JPH0442457A - Cassette identification detecting mechanism - Google Patents

Abstract

PURPOSE:To attain the simplification of a mechanism and the miniaturization of a device by detecting respective type of two cassettes with different size by one cassette type identification means. CONSTITUTION:The type of the cassette can be identified and detected by directly abutting the cassette type identification means 33 with an identification part 32b provided at a first cassette 32. An interposing means 36 is abutted with the identification part provided at a second cassette, and the interposing means 36 is moved corresponding to the presence/absence of such abutting, and part of the interposing means 36 is abutted with the cassette type identification means 33 according to the movement of the means. As a result, the respective cassette type can be identified by one cassette type identification means 33. In such a way, the simplification of the mechanism and the miniaturization of the device can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention provides a magnetic recording/reproducing device in which either a first cassette or a second cassette of different size is selectively loaded into a position during recording/reproducing of a magnetic recording/reproducing device; The present invention relates to a cassette identification and detection mechanism for a magnetic recording and reproducing apparatus that identifies and detects at least one type of a loaded cassette.

[Prior Art] There are a plurality of types of cassettes with different sizes as cassettes containing magnetic tape as a magnetic recording medium. For example, as cassettes for recording and playing back using a video tape recorder, there are a VH8 standard cassette and a VB2-C cassette, which is smaller than the standard cassette. A cassette loading mechanism has been developed that allows cassettes of different sizes to be selectively loaded into positions for recording and reproduction.

Each of the different sized cassettes is provided with a cutout groove or the like for identifying the cassette type. For example, cutout grooves are provided to identify the presence or absence of accidental erasure prevention, and the difference between a normal VHS cassette and a 5-VHS cassette, which is a magnetic tape capable of recording and reproducing higher image quality.

13 to 20 show a conventional cassette identification and detection mechanism. Hereinafter, a conventional cassette identification and detection mechanism will be described with reference to these figures.

FIG. 17 shows a state in which the tray 1 is pulled out to the front of the main body and the C cassette 2 is placed in a predetermined position. The tray 1 is connected to the sub-slider 3 by an X-link (not shown). The sub-slider 3 is supported by the grooves 4a and 5a of the left and right main sliders 4.5, and
It is pulled in the direction shown by arrow A in FIG. 17 by a tension spring 6°7. Rack teeth are formed on the lower surfaces of the main sliders 4 and 5, respectively. These rack teeth mesh with left and right drive gears 8 and 9.

The left and right drive gears 8.9 are fixed to the connection shaft 10. Therefore, the left and right drive gears 8.9 rotate in synchronization with the rotation of the worm wheel 11 fixed to one end of the connection shaft 10. The rotation of the motor 12 is caused by the belt 13
is transmitted to the worm 14 by. As the rotation of the worm 14 is transmitted, the worm wheel 11 rotates.

This allows the main slider 4.5 to move between the guide bins 16a* of the side plates 16.17 provided on the chassis 15.
While being supported by 17a, it simultaneously moves in the direction indicated by A. As a result, the C cassette 2 is sent into the main body of the magnetic recording/reproducing apparatus.

FIG. 18 shows a state in which the C cassette 2 has been transferred into the main body, the tape 2a has been pulled out, and then the C cassette 2 has been loaded into the tape loading system. By driving the motor 12 from the state shown in FIG. 17, the main slider 4,
5. The sub-slider 3 and the tray 1 move together in the direction indicated by arrow A. Then, the tip 19a of the lock lever 19 enters the groove 3a of the sub-slider 3. The lock lever 19 is attached to a shaft 18 provided on the side plate 17. As a result, sub slider 3
The movement of tray 1 is locked.

Furthermore, by driving the motor 12, the main slider 4.
After the motor 5 moves in the direction indicated by the arrow A by the length of the grooves 4g and 5a, it comes into contact with the stop switch 20, thereby stopping the rotation of the motor 12. At this time, there are support bins l c, 1 d, 1 e, on the left and right sides of tray 1.
Tray slider 2 provided to be supported by
1.22, since the bottles 21C and 22c at the tip of each are caught in the grooves 4b and 5b of the main slider 4°5, the groove 4a moves in the direction shown by arrow A with respect to the tray 1.

