JP2005069458A - Resin-made double helical gear, gear train, and ink jet printer - Google Patents

Resin-made double helical gear, gear train, and ink jet printer Download PDF

Info

Publication number
JP2005069458A
JP2005069458A JP2003329440A JP2003329440A JP2005069458A JP 2005069458 A JP2005069458 A JP 2005069458A JP 2003329440 A JP2003329440 A JP 2003329440A JP 2003329440 A JP2003329440 A JP 2003329440A JP 2005069458 A JP2005069458 A JP 2005069458A
Authority
JP
Japan
Prior art keywords
gear
idle
resin
idle gear
output
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.)
Granted
Application number
JP2003329440A
Other languages
Japanese (ja)
Other versions
JP4518371B2 (en
JP2005069458A5 (en
Inventor
Toru Hagiwara
徹 萩原
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.)
Enplas Corp
Original Assignee
Enplas Corp
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 Enplas Corp filed Critical Enplas Corp
Priority to JP2003329440A priority Critical patent/JP4518371B2/en
Priority to US10/910,929 priority patent/US7415907B2/en
Publication of JP2005069458A publication Critical patent/JP2005069458A/en
Publication of JP2005069458A5 publication Critical patent/JP2005069458A5/ja
Priority to US12/175,118 priority patent/US7770484B2/en
Application granted granted Critical
Publication of JP4518371B2 publication Critical patent/JP4518371B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Abstract

<P>PROBLEM TO BE SOLVED: To reduce operation noise of an ink jet printer and reduce vibration when operating. <P>SOLUTION: This gear train 2 of the ink jet printer 1 is provided with an output gear 5 of a motor 3, a first idle gear 6 meshing with the output gear 5, a second idle gear 7 turning integrally with the first idle gear 6, and a driven gear 8 attached to a roller shaft 13 to turn integrally and meshing with the second idle gear 7. The output gear 5 and the first idle gear 6 are resin-made double helical gears, and the second idle gear 7 and the driven gear 8 are spur gears. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

この発明は、樹脂製やまば歯車、及びこれを使用したギヤトレインやインクジェットプリンタに関するものである。   The present invention relates to a resin-made helical gear, and a gear train and an ink jet printer using the same.

インクジェットプリンタは、その多くがパソコンに接続されて使用され、パソコン操作用のデスク上又はそのデスク近傍に配置され、パソコン操作する者の近くで作動させられる。そのため、インクジェットプリンタは、特に作動音や作動時の振動を小さく抑えることが望まれている。   Most of the ink jet printers are used by being connected to a personal computer, arranged on or near the desk for operating the personal computer, and operated near the person who operates the personal computer. Therefore, it is desired that the ink jet printer particularly suppresses the operating noise and vibration during operation.

そこで、従来のインクジェットプリンタは、モータの出力ギヤ及びこの出力ギヤに噛み合うアイドルギヤをはすば歯車とし、出力ギヤとアイドルギヤとのかみ合い率を大きくすることにより、低騒音化を図っていた（例えば、非特許文献１参照）。そして、ローラ軸の被動ギヤとこれに噛み合うアイドルギヤは、平歯車を使用するようになっており、ローラ軸にスラスト力が作用しないように工夫されていた。なお、ローラ軸にスラスト力が作用すると、搬送ローラがローラ軸の軸線方向に沿ってずれ動きを生じることになる。そして、この搬送ローラによって搬送されるシート（コピー用紙やはがき等のシート状の記録材）がローラ軸の軸線方向にずれて搬送されることになり、印字開始位置等に狂いを生じ、印刷精度が低下することになる。   Therefore, in the conventional inkjet printer, the helical gear is used as the output gear of the motor and the idle gear meshing with the output gear, and the engagement ratio between the output gear and the idle gear is increased to reduce noise ( For example, refer nonpatent literature 1). A spur gear is used for the driven gear of the roller shaft and the idle gear meshing with the driven gear, and it has been devised so that a thrust force does not act on the roller shaft. When a thrust force is applied to the roller shaft, the transport roller is displaced along the axial direction of the roller shaft. Then, the sheet (sheet-like recording material such as copy paper or postcard) conveyed by the conveyance roller is conveyed while being shifted in the axial direction of the roller shaft, resulting in an error in the print start position, etc. Will drop.

精密工学会成形プラスチック歯車研究専門委員会編，「成形プラスチック歯車ハンドブック」，シグマ出版，１９９５年４月２０日，４７７頁及び２０頁Edited by Japan Society for Precision Engineering, Molded Plastic Gear Research Committee, “Molded Plastic Gear Handbook”, Sigma Publishing, April 20, 1995, pages 477 and 20

しかしながら、従来技術のように、出力ギヤとこれに噛み合うアイドルギヤとがはすば歯車であると、両ギヤにスラスト力が作用することになり、両ギヤやこの両ギヤを回動可能に支持している回転軸の取付部のがたつきに起因する振動を生じる場合があった。   However, as in the prior art, if the output gear and the idle gear that meshes with it are helical gears, a thrust force acts on both gears, and both gears and both gears are supported rotatably. In some cases, vibration due to rattling of the mounting portion of the rotating shaft is generated.

そこで、本発明は、パソコン操作する者等の近傍に配置されるインクジェットプリンタの作動音の静粛化及び作動時の振動を低減することを目的とする。   Accordingly, an object of the present invention is to reduce the noise of the operation of an ink jet printer disposed near a person who operates a personal computer or the like and to reduce vibration during operation.

