US20070194517A1 - Paper tray unit - Google Patents
Paper tray unit Download PDFInfo
- Publication number
- US20070194517A1 US20070194517A1 US11/670,093 US67009307A US2007194517A1 US 20070194517 A1 US20070194517 A1 US 20070194517A1 US 67009307 A US67009307 A US 67009307A US 2007194517 A1 US2007194517 A1 US 2007194517A1
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- US
- United States
- Prior art keywords
- paper
- paper tray
- pair
- original document
- tray unit
- 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.)
- Abandoned
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H1/00—Supports or magazines for piles from which articles are to be separated
- B65H1/04—Supports or magazines for piles from which articles are to be separated adapted to support articles substantially horizontally, e.g. for separation from top of pile
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2220/00—Function indicators
- B65H2220/09—Function indicators indicating that several of an entity are present
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2403/00—Power transmission; Driving means
- B65H2403/50—Driving mechanisms
- B65H2403/51—Cam mechanisms
- B65H2403/513—Cam mechanisms involving elongated cam, i.e. parallel to linear transport path
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/10—Size; Dimensions
- B65H2511/12—Width
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/20—Location in space
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2553/00—Sensing or detecting means
- B65H2553/40—Sensing or detecting means using optical, e.g. photographic, elements
- B65H2553/41—Photoelectric detectors
- B65H2553/412—Photoelectric detectors in barrier arrangements, i.e. emitter facing a receptor element
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2553/00—Sensing or detecting means
- B65H2553/60—Details of intermediate means between the sensing means and the element to be sensed
- B65H2553/61—Mechanical means, e.g. contact arms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2801/00—Application field
- B65H2801/03—Image reproduction devices
- B65H2801/06—Office-type machines, e.g. photocopiers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2801/00—Application field
- B65H2801/39—Scanning
Definitions
- the height dimension of the entire ADF 73 increases. Specifically, since the paper size sensor 82 is attached to the original document tray 78 such that the height direction of the paper size sensor 82 , which is a direction in which the dimension of the paper size sensor 82 is large, extends in the height direction of the original document tray unit 71 , a height dimension of the original document tray unit 71 increases as a whole. Meanwhile, the paper discharge port 77 provided directly under the original document tray unit 71 is required to be positioned at a certain height above the paper discharge tray 72 .
- a slidable original document width guide 7 may be provided only at one side in a width direction of the original document, and a positioning wall member (not shown) or the like may be fixedly provided on the other side in the width direction of the original document. Accordingly, by sliding the original document width guide 7 , both sides of the original document in the width direction can be positioned.
- the pair of the paper size sensors 11 is used to determine the paper size of the original document by detecting or not detecting each of the movable members 10 A and 10 B. Since a structure of the paper size sensor 11 is the same as the conventional paper size sensor 82 , like reference numerals are used in FIGS. 6 and 9 , and a description thereof will be omitted. As illustrated in FIG.
- the control unit receives an ON-signal from both paper size sensors 11 , and determines that the original document placed on the original document tray 6 is size B4.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
Abstract
A paper tray unit includes a paper size sensor which is attached to a paper tray and determines a paper size in a paper width direction by detecting a position of a paper width guide. In the paper tray unit, a movable member moves in a paper feed direction accompanying movement of the paper width guide. The position of the paper width guide is detected by the paper size sensor detecting or not detecting the movable member.
Description
- 1. Field of the Invention
- The present invention relates to a paper tray unit on which a paper is placed to be fed into a paper transportation path. In particular, the present invention relates to a paper tray unit including a paper width guide, which is movably mounted on an upper surface of the paper tray unit in a direction that is substantially perpendicular to a paper feed direction and positions a paper in a paper width direction, and a paper size sensor, which is provided on a reverse surface of the paper tray unit and determines a paper size in the paper width direction by detecting a position of the paper width guide.
