JPS63100657A - Rotating head type recording and reproducing device - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a rotary head type recording and reproducing device used in video recorders, audio recorders, and the like.

BACKGROUND OF THE INVENTION In recent years, rotating head devices have been used not only for video but also for audio.

An example of the above-mentioned conventional rotary head type recording/reproducing device will be described below with reference to the drawings.

FIG. 2 shows a top view of a conventional rotary head type recording/reproducing apparatus which is generally implemented. In Figure 2, 1
is a tape guide drum, 2 and 3 are reel stands, 4 is the outer periphery of the tape, 6 is the tape, 6 is a loading guide roller, 7 is an inclined guide pin, 8 is a loading lock, and the loading guide roller 6 and the inclined guide pin 7 are installed. 9 is a capstan, and 1o is a pinch roller between which the tape 6 is held and driven at a relatively slow constant speed. 11 is a tension control arm, 12 is a tension detection bin, 13 is a rotating shaft of the tension control arm, 14 is a spring that biases the tension control arm 11 in a counterclockwise direction, and 15 is a brake band, which is a braked part of the reel stand 2. It is wrapped around and applies braking. 16 is loading block 8
17 is a chassis.

The operation of the rotary head type recording/reproducing apparatus configured as described above will be explained below.

FIG. 2 shows a state in which a cassette (not shown) is placed in a playing position, a tape 6 is pulled out by a tape loading block 8, and is wound around a guide drum 1 for recording or playback operation.

The tension of the tape coming out from the supply reel stand 2 is wound around the tension detection bottle 12, and the tension is balanced with the counterclockwise rotating force of the spring 14. When the tension increases, the tension control arm 11 is balanced at a position slightly rotated clockwise, and the increase in tape tension is canceled out to weaken the contact of the brake band 15. Conversely, when the tape tension decreases, the brake is applied strongly to increase the tape tension.

Problems to be Solved by the Invention However, in the above configuration, it is necessary to move the tension detection bin into and out of the cassette (not shown) along with the tape in conjunction with tape loading and unloading, and for this purpose, the tension detection arm is required. The fluctuation of the tape tension obtained after control is quite large due to the fact that the position of the rotation axis is limited, the sensitivity is affected by not being able to wrap enough tape around the tension detection bottle, etc. However, there was a problem in that a constant tension could not be obtained from the beginning to the end of the tape.

In view of the above-mentioned problems, the present invention provides a rotary head type recording/reproducing apparatus having a new tape tension control means that is flexible in terms of design.

Means for Solving the Problems In order to solve the above-mentioned problems, the rotary head type recording/reproducing apparatus of the present invention includes a tape guide drum having a rotary head, and a tape in a cassette wound around the tape guide drum. a tension control arm that is rotatably supported on the chassis and has a tape tension detection member at its tip, and a sulphurek shoe that abuts the tape loading guide roller at an intermediate portion; The apparatus includes a biasing means for biasing the tension control arm toward the tape loading guide roller.

Effects of the present invention With the above-described configuration, the tension control arm can be engaged with and detached from the tape simply by keeping it on standby at the tape loading position of the loading guide roller.
In addition, by arbitrarily selecting the ratio of the distances from the rotational support shaft to the tension detection bin and the prexigny, it is possible to obtain stable tape tension with little change.

EXAMPLE A rotary head type recording/reproducing apparatus according to one embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a top view of essential parts of a rotary head type recording/reproducing apparatus according to an embodiment of the present invention. In Figure 1, 1
8 is a tension control arm, and 19 is a tension detection roller which is added to the tip of the tension control arm 18.

A brake shoe 2o is made of felt or the like and is attached to the middle part of the tension control arm 18 so as to press against the tape 5 that is wound around the loading guide roller 6 and runs. 21 is a tension control arm 180
It is a pivot shaft and is installed on the chassis 17. Reference numeral 22 denotes a chevron-shaped cam portion formed at the tip of the tension control arm 18, which is used to collide with the moving loading block 8 and automatically temporarily displace it during tape loading and unloading. A spring 23 urges the tension control arm 18 counterclockwise. 24 is a shift rod for releasing the tension control arm from the operating position;
In order to avoid being a load when fast forwarding or rewinding the tape in the tape loading state, the tension control arm is pressed and rotated in the direction of the hour hand.

Since it is configured as above, tape loading,
When the loading block 8 moves along the guide hole 16 during unloading, the chevron-shaped cam portion 22 at the base of the loading guide roller 6 and the tip of the tension control arm
It automatically returns temporarily when it collides with the side of the

As described above, according to this embodiment, the ratio of the distances from the rotation support shaft 21 to the tension detection roller 19 and the brake shoe 20 is arbitrarily selected, and
A desired tape tension can be obtained by selecting the coefficient of friction between the tape 5 and the force of the spring 23.

Although a roller is used as the tension detection member in the embodiment, it goes without saying that a pin-shaped member that does not rotate may also be used.

Effects of the Invention As described above, the present invention includes a tape guide drum having a rotating head, a tape loading guide roller that guides the tape in a cassette when it is wound around the tape guide drum, and a rotatable shaft mounted on a chassis. A tension control arm that is supported and has a tape tension detection member at its distal end, a brake shoe that abuts the tape loading guide roller at the intermediate portion, and a biasing means that biases the tension control arm toward the tape loading guide roller. By providing this, it is possible to realize a rotary head type recording and reproducing device that automatically engages and disengages in conjunction with tape loading and unloading, and has a new tension control means using a tape loading guide roller, with a relatively large degree of freedom in design. can.

[Brief explanation of the drawing]

FIG. 1 is a top view of essential parts of a rotary head type recording/reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a top view of a general conventional rotary head type recording/reproducing apparatus. 6...Loading guide roller, 8...
- Loading block, 11.18...Tension control arm, 19...Tension detection roller, 20...Brake shoe.

Claims (2)

[Claims] (1) A tape guide drum with a rotating head, a tape loading guide roller that wraps the tape in the cassette around the tape guide drum and guides its travel, and a tape tension detection roller that is rotatably supported on the chassis and has a tape tension sensor at its tip. The present invention is characterized by comprising: a tension control arm having a brake shoe in the middle that contacts the tape loading guide roller; and a biasing means for biasing the tension control arm toward the tape loading guide roller. A rotating head type recording and reproducing device. (2) A patent claim characterized in that a contact portion is provided on the loading block and the tension detection arm for temporarily retracting the tension control arm when the tape loading block moves during tape loading and tape unloading. The rotary head type recording/reproducing device according to item 1.