 41 operates in the recording mode and erases the entire width of the magnetic tape 40. A control head (not shown) and an audio head 43 record and reproduce a control track or an audio track located at the edge of the magnetic tape 400 in a recording mode or a reproduction mode, respectively.

When unloading, load motor 6
rotates in the opposite direction, the tape pull-out member 13.degree. 17 and the draw-out row 221 move in the opposite direction, and the supply reel 35 receives the magnetic tape 40 from the barrel.

In addition, in the loading operation, in FIG. 14, the main brake 32 or 33 is connected to the reel stand device 2 or 3.
They are more spaced apart.

FIG. 16 is a plan view of the mechanical system including the reel stand driving device Z according to the present invention, seen from the back side of the substrate 1, in which 44 is a belt, 45.46 is a gear, 47 is a shaft, 48.49 is a belt, and 50 ,51,52゜53 is a pulley, 54 is a bell), 55t'! Mode switching gear, 56 is a rotary switch, 57, 58° 59 is an arm, 59m is a step, 59b
is a pin.

60 is an arm, 60a is a protrusion of the arm 60, and 61 is an arm, and parts corresponding to FIGS. 14 and 15 are given the same reference numeral t.

In FIG. 16, 50 rotations of the capstan motor are transmitted through a belt 44Y to a flywheel 42 on which a capstan 30- (FIG. 15) is mounted. A belt 48 is stretched between the flywheel 42 and the pulley 50,
A belt 49 is stretched between a pulley 51 and a gear 46 that can mesh with a gear 45 provided on the flywheel 42, and as the capstan motor rotates 50 times, the pulley 5
0 rotates, but the pulley 51 enters and rotates when the gear 46 meshes with the gear 45.

The reel stand devices 2 and 3 shown in FIG. 14 are driven by a capstan motor 5 via a pulley 50 or 51 for recording, playback, and fast forwarding.

Pulley 50 and pulley 51 are selected depending on the operating mode such as rewinding. This selection of pulleys 50 and 51 is performed by mode switching gear 55.

That is, the mode switching gear 55 is connected to the pulley 52. of the loading motor 6. Belt 54. It is rotated by the four-way motor 6 via the pulley 53 and a gear mechanism to be described later, and as the mode switching gear 55 rotates, the arms 57 and 58 rotate, and the arms 59 and 60 rotate. By movement of the shaft 47 provided at 60, the gears 45 and 46 of the flywheel 42 are engaged and disengaged, and the operation and non-operation of the driving force transmission system via the pulley 51 is controlled. The above points outline the reel stand driving device of the present invention.

Next, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of a reel stand driving device according to the present invention, and FIG. 2 is a plan view thereof.

In FIG. 1, 42a is a pulley, 62 is a FW bearing, and 6
2a and 62b are radial bearing parts, 62C is a thrust bearing part, 63 is a pulley, and 64 is a felt.

65 is a compression spring, 66 is a plate, 67.68 is a bearing,
69 is a shaft, 70 is an idler gear, 71 is a shaft, 72 is an arm, 72a is an end, 73 is a stopper, 74
is shut, 75.76 is idler gear, 76a, 76
b is the gear part, 77 is the plate 78 is the bearing, 79 is the FR
(Fast forward 7 rewind) Arm, 80 is shaft, 81t!
7 Elt, 82 is FR id 2 gear, 83 is compression spring,
84 is a spring receiver, 85 is a pusher, 86 is an F round idler gear, 87 is a washer, 88 is a shaft, 89 is a reel stand, 90 is a thrust receiver with a screw, 91 is a threaded part, 92 is a P
R gear, 93.94 is external part for brake pressure, 95 is clutch spring, 96 is clutch, 96' is cap, 97
is a spring receiver, 98 is a torque spring, 99 is a winding gear, 1
00 is felt, 101 is a clutch plate. In addition, in FIG. 2, 5a is a motor pulley, 32a is a hook portion, 32b is a protrusion, 33a is a rib portion, 33b is a protrusion, 1
02 is a tension spring, 103. 10441/-? 7)
.

105 is the main brake control arm, 105a is the pin, 10
6 is a shaft. Note that parts corresponding to those in the previous drawings are given the same reference numerals.

In FIGS. 1 and 2, a motor pulley 5a attached to a capstan motor 5 and a flywheel 42
A belt 44 is stretched between the two. Therefore, the rotation of the capstan motor 5 is transmitted to the flywheel 42.

The flywheel 42 has a pulley 42B and a gear 45, and is integrated with the capstan 30 held by the FW bearing 62. The FW bearing 62 is attached to the board 1, and the radial bearing has a portion 62a162b connected to the capstan 3.
0 in the radial direction, and its thrust bearing is part 62.
c is the support t of the capstan 30 in the thrust direction.

A gear 46 that can engage and disengage from a gear 45 of the flywheel 42 is rotatably attached to a shaft 47 mounted on an FR control block FRB, which will be described later. Further, a pulley 63 is rotatably attached to the shaft 47, a felt 64 is provided between the pulley 63 and the gear 46, and the gear 46 is rotated by a compression spring 65.
Elt 64 is pressed against pulley 63. Furthermore, although a detailed explanation will be omitted, when the arm 61 (FIG. 16) applies pressure in the direction of the arrow, the rotation of the gear 46 is caused by the felt 64? ! However, when there is no pressing force, the rotation of the gear 46 is directly transmitted to the pulley 63.

On the other hand, bearings 67 and 68 are visible through the plate 66. The bearing 67 rotatably supports a shaft 69, and a pulley 50 and an idler gear 70 are attached to the shaft 69. A belt 4 is connected between this pulley 50 and the boot 1742a of the flywheel 42.
8 is stretched, and 420 rotations of the flywheel are transmitted to the idler gear 70.

The bearing 68 rotatably supports a shaft 71, into which the pulley 51 is press-fitted. A belt 49 is stretched between this pulley 51 and a pulley 63 provided on the PR control block FRB. Further, a two-stage idler gear 76 is provided on the shaft 71 so as to be freely rotatable in relation thereto, and one gear portion 76a of the idler gear 76 is meshed with an idler gear 70 provided on the shaft 69.

An arm 72 is rotatably attached to the outer periphery of the bearing 68, and a stopper 73 is press-fitted into the bearing 68 to prevent the arm 72 from coming off. Arm 7
End 72 of 2! I is bent into a U-shape, and a shaft 74 is installed thereon, and an idler gear 75 is rotatably attached to this. This idler gear 75 meshes with a gear portion 76b of an idler gear 76 attached to the shaft 71.

From the above, 420 rotations of the flywheel is caused by belt 48. Pulley 50. Gear 70 and idler gear 76Y
The signal is transmitted to the idler gear 75 via the idler gear 75.

