JPS62164258A - Pinch roller press-contacting mechanism - Google Patents

Abstract

PURPOSE:To press-contact a pinch roller in a tape wind mode and to avoid the useless actions in a mode switching state by using a cam gear which is driven by a loading motor to drive a pinch roller press-contacting plate. CONSTITUTION:The hook pin 2a of a cam plate 2 is fitted to the groove cam 1a of a cam gear 1 which is driven by a loading motor. The plate 2 is connected to a coupling plate 3 via a hook pin 2c and the hook pin 4a of a pinch roller press-contacting plate 4 is put into a hook hole 3a. In a tape loading mode a pinch roller 6 is moved up to the front of a capstan 7 via a cam gear 10 and a drive plate 12. In a play mode the gear 1 turns right and the roller 6 is pressed by the energizing force of a press-contacting spring 5 via a plate 4. Thus the roller 6 is pressed in a tape winding state and therefore the useless actions can be avoided in a mode switching state.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a pinch roller crimping mechanism for crimping a pinch roller, especially in a digital audio tape recorder equipped with a rotary head. This relates to a pinch roller crimping mechanism that allows fast forwarding and rewinding operations to be performed in a state in which the roller is wound around a rotating head.

[Technical Background of the Invention and Problems Therewith] In recent years, with the development of digital audio technology, technology has been developed for converting analog audio signals into digital signals and recording them on tape. In this way, converting analog signals to digital signals 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 the tape cassette, the loading block
A configuration is adopted in which the tape is pulled out and wound 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.

Therefore, when considering driving the loading block and capstan at the same time for the purpose of simplifying the mechanism, the crimped state of the capstan and the state of completion of advancement of the loading block must be made to correspond to each other. When the loading block reaches the forward position, the loading block is in the middle of forward movement. This means that the loading block must be separated from the rotating head when opening the capstan during the stop operation and the fast forward/rewind operation, but this operation itself is wasteful;
This causes the problem of prolonging the time it takes to switch operations.

On the other hand, a configuration has been proposed and put into practical use in which the back and forth movement of the pinch roller and the crimping operation are separated into drive systems, and the crimping of the pinch roller is controlled by a plunger. However, with this configuration, although it is possible to perform fast forward, rewind, and stop operations by winding the tape around the rotating head (while keeping it open), the plunger is expensive, resulting in loss of 1 to 100%, and the electrical connection configuration is difficult. There are some issues that need to be addressed.

OBJECT 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 provide a digital audio tape recorder having a rotary head with the same drive as the tape loading mechanism. By making it possible to press the pinch roller while the tape is still wrapped around the rotating head, unnecessary operations can be omitted when switching to fast forward/rewind operation or stop operation. It is an object of the present invention to provide a pinch roller crimping mechanism which is capable of shortening operation switching time, and is also inexpensive in terms of cost.

[Summary of the Invention] The pinch roller crimping mechanism of the present invention drives a pinch roller crimping plate via a cam plate and a connecting plate by a groove cam provided on a cam gear driven by a loading motor, and The present invention is characterized in that the pinch roller pressing plate is pressed against the pinch roller by a spring, so that the pinch roller is pressed against the capstan.

With this configuration, the pinch roller is crimped by a series of drive systems using the loading motor as the drive source, and the pinch roller is pressed as the cam gear rotates while the tape is wound around the rotating head. It is designed to perform crimping and contact/separation operations. Therefore, during the fast forward/rewind operation and the stop operation, the operation switching time can be shortened without performing any unnecessary operations.

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

*Configuration In FIGS. 1 and 2, the lower surface of the first cam gear 1 driven by the loading motor has a grooved cam 1a.
is provided, and a cam plate 2 for pinch roller pressing is engaged here with an engaging pin 2a at the center thereof.

This cam plate 2 is rotatable about a shaft 2b provided at one end, and is rotatably connected to one end of a connecting plate 3 by an engagement pin 2c provided at the other end. An engagement hole 3a is provided at the other end of the connecting plate 3, into which an engagement pin 4a provided at one end of the pinch roller crimping plate 4 is inserted. By the spring 5 hung between the dowel pin 4a and the engagement pin 2G of the cam plate 2,
As the cam plate 2 moves in the same direction, the pinch roller 6 is rotated in the direction of pressing the capstan 7 into contact with or separating it from the capstan 7. Also,
The other end of the pinch roller crimping plate 4 has a crimping claw 4b.
and a return claw 4c are provided facing each other.

Further, a second cam plate (not shown) is engaged with the groove cam 1a of the first cam gear 1, and a second cam gear 10 for driving the pinch roller and a loading device for tape loading are connected via this plate. Each block is driven individually.

Of these, the grooved cam 10a of the second cam gear 10 has an engaging pin 1 provided at one end of the pinch roller drive arm 11.
1a is attached, and when the first cam gear 1 rotates clockwise, this pinch roller drive arm 11 rotates counterclockwise in the figure with a certain time difference, and its (L)
H) The pinch roller drive plates 1 to 12 are driven to the side in the figure by the engagement pin 11b provided in a.

This pinch roller drive plate 12 has a spring 13
The pinch roller drive rack 14 is connected to a pinch roller gear 16 via a connection gear 15. The pinch roller gear 16 is integrally provided at one end of the pinch roller plate 17, and a pinch roller arm 18 is rotatably attached at one end to the other end of the pinch roller plate 17. A pinch roller 6 is provided at the other end of the arm 18. On the other hand, an arcuate guide groove 19 is formed in the tape recorder board, into which the shaft 6a of the pinch roller 6 is inserted. With this configuration, the pinch roller 6 moves forward after a certain period of time when the second cam gear 10 rotates counterclockwise (when the first cam gear 1 rotates clockwise), and immediately retreats when the second cam gear 10 rotates in the opposite direction. It looks like it will.

