JPS5914819B2 - Locking device for movable tape guide in tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a head knocking device for a movable tape guide in a tape recorder.

0 Conventionally, a tape recorder, particularly one shown in FIG. 1, is known as a tape recorder capable of reciprocating recording and playback.

In the figure, 1a and Ib are reel stands, and different reels 2a and 2b can be attached to these reel stands, respectively. 3a and 53b are tape guides; 4 is a capstan; these tape guides 3a and 3b and the capstan 4 form a running path for the tape 5;
A first head group 6a and a second head group 6b are arranged along this travel path.

These head groups 06b are arranged. These head groups 6a and 6b are erase heads 7a and □b, respectively)
It is composed of a recording head Ba, 8b) and a reproduction head 9a, 9b. In the above tape recorder, the tape 5 is pressed against the capstan 25 by the pitch roller 10,
Depending on the direction of rotation of the capstan 4, the tape 5 is run at a constant speed in the direction of arrow A or in the opposite direction to the direction of arrow A, and this tape 5 is wound up by reel 2a or 2b.

When the tape 5 is run in the direction of arrow A, the first head group 6a is activated, and when the tape 5 is run in the direction opposite to arrow A, the second head group 6b is activated. By the way, recently, reel-to-reel type tape recorders (deck) as shown in Figure 1 are also used in combination with a tuner, 35 preamplifier, main amplifier, cassette deck, etc., so they are all stacked on top of each other. is desired.

In this way, tape recorders with a short outer casing dimension 1 in the height direction are preferable for stacking. In order to shorten dimension 1 in the tape recorder shown in Figure 1,
It is conceivable to arrange the head groups 6a, 6b1, capstan 4, tape guides 3a, 3b, etc. on a common tangent line 11 to the outer periphery of the reels 2a, 2b. However, in order to arrange the head groups 6a, 6b, etc. on this connection 11, the section of this connection must be made sufficiently long, and the interval between the reel stands 1a, 1b, that is, the width of the tape recorder, becomes abnormally large. In addition, arranging the head groups 6a and 6b on a straight line such as the tangent line 11 has the disadvantage that tape contact with the heads is poor and is not practical. In order to achieve sufficient tape contact, it is necessary to make the tape running path arcuate, and if the tape running path is made arcuate, the above-mentioned dimension 1 increases. The tape recorder shown in FIG. 2 can be considered as a tape recorder that can eliminate the above-mentioned drawbacks, reduce the dimension 1, and have a good tape per tape recorder.

In FIG. 2, the same reference numerals as in FIG. 1 indicate the same elements. Reference numeral 3 is a tape guide consisting of a guide roller,
It is arranged between the two reel stands 1a and 1b.
4a, 4b are capstans, and the reels 2a, 2
It is disposed near a common tangent line 11 of the outer circumference of b.

The tape guide 3 and the capstans 4a, 4b form a running path for the tape 5 along the outer periphery of the reels 2a, 2b. Pinch rollers 10a and 10b press the tape 5 against the capstans 4a and 4b.

In the tape recorder shown in FIG. 2 above, - pinch roller 10
When the tape 5 is pressed against the capstan 4a by a, the tape 5 runs at a constant speed in the direction of the arrow A, and when the pinch roller 10b is pressed against the capstan 4b, the tape 5 runs at a constant speed in the direction opposite to the arrow A. .

As mentioned above, in the above tape recorder, since the head groups 6a and 6b are not arranged below the tangent line 11, the height dimension 1 of the tape recorder can be shortened.
Further, since the tape running path is formed approximately along a part of the outer periphery of the reel, sufficient contact between the tape and the head can be achieved.

By the way, in the one shown in FIG. 2, the tape 5 is on the reel 2.
From a, from between the capstan 4b and the pinch roller 10b, the head group 6b1 tape guide 3, and the head group 6a
and reaches the reel 2b, passing between the capstan 4a and the pinch roller 10b. Therefore, when mounting the tape, the work of wrapping the tape along the path of the tape becomes complicated. Therefore, in the tape recorder as shown in FIG. 2, the tape guide is made movable in order to facilitate the mounting of the tape, and the tape is loaded with the tape guide located outside the substantially tangential line described above. It is conceivable that the tape be brought into contact with the magnetic head group by mounting the tape and then bringing the tape guide between the two reels. Such a movable tape guide requires a locking device that can withstand at least the tape tension during tape running. The present invention provides a locking device for a movable tape guide in a tape recorder, which is suitable for the locking device described above. An embodiment of the present invention will be described in detail below with reference to FIGS. 3 to 13.

