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1-3 

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) V

dd

 

→

 2) 

V

P

 

At shut down  : 1) 

V

P

 

→

 2) 

V

dd

 

•

  A surge voltage between 

V

P

  and GND should not exceed 10V. 

•

  For noise countermeasure, connect a 0.1

μ

F capacitor between V

dd

 and GND pins near the 

connector. 

•

  Make the wire resistance between the power supply (

V

P

  and GND) and the printer (connecting 

terminals) as small as possible (below 50m

Ω

).    Keep distance from signal lines to reduce electrical 

interference. 

•

  Keep the V

P

 power off while not printing in order to prevent the thermal head from electrolytic 

corrosion.    In addition, design the product so that the Signal Ground (SG) of the thermal head and 
the Frame Ground (FG) of the printer become the same electric potential. 

•

  Use C-MOS IC chips for CLK, 

LAT

, DI and 

DST

  signals of the thermal head. 

•

  When turning the power on or off, or during not printing, always disable the 

DST

 terminals. 

•

  To prevent the thermal head from being damaged by static electricity, the printer main body and the 

platen block are connected to Frame Ground (FG) of the outer case.    See Chapter 6 “OUTER CASE 
DESIGN GUIDE” for the connecting method.    Verify the performance with your actual device. 

•

  Always detect the outputs of the platen position sensor and out-of-paper sensor.    Never activate the 

thermal head when the platen block is in open state and when there is no thermal paper.    Incorrect 
activation of the thermal head may reduce the life of the thermal head and the platen and may 
damage them. 

•

  A pause time between thermal head activations of the same heat element shall be secured more than 

0.5ms.    Pay attention to when using one division printing or when a thermal head activation time 
becomes longer.    If activating for a long time without the pause time, the thermal head may become 
damaged. 

•

  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 shown in Chapter 3 “CONTROLLING THE 
ACTIVATION PULSE WIDTH FOR THERMAL HEAD”. 

•

  Noise and vibration during printing vary depending on the motor pulse rate.    Verify the performance 

with your actual device. 

•

  Paper feed force can be decreased depending on the motor pulse rate.    Verify the performance with 

your actual device. 

•

  Do not perform continuous printing to prevent the motor from overheating.    Refer to Chapter 3 

“Motor Drive Method” to set a pause time. 

•

  Paper feeding may be confused with several dot lines when printing is started from waiting status.   

When printing and paper feeding are interrupted and then started printing, as this may cause the 
paper feeding be confused.    It especially affects printing of bit images.    Always feed the thermal 
paper for more than 48 steps at start up or do not interrupt printing. 

•

  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 
block, and a time after cutting with a tea bar. 

Summary of Contents for LTPD247A

Page 1: ...LTPD247A B LTPD347A B THERMAL PRINTER MECHANISM TECHNICAL REFERENCE U00113137700 ...

Page 2: ...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 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 includin...

Page 3: ...ions Read it thoroughly before designing so that you are able to use the product properly SII has not investigated the intellectual property rights of the sample circuits included in this technical reference Fully investigate the intellectual property rights of these circuits before using In particular SII reserves the industrial property rights for the heat storage simulation described in Chapter...

Page 4: ...ctrical Characteristics of Thermal Head 3 18 3 4 4 Timing Chart 3 20 3 4 5 Thermal Head Heat Element Resistance 3 20 3 4 6 Maximum Current Consumption 3 21 3 5 CONTROLLING THE ACTIVATION PULSE WIDTH FOR THERMAL HEAD 3 22 3 5 1 Calculation of Activation Pulse Width 3 22 3 5 2 Calculation of Printing Energy 3 23 3 5 3 Adjustment of Thermal Head Resistance 3 25 3 5 4 Adjustment of Thermal Head drive ...

Page 5: ...ng the Platen Block 6 6 6 3 CONNECT THE PRINTER TO FRAME GROUND FG 6 7 6 3 1 How to Connect the Printer to Frame Ground FG 6 7 6 4 DESIGN THE PLATEN RELEASE LEVER 6 8 6 5 LAYOUT OF THE PRINTER AND PAPER 6 9 6 6 WHERE TO MOUNT THE PAPER HOLDER 6 10 6 7 DESIGN PAPER EXIT 6 11 6 7 1 Design the Shape of the Paper Exit 6 11 6 7 2 Design the Paper Cutter 6 12 6 8 PRECAUTIONS FOR DESIGNING THE OUTER CASE...

