US20150266683A1 - Sheet conveying apparatus and image forming apparatus - Google Patents
Sheet conveying apparatus and image forming apparatus Download PDFInfo
- Publication number
- US20150266683A1 US20150266683A1 US14/644,366 US201514644366A US2015266683A1 US 20150266683 A1 US20150266683 A1 US 20150266683A1 US 201514644366 A US201514644366 A US 201514644366A US 2015266683 A1 US2015266683 A1 US 2015266683A1
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- United States
- Prior art keywords
- conveying
- roller
- guide
- driven roller
- sheet
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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
- 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
- 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
- B65H5/062—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers between rollers or balls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H9/00—Registering, e.g. orientating, articles; Devices therefor
- B65H9/002—Registering, e.g. orientating, articles; Devices therefor changing orientation of sheet by only controlling movement of the forwarding means, i.e. without the use of stop or register wall
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2402/00—Constructional details of the handling apparatus
- B65H2402/40—Details of frames, housings or mountings of the whole handling apparatus
- B65H2402/44—Housings
- B65H2402/441—Housings movable for facilitating access to area inside the housing, e.g. pivoting or sliding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2402/00—Constructional details of the handling apparatus
- B65H2402/40—Details of frames, housings or mountings of the whole handling apparatus
- B65H2402/45—Doors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2402/00—Constructional details of the handling apparatus
- B65H2402/50—Machine elements
- B65H2402/54—Springs, e.g. helical or leaf springs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/11—Details of cross-section or profile
- B65H2404/111—Details of cross-section or profile shape
- B65H2404/1113—C-shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/13—Details of longitudinal profile
- B65H2404/134—Axle
- B65H2404/1341—Elastic mounting, i.e. subject to biasing means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/14—Roller pairs
- B65H2404/144—Roller pairs with relative movement of the rollers to / from each other
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/15—Roller assembly, particular roller arrangement
- B65H2404/152—Arrangement of roller on a movable frame
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/15—Roller assembly, particular roller arrangement
- B65H2404/152—Arrangement of roller on a movable frame
- B65H2404/1521—Arrangement of roller on a movable frame rotating, pivoting or oscillating around an axis, e.g. parallel to the roller axis
- B65H2404/15212—Arrangement of roller on a movable frame rotating, pivoting or oscillating around an axis, e.g. parallel to the roller axis rotating, pivoting or oscillating around an axis perpendicular to the roller axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/17—Details of bearings
- B65H2404/174—Details of bearings free bearing but slots or liquid support
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/60—Other elements in face contact with handled material
- B65H2404/61—Longitudinally-extending strips, tubes, plates, or wires
- B65H2404/611—Longitudinally-extending strips, tubes, plates, or wires arranged to form a channel
- B65H2404/6111—Longitudinally-extending strips, tubes, plates, or wires arranged to form a channel and shaped for curvilinear transport path
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2405/00—Parts for holding the handled material
- B65H2405/10—Cassettes, holders, bins, decks, trays, supports or magazines for sheets stacked substantially horizontally
- B65H2405/15—Large capacity supports arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2405/00—Parts for holding the handled material
- B65H2405/30—Other features of supports for sheets
- B65H2405/33—Compartmented support
- B65H2405/332—Superposed compartments
-
- 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
Definitions
- the present invention relates to a sheet conveying apparatus which conveys a sheet, and an image forming apparatus which is provided with the sheet conveying apparatus.
- a driven roller 253 which is on a door side to be opened/closed with respect to a main body of the image forming apparatus
- a configuration in which a pressing spring 256 is hooked around and presses a driven roller shaft 252 is employed in many products for the space saving and for the low cost (Japanese Patent Laid-Open No. 06-144633).
- An object of the invention is to provide a sheet conveying apparatus and an image forming apparatus which is provided with the same, through which a size can be reduced and a spring constant is reduced, and a spring pressure can be stabilized by suppressing a variation in pressure.
- the sheet conveying apparatus includes: a conveying roller configured to be rotated by a driving force; a driven roller configured to be disposed to face the conveying roller and to be rotatably driven by the conveying roller; a conveying guide configured to guide a sheet which is conveyed by the conveying roller and the driven roller; a pressing spring configured to press the driven roller toward the conveying roller; a holding portion configured to be provided to be rotated about a shaft center of the driven roller and to receive a pressing force of the pressing spring; and a supporting portion configured to support the driven roller in a direction perpendicular to a sheet conveying direction so as to abut on or be separated from the conveying roller, wherein the holding portion includes a facing portion which is disposed to face the conveying guide, the facing portion is separated from the conveying guide in a state where the driven roller abuts on the conveying roller, and the facing portion abuts on the conveying guide when the driven
- the apparatus in size and reduce the spring constant, and it is possible to make the spring pressure stable by suppressing the variation in pressure.
- the facing portion of the holding portion can be maintained in substantially parallel to the conveying guide by a frictional force between the holding portion and the pressing spring.