FIG. 3 shows a reel-to-reel tape recorder, and parts not directly related to the present invention are omitted.

Further, the front panel, substrate, sub-board, etc. of the tape recorder are shown in a transparent state and are omitted from illustration, and the stopped state is shown. In Fig. 3, reference numeral 1
a and 1b are well-known reel stands, and these reel stands 1
Reels 2a and 2b are attached to a and 1b, respectively.

3 is a tape guide (roller), which is movable as described later.

4a and 4b are well-known capstans, 5('i tape, 6
a, 6b are magnetic head groups, 7a, 7b are erase heads, 8
a, 8b are recording heads, 9a, 9b are playback heads, 10
Reference numerals a and 10b are pinch rollers, which have been explained with reference to FIG. 2 above.

The heads 6a, 6b are mounted (adjustably, as is well known) on the substrate described above.

12a, 12b, 13a, and 13b are tape guide pins implanted in the substrate.

Tension arms 14a and 14b are rotatably attached to the substrate with 15a and 115b as fulcrums, respectively.

Further, tape guide pins 16a, 16b are implanted in these arms 14a, 14b. Arms 17a and 17b are rotatably attached to the substrate using fulcrums 18a and 18b, respectively, and the pinch rollers 10a and 10b are rotatably attached to these arms, respectively.

Reference numeral 19 denotes a v-block to be described later, and 20a and 20b denote guides to be described later, which are fixed to the substrate.

Reference numeral 21 denotes a large-diameter gear, which is rotatably attached to the base plate and has a notch 22 on its circumferential surface.

Due to the rotation of the gear 21, the tape guide 3 is moved along the guides 20a and 20b from the outside of the substantially tangent line 11 (shown in FIG. 3) explained with reference to FIG. 2, as described later, and as shown in FIG. It reaches a position between the wheels 2a and 2b.

As a result, the tape 5 is brought into contact with the head groups 6a and 6b. FIG. 5 shows a mechanism for moving the tape guide 3, etc., and in the state shown in FIG.
, 2b1 guide 20a, 20b1 head groups 6a, 6b, etc. are removed.

In FIG. 5, flywheels 23a and 23b are fixed to the capstans 4a and 4b in a well-known manner. A gear 24 is fixed to the capstan 4a, and the gear 24 meshes with the gear 21.

A small gear 25 is fixed concentrically to this gear 21, and this gear 25 meshes with a gear 26 (shown in FIG. 6), which will be described later. This gear 26 is rotatably attached to a shaft 28 fixed to a sub-board 27 fixed to the board. A plate 29 is integrally formed on the shaft 28, and a gear 30 is fixed to the plate 29. A cam 31, which will be described later, is integrally formed with the gear 26, and the arm 3
2 is fixed. Gears 35 and 36 are rotatably attached to this arm 32 using 33 and 34 as fulcrums, respectively. The gears 25 and 36 are meshed with each other, and the gears 25, 26, 30, 35, and 36 have a tooth ratio of 1:2:2:
The ratio is 1:1. That is, when the gear 25 rotates once,
The gear 26 rotates half a rotation and the arm 32 rotates a half rotation, which causes the gear 35 to rotate one rotation with respect to the arm 32, and thereby the gear 36 also rotates one rotation. An arm 37 is fixed to the gear 36, and a pin 38 is implanted in the arm.

An arm 39 is rotatably attached to this pin 38. Pins 40 and 41 are implanted in this arm 39,
As shown in FIGS. 6 and 7, long holes 43a and 43b of a roller holder 42 are fitted into these pins 40 and 41, and the roller holder 42 is slidably attached to the arm 39. An index spring 44 is stretched between the pin 41 and the holder 42, and a roller housing 45 is fixed to the holder 42, and a shaft to which the tape guide (roller) 3 is fixed is fixed to the holder 42. 46 is rotatably fitted, and a shutter 47, which will be described later, is fixed to this shaft 46. As shown in FIG. 8, the holder 42 is fitted into the grooves of the guides 20a, 20b, and is movable along the guides 20a, 20b.
In FIG. 6, reference numerals 48 and 49 indicate a light emitting element and a light receiving element, which are fixed to the substrate, and the light reaching the light receiving element 49 from the light emitting element 48 is intermittently blocked by the rotation of the shutter 47. The number of rotations of the tape guide 3 is detected. In FIG. 5, 50 is a sliding rod, and long holes 51a and 51b of the rod are slidably fitted into pins 52a and 52b implanted in the substrate, so that the sliding rod 50 is It is slidably attached to the board. The rise of one end of this sliding rod 50 is caused by the cam 3
1, and the elongated holes 53a, 5 of the sliding piece 50
3b has a pin 55a implanted in the arms 54a, 54b.
, 55b are loosely fitted, and these arms 54a, 54b are rotatably attached to the substrate using fulcrums 56a, 56b, respectively. These arms 54a, 54b
pin 57 as shown only for arm 54b.
is implanted, and the pin 57 is in contact with the arms 17a, 17b. These arms 17a, 17b are biased by springs 58a, 58b. Arm 17 above
a, 17b, only the arm 17b has 5 as shown in the figure.
An arm 60 is rotatably attached around 9 as a fulcrum, and a pin 61 is implanted in this arm 60. Reference numeral 62 denotes an arm, which is rotatably attached to the substrate using 63 as a fulcrum, the pin 61 is loosely fitted into the elongated hole 64 at one end, and the arm 14a, which is shown only for the arm 14b, is at the other end. , 14b.

