EP0725024A1 - Dispositif d'alimentation de feuille comportant un élément de paliers mobile qui aide au guidage de feuilles le long d'un trajet de transfert et qui est influencé par un élément de poussé - Google Patents

Dispositif d'alimentation de feuille comportant un élément de paliers mobile qui aide au guidage de feuilles le long d'un trajet de transfert et qui est influencé par un élément de poussé Download PDF

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Publication number
EP0725024A1
EP0725024A1 EP96400214A EP96400214A EP0725024A1 EP 0725024 A1 EP0725024 A1 EP 0725024A1 EP 96400214 A EP96400214 A EP 96400214A EP 96400214 A EP96400214 A EP 96400214A EP 0725024 A1 EP0725024 A1 EP 0725024A1
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EP
European Patent Office
Prior art keywords
sheet
roller
feeding device
path
drive
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.)
Granted
Application number
EP96400214A
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German (de)
English (en)
Other versions
EP0725024B1 (fr
Inventor
Noburo Nakatani
Alexandre Dodge
Christophe Truffaut
Marie-Hélène Froger
Stéphane Michel
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
Application filed by Canon Inc filed Critical Canon Inc
Publication of EP0725024A1 publication Critical patent/EP0725024A1/fr
Application granted granted Critical
Publication of EP0725024B1 publication Critical patent/EP0725024B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B65H3/523—Non-driven retainers, e.g. movable retainers being moved by the motion of the article the retainers positioned over articles separated from the bottom of the pile
    • B65H3/5238—Retainers of the pad-type, e.g. friction pads

Definitions

  • the present invention relates to a sheet feeding device designed to transfer, one by one, sheets forming part of a pile to a device for processing the said sheets.
  • the present invention essentially finds an application in facsimile machines, notably as a device for feeding documents to be sent. It also finds an application as a sheet feeding device for a printing device, whether it be a printer, a photocopier or a facsimile machine. It can, in a general manner, find an application in the field of office automation, and other fields in which it is necessary to transfer one by one the sheets forming part of a pile along a predetermined path notably having two branches forming an angle, to a device for processing the said sheets.
  • Figures 1a and 1b which are diagrammatic views in partial longitudinal section of a device of the prior art enable the technical problem which faced the inventors to be understood.
  • the feeding device 10 which is depicted therein has, in the first place, a temporary storage area 11, here inclined with respect to the horizontal, and consisting, in this instance, of a plate the size of which is sufficient to be able to receive a pile of sheets 12, four of these having been depicted diagrammatically in cross section, with a deliberately exaggerated thickness in order for the technical problem to be more readily understood.
  • the device 10 is designed to enable the sheets to be made to advance one by one from the pile 12 along a predetermined transfer path 13 (illustrated using a dotted line in Figure 1a). It can be observed that the path 13 has two branches 13a and 13b forming an angle (obtuse in the embodiment illustrated in the figure) and joined at this angle by means of a rounded portion 13c.
  • the path 13 has an entry area and an exit area. The entry area is disposed immediately downstream of the temporary storage area 11.
  • the device has a separating drive roller 14 which is arranged so as to be in contact with a sheet 12a, which will, for the sake of convenience, be called the "first sheet”, and which is disposed at one of the ends of the pile 12 (in this instance it is the sheet located at the bottom end of the pile 12).
  • the roller 14 is also arranged so as to drive this sheet into a first part of the said path, in this instance the first branch 13a. To this end, it has a means for driving in rotation in the direction illustrated by the arrow 15.
  • the device also includes a friction device 16, which in this instance consists of a rubber blade bearing on the roller 14 in the direction shown by the arrow 16a, and which is also disposed at the entry to the path 13.
  • the friction device 16 is adapted to generate, at least on the first sheet 12a, a friction whose direction (arrow 17) is substantially opposite to the direction of driving of the first sheet 12a, the value of the friction force being determined, having regard to the rubbing exerted by the roller 14 on the sheet 12a, so as to enable the said first sheet to be driven while retaining the rest of the sheets in the pile 12.
  • the drive roller and the friction device thus separate the first sheet 12a from the rest of the pile 12.
  • the friction device can consist of means other than a blade: it can, for example, consist of a roller turning in such a way that the tangential speeds of the two rollers, in their area of contact, are in opposite directions.
  • the feeding device also has a guide device 18 designed to guide the first sheet from the first branch 13a of the path to the second 13b and arranged on a level with the angle formed in this instance by the section 13c.
  • the guide device has two curved surfaces, one forming a lower guide device 19 and the other forming an upper guide device 20. These surfaces substantially follow the shape of the path 13, and are spaced apart so as to permit the sheet 12a at least to enter therein.
  • the guide surfaces 19 and 20 are divided up and borne by longitudinal extension ribs, and distributed over the width of the transfer path 13.
  • the feeding device also includes a downstream drive device 21, consisting in this instance of two rollers 22, 23, the directions of whose rotation are illustrated respectively by the arrows 22a, 22b, and which is located downstream of the path 13 and designed to drive the first sheet 12a towards the exit from this path, along the second branch 13b of the latter.
  • a downstream drive device 21 consisting in this instance of two rollers 22, 23, the directions of whose rotation are illustrated respectively by the arrows 22a, 22b, and which is located downstream of the path 13 and designed to drive the first sheet 12a towards the exit from this path, along the second branch 13b of the latter.
  • the separation device formed by the roller 14 and the friction device 16 enables, as explained above, the first sheet 12a to be separated from the rest of the pile.
  • the sheet 12a is then driven by the roller 14 into the first part 13a of the path 13.
  • the guide surfaces 19 and 20 then guide the sheet towards the downstream pair of rollers 22, 23.
  • a processing device arranged downstream of the rollers 22, 23 which can, in the case of a facsimile machine, be a device for reading the documents consisting of sheets in the pile 12.
  • the downstream pair of rollers 22, 23 carries the sheet 12a at a speed substantially greater than the roller 14.
  • the sheet 12a is thus subjected to a resulting tension and tends to adopt the position shown diagrammatically by continuous lines in Figure 1b. It should be noted, in this respect, that it does not follow the ideal path 13 but, on the contrary, comes to rub against the rounded portion of the guide surface 20.
  • the primary object of the present invention is to resolve this technical problem.
  • the present invention attains these objectives since it concerns a sheet feeding device designed to transfer sheets to a processing device along a predetermined transfer path having an entry and an exit and two branches forming an angle, the device having an upstream drive device disposed at the entry to the said path to feed a sheet into a first part of said path, a lower guide device designed to guide the sheet from the first branch to the second and arranged on a level with the said angle, a downstream drive device arranged downstream of the said path and designed partially to drive the sheet towards the exit from the said path over a second part of the latter, device characterised in that it also includes:
  • the present invention fulfils the objectives that the inventors set for it.
  • the present invention affords a guide arrangement which is particularly adaptable in its use.
  • the device according to the present invention is, moreover, capable of absorbing variable tension forces.
  • the inventors observed that the resulting tension in the sheet described in relation to Figure 1b above was liable to vary according to the quality of paper used, climatic conditions (temperature, humidity) and the number of sheets in the pile 12.
  • the inventors observed that the said resulting tension is liable to vary in the course of the transfer of the sheet, the latter being, for example, subjected to jolts.
  • Such jolts can be generated, for example, in a facsimile machine in which the reading of a document sometimes takes place discontinuously owing to transmission problems.
  • the present invention advantageously enables variable tension forces to be compensated for.
  • the movable bearing means is arranged on the first branch of a lever while the pushing means has a spring exerting a pressure on the second branch of the lever.
  • Such an elastic device is in fact particularly suited to absorbing variable forces within a predetermined range.
  • the movable bearing means includes a means designed to reduce advantageously the friction on the first sheet at the level of the said angle and it preferably includes a roller.
  • the sheet feeding device of the present invention furthermore comprises a temporary storage area for the pile of sheets arranged upstream of the upstream drive device, the latter comprising an upstream drive roller disposed at the entry to the said path and arranged so as to be in contact with a first sheet disposed at one of the ends of the pile and drive it into a first part of the said path, a friction device disposed at the entry to the said path, opposite the drive roller and generating, at least on the said first sheet, a friction in a direction substantially opposite to the direction in which the said first sheet is driven, the drive roller and the friction device effecting the separation of the first sheet from the rest of the pile.
  • a temporary storage area for the pile of sheets arranged upstream of the upstream drive device comprising an upstream drive roller disposed at the entry to the said path and arranged so as to be in contact with a first sheet disposed at one of the ends of the pile and drive it into a first part of the said path, a friction device disposed at the entry to the said path, opposite the drive roller and
  • the present invention also proposes an image forming apparatus having a sheet feeding device as defined above.
  • the upper part of the fixed guide surface 20 is replaced by a bearing means 30 able to move in the plane of the angle formed by the branches 13a and 13b of the path 13, that is to say in the plane of the drawing.
  • the bearing means 30 is movable in a vertical direction, as illustrated by the double arrow 31.
  • the device also has a pushing means 40, formed in this embodiment by a spring, arranged so as to exert on the movable bearing means 30 at least one predetermined force (determined in this instance by the characteristics of the spring).
  • the spring 40 is mounted compressed between a fixed point 41 on the structure of the feeding device and the movable bearing means 30. The vertical movement of the latter is guided by a guide means which can be of any type and which is here represented diagrammatically by rails 32a, 32b.
  • the bearing means 30 exerts on the sheet 12a, by means of the pushing means 40 formed by the spring, a force tending to keep the sheet on the ideal path 13 and in particular on the curved section 13c of this path.
  • the bearing means 30 includes a means designed to reduce the friction on the first sheet 12a at the level of the angle formed by the two branches 13a, 13b of the path 13.
  • This friction reducing means consists here of a surface made of Teflon arranged at the bottom end 32 of the bearing means 30.
  • Teflon a surface made of Teflon arranged at the bottom end 32 of the bearing means 30.
  • other materials able to reduce friction can be suitable.
  • the bearing means 30 is replaced by a rotatable roller 33.
  • the shaft 33a of the roller 33 is also able to move in the plane of the angle formed by the branches 13a and 13b of the path 13 (double arrow 31).
  • the shaft 33a of the roller 33 is carried by a stirrup 34 which is guided in translation by rails depicted diagrammatically at 35a and 35b.
  • the shaft 33a of the roller 33 is carried by a stirrup 50 whose end supporting the shaft 33a forms the end of a first lever arm 51 of a so-called "compensation" lever 53.
  • This lever is mounted so as to rotate about a shaft 54, which is fixed to the structure of the feeding device and consequently forms a fixed point.
  • the end of the second lever arm 55 of the lever 53 is connected to a spring 56 here forming with the lever the pushing means.
  • the compression spring 56 is mounted on a fixed point 57 of the structure of the feeding device.
  • the spring 56 exerts a thrust on the end of the second lever arm 55, this thrust being retransmitted through the first lever arm 51 to the stirrup 50 carrying the shaft 33a of the roller 33.
  • Figure 5 illustrates, diagrammatically, another embodiment of the invention and a particular implementation of the device that has just been described in relation to Figure 4.
