JP3724641B2 - Medium transport device - Google Patents

Medium transport device Download PDF

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Publication number
JP3724641B2
JP3724641B2 JP2001334878A JP2001334878A JP3724641B2 JP 3724641 B2 JP3724641 B2 JP 3724641B2 JP 2001334878 A JP2001334878 A JP 2001334878A JP 2001334878 A JP2001334878 A JP 2001334878A JP 3724641 B2 JP3724641 B2 JP 3724641B2
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Japan
Prior art keywords
guide
medium
locking
opening
sensor
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JP2001334878A
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JP2003137456A (en
Inventor
祐二 中垣
満春 宍戸
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Seiko Precision Inc
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Seiko Precision Inc
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Description

【0001】
【発明の属する技術分野】
本発明は、例えばプリンタにおける供給される媒体の印字紙を搬送させる装置であって、搬送するときこの印字紙の存在の有無を検出するセンサなどを取付けた媒体搬送装置に関するものである。
【0002】
【従来の技術】
従来から、例えばセンサを搭載した回路基板をプリンタなどの電子機器に直接取付ける場合、または、センサを予めホルダーに収納しておき、このホルダーを電子機器に取付ける場合、その取付け方法は複数の個所をねじ止めすることによるものと接着剤によるものとがある。
【0003】
【発明が解決しようとする課題】
しかし、ねじ止め方法ではねじの弛みによるずれの発生を防止するため、電子機器の複数個所にねじ止めすることが必要であり、接着剤を使用する場合には乾燥時間が必要であるため煩雑な手間と時間がかかっていた。
【0004】
そこで、本発明の目的はなるべく短時間にセンサ(光学的スイッチ、リミットスイッチなど)を簡単に取り付けることのできる媒体搬送装置を提供することにある。
【0005】
【課題を解決するための手段】
本願発明に係る媒体搬送装置の特徴は、請求項1に記載しているように、ガイドとセンサホルダーとを有し、上記ガイドには媒体搬送路とこの媒体搬送路に連通する開口部とが形成してあり、上記センサホルダーは媒体検出用センサを保持するもので、本体部と一対の係止片とからなり、上記一対の係止片は弾性変形可能で、その先端にはそれぞれ係止爪が形成してあり、上記係止爪には傾斜面が形成してある。そして、上記係止片を上記ガイドの上記開口部に挿入するとき、上記係止爪の上記傾斜面はこの係止爪の上記開口部への挿入動作によって上記一対の係止片を弾性変形させ上記開口部への挿入を許容するものであり、上記係止爪は上記係止片の上記開口部の挿入状態で上記ガイドの内面に係止されて上記係止片の抜け止め作用をなし、且つ媒体搬送方向に対向し、上記センサホルダーの本体部は上記ガイドの外面に当接し、上記係止爪の上記傾斜面は上記ガイドの内面への係止状態で上記媒体の先端が接触したときに上記媒体の先端をその下流に案内するものであるところにある。
【0006】
本発明の他の特徴は請求項2に記載しているように、上記本体部は上記センサを収納する箱状に形成されているところにある。
【0007】
本発明のさらに他の特徴は請求項3に記載しているように、上記本体部は上記ガイドの外面に弾接しているところにある。
【0008】
勿論、上記センサは光学的なスイッチばかりでなく、リミットスイッチであってもよい。
【0009】
【発明の実施の形態】
以下、図面を参照して本発明の実施の態様を説明すると、図1においてプリンタの印字ヘッド1に対向してプラテン2が設けてあり、この印字ヘッドとプラテンの両側には、それぞれ搬送手段である駆動ローラ3、31とこの各駆動ローラには押圧ローラ4、41が弾接し、この押圧ローラは駆動ローラの回転に従動しいる。さらに、両駆動ローラ3、31の外側には、それぞれセンサS1、S2が設けてある。そのため、図1において、その左側から印字媒体の印字紙Pが供給され搬送される場合には、先ず左側に設置してある駆動ローラ3と押圧ローラ4でこの印字紙は挟持されて搬送され、次に印字ヘッド1とプラテン2により印字され、さらに右方に向けて搬送されて右側の駆動ローラ31と押圧ローラ41により挟持され、さらに搬送され右方向へ排出される。
【0010】
この場合、印字紙Pは左側の駆動ローラ3と押圧ローラ4に挟持される前にセンサS1によりその存在が予め検知され、印字された後、さらに、右側に位置する駆動ローラ31と押圧ローラ41の間を通過した後でセンサS2により印字紙が存在しなくなったことが検知される。
【0011】
なお、これとは逆に印字紙Pが右側から左側に向けて供給される場合も、プラテン2や駆動ローラ3、31や押圧ローラ4、41の回転方向と、検知の順序が逆になるだけで、作動状態は実質的に同一である。
【0012】
次に、本発明の特徴のプリンタにおける媒体搬送装置について説明する。図2、図3に示すように、この構成を大別すると、印字媒体である印字紙Pを搬送する場合にガイドする2枚の第1、第2のガイド5、51とセンサホルダーの本体部6とからなり、この両ガイドの間は媒体搬送路9になっている。さらに、第1のガイド5には、この媒体搬送路9に連通する検知用及び係止用の開口部5aが形成してある。さらに、第2のガイド51にも反射型センサSの検知の誤動作防止用の開口51aが形成してある。
【0013】
また、センサホルダーは媒体検出用のセンサSを保持するもので、このセンサホルダーは本体部6と一対の係止片82、82とからなり、この本体部の構造は回路基板7とこの回路基板の下面にビス10でねじ止めしてある中空状で下端開口の収納箱体8とから構成してあり、この収納箱体は左右方向に長い長方形である。この収納箱体8の全外周壁81の下端面は第1のガイド5の上面に当接する。また、収納箱体8の内部には、この収納箱体の長手方向に直交する方向に一対の係止片82、82が対向状態で一体的に形成してあり、この係止片は弾性変形可能である。また、係止片82、82の間の空間はセンサSを収納するための収納室8aになっている。なお、センサSは回路基板7に搭載してあり、このセンサはこの実施例では反射型のものである。
