JPH0619875B2 - Reel stand drive - Google Patents

Description

The present invention relates to a so-called 1-motor drive type magnetic recording / reproducing apparatus for driving a reel base device with a capstan motor, and particularly to driving the reel base device. The present invention relates to a reel base drive device.

[Conventional technology]

Helical scan magnetic recording / reproducing device (hereinafter referred to as VT
As a reel base driving device (referred to as R), a system using a DD motor that directly drives a capstan as disclosed in Japanese Patent Laid-Open No. 58-112168 and a method disclosed in Japanese Patent Laid-Open No. 58-88852. As described above, there is a method of using a motor that drives a capstan for feeding the magnetic tape at a constant speed.

[Problems to be solved by the invention]

In the former reel system driving device, the VTR
However, there is a problem in that the rotary system is arranged in a plane and the space on the plane becomes considerably large. Further, in consideration of power saving, the power transmission from the DD motor to the reel base driving device is performed by a timing belt. However, the timing belt is
Since it is not an elastic component, it needs to be adjusted when it is attached, and the timing belt expands and contracts due to temperature changes, and the lateral pressure increases, resulting in increased wah, flutter, and jitter. There is a problem in the performance of the VTR, and in terms of cost, the timing belt is several times more expensive than the rubber belt, which causes the cost up of the VTR.

The reel stand drive device of the latter method is very simple in terms of operation of the mechanism, and is suitable in terms of downsizing of the mechanism. However, as in the former reel drive device using the former method, the tension of the belt to which the power from the capstan motor is transmitted is set according to the strong torque during fast-forwarding and rewinding, and the frequency of use Even at the time of the highest recording / reproducing, the lateral pressure due to this tension is exerted on the motor, so there is still a problem in power saving.

In particular, these problems must be urgently solved for a VTR using a battery such as a portable type or a camera integrated type.

The object of the present invention is to solve the problems of the prior art,
It is an object of the present invention to provide a reel base drive device that can realize the downsizing of TR, power saving, and cost reduction.

[Means for solving problems]

To achieve this object, the present invention relates to a first rotating member that transmits power from a drive motor to a reel stand device during recording, reproduction, and search, and fast drive, rewind, and slack removal of a magnetic tape from the drive motor. A second rotating member for transmitting power to the stand device is provided, and the first and second rotating members are provided on a vertical bisector of a line connecting the pair of reel stands, and
Collect between the reel stands.

[Work]

The space occupied by these first and second rotating members is reduced, and the control of the first and second rotating members by the link system is facilitated, and recording, reproduction, search, fast-forward,
Only one of the first and second rotating members is rotated according to each mode of rewinding and slackening to reduce power consumption.

〔Example〕

First, a VT to which the reel base driving device according to the present invention can be applied
The mechanical system of R will be briefly described with reference to FIGS. 14 to 16.

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

In the figure, on the substrate 1, there are reel stand devices 2 and 3 in the lower part of the drawing, a rotary cylinder 4 in the upper part of the central part, a capstan motor 5 in the upper right corner, and a rotating part in the left part. Motors 6 are provided respectively. Rotating cylinder 4
The guide grooves 7 and 8 are provided around the
The guide groove 9 is further branched from the middle of. One ends of the guide grooves 7 and 8 are close to the reel base devices 2 and 3, and stop members 10 and 11 having V-shaped grooves 10a and 11a are provided at the other ends, respectively. 9 extends near the upper left corner of the drawing and has a V-shaped groove 12a at its end.
A stop member having is provided.

A tape pullout member 13 having a position regulating pin 14, a guide roller 15 and a guide pin 16 mounted thereon is movably mounted along the guide groove 7, and a tape having a position regulating pin 18, a guide roller 19 and a guide pin 20 mounted thereon. A pull-out member 17 is movably mounted along the guide groove 8, and further, a pull-out roller 21 is movably mounted along the guide groove 7 from the end on the reel stand device 2, 3 side and then along the guide groove 9. Is provided. When the magnetic tape (not shown) is not wound around the rotary cylinder 4, the tape pull-out members 13 and 17 and the pull-out roller 21 are on the reel stand devices 2 and 3 side of the guide grooves 7 and 8, respectively.

On the left side of the drawing, a tension arm 22 having a tension pin 23 planted at its tip is rotatably provided. By rotating the tension arm 22, a brake shoe 24 is provided.
Is controlled to change the braking force applied to the reel stand device 2. Further, an inclined pin 25, a full width erasing head (not shown), and an impedance roller 26 are provided.
On the right side of the drawing, a pinch roller arm 28 is rotatably provided on a shaft 27 planted in the substrate 1, and the pinch roller arm 28 is rotatably provided at the tip of the pinch roller arm 28.
9 is provided. Also, the capstan 30 is the substrate 1.
The capstan 30 is rotatably provided integrally with a flywheel (not shown) attached to the back side of the capstan 30. The capstan 30 is rotated by the capstan motor 5 rotating the flywheel. When the pinch roller arm 28 rotates clockwise in the drawing, the pinch roller 29 contacts the capstan 30. Further, a guide pin 31, a voice head, and a control head (not shown) are provided.

The rotary cylinder 4 is rotationally driven by a cylinder motor 4 (not shown), and the tape pull-out members 13 and 17 and the pull-out roller 21 are guided by the loading motor 6 into guide grooves 7 and 8.
Or move along 9. Capstan motor 5
As described above, serves as a drive source for the capstan 30, but also serves as a drive source for the reel base devices 2 and 3. The main brakes 32, 33 are activated during a stop in the loading state or during a recording pause (when recording is temporarily stopped), and stop the reel stand devices 2, 3.

FIG. 14 shows a state in which the tape cassette is not attached. Next, the state in which the tape cassette is attached and the 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 posts, 40 is a magnetic tape, 41 is a full-width erasing head, and 42 is a flywheel. Four
Reference numeral 3 is a voice head, and parts corresponding to those in FIG. 14 are designated by the same reference numerals.

A supply reel 35 and a take-up reel 36 are provided on the tape cassette 34, and a magnetic tape 40 is stretched between them via guide posts 38 and 39 as shown by a chain line. When the tape cassette 34 is inserted from an insertion opening (not shown) and mounted at a predetermined position on the substrate 1, the supply reel 35 is moved to the reel stand device 2 (FIG. 14).
Then, the take-up reels 36 are attached to the reel stand device 3 (FIG. 14), respectively, and the lid (not shown) provided on the tape cassette 34 is opened, and the opening 37 is exposed to expose the guide post 3.
Between 8 and 39, the magnetic tape 40 crosses the opening 37. At this time, the tape pull-out members 13, 17 and the pull-out roller 21 are located inside the magnetic tape 40 in the opening 37. When the tape cassette 34 is mounted at a predetermined position on the substrate 1 as described above, a switch (not shown) is activated to rotate the loading motor 6, and the tape pull-out member 13 causes the guide groove 7 to move. Along
The tape pull-out member 17 moves along the guide groove 8 and the pull-out roller 21 moves along the guide groove 7 and along the guide groove 9 from the middle thereof in the direction indicated by the broken arrow to start the loading operation. At this time, the guide roller 15 and the guide pin 16 mounted on the tape pull-out member 13 and the guide roller 19 and the guide pin 20 mounted on the tape pull-out member 17 are caught on the magnetic tape 40 and once pulled out from the tape cassette 34. Further, the pull-out roller 21 is caught on the magnetic tape 40 from the middle.

