EP0529294A2 - Zuführvorrichtung für Bogen und Führungsvorrichtung zum Fördern von Bogen - Google Patents

Zuführvorrichtung für Bogen und Führungsvorrichtung zum Fördern von Bogen Download PDF

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Publication number
EP0529294A2
EP0529294A2 EP92112374A EP92112374A EP0529294A2 EP 0529294 A2 EP0529294 A2 EP 0529294A2 EP 92112374 A EP92112374 A EP 92112374A EP 92112374 A EP92112374 A EP 92112374A EP 0529294 A2 EP0529294 A2 EP 0529294A2
Authority
EP
European Patent Office
Prior art keywords
sheet feeding
roller
sheet
pad
plate
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.)
Ceased
Application number
EP92112374A
Other languages
English (en)
French (fr)
Other versions
EP0529294A3 (en
Inventor
Kiyotaka Arai
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 JP3184551A external-priority patent/JP2589010B2/ja
Priority claimed from JP3184549A external-priority patent/JPH0524708A/ja
Application filed by Mita Industrial Co Ltd filed Critical Mita Industrial Co Ltd
Priority to EP95119387A priority Critical patent/EP0709325A3/de
Priority to EP95119386A priority patent/EP0709324A2/de
Publication of EP0529294A2 publication Critical patent/EP0529294A2/de
Publication of EP0529294A3 publication Critical patent/EP0529294A3/en
Ceased legal-status Critical Current

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Classifications

    • 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
    • B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
    • B65H3/52—Friction retainers acting on under or rear side of article being separated
    • B65H3/5207—Non-driven retainers, e.g. movable retainers being moved by the motion of the article
    • B65H3/5215—Non-driven retainers, e.g. movable retainers being moved by the motion of the article the retainers positioned under articles separated from the top of the pile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2601/00—Problem to be solved or advantage achieved
    • B65H2601/20—Avoiding or preventing undesirable effects
    • B65H2601/25—Damages to handled material

