DE102013010750A1 - Feeder for e.g. printing machine for underlapped supply of e.g. paper, has suction and transport unit controllable by control unit such that underlapped sheet current with defined underlapped flaking is produced - Google Patents

Abstract

The feeder (1) has sheet detecting units (61) detecting one or multiple edges (6.2) of an upper sheet (6). A mark is printed on the upper sheet or an edge in a print image of the upper sheet. A control unit (15) controls a suction and transport unit (60). The sheet detecting units and the suction and transport unit are arranged over a stack (6.1) and data-communicatively connected with the control unit. The suction and transport unit is controllable by the control unit such that underlapped sheet current with defined underlapped flaking is produced. An independent claim is also included for a method for separating a sheet from a stack and providing the separated sheet for a sheet processing machine.

Description

The invention relates to a sheet feeder for a sheet-processing machine according to the preamble of claim 1 and a method for separating sheet according to claim 6 and a further method for separating sheets according to claim 10.

State of the art

It has long been known from the prior art that sheets in sheet feeders by means of suitable lifting and / or conveying means, for example with the aid of suction and / or suction wheels, separated from a stack of sheets by lifting a respective first sheet and the sheets separated from each other Sheet processing machine, z. As a printing press, sheet folding machine or punching machine, are supplied. The sheets can either be spaced or underfold fed to the sheet processing machine.

Such a sheet feeder is in the DE OS 36 09 550 described. In this feeder blow nozzles for Vorlowe the sheet stack in a row are arranged adjustable side by side and are directed at the level of the uppermost sheet in the sheet stack on the stack trailing edge and / or the stack side edge and constantly supplied with blown air from a central Blasluftquelle. The blown air supply to other blower nozzles can be regulated according to the working stroke of the sheet feeder to form a kind of air cushion of carrying air for the top, raised by separating suction bow. The adaptation of the sheet separation device to different sheet material, in particular to different paper grades, by adjusting the height and the direction of action of the nozzles, the amount of air flow and by appropriate selection of nozzle geometries.

The DE 196 01 470 B4 discloses a drag sucker gear for the suction head of a sheet feeder. The Schleppsaugergetriebe causes the Schleppsaugern a firm motion profile is impressed to transport the separated sheets. For Schrägbogenkorrektur is provided that manual settings can be made on Schleppsaugergetriebe.

Despite this measure described, it is especially at increasing machine speeds that the sheets in the stack of sheets are not securely separated from each other or damaged during separation. Also, it happens that a bow is not passed cleanly into the scaly arc stream, z. B. then when the suction on the sheet begins late.

task

The object of the present invention is to provide a sheet feeder and to describe a method for separating sheets, which allow a separation of sheets from a stack into a submerged sheet stream, wherein the variation d. H. Variations in dandruff formation should be minimized.

This object is achieved by a sheet feeder according to claim 1. The sheet feeder according to the invention of a sheet-processing machine, in particular printing machine, punching or folding machine is the shingled providing sheets, especially paper, cardboard or plastic, with a sheet pile receiving a stack of sheets and with a suction and transport device fixed at least during operation of the sheet feeder for separating an uppermost sheet from the stack by means of suction air, holding the sheet by means of suction air and transporting the sheet. According to the invention, the sheet feeder has a boom detection unit for detecting at least one edge of the upper sheet, at least one mark or its position on the uppermost sheet or at least one edge or its position in the printed image of the uppermost sheet. Whether a sheet edge, a mark or the printed image is recorded depends on whether the sheets to be applied are printed or unprinted sheets. Next, the sheet feeder has a control unit for controlling at least the suction and transport unit, wherein at least the suction and transport unit and the boom detection unit data transmission technology, for example by means of lines, are connected to the control unit, so are in a data exchange connection. The boom detection unit and the suction and transport unit are disposed substantially above the stack above the uppermost arch. Advantageously, the suction and transport unit is controlled by the control unit such that a submerged arc flow is generated with a defined Unterschuppung. The control of the suction and transport unit by the control unit is carried out depending on the measurement result of the boom detection unit. This allows for adaptive dandruff formation; In other words, the transfer of a respective sheet into the submerged arc stream is dependent on the detected position of the sheet, so an individual movement profile is impressed on a respective sheet during its transfer to the unterschuppten sheet flow. As a result of the sheet feeder according to the invention, it is thus advantageously possible to produce a submerged arc stream with a constant degree of subsquading, with all sheets in the sheet stream approaching their desired position and there are no significant deviations.

In an advantageous embodiment of the sheet feeder according to the invention, the boom detection unit has at least one sensor for detecting at least the trailing edge of the uppermost sheet, wherein the sensor can be configured as a light scanner. However, it can also be provided a plurality of sensors, so that the position of the sheet in the circumferential direction, in the lateral direction and oblique direction can be detected. For this purpose, for example, two sensors detect the position of the sheet trailing edge and a line sensor, the position of the sheet side edge. Circumferential direction means the sheet transport direction, side direction, the direction perpendicular to the sheet transport direction and oblique direction means a rotation in the sheet transport plane.

In an advantageous development of the sheet feeder according to the invention, the suction and transport unit has driven suction belts. Alternatively, at least one driven suction wheel can be provided.

In a further alternative embodiment of the sheet feeder according to the invention, the suction and transport unit comprises at least one unit comprising a nozzle for generating a negative pressure by means of a whirlwind, in particular embodied as a vortex attractor, and at least one circulating, arranged below the nozzle driven conveyor belt, wherein a respective conveyor belt is individually controllable. Such a unit is described for example in US Pat EP 2 385 007 A2 , Such a design of the suction and transport unit is preferred because of its advantages: Thus, a low energy consumption is associated with a simple controllability and a very good suction. If the sheet feeder has a plurality of such units, they may be arranged one behind the other and / or next to one another, as viewed in the direction of the sheet transport.

In an advantageous development of the sheet feeder according to the invention, a degree of shingling is stored in the machine control or can be entered into the machine control. This Unterschuppungsgrad, which describes the proportion of overlap of each sheet in the sheet stream, can then be considered by the machine control in the control of the suction and transport unit, so that the arc current can be formed as desired.

The invention also relates to a method for separating sheets, in particular from paper, cardboard or plastic from a stack and providing a sheet-processing machine, in particular printing machine, punching machine or folding machine in a submerged sheet stream, wherein the singulation is performed by a sheet feeder, in particular one as described above. The method has the following steps: In a first step, a top sheet is sucked from the stack by a suction and transport unit. In a second step, a measurement of the sheet position of the sucked sheet by a Bogenerfassungseinheit, which may include sensors or a sensor camera. To measure the sheet position, either the position of the sheet trailing edge can be detected, as long as it is unprinted sheet, or it could also be a printed mark or edge in the printed image are recorded, if it is already printed sheet. In a next step, transport elements of the suction and transport unit are controlled as a function of the measurement result of the measurement of the sheet position in order to further transport the sheets for transfer to a submerged sheet stream. The transport elements are controlled in such a way that a respective arc assumes its desired position in the submerged arc current and the degree of subshing of the arc current is kept constant. The control of the transport elements, however, takes place at the earliest, as soon as the sheet is sucked in safely. The above-described steps are repeated for each next uppermost arc, so that a stable arc current with a constant degree of subshing is formed.

In a first development of the method according to the invention, the transport elements are actuated with an invariable velocity profile, wherein the start time at which the velocity profile is impressed on the transport elements is calculated as a function of the measurement result of the measurement of the sheet position. The movement sequence of a respective arc can thus be described by a path-time diagram which has the same shape for each arc but different start times.

