Seiko LTPA245 Series Reference Manual Download | Manualshive

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3-17

3.5.6 Timing

Chart

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Figure 3-8 Timing Chart

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Summary of Contents for LTPA245 Series

Page 1: ...LTPA245 SERIES LINE THERMAL PRINTER MECHANISM TECHNICAL REFERENCE U00060425801 ...

Page 2: ...e 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 SII reserves the right to make changes without notice to the specifications and materials contained herein and shall not be responsible for any damages including consequential caused by reliance on the materials presented including but not limited to typog...

Page 3: ...vides information common to the LTPA245 series printers Where the information differs depending on the printer model the name of the relevant model is specified Chapter 1 Precautions describes safety design and operational precautions Read it thoroughly before designing in order to ensure proper use of the printer SII has not investigated the intellectual property rights related to the sample circ...

Page 4: ... Warn the user not to touch the thermal head or its periphery as they are very hot during and immediately after printing Also allow cooling by designing clearance between the head and the outer case Preventing the user from touching the motor Design the outer case so that the user cannot touch the motor as the motor are very hot during and immediately after operating Also allow cooling by designin...

Page 5: ...prevent the thermal head from being damaged by static electricity Fix the FG plate as shown in Figure 6 2 to the Frame Ground FG For details on how to mount an FG cable see Section 6 1 2 The FG cable and FG cable lock screw should be prepared in advance Connect the GND terminal SG to FG through 1 M resistor so that the electric potential of the SG of the thermal head and the FG of the printer are ...

Page 6: ... into it For the dimensions of the platen support the platen block positioning and securing follow the instructions shown in Figures 6 4 and 6 5 Metal or aluminum platen support cannot fit the platen block shaft When using the LTPA245A When removing the platen block follow the instructions shown in Figure 7 4 and continue to press the lock arm lever until the A portion of the lock arm see Figure 7...

Page 7: ... paper from sliding design the outer case so that the paper is guarded securely Platen block Prepare the paper holder cover and mount the platen block to the paper holder cover for the platen block support For the fixing position and dimensions see Figure 6 6 The platen block should be pulled up while the lock arm lever is pressed to the Open state to remove the platen block It should never be pul...

Page 8: ...be possible to remove the platen block Design the outer case so that such lock arm lever operation can be performed 1 2 2 Since the printer mechanism does not have a function to prevent paper from sliding design the outer case so that the paper is guarded securely Platen block Prepare the paper holder cover and mount the platen block to the paper holder cover for the platen block support For the f...

Page 9: ...Also incorrect paper feed puts a load on the reduction gear and may shorten the longevity of the gear Do not hit or scratch the surface of the thermal head with sharp or hard objects as it may damage the heat element If the thermal head remains in contact with the platen the platen may become deformed and deteriorate print quality If the platen is deformed the uneven surface of the platen can be r...

Page 10: ...1 7 1 2 3 Precautions on Discarding When discarding used printers discard them according to disposal regulations and rules of each respective district ...

Page 11: ...pact and light weight 1 The mechanism is compact and light 69 2 mm in width 28 3 mm in depth 31 7 mm in height and approximately 41 g LTPA245A and 43 g LTPA245B LTPA245C and LTPA245D in mass Improved operability The platen roller can be released easily by lever operation allowing easy paper installation and head cleaning High resolution printing A high density print head of 8 dots mm produces clea...

Page 12: ...ase The printer mechanism is designed to fit easily into the outer case allowing for reduced number of outer case parts 1 The external dimensions exclude those of the lever of the lock arm and the platen block 41 g in mass includes all parts 2 Print speed differs depending on working and environmental conditions ...

Page 13: ... the motor VP For head logic Vdd Average 1 48 A at 5 V 2 13 A at 7 2 V 2 51 A at 8 5 V 2 Maximum 1 53 A at 5 V 2 20 A at 7 2 V 2 60 A at 8 5 V 2 Maximum 0 60 A Maximum 54 mA 1 Maximum printing speed is attained with the following conditions When the driving voltage is 5 V the character size is a 24 dot font the line spacing is 16 dots the temperature of the head is 50 C or more the number of simul...

