FR2692196A1 - Washing device for rolls or rolls in printers, especially sheet-fed offset printers. - Google Patents

Abstract

- The present invention relates to a washing device for cylinders or rollers in printers. - According to the invention, the washing device (6) is suspended in two pivoting devices (16) arranged on the opposite side walls of the printer, with a pivoting drive, the pivoting devices (16) being associated with the cylinders or rollers (2-4) of a printing unit so that the pressing element (7), by pivoting the washing device (6), can be positioned, via a pivoting drive arranged on a pivoting device (16), around a pivot axis (x), each time towards a surface to be cleaned of one of the cylinders or rollers (2-4), and on both side walls (15) of the printer, there is arranged a guide (14) integral with the frame, thanks to which the washing device (6), for a position of the pivoting devices (16), can be extracted from them and, in total, from the cylinder or roller zone (2-4).

Description

The present invention relates to a washing device for

  cylinders or rollers in printers, in particular sheet-fed offset printers, which has the following elements arranged between two side frames: a band-shaped cleaning cloth, which can be transported from a clean bobbin of cloth, which can being driven step by step, to a soiled cloth spool arranged parallel thereto, a pressure element that can be put into operation and out of service, around which is guided the cleaning cloth, and a spraying device associated with the pressing member for feeding a cleaning agent onto the cleaning cloth. DE-30025469 discloses a device for washing rolls or rolls in printers in which a cleaning cloth is guided by a roll of

  a clean web, via a bar-shaped pressure member and extending over the width of the printer's format, to a soiled web spool that can be driven stepwise. Moreover, these units are arranged between two side frames with yet another device for spraying

  In this case, the pressure element consists essentially of an inflatable hose with compressed air which is introduced into a sheet metal. shaped, so that the

  cleaning cloth soaked with cleaning liquid is pressed on the width of the roll or roll slowly After each cleaning process, the cleaning cloth 30 is transported step by step, so that the new cleaning cloth, not soiled , is available

  corn. With such a washing device for printers, however, it can not be cleaned each time that a cylinder of

  the printing unit, in particular the cylinder

  In fact, in printers having a construction

  With the five-cylinder or satellite type, however, two neighboring blanket cylinders co-operate with a counter-pressure cylinder, so that correspondingly several washing devices of the type briefly described

above are necessary.

  To solve this problem, it has already been proposed in EP-0 334 173 to guide a cleaning cloth over a plurality of pressure elements which are associated, in each case, with the cylindrical surfaces of a unit of double printing, and arrange, flat, this set to a corresponding point of the dual printing unit Thanks to

  a corresponding transport rhythm of the web of net-

  cleaning of the dirty cloth spool, for example before a washing process, enough clean cleaning cloth is made available, so that both the blanket cylinders and, if appropriate, also the cylinder The individual components of the washing device described in detail in this document are likewise mounted between two lateral frames, and the latter can be suspended in its entirety in a movable manner in each case a guide arranged on the side wall of the printer, for

  reasons for accessibility to the cylinders of the printing unit

  sion and, thus, it can be mounted by being extractable

of the printing unit.

  However, in this case, a disadvantage is that

  corresponding to the arrangement of the rolls, more

  pressure elements must be provided; which represents a corresponding high construction cost In fact, the counterpressure cylinder is washed more rarely, so that a pressure element provided in addition in this case

does not prove to be very effective.

  DE-2,815,388 discloses a device for washing rolls or rolls in printers, which is pivotally mounted to a crossmember by means of lever arms and can be brought against a plurality of roll surfaces. In this document, however, two washing devices are necessary, in their entirety, for washing the two blanket cylinders and the counterpressure cylinder of a five-cylinder printing unit. Simply, the lower washing device

  Alternatively, the arrangement described can be brought against the counterpressure cylinder, in particular because of the crossbar provided for the pivoting suspension, as being very disadvantageous with regard to the accessibility to the unit. 'impression.

  Accordingly, the present invention aims to develop

  the development of a washing device for cylinders or rollers in printers, in particular sheet-fed offset printers, of the type described above, so that, where necessary, the best possible accessibility to

  The cylinders of the printing unit and, at the same time, the washing of several cylinder surfaces, in particular in a five-cylinder printing unit, are possible by only one washing device.

