DE102011116365A1 - Sheet processing machine with sheet feeder with suction belt module - Google Patents

Abstract

The invention relates to a sheet processing machine (100) with a sheet feeder (1), an alignment table (2) and at least one processing station (3), wherein the alignment table (2) comprises a suction belt module (24) with at least one circulating suction belt (20) for transporting Sheet (B) having a bow speed (v), and wherein the processing station (3) has at least one rotary tool (31, 32) for processing the sheets (B). The alignment table (2) according to the invention has a first measuring device (50) for determining the bow speed (v) and the processing station (3) a second measuring device (60) for determining the peripheral speed (ω) of the at least one rotary tool (31, 32). First and second measuring device (50, 60) and Saugbandmodul (24) are connected to a control computer (4), so that the bow speed (v) can be adjusted automatically.

Description

The invention relates to a sheet processing machine with sheet feeder with Saugbandmodul according to claim 1.

State of the art

A transport device for conveying and simultaneously aligning sheet material is from the DE 34 10 029 known. The slightly slanted against the straightedge conveyor belt is provided with a plurality of openings, which are arranged above a suction opening open to the openings. The sheet-shaped material placed on the conveyor belt is held on the conveyor belt by the generated suction effect and transported to the leveling bar in order to precisely align it for the subsequent further processing steps.

Another generic device is from the DE 44 21 918 known. There it is provided that the conveyor belt has on its bow-carrying upper side at least on the straight edge facing the transverse groove open transverse grooves, that the upper run of the conveyor belt runs in an open-top guide channel whose top is at the same height as the top of the conveyor belt, and the open side of the transverse grooves is in fluid communication with the air intake device.

The DE 10 2004 022 141 A1 describes a device for conveying and simultaneously aligning sheets, with a straightedge and at least one in the sheet running direction slightly inclined to the directional ruler facing arranged conveyor belt and an air intake, said conveyor belt has open transverse grooves on its top carrying the sheet. The upper run of the conveyor belt runs in an open-top guide channel and the transverse grooves are in fluid communication with the air intake means, with control means being provided for controlling the air supply in the region of the transverse grooves.

In the folding machines known from the prior art, the speeds of circulating belts of a feed table and first folding rollers or upstream cutter shafts are in a fixed relationship to one another. This is due to a constant mechanical coupling of the respective units with a common drive. In order to achieve a good folding quality of the products, it is important that when transferring the sheet from the alignment table to the first pocket folder or its upstream cutter shafts, the speed of the sheet is equal to the speed of rotation of the rotary tools, i. H. the folding rollers or the upstream cutter shafts. This is achieved according to the prior art so that the running speed of the conveyor belts of the alignment table due to a corresponding gear ratio is always greater than the rotational speed of the rotary tools. In order to match the actual speed of the sheets on the conveyor belts to the rotational speed of the rotary tools, the slip between the sheets and the conveyor belts is varied. The slip is dependent on the frictional force between the conveyor belt and the sheet and results inter alia from the sheet format, the weight of the sheet, the nature of the surface, the normal force on the sheet, etc. To the effective slip and thus the actual Adjusting the speed of the sheet on the conveyor belts usually changes the normal force by varying the number of hold-down balls or, in the case of suction belts, by varying the suction force of the air intake device. These settings require a great deal of experience of the machine operator, since he experiences no support from the machine or the machine control during the adjustment work.

task

The object of the present invention is therefore to further develop a sheet processing machine with a sheet feeder with suction belt module so that the adaptation of the sheet-actual speed in the area of the sheet feeder is substantially simplified.

This object is achieved by a sheet processing machine having the features of claim 1.

The sheet processing machine according to the invention has a sheet feeder with an alignment table and further at least one processing station, wherein the sheet feeder is used for separating sheets. Singling means that the sheets are unstacked to be spaced or transported in a scale flow can. The alignment table has at least one Saugbandmodul with at least one circulating suction belt for transporting the sheet at a bow-actual speed.

The processing station has at least one rotary tool for processing the sheets. If the sheet processing machine is a sheet folding machine, the rotary tools are preferably designed as folding rollers or upstream cutter shafts.

According to the invention, the alignment table has a first measuring device for determining the actual speed of the sheet (or in alternative Notation: Bogenistgeschwindigkeit) and the processing station, a second measuring device for determining the circumferential or rotational speed of the at least one rotary tool. If the rotational speed or a rotational speed is determined by the second measuring device, then the peripheral speed of the rotary tool is calculated on its effective surface. Both the first measuring device and the second measuring device and the suction belt module are connected to a computer, which comprises an evaluation unit and the machine control.

According to a first variant of the sheet processing machine according to the invention, the result of the speed measurements is shown: the sheet processing machine has associated with the control computer display / display either for displaying Bogenistgeschwindigkeit and circumferential or rotational speed or to display the difference between Bogenistgeschwindigkeit and peripheral or rotational speed , Based on this display, the machine operator can vary the actual bow speed by means of an operating element of the sheet-processing machine in such a way that the speed difference is remedied, eg. B. by varying the suction of the Saugbandmoduls.

Advantageously, according to a second variant of the invention, the suction belt module is controlled by the computer such that the actual arc speed and the peripheral speed of the at least one rotary tool are approximately equal. This is achieved by changing the suction force of the suction belt module and thus the effective slip between the suction belt and a respective sheet. Such a sheet processing machine has the advantage that the adaptation of the sheet-speed can be performed automatically without adding to the machine operator. If the running speed of the sheet processing machine changes, the suction force of the suction belt module is automatically readjusted. The control loop comprises the activation of the suction belt module (control computer) and the two measuring devices.

In an advantageous embodiment of the sheet processing machine according to the invention, the second measuring device is designed as a rotary encoder and the first measuring device is arranged only in the outlet region of the alignment table. Outlet area of the alignment table means the downstream area of the alignment table, so that the actual speed of a sheet can be measured just before the sheet is transferred from the alignment table to the processing station. The actual sheet speed is therefore determined in the outlet region of the alignment table, since the speed changes only insignificantly until the transfer to the rotary tool.

In a particularly advantageous and therefore preferred embodiment, the first measuring device has at least one optical sensor. This is suitable to detect the actual arc speed. In one embodiment, the first measuring device has two sensors, which are arranged on an axis parallel to the transport direction at a distance of 200 to 300 mm, in particular of about 250 mm to each other. The sensors have the ability to detect the passage of sheet edges. Due to the time span between the detection of a sheet edge by the upstream sensor and the downstream sensor and the known distance between the two sensors, the actual sheet speed can be determined directly.

In an advantageous development of the sheet-processing machine, the latter has a data memory for order-related storage of operating parameters of the suction belt, wherein in particular the effective suction force or the activation parameters can be stored to achieve a required suction force. The values stored in the data memory can be retrieved for repeat jobs, so that the last empirical values are taken into account at startup.

In order to ensure a simple construction of the sheet processing machine, the alignment table and the processing unit each have a drive unit, which is in each case mechanically coupled to a main drive of the sheet processing machine.

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 advantageous embodiments of the invention, reference is made to the dependent claims and the description of an embodiment with reference to the accompanying drawings.

embodiment

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

1a and b is a prior art sheet folder

2a a view of a folding machine according to the invention

2 B a plan view of the folding machine according to the invention of 2a

The 1a and 1b show a folding machine 100 as known in the art. The folding machine 100 has a sheet feeder 1 , an alignment table 2 , a processing station 3 and a machine control with computer 4 on. The sheet feeder 1 causes a separation of sheet B from a sheet stack S, including a vacuum cleaner 11 (Tremat) at the trailing edge of the stack S by means of blowing air and lifting sucker a sheet B from the stack separates and lifts, which then by a suction wheel 10 to the alignment table 2 can be handed over. The alignment table 2 has a variety of guide rails 23 on which a respective sheet B rests during its transport in the sheet transport direction T. During transport via the alignment table 2 becomes a respective sheet B from the conveyor belt 20 , which runs slightly obliquely to the sheet transport direction T, against an alignment ruler 21 transported and aligned. To prevent lifting of a respective sheet B and to ensure that a respective sheet B in contact with the conveyor belt 20 remains is a variety of hold-down balls 22 intended. An aligned sheet B is subsequently to the processing station 3 , shown here as the first folding station, passed.

The folding station 3 has upstream knife shafts 30 , first folding rollers 31 , second folding rollers 32 and folding pockets 33 , In the presentation of the 1a and 1b set the upstream cutter shafts 30 a first rotary tool of the processing station.

Owns the folding station 3 no upstream cutter shafts 30 Thus, the first rotary tool becomes the processing station 3 through the folding rollers 31 educated.

In the 2a and 2 B an inventive sheet processing machine is shown, which is designed here as a folding machine. The folding machine 100 also includes a sheet feeder 1 , an alignment table 2 , a processing station 3 - executed as a first folding station - and a machine control with computer 4 , The by the sheet feeder 1 from a sheet stack S isolated sheet B are about an alignment table 2 the folding station 3 fed. The alignment table 2 has a suction belt module for this purpose 24 which is a vacuum pump 25 and a suction band 20 includes. A respective sheet B is during its transport in the sheet transport direction T through the suction belt 20 sucked and so against an alignment ruler 21 moved and aligned.

In the outlet area of the alignment table 2 are two sensors 51 and 52 arranged, which together the first measuring device 50 form. The downstream sensor 52 is from the upstream sensor 51 spaced apart, wherein the distance is d.

The sensors 51 and 52 are with the machine control 4 connected to the investor 1 , the alignment table 2 and the processing station 3 controls. Through the first measuring device 50 the actual speed v of a respective sheet B is determined in the outlet region of the alignment table. A second measuring device 60 is in the processing station 3 provided and serves to determine the peripheral speed of the first rotary tool 30 respectively. 31 , The second measuring device 60 is also with the machine control 4 connected. Is through the second measuring device 60 not directly the peripheral speed on the active element of a respective rotary tool 30 respectively. 31 measured, this is, based on the measured rotational speed ω and the rotational speed by the machine control 4 calculated. In the machine control 4 Then, a comparison of measured actual arc speed v and peripheral speed ω. If the two velocities v, ω do not match, the actual speed of the sheet v is changed by the machine control by applying the effective normal force to an arc B in the region of the suction belt 20 is adjusted. In other words, by adjusting the suction force of the suction belt module 24 is the slip between suction band 20 and bow B adapted. If there is too little actual arc speed v, the suction force is increased, if too high actual arc speed v is present, the suction force is reduced. Is the running speed of the sheet folding machine 100 changed, there is an automatic adjustment of the actual sheet speed v to the changed rotational speed ω of the rotary tools 30 . 31 , The parameters for controlling the suction belt module 24 can in a data store 40 the machine control 4 be stored.

LIST OF REFERENCE NUMBERS

1

sheet feeder

2

alignment table

3

processing station

4

Machine control with computer

10

suction wheel

11

Vacuum cleaner (Tremat)

12

vacuum pump

13

compressor

14

page blowers

20

conveyor belt

21

aligning gauge

22

Hold balls

23

guide rails

24

Saugbandmodul

25

vacuum pump

30

Rotary tool (upstream cutter shafts)

31

Rotary tool (folding rollers)

32

folding rollers

33

folding pocket

40

data storage

50

1st measuring device

51

upstream sensor

52

downstream sensor

60

2. Measuring device / rotary encoder

100

Sheet processing machine (folding machine)

B

single sheet

S

sheet pile

T

transport direction

d

distance

v

bow speed

ω

Rotational speed / wind speed

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 3410029 [0002]
• DE 4421918 [0003]
• DE 102004022141 A1 [0004]

Claims (10)

Sheet processing machine ( 100 ) with a sheet feeder ( 1 ), an alignment table ( 2 ) and at least one processing station ( 3 ), the sheet feeder ( 1 ) the separation of sheet (B), wherein the alignment table ( 2 ) a suction belt module ( 24 ) with at least one circulating suction belt ( 20 ) for transporting the sheets (B) at a bowing speed (v) and wherein the processing station ( 3 ) at least one rotary tool ( 31 . 32 ) for processing the sheets (B), characterized in that the alignment table ( 2 ) a first measuring device ( 50 ) for determining the bow speed (v) and the processing station ( 3 ) a second measuring device ( 60 ) for determining the circumferential or rotational speed (ω) of the at least one rotary tool ( 31 . 32 ) and that at least first and second measuring device ( 50 . 60 ) and suction belt module ( 24 ) with a control computer ( 4 ) are connected. Sheet-processing machine according to claim 1, characterized in that the sheet-processing machine ( 100 ) one with a control computer ( 4 display) for displaying actual bowing speed (v) and circumferential speed (ω) or for indicating the difference between bowing speed (v) and circumferential speed (ω) and that the sheet processing machine ( 100 ) has an operating element for varying the actual bow speed (v). Sheet processing machine according to claim 1, characterized in that the suction belt module ( 24 ) from the computer ( 4 ) that the actual bow speed (v) and the peripheral speed (ω) of the at least one rotary tool ( 30 . 31 ) are about the same size. Sheet processing machine according to claim 3, characterized in that the suction force of the suction belt module ( 24 ), and thus the slip between the suction belt ( 20 ) and a respective arc (B) is changed. Sheet processing machine according to one of the preceding claims, characterized in that the first measuring device ( 50 ) in the outlet area of the alignment table ( 2 ) is arranged and / or that the second measuring device ( 60 ) is designed as a rotary encoder. Sheet processing machine according to one of the preceding claims, characterized in that the first measuring device ( 50 ) via at least one optical sensor ( 51 . 52 ). Sheet processing machine according to one of the preceding claims, characterized in that the first measuring device ( 50 ) via two sensors ( 51 . 52 ), which are arranged on an axis parallel to the transport direction (T) at a distance (d) of 200 to 300 mm, in particular of about 250 mm, to each other. Sheet processing machine according to one of the preceding claims, characterized in that the sheet-processing machine ( 100 ) a data memory ( 40 ) has for the order-related storage of operating parameters of the intake module ( 24 ), in particular the suction force. Sheet processing machine according to one of the preceding claims, characterized in that the alignment table ( 2 ) and the processing station ( 3 ) each have a drive unit which mechanically with a main drive of the sheet processing machine ( 100 ) is coupled. Sheet processing machine according to one of the preceding claims, characterized in that the sheet-processing machine ( 100 ) is designed as a sheet folding machine and / or that it is in the at least one rotary tool to folding rollers ( 31 ) or upstream cutter shafts ( 30 ).

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