【0014】
一対の係止片82、82の下端は自由端になって、下端にはそれぞれ係止爪82a、82aが一体的に形成してある。そして、この係止片82、82及び係止爪82a、82aの幅は、第1のガイド5の開口部5aに挿入可能なもので、この係止爪には傾斜面82b、82bが形成してある。そのため、係止爪82a、82aはガイド5の開口部5aを貫通し、この第1のガイド5の開口部5aに係止可能なものであるが、この係止爪の傾斜面82b,82bは、この係止爪のこの開口部への挿入動作によって一対の係止片82、82を弾性変形させ、この開口部への挿入を容易にし許容するものである。また、係止片82、82の内面で、反射型センサSとの間には若干の空隙があり、これは係止爪82a、82aをスムーズに開口部5aに係止させるためである。そして、係止爪82a、82aは係止片82、82の抜け止め作用をし、また、この係止爪は媒体搬送路9において印字紙Pの搬送方向に対向する。
【0015】
そして、センサSの下面は係止爪82a、82aの下端と同一レベルまたはそれよりも上方に位置するものである。さらに、この係止爪82a、82aの傾斜面82b,82bは、印字紙Pの先端が接触したとき、この印字紙の先端をその下流に案内するものである。そのため、実線にて示すように印字紙Pが媒体搬送路9の左方向から供給される場合でも、2点鎖線にて示すように印字紙Pが媒体搬送路の右方向から供給される場合でも、この印字紙の先端がこの係止爪82aに接触しても、その傾斜面82bにより円滑にガイドされて下流に移動できるようになっている。
【0016】
したがって、センサホルダーの本体部6を第1のガイド5に取付ける場合には、予め工場にて回路基板7に収納箱体8が固着してあるこの本体部6を、このガイドの上面から押下すると、係止片82、82の下端の係止爪82a、82aの傾斜面82b,82bは、このガイドの開口部5aの縁に当接して、さらに押下するとこの係止片は自己の弾性力に抗して内方に向けて弾性的に変形し、係止爪82a、82aが開口部5aを貫通した瞬間、自己の弾性力により自動的に復元し、この開口部5aの下面に係止する。そのため、センサホルダーの取付けが簡単であり、かつ敏速に行うことができる。
【0017】
そして、印字紙Pが搬送路9内を搬送されているとき、この印字紙がセンサSの下面を通過すると、このセンサからの投光がこの印字紙で反射し、この印字紙の存在がセンサSにより検知される。
【0018】
次に、図4を参照して他の実施の態様について説明する。この特徴は本体部6の収納箱体8の全外周壁81のうち、対向する外周壁811、811の下端を自由端にし、この外周壁の長さを、前記の実施の態様の外周壁81よりも長く、例えば係止片82、82の長さとほぼ同一にしておくものである。
【0019】
したがって、センサホルダーを第1のガイド5に取付ける場合には、先に説明した実施の態様と同様に、このガイドの上面から押下すると、係止爪82a、82aが開口部5aを貫通した瞬間、自己の弾性力により自動的に復元し、この開口部の下面に係止する。これと同時に、外周壁811は自己の弾性力に抗して外側に湾曲し、この弾性力を保持したまま係止爪82a、82aは開口部5aに係止する。そのため、センサホルダーは、ガイド5に対してばね性をもったまま保持されているので、上下にがたつくことがなくなり、前記の実施の態様と同様にセンサホルダーの取付けが簡単であり、かつ敏速に行うことができる。
【0020】
【発明の効果】
本発明によると、センサホルダーをガイドに取付けるのが簡単であり、かつ敏速に行うことができる。また、センサホルダーの本体部をガイドの上面に弾接するようにすると、センサホルダーの本体部はばね性をもったままであるので、ガイドに対して上下にがたつくことがなくなる。
【図面の簡単な説明】
【図1】プリンタ全体を示す正面図である。
【図2】センサホルダーの平面図である。
【図3】センサホルダーにセンサを取付けた状態の垂直断面図である。
【図4】他の実施の態様を示す垂直断面図である。
【符号の説明】
5 ガイド
5a ガイドの開口部
51 ガイド
6 センサホルダーの本体部
82 係止片
82a 係止爪
82b 係止爪の傾斜面
9 媒体搬送路
811 本体部(外周壁)
P 媒体(印字紙)
S センサ
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for conveying printing paper of a medium to be supplied in a printer, for example, and relates to a medium conveying apparatus equipped with a sensor for detecting the presence or absence of the printing paper when being conveyed.
[0002]
[Prior art]
Conventionally, for example, when a circuit board on which a sensor is mounted is directly attached to an electronic device such as a printer, or when a sensor is stored in a holder in advance and this holder is attached to an electronic device, the mounting method includes a plurality of locations. Some are screwed and some are adhesive.
[0003]
[Problems to be solved by the invention]
However, in the screwing method, in order to prevent the occurrence of displacement due to loosening of the screw, it is necessary to screw the electronic device at a plurality of locations, and when using an adhesive, a drying time is required, which is complicated. It took time and effort.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a medium transport apparatus in which a sensor (such as an optical switch or a limit switch) can be easily attached in as short a time as possible.
