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3-24 

3.6.8  Thermistor Resistance

 

  

 

 

 
The resistance of the thermistor at the operating temperature T

X

 (

°

C) is determined using the following 

equation (10). 
 
Equation (10): 

−

+

×

×

298

1

T

273

1

B

EXP

R

-

R

X

25

X

 

 
 

R

X

: 

 

Resistance at operating temperature Tx (

°

C) 

 

R

25

: 

 

15 k

Ω

 

±

 10% (25

°

C) 

 

B: 

 

3440 K 

±

 3% 

 

T

X

: 

 

Operating temperature (

°

C) 

 

EXP (A):   

The Ath power of natural logarithm e (2.71828) 

 
 

[Rating] 

 

 

 

Operating temperature range:  -40

°

C to +125

°

C 

 
 

 

 

Figure 3-11  Thermistor Resistance vs. Temperature 

 

R 
E 
S 

I 

S 

T 

A 
N 
C 
E 

(K

Ω

Ω

Ω

Ω

) 

R

E

S

IS

T

A

N

C

E

 (

k

ΩΩΩΩ

) 

TEMPERATURE (

°°°°

C) 

= 

Содержание LTP1245R-C384-E

Страница 1: ...LTP1245X X384 E LINE THERMAL PRINTER MECHANISM TECHNICAL REFERENCE U00085320001 Seiko Instruments Inc...

Страница 2: ...s 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...

Страница 3: ...noted and if the information is different depending on the model specific model name is mentioned clearly Chapter 1 Precautions describes safety design and operational precautions Read it thoroughly b...

Страница 4: ...iv...

Страница 5: ...5 Peak Current 3 17 3 5 6 Thermal Head Electrical Characteristics 3 18 3 5 7 Timing Chart 3 19 3 6 CONTROLLING THE HEAD ACTIVATION DST PULSE WIDTH 3 20 3 6 1 Calculation of the Head Activation Pulse W...

Страница 6: ...4 WHERE TO MOUNT THE PAPER CUTTER 6 2 6 5 OUTER CASING STRUCTURE 6 3 CHAPTER 7 APPEARANCE AND DIMENSIONS CHAPTER 8 LOADING UNLOADING PAPER AND HEAD CLEANING 8 1 LOADING UNLOADING PAPER PRECAUTIONS 8...

Страница 7: ...Load 3 29 3 15 Model Code Label 3 30 4 1 Thermal Head Control Terminals FFC 4 2 4 2 Motor and Detector Terminals FPC 4 3 5 1 Example of Timing Chart of the Thermal Head Driving 5 1 5 2 Example of Mot...

Страница 8: ...Head Voltage 3 17 3 8 Thermal Head Electrical Characteristics 3 18 3 9 Activation Pulse Width 3 23 3 10 Temperature and Corresponding Thermistor Resistance 3 25 3 11 Detector s Status and Output Sign...

Страница 9: ...rsonal injury the printer should be controlled so that the detection of abnormal temperatures of the thermal head is performed as described in Section 3 6 9 Turn printer off immediately if abnormal co...

Страница 10: ...to prevent the thermal head from becoming electrically corroded In addition design the printer so that the signal GND of the thermal head and the frame GND of the printer mechanism become the same ele...

Страница 11: ...of the printer and cause damage Handle the printer with the following precautions Also get an operator s attention To prevent the heat elements ICs etc from being damaged due to static electricity ta...

Страница 12: ...come the source of a corroded thermal head If condensed power off the Vp until dried The LTP1245 is not a water proof printer Prevent contact with water and do not perform operations with wet hands Th...

Страница 13: ...light The mechanism is compact and light 72 mm in width 39 5 mm in depth 16 mm in height and approximately 45 g in weight High resolution printing A high density print head of 8 dots mm produces clear...

Страница 14: ...ication It is selectable according to the applications Thermal head cleaning Move the head up lever to open position to clean the thermal head 1 Print speed differs depending on working and environmen...

Страница 15: ...m Head temperature detection Via thermistor Head up detection Via photo interrupter Out of paper detection Via photo interrupter Operating voltage range VP line for head and motor drive Vdd line for h...

Страница 16: ...KS R2 High heat resistant paper from Nippon Paper Industries TL69KS R2 High heat resistant paper from Nippon Paper Industries 5 C to 40 C TW80KK S 2 ply thermal paper 5 7 from Nippon Paper Industries...

Страница 17: ...e LTP1245 contains a thermal head with 384 heat elements dot size Figure 3 1 Heat Element Dimensions Figure 3 2 Print Area 48 mm 384 DOTS 0 125 mm 0 125 mm 58 mm PAPER WIDTH 48 mm PRINTING WIDTH 5 mm...

