EP0065309A2 - Dispositif pour l'alimentation d'un tambour xerographique tournant en feuilles pour copiage - Google Patents

Dispositif pour l'alimentation d'un tambour xerographique tournant en feuilles pour copiage Download PDF

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Publication number
EP0065309A2
EP0065309A2 EP82104316A EP82104316A EP0065309A2 EP 0065309 A2 EP0065309 A2 EP 0065309A2 EP 82104316 A EP82104316 A EP 82104316A EP 82104316 A EP82104316 A EP 82104316A EP 0065309 A2 EP0065309 A2 EP 0065309A2
Authority
EP
European Patent Office
Prior art keywords
copy sheet
rocker
guide
photo drum
roller pair
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
EP82104316A
Other languages
German (de)
English (en)
Other versions
EP0065309B1 (fr
EP0065309A3 (en
Inventor
Lajos Szekely
Gábor Bereck
László Dipl.-Masch.-Ing. Bernath
György Dipl.-Masch.-Ing. Neumann
Jószef Kiss
Lajos Szilveszter
Károly Toth
Jószef Jaszter
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.)
Irodagepipari Es Finommechanikai Vallalat
Original Assignee
Irodagepipari Es Finommechanikai Vallalat
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 Irodagepipari Es Finommechanikai Vallalat filed Critical Irodagepipari Es Finommechanikai Vallalat
Publication of EP0065309A2 publication Critical patent/EP0065309A2/fr
Publication of EP0065309A3 publication Critical patent/EP0065309A3/de
Application granted granted Critical
Publication of EP0065309B1 publication Critical patent/EP0065309B1/fr
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/163—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using the force produced by an electrostatic transfer field formed between the second base and the electrographic recording member, e.g. transfer through an air gap
    • G03G15/1635—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using the force produced by an electrostatic transfer field formed between the second base and the electrographic recording member, e.g. transfer through an air gap the field being produced by laying down an electrostatic charge behind the base or the recording member, e.g. by a corona device
    • G03G15/164—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using the force produced by an electrostatic transfer field formed between the second base and the electrographic recording member, e.g. transfer through an air gap the field being produced by laying down an electrostatic charge behind the base or the recording member, e.g. by a corona device the second base being a continuous paper band, e.g. a CFF

Definitions

  • the invention relates to a device for applying a running copy sheet to a revolving photo drum, with a driven feed roller pair and a driven output roller pair arranged above the same, which are arranged on the side of the photo drum on which the direction of movement of which is directed upwards, at a distance from the photo drum , and with a guide device, by means of which the copy sheet can be fed laterally from below along a guide path between the feed roller pair and the output roller pair of the photo drum and can be deflected upwards in an arc in the direction opposite the feed direction to the output roller pair and in the region of the apex of the Guideway can be placed laterally on the photo drum.
  • a device of this type is known from US-PS 42 18 128.
  • the copy sheet is held on the desired guide path from the pair of feed rollers to the pair of discharge rollers by guide plates and additional pressure and guide rollers.
  • the contact between the photo drum and the copy sheet required for a perfect transfer of the image is ensured in particular by a pressure roller arranged directly behind the corona, as seen in the transport direction of the copy sheet, by means of which the copy sheet is held in contact with the photo drum.
  • the object of the invention is to develop a device of the type mentioned at the outset in such a way that as few driven conveying elements or conveying rollers as possible are required for the transport of the copying sheet along the guideway, with a largely unobstructed view of the copying sheet guide, without any regard to the synchronization still has to be accepted due to insufficient contact between the copy sheet and the photo drum defects.
  • the guide device has a guide rocker which is mounted at a distance from its center of gravity and which can be freely pivoted through 360 ° about an axis running parallel to the axis of the photo drum from a basic position which it assumes under its weight and which has a hook with a catch notch arranged in the basic position of the rocker in the path of the leading copy sheet edge emerging from the roller gap of the feed roller pair, so that the rocker can be pivoted upwards against its weight against its weight from the basic position under the drive of the feed roller pair, and thereby thereby causes the deflection of the copy sheet and its application to the photo drum, and one of the leading copy sheet edge at a lifting point at which the swing arm with the catch notch of its hook has exceeded the upper vertex of its swivel arch, lifting out of the catch notch and into the roller gap of the A.
  • Output roller pair feeding dispensing device is mounted at a distance from its center of gravity and which can be freely pivoted through 360 ° about an axis running parallel to the
  • No driven conveying elements are for the inventive copy sheet guide along the guide track thus required since the leading edge of the copy sheet the F EADERSHIP rocker pivoted about its axis.
  • the radial distance of the leading copy sheet edge on Taking and preferably elastically attached hook on the rocker from the axis of the rocker is so large that a non-contact, but tight pivoting of the hook past the photo drum is possible. So that the alignment of the rocker in its basic position is ensured without additional devices, the swing arm carrying the hook is either somewhat longer or somewhat heavier by other means - for example thicker than the other swing arm.
  • Another major advantage of the copy sheet guide according to the invention is in particular that the elasticity of the guide device consisting essentially of a rocker and hook without additional guide devices in the area of the apex of the guideway causes the copy sheet to bulge in the direction of the photo drum and, consequently, makes it very easy to apply Photo drum can be reached.
  • the elasticity of the guide device can be achieved, for example, by an articulated attachment of the hook the swingarm can be achieved. It is particularly advantageous
  • the hook is designed as a spring arm projecting from the end of the rocker plate, the free end of which is approximately Z-shaped to form the catch notch.
  • a separate stop or a catch device for the rocker can be arranged in the area of the pair of feed rollers. It has proven to be particularly advantageous, however, that a guide gap for the copy sheet is connected to the roller gap of the feed roller pair at the outlet thereof and the upper boundary plate of the guide gap is designed as a catch plate, from the free edge of which the hook of the spring arm of the rocker arm, which when swinging down too their resilient braking with the hook strikes the boundary plate until the catch notch formed in the hook slides onto the mouth of the guide gap.
  • the running edge of the copy sheet is lifted out of the hook of the rocker at the end of the guideway by the output guide device, which preferably has a lifting lever which can be pivoted about an axis arranged between the photo drum and the rocker axis parallel to this against the force of a return spring the swinging arm, which crosses the upper vertex of its swivel arc, can be taken along by means of a stop, from which the lifting lever slides off at the point of extraction when the leading copy sheet edge arrives and, under the force of the spring, lifts the leading copy sheet edge up to a position in which the leading copy sheet edge rises the roll gap of the output roll pair is aligned.
  • the output guide device which preferably has a lifting lever which can be pivoted about an axis arranged between the photo drum and the rocker axis parallel to this against the force of a return spring the swinging arm, which crosses the upper vertex of its swivel arc, can be taken along by means of a stop, from which the lifting lever slides off at
  • the copy guide device according to the invention is in the area of the output guide device tion does not require a driven roller or roller through which the copy sheet is conveyed from the guide path to the pair of output rollers. In some cases, however, it can be advantageous if the output guide device has an additional drive roller to which the paper sheet that has been lifted out can be placed by means of the lifting lever.
  • the guideway 1 of a copy sheet 2 can be seen, which is carried to transfer a toner image to a photo drum 3 in such a way that in the area 4 of a - not shown - corona there is a flat contact between the photo drum 3 and copy sheet 2. Among other things, this promotes the quality of the transferred toner image.
  • the copy removed from a copy sheet cassette (not shown here) sheet 2 via a driven feed roller pair 5 and by an adjoining guide gap formed between a limiting plate 6 and a lower guide plate 7 into the guide track 1 provided for the transfer of the toner image (FIG. 1).
  • the ends 8 of the boundary plate 6 and the guide plate 7 which face the pair of feed rollers 5 are bent open in a mouth shape, so that the leading edge of a fluttering copy sheet 2 is also captured and threaded into the guide gap with certainty.
  • the guide plate 7 consists of a section 9 which runs parallel to the boundary plate 6 and a deflection part 10 which is angled in steps from the boundary plate 6 and is then curved in accordance with the guide track 1 and ends at a short distance from the photo drum 3.
  • the limiting plate 6 is formed except for the end 8 as a flat plate, the end facing the photo drum 3 protruding beyond the step in the guide plate 7 and serving as a stop surface 11 for a hook 12 which acts as a rocker arm 13a from the end of the heavier swing arm 13a
  • Spring arm 14 protrudes approximately tangentially from the radial edge of the swing arm 13a in the counterclockwise direction and a catch notch 15 is bent at its free, approximately Z-shaped end.
  • the convex bend 16 of the free end of the spring arm 14 seen from the pair of feed rollers 5 interacts with the stop surface 11 as a stop.
  • the catch notch 15 is formed from the pair of feed rollers 5 as a concave curvature.
  • the apex of the catch notch 15 lies at the level of the leading edge of the copy sheet 2 emerging from the guide gap between the boundary plate 6 and guide plate 7.
  • the length of the swing arm 13a is so be Measure that a smooth movement between the hook 12 or catch notch 15 on the one hand and the guide plate 7 or its deflecting part 10 on the other hand is possible.
  • the rocker 13 is mounted at point 17. Due to the high elasticity of the system of rocker 13 and spring arm 14, the movement path of the free end of the spring arm 14 can deviate from the circular path predetermined by the length of the swing arm 13a. This enables a flat contact between the photo drum 3 and the copy sheet 2 in the area of the corona 18 in a simple manner.
  • a plate 20 is fastened here, for example, on the rear wall of the corona housing, at the upper free end of which a spring 21 is attached, the other end of which is attached to one Lifting lever 22 is attached.
  • the lifting lever 22 is articulated at one end to the plate 20 at point 23. Its other end, which makes up about a third of its total length, is bent counterclockwise at an obtuse angle ⁇ of approximately 150 °. The end of the bent part of the lifting lever 22 projects radially beyond the circular path described by the swing arm 13a in the starting position thereof (FIG. 2).
  • An essential feature of the copy sheet guide according to the invention is in particular that the rocker 13 and the lifting lever 22 have spaced-apart bearing points 17 and 23, so that an intersection of the circles described by the rocker or the swing arm 13a and the lifting lever 22 is achieved, which is approximately lies at the intersection of a straight line passing through the bearing points 17 and 30 with the circle of the rocker 13.
  • a drive roller 25 is arranged such that it comes into contact with the copy sheet 2 running along the tangent through the gap of the output roller pair 24 to the guideway 1.
  • the free end of the lifting lever 22 extends up to this tangent, so that a copy sheet 2 lying on the drive roller 25 also bears against the upper end edge of the free end of the lifting lever 22 and is supported by it, so that the copy sheet 2 is reliably kinked in the direction (arrow 36) of the circle described by the swing arm 13a is avoided.
  • the lifting lever 22 assumes a position defined by a stop 28 between the drive roller 25 and a guide plate 26, the guide surface 27 of which lies in the plane of the aforementioned tangent.
  • the end of the guide plate 26 facing the photo drum 3 is bent such that copy sheets 2 abutting the guide plate 26 below the tangent are also guided to the guide surface 27.
  • a driving pin 29 projecting in the direction parallel to the axis of the rocker 13 is arranged.
  • the driving pin 29 By means of the driving pin 29, when the rocker 13 rotates, the lifting lever 22 is carried against the spring force of the spring 21.
  • point P this is the intersection of the circle described by the leading edge of the swing arm 13a or by the driving pin 21 with the circle from the free End of the lifting lever 22, which is pivoted about the bearing 23 in a clockwise direction, described circle, swing arm 13a and lifting lever 22 come out of engagement, so that the lifting lever 22 springs back under the force of the spring 21 into the position predetermined by the stop 28.
  • a locking lever 31 is pivotally suspended at point 30, which is held in the rest position under the force of a spring 32 in the position shown in FIG. 2.
  • the locking lever 31 has on its side facing the photo drum 3 a detent 33 which is formed above the horizontal diameter of the circle described by the swing arm 13a on the locking lever in the form of a projecting prong.
  • This latch 33 can hold the swing arm 13a in the position (locking position) of the locking lever 31 shown in FIG. 3.
  • the locking position of the locking lever 31 is achieved by pivoting it about the axis 30 in a clockwise direction. The pivoting takes place against the spring force of the spring 32.
  • the locking lever 31 projects through in the starting position (FIG. 2) with its free end the limiting plate 6 and the guide plate 7, which are slotted accordingly up to the point 34.
  • the copy sheet 2 is inserted into the guideway 1 by the feed roller pair 5 in the direction of arrow 35 and, after leaving the feed roller pair 5, enters the guide gap delimited by the boundary plate 6 and the guide plate 7.
  • the free end of the locking lever 31 is taken.
  • the free, rounded end of the locking lever 31 slides onto the surface of the copy sheet 2 facing the bearing 17 of the rocker 13. In this position (detent position - see Fig. 3) the locking lever 31 with its free end on the copy sheet 2 against the force of the spring 32 is kept sliding until after the trailing edge of the copy sheet 2 of the locking lever 31 is released and the same can snap back into the starting position.
  • the leading edge of the copy sheet 2 engages in the catch notch 15 after leaving the guide gap and moves the swing arm 13a clockwise along the guideway 1 via the spring arm 14. During this movement process, the copy sheet 2 is bent and radially by the resulting weight of the swing arm 13a supported on the outside of the deflection part 10 of the guide plate 7. In the area of the corona 18, the copy sheet 2 comes into flat contact with the photo drum 3 under the resulting weight of the swing arm 13a.
  • the swing arm 13a is held by the locking lug 33 formed in the locking lever 31 (FIG. 3).
  • the swing arm 13a comes out of engagement with the latching lug 33.
  • the - here longer - swing arm 13a falls down until it strikes the end of its spring arm 14 on the boundary plate 6 and slips over its free edge.
  • the copy sheet is transported exclusively by the drive roller 25 and by the output roller pair 24.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Discharge By Other Means (AREA)
EP19820104316 1981-05-18 1982-05-17 Dispositif pour l'alimentation d'un tambour xerographique tournant en feuilles pour copiage Expired EP0065309B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HU139281 1981-05-18
HU139281A HU181331B (en) 1981-05-18 1981-05-18 Rocker sheet guiding device particularly for picture transmitting unit of electrophotographic duplicator