Definitions

  • the present invention relates to a mechanism for feeding sheets and a sheet guiding equipment for conveying sheets in ,for example , an image forming apparatus.
  • an image forming apparatus is provided with a sheet feeding cassette 500 for storing sheets, a pick up roller 220 for feeding the sheet from the sheet feeding cassette 500, and a guide plate 230 for guiding the sheet having been fed by the pick up roller 220.
  • a sheet feeding roller 100 On the upper central side of the guide plate 230 is provided a sheet feeding roller 100; on the lower central side of the guide plate 230 is provided a pad mounting plate 130; and a friction pad roller 800 mounted to the pad mounting plate 130 is urged by a spring 200 being urging means so as to abut on the sheet feeding roller 100.
  • a pair of conveying rollers 240 and a pair of resist rollers 250 are provided downstream from the guide plate 230 to feed the sheet to a photo-sensitive drum 210.
  • the friction pad roller 800 abutting on the sheet feeding roller 100 moves downward by a thickness of the sheet against an urging force of the spring 200, the sheet is held between the sheet feeding roller 100 and the friction pad roller 800, and the sheet feeding roller 100 rotates in the arrow direction, thereby conveying the sheet to the downstream side.
  • the pick up roller 220 feeds a plurality of sheets toward the sheet feeding roller 100, though those sheets are held between the sheet feeding roller 100 and the friction pad roller 800, only the upper-most sheet is conveyed to the downstream side, so that the friction pad roller 800 prevents the multiple-feeding of the lower sheets by the friction force thereof.
  • the friction pad roller 800 in such sheet feeding mechanism cannot prevent the multiple feeding if the part thereof abutting on the sheet feeding roller 100 moves in the sheet feeding direction, so that the friction pad roller 800 must be fixed to a bracket 130 so as not to be rotated, or should have a special mechanism for preventing the multiple feeding where it can be rotated, or operated in a manner to be rotated and fixed each time it feeds the sheet.
  • a copying machine of prior art having a sheet feeding mechanism by which a plurality of sheet feeding cassettes are generally provided with a first conveying passage for feeding a sheet from one sheet feeding cassette thereof and a second conveying passage for feeding a sheet from the other sheet feeding cassettes, and further a third conveying passage which extends from the point where the first and the second conveying passages join toward a pair of conveying rollers to convey the sheet conveyed from the the first conveying passage and that from the second conveying passage to the pair of conveying rollers provided upstream.
  • the sheet is conveyed by a sheet feeding roller for that sheet feeding cassette through the first conveying passage to the third conveying passage and fed to the pair of conveying rollers
  • a sheet of the sheet feeding cassette on the second conveying passage side is selected, the sheet is conveyed by a sheet feeding roller for that sheet feeding cassette through the second conveying passage to the third conveying passage and fed to the pair of conveying rollers.
  • the sheet feeding direction may change at a sharp angle, or the leading edge of the sheet conveyed through the second conveying passage may hit an inner wall of the third conveying passage to force its direction to be changed, in which case a forth problem develops that the sheet bends and jams in the third conveying passage without being fed smoothly to the pair of conveying rollers.
  • a sheet feeding shaft 300 being a rotating shaft of the sheet feeding roller 100 is pivotably supported at the central part thereof by a vertically folded end 350 of a supporting member 340, and at the right end thereof on the drawing by a body frame 390.
  • the left end of the sheet feeding shaft 300 is free, from which the sheet feeding roller 100 is easily detachable.
  • the supporting member 340 is joined at the end 360 vertically folded on the body frame side 390 side to the body frame side 390, and at a central plate 330 to a guide plate 320.
  • the guide plate 320 is omitted in Fig. 2 (b).
  • the present invention is made to solve the above first problem of the sheet feeding mechanism of prior art and it is an object of the present invention to provide a sheet feeding mechanism with which sheets are not wrinkled or torn when a sheet feeding cassette thereof is pulled out.
  • a sheet feeding mechanism of the present invention comprises; a sheet feeding roller for feeding sheets, an advance preventive member which is abuttable on the sheet feeding roller by a use of urging means and is for preventing multiple feeding of sheets, and the advance preventive member having a first acted part, and while a sheet feeding cassette is on operation of being pulled out, a first acting part provided to the sheet feeding cassette acting on the first acted part of the advance preventive member, thereby the advance preventive member being separated from the sheet feeding roller against an urging force of the urging means.
  • a rail provided to the sheet feeding cassette abuts on a protrusion of the advance preventive member to allow the protrusion to be moved against the urging force of urging means, whereby an arm formed integrally with the protrusion is pivoted to allow a pad to be separated from the sheet feeding roller, and the sheets held between the sheet feeding roller and the pad to be released.
  • the present invention is also made to solve the above second problem of the sheet feeding mechanism of prior art and it is an object of the present invention to provide a sheet feeding mechanism with which the life of the friction pad becomes longer, and the equipment is simple and requires no special operation.
  • a sheet feeding mechanism of the present invention comprises; a sheet feeding roller for feeding sheets , an advance preventive member which is abuttable on the sheet feeding roller by use of urging means and for preventing multiple feeding of sheets, a multiple feeding preventive roller of the advance preventive member being rotatable only in a direction reverse to sheet feeding direction, the advance preventive member having an acted part, and where a sheet feeding cassette is pulled out/set, an acting part provided to the sheet feeding cassette acts directly or indirectly on the acted part of the advance preventive member, thereby the multiple feeding preventive roller being separated from the sheet feeding roller against an urging force of the urging means.
  • an acting part provided to the sheet feeding cassette acts on an acted part of an advance preventive member to cause a multiple feeding preventive roller of the advance preventive member to be separated from a sheet feeding roller, and a vibration at the time of setting/pulling out of the sheet feeding cassette is transmitted to the multiple feeding preventive roller to allow the multiple feeding preventive roller becoming free from the sheet feeding roller to be rotated random in the direction reverse to the sheet feeding direction, thereby changing the abutting part of the multiple feeding preventive roller.
  • the present invention is also made to solve the above third problem of the multiple feeding preventive equipment of prior art and it is an object of the present invention to provide a multiple feeding preventive equipment with which before and after the replacement of a friction pad roller, the urging force of a spring does not change not to allow a poor sheet feeding to occur.