In addition, 20 in the figure is a rotating head.

*Function The operation of the pinch roller crimping mechanism of the present invention having the above-mentioned configuration is as follows.

■When loading a tape When loading a tape, the loading motor rotates as soon as the cassette is inserted and the loading of the cassette is completed. As a result, the first cam gear 1 rotates clockwise from the position shown in FIG. 1 via the reduction mechanism.

Along with this operation, the groove cam 1a on the lower surface of the first cam gear 1
The loading block advances toward the rotary head 20 via the loading cam plate and tape loading is performed.

On the other hand, the pinch roller 6 moves the grooved cam 1 of the second cam gear 10 until the loading block advances to a certain extent.
0a, it is stopped at the retracted position shown in FIG. When the second cam gear 10 rotates by a certain angle, the engagement pin 11a of the pinch roller drive arm 11 enters the small diameter portion of the grooved cam 10a. Roller 6 starts moving forward.

Finally, after the loading block is fixed at a predetermined position and the tape comes into contact with the rotary head 20, the first cam gear 1 is rotated several tens of degrees and brought to a stop state. At this time, the pinch roller 6 is held at a position slightly before the pressing position shown in FIG. 2 and not in contact with the capstan 7.

■When playing When playing, from the above-mentioned tape loading completion state, rotate the loading motor and set the first cam gear 1.
By rotating clockwise, the pinch roller pressing plate 4 is rotated toward the capstan 7 by the biasing force of the spring 5 via the cam plate 2 and the connecting plate 3.

As a result, the pinch roller 6 is pressed against the capstan 7. At this time, no driving force is transmitted to the loading block by the groove cam 1a of the first cam gear 1. When the first cam gear 1 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 1 and 10 are stopped, the loading block and the pinch roller 6 are each secured at the play position.

■Fast forwarding and rewinding During fast forwarding and rewinding, the loading motor rotates in the opposite direction, and the first cam gear 1 rotates counterclockwise. At this time, the loading block is held on the rotating head 20 side by the grooved cam 1a, but the pinch roller pressing plate 4 is driven in the release direction by the grooved cam 1a via the cam plate 2 and the connecting plate 3. As a result, the pinch roller 6 separates from the capstan 7.

When the first cam gear 1 rotates by a predetermined angle, a fast forward/rewind switch is turned on, which causes the reel motor to rotate and performs a fast forward or rewind operation.

At the time of ejection at 049191, the loading block is moved backward by rotating the loading motor in the reverse direction from the stopped state, and the pinch roller 6 is separated from the capstan 7 and moved backward. This turns on the unloading detection switch, turns on the cassette loading motor, and performs the ejecting operation.

As explained above, according to this embodiment, the cam play 1 is controlled by the groove cam of the cam gear driven by the loading motor.
With a simple configuration in which the pinch roller pressing plate is driven through ~ and the connecting play (~), the pinch roller can be pressed while the tape is wound around the rotary head.

Therefore, there is no need to move the loading block during the fast forward/rewind operation or the stop operation, and the time required for switching operations can also be shortened. Furthermore, compared to a method in which the pressure of the pinch roller is controlled by a plunger, the cost can be reduced and no electrical connection structure is required.

[Other Examples] Note that the present invention is not limited to the above-mentioned embodiments, and the connection configuration of the tape loading mechanism, pinch roller drive mechanism, etc. can be selected as appropriate, and the shape of each member can also be freely selected. Can be changed. Further, the shape of the grooved cam provided in the cam gear is set in consideration of the order and time difference of each operation.

[Effects of the Invention] As explained above, according to the present invention, in a digital audio tape recorder having a rotating head, the pinch roller pressing plate is configured to be driven by a cam gear driven by a loading motor. Because of this, fast-forward, rewind and stop operations can be performed with the tape wrapped around the rotating head, eliminating problems such as unnecessary loading block operations and long operation switching times, and reducing costs. It is possible to provide a pinch roller crimping mechanism that can realize the following.

[Brief explanation of drawings]

1 and 2 are plan views showing a pinch roller pressure bonding mechanism in an embodiment of the present invention, respectively. 1... First cam gear, 2... Cam plate, 3...
... Connection plate, 4... Pinch roller crimping plate, 5... crimping spring, 6... Pinch roller, 7... Capstan, 20... Rotating head. Procedural amendment (voluntary) March 10, 1986

Claims (1)

[Scope of Claims] A pinch roller crimping mechanism for crimping a pinch roller to a capstan used in a digital audio tape recorder equipped with a rotating head, comprising: a. a grooved cam and driven by a loading motor; cam gear. b. A cam plate that engages with the grooved cam of the cam gear. c. A connecting plate that is rotatably connected to the cam plate at one end and has a long hole at the other end. d. A pinch roller crimping plate including a position regulating portion inserted into the long hole of the connecting plate. e. A pressure spring, which is provided between the pinch roller pressure plate and the cam plate, and urges the pinch roller pressure plate in a direction that presses the pinch roller in the capstan pressure bonding direction. A pinch roller crimping mechanism characterized by comprising each of the members a to e above.