FIG. 3 is a plan view showing a portion of the arm 72, 66
a, 66b are bent parts, 72b is a bent part, 72c is an opening, 72d is a bent part, 107, 108 are tension springs, 10
9 is the shaft, 110 is A, 110 a, 1
10b is a bent portion, 111 is a pin, and portions corresponding to those in FIG. 1 are marked with the same symbol Y.

In FIG. 3, an arm 7 rotatable with respect to a bent portion 66a provided on a fixed plate 66 and a shaft 71.
A tension spring 107 is applied between the arm 72 and the bent portion 72b of the arm 72, thereby biasing the arm 72 in the clockwise direction. Further, a shaft 109 is installed on the plate 66, and a tension spring 108 is applied between the bent portion 110b of the arm 110 rotatably attached to the shaft 109 and the bent portion 66b provided on the plate 66. The arm 110 tt is biased counterclockwise by the arm 110 tt, but the bottle 111 provided in the arm 110 engages with one end of the approximately triangular opening 72C provided in the arm 72, and the arm 110Y is pulled through the arm 110Y. The biasing force of the spring 108 is the arm 1
1 (1- Since it is pulled counterclockwise, the arm 72 is prevented from rotating.

Returning to FIG. 1, the shaft 71 is further rotatably provided with a bearing 78 to which a plate 77 is fixed. Plate 77 is fixed to plate 66 with screws 112a and 112b, as shown in FIG. This plate 77 also prevents the idler gear 75 from coming off the shaft 74.

An FR arm 79 is attached to the outer circumference of the bearing 78 so as to be able to rotate once, and an FR hydraulic gear 82 is attached to this FB arm 79.
A felt 81 is provided between the FR idler gear 82 and the FR arm 79.
is provided.

A spring receiver 84 is provided on the shaft 80, and a compression spring 83 is installed between the spring receiver 84 and the F'R idler gear 82.
By press-fitting the bush 85t into the shaft 80 for preventing removal, the FR idler gear 5zvpR arm 79 is pressed by the biasing force of the compression spring 83.

On the other hand, a PR idle gear 86 is connected to the shaft 71 by a D cut so as to rotate together with the shaft 71, and a washer 87 is fitted to the tip of the shaft 71 to prevent the FR idler gear 86 from coming off. This PR idler gear 5sts, PR idler 2 gear 8 provided on the pR arm 79
It meshes with 2.

From the above, from the pulley 63 of the shaft 47 provided with the PR control block FRBK, the belt 49° pulley 51.
Shaft 71. The same rotation is transmitted to the FR idler gear 82 via the FR idler gear 86.

FB arm 79 is shown in Fig. 4 and its side? As shown in FIG. 5, it has a triangular opening 79aY at its end, and a groove 79b is provided at one end of the opening 79a. Normally, as will be described later, a predetermined protrusion engages with this groove 79b, and the FR arm 79 rotates. thwarted.

Next, the reel stand device 2.3 will be explained, but since both have the same configuration, the reel stand device 2 on the supply side will be explained here.

The reel stand device 2 is rotatable around a shaft 88 mounted on the substrate 1. The shaft 88 and the thrust receiver are always in contact with the screw 90 at the upper part of the shaft 88, and the reel stand 89 and the thrust receiver are provided with a threaded portion 91 into which the screw 90 is screwed together, and the thrust receiver is provided with a screw 90.
0Y: The height of the reel stand device 2 can be adjusted by rotating and moving the reel stand 89 up and down.

Furthermore, the reel stand 89 includes an FR gear 92 that can mesh with the FR idler gear 82, and an external part 9 for crimping various brakes.
3.94 is provided.

At the top of the reel stand 89 is a clutch 96 that is biased upward by a clutch spring 95 and is engaged with the supply reel 35 (FIG. 15) of the tape cassette 34 (FIG. 15).
is inserted, and a cap 96' is press-fitted into the upper end of the reel stand 89 to prevent the clutch 96 from being removed.

Below the reel stand 89 are a spring holder 97 and a winding gear 9.
9 is rotatably inserted, and a torque spring 98 is inserted between them.
is provided. A chef latch plate 101 is press-fitted between the shaft 88 and a part of the reel stand 89, and the reel stand 8
It is integrated with a 9χ clutch plate 101, and a felt 100 is provided between this clutch plate 101 and the winding gear 99. This winding spring 99 and the clutch plate 101eX7 Elt 100 are connected by the torque spring 98.
It's sandwiched between χ. The take-up gear 99 meshes with the idler gear 75. Winding gear 99. Felt 100 and clutch plate 101 t'! ) constitutes Lucrimitsuta.

The supply reel stand 2 is rotated via two rotation transmission systems. One is that the rotation is directly transmitted from the FR idler gear 82 to the reel stand 89, and the other is that the rotation is transmitted from the idler gear 75 to the reel stand 89 via a torque limiter consisting of a winding gear 99° felt 100 and a clutch plate 101. When the FR idler gear 82 is engaged with the PR gear 92 of the reel stand 89, the idler gear 75 and the reel stand 89 are connected by a separate mechanism.
The rotation transmission system between them is cut off, and the reel stand 89 is rotationally driven directly from the FR idler gear 82.

Next, the operation of this embodiment in each operation mode will be explained.

[a) Recording, playback and search mode: The flywheel 42 rotates as follows: pulley 42a → belt 48 → pulley 50 → shaft 69 → idler gear 70 → idler gear 76 → idler gear 75 → take-up gear 99 → felt 100 → clutch plate 101 %- to the reel stand 89, and the reel stand 89 rotates while slipping between the winding gear 99 and the felt 100. Reel stand 89
External brake crimping part 93K)'! brake shoe 24
(FIG. 14) come into contact with each other, thereby applying back tension to the magnetic tape 40.

In this case, the idler gear 75 is connected to the reel stand device 2 on the supply side.
The bent portion 110b of the arm 110 is pushed in the direction of the arrow by a member not shown in FIGS. 3 and 4, and the arm 110 is rotated clockwise with respect to the shaft 109. move, arm 110
The lock between the pin 111 and the opening 72C of the arm 72 is released, and as a result, due to the biasing force of the tension spring 107,
This is due to the arm 72 rotating clockwise about the shaft 71. Next, by being pressed in the direction of the arm 110, the arm 110 rotates counterclockwise,
As a result, the arm 72 rotates counterclockwise and the idler gear 75 engages with the take-up gear 99 of the reel stand device 3 on the take-up side. At this time, the idler gear rotates at 750 rpm.
It is transmitted to the reel stand device 3 on the winding side.

(bl Fast forward 9 rewinding, tape slack removal during tape unwinding: At this time, the gear 45 provided on the flywheel 42 and the gear 46 provided on the shaft 47 mesh with each other due to the operation of the FR block FRB, which will be described later. The rotation of the flywheel 420 is transmitted to the reel stand 89 via the gear 45 → gear 46 → pulley 63 → belt 49 → pulley 51 → shaft 71 → FR hydraulic gear 86 → FR idler gear 82 → FR gear 92g.

Here, the capstan motor 5 can rotate in forward and reverse directions,
Although the rotation direction of the PR idler gear 82 differs depending on the rotation direction, the FB idler gear 82, the felt 81, and the PR arm 79 constitute a torque limiter, and this torque limiter causes the PR arm 79 to move in a direction corresponding to the rotation direction of the FR idler gear 86. rotates.

That is, in FIG. 4, the PR idler gear 8 is now
6 rotates clockwise, this applies a force that moves the PR idler gear 82 to the right, thereby causing the PR arm 79 to rotate clockwise about the shaft 71. For this purpose, as is clear from FIG. 2, the PR idler gear 82 meshes with the gear of the reel stand of the reel stand device 3 on the winding side (corresponding to the FR gear 92 of the reel stand 89 in FIG. 1). As a result, the reel stand device 3 rotates clockwise to rapidly advance the tape.

Conversely, when the FR idler gear 86 rotates counterclockwise, the FR arm 79 rotates counterclockwise in FIG. mesh with. This causes the reel stand device 2 to rotate counterclockwise in FIG.

In this way, either one of the reel stand devices 2.3 is selectively driven to rotate depending on the rotational direction of the capstan motor 5.

As described above, the rotation transmission system when rotating the reel stand device 2.3 with a weak torque for recording, playback, etc. and the rotation transmission system when strong torque is required such as fast forwarding and rewinding are separated. Therefore, the tension and breakage of each belt can be set independently, and power consumption can be reduced. Moreover, the final stage member of these rotation transmission systems (idler gear 76
and PR idler gear 86) are placed coaxially on the bisector of the straight line connecting the reel stand device 2.3, so the members (idler gear, pulley, etc.) that make up the respective rotation transmission systems are also placed coaxially. can be provided, and the planar space they occupy can be reduced.

Thereby, power saving and miniaturization of the VTR can be achieved.

Next, control means for each operation mode of this embodiment will be explained.

FIG. 6 is a plan view showing the control means of the above embodiment,
113 to 119 are gears, 120, 121° and 122 are sliders, 123. 124. 125 is an arm, and parts corresponding to those in the previous drawings are designated by the same reference numerals.

In FIG. 6, as explained in FIG. 16, a belt 54 is stretched between the pulleys 52 and 53 of the loading motor 6, and the rotation of the loading motor 6 is transmitted to the pulley 53. Furthermore, this rotation is caused by gears 113~
119 and is transmitted to the mode switching gear 55.

As shown in FIG. 7, the mode switching gear 55 is provided with two cam grooves 55a and 55b, and a pin 57a planted at the tip of the arm 57 is slidably fitted into the cam groove 55alC. Further, a pin 58a planted at the tip of the arm 58 is slidably fitted into the cam groove 55b. The arm 57 is attached to the shaft 126, and the arm 58 is attached to the shaft 7) 127.
They are mounted so that they can rotate. When the mode switching gear 55 rotates, the arms 57 and 58 rotate around the shafts 126 and 127 when the pins 57at and 588 are located at the portions where the cam grooves 55a and 55b change the distance from the center of the mode switching gear 55. move.

Returning to FIG. 6, a slider 120 is provided above the mode switching gear 55, a slider 121 is provided above the slider 121, and a slider 122 is provided above the slider 120.
An arm 123 is provided above a portion of 22. Parts of the sliders 120 and 121 are located between the mode switching gear 55 and the arms 126 and 127.

As shown in FIG. 8, the slider 120 has an L-shape and has seven elongated holes 120a to 120gt. Of these, the elongated hole 120d is provided with a recess 120h on its - side, and the elongated hole 120gK is provided with its - side.
A bent portion 1201 protruding from the surface of the slider 1200 on the side
is provided.

In FIG. 6, elongated holes 120e and 120f.

120cK+! , shafts 121 planted on the substrate 1, respectively.
j, 129, and 130 are slidably fitted, and these allow the slider 120 to slide in the direction of the arrow B-y. Further, a pin 58a that is installed on an arm 58 that fits into a cam groove 55b of the mode switching gear 55 slidably passes through the elongated portion 1201. Therefore, when the mode switching gear 55 rotates and the arm 58 rotates around the shaft 127, the slider 120 moves as indicated by the arrow B.
-Move in the B' direction.

The slider 121 has six elongated holes 1 as shown in FIG.
21a to 121f, of which 121h' is
Further, each of the long parts 1216 is provided with a convex part 1211 on one side thereof. In Fig. 6, the elongated hole 121 c y
Shaft 13 on 121 e t 121 f respectively
0, 128, and 129 are slidably fitted to each other, and the slider 121 is mounted to be slidable in the direction of the arrow B-B/. Pin 57a planted in the fitted arm 57
is slidably passed through the elongated hole 121a, and when the mode switching gear 55 rotates and the arm 57 rotates around the shaft 126, the slider 121 moves in the direction of arrow B-B'.

Slider 122. Details of the arms 123 and 124 are shown in FIG. 10 (5) (cloudy).

In the same figure, the slider 122 has an elongated hole 12.
2a, 122b, 122j, recessed portion 122C.

122d, a stepped portion 122e, and a cam portion 122f, and a long portion 122aK is a shaft 131 that is set on the substrate 1.
(FIG. 6), the shafts 132 (FIG. 6) mounted on the substrate 1 are slidably fitted into the recesses 122cK.

This allows the slider 122 to slide in the direction of the arrow BB/ in FIG. Furthermore, a bent portion 120i (FIG. 8) provided on the slider 120 protrudes from the elongated hole 122j of the slider 122.

The slider 122 is also provided with pins 133 and 134, and an arm 124 is rotatably attached to the pin 133, and the pin 134 is slidably fitted into a long hole 123a provided in the arm 123. For this purpose, arm 1
23 is rotatable relative to the pin 134. The E-ring 135 is K-shaped to prevent the arm 123 from coming off the pin 134. A tension spring 136 is hung between the spring hook 123b of the arm 123 and the spring hook 122g of the slider 122, and the arm 123 is biased clockwise and in the direction of arrow C around the pin 134. . The slider 122 is further provided with bent protrusions 122h and 122i, which prevent the arm 1230 from rotating due to the tension spring 136, and the bent protrusions 122i prevent the arm 123 from coming off. There is. The tip 123C of the arm 123 is the sixth
As shown in the figure, it can come into contact with a serrated gear portion 117a provided on a gear 117. In addition, the arm 123 has
The boss 123 can come into contact with the tip 124a of the arm 124.
d is provided.