Page 6: ...racteristics of Thermal Head LTPD247 3 18 Table 3 10 Electrical Characteristics of Thermal Head LTPD347 3 19 Table 3 11 Thermal Head Heat Element Resistance 3 20 Table 3 12 Standard printing energy and Temperature coefficient 3 23 Table 3 13 Activation Pulse Width 3 25 Table 3 14 Temperature Characteristics 3 27 Table 3 15 Out of paper Sensor 3 29 Table 3 16 General Specifications of Platen Positi...

Page 7: ...re 6 2 Dimensions for Positioning and Securing the Printer Main Body LTPD247B 6 2 Figure 6 3 Dimensions for Positioning and Securing the Printer Main Body LTPD347A 6 3 Figure 6 4 Dimensions for Positioning and Securing the Printer Main Body LTPD347B 6 3 Figure 6 5 Dimensions for Positioning and Securing the Platen Block 6 5 Figure 6 6 External Dimensions and Motion of the Platen Release Lever 6 8 ...

Page 8: ...ess such damages and or loss originate from the printer itself SII has not investigated the intellectual property rights of the sample circuits included in this technical reference Fully investigate the intellectual property rights of these circuits before using The printer is designed and manufactured to be mounted onto general electronic equipment If high reliability is required of the printer i...

Page 9: ... thermal head to cool before cleaning In order to allow cooling secure clearance between the thermal head and the outer case when designing the outer case Precautions for rising temperatures of the motor Temperature of the motor and its peripherals rises very high during and immediately after printing Be sure to design the outer case to prevent users from burn injuries by touching them Place warni...

Page 10: ...in open state and when there is no thermal paper Incorrect activation of the thermal head may reduce the life of the thermal head and the platen and may damage them A pause time between thermal head activations of the same heat element shall be secured more than 0 5ms Pay attention to when using one division printing or when a thermal head activation time becomes longer If activating for a long ti...

Page 11: ...pace to allow the users to handle surrounding the operation portion the platen release lever easily with fingers Otherwise the printer unit will be inoperable If designing the outer case with a structure to bring the platen block up automatically using a spring property after released make sure not to apply more than enough force to bring the platen block up If designing a structure that the only ...

Page 12: ... The print defect may occur When setting the platen block the reduction gear may interfere with the platen gear and may cause the platen block to not be set In such a case release the platen block and set it again Never pull out the thermal paper while the platen block is set The printer may become damaged When handling the printer make sure to use antistatic clothing and to ground yourself to pre...

Page 13: ...ire The printer is not dust proof If use the printer in a dusty place it may damage the thermal head or paper drive system Do not use the printer in corrosive gas and siloxane atmosphere as it may cause the contact failure 1 2 3 Precautions on Discarding When discarding used printers discard them according to the disposal regulations and rules of each respective district ...

Page 14: ...71 0mm x D30 0mm x H15 0mm LTPD247B Dimensions W71 0mm x D15 0mm x H30 0mm LTPD247A B Mass approx 56 g LTPD347A Dimensions W91 0mm x D30 0mm x H15 0mm LTPD347B Dimensions W91 0mm x D15 0mm x H30 0mm LTPD347A B Mass approx 64 g High print speed LTPD247A B Maximum 200mm s print is available LTPD347A B Maximum 150mm s print is available Easy operation Platen block open mechanism provides easy paper i...

Page 15: ...y activated dots 288 dots Resolution W8 dots mm x H8 dots mm Paper feed pitch 0 0625mm Maximum print speed 200mm s 1 150mm s 1 Print width 54mm 72mm Paper width mm 58 0 1 mm 80 0 1 Thermal head temperature detection Thermistor Platen position detection Mechanical switch Out of paper detection Reflection type photo interrupter Operating voltage range VP line Vdd line 21 6to 26 4V 2 7 to 3 6V 4 75 t...

Page 16: ...aper hold force 0 98N 100gf or more Dimensions excluding convex part W71 0mm D30 0mm H15 0mm W71 0mm D15 0mm H30 0mm W91 0mm D30 0mm H15 0mm W91 0mm D15 0mm H30 0mm Mass approx 56g approx 64g Specified thermal paper Nippon Paper Oji Paper Mitsubishi Paper mills limited Jujo Thermal Mitsubishi Hi Tech Paper Papierfabrik August Koehler AG KSP KANZAN TF50KS E2D TP50KJ R TL69KS LH PD160R 63 PD160R N P...