Then, the position regulation pin 14 mounted on the tape pull-out member 13 is fitted into the V-shaped groove 10a of the stop member 10, the tape pull-out member 13 is pressed by the stop member 10, and the position regulation mounted on the tape pull-out member 17 is controlled. The pin 18 is the stop member 11
The tape pull-out member 17 is pressed into the V-shaped groove 11a of the stopper member 11, and the moving body (not shown) on which the pull-out roller 21 is mounted is further inserted into the V-shaped groove 1a of the stop member 12.
When 2a is engaged, the loading operation is completed here. As a result, from the supply reel 35 to the rotary cylinder 4, the pull-out roller 21, the inclined pin 25, the guide roller 15 and the guide pin 16 form an entrance side running path of the magnetic tape 40 as shown by a solid line, and From the rotary cylinder 4 to the take-up reel 36, the guide pin 20, the guide roller 19, and the guide pin 31 form a delivery path of the magnetic tape 40 as indicated by the solid line. At this time, the magnetic tape 40 is spirally wound around the rotary cylinder 4 by 180 ° or more, and the tension pin 23, the full width erasing head 41, and the impedance roller 26 are wound on the magnetic tape 40 on the entrance side running path. Abutting against each other, a control head (not shown),
The audio head 43 and the capstan 30 contact the magnetic tape 40.

Next, when the recording / playback button is pressed, the pinch roller arm 2
8 (FIG. 14) rotates, and the pinch roller 29 holds the magnetic tape 40 together with the capstan 30. The capstan 30 is rotated by the capstan motor 5 via the flywheel 42, the magnetic tape 40 runs from the supply reel 35 to the take-up reel 36, and the rotating cylinder 4
The rotating head (not shown) attached to the
Recording or reproduction 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, the braking force applied to the reel stand device (Fig. 14) is changed, and the tension of the magnetic tape 40 is kept constant. The impedance roller 26 absorbs the vibration of the magnetic tape 40. The full width erasing head 41 operates in the recording mode and erases over the entire width of the magnetic tape 40. The control head (not shown) and the audio head 43 record and reproduce the control track or the audio track on the edge of the magnetic tape 40 in the recording mode or the reproducing mode, respectively.

When unloading, loading motor 6
Rotates in the opposite direction, the tape pull-out members 13, 17 and the pull-out roller 21 move in the opposite direction, and the supply reel 35 removes the slack of the magnetic tape 40.

In the loading operation, as shown in FIG. 14, the main brake 32 or 33 is connected to the reel stand device 2 or 3.
Farther apart.

FIG. 16 is a plan view of a mechanism system including a reel base driving device according to the present invention as viewed from the back surface side of the substrate 1, in which 44 is a belt, 45 and 46 are gears, 47 is a shaft, 48 and 49 are belts, 50. , 51, 52 and 53 are pulleys, 54 is a belt, 55 is a mode switching gear, 56 is a rotary switch,
Reference numerals 57, 58 and 59 are arms, 59a is a stepped portion, 59b is a pin, 60 is an arm, 60a is a protrusion of the arm 60, and 61 is an arm. The same reference numerals are given to the portions corresponding to FIGS. 14 and 15. I am wearing it.

In FIG. 16, the rotation of the capstan motor 5 is transmitted via the belt 44 to the flywheel 42 on which the capster 30 (FIG. 15) is planted. Flywheel 4
The belt 48 is stretched between the pulley 2 and the pulley 50, and the belt 49 is stretched between the pulley 46 and the gear 46 which is meshable with the gear 45 provided on the flywheel 42. The pulley 50 rotates with the rotation of the stun motor 5, but the pulley 51 rotates only 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 a pulley 51, and the pulley 50 is driven in accordance with an operation mode such as recording, reproducing, fast-forwarding or rewinding. And the pulley 51 is selected. The selection of the pulleys 50 and 51 is made by the mode switching gear 55. That is, the mode switching gear 55 includes the pulley 52, the belt 54, and the pulley 5 of the loading motor 6.
3 and the gear mechanism to be described later, it is rotated by the loading motor 6, and as the mode switching gear 55 is rotated, the arms 57 and 58 are rotated and the arm 5 is rotated.
The gears 45 and 46 of the flywheel 42 are moved by the rotation of the shafts 9 and 60 and the movement of the shaft 47 provided on the arm 60.
The engagement and disengagement of the drive force transmission system and the drive force transmission system via the pulley 51 are controlled. The above points outline the reel stand drive device of the present invention.

Next, an 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 62a and 62b.
Is a radial receiving part, 62c is a thrust receiving part, 63 is a pulley, 64 is a felt, 65 is a compression spring, 66 is a plate, 66 is a plate, 67 and 68 are bearings, 69 is a shaft shifter, 70 is an idler gear, 71 is a shaft shift, 72 is an arm, 72a is an end portion, 73 is a stopper, 74 is a shutter, 75 and 76 are idler gears, 76a and 75b are gear parts, 77 is a plate, 78 is a bearing, 79 is a FR (fast / rewind) arm, 80 is a shaft, 81 is a felt, 82 is an FR idler gear, 83 is a compression spring, 84 is a spring bearing, 85 is a bush, 86 is an FR idler gear, 87 is a washer, 8
8 is a shaft, 89 is a reel stand, 90 is a thrust receiving screw, 91 is a screw part, 92 is an FR gear, 93 and 94 are external parts for brake crimping, 95 is a clutch spring, 96 is a clutch, 96 'is a cap, 97 is a A spring receiver, 98 is a torque spring, 99 is a winding gear, 100 is a felt, and 101 is a clutch plate. In FIG. 2, 5a is a motor pulley, 32a is a hook portion, 32b is a protrusion, 33a is a hook portion, 33b is a protrusion, 102 is a tension spring, and 10 is a spring.
3, 104 is a shaft, 105 is a main brake control arm, 105a is a pin, and 106 is a shaft. In addition,
The same reference numerals are given to the portions corresponding to the respective portions of the above drawings.

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

The flywheel 42 has a pulley 42 a 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 substrate 1, and its radial receiving portions 62a and 62b support the capstan 30 in the radial direction, and the thrust receiving portion 6 thereof is provided.
2c supports the capstan 30 in the thrust direction.

A gear 46 that can be engaged with and released from the gear 45 of the flywheel 42 is rotatably attached to a shaft 47 installed in 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 compression spring 65 causes the gear 46 to move the felt 64 to the pulley 63. I'm pressing it. Further, although detailed description is omitted, when a pressure is applied by the arm 64 (FIG. 16) in the direction of arrow A, the rotation of the gear 46 is transmitted to the pulley 63 via the felt 64. When there is no rotation, the rotation of the gear 46 is directly transmitted to the pulley 63.

On the other hand, bearings 67 and 68 are attached to 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 48 is stretched between the pulley 50 and the pulley 42a of the flywheel 42, and the rotation of the flywheel 42 is transmitted to the idler gear 70.

The bearing 68 rotatably supports the shaft 71, and the pulley 51 is press-fitted into the shaft 71. A belt 49 is stretched between this pulley 51 and a pulley 63 provided on the FR control block FRB. The shaft 71 is rotatably provided with a two-stage gear idler gear 76, and one gear portion 76 a 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. An end 72a of the arm 72 is bent in a U shape, and a shaft 74 is planted therein, and an idler gear 75 is rotatably attached to the shaft 74. The idler gear 75 meshes with a gear portion 76b of an idler gear 76 attached to the shaft 71.

From the above, the rotation of the flywheel 42 is transmitted to the idler gear 75 via the belt 48, the pulley 50, the gear 70 and the idler gear 76.

