JPS6067177A - Driving power controller for thermal head - Google Patents

Driving power controller for thermal head

Info

Publication number
JPS6067177A
JPS6067177A JP17673683A JP17673683A JPS6067177A JP S6067177 A JPS6067177 A JP S6067177A JP 17673683 A JP17673683 A JP 17673683A JP 17673683 A JP17673683 A JP 17673683A JP S6067177 A JPS6067177 A JP S6067177A
Authority
JP
Japan
Prior art keywords
thermal head
temperature
thermal
driving power
printing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP17673683A
Other languages
Japanese (ja)
Inventor
Yoshinobu Nishimura
義信 西村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Teraoka Seiko Co Ltd
Original Assignee
Teraoka Seiko Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Teraoka Seiko Co Ltd filed Critical Teraoka Seiko Co Ltd
Priority to JP17673683A priority Critical patent/JPS6067177A/en
Publication of JPS6067177A publication Critical patent/JPS6067177A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/315Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/375Protection arrangements against overheating

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To contrive to prolong the useful life of a thermal head and prevent defective printing from occurring, by a method wherein the temperature in the vicinity of a thermal recording paper is detected, and driving power for a thermal head preheated to a predetermined temperature is controlled. CONSTITUTION:The thermal head 1 is preheated to a predetermined temperature by a preheater 3 operated in response to a temperature detected by a thermistor 4. When the temperature in the vicinity of the thermal recording paper (a) is detected by a thermistor 5 in accordance with the start of printing, the driving power for the thermal head 1 is controlled through a CPU or the like. Accordingly, variation in the driving power for the head is reduced, it is contrived to prolong the useful life of the head, printing is conducted while securely following up to the variations in the temperature, and defective printing is prevented from occurring.

Description

【発明の詳細な説明】 本発明はサーマルヘッドの駆動電力制御回路の改良に関
する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a drive power control circuit for a thermal head.

感熱紙を印字するサーマルヘッドにおいてサーマルヘッ
ドを駆動する電力が一定であると、環境温度の変化又は
連続印字によるサーマルヘッド自体の蓄熱によって、印
字のかすれやにじみを生じる。
In a thermal head that prints on thermal paper, if the electric power used to drive the thermal head is constant, the printing will become blurred or blurred due to changes in environmental temperature or heat accumulation in the thermal head itself due to continuous printing.

上記不具合を解消する為にサーマルヘッド自体の温度を
検出するセンサーを設け、該検出温度が高い時は低く、
低い時は高い駆動電力に制御する装置がある。
In order to solve the above problem, a sensor is installed to detect the temperature of the thermal head itself, and when the detected temperature is high, it is low.
There is a device that controls the drive power to be high when it is low.

上記従来装置において環境温度が低いと感熱紙自体の温
度が低いので、印字の為サーマルへ・7ドと感熱紙とが
接触すると、感熱紙によりサーマルヘッドが著しく冷却
される。従って印字の度に駆動電力が著しく増大するよ
うになり、駆動電力の可変量が大きくなるので、サーマ
ルヘッドの寿命が著しく短くなる。
In the above-mentioned conventional apparatus, when the environmental temperature is low, the temperature of the thermal paper itself is low, so when the thermal head comes into contact with the thermal paper for printing, the thermal head is significantly cooled by the thermal paper. Therefore, the driving power increases significantly each time printing is performed, and the variable amount of the driving power increases, resulting in a significantly shortened life span of the thermal head.

又、号−マルヘッドにサーマルへ・ノドを予熱するプリ
ヒーターを設けたものがあるが、プリヒーターは時定数
が短く温度変化に追従出来ず、感熱紙自体の温度により
印字のかすれやにじみを生じる。
In addition, there are some types of multi-heads equipped with a preheater to preheat the thermal and gutter, but the preheater has a short time constant and cannot follow temperature changes, resulting in blurred or blurred print depending on the temperature of the thermal paper itself. .

本発明は上記従来事情に鑑みてなされたものでその目的
とする処は、サーマルヘッドの駆動電力の可変量が小さ
くてサーマルヘッドの寿命が長いと共に、温度変化に確
実に追従し印字不良の無い駆動電力制御装置を提供する
ことにある。
The present invention has been made in view of the above-mentioned conventional circumstances, and its purpose is to have a long lifespan of the thermal head due to a small amount of variable drive power for the thermal head, and to ensure that temperature changes are followed without any printing defects. An object of the present invention is to provide a drive power control device.

斯る本発明のサーマルヘッドの駆動電力制御装置は、サ
ーマルヘッドにサーマルヘッドを所定温度に予熱する予
熱回路を設けると共に、感熱紙をサーマルヘッドへと導
く移送路周辺に、感熱紙又は感熱紙周辺の温度を検出す
るセンサーを設け、該センサーの検出温度に基づいてサ
ーマルヘッドの駆動電力を制御する手段を設けたことを
特徴とする。
The driving power control device for a thermal head of the present invention is provided with a preheating circuit for preheating the thermal head to a predetermined temperature in the thermal head, and also provides a heating circuit for heating the thermal head to a predetermined temperature. The present invention is characterized in that a sensor is provided for detecting the temperature of the thermal head, and means is provided for controlling the driving power of the thermal head based on the temperature detected by the sensor.

本発明を計量器付ラベルプリンタに実施した場合の一例
を図面により説明すれば、図中(1)はサーマルヘッド
であり、該サーマルヘッド(1)の取り付は構造は第1
図に示す如〈従来周知のもので、アルミ放熱板(18)
上にセラミック基板(19)を設け、該基板(19)上
にサーマルヘッド(1)を設けると共に、プラテンロー
ラー(20)を並設してなる。
An example of the case where the present invention is implemented in a label printer with a measuring device will be explained with reference to the drawings. In the drawing, (1) is a thermal head, and the structure of the installation of the thermal head (1) is the first.
As shown in the figure, it is a conventional well-known aluminum heat sink (18).
A ceramic substrate (19) is provided thereon, a thermal head (1) is provided on the substrate (19), and a platen roller (20) is arranged in parallel.

上記アルミ放熱板(1日)にはサーマルヘッド(1)の
温度を検出するサーミスタ(4)を埋設すると共に、ア
ルミ放熱板(18)にはプリヒーター(3)を設けてサ
ーマルヘッド(1)を予熱するようにする。
A thermistor (4) for detecting the temperature of the thermal head (1) is embedded in the aluminum heat sink (1), and a pre-heater (3) is installed in the aluminum heat sink (18) to connect the thermal head (1). Make sure to preheat it.

図中(A)は感熱紙ロールであり、感熱紙(a)を繰り
出して前記サーマルヘッド(1)とプラテンローラー(
20)との間に移送して印字するものである。
In the figure, (A) is a thermal paper roll, and the thermal paper (a) is fed out and connected to the thermal head (1) and the platen roller (
20) for printing.

上記感熱紙(a)の移送路周辺にはサーミスタ(5)を
設けて、感熱紙(a)自体の温度を検出するようにする
A thermistor (5) is provided around the transfer path of the thermal paper (a) to detect the temperature of the thermal paper (a) itself.

上記実施例の構成を第2図〜第3図のブロック図により
説明すれば、先ずAC電源を安定化電源部(10)とヒ
ーター制御回路(2)に接続する。
The configuration of the above embodiment will be explained with reference to the block diagrams of FIGS. 2 and 3. First, an AC power source is connected to the stabilized power source section (10) and the heater control circuit (2).

安定化電源部(10)はAC電源を電圧降下したり整流
したりしてサーマルヘッド(1)を駆動する基準電圧(
VTH)の直流を得るもので、サーマルヘッド(1)及
びサーマルヘッド制御回路(2)に接続する。
The stabilized power supply unit (10) voltage-drops or rectifies the AC power supply to generate a reference voltage (10) that drives the thermal head (1).
VTH) and is connected to the thermal head (1) and thermal head control circuit (2).

ヒーター制御回路(15)はプリヒーター(3)に流れ
る電力を制御するもので、サーミスタ(4)の検出温度
に基づいて電力を増減する。
The heater control circuit (15) controls the power flowing to the preheater (3), and increases or decreases the power based on the temperature detected by the thermistor (4).

サーミスタ(4)及び(5)は温度によって抵抗値の変
化する変換素子で温度に対応した電圧値を有する検出信
号を発生する。
The thermistors (4) and (5) are conversion elements whose resistance value changes depending on the temperature, and generate a detection signal having a voltage value corresponding to the temperature.

該サーミスタ(4)及び(5)の検出信号は該信号をデ
ジタル信号に変換するA/D変換器(7)を経てI10
ボート(8)に入力される。
The detection signals of the thermistors (4) and (5) are sent to I10 via an A/D converter (7) that converts the signals into digital signals.
input to the boat (8).

I10ボート(8)は従来周知の入出力制御装置であり
、該I10ボート(8)、データシフトアウト回路(9
)、タイマー回路(11)、I10ボート(12) 、
RAM (13)及びROM(14)を中央処理装置(
以下CPUとする)(6)に接続する。
The I10 boat (8) is a conventionally well-known input/output control device, and the I10 boat (8) and the data shift out circuit (9)
), timer circuit (11), I10 boat (12),
RAM (13) and ROM (14) are connected to the central processing unit (
(hereinafter referred to as CPU) (6).

I10ボート(8)はインターフェイス制御を行うもの
でA/D変換器(7)からのデジタル信号をCPU (
6)へと入力させると共に、該CPU (6)の出力を
ヒーター制御回路(15)及びサーマルヘッド制御回路
(2)へと入力させるものである。
The I10 board (8) performs interface control and transfers the digital signal from the A/D converter (7) to the CPU (
6), and the output of the CPU (6) is also input to the heater control circuit (15) and the thermal head control circuit (2).

データシフト回路(9)は従来周知の構成であり、CP
U (6)で処理された印字情報を順次サーマルヘッド
制御回路(2)へと伝えるのである。
The data shift circuit (9) has a conventionally well-known configuration, and the CP
The print information processed in U (6) is sequentially transmitted to the thermal head control circuit (2).

タイマー回路(11)はサーマルヘッドを起動する電力
のパルス通電時間を設定するものである。
The timer circuit (11) is used to set the pulse application time of the electric power to start the thermal head.

I10ボート(12)は従来周知の入出力制御装置であ
り、秤(16)の計量信号をA/D変換回路(17)で
デジタル信号した後、CPU (6)へと入力させるも
のである。
The I10 boat (12) is a conventionally well-known input/output control device, which converts the weighing signal from the scale (16) into a digital signal using an A/D conversion circuit (17), and then inputs the digital signal to the CPU (6).

RAM(13)及びROM(14)は夫々従来周知のメ
モリーであり、RAM (13)は印字情報等を、RO
M(14)はCPU (6)のプログラム等を記憶する
ものである。特にRAM(13)には感熱紙のサーミス
タ(5)の検出温度に適したパルス通電時間を予め記憶
させておく。
RAM (13) and ROM (14) are conventionally well-known memories, and RAM (13) stores print information, etc.
M (14) stores programs and the like for the CPU (6). In particular, the pulse energization time suitable for the temperature detected by the thermistor (5) of the thermal paper is stored in advance in the RAM (13).

尚、この場合サーミスタ(5)の検出温度とそれに対応
する最適なパルス通電時間との間に一定の関数関係があ
る場合には、その関係式をプログラムしておいてCPU
 (6)により演算してめるように構成してもよい。
In this case, if there is a certain functional relationship between the temperature detected by the thermistor (5) and the corresponding optimal pulse energization time, that relational expression can be programmed and the CPU
(6) may be calculated.