[0005]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a medium transport device having a guide and a sensor holder, wherein the guide has a medium transport path and an opening communicating with the medium transport path. The sensor holder is configured to hold a medium detection sensor. The sensor holder includes a main body portion and a pair of locking pieces. The pair of locking pieces are elastically deformable, and are respectively locked at the tips thereof. A claw is formed, and the locking claw has an inclined surface. When the locking piece is inserted into the opening of the guide, the inclined surface of the locking claw elastically deforms the pair of locking pieces by the insertion operation of the locking claw into the opening. The insertion into the opening is allowed, and the locking claw is locked to the inner surface of the guide in the inserted state of the opening of the locking piece to prevent the locking piece from coming off, And the body of the sensor holder is in contact with the outer surface of the guide, and the inclined surface of the locking claw is in contact with the inner surface of the guide when the front end of the medium contacts. The leading end of the medium is guided downstream.
[0006]
According to another aspect of the present invention, the main body is formed in a box shape for housing the sensor.
[0007]
According to still another aspect of the present invention, as described in claim 3, the main body is in elastic contact with the outer surface of the guide.
[0008]
Of course, the sensor may be a limit switch as well as an optical switch.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a platen 2 is provided to face the print head 1 of the printer, and both sides of the print head and the platen are respectively conveyed by conveying means. The driving rollers 3 and 31 and the pressing rollers 4 and 41 are in elastic contact with the driving rollers, and the pressing rollers are driven by the rotation of the driving rollers. Further, sensors S1 and S2 are provided outside the drive rollers 3 and 31, respectively. Therefore, in FIG. 1, when the printing paper P of the printing medium is supplied and conveyed from the left side, the printing paper is first sandwiched and conveyed by the driving roller 3 and the pressing roller 4 installed on the left side, Next, printing is performed by the print head 1 and the platen 2, and the paper is further conveyed to the right, is sandwiched between the right driving roller 31 and the pressing roller 41, and is further conveyed and discharged rightward.
[0010]
In this case, the presence of the printing paper P is detected in advance by the sensor S1 before being sandwiched between the driving roller 3 and the pressing roller 4 on the left side. After passing between the two, the sensor S2 detects that the printing paper is no longer present.
[0011]
In contrast, when the printing paper P is supplied from the right side to the left side, the rotation direction of the platen 2, the driving rollers 3, 31 and the pressing rollers 4, 41 is only reversed. The operating state is substantially the same.
