JPH05155100A - Mechanism for retaining thermal head - Google Patents

Mechanism for retaining thermal head

Info

Publication number
JPH05155100A
JPH05155100A JP3320792A JP32079291A JPH05155100A JP H05155100 A JPH05155100 A JP H05155100A JP 3320792 A JP3320792 A JP 3320792A JP 32079291 A JP32079291 A JP 32079291A JP H05155100 A JPH05155100 A JP H05155100A
Authority
JP
Japan
Prior art keywords
head
thermal head
platen
positioning
bearing
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
JP3320792A
Other languages
Japanese (ja)
Inventor
Naoki Kawada
直樹 川和田
Koji Kawaguchi
幸治 川口
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.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
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 Seiko Instruments Inc filed Critical Seiko Instruments Inc
Priority to JP3320792A priority Critical patent/JPH05155100A/en
Publication of JPH05155100A publication Critical patent/JPH05155100A/en
Pending legal-status Critical Current

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  • Electronic Switches (AREA)

Abstract

PURPOSE:To improve the parallelism, positioning precision and pressing force uniformity, etc., of the head and platen by a method wherein the thermal head is retained at a certain degree of freedom in the pressing direction and received image carrying direction, and the relative locations of the head and platen are determined using a positioning plate. CONSTITUTION:A thermal head 1 is fixed on a head attaching frame 2 by a reference hole 10, and a positioning plate 16 is attached to the head attaching frame 2 by a positioning pin 14. The head attaching frame 2 is supported by a hinge pin 3 through a receiving seat 13 which is formed of a material with lubricant property such as polyacetal, etc. A slot 6, in which the hinge pin 13 can move within a specified range in the vertical and lateral directions, is provided in the receiving seat 13. In addition, a preload is added by a pressing spring 9 in order to bring the positioning plate 16 and a bearing 15 into contact assuredly. By the above mentioned constitution, the parallelism, positioning precision and pressing force uniformity of the head and platen can be improved.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、複写機、ファクシミ
リ、ワードプロセッサ、プリンタ等の特にサーマルヘッ
ドとプラテンローラとを含む熱転写型画像出力装置にお
けるサーマルヘッドの保持機構に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal head holding mechanism for a thermal transfer type image output apparatus including a thermal head and a platen roller, such as a copying machine, a facsimile, a word processor, a printer and the like.

【0002】[0002]

【従来の技術】従来、サーマルヘッドの保持機構は図2
に示すように、サーマルヘッド1の背面に設けられてい
る基準穴10と嵌合するボス(図示せず)を持つヘッド
取付フレーム2に対し、サーマルヘッド1の発熱抵抗体
の配置ラインがプラテンローラ4の軸線に一致するよう
にU溝位置決め部7を設計する。このヘッド取付フレー
ム2には長穴部6が設けてあり、左右方向へ若干自由度
を持たせてあり、同時にヒンジピン3の回りに回動可能
であり、ヘッドのリトラクションができるようになって
いる。
2. Description of the Related Art A conventional thermal head holding mechanism is shown in FIG.
As shown in FIG. 3, the head heater frame 2 having a boss (not shown) fitted into the reference hole 10 provided on the back surface of the thermal head 1 has a platen roller on which the heating resistor arrangement line of the thermal head 1 is arranged. The U-groove positioning portion 7 is designed so as to coincide with the axis of 4. The head mounting frame 2 is provided with an elongated hole portion 6 so as to have a slight degree of freedom in the left-right direction, and at the same time, can be rotated around the hinge pin 3 so that the head can be retracted. There is.

【0003】さらに、発熱抵抗体とプラテン4との位置
を確実なものとするため、予圧ばね9により、U溝位置
決め部7の内側面11がプラテン軸8に隙間なく当接す
る機構を兼ね備えたものもある。例えば、特公昭63−
7157号公報、特公平3−35111号公報、特開平
2−295757号公報、特開平3−57674号公
報、特開平3−75175号公報、実開昭58−863
60号公報、実開昭62−175925号公報、実開昭
63−194730号公報、実開平1−30239号公
報、実開平1−175826号公報にこのような構造が
開示されている。
Further, in order to secure the positions of the heat generating resistor and the platen 4, a mechanism is also provided which allows the inner side surface 11 of the U-groove positioning portion 7 to come into contact with the platen shaft 8 without a gap by the preload spring 9. There is also. For example, Japanese Patent Publication Sho 63-
No. 7157, Japanese Examined Patent Publication No. 3-35111, Japanese Unexamined Patent Publication No. 2-295757, Japanese Unexamined Patent Publication No. 3-57674, Japanese Unexamined Patent Publication No. 3-75175, and Japanese Utility Model Laid-Open No. 58-863.
Such a structure is disclosed in Japanese Patent Laid-Open No. 60, Japanese Utility Model Laid-Open No. 62-175925, Japanese Utility Model Laid-Open No. 63-194730, Japanese Utility Model Laid-Open No. 1-30239 and Japanese Utility Model Laid-Open No. 1-175826.

【0004】[0004]

【発明が解決しようとする課題】しかしながらこの方式
の保持機構には次のような課題があった。 プラテンローラ4の軸心と二つのヒンジピン3の軸心
が平行でない場合、サーマルヘッド1はプラテンローラ
4に対して傾いて保持されることになり、ヘッドの長手
方向の押圧力分布を均一にすることができず、濃度ムラ
やカスレが発生し印字品質を低下させてしまう。 ヘッド取付フレーム2の長穴部6の端面とヒンジピン
3との摺動抵抗が大きい場合、U溝位置決め部7の内側
面11とプラテン軸との当接が再現性よくなされず、位
置決め機構が確実に動作しなくなる。
However, the holding mechanism of this system has the following problems. When the axis of the platen roller 4 and the axis of the two hinge pins 3 are not parallel, the thermal head 1 is held tilted with respect to the platen roller 4, and the pressing force distribution in the longitudinal direction of the head is made uniform. This is not possible, and density unevenness and blurring occur and print quality deteriorates. When the sliding resistance between the end surface of the elongated hole portion 6 of the head mounting frame 2 and the hinge pin 3 is large, the contact between the inner side surface 11 of the U-groove positioning portion 7 and the platen shaft is not reproducible and the positioning mechanism is reliable. Will not work.

【0005】そこで、本発明は以上のような点に着目し
てなされたもので、サーマルヘッドの位置決め機構と、
サーマルヘッドとプラテンの平行ずれを吸収する機構と
を合わせ持ち、印字中の振動や衝撃等によってプラテン
やヘッドに位置ずれが生じても、常にヘッドとプラテン
の相対的な位置関係を維持し得るサーマルヘッドの保持
機構を提供することを目的とする。
Therefore, the present invention has been made by paying attention to the above points, and includes a positioning mechanism for a thermal head,
The thermal head and the mechanism that absorbs the parallel displacement of the platen are combined, and even if the platen or the head is displaced due to vibration or shock during printing, the thermal relationship between the head and the platen can always be maintained. It is an object to provide a head holding mechanism.

【0006】[0006]

【課題を解決するための手段】そこで上記課題を解決す
るために、本発明においてはサーマルヘッドを固定する
ためのヘッド取付フレームと、プラテンローラの回転支
持軸の回りにプラテンローラと独立して回転でき、かつ
プラテンローラの両軸端に軸着したベアリングと、ベア
リングの外輪に接触し、その接触面とサーマルヘッドの
発熱抵抗体の配置ラインとの垂直距離がベアリングの中
心から接触面までの距離に等しくなるように形状を規制
され、かつその基準面が平行になるようにヘッド取付フ
レームの両端に取着したヘッド位置決め板と、プラテン
ローラと略平行に熱転写型画像出力装置の外枠フレーム
に取り付けられた二つのヒンジピンとを設け、ヒンジピ
ンの外径の1.2〜1.5倍程度の寸法の幅で長手方向
の寸法がヒンジピンの外径の1.5〜2倍程度の長穴が
穿設されたポリアセタールなど潤滑性のある材料で成型
された受座をヘッド取付フレームの後部両端に止着し、
受座の長穴内にヒンジピンを貫通させて外枠フレームに
固定し、さらに位置決め板をベアリングに当接させるた
めに、ヘッド取付フレームと外枠フレームとの間にばね
を係止する構成とした。
In order to solve the above problems, according to the present invention, a head mounting frame for fixing a thermal head and a platen roller are rotated around a rotation supporting shaft independently of the platen roller. The vertical distance between the bearing, which can be mounted on both ends of the platen roller and the outer ring of the bearing, and the contact surface and the line where the heating resistor of the thermal head is arranged is the distance from the center of the bearing to the contact surface. The head positioning plates attached to both ends of the head mounting frame so that the reference surfaces are parallel to each other and the reference planes are parallel to the outer frame of the thermal transfer image output device substantially parallel to the platen roller. Two hinge pins attached are provided, and the width of the hinge pin is about 1.2 to 1.5 times the outer diameter of the hinge pin and the dimension in the longitudinal direction is the hinge pin. The seat of the long hole of about 1.5 to 2 times is molded by lubricious material such as polyacetal bored in outer diameter fixed to the rear ends of the head mounting frame,
A hinge pin is passed through the elongated hole of the seat to be fixed to the outer frame, and in order to bring the positioning plate into contact with the bearing, a spring is locked between the head mounting frame and the outer frame.

