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EP0367202B1 - Bogenzuführvorrichtung - Google Patents

Bogenzuführvorrichtung Download PDF

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Publication number
EP0367202B1
EP0367202B1 EP19890120134 EP89120134A EP0367202B1 EP 0367202 B1 EP0367202 B1 EP 0367202B1 EP 19890120134 EP19890120134 EP 19890120134 EP 89120134 A EP89120134 A EP 89120134A EP 0367202 B1 EP0367202 B1 EP 0367202B1
Authority
EP
European Patent Office
Prior art keywords
urging
sheet
weight
sheets
feeding
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
EP19890120134
Other languages
English (en)
French (fr)
Other versions
EP0367202A2 (de
EP0367202A3 (en
Inventor
Jun Saito
Toshiyuki Asakawa
Akira Higeta
Toru Kameyama
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
Canon Finetech Nisca Inc
Original Assignee
Canon Inc
Dai Ichi Seiki Kogyo 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 JP63275392A external-priority patent/JP2693977B2/ja
Priority claimed from JP63275391A external-priority patent/JPH02123029A/ja
Priority claimed from JP1178250A external-priority patent/JPH0342449A/ja
Priority claimed from JP1181563A external-priority patent/JP2615211B2/ja
Priority claimed from JP1238976A external-priority patent/JPH03102038A/ja
Application filed by Canon Inc, Dai Ichi Seiki Kogyo Co Ltd filed Critical Canon Inc
Publication of EP0367202A2 publication Critical patent/EP0367202A2/de
Publication of EP0367202A3 publication Critical patent/EP0367202A3/en
Application granted granted Critical
Publication of EP0367202B1 publication Critical patent/EP0367202B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B65H1/00—Supports or magazines for piles from which articles are to be separated
    • B65H1/04—Supports or magazines for piles from which articles are to be separated adapted to support articles substantially horizontally, e.g. for separation from top of pile
    • B65H1/06—Supports or magazines for piles from which articles are to be separated adapted to support articles substantially horizontally, e.g. for separation from top of pile for separation from bottom of 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
    • B65H1/00—Supports or magazines for piles from which articles are to be separated
    • B65H1/08—Supports or magazines for piles from which articles are to be separated with means for advancing the articles to present the articles to the separating device
    • B65H1/24—Supports or magazines for piles from which articles are to be separated with means for advancing the articles to present the articles to the separating device with means for relieving or controlling pressure of the pile