[0012]
Next, a description will be given of a medium transport device in a printer having the features of the present invention. As shown in FIG. 2 and FIG. 3, when this configuration is roughly divided, the first and second guides 5 and 51 and the main body of the sensor holder that are guided when the printing paper P as a printing medium is conveyed. 6 and a medium conveyance path 9 is formed between the two guides. Further, the first guide 5 is formed with detection and locking openings 5 a communicating with the medium transport path 9. Further, the second guide 51 is also provided with an opening 51a for preventing malfunction of detection by the reflective sensor S.
[0013]
The sensor holder holds a medium detection sensor S. The sensor holder includes a main body 6 and a pair of locking pieces 82 and 82. The structure of the main body includes the circuit board 7 and the circuit board. The housing box 8 is hollow and screwed to the lower surface of the housing with a screw 10 and has a lower end opening. The housing box has a rectangular shape that is long in the left-right direction. The lower end surface of the entire outer peripheral wall 81 of the storage box 8 abuts on the upper surface of the first guide 5. A pair of locking pieces 82 and 82 are integrally formed in the storage box 8 so as to be opposed to each other in a direction perpendicular to the longitudinal direction of the storage box, and the locking pieces are elastically deformed. Is possible. The space between the locking pieces 82 is a storage chamber 8a for storing the sensor S. The sensor S is mounted on the circuit board 7, and this sensor is of a reflective type in this embodiment.
[0014]
The lower ends of the pair of locking pieces 82 and 82 are free ends, and locking claws 82a and 82a are integrally formed at the lower ends. The widths of the locking pieces 82 and 82 and the locking claws 82a and 82a can be inserted into the opening 5a of the first guide 5, and inclined surfaces 82b and 82b are formed on the locking claws. It is. Therefore, the locking claws 82a and 82a penetrate the opening 5a of the guide 5 and can be locked to the opening 5a of the first guide 5. The inclined surfaces 82b and 82b of the locking claw are The pair of locking pieces 82 and 82 are elastically deformed by the insertion operation of the locking claw into the opening to facilitate and allow the insertion into the opening. Further, there is a slight gap between the inner surface of the locking pieces 82 and 82 and the reflective sensor S. This is for smoothly locking the locking claws 82a and 82a to the opening 5a. The locking claws 82 a and 82 a prevent the locking pieces 82 and 82 from coming off, and the locking claws face the conveyance direction of the printing paper P in the medium conveyance path 9.
[0015]
The lower surface of the sensor S is positioned at the same level as or higher than the lower ends of the locking claws 82a and 82a. Further, the inclined surfaces 82b and 82b of the locking claws 82a and 82a guide the leading edge of the printing paper downstream when the leading edge of the printing paper P comes into contact. Therefore, even when the printing paper P is supplied from the left direction of the medium conveyance path 9 as indicated by a solid line, even when the printing paper P is supplied from the right direction of the medium conveyance path as indicated by a two-dot chain line. Even when the leading edge of the printing paper comes into contact with the locking claw 82a, the printing paper is smoothly guided by the inclined surface 82b and can move downstream.
[0016]
Therefore, when attaching the main body part 6 of the sensor holder to the first guide 5, when the main body part 6 having the storage box 8 fixed to the circuit board 7 in advance at the factory is pressed down from the upper surface of the guide, The inclined surfaces 82b and 82b of the locking claws 82a and 82a at the lower ends of the locking pieces 82 and 82 abut against the edge of the opening 5a of the guide, and when the pressing pieces are further pressed, the locking pieces have their own elasticity. When the locking claws 82a and 82a penetrate through the opening 5a, they are automatically restored by their own elastic force and locked to the lower surface of the opening 5a. . Therefore, the attachment of the sensor holder is simple and can be performed quickly.
[0017]
When the printing paper P is conveyed in the conveyance path 9 and the printing paper passes through the lower surface of the sensor S, the light emitted from the sensor is reflected by the printing paper, and the presence of the printing paper is detected by the sensor. Detected by S.
[0018]
Next, another embodiment will be described with reference to FIG. This feature is that, of all the outer peripheral walls 81 of the storage box 8 of the main body 6, the lower ends of the opposing outer peripheral walls 811, 811 are free ends, and the length of this outer peripheral wall is set to the outer peripheral wall 81 of the above embodiment. Longer than, for example, substantially the same as the length of the locking pieces 82, 82.