FIG. 3 is a plan view showing a part of the arm 72, and 66
a and 66b are bent portions, 72b is a bent portion, 72c is an opening portion, 72d is a bent portion, 107 and 108 are tension springs, 1
09 is a shaft, 110 is an arm, 110a, 110b
Is a bent portion, 111 is a pin, and the same reference numerals are given to the portions corresponding to FIG.

In FIG. 3, a bending portion 66a provided on a fixed plate 66 and an arm 7 which is rotatable with respect to a shaft 71.
A tension spring 107 is hooked between the second bent portion 72b and the second bent portion 72b, whereby the arm 72 is biased clockwise. Further, a shaft 109 is planted on the plate 66, and the bent portion 110b of the arm 110 rotatably attached thereto and the bent portion 66b provided on the plate 66.
A tension spring 108 is applied between the arm 110 and the arm 110, and the arm 110 is urged in the counterclockwise direction by the tension spring 108. The pin 111 provided on the arm 110 is provided in the arm 72 and has a substantially triangular opening. The one end of the portion 72c is engaged, and the biasing force of the tension spring 108 is applied to the arm 110 via the arm 110.
Is pulled in the counterclockwise direction, the rotation of the arm 72 is locked.

Returning to FIG. 1, the shaft 71 is further rotatably provided with a bearing 78 to which a plate 77 is fixed. The plate 77, as shown in FIG.
It is fixed to the plate 66 by a and 112b.
In this plate 77, the idler gear 75 is a shaft 74
It also prevents you from getting out.

A FR arm 79 is rotatably attached to the outer periphery of the bearing 78, and an FR idler gear 82 is attached to the FR arm 79.
A shaft 80 to which is attached is provided, and a felt 81 is provided between the FR idler gear 82 and the FR arm 79.
Is provided. A spring receiver 84 is provided in the shaft 80. A compression spring 83 is provided between the spring receiver 84 and the FR idler gear 82, and a bush 85 for retaining is press-fitted into the shaft 80, so that the biasing force of the compression spring 83 is exerted. The FR idler gear 82 is pressed against the FR arm 79 side.

On the other hand, the FR idler gear 86 is D-cut coupled to the shaft 71 so as to rotate integrally with the shaft 71.
A washer 87 is fitted to the tip of the No. 1 to prevent the FR idler gear 86 from coming off. This FR idler gear 86
Engages with an FR idler gear 82 provided on the FR arm 79.

From the above, from the pulley 63 of the shaft 47 provided on the FR control block FRB to the belt 49, the pulley 51,
The rotation is transmitted to the FR idler gear 82 via the shaft 71 and the FR idler gear 86.

The FR arm 79 has a triangular opening 79a at its end and a groove 79b at one end of the opening 79a, as shown in FIG. 4 and FIG. 5 showing its side surface. Usually, as will be described later, a predetermined protrusion engages with the groove 79b, and the FR arm 79 is prevented from rotating.

Next, the reel stand devices 2 and 3 will be described. However, since the reel stand devices 2 and 3 have the same configuration, the reel stand device 2 on the supply side will be described here.

The reel base device 2 is rotatable about a shaft 88 that is set up on the substrate 1. The shaft 88 is always in contact with the shaft 88 and the thrust receiving screw 90 at the upper part thereof, and a screw portion 91 for screwing the reel base 89 and the thrust receiving screw 90 to each other is provided to rotate the thrust receiving screw 90. The height of the reel stand device 2 can be adjusted by moving the reel stand 89 up and down. Further, the FR idler gear 82 is attached to the reel base 89.
An FR gear 92 capable of meshing with and external parts 93 and 94 for pressing various brakes are provided.

A clutch 96 is urged upward by a clutch spring 95 and engages a supply reel 35 (Fig. 15) of the tape cassette 34 (Fig. 15) on the upper portion of the reel base 89.
In order to prevent the clutch 96 from coming off, the cap 96 ′ is press-fitted into the upper end portion of the reel base 89.

Below the reel base 89, a spring receiver 97 and a winding gear 9 are provided.
9 is rotatably inserted, and a torque spring 98 is inserted between them.
Is provided. The clutch plate 101 is press-fitted between the shaft 88 and a part of the reel base 89,
Is made integral with the clutch plate 101, and the felt 1 is provided between the clutch plate 101 and the winding gear 99.
00 is provided. The wind spring 99 and the clutch plate 101 sandwich the felt 100 by the torque spring 98. The winding gear 99 meshes with the idler gear 75. The take-up gear 99, the felt 100 and the clutch plate 101 constitute a torque limiter.

The rotation of the supply reel base 2 is performed via two types of rotation transmission systems. One is that the rotation is directly transmitted from the FR idler gear 82 to the reel base 89, and the rotation is transmitted from the idler gear 75 to the reel base 89 through the torque limiter including the winding gear 99, the felt 100 and the clutch plate 101. When the FR idler gear 82 is meshed with the FR gear 92 of the reel mount 89, another mechanism is used to drive the idler gear 75 and the reel mount 89.
The rotation transmission system between them is cut off, and the FR idler gear 82 directly drives the reel base 89 to rotate.

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

(a) Recording, reproduction, and search mode: The flywheel 42 rotates in such a manner that the pulley 42a → belt 48 → pulley 50 → shaft 69 → idler gear 70.
→ idler gear 76 → idler gear 75 → take-up gear 9
9 → Felt 100 → Transmitted to the reel base 89 through the clutch plate 101, and the reel base 89 rotates while slipping between the winding gear 99 and the felt 100. The brake shoe 24 (FIG. 14) is brought into contact with the brake press-fitting external portion 93 of the reel base 89.
0 is multiplied by a backup.

In this case, the idler gear 75 is the supply side reel stand device 2
3 and 4, the bending portion 110b of the arm 110 is pushed in the direction of the arrow by the member not shown in FIG. 3 and FIG. 4, and the arm 110 is rotated clockwise with respect to the shaft 109. Move the arm 110
The engagement between the pin 111 and the opening 72c of the arm 72 is released, and as a result, the urging force of the tension spring 107 causes
This is because the arm 72 rotates clockwise with respect to the shaft 71. Next, the pin 111 of the arm 110
When the bent portion 72d of the arm 72 is pressed in the direction of the arrow while the engagement between the arm 72 and the opening 72c of the arm 72 is released, the arm 110 rotates counterclockwise, and as a result, the arm 72 Rotates counterclockwise to rotate the idler gear 7
Reference numeral 5 meshes with the winding gear 99 of the reel base device 3 on the winding side. At this time, the rotation of the idler gear 75 is transmitted to the reel base device 3 on the winding side.

(b) Tape slack removal during fast-forwarding, rewinding, and tape unloading: At this time, the gear 45 provided on the flywheel 42 and the gear 46 provided on the shaft 47 mesh with each other by the operation of the FR block FRB described later. Then, the rotation of the flywheel 42 is transmitted to the reel base 89 via the gear 45, the gear 46, the pulley 63, the belt 49, the pulley 51, the shaft 71, the FR idler gear 86, the FR idler gear 82, and the FR gear 92.

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

That is, in FIG. 4, the FR idler gear 8 is now
When 6 rotates in the clockwise direction, a force for moving the FR idler gear 82 to the right acts on the FR idler gear 82, which causes the FR arm 79 to rotate clockwise about the shaft 71. Therefore, as is clear from FIG. 2, the FR idler gear 82 meshes with the gear of the reel base of the reel base device 3 on the winding side (corresponding to the FR gear 92 of the reel base 89 of FIG. 1). As a result, the reel stand device 3 is rotated clockwise to fast forward the tape.

