MTP SERIES THERMAL PRINTER MECHANISM TECHNICAL REFERENCE U00084438003
MTP SERIES THERMAL PRINTER MECHANISM TECHNICAL REFERENCE Document Number U00084438003 First Edition Second Edition Third Edition Fourth Edition January 1995 September 2003 December 2005 April 2011 Copyright © 1995, 2003, 2005, 2011 by Seiko Instruments Inc. All rights reserved. Seiko Instruments Inc. (hereinafter referred to as “SII”) has prepared this technical reference for use by SII personnel, licensees, and customers.
PREFACE This reference manual describes the specifications and basic operating procedures for the MTP Series Thermal Printer Mechanisms. Read it thoroughly so that you are able to use the MTP Series Thermal Printer Mechanisms properly. The MTP (RoHS supporting) series has the following eight types of printers.
TABLE OF CONTENTS Section Page CHAPTER 1 FEATURES CHAPTER 2 SPECIFICATIONS 2.1 PART NUMBER................................................................................................................2-1 2.2 GENERAL SPECIFICATIONS..........................................................................................2-2 2.2.1 Character Printers .................................................................................................2-2 2.2.2 Graphic Printers ...............................
Section Page CHAPTER 4 TIMING CHART 4.1 TIMING CHART ................................................................................................................4-1 4.2 DETAILED CHART OF PRINTING START TIMING ........................................................4-3 4.3 CONTINUOUS PRINTING OPERATION .........................................................................4-3 4.3.1 Home Switch Signal Method .................................................................................4-3 4.3.
Section Page 8.4 THERMAL PAPER TAKE-UP DEVICE ............................................................................8-6 8.5 FLEXIBLE CABLE ............................................................................................................8-7 8.5.1 Connecting and Fixing the Flexible Cable Terminal .............................................8-7 8.5.2 Bend Radius of Flexible Cable..............................................................................8-7 8.
Figure 3-1 3-2 3-3 Page 3-4 3-5 Thermal Head Control Pin Assignment (B Head-mounted Printer)..................................3-1 Motor and Switch Control Terminal Assignment (B Head-mounted Printer, MTP102) ....3-2 Motor and Switch Control Terminal Assignment (B Head-mounted Printer, MTP201 and MTP401) ...........................................................3-2 Thermal Head Control Terminal Assignment (G Head-mounted Printer) ........................
CHAPTER 1 FEATURES The MTP Series Line Thermal Printer Mechanism is a series of compact, thermal printers designed to meet the demand for small, low cost units. It can be used in adding machines, measuring instruments and analyzers, office machines, medical apparatus, and data terminal devices.
CHAPTER 2 SPECIFICATIONS 2.1 PART NUMBER (1) Character printers - MTP (1) (2) (3) (1): Base model code (2): Characters per line* (3): Print head type used * Maximum number of characters per line based on character matrix in General specifications.
2.2 GENERAL SPECIFICATIONS 2.2.1 Character Printers Table 2-1 Character Printer Specifications Item Specifications Base model code Model MTP102 MTP102-13B MTP201 MTP102-16B MTP201-20B MTP401 MTP201-24B Printing method Thermal serial dot printing Printing direction Left to right with respect to the direction the paper is fed. Dots per line (H×W / line) Paper feed pitch (H×W) 7 dots × 89 dots 7 dots × 110 dots 7 dots × 138 dots 7 dots × 166 dots 7 dots × 278 dots 0.35mm × 0.30mm 0.
Table 2-1 Character Printer specifications Item Specifications Base model code Current consumption (room temperature, 5.0V) (continued) MTP102 MTP201 During MTP401 3.2A max. printing During paper 250mA max. feed Operating temperature 0 to 50°C range Storage temperature −40 to 60°C range Life span 5 hundred thousand lines (5.0V rated energy, room temperature, “8” full line printing)Note1 Failure rate 10-6 / line or less (5.
2.2.2 Graphic Printers Table 2-2 Graphic Printer Specifications Item Specifications Base model code Model MTP201 MTP201-G128 MTP401 MTP201-G166 MTP401-G280 Printing method Thermal serial dot printing Printing direction Left to right with respet to the direction the paper is fed. Dots per line (H×W / line) Paper feed pitch (H×W) 8 dots × 128 dots 0.35mm × 0.35mm 0.35mm × 0.28mm Character matrix (H×W) Character per line Printing width Printing speed (room temperature, 5.