[0019]
Therefore, when the sensor holder is attached to the first guide 5, as in the embodiment described above, when the sensor holder is pressed from the upper surface of the guide, the moment when the locking claws 82a and 82a penetrate the opening 5a, It is automatically restored by its own elastic force and locked to the lower surface of this opening. At the same time, the outer peripheral wall 811 curves outward against its own elastic force, and the locking claws 82a and 82a are locked to the opening 5a while maintaining this elastic force. For this reason, since the sensor holder is held with a spring property with respect to the guide 5, the sensor holder does not rattle up and down, and the sensor holder can be easily mounted and quickly as in the above embodiment. It can be carried out.
[0020]
【The invention's effect】
According to the present invention, it is easy to attach the sensor holder to the guide and it can be performed quickly. Further, if the main body of the sensor holder is elastically contacted with the upper surface of the guide, the main body of the sensor holder remains springy, so that it does not rattle up and down with respect to the guide.
[Brief description of the drawings]
FIG. 1 is a front view illustrating an entire printer.
FIG. 2 is a plan view of a sensor holder.
FIG. 3 is a vertical sectional view showing a state in which a sensor is attached to a sensor holder.
FIG. 4 is a vertical sectional view showing another embodiment.
[Explanation of symbols]
5 Guide 5a Guide opening 51 Guide 6 Sensor holder main body 82 Locking piece 82a Locking claw 82b Locking claw inclined surface 9 Medium transport path 811 Main body (outer peripheral wall)
P Medium (printing paper)
S sensor

Claims (3)

ガイドとセンサホルダーとを有し、
上記ガイドには媒体搬送路とこの媒体搬送路に連通する開口部とが形成してあり、
上記センサホルダーは媒体検出用センサを保持するもので、本体部と一対の係止片とからなり、
上記一対の係止片は弾性変形可能で、その先端にはそれぞれ係止爪が形成してあり、
上記係止爪には傾斜面が形成してあり、
上記係止片は上記ガイドの上記開口部に挿入され、
上記係止爪の上記傾斜面はこの係止爪の上記開口部への挿入動作によって上記一対の係止片を弾性変形させ上記開口部への挿入を許容するものであり、
上記係止爪は上記係止片の上記開口部の挿入状態で上記ガイドの内面に係止されて上記係止片の抜け止め作用をなし、且つ媒体搬送方向に対向し、
上記センサホルダーの本体部は上記ガイドの外面に当接し、
上記係止爪の上記傾斜面は上記ガイドの内面への係止状態で上記媒体の先端が接触したときに上記媒体の先端をその下流に案内するものである
ことを特徴とする媒体搬送装置。
Having a guide and a sensor holder,
The guide has a medium conveyance path and an opening communicating with the medium conveyance path,
The sensor holder holds a medium detection sensor, and includes a main body portion and a pair of locking pieces.
The pair of locking pieces can be elastically deformed, and a locking claw is formed at each end thereof,
The locking claw has an inclined surface,
The locking piece is inserted into the opening of the guide,
The inclined surface of the locking claw elastically deforms the pair of locking pieces by the insertion operation of the locking claw into the opening, and allows insertion into the opening.
The locking claw is locked to the inner surface of the guide in the inserted state of the opening of the locking piece to prevent the locking piece from coming off, and is opposed to the medium transport direction.
The main body of the sensor holder contacts the outer surface of the guide,
The medium conveying apparatus according to claim 1, wherein the inclined surface of the locking claw guides the leading edge of the medium downstream when the leading edge of the medium comes into contact with the inner surface of the guide.
請求項1において、上記本体部は上記センサを収納する箱状に形成されていることを特徴とする媒体搬送装置。2. The medium transporting apparatus according to claim 1, wherein the main body is formed in a box shape that houses the sensor. 請求項1または2において、上記本体部は上記ガイドの外面に弾接していることを特徴とする媒体搬送装置。3. The medium conveying apparatus according to claim 1, wherein the main body is in elastic contact with the outer surface of the guide.
JP2001334878A 2001-10-31 2001-10-31 Medium transport device Expired - Fee Related JP3724641B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103802499A (en) * 2012-11-07 2014-05-21 西铁城控股株式会社 Printer

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JP6350049B2 (en) * 2014-07-08 2018-07-04 株式会社リコー Detection apparatus and image forming apparatus
US11815125B2 (en) 2019-04-08 2023-11-14 Hewlett-Packard Development Company, L.P. Devices for retaining articles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103802499A (en) * 2012-11-07 2014-05-21 西铁城控股株式会社 Printer
CN103802499B (en) * 2012-11-07 2017-12-01 西铁城时计株式会社 Printer

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