The **WSP-14B-R/E** is a professional-grade, high-speed thermal printer mechanism manufactured by **Woosim Systems**. It is designed for integration into portable medical devices, industrial handheld terminals, and mobile POS systems. --- ### 1. Key Technical Specifications Below is a breakdown of the primary electronic and physical characteristics: | Feature | Specification | | :--- | :--- | | **Printing Method** | Direct Thermal Line Printing | | **Print Width** | 104mm (4 inches) | | **Resolution** | 203 DPI (8 dots/mm) | | **Print Speed** | Up to 50mm/sec | | **Operating Voltage** | 3.5V to 8.5V DC | | **Interface** | Parallel or Serial (Logic Level) | | **Head Life** | 50km of paper travel | --- ### 2. Core Electronic Components The mechanism functions through the coordination of several internal electronic subsystems: #### A. Thermal Print Head (TPH) * **Heating Elements:** Contains a line of 832 miniature resistors. When electricity passes through them, they generate heat to darken the thermal paper. * **Driver ICs:** Integrated circuits on the head assembly that decode the data stream and trigger the specific resistors needed for each character or image line. #### B. Stepper Motor Drive * The paper is moved by a precision **bipolar stepper motor**. * This requires a motor driver circuit (usually an H-bridge) to pulse the motor coils in sequence, ensuring the paper moves at a constant speed synchronized with the TPH firing. #### C. Sensors To ensure operational stability, the unit includes: * **Paper-Out Sensor:** Typically a photo-interrupter that detects the presence or absence of paper. * **Thermistor:** A temperature sensor mounted on the TPH to prevent overheating and to adjust the "burn time" (pulse width) based on ambient temperature. --- ### 3. Connection and Integration The WSP-14B-R/E is usually interfaced via a Flexible Printed Circuit (FPC) cable. Designers must implement a control board that handles: 1. **Bit-mapping:** Converting text/graphics into a serial bit stream for the TPH. 2. **Power Management:** Providing high peak current (often several Amps) during the heating cycle while maintaining stable logic voltage. --- ### 4. Typical Applications * **Medical:** Portable ECG/EKG monitors. * **Logistics:** Large format shipping labels from handheld devices. * **Law Enforcement:** Field citations and ticket printing.