Seiko LTP1245R-C384-E Technical Reference
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Seiko LTP1245R-C384-E Technical Reference

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LTP1245X-X384-E
LINE THERMAL PRINTER MECHANISM
TECHNICAL REFERENCE
U00085320001
Seiko Instruments Inc.

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  • Page 1 LTP1245X-X384-E LINE THERMAL PRINTER MECHANISM TECHNICAL REFERENCE U00085320001 Seiko Instruments Inc.
  • Page 2 Copyright © 2003, 2005 by Seiko Instruments Inc. All rights reserved. Seiko Instruments Inc. (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 reference manual describes the specifications and basic operating procedures for the LTP1245 (for RoHS) Line Thermal Printer Mechanism. For the LTP1245 (RoHS supporting), four models are available: LTP1245R-C384-E • LTP1245S-C384-E • LTP1245T-S384-E • LTP1245U-S384-E • In this reference manual, the information mentioned as LTP1245 is common to all models unless otherwise noted, and if the information is different depending on the model, specific model name is mentioned clearly.

  • Page 5: Table Of Contents

    TABLE OF CONTENTS Section Page CHAPTER 1 PRECAUTIONS SAFETY PRECAUTIONS .................... DESIGN AND HANDLING PRECAUTIONS ..............1.2.1 Design Precautions ..................1.2.2 Handling Precautions ..................1.2.3 Precautions on Discarding ................CHAPTER 2 FEATURES CHAPTER 3 SPECIFICATIONS GENERAL SPECIFICATIONS ..................HEAT ELEMENT DIMENSIONS .................. PAPER FEED CHARACTERISTICS................

  • Page 6: Section Page

    Section Page CHAPTER 4 CONNECTING EXTERNAL CIRCUITS THERMAL HEAD CONTROL TERMINALS..............MOTOR AND DETECTOR TERMINALS..............CHAPTER 5 DRIVE METHOD THERMAL HEAD DRIVE TIMING................MOTOR DRIVE TIMING ....................CHAPTER 6 HOUSING DESIGN GUIDE SECURING THE PRINTER ..................6.1.1 Printer Mounting Method ................. 6.1.2 Precautions for Securing the Printer ...............
  • Page 7 Example of Timing Chart of the Thermal Head Driving ..........Example of Motor Drive Timing Chart ................Paper Layout ........................ Sample Outer Casing Structure ................... LTP1245R-C384-E Appearance and Dimensions ............LTP1245S-C384-E Appearance and Dimensions ............LTP1245T-C384-E Appearance and Dimensions............LTP1245U-C384-E Appearance and Dimensions ............
  • Page 8 TABLES Table Page General Specifications ....................Sample Motor Drive Frequency ................... General Motor Specifications ..................Excitation Sequence..................... Acceleration Steps ....................... 3-13 Blocks and Activated Heat Elements ................3-16 Head Voltage........................ 3-17 Thermal Head Electrical Characteristics ..............3-18 Activation Pulse Width....................3-23 3-10 Temperature and Corresponding Thermistor Resistance..........

  • Page 9: Chapter 1 Precautions

    CHAPTER PRECAUTIONS Read through this manual to use the printer properly. Also, design the product taking the detailed precautions that are noted in each section into consideration. This reference manual subjects to change without notice. Ask the latest information of the printer to our service. Damage due to improper handing of the printer without following the instruction described in this reference manual will not be responsible for SII.

  • Page 10: Design And Handling Precautions

    DESIGN AND HANDLING PRECAUTIONS To maintain the initial level of performance of the LTP1245 and to prevent future problems from occurring, observe the following precautions. 1.2.1 Design Precautions If too much energy is applied to the thermal head, it may overheat and become damaged. Always use the printer with the specified amount of energy.

  • Page 11: Handling Precautions

    Design the outer case so that the thermal head control terminals can move after fixing to the connector because they move 2 to 3 mm due to the up/down action of the thermal head. Design the outer case so that it prevents the paper feed out from being caught in the platen. If the thermal head remains in contact directly with the platen, they may stick tight each other.

