FR2509665A1 - ROTATING PRESS WITH COOLING SYSTEM - Google Patents

Abstract

THE INVENTION RELATES TO A ROTARY PRESS INCLUDING AT LEAST ONE PRINTING GROUP, A DRYER DEVICE 6 SUCCESSING THE LAST PRINTER GROUP AND A COOLING SYSTEM 7 WITH SEVERAL COOLING ROLLS. AT LEAST TWO OF THE COOLING ROLLERS 9, 10 MAY BE BROUGHT INTO CONTACT WITH ONE ANOTHER AND THUS ACT AS CALENDERING ROLLERS, AND A PATH LENGTH COMPENSATION DEVICE 12, 13 IS ADDED TO THE COOLING SYSTEM 7, DEVICE WHICH HAS THE FUNCTION OF COMPENSATING THE DIFFERENCES WHICH MAY OCCUR IN THE TRAVEL LENGTHS OF BELT 2 WHEN CLUTCHING AND DISENGAGING THE COOLING ROLLERS 9, 10.

Description

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  The present invention relates to a rotary press

  carrying at least one printing unit for printing a carrier tape, a dryer device mounted after the last printing unit and a cooling system mounted after the dryer device and provided with a plurality of cooling rollers

  around each of which passes the print media strip.

  By the instructions for the machine "ROTOMAN" of M A N -

  ROLAND, pages 14 and 15, 1976, there is known a rotary web offset press by means of which a carrier tape can be printed in several printer groups mounted in series, each time double-sided At the last printing group succeeds

  a drying plant downstream of which is mounted a.

  cooling system consisting of several cooling rollers

  dissectors on which the printing support tape is

  Presses of this type apply in the various groups of

  printers, an ink more or less covering However,

  when the support band has absorbed, due to its hydros-

  a certain degree of humidity and, during the printing

  an additional quantity of water, it can no longer

  to emerge from the areas of the surface that are heavily inked.

  This leads, during the supply of heat that takes place in the dryer device, to a curl of the printed products, the quality of which is diminished It also happens frequently,

  for certain papers, that a regular surface

  closed because, under the action of the drying device which follows the press, the fibers of the paper rise and the product

  printed matter thus takes on a relatively coarse appearance.

  It was therefore necessary to develop a press of the type

  above which the disadvantages could be eliminated

  described above without expensive additional constructions.

  The invention solves this technical problem thanks to an additional treatment in the cooling system. It relates to a rotary press of the type indicated at the very beginning of the present document, a press characterized in that at least two of the cooling rolls can be running one

  against the other, these chill rollers act as routers

  calendering lugs for calendering the carrier strip at the same time

  cooler, and the cooler system is provided with a

  course compensation which aims to compensate for

  differences in the path of the support strip when setting

  tact (clutch) and separation (disengagement) of the chill rollers. The cooling installation which follows a drying installation and which is mainly encountered in web offset presses for town works or "bilboquets" has a dual use according to the invention, which is advantageous from the point of view of the invention. On the other hand, the usual cooling rollers simply cool down the ink that has been heated in the drying plant, as well as the printing media carrying this ink.

  so that the ink is cured and thus made resistant.

  Because the chill rollers touch in accordance with the invention these serve in addition to calendering rollers

  with which the support tape passing through them is

  In this way, the curl mentioned is eliminated by this kind of ironing and the surface, roughened at the entrance, is made smooth by the measures taken in accordance with the invention without it being necessary to to resort to an expensive additional construction It

  is particularly advantageous to use four rollers

  superimposed coolers whose position of the bearings in the side wall is identical to that of the printing cylinders,

  that is to say, plate cylinders and cylinder cylinders

  blanket, in the preceding printing groups.

  to achieve an advantageous rationalization effect in the manufacture

  The invention is based on the basic principle of the invention between standardized sidewalls of this kind, which can be used both for the printing units and for the cooling system.

  according to the invention, it is possible to house in a simple manner

  silicone plicers, dialers and

  taking of the paper tape, in places preferably

my.

  The following description, with reference to the appended drawing,

  will better understand how the invention can be realized.

  In this drawing: FIG. 1 is a schematic representation of a three-color offset printing press for two-sided printing. FIG. 2 shows in detail the cooling system of the press of FIG. 1. FIG. embodiment of the cooling system, and FIG. 4 represents a third embodiment of a system

cooler according to the invention.

  The trichromatic web offset rotary press represented

  in Fig. 1 comprises an introduction system 1 from the beginning of

  a printing medium 2 passes successively through three printer groups 3, 4, 5 connected in series. In each of the printing units 3 to 5, the strip 2 can be printed on both sides in the usual manner. to cross printer groups 3 to 5 is

  After this cooling takes place in the cooling system.

  cooler 7, then, as is customary, the tape is cut in a folder 8 and the cut copies are folded.

