JPH04278251A - Magnetic recording and reproducing apparatus - Google Patents

Abstract

PURPOSE:To simplify a positioning mechanism in a magnetic recording and reproducing apparatus wherein a small tape cassette and a standard tape cas sette can be alternatively loaded. CONSTITUTION:In arms 26a and 26b which can be freely turned, positioning pins 27a and 27b for a small tape cassette 11 are provided at the end part within the loading range of the small tape cassette 11, and levers 28a and 28b are provided at the outside of the loading range. When a standard tape cassette 12 which is larger than the small tape cassette 11 is loaded, the positioning pins 27a and 27b for the small tape cassette 11 are turned with the arms, and the cassette is fixed with second positioning pins 30a and 30b.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording and reproducing apparatus capable of recording and reproducing by selectively mounting either a standard tape cassette or a smaller tape cassette, and particularly relates to a tape cassette positioning mechanism. It is something.

0002

2. Description of the Related Art In recent years, magnetic recording and reproducing devices such as video tape recorders use standard tape cassettes and smaller tape cassettes having the same tape width. Small tape cassettes are widely used in camera-integrated video tape recorders. Now, in order to record and play back a small tape cassette on a VTR for standard tape cassettes, it is necessary to attach it to an adapter to create a tape loop equivalent to that of a standard tape cassette, which has the disadvantage of poor operability. was there.

[0003] In order to overcome these drawbacks, magnetic recording and reproducing apparatuses have been proposed that can mount a small tape cassette and a standard tape cassette without using an adapter (for example, Japanese Patent Laid-Open No. 1-40856 Publication No.). FIG. 5 is a side view of a conventional magnetic recording/reproducing apparatus in which a small tape cassette is installed. In this figure, a support shaft 2 is installed vertically on a chassis 1, and a base 3 is urged above it by a biasing spring 4. The base 3 is slidable with respect to the support shaft 2, and the biasing spring 4
It is always urged upward by the shaft, and cannot rotate around the support shaft. Further, as shown in the drawing, a rod 6 having vertical spacer pins 5a and 5b is provided on the upper surface of the chassis 1 so as to be movable in the left-right direction. chassis 1
A drive shaft 7 for driving any of the attached tape cassettes is provided on the top. Also, on the base 3 are positioning pins 8a and 8b for fixing a small tape cassette.
is provided. Furthermore, a notch 3a is formed for allowing the spacer pin 5b to protrude when the rod 6 moves in the direction shown in FIG. 6 and the base 3 is pushed down. The rod 6 is configured to be able to slide to the position shown in FIG. 5 or 6 in conjunction with a mechanism that detects the insertion of the small tape cassette 11 or the standard tape cassette 12.

Next, the operation when a tape cassette is installed will be explained. First, when installing the small tape cassette 11 from above, an insertion sensing mechanism (not shown) of the tape cassette 11 moves the rod 6 to the position shown in FIG.
a and 4b are located coaxially. When the small tape cassette 11 is installed in this state, the small tape cassette 11 pushes down the positioning pins 8a and 8b, which are biased by the biasing spring 4, to a position where they interfere with the spacer pins 5a and 5b. The small tape cassette 11 moves to a predetermined position. In this way, the position of the small tape cassette 11 is determined accurately, and the drive shaft 7 is connected to the small tape cassette 11.
The magnetic tape is pulled out by meshing with a gear provided on the outer periphery of the reel hub.

Next, when the standard tape cassette 12 is installed, the rod 6 is moved to the left as shown in FIG. 6 by an insertion sensing mechanism (not shown) of the standard tape cassette 12. Therefore, the spacer pins 5a and 5b do not interfere with the base 3. When the standard tape cassette 12 is installed in this state, the lower surface of the standard tape cassette comes into contact with the positioning pins 8a, 8b as shown in FIG. 8b and base 3 downward. At this time, the spacer pin 5b passes through the notch 3a provided in the base 3 and protrudes as shown in FIG.
will not interfere with Therefore, the standard tape cassette 12 is fixed at a predetermined position by a positioning pin (not shown) dedicated to the standard tape cassette.