As shown in FIG. 9, the arm 60 has a raised portion 6.
6. A hole is bored in the vertical portion 67, and a sliding piece 68 is slidably fitted into the hole. This sliding piece 68 has a pin 6
9 is implanted, and a traction spring 70 is stretched between the pin and the arm 60. An arm 71 is rotatably attached to the board using 72 as a fulcrum, one end of which is rotatably attached to the sliding piece 68 about the pin 69, and the other end is attached to a link 74 with 73 as a fulcrum. The actuating rod 76 of the electromagnetic plunger 75 is connected to the actuating rod 76 of the electromagnetic plunger 75 via the actuating rod 76 of the electromagnetic plunger 75.

Elements equivalent to the electromagnetic plunger 75, arms 71, 62, 60, sliding piece 68, etc. are also provided on the arms 17a, 14a.

Reference numeral 77 denotes a motor, and by means of a belt 78 that is wound around the flywheels 23a and 23b from the motor, these flywheels are rotated in opposite directions, that is, 23a is rotated clockwise and 23b is rotated counterclockwise. .

FIG. 10 shows a mechanism for starting the gear 2, and this mechanism is omitted in FIG. 5 to avoid complication of the drawing.

In FIG. 10, 79 is an arm, which is rotatably attached to the gear 21 with 80 as a fulcrum. This arm 79 is biased clockwise with respect to the gear 21 by a traction spring 81, and one end is engaged with a pin 82, which will be described later.
The other end can face the passage of claws 83a and 83b protruding from the gear 24. Reference numeral 84 denotes an arm, which is rotatably attached to the gear 21 with 85 as a fulcrum.
6 biases the gear 21 counterclockwise.

The pin 82 is implanted at one end of this arm 84,
The pin 82 is pressed against the arm 79 by the spring 86. Reference numeral 87 denotes an arm, which is rotatably attached to the gear 21 about the fulcrum 845, and the vertical portion 88 of the arm 87 is attached to the arm 84 by a spring 89 which biases the arms 84 and 87 so as to pull them together. is pressed against.

Reference numeral 90 denotes an arm, which is rotatably attached to the base plate using 91 as a fulcrum. A pin 92 is directly installed at one end of the arm, and the other end is connected to an operating rod 94 of an electromagnetic plunger 93.

This arm 90 is biased clockwise by a traction spring 95 and is pressed against a stopper 96 implanted in the base plate. Numeral 97 is an arm, which is rotatably attached to the base plate with 98 as a fulcrum, and is biased counterclockwise by a traction spring 99.

A pin 100 is implanted at one end of the arm 97, and the pin 100 is pressed against a cam surface 101 integrally formed with the gear 21 by the spring 99. In the tape recorder described above, in the state shown in FIG.
The reels 2a and 2b are attached to the capstans 4a and 1b in a well-known manner, and the tape 5 is attached to the capstans 4a and 4b and the pinch rollers 10a and 1b.
10b, along the substantially tangent line 11 mentioned above.

In this state, as shown in FIG. 11, the arm 17b of the pinch roller 10b is biased clockwise by the spring 10b, and this bias presses the pin 57, and the arm 54b is biased counterclockwise. As a result, the sliding rod 50
is pressed against the cam 31, and the sliding rod 50 is pressed against the cam 31.
1, the sliding rod 50 comes closest to the center of the gear 30, and therefore the arm 17b is rotated so that the pinch roller 10b is sufficiently far away from the capstan 4b. ing. Also, this arm 17b
As a result of the rotation, the arm 62 via the arm 60 is rotated clockwise, which presses the pin 65, and the tension arm 14b is rotated counterclockwise against a well-known tension spring (not shown). It is being rotated. Although the above explanation relates to the pinch roller 10b and the tension arm 14b, the tape 5 shown in FIG. It has been moved to a more convenient location. With the tape 5 mounted as shown in FIG. 3, the electromagnetic plunger 93 shown in FIG. 10 is momentarily excited.