  As shown in the detailed diagram of Fig 2, the system

  The cooler 7 placed between the dryer device 6 and the folder 8 comprises three cooling rollers 9, 10 and 11 on which the printing support strip which is to be cooled passes. According to the invention, at least two of the rollers

  chillers in the same cooling system, that is,

  that is to say, the rollers 9 and 10 of the cooling system 7 represent

  As an example, in FIG. 1, they can be brought into contact with one another so that the band 2 which passes between them

  be subjected to compression or calendering.

  chillers whose presence is usually required

  in the cooling systems fill here a dou-

  Function For the second function, that is, the

  the cooling rollers must be designed as calendering rollers so that they can be applied against each other with a corresponding contact pressure and, therefore, that the necessary pressure can be applied to the faces top and bottom of the support band

printing 2.

  Two coolers and calahrers that can

  can be brought against each other, for example 9 and 10, it is sufficient that there is one, for example 9, which can be brought,

  by adjusting means against the second cooling roll

  and calender, for example 10, which is fixed, that with the

  This is why the cooling and

  9 is eccentrically mounted. In FIG. 2, the disengaged position is represented at 9 'by a broken line while

  that in the engaged position the chill and calender roll

  dreur 9 is represented by a solid line.

  It can be seen in FIG. 2 that when the roller 9 pivots and

  move from one of the two positions to the other the length of the

  min run by the band 2 in the cooling system 7 su-

  bit a variation To prevent such a difference in

  course, resulting from the pivoting of the cooling and

  9, leads to a tear in the printing support tape.

  Sion 2 it is good to use a device called "compensator course" which is constituted, in the example shown on the

  FIG. 2, by two conductive rollers 12 and 13.

  12 may be mounted permanently while the roller

  driver 13 must be able to be moved by translation or

  With the pivoting of the conductive roller from position 13 to position 13 ', the strip 2 can, under the effect of the corresponding pivoting of the cooling and calender roll 9 passing to the position 9', take the position represented by the line 2 ' , position change that results in path length compensation so that the total length of the carrier band

  Printing 2 always remains constant.

  It is good that the displacement of the conductive roller 13 is integral with that of the cooling roll and calender 9 This is the reason why the conductive roller 13 mounted in a pivoting lever (not shown in detail in the drawing) is connected so that rigid, by a cranked lever 14,

  at the eccentric lever 15 for pivoting the cooling roll

  stenter and calender 9, the crank lever 14 and the excenter lever

  which can pivot together under the action of a piston

  for example, a hydraulic control piston 16 It is

  thus guaranteed that the pivoting of the cooler roll and

  Landreur 9 is accompanied by a corresponding pivoting of the

  the conductive water 13 for the compensation of the course.

2-509665

  FIG. 3 represents a second variant, advantageous

  In this case, contraindicating

  In accordance with the previously described embodiment, the two chill rolls of at least two pairs are applied against each other. The chill rollers 18, 19, 20 and 21 of FIG. the invention as well

  for cooling than for calendering

  It is necessary to have two cooling and calender rollers, on the one hand the rollers 18 and 19 and, on the other hand, the rollers 20 and 21, to be applied against each other. Again, it suffices that in each of the couples, only one of the two cooling and calender rollers is mounted in such a way that

  to be moved by pivoting or translation

  disseurs and calandreuri 18 and 20 are mounted eccentrically.

  The chill and calender roll 18 is pivotable under the action of an eccentric lever 22 by means of a hydraulic control piston E 23 and the chill and calender roll 20 can pivot under the action of an eccentric lever 24 by means of a hydraulic control piston 25, in other words these rollers 1 E and 20 can be applied respectively against the rollers

  coolers and calandreuls 19 and 21 which are permanently mounted.

  It is good that the pivoting amplitudes of the cooling rollers

  dissents and calandeurs 18 and 20 are calculated in such a way

  that the differences in the paths traveled by the

  printing port 2 inside the cooling system 7, resulting from the pivoting in the positions drawn in lines

  interrupted and whose reference numbers are followed by a

  This is equivalent to saying that the length of the path traveled by the belt 2 is not changed when the cooling roller and calendering roller 18 rotates. The same goes for the clutch and disengagement of the calender roller. calender rollers is made by the piston 23 and 25, which can be actuated separately or together. When they can be actuated separately, it is possible for example to use the first two calender rollers 18 and 19 as the pair of usual cooling rollers, the rollers 20 and 21 Such a position is advantageous when the printing shows a tendency marked to palir The printing tape then undergoes first the usual cooling, which makes the ink more resistant, and it is then that the calendering takes place without there being

  fear ink lightening It is also possible to

  to carry out the calendering in stages, that is to say to operate the first pair of cylinders only under moderate pressure and to operate the second pair at full pressure. The surfaces of the calender rollers must

  in principle be extremely smooth, this condition applies

  especially in downstream calender rollers In certain circumstances it may also be desirable for the surface

  calender rollers of the first group presents a number of

  The tangential speed of the rollers can also be

  the diameter may vary from 20% of a pair of rollers to the other.

  This variation compensates for the lengthening of the paper which may occur

  under the effect of calendering and furthermore it allows

  perform additional smoothing.

  Fig. 4 shows another preferred embodiment

  of a cooling system 26 according to the invention of which

  the benefits lie mainly in the rationalization that

  In this drawing, four cooling and calender rollers 27, 28, 29 and 30 are still shown, but unlike those of the embodiment of FIG.

