US3797929A - Gripper-bar bumper pads - Google Patents

Gripper-bar bumper pads Download PDF

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Publication number
US3797929A
US3797929A US00327865A US3797929DA US3797929A US 3797929 A US3797929 A US 3797929A US 00327865 A US00327865 A US 00327865A US 3797929D A US3797929D A US 3797929DA US 3797929 A US3797929 A US 3797929A
Authority
US
United States
Prior art keywords
gripper
drum
bar
bar means
copy sheets
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 - Lifetime
Application number
US00327865A
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English (en)
Inventor
G Deacon
J Toto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unisys Corp
Original Assignee
Sperry Rand Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sperry Rand Corp filed Critical Sperry Rand Corp
Application granted granted Critical
Publication of US3797929A publication Critical patent/US3797929A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6529—Transporting

Definitions

  • ABSTRACT An endless-chain transport system for a photocopy machine is described for gripping copy sheets at a paper-feed station, transporting the copy sheets past a photoconductive drum while holding surfaces of the copy sheets in close proximity to the drum, and transporting the copy sheets to a copy-sheet-delivery station.
  • the transport system comprises gripper bars mounted on transport chains having gripper jaws which are opened and closed by cams to grip and release the copy sheets.
  • Gripper-bar bumper pads are mounted on the gripper bars to hold the gripper bars away from the photoconductive drum.
  • GRIPPER-BAR BUMPER PADS BACKGROUND OF THE INVENTION transport system hasa gripper-bar mechanism mounted thereon to grip copy sheets and transportthern through a predetermined path.
  • the gripper bar grips copy sheets and pulls them past a photoconductive drum ,fwhere xerographic powder on the drum is transferred to the copy sheets.
  • the gripper bar should move clos ely past the drum, but yet not scrape the drum and thereby damage it.
  • At least one prior-art patent solves this problem by positioning a gripper below the pitch line of endless transport chains whereby the gripper bar, as it passes beneath a drum, will not jam against the peripheral surface of the drum (Column 6, lines I through 6, Eichom et al. US. Pat. No. 3,199,866).
  • the gripper bar is not positively held away from the drum.
  • a gripper bar for a photocopy-machine papensheet transport system which can pass closely to a photoconductive drum, but yet not scrape or otherwise damage, the drum.
  • relatively soft bumper pads are mounted at each end on'the top surface of a gripper bar to come in contact with a photoconductive drum at a non-critical outside edge area and thereby hold hard portions of the gripper bar away from the critical center area of the drum.
  • the gripper bar comprises a plurality of jaws which are individually cam actuated.
  • FIG. 1 is asimplified side elevation; of! a; photocopy machine which employs gripper bar-r bumper pads. of this invention
  • FIG. 2 is anisometric view of'a. portion ofthe. photo-- copy machine ofFIGI l which includes at. gripper bar: assembly having bumper pads mounted thereon;
  • FIG. 3 is a sectional viewtaken on. line 3-3 in FIG. I
  • FIG. 4 is a sectional view taken-on. line 4-4- in FIG. 2.
  • FIGS. 1 and 2 there is shown: thegeneral outline of a photocopy machine comprising basically a photoconductive drum11land twoparallel pa. per-sheet transport chains-13 Gripper-bar assemblies ls5are mounted between the paper-sheet transport chains 13.
  • The: gripper ba'rassernblies 15, as they are transportedby the paper-sheettransport chains 13in the directionindicated by an arrow i 7, grip copy sheets 19 at a. paper-feed. station. 11' and transport thempast the photoconduc tive drum III 3E3. powder transferstationZZ.
  • the art ⁇ As. is well know in" the art ⁇ .
  • the photoconductive drum. has'xerographic. powder images formed thereon which are transferred to the copy sheet 19 as they move throughthepowder trans fer station and theselrnages arefused onto the copysheets 19 by a fuser 23. These copiesare then delivered to a copy-sheet-delivery station. 25 where they-are released by the gripper-bar assemblies 1'5.
  • Variouswork stations for the photoconductivedrum II are labeled. on FIG. 1; however. the method by which the photoconductive drum 11 transfers images is well. known; and, therefore, not described herein.
  • each gripper bar assembly 15 mainly comprises: a metallic gripper bar frame 27, metallic movable jaws 29and bumper pads 31.
  • the gripper bar frame 27 is attached tothe chains 13 byany suitable fastening means.
  • a single stationary jaw 33 is formed out of a portion of the gripper-bar frame 27.
  • the movable jaws. 29 arerotatably mounted to the gripper-bar frame 27 on. a
  • pivot rod 35 and the pivot 35 is, in turn, mounted on tabs 37 which are integral with the gripper-bar frame 27.
  • Stops 36- are welded onto the movable jaws 29 and The stationary jaw as has gripper pads 39 mounted on the upper surfaces thereof which come in contact with the movablejaws'29', and. the movable jaws 29 are respectively biased by'springs' 40trwtrard the stationary jaw 33. It can be seen inFIG. 2 that each of the springs 40 is wrapped about the pivot rod 35 on both sides of a movable jaw 29, with a portion thereof extending over the respective movable jaw in mouse trap fashion. Each of the springs 40 is anchored in the gripper-bar frame 27 (FIG. 4) on both sides of a movable jaw.
  • Integral with the movable jaws 29 are gripper fingers 41 (FIGS. 3 and 4) which strike stationary cams 42 (FIG. 2) as the gripper bar assembly moves past the paper-feed station 21, thereby opening the movable jaws 29. Similar cams are positioned at the copy-sheetdelivery station 25 (FIG. 1), however. they are not shown in the drawings.
  • the lateral positions of the stationary cams 42 can be adjusted by loosening screws 43, sliding the cams laterally, and tightening the screws 43 on a mounting shaft 38. Copy sheets are held by the gripper bar between the gripper pads 39 and the movable jaw 29.
  • sprockets 16a are rigidly mounted on a shaft 44 along with guide members 45 so that the shaft 44, the sprockets 16a and the guide members 45 turn together.
  • the guide members 45 have slots 46 therein in which the gripper-bar assemblies 15 ride as they negotiate a turn defined by the sprockets 16a. It is during this turn that the movable jaws 29 are opened by the cams 42, which strike the gripper fingers 41, and these slots-help to stabilize the positions of the gripper-bar assemblies 15 as cbpy sheets are inserted between the movable jaws 29 and thestationary jaw 33.
  • the bumper pads 31 are soft" relative to other portions of the gripper-bar assemblies, such as the metallic gripperbar frame 27.
  • the bumper pads 31 are made of a plastic such as, for example nylon. Although it is hard relative to some foam or sponge plastics. it is soft relative to most metals and some very hard plastics. It is important that the bumper pads 31 be constructed of a material which is nonabrasive.
  • the bumper pads 31 are high enough so that they extend beyond the highest point 48 of other portions of the gripper bar assembly and thereby form a protection gap 49 between the highest point 48 and the drum surface 47.
  • the bumper pads 31 are located so as to contact the photoconductive-drum surface outside the image area.
  • movable jaws 29 of the gripper-bar assemblies 15 are opened and closed by the stationary cams 42, which strike the gripper fingers 41, to grip copy sheets at the paperfeed station 21, transport them through the powder transfer station 22 and deliver them to the copy-sheet delivery station 25.
  • the bumper pads 31 make contact with the drum surface 47 andthereby prevent harder portions'of the gripper-bar assemblies 15 from contacting the drum surface. Further, if the drum surface 47 and the gripperbar assemblies 15 are moving at different speeds, the bumper pads 31 allow relative sliding between these two members without damaging the drum surface 47.
  • the bumper pads allow a non-synchronous relationship to exist between the photoconductive drum 1! and the paper-sheet transport chains 13 because the bumper pads allow the gripper-bar assemblies to register with the photoconductive drum 11 at a variety of locations about the circumference of the drum while positively preventing damage to the imaging area of the drum.
  • the gripper-bar assemblies could have various forms so long as they also include bumper pads which extend above hard" portions of the gripper-bar assemblies.
  • this system could be used with endless-belt type conveyors other than chain conveyors.
  • a gripper-bar means for gripping copy sheets and transporting said copy sheets past said photoconductive drum while holding surfaces of said copy sheets in close proximity to said drum;
  • said gripper-bar means includes, a bumper pad mounted on a side of said gripper-bar means which passes closest to size drum, saidbumper pad being of such a siz as to come into contact with said drum as said gripper-bar means passes said drum and to prevent contact between other portions of said gripper bar means and said drum, said bumper pad being of a material which is soft relative to said other portions of said gripper bar and non-abrasive to said photoconductive drum.
  • said endless-belt transport system comprises two chains between which said gripper-bar means is mounted;
  • said gripper-bar means comprises:

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Discharge By Other Means (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
US00327865A 1973-01-29 1973-01-29 Gripper-bar bumper pads Expired - Lifetime US3797929A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US32786573A 1973-01-29 1973-01-29

Publications (1)

Publication Number Publication Date
US3797929A true US3797929A (en) 1974-03-19

Family

ID=23278411

Family Applications (1)

Application Number Title Priority Date Filing Date
US00327865A Expired - Lifetime US3797929A (en) 1973-01-29 1973-01-29 Gripper-bar bumper pads

Country Status (7)

Country Link
US (1) US3797929A (enrdf_load_stackoverflow)
JP (1) JPS5116036A (enrdf_load_stackoverflow)
CA (1) CA996178A (enrdf_load_stackoverflow)
FR (1) FR2327578A1 (enrdf_load_stackoverflow)
GB (1) GB1399787A (enrdf_load_stackoverflow)
IT (1) IT1006767B (enrdf_load_stackoverflow)
NL (1) NL154604B (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3924849A (en) * 1973-04-26 1975-12-09 Fuji Xerox Co Ltd Paper gripping device for use with a chain driven paper carriage
US3948508A (en) * 1973-12-24 1976-04-06 Rank Xerox Ltd. Sheet delivery apparatus
US4109779A (en) * 1976-08-13 1978-08-29 Ncr Corporation Media positioning means for a printer
US4110025A (en) * 1975-09-22 1978-08-29 Ricoh Company, Ltd. Duplex electrostatic copying machine
US4269409A (en) * 1976-12-17 1981-05-26 Hoechst Aktiengesellschaft Original document transport mechanism for electrophotographic copying machines
US5128726A (en) * 1990-12-20 1992-07-07 Xerox Corporation Sheet transport system with improved gripping and registration mechanism
WO2004013704A1 (de) * 2002-07-30 2004-02-12 Ebe Hesterman Satellitendruckmaschine
EP4141567A1 (en) * 2021-08-25 2023-03-01 FUJIFILM Business Innovation Corp. Image forming apparatus
EP3974358A4 (en) * 2019-09-20 2023-06-28 Fujifilm Business Innovation Corp. Image-forming device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8421048D0 (en) * 1984-08-18 1984-09-19 Ratby Eng Ltd Gripper bar assemblies

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3199866A (en) * 1963-05-24 1965-08-10 Xerox Corp Sheet feed mechanism
US3578859A (en) * 1969-07-03 1971-05-18 Xerox Corp Mechanical stripping apparatus
US3663014A (en) * 1970-06-05 1972-05-16 Control Data Corp Retractable card gripper

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3199866A (en) * 1963-05-24 1965-08-10 Xerox Corp Sheet feed mechanism
US3578859A (en) * 1969-07-03 1971-05-18 Xerox Corp Mechanical stripping apparatus
US3663014A (en) * 1970-06-05 1972-05-16 Control Data Corp Retractable card gripper

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3924849A (en) * 1973-04-26 1975-12-09 Fuji Xerox Co Ltd Paper gripping device for use with a chain driven paper carriage
US3948508A (en) * 1973-12-24 1976-04-06 Rank Xerox Ltd. Sheet delivery apparatus
US4110025A (en) * 1975-09-22 1978-08-29 Ricoh Company, Ltd. Duplex electrostatic copying machine
US4109779A (en) * 1976-08-13 1978-08-29 Ncr Corporation Media positioning means for a printer
US4269409A (en) * 1976-12-17 1981-05-26 Hoechst Aktiengesellschaft Original document transport mechanism for electrophotographic copying machines
US5128726A (en) * 1990-12-20 1992-07-07 Xerox Corporation Sheet transport system with improved gripping and registration mechanism
WO2004013704A1 (de) * 2002-07-30 2004-02-12 Ebe Hesterman Satellitendruckmaschine
US20050150408A1 (en) * 2002-07-30 2005-07-14 Ebe Hesterman Satellite printing machine
EP3974358A4 (en) * 2019-09-20 2023-06-28 Fujifilm Business Innovation Corp. Image-forming device
EP4141567A1 (en) * 2021-08-25 2023-03-01 FUJIFILM Business Innovation Corp. Image forming apparatus
US12216427B2 (en) 2021-08-25 2025-02-04 Fujifilm Business Innovation Corp. Image forming apparatus having a pair of chains wound around a fixing roller and a transfer roller

Also Published As

Publication number Publication date
DE2343133A1 (de) 1974-08-08
FR2327578A1 (fr) 1977-05-06
JPS5116036A (en) 1976-02-09
NL154604B (nl) 1977-09-15
NL7401131A (enrdf_load_stackoverflow) 1974-07-31
DE2343133B2 (de) 1976-05-26
IT1006767B (it) 1976-10-20
GB1399787A (en) 1975-07-02
FR2327578B1 (enrdf_load_stackoverflow) 1978-03-24
CA996178A (en) 1976-08-31

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