請求項１の発明は、ねじれが反対のはすば歯車を貼り合わせたような形状を呈し、歯幅方向略中央部から歯幅方向一端側の第１歯車部分と歯幅方向略中央部から歯幅方向他端側の第２歯車部分とを一体成形してなることを特徴とする樹脂製やまば歯車である。   The invention of claim 1 is shaped like a helical gear having opposite torsion bonded to each other, from the first gear portion on the one end side in the tooth width direction from the substantially central portion in the tooth width direction and the substantially central portion in the tooth width direction. A resin-made spur gear formed by integrally molding a second gear portion on the other end side in the tooth width direction.

請求項２の発明は、モータの出力ギヤと、この出力ギヤに噛み合う第１アイドルギヤと、この第１アイドルギヤと一体に回動する第２アイドルギヤと、ローラ軸に一体回動できるように取り付けられて前記第２アイドルギヤに噛み合う被動ギヤと、を備えたインクジェットプリンタのギヤトレインに関するものである。そして、前記出力ギヤと前記第１アイドルギヤを樹脂製やまば歯車とし、前記第２アイドルギヤと前記被動ギヤを平歯車としたことを特徴としている。   According to a second aspect of the invention, an output gear of the motor, a first idle gear meshing with the output gear, a second idle gear that rotates integrally with the first idle gear, and a roller shaft can be integrally rotated. The present invention relates to a gear train for an ink jet printer including a driven gear that is attached and meshes with the second idle gear. The output gear and the first idle gear are resin-made helical gears, and the second idle gear and the driven gear are spur gears.

請求項３の発明は、モータの出力ギヤと、この出力ギヤに噛み合う第１アイドルギヤと、この第１アイドルギヤと一体に回動する第２アイドルギヤと、ローラ軸に一体回動できるように取り付けられて前記第２アイドルギヤに噛み合う被動ギヤと、を備えたインクジェットプリンタに関するものである。そして、このインクジェットプリンタは、前記出力ギヤと前記第１アイドルギヤを樹脂製やまば歯車とし、前記第２アイドルギヤと前記被動ギヤを平歯車としたことを特徴としている。   According to a third aspect of the invention, the output gear of the motor, the first idle gear meshing with the output gear, the second idle gear that rotates integrally with the first idle gear, and the roller shaft can be integrally rotated. The present invention relates to an inkjet printer including a driven gear that is attached and meshes with the second idle gear. The ink jet printer is characterized in that the output gear and the first idle gear are resin spur gears, and the second idle gear and the driven gear are spur gears.

以上のように、本発明は、モータの出力ギヤとこれに噛み合う第１アイドルギヤを樹脂製のやまば歯車とし、動力伝達時にスラスト力が生じないようにして、スラスト力が作用することに起因する騒音及び振動を低減することができる。   As described above, the present invention is due to the fact that the thrust force acts so that the first idle gear meshing with the motor output gear is a resin-made spur gear and no thrust force is generated during power transmission. Noise and vibration can be reduced.

また、本発明は、ローラ軸に動力を伝達する第２アイドルギヤと被動ギヤが平歯車であるため、第２アイドルギヤと被動ギヤとの動力伝達時にスラスト力が作用するようなことがなく、搬送ローラがローラ軸に沿ってずれ動くようなことがない。   In the present invention, since the second idle gear and the driven gear that transmit power to the roller shaft are spur gears, a thrust force does not act when power is transmitted between the second idle gear and the driven gear. The transport roller does not move along the roller axis.

以下、本発明の実施の形態を図面に基づき詳述する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

（インクジェットプリンタのギヤトレイン）
図１は、本発明の実施の形態に係るインクジェットプリンタ１のギヤトレイン２を示す模式的構成図である。この図に示すように、本実施の形態に係るインクジェットプリンタ１のギヤトレイン２は、モータ３の出力軸４に固定された出力ギヤ５と、この出力ギヤ５に噛み合う第１アイドルギヤ６と、この第１アイドルギヤ６と一体に回動する第２アイドルギヤ７と、この第２アイドルギヤ７と噛み合う被動ギヤ８と、を備えている。そして、少なくとも、出力ギヤ５と第１アイドルギヤ６は、ポリアセタール，ポリアミド，ポリカーボネート，ＡＢＳ樹脂等の各種プラスチック材料を高精度に射出成形した樹脂ギヤが使用される。 (Inkjet printer gear train)
FIG. 1 is a schematic configuration diagram showing a gear train 2 of an ink jet printer 1 according to an embodiment of the present invention. As shown in this figure, the gear train 2 of the ink jet printer 1 according to the present embodiment includes an output gear 5 fixed to the output shaft 4 of the motor 3, a first idle gear 6 meshing with the output gear 5, A second idle gear 7 that rotates integrally with the first idle gear 6 and a driven gear 8 that meshes with the second idle gear 7 are provided. At least the output gear 5 and the first idle gear 6 are resin gears made by injection molding various plastic materials such as polyacetal, polyamide, polycarbonate and ABS resin with high accuracy.

