JPH067463Y2 - Tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a tape recorder having an automatic reversing function that stabilizes tape running with a simple tape guide structure.

Conventional configuration and its problems In recent years, in tape recorders with automatic reversing function, in order to improve the tape running property in forward rotation and reverse rotation, wow and flutter characteristics, etc., devise the head configuration and tape drive device. Many things that have been added have been seen. A conventional tape guide device for a tape recorder having an automatic reversing function will be described below. FIG. 1 shows the head peripheral portion in the conventional example. At the time of forward rotation, the magnetic tape is sent out at a constant speed by the well-known forward rotation pinch roller (61) and forward rotation capstan (62), and the recording / reproducing head (63). And the first erasing head
(64) and the second erasing head (65) are all in contact with the tape. Also when reversing, the recording / reproducing head (63) and the first erasing head (6
The relative positional relationship between 4) and the second erasing head (65) does not change and is in contact with the tape in the same state as in the normal rotation. However, in the above structure, since the two erasing heads (64) and (65) are always inserted in the cassette half, tape winding occurs around the cassette half ribs, guide pins and each erasing head. As a result, the frictional load at each sliding portion is increased, and the wow and flutter is deteriorated and the tape running is adversely affected.

Further, FIG. 2 shows a head peripheral portion in another conventional example,
In order to solve the drawbacks of the conventional example, the first erasing head (64) corresponds to the switching of forward and reverse, and the first erasing head (64) is changed to the second erasing head during forward rotation.
(65) is retracted, and the first erasing head (6
The tape guide (64a) provided in 4) is also held at a position distant from the tape, and although not shown, each erasing head (64) (65) is in a state opposite to that in the normal rotation at the time of reversing. Is held in. (65a) is a tape guide provided on the second erasing head (65). However, in the above-mentioned configuration, since the movement of the tape in the width direction is not restricted at the position of the erasing head on the retracted side, it is caused by the variation in accuracy of the ribs, guide pins, rollers, pads, etc. of the cassette half. The tape running was unstable due to the difference between the cassette halves.

Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks, and greatly affects the tape running due to the so-called cassette half-specific difference caused by variations in the accuracy of the ribs, guide pins, rollers, pads, etc. of the cassette half. It is an object of the present invention to provide a tape recorder which can reduce the wow and flutter characteristics as well.

In order to achieve the above object, the tape recorder of the present invention is arranged corresponding to both small windows provided on both sides of the central window of the cassette half into which the recording / reproducing head is inserted. Each erasing head, a tape guide provided on the capstan side of each erasing head to regulate the movement of the tape in the width direction, and an erasing head base to which both erasing heads are attached are provided. In conjunction with the normal rotation or reverse running drive, the erasing head on the side where the capstan and the pinch roller are separated is moved forward to bring the erasing head into contact with the tape, while the side on which the capstan and the pinch roller are in contact. Although the erasing head moves backward, it is configured to regulate the movement of the tape in the width direction by the tape guide. Is arranged on the upstream side of the tape drive side in contact with.