Page 17: ...shows print area Figure 3 1 Heat Element Dimensions 58 0 1 mm Paper Width 5 mm 48 mm Printing Width 5 mm Figure 3 2 Print Area 0 0625mm 0 125mm 0 125mm 48mm 384dot Amm B dots LTPD247 A 54 B 432 LTPD347 A 72 B 576 DDOTBlo LTPD247 A 54 C 58 D 2 LTPD347 A 72 C 80 D 4 D mm A D mm C 0 125mm ...

Page 18: ...eral Specifications of the Step Motor Specifications Item LTPD247 LTPD347 Type PM type step motor Drive method Bi polar chopper Excitation 2 2 phase Winding resistance per phase 26Ω phase 10 Motor drive voltage VP 21 6 to 26 4V Motor controlled current 220 mA phase 200 mA phase Drive pulse rate 3200pps max 2400pps max ...

Page 19: ...F 4 7kΩ 25 6 26 10 2 1500pF 12 19 0 4Ω 1 0 125W 18 13 1 15 16 22 23 24 30 3 11 14 20 17 Recommended motor driver TB6562AFG Toshiba Figure 3 3 Sample Drive Circuit LTPD247 Printer Connecting Terminals PH1 PH2 PH3 PH4 MCL1 TB6562AFG PHASEA VCC PHASEB VCC X1A VCC X2A GND X1B GND X2B GND SB GND GND VREG GND OSC GND GND GND GND VREFA OUT1A VREFB OUT2A OUT1B OUT2B RSA RSB 9 10μF 35V Vp 4 7kΩ FUSE 1A 7 8...

Page 20: ...der of step 1 step 2 step 3 step 4 step 5 step 6 step7 step 8 step 1 step 2 as shown in Table 3 3 PH3 PH4 H L H L PH1 PH2 H L H L H L MCL1 1 dot line START STEP 1 dot line 1 dot line Set MCL1 to High while the motor is driven Figure 3 5 Input Voltage Waveforms for the Sample Drive Circuit Table 3 3 Excitation Sequence Input signal Output signal PH1 PH2 PH3 PH4 A B A B Step 1 L H L L L H H L Step 2...

Page 21: ...on step To restart the motor from the stop step immediately shift the motor to the sequence of print step 2 Stop step To stop the motor excite the same phase as the last one in the printing step for 20ms 3 Pause state In the pause state do not excite the motor to prevent to the motor from overheating Even when the motor is not excited holding torque of the motor prevents the paper from moving Inpu...

Page 22: ...e acceleration step time until the thermal head activation has been completed In the case of reducing the motor speed the deceleration control based on the estimated motor speed is required for preventing paper feed failure caused by the steep change of the motor speed Decelerate the speed properly otherwise the motor may not rotate properly due to the steep change of the motor speed To prevent th...

Page 23: ... of row of acceleration step to decelerate from current acceleration step number to next step an using the following equation a20 20 60 120 3 According to the maximum value a20 3 by calculated value of an a1 to a40 next acceleration step time of the next step should be 317μs at the 117th acceleration step which reduced the row by three rows from the current 120th acceleration step If the actual th...

Page 24: ...1802 555 9 827 1209 40 1826 548 10 876 1141 41 1850 541 11 923 1083 42 1873 534 12 968 1033 43 1896 528 13 1011 989 44 1918 521 14 1052 951 45 1940 515 15 1092 916 46 1963 510 16 1130 885 47 1984 504 17 1167 857 48 2006 499 18 1203 831 49 2027 493 19 1238 808 50 2048 488 20 1272 786 51 2069 483 21 1305 766 52 2090 478 22 1338 748 53 2111 474 23 1369 730 54 2131 469 24 1400 714 55 2151 465 25 1430 ...

Page 25: ...1 100 2917 343 71 2451 408 101 2932 341 72 2469 405 102 2947 339 73 2486 402 103 2962 338 74 2503 399 104 2976 336 75 2520 397 105 2991 334 76 2538 394 106 3005 333 77 2554 391 107 3019 331 78 2571 389 108 3034 330 79 2588 386 109 3048 328 80 2605 384 110 3062 327 81 2621 382 111 3076 325 82 2638 379 112 3090 324 83 2654 377 113 3104 322 84 2670 375 114 3118 321 85 2686 372 115 3132 319 86 2702 37...

Page 26: ...39 1352 740 9 620 1613 40 1370 730 10 657 1522 41 1387 721 11 692 1444 42 1405 712 12 726 1378 43 1422 703 13 758 1319 44 1439 695 14 789 1267 45 1455 687 15 819 1221 46 1472 679 16 847 1180 47 1488 672 17 875 1142 48 1504 665 18 902 1108 49 1520 658 19 929 1077 50 1536 651 20 954 1048 51 1552 644 21 979 1022 52 1568 638 22 1003 997 53 1583 632 23 1027 974 54 1598 626 24 1050 952 55 1613 620 25 10...