  • a sheet feeding mechanism of the present invention comprises; a guide plate for guiding sheets, a side plate which has an opening and is connected downward to an end on a downstream side of the guide plate, a supporting member mounted to an underside of the guide plate, a pad supporting plate connected pivotably under the guide plate to the supporting member, pad means mounted removably to the guide plate side of the pad supporting plate for preventing multiple feeding, and urging means provided between the other part of the pad supporting plate and a part lower than the opening of the side plate in order to allow a pad of the pad means to abut on the sheet feeding roller by it's urging force.
  • the pad means when pad means is replaced, utilizing an opening provided to a side plate, the pad means is removed from a pad supporting plate and new pad means is mounted to the pad supporting plate, and at this point, before and after the replacement of the pad means, urging means is not removed, so that the urging force thereof does not change.
  • the present invention is also made to solve the above forth problem of the sheet guide equipment of prior art and it is an object of the present invention to provide a sheet guide equipment which is simple in composition and inexpensive, and can convey smoothly sheets.
  • a sheet guide equipment of the present invention comprises; a first conveying passage, a second conveying passage, a third conveying passage formed as one passage by joining of the first conveying passage with the second conveying passage, and thin plate-like guide means which extends from a joining point of the first conveying passage with the second conveying passage in a conveying direction and which abuts on an inner wall of the third conveying passage, or a part of which is positioned near the inner wall, and the guide means being such that a part A having a specified length from a head is more bendable than the remaining part B.
  • the sheet passing through the first conveying passage hits a hardly bendable part B of guide means, changes certainly in the conveying direction, and is guided by the surface of the guide means and fed through a third conveying passage to a pair of conveying rollers ; while with a sheet of another sheet feeding cassette fed to a second conveying passage, the sheet passing through the second conveying passage is guided in a gap between the inner wall of the third conveying passage on which the head of the guide means abuts or near which part of the guide means is positioned and an easily bendable part A of the guide means, and pushes down smoothly the head of the guide means, thereby being fed downstream.
  • the present invention is also made to solve the above fifth problem of the sheet feeding roller holding mechanism of prior art and it is an object of the present invention to provide a sheet feeding mechanism which inhibits a vibration of a guide plate in itself and eliminates an abnormal sound.
  • a sheet feeding mechanism of the present invention comprises: a sheet feeding roller for feeding sheets, a sheet feeding shaft at one end of which the sheet feeding roller is detachably mounted, a body frame for holding the other end of the sheet feeding shaft, a supporting member for supporting the sheet feeding shaft at the other end of the sheet feeding roller, a plate part mounted to the body frame for supporting the supporting member, and a vibration preventive member which is supported by the body frame and a part of which abuts on a specified position of the plate part, the supporting member or the sheet feeding shaft in a manner to prevent a deformation to which they are subjected.
  • a body frame supports a vibration preventive member, and part of the vibration preventive member abuts on a specified position of a plate, a supporting member, or a sheet feeding shaft in a manner to prevent a deformation to which they are subjected, whereby the vibration of the plate, the supporting member, or the sheet feeding shaft is prevented to cause the abnormal sound to be eliminated.
  • Fig. 1 is a schematic side view showing enlarged principal parts of a sheet feeding mechanism of prior art.
  • Fig. 2 is a view showing a holding mechanism of the sheet feeding roller of prior art.
  • Fig. 3 is a side view showing an embodiment of a sheet feeding mechanism according to the present invention.
  • Fig. 4 is a side view showing a state of an embodiment mainly indicating an advance preventive member of the sheet feeding mechanism according to the present invention.
  • Fig. 5 is a side view showing another state of the embodiment mainly indicating the advance preventive member of the sheet feeding mechanism according to the present invention.
  • Fig. 6 is a front view to help explanation of the movement of the advance preventive member associated with the movement of the sheet feeding mechanism according to the present invention.
  • Fig. 7 is a front view to help explanation of the movement of the advance preventive member associated with the movement of the sheet feeding mechanism according to the present invention.
  • Fig. 8 is a member view showing the internal structure of a friction pad roller of the advance preventive member of the sheet feeding mechanism according to the present invention.
  • Fig. 9 is a front view to help explanation of the movement of the advance preventive member associated with the movement of the sheet feeding mechanism according to the present invention.
  • Fig. 10 is a front view to help explanation of the movement of the advance preventive member associated with the movement of the sheet feeding mechanism according to the present invention.
  • Fig. 11 is a side view showing a state of an embodiment mainly indicating an advance preventive member of the sheet feeding mechanism according to the present invention.
  • Fig. 12 is a side view showing another state of the embodiment mainly indicating the advance preventive member of the sheet feeding mechanism according to the present invention.
  • Fig. 13 is a side view showing another state of the embodiment mainly indicating the advance preventive member of the sheet feeding mechanism according to the present invention.
  • Fig. 14 is a side view showing another state of the embodiment mainly indicating the advance preventive member of the sheet feeding mechanism according to the present invention.
  • Fig. 15 is a side view showing the embodiment mainly indicating a conveying passage joining part of the sheet feeding mechanism according to the present invention.
  • Fig. 16 is a front view of guide means provided in conveying passages of the sheet feeding mechanism according to the present invention.
  • Fig. 17 is a side view of various guide means provided in conveying passages of the sheet feeding mechanism according to the present invention.
  • Fig. 18 is a partially sectional view showing the holding mechanism of a sheet feeding roller of a sheet feeding mechanism according to the present invention.
  • Fig. 3 is a side view of part of an image forming apparatus including a sheet feeding mechanism of an embodiment according to the first present invention. That is, the image forming apparatus is provide with a sheet feeding cassette 5 for storing a sheet, a pick up roller 22 for feeding the sheet from the sheet feeding cassette 5, and a guide plate 23 for guiding the sheet having been fed by the pick up roller 22. On the upper central side of the guide plate 23 is provided a sheet feeding roller 1, and on the lower central side of the guide plate 23 is mounted an advance preventive member 3 for preventing multiple sheet feeding in a manner to be abuttable on the sheet feeding roller 1 by a spring 2 being urging means.
