JPH0532344U - Sheet transport device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent double feed of sheets by preventing biting of the sheets to the separating portion when the sheets are set in the sheet storing portion without providing a stopper for advancing and retracting. [Arrangement] The leading end of the original set on the original tray 11 is guided by a guide portion 14A in a direction different from the separating portion 34 direction, and the leading end of the original is regulated by a regulating portion 26A so that the original is separated when the original is set. 34, and a feeding roller 19 driven to a position in which the document stored in the document tray 11 is not in contact with the document and a position in which the document comes into contact with the document and feeds the document. By driving to the feeding position, it is possible to move the leading edge of the document regulated by the regulation unit 26A to the position for guiding in the direction of the separation unit 34.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sheet conveying device used for a document conveying device of an image processing apparatus such as a copying machine, an image reader, and a facsimile.

[0002]

[Prior Art]

 2. Description of the Related Art Conventionally, in a document feeder used in a copying machine or the like, a document set on a document tray is separated into one sheet by a separating section, the document is conveyed to a copy position, and is ejected after copying.

The separating unit includes a paper feeding unit for conveying the original document and a separating unit for retracting the original document following the original document conveyed by the paper feeding unit. When the original document is set on the original tray, the original document is set. Multiple sheets of paper may be caught between the paper feeding means and the separating means, causing double feed.

In particular, when the separating means is a fixed roller or pad, when the third document enters the separating section, the second document is fed.

For this reason, a stopper that can move back and forth is provided in front of the separating portion, the front end of the original is received by the stopper when the original is set, and the stopper is retracted at the start of conveyance so that the original is supplied to the separating portion.

[0006]

[Problems to be solved by the device]

 In such a structure, a driving mechanism for the stopper is necessary, which complicates the structure.

The purpose of the present invention is to prevent double feeding of sheets by preventing the sheets from biting into the separating portion when the sheets are set in the sheet storing portion such as a document tray without providing a stopper for advancing and retracting. The purpose is to obtain a sheet conveying device that can perform.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention guides the front end of the sheet set in the sheet accommodating portion in a direction different from the separating portion direction by the guide means, and regulates the front end of the sheet by the regulating means. When the sheet is set, the sheet is prevented from reaching the separating portion, and the sheet feeding means that is driven to a position where the sheet is not in contact with the sheet stored in the sheet storing portion and a position where the sheet is brought out by coming into contact with the sheet are provided on the sheet. By driving the sheet from the contact position to the position for feeding the sheet, the sheet leading edge regulated by the regulating means is moved to a position for guiding the sheet toward the separating portion.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

<Structure> This embodiment will be described by taking an image reader 1 with a document feeder as an example as shown in FIG. The image reader 1 includes a conveyance unit 2 that conveys a document and a reading unit 3 that reads an image of the document conveyed to the conveyance unit 2.

The transport unit 2 includes a document tray 11 rotatably attached to a case 4 about a shaft 10, and a pair of side plates that regulate both sides of a document set on the document tray 11 and fed to a guide 5. 12, a conveyance guide 14 that forms a conveyance path 13 for a document, a conveyance cover 16 that can be opened / closed around a shaft 15, and a discharge tray 17 that is detachable.

Further, an empty sensor 18 (consisting of a lever 18A and a detector 18B) for detecting whether a document is set on the document tray 11 and a document set on the document tray 11. It is composed of a non-circular feeding roller 19 for feeding the bottom sheet, a paper feeding means for feeding the document fed by the feeding roller 19, for example a paper feeding roller 20, and a registration sensor 21 (a lever 21A and a detecting portion 21B). , A registration roller 22, a platen glass 23, and a paper discharge roller 24.

The feeding roller 19 is provided with an arcuate portion 19A that comes into contact with the original P and sends out the original P, and a non-circular arc portion 19B that retreats downward from the conveyance guide 14 and does not come into contact with the original P.

Further, the transport cover 16 includes a paper feed guide 26 that forms a paper feed port 25, a pressing member 27 that presses an original document, and a separating means such as a separation roller 28 that retracts the original document conveyed by the paper feed roller 20. A registration guide 29 for forming a space for bending the original, a roller 30 pressed against the registration roller 22, a white member 32 opposed to the platen glass 23, and a roller 33 pressed against the discharge roller 24 are provided. ing.

The paper feed roller 20 and the separation roller 28 form a separation unit 34.

On the other hand, the reading unit 3 includes a light source 40 such as a fluorescent lamp or a light emitting diode that irradiates a document conveyed along the platen glass 23 with light, and mirrors 41, 42 and 43 that reflect the light from the document. , A photoelectric conversion element 44 such as a CCD for receiving light from the mirror 43 and converting it into an electric signal.

A drive mechanism as shown in FIG. 2, FIG. 3, and FIG. 4 is provided in the transport unit 2, and the feed roller 19, the paper feed roller 20, and the separation roller 28 are shown in solid lines by the forward rotation of the pulse motor 50. It is configured to be driven in the direction of the arrow and reversely drive the registration roller 22 and the discharge roller 24 in the direction of the broken arrow.

First, as shown in FIG. 3, a pulley 52 is provided on a rotary shaft 52 of a motor 50, and the pulley 52 and a pulley 54 attached to a shaft 53 are connected by a timing belt 55.

A gear 56 is attached to the shaft 53 and meshes with a gear 57 attached to the shaft 57. A gear 60, which meshes with the gear 58, is attached to the rotary shaft 59 of the paper feed roller 20 via a one-way clutch. Gears 61 and 62 are mounted on both sides of the rotary shaft 59 as shown in FIG. 2. The gear 61 meshes with a gear 64 mounted on a shaft 63, and the gear 62 meshes with a gear 66 mounted on a shaft 65. It

A gear 67 and an initial position detecting member 68 are further attached to the rotary shaft 59, the gear 67 meshes with a gear 70 attached to the shaft 69, and the gear 70 is the rotary shaft 71 of the feeding roller 19. It meshes with a gear 72 attached to the.

Further, the initial position detecting member 68 is detected by the sensor 73, and detects the initial position of the feeding roller 19.

As shown in FIG. 4, a gear 75 meshing with the gear 64 of FIG. 2 and a gear 76 meshing with the gear 66 of FIG. 2 are attached to both ends of the rotary shaft 74 of the separation roller 28.

As shown in FIG. 2, a gear 78 that meshes with the gear 56 is attached to a rotary shaft 77 of the registration roller 22 via a one-way clutch, and a pulley 79 is fixed.

A pulley 81 is attached to the rotary shaft 80 of the paper discharge roller 24, and a timing belt 84 is attached together with the pulley 83 attached to the shaft 82 and the pulley 79.

As shown in FIG. 4, the rotary shaft 85 of the roller 30 and the rotary shaft 86 of the roller 33 are biased by the leaf spring 87, and the rollers 30 and 33 are pressed against the rollers 22 and 24.

In the above-described structure, particularly in this embodiment, as shown in FIG. 5, the paper feed guide 26 is provided with a regulating means, for example, a guide portion 26A, which is inclined in front of the separation roller 28, and the transport guide 14 is provided with the original tray 11. A guide means, for example, a guide portion 14A, is formed so as to guide the leading end of the document P set to the guide 26A.

<Operation> When the original tray 11 is expanded and the original P is set on the original tray 11 as shown in FIG. 1, the empty sensor 18 detects the original P. At the time of setting the original document, as shown in FIG. 5, the original document P has its leading end directed upward by the guide portion 14A, is abutted against the regulation portion 26A, and is prevented from entering the conveyance path 13.

Next, when a paper feed instruction signal is supplied to the scanner 1 from a control device (not shown) such as a computer, the light source 40 is turned on and the pulse motor 50 is normally rotated. Therefore, the paper feed roller 20, the separation roller 28, and the feeding roller 19 are rotated in the direction of the solid line arrow. Since the one-way clutch is interposed in the gear 78, the register roller 22 and the paper discharge roller 24 do not rotate.

When the feeding roller 19 rotates, the circular arc portion 19A projects from the conveyance guide 14 as shown in FIG. 6, and the document P is lifted. For this reason, the leading edge of the document is lowered and the leading edge of the document faces the transport path 13. When the feeding roller 19 further rotates, the non-circular arc portion 19B opposes the document P, and the document P moves down. In this way, when the arc portion 19A comes into contact with the document P, the bottom sheet is fed out.

On the other hand, since the paper feed roller 20 and the separation roller 28 are also rotating, the document P fed by the feeding roller 19 is separated into one sheet.

The separated original is detected by the sensor 21, and after the detection, the original is conveyed by a predetermined amount (for a predetermined time or a predetermined number of pulses of the pulse motor 50), and the front end of the original is conveyed to the register roller 22 and the roller 30. The document is deflected by hitting it between and correcting the skew of the document edge (skew correction).

Next, the pulse motor 50 is stopped after a lapse of time for completing the skew correction, and this time the motor is reversed. The reverse rotation of the Hulls motor 50 causes the registration roller 22 and the paper discharge roller 24 to rotate in the direction of the broken arrow. Since the one-way clutch is interposed in the gear 60, the feeding roller 19, the paper feeding roller 20, and the separation roller 28 do not rotate.

When the registration roller 22 conveys the document by a predetermined amount and the leading edge of the document reaches the reading start position, the photoelectric conversion element 44 starts image input of the document. The image input ends when the predetermined area is read.

After the sensor 21 detects the trailing edge of the original, when the trailing edge of the original is conveyed by an amount passing through the paper discharge roller 24, the pulse motor 50 is stopped. If the original is still set on the original tray 11, the empty sensor 18 has detected the original, so the pulse motor 50 is rotated in the normal direction to feed the next original and input the image. This operation is repeated until the empty sensor 18 no longer detects the document.

<Effects of Embodiment> According to the embodiment described above, the leading end of a document set on the document tray 11 is guided by the guide portion 14A in a direction different from the direction of the separating portion 34, and the leading end of this document is guided. The document is regulated by the regulation section 26A to prevent the document from reaching the separating section 34 when the document is set, and is driven to a position where the document stored in the document tray 11 is not in contact with the document and a position where the document is fed out by contacting the document. By driving the feeding roller 19 to move the document from a position not in contact with the document to a position for feeding the document, the leading end of the document regulated by the regulation unit 26A can be moved to a position to guide the document toward the separating unit 34. For this reason, even if a stopper for advancing and retracting is not provided, it is possible to prevent the document from sticking to the separating portion 34 when the document is set on the document tray 11 and reduce the double feeding of the document.

<Modification> One embodiment of the present invention has been described above, but the present invention is not limited to the above-mentioned embodiment, and the following modifications can be made.

(1) In the above embodiment, the document is fed by the feeding roller 19 having a non-circular cross section, but as shown in FIG. 7, the circular roller 100 is supported movably up and down via the arm 01. However, it may be made to appear and disappear from the transport guide 14.

(2) In the above-described embodiment, the separating roller 28 that rotates in the direction opposite to the document conveying direction is shown as the separating means. However, as shown in FIG. 7, a non-rotating roller 102 or a fixed rubber pad or other friction member is used. You may make it separate. Further, the paper feeding means and the separating means may be belts or the like. Further, a roller, a friction member, a belt or the like may be combined.

(3) In the above embodiment, the paper feed roller 20 and the separation roller 28 are arranged in contact with each other, but the feed roller and separation roller may be alternately arranged in a non-contact state.

(4) In the above embodiment, the guide portion 14 A having the guide 14 projected is shown as the guide means. However, as shown in FIG. 7, the leading end of the original set on the current tray 11 is not defined as the separation portion 34 direction. An elastic member 103 such as an elastically deformable synthetic resin sheet that guides in different directions may be used.

(5) In the above embodiment, the document feeder for feeding the document from the lowermost paper is shown, but the invention can be applied to the one which feeds the original from the uppermost paper. For example, as shown in FIG. 8 and FIG. 9, a spring 106 urges a guide plate 105 that guides the leading edge of a document set on a document tray 104 having a recess 104A in a direction different from the direction of the separating portion 34 by a spring 106. The leading end of the document guided by the guide plate 105 is regulated by the regulation portion 26A, and the feeding roller 10 is driven to a position where the document is not in contact with the document stored in the document tray 104 and a position where the document is fed out by contacting the document. Is supported by an arm 108 so as to be movable up and down, and is regulated by the regulation portion 26A by driving the feeding roller 107 from a position not in contact with the document as shown in FIG. 8 to a position for feeding the document as shown in FIG. The leading edge of the document is moved to a position where it is guided in the direction of the separating section 34, and the document P is fed by the feeding roller 107.

[0042]

[Effect of the device]

 As described above, according to the present invention, the leading end of the sheet set in the sheet accommodating portion is guided by the guide means in a direction different from the separating portion direction, and the leading end of the sheet is regulated by the regulating means so that the sheet is set when the sheet is set. To prevent the sheet from reaching the separating section, and to feed the sheet stored in the sheet storing section to a position where the sheet is not in contact with the sheet and a position where the sheet is fed out to contact the sheet and to feed the sheet from the position not in contact with the sheet. By driving to the position where the sheet is fed out, the sheet leading edge regulated by the regulation means is moved to a position where it guides in the direction of the separating portion. It is possible to prevent the sheets from sticking to the separation part of the sheet and reduce the double feeding of the sheets.

[Brief description of drawings]

FIG. 1 is a sectional view showing a structure of an image reader according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a structure of a carrying section of FIG.

FIG. 3 is a cross-sectional view showing the structure of the drive mechanism shown in FIG.

FIG. 4 is a cross-sectional view showing a structure of a carrying section of FIG.

5 is a cross-sectional view showing the structure of the container portion of FIG.

FIG. 6 is a cross-sectional view showing the operating state of the figure.

FIG. 7 is a sectional view showing a modified example of the present invention.

FIG. 8 is a sectional view showing a modified example of the present invention.

9 is a cross-sectional view showing the operating state of FIG.

[Explanation of symbols]

 1 Image Reader 2 Conveying Section 3 Reading Section 11 Original Tray 14 Conveying Guide 16 Conveying Cover 17 Paper Ejection Tray 19 Feeding Roller 19 20 Paper Feeding Roller 22 Registration Roller 23 Platen Glass 24 Paper Ejecting Roller 27 Pressing Member 28 Separation Roller

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical display location G03G 15/00 107 8530-2H H04N 1/00 108 H 4226-5C

Claims (1)

[Scope of utility model registration request] 1. A sheet conveying device having a sheet accommodating portion for accommodating a plurality of sheets, and a separating portion for separating the sheets accommodated in the sheet accommodating portion into one sheet and feeding the sheet into the sheet accommodating portion. Guide means for guiding the leading edge of the conveyed sheet in a direction different from the separating portion direction, regulating means for regulating the leading edge of the sheet guided by the guide means, and non-contact with the sheet accommodated in the sheet accommodating portion. Is driven to the position where
A sheet conveying device comprising: a feeding unit that drives the sheet from a position not in contact with the sheet to a position to feed the sheet to a position that guides the sheet front end regulated by the regulating unit toward the separating portion. ..