JPH0336039A - Hammer swing mechanism of line printer - Google Patents

Abstract

PURPOSE:To enable a good printing quality little variation compact cam mechanism to be formed by a method wherein an edge surface of a cylinder is used as a cam surface, cam rollers are provided at positions of which phases are shifted by 180 deg. to each other, and a constant speed part is provided to its variation curve. CONSTITUTION:A balancer 4 shares guide shafts 3 as a guide, and its straight line motion is guided therewith. Two cam rollers 5, 5' exist on a carrier 2, cam rollers 6, 6' are arranged on the balancer 4, and an edge surface of a cam 7 is so pinched between them as to be free from backlash. The cam 7 is formed in a unitary body with a shaft, is supported with a bearing 8, and is integrated into a cam block 9. The mass of the carrier and the balancer is equalized, and the cam rollers are arranged at positions whose phases are shifted by 180 deg. to the surface of the cam. Further, since cam rollers at two positions of the carrier and the balancer can be practically operated inside one piece of the cam, only one piece of the cam is enough and a support part of the cam roller can be also designed to be small.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、ラインプリンタのプリントハンマを揺動する
機構に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mechanism for swinging a print hammer of a line printer.

〔従来の技術〕[Conventional technology]

従来ラインプリンタは、処理速度を早めるために複数個
のハンマを一列にならべ、高速で左右に揺動させ印字を
行なってきたがその手段としては偏心カムとクランクを
用い、モータの回転運動を直線運動に変換する場合と、
円板の外周ＬＩＩｌｉＶｃカムを切シ、２ケのローラで
はさみこんで所定の変位を得る場合がほとんどであった
。Conventional line printers have used multiple hammers lined up in a line and swung left and right at high speed in order to speed up the processing speed. When converting into exercise,
In most cases, the LIIliVc cam around the outer circumference of the disk was cut and sandwiched between two rollers to obtain a predetermined displacement.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

しかし、偏心カムとクランクを用いた場合は、その這＃
は三角関数波状の速度分布をもち、プリントハンマはあ
る範囲内のすべての周波数で応答することが要求される
とともに、等速で動かした場合より高い周波数で応答す
ることが必要になる。However, when using an eccentric cam and crank,
has a trigonometric wave-like velocity distribution, and the print hammer is required to respond at all frequencies within a certain range, and at a higher frequency than if it were moved at a constant speed.

また、板カムの外周を用いｆｃ場合は、カムの変位曲線
によってはプリントハンマを塔載したキャリアを′Ｊ＃
迷で＠ｌＩ！ｌｌ運動させることができるがカムローラ
で、板カムの両側をぼぎみ込む為に大きな保持機構を設
ける必要がろ９、さらに、上記キャリア部の直緘運ｗＪ
／ｌｃよって生ずる力を、外部へ伝えない為にキャリア
と同じ重Ｒ’ｆ：もコバ２ンｔをキャリアの運動と逆位
相で運動させる必要があり、その為にもうｌ板の板カム
と、カムローラを設けねばならなかった。In addition, when using the outer periphery of a plate cam, depending on the cam's displacement curve, the carrier on which the print hammer is mounted may be
I'm confused @lI! Although it is possible to move the cam roller, it is necessary to provide a large holding mechanism to squeeze both sides of the plate cam.
In order to prevent the force generated by /lc from being transmitted to the outside, it is necessary to move the same weight R'f as the carrier in the opposite phase to the movement of the carrier. , a cam roller had to be installed.

〔課題を解決するための手段〕[Means to solve the problem]

本発明は、円筒の両端面を走行面とするカムを用いその
変位曲線に等速部を設け、さらにその１周期を２等分し
て全く逆位相のカムを作Ｃ１１８０度ずれた位置に同じ
質ｉｔをもつキャリアとバランサのカムローラを配置す
ることにより上記欠点を解決し、一定の周波数でプリン
トハンマを駆動することができ、１個のカムでキャリア
とバランサの運動の釣合をとり、カムローラの保持機構
を小さくできるようにした装置を提供することにある。The present invention uses a cam whose running surfaces are both end surfaces of a cylinder, provides a constant velocity part in its displacement curve, and further divides one period into two to create a cam with completely opposite phases at the same position shifted by 1180 degrees. By arranging the cam rollers of the carrier and balancer with high quality, the above disadvantages can be solved and the print hammer can be driven at a constant frequency. It is an object of the present invention to provide a device in which the holding mechanism of the device can be made small.

モータと連結された回転軸上に円筒の両端面を走行面と
するカムを配置し、その変位曲線は、部に等速部をもち
１８０°で位相が全く対称になるような形状にする。こ
のカムをはさみ込む２個のローラからなるカムフォロワ
一部をプリントハンマを塔載したキャリア部上に設け、
カムを回転させるとキャリア部は変位曲線に従かい左右
に直線運動を行なう。A cam whose running surfaces are both end surfaces of a cylinder is placed on a rotating shaft connected to a motor, and its displacement curve is shaped so that it has constant velocity sections and is completely symmetrical in phase at 180 degrees. A part of the cam follower consisting of two rollers that sandwich this cam is installed on the carrier part on which the print hammer is mounted.
When the cam is rotated, the carrier section moves linearly from side to side following the displacement curve.

また、プリント・・ンマとキャリアを合計した質量と同
じ質ｆをもつバランサ上にも前記と同じカム７才ロワ一
部を設け、それをカムの回転軸に対して前記キャリア上
のカムフォロワ一部と対称の位ｔｌｔＫ配置すｉｔば、
キャリア部とバランサーの運動によってカムに加わる力
を相殺し、外部に対してＳ動を絶縁することができる。In addition, a part of the same 7-year-old cam lower as described above is provided on a balancer having the same quality f as the total mass of the printing machine and the carrier, and it is attached to a part of the cam follower on the carrier with respect to the rotation axis of the cam. If you place tltK in a symmetrical position,
The movement of the carrier section and balancer cancels out the force applied to the cam, making it possible to isolate the S motion from the outside.

〔実施例〕〔Example〕

次に本発明について図面を参照して詳細に説明する。 Next, the present invention will be explained in detail with reference to the drawings.

本発明の実施例を示す第１図、第２図にｐいてプリント
ハンマ１を塔載したキャリア２１−１．．２本のガイド
シャフト３に案内され、左右に直線運動を行なう。神」
様にバランサ４も前記ガイドシャフト３を案内として共
用し、直線運動のガイドとしている。キャリア２上には
、２ケのカムローラ５及び５′　があり、バランサ４上
にはカムロー２６及び６′が配置され、カム７の端面會
ガタのないよう［ｒｊさみ込んでいる。カム７はシャフ
トと一体に形成され、軸受８で支持され、カムブロック
９に組込まれ、その一端はモータ１０ｉＣ連絡されてい
る。A carrier 21-1 on which a print hammer 1 is mounted is shown in FIGS. 1 and 2 showing an embodiment of the present invention. ．． It is guided by two guide shafts 3 and performs linear movement left and right. God"
Similarly, the balancer 4 also uses the guide shaft 3 as a guide, and serves as a guide for linear motion. There are two cam rollers 5 and 5' on the carrier 2, and cam rows 26 and 6' are arranged on the balancer 4, and are inserted into the cam 7 so that there is no play in the end face thereof. The cam 7 is formed integrally with the shaft, supported by a bearing 8, and incorporated into a cam block 9, one end of which is connected to the motor 10iC.

今、モータｌＯが、回転しはじめると、シャフトを通じ
カム７が回転する。カム７の端面は、カムの走行面にな
ってかりその質位曲巌は、印字中に相当する等連９Ａ城
と方向を変えるための変曲領域とからなう、１８０°で
全く逆位相になる様に設計されているので、モータｌＯ
が一定速度で回転すると、キャリア２及びバランサ４は
、互い逆方向に動きながら一定速度をもった直線運動と
、方向転換を行なう、プリントハンマ１が一定速度をも
ったｖｉ線運動をしている間にドライブされると、等間
隔の文字又はドツトを印字することができる。Now, when the motor lO starts rotating, the cam 7 rotates through the shaft. The end face of the cam 7 becomes the running surface of the cam, and its quality curve is completely opposite in phase at 180°, consisting of a continuous 9A castle corresponding to printing and an inflection area for changing the direction. Since it is designed so that the motor lO
When the print hammer 1 rotates at a constant speed, the carrier 2 and balancer 4 move in opposite directions to each other in a linear motion at a constant speed, and the print hammer 1 performs a V-line motion at a constant speed. When driven in between, evenly spaced characters or dots can be printed.

