WO2013080291A9 - 斜行補正装置及び画像形成装置 - Google Patents
斜行補正装置及び画像形成装置 Download PDFInfo
- Publication number
- WO2013080291A9 WO2013080291A9 PCT/JP2011/077457 JP2011077457W WO2013080291A9 WO 2013080291 A9 WO2013080291 A9 WO 2013080291A9 JP 2011077457 W JP2011077457 W JP 2011077457W WO 2013080291 A9 WO2013080291 A9 WO 2013080291A9
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- WIPO (PCT)
- Prior art keywords
- sheet
- roller pair
- roller
- skew
- correction device
- Prior art date
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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
- B65H9/00—Registering, e.g. orientating, articles; Devices therefor
- B65H9/004—Deskewing sheet by abutting against a stop, i.e. producing a buckling of the sheet
- B65H9/006—Deskewing sheet by abutting against a stop, i.e. producing a buckling of the sheet the stop being formed by forwarding means in stand-by
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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
- B65H5/062—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
- B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
- B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
-
- 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
- B65H2220/00—Function indicators
- B65H2220/01—Function indicators indicating an entity as a function of which control, adjustment or change is performed, i.e. input
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2220/00—Function indicators
- B65H2220/02—Function indicators indicating an entity which is controlled, adjusted or changed by a control process, i.e. output
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2220/00—Function indicators
- B65H2220/03—Function indicators indicating an entity which is measured, estimated, evaluated, calculated or determined but which does not constitute an entity which is adjusted or changed by the control process per se
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2220/00—Function indicators
- B65H2220/11—Function indicators indicating that the input or output entities exclusively relate to machine 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
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/14—Roller pairs
- B65H2404/142—Roller pairs arranged on movable frame
- B65H2404/1421—Roller pairs arranged on movable frame rotating, pivoting or oscillating around an axis, e.g. parallel 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
- B65H2404/60—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
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/10—Size; Dimensions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/20—Location in space
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
- B65H2515/10—Mass, e.g. mass flow rate; Weight; Inertia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
- B65H2515/30—Forces; Stresses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
- B65H2557/20—Calculating means; Controlling methods
- B65H2557/23—Recording or storing data
Definitions
- the present invention relates to a skew correction device that corrects skew of a sheet, and an image forming apparatus including the skew correction device.
- a skew correction device is provided to correct the skew of a sheet conveyed to an image forming unit in order to form an image without being inclined with respect to the sheet. ing.
- a registration roller and a shutter are provided upstream of the image forming unit in a conveyance path between a sheet feeding unit for feeding a sheet and the image forming unit.
- the sheet fed from the sheet feeding unit is nipped and conveyed by a registration roller and a roller pair (hereinafter referred to as an upstream roller pair) provided upstream of the shutter.
- the front end of the sheet is abutted against a contact portion such as a registration roller or a shutter to correct skew of the front end of the sheet (see Patent Document 1).
- the sheet is nipped and conveyed by the upstream roller pair, and the leading end of the sheet is brought into contact with the nip portion of the registration roller pair to form a loop on the sheet, thereby causing the leading end of the sheet along the nip portion To correct the skew of the sheet.
- the skew of the sheet can not be corrected, so that the image can not be formed at the regular position on the sheet and an image defect occurs. That is, in the conventional skew correction device, for example, sufficient skew correction performance could not be obtained for both thick paper and thin paper.
- An object of the present invention is to provide a skew correction device capable of obtaining sufficient skew correction performance for various types of sheets.
- a first roller pair for holding a sheet and conveying the sheet;
- a second roller pair provided upstream of the first roller pair for nipping the sheet and transporting the sheet;
- An abutting portion provided downstream of the first roller pair and in contact with a leading end of a sheet conveyed to correct a skew of the sheet;
- a switching mechanism that switches the clamping force of the first roller pair;
- a control unit that controls the switching mechanism to switch the holding force of the first roller pair based on sheet information;
- a skew correction device comprising:
- the switching mechanism switches the clamping force of the first roller pair. Then, the control unit controls the switching mechanism in order to switch the holding force of the switching mechanism based on the sheet information. Therefore, the skew correction performance of various types of sheets can be improved.
- FIG. 6 is a diagram showing a sheet skew correction operation according to the first embodiment of the present invention.
- FIG. 6 is a diagram showing a sheet skew correction operation according to the first embodiment of the present invention.
- FIG. 6 is a diagram showing a sheet skew correction operation according to the first embodiment of the present invention.
- FIG. 6 is a diagram showing a sheet skew correction operation according to the first embodiment of the present invention.
- FIG. 6 is a diagram showing a sheet skew correction operation according to the first embodiment of the present invention.
- FIG. 6 is a diagram showing a sheet skew correction operation according to the first embodiment of the present invention.
- FIG. 6 is a diagram showing a sheet skew correction operation according to the first embodiment of the present invention.
- FIG. 6 is a diagram showing a sheet skew correction operation according to the first embodiment of the present invention.
- FIG. 6 is a diagram showing a sheet skew correction operation according to the first embodiment of the present invention.
- FIG. 6 is a diagram showing a sheet skew correction operation according to the first embodiment of the present invention.