  3, are placed one above the other by means of

  (this time, for reasons of simplicity, it has not been shown) the chill rollers and calenders 27 and 28, as well as the chill and calender rollers 29 and 30 can be applied against each other. 27 to 30 of the cooling system 26 are mounted in the side walls (in Fig 4 only one, bearing the reference 37) in determined positions which correspond to the mounting positions of the printing cylinders in the

  printer groups that precede the chiller system 26.

  It is thus possible to standardize the side walls 37 and the side walls 38 of the cooling systems and the

printer groups.

  At the same time, it is possible to install, between such standardized lateral walls 37, application apparatuses 31 and 32 which make it possible to coat the upper face and the lower face of the printing medium 2 with silicone. It is furthermore indicated that given the space available, to install dialers 33 and 34 as well as a paper gripping device It can be mounted both upstream and downstream of the group of cooling rollers and is particularly advantageous in the case o There is a tear of the band in the folder that follows the chiller system 26 or in a device placed upstream We see in 36 another place

  possible for the device for gripping the paper web.

  The four cooling and calender rollers 27 shown in FIG. 4 are leveled in

  determined holes that are identical to the holes in the four cy-

  The printing cylinders 38 of these printing cylinders are

  are the plate cylinders 39 and 42 and the blanket cylinders 40 and 41, by means of which the printing medium can be printed on both sides when

  she scrolls through the printing group 38.

  According to the contact pressure that is necessary

  to apply in each particular case the cooled rollers

  usual sisters may be braced or their envelopes

  can be properly reinforced in such a way that we can

  obtain, even in the middle regions, a calming effect

Sufficient enough.

t 509665

Claims (12)

  1 rotary press comprising at least one printing unit   for the printing of a print media tape, a   positive dryer mounted downstream of the last printing unit and a cooling system following this drying device and containing several cooler rollers around each of which passes the printing support tape, characterized in that at least two of the cooling rollers (9 , 10, 18,   19; 20, 21; 27, 28; 29, 30) are adjustable in the position of   the chill rolls (9, 10; 18, 19; 20, 27, 28; 29, 30) can be used as calender rolls for   at the same time calendering the printing medium (2) with   to cool, and in that a device for compensation of length   (12, 13, 18 21) is attached to:   (7, 17), the purpose of which is to compensate for differences   which occur in the lengths traveled by the ban-   of print media (2) when clutching and disengaging   chill rollers (9, 10; 18, 19; 20, 21).   Rotary press according to claim 1, characterized in that at least four cooling rollers (18, 19, 20, 21) are constructed as calendering rollers which can be brought into contact in pairs so that the length of the print media tape in the chiller system 7 always remains the same regardless of the position of the rollers chillers (18, 19, 20, 21).   Rotary press according to Claim 2, characterized in that, in each of the pairs of cooling rollers (18, 19; 20, 21), one cooling roll (19, 21) is permanently mounted and the other (18, 20) ) is mounted so that it can undergo pivoting or translation.   Rotary press according to Claim 1, characterized   in that it is equipped upstream or downstream of the cooling system   of a path length compensation device (12, 13) which consists of a permanently mounted conductive roller (12) and a conductive roller (13) which can be adjusted in translation or pivoting position and that this conductive roller (13)   is coupled, by an adjusting device (14), with the arrangement   adjusting device (15) for a cooling roll (9).   Rotary press according to one of the preceding claims, characterized in that the clutch of two cooling rollers (9, 10; 18, 19; 20, 21) is effected by means of an eccentric adjusting device ( 15; 22; 24) acting on one of the chill rollers (9; 18; 20), which can be actuated by an electromagnet or a engine cylinder (16; 23; 25).   Rotary press according to any one of the   cations, characterized in that the cooling rollers   dissectors (27, 28, 29, 30) are arranged one above the other.   (Fig 4) and the position of the bearings of the cooling rollers.   (27, 28, 29, 30) in the side walls (37) corresponding to   to that of the printing cylinders (39, 40, 41, 42) of a printing unit (38) having the structure of a printing group   double-sided offset with four cylinders.   Rotary press according to claim 6, characterized   in that a silicone application apparatus (31, 32) is   mounted on the side walls (37).   8 rotary press according to claim 6, characterized   in that a paper gripping device (35, 36) is   mounted in the side walls (37).   9 rotary press according to claim 6, characterized   in that a dialer is mounted in the side walls (37).   Rotary press according to any one of the   tions, characterized in that the pressure of   tact of the chill rollers can be set.   11 Rotary press according to claim 10, characterized   in that the contact pressure in the first pair of cooling rollers can be set to zero and that of the following pairs of cooling rollers can be adjusted   at gradually increasing values.   12 Rotary press according to any one of the   cations, characterized in that the rollers of   landings have, in their diameters, a gradation which leads to higher and higher speeds in the direction of scrolling paper.   13 Rotary press according to any one of the   tions, characterized in that the surface of the rolls   coolers of the first couple is less smooth than the one   chill rolls of the next couple.