Definitions

  • This invention relates to a sheet feeding apparatus (sheet feeder) used -for an image-forming apparatus such as a copier or a laser beam printer. More particularly, the invention concerns a sheet feeder which can feed thick sheets such as envelopes one by one.
  • US-A-1,919,238 discloses a sheet feeder, which feeds sheets with the lowermost sheet in a sheet stack in contact with a feed roller.
  • US-A-3,963,339 discloses a sheet feeder, which feeds sheets with the lowermost sheet of a sheet stack in contact with a conveyor belt, and in which the sheet stack is urged against the conveyor belt by a lever.
  • a generic sheet feeding apparatus the construction of which shows an elongated arm with a pressing roller being rotatably supported in the middle thereof, with one end of said elongated arm being journaled by a shaft and the other end of said elongated arm being provided with a spring biasing this end against a stopper.
  • the size of the urging means in the sheet feeding direction is extended, and since the arm is disposed outside of the side plate, the size of the urging means in the direction of the sheet width is also extended, so that the known urging means becomes bulky, which causes various restrictions as regards the arrangement of the urging means.
  • the present invention is intended in the light of the above, and its object is to prevent the drawbacks inherent in the prior art.
  • the first urging member includes an outer weight and the second urging member includes an inner weight contained in the outer weight.
  • the urging means is constituted by a plurality of urging members, these urging members being coupled to one another such that they can be displaced vertically by a predetermined distance.
  • the number of urging members riding on the sheet stack is changed according to the number of sheets stacked on supporting means, thus changing the urging force of the urging means at least in two stages.
  • the sheets stacked on the supporting means are urged against the feeding means by the urging means to be fed out by the feeding means one by one from the lowermost one.
  • the urging means changes its urging force at least in two stages by changing the number of urging members riding on the sheet stack according to the number of sheets stacked on the supporting means.
  • the urging force applied to the sheet stack is reduced stepwise as above, when the number of remaining sheets in the stack becomes very small, the urging force may be excessive, possibly resulting in double or simultaneuous feeding of sheets.
  • urging means for a sheet feeder which can provide continuously reducing urging force to the sheet stack on stack support when the stacked sheets are reduced to a certain number.
  • a sheet feeder which comprises feeding means for feeding out stacked sheets one by one from the lowermost one, and urging means for urging the feeding means and urging the stacked sheets thereagainst, the urging means including a plurality of urging elements consisting of a second urging member comprising auxiliary urging elements which cease to provide urging action according to reduction of stacked sheets and a first urging member comprising main urging elements which provide continual urging action, the number of operative urging elements being thereby reduced stepwise according to the reduction of stacked sheets, a biasing member being provided between an auxiliary urging element and a main urging element for continuously reducing the urging force of the main urging elements.
  • the stacked sheets are urged against the feeding means by the urging means and are fed out one by one from the lowermost one.
  • the sheets are urged by both the auxiliary and main urging elements of the urging means.
  • the auxiliary urging elements cease to provide urging action, and only the main urging elements continually provide urging action.
  • the main urging elements are biased by biasing means such as to continuously reducing urging force with reduction of stacked sheets, thus preventing double feeding of sheets.
  • Fig. 1 is a sectional view best illustrating the features of the embodiment
  • Fig. 2 is a plan view showing the embodiment
  • Fig. 3 is a side view showing a driving system of the embodiment.
  • Sheet feeder 1 has a pair of positioning members 10 provided at its front end (i.e., left end in Fig. 1). It can be mounted in or dismounted from laser beam printer 2 serving as image forming means by inserting or removing the positioning members 10 into or out of holes 10b provided in an upper portion of housing 3 of the printer 2. Beneath the sheet feeder 1, the cassette 11 can be mounted in and dismounted from the laser beam printer 2. Ordinary sheets are stacked in the cassette 11. A wall of the laser beam printer 2 above the cassette 11 has a manual feed opening 3a, through which a sheet can be fed manually.
  • a housing 13 of the sheet feeder 1 has stack support 15 serving as supporting means for stacking sheets S thereon.
  • the stack support 15 has restricting members 16a and 16b for restricting the stacked sheets S against movement in the width directions.
  • the restricting members 16a and 16b have respective slidable racks 17 and 19 extending in the width direction of the stack support 15.
  • the racks 17 and 19 are in mesh with pinion 20 rotatably mounted on the back surface of the stack support 15.
  • the racks 17 and 19 with the respective integral restricting members 16a and 16b are movable in the width directions in an interlocked relation to each other.
  • a detecting lever 21 is pivotally mounted by pin 22 on the stack support 15 for detecting the presence or absence of sheets S.
  • a lower end portion of the lever 21 can be advanced into and retreated from an on-off operated photointerpreter 23 provided on the back surface of the stack support 15.
  • an upper end portion of the detecting lever 21 is turned upwardly with respect to the stack support 15, thus indicating the absence of sheet S.
  • feed roller 25 serving as feeding means is rotatably mounted for feeding sheets stacked on the stack support 15 one by one from the lowermost one.