第１アイドルギヤ６及び第２アイドルギヤ７は、プリンタ本体１０のフレーム１１に回動可能に支持された軸１２に固定されており、軸１２と共に一体回動するようになっている。尚、第１アイドルギヤ６と第２アイドルギヤ７とを一体化し、第１アイドルギヤ６と第２アイドルギヤ７とをフレーム１１に固定した軸１２に対して回動できるように構成してもよい。   The first idle gear 6 and the second idle gear 7 are fixed to a shaft 12 that is rotatably supported by the frame 11 of the printer main body 10, and rotates together with the shaft 12. The first idle gear 6 and the second idle gear 7 may be integrated so that the first idle gear 6 and the second idle gear 7 can be rotated with respect to the shaft 12 fixed to the frame 11. Good.

第２アイドルギヤ７と噛み合う被動ギヤ８は、ローラ軸１３に固定されており、第２アイドルギヤ７によって回転させられることにより、ローラ軸１３と一体に回動し、搬送ローラ１４によるシート給送を可能にする。   The driven gear 8 that meshes with the second idle gear 7 is fixed to the roller shaft 13, and is rotated integrally with the roller shaft 13 by being rotated by the second idle gear 7, so that the sheet is fed by the conveying roller 14. Enable.

このような本実施の形態に係るギヤトレイン２は、出力ギヤ５とこれに噛み合う第１アイドルギヤ６をやまば歯車とし、第２アイドルギヤ７とこれに噛み合う被動ギヤ８を平歯車としている。   In such a gear train 2 according to the present embodiment, the output gear 5 and the first idle gear 6 that meshes with the output gear 5 are helical gears, and the second idle gear 7 and the driven gear 8 that meshes with them are spur gears.

このようなインクジェットプリンタ１のギヤトレイン２は、出力ギヤ５から第１アイドルギヤ６にモータ３の回転が伝達される際に、出力ギヤ５及び第１アイドルギヤ６にスラスト力が作用しない。したがって、本実施の形態によれば、スラスト力が作用することに起因するがたつき音（作動音）が静粛化し、振動が低減される。また、第２アイドルギヤ７と被動ギヤ８とが平歯車であるため、ローラ軸１３にスラスト力が作用することがなく、搬送ローラ１４が所定の位置で回動し続けことができ、正確なシート搬送が可能になる。その結果、本実施の形態のギヤトレイン２を使用するインクジェットプリンタ１は、画像形成精度（例えば、印字精度）が向上する。   In the gear train 2 of the ink jet printer 1, when the rotation of the motor 3 is transmitted from the output gear 5 to the first idle gear 6, no thrust force acts on the output gear 5 and the first idle gear 6. Therefore, according to the present embodiment, the rattling noise (operating noise) caused by the thrust force acting is silenced and the vibration is reduced. In addition, since the second idle gear 7 and the driven gear 8 are spur gears, the thrust force does not act on the roller shaft 13, and the transport roller 14 can continue to rotate at a predetermined position. Sheet conveyance becomes possible. As a result, the ink jet printer 1 using the gear train 2 of the present embodiment improves the image forming accuracy (for example, printing accuracy).

（インクジェットプリンタ）
ここで、本実施の形態に係るギヤトレイン２を使用したインクジェットプリンタ１は、給紙カセットから給紙コロによって送り出されたシートをギヤトレイン２によって駆動される搬送ローラ１４によって画像形成部に送り込み、この画像形成部においてインクが吹き付けられて画像が形成され（印字され）、その後、排紙トレイ側へ排出されるようになっている。 (Inkjet printer)
Here, the ink jet printer 1 using the gear train 2 according to the present embodiment sends the sheet fed from the sheet feeding cassette by the sheet feeding roller to the image forming unit by the conveying roller 14 driven by the gear train 2, In this image forming section, ink is sprayed to form an image (printed), and then discharged to the discharge tray side.

（樹脂製やまば歯車）
図２は、本実施の形態に係るギヤトレイン２の一部を構成する第１アイドルギヤ６としての樹脂製やまば歯車２０を示すものである。この図２に示す樹脂製やまば歯車２０は、ウェブ２１の側面に第２アイドルギヤ７としての平歯車が一体形成されている。このように、平歯車（７）が一体に形成された樹脂製やまば歯車２０は、樹脂（ポリアセタールやポリカーボネート等）を使用して射出成形されたものであり、多数の歯２２が形成された外周側のリム２３と軸穴２４を備えた内周側のボス２５とを略円板状のウェブ２１で接続するようになっている。そして、この樹脂製やまば歯車２０のウェブ２１の一方の側面２６側に延出するボス２７の外周には歯２８が多数形成されており、この外周に多数の歯２８を備えたボス２７が第２アイドルギヤ７としての平歯車を構成する。なお、平歯車（７）を構成するボス２７には、軸穴２４と同心の筒状の肉抜き穴３０が平歯車（７）の歯幅寸法とほぼ同一寸法の深さまで形成されている。このように、肉抜き穴３０を形成することにより、平歯車（７）と他部との肉厚の均一化を図り、平歯車（７）と他部との射出成形後の冷却速度の均一化を図ることができ、平歯車（７）と他部との収縮率を均一化して、平歯車（７）の歯２８の精度を向上させることが可能となる。 (Plastic bevel gear)
FIG. 2 shows a resin helical gear 20 as the first idle gear 6 constituting a part of the gear train 2 according to the present embodiment. The spur gear 20 made of resin shown in FIG. 2 is integrally formed with a spur gear as the second idle gear 7 on the side surface of the web 21. As described above, the resin spur gear 20 integrally formed with the spur gear (7) is injection-molded using a resin (polyacetal, polycarbonate, etc.), and a large number of teeth 22 are formed. The rim 23 on the outer peripheral side and the boss 25 on the inner peripheral side provided with the shaft hole 24 are connected by a substantially disc-shaped web 21. A large number of teeth 28 are formed on the outer periphery of the boss 27 extending toward the one side 26 of the web 21 of the resin spur gear 20, and the boss 27 having a large number of teeth 28 is formed on the outer periphery. A spur gear as the second idle gear 7 is configured. The boss 27 constituting the spur gear (7) is formed with a cylindrical hollow hole 30 concentric with the shaft hole 24 to a depth substantially the same as the tooth width dimension of the spur gear (7). Thus, by forming the hollow hole 30, the thickness of the spur gear (7) and the other part is made uniform, and the cooling rate after injection molding of the spur gear (7) and the other part is uniform. It is possible to improve the accuracy of the teeth 28 of the spur gear (7) by making the contraction rate between the spur gear (7) and the other part uniform.

