Stepper motor in typewriter application - Database & Sql Blog Articles

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Considering factors such as speed of action, load size, price, and life, typewriters generally use stepper motors or DC motors. DC motors are characterized by high responsiveness, ease of control, and high efficiency. The stepper motor is characterized by low cost and high life of the control circuit. When the stepping motor is used in a typewriter, the action of each basic function uses an independent motor-driven mechanism, so that the load inertia can be reduced, the function can be simplified, the printing precision can be improved, the typing can be reliable, the freedom, the function and the like.

The movable type printer includes two motors for paper conveying mechanism and space, and a movable type selection mechanism that uses a dot matrix according to a typing method.

1. Stepper motor for movable type selection mechanism

The number of movable type of the movable wheel is matched with the resolution of the stepping motor, and the required movable type is quickly transported to the position of the typing hammer for positioning, and the stepping motor requires high-speed position positioning, and requires high positioning accuracy and damping characteristics. The damping characteristics make the movable type stable during typing and improve the quality of typing. In order to reduce the time of the action, the rotation command of the stepping motor makes the typing selection not exceed 180°. The action of this stepping motor is frequent reciprocating motion.
Nowadays, inkjet printers are often used, and the production of such typewriters has declined, using motor VR type or HB type stepping motors.

2. Stepper motor for moving type

If the stepper motor is used to transport the movable matrix, the position of the vertical and horizontal characters is determined to be smaller than the stepping motor step angle error, and the dynamic torque is large. The stepper motor can use a HB type or a low cost PM type stepping motor.

3, paper feed stepper motor

Typewriter paper feed In addition to large typewriters, PM type stepper motors are the choice of almost all typewriters. The overall processing speed of the typewriter determines the paper feed operation time. Since the mechanism is the smallest of the typewriters, the characteristics and low cost of the PM type stepping motor are applicable to the mechanism.