EP1136409B1 - Device for braking test or faulty sheets in a sheet processing machine - Google Patents

Abstract

A device for braking sample and defective sheets of a machine for processing sheet-like printing materials includes a sheet-guiding part for guiding a sheet therealong, a roller resting on the sheet-guiding part and being movable at least in a vertical direction, for braking a sheet guided between the sheet-guiding part and the roller; and a machine for processing sheet-like printing material, such as a printing machine, including the braking device.

Description

The invention relates to a device for braking sample and Defect sheet of a machine that processes flat substrates, such as one Printing machine, wherein a sheet is guided along a sheet guide part, as well as a flat printing material equipped with such a device processing machine, in particular printing machine.

Such machines, in particular printing machines, have stacking stations in which the for further use, e.g. intended for further processing Sheets are filed. When starting up such a machine, be it with a new print job or when starting after a Interruption in printing, sheets are printed which are not yet the desired one Have quality and are defective in this respect and as an error sheet or Waste can be called. These may not be processed in the intended stack of paper stored, but must be rejected.

Furthermore, test sheets are regularly closed while the machine is in operation remove, on the one hand to continuously check the quality of the print image, on the other hand to document the quality of the print within the framework of the Workflow related standards, such as the ISO 9000 standard.

For ejecting the sheets e.g. Institutions known to the Release of the conveyed by a chain conveyor and on grippers held sheet over the normal storage position of the sheet in a to Delay further processing of the intended batch, i.e. open the grippers later than when a good sheet stack is formed.

After the sheets have been ejected, they must be braked to avoid them to be able to feed a separate storage. There are elastic stops for this known which absorb the kinetic energy of the bow. The disadvantage is on the one hand that an adaptation to such known devices different types of paper, such as paper types of different thickness, or different sheet formats is not possible or only possible to a limited extent, on the other hand a risk of damage to the sensitive test sheets in particular then arises when the kinetic energy of the sample sheet only is absorbed by braking forces acting on its leading edge.

Furthermore, brushes are known which move the bow by frictional forces slow down between bristles and bow. There is also a risk of this Impairment of the bow.

The invention has for its object, while avoiding the aforementioned Disadvantages of a simple and inexpensive device for braking Sample and error sheet of a machine that processes flat substrates propose.

According to the invention, this object is achieved with a device having the features of claim 1. Document DE-U-7219031 discloses a device which the features of the preamble of claim 1 contains.

Due to the inventive design of the device for braking Test and error sheets will be in a constant position stored properly and can be manually done if necessary can be removed without a Operator must be ready. One of the device according to the invention Sheet fed via the sheet guiding part occurs with its leading edge in contact with the vertically elastically mounted roller, thereby counteracting this the gravity acting on them is increased by the strength of the bow and can be rotated. The arch is between the arch guide and roller slowed down by friction, causing damage of the bow is avoided.

In a preferred embodiment it is provided that the roller one in essential vertical stop for the bow is arranged. In this case a sheet guided between sheet guiding part and roller is braked so far, that damage to the same upon contacting the subsequent one Stop is reliably avoided. Therefore there are none for the latter Damping devices required; however, such options are optional be provided. After springing back of the sheet at the stop, the roller again in rotation with reverse direction of rotation and the bow brought to a standstill between the sheet guide and the roller. Thus the Absorption of the kinetic energy of the bow over a relative long way and consequently only slight braking forces act on the bow, so that damage to the same is avoided.

The device is for different types of paper of different thicknesses, especially suitable for cardboard boxes because the position of the vertical elastically mounted roller the thickness of one between it and the sheet guide adapts the guided sheet and the roller always lies against the sheet to its absorb kinetic energy. The distance between the roller and the The stop is in the order of the gripper edge of the bow.

The roller is preferably made of a soft elastic material, especially rubber, which also has a high coefficient of friction afforded to effectively absorb and enter the kinetic energy of the bow Prevent the sheet from sliding along the roller without the roller in To set rotation.

