JPH0654563B2 - Magnetic tape device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape device for recording / reproducing a signal by pulling out a magnetic tape from a tape cassette and advancing it to a magnetic head located outside the cassette.

2. Description of the Related Art In a conventional magnetic tape device such as a video tape recorder, a mode switching means for switching modes and a motor for driving the mode switching means are directly connected, as disclosed in Japanese Patent Laid-Open No. 58-147837. It has been decided that each mode mode is stopped by stopping the drive motor when the movable contact that moves following the mechanism when switching the mode and the fixed setting are electrically connected.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in such a configuration, an error in the positions of the movable contact and the fixed contact and a mechanical precision error of the mode switching means are added, and a predetermined mode mode is provided by the error. The drive motor will stop rotating at a position away from the position. Therefore, in the conventional configuration, in order to absorb the error, a cam is used in the mode switching means, and a section without a lift for absorbing the error is provided before and after the mode mode. However, the part without the lift is originally unnecessary.

Means for Solving the Problems In order to solve the problems, the magnetic tape device of the present invention is rotated and driven by a motor, and has a first clutch gear having a first pin hole and a first clutch gear. A second clutch gear that rotates coaxially with the clutch gear and that has a second pin hole; and a pin that slides in the second pin hole and that is biased in a direction away from the first clutch gear, The cam that is rotationally driven by the second clutch gear, the moving member that moves to a plurality of positions following the rotation of the cam and that switches to a mode corresponding to each mode position of the magnetic tape device, and the pin Has a pin pressing means for urging it toward the clutch gear side, the pin pressing means urges the pin toward the first clutch gear side, the pin fits into the first pin hole, and the first clutch gear And the second class The clutch means for transmitting the rotational drive force of the motor from the first clutch gear to the second clutch gear is provided between the mode switching means for switching the mode and the drive motor only when the clutch gear is connected.

Action The present invention, with the above-described configuration, can determine the mode mode only by the mechanical accuracy error without being affected by the error of the mode detection switch. Further, since the error of the mode detection switch does not affect the mode aspect, it does not require high accuracy as in the conventional case.

Embodiment An embodiment of the magnetic tape device of the present invention will be described below with reference to the drawings.

FIG. 1 shows a top view of this embodiment. In the drawing, the take-up reel stand 10 and the supply reel stand 12 rotatably fitted to the shafts 4 and 6 which are set up on the upper surface of the substrate 2 in the figure, when the cassette 20 is mounted at a predetermined position of the apparatus body, Engages with the take-up reel hub 14 and the supply reel hub 16 therein,
The claws 8 provided on the reel stands 10 and 12 can rotate integrally. FIG. 2 shows a cross-sectional view of the reel stand drive system. The take-up reel stand 10 and the supply reel stand 12 are respectively
Reel gears 30, 40, and the reel gears 30, 40
Is engaged with a take-up reel idler gear unit 52 and a supply reel idler gear unit 62 which are rotatably loosely fitted on shafts 50 and 60 which are erected on the substrate 2, and are rotationally driven. In the take-up reel idler gear unit 52 and the supply reel idler gear unit 62, as shown in FIG. 2, the rotations of the take-up reel idler gears a and 54a and the supply reel idler gears a and 64a are felts 56 and 6, respectively.
A friction member such as No. 6 was used. The structure is such that it is transmitted to the take-up reel idler gears b and 54b meshing with the reel gears 30 and 40 and the supply reel idler gears b and 64b via the clutch means.