Slide by the length of 5a.

Thereafter, the pull-out lever base 23, which is integral with the tray slider 21, 22, moves in the direction indicated by arrow A relative to the tray 1. The drawer levers 26 and 27, which are rotatably provided on the drawer lever base 23 around the rotating shafts 24 and 25, are the drawer lever bins 26a,
27a are fitted into the elongated holes 1a and lb of the tray 1, so that they rotate in the time=1 direction and in the counterclockwise direction, respectively. As a result, the tape 2a built in the C cassette 2 is moved to the first position by the movement of the tape drawer bins 26b and 27b.
It is pulled out as shown in Figure 8. The right side view and left side view of the C cassette 2 in this state are shown in Figure 19, respectively.
It is shown in FIG.

At the position where the main slider 4.5 is stopped by the stop switch 20 as shown in FIG. 18, the C cassette 2 is in the position shown by the broken line in FIG. Then, when tray 1 is vertically lowered by an X-link (not shown),
The tape is loaded to the position indicated by the solid line. At this time, if the C cassette 2 is of the 5-VHS type, a notch /M2b is provided. If the C cassette 2 is a normal VHS type, the cutout g2b is not provided. therefore,
When the C cassette 2 is of the 5-VHS type, a lever part 28a of the tape type detection switch 28 provided on the switch plate 30 fits into the notch 2b.

At this time, the tape type detection switch 28 does not operate. Further, when the C cassette 2 is a normal VHS type, the lever portion 28a is pressed against the side surface of the C cassette 2, thereby rotating clockwise. At this time, the tape type detection switch 28 is activated. By the above-described mechanism, the normal VHS type and the 5-VHS type are identified and detected.

Similarly, as shown in the left side view of FIG. 20, a notch 2C is provided on the left rear surface of the C cassette 2 to prevent erroneous erasure. Therefore, when the C cassette 2 is a cassette for preventing erroneous erasure, the lever portion 29a of the erroneous erasure prevention detection switch 29 provided on the switch plate 30 fits into the notch groove 2C. At this time, the accidental erasure prevention detection switch 29 does not operate. Also, if C cassette 2 is not a cassette for preventing accidental erasure,
The lever part 29a is pushed by the side surface of the C cassette 2 and rotates counterclockwise. At this time, the erroneous erasure prevention detection switch 29 is activated. As described above, detection to prevent erroneous erasure is performed.

Next, regarding the case of a standard cassette, Figures 13 to 16
This will be explained with reference to the figures. FIG. 13 shows a state in which the tray 1 is pulled out to the front of the main body and the standard cassette 32 is placed in a predetermined position. At this time, the tape pull-out bins 26b and 27b of the pull-out lever for the C cassette enter into the notch 32a provided on the lower surface of the standard cassette 32. By moving from this state in the direction shown by arrow A in FIG. 13, the standard cassette 32 is fed into the main body.

FIG. 14 shows a state in which the standard cassette 32 is transferred into the main body by the drive of the motor 12. At this time, the lock lever attached to the shaft 18 provided on the side plate 17
The tip end 19a of the slider 19 is guided to the upper surface of the in-machine cassette 32 and does not enter the groove 3a of the sub-slider 3. Therefore, the standard cassette 32 is fed into the main body without the sub-slider 3 and the main slider 4.5 sliding relative to each other as when loading the C cassette.

Therefore, the tray sliders 21 and 22 do not slide relative to the tray 1, and the C cassette drawer levers 26 and 27 do not operate.

When tray 1 descends from the above state, the 15th
As shown in the figure and FIG. 16, the standard cassette 32 moves from the dashed line position to the solid line position. At this time, if the tape type detection switch 28 and the accidental erasure prevention detection switch 29 for the C cassette are in the normal position indicated by the broken line, they will come into contact with the bottom surface of the standard cassette 32. Therefore, the switch plate 30 supporting these two switches is rotated about the shaft 31 and moved to the position shown by the solid line.