  • a pair of conveying rollers 24 and a pair of resist rollers 25 are provided on the side further downstream from the guide plate 23 in order to feed the sheet to a photo-sensitive drum 21.
  • the above-described advance preventive member 3 is formed with a supporting member 9 fixed to the guide plate 23, an arm 7 supported pivotably by the supporting member 9, a friction pad roller 8 which is mounted at one end of the arm 7 and is a pad abuttable on the the sheet feeding roller 1, and a protrusion 4 which is an acted part mounted on the sheet feeding cassette 5 side of the arm 7.
  • a spring 2 being urging means for allowing the friction pad roller 8 to abut on the sheet feeding roller 1 by the urging force thereof, and to the lower end of the guide plate 23 is connected the other end of the spring 2.
  • Fig. 6 is a view showing a relationship in position between the sheet feeding cassette 5 and the protrusion 4 of the advance preventive member 3 as viewed in the X direction of Fig. 3. That is, on the side face on the advance preventive member 3 side of the sheet feeding cassette 5 is provided a rail 6 which acts as an acting part that is formed with downward inclined faces A, B on the both sides and with a face C horizontal in the moving direction on the central part. In Fig. 6, the sheet feeding cassette 5 is allowed to move leftward when pulled out, and rightward when set.
  • the sheet feeding cassette 5 When the sheet feeding cassette 5 is used , as shown in Fig.4 , the sheet is fed by the pick up roller 22 to the guide plate 23.
  • the sheet feeding roller 1 rotates in the arrow direction, whereby the sheet is held between the sheet feeding roller 1 and the friction pad roller 8, and conveyed toward the pair of conveying rollers 24.
  • the pick up roller 22 has fed a plurality of sheets, those sheets are held between the sheet feeding roller 1 and the friction pad roller in a similar manner to for one sheet.
  • the friction pad roller 8 not rotating has a friction force larger than that between sheets, which causes the lower side sheets to remain as they are, whereby the sheet feeding roller 1 conveys only the uppermost sheet.
  • the rotation of the sheet feeding roller 1 stops, and the remaining sheets not conveyed are left held between the sheet feeding roller 1 and the friction pad roller 8.
  • the sheets held between the sheet feeding roller 1 and the friction pad roller 8 are first conveyed, while where there is no sheets and then sheets should be supplied to the sheet feeding cassette 5 , the sheet feeding cassette 5 must be pulled out in a condition that the sheets remain.
  • Fig. 7 shows a sheet feeding mechanism of another embodiment.
  • the sheet feeding cassette 5 is pulled up or set leftward/rightward on the drawing.
  • a protrusion 12 On the underside of the sheet feeding cassette 5 moving in the arrow direction when set/pulled out is provided a protrusion 12 having a horizontal part C long in the moving direction and inclined faces A, B at the both end thereof. On the lower side of the protrusion 12 is provided a lever 11.
  • a pivoting shaft 14 On the central part of the lever 11 is provided a pivoting shaft 14, and at one end on the left side on the drawing is provided an abutting protrusion 13 in a manner to be close to the inclined face A of the protrusion 12.
  • a guide groove 30 into which a movable shaft 31 is fitted, and the shaft 31 is mounted at one end of an arm 10.
  • the arm 10 is pivotably supported by a supporting member 15.
  • To the shaft 31 side of the arm 10 is connected the spring 2, and at the other end is mounted the friction pad roller 8 which abuts on the sheet feeding roller 1 by the urging force of the spring 2.
  • the other end of the spring 2 is connected to one end of the guide plate 23, to which the above-described supporting member 15 is mounted.
  • the abutting protrusion 13 abuts on the horizontal part C of the protrusion 12 to keep a condition that the friction pad roller 8 is separated from the sheet feeding roller 1, whereby the sheet is pulled out together with the sheet feeding cassette 5. Then, when the sheet has been pulled out and the sheet feeding cassette 5 is further pulled out, the abutting protrusion 13 is returned to the original position while abutting on the inclined face B of the protrusion 12, and the lever 11 is also returned to the original position, whereby the friction pad roller 8 abuts again on the sheet feeding roller 1.
  • the pad roller is allowed to be separated from the sheet feeding roller by pivoting the arm, in addition to such method, the pad roller may be moved upward/downward in the guide groove provided to the supporting member as in prior art, and the rail may be allowed to move a protrusion provided on the pad roller itself.
  • an electrical method may be utilized in which, for example, a micro-switch is mounted to an acted part of the advance preventive member and a protrusion is formed at a position of the sheet feeding cassette close to the micro-switch in a condition that the sheet feeding cassette is set to the sheet feeding cassette position, whereby when the sheet feeding cassette is pulled out, the protrusion pushes the micro-switch to cause a solenoid mounted to the guide plate to pull the acted part of the advance preventive member for a specified time, and thus to allow the pad roller to pivot in a manner to be separated from the sheet feeding roller.
  • the present invention has an advantage that when sheet feeding cassette is pulled out, the sheet remaining at the pick up roller is not wrinkled and torn.
  • the sheet feeding mechanism of an embodiment according to the second present invention will be explained hereinafter.
  • the embodiment is almost similar to the embodiment of the first invention but the friction pad roller 8, and the guide means 6 and so on are different.
  • Fig. 8 is a sectional view of the friction pad roller 8 of the advance preventive member 3 in Fig. 3.
  • the friction pad roller 8 is formed by mounting a pad 82 allowed to abut on the sheet feeding roller 1 on the surface of a collar 81 provided with a one-way clutch 83 having a mechanism rotatable only in one direction, and mounted at one end of the arm 7 in a manner to be rotatable reversely to the sheet feeding direction (rotatable only in the dotted-line arrow direction of Fig. 3).
  • Fig. 9 is a view showing a relationship in position between the sheet feeding cassette 5 and the protrusion 4 of the advance preventive member 3 as viewed in the X direction of Fig. 3.
  • the sheet feeding cassette 5 is allowed to move leftward when pulled out, and rightward when set.
  • the sheet feeding cassette 5 When the sheet feeding cassette 5 is used (Fig. 4), the sheet is fed by the pick up roller 22 to the guide plate 23.
  • the sheet feeding roller 1 rotates in the arrow direction, whereby the sheet is held between the sheet feeding roller 1 and the friction pad roller 8, and conveyed toward the pair of conveying rollers 24.
  • the friction pad roller 8 is fixed without being rotated in the sheet feeding direction because of the one-way clutch 83, so that the friction force causes the lower side sheets to remain as they are, whereby the sheet feeding roller 1 conveys only the uppermost sheet, thus preventing the multiple sheet feeding.
  • the abutting part of the friction pad roller 8, on which the sheet feeding roller 1 abuts wears at the same part at all times without moving.
  • the abutting position of the guide means 6 on the protrusion 4 shifts from the triangle wave face C to the inclined face B of the guide means 6, and thus the inclined face B abuts on the inclined corner face E of the protrusion 4.
  • the protrusion 4 is returned to the lower side, the inclined corner face E of the protrusion 4 is separated from the inclined face B, and thus the guide means 6 for pushing up the protrusion 4 is separated, whereby the protrusion 4 is returned to the original position by the spring 2 to cause the friction pad roller 8 to abut on the sheet feeding roller 1 (refer to Fig. 4).
  • the friction pad roller 8 had already been rotated a little, so that the abutting part of the pad 82 has shifted to another position.
  • the protrusion 4 moves upward/downward in a similar manner to for the above-described pulling out, while the friction pad roller 8 is separated from the sheet feeding roller 1, thereby giving a vibration to the friction pad roller 8 to change the abutting position of the pad 82.
  • the protrusion provided to the arm is allowed to be acted directly by the guide means
  • the protrusion may be allowed to be acted in directly through an intermediate lever by providing the guide means in another position of the sheet feeding cassette.
  • the guide means has a shape of triangle wave face, in addition to such shape, a wave face as shown in Fig.10 (a), or a plurality of protrusions on the upper side of the horizontal face as shown in Fig. 10 (b) may be provided.
  • a flat face may be provided, in which case a little vibration due to the pulling out/setting of the sheet feeding cassette occurs and is transmitted to the pad to allow a little rotation.
  • the present invention has an advantage that the life of the friction pad roller becomes longer, and the equipment is simple in structure and requires no special operation.
  • Fig. 3 is a member view of part of an image forming apparatus provided with a multiple feeding preventive equipment of an embodiment according to the third present invention. That is, the image forming apparatus is provide with a sheet feeding cassette 5 for storing a sheet, a pick up roller 22 for feeding the sheet from the sheet feeding cassette 5, and a guide plate 23 for guiding the sheet having been fed by the pick up roller 22. On the upper central side of the guide plate 23 is provided a sheet feeding roller 1, and on the lower central side of the guide plate 23 is mounted an advance preventive member 3 for preventing multiple sheet feeding in a manner to be abuttable on the sheet feeding roller 1 by a spring 2 being urging means.
  • a side plate 111 provided with an opening 110 for maintenance and checking is connected downward to the end on the downstream side of the guide plate 23.
  • a cover plate 112 with a jaw 113 (refer to Fig. 4) and machine screws 114 is mounted to the opening 110.
  • a pair of conveying rollers 24 and a pair of resist rollers 25 are provided on the side further downstream from the guide plate 23 in order to feed the sheet to a photo sensitive drum 21.
  • the above-described friction pad roller 8 is mounted to an L-shaped pad mounting plate 115 to constitute a pad means 12 of the advance preventive means 3.
  • the pad mounting plate 115 is fixed with a machine screw 16 to a bottom plate of a U sectional-shaped pad supporting plate 7, which is pivotably supported by the supporting member 9 provided to the guide plate 23.
  • To the lower end of the pad supporting plate 7 is connected one end of the spring 2 being urging means for allowing the friction pad roller 8 to abut on the sheet feeding roller 1 by the urging force thereof, and to the lower end of the side plate 111 is connected the other end of the spring 2.
  • the roller 8 When the friction pad roller 8 wears due to a long-term usage, the roller must be replaced with a new one. At this point, the power source of the image forming apparatus is first to be opened, and a side door 116 shown in Fig. 3 to be opened.
  • Opening the side door 116 allows the cover plate 112 blocking the opening 110 of the side plate 111 to be found. Then, as shown in Fig.4 the both side machine screws 114 mounting the cover plate 112 is to be loosened and removed. After removing the machine screws 114, the cover plate 112 is to be removed in such a manner that as shown in Fig. 11, the cover plate 112 is to be raised a little so as to pull out a jaw 113 hooking at the lower end edge of the opening 110. When the cover plate 112 is removed, the opening 110 is opened to allow the inner friction pad roller 8 and the pad supporting plate 7 to be found.
  • a new friction pad roller 8 mounted to the pad mounting plate 115 is to be inserted from the opening 110 and fastened and fixed with the machine screw 16 to the pad supporting plate 7 in a similar manner to the above.
  • the jaw 113 on the lower side of the cover plate 112 is hooked at the lower end edge of the opening 110, and the upper side of the cover plate 112 is fastened and fixed with the machine screws 114.
  • Figs. 13 and 14 show another embodiment.
  • the opening 110 is provided to the side plate 111 similarly to the above-described embodiment.
  • a shaft 810 is fitted into a U-shaped dent 131 of the pad mounting plate 115, which is fixed to the pad supporting plate 7.
  • a worn friction pad roller 8 is to be replaced in a similar manner to the above by opening a side cover 116, removing the cover plate 112 from the side plate 111, opening the opening 110, pushing the lower side of the pad supporting plate 7 to the inner side to pivot the pad supporting plate 7 through the opening 110 by a hand , separating the friction pad roller 8 from the sheet feeding roller 1, and pulling out a friction pad roller shaft 810 to a near side while shifting out from the dent 113 (refer to Fig. 14).
  • a machine screw is used for fixing the pad mounting plate
  • a quick fitting construction such as a hooking jaw and a holding fixture may be used if they provide a certainly positive fixing.
  • the present invention has an advantage that before and after the replacement of the friction pad roller, the urging force of the spring does not change to cause a poor sheet feeding no to occur.
  • the sheet feeding cassette 5 storing sheets for a first conveying passage 600.
  • the pick up roller 22 on the downstream side of which is provided the guide plate 23 for guiding sheets, in the midway of which is provided the sheet feeding roller 1 for conveying the sheets on the upper side, and the friction pad roller 8 for preventing the multiple sheet feeding on the lower side.
  • On the guide plate 23 is provided an inclined face 601 for guiding the sheets to the downstream side of the friction pad roller 8, and the passage from the sheet feeding roller 1 to the inclined face 601 forms the first conveying passage 600.
  • guide means 603. The tip head 604 is provided in a manner to abut on the inner wall on the upper side of a third conveying passage 605.
  • the sheet feeding cassette 5 On the lower side of the sheet feeding cassette 5 are provided another sheet feeding cassette, pick up roller(which are not shown), guide plate , sheet feeding roller 401, and friction pad roller 430 in a similar manner to the above, and on a downstream side of the guide plate is provided a conveying roller 607 for conveying sheets to a second conveying passage 606.
  • the second conveying passage 606 joins with the above-described first conveying passage 600 to form the third conveying passage 605.
  • Fig. 16 is a plan view of the guide means 603 of the above-described embodiment.