On the other hand, the capstan 72 supported by the bearing member 70 fixed to the substrate 2 has a rotary roller portion 74 in a part thereof,
A predetermined crimping force is applied to the rotating roller portion 74, and the rotation is transmitted to the main idler 76 that is being crimped. The main idler 76 has a belt 84 stretched between a pulley portion 78 that is integrally formed and a relay roller 82 that is rotatably loosely fitted on a shaft 80 that is erected on the substrate 2. 82. A rotating arm 88 having a rotatable idler gear 86 supported at one end on the shaft 80.
Is loosely fitted, and a magnet 90, which is magnetized in multiple poles on the outer circumference, is mounted integrally so as to be substantially the same as the shaft 80. Further, a magnetic material 92 having a magnetically hysteresis characteristic is fixed on the inner circumference of the relay roller 82 so as to face the magnet 90 with a predetermined clearance, and a predetermined attraction force is generated between the magnet 90 and the magnet 90. The rotational force in the same direction as the rotation direction of the relay roller 82,
It is attached to the rotating arm 88. Furthermore, the idler gear 8
6 is always configured to mesh with the gear portion 94 provided on the relay roller 82, and depending on the operation mode of the apparatus, the rotation of the relay roller 82 causes the take-up reel idler gears a and 54a or the supply reel idler gear 6 to rotate. a, 64
The rotation of the capstan 72 is selectively transmitted to the take-up reel base 10 or the supply reel base 12 in accordance with the rotation direction of the capstan 72.

A pinch roller lever 22 is rotatably fitted on a shaft 18 erected on the substrate 2, and a pinch roller 192 is rotatably supported on a shaft 24 erected on one end of the pinch roller lever 22. Has been done. The shaft 26 erected on the substrate 2 is provided with a long hole 2 so as to be rotatable and slidable in the longitudinal direction.
A crimp lever 32 provided with 8 is loosely fitted, a pin 34 erected at one end of the crimp lever 32 is rotatably fitted with a connecting arm 36, and the other end of the connecting arm 36 has the other end of the pinch roller lever 22. It is loosely rotatably fitted to a pin 38 that is planted at the other end. A spring hook 42 is formed at the other end of the crimp lever 32, and a tension spring 44 is provided on the shaft 2.
6 and the spring hook 42, and the crimp lever 32 is stretched.
1 is urged upward in FIG. 1 so that the end of the elongated hole 28 and the shaft 26 are in contact with each other. That is, the pinch roller lever 2
2, the connecting arm 36, and the crimping lever 32 constitute a so-called toggle mechanism. At the other end of the crimp lever 32, a pin 46 extends through a hole (not shown) provided in the substrate 2 toward the back surface of the device, and a main rod 48 to be described later is provided.
It is configured to come into contact with the bent portion 21 provided on the. Therefore, when the main rod 48, which will be described later in FIG. 1, moves to the left, the bending portion 21 is in contact with the pin 46, so that the crimping lever 32 is rotated clockwise, and the pinch roller lever 22 moves counterclockwise. The pinch roller 192 is rotated until it comes into contact with the capstan 72. Although the pinch roller lever 22 is not rotated after that, the pressure bonding lever 32 continues to rotate clockwise and resists the biasing force of the tension spring 44, so that the pressure bonding lever 32 is guided by the elongated hole 28 to move to the third position.
The pinch roller 192 is moved downward in the figure, and at the same time, the pinch roller 192 is pressed against the capstan 72 with a predetermined pressing force. In the reproduction mode, as shown in FIG. 3, the supply reel hub 16
The magnetic tape 180 wound on the upper side of the cassette 20 guides the tape pull-out members 182, 183 having the guide posts 23, 25 and 27, 29 planted from the front surface of the cassette 20 with the guide grooves 31, 33, respectively, and the fixing member 184. The rotary magnetic head 18 is pulled out by moving to 185.
6 and a fixed head 188 for recording / reproducing an audio signal and a tape guide 190 fixed to the substrate 2.
Further, since the capstan 72 rotates clockwise in FIG. 3, the main idler 76 rotates counterclockwise in FIG. 3, and the belt 84 and the relay roller 82 also rotate counterclockwise in FIG. Therefore, the rotating arm 88 is given a turning force in the clockwise direction in FIG. 3 about the shaft 80, and the idler gear 86 rotating in the clockwise direction in FIG. 3 meshes with the take-up reel idler gears a and 54a. The take-up reel stand 10 rotates in the clockwise direction via the above-mentioned clutch means, and the magnetic tape 180 fed at a constant speed by the cooperation of the pinch roller 192 and the capstan 72 is wound around the take-up reel hub 14 without sagging. Turn around.