- FIG. 6 is a diagram showing a sheet skew correction operation according to the first embodiment of the present invention.
- FIG. 6 is a diagram showing a sheet skew correction operation according to the first embodiment of the present invention.
- FIG. 6 is a diagram showing a sheet skew correction operation according to the first embodiment of the present invention.
- FIG. 6 is a diagram showing a sheet skew correction operation according to the first embodiment of the present invention.
- a diagram showing a fourth embodiment of a skew feeding correction device to which the present invention is applied The figure which shows the state in which the sheet was buckled in the middle of a conveyance path in the conventional skew correction device The figure which shows the image forming apparatus with which the skew correction apparatus of this invention was applied.
- FIG. 15 is a schematic cross-sectional view of a color digital printer as an example of an image forming apparatus to which the skew correction device of the present invention is applied.
- the surface of the four photosensitive drums 101a to 101d is uniformly charged by the charging rollers 102a to 102d.
- Image signals of yellow (Y), magenta (M), cyan (C), and black (K) are input to the laser scanners 103a to 103d, respectively, and the drum surface is irradiated with laser light according to the image signals to charge them.
- Y yellow
- M magenta
- C cyan
- K black
- the latent images formed on the photosensitive drums are developed with yellow, magenta, cyan and black toners by developing units 104a to 104d, respectively.
- the toners developed on the respective photosensitive drums are sequentially transferred to the intermediate transfer belt 106, which is an endless belt-shaped image carrier, by the primary transfer rollers 105a to 105d, and a full-color toner image is transferred onto the intermediate transfer belt 106. It is formed.
- the sheet fed from the sheet feeding portion of any of the sheet feeding cassettes 111 and 112 or the manual feeding portion 113 is conveyed toward the registration roller pair 120 by the second roller pair 114 and the first roller pair 115. Be done.
- the toner image on the intermediate transfer belt 106 is controlled so that there is no misalignment between the sheet conveyed by the registration roller pair 120 and the image.
- the toner image is transferred to the sheet by the secondary transfer outer roller 109. Thereafter, the toner image is heated and pressed by the fixing device 110 and fixed on the sheet. Thereafter, the sheet is discharged from the discharge portion 119a or 119b to the outside of the apparatus main body.
- the user can input various information (size information, basis weight information, surface property information, etc.) related to the sheet to the control unit described later from the operation unit 200 (shown in FIG. 7) provided in the image forming apparatus. It is set to. Further, various information related to the sheet can be input to a control unit described later from the computer 201 connected via the network.
- the sheet feeding cassettes 111 and 112 are provided with a size detection mechanism 130 for detecting the size of the stored sheet and causing a control unit described later of the image forming apparatus to recognize the size.
- the size detection mechanism 130 has a rotatable size detection lever that is in sliding contact with a side regulating plate that regulates the position of the sheet in the width direction.
- the size detection mechanism 130 includes a plurality of sensors or switches provided at positions corresponding to the size detection levers in the mounting portion of the apparatus main body in which the sheet feeding cassette is mounted. Therefore, when the side regulating plate is moved according to the side edge of the sheet, the size detection lever is interlocked and pivoted.
- the size detection lever selectively turns on / off the detection element of the sensor or switch disposed in the mounting portion of the apparatus main body. Thereby, signals of different patterns are sent from the sensor or switch to the image forming apparatus main body.
- the image forming apparatus main body can recognize the size of the sheet stored in the sheet feeding cassette based on the signal.
- a similar mechanism may be provided in the manual feed unit 113 as a size detection mechanism.
- the side regulation plate is movable according to the side edge of the seat.
- the side regulating plate also has the effect of preventing skewing of the sheet that occurs at the time of sheet feeding and at the conveyance roller downstream of the sheet feeding roller.
- a slight gap between the side regulating plate and the sheet may cause the sheet to be skewed.
- the sheet fed from the sheet feeding unit may generate skew during conveyance.
- the leading end of the conveyed sheet is brought into contact with the nip portion of the registration roller pair 120 which is stopped, and the sheet leading end is nipped while forming a loop on the sheet.
- a skew correction device for correcting the skew of the sheet.
- the amount of loop formed on the sheet is adjusted by feeding a predetermined amount of sheet by the roller pair disposed upstream of the registration roller pair 120 after the sheet passes the registration sensor 141 .
- FIG. 1 is a perspective view of a skew feeding correction device 116 according to a first embodiment of the present invention, provided in the middle of a conveyance path connecting sheet feeding cassettes 111 and 112 and an image forming unit.
- a first upper roller 115a having a roller made of polyacetal (POM) and a first lower roller 115b formed of a rubber roller are disposed opposite to each other in the first roller pair 115 provided in the conveyance path.
- the first upper roller 115a is swingably supported by a lever or the like, and is in pressure contact with the first lower roller 115b by the elastic force of a spring (not shown).
- the second roller pair 114 provided upstream of the first roller pair 115 is a second upper roller 114a having a roller made of polyacetal (POM), and a second roller formed of a rubber roller
- the two lower rollers 114 b are disposed to face each other.
- the second upper roller 114a is swingably supported by a lever or the like, and is in pressure contact with the first lower roller 114b by the elastic force of a spring (not shown).