CPU (6)は予めROM (14) ニ設定記憶さ
れたプログラムの手順に従って、秤(16)からの計量
信号より重量、値段等の印字情報を処理してデータシフ
トアウト回路(9)へ入力すると共に、プリヒーターの
サーミスタ(4)の検出温度に基づいてヒーター制御回
路(15)を制御し、また感熱紙のサーミスタ(5)の
検出温度に適したパルス通電時間をタイマー回路(11
)に設定するものである。
The CPU (6) processes printed information such as weight and price from the weighing signal from the scale (16) according to the procedure of the program stored in advance in the ROM (14) and inputs it to the data shift out circuit (9). At the same time, the heater control circuit (15) is controlled based on the temperature detected by the thermistor (4) of the preheater, and the timer circuit (11) controls the pulse energization time suitable for the temperature detected by the thermistor (5) of the thermal paper.
).

次に第3図によりサーマルヘッド(1)及びサーマルヘ
ッド制御回路(2)を説明すれば、サーマルヘッド(1
)は複数の発熱体(1a)を安定化電源部(10)に並
列に接続してなる。
Next, the thermal head (1) and the thermal head control circuit (2) will be explained with reference to FIG.
) is formed by connecting a plurality of heating elements (1a) in parallel to a stabilized power supply section (10).

サーマルヘッド制御回路(2)は上記各発熱体(la)
にスイッチング用のトランジスタ(2a)及びゲート素
子(2b)に接続すると共に、シフトレジスタ(2c)
に各ゲート素子(2b)を接続してなる。
The thermal head control circuit (2) connects each of the heating elements (la)
is connected to a switching transistor (2a) and a gate element (2b), and a shift register (2c)
Each gate element (2b) is connected to the gate element (2b).

而して上記実施例の制御を第4図により説明する。The control of the above embodiment will now be explained with reference to FIG.

スタートすると(21) 、先ず秤(16)で計量しC
PU (6)にて重量を演算して表示装置(図示せず)
に表示する(22)。
When starting (21), first weigh with the scale (16) and
PU (6) calculates the weight and displays it on a display device (not shown)
(22).

入力操作部(図示せず)もしくは計量信号により印字氏
名を発すると(23) 、印字条件が整ったかをチェッ
クし整っていない場合は工程(22)に戻るようになる
(24)。
When the name to be printed is issued by an input operation unit (not shown) or a weighing signal (23), it is checked whether the printing conditions are set, and if the printing conditions are not set, the process returns to step (22) (24).

印字条件が整った場合はCPU (6)がサーミスタ(
5)の温度情報を読み取り(25) 、RAM(13)
より適したパルス通電時間に変換する(26)。
When the printing conditions are set, the CPU (6) turns on the thermistor (
5) Read the temperature information of (25) and RAM (13)
It is converted into a more suitable pulse energization time (26).

次に印字情報をデータシフトアウト回路(9)よりシフ
トレジスタ(2c)に転送しく27) 、タイマー回路
(11)にはRAM(13)のパルス通電時間を設定す
る。
Next, the print information is transferred from the data shift-out circuit (9) to the shift register (2c) 27), and the pulse energization time of the RAM (13) is set in the timer circuit (11).

印字をスタートと共にタイマーをスタートさせ(29)
 、タイマーが設定パルス通電時に達したら(30) 
、印字パルスをOFFにする(31)。
Start the timer when printing starts (29)
, when the timer reaches the set pulse energization time (30)
, turn off the print pulse (31).

次に感熱紙(a)を1ライン送って(32)、印字デー
タが終了したかをチェックしく33)、終了していない
時は工程(25)に至り、終了する迄繰り返えす(34
)。
Next, feed the thermal paper (a) one line (32) and check whether the printing data is finished (33). If it is not finished, go to step (25) and repeat until it is finished (34).
).

