FR2491831A1 - METHOD FOR ASSEMBLING BOOKS OF FOLDED SUBSTRATES FROM TWO COMPONENTS OF ELECTRICALLY INSULATING SHEETS, PARTICULARLY FOR THE MANUFACTURE OF PRINTED PUBLICATIONS - Google Patents

Abstract

TO FORM STABLE STACKS OF SHEETS FROM STRIPS OF PAPER PREVIOUSLY PRINTED IN A ROTARY, DIVIDED BY A LONGITUDINAL SLITTING DEVICE AND MUTUALLY COVERED BY AN ASSEMBLY DEVICE 2, 2 THE STRIPS ARE CHARGED WITH ELECTRICITY OF ELECTRODES 7, 7 ARRANGED CROSS -ALLY, AFTER THE FORMATION OF A MULTI-LAYER BUNDLE 4. THE LOAD IS ON THE BANDS CLOSELY APPLIED TO ONE AGAINST THE OTHERS. THE ELECTROSTATIC CHARGE, IN WHICH OPPOSED CHARGES ARE DEPOSITED ON THE EXTERIOR BANDS 1D, 1H OF BUNDLE 4 KEEP THE SHEETS PROPERLY ASSEMBLED IN BATTERIES, ESPECIALLY DURING THE CROSS-FOLDING OF THE BATTERIES FOR THE FORMATION OF BOOKS 17, OR 'ASSEMBLY OF THESE NOTEBOOKS INTO PRINTED MULTIPAGE PRODUCTS.

Description

249 1831

  For assembling the printed sheets of the illus-

  very, brochures with a large number of pages, or public

  equivalent cations printed in printing presses

  rotary, the printed paper strips coming from the press-

  se and the longitudinal cutting machine are brought together by means of change of direction, for example

  turning bars and with a pre-

  determined, in a continuous multi-layer bundle in the-

  which successive pages of the printed product are arranged

  one next to the other. This multi-layered bundle

  ples then passes through a first pair of rolls of ser-

  rabies which significantly compress the strips of paper together

  against the others and then to a second pair of rou-

  clamping waters by which the bundle is pulled under tension

  of the first pair of clamping rollers. This link

  due then crosses a longitudinal cutting device provided

  a rotary cutting device by which the bundle is di-

  referred to in individual packs of sheets of a length or

  predetermined size of printed sheets; roughly equal

  double the page width of the printed product. These individual packets of sheets then arrive in a receiving or assembling cylinder in which the packets are temporarily stored. Leaving the receiving or assembling cylinder, the packets of sheets are sent to a folder in which they are folded transversely (folded in half) to the size of single pages, the printed pages arranged face to face in an extreme internal position in the package. of folded sheets being formed by the outer surface of the strip of the multi-layered bundle which is most

close to the fold.

  Notebooks or booklets from the same press

  immediately transferred by means of a conveyor belt

  teuse, on which they are superimposed in scales, to a

  stacking mechanism in which they are temporarily stored

  usually, superimposed, for example on pallets. Notebooks with other pages of the printed product are likewise temporarily stored, for example on pallets, until, finally, the notebooks of the printed product

  are assembled in the finishing workshop, in a

  tif removal of packages. This device can be, for example a rotary conveyor in which horizontal load-bearing elements in the form of "swords" are guided between belts. The notebooks that are to be superimposed and which are composed of successive pages placed in order going from the inside to the outside in the printed product are placed one after the other straddling the swords in the finishing workshop, either by hand or using

  mechanical conveying devices, in an as-

  semblance by placing itself in the desired order of succession. The en

  lifting of the notebooks of the swords of the device for depositing

  notebooks occurs either by hand or here also a-

  of automatic pliers. The stacks of notebooks that contain-

  Thus, in a desired order of succession, all the pages of the printed product are then routed, either by hand or by means of a gripping device, to a stapler to be assembled into a brochure formed by a stack of notebooks. Finally the brochure is still cropped out of three

listed in a single transaction.

  So that the notebooks produced by the folder can-

  feels to arrive without incident to the swords of the device for removing the notebooks and there, can be assembled in a stack of notebooks, it is necessary to open the notebooks beforehand

  that is to say to reshape the V printed sheets sim-

  fully folded, which are applied against each other, so that they can be placed without difficulty on the corresponding sword. This can only happen properly,

  when, on the one hand, the halves of the inner inner sheet

  me of the notebook have a clear tendency to separation, the half-sheets moving away more and more from each other towards the outside and that, on the other hand, the printed sheets of the notebook do not spread in a fan , because, in this case,

  the keeping of printed sheets would no longer be guaranteed.

  The object of the invention is therefore to propose a process

  thimble to assemble notebooks to a fold, made of sheets in a material insulating substrate of electricity and under the effect of which, on the one hand the tendency to the separation of the inner half-sheets extreme of the notebook is determined

  positively and, on the other hand, all the material sheets-

  substrate of the notebook remain temporarily in support

  on the others. Another object of the invention consists in applying

  quer the process in combination with a rotary printing press, to assemble notebooks from stacks of sheets. According to the invention, this problem is solved by a method for assembling notebooks of sheet-shaped, electrically insulating substrates, stacked in several layers, which are folded in half along a fold line situated approximately in the middle. of the length of the substrates, characterized

  in that before folding, temporary assemblies are kept

  in a packet, by electrostatic effect, the sheets of the stack of substrates, by depositing an electrostatic charge on the substrates which are outside the two

  sides of the package, the piles of supplies are sent to a folder

  trats assembled electrostatically, by means of a collecting and routing device, to fold these stacks of sheets into two half-stacks having practically the same dimensions, to form a notebook in which, on the internal face, two half sheets charged with static electricity of the same sign are arranged one opposite the other, The method described above can be advantageously applied for the

  implementation of the process comprising a rotary printing press

  primerie, in which printed strips of paper leaving at least one printing unit are divided into elementary strips of paper after having passed through cutting means

  of the tape and routed by means of change of di-

  rection to an assembly device to form a bundle

  continuous with multiple layers, the strips of this bundle are brought into close mutual contact by means of a

  clamping which acts on both sides on the outer bands

  This clamping device comprising a first pair of clamping rollers and a second pair of clamping rollers placed at a distance in the direction of travel of the continuous multi-layer bundle in the machine, this

  last pair attacking the multi-layer bundle by exercising

  cutting a tension on this bundle to extract it from the press, characterized in that the electrostatic charge is deposited on the extreme outer elementary strips of the bundle with multiple layers, by a set of high-voltage electrodes disposed transversely to the bundle in the area of action of the clamping device, and in that, after having passed through the second pair of clamping rollers, the multi-layer bundle is divided into separate stacks of

  sheets without appreciable reduction of the electrostatic charge.

  The advantages of the characteristics according to the invention consist in that, for example the individual packages of

  sheets cut from the continuous bundle of bedding substrate

  multiple things can be folded in half so

  that the notebooks resulting from this operation remain spontaneous-

  open in V at least for a reasonable time, notably

  until its next treatment, under the effect of

  sion of charges of the same sign, which results from the elective charge

  trostatic which manifests itself between the extreme sheets ex-

  sides of the package, and in such a way that the different sheets of the notebook remain applied against each other until the load is gone or cleared. In the case of

  notebooks of printed sheets of the kind mentioned at the beginning, the disappear-

  rition or the total compensation of the load occurs at the latest when, after the assembly of a printed product composed from several separate packages, this product has passed into an external contact zone which short-circuits

  load potentials. Whenever another notebook or-

  green in V is deposited on an underlying notebook, the potentials opposite them come into contact so that a stable assembly of the sheets is obtained even when there is a gradual natural flow of the charge towards the environment-

  favored by the humidity of the ambient air.

  Other characteristics of the invention will appear

  during the description which follows. In the accompanying drawings,

  given only as an example, - Fig. 1 is a schematic representation of a

  device for carrying out grouping and electrical bonding

  trostatic of strips of paper and for the division of a multi-layered bundle into stacks of separate sheets; - Fig. 2 is a block diagram of an embodiment of the electrodes of FIG. 1; - Figs. 3A and 3B respectively show an individual stack of sheets (A) cut to length, in the state it presents before it enters the collecting cylinder and this stack of sheets after its transformation into a notebook (B) in the folding; - Fig. 4 schematically shows the assembly of a number of different notebooks on a conveyor

  horizontal circular fitted with load-bearing elements

  swap, the broaching of the assembled notebooks and the elimination of

  residual charge on the external face of the finished product.

