JPH0237010B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an autoloading mechanism for a tape cassette, and more particularly, to an autoloading mechanism that takes safety measures for automating the lead-in or eject operation of a tape cassette.

For example, in a front loading type cassette deck, when installing a tape cassette, first open the lid that covers the front of the cassette storage space using the eject button, drop the cassette inside the lid, and then close the lid by hand to put the cassette in place. However, the hand-pressing operation of this lido has now been automated by button operation. However, with this type of conventional autoloading mechanism, if a finger gets caught between the lid and the cassette storage space during loading, the lid drive motor continues to be energized until the lid is completely closed. However, there were drawbacks such as the unavoidable burnout of the coil due to overload, and the risk of injury to fingers that were caught. Furthermore, even during ejection, if the front surface of the lid is blocked by an obstacle, a similar problem occurs with the lid drive motor.

Furthermore, the conventional autoloading mechanism described above is only related to the automation of loading, so if you want to play, record, fast forward, or rewind after loading is complete, you have to operate the corresponding operation button. Therefore, in order to load the cassette and actually set the tape to the desired state, two buttons, the lead-in button and the above-mentioned operation button, must be operated in succession, which makes the operation extremely difficult. There were disadvantages such as being troublesome. Similarly, if you want to stop the running tape and take out the cassette, you have to press the stop button and then the eject button, making the operation very cumbersome.

The present invention eliminates the above-mentioned drawbacks, and the entire loading operation from the lead-in of the tape cassette to the start of playback is performed by operating the playback button, and the tape is automatically ejected after the tape has stopped running by operating the eject button. If the lead-in operation is not completed within a predetermined time, the lid drive motor is reversed and driven in the direction of opening the lid. An object of the present invention is to provide an autoloading mechanism for a tape cassette that prevents loading.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view of an embodiment of a cassette deck to which the autoloading mechanism of the present invention is applied, Fig. 2 is an exploded perspective view of an embodiment of the autoloading mechanism, and Fig. 3 is a loading control circuit. 1 shows a schematic circuit configuration diagram of an embodiment.

In Fig. 1, the cassette deck 1 is a front-loading type, and all the operation buttons are electronic. , the lead-in operation can be followed by recording, playback, fast-forwarding, and rewinding operations as a series of operations.
It also has the feature that by pressing the eject button 6, the eject operation can be performed as a series of operations following the stop of tape running.

As shown in FIG. 2, the loading mechanism 7 is attached to a frame 9 and a motor chassis 10 built into the back of the lid 8, and is used to open and close the lid 8,
1 braking, lifting and lowering the head chassis 12, pressing the pinch roller 13, etc., are performed according to a predetermined sequence by a total of four cam grooves, two each carved on the front and back of the loading control cam wheel 14. controlled. The cam wheel 14 is driven to rotate in forward and reverse directions by a loading motor 16 provided separately from the direct drive type capstan drive motor 15, and is designed to rotate approximately 360 degrees from the start of loading to the completion of loading. .

Now, the operation when loading from a state where the lid 8 is open (ejected state) will be explained, taking as an example the case where the playback button 3 is pressed. First, the loading motor 16 rotates forward by pressing the playback button 3, and the rotation is transmitted to the cam wheel 14 via the pulley 17 and pinion 17a. A pin 18 embedded in one end of the swing lever 18 is inserted into the cam groove for opening and closing the lid carved on the back surface of the cam wheel 14.
a is engaged, and as the cam wheel 14 rotates, the other end of the swing lever 18 rotates clockwise. An engaging element 19a of a slider 19 provided on the left end of the frame 9 so as to be movable up and down is engaged with the fork-shaped portion at the other end of the swinging lever 18, and as the swinging lever 18 rotates clockwise, The slider 19 that is not present is displaced upward.

Here, a pin 20a implanted in the upper arm of a doglegged arm 20 that is pivotally supported on the side plate of the frame 9 is engaged with the slider 19, and a long hole 20b at the lower end of the doglegged arm 20 is engaged with the slider 19. A pin 8a on the side of the lid 8 is engaged. Therefore, as the slider 19 rises, the lower end of the doglegged arm 20 is retracted to the rear, and the lid 8 rotates in the closing direction around the pivot pins 8b at the lower ends on both sides.

As will be described later, the time required from when the lid 8 begins to close until it is completely closed is always compared with the regular required time, and if it deviates from this required time by more than a certain time interval, the lead-in operation may be hindered. Once heated, the loading motor 16 is driven in the reverse direction and returns to the ejected state.

By the lead-in operation, the reel shaft 11a is inserted into the reel of the tape cassette, and the capstan 21, which is coaxial with the capstan drive motor 15, is inserted into the capstan insertion hole of the tape cassette. This capstan 21 is held by a sleeve 22 that passes through a circular hole 9a of the frame 9.
Another circular hole 9b of the frame 9 is paired with 2.
A sleeve 23 through which the cam wheel 14 is inserted is provided coaxially with the cam wheel 14.

When the lead-in operation is thus completed, the lever 24, which is pivoted at a portion slightly below the center of the frame 9, is rotated counterclockwise by the pin 24a that engages with the cam groove on the front surface of the cam wheel 14. As a result, the other engaging pin 24b of the lever 24 pushes the head chassis 12 upward, so that the recording/playback head 25 and erasing head 26 of the head chassis 12 come into contact with the tape of the tape cassette.

