JPH0685202B2 - Tape recorder - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape recorder capable of reciprocal recording and reproduction using a motor and a cam for switching operation modes.

Configuration of conventional example and its problems In recent years, so-called plunger drive in which the operation mode of the tape recorder mechanism is switched, and the head substrate or forward / reverse (abbreviated as positive and negative) switching mechanism is driven directly by the plunger, pinch roller, etc. Since then, it is being changed to a cam drive type which drives the above-mentioned components by a cam connected to a motor. Even in the cam drive type, the mechanism that intermittently meshes the cam gear with the constantly rotating drive gear drives the mechanism, and the mechanism drive motor is always connected to turn the drive motor on and off. Some drive the mechanism. By the way, a tape recorder capable of reciprocal recording and reproduction is usually provided with a pinch roller for forward rotation and a pinch roller for reversal, and each is configured to independently operate in normal and reverse directions. Further, since the head also needs to be moved forward and backward, a minimum of two or more cams is required just by operating the above components.
In addition to the above, the unnecessary erasing head is retracted in the opposite direction, the azimuth can be adjusted independently in the opposite direction,
In a mechanism provided with an operation for improving performance such as the head not moving during play and pose (details will be described later in the description of the present invention), the number of cams needs to be substantially the same as the number of movable members. In the case of the above tape recorder, the number of cams has always been 3 to 5. This is contrary to thinning and miniaturization, and as the number of cams increases, more space is required and the mechanism is naturally complicated.

It is an object of the present invention to solve the above-mentioned conventional drawbacks, and to provide a tape recorder which can be reciprocally recorded and played back and which can be thinned, downsized, and simplified while having a mechanism structure for realizing high performance. The purpose is to do.

In order to achieve the above object, the tape recorder of the present invention,
A first cam and a first cam controlled by the first cam
Pinch roller, a second cam rotating in synchronization with or integrally with the first cam, a second lever controlled by the second cam, and a second lever controlled by the second lever. A second pinch roller is provided, and forward / backward movement of a head substrate on which a head or the like is mounted is controlled by the first lever, and a member that is in different states such as azimuth or erase head switching is controlled by forward rotation and reverse rotation. The control plate is configured to be controlled by the second lever.