On the contrary, when the FR idler gear 86 rotates counterclockwise, the FR arm 79 rotates counterclockwise in FIG. 4 and the FR idler gear 82 moves the FR gear 92 of the reel base 89 of the reel base device 2 on the supply side. Mesh with. As a result, the reel base device 2 rotates counterclockwise in FIG.

In this way, either one of the reel base devices 2 and 3 is selectively driven to rotate according to the rotation direction of the capstan motor 5.

As described above, the rotation transmission system for rotating the reel base devices 2 and 3 with weak torque for recording and reproduction and the rotation transmission system for requiring strong torque for fast-forwarding and rewinding are separately provided. Therefore, the tension of each belt can be set independently, and power consumption can be reduced. Moreover, the final stage member (idler gear 76) of these rotation transmission systems
And the FR idler gear 86) are coaxially arranged on the straight bisector connecting the reel base devices 2 and 3, so that members (idler gears, pulleys, etc.) that form the respective rotation transmission systems are also coaxially provided. The planar space they occupy can be reduced. As a result, power saving and miniaturization of the VTR can be achieved.

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

FIG. 6 is a plan view showing the control means of the above embodiment,
Reference numerals 113 to 119 are gears, 120, 121 and 122 are sliders, and 123, 124 and 125 are arms, and the same reference numerals are given to portions corresponding to the above drawings.

In FIG. 6, as described in FIG. 16, the belt 54 is stretched between the pulley 52 and the pulley 53 of the loading motor 6 and the rotation of the loading motor 6 is transmitted to the pulley 53. Furthermore, this rotation is gear 113-
It is transmitted to the motor switching gear 55 via 119.

As shown in FIG. 7, the mode switching gear 55 is provided with two cam grooves 55a and 55b, and the cam groove 55a includes
A pin 57a erected at the tip of the arm 57 is slidably fitted, and a pin 58a erected at the tip of the arm 58 is slidably fitted in the cam groove 55b. Arm 5
Numeral 7 is rotatably attached to the shaft 126 and arm 58 is rotatably attached to the shaft 127. Mode switching gear 5
When 5 rotates, the cam grooves 55a, 55b are located at the portions for changing the distance from the center of the mode switching gear 55 to the pins 57a, 5b.
When the 8a is positioned, the arms 57 and 58 move to the shaft 1
It rotates about 26 and 127.

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

As shown in FIG. 8, the slider 120 is substantially L-shaped and has seven elongated holes 120a to 120g. The elongated hole 120d among these has a recess 120h on one side thereof, and the elongated hole 120g has a bent portion 120i protruding from the surface of the slider 120 on one side thereof.
Is provided. In FIG. 6, oblong holes 120e, 1
Shafts 128, 129, and 130 that are erected on the substrate 1 are slidably fitted in the 20f and 120c, respectively.
As a result, the slider 120 is slidable in the arrow BB 'direction. Further, the arm 5 fitted into the cam groove 55b of the mode switching gear 55 is fitted into the long hole 120a.
The pin 58a planted in 8 penetrates slidably. Therefore, when the mode switching gear 55 rotates and the arm 58 rotates about the shaft 127, the slider 120 moves in the direction of arrow BB '.

As shown in FIG. 9, the slider 121 has six elongated holes 1
21a to 121f, of which elongated holes 121b
Is partially bent, and the long hole 121d has a recess 1 on one side thereof.
21g and the convex portions 121h and 121h 'are also formed in the long hole 12
1e is provided with a convex portion 121i on one side thereof. In FIG. 6, oblong holes 121c, 121e, 121
Shafts 130, 128, and 129 are slidably fitted to f, respectively, and the slider 121 is slidably mounted in the direction of arrow BB '.
Arm 57 fitted in the cam groove 55a of FIG.
When the pin 57a erected in the slot penetrates the slot 121a slidably and the mode switching gear 5 rotates and the arm 57 rotates about the shaft 126, the slider 121 moves in the direction of arrow BB '. Moving.

Details of the slider 122, the arm 123, and the arm 124 are shown in FIGS. 10 (A) and 10 (B).

In FIGS. 1A and 1B, the slider 122 has an elongated hole 12
2a, 122b, 122j, recesses 122c, 122d,
The step portion 122e and the cam portion 122f are provided, and the long hole 1
Shafts 131 (FIG. 6) planted on the substrate 1 at 22a.
However, in the concave portion 122c, the shaft 132 that is set up on the substrate 1 is
(Fig. 6) are slidably fitted together. As a result, the slider 122 is slidable in the direction of arrow BB 'in FIG. In addition, the long hole 122j of the slider 122
From the bending portion 120 provided on the slider 120.
i (FIG. 8) is protruding.

Further, pins 133 and 134 are erected on the slider 122, an arm 124 is rotatably attached to the pin 133, and the pin 134 is slidably fitted in an elongated hole 123a provided in the arm 123. And for this, arm 1
23 is rotatable with respect to the pin 134. The E-ring 135 prevents 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, whereby the arm 123 is urged in the clockwise direction and the arrow C direction about the pin 134. There is. The slider 122 is further provided with bending projection pieces 122h and 122i, which prevent the arm 123 from rotating by the tension spring 136, and the bending projection piece 122i prevents the arm 123 from coming off. is doing. As shown in FIG. 6, the tip portion 123c of the arm 123 can come into contact with the sawtooth gear portion 117a provided on the gear 117. In addition, the boss 1 is attached to the arm 123 such that the boss 1 can come into contact with the tip portion 124a of the arm 124.
23d is provided.

The arm 124 is biased in the clockwise direction by a tension spring 137 (FIG. 6) hung between the spring hook 124b and the substrate 1, and in the state shown in the drawing, the protrusion 124c has the elongated hole 122j of the slider 122. Slider 120 protruding from
Engaging the bent portion 120i (FIG. 8) of the arm 124,
The slider 122 is fixed to the slider 120. Further, a pin 124d is erected on the arm 124, and the pin 124d is provided in the elongated hole 122j of the slider 122.
It protrudes so as to be able to contact the cam portion 121j (FIG. 9) of the slider 121.

In FIG. 6, the arm 125 sets the fast-forwarding, rewinding, and slack eliminating modes, and is rotatably attached to the shaft 138 erected on the substrate 1, and has a pin 125a at one end and a pin 125a at the other end. Also, pins 125b are attached to each. A part of the slider 121 is bent and the pin 125a is slidably fitted in the long hole 121b.

The reel base driving device is controlled by the above mechanism. Next, a block for this control will be described with reference to FIGS. 2 and 6.

First, the main brake control block that controls the main brakes 32 and 33 in FIG. 2 will be described.

The main brakes 32, 33 are rotatably attached to the shafts 103, 104 erected on the substrate 1 at positions symmetrical to the straight bisector between the centers of the reel stand devices 2, 3. Further, the 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, whereby the main brake 32 is counterclockwise so as to come into contact with the reel base device 2. The main brake 33 is biased clockwise so as to come into contact with the reel base device 3.

These main brakes 32 and 33 are the main brake control arm 1
Controlled by 05. This main brake control arm 1
Reference numeral 05 is rotatably attached to a shaft 106 that is erected on the substrate 1, and a bent portion 105b (FIG. 6) is provided at one end thereof.
Is provided, and the pin 105a is planted at the other end. In FIG. 6, the bent portion 105b is fitted in the elongated hole 120d of the slider 120 and the elongated hole 121d of the slider 121, and can be brought into contact with the cam portion 122f of the slider 122. The pin 105a is in contact with the protrusion 32b of the main brake 32 and the protrusion 33b of the main brake 33.