Page 14: ...80 gf or more Dimensions width depth height 69 2 28 3 31 7 mm excluding lever of lock arm and platen block Mass Approximately 41 g LTPA245A 43 g LTPA245B LTPA245C and LTPA245D Recommended thermal paper 4 TF50KS E2D 59 µm paper from Nippon Paper Industries Co Ltd 3 Outside this range prining may blot or be light 4 The paper roll should be placed facing the thermal surface outward See Figure 6 6 Als...

Page 15: ...inter contains a thermal head with 384 heat elements dot size Figure 3 1 Heat Element Dimensions Figure 3 2 Print Area 5 mm 48 mm 384 DOTS 0 125 mm 0 125 mm 0 0625 mm 58 mm PAPER WIDTH 48 mm PRINTING WIDTH 5 mm 0 062 mm PAPER FEED PITCH 0 1 ...

Page 16: ...thermal paper with the autocutter or tear bar hand cutter Be sure to start printing after such operation During paper feeding the motor should be driven lower than the value obtained by equation 1 and 2 Equation 1 Vp 5 5 V Vp 160 80 pps Max 1440 pps Equation 2 Vp 5 5 V Vp 210 195 pps During printing the motor drive frequency should be adjusted according to working conditions such as voltage temper...

Page 17: ... of the Motor Item Specification Type PM Drive method Bipolar chopper Excitation 2 2 phase Winding resistance per phase 14 Ω 10 Rated voltage 4 5 8 5 V Rated current 0 30 A phase Maximum current consumption 0 60 A Drive frequency 200 1440 pps according to drive voltage ...

Page 18: ...3 6 3 4 1 Motor Drive Circuit 1 Sample Drive Circuit Sample drive circuit for the motor is shown in Figure 3 3 Figure 3 3 Sample Drive Circuit Vdd Vdd Vdd Vdd Vdd Vdd 10V 10V 10V 10V ...

Page 19: ...step 1 step 2 step 3 step 4 step 1 step 2 Do not feed paper in the reverse direction Table 3 4 Excitation Sequence Signal Name Sequence Step 1 Step 2 Step 3 Step 4 A Low High High Low B High High Low Low A High Low Low High B Low Low High High Figure 3 4 Input Voltage Signals for the Sample Drive Circuit H L H L H L H L A B A B 1 DOT LINE ...

Page 20: ...In the pause state do not excite the step motor to prevent the motor from overheating Even when the step motor is not excited it maintains a holding force to prevent paper from sliding 3 Start step To restart the motor from the stop step shift the motor into the printing sequence To restart the motor from the pause no excitation state shift the motor into the printing sequence after outputting for...

Page 21: ...step and stop step When the motor step is stopped in the dot lines where head activation was performed the thermal head may stick to the surface of the paper and cause paper feed problems Therefore stop the motor drive in the dot lines where head activation is not performed ...

Page 22: ...start paper feeding When the motor is to be driven at the motor drive frequency that is calculated using equations 1 and 2 calculated in Section 3 3 the motor may come out of step under heavy load Drive the motor to the maximum driving speed that is calculated using equations 1 and 2 according to the acceleration steps in Table 3 5 The method for accelerating the motor is as follows 1 Output start...

Page 23: ...186 1220 1254 1287 1318 1350 1380 1410 1440 5000 4875 3013 2327 1953 1712 1541 1412 1310 1227 1158 1099 1048 1004 964 929 898 869 843 819 798 777 758 741 725 709 694 3 Preventing Overheating To prevent the motor from overheating continuous driving of the printer should be 1 5 m or less in print length Set the pause time for 30 seconds or more after driving the printer Dynamic division 64 dots driv...

Page 24: ...AT 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 Inputting the head activation signal DST 1 to 6 activates heat elements in accordance with the printing data stored in the latch register A maximum of six division printing is available for the printer Table 3 6 shows the relationship between DST ...

Page 25: ...ST2 DST1 TH Vdd GND Vp Shift Register Latch Register Output Driver Heat Element DOT 384 DOT 321 DOT 320 DOT 257 DOT 256 DOT 129 DOT 128 DOT 65 DOT 64 DOT 1 Block6 Block5 Blcok2 Block1 Thermistor Figure 3 6 Thermal Head Block Diagram ...

Page 26: ...20 64 6 321 384 64 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 7 Figure 3 7 Printed Position of the Data LTPA245 PRINTER MECHANISM 1 2 3 4 5 6 382 383 384 PAPER FEED DIRECTION PRINT SURFACE DATA PRINT SEQUENCE PAPER DATA INPUT SEQUENCE 1 2 3 4 5 6 382 383 384 DATA IN ...

Page 27: ...eak Current Since the peak current maximum current may reach the values calculated using equation 3 shown below when the thermal head is driven make sure that the allowable current for the cable material and the voltage drop on the cables are well within the specified range Equation 3 Ip Peak current A N Number of dots that are driven simultaneously Vp Head drive voltage V RH Head resistance Ω N V...

Page 28: ...Vil CLK DAT LATCH DST 0 0 2 Vdd V CLK 3 µA DAT 0 5 µA LATCH 3 µA High input current DST Iih Vdd 5 0 V Vih 5 0 V 30 µA CLK 3 µA DAT 0 5 µA LATCH 3 µA Low input current DST Iil Vdd 5 0 V Vil 0 V 0 5 µA 3 0 V Vdd 5 25 V 8 MHz CLK frequency fclk 2 7 V Vdd 3 0 V 5 MHz CLK pulse width t1 See the Timing Chart 30 ns DAT setup time t2 See the Timing Chart 30 ns DAT hold time t3 See the Timing Chart 10 ns L...

Page 29: ...3 17 3 5 6 Timing Chart b k j c s k s b g 1 1 clk 3 4 5 7 2 c r s 6 8 c s n 1 f clk DAT t1 t6 t2 t3 t4 t5 t7 CLK LATCH DST t8 DATO Figure 3 8 Timing Chart ...

Page 30: ...orten the longevity of the thermal head Equation 4 t Head pulse width ms E Standard applied energy mj See Section 3 6 2 V Applied voltage V See Section 3 6 3 R Head resistance Ω See Section 3 6 4 C Head pulse term coefficient See Section 3 6 6 D Heat storage coefficient See Section 3 6 7 3 6 2 Calculation of Applied Energy Applied energy should be in accordance with the temperature of the thermal ...

Page 31: ...g resistance Calculate the head resistance using equation 7 Equation 7 RH Head average resistance 176 Ω 4 16 Wiring resistance in the thermal head Ω RC Common terminal wiring resistance in the thermal head 0 05 Ω rC Wiring resistance between VP and GND Ω 1 N Number of dots driven simultaneously 1 It indicates a series resistance of wire and relay switching circuits used between the FPC terminals a...

Page 32: ...C 1 0 5 0 8 W W 1000 motor drive frequency activation pulse for the previous 1 block 3 6 6 Determination of Activation Pause Time In order to protect the thermal head heat elements when the same heat element dots are activated continuously on the successive dot line determine the pause period the time from the end of the the preceding activation to the start of the current activation which meets e...

Page 33: ...rrection is not needed set 1 as the heat storage coefficient The heat storage coefficient is calculated as follows 1 Prepare the heat storage software counters to simulate heat storage a Heat storage due to head activation The heat storage counter counts up in each print cycle as follows T T T Heat storage counter value N Number of the activated dots b Radiation The heat storage counter value is m...

Page 34: ... 311 40 527 477 454 432 411 391 372 354 337 320 304 289 50 450 408 389 371 354 338 323 309 296 283 271 260 60 373 338 323 309 296 284 272 262 252 242 233 225 70 296 269 257 246 237 228 219 211 204 197 191 185 7 2 80 219 199 191 183 176 170 164 159 154 149 145 141 0 654 590 560 530 501 473 446 419 394 368 344 320 297 10 593 536 509 484 459 435 412 390 368 347 327 308 289 20 533 482 459 437 415 395 ...

Page 35: ...X Resistance at operating temperature Tx C R25 30 kΩ 5 25 C B 3950 k 2 TX Operating temperature C EXP A The Ath power of natural logarithm e 2 71828 Figure 3 9 Thermistor Resistance vs Temperature 1 1 RX R25 EXP B 273 TX 298 1 0 10 0 100 0 1000 0 5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 x ƒT ƒ ƒXƒ ï R l TEMPERATURE C RESISTANCE kΩ Ω Ω Ω ...