- 2. Description of the Related Art
- Many scanners, facsimiles, and copiers or the like have an image scanning device for scanning image information of an original document. One image scanning method used in the image scanning device is a sheet through method, which scans an image by sequentially transporting a plurality of original documents. The sheet through method is mainly used by an Automatic Document Feeder (ADF). FIG. 8 is a schematic longitudinal sectional view of a conventional
image scanning device 70 accommodating the ADF. As illustrated inFIG. 8 , theimage scanning device 70 includes an originaldocument tray unit 71, a paper discharge tray 72, and an ADF 73. Anoriginal document 101 to be scanned is placed on the originaldocument tray unit 71. The paper discharge tray 72 is provided directly under the originaldocument tray unit 71. The ADF 73 transports theoriginal document 101 from the originaldocument tray unit 71 onto the paper discharge tray 72. In theimage scanning device 70, theoriginal documents 101 stacked on the originaldocument tray unit 71 are separated one sheet at a time from an uppermost sheet by a paper feed unit 74, which defines theADF 73, and eachoriginal document 101 is transported from apaper feed port 75 into an originaldocument transportation path 76. After image information is scanned at a prescribed position in the originaldocument transportation path 76, theoriginal document 101 is discharged from apaper discharge port 77 onto the paper discharge tray 72. - As illustrated in
FIG. 8 , the originaldocument tray unit 71 includes anoriginal document tray 78, a pair of right and left originaldocument width guides 79, apinion gear 80, a pair ofrack members 81, andpaper size sensors 82. Theoriginal document 101 is placed on theoriginal document tray 78. The pair of the right and left originaldocument width guides 79 is slidable in a direction orthogonal to apaper feed direction 100, which is shown by an outlined arrow inFIG. 8 , on an upper surface of theoriginal document tray 78. The pair of the right and left originaldocument width guides 79 positions theoriginal document 101 in a paper width direction. Thepinion gear 80 is rotatably supported on a reverse surface of theoriginal document tray 78. Therack members 81 are respectively integrated with each of the originaldocument width guides 79 and are meshed with thepinion gear 80. Thepaper size sensor 82 is provided on the reverse surface of theoriginal document tray 78 and determines a size of theoriginal document 101 in the paper width direction. In the above-described structure, when one of the originaldocument width guides 79 slides, the other originaldocument width guide 79 slides in an opposite direction accordingly. -
FIG. 9 is an enlarged schematic perspective view of thepaper size sensor 82. In thepaper size sensor 82, a light-emittingelement 83, which emits a light beam, and a light-receivingelement 84, which detects the emitted light beam, are arranged to face one another across adetection groove 85. Thepaper size sensor 82 is a transmissive optical sensor which detects a passage of an object when light is blocked. Thepaper size sensor 82 has a height dimension H that is larger than a depth dimension D, and is provided with four snap-fits 86 at a base end portion of thepaper size sensor 82 for attaching thepaper size sensor 82 to the reverse surface of theoriginal document tray 78. As illustrated inFIG. 8 , two of thepaper size sensors 82 are arranged in the originaldocument tray unit 71 such that a height direction of thepaper size sensor 82 extends in a height direction of the originaldocument tray unit 71. Each of thepaper size sensors 82 detects a position of each of the originaldocument width guides 79 by detecting or not detecting arib 87 protruding from each of therack members 81. Accordingly, a paper size of theoriginal document 101 in the paper width direction can be determined. - However, because of a structure of the conventional original
document tray unit 71, the height dimension of the entire ADF 73 increases. Specifically, since thepaper size sensor 82 is attached to the original document tray 78 such that the height direction of thepaper size sensor 82, which is a direction in which the dimension of thepaper size sensor 82 is large, extends in the height direction of the originaldocument tray unit 71, a height dimension of the originaldocument tray unit 71 increases as a whole. Meanwhile, thepaper discharge port 77 provided directly under the originaldocument tray unit 71 is required to be positioned at a certain height above the paper discharge tray 72. That is, if a leading edge of theoriginal document 101 touches the paper discharge tray 72 before theoriginal document 101 is completely discharged from thepaper discharge port 77, friction is generated between theoriginal document 101 and the paper discharge tray 72, causing a state in which theoriginal document 101 stops without being dropped onto the paper discharge tray 72. In such a state, the nextoriginal document 101 may discharge underneath the stoppedoriginal document 101, changing an order of theoriginal documents 101, or a paper jam may occur. In order to prevent such problems, an end portion of the originaldocument transportation path 76 is sloped upward, positioning thepaper discharge port 77 at a certain height above the paper discharge tray 72. Accordingly, theoriginal document 101 is completely discharged from thepaper discharge port 77 before the leading edge of theoriginal document 101 touches the paper discharge tray 72. In the above-described structure of theADF 73 and the originaldocument tray unit 71, a certain height is required between thepaper feed port 75 and thepaper discharge port 77 so that theoriginal document 101 discharged from thepaper discharge port 77 does not touch thepaper size sensor 82. Accordingly, the height dimension of the entire ADF 73 increases, which is not preferable in terms of saving space. - In order to overcome the problems described above, preferred embodiments of the present invention provide a structure for preventing a discharged original document from touching an original document tray unit, without requiring a large height dimension to be provided between a paper feed port and a paper discharge port by minimizing a height of the original document tray unit.
- According to a preferred embodiment of the present invention, a paper tray unit includes a paper tray, a paper width guide, and a paper size sensor. A paper to be fed into a paper transportation path is placed on the paper tray. A paper discharge port of the paper transportation path is provided directly under the paper tray. The paper width guide is arranged on an upper surface of the paper tray to be movable in a direction that is substantially perpendicular to a paper feed direction and determines a position of the paper in a paper width direction. The paper size sensor is attached to a reverse surface of the paper tray and determines a size of the paper in the paper width direction by detecting a position of the paper width guide. In the above-described paper tray, a movable member, which moves in the paper feed direction accompanying movement of the paper width guide, is provided, and a position of the paper width guide is detected by the paper size sensor by detecting or not detecting the movable member.
- According to another preferred embodiment of the present invention, in the paper tray unit, a height of the paper size sensor protruding from a reverse surface of the paper tray is within a range in which the paper discharged from the paper discharge port does not touch the paper size sensor.