The arm 124 is biased clockwise by a tension spring 137 (FIG. 6) hooked between the spring hook 124b and the board 1. protruding slider 120
arm 124 .
A slider 122 is fixed to slider 120. Further, a pin 124d is installed on the arm 124, and this pin 124 d t'! Slider 122 long hole 1
22j to the cam portion 121j of the slider 121 (Fig. 9)
It protrudes so that it can come into contact with.

In FIG. 6, the arm 125 is used to set the fast-forward, one-rewind, and slack-removal modes, and is rotatably attached to a shaft 7) 138 set up on the substrate l, and a pin 125a is attached to one end of the arm 125. Pins 125b are also attached to the other ends, respectively. Pin 125 at! Slider 121
A part of it is bent and is slidably fitted into the elongated part 121b.

The reel stand driving device is controlled by the above mechanism.Next, blocks for this control will be explained with reference to FIGS. 2 and 6.

First, the main brake control block that controls the main brakes 32 and 334 in FIG. 2 will be explained.

The main brakes 32.33 are mounted on the substrate 1 at positions symmetrical to the bisector of the straight line between the centers of the reel stand devices 2.3.103. 104 so as to be rotatable. Further, a tension spring 102 is stretched between the hook portion 32a of the main brake 32 and the hook portion 33a of the main brake 33, so that the main brake 32 is attached counterclockwise so as to come into contact with the reel stand device 2. The main brake 33 is urged clockwise so as to come into contact with the reel stand device 3.

These main brakes 32, 33 are connected to the main brake control arm 1
Controlled by 05. This main brake control arm 1
05 is rotatably attached to a shaft 106 set on the substrate 1, and has a bent portion 105b at one end (FIG. 6).
is provided, and a bottle 105a is planted at the other end. In FIG. 6, this bent portion 105b)'! Elongated hole 120d of slider 120 and elongated hole 12 of slider 121
1d, and the cam portion 122f of the slider 122
It is possible to come into contact with. Bin 105atX Protrusion 32b of main brake 32 and protrusion 33 of main brake 33
It is in contact with b.

Here, the bent portion 105b of the main brake control arm 105
are the parts of the elongated hole 120d of the slider 120 other than the recessed part 120h (Fig. 8), the parts of the elongated hole 121d of the slider 121 other than the recessed part 121g (Fig. 9), and the parts of the recessed part 122d of the slider 122 other than the cam part 122f ( Figure 10 (
At point A)), the main brake control arm 105 is rotated clockwise about the shaft 106, so that the pin 1 of the main brake control arm 105 is rotated clockwise about the shaft 106.
05a is the protrusion 32b of the main brake 32.33.

33bY is pressed. Therefore, the main brake 32.3
3 are both separated from the reel stand device 2 and 3, and their brakes are released.

Conversely, when the bent portion 105b of the main brake control arm 105 is located in the recess 120h of the elongated hole 120d of the slider 120, the recess 121g of the elongated hole 121d of the slider 121, and the cam portion 122f of the slider 122, the pin of the main brake control arm 105 Main brake 32 by 105a.
33 is released, and the tension spring 102 causes the main brakes 32, 33 to abut on the respective reel stand devices 2.3. This applies a brake to the reel stand device 2.3.

Next, a description will be given of the control block FRB, FB for fast forwarding and rewinding 7 reels, and ) control block FRB in FIG.

It consists of two arms 59, 60 rotatably mounted on a shaft 128 mounted on the base plate 1. 1st
To explain in more detail with Figure 1, A59,60IC
T'! hook portions 59 c and 60 b are provided, respectively;
Each end of the coiled spring 139 is hung, and
The protrusion 60a planted at the tip of the arm 60 is connected to the arm 59.
It engages with a stepped portion 59a provided in the. Winding spring 13
9 biases arm 60 clockwise and arm 59 counterclockwise with respect to shaft 128;
Since the protrusion 60a engages with the stepped portion 59a, these rotations are prevented, and thereby the arm 59.60
are integrated.

A bottle 59b is further installed on the arm 59, and this bottle 59b has a long length 1 of the slider 120 in FIG.
20e (Fig. 8) and the elongated hole 121e of the slider 121
(FIG. 9) Penetrates the slider 122 and is located opposite the stepped portion 122e of the slider 122.

Further, a shaft 47 shown in FIGS. 1 and 16 is installed at the other end of the arm 60, and a gear 46 is rotatably attached to the shaft 47. Bin 59b is slider 121
When the arm 59 rotates nine times counterclockwise in FIG. 6 by engaging the convex portion 1211 of the elongated hole 121e and the stepped portion 122e of the slider 122 (FIG. 10 (5)), the arm 59 rotates nine times counterclockwise in FIG.
0 is also rotated counterclockwise about shaft 128 by wound spring 139 (in FIG.
is engaged with the gear 45, and one fast forward and one rewind are performed. At this time, the belt 49 (FIG. 1) is pulled and the arm 60
The protrusion 60a is separated from the stepped portion 59a of the arm 59. The bottle 59a is the protrusion 1 of the elongated hole 121e of the slider 121.
211 (FIG. 9) and the stepped portion 122e (FIG. 10 (5)) of the slider 122 are disengaged, the gear 46 is moved by the tensioned belt 49 in FIGS. 1 and 16. Separated from the gear 45 of the flywheel 42, the arms 59 and 60 rotate clockwise about the shaft 128. As a result, the fast forward one rewind mode is canceled.

Here, the operation of the control means shown in FIG. 6 will be explained.

First, when the tape cassette 34 is in the loaded state (unloading stop state), the control means is in the state shown in FIG.

That is, in the figure, the slider 120 is in the state of moving in the direction of arrow B' (the slider 120 is in the eject state when it moves to the limit);
1 is in a state where it has moved to the limit in the direction of arrow B. At this time, the pin 59bt' installed on the arm 59 of the FB control block FRB! The arm 59 and the arm 60 integrated therewith by the coiled spring 139 (FIG. 11) are in contact with the protrusion 121i provided on the side of the elongated hole 121e of the slider 121, counterclockwise with respect to the shaft 128. It is in a state of rotation in the direction. In this state, the gear 46 provided on the shaft 47 is meshed with the gear 45 of the flywheel 42, as shown in FIG.