Description of Embodiments An embodiment of the present invention will be described below with reference to the drawings (FIGS. 3 to 7).
It will be described based on FIG. FIG. 8 shows a normal rotation reproduction state, and the mechanical substrate (1) and the cassette (2) are shown by a two-dot chain line.
A mechanism driving motor (3) is fixed to the upper surface (front side of the drawing) of the mechanical board (1), and a worm (5) is integrally fixed to a shaft (4) of the motor (3). The right main gear (7) is rotatably held by the main gear shaft (6) that is planted on the lower surface (back side of the paper) of the mechanical board (1), and the relay gear
It meshes with (8). The relay gear (8) and the worm wheel (9) are integrally fixed to the shaft (10), and the worm wheel (9) and the worm (5) are meshed with each other. Mechanical board (1)
The sub-lever shaft (11) installed on the underside of the
2) is rotatably held, and a pin (13) erected on the lower surface of the sub-lever (12) is engaged with a cam groove portion (7a) provided on the upper surface of the main gear (7). That is, the sub-lever (12) is arranged closer to the mechanical board (1) than the main gear (7).
The main lever (14) is rotatably supported by the main lever shaft (15) that is erected on the upper surface of the mechanical substrate (1), and the pins (16) that are erected on the lower surface of this main lever (14) are The sub-lever is passed through an elongated hole (not shown) formed in the mechanical substrate (1).
It engages with the long hole portion (16a) of (12). Left main gear
The (17), the sub-lever (18) and the main lever (19) are configured in the same manner as the right main gear (7), the sub-lever (12) and the main lever (14). That is, the main gear shaft (20) and the sub-lever shaft (21) are planted on the bottom surface of the mechanical substrate (1),
Each of the main gear (17) and the sub-lever (18) is rotatably supported, and the pin (25) set up on the lower surface of the sub-lever (18) is a cam groove (17a) provided on the upper surface of the main gear (17). Is engaged with. The main lever (19) is rotatably supported by the main lever shaft (22) that is erected on the upper surface of the mechanical substrate (1), and the pin that is erected on the lower surface of this main lever (19).
(23) penetrates a long hole (not shown) formed in the mechanical substrate (1) and engages with a long hole portion (18a) of the sub-lever (18).
The long holes of the mechanical board (1) are the pins (16) and (23).
It is formed to fully include the movement trajectory of (23),
There is no hindrance to the movement of the pins (16) (23). In addition, with the main gear (7)
The (17) meshes with the same number of teeth and is configured to rotate in synchronization. The head substrate (24) is held on the mechanical substrate (1) via a steel ball (not shown), and is configured so that it can move forward and backward (upward and downward in the figure) with little frictional resistance. The spring (26) is attached to the boss (24a) that is planted on the head substrate (24).
Is externally fitted, and one end thereof is locked by a pin (27) set up on the head substrate (24). The other end of the spring (26) is locked by a pin (28) also set on the head substrate (24) in the spup mode (not shown).
The tip (26a) of 6) is the boss (19a) (19) of the main lever (19).
When the main lever (19) is rotated counterclockwise around the main lever shaft (22), it is clamped by the bosses (19a) and (19b) of the main lever (19). The head substrate (24) is advanced via the (26), and when it advances to the reproducing device, it is locked by a stopper (not shown), and the head substrate (24) stops, but the main lever (19) rotates further. A gap is created between the moving spring (26) and the pin (28) to absorb the overstroke. The control plate (29) is slidably held in the front-rear direction (vertical direction in the figure) like the head substrate (24), and is configured between the mechanical substrate (1) and the head substrate (24) in the height direction. Has been done. Recess in this control plate (29)
(29a) is engaged with the boss portion (14a) of the main lever (14), and the main lever (14) rotates about the main lever shaft (15), so that the control plate (29) moves forward and backward. Be punished.
Forward pinch roller (30) and reverse pinch roller (31)
Are rotatably supported by pinch levers (32) and (33), respectively, and the pinch levers (32) and (33) are rotatably supported by shafts (34) and (35) set on the mechanical substrate (1). ing. One end of the pinch lever spring (36) is locked by the boss portion (32a) of the pinch lever (32), and the other end is locked by the boss portion (32b) in the stop mode. (36a)
Are clamped by the boss portions (14b) and (14c) of the main lever (14). In the play state, the main lever (14) rotates to rotate the pinch lever (32), but when the pinch roller (30) presses against the forward rotation capstan (37), the pinch lever (32) stops. The spring (36) and the boss portion (32b) of the pinch lever (32) are separated from each other to generate a pin pressure. Since the pinch lever (33) on the left side is completely the same, the details are omitted. The capstans (37) and (38) are pivotally supported by bearings (39) and (40), respectively. In the erasing head base (41), the boss (41a) of the erasing head base (41) has a hole (24
It is fitted to b) and is rotatably held by a leaf spring (42) attached to the head substrate (24), and is interposed between the erase head base (41) and the head substrate (24). With a steel ball (not shown), the frictional resistance is small and the ball can be rotated with high accuracy. The erasing head base (41) is biased by a spring (43) to rotate clockwise. This spring (43)
Is the hole (41b) of the erasing head base (41) and the head substrate (24)
It hangs on the notch (24c). Erase head base (4
1) has a boss portion (41c) on the lower surface, and this boss portion (41c) reaches the control plate (29) through an escape hole (not shown) of the head substrate (24), It is in contact with the cam part (29b) of 29). The forward erasing head (44) and the reversing erasing head (45) are fixed to the erasing head base (41). The forward erasing head (44) and the reversing erasing head (45) are respectively provided with tape guides ( 44a) and (45a) are fixed. 5 and 6 show the recording / reproducing head (46) and its periphery. Recording-play head (4
6) is fixed to the head seat (47) so that it can enter the central window of the cassette half. The head seat (47) is fixed to the head substrate (24) by screws (48) and (49) via a coil spring (not shown) fitted onto the screws (48) and (49). That is, it is possible to stably change the height of the head seat (47) by adjusting the screws (48) (49). The right side of the head seat (47) It is formed in the shape of a roller, and the notches (47a) (47b) on both sides of the roller (5
The shaft part (50a) (50b) of 0) is rotatably held. Control board
The azimuth plate (53) is fixed to the azimuth bosses (51) (52) planted in (29) with screws (54) (55). The outer shape of the azimuth plate (56) is almost the same as that of the azimuth plate (53). It is slidable. Head pins (57) are erected on the head substrate (24) and are fitted in the holes (47c) of the head seat (47). Further, since the coil spring (not shown) externally fitted to the head pin (57) is interposed between the head substrate (24) and the head seat (47), the roller (50) of the head seat (47) is prevented. The holding side is urged to be pushed up. That is, the roller (50) is the azimuth plate (56)
Is in contact with. Azimasbis on the azimuth plate (53)
(58) and (59) are screwed in, and their tips are in contact with the azimuth plate (56). The contact position of the azimuth screw (59) is configured to be the same as the contact position of the roller (50) and the azimuth plate (56) in plan view. FIG. 5 shows the case of the normal rotation reproduction, but in the reverse reproduction, the azimuth screw (58) is arranged directly above the roller (50). Therefore, the control plate (29) is biased so as to be pressed against the head substrate (24) side via the roller (50), the azimuth plate (53), the azimuth bosses (51) (52) and the like.