- the spring pressure is stabilized by suppressing the variation in pressure, it is possible to prevent clogging and skew feeding of the sheet.
- FIG. 1 is a diagram illustrating an image forming apparatus which includes a sheet conveying apparatus according to the invention.
- FIG. 2 is a schematic view for describing the sheet conveying apparatus (an opening/closing guide is a closed state) according to the invention.
- FIG. 3 is a schematic view for describing the sheet conveying apparatus (the opening/closing guide is an opened state) according to the invention.
- FIG. 4 is a schematic sectional view for describing a driven roller portion of the sheet conveying apparatus according to the invention.
- FIGS. 5A to 5E are schematic views for describing the states of a driving roller and a driven roller of the sheet conveying apparatus according to the invention.
- FIG. 6 is a schematic view for describing a variation in conveyance pressure of the sheet conveying apparatus according to the invention.
- FIG. 7 is a schematic view for describing another example of the sheet conveying apparatus according to the invention.
- FIG. 8 is a schematic view for describing another example of the sheet conveying apparatus according to the invention.
- FIGS. 9A and 9B are schematic views for describing another example of the sheet conveying apparatus according to the invention.
- FIGS. 10A and 10B are schematic views for describing a sheet conveying apparatus of the related art.
- FIG. 1 is a schematic sectional view of the image forming apparatus which includes the sheet conveying apparatus to which the invention is employed.
- an original is automatically sent up to a reading position by an auto original feeding portion 120 , and image information is read by an image reading portion 130 .
- the read image information is processed by a controller (not illustrated), and a laser beam is emitted from a laser scanner unit 111 according to a signal based on the processing result, and an electrostatic latent image is formed on a photosensitive drum 112 .
- a sheet feeding apparatus is disposed on the lower side and the right side of the image forming apparatus.
- the sheet feeding apparatus includes a storage unit 11 which is drawable out of an apparatus body and an air feed type of sheet feeding mechanism which includes a conveying belt 21 .
- a sheet stored in the storage unit 11 is fed to an image forming portion by the sheet feeding mechanism.
- the electrostatic latent image on the photosensitive drum is developed by a development device 113 , and the developed toner image on the photosensitive drum is transferred in a transfer portion 118 onto the sheet which is synchronized in a registration portion 117 . Furthermore, the sheet is guided to a pair of fixing rollers 114 to be heated and pressured for the fixation, and then discharged.
- FIGS. 2 and 3 illustrate perspective views of the vertical path conveying unit
- FIG. 4 illustrates a cross-sectional view of a driven roller portion
- FIGS. 5A to 5E illustrate schematic views of a pair of rollers.
- an inner side and a front side indicate one side in a width direction perpendicular to a conveyance direction of the sheet and the other side, respectively.
- the vertical path conveying unit 200 includes a fixed guide unit 210 and an opening/closing guide unit 220 , and is configured such that the opening/closing guide unit 220 is freely opened or closed with respect to the fixed guide unit 210 by an opening/closing hinge 227 .
- a fixed guide 211 serving as a conveying guide which guides the sheet, positioning pins 212 and 213 on the front side and the inner side, and a magnet 214 are provided.
- an opening/closing guide 221 serving as the conveying guide which guides the sheet, a hold 222 , bearings 223 and 224 for the positioning on the front side and the inner side, a magnet attracting portion 225 , a guide abutment portion 226 , and a driven roller portion 230 are provided.
- one roller (herein, a driving roller 215 ) is provided in the fixed guide unit, and the other roller (herein, a driven roller 233 of the driven roller portion 230 ) facing the one roller is provided in the opening/closing guide unit.
- the opening/closing guide unit is opened and closed with respect to the fixed guide unit, so that the driven roller 233 and the driving roller 215 are configured to abut or be separated.
- the position of the opening/closing guide 221 in the vertical direction is determined with respect to the fixed guide unit 210 by the positioning pins 212 and 213 on the front side and the inner side and the bearings 223 and 224 for the positioning on the front side and the inner side.
- the opening/closing guide 221 is fixed with respect to the fixed guide unit 210 by the magnet 214 and the magnet attracting portion 225 .
- the position of the magnet 214 is adjusted to make the guide abutment portion 226 abut on the fixed guide 211 .
- the driving roller 215 serving as the conveying roller having two rubber portions 215 a and 215 b on a metal shaft 215 c is provided in the fixed guide unit 210 , and the driving roller 215 is supported to the fixed guide unit 210 to be rotated.
- the driving roller 215 is rotated by a driving force from a driving motor (a driving source) which is not illustrated.
- the driven roller 233 is supported to a driven roller shaft 232 through a bearing 234 to be rotated.
- the driven roller shaft 232 is supported by the bearing 231 fitted in a U-shaped groove or a long hole formed in the frame to be movable in a direction perpendicular to the sheet conveying direction, so that the driven roller 233 abuts on or is separated from the driving roller 215 .