Here, the bent portion 105b of the main brake control arm 105
Is a portion other than the concave portion 120h of the elongated hole 120d of the slider 120 (FIG. 8), a portion other than the concave portion 121g of the elongated hole 121d of the slider 121 (FIG. 9), and a portion other than the cam portion 122f of the concave portion 122d of the slider 122 ( Fig. 10
(A)), the main brake control arm 105 is in a state of being rotated clockwise with respect to the shaft 106, so that the pin 1 of the main brake control arm 105 is
Reference numeral 05a denotes protrusions 32b and 33b of the main brakes 32 and 33.
Are pressing. Therefore, the main brakes 32 and 33 are both separated from the reel stand devices 2 and 3, and they are released.

Conversely, when the bent portion 105b of the main brake control arm 105 is 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 is Main brake 32 by 105a,
The pressing by 33 is released, and the tension springs 102 bring the main brakes 32, 33 into contact with the reel stand devices 2, 3, respectively. As a result, the reel base devices 2 and 3 are braked.

Next, the fast forward / rewind (FR) control block F in FIG.
The RB will be described.

This is composed of two arms 59 and 60 that are rotatably attached to a shaft 128 that is erected on the substrate 1. First
In more detail with reference to FIG. 1, the arms 59 and 60 are provided with hook portions 59c and 60b, respectively.
The respective end portions of the armature 9 are hooked, and the protrusion 60a that is set up at the tip of the arm 60 is engaged with the step portion 59a provided on the arm 59. The winding spring 139 causes the arm 60 to move clockwise with respect to the shaft 128 and
The arm 59 is biased in the counterclockwise direction, but since the protrusion 60a is engaged with the stepped portion 59a, the rotation of the arm 59 and the arm 59 is prevented, whereby the arms 59 and 60 are integrated. .

A pin 59b is further erected on the arm 59, and this pin 59b is shown in FIG.
20e (FIG. 8) and the elongated hole 121e of the slider 121.
It penetrates (FIG. 9) and is positioned with respect to the step 122e of the slider 122.

At the other end of the arm 60, a shaft 47 shown in FIGS. 1 and 16 is planted, and a gear 46 is rotatably attached to the shaft 47. Pin 59b is slider 121
When the arm 59 rotates counterclockwise in FIG. 6 by engaging the convex portion 121i of the elongated hole 121e and the step portion 122e (FIG. 10A) of the slider 122, the arm 60 is rotated.
The winding spring 139 also rotates counterclockwise with respect to the shaft 128 (in FIG. 6), which results in the first
As described in the figure, the gear 46 meshes with the gear 45 of the flywheel 42, and fast forward and rewind are performed. At this time, the belt 49 (FIG. 1) is pulled, and the protrusion 60a of the arm 60 is separated from the step 59a of the arm 59.
The pin 59a is the protrusion 12 of the elongated hole 121e of the slider 121.
1i (FIG. 9) and the step portion 122e (first portion) of the slider 122.
0 (A)), the gear 46 is separated from the gear 45 of the flywheel 42 by the pulled belt 49 in FIGS. 1 and 16, and The arms 59 and 60 rotate clockwise around the shaft 128. As a result, the fast forward / rewind mode is released.

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

First, when the tape cassette 34 is mounted (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 the arrow B '(with respect to the slider 120, it is in the eject state that the slider 120 moves to the limit), and the slider 12
1 is in a state of moving to the limit in the direction of arrow B. At this time, the pin 59b erected on the arm 59 of the FR control block FRB abuts on the convex portion 121i provided on the side portion of the elongated hole 121e of the slider 121, and for this reason, the arm 59.
The arm 60, which is integrally formed with the winding spring 139 (FIG. 11), is rotated counterclockwise with respect to the shaft 128. In this state, in FIG. 1, the gear 46 provided on the shaft 47 meshes with the gear 45 of the flywheel 42.

In addition, the recess 120h of the elongated hole 120d of the slider 120
(FIG. 8) and the recess 12 of the elongated hole 121d of the slider 121.
It does not overlap with 1g (Fig. 9) and for this reason,
The bent portion 105b of the main brake control arm 105 has a recess 120h (FIG. 8) in the elongated hole 120d of the slider 120.
The slot 121 of the slider 121.
In d, the main brake control arm 105 is in contact with the bending portion 121h '(Fig. 9), so that
Is in a clockwise rotated state. Therefore, the second
In the figure, the pin 105a that is erected on the main brake control arm 105 indicates the protrusions 32b and 3 of the main brakes 32 and 33.
The main brake 32 is rotated clockwise with respect to the shaft 103 and the main brake 33 is rotated counterclockwise with respect to the shaft 104 against the biasing force of the tension spring 102. Therefore, the reel base devices 2 and 3 are not braked.

Further, the bent portion 120i (FIG. 8) provided on the side of the elongated hole 120g of the slider 120 penetrates the slider 122 sandwiching the slider 121 together with the slider 120 to the side of the arm 124 provided on the slider 122. Although protruding, the protruding portion 12 provided on the arm 124
4c (Fig. 10 (A)) is not engaged. For this,
The urging force of the tension spring 137 causes the arm 124 to rotate in the clockwise direction with respect to the pin 133 erected on the slider 122.
i is connected to the stopper to prevent the rotation, and in addition to this, the urging force of the tension spring 137 applies a force to the arm 124 in the direction of the arrow B, which causes the arm 124 and the arm 123 to move together. Mounted slider 122
Has moved to the limit in the direction of arrow B. This limit is a state in which the end of the elongated hole 122a (FIG. 10 (A)) of the slider 122 is in contact with the shaft 131.

When the slider 122 is in such a position, the arm 1
The tip portion 123c of 23 is the sawtooth gear portion 11 of the gear 117.
7a, and the step portion 1 of the slider 122
22e (FIG. 10 (A)) is separated from the pin 59b set up on the arm 59 of the FR control block FRB, and further, the cam portion 122f of this slider 122 (see FIG. 10).
(A)) is also the bent portion 105b of the main brake control arm 105.
Away from.

Furthermore, the pin 125a erected on the arm 125 is at the end of the linear portion of the elongated hole 121b of the slider 121,
For this purpose, the opening 79a of the FR arm 79 (Fig. 4)
The pin 125b of the arm 125 located inside the opening 79
It is out of the groove 79b (Fig. 4) of a. Therefore, in FIGS. 1 and 4, the FR arm 79 is in a rotatable state with respect to the shaft 71.

Furthermore, pins 141a, 1 are attached to the arm 141 rotatably attached to the shaft 140 set up on the substrate 1.
41 b is provided, and the pin 141 a of these is fitted in the elongated hole 121 e (FIG. 9) of the slider 121, and the pin 121 a is It is in a state of being fitted to the narrow portion at the tip of the elongated hole 121e. As a result, the arm 141 is regulated in a state of rotating clockwise with respect to the shaft 140. In this state, this arm 1
The pin 141b of 41 is capable of contacting the FR arm 79, which prohibits further clockwise rotation of the shaft 71 of the FR arm 79 from the state shown in FIG. For this purpose, FR idler gear 8
In FIG. 2, 2 can mesh with the reel base device 2 on the supply side, but cannot engage with the reel base device 3.

In such a state, as shown in FIG. 15, the tape cassette 34 containing the magnetic tape 40 indicated by the alternate long and short dash line
When is installed, loading starts automatically.

