آليات الحركة في اجهزة التسجيل - تسجيل الشريط والاسطوانات المجسمة .. الإلكترونيات

Motion mechanisms in recording devices - Tape recording and stereoscopic discs.. Electronics

Motion mechanisms in recording devices

Figure (193) shows one of the types of motion mechanisms used in recording devices (and there are other methods used), and it consists of a single motor that performs all the required functions. During recording or listening, the rollers press the tape to keep it in contact with the rotating rotary cylinder and to rewind it at a regular speed on the empty reel after passing in front of the recording head, and at the same time, the roller on which the tape is located rotates at the required speed and to move the tape in the opposite direction (in the case of multi-track tapes), the movement of the motor is reversed and the movement wheel converts the tape winding process in the opposite direction. In the case of rapid winding of the tape, the pressure rollers pull away from it, so it becomes free to move and the reel can rotate at maximum speed. In addition, the speedometer is moved by belts that take their movement from one of the two rollers, in order to determine the recording locations and different topics.

Figure (194) shows a mechanism for changing the recording speed, which allows it to be increased when recording spoken topics to increase the time that the recording tape can hold. There are several buttons used to control the operation of the motor, some of which are designated to change the polarity of the motor according to the required speed (195). It is noted that each button, after being released, returns to its position and remains in it by means of a spring latch designed for this purpose, and shared by all buttons. Such keys can raise or lower the recording head, just as they can change the direction of the motor's movement, etc. There are many electromagnetic devices included in the recording device, including the coil used in the process of attracting the pressure rollers and saving the tape on the rotating cylinder (196). It is worth noting that the tape becomes free to move when the current passing through this coil is absent.

193 - Tape push mechanism.

194 - Two-speed push mechanism.

195 - Control by pressing the buttons and recording heads for the two-track tape.
196 - Tape pulling mechanism using an electric file.