- a spring holder (holding portion) 235 which receives a pressing force of a pressing spring 236 serving as a pressing portion is supported to be rotated.
- the pressing spring 236 in the example is a coil spring, both ends thereof are fixed to spring hook portions 237 , and a coil portion is fixed to the spring holder 235 to be partially wound. Therefore, the driven roller 233 is pressed toward the driving roller (the pressing direction) by the pressing spring 236 through the spring holder 235 .
- the driven roller 233 is disposed to face the driving roller 215 , and is rotatably driven by the driving roller 215 in a state where the driven roller 233 is pressed by the pressing spring 236 and comes into press contact with the driving roller 215 .
- the bearing 231 supports the driven roller 233 to be movable in a direction abutting on or separated from the driving roller 215 and restricts the movement of the driven roller 233 in the sheet conveying direction.
- the bearing 231 and U-shaped groove (or the long hole) set forth above serve as a supporting portion.
- the description has been made about the spring holder 235 is configured to be supported to the driven roller shaft 232 to be rotated, but the spring holder 235 may be configured to be supported to the driven roller 233 to be rotated. In other words, the spring holder 235 may be provided to be rotated about a shaft center X of the driven roller 233 .
- FIG. 6 illustrates a change of the pressing force with respect to a positional change of the driven roller in a case where the pressing spring 236 of the example is used instead of the pressing spring 256 of the related art.
- FIGS. 10A and 10B illustrate the positions of the driving roller and the driven roller of the related art with respect to the guide.
- FIG. 5A illustrates the virtual positions of the driving roller and the driven roller with respect to the guide.
- the spring holder 235 is rotatably provided in the driven roller shaft 232 in the example, so that the spring holder 235 receives the pressing force of the pressing spring 236 and presses the driven roller 233 toward the driving roller. Therefore, in a case where a nip pressure with respect to the driving roller is raised, compared to the conventional configuration, the spring length can be increased by the above-mentioned spring holder 235 , so that a spring constant can be reduced. Furthermore, a partial force is generated in a direction forming an angle ⁇ (smaller than the conventional angle ⁇ 0 ) with respect to a direction of a pressing force F 0 .
- the partial force is a partial force f 0 smaller than the conventional partial force f 0 , it is possible to suppress a variation in nip pressure with respect to the driving roller.
- the spring holder 235 has no influence on the bearing 231 , a variation in frictional resistance does not occur in the pressing direction and the pressing force becomes stable.
- FIG. 5B illustrates a case where the driving roller 215 is shifted toward the driven roller portion 230 , the pressing spring 236 is extended, and the pressing force is increased.
- FIG. 5C illustrates a case where the driving roller 215 is shifted to a side away from the driven roller portion 230 by bending of a driving roller shaft 215 c , the pressing spring 236 is compressed, and the pressing force is reduced.
- a shift amount ⁇ f 2 of the pressing force of the pressing spring 236 of the example is significantly reduced compared to a shift amount ⁇ F 2 of the pressing force of the conventional pressing spring 256 .
- the spring holder 235 includes a flat-shaped facing portion 235 a which faces the opening/closing guide 221 , a flank 235 b of the spring hook portion, and an arc-shaped spring receiving portion 235 c which receives the pressing force of the pressing spring 236 .
- the facing portion 235 a is provided to face the opening/closing guide 221 on a side opposite to the spring receiving portion 235 c (an arc-shaped portion) through a rotation center (the shaft 232 ).
- the facing portion 235 a is formed in a flat surface along a rear surface (a surface on the rear side of the guide surface for guiding the sheet) of the opening/closing guide 221 , and is substantially parallel to the rear surface of the opening/closing guide 221 .
- a first dimension 235 d is set from the rotation center of the spring holder 235 to the flank 235 b in the sheet conveying direction and a second dimension 235 e is set from the rotation center to a vertex of the peripheral surface of the spring receiving portion 235 c in a direction (the pressing direction) perpendicular to the sheet conveying direction
- the spring holder 235 has a dimensional relation of “ 235 e > 235 d ”.
- FIG. 5D illustrates a state where the spring holder 235 is rotated in a direction of arrow A due to a sheet clogging (sheet jamming).
- the driven roller 233 is separated from the driving roller.
- the spring holder 235 is pushed toward the driving roller by the pressing spring 236 , and the facing portion 235 a is rotated in a direction of arrow A′ to be aligned with the opening/closing guide 221 .
- the facing portion 235 a enters a pressed state while being substantially parallel to the opening/closing guide 221 by a frictional force between the spring holder 235 and the pressing spring 236 as illustrated in FIG. 5A .
- the size can be reduced and the spring constant of the pressing spring 236 can also be reduced, and it is possible to make a spring pressure stable by suppressing a variation in pressure.
- a less variation in pressure clogging and skew feeding of the sheet can be prevented, and the operability of the opening/closing guide can also be improved.