Description of Embodiments An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the stopped state, and the mechanical substrate 1
And cassette 2 are indicated by a chain double-dashed line. A left main gear 4 is rotatably supported by a left main gear shaft 3 that is planted on the lower surface (back side of the drawing) of the mechanical substrate 1. The left sub-lever 6 is rotatably supported on the left sub-lever shaft 5 that is erected on the lower surface of the mechanical substrate 1. The pin 7 that is erected on the lower surface of the left sub-lever 6 is provided on the upper surface of the left main gear 4. It is engaged with the first cam groove portion 4a. That is, the left sub-lever 6 is arranged closer to the mechanical board 1 than the left main gear 4. The first lever 8 is rotatably supported by a first lever shaft 9 that is erected on the upper surface of the mechanical substrate 1. Pins 10 that are erected on the lower surface of the first lever 8 are on the mechanical substrate 1. It penetrates through a long hole (not shown) and engages with the long hole portion 6a of the left sub-lever 6. The right main gear 11, the right sub-lever 12, and the second lever 13 on the right side are configured similarly to the left main gear 4, the left sub-lever 6, and the first lever 8. That is, the right main gear shaft 14 and the right sub-lever shaft 15 are erected on the lower surface of the mechanical substrate 1, the right main gear 11 and the right sub-lever 12 are rotatably supported on the lower surface of the mechanical sub-board 1, and the pin 16 erected on the lower surface of the right sub-lever 12 is rotatably supported. Is a second provided on the upper surface of the right main gear 11.
Is engaged with the cam groove portion 11a. The second lever 13 is rotatably supported by the second lever shaft 17 that is erected on the upper surface of the mechanical substrate 1, and the pins 18 that are erected on the lower surface of the second lever 13 are It penetrates a long hole (not shown) and engages with the long hole portion 12a of the right sub-lever 12. The pin 10,
Although 18 penetrates the long hole of the mechanical substrate 1, the long hole of the mechanical substrate 1 is formed so as to sufficiently include the movement loci of the pins 10 and 18, and the movement of the pins 10 and 18 is not hindered. Absent. The left main gear 4 and the right main gear 11 are meshed with the same number of teeth, and are configured to rotate in synchronization. The head substrate 19 is held on the mechanical substrate 1 by a steel ball (not shown), and is configured so that it can move forward and backward (vertical direction in the figure) with little frictional resistance. A spring 21 is externally fitted to a boss 20 that is set up on the head substrate 19, and one end of the head substrate 19
It is locked to a pin 22 which is planted on the head substrate 19, and the other end is locked to a pin 23 which is also planted on the head substrate 19. The tip portion 21a of the spring 21 is clamped by the bus portions 8a and 8b of the first lever 8, and the first lever 8 is
When it is rotated counterclockwise about the lever shaft 9 of the
The head substrate 19 is advanced through the spring 21 sandwiched by the boss portions 8a and 8b of the lever 8 of FIG. 1, but when advanced to the play position, the head substrate 19 is stopped by the stopper (not shown), and the first substrate is stopped. Even if the lever 8 of is rotated further, the spring 21
A gap is created between the pin 23 and the pin 23 to absorb the overstroke. The control plate 24 is slidably held in the front-rear direction (vertical direction in the drawing) similarly to the head substrate 19, and is arranged between the mechanical substrate 1 and the head substrate 19 in the height direction. In this embodiment, the head substrate 19 is arranged so as to be in contact with the lower side thereof. Figure 10 shows the relationship in the height direction. The recess 24a of the control plate 24 is the second lever 1
The control plate 24 is moved forward and backward by engaging with the boss portion 13a of 3 and pivoting the second lever 13 about the second lever shaft 17. The second pinch roller 25 for forward rotation and the first pinch roller 26 for reversal are rotatably supported by a second pinch lever 27 and a first pinch lever 28, respectively.
The pinch lever 27 and the first pinch lever 28 of the mechanical board 1
It is rotatably supported by shafts 29 and 30 that are planted in the. FIG. 4 shows a state in which a spring 31 is fitted on the shaft 29 of the second pinch lever 27. One end of the spring 31 is the second pinch lever
27 is locked by the boss portion 27a, the other end is also locked by the boss portion 27b, and the tip end portion 31a is the second one.
The lever 13 is clamped by boss portions 13b and 13c. That is, the second pinch lever 27 is rotated by the rotation of the second lever 13, but when the second pinch roller 25 is pressed against the forward rotation capstan 32, the second pinch lever 27 is forced. Be stopped. At this time, the spring 31 and the boss portion 27b of the second pinch lever 27 are separated from each other to generate a pin pressure. Since the same applies to the first pinch lever 28, the details are omitted. The capstan 33 and the capstan 32 are pivotally supported by bearings 34 and 35, respectively. The erasing head base 36 has its boss portion 36a fitted into the hole portion 19a of the head substrate 19, and is rotatably held by a leaf spring 37 attached to the head substrate 19. The erasing head base 36 is biased by a spring 38 so as to rotate clockwise. This spring 38 is the erase head base.
The hole 36b of 36 and the notch 19b of the head substrate 19 are hooked. The erasing head base 36 has a boss portion 36c on the lower surface, and the boss portion 36c reaches the control plate 24 through the escape hole 19c (FIG. 10) in the head substrate 19 and reaches the cam portion 24b of the control plate 24. Abutting. Forward erasing head 39, Reverse erasing head 40
Is provided on the erasing head base 36. 5 and 6 show the recording / reproducing head 41 and its peripheral portion. The recording / playback head 41 is fixed to the head seat 42. The head seat 42 is fixed to the head substrate 19 by screws 43 and 44 via a coil spring (not shown) fitted onto the screws 43 and 44. That is, the height of the head seat 42 can be stably changed by adjusting the screws 43 and 44. The right side of the head seat 42 is processed into a shape, and notches 42a, 42a,
The shaft portions 45a and 45b of the roller 45 are held by 43b. Control board 24
Azimuth plate 4 on the azimuth bosses 46 and 47 planted in
8 is fixed by screws 49 and 50. The outer shape of the azimuth plate 51 is substantially the same as that of the azimuth plate 48. The azimuth plate 51 is guided by the azimuth bosses 46 and 47, and is configured to be slidable in the axial direction of the azimuth bosses 46 and 47. Head pins 52 are erected on the head substrate 19 and are fitted in the holes 42c of the head seat 42. Also, a coil spring (not shown) externally fitted to the head pin 52 is
Since it is located between 19 and the head seat 42, the side of the head seat 42 that holds the roller 45 is urged to be pushed up. That is, the roller 45 is in contact with the azimuth plate 51. Azimuth screws 53 and 54 are screwed into the azimuth plate 48 and are in contact with the azimuth plate 51. The contact position is the roller 45 and the azimuth plate.
It is configured to be at the same point as the abutting position of 51 in plan view. Figure 6 shows the case of normal play, azimuth screw 53
Is located directly above the roller 45, and in the case of reversing play, the azimuth screw 54 is located directly above the roller 45 (details will be described later).

