SU86374A1 - Combined magnetic recording and sound reproducing apparatus - Google Patents

Description

One of the drawbacks in the prior art magnetic recording apparatus is the structural complexity of the tape output a.

In the proposed apparatus, this disadvantage is eliminated by the fact that the rollers of the carrier cassettes for the tape are fed alternately to the rotating faceplate of the player along a straight line, which improves the design and ensures operational durability.

FIG. I shows a general view in two projections; in fig. 2 and 3 - separate nodes of the proposed apparatus.

The plate / sleeve 2 is reinforced, serving as a bearing for axis 3, pressed into the disk 4 (Fig. 1). The height of the disk is adjusted by the screw 5. The rotation is transmitted to the disk by a DAM type electric motor through an intermediate roller 6 to the inside of the disk. The motor is attached to the board using an elastic suspension. The motor shaft has a sleeve-nozzle, the calculated diameter of which is determined depending on the diameter of the inner bead of the disk so that the gear ratio between the nozzle and the disk provides 78 rpm of the disk.

The main drum element for the tape is a drum 7, which is freely worn on the disk axis over the plate and secured against the axis with an ordinary ball lock or spring lock. In order to ensure better adhesion of the tape with the toned drum, the bead of the latter is equipped with a rubber bandage. The diameter of the drum is a calculated one, which gives a circumferential speed of 78 mm / sec at 78 revolutions of the disk.

The correct direction of the film is attached by the guide roller S. A single magnetic head 9 is placed between the guide roller and the drum, which records, plays and erases the film.

Under the board there is a W strip with J1 axes attached to it. The rewind roller sits freely on the left axis, and the face of the recording is on the right axis. 13. The bar can move along its axis, and the rewind roller is pressed against the disk while the bar moves to the right and the recording roller while moving to the left. The guides during this movement are the clamps 14 and 15 (Fig. 2). The translation from one position to another is carried out by a translation mechanism, the device of which is shown in sections BB (Fig. 2) or B-B (FPG 3). When moving the switch from the switch 16 along the slot, which is in the board, the clamp / 7 presses on the shank of the bar 10 and, thus, leads the bar (Fig. 2). The limiter of movement is the size of the steam in the board; a lock of certain provisions - cuts in it; near which the corresponding inscriptions are placed: "on," stop, "rewind (Fig. 1).

The recording and rewinding rollers 72 are provided with rubber bands, providing better adhesion of the rollers to the outer rim of the disc when they are in contact. On top of the rollers, cassettes 18 are placed on which the film is wound (Fig. 1). The left cassette cannot be rotated relative to the rewind roll that is provided with a pin. During rotation, the rollers are retarded due to the friction of the filter / I laid between them and the thrust washer.

The device works on a standard tape, a width of 8-6.5 mm. Bandwidth frequencies up to 5000 hertz. Recording speed 210 mm1sek. Continuous playback time 18-20 zhyn. Rewind time - 3-4lshch.

During recording and playback, the tape cassette 18 is put on the rewind roller 12, the switch knob 16 is turned to the on position. At the same time, the strip 10 is shifted to the extreme left position and the side of the recording roller 13 comes into contact with the outer side of the disc 4. When the tape is filled, the latter from the left cassette 18 is directed through the roller 8, the magnetic head 9 and the drum 7 to the right cassette 18, where it is fixed. The motor then turns on. The disc and top drum begin to rotate. The drum-drum drives the tape at a constant linear speed, while the tape is unwound from the left reel. The angular velocity of the left reel (rewind roller and cassette connected to it) will be variable, ensuring at any moment the constancy of the linear speed of the winding tape. The necessary tension of the tape in front of the tone drum is achieved by frictional friction of roller 12 of Fils 19.

In order to ensure a constant linear speed of the tape, it is necessary that the angular speed of the cassette decreases all the time, otherwise the tape will be dragged through the drum and the so-called "float sound" will occur.

In this design, the linear speed of the tape during winding is achieved due to frictional slippage of the cassette relative to the recording roller as the winding diameter increases, and the friction force between the cassette and the recording roller is less than the force of friction of the tape along the drum, which excludes its dragging. Mechanical filter functions are performed by a disk. Switching off the tape mechanism is made by moving the shift knob to the "stop" position.

When rewinding, the tape is removed from the drum and the shift knob is set to the “rewind” position. In this case, the bar occupies the extreme right position, and a rewind roller 12 is pressed against the disk, which begins to rotate with the cassette 18 associated with it and rewinds the tape from the right reel. The burr of the roller 13 of the filz 19 provides the belt tension necessary for tight winding, and also brakes the right reel when it stops. Switching off, as before, is made by moving the shift knob to the position

STOP.

In the “stop” position, the cassettes do not overlap the disc, which makes it easier to remove and put gramophone records on it.

All details of the proposed apparatus are simple in design and are designed for production under conditions of mass production by the method of stamping and casting under pressure.

Subject invention

A combined magnetic recording and reproducing apparatus, in which the player uses a faceplate player, a drum drum on its axis, due to the fact that the rollers carrying the tape cassettes are alternately fed to the rotating plate of the player my line, which ensures simplicity of design and ease of operation.

Fig 2