  • Page 12: Precautions On Discarding

    Connect or remove the connectors after powering off the printer. When printing at a high print rate (black or zigzag pattern) in a low temperature or high humidity environment, the vapor from the paper during printing may cause condensation to form on the printer or may soil the paper itself.

  • Page 13: Chapter 2 Features

    CHAPTER FEATURES The LTP1245 Line Thermal Printer Mechanism is a compact, high-speed thermal line dot printing mechanism. It can be used with a measuring instrument and analyzer, a POS, a communication device, or a data terminal device. Since the LTP1245 Line Thermal Printer Mechanism can be battery driven, it can easily be mounted onto a portable device such as a hand-held terminal.
  • Page 14 Automatic paper load The paper detector enables the LTP1245 to load paper automatically. Paper feed knob The paper feed knob for manual paper feed is optionally attached depending on the specification. It is selectable according to the applications. Thermal head cleaning Move the head up lever to open position to clean the thermal head.

  • Page 15: General Specifications

    CHAPTER SPECIFICATIONS GENERAL SPECIFICATIONS Table 3-1 General Specifications Item Specification Print method Thermal dot line printing Dots per line 384 dots Resolution 8 dots/mm Print width 48 mm Maximum printing speed 200 dot lines/s (25.0 mm/s) (at 5 V) 450 dot lines/s (56.25 mm/s) (at 7.2 V) 500 dot lines/s (62.5 mm/s) (at 8.0 V) Paper feed pitch 0.125 mm...
  • Page 16 Table 3-1 General Specifications (Continued) Item Specification Operating temperature range -30°C to 70°C (No codensation) -35°C to 75°C Storage temperature range (No codensation) Life span (at 25°C and rated energy) Activation pulse resistance 100 million pulses or more (print ratio=12.5%) Abrasion resistance 50 km or more (excluding damage due to an alien substance such as rubbish)

  • Page 17: Heat Element Dimensions

    HEAT ELEMENT DIMENSIONS The LTP1245 contains a thermal head with 384 heat elements (dot-size). 48 mm (384 DOTS) 0.125 mm 0.125 mm Figure 3-1 Heat Element Dimensions mm (PAPER WIDTH) 5 mm 5 mm 48 mm (PRINTING WIDTH) 0.125 mm (PAPER FEED PITCH)

  • Page 18: Paper Feed Characteristics

    PAPER FEED CHARACTERISTICS Paper is fed in a forward direction when the motor shaft is rotating in the normal direction (clockwise) when seen from the motor gear side. The motor is driven by a 2-2 phase excitation, constant current chopper method and feeds paper by 0.125 mm (equivalent to a single dot pitch) every two steps of the motor drive signal.

  • Page 19: Step Motor Characteristics

    STEP MOTOR CHARACTERISTICS Table 3-3 General Motor Specifications Item Specification Type Number of phases 4-phase Drive method Bipolar chopper Excitation 2-2 phase 14 Ω ±10% Winding resistance per phase Rated voltage 4.2 - 8.5 V Rated current 0.23 A/phase, 0.15 A/phase Maximum current consumption 0.46 A Drive frequency...

  • Page 20: Motor Drive Circuit

    3.4.1 Motor Drive Circuit (1) Sample Drive Circuit Sample drive circuit for the motor are shown in Figure 3-3. 10µF 0.51Ω LB1843V-E 1/2W 74HC32 10KΩ 3KΩ 0.01µF 10%,10% 3KΩ 0.01µF 1KΩ 10%,10% 0.01µF 74HC123A 10%,10% CTCRL 0.1µF 1SS294 1.8KΩ (TE85L, F) 0.01µF 1KΩ...
  • Page 21 (2) Excitation Sequence As shown in Table 3-4, the LTP1245 feeds paper in the normal direction when the motor is excited in the order of step 1, step 2, step 3, step 4, step 1, step 2, ..On the other hand, to rotate the motor in a reverse direction, drive the motor in the reverse order of: step 4, step 3, step 2, step 1, step 4, step 3, .

  • Page 22: Motor Timing

    3.4.2 Motor Timing Refer to the timing chart in Figures 3-5 and 3-6 when designing the control circuit or software for starting and stopping the motor. Also take note of the following precautions: Precautions for Designing the Motor Control Circuit and Software (1) Stop step To stop the motor, excite for a single step period with a phase that is the same as the last one in the printing step.
  • Page 23 (4) Others Do not print paper at the intermittent feed mode. Doing so may deteriorate the printing quality due to irregular paper feeding pitch. To print characters and bit images, always follow the start step and stop step.

  • Page 24: Precautions For Driving The Motor

    3.4.3 Precautions for Driving the Motor (1) Motor Current Control Low speed motor driving while printing due to a division drive method, print data, and input data transfer speed may cause noise or print trouble to occur due to over torquing or overheating of the motor. To prevent these from occurring, be sure to set the motor current as follows and perform two-current control.
  • Page 25 In use at temperature below -5°C CTCRL1 230mA Start 1st step 2nd step 3rd step 4th step 5th step 6th step (5.78ms) (5.78ms) (3.57ms) (3.33ms) (3.33ms) (3.33ms) (3.33ms) Max speed=300pps Motor speed = 300 pps CTCRL1=”High” First set current: 0.23 (A) Figure 3-7 Motor Drive Timing Chart (in use at temperature below -5°...
  • Page 26 (2) Acceleration Control When driving the motor, acceleration control is needed to start paper feeding. When the motor is to be driven at the motor drive frequency that is calculated using equation (1), the motor may come out of step under heavy load.
  • Page 27 Table 3-5 Acceleration Steps Number of Speed Step Time Steps (pps) (µs) start 5780 5780 3571 2762 2314 2028 1828 1675 1553 1456 1374 1302 1242 1191 1144 1103 1065 1031 1000 1000 3-13...

  • Page 28: Thermal Head

    THERMAL HEAD 3.5.1 Structure of the Thermal Head As Figure 3-8 shows, the LTP1245 thermal head consists of 384 heat elements, and heat element drivers. Serial printing data input from the DAT terminal is transferred to the shift register synchronously with the CLK signal, then stored in the latch register with the timing of the LATCH signal.
  • Page 29 Block6 Block5 Block2 Block1 Heat Element Output Driver Latch Register Shift Register LATCH DST6 DST5 DST2 DST1 Thermistor Figure 3-8 Thermal Head Block Diagram 3-15...

  • Page 30: Printed Position Of The Data

    Table 3-6 Blocks and Activated Heat Elements Block Number Heat Element Number Dots / Block 1 - 64 65 - 128 129 - 192 193 - 256 257 - 320 321 - 384 3.5.2 Printed Position of the Data Data dots from 1 to 384 which are transferred through DAT are printed as shown in Figure 3-9. PAPER FEED DIRECTION PAPER PRINT SURFACE...

  • Page 31: Head Resistance

    3.5.3 Head Resistance The LTP1245 head resistance is176 Ω ± 4 %. 3.5.4 Head Voltage The LTP1245 has a built-in head driver IC and control IC. Table 3-7 shows the head voltage. Table 3-7 Head Voltage Item Voltage Range Head drive voltage 4.2 to 8.5 V Head logic voltage 4.5 to 5.5 V...

  • Page 32: Thermal Head Electrical Characteristics

    3.5.6 Thermal Head Electrical Characteristics Table 3-8 Thermal Head Electrical Characteristics (Vdd=4.5 to 5.5V, Ta=0 to 50°C) Rated Item Sinbol Conditions Unit Ω Head resistance Head drive voltage Head drive current Vp=8.5 V, max. simultaneously activated dot “64” Logic block voltage Waiting for activation Logic block current fclk=4MHz,DAT=fixed...

  • Page 33: Timing Chart

    3.5.7 Timing Chart Figure 3-10 Timing Chart 3-19...

  • Page 34: Controlling The Head Activation (Dst) Pulse Width

    CONTROLLING THE HEAD ACTIVATION (DST) PULSE WIDTH 3.6.1 Calculation of Head Activation Pulse Width Head activation pulse width is calculated using the following equation (3). To execute high quality printing using the LTP1245, the value that is calculated using the following equation (3) must be adjusted according to the printer’s installation environment.
  • Page 35 3.6.3 Adjustment of Head Activation Voltage Adjustment of head activation pulse width due to changing the head activation voltage is to be in accordance with equation (5). The adjustment method differs if the head drive voltage (Vp) is 5.5 V or more or under 5.5 V.

  • Page 36: Determination Of Activation Pause Time And Activation Pulse Period

    3.6.5 Determination of Activation Pause Time and Activation Pulse Period Dot lines may be activated in succession to the same thermal dot in order to protect thermal head elements. Determine the activation period (the time from the preceding activation start to the current activation start) which conforms to equation (7) to reserve the pause time.

  • Page 37: Calculation Sample For The Head Activation Pulse Width

    3.6.7 Calculation Sample for the Head Activation Pulse Width Table 3-9 displays the calculation sample of the head activation pulse width that was calculated using equation (3) and the values obtained using equations (4) to (8). Table 3-9 Activation Pulse Width Head Drive Thermistor Motor Drive Frequency (PPS)

  • Page 38: Thermistor Resistance

    3.6.8 Thermistor Resistance The resistance of the thermistor at the operating temperature T (°C) is determined using the following equation (10). Equation (10):     × × −         Resistance at operating temperature Tx (°C) 15 kΩ...

  • Page 39: How To Print Using 2-Ply Thermal Paper

    Table 3- 10 Temperature and Corresponding Thermistor Resistance Temperature Thermistor Temperature Thermistor (° ° ° ° C) Resistance (kΩ Ω Ω Ω ) (° ° ° ° C) Resistance (kΩ Ω Ω Ω ) 375.54 8.63 275.39 7.26 204.55 6.14 153.76 5.22 116.89...

  • Page 40: Detecting Abnormal Temperatures Of The Thermal Head

    3.6.10 Detecting Abnormal Temperatures of the Thermal Head To protect the thermal head and to ensure personal safety, abnormal thermal head temperatures must be detected by both hardware and software as follows: Detecting abnormal temperatures by software Design software that will deactivate the heat elements if the thermal head thermistor (TH) detects a temperature higher than 80 °C (thermistor resistance RTH ≤...

  • Page 41: Head-Up/Paper Detector

    HEAD-UP/PAPER DETECTOR LTP1245 has a built-in head-up detector to detect whether the head is up or down and a paper detector to detect whether paper is present or exhausted. Both detectors are reflection photo interruptors which are designed to output signals as shown in Table 3-11 according to their status.

  • Page 42: Sample External Circuit

    Table 3-13 Detectors Input / Output Conditions Item Symbol Conditions Std. Max. Forward voltage =10mA 1.15V 1.3V (input) Reverse current 10µA Photo-transistor Dark current =24V 0.1µA (output) Transfer Photo electric =10mA, V 450µA 1100µA characteristics current Response time =1mA, V =10V 10µs (at rise)

  • Page 43: Automatic Paper Load

    3.7.3 Automatic Paper Load Paper can be automatically loaded when used in conjunction with the paper detector. To prevent paper from skewing, cut the edges at right angles in line with the paper feed direction before loading it. If skewed, feed the paper until it is straight, or place the head in the up position and adjust the paper so that it is fed straight.

  • Page 44: Mode Code Label

    Mode Code Label Figure 3-14 shows that the printer is the LTP1245R-C384-E which is made in September 2004. See Figure 7-1 LTP1245R-C384-E Appearance and Dimensions for labeling position. (1) Manufactured year: 2004 (2) Model code: LTP1245R-C384-E (3) Manufactured month: September (X: October, Y: November, Z: December) １...

  • Page 45: Chapter 4 Connecting External Circuits

    CHAPTER CONNECTING EXTERNAL CIRCUITS The LTP1245 has two types of connectors to connect it to the external circuits: FPC (Flexible Printed Cable) type connector and FFC (Flexible Flat Cable) type connector. Table 4-1 shows the recommended connectors. Table 4-1 Recommended Connectors External Circuit Number of Recommended Connectors...

  • Page 46: Thermal Head Control Terminals

    THERMAL HEAD CONTROL TERMINALS Figure 4-1 shows the FFC terminals of the thermal head control. Figure 4-1 Thermal Head Control Terminals (FFC) Table 4-2 Thermal Head Control Terminal Assignments Terminal Signal Name Input/ Function Number Output Input Thermal head drive voltage Input Thermal head drive voltage Input...

