ES2982952T3 - Device and method for feeding flat goods into a machining unit - Google Patents

Abstract

The invention relates to a device for feeding sheet products (02) to a processing unit (50) in a conveying plane, in particular for feeding panels (02) to a printing and/or varnishing unit of a coating machine or the like, in which the sheet products (02) are transported in a lying position in a row by means of a conveying device (01), in which the conveying device (01) has a first conveying device (10) with a guide forming the conveying plane for the sheet products (02) and at least one circumferential conveying stop (18), in which the conveying stop (18) acts on the trailing edge (03) of a respective sheet product (02) guided in the conveying plane and in which the first conveying device (10) is associated with a sensor (41) which is designed to detect the actual position of the trailing edge (03) of the respective sheet product (02) guided in the conveying plane and is connected to an evaluation device, where the evaluation device is used to compare the detected actual position with a target position. represented by the position of the at least one rotating transport stop (18). (Automatic translation with Google Translate, without legal value)

Description

DESCRIPTION

Device and method for feeding piniform goods to a machining unit

The disclosure relates to a device for feeding pin-shaped goods into a machining unit, wherein the pin-shaped goods are transported one after the other in a lying position and by means of a transport device.

The feeding of flat goods, for example panels, in particular sheet metal panels, into a machining unit, in particular a printing or lacquering unit of a sheet metal coating machine, must take place with positional accuracy in order to achieve satisfactory lacquering or printing results.

For this purpose, it is known to perform a mechanical alignment of the panels using lateral marks, positioning marks, panel stops or similar.

Panels transported one after the other in a horizontal position collide with positioning marks or stops during transport, forcing the panels into the desired or required position. Finally, optimum longitudinal orientation of the panels relative to the transport path is required so that they are fed into the machining process or machining unit at the right time. As the panel thicknesses become increasingly smaller and production speeds are required, damage to the panel edges can often occur with the familiar devices.

When separating and feeding panels from the feeder into the machining unit, the panels have to be transferred with angular precision to ensure smooth, bump-free panel movement, which is ultimately also a prerequisite for good fit accuracy in the machining unit.

The transport of panels to the machining unit by means of friction-dependent transport media is influenced, among other things, by the condition of the transport media, the differential speed between two transport systems, the friction coefficient of the panel underside, the production speed and the inertia of the panels.

Therefore, it may be necessary to readjust the synchronization point between two interacting transport paths.

Currently, readjustment is performed manually and purely visually by the operator on the control panel of a machining unit.

Increasing production speeds allow for smaller fit tolerances. At the same time, at higher speeds, visual detection becomes more difficult for an operator, particularly when the view of the panel web is obstructed by protective covers, double panel ejections or intermediate dryers.

From DE 102007031 115 A1 a device and a method for orienting panel-shaped goods are known, in which circumferential orientation stops are used.

From EP 1008016 B1 an orientation device is known, wherein the lateral edge of a sheet is detected by means of light barriers to determine its position relative to a target printing position.

From DE 102005037128 A1 a transport system of a sheet metal printing or sheet metal lacquering machine is known, in which flat belts are used to transport the panels.

From DE 102012211 783 A1 a transport device and a method for transporting sheets of printing material are known, in which the leading edges of the printing material are oriented against stop surfaces of a cylinder.

Document DE 198 10 112 A1 relates to a device for the clock-synchronised introduction of products fed in any sequence from a pre-machine into a rotary device which detects the products centrally. The rotary device can be moved between a receiving position and a delivery position. The device comprises a transfer conveyor arranged between a feed conveyor and an infeed conveyor. The transfer conveyor is driven by a drive with a slave path sensor, the speed of which can be adjusted by the interaction of the sensor of the feed conveyor and the infeed conveyor.

DE 23 46 407 A describes a device for regulating the feeding of objects into a packaging machine. The device comprises several conveyor belts, at least one of which has drive elements. A sensor detects the passage of individual objects and is designed with a device for changing the conveying speed of one of the conveyor belts as a function of the sensor signals.

Document DE 202005017869 111 discloses a single-use feeder with a transport system featuring a servo drive with register control. Cams are used to orient the individual formats transported via belts.