Page 27: ... 548 100 2188 457 71 1838 544 101 2199 455 72 1851 540 102 2210 452 73 1864 536 103 2221 450 74 1877 533 104 2232 448 75 1890 529 105 2243 446 76 1903 525 106 2254 444 77 1916 522 107 2265 442 78 1928 519 108 2275 440 79 1941 515 109 2286 437 80 1953 512 110 2296 435 81 1966 509 111 2307 433 82 1978 506 112 2318 431 83 1990 502 113 2328 430 84 2003 499 114 2338 428 85 2015 496 115 2349 426 86 2027...

Page 28: ...d a pause time of the motor Table 3 6 Maximum Drive Time and Drive Ratio Motor drive voltage Vp V Drive pulse rate pps Maximum continuous drive time s Drive ratio 400 to 800 40 0 52 800 to 1200 20 0 55 1200 to 1600 14 0 56 1600 to 2000 13 0 50 2000 to 2400 8 0 50 2400 to 2800 7 0 53 2800 to 3200 6 0 54 3200 5 0 50 100 Time Pause Time Drive Time Drive Ratio Drive ...

Page 29: ...imes of the motor See Chapter 5 PRINT DRIVE METHOD for details Do not feed the thermal paper backwards no more than 9mm Surface of thermal paper may get scratched by backward feed The backward feed may cause paper skew and jams depending on paper roll layout and designing of paper holder Be sure to confirm performance with your product before using the backward feed Do not print intermittently Do ...

Page 30: ...7 a division printing by 3 blocks is available Each block has 144 dots heat elements In the LTPD347 a division printing by 144 dots in 4 block each are available The divided printing is effective for a high print ratio printing because the peak current can be cut down with the reduction of the average print speed 3 4 1 Structure of the Thermal Head Figure 3 7 shows the thermal head block diagram w...

Page 31: ...ting Element Number Dots DST 1 DST1 1 to 144 144 2 DST2 145 to 288 144 3 DST3 289 to 432 144 4 DST4 433 to 576 144 3 4 2 Print Position of the Data 432 bit data 1 to 432 transferred through DI terminals are printed when driving the LTPD247 as shown in Figure 3 8 Figure 3 8 Print Position of the Data LTPD247 LTPG247 printer mechanism 1 2 3 4 5 6 430 431 432 Paper feed direction Print surface Data P...

Page 32: ... Vdd 0 5 μA 2 7V Vdd 3 6V 16 μA DST input current High active Low IIL DST VIL 0V 4 75 Vdd 5 25V 24 5 μA High IIH CLK VIH Vdd 1 5 μA CLK input current Low IIL CLK VIL 0V 1 5 μA High IIH LAT VIH Vdd 1 5 μA LAT input current Low IIL LAT VIL 0V 1 5 μA 2 7V Vdd 3 6V 8 MHz CLK frequency f CLK 4 75 Vdd 5 25V 16 MHz 2 7V Vdd 3 6V 56 ns CLK pulse width t1 See the Timing Chart 4 75 Vdd 5 25V 28 ns 2 7V Vdd ...

Page 33: ...IIL DST VIL 0V 4 75 Vdd 5 25V 24 5 μA High IIH CLK VIH Vdd 2 0 μA CLK input current Low IIL CLK VIL 0V 2 0 μA High IIH LAT VIH Vdd 2 0 μA LAT input current Low IIL LAT VIL 0V 2 0 μA 2 7V Vdd 3 6V 8 MHz CLK frequency f CLK 4 75 Vdd 5 25V 16 MHz 2 7V Vdd 3 6V 56 ns CLK pulse width t1 See the Timing Chart 4 75 Vdd 5 25V 28 ns 2 7V Vdd 3 6V 30 ns DI setup time t2 See the Timing Chart 4 75 Vdd 5 25V 15...

Page 34: ...ming chart t1 t6 t2 t3 t4 t7 CLK DI LAT DST 1 fCLK t5 t8 Figure 3 9 Thermal Head Drive Timing Chart 3 4 5 Thermal Head Resistance Table 3 11 shows resistance of the thermal head of the printer Table 3 11 Thermal Head Resistance Thermal Head Resistance 1455 to 1545Ω ...