At this time, the pin 59b erected on the arm 59 of the FR control block FRB is still in the elongated hole 121 of the slider 121.
Since it is in contact with the convex portion 121i of FIG.
2 and 2, the gear 4 of the flywheel 42 is shown.
5 and the gear 46 mesh with each other, and at this time, the capstan motor 5 rotates and the FR idler gear 86 in FIG. 4 rotates clockwise. As a result, the FR arm 79 rotatably provided on the shaft 71 also tries to rotate clockwise, but the pin 141b of the arm 141 is rotated.
The FR idler gear 82 does not mesh with the reel base device 3 in FIG. 2 because (FIG. 6) prohibits it. That is, the FR idler gear 82 is prevented from meshing with the reel base device 2 due to the rotation of the capstan motor 5, and the pin 141b of the arm 141 (6th
(Fig.) Prevents the reel base device 3 from meshing. At this time, the tape cassette 34 to the magnetic tape 4
0 (Fig. 15) is pulled out, but FR idler gear 8
Since 2 does not engage with any of the reel stand devices 2 and 3, the magnetic tape 40 is not unduly loaded.

When the magnetic tape 40 is shown by the solid line in FIG. 15 and the loading operation is completed, 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. 6, the pin 59b erected on the arm 59 of the FR control block FRB is out of alignment with the projection 121i (FIG. 9) provided in the elongated hole 121e of the slider 121. When the pin 59b is in contact with the convex portion 121i, as described above, in FIG. 1, the gear 45 of the flywheel 42 and the gear 46 provided on the shaft 47 mesh with each other. When the belt 49
Is tensioned between the pulleys 51 and 63 by the urging force of the winding spring 139 (FIG. 11) between the arms 59 and 60. Therefore, as described above, when the pin 59b is disengaged from the convex portion 121i, the biasing force of the spring 139 is weakened.
By the tension of 9 (Fig. 1), the arm 60 also shifts to the shaft 12
Rotate clockwise with respect to 8. Therefore, in FIG. 1, the gear 46 provided on the shaft 47 is separated from the gear 45 of the flywheel 42.

Further, 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 each other, and these are the bent portions of the main brake control arm 105. It faces 105b. Therefore, in FIG. 2, the protrusion 32 of the main brakes 32, 33 by the main brake control arm 105 is shown in FIG.
The pressing force on b and 33b is released, and the main brake 32
Rotates counterclockwise with respect to the shaft 103, and the main brake 33 rotates clockwise with respect to the shaft 104 to brake the reel base devices 2 and 3. Along with this, the main brake control arm 105 is
In the figure, the shaft 106 rotates counterclockwise until it comes into contact with the recess 121g in the elongated hole 121d of the slider 121.

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

Further, since the slider 121 has moved in the direction of the arrow B ′ as described above, the pin 12 that has been planted on the arm 125 is
5a relatively moves along the straight line portion of the elongated hole 121b of the slider 121, but immediately before the bent portion 5a.
The arm 125 does not rotate with respect to the shaft 138 due to the movement of the slider 121.

By the movement of the slider 121 in the direction of the arrow B ', the pin 141a of the arm 141 is released from the tip small hole portion (Fig. 9) of the elongated hole 121e of the slider 121, so that the arm 141 does not move with respect to the shaft 140. It can be rotated clockwise.

Further, when the mode switching gear 55 rotates due to the rotation of the pulley 52 of the loading motor 6, the slider 120
Moves further in the direction of arrow B, and the bent portion 120i 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. Further, since the arm 123 is mounted on the slider 122, these sliders 120, 122 and The arms 123 and 124 are integrated.

This state is the loading stop state (hereinafter L ・ ST
FIG. 12 shows the state of the main part of the control means in this L-STOP mode.

Next, the operation of the main part of the control means at the time of shifting from the L / STOP mode to the mode for performing fast forward / rewind in the loading state, that is, the loading fast forward / rewind mode (hereinafter referred to as L / FR mode). The 12th
This will be described with reference to FIGS. Note that FIG. 13 shows the state of the main part of the control means in the L / FR mode.

The transition from the L / STOP mode to the L / FR mode is performed by the pulley 52 of the loading motor 6 in the state shown in FIG.
Rotates counterclockwise in FIG. As a result, the 12th
In the figure, the gear 117 rotates in the direction of the arrow D ', and the mode switching gear 55 (Fig. 6) allows the slider 1 to move.
20 moves in the direction of arrow B '. At this time, the slider 1
The bent portion 120i of 20 is the protruding portion 124c of the arm 124.
Since the slider 120 and the arm 124 are integrated with each other, the slider 120 and the arm 124 are integrated with each other.
24 moves in the direction of arrow B '. Along with this, the slider 122 and the arm 123 also move in the arrow B'direction.

The movement of the slider 122 causes the main brake control arm 1 to move.
The bent portion 105b of the slider 05 is the cam portion 122 of the slider 122.
The contact position moves from f to the concave portion 122d, whereby the main brake control arm 105 pivots clockwise with respect to the shaft 106, and the main brakes 32 and 33 are separated from the reel stand devices 2 and 3 by the second position. It will be in the state shown in the figure.

Further, by moving the slider 122 in the direction of the arrow B ′, F
Pin 59 set up on arm 59 of R control block FRB
b contacts the step 122e of the slider 122, which causes the arm 59 to rotate clockwise with respect to the shaft 128. When the arm 59 is thus rotated, the arm spring 60 is also rotated clockwise by the winding spring 139 (Fig. 11), which causes the gear 45 and the shaft 47 of the flywheel 42 to move in the direction shown in Fig. 1. It meshes with the provided gear 46.

This is the state shown in Fig. 13, which is L ・ FR.
The mode has been set.

In FIG. 12, when the slider 122 moves in the direction of arrow B ′, the arm 123 also moves in the direction of arrow B ′ and its tip portion 123c abuts on the sawtooth gear portion 117a of the gear 117. Since 117 rotates in the direction of the arrow D ', the arm 123 is also urged clockwise with respect to the pin 134 by the tension spring 136, so that the tip 123c of the arm 123 has a gear 117.
Along with the rotation of the saw tooth gear 117a,
As a result, the arm 123 only vibrates and rotates with respect to the pin 134.

Next, the quick brake mode when shifting from the L / FR mode to the L / STOP mode will be described with reference to FIGS. 12 and 13.

In the state shown in FIG. 13, when the pulley 52 of the loading motor 6 rotates in the clockwise direction in FIG. 6, the mode switching gear 55 rotates in the counterclockwise direction in FIG. Rotate in the direction of arrow D. As a result, the saw-toothed gear portion 117a of the gear 117 is connected to the arm 123.
The arm 123 is pushed in the direction of arrow C ′ against the biasing force of the tension spring 136. To this end, the arm 123 is guided by the pin 134 that is fitted in the elongated hole 123a of the arm 123 and is set up on the slider 122 and the bent projection pieces 122h and 122i provided on the slider 122, and the arm 123 is indicated by an arrow C '. Move in the direction.

When the arm 123 moves in the direction of the arrow C ′, the boss 123 d provided on the arm 123 presses the tip portion 124 a of the arm 124, whereby the arm 124 resists the urging force of the tension spring 137, and Rotate counterclockwise with respect to 133. Along with this, the slider 12
Bent portion 120i (FIG. 8) and arm 12
4 is released from the engagement with the protrusion 124c, and the arm 124 is released from the slider 120.