As shown in FIG. 15, the standard cassette 32 has a 5-V
In the case of the HS type, a hole 32b is provided on the bottom surface of the cassette, so the slide boss 33a of the standard cassette tape type detection switch 33 fits into this hole 32b. At this time, the standard cassette tape type detection switch 33 does not operate. Further, if the standard cassette 32 is a normal V)IS type cassette, the hole 32b is not provided on the bottom surface of the cassette, so the slide boss 3
3a is pushed onto the bottom surface of the standard cassette 32.

At this time, the standard cassette tape type detection switch 3
3 works.

On the other hand, as shown in FIG. 16, when the standard cassette 32 is lowered from the position indicated by the broken line to the position indicated by the solid line, the switch plate 3o rotates around the shaft 31, as in FIG. The erasure prevention detection switch 29 moves. A notch 32c is provided at the rear left side of the standard cassette 32 when it is necessary to prevent erroneous erasure. If this notch 32C exists, when the standard cassette 32 is lowered, the lever portion 34a of the standard cassette accidental erasure prevention detection switch 34 enters into this notch groove 32c. At this time, the standard cassette accidental erasure prevention detection switch 34 does not operate. In addition, if there is no notch groove 32c,
The lever part 34a is pushed against the side of the standard cassette 32,
Rotate as shown in FIG. At this time, the standard cassette erroneous erasure prevention detection switch 34 is activated.

As described above, by providing dedicated detection switches for the C cassette and standard cassette loading operations, erroneous erasure prevention detection and tape type detection are performed.

Problems to be Solved by the Invention [111 According to the conventional cassette identification and detection mechanism, as shown in FIGS. The switch 28 and the tape type detection switch 29 had to be moved downward when the standard cassette 32 was lowered. Therefore,
It was necessary to provide a mechanism for moving the detection switch itself in addition to the original cassette identification and detection mechanism. Furthermore, in order to move each detection switch, it is necessary to provide a space corresponding to the movement range in the main body of the magnetic recording/reproducing apparatus.

As a result, there were problems in that the entire mechanism became complicated and large.

SUMMARY OF THE INVENTION An object of the present invention is to simplify the mechanism for detecting the cassette types of two cassettes of different sizes, and to downsize the apparatus.

[Means for Solving the Problems] A cassette identification and detection mechanism according to the present invention includes a cassette type identification and detection means and an intervening means. The cassette identification detection means can come into contact with an identification portion provided on the first cassette, and identifies and detects the cassette type based on the presence or absence of this contact. The intervening means can abut an identification portion provided on the second cassette;
It also has a portion that moves depending on whether or not the cassette type identification detecting means is in contact with the cassette type identification detection means.

[Operation] In the present invention, the cassette type identification detection means directly contacts the identification portion provided on the first cassette, thereby identifying and detecting the cassette type. Second
An intervening means abuts the identification portion provided on the cassette. The intervening means moves depending on the presence or absence of this contact. With this movement, a portion of the intervening means comes into contact with the cassette type identification detecting means. Thereby, each cassette type of the first and second cassettes can be individually detected by one cassette type identification and detection means.

[Example] 1 to 12 show an embodiment of the present invention.

1 to 4 show the standard cassette 32 installed in the main body. 5A to 8B show the C cassette 2 installed in the main body. Note that FIG. 9 is a top view showing that the drawer lever base 23, the drawer levers 26, 27, and the tray slider 21, 22 are integrally constructed. The tJS10 diagram shows tray 1. FIG. 11 shows the sub-slider 3. FIG. 12 shows the main slider 4.5. Hereinafter, one embodiment of the cassette identification and detection mechanism of the present invention will be described with reference to these figures. In the explanation of each operation, the conventional example (Figs. 13 to 2)
Parts that overlap with the explanation of Figure 0) will be omitted as appropriate.

As shown in FIGS. 1 to 4, detection of erroneous erasure prevention and tape type detection of the standard cassette 32 are performed using detection switches 34 and 33 in the same manner as described in the conventional example. An accidental erasure prevention detection switch and a tape type detection switch for the C cassette are not provided.