  For this purpose, the washing device for cylinders or rolls in printers, in particular sheet-fed offset printers, of the type described above, is remarkable, according to the invention, in that the washing device is suspended in two pivoting devices each arranged on the opposite side walls of the printer with a pivoting drive, the pivoting devices being associated with the rolls or rolls of a printing unit so that the pressure element is

  pivoting of the washing device, can be positioned, by means of a pivoting drive arranged on a pivoting device, about a pivot axis, each 5 times towards a surface to be cleaned of one of the cylinders - or rollers, and in that, on both side walls

  In each case, the printer is provided with a guide secured to the frame, by means of which the washing device, for a position of the pivoting devices, can be extracted from them and, in total, from the zone of the cylinders. or rolls.

  Advantageously, on each of the pivoting devices, a guide channel aligned with the guide integral with the frame is arranged, in which the washing device can

to be inserted.

  In particular, the washing device can be suspended,

  by the trunnion-shaped ends of a bar passing through the two side frames and two trunnions arranged on the side frames, in the integral guide of the frame or the guide channel.

  Preferably, at the trunnion-shaped ends of the

  The bar is arranged frontally with a pin, eccentrically relative to the axis of rotation of the bar, which pin, with a profile provided in the guide channel, forms a locking device.

  According to another characteristic of the invention, the device

  Tif of washing can be moved in the guide secured to the frame and in the guide channel via a handle. Advantageously, the handle is arranged on the bar which

  form, with the pins, the locking device.

  According to yet another characteristic of the invention, the

  The swivel device on both side walls is constructed as a rotatably mounted plate with, each time, a carriage mounted linearly movable and drivable by a pneumatic cylinder.

  Preferably, the guide channel is arranged on the chain.

  riot, mounted in a linearly movable manner, of the pivoting device.

  According to another characteristic of the invention, the coil of

  dirty cloth, when the washing device is inserted, is formed by a drive arranged on a pivoting device.

As.

  Advantageously, the tree of the spool of soiled cloth pre-

  on one side of the washing device there is a plate having a slot into which a journal of a lever rotatably mounted on a pivoting device engages and which can be

  driven by a pneumatic cylinder.

  In addition, the swivel drive may have a

  working cylinder operating with compressed air.

  Thus, according to the invention, it is provided that a washing device of a type known per se is suspended, via

  the two lateral frames, in each case, on a pivoting device arranged on the side wall of the printer, this pivoting device being arranged in the region of the blanket cylinder and the counter-pressure cylinder, so that by pivoting the device

  In this case, the pressure element with the cleaning cloth guided on it is brought into each case in correspondence with a cylinder surface.

  Furthermore, according to the invention, provision is made

  washing device can be inserted into both parts of the swivel device, locked there and, again,

  manually removed from this swivel device The

  pivoting on the two side walls of the printer further comprises one or two drives to bring the washing device mounted in the angular positions

  for cleaning the two cylinders

  blanket or back-pressure cylinder.

  Moreover, according to the invention, it is provided that the trainer

  The invention relates to a stepwise embodiment of the step-shaped spooled cloth spool arranged in a part of the swivel device, that is to say on a side wall, and can be driven from there via a coupling. or in the manner of a

  The feed of the pressure element, food

  compressed air, as well as the feeding of the

  The corresponding cleaning liquid (solvent, water) is likewise sprayed via a coupling connection, of which a part is arranged on a pivoting device and the other portion is correspondingly formed. , is arranged on a

  side frame of the washing device.

  The invention also provides that, on both side walls of the printer, there is provided, each time, a guide secured to the frame, by means of which the device of

  washing can be moved to a so-called stationary position

  can be blocked at this location, so that optimal accessibility to the area of the unit is achieved.

  in which the device normally

  washing device (printing) This guide secured to the frame on the two side walls of the printer continues in a guide channel in the pivoting device In an angular position of the pivoting device (basic position), the washing device can be pulled in a so-called parking position Similarly to this, the washing device is moved again, from the parking position which is for example in the area of the plate cylinder of a printing unit, in the pivoting device and blocked there via a

locking mechanism.