樹脂製やまば歯車２０の歯２２の平面形状は、図２乃至図３に示すように、ねじれが反対のはすば歯車を貼り合わせたような形状を呈している。そして、この樹脂製やまば歯車２０は、歯幅方向略中央部の山形の頂部３１から歯幅方向一端側の第１歯車部分３２を形作る第１金型３３と、歯幅方向略中央部の山形の頂部３１から歯幅方向他端側の第２歯車部分３４及び平歯車（７）を形作る第２金型３５とを突き合わせ、これら第１金型３３と第２金型３５のキャビティ３６ａ，３６ｂ内に樹脂を射出して一体成形されるようになっている。   As shown in FIGS. 2 to 3, the planar shape of the teeth 22 of the resin helical gear 20 is a shape in which helical gears having opposite torsion are bonded together. The resin blind gear 20 includes a first mold 33 that forms a first gear portion 32 on one end side in the tooth width direction from a chevron-shaped top portion 31 at a substantially central part in the tooth width direction, and a substantially central part in the tooth width direction. The second mold 35 that forms the second gear portion 34 and the spur gear (7) on the other end side in the tooth width direction from the top 31 of the chevron is abutted, and the first mold 33 and the cavity 36a of the second mold 35, A resin is injected into 36b and integrally molded.

このようにして射出成形された樹脂製やまば歯車２０は、第１金型３３と第２金型３５の突き合わせ面３７がズレを生じると、図３に示すように、第１歯車部分３２と第２歯車部分３４の歯２２の接続部もズレを生じ、山形の歯２２の頂部３１及びその裏面部３８にズレに起因する段差δが生じる。しかし、本実施の形態においては、射出成形用金型（第１金型３３と第２金型３５）の構造等を工夫することにより、歯２２の段差δを極めて小さくすることができ、やまば歯車としての特性を損なうことがない（スラストを生じることがない）動力伝達を可能にしている。   As shown in FIG. 3, when the resin-made spur gear 20 thus injection-molded is displaced between the butted surfaces 37 of the first mold 33 and the second mold 35, The connecting portion of the teeth 22 of the second gear portion 34 is also displaced, and a step δ caused by the displacement is generated at the top 31 of the chevron teeth 22 and the back surface 38 thereof. However, in the present embodiment, the step δ of the tooth 22 can be made extremely small by devising the structure of the injection mold (the first mold 33 and the second mold 35). Thus, power transmission is possible without impairing the characteristics as a gear (no thrust is generated).

すなわち、図４（ａ），（ｃ）に示すように、極めて小さな段差δの出っ張り部分（斜線部）４０は、動力伝達時において、噛み合う相手の樹脂製やまば歯車（出力ギヤ５）の歯４１と局所的に接触することになり、伝達すべき荷重が極めて小さな接触面積部分に集中して作用することになるため、弾性変形又は塑性変形してつぶれ、その変形に伴う余肉が歯先面側のスペースや歯底面側のスペース又は相手歯車の歯面との間に生じるスペース内に逃げることになる。その結果、噛み合う両歯車（５，２０）の第１歯車部分４２，３２と第２歯車部分４３、３４の歯４１，２２同士が接触した状態で（二面接触状態で）回転伝達を行うことができ、動力伝達時にスラストを生じることがない。   That is, as shown in FIGS. 4 (a) and 4 (c), the protruding portion (shaded portion) 40 of the extremely small step δ is a tooth of the mating resin spur gear (output gear 5) that engages during power transmission. 41, and the load to be transmitted acts in a concentrated manner on the contact area, so that it collapses due to elastic deformation or plastic deformation. It escapes in the space formed between the space on the surface side, the space on the tooth bottom side, or the tooth surface of the mating gear. As a result, rotation transmission is performed in a state where the first gear portions 42 and 32 of the meshing gears (5 and 20) and the teeth 41 and 22 of the second gear portions 43 and 34 are in contact with each other (in a two-surface contact state). And no thrust is generated during power transmission.

なお、図４（ａ）は、段差の無い樹脂製やまば歯車（出力ギヤ５）の歯４１と段差の有る樹脂製やまば歯車２０（第１アイドルギヤ６）の歯２２の噛み合い状態を示す平面図である。この図４（ａ）に示す状態においては、極めて小さな段差の出っ張り部分４０が伝達荷重でつぶされ、その変形した余肉が歯先面側又は歯底面側のスペースに逃げることになる。   FIG. 4A shows a state in which the teeth 41 of the resin-made blind gear (output gear 5) without a step and the teeth 22 of the resin-made blind gear 20 (the first idle gear 6) having a step are engaged. It is a top view. In the state shown in FIG. 4A, the protruding portion 40 having a very small step is crushed by the transmission load, and the deformed surplus portion escapes to the space on the tooth tip surface side or the tooth bottom surface side.

