JP3606303B2

JP3606303B2 - Mounting mechanism for paper feeder

Info

Publication number: JP3606303B2
Application number: JP12219398A
Authority: JP
Inventors: 浩石田
Original assignee: Seiko Epson Corp
Current assignee: Seiko Epson Corp
Priority date: 1998-05-01
Filing date: 1998-05-01
Publication date: 2005-01-05
Anticipated expiration: 2018-05-01
Also published as: JPH11309911A

Description

【０００１】
【発明の属する技術分野】
本発明はトラクタと呼ばれる紙送り装置をプリンタに取り付けるための取付け機構に関する。
【０００２】
【従来の技術】
プリンタ本体に装着し、プーリ軸駆動歯車をプリンタ本体側の駆動歯車に噛合わせて長尺紙を送りようにしたプッシュトラクタもしくはプルトラクタは、通常、図３に示したように、フレーム本体ａに設けたフック部ｂをプリンタ本体の一部ｃに係合するようにして装着するが、このような装着機構では、紙送り動作の際の負荷により、プーリ軸駆動歯車ｄがプリンタ本体側の駆動歯車ｅに対して図に示した接線方向に対し圧力角αをなす方向に変位し、フレーム本体ａ後端の係合片ｃを撓ませるようにして、両歯車ｄ、ｅの軸間距離を拡げる方向に回動変位する結果、これらの間で歯とびを生じさせかねないといった不都合が生じる。
【０００３】
【発明が解決しようとする課題】
本発明はこのような問題に鑑みてなされたもので、その目的とするところは、紙送りの際の負荷により変位しても、歯とびを生じさせることのない紙送り装置の取付け機構を提供することにある。
【０００４】
【課題を解決するための手段】
すなわち、本発明はこのような課題を達成するための紙送り装置の取付け機構として、プリンタ本体に着脱自在に取付けられ、かつ上記プリンタ本体側の駆動歯車と噛合う歯車を備えた紙送り装置の取付け機構として、上記プリンタ本体の上記紙送り装置の装着位置に取付け凹部（４）と、取付けピン（５）とを設け、また上記紙送り装置のフレームには、上記取付け凹部（４）に係合可能な係合片（１２）と、上記歯車の軸心を中心として上記歯車の軸心から取付けピン（５）までの距離と上記取付けピン（５）の直径との和に相当する距離を半径とする円弧状の取付け凹部を形成する係合部（１５）と、上記駆動歯車の軸に係合する取付け凹部（３）とを設けて、上記紙送り装置のフレームの係合片（１２）、取付けピン（５）、及び取付け凹部（３）をそれぞれ上記プリンタの取付け凹部（４）、係合部（１５）の凹部、及び駆動歯車の軸に係合させることにより上記紙送り装置を上記プリンタ本体に装着するようにした。
【０００５】
【発明の実施の形態】
そこで以下に本発明の実施例について説明する。
図１、図２は本発明の一実施例を示したものである。
【０００６】
図中符号１で示したプリンタ本体のサイドフレームには、フレーム本体１１を介してトラクタユニット１０を取り付ける取付け部２が、その両端の取付け凹部３、４に、駆動プーリ軸１３の軸受け１６とフレーム本体１１後端の係合片１２を係合させるようにしてトラクタユニット１０を取付けるように構成され、また、サイドフレーム１の駆動プーリ軸１３側には、その取付け凹部３（円弧）の中心から後述する距離Ｌを隔てた点に取付けピン５が立設されている。
【０００７】
他方、図２に示したように、トラクタユニット１０のフレーム本体１１には、プリンタ本体側に設けた駆動歯車６と噛合って駆動プーリに駆動力を伝えるプーリ軸駆動歯車１４が設けられ、さらに、この駆動プーリ軸１３側には、サイドフレーム１に立設した取付けピン５と係合してフレーム本体１１をサイドフレーム１に止着する係合部１５が設けられている。
【０００８】
この係合部１５には、プーリ軸駆動歯車１４の軸心を中心とする円弧状の内面１５ａが、プーリ軸駆動歯車１４の軸心から取付けピン５までの距離をＤ、取付けピン５の半径をｄとしたときに、プーリ軸駆動歯車１４の軸心からの距離Ｌが、Ｄ＋２ｄとなるような距離をおいて形成されていて、紙送りの際の負荷によってフレーム本体１１がどのように変位しても、プリンタ本体側の駆動歯車６とプーリ軸駆動歯車１４との間の軸間距離を一定に保って、これらの間で歯とびが生じることがないように構成されている。
【０００９】
このように構成された実施例において、いま、サイドフレーム１に立設した取付けピン５に係合部１５を係合させつつ、ここの取付け凹部３に駆動プーリ軸１３の軸受け１６を係合させ、ついで、フレーム本体１１後端の係合片１２を取付け凹部４に係合させるようにしてトラクタユニット１０をプリンタ本体に装着すると、駆動プーリ軸１３端のプーリ軸駆動歯車１４はプリンタ本体側の駆動歯車６と正しく噛合う。
【００１０】
そしてこの状態で、プーリ軸駆動歯車１４を介して駆動プーリ軸１３に駆動力を伝えつつ紙送りを開始すると、トラクタユニット１０は紙送りに伴う負荷によりフレーム本体１１後端の係合片１２を撓めつつプーリ軸駆動歯車１４をプリンタ本体側の駆動歯車６から離間させる方向にフレーム本体１１を回動させようとするが、上記したように、フレーム本体１１の駆動プーリ軸１３側に設けた係合部１５には、プーリ軸駆動歯車１４の軸心から取付けピン５までの距離Ｄと取付けピン５の半径ｄの２倍との和に相当する距離Ｌを隔てて、駆動プーリ軸１３の軸心を中心とする円弧状の内面１５ａが設けられているため、この係合部１５を取付けピン５に係合させれば、フレーム本体１１の駆動プーリ軸１３側が如何に変位しようともサイドフレーム１の取付け凹部３を中心にした回転しかできず、駆動歯車６とプーリ軸駆動歯車１４との軸間距離は常に一定に保持されて、両歯車６、１４相互の間に生じかねない歯とび現象は未然に抑えられる。
なお、上述の実施例においては紙送り位置の規定部材をピンの立設により構成しているが、プレス加工により凸部を形成しても同様の作用を奏する。
【００１１】
【発明の効果】
以上述べたように本発明によれば、紙送りに伴う負荷を受けて紙送り装置が如何に変位しても、プリンタ本体側の駆動歯車と紙送り装置側の歯車との間の軸間距離を一定に保持して、これら歯車相互の噛合いを常に確実に維持することができる。
【図面の簡単な説明】
【図１】プリンタ本体への装着状態をもって示した本発明の一実施例をなす取付け機構の構成図である。
【図２】本発明の一実施例をなすトラクタユニットの要部を示した斜視図である。
【図３】従来装置の一例を示した図である。
【符号の説明】
１サイドフレーム
２プリンタユニットの装着部
４駆動プーリ軸の受け部
５取付けピン
６駆動歯車
１０トラクタユニット
１１フレーム本体
１４プーリ軸駆動歯車
１５係合部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an attachment mechanism for attaching a paper feeding device called a tractor to a printer.
[0002]
[Prior art]
A push tractor or pull tractor, which is mounted on the printer body and meshes the pulley shaft drive gear with the drive gear on the printer body side to feed a long sheet of paper, is usually provided on the frame body a as shown in FIG. The hook portion b is mounted so as to be engaged with a part c of the printer main body. In such a mounting mechanism, the pulley shaft driving gear d is driven by the load at the time of the paper feeding operation. Displacement is made in a direction that forms a pressure angle α with respect to the tangential direction shown in the figure, and the engagement piece c at the rear end of the frame body a is bent, so that the distance between the axes of both gears d and e is increased. As a result of the rotational displacement in the direction, there is a disadvantage that tooth jumping may occur between them.
