JPS581848A - Magnetic recording and reproducer - Google Patents

Abstract

PURPOSE:To realize a simple and compact structure for a magnetic recorder/ reproducer and to secure the application for the large capacity recording purpose, by drawing a magnetic tape out of a cassette by means of two draw-out arms to make the tape touch a reproducing head and then detecting the tension change of the magnetic tape to control the revolution of a motor. CONSTITUTION:A cassette 1 is loaded by connecting the reels 5 and 6 to the reel driving motors 7 and 8 respectively. When a magnetic tape 30 is drawn out, the chain wheels 10 and 14 are driven via a chain 18 upon driving an arm driving motor 17. Thus the draw-out arms 2 and 3 move to the working positions shown by the chain lines and stop there. During this shift of the wheels 10 and 14, the tape 30 is drawn out and touches a recording/reproducing head 4 to perform the recording and reproduction. The difference of tension of the tape 30 which is caused by the difference of speed between the motors 7 and 8 is detected by a potentiometer 13. This detected difference of tension is fed back to the motors 7 and 8 to perform the revolution control of the motors.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing device that combines the advantages of open reel tape, which allows for large-capacity recording, and the advantages of cassette tape, which has good operability and can be easily installed in a shed. I'll go.

Conventional magnetic recording and reproducing devices include open-reel type devices wrapped with 1/2 inch wide magnetic tape, and 1/2 inch wide magnetic tapes.
A cassette type with an 8-inch wide magnetic tape wound around it is mainly used, but the former has the disadvantage that the magnetic tape recording and reproducing device is large and complicated, and requires a separate magnetic tape storage. It has the disadvantage that it cannot be used for large-capacity recording because its storage capacity is small.

The present invention is intended to solve the above-mentioned six drawbacks, and aims to provide a high-speed, low-cost magnetic recording and reproducing device that has a small and simple structure and can be used for large-capacity recording.

The invention will now be described in detail in conjunction with the drawings.

FIG. 1 is a plan view showing an embodiment of the magnetic recording/reproducing apparatus according to the present invention, and FIG. 2 is a front view of the same. In the figure, 1 is a cassette, 2
, 3 is the drawer arm, 4 is the record.

This is the playhead.

A tape feed reel 5 and a tape take-up reel 6 are provided within the cassette 1. Each reel 5.6 of this cassette 1 is directly connected to a tape reel drive motor 7.8 provided in the device when the cassette 1 is set in the device as shown. . The magnetic tape 3o used in the cassette 1 has a width of 1/2 inch.

The drawer arm 2 is fixed to the shaft 9 and the shaft 9
One end is rotatably supported by the rotating plate 11, and the rotating plate 11
is fixed to the shaft of the chain wheel 1o. A roller guide 12 for drawing out the tape is fixed to the tip of the drawer arm 2, and the other end of the shaft 9 is connected to a potentiometer 13. A fixed portion of this potentiometer 13 is attached to the rotary plate 11. The base of the drawer arm 30 is connected via a roller bearing to the tip of an arm 15 fixed to the shaft of the chain wheel 14, and a roller guide 16 for tape drawer is fixed to the tip of the drawer arm 3. The chain wheel 10.14 is driven by the arm drive motor 17.
8 for synchronous rotation. A tension spring 19 is provided between the drawer arm 2 and the rotary plate 11, so that the arm 2 is always pressed against the pin 31 on the rotary plate 11. Further, a spring (not shown) is provided between the pull-out arm 3 and the arm 15, and the roller guide 16 presses the rail 2o when the pull-out arm 3 is biased by this spring.

The cassette 1 is connected to the tape reel drive motor 7 as described above.
．． The reels 5 and 6 are connected to the cassette 8, and the reels 5 and 6 are installed in the positions shown in the figure.When this cassette is installed, the respective separation arms 2 and 3 are positioned at the retracted positions shown by the solid lines in Figure 1. , the rotating plate 11 is engaged with the collar 21, and each roller guide 12.16 is located within the cassette 1 as shown in FIG.

At this time, the microswitch 22 indicates that the drawer arm 2 is (
A) is detected.

If the magnetic tape 30 in the cassette 1, which is wound around the tape feed reel 5 and whose tip end is connected to the winding reel 6, is to be drawn out, the motor 17 is activated. When the motor 17 operates, each chainwheel 10, 14
is driven by the motor 17 via the chain 18 to
Rotating counterclockwise in the figure, each separating arm 2, 3 begins to move toward the first operative position indicated by the chain line. When each pull-out arm 2.6 reaches the operating position indicated by the chain line and the rotating plate 11 is locked to the stopper 23, the microswitch 24 detects that the pull-out arm 2 is in the position (b) and turns the motor 17 on. The operation is stopped, and each arm 2, 5 stops at this operating position. During this movement of each arm 2, 3, the magnetic tape 30 is pulled out from the cartridge set 1 by each roller guide 12.16 to the position shown by the dotted line in FIG. Tape withdrawal is completed when it comes into contact with .

In this state, the motor 7.8 is driven to take up the magnetic tape onto the take-up reel 6 while recording and reproducing.

In this case, it is necessary to control the rotational speed of the motor 7.8 as the winding of the magnetic tape by the winding reel 6 progresses. The potentiometer 16 detects the difference in the tension of the magnetic tape caused by the speed difference between the speed of the magnetic tape being wound up and the speed of the magnetic tape being wound up.
Since the shaft 9 rotates clockwise in the figure, this rotation is detected by the potentiometer 13) and is fed back to the motor 7.8. Note that 32 is a stopper for locking the drawer arm 2.

The rotation angles α and β of each arm 2.degree. 6 during the above-mentioned magnetic tape drawing operation will be the same angle if the chain wheels 10.14 have the same number of teeth.

Since the magnetic recording/reproducing device according to the present invention is configured as described above, it is possible to simplify the structure, reduce the size, and reduce the cost to 1/2 compared to the conventional open-reel type device. By using an inch-wide magnetic tape, it can be used for large-capacity recording. It also operates reliably and can be used at high speeds.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the magnetic recording/reproducing apparatus according to the present invention, and FIG. 2 is a front view of the same. In the figure, 1 is a cassette, 2
．． 3 is the drawer arm, 4 is the record. A reproduction head, 5 a tape feed reel, 6 a tape drive motor, 22 and 23 microswitches, and 60 a magnetic tape. Patent applicant Fujitsu Aji 42 Company representative Patent attorney Hisashi Tamamushi Gobu (3 others) Figure 2

Claims (1)

[Scope of Claims] Two tape reel drive motors, a pair of reels, and a magnetic tape fed from the one reel and wound onto the other reel, each of which drives each of the reels. A cassette that is connected to and removably set in the reel driving Tanabata, and information is recorded on the magnetic tape. A recording and reproducing head for reproducing is synchronously driven by the same drive source and positioned at a retracted position and an operating position, and when moving from the retracted position to the operating position, the magnetic tape is pulled out from the cassette and the recording, A magnetic recording and reproducing apparatus comprising: two pull-out arms that are brought into contact with a reproducing head; and a tape tension detector that detects changes in the tension of the magnetic tape and controls the rotation of each of the tape reel driving motors.