Страница 18: ...ation 1 Vp 165 220 pps max 1000 pps When at lower than 5 C 300 pps During printing motor drive frequency should be adjusted according to working conditions such as voltage temperature number of activa...

Страница 19: ...Bipolar chopper Excitation 2 2 phase Winding resistance per phase 14 10 Rated voltage 4 2 8 5 V Rated current 0 23 A phase 0 15 A phase 1 Maximum current consumption 0 46 A Drive frequency 50 1000 pp...

Страница 20: ...13 17 14 13 20 11 1 9 9 8 7 6 15 6 1 15 14 7 6 10 12 12 2 3 18 19 6 15 4 5 0 51 1 1 2W 0 51 1 1 2W 10 F 50V 10 F 50V 1K 1 1K 1 3K 1 3K 1 10K 10K 74HC32 74HC32 NC NC 0 1 F PH1 Vcc Vcc Vcc Vcc Vcc Vcc...

Страница 21: ...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 Table 3 4 Excitation Sequence Signal Name Sequence Step 1 Step 2 Step...

Страница 22: ...tep motor in order to prevent the motor from heating 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...

Страница 23: ...s 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 an...

Страница 24: ...rrent for T1 T1 is defined from each period of the motor drive step and Vp voltage as follows How to define T1 unit s When Vp is under 7 2 V T1 Compare the following two values and adopt the smaller o...

Страница 25: ...1 Start 5 78ms 1st step 5 78ms 2nd step 3 57ms Max speed 300pps 3rd step 3 33ms 4th step 3 33ms 5th step 3 33ms 6th step 3 33ms 230mA Motor speed 300 pps CTCRL1 High First set current 0 23 A Figure 3...

Страница 26: ...leration time 5 After outputting the time calculated using equation 1 the motor is driven at a constant speed The printer can print during acceleration Set the maximum drive speed to 300 pps 3333 s fo...

Страница 27: ...teps Speed pps Step Time s start 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 173 280 362 432 493 547 597 644 687 728 768 805 840 874 907 939 970 1000 5780 5780 3571 2762 2314 2028 1828 1675 1553 1456...

Страница 28: ...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...

Страница 29: ...T2 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 Block2 Block1 Thermistor Figure...

Страница 30: ...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 9 Figure 3 9 Printed Position of the Data LTP1245 PRINT...

Страница 31: ...5 V Head logic voltage Vdd 4 5 to 5 5 V 3 5 5 Peak Current Since the peak current maximum current may reach the values calculated using equation 2 when the thermal head is driven make sure that the a...

Страница 32: ...h input voltage Vih CLK DAT LATCH DST 0 8 Vdd Vdd V Low input voltage Vil CLK DAT LATCH DST 0 0 2 Vdd V CLK 3 A DAT 0 5 A LATCH 3 A High input current DST Iih Ta 25 C Vdd 5 0 V Vih 5 0 V 55 A CLK 3 A...

Страница 33: ...3 19 3 5 7 Timing Chart Figure 3 10 Timing Chart...

Страница 34: ...3 6 4 C Head pulse term coefficient See Section 3 6 6 3 6 2 Calculation of Applied Energy Applied energy should be in accordance with the temperature of the thermal head and the printer s installation...

Страница 35: ...2 1 8 T 0 01 Less than 5 5V V Vp 1 4 2 9 T 0 01 T Thermistor detection temperature C 3 6 4 Adjustment of Head Resistance Adjustment of head resistance is to be in accordance with equation 6 Due to wi...

Страница 36: ...rent activation start which conforms to equation 7 to reserve the pause time Equation 7 W t 0 5 ms W Activation period of 1 dot line ms 3 6 6 Head Activation Pulse Term Coefficient Make adjustments us...

Страница 37: ...1 88 1 80 1 72 1 66 1 60 1 55 10 1 72 1 64 1 57 1 51 1 46 1 42 1 38 20 1 56 1 49 1 42 1 37 1 32 1 28 1 25 1 21 30 1 40 1 33 1 28 1 23 1 19 1 15 1 12 1 09 1 06 7 2 40 1 23 1 18 1 13 1 08 1 05 1 02 0 9...

Страница 38: ...10 Equation 10 298 1 T 273 1 B EXP R R X 25 X RX Resistance at operating temperature Tx C R25 15 k 10 25 C B 3440 K 3 TX Operating temperature C EXP A The Ath power of natural logarithm e 2 71828 Rati...

Страница 39: ...3 83 10 69 71 70 3 30 5 54 61 75 2 86 0 43 17 80 2 48 5 34 42 85 2 17 10 27 66 90 1 90 15 22 40 95 1 67 20 18 27 100 1 47 25 15 00 30 12 40 35 10 31 3 6 9 How to Print Using 2 ply Thermal Paper For f...

Страница 40: ...trol unit CPU malfunctions 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 t...

