JPS61280980A - Apparatus for changing over position of ribbon - Google Patents

Abstract

PURPOSE:To obtain a ribbon position change-over apparatus capable of accurately determining the change-over position of a ribbon, by cooperating a guide shaft with a guide member by a connection link so as to move the guide member to the same direction corresponding to the moving amount of a ribbon base when the ribbon base is revolved to a desired ribbon change-over position by rotating a cam. CONSTITUTION:A guide shaft 8 for guiding a guide member 10, which guides a ribbon to a running direction, in parallel to a platen 3 in a freely slidable manner is mounted and the cams 14 supporting both sides of a ribbon base 5 is connected to gears 11, 12 driven by a motor 113 to be arranged on the same axis and connection links 22 revolving to the same direction as the operation direction of the ribbon base 5 in a state contacted with the rotating cams 14 are provided so as to be connected to both ends of the guide shaft 8 and several engaging parts 15, 16, 17, 18 stepwise determining the revolution positions of said connection links 22 in a state engaged with the connection links 22 are formed to the outer peripheries of the cams 14 and the connection links 22 are energized to one direction. Therefore, the cams and connection links can be effectively stabilized at constant positions regardless of the presence of the backlash between gears driving the cams and a ribbon change-over position is kept extremely accurate.

Description

【発明の詳細な説明】 産業上の利用分野 この発明は、リボン位置切替装置に関する。[Detailed description of the invention] Industrial applications The present invention relates to a ribbon position switching device.

従来の技術 従来、複数のゾーンに色分けされたリボンをカセットケ
ースに収納した多色用のリボンカセットを設け、このリ
ボンカセットを保持するリボンベースを任意位置に回動
させて所望の色のゾーンを印字位置に対向させて多色印
字するようにしたものがある。Conventional technology Conventionally, a ribbon cassette for multiple colors is provided in which ribbons that are color-coded into multiple zones are stored in a cassette case, and a ribbon base that holds this ribbon cassette is rotated to an arbitrary position to select the desired color zone. There is one that prints in multiple colors facing the printing position.

また、モータの回転をギヤを介してカムに伝達し、この
カムによりリボンベースを回動させる手段が多用されて
いる。Also, a method is often used in which the rotation of a motor is transmitted to a cam via a gear, and the ribbon base is rotated by the cam.

発明が解決しようとする問題点　　。The problem that the invention aims to solve.

モータの回転をカムに伝達するギヤにはバックラッシュ
が発生するため、リボンベースの位置は同じ位置を狙っ
てもモータの回転方向が変わる度に異なる。したがって
、ゾーンの幅に多少のマージンを取らなければならない
。Backlash occurs in the gear that transmits the rotation of the motor to the cam, so the position of the ribbon base changes every time the direction of rotation of the motor changes, even if the ribbon base is aimed at the same position. Therefore, some margin must be made for the width of the zone.

この発明はこのような点に鑑みなされたもので。This invention was made in view of these points.

リボンの切替位置を正確に定めうるリボン位置切替装置
をうろことを目的とする。The purpose of the present invention is to provide a ribbon position switching device that can accurately determine the ribbon switching position.

問題点を解決するための手段 この発明は、リボン４ａを走行方向へ案内するための案
内部材１０をプラテン３と平行に摺動自在に案内する案
内軸８を架設し、リボンベース３の両側を支えるカム１
４をモータ１３に駆動されるギヤ１１．１２に連結して
同軸上に配列し１回転するカム１４に当接してリボンベ
ース５の動作方向と同方向へ回動する連杆２２を案内軸
８の両端に連結して設け、カム１４の外周に連杆と係合
してこの連杆２２の回動位置を段階的に定める複数の係
止部１５，１６．１７．１８を形成し、連杆２２を一方
向へ付勢する。Means for Solving the Problems In the present invention, a guide shaft 8 is installed to slidably guide a guide member 10 for guiding the ribbon 4a in the running direction parallel to the platen 3, and both sides of the ribbon base 3 are Supporting cam 1
4 are connected to gears 11 and 12 driven by a motor 13 and arranged on the same axis, and a connecting rod 22 that rotates in the same direction as the operating direction of the ribbon base 5 is connected to the guide shaft 8. A plurality of locking portions 15, 16, 17, and 18 are formed on the outer periphery of the cam 14 to engage with the connecting rod and determine the rotational position of the connecting rod 22 in stages. The rod 22 is biased in one direction.

作用 カム１４が回転するとリボンベース５が回動するととも
に連杆２２が回動し、案内軸８が案内部材１０とともに
リボンベース５と同方向へ回動する。カム１４は所定の
位置に静止してリボンベース５と案内部材１０とを所望
の位置に静止させるが、係止部１５，１６，１７，１８
と連杆２２とを係合させる。かつ連杆２２を付勢して係
止部１５．１６，１７，１Ｂに弾発的に係合させる。こ
れにより、カム１４と連杆２２とを一定位置に安定させ
る。したがって、ギヤ１１．１２のバックラッシュの有
無に拘らずリボンベース５と案内部材１０との位置が正
確に維持される。When the action cam 14 rotates, the ribbon base 5 rotates, the connecting rod 22 also rotates, and the guide shaft 8 rotates together with the guide member 10 in the same direction as the ribbon base 5. The cam 14 is stationary at a predetermined position and the ribbon base 5 and the guide member 10 are stationary at a desired position, but the locking portions 15, 16, 17, 18
and the connecting rod 22 are engaged. In addition, the connecting rod 22 is urged to resiliently engage with the locking portions 15, 16, 17, and 1B. This stabilizes the cam 14 and the connecting rod 22 in a fixed position. Therefore, the positions of the ribbon base 5 and the guide member 10 are maintained accurately regardless of the presence or absence of backlash of the gears 11, 12.

実施例 この発明の一実施例を図面に基づいて説明する。Example An embodiment of this invention will be described based on the drawings.

相対向するフレーム１，２にプラテン３が回転自在に保
持されている。これらのフレーム１，２にはリボンカセ
ット４を着脱自在に保持するリボンベース５が軸６を支
点に回動自在に保持されている。第１図において左側の
フレーム１の一部及びリボンベース５の左側を切り欠い
て示すが、フレーム１，２には駆動軸７が回転自在に保
持されているとともに、案内軸８の両端を上下動自在に
保持する長孔９が形成されている。また、フレーム１．
２には図示しないが印字部が搭載されたキャリアをプラ
テン３にそって摺動自在に保持するキャリアシャフトが
架設されている。案内軸８にはリボンカセット４のリボ
ン４ａをプラテン３と平行な走−行方向へ案内する案内
部材１０が摺動自在に保持されている。この案内部材１
０は前述したキ、ヤリアにもリボン走行方向と直交する
方向へ摺動自在に保持されている。A platen 3 is rotatably held by opposing frames 1 and 2. A ribbon base 5 that removably holds a ribbon cassette 4 is rotatably held on these frames 1 and 2 about a shaft 6 as a fulcrum. In FIG. 1, a part of the left frame 1 and the left side of the ribbon base 5 are shown cut away, but the frames 1 and 2 rotatably hold the drive shaft 7, and both ends of the guide shaft 8 are moved up and down. A long hole 9 for movably holding is formed. Also, frame 1.
Although not shown in the drawings, a carrier shaft 2 is installed to slidably hold a carrier on which a printing section is mounted along the platen 3. A guide member 10 for guiding the ribbon 4a of the ribbon cassette 4 in a running direction parallel to the platen 3 is slidably held on the guide shaft 8. This guide member 1
0 is also held in the above-mentioned keys so as to be slidable in a direction perpendicular to the ribbon running direction.

駆動軸７の左端にはギヤ１１が固定され、このギヤ１１
に噛合されたギヤ１２がモータ１３に直結されている。A gear 11 is fixed to the left end of the drive shaft 7.
A gear 12 meshed with is directly connected to a motor 13.

