US3829702A - Method and arrangement for checking the alignment of a paper sheet in paper sheet feed apparatus - Google Patents

Method and arrangement for checking the alignment of a paper sheet in paper sheet feed apparatus Download PDF

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Publication number
US3829702A
US3829702A US00292720A US29272072A US3829702A US 3829702 A US3829702 A US 3829702A US 00292720 A US00292720 A US 00292720A US 29272072 A US29272072 A US 29272072A US 3829702 A US3829702 A US 3829702A
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US
United States
Prior art keywords
hook
paper
paper sheet
sheet
retarding
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Expired - Lifetime
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US00292720A
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English (en)
Inventor
A Eriksson
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PRINTING EQUIPMENT AB
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PRINTING EQUIPMENT AB
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Publication date
Application filed by PRINTING EQUIPMENT AB filed Critical PRINTING EQUIPMENT AB
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Publication of US3829702A publication Critical patent/US3829702A/en
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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
    • B65H9/00—Registering, e.g. orientating, articles; Devices therefor
    • B65H9/20—Assisting by photoelectric, sonic, or pneumatic indicators

Definitions

  • the paper sheet When the paper sheet is removed from a stack of such sheets it is advanced to the receiving machine,'e.g. the printing press, folding machine or similar paper sheet treating machine, normally over a feed table having endless conveyor belts and conveyor rolls.
  • the lower portion of the table serves as a register table having means for aligning the paper sheet.
  • the conveying means on the feed table are provided with speed retarding means to ensure that the paper sheet arrives at the aligning marks at a speed appropriate therefore.
  • the next sheet in sequence should be located as close to the alignment markers as possible when the preceding aligned sheet has vacated the markers, for example to obtain smooth operation in stream-fed apparatus with which the sheets slide forward in a continuous stream in overlapping relationship.
  • the sheets are aligned with the markers, the square, clean-cut leading edge of the sheet and one side edge thereof being moved into abutment therewith.
  • the most conventional method in this respect is the socalled three-point alignment method which employs two front markers and a side marker.
  • the front markers may be mounted on the undersurface of the table in a manner to permit them to be lifted up or to be lowered when the sheet is to be engaged by gripping means on the passing cylinder.
  • Modern paper sheet feed apparatus are also normally provided with automatic stop means comprising signal means and activating means.
  • the signal means which may be a mechanical detecting probe, an electric slide contact, a photocell or a microswitch, is constructed to send a signal to the activating means in the absence of a sheet in the line or when a sheet arrives too early or is obliquely positioned in relation to the markers, or if several sheets should arrive at the markers simultaneously.
  • the activating means may be operated mechanicaly or electromagnetically and are normally arranged to stop the feed apparatus and printing in the printing press.
  • the photocell In the case of photoelectric signalling means, the photocell is normally placed in plane with the front stop, the speed of the paper sheet normally being retarded before the sheet reaches the stop. If sheet speed retarding hooks and underlying front hold-back means are used, there is a risk that the sheet will lie over the retarding hooks and enter the machine at the wrong point of time.
  • the present invention relates to a method and an arrangement for controlling the alignment of a paper sheet in a feed apparatus of a paper processing or treatment machine having front alignment markers, sheet speed retarding hooks and means for detecting the position of the paper sheet photoelectrically, characterized in that the photocell of the photoelectric sensing means is arranged on the underside of the sheet speed retarding hook, that a hole is disposed through the sheet retarding hook, and that the signal transmitted by the photocell is produced when the paper sheet occupies its correct position in the sheet retarding hook.
  • FIG. 1 illustrates a sheet speed retarding hook occupying a neutral position and engaging a paper sheet
  • FIG. 2 illustrates the sheet retarding means when delivering the sheet to a front hook
  • FIG. 3 illustrates the paper sheet retarding hook subsequent to said hook having passed the front hooks.
  • FIG. 1 illustrates a feed table 1 on which is positioned a paper sheet 2 engaged by a paper sheet retarding hook 3.
  • the hook 3 has an upper, curved portion 4 and is arranged to co-act with a securely connected underlying photocell 5 with a light inlet 6 and a lamp 7.
  • a recess 8 Arranged in the paper sheet retarding hook is a recess 8 having an oblique, rearwardly extending surface 9.
  • the paper sheet retarding hook 3, together with the photocell 5, moves along a path 10 in an upper position towards a front hook 12 which is pivotally mounted about a pivot point 13.
  • the hook 3 continues past the front hook 12 whereafter it is lowered beneath the surface of the table 1 and passes back along the lower part of its movement path, whereafter it is lifted above the surface of the table to the neutral position, ready to receive the next paper sheet.
  • the hole 8 When the paper sheet passes into the hook, the hole 8 is partially covered by the front edge 11 of the paper sheet.
  • the hole is free, light from the lamp 7 is reflected away from the photocell by the oblique surface 9 but when a sheet enters the hook, the light is reflected against the surface of the paper into the light inlet 6 of the photocell and a signal is produced.
  • a wrongly aligned paper sheet is illustrated in FIG. 1 by dash lines, the front edge surface 11 of the sheet being located above the upper portion 4 of the hook. In this instance, the light from the lamp is reflected by the oblique surface 9 and not by the paper.
  • the photocell should be so sensitive as to allow a signal to be obtained also in the case of coloured paper or paper carrying black print.
  • the photocell and the paper sheet regarding hook move forward and deliver the paper sheet to the front hook.
  • the position of the sheet is constantly checked by the photocell, so that if the paper sheet is drawn to an oblique position the signal will cease.
  • the control signal from the photocell is connected to the paper feed means in a manner to cause said means to stop immediately when the signal is interrupted. Since the stop directly activates the paper feed, only small masses are affected, and hence paper feed can be stopped immediately, e.g. to prevent a paper sheet from entering the press wrongly aligned. Secondly, the pressure between the rolls is removed, and
  • FIG. 2 illustrates how the paper sheet has stopped against the front hook 12
  • FIG. 3 illustrates how the paper sheet retarding hook 3 has continued beyond the front hook 12 to be lowered while moving down beneath the surface of the table.
  • the paper sheet retarding hooks when occupying their neutral position, are positioned at such a distance upstream of the front hooks that the path travelled by the paper sheet between said hooks corresponds in time to approximately a third of a revolution of the cylinder, although this distance may naturally be varied depending on the type of press being used and the work carried out thereby.
  • At least one movable paper sheet retarding hook having a J-shaped configuration defining a paper receiving slot
  • said photoelectric means being fixedly secured to the underside of the paper sheet retarding hook and movable therewith;
  • said hook having an opening communicating with said slot and said photoelectric means producing a signal responsive to the light reflected from the paper when it arrives in the retarding hook slot in the correct position.
  • said photoelectric means comprises a holder containing a photocell and a lamp for producing the signal in the photocell;
  • said holder having an outlet for passing light from the lamp toward said hook and having an inlet for passing light reflected from the paper sheet toward said photocell;
  • the light from the lamp being reflected from the paper sheet and passing through said inlet when the paper sheet is correctly positioned within said slot;
  • the upper portion of the paper sheet retarding hook having an obliquely and downwardly extending surface forming the base of said opening and arranged to reflect light passing through said outlet away from said inlet in the absence of a paper sheet in the paper retarding hook receiving slot.
  • a method of checking the alignment of a paper sheet feed apparatus for feeding sheets of paper at high speeds in a paper processing machine comprising the steps of:
  • retarding member having a hook-shaped projection positioned in the path of movement of said paper sheet, said hookshaped projection having an opening;

