JPS5944710B2 - tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder that uses the rotational force of a motor to switch operations, and particularly to a switching mechanism for a recording/playback switch.

In a typical tape recorder, the tape running system is in the same state during recording and playback, and only the electric circuit is switched to the recording side or the playback side by a recording/playback switch. Circuits that can be used in common during recording and playback, such as audio amplification circuits, are used by switching their input and output, or by switching the terminal connection of one head for use in recording and playback. This type of tape recorder uses a recording/playback switch that can switch between 7 to 9 circuits for monaural and 14 to 18 circuits for stereo.
For example, if a switch is used to switch 18 circuits, the force required for the switching operation is 2 to 2 strokes.
This is a large force when compared with 700 to 1500 V assuming 3 mm. On the other hand, in recent years, so-called motor-drive tape recorders have appeared, which use the rotational force of a motor to switch the operation of the tape recorder.

Although these devices reduce the operating force required to operate the operation buttons, just switching between recording and playback as mentioned above requires a large amount of force, so each motor rotational force transmission mechanism is dedicated to playback, fast-forwarding, rewinding, stopping, pausing, and recording. As a result, the number of parts increases, which increases cost and has poor reliability. The present invention solves these problems and provides a motor drive operated tape recorder that is inexpensive, highly reliable, and has a recording/playback switching mechanism that requires less operating force. An embodiment of the present invention will be described below with reference to the drawings.

First, FIG. 1 shows the entire device of this embodiment. In front of the main board 1, there are a recording rod 2, a rewind rod 3, a fast forward rod 4, a stop rod 5, and a play rod 6. A pair of shafts installed on the substrate 1 are provided so as to be slidable in the direction of the arrow AB, and each of these rods is always moved in the direction of the arrow B by tension springs 7 to 11 suspended between them and the main substrate. is being energized.

Further, on the right side of the regeneration rod 6, there is a shaft 12 on the main board 1.
A three-branched pause lever 13 is provided which is rotatable around the center. This temporary stop lever 13 is normally positioned by having one branch 13a pressed against a stopper pin 14 on the main board 1 by one slope of a bent portion 15a of a leaf spring 15. When the branch 13a is rotated in the direction of arrow C against the spring 1
The device is positioned by being pressed by the other slope of the bent portion 15a of No. 5, and the device is brought into a temporary stop state. Furthermore, shafts 16 and 17 are installed on the left and right behind the main board 1, and a supply reel stand 18 and a take-up reel stand 19 are rotatably attached to these shafts 16 and 17. On the left side of the reel stand 18, a recording interlocking rod 20 is slidable in the direction of the arrow AB, rotatable around a guide shaft at the front end of the rod, and constantly supported by a tension spring 21 suspended between it and the main board 1. A recording/reproduction changeover switch 22 is provided which is biased in the direction of arrow B and is operated by the recording interlocking rod 20.

At the center of the main board 1 is a shaft 23, 2 installed on the main board 1.
4 and 25, a head substrate 26 is provided so as to be slidable in the direction of arrow AB.

This head board 26 is constantly biased in the direction of arrow B by a tension spring 27 suspended between it and the main board 1. Furthermore, an erasing head 28 and a recording/reproducing head 29 are mounted on the head board 26, and a pinch roller arm 31 is rotatably mounted on a shaft 30. A pinch roller 33 is rotatably attached to the pinch roller arm 31 via a shaft 32, and a part of the pinch roller arm 31 is attached to the head substrate 26 by a tension spring 34 suspended between the pinch roller arm 31 and the head substrate 26. The arm 31 is in contact with the upper stopper pin 35.
is biased to rotate clockwise. Pinch roller 3 above
A cab stan 36 is rotatably provided on the main board 1 opposite to the main board 3.