Page 35: ...neously 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 Equation 1 min H P SA P R V N I IP Maximum current consumption A NSA Number of simultaneously activated dots VP Thermal head drive voltage V RH min Minimum thermal head heat element resistance 1455 Ω ...

Page 36: ...tivation pulse width may shorten the life of the thermal head 3 5 1 Calculation of Activation Pulse Width Each value can be calculated according to the steps in Section 3 5 2 to 3 5 6 and the activation pulse width t can be calculated by substituting each value into the equation 2 Equation 2 C V R E t 2 t Thermal head pulse width ms E Printing energy mJ See section 3 5 2 R Adjusted resistance Ω Se...

Page 37: ...t LTPD247 Temperature coefficient Thermal paper Standard printing energy mJ Less than 25 C 25 C or higher TF50KS E2D 0 2998 0 002651 0 004241 TP50KJ R 0 3341 0 002057 0 004333 Nippon Paper TL69KS LH 0 3838 0 001087 0 003272 PD160R 63 0 2865 0 001427 0 003096 Oji Paper PD160R N 0 2943 0 000689 0 002767 Mitsubishi Paper mills limited P220VBB 1 0 3134 0 003714 0 003390 AP50KS D 0 3439 0 001930 0 0052...

Page 38: ...270 0 001291 0 003487 Mitsubishi Paper mills limited P220VBB 1 0 3134 0 003714 0 003390 AP50KS D 0 3126 0 000957 0 003835 Jujo Thermal AF50KS E 0 3074 0 001384 0 003838 F5041 0 3901 0 002321 0 004551 Mitsubishi Hi Tech Paper P5045 0 3458 0 005085 0 004132 Papierfabrik August Koehler AG KT55F20 0 3725 0 002190 0 004733 P300 0 3972 0 002115 0 004878 P350 0 3689 0 004347 0 004900 P350 2 0 0 3678 0 00...

Page 39: ... relay between control terminal and power supply 3 5 4 Adjustment of Thermal Head drive Voltage The adjusted voltage V can be calculated using equation 5 as the printing density changes by the difference of the thermal head drive voltage Equation 5 0 598 V 0 968 V P VP Thermal head drive voltage V 3 5 5 Setting of Activation Pause Time In order to protect the thermal head heat elements when the sa...

Page 40: ...icient C can be calculated using equations 7 as the printing density varies by the thermal head activation pulse cycle equivalent for motor drive pulse rate Equation 7 when 2 step driving cycle is lower than 2640 μs C 10 W 132 151 6 0 360 when 2 step driving cycle is 2640 μs and higher C 10 W 80 812 6 0 496 ...

Page 41: ...977 0 831 0 749 0 678 0 630 0 596 0 570 0 550 0 534 0 521 0 510 0 501 0 493 0 486 0 480 30 0 869 0 739 0 667 0 603 0 560 0 530 0 507 0 489 0 475 0 464 0 454 0 446 0 439 0 433 0 427 40 0 737 0 627 0 565 0 511 0 475 0 449 0 430 0 415 0 403 0 393 0 385 0 378 0 372 0 367 0 362 50 0 605 0 514 0 464 0 419 0 390 0 369 0 353 0 340 0 331 0 323 0 316 0 310 0 305 0 301 0 297 60 0 472 0 402 0 362 0 328 0 304 ...

Page 42: ...in Figure 3 10 and Table 3 15 Equation 8 298 1 T 273 1 B EXP R R X 25 X RX Resistance at TX C Ω R25 Resistance at 25 C 30 5 kΩ B B value 3950 2 K TX Temperature detected by thermistor C EXP A The A th power of natural logarithm e 2 71828 1 10 100 1000 20 15 10 5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 温度 サーミスタ抵抗値 kΩ Figure 3 10 Thermistor Resistance vs Temperature Temperature...

Page 43: ...rature C Thermistor Resistance kΩ 20 316 97 15 234 22 10 175 07 5 132 29 0 100 99 5 77 85 10 60 57 15 47 53 20 37 61 25 30 00 30 24 11 35 19 51 40 15 89 45 13 03 50 10 75 55 8 92 60 7 45 65 6 25 70 5 27 75 4 47 80 3 80 85 3 25 90 2 79 95 2 41 100 2 09 ...

Page 44: ...to be activated by malfunction of the control unit CPU the software for detecting abnormal temperatures may not function properly resulting in overheating of the thermal head Overheating of the thermal head not only may damage the thermal head but also may cause smoke fire and burn injuries Always use hardware together with software for detecting abnormal temperatures to ensure personal safety If ...

