JPS5952673A - Protecting system for heat sensitive recording head - Google Patents

Protecting system for heat sensitive recording head

Info

Publication number
JPS5952673A
JPS5952673A JP57161585A JP16158582A JPS5952673A JP S5952673 A JPS5952673 A JP S5952673A JP 57161585 A JP57161585 A JP 57161585A JP 16158582 A JP16158582 A JP 16158582A JP S5952673 A JPS5952673 A JP S5952673A
Authority
JP
Japan
Prior art keywords
recording head
sensitive recording
heat
heat sensitive
fuses
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.)
Granted
Application number
JP57161585A
Other languages
Japanese (ja)
Other versions
JPH022711B2 (en
Inventor
Noboru Suemori
末森　登
Yoshishige Nagase
永瀬　寿重
Sadao Egami
江上　貞夫
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP57161585A priority Critical patent/JPS5952673A/en
Publication of JPS5952673A publication Critical patent/JPS5952673A/en
Publication of JPH022711B2 publication Critical patent/JPH022711B2/ja
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/315—Typewriters 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
    • B41J2/32—Typewriters 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
    • B41J2/375—Protection arrangements against overheating

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To certainly protect a heat sensitive recording head from an abnormal high temp., by attaching a temp. fuse having predetermined melt-cutting characteristics to a heat sink mounted to a heat sensitive recording head. CONSTITUTION:In a heat sensitive recording head, fuses 2, 3 each having predetermined melt-cutting characteristics are attached to a heat sink 1 mounted so as to dissipate heat generated from a heat sensitive recording element into the air in an easily replaceable manner. In usual, when a power source switch 4 is closed, a relay coil 8 is excited to close relay contacts 6, 7 and the AC power source from an insert plug 11 is supplied to various kinds of power source circuits but, when the temp. of the heat sensitive recording head is raised to a predetermined temp. for some reason, either one of the fuses 2, 3 attached to the heat sink is cut by melting to release the excitation of the relay coil 8 while the relay contacts 6, 7 are opened to cut off the power source to the heat sensitive recording head.

Description

【発明の詳細な説明】 本発明は、感熱記録ヘッドに具（蒲されてなるヒートシ
ンクに所定の溶断特性をもつ温度ヒユーズを取付するこ
とによって、異常高温より感熱記録ヘッドを保護するよ
うにした感熱記録ヘッド保護方式に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a thermal recording head that protects the thermal recording head from abnormally high temperatures by attaching a temperature fuse having a predetermined fusing characteristic to a heat sink that is wrapped around the thermal recording head. This relates to a recording head protection system.

一般に感熱記録ヘッドには発熱抵抗体である感熱記録素
子が複数個（例えば２０４８個）列状に配置されている
が、これによって感熱記録全行なうに際しては感熱記録
素子は記録情報に応じ選択的に発熱駆動されるようにな
っている。記録情報に応じて選択された感熱記録素子に
パルス電流を印加すれば、これによって感熱記録素子が
発熱することから、この熱によって感熱記録紙が発色し
感熱記録が行なわれるものである。ところで感熱記録ヘ
ッドはその寿命上異常高温よシ保障されなければならな
いものとなっているが、従来にあっては十分な保護対策
が採られていないのが実状である。Generally, in a thermal recording head, a plurality of (for example, 2048) thermal recording elements, which are heat-generating resistors, are arranged in a row. It is designed to be driven by heat. When a pulse current is applied to a heat-sensitive recording element selected according to recording information, the heat-sensitive recording element generates heat, and this heat causes the heat-sensitive recording paper to develop color, thereby performing thermosensitive recording. Incidentally, thermal recording heads must be protected from abnormally high temperatures due to their lifespan, but the reality is that sufficient protection measures have not been taken in the past.

従来にあっては直接間接に感熱記録ヘッドの温度を検出
し、異常高温が検出された場合には保護回路によって印
加電流値ｈｉいは印加電圧値、または印加パルス幅を制
限するといった具合に感熱記、録ヘッドが異常高温にな
ることを防止しているが、これによる保護対策は十分で
ないというものである。というのは、保護回路自体や保
護回路と感熱記録素子との間に存する駆動回路部分など
に生じた故障如何によっては感熱記録素子は連続的に発
熱駆動される場合がアシ、このような場合には異常高嚇
よシ感熱記録ヘッドを保護し得ないというわけである。Conventionally, the temperature of the thermal recording head is directly or indirectly detected, and if an abnormally high temperature is detected, a protection circuit limits the applied current value, applied voltage value, or applied pulse width. Although the recording head is prevented from becoming abnormally high temperature, this protection measure is not sufficient. This is because the thermal recording element may be continuously driven to generate heat depending on a failure that occurs in the protection circuit itself or in the drive circuit section between the protection circuit and the thermal recording element. This means that the thermal recording head cannot be protected from abnormally high threats.

よって本発明の目的は、異常高温よ！ｌｌ感熱記録ヘッ
ドを確実に保護し得る感熱記録ヘッド保膿方式を供する
にある。Therefore, the purpose of the present invention is to solve abnormally high temperatures! It is an object of the present invention to provide a heat-sensitive recording head storage method that can reliably protect a heat-sensitive recording head.

この目的のため本発明は、感熱記録ヘッドには感熱記録
素子より発生する熱ｋ　２中へ放散させるためのヒート
シンクが具備されていることに着目し、これに所定温度
で溶断するヒユーズを適当数取付し、何れかのヒユーズ
溶断を以て感熱記録ヘッドへの電源供給を少なくとも断
つようにしたものである。For this purpose, the present invention focuses on the fact that the thermal recording head is equipped with a heat sink for dissipating the heat generated by the thermal recording element into the heat k2, and an appropriate number of fuses that melt at a predetermined temperature are attached to the heat sink. At least the power supply to the thermal recording head is cut off when one of the fuses is blown.

以下、本発明を添附した図により説明する。Hereinafter, the present invention will be explained with reference to the accompanying drawings.

添附した図は本発明による保護方式に係る一例での要部
回路構成を示したものである。これによると既述のヒー
トシンク１には所定の溶断特性をもったヒユーズ２，６
がヒートシンク１からの熱を良好に受けるべく、また、
容易に取外し交換可として取付きれるようになっている
。一般にヒユーズの個数と取付位置は適当に定められる
が、その数は２，３細根度で十分である。The attached diagram shows the main circuit configuration of an example of the protection system according to the present invention. According to this, the heat sink 1 described above has fuses 2 and 6 with predetermined fusing characteristics.
In order to receive the heat from the heat sink 1 well,
It is designed to be easily removable and replaceable. Generally, the number of fuses and their mounting positions are determined appropriately, but a number of fuses of 2 or 3 fine roots is sufficient.

一方、感熱記録ヘッドを有してなる装置全体の電源は差
込プラグ１１ヲコンセントに差し込むことによって得ら
れるようになっている。差込プラグ１１からの交流電源
は電源オン・オフ制御回路５内のヒユーズ１０、リレー
接点６，７を介された後、各種電源回路（図示せず）に
供給されるようになっている。したがって、電源スィッ
チ４が開かれた場合は勿論のこと、ヒユーズ２，６の何
れか１つが少なくとも溶断した場合にもリレー接点６，
７を開くように制御すれば、所期の目的が達成されるこ
とになるものである。本例では図示の如くヒユーズ１０
ヲ介された交流電源は一方では変圧器９によって降圧さ
れたうえリレーコイル８の励磁電源として用いられるよ
うになっており、結局リレーコイル８の励磁制御ヲリレ
ーコイル８に対して直列接続された電源スィッチ４およ
びヒユーズ２゜３によって制御すればよいことになる。On the other hand, power for the entire apparatus including the thermal recording head is obtained by inserting the plug 11 into an outlet. The AC power from the plug 11 is supplied to various power circuits (not shown) after passing through a fuse 10 and relay contacts 6 and 7 in the power on/off control circuit 5. Therefore, not only when the power switch 4 is opened, but also when at least one of the fuses 2, 6 is blown, the relay contacts 6,
7, the intended purpose will be achieved. In this example, the fuse 10 is
On the other hand, the AC power that has been passed through is stepped down by a transformer 9 and is used as an excitation power source for the relay coil 8. Eventually, the excitation control of the relay coil 8 is controlled by a power switch connected in series to the relay coil 8. 4 and fuse 2.3.

通常の状態にあってはヒユーズ２，３は何れもまだ溶断
していないから、電源スィッチ４を閉じることによって
リレーコイル８が励磁され、しかしてそのリレー接点６
，７が閉じられることによって装置全体には各種の電源
が供給されることに・１）なる。しかし、このような状
態で何等かの原因によって感熱記録ヘッド、したがって
ヒートシンク１の温度が所定温度にまで上昇す才１ば、
ヒユーズ２．３の何れかが少なくとも溶断することとな
るものである。ヒユーズ２，６の何れかが溶断すれば電
源スィッチ４が閉じられていてもリレーコイル８の励磁
は解除されることになり、そのリレー接点６，７が開か
れることによって感熱記録ヘッドへの電源は瞬時に断た
れることから、感熱記録ヘッドは異常高温より確実に保
護されるところとなるわけである。これにより感熱記録
ヘッド近傍に存する記録紙などからの発煙や異常な臭い
、プラスチック部品などの熱による変形も未然に防止さ
れるところとなるものである。Under normal conditions, neither of the fuses 2 and 3 are blown yet, so closing the power switch 4 energizes the relay coil 8, and the relay contact 6
, 7 are closed, various power sources are supplied to the entire device.1). However, if the temperature of the thermal recording head and therefore the heat sink 1 rises to a predetermined temperature due to some reason in such a state,
At least one of the fuses 2.3 will blow. If either fuse 2 or 6 blows, the relay coil 8 will be de-energized even if the power switch 4 is closed, and by opening the relay contacts 6 and 7, power to the thermal recording head will be removed. Since the heat is cut off instantly, the thermal recording head is reliably protected from abnormally high temperatures. This will prevent smoke and abnormal odors from the recording paper and the like existing near the thermal recording head, as well as deformation of plastic parts and the like due to heat.

以上説明したように本発明は、感熱記録ヘッドに具備さ
れてなるヒートシンクに所定の溶断特性をもったヒユー
ズを適当数取付し、ヒユーズの何れかが溶断した場合に
はこれを以て感熱記録ヘッドへの電源供給を少なくとも
断つようにしたもめである。したがって、本発明による
場合は、簡単容易にして異常高温よシ感熱記録ヘッド金
確実に保護し得るという効果がある。As explained above, in the present invention, an appropriate number of fuses having predetermined fusing characteristics are attached to the heat sink included in the thermal recording head, and when any of the fuses blows out, the heat sink is equipped with the thermal recording head. This is a dispute that at least led to the power supply being cut off. Therefore, according to the present invention, there is an effect that the heat-sensitive recording head can be easily and easily protected from abnormally high temperatures.

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

図は、本発明による保護方式に係る一例での要部回路構
成を示す図である。 １・・・（感熱記録ヘッドに具備されている）ヒートシ
ンク、２，３・・・ヒユーズ、４・・・電源スィッチ、
５・・・電源オン・オフ制御回路、６，７・・・リレー
接点、８・・・リレーコイル、９・・・（降圧用）変圧
器。 代理人　弁理士　　秋　本　正　実The figure is a diagram showing a main circuit configuration in an example of the protection system according to the present invention. 1... Heat sink (equipped in the thermal recording head), 2, 3... Fuse, 4... Power switch,
5... Power on/off control circuit, 6, 7... Relay contact, 8... Relay coil, 9... (Step-down) transformer. Agent Patent Attorney Masami Akimoto

Claims (1)

【特許請求の範囲】[Claims] 感熱記録ヘッドに具備されているヒートシンクに所定温
度で溶断するヒユーズす適当数取付し、該ヒユーズの倒
れかの溶断を以て感熱記録ヘッドへの電源供給を少なく
とも断つようにしたことを特徴とする感熱記録ヘッド保
護方式。A heat-sensitive recording device characterized in that an appropriate number of fuses that melt at a predetermined temperature are attached to a heat sink provided in the heat-sensitive recording head, and at least the power supply to the heat-sensitive recording head is cut off when the fuses fall or blow out. Head protection method.
JP57161585A 1982-09-18 1982-09-18 Protecting system for heat sensitive recording head Granted JPS5952673A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57161585A JPS5952673A (en) 1982-09-18 1982-09-18 Protecting system for heat sensitive recording head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57161585A JPS5952673A (en) 1982-09-18 1982-09-18 Protecting system for heat sensitive recording head

Publications (2)

Publication Number Publication Date
JPS5952673A true JPS5952673A (en) 1984-03-27
JPH022711B2 JPH022711B2 (en) 1990-01-19

Family

ID=15737918

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57161585A Granted JPS5952673A (en) 1982-09-18 1982-09-18 Protecting system for heat sensitive recording head

Country Status (1)

Country Link
JP (1) JPS5952673A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6485780A (en) * 1987-09-29 1989-03-30 Toshiba Corp Thermal head protection device
JP2015054451A (en) * 2013-09-12 2015-03-23 村田機械株式会社 Image formation device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5232750U (en) * 1975-08-30 1977-03-08
JPS5769073A (en) * 1980-10-17 1982-04-27 Canon Inc Heat sensitive recorder

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5232750B2 (en) * 1973-09-04 1977-08-23

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5232750U (en) * 1975-08-30 1977-03-08
JPS5769073A (en) * 1980-10-17 1982-04-27 Canon Inc Heat sensitive recorder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6485780A (en) * 1987-09-29 1989-03-30 Toshiba Corp Thermal head protection device
JP2015054451A (en) * 2013-09-12 2015-03-23 村田機械株式会社 Image formation device

Also Published As

Publication number Publication date
JPH022711B2 (en) 1990-01-19

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