FR2529831A1 - FOLDING APPARATUS FOR PRINTING MACHINES - Google Patents

Abstract

A. APPARATUS INCLUDING ONE LONGITUDINAL BENDING DEVICE AND TWO CROSS-BENDING DEVICES. B. CHARACTERIZED IN THAT BETWEEN THE FIRST AND THE SECOND CROSS-BENDING DEVICES, FOR THE TRANSFER OF THE CROSS-FOLDED COPIES A FIRST TIME, IS PROVIDED FOR A BELT TRANSPORT DEVICE CONSTITUTED BY A BAND UPPER GUIDANCE 6 ENCLOSING THE PARTIAL ENCLOSURE OF THE CYLINDER WITH FOLDING JAWS 2 AS WELL AS A LOWER GUIDANCE WITH BANDS 9 PARTIALLY SURROUNDING THE ENCLOSURE OF THE CYLINDER WITH FOLDING KNIVES AND CLAWS 4, WHILE, IN RELATION TO THIS LOWER GUIDANCE WITH BANDS 9, A RACLEOR 12 IS MOUNTED ON THE BENDING JAW CYLINDER 3 OF THE FIRST CROSS-BENDING DEVICE. C. APPARATUS APPLICABLE TO PRINTING MACHINES.

Description

Folding machine for printing machines

  The invention relates to a folding apparatus

  carrying a longitudinal folding device and two transverse folding devices placed in succession, this apparatus being able to be used particularly advantageously for rotary machines with fast walking

  to print newspapers as well as books and brochures.

  Folders are known with two transverse folding devices arranged one behind the other, in which the first transverse folding device is constituted by a folding knife cylinder provided with points or claws and a jaw cylinder of folding, while the second transverse folding device is constituted by a cylinder with folding knives and claws, and a jaw cylinder

folding.

  These special folding devices have the advantage of allowing a favorable realization from the point of view of space with good accessibility by the service personnel.

  first transverse folding device

  qué, not very fragile and functioning, which is in

  able to provide for a first folding the products of im-

  primerie, even for the maximum printing speed of

  rotary machines to print newspapers.

  With these folding devices one can also

  meet the wishes of many printing companies

  a periodically folded newspaper twice

  headline of this periodical placed outside.

  The essential disadvantage of these folding apparatus, which is particularly apparent in the case of rapidly rotating rotary printing machines, is the second transverse folding device whose

  possible folding speed is at a noticeable level

  lower than that of the first transverse folding device, so that printed products to fold twice transversely can be achieved only by reducing the printing speed. The reason is

  in the cam command of the tongs available

  on the cylinder with folding knives and tongs,

  which, during the rotation of the cylinder, at the moment of the

  the most favorable situation between the folded back of the product

  print, held by the folding jaws on the cy-

  folding jaw liner of the first transvarsal folding device, and the folding knife cylinder with tongs of the second transverse folding device, seize the printing product under consideration and must

  to take care of folding bins or-

  at the same time For this purpose, the opening angle

  pliers must be very important and the angle of

  Due to the unfavorable geometrical conditions, it must be kept very small, so that for very low bending speeds, very high acceleration values and inertia forces occur, which are difficult to control when the rotational speed In addition, the printed products to be seized are damaged by claws as soon as they are

  slightly offset from their basic position.

  The object of the invention is to modify, while maintaining these advantages, the folding apparatus mentioned in the state of the art, so that, without

  reducing the speed of printing possible

  tative, folding can be done by all

positive folding.

  The invention proposes to create a folding apparatus for a rotary newspaper printing machine of the type which, following the longitudinal folding device, comprises a first transverse folding device with a folding knife cylinder equipped with spikes or of claws and a cylinder with folding jaws, the device

  also comprising a second transverse folding device

  versal constituted by a cylinder with folding knives and

  with claws and a cylinder with folding jaws.

  The transfer of folded printed trans-

  versally a first time, from the cylinder to

  folding jaws of the first transverse folding device

  Versal, to the cylinder with folding knives and claws must be modified in such a way that, for the displacement

  functional claws, control cams more

  may be used, so that a reduction in the speed of the second transverse folding device is not necessary, and that a safe and damage-free transfer of printed products transversely folded a first time is ensured by the

  claws of the cylinder with folding knives and claws.

  According to the invention, this problem is

  resolved that between the first and the second

  transverse folding devices is arranged a device

  conveyor belt, to transfer the im-

  award winners folded transversely for the first time

  positive conveyor belt consists of a belt upper guide partially surrounding the envelope surface of the folding jaw cylinder of the first transverse folding device and a band circulation surface is formed by the envelope of the folding knife cylinder and claws, as well as a lower guide with bands partially surrounding the envelope surface of the cylinder with folding knives and claws A scraper member, in operative connection with this lower guide, is mounted on the cylinder to

  folding jaws of the first transverse folding device

versal.

