CN113281970A - Image processing apparatus and paper feeding method - Google Patents

Image processing apparatus and paper feeding method Download PDF

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Publication number
CN113281970A
CN113281970A CN202110009345.3A CN202110009345A CN113281970A CN 113281970 A CN113281970 A CN 113281970A CN 202110009345 A CN202110009345 A CN 202110009345A CN 113281970 A CN113281970 A CN 113281970A
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CN
China
Prior art keywords
paper
roller
sheet
tray
image processing
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Granted
Application number
CN202110009345.3A
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Chinese (zh)
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CN113281970B (en
Inventor
八幡伊佐雄
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Toshiba TEC Corp
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Toshiba TEC Corp
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Publication of CN113281970A publication Critical patent/CN113281970A/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6529—Transporting
    • 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
    • B65H1/08—Supports or magazines for piles from which articles are to be separated with means for advancing the articles to present the articles to the separating device
    • B65H1/12—Supports or magazines for piles from which articles are to be separated with means for advancing the articles to present the articles to the separating device comprising spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/08—Separating articles from piles using pneumatic force
    • B65H3/10—Suction rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/06—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers
    • B65H5/068—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers between one or more rollers or balls and stationary pressing, supporting or guiding elements
    • 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

Abstract

Embodiments of the present invention relate to an image processing apparatus and a sheet feeding method. The image processing apparatus includes a sheet tray, a pickup roller, a sheet feeding roller, an elevating mechanism, and a control device. The paper tray is used for loading paper. The pickup roller nips the sheet with the sheet tray to perform pickup. The paper feed roller conveys the paper picked up by the pickup roller. The lifting mechanism can lift the paper tray to a lifting position where the pick-up roller contacts with the paper and a lowering position lower than the lifting position. The control device controls the lifting mechanism to move the paper tray to the descending position when the paper feeding roller conveys the paper.

Description

Image processing apparatus and paper feeding method
Technical Field
Embodiments of the present invention relate to an image processing apparatus.
Background
An image processing apparatus having a manual tray, such as an MFP (Multi-Function Peripherals), a printer, or a copier, can print sheets loaded on the manual tray. Further, the image processing apparatus can print paper different from plain paper, such as thick paper and envelopes, using a manual tray.
A conventional image processing apparatus having a manual tray may include an elevating mechanism for moving a sheet to a sheet feeding position by raising a part of the manual tray. However, even in the case of the conventional image processing apparatus having the manual tray, the conveyance path of the sheet conveyed from the manual tray is not necessarily optimal even when the lifting mechanism is provided.
Disclosure of Invention
An image processing apparatus according to an embodiment includes: a paper tray for loading paper; a pickup roller that nips the sheet with the sheet tray to perform pickup; a paper feed roller that conveys the paper picked up by the pickup roller; a lifting mechanism capable of lifting the paper tray to a lifting position where the pickup roller contacts the paper and a lowering position lower than the lifting position; and a control device that controls the lifting mechanism to move the paper tray to the lowered position when the paper feeding roller conveys the paper.
Drawings
Fig. 1 is an overall configuration diagram of an image processing apparatus according to a first embodiment.
Fig. 2 is a functional configuration diagram of the image processing apparatus.
Fig. 3 is a sectional view of a paper feeding section of the image processing apparatus.
Fig. 4 is a perspective view of a manual tray of the image processing apparatus.
Fig. 5 is a perspective view of a manual tray of the image processing apparatus.
Fig. 6 is a perspective view of the manual tray at a position of contact with the pickup roller.
Fig. 7 is a perspective view of the elevating mechanism of the image processing apparatus.
Fig. 8 is a sectional view of a paper feeding portion of the image processing apparatus that conveys paper.
Fig. 9 is a sectional view of the paper feeding portion when the first paper sensor detects paper.
Fig. 10 is a cross-sectional view of a paper feed portion that conveys paper in the image processing apparatus according to the second embodiment.
Fig. 11 is a sectional view of the paper feeding portion when the second paper sensor detects paper.
Fig. 12 is a cross-sectional view of the paper feeding portion showing a positional relationship between the paper feeding roller and the conveying roller.
Detailed Description
An image processing apparatus according to an embodiment includes a sheet tray, a pickup roller, a sheet feeding roller, an elevating mechanism, and a control device. The paper tray is used for loading paper. The pickup roller nips the sheet with the sheet tray to perform pickup. The paper feed roller conveys the paper picked up by the pickup roller. The lifting mechanism can lift the paper tray to a lifting position where the pick-up roller contacts with the paper and a lowering position lower than the lifting position. When the sheet feeding roller conveys the sheet, the control device controls the elevating mechanism to move the sheet tray to the lowered position.
Hereinafter, an image processing apparatus of an embodiment will be described with reference to the drawings.
In the present application, the X direction, the Y direction, and the Z direction are defined as follows. The Y direction is a width direction (rotation axis direction) of the conveying roller. The Z direction is a vertical up-down direction. The X direction is a horizontal direction, and is a direction perpendicular to the Y direction and the Z direction.
(first embodiment)
Fig. 1 is an overall configuration diagram of an image processing apparatus 200 according to a first embodiment.
The image processing apparatus 200 according to the first embodiment is, for example, an MFP (Multi-Function Peripherals), a printer, a copier, or the like. An example of a case where the image processing apparatus 200 is an MFP shown in fig. 1 will be described below.
Fig. 2 is a functional configuration diagram of the image processing apparatus 200.
The image processing apparatus 200 includes: a controller 10, an operation unit 20 having a touch panel, a paper feed cassette 30, a paper feed unit 40, a scanner unit 50, an image processing unit 51, a printer unit 60, a fixing unit 90, a paper discharge unit 91, and a manual tray 100.
The controller (control device) 10 controls the operations of the respective device sections of the image processing apparatus 200 based on an operation input from the operation unit 20. For example, the controller 10 has a CPU, a Read Only Memory (ROM), a Random Access Memory (RAM), an input-output interface, an input-output control circuit, a paper feed/conveyance control circuit, an image formation control circuit, and a fixing control circuit.
The sheet feed cassette 30 is a tray that can be pulled out in the Y direction, and contains unused sheets P. The sheets P stored in the sheet cassette 30 are supplied to the printing unit 60 via the sheet feeding unit 40.
Fig. 3 is a sectional view of the paper feed unit 40.
The paper feed unit 40 conveys the paper P from the paper feed cassette 30 and the manual feed tray 100 to the printing unit 60. The paper feed unit 40 includes a paper feed roller 41 for a paper feed cassette, a pickup roller 42, a paper feed roller 43, a separation roller 44, a conveyance roller 45, a registration roller 46, a first paper sensor 47, and a second paper sensor 48.
The sheet feeding roller 41 for the sheet feeding cassette feeds the sheets P one by one from the sheet feeding cassette 30 to the transport roller 45 in accordance with the timing of forming the toner image by the printing portion 60.
The pickup roller 42 picks up the sheets P loaded on the sheet tray 102 of the manual tray 100 and conveys them to the sheet feed roller 43. As shown in fig. 3, the sheet P is nipped between the sheet tray 102 and the pickup roller 42. The paper P sandwiched between the paper tray 102 and the pickup roller 42 is conveyed to the paper feed roller 43 by the rotation of the pickup roller 42.
The paper feed roller 43 conveys the paper P picked up by the pickup roller 42 to the conveyance path R. A belt (not shown) is wound around pulleys provided in the paper feed roller 43 and the pickup roller 42, respectively. The pickup roller 42 is rotated in conjunction with the paper feed roller 43 in the same direction by the belt.
The separation roller 44 is disposed below the paper feed roller 43 so as to face the paper feed roller 43. The separation roller 44 is provided so as to be able to contact or separate from the sheet P conveyed by the sheet feed roller 43. The rotational driving direction of the separation roller 44 is the same as the rotational direction of the paper feed roller 43. The separation roller 44 has a torque limiter 44 f. The torque limiter 44f prevents overlapped conveyance of the paper P at the time of paper feeding.
The transport roller 45 is a roller disposed on the transport path R of the sheet P at a position downstream of the paper feed roller 43 in the transport direction. The conveying roller 45 corrects the traveling path of the sheet P conveyed by the sheet feeding roller 43, and conveys the sheet P to the registration roller 46. The conveying roller 45 is, for example, a pair of rollers, and conveys the sheet P therebetween. The feed roller 45 may not be provided in the paper feed portion 40, and the paper P fed by the paper feed roller 43 may be directly fed to the registration roller 46.
The registration roller 46 is a roller disposed on the downstream side in the conveying direction of the paper feeding roller 43 and the conveying roller 45 on the conveying path R of the paper P, and is one type of conveying roller. The registration rollers 46 align the position of the leading end of the paper P in the conveying direction by deflecting the paper P at the nip. The registration rollers 46 convey the sheet P in accordance with the timing at which the printing section 60 transfers the toner image to the sheet P.
The first sheet sensor 47 detects the sheet P conveyed by the sheet feed roller 43. The first sheet sensor 47 detects the sheet P with a photo interrupter or the like. The first paper sensor 47 is disposed on the conveyance path R of the paper P at a position downstream of the paper feed roller 43 in the conveyance direction. The first paper sensor 47 may be disposed on the paper P conveyance path R closer to the pickup roller 42 than the paper feed roller 43.
The second paper sensor 48 detects the paper P conveyed by the conveying roller 45. The second sheet sensor 48 detects the sheet P with a photo interrupter or the like. The second paper sensor 48 is disposed on the downstream side of the conveying rollers 45 in the conveying direction on the conveying path R of the paper P. The second paper sensor 48 may be disposed on the paper feed roller 43 side of the transport roller 45 on the transport path R of the paper P.
When the transport roller 45 is not provided to the paper feed unit 40, the second paper sensor 48 detects the paper P transported by a roller such as the registration roller 46 disposed on the transport path R on the downstream side in the transport direction from the paper feed roller 43.
The scanner 50 reads an image formed on a sheet P to be scanned. For example, the scanner unit 50 reads an image on the sheet P and generates image data of three primary colors of red (R), green (G), and blue (B). The scanner unit 50 outputs the generated image data to the image processor 51.
The image processing unit 51 converts the image data generated by the scanner unit 50 and the image data generated by a personal computer or the like into color signals of the respective colors. For example, the image processing section 51 converts the image data into image data (color signals) of four colors of yellow (Y), magenta (M), cyan (C), and black (K).
The printing unit 60 forms an output image (hereinafter referred to as a "toner image") with toner (developer) based on the image data received from the image processing unit 51. The printing portion 60 transfers the toner image onto the surface of the paper P. As shown in fig. 2, the printing section 60 has a toner cartridge 62, an image forming section 70, and a transfer unit 80.
As shown in fig. 1, the printing section 60 has a front cover 61 as a housing. The front cover 61 can be opened and closed. When the front cover 61 is opened, an operator can attach and detach various device parts detachably provided in the printing section 60. For example, the operator can detach and mount the toner cartridge 62 by opening the front cover 61.
The toner cartridge 62 supplies toner to the image forming portion 70. Along the X direction, a plurality of toner cartridges 62Y, 62M, 62C, 62K are arranged. The plurality of toner cartridges 62Y, 62M, 62C, and 62K supply yellow, magenta, cyan, and black toners, respectively.
As shown in fig. 2, the image forming portion 70 has an exposure portion 71 and a photosensitive drum 72. Along the intermediate transfer belt 81, four image forming portions 70Y, 70M, 70C, and 70K are arranged. The four image forming portions 70Y, 70M, 70C, and 70K form toner images with yellow, magenta, cyan, and black toners, respectively.
The exposure section 71 performs an exposure process of scanning and exposing the surface of the photosensitive drum 72 based on the image data received from the image processing section 51. The exposure section 71 has a scanning optical system. The scanning optical system has a light source and a polygon mirror (deflector), and the like. For example, the light source is a laser light source or an LED light source. The polygon mirror reflects light emitted from the light source while rotating. Thereby, the exposure portion 71 performs scanning exposure on the surface of the photosensitive drum 72. At the exposed portion on the surface of the photosensitive drum 72, the negative charge disappears. Thereby, an electrostatic latent image based on the image data is formed on the surface of the photosensitive drum 72.
The photosensitive drum 72 is an image carrier that carries an electrostatic latent image. The photosensitive drum 72 is formed in a cylindrical shape. The charged toner is supplied to the surface of the photoconductive drum 72 to develop the electrostatic latent image. The toner image formed on the surface of the photoconductive drum 72 is primarily transferred to the intermediate transfer belt 81.
The transfer unit 80 sequentially performs primary transfer of the toner images of the respective colors formed on the surfaces of the respective photosensitive drums 72, thereby forming primary transfer images of the toners of the respective colors. Further, the transfer unit 80 secondarily transfers the primary transfer image onto the paper P, thereby forming a toner image on the paper P. As shown in fig. 2, the transfer unit 80 has an intermediate transfer belt 81, a drive roller 82, a driven roller 83, a primary transfer roller 84, and a secondary transfer roller 85.
The intermediate transfer belt 81 is stretched laterally by a drive roller 82 and a plurality of driven rollers 83. The drive roller 82 is rotationally driven by a drive motor not shown. When the driving roller 82 is driven, the intermediate transfer belt 81 is circularly moved. The linear velocity of the intermediate transfer belt 81 coincides with a predetermined process linear velocity. The surface of the intermediate transfer belt 81 partially contacts the top of the upper side of each photosensitive drum 72.
Primary transfer rollers 84 are disposed inside the intermediate transfer belt 81 at positions facing the photosensitive drums 72, respectively. When the primary transfer voltage is applied, the primary transfer roller 84 primarily transfers the toner image on the photoconductive drum 72 to the intermediate transfer belt 81.
The secondary transfer roller 85 faces the drive roller 82 via the intermediate transfer belt 81. When the sheet P passes between the drive roller 82 and the secondary transfer roller 85, a secondary transfer voltage is applied to the secondary transfer roller 85. When the secondary transfer voltage is applied, the secondary transfer roller 85 secondarily transfers the toner image on the intermediate transfer belt 81 to the paper P.
The fixing portion 90 applies heat and pressure to the paper P to fix the toner image transferred to the paper P. The fixing section 90 discharges the sheet P to the sheet discharge section 91. The paper discharge unit 91 places the discharged paper P.
Fig. 4 is a perspective view of the manual tray 100. Fig. 5 is a perspective view of the manual tray 100 viewed from a different angle than fig. 4.
The manual feed tray 100 is a tray that can be attached to the printer unit main body 60a so as to be openable and closable. When the manual feed tray 100 is not used, the manual feed tray 100 is accommodated in a side portion of the printing unit main body 60 a. The manual tray 100 includes a manual tray main body 101, a paper tray 102, a pair of manual guides 103, and an elevating mechanism 104.
The manual tray main body 101 is provided to the printing unit main body 60a so as to be rotatable about a rotation axis extending in the Y direction.
As shown in fig. 3, the sheet tray 102 is a tray for loading sheets P. The paper tray 102 is provided on the upper portion of the manual tray main body 101. The paper tray 102 is attached to the manual tray main body 101 so as to be rotatable about a rotation shaft 102a extending in the Y direction. An end portion 102b of the paper tray 102 on the side of the printing portion main body 60a is rotatable between a position in contact with the manual tray main body 101 and a position in contact with the pickup roller 42. Fig. 6 is a perspective view of the manual tray 100 in which the sheet tray 102 is located at a position in contact with the pickup roller 42.
The paper tray 102 has a spring 102s between it and the manual tray main body 101. The paper tray 102 is urged toward a position where the end 102b of the paper tray 102 contacts the pickup roller 42.
The pair of manual guides 103 are wall-shaped members extending parallel to the X direction and facing each other in the Y direction. The pair of manual guides 103 are disposed so as to sandwich the sheet P on the sheet tray 102 in the Y direction. The pair of manual guides 103 is movable according to the paper size of the paper P.
Fig. 7 is a perspective view of the lifting mechanism 104.
The lifting mechanism 104 can lift the paper tray 102 to a raised position where the pickup roller 42 contacts the paper P and a lowered position lower than the raised position. The lifting mechanism 104 includes an electric motor 105, a worm gear 106, a rotary shaft 107, a drive gear 108, and a cam 109.
A rotation shaft 105a of the electric motor 105 is orthogonal to the rotation shaft 107 and connected to the worm wheel 106. The worm wheel 106 converts the rotation of the electric motor 105 into the rotation of the rotation shaft 107.
The rotation shaft 107 is a rotation shaft extending in the Y direction. A drive gear 108 and a cam 109 are attached to the rotary shaft 107 at both ends in the Y direction. The drive gears 108 are a plurality of gears driven by the rotation of the rotary shaft 107. The drive gear 108 rotationally drives the cam 109 about a rotational axis extending in the Y direction.
The cam 109 is rotationally driven, and thereby the paper tray 102 can be lifted up and down to a rising position where the pickup roller 42 contacts the paper P and a falling position lower than the rising position. The cam 109 is rotationally driven, thereby lowering the sheet tray 102 to the lowered position against the urging force of the spring 102 s.
Next, the operation of the manual feed tray 100 in the image processing apparatus 200 will be described.
The user opens the manual paper tray 100 and loads the paper P on the paper tray 102 of the manual paper tray 100. The user operates the operation unit 20 to set the sheet to be processed as the sheet P to be loaded on the manual feed tray 100.
The controller 10 controls the lifting mechanism 104 to move the paper tray 102 to the lifted position. The sheet P is sandwiched between the sheet tray 102 and the pickup roller 42. Next, the controller 10 drives the pickup roller 42, the paper feed roller 43, and the separation roller 44 to convey the paper P to the conveyance path R (pickup step and conveyance step).
Fig. 8 is a sectional view of the paper feed unit 40 that conveys the paper P.
When the paper P is conveyed by the paper feed roller 43, the first paper sensor 47 detects the paper P conveyed by the paper feed roller 43.
Fig. 9 is a sectional view of the paper feed unit 40 when the first paper sensor 47 detects the paper P.
After the first paper sensor 47 detects the paper P, the controller 10 controls the lifting mechanism 104 to lower the paper tray 102 to a lowered position lower than the raised position (a lowering step). The controller 10 may move the paper tray 102 to a lowered position slightly lower than the raised position without lowering the paper tray to a position contacting the manual tray main body 101. When the sheet tray 102 is located at the lowered position, the sheets P loaded on the sheet tray 102 do not contact the pickup roller 42.
As shown in fig. 9, the paper tray 102 moves to the lowered position, whereby the curvature of the paper P viewed from the Y direction becomes small. As a result, the conveyance load of the sheet P acting on the sheet feeding roller 43 can be reduced, and the sheet P can be stably conveyed. Further, the sound volume of the sound generated when the rear end portion (end portion on the upstream side in the conveying direction) of the sheet P leaves the sheet tray 102 can be reduced.
After the conveyance of the sheet P is finished, the controller 10 moves the sheet tray 102 to the raised position to convey the next sheet P.
According to the image processing apparatus 200, the conveyance load of the sheet P conveyed from the manual feed tray 100 can be reduced by raising and lowering the sheet tray 102. In particular, when thick paper is selected as the paper P, the controller 10 can reduce the conveyance load of the paper P satisfactorily by controlling the paper tray 102 by the lifting mechanism 104. In the present specification, "thick paper" means every 1m2The weight of (1) is 81-256 g.
When thick paper is selected as the paper P, the controller 10 may set the conveyance speed of the paper P by the paper feed roller 43 to be lower than the conveyance speed when paper other than thick paper is selected as the paper P. The sound volume of the sound generated when the rear end portion of the sheet P leaves the sheet tray 102 can be further reduced.
(second embodiment)
A second embodiment will be described with reference to fig. 10 and 11. In the following description, the same components as those described above are denoted by the same reference numerals, and redundant description thereof is omitted. The image processing apparatus 200B according to the second embodiment has the same configuration as the image processing apparatus 200 according to the first embodiment, and differs only in the method of controlling the elevating mechanism 104 by the controller 10.
The user opens the manual paper tray 100 and loads the paper P on the paper tray 102 of the manual paper tray 100. The user operates the operation unit 20 to set the sheet to be processed as the sheet P to be loaded on the manual feed tray 100.
The controller 10 controls the lifting mechanism 104 to move the paper tray 102 to the lifted position. The sheet P is sandwiched between the sheet tray 102 and the pickup roller 42. Next, the controller 10 drives the pickup roller 42, the paper feed roller 43, and the separation roller 44 to convey the paper P to the conveyance path R.
Fig. 10 is a sectional view of the paper feed unit 40 that conveys the paper P.
When the conveying rollers 45 convey the sheet P, the second sheet sensor 48 detects the sheet P conveyed by the conveying rollers 45.
Fig. 11 is a sectional view of the paper feed unit 40 when the second paper sensor 48 detects the paper P. The length of the conveying path from the pickup roller 42 to the conveying roller 45 is shorter than the maximum sheet length of the sheet P. Therefore, when the second paper sensor 48 detects the paper P, the rear end portion of the paper P contacts the paper tray 102.
After the second paper sensor 48 detects the paper P, the controller 10 controls the lifting mechanism 104 to lower the paper tray 102 to a lowered position lower than the raised position. When the sheet tray 102 is located at the lowered position, the sheets P loaded on the sheet tray 102 do not contact the pickup roller 42.
As shown in fig. 11, the paper tray 102 moves to the lowered position, whereby the curvature of the paper P viewed from the Y direction becomes small. As a result, the conveyance load of the sheet P acting on the sheet feeding roller 43 can be reduced, and the sheet P can be stably conveyed. Further, the sound volume of the sound generated when the rear end portion of the sheet P leaves the sheet tray 102 can be reduced.
Fig. 12 is a cross-sectional view of the paper feeding unit 40 showing the positional relationship between the paper feeding roller 43 and the conveying roller 45. When an angle α formed by a tangent line L1 at the contact point of the paper feed roller 43 and the paper P perpendicular to the rotation axis of the paper feed roller 43 and a tangent line L2 at the contact point of the conveyance roller 45 and the paper P perpendicular to the rotation axis of the conveyance roller 45 is 100 degrees to 160 degrees, the curvature of the paper P as viewed from the Y direction is large. In this case, by performing the lowering step of lowering the paper tray 102 to the lowered position after the second paper sensor 48 detects the paper P, the conveyance load of the paper P can be reduced, and the paper P can be conveyed well and stably. In particular, when the angle α is 130 degrees to 140 degrees, the above-described effect obtained by performing the lowering process is further exhibited.
According to the image processing apparatus 200B, the conveyance load of the sheet P conveyed from the manual feed tray 100 can be reduced by raising and lowering the sheet tray 102. In particular, when thick paper is selected as the paper P, the controller 10 can reduce the conveyance load of the paper P satisfactorily by controlling the paper tray 102 by the lifting mechanism 104.
According to at least one embodiment described above, in the image processing apparatus having the manual feed tray 100, the feeding load of the paper P fed from the manual feed tray 100 can be reduced.
Several embodiments have been described, but these embodiments are only provided as examples and are not intended to limit the scope of the invention. Actually, the new embodiment described herein may be implemented in other various forms, and various omissions, substitutions, and changes in the form of the embodiment described herein may be made without departing from the spirit of the invention. It is intended that all such modifications and variations be included within the scope and spirit of the present invention and within the scope and range of equivalents of the appended claims.

Claims (10)

1. An image processing apparatus includes:
a paper tray for loading paper;
a pickup roller that nips the sheet with the sheet tray to perform pickup;
a paper feed roller that conveys the paper picked up by the pickup roller;
a lifting mechanism capable of lifting the paper tray to a lifting position where the pickup roller contacts the paper and a lowering position lower than the lifting position; and
and a control device that controls the lifting mechanism to move the paper tray to the lowered position when the paper feeding roller conveys the paper.
2. The image processing apparatus according to claim 1, further comprising:
a first paper sensor that detects the paper conveyed by the paper feed roller,
when the first paper sensor detects the paper, the control device controls the lifting mechanism to move the paper tray to the lowered position.
3. The image processing apparatus according to claim 2,
after the conveyance of the paper is completed, the control device moves the paper tray to the raised position.
4. The image processing apparatus according to claim 1, further comprising:
a transport roller that is disposed on a transport path of the sheet at a position downstream of the sheet feed roller in a transport direction and transports the sheet; and
a second paper sensor that detects the paper conveyed by the conveying roller,
when the second paper sensor detects the paper, the control device controls the lifting mechanism to move the paper tray to the lowered position.
5. The image processing apparatus according to claim 4,
the length of a conveying path from the pickup roller to the conveying roller is shorter than a maximum sheet length of the sheet.
6. The image processing apparatus according to claim 1,
when thick paper is selected as the paper, the control device controls the lifting mechanism to move the paper tray to the lowered position when the paper is conveyed by the paper feed roller.
7. The image processing apparatus according to claim 1,
the control device makes the conveying speed of the paper feeding roller to the paper when thick paper is selected as the paper smaller than the conveying speed when paper other than thick paper is selected as the paper.
8. The image processing apparatus according to claim 4,
a sum of tangents at a contact point of the paper feed roller and the paper perpendicular to a rotation axis of the paper feed roller
An angle formed by a tangent line at a contact point of the conveying roller and the sheet, which is perpendicular to a rotation axis of the conveying roller, is 100 to 160 degrees.
9. A sheet feeding method using a sheet tray loaded with sheets, the sheet feeding method comprising:
a pickup step of moving the paper tray to a raised position where the paper can be picked up, and picking up the paper;
a conveying step of conveying the picked paper; and
and a lowering step of moving the paper tray to a lowered position lower than the raised position after the conveying step is started.
10. The paper feeding method according to claim 9,
when thick paper is selected as the paper, the lowering process is performed.
CN202110009345.3A 2020-02-20 2021-01-05 Image processing apparatus and paper feeding method Active CN113281970B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202016796129A 2020-02-20 2020-02-20
US16/796,129 2020-02-20

Publications (2)

Publication Number Publication Date
CN113281970A true CN113281970A (en) 2021-08-20
CN113281970B CN113281970B (en) 2024-04-30

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