EP0388851B1 - Blatt-Transportgerät - Google Patents

Blatt-Transportgerät Download PDF

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Publication number
EP0388851B1
EP0388851B1 EP90105136A EP90105136A EP0388851B1 EP 0388851 B1 EP0388851 B1 EP 0388851B1 EP 90105136 A EP90105136 A EP 90105136A EP 90105136 A EP90105136 A EP 90105136A EP 0388851 B1 EP0388851 B1 EP 0388851B1
Authority
EP
European Patent Office
Prior art keywords
sheet
guide means
transporting
guide
transporting path
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
EP90105136A
Other languages
English (en)
French (fr)
Other versions
EP0388851A3 (de
EP0388851A2 (de
Inventor
Toshiyuki Nagano
Masanari Shirai
Masashi Ohashi
Tatsuya Shiratori
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.)
Canon Inc
Original Assignee
Canon Inc
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 JP1067917A external-priority patent/JP2566646B2/ja
Priority claimed from JP1087462A external-priority patent/JP2568682B2/ja
Priority claimed from JP1105641A external-priority patent/JP2566650B2/ja
Priority claimed from JP1118093A external-priority patent/JP2566651B2/ja
Priority claimed from JP1154054A external-priority patent/JP2568691B2/ja
Priority claimed from JP1159312A external-priority patent/JP2568694B2/ja
Application filed by Canon Inc filed Critical Canon Inc
Publication of EP0388851A2 publication Critical patent/EP0388851A2/de
Publication of EP0388851A3 publication Critical patent/EP0388851A3/de
Publication of EP0388851B1 publication Critical patent/EP0388851B1/de
Application granted granted Critical
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
    • G03G15/6502—Supplying of sheet copy material; Cassettes therefor
    • G03G15/6514—Manual supply devices
    • 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
    • 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
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/23—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 specially adapted for copying both sides of an original or for copying on both sides of a recording or image-receiving material
    • G03G15/231—Arrangements for copying on both sides of a recording or image-receiving material
    • G03G15/232—Arrangements for copying on both sides of a recording or image-receiving material using a single reusable electrographic recording member
    • G03G15/234—Arrangements for copying on both sides of a recording or image-receiving material using a single reusable electrographic recording member by inverting and refeeding the image receiving material with an image on one face to the recording member to transfer a second image on its second face, e.g. by using a duplex tray; Details of duplex trays or inverters
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00367—The feeding path segment where particular handling of the copy medium occurs, segments being adjacent and non-overlapping. Each segment is identified by the most downstream point in the segment, so that for instance the segment labelled "Fixing device" is referring to the path between the "Transfer device" and the "Fixing device"
    • G03G2215/00379—Copy medium holder
    • G03G2215/00392—Manual input tray
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00367—The feeding path segment where particular handling of the copy medium occurs, segments being adjacent and non-overlapping. Each segment is identified by the most downstream point in the segment, so that for instance the segment labelled "Fixing device" is referring to the path between the "Transfer device" and the "Fixing device"
    • G03G2215/00417—Post-fixing device
    • G03G2215/0043—Refeeding path

Definitions

  • the present invention relates generally to an apparatus for transporting a sheet and, more particularly, to a sheet transporting apparatus provided with the function of transporting, for example, a sheet which is inserted one by one from the exterior by manual sheet insertion.
  • An electronic copying machine 100 of the conventional type shown in Fig. 1 is arranged to transport a sheet inserted by manual sheet insertion in the following manner.
  • a manual sheet insertion tray 101 is inclined to the outside, and a sheet-like transfer medium 102 is fed from the tray 101.
  • the transfer medium 102 is transported by paper feed rollers 103 and 105 and registration rollers 106 and passed toward a drum 110 through the gap between transfer guides 107 and 109.
  • the transfer medium 102 is separated from the drum 110 by a separation charger 112.
  • the transfer medium 102 is transported over a transport section 113 to a fixing roller section 115, in which the toner image is fixed.
  • the fixed transfer medium 102 is finally discharged to a discharge tray 116.
  • the transfer medium 102 is transported in the constant direction.
  • the transfer medium 102 which has passed through the fixing section 115 is conducted toward a double-sided/multiple-copy sheet transporting path 119 by a medium deflecting plate 117.
  • the transfer medium 102 passes over the path 119 and is again transported toward the drum 110 and the fixing roller section 115.
  • the discharge rollers 120 are reversed while discharging the transfer medium 102.
  • the transfer medium 102 is conducted by the medium deflecting plate 117 and is again transported toward the drum 110 over the transporting path 119.
  • a manual sheet insertion tray projects to the right, and a sheet accommodating tray (cassette) is set in a bottom portion of the copying machine on the front side thereof.
  • a double-sided/multiple-copy sheet transporting path is positioned above the sheet accommodating tray.
  • a sheet transporting apparatus which includes two sheet transporting paths which are positioned in mutually different planes and intersect each other at approximately right angles, and a pair of guide plates operable to move between the two transporting paths at the intersection thereof.
  • the sheet transporting apparatus further includes guide-plate driving means for moving said guide plates from either to the other of the two transporting paths, and sheet transporting means for transporting the sheet from either to the other of the two transporting paths by changing the direction of transportation of the sheet.
  • the present invention may also be applied to, for example, a double-sided/multiple copying machine of the type which includes a manual sheet insertion transporting path intersecting a part of a re-feeding transporting path at approximately right angles.
  • the re-feeding transporting path can also be used as a front-type manual sheet insertion transporting path, whereby the inner space of the copying machine can be remarkably reduced.
  • FIG. 3 is a detailed perspective view showing the first embodiment
  • Fig. 4 is a schematic perspective view showing the external appearance of a copying machine to which the first embodiment is applied
  • Fig. 5 is a vertical sectional, front elevational view of the copying machine of Fig. 4
  • Figs. 6A, 6B and 6C are schematic views showing the operation of the first embodiment.
  • a copying machine 1 is of a front-loading type which is provided with a manual sheet insertion port 2, a swingable manual sheet insertion tray 3 and a cassette 5 on the front side.
  • a single sheet 6 is fed from the cassette 5 by a pickup roller 7 and is then transported to registration rollers 10 by means of transport rollers 9.
  • the sheet 6 is synchronously registered with respect to an image formed on a drum 11 by the registration rollers 10, and is transported at a predetermined timing. Thereafter, the image formed on the drum 11 is transferred to the sheet 6 by a charger 12, and the sheet 6 is separated from the drum 11 by a separating charger 13.
  • the sheet 6 is transported over a transporting section 15 to a fixing section 16 for fixation purposes.
  • the sheet 6 having a single image copied on one side is discharged by discharge rollers 17.
  • the sheet 6 is transported to the double-sided/multiple-copy transporting path 20 by the flapper 19.
  • the sheet 6 is passed through the gap between a pair of guide plates 21 and 22 and again transported toward the registration rollers 10 by re-feeding rollers 23. Thereafter, a predetermined copying operation is performed.
  • Fig. 3 the pair of upper and lower rectangular guide plates 21 and 22, which have been explained in connection with Fig. 5, are rotatably secured to the main body of the copying machine 1 in parallel with each other by a pair of right and left pins 25.
  • a manual sheet insertion tray guide 26 is secured to the main body so that its upper surface becomes flush with the upper surface of the manual sheet insertion tray 3 which is open outward (refer to Fig. 4).
  • a lower guide 27 and an upper guide 29 are secured to the main body at a location which immediately follows the manual sheet insertion tray guide 26.
  • a pressure arm 31 is pivotally supported by pins 30 which are fixed to the main body at a location below the manual sheet insertion tray guide 26 and the lower guide 27. As shown in Fig. 6, the pressure arm 31 is arranged to move up and down by means of an eccentric cam 32 which is driven by a pulse motor or the like (refer to Fig. 9). Driven manual sheet insertion rollers 33, which are normally urged upwardly, are provided on an inner portion of the pressure arm 31, and push-up pieces 35 for pushing up the guide plate 22 are provided on the inner end portion of the pressure arm 31. The shaft of each roller 33 is supported so that it can move up and down and rotate about its axis in the slot 33a of the pressure arm 31.
  • driving rollers 36 for re-feeding transportation are rotatably fitted onto shafts which extend from front to rear, and are engaged and disengaged through a clutch (not shown) by a drive source (not shown).
  • the guide plate 22 is provided with openings 37, through which are corresponding driving rollers 36 are inserted.
  • Driven rollers 39 for re-feeding transportation which are formed integrally with shafts 40, are opposed to the respective driving rollers 36.
  • Brackets 41 each having a vertical slot 42 are secured to the guide plate 21, and the opposite ends of each shaft 40 are engaged with the engaging slots 42 and urged together with the driven rollers 39 in the downward direction by tension springs 43. Openings 45, through which the corresponding rollers 39 are inserted, are formed in the guide plate 21.
  • a roller release arm 46 having engaging portions below the shafts 40 is pivotally supported by a pivot pin 47 fixed to the guide plate 21, and one end 46a of the roller release arm 46 is formed to engage with the underside of a projecting piece 49 fixed to the main body.
  • Driving manual sheet insertion rollers 50 are disposed to insert through the upper guide 29 in the downward direction. The driving rollers 50 are rotated and opposed to the driven manual sheet insertion rollers 33 by the driving of a pulse motor or the like.
  • a reference guide 57 for guiding the manually inserted sheet 6 is formed substantially perpendicularly to the upper surface of the manual sheet insertion guide 26 on the right side thereof (as viewed in Fig. 3).
  • the outer end portion of the guide plate 21 is bent upwardly at substantially right angles to form a shutter portion 51.
  • the shutter portion 51 is provided with a sensor lever 52 which comes into contact with the leading edge of the sheet 6 when this leading edge strikes the shutter portion 51.
  • a photointerrupter 53 is combined with the sensor level 52 to effect sensing operation.
  • the upper guide 29 is provided with a sensor lever 55 and a photointerrupter 56 which is combined therewith to detect the trailing edge of the manually inserted sheet 6.
  • manual sheet insertion roller pairs each consisting of the driving roller 50 and the driven manual sheet insertion roller 33 are positioned within a region C through which the sheet 6 passes during the operation of double-sided copy or multiple copy.
  • the limit line D of the region C is shown by a dot-dashed line.
  • the eccentric cam 32 is held in its minimum eccentric position and the pressure arm 31 is kept in the lowermost position.
  • the left ends of the respective guide plates 21 and 22 which are supported by the push-up pieces 35 provided on the inner end portion of the pressure arm 31, are positioned below the upper surface of the manual sheet insertion tray guide 26, while the shutter portion 51 crosses the plane of the upper surface of the tray guide 26.
  • the re-feeding transportation driven and driving rollers 39 and 36 cooperate to perform a normal re-feeding operation. More specifically, neither of the driving and driven manual sheet insertion rollers 50 and 33, which are positioned in the region C through which the sheet 6 is passed for the purpose of double-sided copy or multiple copy, interferes with the sheet 6 during re-feeding.
  • an operator determines that neither double-sided copy mode nor multiple-copy mode is active, and opens the manual sheet insertion tray 3, which also serves as a cover, in the direction indicated by the arrow of Fig. 4. Then, the operator inserts the sheet 6 through the manual sheet insertion port 2 along the reference guide 57 in the direction of an arrow A until the leading edge of the sheet 6 strikes the shutter portion 51 (the leading edge of the sheet 6 presses the sensor lever 52 to switch the apparatus to a manual sheet insertion mode).
  • a manual-sheet-insertion start signal is generated by a button (not shown).
  • a control section causes the eccentric cam 32 to rotate through approximately 180 degrees, thereby moving the pressure arm 31 upward.
  • the guide plates 21 and 22 are rotated upwardly about the pins 25 by means of the push-up pieces 35 (refer to Fig. 3) to keep the upper surface of the guide plate 22 slightly below the upper surface of the lower guide 27.
  • the dimensions of the pressure arm 31 and the eccentric cam 32 are selected so that all the re-feeding transportation driving rollers 36 are positioned below the upper surface of the guide plate 22.
  • the driven manual sheet insertion rollers 33 are pressed, by upward urging force, against the corresponding driving manual sheet insertion rollers 50 via the manually inserting sheet 6 engaged with the shutter portion 51, while the shutter portion 51, hence the guide plate 21, moves upward.
  • the nips between the rollers 33 and 50 oppose the guide space defined between the guide plates 21 and 22.
  • the roller release arm 46 rotates about the pivot pin 47 to move an inner-side portion 46b upward, thereby moving up the shafts 40 against the downward urging force of the tensile spring 43.
  • the re-feeding transportation driven rollers 39 move to a position above the underside of the guide plate 21.
  • a signal is transmitted to the control section.
  • the control section drives the manual sheet insertion rollers 50 to transport the manually inserted sheet 6 toward the inner side at a predetermined speed.
  • the sheet 6 is transported by a predetermined distance and the driving and driven manual sheet insertion rollers 50 and 33 are stopped. This movement causes the trailing end of the sheet 6 to coincide with the limit line D of the region C described above.
  • control section receives a signal indicating that the drive source for driving the driving manual sheet insertion rollers 50 have stopped, the control section turns on a drive source for the eccentric cam 32 to cause it to rotate through approximately 180 degrees. As shown in Fig. 6C, the pressure arm 31 moves down and is reset to the state explained in connection with Fig. 6A.
  • the control section drives the re-feeding transportation driving and driven rollers 36 and 39 to transport the manually inserted sheet 6 in a direction substantially perpendicular to the direction of manual insertion (in the direction indicated by the arrow B of Fig. 3). Subsequently, the sheet 6 is again transported to an image forming region (including elements such as the drum 11, the fixing section 16) by means of the re-feeding rollers 23 (refer to Fig. 5) and the registration rollers 10.
  • the second embodiment differs from the above-mentioned first embodiment in that the roller release roller 46 have a different configuration.
  • Engagement arms 60 for engaging the respective shafts 40 from below extend in opposite directions.
  • the projecting piece 49 which has been shown as fixed to the main body in Fig. 3, is omitted and the end the projecting piece 49 for engagement with the projecting piece 49 is also omitted.
  • the pressure arm 31 extends so as to engage with the underside of each engagement arm 60.
  • the home position of the guide plates 21 and 22 is placed below the manual sheet insertion tray guide 26, the positional relationship therebetween may be reversed. More specifically, the pressure arm 31, the pins 30, the eccentric cam 32 and the like may be positioned above the manual sheet insertion tray guide 26 and the positional relation between the driving and driven manual sheet insertion rollers 50 and 33 may be reversed vertically. Accordingly, the guide plate 21 is moved down so as to take the position shown in Fig. 6B. Similarly, the positional relation between the re-feeding transportation driving and driven rollers 36 and 39 may be reversed vertically. With such an arrangement as well, it is possible to achieve the operation of manually inserting the sheet 6, as in the case of the first embodiment.
  • the guide plates 21 and 22 are urged downwardly, they are pressed against the pressure arm 31 to be free from vibration.
  • the guide plates 21 and 22 may be urged upwardly to be pressed against the pressure arm 31 disposed above the guide plates 21 and 22.
  • the guide plates 21 and 22 are arranged not integrally but separately, and they are pivotally supported by pins 63 and 65, respectively, each of which is rotatably supported by parallel links 61 and 62.
  • the rotational driving of the parallel links 61 and 62 serves the function of the pressure arm 31 and the eccentric cam 32 to move the guide plates 21 and 22 up and down. It is also possible to apply the remove pressure to and from the re-feeding transportation driven rollers.
  • the guide plates 21 and 22 may be formed as an integral arrangement and the pin 63 or 65 may be disposed on one side to pivotally support it.
  • the direction of transportation of a manually inserted sheet 6 is restricted by restricting means 51 which is formed from a part of guide means 21, 22, and the sheet 6 is then fed from a first transporting path 20 by means of the guide means 21, 22. Accordingly, it is possible to prevent the skew feed or imperfect feed of the sheet 6 so that images can be prevented from being formed in an offset manner.
  • the restricting means 51 is formed from a part of the guide means 21, 22, it is possible to provide a transporting apparatus of a simple structure, a small size and a low cost.
  • the sensor lever 55 and the photointerrupter 56 used for positioning the sheet 6 are disposed on the outer side of the guide plates 21 and 22 (on the upstream of the region C shown in Fig. 6).
  • an equivalent means may be disposed in the middle of or on the inner side of the region C.
  • a reference point is disposed on the inner side
  • a plurality of pairs of manual sheet insertion rollers may be disposed and a sensor may be provided for detecting the leading end of the sheet 6 which reaches the vicinity of the inner reference point.
  • the guide plates 21 and 22 are moved up and down to move the re-feeding transportation driving and driven rollers 36 and 39 into and out of the transporting path for the sheet 6, the driving and driven rollers 36 and 39 may be shifted independently.
  • Each of the above embodiments includes a control circuit such as that shown in Fig. 9.
  • the respective motors for actuating the eccentric cam 32, the driving manual sheet insertion rollers 36, and the driving manual sheet insertion rollers 50 are not shown.
  • the control section When the control section receives a signal indicating that the drive source for driving the driving manual sheet insertion rollers 50 have stopped, the control section turns on the drive source of the eccentric cam 32 to cause it to rotate through approximately 180 degrees. As shown in Fig. 6C, while the pressure arm 31 is moving down, the guide plates 21 and 22 reaches the position shown in Fig. 6A, but the shaft of the driven manual sheet insertion rollers 33 is positioned above the middle of the pressure arm 31. Accordingly, the rollers 33 are urged upward and pressed against the driving manual sheet insertion rollers 50. (This state corresponds to an intermediate state between the states show in Figs. 6B and 6C).
  • the manually inserted sheet 6 is first nipped between the rollers 50 and 33 and, then, while it is being transported from the rollers 50 and 33 to the rollers 36 and 39, it is nipped between the rollers 50 and 33 and the rollers 36 and 39. Accordingly, the manually inserted sheet 6 is continuously held.
  • Each of the aforesaid embodiments is arranged to continuously hold the manually inserted sheet 6 by means of the slots 33a of a selected length which are formed in the pressure arm 31.
  • the guide plate 22 is held on the guide plate 22 by evacuation.
  • the guide plate 22 has a multiplicity of holes 22a and a bellows 60 is secured to the underside of the guide plate 22 to enclose the holes 22a.
  • a duct 61 extending from the bellows 60 is secured to the copying machine 1, and a fan 62 is disposed in the extending end of the duct 61.
  • this fan 62 is actuated by a motor (not shown), the air in the duct 61 is discharged in the direction indicated by the arrow E of Fig. 10 to reduce the pressure in the duct 61.
  • the sheet 6 is held on the guide plate 22 by evacuation through the holes 22a.
  • the control section When the manually inserted sheet 6 is transported by means of the rollers 33 and 50 and the trailing edge of the sheet 6 reaches the limit line D, the control section receives a signal indicating that the drive source for actuating the rollers 50 has stopped, and actuates the motor of the fan 62 to cause it to rotate, thereby holding the sheet on the guide plate 22. A short time after the fan 62 starts to rotate, the control section turns on the drive source of the eccentric cam 32 to cause it to rotate through approximately 180 degrees. When the state shown in Fig. 6C is reached, the control section stops the drive source of the eccentric cam 32 and the motor of the fan 62 at the same time.
  • the fine adjustment of the length of each slot 33a which is needed in the above embodiments may be omitted.
  • the fourth embodiment may be combined with any of the aforesaid embodiments.
  • the sheet 6 is temporarily secured in position by holding means 33a, 33 or 62. Accordingly, the sheet 6 is transported without the risk of being offset from position, whereby the accuracy of transportation of the manually inserted sheet 6 is improved.
  • the present invention may be applied to, for example, a double-sided/multiple copying machine provided with the manually inserted sheet transporting path 26 which leads to a part of the re-feeding transporting path in the direction substantially perpendicular thereto.
  • the re-feeding transporting path 20 can also be used as a front manual sheet insertion transporting path so that substantial space savings can be achieved in the copying machine.
  • a fifth embodiment which includes transporting means provided on a cover member and switching will be explained below.
  • a manual sheet insertion opening is denoted by 121, and a manual sheet tray (cover member) 122 is pivotally supported by a shaft 123 so that it can rotate as indicated by the arrow A.
  • manual sheet insertion rollers 125 are disposed on the lower portion (as viewed in Fig. 11) of the manual sheet tray 122 and urged inwardly by spring means 126.
  • a projection 127 is provided on one side of the lower end portion of the manual sheet insertion tray 122 is placed into a horizontal open state (the position shown by a dot-dashed line), driving manual sheet insertion rollers 129, which are provided on the main body of the copying machine, are pressed against the driven rollers 125 and actuated by a drive source motor.
  • a member 130 for sensing the reference end (the trailing end) of transfer paper P is pivotally supported on the copying machine 1 on the outer side of the position of the driving rollers 129, and an interrupter 131 is disposed for sensing the reference end of the transfer paper P from the motion of the sensing member 130.
  • Guide plates 133 and 135 for guiding the transfer paper P are formed into an integral member and bracket means 136a is formed on the inner end thereof, the bracket means 136a being pivotally supported by a pin 136 fixed to the copying machine 1.
  • the guide plates 133 and 135 are held in a horizontal position, the center plane between is positioned below the upper surface of the open manual sheet insertion tray 122 which is in open position.
  • the manual sheet insertion guide 122 is opened, the inlet in the center plane between the guide plates 133 and 135 becomes substantially flush with the guide surface of the open manual sheet insertion guide 122.
  • a main-body transportation driving roller 137 is adapted to be actuated by a drive source motor, and is rotatably disposed on the copying machine 1 in such a manner that its axis extends from front to rear of the machine 1.
  • a pressure roller 139 is disposed in opposition to the driving roller 137 above the guide plate 133 so that it can move upward when the guide plate 133 tilts.
  • various mechanisms such as those shown in Figs. 3 and 7 may be utilized.
  • the pressure roller 139 may be moved up by tilting the guide plate 33 and turning on a solenoid or the like.
  • the pressure roller 139 may be attached to an arm pivotally supported by the copying machine 1 so that the tilting guide plate 133 moves up the arm.
  • a guide 140 is disposed on one side of the manual sheet insertion tray 122 so as to guide the side end of the manually inserted sheet 6.
  • the sensing means 132 is switched off to stop the pick-up roller 7 positioned in the cassette 5, thereby inhibiting feeding from the cassette 5.
  • the projection 127 tilts the integral guide plates 133 and 135 to oppose the center plane therebetween to the upper surface of the manual sheet insertion tray 122.
  • the main-body transportation driving roller 137 moves outward (downward) away from the guide plate 135, and the pressure roller 139 projects from at least the underside of the guide plate 133 to a small extent.
  • the manually inserted transfer paper P can be smoothly inserted into the gap between the guide plates 133 and 135, and the driven manual sheet insertion rollers 125 press against the corresponding driving rollers 129.
  • the leading end of the transfer paper P presses the sensing member 130 and the interrupter 131 is turned on to detect the insertion of the transfer paper P.
  • the driving manual sheet insertion rollers 129 are rotated to transport the transfer paper P.
  • the interrupter 131 is turned off and, in accordance with the interrupter-off signal generated at this time, the reference end of the transfer paper P is stopped at a main-body transportation reference line 141 of the transfer paper P.
  • the guide plates 133 and 135 are reset to the horizontal position, and the rollers 125 and 129 nip the transfer paper P and, simultaneously, the driven manual sheet insertion rollers 125 move away from the transporting path.
  • the sensing means 132 is turned on and, in accordance with the on signal generated at this time, the main-body transportation driving roller 137 is rotated to transport the manually inserted transfer paper P for the purpose of image formation.
  • the manual sheet insertion tray 122 may be formed integrally with the shaft 123 so that the shaft 123 can be rotated forward or backward by means of a motor 142 to achieve the above manual sheet insertion and the feeding of sheets from the main body.
  • the closing of the aforesaid manual sheet insertion tray 22 is utilized to effect the release of the manual sheet insertion device 25, 29, the shifting of the guide means 33, 35 to a first transporting path 19, the pressing of transporting means 37, 39, and the actuation of a sheet inserting device 3. Accordingly, it is possible to remarkably simplify the structure of a sheet transporting apparatus of the front manual sheet insertion type, and also to greatly reduce the cost. Since a second transporting path 22 for manual sheet insertion is substantially flush with the first transporting path 19 for transporting the sheet P, it is possible to reduce the required installation space without the need to increase the height of the machine. Moreover, since a manual sheet insertion opening 21 can be covered, dangers are prevented and the external appearance is improved.
  • Brackets 242 each having a rectangular configuration in cross section, are formed on the opposite sides of one end of each arm 246, respectively, and vertically extending slots 242a are formed in the respective legs of the bracket 242.
  • the shafts 40 of the driven re-feeding transportation rollers 39 are inserted through the corresponding slots 242a so as to be restricted in the lateral direction and slidable in the vertical direction.
  • the outer end 246a of the roller release arm 246 is arranged to engage with the underside of the projection 49 fixed to the main body of the copying machine 1.
  • the shafts 40 and the driven rollers 39 are urged downwardly by the respective tension springs 43, and the guide plate 21 has the openings 45 through which the corresponding rollers 39 project from the guide plate 21.
  • the eccentric cam 32 is held in its minimum eccentric position and the pressure arm 31 is kept in the lowermost position.
  • the left ends of the respective guide plates 21 and 22 which are supported by the push-up pieces 35 provided on the inner end portion of the pressure arm 31, are positioned below the upper surface of the manual sheet insertion tray guide 26, while the shutter portion 51 crosses the plane of the upper of the tray guide 26.
  • the re-feeding transportation driven and driving rollers 39 and 36 cooperate to perform a normal re-feeding operation. More specifically, neither of the driving and driven manual sheet insertion rollers 50 and 33, which are positioned in the region C used for double-sided/multiple-copy transportation, interferes with the sheet 6 during re-feeding.
  • a manual-sheet-insertion start signal is generated by a button (not shown).
  • the control section causes the eccentric cam 32 to rotate through approximately 180 degrees, thereby moving the pressure arm 31 upward.
  • the guide plates 21 and 22 are rotated upwardly about the pins 25 by means of the push-up pieces 35 (refer to Fig. 14) to keep the upper surface of the guide plate 22 slightly below the upper surface of the lower guide 27.
  • the dimensions of the pressure arm 31 and the eccentric cam 32 are selected so that all the re-feeding transportation driving rollers 36 are positioned below the upper surface of the guide plate 22.
  • the driven manual sheet insertion rollers 33 are pressed, by upward urging force, against the corresponding driving rollers 50 via the manually inserting sheet 6 engaged with the shutter portion 51, while the shutter portion 51, hence the guide plate 21, moves upward.
  • a rotation-completion signal is transmitted to the control section.
  • the control section drives the manual sheet insertion rollers 50 to transport the manually inserted sheet 6 toward the inner side at a predetermined speed (refer to Fig. 15B).
  • the sheet 6 is transported by a predetermined distance and the driving and driven manual sheet insertion rollers 50 and 33 are stopped. This movement causes the trailing end of the sheet 6 to coincide with the limit line D of the region C described above.
  • the state of the sheet 6 is as shown in Figs. 15C and 15D.
  • each shaft 40 is positioned at the bottoms of the respective slots 242a and is inclined along the inclined axis of the bottoms.
  • the driven re-feeding transportation rollers 39 nearest to the reference end of the sheet 6 (the limit line D), then the rollers 39 nearest to the reference end after the aforesaid rollers 39, and so on, are sequentially brought into pressure contact with the sheet 6.
  • each shaft 40 gradually rises from the bottom of the left-hand slot 242a (as viewed in Figs. 15A to 15D).
  • FIG. 16A and 16B A seventh embodiment of the present invention will be described below with reference to Figs. 16A and 16B.
  • the same reference numerals are used to denote members which have substantially the same arrangements and operations as those shown in Fig. 15, and no explanation thereof is given.
  • a frame 360 is secured to the upper guide plate 21, and a shaft 361 is horizontally supported by the frame 360 for rotation about its axis.
  • Opposing slots 363 and 365 are respectively formed in the front and rear sections of the frame 360 at a location below the shaft 361.
  • a shaft 362 is supported by the slots 363 and 365 in such a manner that it is axially restricted and vertically slidable, and three re-feeding transportation rollers 39 are fitted onto the shaft 362.
  • Engagement pieces 366 each have an approximately circular opening 367 at the top and a slot 369 communicating therewith at the bottom.
  • Eccentric cams 370 and 371 are secured to the shaft 361 and engaged with the openings 367 of the respective engagement pieces 366.
  • the shaft 362 is engaged with the bottom of each engagement piece 366.
  • the shaft 361 is driven by a motor 372 mounted on the rear section of the frame 360.
  • the eccentricities of the cams 370 and 371 are selected so that, as shown in Fig. 16B, as the guide plate 21 moves downward, the driven re-feeding transportation roller 39 positioned on the reference-end side of the sheet 6 (the left side in the drawing) initially comes into pressure contact with the sheet 6. More specifically, the motor 372 rotate the shaft 361, hence the eccentric cams 370 and 371, through 180 degrees at a time in timed relation to the eccentric cam 32 shown in Figs. 15A to 15D.
  • each of the embodiments shown in Figs. 15 and 16 utilizes as the reference end the left side of the sheet 6 as viewed in the corresponding drawing, the reference end may be set in the inner side of the region C used in double-sided/multiple-copy transportation. If this arrangement is adapted for the embodiment of Fig. 15, the rollers 39 can be pressed against the sheet 6 sequentially from the inner side by selecting the length or the position of each slot 242a of the bracket 242 shown in Figs. 15A to 15D. In the embodiment of Figs. 16A and 16B, it suffices to appropriately select the eccentricities of the eccentric cams 370 and 371.
  • a sheet 6 is transported to a first transporting path 26 by means of first transporting means 33, 50 and then to a second transporting path 20 by means of second transporting means 36, 39.
  • the second transporting means 36, 39 comes into pressure contact with the sheet 6 on the second transporting path 20 in sequence from the reference-end side thereof. Accordingly, even if the sheet 6 has wavy or slack portions, the slack is forced from the reference end to the sides other than it, whereby the sheet 6 can be accurately positioned on the second transporting path 20. It is accordingly possible to provide an image forming system capable of forming a faithful image and free from sheet clogging.
  • first transporting path 26 and the first transporting means 33, 50 are arranged as a front-loading type of manual sheet insertion mechanism, no space for sideways manual sheet insertion is required. Accordingly, it is possible to remarkably improve the ease of installation of the image forming system 1.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Manual Feeding Of Sheets (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Conveyance By Endless Belt Conveyors (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)

Claims (19)

  1. Eine Vorrichtung zum Transport eines Blatts (6; P), die umfaßt:
    - erste Führungsmittel (21, 22; 133, 135), die eine erste Transportbahn zur Führung des genannten Blatts zu einer Bilderzeugungssektion (10 - 13) hin bilden,
    - erste Transportmittel (36, 39; 137, 139) zum Transport des genannten Blatts längs der besagten ersten Transportbahn,
    - zweite Führungsmittel (26, 27, 29; 122, 140), die eine zweite Transportbahn zur Führung des genannten Blatts in einer zur besagten ersten Transportbahn querliegenden Richtung bilden, wobei die besagten ersten sowie zweiten Transportbahnen alternativ in der Höhenrichtung fluchtend oder nichtfluchtend sind,
    - zweite Transportmittel (33, 50; 125, 129) zum Transport des genannten Blatts längs der besagten zweiten Transportbahn zu den erwähnten ersten Führungsmitteln hin und
    - Steuereinrichtungen, um die besagten ersten sowie zweiten Transportbahnen so zu schalten, daß sie zum Transport des genannten Blatts von den erwähnten zweiten Führungsmitteln zu den erwähnten ersten Führungsmitteln ausgefluchtet sind, sobald das genannte Blatt durch die erwähnten zweiten Führungsmittel eingebracht wird.
  2. Eine Vorrichtung nach Anspruch 1, in welcher die erwähnten ersten Führungsmittel (21, 22; 133, 135) verstellt werden, um die besagte erste Transportbahn mit der besagten zweiten Transportbahn auszufluchten.
  3. Eine Vorrichtung nach Anspruch 1, in welcher die erwähnten zweiten Führungsmittel verstellt werden, um die besagte zweite Transportbahn mit der besagten ersten Transportbahn auszufluchten.
  4. Eine Vorrichtung nach Anspruch 1, in welcher die genannten Steuereinrichtungen dazu eingerichtet sind, die Steuerung im Ansprechen auf die Eingabe eines Manuell-Blatteinführung-Startsignals in Betrieb zu setzen.
  5. Eine Vorrichtung nach Anspruch 4, die ferner eine Manuell-Blatteinführung-Starttaste enthält.
  6. Eine Vorrichtung nach Anspruch 2, die ferner Mittel (30 - 32, 35; 62, 63, 65; 127) umfaßt, um die erwähnten ersten Führungsmittel (21, 22; 133, 135) auf- und abzubewegen, wobei die besagten Bewegungsmittel im Ansprechen auf ein Manuell-Blatteinführsignal betätigt werden.
  7. Eine Vorrichtung nach Anspruch 6, in welcher die besagten Bewegungsmittel (30 - 32, 35) einen drehenden Exzenternokken (32) enthalten.
  8. Eine Vorrichtung nach Anspruch 6, in welcher die besagte zweite Transportbahn mit einer Sperreinrichtung (51), um das genannte eingebrachte Blatt anzuhalten, versehen ist.
  9. Eine Vorrichtung nach Anspruch 8, in welcher die besagte Sperreinrichtung (51) an den erwähnten ersten Führungsmitteln (21, 22) angeordnet und dazu eingerichtet ist, sich aus ihrer Sperrposition herauszubewegen, wenn sich die erwähnten ersten Führungsmittel aufwärts bewegen.
  10. Eine Vorrichtung nach Anspruch 6, in welcher die erwähnten zweiten Transportmittel (33, 50; 125, 129) mit einem drehenden Bauelement (33; 125) ausgestattet sind, das sich auf- und abbewegt, wenn sich die erwähnten ersten Führungsmittel (21, 22; 133, 135) auf- und abbewegen, wobei das genannte drehende Bauelement betätigt wird, um das genannte Blatt (6) von den erwähnten zweiten Führungsmitteln (26, 27, 29; 122, 140) zu den erwähnten ersten Führungsmitteln zu transportieren, sobald die besagten ersten und zweiten Transportbahnen in Flucht sind.
  11. Eine Vorrichtung nach Anspruch 2, in welcher die erwähnten ersten Transportmittel ein Paar von vertikal angeordneten Bauteilen (36, 39; 137, 139) einschließen, wobei die genannten vertikal angeordneten Bauteile zueinander hin sowie voneinander weg mit den Abwärts- und Aufwärtsbewegungen der erwähnten ersten Führungsmittel (21, 22; 133, 135) verlagert werden.
  12. Eine Vorrichtung nach Anspruch 11, in welcher, sobald sich die erwähnten ersten Führungsmittel (21, 22; 133, 135) aufwärts bewegen und die besagten ersten sowie zweiten Transportbahnen ausgefluchtet sind, die erwähnten ersten Transportmittel (36, 39; 137, 139) sich aus der besagten ersten Transportbahn herausbewegen.
  13. Eine Vorrichtung nach Anspruch 2, die ferner Einrichtungen (33a; 22a, 60 - 62) umfaßt, um das genannte Blatt (6) an den erwähnten ersten Führungsmitteln (21, 22; 133, 135) festzuhalten, während die erwähnten ersten Führungsmittel bewegt werden.
  14. Eine Vorrichtung nach Anspruch 2, die ferner umfaßt:
    - Verschlußmittel (122), die selektiv betätigbar sind, um eine Manuell-Blatteinführöffnung (121) zu öffnen sowie zu verschließen, und
    - abhängig gekoppelte Elemente (127), um in Übereinstimmung mit dem Öffnen und Schließen der erwähnten Verschlußmittel die erwähnten ersten Führungsmittel auf- und abzubewegen, wobei
    - die erwähnten zweiten Transportmittel (125, 129) in der besagten zweiten Transportbahn angeordnet sowie betätigbar sind, um sich zueinander hin sowie voneinander weg zu bewegen, wenn sich die erwähnten Verschlußmittel öffnen und schließen.
  15. Eine Vorrichtung nach Anspruch 11, in welcher die erwähnten ersten Transportmittel (36, 39) eine Mehrzahl von in einer axialen Richtung angeordneten Bauteilen (39) enthalten, wobei die erwähnten ersten Transportmittel, sobald sie angehoben werden, eine Schräglage erhalten, so daß das zu den erwähnten zweiten Führungsmitteln (26, 27, 29) näherliegende Bauteil (39) der besagten ersten Transportbahn näher als die anderen Bauteile ist.
  16. Eine Vorrichtung nach Anspruch 15, in welcher, wenn sich die erwähnten ersten Transportmittel (36, 39) abwärts bewegen, die genannten Bauteile (39) beginnen, das genannte Blatt (6) in Aufeinanderfolge von dem den erwähnten zweiten Führungsmitteln (26, 27, 29) näherliegenden Bauteil aus einem Pressen auszusetzen.
  17. Ein Bilderzeugungsgerät, das eine Vorrichtung zum Transport eines Blatts nach einem der vorhergehenden Ansprüche sowie eine Bilderzeugungssektion (10 - 13) zur Erzeugung einer Abbildung an dem genannten, durch die erwähnten ersten Führungsmittel (21, 22; 133, 135) geführten Blatt (6) umfaßt.
  18. Ein Bilderzeugungsgerät nach Anspruch 17, in welchem die erwähnten ersten Führungsmittel (21, 22; 133, 135) dazu eingerichtet sind, ein Blatt (6) an dem eine Abbildung in der besagten Bilderzeugungssektion (10 - 13) erzeugt ist, zu der besagten Bilderzeugungssektion zurückzufördern.
  19. Ein Bilderzeugungsgerät nach Anspruch 18, in welchem die erwähnten zweiten Führungsmittel (26, 27, 29; 122, 140) dazu eingerichtet sind, ein von einer Frontseite des besagten Bilderzeugungsgeräts eingebrachtes Blatt (6) zu den erwähnten ersten Führungsmitteln (21, 22; 133, 135) hin zu führen.
EP90105136A 1989-03-20 1990-03-19 Blatt-Transportgerät Expired - Lifetime EP0388851B1 (de)

Applications Claiming Priority (12)

Application Number Priority Date Filing Date Title
JP1067917A JP2566646B2 (ja) 1989-03-20 1989-03-20 画像形成装置
JP67917/89 1989-03-20
JP1087462A JP2568682B2 (ja) 1989-04-06 1989-04-06 画像形成装置
JP105641/89 1989-04-24
JP1105641A JP2566650B2 (ja) 1989-04-24 1989-04-24 画像形成装置
JP118093/89 1989-05-10
JP1118093A JP2566651B2 (ja) 1989-05-10 1989-05-10 画像形成装置
JP154054/89 1989-06-15
JP1154054A JP2568691B2 (ja) 1989-06-15 1989-06-15 画像形成装置
JP159312/89 1989-06-21
JP1159312A JP2568694B2 (ja) 1989-06-21 1989-06-21 画像形成装置
JP87462/90 1990-04-06

Publications (3)

Publication Number Publication Date
EP0388851A2 EP0388851A2 (de) 1990-09-26
EP0388851A3 EP0388851A3 (de) 1991-05-02
EP0388851B1 true EP0388851B1 (de) 1995-01-25

Family

ID=27551085

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90105136A Expired - Lifetime EP0388851B1 (de) 1989-03-20 1990-03-19 Blatt-Transportgerät

Country Status (3)

Country Link
EP (1) EP0388851B1 (de)
KR (1) KR940007339B1 (de)
DE (1) DE69016234T2 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0378177B1 (de) * 1989-01-10 1995-08-30 Canon Kabushiki Kaisha Bilderzeugungsgerät
EP0478820B1 (de) * 1990-10-02 1996-01-03 Siemens Nixdorf Informationssysteme Aktiengesellschaft Druck- oder Kopiergerät für ein- oder mehrfarbigen Simplex- und Duplexdruck
JP2634107B2 (ja) * 1991-07-24 1997-07-23 三田工業株式会社 画像形成装置及びその排紙装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4579446A (en) * 1982-07-12 1986-04-01 Canon Kabushiki Kaisha Both-side recording system
US4745439A (en) * 1985-07-02 1988-05-17 Minolta Camera Kabushiki Kaisha Copying apparatus
US4727402A (en) * 1986-12-18 1988-02-23 Xerox Corporation Automatic copier signature set production
EP0378177B1 (de) * 1989-01-10 1995-08-30 Canon Kabushiki Kaisha Bilderzeugungsgerät

Also Published As

Publication number Publication date
EP0388851A3 (de) 1991-05-02
KR940007339B1 (ko) 1994-08-13
DE69016234T2 (de) 1995-06-14
EP0388851A2 (de) 1990-09-26
DE69016234D1 (de) 1995-03-09
KR900014944A (ko) 1990-10-25

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