以上説明した様に、一定速度で直線運動を行なうことが
できればプリントハンマは一定周期でドライブするだけ
で良く、また印字結果も等間隔の奇麗なものが得られ、
特にドツトで文字を構成するドブトラインプリンタの場
合には、文字の伸び縮みや斜め縁の変形のない良好な文
字が得られる。As explained above, if linear motion can be performed at a constant speed, the print hammer only needs to be driven at a constant cycle, and the print results can be printed at even intervals.
Particularly in the case of a dot line printer in which characters are made up of dots, good characters can be obtained without stretching or shrinking the characters or deforming the diagonal edges.

また、キャリアとバランサの質ｆを回−にし、カムの面
に対して１８０°位相をずらした位ＩＪｆｔＶＣカムロ
ーラを配置することにより、直線運動によりカムに加わ
る力を互いに相殺しカムブロックの軸受部や、モータに
余分な力が加わることを防止し、ひいては装置全体が振
動するのを防いでいる。In addition, by changing the quality of the carrier and balancer f and arranging the IJftVC cam roller 180 degrees out of phase with respect to the cam surface, the forces applied to the cam due to linear motion are canceled out by each other, and the bearing of the cam block This prevents excessive force from being applied to the motor and the motor, which in turn prevents the entire device from vibrating.

また％　１枚のカム内に、キャリアとバランサ２ケ所の
カムローラを実務できるので、カムは１枚で済みカムロ
ーラの保持部も小さく設ｇｆできる。Furthermore, since the cam rollers can be installed in two places, a carrier and a balancer, in one cam, only one cam is required, and the cam roller holding section can be made smaller.

〔発明の効果〕〔Effect of the invention〕

本発明は以上説明したように、円筒の端面をカム面にし
、１８０＠位相がずれた位置にカムロー２を設け、その
変位曲線に等速部を設けることによυ、印字品質が良好
で振動の少ない、カム機構がコンパクトなラインプリン
タを提供できるという効果がある。As explained above, the present invention makes the end face of the cylinder a cam surface, provides the cam low 2 at a position 180@ out of phase, and provides a constant velocity part in its displacement curve, thereby achieving good printing quality and vibration. This has the effect of providing a line printer with a compact cam mechanism and less noise.

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

第１図は本発明の実施例を上面より見た図、第２図は本
実施例を前面より見た図である。 ｌ・・・・・・プリントハンマ、２・・・・・・キャリ
ア、３・・・・・・ガイドシャフト、４・・・・・・バ
ラ／す、５．５′・・・・・・カムローラ（キャリア部
）、６．　６’・・・・・・カムローラ（バランサ部）
、７・・・・・・カム、８・・・・・・軸受、９・・・
・・・カムブロック、１０・・・・・・モータ。FIG. 1 is a top view of an embodiment of the present invention, and FIG. 2 is a front view of this embodiment. l...Print hammer, 2...Carrier, 3...Guide shaft, 4...Rose/su, 5.5'... Cam roller (carrier part), 6. 6'...Cam roller (balancer part)
, 7...cam, 8...bearing, 9...
...Cam block, 10...Motor.

Claims (1)

【特許請求の範囲】[Claims] 　等速部をもち、１８０゜で位相が対称になるような変
位曲線を走行面として円筒の両端面に生成したカムと、
そのカムをはさみ込む２ヶのローラからなるカムフォロ
ワー部がプリントハンマを塔載したキャリア部及びキャ
リア部と同じ質量を持つバランサー部の２ヶ所に設けら
れ、カムの回転軸に対して対称な位置に配置されている
ことを特徴とするラインプリンタのハンマ揺動機構。A cam that has a constant velocity part and has a displacement curve that is symmetrical in phase at 180 degrees as a running surface on both end faces of a cylinder,
A cam follower section consisting of two rollers that sandwich the cam is provided at two locations: a carrier section on which the print hammer is mounted, and a balancer section that has the same mass as the carrier section, and is located symmetrically with respect to the rotation axis of the cam. A hammer swing mechanism for a line printer, characterized in that the hammer swing mechanism is arranged in a line printer.