  • a weight 26 serving as urging means is provided for vertical displacement with its opposite end ears 79b (see Fig. 2) loosely received in pair guide grooves 27 (see Fig. 2) provided in the housing 13.
  • the weight 26 serves to urge sheets S against the feed roller 25 in a manner as described later.
  • Sheets S are envelopes or like thick sheets.
  • Support member 29 (see Fig. 1) secured in position after the weight 26 in the sheet-feeding direction supports an end-restricting member 30 for restricting and aligning the front ends of sheets S stacked on the stack support 15.
  • the lower end of the end-restricting member 30 is spaced apart from the front end of the stack support 15 by a predetermined distance to permit feeding of sheets S through this space.
  • Separating pad support 31 secured to a lower portion of the support member 29 is provided with separating plate (separating pad) 32 serving as separating means made of rubber or like highly frictional material.
  • the separating pad 15 has a suitable inclination angle with respect to the sheet-feeding direction, in which each sheet S is fed out from the stack support 15.
  • An elastic member 33 having flexibility is secured in position such that it faces the separating pad 32 for urging sheets S fed out from the feed roller 25 against the separating pad 32 and thus preventing double feeding of sheets S.
  • Pair transport guides 35 and 36 for guiding sheet S and transport roller 37 are disposed after the separating pad 32 in the sheet-feeding direction.
  • a pinch roller 39 biased by a spring (not shown) is urged against the transport roller 37.
  • a bracket 40 secured in position above the transport guides 35 and 36 has microswitch 41 secured to it.
  • To bracket 40 is also pivoted by set screw 43 detecting lever 42 for detecting the set state of sheet feeder 1 with respect to laser beam printer 2.
  • Detecting lever 42 is biased in the counterclockwise direction in Fig. 1 by torsion spring 45 having the opposite ends secured to bracket 40 and detecting lever 42, respectively.
  • torsion spring 45 having the opposite ends secured to bracket 40 and detecting lever 42, respectively.
  • detecting lever 42 is urged by housing 3 and rotated in the clockwise direction in Fig. 1.
  • projection 42a of detecting lever 42 urges an operating lever of microswitch 41 and turns on the same, thus detecting the setting of sheet feeder 1.
  • sheet feeder 1 has a pair of side plates 46 and 47, which are formed with guide grooves 27 noted above for guiding weight 26.
  • Board 49 is secured by a plurality of supports to the outer surface of side plate 46. It undertakes control of drive motor 50 secured to its inner surface and also transfer of signals between laser beam printer 20 and sheet feeder 1.
  • To other side plate 47 is connected one end of cable 51, which connects sheet feeder 1 and laser beam printer 2 to each other.
  • Solenoid 53 for spring clutch control to be described later is secured to bracket 52 which is in turn secured to side plate 46.
  • Bracket 52 also serves as a grounding member to ground metal bearing 56 supporting transport roller 37 noted above.
  • relay gear 59 integral with relay gear 49a is rotatably supported by shaft 60 in support 57, which is secured in position at a suitable spacing from side plate 46.
  • Relay gear 59 is in mesh with gear 61 secured to output shaft 50a of drive motor 50.
  • Relay gears 62 and 63 meshing with relay gear 59 are supported by shaft 64 in support 57, and also relay gear 65 meshing with relay gear 59a is supported by shaft 66 in support 57.
  • Support 57 is electrically connected via shaft 64 to bracket 52.
  • Relay gear 62 meshing with relay gear 59 is coupled to gear 63 via clutch unit 55 having a well-known spring clutch.
  • Clutch unit 55 is on-off operated to on-off control drive power transmission of gears 62 and 63 under on-off control of solenoid 53.
  • Lever 53a for locking clutch unit 55 is pivoted to bracket 52. It is coupled at one end to spring 53b, which is provided on bracket 52, and thus it is spring-biased in the clockwise direction. Solenoid 53 serves to attract and release lever 53a.
  • Gear 63 is in mesh with gear 67 secured to shaft 25a of feed roller 25 (see Fig. 1).
  • Relay gear 65 is in mesh with gear 69 mounted on shaft 37a of feed roller 37.
  • a one-way clutch (not shown) is provided between shaft 37a and gear 69.
  • Torsion spring 71 is mounted on dowel 70 secured to side plate 46 and has its opposite ends attached to shaft 39a of pinch roller 39 and shaft 66, respectively. Pinch roller 39 is urged against transport roller 37 by the spring force of torsion spring 71.
  • reference numeral 72 designates a connection member for electrically connecting transport roller 37 via metal bearing 73 supporting roller 37. Connecting member 72 has a stem portion secured to side plate 46 and its free end bolted to shaft 66, and it also serves as cover of gear 69.
  • solenoid 53 is turned off to cut drive power transmission to feed roller 25.
  • the leading end of sheet S being fed has reached guide while the trailing end of the sheet is on feed roller 25.
  • the sheet is fed by the guide while feed roller 25 is rotated by the action of the one-way clutch.
  • Sheet S fed out from Sheet feeder 1 is fed by feed roller 75 in laser beam printer 2 as shown in Fig. 4 into housing 3.
  • Sheet S fed manually through manual feed opening 3a of laser beam printer 2 is detected by paper sensor 76 shown in Fig. 4 to be fed by feed roller 75 into housing 3 of laser beam printer 2 for printing and then discharging.
  • Laser beam printer 2 as shown in Fig. 4 has feed roller 75 for feeding out sheets S accommodated in cassette 11 and separating pad 180, which is urged by a spring (not shown) against feed roller 75 for blocking second and subsequent sheets S to separate the first fed sheet.
  • Reference numerals 181 and 182 designate transport guides. The leading end of a sheet fed out from the stationary state is brought into contact with a nip of pair registration rollers 183 for skew feeding before being fed with a timing synchronized to an image formed on photosensitive drum 185 to be described later.
  • Reference numeral 110 designates an image-forming unit, 185 a photosensitive drum, 186 a scanner for scanning photosensitive drum 185 with a laser beam for forming a latent image, 187 a developing unit for developing the latent image on the photosensitive drum to a tonor image, and 188 a transfer roller for transferring the tonor image formed on photosensitive drum 185 onto sheet.
  • Reference numeral 190 designates a fixing unit for fixing the transferred tonor image on the sheet, and 191 a tray for stacking sheets discharged after the fixing operation.
  • Reference numeral 184 designates a guide for guiding sheet from registration roller pair 183 to photosensitive drum 185, and 189 a torque conveyor for transporting the sheet from photo-sensitive drum 185 to fixing roller 190.
  • Sheets S stacked on stack support 15 with their leading ends aligned in contact with end-restricting member 30 are fed out one by one from the lowermost one Sa with an urging force provided by weight 26 and rotation of feed roller 25 in the direction of arrow.
  • subsequent sheets Sb, Sc, ... come out with sheet Sa due to frictional force between adjacent sheets.
  • separating pad 32 which has a high coefficient of friction. Consequently, only sheet Sa which directly receives the feeding force of feed roller 25 is advanced by surpassing the frictional resistance offered by separating pad 32, and it thus fed out by clearing end 32a of separating pad 32.
  • Elastic member 33 is a thin sheet having flexibility, with its stem portion secured to support 77.
  • the free end thereof is flexed toward the sheet-feeding direction, and the reaction force at this time has an effect of raising sheets Sa, Sb, Sc, ... toward upper separating pad 32, thus helping the separation of the sheet.
  • sheet Sa is transported by being guided by transport guides 35 and 36 to enter between transport roller 37 and pinch roller 39. The sequence of operations described above takes place for succeeding sheets Sb, Sc, ... for separation thereof.
  • Figs. 7 and 9 show, in a section taken along line B-B in Fig. 1, a state when there is no sheet on stack support 15 and a state when there are at least a certain number of sheets on the support, respectively.
  • Figs. 8 and 10 are sectional views corresponding to Figs. 7 and 9, respectively.
  • weight 26 includes outer weight 79 and inner weight 81.
  • Outer weight 79 has a channel-like sectional profile open upwardly.
  • Inner weight 81 is accommodated in outer weight 79 and has a channel-like sectional profile open downwardly.
  • a plurality of (i.e., two in Fig. 8) auxiliary weights 82 are accommodated in and secured by bolts 82a to inner weight 81. These auxiliary weights 82 are provided for controlling the weight of inner weight 81.
  • Weight cover 83 is fitted on outer weight 79 to permit weight 26 to be held with a hand of the operator.
  • weight cover 83 is formed with grooves 83a.
  • Pair pins 85 which penetrate weight cover 83 and outer weight 79 and are retained against detachment by E-rings 85a, also penetrate vertically elongate slots 80a and 80b formed in inner weight 81 and auxiliary weights 82.
  • inner weight 81 is capable of being displaced vertically with respect to outer weight 79 by the distance, by which pins 85 can be displaced along slots 80a and 80b.
  • Inner weight 81 has opposite end projections 81a and 81b, and stopper means or stoppers 46a and 47a formed as shoulders in side plates 46 and 47 of housing 13 are found below and face respective projections 81a and 81b.
  • Grounding spring 86 has one end connected to outer weight 79 for grounding the same. Its other end is secured to a grounding plate (not shown).
  • Outer weight 79 has projections 79b received in guide grooves 27 on the printer side.
  • Friction member 79c is applied to the outer surface of a bottom portion to vertical front side portion in the sheet-feeding direction of outer weight 79. It is made of a material having substantially the same coefficient of friction as that of sheet. Further, buffering members 79d are applied to opposite end portions of the inner surface of the bottom portion of outer weight 79.
  • inner weight 81 is separated from bottom 79a of outer weight 26, and only the weight the other part of weight 26 than inner weight 81 and auxiliary weights 82 is applied to sheets S.
  • This operation is graphically shown as in Fig. 12.
  • the urging force is constant from the instant when there is a full stack of sheets S until projections 81a and 81b engage with stoppers 46a and 47a.
  • This operation is represented by a plot segment from point a to point b.
  • the urging force is reduced from point b to point c.
  • the urging force is fixed until the number of stacked sheets becomes zero as represented by a plot segment from point c to point e.
  • the urging force is varied step-wise as shown above because the optimum urging force applied to sheets S is high when there are many stacked sheets S and low when there are a small number of sheets S.
  • a sufficient urging force can be ensured to provide a stable sheet-feeding force.
  • the number of stacked sheets is reduced, excessive urging force is prevented to prevent double feeding. If the urging force applied to the stack of sheets S is inadequate, defective feeding or double feeding is liable.
  • the urging force applied to the stack of sheets S is varied stepwise.
  • the urging force is still too high when remaining stacked sheets S are reduced to a very small number, and therefore double feeding of sheets S is liable.
  • Figs. 13 and 14 show weight (or urging means) 5 when there is no sheet S on stack support 15, while Figs. 15 and 16 show the weight when there is a stack of sheets S.
  • biasing member 7 consisting of a leaf spring having channel-shaped stem 7a is provided between weight cover 83 and inner weight 6, with a folded upper portion of stem 7a urged against the back or inner surface of weight cover 83.
  • Biasing member 7 has a pair of opposite side projections 7b and 7c projecting from its portion facing the folded portion.
  • Stem 7a of biasing member 7 is supported with projections 7b and 7c urgedly held in notches 9b formed in upper portions of the inner surface of the side portions of outer weight 9.
  • Biasing member 7 has arcuately curved feed end 7d, which urges a central portion of the inner surface of the top of inner weight 6.
  • a weight is applied to sheets S, which is the weight of weight 5 minus the sum of the weights of inner weight 6 and auxiliary weights 82 and an acting force provided by the elasticity of biasing member 7. Since distance h is reduced with reducing number of stacked sheets S, the urging force of weight 5 applied to sheets S is reduced progressively as shown in Fig. 12. More specifically, the urging force of weight 5 is changed in the order of points a , b, c and d in Fig. 12, and the urging force when there is no stacked sheet is less than that in the prior art case.
  • the point of action of biasing member 7 on inner weight 6 is set to be substantially the center of the top of inner weight 6 in order to permit automatic adjustment of urging forces on the opposite sides of the point of action lest the opposite side urging forces should be different in case of envelopes having different opposite side swelling portions as sheets S.
  • Inner weight 5, outer weight 9 and biasing member 7 are made of an electrically conductive material and are held in contact with one another. By so doing, weight 5 can be perfectly grounded.
  • Figs. 18 and 19 show a different example of urging means according to the invention.
  • biasing member 7 provided between weight cover 83 and inner weight 6 of weight 5 is a compression coil spring, and the other structure is the same as that of weight 5 shown in Figs. 13 and 14. With this example of weight 5, the same function and results as with weight 5 shown in Fig. 13 can be obtained when urging sheets S. While urging member 7 in this example and also that in the previous example of Fig. 13 are provided between weight cover 83 and inner weight 6, since weight cover 83 is made integral with outer weight 9 via pins 85, biasing member 7 equivalently intervenes between outer weight 9 and inner weight 6.
  • biasing member 7 is zero as shown by points a , b, c and d in Fig. 12, it is of course possible to permit variation of the urging force as shown at points a , b, f and g by providing biasing member 7 with a suitable initial biasing force.
  • the weight is provided with a friction member.
  • the lower or outer surface of the bottom portion of weight 5 has a pair of urging surfaces 5a for urging sheets S.
  • Urging surfaces 5a are provided with friction members 106 for preventing double feeding of sheets S.
  • the materials of friction members 106 and feed roller 25 are selected such as to satisfy a relation ⁇ 3 ⁇ ⁇ 1 ⁇ ⁇ 2 where ⁇ 1 is the coefficient of friction of between friction members 106 and sheet S, ⁇ 2 is the coefficient of friction between feed roller 55 and sheet S, and ⁇ 3 is the coefficient of friction between adjacent sheets S.
  • the coefficient ⁇ 1 of friction between friction members 106 provided on urging surfaces 5a of weight 5 and sheet S is greater than the coefficient ⁇ 3 of friction between adjacent sheets S and less than the coefficient ⁇ 2 of friction between feed roller 25 and sheet S as noted above, when it becomes that two sheets S remain on stack support 15, the feeding-out of the last sheet S from stack support 15 is prevented by the frictional force provided by friction members 106 of weight 5, and only the last but one sheet S (i.e., the lowermost sheet) is thus fed out by feed roller 55. It is thus possible to prevent double feeding of the last sheet along with the last but one sheet. In addition, since the frictional force provided by feed roller is greater than the frictional force provided by friction members 106, the last sheet can be fed out smoothly after completion of the feeding-out of the last but one sheet.
  • Friction members 106 are applied to the bottom surface to a front upright surface in the sheet-feeding direction. Friction members 106 are made of a material having substantially the same coefficient of friction as that of sheets. They are covered by or located inwardly of weight cover 83. In this construction, the operator inserts sheet stack S in the direction of arrow A. At this time, even if the leading ends of sheets S strike weight 5, they will never touch end portions of friction members 106 covered by or located inwardly of weight cover 83. The operator aligns the leading ends of sheets S by bringing them into contact with end-restricting member 30. Also, the operator restricts movement of sheets S in the width direction thereof by displacing restricting members 16a and 16b. Further, the operator lowers weight 5 to urge sheets S against feed roller 25.
  • detecting lever 21 for detecting sheet S is pivoted by pin 22 to stack support 15, and its lower portion can be advanced into and retreated from and thus on-off operate photointerpreter 23 provided on the back surface of stack support 15.
  • photointerpreter 23 provided on the back surface of stack support 15.
  • Stack support 15 is provided with escapement 15b for avoiding interference of sheet-detecting means (21, 23) with detecting lever 21.
  • detecting lever 21 disposed beneath weight 26 as shown in Fig. 25, the user can difficultly touch detecting lever even when there is no sheet S on stack support 15. Even if detecting lever 21 is touched, only its portion near the center of its rotation is touched.
  • the contact action is more delicate. That is, slightly touching a portion of detecting lever 21 near the rotational center thereof has no substantial adverse effects compared to the case of touching the free end of the lever. It is thus possible to realize prevention of erroneous operation or damage to detecting lever 21 due to touching.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)

Claims (6)

  1. Ein Blattfördergerät mit einer Trägereinrichtung zum Tragen gestapelter Blätter (S);
       einer Fördereinrichtung (25) zum Aufbringen einer Förderkraft auf das unterste Blatt der gestapelten Blätter;
       einer Druckeinrichtung (5; 26) mit einem ersten Druckteil (83, 9; 83, 79) und einem zweiten Druckteil (6, 82; 81, 82), jeweils zum Drücken der gestapelten Blätter auf die Fördereinrichtung; und
       einer Stoppereinrichtung (6a, 6b; 46a, 47a) zum Aufheben des Druckes eines der Druckteile auf die gestapelten Blätter, wenn die Anzahl der Blätter geringer als ein vorbestimmter Wert wird,
    dadurch gekennzeichnet, daß
    das erste Druckteil (83, 9; 83, 79) ein äußeres Gewicht (9; 79) umfaßt und das zweite Druckteil (6; 82; 81, 82) ein inneres Gewicht (6; 81) umfaßt, daß in dem äußeren Gewicht (9; 79) aufgenommen ist.
  2. Ein Blattfördergerät nach Anspruch 1,
    dadurch gekennzeichnet, daß
    die Druckeinrichtung weiter ein Vorspannteil (7) umfaßt, das zwischen dem ersten Druckteil (9, 82) und dem zweiten Druckteil (6, 82) vorgesehen ist, um jeweils das andere des ersten und zweiten Druckteiles (9, 83) umgekehrt zu deren Druckrichtung zu belasten nachdem der Druck durch eines der Druckteile (6, 82) weggenommen wurde.
  3. Ein Blattfördergerät nach Anspruch 1,
    dadurch gekennzeichnet, daß
    die Stoppereinrichtung (6a, 6b, 46a, 47a) einen Vorsprung (6a, 6b) umfaßt, der an einem der Druckteile (6, 82) vorgesehen ist und einen Stopper (86a, 47a), der an einer Seitenplatte (46, 47) des Blattfördergerätes vorgesehen ist, wobei die Vorsprünge mit den Stopper in Eingriff kommen, wenn die Anzahl gestapelter Blätter (S) einen bestimmten Wert erreicht, um den Druck des jeweiligen einen Druckteil (6, 82) aufzuheben.
  4. Ein Blattfördergerät nach Anspruch 1,
    dadurch gekennzeichnet, daß
    die Druckeinrichtung (5; 26) ein Reibelement (106) umfaßt, das an dessen mit den gestapelten Blättern (S) in Kontakt befindlichen Oberfläche vorgesehen ist, wobei das Reibelement in Reibkontakt mit dem Blattstapel ist.
  5. Ein Blattfördergerät nach Anspruch 1,
    dadurch gekennzeichnet, daß
    das Blattfördergerät weiter eine Separiereinrichtung (32, 32a) umfaßt, die stromunterhalb der Fördereinrichtung (25) schräg bezüglich der Blattförderrichtung angeordnet ist, wobei die Separiereinrichtung gestapelte Blätter (S) eins nach dem anderen vereinzelt indem die Reibkraft und eine Reibkraft zusammenwirken, die erzeugt wird, wenn ein spitzes Ende eines geförderten Blattes anstößt.
  6. Ein Bilderzeugungsgerät mit einem Blattfördergerät (1) nach einem der Ansprüche 1 bis 5 und einer Bilderzeugungseinrichtung zum Erzeugen eines Bildes auf einem Blatt, das mittels der Fördereinrichtung (25) des Blattfördergerätes (1) gefördert wird.
EP19890120134 1988-10-31 1989-10-30 Bogenzuführvorrichtung Expired - Lifetime EP0367202B1 (de)