  From this solution results the advantage that the grif-

  of the cylinder with folding knives and claws

  need to take charge, directly, in cooperation with

  the first transverse folding device, the printed products folded transversely a first time at the time of the most favorable geometrical position of the

  cylinders, but that, on the contrary, these claws have now

  time to support printed products

  brought by means of the scraper organ of the

  conveyor belt on the entire part of the envelope surface of the folding knife cylinder and

  with claws surrounded by the lower band guide.

  It follows for the functional displacement of

  claws, much better conditions, so that

  now a larger control angle and a race

  smaller cam-correlated with ac-

  much lower celeration, are achievable Because the envelope surface of the cylinder with folding knives and claws serves at the same time as a circulation surface

  for the upper belt guidance, a particular feed

  In this context, the fact that the upper band guide partially surrounds the jaw cylinder

  folding of the first transverse folding device

  This is a positive step, by ensuring that more products are printed from this cylinder to the cylinder with folding and grinding knives.

following.

  Embodiment of the invention The invention is explained hereinafter with reference

  to an exemplary embodiment shown in the FIG.

  attached that represents a side elevation view

  schematic of the folding apparatus, according to the invention.

  tion. The folding apparatus consists of a first longitudinal folding device which, in the example shown, is a folding funnel 1, a first transversal folding device with a folding knife cylinder 2 and a folding cylinder. folding jaws 3, as well as a second transverse folding device with a cylinder with folding knives and 3 claws 4 and

  a cylinder with folding jaws 5.

  Between the two transverse folding devices there is provided a belt conveyor. It is constituted by an upper band guide 6, which partially surrounds the envelope surface of the folding jaw cylinder 3 and whose strips 7 are guided by the

  8 and the surface area of the cylinder of

  bending and claw buckles 4, as well as inferior guidance

  9 which partially surrounds the bending and claw knife cylinder 4 and whose belts 10

are guided by the rollers 11.

  On the jaw cylinder 3 fold, lies

  a scraping organ 12 th In exem Die of realization repre-

  Furthermore, although not forming part of the invention, the strip conveyor 14 leading to the impeller 13 and the cylinder

cutting 15.

  During the folding process, the paper web is guided over the folding funnel 1 by which it is then folded longitudinally.

  folded, fed by means of feed cylinders

  The cutting cylinder 2 and the cutting cylinder 15 are cut by this cutting cylinder 15 to the length of the copies. Each of the printed documents thus cut is grasped by the tips of the folding knife cylinder 2 and is transported on the envelope surface of this cylinder until the first transverse folding is achieved by insertion of a folding knife of the folding knife cylinder 2 into a folding jaw of the folding jaw cylinder 3

placed next.

  The transversely folded printed product is gripped by the folding jaws of the folding jaw cylinder 3 at the same time as the tips of the cylinder 2 are retracted, and it is transported on this cylinder 3,

  after a rotation of about 1200 according to the example

  felt under the upper guide with 6 driven strips.

  It continues to be transported between this upper guide and the jaw cylinder, until it is held back by the scraper 12 of the cylinder casing after prior opening of the folding jaws It then reaches between the guide upper band 6 and the lower guide strips 9, the cylinder with folding knives and claws 4 partially surrounded by this

lower belt guidance.

  This printed product is seized, in the part of the envelope surface surrounded by the strips 10, by the claws of the folding knife and claw cylinder 4 and is transported, applied C on the envelope of this

  until it reapplies the second trans-

  versal between the cylinders of the second folding device

  transverse, by a folding knife of the cylinder with

  folds and claws 4, and in cooperation with

  With a pair of jaws of the folding jaw cylinder 5, then gripped by the same pair of folding jaws, in cooperation with other moving elements such as claws, folding knives, etc. and being applied to the envelope surface. of the jaw cylinder 5, it is brought, in the case of the exemplary embodiment shown, to a conveyor device with strips 14 and from there to a paddle wheel 13

stacking of printed products.

Claims (1)

R E V E N D I C A T IO N S   1) Folding apparatus comprising a device for   longitudinal folding, a first transverse folding device   blade formed by a knife cylinder with points or claws, and a cylinder with folding jaws, and a second transverse folding device consisting of a cylinder with folding and claw knives and a jaw cylinder of folding device characterized in that between the first and second folding devices   transversal, for the transfer of folded copies trans-   firstly, there is provided a belt conveyor consisting of an upper band guide (6) partially surrounding the casing of the folding jaw cylinder (2) and a lower band guide (9) partially encircling the envelope of the folding knife and claw cylinder (4), whereas, in connection with this lower band guide (9), a scraper member (12) is mounted on the jaw cylinder of   folding (3) of the first transverse folding device.   20) Folding apparatus according to claim 1, characterized in that a circulation surface of the upper band guide (6) is constituted by the envelope of the   cylinder with folding knives and claws (4).