- the registration roller pair 120 provided downstream of the first roller pair 115 and in contact with the leading end of the sheet conveyed to correct the skew of the sheet includes an upper roller 120a and a lower roller 120b. ing. Then, the leading edge of the sheet abuts along the nip portion between the upper roller 120 a and the lower roller 120 b so that the sheet skew is corrected.
- the upper roller 120a of the registration roller pair 120 has a roller made of polyacetal (POM), the lower roller 120b is formed of a rubber roller, and the upper roller 120a and the lower roller 120b are disposed to face each other.
- the upper roller 120a is swingably supported by a lever or the like, and the upper roller 120a is in pressure contact with the lower roller 120b by the elastic force of a spring (not shown).
- Reference numeral 140 denotes a separation mechanism as a switching mechanism that switches the force of holding the sheet by the first roller pair 115.
- the separating mechanism 140 is configured to separate the first upper roller 115a of the first roller pair 115 from the first lower roller 115b, and by separating the first upper roller 115a from the first lower roller 115b, the sheet is separated.
- the clamping force can be zero.
- the separation mechanism 140 includes a first upper roller separation motor 145, an input gear 144, a driven shaft 143 supporting the first upper roller 115a, and a separation lever 142f for separating the first upper roller 115a from the first lower roller 115b. 142 r.
- the output gears of the first upper roller separation motor 145 mesh with the input gear 144, the input gear 144 is fixed to the end of the driven shaft 143, and the separation levers 142f and 142r fixed to the driven shaft 143 are the first It is in contact with the shaft of the upper roller 115a from below.
- reference numeral 62 denotes a first roller pair drive motor for driving the first lower roller 115b
- reference numeral 63 denotes a second roller pair drive motor for driving the second lower roller 114b.
- the controller 50 as a control unit is connected to the operation unit 200 and the size detection mechanism 130 of the image forming apparatus. Further, the controller 50 is connected to the registration sensor 141, the first upper roller separation motor 145, the registration motor 61, the sheet feed motor 54, the first roller pair drive motor 62, and the second roller pair drive motor 63.
- the controller 50 controls the separation mechanism 140 in order to switch the holding force of the first roller pair 115 based on the size of the sheet, the basis weight of the sheet, and the like (hereinafter referred to as sheet information).
- the controller 50 determines the necessity of separation of the first upper roller 115a based on sheet information designated by the user, sheet information detected by the size detection mechanism 130, or a combination thereof.
- the table shown in FIG. 6 shows an example of sheet information (sheet width, sheet basis weight) and necessity of separation of the first upper roller 115a from the first lower roller 115b. There is.
- the first upper roller 115a is separated from the first lower roller 115b, and in the case of ⁇ , the first upper roller 115a is not separated from the first lower roller 115b.
- the separation of the first upper roller 115a from the first lower roller 115b will be described as "the separation of the first roller pair 115".
- the necessity of separation of the first roller pair 115 is different from the width of the sheet.
- the width of the sheet is 100 mm or more and less than 279.4 mm, the first roller pair 115 is not separated, and when the sheet width is 279.4 mm or more and 330.2 mm or less, the first roller pair 115 is separated. .
- the necessity of separation of the first upper roller 115a is different depending on the width of the sheet.
- the width of the sheet is 100 mm or more and smaller than 210 mm, the first roller pair 115 is not separated, and when the sheet width is 210 mm or more and 330.2 mm or less, the first roller pair 115 is separated.
- the controller 50 determines the necessity of separation of the first roller pair 115, using the sheet width and the sheet basis weight as the sheet information.
- the present invention should not be limited to the above-described specific numerical values, but may use numerical values for determining the necessity of separation of the first roller pair 115 according to the characteristics of the apparatus.
- the sheet information is information on at least one of the type of sheet, the size of the sheet, and the basis weight of the sheet.
- the loop reaction force is weak. Therefore, since the force of the sheet contacting the registration roller pair is weak, a loop of a desired size can not be formed on the sheet, and it may not be possible to correct the skew of the sheet.
- the distance between the conveyance rollers is set at a distance that allows the sheet of the smallest size that the image forming apparatus can form, and for example, an example in which the rollers are arranged at this general distance is shown in FIG. Shown in. As shown in FIG. 14, when the distance between the registration roller pair 120 and the upstream roller pair 224 is arranged at a distance such that the sheet of the minimum size can be transported across the curved transport path, the swinging guide gap or the guide is connected.
- the first roller pair 115 is disposed between the registration roller 120 and the second roller pair 114 to solve the above problem.
- the sheet loop formed by the sheet conveyed from the roller pair provided upstream of the registration roller pair is in contact with the registration roller pair is formed by the registration roller pair and the upstream roller. It depends on the distance of the pair.
- the distance between the registration roller pair and the upstream roller pair is referred to as the distance between the rollers.
- the loop reaction force becomes smaller as the shape of the loop formed on the sheet becomes smoother and becomes larger as the shape of the loop becomes sharper.
- the distance between the rollers can be changed by separating and pressing the first roller pair 115 based on the sheet information. That is, in the first embodiment, the necessity of separation of the pair of first rollers 115 is determined based on the sheet information on the basis weight of the sheet, such as whether the sheet to be conveyed is thick sheet or thin sheet. Then, by changing the inter-roller distance, it is possible to form a loop of an appropriate amount for various types of sheets, and to improve the skew correction performance.