The operation of the tape recorder of this embodiment constructed as described above will be described below. If, for example, a normal rotation reproduction command is input from the stop state, the microcomputer makes a judgment, the motor (3) is instructed to start, and immediately (3) rotates. Worm (5), worm wheel
(9) The main gear (7) rotates via the relay gear (8).
It goes without saying that at this time, the main gear (17) rotates in synchronization with the main gear (7). Although not shown in the figure, the main gear (7) is provided with a rotational position detecting device (such as a potentiometer and a leaf switch) so that the main gear is up to a normal rotation reproduction state.
When (7) rotates, an electric command is sent to the microcomputer and the motor (3) stops immediately. Since this operation is the same when switching between the modes, it will be omitted below. The stop positions of the main gears (7) and (17) are uniquely determined in each mode such as normal rotation reproduction, reverse reproduction, and stop. The main levers (7) and (17) have cam groove portions (7a) and (17a) that allow the sub-lever (12) and (18) to move further.
The stop position of the main levers (14) (19) is uniquely determined by this. In the normal rotation reproduction state, as shown in the third, the main lever (14) is rotated clockwise to the maximum,
(19) stops at the position where the head substrate (24) reaches the maximum forward position and is further rotated counterclockwise. As already mentioned in the configuration, the overstroke at this time is the spring (26)
The pin and the pin (28) are separated to absorb. The pinch roller (30) is in pressure contact with the capstan (37). Control board
The relative positions of (29) and the head substrate (24) are as shown in FIG. 5, and the azimuth adjustment of the recording / reproducing head (46) is possible with the azimuth screw (59). The pinch roller (31) is separated from the capstan (38). The boss portion (41c) of the erasing head base (41) is in contact with the cam portion (29b) of the control plate (29),
At this time, as shown in FIG. 7, the forward erasing head (44) enters the cassette (2) through the small window portion of the cassette (2), and the tape is held at a sufficiently wound position. On the other hand, the reversing erasing head (45) has also entered the cassette (2) through the small window, but is in a state of retracting with respect to the forward reversing erasing head (44), and the reversing erasing head (45). The tape guide (45a) provided at the position is held so as to regulate the movement of the tape in the width direction even at that position.