While the roller can be lifted against its weight alone, looks a preferred embodiment that the roller elastically in the direction of Sheet guiding part is preloaded in order to increase the braking forces acting on the sheet increase and always a desired pressure of the sheet in the direction of To effect sheet guide.

Furthermore, it is preferably provided that the roller also has a horizontal one Movement component movable and against the transport direction of the Arch is preloaded elastically, so that damage to the leading Edge of a sheet, especially a sheet of greater thickness, e.g. one Cartons, when the roller comes into contact by springing back is reliably avoided.

The roller is preferably mounted in a spherical cap which is attached to the roller opposite side one with respect to the transport direction of the sheet has increasing slope and can be moved on it with a stationary guide part is in support contact, the calotte being elastic is biased against the transport direction of the sheet. This is how a slide bearing is formed between the guide part and the spherical cap, which is a Longitudinal displaceability of the roller ensures, in particular the Do not damage the leading edge of sheets of different thickness and simultaneously brake the sheets when they come into contact with the roller, by elastically preloading against the transport direction of the sheet Roller is moved along the slope so far in the direction of the arc until the distance between roller and sheet guide at least the thickness of the Arc corresponds. When the bow springs back from the stop, one retrograde longitudinal displacement of the roller by the between the guide part and spherical bearing formed over a point at which the distance of the Roll from the sheet guide part corresponds to the thickness of the sheet, prevented and the sheet is stopped by the roller.

To the device according to the invention on different types of paper adjust and the desired removal position of the by the roller for To set the sheet brought to a standstill, the contact pressure of the roller is up the sheet guide part is preferably adjustable. The contact pressure of the roller can for example by means of at least one vertically arranged adjusting screw be adjustable, which is in support contact with the calotte via a helical spring stands and the roller consequently with a variable force in the direction of the Prestressed sheet guide. Furthermore, the stop pressure is also preferred Roller on the slope by means of at least one horizontally arranged Adjusting screw adjustable with the calotte via a coil spring Support contact is and for example in a threaded hole of the Guide part is arranged.

One embodiment provides that the guide part with the calotte and Roller connected to a flap pivotable about a horizontal axis is, the device in the closed position in the operating position located and the discharged sheet can be removed after opening the flap is. In such a configuration, the adjusting screw for adjusting the Contact pressure of the roller on the sheet guide preferably in a threaded hole the flap arranged to the contact pressure of the roller on the Sheet guide part in the operating position of the device according to the invention closed flap.

Otherwise, the invention relates to a flat printing material processing Machine equipped with a device of the aforementioned type.

Fig.1

eine schematische Gesamtansicht einer Ausführungsform einer flächige Bedruckstoffe verarbeitenden Maschine in Form einer Offset-Druckmaschine, wobei die Vorrichtung zum Abbremsen von Probe- und Fehlerbogen links außen in einem gestrichelten Kreis relativ zur Gesamtvorrichtung vergrößert dargestellt ist;

Fig.2

einen schematischen, in Laufrichtung ausgeschleuster Bogen verlaufenden Vertikalschnitt durch eine Ausführungsform einer erfindungsgemäßen Vorrichtung zum Abbremsen von Probe- und Fehlerbogen;

Fig.3

eine schematische, teilweise geschnittene Ansicht in Richtung Pfeil III gemäß Fig. 2 und

Fig. 4-7

schematische Ansichten der Funktionselemente der erfindungsgemäßen Vorrichtung zur Veranschaulichung ihres Funktionsprinzips in verschiedenen Betriebssituationen.

The invention is explained in more detail below on the basis of exemplary embodiments with reference to the drawings. Show it:

Fig.1

a schematic overall view of an embodiment of a flat printing material processing machine in the form of an offset printing press, the device for braking sample and error sheets on the left outside in a dashed circle is shown enlarged relative to the overall device;

Fig.2

a schematic, in the direction of the run out running vertical section through an embodiment of a device according to the invention for braking sample and error sheets;

Figure 3

is a schematic, partially sectioned view in the direction of arrow III of FIG. 2 and

Fig. 4-7

schematic views of the functional elements of the device according to the invention to illustrate its functional principle in different operating situations.

Fig. 1 is an overall schematic view of a flat printing material processing machine 1 removable. This has a printing press 2, a sheet feed device 3 arranged in the same way on the input side thereof of an investor, a delivery arranged on the output side of the printing press 2 4 with a chain conveyor 4.1, one below the end of the Chain conveyor 4.1 arranged stacking station 5 and connected to this a device 6 for receiving and aligning sample and Error sheet on, here for clarification in a dashed circle is shown partially cut.

The sheet feed device 3 has an interchangeable, one made of sheet 8 formed stack 3.1 supporting stacking pad 3.2, for example in the form a pallet. For gradually lifting the stacking pad 3.2 corresponding to the deduction of sheet 8 from the stack 3.1 is one with lifting chains 3.3 working hoist provided. A separation unit is located above the stack 3.1 3.4 with lifting and drag vacuums for gripping each top sheet 8 of the stack 3.1 and for transferring such a sheet 8 to a transport and alignment unit comprising a suction belt conveyor 3.5 provided, which the sheet 8 at their leading and one aligns the lateral edge of the same for transmission.

The printing press 2, here a rotary printing press, has in the illustrated Embodiment two printing units 2a, 2 '. It is therefore for printing designed by two colors. To print additional colors is one for each Color to provide another printing unit.

The printing unit 2a has a printing cylinder 2.1 and one with the latter cooperating blanket cylinder 2.2 and one in each Printing unit to be printed sheets to the printing cylinder 2.1 Feed drum 2.3 on. The printing unit 2 'is with appropriate facilities fitted.

There is a between the transport unit 3.5 and the feed drum 2.3 Pre-gripper 2.4 arranged one of the transport and alignment 3.5 delivered and aligned sheet 8 takes over and him to the Feed drum 2.3 passes, which then it to the printing cylinder 2.1 of the first Printing unit 2a passes.

A sheet transfer device 2.5 is located between the printing units 2a, 2 ' intended. If two by such a sheet transfer facility connected printing units the same side of a sheet - with different Colors - print, so the sheets are handed over by her; insofar two connected by such a sheet transfer device Printing units print on the other side of a sheet, so that is appropriate sheet transfer device designed such that the sheets turned over to the subsequent printing unit.

For operation is a drive 2.6 with a motor driven Belt drive provided, the one with a gear Sheet transfer device 2.5 meshing drive gear 2.7 drives. In the present case, the chain conveyor 4.1 and the Paper feed device 3 with the drive 2.6 via corresponding gears in operative connection in order to stop the printing units 2a, 2 ' Shutdown of the rest, at the loading of the printing press with sheets or components involved in their output.

The printed sheets are in operative connection with the drive 2.6 here transfer the standing chain conveyor 4.1 of the boom 4.

The chain conveyor 4.1 comprises two conveyor chains 4.5, each of which one revolves along a respective side wall of the boom 4. A respective one the conveyor chains 4.5 loops around one of two operationally synchronously rotating Drive sprockets 4.2, whose axes of rotation are aligned, and is in the present embodiment over a compared to the drive sprockets 4.2 downstream with respect to the processing direction located deflection sprocket 4.4 out. The drive sprockets 4.2 are in a gear train of the printing press driven by the drive 2.6 involved. In the present example, the drive sprockets 4.2 are seated a common sprocket shaft 4.3. Between the two conveyor chains 4.5 extend gripper systems 4.15 carried by them with grippers 4.16, what gaps between grippers arranged on the pressure cylinder 2.1 drive through and an arc 8 while grasping a gripper edge on leading end of the sheet 8 immediately before opening the am Take over the pressure cylinder 2.1 arranged grippers from these. In the present Example are the sheets 8 from the lower chain runs in Fig. 1 transported. The section of the chain track that they pass follows one of these facing sheet guiding surface formed on a sheet guiding unit 4.6 4.7. Between the latter and the one above Arch 8 is preferably a supporting air cushion. For this is the Sheet guiding unit 4.6 with ends in sheet guiding surface 4.7 Blown air nozzles 4.8, for which only one is representative in FIG. 1 for their entirety and in a symbolic representation.

To a mutual gluing of the printed sheets 8 after storage in one To prevent stacks are on the way the sheet 8 from the Drive sprockets 4.2 to a sheet brake 4.9 a dryer 4.10 and one Pollination device 4.11 provided. To avoid excessive Heating of the sheet guide surface 4.7 is in the sheet guide unit 4.6 Integrated coolant circuit, which is symbolically represented in FIG. 1 by a Inlet port 4.12 and an outlet port 4.13 at one on the Arc guide surface 4.7 arranged coolant pan 4.14 is indicated. The Bow brake 4.9 includes a plurality of brake modules, each here are formed by means of a suction belt conveyor.

The sheets 8 are fed from the chain conveyor 4.1 into the stacking station 5 passed so that a stack 5.1 of sheets is formed in this. The Stacking station 5 has one in its upper receiving area for the sheets Front edge stop 5.2 and an opposite rear edge stop 5.3 through which the sheets are aligned. Furthermore points the stacking station 5 has a hoist, of which only one in FIG Stack 5.1 carrying platform 5.4 and this, dash-dotted indicated lifting chains 5.5 are reproduced.

A device (only indicated here) connects to the stacking station 5 for ejecting sample and error sheets and an inventive Device 6 for braking the sample and error sheets, which further is described in detail below.

The sheet processing machine 1 operates as follows:

A sheet 8 to be processed is removed from the stack 3.1 by the Separation unit 3.4 removed and to the transport unit 3.5 to hand over. As already mentioned, this transfers the sheet to the Pre-gripper 2.4, which in turn passes it to the feed drum 2.3. The arc is then through the printing units 2a, 2 'via the printing cylinder 2.1 and Sheet transfer device 2.5 passed through and printed.

The sheet 8 is from the last printing cylinder to a passing one Transfer the gripper system 4.15 to the chain conveyor 4.1. For storing the sheet 8 on the stack 5.1, the grippers 4.16 open to transfer the sheet 8 to the sheet brake 4.9 if a trailing section of the sheet 8 located above the bow brake 4.9. The bow brake conveys the bow 8 a lowering speed compared to the processing speed and releases it after reaching it, so that a accordingly slowed sheet 8 finally in the stacking station 5 on the Front edge stops 5.2 hits and aligned with this and on the trailing edge stops 5.3 opposite these together with previous and / or subsequent sheet forms the stack 5.1, the is lowered as the stack grows.

Should sample or error sheets, the latter referred to as so-called waste, are not deposited in stack 5.1, but are discharged, e.g. by manual operation of an operator an automatic opening of one Prevents bow 8 carrying gripper 4.16 above the stack 5.1 and a The grippers 4.16 only open in the area of the end of the lower run of the Conveyor chain 4.5 causes. At the same time, the suction operation of the brake 4.9 preferably interrupted.

It can be provided that basically when the machine starts up First, all the first sheets are rejected as waste until the desired quality is achieved. The operator can then manually file a file arrange for follow-up sheets on stack 5.1. An automatic Ejection of sheet 8 during operation can be done in such a way that after depositing a predetermined number of sheets in the stack 5.1 each Sheet 8 as a sample sheet and for documentation purposes, for example Quality assurance in accordance with the ISO 9000 standard.

The device 6 shown in Figures 2 and 3 for braking Sample and error sheet has a vertical stop 6.1 for the respective Bow 8 and one upstream of the stop 6.1, on a sheet guide part 6.3 seated roller 6.2 for gripping the sheet between sheet guide part 6.3 and roller 6.2 braking the same in the direction of the stop 6.1 and to hold the same after springing back on the stop 6.1. The Roller 6.2 preferably consists of an elastic material, which one provides a high coefficient of friction, especially of rubber. Your Longitudinal axis is designated 6.8.