- the facing portion 235 a of the spring holder 235 abuts on the opening/closing guide 221 , the facing portion 235 a of the spring holder 235 can be substantially parallel to the opening/closing guide 221 by the frictional force between the spring holder 235 and the pressing spring 236 .
- the flat portion facing the opening/closing guide 221 of the spring holder 235 is formed as the facing portion, but the invention is not limited thereto.
- the facing portion two protruding portions 235 f may be provided to abut on the opening/closing guide 221 as illustrated in FIG. 7 .
- the number of protruding portions 235 f is not limited to “2”, and at least two portions may be provided.
- the tip of each protruding portion is formed to abut on the opening/closing guide 221 . In other words, in a case where the opening/closing guide 221 enters the state of FIG.
- the protruding portion 235 f may be configured to abut on the opening/closing guide 221 to return to the state of FIG. 5E . Further, it is possible to make the spring constant small still more by significantly changing a dimensional relation “ 235 e > 235 d ” between the first dimension 235 d from the rotation center of the spring holder (holding portion) 235 to the peripheral surface in the sheet conveying direction and the second dimension 235 e from the rotation center to the peripheral surface in the pressing direction.
- the invention may be applied to a conveying unit (the sheet conveying apparatus) which is configured to fasten a detachable guide unit 260 by a fixing screw 262 to be detachably attachable to the fixed guide unit.
- the detachable guide unit 260 includes the driven roller portion 230 which has the same configuration as that of the example described above.
- the facing portion 235 a of the driven roller portion 230 is assembled to a detachable guide 261 to face each other.
- the facing portion 235 a facing the spring holder (holding portion) 235 comes into close contact with the detachable guide 261 to be aligned (that is, the state of FIG. 5E ).
- the facing portion 235 a enters a pressed state while being substantially parallel to the detachable guide 261 by the frictional force between the spring holder 235 and the pressing spring 236 . Therefore, the same effect as the example described above is achieved even in this example.
- a driving roller 300 includes a driving roller shaft 301 , a roller conveying surface 302 which is the peripheral surface facing the driven roller, and a notch portion 303 which is formed in a part of the roller conveying surface 302 .
- FIG. 9A when the driven roller portion 230 comes to face the notch portion 303 of the driving roller 300 , the driven roller portion 230 is pressed toward the driving roller 300 .
- the facing portion 235 a of the spring holder (holding portion) 235 comes into close contact with the opening/closing guide 221 to be aligned.
- the driving roller 300 is rotated in a direction of arrow C
- the driven roller portion 230 is pushed up to a side opposite to the pressing direction by the roller conveying surface 302
- the facing portion 235 a enters a pressed state while being substantially parallel to the opening/closing guide 221 by the frictional force between the spring holder 235 and the pressing spring 236 . Therefore, the same effect as that of the example described above is achieved even in this example.
- another image forming apparatus such as a scanner, a printer, and a facsimile machine, or other image forming apparatuses such as a multifunction peripheral obtained by combining these functions may be employed.
- the invention is effectively applied to another sheet conveying apparatus which is included in the image forming apparatus.
- the same effect can be achieved by applying the invention to a sheet conveying apparatus which conveys a sheet such as an original as a reading target.
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- Delivering By Means Of Belts And Rollers (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
Abstract
Description
- 1. Field of the Invention
- The present invention relates to a sheet conveying apparatus which conveys a sheet, and an image forming apparatus which is provided with the sheet conveying apparatus.
- 2. Description of the Related Art
- In recent years, when an image forming apparatus such as a printer or a copying machine performs a printing operation, a wide variety of sheets are used depending on purposes. In particular, there has been increasing demand for a thick sheet used in packages made of a boxing material as a wide variety of sheets, but the sheet has a problem in that rigidity is large and sheet clogging easily occurs. Therefore, as a countermeasure, a radius R of a bending portion in a conveying path is made large, resistance exerted from a conveying guide when the sheet is conveyed is reduced, and a nip pressure of a conveying roller is significantly increased to raise a conveying force.
- Furthermore, in order to comply with the demand for the wide variety of sheets, space saving of installation area for the apparatus or cost saving is also increasingly demanded. However, when the radius R of the bending portion in the conveying path is made large, the apparatus is increased in size to cause the cost to be significantly increased, so that it conflicts with reality. For this reason, the countermeasures of raising the nip pressure of the conveying roller and increasing the conveying force are widely employed.
- In addition, as illustrated in
FIGS. 10A and 10B , likewise a drivenroller 253 which is on a door side to be opened/closed with respect to a main body of the image forming apparatus, a configuration in which apressing spring 256 is hooked around and presses a drivenroller shaft 252 is employed in many products for the space saving and for the low cost (Japanese Patent Laid-Open No. 06-144633). - However, in the configuration illustrated in
FIG. 10B , in a case where the nip pressure of the conveying roller is raised, the length of thepressing spring 256 is not possible to be long, so that a spring constant is increased. In this case, since a partial force f0 is generated in a direction of angle θ0 with respect to in a direction of a pressing force F0, a variation in pressure is easily increased still more. Then, since the pressing force is increased, aroller shaft 215 c of adriving roller 215 or an opening/closing guide 221 is significantly bent, an actual length of thepressing spring 256 is reduced at the time of pressing, the spring constant is increased, and a necessary pressing force is also not obtained. - As illustrated in
FIG. 10A , in the opening/closing guide 221 where an opening/closing hinge 227 is provided on a side (herein, an inner side) of a width direction perpendicular to the conveying direction of the sheet, bending on the side (the inner side) of the width direction is different from that on the other side (the front side). For this reason, a difference of the pressing force on the inner side and the front side of the width direction is increased, so that the sheet is fed on the skew. - An object of the invention is to provide a sheet conveying apparatus and an image forming apparatus which is provided with the same, through which a size can be reduced and a spring constant is reduced, and a spring pressure can be stabilized by suppressing a variation in pressure.
- In order to achieve the above object, there is provided a sheet conveying apparatus of the invention. The sheet conveying apparatus includes: a conveying roller configured to be rotated by a driving force; a driven roller configured to be disposed to face the conveying roller and to be rotatably driven by the conveying roller; a conveying guide configured to guide a sheet which is conveyed by the conveying roller and the driven roller; a pressing spring configured to press the driven roller toward the conveying roller; a holding portion configured to be provided to be rotated about a shaft center of the driven roller and to receive a pressing force of the pressing spring; and a supporting portion configured to support the driven roller in a direction perpendicular to a sheet conveying direction so as to abut on or be separated from the conveying roller, wherein the holding portion includes a facing portion which is disposed to face the conveying guide, the facing portion is separated from the conveying guide in a state where the driven roller abuts on the conveying roller, and the facing portion abuts on the conveying guide when the driven roller is separated from the conveying roller.
- According to the invention, it is possible to reduce the apparatus in size and reduce the spring constant, and it is possible to make the spring pressure stable by suppressing the variation in pressure. Furthermore, the facing portion of the holding portion can be maintained in substantially parallel to the conveying guide by a frictional force between the holding portion and the pressing spring. In addition, since the spring pressure is stabilized by suppressing the variation in pressure, it is possible to prevent clogging and skew feeding of the sheet.
- Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings.
-
FIG. 1 is a diagram illustrating an image forming apparatus which includes a sheet conveying apparatus according to the invention. -
FIG. 2 is a schematic view for describing the sheet conveying apparatus (an opening/closing guide is a closed state) according to the invention. -
FIG. 3 is a schematic view for describing the sheet conveying apparatus (the opening/closing guide is an opened state) according to the invention. -
FIG. 4 is a schematic sectional view for describing a driven roller portion of the sheet conveying apparatus according to the invention. -
FIGS. 5A to 5E are schematic views for describing the states of a driving roller and a driven roller of the sheet conveying apparatus according to the invention. -
FIG. 6 is a schematic view for describing a variation in conveyance pressure of the sheet conveying apparatus according to the invention. -
FIG. 7 is a schematic view for describing another example of the sheet conveying apparatus according to the invention. -
FIG. 8 is a schematic view for describing another example of the sheet conveying apparatus according to the invention. -
FIGS. 9A and 9B are schematic views for describing another example of the sheet conveying apparatus according to the invention. -
FIGS. 10A and 10B are schematic views for describing a sheet conveying apparatus of the related art. - Hereinafter, exemplary embodiments of the invention will be described in detail with reference to the drawings. However, dimensions, materials, and shapes of the components, and relative arrangements therebetween described in the following embodiments may be appropriately changed according to the configuration and various conditions of the apparatus to which the invention is applied. Therefore, if not otherwise specified, it is not intended to limit the scope of the invention only to these configurations.
