EP0045657B1 - Apparatus for registering sheets - Google Patents
Apparatus for registering sheets Download PDFInfo
- Publication number
- EP0045657B1 EP0045657B1 EP19810303553 EP81303553A EP0045657B1 EP 0045657 B1 EP0045657 B1 EP 0045657B1 EP 19810303553 EP19810303553 EP 19810303553 EP 81303553 A EP81303553 A EP 81303553A EP 0045657 B1 EP0045657 B1 EP 0045657B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- registration
- sheet
- sheets
- corner
- belt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/60—Apparatus which relate to the handling of originals
-
- 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
- B65H9/10—Pusher and like movable registers; Pusher or gripper devices which move articles into registered position
- B65H9/103—Pusher and like movable registers; Pusher or gripper devices which move articles into registered position acting by friction or suction on the article for pushing or pulling it into registered position, e.g. against a stop
-
- 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
- B65H2404/1114—Paddle wheel
Definitions
- This invention relates to apparatus for registering sheets in a corner defined by intersecting registration walls that form a 90° angle, including dual paddle wheels located in position adjacent respective registration walls to drive sheets into said corner, each of said paddle wheels having at least two blades, said blades being synchronised so that only one blade on one wheel contacts the sheets at a time whereby the sheets are forwarded into said corner by each of said paddle wheels acting on the sheet alternately.
- Apparatus according to the present invention is characterised in that said dual paddle wheels are each positioned with respect to the plane of rotation of the wheels at an angle of between 10° and 25° from its respective adjacent registration wall.
- the angles allow for smooth acquisition by the paddles and virtually eliminate paper jams, stalls and damage due to a perpendicular approach of paddles.
- the speed of the paddle is suitably greater than that of the incoming sheet speed which helps to prevent paper wrinkle and jams.
- Figure 1 schematically depicts the various components of an illustrative electrophotographic printing machine incorporating a document corner registration apparatus according to the present invention therein. It will become evident from the following discussion that the registration system is equally well suited for use in a wide variety of devices and is not necessarily limited to its application to the particular embodiment shown herein. For example, the apparatus of the present invention may be adapted for use in compilers or readily employed in non-xerographic environments and sheet registration in general.
- the electrophotographic printing machine employs a belt 10 having a photoconductive surface 12 deposited on a conductive substrate 14.
- photoconductive surface 12 is made from a selenium alloy with conductive substrate 14 being made from nickel.
- Belt 10 moves in the direction of arrow 16 to advance successive portions of photoconductive surface 12 sequentially through the various processing stations disposed about the path of movement thereof.
- Belt 10 is entrained around stripper roller 18, tension roller 20, and drive roller 22.
- Drive roller 22 is mounted rotatably in engagement with belt 10. Motor 24 rotates roller 22 to advance belt 10 in the direction of arrow 16. Roller 22 is coupled to motor 24 with a suitable means such a a belt drive.
- Drive roller 22 includes a pair of opposed spaced flanges or edge guides 26. Edge guides 26 are mounted on opposite ends of drive roller 22 defining a space therebetween which determines the desired predetermined path of movement for belt 10. Edge guide 26 extends in an upwardly direction from the surface of roller 22. Preferably edge guides 26 are circular members or flanges.
- Belt 10 is maintained in tension by a pair of springs (not shown), resiliently urging tension roller 20 against belt 10 with the desired spring force.
- Both stripping roller 18 and tension roller 20 are mounted rotatably. These rollers are idlers which rotate freely as belt 10 moves in the direction of arrow 16.
- a corona generating device As charging station A, a corona generating device, indicated generally by the reference numeral 28, charges photoconductor surface 12 of the belt 10 to a relatively high, substantially uniform potential.
- a suitable corona generating device is described in US-A-2,836,725, issued to Vyverberg in 1958.
- the charged portion of photoconductive surface 12 is advanced through exposure station B.