- FIGS. 2A to 2C and FIGS. 3A to 3C are schematic views showing a sheet skew correction operation when the first roller pair 115 is not separated.
- 2A-2C are top views
- FIGS. 3A-3C are side views
- FIGS. 2A-2C correspond to FIGS. 3A-3C.
- the entire leading end of the sheet in the conveyance direction A is a nip of the registration roller pair 120. Abuts the part. At this time, a loop is formed on the sheet between the registration roller pair 120 and the first roller pair 115. Thus, the skew of the sheet is corrected.
- the registration roller pair 120 is rotated, and the sheet S is conveyed in a state in which the skew is corrected as shown in FIGS. 2C and 3C.
- FIGS. 4A to 4C and FIGS. 5A to 5C are schematic views showing the skew feeding correcting operation of the sheet when the first roller pair 115 is separated.
- 4A-4C are top views
- FIGS. 5A-5C are side views
- FIGS. 4A-4C correspond to FIGS. 5A-5C.
- the skew correction operation in the case where the sheet is skewed to the left with respect to the conveyance direction A will be described.
- the sheet is transported in the transport direction A by rotation of the second roller pair 114 and the first roller pair 115. Then, before the leading end on the left side in the sheet conveyance direction A abuts on the nip portion of the registration roller 120 to form a loop, the first upper roller 115a is separated. At this time, the registration roller 120 has stopped rotating.
- the entire leading edge of the sheet in the transport direction A is the nip of the registration roller pair 120. It abuts on the part and a loop is formed on the sheet. Thus, the skew of the sheet is corrected. At this time, the first roller pair 115 is separated.
- the registration roller pair 120 rotates, and as shown in FIGS. 4C and 5C, the sheet S is conveyed in a state in which the skew feeding is corrected.
- the timing at which the first roller pair 115 separates may be any time before the sheet abuts against the nip portion of the registration roller pair 120 to form a loop, but in consideration of the conveyance stability, the leading end of the sheet is It is preferable that after passing the first roller pair 115. Further, the timing at which the first upper roller 115 a is in pressure contact with the first lower roller 115 b may be before the subsequent sheet is conveyed to the first roller pair 115.
- FIG. 9 shows a conveyance diagram of the leading end position of the sheet and a drive diagram of the registration motor 61, the first roller pair drive motor 62, and the second roller pair drive motor 63 corresponding to this.
- a user executes a print job from the operation unit 200 of the image forming apparatus or from the computer 201 connected directly to the image forming apparatus or via a network (Step 101).
- the user can specify the sheet information of the sheet to be used along with the number of print copies and the like.
- the size detection mechanism 130 can also detect sheet information.
- Step 102 the sheet feeding operation is started (Step 102), and the sheet is conveyed to the second roller pair 114, the first roller pair 115, and the registration sensor 141.
- the registration sensor 141 detects the conveyed sheet
- the first roller 115 and the second roller 114 stop rotating, and the sheet is temporarily stopped immediately before the nip portion of the registration roller pair 120 (Step 103). This is to bring the leading end of the sheet into contact with the nip of the registration roller pair 120 at a low speed.
- the controller 50 stores in advance a table as shown in FIG. 6 in which the sheet information and the necessity of separation of the first roller pair 115 are associated with each other. Then, the controller 50 refers to the table to determine whether or not separation of the first roller pair 115 is necessary (Step 104).
- the first upper roller separation motor 145 is driven while the sheet is stopped to separate the first upper roller 115a from the first lower roller 115b (Step 105) .
- the first roller pair 115 is not separated.
- Step 106 After the predetermined time has elapsed, the second roller pair 114 starts to rotate, and a skew correction operation is performed by forming a predetermined loop amount on the sheet (Step 106).
- the registration roller pair 120 and the second roller pair 114 are simultaneously restarted to maintain the skew corrected state, and the sheet to the downstream secondary transfer portion. Transport (Step 107).
- the registration roller pair 120, the first roller pair 115, and the second roller pair 114 are simultaneously started to convey the sheet.
- the sheet conveyed to the secondary transfer unit is subjected to image transfer onto the sheet and discharge operation (Step 108). Then, the presence or absence of the following sheet is determined (Step 109). If there is a subsequent sheet, and the first roller pair 115 is separated, the first upper roller separation motor 145 is driven again before the subsequent sheet rushes into the first roller 115 to complete the press-contact operation (Step 110). If there is no subsequent sheet, the print job is ended (Step 111).
- the distance between the rollers can be changed by separating and pressing the first roller pair 115 based on the sheet information. Then, by changing the inter-roller distance, it is possible to form a loop of an appropriate amount for various types of sheets, and to improve the skew correction performance.
- the present invention does not have to stop the sheet immediately before the nip portion of the registration roller pair . Also in this case, the same effect as described above can be obtained by separating the first roller pair 115 before the sheet is looped.
- FIG. 10 is a perspective view of a skew correction device 216 according to a second embodiment of the present invention.
- the second embodiment is different from the first embodiment only in the switching mechanism, and the other configuration is the same as the first embodiment, so the description of the same configuration and operation will be omitted.
