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US3352554A - Device for separating two superimposed moving sheets - Google Patents

Device for separating two superimposed moving sheets Download PDF

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Publication number
US3352554A
US3352554A US562694A US56269466A US3352554A US 3352554 A US3352554 A US 3352554A US 562694 A US562694 A US 562694A US 56269466 A US56269466 A US 56269466A US 3352554 A US3352554 A US 3352554A
Authority
US
United States
Prior art keywords
sheets
feed cylinder
separating
shaft
sheet
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
US562694A
Other languages
English (en)
Inventor
Menzi Ulrich
Grigereit Helmut
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.)
BASF Schweiz AG
Original Assignee
Ciba AG
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 Ciba AG filed Critical Ciba AG
Application granted granted Critical
Publication of US3352554A publication Critical patent/US3352554A/en
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
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/58—Article switches or diverters
    • B65H29/64—Article switches or diverters directing the components of composite articles into separate paths
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/02—Exposure apparatus for contact printing
    • G03B27/14—Details
    • G03B27/24—Separating the original from the print
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/17—Nature of material
    • B65H2701/176—Cardboard

Definitions

  • the invention relates to a device for separating two superimposed moving sheets.
  • a separating device has been proposed for use in a blueprint copying apparatus, for example, and comprises a separating element spaced from a feed cylinder the separating element being a second cylinder which operates as a feed cylinder for the conveying of the superimposed sheets until operation of a switch reverses the direction of rotation thereof the switch being operated by the sheets which are to be separated.
  • a first disadvantages of this device can be seen in the fact that as soon as the sheet opposite the separating cylinder (copy) has been lifted up the second cylinder then rubs against the back of the original, which remains between the two cylinders, and thereby tends to push this back also.
  • the original has then to be conveyed through the cylinders; in the case of oflice copying machines however, this may cover the range from very thin (air mail) up to very thick, cardboard-like papers so that the distance has to be set individually for every thickness of the original, which is disadvantageous with regard to the operating of the apparatus.
  • a further proposed sheet separating device likewise provides, as a solution of this adjusting problem a separating element in the form of a cylinder rotating in the backward feed direction which has to be swung in manually into position and then swung out again after the sheets have been separated.
  • this arrangement is relatively simple, but with a corresponding automatic form it entails an expenditure which is excessive for the simpler applications (e.g. the simpler ofiice copying machines).
  • another proposed separating device subdivides the feed cylinder and also a counter-cylinder rotating in the backward direction into single, mutually olfset roller and disc segments, the counter-elements of which are formed of flat belts which are stretched through between the single roller and disc segments.
  • the object of the invention is to create a separating device especially for ofiice copying apparatuses which, at low cost and with the maximum protection of the sheet material, ensures the perfect and functionally dependable separation of two moving sheets, one lying upon the other.
  • the invention provides a device for separating two superimposed sheets comprising (a) a rotatable feed cylinder over which the sheet to be separated are intended to be passed,
  • FIGURE 1 shows in a perspective diagram the essential separating elements according to the invention
  • FIGURES 2-4 are sections through the arrangement in FIGURE 1 showing different stages of the separating process and FIGURE 5 shows the separating device of FIGURES 1-4 with the associated coupling elements.
  • rubberized cylinder 1 rotates in the direction marked by an arrow and acts simultaneously as feed cylinder for sheets 4 (copy) and 5 (original) which are to be separated.
  • a shaft 2 Disposed above the cylinder 1 and parallel to it is a shaft 2 which is covered with a rubber profile 3 which has a flap 3a.
  • the flap In the first phase of the separating process, shown in FIG- URE 2, the flap is not in contact with the copy sheet 4 the separating device being in its neutral position.
  • the sheets are pushed over the cylinder 1 and operate a switch 13 which initiates rotation of the shaft 2 in the clockwise direction (FIGURE 2).
  • FIGURE 3 shows the operational phase of the shaft 2 in which the flap 3a presses the sheets on to the feed cylinder 1. Since the coefficients of friction between the cylinder 1 and the original 5, on the one hand, and between the flap 3a and the copy sheet 4, on the other, are greater than the coeflicient of friction between the original and the copy sheet 4, the original as moved onwards in the direction of the arrow, while on the other hand the copy sheet 4 is pushed backwards and therby forms a hump indicated by 4'.
  • FIGURE 4 shows a last phase before the shaft 2, or rather the flap 3a, has returned to its neutral position.
  • the flap which has been bent back considerably in an elastic manner by the counterpressure of the cylinder 1 (FIGURE 3) is now released suddenly and jerks back into its relative neutral position.
  • the sheet 4 thus flung away simultaneously by the separating device, so that the risk of entanglement of the copy in the separating device, cap be eliminated.
  • the shortest distance between the rubber profile 3 on the shaft 2 or the base of the flap 3a and the surface U of the feed cylinder 1 should be selected to be so small that the flap 3a can just be pulled between the shaft 2 and the feed cylinder 1. This distance depends substantially on the elasticity of the flap 3a and on the torque which should or can be applied to the shaft 2. In order to ensure reliable sheet separation, larger flap lengths I must be accepted in the case of greater distances, which however is disadvantageous in its eflect on the separation operation. It has been found that optimum results are obtained if the distance between the rubber profile 3 and the periphery U of the feed cylinder is about twice the thickness d of the flap 3a.
  • the distance s between the point of contact K of the sheet 5 and the periphery U of the feed cylinder 1 and the feeler of the switch 13 triggering the rotation of the shaft 2 is slightly smaller than or equal to the radius r, which is described by the end R of the flap 3a with the length l on rotation of the shaft 2, the optimum dimensioning depending on the relative speed between the advance of the sheets 4 or 5 and the speed of rotation of the shaft 2 or of the flap 3a respectively, taking into account the retardation time between response of the feeler of the switch 13 to the beginning of the rotation of the shafts 2. If s is substantially smaller than r, both sheets 4 and 5 are diverted into the new path; if on the other hand s is greater than r, the dependable lifting of the sheet 4 off the sheet 5 lying therebeneath is no longer ensured.
  • the mechanical feeler illustrated may also be replaced by a light barrier or the like.
  • FIGURE 5 shows a coupling mechanism according to the invention for initiating a single rotation of the shaft 2.
  • the latter has at its end a rigidly mounted driving plate 12 and a sprocket wheel 7 which is straightened at one place in such a manner that a continuously moving chain 6, which may be the general driving chain for the copyingapparatus, is prevented from driving the sprocket wheel 7 when the separating device is in the neutral position.
  • a magnet 9, the winding of which is energized by the switch 13 via a lead 14, has an armature 15 at the free end of which a pawl 11 is articulated. The pawl 11, when in the neutral position, engages with a driving pin 10 on V p the driving plate 12.
  • the switch 13 When the sheets to be separated enterthe separating device, the switch 13 is operated, current flows through the exciting winding of the magnet 9 and the armature is drawn up.
  • the pawl 11 turns the driving plate 12 through the driving pin 10 in a counterclockwise direction and with it the shaft 2 and the sprocket wheel 7.
  • the sprocket wheel 7 engages with the chain 6, whereby a leaf spring 8 ensures correct engagement of the teeth of the sprocket wheel 7 with the links of the chain 6.
  • the sprocket wheel, driving plate, shaft 2 and rubber profile 3 now execute a full revolution. On return to its initial position the sprocket wheel 7, owing to pressure from the spring 8 via the chain 6 on the flat chord of the sprocket wheel, remains in the neutral position and hence also do the shaft 2 and the profile 3.
  • the separating device according to the invention can be used, not only in the case of office copying machines, but in all application where two moving sheets, one on top of the other, have to be separated.
  • a device for separating two superimposed sheets comprising (a) a rotatable feed cylinder over which the sheets to be separated are intended to be passed,
  • the elastic flap is a tangential extension of a sleeve fitted around said shaft, the sleeve being made of rubber.
  • the drive means comprises a sprocket wheel mounted at one end of the shaft and rotatable therewith, driver means also mounted at said one end and rotatable with said shaft said sprocket wheel having a flattened portion along one chord thereof, chain drive means, spring means for urging the chain drive into contact with said sprocket wheel, whereby the chain drive will be in driving engagement with the sprocket wheel except when the chain is in contact with the flattened portion of said sprocket wheel.
  • the driver means consists of a driving plate, a pin being mounted on said driving plate, the drive means further comprising a magnet energisable on actuation of said switch, an armature comprised in said magnet, a pawl articulated on said armature and being normally in engagement with the pin, whereby when the magnet is energised, movement of the armature causes the pawl to urge the pin in a direction such that the driving plate and with it the sprocket Wheel rotate whence the sprocket wheel is brought into driving engagement with the chain drive.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
US562694A 1965-07-06 1966-07-05 Device for separating two superimposed moving sheets Expired - Lifetime US3352554A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH946365A CH430451A (de) 1965-07-06 1965-07-06 Vorrichtung zum Trennen von zwei sich bewegenden, aufeinanderliegenden Blättern

