The invention relates to a conveyor for flat conveyed a printing press according to the preamble of claim 1.
In the conveyor flat conveyed, such as individual sheets, collected or folded sheet is conveyed with a rotatably mounted in a frame about a cylinder axis gripper cylinder. Such a conveying device can be used in a printing machine, in particular in a sheet-fed printing press or, following a cutting device which breaks down a printing material web unwound from a roll into individual sheets, in a web-fed printing press. The gripper cylinder of such a conveyor conventionally comprises a cylinder jacket and at least one gripper which is movable between an open position parked by the jacket and a gripping position pressing a piece of conveyed material against the jacket.
The gripper conventionally comprises a lever projecting from the pivot axis and carrying a roller at its tip. The roller is acted upon by a spring against the circumference of a cam, which extends with varying radii around the cylinder axis and thus controls a synchronized with the rotation angle of the gripper cylinder movement of the gripper.
The torque required to deflect the gripper against the force of the spring counteracts and delays the rotation of the gripper cylinder. The angular velocity of the gripper cylinder is therefore not exactly constant, but has proportions that oscillate with the rotational frequency of the gripper cylinder or a harmonic thereof. These oscillating components stimulate the press to oscillate and limit the maximum speed at which the press can be operated.
From the DE 10 2004 014 868 A1
a gripper shaft is known, on which the grippers are mounted and which is stretched over a torsion spring.
The invention has for its object to provide a conveyor for conveying flat conveyed a printing press.
The object is achieved by the features of claim 1.
An advantage of the conveyor is that the vibrations of the machine can be reduced and thus Doubliereffekte can be reduced.
Another advantage is that the conveyor can be used even at very high speeds.
Another advantage is the lower wear and a lower noise level, since no running noises.
The precise control of the gripper opening based on the machine position is another advantage of the conveyor.
Embodiments of the invention are illustrated in the drawings and will be described in more detail below.
1 a schematic section through a sheet-fed press;
2 a detail of a gripper cylinder in radial section;
3 a conveyor of the sheet-fed printing machine in axial section;
4 an angular velocity diagram;
5 a schematic side view of the device for moving the gripper.
In the 1 illustrated printing machine, in particular sheet-fed printing machine comprises a sheet feeder 01 , a belt table 02 , a bow plant 03 and a sheet delivery 04 , Between the bow plant 03 and the sheet delivery 04 are so-called works 05 ; 06 arranged, which are designed for example as a printing unit, coating unit, calibration or in any other suitable manner. 1 shows an example of two printing units 05 and a coating unit 06 , other printing and coating units not shown in the figure can between the printing units 05 and the coating plant 06 be provided. The printing units shown in the figure 05 In each case, different colors, in particular printing inks, print on a same side of the flat conveyed material passing through them, in particular sheets, and the coating unit 06 carries one on the same side Paint layer on. The printing or coating units, not shown, can print on the same side of the sheet, but it can also be a sheet turner present to allow double-sided printing of the sheet.
The printing works 05 each comprise two gripper cylinders 07 ; 08 for conveying the sheets to be printed. The gripper cylinder 07 each takes over the bows at an upstream gap 10 from the previous module, here from the sheet system 03 or the previous printing unit 05 Promote it by one of him and a cylinder 09 , z. B. transfer cylinder 09 , in particular blanket cylinder 09 formed pressure gap 11 and hands it over to a downstream gap 12 to the following gripper cylinder 08 ,
The coating plant 06 also includes a gripper cylinder 07 holding the bow at its upstream gap 10 from the gripper cylinder 08 of the previous printing unit 05 takes and that together with a paint roller 13 a gap 14 forms, through which the sheets are drawn, before they at the downstream gap 12 to the delivery 04 be handed over.
The gripper cylinder 07 ; 08 are with at least one holding means 15 , in particular a gripper 15 , in particular with two grippers diametrically opposite one another at their circumference 15 equipped, each in time when passing through a gap 10 respectively. 12 have to rise to grab a sheet or release him again, and him in the meantime on the peripheral surface of the gripper cylinder 07 ; 08 must be securely clamped.
On the gripper cylinder 07 directly on the sheetfed 03 following printing unit 05 lie the columns 10 and 12 diametrically opposite, so they each simultaneously from a gripper 15 be traversed and the grippers 15 can be brought simultaneously into the open position to a bow at the gap 10 from the bow plant 03 to take over and another at the crack 12 for the transfer to the following gripper cylinder 08 let go, or can be brought into the gripping position to the gap 10 clamp the recorded sheet.
At the gripper cylinders 07 of the following printing unit 05 and the paint shop 06 and the gripper cylinders 08 is the way the bows on the circumference of the gripper cylinder 08 ; 07 from a gap 12 respectively. 10 to the next gap 10 respectively. 12 shorter than half the circumference of the cylinder, even with these gripper cylinders 07 ; 08 can both grippers 15 be switched simultaneously between open position and gripping position, since the transition to the open position at a largely arbitrary time before passing through a gap 10 ; 12 , in which a sheet is received, or the transition to the closed position can be made to a largely arbitrary time after delivery of the conveyed sheet.
2 shows a section of one of the gripper cylinder 07 or 08 in section across its cylinder axis 27 , A cylindrical jacket 16 of the gripper cylinder 07 or 08 is through a channel extending in the axial direction 17 interrupted. In the channel 17 extends a cylindrical shaft 18 one of the two grippers 15 over the entire length of the gripper cylinder 07 or 08 , Several gripper fingers 19 are along the wave 18 distributed and rotatably connected with her. The wave 18 is about its longitudinal axis 20 pivotable. The channel 17 is largely through a coat 16 flush extending cover 21 covered. sharpen 22 the gripper finger 19 extend through a gap between the cover 21 and one's coat 16 limiting terminal block 23 , In the in 2 configuration shown press the tips 22 from the outside against the terminal block 23 to clamp the leading edge of an arch there. The clamping force required for this purpose is provided by a spring 24 provided here z. B. from a torsion spring, which is in the shaft 18 extends and from the two ends of a rotationally fixed to the shaft 18 and the other with a front 28 of the gripper cylinder 07 or 08 connected is.
Outside the cutting plane is on the shaft 18 a lever 25 rotatably mounted. At one end of the lever 25 engages a handlebar 26 , in particular a lever arm 26 , at. The driver 26 extends towards the outside of the picture 2 lying cylinder axis 27 ,
3 shows a schematic section through the gripper cylinder 07 or 08 along the cylinder axis 27 , The cutting plane passes through the two diametrically opposed channels 17 , in one of them is the gripper 15 with the on the terminal block 23 pressing gripper fingers 19 visible, noticeable. Also in the other channel 17 is a gripper 15 arranged.
From two front sides 28 of the gripper cylinder 07 and 08 stand axle journal 29 starting in racks 30 , eg side frame plates 30 of the printing unit 05 or Lackwerks 06 by means of rolling bearings 31 around the cylinder axis 27 rotatable, but in the direction of the cylinder axis 27 are immovably stored.
A rigid element 36 , z. B. a sprocket 36 , is around the cylinder shaft 27 , eg on a journal 29 attached around. This is about a handlebar 26 or lever arm 26 with the gripper shafts 18 connected. This connection includes a rotatable bearing (joint). The rigid sprocket 36 is via a circular gear 37 driven. The circular gear 37 sits on a wave 38 , outside the rotating cylinder 07 ; 08 is attached (eg in the sidewall 30 of the printing unit substructure). On this wave 38 also sits an elliptical gear 39 , This is in contact with another, identical elliptical gear 41 which is on the cylinder shaft 27 , eg on a journal 29 , the cylinder 07 ; 08 is appropriate.
The cylinder 07 ; 08 is operated via the main engine of the printing press. It moves at an angular velocity. With this angular velocity is also the elliptical gear 41 operated, which is on the cylinder shaft 27 located. Due to the translation of Ellipsenräderpaars 39 ; 41 results for the circular gear 36 or the sprocket 36 a non-uniform angular velocity. The lever arms 26 between gripper shafts 18 and sprocket 36 attached, transmit this non-uniform motion on the gripper shafts 18 , At the extreme points (or even one-sided extremes), the power transmission is so great that the spring force in the gripper shafts 18 can be overcome and the grapple 15 to open.
The elliptical gears 39 ; 41 , the circular gear 37 and the sprocket 36 are to be interpreted in such a way that the extreme points are reached only very short (short, high amplitude) and in the remaining time the angular velocity of the ring gear 36 as close as possible to the angular velocity of the cylinder 07 ; 08 is ( 4 ).
It is recommended to mount the gearbox on the drive side of the machine to ensure lubrication.
5 shows a schematic side view of the device for moving the gripper. The movement of the gripper 15 is about at least two elliptical gears 39 ; 41 controlled. An elliptical gear 41 the at least two gears 39 . 41 is preferably rotationally fixed on a cylinder axis 27 , in particular on a journal 29 , the cylinder 07 ; 08 arranged. Another elliptical gear 39 is preferably outside the cylinder 07 ; 08 rotatably arranged. The gear is preferred 39 together with a circular gear 37 arranged. The circular gear 37 is preferably arranged such that there is a on the journal 29 arranged circular gear 36 drives. Preferably, the gear is 36 arranged so that it is the gripper shaft 18 with uneven speed drives.
LIST OF REFERENCE NUMBERS
- sheet feeder
- belt table
- sheet feeder
- Factory, printing unit
- Plant, coating plant
- gripper cylinder
- gripper cylinder
- Cylinder; Transfer cylinder; Blanket cylinder
- paint roller
- Holding means; grab
- Wave; gripper shaft
- gripper fingers
- longitudinal axis
- terminal block
- handlebar; lever arm
- cylinder axis
- Frame; Side frame plate
- roller bearing
- Element, rigid; Ring gear; Gear, circular
- Gear, circular
- Gear, elliptical
- Gear, elliptical