FR2677968A1 - CUTTING DEVICE THROUGH BANDS. - Google Patents

Abstract

The invention relates to the shaping of printed products. In a device comprising a counter cylinder and one or more blade rollers arranged along it, as well as scrapers, so that the cut sheets are separated and reliably discharged from the counter roll, the scrapers (18) are engaged in grooves (17) of the counter cylinder (1) and the cutter bars (14) can retract in the region of the scrapers (18). Main application: rotary web printing presses.

Description

The invention relates to a crosscutting device for belts

  comprising a counter-cylinder which carries two cutting bars and one or more blade rollers disposed along said counter-cylinder, and a plurality of scrapers arranged next to one another in

  the axial direction and leaning against the counter-cylinder

  dre, to separate the cut leaf, and it can be

  implemented, for example, on printing presses.

rotating rolls.

  In the case of cutting devices in

  towards, it is known to arrange against the counter-cylinder several scrapers arranged next to each other,

  which separate the cut leaves from the counter-cylinder.

  These leaves are then discharged to a cylinder

  reader, for example by means of sets of belts.

  In such a device, there is a risk of jamming in the slot along which the scrapers are pressed against the side wall of the counter-cylinder

  The object of the invention is to create a device

  cross section for bands, comprising a

  cylinder carrying cutter bars and one or more

  sier blade rollers arranged along this

  cylinder, and several scrapers leaning against the

  against the cylinder, next to each other in the direction

  axially, to separate the cut sheet, in which

  the cut leaves are reliably removed from the

master cylinder.

  This problem is solved by the fact that

  They are engaged in counter-cylinder grooves and the cutter bars can be retracted into the

  Scraper region This device prevents it from becoming

  slit between the side surface of the counter-cylinder

  and scrapers and that there is no

  on the occasion of the separation of the leaves.

  The cutting bars are advantageously retractable

  tables when, according to the invention, each cutter bar is fixed on a lever mounted oscillating in the body of the

  counter-cylinder, and which rests on a cam.

  The invention will be described in more detail

  hereinafter in connection with an exemplary embodiment.

  The appended drawing, given solely by way of example, will make it clear how the invention can

  In this drawing, the single figure represents

  you schematically a cross cutting device by

a side view.

  The cross cut device shown

  comprises a counter cylinder 1 along which are arranged

  first and second blade rollers 2; 3, each having a circumference equal to the cutting length. These rollers each carry a cutting blade 4; The cutting blade 4 has a sharp cutting edge

  interruptions in which a group of cour-

  roies 6 running, resting against the counter-cylinder

  The cutting blade 5 also has interruptions which are offset with respect to those of the cutting blade 4. A group of running belts 7, which bears against the cylinder 1, crosses the cutting region in these interruptions The belts 6; 7 are returned by means of a common belt roller 8 The journals of the blade rollers 2; 3 and that of the roll

  8 carry a toothed wheel 9 to 11 respectively

  The blade roll 2 is in cinematic connection with

  that, by means of the toothed wheel 9, with a toothed wheel 12 of the countercylinder 1 The toothed wheel 11 of the belt roller 8 is also in engagement with the toothed wheel

  12 and drives the blade roll 3 through

  intermediate sliding wheel 13 and

  the gear wheel 10 The intermediate gear wheel

  Health 13 makes it possible to synchronize between the

  first cut and the next cut.

  The counter-cylinder 1 carries several bars of

  14 separated by a circumferential spacing distance

  individual ratio equal to the cut length Cha-

  that cutting bar 14 is fixed on a lever 15 which is mounted oscillating in the body of the counter-cylinder 1 and which bears against a cam 16 The counter-cylinder 1

  presents several circumferential grooves 17 in each

  one of which is engaged a scraper 18 To scrapers

  18 follows a group of belts 19.

  The strip 20 which is cut across, and which is, for example, a printed strip 20 which has been folded lengthwise by means of a folding cone, penetrates, with the support of the belts 21. , in the slot between the counter-cylinder 1 and the belts 6 On the

  line of the centers of the counter cylinder 1 and the roller

  2, the band 20 is partially cut by the cutting blade 4, which works in cooperation with a cutting bar 14, that is to say that interruptions of the cutting blade 4 leave in the line cut formed on the strip 20 of the solid parts which will be cut only at the time of cutting performed by the

  cutting blade 5 of the second blade roll 3, in cooperation with

  ration with the same cutter bar 14 Leaves

  if obtained are separated from the counter cylinder 1 by means of scrapers 18 and discharged, by means of the belts 7 and

  19, for example, they are brought to a collector cylinder

  The cutting bars 14 retract into the frame.

  This is done at the moment when the counter-roller 22 of the levers pass over the cam.

  fixed 16 during the rotation of the counter cylinder 1.

  In the exemplary embodiment, two blade rollers are placed along the counter cylinder Cross cutting devices in which a single blade roll is placed along the counter cylinder

  are also part of the patent protection area.

  Of course, various modifications and variations

  may be made by the person skilled in the art to the provision

  which has just been described, in particular by substituting

  the equivalent technical means, without

depart from the scope of the invention.

Claims (2)

R E V E N D I C A T IO N S   1 Cross-cutting device for belts comprising a counterweight which carries two cutter bars and one or more blade rollers arranged on the   along this counter cylinder, and a number of scrapers   next to each other in the axial direction and   against the cylinder, to separate the sheet   the cut, characterized in that the scrapers (18) are engaged in grooves (17) of the counter-cylinder (1) and the cutting bars (14) can   retract into the region of the scrapers (18).   2 Device according to claim 1, characterized   in that each cutting bar (14) is fixed on   a lever (15) mounted oscillating in the body of the counter-   cylinder (1) and which rests on a cam (15).