Publications (1)

Publication Number Publication Date
US3352554A true US3352554A (en) 1967-11-14

Family

ID=4352239

Family Applications (1)

Application Number Title Priority Date Filing Date
US562694A Expired - Lifetime US3352554A (en) 1965-07-06 1966-07-05 Device for separating two superimposed moving sheets

Country Status (6)

Country Link
US (1) US3352554A (sv)
BE (1) BE683665A (sv)
CH (1) CH430451A (sv)
GB (1) GB1141076A (sv)
NL (1) NL6609041A (sv)
SE (1) SE323879B (sv)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3537703A (en) * 1968-02-05 1970-11-03 Xerox Corp Manifold sheet separating device
US3776546A (en) * 1972-10-17 1973-12-04 Cx Processing Laboratories Selective article director multiposition gate
US4213602A (en) * 1974-07-16 1980-07-22 De Staat Der Nederlanden, Te Dezen Vertegenwoordigd Door De Directeur-Generaal Der Posterijen, Telegrafie En Telefonie Switching device for letters and the like
US4786047A (en) * 1986-09-02 1988-11-22 Magnetec Corporation Document presentor
US5843276A (en) * 1994-09-06 1998-12-01 King Jim Co., Ltd. Device for peeling off edge portion of sheet provided with release paper

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3017179A (en) * 1958-09-09 1962-01-16 American Photocopy Equip Co Sheet separator device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3017179A (en) * 1958-09-09 1962-01-16 American Photocopy Equip Co Sheet separator device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3537703A (en) * 1968-02-05 1970-11-03 Xerox Corp Manifold sheet separating device
US3776546A (en) * 1972-10-17 1973-12-04 Cx Processing Laboratories Selective article director multiposition gate
US4213602A (en) * 1974-07-16 1980-07-22 De Staat Der Nederlanden, Te Dezen Vertegenwoordigd Door De Directeur-Generaal Der Posterijen, Telegrafie En Telefonie Switching device for letters and the like
US4786047A (en) * 1986-09-02 1988-11-22 Magnetec Corporation Document presentor
US5843276A (en) * 1994-09-06 1998-12-01 King Jim Co., Ltd. Device for peeling off edge portion of sheet provided with release paper

Also Published As

Publication number Publication date
CH430451A (de) 1967-02-15
GB1141076A (en) 1969-01-22
BE683665A (sv) 1967-01-05
NL6609041A (sv) 1967-01-09
SE323879B (sv) 1970-05-11

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