- the separation mechanism 140 for separating the first upper roller 115a from the first lower roller 115b is used as the switching mechanism
- the pressing force variable mechanism 240 is used as the switching mechanism. Is used.
- the pressing force changing mechanism 240 switches the pressing force of the first roller 115a against the first lower roller 115b to switch the gripping force with which the first roller pair 115 grips the sheet.
- the variable pressing mechanism 240 includes an arm member 151 and a pressing force variable drive shaft 152, a torsion coil spring 153, a pressing force variable motor 154, a motor gear 155, and an input gear 156.
- the first upper roller 115a is rotatably supported by the arm member 151, and the arm member 151 is rotatably supported by the pressing force variable drive shaft 152.
- a torsion coil spring 153 is disposed between the arm member 151 and the pressing force variable drive shaft 152. One end of the torsion coil spring 153 is attached to the arm member 151, and the other end is attached to the pressing force variable drive shaft 152.
- variable pressing force motor 154 rotates clockwise, the variable pressing force drive shaft 152 rotates leftward via the motor gear 155 and the input gear 156, and the torsion coil spring 153 is compressed. As a result, the pressing force (gripping force) of the first upper roller 115a against the first lower roller 115b is increased.
- the magnitude of the pressing force can be adjusted.
- variable pressing force motor 154 is connected to the controller 50, and in order to switch the holding force of the first roller pair 115 based on the sheet information of the conveyed sheet, the variable pressing force motor 154 is controlled.
- the skew correction device 216 of the second embodiment switches the gripping force of the first roller pair 115 based on the sheet information conveyed by the controller 50.
- the variable pressing force mechanism 240 is controlled. Thereafter, a loop is formed on the sheet to correct the skew of the sheet.
- the pressing force of the first roller 115a is lowered by the pressing force variable mechanism 240, whereby the gripping force of the first roller pair 115 is lowered.
- the gripping force of the first roller pair 115 is set to a transportable gripping force when transporting the sheet, and when switched so as to reduce the gripping force, the gripping force that allows the sheet to slip at the nip portion Set to
- the sheet in the case of the above-described thick paper and the like, the sheet is slipped at the nip portion and is turned by reducing the holding force of the first roller pair 115 when forming a loop in the sheet. It becomes easy to do. At that time, an appropriate loop is not formed only by the sheet slipping at the nip portion, but the sheet is the first roller pair 115 because the second roller pair 114 sandwiches the sheet and applies the conveying force. It is sent in the transport direction while turning at. Therefore, it is possible to form an appropriate amount of loop so that the leading end of the sheet abuts on the nip portion of the registration roller pair 120 and skew feeding is corrected.
- the second embodiment can improve the skew correction performance of the sheet as in the first embodiment. Furthermore, in the second embodiment, since the first roller pair 115 is not completely separated, it does not take time for the separation / attachment operation of the first roller pair 115.
- the skew correction performance of the sheet can be improved without reducing the productivity.
- the sheet information and the necessity of switching the pressing force of the first roller 115a by the pressing force variable mechanism 240 can be determined as in the first embodiment. Further, the flow of the skew feeding correcting operation of the sheet by the skew feeding correcting device 216 of the second embodiment can be performed in the same manner as the first embodiment.
- FIG. 11 is a perspective view of a skew correction device 316 according to a third embodiment of the present invention.
- the third embodiment is different from the first embodiment only in that the skew correction device 316 has a loop space variable mechanism 160, and the other configuration is the same as the first embodiment, so the description will be omitted. .
- the loop space variable mechanism 160 includes a rocking guide shaft 161, a rocking guide 162 fixed to the rocking guide shaft 161, a rocking motor 163, and a motor gear 164 fixed to an output shaft of the rocking motor 163. , And an input gear 165 fixed to the rocking guide shaft 161.
- the input gear 165 is in mesh with the motor gear 164, and the rotation of the rocking motor 163 rotates the rocking guide shaft 161 to rock the rocking guide 162.
- the loop space variable mechanism 160 is configured to move the swinging guide 162 forming the sheet conveyance path in a direction to widen to increase the loop space that allows the loop formed on the sheet.
- the swinging guide shaft 161 is rotatably supported by an apparatus main body frame (not shown).
- the rocking guide drive motor 163 When the rocking guide drive motor 163 is rotated counterclockwise (counterclockwise), the rocking guide shaft 161 is rotated clockwise (clockwise) through the motor gear 164 and the input gear 165, and the rocking guide 162 is rotated. As shown in FIG. 12B, it swings upward in FIGS. 12A and 12B.
- the swing guide drive motor 163 is rotated clockwise (clockwise)
- the swing guide 162 swings downward in FIGS. 12A and 12B as shown in FIG. 12A.
- the first upper roller 115a of the first roller pair 115 is held by the swinging guide 162, and swings the swinging guide 162 upward in conjunction with the separation / contact operation of the first upper roller 115a. Movement / downward rocking is performed.
- the sheet is conveyed to the first roller pair 115 and temporarily stopped immediately before the nip portion of the registration roller pair 120. Then, the sheet is temporarily stopped immediately before the nip portion of the registration roller pair 120 and then fed again and is abutted against the nip portion of the registration roller pair 120 to start forming a loop. And swinging of the swinging guide 162 in the upward direction. This is because if the swinging guide 162 is swung upward before the leading end of the sheet passes the first roller pair 115, the sheet is buckled and the leading end of the sheet abuts on the registration roller pair 120. It is because it may become impossible to touch.
- the sheet front end passes the first roller pair 115 to start the loop formation.
- the swinging guide 162 swings between them.
- the loop is formed after the rocking guide 162 is moved upward to expand the loop space. Therefore, the swing guide 162 does not inhibit the formation of a loop, and the sheet can form a loop of a desired size. Further, in the configuration of the third embodiment, it is possible to prevent an increase in loop reaction force due to the seat on which the loop is formed coming into contact with the swinging guide 162. As a result, according to the configuration of the third embodiment, the skew correction performance of the sheet can be improved.
- the sheet information, necessity of separation of the first roller 115a by the separation mechanism 140, and necessity of separation of the rocking guide 162 by the loop space variable mechanism 160 can be determined in the same manner as in the first embodiment. .
- the flow of the sheet skew correction operation by the skew correction device 316 of the first embodiment can be performed in the same manner as in the first embodiment.
- FIG. 13 is a side view of a skew correction device 416 according to a fourth embodiment of the present invention.
- the fourth embodiment differs from the first embodiment only in that the skew correction device 416 has a shutter member 171 as a contact portion, and the other configuration is the same as the first embodiment. I omit it.
- the leading end of the sheet is abutted against the nip portion of the stopped registration roller pair to correct the skew
- the planar shutter member 171 is used. Abut the front edge of the sheet to make skew correction.
- the shutter member 171 is disposed downstream of the first roller pair 115 and upstream of the registration roller pair 120.
- the shutter member 171 is protruded / retracted with respect to the conveyance path by a drive unit (not shown).
- a drive unit not shown.
- the shutter member 171 protrudes into the conveyance path, the leading end of the conveyed sheet abuts on the shutter member 171, and the skew feeding of the sheet is corrected. Thereafter, the shutter member 171 retracts from the conveyance path, and the sheet is conveyed to the registration roller pair 120, and then the sheet is conveyed to the image forming unit.
- the registration roller pair 120 only conveys the conveyed sheet to the image forming unit, and it is not necessary to stop and form a loop on the sheet.
- the shutter member may be disposed downstream of the registration roller pair 120.