- According to another preferred embodiment of the present invention, in the paper tray unit, the paper size sensor is a transmissive optical sensor which emits a light beam across a detection groove. Further, the movable member passes through the detection groove.
- According to another preferred embodiment of the present invention, in the paper tray unit, the paper size sensor has the largest dimension in a height direction of the detection groove and is attached such that the height direction of the detection groove is substantially parallel to the paper tray unit.
- According to each of the above-described preferred embodiments of the present invention, in the paper tray unit, the movable member moves in the paper feed direction accompanying the movement of the paper width guide. A paper size in a paper width direction can be determined by the paper size sensor by detecting the movable member. Thus, the paper size sensor can be attached such that a depth direction of the paper size sensor, which has a small dimension, extends in a height direction of the paper tray unit. As a result, a height of the entire paper tray unit can be reduced, and even without providing a long distance between the paper feed port and the paper discharge port, a paper discharged from the paper discharge port can be prevented from touching the paper tray unit. Accordingly, the height dimension of the entire device can be reduced, and space can be saved.
- Other features, elements, processes, steps, characteristics and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the present invention with reference to the attached drawings.
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FIG. 1 is a schematic perspective view illustrating an exterior of an image scanning device including an original document tray unit according to a first preferred embodiment of the present invention. -
FIG. 2 is a schematic plan view illustrating a structure of a reverse surface of an original document tray unit. -
FIG. 3 is a schematic plan view illustrating a structure of the reverse surface of the original document tray unit. -
FIG. 4 is a schematic plan view illustrating a structure of the reverse surface of the original document tray unit. -
FIG. 5 is a schematic plan view illustrating a structure of the reverse surface of the original document tray unit. -
FIG. 6 is a schematic perspective view illustrating an attachment state of a rack member, a movable member, a pinion gear, and a paper size sensor. -
FIG. 7 is a schematic plan view illustrating a structure of a reverse surface of an original document tray unit according to a second preferred embodiment of the present invention. -
FIG. 8 is a schematic perspective view illustrating a reverse surface of an original document tray unit according to a conventional art. -
FIG. 9 is a schematic perspective view illustrating an exterior of a paper size sensor according to a conventional art. - Description will be made of an original document tray unit according to preferred embodiments of the present invention with reference to the drawings.
FIG. 1 is a schematic perspective view illustrating an exterior of animage scanning device 200 including an original document tray unit 1 according to a first preferred embodiment of the present invention. Theimage scanning device 200 is mounted on an upper portion of a copy-and-facsimile multi function peripheral or the like, and is used to scan image information of an original document to be copied or to be transmitted by facsimile. Theimage scanning device 200 includes a devicemain body 2, anADF 3, an original document tray unit (a paper tray unit) 1, apaper discharge tray 4, and anoperation panel 5. The devicemain body 2 accommodates an image scanning unit (not illustrated) inside a hollow chassis. TheADF 3 is provided on an upper surface of the devicemain body 2. The original document (a paper) to be scanned is placed on the original document tray unit 1. The scanned original document is discharged to thepaper discharge tray 4. Theoperation panel 5 is provided on a front surface of the devicemain body 2 and is used to operate theimage scanning device 200. - In the
image scanning device 200, when a user issues a start command for a scanning operation by operating theoperation panel 5, the original documents stacked on the original document tray unit 1 are picked up one sheet at a time from an uppermost sheet and fed into theADF 3. The original document is then transported along an original document transportation path (a paper transportation path) in theADF 3, and the image information of the original document is scanned at a prescribed position in the original document transportation path by the image scanning unit. The scanned original document is transported further downstream through the original document transportation path and discharged onto thepaper discharge tray 4 from the paper discharge port (not illustrated) provided directly under the original document tray unit 1. -
FIGS. 2 and 5 are schematic plan views illustrating the structure of a reverse surface of the original document tray unit 1. As illustrated inFIGS. 1 and 2 , the original document tray unit 1 includes anoriginal document tray 6, a pair of right and left paper width guides 7, apinion gear 8, a pair ofrack members movable members paper size sensors 11. Theoriginal document tray 6 is a paper tray on which the original document is stacked. The pair of the right and left paper width guides 7 is provided on an upper surface of theoriginal document tray 6, on which the original document is placed. The paper width guides 7 position the original document in a paper width direction. Thepinion gear 8 is rotatably supported on a reverse surface of theoriginal document tray 6. Therack members pinion gear 8. The pair of themovable members rack members rack members movable members - The
original document tray 6 is a flat plate member that is made of plastic, resin etc. As illustrated inFIG. 1 , in order to reduce friction by reducing a contact area between theoriginal document tray 6 and the placed original document, a plurality ofribs 12 are arranged to protrude from the upper surface of theoriginal document tray 6 and extending in apaper feed direction 100 shown by an outlined arrow. As illustrated inFIGS. 1 and 2 , twoelongated holes 13 are formed penetrating through theoriginal document tray 6 and extend in a direction that is substantially perpendicular to thepaper feed direction 100. Theelongated holes 13 are provided at prescribed intervals in thepaper feed direction 100. In addition, position adjustment scales 14 for adjusting a position of the original document width guides 7 are displayed on the upper surface of theoriginal document tray 6 with prescribed intervals between each of the position adjustment scales 14 in a direction that is substantially perpendicular to thepaper feed direction 100. The position adjustment scales 14 are symmetrically provided with respect to a center of theoriginal document tray 6 so as to correspond to each of the original document width guides 7. Each distance between the corresponding position adjustment scales 14 is equal to a width of a standard sized paper. In the present preferred embodiment, paper sizes “B5”, “A4”, “B4”, and “A3” according to the Japanese Industrial Standards (JIS) are sequentially displayed outward from the center of theoriginal document tray 6. Both the number and the interval of the position adjustment scales 14 can be changed according to a type of corresponding paper sizes. In addition, for convenience of description, the position adjustment scales 14 to be displayed on the upper surface of theoriginal document tray 6 are shown on the reverse surface of theoriginal document tray 6 in each drawing. As illustrated inFIG. 2 , on the reverse surface of theoriginal document tray 6, guideribs 15 for guiding therack members paper feed direction 100. - As illustrated in
FIG. 1 , the pair of the original document width guides 7 is substantially L-shaped in its longitudinal cross-section. Each of the original document width guides 7 includes acontact portion 16, which makes contact with the upper surface of theoriginal document tray 6, and a standingportion 17, which projects from one side of thecontact portion 16 and controls one side edge of the original document in a paper width direction. Each of the original document width guides 7 is provided slidably in a direction that is substantially perpendicular to thepaper feed direction 100 on theoriginal document tray 6. In other words, as illustrated inFIG. 2 , each of the original document width guides 7 is respectively integrated with each of therack members member 18, and can slide within an area where the connectingmember 18 is guided along theelongated holes 13 of theoriginal document tray 6. Therefore, as illustrated inFIGS. 2 and 5 , by sliding each of the original document width guides 7 according to a size of the original document to be scanned, and by adjusting each inner wall surface of the standingportion 17 respectively to a correspondingposition adjustment scale 14, a distance between the standingportions 17 of the original document width guides 7 can conform with the size of the original document. In the present preferred embodiment, a pair of the original document width guides 7 is preferably provided, and both of the original document width guides 7 are slidable. However, the present invention is not limited to such an example. For example, a slidable originaldocument width guide 7 may be provided only at one side in a width direction of the original document, and a positioning wall member (not shown) or the like may be fixedly provided on the other side in the width direction of the original document. Accordingly, by sliding the originaldocument width guide 7, both sides of the original document in the width direction can be positioned. - As illustrated in
FIG. 6 , thepinion gear 8 includes a gearmain body 20 having a teethedportion 19 disposed around a circumference of a cylinder member, and a substantially disk-shapedflange 21 protruding in a radial direction of the gearmain body 20 located at one end of the gearmain body 20. Thepinion gear 8 also includes aboss inserting hole 22 penetrating through the gearmain body 20 and theflange 21. - As illustrated in
FIG. 6 , therack members portion 23 at one side of the flat plate member in a width direction. Aguide groove 24 is provided on each of therack members guide groove 24 is substantially semicircular in its longitudinal cross-section, and as illustrated inFIG. 2 , theguide groove 24 of each of therack members guide groove 24 of therack member 9A includes a firstparallel portion 25 and a secondparallel portion 26 that extend substantially parallel to a longitudinal direction of therack member 9A and are displaced in a width direction of therack member 9A. Theguide groove 24 of therack member 9A also includes adiagonal portion 27 that extends diagonally with respect to the longitudinal direction of therack member 9A and connects the first and the secondparallel portions guide groove 24 of therack member 9B includes a firstparallel portion 28, a secondparallel portion 29, and a thirdparallel portion 30 that extend substantially parallel to a longitudinal direction of therack member 9B and are connected by a firstdiagonal portion 31 and a seconddiagonal portion 32 both extending diagonally with respect to the longitudinal direction of therack member 9B. With the above-described structure, each of therack members members 18. - By detecting a position of the pair of the
movable members FIG. 6 , each of themovable members longitudinal portion 33, which is formed of a longitudinal member, and aflat plate portion 34, which laterally protrudes from one end in the longitudinal direction of thelongitudinal portion 33. On a bottom portion of thelongitudinal portion 33, aslide groove 35, which is substantially V-shaped in its longitudinal cross-section, is formed extending in the longitudinal direction of thelongitudinal portion 33. Afitting projection 36, which fits in theguide groove 24 of therack member longitudinal portion 33. On an upper surface of theflat plate portion 34, a projectingdetection portion 37 is provided parallel to thelongitudinal portion 33. - Next, a description will be made of an attachment structure of the