The roller 6.2 is in the direction of the sheet guide part 6.3 and counter to the Transport direction 7.1 of the sheet biased and over a partial circumference of comprises more than 180 ° of a calotte 6.4, which on its roller 6.2 opposite side a with respect to the transport direction 7.1 of the sheet has rising slope 6.5 and slidable on this one stationary guide part 6.6 is in support contact. The angle of inclination α Slope 6.1 is e.g. between 10 ° and 30 °, in the shown Embodiment about 20 °. The contact pressure of the roller 6.2 on the The sheet guide part 6.3 can be adjusted using a vertically arranged set screw 6.10. which is in operative contact with the calotte 6.4 via a helical spring 6.11. Accordingly, the stop pressure of the roller 6.2 on the slope 6.5 is medium an adjusting screw arranged in a threaded bore 6.14 of the guide part 6.6 6.12 adjustable, which with a helical spring 6.13 Calotte 6.4 is in operative contact. In this way, the invention Device 6 suitable for sheets of different thicknesses, with a gentle Guaranteed absorption of the kinetic energy of the supplied sheets and consequently damage to the arch is avoided. The between roller 6.2 and sheet guide part 6.3 decelerated sheet come in a constant Withdrawal position at standstill.

The device 6 also has a pivotable about a horizontal axis 7.3 Flap 6.7, which with the guide part 6.6 with the calotte 6.4 and the Roller 6.2 is connected. In the Dar shown in Figures 2 and 3 position, the device 6 is in the operating position; the flap is 6.7 closed and locked by means of locking means (not shown). The Set screw 6.10 to adjust the contact pressure of the roller 6.2 on the The bow guide part 6.3 is arranged in a threaded bore 6.15 of the flap 6.7, so that the contact pressure of the roller 6.2 during operation with the closed Flap 6.7 is adjustable. To remove a sheet from the Device 6 is the flap 6.7 with the guide part 6.6, the calotte 6.4 and the roller 6.2 after corresponding unlocking about the axis 7.3 upwards pivotable so that a located between roller 6.2 and sheet guide 6.3 Sheet can be removed. 4 to 7 are schematic views of those stored in the calotte 6.4 Roller 6.2 in various operating situations of the invention Device shown.

In the operating situation shown in FIG. 4, a discharged sheet 8 approaches the roller 6.2 in the transport direction 7.1. The roller 6.2 is at rest. As soon as the leading end 8.1 of the sheet 8 comes into contact with the roller 6.2, it is raised according to the thickness s of the sheet 8 against the vertical bias F _V and thereby and according to the thickness of the sheet 8 against the horizontal bias F _H along the slope 6.5 shifted in the transport direction 7.1 of the sheet 8. The roller 6.2 is set in rotation by the sheet 8 and is guided in the direction of the stop 6.1 while braking the same.

At the time when the leading end 8.1 of the sheet 8 the Stop 6.1 reached (Fig. 5), the bow 8 springs into the Transport direction 7.1 opposite direction 7.2 back (Fig. 6) and Roller 6.2 is thereby set in an opposite rotation.

After complete absorption of the kinetic energy of the arch 8 is located the latter, for example, in the position shown in FIG. 7 and can by lifting the roller 6.2 (e.g. by swinging away the in Fig. 2, 3 shown flap) can be removed.

The frictional forces required to absorb the kinetic energy of the sheet 8 between the sheet and the roller 6.2 can be adjusted by varying the pretensions F _V and F _H. By selecting the angle α, the longitudinal displacement of the roller 6.2 induced by the thickness s of the respective sheet 8 and thus also the desired braking effect of the roller 6.2 can be set.

LIST OF REFERENCE NUMBERS

1

Sheet processing machine

2

press

2a, 2 '