Page 45: ...motor is driven when there is no paper a load is put on the paper drive system and the life of the printer may be shortened significantly Table 3 16 shows about the out of paper sensor used for this printer Table 3 16 Out of paper Sensor Item Specification Type NJL5902R Rank B Manufacturer New Japan Radio Co Ltd Figure 3 11 shows sample external control circuit of the out of paper sensor The PS si...

Page 46: ...e state by detecting the output from the paper sensor The hair may get caught in the exposed platen and the gear if the motor is driven when the platen block is in open state 3 7 1 General Specifications Table 3 17 shows about the general specification Table 3 17 General Specifications of Platen Position Sensor Item Specification Rated voltage DC5 0V Rated current 1mA Contact resistance 3Ω max Fig...

Page 47: ...ly to the external circuits Table 4 1 Recommended Connectors Number of Terminals Recommended Connectors 50 MOLEX INC 0541045031 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 and Table 4 3 show terminal assignments of the connecting terminals 1 50 Figure 4 1 Connecting Terminals ...

Page 48: ...put 8 CLK Synchronizing signal for print data transfer 9 GND GND 10 GND GND 11 GND GND 12 GND GND 13 GND GND 14 GND GND 15 NC No connection 16 NC No connection 17 DST3 Thermal head print activation instruction signal 3 block 18 Vdd Logic power supply 19 TH2 Thermistor the one is used for GND 20 TH2 Thermistor the one is used for GND 21 TH1 Thermistor 22 NC No connection 23 DST2 Thermal head print ...

Page 49: ...ower supply 37 VP Thermal head drive power supply 38 N C No connection 39 PS Output signal of the paper sensor Photo transistor collector 40 VPS Power supply of the paper sensor LED anode 41 GND GND of the paper sensor LED cathode photo transistor emitter Platen position sensor GND 42 HS Platen position sensor output 43 N C No connection 44 FG FG 45 FG FG 46 N C No connection 47 A Motor drive sign...

Page 50: ... signal for print data transfer 9 GND GND 10 GND GND 11 GND GND 12 GND GND 13 GND GND 14 GND GND 15 N C No connection 16 DST4 Thermal head print activation instruction signal 4 block 17 DST3 Thermal head print activation instruction signal 3 block 18 Vdd Logic power supply 19 TH2 Thermistor the one is used for GND 20 TH2 Thermistor the one is used for GND 21 TH1 Thermistor 22 NC No connection 23 D...

Page 51: ...ower supply 37 VP Thermal head drive power supply 38 N C No connection 39 PS Output signal of the paper sensor Photo transistor collector 40 VPS Power supply of the paper sensor LED anode 41 GND GND of the paper sensor LED cathode photo transistor emitter Platen position sensor GND 42 HS Platen position sensor output 43 N C No connection 44 FG FG 45 FG FG 46 N C No connection 47 A Motor drive sign...

Page 52: ...g chart for driving using fixed two division printing Figure 5 2 shows a timing chart for driving using one division printing Figure 5 1 Timing Chart for Driving Using Two Divisions LTPD247 CLK Dl LAT PH1 2nd dot line 1st step MCL1 PH4 PH3 PH2 4th dot line 1st step 4th dot line 2nd step 3rd dot line 1st step 3rd dot line 2nd step Pause Start 1st dot line 1st step 1st dot line 2nd step 2nd dot line...

Page 53: ... DST3 After 1 step of the motor drive signal is completed input the 2nd step of the motor drive signal It is not necessary to synchronize the activation of the thermal head Input the DST signal previously transfer the data which is printed into the SHIFT REGISTER in the thermal head And latch to LATCH REGISTER of the thermal head by inputting the LAT signal 4 Procedures that follows the 2nd dot li...

Page 54: ... at the same time are predetermined for the fixed division method In this method high quality printing is available because the physical blocks are always driven in the same order 2 Dynamic division 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...

Page 55: ...head activations of the same heat element shall be secured more than 0 1ms The number of the maximum thermal head division in one dot line should be 6 or lower for LTPD247 and 8 or lower for LTPD347 to maintain print quality The number of the simultaneously activated dots should be 288 dots or less ...

Page 56: ...uter case to position the printer main body for the positioning holes 1 and 2 LTPD247A LTPD347A or 2 and 3 LTPD247B LTPD347B The height of the bosses on the outer case must be 1 5mm Max Secure by screw at the U shaped screwing position c Design the fixing hook to the part of a and b The motors of the LTPD247B and the LTPD347B locate at the bottom of the each printer In order to avoid interfering w...