  • means identical or similar to those in Figure 4 bear the same reference numerals.
  • the temporary storage area 11, the drive roller 14, the friction device 16, the lower guide 19 and the ideal path 13 will be recognized. Downstream of the path 13 there are arranged rollers 22, 23, similar in function to the rollers described previously.
  • the movable bearing means 33 (a roller, in this instance) is also carried by a stirrup 50' at the end of the first arm 51' of a movable compensation lever 53'.
  • the second arm 55' of the lever 53' cooperates with a spring 56' bearing on a fixed point 57' of the structure of the device.
  • the axis 54' of rotation of the lever 53' is common with the axis of rotation of the upper downstream roller 22.
  • Such an arrangement enables one shaft to be dispensed with and, above all, enables the arrangement described in relation to Figures 1a and 1b to be used, partially at least, while avoiding the need to modify the structure in order to arrange a rotation axis 54' for the lever 53'.
  • the shaft 54' is also able to move in translation, in the plane of the angle formed by the branches 13a and 13b of the path 13.
  • the directions of translation are shown diagrammatically in Figure 5 by means of the double arrow 60.
  • the shaft 54' is guided in translation by means of a "horseshoe" guide 61 oriented in the direction shown by the double arrow 60.
  • the guide 61 is integrated into a guide 62 arranged downstream of the roller 33.
  • the extension of the guide 62 is substantially rectilinear and, downstream of the roller 33, it fulfils the same guiding function as the part of the rigid guide 20 arranged downstream of the part 13c of the path 13 described in relation to Figures 1a and 1b above.
  • the anchorage point 57' of the spring 56' is arranged on a part of the guide 62 disposed downstream of the downstream drive rollers 22, 23.
  • a spring 64 is arranged between a fixed point 65 and the axis 54', so as to push the roller 22 towards the roller 23 in order to squeeze the transferred sheet.
  • This arrangement moreover enables variations in the thickness of the sheets or in the documents of the pile 12 to be compensated for.
  • the device is, in principle, similar to the embodiment that has just been described in relation to Figure 5.
  • the feeding device is incorporated into a facsimile machine 100 having, in a conventional manner:
  • part of the reading device (the roller 105) and of the feeding device is arranged in a casing 115 pivoting about an axis shown diagrammatically under the reference numeral 111.
  • the control panel 112 of the facsimile machine is arranged on the top of the casing 115 .
  • the casing 115 is illustrated in unbroken lines in its closed position, in which the facsimile machine is operational. It is illustrated in dotted lines in its open position in which the user can intervene in the event of a paper jam, in order to unblock the facsimile machine.
  • the casing 115 has, firstly, a frame 116 bearing various elements of the reading and feeding device, and, secondly, a cover 117 bearing the control panel 112.
  • Figure 7 is an enlargement of the inset VII in Figure 6. It illustrates in greater detail the feeding device and the arrangement of the casing 115. Figures 8 to 10 enable the device to be better understood.
  • the feeding device includes, in addition to the storage plate 102, a separating drive roller 201, which is arranged so as to be in contact with the sheet at the bottom of a pile of sheets (in this instance of documents to be sent) disposed on the plate 102.
  • the pile of sheets has been depicted under the reference numeral 12.
  • the roller 201 is rotated in the direction shown by the arrow 202 by a geared motor drive device, not shown in this figure and having a conventional structure.
  • the device 200 also has a friction device 203 borne by the frame 116 and arranged in an opening 118 in the latter.
  • the friction device 203 has a rubber blade 204 mounted on a movable support 205, itself mounted so as to rotate by means of a shaft 206 (formed in this instance by journals fixed to the body of the framework 205) on bearings 119 on the frame 116 (see Figures 9, 10 notably).
  • the movable support 205 is pushed towards the roller 201, in the direction shown by an arrow 208, by means of a spring 209.
  • the spring 209 is a coil spring tensioned above the movable support 205 in order to exert the said pushing and attached to the frame 116 by hooks 114 (see Figure 8, in which the spring 209 is not depicted, and Figures 9,10).
  • the feeding device also has a prestressing mechanism 210 designed to compress the pile of sheets 12 so as to ensure contact between the bottom sheet and the roller 201.
  • the prestressing mechanism 210 includes, to this end, a lever 211 arranged, in this instance, so as to pivot about the shaft 206.
  • the lever 211 includes a pair of lateral prestressing arms 212 and an actuation arm 213.
  • a spring 214 is compressed between the actuation arm 213 and the movable support 205, to push the prestressing arms 212 towards the roller 201 through the pile of sheets 12.
  • the friction device 203 and in particular the movable support 205 and the spring 209, together with the prestressing mechanism 210, are the object of French patent application No 95.01163, whose content is incorporated herein by reference. Reference should therefore be made to that patent application for a more complete description of these devices.
  • the feeding device 200 also includes a downstream drive device formed in this instance by two downstream drive rollers, one lower 222, the other upper 223.
  • the directions of rotation of these rollers are respectively depicted diagrammatically by the arrows 222a, 223a.
  • the downstream drive rollers are designed to drive the sheet towards the exit from the path on which it is guided by the device described here.
  • only the lower downstream roller 222 is rotated by a geared motor device.
