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Summary of Contents for Seiko SII LTP02-245-13
- Page 1 LTP02-245-13 THERMAL PRINTER MECHANISM TECHNICAL REFERENCE U00131701401...
- Page 2 Copyright © 2013-2014 by Seiko Instruments Inc. All rights reserved. Seiko Instruments Inc. (hereinafter referred to as "SII") has prepared this manual for use by SII personnel, licensees, and customers. The information contained herein is the property of SII and shall not be reproduced in whole or in part without the prior written approval of SII.
- Page 3 PREFACE This technical reference (hereinafter referred to as "manual") describes the specifications and basic operating procedures for the LTP02-245-13 thermal printer mechanism (hereinafter referred to as "printer"). "CHAPTER 1 PRECAUTIONS" describes safety, design, and handling precautions. Read it thoroughly before designing so that you are able to use the product properly.
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Page 4: Table Of Contents
TABLE OF CONTENTS CHAPTER1 PRECAUTIONS SAFETY PRECAUTIONS..................1-2 DESIGN AND HANDLING PRECAUTIONS ............1-3 1.2.1 Design Precautions ..................1-3 1.2.2 Handling Precautions ..................1-5 1.2.3 Precautions on Discarding ................1-6 CHAPTER2 FEATURES CHAPTER3 SPECIFICATIONS GENERAL SPECIFICATIONS ................3-1 PRINT CONFIGURATION..................3-3 STEP MOTOR ....................... - Page 5 CHAPTER4 CONNECTING TERMINALS RECOMMENDED CONNECTOR FOR EXTERNAL CIRCUITS ......4-1 CONNECTING TERMINALS................. 4-1 CHAPTER5 PRINT DRIVE METHOD MOTOR AND THERMAL HEAD DRIVE METHOD ..........5-1 THERMAL HEAD DIVISION DRIVE METHOD............. 5-3 PRECAUTIONS FOR PRINT DRIVE ..............5-4 CHAPTER6 OUTER CASE DESIGN GUIDE FIXING THE PRINTER MAIN BODY ..............
- Page 6 FIGURES Figure 3-1 Print Dot Pitch .................... 3-3 Figure 3-2 Print Area ....................3-3 Figure 3-3 Sample Drive Circuit .................. 3-5 Figure 3-4 Input Voltage Waveforms for the Sample Drive Circuit ......3-6 Figure 3-5 Motor Start/Stop Timing Chart ..............3-7 Figure 3-6 Thermal Head Block Diagram..............
- Page 7 TABLES Table 3-1 General Specifications ..................3-1 Table 3-2 General Specifications of the Step Motor .............3-4 Table 3-3 Excitation Sequence ..................3-6 Table 3-4 Maximum Motor Drive Pulse Rate ..............3-8 Table 3-5 Acceleration Steps ..................3-10 Table 3-6 Maximum Continuous Drive Time and Drive Ratio........3-11 Table 3-7 Drive Time and Paper Length at Temperature Rise 50°C......
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Page 8: Chapter1 Precautions
CHAPTER 1 PRECAUTIONS Read through this manual to design a product and to operate the printer properly. Pay special attention to the precautions noted in each section for details. Information contained in this manual is subject to change without notice. For the latest information, contact our sales representative. -
Page 9: Safety Precautions
1.1 SAFETY PRECAUTIONS Follow the precautions listed below when designing your product for using safely. Include any necessary precautions into your operation manual and attach warning labels to your products to ensure safe operation. Precautions to prevent the thermal head from overheating When the thermal head heat elements are continuously activated by a CPU or other malfunction, the thermal head may overheat and may cause smoke and fire. -
Page 10: Design And Handling Precautions
1.2 DESIGN AND HANDLING PRECAUTIONS To maintain the primary performance of the printer and to prevent future problems from occurring, follow the precautions below. 1.2.1 Design Precautions Apply power in the following manner: At power on : (1) Vdd → (2) Vp At shut down : (1) Vp →... - Page 11 To prevent degradation in the print quality due to the backlash of the paper drive system, feed the thermal paper for 48 steps or more at the initialization, at a time after setting/releasing the platen unit, a time after feeding the thermal paper backward and a time after cutting with a paper cutter. ...
