JP2601251B2 - Mode selection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mode selection apparatus, and more particularly to a mode selection apparatus for performing recording and / or reproduction using a tape-shaped recording medium such as a tape recorder. And a suitable mode selection device.

[0002]

2. Description of the Related Art In a tape recorder in which recording and / or reproduction is performed by bringing a magnetic tape into contact with a head, it is necessary to selectively display various modes. In particular, when this mode selection operation is performed by feather touch, it is necessary to perform switching for mode selection by some driving source. Therefore, conventionally, the capstan model was added to the tape recorder.
In addition to the motor, a reel motor and plunger solenoid
Three or three assist motors are used in addition to the reel motor.

[0003]

The frequent use of electric components such as a motor and a plunger solenoid in a tape recorder leads to an increase in the cost of the mechanical deck of the tape recorder, which is not preferable.

The present invention has been made in view of the above problems, and reduces the number of electric components such as a motor and a plunger solenoid used for a mechanical deck of a tape recorder, thereby increasing costs. It is an object of the present invention to provide a mode selection device designed to be down.

[0005]

According to the present invention, there is provided a head substrate which is moved between a first position at which a head contacts a tape-shaped recording medium and a second position at which the head is separated from the tape-shaped recording medium. By selectively contacting a pair of pinch rollers with a pair of capstans, the traveling direction of the tape-shaped recording medium is changed to a first direction and a second direction opposite to the first direction.
Switching means for selectively switching the head substrate in the first and second directions, and at least first and second toothless portions, and for moving the head substrate between the first position and the second position. A toothless gear provided with a second cam, a third cam that drives the switching means to selectively contact the pair of pinch rollers with the pair of capstans, Having a pinion that meshes and rotationally drives the toothless gear, a transmission means for transmitting a driving force from a single drive source to the capstan, and a trigger for rotation of the toothless gear, Trigger means for performing a switching operation of the switching means. The trigger means moves the head substrate from the second position to the second position in a state where the first toothless portion and the pinion face each other. Moving to the position direction, the second
The switching means is switched by the reciprocating operation of the trigger means after the cam and the head substrate are engaged, and one of the capstans of the pair of capstans and the pinch rollers of the pair of pinch rollers are moved. The tape-shaped recording medium is driven in the first direction by making contact with one of the pinch rollers, and the pinion moves the toothless gear from the first toothless portion to the second toothless portion. The head substrate is held at the first position by rotating the head substrate so as to oppose it, and the switching unit is operated by the forward movement of the trigger unit after the second cam and the head substrate are engaged. Then, the other capstan of the pair of capstans is brought into contact with the other pinch roller of the pair of pinch rollers, thereby causing the tape-shaped recording medium to be in the second position. So that the head substrate is held at the first position by rotating the toothless gear from the first toothless portion to the second toothless portion by the pinion. It was done.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION

[1] Description of Structure A mode selector for a tape recorder according to an embodiment of the present invention will be described. As shown in FIGS.
This mode selection device includes a chassis 5, and a motor 6 is mounted on a lower surface of the chassis 5. A pulley 7 is fixed to the output shaft of the motor 6,
A first belt 8 is wound around the pulley 7, and is transmitted to a pair of cap stampers 9, 10. And the cap stamps 9 and 10 are F
The capstan 11 for WD and the capstan 12 for REV are fixed to each other.

The motor belt 7 further includes a second belt 1.
3 is transmitted to the high-speed pulley 14. And this high speed pool 14
Is supported on a switching lever 16 rotatably supported by a pin 15, and an intermediate drive gear 17 is mounted on the high speed pulley 14. The intermediate drive gear 17 is for selectively driving the pair of reel stands 18 and 19. When the supply reel stand 18 is driven, the intermediate drive gear 17 is driven directly by the gear 17 and the winding side. When the reel stand 19 is driven, the power is transmitted via the intermediate idler 20.