printing unit

2.1

pressure cylinder

2.2

Blanket cylinder

2.3

feed drum

2.4

pregrippers

2.5

Sheet transfer device

2.6

drive

2.7

drive gear

3

sheet feeder

3.1

stack

3.2

Stack base

3.3

lifting chain

3.4

separation unit

3.5

Transport and alignment unit

4

boom

4.1

chain conveyors

4.2

drive sprocket

4.3

sprocket

4.4

nose wheel

4.5

conveyor chain

4.6

Bogenleiteinheit

4.7

sheet guide surface

4.8

blowing air nozzle

4.9

sheet brake

4.10

dryer

4.11

dusting device

4.12

inlet connection

4.13

outlet

4.14

Coolant tray

4.15

gripper system

4.16

grab

5

stacking station

5.1

stack

5.2

Leading-edge stop

5.3

Rear edge stop

5.4

platform

5.5

lifting chain

6

contraption

6.1

attack

6.2

roller

6.3

sheet-guiding

6.4

dome

6.5

slope

6.6

guide part

6.7

flap

6.8

Axis of the roller

6.10

screw

6.11

coil spring

6.12

screw

6.13

coil spring

6.14

threaded hole

6.15

threaded hole

7.1

Transport direction of the sheet 8

7.2

Direction of travel of the sheet 8 after springing back at the stop 6.1

7.3

Swing axis of the flap 6.7

8th

arc

8.1

leading end of arc 8

α

Inclination angle of the slope 6.5

F _V

vertical preload of the roller 6.2

F _H

horizontal pre-tensioning of the roller 6.2

s

Thickness of the bow 8

Claims (13)

1. A device for braking sample and defective sheets of a machine (1) for processing flat printing materials, such as a printing machine with a roller (6.2) being movable in at least a vertical direction and being elastically prestressed, the roller braking a sheet (8) which is guided along a sheet-guiding part between the roller (6.2) and a sheet-guiding part (6.3),
   characterized in that in an operating situation, the roller (6.2) lies on the sheet-guiding part (6.3) and the sheet (8) comes into contact with the roller (6.2) with its trailing edge.
2. The device according to claim 1,
   characterized in that the roller (6.2) is disposed upline of an essentially vertical stop for the sheet (8).
3. The device according to claims 1 or 2,
   characterized in that the roller (6.2) is formed of a soft elastic material, in particular rubber.
4. The device according to one of claims 1 to 3,
   characterized in that the roller (6.2) is preloaded elastically in the direction of the sheet-guiding part (6.3).
5. The device according to one of claims 1 to 4,
   characterized in that the roller (6.2) is also movable with a horizontal movement component and is preloaded counter to the transporting direction (7.1) of the sheet (8).
6. The device according to one of claims 1 to 5,
   characterized in that the roller (6.2) is mounted in a spherically recessed element (6.4) which has an inclined surface(6.5) sloping upwardly relative to the transporting direction (7.1) of the sheet (8) on a side thereof directed away from the roller (6.2) and being in supporting contact with a stationary guide part (6.6) for displacement on the inclined surface, the spherically recessed element (6.4) being preloaded elastically counter to the transporting direction (7.1) of the sheet (8).
7. The device according to one of claims 4 to 6,
   characterized in that the adjusting contact pressure of the roller (6.2) on the sheet-guiding part (6.3) is adjustable.
8. The device according to claim 7,
   characterized in that the adjusting contact pressure of the roller (6.2) on the sheet-guiding part (6.3) is adjustable by means of at least one vertically disposed adjusting screw (6.10) which is in operational contact with the spherically recessed element (6.4) via a helical spring (6.11).
9. The device according to one of claims 6 to 8,
   characterized in that the adjusting contact pressure of the roller (6.2) on the inclined surface (6.5) is adjustable by means of at least one horizontally disposed adjusting screw (6.12) which is in operational contact with the spherically recessed element (6.4) via a helical spring (6.13).
10. The device according to claim 9,
    characterized in that the adjusting screw (6.12) is disposed in a threaded bore (6.14) of the guide part (6.6).
11. The device according to one of claims 1 to 10,
    characterized in that the guide part (6.6) with the spherically recessed element (6.4) and with the roller (6.2) is connected with a flap (6.7) which is swivellable about a horizontal axis (7.3).
12. The device according to claim 11,
    characterized in that the adjusting screw (6.10) for adjusting the adjusting contact pressure of the roller (6.2) on the sheet-guiding part (6.3) is disposed in a threaded bore (6.15) of the flap (6.7).
13. A machine for processing flat printing materials, in particular a printing machine,
    characterized by
    a device according to at least one of the preceding claims..

Images