- a separation mechanism for separating and abutting the registration roller pair 120 is required. That is, when the front end of the sheet is abutted against the shutter member 171, the registration roller pair 120 is separated. Then, after forming a loop on the sheet and correcting the skew feeding, the registration roller pair 120 is brought into pressure contact to hold the sheet, and after the shutter member 171 is retracted, rotation is started to convey the sheet to the image forming unit Do.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Registering Or Overturning Sheets (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
Abstract
Description
本発明は、シートを挟持してシートを搬送する第1ローラ対と、
前記第1ローラ対の上流に設けられ、シートを挟持してシートを搬送する第2ローラ対と、
前記第1ローラ対の下流に設けられ、シートの斜行を補正するために搬送されるシートの先端が当接する当接部と、
前記第1ローラ対の挟持力を切り替える切り替え機構と、
シート情報に基づいて前記第1ローラ対の挟持力を切り替えるために、前記切り替え機構を制御する制御部と、
を有することを特徴とする斜行補正装置。
本発明によれば、切り替え機構が第1ローラ対の挟持力を切り替える。そして、制御部がシート情報に基づいて切り替え機構の挟持力を切り替えるために、切り替え機構を制御する。したがって、多様な種類のシートの斜行補正性能を向上することができる。
図15に、本発明の斜行補正装置が適用される画像形成装置の一例としてのカラーデジタルプリンタ概略断面図を示す。
給紙カセット111、112もしくは手差し給送部113のいずれかのシート給送部から給送されるシートは、第二ローラ対114及び第一ローラ対115により、レジストレーションローラ対120に向けて搬送される。中間転写体ベルト106上のトナー像は、レジストレーションローラ対120によって搬送されるシートと画像のずれが無いように制御される。トナー像は、二次転写外ローラ109によってシートに転写される。その後、トナー像は、定着装置110で加熱及び加圧されシートに定着される。その後、シートは排出部119aもしくは119bから装置本体の外へ排出される。
次に、本発明の斜行補正装置の第1の実施形態を説明する。
図1は、給紙カセット111、112と画像形成部とを結ぶ搬送経路の途中に設けられる、本発明の第1の実施形態である斜行補正装置116の斜視図である。
離間機構140は、第1上ローラ離間モータ145と、入力ギア144と、第1上ローラ115aを支持する従動軸143と、第1上ローラ115aを第1下ローラ115bから離間させる離間レバー142f、142rとを有する。第1上ローラ離間モータ145の出力ギアと、入力ギア144が噛み合っており、従動軸143の端部に入力ギア144が固定され、従動軸143に固定されている離間レバー142f、142rが第1上ローラ115aの軸に下側から当接している。
コントローラ50は、シートのサイズやシートの坪量等(以下、シート情報という)に基づいて第1ローラ対115の挟持力を切り替えるために、離間機構140を制御する。本実施形態においては、コントローラ50は、ユーザから指定されたシート情報または、サイズ検知機構130により検知されたシート情報もしくはこれらの組み合わせにより、第1上ローラ115aの離間の要否を判断する。
まず、第1ローラ対115が離間しない場合の斜行補正動作について説明する。
図4A~4Cおよび図5A~5Cは、第1ローラ対115が離間する場合のシートの斜行補正動作を示す模式図である。図4A~4Cは、上視図であり、図5A~5Cは側面図であり、図4A~4Cは図5A~5Cに対応する。
次に、本発明の第2の実施形態について説明する。図10は、本発明の第2の実施形態の斜行補正装置216の斜視図である。第2の実施形態は、切り替え機構のみが第1の実施形態と異なり、それ以外の構成は第1の実施形態と同じであるため同等の構成及び動作については、説明を省略する。
第2の実施形態の押圧力可変機構240について説明する。押圧力可変機構240は、アーム部材151と押圧力可変駆動軸152と、ねじりコイルばね153と押圧力可変モータ154とモータギア155と入力ギア156を有する。
一方、押圧力可変モータ154が左回りに回転すると、押圧力可変駆動軸152が右回りに回転し、ねじりコイルばね153による圧縮力が少なくなる。その結果、第1上ローラ115aの第1下ローラ115bに対する押圧力(狭持力)が低減される。
(第3の実施形態)
次に、本発明の第3の実施形態について説明する。図11は、本発明の第3の実施形態の斜行補正装置316の斜視図である。第3の実施形態は、斜行補正装置316がループ空間可変機構160を有する点のみが第1の実施形態と異なり、それ以外の構成は第1の実施形態と同じであるため説明を省略する。
次に、本発明の第4の実施形態について説明する。図13は、本発明の第4の実施形態の斜行補正装置416の側面図である。第4の実施形態は、斜行補正装置416が当接部としてのシャッター部材171を有する点のみ第1の実施形態と異なり、それ以外の構成は第1の実施形態と同じであるため説明を省略する。
115 第1ローラ対
120 レジストレーションローラ対
140 離間機構
240 押圧力可変機構
160 ループ空間可変機構
171 シャッター部材
Claims (8)
- シートを挟持してシートを搬送する第1ローラ対と、
前記第1ローラ対の上流に設けられ、シートを挟持してシートを搬送する第2ローラ対と、
前記第1ローラ対の下流に設けられ、シートの斜行を補正するために搬送されるシートの先端が当接する当接部と、
シートの先端が前記当接部に当接してシートにループを形成する前に前記第1ローラ対の挟持力を切り替える切り替え機構と、
シート情報に基づいて前記第1ローラ対の挟持力を切り替えるために、前記切り替え機構を制御する制御部と、
を有することを特徴とする斜行補正装置。 - 前記切り替え機構は、前記第1ローラ対を離間させる離間機構であり、前記離間機構は第1ローラ対を離間させることで、シートへの挟持力をゼロにすることを特徴とする請求項1に記載の斜行補正装置。
- 前記第1ローラ対は、第1上ローラと第1下ローラを有し、前記切り替え機構は、前記第1上ローラの前記第1下ローラに対する押圧力を切り替える押圧力可変機構であることを特徴とする請求項1に記載の斜行補正装置。
- シートの搬送経路を形成する揺動可能な揺動ガイドと、前記揺動ガイドを揺動させて、搬送経路中のループ空間を増大するループ空間可変機構を有することを特徴とする請求項1乃至3のいずれか1項に記載の斜行補正装置。
- 前記当接部は、レジストレーションローラ対のニップ部であることを特徴とする請求項1乃至4のいずれか1項に記載の斜行補正装置。
- 前記当接部は、シートの搬送経路に突出するシャッター部材であることを特徴とする請求項1乃至4のいずれか1項に記載の斜行補正装置。
- 前記シート情報は、シートのサイズとシートの坪量に関する情報であることを特徴とする請求項1乃至6のいずれか1項に記載の斜行補正装置。
- 請求項1乃至7のいずれか1項に記載の斜行補正装置と、
前記斜行補正装置によって斜行が補正されたシートに画像を形成する画像形成部を備えることを特徴とする画像形成装置。
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PCT/JP2011/077457 WO2013080291A1 (ja) | 2011-11-29 | 2011-11-29 | 斜行補正装置及び画像形成装置 |
CN201180075145.2A CN103958378B (zh) | 2011-11-29 | 2011-11-29 | 歪斜校正装置和成像设备 |
GB1410757.7A GB2511261B (en) | 2011-11-29 | 2011-11-29 | Skew Correcting device and image forming apparatus |
