JPS61273982A - Apparatus for changing over position of ribbon - Google Patents

Abstract

PURPOSE:To make it possible to accurately determine the change-over position of a ribbon, by forming a plurality of engaging parts engaging a connection lever to stepwise determine the revolution position of said connection lever to the outer periphery of the cam supporting both sides of a ribbon base. CONSTITUTION:When a carrier is moved along a platen 3, a guide member 10 is also guided by a guide shaft 8 to be moved to a desired printing position along the platen 3. When a motor 13 is driven to rotate a cam 14, a ribbon base 5 revolves around a shaft 6. At this time, a connection lever 22 revolves around a shaft 19 and the guide shaft 8 moves to the same direction along with the guide member 10 corresponding to the moving amount of a ribbon cassette 4. The ribbon base 5 revolves around the shaft 6 but the guide shaft 8 and the guide member 10 move in the vertical plane parallel to the front surface of a printing head. Because the cam 14 stationary at a predetermined position is engaged with a pin 26 by engaging parts 15, 16, 17, 18, the cam 14 does not move to the rotary direction regardless of the presence of backlash between gears 11, 12 even if the motor 13 rotates to any direction.

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りボンベニ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 color-coded into multiple zones are stored in a cassette case, and the ribbon cassette is held or the ribbon ribbon 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間゛照点 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。The aim of the invention is to solve this problem because backlash occurs in the gear that transmits the rotation of the aiming point 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 same position is aimed. 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つるリボン位置切替装置
をうろことを目的とする。The purpose is to accurately determine the ribbon switching position and to measure the ribbon position switching device.

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１ｏ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１４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１５，１８，１７，１８を形成す
る。Means for Solving the Problems □ In this invention, a guide shaft 8 is installed to slidably guide a guide member 1o for guiding the ribbon 4a in the running direction parallel to the platen 3, and the guide shaft 8 is installed on both sides of the ribbon base 3. The gear 11 is driven by the motor 13 to support the cam 14.
．． Connecting rods 22 are connected to both ends of the guide shaft 8 and are connected to both ends of the guide shaft 8 to rotate in the same direction as the operating direction of the ribbon base 5 by contacting the cam 14 which rotates once and is arranged on the same axis. A plurality of locking portions 15, 18, 17, and 18 are formed on the outer periphery to engage with the connecting rod and determine the rotational position of the connecting rod 22 in stages.

作用 カム１４が回転するとりボンペース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とを係合させてカム１４を固定する。したが
って。When the action cam 14 rotates, the bomb pace 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
The cam 14 is fixed by engaging with the connecting rod 22. therefore.

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。The position of the ribbon base 5 and the guide member 10 is 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りボンペース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１０
は前述したキャ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 cassette 4 is removably held in these frames 1 and 2, and a bon paste 5 is rotatably held around 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 that guides 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 10
is also held in the carrier described above 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１５，１６，１７，
１８が形成されている。また、フレーム１，２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に嵌合す為切欠
２３が形成されている。他方のリンク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１
４の係止部１５゜１６．１７，１８の何れかに係合する
ピン２６が立設されている。そして、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 15, 16, 17,
18 are formed. Further, shafts 19 are erected on the outside of the frames 1 and 2, and a connecting rod 22 formed by connecting two links 20 and 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 for fitting into the guide shaft 8. The other link 20 has a shaft 19
A long hole 25 is formed for passing a screw 24 which is slidably fitted into the cam 1 and which is screwed into the link 21.
A pin 26 that engages with any of the locking portions 15, 16, 17 and 18 of 4 is provided upright. Both ends of the guide shaft 8 are urged downward by a 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を回すとりボンペース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. Then, the Bonpace 5, which drives the motor 13 and rotates the cam 14, 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）、シたがって、リボン４ａのどのゾーンを印
字部［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 cassette 4. The ribbon base 5 rotates about an axis 6, while 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. 4 to 7), thus: No matter which zone of the ribbon 4a is located at the printing section [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をもってビン２６に係合するため、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,
16, 17, and 18 engage the pin 26, so that 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の力はピン２６との係合力を強めカム
１４の動きを効果的に阻止する。したかって、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。Furthermore, the force of the spring 27 strengthens the engagement force with the pin 26 and effectively prevents the movement of the cam 14. 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、案内部材パ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、連杆に係合する係止部を
カムに形成することにより、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の静゛　　　　　　　
正位置を定め、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 to maintain the appropriate distance between any zone of the ribbon facing the printing position and the platen. Furthermore, by forming a locking part on the cam that engages with the connecting rod, the cam remains stationary regardless of the presence or absence of backlash between the gears that drive the cam.
It has the advantage of being able to determine the correct position and maintain the ribbon switching position 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図はりボンペ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図はりボンペース
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７図はりボンペースの昇降動作を
示す一部の側面図である。The drawings show one embodiment of the present invention, and FIG. 1 is a perspective view, FIG. 2 is an enlarged side view of a portion of the beam bon pace in the lowest position, and FIG. 3 is a partial side view of the beam bon pace. FIGS. 4 to 7 are side views of a portion showing the lifting and lowering movement of the beam Bonpace. FIGS.

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 provided 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 by: