FR2744389A1 - PRINTING GROUP ALLOWING CHANGE OF PRINTING PLATES ON THE GO - Google Patents

Abstract

In this printing unit for a printing machine comprising a transfer cylinder (5, 6) applying ink to a printing belt (7) and two plate cylinders (3, 4) cooperating with the transfer cylinders and carrying replaceable printing plates, at least one plate cylinder (3) can be moved away from the associated transfer cylinder (5) and stopped separately from the drive of other plate cylinders and when the cliché cylinder (3) is in position (9) for changing the printing plate, the transfer cylinder (5) can, by functioning as a back pressure cylinder (10) for the other transfer cylinder (6), be driven in synchronism with the latter and the plate cylinder (4). Application to offset printing presses.

Description

The invention relates to a printing unit for changing plates.

  printing in operation in a rotary offset web machine which is equipped with two transfer cylinders applying ink to a strip of printing material, which passes between them, and two plate cylinders, each cooperating with one of

  transfer cylinders and are fitted with printing plates

  interchangeable, and whose cylinders can be driven synchronously by being located remotely the

  each other in a pressureless position.

  According to the German patent application DE

  10 822 Cl, a printing group is known, which comprises

  door for changing printing plates in operation in a rotary offset web machine which is equipped with two transfer cylinders applying ink to a strip of printing material which passes between them and two door cylinders - plates, which each cooperate with one of the transfer cylinders and are fitted with plates

  interchangeable printers, and whose cylinders can

  wind be synchronized by being located at a distance

  tance from each other in a pressureless position.

  For changing the printing plates in operation, the transfer cylinders can be alternately clamped against an additional back-pressure cylinder, so that the ink can be applied to one side of the web of printing material, respectively. according to a

proceeded to withdrawal.

  A drawback is that for inking the two faces of the printing sheet by the transfer cylinders clamped against each other, the back pressure cylinder is not necessary. Regardless of the expense required for this cylinder, this conditions a

  particular configuration of the printing unit, which differs

  era of that of a four-cylinder printing unit.

  In addition, the printing position shifts respectively when changing the position of the printing unit when changing the printing plates in operation, and this is why additional alignment compensation provisions when continuing the processing of the web of printing material is required inside

the printing machine.

  In addition, the state of the art described can also be drawn from German patent applications DE 36 14 029 C1 and DE 38 25 145 C2 and from European patent applications EP 0 242 649 B1 and EP 0 276 745 A2, and in this

  last document, we even use two counter cylinders

  additional pressures, which can be applied against

  qué respectively, by tilting, a cylinder of trans-

  fert. According to European patent application EP 0 644 048 A2, it is known that a transfer cylinder and a plate cylinder form respectively in pairs a group of cylinders, the two cylinders being mechanically coupled together and being driven in common. by a special drive motor. Respectively two pairs of cylinders, between which the strip of printing material passes while receiving ink on one side or on both sides, cooperate so as to constitute a

printing area.

  With two printing areas arranged one behind

  the other in the direction of movement of the web of printing material, alternately

  a change of printing plates in operation, the change-

  ment of printing plates taking place at the level of the respective group of cylinders when stationary, when the transfer cylinders are spaced apart, by pivoting, from the strip of printing material. Consequently, in this type of operation, only two groups respectively

  of cylinders are used effectively for the pro-

  printing stops, in the case of this type of operation

  ment of four groups of cylinders.

  In addition, a drawback is due to the fact that

  sound of the change of the printing area in the case of a change of printing plates required only on one side, in the case of an ink application on both sides of the strip of printing material, the printing plates must be changed simultaneously

on the opposite side.

  The invention aims to create a group

  printing allowing the change of printing plates

  in operation of the type indicated above so that maintaining the printing areas on the web of printing material when changing printing plates in operation also guarantees a very large agreement in the configuration of groups of printing not designed for, or designed for, changing printing plates in use and, in the latter case, use

  economical in both types of operation.

  This problem is solved using a printing unit of the type indicated above, characterized in that at least one of the plate cylinders can be moved apart, by pivoting, from the associated transfer cylinder, to be brought into a position allowing the printing plates to be changed, and can be driven and stopped separately from the drive device for the other cylinders of the printing unit and that, when the plate cylinder is in the position allowing the

  changing the printing plates, the transfer cylinder

  fert can, by operating as a counter cylinder

  pressure for the other transfer cylinder, be driven in synchronism with this transfer cylinder and with the

  plate cylinder cooperating with the latter.

  According to another characteristic of the invention, the two screened cylinders can be moved alternately, by pivoting, from the transfer cylinder respectively associated so as to be placed in a position for changing the printing plates and that respectively the transfer cylinder associated with the cylinder plate holder spaced apart by pivoting cooperates, as a back-pressure cylinder, with the other transfer cylinder. According to another characteristic of the invention, a second transfer cylinder, which cooperates with a plate cylinder, can be clamped against a transfer cylinder which preferably is not movable for pressurization and is arranged under the as an additional printing unit, the pressurized printing unit can also be driven and stopped both in synchronism with the four-unit printing unit

cylinders only separately.

  According to another characteristic of the invention,

  several and preferably two or four printing units

  four cylinders are arranged one behind the other in the direction of movement of the web of printing material, depending on their equipment with respectively one or two plate cylinders which can be swiveled apart, as well as a mechanism additional printing, a continuous application of ink on one side or on both sides of the strip of printing material can be carried out with at least one or more inks and preferably up to two inks, in the case of '' a change of printing plates

working.

  According to another characteristic of the invention, the four-cylinder printing units are arranged in the form of U-shaped printing units or that the units

  printing cylinders are arranged in a

  double symmetric positive in the form of print units

  sion H. According to another characteristic of the invention, the four-cylinder printing units are configured respectively by being supplemented by a printing mechanism, in the form of Y printing units. According to another characteristic of the invention, respectively the two transfer cylinders of a four-cylinder printing unit can be driven

  directly via motors mounted respectively

  coaxial, while ensuring the possibility of radial displacement of at least one transfer cylinder towards its clamping position and its pressureless position, by

  the other transfer cylinder and the click cylinders

  chés are connected respectively via a front sprocket with straight teeth as well as by other front sprockets to an inking and wetting unit and,

  in a second mesh plan, mesh through-

  diary of a second front sprocket with a drive sprocket

  motor attached to the chassis, the main diameters

  the two front gears of the cylinders being identical

  ticks so as to allow a pivoting movement of the respective plate cylinder around the drive pinion and consequently the spacing of the plate cylinder by tilting from the cylinder

associated transfer.

  According to another characteristic of the invention, respectively the two transfer cylinders of a unit

  printing cylinders mesh with each other per-

  manence by means of pinions, while guaranteeing-

  sant a possibility of radial displacement of at least one

  impression cylinder to its tight position and posi-

  pressureless, away from the other transfer cylinder

  fert, a front sprocket of a cylinder which can be coupled

  plé, in a way maintaining the alignment, with a longitudinal shaft used for the synchronization of drive and in addition the two front sprockets of the cylinders are each connected to a front sprocket, which can be fixed in a correct way from the point alignment view, by means of a coupling both with respect to the longitudinal shaft and with an individual drive device for the respective associated plate cylinder, or otherwise is loosely mounted on a shaft of a front sprocket double, and that the second front pinion is fixed to the shaft and meshes with a drive pinion of a motor secured to the chassis, that the drive pinion also meshes with a front pinion with oblique teeth of the plate cylinder associated, which cooperates according to a drive link in a second drive plane, by means of a front sprocket with straight teeth having the same pitch diameter with an inking and wetting unit e t can pivot around the drive pinion while remaining in engagement with it and can be pivoted away from the cylinder of

associated transfer.

  According to another characteristic of the invention, the transfer cylinder of the printing unit, which can

  be tightened for printing against the transfer cylinder

  fert, which preferably cannot pivot when the individually driven cylinders of the four-cylinder printing unit are depressurized, meshes with a front sprocket with straight teeth and a front sprocket of the

  printing mechanism plate cylinder, guaranteed

  weaving a possibility of radial displacement for the

  rage and depressurization of the transfer cylinder, and that the front sprockets of the cylinder are connected to the inking and wetting unit and that the transfer cylinder of the printing unit has in a second plane drive a second gear with oblique toothing of the cylinder, which meshes with a drive gear of a

motor secured to the chassis.

  According to another characteristic of the invention, the transfer cylinder of the printing unit, which can

  be tightened for printing against the transfer cylinder

  fert which preferably cannot rotate when the cylinders of a printing unit are pressurized

  four cylinders with mechanically synchronized drive

  only by means of the longitudinal shaft, meshed, by a front pinion with oblique teeth with a front pinion of the printing cylinder of the printing unit, while guaranteeing a possibility of radial displacement for tightening and setting off pressure of the transfer cylinder, and has, in a second drive plane, a second front pinion having the same pitch diameter and which,

  otherwise, can be loosely secured with a strap

  plement so as to be properly aligned as well

  relative to the transfer cylinder than to the long shaft

  dinal and permanently meshes with the front sprocket of the associated transfer cylinder of the four-cylinder printing unit, and the front sprocket of the printing cylinder of the printing unit engages with a sprocket

  drive of a motor integral with the chassis and is also

  Lely connected according to a drive link to an inking and wetting unit by means of a double frontal pinion which allows the passage of an oblique toothing

in straight teeth.

  According to another characteristic of the invention, the plate-holding cylinders are equipped, on the side opposite the drive side, respectively with a lateral alignment adjustment mechanism which can cause

  the axial displacement of these cylinders.

  According to another characteristic of the invention,

  the oblique toothing front sprockets of the

  plates are arranged so that they can be moved axially-

  to be able to make a circumferential alignment adjustment

  of the respective plate cylinder.

  According to another characteristic of the invention,

  among the two transfer cylinders of the printing unit

  with four cylinders, a single transfer cylinder can pivot for clamping and depressurizing the cylinders, the strip of printing material surrounding the transfer cylinder pivoting in the clamped position so that in its depressurized position, she's passing

  without contact between the two transfer cylinders.

  The invention guarantees the maintenance of the zones

  printing with and without changing the printing plates

  on, the number of printing plates to change

  ger can be limited to a minimum number. All cylinders in the printing unit are used in both types of operation. Printing units not designed for changing printing plates on the fly and printing groups designed for such a change can be configured identically to a very large extent, since the space requirement for the additional spacing, by tilting, of the plate cylinders is small. In addition, this latter function

  can be carried out in conjunction with drive means

  provided for this purpose for the cylinders, by setting

  works a relatively small technical expense.

  Other features and advantages of the pre-

  sente invention will emerge from the description given below

  after reference to the accompanying drawings, on the-

  which: FIG. 1 represents a printing unit according to the invention with four cylinders produced in the form of a U-shaped printing unit; FIG. 2 represents two printing units according to the invention with four cylinders with a symmetrical arrangement in the form of an H printing unit; - Figure 3 shows a printing unit

  according to the invention with four cylinders comprising a mechanism

  additional printing device, as Y printing unit;

  - Figure 4 shows the arrangement of 2 uni-

  printing tees according to Figure 1 in the direction of movement of a strip of printing material with a change of the printing plates on when

  printing on the front on the lower plate cylinder

  left laughter as well as the illustration in dashed line of an additional change of printing plates in operation during the printing in withdrawal, by means of the application

  an ink on the web of printing material

  if we; - Figure 5 shows a device according to Figure 4 with a change of printing plates in operation at the upper left plate cylinder; - Figure 6 shows an arrangement of two

  printing units according to figure 2 with a change

  printing plates in operation on the upper printing unit when printing on the front or additionally when printing in withdrawal

  the respective application of two inks to the strip of material

  printing line; - Figure 7 shows an assembly according to Figure 6 with change of printing plates in operation at the lower printing unit; - Figure 8 shows an arrangement of two printing units according to Figure 3 with a printing mechanism adjusted without pressure, with a printing plate change in operation at the upper printing unit during l printing on the front or in addition when printing in withdrawal with respective application of an ink to the strip of printing material; - Figure 9 shows a device according to Figure 8 with change of printing plates in operation at the lower printing unit; - Figure 10 shows an arrangement according to Figure 8 in the case where the printing mechanism is clamped for printing, as well as the use of this printing mechanism as desired, illustrated by dashed lines, for changing the printing plate on the fly for applying ink to the material web

  printing when printing on the front and the applica-

  tion of up to two colors in the case of a withdrawal print; - Figure 11 shows an arrangement according to Figure 10 with a change of printing plate in operation at the lower printing unit;

  - Figure 12 shows a variant drive

  ment for a four-cylinder printing unit according to FIGS. 1, 2 and 3, with an individual cylinder drive device respectively;

  - Figure 13 shows a variant of training

  nement, increased printing mechanism, according to Figure 12, for the printing unit Y of Figure 3;

  - Figure 14 shows a variant drive

  ment for a four-cylinder printing unit according to FIGS. 1, 2 and 3, with individual drives synchronized by means of a longitudinal shaft; - Figure 15 shows a front pinion gear of the drive variant of Figure 14;

  - Figure 16 shows a variant of training

  increased, of a printing mechanism, according to Figure 14 for the Y-shaped printing unit according to Figure 3; and - Figure 17 shows a pinion mechanism

  front of the drive variant of figure 16.

  Figure 1 shows a four-cylinder printing unit 1 for offset printing, in the form of a U-shaped printing unit 2. The printing unit 1

  has two cylinders on the outside

  plates 3, 4, the replaceable printing plates of which are wetted in a manner not shown, known per se, by a wetting unit and are inked by an inking unit. Two transfer cylinders 5, 6, which are respectively in contact with the plate cylinders 3, 4, apply ink to the two faces of a strip of printing material 7 which passes between them. Among the two plate cylinders 3, 4, at least one of them 3 can be swiveled apart from the clamped position 8 to be brought into a position 9 for changing the printing plates, which allows a changing the printing plates when stationary, from the associated transfer cylinder 5, and which further guarantees, by the fact that it is driven in synchronism with the other cylinders of the printing group and by acting as as back-pressure cylinder 10 for the other transfer cylinder 6, an uninterrupted application of ink on one face of the strip of printing material 7. As indicated by dashed lines in FIG. 1, the second plate cylinder 4 can also be equipped in the manner described, for changing the printing plates in operation, so as to be able to

  switch from a printing position 11 to a position

  tion 12 for changing the printing plates, and the associated transfer cylinder 6 can be used as a back-pressure cylinder 13 for the other transfer cylinder 5. The spacing by pivoting of the two plate cylinders 3 , 4 during the printing operation

  is carried out in an alternate manner.

  Among the two transfer cylinders 5, 6, at least one of them 6 can be moved aside or pressurized so that the strip of printing material 7, which is wound over a small area around it cylinder at the level of the solid line represented when this cylinder is in the clamped position, passes without contact between the two transfer cylinders 5, 6 in the case where the cylinder is in the unpressurized position in accordance with the representation represented by a line formed by dashes. When all the cylinders of the printing unit are in the pressureless position, these cylinders can be driven without reciprocal contact and in synchronism with the movement of the web. For this purpose the plate cylinders 3, 4 which can be moved apart by pivoting, can tilt, at least in the case of a transfer cylinder 5 which cannot pivot, in an intermediate position which only releases contact with it. cylinder. FIG. 2 represents an H 16 printing unit, which consists of two 1.1, 1.2 four-cylinder printing units, arranged in a similar manner to the

  Figure 1 and arranged symmetrically.

  Depending on the fact that only the two left plate cylinders 3.1, 3.2 or also also the right plate cylinders 4.1, 4.2 can be swiveled apart from the respective transfer cylinders 5.1, 5.2 and 6.1, 6.2 , a respective ink may be applied to the strip of printing material 7.1 in an uninterrupted manner when printing on the front or also also during the printing in withdrawal, in the case of a change of the plates d in

market.

  Figure 3 shows a Y-shaped printing unit 17, which is constituted by a four-cylinder printing unit 1.3 which is increased by a printing unit 20 consisting of a transfer cylinder 18 and a plate cylinder 19. When in the closed position 21,

  the pivoting transfer cylinder 18 of the printing unit

  sion 20 is in contact with its cylinder as well

  photos 19 with the non-swivel transfer cylinder 5.3 of the four-cylinder printing unit 1.3. Therefore, the printing unit 20 can be used for a

  usual double inking or, in conjunction with a cylinder

  4.3 right swivel plates, which allows the printing plates to be changed on the fly, from the 1.3 four-cylinder printing unit for uninterrupted inking with a single ink, of the strip of printing material 7.2 when printing in withdrawal. The change of printing plates at the level of the plate cylinder 19

  takes place in all cases when the transfer cylinder

  associated fert 18 is fixed, in its pressureless position 22. Figures 4 and 5 show two U-shaped printing units 2 according to Figure 1, arranged one behind the other in the direction of movement of

  the band, in which case the basic variant comprising unique-

  The plate cylinders 3 which can be moved apart by pivoting, which are arranged to the left, allows, in the case of a change of printing plates in operation, an uninterrupted application of a single ink to the strip of material d printing 7.3 in the case of printing on the front and the variant represented by a dashed line fitted with plate cylinders 4 which can be moved apart by pivoting, which are arranged on the right, allows an ink application of this type also during

printing in withdrawal.

  In Figure 4, the change of plates

  printing is carried out in the case where the cylinder

  plates on the left 3 of the lower U-shaped printing unit 2 is fixed and spaced apart by pivoting and, in the variant represented by a dashed line, also at the level of the plate cylinder 4 on the right of the unit upper U printing 2, whereas in FIG. 5,

  the printing plates are changed in reverse-

  on the left plate cylinder of the upper U-shaped printing unit 2 or in addition to the level

  of the plate cylinder 4 on the right of the printing unit

lower U-shape 2.

  Figures 6 and 7 show two units

  H 16 of Figure 2, arranged one

  the other in the direction of movement of the strip, the basic variant comprising plate cylinders

  3.1, 3.2 can be swiveled apart, arranged uniformly

  only on the left, allowing, when changing

  printing plates running, uninterrupted application

  stinks of two inks on the strip of printing material when printing on the front, while the variant represented by lines in dashed lines and comprising plate cylinders 4.1, 4.2 which can be moved apart by pivoting and arranged additionally right, allows a

  such inking also in the removal process.

  In Figure 6, the change of plates

  printing takes place at the level of the

  pictures on the left 3.1, 3.2, which are swiveled away and fixed, from the upper H printing unit and, in the variant represented by a dashed line, the printing plates are also changed at the right plate cylinders 4.1, 4.2 of the lower H printing unit, while in FIG. 7 the printing plates are changed inversely at the left plate cylinders 3.1 , 3.2 of the lower H printing unit 16 or furthermore at the level of the right plate cylinders 4.1,

  4.2 of the upper H printing unit 16.

  Figures 8 to 11 show two units

  printing Y 17 of Figure 3 arranged one behind

  the other in the direction of travel of the tape.

  In FIGS. 8 and 9, when the printing mechanism 20 is placed out of service, an inking is obtained, similar to the case of FIGS. 4 and 5, of the strip of printing material 7.5 with the same possibilities of

  change of printing plates on.

  Figures 10 and 11 show an additional use of the printing mechanism 20 and its use for changing the printing plates in operation in order to guarantee an uninterrupted inking, with two inks, of the strip of printing material 7.6 during the 'impression

in withdrawal.

  In FIGS. 1 to 11, the triangles represented respectively by dashed lines on the strip of the printing material symbolize the inking in front

  be applied during continuous printing without inter-

  break when changing printing plates while the triangles represented by a line

  in solid lines symbolize the inking that can be performed

  sés in the case of an uninterrupted printing operation, when changing the printing plates. The triangles in phantom in parentheses relate to a possible realization in connection with another printing group of

same type.

  All four-cylinder printing units 1, 1.1, 1.3 have in common the fact that all the cylinders can be driven in synchronism with the movement of the web both in the clamped position

only in the pressure-free position.

  The plate cylinders 3; 3.1, 3.2, 3.3 and 4, 4.1, 4.2, 4.3 used for plate change

  printing can be stopped by being

  pivoted, separate from other cylinders

  still in the printing operation, and can be

  again accelerated to be brought to their speed.

  The printing unit 20 of the printing unit 17 can be driven in synchronism both during the tightening and during the pressurization of the cylinders with respect to the circulation of the tape and consequently with respect to the cylinders of the print unit with four cylinders and be stopped separately from this unit and be accelerated again to be brought to the speed of these cylinders. The cylinders of the printing unit can be driven in a motorized manner individually or in groups and in combination with a mechanical drive of the longitudinal shaft, which can be coupled and uncoupled, for the printing units, but in all cases the plate cylinders 3, 3.1, 3.2, 3.3 and 4; 4.1; 4.2; 4.3 which can be swiveled apart can be driven individually separately and optionally can be coupled, in a speed synchronous manner, with the other cylinders of the printing unit 1, 1.1, 1.2, 1.3 to four cylinders, in the case where individual drive units are not

present for all cylinders.

  FIG. 12 shows the drive for a printing unit 1, 1.1, 1.2, 1.3 with four cylinders, the cylinders of which are driven individually in a motorized manner. The two transfer cylinders 5 to 5.3; 6 to 6.3 are driven individually by motors 23, 24 mounted coaxially, the stator 25 of the motor 24 of the transfer cylinder 6 to 6.3, which can pivot for the

  pressurized, being articulated in a manner not shown

  felt on the chassis 26 by means of a torque receiving support, or which can be adjusted in a controlled manner

  via a movement mechanism of the system

  adjustment plate for eccentric bearing bushes of the transfer cylinder 6 to 6.3, on which is mounted

  fixed coaxially on the motor rotor 24.

  The plate cylinders 3 to 3.3 or 4 to 4.3 are connected respectively in a drive plane, by means of front gears with straight teeth 27, 28 and other front gears 29, 30 to inking units and wetting FW1 and FW2 and are equipped, in a second drive plane, with other front sprockets 31, 32, which mesh with drive sprockets 33, 34 of motors, 36 integral with the chassis. The pitch diameters of the two front pinions 27, 32 and 28, 32 of the cylinders are

  equal and allow pivoting of the cylinders

  pictures 3 to 3.3 or 4 to 4.3 around the drive sprockets

ment 33, 34.

  The plate cylinders 3 to 3.3 and 4 to 4.2 are each equipped, on the side opposite the drive side, with a lateral alignment adjustment mechanism 37, 38. The circumferential alignment adjustment plate cylinders 3 to 3.3 and 4 to 4.3 are carried out

  way set using the respective motor 35, 36.

  FIG. 13 represents a drive system of the four-cylinder printing unit 1.3 of FIG. 12, extended by an additional printing unit 20 of the Y printing unit 17 of FIG. 3. The transfer cylinder 18 of the printing unit 20 meshes in a

  training plan, via a front sprocket

  tal with straight teeth, with a front pinion 41 of the associated plate cylinder 19, which is connected via other front pinions 40 to an inking and wetting unit FW3. The transfer cylinder 18 has, in a second drive plane, a second front pinion 42 which meshes with a drive pinion 43 of a motor 44 secured to the chassis. The primitive diameters of the two

  front sprockets 39, 42 of the cylinder are equal and allow

  try to pivot the transfer cylinder 18 around the

drive gear 43.

  Figure 14 shows the drive system

  for a printing unit 1 to 1.3 with four cylinders

  carrying two individual drive systems 46 and 47 mechanically synchronized via a shaft

longitudinal 45, 45.1, 45.2.

  The two transfer cylinders 5 to 5.3, 6 to 6.3 are permanently connected to each other by means of respective front sprockets 46, 49 while guaranteeing a possibility of radial displacement of the right transfer cylinder 6 to 6.3 to put it out pressure by spacing from the left transfer cylinder 5 to 5.3. On the one hand, a pinion 51, which can be correctly coupled for alignment with the longitudinal shaft 45 by means of a gear unit 50 meshes with the left front pinion 48 of the cylinder, and on the other hand front sprockets 52, 53 of double front sprockets 54, 55 mesh with the two front sprockets 48, 49 of the cylinders, the second front sprockets 56, 57 mesh with the drive sprockets 58, 59 of motors 60 , 61 secured to the chassis. The front sprockets 52, 53, which are otherwise loosely mounted on shafts 62, 63 of the double front sprockets 54, 55, can be fixed by means of couplings 64, 65, in a correct manner from the point of view alignment as well with respect to the trees

  62, 63 than to longitudinal trees 45.1, 45.2.

  The drive pinions 58, 59 also mesh

  Also with the oblique toothing front sprockets 66, 67 of the plate cylinders 3 to 3.3, 4 to 4.3, which can

  be moved axially for the circular alignment adjustment

  template for plate cylinders 3 to 3.3, 4 to 4.3,

  to be brought in the state coupled to longitudi-

45.1, 45.2.

  In a second drive plane, second front gears with straight teeth 68, 69, having the same pitch diameter, plate cylinders 3 to 3.3, 4 to 4.3 which can pivot around the drive gears 58, 59 are connected by means of front sprockets 70,

  71 to inking and anchoring units FW1.1, FW2.2.

  Figure 15 shows, in an elevational view

  lateral position, the meshing conditions of the sprockets

  the drive variant of Figure 14.

  FIG. 16 represents a variant of drive

  which is augmented by an additional printing mechanism

  shutter 20.1, of the four-cylinder printing unit 1.3 of FIG. 14, as a Y-printing unit 17 of FIG. 3. A front gear with oblique teeth 72 of the plate cylinder 19.1 of the mechanism 20.1

  is linked in a motor connection on the one hand by the inter-

  medial of a double frontal pinion 73 making it possible to pass from an oblique toothing to a straight toothing, per unit

  FW3.1 anchor and anchor and on the other hand-

* directly to a front sprocket 74 of the associated transfer cylinder 18.1, with a radial clearance, necessary for the pressurization of this cylinder, as well as with a

  drive pinion 75 of a motor 76 secured to the chassis

  sis. The transfer cylinder 18.1 has, in another drive plane, a second front pinion 77, which meshes with the front pinion 48 of the left transfer cylinder 5.3 of the printing unit 1.3 with four cylinders and which moreover by being loosely mounted, can be fixed with correct alignment both with respect to the longitudinal shaft 45.3 and with respect to the

  transfer cylinder 18.1, by means of a coupling 78.

  Similarly, the plate cylinder 19, 19.1 of the printing unit 20, 20.1 is equipped, on the side opposite the drive side, with a transmission 79 for lateral alignment adjustment (figure 13) in the same way as the plate cylinders 3 to 3.3, 4 to 4.3 of the printing unit 1 to 1.3 with four cylinders (figure 13) and, in the drive variant of figure 16, is adjustable from the point of view of circumferential alignment by means of an axial offset of its front pinion 72 during

the printing operation.

  Figure 17 shows, in an elevational view

  lateral position, the meshing conditions of the sprockets

  the drive variant of Figure 16.

Claims (13)

  1. Printing unit for changing printing plates in operation in a rotary offset web machine which is equipped with two transfer cylinders applying ink to a strip of printing material which passes between them, and two plate cylinders, which each cooperate with one of the cylinders   and are fitted with inter-   changeable, and the cylinders of which can be driven synchronously by being located at a distance from each other in a pressureless position, characterized in that at least one of the plate cylinders (3 to 3.3) can   pivot away from the associated transfer cylinder   cie (5 to 5.3), to be brought into a position allowing the printing plates to be changed, and can be driven and stopped separately from the drive device   other cylinders of the printing unit and that when   that the plate cylinder (3 to 3.1) is in the posi-   tion (9) allowing the printing plates to be changed, the transfer cylinder (5 to 5.3) can, by functioning as a back-pressure cylinder (10 to 10.3) for the other transfer cylinder (6 to 6.3 ), be driven in synchronism with this transfer cylinder and with the   plate cylinder (4 to 4.3) cooperating with the latter.   2. Printing unit according to claim 1, characterized in that the two plate cylinders (3 to 3.3; 4 to 4.3) can be moved alternately, by pivoting, from the respective associated transfer cylinder (5 to 5.3; 6 6.3) to be placed in a position (9;   12) changing the printing plates and that   the transfer cylinder (5 to 5.3 or 6 to 6.3) associated   linked to the plate cylinder (3 to 3.1 or 4 to 4.1) discarded   by pivoting cooperates, as a counter cylinder   pressure (10 to 10.3 or 13 to 13.3), with the other cylinder transfer (6 to 6.3, 5 to 5.3).   3. Printing unit according to claims 1   and 2 sockets as a whole, characterized in that a second transfer cylinder (18; 18.1), which cooperates with a plate cylinder (19; 19.1), can be clamped against a transfer cylinder (5.3) which preference is not movable for pressurization and is   arranged as an additional printing unit   shut off (20; 20.1), the pressurized printing unit (20; 20.1) being able to also be driven and stopped both in synchronism with the printing unit (1.3) at four cylinders as separately.   4. Printing unit according to claims 1   with 3 sockets as a whole, characterized in that more   preferably two or four printing units   (1 to 1.3) with four cylinders are arranged one behind the   the others in the direction of movement of the web of printing material (7), according to their   equipment with one or two cylinders respectively   clichés (3 to 3.1 and 4 to 4.1) that can be moved apart by pivot   As well as an additional printing mechanism (20; 20.1), a continuous application of ink on one or both sides of the strip of printing material (7) can be carried out with at least one or several inks and preferably up to two inks, in the case   a change of printing plates in operation.   5. Printing unit according to the claims   1, 2 and 4 taken as a whole, characterized in that   the four-cylinder printing units (1) are arranged   created in the form of U-shaped printing units (2) or that the four-cylinder printing units (1.1; 1.2) are arranged in a double symmetrical arrangement under the   in the form of printing units H (16).   6. Printing unit according to claims 3   and 4 sockets as a whole, characterized in that the   four-cylinder printing units (1.3) are configured   respectively by being supplemented by a printing mechanism (20; 20.1), in the form of printing units Y (17).   7. Printing unit according to the claims   1, 2, 4 and 5 taken as a whole, characterized in that the two transfer cylinders (5 to 5.3; 6 to 6.3) respectively of a four-cylinder printing unit   (1.3) can be trained directly through   diary of motors (23; 24) mounted respectively coaxial, while guaranteeing a possibility of radial displacement   at least one transfer cylinder (6 to 6.3) to its position   tightening position and its pressure-free position, by the other   transfer cylinder (5 to 5.3) and the support cylinders   photographs (3 to 3.3) are linked respectively by the   diary of a front sprocket with straight teeth (27; 28) as well as by other front sprockets (29; 30) to an inking and wetting unit (FW1; Fw2) and, in a second engagement plane , mesh via a second front sprocket (31; 32) with a drive sprocket   (33; 34) of a motor (35; 36) secured to the chassis, the diag-   primitive meters of the two front pinions (27; 31 and 28; 32) of the cylinders being identical so as to allow a pivoting movement of the respective plate cylinder (3 to 3.3; 4 to 4.3) around the drive pinion (33 ; 34) and therefore the spacing of the plate cylinder (3 to 3.3; 4 to 4.3) by tilting from the cylinder   associated transfer (5 to 5.3; 6 to 6.3).   