In this way, when the head chassis 12 rises until the heads 25 and 26 come into contact with the tape, the pins 27a that engage with another cam groove on the front surface of the cam wheel 14 are used to connect the heads 25 and 26 to each other along the lower edge of the frame 9. Two interlocking slide bars 2
7 and 28 are displaced left and right. As a result, the two left and right pinch rollers 13 come into pressure contact with the tape in relation to the displacement of the slide bars 27 and 28, and the right pinch roller 13 presses the tape against the capstan 21.

Note that, unlike the single capstan system as in this embodiment, if a double capstan system is adopted in which the capstan is also inserted into the sleeve 23 that passes through the cam wheel 14, the tape is attached to the left side of this capstan. It will also be pinched between the pinch rollers 13.

When the tape is pressed against the capstan 21 in this manner, the capstan drive motor 15 and the reel stand drive motor 28 on the upper part of the frame 9 are activated, and the tape runs at a predetermined reproduction speed.

Therefore, as can be seen from the series of operations so far, all loading operations from the lead-in of the tape cassette to the start of playback can be performed by simply operating the playback button 3 after dropping the tape cassette into the lid 8 which is in the ejected state. is done continuously. Therefore, unlike the conventional autoloading mechanism, there is no need to press the lead-in button, complete the lead-in, and then press the play button, which requires the button to be operated twice.

Note that when fast forwarding or rewinding is performed from the ejected state, the reel stand drive motor 28 is started following the lead-in operation to perform fast forwarding or rewinding of the tape, but in this case, after the lead-in operation is completed, The loading motor 16 is stopped before the head chassis 12 is raised and the pinch roller 13 is pressed against the tape, so that the tape runs under a light load without contacting the heads 25, 26 or the pinch roller 13.

Furthermore, if the eject button 6 is pressed while the tape is running, the eject operation is automatically performed after the tape has stopped running.Therefore, just like in the conventional autoloading mechanism, the tape cannot be stopped by pressing the stop button. If you press the eject button after stopping, there is no need to press the button twice.

Here, the starting/stopping or forward/reverse rotation of the loading motor 16 is controlled by the motor chassis 1.
This is performed by a control circuit 30 on a substrate 29 fixed to the 0 rear plate. The control circuit 30 is electrically connected to the aforementioned operation buttons 2 to 6 as well as a potentiometer 31 for detecting the rotation angle of the cam wheel 14 and the like. The potentiometer 31 is provided below the pulley 17 as shown in FIG. Rotate.

In this way, the rotation angle of the cam wheel 14 is
The loading motor 16 stops when the cam wheel 14 rotates a predetermined angle according to the tape running mode detected by the potentiometer 31 and supplied to the control circuit 30 and specified by the operation buttons 2 to 6. do.

Here, the control circuit 30 includes a comparison circuit 30a that measures the time required for the lead-in operation and the eject operation, that is, the time required for opening and closing the lid 8, and compares it with a preset normal required time;
A reversing circuit 30 that reverses the loading motor 16 when the opening/closing time of the lid 8 becomes longer than the required time by a certain time interval as a result of the comparison in step a.
b is provided.

Therefore, even if, for example, a finger is accidentally caught in the lid 8 during the lead-in operation and the lid 8 does not close completely, the reversing circuit 30b operates to close the lid 8 once. The lid 8 can be opened safely by switching to the eject operation. Therefore, injury to the fingers can be prevented, and burnout of the rotor coil, stator coil, etc. of the loading motor 16 can be prevented.

Similarly, if the front of the lid 8 is blocked by an obstacle when the eject button 6 is pressed, the reversing circuit 30b is activated to prevent the lid 8 and loading motor 16 from being forced. It is possible to prevent the inconvenience caused by

As explained above, according to the tape cassette autoloading mechanism of the present invention, operating the playback button performs all loading operations from tape cassette lead-in to playback, and operating the eject button performs tape running. The eject operation is automatically performed following the stop, and the loading motor is reversed if the lead opening/closing time associated with tape cassette lead-in or eject is longer than the preset normal required time. Since the lead-in operation of the tape cassette and the operation of stopping tape running are performed by operating the playback button and eject button, button operations can be simplified, and there is no need to worry about getting your fingers caught on the lid during the lead-in operation. If the lid is accidentally ejected, or if the lid is blocked by an obstacle during the ejecting operation, the lid and loading motor can be operated safely, thereby reducing the loading operation. This has excellent effects such as making safety measures associated with automation more reliable.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of a cassette deck to which the autoloading mechanism of the present invention is applied;
FIG. 2 is an exploded perspective view of one embodiment of the autoloading mechanism, and FIG. 3 is a schematic circuit diagram of one embodiment of the loading control circuit. 1... Cassette deck, 7... Loading mechanism, 8... Lid, 14... Cam wheel, 16...
... Loading motor, 30 ... Control circuit, 3
0a... Comparison circuit, 30b... Reversing circuit, 31...
...potentiometer.

Claims (1)

[Claims] 1 A mechanism that performs the entire loading operation continuously from the lead-in of the tape cassette to the start of playback simply by operating the playback button, and a mechanism that automatically ejects the tape after it stops running when the eject button is operated. a lid that is opened and closed by the power of a loading motor to lead in or eject a tape cassette; a comparison circuit that compares the time required for opening and closing the lid with a preset regular opening and closing time; The tape cassette autoloading system is provided with a reversing circuit that reverses the loading motor when the opening/closing time of the lid is longer than the normal opening/closing time as a result of comparison by a comparison circuit. mechanism.