Table 2-2 Graphic Printer Specifications Item Specifications Base model code Current consumption (room temperature, 5.0V) (continued) MTP201 MTP401 during 3.2A max. printing during paper 250mA max feed 0 to 50ºC Operating temperature range −40 to 60ºC Storage temperature range Life span 5 hundred thousand lines (5.0V rated energy, room temperature, “8” full line printing) Note1 Failure rate 10-6 / line or less (5.
2.3 MOTOR DRIVER CHARACTERISTICS The motor is the power source for head movement and paper feed. Through the application of DC voltage to the motor, the head automatically moves back and forth, and paper fed on its return; therefore, there is no need to reverse the motor. (1) Motor terminal voltage (2) Motor power consumption During printing During paper feeding Commencing movement Ceasing movement 5.0 ± 1.0 V DC 170 mA max. (room temperature, room humidity, 5.0 V DC) 250 mA max.
(3) Motor stop signal Stop the motor drive signal within 1 ms after detecting a home switch “OFF” (100 to 250 μs) signal, and input a motor stop signal of at least 25 ms. 100-250μs ON Home switch signal OFF Motor drive signal 1 ms max. Motor stop signal 25 ms min. * See Section 2.5, Home Switch, for home switch signal. Figure 2-2 Motor Drive Signal Timing M+ Vcc 270Ω + M 2SD1699 M- IN 2SD999 DTC123E 22kΩ * When using this circuit, a motor stop signal is not required.
2.4 TG (TACHO-GENERATOR) OUTPUT CHARACTERISTICS The TG is a signal generator directly connected to the motor, that generates false sine waves of two cycles per 1 turn of the motor. These waves are converted by a waveform shaping circuit into rectangular wave signals, which are used as a pulse impression timing signal for the thermal head. (1) TG output Table 2-3 TG Output 4 to 6V 5V Output voltate (Vp-p) 2.0 to 7.0 3.5 to 6.0 Period (ms) 2.5 to 6.5 3.0 to 5.
2.5 HOME SWITCH The home switch is a push-open type mechanical switch, which switches “OFF” when the head is at the home position (left end). The switch has two functions. The first is to detect the home position when the head stops there. Upon returning to the home position, the home switch switches from “ON” to “OFF”, and brakes are applied to stop the motion of the print head. The second function is it is used as reference point for starting the counting of the print timing signals.
2.6 THERMAL PRINT HEAD Because the thermal print head in the MTP Series is a thin film type with high thermal efficiency, it has an excellent print quality. The CPU determines which vertically placed heating units to energize, and drives them with the thermal head driver (transistor). 2.6.1 Head Specifications Type of Head Heating unit size B head Dot 1 Dot 2 G Head Dot 1 0.3 Dot 2 0.05 Dot 3 0.3 0.05 Dot 3 Dot 4 2.4 Dot 4 2.75 Dot 5 Dot 5 Dot 6 Dot 6 Dot 7 Dot 7 0.26 Dot 8 0.
Vcc Head drive signal 1 2.2kΩ 2SC5585 H-COM Dot 1 10kΩ Head drive signal 2 2.2kΩ 2SC5585 ・ ・ ・ Head drive signal 8 Dot 2 ・ ・ ・ 10kΩ ・ ・ ・ ・ ・ ・ 2.2kΩ 2SC5585 Dot 8 10kΩ Figure 2-8 Sample Thermal Head Drive Circuit 2.6.2 Head Applied Energy Correction Use the Applied Energy Correction Formula below to correct for when the power voltage and ambient temperature fluctuation during operation (see sample pulse width control circuit).
2.6.3 Head Activation Pulse Width To ensure high quality printing with the MTP Series, the thermal head activation pulse width must be set according to the head drive voltage and the head resistance. Pulse width calculation formula R•E t= 2 V t: Pulse width for applying rated energy (ms) R: Head resistance (Ω) B head G head A rank 15.3Ω 17.6Ω B rank 14.0Ω 16.0Ω C rank 12.7Ω 14.
2.6.4 Control of Printing Pulse Width Superior print quality can be maintained by controlling the print pulse width by the print pulse width control circuit. This is an oscillating circuit in which the frequency varies depending upon the voltage and ambient temperature, and provides a specified pulse width by counting a certain number of pulses with the CPU. The leading edge of the pulse is synchronized with the timing signal.
