FR2741007A1 - SHEET GUIDING DRUM FOR ROTATING - Google Patents

Abstract

The present invention relates to a sheet guiding drum for web presses, using a gripper bridge formed of a gripper shaft, grippers and gripper stop bars having a positioning device. - According to the invention, the rotary positioning device (3) acts on the elastically constrained grabber stop bar, and, on the side frame (11), a control cam (12) having upper and lower cam tracks can be pivoted at least in a fixed cylindrical joint by means of an actuator, and a roller (7) of a roller lever (6) can be periodically coupled to the control cam (12), while the drum (1) performs a rotational movement.

Description

The present invention relates to a guide drum of

  leaves between printing units or printing units.

  further processing and processing of presses, using one or more taker bridges which are uniformly distributed over the periphery of the drum and can be adjusted by remote control on different thicknesses

of print media.

  From DE-3 428 668 C2, there is known a central setting of taker stop bars for double and multiple size return drums. The individual adjustments of each support arrive at the means acting on the takers support and on these means act globally the positioning means regulating the takers support, positioning means which are actuated by a device of

  central adjustment arranged on the drum body. The provision

  In this case, the central control system may be driven by

  motor and be controlled from a control console.

  DE-4,233,422 Cl discloses a sheet taker device for presses which must provide an exact sheet transfer. In this case, the taker stop bar is guided approximately radially in a linear guide and presents, on the

  frontal faces, a pebble that forms, in the zone of trans-

  leaf feed, with a fixed control cam attached

  in the side frames, a pair of rolling. Through

  the control cam, the taker stop bar is moved down and up

leaf transfer.

  Document DE-4 337 578 A1 discloses a sheet guiding drum for printing machines, which comprises a fixed drive motor cooperating with trunnions of the drum and displacing, via a coupling corresponding, with central adjustment means, the taker stop bar, via a

  positioning device, with sliding wedges

  in an approximately radial direction. Document GB-2 098 966 A discloses a device for positioning the support of a lessee of a bridge of

  taker of a leaf guide cylinder. Positioning

  on the basis of the thickness of the printing medium to be treated is effected by means of a setting rod which is arranged, in the axial direction of the cylinder, in a displaceable manner against an elastic force, by means of of a screw, under a lessee's support extending above all

the length of the cylinder.

  It is disadvantageous that, for a centrally arranged adjustment

  stopper bars on the thickness of the

  of the print medium, a high cost is required.

  In the case of return drums with several taker belts, a basic adjustment and a fine adjustment of the taker stop bars therebetween is necessary to allow an exact common adjustment of all taker stop bars. During a continuous adjustment, a hysteresis often appears which is due to the friction and the play

in the joints.

  The object of the invention is to provide a non-centralized individual adjustment (upward or downward adjustment) of all leaf guide drum taker bridges in a printing machine, together with the thickness of the

print media to process.

  For this purpose, according to the invention, the sheet guide drum for rotary presses, using at least one taker bridge which is formed of a taker shaft, takers and taker stop bars which can be adjusted in the direction of rotation. radial arrangement on different thicknesses of printing medium and having an associated positioning device, and which is arranged on the periphery of the drum, is remarkable in that the rotary positioning device acts, by means of several pressure pieces, of adjustable way on the taker bar

  elastically, on the positioning device

  at a free end is arranged a roller lever pivotally with the positioning device, the roller lever having in accordance with the number of pressure pieces a plurality of stop positions, in which there is a detent which is coupled to a compression spring articulated on the drum, and in that, on the side frame, a control cam having upper cam channels

  and lower can be pivoted at least in an articula-

  fixed cylindrical arrangement by means of an actuating device

  and a roller lever roller can be periodically coupled to the control cam, while the

  drum performs a rotational movement.

  In addition, the positioning device is a positioning shaft arranged with an axis parallel to the taker stop bar and rotatable in drum housings. In addition, the pressure pieces are arranged so as to

  can be adjusted on the taker bar.

  Preferably, the cam channels of the control cam

  extend in a conical form from the outside towards the

  laughing. The solution according to the invention is essentially suitable for leaf guide drums (return drums). It can also be applied to sheet guiding cylinders and is thus also suitable for setting stop bars for drums of support drums or prepreneurs cylinders. The current

  The invention is particularly well suited to

  unit-sized or quadruple-sized

  printing cylinder diameter at unit size,

  as a corresponding number of taker bridges arranged symmetrically on the periphery. It is used to process print media of different thicknesses,

  such as paper or cardboard. The individual setting

  dual, non-centralized and remotely operable, taker supports of all sheet guiding drums in a printing machine, reduces switching times and minimizes subjective influences. In addition,

  the invention represents an economically

  automation. The actuator on the side frame is aligned with the circle of the positioning devices obtained during printing. From an actuating device attached to the side frame, the

  transfer of the adjustment movement of the posi-

  on the drum body is achieved by periodic coupling of the control cam, with the levers

  rollers arranged on the rotary film guide drum

  and associated with the positioning device. By means of the positioning device and the control cam, the taker stop bars of a sheet guide drum can be set in steps by the positioning device on the corresponding thickness of the print medium. By the stepwise adjustment of each taker stop bar, the hysteresis appearances are reduced significantly. In the practice of printing, it has been found that a continuous adjustment without any taker bars on the thickness of the print medium

  is not necessarily necessary. Many more, changes

  several steps, preferably two or three steps, are required. For paper processing (thin print media), the taker stop bar must be set high, and for cardboard processing (thick print media), the taker bar must be adjusted low. Sheet guiding drums of printing machines should not be

  turned in a defined angular position for the process

  However, all the taker stopbars are moved, for a lower rotational speed, for example during the slow advance of the printing machine, on the control cams on their circle so that a coupling between the roller lever and the control cams, adjusting the positioning device, is

performed periodically.

  For additional automation, activation of the actuating device acting on the positioning device is controlled in the control station of a printing machine, manually by the operator or by a device for the detection of the thickness of the print medium, which is coupled by a mounting technique

with the checkpoint.

  The figures of the annexed drawing will make clear how

  the invention can be realized. In these figures, references

  Identical references designate similar elements.

  Figure 1 is a front view of a waist drum

double.

  Figure 2 is a side view of the drum along the line A-A. FIG. 3 is a side view of FIGS. 1 or 4, according to

line B-B.

  Figure 4 is a front view of the lessee bridge and the

positioning device.

  Figure 5 shows the arrangement of control cams and a

  actuating device on the side frame.

  A web guide drum 1 is arranged in an offset press downstream of a printing cylinder of the upstream printing unit and a printing cylinder of another printing unit is arranged. downstream of the drum

  1. Relative to a single-sized printing cylinder

  1, the drum 1 is made with a double-sized drum body and thus carries two taker bridges 13. At the periphery of the drum 1, the two taker bridges 13 are

  arranged in a symmetrically distributed manner (offset by 180).

  Each taker bridge 13 consists of a taker shaft, takers 18 and taker bar 2

  can be adjusted approximately in the radial direction.

  The taker stop bar 2 carries for each taker 18 associated support pieces for the individual taker supports. The drum i is received, with the two drum journals, rotatably, each time in a housing of a side frame 11. At each taker stop bar 2 is associated

  a positioning device 3 which, independently of

  the thickness of the print medium, in steps, the upward or downward adjustment of the gripper stop bar 2. The positioning device 3 is received, in the form of a positioning shaft, of way to be able

  turn, in housings 5 on the drum body 1.

  For a drum i of double size, two positioning devices 3 are thus arranged. The taker 2 abutment bar bears elastically against the positioning device 3. Pressure pieces 4 are arranged, so that they can be adjusted, on the taker stop bar 2, corresponding to the number of not desired. In the present example, the taker 2 stop bar is adjusted in three steps, thus three pressure pieces 4 are arranged on the taker 2 stop bar. The pressure pieces 4 are supported on the

  positioning device 3, the positioning device

  3 having at its periphery recesses 14 which are

  in active connection with the corresponding pressure pieces

  4 so that a pressing piece 4 always bears on the positioning device 3 of the taker stop bar 2. The pressing pieces 4 always rest on the radius of the positioning device 3 so that positioning show no

  influence on the setting of the taker stop bar 2.

