JPH048499Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a pinch roller guide mechanism for guiding a pinch roller, particularly in a tape recorder equipped with a rotating head, and is useful when adopted in a digital tape recorder. In particular, the present invention relates to a pinch roller guide mechanism that improves workability and smoothes the operation of the pinch roller.

[Technical background of the invention and its problems] In recent years, with the development of digital audio technology,
Techniques have been developed for converting analog audio signals into digital signals and recording them on tape. In this way, converting an analog signal into a digital signal requires an extremely wide proprietary frequency band, so the contact area per unit time is widened in the magnetic head for recording or reproducing signals on tape. There is a need. For this purpose,
Since it is essential to adopt a rotating head system in place of the conventional fixed head system, various types of tape recorders equipped with rotating heads have been proposed based on these conditions.

In such a tape recorder, after loading a tape cassette, a loading block pulls out the tape and winds it around a rotating head. Due to this configuration, the pinch roller that presses the tape onto the capstan also needs to be moved back and forth in the same way as the loading block. As a result, the pinch roller has two operations: a back-and-forth operation associated with tape loading and a pressing operation against the capstan. The back and forth movement of the pinch roller is guided by a pinch roller guide groove provided adjacent to the guide groove of the loading block on the tape recorder board, and is performed by the driving force of the loading motor. On the other hand, the crimping operation is performed by a pinch roller crimping mechanism driven by a loading motor, but the following problems have conventionally existed regarding this operation.

In other words, due to tape loading, etc., the pinch roller needs to take a moving path in which one end moves forward on the pinch roller guide groove and then returns diagonally backward to press against the capstan, so the pinch roller must be released from the press against the capstan. When this occurs, the pinch roller must be advanced from the crimping position to the stop position. Conventionally, as a means for performing the operation from the pressing position to the stop position, a pinch roller guide groove has been processed into a shape as shown in FIG. 4A or FIG. 4B. First, in the configuration shown in FIG. 4A, a hook-shaped extending portion 33 is provided on the capstan 32 side of the pinch roller guide groove 31, and the tip of this extending portion 33 is set at a position where it is pressed onto the capstan 32. The pressing and separating operations of the pinch roller 34 are carried out by the extending portion 3.
This is done by being guided back and forth over the top. However, in this case, unless the curvature of the groove shape is appropriately set in relation to the direction of the driving force, etc., smooth operation will not be possible, resulting in problems such as performance deterioration and component wear. In addition, the capstan 32 is installed at the mounting position of the capstan 32.
Housing groove 35 for installing the housing of
However, since the extension portion 33 protrudes into the housing groove 35, the machining thereof is troublesome and the mounting of the housing becomes difficult, reducing work efficiency during manufacturing. There is a problem with this. On the other hand, as shown in Fig. 4B, the wide extension part 3
6 and connecting it to the housing groove 35 to improve workability. However, in the case of such a configuration, workability is improved and the housing can be easily installed. When the pinch roller 34 moves (particularly when retreating from the crimping position to the stop position), an operation error is likely to occur in which the pinch roller 34 enters the play side of the extension portion 36.

[Purpose of the invention] The present invention was proposed in order to eliminate the drawbacks of the prior art as described above, and its purpose is to improve the machinability of the pinch roller guide groove in a tape recorder having a rotating head. It is an object of the present invention to provide a pinch roller guide mechanism that allows easy installation of a capstan housing and prevents operational errors.

[Summary of the invention] The pinch roller guide mechanism of the invention has a pinch roller guide groove having an arcuate shape, the outside of one end of which is connected to the housing mounting groove of the capstan, and the pinch roller is pressed toward the stop position by this connection part. It is characterized by the arrangement of plate springs.

With such a configuration, when switching modes from play, the unpressed pinch roller can be reliably guided to the stop position by the plate spring, and no operational errors will occur. Therefore, high precision machining is not required for the pinch roller guide groove, improving machinability.
Furthermore, since the housing groove is secured, the housing can be easily attached.

[Embodiment of the invention] An embodiment of the pinch roller guide mechanism according to the invention as described above will be specifically described with reference to the drawings.

*Structure In FIGS. 1 and 2, an arcuate pinch roller guide groove 1 is formed on the tape recorder board, into which the shaft 2a of the pinch roller 2 is inserted. One end of the pinch roller guide groove 1 is connected on the outside to a housing groove 4 for attaching the housing of the capstan 3. At the connection between the pinch roller guide groove 1 and the housing groove 4, there is a plate spring 5 that presses the pinch roller 2 toward the stop position (downward in the figure).
is installed.

11 is the cam gear of FIG. 1 driven by the loading motor. A grooved cam 11a is provided on the lower surface of the cam gear 11,
Here, the cam plate 12 for pinch roller crimping is shown.
are engaged by the engaging pin 12a in the center thereof. This cam plate 12 has a shaft 12 provided at one end.
b, and is rotatably connected to one end of the connecting plate 13 by an engaging pin 12c provided at the other end. Connection plate 13
An engagement hole 13a is provided at the other end, into which an engagement pin 14a provided at one end of the pinch roller pressure bonding plate 14 is inserted. A spring 15 applied between the plate 12 and the engagement pin 12c moves the pinch roller 2 toward the capstan 3 as the cam plate 12 rotates.
It is designed to rotate in the direction of crimping or separating. At the other end of the pinch roller crimping plate 14, a crimping claw 14b and a return claw 14c are provided facing each other.

Furthermore, a second cam plate (not shown) is engaged with the groove cam 11a of the first cam gear 11, and a second cam gear 20 for driving the pinch roller and a second cam gear 20 for tape loading are connected via this plate. The loading blocks are individually driven.