This capstan 36 is integrally equipped with a reel drive pulley 3.
7 is provided, and an idler 38 that transmits the rotational force of this pulley 37 to the take-up reel stand 19 is provided with an idler lever 3.
A shaft 40 is also rotatably provided at one end of the shaft 9.
The idler lever 39 is rotatably and slidably mounted on a shaft 41 on the main board 1, and a tension spring 42 suspended between the idler lever 39 and the main board 1 causes the idler 38 to move around the pulley 37 of the capstan 36. Outer periphery and take-up reel stand 19
the first
In the stopped state shown in the figure, the shaft 40 of the pinch roller 38 rides on the step 43a of the locking hole 43 of the head board 26, preventing the idler 38 from coming into contact with the outer periphery of the take-up reel stand 19. The above is a general description of the overall configuration shown in FIG. 1. When the head board 26 shown in FIG. 1 is removed, the operation switching mechanism appears as shown in FIG. 2. The major feature of this operation switching mechanism is that it moves the head board 26 forward and backward using the rotational force of a motor (not shown), and is particularly unique in its reproduction operation mechanism. First, the configuration and operation of this reproducing operation mechanism will be explained with reference to FIG.

As mentioned above, the drive source for this regeneration operation mechanism is the rotational force of a motor (not shown), but specifically, the rotational force of the capstan 36, which is rotated at a substantially constant speed by the force of the motor. That is, the capstan 36 is integrally provided with a drive gear 44 located on the back side of the main board 1, and the main board 1 is located on the back side of the main board 1 and on the left and right front of the drive gear 44, respectively. A main gear 47 and a sub gear 48 are provided to be rotatable about upper shafts 45 and 46. The main gear 47 is provided with a toothless portion 47a by removing some of the teeth provided on its outer periphery, and this toothless portion 47a is normally opposed to the drive gear 44. On the other hand, the auxiliary gear 48 is provided with toothless parts 48a and 48b by removing part of the teeth provided on its outer periphery at two opposing locations, and normally one of these two toothless parts 48a and 48b is provided. 48a
is opposed to the drive gear 44. The main gear 47 is for moving the head board 26 forward and backward to a temporarily stopped position, and the auxiliary gear 48 is for moving the head from this temporarily stopped position to a position where the pinch roller 33 is pressed against the capstan 36. This is for moving the substrate 26 forward and backward. First, the main gear 47 and its related parts will be explained. The main gear 47 has two cam grooves 49 and 50 on the inside and outside.
A pin 51 is engaged with the peripheral wall of 9.

As clearly shown in FIG.
3 and is engaged with a cam groove 49 of the main gear 47.
The main actuating lever 52 has a corner thereof attached to a shaft 54 on the main board 1.
It is rotatably supported by the main board 1 and biased clockwise by a tension spring 55 suspended between the other end and the main board 1. The biasing force of the tension spring 55 becomes a force that presses the pin 51 against the peripheral wall of the cam groove 49 of the main gear 47, and as shown in FIG.
If the main gear shaft 47 is located on the inclined surface 49a of 5
6, the stopper pin 57 comes into contact with the main gear 4.
7 and the pin 51 is maintained in the state shown in FIG.

The stopper pin 57 is provided on a first control lever 59 which is rotatable about a shaft 58 set on the upper surface of the main board 1. As shown in FIG. The main gear 47 is engaged with the end surface 56 of the main gear 47 via the gear 60. As is clear from FIG. 2, this first control lever 59 pushes a play button (not shown)
is rotated counterclockwise by sliding it in the direction of arrow A and pressing the right end of the lever 59 with its tip protrusion 6a, and by pressing a stop button (not shown) and sliding the stop rod 5 in the direction of arrow A. By pressing the left end of the lever 59 with the tip projection 5a, the lever 59 is rotated clockwise.

That is, when the play button is pressed, the stopper pin 57 enters the entrance of the cam groove 50 of the main gear 47, as shown in FIG. 3, so that the main gear 47 can rotate. Due to the rotation of the main gear 47, the main operating lever 52 is rotated counterclockwise because the pin 51 is engaged with the cam groove 49, but the rotational force of the main operating lever 52 is transferred to the head board. The following configuration is adopted for use in the forward movement of 26.

