FR2633872A1 - DEVICE FOR DRIVING COUNTERPRESSION CYLINDERS FOR PRINTING MACHINE - Google Patents

Abstract

The invention relates to a device for driving backpressure cylinders for a printing machine such as a flexographic printer with several inking units. The kinematic chain of the device of the invention consists of a line of primary shafts 4 which ensure the synchronous drive of a succession of sectional control boxes 5 with radial outlet 6 which drive the backpressure cylinders. According to the invention, the device comprises means for individual adjustment of the angular setting of the outputs of the control boxes 5 which are in the form of movable supports 20 of the intermediate gear 11 gears 11. The invention relates to the construction industry. printing press.

Description

The invention relates to a training device for

  counterpressure cylinders for a printing machine such as a flexographic printing machine with several inking sets. It concerns the manufacturers of printing equipment. Typically, flexographic printers have a plurality of inking sets, each of which provides for color printing on continuous media. Depending on the number of colors to be deposited,

  the machine comprises a number of corresponding ink sets.

  The continuous support to be printed is often made up of a strip of

  paper, however, other materials may be used,

  in particular, textile or synthetic materials.

  Flexographic printers are referred to as individual counterpressure

  when each set of inking has a so-called counter cylinder

  pressure ensuring the training of the cylinder cliché which, he, prints the text

  on the medium to be printed, and the screen cylinder carrying the ink on the

lick cliché.

  Given the continuous operation of this printing system

  of a support band, it is essential that the different sets of

  crage work in a synchronized way. The tangential speed of each

  that counterpressure cylinder must be equivalent. In this respect, the

  Printing equipment manufacturers have developed drive mechanisms for counterpressure cylinders from a single pilot motor that meets the synchronism requirement for different ink sets. So far, however, these training mechanisms are very complex and are

  housed inside the support frame of the machine. These training mechanisms

  consist of a set of pinions coupled to each other which

  finally cooperate with the counterpressure cylinders to form a chain of

  does not cinematiqpe in one piece. Sometimes the solution is to link

  each of the engine counterpressure cylinders by a series of drive shafts

  Trailing also housed in the central part of the building.

  Whichever solution is chosen, it has two disadvantages

  which are, first, a particularly

  the central part of the machine which reduces accessibility at this level. Deu-

  x, the development at the start of printing is very delicate to

achieve.

  It is important for the drive mechanism to be

  -2- duit to allow a good accessibility to the machine and, in particular, to be able to thread without much difficulty the support strip to be printed through the different sets of inking and, this, through the middle

  the machine frame while leaving the rear of the machine

  available for the installation of the air supply pipes of the

drying.

  Regarding the development of the printer, including the setting. Cylinders cliché, relative to each other, so that they coincide perfectly, for printing different colors,

  it is necessary at present to carry out assembly and dismantling operations

  mounting of some parts of the drive mechanism to adjust the posi-

  angular arrangement over three hundred and sixty degrees of the cylinders cliche. Indeed, not only the synchronism of the movement must be respected, for each of the inking sets, but it is also necessary that they have no angular phase shift relative to each other, which would result in

  printing deports of different colors relative to each other.

  It should also be noted that the angular setting of the cylinders of each

  each inking unit must not only be adjusted at the beginning of the printing

  but also readjustments must be made during the printing process.

  especially when it comes to printing materials such as

  which are particularly sensitive to temperature.

  The main object of the present invention is to provide a device for driving the counterpressure cylinders for printing machine which is compact in size to allow good accessibility to the machine and which allows the independent angular adjustment of the cylinders for each set inking. This adjustment is done without disassembly of the organ, it is

  so very convenient to achieve and, moreover, it can be done in operation. This-

  This feature is particularly advantageous when corrections must be made during printing to correct an influence that

disrupts the impression.

  Another object of the present invention is to present a device for

  trailing which has an incorporated reversing switch. In this way, the

  angular setting of the cylinders can be performed in each direction of rotation.

  in the case of double-sided printing.

  Although particularly powerful, the training device of the present invention uses traditional manufacturing techniques.

  and the cost of its implementation makes it particularly attractive.

  The drive device of the counterpressure cylinders for

  not to be printed as a flexographic printer with several sets of

  whose kinematic chain consists of a line of primary shafts which provide the synchronous drive of a succession of radial-controlled sec- tion control boxes which drive the counter-pressure cylinders.

  characterized by the fact that it has individual adjustment means for

  angular range of control box outputs.

  The invention will be better understood on reading the following description

  accompanied by attached drawings among which:

  FIG. 1 illustrates a flexographic type printing machine with different

  inking sets; FIG. 2 schematizes the drive kinematic chain of the various counterpressure cylinders; 1b - Figure 3 schematically shows a first embodiment of a sectional control box according to the present invention; FIG. 4 represents another embodiment of a differential sectional control box; FIG. 5 represents the implementation of the angular adjustment device

  manual or motorized sectional control of Figure 4.

  The invention relates to a drive device for the cylinders of counterpres-

  for a printing machine such as a flexographic printing machine with several

  ink sets. It concerns the manufacturers of printing equipment.

  Although the invention was specially developed to bring

  solution to a problem encountered in the printing press, it could also

  extend to other types of activities or machines that include individual mechanical subassemblies to be synchronized and function

  with an adjustable phase shift and whose direction of rotation can be reversed.

  Flexographic printing machines with individual counterpressure

  inking units formed of a counterpressure cylinder which ensures the

  dragging a cliché cylinder which prints the text on the support to

  primer and a halftone cylinder reporting the ink on the cylinder cliché.

  Each inking unit corresponds to a color and it is of course necessary to operate them synchronously to obtain a rigorous positioning of each of the colors. Currently, there are used drive mechanisms housed in the frame of the machine that are formed

  either by a gear train or by a series of drive shafts.

  These techniques have two shortcomings, on the one hand, an im-

  on the other hand, at the beginning of printing, it is necessary to

  der the dismantling of certain parts to wedge each cylinder

  This is because any phase shift in one of them results in an offset of the color. This defect is even more troublesome than with

  certain synthetic materials, it is necessary to proceed, in the course of im-

  pressure, to recalculations of the different ink sets.

  FIG. 1 illustrates a flexographic type printer 1 which comprises

  the various inking units 2, distributed around the central frame 3.

  The synchronous drive kinematic chain of the various inking assemblies is illustrated in FIG. 2. The chain comprises a primary shaft line 4 which is connected to an unillustrated motor member. This line of trees

  Primary 4 serves to distribute the movements to different ink sets.

  The advantage of this line is that it is sufficient to extend it to increase the number of ink sets. The synchronism is perfect since the source of the movement is unique. On this line of primary shafts 4 is arranged a succession of sectional control boxes 5 which comprise a socket

radial 6.

  The role of these sectional control boxes is, on the one hand, to ensure the retransmission of the drive movement for the following sectional boxes, they include in this respect an input and an output in line. And

  they also distribute the movement to the counter cylinder.

  pressure using a radial outlet 6 on which the counter cylinder

  pressure is in direct contact or at least connected.

  Since continuity of movement is ensured by different

  gear trains or the like, the timing is perfect and the

  its angular shafts and cylinders are linearly dependent.

  For the reasons mentioned above, it is also necessary to

  ability to adjust the angular setting of the individual cylinders of each

  Inking colors, to match the color printing.

  According to the invention, the drive device whose kinematic chain -5- is illustrated in Figure 2 has means for individually adjusting the angular setting of the outputs 6 of sectional control boxes 5. These

  adjustment means may be actuated during printing to cor-

  manage a gap and it causes no rupture in the kinematic chain which ensures the synchronous operation of different ink sets. Of the

  In this way, the adjustment of the phase shift is independent of the transmission of the motion.

  main position. The setting does not interfere with the transmission of the possibili-

Adjustment tee when walking.

  Figure 3 shows schematically in sectional view a simplified sectional control box. This sectional control box 5 has an input 7 and

  an output 8 of the line of primary shafts 4, as well as a radial catch 9.

  The transmission of the movement towards the radial tap 9 is ensured by a gear train 10 constituting a gearbox which comprises intermediate gear wheels 11. According to the invention, the means for adjusting the angular setting of the radial output jack 6 of boot 5 are under the

  mobile attachment of one or more idler gears 11. For example,

  plen the pinions 11 are mounted on a support 12 mobile.

  The adjustment of the angular setting is obtained by moving the support mod-

  bile 12, it should be noted that at no time in its movement the idler gear is disengaged. So there is never a break in the chain

Kinematic transmission.

  Any displacement of a pinion gear causes a rotation of the kinematic chain placed downstream of this pinion. This movement is complementary to

  main driving movement.

  In the example of FIG. 3, the primary transmission comprises a

  conical pin 13 mounted directly on the primary transmission shaft 4. This conical pinion 13 is meshes with a pinion receiver 14 which transmits the

  lateral movement in a gearbox 15.

  In boot 15, a first motor pinion 16 is connected directly to

  the pinion shaft 14. This pinion motor 16 is meshes with a pin

  Refitting pin 11 on an auxiliary shaft 17 on which is also fixed a pinion gear 18 which transmits the movement to an output pinion

  19 placed directly on the output shaft 6.

  In this case, the auxiliary shaft 17 has its bearings fixed inside a housing 20 mobile in rotation around the radial socket 9. Under these conditions, the housing 20 can be operated in rotation which causes a displacement - 6 - of the auxiliary shaft 17 and a corresponding rotation of the idler gears

  11 and 18. This movement results in an angular shift of the output shaft

  tie 6 with respect to the primary shaft 4.

  Advantageously, the mobile casing 20 has a peripheral toothing 21 which allows an external operation by a steering wheel 22 connected to a drive pinion 23 meshing with the toothing 21. The steering wheel 22 will be maneuvered

  to adjust the angular setting of the counterpressor cylinder placed in

  sectional control box 5. A steering wheel lock 22 shall be

  be planned to prevent accidental dreggestion.

