JPH0726920U - Quick reverse sensor mounting device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent damage to the quick reverse sensor. [Construction] A quick reverse sensor 2 is arranged in a chassis 1B so as to be vertically movable, and is attached to a moving portion 12. When the rotary lever 16 rotates counterclockwise, the moving portion 12 is driven upward by the action piece 18 thereof. If the cassette holder 1A is closed without the DCC cassette tape 4 being inserted into the cassette holder 1A and the DCC cassette tape 4 is not inserted to a predetermined position, the hub 42 of the cassette half 40 abuts on the take-up reel 1C.
A cannot close any more. Therefore, since the cassette half 40 does not contact the drive piece 19 of the rotary lever 16 lower than the take-up reel 1C, the rotary lever 16 is held as it is and the quick reverse sensor 2 is also held as it is. This makes it possible to prevent the cassette half 40 from colliding with the quick reverse sensor 2 and being damaged.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a quick reverse sensor mounting device suitable for use in a cassette tape recorder.

[0002]

[Prior art]

 As shown in FIG. 5, for example, a cassette tape recorder 1 for a DCC (digital compact) cassette tape includes a rotary cassette holder 1A for simplifying the structure. On the other hand, some of such cassette tape recorders 1 have a quick reverse function.

As is well known, the quick reverse function is a short function when the recording portion of the magnetic tape, that is, the coating portion of the magnetic recording material is completed while the magnetic tape is running for recording or reproducing. By reversing the tape over time, the loss of information is reduced as much as possible so that the recording or reproducing process can be continued for a long time.

As a means for detecting the end of the recording portion of the magnetic tape, a cylindrical quick reverse sensor 2 is used as shown in FIG. The quick reverse sensor 2 is fixed to the chassis 1B of the cassette tape recorder 1, and when the cassette holder 1A is closed, the positioning hole 41 provided in the cassette half 40 of the DCC cassette tape 4 loaded in the cassette holder 1A is closed. Inserted in. The positioning hole 41 is provided at the same position as that for the C cassette tape, and is used for positioning when both the DCC cassette tape 4 and the C cassette tape are loaded in the cassette tape recorder.

In the C cassette tape, the magnetic head for reverse is relatively small, and since the cassette half has no shutter, the exposed surface of the magnetic tape becomes large. Therefore, the magnetic head and the quick reverse sensor 2 are integrated. However, the cassette tape recorder 1 for DCC cassette tape 4 requires a large magnetic head for eight tracks, and since it has a shutter, the exposed area of the magnetic tape is large. Becomes smaller. Therefore, it is difficult to arrange the quick reverse sensor 2 in the immediate vicinity of the magnetic head, and the quick reverse sensor 2 is inserted into the positioning hole 41. A take-up reel 1C rotatably attached to the chassis 1B is inserted into the tape take-up hub 42 of the DCC cassette tape 4.

When the cassette holder 1A is completely closed, the quick reverse sensor 2 is inserted into the positioning hole 41, and the detection surface of the quick reverse sensor 2 and the magnetic tape 43 face each other. When the reproducing process or the recording process is performed and the magnetic tape 43 runs, and the end of the recording portion of the magnetic tape 43 reaches the quick reverse sensor 2, the recording portion and the non-recording portion of the magnetic tape 43 are separated. The difference in light reflectance is detected by the quick reverse sensor 2. As a result, the end of the recording portion is detected, and the running of the magnetic tape 43 is reversed in about 0.2 seconds thereafter.

[0007]

[Problems to be solved by the device]

 By the way, the quick reverse sensor 2 has a relatively high height so that the end of the recording portion of the magnetic tape 43 can be reliably detected. In addition, when the rotatable cassette holder 1A is closed, the positioning hole 41 of the DCC cassette tape 4 draws an arcuate path as shown in FIG. 6, so that the positioning hole 41 is inserted into the quick reverse sensor 2 immediately before it is inserted. The gap a between the peripheral wall of the positioning hole 41 and the quick reverse sensor 2 becomes narrower than when the positioning hole 41 is completely inserted into the quick reverse sensor 2. Therefore, the quick reverse sensor 2 is considerably thin so that the positioning hole 41 is surely inserted into the quick reverse sensor 2.