  At the free end of the positioning device 3, a roller lever 6 is arranged. The roller lever 6 carries a roller 7, as well as corresponding to the switching steps.

  in this case for three steps of

  In one of the stop positions 9 there is a detent 8 which is coupled to a pressure spring 10. The pressure spring 10, preferably a pneumatic spring, is mounted rotatively on the

  end faces of the drum 1. When rotating the drum

  bour, it appears by the positioning device 3 or the roller lever 6 an imaginary circle. A control cam 12 is arranged aligned with this circle on an adjacent side frame 11. The control cam 12 has upper and lower cam paths which extend, in approximately conical form, from the outside inwards. The control cam 12 is pivotally arranged at least in a cylindrical joint 16 of the side frame 11 and is further coupled with an actuating device 15, in this case an adjusting motor, as well as a power supply. 17. In Figure 5 are shown two control cams 12 which both tapering inwardly. Each control cam 12 is pivotally mounted on a cylindrical hinge 16 and has a common rotary coupling with the actuating device

  as well as the power supply arranged downstream.

  The mode of action is as follows. A drum 1 takes a printed sheet from the printing cylinder of a printing unit arranged upstream and transmits it to the printing cylinder of the printing unit arranged in

  downstream. When a print medium with a thick

  ality should be dealt with, it is necessary to

  higher or lower the taker 2 stop bar.

  The power supply 17 is activated, manually or also automatically via a control station. The actuating device 15, here an adjustment motor, is controlled by a mounting technique. This causes the actuating device 15 to pivot the control cam 12 so as to obtain a modified cam guide. The printing machine is rotated with a reduced rotation speed (slow feed). The roller 7 of the roller lever 6 passes through, in this case, the control cam 12 of conical shape, the roller 7 comes into contact with the upper or lower cam track (according to the current stop position) and is guided in the cam track so that the roller lever 6 is rotated into the new desired stop position 9. The pressure spring 10

  hold with the detent 8 the desired stopping position.

  9 so that the off position 9 is set.

  During the periodic coupling of the roller 7 and the cam of

  12, the positioning device is also rotated.

  3 in its housing 5 so that the current pressure piece 4 dips into the recess 14 and the adjacent pressure piece 4 carries the support of the taker stop bar 2. At least one pressure piece 4 is still resting on the positioning device 3. The drum body 1 can be actuated, in this case, in the forward or backward direction. By the conically shaped embodiment of the control cam 12, the desired stop position can be set at any time 9. In order to carry out the adjustment process for all the taker bridges 13, for each drum 1 of a control machine 12, printing, only a single rotation of the cylinder is necessary. This has the advantage that from a central position, it is also possible to set printing machines having a plurality of printing units arranged one behind the other.

  others, in series or simultaneously

born.

Claims (4)

  1. Sheet guiding drum for presses, using at least one taker bridge which is formed of a taker shaft, takers and taker stop bars which can be adjusted radially on different support thicknesses of printing device and having an associated positioning device, which is arranged on the periphery of the drum, characterized in that the rotary positioning device (3) acts, via a plurality of pressure parts (4), in an adjustable manner on the gripper stop bar (2) elastically constrained, on the positioning device (3) at a free end is arranged a roller lever (6) pivotally with the gripper device   positioning (3), the roller lever (6) having   the number of pressure pieces (4)   stops (9), in which a detent (8) is engaged which is coupled to a pressure spring (10) articulated on the drum (1), and in that on the side frame (11) a control cam (12) having upper cam channels   and lower can be pivoted at least in an articula-   fixed cylindrical arrangement (16) by means of an actuating device   tion (15), and a roller (7) of the roller lever (6) can be periodically coupled to the control cam (12),   while the drum (1) rotates.   Sheet guiding drum according to Claim 1, characterized in that the positioning device (3) is a positioning shaft arranged with an axis parallel to the gripper stop bar (2) and capable of   rotate in housings (5) of the drum (1).   Sheet guiding drum according to Claim 1, characterized in that the pressure pieces (4) are arranged so that they can be adjusted on the bar of taker stop (2).   4. Sheet guiding drum according to claim 1,   characterized in that the cam tracks of the com cam   Mande (12) extend conically from the outside to the inside.