Due to the excitation of the plunger 93, the arm 90 is activated by the spring 9.
5 and rotated counterclockwise. This rotation causes
The arm 87 is pressed by the pin 92 of the arm 90, and due to the pressing, the vertical portion 88 presses the arm 84,
This pressing causes the arm 84 to rotate clockwise against the spring 86, and this rotation causes the pin 82 to separate from the arm 79, causing the arm 79 to rotate clockwise due to the spring 81. Due to this rotation, the arm 79 comes into contact with the pin 102 implanted in the substrate as shown by the chain line 79, and the arm 79
The end of the claw 8 reaches within the path of the claws 83a and 83b, and the end of the claw 8
The arm 79 is pressed by 3a and 83b. Due to this pressure, the gear 21 is rotated in the direction of the arrow B, and due to this rotation, the gear 21 is meshed with the gear 24, and the gear 21 is rotated in the direction of the arrow B.
rotated in the direction When the end side edge of the arm 79 reaches the position of the pin 102 due to the rotation of the gear 21, the arm 79 returns to the position shown by the substantially solid line, and since the plunger 93 is not excited at this time, the pin 82 The arm 79 returns to the position shown by the solid line in FIG. 10, and the arm 79 becomes locked. Therefore, when the gear 21 rotates once and the notch 22 of the gear 21 comes to the position of the gear 24 again, the rotation of the gear 21 stops. When the gear 21 rotates once, the gear 25 integrally formed with the gear 21 also rotates once.

One rotation of the gear 25 causes a gear 26 that is meshed with the gear 25 and has twice the number of teeth of the gear 25 to rotate half a rotation. This half rotation of the gear 26 also causes the arm 32 fixed to the gear 26 to rotate half a rotation. By this half rotation of the arm 32, the gear 35 which is engaged with the gear 30 and has half the number of teeth of the gear 30 is rotated once with respect to the arm 32, and is engaged with the gear 35 and has the same number of teeth as the gear 35. Gear 36 is also rotated once. Therefore, the arm 37 fixed to this gear 36 also rotates once. When the gear 21 is started when the tape guide 3 is in the state shown in FIG.
In the state shown in Fig. 2, when the gear 21 rotates about 3/4 in the force direction of arrow B, the arm 32 rotates about 75 degrees as shown in Fig. 13, and the arm 37 rotates about 75 degrees with respect to this arm 32. do. As described above, the rotation angle of the arm 32 and the rotation angle of the arm 37 with respect to this arm 32 are equal, and the distance between the rotation fulcrum of the arm 32 and the rotation fulcrum of the arm 37 and the rotation fulcrum of the arm 37 are equal. Since the distance between the center of the pin 38 and the center of the pin 38 is equal, the pin 38 moves on a straight line due to the above-described rotation of the arms 32 and 37. By the linear movement of the pin 38, the roller holder 42 is moved along the guides 20a and 20b, and the housing 45 is brought into contact with the V-block 19.

In this contact state, the pin 38 is further moved,
This causes the spring 44 to expand and the housing 45 to be pressed against the V-block 19. This pressed state is shown in Figure 4.
As also shown in FIG. 5 or 10, the gear 21
The notch 22 has reached the position of the gear 24, and the tape guide 3 has fully pulled out the tape 5. Also, in this state, the arms 32 and 37 are not yet in a straight line;
Further, the pin 100 of the arm 97 is in contact with the stepped portion of the cam surface 101. Therefore, when the pin 100 comes into contact with the stepped portion, rotation of the gear 21 in the direction opposite to the arrow B is prevented, and therefore, the rotation of the arm 32 in the clockwise direction and the rotation of the arm 37 in the counterclockwise direction are prevented. Since the rotation of the pin 38 is prevented, the pin 38 will not be moved in the opposite direction to the direction in which it was previously moved. In this way, when the tape guide 3 is in the position shown in FIG. 4, the pin 38 is prevented from moving in the opposite direction, so even if the tape tension is large, the spring 44 is sufficiently strong. , the tape guide 3 is never moved away from the V plotter 19.