Page 57: ...ter case for printer main body mounting O 2 3 0 0 5 13 4 0 5 24 65 0 5 6 2 35 75 0 5 3 75 Max 36 75 Min 3 15 Paper Center 20 7 O 2 1 0 0 5 Unit mm General tolerance 0 1 Figure 6 2 Dimensions for Positioning and Securing the Printer Main Body LTPD247B 25 7 12 7 2 O 2 3 0 05 2 1 0 05 O 3 O 2 1 0 05 23 7 0 5 1 5 6 a b c 1 3 29 65 0 5 6 Outer case for printer main body mounting 30 75 0 5 8 15 Paper Ce...

Page 58: ...cured for the motor Outer case for printer main body mounting 2 14 15 Paper Center 43 3 75 Max 34 75 0 5 46 65 0 5 6 35 75 Min O 2 1 0 0 5 Unit mm General tolerance 0 1 Figure 6 4 Dimensions for Positioning and Securing the Printer Main Body LTPD347B 2 12 7 2 1 0 05 O 2 1 0 05 O 2 3 0 05 O 3 23 7 0 5 1 5 19 15 Paper center 6 29 75 0 5 48 c 1 3 b a Outer case for printer main body mouting 51 65 0 5...

Page 59: ...rom excessive stress deformation and torsion for securing the printer otherwise poor printing quality paper skewing paper jamming and noise during printing may be caused The printer main body to be mounted on a flat surface and prevent from vibration Pay attention not to damage on the FPC when securing the printer main body ...

Page 60: ...and 5 The height of the bosses on the door must be 1 0mm Max Secure the platen block using the screw holes d and e Unit mm General tolerance 0 1 Figure 6 5 Dimensions for Positioning and Securing the Platen Block Table 6 1 Allowable Dimensions Allowable X1 dimension Allowable X2 dimension Allowable Y dimension 5 65 to 6 05 10 65 to 11 05 9 3 to 9 7 2 1 0 05 O 3 2 O 2 1 0 0 5 B 9 5 Y dimension The ...

Page 61: ...n for securing the platen block Design the door and the outer case strong enough to keep the allowable dimensions because stress is applied to them when setting and releasing the platen block The rotation center of the door should be designed to fit the rotational shaft into the shaft hole so that the platen block should be stable when it is in the close state If the printer main body and the plat...

Page 62: ...through the Frame Ground FG of the circuit board When the printer main body is connected make the shortest possible position of the printer connecting terminals and the Frame Ground FG of the outer case And those are not effect to the control signal If using a sheet metal material for the door the door should also be connected to the frame ground FG of the interface board All Frame Ground FG must ...

Page 63: ... lever is pushed to an angle of 9 degrees of the released position Design the stopper in the outer case to prevent the lever from being damaged when the extraordinary force is applied to the platen release lever Design the button or the lever so that no load is constantly applied to it while the platen block is set Unit mm General tolerance 0 5 Figure 6 6 External Dimensions and Motion of the Plat...

Page 64: ...g direction of the thermal paper Figure 6 7 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 8 3mm Platen Out of paper sensor Paper roll Thermal head Printer mechanism Printer mounting plate Thermal head heat elements ...

Page 65: ...the paper roll wobbles in the paper holder In case that tension of the thermal paper between the paper roll and the printer changes rapidly In addition do not use following types of thermal paper Expanded paper roll Deformed paper roll Roll core is sticking out Width of the paper roll is out of spec When the thermal paper feeds backwards design the space for the thermal paper returns to the paper ...

Page 66: ...er exit of the outer case and the door so that the thermal paper coming out angle must be within of 50 to 85 as shown inFigure 6 9 The paper exit design should not interfere with the thermal paper coming out Design the paper exit not to change thermal paper coming out direction and not interfere with paper feeding 10 7 O 7 9 5 0 8 5 0 35 1 90 Paper insert angle 90 35 Paper coming out direction Uni...

Page 67: ... than paper holding force Design the blade edge of the cutter as shown in the right figure of Figure 6 10 so that the blade edge can guide the thermal paper edge after cutting If designing the blade edge as shown in the left figure the paper edge may be caught by the blade edge and result in the thermal paper edge to be caught inside of the cutter Set the paper cutter to a position that allows to ...

Page 68: ...d also may damage the printer mechanism Secure 1 0mm min space between the printer main body and platen block and the outer case Temperature of the thermal head and its peripherals rises very high during and immediately after printing Be sure to design the outer case to prevent users from burn injuries by touching them Place warning labels to warn users to ensure safe operation As for thermal head...