  • a plurality of slits 610 having a specified length from the head 604 thereof, while the part B is left as it is.
  • the pick up roller 22 feeds the sheet stored in the sheet feeding cassette 5 toward the sheet feeding roller 1.
  • the fed sheet is fed along the face of the guide plate 23 by the sheet feeding roller 1 rotating in the arrow direction to the first conveying passage 600.
  • the sheets on the lower side are not conveyed due to the friction force of the friction pad roller 8 on the lower side, and only the uppermost one sheet abutting on the sheet feeding roller 1 is fed .
  • the sheet having been fed by a sheet feeding roller 401 in a similar manner to the above is fed to the conveying roller 607 in Fig. 3 ,by which the sheet is fed to the second conveying passage 606.
  • the leading edge of the sheet 611 having been fed to the second conveying passage 606 hits an inner wall 607 formed on the curved face of the third conveying passage 605, and is bent along the curved face .
  • the sheet is conveyed along into a gap which becomes gradually narrow and is formed between the inner wall 607 and the guide means 603.
  • the part A including the head 604 of the guide means 603 which is formed in a manner to be more flexible than the part B is pushed downward by the conveying force of the sheet 611, whereby the sheet 611 passes along the inner wall 607 and smoothly between the inner wall 607 and the head 604 of the guide means 603, and is conveyed toward the pair of conveying rollers 24.
  • the guide means 603 utilizes the easily deflectable(bendable) properties of the part A and the hardly deflectable properties of the remaining part B (though having resilient properties) to allow the sheet 611 to be fed smoothly to the third conveying passage 605.
  • the guide means are provided with a plurality of slits to change the deflectable properties thereof, in addition to such method, as shown in Fig. 17, the following methods may be used: (a) the thickness of the part A of the guide means 603 is made thinner than the part B; (b) the thickness of the whole guide means 603 is made thin, and the part B made double to exhibit the hardly deflectable properties; (c) the thickness of the guide means 603 is made inclined so that the mounting part of the guide means 603 becomes thick and the head 604 thin; or (d) the material of the part A of the guide means 603 is made more deflectable than that of the part B.
  • the part A of the guide means 603 abuts on the inner wall
  • the part A may be positioned near the inner wall without being in contact with the wall.
  • the present invention includes guide means in which the part A having a specified length from the head is more deflectable than the part B, and thus has an advantage that the equipment is simple in structure, inexpensive and can convey smoothly sheets.
  • Fig. 18 is a schematic sectional view taken in the direction A of Fig. 3. That is, to a rear frame 431 and a front frame 432 of a body frame 420 are fixed with machine screws the both ends of a slender plate-like stay 461 and those of a guide plate 405 being a plate part. Between the central part of the stay 461 and the guide plate 405 therebelow is held an elastic member 407 made of rubber. The stay 461 and the elastic member 407 form a vibration preventive member 406. On the surface of the guide plate 405 opposite to the side on which the elastic member 407 abuts is mounted a supporting member 404 with a machine screw and the like. The supporting member 404 is bent vertically at the both ends thereof and thus has a fixed part 441 and a receiving part 440.
  • the fixed part 441 of the supporting member 404 is fixed to the rear frame 431 by means of welding and the like, and the receiving part 440 is provided with a bearing 434.
  • a sheet feeding shaft 402 is rotatably supported.
  • the left end of the sheet feeding shaft 402 is extended from the bearing 434 toward the front frame 432, and a sheet feeding roller 401 is installed to the extended end of the sheet feeding shaft 402, which is fixed with a stop ring 411 so that the roller 401 does not slip out.
  • Under the sheet feeding roller 401 is arranged a friction pad roller 430 for preventing the multiple feeding of copying sheets (refer to Fig.3).
  • the copying sheet is conveyed upperstream while being held between the sheet feeding roller 401 and the friction pad roller 430.
  • the friction pad roller 430 prevents multiple feeding, whereby only the uppermost copying sheet on the sheet feeding roller 401 side is conveyed.
  • the sheet feeding roller 401 is supported only at one side by the bearings 433, 434, so that the sheet feeding mechanism constructed to use the friction pad roller 430 is subjected to a large load when conveying copying sheets, and liable to receive the vibration of upward/downward motion.
  • the vibration of the sheet feeding roller 401 is transmitted from the bearing 434 to the supporting member 404, and then to the guide plate 405 to vibrate.
  • the vibration of the guide plate 405 is transmitted to the elastic member 407 abutting on the guide plate 405, while the elastic member 407 supported by the stay 461 mounted to the body frame 403 absorbs the vibration of guide plate 405 by the resiliency thereof and the supporting force of the stay 461, whereby the guide plate 405 inhibits an abnormal sound occurring due to vibration.
  • the elastic member 407 uses rubber, in addition to such material, for example, an elastic material of synthetic resin, metal or spring may be used.
  • the thickness of the elastic member 407 is made equal to the gap formed by the stay 461 and the guide plate 405, the thickness may be made a little larger, for example, 0.2 to 1.0 mm than the gap with the guide plate 405 made deflected a little downward so that vibration further hardly occur.
  • the shape of the elastic member may be made thick at the central part thereof.
  • the vibration preventive member 406 is allowed to abut on the plate 405, the member may be allowed to abut on the supporting member to inhibit the vibration.
  • the vibration preventive member 406 is allowed to abut on the plate 405 from the upper side of the sheet feeding roller 401
  • the member may be allowed to abut on the part from the lower side of the sheet feeding roller 401.
  • the member may be allowed to abut on the supporting member 404 instead of the plate 405.
  • the elastic member 407 of the vibration preventive member 406 is allowed to abut on the plate 405
  • the elastic member 407 may be formed between the vibration preventive member 406 and the frame mounting part, or by forming the abutting part with a non-elastic material , and by positioning the elastic member held between the abutting part and the vibration preventive member ,the vibration can be inhibited.
  • the present invention has an advantage that them mechanism is supported by the body frame, and the part there of abuts on a specified position of the plate part, the supporting member or the sheet feeding shaft in a manner to prevent a deformation they are subject to, thereby inhibiting the vibration of the guide plate in itself to eliminate an abnormal sound.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
EP19920112374 1991-07-24 1992-07-20 Sheet feeding mechanism for feeding sheets and sheet guiding equipment for conveying sheets Ceased EP0529294A3 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP95119387A EP0709325A3 (de) 1991-07-24 1992-07-20 Bogenzuführvorrichtung und Bogenleitvorrichtung zum Fördern von Bogen
EP95119386A EP0709324A2 (de) 1991-07-24 1992-07-20 Bogenzuführvorrichtung und Bogenleitvorrichtung zum Fördern von Bogen

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP184549/91 1991-07-24
JP3184551A JP2589010B2 (ja) 1991-07-24 1991-07-24 給紙機構
JP184551/91 1991-07-24
JP3184549A JPH0524708A (ja) 1991-07-24 1991-07-24 用紙ガイド装置

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP95119387.9 Division-Into 1992-07-20
EP95119386.1 Division-Into 1992-07-20

Publications (2)

Publication Number Publication Date
EP0529294A2 true EP0529294A2 (de) 1993-03-03
EP0529294A3 EP0529294A3 (en) 1993-06-23

Family

ID=26502559

Family Applications (3)

Application Number Title Priority Date Filing Date
EP95119386A Withdrawn EP0709324A2 (de) 1991-07-24 1992-07-20 Bogenzuführvorrichtung und Bogenleitvorrichtung zum Fördern von Bogen
EP19920112374 Ceased EP0529294A3 (en) 1991-07-24 1992-07-20 Sheet feeding mechanism for feeding sheets and sheet guiding equipment for conveying sheets
EP95119387A Withdrawn EP0709325A3 (de) 1991-07-24 1992-07-20 Bogenzuführvorrichtung und Bogenleitvorrichtung zum Fördern von Bogen

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP95119386A Withdrawn EP0709324A2 (de) 1991-07-24 1992-07-20 Bogenzuführvorrichtung und Bogenleitvorrichtung zum Fördern von Bogen

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP95119387A Withdrawn EP0709325A3 (de) 1991-07-24 1992-07-20 Bogenzuführvorrichtung und Bogenleitvorrichtung zum Fördern von Bogen

Country Status (1)

Country Link
EP (3) EP0709324A2 (de)

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5657077A (en) * 1979-10-15 1981-05-19 Canon Inc Vibration generating method in image forming apparatus
JPS56154758A (en) * 1980-04-30 1981-11-30 Konishiroku Photo Ind Co Ltd Copying machine having sorter
JPS57117437A (en) * 1981-01-13 1982-07-21 Toshiba Corp Sheet guide device
DE3221261A1 (de) * 1981-06-09 1983-01-05 Konishiroku Photo Industry Co., Ltd., Tokyo Papiertransportmechanismus
JPS5836841A (ja) * 1981-08-29 1983-03-03 Konishiroku Photo Ind Co Ltd 給紙通路装置
JPS58197142A (ja) * 1982-05-12 1983-11-16 Fuji Xerox Co Ltd ロ−ル紙給紙装置
JPS6049350A (ja) * 1983-08-29 1985-03-18 Fuji Xerox Co Ltd 複写機のロ−ル紙切断装置
JPS6097142A (ja) * 1983-11-02 1985-05-30 Fuji Xerox Co Ltd 複写機等の給紙装置
JPS60122643A (ja) * 1983-12-05 1985-07-01 Canon Inc 給紙装置
JPS6190943A (ja) * 1984-10-08 1986-05-09 Olympus Optical Co Ltd 給紙装置
JPS61197338A (ja) * 1985-02-27 1986-09-01 Hitachi Ltd 給紙装置
JPS61273444A (ja) * 1985-05-24 1986-12-03 Hitachi Koki Co Ltd 用紙送り出し装置
JPS6217847A (ja) * 1985-07-16 1987-01-26 Fujitsu Ltd パリテイ生成スキヤンイン方式
JPS63165228A (ja) * 1986-12-25 1988-07-08 Toshiba Corp 給紙装置
EP0281073A2 (de) * 1987-03-02 1988-09-07 Mita Industrial Co. Ltd. Reibungsandrückbefestigung