Next, the reverse reproduction state will be described. The state is shown in FIG. 4, but the main lever (19) is in a position where it is rotated in the maximum counterclockwise direction. At this time, the pinch roller (31) is in pressure contact with the capstan (38) just as in the normal rotation. At this time,
It goes without saying that the pin (28) and the spring (26) on the head substrate (24) are further separated and absorb the overstroke. The main lever (14) determines the position of the control plate (29) so that the azimuth screw (58) is located directly above the azimuth roller (50).
That is, at this time, the azimuth adjustment of the counterclockwise can be performed by the azimuth screw (58). Further, the boss portion (41c) of the erasing head base (41) is in contact with the cam portion (29c) of the control plate (29), and the erasing head base (41) is more erasable than when it was in contact with the cam portion (29b) during normal rotation reproduction. The head base (41) slightly rotates counterclockwise, and the reverse erasing head (45) on the right side intrudes into the cassette (2) contrary to the forward rotation, and holds it at the position where the tape is sufficiently wound. Has been done.
On the other hand, the reverse erasing head (44) is the cassette
Although it has entered the inside of (2), it is retracted with respect to the reversing erasing head (45), and the tape guide (44a) provided on the forward erasing head (44) has a tape guide at that position. It is held so as to restrict movement in the width direction.

In this embodiment, the forward erasing head (44) and the inverting erasing head (45) are fixed to the erasing head base (41),
Although the erasing head base (41) is shown rotated, it goes without saying that the erasing heads may be moved forward or backward independently or linearly.

DISCLOSURE OF THE INVENTION As described above, according to the present invention, two erasing heads are provided corresponding to both small window portions provided on both sides of the central window portion of the cassette half into which the recording / reproducing head is inserted and disposed, respectively. A tape guide provided on the capstan side of the erasing head to regulate the movement of the tape in the width direction, and an erasing head base to which the erasing heads are attached. The erasing head on the side where the capstan and the pinch roller are distant is moved forward to bring the erasing head into contact with the tape, while the erasing head on the side where the capstan and the pinch roller are in contact retreat. The tape guide is configured to regulate the movement of the tape in the width direction, and this retracted erasing head is located upstream of the tape drive side where the capstan and pinch roller are in contact. Since it is configured to be on the side, the running load is effectively reduced by the pinch roller on the side driving the tape and the tape guide provided on the erasing head located on the upstream side immediately before the capstan. Wow and flutter performance can be improved, and due to the tape width regulation, cassette half ribs, guide pins, rollers,
This significantly reduces the effect on the tape running due to the so-called inherent difference of the cassette halves that occurs due to variations in the pads and the like.

[Brief description of drawings]

1 and 2 are head array diagrams of a tape recorder showing a conventional example, FIGS. 3 to 7 show an embodiment of the present invention, and FIG. 3 is a plan view of a normal reproduction state, and FIG. The figure is a plan view of the reversal reproduction state. Fig. 5 is a plan view of the periphery of the recording / reproducing head.
FIG. 7 is a side view around the recording / reproducing head, and FIG. 7 is a head array diagram in the normal reproduction state. (1) …… Mechanical board, (2) …… Cassette, (3) …… Mechanism drive motor, (7) …… Main gear, (12) …… Sub lever, (14) …… Main lever, (17) ...... Main gear, (1
8) ...... Sub lever, (19) ...... Main lever, (24) ...... Head substrate, (29) ...... Control plate, (30) (31) ...... Pinch roller, (32) (33) ...... Pinch Lever, (37) (38) …… Capstan, (41) …… Erasing head base, (44) …… Forward erasing head, (45) …… Reversing erasing head, (46) …… Recording / playback head , (47) …… Head seat

Claims (1)

[Scope of utility model registration request] 1. Two erasing heads arranged corresponding to both small window portions provided on both sides of a central window portion of a cassette half into which a recording / reproducing head is inserted and disposed, and capstans of the respective erasing heads. A tape guide provided on the side to regulate the movement of the tape in the width direction, and an erasing head base to which both erasing heads are attached. The erasing head base is interlocked with the forward or reverse running drive of the tape, The erasing head on the side where the stun and the pinch roller are separated advances to bring the erasing head into contact with the tape, while the erasing head on the side where the capstan and the pinch roller are in contact retreat, but the width of the tape is reduced by the tape guide. It is configured to regulate the movement in the direction, and this retracted erase head is configured to be on the upstream side of the tape drive side where the capstan and the pinch roller are in contact. Tape recorder, characterized in that.