On the other hand, a drive gear 160 driven by a motor (not shown) is provided on the back surface of the substrate 2 shown in FIG.
It has a gear on its outer periphery and meshes with a first clutch gear, that is, a clutch input gear 120, which is freely rotatably fitted to a shaft 157 that is erected on the base plate 2. 5, 6 and 7
As shown, the same shaft 157 as the clutch input gear 120
The second clutch gear loosely rotatably fitted in the clutch output gear 121, that is, the pin 122 slidably held in the clutch output gear 121 in a direction substantially parallel to the shaft 157, is always held by the compression spring 123 in FIG. Is biased above the drawing. Pin 1 slidably held on the substrate 2
29 is the pin 122 and the leaf spring portion 12 of the rotating arm 124.
It is sandwiched by 4a. The rotating arm 124 is rotatably supported by a 126 that is planted on a support plate 125 fixed to the base plate 2, is engaged with a solenoid 128 by a pin 124b that is planted at one end, and is always kept by a tension spring 127. Fig. 5 It is urged to rotate counterclockwise.

In FIG. 5, when the solenoid 128 is energized, the solenoid 128 causes the rotating arm 124 to rotate clockwise in FIG. 5, the leaf spring portion 124a presses the pin 129, and the pin 129 presses the pin 122. However, since the clutch input gear 120 is rotated by a motor (not shown), the hole 120a and the pin 122 may not be coaxial with each other, and at that time, the leaf spring portion 124a bends and as shown in FIG. Become. When the clutch input gear 120 further rotates and the hole 120a and the pin 122 come coaxially,
The pin 122 slides downward in the drawing of FIG. 6 due to the urging force of the leaf spring portion 124a, and the clutch input gear 120 and the clutch output gear 121 are engaged via the pin 122 as shown in FIG. 120 and the clutch output gear 121 rotate integrally. Conversely, when the energization of the solenoid 128 is stopped in the state shown in FIG. 7, the tension spring 12
7, the rotating arm 124 is rotated counterclockwise in FIG. In this state, when the clutch output gear 121 rotates and the pin 122 comes coaxial with the hole 119 opened in the base plate 2, the pins 122 and 129 are moved upward by the urging force of the compression spring 123. 5 and the state shown in FIG. 5 is reached, so that the engagement relationship between the clutch input gear 120 and the clutch output gear 121 is released. The clutch output gear 121 has a gear on its outer periphery, and is meshed with a sub cam 142 that is rotatably loosely fitted to a shaft 156 that is erected on the base plate 2. Further, the sub-cam 142 is rotatably loosely fitted to a shaft 164 erected on the base plate 2 and has a gear having the same number of teeth as the outer peripheral gear of the sub-cam 142 so that the sub-cam 142 rotates synchronously with the sub-cam 142 at the same angle. Main cam 16
2 and the main cam 162 is 3 as shown in FIG.
The positive cam has a groove 166 extending over 60 ° or more, and its lift curve is such that a cam follower 165 described later moves only in a section where the lift amount changes, as shown in FIG. Further, the rotary shaft 4 of the take-up reel stand 10 extending from the front surface to the rear surface of the substrate 2 is rotated by the rotary shaft 50 of the take-up idler gear unit 52, the guide shaft 132 installed on the rear surface of the substrate 2, and the main cam 162. A main rod 48 having a cam follower 165 that engages with the groove 166 of the main cam 162 is attached to the moving shaft 164.
Along the guide grooves 35, 37, 39, 41 provided in
It is loosely fitted so that it can move back and forth. Further main rod 48
The bent portion 21 is provided at the end of the crimp lever 32 so as to come into contact with the pin 46 provided at the other end of the crimp lever 32. The sub cam 142 is also a positive cam having a groove 144 extending over 360 ° as shown in FIG. 9, and its lift curve is only in a section where the lift amount changes as shown in FIG. The sub rod 130, which is partially shown by a chain line and has a cam follower 146 that engages with the groove 144, reciprocates similarly to the main rod 48.

Further, as shown in FIG. 4, a detection switch 43, which meshes with the sub-cam 142 and can detect a predetermined rotation angle of the sub-cam 142, is attached to the back surface of the substrate 2 with a screw. A detailed description of the structure of the detection switch 43 can be realized by known means, but a detailed description thereof will be omitted, but fixed contacts are arranged as shown in the timing chart of FIG.