尚、上記実施例では印字情報は秤(16)としたが、秤
に限らず何でもよい。
In the above embodiment, the printed information is the scale (16), but it is not limited to the scale, but any other information may be used.

又、電力の制御をパルス通電時間にて設定したが、通電
時間を一定にしてサーマルヘッド(1)の駆動電圧(V
TI−1)を変化させるようにしてもよい。
In addition, although the power control was set using the pulse energization time, the drive voltage (V
TI-1) may be changed.

駆動電圧(VTI−1)を変化させてヘッド(1)の駆
動電力制御を行なう場合には、前記安定化電源部(10
)の後段に電圧制御回路を設定し、サーミスタ(5)か
らの検出信号に応じて駆動電圧(V−n−1)の電圧を
変化させればよい。
When controlling the drive power of the head (1) by changing the drive voltage (VTI-1), the stabilized power supply unit (10
) A voltage control circuit may be set after the thermistor (5), and the voltage of the drive voltage (V-n-1) may be changed in accordance with the detection signal from the thermistor (5).

尚、上記実施例のサーミスタ(4)によるヒーター制御
回路(15)の制御方法は従来周知の方法、例えばヘッ
ド(1)の温度が一定温度以上になった場合にプリヒー
ター(3)の電源をOFFにし、一定温度以下になった
場合にONにする等の方法、又は予熱回路のプリヒータ
ー(3)を所定温度以上になると抵抗が急激に増大して
一定温度を保つような半導体で形成しサーマルヘッド用
のサーミスタを不要にすることも可能である。
The method of controlling the heater control circuit (15) using the thermistor (4) in the above embodiment is a conventionally known method, for example, by turning off the power to the preheater (3) when the temperature of the head (1) exceeds a certain temperature. You can turn it off and then turn it on when the temperature drops below a certain level, or you can make the preheater (3) of the preheating circuit with a semiconductor whose resistance increases rapidly when the temperature rises above a certain level to maintain a constant temperature. It is also possible to eliminate the need for a thermistor for the thermal head.

本発明は以上のように、サーマルヘッドにサーマルヘッ
ドを所定温度に予熱する予熱回路を設けると共に、感熱
紙をサーマルヘッドへと導く移送路周辺に、感熱紙又は
感熱紙周辺の温度を検出するセンサーを設け、該センサ
ーの検出温度に基づいてサーマルヘットの駆動電力を制
御する手段を設けてなるサーマルヘッドの駆動電力制御
装置に構成したので、サーマルヘッドは如何なる外的条
件の変化においても印字最適温度に保たれる。
As described above, the present invention provides a thermal head with a preheating circuit that preheats the thermal head to a predetermined temperature, and a sensor that detects the thermal paper or the temperature around the thermal paper around the transfer path that leads the thermal paper to the thermal head. The thermal head drive power control device is configured by providing a means for controlling the drive power of the thermal head based on the temperature detected by the sensor, so that the thermal head maintains the optimum printing temperature no matter how external conditions change. is maintained.

従って、印字のにじみやかすれが皆無となる。Therefore, there is no bleeding or blurring of the print.

更に駆動電力の可変量は感熱紙又は感熱紙周辺の温度変
化分となり、微小であるので耐久性をよくすることがで
きる。
Furthermore, the variable amount of driving power corresponds to the temperature change of the thermal paper or the surroundings of the thermal paper, and is minute, so durability can be improved.

依って所期の目的を達する。Thus, the desired goal is achieved.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明実施例の配置を示す原理図、第2図は同
ブロック図、第3図は第2図の要部を示すブロック図、
第4図は同動作を示すフローチャート図である。 図中 (1)・・・サーマルヘッド (2)・・・サーマルヘッド制御回路 (3)・・・プリヒータ (4) (5)・・・サーミスタ (6)・・・中央処理装置 (a)・・・感熱紙である
。 特許出願人 株式会社寺岡精工 第2図 第4 図
FIG. 1 is a principle diagram showing the arrangement of an embodiment of the present invention, FIG. 2 is a block diagram thereof, and FIG. 3 is a block diagram showing main parts of FIG. 2.
FIG. 4 is a flowchart showing the same operation. In the figure (1)...Thermal head (2)...Thermal head control circuit (3)...Preheater (4) (5)...Thermistor (6)...Central processing unit (a)... ...It's thermal paper. Patent applicant Teraoka Seiko Co., Ltd. Figure 2 Figure 4

Claims (1)

【特許請求の範囲】[Claims] サーマルヘッドにサーマルヘッドを所定温度に予熱する
予熱回路を設けると共に、感熱紙をサーマルヘッドへと
導く移送路周辺に、感熱紙又は感熱紙周辺の温度を検出
するセンサーを設け、該センサーの検出温度に基づいて
サーマルヘッドの駆動電力を制御する手段を設けてなる
サーマルヘッドの駆動電力制御装置。
The thermal head is provided with a preheating circuit that preheats the thermal head to a predetermined temperature, and a sensor that detects the temperature of the thermal paper or the surroundings of the thermal paper is provided around the transfer path that leads the thermal paper to the thermal head, and the temperature detected by the sensor is provided. A thermal head drive power control device comprising means for controlling drive power of a thermal head based on.
JP17673683A 1983-09-22 1983-09-22 Driving power controller for thermal head Pending JPS6067177A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17673683A JPS6067177A (en) 1983-09-22 1983-09-22 Driving power controller for thermal head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17673683A JPS6067177A (en) 1983-09-22 1983-09-22 Driving power controller for thermal head

Publications (1)

Publication Number Publication Date
JPS6067177A true JPS6067177A (en) 1985-04-17

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JP17673683A Pending JPS6067177A (en) 1983-09-22 1983-09-22 Driving power controller for thermal head

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63178148U (en) * 1987-03-04 1988-11-17
JPH0342651U (en) * 1989-09-01 1991-04-23
JPH03128257A (en) * 1989-10-14 1991-05-31 Nippon Signal Co Ltd:The Printing device of device for dealing with cards
JPH04161350A (en) * 1990-10-26 1992-06-04 Matsushita Electric Ind Co Ltd Heat-sensitive recording device
JPH04197754A (en) * 1990-11-29 1992-07-17 Fuji Xerox Co Ltd Temperature controller of ink jet recorder
JPH0542709A (en) * 1991-08-19 1993-02-23 Sanyo Electric Co Ltd Printing device for card processor
US5529408A (en) * 1986-11-26 1996-06-25 Canon Kabushiki Kaisha Thermal transfer recording method including preheating thermal transfer recording medium

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5638278A (en) * 1979-09-06 1981-04-13 Toshiba Corp Thermal transfer printing system
JPS58153676A (en) * 1982-03-05 1983-09-12 Canon Inc Thermal transfer printing device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5638278A (en) * 1979-09-06 1981-04-13 Toshiba Corp Thermal transfer printing system
JPS58153676A (en) * 1982-03-05 1983-09-12 Canon Inc Thermal transfer printing device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5529408A (en) * 1986-11-26 1996-06-25 Canon Kabushiki Kaisha Thermal transfer recording method including preheating thermal transfer recording medium
JPS63178148U (en) * 1987-03-04 1988-11-17
JPH0342651U (en) * 1989-09-01 1991-04-23
JPH03128257A (en) * 1989-10-14 1991-05-31 Nippon Signal Co Ltd:The Printing device of device for dealing with cards
JPH04161350A (en) * 1990-10-26 1992-06-04 Matsushita Electric Ind Co Ltd Heat-sensitive recording device
JPH04197754A (en) * 1990-11-29 1992-07-17 Fuji Xerox Co Ltd Temperature controller of ink jet recorder
JPH0542709A (en) * 1991-08-19 1993-02-23 Sanyo Electric Co Ltd Printing device for card processor

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