また、駆動軸７の両端にはカム１４が固定され、これら
のカム１４の外周には凹状の係止部１５ｊ　１６，１７
．１８が形成されている。また、フレー１ｓ１，２の外
側には軸１９が立設され、これらの軸１９には二枚のリ
ンク２０゜２１を連結してなる連杆２２が回動自在に保
持されている。すなわち、一方のリンク２１は軸１９に
回動自在に保持されており先端には案内軸８に嵌合する
切欠２３が形成されている。他方のりンク２０には、軸
１９に摺動自在に嵌合されるとともにリンク２１に螺合
する螺子２４を通すための長孔２５が形成され、またカ
ム１４の係止部１５゜１６．１７．１８の何れかに係合
するピン２Ｇが立設されている。そして、連杆２２の後
端及び案内軸８の両端は発条２７により下方へ付勢され
ている。Further, cams 14 are fixed to both ends of the drive shaft 7, and concave locking portions 15j 16, 17 are provided on the outer periphery of these cams 14.
．． 18 are formed. Further, shafts 19 are erected on the outside of the frames 1s1 and 2, and a connecting rod 22 formed by connecting two links 20.degree. 21 is rotatably held on these shafts 19. That is, one link 21 is rotatably held by the shaft 19, and has a notch 23 formed at its tip to fit into the guide shaft 8. The other link 20 is formed with an elongated hole 25 that is slidably fitted onto the shaft 19 and through which a screw 24 that is screwed into the link 21 is passed. A pin 2G that engages with any one of .18 is provided upright. The rear end of the connecting rod 22 and both ends of the guide shaft 8 are urged downward by the spring 27.

さらに、リボンカセット４のリボン巻取軸２８に着脱自
在に係合される駆動軸２９が設けられている。Furthermore, a drive shaft 29 is provided which is detachably engaged with the ribbon winding shaft 28 of the ribbon cassette 4.

このような構成において、キャリアをプラテン３にそっ
て、移動させると案内部材１０も案内軸８に案内されて
プラテン３にそって所望の印字位置に移動する。そして
モータ１３を駆動しカム１４を回すとリボンベース５が
軸６を支点に回動する。この時に、連杆２２が軸１９を
支点に回動し。In such a configuration, when the carrier is moved along the platen 3, the guide member 10 is also guided by the guide shaft 8 and moves along the platen 3 to a desired printing position. When the motor 13 is driven and the cam 14 is rotated, the ribbon base 5 rotates about the shaft 6. At this time, the connecting rod 22 rotates about the shaft 19 as a fulcrum.

案内軸８が案内部材１０とともにリボン、カセット４の
移動量に対応して同方向へ移動する。リボンベース５は
軸６を中心に回動するが、案内軸８と案内部材１０とは
印字ヘッドの前面と平行な垂直面を移動する（第４図〜
第７図参照）。したがって、リボン４ａのどのゾーンを
印字位［Ａに位置させてもそのゾーンとプラテン３との
間隔を適正な一定間隔に定めることができる。The guide shaft 8 moves together with the guide member 10 in the same direction in accordance with the amount of movement of the ribbon and the cassette 4. The ribbon base 5 rotates around a shaft 6, but the guide shaft 8 and the guide member 10 move in a vertical plane parallel to the front surface of the print head (see Figs.
(See Figure 7). Therefore, no matter which zone of the ribbon 4a is located at the printing position [A], the distance between that zone and the platen 3 can be set at an appropriate constant distance.

この時、所定の位置に静止するカム１４は係止部１５，
１６，１７．１８をもってピン２６に係合するため５モ
ータ１３が何れの方向へ回転しようともギヤ１１．１２
間のバックラッシュの有無に拘らずカム１４は回転方向
へ動くことがない。At this time, the cam 14, which is stationary at a predetermined position, has a locking portion 15,
Since the gears 16, 17, and 18 engage the pin 26, no matter which direction the motor 13 rotates, the gears 11, 12
The cam 14 does not move in the rotational direction regardless of the presence or absence of backlash.

しかも、発条２７の力はビン２６との係合力を強めカム
１４及び連杆２２の動きを効果的に阻止する。したがっ
て、リボン切替位置すなわちリボンベース５と案内部材
１０との位置は極めて正確である。Moreover, the force of the spring 27 strengthens the engagement force with the pin 26 and effectively prevents the movement of the cam 14 and the connecting rod 22. Therefore, the ribbon switching position, that is, the position of the ribbon base 5 and the guide member 10 is extremely accurate.