  • Page 47: Motor And Detector Terminals

    MOTOR AND DETECTOR TERMINALS Figure 4-2 shows the FPC terminals of the motor control, paper detector and head-up detector. Figure 4-2 Motor and Detector Terminals (FPC) Table 4-3 Motor and Detector Terminals Assignments Terminal Signal Name Function Number Output signal of the head-up detector (collector output of a photo-transistor) Power supply of the head-up detector (LED anode)

  • Page 49: Chapter 5 Drive Method

    CHAPTER DRIVE METHOD THERMAL HEAD DRIVE TIMING Input of print data Input of DAT and CLK transfer the print data to the shift register in serial input. “High” means printing and “Low” means no-printing in DAT. DAT data is read in at the rising edge of the CLK inputs.

  • Page 50: Motor Drive Timing

    MOTOR DRIVE TIMING The phase of motors and the thermal head need to be synchronized to print. As example, the print method which divides one dot line to two groups; the blocks 1,3, and 5 and the blocks 2,4, and 6, and prints each group data for each step of the motor is described below. Basic pulse width of the motor drive pulse, Tm, is a value (unit: msec) of the reciprocal number of the driving frequency calculated using equation (1) of "3.3 PAPER FEED CHARACTERISTICS".
  • Page 51 2nd line, 1st step Drive the motor by one step (3rd step). As to how much step time is output, compare Tm with the time that was taken in the previous step. (1) in case Tm < the time that was taken in the previous step, the next closest acceleration step time to the previous step time or Tm, which is longer, is output.
  • Page 52 STEP OF STEP OF STEP OF STOP START STEP OF THE 1 DOT LINE THE 2 DOT LINE THE 1 DOT LINE THE 2 DOT LINE LATCH 1,3,5 1,3,5 2,4,6 2,4,6 Block Block Block Block Figure 5-2 Example of Motor Drive Timing Chart...

  • Page 53: Chapter 6 Housing Design Guide

    CHAPTER HOUSING DESIGN GUIDE SECURING THE PRINTER The LTP1245 can be secured to the outer casing with screws. 6.1.1 Printer Mounting Method Secure the printer with a mounting hole ( φ 2.8) and 2 shaped indents. See "CHAPTER 7 APPEARANCE AND EXTERNAL DIMENSION" for locations and dimensions. Recommended Screws and Washers Recommended mounting screws and washers are as follows: ①...

  • Page 54: Layout Of Printer And Paper

    LAYOUT OF PRINTER AND PAPER Design the paper outlet angle in 0 to 45°. (See Figure 6-1) Paper outlet angle (θ) : 0°≤θ≤45° HEAT ELEMENT THERMAL PAPER ROLL PLATEN θ THERMAL HEAD MOUNTING FACE PAPER DETECTOR The distance between the paper detector and the heat element is approximately 8 mm.

  • Page 55: Outer Casing Structure

    OUTER CASING STRUCTURE Figure 6-2 shows a sample structure for the outer casing. * Provide a gap of a few mm between the printer and the outer casing since the area over the thermal head becomes very hot. Figure 6-2 Sample Outer Casing Structure...

  • Page 57: Chapter 7 Appearance And Dimensions

    CHAPTER APPEARANCE AND DIMENSIONS Figure 7-1 shows the appearance and external dimensions of the LTP1245.
  • Page 58 Unit : mm Tolerance: ±0.5 mm Figure 7-1 LTP1245R-C384-E Appearance and Dimensions...
  • Page 59 Unit : mm Tolerance: ±0.5 mm Figure 7-2 LTP1245S-C384-E Appearance and Dimensions...
  • Page 60 Unit : mm Tolerance: ±0.5 mm Figure 7-3 LTP1245T-S384-E Appearance and Dimensions...
  • Page 61 Unit : mm Tolerance: ±0.5 mm Figure 7-4 LTP1245U-S384-E Appearance and Dimensions...

  • Page 63: Chapter 8 Loading/Unloading Paper And Head Cleaning

    CHAPTER LOADING/UNLOADING PAPER AND HEAD CLEANING LOADING/UNLOADING PAPER PRECAUTIONS ① ① ① ① Loading paper Load paper with the thermal head in the up position. (See Figure 8-1 Head Cleaning Procedure (b) in Section 8.2 “HEAD CLEANING PROCEDURES AND PRECAUTIONS”). Cut the edge of the paper so that the center of the paper will be inserted first NO GOOD NO GOOD...
  • Page 64 ③ ③ ③ ③ Auto-loading paper Cut the edge of the paper so it is vertical to the direction of the paper feed. NO GOOD GOOD NO GOOD NO GOOD Load paper with thermal head in the down position. If the paper skews, place the thermal head in the up position and reset the paper. If the thermal head has been in the down position for a long time, it will be impossible to insert because the head is in contact with the platen.

  • Page 65: Head Cleaning Procedure And Precautions

    HEAD CLEANING PROCEDURE AND PRECAUTIONS PROCEDURE : ① Lift the head up lever (a) so it stands upright (b). ② Clean the heat elements using alcohol and a cotton swab. ③ After cleaning, set the head up lever to its original position by reversing the steps. PRECAUTIONS : ①...

  • Page 67: Chapter 9 Peripheral Equipment

    CHAPTER PERIPHERAL EQUIPMENT AUTOCUTTER UNIT The LTP1245 can be equipped with the ACU6205 autocutter unit. The ACU6205 autocutter unit uses the circular cut method. The circular cut method enables the ACU6205 autocutter unit to be compact and lightweight. For the specifications and the mechanism of how the ACU6205 operates, see the ACU6205 AUTOCUTTER UNIT TECHNICAL REFERENCE.
  • Page 68 9.1.1 Installation (1) When Using a Special Mount 1) Secure the printer on the special mount (OP-L1200-E) with the special screws. ① 2) The recommended tightening torque is 3 kgf cm ( in Figure 9-1). 3) Use four screws to secure the mount on the cabinet. Recommended screws: M2.6 (② in Figture 9-1).

  • Page 69: Opening And Closing The Autocutter Unit

    (2) When Designing a Mount Design a mount so that the fulcrum for rotation is located as shown in Figure 9-2. Fulcrum for rotation Figure 9-2 Designing a Mount 9.1.2 Opening and Closing the Autocutter Unit Open the autocutter unit to insert sheets of paper manually or to clear paper jams. To open the autocutter unit, lift the part shown in Figure 9-3.

  • Page 70: 9.1.3 Inserting Recording Paper

    9.1.3 Inserting Recording Paper (1) Automatic paper insertion Paper can be inserted automatically with the autocutter unit closed. See ③ in Section 8.1, LTP1245 LINE THEMAL PRINTER MECHANISM TECHNICAL REFERENCE. (2) Manual paper insertion Open the autocutter unit and insert paper. See ①...

  • Page 71: 9.1.5 Hints For Use

    9.1.5 Hints for Use (1) Do not back feed paper after cutting paper using the autocutter unit because it will cause a paper jam. (2) To prevent paper from jamming, feed paper or print feed more than 3 mm after cutting paper. (3) To make the most efficient use of paper, as shown in Figure 9-5, print area A for the next print portion after printing area B, and then cut the paper.

  • Page 72: 9.1.6 External View When The Ltp1245 Is Equipped With The Autocutter

    9.1.6 External View when the LTP1245 is equipped with the Autocutter unit: mm Figure 9-6 External View when the LTP1245 is equipped with the Autocutter...

  • Page 73: Ltp1245 Mount (Op-L1245A-E)

    LTP1245 MOUNT (OP-L1245A-E) The LTP1245 can be secured on the cabinet using the LTP1245 mount (OP-L1245A-E) and four screws. 9.2.1 Installation Align the two notches of the printer with the tabs on the LTP1245 mount (OP-L1245A-E) and secure the printer by installing a special screw (No.0 cross-recessed machine screw; tightening torque: 3 kgf •...

  • Page 74: 9.2.2 Op-L1245A-E External View

    9.2.2 OP-L1245A-E External View Unit:mm Figure 9-8 LTP1245 Mount External View (OP-L1245A-E)

This manual is also suitable for:

Ltp1245s-c384-eLtp1245t-s384-eLtp1245u-c384-e

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