[0006]

[Problems to be Solved by the Invention] However, according to such a conventional magnetic recording/reproducing device that can mount two types of cassettes, an insertion detection method that detects insertion of either a small tape cassette or a standard tape cassette is required. This requires a mechanism and a rod drive mechanism that moves the spacer pin in conjunction with the mechanism. Therefore, the structure of the tape cassette positioning mechanism becomes complicated and the number of parts increases. This not only increases the price, but also makes it difficult to make the mechanism section thinner.

The present invention has been made in view of the problems of conventional magnetic recording and reproducing devices, and its technical object is to simplify the positioning mechanism of a small tape cassette.

[0008]

[Means for Solving the Problems] The present invention provides a magnetic recording and reproducing device in which a first tape cassette and a second tape cassette larger than the first tape cassette are selectively loaded and record and reproduce signals. the arm includes a first positioning pin of the first tape cassette at one end and a lever higher than the first positioning pin at the other end, and rotatably holds the arm on the base. , a first positioning means arranged such that the first positioning pin is located within the mounting range of the second tape cassette and the lever is located together with the first tape cassette and outside the range; a biasing means for biasing the first positioning pin to be perpendicular to the base; and a biasing means fixedly provided on the base outside the attachment range of the first tape cassette to position the second tape cassette. A second positioning means is provided.

[0009]

According to the present invention having such features, when a small tape cassette is installed in a magnetic recording/reproducing apparatus, it is fixed at a predetermined position by the first positioning means. Further, when the second tape cassette is installed, the arm is rotated by being pressed against the lower surface of the second tape cassette, and the second tape cassette is installed at a predetermined position by the second positioning means instead of the first positioning means.

0010

Embodiments Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing the structure of a cassette mounting section of a magnetic recording/reproducing apparatus according to this embodiment, and FIG. 2 is a side view thereof. In these figures, there are small tape cassettes (first tape cassettes) indicated by two-dot chain lines on the base 21.
11 and a mounting position for a standard tape cassette (second tape cassette) 12 are provided. As in the prior art described above, a drive means 22 is provided on the base as a drive mechanism for these tape cassettes. In this embodiment, a pair of side bases 23 and 24 are provided on the left and right sides of the end portion of the attachment range of the small tape cassette 11. Since the structures of the side bases 23 and 24 are the same, one side base 23 will be described below. side base 23
is composed of L-shaped members 23a and 23b mounted on a base, and a rotating shaft 25a is provided between the pair of members 23a and 23b as shown. This rotating shaft 25a
An arm 26a is rotatably held in the arm 26a. As shown in the figure, a positioning pin 27a is provided within the range of the small cassette device of the arm 26a. Further, a lever 28a having a hemispherical tip and higher than the tip of the positioning pin 27a is provided outside the attachment range of the small tape cassette. That is, the arm 26a is composed of a positioning pin 27a and a lever 28a. Further, in order to hold the arm 26a vertically, a torsion coil spring 29a is provided, one end of which engages with the lower surface of the arm 26a, and the other end of which engages with the side base 23. Each part on the side base 24 side also has a similar structure. Here, the side bases 23, 24, rotating shafts 25a, 25b, and arms 26a, 26b constitute a first positioning means that defines the mounting position of the first tape cassette. The torsion coil springs 29a, 29b are connected to the positioning pins 27a, 27b of the arms 26a, 26b.
This is a biasing means for biasing the base 21 to be perpendicular to the base 21. Furthermore, positioning pins 30a and 30b are provided on the base 21 for defining the mounting position of the standard tape cassette 12 outside the mounting range of the first small tape cassette 11.
is provided. The positioning pins 30a, 30b are second positioning means for positioning the second tape cassette.