US 2004/178555 A1 discloses a document collection system. The collection system comprises a box into which collections of documents are pushed in a downstream direction by regularly spaced push fingers. Documents are fed into the box from separate document feeding equipment, collected between the push fingers and wrapped after exiting the box.

A dynamic distance correction for an envelope inserting subsystem is known from EP 1306336 A2. US 2004/080091 A1 shows a mail insertion system with a section for releasing and grouping documents. The mail insertion system has a sensor device which detects the arrival of rotating pusher fingers.

The invention is based on the objective of creating a device for feeding planar goods to a machining unit, which reduces the mechanical load on the planar goods even at high machining speeds and which facilitates in particular an adaptation to changing production conditions.

The object is achieved according to the invention by a device with the features of the independent claims. The dependent claims refer to advantageous configurations and/or improvements of the solution found.

The advantages that can be achieved with the invention consist in particular in that the flat goods are fed with little impact to the machining unit. Another advantage consists in particular in that an operator is helped to detect a deviation from the synchronization point or to eliminate a deviation from the synchronization point or to eliminate a deviation from the synchronization point automatically.

Exemplary embodiments of the invention are shown in the drawings and are described in more detail below. They show:

Figure 1 shows a coating machine with a device for feeding flat goods;

Figure 2 a schematic representation of the device for feeding planar goods to Figure 1 The coating machine shown in Figure 1 can in particular be a lacquering machine and/or a printing machine.

The coating machine is designed for processing flat goods 02 in the form of panels 02.

In the coating machine, for example, panels 02, in particular sheet metal panels, are fed along a transport path in a transport direction 06 with a transport device 01 in a transport plane to one or more processing units 50, in particular printing and/or lacquering units, and are machined on at least one side thereof, for example printed and/or lacquered, in one or more processing units 50. The transport of the planar goods 02, in particular the panels 02, takes place in this case in a non-staggered manner, in a one-after-one arrangement, i.e. individually in a lying position and separated from one another. In order to ensure machining in exact alignment with respect to the longitudinal register, at least one cylinder, which is preferably part of a processing unit 50, can preferably have leading edge orientation means, more preferably leading edge stops, in particular positioning marks, for the exact alignment of the panels 02 transported by the transport device 01.

By interaction of the transport device 01 transporting the planar goods 02, in particular panels 02, with the leading edge orientation means, preferably leading edge stops, in particular positioning marks, of a cylinder, in particular a printing cylinder, the panels 02 can be positioned in exact alignment and correctly oriented.

The transport device 01 has a first transport device 10 with a guide 02 forming the transport plane for the planar goods and at least one circumferential transport stop 18.

The guide can be formed by fixed guide rails, in particular sliding rails, and/or by conveying means 11 which rotate via front and rear diverter wheels 12. Particularly suitable as conveying means 11 are conveying belts 11 which rotate parallel to one another and which can be arranged in pairs. The conveying means 11 grip in particular on the underside of a respective planar goods 02 when it reaches the conveying area of the first conveying device 10. The conveying means 11 transport the planar goods 02 lying thereon at least as far in the conveying direction 06 as the at least one circumferential conveying stop 18 can grip at its rear edge 03.

The at least one circumferential transport stop 18 can be associated with a belt 17 rotating via front and rear diverter wheels 19 or with a chain 17 rotating via front and rear diverter wheels 19. Preferably, several pairs of circumferential transport stops 18 are formed which are spaced from one another transversely to the transport direction 06, the transport stops 18 of each pair cooperating to transport a respective planar goods 02. The transport stops 18 of these pairs are in each case associated with different chains 17 or belts 17.

In the transport direction 06, the distance between the diverter wheels 12 of the transport means 11 is preferably smaller than the distance between the diverter wheels 19 of the belts 17 or chains 17. The distances can also be of the same size.

The conveying means 11 preferably extend only over a partial area, in particular an input area, of the first conveying device 10, whereas the belts 17 or chains 17 extend over the entire length of the first conveying device 10. The conveying means 11 grip the underside of a respective planar goods 02 when it reaches the conveying area of the first conveying device 10. The conveying means 11 transport the planar goods 02 lying thereon at least as far in the conveying direction 06 as the at least one circumferential conveying stop 18 can grip at its rear edge 03.