- An image forming apparatus which includes a sheet conveying apparatus according to the example will be described using
FIG. 1 .FIG. 1 is a schematic sectional view of the image forming apparatus which includes the sheet conveying apparatus to which the invention is employed. - First, an original is automatically sent up to a reading position by an auto
original feeding portion 120, and image information is read by animage reading portion 130. The read image information is processed by a controller (not illustrated), and a laser beam is emitted from alaser scanner unit 111 according to a signal based on the processing result, and an electrostatic latent image is formed on aphotosensitive drum 112. - A sheet feeding apparatus is disposed on the lower side and the right side of the image forming apparatus. The sheet feeding apparatus includes a
storage unit 11 which is drawable out of an apparatus body and an air feed type of sheet feeding mechanism which includes aconveying belt 21. A sheet stored in thestorage unit 11 is fed to an image forming portion by the sheet feeding mechanism. - In the image forming portion, the electrostatic latent image on the photosensitive drum is developed by a
development device 113, and the developed toner image on the photosensitive drum is transferred in atransfer portion 118 onto the sheet which is synchronized in aregistration portion 117. Furthermore, the sheet is guided to a pair offixing rollers 114 to be heated and pressured for the fixation, and then discharged. - Next, a vertical
path conveying unit 200 serving as the sheet conveying apparatus included in the image forming apparatus will be described. A detailed view of the verticalpath conveying unit 200 is illustrated inFIG. 2 toFIGS. 5A to 5E .FIGS. 2 and 3 illustrate perspective views of the vertical path conveying unit,FIG. 4 illustrates a cross-sectional view of a driven roller portion, andFIGS. 5A to 5E illustrate schematic views of a pair of rollers. Further, in the following description, an inner side and a front side indicate one side in a width direction perpendicular to a conveyance direction of the sheet and the other side, respectively. - As illustrated in
FIGS. 2 and 3 , the verticalpath conveying unit 200 includes afixed guide unit 210 and an opening/closing guide unit 220, and is configured such that the opening/closing guide unit 220 is freely opened or closed with respect to thefixed guide unit 210 by an opening/closing hinge 227. In thefixed guide unit 210, afixed guide 211 serving as a conveying guide which guides the sheet, positioningpins magnet 214 are provided. In the opening/closing guide unit 220, an opening/closing guide 221 serving as the conveying guide which guides the sheet, ahold 222,bearings magnet attracting portion 225, aguide abutment portion 226, and a drivenroller portion 230 are provided. - As described above, in the example, one roller (herein, a driving roller 215) is provided in the fixed guide unit, and the other roller (herein, a driven
roller 233 of the driven roller portion 230) facing the one roller is provided in the opening/closing guide unit. With this configuration, the opening/closing guide unit is opened and closed with respect to the fixed guide unit, so that the drivenroller 233 and the drivingroller 215 are configured to abut or be separated. - As illustrated in
FIG. 2 , when the opening/closing guide unit 220 is closed, the position of the opening/closing guide 221 in the vertical direction (a sheet conveying direction) is determined with respect to the fixedguide unit 210 by the positioning pins 212 and 213 on the front side and the inner side and thebearings closing guide 221 is fixed with respect to the fixedguide unit 210 by themagnet 214 and themagnet attracting portion 225. At this time, the position of themagnet 214 is adjusted to make theguide abutment portion 226 abut on the fixedguide 211. - In addition, the driving
roller 215 serving as the conveying roller having tworubber portions metal shaft 215 c is provided in the fixedguide unit 210, and the drivingroller 215 is supported to the fixedguide unit 210 to be rotated. The drivingroller 215 is rotated by a driving force from a driving motor (a driving source) which is not illustrated. - As illustrated in
FIG. 4 , in the drivenroller portion 230 of the opening/closing guide unit 220, the drivenroller 233 is supported to a drivenroller shaft 232 through abearing 234 to be rotated. The drivenroller shaft 232 is supported by the bearing 231 fitted in a U-shaped groove or a long hole formed in the frame to be movable in a direction perpendicular to the sheet conveying direction, so that the drivenroller 233 abuts on or is separated from the drivingroller 215. In the drivenroller shaft 232 of the drivenroller 233, a spring holder (holding portion) 235 which receives a pressing force of apressing spring 236 serving as a pressing portion is supported to be rotated. Thepressing spring 236 in the example is a coil spring, both ends thereof are fixed tospring hook portions 237, and a coil portion is fixed to thespring holder 235 to be partially wound. Therefore, the drivenroller 233 is pressed toward the driving roller (the pressing direction) by thepressing spring 236 through thespring holder 235. The drivenroller 233 is disposed to face the drivingroller 215, and is rotatably driven by the drivingroller 215 in a state where the drivenroller 233 is pressed by thepressing spring 236 and comes into press contact with the drivingroller 215. Thebearing 231 supports the drivenroller 233 to be movable in a direction abutting on or separated from the drivingroller 215 and restricts the movement of the drivenroller 233 in the sheet conveying direction. Thebearing 231 and U-shaped groove (or the long hole) set forth above serve as a supporting portion. Further, in the example, the description has been made about thespring holder 235 is configured to be supported to the drivenroller shaft 232 to be rotated, but thespring holder 235 may be configured to be supported to the drivenroller 233 to be rotated. In other words, thespring holder 235 may be provided to be rotated about a shaft center X of the drivenroller 233. -