However, no matter how much the positioning hole 41 is easily inserted into the quick reverse sensor 2 as described above, the DCC cassette tape 4 may be completely removed due to, for example, a foreign object inside the cassette holder 1A. If the cassette holder 1A was not inserted and the cassette holder 1A was closed as it was, the cassette half 40 collided with the quick reverse sensor 2 and in some cases the quick reverse sensor 2 was damaged. Such a problem is a common problem with C (compact) cassette tapes.

Therefore, the present invention solves the above-mentioned problems, and it is possible to prevent the quick reverse sensor from being damaged even when the cassette tape is not completely inserted into the cassette holder. A reverse sensor mounting device is proposed.

[0010]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the present invention, in a quick reverse sensor mounting device that detects the end of the recording portion of the magnetic tape in the cassette half loaded in the rotatable cassette holder, the quick reverse sensor is installed in the vertical direction. When the cassette holder is closed, the rotating end of the magnetic tape is installed so that when the cassette holder is closed, it is rotated by the cassette holder or cassette half to raise the quick reverse sensor. It is characterized in that the quick reverse sensor is raised and inserted into the hole of the cassette half provided at the position where it can be detected.

[0011]

[Action]

 As shown in FIG. 1, a quick reverse sensor 2 is arranged in a chassis 1B so as to be vertically movable, and is attached to a moving portion 12. When the rotary lever 16 rotates counterclockwise, the moving portion 12 is driven upward by the action piece 18 thereof. Now, as shown in FIG. 4, when the cassette holder 1A is closed without the DCC cassette tape 4 being inserted into the cassette holder 1A due to dust being contained therein, the hub 42 of the cassette half 40 is rewound. The cassette holder 1A cannot be closed any more by contacting the 1C.

Therefore, since the cassette half 40 does not contact the driving piece 19 of the rotary lever 16 lower than the take-up reel 1C, the rotary lever 16 is held as it is and the quick reverse sensor 2 is also held as it is. As a result, it is possible to prevent the cassette half 40 from colliding with the quick reverse sensor 2 and being damaged.

[0013]

【Example】

 Next, an embodiment of a mounting device for a quick reverse sensor according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the construction of a mounting device 10 for a quick reverse sensor according to the present invention. This quick reverse sensor mounting device 10 is applied to a cassette tape recorder for recording or reproducing a DCC (digital compact) cassette tape 4 as shown in FIG.

The DCC cassette tape 4 has a size and a positioning hole so that the tape recorder for loading the DCC cassette tape 4 can use a normal C (compact) cassette tape. As shown in FIG. 3A, a magnetic tape 43 is stored inside the cassette half 40. The leader tape of the magnetic tape 43, that is, the non-recording portion is, for example, transparent or can be distinguished from the recording portion such as a magnetic material not coated.

On the front surface side of the cassette half 40, a transparent window 44 for confirming the winding state of the magnetic tape 43, and a recess for putting a finger when the DCC cassette tape 4 is taken in and out of a carrying case. 45 and a knurled portion 46 for preventing fingers from slipping when the DCC cassette tape 4 is taken in and out of the cassette holder 1. Further, a recess 48 is provided for attaching a label 47 on which a user's memorandum can be written.

A shutter 50 that straddles the front and back of the cassette half 40 is fitted in a guide groove 49 provided at the front end of the cassette half 40 so as to be movable along the longitudinal direction of the cassette half 40. . The shutter 50 is always biased in the closing direction. The front end surface of the shutter 50 is provided with two openings 51 and 52, and the magnetic tape 43 is exposed from here when the shutter 50 is opened. At the end of the guide groove 49, a small groove 53 is provided for inserting a pin or the like for opening the shutter 50.

Further, as shown in FIG. 1B, two hub holes 54 for exposing the hub 42 of the magnetic tape 43 are provided on the rear surface side of the cassette half 40, and these are used when the shutter 50 is closed. The round hole 54 is covered with the shutter 50. The shutter 50 has only one round hole 55. Then, when the shutter 50 is opened, the shutter 50 moves to the outside of the hub hole 54 on the left side in the drawing, and the round hole 55 is arranged at a position aligned with the hub hole 54 on the right side. As a result, the hub holes 42 on both sides are exposed.