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Page 12: Handling Precautions
1.2.2 Handling Precautions Incorrect handling may reduce the efficiency of the printer and cause damage. Handle the printer with the following precautions. Also, include any necessary precautions so that users handle the printer with care. Using anything other than the specified thermal paper does not guarantee print quality and life of the thermal head. -
Page 13: Precautions On Discarding
The printer is not waterproof and drip proof. Prevent contact with water and do not operate with wet hands as it may damage the printer or may cause a short circuit or fire. The printer is not dust proof. Never use the printer in a dusty place, as it may damage the thermal head and paper drive system. -
Page 14: Chapter2 Features
CHAPTER 2 FEATURES The printer is a compact printer that adopts a thermal line dot printing method. It can be used with measuring instruments and analyzer, a POS, a communication terminal device, or a data terminal device. The printer has the following features: ... -
Page 15: Chapter3 Specifications
CHAPTER 3 SPECIFICATIONS 3.1 GENERAL SPECIFICATIONS Table 3-1 lists the general specifications of the printer. Table 3-1 General Specifications (1/2) Items Specifications Printing method Thermal line dot printing method Total dots per line 384 dots Printable dots per line 384 dots Simultaneously activated dots 45 dots Resolution... - Page 16 (2/2) Items Specifications Operating temperature range -10°C to 50°C (Non condensing) 40℃85%RH 45℃64%RH 50℃52%RH Operating humidity range Temperature(℃） Storage temperature range -20°C to 60°C (Non condensing) Activation pulse 100 million pulses or more Life span resistance (at 25°C and Abrasion rated energy) 50 km or more resistance...
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Page 17: Print Configuration
3.2 PRINT CONFIGURATION Figure 3-1 shows print dot pitch. Figure 3-2 shows print area. 48mm (384dot) 0.125mm 0.125mm Figure 3-1 Print Dot Pitch mm(Paper Width) 5 mm 48 mm(Printing Width) 5 mm Figure 3-2 Print Area... -
Page 18: Step Motor
3.3 STEP MOTOR 3.3.1 General Specifications Table 3-2 shows general specifications of the step motor. Table 3-2 General Specifications of the Step Motor Item Specifications Type PM type step motor Drive method Bipolar chopper drive Excitation 1-2 phase 8.3 Ω/phase 10% Winding resistance per phase Motor drive voltage Vp: 5.5 V to 9.5 V... -
Page 19: Sample Drive Circuit
3.3.2 Sample Drive Circuit Figure 3-3 shows a sample drive circuit. 0.1μF 10μF VREF REG5 0.1μF REG1 IN1A OUT1A IN1B OUT1B IN2A OUT2A IN2B OUT2B ATT2 ATT1 RNF1 RNF2 1.33Ω±1% 1.33Ω±1% CHOP 1.33Ω±1% 1.33Ω±1% 220pF PGND *: Recommended motor driver : LV8711T (SANYO) Figure 3-3 Sample Drive Circuit... -
Page 20: Excitation Sequence
3.3.3 Excitation Sequence Drive the motor with 1-2 phase excitation. One step of the motor drive signal feeds the paper 0.03125 mm. One dot line is consisted of 4 steps. When the voltage signal shown in Figure 3-4 is input to the motor drive circuit shown in Figure 3-3, the printer feeds the paper in the normal direction when the motor is excited in order of step 1, step 2, step 3, step 4, step 5, step 6, step7, step 8, step 1, step 2, . -
Page 21: Motor Start/Stop Method
3.3.4 Motor Start/Stop Method Refer to the timing chart in Figure 3-5 when designing the control circuit or software for starting and stopping the motor. Also note the following precautions: (1) Start step To start the motor from the pause (no excitation) state, shift the motor to the sequence of print step after exciting the same phase as that of the stop step for the first acceleration step time of the acceleration step. -
Page 22: Motor Drive Method
3.3.5 Motor Drive Method Drive the motor by the following methods. (1) Motor drive pulse rate During paper feeding, the motor should be driven lower than the value obtained by equation (1). Equation (1): = Vp × 534 - 1339 (pps) Maximum motor drive pulse rate at Vp (pps) However, 3200pps max. - Page 23 (2) Motor speed control When driving the motor, the acceleration control is required to maintain the paper feed force of start up. If acceleration of the motor does not perform correctly, the motor may not be able to rotate normally if it has a heavy workload.