8. Printing unit according to claims   1, 2, 4 and 5 taken as a whole, characterized in that respectively the two transfer cylinders (5 to 5.3; 6 to 6.3) from a printing unit (1.3) to four   cylinders permanently mesh with each other through the   pinion gear (48,49), while guaranteeing a pos-   sibility of radial displacement of at least one cylinder   (6 to 6.3) to its tight position and its posi-   pressureless, away from the other transfer cylinder   fert (5 to 5.3), a front sprocket (48) of a cylinder for   before being mated, in a way maintaining alignment,   with a longitudinal shaft (45) used for synchronization   drive station and in addition the two front sprockets   (48,49) cylinders are each connected to a front sprocket   tal (52; 50), which can be fixed in an alignment correct manner, by means of a coupling (64; 65) both with respect to the longitudinal shaft (45.1; 45.2) and an individual drive device (46; 47) for the respective associated plate cylinder (3 to 3.1; 4 to 4.1), or otherwise is loosely mounted on a shaft (62; 63) of a double front sprocket (54 ; 55), and that the second front pinion (56; 57) is fixed to the shaft (62; 63) and meshes with   a drive pinion (58; 59) of a motor (60; 61) solid   part of the chassis, that the drive pinion (58; 59) also meshes with a front pinion (66; 67) with oblique teeth of the associated plate cylinder (3 to 3.1; 4 to 4.3), which cooperates in a connection drive in a second drive plane, by means of a front sprocket with straight teeth (68; 69) having the same pitch diameter, with an inking and wetting unit (FW1i1; FW2.1) and can pivot around of the drive pinion (58; 59) while remaining in engagement with the latter and can be moved apart by pivoting from the associated transfer cylinder (5 to 5.3; 6 to 6.3).   9. Printing unit according to claims 1   to 4, 6 and 7 taken as a whole, characterized in that the transfer cylinder (18) of the printing unit (20), which can be clamped for printing against the transfer cylinder (5.3) which preferably cannot   pivot when the driven cylinders are depressurized   born individually from the printing unit (1.3) with four cylinders, meshed, by a front pinion (39) with teeth   right with a front sprocket (41) of the cylinder   prints (19) of the printing mechanism (20), guaranteeing   sant a possibility of radial displacement for tightening and de-pressurizing the transfer cylinder (18), and that the front pinions (39; 41) of the cylinder are connected to the inking and wetting unit (FW3) and that the transfer cylinder (18) of the printing unit (20) has in a second drive plane a second gear with oblique teeth (42) of the cylinder, which meshes with a pinion   drive (43) of a motor (44) integral with the chassis.   10. Printing unit according to claims   1 to 4, 6 and 8 taken as a whole, characterized in that the transfer cylinder (18.1) of the printing unit (20.1), which can be clamped for printing against the transfer cylinder (5.3) which preferably cannot pivot when the cylinders of a cylinder are depressurized   four-cylinder printing unit (1.3) whose drive   is synchronized mechanically by means of the longitudinal shaft (45 to 45.2), meshes, by a front pinion (74) with oblique teeth with a front pinion (72) of the plate cylinder (19.1) of the unit printing (20.1), while guaranteeing a possibility of radial displacement for the tightening and the depressurization of the transfer cylinder (18.1), and has, in a second drive plane, a second front pinion (77) having the same pitch diameter and which, if not, can be loosely fixed by means of a coupling (78) so as to be correctly aligned both with respect to the transfer cylinder (18.1) and to the longitudinal shaft (45.3) and permanently meshes with the front sprocket (48) of the associated transfer cylinder (5.3) of the four-cylinder printing unit (1.3), and that the front sprocket (72) of the plate cylinder (18.1) of the printing unit (20.1) meshes with a drive pinion (75) of a motor (76)   integral with the chassis and is also connected along a link   its drive to an inking and wetting unit (FW3.1) by means of a double frontal pinion (73) which allows the passage from an oblique toothing to a straight toothing.   11. Printing unit according to claims   7 to 10 taken as a whole, characterized in that the plate cylinders (3 to 3.3; 4 to 4.3; 19; 19.1) are   equipped, on the side opposite the driving side   respectively of an alignment adjustment mechanism   lateral (37; 37.1; 38; 38.1; 79) which can cause displacement- ment of these cylinders.   12. Printing unit according to claims   8 and 10 taken as a whole, characterized in that the front gears with oblique teeth (66; 67; 72) of the   plate cylinders (3 to 3.3; 4 to 4.3; 19.1) are available   placed so as to be axially displaceable in order to be able to carry out a circumferential alignment adjustment of the   respective plate cylinder (3 to 3.3; 4 to 4.3; 19.1).   13. Printing unit according to claims   1 to 12 taken as a whole, characterized in that among the two transfer cylinders (5 to 5.2; 6 to 6.2) of the four-cylinder printing unit (1 to 1.2), only one   transfer cylinder (6 to 6.2) can pivot to serve   rage and pressurization of the cylinders, the web of printing material (7; 7.1) surrounding the pivoting transfer cylinder (6 to 6.2) in the clamped position (14) so that in its depressurized position (15 ),   it passes without contact between the two transfer cylinders fert (5 to 5.2; 6 to 6.2).