On the front side of the cassette half 40, two recesses for inserting a capstan (not shown) of the cassette tape recorder 1 are provided. Further, on the front side of the cassette half 40, there are provided positioning holes 41 and 57 used for positioning when the DCC cassette tape 4 is loaded in the tape recorder. These positioning holes 41 and 57 are exposed when the shutter 50 is opened. In this example, the quick reverse sensor 2 is inserted into one of the positioning holes 41 as described later.

Now, in FIG. 1, a cassette holder 1A is rotatably attached to a chassis 1B of the cassette tape recorder 1 by a rotation shaft 1D. A take-up reel 1C and a magnetic head 1E are also attached to the front surface side of the chassis 1B. A guide hole 11 for the quick reverse sensor 2 is provided at a position facing the positioning hole 41 of the chassis 1B. Inside the chassis 1B, a moving portion 12 is attached by two guide rods 13 so as to be vertically movable. The moving portion 12 is provided with a projecting portion 14, and the upper side of the quick reverse sensor 2 standing on the upper surface side thereof is inserted into the guide hole 11. The moving portion 12 is constantly urged downward by the leaf spring 15, so that only the tip of the quick reverse sensor 2 projects to the surface of the chassis 1B.

A substantially V-shaped rotary lever 16 is rotatably attached by a rotary shaft 17 at a position separated from the quick reverse sensor 2 in the chassis 1 B by an appropriate distance. The tip of the action piece 18 on the right side of the rotary shaft 17 of the rotation lever 16 in the drawing is arranged below the protrusion 14 of the moving portion 12. Further, the drive piece 19 on the left side of the rotary shaft 17 of the rotary lever 16 projects outward from the opening 20 of the chassis 1B. The tip of the drive piece 19 is located on the left side of the take-up reel 1C and is sufficiently lower than the take-up reel 1C.

The shape and dimensions of the rotary lever 16 are such that when the tip of the drive piece 19 rotates to the same level as the surface of the chassis 1B, the tip of the action piece 18 pushes up the moving portion 12 and the quick reverse sensor 2 Is set to a height at which the end of the recording portion of the magnetic tape 43 can be detected. The action piece 18 of the rotary lever 16 is constantly urged downward by a tension spring 21.

When recording or reproducing the DCC cassette tape 4 with this cassette tape recorder 1, the DCC cassette tape 4 is loaded into the cassette holder 1A and the cassette holder 1A is closed. At this time, the shutter 50 (FIG. 2) of the DCC cassette tape 4 is opened by a lid opening mechanism (not shown).

Then, as shown in FIG. 3, immediately before the cassette holder 1 A is completely closed, the lower surface side of the cassette half 40 contacts the drive piece 19 of the rotary lever 16. When the cassette holder 1A is further rotated, the driving piece 19 is pushed down by the cassette half 40 and the rotary lever 16 is rotated counterclockwise. As a result, the action piece 18 linearly pushes up the moving portion 12, and the quick reverse sensor 2 moves upward in the guide hole 11 and is arranged at a predetermined position.

When the recording mode or the reproducing mode is set in this state, the magnetic tape 43 runs and the recording process or the reproducing process of information is performed. At this time, the recording portion of the magnetic tape 43 is in contact with the magnetic head 1E, and the light reflectance of the recording portion, that is, the portion coated with the magnetic recording material is measured by the quick reverse sensor 2 near the magnetic head 1E. It has been detected.

Then, when the non-recording portion where the magnetic recording material is not applied, for example, the transparent portion comes close to the magnetic head 1E after the recording portion is finished, the light reflectance of the non-recording portion is quick reverse. It is detected by the sensor 2. Thus, the end of the recording portion is detected by the difference between the light reflectance of the non-recording portion and the light reflectance of the recording portion, and the running of the magnetic tape is reversed in about 0.2 seconds to perform the recording or reproducing processing. Will be continued.

In this case, since the quick reverse sensor 2 is near the magnetic head 1E, the running of the magnetic tape 43 can be reversed immediately after the end of the recording portion of the magnetic tape 43 passes through the magnetic head 1E. It will be possible. Therefore, even when the magnetic tape 43 is inverted and the recording process or the reproducing process is performed, it is possible to significantly reduce the loss of information.