[0003]
[Problems to be solved by the invention]
The present invention has been made in view of such problems, and an object of the present invention is to provide an attachment mechanism for a paper feeding device that does not cause tooth jumping even when displaced by a load during paper feeding. There is to do.
[0004]
[Means for Solving the Problems]
That is, the present invention provides a paper feeding device having a gear that is detachably attached to the printer main body and meshes with the driving gear on the printer main body , as an attachment mechanism of the paper feeding device for achieving such a problem . As a mounting mechanism, a mounting recess (4) and a mounting pin (5) are provided at the mounting position of the paper feeding device of the printer body, and the frame of the paper feeding device is engaged with the mounting recess (4). and if possible engagement pieces (12), a distance corresponding to the sum of the diameter of the distance around the axis of the gear to the gear shaft center mounting pin (5) and the mounting pin (5) An engagement portion (15) that forms an arcuate attachment recess having a radius of and an attachment recess (3) that engages with the shaft of the drive gear are provided, and an engagement piece ( 12) Mounting pin (5) and removal Only recesses (3) each mounting recess of the printer (4), so that the recess of the engaging portion (15), and by Ri said sheet feeding apparatus to be engaged with the shaft of the drive gear is mounted on the printer body I made it.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Therefore, examples of the present invention will be described below.
1 and 2 show an embodiment of the present invention.
[0006]
In the side frame of the printer main body denoted by reference numeral 1 in the figure, a mounting portion 2 for mounting the tractor unit 10 via the frame main body 11 is mounted on the mounting recesses 3 and 4 at both ends thereof, and the bearing 16 and the frame of the drive pulley shaft 13. The tractor unit 10 is configured to be attached so that the engagement piece 12 at the rear end of the main body 11 is engaged, and the side of the drive pulley shaft 13 of the side frame 1 is from the center of the mounting recess 3 (arc). A mounting pin 5 is erected at a point separated by a distance L described later.
[0007]
On the other hand, as shown in FIG. 2, the frame main body 11 of the tractor unit 10 is provided with a pulley shaft driving gear 14 that meshes with the driving gear 6 provided on the printer main body side and transmits the driving force to the driving pulley. The drive pulley shaft 13 is provided with an engaging portion 15 that engages with the mounting pin 5 erected on the side frame 1 to fix the frame body 11 to the side frame 1.
[0008]
The engaging portion 15 has an arc-shaped inner surface 15 a centering on the axis of the pulley shaft driving gear 14, the distance D from the axis of the pulley shaft driving gear 14 to the mounting pin 5, and the radius of the mounting pin 5. the when the d, the distance L from the axis of the pulley shaft drive gear 14, have been formed at a distance such that D + 2 d, the frame body 11 and how the load during paper feeding Even when displaced, the axial distance between the drive gear 6 on the printer main body side and the pulley shaft drive gear 14 is kept constant, and no tooth jump occurs between them.
[0009]
In the embodiment configured as described above, the bearing 16 of the drive pulley shaft 13 is engaged with the mounting recess 3 while the engaging portion 15 is engaged with the mounting pin 5 erected on the side frame 1. Then, when the tractor unit 10 is mounted on the printer body so that the engagement piece 12 at the rear end of the frame body 11 is engaged with the mounting recess 4, the pulley shaft drive gear 14 at the end of the drive pulley shaft 13 is moved to the printer body side. It meshes correctly with the drive gear 6.