【0007】[0007]

【作用】上記のような構成にすれば、ヘッド取付フレー
ムは上下左右方向に一定範囲で遊動自在に保持され、印
字の際は左右方向は位置決め板が常にベアリングに当接
されているため、発熱抵抗体の配置ラインとプラテンと
の相対位置は一定に保たれる。
With the above-described structure, the head mounting frame is held movably in the vertical and horizontal directions within a certain range, and the positioning plate is always in contact with the bearings in the horizontal direction during printing. The relative position of the resistor arrangement line and the platen is kept constant.

【0008】さらに、上下方向はプラテンによって規制
され、ヘッドのプラテンに対する押圧力の均一性が確保
される。したがって、ヘッドの位置決め機構とヘッドプ
ラテン平行支持機構とを兼ね備えることとなる。
Further, the vertical direction is regulated by the platen, and the uniformity of the pressing force of the head on the platen is ensured. Therefore, the head positioning mechanism and the head platen parallel support mechanism are combined.

【0009】[0009]

【実施例】以下に本発明の一実施例を図面に基づいて説
明する。図1は本発明の一実施例を示す側面図、図3は
本発明の一実施例を示す正面図である。この図1におい
て、ヘッド取付フレーム2には、サーマルヘッド1の背
面に設けられた基準穴10に嵌合するボス(図示せず)
と、位置決め板16の取付位置を規制する位置決めピン
14が相互の位置関係を厳しく規制して突設されてい
る。そして、サーマルヘッド1は基準穴10を介して、
ネジ締結などでヘッド取付フレーム2の底面に固定さ
れ、また、ヘッド取付フレーム2の両側面には位置決め
板16を位置決めピン14を介して止着し、さらに位置
決め板16の位置決め基準面12はベアリング15に当
接している。このベアリング15は図3に示すように、
プラテンローラ4の両端に軸着されている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing an embodiment of the present invention, and FIG. 3 is a front view showing an embodiment of the present invention. In FIG. 1, the head mounting frame 2 has a boss (not shown) that fits into a reference hole 10 provided on the back surface of the thermal head 1.
The positioning pin 14 for restricting the mounting position of the positioning plate 16 is provided so as to strictly control the mutual positional relationship. Then, the thermal head 1 passes through the reference hole 10
It is fixed to the bottom surface of the head mounting frame 2 by screwing or the like, and positioning plates 16 are fixed to both side surfaces of the head mounting frame 2 via positioning pins 14, and the positioning reference surface 12 of the positioning plate 16 is a bearing. It is in contact with 15. This bearing 15 is, as shown in FIG.
The platen roller 4 is pivotally attached to both ends.

【0010】又、ヘッド取付フレームの後端両側面に長
穴部6を穿設した受座13が止着されている。この受座
13はポリアセタール、含油ポリアセタールなど摺動性
に優れた樹脂を用い成型されたものである。特にその長
穴部の寸法は図4に示すように、ヒンジピン3の直径d
に対し、幅1.2〜1.5d、長さ1.5〜2dとし、
上下左右方向にガタをもたせてある。さらに、ヘッド取
付フレーム2には予圧ばね9により印字方向に予圧がか
けられているため、位置決め板16の位置決め基準面1
2とベアリング15とが常に当接する方向にばね力が作
用する。
Further, receiving seats 13 having elongated holes 6 are fixed to both sides of the rear end of the head mounting frame. The seat 13 is molded using a resin having excellent slidability such as polyacetal or oil-containing polyacetal. In particular, the dimension of the elongated hole is, as shown in FIG. 4, the diameter d of the hinge pin 3.
In contrast, the width is 1.2 to 1.5d and the length is 1.5 to 2d,
There is play in the vertical and horizontal directions. Further, since the head mounting frame 2 is preloaded in the printing direction by the preload spring 9, the positioning reference plane 1 of the positioning plate 16 is used.
The spring force acts in a direction in which the bearing 2 and the bearing 15 are always in contact with each other.

【0011】以上のように構成すれば、予圧ばね9のば
ね力とサーマルヘッド1とインクシート(図示せず)の
摩擦力の作用により、印字中は位置決め板16はベアリ
ング15の外輪に常に当接しているため、位置決め板1
6とベアリング15との接触面である位置決め基準面1
2から発熱抵抗体の配置ラインまでの垂直距離は常に一
定となるので、例えば出荷時またはヘッド交換時にはも
とより、装置駆動源の振動などによって、プラテンロー
ラ4が水平方向にずれても、位置決め板16と一体とな
ってサーマルヘッド1を追随移動させるために、サーマ
ルヘッド1とプラテンローラ4の法線位置上にサーマル
ヘッド1の印字位置を一致させることができ、これによ
り、装置の動作時に振動等が生じても、サーマルヘッド
1とプラテン4とを適切な位置関係を保持して印字動作
させることができる。
With the above construction, the positioning plate 16 always contacts the outer ring of the bearing 15 during printing by the action of the spring force of the preload spring 9 and the frictional force of the thermal head 1 and the ink sheet (not shown). Positioning plate 1 due to contact
Positioning reference surface 1 which is a contact surface between the bearing 6 and the bearing 15.
Since the vertical distance from 2 to the placement line of the heating resistor is always constant, even if the platen roller 4 shifts in the horizontal direction due to vibration of the device driving source, for example, at the time of shipping or head replacement, the positioning plate 16 is The print position of the thermal head 1 can be aligned with the normal position of the thermal head 1 and the platen roller 4 in order to move the thermal head 1 in unison with the above. Even if occurs, the thermal head 1 and the platen 4 can perform the printing operation while maintaining an appropriate positional relationship.

【0012】又、プラテンローラ4の軸心17とヒンジ
ピン3の中心線18,19との距離L1,2 は図4に示
すように穴位置公差や取付公差などの影響によって、誤
差ε(≠0)をもつが、受座13とヒンジピン3とのガ
タ0.2d〜0.5dをこのεより大きくとってあれ
ば、図3のようにサーマルヘッド1はプラテン4に平行
な状態をとることが可能であり、その結果、サーマルヘ
ッド1とプラテンローラ4との間に均一な押圧力が無調
整で得られることになる。
Further, the distances L 1 and L 2 between the shaft center 17 of the platen roller 4 and the center lines 18 and 19 of the hinge pins 3 are error ε (due to the influence of hole position tolerance and mounting tolerance as shown in FIG. ≠ 0), but if the play between the seat 13 and the hinge pin 3 is 0.2d to 0.5d larger than this ε, the thermal head 1 will be parallel to the platen 4 as shown in FIG. As a result, a uniform pressing force can be obtained between the thermal head 1 and the platen roller 4 without adjustment.

【0013】[0013]

【発明の効果】以上説明したように本発明によれば、サ
ーマルヘッドとプラテンとの相対位置を調整する必要は
なく、装置の振動等によってサーマルヘッドおよびプラ
テンなどに位置ずれが生じてもサーマルヘッドの印字位
置とプラテンを常に適切な位置関係を保持して印字する
ことができるという効果がある。
As described above, according to the present invention, it is not necessary to adjust the relative positions of the thermal head and the platen, and even if the thermal head and the platen are displaced due to the vibration of the apparatus, the thermal head There is an effect that the printing position and the platen can always be printed while maintaining an appropriate positional relationship.

【0014】また、構成部品の加工精度や取付精度が多
少悪くても、自動調心的にサーマルヘッドとプラテンロ
ーラとを平行に維持し、押圧力の分布を均一にし、高品
質な印字を長期にわたって可能とするという効果も合わ
せもつ。
Further, even if the processing accuracy and the mounting accuracy of the components are somewhat poor, the thermal head and the platen roller are automatically aligned to keep the pressing roller in parallel with each other so that the pressing force is evenly distributed and high-quality printing is performed for a long time. It also has the effect of making it possible.

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

【図1】本発明による一実施例を示す側面図である。FIG. 1 is a side view showing an embodiment according to the present invention.

【図2】従来の一実施例を示す側面図である。FIG. 2 is a side view showing a conventional example.

【図3】本発明による一実施例を示す正面図である。FIG. 3 is a front view showing an embodiment according to the present invention.

【図4】本発明による受座の寸法図である。FIG. 4 is a dimensional drawing of a seat according to the present invention.

【符号の説明】[Explanation of symbols]

1 サーマルヘッド 2 ヘッド取付フレーム 3 ヒンジピン 4 プラテン 9 予圧ばね 10 基準穴 12 位置決め基準面 13 受座 15 ベアリング 16 位置決め板 1 Thermal Head 2 Head Mounting Frame 3 Hinge Pin 4 Platen 9 Preload Spring 10 Reference Hole 12 Positioning Reference Surface 13 Seat 15 Bearing 16 Positioning Plate

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 サーマルヘッドとプラテンローラとを含
む熱転写型画像出力装置において、サーマルヘッドを固
定するためのヘッド取付フレームと、プラテンローラの
回転支持軸の回りに前記プラテンローラと独立して回転
可能な前記プラテンローラの両軸端に軸着したベアリン
グと、前記ベアリングの外輪に接触し、その接触面と前
記サーマルヘッドの発熱抵抗体の配置ラインとの垂直距
離が、前記ベアリングの中心から前記接触面までの距離
に等しくなるように形状を規制され、かつその基準面が
平行になるように、前記ヘッド取付フレームの両端に取
着したヘッド位置決め板とを有することを特徴とするサ
ーマルヘッドの保持機構。
1. A thermal transfer image output device including a thermal head and a platen roller, wherein the head mounting frame for fixing the thermal head and the platen roller can be rotated independently of the platen roller around a rotation supporting shaft. The bearing vertically attached to both shaft ends of the platen roller and the outer ring of the bearing are in contact with each other, and the vertical distance between the contact surface and the arrangement line of the heating resistor of the thermal head is the contact from the center of the bearing. Holding a thermal head having a head positioning plate attached to both ends of the head mounting frame so that the shape is regulated so as to be equal to the distance to the surface, and the reference surfaces are parallel to each other. mechanism.
JP3320792A 1991-12-04 1991-12-04 Mechanism for retaining thermal head Pending JPH05155100A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3320792A JPH05155100A (en) 1991-12-04 1991-12-04 Mechanism for retaining thermal head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3320792A JPH05155100A (en) 1991-12-04 1991-12-04 Mechanism for retaining thermal head

Publications (1)

Publication Number Publication Date
JPH05155100A true JPH05155100A (en) 1993-06-22

Family

ID=18125297

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3320792A Pending JPH05155100A (en) 1991-12-04 1991-12-04 Mechanism for retaining thermal head

Country Status (1)

Country Link
JP (1) JPH05155100A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100699478B1 (en) * 2005-06-17 2007-03-26 삼성전자주식회사 Print head assembly and image forming apparatus having the same
JP2007178607A (en) * 2005-12-27 2007-07-12 Brother Ind Ltd Image forming apparatus
JP2008032836A (en) * 2006-07-26 2008-02-14 Brother Ind Ltd Image forming apparatus
EP1900539A2 (en) 2006-09-15 2008-03-19 Funai Electric Co., Ltd. Image generating apparatus
US7425973B2 (en) 2005-04-20 2008-09-16 Samsung Electronics Co., Ltd. Thermal type image forming apparatus
JP2009066801A (en) * 2007-09-11 2009-04-02 Mitsubishi Electric Corp Head holding mechanism
JP2011073372A (en) * 2009-09-30 2011-04-14 Seiko Instruments Inc Thermal printer
US20110128341A1 (en) * 2009-11-30 2011-06-02 Masanori Takahashi Thermal printer
JP2011183610A (en) * 2010-03-05 2011-09-22 Toshiba Tec Corp Printing unit and printing apparatus
US20120044313A1 (en) * 2010-08-17 2012-02-23 Seiko Epson Corporation Print Head, Printer, And Control Method of Printer
JP2015136805A (en) * 2014-01-20 2015-07-30 凸版印刷株式会社 image transfer device
JP2019162791A (en) * 2018-03-20 2019-09-26 ブラザー工業株式会社 Printer

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7425973B2 (en) 2005-04-20 2008-09-16 Samsung Electronics Co., Ltd. Thermal type image forming apparatus
KR100699478B1 (en) * 2005-06-17 2007-03-26 삼성전자주식회사 Print head assembly and image forming apparatus having the same
JP2007178607A (en) * 2005-12-27 2007-07-12 Brother Ind Ltd Image forming apparatus
JP4645446B2 (en) * 2005-12-27 2011-03-09 ブラザー工業株式会社 Image forming apparatus
JP2008032836A (en) * 2006-07-26 2008-02-14 Brother Ind Ltd Image forming apparatus
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