The lower surface of the tray 1 is provided with an accidental erasure prevention detection lever 35 that operates while being guided by guide bins Ig, lh, and li, and a tape type detection lever 36 that operates while being supported by the guide bin 1k with the pin 1j as the center. It is being As shown in FIG. 3, the tip 36b of the tape type detection lever 36 is activated by a biasing spring 37 attached between the portion 21a of the tray slider 21 protruding from the bottom surface of the tray 1 and the tip 36b. It is in contact with the end surface of the protruding portion 21b of 21. Further, as shown in FIG. 4, the erroneous erasure prevention detection lever 35 is activated by a biasing spring 38 attached between a portion 22a of the tray slider 22 protruding from the lower surface of the tray 1 and a hook portion 35c. The square hole part 2 of the protruding part 22a of 22
2b (see FIG. 1) is in contact with the end surface. In addition, FIG. 3 shows a state in which the slide boss 33a of the tape type detection switch 33 for standard cassettes has entered the notch groove 32b of the standard cassette 32, and FIG. The lever portion 34a of 34 is shown pressed against the side of the standard cassette 32.

The cassette identification and detection mechanism when the C cassette 2 is loaded will be described with reference to FIGS. 5A to 8B. Fifth
Referring to FIG. A and FIG. 5B, the sub-slider 3 is locked by a lock lever 19 (not shown, similar to FIG. 18) as in the conventional example. Furthermore, the main slider 4.
5 moves in the direction indicated by arrow A, the tray sliders 21 and 22 slide relative to the tray 1.

Thereafter, by rotating the pull-out levers 26, 27, the tape 2a is pulled out by the tape pull-out bins 26b, 27b. In this way, the tray slider 21.2
2 slides, the erroneous erasure prevention detection lever 35 and tape type detection lever 36 move in the direction shown by arrow A.

As shown in FIG. 6, at this time, depending on the presence or absence of the erroneous erasure prevention detection notch groove 2c of the C cassette 2 and the presence or absence of the tape type detection notch groove 2b, the part 35a of the erroneous erasure prevention detection lever 35 and the tape type Part 3 of the detection lever 36
6a either enters the respective grooves or hits the sides.

Each state is shown in FIGS. 5A and 5B. In FIG. 5A, a portion 35a of the accidental erasure prevention detection lever 35 is in contact with the side surface of the C cassette 2, and 351, 351
This indicates that it exists at position g. Also, 5th A
In the figure, a portion 3 of the tape type detection lever 36 is shown.
6a comes into contact with the side surface of the C cassette 2, and 361, 361a
The state that exists at the position is shown. FIG. 5B shows a state in which a portion 35a of the erroneous erasure prevention detection lever 35 has entered the notch groove 2c of the C cassette and is located at a position 352.352a. In addition, in FIG. 5B, a part 36a of the tape type detection lever 36 enters the notch groove 2b of the C cassette 2, and 362.362a
The state that exists at the position is shown.

As shown in Fig. 17A, when the tape type detection lever 36 is located at the position 361, the tip 36b of the tape type detection lever 36 is located above the slide host 33a of the standard cassette tape type detection switch 33. . Therefore, when the tray 1 descends, the slide boss 33g is pushed by the tip 36b of the tape type detection lever. At this time, the standard cassette tape type detection switch 33 is activated. Further, when the tape type detection lever 36 is located at the position 362 as shown in FIG. 7B, the tip portion 36b of the tape type detection lever is
exists at a position away from the slide boss 33a. Even if the tray 1 is lowered, its tip 36b will not touch the slide boss 3.
It does not contact 3a. Therefore, the tape type detection switch 33 does not operate. In this way, the tape type of the C cassette 2 is detected by operating the standard cassette tape type detection switch 33 through the tape type detection lever 36.

Furthermore, as shown in FIG. 8A, when the erroneous erasure prevention detection lever 35 is located at the position 351, the bent portion 35b of the erroneous erasure prevention detection lever is located at the position 351b. When the tray 1 is lowered, the lever portion 34m of the standard cassette accidental erasure prevention detection switch 34 is pushed by the bent portion 35b. At this time, the erroneous erasure prevention detection switch 34 is activated. Further, when the erroneous erasure prevention detection lever 35 is located at the position 352 as shown in FIG. 8B, the bent portion 35b of the deletion prevention detection lever 35 is located at the position 352b. Even if tray 1 is lowered, z
The lever portion 34a of the row n-leaving prevention detection switch 34 does not come into contact with the bent portion 35b. Therefore, the erroneous erasure prevention detection switch 34- does not operate. As described above, the detection of the erroneous erasure prevention of the C cassette 2 is performed by operating the erroneous erasure prevention detection switch 34 with the erroneous erasure prevention detection lever 35 interposed.

