JPS61280982A - Apparatus for changing over position of ribbon - Google Patents

Abstract

PURPOSE:To keep the change-over position of a ribbon in an extremely accurate manner, by determining the interval between any zone of a ribbon and a platen properly and uniformly even if any zone of the ribbon is opposed to a printing position and regulating the length of a connection link even if the distance between the rotation center of a cam and that of the connection link gets out of the predetermined value. 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 is mounted and cams 14 supporting both sides of a ribbon base 3 are connected to gears 11, 12 driven by a motor 13 to be arranged on the same axis and a pair of left and right connection links 22 freely extensible and contractable and freely fixed in an arbitrary length are provided in a freely revolvable manner and one ends of the connection links 22 are contacted with the cams 14 while the other ends thereof are connected to both ends of the guide shaft 8. The cams 14 are stopped at a predetermined position to stop the ribbon base 5 and the guide member 10 at a desired position but, by regulating the lengths of the connection links 22, the distance reaching the contact position with each cam 14 from the rotation center of each connection link 22 is determined. Therefore, the positions of the ribbon base and the guide member 10 are accurately kept.

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。2. Description of the Related Art Conventionally, a ribbon cassette for multiple colors is provided in which ribbons color-coded into multiple zones are stored in a cassette case, and a ribbon base holding the ribbon cassette is rotated to an arbitrary position to select a desired color zone. There is one that prints in multiple colors by 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 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、−ジンを取らなければならな
い。Problems to be Solved by the Invention Because backlash occurs in the gear that transmits the rotation of the motor to the cam, 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 taken 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、伸縮自在及び任意長さに固定自在の左
右一対の連杆２２を回動自在に設け、連杆２２の一端を
回転するカム１４に当接し他端を案内軸８の両端に連結
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 pair of left and right connecting rods 22 that can be expanded and contracted and fixed to any length are rotatably provided, and one end of the connecting rods 22 is provided. contacts the rotating cam 14, and the other end is connected to both ends of the guide shaft 8.

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、連杆２２の長さを調節すること
により、連杆２２の回動支点からカム１４に対する接触
位置に至る距離を定める。したがって、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. However, by adjusting the length of the connecting rod 22, the rotation fulcrum of the connecting rod 22 can be moved from the pivot point to the cam 14. Determine the distance to the contact position. Therefore, ribbon base 5
The positions of the guide member 10 and the guide member 10 are maintained accurately.

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 the present 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 base 5 that removably holds a ribbon cassette 4 is rotatably held on these frames 1.2 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, 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に嵌合する切欠
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、また力ｔ１
１４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 to fit into the guide shaft 8. The other link 20 has a shaft 19
A long hole 25 is formed to allow the screw 24 to be slidably fitted into the link 21 to pass therethrough, and the force t1
A pin 26 that engages with any one of the 14 locking portions 15, 16, 17, and 18 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。Further, 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１ｏ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のどのゾニンを印
字位置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 the shaft 6, while the guide shaft 8 and the guide member 1o move in a vertical plane parallel to the front surface of the print head (see FIGS. 4 to 7). Therefore, no matter which zone of the ribbon 4a is positioned 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、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 gears 11, 17, and 18 engage pin 26, gears 11, 12
The cam 14 does not move in the rotational direction regardless of the presence or absence of backlash.

また、発条２７の力はピン２６との係合力を強めカム１
４の動きを効果的に阻止する。In addition, the force of the spring 27 increases the engagement force with the pin 26 and the cam 1
4 movement is effectively prevented.

さらに、螺子２４を緩めリンク２０をリンク２１に対し
てスライドし螺子２４を締め直して連杆２２の長さを調
節することにより、軸１９からピン２６までの距離を変
えることができる。したがって、カム１４と連杆２２と
の中心距離が狂っても連杆２２の回動範囲を調節してリ
ボン切替位置すなわち案内部材１０の位置を極めて正確
にすることができる。Further, the distance from the shaft 19 to the pin 26 can be changed by loosening the screw 24, sliding the link 20 relative to the link 21, and tightening the screw 24 again to adjust the length of the connecting rod 22. Therefore, even if the center distance between the cam 14 and the connecting rod 22 is out of alignment, the rotation range of the connecting rod 22 can be adjusted to make the ribbon switching position, that is, the position of the guide member 10, 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、カムの回転中心と連杆の回
動中心との距離が狂っても、連杆の長さを調節しリボン
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. Even if the distance between the center of rotation of the cam and the center of rotation of the connecting rod is incorrect, the length of the connecting rod can be adjusted to maintain the ribbon switching position extremely accurately. It has the following effects.

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

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７図はリボンベースの昇降動作を
示す一部の側面図、第８図は連杆の支持構造を示す水平
断面図、第９図は連杆の分解斜視図である。 ３・・・プラテン、４・・・リボンカセット、４ａ・・
・リボン、５・・・リボンベース、８・・・案内軸、１
０・・・案内部材、１１．１２・・・ギヤ、１３・・・
モータ、１４・・・カム、２２・・・連杆The drawings show an embodiment of the present invention; FIG. 1 is a perspective view, FIG. 2 is an enlarged side view of a portion of the ribbon base in its lowest position, and FIG. A partial side view showing an enlarged view of the ribbon base in its highest position; FIGS. 4 to 7 are partial side views showing the lifting and lowering movement of the ribbon base; FIG. A horizontal sectional view showing the support structure, and FIG. 9 is an exploded perspective view of the connecting rod. 3...Platen, 4...Ribbon cassette, 4a...
・Ribbon, 5... Ribbon base, 8... Guide shaft, 1
0...Guide member, 11.12...Gear, 13...
Motor, 14...cam, 22...connection

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、伸縮自在及び任意長さに固定自在の左右
一対の連杆を前記リボンベースの回動方向と同方向に回
動自在に設け、前記連杆の一端を回転する前記カムに当
接し他端を前記案内軸の両端に連結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 a pair of left and right connecting rods that can be expanded and contracted and fixed to any length are connected to the ribbon base. A ribbon position switching device, wherein the ribbon position switching device is rotatable in the same direction as the rotation direction of the base, one end of the connecting rod is in contact with the rotating cam, and the other end is connected to both ends of the guide shaft.