The guide is designed in the area of a circumferential path of the at least one circumferential transport stop 18. In the area of the first transport device 10, the transport of a respective planar goods 02 is brought about in particular by the at least one circumferential transport stop 18 acting on the rear edge 03 of a respective planar goods 02 guided by the guide in the transport plane and displacing it in the transport direction 06. Therefore, in technical parlance, the at least one circumferential transport stop 18 is also referred to as rear transport.

The first conveying device 10 is preferably followed by a second conveying device 20 in the conveying direction 06. The second conveying device 20 also has a guide and at least one additional circumferential conveying stop 28.

The at least one additional circumferential transport stop 28 is associated with at least one belt 27 rotating through diverter wheels 29 or a chain 27 rotating through diverter wheels 29.

The guide of the conveying device 20 can also be formed by fixed guide rails, in particular sliding rails. The transport of a respective planar goods 02 in the region of the second conveying device 20 is brought about in the same way as in the first conveying device 10. In this case too, a respective planar goods 02 is transported over the rear edge 03 by the biasing action of at least one circumferential transport stop 28.

The first conveying device 10 can be preceded by an additional conveying device 30 in the conveying direction 06. The additional conveying device 30 preferably has circumferential conveying means 31, which can be designed as conveying belts 31 and rotate via diverter wheels 32. The additional conveying device 30 can be arranged behind a feeder or be designed as a feeder or form part of a feeder.

The transfer of a respective flat-shaped goods 02 from the first transport equipment 10 to the second transport equipment 20 must take place absolutely silently and without any impact, since the respective flat-shaped goods 02 are oriented immediately afterwards.

For this purpose, the respective planar product 02 is preferably placed on leading edge orientation means, preferably leading edge stops, in particular positioning marks, of a cylinder. Any unstable movement at this point would have a detrimental effect on the adjustment accuracy. The prerequisite for a collision-free transfer from the first transport device 10 to the second transport device 20 is that the respective planar goods 02 are fed from the additional transport device 30 to the first transport device 10 in the correct position, in particular at the correct time. The position or the time can be achieved by means of a synchronization angle adjustment between the additional transport device 30 and the first transport device 10. If the additional transport device 30 is part of the feeder, the synchronization angle adjustment between the feeder and the first transport device 10 takes place. Since the transport of the respective planar goods 02 from the additional transport device 30 to the first transport device 10 does not take place in a form-fitting manner but in a sliding manner with transport means 31, which are preferably designed as transport belts 31, the transfer between the additional transport device 30 and the first transport device 10 depends on different production states. A synchronization angle correction is therefore required for different production states. A sensor 41 is associated with the first conveying device 10 for detecting the actual position of the rear edge 03 of the respective planar goods 02 guided in the conveying plane. The sensor 41 is connected to an evaluation device. The evaluation device is designed to compare the detected actual position of the rear edge 03 of the respective planar goods 02 guided in the conveying plane with a target position represented by the position of the at least one circumferential conveying stop 18.

The target position can be detected by direct detection of the position of the at least one circumferential transport stop 18 or of a pair of transport stops 18. For this purpose, an additional sensor 42 is associated with the first transport device 10, which is designed to detect the position of the at least one transport stop 18. The first sensor 41 and/or the additional sensor 42 can be designed as light barriers and can detect the position of a respective rear edge 03 or of the at least one transport stop 18, for example via a flank change.

The target position can be detected indirectly, for example by using an angle transducer or an encoder. For this purpose, the first transport device 10 preferably has a drive shaft which drives the at least one transport stop 18 circumferentially, the angle transducer being associated with the drive shaft and generating signals representing the position and/or rotation of the drive shaft and thus the position of the at least one transport stop 18.

The first transport device 10 can also have a drive in which an encoder is integrated or connected, the encoder generating signals representing the position of the transport stop 18.

The evaluation device may be connected to the additional transport equipment 30 arranged in front of the first transport equipment 10 and may be designed to control a transport movement of the additional transport equipment 30 based on the result of the comparison.

In particular, the evaluation device may be designed to control the transport movement of the additional transport equipment 30 by shifting the phase position of the transport movement.

The control of the transport movement of the additional transport equipment 30 is preferably triggered fully automatically by the evaluation device.

By averaging the position over several respective planar goods 02, control fluctuations in the tracking of the synchronization angle due to individual outliers can be avoided.

Preferably, the evaluation device is connected to a display device. The display device is designed to visually display the result of the comparison and displays it visually.

List of references

01 transport device

02 merchandise, planiform, panel

03 rear edge, (02)

04 -05 -06 transport direction

07 -08 -09 -10 transport team, first

11 means of transport, transport belts, circumferential (10)

12 derailleur wheel

13 -14 -15 -16 -17 belt, chain

18 Transport stop, circumferential (10)

19 derailleur wheel

20 transport team, second

21 -22 -23

belt, chain

transport stop, additional

derailleur wheel

transport equipment, additional

conveying means, conveying belts, circumferential (30)

derailleur wheel

sensor

sensor, additional

machining unit

Claims (9)

1. Device for feeding piniform goods (02) in the form of panels to a printing and/or lacquering unit of a coating machine in a conveying plane, wherein the piniform goods (02) are transported one after the other in a lying position by means of a conveying device (01), wherein the conveying device (01) has a first conveying device (10) with a guide forming the conveying plane for the planiform goods (02) and at least one circumferential conveying stop (18), wherein the conveying stop (18) acts on the rear edge (03) of a respective planiform goods (02) guided in the conveying plane, and wherein a sensor (41) is associated with the first conveying device (10), which is designed to detect the actual position of the rear edge (03) of the respective planiform goods (02) guided in the conveying plane and is connected to an evaluation device, wherein the evaluation device is designed to compare the actual position of the rear edge (03) of the respective planiform goods (02) guided in the conveying plane. 1. A conveying device for measuring the transport movement of a further conveying device (30) by shifting the phase position of the transport movement, comprising: a first conveying device (10) is followed by a second conveying device (20) and the second conveying device (20) has at least one additional circumferential transport stop (28), which is associated with at least one belt (27) rotating via diverting wheels (29) or a chain (27) rotating via diverting wheels (29), and the evaluation device is designed to control a transport movement of a further conveying device (30) by shifting the phase position of the transport movement. 2. Device according to claim 1, with a display device that is connected to the evaluation device and designed to visually display the result of the comparison and/or visually displays the result of the comparison. 3. Device according to claim 1 or 2, with an additional transport device (30) arranged in front of the first transport device (10), which is connected to the evaluation device, wherein the evaluation device is designed to control a transport movement of the additional transport device (30) depending on the result of the comparison. 4. Device according to claim 1, 2 or 3, characterized in that the additional transport equipment (30) has circumferential transport means (31) and/or is arranged behind a feeder and/or is designed as a feeder. 5. Device according to claim 1, 2, 3 or 4, characterized in that the guide forming the transport plane is formed by fixed guide rails and/or by transport means (11) rotating through diverter wheels (12). 6. Device according to claim 1, 2, 3, 4 or 5, characterized in that the at least one circumferential transport stop (18) is associated with at least one belt (17) rotating through diverting wheels (19) or with a chain (17) rotating through diverting wheels (19) and the guide is designed in a region of a circumferential path of the at least one circumferential transport stop (18). 7. Device according to claim 1, 2, 3, 4, 5 or 6, characterized in that an additional sensor (42) is associated with the first transport device (10), which is designed to detect the position of the at least one transport stop (18). 8. Device according to claim 1, 2, 3, 4, 5, 6 or 7, characterized in that the first transport device (10) has a drive shaft that drives the at least one transport stop (18) circumferentially, wherein an angle transducer is associated with the drive shaft that generates signals representing the position of the transport stop (18). 9. Device according to claim 1, 2, 3, 4, 5, 6, 7 or 8, characterized in that the first transport device (10) has a drive in which an encoder is integrated or which is connected to an encoder and the encoder generates signals representing the position of the transport stop (18).