Oscillator output 4069UB 820p 100kΩ 150kΩ VR 50kΩ 22kΩ 22kΩ 2SC 1740 1SS133 22kΩ Print pulse width 1 2 34 5 1819 20 Oscillator output Head drive signal (Example: 20-pulse count) * The compensation circuits for temperature and voltage are included. * Adjust an oscillating frequency with VR to obtain the proper pulse width in 20 counts at the normal temperature. * A print pulse width is made by counting the above oscillator output with the CPU.
CHAPTER 3 TERMINAL ASSIGNMENT 3.1 3.1.
3.1.
3.2 3.2.
CHAPTER 4 TIMING CHART 4.1 TIMING CHART Figure 4-1 shows the timing chart when using a B-head mounted printer. The number of the head drive signal depends on the type of thermal head mounted on the printer.
* Signal in are issued from the circuit side.
4.2 DETAILED CHART OF PRINTING START TIMING Home switch signal TG signal Timing signal Head drive signal * Start printing from the second pulse of timing signals. Figure 4-2 Printing Start Timing Chart 4.3 CONTINUOUS PRINTING OPERATION 4.3.1 Home Switch Signal Method The print start position is determined for each line on the basis of the ON-rise of the home switch signal.
4.3.2 Timing Signal Count Method When printing a graphic image, print a picture unit by the following method. The print start position deviation may not occur. 1. Determine the print start position of the first line by the ON-rise of the home switch signal (same as the home switch signal method). 2. For the second and the subsequent lines, determine the print start position by counting timing signals (do not stop the head at its home position).
N is as shown below: Part Number N Part Number N MTP102 -13B 160 MTP201 -G128 276 -16B 200 MTP201 -20B 230 -24B 276 MTP401 -40B 450 - 4-5 -G166 276 MTP401 -G280 450
CHAPTER 5 APPEARANCE AND DIMENSIONS Figures 5-1 to 5-5 shows the appearance and external dimensions of the MTP Series printer mechanisms.
5-2 Figure 5-1 MTP102 (B head-mounted) Appearance and External Dimensions Printing position Tolerance: ±0.
5-3 Figure 5-2 MTP201 (B head-mounted) Appearance and External Dimensions
5-4 Printing position Figure 5-3 MTP401 (B head-mounted) Appearance and External Dimensions Paper inlet (Unit: mm) Tolerance: ±0.
5-5 Printing position Figure 5-4 MTP201 (G head-mounted) Appearance and External Dimensions Paper inlet Tolerance: ±0.
5-6 Printing position Figure 5-5 MTP401 (G head-mounted) Appearance and External Dimensions Paper inlet Tolerance: ±0.
CHAPTER 6 SAMPLE CIRCUIT BLOCK DIAGRAM Figures 6-1 and 6-2 shows the samples of the circuit block diagrams.
6-2 + 5V power D0 to D7 8-bit parallel data Digit setting jumper terminal TG waveform shaping circuit Motor drive circuit Home switch & tacho-generator in common (GND) Tacho-generator signal Home switch signal Motor (+) Motor drive output (−) Thermal head drive (7 wires) Figure 6-1 Sample Circuit Block Diagram (B Head-mounted Printer) Printing pulse width control circuit Motor control signal Print data Thermal head drive circuit 8-input (Transistors) transistor array Thermal head common
6-3 + 5V power D0 to D7 8-bit parallel data Digit setting jumper terminal Home switch, tacho-generator in common (GND) Tacho-generator signal Home switch signal Motor (+) Motor drive output (−) Thermal head drive (8 wires) Figure 6-2 Sample Circuit Block Diagram (G Head-mounted Printer) TG waveform shaping circuit Motor drive circuit Printing pulse width control circuit Motor control signal Print data Thermal head drive circuit 8-input (Transistors) transistor array Thermal head common
CHAPTER 7 DESIGNING AND HANDLING PRECAUTIONS To maintain the performance of the MTP Series and to prevent future problems from occurring, observe the following precautions. 7.1 DESIGN PRECAUTIONS (1) Do not apply an energy source that is too high. If too much energy is applied to the thermal head, it may overheat and become damaged. Always use the printer with the specified pulse width.
(2) Stop the thermal head at the home position; otherwise, the platen may become deformed resulting in poor print quality. (3) Do not print without paper; otherwise, the platen or thermal head may become damaged. (4) Do not damage the platen by removing paper when a paper jam occurs. (5) Cut the edge of the paper so that the corners of the paper are square (90°); otherwise, a paper jam may occur. (6) Unload paper in the direction in which the paper is normally fed.