That is, there is a bent piece 52a on the front edge of the right end of the main operating lever 52.
A pin 62 provided at one end of the sub-operating lever 61 is engaged with this bent piece 52a. The other end of the sub-operating lever 61 is rotatably connected to one end of an inverted L-shaped toggle lever 64 by a shaft 63.
The corner of this inverted L-shaped toggle lever 64 is connected to the main board 1.
It is rotatably attached to a shaft 65 provided above, and a torsion spring toggle spring 66 is attached between the other end of the lever 64 and the main board 1 with both ends thereof rotatably attached. . A head board drive pin 67 is installed approximately in the center of the sub-operation lever 61, and this pin 67 is connected to the first
As shown in the figure, it is inserted into and engaged with the square hole 68 of the head board 26. With this configuration, when the main operating lever 52 rotates counterclockwise due to the rotation of the main gear 47, the pin 62 is pushed up in the direction of arrow A by the bent piece 52a, and the auxiliary operating lever 61 rotates around the shaft 63, and the pin 67 of this sub-operating lever 61 also rotates the head board 26.
can be moved forward to a paused position.

This forward movement of the head board 26 is carried out after the main gear 47 starts rotating, and the missing toothed portion 47a of the main gear 47 is connected to the drive gear 44.
The rotation continues until it faces again and stops rotating.

When the main gear 47 stops rotating, it is repositioned. That is, as shown in FIG.
7 is in contact with the outlet of the cam groove 50 of the main gear 47, that is, the stepped surface 69 of the inner peripheral wall, and the pin 51 on the main operating lever 52
is the second inclined surface 49b of the peripheral wall of the cam groove 49 of the main gear 47
located in At this time, as mentioned earlier, the tension spring 55
With this force, the pin 51 presses the peripheral wall of the cam groove 49 and the main gear 47
Although the main gear 47 is rotated clockwise, the main gear 47 is held in the position shown in FIG. 4 due to the engagement between the pin 57 and the stepped surface 69, and the head board 26 is at the temporary stop position, that is, when the head is on the magnetic tape. The pinch roller 33 is held at a position slightly apart from the capstan 36. In order to further move the head board 26, which has been advanced to the temporary stop position, to the performance position, that is, to the position where the head contacts the tape and the pinch roller 33 is pressed against the capstan 36, the auxiliary gear 4 is rotated.
8 comes into play.

That is, this secondary gear 48 has a cam groove 70, into which the rotation support shaft 63 of the secondary operating lever 61 shown in FIG. 2 is inserted and engaged via the long hole 71 of the main board 1. has been done.

Two pins 72 and 73 are provided on the back surface of the auxiliary gear 48 at equal distances and symmetrical positions from the rotation support shaft 46 of the gear 48. The other end of a leaf spring 74, one end of which is fixed on the main board 1, is pressed against one of these pins 73 and urges the secondary gear 48 to rotate clockwise, but this urging force is A pin 76 planted on one branch of the second control lever 75 is pressed against a notch 77 provided in the peripheral wall of the secondary gear 48 to prevent rotation of the secondary gear 48. It is held in the position shown. The second control lever 7
5 is rotatably provided on a shaft 78 on the main board 1,
A tension spring 79 is suspended between one of the branches and the main board 1 to separate the pin 76 from the notch 77 and make the secondary gear 48 rotatable.
As shown in FIG. 1, a pin 80 provided on the other branch of the head board 26 is held in position by engaging with a step 81a of a hole 81 of the head board 26.

However, when the head board 26 is moved in the direction of arrow A with the rotation of the main gear 47 mentioned above, the pin 80 separates from the step 81a of the hole 81 of the head board 26, and the tension spring 79
The pin 76 of the second control lever 75 separates from the notch 77 of the secondary gear 48 and allows the secondary gear 48 to rotate.

The rotation of the auxiliary gear 48 pushes the pivot shaft 63 of the auxiliary operating lever 61 in the direction of arrow A, and the auxiliary operating lever 61 rotates counterclockwise about the pin 62 planted at its end. As a result, the head board 26 moves forward in the direction of arrow A via the head board drive pin 67, and the head board 26 moves forward in the direction of arrow A.
is brought to the playing position. This forward movement of the head board 26 continues from when the sub gear 48 starts rotating until the toothless portion 48b of the gear 48 opposes the drive gear 44 and stops rotating.