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Page 24: Table 3-5 Acceleration Steps
Table 3-5 Acceleration Steps Drive Pulse Drive Pulse Number of Step Time Number of Step Time Rate Rate Steps (s) Steps (s) (pps) (pps) Start 4291 2270 4291 2294 2652 2317 2048 2341 1719 2363 1507 2386 1357 2409 1243 2431 1153 2453... -
Page 25: Table 3-6 Maximum Continuous Drive Time And Drive Ratio
(3) Preventing Overheat To prevent the motor from overheating, the maximum continuous drive time and drive ratio are limited. Table 3-6 shows the Maximum Continuous Drive Time and Drive Ratio of the motor per print within 1m. Follow Table 3-6 shown below to set drive time and a pause time of the motor. Table 3-7 and Figure 3-8 show Drive Time and Paper Length at Temperature Rise of 50ºC and 75ºC. -
Page 26: Table 3-7 Drive Time And Paper Length At Temperature Rise 50°C
Table 3-7 Drive Time and Paper Length at Temperature Rise 50°C Motor Drive Voltage Vp (V) Drive Pulse 9.5V≧Vp＞8.5V 8.5V≧Vp＞7.5V 7.5V≧Vp＞6.5V 6.5V≧Vp＞5.5V 5.5V Rate (m or (m or (pps) (m or (m or (m or longer) longer) longer) longer) longer) ～... -
Page 27: Table 3-8 Drive Time And Paper Length At Temperature Rise 75°C
Table 3-8 Drive Time and Paper Length at Temperature Rise 75°C Motor Drive Voltage Vp (V) Drive Pulse 9.5V≧Vp＞8.5V 8.5V≧Vp＞7.5V 7.5V≧Vp＞6.5V 6.5V≧Vp＞5.5V 5.5V Rate (m or (m or (pps) (m or (m or (m or longer) longer) longer) longer) longer) 12.1 12.9 12.1... -
Page 28: Motor Drive Precautions
3.3.6 Motor Drive Precautions Using the motor drive circuit other than the circuit shown in "Section 3.3.2 Sample Drive Circuit" may not ensure the specified efficiency. To prevent degradation in the print quality due to the backlash of the paper drive system, feed the thermal paper for 48 steps or more at the initialization, at a time after setting/releasing the platen unit, a time after feeding the thermal paper backward and a time after cutting with a paper cutter. -
Page 29: Thermal Head
3.4 THERMAL HEAD The thermal head consists of heat elements and a thermal head driver that drives and controls the heat elements. For the print data entered through the DI, print is "High" and non print is "low". The data from the DI is transferred to the shift register at the rising edge of the CLK signal. The data is stored into the latch register by making /LAT signal "Low"... -
Page 30: Print Position Of The Data
3.4.2 Print Position of the Data 384-bit data (#1 to #384) transferred through DI are printed when driving the printer as shown in Figure 3-7. Paper feed direction Paper Print surface Data in Data 1 2 3 4 5 6 382 383 384 ･... -
Page 31: Electrical Characteristics Of Thermal Head
3.4.3 Electrical Characteristics of Thermal Head Table 3-10 shows electrical characteristics of thermal head. Table 3-10 Electrical Characteristics of Thermal Head (Temperature : 25 C ) Vdd: 3.0 V to 3.6 V Rated Value Item Symbol Conditions Unit Min. Typ. Max. -
Page 32: Timing Chart
3.4.4 Timing Chart Figure 3-8 shows a thermal head drive timing chart. /LAT Figure 3-8 Thermal Head Drive Timing Chart 3.4.5 Thermal Head Heat Element Resistance Table 3-11 shows resistance of the thermal head heat element of the printer. Table 3-11 Thermal Head Heat Element Resistance Thermal Head Heat Element Resistance 162.0 Ω... -
Page 33: Maximum Current Consumption
3.4.6 Maximum Current Consumption Since the maximum current consumption may reach the values calculated using equation (2) when the thermal head is driven, the number of simultaneously activated dots should be determined not to exceed power supply capacity. Also, allowable current for the cable material and the voltage drop on the cable should be cared well. -