CHAPTER 8 DESIGN OF PERIPHERAL DEVICES 8.1 DESIGN PRECAUTIONS The mounting procedure for MTP Series printers differs somewhat between the MTP102 and the other printers in the series. Mount the printer so that it is not warped or distorted in any way. 8.1.1 MTP102 Printer The MTP102 is provided on its back two dowels and two holes diagonally for mounting the printer (see Figure 8-1).
(2) When mounting without screws Using the dowels and the φ2 mm holes on the back of the printer as reference for positioning, fix the printer by pressing the eaves on both sides of the upper portion of the printer (see Figure 8-3). Do not push on the eaves at the motor end. Motor Figure 8-3 Mounting without Screws (MTP102 printer) 8.1.2 MTP201 and 401 Printers The MTP201 and 401 printers are provided with φ2.2 mm mounting holes at the two corners of the printer (see Figure 8-4).
(1) When mounting with screws With the φ2.2 mm holes at the corners of the printer as a reference for positioning, fix the printer on the printer base by tightening the tapping screws from the top of the printer (see Figure 8-5). Tapping screw φ2 mm Printer mounting base Figure 8-5 Mounting with Screws (MTP201 and 401 Printer) (2) When mounting without screws With the φ2.2 mm holes as a reference for positioning, fix the printer by pressing the eaves on both sides of the upper portion of the printer.
8.2 MOUNTING THE PAPER CUTTER 1mm min. Design the paper cutter so that the cutter tip is located over the paper outlet so that it does not interrupt the paper flow (see Figure 8-7). Design any peripheral devices so that the paper does not re-enter the printer.
8.3 MOUNTING A ROLL HOLDER FOR HEAD SENSITIVE PAPER Design the roll specifications: Heat sensitive paper roll Printer holder to the following Paper inlet 1) No sideways deviation between holder and inlet. 2) Less than 2 mm between holder and the sides of the roll. 3) The holder does not touch the sides of the roll. 4) The horizontal axis of the roll in the holder is parallel with the inlet(see Figure 8-8).
8.4 THERMAL PAPER TAKE-UP DEVICE Take into consideration the following items when designing the thermal paper take-up device. 1) After printing, the paper must be taken up without being pulled taut. 2) Even when paper guides have attached as shown below, if the thermal paper is pulled taut, correct contact between the thermal head and the thermal paper can not be obtained and printing will be adversely affected.
8.5 8.5.1 FLEXIBLE CABLE Connecting and Fixing the Flexible Cable Terminal Use and FPC (Flexible Printed Circuit) connector to connect and fix the flexible cable terminal. Refer to the external view of each printer for the mounting position of the FPC connector. 8.5.2 Bend Radius of Flexible Cable Design the case of peripheral device to provide for a minimum radius of at least 5R (mm) at the point where the flexible cable bends. Flexible cable 5R min.
8.6 REPLACEMENT OF HEAD UNIT The model which can replace the head unit is the printer of MTP 401 series. 8.6.1 Removing Head Unit (1) Move the head carrier to position A by turning the motor gear by hand to allow easy replacement of the head unit (see figure 8-11). Motor gear Motor Head unit Approx. 2 cm A Head carrier frame Figure 8-11 Moving the Head Carrier Flexible lead wire support plate (2) Remove the flexible lead wire from the cable support of the flexible cable plate.
(3) Pull out the flexible cable plate in the direction shown by arrow A holding the edge of the plate with a finger, then disengage the plate from the dowel of the head carrier (see figure 8-13). Flexible lead wire support plate Dowel A Head carrier frame Figure 8-13 Pulling out the Flexible Cable Plate (4) Holding both sides of the head unit with your fingers, pull out the head unit in the direction shown by arrow B (see Figure 8-14).
8.6.2 Mounting the Head Unit Head unit terminal (1) Move the head carrier to a position that permits easy replacement (see Figure 8-15). (2) Insert the head unit terminal between the platen and the guide pin and head feeding screw with the soldered surface of the head unit terminal upwards (see Figure 8-15). Holding the solder-plated face upward, insert the head unit terminal so that it passes in front of the platen and under the guide pin and the head feed screw.
(4) Slide the head unit terminal cable into the slit provided on the head carrier. Next, slide the head along the guide of the head carrier until it touches the guide (see Figure 8-17). C Head Guide Head carrier frame Figure 8-17 Sliding the Head along the Guide of the Head Carrier (5) Latch the flexible cable plate to the claws of the head and push it down until engages with the dowel on the head carrier.