- an original document 30 is positioned face down upon transparent platen 32.
- Lamps 34 flash light rays onto original document 30.
- the light rays reflected from the original document 30 are transmitted through lens 36 from a light image thereof.
- the light image is projected onto the charged portion of the photoconductive surface 12 to selectively dissipate the charge thereon. This records an electrostatic latent image on photoconductive surface 12 which corresponds to the informational areas contained within original document 30.
- belt 10 advances the electrostatic latent image recorded on photoconductive surface 12 to development station C.
- a magnetic brush developer roller advances a developer mix into contact with the electrostatic latent image.
- the latent image attracts the toner particles from the carrier granules forming a toner powder image on photoconductive surface 12 of belt 10.
- Belt 10 then advances the toner powder image to transfer station D.
- a sheet of support material 46 is moved into contact with the toner powder image.
- the sheet of support material is advanced to transfer station D by a sheet feeding apparatus 42.
- sheet feeding apparatus 42 includes a feed roll 44 contacting the upper sheet 46 of the stack. Feed roll 44 rotates so as to advance the uppermost sheet from the stack into transport 91.
- the transport directs the advancing sheet of support material into contact with the photoconductive surface 12 of belt 10 in a timed sequence so that the toner powder image developed thereon contacts the advancing sheet of support material at transfer station D.
- Transfer station D includes a corona generating device which emits ions onto the backside of sheet 46. This attracts the toner powder image from the photoconductive surface 12 to sheet 46. After transfer, the sheet continues to move in the direction of arrow 52 onto a conveyor (not shown) which advances the sheet to fusing station E.
- Fusing station E includes a fuser assembly, indicated generally by the reference number 54, which permanently affixes the transferred toner powder image to sheet 46.
- fuser assembly 54 includes a heated fuser roller 56 and a backup roller 58.
- Sheet 46 passes between fuser roller 56 and backup roller 58 with the toner powder image contacting fuser roller 56. In this manner, the toner powder image is permanently affixed to sheet 46.
- sheet 60 guides the advancing sheet 46 to catch tray 62 for removal from the printing machine by the operator.
- Cleaning station F includes a rotatably mounted fibrous brush in contact with the photoconductive surface 12. The particles are cleaned from photoconductive surface 12 by the rotation of brush 64 in contact therewith. Subsequent to cleaning, a discharge lamp (not shown) floods photoconductive surface 12 with light to dissipate any residual electrostatic charge remaining thereon prior to the charging thereof for the next successive image cycle.
- Figure 1 shows a document corner registration system 70 that employs paddle wheels with more than one blade mounted on either side of a corner and making an angle of less than 90° with each other by a bent flexible shaft.
- This device enables effective registration of a wide range of sheet input positions and orientations by supplying two driving forces at large angles to each other.
- planar blades or paddles 80 are made of urethane, silicone or other flexible, frictional material and are maintained 90° out of phase with each other. Therefore, only one blade contacts the document through the drive sweep uninhibited by the second wheel. Preferably, the document contacts the upstream blade first to reduce registration time. However, registration will be completed for any document that comes under control of either paddle wheel.
- an improved corner registration system includes two adjacent but differently angled registration paddle wheels.
- Each of the paddle wheels is angled at 10° to 25° from its adjacent registration wall.
- the two wheels are synchronized so that only one blade on one wheel contacts the document at one time. In this way, the document is positively and rapidly worked into corner registration.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Registering Or Overturning Sheets (AREA)
- Holders For Sensitive Materials And Originals (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
Description
- This invention relates to apparatus for registering sheets in a corner defined by intersecting registration walls that form a 90° angle, including dual paddle wheels located in position adjacent respective registration walls to drive sheets into said corner, each of said paddle wheels having at least two blades, said blades being synchronised so that only one blade on one wheel contacts the sheets at a time whereby the sheets are forwarded into said corner by each of said paddle wheels acting on the sheet alternately.