pinion gear 8, therack member 9B, and themovable member 10B to the reverse surface of theoriginal document tray 6. As illustrated inFIG. 6 , aslide rib 38, which is substantially in an inverted V-shape in its longitudinal cross-section in the direction that is substantially perpendicular to thepaper feed direction 100, is provided protruding from the reverse surface of theoriginal document tray 6. Themovable member 10B can be attached movably along theslide rib 38 by fitting theslide rib 38 in theslide groove 35 formed at the bottom portion of themovable member 10B. From above themovable member 10B, therack member 9B is attached between theguide ribs 15 shown inFIG. 2 such that thefitting projection 36 of themovable member 10B fits in theguide groove 24 of therack member 9B, and therack member 9B can slide along theguide rib 15. Accordingly, accompanying sliding movement of the originaldocument width guide 7 on the upper surface of theoriginal document tray 6, therack member 9B that is integrated with theoriginal document guide 7 slides on the reverse surface of theoriginal document tray 6. Moreover, as illustrated inFIG. 6 , thepinion gear 8 is attached from above therack member 9B. More specifically, agear attaching boss 40 with ascrew hole 39 is disposed on the reverse surface of theoriginal document tray 6. Thepinion gear 8 is attached such that thegear attaching boss 40 is inserted through theboss inserting hole 22, and the teethedportion 19 meshes with the teethedportion 23 of therack member 9B. Upon inserting theflange 21 into thegear attaching boss 40 until theflange 21 touches therack member 9B, thepinion gear 8 can be rotatably supported by screwing ascrew 41 into thescrew hole 39 of thegear attaching boss 40. - In the above-described structure, the pair of the original document width guides 7 slides in opposite directions with respect to one another. In other words, when one of the original document width guides 7 is slid in a direction that is substantially perpendicular to the
paper feed direction 100, therack member 9A, which is integrated with the originaldocument width guide 7, slides in the direction that is substantially perpendicular to thepaper feed direction 100 as well, and thepinion gear 8, which is meshed with therack member 9A, starts rotating. Accordingly, therack member 9B, which is meshed with thepinion gear 8, slides in the opposite direction of therack member 9A, and the other originaldocument width guide 7, which is integrated with therack member 9B, slides in the opposite direction of the former originaldocument width guide 7. - Furthermore, in the above-described structure, each of the
movable members rack member 9B, which is integrated with the originaldocument width guide 7, slides, thefitting projection 36 of therack member 9B starts moving along theguide groove 24. While thefitting projection 36 is moving along the firstparallel portion 28 of theguide groove 24, a force towards thepaper feed direction 100 does not act upon themovable member 10B. Therefore, only therack member 9B slides in the direction that is substantially perpendicular to thepaper feed direction 100 without moving themovable member 10B. However, when thefitting projection 36 reaches the firstdiagonal portion 31 of theguide groove 24, the force towards thepaper feed direction 100 acts upon themovable member 10B, and themovable member 10B starts moving along theslide rib 38 in a direction towards thepaper size sensor 11. Thefitting projection 36 then passes through the firstdiagonal portion 31, and reaches the secondparallel portion 29. Accordingly, since the force towards thepaper feed direction 100 stops acting upon themovable member 10B, themovable member 10B stops moving. In the above-described manner, accompanying the sliding movement of each of the original document width guides 7 in the direction that is substantially perpendicular to thepaper feed direction 100, each of themovable members paper feed direction 100. - The pair of the
paper size sensors 11 is used to determine the paper size of the original document by detecting or not detecting each of themovable members paper size sensor 11 is the same as the conventionalpaper size sensor 82, like reference numerals are used inFIGS. 6 and 9 , and a description thereof will be omitted. As illustrated inFIG. 6 , thepaper size sensor 11 is attached by fitting the snap-fits 86 of thepaper size sensor 11 into asensor mounting portion 42, which is provided on the reverse side of theoriginal document tray 6, under a state in which thepaper size sensor 11 is lies flat, i.e., under a state in which the height direction of thepaper size sensor 11, which is a direction in which the dimension of thepaper size sensor 11 is large, is arranged substantially parallel to theoriginal document tray 6. Accordingly, the light-emittingelement 83 and the light-receivingelement 84 face each other across a movement path of themovable member 10B. When the projectingdetection portion 37 of themovable member 10B is located away from thepaper size sensor 11, and light emitted from the light-emittingelement 83 is being received by the light-receivingelement 84, thepaper size sensor 11 sends an ON-signal to a control unit (not shown). On the other hand, while the projectingdetection portion 37 of themovable member 10B is located between the light-emittingelement 83 and the light-receivingelement 84, and light is not being received by the light-receivingelement 84, thepaper size sensor 11 sends an OFF-signal to the control unit. Thus, passage or non-passage of themovable members paper size sensors 11. - Accordingly, the
movable members paper feed direction 100, are detected by thepaper size sensor 11, and thepaper size sensor 11 can be attached to lie flat. In the above-described structure, the height of the original document tray unit 1 can be reduced as a whole compared with a structure in which thepaper size sensor 11 is attached such that the height direction of thepaper size sensor 11 extends in the height direction of theoriginal document tray 6. Therefore, the original document discharged from the paper discharge port, which is positioned directly under theoriginal document tray 6, can be prevented from touching the original document tray unit 1. Accordingly, since a long distance is not required to be provided between the paper feed port and the paper discharge port, the height of theADF 3 can be reduced as a whole. - With reference to
FIGS. 2 and 5 , description will be made of how the size of the original document in the paper width direction can be determined by thepaper size sensor 11. As illustrated inFIGS. 2 and 6 , for example, when each of the original document width guides 7 is adjusted to aposition adjustment scale 14 indicating A3 size, themovable member 10A has thefitting projection 36 located in the firstparallel portion 25 of therack member 9A and the projectingdetection portion 37 located between the light-emittingelement 83 and the light-receivingelement 84 of thepaper size sensor 11. Meanwhile, themovable member 10B has thefitting projection 36 located in the thirdparallel portion 30 of therack member 9B and the projectingdetection portion 37 located away from both the light-emittingelement 83 and the light-receivingelement 84 of thepaper size sensor 11. Therefore, the control unit determines that the original document placed on theoriginal document tray 6 is size A3 by receiving the OFF-signal from onepaper size sensor 11 and the ON-signal from the otherpaper size sensor 11. - When each of the original document width guides 7 is slid from a position illustrated in