  • the latter of conventional structure, has not been depicted in the drawings.
  • the device 200 also has a guide device 220 having a divided guide surface 220a having substantially the same structure as the lower guide device 19 described above in relation to Figures 1a and 1b.
  • the device 200 also has a guide device having a divided upper guide surface 280.
  • the surfaces 220a and 220b serve essentially to guide the sheet at its ends.
  • the guiding of the sheet on its central part which would be liable here to be subjected to the tensions mentioned above in relation to Figures 1a and 1b, is essentially effected by the means described below and illustrated in the figures.
  • the peripheral speed of the rollers 222, 223 is substantially greater than that of the roller 201.
  • the geared motor system for driving the roller 201 includes, as in the state of the art, a disengagement system designed to come into action as soon as the sheet is squeezed by the downstream rollers 222, 223.
  • the device 200 includes a movable bearing means in the plane of the angle formed by the transfer path (which extends here from the area of contact 270 between the roller 201 and the blade 204 to the area of contact 272 between the rollers 222 and 223).
  • the movable bearing means includes a bearing roller 233.
  • the roller 233 is mounted, as in the embodiment described in relation to Figure 5, on a movable compensation lever 240 whose point of rotation is common with the axis of the upper downstream roller 223.
  • the lever 240 is illustrated in exploded perspective in Figure 8.
  • This lever is a moulded plastic component, arranged so as to house, firstly, the upper downstream drive roller 223 and the bearing roller 233.
  • the lever 240 has a body 241 arranged so as to house the said rollers, and lateral cheeks 242, only one of the latter being visible in Figure 8.
  • the cheeks 242 each have two bearings, one 243 designed to carry the shaft 225 of the roller 223 and the other 244 being arranged so as to carry a journal 226 arranged at each of the ends of the roller 233 and coaxial with the latter.
  • the bearings 243 and 244 are arranged so as to allow the free relative rotation of the shaft 225 and journals 226 with the bearings 243, 244.
  • the roller 223 is also free to turn relative to the shaft 225.
  • the lever 240 has, arranged on each side of the axis VII-VII, a stop 248 having a centring lug 249 ( Figure 7) for a spring 250 arranged so as to be compressed between the stop 248 and a bearing surface 251 fixed to the frame 116.
  • the shaft 225 which passes through the body of the lever 240 and that of the roller 223, extends, as seen in Figures 8 and 9, beyond the lateral cheeks 242 of the lever 240.
  • the frame 116 carries two bearings 227 moulded with this frame, themselves having a notch 228. Each notch 228 is adapted to receive one end of the shaft 225, while allowing the latter limited translation in the direction shown by the double arrow 229 ( Figure 8).
  • the device also has two springs 252 equivalent to the spring 64 described above in relation to Figure 5.
  • these springs which are leaf springs here, are arranged so as to exert a downward pressure on the shaft 225, only one of these having been depicted in Figure 8.
  • Each leaf spring 252 has a mounting section 253 and an active section 254.
  • the mounting section 253 enables the spring to be mounted on the frame 116 by means of a screw 258.
  • the active section has a section 259 at the end of which there are folded two flanges 255 each having an edge 256 coming to bear on the shaft 225 (see Figures 8 and 10).
  • a double system for detecting the front end of sheets, designed to facilitate loading is also provided.
  • This device whose structure is conventional, will not be described in detail here. It should, however, be noted that it informs the user that the documents are correctly loaded in the temporary storage area 101, and initiates, after a certain delay, the rotation of the roller 201 and the driving of the sheet in order for it to be read by the device 103.
  • the movable support 205 has two retaining arms 306, designed to limit, in cooperation with the frame 116, the angular travel of the movable support 205 when the casing 115 is in the open position (dotted lines) in Figure 6 (see also Figure 9).
  • the device operates as follows.
  • the lever 240 is held in place by the shaft 225, which is engaged in the notches 228 in the bearings 227.
  • the springs 252 bear, through the edges 256, on the shaft 225, so that the roller 223 is pushed towards the roller 222.
  • the roller 223 bears on the lower drive roller 222.
  • the movable bearing roller 233 is pushed towards the guide surface 220a by the spring 250. It will be observed that the roller 233 is in fact arranged at the end of a first lever arm formed by the separation between the axes of rotation of the roller 223 and of the roller 233. The distance between the axis of the shaft 225, which forms in this instance the bearing point of the lever, and the bearing surface 260 of the stop 248, for the spring 250, forms the second lever arm.
  • retaining means are arranged in the casing and on the stop 248, to limit the rotation of the lever 240 about the shaft 225, when the casing is in its open position (shown in dotted lines in Figure 6).
  • the movable bearing means formed here by the roller 233 absorbs the variable tensions present in the central part of the sheet and described above in relation to Figures 1a and 1b.
  • the mounting of the roller 233 on a movable compensation means such as the lever 240 enables any variations due to manufacturing tolerances in the positioning of the axis of the roller 223 to be compensated for. This is particularly advantageous when the roller 223 is mounted, as here, on a movable casing.
  • the friction device formed by a blade can be replaced by any other means, and notably a roller such as that described above.

