JP2658452B2 - Magnetic recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus such as a video tape recorder, and more particularly to an improvement of a cam body which is rotationally displaced according to an operation mode.

[Prior Art] FIG. 3 is a plan view showing a cam portion in a conventional magnetic recording / reproducing apparatus. In FIG.
a) is the cam groove in the range of rotation angle from 0 ° to 270 °, EJEC
T, stop, play, reverse play, fast forward / rewind (F
F / REW), and is formed endlessly.

(2) is a gear portion formed on the outer periphery of the cam body (1), (3) is a drive gear that meshes with the gear portion (2) and drives and rotates the cam body (1), and (4) is a cam follower. Are mounted so as to be swingable about the support shaft (6).

(5) is a pin planted at one end of the cam follower (4), which is inserted into the cam groove (1a). (7) is a plate cam, which drives a mechanical component (not shown) on the deck base in conjunction with the swing of the cam follower (4) via the long groove (7a) and the pin (6a).

FIG. 4 shows the arrangement of the operation modes of the cam body (1) expanded on a straight line.

 Next, the operation of the above configuration will be described.

EJECT mode, which is the operation mode for tape cassette insert and eject (this is the initial mode)
For example, when the playback mode is shifted to the playback mode and playback is performed, and then the mode is returned to the initial mode and the tape cassette is taken out, first, the cam body (1) is driven by the driving gear (3).
, As shown by the arrow a in FIG. 3, and moves to the position of the reproduction mode by rotating clockwise. Then, as shown by an arrow b in FIG. 3, after the reproduction, an operation of reversely rotating in the counterclockwise direction and returning to the initial mode EJECT mode is performed.

With the rotation of the cam body (1) as described above, the cam follower (4) swings and drives the plate cam (7) to a predetermined position.

[Problems to be Solved by the Invention] Since the conventional magnetic recording / reproducing apparatus is configured as described above, for example, when the tape cassette is taken out after finishing the FF / REW, the cam body is moved to the innermost part of the cam groove. In this case, it is necessary to reverse the operation of the tape cassette and return to the initial mode. Further, at this time, there is also a problem that the reproduction mode and the reverse reproduction mode that are not particularly required must be passed due to the arrangement of the modes as shown in FIG.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a magnetic recording / reproducing apparatus capable of shortening the time required for mode transition as much as possible.

[Means for Solving the Problems] A magnetic recording / reproducing apparatus according to the present invention has a cam groove provided with a plurality of operation mode positions, and includes a cam body which is rotationally displaced in accordance with the operation mode. In the device, the cam groove of the cam body is formed in a loop shape where the start point and the end point coincide with each other at the initial mode position, and the required rotation angle of the cam body from the operation mode to the initial mode or from the initial mode to the operation mode is smaller. It is configured to select a direction.

Further, the configuration is such that the rotation direction in which the required rotation angle of the cam body is smaller, between the plurality of stop modes provided in the cam groove and the initial mode, is selected.

According to the present invention, the cam groove is formed in a loop shape in which the start point and the end point coincide with each other at the initial mode position, and the required rotation angle of the cam body from the operation mode to the initial mode or from the initial mode to the operation mode is small. By selecting the rotation direction, the mode can be shifted quickly.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing a cam section in a magnetic recording and reproducing apparatus according to one embodiment of the present invention.
Since (1) to (7), (6a), and (7a) are the same as those in the conventional example shown in FIG. 3, the same reference numerals are given to the corresponding portions, and detailed description thereof will be omitted.

In FIG. 1, the point different from the conventional example of FIG. 3 is that the cam groove (1a) in the cam body (1) has an endless loop shape whose start point and end point coincide with each other in the position of the EJECT mode. In the rotation angle range of 0 ° to 360 ° in the cam groove (1a), as indicated by the distribution angle in FIG. 2, EJECT, stop 1, reproduction, reverse reproduction, FF /
That is, six mode positions of REW and stop 2 were formed.

 Next, the operation of the above configuration will be described.

For example, when the tape cassette is taken out after FF / REW, the cam unit (1) can be returned to the initial mode, the EJECT mode, by rotating the cam body (1) clockwise as indicated by the arrow a in FIG. In this embodiment, the required rotation angle of the cam body (1) from the FF / REW mode to the initial mode is 135 ° clockwise and 225 ° counterclockwise, and the cam body (1) is rotated clockwise. Accordingly, the time required for returning to the initial mode can be reduced by a time corresponding to the rotation angle of 90 °.

When returning from the stop 1 mode to the initial mode, the required rotation angle of the cam body (1) is 225 degrees clockwise and 105 degrees counterclockwise. In this case, the time required to return to the initial mode is shorter when the cam body (1) is rotated counterclockwise. Therefore, in this case, the cam body (1) is rotated counterclockwise as shown by the arrow b in FIG. 1 to return to the initial mode.

As described above, in this embodiment, stop 1, playback,
The required rotation angle from each of the reverse playback modes to the initial mode is smaller in the counterclockwise direction, and the required rotation angle from each of the FF / REW and Stop 2 modes to the initial mode is smaller in the clockwise direction. Thus, by selecting the rotation direction in which the required rotation angle up to the initial mode is smaller, the rotation angle from each operation mode to the initial mode can be reduced, and the time required to return to the initial mode can be reduced. .

In the above embodiment, the selection of the rotation direction for returning to the initial mode has been described. However, when shifting from the initial mode to the next mode, the mode shift is performed by selecting the rotation direction with the smaller required rotation angle. May be configured. For example, when performing FF / REW by inserting a tape cassette, turning to the FF / REW mode by rotating counterclockwise can shorten the time required for mode transition, which is more advantageous in operation. It is.

[Effects of the Invention] As described above, according to the present invention, the cam groove of the cam body is formed in a loop shape in which the start point and the end point coincide at the initial mode position, and the operation mode is set to the initial mode or the initial mode is set to the operation mode. By selecting the rotation direction in which the required rotation angle of the cam body between the stop mode and the initial mode is smaller, the mode transition can be performed quickly, and the time required for the mode transition can be reduced. There is.

In addition, there is an effect that it is possible to quickly react to the operation of the device.

[Brief description of the drawings]

FIG. 1 is a plan view showing a cam portion of a magnetic recording / reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a layout diagram showing an example of an arrangement of operation modes, and FIG. FIG. 4 is a layout diagram showing an example of a conventional operation mode arrangement. (1) ... cam body, (1a) ... cam groove. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (2)

(57) [Claims] 1. A magnetic recording / reproducing apparatus having a cam groove provided with a plurality of operation mode positions and having a cam body which is rotationally displaced in accordance with the operation mode, wherein a start point and an end point of the cam groove are initially set. Form a loop that matches at the mode position,
A magnetic recording / reproducing apparatus, wherein a rotation direction in which the required rotation angle of the cam body from the operation mode to the initial mode or from the initial mode to the operation mode is smaller is selected. 2. The method according to claim 1, wherein a rotation direction of the plurality of stop modes provided in the cam groove and a rotation direction having a smaller required rotation angle of the cam body up to the initial mode are selected. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein: