DE102013008298A1 - Transportation device for use in sheet feeder for e.g. sheet punching machine for transporting sheet in sheet transport plane, has transport element arranged on side of transport plane, and pressing element designed as tape-shaped element - Google Patents

Abstract

The device has a driven transport element (41) arranged on a side of a sheet transport plane (E) and provided with a moved contact surface. A pressing element (42) is arranged opposite to the transport element and on another side of the plane for pressing a sheet on a contact surface, where the sheet is made of paper, cardboard- or plastic material. The pressing element is designed as a radially pretensioned running tape-shaped element e.g. belt and chain. The tape-shaped element comprises multiple links, which are connected with each other, and springs are arranged between the links. The transport element is designed as a transport roller, a conveyor belt and a conveying roller.

Description

The invention relates to a transport device for transporting sheets with the features of claim 1 and a sheet feeder with such a transport device according to claim 9.

State of the art

In printing presses and postpress machines, such as folding machines, bookbinding machines, folding box gluing machines and punching machines, sheets must be transported safely and aligned in the correct position.

In known sheet punching and embossing machines, which are used for punching, breaking, embossing and depositing sheets of paper, cardboard and the same, it is known to feed the sheets from a stack by means of an investor of the machine and by means of gripper carriage through the individual stations Machine to move. Grippers are attached to the gripper carriage, gripping the arches at a front end, the gripper carriages themselves being moved through the machine on endless chains. This type of movement of the sheets through the machine enables continuous operation in the individual successively arranged stations of the machine.

Such a flat bed punch is for example from the DE 30 44 083 A1 and the US 7,658,378 B2 known. The two tables are equipped with cutting and scoring tools or corresponding counter tools with which punched out of the cyclically guided between the table surface sheets the benefits and at the same time pressed the necessary for clean folding grooves. In the subsequent breakout the waste is removed by machine tools. Depending on the equipment of the machine finally the punched benefits can be separated in a designated Nutzentrenneinrichtung.

In order to achieve a high product quality of the punched sheets, it is necessary that the sheets and tools are precisely aligned with each other. This requires both an alignment of the bow and the tools. The register describes the positional accuracy of the printed image at the cutting, creasing and breaking edges of the sheet. A distinction is made between circumferential grip, d. H. the positional accuracy in the machine direction and side registration, d. H. the positional accuracy transverse to the machine direction.

In the punching station of a sheet punching and embossing machine, the punching tool and punched riddle plate must be brought to an exact position in the circumferential direction. It must also be ensured that both tools are directly perpendicular to the sheet transport direction without skewing. This reference position is called "first knife". In the subsequent processing stations, the tools must be adjusted relative to the position of the first knife, such. B. the stripping board in the breaker and the Nutzentrenngitter in the Nutzentrennstation. The tools must be set in their three degrees of freedom. During operation of the sheet punching and embossing machine, it may be necessary to readjust the position of the tools in the punching station. The tools in the subsequent processing stations must also be readjusted to bring them back into the correct position relative to the "first knife". The terms "aligning", "positioning" and "correcting the position" of an arc are used interchangeably below.

From the prior art various measuring devices are known, which are preceded by the accurate register alignment of a sheet:
The DE OS 25 20 232 describes a device for transferring sheets to a sheet processing machine. In this case, in the area of a feed table, a mark printed on the sheet, a so-called print mark, or a side edge of the sheet is detected by sensors and the feed table is moved transversely to the sheet transport direction so that the sheet in its correct, side-facing position to the sheet transport system of the sheet processing machine can be handed over.

The DE 10 2008 012 775 A1 relates to a method for measuring the position of a sheet in the feeder of a printing or post-processing machine, wherein the measurement of the position of the sheet on the measurement of the position of the sheet leading edge or the location of printed on the sheet marks by means of a sensor. Furthermore, the invention relates to a method for aligning the sheet based on the measurement results.

This elaborate adjustment work of the tools and the alignment of the sheets ensures that the sheets are processed accurately.

Numerous transporters for sheets are known from the prior art, which feed sheet in particular from a sheet feeder to a subsequent sheet-processing machine. In addition to the pure transport movement can also be an orientation of the sheet in the transport direction, transverse to the transport direction and obliquely to the transport direction during the feeding process, so that a respective arc in aligned state of a first processing station of the sheet-processing machine is supplied.

To ensure that the sheets rest well on the transport elements during transport and thus a defined sheet transport is ensured, for example, as in the DE 34 10 029 C1 or the DE 10 2004 022 141 A1 described suction belts used. The suction belts are conveyor belts on which the sheets rest and over which an additional suction force is applied to the sheets. Alternatively, pressing elements can be used, as for example in the US 2,190,416 are shown as balls and rollers. These pressing elements are mounted above the transport plane and press a respective sheet on below the transport plane attached transport elements. The disadvantage of this is that the pressing elements can produce markings on the sheet.

task

Object of the present invention is to develop the prior art and to provide a transport device, which at least reduces the disadvantages of the prior art and allows safe, accurate and mark-free sheet transport.

This object is achieved by a transport device having the features of claim 1.

The transport device according to the invention is used for transport and optionally. The position alignment of arcuate elements, in particular of paper, cardboard or plastic in a sheet transport plane and has at least one on one side of the sheet transport plane, z. B. below, arranged in particular driven transport element with a moving, z. B. circumferential contact surface and at least one on the other side of the sheet transport plane, z. B. above, and arranged opposite to the transport element another element for pressing the arcuate elements on the contact surface. This pressing element is designed according to the invention as a radially biased, follower endless belt-shaped member. The band-shaped member may be a band, a belt or a chain. Radial bias means a bias of the band-shaped member which has a closed, annular or circular shape in its radial direction. Such an embodiment of the transport device makes it possible to transport the sheets safely and to be able to align exactly in their position. This is due to the fact that for a secure guidance of the sheet no high surface pressure is required. The pressing of a respective arc on the moving contact surface of the driven transport element takes place by lowering the at least one pressing element such that the band-shaped member is brought into contact with a sheet or the contact surface and exerts a contact force on a respective sheet. Due to the radial bias of the band-shaped member, it is sufficient to lower the pressing member; An additional contact force does not have to be applied. Another advantage of the radial bias of the tape-shaped member is that the bearings of the band-shaped member can be designed as a simple low-friction bearings, since these must be able to absorb only a relatively small bearing forces and on the other hand, the friction between the band-shaped member and the bearing is relatively low, as no high tension must be generated in the tape-shaped member by stretching the tape-shaped member.

In an advantageous embodiment of the transport device according to the invention, the band-shaped member has a plurality of interconnected individual members, wherein the members extend axially and wherein a respective member is supported relative to its respective adjacent member. By axial extent of the links is to be understood that only the juxtaposition of the respective links form the band-shaped organ. The support between the respective adjacent members is designed such that the individual members are braced against each other and the band-shaped member has a total of a radial bias.

In a first embodiment, the band-shaped member has a plurality of springs, wherein the springs are each arranged between the members and cause the radial bias of the band-shaped member. One possible embodiment is that of a link chain with springs. In a second embodiment variant, the band-shaped member is designed as a composite band and has a closed band as a support structure and applied thereto, provided with notches coat. The notches are axially aligned and introduced into the surface of the shell, wherein the closed band causes the radial bias of the band-shaped member. The support structure may be embodied, for example, as a steel tensile carrier or as a polyamide tape. The notches of the shell can also be referred to as slots or slits and are particularly evenly distributed around the circumference of the shell. The jacket can be made in particular of a plastic. This embodiment variant is considered to be particularly advantageous since it is easy to manufacture and inexpensive to manufacture.

In an advantageous embodiment of the transport device according to the invention, the at least one pressing element has two deflection rollers for guiding the band-shaped member, wherein the deflection rollers are designed in particular as deflection rollers or sprockets. The pulleys allow on the one hand a length compensation of the band-shaped member, when the pressing member is employed against the contact surface of the transport element, as well as an easily accessible circulation of the band-shaped member, when this is moved with the moving contact surface of the driven transport element.

In a first embodiment, the at least one transport element is designed as a transport roller and the contact surface is formed by the lateral surface of the transport roller. In a second embodiment, the at least one transport element is designed as a conveyor belt and the contact surface is formed by the upper run of the conveyor belt. Both embodiments are considered to be advantageous because it provides continuous circumferential contact surfaces and the transport element does not have to be moved back to each transport movement of a sheet in an initial position.

The invention also relates to a sheet feeder according to claim 9 for singulating and feeding sheets to a sheet-working machine having a transport means as described above.

The described invention and the described advantageous developments of the invention are also in any combination with each other advantageous developments of the invention.

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 punching machine with inventive transport device

2a and b Transport and alignment of a bow

3a and b, the pressing member in a first embodiment in the pretensioned state and in function

4a and b detailed representations of the pressing element from the 3a and b

5a and b, the pressing element in a second embodiment in a prestressed state and in function

6a , b, c different embodiments of the transport element Corresponding elements and components are provided in the figures with the same reference numerals.

In 1 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 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 stack through a so-called suction head 18 isolated, via a feed table 16 with a transport device 40 with transport element 41 and pressing element 42 the sheet transport system 7 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. 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 or in an alternative embodiment by an electromagnetic linear drive with traveling wave motors, such as in the DE 20 2007 012 349 U1 and the US 7,735,824 B2 described.

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 with punching and creasing knives Mistake. 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.

2a shows the transport device according to the invention 40 , The transport device 40 has a arranged below the sheet transport plane E driven transport element 41 on. In the example of 2a this is designed as a conveyor belt 41.2 , Above the sheet transport plane E is a pressing element 42 arranged. The pressing element 42 has a band-shaped organ 42.1 , which on pulleys 45 is stored and shown in more detail in the following figures and described in more detail below. The driven transport element 41 and the pressing element 42 work together to get one on the feed table 16 transported bow 6 continue to transport in the sheet transport direction B and thereby align if necessary. Target by the transport device 40 an alignment of the bow 6 done, so can sensors 101 . 202 for circumferential, oblique and lateral position measurement of the arch 16 be provided. To make a bow 6 between the driven transport element 41 and the pressing element 42 to clamp and guide defined, has the transport device 40 An institution 46 for lowering the contact pressure element 42 , The lowering movement is represented by a double arrow. Aligning a respective arc 6 happens through the interaction of driven transport element 41 and pressing element 42 : so on the one hand on the control of the drive of the transport element 41 its movement and on the other by controlling the drive of the device 42 for lowering the contact pressure element 42 Contact time and contact time of the contact pressure element 42 varied. Such an aligned bow 6 can then - as in 2 B shown - to a subsequent sheet transport system 7 , For example, a gripper track or a gripper drum, are passed. At the latest when the delivery of a respective bow 6 to the sheet transport system 7 is done, the pressing element 42 from the institution 46 raised again to lower and the respective bow 6 thus released.

In the 3a and 3b is a first embodiment of the pressing element 42 shown. The band-shaped organ 42.1 is here as a chain 42.3 with a variety of chain links 43.1 executed. The chain 42.3 is self-contained and on two sprockets 45.1 stored. Even if the pressure element 42 does not have its own drive to the chain 42.3 To impart a rotational movement is thus enabled that the chain of the arranged below the sheet running plane E driven transport element 41 can be moved. In the presentation of 3a is the pressing element 42 in a non-lowered state, thus inoperative, and does not interact with the driven transport element 41 together. It is clear that the chain 42.3 the sprockets 45.1 does not loop loosely, but rather is under a radial bias V. The radial bias V causes the chain to expand 42.3 what about the "bellies" of the chain 42.3 between the sprockets 45.1 can be seen. Will the pressure element 42 now lowered, so this with the driven transport element 41 can work together, so the situation arises, as in 3b is shown. The preloaded chain 42.3 causes a contact force F, which of a bow 6 and the arranged below the sheet transport plane E driven transport element 41 (both not shown here) is recorded. The lowering movement makes the chain 42.3 loaded, goes into an extended position and exerts a clamping force F on the transport surface of the transport element 41 out. In other words, the chain 42.3 presses with her "lower belly" a respective bow 6 against the contact surface of the driven transport element 41 ,

The construction of the chain 42.3 is in the 4a and 4b shown in more detail. 4a shows a first embodiment, according to the chain 42.3 from a variety of chain links 43.1 consists. In a respective chain link 43.1 is a spring element 43.2 integrated, which is connected to a stop 43.3 an adjacent chain link 43.1 supported. The further the chain 42.3 is spent in its extended position, the greater the force of a respective spring element 43.2 so that the bias voltage V is increased. In an alternative and in 4b embodiment shown are the springs 43.2 not in the chain links 43.1 integrated, but each as a separate compression springs 43.2 executed. Alternatively, torsion springs, torsion springs or leaf springs can be used. In addition, damping elements can be parallel or in series with the spring elements 43.2 be used to effect a damping with changing power transmission.

In the 5a and 5b is an alternative embodiment of the pressing element 42 shown. The band-shaped organ 42.1 is here as a composite tape or belt 42.2 executed. This band 42.2 has a closed support structure 44.1 and a coat applied to it 44.2 , At the circumference of the coat 44.2 are notches 44.3 brought in. 5a shows a pressing element 42 in unassembled condition. If the tape 42.2 on two guide rollers 45.2 is mounted, the situation arises as shown by 5b , The scores 44.3 of the coat 44.2 be spread wide and the band 42.2 is under a bias voltage V. The amount of bias can be determined by the modulus of elasticity of the materials used, by the notch shape of the notches 44.3 in the coat 44.2 as well as by the distance of the guide rollers 45.2 to be influenced. This embodiment of the contact pressure element 42 can analogous to the embodiment with chain 42.3 and, as based on the 3a and 3b described, are used. By the lowering movement of the contact pressure element 42 becomes the band 44.2 loaded, goes into an extended position and thus exerts a clamping force on the contact surface of the transport element.

In the 6a . 6b and 6c Different embodiments of the driven transport element are shown. According to a first, in 6a illustrated embodiment, has the driven transport element 41 two independently drivable conveyor belts 41.2 , According to a second, in 6b illustrated embodiment, has the driven transport element 41 two independently driven transport rollers 41.3 , According to a third, in 6c illustrated embodiment, has the driven transport element 41 a driven transport roller 41.1 , By appropriate control of the drives of the transport elements 41 can a bow 6 be transported in the sheet transport direction B and aligned if necessary.

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

7

Sheet transport system

8th

Gripper carriage with grippers

9

Lower table / lower crucible

10

Upper table / upper crucible

11

trimmings

12

container

13

palette

14

delivery pile

15

Control with interface and input devices

16

Feed table with a unit for aligning the bow

17

main drive

18

suction head

20

lower tool

21

Upper tool with punches

23

Dividing grille or stripping board (lower tool)

30

Upper tool (punching tool)

40

transport means

41

driven transport element

41.1

transport roller

41.2

conveyor belt

41.3

transport roller

42

presser

42.1

Band-shaped organ

42.2

Tape / tape

42.3

Chain

43.1

link

43.2

feather

43.3

attack

44.1

supporting structure

44.2

coat

44.3

score

45

idler pulley

45.1

Sprocket

45.2

deflecting

46

Device for lowering the contact pressure element

100

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

101, 102

Sensors for circumferential, oblique u. page survey

B

Sheet transport direction

e

Sheet transport plane

F

backpressure

V

preload

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 3044083 A1 [0004]
• US 7658378 B2 [0004]
• DE 2520232 A [0007]
• DE 102008012775 A1 [0008]
• DE 3410029 C1 [0011]
• DE 102004022141 A1 [0011]
• US 2190416 [0011]
• DE 202007012349 U1 [0030]
• US 7735824 B2 [0030]

Claims (9)

Transport device ( 40 ) for transport and / or position alignment of sheets ( 6 ) in particular of paper, cardboard or plastic in a sheet transport plane (E) with at least one on one side of the sheet transport plane (E) arranged transport element ( 41 ) with a moving contact surface and at least one on the other side of the sheet transport plane (E) and with respect to the transport element ( 41 ) arranged pressing element ( 42 ) for pressing the sheet ( 6 ) to the contact surface, characterized in that the at least one pressing element ( 42 ) as a radially biased, revolving band-shaped member ( 42.1 ) is executed. Transport device according to claim 1, characterized in that the band-shaped member ( 42.1 ) as a band, strap ( 42.2 ) or chain ( 42.3 ) is executed. Transport device according to one of the preceding claims, characterized in that the band-shaped member ( 42.1 ) having a plurality of interconnected links, said links extending axially and having a respective member supported against its adjacent links. Transport device according to claim 3, characterized in that the band-shaped member ( 42.3 ) a variety of springs ( 43.2 ), the springs ( 43.2 ) between the links ( 43.1 ) are arranged and the radial bias (V) of the band-shaped member ( 42.3 ) cause. Transport device according to claim 3, characterized in that the band-shaped member ( 42.2 ) a closed band as a supporting structure ( 44.1 ) and an applied, with notches ( 44.3 ) provided jacket ( 44.2 ), wherein the notches ( 44.3 ) and axially into the surface of the shell ( 44.2 ) and wherein the closed band ( 44.2 ) the radial prestress (V) of the band-shaped member ( 42.2 ) causes. Transport device according to one of the preceding claims, characterized in that the at least one pressing element ( 42 ) two pulleys ( 45 ) has for guiding the band-shaped member ( 42.1 ), wherein the pulleys ( 45 ) in particular as deflection rollers ( 45.2 ) or as sprockets ( 45.1 ) are executed. Transport device according to one of the preceding claims, characterized in that the at least one transport element ( 41 ) as a transport roller ( 41.1 ) or as a transport roller ( 41.3 ) Is executed and the contact surface is formed by the lateral surface of the transport roller or the transport roller. Transport device according to one of claims 1-6, characterized in that the at least one transport element ( 41 ) as a conveyor belt ( 41.2 ) is executed and the contact surface is formed by the upper run of the conveyor belt. Sheet feeder ( 2 ) for a sheet-processing machine ( 100 ), in particular sheet-punching and / or embossing machine, sheet-fed press or sheet-folding machine, with a transport device ( 40 ) according to one of the preceding claims.

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