The structure of the drive unit of the mechanism will be described. FIG. 7 is a perspective view around the right main gear 11 and the mechanism driving motor 55. The right main gear 11 is meshed with the relay gear 56, and the relay gear 56 and the worm wheel 57 are integrally fixed to the shaft 58 and rotatably held on the mechanical substrate 1. The worm wheel 57 meshes with a worm 60 fixed to a shaft 59 of the motor 55. On the other hand, a mode sensor 61 made of a conductive material is integrally fixed to the lower surface of the right main gear 11. FIG. 8 is a sectional view of the right main gear 11 and its peripheral portion. Both ends of the mode sensor 61 are bent, and the tips thereof are in pressure contact with the mode board 6. An island-shaped circuit pattern is provided on the upper surface of the mode board 62, and the mode sensor 61 short-circuits this circuit pattern to extract it as an electric signal, thereby stopping the right main gear 11 at the stop position (normal play, reverse play, stop). Etc.) can be detected.

Next, the operation of the present invention will be described. If, for example, a normal rotation play command is input from the stop state, the microcomputer 55 makes a judgment to issue a normal rotation or reverse rotation command, and the motor 55 immediately rotates. Right main gear 11 via worm 60, worm wheel 57, relay gear 56
Rotates. At this time, needless to say, the left main gear 4 rotates in synchronization with the right main gear 11. Right main gear
The mode sensor 61 provided integrally with the 11 rotates, and the pressure contact portion with the mode board 62 slides on the mode board 62. When the right main gear 11 rotates to the normal play state, an electric command is sent to the microcomputer and the motor 55 immediately stops. Since this operation is the same when switching between the modes, the description thereof will be omitted. The stop positions of the right main gear 11 and the left main gear 4 are uniquely determined in each mode such as normal play, reverse play, and stop. Second and first cam groove portions of the right main gear 11 and the left main gear 4
The right and left sub-lever 12,6 are connected by 11a, 4a, and the second lever 13 and the first sub-lever by this right and left sub-lever 12,6.
The stop position of the lever 8 is uniquely determined. In the normal rotation play, as shown in FIG. 2, the second lever 13 is rotated in the maximum clockwise direction, and the first lever 8 is slightly counteracted when the head substrate 19 reaches the maximum forward position. Stop at the position where it is turned clockwise. As described in detail in the configuration, the overstroke at this time is absorbed by the space between the spring 21 and the pin 23. The second pinch roller 25 is in pressure contact with the forward rotation capstan 32. Control board 24 and head board 19
The relative position of is shown in FIG. 5, and the azimuth of the recording / reproducing head 41 can be adjusted with the azimuth screw 53. The first pinch roller 26 is separated from the reversing capstan 33. The boss portion 36c of the erasing head base 36 is in contact with the cam portion 24b of the control plate 24. At this time, the forward erasing head 39 enters the cassette 2 through the small window of the cassette 2. The reversing erasing head 40 also penetrates into the cassette 2, but does not affect the tape running.
This is shown in FIG.

Next, the forward rotation pose will be described. The forward rotation pose is a state in which the second lever 13 is slightly rotated counterclockwise from the forward rotation play state (not shown). Since the first lever 8 is at the same position as in the normal rotation play state, the position of the head substrate 19 does not change. That is, since the position of the recording / reproducing head 4 is the same in play and pause, it is difficult to record electrical noise on the tape. Although the control plate 24 is slightly retracted (downward in the drawing), since the cam portion 24b has a flat portion, the erasing head base 36 does not rotate and the erasing heads 39, 4 are not rotated.
0 does not move.

