JPS58147835A - Magnetic tape device - Google Patents

Abstract

PURPOSE:To obtain braking operation close to that of a plunger driving system during transition from the fast winding mode to the stop mode of a video tape recorder equipped with a mechanism which changes operation modes by utilizing the rotation of a motor, by moving a braking control member between a nonoperation and an operation position and controlling the braking operation. CONSTITUTION:In fast traversing mode, when a transparent tape is detected optically and a tape end detection signal is sent out, the motor rotates a driving gear 160 clockwise, so the 1st body 142 of rotation rotates counterclockwise and the 2nd body 162 of rotation rotates clockwise. At this time, a gear part 170 is engaged with the pawl part 154 of a pawl lever 152, so the gear part 170 presses the pawl part 154 as shown by an arrow A. Then, the braking control member 130 rotates counterclockwise on a guide shaft 132 eventually to disengage an engaged part 148 from a pawl part 150, so the braking control member 130 is energized by a tension spring 136 to return to a stop mode instantaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a magnetic tape device such as a video tape recorder having a mechanism for switching operating modes using rotation of a motor.

Generally, there are two well-known methods for switching the operating mode of a magnetic tape device: one using manual operation and the other using a plunger. However, those that are manually operated have problems such as poor operability and cannot be controlled remotely, and those that use a plunger have problems such as increased cost, weight, and loud operation noise.

In recent years, in order to solve this problem, a system has been introduced in which the operating mode is switched by the rotation of the motor (for example, Japanese Patent Application No. 16263/1983), but this system still has major problems. has been done.

For example, in a general mechanism where the motor rotates in one direction to switch from a stop mode to a fast-winding mode that rapidly feeds the tape, and when the motor rotates in the opposite direction it switches from a fast-winding mode to a stop mode, in order to obtain sufficient operating force. , the motor rotation is greatly reduced. Therefore, even if the vicinity of the end of the tape is optically detected in the fast winding mode, for example, it takes time for the motor to rotate and change from the fast winding mode to the stop mode, and this causes the tape to reach the end. A major problem was that excessive tension was applied to the tape. Furthermore, although cams are often used to switch the operating mode using this method, the pressure angle of the cam has a limit due to the operating force, making it difficult to obtain sufficient stroke and ensure reliable braking action. In order to achieve this goal, it became necessary to strictly control the accuracy of individual parts. In addition, as a trend in recent years, magnetic tape devices have come to be required to have a variety of functions. Therefore, it was difficult to control the brake operation accurately.

The present invention can solve nine or more problems, and although it is a motor-driven system, it performs a braking operation different from that of a plunger-driven method when moving from a fast winding mode to a stop mode, and also uses other modes. The purpose of the present invention is to provide a magnetic tape device that can reliably control braking operation even when moving to.

Hereinafter, the present invention will be explained based on illustrated embodiments.

FIG. 1 shows a top view of this embodiment. In the figure, a take-up reel stand 1o and a supply reel stand 12, which are rotatably loosely fitted to shafts 4 and 6 installed on the upper surface of the substrate 2, are connected to each other when the cassette 20 is installed at a predetermined location on the main body of the apparatus. The take-up reel hub 14 in the reel 20 and the supply reel hub 16 are respectively engaged and can be rotated together by claws 8 provided on both reel stands 10 and 12.

FIG. 2 shows a cross-sectional view of the reel stand drive system. Each supply reel stand 12 has a reel gear 30.
40, and the reel gear 30° and 40 mesh with a take-up reel idler gear unit 62° and a supply reel idler gear unit 62, which are rotatably loosely fitted to a shaft 50 and 60 set up on the substrate 2, respectively, and are driven to rotate. be done. The take-up reel idler gear unit 62 and the supply reel idler gear unit 62 include a take-up reel idler gear 54a and a supply reel idler gear 64a, respectively, as shown in FIG.
The rotation is transmitted to the take-up reel idler gear 64b meshing with the reel gear 30°4o and the supply reel idler gear e4b via a clutch means using a friction member such as FEL56.66. .