Page 69: ... platen block for LTPD247 and Figure 7 2 and Figure 7 3 show external dimensions of the printer LTPD247A and LTPD247B Figure 7 4 shows external dimensions of the platen block for LTPD347 and Figure 7 5 and Figure 7 6 show external dimensions of the printer LTPD347A and LTPD347B ...

Page 70: ...15 34 0 1 28 0 1 6 0 1 15 95 2 1 0 05 O 3 O 3 2 6 2 59 9 1 5 Range of platen motion 4 3 0 1 1 5 O 2 1 0 0 5 8 8 12 528 68 25 Unit mm General tolerance 0 5 Figure 7 1 External Dimensions of the Platen Block LTPD247 ...

Page 71: ...25 5 1 0 05 4 3 0 1 10 7 0 1 71 15 3 5 1 M2 burring 26 75 2 4 2 0 8 0 04 t O 7 9 3 8 Paper Inlet Position O 3 O 2 3 0 0 5 O 2 O 2 1 0 0 5 1 48 Paper Inlet position 5 1 2 65 Section A A 38 7 27 5 30 75 37 3 4 54 21 0 1 58 3 0 1 Paper Inlet Width 3 8 0 1 1 5 Unit mm General tolerance 0 5 Figure 7 2 External Dimensions of the Printer LTPD247A ...

Page 72: ... 23 7 A A 3 8 Paper Inlet Position O 2 40 Paper Inlet Angle 1 48 Paper Inlet Position Section A A 2 65 4 3 24 95 15 10 7 0 1 O 7 9 O 2 1 0 0 5 1 5 26 0 1 58 3 0 1 Paper Inlet Width 21 75 2 7 15 0 1 10 85 0 2 20 7 0 1 28 8 5 1 24 65 35 75 3 8 0 1 9 5 0 2 Unit mm General tolerance 0 5 Figure 7 3 External Dimensions of the Printer LTPD247B ...

Page 73: ...ge of platen motion 8 8 4 3 0 1 1 5 12 528 6 3 79 7 88 3 O 2 1 0 05 82 1 16 05 56 0 1 50 0 1 6 0 1 14 85 2 1 0 05 O 3 O 3 2 Unit mm General tolerance 0 5 Figure 7 4 External Dimensions of the Platen Block LTPD347 ...

Page 74: ... 3 30 1 0 05 3 2 4 54 25 5 21 0 1 80 3 0 1 Paper Inlet Width 91 5 1 3 0 8 0 04 t 4 2 1 0 05 4 3 0 1 10 7 0 1 O 2 15 11 7 26 75 2 A A O 7 9 3 8 Paper Inlet Position 1 48 Paper Inlet Position 40 Paper Inlet Angle Section A A 9 5 0 2 37 3 3 8 0 1 O 2 1 0 0 5 Unit mm General tolerance 0 5 Figure 7 5 External Dimensions of the Printer LTPD347A ...

Page 75: ... 0 1 15 91 5 1 3 0 8 0 04 t 4 2 M2 burring O 7 9 3 8 Paper Inlet Position 1 48 Paper Inlet Position O 2 3 0 0 5 40 Paper Inlet Angle Section A A 9 5 0 2 O 2 52 3 O 2 1 0 0 5 25 5 26 0 1 21 75 2 46 65 6 0 1 34 75 3 8 0 1 43 0 1 27 8 14 15 0 1 10 85 0 2 Unit mm General tolerance 0 5 Figure 7 6 External Dimensions of the Printer LTPD347B ...

Page 76: ...e platen release lever in the direction of the arrow in the Figure 8 1 Figure 8 1 Loading the Thermal Paper 1 Pull up the platen block after making sure that the platen block is released from the printer main body Open state Set the thermal paper straight to the printer and leave at least 5cm of the thermal paper come out from the printer in the Figure 8 2 Platen block Platen release lever ...

Page 77: ...th the platen block released Automatic loading is not allowed Set the thermal paper straight to the printer and leave at least 5 cm of the thermal paper come out from the printer When setting the platen block the reduction gear may interfere with the platen gear and may cause the platen block to not be set In such a case release the platen block and set it again If the thermal paper is skewed feed...

Page 78: ...in body Clean the heat element shown in Figure 8 3 using a cotton swab dipped in ethyl alcohol or isopropyl alcohol Set the platen block after the alcohol has dried completely Figure 8 3 Cleaning Position of the Thermal Head 8 2 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 ...

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