EP0168690B1 - Führungsvorrichtung in einem Kopiergerät - Google Patents

Führungsvorrichtung in einem Kopiergerät Download PDF

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Publication number
EP0168690B1
EP0168690B1 EP19850107953 EP85107953A EP0168690B1 EP 0168690 B1 EP0168690 B1 EP 0168690B1 EP 19850107953 EP19850107953 EP 19850107953 EP 85107953 A EP85107953 A EP 85107953A EP 0168690 B1 EP0168690 B1 EP 0168690B1
Authority
EP
European Patent Office
Prior art keywords
guide plate
flat portion
paper
main flat
guide
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
Application number
EP19850107953
Other languages
English (en)
French (fr)
Other versions
EP0168690A3 (en
EP0168690A2 (de
Inventor
Masahiko Hisajima
Hiroshi Kimura
Yutaka Shigemura
Isao Yada
Yoichiro Irie
Kiyoshi Morimoto
Takashi Nagashima
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.)
Kyocera Mita Industrial Co Ltd
Original Assignee
Mita Industrial Co Ltd
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
Priority claimed from JP2844581A external-priority patent/JPS57145735A/ja
Priority claimed from JP3226581U external-priority patent/JPS6326360Y2/ja
Priority claimed from JP1981032266U external-priority patent/JPH0345233Y2/ja
Application filed by Mita Industrial Co Ltd filed Critical Mita Industrial Co Ltd
Priority to EP19850107953 priority Critical patent/EP0168690B1/de
Publication of EP0168690A2 publication Critical patent/EP0168690A2/de
Publication of EP0168690A3 publication Critical patent/EP0168690A3/en
Application granted granted Critical
Publication of EP0168690B1 publication Critical patent/EP0168690B1/de
Expired 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/44—Simultaneously, alternately, or selectively separating articles from two or more piles
    • 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
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/2064—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat combined with pressure

Definitions

  • This invention relates to a copying paper guiding device in a copying machine.
  • a sheet-like copying paper conveyed through a paper conveying passage has a toner image transferred thereon in a transfer zone, which image is then heat-fixed by a heat fixing device comprised of, for example, a pair of fixing rollers at least one of which is heated, and thereafter is discharged out of the housing of the copying apparatus while being guided by a paper guiding device.
  • a heat fixing device comprised of, for example, a pair of fixing rollers at least one of which is heated, and thereafter is discharged out of the housing of the copying apparatus while being guided by a paper guiding device.
  • a paper guiding device there is widely used a device of the type including a lower guide plate and an upper guide plate located opposite to each other and defining a paper moving passage therebetween.
  • This type of known paper guiding has, however, an important problem associated with it. Specifically, since the copying paper is heated to a high temperature in the heat fixing device, the copying paper which is to enter the paper guiding device from the heat fixing device is kept at a correspondingly high temperature. When the paper at such a high temperature is introduced into the paper moving passage of the guiding device between the upper and lower guide plates, the space between the lower and upper guide plates is heated by the heat dissipated from the copying paper, and consequently, dew tends to form on the upper side of the lower guide plate and the lower side of the upper guide plate. The dew drops so formed may adhere to the paper advancing through the guide means, and the paper itself and the toner image formed on it are likely to be deteriorated. Moreover, the smooth movement of the paper may be hampered, and paper jamming is likely to occur.
  • a copying paper guiding device comprising a lower guide and an upper guide located opposite each other to define therebetween a path of movement for copying paper, the lower guide comprising a plurality of laterally spaced apart rising pieces which extend in the direction of movement of copying paper sheet along said path, and the upper guide comprising a plurality of laterally spaced apart hanging pieces extending in said direction of movement, the upper edges of the rising pieces co-operating with the lower edges of the hanging pieces to define said path of movement for the copying paper.
  • the mounting of the individual hanging and rising pieces in the known device results in a relatively complex and disadvantageous structure and it is an object of the present invention to provide a simpler structure which is more convenient to mount and dismount.
  • the lower guide is in the form of a guide plate having a main flat portion from which said rising pieces extend
  • the upper guide is in the form of a guide plate having a main flat portion from which the hanging pieces depend
  • a paper guiding device in accordance with the invention for guiding a paper sheet conveyed through the conveying passage, which is especially suitable for guiding a paper sheet from a heat-fixing device in the paper conveying passage to outside the housing of a copying machine.
  • the illustrated paper guiding device shown generally at 202 includes a lower guide plate 204 and an upper guide plate 206.
  • the lower guide plate 204 in the illustrated embodiment has a main flat portion 208, a curved portion 210 following the downstream end (the left end in Figure 3) of the main flat portion 208, and an upstanding portion 212 extending downwardly from the curved portion 210.
  • a downwardly extending hanging portion 214 is formed integrally at each side edge of the main flat portion 208.
  • the lower guide plate 204 is fixed in position in relation to the housing of a copying machine by keying the hanging portion 214 by means of a respective setscrew 218 to the inner surface of each of a pair of upstanding partitioning plates 216 disposed laterally in spaced-apart relationship within the housing of the copying machine, as shown in Figure 4.
  • To the upper sides of the two opposite side edges of the main flat portion 208 of the lower guide plate 204 are respectively keyed by means of setscrews 222 side plates 220 which extend upwardly from the upper sides substantially perpendicularly.
  • elongate oblique groove-like notches 224 are respectively formed which extend respectively from the upper edges of the side plates 220 in the upstream direction downwardly and inclinedly.
  • Inwardly projecting pins 226 are firmly set respectively at the downstream ends portions (i.e., the left-hand end portions in Figure 3) of the side plates 220.
  • the upper guide plate 206 has a main flat portion 228, and at the opposite side edges of the main flat portion 228, there are respectively formed as an integral unit side plates 230 which extend downwardly therefrom substantially perpendicularly.
  • Outwardly projecting pins 232 are firmly set respectively at the upstream end portions (i.e., the right-hand end portions in Figure 3) of the side plates 230.
  • the downstream ends (i.e., the left-hand end portions in Figure 3) of the side plates 230 have respectively formed therein groove-like notches 234 which extend upwardly from the lower edges of the side plates 230.
  • Grip portions 236 projecting in the downstream directions are also respectively formed in the downstream ends of the side plates 230.
  • the upper guide plate 206 described above can be detachably mounted in position on the lower guide plate 204 by operating the aforesaid grip portions 236 so as to position the upper guide plates 206 above the lower guide plate 204 with its side plates 230 being interposed between the side plates 220 of the lower guide plate 204, then moving the upstream end portions of the side plates 230 downwardly in the upstream direction to insert the pins 232 in the notches 224 formed in the upstream end portions of the side plates 220 of the lower guide plate 204, and thereafter moving the downstream end portions of the side plates 230 downwardly to bring the notches 234 into engagement with the pins 226 firmly set at the downstream end portions of the side plates 220 of the lower guide plate 204.
  • a plurality of rising pieces 238 should be provided laterally in spaced-apart relationship on the upper side of the main flat portion 208 of the lower guide plate 204, said rising pieces extending upwardly from the upper side of the main flat portion 208 in the moving direction of a copying paper (to the left and right in Figure 3), and that corresponding to these rising pieces, the lower side of the main flat portion 228 of the upper guide plate 206 should have formed thereon a plurality of hanging pieces 240 which are disposed laterally in spaced-apart relationship and extend downwardly from the lower side of the main flat portion 228 in the moving direction of the copying paper.
  • each rising piece 238 is provided laterally at suitable intervals on the upper side of the main flat portion 208 of the lower guide plate 204.
  • the rising pieces 238 are fixed in position to the upper side of the main flat portion 208 by, for example, bonding the base portions of these rising pieces to the upper side of the main flat portion 208.
  • the rising pieces 238 extend upwardly from the upper side of the main flat portion 208 substantially perpendicularly over a predetermined range in the moving direction of the copying paper (i.e., to the right and left in Figure 3).
  • eight hanging pieces 240 are disposed laterally at suitable intervals on the lower side of the main flat portion 228 of the upper guide plate 206.
  • the hanging pieces 240 are fixed in position to the lower side of the main flat portion 228 by, for example, bonding their base portions to the lower side of the main flat portion 228. These hanging pieces 240 extend downwardly from the underside of the main flat portion 228 substantially perpendicularly over a predetermined range in the moving direction of the copying paper (i.e., to the left and right in Figure 3). As Figures 3 and 4 clearly show, the rising pieces 238 and the hanging pieces 240 co-operate with each other to define a paper moving passage therebetween.
  • the upper edges of the rising pieces 238 co-operate with the lower edges of the hanging pieces 240 to define a path of paper movement therebetween, and a paper 242 (see Figures 1 and 3) moving through the paper guiding device 202 is guided by the upper edges of the rising pieces 238 and the lower edges of the hanging pieces 240.
  • the upstream end portions (i.e., the right-hand end portions in Figure 3) of the upper edges of the rising pieces 238 are inclined downwardly in the upstream direction, and the upstream end portions of the lower edges of the hanging pieces 240 are inclined upwardly in the upstream direction, so that the copying paper 242 (see Figures 1 and 3) advancing between the upper edges of the rising pieces 238 and the lower edges of the hanging pieces 240 is surely and easily guided by these rising and hanging pieces.
  • the rising pieces 238 are formed separately from the main flat portion 208 of the lower guide plate 204 and fixed to the upper side of the main flat portion 208, and the hanging pieces 240 are likewise formed separately from the main flat portion 228 of the upper guide plate 206 and fixed to the lower side of the main flat portion 228, it is possible, if desired, to form the rising pieces 238 integrally with the main flat portion 208 as a unit and to form the hanging pieces 240 integrally with the main flat portion 228 as a unit.
  • openings 244 should be formed in the main flat portion 228 of the upper guide plate 206.
  • eight rectangular openings 244 in total are formed in the main flat portion 228 of the upper guide plate 206 between the hanging pieces 240 and between the hanging pieces 240 and the side plates 230.
  • these openings 244 are as large as possible so long as they do not affect the rigidity and strength of the upper guide plate 206, the bonding of the hanging pieces 240 to the lower side of the main flat portion 228, etc.
  • a rectangular opening 246 be formed in each of the hanging pieces 240 themselves. Such openings 246 are also preferably as large as possible so long as they do not affect the rigidity and strength of the hanging pieces 240, etc.
  • the paper guiding device 202 shown in the drawings further comprises a delivery roller unit 248 disposed upstream (on the right in Figure 3) of the paper moving passage defined by the upper edges of the rising pieces 238 and the lower edges of the hanging pieces 240, and a discharge roller unit 250 disposed downstream (on the left in Figure 3) of the paper moving passage, as shown clearly in Figure 3.
  • the delivery roller unit 248 is comprised of a plurality (5 in the drawing) of driven rollers 254 mounted on a driven shaft 252 at suitable intervals in the lateral direction and a plurality (5 in the drawing) of follower rollers 258 mounted on a follower shaft 256 correspondingly to the driven rollers 254.
  • the discharge roller unit 250 is comprised of a plurality (3 in the drawing) of driven rollers 262 mounted on a driven shaft 260 at suitable intervals in the lateral direction and a plurality (3 in the drawing) of follower rollers 266 mounted on a follower shaft 264 correspondingly to the driven rollers 262.
  • the driven shaft 260 of the discharge roller unit 250 is positioned below the curved portion 210 of the lower guide plate 204, but as can be easily understood from Figure 1, the driven rollers 262 mounted on the driven shaft 260 project upwardly through cuts formed in the curved portion 210.
  • the driven shaft 252 of the delivery roller unit 248 and the driven shaft 260 of the discharge roller unit 250 are rotatably supported on the pair of upstanding partitioning plates 216 ( Figure 4) disposed within the housing of the copying machine.
  • the follower shaft 256 of the delivery roller unit 248 and the follower shaft 264 of the discharge roller unit 250 are respectively inserted rotatably for free up-and-down movement in narrow slots 268 and 270 extending in the up-and-down direction and formed on the side plates 230 disposed on the opposite side edges of the upper guide plate 206.
  • the follower shaft 256 of the delivery roller unit 248 and the follower rollers 258 mounted on it and the follower shaft 264 of the discharge roller unit 250 and the follower rollers 266 mounted on it are biased downwardly by their own weights.
  • the follower rollers 258 of the delivery roller unit 248 are brought into abutment against the driven rollers 254, and the follower rollers 266 of the discharge roller unit 250 are brought into abutment against the driven rollers 262.
  • the follower shaft 256 of the delivery roller unit 248 and the follower shaft 264 of the discharge roller unit 250 may be resiliently biassed downwardly by suitable spring members (not shown).
  • the driven shaft 252 and the driven shaft 260 are drivingly connected to a suitable driving source (not shown) such as an electric motor through a suitable power transmission means (not shown), and the delivery roller unit 248 and the discharge roller unit 250 are rotated in the direction of an arrow in Figure 3 by the action of the driving source.
  • a suitable driving source such as an electric motor
  • a suitable power transmission means not shown
  • a charge-eliminating brush member 272 known per se is fastened by means of a setscrew 274 to the downstream end (i.e, the left-hand end in Figure 3) of the upper guide plate 206.
  • the lower end of the charge-eliminating brush member 272 contacts, or approaches the surface of the paper 242 ( Figures 1 and 3) discharged from the paper guiding device 202 by the action of the discharge roller unit 250, thereby to remove the residual charge from the paper 242.
  • the paper guiding device 202 is suitably used for guiding the paper 242 ( Figures 1 and 3) discharged from a heat-fixing device 276 and conducting it to outside the housing of the copying machine, although its function is not limited to this feature.
  • the paper guiding device 202 is provided adjacent to, and downstream of, a heat-fixing device 276 ( Figure 3).
  • the heat-fixing device 276 ( Figure 3), for example, includes a pair of heat-fixing rollers 278 ( Figures 1 and 3) at least one of which is adapted to be heated by a suitable heat source (not shown) such as an electric resistance heating wire provided in its interior.
  • the copying paper 242 is slightly pressed to fix the toner image formed on the paper.
  • the paper 242 discharged from the heat-fixing device 276 by the feeding action of the heat-fixing rollers 278 rotated in the direction of an arrow in Figure 3 is nipped by the delivery roller unit 248 of the paper guiding device 202 and sent to the paper guiding device 202 by the delivering action of the delivery roller unit 248. Then, the paper 242 is moved through the paper moving passage defined by the upper edges of the rising pieces 238 and the lower edges of the hanging pieces 240.
  • the paper 242 is carried away from the paper guiding device 202 by the discharging action of the discharge roller unit 250, and then discharged into a receiving tray (not shown) outside the housing of the copying machine through a discharge opening (not shown) formed on the end wall of the housing.
  • the paper 242 is heated to a considerably high temperature by the heating action of the pair of heat-fixing rollers 278, and therefore, the paper 242 to be introduced into the paper guiding device 202 is at a considerably high temperature.
  • the paper 242 at such a high temperature enters the space .between the lower guide plate 204 and the upper guide plate 206 of the paper guiding device 202, the space is heated by the heat dissipated from the paper 242.
  • the openings 244 are formed in the main flat portion 228 and the openings 246 are also formed in the hanging pieces 240, the heat dissipated from the paper 242 passed between the lower guide plate 204 and the upper guide plate 206 is effectively dissipated out of the paper guiding device 202 through these openings 246 and 244, and consequently, the moisture formation on the upper surface of the main flat portion 208, the under surface of the main flat portion 228, etc. can be effectively prevented.
  • the aforesaid relatively large drops of moisture do not form on the underside of the main flat portion 228 or on the hanging pieces 240 because openings are formed both on the main flat portion 228 and on the hanging pieces 240 to greatly reduce the heat capacity of the main flat portion 228 and the hanging pieces 240 and the actual areas of the underside of the main flat portion 228 and the side surfaces of the hanging pieces 240 on which dew could form are markedly decreased.
  • openings may also be provided in the main flat portion 208 of the lower guide plate 204 and/or the rising pieces 238 to dissipate the heat more effectively from the space between the lower guide plate 204 and the upper guide plate 206 to outside the paper guiding device 202 and thus to further reduce the likelihood of dew formation on the upper side of the main flat portion 208 of the lower guide plate 204 and/or the side surfaces of the rising pieces 238.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Paper Feeding For Electrophotography (AREA)

Claims (4)

1. Kopierpapier-Führungselement, das eine untere Führung (204) und eine obere Führung (206), die einander gegenüber angeordnet sind, um dazwischen eine Laufstrecke für das Kopierpapier festzulegen, aufweist, wobei die untere Führung (204) eine Vielzahl von in seitlichem Abstand angeordneten Standteilen (238), welche sich, in Richtung der Bewegung eines Kopierpapierblattes entlang der Laufstrecke erstrecken aufweist, wobei die obere Führung (206) eine Vielzahl von in seitlichem Abstand angeordneten Hängeteilen (240), welche sich in der Richtung der Bewegung erstrecken, aufweist, und wobei die oberen Enden der Standteile mit den unteren Enden der Hängeteile zusammenwirken, um dadurch die Laufstrecke für das Kopierpapier zu definieren, dadurch gekennzeichnet,
daß die untere Führung (204) die Form einer Führungsplatte hat, die einen flachen Hauptteil (208) aufweist, von dem aus sich die Standteile (238) erstrecken,
daß die obere Führung (206) die Form einer Führungsplatte hat, die einen flachen Hauptteil (228) aufweist, von dem aus die Hängeteile (240) herabhängen,
daß der flache Hauptteil (228) der oberen Führungsplatte ausgebildet ist mit Durchgangsboh-rungen (244),
daß die obere Führung (206) ablösbar an der unteren Führung (204) befestigt ist,
daß die Seitenplatten (220,230) an den entsprechenden gegenüberliegenden seitlichen Enden sowohl des flachen Hauptteils (208) der unteren Führungsplatte (204) als auch des flachen Hauptteils (228) der oberen Führungsplatte (206) angeordnet sind, und
daß die obere Führung (206) ablösbar befestigt ist an der unteren Führung (204), indem ein Zapfen (232) und eine Aussparung (234), die entsprechend an einem oberen Ende und an einem unteren Ende einer jeden Seitenplatte (230) der oberen Führung (206) vorgesehen sind, in Eingriff gebracht werden mit einer Aussparung (224) und einem Zapfen (226), die entsprechend an einem oberen Ende und an einem unteren Ende einer jeden Seitenplatte (220) der unteren Führung (204) vorgesehen sind.
2. Kopierpapier-Führungselement gemäß Anspruch 1, dadurch gekennzeichnet, daß die Aussparungen (224) der unteren Führung (204) ausgehend von den oberen Enden der Seitenplatten (220) sich schräg nach unten erstrecken, betrachtet in der in bezug auf die Laufstrecke des Kopierpapiers entgegengesetzten Richtung.
3. Kopierpapier-Führungselement gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Aussparungen (234) der oberen Führung (206) sich ausgehend von den unteren Enden der Seitenplatten (230) nach oben erstrecken.
4. Kopierpapier-Führungselement gemäß einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß in den Hängeteilen (240) entsprechende Durchgangsboh-rungen (246) ausgebildet sind.
EP19850107953 1981-03-02 1982-03-01 Führungsvorrichtung in einem Kopiergerät Expired EP0168690B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19850107953 EP0168690B1 (de) 1981-03-02 1982-03-01 Führungsvorrichtung in einem Kopiergerät

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP2844581A JPS57145735A (en) 1981-03-02 1981-03-02 Feeder with forcibly restraining mechanism
JP28445/81 1981-03-02
JP3226581U JPS6326360Y2 (de) 1981-03-10 1981-03-10
JP32266/81 1981-03-10
JP1981032266U JPH0345233Y2 (de) 1981-03-10 1981-03-10
JP32265/81 1981-03-10
EP19850107953 EP0168690B1 (de) 1981-03-02 1982-03-01 Führungsvorrichtung in einem Kopiergerät

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP82301022.8 Division 1982-03-01

Publications (3)

Publication Number Publication Date
EP0168690A2 EP0168690A2 (de) 1986-01-22
EP0168690A3 EP0168690A3 (en) 1986-02-19
EP0168690B1 true EP0168690B1 (de) 1988-11-23

Family

ID=27440810

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850107953 Expired EP0168690B1 (de) 1981-03-02 1982-03-01 Führungsvorrichtung in einem Kopiergerät

Country Status (1)

Country Link
EP (1) EP0168690B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2238302B (en) * 1989-11-21 1993-12-15 Ricoh Kk Sheet transporting device for an image recorder
JPH03214184A (ja) * 1990-01-18 1991-09-19 Fujitsu Ltd 像形成装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5465550A (en) * 1977-11-04 1979-05-26 Konishiroku Photo Ind Co Ltd Guide device for heat fixing device
JPS6049306B2 (ja) * 1977-12-28 1985-11-01 コニカ株式会社 定着装置の案内部材

Also Published As

Publication number Publication date
EP0168690A3 (en) 1986-02-19
EP0168690A2 (de) 1986-01-22

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