On the other hand, the capstan 72, which is rotatably supported by a bearing member 7o fixed to the substrate 2, has a rotating roller part 74 in a part thereof, and is pressed against the rotating row 2 part 74 by applying a predetermined pressing force. The main idler 76 transmits its rotation.
The relay row 28 is rotatably loosely fitted to the shaft 80 installed in the
A belt 84 is stretched between the rollers 2 and 2, and its rotation is transmitted to the relay roller 82. A rotating arm 88 having a rotatable idler gear 86 supported at one end is loosely fitted to the shaft 8o, and a multi-pole magnet eO is integrally attached to the shaft 80 so as to be substantially concentric with the shaft 80. Further, a magnet 90 is placed on the inner circumference of the relay roller 82.
A magnetic material 92 having a magnetic hysteresis characteristic is fixed to face the magnet 90 with a predetermined clearance, and generates a predetermined attractive force between the magnet 90 and the relay roller 82 to rotate in the same direction as the rotation direction of the relay roller 82. A force is applied to the pivot arm 88. Further, the idler gear 86 is configured to constantly mesh with a gear portion 94 provided on the relay roller 82, and depending on the operation mode of the device, the take-up reel idler gear 64a or the supply reel idler gear 64a is rotated by the rotation of the relay roller 82. The winding IJ rotates 20 times according to the direction of the rotational force.
- selectively transmitted to the supply reel stand 10 or the supply reel stand 12.

In addition, in FIG. 1, a lever 98 rotatably fitted loosely onto a shaft 96 set on the base plate 2 is biased clockwise by a tension spring 1oo, and a rotatable idler tire 102 is mounted on one end. The relay lever 1o4 is rotatably supported by a shaft 106. The shaft 106 extends to the back surface of the substrate 2 and is configured to come into contact with a brake control member, which will be described later, and furthermore, when the device is stopped, the shaft 106 is connected to a take-up reel idler gear 52 and a supply reel idler gear 62. Guide them so that they are at approximately the same distance from (
(not shown) is provided. Further, as is well known, the rotation of the idler tire 102 is such that a braking force is applied, so when a brake control member, which will be described later, moves and the abutment of the shaft 106 is released, the rotation of the lever 98 causes the idler tire 102 to rotate.
2 comes into contact with the back surface of the belt 84 shown in FIG. 2, and the take-up reel idler gear s4
The rotation of the capstan 72 is selectively directed to the take-up reel stand 1o or the supply reel stand 12 by entering between the pulley part 69 provided integrally with the supply reel idler gear 64b or the pulley part 69 provided integrally with the supply reel idler gear 64b. , and enters fast forward mode or rewind mode. At this time, the above-mentioned idler gear 86 is kept at a position where the distance from the take-up reel idler gear 54a and the supply reel idler gear 64a is approximately equal by a regulating member (not shown) despite the rotation of the relay roller 82. This is so that it does not rotate to either of the two reel stands 10 degrees 12.

The shafts 110 and 120 erected on the substrate 2 are each provided with a winding-side brake 112. A supply brake 122 is rotatably fitted into the supply brake 122 and biased clockwise and counterclockwise in FIG. 1 by tension springs 114 and 124, respectively. The brake structure shown in this embodiment is a well-known double-acting brake, and tension springs 116 and 126 adjust the braking force when both brakes 112 and 122 bite into the reel stands 10 and 12. It has become.

Reference numerals 118 and 128 denote kick pins installed toward the back surface of the substrate 2 on the take-up side brake 112 and the supply side brake 122, respectively, and both brakes can be activated by pressing the kick pins 118 and 128 toward the left in FIG. 1
12, 122 are separated from both reel stands 10, 12, and the brake force can be released.

Next, the configuration of the back surface of the substrate 2 will be explained with reference to FIGS. 3 to 7. FIG. 3 shows a stopping state of the device, in which the brake control member 130 takes up the take-up reel shaft 42, which is set up on the base plate 2. 134.

Furthermore, the brake control member 130 is biased toward the left in FIG. It is biased clockwise in FIG. 3 around the horizontal guide shaft 132. At this time, a cam follower 146 installed in the brake control member 130 is installed in a grooved cam 144 with two end faces of the first rotary body 142, which is a gear having a gear on its outer periphery and rotatably loosely fitted on the guide shaft 134. At the same time, the engaging portion 148 provided on the end surface of the first rotating body 142 and the claw portion fixed to the brake control member 130 are in contact with each other, so that the state shown in FIG. 3 is maintained. Reference numeral 152 denotes a lever with a claw that is rotatably fitted loosely onto a shaft 166 mounted on the brake control member 130, and is biased to rotate counterclockwise in FIG.
It comes into contact with a stopper 169 provided at 3o and is restricted from rotating. 160 is a gear portion 14 provided on the first rotating body 142
3 and is a drive gear that rotationally drives the first rotating body 142.

It is rotated by a motor (not shown). Reference numeral 162 denotes a second rotating body, which is a gear loosely fitted in a rotatable manner to a shaft 164 installed on the back surface of the substrate 2, and a grooved cam 166 is provided on the end surface.
is formed, and has a gear portion 170 on its outer periphery, which meshes with the first rotating body 142 .

When the first rotating body 142 rotates clockwise from the state shown in FIG.
The structure is such that the brake control member 130 is moved to the right against a force of 360 degrees.

At this time, a relief part 145 is provided in the grooved cam part 144 to release the cam follower 140 from the grooved cam part 144. At this time, the pawl lever 152 also moves to the right together with the brake control member 130, and the pawl portion 154 engages with the gear portion 170 of the second rotating body 162, resulting in the state shown in FIG. 4. From this state, the first rotating body 142
When rotated counterclockwise in the figure, the gear portion 170 and the claw portion 1
64 engages, and the gear portion 170 presses the pawl portion 154 in the direction of arrow A, so that the brake control member 130
The claw portion 154 rotates about the guide shaft 132 in the direction indicated by the arrow against the rotation urging force of the guide shaft 132 .
distance 11 from the guide shaft 132 to the claw portion 150
The movement of the claw portion 164 is determined by the ratio of the distance 12 to the claw portion 150.
3, the engaging portion 148 and the claw portion 150 are immediately disengaged and returned to the position shown in FIG. 3 by the tension spring 136. Further, since the above-mentioned grooved cam 144 is provided with the relief portion 146, the cam follower 146 does not prevent rotation in the direction of arrow A. Grooved cam 1 provided on the first rotating body 142 in FIG.
As can be seen from the cam diagram of No. 44, when the first rotating body 142 rotates counterclockwise from the stopped state shown in FIG. Move to the right in the same way as clockwise rotation. At this time, the claw portion 164 of the claw lever 152
moves to a position where it can engage with the gear portion 170 of the second rotating body 162, but as shown in FIG.
A flange 168 is provided on the gear portion 170 of 62, and the claw portion 164
and the gear part 170 changes from the stopping state of the first rotating body 142 to the third
In the figure, the structure is such that it does not engage when rotated counterclockwise.

Next, the operation will be explained.

When the fast forward button (not shown) is pressed from the stop state shown in FIG. 3, the capstan 72 rotates clockwise in FIG. 1, so the main idler 76 rotates counterclockwise in FIG. The relay roller 82 also rotates counterclockwise in FIG. A motor (not shown) drives the drive gear 160 into the third position.
Since it rotates counterclockwise in the drawing, the first rotating body 142 rotates clockwise in the drawing. Therefore, the engaging portion 148 and the claw portion 160
is in an engaged relationship and moves to the right in FIG. 3 by an amount determined by the rotation angle of the first rotating body 142. First rotating body 142
When the motor rotates a predetermined amount, a switch (not shown) is turned on and the rotation of the motor is stopped, resulting in the state shown in FIG.

By moving the brake control member 13o, the lever 98k.
Since the contact between the shaft 106 extending on the back surface of the planting board 2 and the brake control member 130 is released, the tension spring 1oO
As a result, the idler tire 102 moves to a position where it comes into contact with the back surface of the belt 84.

On the other hand, since the belt 84 is rotating counterclockwise in FIG. 1, the relay lever 104 rotates clockwise in FIG. The take-up reel stand 10 is rotated clockwise in FIG. 1 at high speed. At the same time, the brake kick portion 172 of the brake control member 130
2, 122 and extending to the back side of the board 2 is pressed and moved to the right in FIG.
The brake force of 0.12 is released and a fast forward mode is entered.

Also, at this time, the claw part 164 of the claw lever 162 comes to a position where it meshes with the gear part 170 of the second rotating body 162, but the rotation direction of the second rotating body 162 is counterclockwise in FIG. is the direction of escape, and no unreasonable force is applied.