A head substrate 21 is arranged on the upper surface of the chassis 5. The head substrate 21 is slidably supported in the vertical direction in FIG. 1, and is pulled downward in FIG. This head substrate 2
1 includes a pair of abutting portions 23 and 24, and includes a pinch lever 2;
The rotation of 5, 26 is regulated. These levers 25 and 26 rotatably support pinch rollers 27 and 28, respectively, and are urged by springs 29 and 30 to rotate in the direction of contact with the capstans 11 and 12. I have.

Winding gears 31 and 32 are arranged near the capstans 11 and 12, respectively, and these gears 31 and 32 are supported rotatably about the capstans 11 and 12. Winding lever 33, 3
4 supported. And these levers 33, 3
4 is the above-mentioned reel table 1 by springs 35 and 36, respectively.
The gears 9 and 18 are urged in a direction to engage with the gears formed on the outer peripheral surface. The rotation of the levers 33, 34 is restricted by the bent pieces 37, 38 formed on both sides of the head substrate 21.

Next, the toothless gear 40 disposed on the lower surface of the chassis 5 and substantially at the center thereof will be described with reference to FIGS.
In addition, description will be made with reference to FIGS. FIG. 2
In, the toothless gear 40 is in a state viewed from the front side. On the other hand, the toothless gear 40 shown in FIG. 4 shows a state viewed from the back surface. For this reason, it should be noted that the toothless gear 40 is symmetrical in FIGS. 2 and 4. I want to be.

A first cam 41, a second cam 42, and a fifth cam 45 are formed on the surface of the toothless gear 40, respectively. On the other hand, a third cam 43 and a fourth cam 44 formed of grooves are formed on the back surface of the toothless gear 40. Further, a return projection 46 is formed on the back surface of the gear 40 in association with the fourth cam 44.

The first cam 41 and the second cam 42
Are engaged with the first engagement pins 47 implanted in the head substrate 21, thereby regulating the position of the head substrate 21. On the other hand, the third cam 43 is engaged with a second engagement pin 48 formed at the tip of the switching lever 16, thereby switching the intermediate drive gear 17. Further, the fourth cam 44 is adapted to be engaged with a third engagement pin 49 so that the switching slider 50 is moved to one of the left and right positions in FIGS. 1 and 2. I have. The slider 50 is biased rightward in FIG. 2 by a spring 51. Further, the fifth cam 45 comes into contact with a pin 53 implanted at the tip of the biasing lever 52. The lever 52 is rotatably supported by a pin 54, and the pin 53 is
5.

Further, the toothless gear 40 is formed with four toothless portions 56, 57, 58, 59 on the outer periphery thereof. As shown in FIG. 2 and FIG. 4, four projections 61, 62, 63,
64 are formed. These projections 61 to 64 correspond to the missing tooth portions 56 to 59. Further, the toothless gear 40 is driven by a pinion 65 fixed to the capstan 11. The four projections 61 to 64 come into contact with the stopper pins 67 of the trigger lever 66. Trigger lever 66 is pin 6
8 and is urged to rotate by a spring 69.
0 is engaged with the rod of the plunger 71. Further, a pressing arm 72 is formed on the lever 66 so as to press a pressed pin 73 implanted in the head substrate 21.

Next, the head supported on the head substrate 21 will be described. As shown in FIGS. 7 and 8, a substantially square frame 75 is mounted on the head substrate 21. A circular head holder 76 is rotatably supported by the frame 75. The recording / reproducing head 77 and the erasing head 78 are held by the head holder 76. Further, a gear 79 is provided on the head holder 76 so as to be engaged with the segment gear 80. Segment gear 8
0 has an arm 81 extending downward, and this arm 81 is received in a notch 82 of the switching slider 50. A toggle spring 83 is mounted between the pin of the segment gear 80 and the pin of the gear 79.

Therefore, the slider 5 below the head substrate 21
When 0 moves, the notch 82 of the slider 50 pushes the arm 81, and the segment gear 80 rotates. Since the gear 79 is driven by the gear 80, the head holder 76 holding the gear 79 is rotated by 180 degrees. As a result, as shown in FIGS. 7 and 8, the recording / reproducing head 77 and the erasing head 78 are switched in the FWD direction and the REV direction, respectively. In each position, the toggle spring 83 stably supports the head holder 76. [2] Description of operation The mode of the tape recorder in which the head is switched between the FWD direction and the REV direction is S.
TOP, FWD, REV, FF, REW, FWD RE
W AMS, FWD FF AMS, REV REW
There are nine modes, AMS and REVFF AMS. Thus, as shown in FIG. 9, when the matrix is formed by setting the position of the head in the forward direction and the head direction on the vertical axis and adjusting the switching position of the high-speed gear on the horizontal axis, the above modes are combined. Will be combined. The horizontal axis can be achieved by dividing the gear into four parts by forming four missing parts 56 to 59 on the missing gear 40. In this case, if two branches are performed when switching from the STOP mode to the PASS mode or the FWD mode / REV mode, ten modes including the PASS mode can be performed. Become. These modes will be sequentially described below.

(1) Switching to PASS mode (FIG. 1)
0, 11) When the plunger 71 is excited in the STOP mode shown in FIGS. 1 and 2, the trigger lever 66 whose engagement portion 70 is connected to the plunger rod is rotated, and the stopper pin 67 is separated from the first projection 61 formed on the back surface of the toothless gear 40. Thereby, the rotation of the toothless gear 40 becomes free. Further, the toothless gear 40 is connected to the fifth cam 4 by the pin 53 of the biasing lever 52.
5 is pressed, and is urged to rotate clockwise in FIGS. 10 and 11. Therefore, the toothless gear 40 starts rotating by the urging lever 52. When the toothless portion 56 separates from the pinion 65, the pinion 65 meshes with the toothless gear 40. Since the rotation of the motor 6 is transmitted to the pinion 65 through the pulley 7, the belt 8, the cap stamper 9, and the capstan 11, the pinion 65 causes the toothless gear 40 to rotate.
Is driven.

At the time of switching to the PASS mode, the plunger 71 is demagnetized immediately after being excited, so that the head substrate 21 is not pulled upward through the pressed pin 73. Therefore, the head substrate 21 is pulled downward by the spring 22, and the first engagement pin 47 moves to a position where it comes into contact with the first cam 41.

(2) Switching to FWD and REV (FIG. 1
2, FIG. 13) Plunger 71 to trigger rotation of toothless gear 40
When the plunger 71 is further excited after the excitation of the trigger lever, as shown in FIG.
The memory 72 pushes the pressed pin 73 implanted on the head substrate 21, thereby holding the head substrate 21 at the upper position in FIG. 12 against the spring 22. Accordingly, the first engagement pin 47 implanted in the head substrate 21 also moves upward, and the first engagement pin 47 engages with the second cam 42 of the toothless gear 40. Will be. As a result, switching to FWD and REV is performed.

(3) Switching to FWD (FIG. 14, FIG. 1)
5) First engagement pin 4 implanted in head substrate 21
If 7 engages the second cam 42 of the toothless gear 40,
In this state, the plunger 71 is deenergized. Then, the trigger lever 66 is moved back by the spring 69, and the stopper pin 67 moves rightward. That is, the pin 67 does not push the switching slider 50 leftward, and the slider 50 is moved rightward by the spring 51. Therefore, the pin 49 implanted in the slider 50 comes into contact with the outer peripheral side of the fourth cam 44 of the toothless gear 40. As a result, the slider 50 is held to the right. Therefore, as shown in FIG. 7, the positional relationship between the recording / reproducing head 77 and the erasing head 78 is in the FWD direction.

(4) Switching to REV (FIG. 16, FIG. 1)
7) If the plunger 71 continues to be excited after the first engagement pin 47 is engaged with the second cam 42, the REV mode
Mode. That is, when the plunger 71 is continuously excited, the trigger lever 66 is rotated clockwise, and the stopper pin 67 is moved to the switching slider 5.
0 will be pushed to the left. Therefore, after being implanted in the slider 50, the third engagement pin 49 comes into contact with the inside of the fourth cam 44 of the toothless gear 40, and the cam 44 pushes the slider 50 to the left. Will be bound as follows. Therefore, as shown in FIG. 8, the recording / reproducing head 77 and the erasing head 78 are in the REV direction.