Therefore, as shown in FIG. 12, the urging force of the tension spring 137 acts on the arm 124, and the arm 124 moves together with the slider 122 and the arm 123 until the end of the elongated hole 122a of the slider 122 contacts the shaft 131.
Move in the direction of arrow B. By this movement of the slider 122, the step portion 122e of the slider 122 is separated from the pin 59b which is set up on the arm 59 of the FR control block FRB, and the arm 59 is released from the restraint by the step 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 by the urging force of the winding spring 139 (FIG. 11). The arm 60 is rotated to the limit with respect to the shaft 128, and the belt 49 is stretched in FIG.

However, when the arm 59 is released from the restraint by the step portion 122e, the arm 59 is rotated counterclockwise (clockwise in FIG. 12) with respect to the shaft 128 by the biasing force of the winding spring 139 in FIG. Since the arm 60 is moved, the arm 60 is released from being restrained by the urging force of the winding spring 139, so that the tension of the belt 49 (FIG. 1) causes the arm 60 to rotate counterclockwise in the same direction as the arm 59. As a result, the gear 46 in FIG. 1 is separated from the gear 45 of the flywheel 42, and the drive of the reel stand device 2 or 3 via the belt 49 is stopped.

Further, since the slider 122 moves in the direction of the arrow B, the bending portion 1 provided on the main brake control arm 105 is
05b is released from the concave portion 122d of the slider 122 and is in a state of facing the cam portion 122f. For this reason, in FIG. 2, the protrusions 32b of the main brakes 32, 33,
The pressing force of the main brake control arm 105 applied to 33b disappears, and the biasing force of the tension spring 102 causes the main brake 32 to rotate counterclockwise with respect to the shaft 103 and the main brake 33 to rotate clockwise with respect to the shaft 104, respectively. Brakes are applied to the stand devices 2 and 3, respectively.
At this time, while the main brakes 32 and 33 rotate as described above, as shown in FIG. 12, the main brake control arm 105 moves with respect to the shaft 106 until the bent portion 105b contacts the cam portion 122f of the slider 122. Rotate counterclockwise.

Further, the arm 123 also moves in the direction of the arrow B, and the tip portion 123c thereof is disengaged from the serrated gear portion 117a of the gear 117. Therefore, the arm 123 moves in the direction of arrow C while being guided by the pin 134 and the like as described above by the biasing force of the tension spring 136. Therefore, the arm 124
The tip portion 124a of the arm 124 is released from the pressing force of the boss 123d of the arm 123, and thus the arm 124 is rotated clockwise by the urging force of the tension spring 137.

On the other hand, the slider 12 is rotated by the rotation of the mode switching gear 55.
0 also moves in the direction of arrow B, and the bent portion 120i (8th
(See figure) stops at a position facing the protrusion 124d of the arm 124. Therefore, by the clockwise rotation of the arm 124 by the urging force of the tension spring 137, the bent portion 120i and the protruding portion 124c are engaged with each other, and the arm 124 and the slider 120 are united as they are. . The engagement between the bent portion 120i and the protruding portion 124c is held by the biasing force of the tension spring 137.

As described above, the gear 45 of the flywheel 42,
The pulley 63 and the gear 46 (FIGS. 1 and 2) that rotates together with the pulley 63 are separated from each other, and the transmission of the rotation to the reel stand devices 2 and 3 via this is released, and the main brake control arm 105 is used. The pressure is released and the main brakes 32, 3
3 is crimped onto the brake crimping outer peripheral portion 93 (FIG. 1) of the reel stand 89 of the reel stand apparatuses 2 and 3 (FIG. 2), and the reel stand apparatuses 2 and 3 are braked.

In this way, when shifting from the L / STOP mode to the L / FR mode, the gear 45 meshes with the gear 45 of the flywheel 42 in FIG. 1, and the FR idler gear 82 to the reel stand device via this gear 46. The rotation of the capstan motor 5 is directly transmitted to the two (or three) reel bases 89, and the pressure contact of the main brake 32 (and 33) to the brake pressure contact outer peripheral portion 93 of the reel base 89 is released. Fast forward or rewind operation is performed.

On the other hand, when shifting from the L / FR mode to the L / STOP mode, the gear 45 disengages from the gear 45 of the flywheel 42, the rotation transmission to the reel base 89 is lost, and the brake press-bonding outer peripheral portion 93 is provided. The main brakes 32 (and 33) are pressure-bonded, and the reel stand devices 2 and 3
Brakes.

When shifting from the L / STOP mode to the L / FR mode, the arm 123 moves from the state shown in FIG. 12 in the direction of the arrow B'and its tip portion 123c abuts on the serrated gear portion 117a of the gear 117. As described above, since the gear 117 rotates in the D ′ direction and the arm 123 only vibrates around the pin 134, the arm 1
24 does not rotate and is held in a state of being integrated with the slider 120. As a result, the L ・ STOP mode changes to the L ・
When shifting to the FR mode, the tip portion 1 of the arm 123 is
Even if 23c abuts on the serrated gear portion 117a of the gear 117, the arm 122 is not affected by this and the arm 122 moves to the slider 120.
Move in the direction of arrow B'together with the
The brakes of the reel base devices 2, 3 by the brake levers 2, 33 are released, and the rotation of the capstan motor 5 is transmitted to the reel base devices 2, 3 to set the L / FR mode.

Since the brake is applied by the movement of the slider 122,
This braking is applied rapidly, and after the start and end of the magnetic tape 40 in the fast-forward and rewind modes are detected, the reel base units 2 and 3 are quickly braked.

Next, setting of recording, reproduction and search modes will be described. These modes shift from the L-STOP mode shown in FIG.

In FIG. 12, the slider 121 is rotated by the rotation of the mode switching gear 55 (FIG. 6) by the loading motor 6.
Moves further in the B'direction. As a result, the slider 1
The bent portion 105b of the main brake control arm 105, which is located in the concave portion 121g of the elongated hole 121d of 21, is the elongated hole 121d.
To the bent portion 121h of the arm (above, FIG. 9), the arm 1
05 rotates clockwise with respect to the shaft 106. As a result, the main brakes 32, 33 are connected to the reel stand devices 2, 3
And the brakes for each are released. Also,
Since the slider 120 does not move, the FR control block F
The pin 59b set up on the arm 59 of the RB is the slider 12
2 is separated from the stepped portion 122e, so that the arms 59 and 60 are rotated clockwise with respect to the shaft 128, and the gears 45 and 46 of the flywheel 42 (see FIG. 1) mesh with each other. It is still released.

On the other hand, since the slider 121 has moved in the direction of arrow B'from the state shown in FIG.
The pin 125a of the arm 125, which is attached to the linear portion (FIG. 9) of 21b, enters the bent portion of the slot 121b, whereby the arm 125 rotates counterclockwise with respect to the shaft 138.

Therefore, the pin 125b planted on the arm 125 is
The FR arm 79 is fixed by engaging with the groove 79b of the arm 79. In this state, in FIGS. 1 and 4,
FR mounted on FR arm 79 via shaft 80
The 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 devices 2 and 3 shown in FIG.
The idler gear 82 is a position where it does not mesh with the FR gear of any reel base 89 of the reel base devices 2 and 3.

Therefore, the rotation of the capstan motor 5 is as shown in FIG. 1 by the flywheel 42 → pulley 42a → belt 4
8 → pulley 50 → idler gears 70, 76, 75 → winding gear 99 → reel base 8 only through the clutch plate 101
9 is transmitted. As a result, the recording, reproduction 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 the recording / playback or search mode is shifted to the L / STOP mode, the rotating direction of the loading motor 6 is reversed, and the slider moves in the direction of arrow B to reach the state shown in FIG.