Page 34: Controlling The Activation Pulse Width For Thermal Head
3.5 CONTROLLING THE ACTIVATION PULSE WIDTH FOR THERMAL HEAD To execute high quality printing using the printer, the activation pulse width according to printer use condition must be used. Control printing with the activation pulse width calculated by the following sequence. Printing at too high voltage or too long activation pulse width may shorten the life of the thermal head. -
Page 35: Adjustment Of Thermal Head Resistance
3.5.3 Adjustment of Thermal Head Resistance The adjusted resistance "R" can be calculated using equation (5) to adjust the thermal head resistance as a voltage drop is caused by wiring resistance. Equation (5): × ) Thermal head heat element resistance 180 (Ω) Wiring resistance in the thermal head 9 (Ω) -
Page 36: Adjustment By Thermal Head Activation Pulse Cycle
3.5.6 Adjustment by Thermal Head Activation Pulse Cycle The thermal head activation pulse cycle coefficient "C" can be calculated using equations (8) as the printing density varies by the thermal head activation pulse cycle (equivalent for motor drive pulse rate). Equation (8): ... -
Page 37: Calculation Sample For The Activation Pulse Width
3.5.7 Calculation Sample for the Activation Pulse Width Table 3-13 lists the calculation samples of the activation pulse width calculated using equation (3) and the values obtained using equations (4) to (6) and (8). Table 3-13 Activation Pulse Width Unit : ms Motor Drive Pulse Rate [pps] [℃] 1280... -
Page 38: Temperature Characteristics Of Thermistor
3.5.8 Temperature Characteristics of Thermistor Calculate the resistance of the thermistor (R ) at the operating temperature T (C) using the following equation (9). Variation of resistance by temperature is shown in Figure 3-11 and Table 3-14. Equation (9): ... -
Page 39: Table 3-14 Temperature Characteristics Of The Thermistor
Table 3-14 Temperature Characteristics of the Thermistor Thermistor Temperature (C) Resistance (kΩ) 175.07 132.29 100.99 77.85 60.57 47.53 37.61 30.00 24.11 19.51 15.89 13.03 10.75 8.92 7.45 6.25 5.27 4.47 3.80 3.25 2.79 2.41 2.09 3-25... -
Page 40: Detecting Abnormal Temperature Of The Thermal Head
3.5.9 Detecting Abnormal Temperature of the Thermal Head To protect the thermal head and to ensure personal safety, abnormal temperature of the thermal head must be detected by both hardware and software as follows: (1) Detecting abnormal temperatures by software Design software that will deactivate the heat elements if the thermal head thermistor (TH) detects a ≤... -
Page 41: Out-Of-Paper Sensor
3.6 OUT-OF-PAPER SENSOR The printer has a built-in out-of-paper sensor (reflection type photo interrupter) to detect whether paper is present or not. An external circuit should be designed so that it detects output from the out-of-paper sensor and does not activate the thermal head and motor when there is no paper. Doing not so may cause damage to the thermal head or platen roller or shorten the life of the thermal head significantly. -
Page 42: Chapter4 Connecting Terminals
CHAPTER 4 CONNECTING TERMINALS 4.1 RECOMMENDED CONNECTOR FOR EXTERNAL CIRCUITS Use the recommended connectors listed in Table 4-1 to connect the printer connecting terminals firmly to the external circuits. Table 4-1 Recommended Connectors Number of Recommended Connectors Terminals MOLEX INC: 0545502471 (Right angle type : Top contact, Gold plated) 4.2 CONNECTING TERMINALS Figure 4-1 shows the terminal configuration of the connecting terminals and Table 4-2 shows terminal... -