  The pivoting devices or the washing device which can be locked therein are, for example, arranged at a location of a five-cylinder printing unit, such as,

  by pivoting the washing device in three positions.

  the pressure element can be positioned

  compared to the three surfaces of the two cylinders

  blanket and counter-pressure cylinder.

  pressure, in a basic position in which it is opposite to the surface of the back-pressure cylinder, take a sufficiently large distance from its surface (guiding of the sheets without smudging, separation of the fingers of the clamps), a trolley linearly movable can be further arranged, each time, on the pivoting devices for receiving the washing device, carriage which, on the one hand, serves to receive the washing device and, on the other hand,

  can be moved in the direction of the cylinders

  by means of corresponding linear guides

  and through a training element corresponding to

  for example a pneumatic cylinder Before each washing process, the washing device in the pivoting device is not only rotated but also moved to a washing position

  through the carriages on the pivots

  The pressure element must not be so designed as to cause a very large stroke of the cleaning cloth because of the protruding

  periphery of the counterpressure cylinder.

  The figures of the annexed drawing will make clear how

the invention can be realized.

  FIG. 1 shows the arrangement according to the invention of a

  washing device within a five-cylinder printing unit.

  Figure 2 shows the washing device on this width

format.

  Figures 3a and 3b illustrate the pivoting device

  found on both sides of the printer.

  Figures 4a and 4b show the two side frames of the washing device.

  FIG. 5 illustrates the suspension according to the invention

  the side walls of the printer.

  FIG. 1 shows the arrangement according to the invention of a washing device in the area of a five-cylinder printing unit of a sheet-fed offset printer. There is shown an upper plate cylinder 1 and a lower cylinder-plate 5, the cylinders door cooperating with them 2, 4, and the cylinder20 against common pressure 3 which here has a double diameter In Figure 1, the washing device designated in full by the reference 6 is in a basic position, the latter being chosen so that, by pivoting the washing device 6 about the axis designated by x, the pressure element 7, with the cleaning cloth 8 being thereon, can be rotated close to the respective cleaning surface of the blanket cylinders 2, 4 or the counterpressure cylinder 3 The pivot axis x is such that it has the same spacing by compared to cylinders 2 and 4 and, of a somewhat larger gauge compared to the cylinder of

back pressure 3.

  The washing device 6 is constructed in a known manner in

  and, as shown in FIGS. 1 and 2, between two side frames 9, a spool of clean cloth 10, from which the cleaning cloth 8 passes over the element

  7 The spool of soiled fabric 11 is furthermore driven step by step, as will be further explained in more detail below. a pressure device 7 is further provided with a spraying device by which cleaning liquid can be fed to the cleaning cloth 8 in the area of the pressure element 7. As is known, thanks to the stepwise transport 15 the cleaning cloth 8, an unsalted part of the cleaning cloth 8 is, each time, transported on the

  the active surface of the pressure element 7 and then it is inflated with compressed air so that the cleaning cloth 8 is pressed against the respective net-to-toyer surface of a cylinder.

  FIG. 2 shows the washing device 6 on the width of the format. In this figure, the two lateral frames 9 and the components arranged between them are shown. Between the two lateral frames 9, not only the shafts or shafts of the coils of clean canvas and dirty cloth, 11 but also a bar 12 whose ends protrude, each time, the side frames 9 in the form of trunnions Moreover, on the two side frames 9, are still arranged two trunnions 13 The trunnions of the bar 12, as well as the pins 13, carry the washing device 6 in two guides 14 integral with the frame, which are each arranged on a side wall 15 of the printer (FIG. 5). By means of these guides 14 secured to the frame, the washing device 6 can thus be moved from the basic position according to FIG. 1 to a parking position shown in phantom in this figure, which is shown in FIG. For example, at the height of the upper plate cylinder 1 The upward movement of the washing device 6 can also be carried out manually, as will be explained in more detail below. This parking position can be defined by For example, by an abutment By raising the washing device 6 above the abutments, an extraction

can moreover take place.

  According to FIG. 1, the washing device 6 is brought into the basic position by means of the guides 14 integral with the frame, the latter being formed by two pivoting devices 16, 17 arranged on the two lateral frames 15 of FIG. the printer, which have a corresponding extension of the guide 14 secured to the frame in the form of a channel

  21 (Figures 3a and 3b), in which, thus, the bar 12 and the pins 13 are inserted The washing device 6 introduced into the pivoting devices 16 is then locked.

  FIGS. 4a and 4b show the two pivoting devices 16 in detail FIG. 5 shows the two pivoting devices 16 on the opposite parts of the side walls of the printer According to FIGS. 3a and 3b and 5, the pivoting device 16 consists essentially, in each case, of a plate 17 arranged pivotably about the x-axis on the side wall 15, which plate, as shown only in principle in FIG. 5, is rotatably mounted via In this plate 17, a carriage 18 is arranged in a movable manner, for example, by means of two oblong holes 19 and on bolts 20, which carriage has an extension. of the guide 14 solidary frame for the ends of the bar 12 and il

  trunnions 13 in the form of the guide channel 21 The arrangement

  Washing device 6 can thus be introduced into the guide channel 21 of the pivoting device 16 from the position shown in phantom in FIG. 1 (parking position) via the integral guide 14.

building, and be blocked there.