Next, when shifting from the L.STOP mode shown in FIG. 12 to the eject mode, the gear 117 rotates in the direction of the arrow D ', the mode switching gear 55 also rotates, and the slider 1
20 moves in the direction of the arrow B ', and along with this, the slider 1
The arm 22 and the arms 123 and 124 are also integrally moved in the direction of arrow B'to enter the L / FR mode state shown in FIG. 13, but the slider 121 is moved to the arrow B by further rotation of the mode switching gear 55. Move in the direction. As a result, the cam 121j (see FIG. 9) of the slider 121 abuts against and pushes the pin 124d provided on the arm 124, and for this reason, the arm 1
24 rotates counterclockwise with respect to the pin 133.

By the rotation of the arm 124, 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 is released.
By the urging force of 37, the arm 124 moves together with the slider 122 and the arm 123 in the direction of arrow B until the state shown in FIG. 6 is reached.

On the other hand, in FIG. 13, as described above, the slider 12
1 moves in the direction of arrow B and the slider 122 moves in the direction of arrow B, so that the pin 59b erected on the arm 59 of the FR control block FRB is disengaged from the step 122e of the slider 122. 12
1 is in contact with the convex portion 121i (FIG. 9) of the elongated hole 121e, and therefore the arms 59 and 60 are rotated counterclockwise with respect to the shaft 128 as described above. . Therefore, in FIGS. 1 and 2, the gear 45 is in mesh with the gear 45 of the flywheel 42.

In addition, the bending portion 10 of the main brake control arm base device 105
5b is separated from the cam portion 122f of the slider 122 and the bent portion 12 of the elongated hole 121d of the slider 121 is provided.
1h '(Fig. 9), the main brake control arm 10
5 is held in a state of being rotated clockwise with respect to the shaft 106. For this reason, in FIG. 2, the main brakes 32, 33 have their protrusions 32b, 33b pressed by the main brake control arm 105,
The brake is not applied to the reel stand devices 2 and 3 as shown in the figure.

Although the unloading operation starts in this state, the capstan motor 5 also rotates at a predetermined speed, and the FR idler gear 86 rotates counterclockwise. For this reason, the FR arm 79 (FIG. 4) rotates counterclockwise and the FR idler gear 82 meshes with the reel base device 2 on the supply side. The rotation of the FR idler gear 86 is the rotation of the FR idler gear 8
The magnetic tape 40 is transmitted to the reel base unit 2 via the reel 2, and the slack of the magnetic tape 40 during the unloading operation is wound up on the reel base unit 2 side.

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

As described above, the rotation is transmitted to the reel stand device through different rotation transmission systems in the modes such as recording, reproduction, and search, and the slack removal of the magnetic tape during fast-forwarding, rewinding, and unloading. Yes, the belt torque for each can be set independently of each other. In this case, fast forward,
Since the rotation transmission system for rewinding and slackening is operated only in these modes, power consumption can be greatly reduced.

Further, since the rotating body is coaxially provided between these two rotation transmission systems, the planar space can be reduced and the VT can be reduced.
The size of R can be reduced, and since the number of holes in the substrate can be reduced, the mechanical strength of the substrate also increases.

Further, as for the control of the main brake, as is apparent from the operation of the control means, when the fast forward or rewind mode is changed to the loading top mode, the slider 12 is used.
2 (FIG. 6).

The control of the main brake in the conventional VTR is, for example,
As disclosed in JP-A-58-147835,
If plungeer does not, cost, weight,
Although it is improved in terms of space, operation noise, etc., since the control of the main brake is also performed in association with the rotation operation of the mode switching gear, there is a problem in the operating speed of the main brake. Especially, a small V called 8mm video
In the TR, in the L / FR mode, the tape leader part at the end of the magnetic tape is optically detected to make the L / ST
When switching to the OP mode, the length of this tape leader is relatively short. For this reason, unless the time from the detection of the tape leader portion to the stop of the magnetic tape is made as short as possible, the magnetic tape is completely wound up and pulled between both tape reels, and the magnetic tape becomes excessive. Tension will be applied. Therefore, not only the end of the magnetic tape is damaged, but also the magnetic head attached to the rotary cylinder is damaged by being shocked.

On the other hand, in the control means of the present invention, the braking is applied quickly as described above, and the above problems do not occur.

〔The invention's effect〕

As described above, according to the present invention, since the rotation transmission system to the reel base device is two different systems, one of the rotation transmission systems is for a mode requiring a strong torque such as fast-forwarding and rewinding. The other can be used as a rotation transmission system for a mode requiring a weak torque such as recording and reproduction, and the belt tension can be set according to each torque to reduce power consumption. Since the rotation transmission system is arranged coaxially, it is possible to reduce a planar space, solve the problems of the above-mentioned conventional techniques, and provide a reel stand drive device having an excellent function. .

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a reel stand driving device according to the present invention, FIG. 2 is a plan view thereof, and FIGS. 3 and 4 are plan views showing an idler portion in FIG. 1 and FIG. 4 is a side view of the idler portion shown in FIG. 4, FIG. 6 is a plan view showing one specific example of the control means of the embodiment shown in FIG. 1, and FIG. 7 is one specific example of the mode switching gear of FIG. An example plan view, FIG. 8 is a plan view showing the first slider of FIG. 6, FIG. 9 is a plan view showing the second slider of FIG. 6, FIG. 10 (A),
(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 in FIG. 6, FIG. 12 and FIG. 1
FIG. 3 is an operation explanatory view of a main part of the control means shown in FIG. 6, FIG. 14 is a plan view showing a mechanical system provided on the front surface side of the substrate of the video tape recorder, and FIG. 15 is a video tape recorder. FIG. 16 is a plan view showing a state of the mechanical system when the tape cassette is mounted, and FIG. 16 is a plan view showing a mechanism provided on the back surface side of the substrate with respect to FIG. 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 ... Belt, 50, 51 ... Pulley, 55 ...
... Mode switching gear, 63 ... Pulley, 69 ... Shft, 70 ... Idler gear, 71 ... Shft, 72 ...
... Arm, 74 ... Shaft, 75, 76 ... Idler gear, 79 ... FR arm, 80 ... Shaft, 81 ...
... felt, 86 ... FR idler gear, 89 ... reel stand, 92 ... FR gear, 99 ... take-up gear, 100
…… Felt, 101 …… Clutch board.

Continuation of the front page (56) References JP-A-60-103544 (JP, A) JP-A-57-141058 (JP, A) Actually opened 61-003838 (JP, U)

Claims (2)

[Claims] 1. A first and a second rotating body rotatably provided on a shaft provided on a vertical bisector of a line connecting the centers of a pair of reel stand devices, and rotatable about the shaft. The first and second arms provided, the third rotatably rotatably provided on the first arm and rotated by the rotation of the first rotator, and the third arm rotatably on the second arm. A rotatably provided fourth rotating body that rotates by the rotation of the second rotating body, and first and second transmitting a rotation of a forward and reverse rotatable motor to the first and second rotating bodies Rotation transmitting means for directly transmitting the rotation of the motor from the third rotating body to any one of the reel stands of the reel stand apparatus, and the torque limiter of the reel stand apparatus from the fourth rotating body. A reel base drive device, wherein the rotation of the motor can be transmitted to the reel base via the reel base. 2. The method according to claim 1, wherein
Is a swinging arm that rotates in a direction corresponding to the rotation direction of the motor.