The operation of the magnetic recording/reproducing apparatus constructed as described above when a tape cassette is loaded will be explained. First, when installing the small tape cassette 11 in the installation position shown in FIG.
are located at positions that do not interfere with the small tape cassette 11, so the positioning pins 27a and 27b for positioning the small tape cassette 11 are inserted into positioning holes (not shown) provided on the back of the small tape cassette 11. Ru. At this time, the positioning pins 27a and 27b are biased perpendicularly to the base 21 by the torsion coil springs 29a and 29b, so the small tape cassette 11 is positioned at a predetermined position and driven by the driving means 22.

Next, when installing the standard tape cassette 12, the standard tape cassette 12 is first inserted into the mounting position shown in FIG. 3 and moved downward. Then, the lower surfaces of the levers 28a, 28b come into contact with the upper surfaces of the levers 28a, 28b, and the arms 26a, 26b rotate against the spring force of the torsion coil springs 29a, 29b. When the standard tape cassette 12 is further pushed down, the positioning pins 27a and 27b
The upper surface comes into contact with the lower surface of the standard tape cassette 12 and rotates. And as shown in Figure 4, arm 2
Positioning pins 30a, 30 are planted on the base 21 with the pins 6a, 26b rotated approximately 90 degrees from their original positions.
The standard tape cassette 12 is fixed by b.

Furthermore, when the standard tape cassette 12 is ejected from the apparatus, the standard tape cassette 12 moves upward, so the arms 26a and 26b are rotated by the biasing force of the torsion coil springs 29a and 29b. Return to state 1.

As described above, this embodiment eliminates the need for an insertion sensing mechanism for sensing the insertion of a small or standard tape cassette, a rod mechanism for moving the regulating member in conjunction with this sensing mechanism, and the like. Therefore, positioning of the small tape cassette can be simplified and the number of parts can be reduced.

[0015]

As described in detail above, the present invention provides an insertion detection mechanism for detecting insertion of a small tape cassette or a standard tape cassette, and a small tape positioning mechanism that operates in conjunction with this mechanism. There is no need to provide one. Therefore, the positioning mechanism can be extremely simplified and the number of parts can be reduced. Furthermore, the mechanical part of the tape cassette can be made thinner, and the cost can also be reduced.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the structure of a mounting portion of a tape cassette according to an embodiment of the magnetic recording/reproducing apparatus of the present invention.

FIG. 2 is a side sectional view of the cassette mounting portion of this embodiment.

FIG. 3 is a side cross-sectional view showing a state in which a standard tape cassette is being installed in this embodiment.

FIG. 4 is a side sectional view showing a state when a standard tape cassette is installed in this embodiment.

FIG. 5 is a sectional side view of a positioning mechanism when a small tape cassette is mounted in a conventional magnetic recording/reproducing device.

FIG. 6 is a side sectional view of a positioning mechanism when a conventional standard tape cassette is installed.

[Explanation of symbols]

11 Small tape cassette 12 Standard tape cassette 21 Base 22 Drive means 23, 24 Side bases 26a, 26b Arms 27a, 27b, 30a, 30b Positioning pin 28
a, 28b Lever 29a, 29b Torsion coil spring

Claims (1)

[Claims] 1. A magnetic recording and reproducing apparatus for recording and reproducing signals, in which a first tape cassette and a second tape cassette larger than the first tape cassette are alternatively mounted, the magnetic recording and reproducing apparatus having one end attached to the second tape cassette. a first positioning pin of one tape cassette; an arm having a lever higher than the first positioning pin at the other end; the arm is rotatably held on a base; a first positioning means arranged such that the pin is located within the mounting range of the second tape cassette and the lever is located outside the mounting range of the first tape cassette; a biasing means for biasing the first positioning pin to be perpendicular to the base; and a biasing means fixedly provided on the base outside the attachment range of the first tape cassette, and a biasing means for biasing the first positioning pin to be perpendicular to the base; A magnetic recording/reproducing device comprising: second positioning means for positioning.