Furthermore, the recess 120h of the elongated hole 120d of the slider 120 (
(Fig. 8) and the recess 121 of the elongated hole 121d of the slider 121.
g (FIG. 9), and for this reason, the bent portion 105b of the main brake control arm 105 is located in the elongated hole 120d of the slider 120 at a position opposite to the recessed portion 120h (FIG. 8). , elongated hole 121d of slider 121
Inside, the main brake control arm 105 is in a clockwise rotated state with respect to the shaft 106 because it abuts the bent portion 121h' (FIG. 9).

Therefore, in FIG. 2, the main brake control arm 105
The protrusions 32b and 33b of the main brake 32 and 33 are pushed clockwise against the biasing force of the tension spring 102, and the main brake 33t is rotated clockwise with respect to the shaft 103.
It is in a state where it is rotated counterclockwise. For this reason, there is no brake on the reel stand device 2.3.

Further, the bent portion 120i (FIG. 8) provided on the side of the slider 120 with a length of 120g passes through the slider 122 that holds the slider 121 between them together with the slider 120, and protrudes toward the arm 124 provided on the slider 122. However, the protrusion 12 provided on this arm 124
4C (Fig. 10 (5)). For this reason, the arm 124 attempts to rotate clockwise with respect to the pin 133 set in the slider 122 due to the biasing force of the tension spring 137.
2oi acts as a stopper to prevent this rotation, and in addition, due to the biasing force of the tension spring 137, the arm 124
A force is applied to the arm 12 in the direction of arrow B.
Along with 4, slider 1 equipped with this and arm 123χ
22 is in a state where it has moved to the limit in the direction of arrow B. This limit is the elongated hole 122a of the slider 122 (Fig.
5) The end of the shirt 131 is in contact with the shirt 131.

When the slider 122 is in this position, the arm 1
The tip 123C of the gear 117 is the serrated gear portion 11 of the gear 117.
7a, and the stepped portion 1 of the slider 122
22e (Figure 10 [A)) t! The cam portion 122f of the slider 122 is located away from the pin 59b installed on the arm 59 of the PR control book FRB.
FIG. 10(5)) is also separated from the bent portion 105b of the main brake control arm 105.

Furthermore, the pin 125 at which is planted in the arm 125
It is located at the end of the linear part of the elongated hole 121b of the varnish slider 121, and therefore the opening 79a (the fourth
The pin 125bt'' of the arm 125 is located inside the opening 79a (see FIG. 4).

Therefore, in FIGS. 1 and 4, the FR arm 79 is in a freely rotatable state with respect to the shaft 71.

Furthermore, a pin 141 a is attached to an arm 141 rotatably attached to a shaft 140 installed in the board work.
14 lb is provided, of which pin 141a
is fitted into the elongated hole 121e (FIG. 9) of the slider 121, and since the slider 121 is in the state of moving to the limit in the direction of arrow B, this pin 141a is fitted into the elongated hole 121e (FIG. 9) of the slider 121.
It is in a state where it is fitted into the thin part at the tip of 21e. As a result, the arm 141 is restricted in a clockwise rotational state with respect to the shaft 140. In such a situation.

The pin 141b of this arm 141 can come into contact with the PR arm 79, thereby preventing the FR arm 79 from further rotating clockwise relative to the shaft 71 from the state shown in FIG. For this reason, the FR idler gear 82 can mesh with the reel stand device 2 on the supply side in FIG. 2, but cannot mesh with the reel stand device 3.

In such a state, as shown in FIG.

When the tape cassette 34 containing the magnetic tape 40 indicated by the dashed line is loaded, loading is automatically started.

At this time, the pin 59b planted on the arm 59 of the FR control block FRB is still attached to the elongated hole 121 of the slider 121.
Since it is in contact with the convex portion 121i (FIG. 9) of the first
In the figure and FIG. 2, the gear 4 of the flywheel 42
At this time, the capstan motor 5 is rotating and the PR idler gear 86 in FIG. 4 is rotating clockwise. As a result, the F'R arm 79, which is rotatably provided on the shaft 711C, also tries to rotate clockwise, but the pin 14 of the arm 141
1b (FIG. 6) prohibits this, the FR idler gear 82 does not mesh with the reel stand device 3 in FIG. That is, the FR idler gear 82 is prevented from meshing with the reel stand device 2 by the capstan motor 50 rotations, and is also prevented from meshing with the reel stand device 3 by the pin 141b of the arm 141 (FIG. 6). At this time, the magnetic tape 40 (FIG. 15) is pulled out from the tape cassette 34, but since the FR id 2 gear 82 does not mesh with any of the reel stand devices 2.3, no undue load is applied to the magnetic tape 40. become.

When the loading operation is completed with the magnetic tape 40 as shown by the solid line in FIG. 15, the slider 121 further moves slightly in the direction of arrow B'. In this state, the mode switching gear 55 is in the fast forward or rewind mode.

However, in FIG.
Convex portion 1211 provided in elongated hole 121e of No. 1 (Fig. 9)
It's off. When the pin 59b is in contact with the convex portion 121i, the gear 45 of the flywheel 42 and the gear 46 provided on the shaft 47 are engaged with each other in FIG. 1, as described above. When the belt 49 is connected to the coiled spring 139 (first
It is stretched between the pulleys 51 and 63 by the urging force shown in Figure 1). Therefore, as described above, the pin 59b
If it deviates from 1, the biasing force of the spring 139 will weaken.
The tension in belt 49 (FIG. 1) also causes arm 60 to rotate clockwise about shaft 128. Therefore, in FIG. 1, the gear 46 provided on the shaft 47 is separated from the gear 45 of the flywheel 42.

Also, at this time, the recess 120h of the elongated hole 120d of the slider 120 (Fig. $8) and the recess 121g of the elongated hole 121d of the slider 121 (Fig. 9) overlap, and these 105b. To this end, in FIG.
The pressing force applied to b, 33b is released, and the main brake 32
The main brake 33 is rotated counterclockwise with respect to the shaft 103, and the main brake 33 is rotated clockwise with respect to the shaft 104 to brake the reel stand device 2.3. Additionally, along with this, the main brake control arm 105
In the figure, the shaft 106 is rotated counterclockwise until it comes into contact with the recess 121g in the elongated hole 121d of the slider 121.

Due to this operation, even if the mode switching gear 55 is in the fast forward or rewind mode, these modes are not set.

Furthermore, as the slider 121 moves in the direction of arrow B' as described above, the pin 12 that is planted on the arm 125
5a relatively moves along the straight part of the long length 121b of the slider 121, but the slider 121 is moved by direct spinning of the bent part.
stops, and the arm 125 does not rotate about the shaft 138 due to the movement of the slider 121.

Note that by moving the slider 121 in the direction of the arrow B', the pin 141a) of the arm 141! Since the arm 141 is released from the thin end hole (FIG. 9) of the long hole 121e of the slider 121, the arm 141 can rotate counterclockwise with respect to the shaft 140.

When the mode switching gear 55 rotates due to the rotation of the loading motor 60 and the pulley 52, the slider 120
further moves in the direction of arrow B, and the bent portion x2oi provided on the slider 120 engages with the protruding portion 124C provided on the arm 124 and stops. In this state, the slider 120 and the arm 124 are integrated, and the arm 124 is coupled to the slider 122 via the pin 133. Furthermore, since the arm 123 is mounted on the slider 122, these sliders 120, 122 and Arms 123 and 124 are integrated.

This state is the loading stop state (hereinafter referred to as L-5
FIG. 12 shows the state of the main parts of the control means when the L-8 TOP mode button is pressed.

Next, the operation of the main parts of the control means when transitioning from this L/5TOP mode to a mode in which fast forwarding and rewinding is performed by 5 times in the loading state, that is, loading fast forwarding and rewinding mode (hereinafter referred to as L@FR mode) t, 12th
This will be explained using the drawings and FIG. 13. Note that FIG. 13 shows the state of the main parts of the control means in the L-FR mode.

To shift from L@5TOP mode to L-FR mode, pulley 52 of loading motor 6 is moved in the state shown in FIG.
rotates counterclockwise in FIG.

As a result, in FIG. 12, the gear 117 is moved by the arrow D'
In addition, the slider 120 is moved in the direction of arrow B' by the mode switching gear 55 (FIG. 6). At this time, the bent portion 1201 of the slider 120
Since the slider 120 is engaged with the protrusion 124c of the slider 120
and the arm 124 are integrated, and the slider 120
At the same time, the arm 124 moves in the direction of arrow B'. Along with this, the slider 122 and arm 123 also move in the direction of arrow B'.

By moving the slider 122, the main brake control arm 1
The contact position of the bent portion 105 of the 05 tlNlN slider 122 moves from the arm portion 122f to the recessed portion 122d, thereby causing the main brake control arm 105 to move from the shaft 7) 106
Rotate clockwise about.

The state shown in FIG. 2 is reached in which the main brake 32.33 is separated from the reel stand device 2.3.

Furthermore, by moving the slider 122 in the direction of arrow B', F
Pin 59 installed in arm 59 of R control block FRB
b comes into contact with the step 1122e of the slider 122, which causes the arm 59 to rotate clockwise about the shaft 128. When the arm 59 rotates in this manner, the arm 60 also rotates clockwise due to the coiled spring 139 (FIG. 11), thereby causing the gear 45 of the flywheel 42 and the shaft 47 provided in FIG. and the gear 46 meshes with each other.

This state is the state shown in FIG. 13, and now the L-FR
The mode is now set.

In FIG. 12, as the slider 122 moves in the direction of the arrow B', the arm 123 also moves in the direction of the arrow B', and its tip 123c comes into contact with the serrated gear part 117a of the gear 117. 117 is rotating in the direction of arrow D', the arm 123 is also biased clockwise with respect to the pin 134 by the tension spring 136, so the tip 123c of the arm 123
along with the rotation of the serrated gear 117a,
As a result, the arm 123 only vibrates and rotates about the pin 134.

The quick brake mode when transitioning to the next [, L@FR-i needle to L-8TOP%-)"
This will be explained using FIGS. 2 and 13.

In the state shown in FIG. 13, when the pulley 52 of the four-way motor 6 rotates clockwise in FIG. 6, the mode switching gear 55 rotates counterclockwise in FIG. rotates in the direction of the arrow. As a result, the serrated gear portion 117a of the gear 117 is connected to the arm 123.
and pushes the arm 123 in the direction of arrow C' against the biasing force of the tension spring 136. For this purpose, it fits into the elongated hole 123a of the arm 123.

Pin 134 planted on slider 122 and slider 1
The arm 123 moves in the force direction of arrow C' while being guided by the bent protrusions 122h and 1221 provided on the arm 22.

When the arm 123 moves in the force direction of arrow C', the boss 123d provided on the arm 123 suppresses the tip 124aY of the arm 124, thereby causing the arm 124 to
It resists the biasing force of the tension spring 137 and rotates counterclockwise about the pin 133.

Accordingly, the engagement between the bent portion 120i (FIG. 8) provided on the slider 120 and the protruding portion 124C provided on the arm 124 is released, and the arm 124 is released from the slider 120.

Therefore, as shown in FIG. 12, the biasing force of the tension spring 137 acts on the arm 124, and the arm 124, together with the slider 122 and the arm 123, moves until the end of the elongated hole 122a of the slider 122 comes into contact with the shaft 131.
Move in the direction of arrow B. This movement of the slider 122 causes the stepped portion 122e of the slider 122 to separate from the pin 59b planted on the arm 59 of the FR control block FRB, and the arm 59 is released from the restraint by the stepped portion 122e. When the arm 59 is restrained by the stepped portion 122e, the gear 46 in FIG. 1 meshes with the gear 45 of the flywheel 42 due to the biasing force of the coiled spring 139 (FIG. 11), so that the gear 46 in FIG. The arm 60 is in a state of maximum rotation relative to the shaft 128, and the belt 49 is tensioned in FIG.

However, when the arm 59 is released from the restraint by the stepped portion 122e, the arm 59 rotates counterclockwise (clockwise in FIG. 12) about the shaft 128 due to the biasing force of the coiled spring 139 in FIG. Along with this, the arm 60 is released from the restraint by the biasing force of the coiled spring 139, and therefore rotates in the same counterclockwise direction as the arm 59 due to the tension of the belt 49 (FIG. 1). As a result, the gear 46 in FIG. 1 is separated from the gear 45 of the flywheel 42, and the driving of the reel stand device 2 or 3 via the belt 49 is stopped.

Furthermore, as the slider 122 moves in the direction of arrow B, the bent portion 1 provided on the main brake control arm 105
05bt! The slider 122 is released from the concave portion 122d and comes into a state facing the cam portion 122f. For this,
In FIG. 2, the protrusion 32b of the main brake 32.33
, 33b is no longer applied to the main brake control arm 105, and due to the biasing force of the tension spring 102, the main brake 32 is moved counterclockwise with respect to the shaft 103.
The main brakes 33 each rotate clockwise relative to the shaft 104 and brake the reel stand devices 2.3, respectively. At this time, the main brakes 32 and 33 rotate as described above, and as shown in FIG.
The main brake control arm 105 rotates counterclockwise with respect to the shaft 7) until it abuts the cam portion 122f of the slider 122.