DE112011105897.7T DE112011105897T5 (de) | 2011-11-29 | 2011-11-29 | Schrägstellungskorrekturvorrichtung und Bilderzeugungsvorrichtung |
JP2013546872A JP5893642B2 (ja) | 2011-11-29 | 2011-11-29 | 斜行補正装置及び画像形成装置 |
US13/682,656 US8770581B2 (en) | 2011-11-29 | 2012-11-20 | Skew correcting device and image forming apparatus with separating mechanism |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5606486B2 (ja) * | 2012-04-09 | 2014-10-15 | キヤノン株式会社 | 斜行補正装置及び画像形成装置 |
JP5997529B2 (ja) * | 2012-07-24 | 2016-09-28 | 理想科学工業株式会社 | 給紙装置 |
JP2015020902A (ja) * | 2013-07-23 | 2015-02-02 | キヤノン株式会社 | 斜行補正装置及び画像形成装置 |
US9108811B1 (en) * | 2014-10-09 | 2015-08-18 | Xerox Corporation | Variably changing nip feeding speeds to maintain optimal sheet buckle |
JP6314948B2 (ja) * | 2015-10-05 | 2018-04-25 | コニカミノルタ株式会社 | 画像形成装置 |
JP2017159989A (ja) * | 2016-03-09 | 2017-09-14 | キヤノン株式会社 | シート搬送装置及び画像形成装置 |
JP6776710B2 (ja) * | 2016-08-08 | 2020-10-28 | コニカミノルタ株式会社 | 画像形成装置 |
JP7000064B2 (ja) * | 2017-08-02 | 2022-01-19 | キヤノン株式会社 | シート搬送装置及び画像形成装置 |
JP7187803B2 (ja) * | 2018-04-05 | 2022-12-13 | 富士フイルムビジネスイノベーション株式会社 | 画像形成装置 |
US11247859B2 (en) * | 2018-06-27 | 2022-02-15 | Canon Kabushiki Kaisha | Image forming apparatus having controlled sheet feeding |
JP7267717B2 (ja) * | 2018-11-20 | 2023-05-02 | キヤノン株式会社 | シート搬送装置及び画像形成装置 |
CN109665346B (zh) * | 2018-12-18 | 2021-03-16 | 北京小米移动软件有限公司 | 纸张输送机构的纸张纠偏方法及打印机 |
CN109677965A (zh) * | 2018-12-29 | 2019-04-26 | 厦门汉印电子技术有限公司 | 一种打印纸倾斜修正方法、装置、打印机和存储介质 |
JP2022083480A (ja) * | 2020-11-25 | 2022-06-06 | キヤノン株式会社 | シート搬送装置及び画像形成装置 |
JP2023146008A (ja) * | 2022-03-29 | 2023-10-12 | 富士フイルムビジネスイノベーション株式会社 | 媒体搬送装置及びこれを用いた媒体処理装置 |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3652083A (en) * | 1969-10-31 | 1972-03-28 | John Benton Inc | Paper feed mechanism |
JP2893540B2 (ja) * | 1989-09-06 | 1999-05-24 | 富士ゼロックス株式会社 | 画像形成装置 |
JPH06345294A (ja) | 1993-06-04 | 1994-12-20 | Canon Inc | 記録装置 |
DE69427018T2 (de) * | 1993-12-17 | 2001-08-23 | Canon Kk | Blatttransportgerät |
US5681036A (en) * | 1994-10-07 | 1997-10-28 | Canon Kabushiki Kaisha | Sheet feeding device with control of skew-correction |
US6059285A (en) * | 1996-12-18 | 2000-05-09 | Canon Kabushiki Kaisha | Sheet conveying apparatus |
JP3952572B2 (ja) * | 1998-01-26 | 2007-08-01 | 富士ゼロックス株式会社 | 画像形成対象シート搬送装置 |
US6585439B2 (en) * | 2000-12-15 | 2003-07-01 | Hewlett-Packard Development Company, L.P. | Printer media alignment apparatus and method |
JP3728216B2 (ja) * | 2001-04-12 | 2005-12-21 | キヤノン株式会社 | 画像形成装置 |
DE10244219B4 (de) * | 2001-10-15 | 2019-01-17 | Heidelberger Druckmaschinen Ag | Vorrichtung und Verfahren zur Bogenzufuhr an eine Bogenverarbeitende Maschine, insbesondere Druckmaschine |
US6805347B2 (en) * | 2002-11-18 | 2004-10-19 | Hewlett-Packard Development Company, L.P. | Deskew mechanism and method |
JP2005272021A (ja) * | 2004-03-22 | 2005-10-06 | Fuji Photo Film Co Ltd | 搬送装置及び画像記録装置 |
JP4469321B2 (ja) * | 2005-10-14 | 2010-05-26 | 株式会社リコー | 画像形成装置 |
JP4402130B2 (ja) * | 2007-03-29 | 2010-01-20 | 株式会社リコー | 搬送装置及び画像形成装置 |
JP5127472B2 (ja) * | 2008-01-22 | 2013-01-23 | 株式会社東芝 | シート搬送装置 |
JP2010143663A (ja) * | 2008-12-16 | 2010-07-01 | Seiko Epson Corp | スキュー補正装置及び記録装置 |
JP5282556B2 (ja) * | 2008-12-18 | 2013-09-04 | セイコーエプソン株式会社 | スキュー補正装置及び記録装置 |
JP5595366B2 (ja) * | 2010-12-15 | 2014-09-24 | キヤノン株式会社 | 斜行補正装置及び画像形成装置 |
JP2012240806A (ja) * | 2011-05-20 | 2012-12-10 | Konica Minolta Business Technologies Inc | 原稿搬送装置および画像形成装置 |
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US8770581B2 (en) | 2014-07-08 |
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