Page 36: ...Temperature C Thermistor Resistance kΩ Ω Ω Ω Temperature C Thermistor Resistance kΩ Ω Ω Ω 5 132 3 50 10 8 0 101 0 55 8 9 5 77 9 60 7 4 10 60 6 65 6 2 15 47 5 70 5 3 20 37 6 75 4 5 25 30 0 80 3 8 30 24 1 85 3 3 35 19 5 90 2 8 40 15 9 95 2 4 45 13 0 100 2 1 ...

Page 37: ...ons the software for detecting abnormal temperatures may not function properly resulting in overheating of the thermal head Overheating of the thermal head may cause damage to the thermal head or may cause burns to the user upon contact Always use hardware in conjunction with software for detecting abnormal temperatures to ensure personal safety If the control unit malfunctions it may be impossibl...

Page 38: ...ongevity of the head significantly If the motor is drived when it is out of paper a load is put on the reduction gear and the longevity of the gear may be shortened 3 7 1 General Specifications Table 3 11 Absolute Maximum Ratings of Detectors at 25 C Item Symbol Rating Forward current IF 50 mA Reverse voltage VR 5 V LED input Allowable current loss P 70 mW Collector to emitter voltage VCEO 20 V Em...

Page 39: ...c current IC IF 10mA VCE 5V 350µA Leak current ILEAK IF 10mA VCE 5V 1µA Collector saturation voltage VCE sat IF 10mA IC 50µA 0 5V Response time at rise tr IC 1mA VCC 5V 5µs Transfer characteristics Response time at fall tf RL 100Ω 5µs 3 7 2 Sample External Circuit Figure 3 10 Sample External Circuit of the Paper Detector PS VPS GND Photo interrupter CPU Port Vdd Vdd 36kΩ 200Ω GND LTPA245 The PS si...

Page 40: ...hermal head control LTPA245A or LTPA245D 27 Molex Co Ltd 52807 2710 horizontal type 52806 2710 vertical type 2 Thermal head control LTPA245B or LTPA245C 28 Molex Co Ltd 52807 2810 horizontal type 52806 2810 vertical type 4 1 THERMAL HEAD CONTROL TERMINALS Figure 4 1 shows the terminals configuration of the FPC thermal head control terminals Terminal Numbers 1 to 27 LTPA245A or LTPA245D Terminal Nu...

Page 41: ... TH Output Thermistor 15 DST3 Input Thermal head print activation instruction signal 16 DST2 Input Thermal head print activation instruction signal 17 DST1 Input Thermal head print activation instruction signal 18 Vdd Logic power supply 19 CLK Input Synchronizing signal for print data transfer 20 LATCH Input Print data latch memory storage 21 DAT0 Output Print data output serial output 22 Vp Therm...

Page 42: ... thermal head controls vertically while holding the reinforcement portion of the FPC Do not bend the FPC If the FPC must be bent unavoidably try to do so without removing the reinforcement sheet from the reinforcement portion of the FPC If the connectors are not connected properly it may damage the printer FPC or connectors ...

Page 43: ...ation pulse Setting the DST on High drives the heat elements of the thermal head Select the block to be activated and drive for the time calculated using the formula shown in 3 6 CONTROLLING THE HEAD ACTIVATION DST PULSE WIDTH then set the DST to Low Figure 5 1 shows the example of timing chart of the thermal head driving 1 The print data for next dot line can be transferred immediately after stor...

Page 44: ... 3 6 CONTROLLING THE HEAD ACTIVATION DST PULSE WIDTH has passed Next set DST for blocks 2 4 and 6 to High and set DST to Low after the activation of all the blocks has been completed Move to the 2nd step after completion of the 1st step time of the motor and the activation of all blocks 1st dot line 2nd step Drive the motor by one step 2nd step As to how much step time is output compare Tm with th...

Page 45: ...er as the 1st dot line 2nd dot line 2nd step Drive the motor by one step 4th 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 2 in case Tm the time that was taken in the previous step the clos...