  In Fig. 1, we have designated by the references la to lh several (for example eight) strips of paper printed on one side or on both sides, which are routed, coming from the printing unit and from the longitudinal section of a rotary press printing works, or printing or longitudinal cutting groups of several rotary presses, possibly

  by means of diversion such as bars

  turnaround res, etc, each with a 2.2 'change of direction roller to a group of assembly rollers. The

  prints carried by the paper strips la at lh are found

  wind already, at the time of the arrival of these bands on the roads

  2, 2 'correspondents of the group of assembly rollers

  in the relative assembly positions that the pages suc-

  cessives must occupy in the finished printed product. The strips of finished paper which, on leaving the group of rollers

  assemblers are still in mutual contact without tightening,

  now come between two clamping rollers 3, 3 by which they are brought into close mutual contact and thus form a continuous bundle with several layers 4 which, in the course of its path, passes through a second pair of clamping rollers 5, 5. The second pair of clamping rollers 5, is constituted by a pair of pulling rollers driven by a motor and by friction on the external bands ld and lh, the rollers pass all the bands la to lh

  through the processing stages located upstream (not shown

  felt). As a result, the second pair of clamping rollers, 5 exerts a considerable drawing effect on the different paper strips of the continuous multi-layer bundle 4

  and guarantees that all strips of paper la to lh will be stretched

due and smooth.

  Between the two pairs of clamping rollers 3, 3 and, 5 is mounted a set of charging electrodes 6 which extend

  extends over the entire width of the bundle 4 and which, in the re-

  presentation of FIG. 1, includes two ionization electrodes

  identical 7, 7 '. These electrodes are connected by the in-

  power supply conductors 8, 8 'at the output terminals of a high voltage direct current source (not

  shown). The ionization electrodes 7, 7 'are preferably

  of known electrostatic devices, in which separate electrodes which have a conical shape and terminate in a sharp point, are supplied

  by a common contact strip and mounted in posi-

  relative alignment and spacing exactly defined

  nies. The contact strip supplying the point electrodes

  te, which is connected to the direct current source by the con-

  supply ducts 8, 8 'mentioned above is covered with a rigid casing in the form of a bar, made of an insulating material which at the same time serves as a support for the bar

  of contact. The ionization electrodes 7, 7 'are used to

  apply to the outer strips ld and lh of the continuous bundle

  electrostatic charges of opposite signs. The purpose of this-

  The characteristic is explained below.

  It goes without saying that by replacing electrical appliances

  trostatic electrodes with the aforementioned points, it is also possible to

  use groups of charge electrodes with

  wires or bars of any cross-section and a configuration

  any electrode. Replacing the provision

  isolated from the two ionization electrodes 7, 7 ', it can also

  be advantageous, for safety or service reasons

  vice, to put a pole of the direct current source and, consequently, also the corresponding electrode to earth. This arrangement is shown in FIG. 2. In this

  In this case, the earthed electrode 9 is preferably made up of

  killed by a metal profile having a proper rigidity

  propriée or an electrode strip mounted on a carrier element. The insulated electrode 10 is advantageously an electrostatic device with point electrodes of the kind described above, or a wire or rod electrode. The connection of the insulated electrode can be made either on the plus pole or on the minus pole of the direct current source while

  that the opposite pole is connected to earth.

  In the case of the use of two iso-

  may need to be polarized

  preferred electrode which possibly depends on the cons-

  translation of the printing press or its mode of operation-

  ment. The sets of electrodes of the kind shown in Figs. 1 and 2 can be easily mounted both during the construction of the press and subsequently,

  because these devices require only little space. Being given

  born that, moreover, they can be mounted in a point of the pass-

  wise paper in the machine which is easily visible,

  at least when setting the machine and in most

  apart from cases during the operation of the machine and that, moreover, these devices require only reduced maintenance, it is generally not necessary to provide

  special arrangements for mounting.