Publications (3)

Publication Number Publication Date
EP0065309A2 true EP0065309A2 (fr) 1982-11-24
EP0065309A3 EP0065309A3 (en) 1983-06-15
EP0065309B1 EP0065309B1 (fr) 1984-04-04

Family

ID=10954258

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820104316 Expired EP0065309B1 (fr) 1981-05-18 1982-05-17 Dispositif pour l'alimentation d'un tambour xerographique tournant en feuilles pour copiage

Country Status (6)

Country Link
EP (1) EP0065309B1 (fr)
CS (1) CS336482A2 (fr)
DD (1) DD202603A5 (fr)
DE (1) DE3260091D1 (fr)
HU (1) HU181331B (fr)
PL (1) PL129961B1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4218128A (en) * 1977-01-11 1980-08-19 Ricoh Company, Ltd. Duplex copying machine
DE2925323A1 (de) * 1979-06-22 1981-01-22 Siemens Ag Elektrographisches geraet

Also Published As

Publication number Publication date
PL129961B1 (en) 1984-06-30
CS336482A2 (en) 1985-07-16
EP0065309B1 (fr) 1984-04-04
HU181331B (en) 1983-07-28
EP0065309A3 (en) 1983-06-15
DD202603A5 (de) 1983-09-21
DE3260091D1 (en) 1984-05-10
PL236486A1 (fr) 1982-12-06

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