On the other hand, as shown in FIG. 4, for example, when dust is present in the cassette holder 1A, the DCC cassette tape 4 cannot be inserted to a predetermined position. In this case, the hub 42 of the DCC cassette tape 4 is displaced from the predetermined position. Therefore, if the cassette holder 1A is closed as it is, the peripheral edge of the hub 42 comes into contact with the peripheral side surface of the take-up reel 1C, and the cassette holder 1A is moved further It won't close. At this time, since the cassette half 40 is not yet in contact with the driving piece 19 of the rotary lever 16, the quick reverse sensor 2 is held at the original position. Therefore, the cassette half 40 is prevented from colliding with the quick reverse sensor 2 and being damaged.

In the above embodiment, the driving piece 19 of the rotary lever 16 is driven by the cassette half 40. However, the driving piece 19 may be driven by the lower end surface of the cassette holder 1A. Further, although the quick reverse sensor 2 is inserted into the positioning hole 41 in the above-mentioned embodiment, the quick reverse sensor 2 may be inserted into a hole which can face the magnetic tape 43 in addition to the above.

Further, in the above embodiment, the case where the present invention is applied to the cassette tape recorder for the DCC cassette tape has been described, but the present invention can also be applied to the cassette tape recorder for the C cassette tape. Is. In the C cassette tape, the thickness in the vicinity of the exposed portion of the tape is thicker than that of the DCC cassette tape. When the quick reverse sensor is fixed as in the past, the cassette half is quicker than the DCC cassette tape. Although it is easy to collide with the reverse sensor, the quick reverse sensor can be reliably prevented from being damaged by applying the present invention.

[0031]

[Effect of device]

 As described above, the present invention is equipped with a quick reverse sensor that can be moved up and down, and is provided with a rotary lever that is driven to rotate by the cassette holder or cassette half when the cassette holder is closed to raise the quick reverse sensor. When is closed, the quick reverse sensor is raised and inserted into the hole of the cassette half provided at the position where the end of the recording part of the magnetic tape can be detected.

Therefore, according to the present invention, even when the cassette tape is not completely inserted into the cassette holder and the cassette holder is closed, the cassette half may contact the rotating reel before contacting the rotating lever. Since the cassette holder will not close, the rotary lever will not be driven and the quick reverse sensor will not rise. This makes it possible to prevent the cassette half from colliding with the quick reverse sensor and being damaged. Also, by placing the quick reverse sensor inside the chassis when not in use, it is possible to prevent dust from adhering or other objects from colliding and being damaged. There is.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a tape recorder to which a quick reverse sensor mounting device according to the present invention is applied.

FIG. 2 is a configuration diagram of a DCC cassette tape 4.

FIG. 3 is a diagram illustrating a normal insertion state of a DCC cassette tape 4.

FIG. 4 is a diagram for explaining an erroneous insertion state of the DCC cassette tape 4.

FIG. 5 is a diagram illustrating a mounting state of a conventional quick reverse sensor 2.

FIG. 6 is a diagram illustrating a gap a between a conventional quick reverse sensor 2 and a positioning hole 41.

[Explanation of symbols]

 1 cassette tape recorder 1A cassette holder 1C take-up reel 1E magnetic head 2 quick reverse sensor 4 DCC cassette tape 12 moving part 16 rotary lever 17 rotary shaft 18 working piece 19 driving piece 40 cassette half 41 positioning hole 42 hub 43 magnetic tape 50 shutter

Claims (1)

[Scope of utility model registration request] 1. A quick reverse sensor mounting device for detecting an end of a recording portion of a magnetic tape in a cassette half loaded in a rotatable cassette holder, wherein the quick reverse sensor is vertically movable. A rotation lever is provided which is driven to rotate by the cassette holder or the cassette half to raise the quick reverse sensor when the cassette holder is closed. When the cassette holder is closed, the end of the recording portion of the magnetic tape can be detected. An apparatus for mounting a quick reverse sensor, wherein the quick reverse sensor is raised and inserted into a hole of the cassette half provided in the.