When the secondary gear 48 stops rotating, it is repositioned. That is, as shown in FIG. 4, the pin 76 provided on the second control lever 75 comes into contact with the protrusion 82 (see also FIG. 5) provided at the end of the toothless portion 48a of the secondary gear 48, and the leaf spring The free end of 74 is pressed against the pin 72 of the auxiliary gear 48 . At this time, as described above, the secondary gear 48 is urged to rotate clockwise, but the engagement between the pin 76 and the protrusion 82 causes the secondary gear 48 to be held in position as shown in FIG. . The above is a general explanation of the configuration of the playback mechanism and the operation of each part.
Here, the flow of the operation of this mechanism accompanying the playback operation will be explained step by step.

First, when the playback button is lightly pressed, the playback rod 6 is pushed in the direction of arrow A and the first control lever 59 is rotated counterclockwise.

This causes the pin 57 of the first control lever 59 to
7 is disengaged from the end surface 56 of the outer peripheral wall and enters the starting end of the cam groove 50. Along with this, as mentioned earlier, the force of the tension spring 55 acting on the main gear 47 via the pin 51 of the main operating lever 52 causes the gear 47 to slightly rotate clockwise, causing the main gear 47 to rotate to the drive gear. 44. At this time, the drive gear 44 is connected to a motor (not shown) with a belt and is rotated counterclockwise at a substantially constant speed.
The main gear 47 starts rotating clockwise. This rotation causes the pin 51 to move in the direction of arrow A along the peripheral wall of the cam groove 49, and the movement of the pin 51 causes the main operating lever 52 to rotate counterclockwise about the support shaft 54. At the same time, the auxiliary operating lever 61 is also rotated clockwise about the shaft 63 via the bent piece 52a of the main operating lever 52 and the pin 62. The rotation of the sub-operating lever 61 causes the head board drive pin 67 to move in the direction of arrow A, causing the head board 26 to move.
is moved forward. By this forward movement of the head replate 26, the engagement between the stepped portion 81a of the hole 81 of the head substrate 26 shown in FIG. 1 and the pin 80 of the second control lever 75 is released.

This is done when the main gear 47 has completed approximately half a revolution. When the pin 80 separates from the stepped portion 81a, the second control lever 75 is rotated clockwise about the shaft 78 by the force of the tension spring 79. As a result, the pin 76 of the second control lever 75 comes out of the notch 77 of the secondary gear 48, and as mentioned above, the secondary gear 48 is slightly rotated clockwise by the pressing force of the leaf spring 74, and A gear 48 meshes with drive gear 44 . Then, the auxiliary gear 48 starts rotating clockwise in response to the rotational force of the drive gear 44. The rotation of the auxiliary gear 48 causes the support shaft 63 of the auxiliary operating lever 61 to move in the direction of arrow A along the cam groove 70, but at the beginning of this movement, the rotation of the main gear 47 ends, as shown in FIG. As shown in FIG. 6, the main gear 47 is positioned by the engagement between the pin 57 of the first control lever 59 and the step surface 69, and the main operating lever 52 is also held in position (see FIG. 6). Therefore, as the shaft 63 moves in the direction of arrow A, the sub-operating lever 61 rotates counterclockwise about the pin 62 at its end, and this rotational force is transmitted to the head board via the head board drive pin 67. 26, the head board 26 is further moved forward and brought to the performance position. At this time, the toggle lever 64 and toggle spring 66 also rotate, and the toggle lever 64 is held at the position shown in FIG. 7.
(See FIG. 7) When the forward movement of the head board 26 is completed, the auxiliary gear 48 is also positioned as its protrusion 82 engages with the pin 76 of the second control lever 75, as shown in FIG.
The head board 26 is thus held at the playing position.

Further, as the head board 26 moves, the idler 38 is released from the head board 26 in FIG. Since they are in pressure contact with each other, the take-up reel stand 19 is rotated counterclockwise to take up the magnetic tape (force set tape) fed out at a constant speed by the capstan 36 and pinch roller 33, and a reproducing operation is performed. The operations (playback operations) up to this point can be summarized as follows.