  FIG. 4 schematizes a second embodiment of the communication box.

  sectional wheel 5 which, in addition, comprises means for reversing the direction of

  rotation of the lateral output shaft 6.

  These means are in the form of a mobile nut 24 in translation.

  The nut 24 can be meshing with one of the two bevel gears 25 and 26 mounted idle on the shaft 4 and which are both meshing with a central bevel gear 14. which ensures the transmission of the movement towards the lateral exit 6. The gears and conical 26 are mounted on either side of the nut 24 and, depending on whether

  the nut is engrénée with one or the other, it follows a movement of rotation

  Inverted translation of the central pinion 14. The linear translation of the nut 24 is ensured, for example, by means of a claw 27 operated by an outer lever 28 which allows the nut 24 to be engaged with one or the other. other gear 25 or 26. This device for reversing the direction of travel could also be adopted to be incorporated in a sectional control box such as

as seen in Figure 3.

  The central bevel gear 14 transmits the movement to a differential 29. This differential has the particularity of having the cage

  planet carrier 31,32 blocked. In this way, the rotational movement

  driven by the pinion 33 mounted on the same shaft 34 as that of the bevel gear

  14, is fully retransmitted via the satellites 31 and 32 to the

  outlet bolt 35 mounted on the side output shaft 6.

  According to the invention, the satellites 31 and 32 which serve here as pedestrians

  They are mounted on a steerable cage, i.e.

  cage 30 can rotate around the support axis of the pinions 33 and 3.

  As previously, this rotating movement of the cage 30 causes a rotation of the satellites 31 and 32, independently of the transmission - 7 of the central movement of o an adjustment of the angular position of the shaft of

exit 6.

  To ensure rotation of the planet carrier cage 31 and 32, the cage 30 has a peripheral toothing 36 cooperating with a worm 37 manipulated externally. Figure 5 shows the two types of operation of the worm gear 37 for driving the toothing 36 which can be envisaged. This is a manual movement caused by the rotation of a flywheel 22 placed on the support shaft of the worm 37, or a motorized maneuver using a motor 38 which provides rotational drive of the support shaft

of the screw 37.

  In the previous examples, whether the gearbox or the locked differential, simplifications have been made to facilitate understanding. Other implementations of the present invention within the reach of those skilled in the art could also have been considered without departing from the scope

of it.

-8 -

Claims (10)

claims   1. Device for driving counterpressure cylinders for   China to print as multi-set flexographic printer   in which the kinematic chain consists of a line of primary trees   res (4) which provide synchronous drive of a succession of sectlonnel boxes (5) with radial engagement (6) which drive the counter cylinders   pressure characterized by the fact that it presents means of adjustment   of the angular setting of the output sockets (6) of the sec-   (5) and a device for reversing the direction of rotation between the shaft (4) and (6).   read 2. Device for driving the counter-pressure cylinders for   China for printing according to claim 1 including the control boxes section-   (5) comprise an inlet (7) and an outlet (8) of the primary shaft line (4) and a radial catch (6) in which the transmission   movement is ensured by a set of sprockets with an   medium (11) characterized in that the adjustment means are   in the form of a movable attachment of one or more gears (11) of return.   3. Device for driving the counter-pressure cylinders for   China for printing according to claim 2, characterized by the fact that   idlers (11) are attached to a movable support (20).   4. Device for driving the counter-pressure cylinders for   printing machine according to Claim 3, in which the primary transmission comprises a conical pinion (13) in direct contact with the primary shaft (4) and a pinion receiver (14) which transmits the lateral movement in a gearbox (10). the movement passes through an auxiliary shaft (17) characterized 2D by the fact that the auxiliary shaft (17) has its bearings fixed inside.   a movable housing (20) rotating about the axis of the receiving gear (14).   5.Control device for counterpressure cylinders for machine   Printed according to Claim 4, characterized in that the movable housing (2U) has a peripheral toothing (21) operated externally.   by a flywheel (22) connected to a drive pinion (23).   6.Device roll drive device for machine   to be printed according to claim 2, characterized in that the transmission   lateral connection passes through a locked differential (29) whose cage (30) carries satellites (31,32) is steerable.   7. Device for driving the counterpressure cylinders for printing machine according to claim 6, characterized in that the cage   (30) carrier (31,32) has a peripheral gear (36) cooperating with   with a worm (37) operated externally.   8. Device for driving the counter-pressure cylinders for   China for printing according to claim 1, characterized in that it comprises means for reversing the direction of rotation of the output socket radial (10).   9. Device for driving the counter-pressure cylinders for   China for printing according to claim 8, characterized in that the   means are in the form of a movable nut (24) solidarily   the primary shaft line (4) can be engaged with one of two bevel gears (23 or 26) on either side of the nut (24), both being meshing with a bevel gear central (14) which ensures transmission of lateral movement.   10. Device for driving counterpressure cylinders for ma--   Printing machine according to Claim 4, characterized in that a gear train (10) is interposed between the gear shaft (14) and the radial outlet (6).