In an alternative, particularly advantageous and therefore particularly preferred embodiment of the method according to the invention, the transport elements are controlled with an individual velocity profile, which is calculated as a function of the measurement result of the measurement of the sheet position. The movement of a sheet can therefore be represented in a path-time diagram which has different curves as a function of the detected sheet position for a respective sheet. Although this variant requires a higher computing power of the control unit, but larger and more accurate Corrections of the sheet position can be made by appropriate control of the transport elements.

In an advantageous development of the method according to the invention, the sheet position in the transport direction and / or transversely to the transport direction and / or a rotation of the sheet are measured during the measurement of the sheet position and the transport elements emboss a respective sheet during the transfer into a submerged sheet stream an alignment movement in the transport direction and / or obliquely to the transport direction, d. H. in the sense of a rotational movement, and / or transversely to the transport direction. It when the sheet trailing edge and at least one side edge of the sheet are detected for the measurement of the sheet position is particularly advantageous.

The invention also relates to a method for separating sheets, in particular from paper, cardboard or plastic from a stack and providing a sheet-processing machine, in particular printing press, punching machine or folding machine in a submerged arc stream, comprising the following steps: In a first step a suction of an uppermost sheet from the stack by a suction and transport unit. In a second step, the time is determined at which the sheet is safely sucked. In a third step, a control of transport elements of the suction and transport unit in dependence on the time determined in the previous step to transport the sheet for transfer into a submerged arc current takes place. By determining the time at which the sheet is securely sucked, it is ensured that each sheet is impressed the same transport movement and this is not changed, due to a premature or delayed safe suction of the sheet. The above-described steps are repeated for a next uppermost sheet, respectively, so that a sheet flow having a relatively stable degree of undermining is formed.

With regard to further advantages and constructive and functional aspects of advantageous embodiments of the invention, reference is made to the dependent claims and the description of embodiments with reference to the accompanying drawings.

embodiment

The invention will be explained in more detail with reference to preferred embodiments. It show in a schematic representation

1 a view of a sheet feeder according to the invention

2 : A top view of a sheet feeder according to the invention

3 : the transfer of the bow from a pile into a shallow stream of sheets

4 : the sheet feeder as part of a sheet punching machine

5 : the sheet feeder as part of a sheetfed press

6 : the sheet feeder as part of a sheet folding machine

Corresponding elements and components are provided in the figures with the same reference numerals.

1 shows a sheet feeder 1 for separating sheets 6 from a sheet pile 6.1 and handing over the isolated bows 6 in a submerged arc stream for onward transport of the submerged bow 6 in sheet travel direction B to a subsequently arranged sheet processing machine 100 . 200 . 300 , Above the pile of sheets 6.1 is a suction and transport unit 60 and a boom detection unit 61 respectively. 61 . 62 arranged. Both the boom detection unit 61 . 62 as well as the suction and transport unit 60 are data transmission technology with a machine control 15 connected. Once a top sheet 6 of the sheet pile 6.1 of suction elements of the suction and transport unit 60 sucked in, the position of the bow 6 through the boom detection unit 61 . 62 detected. The measurement result of the boom detection unit 61 . 62 gets to the machine control 15 forwarded and evaluated by this. In the machine control 15 there is a target-actual adjustment, ie the actual position of the sheet 6 comes with a nominal position of the bow 6 compared. The thus determined deviation is in the control of the transport elements of the suction and transport unit 60 taken into account and adjusted the movement profile of the transport elements accordingly. The transport elements of the suction and transport unit 60 thus cause both an alignment movement and at the same time a transfer movement of the bow 6 on his delivery to the submerged arc stream.

As in 2 As shown, the boom detection unit may have various sensors 61 . 62 have, in the example shown two Hinterkantensensoren 61 and a side sensor implemented as a line sensor 62 are provided. The trail edge sensors 61 detect the position of the trailing edge 6.2 of the uppermost arch 6 and thus allow a measurement of the sheet position in the circumferential direction, ie in the sheet transport direction B, and in Oblique direction, ie a rotation of the sheet in the sheet transport plane E. The side edge sensor 62 allows a measurement of the sheet position in the lateral direction, ie perpendicular to the sheet travel direction B.