(1) When the playback button is pressed, the main gear 47 meshes with the drive gear 44 and starts rotating.

(2) The rotation of the main gear 47 moves the head board 26 forward toward the temporary stop position.

(3) As the head board 26 moves forward, the auxiliary gear 48 meshes with the drive gear 44 and starts rotating.

(4) The rotation of the auxiliary gear 48 moves the head board 26 forward to the performance position, and the apparatus enters the playback operation state. The above is a description of the transition of the apparatus from the stopped state to the reproduction state, in other words, the tape constant speed running state.Next, the operation of shifting the tape constant speed running state to the stopped state, that is, the stopping operation will be explained.

When a stop button (not shown) is lightly pressed, the stop rod 5 is pushed in the direction of arrow A, and as shown in FIG.
is rotated clockwise.

As a result, the pin 57 of the first control lever 59 and the main gear 4
7 is disengaged from the step surface 69. Along with this, as mentioned earlier, the main gear 4 is
The force of the tension spring 55 acting on the gear 4
7 is rotated clockwise and returned to the original position shown in FIG. Accordingly, the pin 51 moves in the direction of arrow B, and the main operating lever 52 also rotates back to its original position as shown in FIG. As the main operating lever 52 returns, the auxiliary operating lever 61 rotates counterclockwise about the shaft 63, and the head base plate 26 is moved backward in the direction of arrow B. In the process of the backward movement of the head board 26, the head board 2 shown in FIG.
The pin 80 rides on the step 81a of the hole 81 of No. 6, and as a result, the second control lever 75 is rotated counterclockwise from the position shown in FIG.
8 is disengaged from the protrusion 82. As a result, the secondary gear 48 is slightly rotated clockwise by the force of the leaf spring 74.
The auxiliary gear 48 meshes with the drive gear 44 and starts rotating clockwise. When this sub-gear 48 rotates half a turn again and returns to the position shown in FIG. 3, the support shaft 63 of the sub-operating lever 61 also returns to its original position shown in FIG. 2, and the device comes to a halt. It goes without saying that at this time, the toggle lever 64 and toggle spring 66 are also returned from the position shown in FIG. 7 to the position shown in FIG. 2. This toggle mechanism moves the support shaft 63 of the sub-operating lever 61 and the head board 26.
This mechanism is provided to ensure the movement of the device, and the device can operate even without this mechanism. Operation so far (stopping operation)
The following is a summary.

(1) When the stop button is pressed, the main gear 47 rotates back to its original position, and the head board 26 is also moved backward.

(2) During the backward movement process of the head board 26, the auxiliary gear 48
is meshed with the drive gear 44 and starts rotating. (3) The rotation of the auxiliary gear 48 causes the auxiliary operating lever 61 to move back to its original position, bringing the device to a stopped state. By the way, the recording operation is closely related to the playback operation described above. That is, in this embodiment as well, the recording operation is performed by operating both the record button and the playback button. A feature of the recording operation of this embodiment is that the switching force for the recording/playback switch is obtained from the capsmen drive motor, thereby greatly reducing the operating force for the recording button. Next, the configuration and operation of this recording operation will be explained using FIGS. 2, 8, and 9.

First, in FIG. 2, the recording interlocking rod 20 is connected to a guide shaft 83 planted on the main board 1 and a shaft 84 provided at the tip of the operating shaft 22a (slidable in the direction of arrow EF) of the recording/playback switch 22. It is slidable in the direction of arrow AB, and is also rotatable about the guide shaft 83 as a support shaft. Note that since the operating shaft 22a is biased in the direction of arrow D by the tension spring 85, the shaft 84 is normally held at the position shown in FIG. At this position, press the recording/playback switch 2.
2 has been switched to the playback side. Further, a pin 86 is installed on the lower surface of the recording interlocking rod 20 at the approximate center thereof, and the main operating lever 52 is configured to be able to engage with this pin 86.
A small notch 87 and a large notch 88 are provided at the other end. The operation of this configuration will be explained next.