また、図４（ｂ）は、噛み合う両樹脂製やまば歯車（出力ギヤ５と第１アイドルギヤ６）の歯４１，２２が同一の形状（図３に示す段差δが同一に形成された形状）の場合の噛み合い状態を示す歯４１，２２の平面図である。この図４（ｂ）に示す状態においては、噛み合う歯面の一方の段差の凹み部分４４と他方の段差の出っ張り部分４０とがはまり合うため、段差δ（図３参照）の出っ張り部分４０がつぶされることなく、噛み合う両歯車（５，２０）の第１歯車部分４２，３２と第２歯車部分４３，３４の歯４１，２２同士が接触することになる。   FIG. 4B shows a shape in which the teeth 41 and 22 of the meshed splint gears (the output gear 5 and the first idle gear 6) have the same shape (the step δ shown in FIG. 3 is the same). ) Is a plan view of the teeth 41 and 22 showing the meshing state in the case of. In the state shown in FIG. 4 (b), the recessed portion 44 of one step of the engaging tooth surfaces and the protruding portion 40 of the other step are fitted together, so that the protruding portion 40 of the step δ (see FIG. 3) is crushed. Therefore, the teeth 41 and 22 of the first gear portions 42 and 32 and the second gear portions 43 and 34 of the meshing gears (5 and 20) come into contact with each other.

また、図４（ｃ）は、噛み合う相手樹脂製やまば歯車（出力ギヤ５）のズレ（段差）が樹脂製やまば歯車２０（第１アイドルギヤ６）のズレ（段差）と逆の形状に形成された場合の噛み合い状態を示す歯４１，２２の平面図である。この図４（ｃ）に示す状態においては、第１アイドルギヤ６側の極めて小さな段差の出っ張り部分４０が伝達荷重でつぶされて、その変形の余肉が歯先面側のスペース，歯底面側のスペース又は出力ギヤ５側の段差の凹み部分４４に逃げることになる。   FIG. 4 (c) shows a shape in which the displacement (step) of the mating resin spur gear (output gear 5) is opposite to that of the resin spur gear 20 (first idle gear 6). It is a top view of the teeth 41 and 22 which shows the meshing state at the time of being formed. In the state shown in FIG. 4C, the protruding portion 40 having an extremely small step on the first idle gear 6 side is crushed by the transmission load, and the deformation surplus is the space on the tooth tip surface side, the tooth bottom surface side. Or escape to the recessed portion 44 of the step on the output gear 5 side.

このような構成の樹脂製やまば歯車２０によれば、スラストを生じることなく、静粛に且つ大きなトルクを伝達することが可能になる。   According to the resin splint gear 20 having such a configuration, it is possible to transmit a large torque silently without generating a thrust.

また、本実施の形態の樹脂製やまば歯車２０は、第２アイドルギヤ７としての平歯車が一体に形成されているため、歯車の点数を削減でき、ギヤトレイン２の組立工数を削減できると共に、ギヤトレイン２の価格の低廉化を図ることができる。   In addition, since the spur gear 20 as the second idle gear 7 is formed integrally with the resin blind gear 20 of the present embodiment, the number of gears can be reduced, and the number of assembling steps of the gear train 2 can be reduced. The price of the gear train 2 can be reduced.

また、本実施の形態の樹脂製やまば歯車２０を金属製のやまば歯車に代えて使用するようにすれば、ギヤトレイン２の軽量化を図ることができる。   Moreover, if the resin-made blind gear 20 of this Embodiment is used instead of a metal-made blind gear, the gear train 2 can be reduced in weight.

また、本実施の形態の樹脂製やまば歯車は、スラストを生じないため、その分だけ樹脂製はすば歯車に比較してウェブの肉厚を薄くすることができ、放射状リブを省略することも可能になる。   Further, since the resin-made helical gear according to the present embodiment does not generate thrust, the thickness of the web can be made thinner than that of the resin-made helical gear, and the radial ribs can be omitted. Is also possible.

なお、本実施の形態の樹脂製やまば歯車２０は、図７に示すように、平歯車（第２アイドルギヤ７）との複合歯車とせずに、第１アイドルギヤ６のみを形成したものでもよい。このように形成した樹脂製やまば歯車２０は、噛み合う出力ギヤ５及び第１アイドルギヤ６として使用することができる。   In addition, as shown in FIG. 7, the resin-made helical gear 20 of the present embodiment is not a compound gear with a spur gear (second idle gear 7), but only the first idle gear 6 is formed. Good. The plastic blind gear 20 formed in this way can be used as the meshing output gear 5 and first idle gear 6.

また、本実施の形態の樹脂製やまば歯車２０は、図２に示したように、大径部分を第１アイドルギヤ６とし、小径部分を第２アイドルギヤ７としたが、これに限られず、ギヤトレイン２の回転伝達比等に応じて、適宜外径寸法等を変えることができる。   Further, as shown in FIG. 2, the resin-made helical gear 20 of the present embodiment has the large-diameter portion as the first idle gear 6 and the small-diameter portion as the second idle gear 7, but is not limited thereto. Depending on the rotation transmission ratio of the gear train 2 and the like, the outer diameter and the like can be appropriately changed.