Next, from the above-mentioned fast forwarding mode, when the transparent tape is detected optically and an end detection signal is output, the motor starts driving the drive gear 1.
60 in the clockwise direction in FIG. 4, the first rotating body 14
2 rotates counterclockwise in FIG. 4, and the second rotating body 162 rotates clockwise. At this time, the gear part 170 and the pawl lever
162 and the pawls 154 are meshed, so the gear portion 170 presses the pawls 154 in the direction of arrow A, and as a result, the brake control member 130 rotates counterclockwise in FIG. 4 about the guide shaft 132 and engages. Since the engagement between the portion 148 and the claw portion 150 is released, the brake control member 130 instantly returns to the state shown in FIG. 3 due to the biasing force of the tension spring 136. Then, the slope portion 174 presses the shaft 106 and rotates the lever 98 clockwise in FIG. 4, so that the idler tire 102 returns to the state shown in FIG. part 172 and kick pin 11
8 are separated and become the state shown in Fig. 3, both reel stands 1
Braking force is applied instantaneously to 0 and 12.

Further, the first @ rolling body 142 rotates clockwise in FIG. 4, and the engaging portion 148 and the claw portion 150 shown in FIG. Then, a switch (not shown) is turned on, the motor stops, and the capstan also stops. The rewinding operation is almost the same as the fast forwarding operation, except that the rotation direction of the capstan 72 is reversed and the supply reel stand 12 is rotationally driven, so a description thereof will be omitted.

Next, I will explain the reproduction mode. When the regeneration button (not shown) is pressed from the stop mode, the motor rotates the drive gear 160 clockwise in FIG.
Rotate counterclockwise. Since the cam follower 146 moves along the engaged groove cam 144, the brake control member first separates both brakes 112 and 122 from both reel stands 10 and 12, as shown in the cam diagram in FIG. The stroke required for this is to move 3 parts to the right and then rotate, resulting in 6 fin movements in the reproduction mode shown in Figure 6. When the first rotating body 142 rotates a predetermined amount, the switch (
(not shown) enters, the rotation of the motor stops, and the state shown in FIG. 6 is reached. Although a detailed explanation will be omitted, the rotation of the second rotating body 162 accompanying the rotation of the first rotating body 1420 and the moving member 176 (one part) engaged with the grooved cam part 166 provided on the second rotating body 162 As shown in FIG. 1, the magnetic tape 180 stored in the cassette 20 is pulled out until the tape drawer member 182 abuts and is fixed to the fixing member 184, and the rotating head 186. Audio head 188. The predetermined attachment to the tape guide 190 is made, and the pinch roller 192 is pressed against the capstan 72 by a force of λ. Also, since the capstan 72 rotates clockwise in FIG. 1, the main idler 76 Figure 1 Rotates counterclockwise,
The belt 84 and relay roller 82 also rotate counterclockwise. The idler gear 86 rotates clockwise due to the counterclockwise rotation of the relay roller 82, and an automatic counterclockwise force is applied to the rotating arm 88 around the shaft 8o, so that the idler gear 86 meshes with the take-up idler gear 54a. death,
The take-up reel stand 1o is rotated clockwise in FIG. 1 to wind up the magnetic tape 180, which is fed at a constant speed by the cooperation of the capstan 72 and the pinch roller 192. At this time, the shaft 106 of the idler tire 102 is pressed by the moving member 176 shown by the dashed line in FIG. 6, so that the idler tire 102 is in contact with the take-up reel idler gear 54b and the supply reel idler gear, as shown in FIG.

Magnetic tape 1 by the above-mentioned tape pull-out member 182
80, the brake control member 130 is moved to the right by the counterclockwise rotation of the first rotating body 1420.
Since it is set after the movement of m+, both reel stands 10,
12 has been released, and the magnetic tape 18
The magnetic tape 180 will not be damaged due to excessive tension being applied to the magnetic tape 180.

Further, at this time, the claw portion 164 of the claw lever 162 comes to a position where it comes into contact with the outer periphery of the second rotating body 162.

As shown in FIG.
Since it comes into contact with the flange 16B, it meshes with the gear portion 170 and no undue force is applied to it.

Next, when the stop button (not shown) is pressed in the above-described reproduction mode, the motor rotates the drive gear 160 counterclockwise in FIG. 5, so the first rotating body 142 rotates clockwise in FIG. The brake control member 130 moves according to the cam diagram shown in FIG. At the same time, the pinch roller 192 separates from the capstan 72, the constant speed running of the magnetic tape 180 is stopped, the tape pull-out member 182 separates from the fixed member 184, and moves to the position corresponding to the stopped state, and the capstan 72 is moved away from the capstan 72 as shown in FIG. Since the rotation starts in the counterclockwise direction, the main idler 76 rotates clockwise in FIG. The magnetic tape 180 pulled out by rotating the magnetic tape 12 counterclockwise in FIG. 1 is wound onto the supply reel hub 16 without slack. In this way, the first rotating body 14
When the motor 2 rotates to the position shown in FIG. 3, a switch (not shown) is turned on and the rotation of the motor is stopped, resulting in a stopped mode.