Alternatively to measuring the position of the sheet trailing edge 6.2 and bow side edge 6.3 can also change the position of on the bow 6 printed stamps 6.4 through the sensors 61 . 62 be measured. This is not just a survey of the position of the bow 6 itself, but also a measurement of the printed image on the sheet 6 possible. Depending on the measurement result, the suction and transport unit 60 driven. As can be seen, this has two independently controllable units. The independent controllability of the units ensures that the bow 6 Aligning movements a in the sheet transport direction B, transversely to the sheet transport direction B and a rotational movement in the sheet transport plane E can run and aligned with the unterschuppten sheet flow in the region of the feed 16 can be handed over.

As in 3 shown, the suction and transport unit 60 have a plurality of units arranged one behind the other, wherein in the example shown, each unit is a single controllable conveyor belt 64 has, which z. B. can be designed as a suction belt. By measuring the orientation of a bow 6 sucked and the further transport of the bow 6 with an individual specific movement profile is achieved that the bow 6 in the area of the feed table 16 assumes its intended position in the submerged arc current and the arc current thus has a constant Unterschuppung U. A uniformly submerged sheet stream can be used in subsequent processing stations of sheet processing machines 100 . 200 . 300 be edited more precisely, since only a minor orientation of the bow 6 is required. Also, only a smaller time window for sheet alignment in the area of the feed table must be available.

In the sheet processing machine may be, as in 4 presented to a sheet punching machine 100 , as in 5 shown to a sheetfed press 200 or, as in 6 shown to a sheet folding machine 300 act. All machines 100 . 200 . 300 is common that this one as described above sheet feeder 1 have with above the sheet pile 6.1 arranged boom detection unit 61 . 62 and suction and transport unit 60 , In all three examples, the suction and transport units 60 a plurality of units, each comprising a nozzle for generating a negative pressure by means of whirlwind, which can be designed in particular as a vortex attractor. Below the nozzle at least one revolving, driven conveyor belt is arranged. In detail, this unit can be designed as in the EP 2 385 007 A2 described.

In 4 is the basic structure of a sheet punching and embossing machine 100 shown for punching, breaking, depaneling and storing sheets of paper, cardboard, plastic and the like. The punching and embossing machine 100 owns a feeder according to the invention 1 , a punching station 2 , a breakout station 3 and a boom 4 with storage and pay dividing station, by a common machine housing 5 be carried and enclosed and from a main drive 17 are driven. From one side, the so-called operator side, are the processing stations 2 . 3 . 4 accessible; on the opposite side, the so-called drive side, is the drive train of the sheet punching and embossing machine 100 , A machine control 15 controls the processes within the punching machine 100 ,

The bows 6 be through an investor 1 from a pile 6.1 through the suction and transport unit 60 isolated, the sheet transport system 7 via an alignment table 16 supplied and from on gripper bridges of a gripper carriage 8th gripped grippers seized at its front edge and in the sheet transport direction B intermittently through the various stations 2 . 3 and 4 the punching and embossing machine 100 pulled. Because the bow 6 through the suction and transport unit 60 Already pre-aligned is in the area of the alignment table 16 only a small amount of fine alignment required.

The sheet transport system 7 has several gripper carriages 8th so that several sheets 6 at the same time in different stations 2 . 3 and 4 can be edited. The gripper carriage 8th can be driven by a chain drive.

The punching station 2 consists of a lower crucible, a so-called sub-table 9 , and an upper crucible, a so-called upper table 10 , The upper table 10 is vertically reciprocally mounted and with an upper tool 30 provided with punching and Rillmessern. The undercounter 9 is firmly mounted in the machine frame and with a counter plate 20 provided to the punching and Rillmessern. Alternatively, the upper table 10 fixed and the undertable 9 be moved. In embossing, embossing tools, in particular in the form of so-called embossing dies, are used instead of the punching and scoring tools.

The gripper carriage 8th transports the bow 6 from the punching and embossing station 2 in the following stripping station 3 that with breakout tools 21 . 23 Is provided. In the stripping station 3 be using the stripping tools 21 . 23 the unwanted pieces of waste 11 out of the bow 6 pushed out to the bottom, causing the waste pieces 11 into a cart-like container inserted under the station 12 fall.

From the breakout station 3 the bow comes 6 in the boom 4 where the bow 6 is either simply filed, or at the same time a separation of the individual benefits of each sheet 6 he follows. The boom has this 4 a blanking tool 21 . 23 , The boom 4 can also do a palette 13 included on the individual sheets 6 or benefit in the form of a stack 14 be stacked so that after reaching a certain stack height the pallet 13 with the sheet pile 14 from the field of punching and embossing machine 100 can be driven away. To the machine 100 Auxiliary stacking devices can be used during the stack exchange.

The of the sheet feeder 1 bow provided in a submerged arc stream 6 be in the printing press 200 , as in 5 represented via a feed table 16 in the sheet transport direction B a first printing unit 40 fed. In this printing unit 40 and in other printing works 40 becomes a respective bow 6 printed before returning to a sheet delivery after a drying process 14 is stacked.

If the sheet-processing machine is a sheet folding machine 300 , as in 6 represented, so is a respective arc 6 in the submerged arc stream via a feed table 16 to a folding station 50 transported further, where a respective bow 6 It receives folds before being folded as a signature in a jib 14 is collected. In the area of the feed table 16 can be an additional alignment of a respective bow 6 by using alignment rulers and holding down a respective arch 6 , For example, by hold-down balls may be required. The degree of permissible subscheduling U for processing the bows 6 in the folding station 50 depends on the selected folding patterns and thus on the inlet length of a respective arch 6 into the different folding pockets of the folding station 50 ,

LIST OF REFERENCE NUMBERS

1

investor

2

Punching and / or embossing station

3

stripping

4

Outrigger, if necessary with Nutzentrennstation

5

machine housing

6

bow

6.1

sheet pile

6.2

Sheet trailing edge

6.3

Sheet side edge

6.4

imprinted mark or edge in the printed image

7

Sheet transport system

8th

Gripper carriage with grippers

9

Lower table / lower crucible

10

Upper table / upper crucible

11

trimmings

12

container

13

batch Capture

14

Delivery pile / Boom

15

Control with interface and input devices

16

feed

17

main drive

20

lower tool

21

Upper tool with punches

23

Dividing grille or stripping board (lower tool)

30

Upper tool (punching tool)

40

printing unit

50

folding station

60

Suction and transport unit

61

Trailing edge sensor

62

Side edge sensor

63

Drive transport element

64

conveyor belt

65

Vortex Attractor

100

Flatbed sheet punching and / or embossing machine (punching machine)

200

press

300

folding machine

a

Alignment and transfer movement

B

Sheet transport direction

e

Sheet transport plane

U

Unterschuppung

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 3609550 A [0003]
• DE 19601470 B4 [0004]
• EP 2385007 A2 [0010, 0030]

Claims (10)