Further, the arm 123 also moves in the direction of arrow B, and its tip 123C is removed from the sawtooth gear portion 117a of the gear 117. Therefore, the arm 123 is moved as before by the biasing force of the tension spring 136.

It moves in the direction of arrow C while being guided by pins 134 and the like. Therefore, the tip end 124a of the arm 124 is connected to the arm 1.
The pressure by the boss 123d of No. 23 is released, and therefore, the arm 124 rotates clockwise due to the biasing force of the tension spring 137.

On the other hand, due to the 550 rotations of the mode switching gear, the slider 12
0 also moves in the direction of arrow B and stops at a position where its bent portion 120i (FIG. 8) faces the protruding portion 124d of the arm 124. Therefore, due to the clockwise rotation of the arm 124 due to the biasing force of the tension spring 137, these bent portions 1
20i and the protruding portion 124C are engaged, and the arm 124 and the slider 120 are coupled together as originally. The engagement between the bent portion 1201 and the protruding portion 124C is caused by the tension spring 1
It is held by a biasing force of 37.

As described above, the gear 45 of the flywheel 42,
The gear 46 (FIGS. 1 and 2) that rotates integrally with the pulley 63 is separated, and the transmission of rotation to the reel stand device 2.3 is released, and the main brake control arm 105 Pressure is released and main brake 32.3
3 is crimped onto the brake crimping outer peripheral portion 93 (FIG. 1) of the reel stand 89 of the reel stand device 2.3 (FIG. 2), and the brake is applied to the reel stand device 2.3.

In this way, when shifting from the L,5TOP mode to the L/FR,mode, the gear 46 meshes with the gear 45 of the flywheel 42 in FIG.
The capstan motor 5 is directly connected to the reel stand 89 of the reel stand device 2 (or 3) from the FR idler gear 82 via the
The zero rotation is transmitted, and the main brake 32 (and 33) is released from being pressed against the brake pressing outer circumferential portion 93 of the reel stand 89, and fast forwarding or rewinding operation is performed.

On the other hand, when shifting from the L/FR mode to the LΦ5TOP mode, the gear 46 is disengaged from the gear 45 of the flywheel 42, the rotation is no longer transmitted to the reel stand 89, and the main brake 32 (and 33) are crimped, and the reel stand devices 2, 3
brake is applied.

Note that when shifting from the L, 1 STOP mode to the L@PR mode, the arm 123 moves in the direction of arrow B' from the state shown in FIG. , as explained earlier, the gear 117 rotates in the D' direction and the arm 123 only vibrates around the pin 134, so the arm 1
24 is held integrally with the slider 120 without rotating. As a result, when shifting from the L@S TOP mode to the L@FR mode, even if the tip 123C of the arm 123 comes into contact with the serrated gear portion 117a of the gear 117, the arm 122 is not affected by this. Slider 1
20 in the direction of arrow B', the brake of the reel stand device 2.3 by the main brake 32, 33 is reliably released, and 50 rotations of the capstan motor are transmitted to the reel stand device 2.3. The L/FR mode will be set.

Since the brake is applied by the movement of the slider 122,
This brake applies quickly and fast forwards.

Starting end, end end and extraction of the magnetic tape 40 in rewind mode,
The brakes are quickly applied to the reel stand device 2.3.

Next, settings for recording, playback, and search modes will be explained. These modes transition from the L-8 TOP mode shown in FIG.

In FIG. 12, the slider 121 is rotated by the mode switching gear 55 (FIG. 6) by the loading motor 6.
further moves in the B' direction. As a result, slider 1
The bent portion 105bt” of the main brake control arm 105 that was in the recess 121g of the elongated hole 121d of 21! This elongated hole 12
1d, the arm 105 rotates clockwise with respect to the shaft 7) 106 (FIG. 9).

This causes the main brakes 32, 33 to act on the reel stand device 2.
3, and the brakes for each are released. Further, since the slider 120 does not move, the pin 59b planted on the arm 59 of the FR control block FRB is attached to the slider 1.
22, so that the arm 59.60 is rotated clockwise with respect to the shaft 128, and the gears 45 and 46 of the flywheel 42 (FIG. 1) are in mesh with each other. It remains unlocked.

On the other hand, since the slider 121 has moved in the direction of arrow B' from the state shown in FIG.
The pin 125at' of the arm 125 that was in the straight part of the arm 21b (FIG. 9)! , enters and retreats into the bent portion of the elongated portion 121b, thereby causing the arm 125 to rotate counterclockwise with respect to the shaft 138.

Therefore, the bottle 125b installed on the arm 125 is
It engages with the groove 79b of the arm 79 and fixes the PR arm 79. In this state, in FIGS. 1 and 4,
PR mounted on FR arm 79 via shaft 80Y
Idler gear 82 is fixed in position. F at this time
The position of the R idler gear 82 is such that its center (that is, the shaft 80) is on the bisector of the straight line connecting the centers of the reel stand device 2.3 shown in FIG.
The idler gear 82 is in a position where it does not mesh with any of the reel stand 890PR gears of the reel stand device 2.3.

Therefore, the rotation of the capstan motor 5 is as follows.

In FIG. 1, flywheel 42→pulley 42a→
Belt 48 → Pulley 50 → Idler gear 70.76.7
5→winding sight gear 99→transmitted to reel stand 89 only via clutch plate 101.

As a result, the recording, playback, or search mode is set, and the reel stand 89 is rotationally driven by the capstan motor 5, which rotates at a speed corresponding to each mode.

When changing from the recording, playback or search mode to the L@5TOP mode, the rotational direction of the loading motor 60 is reversed and the slider moves in the direction of arrow B, resulting in the state shown in FIG.

Next, when shifting from the L@5TOP mode to the eject mode shown in FIG. 12, the gear 117 rotates in the direction of arrow D', the mode switching gear 55 also rotates, and the slider 1
20 moves in the direction of arrow B', and along with this slider 1
22. The arms 123 and 124 also move together in the direction of arrow B' to enter the L-PR mode shown in FIG. 13, but as the mode switching gear 55 further rotates, the slider 121 moves in the direction of arrow B. Moving. As a result, the slider 1210 cam 121 (see FIG. 9) comes into contact with the bin 124d provided on the arm 124 and pushes it away, so that the arm 124 rotates counterclockwise with respect to the bin 133. .

Due to this rotation of the boo 41240, the protrusion 124C provided on the arm 124 is disengaged from the bent portion 120i provided on the slider 120, and as a result, the tension spring 1
Due to the biasing force 37, the arm 124 moves together with the slider 122 and the arm 123 in the direction of arrow B until it reaches the state shown in FIG.