Landscapes

  • Registering Or Overturning Sheets (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
US00292720A 1971-10-05 1972-09-27 Method and arrangement for checking the alignment of a paper sheet in paper sheet feed apparatus Expired - Lifetime US3829702A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE12595/71A SE360839B (it) 1971-10-05 1971-10-05

Publications (1)

Publication Number Publication Date
US3829702A true US3829702A (en) 1974-08-13

Family

ID=20296003

Family Applications (1)

Application Number Title Priority Date Filing Date
US00292720A Expired - Lifetime US3829702A (en) 1971-10-05 1972-09-27 Method and arrangement for checking the alignment of a paper sheet in paper sheet feed apparatus

Country Status (7)

Country Link
US (1) US3829702A (it)
JP (1) JPS517408B2 (it)
DE (1) DE2247532C2 (it)
FR (1) FR2155578A5 (it)
GB (1) GB1372128A (it)
IT (1) IT968156B (it)
SE (1) SE360839B (it)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953020A (en) * 1975-01-27 1976-04-27 St. Regis Paper Company Bag aligner machine
US4354673A (en) * 1979-12-20 1982-10-19 Komori Printing Machinery Co., Ltd. Inadequately fed sheet detectors for use in sheet-fed press
US4805893A (en) * 1987-11-24 1989-02-21 Komori Printing Machinery Co., Ltd. Abnormal-paper sensing apparatus in a printing machine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE62889T1 (de) * 1987-11-24 1991-05-15 Komori Printing Mach Vorrichtung zum detektieren von fehlerhaften boegen in druckmaschinen.
DE102007009676A1 (de) * 2007-02-28 2008-09-04 Koenig & Bauer Aktiengesellschaft Vorrichtung zum Ausrichten eines Bogens auf dem Anlagetisch einer Bogendruckmaschine
JP2014005144A (ja) * 2012-05-30 2014-01-16 Ricoh Co Ltd 用紙後処理装置及び画像形成装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1102183B (de) * 1957-07-08 1961-03-16 Headley Townsend Backhouse Blattzufuehreinrichtung
DE1210013B (de) * 1965-06-30 1966-02-03 Roland Offsetmaschf Kontrollvorrichtung an bogenverarbeitenden Maschinen
DE1611323A1 (de) * 1968-02-10 1970-12-10 Polygraph Leipzig Verfahren und Vorrichtung zum passgerechten Zufuehren von Bogen fuer bogenverarbeitende und -bearbeitende Maschinen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953020A (en) * 1975-01-27 1976-04-27 St. Regis Paper Company Bag aligner machine
US4354673A (en) * 1979-12-20 1982-10-19 Komori Printing Machinery Co., Ltd. Inadequately fed sheet detectors for use in sheet-fed press
US4805893A (en) * 1987-11-24 1989-02-21 Komori Printing Machinery Co., Ltd. Abnormal-paper sensing apparatus in a printing machine

Also Published As

Publication number Publication date
DE2247532C2 (de) 1983-06-01
JPS517408B2 (it) 1976-03-08
GB1372128A (en) 1974-10-30
DE2247532A1 (de) 1973-04-12
SE360839B (it) 1973-10-08
IT968156B (it) 1974-03-20
JPS4845310A (it) 1973-06-28
FR2155578A5 (it) 1973-05-18

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