Next, the reverse play will be described. The state is shown in FIG. 3, and the first lever 8 is at the position where it is pivoted in the maximum counterclockwise direction. At this time, the first pinch roller 26 is in pressure contact with the reversing capstan 33, just as the second pinch roller 25 is in pressure contact with the normal rotation capstan 32 during normal rotation play. At this time, the pin 23 and the spring on the head substrate 19
Needless to say, it is further separated from 21 to absorb overstroke. The second lever 13 is an azimuth roller 45
The position of the control plate 24 is determined so that the azimuth screw 54 is located directly above. That is, at this time, the azimuth at the time of reversal can be adjusted by the azimuth screw 54. Further, the boss portion 36c of the erasing head base 36 is in contact with the cam portion 24c of the control plate 24, and the erasing head base 36 is slightly counterclockwise as compared with the case where the boss portion 36c is in contact with the cam portion 24b during normal rotation play. Turn to
The reverse erasing head 40 on the right side is the cassette 2 contrary to the normal rotation.
Then, the forward erasing head 39 retracts to a position where it does not affect the tape running.

Next, the reverse pose will be described. The reverse pose is different from the normal pose in the rotation position of the first lever 8 (not shown). That is, the first lever 8 is a position rotated to the normal play (or the same as the normal pose) position.
That is, the head substrate 19 is at the most advanced position, and the first pinch roller 26 and the reversing capstan 33 are separated from each other. Since the position of the second lever 13 is the same as that in the reverse play, the control plate 24 does not move and the erasing head base
The erasing heads 36 and 40 do not move due to the rotation of 36.

As described above, according to the present invention, the first cam and the first cam are provided.
A first lever controlled by the first cam, a first pinch roller controlled by the first lever, and a second cam that rotates in synchronization with or integrally with the first cam, A second lever controlled by a second cam and a second pinch roller controlled by the second lever are provided, and the forward and backward movement of a head substrate on which a head or the like is mounted is caused by the first lever. The control plate for controlling a member whose state is different, such as switching of the azimuth or the erasing head, is controlled by the second lever, which is controlled by the second lever. Without adjusting, the azimuth of the recording / playback head can be adjusted independently and independently,
It is possible to sufficiently enhance the performance of the tape recorder capable of reciprocal recording and reproduction, such as advancing only the erasing head that is necessary, and it is possible to realize extremely miniaturization, thinning, and simplification.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a plan view of a stopped state, FIG. 2 is a plan view of a normal rotation play state, FIG. 3 is a plan view of a reverse play state, and FIG. A plan view of the second pinch lever, FIG. 5 is a plan view of the recording / reproducing head peripheral portion, FIG. 6 is a side view of the recording / reproducing head peripheral portion, FIG. 7 is a plan view of the mechanism driving portion vicinity, and FIG. Is a cross-sectional view near the mode sensor, FIG. 9 is an explanatory diagram showing the relationship between the left and right erasing heads and the cassette, and FIG. 10 is a relationship in the height direction of the head substrate, the control plate, and the erasing head base (FIG. 1). FIG. 7 is a partial cross-sectional view of the first lever viewed from the side thereof. 1 ... Mechanical substrate, 2 ... Cassette, 4 ... Left main gear, 4a ... First cam groove, 6 ... Left sub-lever, 7 ...
… Pin, 8 …… First lever, 11 …… Right main gear, 11
a …… second cam groove, 12 …… right sub lever, 13 …… second lever, 16 …… pin, 19 …… head board, 24 …… control plate, 25 …… first pinch roller, 26 ...... First pinch roller, 27 …… Second pinch lever, 28 …… First pinch lever, 32 …… Forward rotation capstan, 33 …… Reversal capstan, 36 …… Erasing head base, 39 …… Forward rotation erasing head, 40 …… Reversing erasing head, 41 …… Recording and reproducing head, 45 …… Roller, 48,51 …… Azimuth plate.

Claims (1)

[Claims] 1. A first cam, a first lever that is rotatably controlled by the first cam, and a first pinch roller that is pressed against a capstan by the rotation of the first lever. A second cam that rotates in synchronization with or integrally with the first cam, a second lever that is rotatably controlled by the second cam, and a rotation of the second lever. A second pinch roller that is pressed against the capstan by motion, a head substrate on which a recording / reproducing head and an erasing head base are mounted, and a tip portion attached to the head substrate to move the head substrate forward and backward. The spring means attached to the end of the lever No. 1 and the forward erasing head are inserted into the cassette at the time of forward rotation, and the azimuth adjustment of the recording / playback head can be adjusted by the first azimuth adjusting means. And a control plate that moves forward and backward in the same manner as the head substrate so that the erasing head for reversal can enter the cassette and the azimuth adjustment of the recording / reproducing head can be adjusted by the second azimuth adjusting means. The tape recorder is characterized in that the head substrate is moved forward and backward by rotating the lever, and the control plate is moved forward and backward by rotating the second lever.