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
JP63275392A JP2693977B2 (ja) 1988-10-31 1988-10-31 シート給送装置
JP275392/88 1988-10-31
JP63275391A JPH02123029A (ja) 1988-10-31 1988-10-31 シート給送装置
JP275391/88 1988-10-31
JP1178250A JPH0342449A (ja) 1989-07-11 1989-07-11 シート材給送装置
JP178250/89 1989-07-11
JP1181563A JP2615211B2 (ja) 1989-07-13 1989-07-13 シート材給送装置における押圧装置
JP181563/89 1989-07-13
JP1238976A JPH03102038A (ja) 1989-09-13 1989-09-13 画像形成装置における給紙装置
JP238976/89 1989-09-13

Publications (3)

Publication Number Publication Date
EP0367202A2 EP0367202A2 (de) 1990-05-09
EP0367202A3 EP0367202A3 (en) 1990-10-24
EP0367202B1 true EP0367202B1 (de) 1994-09-21

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Application Number Title Priority Date Filing Date
EP19890120134 Expired - Lifetime EP0367202B1 (de) 1988-10-31 1989-10-30 Bogenzuführvorrichtung

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EP (1) EP0367202B1 (de)
DE (1) DE68918393T2 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB827057A (en) * 1955-10-14 1960-02-03 Eastman Kodak Co Improvements in or relating to apparatus employing receptacles for flexible discreteelements of a sheet-like nature
US4305577A (en) * 1979-08-03 1981-12-15 International Business Machines Corporation Apparatus for applying, varying and removing a normal force in a shingler wheel type document feeder
JPS57156931A (en) * 1981-03-20 1982-09-28 Olympus Optical Co Ltd Automatic paper supply device
WO1986007339A1 (en) * 1985-06-06 1986-12-18 W. Rast Pty. Ltd. Coin operated paper vending machine

Also Published As

Publication number Publication date
DE68918393T2 (de) 1995-02-02
EP0367202A2 (de) 1990-05-09
DE68918393D1 (de) 1994-10-27
EP0367202A3 (en) 1990-10-24

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