Page 43: Table 4-2 Terminal Assignments Of The Connecting Terminal
Table 4-2 Terminal Assignments of the Connecting Terminal Terminal Terminal Function Name Output of the out-of-paper sensor (Photo-transistor collector) GND of the out-of-paper sensor (LED cathode, photo-transistor emitter) Power supply of the out-of-paper sensor (LED anode) Thermal head drive power supply Thermal head drive power supply Thermal head drive power supply Print data input (serial input) -
Page 44: Chapter5 Print Drive Method
CHAPTER 5 PRINT DRIVE METHOD 5.1 MOTOR AND THERMAL HEAD DRIVE METHOD The motor and the thermal head must be driven at the same time for printing. The printer uses the thermal head with heat elements which size is a half-dot size of the feed direction. One dot is, therefore, composed of two of the half dots. - Page 45 The divided printing method is described below (See Figure 5-1): (1) Pause state Inactivate the motor and always make DST signal of the thermal head "Low". (2) Start step Excite the motor by the same phase which is output just before the motor stops. (3) 1st dot line Activate the thermal head once every 2 steps of the motor drive signal.
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Page 46: Thermal Head Division Drive Method
5.2 THERMAL HEAD DIVISION DRIVE METHOD Logical blocks are predetermined so that number of dots of the physical block does not exceed the specified maximum number of the activating dots for every 1 dot line printing. Logical blocks are predetermined for every 1 dot line printing. -
Page 47: Precautions For Print Drive
5.3 PRECAUTIONS FOR PRINT DRIVE When using one division printing, a pause time between thermal head activations of the same heat element shall be secured more than 0.5ms. The number of the maximum thermal head division in a half dot line should be 9 or lower to maintain print quality. -
Page 48: Chapter6 Outer Case Design Guide
CHAPTER 6 OUTER CASE DESIGN GUIDE 6.1 FIXING THE PRINTER MAIN BODY 6.1.1 How to Mount the Printer Main Body Figure 6-1 shows dimensions for positioning and fixing the printer main body. Holes #1 to #2 must be used for positioning the printer main body. Design bosses on the outer case to position the printer main body for the positioning holes #1 and #2. -
Page 49: Recommended Screws
6.1.2 Recommended Screws JIS B1111 M2.0 cross-recessed pan head machine screw 6.1.3 Precautions for Fixing the Printer Main Body Prevent from excessive stress, deformation, and torsion when fixing the printer. Otherwise, poor printing quality, paper skewing, paper jamming, and noise during printing may be occur. ... -
Page 50: Fixing The Platen Unit
6.2 FIXING THE PLATEN UNIT Design the platen holder at the outer case to mount the platen unit. 6.2.1 Recommended Shape of the Platen Holder Figure 6-2 shows a recommended shape of the platen holder. Platen holder Platen unit 56.65 -0.2 53.05... -
Page 51: Dimensions For Positioning And Fixing The Platen Holder
6.2.2 Dimensions for Positioning and Fixing the Platen Holder Figure 6-3 shows the rotation center area of the platen holder which is critical for setting or releasing the platen unit. The shaded area is the position of platen holder rotation center 22.325 ±0.2 Unit : mm... -
Page 52: Precautions For Fixing The Platen Holder
6.2.3 Precautions for Fixing the Platen Holder Design the platen holder to avoid contacting with the thermal head. If you set the mounting part of the printer and rotation center part of the platen holder to the same base, accuracy for setting or releasing the platen unit will improve. -