- Modern advancement in high speed copying machines lead to early recognition that machine operators could not perform their normal functions at a speed commensurate with the speed of the copying machine, resulting in copy output from the machines much lower than the printing speed of the machine. To minimize operator involvement and allow maximum output from the printing machine, automatic features were needed.
- It is in answer to this need that the automatic corner registration system of the present invention is provided. Registration systems in the past have employed rollers to align first a front edge and subsequently the rear edge of a document as disclosed in U.S.-A-3,980,296. Another registration system is shown in U.S.-A-4,029,309. This registration system discloses the use of two orthogonal, out-of-phase, synchronized single paddle wheels for corner registration.
- Apparatus according to the present invention is characterised in that said dual paddle wheels are each positioned with respect to the plane of rotation of the wheels at an angle of between 10° and 25° from its respective adjacent registration wall. The angles allow for smooth acquisition by the paddles and virtually eliminate paper jams, stalls and damage due to a perpendicular approach of paddles. Also, the speed of the paddle is suitably greater than that of the incoming sheet speed which helps to prevent paper wrinkle and jams.
- An embodiment of the invention will now be described with reference to the accompanying drawings, in which:-
- Figure 1 is a schematic elevational view of an electrophotographic printing machine incorporating registration apparatus according to the present invention therein, and
- Figure 2 is a plan view of the registration apparatus of Figure 1.
- Figure 1 schematically depicts the various components of an illustrative electrophotographic printing machine incorporating a document corner registration apparatus according to the present invention therein. It will become evident from the following discussion that the registration system is equally well suited for use in a wide variety of devices and is not necessarily limited to its application to the particular embodiment shown herein. For example, the apparatus of the present invention may be adapted for use in compilers or readily employed in non-xerographic environments and sheet registration in general.
- As shown in Figure 1, the electrophotographic printing machine employs a
belt 10 having aphotoconductive surface 12 deposited on aconductive substrate 14. Preferably,photoconductive surface 12 is made from a selenium alloy withconductive substrate 14 being made from nickel.Belt 10 moves in the direction ofarrow 16 to advance successive portions ofphotoconductive surface 12 sequentially through the various processing stations disposed about the path of movement thereof.Belt 10 is entrained aroundstripper roller 18,tension roller 20, and drive roller 22. - Drive roller 22 is mounted rotatably in engagement with
belt 10. Motor 24 rotates roller 22 to advancebelt 10 in the direction ofarrow 16. Roller 22 is coupled to motor 24 with a suitable means such a a belt drive. Drive roller 22 includes a pair of opposed spaced flanges oredge guides 26.Edge guides 26 are mounted on opposite ends of drive roller 22 defining a space therebetween which determines the desired predetermined path of movement forbelt 10.Edge guide 26 extends in an upwardly direction from the surface of roller 22. Preferablyedge guides 26 are circular members or flanges. -
Belt 10 is maintained in tension by a pair of springs (not shown), resiliently urgingtension roller 20 againstbelt 10 with the desired spring force. Bothstripping roller 18 andtension roller 20 are mounted rotatably. These rollers are idlers which rotate freely asbelt 10 moves in the direction ofarrow 16. - With continued reference to Figure 1, initially a portion of
belt 10 passes through charging station A. At charging station A, a corona generating device, indicated generally by thereference numeral 28,charges photoconductor surface 12 of thebelt 10 to a relatively high, substantially uniform potential. A suitable corona generating device is described in US-A-2,836,725, issued to Vyverberg in 1958. - Next, the charged portion of
photoconductive surface 12 is advanced through exposure station B. At exposure station B, anoriginal document 30 is positioned face down upontransparent platen 32.Lamps 34 flash light rays ontooriginal document 30. The light rays reflected from theoriginal document 30 are transmitted throughlens 36 from a light image thereof. The light image is projected onto the charged portion of thephotoconductive surface 12 to selectively dissipate the charge thereon. This records an electrostatic latent image onphotoconductive surface 12 which corresponds to the informational areas contained withinoriginal document 30. - Thereafter,
belt 10 advances the electrostatic latent image recorded onphotoconductive surface 12 to development station C. At development station C, a magnetic brush developer roller advances a developer mix into contact with the electrostatic latent image. The latent image attracts the toner particles from the carrier granules forming a toner powder image onphotoconductive surface 12 ofbelt 10. -
Belt 10 then advances the toner powder image to transfer station D. At transfer station D, a sheet ofsupport material 46 is moved into contact with the toner powder image. The sheet of support material is advanced to transfer station D by asheet feeding apparatus 42. Preferably,sheet feeding apparatus 42 includes afeed roll 44 contacting theupper sheet 46 of the stack.Feed roll 44 rotates so as to advance the uppermost sheet from the stack intotransport 91. The transport directs the advancing sheet of support material into contact with thephotoconductive surface 12 ofbelt 10 in a timed sequence so that the toner powder image developed thereon contacts the advancing sheet of support material at transfer station D. - Transfer station D includes a corona generating device which emits ions onto the backside of
sheet 46. This attracts the toner powder image from thephotoconductive surface 12 tosheet 46. After transfer, the sheet continues to move in the direction ofarrow 52 onto a conveyor (not shown) which advances the sheet to fusing station E. - Fusing station E includes a fuser assembly, indicated generally by the reference number 54, which permanently affixes the transferred toner powder image to
sheet 46. Preferably, fuser assembly 54 includes a heatedfuser roller 56 and abackup roller 58.Sheet 46 passes betweenfuser roller 56 andbackup roller 58 with the toner powder image contactingfuser roller 56. In this manner, the toner powder image is permanently affixed tosheet 46. After fusing,sheet 60 guides the advancingsheet 46 to catchtray 62 for removal from the printing machine by the operator. - Invariably, after the sheet of support material is separated from the
photoconductive surface 12 ofbelt 10, some residual particles remain adhering thereto. These residual particles are removed fromphotoconductive surface 12 at cleaning station F. Cleaning station F includes a rotatably mounted fibrous brush in contact with thephotoconductive surface 12. The particles are cleaned fromphotoconductive surface 12 by the rotation of brush 64 in contact therewith. Subsequent to cleaning, a discharge lamp (not shown) floodsphotoconductive surface 12 with light to dissipate any residual electrostatic charge remaining thereon prior to the charging thereof for the next successive image cycle. - Referring now to the specific subject of the present invention, Figure 1 shows a document
corner registration system 70 that employs paddle wheels with more than one blade mounted on either side of a corner and making an angle of less than 90° with each other by a bent flexible shaft. This device enables effective registration of a wide range of sheet input positions and orientations by supplying two driving forces at large angles to each other. - More specifically, as shown in Figure 2, in order to achieve registration of documents with a wide range of skew angles and a side edge location when entering
document handler 70, a two paddle wheel system is provided. - The planar blades or
paddles 80 are made of urethane, silicone or other flexible, frictional material and are maintained 90° out of phase with each other. Therefore, only one blade contacts the document through the drive sweep uninhibited by the second wheel. Preferably, the document contacts the upstream blade first to reduce registration time. However, registration will be completed for any document that comes under control of either paddle wheel. - In operation,
documents 30 that are placed ontoplaten 32 are met by dualadjacent paddle wheels flexible shaft 73 and angled at 10° to 25° from itsadjacent registration wall paddle wheels drive motor 78 by any suitable means, such as, a switch triggered by the document. Themotor 78 in turn drivespulley 75 which is drivingly connected topulley 74 throughbelt 76. The driving ofpulley 74 turns cable orshaft 73 on which are mountedpaddle wheels - In conclusion, an improved corner registration system is disclosed that includes two adjacent but differently angled registration paddle wheels. Each of the paddle wheels is angled at 10° to 25° from its adjacent registration wall. Also, the two wheels are synchronized so that only one blade on one wheel contacts the document at one time. In this way, the document is positively and rapidly worked into corner registration.
Claims (1)
- Apparatus for registering sheets in a corner defined by intersecting registration walls (37, 38) that form a 90° angle, including dual paddle wheels (71, 72) located in position adjacent respective registration walls (38, 37) to drive sheets into said corner, each of said paddle wheels having at least two blades, said blades being synchronised so that only one blade on one wheel contacts the sheets at a time whereby the sheets are forwarded into said corner by each of said paddle wheels acting on the sheets alternately, characterised in that said dual paddle wheels (71, 72) are each positioned with respect to the plane of rotation of the wheels at an angle of between 10° and 25° from its respective adjacent registration wall (38, 37).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17477580A | 1980-08-04 | 1980-08-04 | |
US174775 | 1980-08-04 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0045657A1 EP0045657A1 (en) | 1982-02-10 |
EP0045657B1 true EP0045657B1 (en) | 1984-07-04 |
Family
ID=22637472
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19810303553 Expired EP0045657B1 (en) | 1980-08-04 | 1981-08-04 | Apparatus for registering sheets |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0045657B1 (en) |
JP (1) | JPS5758174A (en) |
BR (1) | BR8104963A (en) |
CA (1) | CA1162102A (en) |
DE (1) | DE3164566D1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4326026A1 (en) * | 1993-08-03 | 1995-02-09 | Kodak Ag | Device and method for the alignment of sheets |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4541626A (en) * | 1982-07-07 | 1985-09-17 | Xerox Corporation | Sheet registration apparatus and device |
DE4229425A1 (en) * | 1992-09-03 | 1994-03-10 | Kodak Ag | Device for stacking and aligning individually fed sheets |
DE19848972C2 (en) * | 1998-10-23 | 2002-08-29 | Oce Printing Systems Gmbh | Device for aligning sheets |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3630516A (en) * | 1970-03-23 | 1971-12-28 | Stromberg Datagraphix Inc | Sheet-feeding apparatus |
GB1427357A (en) * | 1973-03-01 | 1976-03-10 | Xerox Corp | Sheet feeding method |
US3963339A (en) * | 1974-09-05 | 1976-06-15 | Xerox Corporation | Sheet feeding apparatus |
US3980296A (en) * | 1975-05-30 | 1976-09-14 | International Business Machines Corporation | Duplicating machine employing image reversing optical paths with front edge document alignment on document input and output |
US4029309A (en) * | 1975-10-29 | 1977-06-14 | Xerox Corporation | Set transport and stacker |
US4179117A (en) * | 1977-12-30 | 1979-12-18 | International Business Machines Corporation | Paper alignment rollers |
-
1981
- 1981-06-22 CA CA000380308A patent/CA1162102A/en not_active Expired
- 1981-07-28 JP JP11837581A patent/JPS5758174A/en active Pending
- 1981-07-31 BR BR8104963A patent/BR8104963A/en unknown
- 1981-08-04 EP EP19810303553 patent/EP0045657B1/en not_active Expired
- 1981-08-04 DE DE8181303553T patent/DE3164566D1/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4326026A1 (en) * | 1993-08-03 | 1995-02-09 | Kodak Ag | Device and method for the alignment of sheets |
DE4326026B4 (en) * | 1993-08-03 | 2004-01-29 | Heidelberger Druckmaschinen Ag | Device for aligning sheets |
Also Published As
Publication number | Publication date |
---|---|
DE3164566D1 (en) | 1984-08-09 |
CA1162102A (en) | 1984-02-14 |
EP0045657A1 (en) | 1982-02-10 |
BR8104963A (en) | 1982-04-20 |
JPS5758174A (en) | 1982-04-07 |
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