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5657077A (en) * 1979-10-15 1981-05-19 Canon Inc Vibration generating method in image forming apparatus
JPS56154758A (en) * 1980-04-30 1981-11-30 Konishiroku Photo Ind Co Ltd Copying machine having sorter
JPS57117437A (en) * 1981-01-13 1982-07-21 Toshiba Corp Sheet guide device
DE3221261A1 (de) * 1981-06-09 1983-01-05 Konishiroku Photo Industry Co., Ltd., Tokyo Papiertransportmechanismus
JPS5836841A (ja) * 1981-08-29 1983-03-03 Konishiroku Photo Ind Co Ltd 給紙通路装置
JPS58197142A (ja) * 1982-05-12 1983-11-16 Fuji Xerox Co Ltd ロ−ル紙給紙装置
JPS6049350A (ja) * 1983-08-29 1985-03-18 Fuji Xerox Co Ltd 複写機のロ−ル紙切断装置
JPS6097142A (ja) * 1983-11-02 1985-05-30 Fuji Xerox Co Ltd 複写機等の給紙装置
JPS60122643A (ja) * 1983-12-05 1985-07-01 Canon Inc 給紙装置
JPS6190943A (ja) * 1984-10-08 1986-05-09 Olympus Optical Co Ltd 給紙装置
JPS61197338A (ja) * 1985-02-27 1986-09-01 Hitachi Ltd 給紙装置
JPS61273444A (ja) * 1985-05-24 1986-12-03 Hitachi Koki Co Ltd 用紙送り出し装置
JPS6217847A (ja) * 1985-07-16 1987-01-26 Fujitsu Ltd パリテイ生成スキヤンイン方式
JPS63165228A (ja) * 1986-12-25 1988-07-08 Toshiba Corp 給紙装置
EP0281073A2 (de) * 1987-03-02 1988-09-07 Mita Industrial Co. Ltd. Reibungsandrückbefestigung

Non-Patent Citations (13)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 005, no. 115 (P-072)24 July 1981 & JP-A-56 057 077 (CANON INC) 19 May 1981 *
PATENT ABSTRACTS OF JAPAN vol. 006, no. 038 (P-105)9 March 1982 & JP-A-56 154 758 (KONISHIROKU PHOTO IND CO LTD) 30 November 1981 *
PATENT ABSTRACTS OF JAPAN vol. 006, no. 210 (M-166)22 October 1982 & JP-A-57 117 437 (TOKYO SHIBAURA DENKI) 21 July 1982 *
PATENT ABSTRACTS OF JAPAN vol. 007, no. 116 (M-216)20 May 1983 & JP-A-58 036 841 (KONISHIROKU SHASHIN KOGYO) 3 March 1983 *
PATENT ABSTRACTS OF JAPAN vol. 009, no. 174 (P-374)19 July 1985 & JP-A-60 049 350 (FUJI XEROX KK) 18 March 1985 *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 267 (M-516)11 September 1986 & JP-A-61 090 943 (OLYMPUS OPTICAL CO LTD) 9 May 1986 *
PATENT ABSTRACTS OF JAPAN vol. 011, no. 025 (M-556)23 January 1987 & JP-A-61 197 338 (HITACHI LTD) 1 September 1986 *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 432 (M-763)15 November 1988 & JP-A-63 165 228 (TOSHIBA CORP) 8 July 1988 *
PATENT ABSTRACTS OF JAPAN vol. 11, no. 131 (M-584)(2578) 24 April 1987 & JP-A-61 273 444 (HITACHI KOKI CO LTD) 3 December 1986 *
PATENT ABSTRACTS OF JAPAN vol. 12, no. 10 (M-658)(2857) 13 January 1988 & JP-A-62 17 847 (KONISHIROKU PHOTO IND CO LTD) 28 July 1987 *
PATENT ABSTRACTS OF JAPAN vol. 8, no. 40 (M-278)(1477) 21 February 1984 & JP-A-58 197 142 (FUJI XEROX) 16 November 1983 *
PATENT ABSTRACTS OF JAPAN vol. 9, no. 245 (M-418)(1968) 2 October 1985 & JP-A-60 97 142 (FUJI XEROX) 30 May 1985 *
PATENT ABSTRACTS OF JAPAN vol. 9, no. 279 (M-427)(2002) 7 November 1985 & JP-A-60 122 643 (CANON K.K.) 1 July 1985 *

Also Published As

Publication number Publication date
EP0709324A3 (de) 1996-06-05
EP0709324A2 (de) 1996-05-01
EP0529294A3 (en) 1993-06-23
EP0709325A2 (de) 1996-05-01
EP0709325A3 (de) 1996-06-26

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