Page 46: ... of the motor drive timing chart Figure 5 2 Example of Motor Drive Timing Chart A B A B CLK DST DAT LATCH 2nd STEP OF THE 1st DOT LINE 1st STEP OF THE 2nd DOT LINE 2nd STEP OF THE 2nd DOT LINE 1st STEP OF THE 1st DOT LINE START STOP ...

Page 47: ... are used for positioning the body of the printer Design bosses for positioning holes A and B precisely in the outer case See CHAPTER 7 APPEARANCE AND DIMENSIONS for locations and dimensions Figure 6 1 How to Secure the Printer Recommended Screws The recommended mounting screws are as follows 1 Screw JIS B1111 cross recessed pan head machine screw M2 0 2 Screw Cross recessed pan head tapping screw...

Page 48: ...le and FG cable lock screw of the types shown in Figure 6 2 For the application terminals of the FG cable the type shown in Figure 6 3 is recommended Figure 6 2 Connecting FG Cable Figure 6 3 FG Cable Application Terminal FG plate Application terminal round FG cable FG cable lock screw to FG Application terminal round φ5 5 mm max ...

Page 49: ... 6 1 3 Mounting Platen Block 1 When using the LTPA245A The printer does not have a platen block support function For the platen block support prepare the plastic poly carbonate is recommended platen support for snap fitting in the paper holder cover and fit the platen block shaft into it For the dimensions of the platen support the platen block positioning and sitting follow the instructions shown...

Page 50: ... shape of the platen support so that the platen support does not come in contact with the head block For the operational sizes of the lock arm lever and head block see Figure 7 4 Figure 6 5 How to Secure the Platen Block LTPA245A 2 Unit mm ...

Page 51: ...own in Figure 6 6 to secure the platen block When designing the paper holder cover use the dimensions shown below For the dimensions and for the operational sizes of the lock arm lever and platen block see CHAPTER 7 APPEARANCE AND DIMENSIONS Figure 6 6 How to Secure the Platen Block LTPA245B LTPA245C or LTPA245D Platen block Paper holder cover Paper holder cover Unit mm ...

Page 52: ...that the thermal head control terminals FPC can move 1 to 2 mm to compensate for the head moving l If the FPC for the thermal head control touches the bottom of the outer case strongly it causes disconnection or a short circuit Leave a space of approximately 0 3 mm between the bottom of the outer case where the FPC passes through and the bottom of the printer l Secure the platen block to the print...

Page 53: ...and the center axis of the paper roll is parallel with the printer l Keep the paper feed force to 0 49 N 50 gf or less l When the LTPA245A is used provide the shape of the platen support for the paper holder cover Also mount the platen block to its shape of the platen support on the paper holder cover For the rotation support point follow the position shown in CHAPTER 7 APPEARANCE AND DIMENSIONS l...

Page 54: ...NING THE PAPER CUTTER Design the position of the paper cutter so that the paper cutter is within the recommended range as shown below If the distance between the edge of the paper cutter and position reference hole A of the printer is less than 6 9 mm the paper cutter may interfere with the platen block when it is opened or closed If the distance between them is more than 7 5 mm the paper is not p...

Page 55: ...de of the Paper Cutter In the left cutter of Figure 6 9 the cut paper may be caught by the blade of the cutter and rolled inside Therefore use a cutter with the shape of a blade that will not catch the cut paper as in Figure 6 9 to the right The Blade of the Cutter The Blade of the Cutter Not Good Good ...

Page 56: ...7 1 7 APPEARANCE AND DIMENSIONS Figures 7 1 7 2 7 3 7 4 7 5 7 6 7 7 7 8 7 9 7 10 7 11 7 12 and 7 13 show the appearance and external dimensions of the LTPA245 CHAPTER ...

Page 57: ...7 2 Figure 7 1 LTPA245A Appearance and Dimensions Unit mm General Dimensional Tolerance Less than 30 mm 0 2 30 mm or more 0 3 ...

Page 58: ...7 3 Figure 7 2 LTPA245A Printer Main Body Appearance and Dimensions General Dimensional Tolerance Less than 30 mm 0 2 30 mm or more 0 3 Unit mm ...

Page 59: ...7 4 Figure 7 3 LTPA245A Platen Block Appearance and Dimensions Unit mm ...