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  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
EP19960400214 1995-02-01 1996-01-31 Dispositif d'alimentation de feuilles comportant un moyen d'appui mobile coopérant au guidage des feuilles le long d'un chemin de transfert et sollicité par un moyen de poussée Expired - Lifetime EP0725024B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9501162A FR2729938A1 (fr) 1995-02-01 1995-02-01 Dispositif d'alimentation en feuilles comportant un moyen d'appui mobile cooperant au guidage des feuilles le long d'un chemin de transfert et sollicite par un moyen de poussee
FR9501162 1995-02-01

Publications (2)

Publication Number Publication Date
EP0725024A1 true EP0725024A1 (fr) 1996-08-07
EP0725024B1 EP0725024B1 (fr) 2000-04-26

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EP19960400214 Expired - Lifetime EP0725024B1 (fr) 1995-02-01 1996-01-31 Dispositif d'alimentation de feuilles comportant un moyen d'appui mobile coopérant au guidage des feuilles le long d'un chemin de transfert et sollicité par un moyen de poussée

Country Status (3)

Country Link
EP (1) EP0725024B1 (fr)
DE (1) DE69607873T2 (fr)
FR (1) FR2729938A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60262745A (ja) * 1984-06-06 1985-12-26 Fujitsu Kiden Ltd 媒体給紙装置
EP0281820A2 (fr) * 1987-02-23 1988-09-14 Sharp Kabushiki Kaisha Système de transport de papier
US5102115A (en) * 1989-12-18 1992-04-07 Matsushita Graphic Communication Systems, Inc. Image reading device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60262745A (ja) * 1984-06-06 1985-12-26 Fujitsu Kiden Ltd 媒体給紙装置
EP0281820A2 (fr) * 1987-02-23 1988-09-14 Sharp Kabushiki Kaisha Système de transport de papier
US5102115A (en) * 1989-12-18 1992-04-07 Matsushita Graphic Communication Systems, Inc. Image reading device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 142 (M - 481) 24 May 1986 (1986-05-24) *

Also Published As

Publication number Publication date
FR2729938A1 (fr) 1996-08-02
EP0725024B1 (fr) 2000-04-26
DE69607873T2 (de) 2000-10-05
DE69607873D1 (de) 2000-05-31

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