On the other hand, in FIG. 13, as mentioned above, the slider 12
1 moves in the direction of arrow B and the slider 122 moves in the direction of arrow B, the bottle 59b planted on the arm 59 of the PR control block FRB is removed from the stepped portion 122e of the slider 122. Slider 1
The arm 59.60 is in contact with the protrusion 121i (FIG. 9) of the long hole 121e of the arm 59. . Therefore, in FIGS. 1 and 2, the gear 46 is in mesh with the gear 45 of the flywheel 42.

Furthermore, the bent portion 105b of the main brake control arm 105 separates from the cam portion 122f of the slider 122, and the bent portion 121h' of the elongated portion 121d of the slider 121.
(Fig. 9).

The main brake control arm 105 is held rotated clockwise relative to the shaft 7) 106. To this end, in FIG. 2, the main brakes 32 and 33 apply the brakes to the illustrated reel stand device 2.3 by having their protrusions 32b, 33b pressed by the main brake control arm 105. There will be no.

In this state, the unloading operation starts, but the capstan motor 5 also rotates at a predetermined speed, and the FR idler gear 86 rotates counterclockwise.

For this purpose, the FR arm 79 (FIG. 4) rotates counterclockwise, and the PR idler gear 82 meshes with the reel stand device 2 on the supply side. The rotation of the FR idler gear 86 is transmitted to the reel stand device 2 via the FR idler gear 82, and the rotation of the magnetic tape 40 during the unloading operation is transmitted to the reel stand device 2.
The 2L barrel is wound up on the side of the reel stand device 2.

When the unloading operation is completed, each member of the control means reaches the position shown in FIG. 6, and all operations are completed.

As described above, rotation is transmitted to the reel stand device through different rotation transmission systems in modes such as recording, playback, and search, fast forwarding and rewinding, and removing slack from the magnetic tape during unloading. The belt torque Y for each belt can be set independently from the other. In this case, fast forward 1
Since the rotation transmission system for rewinding and taking up slack is not operated in any mode other than these, power consumption can be significantly reduced.

In addition, since the rotating bodies are coaxially provided between these two rotation transmission systems, the planar space can be reduced and the VT
Since R can be made smaller and the number of holes in the board can be reduced, the mechanical strength of the board is also increased.

Furthermore, regarding control of the main brake, as is clear from the operation of the control means described above, when converting from fast forward or rewind mode to loading stop mode, slider 1
22 (FIG. 6).

Conventional VTRK main brake control is, for example,
As disclosed in Japanese Patent Application Laid-open No. 58-147835,
If the plunger is not used, cost, weight,
Although improvements are made in terms of space and operation noise, there is a problem with the operating speed of the main brake because the control of the main brake is also performed in conjunction with the rotational operation of the mode switching gear. In particular, the V of the shed called 8mm video
In TR, in the L6FR mode, the tape leader section at the end of the magnetic tape is optically detected, and the 5T
When switching to OP mode, the length of this tape leader section is relatively short. For this reason, unless the time from detecting the tape leader to stopping the magnetic tape is made as short as possible, the magnetic tape will be completely wound up and stretched between both tape reels, causing excessive stress on the magnetic tape. Tension will be added. As a result, not only the ends of the magnetic tape are damaged, but also the magnetic head attached to the rotating cylinder is shocked and damaged.

On the other hand, with the control means of the present invention, the brakes are quickly applied as described above, and the above problem does not occur.

[Effects of the Invention] As explained above, according to the present invention, there are two different rotation transmission systems to the reel stand device, so one requires strong torque for fast forwarding, rewinding, etc. One mode can be used as a rotation transmission system, and the other can be used as a rotation transmission system for modes that require weak torque such as recording and playback, and belt tension Y can be set according to each torque, reducing power consumption. In addition, since each rotation transmission system is arranged coaxially, the planar space can also be reduced, which solves the problems of the above-mentioned conventional technology and provides a reel stand drive device with excellent functions. can be provided.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the reel stand driving device according to the present invention, FIG. 2 is a plan view thereof, FIGS. 3 and 4 are plan views showing the idler portion in FIG. 1, and FIG. is a side view of the idler portion shown in FIG. 4, FIG. 6 is a plan view showing a specific example of the control means of the embodiment shown in FIG. 1, and FIG. 7 is a specific example of the mode switching gear shown in FIG. 6. A plan view showing an example, FIG. 8 is a plan view showing the first slider Z in FIG. 6, FIG. 9 is a plan view showing the second slider in FIG. 6, and FIG. 10 (5)
, (B) is a plan view and a side view showing the third slider and the arm mounted thereon in FIG. 6, and FIG. 11 is a plan view showing the main brake control arm χ in FIG. 6, and FIG. 13 is an explanatory diagram of the operation of the main part of the control means shown in FIG. 6, FIG. 14 is a plan view showing the mechanical system provided on the front side of the board of the video tape recorder, and FIG. 15 is a diagram of the video tape recorder. FIG. 16 is a plan view showing the state of the mechanical system when the tape cassette is attached, and FIG. 16 is a plan view showing the mechanism provided on the back side of the board compared to FIG. 14. 1... Board, 2.3... Reel stand device, 5... Capstan motor, 5a...
・Pulley, 6...Loading motor, 42・
...Flywheel, 42a...Pulley, 44...Belt, 45.46...Gear, 47...Shaft, 48,49.・・・・・・
・Bell), 50.51...Pulley%55...
...Mode switching gear, 63...Pulley, 69
...shaft, 70 ... idler gear, 71 ... shaft, 72 ... arm, 74 ... shaft, 75, 76 ... ...
Idler gear, 79...FR arm, 80...
...Shaft, 81...Felt, 86.
...FB idler gear, 89...Reel stand, 92...PR gear, 99...Take-up gear, 100...Felt, 101. ...
...Clutch plate. Fig. 7 Fig. 8 Fig. '911 Fig. 1I 6υ

Claims (1)

[Claims] 1. First and second rotating bodies rotatably provided on a shaft provided on a perpendicular bisector of a line connecting the centers of a pair of reel stand devices; first and second arms that are movably provided; a third rotating body that is rotatably provided on the first arm and rotates by rotation of the first rotating body;
a fourth rotating body that is rotatably provided on the arm and rotates by the rotation of the second rotating body; a first rotating body that transmits rotation of a motor capable of forward and reverse rotation to the first and second rotating bodies; a second rotation transmitting means, which transmits the rotation of the motor directly from the third rotating body to one of the reel units of the reel unit, and from the fourth rotating unit to one of the reel units of the reel unit. A reel stand driving device characterized in that the rotation of the motor can be transmitted to the reel stand via a torque limiter. 2. The reel stand driving device according to claim 1, wherein the first arm is a swinging arm that rotates in a direction corresponding to the rotational direction of the motor.