Page 53: Connect The Printer To Frame Ground (Fg)
6.3 CONNECT THE PRINTER TO FRAME GROUND (FG) To prevent the thermal head from being damaged by static electricity, it is recommended that the printer mechanism is connected to frame ground (FG). 6.3.1 How to Connect the Printer to Frame Ground (FG) ... -
Page 54: Layout Of The Printer Mechanism And Thermal Paper
6.4 LAYOUT OF THE PRINTER MECHANISM AND THERMAL PAPER The printer mechanism can be laid out as shown below. Platen Platen holder Paper Roll Thermal head heat element Thermal head Printer mechanism Out-of-paper sensor Printer mounting plate Figure 6-5 Recommended Layout between the Printer and the Paper * The thermal paper feeding distance between the out-of-paper sensor and the heat element is approximately 5.0mm... -
Page 55: Where To Mount The Paper Holder
6.5 WHERE TO MOUNT THE PAPER HOLDER When designing the layout of the paper holder, note the followings. The recommended configuration of the paper holder is shown in Figure 6-6. Design the paper holder and the paper guide so that the thermal paper will be straight to the paper inlet port without any horizontal shifting and so that the center axis of the paper roll will be parallel to the printer when using paper roll. -
Page 56: Design Paper Eject
6.6 DESIGN PAPER EJECT 6.6.1 Design the Shape of the Paper Eject When designing the shape of the paper eject, note the followings. Design the shape of the paper eject so that stress is not applied to the thermal paper that comes out. -
Page 57: Mount The Paper Cutter
6.6.2 Mount the Paper Cutter Design paper cutter mounting position so the edge of the cutter blade does not contact with a platen unit when the platen unit is set and released. Use a well-cut cutter so that the thermal paper can be cut with less force than paper holding force. ... -
Page 58: Precautions For Designing The Outer Case
6.7 PRECAUTIONS FOR DESIGNING THE OUTER CASE The thermal paper with a small winding diameter may cause the paper jam in the printer main body and a gap between the printer mechanism and the outer case. If using such a thermal paper with the small diameter, verify the performance with your actual device. -
Page 59: Chapter7 External Dimensions
CHAPTER 7 EXTERNAL DIMENSIONS Figure 7-1 shows external dimensions of the platen unit. Figure 7-2 shows external dimensions of the printer. 64.55 Unit : mm General tolerance for dimensions : ± 0.5 Figure 7-1 External Dimensions of the Platen Unit... -
Page 60: Figure 7-2 External Dimensions Of The Printer Mechanism
2.1 ±0.05 (Paper Inlet Position) Section A-A 38.3 ±2 1. 5 15.35 ±0.1 8.05 ±0.1 10.5 Unit : mm : ±0.5 General tolerance for dimensions Figure 7-2 External Dimensions of the Printer Mechanism... -
Page 61: Chapter8 Handling Method
CHAPTER 8 HANDLING METHOD 8.1 PRECAUTIONS FOR INSTALLING/UNINSTALLING THE THERMAL PAPER Install the thermal paper with the paten unit released. Auto-loading is not allowed. Set the thermal paper straight to the printer and load the thermal paper until its edge is ejected for 5 cm and more from the top surface of the printer mechanism as shown in the Figure 8-1. -
Page 62: Precautions For Cleaning The Thermal Head
8.2 PRECAUTIONS FOR CLEANING THE THERMAL HEAD Do not clean the thermal head immediately after printing because the temperature of the thermal head and its peripherals rises very high during and immediately after printing. Clean the thermal head with the platen unit released. ...
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