When recording, first press the recording button, move the recording rod 2 in the direction of arrow A, and press the tip protrusion 2a of the rod 2.
The recording interlocking rod 20 is also pushed in the direction of arrow A. At this time, the pin 86 of the recording interlock rod 20 is connected to the main operating lever 5.
It is brought to the left of the small notch 87 of No. 2. And this Q
state (with the record button pressed), press the play button and rotate the main operating lever 52 counterclockwise, the tip 5
The small notch 87 of 2a engages with the pin 86 of the recording interlocking rod 20 and pushes this pin 86. Along with this, the 8th
As shown in the figure, the recording interlocking rod 20 is rotated counterclockwise around the guide shaft 83 to switch the recording/playback selector switch 22.
The operating shaft 22a is pulled out against the force of the spring 85, and the switch 22 is switched to the recording side. When the playback button is pressed, the tape is moved to a constant speed running state by the capstan and pinch roller, as described above, and the apparatus enters a so-called recording operation state. To record in this way, all you have to do is press the record button and then press the play button.

On the other hand, if you press the playback button and then press the record button, you will not be able to record. This is to prevent these operations from occurring as much as possible, and to ensure that even if you accidentally press the record button during playback, the device will not enter the recording mode and you will be able to recognize that the recording operation is impossible. That is, when the main operating lever 52 is rotated counterclockwise by operating the playback button as shown in FIG. Therefore, even if the recording button is pressed and the recording interlocking rod 20 is attempted to move, the pin 86 is engaged with the large notch 88 and the movement is blocked, preventing the recording operation and the switching of the recording/playback switch 22. The recording operation up to this point can be summarized as follows.

(1) Press the record button and then press the play button.
When the main operating lever 52 rotates counterclockwise, the small notch 87 pushes the pin 86, causing the recording interlocking rod 20 to rotate counterclockwise around the guide shaft 83, causing the recording/playback switch 22 to switch to recording. When the tape is switched to the side and the tape is run at a constant speed, it enters the recording operation state.

(2) Even if an attempt is made to press the record button after pressing the playback button, the pin 86 of the recording interlocking rod 20 engages with the large notch 88 of the main operating lever 52 and does not move, making it impossible to record.

As explained above, according to the tape recorder of the present invention, it is possible to provide a tape recorder having a switching mechanism for a recording/playback switch that has a small number of parts, is inexpensive, highly reliable, and has a light operating force. It is highly practical.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a tape recorder according to an embodiment of the present invention, FIG. 2 is a plan view showing an operation switching mechanism of the tape recorder, and FIGS. 3 and 4 are diagrams for explaining the operation switching mechanism. A plan view, FIG. 5 is a cross-sectional view taken along the line D-D in FIG. 3 of the secondary gear constituting the mechanism, and FIGS. 6 and 7 explain the movements of the head board and pinch rollers related to the operation of the mechanism. FIGS. 8 and 9 are plan views for explaining the recording switching mechanism. 2... Recording rod, 6... Playback rod, 20... Volume interlocking rod, 22... Recording/playback selector switch, 26... Head board, 3
3... Pinch roller, 36... Capstan, 44... Drive gear, 47...
Main gear, 48... Sub-gear, 52... Main operating lever, 61... Sub-activating lever.

Claims (1)

[Scope of Claims] 1. A recording interlocking member that slides in one direction in conjunction with the operation of a recording button, and a recording/playback switch connected to this member and switched to the recording side by rotating the member. and a rotating body that is driven by receiving the rotational force of a motor when a playback button is operated, and an operating member that is rotated by the rotation of this rotating body and moves the head board, and the recording interlocking member and the operating member are mutually connected. The tape recorder is configured such that when both a record button and a playback button are operated, a recording interlocking rod is rotated by rotation of an operating member and a recording/playback selector switch is switched to the recording side. 2. The tape recorder according to claim 1, wherein the recording interlocking member is prevented from moving by the operating member when the recording button is operated after the playback button is operated.