図５は、上述の実施の形態の第１変形例を示す図であり、噛み合う相手の樹脂製やまば歯車（出力ギヤ５）の歯４１のねじれ角を樹脂製やまば歯車２０（第１アイドルギヤ６）の歯２２のねじれ角よりも大きくしてある。すなわち、噛み合う相手の樹脂製やまば歯車（出力ギヤ５）のねじれ角は、第１アイドルギヤ６側の段差に出力ギヤ５の歯面４５ａ，４５ｂが接触せずに、出力ギヤ５側の第１歯車部分４２と第２歯車部分４３の歯面４５ａ，４５ｂの歯幅方向両側端部側が第１アイドルギヤ６の第１歯車部分３２と第２歯車部分３４に接触するように、その大きさを決定している。   FIG. 5 is a diagram showing a first modification of the above-described embodiment, in which the torsion angle of the teeth 41 of the mating resin-made spur gear (output gear 5) is set to the resin-made spur gear 20 (first idle gear). It is larger than the twist angle of the teeth 22 of the gear 6). In other words, the torsion angle of the mating plastic spur gear (output gear 5) is such that the tooth surfaces 45a and 45b of the output gear 5 do not contact the step on the first idle gear 6 side, and the first gear on the output gear 5 side. The sizes of the tooth surfaces 45a and 45b of the first gear portion 42 and the second gear portion 43 are such that both end portions in the tooth width direction are in contact with the first gear portion 32 and the second gear portion 34 of the first idle gear 6. Is determined.

なお、図５（ａ）は、段差δ（図３参照）を生じた樹脂製やまば歯車２０（第１アイドルギヤ６）に対し、噛み合う相手の樹脂製やまば歯車（出力ギヤ５）が段差を生じない場合の噛み合い状態を示す歯４１，２２の平面図である。また、図５（ｂ）は、噛み合う両歯車（５，２０）が同一形状の段差を生じた場合の噛み合い状態を示す歯４１，２２の平面図である。また、図５（ｃ）は、噛み合う相手樹脂製やまば歯車（出力ギヤ５）のズレ（段差）が樹脂製やまば歯車２０（第１アイドルギヤ６）のズレ（段差）と逆の形状に形成された場合の噛み合い状態を示す歯４１，２２の平面図である。このような、いずれの状態においても、本実施例によれば、両歯車（５，２０）の第１歯車部分４２，３２と第２歯車部分４３，３４同士が接触し、スラストを生じることなく動力伝達することが可能になる。   FIG. 5A shows a step where the mating resin spur gear (output gear 5) meshes with the plastic spur gear 20 (first idle gear 6) that has a step δ (see FIG. 3). It is a top view of the teeth 41 and 22 which shows the meshing state when not producing. FIG. 5B is a plan view of the teeth 41 and 22 showing the meshing state when the meshing gears (5, 20) have a step having the same shape. FIG. 5 (c) shows that the displacement (step) of the mating resin spur gear (output gear 5) is opposite to that of the resin spur gear 20 (first idle gear 6). It is a top view of the teeth 41 and 22 which shows the meshing state at the time of being formed. In any of these states, according to the present embodiment, the first gear portions 42 and 32 and the second gear portions 43 and 34 of both gears (5, 20) are in contact with each other without causing thrust. It is possible to transmit power.

図６は、実施例１の変形例（上述の実施の形態の第２変形例）を示す図であり、出力ギヤ５の第１歯車部分４２と第２歯車部分４３を第１アイドルギヤ６側に向けて凸形状になるように湾曲させてある。このように、噛み合う相手の樹脂製やまば歯車（出力ギヤ５）の歯４１を形成することにより、出力ギヤ５の第１歯車部分４２と第２歯車部分４３の歯４１の中央部分を第１アイドルギヤ６の歯２２に接触させることができ、スラストを生じることなく動力伝達することが可能になる。   FIG. 6 is a view showing a modification of the first embodiment (second modification of the above-described embodiment), in which the first gear portion 42 and the second gear portion 43 of the output gear 5 are connected to the first idle gear 6 side. It is curved so as to have a convex shape toward the surface. In this way, by forming the teeth 41 of the mating plastic spur gear (output gear 5) to be engaged, the first gear portion 42 of the output gear 5 and the central portion of the teeth 41 of the second gear portion 43 are the first. The teeth 22 of the idle gear 6 can be brought into contact with each other, and power can be transmitted without generating thrust.

この発明の樹脂製やまば歯車は、上述したインクジェットプリンタの他に、複写機，ファクシミリ装置，レーザープリンタ等の各種ＯＡ機器、ワイパー駆動装置，パワーウインド駆動装置，オートスライドドア駆動装置等の各種自動車部品、各種電子機器、精密機械等に広く使用される。   In addition to the above-described ink jet printer, the resin splint gear of the present invention includes various OA devices such as copying machines, facsimile machines, and laser printers, various automobiles such as wiper driving devices, power window driving devices, and automatic sliding door driving devices. Widely used in parts, various electronic devices, precision machines, etc.

本発明の実施の形態に係るインクジェットプリンタのギヤトレインを示す模式的構成図である。It is a typical block diagram which shows the gear train of the inkjet printer which concerns on embodiment of this invention.

本発明の実施の形態に係る樹脂製やまば歯車であって、上側半分を断面して示す樹脂製やまば歯車を示す図である。FIG. 3 is a diagram showing a resin-made spur gear according to an embodiment of the present invention, the resin-made spur gear shown by cross-sectioning the upper half.