発明の効果 この発明は上述のように構成したので、カムを回転させ
てリボンベースを所望のリボン切替位置に回動させる時
に、連杆により案内軸を案内部材とともにリボンベース
の移動量に対応して同方向へ連動させることができ、し
たがって、案内部材を印字ヘッドの前面と平行な面内で
移動させ、リボンのどのゾーンを印字位置に対向させて
もそのゾーンとプラテンとの間隔を適正な均一な間隔に
定めることができ、さらに、カムに係止部を形成し連杆
を付勢することにより、カムを駆動するギヤ間のバック
ラッシュの有無に拘らずカム及び連杆を効果的に定位置
に安定させることができ、リボン切替位置を極めて正確
に維持することができる等の効果を有する。Effects of the Invention Since the present invention is configured as described above, when the cam is rotated to rotate the ribbon base to a desired ribbon switching position, the guide shaft is moved along with the guide member by the connecting rod to correspond to the amount of movement of the ribbon base. Therefore, the guide member can be moved in a plane parallel to the front surface of the print head, and the distance between any zone of the ribbon facing the print position can be adjusted to the proper distance between that zone and the platen. By forming a locking part on the cam and urging the connecting rod, the cam and connecting rod can be set at uniform intervals regardless of the presence or absence of backlash between the gears that drive the cam. It has the advantage that it can be stabilized in a fixed position and the ribbon switching position can be maintained extremely accurately.

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

図面はこの発明の一実施例を示すもので、第１図は斜視
図、第２図はリボンベースを最下降位置に位置させた状
態を拡大して示す一部の側面図。 第３図はリボンベースを最上昇位置に位置させた状態を
拡大して示す一部の側面図、第４図ないし第７ｒＪＲは
リボンベースの昇降動作を示す一部の側面図である。The drawings show an embodiment of the present invention; FIG. 1 is a perspective view, and FIG. 2 is a partially enlarged side view of the ribbon base in its lowest position. FIG. 3 is a partially enlarged side view showing the ribbon base in its highest position, and FIGS. 4 to 7rJR are partially side views showing the raising and lowering movement of the ribbon base.

Claims (1)

【特許請求の範囲】[Claims] 多色用のリボンカセットを保持するリボンベースをプラ
テンの長手方向と直交する方向に回動自在に設け、印字
部を保持して前記プラテンにそつて移動するキャリア又
は前記印字部に前記リボンカセットのリボンの走行を案
内する案内部材をこのリボンの走行方向と直交する直線
方向に移動自在に連結し、前記案内部材を前記プラテン
と平行に摺動自在に案内する案内軸を架設し、前記リボ
ンベースの両側を支えて前記リボンベースを任意位置に
静止させるカムをモータに駆動されるギヤに連結して同
軸上に配列し、回転する前記カムに当接して前記リボン
ベースの動作方向と同方向へ回動する連杆を前記案内軸
の両端に連結して設け前記カムの外周に前記連杆と係合
してこの連杆の回動位置を段階的に定める複数の係止部
を形成し前記連杆を一方向へ付勢して前記連杆と前記カ
ムの前記係止部とを弾発的に係合させたことを特徴とす
るリボン位置切替装置。A ribbon base holding a multi-color ribbon cassette is rotatably provided in a direction perpendicular to the longitudinal direction of the platen, and a carrier holding a printing part and moving along the platen or the printing part holds the ribbon cassette. A guide member for guiding the running of the ribbon is connected to be movable in a straight line orthogonal to the running direction of the ribbon, a guide shaft is provided for slidably guiding the guide member parallel to the platen, and the ribbon base A cam that supports both sides of the ribbon base and stops the ribbon base at a desired position is connected to a gear driven by a motor and arranged on the same axis, and comes into contact with the rotating cam and moves in the same direction as the operating direction of the ribbon base. A rotating connecting rod is connected to both ends of the guide shaft, and a plurality of locking portions are formed on the outer periphery of the cam to engage with the connecting rod and stepwise determine the rotational position of the connecting rod. A ribbon position switching device characterized in that the connecting rod is biased in one direction to elastically engage the connecting rod and the locking portion of the cam.