(5) PASS mode (FIGS. 18 and 19) This PASS mode is an operation which does nothing in appearance and is the same as the STOP mode. That is, as shown in FIG. 9, the PASS mode includes the REW mode and the FF mode.
This is only a preparation mode for switching to the mode, the head substrate 21 is retracted, and the intermediate drive gear 17 is in the neutral position to drive any of the reel stands 18 and 19. I haven't. By setting such a PASS mode, it becomes possible to hold the head substrate 21 at an intermediate position in the AMS mode for performing automatic cueing of the tape. Can be lightly brought into sliding contact with the recording / reproducing head 77. Also, as shown in FIG.
A number of modes can be set.

(6) FWD mode (FIGS. 20 and 21) This FWD mode is similar to the FWD mode shown in FIGS. 14 and 15.
This is achieved by driving the toothless gear 40 with the pinion 65 in switching to the mode. Missing gear 4
0 is driven clockwise, and when the second projection 62 of the gear 40 abuts against the stopper pin 67 of the trigger lever 66, the pinion 65 is synchronized with the stopper pin 67 and the pinion 65
0 and the second missing tooth portion 57. As a result, the rotation of the toothless gear 40 stops. And at this time, gear 4
The head substrate 21 is held at the advanced position via the engagement pins 47 by the 0 second cam 42. At this time, the switching lever 16 is held at the intermediate position by the third cam 43 of the toothless gear 40 via the engaging pin 48, and the intermediate drive gear 17 is separated from the reel stand 18 and the intermediate idle vehicle 20. In position. Therefore, the pair of reel stands 18 and 19 are not driven by the gear 17.

Further, in this mode, since the pin 49 of the switching slider 50 is in contact with the outer peripheral side of the fourth cam 44, the slider 50 is located on the right side. With 82, the heads 77 and 78 are arranged in the FWD direction shown in FIG. Then, in order for the head substrate 21 to move forward, the contact portion 23 also moves forward, and the pinch lever 25 is rotated by the spring 29 to press the pinch roller 27 against the capstan 11. Therefore, the magnetic tape in contact with the head 77 is the capstan 1
1 to drive the vehicle. Further, since the bent piece 37 is advanced by the advance of the head substrate 21, the take-up lever 33 is rotated about the capstan 11 by the spring 35, and the take-up gear 31 is moved to the reel on the take-up side. It will engage with the base 19. Therefore, the traveling magnetic tape is wound up by the reel engaging with the reel stand 19. At this time, since the slider 50 has been moved to the right, the pins 87 and 88 prevent the left pinch lever 26 and the take-up lever 34 from rotating, respectively.
Is prevented from being pressed against the capstan 12 and the winding gear 32 is not engaged with the reel stand 18.

(7) REV mode (FIGS. 22 and 23) This mode is achieved by further driving the gear 40 using the pinion 65 in the state shown in FIGS. . And the above FW in this case
The difference from the switching to the D mode is that the plunger 71 is excited at this time. Therefore, the trigger lever
The lever 66 is rotated clockwise about the pin 68, and the stopper pin 67 of the lever 66 pushes the side of the switching slider 50. Therefore, the pin 49 implanted in the slider 50 is connected to the fourth cam 44 of the toothless gear 40.
Will be engaged inside. This allows the slider 5
0 is moved to the left as shown in FIGS. Therefore, the notch 82 of the slider 50 allows the recording / reproducing head 77 and the erasing head 7 to move as shown in FIG.
8 are inverted and arranged in the REV direction. Also at this time, the head substrate 21 is connected to the first engagement pin 47.
Are held in the advanced position by the second cam 42,
Moreover, the intermediate drive gear 17 is held at the neutral position by the third cam 43.

In order for the head substrate 21 to move forward, the contact portion 24 also moves forward, the pinch lever 26 is rotated, and the pinch roller 28 is pressed against the capstan 12,
The magnetic tape is driven to travel in the REV direction. At the same time, since the bent piece 38 of the head substrate 21 advances, the take-up lever 34 is rotated, and the take-up gear 32 is engaged with the reel base 18. Therefore, the magnetic tape that has traveled is wound up by the reel that engages with the reel base 18. At this time, the pins 89 and 90 of the slider 50 moved to the left prevent the pinch lever 25 and the take-up lever 33 from rotating. Therefore, the pinch roller 27 is not pressed against the capstan 11 and the winding gear 31 is not engaged with the reel stand 19.