Next, when the plunger 93 is momentarily energized again,
The gear 21 makes one rotation, but this one rotation causes the gear 26
Then, the arms 32, 37, etc. are rotated in the same direction as in the previous case, and the tape guide 3 returns from the position shown in FIG. 4 to the position shown in FIG. 3.

As the tape guide 3 moves from the position shown in FIG. 3 to the position shown in FIG. 4, the cam 31 fixed to the gear 26
changes from the state shown in FIG. 11 to the state shown in FIG. 5, the pinch rollers 10a and 10b approach the capstans 4a and 4b, and the tension arms 14a and 14b apply tension to the tape 5 by their springs as shown in FIG. It will be in a state where it will be granted.

In the state shown in FIG. 4, when the plunger 75 is excited, the arm 17b is pulled via the link 74, arm 71, spring 70 and arm 60, the pinch roller 10b presses the tape 5 against the capstan 4b, and the tape 5 is run at a constant speed in the direction of arrow C in FIG. 4, and the tape 5 is wound onto the reel 2a as is well known. At this time, head group 6
b is in operation, and recording to or playback from tape 5 takes place in a known manner. Regarding the pinch roller 10a1 and the tension arm 14a, the tape 5 is pressed against the capstan 4a by the pinch roller 10a due to the excitation of the other plunger similar to the plunger 75, and the tape 5 is moved in the direction opposite to the arrow C. It is run and wound onto a reel 2b as is well known. At this time, the magnetic head group 6a is in operation. In the above embodiment, the present invention is applied to a tape recorder in which the tape 5 is selectively pressed against the capstans 4a, 4b that rotate in different directions using the pinch rollers 10a, 10b. The present invention can also be applied to a so-called double capstan closed loop type tape recorder in which the tape is pressed against the capstan by a pinch roller. As described above, the present invention includes the five drive gears 24 and the driven gear 21 that can mesh with the drive gears.
, a first arm 32 that is rotated by the rotation of the driven gear, and a second arm that is rotatably attached to the first arm.
arm 37 and the spring 44 due to the movement of the second arm.
A tape guide 3 driven through the tape guide 3, a guide receiver such as a V-block 19 that receives the tape guide at a predetermined position, a cam provided on the driven gear 21, and a cam surface 101 of the cam pressed against The driven gear 21 is provided with a notch 22 to avoid meshing with the driving gear 24, and the cam and the pressing member form a mechanism for preventing reverse rotation of the driven gear 21. The driven gear 21 is rotated by the driving gear 24, the first arm 32 is rotated by the rotation, and the second arm 37 is rotated by the spring 44. The tape guide 3 is pressed into contact with the guide receiver, and in this state, the notch of the first driven gear 21 reaches the drive gear 24, and the driven gear 2
1 is no longer driven, and the reverse rotation of the driven gear 21 is prevented by the cam and pressure contact member, and the urging force of the tape guide 3 by the second arm 37 via the spring 44 has not yet reached its maximum value. With this structure, the tape guide 3 pressed against the guide receiver can be reliably locked in this pressed state.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional example, Fig. 2 is a block diagram used to explain the present invention, Figs. 3 to 13 do not show embodiments of the present invention, and Figs. The figures are plan views showing different operating states, Fig. 5 is a plan view showing the inside, Fig. 6 is a side view of the main parts, Fig. 7 is a plan view of the main parts, Fig. 8 is a front view of the main parts, FIG. 9 is a partial side view, FIGS. 10 and 11 are plan views showing the interior, and FIGS. 12 and 13 are plan views showing the main parts in different operating states.

Claims (1)

[Claims] 1. A driving gear, a driven gear that can mesh with the driving gear, a first arm that is rotated by rotation of the driven gear, and a second arm that is rotatably attached to the first arm. an arm, a tape guide driven via a spring by the movement of the second arm, a guide receiver that receives the tape guide at a predetermined position, a cam provided on the driven gear, and a cam of the cam. a pressure contact member pressed against a cam surface, the driven gear is provided with a notch to prevent meshing with the drive gear, and the cam and the pressure contact member constitute a mechanism for preventing reverse rotation of the driven gear; The drive gear rotates the driven gear, the rotation causes the first arm to rotate, and the rotation causes the second arm to press the tape guide against the guide receiver via the spring. In this state, the notch in the driven gear reaches the drive gear, and the driven gear is no longer driven, and the cam and pressure contact member prevent the driven gear from rotating in the opposite direction, and the second arm rotates the driven gear via the spring. A locking device for a movable tape guide in a tape recorder, characterized in that the biasing force of the tape guide is configured so as not to reach a maximum value yet.