  Figures 3a and 3b and Figures 4a and 4b show the locking mechanism by which the washing device 6 is locked with the pivoting device 16 or in the guide channel 21 by the carriage 18 The part, shown on 4a of the washing device 6 is also introduced into the portion, shown in FIG. 3a, of the pivoting device 16. The trunnion of the bar 12 has, at both ends, in each case, eccentrically relative to its axis, a pin 22 which, by rotation of the bar 12 (which is pivotally mounted, correspondingly in the lateral frame 9), is pivoted against a profile 23 inside the guide channel 21 The profile 23 in the form of a beak inside the guide channel 21 thus constitutes, with the pins 22 of the bar 12, the locking mechanism by means of which the washing device 6 is pressed against the end of the channel. guidance 21 The guide 14 s and the guide channels 21, have corresponding recesses for the pins 22 The rotation of the bar 12, that is to say the locking of the washing device 6 inside the pivoting device 16, is performed by a handle 24 arranged on the bar 12, thanks to which the

  washing device 6 can also be removed from the

Primante.

  As can be seen in FIGS. 3a and 3b, on each of the two pivoting devices 16, there is arranged, each time, a pneumatic jack 25 with a double effect, one end of which is articulated to the plate 17 of the pivoting device 16 and whose the other end (for example its piston rod) is articulated to the carriage 18 By supplying corresponding pressure fluid of the pneumatic cylinders 25, the carriage 18 and the washing device 6 which is locked thereon can thus be moved to a pivoted position according to

  FIG. 1 towards a surface of a cylinder

  blanket or back-pressure cylinder 2, 3, 4 to be cleaned, so that the pressure element 7 reaches an immediate vicinity of this surface to be cleaned. The advanced position, obtained by supplying pressure fluid, of the carriage 18 relative to the plate 17 of the pivoting device 16 is shown in broken lines

in Figures 3a and 3b.

  The fact that, in addition to the pivoting of the swivel device 16 for the washing device 6, a further lifting movement is provided, is caused by the fact that the pressure element

  7, constructed in a known manner, allows, during the feeding

  pressure fluid, a stroke of a few millimeters

  therefore, too narrow a spacing of this pressure element with respect to the backpressure cylinder, in order to guide the sheets without smudging, would be obtained in this basic position The washing device 6 can also be rotated without a collision with input protections possibly located in the

  swivel radius before the slots between the rolls.

  The pivoting devices 16 or the carriages 18 can pivot in the pivoting position according to FIG. 1 on one or both sides via, for example,

  same tires can be done.

  killed by a three-point work jack, made of

  corresponding way, which is arranged, correspondingly

  dante, between the side wall of the printer 15 and the plate 17, is, in a manner equivalent to that, by two single-acting working cylinders mounted one behind the other in a corresponding manner can be done without a figurative representation of the pivoting drive 26 (this is indicated in FIG. 3 a purely symbolic way), since the necessary construction is itself a simple result of the pivoting positions described. According to the invention, it is further provided that the drive for the soiled cloth spool 11 to be driven stepwise is arranged on one side of the printer, i.e. on a pivoting device 16, so that the washing device 6, after insertion and locking in the carriage 18, can be driven by a drive arranged there For this, the shaft of the soiled cloth spool 11 has, on one side, a plate 27 comprising a slot 28 in the manner of a slotted screw (Figure 4b), in which, during the insertion of the washing device 6 into the carriage 18, a pin 29 of a lever 30 on one of the trolleys 18 (Figure 3b) plunges the lever 30 is rotatably mounted on a carriage 18, about the axis which corresponds, when the washing device 6 is inserted, to that of the soiled spool 11 The pin 29 for the slot 28 of the plate 27 is furthermore on one arm of the lever 30 and, on the other arm of this lever 30, e For example, articulated the piston rod of a single-acting pneumatic cylinder 31 which rests on the carriage 18 inside the soiled cloth spool 11, that is to say inside the device. 6 are, for example, a corresponding spring means and a freewheel for stepwise driving of the cleaning cloth 8, as well as a device known per se by which the angular steps of the dirty cloth They are limited in a manner corresponding to the cleaning cloth 8 already therein, to always obtain a constant advance of the cleaning cloth 8 By not shown elastic means, the lever 30 and, thus, the plate 27 with the slot 28, after feeding the pressure agent of the pneumatic cylinder 31, are always brought back into

  a position parallel to the guide channel 21, so that a position is always obtained by which the washing device 6 can be removed from the carriage 18 of the pivoting device 16.