[0010]
In this state, when the paper feeding is started while transmitting the driving force to the driving pulley shaft 13 via the pulley shaft driving gear 14, the tractor unit 10 causes the engaging piece 12 at the rear end of the frame body 11 to be disengaged by the load accompanying the paper feeding. While the frame main body 11 is to be rotated in a direction in which the pulley shaft driving gear 14 is separated from the driving gear 6 on the printer main body side while being bent, as described above, it is provided on the driving pulley shaft 13 side of the frame main body 11. The engaging portion 15 is separated from the driving pulley shaft 13 by a distance L corresponding to the sum of the distance D from the axis of the pulley shaft driving gear 14 to the mounting pin 5 and twice the radius d of the mounting pin 5. Since an arcuate inner surface 15a centering on the shaft center is provided, if the engaging portion 15 is engaged with the mounting pin 5, the side of the drive pulley shaft 13 of the frame body 11 is displaced no matter how it is displaced. A tooth that can only rotate about the mounting recess 3 of the ram 1 and the distance between the drive gear 6 and the pulley shaft drive gear 14 is always kept constant, and may occur between the gears 6 and 14. The jumping phenomenon can be suppressed in advance.
In the above-described embodiment, the paper feed position defining member is formed by standing a pin, but the same effect is obtained even if the convex portion is formed by pressing.
[0011]
【The invention's effect】
As described above, according to the present invention, the distance between the shafts between the drive gear on the printer main body side and the gear on the paper feed device side, no matter how the paper feed device is displaced under the load accompanying the paper feed. Is kept constant, and the meshing of these gears can always be maintained reliably.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an attachment mechanism according to an embodiment of the present invention shown in a state of being mounted on a printer body.
FIG. 2 is a perspective view showing a main part of a tractor unit according to an embodiment of the present invention.
FIG. 3 is a diagram showing an example of a conventional apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Side frame 2 Printer unit mounting part 4 Drive pulley shaft receiving part 5 Mounting pin 6 Drive gear 10 Tractor unit 11 Frame body 14 Pulley shaft drive gear 15 Engagement part

Claims

As an attachment mechanism of a paper feeding device that is detachably attached to the printer body and has a gear that meshes with the drive gear on the printer body side,
A mounting recess (4) and a mounting pin (5) are provided at the mounting position of the paper feeding device of the printer body ,
Also the frame of the paper feeder, the mounting recesses (4) engageable with the engagement piece (12), the upper Symbol gear centered on the axis of the gear shaft center mounting pin (5) engaging portion forming the arcuate mounting recess for a distance corresponding to the sum of the diameter of the distance to and the mounting pin (5) and the radius (15), mounted for engaging the shaft of the drive gear A recess (3), and an engaging piece (12), a mounting pin (5), and a mounting recess (3) of the frame of the paper feeding device are respectively connected to the mounting recess (4) and the engaging portion ( 15) A paper feeding device mounting mechanism, wherein the paper feeding device is attached to the printer main body by engaging with the recess of 15) and the shaft of the drive gear .