Page 60: ...ever of lock arm Platen block Open Max Lock arm A portion Head block Unit mm Note When removing the platen block be sure to press the lock arm lever until the A portion of the lock arm comes up against the head block by lock arm lever operation If the lock arm lever is not pressed until the end the platen block may not be removed ...

Page 61: ...7 6 Figure 7 5 LTPA245B Appearance and Dimensions General Dimensional Tolerance Less than 30 mm 0 2 30 mm or more 0 3 Unit mm ...

Page 62: ...7 7 Figure 7 6 LTPA245B Printer Main Body Appearance and Dimensions General Dimensional Tolerance Less than 30 mm 0 2 30 mm or more 0 3 Unit mm ...

Page 63: ...7 8 Figure 7 7 LTPA245B LTPA245C and LTPA245D Platen Block Appearance and Dimensions Unit mm ...

Page 64: ... Figure E Doing so may cause function problems including lever deformation To avoid it provide the shape of a stopper on the operation lever or operation knob side when you design the lever and knob If its shape is provided on the lever side of the printer the lever will get deformed Figure E The range in which the platen block can be opened is S1 9 1 to S2 9 9 mm S 9 5 0 4 mm Figures C D E When t...

Page 65: ...7 10 Figure 7 9 LTPA245C Appearance and Dimensions Unit mm General Dimensional Tolerance Less than 30 mm 0 2 30 mm or more 0 3 ...

Page 66: ...7 11 Figure 7 10 LTPA245C Printer Main Body Appearance and Dimensions Unit mm General Dimensional Tolerance Less than 30 mm 0 2 30 mm or more 0 3 ...

Page 67: ...ing the platen block Figure D Do not lower the lever at S2 8 31 mm or below as shown in Figure D Doing so may cause function problems including lever deformation To avoid it provide the shape of a stopper on the operation lever or operation knob side when you design the lever and knob If its shape is provided on the lever side of the printer the lever will get deformed Figure D The range in which ...

Page 68: ...7 13 Figure 7 12 LTPA245D Appearance and Dimensions Unit mm General Dimensional Tolerance Less than 30 mm 0 2 30 mm or more 0 3 ...

Page 69: ...7 14 Figure 7 13 LTPA245D Printer Main Body Appearance and Dimensions Unit mm General Dimensional Tolerance Less than 30 mm 0 2 30 mm or more 0 3 ...

Page 70: ... LTPA245D Procedures for Loading Unloading Paper 1 Loading paper Turn the lever projection of the lock arm in the direction of the arrow shown in Figure 8 1 Figure 8 1 Loading Paper 1 After confirming that the platen block has separated from the printer mechanism lift the platen block up Open state CHAPTER ...

Page 71: ...blem take care not to damage the gear during handling Moreover make sure there is no foreign matter on the gear The paper detector photo interrupter may not operate properly if covered with foreign matter Therefore if you find foreign matter on the detector remove it and clean the detector If the paper skews feed the paper so that it returns to normal first then take it out and set it again 2 Unlo...

Page 72: ...8 3 Loading Paper 1 While the lever of the lock arm is pressed down until the open position of the platen block lift the platen block up LTPA245B Open state After confirming that the platen block has separated from the printer mechanism lift the platen block up LTPA245C Open state Insert the paper vertically into the printer See Figure 8 4 Pull the tip of the paper outside the paper outlet and pla...

Page 73: ...tances on the reduction gear If foreign substances are attached to or accumulated on the paper sensor photo interrupter a detection error may occur If the paper is skewed feed the paper until the paper is set straight or mount the paper again 2 Unloading paper Unload the paper in the open position of the platen block 3 Removing jamming paper Remove the jamming paper in the open position of the pla...

Page 74: ...dpaper cutter knives etc when cleaning They will damage the heat elements 8 2 2 Procedures 1 Set the platen block to the Open state following the procedure for loading paper described in Sections 8 1 1 1 and 8 1 2 1 2 Clean the heat elements using a cotton swab soaked in ethyl or isopropyl alcohol 3 Wait until the alcohol dries and close the platen block Close state Figure 8 5 Head Cleaning Proced...

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