Sheet feeder ( 1 ) for a sheet-processing machine, in particular printing machine ( 200 ), Punching machine ( 100 ) or folding machine ( 300 ) for shingling sheets ( 6 ), in particular of paper, cardboard or plastic, with a stack of sheets ( 13 ) for receiving a stack ( 6.1 ) of sheets ( 6 ) and with a suction and transport device ( 60 ) for separating a top sheet ( 6 ) from the stack ( 6.1 ) by suction, holding the sheet ( 6 ) by means of suction air and transport (a) of the sheet ( 6 ), characterized in that the sheet feeder ( 1 ) a boom detection unit ( 61 . 62 ) for detecting at least one edge ( 6.2 . 6.3 ) of the uppermost sheet ( 6 ), at least one trade mark ( 6.4 ) on the topmost sheet ( 6 ) or at least one edge in the printed image ( 6.4 ) of the uppermost sheet ( 6 ) and a control unit ( 15 ) for controlling at least the suction and transport unit ( 60 ), wherein the boom detection unit ( 61 . 62 ) and the suction and transport unit ( 60 ) substantially above the stack ( 6.1 ) and wherein at least the suction and transport unit ( 60 ) and the boom detection unit ( 61 . 62 ) in terms of data transmission with the control unit ( 15 ) and wherein the suction and transport unit ( 60 ) is controllable such that an unterschuppter sheet flow with a defined Unterschuppung (U) is generated. Sheet feeder according to one of the preceding claims, characterized in that the sheet detection unit ( 61 . 62 ) at least one light sensor ( 61 ) sensor for detecting at least the trailing edge ( 6.2 ) of the uppermost sheet ( 6 ) having. Sheet feeder according to one of the preceding claims, characterized in that the suction and transport unit ( 60 ) has driven suction belts or at least one driven suction wheel. Sheet feeder according to one of claims 1-2, characterized in that the suction and transport unit ( 60 ) at least one unit comprising a nozzle for generating a negative pressure by means of a whirlwind, in particular designed as a vortex attractor ( 65 ), and at least one below the nozzle ( 65 ) arranged circulating, driven conveyor belt ( 64 ) owns. Sheet feeder according to one of the preceding claims, characterized in that in the machine control ( 15 ) a Untershuppungsgrad (U) is deposited or can be entered. Method for separating sheets ( 6 ) in particular of paper, cardboard or plastic from a stack ( 6.1 ) and providing for a sheet-processing machine, in particular printing machine ( 200 ), Punching machine ( 100 ) or folding machine ( 300 ) in a submerged arc stream, in particular with a sheet feeder ( 1 ) according to one of the preceding claims, comprising the following steps: a) aspiration of an uppermost sheet ( 6 ) from the stack ( 6.1 ) by a suction and transport unit ( 60 ) b) measuring the sheet position, in particular the sheet trailing edge ( 6.2 ), by a boom detection unit ( 61 . 62 ) c) control of transport elements ( 64 ) of the suction and transport unit ( 60 ) depending on the measurement result in step b) for transporting the sheet ( 6 ) and for transfer into a submerged arc stream d) repetition of steps a) to c) for a respectively next uppermost arc ( 6 ). Method according to claim 6, characterized in that the transport elements ( 64 ) are driven with a fixed velocity profile, the starting time being calculated as a function of the measurement result of b). A method of separating sheets according to claim 6; characterized in that the transport elements ( 64 ) are controlled with an individual velocity profile, which is calculated as a function of the measurement result of b). Method for separating sheets according to one of claims 6 to 8, characterized in that in step b) the sheet position in the transport direction (T) and / or transversely to the transport direction (T) and / or a rotation of the sheet are measured and in step c ) the transport elements ( 64 ) imprint on the sheet an alignment movement (a) in the transport direction (T) and / or obliquely to the transport direction (T) and / or transversely to the transport direction (T). Method for separating sheets ( 6 ), in particular of paper, cardboard or plastic from a stack ( 6.1 ) and providing for a sheet-processing machine, in particular printing machine ( 200 ), Punching machine ( 100 ) or folding machine ( 300 ) in a submerged arc stream with the following steps: a) aspiration of an uppermost sheet ( 6 ) from the stack ( 6.1 ) by a suction and transport unit ( 60 ) b) determining the time at which the sheet ( 6 ) is safely sucked in c) control of transport elements ( 64 ) of the suction and transport unit ( 60 ) depending on the time determined in b) for transporting the sheet ( 6 ) and for transfer into a submerged arc stream d) repetition of steps a) to c) for a respective next uppermost arc ( 6 ).

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