Further, as shown in FIG. 7, when the first rotating body 142 rotates further counterclockwise from the reproduction mode, the recording pause mode is entered, and the brake control member 13o moves to the left in FIG. 6, as shown in FIG. 3. The position will be the same as the previous position. Therefore, both brakes 112 and 122 are securely still in contact with both reel stands 10 and 12 to prevent rotation, and at the same time, the pinch roller 192 is separated from the capstan 72 by the rotation of the second rotating body 162, etc., so that recording can be temporarily stopped. Needless to say, necessary operations are performed.

As described above in detail based on the embodiments, according to the present invention, even though a motor is used to switch the operation mode, the movement from the fast winding mode to the stop mode is quick and instantaneous braking operation is possible. The braking operation based on the detection of the end of the tape can also be performed reliably, and there is no longer an accident where the tape enters the end and excessive tension is applied to the tape. In addition, since the brake control member is operated by a grooved cam in modes other than the quick-start mode, the timing of the operation with other operating members can be set easily and reliably, and the operation stroke can also be reliably taken, so the brake control member can be controlled easily. Switching reliability is greatly improved. Furthermore, since the brake control member is moved by utilizing the engagement between the engaging portion provided on the rotating body and the first secured portion provided on the brake control member, the rotation radius can be reduced by setting the rotation radius of the securing portion. Since a large amount of movement of the brake control member can be secured even at corners, the reliability of brake operation and the degree of freedom in design are greatly improved. Further, since the brake control member can perform complicated operations using the grooved cam, accompanying operations such as contacting and separating the idler tires can be realized relatively easily. Furthermore, since it does not use a plunger, it is lightweight, inexpensive, and has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a front view of the main parts of an embodiment of the present invention, FIG. 2 is a schematic sectional view of the reel drive system of the same embodiment, FIG. 3 is a back view of the main parts of the embodiment in a stopped state, and FIG. The figure is a rear view of the main part in the fast winding mode of the same embodiment, FIG. 6 is a back view of the main part in the fast winding mode of the same embodiment, FIG. 6 is a schematic sectional view of the rotating body in the same embodiment, and FIG. It is a cam diagram of the rotating body in the same Example. 72... Capstan 8211e6@11
・Relay roller, 1o2...Idler tire, 1
12...@--Fist winding side brake, 122...
Supply side brake, 118・Life■・Kisokuhin, 13o
...■ Brake control member, 136, 138, 158
...Tension spring, 142...First rotating body, 144...Groove cam, 148...φ...Engaging part, 15o...0 claw part , 152■...Lever with claw, 164...e/0 claw part.

Claims (1)

[Claims] A reel stand that is coupled to a reel hub on which a magnetic tape can be wound and rotates integrally with the reel hub, a motor capable of forward and reverse rotation, and a rotating body that is driven by the motor in accordance with each operating mode of the magnetic tape device. and a grooved cam and a retaining portion provided on the rotary body, which are movable between a non-operating position and an operational position following the rotation of the rotary body, and perform a braking operation according to each operating mode of the magnetic tape device. a brake control member to be controlled; and a brake control member that engages with the retaining portion by rotation of the motor in one direction from a stopped state of the magnetic tape device to move the brake control member from a non-operating position to an operating position. The first secured portion provided on the member engages with the grooved cam provided on the rotary body by rotation of the motor in the other direction from the stopped state of the magnetic tape device to move the brake control member. installed in the brake control member.
and a second engaged portion of the order of magnitude, and the brake control is performed by engaging the engaging portion and the first engaged portion by rotation of the motor in one direction from a stopped state of the magnetic tape device. The member is moved to the operating position to release the braking force on the reel stand, and then, as the motor rotates in the other direction, the engagement release means releases the engagement and the braking force is applied to the reel stand. With such a configuration, when the motor rotates in the other direction from the stopped state, the brake control member is moved between a non-operating position and an operating position following the grooved cam to control the brake operation. Magnetic tape device 0 characterized by the configuration