Further, since it is a content that can be realized by a known means, detailed description thereof will be omitted, but the tape pull-out members 182 and 183 are configured to move according to the rotation of the main cam 162.
As shown in the drawing, the movement of the tape pull-out members 182, 183 is performed within the rotation angle range of the main cam 162 shown in FIG. .

Next, the operation of the embodiment of the present invention will be described.

When the reproduction button (not shown) is pressed from the stop mode shown in FIGS. 1 and 4, the drive gear 160 driven by the motor (not shown) starts rotating counterclockwise in FIG.
In FIG. 5, a motor (not shown) starts rotating, and at the same time, the rotating arm 124 is rotated clockwise by the solenoid 128. If the pin 122 and the hole 120a of the clutch input gear 120 are on the same axis, the state shown in FIG. 7 is obtained. If the pin 122 and the hole 120a of the clutch input gear 120 are not on the same axis, the sixth state is obtained. As shown in the figure, since the clutch input gear 120 meshing with the drive gear 160 is rotating, the pin 122 and the hole 120a of the clutch input gear 120 eventually come to be coaxial with each other. In the state shown in FIG. 7, the clutch input gear 120 and the clutch output gear 121 start rotating integrally. The clutch output gear 121 includes a sub cam 142.
And the main cam 162 are rotated counterclockwise and clockwise in FIG. 4, respectively. The rotation angle of the main cam 162 is 40 °
When the tape is pulled out, the tape pull-out members 182 and 183 start moving, and the magnetic tape 180 starts to be pulled out from the cassette 20. At the same time, the main rod 48 also follows the groove 166 and starts moving rightward in FIG. Lever 2
2 starts turning. Then, the cam 162 rotates at the rotation angle of 150.
When the tape pulling members 182 and 183 have been rotated up to the angle of 0 °, the movement of the tape pulling members 182 and 183 is completed, and the state shown in FIG. 3 is obtained. At this time, as shown in FIG. 9, the main rod 48 is about 4.5 mm to the right in FIG.
Moving, the pinch roller 192 moves the capstan 72
To start contact with. Furthermore, the cam 162 has a rotation angle of 165 °.
By continuing the rotation up to, the detection switch 43 is brought into an electrically conducting state and the energization of the solenoid 128 is stopped. Even when the energization of the solenoid 128 is stopped, the clutch input gear 120 and the clutch output gear 121 rotate integrally until the pin 122 and the hole 119 of the substrate 2 are coaxial.
When the pin 122 and the hole 119 of the substrate 2 come coaxially, the pin 122 slides by the urging force of the compression spring 123,
In the state shown in FIG. 5, the driving force of the motor (not shown) is not transmitted to the sub cam 142 and the main cam 162, and the rotation of the sub cam 142 and the main cam 162 is stopped. At this time, the main rod 48 moves 6 mm to the right in FIG. 4, and the capstan 7 of the pinch roller 192 moves.
The predetermined crimping for 2 is completed. Due to the configuration described above, the clutch input gear 120 and the clutch output gear 121
It is possible to disengage the clutch output gear 121 when the clutch output gear 121 is rotated by an integral multiple of 360 °. Since the ratio is 1 to 2, each mode is set at a position where the rotation angle of the sub cam 142 and the main cam 162 becomes an integral multiple of 180 °.

Further, when the rotation of the sub cam 142 and the main cam 162 is stopped, the capstan 72 rotates clockwise in FIG.
The main idler 76 is rotated counterclockwise in FIG. Therefore, the belt 84, the relay roller 82, the rotating arm 8
8 also rotates counterclockwise in FIG. 3, and the idler gear 86 rotating clockwise in FIG. 3 meshes with the take-up reel idler gears a and 54a and the take-up reel stand 10 via the above-mentioned clutch means. Will rotate clockwise in Fig. 3,
The magnetic tape 180 fed at a constant speed by the cooperation of the pinch roller 192 and the capstan 72 is wound around the take-up reel hub 14 without sagging, and a reproduction mode is set.