FIG. 6 illustrates a change of the pressing force with respect to a positional change of the driven roller in a case where thepressing spring 236 of the example is used instead of thepressing spring 256 of the related art.FIGS. 10A and 10B illustrate the positions of the driving roller and the driven roller of the related art with respect to the guide.FIG. 5A illustrates the virtual positions of the driving roller and the driven roller with respect to the guide. - Compared to the conventional configuration of pressing a driven
roller shaft 252 with thepressing spring 256, thespring holder 235 is rotatably provided in the drivenroller shaft 232 in the example, so that thespring holder 235 receives the pressing force of thepressing spring 236 and presses the drivenroller 233 toward the driving roller. Therefore, in a case where a nip pressure with respect to the driving roller is raised, compared to the conventional configuration, the spring length can be increased by the above-mentionedspring holder 235, so that a spring constant can be reduced. Furthermore, a partial force is generated in a direction forming an angle θ (smaller than the conventional angle θ0) with respect to a direction of a pressing force F0. Since the partial force is a partial force f0 smaller than the conventional partial force f0, it is possible to suppress a variation in nip pressure with respect to the driving roller. In addition, since thespring holder 235 has no influence on thebearing 231, a variation in frictional resistance does not occur in the pressing direction and the pressing force becomes stable. -
FIG. 5B illustrates a case where the drivingroller 215 is shifted toward the drivenroller portion 230, thepressing spring 236 is extended, and the pressing force is increased. When setting a shift amount at this time to ΔD1 inFIG. 6 , it can be seen that a shift amount Δf1 of the pressing force of thepressing spring 236 of the example is significantly reduced compared to a shift amount ΔF1 of the pressing force of the conventionalpressing spring 256. - Contrarily,
FIG. 5C illustrates a case where the drivingroller 215 is shifted to a side away from the drivenroller portion 230 by bending of a drivingroller shaft 215 c, thepressing spring 236 is compressed, and the pressing force is reduced. When setting a shift amount at this time to ΔD2 inFIG. 6 , it can be seen that a shift amount Δf2 of the pressing force of thepressing spring 236 of the example is significantly reduced compared to a shift amount ΔF2 of the pressing force of the conventionalpressing spring 256. - Further, as illustrated in
FIG. 5A , thespring holder 235 includes a flat-shaped facingportion 235 a which faces the opening/closing guide 221, aflank 235 b of the spring hook portion, and an arc-shapedspring receiving portion 235 c which receives the pressing force of thepressing spring 236. In thespring holder 235, the facingportion 235 a is provided to face the opening/closing guide 221 on a side opposite to thespring receiving portion 235 c (an arc-shaped portion) through a rotation center (the shaft 232). Herein, the facingportion 235 a is formed in a flat surface along a rear surface (a surface on the rear side of the guide surface for guiding the sheet) of the opening/closing guide 221, and is substantially parallel to the rear surface of the opening/closing guide 221. When afirst dimension 235 d is set from the rotation center of thespring holder 235 to theflank 235 b in the sheet conveying direction and asecond dimension 235 e is set from the rotation center to a vertex of the peripheral surface of thespring receiving portion 235 c in a direction (the pressing direction) perpendicular to the sheet conveying direction, thespring holder 235 has a dimensional relation of “235 e>235 d”. -
FIG. 5D illustrates a state where thespring holder 235 is rotated in a direction of arrow A due to a sheet clogging (sheet jamming). From this state, when the opening/closing guide 221 is opened in a direction of arrow B as illustrated inFIG. 5E , the drivenroller 233 is separated from the driving roller. At this time, thespring holder 235 is pushed toward the driving roller by thepressing spring 236, and the facingportion 235 a is rotated in a direction of arrow A′ to be aligned with the opening/closing guide 221. Then, when the opening/closing guide 221 is closed again from the state illustrated in FIG. 5E, the facingportion 235 a enters a pressed state while being substantially parallel to the opening/closing guide 221 by a frictional force between thespring holder 235 and thepressing spring 236 as illustrated inFIG. 5A . - As described above, since the
spring holder 235 is provided in the drivenroller 233 to receive the pressing force of thepressing spring 236, the size can be reduced and the spring constant of thepressing spring 236 can also be reduced, and it is possible to make a spring pressure stable by suppressing a variation in pressure. In addition, with such a configuration of a less variation in pressure, clogging and skew feeding of the sheet can be prevented, and the operability of the opening/closing guide can also be improved. Furthermore, when the facingportion 235 a of thespring holder 235 abuts on the opening/closing guide 221, the facingportion 235 a of thespring holder 235 can be substantially parallel to the opening/closing guide 221 by the frictional force between thespring holder 235 and thepressing spring 236. - In the example described above, the flat portion facing the opening/