図２の樹脂製やまば歯車の歯の平面図である。It is a top view of the tooth | gear of the resin made blind gear of FIG.

本発明の実施の形態に係る出力ギヤと第１アイドルギヤとの噛み合い状態を示す歯の平面図である。It is a top view of the tooth | gear which shows the meshing state of the output gear and 1st idle gear which concern on embodiment of this invention.

本発明の実施例１に係る出力ギヤと第１アイドルギヤとの噛み合い状態を示す歯の平面図である。It is a top view of the tooth | gear which shows the meshing state of the output gear and 1st idle gear which concern on Example 1 of this invention.

本発明の実施例２に係る出力ギヤと第１アイドルギヤとの噛み合い状態を示す歯の平面図である。It is a top view of the tooth | gear which shows the meshing state of the output gear and 1st idle gear which concern on Example 2 of this invention.

本発明の実施の形態に係る樹脂製やまば歯車の変形例を示す図であり、上半分を断面して示す図である。It is a figure which shows the modification of the resin-made helical gear which concerns on embodiment of this invention, and is a figure which shows the upper half in cross section.

符号の説明Explanation of symbols

１……インクジェットプリンタ、２……ギヤトレイン、３……モータ、５……出力ギヤ、６……第１アイドルギヤ、７……第２アイドルギヤ、８……被動ギヤ、１３……ローラ軸、２０……樹脂製やまば歯車、３２……第１歯車部分、３４……第２歯車部分   DESCRIPTION OF SYMBOLS 1 ... Inkjet printer, 2 ... Gear train, 3 ... Motor, 5 ... Output gear, 6 ... 1st idle gear, 7 ... 2nd idle gear, 8 ... Driven gear, 13 ... Roller shaft , 20 ... Resin made helical gear, 32 ... 1st gear part, 34 ... 2nd gear part

Claims (3)

ねじれが反対のはすば歯車を貼り合わせたような形状を呈し、
歯幅方向略中央部から歯幅方向一端側の第１歯車部分と歯幅方向略中央部から歯幅方向他端側の第２歯車部分とを一体成形してなることを特徴とする樹脂製やまば歯車。 It is shaped like a helical gear with opposite torsion,
A resin product, wherein the first gear portion on one end side in the tooth width direction from the substantially central portion in the tooth width direction and the second gear portion on the other end side in the tooth width direction from the substantially central portion in the tooth width direction are integrally formed. Coiled gears. モータの出力ギヤと、この出力ギヤに噛み合う第１アイドルギヤと、この第１アイドルギヤと一体に回動する第２アイドルギヤと、ローラ軸に一体回動できるように取り付けられて前記第２アイドルギヤに噛み合う被動ギヤと、を備え、
前記出力ギヤと前記第１アイドルギヤを樹脂製やまば歯車とし、前記第２アイドルギヤと前記被動ギヤを平歯車としたことを特徴とするギヤトレイン。 An output gear of the motor, a first idle gear that meshes with the output gear, a second idle gear that rotates integrally with the first idle gear, and the second idle gear that is attached to the roller shaft so as to rotate integrally. A driven gear meshing with the gear,
A gear train characterized in that the output gear and the first idle gear are resin helical gears, and the second idle gear and the driven gear are spur gears. モータの出力ギヤと、この出力ギヤに噛み合う第１アイドルギヤと、この第１アイドルギヤと一体に回動する第２アイドルギヤと、ローラ軸に一体回動できるように取り付けられて前記第２アイドルギヤに噛み合う被動ギヤと、を備え、
前記出力ギヤと前記第１アイドルギヤを樹脂製やまば歯車とし、前記第２アイドルギヤと前記被動ギヤを平歯車としたことを特徴とするインクジェットプリンタ。 An output gear of the motor, a first idle gear that meshes with the output gear, a second idle gear that rotates integrally with the first idle gear, and the second idle gear that is attached to the roller shaft so as to rotate integrally. A driven gear meshing with the gear,
An ink jet printer characterized in that the output gear and the first idle gear are resin-made helical gears, and the second idle gear and the driven gear are spur gears.
JP2003329440A 2003-08-04 2003-09-22 A pair of plastic spur gears, a gear train, and an ink jet printer Expired - Fee Related JP4518371B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2003329440A JP4518371B2 (en) 2003-08-04 2003-09-22 A pair of plastic spur gears, a gear train, and an ink jet printer
US10/910,929 US7415907B2 (en) 2003-08-04 2004-08-04 Resin double helical gear and gear train using same
US12/175,118 US7770484B2 (en) 2003-08-04 2008-07-17 Resin double helical gear and gear train using same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003205602 2003-08-04
JP2003329440A JP4518371B2 (en) 2003-08-04 2003-09-22 A pair of plastic spur gears, a gear train, and an ink jet printer

Publications (3)

Publication Number Publication Date
JP2005069458A true JP2005069458A (en) 2005-03-17
JP2005069458A5 JP2005069458A5 (en) 2006-11-02
JP4518371B2 JP4518371B2 (en) 2010-08-04

Family

ID=34425065

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003329440A Expired - Fee Related JP4518371B2 (en) 2003-08-04 2003-09-22 A pair of plastic spur gears, a gear train, and an ink jet printer

Country Status (1)