FIG. 2 towards the center of theoriginal document tray 6, eachfitting projection 36 of themovable members guide groove 24 of therack members FIG. 3 , when each of the original document width guides 7 is adjusted to aposition adjustment scale 14 indicating B4 size, themovable member 10A is stopped with thefitting projection 36 still being located in the firstparallel portion 25 of therack member 9A. Accordingly, the projectingdetection portion 37 is located between the light-emittingelement 83 and the light-receivingelement 84. Meanwhile, accompanying movement of thefitting projection 36 of themovable member 10B from the thirdparallel portion 30 through the seconddiagonal portion 32 to the secondparallel portion 29 of therack member 9B, themovable member 10B moves in a direction close to thepaper size sensor 11, and the projectingdetection portion 37 is located between the light-emittingelement 83 and the light-receivingelement 84. Therefore, the control unit receives an ON-signal from bothpaper size sensors 11, and determines that the original document placed on theoriginal document tray 6 is size B4. - When each of the original document width guides 7 is slid from a position illustrated in
FIG. 3 towards the center of theoriginal document tray 6 to be adjusted to aposition adjustment scale 14 indicating A4 size as illustrated inFIG. 4 , themovable member 10A moves in a direction away from thepaper size sensor 11 accompanying movement of thefitting projection 36 from the firstparallel portion 25 through thediagonal portion 27 to the secondparallel portion 26 of therack member 9A, and the projectingdetection portion 37 moves away from a position between the light-emittingelement 83 and the light-receivingelement 84. Meanwhile, themovable member 10B is stopped with thefitting projection 36 still located in the secondparallel portion 29 of therack member 9B, and the projectingdetection portion 37 is located between the light-emittingelement 83 and the light-receivingelement 84. Therefore, the control unit receives the ON-signal from onepaper size sensor 11 and the OFF-signal from the otherpaper size sensor 11, and determines that the original document placed on theoriginal document tray 6 is size A4. - When each of the original document width guides 7 is slid from a position illustrated in
FIG. 4 towards the center of theoriginal document tray 6 to be adjusted to aposition adjustment scale 14 indicating B5 size as illustrated inFIG. 5 , thefitting projection 36 of themovable member 10A stays still in the secondparallel portion 26 of therack member 9A, and the projectingdetection portion 37 stays away from the position between the light-emittingelement 83 and the light-receivingelement 84. Meanwhile, themovable member 10B moves in a direction away from thepaper size sensor 11 accompanying movement of thefitting projection 36 from the secondparallel portion 29 through the firstdiagonal portion 31 to the firstparallel portion 28 of therack member 9B, and the projectingdetection portion 37 moves away from the position between the light-emittingelement 83 and the light-receivingelement 84. Therefore, the control unit receives the OFF-signal from bothpaper size sensors 11, and determines that the original document placed on theoriginal document tray 6 is size B5. - In the above-described preferred embodiment, a total of four types of paper sizes can be determined by the two
paper size sensors 11 by detecting the passing or non-passing of themovable members paper size sensors 11 can be increased or decreased, or a plan view of theslide grooves 35 formed on therack members -
FIG. 7 is a schematic plan view of a structure of a reverse surface of the originaldocument tray unit 50 according to a second preferred embodiment of the present invention, illustrating a state in which the original document width guides 7 are adjusted to theposition adjustment scale 14 indicating A4 size. Compared to the original document tray unit 1 of the first preferred embodiment, the structures ofrack members movable members document tray unit 50. Since the structure of other members are the same as the structure described in the first preferred embodiment, like reference numerals are used inFIGS. 2 and 7 , and a description thereof will be omitted. In the second preferred embodiment, instead of providing theguide grooves 24 on each of therack members portions 53 are respectively disposed on a side of each of therack members portion 23 is provided. Each of the cut-outportions 53 of therack members movable members movable members original document tray 6, and an intermediate portion of themovable members rack members movable members portions 53 of therack members movable members element 83 and the light-receivingelement 84 of thepaper size sensor 11. When therack members movable members portions 53, the leading end of themovable members paper size sensor 11 and moves away from the position between the light-emittingelement 83 and the light-receivingelement 84. Therefore, the control unit receives the ON-signal from onepaper size sensor 11 and the OFF-signal from the otherpaper size sensor 11, and determines that the original document placed on theoriginal document tray 6 is size A4. Although not illustrated in the drawings, in the same manner as the first preferred embodiment, accompanying the sliding movement of each of the original document width guides 7, each of themovable members paper feed direction 100 at different timings, and the ON/OFF-signals from thepaper size sensor 11 change accordingly. Accordingly, the paper size of the original document placed on theoriginal document tray 6 can be determined. - While the present invention has been described with respect to preferred embodiments thereof, it will be apparent to those skilled in the art that the disclosed invention may be modified in numerous ways and may assume many embodiments other than those specifically set out and described above. Accordingly, the appended claims are intended to cover all modifications of the present invention that fall within the true spirit and scope of the present invention.
Claims (20)
1. A paper tray unit comprising:
a paper tray on which a paper to be fed into a paper transportation path is placed and in which a paper discharge port of the paper transportation path is provided directly under the paper tray;
a paper width guide provided movably in a direction that is substantially perpendicular to a paper feed direction on an upper surface of the paper tray and arranged to position the paper in a paper width direction;
a paper size sensor attached to a reverse surface of the paper tray and arranged to determine a size of the paper in the paper width direction by detecting a position of the paper width guide; and
a movable member arranged to move in the paper feed direction accompanying the movement of the paper width guide.
2. The paper tray unit according to claim 1 , wherein a height of the paper size sensor protruding from the reverse surface of the paper tray is within a range in which a paper discharged from the paper discharge port does not touch the paper size sensor.
3. The paper tray unit according to claim 2 , wherein the paper size sensor is a transmissive optical sensor which emits a light beam across a detection groove through which the movable member passes.
4. The paper tray unit according to claim 3 , wherein the paper size sensor has a maximum dimension in a height direction of the detection groove and is attached such that the height direction of the detection groove is substantially parallel to the paper tray unit.
5. The paper tray unit according to claim 4 , wherein each of the paper width guide, the paper size sensor, and the movable member include a pair of paper width guides, a pair of paper size sensors, and a pair of movable members; the paper tray unit includes a pair of rack members integral with the pair of the paper width guides; and the pair of the movable members moves in a direction that is substantially perpendicular to a moving direction of the rack members in response to a movement of the rack members, and a paper size is determined by the pair of the paper size sensors detecting a position of the movable members.
6. The paper size sensor according to claim 5 , wherein the pair of the paper width guides is integral with the pair of the rack members via a respective connecting member, and is slidable on the paper tray within a range in which the connecting member is guided along an elongated hole provided on the paper tray.
7. The paper tray unit according to claim 6 , wherein the pair of the rack members includes a longitudinal flat plate member and a teethed portion provided at one side in a width direction of the flat plate member.
8. The paper tray unit according to claim 7 , wherein a guide groove is provided along a longitudinal direction of each of the rack members, each guide groove is substantially semicircular in a longitudinal cross-section, and each guide groove has a different planar shape.
9. The paper tray unit according to claim 8 , wherein the guide groove of a first rack member of the pair of rack members includes a first parallel portion and a second parallel portion extending parallel to the longitudinal direction of the first rack member, the first and the second parallel portions are displaced in a width direction of the first rack member, and a diagonal portion extending diagonally in the longitudinal direction of the first rack member is provided to connect the first parallel portion and the second parallel portion; and
the guide groove of a second rack member of the pair of rack members includes a first parallel portion, a second parallel portion and a third parallel portion extending parallel to the longitudinal direction of the second rack member; and a first diagonal portion and a second diagonal portion extending diagonally in the longitudinal direction of the second rack member are provided to connect the first parallel portion, the second parallel portion, and the third parallel portion.
10. The paper tray unit according to claim 9 , wherein a pinion gear is rotatably supported on the reverse surface of paper tray; and the pinion gear includes a gear main body and a substantially disk-shaped flange, the gear main body has a teethed portion formed around a circumference of a cylinder member, the flange is provided at one end of the gear main body and protrudes in a radial direction of the gear main body, and a boss inserting hole is provided through the gear main body and the flange.
11. The paper tray unit according to claim 10 , wherein the teethed portions of the rack members and the teethed portion of the pinion gear are meshed with each other, and when the teethed portions of the rack members and the teethed portion of the pinion gear are meshed, the pair of the paper width guides move simultaneously in opposite directions.
12. The paper tray unit according to claim 11 , wherein each of the movable members includes a longitudinal portion, a flat plate portion, a fitting projection, and a projecting detection portion; the longitudinal portion includes a longitudinal member, the flat plate portion laterally protrudes from one end of the longitudinal portion, the fitting projection protrudes from a top portion of the longitudinal portion and fits in the guide groove of the rack member, and the projecting detection portion is provided on an upper surface of the flat plate portion.
13. The paper tray unit according to claim 12 , wherein a substantially V-shaped slide groove is provided on a bottom portion of the longitudinal portion of the movable member and extends in the longitudinal direction of the longitudinal portion.
14. The paper tray unit according to claim 13 , wherein the pair of the paper size sensors includes snap-fits arranged to fit into sensor mounting portions provided on the reverse surface of the paper tray.
15. The paper tray unit according to claim 7 , wherein the pair of the rack members includes a shaped cut-out portion arranged on an opposite side in the width direction of the flat plate member from the teethed portion.
16. The paper tray according to claim 15 , wherein the cut-out portion on one of the pair of the rack members has a different planar shape from the cut-out portion on the other of the pair of rack members.
17. The paper tray unit according to claim 16 , wherein the pair of the movable members include blade springs made of a bent metal plate, a base end portion of the movable members is attached to the reverse surface of the paper tray, and an intermediate portion of each of the movable members in a longitudinal direction contacts against a respective cut-out portion of the pair of the rack members.
18. The paper tray unit according to claim 17 , wherein a pinion gear is rotatably supported on the reverse surface of the paper tray, the pinion gear including:
a gear main body having a teethed portion arranged around a circumference of a cylinder member;
a substantially disk-shaped flange provided at one end of the gear main body and protruding in a radial direction of the gear main body; and
a boss inserting hole penetrating through the gear main body and the flange.
19. The paper tray unit according to claim 18 , wherein the pair of the paper width guides are arranged to move by the teethed portion of the flat plate member meshing with the teethed portion disposed around the circumference of the cylinder member.
20. The paper tray according to claim 19 , wherein the pair of the paper size sensors includes snap-fits arranged to fit into sensor mounting portions provided on the reverse surface of the paper tray.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006041920A JP4273429B2 (en) | 2006-02-20 | 2006-02-20 | Paper tray unit |
JP2006-041920 | 2006-02-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070194517A1 true US20070194517A1 (en) | 2007-08-23 |
Family
ID=38427394
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/670,093 Abandoned US20070194517A1 (en) | 2006-02-20 | 2007-02-01 | Paper tray unit |
Country Status (3)
Country | Link |
---|---|
US (1) | US20070194517A1 (en) |
JP (1) | JP4273429B2 (en) |
CN (1) | CN101024453B (en) |
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US20070200288A1 (en) * | 2006-02-28 | 2007-08-30 | Kyocera Mita Corporation | Sheet feed tray and image forming apparatus |
US20070228635A1 (en) * | 2006-03-31 | 2007-10-04 | Canon Kabushiki Kaisha | Sheet feeding device and image forming apparatus |
US20080292382A1 (en) * | 2007-05-25 | 2008-11-27 | Brother Kogyo Kabushiki Kaisha | Guide devices and image processing apparatus |
US20110169215A1 (en) * | 2010-01-08 | 2011-07-14 | Samsung Electronics Co., Ltd | Paper feeding device and image forming apparatus having the same and control method thereof |
US20120080839A1 (en) * | 2010-09-30 | 2012-04-05 | Brother Kogyo Kabushiki Kaisha | Document holding device for an image processing system |
US8387972B1 (en) | 2012-03-05 | 2013-03-05 | Xerox Corporation | Paper present sensing for a paper tray through media size sensing board |
US8985572B2 (en) * | 2013-08-22 | 2015-03-24 | Kyocera Document Solutions Inc. | Sheet loading unit, sheet transport device, and image forming apparatus including the same |
US9400473B1 (en) | 2015-07-21 | 2016-07-26 | Xerox Corporation | Variable capacity paper tray |
JP2021024663A (en) * | 2019-07-31 | 2021-02-22 | キヤノン株式会社 | Feeding device and recording device |
US11474470B2 (en) | 2019-06-05 | 2022-10-18 | Canon Kabushiki Kaisha | Sheet feeding apparatus and image forming apparatus |
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JP5207831B2 (en) * | 2008-05-29 | 2013-06-12 | キヤノン株式会社 | Sheet feeding apparatus and image forming apparatus |
US7942414B2 (en) * | 2008-06-16 | 2011-05-17 | Kabushiki Kaisha Toshiba | Image forming apparatus and method of managing discharged sheets |
JP2012090085A (en) * | 2010-10-20 | 2012-05-10 | Seiko Epson Corp | Image reading apparatus |
JP6019086B2 (en) * | 2014-10-29 | 2016-11-02 | 京セラドキュメントソリューションズ株式会社 | Paper feeding device and image forming apparatus |
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US8985572B2 (en) * | 2013-08-22 | 2015-03-24 | Kyocera Document Solutions Inc. | Sheet loading unit, sheet transport device, and image forming apparatus including the same |
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Also Published As
Publication number | Publication date |
---|---|
CN101024453A (en) | 2007-08-29 |
CN101024453B (en) | 2012-06-27 |
JP4273429B2 (en) | 2009-06-03 |
JP2007217160A (en) | 2007-08-30 |
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