closing guide 221 of thespring holder 235 is formed as the facing portion, but the invention is not limited thereto. For example, as the facing portion, two protrudingportions 235 f may be provided to abut on the opening/closing guide 221 as illustrated inFIG. 7 . The number of protrudingportions 235 f is not limited to “2”, and at least two portions may be provided. In a case where three or more protruding portions are provided, the tip of each protruding portion is formed to abut on the opening/closing guide 221. In other words, in a case where the opening/closing guide 221 enters the state ofFIG. 5D when being opened, the protrudingportion 235 f may be configured to abut on the opening/closing guide 221 to return to the state ofFIG. 5E . Further, it is possible to make the spring constant small still more by significantly changing a dimensional relation “235 e>235 d” between thefirst dimension 235 d from the rotation center of the spring holder (holding portion) 235 to the peripheral surface in the sheet conveying direction and thesecond dimension 235 e from the rotation center to the peripheral surface in the pressing direction. Furthermore, since a partial force is generated in a direction of angle θ′ smaller than the conventional angle θ0 compared to the direction of the pressing force F0 and becomes a partial force f0′ smaller than the conventional partial force f0, it is possible to significantly suppress the variation in pressure. - In addition, in the example described above, the description has been made about the opening/
closing guide unit 220, but the invention is not limited thereto. For example, as illustrated inFIG. 8 , the invention may be applied to a conveying unit (the sheet conveying apparatus) which is configured to fasten adetachable guide unit 260 by a fixingscrew 262 to be detachably attachable to the fixed guide unit. Thedetachable guide unit 260 includes the drivenroller portion 230 which has the same configuration as that of the example described above. In thedetachable guide unit 260, the facingportion 235 a of the drivenroller portion 230 is assembled to adetachable guide 261 to face each other. In this case, before a service man assembles thedetachable guide unit 260, the facingportion 235 a facing the spring holder (holding portion) 235 comes into close contact with thedetachable guide 261 to be aligned (that is, the state ofFIG. 5E ). When thedetachable guide unit 260 is screwed, (that is, the state ofFIG. 5A ) the facingportion 235 a enters a pressed state while being substantially parallel to thedetachable guide 261 by the frictional force between thespring holder 235 and thepressing spring 236. Therefore, the same effect as the example described above is achieved even in this example. - In addition, in the example described above, the description has been made about the configuration in which the opening/closing guide moves, but the invention may be applied to a configuration in which the driving roller moves as illustrated in
FIGS. 9A and 9B . A drivingroller 300 includes a drivingroller shaft 301, aroller conveying surface 302 which is the peripheral surface facing the driven roller, and a notch portion 303 which is formed in a part of theroller conveying surface 302. As illustrated inFIG. 9A , when the drivenroller portion 230 comes to face the notch portion 303 of the drivingroller 300, the drivenroller portion 230 is pressed toward the drivingroller 300. Therefore, the facingportion 235 a of the spring holder (holding portion) 235 comes into close contact with the opening/closing guide 221 to be aligned. On the other hand, as illustrated inFIG. 9B , when the drivingroller 300 is rotated in a direction of arrow C, the drivenroller portion 230 is pushed up to a side opposite to the pressing direction by theroller conveying surface 302, the facingportion 235 a enters a pressed state while being substantially parallel to the opening/closing guide 221 by the frictional force between thespring holder 235 and thepressing spring 236. Therefore, the same effect as that of the example described above is achieved even in this example. - In addition, in the example described above, the description has been made about the copying machine as an image forming apparatus, but the invention is not limited thereto. For example, another image forming apparatus such as a scanner, a printer, and a facsimile machine, or other image forming apparatuses such as a multifunction peripheral obtained by combining these functions may be employed. The same effect can be achieved by applying the invention to the sheet conveying apparatus which is used in these image forming apparatuses.
- In addition, in the example described above, the description has been made about the vertical
path conveying unit 200 as the sheet conveying apparatus included in the image forming apparatus, but the invention is not limited thereto. The invention is effectively applied to another sheet conveying apparatus which is included in the image forming apparatus. - In addition, in the example described above, the description has been made about the sheet conveying apparatus which conveys a sheet such as a recording sheet as a recording target, but the invention is not limited thereto. For example, the same effect can be achieved by applying the invention to a sheet conveying apparatus which conveys a sheet such as an original as a reading target.
- While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.
- This application claims the benefit of Japanese Patent Application No. 2014-056387, filed Mar. 19, 2014, which is hereby incorporated by reference herein in its entirety.
Claims (14)
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JP2014-056387 | 2014-03-19 | ||
JP2014056387A JP6282150B2 (en) | 2014-03-19 | 2014-03-19 | Sheet conveying apparatus and image forming apparatus |
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US20150266683A1 true US20150266683A1 (en) | 2015-09-24 |
US9156639B1 US9156639B1 (en) | 2015-10-13 |
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US14/644,366 Active US9156639B1 (en) | 2014-03-19 | 2015-03-11 | Sheet conveying apparatus and image forming apparatus |
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US (1) | US9156639B1 (en) |
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JP6705225B2 (en) * | 2016-03-14 | 2020-06-03 | ブラザー工業株式会社 | Image forming device |
JP7309375B2 (en) | 2019-01-31 | 2023-07-18 | キヤノン株式会社 | sheet conveying device |
JP2020204681A (en) | 2019-06-14 | 2020-12-24 | キヤノン株式会社 | Rotating member support configuration and fixing device using the same |
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- 2015-03-18 CN CN201510129020.3A patent/CN104925552B/en active Active
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JP2015178402A (en) | 2015-10-08 |
US9156639B1 (en) | 2015-10-13 |
CN104925552B (en) | 2017-04-12 |
JP6282150B2 (en) | 2018-02-21 |
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