Of these, an engagement pin 21a provided at one end of a pinch roller drive arm 21 is attached to the grooved cam 20a of the second cam gear 20, and this pinch roller drive arm 21 is connected to the first cam gear 1.
1, it rotates counterclockwise in the figure with a certain time difference, and the pinch roller drive plate 22 is driven to the right in the figure by the engagement pin 21b provided at the other end. It's becoming like that. This pinch roller drive plate 22 is connected to a pinch roller drive rack 24 via a spring 23.
The pinch roller drive rack 24 is connected to a pinch roller gear 26 via a pinch roller pull-out gear 25. The pinch roller gear 26 is connected to the pinch roller plate 2
A pinch roller arm 28 is rotatably attached to the other end of the pinch roller plate 27, and the pinch roller 28 is attached to the other end of the pinch roller arm 28. is provided. With such a configuration, the pinch roller 2 can rotate when the second cam gear 20 rotates counterclockwise (when the first cam gear 11 rotates clockwise).
It moves forward after a certain period of time, and immediately retreats when rotating in the opposite direction.

Note that 29 in the figure is a rotating head.

*Operation The operation of this embodiment having the above configuration is as follows.

During tape loading During tape loading, the loading motor rotates at the same time as set loading is completed by inserting a cassette. As a result, the first cam gear 11 rotates clockwise from the position shown in FIG. 1 via the reduction mechanism.

With this operation, the loading lock advances toward the rotary head 29 via the grooved cam 11a on the lower surface of the first cam gear 11 and the loading cam plate, and tape loading is performed.

On the other hand, the pinch roller 2 is connected to the second cam gear 2 until the loading lock advances to a certain extent.
It is stopped at the retracted position shown in FIG. 1 by the grooved cam 20a. When the second cam gear 20 rotates by a certain angle, the engagement pin 21a of the pinch roller drive arm 21 enters the small diameter portion of the grooved cam 20a. Roller 2 starts moving forward.

Finally, after the loading lock is fixed at a predetermined position and the tape comes into contact with the rotary head 29, the first cam gear 11 is rotated several tens of degrees and brought to a stop state. At this time, pinch roller 6
is due to the biasing force of the plate spring 5.
It is held at the stop position as shown in the figure.

During play During play, from the state shown in FIG.
2 and the connecting plate 13, the spring 15
Due to the biasing force of the pinch roller crimping plate 1
4 to the capstan 3 side. As a result,
The pinch roller 2 moves against the plate spring 5 and presses against the capstan 3. At this time, the grooved cam 11a of the first cam gear 11 causes
No driving force is transmitted to the loading block.

When the first cam gear 11 rotates by a predetermined angle, the play detection switch is turned on, the reel motor rotates, and the loading motor stops. At this time, since the grooved cams of the first and second cam gears 11 and 20 are stopped, the pinch roller 2 is secured at the play position as shown in FIG. 3.

Switching operation from the play state In the play state shown in FIG. rotates counterclockwise, the pinch roller 2 is moved back to the stop position shown in FIG. 2 by the biasing force of the plate spring 5. When a fast forward rewinding command is issued, the loading gear further rotates from this position to move to the fast forward rewinding position.

When ejecting When ejecting, the loading block is moved backward by rotating the loading motor in the reverse direction from the stopped state, and the pinch roller 2 is separated from the capstan 3 and moved backward. This turns on the unloading detection switch and
The cassette loading motor is turned on and an eject operation is performed.

As explained above, according to this embodiment, the simple structure of providing the plate spring 5 at the end of the pinch roller guide groove 1 for pressing the pinch roller 2 to the stop position allows the tape to be easily loaded and played. When switching modes, the pinch roller can be guided reliably and no operational errors occur. Because of this, the pinch roller guide groove does not require high-precision machining, improving machinability, and since the housing groove is secured,
The housing can also be easily installed.

[Other Embodiments] Note that the present invention is not limited to the above embodiments, and the shape of the pinch roller guide groove and the shape of the plate spring can be changed as appropriate. In addition, the connection configuration of the tape loading mechanism, pinch roller drive mechanism, pinch roller crimping mechanism, etc. can be selected as appropriate, and the shape of each member can be changed freely. It is set taking into account the order and time difference between the two.

[Effects of the invention] As explained above, according to the invention, in a digital audio tape recorder having a rotating head, the simple structure of attaching a plate spring to the pinch roller guide groove prevents operational errors. , it is possible to provide a pinch roller guide mechanism with improved workability and installation workability.

[Brief explanation of the drawing]

1 to 3 are plan views showing a pinch roller guide mechanism according to an embodiment of the present invention, and FIGS. 4A and 4B are schematic plan views showing different examples of the conventional pinch roller guide mechanism. . 1...Pinch roller guide groove, 2...Pinch roller, 2a...Pinch roller shaft, 3...Capstan, 4...Capstan housing groove, 5
... Plate spring, 11 ... First cam gear, 12 ... Cam plate, 14 ... Pinch roller crimping plate, 20 ... Second cam gear, 2
DESCRIPTION OF SYMBOLS 1... Pinch roller drive arm, 24... Pinch roller drive rack, 25... Pinch roller pull-out gear, 26... Pinch roller gear, 27... Pinch roller plate, 28... Pinch roller arm, 29... Rotation Head.

Claims (1)

[Claims for Utility Model Registration] In a pinch roller guide mechanism for guiding a pinch roller used in a tape recorder equipped with a rotating head, the pinch roller guide mechanism is formed into an arcuate shape, and the outside of one end is connected to the housing mounting groove of the capstan. A pinch roller guide mechanism comprising: a pinch roller guide groove; and a plate spring provided at a connecting portion of the pinch roller guide groove so as to press the pinch roller toward a stop position.