Next, when the stop button (not shown) is pressed, the motor rotates in the reverse direction and the clutch input gear 120 and the clutch output gear 121 are engaged, and the sub-cams 142, The main cam 162 starts rotating clockwise and counterclockwise in FIG. 4, separates the pinch roller 192 and the capstan 72, and moves the tape pull-out members 182 and 183 toward the cassette 20. Further, the capstan 72 rotates in the clockwise direction shown in FIG. 3, and the idler gear 86 serves as the supply reel idler gear a,
The supply reel base 12 meshes with 64a and is rotated counterclockwise in FIG. 3, and the drawn magnetic tape is wound around the supply reel hub 16 without slack. When the rotation angle of the sub cam 142 and the main cam 162 becomes 15 °, the detection switch is brought into an electrically conducting state, so that the energization of the solenoid 128 is stopped, and the rotation of the sub cam 142 and the main cam 162 is performed in the same manner as in the case of the regeneration mode. The clutch input gear 120 and the clutch output gear 121 are disengaged from each other at a position of an angle of 0 °, and the rotations of the sub cam 142 and the main cam 162 are stopped to be in the stop mode shown in FIG.

Advantageous Effects of Invention The magnetic tape device of the present invention is rotated and driven by a motor, and is rotated coaxially with the first clutch gear having the first pin hole and the first clutch gear.
A second clutch gear having a second pin hole, a pin that slides in the second pin hole and is biased in a direction away from the first clutch gear, and is rotationally driven by the second clutch gear. The cam, the moving member that moves to a plurality of positions following the rotation of the cam, and switches to a mode corresponding to each mode position of the magnetic tape device, and the pin
Has a pin pressing means for urging it toward the clutch gear side, the pin pressing means urges the pin toward the first clutch gear side, the pin fits into the first pin hole, and the first clutch gear And only when the second clutch gear is connected
Since the clutch means for transmitting the rotational driving force of the motor from the second clutch gear to the second clutch gear is provided between the mode switching means for switching the mode and the drive motor, each mode position is detected as in the conventional configuration. Since there is no error in the accuracy of the switch, the section of the cam without lift can be shortened and the section with lift can be lengthened. Therefore, since the pressure angle of the cam can be reduced, the driving load can be reduced. By that,
The drive motor can also be made small and power consumption can be suppressed.

Further, since the error of the mode detection switch does not influence the determination of the mode position, the accuracy of the mode detection switch can be made coarser than that of the conventional one, so that the cost of the conventionally expensive mode detection switch can be reduced.

[Brief description of drawings]

FIG. 1 is a front view of a main part in a stop mode of the present invention, FIG. 2 is a schematic sectional view of a reel drive system, FIG. 3 is a front view of a main part in a reproduction mode, and FIG. Figure, fifth
FIGS. 6, 6 and 7 are schematic cross-sectional views of the power transmission clutch unit, FIG. 8 is an exploded perspective view of essential parts of the power transmission clutch unit, and FIG. 9 is a lift curve diagram of the cam of the present invention, and FIG. FIG. 11 is a front view of a main part in a stopped mode showing a conventional example, and FIG. 11 is a rear view of a main part in a stopped mode showing a conventional example. 43 ... Detection switch, 120 ... Clutch input gear,
121 ... clutch output gear, 128 ... solenoid,
48 ... Main rod, 130 ... Sub rod, 142
...... Sub cam, 160 ...... Drive gear, 162 ...... Main cam.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Kaoru Matsuoka, 1006 Kadoma, Kadoma City, Osaka Prefecture, Matsushita Electric Industrial Co., Ltd. (72) Hironori Honjo, 1006, Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 72) Inventor Noriyuki Shimizu 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A motor is rotated and driven, and
A first clutch gear having a first pin hole, a second clutch gear that rotates coaxially with the first clutch gear, and has a second pin hole, and a second pin hole. A pin that moves and is biased in a direction away from the first clutch gear, a cam that is rotationally driven by the second clutch gear, and a plurality of positions that follow the rotation of the cam. A moving member for switching to a mode corresponding to each mode position of the magnetic tape device, and a pin pressing means for urging the pin toward the first clutch gear side. Of the first clutch gear, the pin is fitted into the first pin hole, and the first clutch gear and the second clutch gear are connected. Second class Magnetic tape apparatus characterized by transmitting a rotational driving force of the motor to Chigia.