Advanced Printing Systems Front page EPM205-LV EPM205-HS Technical Reference EPM205 - Technical reference - Rev.
Advanced Printing Systems Preface · · · · · · · · This manual provides a complete technical information about EPM205 series, thermal line printer mechanisms. If not specified, the data of the present specification are valid for all the types of printers, when the specification of the printer is different, according to the type, its specification is described with annotation. For customized printers, A.P.S. supplies documentation in addition to the present specification.
Advanced Printing Systems TABLE OF CONTENTS Sec. Page 1. INTRODUCTION ......................................................................................................................... 4 1.1. EPM205 FEATURES .................................................................................................................. 5 2. GENERAL CHARACTERISTICS................................................................................................... 6 3. THERMAL HEAD AND PRINTING CONFIGURATION ...
Advanced Printing Systems 1. INTRODUCTION The EPM205 is a 2 inch, from 2.7V to 8.5V, Easy Loading Printing Module with an integrated paper roll housing. The EPM module consists of a set of mechanical and electrical parts, these parts have been designed to have an high grade of integration between Printer and Housing. The sections that form the EPM module are described in the following image. 1. 2. 3. 4. 5. 6. 7.
Advanced Printing Systems 1.1. EPM205 features · Patented Easy loading and Easy Door Opening System · Ultra compact design · Up to 80 mm/s printing speed · Ultra light (95g) · High resolution printing (8 dots/mm) · Life of 100 million pulses, 50 km · Low consumption · Low noise due to its technology (thermal) EPM205 - Technical reference - Rev.
Advanced Printing Systems 2.
Advanced Printing Systems 3. THERMAL HEAD AND PRINTING CONFIGURATION 3.1. Outlines Heat element structure: Number of heat elements: Heat element pitch: Average resistance: 3.2. 2 heaters/dot 384 dots 0.125 mm LV - 123 Ω ±4% HS - 176 Ω ±4% Thermal head electrical characteristics Item Print voltage Symbol Min. Typ. VH - 5.0 2.7 0.8 x Vdd 0 4.45 30 30 10 100 200 50 300 - 5.00 1.
Advanced Printing Systems 3.3. Timing chart The following chart gives the timing for driving the print-head: tw CLK Clock tsetup DI thold DI Data In tsetup LAT thold LAT \Latch tsetup STB tw LAT Strobe tdo Driver Out EPM205 tdo - Technical reference - Rev.
Advanced Printing Systems 3.4. Maximum conditions at 25°C Item Supply energy Print cycle Supply voltage Logic voltage Head temperature Number of dots to be energized simultaneously1 Maximum conditions LV HS 0.26 0.2 2.5 1.25 7.2 8.5 7 65 192 Unit mJ/dot ms/line V V °C dots Notes: · If energy applied to one dot, exceed the maximum value indicated on the above table, the print quality of this dot may be definitively affected (usually makes a “light” print-out). · If print cycle is less than 2.
Advanced Printing Systems 3.6. Heating time calculation The following formula allows to calculate the heating time Ton depending on driving voltage VH: (N * Rcom + Rav + Ric + Rl )2 E0 = E0 * T on = 2 P0 V H * Rav Where: E0 is the nominal energy VH is the driving voltage Rav is the average resistance N is the number of dots energized simultaneously Rcom is the common resistance (0.05 Ω) Ric is the driver saturated resistance (10 Ω) Rl is the lead resistance (10 Ω) 3.7.
Advanced Printing Systems 3.8. · · Print position of the data The first bit of data (dot 1) entered is the first bit of data printed (FIFO), left side of TPH, top view (gearing side of the printer). STB 1 to STB 6 are driving one sixth of the print-head, starting from dot 1. EPM205 - Technical reference - Rev.
Advanced Printing Systems 3.9. Operating precautions 1- When performing continuous printing, the supply energy should be reduced so that the substrate temperature, monitored through the thermistor, will remain below 65°C. 2- All strobes signals must be disabled during the power and logic voltage ON/OFF sequence. 3- Do not touch the connector pins with naked hands.
Advanced Printing Systems 4. STEPPER MOTOR 4.1. Stepper motor Timing The paper feed pitch for stepper motor is 2 steps for one dot-line (0.125 mm). For good print quality it is advised to keep the current into the windings between two successive dot-lines. The timing diagram is then as follows: PHASE 1 PHASE 2 PHASE 3 PHASE 4 DOTLINE 1 2 3 STEP There are four different positions for the stepper motor.
Advanced Printing Systems 4.2. Paper feed speed versus voltage The following table gives the maximum paper feed speed versus the stepper motor voltage and duty cycle for the stepper motor driving. Motor voltage (V) 2.7 3 3.3 3.6 4 4.5 5 5.5 6 6.5 7 7.5 8 8.
Advanced Printing Systems 5. HOW TO OPTIMIZE SPEED, CONSUMPTION AND MAX. PEAK CURRENT The printing speed is always a compromise between 3 parameters : · · · Paper feed speed (function of voltage). Head activation time Ton (function of voltage and temperature). Maximum peak current available (function of voltage and maximum number of dots simultaneously activated and directly related to power supply capabilities).
Advanced Printing Systems 6. SENSORS 6.1. Door open In order to optimize and decrease the number of elements of the EPM, the opto sensor performs dual functions - door open and end of paper detection. The shape and distance from the opto sensor to the paper is designed in a way that as soon as the door is opened, the distance between the paper and the sensor increases, and this causes the end of paper sensor to trigger. 6.2.
Advanced Printing Systems 7. PIN OUT ASSIGNMENT One flexy cable is gathering all signals. The pitch at the end of the flexy is 1mm.
Advanced Printing Systems 8. MECHANICAL & HOUSING 8.1. Overall dimensions and fixing points See attached drawings for overall dimensions and recommended screws. 3D-IGES file, for mechanical details, is available upon request, ask APS for more information. The mechanism has to be fixed using the fixing points provided for this purpose. There are two possibilities: · Using points 1-2-4-5 (all of them simultaneously). · Using points 3-4-5 (all of them simultaneously).
Advanced Printing Systems 8.2. Mounting precautions Orientation according to figure A-B is to be preferred, reliability and life tests have been based only according to this orientation. Alternatively, it is possible to choose different orientation angles as shown in figures C-D-E. EPM205 - Technical reference - Rev.
Advanced Printing Systems Mounting precautions (continued) EPM205 - Technical reference - Rev.
Advanced Printing Systems Mounting precautions (continued) EPM205 - Technical reference - Rev.
Advanced Printing Systems 9. HANDLING THE EPM 9.1. How to open the cover group Lift the Lever, acting as indicated by the arrow, until the Cover Group is released from its locking position. To avoid damages to the Lever do not use excessive force. EPM205 - Technical reference - Rev.
Advanced Printing Systems 9.2. How to load paper rolls Step 1 Step 2 EPM205 - Technical reference - Rev.
Advanced Printing Systems 9.3. How to close the Cover Group correctly Press on both sides of the Cover Group (simultaneously) YES Alternatively: Press on the middle area of Cover Group (near the paper exit). YES EPM205 - Technical reference - Rev.
Advanced Printing Systems How to close the Cover Group correctly (Continued) Do not close the Cover Group pressing only on one side. NO 9.4. How to cut the paper Pull the paper towards the Tear Bar from one side to the other. EPM205 - Technical reference - Rev.
Advanced Printing Systems 10. ORDERING CODE Type Ordering code EPM205 Low Voltage (from 2.7V) EPM205 High Speed (80mm/s) EPM205 EPM205-LV EPM205-HS - Technical reference - Rev.