Страница 41: ...d may be shortened significantly If the thermal head is activated in an out of paper mode the thermal head and platen roller may be damaged Table 3 11 Detector s Status and Output Signals Detector Sta...

Страница 42: ...tric current IC IF 10mA VCE 5V 450 A 1100 A Response time at rise tr IC 1mA VCE 10V 10 s Response time at fall tf RL 1k d 1mm 1 10 s Transfer characteristics Leak current ILEAK IF 10mA VCE 5V 0 2 A 1...

Страница 43: ...lowchart for Automatic Paper Load Head down Paper is present Head up Paper is exhausted Paper is exhausted Paper exists CHECK FOR PAPER START CHECK FOR PAPER Head up down detection Drive the motor in...

Страница 44: ...1245R 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 S...

Страница 45: ...ecommended connectors Table 4 1 Recommended Connectors No External Circuit Functions Number of Pins Recommended Connectors External Circuit side 1 Thermal head control 20 Molex Co Ltd 52044 2045 horiz...

Страница 46: ...Synchronizing signal for data transfer 8 LATCH Input Print data latch memory storage 9 DST6 Input Thermal head print activation instruction signal 10 DST5 Input Thermal head print activation instruct...

Страница 47: ...er Signal Name Function 1 HS Output signal of the head up detector collector output of a photo transistor 2 VHS Power supply of the head up detector LED anode 3 GND GND common ground for the head up a...

Страница 48: ...4 4...

Страница 49: ...of the head activation pulse High of DST drives the heat elements of the thermal head Then let DST go to Low after driving for the period calculated using the formula shown in 3 6 CONTROLLING THE HEA...

Страница 50: ...ST to High set DST to Low when the driving time calculated in 3 6 CONTROLLING THE HEAD ACTIVATION DST PULSE WIDTH has passed Move to the 2nd step after the transfer of print data for the blocks 1 3 an...

Страница 51: ...same manner as the 1st line 2nd 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...

Страница 52: ...Motor Drive Timing Chart A B A B CLK DST 1 3 5 Block 2 4 6 Block 1 3 5 Block 2 4 6 Block 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 TH...

Страница 53: ...in and 2 5 small round flat washer Screws and washers with 6 mm or less outer diameter and 5 mm or less height in accordance with and 6 1 2 Precautions for Securing the Printer Secure the printer with...

Страница 54: ...WHERE TO MOUNT THE PAPER CUTTER Install the paper cutter so that it does not interfere with the paper feed The angles and positions for feeding paper are shown in CHAPTER 7 APPEARANCE AND DIMENSIONS...

Страница 55: ...CTURE 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 Sampl...

Страница 56: ...6 4...

Страница 57: ...7 1 7 APPEARANCE AND DIMENSIONS Figure 7 1 shows the appearance and external dimensions of the LTP1245 CHAPTER...

Страница 58: ...7 2 Figure 7 1 LTP1245R C384 E Appearance and Dimensions Unit mm Tolerance 0 5 mm...

Страница 59: ...7 3 Figure 7 2 LTP1245S C384 E Appearance and Dimensions Unit mm Tolerance 0 5 mm...

Страница 60: ...7 4 Figure 7 3 LTP1245T S384 E Appearance and Dimensions Unit mm Tolerance 0 5 mm...

Страница 61: ...7 5 Figure 7 4 LTP1245U S384 E Appearance and Dimensions Unit mm Tolerance 0 5 mm...

Страница 62: ...7 6...

Страница 63: ...of the paper comes up from between the thermal head and the platen pull the edge of the paper check whether the paper is aligned correctly and place the thermal head into the down position Unloading p...

Страница 64: ...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...

Страница 65: ...riginal position by reversing the steps PRECAUTIONS Do not clean the thermal head immediately after printing bacause thermal head will still be hot Cleaning fluid ethyl alcohol isopropyl alcohol Do no...

Страница 66: ...8 4...

Страница 67: ...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 mechan...

Страница 68: ...commended 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 in Figture 9 1 4 Connect the FPC and FFC of the printer to the main u...

Страница 69: ...lear paper jams To open the autocutter unit lift the part shown in Figure 9 3 Care should be taken to avoid causing damage to the platen Before closing the autocutter unit verify that the print head i...

Страница 70: ...paper feed slit in the autocutter then close the autocutter unit 3 Recording paper removal With the autocutter unit closed turn the head up lever to the position shown in Figure 9 4 release the head a...

Страница 71: ...area A for the next print portion after printing area B and then cut the paper 4 If a partial cut is performed the backlash absorption steps 40 step reverse rotation and 40 step normal rotation should...

Страница 72: ...9 6 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...

Страница 73: ...ation 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...

Страница 74: ...9 8 9 2 2 OP L1245A E External View Figure 9 8 LTP1245 Mount External View OP L1245A E Unit mm...

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