  To feed the washing device 6 inserted in the pivoting device 16 and locked therein by the corresponding compressed air for the pressure element 7 and, likewise, by the necessary cleaning fluid (solvent, water), a part of a multi-channel connection connection 32 for the compressed air and the cleaning agent is arranged on one side of the washing device 6 (FIG. 2) On the corresponding side of the pivoting device 16 ( 5), is arranged correspondingly made part of the connecting connection 33 on the carriage 18 of the pivoting device 16 By inserting the

  washing device 6 in the pivoting device 16 and thanks to the lock described inside the guide channel 21, the two parts of the connection link 32, 33 are pressed against each other with a force necessary for a transmission of liquid or air

  The supply of the cleaning liquid or compressed air could also be achieved by means of a pipe system of corresponding length.

Claims (9)

  Washing device for rolls or rolls in printers, particularly sheet-fed offset printers, which has the following elements arranged between two side frames: a band-shaped cleaning cloth, which can be transported from a reel of clean cloth, which can be driven stepwise, to a spool of soiled fabric arranged parallel thereto, a pressure element that can be put into operation and out of service, around which is guided the cleaning cloth, and a device for spraying associated with the pressure element to bring a cleaning agent onto the cleaning cloth. characterized in that the washing device (6) is suspended in two pivoting devices (16) each arranged on the opposite side walls (15) of the printer, with a pivoting drive (26), the pivoting devices (16) being associated with the cylinders or rollers (2-4) of a printing unit so that the pressure element (7), by pivoting the washing device (6), can be positioned, by means of a pivoting drive (26) arranged on a pivoting device (16), about a pivot axis (x), each time in direction of a surface to be cleaned of a cylinders or rollers (2-4), and in that, on both side walls (15) of the printer, a guide (14) is arranged   integral with the frame, whereby the washing device (6), for a position of the pivoting devices (16), can be extracted therefrom and, in total, from the area of the rolls or rolls (2-4).   Device according to Claim 1, characterized in that, on the pivoting devices (16), a guide channel (21) aligned with each other is arranged   with the guide (14) secured to the frame, in which the arrangement   washing agent (6) can be inserted.   3 Device according to claim 2, characterized in that the washing device (6) is suspended by the trunnion-shaped ends of a bar (12) passing through the two lateral frames (9) and two   trunnions (13) arranged on the side frames (9), in the guide (14) secured to the frame or the guide channel (21).   4 Device according to claim 3, characterized in that, at the two trunnion-shaped ends of the bar 12), is arranged, frontally, a   pin (22), eccentrically to the axis of rotation of the bar (12), which pin, with a profile (23) provided in the guide channel (21), forms a worm-rusting device.   Device according to one of the preceding claims, characterized in that the washing device (6) can be   moved in the guide (14) secured to the frame and in the guide channel (21) via a handle (24).   6 Device according to claim 5, characterized in that the handle (24) is arranged on the   bar (12) which forms, with the pins (22), the locking device.   7 Device according to one of the preceding claims, characterized in that the pivoting device (16), on the   two side walls (15) is formed as a rotatably mounted plate (17) with a carriage (18) mounted in a linearly movable and drivable manner each time. by a pneumatic cylinder (25).   8 Device according to claim 7, characterized in that the guide channel (21) is arranged   on the carriage (18), mounted in a linearly movable manner, of the pivoting device (16).   9 Device according to one of the preceding claims, characterized in that the dirty cloth coil (11), when   the washing device (6) is inserted, is formed by a drive arranged on a pivoting device (16).   Device according to claim 9, characterized in that the shaft of the soiled cloth spool (11) has, on one side of the washing device (6), a plate (27) having a slot (28) in which engage a   trunnion (29) of a lever (30) rotatably mounted on a pivoting device (16) and drivable by a pneumatic cylinder (31).   11 Device according to one of the preceding claims, characterized in that the pivoting drive (26) has   a working cylinder operating with compressed air.