  Under the effect of the application of electrostatic charges

  ticks of different polarities on the external surfaces of the continuous bundle 4 with multiple layers, there is a compression effect on the strips of paper included between these external faces by virtue of which the strips of the bundle are kept assembled at least for the time in which

  the production of the printed product can be carried out normally.

  In this way, it is possible to cut out from the continuous bundle 4 stacks or individual packs of sheets in

  each of which is kept spontaneously assembled

  nement. This cutting is advantageously carried out by means of a

  no rotary shears with blades 11, 11 'which execute on the lias-

  continues 4 continuous cuts 12 at intervals of

  finished. The stacks of sheets 13 thus arrive at a receiving cylinder -or collector 14, the construction and mode of operation of which are known, followed by a

  transfer device 15 of the usual type used for transferring

  refer the stacks of sheets to a folder 16 also of known type. Thanks to the electrostatic link which unites

  the different sheets of a stack of sheets, these sheets

  lets adhere so strongly to each other that there is

  there is no risk of the batteries running out.

  The stacks of leaflets 13 which enter the cy-

  liner receiver and collector 14, and which can be pola-

  ridges, for example as shown in FIG. 3A, are then placed in roof tiles and this arrangement puts

  in contact with each other charge polarities of sign

  milking bundles of slips. Since, in practice, the charge potentials are of the same value, there is practically no flow of the charge. In folder 16, we form from these stacks or packages, by folding

  transversal, notebooks or booklets 17 like the one shown

  felt in FIG. 3B, forming two halves presenting

  practically equal dimensions. In this operation, the seg-

  The strip of paper which is inside on the side of the fold is folded back on itself in two halves. Since these two halves of the sheet segment have the same polarity (the negative polarity in the case shown on the

  Fig. 3A and 3B), the sheets of notebook 17 tend to open

  live. Since, on the other hand, the external faces of the notebook 17 have the same potential, which is opposite to that of the internal face of the notebook, the notebooks which come out of the folder 16 stacked on a conveyor belt 19 tend

  to repel each other so that they have to be hand-

  held flat by pressure means 18, which can be constituted for example by rollers mounted on pendulum supports.

  Thanks to the ease, resulting from the electro-

  static, with which we can separate the notebooks 17 that come out of the folder 16 on the conveyor belt 19 in the direction of the arrow 20 (Fig.l), we get an improvement

  considerable production capacity of the operation of-

  semblage proper, known per se, shown diagrammatically

  only in Fig. 4, which takes place on notebooks 17 which follow one another from the inside to the outside in the finished printed product. A description of this operation will be given below

  assembly, only to bring out the advantages

  ges of the process according to the invention.

  Fig. 4 shows in its upper part three ban-

  conveyors 19.1, 19.2, 19.n which correspond to the conveyor belt 19 of FIG. 1, on which notebooks 17 pressed by folding elements 18 are transmitted in the direction of the arrow to stacking devices 21.1, 21.2,

  21.n. In finishing workshops that are not fully automatic

  sés, the stacking devices 21.1 to 21.n consist of trays, for example mounted on pallets, from which the notebooks 17 which contain the different pages of the printout are delivered, in most cases to the hand to the assembly

  bleuse designated as a whole by the reference 22.

  The stacking devices 21.1 to 21.n are associated

  ciés in a known manner of the separation devices of the notebooks and the conveying means 23.1 to 23.n shown

  schematically, which work in synchronism with the movement

  advance of a device 26 for depositing packets

  presented by a partially developed view. This device can consist of a circular conveyor in which horizontal load-bearing elements, or "swords", 24.1 to 24.n are mounted on belts 25. In the representation of FIG. 4, we omitted to represent the details which are not

  not necessary for the presentation of the advantages of the invention.

  The swords 24.1 to 24.n of the device 26 for depositing the packages are animated with coordinated movements so that they

  successively reach places in the assembled machine

  bleuse 22 which are determined according to the working mode

  stacking devices 21.1 to 21.n and to trans-

  porters 23.1 to 23.n organized like posts.