(8) REW mode (FIGS. 24 and 25) This mode is switched from the PASS mode shown in FIGS. That is, in the PASS mode, the plunger 71 is excited, the trigger lever 66 is rotated, the toothless gear 40 is first rotated by the biasing lever 52, and the toothless gear 40 is continuously driven by the pinion 65. I do. Then, the next toothless portion 58 of the toothless gear 40 is rotated to a position facing the pinion 65.
As a result, the REW mode appears.

In this mode, since the engaging pin 47 is engaged with the first cam 41, the head substrate 21
Is in the retracted position. The engagement pin 49 is connected to the fourth cam 44.
The slider 50 is located on the right side because it is in contact with the outer peripheral side of the slider. Further, the lever 16 supporting the intermediate drive gear 17 is switched by the third cam 43, and the gear 17 is engaged with the reel stand 18 on the supply side. Therefore, the rotation of the motor 6 is controlled by the pulley 7, the belt 13, the high-speed pulley 14, and the intermediate drive gear 17.
And the reel table 18 is driven at a high speed. Therefore, the magnetic tape is wound in a reverse direction at a high speed without contacting the head.
And

(9) FWD REW AMS mode (FIGS. 26 and 27) This mode is achieved by further rotating the toothless gear 40 for one section in the FWD mode shown in FIGS. You. That is, in the FWD mode, the plug 7
When 1 is excited, the trigger lever 66 is rotated and triggered, so that the stopper pin 67 is disengaged from the second protrusion 62. First, the toothless gear 40 is rotationally driven by the urging lever 52 and then by the pinion 65. Is done. Then, while the third protrusion 63 abuts against the stopper pin 67,
When the pinion 65 faces the third missing tooth portion 58, the missing gear 40 stops its rotation, and the mode shown in FIGS. 26 and 27 is reached.

In this mode, the head substrate 21 is held at an intermediate position by the third portion of the second cam 42. Further, the intermediate drive gear 17 is engaged with the supply-side reel stand 18 by the third cam 43. In addition, the slider 50 is positioned on the right side by the pin 49 that contacts the outer peripheral surface of the fourth cam 44, and
The arrangement of 8 is in the FWD direction. Therefore, the magnetic tape is FW
The vehicle travels at a high speed in the reverse direction while lightly contacting the recording / reproducing head 77 in the D direction, and is wound up by the reels engaged with the reel table 18. Therefore, it is possible to perform cueing of a portion that has passed in the FWD direction.

(10) REV FF AMS Mode (FIGS. 28 and 29) In this mode, the toothless gear 40 is further driven to rotate by one section in the REV mode shown in FIGS. 22 and 23. Obtained by When the plunger 71 is excited to rotate the trigger lever 66 to release the engagement between the pin 67 and the second protrusion 62, the gear 40 is driven to rotate by the lever 52 and then by the pinion 65. Become. Then, at the positions shown in FIGS. 28 and 29,
The third protrusion 63 is locked by the pin 67, and the pinion 65 faces the third missing tooth portion 58, so that the missing gear 40 stops rotating.

In this mode, the head substrate 21 is held at the intermediate position by the third portion of the second cam 42, and the magnetic tape can be lightly brought into contact with the head 77. In this state, the third cam 43 switches the intermediate drive gear 17 to a position where the intermediate drive gear 17 is engaged with the reel base 18, and the reel base 18 is driven. At this time, the slider 50 is moved to the left by the pin 49 that contacts the inner peripheral side of the fourth cam 44,
7, 78 will be switched in the REV direction. Therefore, the magnetic tape is driven at a high speed in the REV direction while being lightly in contact with the heads 77 arranged in the REV direction in this manner, and is wound at a high speed by the reel engaged with the reel stand 18. Will be taken. Therefore, the cueing of the previous portion in the REV direction is performed.

(11) FF mode (FIGS. 30 and 31) In this mode, the plunger 71 is further excited in the REW mode shown in FIG. 24 and FIG.
The pinion 65 drives the toothless gear 40 to rotate by one section. The fourth toothless portion 59 of the gear 40 faces the pinion 65 so that the fourth protrusion 64 is moved by the trigger lever 66. The rotation of the gear 40 is regulated by making contact with the stopper pin 67.

In this mode, the head substrate 21 is held at the retracted position by the engagement pins 47 that come into contact with the first cam 41. Further, the intermediate drive gear 17 is switched to a position where the intermediate drive gear 17 is engaged with the intermediate idle wheel 20 by the second engagement pin 48 which comes into contact with the fourth portion of the third cam 43, and the reel stand 19 on the winding side is moved to Will be transmitted. At this time, the slider 50 is switched to the right by the third engagement pin 49 which engages with the fourth cam 44. Accordingly, the magnetic tape is driven to travel in the FWD direction without contacting the head, and is wound at a high speed by the reel engaged with the reel stand 19. When the trigger is further performed by the plunger 71 in this mode, the toothless gear 40 is further rotated by one section to return to the original STO.
It returns to the P state.

(12) FWD FF AMS mode (FIGS. 32 and 33) In this mode, the gear 40 is further rotated by one section in the modes shown in FIGS.
Abutting the protrusion 64 with the stopper pin 67,
The fourth toothless portion 59 is made to face the pinion 65. At this time, the head substrate 21 is held at the intermediate position by the fourth portion of the second cam 42 via the engaging pin 47, and the magnetic tape comes into sliding contact with the recording / reproducing head 77 lightly. Also, the third cam 43
Switches the lever 16 via the second engagement pin 48 to engage the intermediate drive gear 17 with the intermediate idler 20 and transmit it to the reel stand 19 on the winding side. Further, the slider 50 is positioned on the right side via a third engagement pin 49 passing through the outer peripheral side of the fourth cam 44. Therefore, the magnetic tape is driven to travel at a high speed by the reel engaged with the reel base 19 while being lightly in contact with the head 77 facing the FWD direction. Therefore, the cueing of the front portion in the FWD direction is performed. In this mode, the plunger 71
When the gear 40 is triggered via the lever 66, the gear 40 rotates one more section, returns to the original position, and enters the STOP mode.

(13) REV REW AMS mode (FIGS. 34 and 35) In this mode, the trigger is further applied by the plunger 71 in the mode shown in FIGS. The projection 64 of the drive gear 4 comes into contact with the stopper pin 67, and the pinion 65 stops at a position facing the toothless portion 59 of the drive gear 40. In this position, the head substrate 21 is moved to the intermediate position by the second cam 42,
The head 77 comes into light sliding contact with the magnetic tape. Further, the third cam 43 is switched so that the intermediate drive gear 17 is transmitted to the reel base 19 via the intermediate idler 20. Next, the switching slider 50 is positioned on the left side by the third engagement pin 49 that moves along the inner peripheral side of the fourth cam 44, whereby the heads 77 and 78 are arranged in the REV direction. . Therefore, the magnetic tape running while lightly contacting the recording / reproducing heads 77 arranged in the REV direction at a high speed and lightly is wound up at a high speed by the reels engaged with the reel table 19. For this reason, the cueing of the portion in the REV direction is performed. In this mode, when the plunger 71 is further triggered,
The toothless gear 40 further rotates one section, returns to the original position, and is switched to the STOP mode.

As described above, according to the mode selection device of the present embodiment, it is possible to perform all of the tape driving and mode switching by the single motor 6. As the electric parts, only the motor 6 and the plunger 71 are sufficient. Therefore, significant cost reduction can be achieved by omitting electric components. Further, by using the four cams 41 to 44 provided on the toothless gear 40,
The PASS mode can be set and a number of modes can be displayed.

[0037]

As described above, the present invention relates to a head substrate which is moved between a first position where a head contacts a tape-shaped recording medium and a second position where the head is separated from the tape-shaped recording medium. The traveling direction of the tape-shaped recording medium is selectively switched between a first direction and a second direction opposite to the first direction by selectively contacting a pair of pinch rollers with a pair of capstans. And first and second cams having at least a first and a second toothless portion for moving the head substrate between the first position and the second position. A toothless gear provided with a third cam for driving a switching means to selectively contact the pair of pinch rollers with the pair of capstans; and the toothless gear meshing with the toothless gear. Has a pinion that drives the gear to rotate Both a transmitting means for transmitting a driving force from a single driving source to the capstan, thereby triggering the rotation of the toothless gear, each comprise a triggering means for switching operation of said switching means,
The head substrate is moved from the second position to the first position by the trigger means in a state where the first toothless portion and the pinion face each other, and the second cam and the head are moved. The reversing operation of the trigger means after the substrate is engaged causes the switching means to perform a switching operation, thereby causing one of the pair of capstans and one of the pair of pinch rollers to perform a switching operation. To drive the tape-shaped recording medium in the first direction and rotate the toothless gear from the first toothless portion to the second toothless portion by the pinion. Holding the head substrate at the first position, and causing the switching means to perform a switching operation by a forward movement of the trigger means after the second cam and the head substrate are engaged. The tape-shaped recording medium is caused to travel in the second direction by bringing the other capstan of the pair of capstans into contact with the other pinch roller of the pair of pinch rollers, and the pinion allows the tape-shaped recording medium to travel. The toothless gear is rotated from the first toothless portion to the second toothless portion so as to hold the head substrate at the first position.

Thus, according to the present invention, the mode is selected by switching the running direction of the tape-shaped recording medium with a simple structure using a single drive source by the switching means, the toothless gear, the transmission means and the trigger means. Can be performed, and it is possible to provide a mode selection device that is advantageous in terms of cost.

[Brief description of the drawings]

FIG. 1 is a plan view of a mode selection device according to an embodiment of the present invention.

FIG. 2 is a plan view showing a back surface of a cam of the mode selection device according to the embodiment of the present invention.

FIG. 3 is a plan view of a cam of the mode selection device.

FIG. 4 is a bottom view of the same.

FIG. 5 is a sectional view taken along line A-A in FIG. 3;

FIG. 6 is a sectional view taken along line BB in FIG. 4;

FIG. 7 is a front view showing switching of a head direction.

FIG. 8 is a front view showing switching of the head direction in the opposite direction.

FIG. 9 is a block diagram showing the order of mode selection operation.

FIG. 10 is a plan view showing the operation of the mode selection device.

FIG. 11 is a plan view showing the operation of the mode selection device.

FIG. 12 is a plan view showing the operation of the mode selection device.

FIG. 13 is a plan view showing the operation of the mode selection device.

FIG. 14 is a plan view showing the operation of the mode selection device.

FIG. 15 is a plan view showing the operation of the mode selection device.

FIG. 16 is a plan view showing the operation of the mode selection device.

FIG. 17 is a plan view showing the operation of the mode selection device.

FIG. 18 is a plan view showing the operation of the mode selection device.

FIG. 19 is a plan view showing the operation of the mode selection device.

FIG. 20 is a plan view showing the operation of the mode selection device.

FIG. 21 is a plan view showing the operation of the mode selection device.

FIG. 22 is a plan view showing the operation of the mode selection device.

FIG. 23 is a plan view showing the operation of the mode selection device.

FIG. 24 is a plan view showing the operation of the mode selection device.

FIG. 25 is a plan view showing the operation of the mode selection device.

FIG. 26 is a plan view showing the operation of the mode selection device.

FIG. 27 is a plan view showing the operation of the mode selection device.

FIG. 28 is a plan view showing the operation of the mode selection device.

FIG. 29 is a plan view showing the operation of the mode selection device.

FIG. 30 is a plan view showing the operation of the mode selection device.

FIG. 31 is a plan view showing the operation of the mode selection device.

FIG. 32 is a plan view showing the operation of the mode selection device.

FIG. 33 is a plan view showing the operation of the mode selection device.

FIG. 34 is a plan view showing the operation of the mode selection device.

FIG. 35 is a plan view showing the operation of the mode selection device.

[Explanation of symbols]

5mm chassis, 6mm motor, 7mm pulley, 8mm
First belt, 9, 10 ° capstan pulley, 11
‥‥ Capstan for FWD, 12 ‥‥ Capstan for REV, 13 ‥‥ Second belt, 14 ‥‥ High speed pulley, 1
5 pin, 16 switch lever, 17 intermediate drive gear, 18 supply reel stand, 19 winding reel stand, 20 intermediate idle wheel, 21 head substrate, 22 inch
{Return spring, 23, 24} abutment portion, 25, 26} pinch lever, 27, 28} pinch roller, 29, 30
{Spring, 31, 32} Winding gear, 33, 34}
{Rewind lever, 35, 36} Spring, 37, 38}
Folded piece, 40 ° missing gear, 41 ° first cam, 4
2 {second cam, 43} third cam (groove), 44}
{Fourth cam, 45} Fifth cam, 46} Return projection, 47} First engagement pin, 48} Second engagement pin, 49} Third engagement Pin, 50 ° switching slider, 51 ° spring, 52 ° biasing lever, 53, 54 °
{Pin, 55} Spring, 56} First missing tooth, 57 #
{2nd missing tooth, 58} 3rd missing tooth, 59} 4th
Missing tooth portion, 61 ° first protrusion, 62 ° second protrusion,
63 ‥‥ third protrusion, 64 ‥‥ fourth protrusion, 65 ‥‥ pinion, 66 ‥‥ trigger lever, 67 ‥‥ stopper pin, 68 ‥‥ pin, 69 ‥‥ spring, 70 ‥‥ engagement Part, 7
1 ‥‥ plunger, 72 ‥‥ pressing arm, 73 ‥‥ pressed pin, 75 ‥‥ frame, 76 ‥‥ head holder, 7
7 ‥‥ recording / reproducing head, 78 ‥‥ erasing head, 79 ‥‥
Gear, 80 ° segment gear, 81 ° arm, 82
‥‥ Notch, 83 ‥‥ toggle spring, 87-90 ‥‥ pin

Claims (3)

(57) [Claims] A first position at which the head contacts the tape-shaped recording medium; and a second position at which the head is separated from the tape-shaped recording medium.
And a pair of pinch rollers selectively abutting on a pair of capstans to change the running direction of the tape-shaped recording medium between the first direction and the first direction. Has switching means for selectively switching in the opposite second direction, at least first and second missing teeth,
First and second cams for moving the head substrate between the first position and the second position, and selectively switching the pair of pinch rollers to the pair of capstans by driving the switching means. And a pinion that meshes with the toothless gear and drives the toothless gear to rotate. The driving force from a single drive source is provided. A transmission unit for transmitting to the capstan; and a trigger unit for triggering rotation of the toothless gear and performing a switching operation of the switching unit. The first toothless portion and the pinion Moving the head substrate from the second position in the direction of the first position by the trigger means in a state in which the second cam and the head substrate are engaged with each other. Return The tape-type recording medium is moved to the first position by operating one of the pair of capstans and one of the pair of pinch rollers by operating the switching means by a switching operation. And the pinion rotates the toothless gear from the first toothless portion to the second toothless portion to rotate the head substrate to the first position.
And the switching means is operated by the reciprocating operation of the trigger means after the second cam and the head substrate are engaged, and the other capstan of the pair of capstans is operated. The tape-shaped recording medium is caused to travel in the second direction by contacting the pinch roller with the other pinch roller of the pair of pinch rollers. From the first to the second missing tooth portion to rotate the head substrate to the first position.
A mode selection device, wherein the mode selection device is held at a position. 2. The apparatus according to claim 1, wherein said switching means includes a slider which moves left and right, and said pair of left and right pinch rollers selectively abut on a pair of left and right capstans by moving said slider to the left and right. The mode selection device according to claim 1, wherein: 3. The trigger means has a plunger and a trigger lever rotated by the plunger, and when the slider is pressed through the trigger lever by excitation of the plunger, the slider is moved to the toothless gear. The mode selecting device according to claim 2, wherein the third cam is moved to a position where the other pinch roller comes into contact with the other capstan.