In this way, the notch 2b of the C cassette 2.

Depending on the presence or absence of 2c, the accidental erasure prevention detection switch and tape type detection switch for standard cassettes can be activated or deactivated. As a result, in the case of a C cassette, the identification and detection of the cassette can be carried out using a single erroneous erasure prevention detection switch and a tape type detection switch in the same manner as in the case of a standard cassette.

[Effects of the Invention] As described above, according to the present invention, each type of two cassettes of different sizes can be detected by one cassette type identification and detection means, thereby simplifying the cassette identification and detection mechanism. In addition, it is possible to reduce manufacturing costs and downsize the device.

[Brief explanation of drawings]

FIG. 1 is a top view showing a state when a standard cassette is loaded in a cassette identification and detection mechanism according to an embodiment of the present invention. FIG. 2 is a front view of the cassette identification and detection mechanism shown corresponding to FIG. 1. FIG. 3 is a right side view of the cassette identification and detection mechanism shown corresponding to FIG. 1. FIG. 4 is a left side view of the cassette identification and detection mechanism shown corresponding to FIG. 1. 5A and 5B are top views showing a state when a C cassette is loaded in a cassette identification and detection mechanism according to an embodiment of the present invention. FIG. 6 is a front view of the cassette identification and detection mechanism shown corresponding to FIGS. 5A and 5B. FIGS. 7A and 7B are right side views of the cassette identification and detection mechanism shown corresponding to FIGS. 5A and 5B, respectively. FIGS. 8A and 8B are left side views of the cassette identification and detection mechanism shown corresponding to FIGS. 5A and 5B, respectively. FIG. 9 is a top view showing a state in which the drawer lever stand, the drawer lever, and the tray slider are integrated. FIG. 10 is a top view showing the tray. FIG. 11 is a top view showing the sub-slider. FIG. 12 is a top view showing the main slider. FIG. 13 is a top view showing a state in which a standard cassette is pulled out to the front of the main body in a conventional cassette identification and detection mechanism. FIG. 14 is a top view showing a state when a standard cassette is loaded in a conventional cassette identification and detection mechanism. FIG. 15 is a right side view of the cassette identification detection mechanism shown corresponding to FIG. 14. FIG. 16 is a left side view of the cassette identification detection mechanism shown corresponding to FIG. 14. FIG. 17 shows that in the conventional cassette identification detection mechanism, C
FIG. 3 is a top view showing the state when the cassette is pulled out to the front of the main body. FIG. 18 shows that in the conventional cassette identification detection mechanism, C
FIG. 3 is a top view showing the state when the cassette is loaded. FIG. 19 is a right side view of the cassette identification and detection mechanism shown corresponding to FIG. 18. FIG. 20 is a left side view of the cassette identification and detection mechanism shown corresponding to FIG. 18. In the figure, 1 is a tray, 2 is a C cassette, 32 is a standard cassette, 33 is a tape type detection switch, 34 is an accidental erasure prevention detection switch, 35 is an accidental erasure prevention detection lever,
36 is a tape type detection lever. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] (1) Either of the first and second cassettes of different sizes is selectively loaded into the recording/reproducing position of the magnetic recording/reproducing device, and at least one type of the loaded cassette is identified and detected. A cassette identification and detection mechanism for a magnetic recording and reproducing device, comprising: a cassette type identification and detection means that can abut an identification portion provided on the first cassette and identifies and detects the cassette type depending on the presence or absence of the abutment; a cassette identification detection mechanism, comprising: an intervening means that can abut an identification part provided on the second cassette, moves depending on the presence or absence of the abutment, and has a part that abuts the cassette type identification detection means; .