  At the latest where the empty sword 24.0 is located, a complete bundle of notebooks must be removed, either by hand or by mechanical means. During the next step of the movement, this sword which is now free arrives at the place where the sword is designated by the reference 24.1. This sword then receives from the transporting orbane 23.1 the first

  notebook 17.1 with the extreme interior pages of the pro-

  duit printed. The repulsion effect of the identical polarities of the electrostatic charge carried by the extreme inner sheet of the package has the consequence that the pages of the notebook placed in V are separated from each other so that it is possible to pose correctly the notebook there on the sword which was previously still free. In this operation, the different sheets of the notebook continue to

  adhere to each other so that the diffi-

  cultivation which would result from the spreading of the ends of the sheets. The next step of the movement then brings the sword to the place where it is designated by the reference 24.2 and, there, it receives from the transporting member 23.2 the second notebook

  17.2 which, thanks to the spacing of its sheets, can again

  calf to land without difficulty riding on the first notebook

  17.1. The process repeats itself with each step of the movement until

  that all the notebooks of the printed product to be produced

  are placed on top of each other. Naturally, the assembly

  bleuse includes items 21.1 to 21.n, 23.1 to 23.n in number

  equal to the number of notebooks 17.1 to 17.n to be assembled. By ail-

  their, it goes without saying that in replacing notebooks of the kind described in Figs. 1, 2 and 3, it is also possible to introduce into a collator 22 separate sheets made of a material different from that of the sheets of the notebooks and which are not

  cannot or cannot be charged with static electricity.

  Leaving from the post where the extreme outside notebook

  of the finished printed product has been placed, the stack of notebooks 27

  posed in inverted V is brought automatically in the direction of

  arrows 28, 29, to a broaching and trimming machine 30.

  In this machine notebooks 17.1 to 17.n are assembled in

  a brochure with staples and trimmed on three sides. Fina-

  Also, the printed products that are now finished are

  routed, on a conveyor belt 31, for example to the ma-

  shipping gasin. The harmful residual charge which may possibly still be present on the printed product can be dissipated by an earthed discharge device 32.

Claims (3)

  l - Method for assembling notebooks of substrates   sheet-shaped, electrically insulating, stacked more   layers, which are folded in half along a fold line located approximately in the middle of the length of the   trats, characterized in that before folding, it is maintained as-   appeared temporarily in a package, by electrostatic effect, the sheets of the stack of substrates, by depositing an electrostatic charge on the substrates (ld, lh) which are   the outside on both sides of the package, we route to a pile   (16) the stacks of electrostatically assembled substrates (13), by means of a collecting device (14) - and of routing (15), for folding these stacks of sheets into two half-stacks having practically the same dimensions, to form a notebook (17) in which, on the internal face, two half-sheets charged with static electricity of the same sign   are arranged one opposite the other.   2 - Installation for the implementation of the method according to claim 1, comprising a rotary printing press, in which bands of printed paper leaving at least one printing group are divided into elementary bands of paper after passing through means   cutting tape and routed by exchange means-   direction to an assembling device (2, 2t) to form   sea a continuous bundle with multiple layers, the strips of this bundle (4) are brought into close mutual contact by means of a clamping device (3, 5) which acts on both sides on   the outer bands (id, lh), this tightening device   taking a first pair of clamping rollers (3) and a second pair of clamping rollers (5) placed at a distance   in the direction of travel of the continuous multi-layer bundle   multiple (4) in the machine, this last pair attacking the multi-layer bundle (4) by exerting a tension on this bundle to extract it from the press, characterized in that   that the electrostatic charge is deposited on the electrical strips   outer outer (ld, lh) of the multi-layer bundle, by a set of high-voltage electrodes (7,7 ')   arranged transversely to the bundle (4) in the access zone   tion of the clamping device (3, 5), and in that, after passing through the second pair of clamping rollers (5), the multi-layer bundle is divided into separate stacks   sheets (13) without appreciable reduction in the electro- charge static.   3 - Installation according to claim 2, charac-   characterized in that the set of high-voltage electrodes (7, 7 ') is arranged between the first pair of clamping rollers (3) and the second pair of clamping rollers (5), and in that at minus the part (7) of the electrode assembly   high voltage located on one side of the multi-layered bundle   ples (4) constitutes an ionization electrode furnished with a point your separate.