Country Link
JP (1) JP4518371B2 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006327470A (en) * 2005-05-27 2006-12-07 Takata Corp Seat belt retractor and seat belt device using the same
JP2007132436A (en) * 2005-11-10 2007-05-31 Enplas Corp Assembling structure of double helical gear
JP2008101700A (en) * 2006-10-19 2008-05-01 Enplas Corp Pair of resin double helical gears
JP2008144924A (en) * 2006-12-13 2008-06-26 Enplas Corp Pair of resin double helical gears
US8033196B2 (en) 2006-10-19 2011-10-11 Enplas Corporation Resin double helical gear pair
JP2011206990A (en) * 2010-03-29 2011-10-20 Fujifilm Corp Inkjet drawing apparatus, designing method of the same, and method for improving quality of drawing
JP2011236973A (en) * 2010-05-11 2011-11-24 Mitsuba Corp Motor with reduction gear mechanism
US8622503B2 (en) 2010-03-29 2014-01-07 Fujifilm Corporation Inkjet image forming apparatus, method of designing same and method of improving image formation quality
EP3415790A4 (en) * 2016-02-08 2019-08-14 Enplas Corporation Gear device and gear device assembly method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0376663A (en) * 1989-08-21 1991-04-02 Mitsubishi Electric Corp Printer device
JPH10315344A (en) * 1997-02-05 1998-12-02 Micropump Inc Method and device for manufacturing herringbone gear
JP2000046153A (en) * 1998-07-27 2000-02-18 Konica Corp Multistage gear, gearing, and image forming device
JP2002154701A (en) * 2000-11-21 2002-05-28 Canon Inc Sheet carrying device and image forming device and image reader

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0376663A (en) * 1989-08-21 1991-04-02 Mitsubishi Electric Corp Printer device
JPH10315344A (en) * 1997-02-05 1998-12-02 Micropump Inc Method and device for manufacturing herringbone gear
JP2000046153A (en) * 1998-07-27 2000-02-18 Konica Corp Multistage gear, gearing, and image forming device
JP2002154701A (en) * 2000-11-21 2002-05-28 Canon Inc Sheet carrying device and image forming device and image reader

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006327470A (en) * 2005-05-27 2006-12-07 Takata Corp Seat belt retractor and seat belt device using the same
JP4702833B2 (en) * 2005-05-27 2011-06-15 タカタ株式会社 Seat belt retractor and seat belt device using the same
JP2007132436A (en) * 2005-11-10 2007-05-31 Enplas Corp Assembling structure of double helical gear
JP4693604B2 (en) * 2005-11-10 2011-06-01 株式会社エンプラス Assembling structure of the blind gear
JP2008101700A (en) * 2006-10-19 2008-05-01 Enplas Corp Pair of resin double helical gears
JP4697887B2 (en) * 2006-10-19 2011-06-08 株式会社エンプラス A pair of plastic helical gears
US8033196B2 (en) 2006-10-19 2011-10-11 Enplas Corporation Resin double helical gear pair
JP2008144924A (en) * 2006-12-13 2008-06-26 Enplas Corp Pair of resin double helical gears
JP2011206990A (en) * 2010-03-29 2011-10-20 Fujifilm Corp Inkjet drawing apparatus, designing method of the same, and method for improving quality of drawing
US8622503B2 (en) 2010-03-29 2014-01-07 Fujifilm Corporation Inkjet image forming apparatus, method of designing same and method of improving image formation quality
JP2011236973A (en) * 2010-05-11 2011-11-24 Mitsuba Corp Motor with reduction gear mechanism
EP3415790A4 (en) * 2016-02-08 2019-08-14 Enplas Corporation Gear device and gear device assembly method

Also Published As

Publication number Publication date
JP4518371B2 (en) 2010-08-04

Similar Documents

Publication Publication Date Title
US7770484B2 (en) Resin double helical gear and gear train using same
US20090078074A1 (en) Resin Double Helical Gear and Gear Train Using Same
JP4470163B2 (en) Molded plastic gear, intermittent rotation transmission mechanism using the same, and method of using molded plastic gear
JP4868215B2 (en) Electric power steering device
JP4518371B2 (en) A pair of plastic spur gears, a gear train, and an ink jet printer
JP4356485B2 (en) Electric power steering device
JP2005240855A (en) Gear
JP2014034452A (en) Recording device
JP2008221519A (en) Synthetic resin molding and electronic equipment
JP4565593B2 (en) Recording device
JP3885806B2 (en) Thermal transfer printer
JP3807626B2 (en) Gear mechanism of image forming apparatus
JP3824087B2 (en) Thermal transfer printer
JP2009184293A (en) Printer
JP3811951B2 (en) Thermal transfer printer
JP2006282330A (en) Support device of drive shaft, recording device having the same, and liquid injection device
JP2598630B2 (en) How to drive a printer
JP2002046631A (en) Electric power steering device
JPH04157251A (en) Gear device
JP2001208161A (en) Planetary mechanism and recording device
JPH09226975A (en) Paper feed device and printer
WO1998045124A1 (en) Structure for fixing carriage driving member to carriage driving belt in printer
JP2005205831A (en) Recording device
JP2003176055A (en) Roller driving mechanism, and ink jet recording device having it
JP2001088387A (en) Printing head-driving apparatus of serial printer

Legal Events

Date Code Title Description
A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20060919

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20060919

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20090317

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20090319

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20090422

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20091124

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20091209

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20100512

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20100513

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130528

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Ref document number: 4518371

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130528

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140528

Year of fee payment: 4

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees