JPS6055901B2 - magnetic tape device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic tape device such as a VTR.

Conventionally, this type of magnetic tape device often uses a method in which a magnetic tape is loaded around a tape guide drum containing a built-in magnetic head, and then a pinch roller is pressed against a capstan using a solenoid or the like to drive the magnetic tape at a constant speed. The disadvantages were that the structure was complicated and the number of parts increased.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a magnetic tape device that has a small number of parts and can control the traveling drive of a magnetic tape with a simple structure.

An embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic plan view showing the state of the magnetic tape device in this embodiment before tape loading, and FIG. 2 is a schematic plan view showing the state after tape loading.

In FIG. 1, 1 is a board of the device, and 2 is a cassette. This cassette 2 houses a supply hub 4 and a take-up hub 5 on which a magnetic tape 3 is wound.Furthermore, a tape pull-out member (described later) is inserted into the cassette 2 at the front end of the cassette 2. an opening 6 for insertion, an insertion hole 8 for the capstan 7, an opening 10 into which the recording/playback head 9 is inserted; an opening 12 into which the pinch roller 11 is inserted;
is provided. The magnetic tape 3 is configured to be transferred from the supply hub 4 to the take-up hub 5 while being guided by guide rollers 13 and 14. The capstan 7 is inserted into a capstan insertion hole 8 of the cassette 2, and is supported so as to be rotatable integrally with the flywheel 15.

Further, the capstan 7 is rotated in a predetermined manner by the rotational force of the capstan motor 17 being transmitted through the belt 16. The recording/playback head 9 is fixed to a playback operation member 18 and is provided so as to be able to come into contact with the magnetic tape 3 by operating the playback operation member 18 . The regeneration operation member 18 is provided with a pinch roller 11 rotatable about a shaft 19. The pinch roller 11 is biased to rotate clockwise by a spring 22 stretched between a pinch roller arm 20 and a spring pin 21.
The position is regulated by a stopper 23 provided in a part of the. 24 is a latch plate that can hold the regeneration operation member 18 in the operating position, and 25 is a latch plate biasing spring.

Reference numeral 26 denotes a stop operation member, which is configured so that the latch of the regeneration operation member 18 can be released by operating this.

The loading ring 27 is rotatably held at three points by rotatably provided pulleys 28a, 28b, and 28c.
They are interlocked.

A gear 29 rotationally driven by a loading motor (not shown) rotates the loading ring 27 to perform a loading ring/unloading operation. The loading ring 27 rotates around the tape guide drum 30, and the loading ring 27 includes guide pins 31a, 31b, 3 for winding the magnetic tape 3 around the tape guide drum 30.
1c and 31d are provided so as to be movable up and down.
The tape guide drum 30 has video signal magnetic heads 32a, 32b, and 32c for recording video signals on the magnetic tape 3 wound around the tape guide drum 30, or for reproducing video signals recorded on the magnetic tape 3. Built-in.
The sector gear 33 is rotatable about a shaft 34 embedded in the base plate 1, and a tension spring 35 is stretched between the sector gear 33 and the base plate 1, so that the sector gear 33 3
63 is applied with a counterclockwise rotational force about the shaft 34 as a fulcrum. Further, since the protrusion 33a of the sector gear 33 is provided so as to come into contact with the stopper pin 36 implanted in the loading ring 27, the position of the sector gear 33 is regulated by the five rotation positions of the loading ring 27. There is. Next, a mechanism for pulling out the magnetic tape 3 from the cassette 2 will be explained.

A driven gear 38 fixed to one end of a shaft 37 rotatably supported by a bearing (not shown) provided on the substrate 1 is provided so as to mesh with the four fan-shaped gears 33. axis 37
A main tape pull-out arm 39 is fixed to the other end,
A main tape pull-out pin 40 is provided at one end, and a tape guide pin 40a is installed at the other end. This main tape pull-out pin 40 is provided so that it can enter inside the cassette 2 further than the magnetic tape 3 when the cassette 2 is installed in the apparatus. On the other hand, a sub-tape pull-out arm 42 is provided which is rotatable around a support shaft 41 provided on the main tape pull-out arm 3 gate 9, and a sub-tape pull-out pin 43 is implanted at the tip of the sub-tape pull-out arm 42. . Similar to the main tape pull-out pin 40, the sub-tape pull-out pin 43 pulls out the magnetic tape 3 when the cassette 2 is installed in the device.
It is provided so that it can fit inside the cassette 2. A tension spring 44 is stretched between the main tape pull-out arm 39 and the sub-tape pull-out arm 42, and biases the main tape pull-out pin 40 and the sub-tape pull-out pin 7 43 in a direction toward each other. . Furthermore, a part of the sub-tape pull-out pin 43 and the main tape pull-out arm 3
The two tape pull-out pins 40 and 43 are positioned relative to each other by engagement with the protruding portion 39a at the tip of the tape pull-out pin 9. Next, to explain the continuous operation of this device, by operating the playback operation member 18, the recording/playback head 9 enters the opening 10 and comes into contact with the magnetic tape 3 in the cassette 2, and the pinch roller 11 is pressed against the capstan 7, which is stopped rotating, via the magnetic tape 3. At the same time, the loading motor starts rotating and the gear 29 is rotationally driven, so that the loading ring 27 meshed therewith starts rotating in the direction of arrow A. As the loading ring 27 rotates, the sector gear 33 whose position has been restricted by the stopper pin 36 starts rotating in the direction of arrow A. As the sector gear 33 rotates, the driven gear 38 rotates in the direction of arrow B, and at the same time, the main tape pull-out arm 39 rotates in the direction of arrow B. As the main tape pull-out arm 39 rotates, the auxiliary tape pull-out arm 42 provided on the main tape pull-out arm 39 also rotates, and the main tape pull-out pins provided at the tips of both arms 39 and 42 respectively. 40 and the auxiliary tape pull-out pin 43, the magnetic tape 3 is pulled out of the cassette 2 through the state shown by the one-dot chain line in FIG. 1, and the main tape pull-out arm 39 further rotates. As a result, the pin 45 provided on the sub-tape pull-out arm 42 comes into contact with the stopper 46 provided on the board 1, and the rotation of the sub-tape pull-out arm 42 is stopped even though the main tape pull-out arm 39 is in the middle of rotation. movement is regulated. On the other hand, the main tape pull-out arm 39 can rotate in accordance with the rotation of the sector gear 33 even after the rotation of the sub-tape pull-out arm 42 is restricted. Rotate until it comes into contact with and stops rotating, that is, to the position shown in Figure 2,
The magnetic tape 3 pulled out from the cassette 2 is 1 in Figure 2.
A table loop 48 shown by a dotted chain line is formed. Further, as the loading ring 27 rotates, the guide pins 31a and 3 provided on the loading ring 27 are
1b, 31c, and 31d enter the inside of the table loop 48 while moving up and down in order, and continue rotating along the outer periphery of the tape guide drum 30 to a predetermined position while a part of the table loop 48 is hooked. When loading is completed, a protrusion 49 provided on a part of the loading ring 27
When the switch 50 is pressed, the switch 50 becomes 0N.
Then, the capstan motor 17 starts and the capstan 7 starts rotating, and the tape guide pin 40a provided on the main tape pull-out arm 39 guides the tape exit of the cassette 2, and the magnetic tape 3 runs at a predetermined speed, and the tape guide drum 30
Image signal magnetic heads 32a, 32 provided inside the
Recording and reproduction of video signals are performed by the recording and reproducing heads 9 and 32c, and recording and reproduction of audio signals are performed by the recording and reproducing head 9. As described above, according to this embodiment, by operating the playback operation member 18, the pinch roller 11 is pressed against the capstan 7 via the magnetic tape 3, and at the same time, the loading ring 27 is rotated to press the tape guide drum 30.
When the magnetic tape 3 is wrapped around the loading ring 27 and the loading ring 27 is rotated to a predetermined loading completion position and the loading completion detection switch (switch 50) is turned on, the capstan motor 17 is energized and the capstan 7 is rotated. The drive of the magnetic tape 3 can be controlled with an extremely simple structure in which the magnetic tape 3 is run at a constant speed.

Further, after the loading is completed, a solenoid for pressing the pinch roller 11 onto the capstan 7 is no longer necessary, the number of parts is reduced, and an inexpensive device can be provided. Moreover, since the capstan 7 is stopped while the magnetic tape 3 is being loaded, the magnetic tape 3 does not run unnecessarily, and the capstan 7 rotates at the same time as loading is completed, making it easy to locate the beginning of the magnetic tape 3, etc. It also has the advantage of being easy to perform. As described above, the magnetic tape device of the present invention has a small number of parts and
This has the effect of being able to control the running and rowing of the magnetic tape with a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing the state before loading when a cassette is installed in a magnetic tape device which is an embodiment of the present invention, and FIG. FIG. 2 is a schematic plan view showing a state in which the magnetic tape is being loaded and running around the periphery of the magnetic tape. 2... Cassette, 3... Magnetic tape, 7... Capstan, 11... Pinch roller, 17... Capstan motor, 18... Playback operation member, 27... Loading ring, 30...Tape guide drum, 3
2a, 32b, 32c... Magnetic head for video signal (magnetic head), 39... Main tape pull-out arm, 42
... Sub tape drawer arm, 50... Switch (
Loading completion detection switch).

Claims (1)

[Claims] 1 Contains a playback operation member, a capstan, a motor for driving the capstan, a pinch roller that is interlocked with the playback operation member and presses against the capstan via the magnetic tape of the cassette, and at least one magnetic head. a tape guide drum, a tape loading means for winding a magnetic tape in a cassette around the tape guide drum in conjunction with the playback operation member, and detecting completion of loading by the tape loading means and supplying power to the motor. A magnetic tape device equipped with a loading completion detection switch.